Switching valve

Abstract

The utility model provides a switching valve, which comprises a valve body, a plurality of connecting pipes, a plurality of connecting pipes and a plurality of connecting pipes, the valve body is provided with a valve cavity, the valve body comprises a plurality of connecting pipes which are arranged side by side along the extension direction of the valve body, and the plurality of connecting pipes are communicated with the valve cavity; the sleeves are arranged side by side, the sleeves and the connecting pipes are arranged in a one-to-one correspondence mode, part of pipe sections of the sleeves are arranged on the outer sides of the corresponding connecting pipes in a sleeving mode, and the sleeves are used for communicating the connecting pipes with external pipes; in every two adjacent sleeves, a necking section is arranged in the middle of one sleeve, and the projection, in the extending direction of the valve body, of the end, away from the connecting pipe, of the other sleeve is located in the projection, in the extending direction of the valve body, of the necking section. The projections of the parts, located outside the connecting pipe, of every two adjacent sleeves in the extending direction of the valve body at least partially coincide. According to the technical scheme provided by the utility model, the problem that two adjacent copper bushes are easily welded in the prior art can be solved.

Description

Technical Field

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

[0002] The switching valve is a fluid control valve that is widely used in refrigeration equipment. Figure 1 and Figure 2 As shown, the switching valve comprises a valve body 100 and a slider assembly 200. The valve body 100 has an E-connecting pipe 101, an S-connecting pipe 102, and a C-connecting pipe 103 arranged in sequence. The switching valve also includes an E-connecting pipe 104, an S-connecting pipe 105, and a C-connecting pipe 106 arranged in sequence. The E-connecting pipe 104, the S-connecting pipe 105, and the C-connecting pipe 106 are respectively arranged in a one-to-one correspondence with the E-connecting pipe 101, the S-connecting pipe 102, and the C-connecting pipe 103. By moving the slider assembly 200, the fluid flow between the multiple connecting pipes is switched, thereby changing the flow direction of the fluid.

[0003] However, when the connecting pipe on the switching valve is welded to the external connecting pipe through the copper sleeve, the solder may overflow, so that the two adjacent copper sleeves are easily welded after being heated. Utility Model Content

[0004] The utility model provides a switching valve to solve the problem in the prior art that two adjacent copper sleeves are easily welded.

[0005] The utility model provides a switching valve, which includes: a valve body having a valve cavity, the valve body including a plurality of connecting pipes arranged side by side along the extension direction of the valve body, the plurality of connecting pipes being communicated with the valve cavity; a plurality of sleeves arranged side by side, the sleeves being arranged in one-to-one correspondence with the connecting pipes, partial pipe sections of the sleeves being sleeved on the outside of the corresponding connecting pipes, the sleeves being used to connect the connecting pipes with external pipes; wherein, in two adjacent sleeves, the middle part of one of the sleeves has a necking section, 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 necking section in the extension direction of the valve body.

[0006] By applying the technical solution of the present invention, the valve body includes a plurality of sleeves arranged side by side. Among two adjacent sleeves, one sleeve has a tapered section in the middle, and the projection of the other sleeve's end away from the connecting pipe in the extension direction of the valve body is located within the projection of the tapered section in the extension direction of the valve body. When welding the sleeve to the external pipe, solder may overflow from the sleeve's end away from the connecting pipe. The solution of the present application increases the distance between the sleeve's end away from the connecting pipe and the other sleeve to the distance between the sleeve's end away from the connecting pipe and the tapered section, thereby increasing the spacing between adjacent sleeves and reducing the possibility of adhesion between adjacent sleeves due to solder overflow. This ensures the connection accuracy between the sleeve and the external pipe, while also improving the processing efficiency and assembly efficiency of the valve body.

[0007] 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 necked section connected in sequence. The first connecting section is connected to the outer side of the first connecting pipe, and the outer diameter of the first connecting section is larger than the outer diameter of the necked section. Through the above arrangement, although the necked section is provided on the sleeve, the first connecting section is cooperatively connected to the outer side of the first connecting pipe. This can reduce the difference between the outer diameter of the necked 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, thereby ensuring the stability of the fluid flow in the switching valve.

[0008] Furthermore, the constricted section includes a first stop structure and an intermediate section arranged in sequence, and the first stop structure is arranged between the intermediate section and the first connecting section. Through the above arrangement, over-assembly of the connecting pipe and the sleeve can be avoided during installation, ensuring the assembly effect between the switching valve pipe sections.

