Switching valve

Abstract

A switching valve. The switching valve comprises: a valve body (10), wherein a valve cavity (11) and a mounting hole (12) are formed in the valve body, and the valve cavity is communicated with the mounting hole; and a valve seat (20), provided in the valve cavity, wherein the valve seat is located at the mounting hole, the side of the valve seat facing the mounting hole is provided with a plurality of protruding portions (21), a flow channel (211) is formed in each protruding portion in a penetrating mode, the flow channel is communicated with the valve cavity, an accommodating area is formed between the periphery of the protruding portion, the surface of the valve seat and the sidewall of the mounting hole, and the accommodating area is used for accommodating overflowed solder. The switching valve can solve the problem in the prior art that the solder easily overflows when a valve seat and a valve body are assembled.

Description

Switching valve

[0001] This application claims priority to the patent application entitled “Switching Valve” filed with the State Intellectual Property Office of China on January 23, 2024, with application number 202420166093.4. Technical Field

[0002] The present application relates to the technical field of control valves, and in particular to a switching valve. Background Art

[0003] A switching valve is a control valve with multiple connection ports. It is 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 fluid flow direction and flow distribution. It is an indispensable component in refrigeration equipment.

[0004] Currently, when assembling a switching valve, the valve seat and valve body are usually installed with a tight fit. This will make 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. The melted solder will overflow to the outer surface of the valve body and damage it. Summary of the Invention

[0005] The present application provides a switching valve to solve the problem in the prior art that solder easily flows out when assembling a valve seat and a valve body.

[0006] The present application provides a switching valve, comprising: a valve body having a valve cavity and a mounting hole, the valve cavity communicating with the mounting hole; a valve seat disposed within the valve cavity, the valve seat being located at the mounting hole, a plurality of raised portions disposed on a side of the valve seat facing the mounting hole, each of the raised portions having a flow channel extending therethrough, the flow channel communicating with the valve cavity, and a receiving area formed between the outer periphery of the raised portions, the surface of the valve seat, and the sidewall of the mounting hole, the receiving area being used to accommodate overflowing solder. This arrangement prevents corrosion of the valve body caused by outflowing solder, ensures welding strength, and thereby improves the stability of the connection between the valve seat and the valve body.

[0007] 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.

[0008] 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 enters the flow channel more smoothly through the chamfered structure, greatly reducing the generation of burrs.

[0009] 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 guaranteed to accommodate the outflowing solder, and normal assembly of the valve seat and valve body can be guaranteed.

[0010] 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 while the valve seat can be assembled smoothly.

[0011] Furthermore, the switching valve further comprises a connecting pipe connected to the circulation channel, and the connecting pipe and the circulation channel have an interference fit. Through the above arrangement, the center distance error during the connecting pipe assembly is reduced, thereby avoiding the situation where the copper sleeves are stuck.

[0012] Furthermore, the interference between the connecting pipe and the circulation channel is between 0 and 0.05 mm. Through the above arrangement, the connecting pipe and the circulation channel have a better assembly effect, which is convenient for the assembly of the connecting pipe.

[0013] Furthermore, the mounting hole extends along the length of the valve body, with a length of L1. The raised portion has a head end and a tail end positioned opposite each other along the length of the valve body, with a maximum spacing of L2, where 0.4 mm ≤ L1 - L2 ≤ 1.6 mm. This arrangement facilitates installation of the valve seat within the mounting hole, and ensures that the outer edge of the raised portion, formed from the first to the tail end, has a clearance from the inner wall of the mounting hole to accommodate any solder flow.

[0014] Furthermore, the surface of the valve seat near the mounting hole is adapted to fit 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.

[0015] Furthermore, an annular boss is provided on the inner wall of the circulation channel at one end near the valve cavity, and the annular boss is provided along the circumference of the circulation channel. This arrangement facilitates the placement of a welding ring for welding the connection between the pipe and the circulation channel, and the annular boss can also limit the position of the pipe in the axial direction.

