CN113915342A

CN113915342A - Valve device

Info

Publication number: CN113915342A
Application number: CN202010655253.8A
Authority: CN
Inventors: 不公告发明人
Original assignee: Zhejiang Sanhua Automotive Components Co Ltd
Current assignee: Zhejiang Sanhua Automotive Components Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-01-11

Abstract

The utility model provides a valve device, includes the case subassembly, the case subassembly includes the lead screw, the case, the sleeve, the lantern ring and thrust bearing, the lantern ring be located the periphery of lead screw and with lead screw fixed connection, thrust bearing is located the lead screw periphery, the sleeve is located the lead screw periphery, thrust bearing is located between sleeve and the lantern ring, sleeve and case fixed connection, when the lead screw drives the case motion, through setting up thrust bearing, be favorable to reducing the friction loss that acts on the case subassembly, improve the life of case subassembly.

Description

Valve device

[ technical field ] A method for producing a semiconductor device

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

[ background of the invention ]

In vehicle thermal management systems, a valve device is often used as a throttling element, and the valve device can realize a throttling function through forward flow or reverse flow of fluid according to the requirements of the system. The valve device comprises a valve core assembly, wherein the valve core assembly comprises a screw rod and a valve core, the screw rod is connected with the valve core and can drive the valve core to move, the inventor knows that the screw rod rotates relative to the valve core in the process of driving the valve core to move, so that friction loss can be generated, the friction loss can be reduced, and the service life of the valve core assembly is prolonged.

[ summary of the invention ]

An object of the application is to provide a valve gear, be favorable to reducing the friction loss of case subassembly, improve the life of case subassembly.

In order to achieve the purpose, the following technical scheme is adopted in the application: the utility model provides a valve device, includes the case subassembly, the case subassembly includes lead screw and case, the lead screw can drive case is along axial motion, its characterized in that: the valve core assembly further comprises a sleeve, a sleeve ring and a thrust bearing, the sleeve ring is located on the periphery of the screw rod, and the sleeve ring is fixedly connected with the screw rod; the thrust bearing is located at the periphery of the screw rod, the sleeve is located at the 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 valve core moves upwards along the axial direction, the thrust bearing can be abutted to the sleeve, and when the valve core moves downwards along the axial direction, the thrust bearing can be abutted to the valve core.

The application provides a valve device, including the case subassembly, the case subassembly includes the lead screw, the case, the sleeve, the lantern ring and thrust bearing, the lantern ring be located the periphery of lead screw and with lead screw fixed connection, thrust bearing is located the lead screw periphery, the sleeve is located the lead screw periphery, thrust bearing is located between sleeve and the lantern ring, sleeve and case fixed connection, the lead screw is when driving the case motion, through setting up thrust bearing, be favorable to reducing the friction loss that acts on the case subassembly, improve the life of case subassembly.

[ description of the drawings ]

FIG. 1 is a schematic cross-sectional view of a valve assembly in a closed position;

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

FIG. 3 is a cross-sectional structural view of the valve seat of FIG. 1;

FIG. 4 is a cross-sectional structural view of the first seal assembly of FIG. 2;

FIG. 5 is a cross-sectional structural view of the nut seat of FIG. 2;

FIG. 6 is a partially enlarged schematic view of a portion A of FIG. 2;

FIG. 7 is a cross-sectional structural view of the cartridge seat member of FIG. 2;

FIG. 8 is a partially enlarged schematic view of a portion B of FIG. 1;

FIG. 9 is a cross-sectional structural view of the valve assembly in a throttled state;

FIG. 10 is a schematic cross-sectional view of the valve assembly in a high flow state;

FIG. 11 is a cross-sectional structural view of another embodiment of a valve device;

fig. 12 is a partially enlarged schematic view of a portion C in fig. 11.

[ detailed description ] embodiments

The present application is further described with reference to the following figures and specific examples:

referring to fig. 1, the valve apparatus 100 may be applied to a vehicle air conditioning system or a vehicle heat pump system, the valve apparatus 100 includes a control member 1, a valve member 2, and a valve seat 3, the valve member 2 is connected to the valve seat 3, the control member 1 is located at an outer circumference of the valve member 2, the control member 1 is connected to the valve seat 3, and the valve apparatus 100 is electrically and/or signally connected to the outside through the control member 1.