[0009] Furthermore, the first sleeve also includes a second connecting section, a tapered section disposed between the first and second connecting sections, the second connecting section being connected to the external pipe, the outer diameter of the second connecting section being greater than the outer diameter of the tapered section, and the tapered section also including a second stop structure disposed between the intermediate section and the second connecting section. This arrangement allows the second connecting section to be mated with the outer side of the external pipe, thereby reducing the difference between the outer diameters of the tapered section and the external pipe, thereby reducing the change in the flow cross-section of the fluid as it flows through the first sleeve and the external pipe, thereby ensuring the stability of the fluid flow within the switching valve. This also prevents over-assembly of the external pipe and sleeve during installation, ensuring a well-assembled switching valve between the pipe sections.

[0010] Furthermore, the sleeve further includes a second sleeve, and the connecting pipe further includes a second connecting pipe. A portion of the second sleeve is sleeved outside 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 can further increase 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.

[0011] Furthermore, the constricted section further includes: a first tapered section, one end of the first tapered section is connected to the middle section, the other end of the first tapered section is connected to the first connecting section, the inner diameter of the first tapered section gradually increases from the middle section toward the first connecting section, and the first tapered section forms a first stop structure, and / or; a second tapered section, one end of the second tapered section is connected to the middle section, the other end of the second tapered section is connected to the second connecting section, the inner diameter of the second tapered section gradually increases from the middle section toward the second connecting section, and the second tapered section forms a second stop structure. Setting the stop structure as a tapered section not only facilitates the assembly of the sleeve, but also enables the tapered section to provide buffering and guidance when the fluid passes through pipe sections of different apertures, thereby avoiding blockage of the fluid when flowing through different pipe sections, improving the smoothness of the fluid flow, and ensuring the flow rate of the fluid in the switching valve.

[0012] 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, reducing the risk of welding adjacent copper sleeves, while also preventing throttling of the copper sleeves and ensuring the flow rate of the fluid within the switching valve.

[0013] Furthermore, the sleeve is made of copper, the connecting pipe is made of steel, and 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 the second sleeve is welded to the external pipe, it is necessary to heat the entire second sleeve by a heating method such as flame welding, and the adjacent pipes will inevitably be heated during the heating process. Copper has better thermal conductivity than steel. Through the above-mentioned arrangement, when the second sleeve is heated, the adjacent pipe is made of copper, and the heat can be promptly conducted away from the first sleeve, thereby avoiding the situation where the first connecting pipe, which is made of steel, is the adjacent pipe, and overburning may occur due to local heat accumulation in the first connecting pipe.

[0014] Furthermore, the constricted section is an arc-shaped section, which can reduce the impact force of the fluid on the constricted section, reduce the energy loss of the fluid, further improve the continuity of the fluid flow when passing through the casing, and increase the flow rate of the fluid.

[0015] 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 connecting pipe and the second connecting pipe, the first connecting pipe is located between the second connecting pipe and the third connecting pipe, and a portion of the third sleeve is sleeved on 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 is located within the projection of the middle section in the extension direction of the valve body, and the projection of the third 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. Through the above arrangement, the risk of the third sleeve being welded to the first sleeve during welding heating can be reduced. When the third sleeve is heated, the heat of the first sleeve, which is an adjacent pipe made of copper, can be promptly transferred away, thereby avoiding the situation where local heat accumulation in the first connecting pipe causes overburning when the adjacent pipe is made of steel.

[0016] Furthermore, the inner diameters of the ends of the multiple sleeves away from the connecting pipes are all the same. This ensures that the flow cross-sections of the fluid in each connecting pipe on the valve body are the same when flowing through the corresponding sleeve, thereby preventing the fluid from affecting the stability of the fluid pressure or flow rate due to excessive changes in the inner diameters when the fluid flows through different connecting pipes and sleeves. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0018] Figure 1 A schematic diagram of the switching valve structure in the prior art is shown;

[0019] Figure 2 A schematic diagram of the assembly of a connecting pipe and a copper sleeve in the prior art is shown;

[0020] Figure 3 The structure diagram of the switching valve provided in the first embodiment of the present invention is shown;

[0021] Figure 4 The figure shows an assembly diagram of the connecting pipe, sleeve and external pipe provided in the first embodiment of the present invention;

[0022] Figure 5 The structure diagram of the first sleeve provided in the first embodiment of the present invention is shown;

[0023] Figure 6 The figure shows an assembly diagram of the connecting pipe and the sleeve provided in the first embodiment of the present invention;

[0024] Figure 7 The figure shows an assembly diagram of the connecting pipe and the sleeve provided in the second embodiment of the present invention.

