Valve device

Abstract

A valve device comprises a valve core assembly, the valve core assembly comprises a screw rod, a valve core, a sleeve, a sleeve ring and a thrust bearing, the sleeve ring is located on the outer periphery of the screw rod and is fixedly connected with the screw rod, the thrust bearing is located on the outer periphery of the screw rod, the sleeve is located on the outer periphery of the screw rod, the thrust bearing is located between the sleeve and the sleeve ring, the sleeve is fixedly connected with the valve core, when the screw rod drives the valve core to move, the thrust bearing is arranged, which is beneficial to reducing the friction loss acting on the valve core assembly and improving the service life of the valve core assembly.

Description

[Technical Field]

[0001] This invention relates to the field of fluid control technology, and more specifically to a valve device. [Background Technology]

[0002] In vehicle thermal management systems, valve devices are commonly used as throttling elements. These devices can achieve throttling by controlling the forward or reverse flow of fluid, depending on the system's needs. A valve device includes a valve core assembly, which comprises a lead screw and a valve core. The lead screw is connected to the valve core and drives its movement. The inventors know that during the movement of the valve core, there is relative rotation between the lead screw and the valve core, which generates frictional losses. Reducing these frictional losses and improving the service life of the valve core assembly is a technical problem that needs to be addressed. [Summary of the Invention]

[0003] The purpose of this application is to provide a valve device that helps reduce frictional loss of the valve core assembly and improve the service life of the valve core assembly.

[0004] To achieve the above objectives, this application adopts the following technical solution: a valve device, comprising a valve core assembly, the valve core assembly comprising a lead screw and a valve core, the lead screw being capable of driving the valve core to move axially, characterized in that: the valve core assembly further comprises a sleeve, a collar, and a thrust bearing, the collar being located on the outer periphery of the lead screw and fixedly connected to the lead screw; the thrust bearing being located on the outer periphery of the lead screw, the sleeve being located on the outer periphery of the lead screw, the thrust bearing being located between the sleeve and the collar, the sleeve being fixedly connected to the valve core, the thrust bearing being able to abut against the sleeve when the valve core moves axially upward, and the thrust bearing being able to abut against the valve core when the valve core moves axially downward.

[0005] This application provides a valve device including a valve core assembly. The valve core assembly includes a lead screw, a valve core, a sleeve, a collar, and a thrust bearing. The collar is located on the outer periphery of the lead screw and is fixedly connected to the lead screw. The thrust bearing is located on the outer periphery of the lead screw, and the sleeve is located on the outer periphery of the lead screw. The thrust bearing is located between the sleeve and the collar. The sleeve is fixedly connected to the valve core. When the lead screw drives the valve core to move, the thrust bearing helps to reduce the frictional loss acting on the valve core assembly and improve the service life of the valve core assembly. [Attached Image Description]

[0006] Figure 1 This is a cross-sectional structural diagram of the valve device in the closed state;

[0007] Figure 2 yes Figure 1 A cross-sectional structural diagram of the central valve component;

[0008] Figure 3 yes Figure 1 A schematic diagram of a cross-sectional structure of the valve seat;

[0009] Figure 4 yes Figure 2 A cross-sectional structural diagram of the first sealing assembly;

[0010] Figure 5 yes Figure 2 A schematic diagram of a cross-sectional structure of the middle nut seat;

[0011] Figure 6 yes Figure 2 A partially enlarged structural diagram of section A in the middle;

[0012] Figure 7 yes Figure 2 A cross-sectional structural diagram of the valve core seat component;

[0013] Figure 8 yes Figure 1 A magnified schematic diagram of a portion of section B in the middle;

[0014] Figure 9 This is a schematic diagram of a cross-sectional structure of a valve device in a throttling state;

[0015] Figure 10 This is a schematic cross-sectional view of the valve device under high flow conditions.

[0016] Figure 11 This is a cross-sectional structural schematic diagram of another embodiment of the valve device;

[0017] Figure 12 yes Figure 11 A magnified schematic diagram of a portion of the C section.

Detailed Implementation Methods

[0018] The present application will be further described below with reference to the accompanying drawings and specific embodiments:

[0019] See Figure 1 The valve device can be applied to vehicle air conditioning system or 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 and 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.

