Electric butterfly valve

Abstract

The utility model relates to an electric butterfly valve which comprises a valve body part, a valve element part, a valve rod and a cover body, the valve element part is located in an inner cavity of the valve body part, the electric butterfly valve is characterized by further comprising a supporting piece and a gasket, the valve body part comprises a first base part, a valve element installation part and a second base part, at least part of the valve rod is located in the first base part, and the valve element installation part is located in the second base part. The valve element component is located on the valve element installation portion, at least part of the supporting piece is located in the second base portion, and the supporting piece is in clearance fit with the second base portion. In the longitudinal direction of the electric butterfly valve, the gasket abuts against the second base part and the cover body, and the cover body is fixedly connected with the second base part; in the transverse direction of the electric butterfly valve, the projection of the inner wall of the second base part is located on the inner side of the inner edge of the projection of the gasket, and therefore outleakage caused by center penetrating leakage of the supporting piece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to an electric butterfly valve. Background Art

[0002] An electric butterfly valve generally includes a drive head, a valve body, a valve core component and an end cover. Figure 6A The following shows a partial schematic view of an electric butterfly valve in the background art. Figure 6B As shown in Figure 6A the partial enlarged view at B in Brief Summary of the Utility Model

[0003] The purpose of the utility model is to provide an electric butterfly valve which can improve the risk of external leakage at the end cover part.

[0004] The electric butterfly valve provided by this application, an electric butterfly valve, includes a valve body component, a valve core component, a valve stem and a cover body. The valve core component is located in the inner cavity of the valve body component. It further includes a support member and a gasket. The valve body component includes a first base, a valve core installation part and a second base. At least part of the valve stem is located in the first base. The valve core component is located in the valve core installation part. At least part of the support member is located in the second base. The support member is in clearance fit with the second base. In the longitudinal direction of the electric butterfly valve, the gasket abuts against the second base and the cover body. The cover body is fixedly connected to the second base. In the transverse direction of the electric butterfly valve, the projection of the inner wall of the second base is located inside the inner edge of the projection of the gasket, so as to improve the external leakage caused by the through-hole leakage of the support member by setting the gasket. Description of the Drawings

[0005] Figure 1 The following shows a partial structural schematic view of an embodiment of the electric butterfly valve of this application;

[0006] Figure 2 For Figure 1 the partial structural schematic view of the corresponding part of the electric butterfly valve shown in the other direction;

[0007] Figure 3 As shown in Figure 2 the structural schematic view of the part below X in

[0008] Figure 4 As shown in Figure 3 the partial enlarged schematic view at Y in

[0009] Figure 5 As shown Figure 2 a partial enlarged schematic view at position Z;

[0010] Figure 6A As shown is a partial schematic view of a kind of electric butterfly valve in the background art;

[0011] Figure 6B As shown Figure 6A a partial enlarged view at position B. Specific embodiments

[0012] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0013] As shown in the figure, the electric butterfly valve of this embodiment includes a valve body component 20 and a valve core component 30, and the valve core component 30 is installed in the inner cavity of the valve body component 20.

[0014] The electric butterfly valve of the present application can be applied to a centrifugal unit, for example, applied to systems such as a magnetic levitation centrifuge unit, such as Figure 1 , Figure 3 and Figure 4 As shown, the valve body component 20 includes a valve body 21, and the valve body 21 includes a first base 2121, a valve core installation part 2122 and a second base 2123. In the longitudinal direction of the electric butterfly valve, the first base 2121 is located above the valve core installation part 2122. The valve core installation part 2122 is specifically annular in this embodiment, and the valve core installation part 2122 is located between the first base 2121 and the second base 2123. The valve core installation part 2122 includes a first fluid port A and a second fluid port B.

[0015] The valve core component 30 includes a valve core 31, and the valve stem 32 of the electric butterfly valve is fixedly connected or limitedly connected to the valve core 31. The fixed connection here means that the two can be connected by bolts or directly by thread fitting. The limited connection here means that the two can be connected in a non-fixed manner with a certain degree of play through snap fit or the like, as long as the valve stem 32 can drive the valve core 31 to rotate to achieve this function. Or, on the premise of meeting the assembly requirements of the valve core component and the valve body component, the valve core 31 and the valve stem 32 can also be an integral structure, that is, integrally formed. The valve core 31 is in a disc shape and is located within the valve core installation part 2122.

