KR102709834B1 - Electronic expansion valve - Google Patents

Abstract

The present invention provides an electronic expansion valve (100), and the electronic expansion valve (100) includes a valve body (10), a valve needle assembly (20), a screw rod assembly (30), a rotor assembly (50), a stator assembly, and a sleeve (40). A guide sleeve (16) is installed inside the valve body (10) to guide the valve needle assembly (20) to move, and the valve needle assembly (20) is installed on the guide sleeve (16). The screw rod assembly (30) is connected to the rotor assembly (50), and the stator assembly can act on the rotor assembly (50) to drive the rotor assembly (50) to rotate, and the rotation of the rotor assembly (50) can drive the screw rod assembly (30) to move. A valve port (11) is opened on the valve body (10), the valve needle assembly (20) opens and closes the valve port (11) under the operation of the screw rod assembly (30), and the sleeve (40) is installed to cover one end of the valve body (10) that is far from the valve port (11).

Description

Electronic Expansion Valve {ELECTRONIC EXPANSION VALVE}

This application is a continuation-in-part of the application No. 2018213376030 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213353433 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213375841 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213357716 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213352750 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018109433995 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213357716 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213352750 filed on August 17, 2018, entitled "Electronic Expansion Valve", the application No. 2018213357716 ... "Electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018109434023 filed on the 17th, "Electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018213355354 filed on August 17, 2018, "Electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018109416190 filed on August 17, 2018, "Electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018213352892 filed on August 17, 2018, "Electronic expansion valve and air conditioning system using the electronic expansion valve" of application number 2018109427462 filed on August 17, 2018, This application claims priority to Chinese patent/design application entitled “Electronic expansion valve and air conditioning system using said electronic expansion valve” with application number 201821335213X, which is incorporated herein by reference in its entirety.

The present invention relates to the field of refrigeration technology, and more particularly to an electronic expansion valve.

Electronic expansion valves achieve the purpose of flow regulation and throttle decompression by opening and closing the valve port on the valve body through the movement of the valve stem assembly within the guide sleeve and the nut sleeve, and are widely used in the field of refrigeration equipment technology. The conventional electronic expansion valves are complicated to install, and the reliability and stability of the electronic expansion valves are low.

Based on this, an electronic expansion valve is provided according to various embodiments of the present application.

The technical solution of the present application is as follows.

The electronic expansion valve provided in the present application includes a valve body, a valve needle assembly, a screw rod assembly, a rotor assembly, a stator assembly, and a sleeve. A guide sleeve is installed inside the valve body to guide the valve needle assembly to move, and the valve needle assembly is installed on the guide sleeve. The screw rod assembly is connected to the rotor assembly, and the stator assembly can act on the rotor assembly to drive the rotor assembly to rotate, and the rotation of the rotor assembly can drive the screw rod assembly to move. A valve port is opened on the valve body, and the valve needle assembly opens and closes the valve port under the driving of the screw rod assembly. The sleeve is installed to cover one end of the valve body far from the valve port.

Details of one or more embodiments according to the present application are provided in the accompanying drawings and description below. Other features, objects and advantages of the present application are clearly explained through the description, accompanying drawings and claims. In addition, descriptions corresponding to the original technical effects and advantages are described in the embodiment section.

FIG. 1 is a perspective view of an electronic expansion valve according to one embodiment.
FIG. 2 is a cross-sectional view of an electronic expansion valve according to one embodiment.
FIG. 3 is a perspective view of an electronic expansion valve according to another embodiment.
Fig. 4 is a cross-sectional view of an electronic expansion valve according to Fig. 3.
Figure 5 is a cross-sectional view of a valve body according to one embodiment.
FIG. 6 is a cross-sectional view of a valve body having a second mounting step installed according to one embodiment.
Figure 7 is a cross-sectional view of a valve body according to another embodiment.
FIG. 8 is a cross-sectional view of a valve body having a debris storage structure installed according to one embodiment.
Figure 9 is an enlarged view of B in Figure 8.
Fig. 10 is a cross-sectional view of a valve body having a position limiting member installed according to one embodiment.
Figure 11 is an enlarged view of C in Figure 10.
FIG. 12 is a cross-sectional view of a debris storage structure according to another embodiment.
Figure 13 is an enlarged view of D in Figure 12.
Fig. 14 is a cross-sectional view of a guide sleeve according to one embodiment.
Fig. 15 is a cross-sectional view of a guide sleeve according to another embodiment.
Fig. 16 is a cross-sectional view of a guide sleeve according to another embodiment.
FIG. 17 is a perspective view of an electronic expansion valve with the sleeve and valve body omitted according to one embodiment.
FIG. 18 is a perspective view of a screw rod assembly according to one embodiment.
FIG. 19 is a cross-sectional view of a valve needle assembly and a screw rod assembly according to one embodiment.
FIG. 20 is a cross-sectional view of an electronic expansion valve according to another embodiment.
Fig. 21 is a cross-sectional view of a valve needle assembly according to Fig. 20.
FIG. 22 is a cross-sectional view of an electronic expansion valve having a noise reduction module installed according to one embodiment.
FIG. 23 is a cross-sectional view of a valve body with an opening for receiving cavities according to one embodiment.
Fig. 24 is a cross-sectional view of a noise reduction module according to one embodiment.
Fig. 25 is a cross-sectional view of a noise reduction module according to another embodiment.
Fig. 26 is a cross-sectional view of a noise reduction module according to another embodiment.
Fig. 27 is a cross-sectional view of an electronic expansion valve having a welded structure installed according to one embodiment.
Figure 28 is an enlarged view of E in Figure 27.
Figure 29 is an enlarged view of A in Figure 4.
Fig. 30 is a cross-sectional view of a guide sleeve according to one embodiment.
Fig. 31 is a perspective view of a connecting piece according to one embodiment.
Figure 32 is a plan view of a connecting piece according to one embodiment.
FIG. 33 is a perspective view of a nut sleeve according to one embodiment.
Fig. 34 is a cross-sectional view of a nut sleeve according to one embodiment.
In the drawing, 100 designates an electronic expansion valve, 101 designates a medium inlet pipe, 102 designates a medium discharge pipe, 103 designates an axis, 104 designates a first stage of a valve body, 105 designates a second stage of a valve body, 106 designates a first chamfer, 107 designates a second chamfer, 108 designates a welding ring, 109 designates a welding joint, 10 designates a valve body, 10a designates an inlet, 10b designates an outlet, 10c designates a mounting bracket, 10d designates a first mounting step, 10e designates a second mounting step, 10f designates a receiving cavity, 11 designates a valve port, 12 designates a valve cavity, 13 designates a through hole, 14 designates a mounting cavity, 14a designates a first positioning step, 141 designates a position-limiting portion, 141a designates an inner surface of a position-limiting portion, and 141b designates a position-limiting portion. The outer surface, 142 is an opening, 15 is a connecting cavity, 110 is a mounting seat, 111 is a mounting hole, 16 is a guide sleeve, 16a is a guide hole, 16b is a valve needle hole, 161 is a plane, 162 is a first cylindrical section, 162a is a step, 162b is a first stage of the first cylindrical section, 162c is a second stage of the first cylindrical section, 163 is a second cylindrical section, 164 is a third cylindrical section, 165 is a guide structure, 166 is a boss, 17 is a connecting piece, 18 is a first projection, 19 is a connecting groove, 120 is a debris storage structure, 121 is a first debris storage groove, 122 is a first debris guide structure, 122a is a first debris guide part, 123 is A second debris storage groove, 124 is a second debris guide structure, 124a is a second debris guide section, 20 is a valve needle assembly, 21 is a valve needle sleeve, 22 is a valve needle, 221 is a concave groove, 23 is a first spring seat, 24 is a second spring seat, 25 is an elastic member, 26 is a guide seat, 27 is a ball, 30 is a screw rod assembly, 31 is a screw rod, 311 is a second projection, 32 is a nut sleeve, 32a is a first stage of the nut sleeve, 32b is a second stage of the nut sleeve, 32c is a clamping groove, 321 is a matching section, 321a is a matching hole, 322 is a second positioning step, 323 is a stop collar, 40 is a sleeve, 50 is a rotor assembly, 51 is a rotor, 52 is a switching connection board, 53 is a position limiting member, 531 is a spring, 531a is a stop part, 532 is a stop ring, 54 is a motion guide piece, 60 is a noise reduction module, 61 is a third projection, 62 is a noise reduction hole, 621 is a first hole, 622 is a second hole, 623 is a third hole, 621a is a cylindrical hole, 622a is a conical hole, 70 is a welding structure, 71 is a fourth projection, 72 is a convex edge, 73 is a third chamfer, 80 is a pressure balance channel, 80a is a pressure balance hole, 81 is a first balance channel, 811 is a first balance hole, 812 is a second balance hole, 82 is a second balance channel, 821 is a third balance hole, 822 is a fourth balance hole, and 823 is a fifth balance hole.

Hereinafter, the present application will be described in more detail with reference to the attached drawings and specific examples.

