Valve device

Abstract

A valve device comprises a valve element seat part and a valve element assembly, the valve element assembly comprises a valve element, the valve element seat part comprises a valve element seat and a first sealing assembly, the first sealing assembly comprises a first sealing ring, the valve element seat part further comprises a first check ring, the first check ring is arranged in an assembling cavity formed by the valve element seat, and the first check ring is fixedly connected with the valve element seat. The first check ring abuts against the first sealing ring to limit the axial position of the first sealing assembly. In this way, the structure of the first check ring is relatively simple, and the assembling structure of the first sealing ring can be simplified.

Description

[0001] (This application is a divisional application of the Chinese invention patent application with the filing date of July 9, 2020, application number 202010655247.2, and title “Valve Device”)

Technical field

[0002] The present invention relates to the field of fluid control technology, and more particularly to a valve device. [Background Technology]

[0003] In a vehicle thermal management system, the valve device usually uses a valve core and a sealing gasket to abut against each other for sealing. However, the assembly structure of the sealing gasket is relatively complex and the processing cost of the related structure is high. Therefore, the assembly of the sealing gasket is a technical problem that needs to be solved by technical personnel in this field. [Summary of the invention]

[0004] The purpose of the present application is to provide a valve device that is conducive to simplifying the assembly structure of the first sealing ring.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] A valve device includes a valve component, the valve component includes a valve core seat component and a valve core assembly, the valve core assembly includes a valve core, the valve core seat component includes a valve core seat, a first sealing component, the first sealing component includes a first sealing ring, and the valve core seat component also includes a first retaining ring, the first retaining ring is arranged in an assembly cavity formed by the valve core seat, the first retaining ring and the valve core seat are fixedly connected, the first retaining ring abuts against the first sealing ring to limit the axial position of the first sealing assembly.

[0007] The present application provides a valve device, including a valve core seat component and a valve core assembly, the valve core assembly includes a valve core, the valve core seat component includes a valve core seat, a first sealing assembly, the first sealing assembly includes a first sealing ring, the valve core seat component also includes a first retaining ring, the first retaining ring is arranged in an assembly cavity formed by the valve core seat, the first retaining ring and the valve core seat are fixedly connected, the first retaining ring abuts against the first sealing ring, and limits the axial position of the first sealing assembly; with this arrangement, the structure of the first retaining ring is relatively simple, which is conducive to simplifying the assembly structure of the first sealing ring.

Brief Description of the Drawings

[0008] Figure 1 It is a cross-sectional structural diagram of the valve device in a closed state;

[0009] Figure 2 yes Figure 1 A schematic diagram of a cross-sectional structure of the middle valve component;

[0010] Figure 3 yes Figure 1 A schematic diagram of the cross-section structure of the middle valve seat;

[0011] Figure 4 yes Figure 2 A schematic cross-sectional view of the second sealing assembly;

[0012] Figure 5 yes Figure 2 A schematic diagram of a cross-sectional structure of the middle nut seat;

[0013] Figure 6 yes Figure 2 A schematic diagram of the partially enlarged structure of the middle part A;

[0014] Figure 7 yes Figure 2 A schematic diagram of a cross-sectional structure of the middle valve core seat component;

[0015] Figure 8 yes Figure 1 A schematic diagram of the partially enlarged structure of part B in the middle;

[0016] Figure 9 It is a cross-sectional structural diagram of the valve device in a throttling state;

[0017] Figure 10 It is a cross-sectional structural diagram of the valve device in a high flow flow state;

[0018] Figure 11 is a schematic cross-sectional view of another embodiment of the valve device;

[0019] Figure 12 yes Figure 11 Schematic diagram of the partially enlarged structure of part C in the middle. [Specific implementation method]

[0020] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0021] See also Figure 1 The valve device can be applied to a vehicle air-conditioning system or a vehicle heat pump system. The valve device 100 includes a control component 1, a valve component 2 and a valve seat 3. The valve component 2 is connected to the valve seat 3. The control component 1 is located on the outer periphery of the valve component 2. The control component 1 is connected to the valve seat 3. The valve device 100 realizes electrical connection and / or signal connection with the outside world through the control component 1.