[0016] Such as Figure 3 As shown, the valve stem 32 is in transmission connection with a driving component (not shown), and the driving component can drive the valve stem 32 to rotate to adjust the flow rate between the first fluid port A and the second fluid port B of the electric butterfly valve. The flow rate here refers to all cases where it is greater than or equal to 0.

[0017] The electric butterfly valve of the present application can be used in an oil-free system environment such as a magnetic levitation centrifugal unit. Especially when used in an oil-free system environment, high requirements are imposed on the anti-friction property between the moving parts of the product, such as the transmission reliability and service life of a gear set (not shown).

[0018] As Figure 2 shown, the valve core component 30 further includes a support member 34. The support member 34 is supported by a cover body 40. The cover body 40 is fixedly connected to the second base portion 2123 of the valve body 21 by screws or bolts or is thread-connected therewith. The support member 34 is at least partially located within the second base portion 2123 of the valve body 21 and is in sealing fit with the inner wall of the second base portion 2123. The upper end portion of the support member 34 is located within the receiving hole at the lower end portion of the valve core 31, and the two are in concave-convex fit. At least one sealing member 50 is sleeved on the outer periphery of the support member 34. The sealing member 50 abuts and seals against the outer wall of the support member 34 and the inner wall of the second base portion 2123 of the valve body 21 to prevent external leakage, that is, to prevent external leakage from the contact portion between the outer wall of the support member 34 and the second base portion 2123. The sealing member 50 may specifically be an O-ring, and the number is not limited.

[0019] The support member 34 is made by stretching an extruded metal bar stock, and there are long air holes at the material shaft outlet. Under high-pressure refrigerant, the refrigerant will overflow along the air holes of the support member 34, resulting in a phenomenon of through-core leakage and causing external leakage of the product.

[0020] To solve the aforementioned through-core leakage phenomenon, one way is to use a plate instead of a bar stock. However, since the support member 34 is relatively long, there is no plate with a corresponding thickness available for selection, and the cost is high.

[0021] Therefore, the present application provides a solution to the problem of external leakage at the contact portion between the cover body 40 and the valve body 21 without significantly modifying other structures of the product.

[0022] As Figures 2 - 4 shown, the second base portion 2123 of the valve body 21 is fixedly connected to the cover body 40. The two may be thread-connected or connected by a plurality of screws or bolts. In this embodiment, the two are fixedly connected by screws 60.

[0023] A gasket 70 is provided between the second base 2123 and the cover body 40, and the second base 2123 is connected to the cover body 40. In the longitudinal direction of the electric butterfly valve, the gasket 70 abuts against the valve body component 20 and the cover body 40. Specifically, in this embodiment, the gasket 70 is annular, and the gasket 70 abuts between the second base 2123 and the cover body 40. In the transverse direction of the electric butterfly valve (i.e., the direction perpendicular to the length direction of the valve stem 32), the projection of the inner wall of the second base 2123 is located inside the inner edge of the projection of the gasket 70. Since the inner wall of the second base 2123 is in clearance fit with at least part of the outer wall of the support member 34, the above projection relationship can prevent the fluid after the support member 34 has a through-hole leak from leaking out by the gasket 70.

[0024] The outer edge of the projection of the seal 50 is located inside the inner edge of the projection of the gasket 70. That is, when the seal 50 is circular and the gasket 70 is also circular, the inner diameter of the gasket 70 is greater than the outer diameter of the seal 50. The purpose is that since the seal 50 cannot solve the through-hole leak of the support member 34, the aforementioned gasket 70 is added. When the support member 34 has a through-hole leak, the gasket 70 can improve the risk of external leakage at the contact part between the valve body 21 and the cover body 40.

[0025] The material of the gasket 70 can be a non-metallic material, such as polytetrafluoroethylene, asbestos-free gasket, rubber or O-ring, etc. The material of the gasket 70 can also be a metallic material with a certain amount of deformation, such as aluminum gasket, copper gasket, metal wound gasket, etc.