As shown in FIG. 1 and FIG. 2, the present application provides an electronic expansion valve (100). The electronic expansion valve (100) is used to control the flow rate and pressure of a fluid medium in an air conditioning and refrigeration system. In the present embodiment, the fluid medium flowing through the electronic expansion valve (100) is a refrigerant used for heat exchange in an air conditioning and refrigeration system. The electronic expansion valve (100) performs throttle depressurization on a high-temperature and high-pressure liquid refrigerant to form a low-temperature and low-pressure gas-liquid two-phase refrigerant and performs heat exchange to achieve the refrigeration purpose.

The above electronic expansion valve (100) includes a valve body (10), a valve needle assembly (20), a screw rod assembly (30), a sleeve (40), a rotor assembly (50), and a stator assembly (not shown). The valve needle assembly (20), the screw rod assembly (30), and the sleeve (40) are mounted on the valve body (10). One end of the screw rod assembly (30) is connected to the valve needle assembly (20), and the other end is connected to the rotor assembly (50). The rotor assembly (50) is installed inside the sleeve (40), and the stator assembly is installed on the sleeve (40). The stator assembly is energized to generate a magnetic field, and rotates the rotor assembly (50) under the action of the magnetic field. The above rotor assembly (50) drives the screw rod assembly (30) to move, and the screw rod assembly (30) drives the valve needle assembly (20) to move, thereby opening and closing the electronic expansion valve (100), thereby achieving the purpose of controlling the flow rate and pressure.

As shown in Fig. 5, the valve body (10) is made of stainless steel. Of course, the valve body (10) may be made by processing other materials. In this embodiment, these are not listed one by one. The valve body (10) is generally cylindrical. Of course, in other embodiments, the valve body (10) may have other shapes.

The above valve body (10) has an axis (103), and a valve port (11), a valve cavity (12), a through hole (13), a mounting cavity (14), and a connection cavity (15) are sequentially opened along the axis (103) on the valve body (10). The valve port (11) is used to control the flow rate of a fluid medium in the valve port (11) by extending the valve needle assembly (20). When the valve needle assembly (20) closes the valve port (11), that is, when the communication between the valve port (11) and the valve cavity (12) is blocked, the electronic expansion valve (100) is closed. On the other hand, when the valve needle assembly (20) releases the seal on the valve port (11), that is, when the valve port (11) and the valve cavity (12) are communicated, the electronic expansion valve (100) is opened. The above-mentioned through hole (13) is opened in the bottom of the above-mentioned mounting cavity (14), and the diameter of the above-mentioned through hole (13) is smaller than the inner diameter of the above-mentioned mounting cavity (14). It can be understood that the installation of the above-mentioned through hole (13) causes the bottom of the above-mentioned mounting cavity (14) to form a first positioning step (14a) having a ring shape, and the above-mentioned mounting cavity (14) and the connecting cavity (15) communicate with each other along the direction of the axis (103).

An inlet (10a) and an outlet (10b) through which a fluid medium flows are further opened on the valve body (10). The valve port (11) is installed between the inlet (10a) and the outlet (10b), and the inlet (10a) is installed to communicate with the valve cavity (12). The outlet (10b) communicates with the valve port (11) to control the movement of the valve needle assembly (20), thereby implementing conduction or closure between the inlet (10a) and the outlet (10b).

Preferably, a medium inlet pipe (101) for transporting a fluid medium is mounted at the inlet (10a), and a medium discharge pipe (102) for transporting a fluid medium is mounted at the outlet (10b). In the present embodiment, the fluid medium is a refrigerant, and the refrigerant flows into the electronic expansion valve (100) from the medium inlet pipe (101), undergoes throttle depressurization by the electronic expansion valve (100), and is discharged from the medium discharge pipe (102).

In addition, as shown in Fig. 6, a first projection (18) for mounting the medium discharge pipe (102) is convexly installed at one end of the valve body (10) far from the sleeve (40). The outlet (10b) passes through the first projection (18) along the axis (103), and the outlet (10b) communicates with the valve port (11). In the present embodiment, the medium discharge pipe (102) and the valve body are connected by welding.

Preferably, the valve body (10) has a connecting groove (19) opened at one end far from the sleeve (40), the first projection (18) is positioned at the groove bottom of the connecting groove (19), and one end of the medium discharge pipe (102) is installed to cover the first projection (18) and contact the groove bottom of the connecting groove (19). Here, by installing the connecting groove (19), welding between the medium discharge pipe (102) and the valve body (10) can be easily performed, and solder can be prevented from leaking, thereby improving welding quality.

A guide sleeve (16) and a connecting piece (17) are installed on the valve body (10). The guide sleeve (16) is mounted in the mounting cavity (14) and is forcefully fitted with the mounting cavity (14). Here, the forcefully fitted means that the value obtained by subtracting the size of the outer diameter of the guide sleeve (16) matched to the size of the inner diameter of the mounting cavity (14) is a negative value. The guide sleeve (16) is used to guide the valve needle assembly (20) to move along the axial line (103) of the valve body (10). The connecting piece (17) is mounted in the connecting cavity (15) and is used to mount the screw rod assembly (30). Preferably, the connecting piece (17) is mounted in the connecting cavity (15) by a welding method.

In addition, a first mounting step (10d) is installed on the valve body, and the first mounting step (10d) is located at one end where a connection cavity (15) is opened in the valve body (10), and the sleeve (40) is mounted on the first mounting step (10d).

In one embodiment, as shown in FIGS. 3, 4 and 6, a mounting seat (110) may be installed on the valve body (10), and the sleeve (40) is mounted on the mounting seat (110). One end of the guide sleeve (16) is mounted within the mounting cavity (14) and forcefully fitted with the mounting cavity (14), and the other end extends from within the mounting cavity (14) and is connected to the screw rod assembly (30), and the connecting piece (17) is mounted on the mounting seat (110).

In addition, the mounting seat (110) generally has a cylindrical shape, and the mounting seat (110) is welded on the valve body (10) by a welding method. Of course, in other embodiments, the mounting seat (110) may be connected to the valve body (10) by another method. The sleeve (40) is welded on the mounting seat (110) by a welding method and is sealedly connected to the mounting seat (110). A mounting hole (111) is opened on the mounting seat (110), and a part of the screw rod assembly (30) extends into the mounting hole (111) and is connected to the guide sleeve (16).

In this embodiment, the mounting seat (110) is installed to replace some functions of the valve body (10) with the mounting seat (110) and is used to mount the screw rod assembly (30) and the sleeve (40). This reduces the weight of the valve body (10) and reduces the difficulty of processing the valve port (11) on the valve body. In addition, it ensures the processing precision of the valve body (10) and the valve port (11) and improves the control precision of the flow rate of the electronic expansion valve (100).

Preferably, a second mounting step (10e) is installed on the valve body (10), and the mounting seat (110) is welded on the second mounting step (10e). The valve body (10) and the mounting seat (110) may adopt an integral structure or a separate structure, and in the present embodiment, the valve body (10) and the mounting seat (110) adopt a separate structure.

In one embodiment, as shown in FIGS. 10 and 14, the mounting cavity (14) has a position-limiting portion (141) in a circumferential direction at one end far from the valve port (11). A step (162a) is used to match the position-limiting portion (141) so that the guide sleeve (16) is positioned along the axis (103). This prevents the guide sleeve (16) from loosening along the axis (103) under factors such as high pressure of the fluid medium, high/low temperature of the fluid medium, and the like, thereby generating noise.

In addition, the position limiting portion (141) is ring-shaped, and the inner diameter of the position limiting portion (141) is smaller than the inner diameter of the mounting cavity (14). Preferably, the position limiting portion (141) has a trapezoidal or arc-shaped shape along the cross-section of the plane on which the axis line (X) is located. One end of the position limiting portion (141) with a larger inner diameter is installed close to the mounting cavity (14), and one end of the position limiting portion (141) with a smaller inner diameter is installed far from the mounting cavity (14).

The above position-limiting portion (141) has an inner surface (141a) and an outer surface (141b) that are installed opposite each other and are used to make contact with the guide sleeve (16). An angle (a) is formed between the inner surface (141a) of the position-limiting portion and the inner wall of the mounting cavity (14). It should be understood that the angle (α) formed between the inner surface (141a) of the position-limiting portion and the inner wall of the mounting cavity (14) corresponds to forming an axial shoulder that limits the X-axis direction movement of the guide sleeve (16).

Preferably, the range of the angle (a) is 120°≤a≤160°. Therefore, within the angle range, not only can the guide sleeve (16) be installed within the mounting cavity (14), but also the X-axis direction movement of the guide sleeve (16) can be restricted. Specifically, in the present embodiment, the angle is a=160°.

The above position limiting part (141) may be an integral structure with the valve body (10), or may be installed separately from the valve body (10). If the position limiting part (141) and the valve body (10) are installed as an integral structure, processing and manufacturing of the valve body (10) become easier, and production costs can be reduced. If the position limiting part (141) and the valve body (10) are installed as a separate structure, mounting of the guide sleeve (16) can be easy. Since the two installation methods of the above-described position limiting part (141) and the valve body (10) each have their own advantages, a specific installation method of the position limiting part (141) can be determined according to actual needs.

Of course, in other embodiments, the position limiting member (141) may be installed as a stopper. Here, the angle between the stopper and the valve body (10) may be 90°. The stopper is ring-shaped, and the stopper is mounted in the connecting cavity (15) by a locking member such as a bolt.