Referring to fig. 1, the control component 1 includes an outer casing 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 at the outer periphery of the valve component 2, the stator assembly 12 is fixedly connected to the outer casing 11, the stator assembly 12 is electrically and/or signally connected to the circuit board 13, the interface portion 14 includes an interface portion outer casing 141, the interface portion outer casing 141 and the outer casing 11 can be integrally injection molded or assembled and fixed, the interface portion 14 further includes a pin 142, the pin 142 and the interface portion outer casing 141 can be injection molded and fixed, the interface portion 14 has a socket 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, and the other end of the pin 141 is located in the pin receiving cavity 143 for electrical and/or signal connection with the outside. Of course, the stator assembly may be integrally injection molded with the housing and the mouthpiece housing.

Referring to fig. 1 and 2, the valve member 2 includes a rotor assembly 20, a transmission assembly 21, a valve core assembly 22, a connecting member 23, and a valve core seat member 24, where 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 member 23, the connecting member 23 is located at an outer periphery of the valve core 221, the connecting member 23 is connected to the valve core seat member 24, the valve member 2 may form an orifice 240, under excitation of a magnetic field of the stator assembly 12, the rotor assembly 20 can drive the valve core 221 to reciprocate up and down along an axial direction, and the opening of the orifice 240 can be adjusted by the up-down movement of the valve core 221.

Referring to fig. 3, the valve seat 3 includes a mounting portion 31, a first port 32, a second port 33, a first passage 35, and a second passage 36, the first passage 35 forming the first port 32 at a surface of the valve seat 3, the second passage 36 forming the second port 33 at a surface of the valve seat 3, the mounting portion 31 forming a mounting chamber 34, and the first passage 35 and the second passage 36 being communicable through the mounting chamber 34 with respect to a single component of the valve seat 3. 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, the opening of the mounting cavity 34 is located on the other side of the valve seat 3, and the three sides are different sides of the valve seat 3, so that interference is avoided, and the utilization rate of the valve seat 3 is improved.

Referring to fig. 1 to 3, part of the valve member 2 is located in the mounting cavity 34, the valve member 2 is connected with the valve seat 3, specifically, in the present embodiment, the connecting member 23 includes a first side portion 231, a surface of the first side portion 231 is formed with an external thread, the mounting portion 31 includes a second side portion 311, a surface of the second side portion 311 is formed with an internal thread, the valve member 2 extends into the mounting cavity 34, and the first side portion 231 and the second side portion 311 are in threaded fit, that is, the connecting member 23 is in threaded connection with the mounting portion 31, so as to achieve connection between the valve member 2 and the valve seat 3. Of course, as another embodiment, the valve member 2 and the valve seat 3 may be connected by being pressed by a pressing nut. Further, in order to prevent the fluid from leaking from the fitting gap between the valve member 2 and the mounting portion 31, a seal may be provided between the valve member 2 and the mounting portion 31.

Referring to fig. 2 and 4, the valve component 2 further includes a first sealing assembly 25, the first sealing assembly 25 includes a first sealing member 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), but as another embodiment, the first sealing ring 252 may also be made of a mixture of PTFE and another material or another plastic material with hardness and elasticity. The first sealing ring 252 includes a first groove portion 2521, the first sealing member 251 is located at an outer circumference of the first sealing ring 252, and a portion of the first sealing member 251 is located in a first groove cavity formed by the first groove portion 2521. Referring to fig. 2, the connecting member 23 further includes a flange portion 232, the connecting member 23 has an inner cavity 233, at least a portion of the valve body 221 is located in the inner cavity 233, the first sealing assembly 25 is located on an outer periphery of the valve body 221, the first sealing ring 252 is in interference fit with the valve body 221, the first sealing ring 252 is in sealing abutment with an outer peripheral wall of the valve body 221, the first sealing assembly 25 is in abutment with the flange portion 231, the first sealing member 251 is compressed between the first groove portion 2521 and a side wall of the connecting member 23, and the first sealing member 251 is in a sealing compression state. Further, to prevent the first sealing assembly 25 from moving in the axial direction, the valve component 2 may further include a first retainer ring 26, the first retainer ring 26 is located at the outer periphery of the valve core 221 and is fixedly connected with the connecting piece 23, and the first sealing assembly 25 may be axially limited by the first flange portion 232 and the first retainer ring 26.

