A control valve

Abstract

The utility model discloses a control valve, the base of the valve seat comprises a first annular groove and a first communicating groove, the first annular groove is arranged around the outer peripheral wall of the base, the first communicating groove is connected with the first annular groove, the first communicating groove extends to the lower surface of the base, so that a part of the first welding material is located in the first communicating groove, and another part of the first welding material is located in the first annular groove, which can improve the sealing performance of the valve body and the valve seat after welding.

Description

Technical Field

[0001] The utility model relates to the technical field of fluid control, in particular to a control valve. Background Art

[0002] In refrigeration cycle devices, solenoid valves are usually used to achieve the full opening and closing functions of the fluid. Figure 1 The cross-sectional diagram of a solenoid valve is shown in the background technology. Figure 1 As shown, the solenoid valve includes a valve body 01, a valve seat 02, an inlet pipe 03, an outlet pipe 04 and a piston 05. The piston 05 moves to abut against or away from the valve seat 02 to realize the opening and closing of the solenoid valve. For the solenoid valve of this structure, the sealing performance (external leakage performance) of the valve body 01 and the valve seat 02 after assembly is required to be high. Therefore, how to improve the sealing performance between the two is a problem that technicians in this field should pay attention to. Utility Model Content

[0003] The utility model provides a control valve, including a valve body, a valve seat and a valve core, the valve body is tubular, the valve seat is at least partially located in the inner cavity of the valve body, the valve seat includes a valve mouth part and a base part, the valve mouth part is located above the base part, the valve core can be against the valve mouth part, the base part is cylindrical, the base part includes a first annular groove and a first connecting groove, the first annular groove is arranged around the outer peripheral wall of the base part, the first connecting groove is connected with the first annular groove, and the first connecting groove extends to the lower surface of the base part; the control valve also includes a first welding material, a part of the first welding material is located in the first connecting groove, and another part of the first welding material is located in the first annular groove, and the valve body is welded and fixed to the valve seat.

[0004] The control valve provided in the present application comprises a first annular groove and a first connecting groove at the base of the valve seat. The first annular groove is arranged around the outer peripheral wall of the base. The first connecting groove is connected to the first annular groove. The first connecting groove extends to the lower surface of the base, so that a part of the first welding material is located in the first connecting groove, and another part of the first welding material is located in the first annular groove, which can improve the sealing performance of the valve body and the valve seat after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Figure 1 : Background technology A cross-sectional schematic diagram of a solenoid valve;

[0006] Figure 2 : A cross-sectional schematic diagram of a control valve provided by the utility model;

[0007] Figure 3 : Figure 2 The enlarged schematic diagram of point A in the middle;

[0008] Figure 4: Figure 2 Assembly diagram of the middle valve body and valve seat in an inverted state before welding;

[0009] Figure 5 : Figure 2 A three-dimensional view of the middle valve seat;

[0010] Figure 6 : Figure 2 A three-dimensional diagram of the middle connector;

[0011] Figure 7 : A three-dimensional diagram of another valve seat provided by the utility model. DETAILED DESCRIPTION

[0012] In order to enable those skilled in the art to better understand the technical solution of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the drawings described below are only some embodiments of the utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work. Figure 2 The positions of the components shown in the figure are defined only for the clarity and convenience of expressing the technical solution. It should be understood that the directional words used in this article should not limit the scope of protection requested by this application.

[0013] Figure 2 A cross-sectional schematic diagram of a control valve provided by the utility model; Figure 3 for Figure 2 The enlarged schematic diagram of point A in the middle; Figure 4 for Figure 2 Assembly diagram of the middle valve body and valve seat in an inverted state before welding; Figure 5 for Figure 2 A three-dimensional view of the middle valve seat; Figure 6 for Figure 2 A three-dimensional view of the connecting piece.

[0014] As shown in the figure, the control valve of this embodiment is described by taking a solenoid valve as an example, and includes a valve body 1, a valve seat 2, a valve core 3, a sleeve 5, and a moving iron core component 6. The valve body 1 is in the shape of a round tube, formed by processing a metal pipe, and has an inner cavity 10. The sleeve 5 is formed by processing a stainless steel pipe, and the valve body 1 is welded and fixed to the sleeve 5. Under the action of the electromagnetic force, the moving iron core component 6 can move axially relative to the valve body 1, so that it can abut against or leave the pilot valve port 31 of the valve core 3.