[0022] See also Figure 1The control component 1 includes an outer shell 11, a stator assembly 12, a circuit board 13, and an interface portion 14. The control component 1 has a control cavity 15, the stator assembly 12 is located in the control cavity 15, the circuit board 13 is located in the control cavity 15, the stator assembly 12 is located on the periphery of the valve component 2, the stator assembly 12 is fixedly connected to the outer shell 11, and the stator assembly 12 is electrically and / or signal-connected to the circuit board 13. The interface portion 14 includes an interface portion housing 141. The interface portion housing 141 and the outer shell 11 can be integrally injection molded or assembled and fixed. The interface portion 14 also includes a pin 142. The pin 142 and the interface portion housing 141 can be injection-molded and fixed. The interface portion 14 has a plug-in cavity 143. One end of the pin 142 is located in the control cavity 15 for electrical and / or signal connection with the circuit board 13. The other end of the pin 141 is located in the plug-in cavity 143 for electrical and / or signal connection with the outside world. Of course, the stator assembly can also be injection-molded as a whole with the outer shell and the interface portion housing.

[0023] See also Figure 1 and Figure 2 The valve component 2 includes a rotor assembly 20, a transmission assembly 21, a valve core assembly 22, a connecting piece 23 and a valve core seat assembly 24, wherein the valve core assembly 22 includes a valve core 221 and a screw rod 222, the rotor assembly 20 is connected to the screw rod 222, the screw rod 222 is connected to the transmission assembly 21, the transmission assembly 21 is connected to the connecting piece 23, the connecting piece 23 is located on the outer periphery of the valve core 221, and the connecting piece 23 is connected to the valve core seat assembly 24. The valve component 2 can form a throttle port 240. Under the magnetic field excitation of the stator assembly 12, the rotor assembly 20 can drive the valve core 221 to reciprocate up and down along the axial direction. The up and down movement of the valve core 221 can adjust the opening size of the throttle port 240.

[0024] See also Figure 3 The valve seat 3 includes a mounting portion 31, a first port 32, a second port 33, a first channel 35, and a second channel 36. The first channel 35 forms the first port 32 on the surface of the valve seat 3, and the second channel 36 forms the second port 33 on the surface of the valve seat 3. The mounting portion 31 forms a mounting cavity 34. Regarding the individual components of the valve seat 3, the first channel 35 and the second channel 36 can communicate through the mounting cavity 34. In this embodiment, the first port 32 is located on one side of the valve seat 3, the second port 33 is located on the other side of the valve seat 3, and the opening of the mounting cavity 34 is located on yet another side of the valve seat 3. These three sides are different from each other, which helps avoid interference and improves the utilization of the valve seat 3.

[0025] See also Figures 1 to 3, part of the valve component 2 is located in the installation cavity 34, and the valve component 2 is connected to the valve seat 3. Specifically, in this embodiment, the connecting piece 23 includes a first side portion 231, and the surface of the first side portion 231 is formed with an external thread. The installation portion 31 includes a second side portion 311, and the surface of the second side portion 311 is formed with an internal thread. The valve component 2 extends into the installation cavity 34, and the first side portion 231 and the second side portion 311 are threadedly matched, that is, the connecting piece 23 is threadedly connected to the installation portion 31, thereby realizing the connection between the valve component 2 and the valve seat 3. Of course, as other embodiments, the valve component 2 and the valve seat 3 can also be connected by tightening with a compression nut. Furthermore, in order to prevent the fluid from leaking from the assembly gap between the valve component 2 and the installation portion 31, a sealing arrangement can also be provided between the valve component 2 and the installation portion 31.