As shown in Fig. 14, the guide sleeve (16) is manufactured by processing a brass material, i.e., a brass guide sleeve. Since the guide sleeve, which is a brass material, is relatively soft, the mounting between the guide sleeve (16) and the screw rod assembly (30) or the valve body (10) is easy, and noise caused by collision between the fluid medium and the guide sleeve (16) can be reduced. In other embodiments, it can be understood that the guide sleeve (16) can also be manufactured by processing a material other than brass.

The above guide sleeve (16) generally has a cylindrical shape, the guide sleeve (16) and the valve port (11) are installed apart from each other, and the cross-section of one end of the guide sleeve (16) close to the valve port (11) is a plane (161). Here, the plane (161) is a flat surface or a smooth surface. That is, since the friction coefficient of the plane (161) is relatively low, when the fluid medium passes the plane (161), it flows along the plane (161), thereby further reducing the noise of the fluid.

The above guide sleeve (16) has an axis line (Y), and a guide hole (16a) and a valve needle hole (16b) are opened along the axis line (Y) on the guide sleeve (16). The diameter of the valve needle hole (16b) is smaller than the diameter of the guide hole (16a). The valve needle hole (16b) is located at the bottom of the guide hole (16a) and communicates with the guide hole (16a).

Since the diameter of the above valve needle hole (16b) is smaller than the diameter of the above guide hole (16a), the bottom of the above guide hole (16a) is coupled to the above valve needle hole (16b) to form a position limiting step (161a), and it can be understood that the above valve needle assembly (20) is mounted within the above guide hole (16a) and moves under the guidance of the above guide hole (16a) and the above valve needle hole (16b).

Also, as shown in FIG. 4 and FIG. 12, the guide sleeve (16) may have a three-stage structure. In the present embodiment, the guide sleeve (16) includes a first cylindrical section (162) mounted in the mounting cavity (14), a second cylindrical section (163) extended into the mounting hole (111) and used to match with the screw rod assembly (30), and a third cylindrical section (164) positioned in the valve cavity (12). In another embodiment, the guide sleeve (16) may have a two-stage structure.

The first cylindrical section (162) and the mounting cavity (14) are force-fitted to ensure that the axis of the guide sleeve (16) itself overlaps the axis (Y) of the valve body (10) during the mounting process of the guide sleeve (16), thereby ensuring coaxiality between the guide sleeve (16) and the valve port (11).

Preferably, the first cylindrical section (162) is located in the middle section, that is, between the second cylindrical section (163) and the third cylindrical section (164). The outer diameter of the first cylindrical section (162) is larger than the outer diameters of the second cylindrical section (163) and the third cylindrical section (164), respectively. The first cylindrical section (162) forms a step (162a) with the second cylindrical section (163) and the third cylindrical section (164), respectively, and the step (162a) between the first cylindrical section (162) and the third cylindrical section (164) matches with the first positioning step (14a) of the bottom of the mounting cavity (14) to implement positioning of the second cylindrical section (163).

In addition, in one embodiment, the first cylindrical section (162) has a first end (162b) and a second end (162c) that are oppositely installed, and the second cylindrical section (163) is connected to the second end (162c) of the first cylindrical section. The cross-section of the first end (162b) of the first cylindrical section is a plane (161). The axis (Y) is perpendicular to the plane (161). Since the cross-section of the first end (162b) of the first cylindrical section is a plane (161), the contact frictional force between the fluid medium and the second cylindrical section (163) in contact is reduced, thereby reducing noise generation and improving user experience.

Preferably, the cross section of the first end (162b) of the first cylindrical section is in contact with the bottom of the mounting cavity (14) to implement mounting of the guide sleeve (16). In addition, the first end (162b) of the first cylindrical section has a guide structure (165) in the circumferential direction. Here, the installation of the guide sleeve (16) can be facilitated through the installation of the guide structure (165). In addition, an end of the second cylindrical section (163) that is far from the first cylindrical section (162) also has the guide structure (165a) in the circumferential direction.

Specifically, the guide structure (165) includes a guide part (165a) installed in the second end (162c) of the first cylindrical section. Preferably, the guide part (165a) is a fillet guide part or a conical guide part. Of course, in other embodiments, the guide structure (165) may have a different structure.

As shown in Fig. 15, in another embodiment, the structure of the guide sleeve (16) is basically the same as the structure of the guide sleeve (16) in the above embodiment. However, there is a difference in that a boss (166) is installed on the cross-section of the first end (162b) in the first cylindrical section, and a cross-section of a portion of the boss (166) that is far from the first cylindrical section is the plane (161). The boss (166) extends into the through hole (13), and the plane (161) comes into contact with the first positioning step (14a) to implement positioning and installation of the guide sleeve (16).

As illustrated in FIG. 16, in another embodiment, the structure of the guide sleeve (16) is basically the same as the structure of the guide sleeve (16) in the above embodiment. However, there is a difference in that the third cylindrical section (164) is installed at the first end (162b) of the first cylindrical section, the third cylindrical section (164) and the valve port (11) are installed spaced apart from each other, and the end of the third cylindrical section (164) farther from the first cylindrical section (162) is the plane (161). The outer diameter of the third cylindrical section (164) is smaller than the outer diameter of the second cylindrical section (163), and the step (162a) is also formed between it and the second cylindrical section (163). The third cylindrical section (164) extends into the valve cavity (12) from the through hole (13). Preferably, the third cylindrical section (164) has a stepped shape.

In addition, the length of the second cylindrical section (163) is 1/4 to 1/3 times the length of the guide sleeve. Here, the length of the second cylindrical section (163) is 1/4 to 1/3 times the length of the guide sleeve. Therefore, it can be understood that the guide sleeve (16) can have a size sufficient to match the screw rod assembly (30), and the connection reliability is also improved, and the risk of the guide sleeve (16) becoming loose due to vibration reduction, etc. is also reduced. Of course, as the third cylindrical section (164) becomes longer, the overall length of the guide hole (16a) increases. The valve needle assembly (20) is mounted within the guide hole (16a), so that the overall coaxiality of the valve needle assembly (20) is improved.

Preferably, the length of the second cylindrical section (163) is 3/10 times the length of the guide sleeve (16). Since the length of the second cylindrical section (163) is generally 1/3 times the length of the guide sleeve (16), it can be understood that the connection reliability between the second cylindrical section (163) and the screw rod assembly (30) is further improved.

The third cylindrical section (164) has a guide structure at one end that is farther away from the first cylindrical section (162). By installing the guide structure here, the guide sleeve (16) can be easily mounted. Specifically, the guide structure is a structure such as a chamfer or a conical surface installed on the first cylindrical section (162) and the third cylindrical section (164).

In addition, the connecting piece (17) is welded to the valve body (10), and a mounting bracket (10c) is further installed on the valve body (10). The mounting bracket (10c) is installed at a connection point between the valve body (10) or the valve body (10) and the mounting seat (110). The mounting bracket (10c) is welded to the valve body (10), or is welded to the valve body (10) and the mounting seat (110), respectively. The mounting bracket (10c) is matched with an external device to implement mounting of the electronic expansion valve (100).

In addition, as shown in FIG. 8, a debris storage structure (120) is installed between the valve body (10) and the guide sleeve (16), and the debris storage structure (120) is used to store debris between the valve body (10) and the guide sleeve (16). Therefore, during the process of mounting the guide sleeve (16), debris on the valve body (10) and the guide sleeve (16) is prevented from entering the electronic expansion valve (100) in the form of impurities and affecting the normal operation of the electronic expansion valve (100).

In one embodiment, as illustrated in FIG. 9, the mounting cavity (14) has an inner wall, and the debris storage structure (120) includes a first debris storage groove (121) opened in a circumferential direction of the inner wall of the mounting cavity (14).

Preferably, the first debris storage groove (121) can be installed in plurality, and the plurality of first debris storage grooves (121) are installed on the inner wall of the mounting cavity (14) at intervals along the axis (X) of the valve body (10). A first debris guide structure (122) is provided in the notch of each of the first debris storage grooves (121), so that it is easy to guide debris on the valve body (10) and the guide sleeve (16) to flow into the first debris storage groove (121).

Specifically, the first debris guide structure (122) includes a first debris guide portion (122a) installed on the inner wall of the mounting cavity (14), and the first debris guide portion (122a) is located in a notch of the first debris storage groove (121). Preferably, the first debris guide portion (122a) is located in an inclined debris guide portion or a fillet debris guide portion.

In addition, the mounting cavity (14) has an opening (142), and the opening (142) is installed away from the valve port (11). The first debris storage groove (121) is installed on the inner wall of the mounting cavity (14) with the opening (142) end close to the mounting cavity (14). Therefore, under the premise that the assembly requirements are met, the matching section angle between the guide sleeve (16) and the opening (142) end of the mounting cavity (14) is reduced as much as possible to reduce extrusion of debris.

In another embodiment, as shown in FIGS. 12 and 13, the guide sleeve (16) has an outer wall, and the debris storage structure (120) includes a second debris storage groove (123) opened in the circumferential direction of the outer wall of the guide sleeve.

