CN117212491A - Valve device - Google Patents

Abstract

The valve device comprises a valve core seat assembly and a valve core assembly, wherein the valve core seat assembly comprises a first sealing assembly, a first side wall of the valve core assembly can slide relative to the first sealing assembly along the axial direction of the valve device, when the valve device is in a valve opening state, a first channel and a second channel of the valve device are communicated, and a first section of the first side wall is abutted against the first sealing assembly; when the valve device is in a valve closing state, the second section of the first side wall is abutted with the first sealing component, and the first channel and the second channel of the valve device are not communicated; in the process that the valve core assembly moves relative to the first sealing assembly, the first side wall of the valve core assembly is in contact with the first sealing assembly, so that the risk of falling off of the first sealing assembly is reduced, and the sealing effect is improved.

Description

Valve device

Technical Field

The application relates to the technical field of fluid control, in particular to a valve device.

Background

The valve device comprises a valve core assembly and a valve core seat assembly, wherein the valve core seat assembly comprises a sealing element, and the sealing element is easy to separate in the moving process of the valve core assembly relative to the sealing element, so that the sealing effect is influenced.

Disclosure of Invention

The application aims to provide a valve device which is beneficial to improving sealing effect.

In order to achieve the above object, one embodiment of the present application adopts the following technical scheme:

a valve device comprising a valve cartridge seat assembly and a valve cartridge assembly, the valve cartridge seat assembly comprising a first seal assembly, the valve cartridge assembly comprising a first sidewall slidable relative to the first seal assembly in an axial direction of the valve device, the valve device having a first passage and a second passage, the valve device having a valve open state and a valve closed state, the first passage communicating with the second passage when the valve device is in the valve open state, a first section of the first sidewall abutting the first seal assembly; when the valve device is in a valve-closed state, the second section of the first side wall abuts the first seal assembly, and the first channel and the second channel are not communicated.

One embodiment of the application provides a valve device, comprising a valve core seat assembly and a valve core assembly, wherein the valve core seat assembly comprises a first sealing assembly, a first side wall of the valve core assembly can slide relative to the first sealing assembly along the axial direction of the valve device, when the valve device is in a valve opening state, a first channel and a second channel of the valve device are communicated, and a first section of the first side wall is abutted against the first sealing assembly; when the valve device is in a valve closing state, the second section of the first side wall is abutted with the first sealing component, and the first channel and the second channel of the valve device are not communicated; in the process that the valve core assembly moves relative to the first sealing assembly, the first side wall of the valve core assembly is in contact with the first sealing assembly, so that the risk of falling off of the first sealing assembly is reduced, and the sealing effect is improved.

Drawings

FIG. 1 is a schematic cross-sectional view of a first embodiment of a valve device of the present application;

FIG. 2 is a schematic cross-sectional view of the valve member of the valve apparatus of FIG. 1 in an open valve state;

FIG. 3 is a schematic cross-sectional view of the valve member of the valve apparatus of FIG. 1 in a closed state;

FIG. 4 is a schematic view of a partial enlarged structure at A in FIG. 2;

FIG. 5 is an enlarged partial structural schematic view of another embodiment of the first seal assembly;

FIG. 6 is a schematic view of a partially enlarged construction of yet another embodiment of a first seal assembly;

fig. 7 is a schematic cross-sectional structure of a second embodiment of the valve device of the present application.

Detailed Description

The application is further described with reference to the accompanying drawings 1-7 and specific examples, in which numerous specific details are set forth in the following detailed description in order to provide a thorough understanding of the application. Those skilled in the art will appreciate that the specific components, devices, and features illustrated in the accompanying drawings and described herein are merely exemplary and should not be considered limiting.

The valve device may be applied to a vehicle thermal management system including a new energy vehicle thermal management system in which the valve device is often employed as a throttle element or a switching element or an air conditioning system, and particularly to a circulation system in which CO2 is used as a refrigerant. Referring to fig. 1, the valve device 100 includes a driving part 2 and a valve part 3, the driving part 2 is located at the periphery of a part of the valve part 3, the driving part 2 is fixedly connected or in limited connection with the valve part 3, and further, a sealing arrangement can be performed between the driving part 2 and the valve part 3, which is beneficial to preventing water vapor or other impurities in the external environment from entering from an assembly gap between the driving part 2 and the valve part 3, so that corrosion or failure inside the driving part 2 is caused. The driving part 2 comprises an outer shell and a stator assembly, the stator assembly is positioned on the periphery of the partial valve part 3, the driving part 2 is formed by injection molding at least by taking the stator assembly as an insert, and the outer shell is an injection molding. The valve device 100 is electrically and/or signally connected to the outside via the drive member 2.