[0026] See also Figure 2 and Figure 4 The valve component 2 also includes a second sealing assembly 25, which includes a second sealing member 251 and a second sealing ring 252. The second sealing ring 252 is integrally injection molded. In this embodiment, the second sealing ring 252 is made of polytetrafluoroethylene (PTFE). Of course, in other embodiments, the second sealing ring 252 can also be made of a mixture of polytetrafluoroethylene and other materials, or other plastic materials with both hardness and elasticity. The second sealing ring 252 includes a second groove portion 2521. The second sealing member 251 is located on the outer periphery of the second sealing ring 252, and a portion of the second sealing member 251 is located in the first groove cavity formed by the second groove portion 2521. Figure 2 The connecting member 23 further includes a flange portion 232. The connecting member 23 has an inner cavity 233, in which at least a portion of the valve core 221 is located. The second sealing assembly 25 is located on the outer periphery of the valve core 221. The second sealing ring 252 is interference-fitted with the valve core 221. The second sealing ring 252 is in sealing contact with the outer peripheral wall of the valve core 221. The second sealing assembly 25 is in contact with the flange portion 231. The second sealing member 251 is compressed between the second groove portion 2521 and the side wall of the connecting member 23, and the second sealing member 251 is in a sealed and compressed state. Furthermore, to prevent the second sealing assembly 25 from moving in the axial direction, the valve component 2 may further include a second retaining ring 26. The second retaining ring 26 is located on the outer periphery of the valve core 221 and is fixedly connected to the connecting member 23. The second sealing assembly 25 can be axially limited by the first flange portion 232 and the second retaining ring 26.

[0027] See also Figure 2 , an external thread section is formed on part of the outer peripheral wall of the screw rod 222, and the transmission component 21 includes a nut seat 211, see Figure 5 The nut seat 211 has a hole 212 and a peripheral side wall forming the hole 212, and a portion of the peripheral side wall is formed with an internal thread section. Figure 2The screw rod 222 passes through the hole 212 upward from the lower end of the nut seat 211. The screw rod 222 is threadedly engaged with the nut seat 211. One end of the screw rod 222 passing through the hole 212 is fixedly connected to the rotor assembly 20. The nut seat 211 is fixedly connected to the connecting member 23. Specifically, in this embodiment, the transmission component 21 also includes a connecting plate 213. The connecting plate 213 can be used as an injection-molded insert to form the nut seat 211 as a whole. The connecting plate 213 and the connecting member 23 are welded and fixed, thereby achieving a fixed connection between the nut seat 211 and the connecting member 23. Of course, as other embodiments, the connecting member 23 can also be used as an injection-molded insert to form the nut seat 211 as a whole. That is, the nut seat 211 and the connecting member 23 can be fixed by injection molding, or the connecting member 23 and the nut seat 211 can be fixed by assembly.

[0028] See also Figure 2 and Figure 6The valve core assembly 22 also includes a sleeve 223, a thrust bearing 224 and a ring 225, wherein the thrust bearing 224 includes a first gasket 2241, a second gasket 2242 and a rolling body 2243, the first gasket 2241 and the second gasket 2242 have the same structure, the rolling body 2243 is located between the first gasket 2241 and the second gasket 2242, the rolling body 2243 includes a ball 2244, the rolling body 2243 is respectively in contact with the first gasket 2241 and the second gasket 2242 through the ball 2244, the ball 2244 can roll relative to the first gasket 2241 and / or the second gasket 2242, and under the action of the ball 2244, the first gasket 2241 and / or the second gasket 2242 can rotate relative to the rolling body 2243. The screw rod 222 is connected to the valve core 221 through the sleeve 223, the thrust bearing 224 and the collar 225. Specifically, the collar 225 is located at the outer periphery of the screw rod 222, and the collar 225 is fixedly connected to the screw rod 222. In this embodiment, the collar 225 and the screw rod 222 are welded and fixed. Of course, as other embodiments, the collar 225 and the screw rod 222 can also be assembled and fixed; the thrust bearing 224 is located at the outer periphery of the screw rod 222, and the thrust bearing 224 and the screw rod 222 can be clearance-fitted. The screw rod 222 includes a third step portion 2221, and the thrust bearing 224 is axially limited by the third step portion 2221 and the collar 225; the sleeve 223 is located at the outer periphery of the screw rod 222, and the sleeve 223 is located above the thrust bearing 224. In other words, the thrust bearing 224 is located between the sleeve 223 and the ring 225, and the movement of the sleeve 223 in the direction of the thrust bearing can be axially limited by the thrust bearing 224, and the sleeve 223 and the screw rod 222 are clearance-matched; the valve core 221 has a second cavity 2211, the ring 225 and the thrust bearing 224 are located in the second cavity 2211, at least part of the sleeve 223 is located in the second cavity 2211, and the sleeve 223 is fixedly connected to the valve core 221. Specifically, the outer wall of the sleeve 223 is fixedly connected to the side wall of the second cavity formed by the valve core 221. In this embodiment, the outer peripheral wall of the sleeve 223 and the side wall of the valve core 221 used to form the second cavity are fixed by welding. Of course, as other embodiments, the sleeve 223 and the valve core 221 can also be fixed by assembly. Along the radial direction of the second cavity 2211, gaps can be left between the thrust bearing 224 and the collar 225 and the side walls forming the second cavity, which helps to avoid friction loss between the thrust bearing 224 and / or the collar 225 and the side walls during rotation.