[0016] Using the technical solution of the present application, a plurality of raised portions are provided on the side of the valve seat facing the mounting hole. A flow channel is provided through each raised portion, which communicates with the valve cavity. A receiving area is formed between the outer periphery of the raised portion, the surface of the valve seat, and the sidewall of the mounting hole. The receiving area is used to accommodate overflowing solder. This arrangement can prevent melted solder from overflowing onto the outer surface of the valve body. Through the above structure, the present application forms a receiving area between the outer periphery of the raised portion, the surface of the valve seat, and the sidewall of the mounting hole. This area can be used to accommodate overflowing solder, preventing solder from flowing out and causing corrosion to the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings that constitute part of this application are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation on this application. In the drawings:

[0018] FIG1 shows a schematic diagram of the assembly of a valve body and a valve seat according to an embodiment of the present application;

[0019] FIG2 shows a top view of a valve body provided according to an embodiment of the present application;

[0020] FIG3 shows a cross-sectional view of a valve seat provided according to an embodiment of the present application;

[0021] FIG4 shows a schematic diagram of the assembly of a connecting pipe and a valve seat according to an embodiment of the present application;

[0022] FIG5 shows an assembly diagram of a switching valve provided according to an embodiment of the present application.

[0023] Among them, the above drawings include the following figure marks: 10, valve body; 11, valve cavity; 12, mounting hole; 20, valve seat; 21, raised portion; 211, flow channel; 2111, chamfered structure; 22, flow blocking groove; 23, annular boss; 30, connecting pipe. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] As shown in Figures 1 to 3, an embodiment of the present application provides a switching valve, comprising: 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 provided on the side of the valve seat 20 facing the mounting hole 12, and a circulation channel 211 is provided through each protrusion 21. The circulation channel 211 is connected to the valve cavity 11 to facilitate the circulation of the fluid. A 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. The accommodating area is used to accommodate overflow solder to prevent the solder from overflowing to the outer wall of the valve body 10 after melting.

[0026] Using the technical solution of the present application, a plurality of raised portions 21 are provided on the side of the valve seat facing the mounting hole. Each raised portion 21 is provided with a flow channel 211 extending therethrough, communicating with the valve cavity 11. A receiving area is formed between the outer periphery of the raised portion 21, the surface of the valve seat 20, and the sidewalls of the mounting hole 12. The receiving area is used to accommodate excess solder. In the prior art, excess solder can overflow during the welding of the connecting pipe to the valve seat and the welding of the valve seat to the valve body. In the present application, the provision of the receiving area prevents melted solder from overflowing onto the outer surface of the valve body. Through the above-mentioned structure, the present application forms a receiving area between the outer periphery of the raised portion 21, the surface of the valve seat 20, and the sidewalls of the mounting hole 12. This prevents solder from flowing out and corroding the valve body 10. The solder melted in the receiving area also ensures that there is sufficient solder at the weld, thereby ensuring the weld strength between the valve seat 20 and the valve body 10 and thereby improving the stability of the connection between the valve seat 20 and the valve body 10.

[0027] In this application, the specific shape of the mounting hole 12 is not limited. It can be configured to assemble with the valve seat 20 and can be configured in a shape such as a waist-shaped hole or a square hole. Preferably, the mounting hole 12 is configured as a waist-shaped hole, and the mounting hole 12 can be formed in the valve body 10 using methods such as laser cutting or a punching machine. The valve seat 20 can be formed by stamping, machining, or powder metallurgy.

[0028] 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 may cause installation difficulties. In the present application, the end of the protrusion 21 is extended to the outside of the valve body 10, thereby extending the length of the end of the protrusion 21, that is, increasing the contact area between the protrusion 21 and the connecting pipe 30, making the connection between the connecting pipe 30 and the protrusion 21 more secure 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 may cause installation difficulties.

[0029] 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 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. The end of the circulation channel 211 away from the valve cavity 11 can be a plane or a curved surface. Preferably, it is set to a plane, which facilitates the processing of the chamfered structure 2111 and the access of the pipe 30.