[0026] As Figure 2 and Figure 3 shown, the support member 34 includes a support member body portion 341, and at least part of the outer wall of the support member body portion 341 is in clearance fit with the second base 2123 of the valve body 21. The seal 50 is sleeved on the outer periphery of the support member body portion 341. There can be two seals 50, which are arranged at intervals in the axial direction of the support member body portion 341 to further improve the sealing performance between the support member 34 and the second base 2123. The support member body portion 341 is cylindrical, and its outer diameter is smaller than the inner diameter of the gasket 70. After the support member 34 has a through-hole leak, the gasket 70 can prevent external leakage.

[0027] As Figure 3 and Figure 4 shown, the cover body 40 includes a cover body main portion 401 and a cover body insertion portion 403, and both the cover body main portion 401 and the cover body insertion portion 403 are cylindrical. The second base 2123 includes a first stepped hole 2124 with a stepped surface facing the cover body 40. The gasket 70 is sleeved on the outer periphery of the cover body insertion portion 403, and the cover body insertion portion 403 is partially inserted into the first stepped hole 2124. The first stepped hole 2124 facilitates the radial positioning of the cover body 40 and the valve body 21.

[0028] Further, the cover 40 further includes a gasket support portion 402. The gasket support portion 402 is cylindrical, with an outer diameter larger than that of the cover insertion portion 403 and smaller than that of the cover body portion 401. The gasket support portion 402 supports the gasket 70. The second base portion 23232123 further includes a second stepped hole 2125 with a stepped surface facing the cover 40. The aperture of the second stepped hole 2125 is larger than that of the first stepped hole 2124. The gasket 70 is circumferentially and radially located between the inner wall of the second stepped hole 2125 and the outer wall of the cover insertion portion 403 of the cover 40, and axially located between the stepped surface of the second stepped hole 2125 and the end surface of the gasket support portion 402, so that the gasket 70 is limited in both the radial and axial directions. When the cover 40 is fixedly connected to the valve body 21, the cover 40 axially presses the gasket 70, causing the gasket 70 to form a seal between the lower end surface of the second base portion 2123 and the end surface of the gasket support portion 402 of the cover 40. Even if the material of the support member 34 has a through-hole leak, due to the sealing effect of the gasket 70, the external leakage of the electric butterfly valve can be improved or even avoided.

[0029] Furthermore, in order to form multiple seals and provide multiple protections for the seal, as Figure 4 shown, the lower end of the second base portion 2123 of the valve body 21 includes a hard seal ring portion 210. The hard seal ring portion 210 is located on the outer periphery of the gasket support portion 402 of the cover 40 and forms a hard seal fit with the hard seal end surface 4011 of the cover body portion 401 located outside the gasket support portion 402.

[0030] As Figure 3 and 5 shown, the lower end of the valve core 31 includes a receiving hole 310. The support member 34 further includes a support portion 342 located on the upper part of the support member body portion 341. The valve core 31 can rotate relative to the support portion 342 under the drive of the valve stem 32. The support portion 342 is located in the receiving hole 310, and the valve core wear-reducing member 37 is at least partially located in the receiving hole 310. Specifically in this embodiment, the valve core wear-reducing member 37 is made of a non-metallic material. The valve core wear-reducing member 37 is sleeved on the support portion 342, and the lower end surface of the valve core wear-reducing member 37 does not contact the support member body portion 341 to prevent contact friction between the opposite end surfaces of the valve core wear-reducing member 37 and the support member body portion 341. As Figure 5 shown, the valve core wear-reducing member 37 includes an upper positioning portion 371 and a socket portion 372. The socket portion 372 is cylindrical and is located between the outer wall of the support portion 342 and the inner wall of the receiving hole 310. The upper positioning portion 371 is plate-shaped and is located between the bottom wall of the receiving hole 310 and the support portion 342. The upper positioning portion 371 of the valve core wear-reducing member 37 abuts against the bottom wall of the receiving hole 310 and the upper end of the support portion 342. The valve core wear-reducing member 37 is used to prevent metal-to-metal friction between the valve core 31 and the support portion 342 when the valve core 31 rotates.

[0031] It should be noted that the above are only examples of the specific implementation manners of the present utility model, and should not be construed as limitations on the protected points of the present utility model. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can still be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model.

