Switching valve

Abstract

The utility model provides a switching valve which comprises a valve body, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod, a valve rod and a valve rod, and the valve rod is provided with a valve cavity and a mounting hole; the valve seat is arranged in the valve cavity and located at the mounting hole, a plurality of protruding parts are arranged on the side, facing the mounting hole, of the valve seat, a circulation channel is formed in each protruding part in a penetrating mode, the circulation channels communicate with the valve cavity, a containing area is formed among the peripheries of the protruding parts, the surface of the valve seat and the side wall of the mounting hole, and the containing area is used for containing overflowing welding flux. By means of the technical scheme, the problem that in the prior art, when the valve seat and the valve body are assembled, welding flux is prone to flowing out can be solved.

Description

Technical Field

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

[0002] A switching valve is a control valve with multiple connection ports, usually composed of a valve body, a valve core, a valve seat and multiple connecting pipes. It changes the switching, mixing and diversion of fluids between multiple connecting pipes by rotating or moving the valve core, thereby changing the flow direction and flow distribution of the fluid. It is an indispensable component in refrigeration equipment.

[0003] At present, when the switching valve is assembled, the valve seat and the valve body are usually installed with a tight fit, which makes the gap between the valve seat and the valve body mounting hole too small to accommodate the outflowing solder, resulting in serious outflow of solder at the root of the pipe, and the melted solder will overflow to the outer surface of the valve body and damage it. Utility Model Content

[0004] The utility model provides a switching valve to solve the problem that solder easily flows out when assembling a valve seat and a valve body in the prior art.

[0005] According to the utility model, a switching valve is provided, comprising: a valve body, the valve body having a valve cavity and a mounting hole, the valve cavity being connected to the mounting hole; a valve seat, arranged in the valve cavity, the valve seat being located at the mounting hole, a plurality of protrusions being arranged on one side of the valve seat facing the mounting hole, each protrusion being provided with a flow channel, the flow channel being connected to the valve cavity, a receiving area being formed between the periphery of the protrusion, the surface of the valve seat and the side wall of the mounting hole, the receiving area being used to receive overflow solder. Through the above arrangement, the situation that the outflow of solder causes corrosion to the valve body is avoided, and the welding strength is ensured, thereby improving the stability of the connection between the valve seat and the valve body.

[0006] Furthermore, the end of each protrusion extends from the mounting hole to the outside of the valve body. Through the above arrangement, the length of the end of the protrusion is extended, that is, the contact area between the protrusion and the pipe is increased, making the connection between the pipe and the protrusion more secure and stable.

[0007] Furthermore, the inner side of the end of the protrusion away from the valve cavity has a chamfered structure. Through the above arrangement, the connecting pipe can be guided so that the connecting pipe can enter the flow channel more smoothly through the chamfered structure, greatly reducing the generation of burrs.

[0008] Furthermore, the gap between the outer wall of the protrusion and the inner wall of the mounting hole is in the range of 0.2 mm to 0.8 mm. Through the above arrangement, sufficient space can be ensured to accommodate the outflowing solder, and the normal assembly of the valve seat and valve body can be ensured.

[0009] Furthermore, the thickness of the valve body side wall is t, and the distance between the end surface of the protrusion away from the valve cavity and the outer surface of the mounting hole is in the range of 0.5mm to 3t. Through the above arrangement, the structural strength of the protrusion can be ensured, and the valve seat can be assembled smoothly.

[0010] Furthermore, the switching valve also includes a connecting pipe, which is connected to the circulation channel, and the connecting pipe and the circulation channel are interference-fitted. Through the above arrangement, the center distance error during the connecting pipe assembly is reduced, thereby avoiding the situation of adhesion between copper sleeves.

[0011] Furthermore, the interference between the connecting pipe and the circulation channel is between 0 and 0.05 mm. Through the above arrangement, the assembly effect of the connecting pipe and the circulation channel is better, which is convenient for the assembly of the connecting pipe.

