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CN113280121A - Electric valve - Google Patents

Electric valve Download PDF

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Publication number
CN113280121A
CN113280121A CN202010104728.4A CN202010104728A CN113280121A CN 113280121 A CN113280121 A CN 113280121A CN 202010104728 A CN202010104728 A CN 202010104728A CN 113280121 A CN113280121 A CN 113280121A
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China
Prior art keywords
valve
port
valve core
diameter
cavity
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Granted
Application number
CN202010104728.4A
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Chinese (zh)
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CN113280121B (en
Inventor
不公告发明人
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Sanhua Intelligent Controls Co Ltd
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Zhejiang Sanhua Intelligent Controls Co Ltd
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Priority to CN202010104728.4A priority Critical patent/CN113280121B/en
Publication of CN113280121A publication Critical patent/CN113280121A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/02—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with screw-spindle
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/32—Details
    • F16K1/34—Cutting-off parts, e.g. valve members, seats
    • F16K1/36—Valve members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/047—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/50—Mechanical actuating means with screw-spindle or internally threaded actuating means
    • F16K31/508—Mechanical actuating means with screw-spindle or internally threaded actuating means the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Electrically Driven Valve-Operating Means (AREA)
  • Lift Valve (AREA)
  • Magnetically Actuated Valves (AREA)

Abstract

An electric valve comprises a driving part, a transmission part, a valve core and a valve seat; the electric valve is also provided with an upper cavity and a lower cavity, the transmission part is positioned in the upper cavity, and the lower cavity is formed in the valve seat; the driving part drives the transmission part to move, the transmission part drives the valve core to move, and the valve core can move up and down along the shaft; the valve core comprises a side wall part and a top part, and is provided with a communication hole which is communicated with the upper cavity and the valve core cavity; the valve core is under the action of the pulling force or the pushing force of the transmission part; the structure of the electric valve can be simplified, and the reduction of the product manufacture is facilitated.

