Electric valve

Abstract

According to the electric valve, the gear reduction mechanism comprises a first gear ring, a second gear ring, an upper planetary gear assembly and a lower planetary gear assembly, the upper planetary gear assembly and the lower planetary gear assembly are arranged in the longitudinal direction of the electric valve, at least part of the first gear ring is located in an inner cavity of the rotor component, and an input gear part of the rotor component is meshed with a planetary gear of the upper planetary gear assembly; the lower planetary gear assembly is rotationally connected with the transmission rod. In the embodiment, at least part of the first gear ring is located in the inner cavity of the rotor component, and the size of the electric valve is reduced.

Description

[0001] This application is a divisional application of the Chinese invention patent filed on July 28, 2021, with application number 202110857831.0 and invention title "An Electric Valve". Technical Field

[0002] This invention relates to the field of fluid control technology, and more specifically to an electric valve. Background Technology

[0003] Figure 1 This is a partial cross-sectional schematic diagram of an electric valve provided as background information. For example... Figure 1 As shown, the electric valve includes a housing component 01, a rotor component 02, a gear assembly 03, and a transmission rod 04. The rotor component 02 and the gear assembly 03 are located inside the housing component 01. The gear assembly 03 includes a gear ring 031, a sun gear component 032, a planetary gear set 033, and an output gear set 034. Its operation is as follows: the rotation of the rotor component 02 drives the sun gear component 032 to rotate. The rotation of the sun gear component 032 drives the planetary gear set 033 to rotate, which in turn drives the output gear set 034 to rotate, which in turn drives the transmission rod 04 to rotate. This electric valve structure converts the small torque output from the rotor component 02 into a larger output torque through the gear assembly 03, thereby driving the transmission rod 04 to rotate and achieve the function of the electric valve. How to optimize the structure of the electric valve to achieve miniaturization is a problem that those skilled in the art need to consider. Summary of the Invention

[0004] The purpose of this invention is to provide an electric valve, including a control component, a valve body component, and a gear reduction mechanism. The control component includes a rotor component, the valve body component includes a transmission rod, and the gear reduction mechanism includes a first gear ring, a second gear ring, and an upper planetary gear assembly and a lower planetary gear assembly arranged longitudinally along the electric valve. At least a portion of the first gear ring is located within the inner cavity of the rotor component. The rotor component includes an input gear portion that meshes with the planetary gears of the upper planetary gear assembly. The planetary gears of the upper planetary gear assembly mesh with the first gear ring, and the planetary gears of the lower planetary gear assembly mesh with the second gear ring. The lower planetary gear assembly is rotatably connected to the transmission rod.

[0005] The electric valve provided by this invention includes a gear reduction mechanism comprising a first gear ring, a second gear ring, and an upper planetary gear assembly and a lower planetary gear assembly arranged longitudinally along the electric valve. At least a portion of the first gear ring is located within the inner cavity of the rotor component. The input gear portion of the rotor component meshes with the planetary gears of the upper planetary gear assembly, and the lower planetary gear assembly is rotatably connected to the transmission rod. In this embodiment, at least a portion of the first gear ring is located within the inner cavity of the rotor component, which helps to reduce the size of the electric valve. Attached Figure Description

[0006] Figure 1 Background Art provides a cross-sectional schematic diagram of an electric valve;

[0007] Figure 2 This invention provides a cross-sectional schematic diagram of an electric valve;

[0008] Figure 3 : Figure 2 A magnified view of a portion of the image;

[0009] Figure 4 : Figure 2 Schematic diagram of the structure of the second gear ring;

[0010] Figure 5a : Figure 2 A half-section perspective view of the first gear ring in the middle;

[0011] Figure 5b : Figure 5a Schematic diagram of the structure of the first gear ring;

[0012] Figure 6a : Figure 2 Three-dimensional output gear carrier Figure 1 ;

[0013] Figure 6b : Figure 2 Three-dimensional output gear carrier Figure 2 ;

[0014] Figure 7 : Figure 2 Schematic diagram of the structure of the second shell section;

[0015] Figure 8 : Figure 2 A schematic diagram showing the fit between the second housing, the first gear ring, and the output gear carrier;

[0016] Figure 2 : A cross-sectional view of another first gear ring provided by the present invention;

[0017] Figure 3 : Figure 2 Schematic diagram of the structure of the first gear ring;

[0018] Figure 4 : A schematic diagram of another output gear carrier provided by the present invention. Detailed Implementation

[0019] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0020] It should be noted that the directional terms such as "up" and "down" used in this article are in the context of... Figure 2 The directional terms used in this document, defined by their location in the diagram and their relative positions, are merely for clarity and convenience in illustrating the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0021] It should also be noted that the "circumferential rotation" mentioned in this article refers to movement in the circumferential direction, which includes both movements of more than one full rotation (360°) and movements of less than one full rotation (360°).

