Switching valve

Abstract

Provided in the present application is a switching valve. The switching valve device comprises: a valve body, which has a valve cavity and comprises a plurality of connecting pipes arranged side by side in the extension direction of the valve body, the plurality of connecting pipes all being in communication with the valve cavity; and a plurality of sleeves arranged side by side, wherein the sleeves are arranged corresponding to the connecting pipes on a one-to-one basis, some of the sections of each sleeve being sleeved outside a corresponding connecting pipe, and the sleeves being configured to communicate the connecting pipes with external pipes; and in every two adjacent sleeves, one sleeve has a constricted section in the middle, the projection, in the extension direction of the valve body, of the end of the other sleeve away from a connecting pipe is located within the projection of the constricted section in the extension direction of the valve body, and the projections, in the extension direction of the valve body, of the portions of the two adjacent sleeves located outside connecting pipes at least partially overlap. By means of the technical solution provided in the present application, the problem in the prior art of two adjacent copper sleeves being easily welded to each other can be solved.

Description

Switching valve

[0001] The present application claims priority to the patent application with the application number 202422658651.1, the title of which is "Switching valve", filed on October 31, 2024, with the State Intellectual Property Office of China. TECHNICAL FIELD

[0002] The present application relates to the technical field of refrigeration, in particular, to a switching valve. BACKGROUND

[0003] The switching valve is a kind of fluid control valve, which is widely used in refrigeration equipment. As shown in FIG. 1 and FIG. 2, the switching valve has a valve body 100 and a slider assembly 200, the valve body 100 has an E connection pipe 101, an S connection pipe 102 and a C connection pipe 103 arranged in sequence and side by side, the switching valve further includes an E copper sleeve 104, an S copper sleeve 105 and a C copper sleeve 106 arranged side by side, the E copper sleeve 104, the S copper sleeve 105 and the C copper sleeve 106 are arranged one by one corresponding to the E connection pipe 101, the S connection pipe 102 and the C connection pipe 103. By moving the slider assembly 200, the switching of the fluid between the multiple connection pipes is changed, thereby realizing the change of the flow direction of the fluid.

[0004] However, when the connection pipes on the switching valve are welded with the external connection pipes through the copper sleeves, the solder may overflow, so that the adjacent two copper sleeves are easily welded together after being heated. SUMMARY

[0005] The present application provides a switching valve to solve the problem that the adjacent two copper sleeves are easily welded together in the prior art.

[0006] The present application provides a switching valve, which includes: a valve body having a valve cavity, the valve body including a plurality of connection pipes arranged side by side along the extension direction of the valve body, the plurality of connection pipes all communicating with the valve cavity; a plurality of sleeve pipes arranged side by side, the sleeve pipes being arranged one by one corresponding to the connection pipes, part of the pipe section of the sleeve pipe being sleeved outside the corresponding connection pipe, the sleeve pipe being used for communicating the connection pipe with an external connection pipe; wherein, in the adjacent two sleeve pipes, the middle part of one of the sleeve pipes has a necked section, and the projection of the other sleeve pipe in the extension direction of the valve body away from the connection pipe is located within the projection of the necked section in the extension direction of the valve body.

[0007] Applying the technical solution of this application, the valve body includes multiple sleeves arranged side by side. In two adjacent sleeves, one sleeve has a constricted section in the middle, and the projection of the end of the other sleeve away from the connecting pipe in the extension direction of the valve body is located within the projection of the constricted section in the extension direction of the valve body. When welding the sleeves to the outer pipe, solder may overflow from the end of the sleeve away from the connecting pipe. The solution of this application increases the distance between the end of the sleeve away from the connecting pipe and the other sleeve to the distance between the end of the sleeve away from the connecting pipe and the constricted section. This increases the spacing between adjacent sleeves, reduces the possibility of adjacent sleeves sticking together due to solder overflow, ensures the connection accuracy between the sleeve and the outer pipe, and improves the processing efficiency and assembly efficiency of the valve body.