[0029] See also Figure 1 、 Figure 2 as well as Figure 6The control component 1 can control the valve core 221 to reciprocate up and down along the axial direction. Specifically, the control component 1 can control the stator assembly 12 to generate an excitation magnetic field. Under the excitation of the magnetic field of the stator assembly 12, the rotor assembly 20 can drive the screw rod 222 to rotate. The screw rod 222 is threadedly engaged with the nut seat 211, and the nut seat 211 is fixedly connected to the connecting member 23. In this way, under the action of the thread, the screw rod 222 can reciprocate up and down along the axial direction while rotating circumferentially with the rotor assembly 20. When the screw rod 222 moves upward in the axial direction, the upper end surface of the collar 225 can abut against the second gasket 2242 of the thrust bearing 224, and the first gasket 2241 of the thrust bearing 224 can abut against the lower end surface of the sleeve 223. The sleeve 223 is fixedly connected to the valve core 221. That is, as the screw rod 222 moves upward, the screw rod 222 can drive the valve core 221 to move upward in the axial direction. The screw rod 222 maintains circumferential rotation while moving axially upward. Due to the presence of the second sealing assembly 25, the valve core 221 is not conducive to circumferential rotation along with the screw rod 222, that is, there is relative rotation between the screw rod 222 and the valve core 221, and the screw rod 222 needs to drive the valve core 221 to move upward, so the valve core assembly 22 has a relatively rotating abutment surface, which may cause sliding friction loss. In the present technical solution, by providing a thrust bearing 224, the first gasket 2241 abuts against the lower end surface of the sleeve 223, and the second gasket 2242 abuts against the upper end surface of the collar 225, and the first gasket 2241 and the second gasket 2242 abut against each other through the ball 2244. In this way, when the collar 225 is fixedly connected to the screw rod 222, the sliding friction originally acting between the collar 225 and the second gasket 2242 can be converted into rolling friction between the second gasket 2242 and the ball 2244, that is, the collar 223 and the second gasket 2242 can rotate circumferentially with the screw rod 222, and the second gasket 2242 can rotate relative to the rolling body 2243. In this way, the thrust bearing 224 can convert the sliding friction acting on the valve core assembly 22 into rolling friction, which is beneficial to reducing friction loss and thus improving the service life of the valve core assembly 22.Similarly, when the screw rod 222 moves axially downward, the third step portion 2221 of the screw rod 222 can abut against the first gasket 2241, and the valve core 221 is also provided with a fourth step portion 2210, and the second gasket 2242 can abut against the fourth step portion 2210. As the screw rod 222 moves downward, the screw rod 222 pushes the valve core 221 to move axially downward through the thrust bearing 224. At this time, the sliding friction originally acting between the third step portion 2221 and the first gasket 2241 can be converted into rolling friction between the first gasket 2241 and the ball 2244, that is, the screw rod 222 can drive the first gasket 2241 to rotate circumferentially together, and the first gasket 2241 can rotate relative to the rolling body 2243, thereby converting the sliding friction acting on the valve core assembly 22 into rolling friction, which is beneficial to reduce friction loss and improve the service life of the valve core assembly 22.