[0022] Figure 5a A cross-sectional schematic diagram of an electric valve provided by the present invention; Figure 2 for Figure 5b A magnified view of a portion of the image; Figure 5a for Figure 6a Schematic diagram of the structure of the first gear ring; Figure 2 for Figure 1 Half-section perspective view of the second gear ring; Figure 6b for Figure 2 Schematic diagram of the structure of the second gear ring; Figure 2 for Figure 7 Three-dimensional output gear carrier Figure 2 ; Figure 8 for Figure 2 Three-dimensional output gear carrier Figure 2 ; Figure 3 for Figure 2 Schematic diagram of the structure of the second shell section; Figure 2 for Figure 3 A schematic diagram showing the fit between the second housing, the second gear ring, and the output gear carrier.

[0023] like Figure 4 , Figure 2 As shown, the electric valve includes a control component 1, a gear reduction mechanism 2, a housing component 3, and a valve body component 4. The valve chamber of the electric valve includes an inner cavity 30 of the housing component and an inner cavity 40 of the valve body component. The valve body component 4 includes a transmission rod 41, a valve core 42, and a valve body 43.

[0024] The control component 1 includes a coil 11, a rotor component 12, a bearing component 13, a spring 14, a positioning seat 15, and a positioning rod 16. The coil 11 is located outside the housing component 3, while the rotor component 12, bearing component 13, spring 14, positioning seat 15, and positioning rod 16 are located inside the housing component 30. When the coil 11 is energized, it can drive the rotor component 12 to rotate circumferentially. The positioning seat 15 is located above the rotor component 12, and the upper end of the positioning rod 16 is located in the first blind hole 151 of the positioning seat 15, while the lower end of the positioning rod 16 is located in the second blind hole 410 of the transmission rod 41, thereby achieving the positioning of the positioning rod 16. The positioning rod 16 passes through the bearing component 13, the rotor component 12, and the first-stage planetary gear carrier 231, the second-stage planetary gear carrier 241, and the third-stage planetary gear carrier 251 of the gear reduction mechanism 2. The positioning of the positioning rod 16 ensures the coaxiality of the rotor component 12 and the gear reduction mechanism 2, improving the transmission reliability between the rotor component 12 and the gear reduction mechanism 2. Simultaneously, it also helps improve the operational stability of the gear reduction mechanism 2 and reduces the risk of jamming. Specifically, the rotor component 12 has a through hole 120, through which the positioning rod 16 passes, and the positioning rod 16 is clearance-fitted with the hole wall 1201 forming the through hole 120. The rotor component 12 includes a bracket 121 and a rotor 122 fixedly connected to the bracket 121. The rotor 122 is made by magnetic powder sintering, and the bracket 121 is fixedly connected to the rotor 122 by injection molding. The bracket 121 has the aforementioned through hole 120, and the bracket 121 includes a shaft portion 123. The lower section of the shaft portion 123 is integrally provided with an input gear portion 1211. The bearing component 13 is located between the positioning seat 15 and the bracket 121. A portion of the spring 14 is sleeved on the positioning seat 15, and another portion of the spring 14 is sleeved on the bearing component 13. One end of the spring 14 abuts against the positioning seat 15, and the other end of the spring 14 abuts against the bearing component 13. The bearing component 13 abuts against the bracket 121. By setting the spring 14, a spring force can be applied to the rotor component 12, preventing jamming caused by the axial movement of the rotor component 12 during the operation of the electric valve.

