WO2023143026A1 - Electronic expansion valve and processing method for valve seat - Google Patents

Abstract

An electronic expansion valve and a processing method for a valve seat (2). The electronic expansion valve comprises a valve seat (2), an outer cover (1), and a coil (94); the valve seat (2) comprises a first connection part (23) and a second connection part (24), the second connection part (24) and the first connection part (23) being integrally formed; the outer cover (1) is connected to the first connection part (23); and the coil (94) is sleeved at the periphery of the outer cover (1) and is connected to the second connection part (24). The first connection part (23) used for connecting the outer cover (1) and the second connection part (24) used for connecting the coil (94) are configured as an integrally formed structure, enabling coaxiality to be ensured when the first connection part (23) and the second connection part (24) are integrally processed, thereby ensuring the coaxiality of the coil (94) and the valve seat (2) after assembly, and given that coaxiality is ensured, the connections of the coil (94) with the outer cover (1) and the valve seat (2) are more stable. The first connection part (23) and the second connection part (24) being an integrated structure also ensures the connection strength of the two parts.

Description

Processing method of electronic expansion valve and valve seat

cross reference

This disclosure claims the priority of the Chinese patent application with the application number 202210106063.X and the title "processing method of electronic expansion valve and valve seat" filed on January 28, 2022, the entire content of which is incorporated by reference in its entirety Incorporated into this article.

technical field

The present disclosure relates to the technical field of refrigeration systems, in particular, to an electronic expansion valve and a processing method for a valve seat.

Background technique

With the popularization of frequency conversion air conditioners, electronic expansion valves are the main components of frequency conversion air conditioners, and their performance has a great impact on the comfort and energy saving of air conditioners. However, the connection between the coil and the valve seat of the electronic expansion valve in the related art is not stable, and the coil is easy to shake.

Contents of the invention

The embodiments of the present disclosure provide a processing method for an electronic expansion valve and a valve seat, so as to solve the problem of coil instability in the related art.

An electronic expansion valve according to an embodiment of the present disclosure includes a valve seat, an outer cover and a coil, the valve seat includes a first connecting portion and a second connecting portion, the second connecting portion is integrally formed with the first connecting portion; the outer cover and the The first connection part is connected; the coil is sleeved on the outer periphery of the outer cover and connected with the second connection part.

The processing method of the valve seat of the electronic expansion valve according to the embodiment of the present disclosure includes:

The blank of the valve seat is integrally processed and formed, and the blank includes a first connecting part, a second connecting part and a valve core part, the first connecting part is used to connect with the outer cover of the electronic expansion valve, and the first connecting part The second connecting part is used to connect with the coil of the electronic expansion valve;

A connection outer peripheral surface is formed on the first connection part, a valve port is formed on the valve core part, and the connection outer peripheral surface is used for connecting with the outer cover.

The processing method of the valve seat of the electronic expansion valve according to the embodiment of the present disclosure includes:

The first connecting part and the second connecting part of the valve seat are integrally processed and formed, the first connecting part is used for connecting with the outer cover of the electronic expansion valve, and the second connecting part is used for connecting with the electronic expansion valve coil connection;

forming a connecting outer peripheral surface on the first connecting portion;

A valve core part with a valve port is molded, and the valve core part is assembled with the first connecting part.

One embodiment of the above invention has at least the following advantages or beneficial effects:

Compared with the solution in the related art where the part connected to the coil and the part connected to the outer cover are separate structures, the electronic expansion valve in the embodiment of the present disclosure uses the first connecting part for connecting the outer cover and the part for connecting The second connecting part of the coil is provided with an integrally formed structure, so that the first connecting part and the second connecting part can ensure coaxiality during integral processing, thereby ensuring the coaxiality of the coil and the valve seat after assembly. On the basis of this, the connection between the coil, the outer cover and the valve seat is more stable. In addition, the integrated structure of the first connecting part and the second connecting part also ensures the connection strength of the two.

Description of drawings

FIG. 1 shows a cross-sectional view of an electronic expansion valve according to a first embodiment of the present disclosure.

Fig. 2 shows a perspective view of the valve seat of the first embodiment of the present disclosure.

Fig. 3 shows a cross-sectional view of the valve seat of the first embodiment of the present disclosure.

Fig. 4 is a perspective view of the valve seat of the second embodiment of the electronic expansion valve of the first embodiment of the present disclosure.

