Electric valve

Abstract

The invention provides an electric valve which comprises a valve component, the valve component comprises a second sealing ring, the second sealing ring is provided with a valve port and is made of a plastic material, the valve component further comprises a valve element seat and a connecting piece, the valve element seat and the connecting piece are fixedly connected through welding, and the second sealing ring is limited between the valve element seat and the connecting piece in the axial direction. By means of the arrangement, the sealing performance and sealing durability of the valve port can be improved, and the second sealing ring can be installed through a relatively simple structure.

Description

[0001] (This application is a divisional application of Chinese Invention Patent Application No. 202011047068.7, filed on September 29, 2020, entitled "Electric Valve") TECHNICAL FIELD

[0002] The present application relates to an electric valve. BACKGROUND

[0003] In a vehicle thermal management system, an electric valve is often used as a throttling element. The electric valve can realize the throttling function through the forward flow or reverse flow of fluid according to the needs of the system. The electric valve usually adopts a hard sealing form of valve port to seal, but long-term use of the hard sealing mode may cause valve port wear, which may cause the valve port to be poorly sealed. SUMMARY

[0004] The purpose of the present application is to provide an electric valve that can improve the sealing performance and sealing durability of the valve port, and can install the second sealing ring through a relatively simple structure.

[0005] To achieve the above purpose, the present application adopts the following technical solutions:

[0006] An electric valve includes a valve component, the valve component includes a second sealing ring, the second sealing ring has a valve port, the second sealing ring is made of a plastic material, the valve component further includes a valve core seat and a connecting piece, the valve core seat and the connecting piece are fixedly connected by welding, and the second sealing ring is limited between the valve core seat and the connecting piece in the axial direction. The present application provides an electric valve, which includes a valve component, the valve component includes a second sealing ring, the second sealing ring has a valve port, the second sealing ring is made of a plastic material, the valve component further includes a valve core seat and a connecting piece, the valve core seat and the connecting piece are fixedly connected by welding, and the second sealing ring is limited between the valve core seat and the connecting piece in the axial direction. In this way, the sealing performance and sealing durability of the valve port can be improved, and the installation of the second sealing ring can be realized through a relatively simple structure. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a perspective structural schematic diagram of an embodiment of an electric valve;

[0008] Figure 2 is Figure 1 a cross-sectional structural schematic diagram of an electric valve in

[0009] Figure 3 is Figure 2 a cross-sectional structural schematic diagram of a valve component in

[0010] Figure 4 isFigure 3 A part of the enlarged structure schematic view of the middle A part;

[0011] Figure 5 is Figure 3 A perspective structure schematic view of the second support part in the middle;

[0012] Figure 6 is Figure 3 A perspective structure schematic view of the nut seat in the middle;

[0013] Figure 7 is Figure 3 A part of the enlarged structure schematic view of the middle B part. DETAILED DESCRIPTION

[0014] The application will be further described below in conjunction with the drawings and specific embodiments:

[0015] Referring to Figure 1 and Figure 2 , the electric valve can be applied to a vehicle thermal management system, wherein the vehicle thermal management system includes a new energy vehicle thermal management system. The electric valve 100 includes a control component 1, a valve component 2, and a valve body component 3, part of the valve component 2 is located in the valve body cavity 30 formed by the valve body component 3, the valve component 2 is connected with the valve body component 3, the control component 1 is located at the outer periphery of the valve component 2, the control component 1 is connected with the valve body component 3, and the electric valve 100 is electrically connected and / or signal connected with the outside through the control component 1.

[0016] Referring to Figure 1 and Figure 2 , the control component 1 includes an outer shell 11, a stator assembly 12, and an interface part 13, the stator assembly 12 includes a coil winding 121, and the interface part 13 includes a first pin 131. In this embodiment, the coil winding 121 and the first pin 131 are injection molded inserts, and the outer shell 11 is integrally injection molded. The interface part 13 is integrally injection molded with the outer shell 11. One end of the first pin 131 is electrically connected with the coil winding 121, and the other end of the first pin 131 is located in the plug-in cavity formed by the interface part 13, and is used for electrical connection with the outside.