[0025] The gear reduction mechanism 2 is located within the inner cavity 30 of the housing component. The gear reduction mechanism 2 includes a first gear ring 21, a second gear ring 22, an upper planetary gear assembly 201, and a lower planetary gear assembly 202. The upper planetary gear assembly 201 includes a first-stage planetary gear set 23 and a second-stage planetary gear set 24. The lower planetary gear assembly 202 includes a third-stage planetary gear set 25 and a fourth-stage planetary gear set 26. The first-stage planetary gear set 23, the second-stage planetary gear set 24, the third-stage planetary gear set 25, and the fourth-stage planetary gear set 26 are arranged sequentially along the longitudinal direction of the electric valve.

[0026] Specifically, the first-stage planetary gear set 23 is located in the inner cavity 210 of the first gear ring, including a first-stage planetary gear carrier 231 and a first-stage planetary gear 232 mounted on the first-stage planetary gear carrier 231. The aforementioned input gear portion 1211 meshes with the first-stage planetary gear 232. The second-stage planetary gear set 24 includes a second-stage planetary gear carrier 241 and a second-stage planetary gear 242 mounted on the second-stage planetary gear carrier 241. Part of the second-stage planetary gear carrier 241 is located in the inner cavity 210 of the first gear ring, and another part is located in the inner cavity 220 of the second gear ring. The second-stage planetary gear 242 is located in the inner cavity 210 of the first gear ring, and the sun gear of the first-stage planetary gear carrier 231 meshes with the second-stage planetary gear 242. The planetary gears of the upper planetary gear assembly 201 include the first-stage planetary gear 232 and the second-stage planetary gear 242, and the first-stage planetary gear 232 and the second-stage planetary gear 242 have the same module. It should be noted that, with the number of teeth on a planetary gear remaining constant, the larger the module, the larger the radial dimension of the gear.

[0027] The third-stage planetary gear set 25 and the fourth-stage planetary gear set 26 are located in the inner cavity 220 of the second gear ring. The third-stage planetary gear set 25 includes a third-stage planetary carrier 251 and a third-stage planetary gear 252 mounted on the third-stage planetary carrier 251. The sun gear of the second-stage planetary carrier 241 meshes with the third-stage planetary gear 252. The fourth-stage planetary gear set 26 includes an output gear carrier 261 and a fourth-stage planetary gear 262 mounted on the column 263 of the output gear carrier 261. The sun gear of the third-stage planetary carrier 251 meshes with the fourth-stage planetary gear 262. In this embodiment, the planetary gears of the lower planetary gear assembly 202 include the third-stage planetary gear 252 and the fourth-stage planetary gear 262, and the third-stage planetary gear 252 and the fourth-stage planetary gear 262 have the same module. The module of the planetary gears of the upper planetary gear assembly 201 is smaller than the module of the planetary gears of the lower planetary gear assembly 202, that is, the module of the second-stage planetary gear 242 is smaller than the module of the third-stage planetary gear 252.

[0028] In this embodiment, the input gear 1211 of the rotor component 12 meshes with the first-stage planetary gear 232 of the upper planetary gear assembly 201. The first-stage planetary gear 232 then transmits torque to the second-stage planetary gear 242 through the first-stage planetary gear carrier 231. Since the planetary gears of the upper planetary gear assembly 201 are close to the rotor component 12 (torque input end), they bear a small load and have low strength requirements, so small-module (small-size) planetary gears can be used. The planetary gears of the lower planetary gear assembly 202 are close to the transmission rod 41 (torque output end), bear a large load and have high strength requirements, so large-module (large-size) planetary gears are required. Thus, setting the module of the planetary gears of the upper planetary gear assembly to be smaller than that of the planetary gears of the lower planetary gear assembly is beneficial to reducing the size of the planetary gears of the upper planetary gear assembly, which in turn reduces the lateral dimension of the electric valve, thereby reducing the volume of the electric valve.

[0029] The output gear carrier 261 includes a central hole 2610, the cross-sectional profile of which is non-circular. The upper end of the transmission rod 41 extends into the central hole 2610 to achieve a rotatable connection with the output gear carrier 261, and the output gear carrier 261 can drive the transmission rod 41 to rotate. The transmission rod 41 is rotatably connected to the valve core 42, and the transmission rod 41 can drive the valve core 42 to rotate to realize the opening, closing, or flow regulation functions of the electric valve.