[0008] Furthermore, the sleeve includes a first sleeve, and the connecting pipe includes a first connecting pipe. The first sleeve has a first connecting section and a constricted section connected sequentially. The first connecting section is connected to the outside of the first connecting pipe, and the outer diameter of the first connecting section is larger than the outer diameter of the constricted section. Through the above arrangement, although a constricted section is provided on the sleeve, the first connecting section is connected to the outside of the first connecting pipe in a fitted manner. This reduces the difference between the outer diameter of the constricted section and the outer diameter of the first connecting pipe, thereby reducing the change in the flow cross-section when the fluid flows through the first connecting pipe and the first sleeve, and ensuring the stability of the fluid flow within the switching valve.

[0009] Furthermore, the constricted section includes a first stop structure and an intermediate section arranged sequentially, with the first stop structure positioned between the intermediate section and the first connecting section. This arrangement prevents over-assembly during the installation of the connecting pipe and the sleeve, ensuring effective assembly between the switching valve pipe sections.

[0010] Furthermore, the first sleeve also includes a second connecting section. A constricted section is positioned between the first and second connecting sections. The second connecting section connects to the outer pipe. The outer diameter of the second connecting section is larger than the outer diameter of the constricted section. The constricted section also includes a second stop structure positioned between the intermediate section and the second connecting section. Through this configuration, the second connecting section mates with the outer side of the outer pipe, thus reducing the difference between the outer diameter of the constricted section and the outer diameter of the outer pipe. This reduces the change in the flow cross-section when the fluid flows through the first sleeve and the outer pipe, ensuring the stability of fluid flow within the switching valve. Simultaneously, it prevents over-assembly during the installation of the outer pipe and the sleeve, ensuring effective assembly between the switching valve pipe sections.

[0011] Furthermore, the sleeve also includes a second sleeve, and the connecting pipe also includes a second connecting pipe. A section of the second sleeve is fitted over the outside of the second connecting pipe. The second connecting pipe and the first connecting pipe are arranged side by side along the extension direction of the valve body. The projection of the end of the second sleeve away from the second connecting pipe in the extension direction of the valve body is located within the projection of the middle section in the extension direction of the valve body. This further increases the distance between the end of the second sleeve away from the second connecting pipe and the first sleeve, thereby further reducing the possibility of welding between adjacent copper sleeves.

[0012] Furthermore, the constricted section also includes: a first tapered section, one end of which is connected to the middle section, and the other end of which is connected to the first connecting section. The inner diameter of the first tapered section gradually increases from the middle section towards the first connecting section, forming a first stop structure, and / or; a second tapered section, one end of which is connected to the middle section, and the other end of which is connected to the second connecting section. The inner diameter of the second tapered section gradually increases from the middle section towards the second connecting section, forming a second stop structure. Setting the stop structure as a tapered section not only facilitates the assembly of the sleeve, but also provides buffering and guidance when fluid passes through pipe sections with different orifice diameters, preventing blockages and improving fluid flow smoothness, thus ensuring the fluid flow rate within the switching valve.

[0013] Furthermore, the outer diameter of the constricted section is B1, the inner diameter of the first connecting pipe is D, and the wall thickness of the first sleeve is t, where B1 ≥ D + 2t. This increases the spacing between adjacent copper sleeves, reduces the risk of welding between them, and avoids throttling in the copper sleeves, ensuring the flow rate of fluid within the switching valve.

[0014] Furthermore, the sleeve is made of copper, and the connecting pipe is made of steel. The projection of the second sleeve in the extension direction of the valve body is located within the projection of the first sleeve in the extension direction of the valve body. When welding the second sleeve to the outer pipe, the entire second sleeve needs to be heated by heating methods such as flame welding. During the heating process, adjacent pipes will inevitably be heated. Copper has better thermal conductivity than steel. With the above-mentioned arrangement, when the second sleeve is heated, the heat from the first sleeve, which is made of copper, can be conducted away in time, avoiding the situation where the first connecting pipe, which is made of steel, will experience local heat accumulation and overheating.

[0015] Furthermore, the constricted section is an arc-shaped section. This reduces the impact force of the fluid on the constricted section, reduces fluid energy loss, further improves the continuity of fluid flow when passing through the sleeve, and increases the fluid flow rate.