[0030] See also Figure 1 、 Figure 2 as well as Figure 7The valve core seat component 24 is connected to the connecting member 23. Specifically, the valve core seat component 24 includes a valve core seat 241, a first sealing component 242 and a valve mouth 243. The first sealing component 242 includes a first sealing component 2421 and a first sealing ring 2422. The material of the first sealing component 242 can be the same as that of the second sealing component 25. The valve core seat 241 includes a first step portion 2411, and the valve nozzle 243 includes a valve mouth portion 2431 and a main body portion 2432. As for the single component of the valve core seat 241, the valve core seat 241 also has an assembly cavity, the first sealing component 242 and at least part of the valve nozzle 243 are located in the assembly cavity, the first sealing component 242 is located on the outer periphery of the valve nozzle 243, and the first sealing ring 2422 is interference fit with the valve nozzle 243. Specifically, the first sealing ring 2422 is interference fit with the main body portion 2432 of the valve nozzle, and the first sealing ring 2422 is sealingly abutted against the outer peripheral wall of the main body portion 2432. The end face of the first sealing component 242 is abutted against the first step portion 2411, and the first sealing component 2421 is pressed between the first groove portion 2423 of the first sealing ring and the side wall of the valve core seat 241 for forming the assembly cavity. The first sealing component 2421 is in a sealed and compressed state. The valve core seat 241 also includes a connecting portion 2412, through which the valve core seat 241 is fixedly connected to the connecting member 23, thereby achieving the connection between the connecting member 23 and the valve core seat component 24. In this embodiment, the valve core seat 241 is welded and fixed to the connecting member 23 via the connecting portion 2412. Of course, in other embodiments, the valve core seat 241 and the connecting member 23 can also be assembled and fixed. Furthermore, to prevent the first sealing component 242 from moving in the axial direction, the valve core seat component 24 can also include a first retaining ring 244. In this embodiment, the valve core seat 241 also includes a second step portion 2413. At least part of the first retaining ring 244 is located in the assembly cavity formed by the valve core seat 241. The end face of the first retaining ring 244 abuts against the second step portion 2413. The first retaining ring 224 is fixedly connected to the valve core seat 241. The first sealing component 242 can be axially limited by the first retaining ring 244 and the first step portion 2411.

[0031] See also Figure 1 and Figure 8The valve core 221 has a first cavity 2212 and a side wall forming the first cavity 2212. When at least part of the valve mouth portion 2431 is located in the first cavity 2212, the valve mouth portion 2431 and the valve core 221 are clearance-matched. The outer side wall of the valve mouth portion 2431 and the side wall forming the first cavity 2212 cooperate with each other to form a throttle port 240. Specifically, the throttle port 240 is located at a position where the free end of the side wall of the valve core forming the first cavity cooperates with the outer side wall of the valve mouth portion. In order to improve the throttling control accuracy of the valve device 100, the valve mouth portion 2431 includes an inclined section 2431. 435. In the present embodiment, when the valve core 221 is located at the lowest position, one end of the inclined section 2435 is flush with the free end of the side wall of the valve core forming the first cavity; the other end of the inclined section 2435 can extend to the free top end of the valve mouth portion, and the cross-sectional width d of the inclined section 2435 gradually decreases from bottom to top along the axial direction. In this way, when the valve mouth portion 2431 is matched with the valve core 221, an angle θ is formed between the projection of the outer wall of the inclined section 2435 on the plane where the cross section is located and the projection of the side wall forming the first cavity 2212 on the same plane.

[0032] See also Figure 1 When the valve core 221 is at the bottom, the first channel 35 and the second channel 36 are not connected. Figure 7 and Figure 8 The first sealing ring 2422 also includes a protrusion 2424, and the free end of the valve core 221 is also provided with a chamfered portion 2213. When the valve core 221 is at the lowest end, the chamfered portion 2213 can be in sealing contact with the protrusion 2424 of the first sealing ring, thereby preventing the first channel 35 and the second channel 36 from communicating through the valve port 240. Of course, as other embodiments, the first sealing ring 2422 may not include the protrusion 2424, that is, the free end of the valve core 221 is directly in sealing contact with the upper end surface of the first sealing ring 2422 (the valve core 211 may also not include the chamfered portion 2213), or the free end of the valve core 221 is directly in sealing contact with the valve port 2431. Figure 8 and Figure 9As the valve core 221 moves upward in the axial direction, the chamfered portion 2213 separates from the raised portion 2424, and the valve core 221 moves relative to the inclined section 2435. At this time, the first channel 35 and the second channel 36 can be connected through the throttle port 240, and as the valve core 221 continues to move upward, the opening of the throttle port 240 gradually increases, which is beneficial to improving the throttling effect of the valve device and making the flow throttling tend to change linearly. It should be noted that the flow rate of the throttling section of the throttle port 240 can be adjusted by setting the size of the angle θ, and the range of the angle θ can be set to 1° to 3°. Furthermore, the interval width of the throttle section of the throttle port 240 can be adjusted by setting the size of the axial height h of the inclined section 2435. The axial height h of the inclined section 2435 can be set to 0.4 to 0.6 times the axial height H of the first chamber 2212. As the valve core 221 continues to move upward in the axial direction, see Figure 10 When the valve port 2431 is not located in the first chamber 2212, the first channel 35 and the second channel 36 are directly connected through the flow passage 2433 of the valve orifice 243, which rapidly increases the flow rate. It should be noted that when the valve device 100 functions as a throttling element, its primary operating range is the throttling section. The valve device 100 can be provided with a limit mechanism to ensure that the axial reciprocating displacement range of the valve core 221 is within the throttling section.

