CN116292945A

CN116292945A - Electric valve

Info

Publication number: CN116292945A
Application number: CN202111569382.6A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2021-12-21
Filing date: 2021-12-21
Publication date: 2023-06-23
Also published as: WO2023116656A1

Abstract

The utility model provides an electric valve, including lead screw and case subassembly, the case subassembly includes the case, nut spare, elastic component and case cover, the case has the installation cavity, elastic component and partial nut spare are located the installation cavity, case cover and case fixed connection, lead screw and nut spare threaded connection, along the axial of case subassembly, nut spare is located between case cover and the elastic component, elastic component respectively with nut spare and case butt and be in compression state, the case cover includes the check point, the case includes the check point down, it is spacing to the axial motion of nut spare to go up the check point and the check point down, go up the check point to the axial height of check point down be H, the axial height of nut spare is H, H > H, so when the electric valve receives the high temperature influence after, under the effect of elastic component, the elastic component can compensate the screw pair clearance of lead screw and nut spare, promote case and valve oral area butt, be favorable to improving the sealing performance of electric valve.

Description

Electric valve

Technical Field

The application relates to the technical field of fluid control, and more particularly relates to an electric valve.

Background

The electric valve can be applied to an air conditioning system or a heat pump system to throttle and/or directly pass a working fluid. The electric valve in the related art comprises a screw rod, a valve core assembly and a valve port part, wherein the screw rod is in threaded connection with the valve core assembly, the screw rod can enable the valve core assembly to be in abutting connection with the valve port part under the action of threads to conduct valve closing action, and in order to improve the sealing performance of the valve port part, the inventor knows that the valve port part adopts a technical scheme of plastic materials. However, when the electric valve is in a high temperature environment after closing, the valve port part (plastic material) expands at high temperature to push the valve core assembly upwards in the axial direction (due to the existence of the screw thread pair clearance), and when the electric valve is restored to a normal temperature environment, the valve port part is retracted to an original state, and at this time, the valve port part and the valve core assembly may not be tightly closed and sealed.

Disclosure of Invention

The purpose of this application is to provide an electric valve, is favorable to improving the sealing performance of electric valve.

In order to achieve the above purpose, the present application adopts the following technical scheme:

the utility model provides an electric valve, includes lead screw and case subassembly, the case subassembly includes case, nut spare, elastic component and case cover, the case has the installation cavity, elastic component and part the nut spare is located the installation cavity, the lead screw with nut spare threaded connection, case cover with case fixed connection follows the axial of case subassembly, the nut spare is located the case cover with between the elastic component, the elastic component respectively with nut spare with the case butt, the elastic component is in compression state, the case cover includes the check point, the case includes the check point down, go up the check point with the check point is right down the axial motion of nut spare is spacing, defines go up the check point extremely the axial height of check point is H down, the axial height of nut spare is H, both satisfy the relation: h > H. .

The utility model provides an embodiment provides an electrically operated valve, including lead screw and case subassembly, the case subassembly includes the case, nut spare, elastic component and case cover, the case has the installation cavity, elastic component and partial nut spare are located the installation cavity, case cover and case fixed connection, lead screw and nut spare threaded connection, along the axial of case subassembly, nut spare is located between case cover and the elastic component, the elastic component respectively with nut spare and case butt and be in compressed state, the case cover includes the check point, the case includes the check point down, go up the check point and the axial motion of check point to the nut spare down is spacing, go up the check point and the axial height of check point down is H, the axial height of nut spare is H, H > H, like this when electrically operated valve receives the high temperature influence when closing the valve after, under the effect of elastic component, the elastic component can compensate the screw and nut spare screw pair clearance, promote case and valve mouth butt, be favorable to improving the sealing performance of electrically operated valve.

Drawings

FIG. 1 is a schematic cross-sectional view of one embodiment of an electrically operated valve;

FIG. 2 is a schematic cross-sectional view of the valve member of FIG. 1;

FIG. 3 is a schematic view of an exploded view of the valve cartridge assembly of FIG. 1;

FIG. 4 is a schematic perspective view of the valve cartridge assembly of FIG. 1;

FIG. 5 is a schematic cross-sectional view of the valve cartridge of FIG. 3;

FIG. 6 is a schematic cross-sectional view of the valve cartridge assembly of FIG. 4.