[0012] Furthermore, the mounting hole extends along the length direction of the valve body, the length of the mounting hole is L1, the maximum interval between the head end raised portion and the terminal raised portion is L2, wherein 0.4mm≤L1-L2≤1.6mm. The above arrangement facilitates the installation of the valve seat in the mounting hole, and ensures that there is a gap between the outer edge of the entire raised portion formed by the head section raised portion to the terminal raised portion and the inner wall of the mounting hole to accommodate the outflowing solder.

[0013] Furthermore, the surface of the valve seat close to the mounting hole is matched and fitted with the inner wall of the valve cavity. Through the above arrangement, the contact area between the valve seat and the valve body is increased, thereby increasing the mounting strength of the valve seat and the valve body.

[0014] Furthermore, an annular boss is provided on the inner wall of one end of the circulation channel close to the valve cavity, and the annular boss is provided along the periphery of the circulation channel. Through the above arrangement, it is convenient to place a welding ring to weld the connection between the pipe and the circulation channel, and the annular boss can limit the pipe in the axial direction.

[0015] By applying the technical solution of the utility model, a plurality of protrusions are provided on the side of the valve seat facing the mounting hole, and a flow channel is provided through each protrusion, which is connected to the valve cavity. A receiving area is formed between the periphery of the protrusion, the surface of the valve seat and the side wall of the mounting hole, and the receiving area is used to receive the overflowed solder. This arrangement can prevent the melted solder from overflowing to the outer surface of the valve body. Through the above structure, the present application forms a receiving area between the periphery of the protrusion, the surface of the valve seat and the side wall of the mounting hole, so that the overflowed solder can be received by the receiving area, thereby preventing the solder from flowing out and corroding the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 A schematic diagram of assembling a valve body and a valve seat according to an embodiment of the utility model is shown;

[0018] Figure 2 A top view of a valve body provided according to an embodiment of the utility model is shown;

[0019] Figure 3 A cross-sectional view of a valve seat provided according to an embodiment of the utility model is shown;

[0020] Figure 4 A schematic diagram of assembling a connecting pipe and a valve seat according to an embodiment of the utility model is shown;

[0021] Figure 5 An assembly diagram of a switching valve provided according to an embodiment of the utility model is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Valve body; 11. Valve cavity; 12. Mounting hole;

[0024] 20. valve seat; 21. raised portion; 211. flow channel; 2111. chamfered structure; 22. flow blocking groove; 23. annular boss;

[0025] 30. Take over. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0027] like Figures 1 to 3As shown, an embodiment of the utility model provides a switching valve, including: a valve body 10 and a valve seat 20. The valve body 10 has a valve cavity 11 and a mounting hole 12, and the valve cavity 11 is connected to the mounting hole 12. The valve seat 20 is arranged in the valve cavity 11, and the valve seat 20 is located at the mounting hole 12. A plurality of protrusions 21 are arranged on the side of the valve seat 20 facing the mounting hole 12, and a circulation channel 211 is arranged through each protrusion 21, and the circulation channel 211 is connected to the valve cavity 11 to facilitate the circulation of the fluid. A receiving area is formed between the outer periphery of the protrusion 21, the surface of the valve seat 20 and the side wall of the mounting hole 12, and the receiving area is used to receive the overflow solder to prevent the solder from overflowing to the outer wall of the valve body 10 after melting.

[0028] According to the technical solution of the utility model, a plurality of protrusions 21 are provided on the side of the valve seat facing the mounting hole, and a flow channel 211 is provided through each protrusion 21, which is connected to the valve cavity 11. A receiving area is formed between the outer periphery of the protrusion 21, the surface of the valve seat 20 and the side wall of the mounting hole 12, and the receiving area is used to receive the overflowed solder. In the prior art, the excess solder will overflow during the welding of the pipe and the valve seat, and the welding of the valve seat and the valve body. In the present application, the setting of the receiving area can prevent the melted solder from overflowing to the outer surface of the valve body. In the present application, the receiving area is formed between the outer periphery of the protrusion 21, the surface of the valve seat 20 and the side wall of the mounting hole 12 through the above structure, so that the outflow of solder is prevented from corroding the valve body 10, and the melting of the solder in the receiving area also ensures that there is enough solder for welding at the welding point, thereby ensuring the welding strength of the welding point between the valve seat 20 and the valve body 10, thereby improving the stability of the connection between the valve seat 20 and the valve body 10.

