Electric valve

Abstract

The utility model discloses an electrically operated valve which comprises a gear reduction mechanism, the gear reduction mechanism comprises a first gear ring, a second gear ring and a planetary gear set, at least part of the second gear ring is located in an inner cavity of the first gear ring, the second gear ring supports the first gear ring, the first gear ring is made of plastic, the first gear ring is meshed with the planetary gear set, and the planetary gear set is meshed with the second gear ring. The first gear ring is made of metal, the second gear ring is made of metal, the second gear ring is meshed with the planetary gear set, one of the first gear ring and the second gear ring comprises a convex part, the other of the first gear ring and the second gear ring comprises a groove, at least part of the convex part is located in the groove, and in the circumferential direction of the first gear ring, the convex part can abut against the groove to limit rotation of the first gear ring relative to the second gear ring. According to the gear reduction mechanism, the gear reduction mechanism comprises the first gear ring and the second gear ring, the first gear ring and the second gear ring are circumferentially limited through concave-convex matching, the first gear ring is made of plastic, the cost can be reduced, the second gear ring is made of metal, and the strength requirement can be met.

Description

Technical Field

[0001] This utility model relates to the field of valve technology for refrigeration systems, and in particular to an electric valve. Background Technology

[0002] Figure 1 This is a partial cross-sectional top view of an electric valve in the background art.

[0003] like Figure 1 As shown, the electric valve includes a drive component 01, a transmission component 02, a gear reduction mechanism 03, and a valve stem 04. The transmission component 02 has a sun gear portion 021, and the gear reduction mechanism 03 includes a gear ring 031 and a planetary gear set 032. The planetary gear set 032 is located inside the gear ring 031 and meshes with it. The sun gear portion 021 meshes with the planetary gear set 032. When the electric valve is in operation, the drive component 01 can drive the transmission component 02 to rotate, which in turn drives the planetary gear set 032 to rotate. The rotation of the planetary gear set 032 can drive the valve stem 04 to rotate, and the valve stem 04 can drive the valve core (not shown) to rotate. Utility Model Content

[0004] This application provides an electric valve including a gear reduction mechanism. The gear reduction mechanism includes a first gear ring, a second gear ring, and a planetary gear set. The second gear ring is at least partially located within the inner cavity of the first gear ring and supports the first gear ring. The first gear ring is made of plastic and meshes with the planetary gear set. The second gear ring is made of metal and meshes with the planetary gear set. One of the first gear ring and the second gear ring includes a protrusion, and the other of the first gear ring and the second gear ring includes a groove. The protrusion is at least partially located in the groove. In the circumferential direction of the first gear ring, the protrusion can abut against the groove to restrict the rotation of the first gear ring relative to the second gear ring.

[0005] In this application, the gear reduction mechanism includes a first gear ring and a second gear ring. The first gear ring and the second gear ring are circumferentially limited by a convex-concave fit. The first gear ring is made of plastic, which can reduce costs, while the second gear ring is made of metal, which can ensure strength requirements. Attached Figure Description

[0006] Figure 1 This is a partial cross-sectional top view of an electric valve in the background art;

[0007] Figure 2 A cross-sectional schematic diagram of an electric valve provided by this utility model;

[0008] Figure 3 for Figure 2 Enlarged view of point Q;

[0009] Figure 4a for Figure 2 A three-dimensional structural diagram of the first gear ring in the middle;

[0010] Figure 4b for Figure 4a A schematic diagram of the half-section three-dimensional structure of the first gear ring in the middle;

[0011] Figure 5 for Figure 2 A three-dimensional structural diagram of the second gear ring;

[0012] Figure 6 for Figure 2 A three-dimensional structural diagram of the third gear ring;

[0013] Figure 7 for Figure 2 A three-dimensional structural diagram of the middle shell.