[0017] Referring to Figure 3The valve component 2 comprises a rotor assembly 20, a screw rod 21, a support member 22, a transmission assembly 23, a valve core 24 and a fixed seat 25. The rotor assembly 20 comprises a rotor 201 and a fixed plate 202, and the fixed plate 202 can be an injection molded insert, and the rotor 201 is formed by injection molding, i.e. the fixed plate 202 is fixed with the rotor 201 by injection molding. The transmission assembly 23 comprises a nut seat 231, and the rotor assembly 20 is fixedly connected with one end of the screw rod 21, specifically, the rotor assembly 20 is fixedly connected with the screw rod 21 through the fixed plate 202, and the fixed plate 202 is located on the outer periphery of the screw rod 21, and the fixed plate 202 can be fixedly connected with the screw rod 21 by welding or interference fit. The other end of the screw rod 21 is threadedly connected with the nut seat 231, specifically, the outer surface of the end of the screw rod 21 connected with the nut seat 231 is provided with an external thread segment, the nut seat 231 has a first through hole 232, and the inner wall surface of the nut seat 231 forming the first through hole 232 is provided with an internal thread segment, the screw rod 21 extends into the first through hole 232, and the outer surface of the screw rod 21 threadedly cooperates with the inner wall surface of the nut seat 231 to realize the threaded connection between the screw rod 21 and the nut seat 231. The valve core 24 is connected with the nut seat 231, specifically, at least part of the nut seat 231 is located in an inner cavity 240 formed by the valve core 24, the valve core 24 comprises a second stepped portion 241, the valve component 2 further comprises a first gasket 26 and a bushing 27, the first gasket 26 is located in the inner cavity 240, one end surface of the first gasket 26 abuts against the second stepped portion 241, and the other end surface of the first gasket 26 can abut against the end surface of the nut seat 231 located in the inner cavity 240. The bushing 27 is located on the outer periphery of the nut seat 231, part of the bushing 27 is located in the inner cavity 240, and the bushing 27 is fixedly connected with the valve core 24, and in this embodiment, the bushing 27 is fixedly connected with the valve core 24 by welding, and of course, as other embodiments, the bushing 27 can also be fixedly connected with the valve core 24 by riveting or interference fit. The nut seat 231 comprises a fourth stepped portion 233, and the fourth stepped portion 233 can abut against the end surface of the bushing 27 located in the inner cavity 240. In this embodiment, the transmission assembly 23 further comprises an elastic element 234, the nut seat 231 further comprises a second through hole 235, the first through hole 232 and the second through hole 235 are communicated, a third stepped portion 236 is formed between the first through hole 232 and the second through hole 235, part of the elastic element 234 is located in the second through hole 235, the elastic element 234 abuts against the third stepped portion 236 and the first gasket 26 respectively, the elastic element 234 is in an elastic compression state, and the elastic element 234 is beneficial to buffering the nut seat 231 when the nut seat 231 drives the valve core 24 to move to a boundary position, alleviating the impact of the nut seat 231 with the first gasket 26 or the bushing 27, and prolonging the service life of the nut seat 231. It should be noted that the elastic element 234 can be a spring or other elastic element.Of course, as other embodiments, the valve member 2 can also not comprise the elastic element 234 and the first gasket 26, i.e. the nut seat 231 directly passes during the movement in abutment with the bushing 27 or with the second step 241, thus bringing the spool 24 into movement.

