An electrically operated valve

Abstract

The utility model discloses an electric valve, including output gear, valve rod, permanent magnet and hall sensor, set the hole portion in output gear, valve rod is located at least partly in the hole portion and is transmission connection with output gear, sets up permanent magnet on the one end of valve rod near the circuit board, and the hall sensor is arranged on the side of circuit board near valve rod, so that the distance between permanent magnet and hall sensor is closer, and permanent magnet is fixed with valve rod instead of output gear, can directly detect the angle of valve rod rotation, reduces the detection error because of the clearance between output gear and valve rod, improves control accuracy.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric valve. BACKGROUND

[0002] The electric valve comprises a control device, a valve rod and a valve core, the control device comprises a control part, a driving part and a transmission component, the control part controls the driving part to operate, the driving part drives the valve core of the electric valve to move through the transmission component to achieve the purpose of switching or interrupting the fluid, in order to improve the control precision of the control device, a detection component is usually arranged on the control device, how to arrange the detection component on the electric valve to ensure the control precision of the control device is a technical problem. SUMMARY

[0003] The present application aims to provide an electric valve which is beneficial to ensure the control precision of the electric valve.

[0004] In order to achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] An electric valve, comprising a control device, a valve rod and a valve core, the control device comprises a circuit board, a driving part and a transmission component, the circuit board is electrically connected or signal connected with the driving part, the driving part is transmission connected with the transmission component, the transmission component is transmission connected with the valve rod, the valve rod is connected with the valve core, the transmission component drives the valve rod to rotate, the valve rod drives the valve core to move, the control device further comprises a detection component, the detection component comprises a permanent magnet and a Hall sensor, the transmission component comprises an output gear, the output gear has a hole part, the hole part is arranged in the axial direction, the valve rod is at least partially located in the hole part and is transmission connected with the output gear, the permanent magnet is fixedly connected with the valve rod through a connecting piece and the permanent magnet is located at one end of the valve rod close to the circuit board, the Hall sensor is located above the permanent magnet, the Hall sensor is arranged on one side of the circuit board close to the valve rod, and the Hall sensor is electrically connected or signal connected with the circuit board.

[0006] The hole part is arranged in the output gear, the valve rod is at least partially located in the hole part and is transmission connected with the output gear, the permanent magnet is arranged at one end of the valve rod close to the circuit board, the permanent magnet is fixedly connected with the valve rod through the connecting piece, and the Hall sensor is arranged on one side of the circuit board close to the valve rod, so that the distance between the permanent magnet and the Hall sensor is relatively short, and the permanent magnet is fixed with the valve rod instead of the output gear, which can directly detect the rotating angle of the valve rod, reduces the detection error caused by the gap between the output gear and the valve rod, and improves the control precision. BRIEF DESCRIPTION OF DRAWINGS

[0007] Figure 1 is a perspective structural schematic view of one angle of the first embodiment of the electric valve;

[0008] Figure 2 is Figure 1 a top view of the electric valve shown in FIG. 1;

[0009] Figure 3 is Figure 2 a sectional view along the direction of B-B;

[0010] Figure 4 is Figure 2 a sectional view along the direction of A-A;

[0011] Figure 5 is Figure 1 a perspective view of one angle of the transmission component and the driving part of the electric valve shown in FIG. 1;

[0012] Figure 6 is Figure 1 a perspective view of one angle of the transmission component and the rotor assembly of the electric valve shown in FIG. 1;

[0013] Figure 7 isa perspective view of one angle of the speed reduction gear mechanism and the rotor assembly;

[0014] Figure 8 isa perspective view of another angle of the speed reduction gear mechanism and the rotor assembly;

[0015] Figure 9 is an exploded view of the output gear, the limiting frame and the valve rod;

[0016] Figure 10 is a sectional view of the combination of the output gear, the limiting frame and the valve rod;