[0029] In the present application, the specific shape of the mounting hole 12 is not limited, and it can be assembled with the valve seat 20, and can be set to a waist-shaped hole, a square hole, etc. Preferably, the mounting hole 12 is set to a waist-shaped hole, and the valve body 10 can be processed to open the mounting hole 12 by laser cutting, punching, etc. The valve seat 20 can be processed by stamping, machining, or powder metallurgy.

[0030] Furthermore, the end of each protrusion 21 extends from the mounting hole 12 to the outside of the valve body 10. This arrangement facilitates the positioning of the valve seat 20 and prevents the valve seat 20 from being easily displaced in the mounting hole 12 during assembly, which causes installation difficulties. In the present application, the end of the protrusion 21 is extended to the outside of the valve body 10, and the length of the end of the protrusion 21 is extended, that is, the contact area between the protrusion 21 and the connecting pipe 30 is increased, so that the connection between the connecting pipe 30 and the protrusion 21 is more tight and stable, thereby improving the connection strength between the valve seat 20 and the connecting pipe 30. This facilitates the positioning of the valve seat 20 and prevents the valve seat 20 from being easily displaced in the mounting hole 12 during assembly, which causes installation difficulties.

[0031] Specifically, the inner side of the end of the protrusion 21 away from the valve cavity 11 has a chamfered structure 2111. In the prior art, when the pipe is assembled, due to the tight fit requirements and material hardness issues, the root of the pipe is very easy to be scratched with burrs when assembled with the valve seat, thereby causing poor welding. However, the present application provides a chamfered structure 2111, and when the pipe 30 and the circulation channel 211 are assembled, the chamfered structure 2111 can guide the pipe 30, and also form a transition section before entering the circulation channel 211, so that the pipe 30 can enter the circulation channel 211 more smoothly through the chamfered structure 2111, greatly reducing the generation of burrs. The specific size of the chamfered structure 2111 is not limited. Preferably, the chamfer can be set to C0.5mm. And the end of the circulation channel 211 away from the valve cavity 11 can be a plane, or it can be processed into a curved surface. Preferably, it is set to a plane, which is convenient for the processing of the chamfered structure 2111 and the access of the pipe 30.

[0032] Among them, the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 is in the range of 0.2mm to 0.8mm. If the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 is set to be less than 0.2mm, the distance between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 is too small, that is, it is impossible to form a sufficiently large area to accommodate the solder that overflows after melting when the valve seat 20 is welded to the valve body 10 and the connecting pipe 30 is welded to the valve seat 20. If the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 is set to be greater than 0.8mm, the gap will be too large, so it is difficult to determine and adjust the assembly position of the valve seat 20 during assembly, which will increase the difficulty of assembling the valve seat 20 and the valve body 10. In the present application, the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 can be set between 0.2mm and 0.8mm, which can not only ensure sufficient space to accommodate the outflowing solder, but also ensure the normal assembly of the valve seat 20 and the valve body 10. Specifically, the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 may be 0.2 mm, 0.5 mm, 0.7 mm or 0.8 mm.

[0033] like Figure 5As shown, in this embodiment, the thickness of the side wall of the valve body is t, and the distance between the end surface of the end of the protrusion 21 away from the valve cavity 11 and the outer surface of the mounting hole 12 is in the range of 0.5mm to 3t. If the distance between the end surface of the end of the protrusion 21 away from the valve cavity 11 and the outer surface of the mounting hole 12 is less than 0.5mm, it will cause the chamfer structure 2111 to extend into the inside of the valve body 10 after the chamfer structure 2111 is processed at the end of the protrusion 21, which will reduce the strength of the protrusion 21. If the distance between the end surface of the end of the protrusion 21 away from the valve cavity 11 and the outer surface of the mounting hole 12 is greater than three times the wall thickness of the valve body 10, the length of the protrusion 21 will be too long, which will not only cause waste of materials and solder, but also cause the valve seat 20 to be unable to be smoothly placed in the valve body 10, increasing the difficulty of assembling the valve seat 20 and the valve body 10. In the present application, the distance between the end surface of the protrusion 21 away from the valve cavity 11 and the outer surface of the mounting hole 12 is between 0.5 mm and 3 t, which can ensure the structural strength of the protrusion 21 and facilitate the assembly of the valve seat 20. In the prior art, the thickness t of the valve body side wall is generally between 0.8 mm and 2 mm. Specifically, the distance between the end surface of the protrusion 21 away from the valve cavity 11 and the outer surface of the mounting hole 12 can be 0.5 mm, 2.4 mm or 6 mm.