[0030] The gap between the outer wall of the raised portion 21 and the inner wall of the mounting hole 12 is within a range of 0.2 mm to 0.8 mm. If the gap between the outer wall of the raised portion 21 and the inner wall of the mounting hole 12 is set to less than 0.2 mm, the distance between the outer wall of the raised portion 21 and the inner wall of the mounting hole 12 is too small, i.e., a sufficient area cannot be formed to accommodate the solder that overflows after melting during the welding of the valve seat 20 to the valve body 10 and the welding of the connecting pipe 30 to the valve seat 20. If the gap between the outer wall of the raised portion 21 and the inner wall of the mounting hole 12 is set to greater than 0.8 mm, the gap is too large, making it difficult to determine and adjust the assembly position of the valve seat 20 during assembly, which increases 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 raised portion 21 and the inner wall of the mounting hole 12 can be set between 0.2 mm and 0.8 mm, which ensures sufficient space to accommodate the overflowing solder and ensures 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.

[0031] As shown in Figure 5, in this embodiment, the thickness of the valve body sidewall is t, and the distance between the end surface of the protrusion 21 at the end 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. If the distance between the end surface of the protrusion 21 at the end away from the valve cavity 11 and the outer surface of the mounting hole 12 is less than 0.5 mm, the chamfered structure 2111 formed on the end of the protrusion 21 may extend into the interior of the valve body 10, thereby reducing the strength of the protrusion 21. If the distance between the end surface of the protrusion 21 at the end 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 protrusion 21 will be too long, resulting in a waste of material and solder and preventing the valve seat 20 from being smoothly inserted into 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, which is remote from the valve cavity 11, and the outer surface of the mounting hole 12 is between 0.5 mm and 3 mm. This ensures the structural strength of the protrusion 21 while facilitating smooth assembly of the valve seat 20. In the prior art, the thickness t of the valve body sidewall is generally between 0.8 mm and 2 mm. Specifically, the distance between the end surface of the protrusion 21, which is remote 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.

[0032] As shown in FIG4 , the switching valve further includes a connecting pipe 30 , which is connected to the circulation channel 211 and has an interference fit with the circulation channel 211 . Furthermore, the connecting pipe 30 is disposed inside the valve seat 20 , thereby preventing direct contact between the connecting pipe 30 and the valve body 10 . In the prior art, when the connecting pipe is fitted, the main valve seat, the connecting pipe, and the main valve body hole are fitted together. All three have tolerances, which can cause deviations during fitting, resulting in a smaller gap between the copper sleeves at the end of the connecting pipe. During welding, the connecting pipe is inserted into the copper sleeve and then welded with welding wire close to the fitting gap. When welding on two short connecting pipes, the welding wire can adhere to the upper end of the short copper sleeve and the lower end of the long copper sleeve due to the close distance between the copper sleeves. In the present application, the connecting pipe 30 is tightly fitted onto the raised portion 21 of the valve seat 20 . Furthermore, since the raised portion 21 protrudes from the valve body 10 , the fitting length between 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. This reduces the center distance error during assembly of the connecting pipe 30, avoids the connecting pipes 30 from tilting and approaching each other, and thus avoids the situation where the copper sleeves of different connecting pipes 30 adhere to each other.

[0033] Specifically, when welding the connecting pipe 30 to the flow channel 211, the welding method is not limited. A welding ring can be placed at the bottom of the valve seat 20, that is, at the root of the connecting pipe 30. Alternatively, a welding ring can be placed on the end of the flow channel 211 away from the valve body 10, or solder paste can be applied, and then the welding can be performed by furnace brazing or other methods.

[0034] Specifically, the interference fit between the connecting pipe 30 and the circulation channel 211 is between 0 and 0.05 mm. Specifically, when the interference fit is within the range of 0 to 0.05 mm, the connecting pipe 30 and the circulation channel 211 are assembled more effectively, facilitating assembly of the connecting pipe 30. Excessive interference fit can lead to assembly difficulties and prolonged assembly time.