[0017] Figure 11 is a perspective view of one angle of the first embodiment of the connection of the valve rod and the permanent magnet;

[0018] Figure 12 is a top view of the electric valve shown in FIG. 1; Figure 11

[0019] Figure 13 is a sectional view along the direction of A-A; Figure 12

[0020] is a perspective view of another angle of the first embodiment of the connection of the valve rod and the permanent magnet; Figure 14

[0021] is a perspective view of one angle of the second embodiment of the connection of the valve rod and the permanent magnet; Figure 15

[0022] Figure 16is Figure 15 a cross-sectional structural schematic diagram of the structure shown in Fig. 1;

[0023] Figure 17 is a cross-sectional structural schematic diagram of the third embodiment in which the valve stem is connected with the permanent magnet. DETAILED DESCRIPTION

[0024] The application will be further described below in conjunction with the drawings and specific embodiments:

[0025] Referring to Figures 1-10 For the first embodiment of the electric valve of the application, the electric valve can be applied to the thermal management system of a vehicle, and the electric valve includes an electric ball valve and an electronic expansion valve, etc. In this embodiment, the electric valve is specifically an electric ball valve. The electric ball valve 100 includes a control device 2, a valve core, a valve stem 5, and a valve body assembly 4. The valve core in this embodiment is specifically a valve core ball 3. When the electric valve is an electronic expansion valve, the valve core can also be a needle. The valve body assembly 4 includes a valve body 41, and the valve core ball 3 is located in a valve body cavity 411 formed by the valve body 41. The control device 2 includes a driving part 21, a transmission part 22, and a control part 23. The driving part 21 includes a rotor assembly 211 and a stator assembly 212. The rotor assembly 211 is located at the inner periphery of the stator assembly 212. Of course, the rotor assembly can also be located at the outer periphery of the stator assembly. The control part 23 includes a circuit board 231, which is electrically and / or signal connected with the stator assembly 212. The rotor assembly 211 is in transmission connection with the transmission part 22. The transmission part 22 can be a gear reduction mechanism. Of course, it can also be other forms of transmission reduction mechanism. The transmission part 22 is in transmission connection with the valve stem 5. The valve stem 5 is connected with the valve core ball 3, and the valve stem 5 can drive the valve core ball 3 to rotate. The valve core ball 3 is provided with an inner passage 31. The valve body 4 is provided with at least two flow-through passages 412, 413 for communicating with the outside. The circuit board 231 controls the stator assembly 212 to generate an excitation magnetic field. Under the action of the excitation magnetic field, the rotor assembly 211 outputs a rotation torque, which is transmitted to the valve stem 5 through the transmission part 22. The valve stem 5 drives the valve core ball 3 to rotate, so that the inner passage 31 of the valve core ball is in communication or not in communication with the flow-through passages 412, 413 or selectively in communication or not in communication with one of the flow-through passages 412, 413, thereby opening or closing or switching the flow-through path of the electric ball valve or controlling the flow of the flow-through path.

[0026] The control device 2 further includes a housing 24, which includes an upper cover 241 and a lower housing 242. The upper cover 241 is fixedly connected with the lower housing 242. The driving part 21, the control part 23, at least part of the transmission part 22, and at least part of the valve stem 5 are located in the housing 24.