Description

Electric valve
Technical Field
The present invention relates to an electrically operated valve.
Background
The electric valve is applied to a heat pipe system and can cut off a refrigerant or adjust the flow; how to simplify the structure of the electric valve and reduce the manufacturing cost of the product.
Disclosure of Invention
The invention aims to provide an electric valve to simplify the product structure and reduce the manufacturing cost of the product.
In order to achieve the purpose, the invention adopts the following technical scheme: an electric valve comprises a driving part, a transmission part, a valve core and a valve seat; the electric valve is also provided with an upper cavity and a lower cavity, the transmission part is positioned in the upper cavity, and the lower cavity is formed in the valve seat; the driving part drives the transmission part to move, the transmission part drives the valve core to move, and the valve core can move up and down along an axis; the valve seat is provided with a valve port, a first port and a second port, the valve port is positioned between the first port and the second port, the first port is communicated with the lower cavity, and the second port is communicated with the lower cavity through the valve port; the valve core comprises a side wall part and a top part, the valve core is provided with a valve core cavity, the side wall part and the top part surround the valve core cavity, the electric valve is provided with a communication hole, and the communication hole is communicated with the upper cavity and the valve core cavity; the valve core is under the action of the pulling force or the pushing force of the transmission component.
According to the electric valve in the technical scheme, the transmission part only applies acting force to the valve core in one direction by improving the connection mode of the transmission part and the valve core; the valve core is only acted by the screw rod in one direction, after the working medium is introduced, the valve core moves along the axial direction along with the transmission component under the action of resultant force opposite to the acting force, and the valve port is opened or closed, so that the function of adjusting the flow is realized, the structure of the electric valve is simplified, and the manufacturing cost of the product is reduced.
Drawings
Figure 1 is a schematic cross-sectional view of one embodiment of an electrically operated valve of the present invention;
fig. 2 is a schematic view of the electric valve of fig. 1 with the stator part and the first and second connectors removed;
FIG. 3 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 1 with the first port as the inlet port;
FIG. 4 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 1 with the second port as the inlet end;
figure 5 is a schematic cross-sectional view of a second embodiment of the electrically operated valve of the present invention;
fig. 6 is a schematic view of the electric valve of fig. 5 with the stator part and the first and second connectors removed;
FIG. 7 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 5 with the second port as the inlet end;
FIG. 8 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 5 with the first port as the inlet port;
figure 9 is a schematic cross-sectional view of a third embodiment of an electrically operated valve of the present invention;
fig. 10 is a schematic view of the electric valve of fig. 9 with the stator part and the first and second connectors removed;
FIG. 11 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 9 with the first port as the inlet port;
FIG. 12 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 9 with the second port as the inlet port;
figure 13 is a schematic cross-sectional view of a fourth embodiment of the electrically operated valve of the present invention;
fig. 14 is a schematic view of the electric valve of fig. 13 with the stator part and the first and second nozzles removed;
figure 15 is a force analysis diagram of the valve spool of the electrically operated valve of figure 13 with the first port as the inlet port;
FIG. 16 is a force analysis diagram of the valve core of the electrically operated valve of FIG. 13 with the second port as the inlet end
FIG. 17 is a schematic cross-sectional view of the combination of the connecting seat and the valve seat.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments:
in a refrigeration system, a valve device is required to be installed in a refrigerant circuit to cut off or adjust a refrigerant flow rate, and in order to improve the control accuracy of the flow rate, an electrically driven valve device, hereinafter referred to as an electrically operated valve, is used.
Referring to fig. 1 to 17, the electric valve 10 includes a driving portion, a transmission member 3, a valve core 4, and a valve seat 5; in the present embodiment, the drive unit includes the stator member 1 and the rotor member 2, but may have other drive configurations, such as magnetic drive. The electric valve 10 is provided with an upper cavity 101 and a lower cavity 102, the transmission part 3 is positioned in the upper cavity 101, the valve seat 5 forms the lower cavity 102, and the stator part 1 is positioned on the periphery of the rotor part 2; the electric valve is provided with a valve port 51, a first port 52 and a second port 53, wherein the valve port 51 is positioned between the first port 52 and the second port 53, the first port 52 is communicated with the lower cavity 102, and the second port 53 is communicated with the lower cavity 102 through the valve port 51; in