[0016] Furthermore, the connecting pipe also includes a third connecting pipe, and the sleeve also includes a third sleeve. The third connecting pipe is arranged side by side with the first and second connecting pipes, with the first connecting pipe located between the second and third connecting pipes. A portion of the third sleeve is fitted over the outside of the third connecting pipe. The projection of the end of the third sleeve away from the third connecting pipe in the extension direction of the valve body lies within the projection of the middle section in the extension direction of the valve body. The projection of the third sleeve in the extension direction of the valve body lies within the projection of the first sleeve in the extension direction of the valve body. This arrangement reduces the risk of the third sleeve welding to the first sleeve during welding heating. Furthermore, when the third sleeve is heated, heat can be effectively conducted away from the adjacent copper first sleeve, preventing overheating caused by localized heat accumulation in the first connecting pipe when the adjacent steel first connecting pipe is used.

[0017] Furthermore, the inner diameters of the ends of the multiple sleeves furthest from the connecting pipes are all the same. This ensures that the fluid in each connecting pipe on the valve body has the same flow cross-section when flowing through the corresponding sleeve, thus avoiding the impact on the stability of fluid pressure or flow velocity due to excessive changes in the inner diameter when the fluid flows through different connecting pipes and sleeves. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 shows a schematic diagram of a switching valve structure in the prior art;

[0020] Figure 2 shows a schematic diagram of the assembly of the nozzle and the copper sleeve in the prior art;

[0021] Figure 3 shows a schematic diagram of the switching valve provided in Embodiment 1 of this application;

[0022] Figure 4 shows an assembly diagram of the connecting pipe, sleeve, and outer pipe provided in Embodiment 1 of this application;

[0023] Figure 5 shows a schematic diagram of the structure of the first sleeve provided in Embodiment 1 of this application;

[0024] Figure 6 shows an assembly diagram of the connecting pipe and sleeve provided in Embodiment 1 of this application;

[0025] Figure 7 shows an assembly diagram of the connecting pipe and sleeve provided in Embodiment 2 of this application.

[0026] The above-mentioned figures include the following reference numerals: 10, valve body; 20, connecting pipe; 21, first connecting pipe; 22, second connecting pipe; 23, third connecting pipe; 30, sleeve; 31, constricted section; 311, first stop structure; 312, intermediate section; 313, second stop structure; 32, first sleeve; 321, first connecting section; 322, second connecting section; 33, second sleeve; 34, third sleeve; 40, outer pipe; 100, valve body; 101, E pipe; 102, S pipe; 103, C pipe; 104, E copper sleeve; 105, S copper sleeve; 106, C copper sleeve; 200, slider assembly. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0028] As shown in Figures 3 to 6, a first embodiment of this application provides a switching valve, which includes a valve body 10 and a plurality of sleeves 30 arranged side by side. The valve body 10 has a valve cavity and includes a plurality of connecting pipes 20 arranged side by side along the extending direction of the valve body 10, all of which communicate with the valve cavity. Each sleeve 30 corresponds to one of the connecting pipes 20, with a portion of the sleeve 30 sleeved over the outside of the corresponding connecting pipe 20, and the sleeve 30 connects the connecting pipe 20 to an external connecting pipe 40. In two adjacent sleeves 30, one sleeve 30 has a constricted section 31 in the middle, and the projection of the end of the other sleeve 30 away from the connecting pipe 20 in the extending direction of the valve body 10 lies within the projection of the constricted section 31 in the extending direction of the valve body 10. The extending direction of the valve body 10 is the same as the extending direction of the connecting pipes 20.

[0029] Applying the technical solution of this application, the valve body 10 includes a plurality of sleeves 30 arranged side by side. In two adjacent sleeves 30, one sleeve 30 has a constricted section in the middle, and the projection of the end of the other sleeve 30 away from the connecting pipe in the extension direction of the valve body 10 is located within the projection of the constricted section 31 in the extension direction of the valve body 10. When the sleeve 30 is welded to the outer pipe 40, solder may overflow from the end of the sleeve 30 away from the connecting pipe 20. The solution of this application increases the distance between the end of the sleeve 30 away from the connecting pipe 20 and the other sleeve 30 to the distance between the end of the sleeve 30 away from the connecting pipe 20 and the constricted section 31. This increases the spacing between adjacent sleeves 30, reduces the possibility of adjacent sleeves 30 sticking together due to solder overflow, thereby reducing the risk of welding between adjacent sleeves 30, ensuring the connection accuracy between the sleeve 30 and the outer pipe 40, and improving the processing efficiency and assembly efficiency of the valve body 10.