Referring to fig. 2, a part of the outer circumferential wall of the lead screw 222 is formed with an external thread section, and the transmission member 21 includes a nut holder 211, and referring to fig. 5, the nut holder 211 has a bore 212 and a circumferential side wall forming the bore 212, and a part of the circumferential side wall is formed with an internal thread section. Referring to fig. 2, the lead screw 222 extends upward from the lower end of the nut holder 211 through the hole 212, the lead screw 222 is in threaded engagement with the nut holder 211, and one end of the lead screw 222 extending through the hole 212 is fixedly connected with the rotor assembly 20. The nut seat 211 is fixedly connected to the connecting member 23, specifically, in this embodiment, the transmission component 21 further includes a connecting plate 213, the connecting plate 213 may be used as an injection insert to form the nut seat 211 by integral injection, and the connecting plate 213 is welded and fixed to the connecting member 23, so as to achieve the fixed connection between the nut seat 211 and the connecting member 23.

Referring to fig. 2 and 6, the valve core assembly 22 further includes a sleeve 223, a thrust bearing 224 and a collar 225, wherein 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 are identical in structure, the rolling element 2243 is located between the first washer 2241 and the second washer 2242, the rolling element 2243 includes a ball 2244, the rolling element 2243 abuts against the first washer 2241 and the second washer 2242 through the ball 2244, the ball 2244 can roll with respect to the first washer 2241 and/or the second washer 2242, and under the action of the ball 2244, the first washer 2241 and/or the second washer 2242 can rotate with respect to the rolling element 2243. The screw rod 222 is connected with the valve core 221 through a sleeve 223, a thrust bearing 224 and a collar 225, specifically, the collar 225 is located on the periphery of the screw rod 222, the collar 225 is fixedly connected with the screw rod 222, in this embodiment, the collar 225 and the screw rod 222 are welded and fixed, and as another embodiment, the collar 225 and the screw rod 222 may also be assembled and fixed; the thrust bearing 224 is positioned on the periphery of the screw rod 222, the thrust bearing 224 and the screw rod 222 can be in clearance fit, the screw rod 222 comprises a first step 2221, and the thrust bearing 224 performs axial limitation through the first step 2221 and the collar 225; the sleeve 223 is positioned on the periphery of the screw 222, the sleeve 223 is positioned above the thrust bearing 224, or the thrust bearing 224 is positioned between the sleeve 223 and the sleeve ring 225, the movement of the sleeve 223 towards the thrust bearing direction can be limited axially through the thrust bearing 224, and the sleeve 223 is in clearance fit with the 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 a part of the sleeve 223 is located in the first cavity 2211, the sleeve 223 is fixedly connected with the valve core 221, specifically, an outer side wall of the sleeve 223 is fixedly connected with a side wall of the valve core 221 for forming the first cavity, in this embodiment, an outer peripheral wall of the sleeve 223 is fixedly connected with the side wall of the valve core 221 for forming the first cavity by welding, and of course, as other embodiments, the sleeve 223 and the valve core 221 may also be fixed by assembling. In the radial direction of the first cavity 2211, the thrust bearing 224 and the collar 225 may be disposed with a gap between the side wall forming the first cavity and the side wall, so as to avoid friction loss between the thrust bearing 224 and/or the collar 225 and the side wall during rotation.