this embodiment, the valve port 51, the first port 52 and the second port 53 are formed on the valve seat 5, but the valve port 51, the first port 52 and the second port 53 may also be formed separately from the valve seat and then connected or communicated with the valve seat; (ii) a The electric valve further comprises a first connecting pipe 91 and a second connecting pipe 92, the first connecting pipe 91 is communicated with the first port 52, and the second connecting pipe 92 is communicated with the second port 53; stator part 1 lets in through terminal 93 and produces the excitation magnetic field after circular telegram according to certain law, and rotor part 2 rotates in the excitation magnetic field, and drive unit 3 converts the rotation of rotor part into the axial displacement of case, and the relative valve port motion of case for the case closes or opens the valve port, and then can cut off the refrigerant or adjust the flow size.
In order to simplify the structure of the electric valve, the valve core is only limited by the acting force of the transmission component in one direction upwards or downwards, and the other direction is not limited by the acting force of the transmission component, so that the connection structure of the valve core and the transmission component is simplified, and the cost is reduced.
In the following embodiments, in one of the embodiments, the end of the transmission component 3 abuts against the outer side of the valve core 4, the end of the transmission component 3 applies a downward pushing force to the valve core 4, the transmission component 3 can move downward, the transmission component 3 can push the valve core 4 to move downward, if no working medium is introduced, the transmission component 3 moves upward, the valve core 4 cannot move upward along with the transmission component 3, and in order to ensure that the valve core 4 moves upward, after the working medium is introduced, the resultant force exerted on the valve core 4 after the working medium is acted is ensured to move upward; in another embodiment, the tail end of the transmission part 3 is abutted against the inner side of the valve core 4, the tail end of the transmission part 3 applies upward pulling force to the valve core 4, the transmission part 3 moves upward, the transmission part 3 drives the valve core 4 to move upward, if no working medium is introduced, the transmission part 3 moves downward, the valve core 4 cannot move downward under the action of gravity and friction force, and in order to ensure that the valve core 4 moves downward, after the working medium is introduced, the resultant force applied to the valve core 4 is ensured to be downward.
The spool 4 includes a side wall portion 41 and a top portion 42, both of which surround a spool chamber 43; the top part 42 is provided with a communication hole 421 for communicating the upper cavity 101 and the spool cavity 43, so that the pressures of the upper cavity 101 and the spool cavity 34 are balanced, namely the pressure of the upper cavity is the same as that of the spool cavity, and the first pressure is a first pressure P1; the valve core 4 further comprises a contact part 43, the contact part 43 is matched with the valve port 51 in a shape and can close the valve port 51, and the contact part 43 is in an inclined plane or cambered surface structure; the outer diameter of the abutting part is gradually increased from the free end of the abutting part to the outer side face of the side wall part, and at least part of the abutting part is located in the lower cavity.
In this embodiment, the electric valve further includes a connecting seat 50, in this embodiment, the connecting seat 50 and the valve seat 5 are integrally formed by furnace welding, although the connecting seat 50 and the valve seat 5 may be integrally formed. The diameters indicated below refer to corresponding structures that are circular, and when corresponding structures are non-circular, corresponding equivalent diameters.
Fig. 1 to 4 are schematic diagrams of an embodiment of an electric valve, in this embodiment, an electric valve 10 includes a stator component 1, a rotor component 2, a transmission component 3, and a valve core 4, the stator component 1 drives the rotor component 2 to rotate, the rotor component 2 drives the transmission component 3 to move axially, the transmission component 3 pushes the valve core 4 to close a valve port 51 downward when moving downward, and when the transmission component 3 moves upward, the valve core 4 is acted by upward resultant force of a working medium and moves upward synchronously with the transmission component 3, so as to gradually open the valve port and adjust a flow rate passing through the valve port.
In this embodiment, the stator component 1 is located at the periphery of the rotor component 2 and isolated by the cover 6, the cover 6 forms an upper cavity 101, and the rotor component 2 is located in the upper cavity 101; an excitation magnetic field is formed around the electrified stator part 1 to drive the rotor part 2 to rotate; the transmission part 3 comprises a screw 31 and a nut 32; the screw 31 is fixedly connected with the rotor part 2, and the outer wall of the screw 31 is provided with an external thread which is matched with the nut 32 through threads so as to convert the rotation of the rotor part 2 into axial up-and-down movement; the bottom end of the screw 31 can be abutted against the outer surface of the top part 41 of the valve core 4, and when the screw 31 moves downwards along the axial direction, the valve core 4 is pushed to move downwards to close the valve port or reduce the opening degree of the valve port.