[0030] In this embodiment, the inner wall of the first gear ring 21 is provided with a first internal tooth 214 extending longitudinally along the first gear ring 21. The first-stage planetary gear 232 and the second-stage planetary gear 242 both mesh with the first gear ring 21 through the first internal tooth 214. The inner wall of the second gear ring 22 is provided with an axially extending second internal tooth 2211. The third-stage planetary gear 252 and the fourth-stage planetary gear 262 both mesh with the second gear ring 22 through the second internal tooth 2211.

[0031] Because the first-stage planetary gear set 23 and the second-stage planetary gear set 24 of the upper planetary gear assembly 201 are close to the rotor component 12, the transmission torque is small and the strength requirement is low. Similarly, the first gear ring 21 that mates with the first-stage planetary gear set 23 and the second-stage planetary gear set 24 has a low strength requirement. Therefore, the first-stage planetary gear carrier 231, the first-stage planetary gear 232, the second-stage planetary gear carrier 241, and the second-stage planetary gear 242 can be made of plastic, specifically injection molded from materials such as nylon, PPS, and PEEK.

[0032] The housing component 3 includes a first housing part 31, a second housing part 32, and a coil mounting bracket 33. The first housing part 31 and the second housing part 32 are respectively made of stainless steel sheet or tubing. The first housing part 31 and the second housing part 32 are fixed by welding. The first housing part 31 is fixed by welding to the coil mounting bracket 33, and the second housing part 32 is fixed by welding to the valve body 43. Specifically, the rotor component 12 is located in the inner cavity 310 of the first housing part, and the coil 11 is sleeved on the first housing part 31 and fixed to the coil mounting bracket 33. The first housing part 31 includes a constant diameter section 311 and an expanded diameter section 312. The wall thickness of the constant diameter section 311 is smaller than the wall thickness of the second housing part 32. The rotor component 12 is located inside the constant diameter section 311, and the aforementioned coil 11 is sleeved on the constant diameter section 311. The upper section of the second housing part 32 is provided with an outer stepped part 321. The expanded diameter section 312 is placed on the outer stepped part 321, and the lower end of the expanded diameter section 312 is welded to the outer stepped part 321. The advantage of providing an outer stepped portion is that it makes it easier to position the first housing portion 31 and the second housing portion 32 during welding, thereby improving the welding quality.

[0033] The wall thickness of the equal diameter section 311 is less than that of the second housing part 32. The beneficial effect is that the thinner wall thickness of the equal diameter section 311 is conducive to increasing the magnetic flux, improving the driving efficiency of the coil 11, and reducing energy consumption; the thicker wall thickness of the second housing part 32 is conducive to increasing the pressure resistance and improving the service life, and it is not easily damaged even when subjected to strong refrigerant impact.

[0034] Furthermore, such as Figure 5a As shown, the lower section of the second housing portion 32 includes a reduced diameter portion 322, which is cylindrical. The valve body 43 of the valve body component 4 includes a protrusion 431 protruding towards the control component 1, which is also cylindrical. The reduced diameter portion 322 is at least partially located within the cavity of the protrusion 431, and the reduced diameter portion 322 is welded to the protrusion 431. It is conceivable that the protrusion 431 may also be at least partially located within the cavity of the reduced diameter portion 322.

[0035] Furthermore, such as Figure 8 , Figure 2 , Figure 5aAs shown, in this embodiment, the first gear ring 21 is generally cylindrical and made of plastic, specifically injection molded from materials such as nylon, PPS, and PEEK. The first gear ring 21 is located within the inner cavity 310 of the first housing portion, and at least partially within the inner cavity of the rotor component 12, positioned above the second gear ring 22. The first gear ring 21 includes a support portion 211, a positioning portion 212, and a locking portion 213. The support portion 211 is located above the positioning portion 212, and the positioning portion 212 is located above the locking portion 213. The outer diameter of the positioning portion 212 is larger than the outer diameter of the support portion 211, and the outer diameter of the locking portion 213 is larger than the outer diameter of the positioning portion 212. The support portion 211 is at least partially located within the inner cavity 1220 of the rotor 122, and the positioning portion 212 is located below the rotor 122. By extending at least a portion of the support portion 211 into the inner cavity 1220 of the rotor 122, the axial dimension of the electric valve can be reduced, facilitating a reduction in the valve's size and achieving miniaturization. The support portion 211 includes a through hole 2110, which longitudinally supports the rotor component 12 of the electric valve. The shaft portion 123 of the bracket 121 passes through the through hole 2110 of the support portion and extends into the inner cavity 210 of the first gear ring. The shaft portion 123 includes an input gear portion 1211, which is located in the inner cavity 210 of the first gear ring and meshes with the first-stage planetary gear 232. The shaft portion 123 has a clearance fit with the wall 2111 of the through hole 2110 formed by the support portion. This arrangement improves the transmission reliability between the rotor component 12 and the gear reduction mechanism 2.