Referring to fig. 1, 2 and 6, the 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 lead screw 222 to rotate, the lead screw 222 is in threaded fit with the nut seat 211, and the nut seat 211 is fixedly connected with the connecting piece 23, so that under the action of the threads of the lead screw 222, the lead screw 222 can also reciprocate up and down along the axial direction while rotating along with the circumferential direction of 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, the first gasket 2241 of the thrust bearing 224 can abut against the lower end surface of the sleeve 223, and the sleeve 223 is fixedly connected with the valve core 221, that is, along with the upward movement of the screw rod 222, the screw rod 222 can drive the valve core 221 to move upward in the axial direction. The screw rod 222 moves upward along the axial direction and keeps rotating in the circumferential direction, due to the existence of the first sealing assembly 25, the valve core 221 is not beneficial to rotating in the circumferential direction along with the screw rod 222, that is, the screw rod 222 and the valve core 221 rotate relatively, and the screw rod 222 needs to drive the valve core 221 to move upward, so that the valve core assembly 22 has a relatively rotating abutting surface, which may generate sliding friction loss. In this technical scheme, through setting up thrust bearing 224, make the lower terminal surface butt of first gasket 2241 and sleeve 223, the second gasket 2242 and the up end butt of the lantern ring 225, through ball 2244 butt between first gasket 2241 and the second gasket 2242, like this, under the condition of lantern ring 225 and lead screw 222 fixed connection, can convert the sliding friction that originally acts on between lantern ring 225 and the second gasket 2242 into the rolling friction between second gasket 2242 and ball 2244, the lantern ring 223 and second gasket 2242 can be followed lead screw 222 and do circumferential direction together, and second gasket 2242 can rotate for rolling element 2243, like this, through thrust bearing 224, can convert the sliding friction that produces on acting on case subassembly 22 into rolling friction, be favorable to reducing the friction loss, thereby improve the life of case subassembly 22. Similarly, when the screw rod 222 moves downward in the axial direction, the first step 2221 of the screw rod 222 can abut against the first pad 2241, the spool 221 is further provided with the second step 2210, the second pad 2242 can abut against the second step 2210, along with the downward movement of the screw rod 222, the screw rod 222 pushes the spool 221 downward in the axial direction through the thrust bearing 224, at this time, the sliding friction originally acting between the first step 2221 and the first pad 2241 can be converted into the rolling friction between the first pad 2241 and the ball 2244, that is, the screw rod 222 can drive the first pad 2241 to rotate circumferentially together, and the first pad 2241 can rotate relative to the rolling element 2243, so as to convert the sliding friction acting on the spool assembly 22 into the rolling friction, which is beneficial to reducing the friction loss and improving the service life of the spool assembly 22.

Referring to fig. 1, 2 and 7, the 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 assembly 242 and a valve mouth 243, the second sealing assembly 242 includes a second sealing member 2421 and a second sealing ring 2422, and the material of the second sealing assembly 242 may be the same as that of the first sealing assembly 25. The valve core seat 241 includes a fifth step portion 2411, the valve mouth 243 includes a valve port portion 2431 and a main body portion 2432, and for a single component of the valve core seat 241, the valve core seat 241 further has a fitting cavity, the second seal assembly 242 and at least a part of the valve mouth 243 are located in the fitting cavity, the second seal assembly 242 is located at an outer periphery of the valve mouth 243, the second seal ring 2422 is in interference fit with the valve mouth 243, specifically, the second seal ring 2422 is in interference fit with the main body portion 2432 of the valve mouth, the second seal ring 2422 is in sealing abutment with an outer peripheral wall of the main body portion 2432, an end face of the second seal assembly 242 is in abutment with the fifth step portion 2411, the second seal 2421 is compressed between the second groove portion 3 of the second seal ring and a side wall of the valve core seat 241 for forming the fitting cavity, and the second seal 2421 is in a sealing compression state. The valve core seat 241 further includes a connecting portion 2412, and the valve core seat 241 is fixedly connected to the connecting member 23 through the connecting portion 2412, so that the connecting member 23 is connected to the valve core seat component 24. In this embodiment, the valve core seat 241 is fixed to the connector 23 by welding through the connection portion 2412, but as another embodiment, the valve core seat 241 and the connector 23 may also be fixed by assembling. Further, to prevent the second sealing assembly 242 from moving in the axial direction, the valve core seat component 24 may further include a second retaining ring 244, in this embodiment, the valve core seat 241 further includes a fourth step 2413, at least a portion of the second retaining ring 244 is located in the assembly cavity formed by the valve core seat 241, an end surface of the second retaining ring 244 abuts against the fourth step 2413, the second retaining ring 244 is fixedly connected to the valve core seat 241, and the second sealing assembly 242 may be axially limited by the second retaining ring 244 and the fifth step 2411.