[0015] The valve seat 2 is formed by metal powder metallurgy or metal injection molding, that is, the valve seat 2 is a powder metallurgy part or a metal injection part. The valve seat 2 is at least partially located in the inner cavity 10 of the valve body 1. The valve seat 2 specifically includes a valve mouth portion 221 and a base portion 21. The valve mouth portion 221 is located above the base portion 21. The valve mouth 2210 of the valve mouth portion 221 faces the valve core 3. The valve core 3 can abut against the valve mouth portion 221 to close the control valve. The base portion 21 is cylindrical, and the base portion 21 includes an outer peripheral wall 210 and a lower surface 213. The outer peripheral wall 210 is connected to the lower surface 213. The valve seat 2 and the valve body 1 are pressed together so that the outer peripheral wall 210 of the base portion 21 is tightly matched with the inner wall 11 of the valve body 1, and then the valve body 1 and the valve seat 2 are fixedly connected by furnace welding or the like.

[0016] The welding structure of the valve body 1 and the valve seat 2 will be described in detail below with reference to the accompanying drawings.

[0017] like Figure 2-Figure 5 As shown, the base 21 includes a first annular groove 211 and a first connecting groove 212. The first annular groove 211 and the first connecting groove 212 are inwardly recessed relative to the outer peripheral wall 210. The first annular groove 211 is arranged around the outer peripheral wall 210. The first annular groove 211 is connected to the first connecting groove 212, and the first connecting groove 212 extends to the lower surface 213 of the base 21.

[0018] This setting, combined with Figure 3-Figure 5 As shown, the first welding material W1 is a welding ring R before being heated and melted, which is placed on the lower surface 213 of the base 21. After being heated and melted, the first welding material W1 will flow to the first annular groove 211 through the first connecting groove 212 under the action of gravity and capillary action, so that after cooling, a part of the first welding material W1 is located in the first connecting groove 212, and another part of the first welding material W1 is located in the first annular groove 211. Since the first annular groove 211 is arranged in a full circle around the outer peripheral wall 210 of the base 21, after the first welding material W1 fills the first annular groove 211, it can improve the sealing performance of the valve body 1 and the valve seat 2, and reduce the leakage of the control valve product.

[0019] Furthermore, in order to improve the welding efficiency and enable the melted first welding material W1 to quickly reach the first annular groove 211, the first connecting groove 212 is extended along the axial direction of the valve body 1, so that the path from the lower surface 213 of the base 21 to the first annular groove 211 is the shortest, which accelerates the speed of the first welding material W1 reaching the first annular groove 211; at the same time, the number of the first connecting grooves 212 includes at least two, and the first connecting grooves 212 are symmetrically arranged relative to the center line L of the base 21. In this way, on the one hand, the speed of the first welding material W1 reaching the first annular groove 211 can be accelerated, and on the other hand, the symmetrical first connecting grooves 212 are arranged in the circumferential direction of the base 21, so that the first welding material W1 is filled evenly, thereby improving the welding quality. On the other hand, since a part of the first welding material W1 is located in the first connecting groove 212, more than two first connecting grooves 212 are arranged, and the contact area between the first welding material W1 and the inner wall 11 of the valve body 1 is increased, which is conducive to improving the welding strength between the valve body 1 and the valve seat 2.

[0020] As a further embodiment, Figure 2 , Figure 3 As shown, the lower surface 213 of the base 21 includes a conical surface 2131, and the lower end of the conical surface 2131 is closer to the center line L of the base 21 than the upper end of the conical surface 2131. Figure 2 , Figure 3 In the vertical direction of the drawing, the diameter of the conical surface 2131 decreases downward along the axial direction of the valve body 1. The conical surface 2131 is connected to the outer peripheral wall 210 of the base 21, and the lower port 2120 of the first connecting groove 212 is at least partially located on the conical surface 2131. Another part of the first welding material W1 covers the conical surface 2131.

[0021] In this setting, Figure 4 In the state shown, after the welding ring R is heated and melted, under the action of gravity and capillary force, the conical surface 2131 can act as a guide surface to guide the first welding material W1 to the first connecting groove 212, which is conducive to the solder to flow quickly to the first annular groove 211, thereby improving the welding efficiency.