[0020] See Figure 1The control component 1 includes a housing 11, a stator assembly 12, a circuit board 13, and an interface portion 14. The control component 1 has a control cavity 15, with the stator assembly 12 and circuit board 13 located within the control cavity 15. The stator assembly 12 is located on the outer periphery of the valve component 2 and is fixedly connected to the housing 11. The stator assembly 12 is electrically connected and / or signal connected to the circuit board 13. The interface portion 14 includes an interface portion housing 141, which can be integrally injection molded or assembled with the housing 11. The interface portion 14 also includes a pin 142, which can be injection molded and fixed to the interface portion housing 141. The interface portion 14 has a receiving cavity 143. One end of the pin 142 is located in the control cavity 15 for electrical and / or signal connection to the circuit board 13, and the other end of the pin 142 is located in the receiving cavity 143 for electrical and / or signal connection to the outside. Alternatively, the stator assembly can also be integrally injection molded with the housing and the interface portion housing.

[0021] See Figure 1 and Figure 2 The valve component 2 includes a rotor assembly 20, a transmission assembly 21, a valve core assembly 22, a connector 23, and a valve core seat assembly 24. The valve core assembly 22 includes a valve core 221 and a lead screw 222. The rotor assembly 20 is connected to the lead screw 222, the lead screw 222 is connected to the transmission assembly 21, the transmission assembly 21 is connected to the connector 23, the connector 23 is located on the outer periphery of the valve core 221, and the connector 23 is connected to the valve core seat assembly 24. The valve component 2 can form a throttling orifice 240. Under the magnetic field excitation of the stator assembly 12, the rotor assembly 20 can drive the valve core 221 to move up and down along the axial direction. The up and down movement of the valve core 221 can adjust the opening size of the throttling orifice 240.

[0022] See 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. For a single component 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 sides of the valve seat 3, which helps to avoid interference and improve the utilization rate of the valve seat 3.

[0023] See Figures 1 to 3In this embodiment, a portion of the valve component 2 is located in the mounting cavity 34, and the valve component 2 is connected to the valve seat 3. Specifically, the connecting member 23 includes a first side portion 231 with an external thread on its surface, and the mounting portion 31 includes a second side portion 311 with an internal thread on its surface. The valve component 2 extends into the mounting cavity 34, and the first side portion 231 and the second side portion 311 are threadedly engaged, i.e., the connecting member 23 is threadedly connected to the mounting portion 31, thereby achieving the connection between the valve component 2 and the valve seat 3. Of course, in other embodiments, the valve component 2 and the valve seat 3 can also be connected by tightening a compression nut. Furthermore, to prevent fluid leakage from the assembly gap between the valve component 2 and the mounting portion 31, a sealing device can also be provided between the valve component 2 and the mounting portion 31.

[0024] See Figure 2 and Figure 4 The valve component 2 also includes a first sealing assembly 25, which includes a first sealing element 251 and a first sealing ring 252. The first sealing ring 252 is integrally injection molded. In this embodiment, the first sealing ring 252 is made of polytetrafluoroethylene (PTFE). Of course, in other embodiments, the first sealing ring 252 can also be made of a mixture of PTFE and other materials or other plastic materials that combine hardness and elasticity. The first sealing ring 252 includes a first groove portion 2521. The first sealing element 251 is located on the outer periphery of the first sealing ring 252, and a portion of the first sealing element 251 is located in the first cavity formed by the first groove portion 2521. See also Figure 2 The connector 23 further includes a flange 232 and has an inner cavity 233. At least a portion of the valve core 221 is located in the inner cavity 233. The first sealing assembly 25 is located on the outer periphery of the valve core 221. The first sealing ring 252 is press-fitted with the valve core 221 and seals against the outer peripheral wall of the valve core 221. The first sealing assembly 25 abuts against the first side portion 231 and is pressed between the first groove portion 2521 and the side wall of the connector 23, and is in a sealed and pressed state. Further, to prevent the first sealing assembly 25 from moving in the axial direction, the valve component 2 may also include a first retaining ring 26. The first retaining ring 26 is located on the outer periphery of the valve core 221 and is fixedly connected to the connector 23. The first sealing assembly 25 can be axially limited by the flange 232 and the first retaining ring 26.