[0018] With reference to Figure 3 and Figure 4The support member 22 comprises a first support 221 and a second support 222. The first support 221 has a first accommodating cavity 223, and the second support 222 has a second accommodating cavity 224. At least part of the second support 222 is located in the first accommodating cavity 223. The first support 221 is fixedly connected with the second support 222. In this embodiment, the first support 221 is fixedly connected with the second support 222 by welding. The support member 22 further comprises a bearing 225 and a collar 226. Part of the lead screw 21 is located in the first accommodating cavity 223. The bearing 225 and the collar 226 are respectively located on the outer periphery of the lead screw 21. The bearing 225 and the collar 226 are located in the first accommodating cavity 223. The collar 226 is fixedly connected with the first support 221. Specifically, the collar 226 and the first support 221 can be fixedly connected by welding, interference assembly, riveting or the like. The first support 221 further comprises a first step portion 227. The bearing 225 is located between the collar 226 and the first step portion 227. The bearing 225 can abut against the collar 226 and / or the first step portion 227, that is, the bearing 225 is axially limited by the collar 226 and the first step portion 227. The lead screw 21 cooperates with the bearing 225. The lead screw 21 is axially limited by the bearing 225. Specifically, in this embodiment, the lead screw 21 comprises a protruding portion 211. The valve member 2 further comprises a sleeve 212. The sleeve 212 is located on the outer periphery of the lead screw 21. The sleeve 212 is fixedly connected with the lead screw 21, such as interference assembly or welding. The bearing 225 is located between the sleeve 212 and the protruding portion 211. The sleeve 212 and / or the protruding portion 211 can abut against the bearing 225. In this way, when the bearing 225 is axially limited, the lead screw 21 is also axially limited by the bearing 225. Part of the support member 22 is located in the rotor cavity 203 formed by the rotor assembly 20. Specifically, the bearing 225 is arranged in the rotor cavity 203 of the rotor assembly 20. This is advantageous in reducing the friction loss of the lead screw 21 during rotation. On the other hand, arranging the bearing 225 in the rotor cavity 203 is advantageous in reducing the swing of the lead screw 21 during rotation, so as to stabilize the operation of the lead screw 21. Specifically, since the rotor assembly 20 is fixedly connected with one end of the lead screw 21 through the fixing plate 202, and the nut seat 231 is threadedly connected with the other end of the lead screw 21, along the axial direction of the lead screw 21, the distance L1 from the upper end face of the bearing 225 to the lower end face of the fixing plate 202 can be equal to or tend to be equal to the distance L2 from the lower end face of the bearing 225 to the upper end point of the outer threaded segment of the lead screw. This is advantageous in better reducing the swing of the lead screw 21 during rotation, so as to stabilize the operation of the lead screw 21, and further stabilize the operation of the electric valve 100. The end face of the bearing 225 close to the collar 226 is defined as the upper end face. The end face of the bearing 225 close to the first step portion 227 is defined as the lower end face. The end face of the fixing plate 202 close to the bearing 225 is defined as the lower end face. The end point of the outer threaded segment of the lead screw close to the bearing 225 is defined as the upper end point.

[0019] Referring toFigure 3 、 Figure 5 and Figure 6 , the second support member 222 forms the inner wall of the second accommodating cavity 224, and a limiting portion 228 is arranged on the inner wall of the second accommodating cavity 224, the limiting portion 228 is a non-rotating body, and correspondingly, the outer side wall of the nut seat 231 is provided with a matching portion 237, part of the nut seat 231 is located in the second accommodating cavity 224, and the limiting portion 228 and the matching portion 237 are matched with each other to prevent the nut seat 231 from rotating circumferentially during movement. Specifically, the structure of the limiting portion 228 can be various, as long as it can prevent the nut seat 231 from rotating circumferentially. In the embodiment, the limiting portion 228 includes limiting portion side surfaces 229, the number of the limiting portion side surfaces 229 is four and they are symmetrically distributed, and correspondingly, the matching portion 237 includes matching portion side surfaces 239, the number of the matching portion side surfaces 239 is four and they are symmetrically distributed. When the nut seat 231 is located in the second accommodating cavity 224, the limiting portion side surfaces 229 are arranged in abutment with the matching portion side surfaces 239 to prevent the nut seat 231 from rotating circumferentially. On the other hand, by arranging the limiting portion side surfaces 229 in abutment with the matching portion side surfaces 239, the second support member 222 can guide the axial movement of the nut seat 231.

[0020] Referring to Figure 2 and Figure 3 , the support member 22 is fixedly connected with the fixed seat 25. Specifically, in the embodiment, the support member 22 is welded and fixed with the fixed seat 25 through the first support member 221. The valve component 2 further includes a sleeve 28, which is located at the outer periphery of the rotor assembly 20 and is fixedly connected with the support member 22. Specifically, the sleeve 28 can be fixed with the first support member 221 by welding. The sleeve 28 is arranged to separate the stator assembly 12 and the rotor assembly 20, which is conducive to preventing the working medium located at the rotor assembly 20 from contacting the stator assembly 12 and causing corrosion or failure of the stator assembly 12.