FIG. 5 is a cross-sectional view of an electronic expansion valve according to a second embodiment of the present disclosure.

Fig. 6 shows a perspective view of the first connection part and the second connection part of the electronic expansion valve according to the second embodiment of the present disclosure.

Fig. 7 shows a cross-sectional view of the first connection part and the second connection part of the electronic expansion valve according to the second embodiment of the present disclosure.

8 and 9 show cross-sectional views of different molding processes of the valve seat of the first embodiment of the present disclosure.

Wherein, the reference signs are explained as follows:

1. Outer cover

13. Chamber

2. Valve seat

21. Valve port

22. Concave

221. Bottom

222. Side

23. The first connecting part

231. Straight section

232. Boss section

234. Connect the outer peripheral surface

235. Connection section

236. Horizontal hole

24. The second connecting part

241. Connection structure

25. Through hole

26. Spool part

261. Sleeve Department

3. Nut seat

4. Screw rod

41. Accommodating tank

42. Mobile set

421: flange

43. Plug

44. Locking parts

45. Accommodating cavity

5. Valve needle

6. Magnetic rotor

7. Stop component

71. Around the column

72. Spring guide rail

73. Stop ring

74. Connector

75. The second stopper

76. The first stopper

81. Elastic parts

82. Balance channel

83. Middleware

91. The first connecting pipe

92. Second connecting pipe

93. Limiting parts

94. Coil

941: Reed

Detailed ways

Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed descriptions will be omitted.

As shown in Fig. 1, Fig. 1 shows a cross-sectional view of the electronic expansion valve according to the embodiment of the present invention. The electronic expansion valve of the embodiment of the utility model includes an outer cover 1 , a coil 94 , a valve seat 2 , a nut seat 3 , a screw rod 4 , a valve needle 5 and a magnetic rotor 6 .

It can be understood that the terms "comprising" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but optionally also includes unlisted steps or units, or optionally further includes For other steps or components inherent in those processes, methods, products, or devices.

The valve seat 2 is connected with the housing 1 and together with the housing 1 forms a chamber 13 . The valve seat 2 has a valve port 21 and a recess 22 corresponding to the valve port 21 . The coil 94 is provided on the outer periphery of the housing 1 .

The nut seat 3 is arranged in the cavity 13 and is arranged in the recess 22 . The screw rod 4 is arranged in the chamber 13 and screwed with the nut seat 3 . The valve needle 5 is connected with the threaded rod 4 for cooperating with the valve port 21 to adjust the opening of the valve port 21 . The magnetic rotor 6 is arranged in the chamber 13 and connected inductively with the coil 94 and connected with the screw 4 .

When the coil 94 is energized, the magnetic rotor 6 can rotate around its own axis, thereby driving the threaded mandrel 4 to rotate synchronously. When the threaded rod 4 and the nut seat 3 rotate relative to each other through the thread structure, the threaded rod 4 can move axially relative to the nut seat 3 , and then drive the valve needle 5 to move in the axial direction to realize the adjustment of the opening of the valve port 21 .

The valve seat 2 is also connected with the first connecting pipe 91 and the second connecting pipe 92 . The valve port 21 of the valve seat 2 is disposed between the first connecting pipe 91 and the second connecting pipe 92 . When the valve needle 5 blocks the valve port 21 , the first connecting pipe 91 and the second connecting pipe 92 are not connected. When the valve needle 5 is not blocking the valve port 21 , the first connecting pipe 91 and the second connecting pipe 92 are connected.

In one embodiment, the valve seat 2 can be a metal piece.

The nut seat 3 also has a balance channel 82 , and the balance channel 82 runs through the inner and outer peripheral surfaces of the nut seat 3 .

Through the arrangement of the balance passage 82, the space in the valve seat 2 can be communicated with the chamber 13, so that the valve needle 5 will not be subjected to resistance due to air pressure imbalance during the axial movement.

The screw rod 4 also includes a receiving groove 41 . The electronic expansion valve also includes an elastic member 81, which is arranged in the receiving groove 41, and one end of the elastic member 81 abuts against the groove bottom of the accommodating groove 41, and the other end abuts against the valve needle 5, so that the valve needle 5 has Trend away from lead screw 4. One end of the valve needle 5 is defined in the receiving groove 41 .