Preferably, the second debris storage groove (123) is installed on the outer wall of the first cylindrical section (162). In addition, the second debris storage groove (123) is installed close to the second end (162c) of the first cylindrical section (162). It can be understood that the second end (162c) of the first cylindrical section (162) is installed as a force-fit matching section with the relatively short mounting cavity (14), thereby reducing extrusion of debris.

In addition, the second debris storage grooves (123) may be installed in plurality. A plurality of the second debris storage grooves (123) are installed on the outer wall of the first cylindrical section (162) at intervals along the axis (Y) of the guide sleeve (16). A second debris guide structure (124) is provided in the notch of each of the second debris storage grooves (123), so that debris on the valve body (10) and the guide sleeve (16) can easily be guided to flow into the second debris storage groove (123).

Specifically, the second debris guide structure (124) includes a second debris guide portion (124a) installed on the outer wall of the guide sleeve (16), and the second debris guide portion (124a) is located in a notch of the second debris storage groove (123). Preferably, the second debris guide portion (124a) is located in an inclined debris guide portion or a fillet debris guide portion.

In another embodiment, the mounting cavity (14) has an inner wall, and the guide sleeve (16) has an outer wall. The debris storage structure (120) includes a first debris storage groove (121) of embodiment 1 and a second debris storage groove (123) of embodiment 2. The first debris storage groove (121) on the inner wall of the mounting cavity (14) and the second debris storage groove (123) on the outer wall of the guide sleeve (16) are installed to be staggered from each other along the axis (103).

As shown in FIGS. 17, 18 and 19, in one embodiment, the valve needle assembly (20) includes a valve needle sleeve (21) mounted in the guide sleeve (16), and a valve needle (22) mounted in the valve needle sleeve (21). The valve needle (22) has an axis, and the axis of the valve needle (22) is installed to overlap the axis (103) of the valve body (10). One end of the valve needle (22) is connected to the screw rod assembly (30), and the other end is matched to the valve port (11). The screw rod assembly (30) controls the opening and closing of the valve port (11) by driving the valve needle (22) to move, thereby implementing the opening and closing of the electronic expansion valve (100).

The above valve needle assembly (20) further includes a first spring seat (23), a second spring seat (24), an elastic member (25), and a guide seat (26). The first spring seat (23), the second spring seat (24), and the elastic member (25) are accommodated in the valve needle sleeve (21), and the first spring seat (23) is connected to the screw rod assembly (30) and abuts on the guide seat (26). One end of the elastic member (25) abuts on the first spring seat (23). The other end abuts on the second spring seat (24), and the guide seat (26) is mounted at an end of the valve needle sleeve (21) that is far from the valve needle (22) and abuts on the second spring seat (24), and the guide seat (26) is configured to match the screw rod assembly (30).

In addition, the valve needle assembly (20) further includes a ball (27), and the ball (27) is accommodated in the valve needle sleeve (21). The ball (27) is installed between the valve needle (22) and the screw rod assembly (30), and is used to reduce the area of the frictional contact surface between the valve needle (22) and the screw rod assembly (30). This reduces wear and tear of the valve needle (22) and the screw rod assembly (30), and improves the reliability and stability of the electronic expansion valve (100).

Preferably, the ball (27) is installed between the second spring seat (24) and the valve needle (22), and the ball (27) is welded between the valve needle (22) or the second spring seat (24) by spot welding. In the present embodiment, a concave groove (221) is opened on the valve needle (22), the ball (27) is mounted in the concave groove (221), and the ball (27) and the valve needle (22) are welded by spot welding. Here, through the installation of the ball (27), the second spring seat (24) and the valve needle (22) come into point contact, so that the frictional contact surface between the second spring seat (24) and the valve needle (22) is reduced. Accordingly, contact wear between the second spring seat (24) and the valve needle (22) is reduced, thereby improving the reliability and stability of the electronic expansion valve (100).

As shown in FIG. 19, FIG. 33 and FIG. 34, the screw rod assembly (30) includes a screw rod (31) and a nut sleeve (32). The screw rod (31) has first and second ends that are installed oppositely. One end of the screw rod (31) is connected to the rotor assembly (50), and the second end of the screw rod (31) passes through the nut sleeve (32) and is connected to the first spring seat (23). The second end of the screw rod (31) and the nut sleeve (32) are thread-connected, and one end of the nut sleeve (32) is mounted on the connecting piece (17).

In addition, the nut sleeve (32) has a first end (32a) and a second end (32b) that are installed oppositely, and the first end (32a) of the nut sleeve is mounted on the connecting piece (17), and the second end (32b) of the nut sleeve is accommodated in the sleeve (40). The first end (32a) of the nut sleeve is extended to have a matching section (321) installed, and the matching section (321) extends into the mounting hole (111) and is installed close to the first cylindrical section (162).

Preferably, a clamping groove (32c) is installed in the first end (32b) of the nut sleeve, and a clamping projection is installed in the clamping groove (32c). Correspondingly, a connecting hole is opened on the connecting piece (17), and the first end (32b) of the nut sleeve is mounted in the connecting hole and implements a clamping connection with the connecting piece (17) through the clamping projection. When the screw rod (31) rotates under the driving of the rotor assembly (50), due to the matching relationship of the nut screw rod formed between the screw rod (31) and the nut sleeve (32), the screw rod (31) and the rotor assembly (50) fixedly connected to the screw rod (31) move along the axial direction of the screw rod (31), thereby implementing the screw rod (31) to drive the movement of the valve needle assembly (20).

In addition, a matching hole (321a) is opened on the matching section (321), and the third cylindrical section (164) extends from the matching hole (321a) into the nut sleeve (32) and is fixedly connected to the nut sleeve (32). It can be understood that by installing the matching section (321), the matching length between the guide sleeve (16) and the nut sleeve (32) can be extended, and thus the connection reliability between the guide sleeve (16) and the nut sleeve (32) can be improved.

Preferably, the fixed connection includes a screw connection, a forced fit, etc. In the present embodiment, since the third cylindrical section (164) and the nut sleeve (32) are forcedly fitted together, the nut sleeve (32) can be properly guided through the third cylindrical section (164) so that the axial line of the nut sleeve (32) overlaps with the axial line of the guide sleeve (16) and the axial line of the valve body (10).

In the present embodiment, there is a force fit between the first cylindrical section (162) and the mounting cavity (14). Since there is a force fit between the third cylindrical section (164) and the nut sleeve (32), the valve body (10) is properly guided through the first cylindrical section (162). The third cylindrical section (164) properly guides the nut sleeve (32), thereby overlapping the three-way axes of the valve body (10), the guide sleeve (16) and the nut sleeve (32), thereby ensuring the three-way coaxiality of the screw rod (31), the valve needle (22) and the valve port (11). Through this, it can be understood that the collision between the valve needle (22) and the valve body (11) during the exercise process is reduced, and further, wear and tear on parts such as the valve needle (22) is reduced, thereby improving the service life of the electronic expansion valve (100).

A second positioning step (322) can be installed within the above nut sleeve (32), and the second cylindrical section (163) extends into the nut sleeve (32) and comes into contact with the second positioning step (322). In addition, the reliability of the guide sleeve (16) is further improved, and noise is prevented from occurring due to the guide sleeve (16) moving arbitrarily in the axial direction under the pressure of the fluid medium.

As illustrated in FIGS. 20 and 21, in another embodiment, the basic structure of the valve needle assembly (20) is basically the same as the structure of the valve needle assembly (20) described above, but there is a difference in that the valve needle assembly (20) further includes a bearing (211), a gasket (212), and an elastic member (213). The bearing (211) and the gasket (212) are installed at one end close to the valve needle (22) in the screw rod assembly (30), and one end of the elastic member (213) is in contact with the gasket (212), and the other end is in contact with the valve needle (22). One end of the bearing (211) is in contact with the screw rod assembly (30) and the valve needle sleeve (21), and the other end is in contact with the gasket (212). The gasket (212) is accommodated within the valve needle sleeve (21) and is in contact with the outer ring of the bearing (211).

A second projection (311) extending along the radial direction of the screw rod (31) is installed on the screw rod (31), and the second projection (311) is flush with the inner surface of the valve needle sleeve (21). The inner ring of the bearing (211) abuts against the second projection (311), and the inner surface of the valve needle sleeve (21) abuts against the outer ring of the bearing (211), thereby implementing positional restrictions for the screw rod (31) and the valve needle sleeve (21) relative to the bearing (211).

The screw rod (31) is fixedly connected to the inner ring of the bearing (211). In this embodiment, the screw rod (31) and the inner ring of the bearing (211) are fixed to each other by a forced fit. That is, the size of the screw rod (31) is larger than the diameter of the inner ring of the bearing (211), and at this time, the space between the screw rod (31) and the bearing (211) has relatively preferable stability.

In other embodiments, it can be understood that the inner ring of the screw rod (31) and the bearing (211) may be fixed to each other through other connecting methods such as riveting, bonding, etc.

The screw rod (31) rotates under the driving of the rotor assembly (50). Due to the fixed connection between the screw rod (31) and the inner ring of the bearing (211), the screw rod (31) drives the inner ring of the bearing (211) to rotate. The rolling elements within the bearing (211) come into rolling contact with the outer ring of the bearing (211) to release the rotation of the screw rod (31). Since a plurality of rolling elements are provided within the bearing (211), the release of the rotation of the screw rod (31) changes the single-point rolling contact of the conventional electronic expansion valve (100) into the multi-point rolling contact of the present embodiment. Therefore, the contact force is shared and endured by the plurality of rolling elements, so the contact pressure on each contact point is lowered, and the rolling friction weakens the frictional force.