[0021] Referring to Figure 3, the valve component 2 further comprises a first sealing assembly 29, the first sealing assembly 29 comprises a first sealing member 291 and a first sealing ring 292, the first sealing ring 292 can be integrally injection molded, in the embodiment, the first sealing ring 292 is made of polytetrafluoroethylene (PTFE), of course, as other embodiments, the first sealing ring 292 can also be made of a mixture of polytetrafluoroethylene and other materials or other plastic materials with hardness and elasticity. The fixed seat 25 has a first mounting cavity 251, part of the valve core 24 is located in the first mounting cavity 251, the first sealing ring 292 is located on the outer periphery of the valve core 24, the first sealing ring 292 is interference fit with the valve core 24, so that the first sealing ring 292 is in close contact with the outer peripheral wall of the valve core 24, and the valve core 24 is sealed, the first sealing ring 292 comprises a first recess portion 293, part of the first sealing member 291 is located in the first groove cavity formed by the first recess portion 293, the first sealing member 291 is compressed between the first recess portion 293 and the inner side wall of the first mounting cavity 251 formed by the fixed seat 25, and the first sealing member 291 is in a sealed and compressed state. Further, to prevent the first sealing assembly 29 from moving axially with the valve core 24 and ensure the sealing performance of the first sealing assembly 29, the fixed seat 25 further comprises a fifth stepped portion 252, and the first sealing assembly 29 further comprises a first retaining ring 294, the first retaining ring 294 is located on the outer periphery of the valve core 24 and is fixedly connected with the fixed seat 25, specifically, the first retaining ring 294 and the fixed seat 25 can be fixedly connected by welding or interference fit, etc., the first sealing assembly 29 is located between the fifth stepped portion 252 and the first retaining ring 294, and the first sealing assembly 29 is axially limited by the fifth stepped portion 252 and the first retaining ring 294.

[0022] Referring to Figure 3 and Figure 7, the valve member 2 further comprises a valve core seat 4 and a second sealing assembly 5, the first sealing assembly 29 and the second sealing assembly 5 are located on two sides of the valve core seat 4 along the axial direction of the valve core 24. The second sealing assembly 5 comprises a second sealing ring 52 and a connecting piece 53, the material of the second sealing ring 52 can be the same as that of the first sealing ring 292, the valve core seat 4 is fixedly connected with the fixed seat 25, and the valve core seat 4 is fixedly connected with the connecting piece 53, that is, the valve core seat 4 connects the fixed seat 25 and the connecting piece 53. Specifically, the valve core seat 4 and the fixed seat 25 and the valve core seat 4 and the connecting piece 53 can be fixedly connected by welding. The connecting piece 53 comprises a second groove part 531, the second sealing ring 52 is press-fitted into the cavity formed in the connecting piece 53, and the second sealing ring 52 and the connecting piece 53 can be fixed by interference fit, part of the second sealing ring 51 is located in the second groove part 531, and the second sealing ring 51 is tightly pressed between the end face of the second sealing ring 52 and the second groove part 531. The second sealing ring 51 is in a sealed and tightly pressed state. Further, the valve core seat 4 can further comprise a flange part 41, the flange part 41 is arranged to axially limit the second sealing ring 51.