[0036] Specifically, the support 121 includes a lower step portion 1212 with the stepped surface facing downwards, an input gear portion 1211 located below the lower step portion 1212, a step surface 1214 of the lower step portion 1212 in contact with the upper end surface 2112 of the support portion, a step wall 1213 of the lower step portion 1212 in clearance fit with the hole wall 2111 forming the through hole 2110, and the support portion 211 and the lower step portion 1212 cooperate to rotatably support the support 121, that is, the rotor component 12 can rotate circumferentially relative to the first gear ring 21.

[0037] The outer wall of the positioning part 212 is clearance-fitted with the inner wall of the equal-diameter section 311 of the first housing part 31. Here, "clearance fit" refers to a fit with a gap (including a minimum gap of zero). In this embodiment, specifically, the gap between the outer peripheral wall of the positioning part 212 and the inner wall of the equal-diameter section 311 of the first housing part 31 is 0 ≤ g < 0.2 mm. The positioning part 212 consists of several ribs extending axially along the first gear ring 21, with grooves formed between adjacent ribs. This saves material and reduces the weight of the first gear ring 21. The engaging part 213 includes a first recess 2131, and the second gear ring 22 includes a first protrusion 2212 protruding towards the control component 1. The first protrusion 2212 is located at the upper end of the second gear ring 22, and the first protrusion 2212 and the first recess 2131 engage to restrict the circumferential rotation of the first gear ring 21, i.e., the first gear ring 21 and the second gear ring 22 are circumferentially limited and connected.

[0038] Of course, it is conceivable that, conversely, the snap-fit ​​part 213 can be provided with a protrusion, and the second gear ring 22 can be provided with a concave part, thus achieving circumferential limiting through the interlocking of the protrusion and concave parts. Alternatively, the first gear ring 21 and the second gear ring 22 can also be fixedly connected by welding.

[0039] Furthermore, it also includes an elastic element 5. In the longitudinal direction of the electric valve, the elastic element 5 is disposed between the expanded diameter section 312 of the first housing portion 31 and the locking portion 213, and elastically abuts against the inner wall of the expanded diameter section 312 and the upper end face of the locking portion 213 to prevent axial movement of the first gear ring 21 and the second gear ring 22. The elastic element 5 here can be as follows: Figure 8 The elastic ring shown is made of non-metallic materials such as rubber, but it can also be a metal spring made of metallic materials. The first gear ring 21 is radially limited by the positioning rod 16, the second housing part 32 is circumferentially limited by the second gear ring 22, the second gear ring 22 is circumferentially limited by the first gear ring 21, and the first housing part 31 is axially limited by the first gear ring 21. The positioning of the first gear ring 21 and the second gear ring 22 can be achieved without welding. This method simplifies component assembly and eliminates the need for welding.

[0040] like Figure 5a , Figure 6aAs shown, the second gear ring 22 is an integral structure, roughly cylindrical in shape with a larger upper diameter and a smaller lower diameter, and is made of metal powder metallurgy. The second gear ring 22 includes a large-diameter section 221 and a small-diameter section 222. The aforementioned second internal teeth 2211 are provided on the inner peripheral wall of the large-diameter section 221, and the aforementioned first protrusion 2212 is provided at the upper end of the large-diameter section 221. The large-diameter section 221 includes a second protrusion 2213, which protrudes radially outward from the outer peripheral wall of the large-diameter section 221. The stepped wall 3211 of the outer stepped portion 321 of the second housing portion 32 includes a second recess 3210. The second protrusion 2213 and the second recess 3210 engage in a convex-concave-convex fit to restrict the circumferential rotation of the second gear ring 22. In this embodiment, since the second gear ring 22 is made of metal powder metallurgy, the second inner tooth 2211, the first protrusion 2212, and the second protrusion 2213 are integrally formed during manufacturing, which is convenient for processing. The second housing part 32 is made of metal sheet or tube by stretching, and the second recess 3210 only needs to be machined, which is also convenient for processing. In addition, the second gear ring 22 and the second housing part 32 are positioned by a convex-concave fit, which simplifies assembly.