In addition, due to the coaxial mounting of the bearing (211) and the screw rod (31), the contact force on the cloud element becomes perpendicular to the gravity direction of the screw rod (31). This relatively weakens the contact force on the contact point of the conventional electronic expansion valve and improves the stability and reliability of the electronic expansion valve (100). At the same time, since the bearing (211) has a clearance so that the valve needle (22) has a certain degree of freedom, the coaxial error between the valve needle (22) and the valve port (11) can be reduced.

In this embodiment, the elastic member (213) is a spring, and in this case, the elastic member (213) has relatively high connection stability. It can be understood that in other embodiments, the elastic member (213) may be another type of elastic element, such as an elastic column.

With continued reference to FIG. 4 and FIG. 17, the rotor assembly (50) includes a rotor (51) positioned within the sleeve (40), a switching connection board (52) for mounting the screw rod (31), a position limiting member (53) for limiting a rotation angle of the rotor (51), and a motion guide member (54) mounted on the switching connection board (52). The rotor (51) is mounted on the switching connection board (52), and the switching connection board (52) and the screw rod (31) are fixedly connected by a method such as welding.

The above position limiting member (53) includes a spring (531) installed to cover the nut sleeve, and a stop ring (532) mounted on the motion guide piece (54). One end of the spring (531) is connected to the connecting piece (17), a stop portion (531a) is installed on the other end of the spring (531), and the stop ring (532) is wound on the spring (531). Preferably, a stop collar (323) is installed on the outer wall of the nut sleeve (32), and the stop collar (323) is configured to match the stop ring (532) to limit the rotation angle of the rotor (51).

In one embodiment, when the rotor (51) rotates and moves along the axis (103) to drive the screw rod (31) to close the valve needle (22) to the valve port (11), the stop ring (532) moves along the spring (531), and the stop ring (532) comes into contact with the stop collar (323) to limit the rotation angle of the rotor (51) to the lower limit of the rotor (51). In the process in which the above rotor (51) rotates and moves along the axis (103) to drive the screw rod (31) to cause the valve needle (22) to open the valve port (11), the stop ring (532) moves along the spring (531), and the stop ring (532) comes into contact with the stop portion (531a) to limit the rotation angle of the rotor (51) to the upper limit of the rotor (51).

In addition, the outer side of the screw rod (31) extends along the radial outer side of the screw rod (31) to form a boss (311). The boss (311) on the screw rod (31) contacts the guide seat (26) and thus determines the lower limit of movement of the rotor (51) and the screw rod (31) in the electronic expansion valve (100).

Since the lower limit of the electronic expansion valve (100) is determined by the mutual contact between the screw rod (31) and the guide seat (26), the screw rod (31) is a long, straight column member, and the direction of the impact force generated by the mechanical collision is consistent with the axial direction of the screw rod (31). In addition, not only is the vibration and noise generated relatively small, but also the vibration and noise generated by the impact force can be dissipated relatively quickly on the long, straight column member, so the electronic expansion valve (100) has relatively reduced noise generated due to the limitation of the motion state transition of the rotor assembly (50) of the lower limit.

In one embodiment, the upper limit of the electronic expansion valve (100) is implemented by the mutual contact between the stop ring (532) and the stop portion (531a) of the spring (531). When the rotor (51) rotates and moves along the axis (103) to drive the screw rod (31) to close the valve needle (22) to the valve port (11), the stop ring (532) moves along the spring (531). The stop ring (532) contacts the stop portion (531a) to limit the rotational angle of the rotor (51) to the upper limit of the rotor (51) and the screw rod (31).

In another embodiment, in order to further reduce noise generated when the rotor assembly (50) in the electronic expansion valve (100) switches between motion states, the upper limit of the electronic expansion valve (100) is determined by the mutual contact between the end of the screw rod (31) farther from the valve needle assembly (20) and the sleeve (40). By adjusting the sizes of the stop portion (531a) and the stop portion (532) of the spring (531), the stop ring (532) is prevented from contacting the stop portion (531a) of the spring (531) when the sleeve (40) contacts the screw rod (31), thereby setting the contact between the screw rod (31) and the sleeve (40) as the upper limit of the electronic expansion valve (100).

At this time, the upper limit of the electronic expansion valve (100) is still determined by the screw rod (31), and the screw rod (31) is a long straight column member, so that the direction of the impact force generated by the mechanical collision is consistent with the axial direction of the screw rod (31). Therefore, not only is the vibration and noise generated relatively small, but also the vibration and noise generated by the impact force can be quickly dissipated on the long straight column member, so that the electronic expansion valve (100) relatively reduces the noise generated by the upper limit of the rotor assembly (50) motion state transition limit.

In addition, one end of the screw (31) adjacent to the sleeve (40) is set to a curved surface to match the shape of the inner surface of the sleeve (40). At this time, the connection between the screw rod (31) and the sleeve (40) has a relatively desirable connection performance.

In another embodiment, the upper limit of the electronic expansion valve (100) can be further implemented by the mutual contact of the guide seat (26) and the nut sleeve (32), and the nut sleeve (32) is in contact with the guide seat (26). Since the guide seat (26) is fixedly connected to the screw rod (31), the screw rod (31) can be limited to be further from the valve port (11) through the contact of the nut sleeve (32) with the guide seat (26). At this time, by setting the length of the screw rod (31), when the nut sleeve (32) and the guide seat (26) are in contact, the screw rod (31) is prevented from contacting the sleeve (40), thereby ensuring that the upper limit of the electronic expansion valve (100) is determined by the contact between the nut sleeve (32) and the guide seat (26).

The nut sleeve (32) is a return member with a relatively large volume, so that noise caused by impact force generated by mechanical collision is relatively small, and noise caused by vibration and vibration generated on the nut sleeve (32) is quickly eliminated, so noise caused by the upper limit of the rotor assembly (50) motion state transition limit in the electronic expansion valve (100) is relatively reduced.

When the upper limit of the electronic expansion valve (100) is not implemented by the mutual contact between the stop ring (532) and the stop portion (531a) of the spring (531), that is, when the above implementation method is adopted in the electronic expansion valve (100), it can be seen that the stop ring (532) and the spring (531) may be omitted. The structure of the electronic expansion valve (100) in which the stop ring (532), the motion guide piece (54), and the spring (531) are omitted is as shown in FIGS. 18 and 19.

It can be understood that the rotor assembly (50) and the screw rod assembly (30) move together, and the upper and lower limits of the motion of the rotor assembly (50), i.e. the upper and lower limits of the motion of the screw rod assembly (30), are not distinguished in this specification.

The lower limit mentioned in this specification means the maximum working position moving from the screw rod (31) toward the valve port (11), and the working position is referred to as the lower limit. The upper limit mentioned in this specification means the maximum working position moving from the screw rod (31) away from the valve port (11), and the working position is referred to as the upper limit. The “upper” and “lower” in the upper limit and lower limit do not have the concept of direction, and are only referred to for the convenience of explanation.

The above stator assembly (not shown) includes a coil or other member used to generate a magnetic field after energization, and rotates the rotor (51) under the action of the magnetic field to implement rotation of the screw rod (31).

In the present embodiment, the electronic expansion valve (100) is an electric electronic expansion valve, and the rotor (51) is a motor rotor made of permanent magnets in a stepping motor. The stator assembly is a motor stator in a stepping motor, and the stepping motor receives a logic digital signal provided by a control circuit and then transmits the signal to each phase coil of the motor stator. The motor rotor made of permanent magnets rotates by magnetic torque action, thereby implementing a motion process in which the stator assembly drives the rotor assembly to rotate.

The electronic expansion valve (100) of the present application adopts an integrated valve seat, and by integrating the valve core seat and the sleeve seat of the conventional electronic expansion valve using the integrated valve seat, the number of times of assembling the electronic expansion valve (100) in the axial direction is reduced. That is, the possibility that the coaxiality of each component of the electronic expansion valve (100) may decrease due to multiple assemblies is reduced, and the coaxiality between each component of the electronic expansion valve (100) is improved. In addition, by reducing the number of components, the valve opening performance of the electronic expansion valve (100) can be guaranteed, the ease of mounting can be further improved, and the reliability and stability of the entire product can be improved.

Also, as illustrated in FIG. 7, the valve port (11) is installed coaxially with the valve body (10). One end where the valve port (11) is opened is named the first end (104) of the valve body (10), and the other end on the valve body (10) facing the first end (104) is named the second end (105). The valve port (11) is opened so as to be transferred along the direction pointing from the second end (105) to the first end (104). By adopting the upper transfer processing method, the valve port of the valve body (10) is fitted only once during processing, so that the number of times the valve port (11) of the valve body (10) is mounted during the manufacturing process is reduced, so that the possibility of a positioning error occurring in the valve port (11) of the valve body (10) during the processing process is reduced, and the coaxiality of the valve port (11) and the valve body (10) is improved.