[0023] Referring to Figure 3 and Figure 7 , the valve member 2 has a valve core cavity 40, the valve core 24 is located in the valve core cavity 40, and the valve core 24 can reciprocate in the valve core cavity 40 along the axial direction and is limited in movement by the second support 222 and the second sealing ring 52. In the embodiment, the valve core cavity 40 can be formed by the fixed seat 25, the valve core seat 4 and the second sealing assembly 5. The second sealing ring 52 comprises a valve port 521, the rotor assembly 20 can drive the valve core 24 to approach or move away from the valve port 521, so as to change the flow passage cross-sectional area of the working medium at the valve port 521, form throttling at the valve port 521, and set the second sealing ring 52 (plastic part) to form the valve port 521, so that the valve core 24 and the valve port 521 can form better sealing effect when abutting, which is beneficial to improve the internal leakage, and the electric valve 100 can be applied to a working environment with a larger pressure range. In the embodiment, the valve core 24 further comprises an inclined section 242 matched with the valve port 521, the cross-sectional width D of the inclined section 242 gradually decreases from top to bottom along the axial direction of the valve core 24, and the free end of the valve core 24 has the smallest cross-sectional width. The inclined section 242 can form linear throttling with the valve port 521 when the valve core 24 approaches or moves away from the valve port 521, which is beneficial to improve the flow control accuracy of the electric valve 100. It should be noted that the axial height H of the inclined section 242 can be set to adjust the interval width of the linear throttling, and the inclination degree of the inclined section 242 can be set to adjust the flow rate change rate of the linear throttling. Specifically, a plane parallel to the central axis of the valve member 2 can be defined, as shown in Figure 7The projection of the outer side wall of the inclined section 242 on the plane of the cross section forms an angle θ with the projection of the outer side wall of the vertical section of the valve core 24 on the plane. The angle θ can be used to set the inclination of the inclined section 242. In general, the angle θ can be set to be in the range of 1° to 3°.

[0024] Referring to Figure 2 , the valve body component 3 includes a first flow passage 31 and a second flow passage 32, which are respectively connected to the valve body cavity 30 in which the valve component 2 is located. The first flow passage 31 and the second flow passage 32 can be connected through the valve port 521. The valve component 2 is connected to the valve body component 3. Specifically, the valve component 2 and the valve body component 3 can be connected by threaded connection, welding, or compression nut compression, etc. In this embodiment, the valve component 2 is connected to the valve body component 3 by the fixing seat 25. Further, the valve component 2 and the valve body component 3 can be sealed to prevent leakage of the working medium from the assembly gap between the valve component 2 and the valve body component 3.

[0025] Referring to Figure 2 and Figure 3 , the working principle of the electric valve 100 is as follows: after the control component 1 is powered on, the control component 1 can generate an excitation magnetic field through the stator assembly 12. The rotor assembly 20 can drive the lead screw 21 to rotate under the excitation of the magnetic field of the stator assembly 12. The lead screw 21 is threadedly connected to the nut seat 231 and is axially limited by the bearing 225. The nut seat 231 is circumferentially limited by the second support 222. Thus, under the action of the thread, the lead screw 21 rotates circumferentially without axial movement. Under the guidance of the second support 222, the nut seat 231 moves axially without circumferential rotation. The nut seat 231 is connected to the valve core 24, and the axial movement of the nut seat 231 drives the axial movement of the valve core 24. Thus, the valve core 24 can move close to or away from the valve port 521 to realize the connection, closing, or throttling of the first flow passage 31 and the second flow passage 32.

[0026] Referring to Figure 2 , during the operation of the electric valve 100, when the first flow passage 31 is used as the fluid inlet, the second flow passage 32 is used as the fluid outlet, and the flow direction of the fluid is defined as forward flow. After the high-pressure fluid flows into the first flow passage 31, it enters the valve core cavity 40 through the communication holes 42 of the valve core seat 4. The number of the communication holes 42 is at least one, and in this embodiment, the number of the communication holes 42 is multiple and symmetrically distributed, which is beneficial to balance the impact of the high-pressure fluid flowing from the first flow passage 31 on the valve core 42. The axial movement of the valve core 24 relative to the valve port 521 can form a throttle at the valve port 521. The high-pressure fluid in the valve core cavity 40 becomes low-pressure fluid after throttling at the valve port 521 and flows out of the second flow passage 32 to the subsequent circuit.