[0034] like Figure 4 As shown, the switching valve also includes a connecting pipe 30, which is connected to the circulation channel 211, and the connecting pipe 30 and the circulation channel 211 are interference fit. The connecting pipe 30 is arranged inside the valve seat 20 to avoid direct contact between the connecting pipe 30 and the valve body 10. In the prior art, when the connecting pipe is matched, the main valve seat, the connecting pipe, and the main valve body hole are matched together. The three have tolerances, and deflection will occur when matched, resulting in a small gap between the copper sleeves at the end of the connecting pipe. When welding, the connecting pipe is inserted into the copper sleeve, and then welded with a welding wire close to the matching gap. When welding on two short connecting pipes, the welding wire will cause the upper end of the short tube copper sleeve to adhere to the lower end of the long tube copper sleeve due to the close distance between the copper sleeves. In the present application, the connecting pipe 30 is tightly fitted on the raised portion 21 of the valve seat 20, and because the raised portion 21 protrudes from the valve body 10, the matching length of the connecting pipe 30 and the raised portion 21 is long, and the parallelism between multiple connecting pipes 30 is better. Furthermore, by connecting the connecting pipe 30 inside the circulation channel 211, the connecting pipe 30 only needs to be welded to the valve seat 20 during assembly, and there is no need to match the center distance of the mounting hole 12 on the valve body 10 for assembly, thereby reducing the center distance error of the connecting pipe 30 during assembly, avoiding the connecting pipes 30 from tilting and approaching each other, and further avoiding the situation where the copper sleeves of different connecting pipes 30 are adhered to each other.

[0035] Specifically, when the pipe 30 and the flow channel 211 are welded, the welding method is not limited, and a welding ring may be placed at the bottom of the valve seat 20, that is, at the root of the pipe 30 for welding. Alternatively, a welding ring may be placed on the end of the flow channel 211 away from the valve body 10 or solder paste may be applied, and then welding may be performed by furnace brazing or the like.

[0036] Specifically, the interference between the connecting pipe 30 and the circulation channel 211 is between 0 and 0.05 mm. Specifically, when the interference is within the range of 0 mm to 0.05 mm, the assembly effect of the connecting pipe 30 and the circulation channel 211 is better, and the assembly of the connecting pipe 30 is convenient. If the interference is too large, it will lead to assembly difficulties and extended assembly time.

[0037] The mounting hole 12 extends along the length direction of the valve body 10, the length of the mounting hole 12 is L1, and the maximum interval between the head end protrusion and the terminal end protrusion is L2, wherein 0.4mm≤L1-L2≤1.6mm. The above arrangement facilitates the installation of the valve seat 20 in the mounting hole 12, and the outer edge of the protrusion 21 formed by the head end protrusion to the terminal end protrusion has a gap from the inner wall of the mounting hole 12 to accommodate the outflowing solder. If L1-L2 is less than 0.4mm, the mounting hole 12 and the valve body 10 cannot form a large enough area to accommodate the overflowing solder. If L1-L2 is greater than 1.6mm, this will increase the difficulty of assembling the valve body 10 with the mounting hole 12. Therefore, in the present application, L1-L2 is set between 0.4mm and 1.6mm, which can not only ensure sufficient space to accommodate the outflowing solder, but also ensure the normal assembly between the valve body 10 and the mounting hole 12. In the present application, there is no limitation on whether L1-L2 and the gap between the outer wall of the protrusion 21 and the inner wall of the mounting hole 12 are equal. Specifically, L1-L2 can be 0.4mm, 0.8mm, 1.2mm or 1.6mm, which can form enough space to accommodate the solder flowing out.