Referring to fig. 1, the valve member 3 includes a rotor assembly 31, a screw rod 32, a valve core assembly 33, a connection seat 34, a valve core seat assembly 35, and a sleeve 36, the connection seat 34 is located at the outer periphery of a portion of the screw rod 32 and at the outer periphery of a portion of the valve core assembly 33, the valve core seat assembly 35 is located at the outer periphery of another portion of the valve core assembly 33, the connection seat 34 is fixedly connected with the valve core seat assembly 35, the sleeve 36 is sleeved on the outer periphery of the rotor assembly 31, the sleeve 36 is fixedly connected with the connection seat 34, the rotor assembly 31 is fixedly connected with or in limited connection with one end portion of the screw rod 32, the other end portion of the screw rod 32 is in transmission connection with the valve core assembly 33, and in particular, the other end portion of the screw rod 32 is in threaded connection with the valve core assembly 33. The valve device 100 has a first channel 411 and a second channel 412, when the rotor assembly 31 rotates circumferentially under the excitation of the magnetic field of the stator assembly, the rotor assembly 31 drives the screw rod 32 to rotate, the screw rod 32 can drive the valve core assembly 33 to perform linear reciprocating motion along the axial direction of the valve device 100, the valve device 100 has a valve opening state and a valve closing state, and when the valve device 100 is in the valve opening state, referring to fig. 2, the first channel 411 is communicated with the second channel 412; when the valve device 100 is in the closed state, referring to fig. 3, the first passage 411 and the second passage 412 do not communicate. The axial direction of the valve device 100 is the N direction shown in fig. 1. The fixed connection described herein includes both detachable and non-detachable connections.

Referring to fig. 1-3, the valve device 100 includes a valve cartridge seat assembly 35 and a valve cartridge assembly 33, the valve cartridge seat assembly 35 includes a first seal assembly 40, the valve cartridge assembly 33 includes a first sidewall 407, the first sidewall 407 contacts the first seal assembly 40 along a radial direction of the valve cartridge assembly 33, the first sidewall 407 of the valve cartridge assembly 33 is capable of sliding relative to the first seal assembly 40 along an axial direction of the valve device 100, the valve device 100 has a first channel 411 and a second channel 412, specifically, along the axial direction of the valve device 100, the first channel 411 is located on a side of the valve cartridge assembly 33 facing away from the driving part 2, the second channel 412 is located radially outside the valve cartridge assembly 33, and the radial direction of the valve cartridge assembly 33 is substantially perpendicular to the axial direction of the valve device 100, which is not absolutely perpendicular, and an error within 10 ° can be allowed; the valve device 100 has a valve-open state and a valve-closed state, when the valve device 100 is in the valve-open state, referring to fig. 2, the first section 4071 of the first sidewall 407 abuts against the first seal assembly 40, and the first channel 411 communicates with the second channel 412; when the valve device 100 is in the closed valve state, referring to fig. 3, the second section 4072 of the first sidewall 407 abuts the first seal assembly 40 and the first channel 411 and the second channel 412 do not communicate. During the movement of the valve core assembly 33 relative to the first sealing assembly 40, the first side wall 407 of the valve core assembly 33 contacts the first sealing assembly 40, which is beneficial to reducing the risk of the first sealing assembly 40 falling off and improving the sealing effect.

In some embodiments, the spool assembly 33 includes a first sidewall 407, the first sidewall 407 extending along a circumference of the spool assembly 33, and in particular, the first sidewall 407 is annular; the first seal assembly 40 extends along the circumferential direction of the valve core assembly 33, and specifically, the first seal assembly 40 is annular; referring to fig. 1-3, the first seal assembly 40 is compressed between the spool assembly 33 and the spool seat assembly 35 in the radial direction of the first seal assembly 40; the spool assembly 33 has a communication passage 401, the communication passage 401 communicating with the first passage 411, and when the valve device 100 is in the open valve state, referring to fig. 2, the communication passage 401 communicates with the second passage 412, i.e., the first passage 411 and the second passage 412; when the valve device 100 is in the valve-closed state, referring to fig. 3, the communication passage 401 and the second passage 412 are not communicated, i.e., the second passage 412 is not communicated with the first passage 411; by providing the communication passage 401 in the spool assembly 33, the spool assembly 33 can slide with respect to the first seal assembly 40 in the axial direction of the valve device 100, thereby allowing or preventing communication between the first passage 411 and the second passage 412.