In addition, since the valve port (11) is directly opened on the valve body (10), the welding fixation between the valve seat core opening the valve port and the valve body is reduced compared to the conventional electronic expansion valve. The reduction in the number of welds improves the integrity of the valve body (10), thereby improving the reliability and stability of the electronic expansion valve (100).

The valve port (11) has a first chamfer (106) installed at one end near the second end (105) of the valve body (10). Due to the opening of the first chamfer (106), the valve port (11) forms an open structure at a portion near the second end (105) of the valve body (10). Accordingly, the sealing performance of the valve needle (22) within the valve port (11) is improved, internal leakage of the electronic expansion valve (100) is reduced, and the control precision for the fluid flow rate of the electronic expansion valve (100) can be improved.

A second chamfer (107) is installed at one end of the valve port (11) that is farther away from the second end (105) of the valve body (10). Due to the opening of the first chamfer (106) and the second chamfer (107), burrs that occur during the machining process of the valve port (11) are removed, thereby allowing the fluid medium to have smoother flow characteristics when passing through the valve port (11).

Preferably, both the first chamfer (106) and the second chamfer (107) are less than 0.1 mm.

In addition, in order to further block noise, the wall thickness where the valve body (10) and the guide sleeve (16) come into contact with each other is 30% to 80% of the radius of the valve body (10). By setting the wall thickness where the valve body (10) and the guide sleeve (16) come into contact with each other to 30% to 80% of the radius of the valve body (10), noise can be better blocked and the distribution noise of the fluid medium can be sealed inside the valve body (10). If the wall thickness of the valve body (10) is too thin, the sealing effect against noise is relatively low. On the other hand, if the wall thickness of the valve body (10) is too thick, it is disadvantageous to fixally mount a member such as a valve needle assembly (20) inside the valve body (10).

Preferably, the wall thickness where the valve body (10) and the guide sleeve (16) come into contact with each other is 80% of the radius of the valve body (10).

As illustrated in FIG. 22, in order to reduce noise generated during use in the electronic expansion valve (100) and to reduce turbulent noise generated due to flow instability when the fluid medium passes through the valve port (11), a noise reduction module (60) is installed between the medium discharge pipe (102) and the valve body (10). The noise reduction module (60) improves stability when the fluid medium passes through the valve port (11), thereby reducing turbulent noise generated during use of the electronic expansion valve (100).

As illustrated in FIG. 23, a receiving cavity (10f) communicating with a valve port (11) is opened on a valve body (10), and the receiving cavity (10f) is configured to receive a noise reduction module (60). One end of the noise reduction module (60) extends outward in a direction perpendicular to the central axis of the valve body (10) to form a third protrusion (61). A medium discharge pipe (102) covers a part of the noise reduction module (60) and is installed so as to be in contact with the third protrusion (61). One end of the noise reduction module (60) is in contact with the valve body (10), and the other end is in contact with the medium discharge pipe (102). The welding fixation between the medium discharge pipe (102) and the valve body (10) causes the noise reduction module (60) to be inserted and fixed between the valve body (10) and the medium discharge pipe (102).

In another embodiment, it can be understood that the noise reduction module (60) may adopt a different structure and be fixed between the valve body (10) and the medium discharge pipe (102). For example, the medium discharge pipe (102) may be in direct contact with the other end of the noise reduction module (60) far from the valve port (11), and in this case, the third protrusion (61) formed on the noise reduction module (60) may also be omitted.

A noise reduction hole (62) is installed on the noise reduction module (60), and the noise reduction hole (62) is docked to the valve port (11). The diameter of the hole communicating with the valve port (11) of the noise reduction hole (62) matches the diameter of the valve port (11), so that when the fluid medium flows into the noise reduction hole (62) through the valve port (11), the fluid medium flows smoothly. This prevents turbulence from occurring when the fluid medium flows into the noise reduction hole (62) through the valve port (11).

In this embodiment, the noise reduction hole (62) is installed coaxially with the valve port (11).

Referring to FIG. 24, in one embodiment, the noise reduction hole (62) is a step hole, and the noise reduction hole (62) gradually expands in a direction away from the valve port (11).

In the present embodiment, the noise reduction hole (62) is a three-stage step hole, and the noise reduction hole (62) includes a first hole (621), a second hole (622), and a third hole (623). The first hole (621) is docked to the valve port (11), and the first hole (621), the second hole (622), and the third hole (623) penetrate each other along the axial direction. The second hole (622) is located between the first hole (621) and the third hole (623), and the diameter of the third hole (623) is larger than the diameter of the second hole (622), and the diameter of the second hole (622) is larger than the diameter of the first hole (621).

In this embodiment, in order to further reduce turbulence occurring during fluid distribution and to reduce noise when using the electronic expansion valve (100), the first hole (621), the second hole (622), and the third hole (623) are installed coaxially as symmetrical circular holes.

Of course, if turbulence that may occur due to structural asymmetry when the fluid passes through the step holes is not considered, a gap may be formed between the central axes of each of the first hole (621), the second hole (622), and the third hole (623), and the first hole (621), the second hole (622), and the third hole (623) may adopt the shape of an irregular hole.

In other embodiments, it can be understood that the noise reduction hole (62) may adopt a two-section, four-section, or more than four-section structural form as long as the noise reduction hole (62) can form a step hole that gradually expands in a direction away from the valve port (11).

Below, the principle by which the noise reduction module (60) reduces fluid medium circulation noise in this embodiment is explained.

The noise reduction hole (62) is a stepped hole, and when the fluid medium flows into the noise reduction hole (62) through the valve port (11), the effective circulation cross-section is gradually expanded in a stepped manner. After the fluid medium flows into the noise reduction hole (62), the flow rate slows down, and the fluid medium suppresses the occurrence of a free shear surface through the noise reduction hole that gradually expands. In other words, the stability of the fluid medium is improved, and the fluid medium generates relatively less eddy noise, so that noise is reduced when using the electronic expansion valve (100).

Also, referring to FIG. 25 together, in another embodiment, the noise reduction hole (62) is a horn hole, and the noise reduction hole (62) includes a cylindrical hole (621a) communicating with the valve port (11) and a conical hole (622a) communicating with the cylindrical hole (621a). The conical hole (622a) has one end connected to the cylindrical hole (621a) gradually expanded in a direction away from the valve port (11). The diameter of the cylindrical hole (621a) matches the diameter of the valve port (11).

It can be seen that the conical hole (622a) can be directly docked to the valve port (11). That is, the diameter of one end of the conical hole (622a) toward the valve port (11) matches the diameter of the valve port (11), and in this case, the cylindrical hole (621) can be omitted.

The opening of the cylindrical hole (621a) corresponds to an increase in the length of the valve port (11), thereby further improving the stability of the fluid medium.

Below, the principle by which the noise reduction module (60) reduces fluid medium circulation noise in this embodiment is explained.

The noise reduction hole (62) is a horn hole, and the effective circulation cross-section gradually expands when the fluid medium flows into the noise reduction hole (62) through the valve port (11). After the fluid medium flows into the noise reduction hole (62), the flow rate slows down, and the fluid medium suppresses the occurrence of a free shear surface through the noise reduction hole through which it gradually expands. In other words, the stability of the fluid medium is improved, and the fluid medium generates relatively less eddy noise, so that noise is reduced when using the electronic expansion valve (100).

Referring to FIG. 26 together, in another embodiment, the noise reduction hole (62) is a straight hole. The noise reduction hole (62) penetrates two cross sections of the noise reduction module (60) and is docked to the valve port (11), and the diameter of the noise reduction hole (62) matches the diameter of the valve port (11).

Below, the principle by which the noise reduction module (60) reduces fluid medium circulation noise in this embodiment is explained.

The noise reduction hole (62) is a straight hole with a relatively long length, and the noise reduction hole (62) corresponds to an extension of the length of the valve port (11). This causes the velocity and pressure of the fluid medium circulating at the inlet end of the valve port (11) and the outlet end of the noise reduction hole (62) to descend at a gradient. In other words, it improves the stability of the fluid medium and reduces noise generated in the electronic expansion valve (100) during use.

In addition, the noise reduction module (60) is modularized and fixed within the valve body (10), and the noise reduction module and the valve body (10) are installed separately. This eliminates the need to open a valve port (11) of a complex shape that is more difficult to process in the valve body (10) whose shape is already relatively complex on the electronic expansion valve (100). Therefore, by adopting a combination of a standardized valve body (10) and a customized noise reduction module in the electronic expansion valve (100), the electronic expansion valve (100) parts can be further standardized.

As shown in FIG. 27 and FIG. 28, a welding ring (108) is further installed at one end where the medium discharge pipe (102) and the valve body (10) come into contact. Adjacent two side surfaces of the welding ring (108) come into contact with the valve body (10) and the medium discharge pipe (102), respectively. The welding ring (108) is used to fill the welding joint (109) between the valve body (10) and the medium discharge pipe (102). The welding ring (108) is melted under high temperature heating of an external welding equipment, and is introduced as a molten filler into the welding joint (109) formed between the valve body (10) and the medium discharge pipe (102), thereby implementing welding fixation to the valve body (10) and the medium discharge pipe (102).