By arranging the elastic member 81 between the screw rod 4 and the valve needle 5, the valve needle 5 and the screw rod 4 can be in soft contact instead of hard contact. When the screw rod 4 drives the valve needle 5 to block the valve port 21, due to the action of the elastic member 81, when the screw rod 4 continues to move downward, the valve needle 5 will not continue to move downward, but will compress the elastic 81, so as to ensure that the valve needle 5 will not be locked on the valve port 21, and the screw rod 4 and the nut seat 3 will not be screwed into lock. In this way, when moving in the opposite direction, the screw rod 4 and the nut seat 3 can still rotate easily, and then drive the valve needle 5 to move upwards to open the valve port 21 .

In one embodiment, the elastic member 81 is a compression spring, but not limited thereto.

In one embodiment, the electronic expansion valve further includes a limiting member 93 , and the limiting member 93 is disposed on the groove wall of the receiving groove 41 and adjacent to the notch of the receiving groove 41 . One end of the valve needle 5 is provided with a flange, and the flange cooperates with the stopper 93 to limit the end of the valve needle 5 with the flange in the receiving groove 41 to prevent the valve needle 5 from coming out of the receiving groove 41 .

For example, the limiting member 93 may be in the shape of a sleeve, the outer wall of which is connected to the groove wall of the receiving groove 41 and sleeved on the outer periphery of the valve needle 5 .

The electronic expansion valve of the embodiment of the utility model further includes a stopper assembly 7, which is arranged in the chamber 13 and connected to the cover 12, and is used to limit the movement range of the screw rod 4 in the axial direction.

The stop assembly 7 includes a post 71 , a spring rail 72 , a stop ring 73 and a connecting piece 74 . One end of the post 71 is connected to the inner surface of the top wall of the housing 1 and extends in the axial direction. The spring rail 72 is helically wound around the outer circumference of the column 71 , and two ends of the spring rail 72 respectively have a first stop portion 76 and a second stop portion 75 . The connecting piece 74 is connected with the screw rod 4 . The retaining ring 73 abuts against the connecting member 74 and is helically wound around the outer periphery of the post 71 . At the same time, the stop ring 73 can spirally move in the spiral groove formed by the spring guide rail 72 .

When the threaded mandrel 4 rotates around its own axis, the stop ring 73 coils along the helical groove of the spring rail 72 . During the movement of the screw rod 4 towards the cover 12 , when the stop ring 73 touches the first stop portion 76 , it means that the screw rod 4 has moved to the upper limit point, and the screw rod 4 cannot continue to move upward at this time. When the threaded rod 4 moves away from the cover 12 , when the stop ring 73 touches the second stop portion 75 , it means that the threaded rod 4 has moved to the lower limit point, and the threaded rod 4 cannot continue to move downwards at this time.

As shown in FIG. 2 and FIG. 3 , FIG. 2 shows a perspective view of the valve seat 2 according to the first embodiment of the present disclosure. Fig. 3 shows a cross-sectional view of the valve seat 2 of the first embodiment of the present disclosure. The valve seat 2 of the embodiment of the present disclosure includes a first connecting portion 23 and a second connecting portion 24 , and the second connecting portion 24 is integrally formed with the first connecting portion 23 .

The first connecting portion 23 is connected to the housing 1 , for example, by laser welding, but not limited thereto. The second connecting portion 24 is connected to the coil 94 , for example, by snap-fitting, but not limited thereto.

Compared with the solution in the related art where the part connected to the coil and the part connected to the housing are separate structures, the electronic expansion valve in the embodiment of the present disclosure uses the first connecting part 23 for connecting the housing 1 and the The second connection part 24 connecting the coil is provided with an integrated structure, so that the first connection part 23 and the second connection part 24 can ensure coaxiality when integrally processed, thereby ensuring the coaxiality of the coil and the valve seat 2 after assembly, On the basis of ensuring the coaxiality, the connection between the coil and the outer cover 1 and the valve seat 2 is more stable. In addition, the integrated structure of the first connecting part 23 and the second connecting part 24 also ensures the connection strength of the two.

The first connecting portion 23 has a cylindrical structure, and the second connecting portion 24 is disposed on the outer peripheral surface of the first connecting portion 23 and extends radially outward.

It can be understood that "cylindrical structure" should be understood as not a straight cylindrical shape, but also a cylindrical shape with a stepped outer peripheral surface.