[0041] Of course, it is conceivable that, conversely, the second gear ring 22 can be provided with a recess, and the second housing part 32 can be provided with a protrusion, thus achieving circumferential limiting through the concave-convex fit. Alternatively, the second gear ring 22 and the second housing part 32 can also be fixedly connected by welding.

[0042] Furthermore, as shown in the figure Figure 6b , Figure 8 , Figure 9 As shown, the small-diameter section 222 is at least partially located within the cavity of the reduced-diameter section 322 of the second housing portion 32. The second gear ring 22 includes a through hole 2201 extending longitudinally along the electric valve. The transmission rod 41 passes through the through hole 2201 and is clearance-fitted with the hole wall forming the through hole 2201. The transmission rod 41 is rotatable relative to the second gear ring 22. The upper end of the transmission rod 41 is located within the cavity 30 of the housing component, and the lower end of the transmission rod 41 is located within the cavity 40 of the valve body component. The advantage is that the second gear ring 32 is made of a self-lubricating metal powder metallurgy material, resulting in low frictional resistance when the transmission rod 41 rotates and reducing wear on the transmission shaft 41 during rotation, thus improving its service life. In this embodiment, the second gear ring 32 integrates the function of a bearing, eliminating the need for a separate bearing and reducing the number of parts.

[0043] Furthermore, such as Figure 10 , Figure 9 , Figure 11 and Figure 9As shown, the second gear ring 22 also includes a transition section 223, which is located between the large diameter section 221 and the small diameter section 222. The output gear carrier 261 is placed above the transition section 223. The through hole 2201 of the second gear ring 22 includes the inner hole 2220 of the small diameter section 222 and the inner hole 2230 of the transition section 223.

[0044] The second gear ring 22 also includes a limiting protrusion 2231, which protrudes from the transition section 223 toward the control component 1. Furthermore, the limiting protrusion 2231 is connected to the inner circumferential wall of the large-diameter section 221. During metal powder metallurgy, the limiting protrusion 2231 is integrally formed on the second gear ring 22. The side of the output gear carrier 261 facing the valve body component 4 includes a limiting groove 264. The limiting protrusion 2231 is at least partially located in the limiting groove 264. The limiting protrusion 2231 can abut against the two groove walls 266 of the limiting groove 264 to limit the rotational stroke of the output gear carrier 261, which in turn limits the rotational stroke of the drive shaft 41. This arrangement limits the rotational stroke of the valve core 42, enabling the electric valve to fully open, fully close, and regulate flow. It should be noted that the valve core of the electric valve in this embodiment is a spherical valve core. If the valve core angle is defined as 0° when the electric valve is in the fully closed state, then when the valve core rotates 90° to reach the fully open state, that is, the two groove walls 266 of the limiting groove 264 limit the maximum stroke of the output gear frame 261 to 90°. In this embodiment, the valve core 42 is generally spherical, but it is not limited to spherical, for example, it can be hemispherical or spindle-shaped.

[0045] Furthermore, two limiting protrusions 2231 are provided, and they are symmetrically arranged relative to the central axis of the through hole 2220 of the small diameter section 222. Correspondingly, two limiting grooves 264 that cooperate with the limiting protrusions 2231 are also provided. This arrangement is beneficial to the smooth circumferential rotation of the output gear carrier 261 and the reliable limiting.

[0046] The output gear carrier 261 also includes a third protrusion 265 on the side facing the valve body component 4. The lower end of the third protrusion 265 is generally arc-shaped or platform-shaped, and the third protrusion 265 abuts against the transition section 223. By providing the third protrusion 265, the contact area between the output gear carrier 261 and the transition section 223 can be reduced, thereby reducing the wear of the output gear carrier 261 and improving its service life.