Claims

1. An electric butterfly valve, comprising a valve body component (20), a valve core component (30), a valve stem (32) and a cover body (40), wherein the valve core component (30) is located in the inner cavity of the valve body component (20), and characterized in that: It also includes a support member (34) and a gasket (70), the valve body member (20) includes a first base (2121), a valve core mounting portion (2122) and a second base (2123), the valve stem (32) is at least partially located in the first base (2121), the valve core member (30) is located in the valve core mounting portion (2122), the support member (34) is at least partially located in the second base (2123), and the support member (34) and the second base (2123) are loosely matched; in the longitudinal direction of the electric butterfly valve, the gasket (70) abuts against the second base (2123) and the cover body (40), and the cover body is fixedly connected to the second base; in the transverse direction of the electric butterfly valve, the projection of the inner wall of the second base (2123) is located on the inner side of the inner edge of the projection of the gasket (70).

2. The electric butterfly valve according to claim 1, characterized in that: The support member (34) comprises a support member body (341), the support member body (341) is cylindrical, the support member body (341) is loosely fitted with the second base (2123), the gasket (70) is annular, and the inner diameter of the gasket (70) is greater than the outer diameter of the support member body (341).

3. The electric butterfly valve according to claim 2, characterized in that: It also includes at least one sealing member (50), which is sleeved on the outer periphery of the support member body (341), and the sealing member (50) abuts against the outer wall of the support member body (341) and the inner wall of the second base (2123).

4. The electric butterfly valve according to any one of claims 1 to 3, characterized in that: The cover body (40) includes a cover body main body (401) and a cover body insertion part (403), the second base (2123) includes a first step hole (2124) with a step surface facing the cover body, the cover body insertion part (403) is cylindrical, and the cover body insertion part (403) is partially located in the first step hole (2124), and the gasket (70) is sleeved on the outer periphery of the cover body insertion part (403).

5. The electric butterfly valve according to claim 4, characterized in that: The cover body (40) includes a gasket support portion (402), which is cylindrical. The outer diameter of the gasket support portion (402) is larger than the outer diameter of the cover body insertion portion (403). The second base (2123) includes a second step hole (2125) with a step surface facing the cover body. The aperture of the second step hole (2125) is larger than the aperture of the first step hole (2124). The gasket support portion (402) supports the gasket (70), and the gasket (70) is located between the hole wall of the second step hole (2125) and the outer wall of the cover body (40) insertion portion (403).

6. The electric butterfly valve according to claim 5, characterized in that: The lower end of the second base (2123) includes a hard sealing ring portion (210), and the cover body (401) includes a hard sealing end surface (4011) located on the outside of the gasket support portion (402), and the hard sealing ring portion (210) abuts against the hard sealing end surface (4011).

7. The electric butterfly valve according to any one of claims 1 to 3, characterized in that: The material of the gasket (70) is one of E, asbestos-free gasket, rubber, O-ring, aluminum, copper, and metal winding gasket.

8. The electric butterfly valve according to any one of claims 1 to 3, characterized in that: The valve core component (30) includes a valve core (31), the valve core includes a receiving hole (310), the support member (34) includes a support portion (342), the support portion (342) is located in the receiving hole (310), the valve core wear reducing member (37) is located in the receiving hole (310), the valve core wear reducing member (37) is sleeved on the support portion (342), and the valve core wear reducing member (37) is made of non-metallic material.

9. The electric butterfly valve according to claim 8, characterized in that: The valve core wear reducing member (37) comprises an upper positioning portion (371) and a sleeve portion (372); the upper positioning portion (371) is plate-shaped and is located between the bottom wall of the accommodating hole (310) and the upper end of the supporting portion (342); the sleeve portion (372) is cylindrical and is located between the outer wall of the supporting portion (342) and the hole wall of the accommodating hole (310).

10. The electric butterfly valve according to claim 3, characterized in that: The support member (34) is made of metal rod material, the gasket (70) is made of one of polytetrafluoroethylene, asbestos-free pad, rubber, O-ring, aluminum, copper, and metal winding pad, the outer diameter of the sealing member (50) is greater than the outer diameter of the support member body (341), and the inner diameter of the gasket (70) is greater than the outer diameter of the sealing member (50).

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