The second connecting portion 24 may be in the shape of a ring, and surround the outer peripheral surface of the first connecting portion 23 along the circumferential direction of the first connecting portion 23 .

As shown in FIG. 1 and FIG. 2 , the second connecting portion 24 includes a connecting structure 241 for engaging with the reed 941 of the coil 94 . The number of connection structures 241 may be multiple.

In this embodiment, the connecting structure 241 includes a through hole penetrating through the second connecting portion 24 along the thickness direction. A plurality of through holes may be arranged at intervals along the circumferential direction. When the coil 94 was installed on the second connection part 24, the contacts of the reed 941 of the coil 94 could extend into the through hole from the bottom surface of the second connection part 24, thereby limiting the coil 94 and the valve seat 2 in the axial direction, preventing The coil is disengaged from the valve seat 2 in the axial direction.

The concave portion 22 of the valve seat 2 is disposed on the first connecting portion 23 and includes a bottom portion 221 and a side portion 222 , the side portion 222 surrounds an outer edge of the bottom portion 221 and extends axially upward. The bottom 221 of the valve seat 2 also has a through hole 25 along the thickness direction, and the valve needle 5 passes through the through hole 25 .

The valve seat 2 further includes a valve core part 26 integrally formed with the first connecting part 23 , and the valve core part 26 has a valve port 21 . The valve needle 5 cooperates with the valve port 21 to adjust the opening degree of the valve port 21 . The valve core part 26 and the first connecting part 23 can be integrally processed by forging and/or upsetting.

It can be understood that the valve core part 26 with the valve port 21 is integrally structured with the first connecting part 23 and the second connecting part 24, that is to say, the first connecting part 23, the second connecting part 24 and the valve core part 26 It may be formed in one piece, for example by forging and/or upsetting.

The first connecting portion 23 includes a straight section 231 and a boss section 232 . The valve core 26 is disposed at one end of the straight section 231 , and the valve port 21 communicates with the inside of the straight section 231 . The boss section 232 is disposed on the other end of the straight section 231 . The boss section 232 is connected to the housing 1 , and the second connecting portion 24 is wound around the outer peripheral surface of the boss section 232 . The recess 22 is disposed on the boss section 232 .

The boss section 232 has a connecting outer peripheral surface 234 formed by cutting. The housing 1 is sheathed on the connecting outer peripheral surface 234 , and the outer peripheral surface of the housing 1 is flush with the outer peripheral surface of the boss section 232 .

In one embodiment, the outer cover 1 and the boss section 232 may be connected by laser welding, but it is not limited thereto.

It can be understood that the size of the connecting outer peripheral surface 234 along the axial direction is the combined size of the outer cover 1 and the boss section 232 . The connecting outer peripheral surface 234 is obtained by cutting, on the one hand, the cutting accuracy can be controlled, so that the connecting outer peripheral surface 234 is precisely connected with the outer cover 1, the positioning of the outer cover 1 is realized, and the coaxiality between the valve seat 2 and the outer cover 1 is ensured; On the one hand, the axial dimension of the connecting outer peripheral surface 234 can be controlled, thereby ensuring the connection strength between the housing 1 and the boss section 232 .

Part of the valve core 26 is disposed inside the straight section 231 , and another part of the valve core 26 protrudes from the straight section 231 . The part of the valve core 26 protruding from the straight section 231 can be used to connect to the first connecting pipe 91 .

As shown in Fig. 8 and Fig. 9, Fig. 8 and Fig. 9 show cross-sectional views of different molding processes of the valve seat 2 according to the first embodiment of the present disclosure. The first connecting portion 23 and the second connecting portion 24 are integrally processed by forging and/or upsetting.

As shown in FIG. 8 , the blank of the valve seat 2 can be integrally formed by forging and/or upsetting, and the blank can include a first connecting portion 23 , a second connecting portion 24 and a valve core portion 26 . Since the first connecting portion 23, the second connecting portion 24 and the valve core portion 26 are integrally formed, the coaxiality between the second connecting portion 24 and the first connecting portion 23 is relatively high, so that the coil 94 is assembled with the valve seat 2 Concentricity is guaranteed. In a vibrating environment, the coil is more stably connected to the valve seat 2 and is not easy to come out in the axial direction. In the related art, the part used to connect the coil and the part used to connect the cover are separate structures, and are connected by welding. The part used to connect the coil and the part used to connect the cover are loosely fitted, and the two There is a gap between the two, which makes the coaxiality between the two difficult to control, and is prone to deflection during welding.