[0035] The mounting hole 12 extends along the length of the valve body 10, and the length of the mounting hole 12 is L1. The raised portion 21 has a head end and a tail end that are relatively arranged along the length of the valve body 10, and the maximum distance between the head end and the tail end 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 ensures that the outer edge of the raised portion 21 formed by the head end raised portion and the tail end raised portion has a gap from the inner wall of the mounting hole 12 to accommodate outflowing solder. If L1-L2 is less than 0.4mm, the mounting hole 12 and the valve body 10 cannot form an area large enough to accommodate 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 0.4 mm and 1.6 mm, which can ensure sufficient space to accommodate the outflowing solder and ensure normal assembly between the valve body 10 and the mounting hole 12. In the present application, there is no limitation on whether the values ​​of 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 0.4 mm, 0.8 mm, 1.2 mm, or 1.6 mm, as long as there is sufficient space to accommodate the outflowing solder.

[0036] 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 located at both ends of the straight segment respectively. 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.

[0037] As shown in Figure 5, the surface of the valve seat 20 near the mounting hole 12 is aligned 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 mounting strength of the valve seat 20 and the valve body 10 and facilitating assembly. Flow-blocking grooves 22 are located on both sides of the surface of the valve seat 20 near the mounting hole 12 to prevent the solder at the weld between the valve seat 20 and the connecting pipe 30 from melting and flowing onto the inner wall of the valve body 10, potentially corroding the inner wall.

[0038] As shown in Figure 3, an annular boss 23 is provided on the inner wall of the circulation channel 211 at one end near the valve chamber 11. The annular boss 23 is arranged along the periphery of the circulation channel 211. The provision of the annular boss 23 facilitates the placement of a welding ring for welding the connection between the pipe 30 and the circulation channel 211. The annular boss 23 also serves to limit the axial position of the pipe 30, facilitating the docking of the pipe 30 and the circulation channel 211 and subsequent welding operations.

[0039] 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, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0040] Unless otherwise specified, the relative arrangement of the parts and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. Meanwhile, 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 actual proportional relationships. Technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods 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 can have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, and therefore, once an item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0041] In the description of this application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "horizontal, vertical, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they cannot be understood as limiting the scope of protection of this application; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0042] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. 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 figures. For example, if the device in the 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.

[0043] 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. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0044] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A switching valve, characterized in that, The switching valve includes: A valve body (10), which has a valve cavity (11) and a mounting hole (12), and the valve cavity (11) communicates with the mounting hole (12); A valve seat (20), which is arranged in the valve cavity (11), the valve seat (20) is located at the mounting hole (12), and a plurality of protruding portions (21) are arranged on one side of the valve seat (20) facing the mounting hole (12). A flow-through channel (211) is penetrated through each protruding portion (21), and the flow-through channel (211) communicates with the valve cavity (11). A receiving area is formed between the outer periphery of the protruding portion (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 overflowing solder.

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

3. The switching valve according to claim 1, wherein An inner side of one end of the protruding portion (21) away from the valve cavity (11) has a chamfer 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 interval between the end surface of one end of the protruding portion (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, wherein, The switching valve further includes a connecting pipe (30), the connecting pipe (30) is connected to the flow-through channel (211), and the connecting pipe (30) is in interference fit with the flow-through channel (211).

7. The switching valve according to claim 6, characterized in that, The interference amount between the connecting pipe (30) and the flow-through 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, the protruding portion (21) has a head end and a tail end arranged oppositely along the length direction of the valve body (10), and the maximum interval between the head end and the tail end is L2, wherein 0.4 mm ≤ L1 - L2 ≤ 1.6 mm.

9. The switching valve according to claim 1, wherein The surface of the valve seat (20) on the side close to the mounting hole (12) is adapted to and fits with the inner wall of the valve cavity (11).

10. The switching valve according to claim 1, characterized in that, An annular boss (23) is arranged on the inner wall of one end of the flow-through channel (211) close to the valve cavity (11), and the annular boss (23) is arranged along the peripheral edge of the flow-through channel (211).

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