Detailed Description

Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present invention more apparent, and in conjunction with the following drawings and detailed embodiments. Relational terms such as "first" and "second", and the like, may be used solely to distinguish one element from another element having the same name, and do not necessarily require or imply any such actual relationship or order between the elements.

Referring to fig. 1, the electric valve 100 may be applied to an air conditioning system or a heat pump system, where the electric valve 100 includes a driving component 1, a valve component 2, and a valve body component 3, a part of the valve component 2 is located in a valve body cavity 30 formed by the valve body component 3, and the valve component 2 is fixedly connected or limitedly connected with the valve body component 3, and further, a sealing arrangement is further performed between the valve component 2 and the valve body component 3, which is beneficial to preventing leakage of working fluid. The driving part 1 is sleeved on the periphery of the other part of the valve part 2, the driving part 1 is fixedly connected or detachably connected with the valve part 2 or the driving part 1 is fixedly connected or detachably connected with the valve body part 3, and further, sealing arrangement can be carried out between the driving part 1 and the valve part 2 or between the driving part 1 and the valve body part 3, so that the driving part 1 is prevented from being failed or corroded due to the fact that media such as water vapor in the external environment enter the driving part 1. The motor-operated valve 100 is electrically and/or signally connected to the outside via the drive member 1.

Referring to fig. 2, the valve member 2 includes a rotor assembly 21, a screw assembly 22, a stopper assembly 23, a spool assembly 24, a spool seat assembly 25, a connection seat 26, and a sleeve 27. The screw assembly 22 includes a screw 221, one end of the screw 221 is fixedly connected with the rotor assembly 21, and the other end of the screw 221 is screw-connected with the valve core assembly 24. The stop assembly 23 is located at the outer periphery of a portion of the screw 221, the stop assembly 23 being fixedly connected to the connection seat 26, and in this embodiment, at least a portion of the stop assembly 23 is located within the rotor cavity 210 of the rotor assembly 21, which is advantageous in reducing the axial height of the valve member 2. The valve core seat assembly 25 is located at the outer periphery of a part of the valve core assembly 24, and the valve core seat assembly 25 is fixedly connected with the connecting seat 26. The sleeve 27 is sleeved on the periphery of the rotor assembly 21, the sleeve 27 is fixedly connected with the connecting seat 26, and the sleeve 27 and the valve core seat assembly 25 are positioned on two sides of the connecting seat 26 along the axial direction of the valve component 2.

Referring to fig. 2, the rotor assembly 21 includes a magnet rotor 211 and a connection plate 212, the magnet rotor 211 is fixedly connected with the connection plate 212, and the connection plate 212 is fixedly connected with one end of a screw 221. The stopper assembly 23 includes a stopper seat member 231 and a stopper rod 232, the stopper seat member 231 is located at the outer periphery of a portion of the screw rod 221, the stopper seat member 231 is fixedly connected with the connection seat 26, the stopper rod 232 is fixedly connected with the rotor assembly 21, and in this embodiment, the stopper rod 232 is fixedly connected with the connection plate 212. The rotor assembly 21 drives the stop rod 232 to rotate circumferentially together, and the stop rod 232 can cooperate with the stop seat member 231 to stop the circumferential rotation stroke of the rotor assembly 21. The screw assembly 22 further includes a bearing 222 and a collar 223, the bearing 222 is located at the outer periphery of a portion of the screw 221, the bearing 222 and the screw 221 can be in transition fit, the bearing 222 is located in an assembly cavity 261 of the connecting seat 26, the bearing 222 and the connecting seat 26 can be in transition fit, the bearing 222 is located between a supporting surface of the connecting seat 26 and a lower end surface of the stop seat member 231 along the axial direction of the stop seat member 231, and the end surface of the stop seat member 231 adjacent to the bearing 222 is a lower end surface. The bearing 222 is restrained or pressed by the support surface and the end surface of the stopper seat member 231. The collar 223 is located at the outer periphery of a portion of the screw 221, and the collar 223 is fixedly connected to the screw 221, and in this embodiment, at least a portion of the collar 223 is located in a mating cavity where the stopper seat member 231 mates with the screw 221, which is advantageous in reducing the axial height of the valve member 2. The lead screw 221 further includes a flange portion 224, and the flange portion 224 is formed to protrude outward in the radial direction of the lead screw. In the axial direction of the valve member 2, the bearing 222 is located between the flange 224 and the collar 223, so that when the bearing 222 is restrained or fixed, the axial movement of the screw 221 is restrained by the flange 224 abutting the bearing 222 or the collar 223 abutting the bearing 222. The valve core assembly 24 comprises a nut member 241, the nut member 241 can be formed by plastic material injection molding, and the other end of the screw rod 221 is in threaded connection with the nut member 241, so that threads of the screw rod 221 and the valve core assembly 21 are realized, and the nut member 241 is made of plastic material, so that threaded wear of the screw rod 221 and the nut member 241 during threaded matching is reduced. The nut 241 includes a limiting portion 2411, where the limiting portion 2411 is a non-rotating body, and the limiting portion 2411 can be in limiting fit with the connection seat 26 to limit the circumferential rotation of the valve core assembly 24, and the structure of limiting fit can have various forms, so long as the structure can limit the circumferential rotation of the valve core assembly 24. The valve core seat assembly 25 includes a valve core seat 251, the valve core seat 251 may be made of a plastic material, the valve core seat 251 includes a valve port portion 2511, and the valve port portion 2511 forms a valve port.