As shown in Figure 9, after the blank of the valve seat 2 is integrally formed by forging and/or upsetting, the horizontal hole 236 and the concave portion 22 can be preliminarily processed by punching, machining, etc., and the horizontal hole 236 is used For connecting the second connecting pipe 92, the concave portion 22 is used for connecting the nut seat.

Finally, the valve port 21, the connecting outer peripheral surface 234 and the concave portion 22 are formed by a numerical control machining center. Since the valve port 21 , connecting the outer peripheral surface 234 and the concave portion 22 can be completed in one clamping without changing the clamping method, the coaxiality of the valve port 21 , the connecting peripheral surface 234 and the concave portion 22 is ensured.

As shown in FIG. 4 , FIG. 4 shows a perspective view of the valve seat 2 of the second embodiment of the electronic expansion valve of the first embodiment of the present disclosure. The similarities between the valve seat 2 of the second embodiment and the valve seat 2 of the first embodiment will not be repeated, and the difference lies in the connection structure 241 on the second connection part 24 .

Specifically, the connecting structure 241 is a notch penetrating through the outer peripheral surface of the second connecting portion 24 . A plurality of notches may be arranged at intervals along the circumferential direction. The notch can cooperate with the reed 941 of the coil to realize snap-in.

Of course, it can be understood that the connection structure 241 may also be through holes and notches, and multiple through holes and multiple notches may be arranged alternately along the circumferential direction.

As shown in FIGS. 5 to 7 , FIG. 5 shows a cross-sectional view of the electronic expansion valve according to the second embodiment of the present disclosure. FIG. 6 shows a perspective view of the first connection part 23 and the second connection part 24 of the electronic expansion valve according to the second embodiment of the present disclosure. FIG. 7 shows a cross-sectional view of the first connecting portion 23 and the second connecting portion 24 of the electronic expansion valve according to the second embodiment of the present disclosure. The similarities between the electronic expansion valve of the second embodiment and the electronic expansion valve of the first embodiment will not be repeated, and the difference lies in:

The electronic expansion valve in this embodiment includes a housing 1 , a coil, a valve seat 2 , a nut seat 3 , a screw rod 4 , a valve needle 5 and a magnetic rotor 6 . The housing 1 is connected with the valve seat 2 and jointly forms a cavity 13 . The valve seat 2 has a valve port 21 and a recess 22 corresponding to the valve port 21 . The coil is provided on the outer periphery of the housing 1 .

The nut seat 3 is disposed in the chamber 13 and connected to the first connecting portion 23 through an intermediate piece 83 . The screw rod 4 is arranged in the chamber 13 and screwed with the nut seat 3 . The valve needle 5 is connected with the threaded rod 4 for cooperating with the valve port 21 to adjust the opening of the valve port 21 . The magnetic rotor 6 is arranged in the chamber 13 and is inductively connected with the coil and connected with the screw rod 4 .

The valve seat 2 includes a first connecting portion 23, a second connecting portion 24 and a valve core portion 26, the second connecting portion 24 is integrally formed with the first connecting portion 23, the valve core portion 26 is connected with the first connecting portion 23, and is connected with the second connecting portion 23. A connecting portion 23 is a split structure.

The first connecting portion 23 includes a straight section 231 and a connecting section 235 , and the second connecting portion 24 is wound around the outer peripheral surface of the straight section 231 . The connection section 235 is connected to one end of the straight section 231 and extends radially inward, and the connection section 235 is connected to the valve core 26 .

One end of the straight section 231 has a connecting outer peripheral surface 234 formed by cutting, the outer cover 1 is sheathed on the connecting outer peripheral surface 234 , and the outer peripheral surface of the outer cover 1 is flush with the outer peripheral surface of the straight section 231 .

When processing the valve seat 2 of this embodiment, the integrally formed parts of the first connecting portion 23 and the second connecting portion 24 can be processed separately, and the valve core portion 26 can be processed separately. After that, the component composed of the first connecting portion 23 and the second connecting portion 24 is assembled with the valve core portion 26 .