[0033] See also Figure 9 During operation of the valve device 100, when the first port 32 serves as the fluid inlet and the second port 33 serves as the fluid outlet, the flow direction is defined as forward. High-pressure fluid flows from the first port 32, passes through the first passage 35, and flows into the inner cavity 233 through the connecting hole 234 of the connector 23. There is at least one connecting hole 234. The high-pressure fluid in the inner cavity 233 is throttled by the throttle port 240, becoming a low-pressure fluid. The fluid flows through the flow passage 2433 of the valve nozzle 243 to the second passage 36, and then out of the second port 33 to the subsequent circuit. In this embodiment, there are four symmetrically arranged connecting holes 234. The symmetrical arrangement of the connecting holes 234 helps to offset or reduce the impact of the high-pressure fluid on the valve core 221 when entering the inner cavity 233 from the connecting hole 234, ensuring smooth operation of the valve core 221.

[0034] See also Figure 9When the second port 33 serves as a fluid inlet, the first port 32 serves as a fluid outlet. The flow direction is defined as reverse flow. High-pressure fluid flows from the second port 33, passes through the second channel 36, and enters the first chamber 2212 of the valve core through the flow passage 2433 of the valve nozzle. The high-pressure fluid in the first chamber 2212 can act on the valve core 221, generating an upward pressure on the valve core 221. To offset or reduce the pressure of the high-pressure fluid on the valve core 221 and ensure smooth operation of the valve core 221, the valve core 221 also includes a balancing channel. Figure 9 The balancing channel includes a second chamber 2211, a first chamber 2212, a connecting channel 2214 and a flow channel hole 2215. The number of the flow channel hole 2215 is at least one. The valve component 2 also has an accommodating chamber 27. The flow channel 2433 of the valve nozzle connects the second channel 36 and the first chamber 2212. The connecting channel 2214 connects the first chamber 2212 and the second chamber 2211. The flow channel hole 2215 connects the second chamber 2211 and the accommodating chamber 27. In this way, part of the high-pressure fluid can flow into the accommodating chamber 27 through the balancing channel. The high-pressure fluid in the accommodating chamber 27 acts directly and / or indirectly on the valve core 221, generating a downward force on the valve core 221. This causes the valve core 221 to be subjected to the pressure of the high-pressure fluid in the opposite direction, which helps balance or tend to balance the pressure of the high-pressure fluid on the valve core 221, allowing the valve core 221 to operate smoothly. A portion of the high-pressure fluid can be throttled through the throttle port 240 and converted into low-pressure fluid, entering the inner chamber 233. It then flows out of the first port 32 through the communicating hole 234 and the first channel 35, flowing to the subsequent circuit. It should be noted that the high-pressure fluid in the accommodating chamber 27 is isolated from the low-pressure fluid in the inner chamber 233 by the second sealing assembly 25. The provision of the second sealing assembly 25 helps prevent the high-pressure fluid in the accommodating chamber 27 from leaking into the low-pressure fluid in the inner chamber 232, thereby preventing the loss of the throttling effect due to mixing of fluids of different pressures.