Referring to fig. 1 and 8, the valve plug 221 has a second cavity 2212 and a side wall 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 may be in clearance fit with the valve plug 221, an outer side wall of the valve port 2431 and the side wall forming the second cavity 2212 cooperate to form the throttle orifice 240, specifically, the throttle orifice 240 is located at a position where a free end of the side wall forming the second cavity of the valve plug and the outer side wall of the valve port cooperate, and to improve the throttle control accuracy of the valve apparatus 100, the valve port 2431 includes an inclined section 2435, and in this embodiment, when the valve plug 221 is located at a lowermost position, an end of the inclined section 2435 is flush with the free end of the side wall forming the second cavity of the valve plug; the other end of the inclined section 2435 may extend to the free top end of the valve port, and the cross-sectional width d of the inclined section 2435 gradually decreases from bottom to top along the axial direction, so that when the valve port 2431 is engaged with the valve plug 221, an included angle θ is formed between a projection of the outer sidewall of the inclined section 2435 on the plane of the cross-section and a projection of the sidewall forming the second cavity 2212 on the same plane.

Referring to fig. 1, when the spool 221 is located at the lowermost end, the first passage 35 and the second passage 36 are not communicated, and specifically, referring to fig. 7 and 8, the second sealing ring 2422 further includes a protruding portion 2424, the free end portion of the spool 221 is further provided with a chamfered portion 2213, and when the spool 221 is located at the lowermost end, the chamfered portion 2213 can be in sealing abutment with the protruding portion 2424 of the second sealing ring, so that the first passage 35 and the second passage 36 are not communicated. Of course, as another embodiment, the second sealing ring 2422 may not include the protrusion 2424, that is, the free end of the valve element 221 directly abuts against the upper end surface of the second sealing ring 2422 in a sealing manner (the valve element 211 may not include the chamfered portion 2213), or the free end of the valve element 221 directly abuts against the valve port 2431 in a sealing manner. Referring to fig. 8 and 9, as the valve core 221 moves upward in the axial direction, the chamfer 2213 is separated from the boss 2424, the valve core 221 moves relative to the inclined section 2435, the first passage 35 and the second passage 36 can communicate with each other through the throttle orifice 240, and the opening degree of the throttle orifice 240 gradually increases as the valve core 221 continues to move upward, 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 throttling orifice 240 can be adjusted by setting the included angle θ, the included angle θ can be set to range from 1 ° to 3 °, further, the interval width of the throttling section 240 can be adjusted by setting the axial height H of the inclined section 2435, and the axial height H of the inclined section 2435 can be set to be 0.4 to 0.6 times of the axial height H of the second cavity 2212. As the valve element 221 continues to move axially upward, referring to fig. 10, when the valve port 2431 is not located in the second chamber 2212, the first passage 35 and the second passage 36 are directly communicated through the flow passage 2433 of the valve mouth 243, i.e., the flow rate will rapidly increase. It should be noted here that when the valve device 100 is used as a throttling element, the main operation region of the valve device 100 is a throttling section region, the valve device 100 may be configured such that the displacement range of the valve element 221 reciprocating up and down along the axial direction is located in the throttling section region by providing a limit mechanism.

Referring to fig. 9, in the operation of the valve device 100, when the first port 32 is used as an inlet of the fluid, and the second port 33 is used as an outlet of the fluid, the flow direction is defined as a forward flow, the high-pressure fluid flows into the first port 32, flows through the first passage 35, and flows into the inner cavity 233 through the communication hole 234 of the connecting member 23, the number of the communication holes 234 is at least one, and the high-pressure fluid in the inner cavity 233 is throttled by the throttle 240 to become a low-pressure fluid, flows into the second passage 36 through the flow passage 2433 of the valve nozzle 243, and flows out from the second port 33 to a subsequent circuit. In this embodiment, the number of the communication holes 234 is four and the communication holes 234 are symmetrically arranged, so that the impact of the high-pressure fluid entering the inner cavity 233 from the communication holes 234 on the valve element 221 is offset or reduced, and the valve element 221 can move smoothly.