[0030] As shown in Figure 4, the sleeve 30 includes a first sleeve 32, and the connecting pipe 20 includes a first connecting pipe 21. The first sleeve 32 has a first connecting section 321 and a constricted section 31 connected sequentially. The first connecting section 321 is connected to the outside of the first connecting pipe 21, and the outer diameter of the first connecting section 321 is larger than the outer diameter of the constricted section 31. Although the constricted section 31 is provided on the first sleeve 32, the first connecting section 321 corresponds to the outside of the first connecting pipe 21, and the second connecting section 322 corresponds to the outside of the outer pipe 40. This reduces the difference between the outer diameter of the constricted section 31 and the outer diameters of the first connecting pipe 21 and the outer pipe 40, thereby reducing the change in the flow cross-section when the fluid flows through the first connecting pipe 21 and the first sleeve 32, and ensuring the stability of the fluid flow within the switching valve.

[0031] The outer diameters of the first connecting segment 321 and the second connecting segment 322 are not limited; they can be adjusted according to the outer diameters of the connecting pipe 20 and the outer pipe 40. In this embodiment, the outer diameter of the connecting pipe 20 is larger than the outer diameter of the outer pipe 40, therefore the outer diameter of the first connecting segment 321 is larger than the outer diameter of the second connecting segment 322. In other embodiments of this application, the outer diameter of the connecting pipe 20 is smaller than the outer diameter of the outer pipe 40, and the outer diameter of the first connecting segment 321 is smaller than the outer diameter of the second connecting segment 322. In other embodiments, the outer diameter of the connecting pipe 20 is equal to the outer diameter of the outer pipe 40, and the outer diameter of the first connecting segment 321 is equal to the outer diameter of the second connecting segment 322.

[0032] In this application, the specific structure of the second sleeve 33 is not limited. In this embodiment, since the outer diameter of the connecting pipe 20 is larger than the outer diameter of the outer pipe 40, the second sleeve 33 has a first contraction section in the middle so that the end of the second sleeve 33 can be adapted to the size of the outer pipe 40. In other embodiments, the outer diameter of the connecting pipe 20 is smaller than the outer diameter of the outer pipe 40, and the second sleeve 33 has a first expansion section in the middle so that the end of the second sleeve 33 can be smoothly assembled with the outer pipe 40. In still other embodiments, the outer diameter of the connecting pipe 20 is equal to the outer diameter of the outer pipe 40, and the second sleeve 33 has a straight cylindrical structure with no change in its outer diameter.

[0033] As shown in Figure 5, the constricted section 31 includes a first stop structure 311 and an intermediate section 312 arranged sequentially. The first stop structure 311 is located between the intermediate section 312 and the first connecting section 321. The first stop structure 311 can limit the assembly position of the first connecting pipe 21 on the first connecting section 321, so as to avoid damage to the first sleeve 32 or the first connecting pipe 21 caused by over-assembly of the first connecting pipe 21 and the first connecting section 321 during installation, and effectively improve the assembly effect of the first sleeve 32 and the first connecting pipe 21.

[0034] Furthermore, the first sleeve 32 also includes a second connecting section 322. A constricted section 31 is disposed between the first connecting section 321 and the second connecting section 322. The second connecting section 322 is connected to the outer pipe 40, and the outer diameter of the second connecting section 322 is larger than the outer diameter of the constricted section 31. In this way, the corresponding fit between the second connecting section 322 and the outer side of the outer pipe 40 can reduce the difference between the outer diameter of the constricted section 31 and the outer diameter of the outer pipe 40, thereby reducing the change in the flow cross section when the fluid flows through the first sleeve 32 and the outer pipe 40, and further improving the stability of the fluid flow within the switching valve.

[0035] Specifically, the constricted section 31 also includes a second stop structure 313, which is disposed between the intermediate section 312 and the second connecting section 322. The second stop structure 313 can limit the assembly position of the external pipe 40 on the second connecting section 322, preventing over-assembly of the external pipe 40 and the second connecting section 322 during installation and thus avoiding damage to the first sleeve 32 or the external pipe 40, effectively improving the assembly effect of the first sleeve 32 and the external pipe 40.

[0036] The specific structure of the first stop structure 311 and the second stop structure 313 is not limited; they can be set as a tapered structure or a protruding structure extending into the sleeve 30.