[0025] The above drawings include the following reference numerals:

[0026] 10. Valve body;

[0027] 20. Connecting pipe;

[0028] 21. First connecting pipe;

[0029] 22. Second connecting pipe;

[0030] 23. Third connecting pipe;

[0031] 30. Casing;

[0032] 31. Narrowing section; 311. First stop structure;

[0033] 312, middle section; 313, second stop structure;

[0034] 32. First sleeve; 321. First connecting section; 322. Second connecting section;

[0035] 33. Second casing;

[0036] 34. The third casing;

[0037] 40. External pipe;

[0038] 100, valve body;

[0039] 101. E takes over; 102. S takes over; 103. C takes over;

[0040] 104, E copper sleeve; 105, S copper sleeve; 106, C copper sleeve;

[0041] 200. Slider component. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0043] like Figures 3 to 6As shown, the first embodiment of the present invention 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 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 connected to the valve cavity. The sleeves 30 are arranged in a one-to-one correspondence with the connecting pipes 20, and 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 with the external pipe 40. Among the two adjacent sleeves 30, one sleeve 30 has a narrowing 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 narrowing section 31 in the extension direction of the valve body 10. The extension direction of the valve body 10 is the same as the extension direction of the connecting pipe 20.

[0044] Using the technical solution of the present invention, the valve body 10 includes a plurality of sleeves 30 arranged side by side. Among two adjacent sleeves 30, one sleeve 30 has a tapered section in the middle, and the projection of the other sleeve 30's end away from the connecting pipe in the extension direction of the valve body 10 is located within the projection of the tapered section 31 in the extension direction of the valve body 10. When welding the sleeve 30 to the external pipe 40, solder may overflow from the end of the sleeve 30 away from the connecting pipe 20. The solution of the present 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 tapered section 31. This increases the spacing between adjacent sleeves 30, reduces the possibility of adjacent sleeves 30 sticking together due to solder overflow, and thus reduces the risk of welding between adjacent sleeves 30. This ensures the connection accuracy between the sleeve 30 and the external pipe 40, while improving the processing and assembly efficiency of the valve body 10.

[0045] like Figure 4 As shown, 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 narrowing section 31 connected in sequence. The first connecting section 321 is connected to the outer side of the first connecting pipe 21, and the outer diameter of the first connecting section 321 is larger than the outer diameter of the narrowing section 31. Although the narrowing section 31 is provided on the first sleeve 32, the first connecting section 321 corresponds to the outer side of the first connecting pipe 21, and the second connecting section 322 corresponds to the outer side of the external pipe 40. This reduces the difference between the outer diameter of the narrowing section 31 and the outer diameters of the first connecting pipe 21 and the external pipe 40. This further reduces the change in the flow cross-section when the fluid flows through the first connecting pipe 21 and the first sleeve 32, thereby ensuring the stability of the fluid flow within the switching valve.

[0046] There is no limitation on the size difference between the outer diameter of the first connecting section 321 and the outer diameter of the second connecting section 322, and they can be adjusted accordingly according to the outer diameter of the connecting tube 20 and the outer diameter of the external tube 40. In this embodiment, the outer diameter of the connecting tube 20 is larger than the outer diameter of the external tube 40, so the outer diameter of the first connecting section 321 is larger than the outer diameter of the second connecting section 322. In other embodiments of the present application, the outer diameter of the connecting tube 20 is smaller than the outer diameter of the external tube 40, and the outer diameter of the first connecting section 321 is smaller than the outer diameter of the second connecting section 322. In other embodiments, the outer diameter of the connecting tube 20 is equal to the outer diameter of the external tube 40, and the outer diameter of the first connecting section 321 is equal to the outer diameter of the second connecting section 322.