[0025] See Figure 2 The lead screw 222 has an external thread section formed on part of its outer peripheral wall. The transmission assembly 21 includes a nut seat 211. See [link / reference] Figure 5 The nut seat 211 has a channel 212 and a peripheral sidewall forming the channel 212, a portion of which has an internal thread segment. See also Figure 2The lead screw 222 extends upward from the lower end of the nut seat 211 through the channel 212. The lead screw 222 is threadedly engaged with the nut seat 211, and one end of the lead screw 222 extending through the channel 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 assembly 21 also includes a connecting plate 213. The connecting plate 213 can be used as an injection-molded insert to integrally form the nut seat 211. 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 another embodiment, the connecting member 23 can also be used as an injection-molded insert to integrally form the nut seat 211, that is, the nut seat 211 and the connecting member 23 are injection-molded and fixed, or the connecting member 23 and the nut seat 211 are fixed by assembly.

[0026] See Figure 2 and Figure 6The valve core assembly 22 also includes a sleeve 223, a thrust bearing 224, and a collar 225. The thrust bearing 224 includes a first washer 2241, a second washer 2242, and a rolling element 2243. The first washer 2241 and the second washer 2242 have the same structure. The rolling element 2243 is located between the first washer 2241 and the second washer 2242. The rolling element 2243 includes balls 2244. The rolling element 2243 abuts against the first washer 2241 and the second washer 2242 respectively through the balls 2244. The balls 2244 can roll relative to the first washer 2241 and / or the second washer 2242. Under the action of the balls 2244, the first washer 2241 and / or the second washer 2242 can rotate relative to the rolling element 2243. The lead screw 222 is connected to the valve core 221 via a sleeve 223, a thrust bearing 224, and a collar 225. Specifically, the collar 225 is located on the outer periphery of the lead screw 222 and is fixedly connected to the lead screw 222. In this embodiment, the collar 225 and the lead screw 222 are welded together. Of course, in other embodiments, the collar 225 and the lead screw 222 can also be assembled and fixed together. The thrust bearing 224 is located on the outer periphery of the lead screw 222 and can be clearance-fitted with the lead screw 222. The lead screw 222 includes a first stepped portion 2221, and the thrust bearing 224 is axially limited by the first stepped portion 2221 and the collar 225. The sleeve 223 is located on the outer periphery of the lead screw 222 and is positioned above the thrust bearing 224. Alternatively, the thrust bearing 224 is located between the sleeve 223 and the collar 225. The movement of the sleeve 223 toward the thrust bearing can be axially limited by the thrust bearing 224. The sleeve 223 is clearance-fitted with the lead screw 222. The valve core 221 has a first cavity 2211. The collar 225 and the thrust bearing 224 are located in the first cavity 2211. At least part of the sleeve 223 is located in the first cavity 2211. 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 valve core 221 used to form the first cavity. In this embodiment, the outer peripheral wall of the sleeve 223 and the side wall of the valve core 221 used to form the first cavity are fixed by welding. Of course, as another embodiment, the sleeve 223 and the valve core 221 can also be fixed by assembly. Along the radial direction of the first cavity 2211, the thrust bearing 224 and the collar 225 can be provided with gaps between themselves and the side wall forming the first cavity. This helps to avoid frictional loss between the thrust bearing 224 and / or the collar 225 and the side wall during rotation.