Referring to fig. 1, 2, 3 and 4, in the present embodiment, the lateral wall of the valve core 4 has a circular cross-section, and the diameter of the outer edge of the lateral wall 41 is the first diameter D1The diameter of the valve port 51 is a second diameter D2First diameter D1Is larger than the second diameter D2The valve core 4 is tightly fitted with the valve port 51, and referring to fig. 2 and 3, in the state that the valve core 4 is tightly fitted with the valve port 51, a medium is introduced from the first port 52, a lower cavity part filled with a working medium is defined as a valve cavity, and the pressure formed in the valve cavity is defined as a second pressure P2(ii) a First diameter D1Is larger than the second diameter D2Large, the formed face of the part being workedFirst pressure F of medium axially upwards1The valve core is also acted by self gravity, except that the valve core is acted by the screw rod, the resultant force of the acting force of the valve core is F1-G; when the resultant force is upward, the electric valve works, and the rotor component 2 drives the transmission component 3 to move upward in the axial direction, the valve core 4 is acted by the resultant force which is upward along the axial direction and moves upward along with the transmission component 3 to gradually open the valve port. Wherein the first pressure
Figure BDA0002388157690000051
To realize F1G is directed upwards, the valve port can be opened, and the first diameter D needs to be ensured1Is larger than the second diameter D2. Wherein the area surrounded by the outer edge of the top is
Figure BDA0002388157690000052
The flow area of the valve port is
Figure BDA0002388157690000053
Referring to fig. 2 and 4 in combination, in this embodiment, when the valve core 4 is tightly fitted with the valve port 51, the medium is introduced from the second port 53, the valve core 4 is tightly fitted with the valve seat 51, the valve core chamber 43 is communicated with the upper chamber through the communication hole 421, and the pressure in the two chambers is the first pressure P1(ii) a The resultant F of the forces to which the spool is subjected, in addition to the effect of the screw on the spoolCombination of Chinese herbs＝F2-F3-G wherein
Figure BDA0002388157690000054
Figure BDA0002388157690000055
Figure BDA0002388157690000056
When the first diameter D1Is larger than the second diameter D2When the valve core is in use, the resultant force F of the acting force on the valve core is downward, the whole valve core 4 is always under the action of the axially downward resultant force, the valve core 4 is tightly matched with the valve seat 2, the valve port can not be opened, and the valve can be prevented from being openedThe valve is opened when the system is back-pressed. When the working medium is introduced through the second port 53, in order for the valve element to open the valve port, the resultant force F of the forces acting on the valve element should be directed upward, at least to a second diameter D2Should be larger than the first diameter D2。
Fig. 5 to 8 are schematic views of another embodiment of an electric valve, and the main differences from the above embodiment are that: the side wall 41 includes a large diameter portion 411 and a small diameter portion 412, wherein the diameter of the small diameter portion is a first diameter D1The diameter of the large diameter part is a third diameter D3First diameter D1Smaller than the third diameter D3The side wall part forms an annular step surface 44, the step surface is positioned between the large-diameter part 411 and the small-diameter part 412, and the step surface 44 can be abutted against the bottom 514 of the connecting seat 50 and can limit the valve core 3 to continuously move upwards; first diameter D1Less than the second diameter D2.
Referring to fig. 6 and 7, in the present embodiment, the working medium enters from the first port 52, the valve core 4 is tightly fitted with the valve port 51, the lower cavity portion filled with the working medium is defined as a valve cavity, and the pressure formed in the valve cavity is defined as the second pressure P2(ii) a Third diameter D3Is larger than the second diameter D2The formed surface of the part is subjected to a first pressure F of the working medium axially upwards1Action, third diameter D3Is larger than the first diameter D1Large, and is subjected to a fourth downward pressure F at the step surface4The valve core is also under the action of self gravity, and except the action of the screw rod, the resultant force F of the acting force on the valve coreCombination of Chinese herbsIs F1-F4-G wherein
Figure BDA0002388157690000061
Figure BDA0002388157690000062
Due to the first diameter D1Smaller than the second diameter D2So that the resultant force F of the forces acting on the valve coreCombination of Chinese herbsThe valve core 4 is always kept in close fit with the valve seat 5 due to the resultant force in the axial direction, and the valve can be prevented from being opened when the system is pressed against the pressure.
Referring to fig. 6 and 8, in this embodiment, the working medium enters from the second port 53, the valve core 4 is tightly fitted to the valve port 51, the valve core chamber is communicated with the upper chamber through the communication hole 421, and the pressure in the two chambers is the first pressure P1(ii) a Due to the first diameter D1Greater than the fourth diameter D4The valve core 4 is subjected to a third axial downward acting force F3，
Figure BDA0002388157690000063