Referring to fig. 1, the operating principle of the electric valve 100 is as follows: after the electric valve 100 is electrified, the stator assembly of the driving part 1 generates an excitation magnetic field, the rotor assembly 21 can drive the screw rod 221 to circumferentially rotate together under the excitation of the magnetic field of the stator assembly, the screw rod 221 is in threaded connection with the valve core assembly 24, the axial movement of the screw rod 221 is limited by the bearing 222, under the condition that the circumferential movement of the valve core assembly 24 is limited by the connecting seat 26, the valve core assembly 24 can linearly reciprocate along the axial direction of the valve part 2 under the action of the threads, and then can approach or depart from a valve port, throttling or on-off is formed at the valve port, and the movement stroke of the valve core assembly 24 is stopped by the stop assembly 23. When the electric valve 100 is closed, the valve body assembly 24 moves to abut against the valve port 2511 to form a seal. Providing the valve port portion 2511 of a plastic material facilitates a better soft and hard seal between the valve core assembly 24 and the valve port portion 2511 when the electric valve 100 is closed.

It should be noted that when the electric valve 100 is in the closed state and in a high temperature environment, the valve port portion 2511 of plastic material expands at a high temperature, which generates a force to push up the valve core assembly 24 in the axial direction on the valve core assembly 24, and further, the screw rod 221 and the valve core assembly 24 are screwed together, so that a screw pair gap exists, and further, the nut member 24 expands under the influence of a high temperature, which may further cause the screw pair gap to expand. Thus, the valve core assembly 24 may move upwards within a gap range along the axial direction under the expansion force of the valve port portion 2511, and when the subsequent electric valve 100 is restored to the normal temperature state, the valve port portion 2511 is retracted to the original state, at this time, a gap may exist between the valve core assembly 24 moving upwards and the original abutting part of the valve port portion 2511 due to the gap, so that the working fluid leaks inwards, and the problems of loose valve closing and loose sealing are caused.