[0027] See Figure 1 , Figure 2 as well as Figure 6The control unit 1 can control the valve core 221 to reciprocate up and down along the axial direction. Specifically, the control unit 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 lead screw 222 to rotate. The lead screw 222 is threadedly engaged with the nut seat 211, and the nut seat 211 is fixedly connected to the connecting piece 23. In this way, under the action of the thread, the lead screw 222 can reciprocate up and down along the axial direction while rotating circumferentially with the rotor assembly 20. When the lead screw 222 moves upward along the axial direction, the upper end face of the collar 225 can abut against the second washer 2242 of the thrust bearing 224, and the first washer 2241 of the thrust bearing 224 can abut against the lower end face of the sleeve 223. The sleeve 223 is fixedly connected to the valve core 221. That is, as the lead screw 222 moves upward, the lead screw 222 can drive the valve core 221 to move upward along the axial direction. While the lead screw 222 moves upward along the axial direction, it also maintains circumferential rotation. Due to the presence of the first sealing assembly 25, the valve core 221 is not conducive to circumferential rotation with the lead screw 222. That is, there is relative rotation between the lead screw 222 and the valve core 221. However, the lead screw 222 needs to drive the valve core 221 to move upward. Therefore, the valve core assembly 22 has a contact surface with relative rotation, which may generate sliding friction loss. In this technical solution, by setting a thrust bearing 224, the first washer 2241 abuts against the lower end face of the sleeve 223, and the second washer 2242 abuts against the upper end face of the collar 225. The first washer 2241 and the second washer 2242 abut against each other through a ball bearing 2244. In this way, when the collar 225 is fixedly connected to the lead screw 222, the sliding friction that originally acted on the collar 225 and the second washer 2242 can be converted into rolling friction between the second washer 2242 and the ball bearing 2244. That is, the collar 225 and the second washer 2242 can rotate circumferentially with the lead screw 222, and the second washer 2242 can rotate relative to the rolling element 2243. In this way, the thrust bearing 224 can convert the sliding friction acting on the valve core assembly 22 into rolling friction, which helps to reduce friction loss and thus improve the service life of the valve core assembly 22.Similarly, when the lead screw 222 moves downward along the axial direction, the first step portion 2221 of the lead screw 222 can abut against the first washer 2241. The valve core 221 is also provided with a second step portion 2210, and the second washer 2242 can abut against the second step portion 2210. As the lead screw 222 moves downward, the lead screw 222 pushes the valve core 221 to move downward along the axial direction through the thrust bearing 224. At this time, the sliding friction that originally acted on the first step portion 2221 and the first washer 2241 can be converted into rolling friction between the first washer 2241 and the ball 2244. That is, the lead screw 222 can drive the first washer 2241 to rotate circumferentially together, and the first washer 2241 can rotate relative to the rolling element 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.

[0028] See Figure 1 , Figure 2 as well as Figure 7The valve core seat component 24 is connected to the connector 23. Specifically, the valve core seat component 24 includes a valve core seat 241, a second sealing component 242, and a valve nozzle 243. The second sealing component 242 includes a second sealing element 2421 and a second sealing ring 2422. The material of the second sealing component 242 can be the same as that of the first sealing component 25. The valve core seat 241 includes a fifth step portion 2411, and the valve nozzle 243 includes a valve port portion 2431 and a main body portion 2432. For each individual component of the valve core seat 241, the valve core seat 241 also has an assembly cavity. A second sealing assembly 242 and at least a portion of the valve nozzle 243 are located in the assembly cavity. The second sealing assembly 242 is located on the outer periphery of the valve nozzle 243. A second sealing ring 2422 is press-fitted with the valve nozzle 243. Specifically, the second sealing ring 2422 is press-fitted with the main body portion 2432 of the valve nozzle, and the second sealing ring 2422 is in sealing contact with the outer peripheral wall of the main body portion 2432. The end face of the second sealing assembly 242 abuts against the fifth step portion 2411. The second sealing member 2421 is pressed between the second groove portion 2423 of the second sealing ring and the side wall of the valve core seat 241 used to form the assembly cavity, and the second sealing member 2421 is in a sealed and pressed state. The valve core seat 241 also includes a connecting portion 2412, which is fixedly connected to the connecting member 23, thereby connecting the connecting member 23 and the valve core seat component 24. In this embodiment, the valve core seat 241 is welded to the connecting member 23 through 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. Further, to prevent the second sealing assembly 242 from moving in the axial direction, the valve core seat component 24 can also include a second retaining ring 244. In this embodiment, the valve core seat 241 also includes a fourth step portion 2413. At least a portion of the second retaining ring 244 is located in the assembly cavity formed by the valve core seat 241. The end face of the second retaining ring 244 abuts against the fourth step portion 2413. The second retaining ring 244 is fixedly connected to the valve core seat 241, and the second sealing assembly 242 can be axially limited by the second retaining ring 244 and the fifth step portion 2411.