[0014] Figures 2-7 middle:

[0015] 1. Rotor assembly; 11. Shaft; 12. Rotor; 120. Inner cavity; 12. Lower end cover; 13. Sun gear; 131. Connecting part; 132. Tube part; 100. Outlet flow channel; 101. Spacing;

[0016] 2. Gear reduction mechanism; 21. First gear ring; 211. First cylindrical portion; 2111. First rack; 212. Second cylindrical portion; 2121. Protrusion; 2122. Cylindrical inner wall; 213. Support portion; 2130. Through hole; 2131. Cover portion; 2132. Upper extension portion; 214. Stepped surface; 22. Second gear ring; 221. Third cylindrical portion; 2211. Second rack; 2212. 222, Groove; 2220, Slot; 23, Third Gear Ring; 231, Fourth Cylindrical Part; 2311, Cut Section; 232, Upper Protrusion; 24, Planetary Gear Set; 241, First Stage Gear Set; 2410, First Positioning Hole; 2411, First Stage Gear Carrier; 242, Second Stage Gear Set; 2421, Second Stage Gear Carrier; 243, Third Stage Gear Carrier; 244, Output Gear Carrier;

[0017] 3. Housing components; 31. Rotor housing; 32. Housing; 321. Fifth cylindrical part; 3211. Recessed part; 3212. Upper opening;

[0018] 4. Positioning rod;

[0019] 5. Transmission rod; 50. Second positioning hole;

[0020] 6. Valve core ball. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0022] In this embodiment of the invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," and "third" may explicitly or implicitly include one or more of that feature.

[0023] The directional terms mentioned in the embodiments of this utility model, such as "up," "down," "inner," "outer," "left," and "right," are for reference only. Figure 2 The directional terms used are for the purpose of better and clearer explanation and understanding of the embodiments of this utility model, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0024] Figure 2 A cross-sectional schematic diagram of an electric valve provided by this utility model; Figure 3 for Figure 2 Enlarged view of point Q; Figure 4a for Figure 2 A three-dimensional structural diagram of the first gear ring in the middle; Figure 4b for Figure 4a A schematic diagram of the half-section three-dimensional structure of the first gear ring in the middle; Figure 5 for Figure 2 A three-dimensional structural diagram of the second gear ring; Figure 6 for Figure 2 A three-dimensional structural diagram of the third gear ring; Figure 7 for Figure 2 A three-dimensional structural diagram of the middle shell.

[0025] As shown in the figure, the electric valve in this embodiment includes a rotor component 1, a gear reduction mechanism 2, a transmission rod 5, and a valve core ball 6. The rotor component 1 includes a rotating shaft 11 and a rotor 12, which are fixedly connected. The rotor component 1 has a rotor cavity 120. The gear reduction mechanism 2 includes a first gear ring 21, a second gear ring 22, and a planetary gear set 24. Part of the planetary gear set 24 is located within the first gear ring 21 and meshes with it. Another part of the planetary gear set 24 is located within the second gear ring 22 and meshes with it. Further, the first gear ring 21 is generally tower-shaped and made of plastic, specifically through plastic injection molding. The second gear ring 22 is generally annular and made of metal, specifically through metal powder metallurgy. The second gear ring 22 is at least partially located within the first gear ring 21 and supports it. One of the first gear ring 21 and the second gear ring 22 includes a protrusion, and the other of the first gear ring 21 and the second gear ring 22 includes a groove. The protrusion is at least partially located in the groove. In the circumferential direction of the first gear ring 21, the protrusion can abut against the groove wall to restrict the rotation of the first gear ring 21 relative to the second gear ring 22.

[0026] The electric valve in this embodiment uses a first gear ring 21 made of plastic, which is injection molded, facilitating cost reduction and weight reduction. It also uses a second gear ring 22 made of metal, formed by metal powder metallurgy, which ensures the strength requirements of the gear reduction mechanism 2. Compared to the single gear ring structure in the prior art, the electric valve in this embodiment achieves cost reduction while maintaining strength requirements by using separate gear rings.

[0027] As a specific implementation plan, such as Figure 3 , Figure 4a , Figure 4b As shown, the first gear ring 21 includes a first cylindrical portion 211 and a second cylindrical portion 212. The first cylindrical portion 211 is located above the second cylindrical portion 212. The outer diameter of the first cylindrical portion 211 is smaller than the outer diameter of the second cylindrical portion 212. The inner wall of the first cylindrical portion 211 has a first rack 2111, which meshes with the aforementioned planetary gear set 24. The electric valve in this embodiment also includes a housing component 3, which includes a rotor housing 31. The rotor housing 31 is cylindrical with a bottom. The rotor component 1 is at least partially located inside the rotor housing 31. The first cylindrical portion 211 is at least partially located in the rotor inner cavity 120. In the radial direction of the first gear ring 21, the second cylindrical portion 212 is clearance-fitted with the rotor housing 31. The first gear ring 21 is configured as a tower-shaped structure with a smaller top and a larger bottom. The first cylindrical part 211 can extend into the inner cavity 120 of the rotor, which is beneficial to reduce the longitudinal dimension of the electric valve. The second cylindrical part 212 is clearance-fitted with the rotor housing 31, so that the rotor housing 31 can be radially centered on the first gear ring 21.