Referring to fig. 1-3, the spool assembly 33 has a second opening 405, and in particular, referring to fig. 1, in the axial direction of the valve device 100, the second opening 405 is located at an end of the spool assembly 33 facing away from the drive member 2; the second opening 405 communicates with the first passage 411, the second opening 405 communicates with the communication passage 401, referring to fig. 2 and 3, the communication passage 401 has a first opening 406 in the first side wall 407, a first section 4071 of the first side wall 407 is located on one side of the first opening 406 in the axial direction of the valve device 100, a second section 4072 of the first side wall 407 is located on the other side of the first opening 406, the first opening 406 is located farther from the second opening 405 than the first section 4071 in the axial direction of the valve device 100, the first opening 406 is capable of communicating with the second passage 412, referring to fig. 2, when the valve device 100 is in the open valve state, the first seal assembly 40 is closer to the second opening 405 than the first opening 406 in the axial direction of the valve device 100, the first section 4071 of the first side wall 407 is in contact with the first seal assembly 40 in the radial direction of the valve element assembly 33, and the first opening 406 communicates with the second passage 412; when the valve device 100 is in the valve-closed state, referring to fig. 3, the first seal assembly 40 is located farther from the second opening 405 than the first opening 406 in the axial direction of the valve device 100, the second section 4072 of the first sidewall 407 is in contact with the first seal assembly 40 in the radial direction of the spool assembly 33, the second passage 412 is located on one side of the second section 4072 in the axial direction of the valve device 100, the first opening 406 is located on the other side of the second section 4072, and the first opening 406 and the second passage 412 do not communicate. It will be appreciated that the second opening 405 may be configured as a circular, rectangular, waist-shaped opening, etc., and the first opening 406 may be configured as a circular, rectangular, waist-shaped opening, etc.; the first openings 406 are communicated with the communication channel 401, and the number of the first openings 406 can be multiple, wherein the multiple first openings 406 are two or more, and the multiple first openings 406 are distributed at equal intervals along the circumferential direction of the valve core assembly 33, so that radial impact on the valve core assembly 33 when high-pressure working medium flows into the communication channel 401 is facilitated, and stable operation of the valve core assembly 33 is facilitated.

Referring to fig. 1-3, in the axial direction of the valve apparatus 100, the first side wall 407 includes a first section 4071, a second section 4072, and a third section 4073, the first section 4071, the second section 4072, and the third section 4073 are all annular, in the axial direction of the valve apparatus 100, the third section 4073 is located between the first section 4071 and the second section 4072, the first section 4071 is closer to the second opening 405 than the second section 4072, the first opening 406 is located in the third section 4073, and when the valve apparatus 100 is in the open valve state, referring to fig. 2, the first section 4071 of the first side wall 407 is in contact with the first seal assembly 40 in the radial direction of the valve element assembly 33; when the valve device 100 is in the closed state, the second section 4072 of the first sidewall 407 is in contact with the first seal assembly 40 in the radial direction of the spool assembly 33. During the movement of the spool assembly 33 relative to the first seal assembly 40, the first seal assembly 40 can be in contact with the first section 4071, the third section 4073 and the second section 4072, respectively, which is beneficial to reducing the risk of the first seal assembly 40 falling off and improving the sealing effect.

In some embodiments, referring to fig. 4, the valve core seat assembly 35 has a first groove 404, where the first groove 404 extends along a circumference of the valve core assembly 33, the first groove 404 is open towards the valve core assembly 33, at least a portion of the first seal assembly 40 is located in the first groove 404, and along a radial direction of the valve core assembly 33, a wall forming the first groove 404 and the valve core assembly 33 compress the first seal assembly 40, and by providing the first groove 404, the wall forming the first groove 404 can play a limiting role on the first seal assembly 40, which is beneficial to reducing a risk of the first seal assembly 40 falling off, and is beneficial to improving a sealing effect.