[0035] See also Figure 11 and Figure 12, which is a second embodiment of the valve device. The second embodiment is different from the first embodiment in that: in the second embodiment, the valve core assembly 22 further includes an elastic element 226 and a gasket 227, and the valve core further includes a fifth step portion 228. The elastic element 226 and the gasket 227 are located in the second cavity 2211, and the gasket 227 is located on the outer periphery of the collar 225. A gap is left between the inner peripheral side of the gasket 227 and the outer peripheral side of the collar 225. Along the radial direction of the second cavity 2211, a gap is left between the outer peripheral wall of the gasket 227 and the side wall of the second cavity formed by the valve core, and a gap is left between the elastic element 226 and the side wall of the second cavity formed by the valve core. One end of the elastic element 226 abuts against the fifth step 228, and the other end of the elastic element 226 abuts against the lower end surface of the washer 227. The elastic element 226 is in an elastically compressed state. Under the action of the elastic element 226, the upper end surface of the washer 227 can abut against the second gasket 2242 of the thrust bearing 224, and the first gasket 2241 of the thrust bearing 224 can abut against the sleeve 223 and / or the third step 2221, respectively. By providing the elastic element 226, a certain preload force can be provided between the various components of the valve core assembly 22, which helps to compensate for or reduce the limited displacement of the valve core 221 during axial movement, thereby making the flow regulation smoother or more stable. Of course, as another embodiment, the valve core assembly 22 can also not include the gasket 227, that is, one end of the elastic element 226 abuts against the fifth step 228, and the other end of the elastic element 226 directly abuts against the second gasket 2242 of the thrust bearing.

[0036] It should be noted that the above embodiments are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. For example, with respect to the directional definitions of “front”, “back”, “left”, “right”, “up”, and “down”, although this specification has described the present application in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that a person of ordinary skill in the art can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included within the scope of the claims of the present application.

Claims

1. A valve device, characterized in that: It includes a valve component, which includes a valve core seat component and a valve core assembly, the valve core assembly includes a valve core, the valve core seat component includes a valve core seat, a first sealing component, the first sealing component includes a first sealing ring, and the valve core seat component also includes a first retaining ring, which is arranged in an assembly cavity formed by the valve core seat, the first retaining ring and the valve core seat are fixedly connected, and the first retaining ring abuts against the first sealing ring to limit the axial position of the first sealing assembly.

2. The valve device according to claim 1, characterized in that An outer side wall of one end of the first retaining ring facing the first sealing ring has a rounded corner.

3. The valve device according to claim 2, characterized in that An outer side wall of one end of the first retaining ring facing the first sealing ring has a reduced diameter portion, and the rounded corner is located at the end of the reduced diameter portion.

4. The valve device according to any one of claims 1 to 3, characterized in that: The outer side of the first sealing ring has a step portion, and the first retaining ring is in position-limiting cooperation with the step portion.

5. The valve device according to claim 4, characterized in that The first sealing ring further includes a protrusion, and a height of the protrusion is greater than a height of a bottom wall of the step portion.

6. The valve device according to any one of claims 1 to 5, characterized in that: The first sealing ring is made of polytetrafluoroethylene or a mixture of polytetrafluoroethylene and other materials or a plastic material with both hardness and elasticity.

7. The valve device according to any one of claims 1 to 6, characterized in that: The first sealing ring has a conical surface, and the free end of the valve core can be in sealing contact with the conical surface; or the upper end surface of the first sealing ring is a plane, and the free end of the valve core can be in sealing contact with the upper end surface of the first sealing ring.

8. The valve device according to claim 7, characterized in that The free end of the valve core has a chamfered portion, the first sealing ring further includes a raised portion, and the conical surface is located on the raised portion.

9. The valve device according to any one of claims 1 to 8, characterized in that: The valve core further includes a balancing channel, which balances the pressure at both ends of the valve core.

10. The valve device according to claim 9, characterized in that The valve component also includes a connecting piece, which is welded and fixed to the valve core seat. The connecting piece is provided with a positioning step, and at least part of the valve core seat is located on the positioning step; the valve core seat has a positioning protrusion, which protrudes from the main body of the valve core seat, and the positioning protrusion forms the bottom wall of the positioning step, and the connecting piece abuts against the positioning protrusion for positioning.

11. The valve device according to claim 10, characterized in that The first sealing assembly also includes a first sealing member, the first sealing ring is arranged in the cavity of the valve core seat, the valve core can abut against the first sealing ring, and the first sealing member is located between the first sealing ring and the valve core seat; the outer diameter of the first sealing member is larger than the outer diameter of the first sealing ring.

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