[0029] See Figure 1 and Figure 8The valve core 221 has a second cavity 2212 and a sidewall forming the second cavity 2212. When at least a portion of the valve port 2431 is located in the second cavity 2212, the valve port 2431 can be clearance-fitted with the valve core 221. The outer sidewall of the valve port 2431 and the sidewall forming the second cavity 2212 cooperate to form a throttling orifice 240. Specifically, the throttling orifice 240 is located at the position where the free end of the sidewall forming the second cavity of the valve core cooperates with the outer sidewall of the valve port. To improve the throttling control accuracy of the valve device 100, the valve port 2431 includes an inclined section. 2435, In this 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 second cavity; the other end of the inclined section 2435 can extend to the free top of the valve port. The cross-sectional width d of the inclined section 2435 gradually decreases from bottom to top along the axial direction. Thus, when the valve port 2431 and the valve core 221 are engaged, the projection of the outer side wall of the inclined section 2435 on the plane of the cross section and the projection of the side wall forming the second cavity 2212 on the same plane form an angle θ.

[0030] See Figure 1 When valve core 221 is at its lowest position, the first channel 35 and the second channel 36 are not connected. See details below. Figure 7 and Figure 8 The second sealing ring 2422 also includes a protrusion 2424, and the free end of the valve core 221 is further provided with a chamfered portion 2213. When the valve core 221 is at its lowest position, the chamfered portion 2213 can seal against the protrusion 2424 of the second sealing ring, thereby preventing the first channel 35 and the second channel 36 from communicating. Alternatively, in other embodiments, the second sealing ring 2422 may not include the protrusion 2424, meaning the free end of the valve core 221 can directly seal against the upper surface of the second sealing ring 2422 (the valve core 221 may also not include the chamfered portion 2213), or the free end of the valve core 221 can directly seal against the valve port 2431. See also... Figure 8 and Figure 9As the valve core 221 moves upward axially, the chamfered portion 2213 separates from the protrusion 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 throttling orifice 240. Furthermore, as the valve core 221 continues to move upward, the opening of the throttling orifice 240 gradually increases. This is beneficial for improving the throttling effect of the valve device and for making the flow rate throttling tend to be linear. It should be noted that the flow rate of the throttling section of the throttling orifice 240 can be adjusted by setting the included angle θ, which can be set in the range of 1° to 3°. Further, the width of the throttling section of the throttling orifice 240 can be adjusted by setting the axial height h of the inclined section 2435, which can be set to 0.4 to 0.6 times the axial height H of the second cavity 2212. As the valve core 221 continues to move upward axially, see... Figure 10 When the valve port 2431 is not located in the second chamber 2212, the first channel 35 and the second channel 36 are directly connected through the flow channel 2433 of the valve nozzle 243, meaning the flow rate will increase rapidly. It should be noted that when the valve device 100 acts as a throttling element, its main operating range is the throttling section. The valve device 100 can be configured with a limiting mechanism to ensure that the displacement range of the valve core 221's axial reciprocating motion is within the throttling section.

[0031] See Figure 9 During operation, when the first port 32 serves as the fluid inlet, the second port 33 serves as the fluid outlet. The flow direction is defined as forward flow. High-pressure fluid flows in from the first port 32, passes through the first channel 35, and enters 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 throttling orifice 240 and becomes low-pressure fluid. It then flows through the flow channel 2433 of the valve nozzle 243 to the second channel 36 and exits from the second port 33, flowing into the subsequent circuit. In this embodiment, there are four connecting holes 234 arranged symmetrically. This symmetrical arrangement of the connecting holes 234 helps to offset or reduce the impact of the high-pressure fluid entering the inner cavity 233 from the connecting holes 234 on the valve core 221, ensuring smooth operation of the valve core 221.