Referring to fig. 2, the valve core assembly 33 includes a valve core 331, the valve core 331 is made of metal, the first side wall 407 is located on the valve core 331, the first seal assembly 40 includes a first seal member 403, the first seal member 403 is annular, along a radial direction of the valve core assembly 33, the first seal member 403 contacts with the first side wall 407, a hardness of the first seal member 40 is smaller than that of the valve core 331, the first seal member 40 can deform, an area where the first seal member 403 contacts with the first side wall 407 is increased, and a sealing effect is improved.

Referring to fig. 5, the first sealing member 403 is made of rubber, and specifically, the first sealing member 403 is an O-shaped sealing rubber ring; along the radial direction of the valve core assembly 33, the wall forming the first groove 404 and the first side wall 407 of the valve core assembly 33 compress the first sealing member 403, and the first sealing member 403 has a certain compression amount, which is beneficial to improving the sealing effect.

Referring to fig. 4 and 6, the first seal assembly 40 includes a first seal 403 and a second seal 402, the first seal 403 and the second seal 402 are both annular, the second seal 402 is located radially outside the first seal 403, the first seal 403 compresses the second seal 402 with a wall forming a first groove 404 along a radial direction of the second seal 402, the first seal 403 contacts a first sidewall 407 of the valve core assembly 33 along a radial direction of the valve core assembly 33, the first seal 403 is plastic or metal, and specifically, the first seal 403 is a wear-resistant material such as ptfe+ CF, PP, PE, PPS, PEEK, SUS F; the second sealing element 402 is made of rubber, and specifically, the second sealing element 402 is an O-shaped sealing rubber ring; the second seal 402 has a certain compression, which is beneficial to improving the sealing effect, and the first seal 403 made of the wear-resistant material is used for contacting the first sidewall 407 of the valve core assembly 33, which is beneficial to improving the service life of the first seal assembly 40.

Referring to fig. 6, the first sealing member 403 is made of plastic or metal, the first sealing member 403 includes an abutting portion 4030, a first extending portion 4031 and a second extending portion 4032, the abutting portion 4030 contacts the first sidewall 407 of the valve core assembly 33 along the radial direction of the valve core assembly 33, the second sealing member 402 is made of rubber, the second sealing member 402 is located between the first extending portion 4031 and the second extending portion 4032 along the axial direction of the valve device 100, the second sealing member 402 is pressed between the abutting portion 4030 and the wall forming the first groove 404 along the radial direction of the second sealing member 402, the first extending portion 4031 contacts the wall forming the first groove 404, and the second extending portion 4032 contacts the wall forming the first groove 404, so as to increase the contact area between the first sealing member 40 and the wall forming the first groove 404, and reduce the risk of the first sealing member 40 falling off. It will be appreciated that the first seal 403 may also be provided straight in the axial direction of the valve device 100, with both ends of the first seal 403 being in contact with the wall forming the first groove 404 in the axial direction of the valve device 100.

Referring to fig. 4, the first seal member 403 is made of a wear-resistant material such as plastic or metal, the first seal member 403 includes a curved portion 4033, the curved portion 4033 is in contact with the first side wall 407 in the radial direction of the valve element assembly 33, both ends of the curved portion 4033 are in contact with a wall forming the first groove 404 in the axial direction of the valve device 100, the second seal member 402 is made of a rubber material, the second seal member 402 has a certain compression amount, and the curved portion 4033 is compressed between the first side wall 407 and the second seal member 402 in the radial direction of the first seal member 403, and the curved portion 4033 is used to contact with the first side wall 407. By providing the curved portion 4033, friction between the first seal assembly 40 and the first sidewall 407 of the spool assembly 33 is facilitated to be reduced, facilitating movement of the spool assembly 33.

Referring to fig. 1 to 3, the valve device 100 includes a driving member 2, the driving member 2 is capable of driving the spool assembly 33 to move in the axial direction of the valve device 100, referring to fig. 3, the valve device 100 has a receiving chamber 409 and a balancing passage 408, the receiving chamber 409 and the first passage 411 are located on different sides of the spool assembly 33 in the axial direction of the valve device 100, the receiving chamber 409 is located closer to the driving member 2 than the first passage 411, a second passage 412 is located radially outside the spool assembly 33, at least part of the balancing passage 408 is formed in the spool assembly 33, the balancing passage 408 communicates with the receiving chamber 409, and the balancing passage 408 communicates with the communication passage 401. When the valve device 100 is in the valve-closed state, referring to fig. 3, the accommodation chamber 409 communicates with the balance passage 408, the balance passage 408 communicates with the communication passage 401, the communication passage 401 communicates with the first passage 411, and the working medium of the first passage 411 can flow into the accommodation chamber 409 via the communication passage 401 and the balance passage 408, thereby facilitating reduction of the pressure difference across the spool assembly 33 in the axial direction, the spool assembly 33 being substantially parallel to the axial direction of the valve device 100, and allowing an error within 10 °.