Due to the second diameter D2Greater than the fourth diameter D4The valve core 4 is acted by a second acting force F which is axially upward2，
Figure BDA0002388157690000064
The resultant F of the forces to which the spool is subjected, in addition to the effect of the screw on the spoolCombination of Chinese herbsIs F2-F3-G，
Figure BDA0002388157690000065
Figure BDA0002388157690000066
Due to the second diameter D2Is larger than the first diameter D1Under the condition of small and neglected weight, the valve core 4 is wholly subjected to axial upward resultant force, and when the rotor part 2 drives the transmission part 3 to move upwards in an axial direction, the valve core 4 is subjected to axial and upward resultant force to gradually open the valve port along with the axial and upward movement of the transmission part 3, so that the flow regulation is realized.
In the above two embodiments, the valve port can be opened by allowing the working medium to enter one port, the working medium can enter the other port, the electric valve is fully closed, and the electric valve is connected to the system, so that the valve can be prevented from being opened when the system is reversely pressurized.
Fig. 9 to 12 are schematic views of a third embodiment of an electrically operated valve, and the main differences from the second embodiment are that: the top part 42 of the valve core 4 is provided with a through hole which can accommodate the screw rod 31 to pass through, and the through hole and the communication hole can be the same hole in the embodiment, namely the through hole can be the communication hole; the lower end of the screw 31 has a flange311, the screw 31 passes through the through hole from the inside of the valve core 4, the flange part abuts against the inner side surface of the top part 42, and when the transmission component 3 moves axially upwards, the valve core 5 is pulled to gradually get away from the valve port; the side wall 41 includes a large diameter portion 411 and a small diameter portion 412, wherein the diameter of the small diameter portion is a first diameter D1The diameter of the large diameter part is a third diameter D3First diameter D1Smaller than the third diameter D3The side wall part forms an annular step surface 44, the step surface is positioned between the large-diameter part and the small-diameter part, and the step surface 44 can be abutted against the bottom 514 of the connecting seat and can limit the valve core 3 to continuously move upwards; first diameter D1Smaller than the second diameter D2. The screw 31 further comprises a guide portion located on the upper side of the flange portion, the guide portion being in clearance fit with the top portion forming the through hole, the guide portion extending into the valve core cavity and extending in a direction parallel to the side wall portion of the valve core.
Referring to fig. 10 and 11 in combination, in the present embodiment, the valve core 4 is tightly fitted to the valve port 51, and defines a lower cavity portion filled with a working medium as a valve cavity, and the pressure formed in the valve cavity is defined as a second pressure P2(ii) a Third diameter D3Is larger than the second diameter D2The formed surface of the part is subjected to a first pressure F of the working medium axially upwards1Action, third diameter D3Is larger than the first diameter D1Large, and is subjected to a fourth downward pressure F at the step surface4The valve core is also under the action of self gravity, and except the action of the screw rod, the resultant force F of the acting force on the valve coreCombination of Chinese herbsIs F1-F4-G wherein
Figure BDA0002388157690000071
Figure BDA0002388157690000072
Due to the first diameter D1Smaller than the second diameter D2So that the resultant force F of the forces acting on the valve coreCombination of Chinese herbsIs the resultant force in the axial direction; the stator part 1 drives the rotor part 2 to rotate, and when the rotor part 2 drives the transmission part 3 to move upwards along the axial direction, the screw 31 pulls the valve core 4 to open the valve port upwards; the rotor part 2 drives the transmission partWhen the component 3 moves downwards along the axial direction, the valve core 4 is acted by the resultant force of the axial direction and the downward direction and gradually closes the valve port along with the axial direction and the downward movement of the transmission component 3, thereby realizing the flow regulation.
Referring to fig. 10 and 12, in this embodiment, the working medium enters from the second port 53, the valve core 4 is tightly fitted to the valve port 51, the valve core chamber is communicated with the upper chamber through the communication hole 421, and the pressure in the two chambers is the first pressure P1(ii) a Due to the first diameter D1Greater than the fourth diameter D4The valve core 4 is subjected to a third axial downward acting force F3，
Figure BDA0002388157690000073
Due to the second diameter D2Greater than the fourth diameter D4The valve core 4 is acted by a second acting force F which is axially upward2，
Figure BDA0002388157690000074
The resultant F of the forces to which the spool is subjected, in addition to the effect of the screw on the spoolCombination of Chinese herbsIs F2-F3-G，
Figure BDA0002388157690000075
Figure BDA0002388157690000076
Due to the second diameter D1Is larger than the first diameter D2Under the condition of small and neglected weight, the valve core 4 is wholly subjected to the resultant force which is upward in the axial direction, the operation of a transmission part is not needed, and the valve core leaves the valve port, so that the normally open mode of the valve port is realized.