[0037] Specifically, the sleeve 30 further includes a second sleeve 33, and the connecting pipe 20 further includes a second connecting pipe 22. A portion of the second sleeve 33 is fitted over the outside of the second connecting pipe 22. The second connecting pipe 22 and the first connecting pipe 21 are arranged side by side along the extension direction of the valve body 10. The second sleeve 33 enables the connection between the second connecting pipe 22 and the outer connecting pipe 40, allowing the second connecting pipe 22 to be assembled with outer connecting pipes 40 of different sizes, thus improving the applicability and practicality of the switching valve.

[0038] Preferably, the projection of the end of the second sleeve 33 away from the second connecting pipe 22 in the extending direction of the valve body 10 is located within the projection of the middle section 312 in the extending direction of the valve body 10. This can further increase the distance between the end of the second sleeve 33 away from the second connecting pipe 22 and the first sleeve 32, thereby further reducing the possibility of welding between adjacent sleeves 30.

[0039] As shown in Figure 5, the constricted section 31 also includes a first conical section and a second conical section. One end of the first conical section is connected to the intermediate section 312, and the other end is connected to the first connecting section 321. The inner diameter of the first conical section gradually increases from the intermediate section 312 towards the first connecting section 321, forming a first stop structure 311. One end of the second conical section is connected to the intermediate section 312, and the other end is connected to the second connecting section 322. The inner diameter of the second conical section gradually increases from the intermediate section 312 towards the second connecting section 322, forming a second stop structure 313. Setting the stop structure as a conical section not only facilitates the assembly of the sleeve 30, but also provides buffering and guidance when fluid passes through pipe sections with different orifice diameters, preventing blockages and improving fluid flow smoothness, thus ensuring the fluid flow rate within the switching valve. Furthermore, the conical structure is simple to manufacture, saving production costs.

[0040] In other embodiments, the constricted section 31 includes a first tapered section, and the second stop structure 313 is of other structures.

[0041] In another embodiment of this application, the constricted section 31 includes a second tapered section, and the first stop structure 311 is of other structures.

[0042] As shown in Figures 5 and 6, the outer diameter of the constricted section 31 is B1, the inner diameter of the first connecting pipe 21 is D, and the wall thickness of the first sleeve 32 is t, where B1 ≥ D + 2t. When B1 < D + 2t, the outer diameter of the constricted section 31 is too small, which may cause throttling, resulting in a small flow rate of fluid through the constricted section 31, affecting the normal operation of the switching valve. Therefore, in this application, B1 ≥ D + 2t. This increases the spacing between adjacent sleeves 30, reduces the risk of welding adjacent copper sleeves, and avoids throttling in the sleeves 30, ensuring the flow rate of fluid within the switching valve. The inner diameter D of the first connecting pipe 21 and the wall thickness t of the first sleeve 32 are not limited; they can be selected and adjusted according to the actual application scenario of the switching valve.

[0043] In another embodiment of this application, as shown in FIG7, the sleeve 30 is made of copper, the connecting pipe 20 is made of steel, and the projection of the second sleeve 33 in the extension direction of the valve body 10 is located within the projection of the first sleeve 32 in the extension direction of the valve body 10. Specifically, the distance between the end of the second sleeve 33 near the valve body 10 and the valve body 10 is H1, and the distance between the end of the first connecting segment 321 near the valve body 10 and the valve body 10 is H2, where H1 ≥ H2. Compared to existing technologies, as shown in Figure 2, the distance from the bottom surface of copper sleeves E104 and C106 to the valve body 100 is H3, and the distance from the bottom surface of copper sleeve S105 to the valve body 100 is H4, where H3 < H4. In the welding process between the outer pipe and the copper sleeve, the middle outer pipe and copper sleeve S105 are welded first, followed by the welding of the outer pipes on both sides to the copper sleeve. When welding the outer pipes on both sides to copper sleeves E104 and C106, the entire copper sleeves E104 and C106 need to be heated using methods such as flame welding. During the heating process, the adjacent pipes in the middle will inevitably be heated. As shown in Figure 2, when the bottom surface of copper sleeves E104 and C106 is heated, the S-pipe 102 will also be heated. Copper has better thermal conductivity than steel, while the S-pipe 102 is made of steel, which has poor thermal conductivity and cannot quickly conduct heat away, easily leading to localized overheating and overburning of the S-pipe 102. With the above-mentioned configuration, when the second sleeve 33 is heated, the heat can be conducted away in a timely manner through the first sleeve 32, which is made of copper, thus avoiding the situation where the first connecting pipe 21, which is made of steel, will overheat due to local heat accumulation.