[0022] like Figure 3 , Figure 5 As shown, the lower surface 213 of the base 21 also includes a plane 2132, which is arranged to extend radially along the valve body 1, and the plane 2132 is connected to the above-mentioned conical surface 2131. The valve seat 2 also includes a downward extending portion 23, which is located below the base 21, and the outer diameter of the downward extending portion 23 is smaller than the outer diameter of the base 21. The downward extending portion 23 and the base 21 form an annular step portion 24 with a downward step surface, and the step surface of the annular step portion 24 serves as the above-mentioned plane 2132. Figure 4As shown, by providing the annular step portion 24 , the welding ring R can be radially limited by simply putting the welding ring R onto the downward extending portion 23 . Limiting the welding ring R can improve the welding quality between the valve body 1 and the valve seat 2 .

[0023] Further, such as Figure 3 As shown, the lower end surface 12 of the valve body 1 is lower than the above-mentioned plane 2132, and an annular accommodating cavity Q ( Figure 4 As shown in the figure, the welding ring R is placed in the annular accommodating cavity Q before welding. With such a configuration, the first welding material W1 can be prevented from overflowing during welding, ensuring that there is enough first welding material W1 flowing to the first annular groove 211, thereby reducing welding defects such as lack of welding and pores. In addition, another part of the first welding material W1 covers the plane 2132. With such a configuration, after the valve body 1 and the valve seat 2 are welded, the quality of welding can be judged by observing the amount of the first welding material W1 covered on the plane 2132, that is, whether the amount of solder is sufficient.

[0024] As a further technical solution, Figure 2 , Figure 5 As shown, the valve seat 2 includes a flow channel portion 22, which is located above the base 21. The flow channel portion 22 includes the valve port portion 221 and a matching wall 222, which is formed by extending upward from the outer peripheral wall 210 of the base 21, and includes a fluid outlet 220. The flow channel portion 22 includes a second annular groove 223, which is arranged around the fluid outlet 220, and the second welding material W2 is at least partially located in the second annular groove 223. Since the matching wall 222 is in a curved surface shape, it is not suitable to place an ordinary welding ring in the second annular groove 223 before welding. Therefore, in this embodiment, the second welding material W2 is solder paste, which is filled in the second annular groove 223 by coating. Its beneficial effect is that, on the one hand, the internal leakage performance of the control valve is improved, that is, when the control valve is closed, the fluid flowing into the inlet pipe X will not leak to the fluid outlet 220; on the other hand, the welding strength between the valve seat 2 and the valve body 1 is strengthened.

[0025] like Figure 2 , Figure 6As shown, further, the control valve of this embodiment also includes a connector 4 and an outlet pipe Y. The valve body 1 has a side hole 13, and the side hole 13 is connected to the fluid outlet 220. The connector 4 is made by stamping a metal sheet, and includes a connecting portion 41 and an interface portion 42. The connecting portion 41 is arranged around the side hole 13. The connecting portion 41 has a connecting surface 411 that matches the outer wall of the valve body 1. The connecting surface 411 is saddle-shaped. The connecting portion 41 is welded and fixed to the valve body 1. The interface portion 42 is sleeved on the outlet pipe Y, and the interface portion 42 is welded and fixed to the outlet pipe Y. By providing the connector 4, the valve body 1 is connected to the outlet pipe Y. The connection is simple, and the leakage performance of the control valve is easily guaranteed. Correspondingly, as shown in Figure 2 As shown, the valve body 1 is connected to the inlet pipe X via another connecting piece 4 .

[0026] Figure 7 A three-dimensional diagram of another valve seat provided by the utility model.

[0027] like Figure 7 As shown, the difference between this embodiment and the above embodiment lies in the setting of the second connecting groove. Specifically, the valve seat 2A includes a flow channel portion 22A, the flow channel portion 22A is located above the base 21, the flow channel portion 22A includes the valve port portion 221 and a matching wall 222A, the matching wall 222A is formed by extending upward from the outer peripheral wall 210 of the base 21, the matching wall 222A includes a fluid outlet 220, the flow channel portion 22A includes a second annular groove 223, the second annular groove 223 is arranged around the fluid outlet 220, and the valve seat 2A includes a second connecting groove 214A, the second connecting groove 214A connects the above first annular groove 211 and the second annular groove 223. Another part of the first welding material W1 is located in the second connecting groove 214A and the second annular groove 223. That is, by providing the second connecting groove 214A, the first annular groove 211 is connected to the second annular groove 223 , and the first welding material W1 can flow to the second annular groove 223 , thereby eliminating the process of applying solder paste and further improving welding efficiency.