Fig. 13 to 16 are schematic views of a fourth embodiment of an electrically operated valve, the main differences compared to the third embodiment being: first diameter D1Equal to the third diameter D3The top 42 of the valve core 4 is provided with a through hole which can accommodate the screw 31 to pass through, the lower end part of the screw 31 is provided with a flange part, the screw 31 passes through the through hole from the interior of the valve core 4, the flange part is abutted with the inner side surface of the top, and when the transmission component 3 moves axially upwards, the valve core 5 is pulled to be gradually away from the valve port, so that large-flow full opening is realized.
Referring to fig. 14 and 16 in combination, in this embodiment, when the valve core 4 is tightly fitted to the valve port 51, the medium is introduced from the second port 53, the valve core 4 is tightly fitted to the valve seat 51, the valve core chamber 43 is communicated with the upper chamber through the communication hole 421, and the pressure in the two chambers is the first pressure P1(ii) a The resultant F of the forces to which the spool is subjected, in addition to the effect of the screw on the spoolCombination of Chinese herbs＝F2-F3-G, wherein F2 ═ P1*(π
Figure BDA0002388157690000081
Figure BDA0002388157690000082
When the first diameter D1Is larger than the second diameter D2The resultant force F of the acting forces on the valve coreCombination of Chinese herbsDownward, the whole valve core 4 is always acted by the resultant force of the axial direction and the downward, the valve core 4 is tightly matched with the valve seat 2, the stator part 1 drives the rotor part 2 to rotate, and when the transmission part 3 moves upwards along the axial direction, the screw 31 pulls the valve core 4 to open the valve port upwards; when the rotor component 2 drives the transmission component 3 to move downwards along the axial direction, the valve core 4 is acted by the resultant force of the axial direction and the downward direction and gradually closes the valve port along with the axial direction and the downward movement of the transmission component 3, so that the flow regulation is realized.
Referring to fig. 14 and 15 in combination, in this embodiment, when the valve core 4 is tightly fitted to the valve port 51, the medium is introduced from the first port 52, the lower cavity portion filled with the working medium is defined as a valve cavity, and the pressure formed in the valve cavity is defined as a second pressure P2(ii) a First diameter D1Is larger than the second diameter D2The formed surface of the part is subjected to a first pressure F of the working medium axially upwards1The valve core is also acted by self gravity, except that the valve core is acted by the screw rod, the resultant force of the acting force of the valve core is F1-G; when the resultant force is upward, the electric valve works, and the rotor component 2 drives the transmission component 3 to move upward in the axial direction, the valve core 4 is acted by the resultant force which is upward along the axial direction and moves upward along with the transmission component 3 to gradually open the valve port. Wherein the first pressure
Figure BDA0002388157690000083
To realize F1G is directed upwards, the valve port can be opened, and the first diameter D needs to be ensured1Is larger than the second diameter D2. After the valve port in the technical scheme is opened, the valve core cannot be closed, and the electric valve is in a normally open state.
As shown in fig. 17, in the present embodiment, the valve seat 5 is fixedly connected with the connecting seat 50 by welding, and the connecting seat 50 includes a first step surface 511, a second step surface 512, a third step surface 513 and a bottom surface 514; the joint of the first step 511 and the cover body 6 is fixedly connected by welding; the second step surface 512 is abutted against the bottom surface of the cover body 6; the joint of the cover body 6 and the connecting seat 50 is provided with a sealing member 8, and the sealing member 8 is positioned on the third step surface 513 to prevent the working medium from leaking.
The electric valve comprises a top dead center, which limits the valve core 4 to move upwards continuously, and when the valve core moves upwards away from the valve port to the top dead center, the step surface 44 can abut against the top dead center. The electric valve further comprises a connecting seat 51, the connecting seat 51 is fixedly connected with the valve seat 5, the connecting seat 51 forms a guide hole 501, the small diameter portion extends into the guide hole, and the upper stop point is located at the bottom 514 of the connecting seat. The electric valve also comprises a cover body 6 and a connecting cover 7, wherein part of the cover body 6 is positioned between the rotor part and the stator part, and the cover body 6 forms an upper cavity; the connecting cover 7 is positioned at the tail end of the cover body 6 and is fixedly connected with the cover body 6, and the connecting cover 7 is fixedly connected with the nut.
It should be noted that: although the present invention has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the present invention may be modified and equivalents may be substituted for those skilled in the art, and all technical solutions and modifications that do not depart from the spirit and scope of the present invention should be covered by the claims of the present invention.