Specifically, the first connecting portion 23 and the second connecting portion 24 can be integrally formed by forging and/or upsetting with reference to the processing methods shown in FIG. 8 and FIG. 9 . Afterwards, the horizontal hole 236 and the concave portion 22 are initially processed by punching, machining, etc., and finally the connecting outer peripheral surface 234 and the concave portion 22 are formed by a numerically controlled machining center. Similarly, the connection between the outer peripheral surface 234 and the concave portion 22 can be completed in one clamping without changing the clamping method, which ensures the coaxiality of the connection between the outer peripheral surface 234 and the concave portion 22 .

The electronic expansion valve also includes a moving sleeve 42 , a plug 43 and a locking member 44 . The moving sleeve 42 is movably engaged with the spool portion 26 . One end of the moving sleeve 42 is provided with a flange 421 , and the flange 421 extends inward along the radial direction of the moving sleeve 42 so that one end of the moving sleeve 42 forms a constriction structure. The other end of the moving sleeve 42 is fixedly connected with the plug 43 . The plug 43 and the moving sleeve 42 jointly form a receiving cavity 45 . One end of the valve needle 5 is limited in the accommodating chamber 45 by the flange 421 of the moving sleeve 42, so that one end of the valve needle 5 can move in the accommodating chamber 45, but cannot break away from the accommodating chamber 45.

The plug 43 is provided with a perforation, and the threaded rod 4 is movably penetrated through the perforation of the plug 43 . The locking member 44 is fixedly connected to one end of the screw rod 4 , and abuts against the inner wall of the plug 43 in a detachable manner. One end of the elastic member 81 abuts against the valve needle, and the other end abuts against the locking member 44 , so that the valve needle 5 tends to move away from the locking member 44 .

It can be understood that the elastic member 81 may be a compression spring, but not limited thereto.

When the valve needle 5 is not in contact with the valve port 21, the screw rod 4 drives the moving sleeve 42 to move axially relative to the valve core portion 26, and under the action of the elastic member 81, the valve needle 5 and the flange 421 of the moving sleeve 42 contact, but cannot break away from the accommodating cavity 45 . When the valve needle 5 is in contact with the valve port 21, the valve needle 5 cannot continue to move downward, but the screw rod 4 will still drive the moving sleeve 42 to move downward. At this time, the elastic member 81 is compressed, so as to ensure that the valve needle 5 will not be locked on the valve port 21, and the threaded rod 4 and the nut seat 3 will not be screwed. In this way, when moving in the opposite direction, the screw rod 4 and the nut seat 3 can still rotate easily, and then drive the valve needle 5 to move upwards to open the valve port 21 .

The spool portion 26 has a sleeve portion 261 , and the moving sleeve 42 is movably arranged in the sleeve portion 261 in the axial direction.

It can be understood that the various embodiments/implementations provided in the present disclosure can be combined with each other if no contradiction arises, and will not be illustrated here one by one.

In the embodiments of the invention, the terms "first", "second", and "third" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; the term "plurality" refers to two or two more than one, unless otherwise expressly limited. The terms "installation", "connection", "connection", "fixed" and other terms should be interpreted in a broad sense, for example, "connection" can be fixed connection, detachable connection, or integral connection; "connection" can be directly or indirectly through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the invention according to specific situations.

In the description of the embodiments of the invention, it should be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "front", "rear" are based on those shown in the accompanying drawings. Orientation or positional relationship is only for the convenience of describing the embodiment of the invention and simplifying the description, and does not indicate or imply that the device or unit referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, cannot be understood as the implementation of the invention Example limitations.

In the description of this specification, descriptions of the terms "one embodiment", "some embodiments", "specific embodiments" and the like mean that specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in the implementation of the invention. In at least one embodiment or example of an example. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above are only preferred embodiments of the embodiments of the invention, and are not intended to limit the embodiments of the invention. For those skilled in the art, the embodiments of the invention can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the embodiments of the invention shall be included within the scope of protection of the embodiments of the invention.