To solve the above-described problems, referring to fig. 3 to 6, the valve core assembly 24 further includes a valve core 242, an elastic member 243, and a valve core sleeve 244, and specifically, the valve core 242 includes a main body portion 2421 and a connection portion 2422, the connection portion 2422 is formed to extend upward from an end surface of the main body portion 2421 along an axial direction of the valve core 242, defining that the direction in which the valve core 242 approaches the valve core sleeve 244 is upward along the axial direction of the valve core 242. The main body part 2421 includes a mounting part, the mounting part forms a mounting cavity 2423, the elastic element 243 is located in the mounting cavity 2423, a part of the nut 241 is located in the mounting cavity 2423, specifically, the nut 241 includes a limiting part 2411 and a base part 2412, the limiting part 2411 is connected with the base part 2412, the limiting part 2411 and the base part 2412 may be integrally injection molded by plastic materials, along a radial direction of the base part 2412, the limiting part 2411 protrudes out of the base part 2412, at least part of the body part 2412 is located in the mounting cavity 2423, and a clearance fit may be provided between the base part 2412 and the mounting part. Along the axial direction of the spool assembly 24, the nut member 241 is disposed closer to the connection portion 2422 than the elastic member 243. The mounting portion includes a first stepped portion 2424, the first stepped portion 2424 is disposed farther from the nut member 241 than the elastic member 243 in the axial direction of the valve element assembly 24, one end of the elastic member 243 abuts against the first stepped portion 2424, the other end of the elastic member 243 abuts against the nut member 241, and specifically abuts against the lower end surface of the base portion 2412 located in the mounting chamber 2423, and the elastic member 243 is in a compressed state. The end surface of the nut member 241 adjacent to the elastic member 243 is defined as a lower end surface along the axial direction of the valve core assembly 24, in this embodiment, the lower end surface is located at the base portion 2412, and the end surface of the nut member 24 remote from the elastic member 243 is an upper end surface, in this embodiment, the upper end surface is located at the limiting portion 2411 of the nut member 241. In this embodiment, the elastic member 243 has a spring structure, but other structures of the elastic member 243 are also possible as other embodiments.

The connection portion 2422 is of a discontinuous structure, or the connection portion 2422 is arranged in a sectional manner, in this embodiment, the connection portion 2422 is symmetrically arranged, so that a gap allowing the limiting portion 2411 to radially extend out of the valve core 242 is formed between the connection portion 2422 and the main body portion 2421, thereby realizing the limiting cooperation between the limiting portion 2411 and the connection seat 26, and limiting the circumferential rotation of the valve core assembly 24. The connection portion 2422 is located at least partially on the outer periphery of the valve core sleeve 244, and the valve core sleeve 244 is fixedly connected to the connection portion 2422, in this embodiment, the valve core sleeve 244 and the connection portion 2422 are fixed by welding, however, the valve core sleeve 244 and the connection portion 2422 may be fixedly connected in other conventional manners known in the art. The mounting portion further includes a second stepped portion 2425, the second stepped portion 2425 is disposed closer to the nut member 241 than the first stepped portion 2424 in the axial direction of the valve element 242, the nut member 241 is located between the valve element housing 244 and the second stepped portion 2425 in the axial direction of the valve element assembly 24, in this embodiment, the nut member 241 can abut against the lower end face of the valve element housing 244 in the axial direction or the nut member 241 can abut against the second stepped portion 2425 in the axial direction, defining the axial direction of the valve element housing 244, and the end face of the valve element housing 244 close to the nut member 241 is the lower end face. Defining the axial height from the lower end surface of the valve core sleeve 244 to the second stepped portion 2425 as H, the axial height H of the nut member 241 satisfies the relationship: h > H, further, 1.1 h.gtoreq.H > H may be set. Thus, referring to fig. 1 and 2, according to the working principle of the electric valve 100, when the nut 241 moves upward in the axial direction under the action of the screw thread, the upper end surface of the nut 241 can abut against the lower end surface of the valve core sleeve 244, and after the abutment, the nut 241 drives the valve core 242 to move upward together through the valve core sleeve 244 under the continued action of the screw thread, so as to perform the valve opening action. When the nut 241 moves axially downward under the action of the screw, the lower end surface of the nut 241 can abut against the second step portion 2425, at this time, the nut 241 further compresses the elastic member 243, and after abutting, under the continued action of the screw, the nut 241 drives the valve core 242 to move downward together (at this time, the elastic member 243 is kept in a certain compressed state), and the valve core 242 abuts against the valve port portion 2511 to form a seal, so as to perform a valve closing action. Because of the existence of the elastic element 243 and the displacement of the nut 241 in the axial direction in a small range, when the valve port 2511 is expanded by high temperature after closing the valve to push up the valve core 242 and returns to the original normal temperature state, the elastic element 243 can cause the valve core 242 to move downwards to be abutted against the valve port 2511 under the elastic action of the elastic element 243, which is beneficial to avoiding or reducing the problem of loose sealing caused by the influence of temperature on the valve core 242 and the valve port 2511 and improving the sealing performance of the electric valve. It will be appreciated that in this embodiment, the nut 241 is axially limited by the lower end surface of the valve core sleeve 244 and the second stepped portion 2424, and as other embodiments, the nut 241 may also be limited by other structural forms of the valve core sleeve 244 and the valve core 242, so, without losing generality, the valve core sleeve 244 includes an upper stop point for limiting the upward axial movement of the nut 241, the valve core 242 includes a lower stop point for limiting the downward axial movement of the nut 241, the axial height from the upper stop point to the lower stop point is H, the axial height of the nut 241 is H, H > H, and further, 1.1H is greater than or equal to H > H.