[0027] Referring to Figures 5-8The transmission component 22 comprises a gear reduction mechanism 221 in the embodiment. A five-stage transmission gear reduction mechanism is described in the embodiment. The gear reduction mechanism is not limited to a five-stage transmission gear reduction mechanism. For example, the gear reduction mechanism can be a three-stage transmission gear reduction mechanism. The five-stage transmission gear reduction mechanism comprises a first gear set, a second gear set, a third gear set, a fourth gear set, and a fifth gear set. The first gear set comprises a first gear 2221 and a second gear 2222. The second gear set comprises a third gear 2223 and a fourth gear 2224. The third gear set comprises a fifth gear 2225 and a sixth gear 2226. The fourth gear set comprises a seventh gear 2227 and an eighth gear 2228. The fifth gear set comprises a ninth gear 2229 and an output gear 2220. The first gear 2221 is fixedly connected or integrally injection molded with the rotor assembly 211. The second gear 2222 and the third gear 2223 are integrally injection molded. The fourth gear 2224 and the fifth gear 2225 are integrally injection molded. The sixth gear 2226 and the seventh gear 2227 are integrally injection molded. The eighth gear 2228 and the ninth gear 2229 are integrally injection molded. The transmission component 22 further comprises a first gear shaft 222, a second gear shaft 223, a third gear shaft 224, and a fourth gear shaft 225. The second gear 2222 and the third gear 2223 are arranged on the radial outer periphery of the first gear shaft 222. The fourth gear 2224 and the fifth gear 2225 are arranged on the radial outer periphery of the second gear shaft 223. The sixth gear 2226 and the seventh gear 2227 are arranged on the radial outer periphery of the third gear shaft 224. The eighth gear 2228 and the ninth gear 2229 are arranged on the radial outer periphery of the fourth gear shaft 225. Of course, as another embodiment, the second gear 2222 and the third gear 2223 can be separately processed and formed. The fourth gear 2224 and the fifth gear 2225, the sixth gear 2226 and the seventh gear 2227, and the eighth gear 2228 and the ninth gear 2229 can also be separately processed and formed. The control device 2 further comprises a partition plate 25 located below the circuit board 231. One end of each of the first gear shaft 222, the second gear shaft 223, the third gear shaft 224, and the fourth gear shaft 225 is fixedly connected or integrally injection molded with the lower housing 242 of the control device. The other end of each of the second gear shaft 223, the third gear shaft 224, and the fourth gear shaft 225 is fixedly connected with the partition plate 25. The partition plate 25 provides support for the gear shafts, thereby limiting the fourth gear to the ninth gear. The second gear 2222 and the third gear 2223 are jointly limited by the lower housing 242 and the driving portion 21 located above the second gear and the third gear. The lower housing 242 has a first through hole 2421. The output gear 2220 is at least partially located in the first through hole 2421. The lower end of the output gear 2220 can extend out of the first through hole 2421 or not extend out of the first through hole 2421. The partition plate 25 has a second through hole 251. The upper end of the output gear 2220 can pass through the second through hole 251, so that the output gear 2220 is supported on the partition plate 25.The output gear 2220 is connected with the valve stem 5, and the valve stem 5 is connected with the valve core ball 3. Of course, the output gear 2220 can also not pass through the second through hole 251, and support is provided by being connected with the valve stem 5.

[0028] The first gear 2221 is meshingly connected with the second gear 2222, the third gear 2223 is meshingly connected with the fourth gear 2224, the fifth gear 2225 is meshingly connected with the sixth gear 2226, the seventh gear 2227 is meshingly connected with the eighth gear 2228, and the ninth gear 2229 is meshingly connected with the output gear 2220. Under the action of the excitation magnetic field of the stator assembly 212, the rotor assembly 211 drives the first gear 2221 to rotate, the first gear 2221 is meshingly connected with the second gear 2222, that is, the first gear 2221 drives the second gear 2222 to rotate, the second gear 2222 is integrally injection molded with the third gear 2223 and is sleeved on the radial outer periphery of the same gear shaft (the first gear shaft 222), that is, the second gear 2222 rotates at the same angular velocity as the third gear 2223, the third gear 2223 is meshingly connected with the fourth gear 2224, that is, the third gear 2223 drives the fourth gear 2224 to rotate, and the fourth gear 2224 rotates at the same angular velocity as the fifth gear 2225, the fifth gear 2225 drives the sixth gear 2226 to rotate, the sixth gear 2226 rotates at the same angular velocity as the seventh gear 2227, the seventh gear 2227 drives the eighth gear 2228 to rotate, the eighth gear 2228 rotates at the same angular velocity as the ninth gear 2229, and the ninth gear 2229 drives the output gear 2220 to rotate, the output gear 2220 drives the valve stem 5 to rotate, and the valve stem 5 drives the valve core ball 3 to rotate.