[0044] In this embodiment, the welding process of the sleeve 30 to the connecting pipe 20 and the outer pipe 40 is not limited, and other welding processes such as brazing, laser welding, ultrasonic welding, and flame welding can be used.

[0045] As shown in Figure 6, the connecting pipe 20 also includes a third connecting pipe 23, and the sleeve 30 also includes a third sleeve 34. The third connecting pipe 23 is arranged side by side with the first connecting pipe 21 and the second connecting pipe 22. The first connecting pipe 21 is located between the second connecting pipe 22 and the third connecting pipe 23. A portion of the third sleeve 34 is sleeved on the outside of the third connecting pipe 23. The projection of the end of the third sleeve 34 away from the third connecting pipe 23 in the extension direction of the valve body 10 is located within the projection of the middle section 312 in the extension direction of the valve body 10. The projection of the third sleeve 34 in the extension direction of the valve body 10 is located within the projection of the first sleeve 32 in the extension direction of the valve body 10. This arrangement can reduce the risk of the third sleeve 34 welding to the first sleeve 32 during welding heating. Furthermore, when the third sleeve 34 is heated, the heat can be promptly conducted away from the first sleeve 32, which is made of copper, thus preventing overheating caused by localized heat accumulation in the first connecting pipe 21, which is made of steel.

[0046] Specifically, the outer diameter of the first connecting section 321 is B2, the outer diameter of the second connecting section 322, the outer diameter of the end of the second sleeve 33 away from the second connecting pipe 22, and the outer diameter of the end of the third sleeve 34 away from the third connecting pipe 23 are all B, where B > B1. The distance between the axes of adjacent sleeves 30 is L2, and the distance between the middle section 312 and the upper end face of the adjacent sleeve 30 is A2, where A2 = L2 - (B / 2) - (B1 / 2). In the prior art, as shown in Figure 2, the outer diameter of the copper sleeves is B3, where B3 = B. The distance between the axes of adjacent copper sleeves is L1, and the distance between adjacent copper sleeves is A1, where A1 = L1 - (B3 / 2) - (B3 / 2). Since A2 > A1, this application increases the spacing between adjacent sleeves 30 by setting the constriction section 31, thereby reducing the risk of welding between adjacent sleeves 30.

[0047] As shown in Figure 7, a switching valve is provided in the second embodiment of this application. Unlike the first embodiment, the constricted section 31 is an arc-shaped section. This reduces the impact force of the fluid on the constricted section 31, reduces the energy loss of the fluid, further improves the continuity of fluid flow when passing through the sleeve 30, and increases the fluid flow rate.

[0048] The specific shape of the arc segment is not limited. In this embodiment, B2 > B, and the arc segment has an asymmetrical structure. In other embodiments, B2 < B, and the arc segment has an asymmetrical structure. In another embodiment of this application, B2 = B, and the arc segment has a symmetrical structure.

[0049] The connecting pipe 20 and the corresponding sleeve 30 together form a flow channel, which is connected to the valve cavity. The switching valve has multiple flow channels, and the minimum flow area of ​​each of the multiple flow channels is equal. Through the above arrangement, the fluid can be smoothly flowed between the connecting pipes 20 and the sleeves 30, thereby improving the continuity of fluid flow and increasing the working efficiency of the valve body 10 device.

[0050] In this application, the inner diameters of the ends of the multiple sleeves 30 furthest from the connecting pipe 20 are all the same. This ensures that the fluid in each connecting pipe 20 on the valve body 10 has the same flow cross-section when flowing through the corresponding sleeve 30, thus avoiding the instability of fluid pressure or flow rate due to excessive changes in the inner diameter when the fluid flows through different connecting pipes 20 and sleeves 30.