Claims (19)

An electronic expansion valve, characterized in that it comprises: The valve seat includes a first connection part and a second connection part, and the second connection part is integrally formed with the first connection part; an outer cover connected to the first connecting portion; and The coil is sheathed on the outer periphery of the outer cover and connected to the second connection part. The electronic expansion valve according to claim 1, wherein the second connection part includes a connection structure, and the connection structure is used to engage with the reed of the coil. The electronic expansion valve according to claim 2, wherein the connecting structure includes a through hole penetrating through the second connecting part along the thickness direction; and/or a gap penetrating the outer peripheral surface of the second connecting part . The electronic expansion valve according to claim 1, wherein the valve seat further includes a valve core part, the valve core part is integrally formed with the first connecting part, and the valve core part has a valve port; The electronic expansion valve further includes a valve needle, and the valve needle cooperates with the valve port to adjust the opening of the valve port. The electronic expansion valve according to claim 4, wherein the first connecting part comprises: a straight section, the valve core is arranged at one end of the straight section, and the valve port communicates with the inside of the straight section; The boss section is arranged at the other end of the straight tube section; the boss section is connected to the outer cover, and the second connection part is wound around the outer peripheral surface of the boss section. The electronic expansion valve according to claim 5, wherein the boss section has a connecting outer peripheral surface processed by cutting, and the outer cover is sleeved on the connecting outer peripheral surface. The electronic expansion valve according to claim 1, wherein the valve seat further includes a valve core part, the valve core part is connected to the first connecting part, and is separated from the first connecting part structure; the valve core has a valve port; The electronic expansion valve further includes a valve needle, and the valve needle cooperates with the valve port to adjust the opening of the valve port. The electronic expansion valve according to claim 7, wherein the first connection part comprises: a straight section, the second connecting portion is wound around the outer peripheral surface of the straight section; The connection section is connected to one end of the straight cylinder section and extends radially inward; the connection section is connected to the valve core. The electronic expansion valve according to claim 8, wherein one end of the straight section has a connecting outer peripheral surface processed by cutting, and the outer cover is sleeved on the connecting outer peripheral surface. The electronic expansion valve according to claim 1, wherein the first connecting portion and the second connecting portion are integrally processed by forging and/or upsetting. A method for processing a valve seat of an electronic expansion valve, comprising: The blank of the valve seat is integrally processed and formed, and the blank includes a first connecting part, a second connecting part and a valve core part, the first connecting part is used to connect with the outer cover of the electronic expansion valve, and the first connecting part The second connecting part is used to connect with the coil of the electronic expansion valve; A connection outer peripheral surface is formed on the first connection part, a valve port is formed on the valve core part, and the connection outer peripheral surface is used for connecting with the outer cover. The processing method of the valve seat of the electronic expansion valve according to claim 11, characterized in that, the connecting peripheral surface and the valve port are formed in one clamping. The method for processing the valve seat of an electronic expansion valve according to claim 11, wherein the method further comprises: While forming the connecting outer peripheral surface and the valve port, a recess is formed on the first connecting portion by a cutting process, and the recess is used for connecting with the nut seat of the electronic expansion valve. The method for processing the valve seat of the electronic expansion valve according to claim 11, characterized in that the blank of the valve seat is integrally processed and formed, including: The blank of the valve seat is integrally formed by forging and/or upsetting. The method for processing the valve seat of an electronic expansion valve according to claim 11, characterized in that forming a connecting outer peripheral surface on the first connecting part and forming a valve port on the valve core part, comprising: A connection outer peripheral surface is formed on the first connection part by a cutting process, and a valve port is formed on the valve core part. A method for processing a valve seat of an electronic expansion valve, comprising: The first connecting part and the second connecting part of the valve seat are integrally processed and formed, the first connecting part is used for connecting with the outer cover of the electronic expansion valve, and the second connecting part is used for connecting with the electronic expansion valve coil connection; forming a connecting outer peripheral surface on the first connecting portion; A valve core part with a valve port is molded, and the valve core part is assembled with the first connecting part. The method for processing the valve seat of an electronic expansion valve according to claim 16, characterized in that, while forming the connecting outer peripheral surface, an upper concave portion is formed on the first connecting portion by a cutting process, and the concave portion is used for Connect with the nut seat of the electronic expansion valve. The method for processing the valve seat of an electronic expansion valve according to claim 16, wherein the first connecting portion and the second connecting portion of the valve seat are integrally processed and formed, including: The first connecting portion and the second connecting portion of the valve seat are integrally formed by forging and/or upsetting. The method for processing the valve seat of an electronic expansion valve according to claim 16, wherein forming a connection outer peripheral surface on the first connection part includes: A connecting outer peripheral surface is formed on the first connecting portion through a cutting process.

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