Referring to fig. 1-3, the spool assembly 33 has a first port 414, the first port 414 communicates with the second opening 405, the first port 414 forms at least part of the balance channel 408, the first port 408 forms at least part of the communication channel 401, and the spool assembly 33 is simple in structure and easy to manufacture.

Referring to fig. 1, the valve device 100 includes a connection seat 34, where the connection seat 34 is fixedly connected or limitedly connected with a valve core seat assembly 35, and the connection seat 34 is located at least on a radial outer side of a part of the valve core assembly 33, and specifically, the connection seat 34 can play a role in guiding the valve core assembly 33; the valve device 100 includes a second sealing assembly 413, the second sealing assembly 413 being located between the connection seat 410 and the valve cartridge assembly 33 in a radial direction of the valve cartridge assembly 33, the second sealing assembly 413 being used to separate the receiving chamber 409 and the second passage 412. It will be appreciated that the second seal member 413 may be similar to the first seal member 40, and will not be described in detail herein. In a particular embodiment, referring to FIGS. 1-3, the diameter of the first seal assembly 40 is substantially the same as the diameter of the second seal assembly 413, where substantially the same refers to allowing for errors within ten percent.

Referring to fig. 7, the valve device 100 is specifically a solenoid valve, including a closure head 445, a plunger 446, a closure head 445 and a plunger 446 as components of a driving component, the valve device 100 includes a valve cartridge seat assembly 35 and a valve cartridge assembly 33, the valve cartridge seat assembly 35 includes a first seal assembly 40, the valve cartridge assembly 33 includes a first sidewall 407, along a radial direction of the valve cartridge assembly 33, the first sidewall 407 contacts the first seal assembly 40, along an axial direction of the valve device 100, the first sidewall 407 of the valve cartridge assembly 33 is capable of sliding relative to the first seal assembly 40, the valve device 100 has a first channel 411 and a second channel 412, specifically, along an axial direction of the valve device 100, the first channel 411 is located on a side of the valve cartridge assembly 33 facing away from the driving component, the second channel 412 is located radially outside of the valve cartridge assembly 33, the valve device 100 has an open valve state and a closed valve state, and when the valve device 100 is in the open valve state, a first section 4071 of the first sidewall 407 abuts the first seal assembly 40, the first channel 411 is in communication with the second channel 412; when the valve device 100 is in the closed state, the second section 4072 of the first side wall 407 abuts the first seal assembly 40 and the first channel 411 and the second channel 412 do not communicate. During the movement of the valve core assembly 33 relative to the first sealing assembly 40, the first side wall 407 of the valve core assembly 33 contacts the first sealing assembly 40, which is beneficial to reducing the risk of the first sealing assembly 40 falling off and improving the sealing effect. The structure and modification of the valve body assembly 33 and the valve body seat assembly 35 in the first embodiment are also applicable to the solenoid valve, and other structures of the solenoid valve can be designed with reference to the foregoing embodiments, and can be modified within a frame that does not depart from the principles of the present application, and will not be repeated here.

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 the same, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present application are intended to be included in the scope of the claims of the present application.

Claims (10)

1. A valve device comprising a valve cartridge seat assembly (35) and a valve cartridge assembly (33), the valve cartridge seat assembly (35) comprising a first sealing assembly (40), the valve cartridge assembly (33) comprising a first side wall (407), the first side wall (407) being slidable relative to the first sealing assembly (40) in an axial direction of the valve device, the valve device having a first channel (411) and a second channel (412), the valve device having a valve open state and a valve closed state, the first channel (411) communicating with the second channel (412) when the valve device is in the valve open state, a first section (4071) of the first side wall (407) being in abutment with the first sealing assembly (40); when the valve device is in a closed state, the second section (4072) of the first side wall (407) abuts the first seal assembly (40), and the first channel (411) and the second channel (412) are not in communication.