Claims (11)

1. An electric valve comprises a driving part, a transmission part, a valve core and a valve seat; the electric valve is also provided with an upper cavity and a lower cavity, the transmission part is positioned in the upper cavity, and the lower cavity is formed in the valve seat; the driving part drives the transmission part to move, the transmission part drives the valve core to move, and the valve core can move up and down along an axis; the electric valve is provided with a valve port, a first port and a second port, the valve port is positioned between the first port and the second port, the first port is communicated with the lower cavity, and the second port is communicated with the lower cavity through the valve port; the method is characterized in that: the valve core comprises a side wall part and a top part, the valve core is provided with a valve core cavity, the side wall part and the top part surround the valve core cavity, the valve core is provided with a communication hole, and the communication hole is communicated with the upper cavity and the valve core cavity; the valve core is under the action of the pulling force or the pushing force of the transmission component.
2. Electrically operated valve according to claim 1, characterized in that: when the valve core is pulled upwards by the transmission part, and the area surrounded by the outer edge of the top part is smaller than the flow area of the valve port, the first port is used as an inlet end, the valve core can open and close the valve port, the second port is used as an inlet end, the valve core is far away from the valve port, and the electric valve is a normally open valve.
3. Electrically operated valve according to claim 1, characterized in that: when the valve core is pulled upwards by the transmission part, and the area surrounded by the outer edge of the top is larger than the flow area of the valve port, the second port is used as an inlet end, the valve core can open and close the valve port, the first port is used as an inlet end, the valve core is far away from the valve port, and the electric valve is a normally open valve.
4. An electrically operated valve according to claim 2 or 3, characterised in that: the driving part comprises a stator part and a rotor part, and the transmission part comprises a screw and a nut; the screw is fixedly connected with the rotor component; the outer wall of the screw rod is provided with external threads; the nut is provided with internal threads, the screw is in threaded connection with the nut, the tail end of the screw is provided with a flange part, a through hole is formed in the top part, part of the screw is located in the through hole, the flange part is located on the inner side of the top part of the valve core, and the outer diameter of the flange is larger than the diameter of the through hole.
5. Electrically operated valve according to claim 4, characterized in that: the screw further comprises a guide portion located on the upper side of the flange portion, the guide portion is in clearance fit with the top portion forming the through hole, the guide portion extends into the valve core cavity, and the extending direction of the guide portion is parallel to the side wall portion of the valve core.
6. Electrically operated valve according to claim 5, characterized in that: the side wall portion comprises a small diameter portion, a large diameter portion and an abutting portion, the abutting portion abuts against a valve seat corresponding to the valve port, the outer edge of the small diameter portion is aligned with the outer edge of the top portion, the outer diameter of the large diameter portion is larger than that of the small diameter portion, a step surface is formed between the large diameter portion and the small diameter portion, the large diameter portion is located between the abutting portion and the step surface, and the small diameter portion is located between the top portion and the step surface; the electrically operated valve comprises a top dead center, the top dead center limits the valve core to continue moving upwards, and when the valve core is far away from the valve port and moves upwards to the top dead center, the step surface can be abutted against the top dead center.
7. Electrically operated valve according to claim 6, characterized in that: the electric valve further comprises a connecting seat, the connecting seat is fixedly connected with the valve seat, the connecting seat forms a guide hole, the small-diameter portion extends into the guide hole, and the upper stop point is located at the bottom of the connecting seat.
8. Electrically operated valve according to any of claims 4-7, characterized in that: the electric valve further comprises a cover body and a connecting cover, wherein part of the cover body is positioned between the rotor part and the stator part, and the cover body forms the upper cavity; the connecting cover is positioned at the tail end of the cover body and fixedly connected with the cover body, and the connecting cover is fixedly connected with the nut.
9. Electrically operated valve according to claim 8, characterized in that: the abutting part is of an inclined plane or cambered surface structure; the outer diameter of the abutting part is gradually increased from the free end of the abutting part to the large-diameter part, and at least part of the abutting part is located in the lower cavity.
10. Electrically operated valve according to claim 9, characterized in that: the outer peripheral surface of the small diameter part and the outer peripheral surface of the large diameter part are both cylindrical, the diameter of the small diameter part is smaller than that of the large diameter part, the valve port is circular, and the abutting part is matched with the valve port in shape.
11. Electrically operated valve according to claim 9, characterized in that: the cross sections of the outer peripheral surface of the small diameter part and the outer peripheral surface of the large diameter part corresponding to each other are rectangular, the equivalent diameter of the small diameter part is smaller than that of the large diameter part, the valve port is rectangular, and the abutting part is matched with the valve port in shape.
CN202010104728.4A 2020-02-20 2020-02-20 Electric valve Active CN113280121B (en)