[0029] In the embodiment, the electric ball valve 100 further comprises a limiting frame 6, and the valve stem 5 is connected with the output gear 2220 through the limiting frame 6. Referring to Figure 9The output gear 2220 has a bore 2220a and a transmission output portion 2220b. The transmission output portion 2220b is used to output torque and is located at one end of the output gear 2220 near the valve body 41. The bore 2220a is axially arranged and extends through the entire output gear 2220 axially. The bore 2220a also extends through the transmission output portion 2220b. The inner wall of the bore 2220a at the transmission output portion 2220b has a star-shaped structure. The limit frame 6 has a mating portion 61 and a connecting hole 62. The connecting hole 62 extends through the limit frame 6 axially and is partially located in the mating portion 61. The shape of the connecting hole 62 matches the valve stem 5. The mating portion 61 protrudes and its outer wall also has a star-shaped structure. The transmission output portion 2220b is connected to the mating portion 61. The star-shaped structure helps to limit rotational slippage between the transmission output portion and the mating portion. Specifically, the transmission output part 2220b and the mating part 61 are in a clearance fit. The mating part 61 is at least partially located in the hole 2220a. The valve stem 5 passes through the connecting hole 62 of the limiting frame 6. The limiting frame 6 is sleeved on the radial outer periphery of the valve stem 5 through the connecting hole 62. The limiting frame 6 and the valve stem 5 are fixedly connected, that is, there is a clearance fit between the transmission component 22 and the valve stem 5. In this embodiment, the hole 2220a is a through hole. In other embodiments, the hole 2220a may not be a through hole. The end of the hole 2220a near the circuit board may be closed.

[0030] The limiting bracket also includes a stop portion 63, which includes a stop section 631. The stop portion 63 can limit the rotation angle of the valve stem 5 through the stop section 631. The valve body assembly also includes a limiting post 42, which is integrally formed or fixedly connected to the valve body 41. During the rotation of the limiting bracket 6, the stop section 631 of the stop portion can abut against the limiting post 42 of the valve body assembly, thereby limiting the rotation angle of the limiting bracket 6, and thus limiting the rotation angle of the valve stem 5.

[0031] Valve stem 5 includes a first part 51, a second part 52, and a third part 53, which are attached to the valve stem. Figure 3 , 4 Viewed from angle 10, the first part 51 is located at the upper end of the valve stem 5, the third part 53 is located at the lower end of the valve stem 5, and the second part 52 is located between the first part 51 and the third part 53. The upper surface of the first part 51 is positioned close to the circuit board 231, the second part 52 is located within the connecting hole 62 of the limiting frame 6, and the second part 52 is fixedly connected to the limiting frame 6. The third part 53 is fixedly connected to the valve core ball 3. In this embodiment, both the first part 51 and the second part 52 are located within the hole 2220a of the output gear; however, the first part may also protrude from the hole.