[0032] See Figure 9When the second port 33 is used as the fluid inlet, the first port 32 is used as the fluid outlet. The flow direction is defined as reverse flow. High-pressure fluid flows in from the second port 33, passes through the second channel 36, and enters the second chamber 2212 of the valve core through the flow channel 2433 of the valve nozzle. The high-pressure fluid in the second chamber 2212 acts on the valve core 221, generating an upward pressure. To counteract or reduce the pressure exerted on the valve core 221 and ensure smooth operation, the valve core 221 also includes a balancing channel. (See [link to relevant documentation]). Figure 9 The balancing channel includes a first cavity 2211, a second cavity 2212, a connecting channel 2214, and a flow channel hole 2215. The number of flow channel holes 2215 is at least one. The valve component 2 also has a receiving cavity 27. The flow channel 2433 of the valve nozzle connects to the second channel 36 and the second cavity 2212. The connecting channel 2214 connects the second cavity 2212 and the first cavity 2211. The flow channel hole 2215 connects the first cavity 2211 and the receiving cavity 27. Thus, a portion of the high-pressure fluid can flow into the receiving cavity 27 through the balancing channel. The high-pressure fluid in the receiving cavity 27 acts directly and / or indirectly on the valve core 221, generating a downward force on it. This causes the valve core 221 to be subjected to pressure from the high-pressure fluid in the opposite direction, which helps to balance or nearly balance the pressure on the valve core 221, ensuring smooth operation. A portion of the high-pressure fluid can be throttled through the throttling port 240, becoming a low-pressure fluid that enters the inner cavity 233 and flows out from the first port 32 through the connecting hole 234 and the first channel 35, flowing towards the subsequent circuit. It should be noted that the high-pressure fluid in the receiving cavity 27 and the low-pressure fluid in the inner cavity 233 are isolated by the first sealing assembly 25. This first sealing assembly 25 helps prevent the high-pressure fluid in the receiving cavity 27 from leaking into the low-pressure fluid in the inner cavity 233, thus preventing the loss of the throttling effect due to the mixing of fluids with different pressures.

[0033] See Figure 11 and Figure 12This is a second embodiment of the valve device. The main difference between the second and first embodiments is that in the second embodiment, the valve core assembly 22 further includes an elastic element 226 and a washer 227. The valve core also includes a third step portion 228. The elastic element 226 and the washer 227 are located in the first cavity 2211. The washer 227 is located on the outer periphery of the collar 225, with a gap between the inner circumferential side of the washer 227 and the outer circumferential side of the collar 225. Along the radial direction of the first cavity 2211, a gap is left between the outer circumferential wall of the washer 227 and the side wall of the valve core forming the first cavity. A gap is also left between the elastic element 226 and the side wall of the valve core forming the first cavity. One end of the elastic element 226 abuts against the third step portion 228, and the other end of the elastic element 226 abuts against the lower end face of the washer 227. The elastic element 226 is in an elastic compression deformation state. Under the action of the elastic element 226, the upper end face of the washer 227 can abut against the second washer 2242 of the thrust bearing 224, and the first washer 2241 of the thrust bearing 224 can abut against the sleeve 223 and / or the first step portion 2221 respectively. By setting the elastic element 226, a certain preload can be provided between the components of the valve core assembly 22, which is beneficial to compensate for or reduce the limiting movement of the valve core 221 during axial movement, and make the flow regulation more smooth or stable. Of course, as another embodiment, the valve core assembly 22 may not include the washer 227, that is, one end of the elastic element 226 abuts against the third step portion 228, and the other end of the elastic element 226 directly abuts against the second washer 2242 of the thrust bearing.

[0034] It should be noted that the above embodiments are only used to illustrate this application and are not intended to limit the technical solutions described in this application. For example, the directional definitions such as "front", "back", "left", "right", "up", and "down" are used. Although this specification has described this application in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to this application. All technical solutions and improvements that do not depart from the spirit and scope of this application should be covered within the scope of the claims of this application.

Claims

1. A valve device comprising a valve core assembly, the valve core assembly including a lead screw and a valve core, the lead screw capable of driving the valve core to move axially, characterized in that: The valve core assembly further includes a sleeve, a collar, and a thrust bearing. The collar is located on the outer periphery of the lead screw and is fixedly connected to the lead screw. The thrust bearing is located on the outer periphery of the lead screw, and the sleeve is located on the outer periphery of the lead screw. The thrust bearing is located between the sleeve and the collar. The sleeve is fixedly connected to the valve core. The lead screw includes a first stepped portion, and the thrust bearing is axially limited by the first stepped portion and the collar. When the valve core moves upward along the axial direction, the collar abuts against the thrust bearing, and the thrust bearing abuts against the sleeve. When the valve core moves downward along the axial direction, the first step abuts against the thrust bearing, and the thrust bearing abuts against the valve core.

2. The valve device according to claim 1, characterized in that: The sleeve is clearance-fitted with the lead screw, the thrust bearing is clearance-fitted with the lead screw, the valve core has a first cavity, the collar and the thrust bearing are located in the first cavity, at least a portion of the sleeve is located in the first cavity, and the outer wall of the sleeve is welded and fixed to the side wall of the valve core forming the first cavity.