[0047] The transmission rod 41 includes a flange portion 411, which is located below the small diameter section 222 of the second gear ring 22. The flange portion 411 can abut against the lower end of the small diameter section 222 to restrict the axial upward movement of the transmission rod 41. This can prevent the transmission rod 41 from tilting the output gear carrier 261 and affecting the reliable transmission of the reduction gear mechanism 2.

[0048] Furthermore, the second gear ring 22 includes a connecting channel 200, which connects the inner cavity 220 of the second gear ring and the inner cavity 40 of the valve body component. The connecting channel 200 includes a connecting hole 2230 and a side groove 2221. The connecting hole 2230 is located in the transition section 223 and extends through the transition section 223. The side groove 2221 is located on the outer peripheral wall of the small diameter section 222 and extends longitudinally along the second gear ring 22. By providing the connecting channel 200, the internal circulation of the electric valve can be enhanced, lubricating and dissipating heat for the gear reduction mechanism 2, thereby increasing its service life.

[0049] Figure 10 A cross-sectional view of another second gear ring provided by the present invention; Figure 11 for Figure 10 Schematic diagram of the structure of the second gear ring; Figure 10 A schematic diagram of another output gear carrier provided by the present invention.

[0050] like ​ , ​ , ​ As shown, the main difference between this embodiment and the above embodiments lies in the mating structure of the second gear ring and the output gear carrier.

[0051] The second gear ring 22A includes a transition section 223A, and the output gear carrier 261A is located in the transition section 223A. The transition section 223A includes an arc-shaped hole 2232A, such as... ​ As shown, the arc-shaped hole 2232A is specifically an arc-shaped through hole, but it can also be a blind hole. The side of the output gear carrier 261A facing the valve body component 4 includes a limiting boss 266A. The limiting boss 266A is at least partially located within the arc-shaped hole 2232A. The limiting boss 266A can abut against the two end walls 2233A forming the arc-shaped hole 2232A to limit the rotational stroke of the output gear carrier 261A, which in turn limits the rotational stroke of the drive shaft 41. This configuration limits the rotational stroke of the valve core 42, realizing the fully open, fully closed, and flow regulation functions of the electric valve. It should be noted that the valve core of the electric valve in this embodiment is a spherical valve core. If the valve core angle is defined as 0° in the fully closed state, then when the valve core rotates 90° to reach the fully open state, that is, the two end walls 2233A of the arc-shaped hole 2232A limit the maximum rotational stroke of the output gear carrier 261A to 90°.

[0052] like ​ As shown, the difference between this embodiment and the above embodiment lies in the setting of the connecting channel of the second gear ring.

[0053] In this embodiment, the second gear ring 22A includes a connecting channel 200A, which connects the inner cavity 220 of the second gear ring and the inner cavity 40 of the valve body component. The connecting channel 200A includes an arc-shaped hole 2232A and the aforementioned side groove 2221. The arc-shaped hole 2232A communicates with the aforementioned side groove 2221 and is a through hole that penetrates the transition section 223A. That is, the arc-shaped hole 2232A not only provides circumferential restraint for the output gear carrier 261A but also functions as a connecting hole. In this solution, the second gear ring 22A does not need to have a specially designed connecting hole.

[0054] Furthermore, two limiting bosses 266A are provided, symmetrically arranged relative to the central axis of the central hole 2610A. Correspondingly, two arc-shaped holes 2232A that mate with the limiting bosses 266A are also provided. This arrangement facilitates smooth circumferential rotation of the output gear carrier 261A and ensures reliable limiting.

[0055] Of course, the limiting method is not limited to this. As a variation, the second gear ring can be provided with a limiting protrusion, and the output gear carrier can be provided with a limiting boss. The limiting boss and the limiting protrusion can cooperate to limit the circumferential rotation stroke of the output gear carrier.

[0056] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An electric valve, characterized in that, The device includes a control component, a gear reduction mechanism, and a valve core. The control component includes a rotor component. The gear reduction mechanism includes a first internal tooth, a second internal tooth, and an upper planetary gear assembly and a lower planetary gear assembly arranged longitudinally along the electric valve. The rotor component includes an input gear section that meshes with the planetary gears of the upper planetary gear assembly. The planetary gears of the upper planetary gear assembly mesh with the first internal tooth, and the planetary gears of the lower planetary gear assembly mesh with the second internal tooth. The lower planetary gear assembly is capable of driving the valve core to rotate. The module of the planetary gears of the upper planetary gear assembly is smaller than the module of the planetary gears of the lower planetary gear assembly.