[0028] Furthermore, combining Figure 3 As shown, the first gear ring 21 also includes a support portion 213. In the longitudinal direction of the electric valve, the support portion 213 is located above the first cylindrical portion 211. The support portion 213 has a through hole 2130 at the center position. The rotating shaft 11 is clearance-fitted with the wall of the through hole 2130. With this arrangement, the first gear ring 21 can center the rotating shaft 11, that is, it can ensure the stability of the rotation of the rotor component 1.

[0029] As can be seen from the above, the second cylindrical part 212 and the rotor housing 31 are in clearance fit, which enables the rotor housing 31 to radially center the first gear ring 21. The shaft 11 and the hole wall of the through hole 2130 are in clearance fit, which enables the first gear ring 21 to center the rotor component 1, thereby ensuring the stability of the rotation of the rotor component 1.

[0030] like Figure 4a As shown, the support portion 213 specifically includes a cover portion 2131 and an upper extension portion 2132. The cover portion 2131 is plate-shaped, and the upper extension portion 2132 is annular. The upper extension portion 2132 extends upward from the cover portion 2131, and its outer diameter is smaller than that of the cover portion 2131. The upper extension portion 2132 supports the rotor component 1. By providing an upper extension portion 2132 with a smaller outer diameter, the contact area between the first gear ring 21 and the rotor component 1 is smaller, which can reduce the frictional resistance of the rotor component 1 when rotating relative to the first gear ring 21, and also extend the service life of the rotor 12 and the first gear ring 21.

[0031] like Figure 5 As shown, the second gear ring 22 includes a third cylindrical portion 221, which is at least partially located within the second cylindrical portion 212. The inner wall of the third cylindrical portion 221 has a second rack 2211, which meshes with the aforementioned planetary gear set 24. The number of second racks 2211 is the same as the number of first racks 2111. The outer wall of the third cylindrical portion 221 includes the aforementioned groove 2212, which extends to the upper end face of the third cylindrical portion 221. Since the outer wall of the third cylindrical portion 221 and the cylindrical inner wall 2122 of the second cylindrical portion 212 are in clearance fit, by providing the groove 2212 extending to the upper end face of the third cylindrical portion 221, when the first gear ring 21 and the second gear ring 22 are assembled, the protrusion can easily engage with the groove 2212 in the axial direction of the third cylindrical portion 221.

[0032] On the other hand, such as Figure 4bAs shown, the second cylindrical portion 212 of the first gear ring 21 includes the aforementioned protrusion 2121, which protrudes inward from the inner wall 2122 of the cylindrical portion. In the radial direction of the first gear ring 21, the protrusion 2121 is located outside the first gear rack 2111. The first gear ring 21 also includes a downward-facing stepped surface 214, that is, the stepped surface 214 faces the valve core ball 6 (e.g., ...). Figure 2 As shown in the diagram, the stepped surface 214 connects the first toothed rack 2111 to the cylindrical inner wall 2122, and the protrusion 2121 extends to the stepped surface 214. Since the first toothed ring in this embodiment is made of plastic injection molding, this design facilitates demolding after injection molding.

[0033] The above solution, by setting a spline-like structure, can prevent rotation after the first gear ring 21 and the second gear ring 22 are nested. At the same time, the two use different materials and processing methods, which can reduce costs and meet the requirements of rotation strength.

[0034] Furthermore, continuing as Figure 5 As shown, the second gear ring 22 also includes an extension portion 222, which extends radially outward from the third cylindrical portion 221 and includes a groove 2220. The gear reduction mechanism 2 of this embodiment also includes a third gear ring 23, which includes a fourth cylindrical portion 231 and an upper protrusion 232. The upper protrusion 232 protrudes upward from the fourth cylindrical portion 231 and is at least partially located in the groove 2220 to restrict the rotation of the second gear ring 22 relative to the third gear ring 23. The second gear ring 22 is located on the third gear ring 23, that is, the third gear ring 23 supports the second gear ring 22.