Referring to fig. 9, when the second port 33 is used as a fluid inlet, and the first port 32 is used as a fluid outlet, the flow direction is defined as a reverse flow, after the high-pressure fluid flows from the second port 33, the high-pressure fluid flows through the second passage 36 and enters the second cavity 2212 of the valve core through the flow passage 2433 of the valve nozzle, the high-pressure fluid in the second cavity 2212 can act on the valve core 221, an upward pressure will be generated on the valve core 221, in order to counteract or reduce the pressure of the high-pressure fluid acting on the valve core 221, so that the valve core 221 can act smoothly, the valve core 221 further includes a balance passage, referring to fig. 9, the balance passage includes a first cavity 2211, a second cavity 2212, a connecting passage 2214 and a flow passage 2215, the number of the flow passage 2215 is at least one, the valve component 2 further includes a receiving cavity 27, the flow passage 2433 of the valve nozzle communicates the second passage 36 with the second cavity 2212, the connecting passage 2214 communicates with the second cavity 2212 and the first cavity 2211, the flow passage hole 2215 is communicated with the first cavity 2211 and the accommodating cavity 27, so that part of high-pressure fluid can flow into the accommodating cavity 27 through the balance passage, and the high-pressure fluid in the accommodating cavity 27 directly and/or indirectly acts on the valve core 221 to generate a downward force on the valve core 221, so that the valve core 221 is acted by the pressure of the high-pressure fluid in the opposite direction, and the pressure of the high-pressure fluid on the valve core 221 is balanced or tends to be balanced, and the valve core 221 can smoothly act; part of the high-pressure fluid can be throttled by the throttle 240 to become low-pressure fluid, enter the inner chamber 233, and flow out of the first port 32 through the communication hole 234 and the first passage 35 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 first sealing assembly 25, that is, by providing the first sealing assembly 25, it is advantageous to prevent the high-pressure fluid in the accommodating chamber 27 from leaking to the low-pressure fluid in the inner chamber 232, and to prevent the fluid with different pressures from being mixed to lose the throttling effect.

Referring to fig. 11 and 12, a second embodiment of the valve device is shown, which differs from the first embodiment mainly in that: in the second embodiment, the valve core assembly 22 further includes an elastic element 226 and a gasket 227, the valve core further includes a third step portion 228, the elastic element 226 and the gasket 227 are located in the first cavity 2211, the gasket 227 is located on the outer periphery of the collar 225, a gap is left between the inner periphery side of the gasket 227 and the outer periphery side of the collar 225, a gap is left between the outer periphery wall where the gasket 227 is arranged and the side wall where the valve core forms the first cavity along the radial direction of the first cavity 2211, a gap is left between the elastic element 226 and the side wall where the valve core forms the first cavity, one end of the elastic element 226 abuts against the third step portion 228, the other end of the elastic element 226 abuts against the lower end face of the gasket 227, the elastic element 226 is in an elastic compression deformation state, so that under the action of the elastic element 226, the upper end face of the gasket 227 can abut against the second gasket 2242 of the thrust bearing 224, the first gasket 2241 of the thrust bearing 224 can abut against the sleeve 223 and/or the first step portion 2221, through the arrangement of the elastic element 226, a certain pre-tightening force can be provided between the components of the valve core assembly 22, which is beneficial to compensating or reducing the limit play of the valve core 221 in the process of axial movement, so that the flow regulation tends to be 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 gasket 2242 of the thrust bearing.

It should be noted that: although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that modifications and equivalents may be made thereto, and all technical solutions and modifications that do not depart from the spirit and scope of the present application are intended to be covered by the claims of the present application.