[0028] Furthermore, the second connecting groove 214A is extended along the axial direction of the valve body 1, and the second connecting groove 214A is connected to the lowest point of the second annular groove 223 in the axial direction of the valve body 1. This arrangement makes the solder flow path between the first annular groove 211 and the second annular groove 223 as short as possible, which can increase the speed of the solder flowing to the second annular groove 223.

[0029] Of course, it is conceivable that in order to increase the speed at which the solder flows to the second annular groove 223 in a molten state, the number of the second connecting grooves 214A may be set to be more than two.

[0030] like Figure 5 , Figure 7As shown, the number of the first annular groove 211 is 1. As a variation, in order to improve the sealing performance after the valve body 1 and the valve seat 2 are welded, the number of the first annular grooves 211 can be set to more than 2, and the two adjacent first annular grooves 211 are connected by setting a connecting groove.

[0031] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described 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.

[0032] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and controls can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A control valve, comprising a valve body, a valve seat and a valve core, characterized in that: The valve body is tubular, the valve seat is at least partially located in the inner cavity of the valve body, the valve seat includes a valve mouth and a base, the valve mouth is located above the base, the valve core can be against the valve mouth, the base is cylindrical, the base includes a first annular groove and a first connecting groove, the first annular groove is arranged around the outer peripheral wall of the base, the first connecting groove is connected with the first annular groove, and the first connecting groove extends to the lower surface of the base; The control valve further includes a first welding material, a portion of the first welding material is located in the first communicating groove, another portion of the first welding material is located in the first annular groove, and the valve body is fixed to the valve seat by welding.

2. The control valve according to claim 1, characterized in that: The lower surface of the base includes a conical surface, the lower end of the conical surface is closer to the center line of the base than the upper end of the conical surface, the conical surface is connected to the outer peripheral wall of the base, the lower port of the first connecting groove is at least partially located on the conical surface, and another part of the first welding material covers the conical surface.

3. The control valve according to claim 2, characterized in that: The lower surface of the base includes a plane, which is extended radially along the valve body and connected to the conical surface. The valve seat also includes a downward extending portion, which is located below the base. The outer diameter of the downward extending portion is smaller than the outer diameter of the base. The downward extending portion and the base form an annular step portion with the step surface facing downward, and the step surface of the annular step portion serves as the plane.

4. The control valve according to claim 3, characterized in that: The lower end surface of the valve body is lower than the plane, an annular accommodating cavity is defined between the inner wall of the valve body and the step wall of the annular step portion, and another portion of the first welding material covers the plane.

5. The control valve according to claim 1, characterized in that: The first communicating groove is extended along the axial direction of the valve body, the number of the first communicating grooves is at least two, and the first communicating grooves are symmetrically arranged relative to the center line of the base.

6. The control valve according to any one of claims 1 to 5, characterized in that: The valve seat includes a flow channel portion, which is located above the base. The flow channel portion includes the valve mouth portion and a matching wall, which is formed by extending upward from the outer peripheral wall of the base. The matching wall includes a fluid outlet, and the flow channel portion includes a second annular groove, which is arranged around the fluid outlet. The control valve also includes a second welding material, which is at least partially located in the second annular groove.

7. The control valve according to any one of claims 1 to 5, characterized in that: The valve seat includes a flow channel portion, which is located above the base. The flow channel portion includes the valve mouth portion and a matching wall, which is formed by extending upward from the outer peripheral wall of the base. The matching wall includes a fluid outlet. The flow channel portion includes a second annular groove, which is arranged around the fluid outlet. The valve seat includes a second connecting groove, which connects the first annular groove with the second annular groove. Another part of the first welding material is located in the second connecting groove and the second annular groove.

8. The control valve according to claim 7, characterized in that: The second communicating groove is extended along the axial direction of the valve body. In the axial direction of the valve body, the second communicating groove is connected to the lowest point of the second annular groove.

9. The control valve according to claim 6, characterized in that: It also includes a connecting piece and an outlet pipe, the valve body has a side hole, the side hole is connected to the fluid outlet, the connecting piece includes a connecting part and an interface part, the connecting part is arranged around the side hole, the connecting part has a connecting surface that matches the outer wall of the valve body, the connecting surface is saddle-shaped, the connecting part is welded and fixed to the valve body, and the interface part is welded and fixed to the outlet pipe.

10. The control valve according to claim 1, characterized in that The valve seat is formed by metal powder metallurgy or metal injection molding, and the outer peripheral wall of the base is tightly matched with the inner wall of the valve body.

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