[0032] The control device 2 is also equipped with a detection component for detecting the rotation angle of the valve stem. The detection component includes a permanent magnet 26 and a Hall sensor 27. The permanent magnet 26 can be made of sintered neodymium iron boron, or other materials such as ferrite. The permanent magnet 26 has at least two different magnetic poles; for example, it may include one N pole and one S pole. The permanent magnet 26 is fixedly connected to the valve stem 5 and can rotate with the valve stem 5. The Hall sensor 27 is located above the permanent magnet 26 and is mounted on the circuit board 231. The Hall sensor 27 can be electrically and signal-connected to the circuit board 231. To ensure the accuracy of the detection component and thus the control precision of the control device, since the circuit board 231 is located above the valve stem 5 and the transmission component 22, and the first part 51 of the valve stem 5 is adjacent to the circuit board 231, the permanent magnet 26 is fixedly connected to the first part 51 of the valve stem 5. The Hall sensor 27 is located on the side of the circuit board 231 near the valve stem 5. This places the Hall sensor 27 and the permanent magnet 26 relatively close together. Typically, the distance between the sensing surface of the Hall sensor and the upper surface of the permanent magnet is 2.5 to 3 mm. This allows the Hall sensor 27 to accurately detect the change in magnetic poles of the permanent magnet 26 as it rotates with the valve stem 5. The circuit board 231 then calculates the angle through which the permanent magnet 26 rotates with the valve stem 5. When the valve stem 5 is connected to the valve core ball 3, the circuit board 231 can also detect the angle through which the valve core ball 3 rotates with the valve stem 5, thus providing feedback on the position of the valve core ball and improving the control accuracy of the electric ball valve.

[0033] The permanent magnet 26 can be a magnetic ring or a magnetic disc structure. To ensure control accuracy and facilitate fixing with the valve stem, the permanent magnet 26 in this embodiment is a magnetic disc structure. Since the permanent magnet is a brittle material, directly fixing it to the valve stem 5 is technically difficult and may cause cracking. Therefore, the control device in this application also includes a connector 28, which is mainly made of plastic. The connector 28 is fixedly connected to the first part 51 of the valve stem and also fixedly connected to the permanent magnet 26. The permanent magnet 26 is fixedly connected to the first part 51 of the valve stem via the connector 28. In this embodiment, as... Figure 13 As shown, the connector 28 is generally inverted at 90° in an "I" shape. The connector 28 has a first recess 281 and a second recess 282. The first recess 281 is located above the second recess 282, and their openings face each other. The opening of the first recess 281 faces the location of the circuit board 231, while the opening of the second recess 282 faces the location of the valve stem 5. See details... Figure 11 , 12The inner wall of the first recess 281 has a plurality of protrusions 2811 arranged along the axial direction and evenly distributed on the inner wall of the first recess 281. The permanent magnet 26 is pressed into the first recess 281, and the permanent magnet 26 is in interference fit with the first recess 281 to fix the permanent magnet 26 to the connecting piece 28. Referring to Figure 14 The first part 51 of the valve stem also has a plurality of protrusions 511 arranged along the axial direction and evenly distributed on the outer peripheral wall of the first part 51. The first part 51 is riveted and pressed to the connecting piece 28, and the first part 51 is in interference fit with the connecting piece 28. The first part 51 is at least partially located in the second recess 282 of the connecting piece. In this embodiment, the connecting piece 28 and a part of the permanent magnet 26 are located in the hole portion 2220a of the output gear. The outer wall of the connecting piece 28 has a certain gap with the inner wall forming the hole portion 2220a, and the two do not contact each other. The wall forming the hole portion 2220a in the output gear has a certain limiting effect on the connecting piece 28 and the permanent magnet 26. Of course, it can be understood that the axial depth of the hole portion 2220a can be appropriately shortened, and the connecting piece 28 can be partially or entirely located outside the hole portion 2220a, which does not affect the detection accuracy of the electric ball valve.

[0034] Referring to 15 and 16, the second embodiment of the valve stem 5' and the permanent magnet 26' of the application is different from the connection mode shown in Figures 11-14 The permanent magnet 26' of this embodiment is integrally injection molded with the connecting piece 28'. The upper end surface of the injection molded permanent magnet 26' is wrapped and covered by the injection molded injection part, and part of it is exposed outside the injection molded injection part. This can not only achieve relatively reliable fixation with the connecting piece 28', but also ensure the magnetic field strength, thereby ensuring the detection accuracy.