In addition, a welding structure (70) is further installed on the electronic expansion valve (100), and the welding structure (70) includes a fourth projection (71) that is formed to extend perpendicularly to the direction of the axis (103) of the valve body (10) on one end near the medium discharge pipe (102) in the valve body (10). The medium discharge pipe (102) and the fourth projection (71) are in contact with each other, and the contact surface of the medium discharge pipe (102) and the fourth projection (71) is a welding joint (109) that must fill a welding material between the valve body (10) and the medium discharge pipe (102).

By installing the fourth projection (71) on the valve body (10), the formation location of the weld joint (109) is installed in a direction away from the contact surface of the weld ring (108) and the valve body (10), so that the center of the weld ring (108) and the weld joint (109) can be coplane. The coplane between the center of the weld ring (108) and the weld joint (109) is evenly aligned so that the weld ring (108) flows smoothly into the weld joint (109) during welding, thereby preventing welding deformation and welding detachment from occurring.

The welding structure (70) further includes a convex edge (72) installed on the medium discharge pipe (102). The medium discharge pipe (102) extends a fourth projection (71) along the axial line (103) of the valve body (10) to form the convex edge (72). That is, the thickness of the medium discharge pipe (102) is greater than the radial extension length of the fourth projection (71), and the welding ring (108) can enter the welding joint (109) along the convex edge (72) in a molten state during welding, thereby further improving the welding quality between the valve body (10) and the medium discharge pipe (102).

The welding structure (70) further includes a third chamfer (73) installed on a cross-section where the medium discharge pipe (102) and the valve body (10) come into contact. The third chamfer (73) connects the convex edge (72) and the outer surface of the medium discharge pipe (102), and the welding ring (108) comes into contact with the valve body (10) through the third chamfer (73). Due to the opening of the third chamfer (73), an accommodation space (74) for accommodating the welding ring (108) is formed between the valve body (10) and the medium discharge pipe (102). Since the accommodation space has an open structure, it is easier to fix the welding ring (108) on the valve body (10) and the medium discharge pipe (102), and the welding ring (108) can more easily enter the weld joint (109) during welding.

The above electronic expansion valve (100) installs a welding structure (70) on the valve body (10) and the medium discharge pipe (102), so that the center of the welding ring (108) is aligned flatly with the welding joint (109), and the welding ring (108) can smoothly flow into the welding joint (109) in a molten state during welding. In addition, the welding forming quality between the valve body (10) and the medium discharge pipe (102) is improved, and the reliability and stability of the electronic expansion valve (100) are improved.

As illustrated in FIG. 2, the electronic expansion valve (100) further includes a pressure balance channel (80). The pressure balance channel (80) is used to balance the medium pressure of the inlet (10a) and the internal pressure of the electronic expansion valve (100), thereby preventing impact of the fluid medium on the guide sleeve (16) and reducing noise. In addition, when there is a change in the medium pressure of the inlet (10a), the pressure inside the electronic expansion valve (100) is quickly balanced with the pressure of the inlet through the pressure balance channel (80), thereby preventing an additional load from being generated inside the electronic expansion valve (100) and improving the stability of operation of the electronic expansion valve (100).

In one embodiment, the pressure balance channel (80) is installed between the guide sleeve (16) and the valve body (10). The pressure balance channel (80) is used to communicate between the inside of the guide sleeve (16) and the valve body (10), thereby balancing the fluid medium pressure between the fluid medium pressure of the inlet (10a) and the inside of the guide sleeve (16).

In addition, as shown in FIG. 12, a pressure balance channel (80) is opened on the guide sleeve (16). The pressure balance channel (80) communicates between the valve cavity (12) and the guide hole (16a), thereby balancing the pressure between the valve cavity (12) and the guide hole (16a). Therefore, when the valve port (11) is opened, the fluid medium enters the valve cavity (12). At the same time, some of the fluid medium flows into the guide hole (16a) through the pressure balance channel (80), thereby balancing the pressure between the guide hole (16a) and the valve cavity (12). This prevents impact of the fluid medium on the guide sleeve (16) and reduces noise. In addition, when the system pressure changes, the internal pressure of the electronic expansion valve (100) can be quickly balanced, thereby preventing additional load due to pressure difference and improving the stability of operation of the electronic expansion valve (100).

In this embodiment, the pressure between the valve cavity (12) and the guide hole (16a) is balanced through the pressure balance channel (80). That is, by balancing the pressure of the valve cavity (12) and other parts of the electronic expansion valve (100) except for the valve cavity (12), the entire inside of the electronic expansion valve (100) is brought into a pressure balanced state, thereby preventing additional load from being generated inside the electronic expansion valve (100).

Preferably, the pressure balance channel (80) includes at least one pressure balance hole (80a), and the pressure balance hole (80a) communicates the valve cavity (12) and the guide hole (16a) with each other. Therefore, some of the fluid medium enters the guide hole (16a) through the pressure balance hole (80a) to achieve the purpose of pressure balance.

The above pressure balance hole (80a) has an axis line, and the axis line of the pressure balance hole (80a) is installed parallel to the axis line (X). The pressure balance hole (80a) is vertically opened on the guide sleeve (16), so that it can be understood that the pressure balance hole (80a) does not affect the fluid medium flow direction and eliminates noise due to changes in the fluid medium flow direction.

In addition, the number of the pressure balance holes (80a) is two, and the two pressure balance holes (80a) are uniformly distributed on the guide sleeve (16) along the circumferential direction of the axis (X). Of course, in the present embodiment, the number of the pressure balance holes (80a) may be three, four, etc., and the specific number of the pressure balance holes (80a) may be set according to actual demand.

Preferably, each of the pressure balance holes (80a) is a circular pressure balance hole. Of course, in other embodiments, the pressure balance holes (80a) may have other shapes. For example, the pressure balance holes (80a) are rectangular or polygonal pressure balance holes.

In another embodiment, as shown in FIG. 4 and FIGS. 30 to 34, the pressure balance channel (80) is installed between the mounting seat (110), the guide sleeve (16), and the nut sleeve (32), and is used to communicate between the inlet (10a) and the inside of the guide sleeve (16), the inside of the mounting seat (110), the inside of the nut sleeve (32), and the inside of the sleeve (40). As a result, the fluid medium pressure of the inlet (10a) and the fluid medium pressure between the inside of the guide sleeve (16), the inside of the mounting seat (110), the inside of the nut sleeve (32), and the inside of the sleeve (40) are balanced.

The pressure balance channel (80) includes a first balance channel (81) and a second balance channel (82). The first balance channel (81) is used to communicate between the inlet (10a) and the inside of the guide sleeve (16), the inside of the screw rod assembly (30), and the inside of the sleeve (40). The second balance channel (82) is used to install the first balance channel (81) so that the inside of the mounting seat (110) and the inside of the mounting seat (110) are communicated. Therefore, the inside of the guide sleeve (16), the inside of the mounting seat (110), the inside of the nut sleeve (32), and the inside of the sleeve (40) and the inlet are communicated with each other through the first balance channel (81) and the second balance channel (82). When the fluid medium flows in from the inlet (10a), a portion of the fluid medium flows into the inside of the guide sleeve (16), the inside of the screw rod assembly (30), and the inside of the sleeve (40) through the first balance channel (81). It flows into the inside of the mounting seat (110) through the second balance channel (82), so that the medium pressure at each point inside the electronic expansion valve (100) becomes the same.

The first balance channel (81) includes a first balance hole (811) and a second balance hole (812). The first balance hole (811) is opened on the guide sleeve (16) and is used to communicate between the inside of the guide sleeve and the valve cavity (12). The second balance hole (812) is opened on the nut sleeve (32) and is used to communicate between the inside of the sleeve (40) and the inside of the nut sleeve (32). Through this, the valve cavity (12) and the inside of the guide sleeve (16), the inside of the nut sleeve (32), and the inside of the sleeve (40) are communicated with each other to achieve the purpose of pressure balance.

In addition, the first balance hole (811) has an axis line, and the axis line of the first balance hole (811) is installed parallel to the axis line (103). The first balance hole (811) is vertically opened on the guide sleeve (16), so that it can be seen that the first balance hole (811) does not affect the fluid medium flow direction and eliminates noise due to changes in the fluid medium flow direction.

Preferably, the number of the first balance holes (811) is two, and the two first balance holes (811) are uniformly distributed on the guide sleeve (16) along the circumferential direction of the axis (103). Of course, in the present embodiment, the number of the first balance holes (811) may be three, four, etc., and the specific number of the first balance holes (811) may be set according to actual demand.

Each of the above first balance holes (811) is a circular pressure balance hole. In other embodiments, the above first balance holes (811) may have other shapes. For example, they may be rectangular or polygonal pressure balance holes.

The second balance hole (812) has an axis, and the axis of the second balance hole (812) is installed perpendicular to the axis of the first balance hole (811). Of course, in other embodiments, the axis of the second balance hole (812) may not be perpendicular to the axis of the first balance hole (811).

The second balance channel (82) includes the third balance hole (821), and the third balance hole (821) is opened on the connecting piece (17). The third balance hole (821) is used to communicate the inside of the mounting sheet (110) and the inside of the sleeve (40), and at the same time, the third balance hole (821) is also used to mount the spring (531). One end of the spring (531) extends into the third balance hole (821). The inside of the mounting sheet (110) and the first balance channel (81) are communicated through the third balance hole (821), and the fluid medium of the inlet (10a) flows into the inside of the mounting sheet (110) through the first balance channel (81) and the third balance channel (821).