[0027] Referring to Figure 2 and Figure 3 When the second flow channel 32 is the fluid inlet, at this time the first flow channel 31 is the fluid outlet, the flow direction of the fluid at this time is defined as reverse flow, when the high-pressure fluid flows into the second flow channel 32, the high-pressure fluid will act on the free end face of the valve core 24, and an upward force will be generated on the valve core 24. In order to eliminate or slow down the pressure effect of the high-pressure fluid on the valve core 24, and to make the valve core 24 move smoothly, the electric valve 100 further comprises a balance channel. Specifically, in the embodiment, the nut seat 231 further comprises a balance hole 238, the number of the balance hole 238 is at least one, the balance hole 238 is communicated with the valve core cavity 40 and the first through hole 232 of the nut seat 231, the inner cavity 240 of the valve core 24 is communicated with the valve body cavity 30 and the second through hole 235 of the nut seat 231, and the second through hole 235 is further communicated with the first through hole 232. In this way, the high-pressure fluid can flow into the inner cavity 240 of the valve core 24, flow through the second through hole 235 and the first through hole 232 of the nut seat 231, and then flow out of the balance hole 238, flow into the valve core cavity 40 on the back pressure side of the valve core 24, and be sealed by the first sealing assembly 29. The high-pressure fluid on the back pressure side of the valve core 24 will generate a downward force on the valve core 24. In this way, the valve core 24 is subjected to the pressure of the high-pressure fluid in opposite directions, which is beneficial to balance or tend to balance the force on the valve core 24, and further beneficial to the smooth movement of the valve core 24. The axial movement of the valve core 24 relative to the valve port 521 can form throttling at the valve port 521. After the fluid flows into the second flow channel 32, it becomes low-pressure fluid after throttling at the valve port 521, and then flows out of the first flow channel 31 after flowing through the communication hole 42, and then flows to the subsequent circuit. The balance hole 238 is beneficial to quickly balance or tend to balance the pressure of the high-pressure fluid on the valve core 24. Of course, other embodiments can not include the balance hole 238 in the nut seat 231, that is, the high-pressure fluid can enter the valve core cavity 40 on the back pressure side of the valve core 24 through the gap between the nut seat 231 and the screw rod 21, and also can balance or tend to balance the force on the valve core 24. Of course, it is easy to think that the high-pressure fluid entering the inner cavity 240 can also enter the valve core cavity 40 on the back pressure side of the valve core 24 through the gap between the valve core 24 and the nut seat 231.

[0028] It should be noted that the above embodiments are only used to illustrate the technical solutions described in the present application and not to limit the technical solutions described in the present application. For example, the directions such as "front", "rear", "left", "right", "up", "down" and the like are defined. Although the present application has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that the technical personnel in the technical field can still modify or equivalently replace the present application. All technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. An electric valve, characterized in that, The device includes a valve component, which includes a second sealing ring having a valve port. The second sealing ring is made of plastic material. The valve component also includes a valve core seat and a connector. The valve core seat and the connector are fixedly connected by welding. Along the axial direction, the second sealing ring is confined between the valve core seat and the connector.

2. The electric valve according to claim 1, characterized in that, An installation cavity is formed between the valve core seat and the connector, and a portion of the second sealing ring is located in the installation cavity. The valve core seat and the connector clamp the second sealing ring. The second sealing ring is made of polytetrafluoroethylene.

3. The electric valve according to claim 1 or 2, characterized in that, The valve component further includes a second seal located between the second sealing ring and the connector.

4. The electric valve according to claim 3, characterized in that, The connector includes a second groove, and the second seal is located in a second cavity formed by the second groove. The second seal is pressed between the second groove and the second sealing ring.

5. The electric valve according to claim 3 or 4, characterized in that, The valve core seat also includes a flange portion, the outer side of which has a chamfer. The flange portion abuts against a portion of the upper end face of the second sealing ring. The connector also includes a first limiting step, and the valve core seat abuts against or is clearance-fitted with the first limiting step.

6. The electric valve according to any one of claims 1-5, characterized in that, The connector includes a first mating step, and the valve core seat abuts against the first mating step.

7. The electric valve according to claim 6, characterized in that, The valve core seat includes a second mating step, and the first mating step and the second mating step are mated together.

8. The electric valve according to any one of claims 1-7, characterized in that, The valve component also includes a valve core assembly having a balancing channel.

9. The electric valve according to claim 8, characterized in that, The valve core assembly includes a valve core having an inclined section and a valve port having a rounded corner, the inclined section cooperating with the valve port.

10. The electric valve according to claim 8 or 9, characterized in that, The electric valve also includes a valve body component, which is fixed to the valve body component by threaded connection, welding, or by a compression nut. It also includes a first seal and a second seal, with the first seal disposed between the connector and the valve body component, and the second seal disposed between the fixing seat of the valve component and the valve body component.

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