[0051] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A switching valve, characterized in that, The switching valve includes: The valve body (10) has a valve cavity. The valve body (10) includes a plurality of connecting pipes (20) arranged side by side along the extension direction of the valve body (10), and the plurality of connecting pipes (20) are all in communication with the valve cavity. Multiple sleeves (30) are arranged side by side, and each sleeve (30) is arranged in a one-to-one correspondence with the connecting pipe (20). A portion of the sleeve (30) is sleeved on the outside of the corresponding connecting pipe (20). The sleeve (30) is used to connect the connecting pipe (20) and the outer pipe (40). Among the two adjacent sleeves (30), one of the sleeves (30) has a constricted section (31) in the middle, and the projection of the end of the other sleeve (30) away from the connecting pipe (20) in the extension direction of the valve body (10) is located within the projection of the constricted section (31) in the extension direction of the valve body (10).

2. The switching valve according to claim 1, characterized in that, The sleeve (30) includes a first sleeve (32), and the connecting pipe (20) includes a first connecting pipe (21). The first sleeve (32) has a first connecting section (321) and a constricted section (31) connected in sequence. The first connecting section (321) is connected to the outside of the first connecting pipe (21), and the outer diameter of the first connecting section (321) is larger than the outer diameter of the constricted section (31).

3. The switching valve according to claim 2, characterized in that, The constricted section (31) includes a first stop structure (311) and an intermediate section (312) arranged in sequence, with the first stop structure (311) disposed between the intermediate section (312) and the first connecting section (321).

4. The switching valve according to claim 3, characterized in that, The first sleeve (32) further includes a second connecting section (322), the constricted section (31) is disposed between the first connecting section (321) and the second connecting section (322), the second connecting section (322) is connected to the outer tube (40), the outer diameter of the second connecting section (322) is larger than the outer diameter of the constricted section (31), the constricted section (31) further includes a second stop structure (313), the second stop structure (313) is disposed between the intermediate section (312) and the second connecting section (322).

5. The switching valve according to claim 4, characterized in that, The sleeve (30) further includes a second sleeve (33), and the connecting pipe (20) further includes a second connecting pipe (22). A portion of the second sleeve (33) is sleeved on the outside of the second connecting pipe (22). The second connecting pipe (22) and the first connecting pipe (21) are arranged side by side along the extension direction of the valve body (10). The projection of the end of the second sleeve (33) away from the second connecting pipe (22) in the extension direction of the valve body (10) is located within the projection of the middle section (312) in the extension direction of the valve body (10).

6. The switching valve according to claim 5, characterized in that, The constricted section (31) also includes: A first tapered segment, one end of which is connected to the middle segment (312), and the other end of which is connected to the first connecting segment (321). The inner diameter of the first tapered segment gradually increases from the middle segment (312) toward the first connecting segment (321). The first tapered segment forms the first stop structure (311), and / or; The second tapered segment has one end connected to the middle segment (312) and the other end connected to the second connecting segment (322). The inner diameter of the second tapered segment gradually increases from the middle segment (312) to the second connecting segment (322), and the second tapered segment forms the second stop structure (313).

7. The switching valve according to claim 2, characterized in that, The outer diameter of the constricted section (31) is B1, the inner diameter of the first connecting pipe (21) is D, and the wall thickness of the first sleeve (32) is t, wherein B1≥D+2t.

8. The switching valve according to claim 5, characterized in that, The sleeve (30) is made of copper, the connecting pipe (20) is made of steel, and the projection of the second sleeve (33) in the extension direction of the valve body (10) is located within the projection of the first sleeve (32) in the extension direction of the valve body (10).

9. The switching valve according to claim 1, characterized in that, The constricted section (31) is an arc-shaped section.

10. The switching valve according to claim 5, characterized in that, The connecting pipe (20) further includes a third connecting pipe (23), and the sleeve (30) further includes a third sleeve (34). The third connecting pipe (23) is arranged side by side with the first connecting pipe (21) and the second connecting pipe (22). The first connecting pipe (21) is located between the second connecting pipe (22) and the third connecting pipe (23). A portion of the third sleeve (34) is sleeved on the outside of the third connecting pipe (23). The projection of the end of the third sleeve (34) away from the third connecting pipe (23) in the extension direction of the valve body (10) is located within the projection of the middle section (312) in the extension direction of the valve body (10). The projection of the third sleeve (34) in the extension direction of the valve body (10) is located within the projection of the first sleeve (32) in the extension direction of the valve body (10).

11. The switching valve according to claim 1, characterized in that, The inner diameters of the ends of the multiple sleeves (30) that are away from the connecting tube (20) are all the same.

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