Priority Applications (1)

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CN202010104728.4A CN113280121B (en) 2020-02-20 2020-02-20 Electric valve

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Application Number Priority Date Filing Date Title
CN202010104728.4A CN113280121B (en) 2020-02-20 2020-02-20 Electric valve

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CN113280121A true CN113280121A (en) 2021-08-20
CN113280121B CN113280121B (en) 2025-02-25

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB834434A (en) * 1955-08-18 1960-05-11 Rockwell Mfg Co Improvements in lubricated rotary plug valves
DE29705205U1 (en) * 1997-03-14 1997-06-05 Schell GmbH & Co. KG, 57462 Olpe Angle valve
JP2004337897A (en) * 2003-05-14 2004-12-02 Denso Corp Hand press
WO2012109993A1 (en) * 2011-02-17 2012-08-23 浙江三花股份有限公司 Electrical expansion valve
JP2013015085A (en) * 2011-07-05 2013-01-24 Daikin Industries Ltd Screw compressor
GB201609125D0 (en) * 2016-05-24 2016-07-06 Norgren Gmbh Adjustable linear actuator valve
US20170096934A1 (en) * 2014-05-15 2017-04-06 Tianjin Challenging Technology Consultlng Co.Ltd Double-crankshaft variable compression ratio engine
CN107304852A (en) * 2016-04-22 2017-10-31 浙江三花智能控制股份有限公司 Electric expansion valve and the refrigeration plant with it
CN110296259A (en) * 2018-03-23 2019-10-01 浙江三花智能控制股份有限公司 Electric expansion valve and refrigeration system with it

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB834434A (en) * 1955-08-18 1960-05-11 Rockwell Mfg Co Improvements in lubricated rotary plug valves
DE29705205U1 (en) * 1997-03-14 1997-06-05 Schell GmbH & Co. KG, 57462 Olpe Angle valve
JP2004337897A (en) * 2003-05-14 2004-12-02 Denso Corp Hand press
WO2012109993A1 (en) * 2011-02-17 2012-08-23 浙江三花股份有限公司 Electrical expansion valve
JP2013015085A (en) * 2011-07-05 2013-01-24 Daikin Industries Ltd Screw compressor
US20170096934A1 (en) * 2014-05-15 2017-04-06 Tianjin Challenging Technology Consultlng Co.Ltd Double-crankshaft variable compression ratio engine
CN107304852A (en) * 2016-04-22 2017-10-31 浙江三花智能控制股份有限公司 Electric expansion valve and the refrigeration plant with it
GB201609125D0 (en) * 2016-05-24 2016-07-06 Norgren Gmbh Adjustable linear actuator valve
CN110296259A (en) * 2018-03-23 2019-10-01 浙江三花智能控制股份有限公司 Electric expansion valve and refrigeration system with it

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