2. A valve device according to claim 1, characterized in that: the valve core assembly (33) is provided with a communication channel (401), the communication channel (401) is communicated with the first channel (411), the communication channel is provided with a first opening (406) at the first side wall, a first section (4071) of the first side wall (407) is positioned at one side of the first opening (406) along the axial direction of the valve device, a second section (4072) of the first side wall (407) is positioned at the other side of the first opening (406), and when the valve device is in an open valve state, the first opening (406) is communicated with the second channel (412); when the valve device is in a closed state, the second channel (412) is located on one side of the second section (4072), and the first opening (406) is located on the other side of the second section (4072).

3. A valve device according to claim 2, characterized in that: the spool assembly (33) has a second opening (405), the second opening (405) communicates with the first passage (411), the second opening (405) communicates with the communication passage (401), and the second opening (405) is farther from the first opening (406) than the first section (4071) in an axial direction of the valve device.

4. A valve device according to claim 3, characterized in that: the first side wall (407) comprises a third section (4073), the third section (4073) is located between the first section (4071) and the second section (4072) along the axial direction of the valve device, the first opening (406) is located in the third section (4073), and when the valve device is in the valve opening state, the first section (4071) is in contact with the first sealing assembly (40) along the radial direction of the valve core assembly (33); the second segment (4072) is in contact with the first seal assembly (40) in a radial direction of the spool assembly (33) when the valve device is in a closed state.

5. The valve device of claim 4, wherein: the number of the first openings (406) is a plurality, and the first openings (406) are distributed at equal intervals along the circumferential direction of the valve core assembly (33).

6. A valve arrangement according to any one of claims 1-5, characterized in that: the valve core seat assembly (35) is provided with a first groove (404), the first groove (404) is opened towards the valve core assembly (33), at least part of the first sealing assembly (40) is positioned in the first groove (404), and the wall forming the first groove (404) and the valve core assembly (33) compress the first sealing assembly (40) along the radial direction of the valve core assembly (33).

7. The valve device of claim 6, wherein: the valve core assembly (33) comprises a valve core (331), the first side wall (407) is located on the valve core (331), the first sealing assembly (40) comprises a first sealing piece (403), the first sealing piece (403) is annular, the first sealing piece (403) is in contact with the first side wall (407) along the radial direction of the valve core assembly (33), and the hardness of the first sealing piece (40) is smaller than that of the valve core (331).

8. The valve device of claim 7, wherein: the first sealing element (403) is made of rubber, and the wall forming the first groove (404) and the first side wall (407) compress the first sealing element (403) along the radial direction of the valve core assembly (33);

or, the first sealing component (40) comprises a second sealing element (402), the second sealing element (402) is annular, the second sealing element (402) is located on the radial outer side of the first sealing element (403), along the radial direction of the second sealing element (402), the first sealing element (403) and the wall forming the first groove (404) compress the second sealing element (402), the first sealing element (403) is made of plastic or metal, and the second sealing element (402) is made of rubber.

9. The valve device of claim 8, wherein: the first seal (403) comprises an abutment portion (4030), a first extension portion (4031) and a second extension portion (4032), the abutment portion (4030) being in contact with the first sidewall (407) in the radial direction of the valve element assembly (33), the second seal (402) being located between the first extension portion (4031) and the second extension portion (4032) in the axial direction of the valve device, the first extension portion (4031) being in contact with a wall forming the first groove (404), the second extension portion (4032) being in contact with a wall forming the first groove (404);

alternatively, the first seal member (403) includes a curved portion (4033), the curved portion (4033) being in contact with the first side wall (407) in a radial direction of the spool assembly (33), both ends of the curved portion (4033) being in contact with a wall forming the first groove (404) in an axial direction of the valve device;

alternatively, the first seal member (403) is straight in the axial direction of the valve device, and both ends of the first seal member (403) are in contact with the wall forming the first groove (404) in the axial direction of the valve device.

10. A valve device according to any one of claims 1-9, characterized in that: the valve device comprises a driving component (2), the driving component (2) can drive the valve core assembly (33) to move along the axial direction of the valve device, the valve device is provided with a containing cavity (409) and a balancing channel (408), the containing cavity (409) and the first channel (411) are positioned on different sides of the valve core assembly (33), the containing cavity (409) is closer to the driving component (2) than the first channel (411), the second channel (412) is positioned on the radial outer side of the valve core assembly (33), at least part of the balancing channel (408) is formed in the valve core assembly (33), the balancing channel (408) is communicated with the containing cavity (409), and the balancing channel (408) is communicated with the communication channel (401).