The nut member 241 further has a threaded hole 2413, the threaded hole 2413 is formed through the nut member 241 in the axial direction, an internal thread section is formed on a side wall forming the threaded hole 2413, correspondingly, an external thread section is formed at an end portion of the screw rod 221 screwed with the nut member 241, and an end portion of the screw rod 221 provided with the external thread section extends into the threaded hole 2413 through the through hole 2441 of the valve core sleeve 244 and is screwed with the nut member 241, thereby realizing the threaded connection of the nut member 241 and the valve core assembly 24. In the present embodiment, the nut member 241 further includes a balance groove 2414 (see fig. 3), and the balance groove 2414 is formed recessed from the side wall surface of the base portion 2412 in a direction away from the side wall surface in the radial direction of the base portion 2412. The number of the balance grooves 2414 is at least one, and in this embodiment, the number of the balance grooves 2414 is two and symmetrically arranged. Accordingly, the valve body 242 further has a communication hole 2426, and the communication hole 2426 communicates with the installation chamber 2423. Referring to fig. 1 and 2, the working fluid can flow from the communication hole 2426 into the installation cavity 2423, and through the groove cavity formed by the balance groove 2414, from the through hole 2411 of the cartridge sleeve 244 and/or from the gap clearance where the cartridge 242 is engaged with the stop portion 2411 into the fitting cavity 261 of the connection seat 26, acting on the back pressure side of the cartridge assembly 24, to facilitate the balance or to tend to balance of the axial direction of the cartridge assembly 24 by the pressure of the working fluid. Of course, as another embodiment, the nut 241 may not include the balance groove 2414, that is, the working fluid may flow into the installation cavity 2423 through the communication hole 2426, and then flow into the installation cavity 261 of the connection seat 26 through the fit gap between the nut 241 (the base portion 2412) and the installation portion of the valve core 242 and/or the screw fit gap between the nut 241 and the screw 221, and then act on the back pressure side of the valve core assembly 24 from the through hole 2411 and/or from the gap between the valve core 242 and the limit portion 2411. Providing the balance groove 2414 is primarily advantageous for rapidly bringing the valve core assembly 24 into or toward force balance. Of course, it will be understood that, instead of providing the balancing grooves 2414 on the nut member 241, balancing holes may be provided on the nut member 241, and the balancing holes may be provided through the nut member 241 in an axial direction, where the number of balancing holes is at least one, and the communication hole 2426 may be communicated with the assembly cavity 261 of the connection seat 26 through but not limited to the balancing holes, so as to achieve the purpose of force balancing or tending to force balance of the valve core assembly 24.

It should be noted that: the above embodiments are only for illustrating the present application and not for limiting the technical solutions described in the present application, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the present application may be modified or substituted by equivalent ones, and all technical solutions and modifications thereof without departing from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. The utility model provides an electric valve, includes lead screw and case subassembly, its characterized in that: the valve core assembly comprises a valve core, a nut piece, an elastic piece and a valve core sleeve, wherein the valve core is provided with an installation cavity, the elastic piece and part of the nut piece are positioned in the installation cavity, the screw rod is in threaded connection with the nut piece, the valve core sleeve is fixedly connected with the valve core, the nut piece is positioned between the valve core sleeve and the elastic piece along the axial direction of the valve core assembly, the elastic piece is respectively abutted with the nut piece and the valve core, the elastic piece is in a compression state, the valve core sleeve comprises an upper stop point, the valve core comprises a lower stop point, the upper stop point and the lower stop point are limited by the axial movement of the nut piece, the axial height from the upper stop point to the lower stop point is defined as H, the axial height of the nut piece is H, and the two conditions are as follows: h > H.