Claims

1. The utility model provides a valve device, includes the case subassembly, the case subassembly includes lead screw and case, the lead screw can drive case is along axial motion, its characterized in that: the valve core assembly further comprises a sleeve, a sleeve ring and a thrust bearing, the sleeve ring is located on the periphery of the screw rod, and the sleeve ring is fixedly connected with the screw rod; the thrust bearing is located at the periphery of the screw rod, the sleeve is located at the 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 valve core moves upwards along the axial direction, the thrust bearing can be abutted to the sleeve, and when the valve core moves downwards along the axial direction, the thrust bearing can be abutted to the valve core.

2. The valve apparatus of claim 1, wherein: the sleeve is in clearance fit with the screw rod, the thrust bearing is in clearance fit with the screw rod, the valve core is provided with a first cavity, the lantern ring and the thrust bearing are located in the first cavity, at least part of the sleeve is located in the first cavity, and the outer side wall of the sleeve is welded and fixed with the side wall of the first cavity formed by the valve core.

3. The valve device according to claim 1 or 2, wherein: the thrust bearing comprises a first gasket, a second gasket and a rolling body, wherein the rolling body is located between the first gasket and the second gasket, the rolling body comprises a ball, the ball is respectively abutted against the first gasket and the second gasket, the ball can roll relative to the first gasket and/or the second gasket, and the first gasket and/or the second gasket can rotate relative to the rolling body.

4. A valve arrangement according to claim 3, wherein: the screw rod comprises a first step part, the valve core comprises a second step part, the thrust bearing is axially limited through the first step part and the sleeve ring, when the screw rod moves upwards along the axial direction, the sleeve ring is abutted to the second gasket, and the first gasket is abutted to the sleeve; when the screw rod moves downwards along the axial direction, the first step part is abutted with the first gasket, and the second gasket is abutted with the second step part.

5. The valve apparatus of claim 4, wherein: the valve core assembly further comprises an elastic element and a gasket, the valve core further comprises a third step part, the elastic element and the gasket are located in the first cavity, the gasket is located on the periphery of the lantern ring, one end of the elastic element is abutted to the gasket, the other end of the elastic element is abutted to the third step part, the elastic element is in an elastic compression deformation state, the gasket can be abutted to the second gasket under the action of the elastic element, and the first gasket can be abutted to the first step part and/or the sleeve.

6. The valve device according to any one of claims 2 to 4, wherein: along the radial direction of the first cavity, a gap is reserved between the outer peripheral wall of the lantern ring and the side wall of the first cavity formed by the valve core, and a gap is reserved between the thrust bearing and the side wall of the first cavity formed by the valve core.

7. The valve apparatus of claim 5, wherein: along the radial direction of the first cavity, a gap is reserved between the inner peripheral side of the gasket and the outer peripheral side of the sleeve ring, a gap is reserved between the outer peripheral wall of the gasket and the side wall of the first cavity formed by the valve core, a gap is reserved between the thrust bearing and the side wall of the first cavity formed by the valve core, and a gap is reserved between the elastic element and the side wall of the first cavity formed by the valve core.

8. The valve device according to claim 6 or 7, wherein: when the screw rod moves upwards along the axial direction, the lantern ring is abutted to the second gasket, the lantern ring and the second gasket rotate along with the circumferential direction of the screw rod, the ball rolls relative to the second gasket, and the second gasket rotates relative to the rolling body; when the screw rod moves downwards along the axial direction, the first step part is abutted to the first gasket, the first gasket rotates along with the circumferential direction of the screw rod, the ball rolls relative to the first gasket, and the first gasket rotates relative to the rolling body.

9. The valve apparatus of claim 8, wherein: the valve device further comprises a valve mouth, the valve mouth comprises an inclined section, the valve core further comprises a second cavity, at least part of the inclined section can be located in the second cavity, the inclined section and the side wall of the second cavity formed by the valve core are matched to form a throttling opening, the throttling opening is located at the matching position of the free tail end of the side wall forming the second cavity and the inclined section, the valve device further comprises a first channel and a second channel, the first channel and the second channel are located on different sides of the throttling opening, and the throttling opening can be communicated with the first channel and the second channel.