3. The valve device according to claim 2, characterized in that: The thrust bearing includes a first washer, a second washer, and a rolling element. The rolling element is located between the first washer and the second washer. The rolling element includes balls that abut against the first washer and the second washer respectively. The balls are capable of rolling relative to the first washer and / or the second washer, and the first washer and / or the second washer are capable of rotating relative to the rolling element.

4. The valve device according to claim 3, characterized in that: The valve core includes a second stepped portion. When the lead screw moves upward along the axial direction, the collar abuts against the second gasket, and the first gasket abuts against the sleeve. When the lead screw moves downward along the axial direction, the first stepped portion abuts against the first gasket, and the second gasket abuts against the second stepped portion.

5. The valve device according to claim 4, characterized in that: The valve core assembly further includes an elastic element and a washer. The valve core also includes a third stepped portion. The elastic element and the washer are located in the first cavity. The washer is located on the outer periphery of the collar. One end of the elastic element abuts against the washer, and the other end of the elastic element abuts against the third stepped portion. The elastic element is in an elastic compression deformation state. Under the action of the elastic element, the washer can abut against the second gasket, and the first gasket can abut against the first stepped portion and / or the sleeve.

6. The valve device according to claim 3 or 4, characterized in that: Along the radial direction of the first cavity, there is a gap between the outer peripheral wall of the collar and the side wall of the valve core forming the first cavity, and there is a gap between the thrust bearing and the side wall of the valve core forming the first cavity.

7. The valve device according to claim 5, characterized in that: Along the radial direction of the first cavity, there is a gap between the inner circumferential side of the washer and the outer circumferential side of the collar, a gap between the outer circumferential wall of the washer and the side wall of the valve core forming the first cavity, a gap between the thrust bearing and the side wall of the valve core forming the first cavity, and a gap between the elastic element and the side wall of the valve core forming the first cavity.

8. The valve device according to claim 6, characterized in that: When the lead screw moves upward along the axial direction, the collar abuts against the second washer, the collar and the second washer rotate circumferentially with the lead screw, the ball rolls relative to the second washer, and the second washer rotates relative to the rolling element; When the lead screw moves downward along the axial direction, the first stepped portion abuts against the first washer, the first washer rotates circumferentially with the lead screw, the ball rolls relative to the first washer, and the first washer rotates relative to the rolling element.

9. The valve device according to claim 7, characterized in that: When the lead screw moves upward along the axial direction, the collar abuts against the second washer, the collar and the second washer rotate circumferentially with the lead screw, the ball rolls relative to the second washer, and the second washer rotates relative to the rolling element; When the lead screw moves downward along the axial direction, the first stepped portion abuts against the first washer, the first washer rotates circumferentially with the lead screw, the ball rolls relative to the first washer, and the first washer rotates relative to the rolling element.

10. The valve device according to claim 8 or 9, characterized in that: The valve device further includes a valve nozzle, the valve nozzle including an inclined section, and the valve core further includes a second cavity, at least a portion of the inclined section being located in the second cavity. The inclined section and the valve core cooperate to form a throttling orifice on the side wall of the second cavity. The throttling orifice is located at the position where the free end of the side wall forming the second cavity cooperates with the inclined section. The valve device further includes a first channel and a second channel, the first channel and the second channel being located on different sides of the throttling orifice, and the throttling orifice being able to connect the first channel and the second channel.

11. The valve device according to claim 1, characterized in that: The thrust bearing includes a first washer, a second washer, and a rolling element. The rolling element is located between the first washer and the second washer. The rolling element includes balls that abut against the first washer and the second washer respectively. The balls are capable of rolling relative to the first washer and / or the second washer, and the first washer and / or the second washer are capable of rotating relative to the rolling element.

12. The valve device according to claim 11, characterized in that: The valve core includes a second stepped portion. When the lead screw moves upward along the axial direction, the collar abuts against the second gasket, and the first gasket abuts against the sleeve. When the lead screw moves downward along the axial direction, the first stepped portion abuts against the first gasket, and the second gasket abuts against the second stepped portion.

13. The valve device according to claim 2, characterized in that: Along the radial direction of the first cavity, there is a gap between the outer peripheral wall of the collar and the side wall of the valve core forming the first cavity, and there is a gap between the thrust bearing and the side wall of the valve core forming the first cavity.

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