[0035] like Figure 2 , Figure 6 , Figure 7 As shown, the housing component 3 also includes a housing 32, the wall thickness of which is greater than the wall thickness of the aforementioned rotor housing 31. The housing 32 and the rotor housing 31 are fixed by welding. The housing 32 includes a recess 3211. The outer wall of the third gear ring 23 includes a cut surface 2311. The cut surface 2311 cooperates with the recess 3211 to restrict the rotation of the third gear ring 23 relative to the housing 32.

[0036] In a specific embodiment, the cut surface 2311 extends to the upper and lower ends of the fourth cylindrical portion 231. Along the longitudinal direction of the electric valve, the extension length of the recess 3211 is less than the extension length of the cut surface 2311. The housing 32 includes a fifth cylindrical portion 321, the fourth cylindrical portion 231 is located inside the fifth cylindrical portion 321, and the recess 3211 is located at a position less than half the longitudinal length of the fifth cylindrical portion 321. Extending the cut surface 2311 to the upper and lower ends of the fourth cylindrical portion 231 simplifies the processing of the cut surface 2311 and provides a position for the housing 32 to be limited in the longitudinal direction of the fifth cylindrical portion 321. Since the housing 32 is made of tubular material, the recess 3211 is specifically formed by stamping. However, stamping will affect the roundness of the upper opening 3212 of the housing 32. Therefore, the recess 3211 is located at less than half the longitudinal length of the fifth cylindrical part 321, which can reduce the impact on the roundness of the upper opening 3212 of the housing 32 (if the roundness of the opening 3212 is insufficient, the opening 3212 needs to be shaped before the housing 32 is assembled with the rotor housing 31, which increases the number of steps).

[0037] In such Figure 2 , Figure 3 In the specific embodiment shown, the aforementioned planetary gear set 24 specifically includes a first-stage gear set 241 and a second-stage gear set 242. Both the first-stage gear set 241 and the second-stage gear set 242 are made of metal. The aforementioned rotor component 1 also includes a sun gear 13, which is fixedly connected to the rotating shaft 11. The sun gear 13 meshes with the first-stage gear set 241, which meshes with the first gear ring 21. The second-stage gear set 242 meshes with the second gear ring 22. Because the first gear ring 21 is closer to the sun gear 13 (torque input end) than the second gear ring 22, the first gear ring 21 needs to bear a smaller load and has lower strength requirements; therefore, the first gear ring 21 can be made of plastic.

[0038] Furthermore, the electric valve in this embodiment also includes a positioning rod 4. The aforementioned first-stage gear set 241 includes a first-stage gear carrier 2411, the second-stage gear set 242 includes a second-stage gear carrier 2421, and the planetary gear set 24 also includes a third-stage gear carrier 243 and an output gear carrier 244. The first-stage gear carrier 2411 includes a first positioning hole 2410, and the positioning rod 4 passes through the second-stage gear carrier 2421 and the third-stage gear carrier 243. The aforementioned transmission rod 5 and output gear carrier 244 can be keyway-fitted or integrally formed, as long as the output gear carrier 244 can drive the transmission rod 5 to rotate. The transmission rod 5 includes a second positioning hole 50, the upper end of the positioning rod 4 is located in the first positioning hole 2410, and the lower end of the positioning rod 4 is located in the second positioning hole 50. By setting the positioning rod 4, the risk of jamming caused by eccentricity of the planetary gear carriers of the planetary gear set 24 can be reduced.

[0039] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0040] The above examples illustrate the principles and implementation methods of this utility model. The descriptions of these embodiments are merely for the purpose of aiding understanding this utility model. It should be noted that those skilled in the art can make various improvements and modifications to this utility model without departing from its principles, and these improvements and modifications also fall within the protection scope of this utility model.

Claims

1. An electric valve, characterized in that, include: A gear reduction mechanism includes a first gear ring, a second gear ring, and a planetary gear set. The second gear ring is at least partially located within the first gear ring. The first gear ring is made of plastic and meshes with the planetary gear set. The second gear ring is made of metal and meshes with the planetary gear set. One of the first and second gear rings includes a protrusion, and the other includes a groove. The protrusion is at least partially located within the groove. In the circumferential direction of the first gear ring, the protrusion can abut against the groove wall to restrict the rotation of the first gear ring relative to the second gear ring.