[0035] Referring to Figures 11-14 The third embodiment of the valve stem 5" and the permanent magnet 26" of the application is different from the connection mode shown in Figure 17 Figures 11-14 The permanent magnet 26" of this embodiment is integrally injection molded with the connecting piece 28". The upper end surface of the permanent magnet 26" is not wrapped and covered by the injection molded injection part. The lower end of the permanent magnet 26" is provided with two or more protrusions 261". The shape of the protrusion 261" is not limited. The protrusion 261" can prevent the permanent magnet 26" from being pulled out of the connecting piece 28".

[0036] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. An electric valve comprising a control device, a valve stem and a valve core, the control device comprising a circuit board, a driving part and a transmission part, the circuit board being electrically or signal connected with the driving part, the driving part being transmission connected with the transmission part, the transmission part being transmission connected with the valve stem, the valve stem being connected with the valve core, the transmission part driving the valve stem to rotate, the valve stem driving the valve core to move, characterized in that: The control device further comprises a detection assembly, the detection assembly comprising a permanent magnet and a Hall sensor, the transmission component comprising an output gear, the output gear having a hole portion, the hole portion being arranged axially, the valve rod being at least partially located in the hole portion and being in transmission connection with the output gear, the permanent magnet being fixedly connected with the valve rod through a connecting piece and being located at an end of the valve rod close to the circuit board, the Hall sensor being located above the permanent magnet, the Hall sensor being arranged on a side of the circuit board close to the valve rod, the Hall sensor being in electrical connection or signal connection with the circuit board, the connecting piece being partially located in the hole portion, the output gear limiting the connecting piece and the permanent magnet in the radial direction. ​ 2. The motorized valve of claim 1, wherein: The valve rod has a first portion, the first portion being arranged close to the circuit board, the connecting piece being a plastic piece, the connecting piece being fixedly connected with the first portion of the valve rod, the connecting piece being fixedly connected with the permanent magnet.

3. The motorized valve of claim 2, wherein: The connecting piece has a first recess, the first recess being arranged with an opening facing the circuit board, an inner wall of the first recess having a convex rib, the convex rib being arranged axially, the convex rib being uniformly distributed along the inner wall of the first recess, the permanent magnet being at least partially located in the first recess and being in interference fit with the first recess.

4. The motorized valve of claim 2, wherein: The permanent magnet and the connecting piece are integrally injection molded, an upper end surface portion of the permanent magnet being exposed outside an injection molded portion formed by injection molding, the upper end surface portion of the permanent magnet being covered by the injection molded portion formed by injection molding.

5. The motorized valve of claim 2, wherein: The permanent magnet has a protrusion, the permanent magnet and the connecting piece being integrally injection molded, the protrusion being located at an end of the permanent magnet away from the circuit board, an end surface of the permanent magnet close to the circuit board being exposed outside the injection molded portion formed by injection molding.

6. An electrically powered valve according to any one of claims 3 to 5 wherein: The connecting piece has a second recess, the second recess being arranged with an opening facing the first portion, the first portion having a convex rib, the convex rib being arranged axially, the convex rib being uniformly distributed along the peripheral wall of the first portion, the first portion being at least partially located in the second recess and being in interference fit with the second recess.

7. The motorized valve of claim 2, wherein: The output gear has a transmission output portion, the electric valve further comprising a limiting frame, the limiting frame comprising a fitting portion and a connecting hole, the fitting portion being connected with the transmission output portion, the connecting hole being partially located in the fitting portion, the connecting hole penetrating through the limiting frame in the axial direction, part of the valve rod being located in the connecting hole, the limiting frame being fixedly connected with the valve rod through the connecting hole.

8. The motorized valve of claim 7, wherein: The valve rod further comprises a second portion and a third portion, the third portion being located at an end of the valve rod close to the valve core, the third portion being connected with the valve core, the second portion being located between the first portion and the third portion, the second portion being located in the connecting hole, the second portion being fixedly connected with the limiting frame.

9. The motorized valve of claim 2, wherein: The outer wall of the connecting piece and the inner wall of the hole portion formed by the output gear have a set gap.

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