[0038] In this embodiment, the mounting hole 12 is a waist-shaped hole, which includes two arc segments and a straight segment. The two arc segments are respectively located at the two ends of the straight segment. The distance from the center of the head end protrusion to the center of the end end protrusion is equal to the length of the straight segment, and the outer wall dimensions of the head end protrusion and the end end protrusion are adapted to the diameters of the two arc segments.

[0039] like Figure 5As shown, the surface of the valve seat 20 near the mounting hole 12 is matched with the inner wall of the valve cavity 11. This arrangement increases the contact area between the valve seat 20 and the valve body 10, thereby increasing the installation strength of the valve seat 20 and the valve body 10, and facilitates assembly. There are flow blocking grooves 22 on both sides of the surface of the valve seat 20 near the mounting hole 12, which are used to prevent the solder at the welding point of the valve seat 20 and the connecting pipe 30 from melting and flowing to the inner wall of the valve body 10, causing corrosion to the inner wall of the valve body 10.

[0040] like Figure 3 As shown, an annular boss 23 is provided on the inner wall of one end of the circulation channel 211 close to the valve cavity 11, and the annular boss 23 is provided along the periphery of the circulation channel 211. The provision of the annular boss 23 facilitates the placement of a welding ring to weld the connection between the pipe 30 and the circulation channel 211, and the annular boss 23 can limit the position of the pipe 30 in the axial direction, facilitating the docking of the assembly position of the pipe 30 and the circulation channel 211 and subsequent welding operations.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0042] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0044] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0045] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A switching valve, characterized in that: The switching valve comprises: A valve body (10), the valve body having a valve cavity (11) and a mounting hole (12), the valve cavity (11) being in communication with the mounting hole (12); A valve seat (20) is arranged in the valve cavity (11), and the valve seat (20) is located at the mounting hole (12). A plurality of protrusions (21) are arranged on the side of the valve seat (20) facing the mounting hole (12), and a flow channel (211) is penetrated through each of the protrusions (21), and the flow channel (211) is connected to the valve cavity (11). An accommodating area is formed between the outer periphery of the protrusion (21), the surface of the valve seat (20) and the side wall of the mounting hole (12), and the accommodating area is used to accommodate overflowed solder.

2. The switching valve according to claim 1, characterized in that: An end portion of each protrusion (21) extends from the mounting hole (12) to the outside of the valve body (10).

3. The switching valve according to claim 1, characterized in that: The inner side of the end of the protruding portion (21) away from the valve cavity (11) has a chamfered structure (2111).

4. The switching valve according to claim 1, characterized in that: The gap between the outer wall of the protruding portion (21) and the inner wall of the mounting hole (12) is in the range of 0.2 mm to 0.8 mm.

5. The switching valve according to claim 1, characterized in that: The thickness of the side wall of the valve body (10) is t, and the distance between the end surface of the protrusion (21) away from the valve cavity (11) and the outer surface of the mounting hole (12) is in the range of 0.5 mm to 3t.

6. The switching valve according to claim 1, characterized in that: The switching valve further comprises a connecting pipe (30), wherein the connecting pipe (30) is connected to the circulation channel (211), and the connecting pipe (30) and the circulation channel (211) are interference fit.

7. The switching valve according to claim 6, characterized in that: The interference fit between the connecting pipe (30) and the circulation channel (211) is between 0 and 0.05 mm.

8. The switching valve according to claim 1, characterized in that: The mounting hole (12) extends along the length direction of the valve body (10), the length of the mounting hole (12) is L1, and the maximum interval between the protrusion (21) at the head end and the protrusion (21) at the tail end is L2, wherein 0.4 mm ≤ L1-L2 ≤ 1.6 mm.

9. The switching valve according to claim 1, characterized in that: The surface of the valve seat (20) on the side close to the mounting hole (12) is adapted to fit the inner wall of the valve cavity (11).

10. The switching valve according to claim 1, characterized in that: An annular boss (23) is provided on the inner wall of one end of the circulation channel (211) close to the valve cavity (11), and the annular boss (23) is provided along the periphery of the circulation channel (211).

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