2. The electric valve as described in claim 1, characterized in that, The rotor component includes a rotor and a support, which are fixedly connected. The support includes a shaft, and the lower section of the shaft is integrally provided with the input gear. The planetary gears of the upper planetary gear assembly include a first-stage planetary gear and a second-stage planetary gear. The input gear meshes with the first-stage planetary gear, and the first-stage planetary gear and the second-stage planetary gear have the same module.

3. The electric valve as described in claim 1, characterized in that, The lower planetary gear assembly includes a third-stage planetary gear and a fourth-stage planetary gear, wherein the third-stage planetary gear and the fourth-stage planetary gear have the same module.

4. The electric valve as described in claim 1, characterized in that, The control component further includes a coil, and the housing component includes a first housing portion and a second housing portion. The first housing portion includes a constant diameter section and an expanded diameter section. The rotor component is located inside the constant diameter section, and the coil is fitted over the constant diameter section. The second housing portion includes a cylindrical portion, and the expanded diameter section is fixedly connected to the cylindrical portion. At least a portion of the first internal teeth are located in the inner cavity of the constant diameter section, and at least a portion of the second internal teeth are located in the inner cavity of the cylindrical portion.

5. The electric valve according to any one of claims 1-4, characterized in that, The control component also includes a spring and a positioning seat. The rotor component, the spring, and the positioning seat are located inside the housing component. The positioning seat is located above the rotor component. One end of the spring abuts against the positioning seat, and the other end of the spring abuts against the support of the rotor component.

6. The electric valve according to any one of claims 1-4, characterized in that, The control component further includes a positioning rod and a positioning seat. The positioning rod passes through the through hole of the rotor component and is clearance-fitted with the hole wall forming the through hole. The positioning seat is located above the rotor component. The upper end of the positioning rod is located in the first blind hole of the positioning seat. The positioning rod passes through the rotor component, the first stage planetary gear carrier of the upper planetary gear assembly, the second stage planetary gear carrier, and the third stage planetary gear carrier of the lower planetary gear assembly.

7. The electric valve as described in claim 6, characterized in that, It also includes a transmission rod, the third-stage planetary gear carrier is rotatably connected to the transmission rod, the transmission rod is rotatably connected to the valve core, and the lower end of the positioning rod is located in the second blind hole of the transmission rod.

8. The electric valve according to any one of claims 1-4, characterized in that, The gear reduction mechanism includes a first gear ring and a second gear ring. The first gear ring is located above the second gear ring. The first gear ring includes a first internal tooth, and the second gear ring includes a second internal tooth. A first-stage planetary gear set and a portion of the second-stage planetary gear set are located in the inner cavity of the first gear ring, and a third-stage planetary gear set and another portion of the second-stage planetary gear set are located in the inner cavity of the second gear ring.

9. The electric valve as described in claim 8, characterized in that, The first gear ring includes a snap-fit ​​portion, the snap-fit ​​portion includes a first recess, the second gear ring includes a first protrusion, the first protrusion is located at the upper end of the second gear ring, and the first protrusion and the first recess are in a convex-concave fit; or the snap-fit ​​portion includes a first protrusion protruding toward the valve body component, the second gear ring includes a first recess, and the first protrusion and the first recess are in a convex-concave fit.

10. The electric valve as described in claim 9, characterized in that, The first gear ring further includes a positioning part and a support part. The positioning part is located above the snap-fit ​​part, and the support part is located above the positioning part. The outer diameter of the snap-fit ​​part is larger than the outer diameter of the positioning part, and the outer diameter of the positioning part is larger than the outer diameter of the support part. The electric valve further includes a first housing part. The rotor component is located in the inner cavity of the first housing part. The rotor component includes a rotor, which is located above the positioning part. The outer wall of the positioning part is in clearance fit with the inner wall of the first housing part. The support part is at least partially located in the inner cavity of the rotor, and the support part supports the rotor component.

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