2. The electric valve according to claim 1, characterized in that, The first gear ring includes a first cylindrical portion and a second cylindrical portion. The first cylindrical portion is located above the second cylindrical portion. The inner wall of the first cylindrical portion has a first rack, which meshes with the planetary gear set. The second cylindrical portion includes a cylindrical inner wall and a protrusion. The protrusion protrudes inward from the cylindrical inner wall. In the radial direction of the first gear ring, the protrusion is located outside the first rack. The first gear ring also includes a downward stepped surface. The stepped surface connects the first rack and the cylindrical inner wall. The protrusion extends to the stepped surface.

3. The electric valve according to claim 2, characterized in that, It also includes a rotor component, which includes a rotating shaft. The first gear ring further includes a support portion, which is located above the first cylindrical portion. The support portion has a through hole, through which the rotating shaft passes. The rotating shaft is clearance-fitted with the wall of the through hole. The support portion includes a cover portion and an upper extension portion. The cover portion is plate-shaped, and the upper extension portion is annular. The upper extension portion extends upward from the cover portion, and the outer diameter of the upper extension portion is smaller than the outer diameter of the cover portion. The upper extension portion supports the rotor component, and the second gear ring supports the first gear ring.

4. The electric valve according to claim 2, characterized in that, The second gear ring includes a third cylindrical portion, which is at least partially located within the second cylindrical portion. The inner wall of the third cylindrical portion has a second rack that meshes with the planetary gear set. The number of the second racks is the same as the number of the first racks. The outer wall of the third cylindrical portion includes the groove that extends to the upper end face of the third cylindrical portion.

5. The electric valve according to claim 2, characterized in that, The outer diameter of the first cylindrical portion is smaller than the outer diameter of the second cylindrical portion. The electric valve also includes a rotor component and a rotor housing. The rotor component is at least partially located inside the rotor housing and has a rotor cavity. The first cylindrical portion is at least partially located inside the rotor cavity. In the radial direction of the first gear ring, the second cylindrical portion is in clearance fit with the rotor housing.

6. The electric valve according to claim 4, characterized in that, The second gear ring further includes an extension portion extending outward from the third cylindrical portion. The extension portion includes a slot. The electric valve further includes a third gear ring, which includes a fourth cylindrical portion and an upper protrusion. The upper protrusion protrudes upward from the fourth cylindrical portion and is at least partially located in the slot. The third gear ring supports the second gear ring.

7. The electric valve according to claim 1, characterized in that, It also includes a housing component and a third gear ring. The housing component includes a housing and a rotor housing, which are fixedly connected. The housing includes a recess. The third gear ring supports the second gear ring. The outer wall of the third gear ring includes a cut surface that engages with the recess to restrict the rotation of the third gear ring relative to the housing.

8. The electric valve according to claim 7, characterized in that, The third gear ring includes a fourth cylindrical portion, the cut surface extends to the upper and lower ends of the fourth cylindrical portion, along the longitudinal direction of the electric valve, the extension length of the recess is less than the extension length of the cut surface, the housing includes a fifth cylindrical portion, the fourth cylindrical portion is located inside the fifth cylindrical portion, and the recess is located at a position less than half the longitudinal length of the fifth cylindrical portion.

9. The electric valve according to claim 3 or 5, characterized in that, The planetary gear set includes a first-stage gear set and a second-stage gear set. The first-stage gear set is made of metal. The rotor component includes a shaft and a sun gear. The sun gear is fixedly connected to the shaft and meshes with the first-stage gear set. The first-stage gear set meshes with the first gear ring. The second-stage gear set is made of metal and meshes with the second gear ring.

10. The electric valve according to any one of claims 1-8, characterized in that, It also includes a positioning rod and a transmission rod. The planetary gear set includes a first-stage gear carrier, a second-stage gear carrier, a third-stage gear carrier, and an output gear carrier. The first-stage gear carrier includes a first positioning hole. The positioning rod passes through the second-stage gear carrier and the third-stage gear carrier. The transmission rod and the output gear carrier are keyway-fitted or are an integral structure. The transmission rod includes a second positioning hole. The upper end of the positioning rod is located in the first positioning hole, and the lower end of the positioning rod is located in the second positioning hole.

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