Preferably, the third balance hole (821) is a slot hole, and the third balance hole (821) is installed as an opening perpendicular to the axial direction of the valve body. The number of the third balance holes (821) is plural. In the present embodiment, the number of the third balance holes (821) is two, and the two third balance holes (821) are installed symmetrically with respect to the axial direction of the valve body.

As shown in FIGS. 2 and 3, the second balance channel (82) may further include a fourth balance hole (822) and a fifth balance hole (823). The fourth balance hole (822) is opened in the guide sleeve (16), and the fifth balance hole (823) is opened on the nut sleeve (32). The fourth balance hole (822) is communicated with the fifth balance hole (823), and the inside of the guide sleeve (16) and the inside of the mounting seat (110) are communicated through the fourth balance hole (822) and the fifth balance hole (823). Here, by further installing the fourth balance hole (822) and the fifth balance hole (823), the speed at which the medium pressure between the inside of the mounting seat (110) and the inlet (10a) is balanced can be improved.

In addition, the fourth balance hole (822) is opened on the second cylindrical section (163), and the fifth balance hole (823) is opened on the matching section (321). Communication between the mounting hole (111) and the guide hole (16a) is realized through the fourth balance hole (822) and the fifth balance hole (822), thereby realizing communication between the inside of the mounting sheet (110) and the first balance channel (81).

The fourth balance hole (822) above has an axis line and the fifth balance hole (822) also has an axis line. The axis line of the fourth balance hole (822) is installed to overlap with the axis line of the fifth balance hole (822), and the axis line of the fourth balance hole (822) and the axis line of the first balance hole (811) are installed vertically. Of course, in another embodiment, as long as the fourth balance hole (822) and the fifth balance hole (822) are connected, the axis line of the fourth balance hole (822) and the axis line of the fifth balance hole (822) may be installed so as not to overlap, and the axis line of the fourth balance hole (822) and the axis line of the first balance hole (811) may not be vertical.

The technical features of the above-described embodiments can be arbitrarily combined. For the sake of brevity, not all possible combinations of the technical features according to the above-described embodiments have been described, but as long as there is no contradiction in the combination of technical features, they should all be considered within the scope described in the present invention.

The above-described embodiments are intended to illustrate various embodiments of the present invention, and although the description is relatively specific and detailed, it should not be construed as limiting the scope of the patent for the present invention. It should be noted that those skilled in the art in the technical field to which the present invention pertains can perform modifications and improvements without departing from the concept of the present invention, and all of these fall within the protection scope of the present invention. Therefore, the protection scope of the patent for the present invention is based on the appended claims.

Claims (27)

In electronic expansion valves,
A valve body, a guide sleeve, a valve needle assembly, a screw rod assembly and a sleeve, wherein the valve body has an axial line, a valve port, an inlet for introducing a fluid medium and an outlet for discharging a fluid medium are formed on the valve body, one end of the guide sleeve is mounted in the valve body, and the other end extends into the screw rod assembly, the valve needle assembly is mounted in the guide sleeve and moves under the guidance of the guide sleeve to open or close the valve port, the screw rod assembly is at least partially accommodated in the sleeve, and the electronic expansion valve further includes a pressure balance channel, the pressure balance channel communicates the inlet with the inside of the electronic expansion valve, so that the fluid medium pressure of the inlet and the fluid medium pressure inside the electronic expansion valve are balanced.
The screw rod assembly includes a screw rod, a nut sleeve threadedly connected to the screw rod, the nut sleeve having first and second oppositely installed ends, the first end of the nut sleeve is mounted on the valve body, the second end is accommodated within the sleeve, a matching section is provided in the first end of the nut sleeve, and the matching section extends into the interior of the valve body.
A mounting cavity is opened on the above valve body, one end of the guide sleeve is forcefully fitted between the mounting cavity, a matching hole is opened on the matching section, and the other end of the guide sleeve extends from the matching hole into the nut sleeve and is forcefully fitted with the matching hole.
A first balance hole is opened at one end of the guide sleeve to connect the inside of the guide sleeve and the inlet,
An electronic expansion valve characterized in that a fourth balance hole is opened at the other end of the guide sleeve, and a fifth balance hole formed in the matching hole of the nut sleeve is connected to the fourth balance hole, thereby connecting the outside of the matching section with the inside of the guide sleeve. In the first paragraph,
An electronic expansion valve, characterized in that the sleeve is mounted on the valve body. In the second paragraph,
An electronic expansion valve characterized in that the pressure balance channel communicates the inlet with the inside of the guide sleeve, the inside of the screw rod assembly, and the inside of the sleeve, so that the fluid medium pressure of the inlet is balanced with the fluid medium pressures inside the guide sleeve, the inside of the screw rod assembly, and the inside of the sleeve. In the third paragraph,
An electronic expansion valve, characterized in that the pressure balancing channel comprises a first balancing channel, and the first balancing channel is used to communicate the inlet with the interior of the guide sleeve, the interior of the screw rod assembly, and the interior of the sleeve. In paragraph 4,
An electronic expansion valve, characterized in that the first balance channel includes the first balance hole and the second balance hole, and the second balance hole is opened on the screw rod assembly and is used to communicate the inside of the screw rod assembly with the inside of the sleeve. In paragraph 5,
An electronic expansion valve, characterized in that a connecting piece is mounted on the valve body, and one end of the screw rod assembly is mounted on the connecting piece. delete In the first paragraph,
Equipped with an additional mounting sheet,
The above mounting seat is mounted on the valve body,
The above sleeve is mounted on the above mounting sheet,
An electronic expansion valve, characterized in that one end of the screw rod assembly is mounted on the mounting seat. In Article 8,
An electronic expansion valve characterized in that the pressure balance channel communicates the inlet with the inside of the guide sleeve, the inside of the mounting seat, the inside of the screw rod assembly, and the inside of the sleeve, so that the fluid medium pressure of the inlet is balanced with the fluid medium pressures inside the guide sleeve, the inside of the mounting seat, the inside of the screw rod assembly, and the inside of the sleeve. delete delete In Article 9,
An electronic expansion valve characterized in that a connecting piece is mounted on the mounting sheet, one end of the screw rod assembly is mounted on the connecting piece, a third balance hole is opened on the connecting piece, and the third balance hole is used to communicate the inside of the mounting sheet with the inside of the sleeve. delete delete delete In clause 1 or clause 8,
An electronic expansion valve, characterized in that the valve needle assembly includes a valve needle sleeve, a valve needle and a ball, the valve needle is mounted on the valve needle sleeve, one end of the valve needle matches with the screw rod assembly, the other end matches with the valve port, and the ball is installed between the screw rod assembly and the valve needle. In clause 1 or clause 8,
An electronic expansion valve characterized in that a medium inlet pipe and a medium discharge pipe are installed on the valve body, the medium inlet pipe is installed at the inlet, the valve body has a connection groove formed at one end distant from the sleeve, a projection is installed on the groove bottom of the connection groove, the outlet penetrates the projection along the valve body axis, one end of the medium discharge pipe is installed to surround the projection and is accommodated in the connection groove, and the projection and the medium discharge pipe are welded. In clause 1 or clause 8,
An electronic expansion valve characterized in that a valve cavity is provided in the valve body, a guide hole is opened on the guide sleeve, the valve needle assembly is mounted in the guide hole and moves under the guidance of the guide hole to open or close the valve port, a pressure balancing channel is further opened on the guide sleeve, and the pressure balancing channel connects the valve cavity with the guide hole to balance the pressure between the valve cavity and the guide hole. In Article 18,
An electronic expansion valve, characterized in that the pressure balancing channel comprises at least one pressure balancing hole. In Article 19,
An electronic expansion valve, characterized in that the axis of the pressure balance hole is installed parallel to the axis of the guide sleeve. In Article 19,
An electronic expansion valve, characterized in that the number of the pressure balancing holes is two, and the two pressure balancing holes are spaced apart and uniformly installed on the guide sleeve. In Article 21,
An electronic expansion valve, wherein each of the above pressure balancing holes is a circular pressure balancing hole. In Article 19,
An electronic expansion valve characterized in that a position-limiting step is installed on the inner wall of the guide hole, and a pressure balance hole is opened on the position-limiting step. In Article 18,
An electronic expansion valve characterized in that a medium inlet for medium introduction, a medium outlet for medium discharge, and a valve cavity communicating with the medium inlet are opened on the valve body, and the valve port is located between the valve cavity and the medium outlet. In Article 18,
An electronic expansion valve characterized in that the above electronic expansion valve further includes a sleeve and a screw rod assembly, the sleeve being installed to cover the valve body, one end of the screw rod assembly being connected to the valve needle assembly, and the other end being accommodated within the sleeve. In Article 25,
An electronic expansion valve, characterized in that the valve needle assembly includes a valve needle and a valve needle sleeve, the valve needle sleeve is mounted within the guide hole, one end of the valve needle is connected to the screw rod assembly, and the other end is mounted within the valve needle sleeve and is used to match with the valve port. In Article 26,
An electronic expansion valve, characterized in that the above valve needle assembly further includes a valve ball, and the valve ball and the valve needle are connected by welding.