2. The electrically operated valve of claim 1, wherein: the valve core comprises a mounting part, the mounting part forms the mounting cavity, the mounting part comprises a first step part, the first step part is far away from the nut piece than the elastic piece in the axial direction of the valve core assembly, one end of the elastic piece is abutted to the first step part, and the other end of the elastic piece is abutted to the lower end face of the nut piece.

3. The electrically operated valve of claim 2, wherein: the mounting part further comprises a second stepped part, the second stepped part is closer to the nut piece than the first stepped part in the axial direction of the valve core, the second stepped part is the lower stop point, the lower end face of the valve core sleeve is the upper stop point, the lower ends of the second stepped part and the valve core sleeve face the axial movement limiting part of the nut piece, and the axial height from the lower end face of the valve core sleeve to the second stepped part is H, and 1.1H is more than or equal to H.

4. A valve according to any one of claims 1-3, wherein: the electric valve further comprises a valve port part, wherein the valve port part is made of plastic materials and forms a valve port;

when the nut piece moves upwards along the axial direction under the action of the threads, the nut piece is abutted with the upper stop point, after the abutment, the nut piece drives the valve core to move upwards along the axial direction through the valve core sleeve, the valve core is far away from the valve port, and the electric valve is opened;

when the nut piece moves downwards along the axial direction under the action of the threads, the nut piece is abutted with the lower stop point, after the nut piece is abutted, the nut piece drives the valve core to move downwards along the axial direction, the valve core can be abutted with the valve port part, and the electric valve is closed.

5. A valve according to any one of claims 1-3, wherein: the valve core comprises a main body part and a connecting part, the connecting part extends upwards from the end face of the main body part along the axial direction of the valve core, the main body part forms the mounting cavity, the connecting part is positioned on the periphery of at least part of the valve core sleeve, and the connecting part is fixedly connected with the valve core sleeve.

6. The electrically operated valve of claim 5, wherein: the connecting part is arranged in a sectional mode, a gap is formed between the connecting part and the main body part, and the limiting part of the nut piece extends out of the valve core from the gap along the radial direction of the valve core;

the electric valve further comprises a connecting seat, the connecting seat is provided with an assembly cavity, the limiting part is located in the assembly cavity, and the limiting part is in limiting fit with the connecting seat to limit circumferential rotation of the nut.

7. The electrically operated valve of claim 6, wherein: the valve core is provided with a communication hole, the nut piece comprises balancing grooves, the balancing grooves are formed in a recessed mode from the side wall surface of the nut piece to be far away from the side wall surface along the radial direction of the nut piece, the number of the balancing grooves is at least one, the balancing grooves form groove cavities, and the groove cavities are communicated with the communication hole and the assembly cavity.

8. The electrically operated valve of claim 6, wherein: the valve core is provided with a communication hole, the nut piece is provided with a balance pore canal, the balance pore canal penetrates through the nut piece along the axial direction of the nut piece, the number of the balance pore canals is at least one, and the balance pore canal is communicated with the communication hole and the assembly cavity.

9. An electrically operated valve as claimed in any one of claims 7 to 8, wherein: the electric valve further comprises a bearing and a lantern ring, wherein the bearing is positioned at the periphery of the part of the screw rod, the bearing is in transition fit with the screw rod, the bearing is positioned in the assembly cavity, the bearing is in transition fit with the connecting seat, and the bearing is fixed or axially limited; the sleeve ring is positioned on the periphery of the part of the screw rod, the sleeve ring is fixedly connected with the screw rod, the screw rod further comprises a flange part, the flange part is formed by protruding outwards in the radial direction of the screw rod, the bearing is positioned between the flange part and the sleeve ring in the axial direction of the screw rod, and the bearing and the sleeve ring limit the axial movement of the screw rod.