[0047] In this application, the specific structure of the second sleeve 33 is not limited. In this embodiment, because the outer diameter of the connecting tube 20 is larger than that of the external tube 40, the middle portion of the second sleeve 33 has a first contraction section to allow the end of the second sleeve 33 to adapt to the size of the external tube 40. In other embodiments, the outer diameter of the connecting tube 20 is smaller than that of the external tube 40, and the middle portion of the second sleeve 33 has a first expansion section to allow the end of the second sleeve 33 to be smoothly assembled with the external tube 40. In other embodiments, the outer diameter of the connecting tube 20 is equal to that of the external tube 40, the second sleeve 33 is a straight tube structure, and the outer diameter of the second sleeve 33 does not change.

[0048] like Figure 5 As shown, the necked section 31 includes a first stop structure 311 and an intermediate section 312 arranged in sequence. The first stop structure 311 is arranged 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 tube 21 on the first connecting section 321, thereby avoiding damage to the first sleeve 32 or the first connecting tube 21 caused by excessive assembly of the first connecting tube 21 and the first connecting section 321 during installation, thereby effectively improving the assembly effect of the first sleeve 32 and the first connecting tube 21.

[0049] Furthermore, the first sleeve 32 also includes a second connecting section 322. The narrowing 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 external tube 40. The outer diameter of the second connecting section 322 is larger than the outer diameter of the narrowing section 31. The corresponding fit between the second connecting section 322 and the outer side of the external tube 40 can reduce the difference between the outer diameters of the narrowing section 31 and the external tube 40, thereby reducing the change in the flow cross-section when the fluid flows through the first sleeve 32 and the external tube 40, further improving the stability of the fluid flow within the switching valve.

[0050] Specifically, the necked section 31 further includes a second stop structure 313, which is disposed between the middle section 312 and the second connecting section 322. The second stop structure 313 can limit the assembly position of the external tube 40 on the second connecting section 322, thereby preventing damage to the first sleeve 32 or the external tube 40 caused by over-assembly of the external tube 40 and the second connecting section 322 during installation, thereby effectively improving the assembly efficiency of the first sleeve 32 and the external tube 40.

[0051] The specific structures of the first stop structure 311 and the second stop structure 313 are not limited, and they can be configured as a conical structure or a protruding structure extending toward the interior of the sleeve 30 .

[0052] 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 sleeved onto 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 connects the second connecting pipe 22 to the external pipe 40, allowing the second connecting pipe 22 to be assembled with external pipes 40 of different sizes, thereby improving the applicability and practicality of the switching valve.

[0053] Preferably, 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. 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.

[0054] like Figure 5 As shown, the constricted section 31 further comprises a first tapered section and a second tapered section. One end of the first tapered section is connected to the middle section 312, and the other end is connected to the first connecting section 321. The inner diameter of the first tapered section gradually increases from the middle section 312 toward the first connecting section 321, forming a first stop structure 311. One end of the second tapered section is connected to the middle section 312, and the other end is connected to the second connecting section 322. The inner diameter of the second tapered section gradually increases from the middle section 312 toward the second connecting section 322, forming a second stop structure 313. Designating the stop structure as a tapered section not only facilitates assembly of the sleeve 30 but also provides buffering and guidance for fluid passing through pipe sections of different diameters, preventing blockage when the fluid flows through different pipe sections, improving fluid flow, and ensuring the fluid flow rate within the switching valve. Furthermore, the tapered structure is simple to manufacture, saving production costs.

[0055] In other embodiments, the necked section 31 includes a first tapered section, and the second stop structure 313 is other structures.

[0056] In another embodiment of the present application, the necked section 31 includes a second tapered section, and the first stop structure 311 is another structure.

[0057] like Figure 5 and Figure 6 As shown, the outer diameter of the necking 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. When B1<D+2t, the outer diameter of the necking section 31 is too small and throttling may occur, resulting in too small a flow rate of the fluid through the necking section 31, affecting the normal operation of the switching valve. Therefore, in the present application, B1≥D+2t, which can not only increase the spacing between adjacent sleeves 30 and reduce the risk of welding adjacent copper sleeves, but also avoid throttling of the sleeve 30, thereby ensuring the flow rate of the fluid in the switching valve. Among them, there is no limitation on the inner diameter of the first connecting pipe 21 being D and the wall thickness of the first sleeve 32 being t, and they can be selected and adjusted according to the actual use scenario of the switching valve.

[0058] In another embodiment of the present application, Figure 7 As shown, 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 close to the valve body 10 and the valve body 10 is H1, and the distance between the end of the first connecting section 321 close to the valve body 10 and the valve body 10 is H2, and H1 ≥ H2. Compared with the prior art, Figure 2 As shown, the distance between the bottom end surface of the E copper sleeve 104 and the C copper sleeve 106 and the valve body 100 is H3, and the distance between the bottom end surface of the S copper sleeve 105 and the valve body 100 is H4, H3<H4. In the welding process of the external pipe and the copper sleeve, the middle external pipe and the S copper sleeve 105 are welded first, and then the external pipes and the copper sleeves on both sides are welded. When welding the external pipes on both sides to the E copper sleeve 104 and the C copper sleeve 106, it is necessary to heat the entire E copper sleeve 104 and the C copper sleeve 106 by a heating method such as flame welding. In the heating process, the adjacent pipes in the middle will inevitably be heated. Figure 2 As shown, when the bottom end surfaces of the E copper sleeve 104 and the C copper sleeve 106 are heated, the S pipe 102 will be heated. Copper has better thermal conductivity than steel. The S pipe 102 is made of steel and has poor thermal conductivity. It cannot quickly conduct heat away, which can easily lead to local overheating and accumulation of the S pipe 102 and overburning. Through the above-mentioned arrangement, when the second sleeve 33 is heated, the adjacent pipe is the first sleeve 32 made of copper. The heat can be promptly conducted away from the first sleeve 32, avoiding the situation where the first connecting pipe 21, which would cause local heat accumulation in the first connecting pipe 21 and lead to overburning, occurs when the adjacent pipe is the first connecting pipe 21 made of steel.

[0059] In this embodiment, there is no limitation on the welding process of the sleeve 30 , the connecting pipe 20 and the external pipe 40 , and other welding processes such as brazing, laser welding, ultrasonic welding, and flame welding may be used.

[0060] like Figure 6 As shown, 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 outside the third connecting pipe 23. The projection of the end of the third sleeve 34 distal to the third connecting pipe 23 in the direction of extension of the valve body 10 is located within the projection of the middle section 312 in the direction of extension of the valve body 10. The projection of the third sleeve 34 in the direction of extension of the valve body 10 is located within the projection of the first sleeve 32 in the direction of extension of the valve body 10. This arrangement reduces the risk of the third sleeve 34 welding to the first sleeve 32 during welding heating. When the third sleeve 34 is heated, the heat can be promptly transferred away from the first sleeve 32 if the adjacent pipe is made of copper. This avoids the situation where localized heat accumulation in the first connecting pipe 21, which can cause overheating, occurs when the adjacent pipe is made of steel.

[0061] 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, and 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 surface of the adjacent sleeve 30 is A2, where A2 = L2-(B / 2)-(B1 / 2). In the prior art, Figure 2 As shown, the outer diameter of each copper sleeve is B3, where B3 = B. The distance between adjacent copper sleeve axes is L1, and the distance between adjacent copper sleeves is A1, where A1 = L1 - (B3 / 2) - (B3 / 2). Since A2 is greater than A1, the present invention increases the spacing between adjacent sleeves 30 by providing the tapered section 31, reducing the risk of welding between adjacent sleeves 30.

[0062] like Figure 7 As shown, the second embodiment of the present application provides a switching valve. Unlike the first embodiment, the constricted section 31 is an arc-shaped section. This can reduce the impact force of the fluid on the constricted section 31, reduce the energy loss of the fluid, further improve the continuity of the fluid flow through the sleeve 30, and increase the flow rate of the fluid.

[0063] The specific shape of the arc segment is not limited. In this embodiment, B2>B, and the arc segment has an asymmetric structure. In other embodiments, B2<B, and the arc segment has an asymmetric structure. In another embodiment of the present application, B2=B, and the arc segment has a symmetric structure.

[0064] The connecting tubes 20 and corresponding sleeves 30 together form a flow channel that communicates with the valve cavity. The switching valve has multiple flow channels, each with an equal minimum flow area. This arrangement ensures smooth fluid flow between each connecting tube 20 and sleeve 30, thereby improving the continuity of fluid flow and the operating efficiency of the valve body 10.

[0065] In the present application, the inner diameters of the ends of the multiple sleeves 30 away from the connecting pipes 20 are all the same. This ensures that the flow cross-sections of the fluid in each connecting pipe 20 on the valve body 10 are the same when flowing through the corresponding sleeve 30, thereby preventing the fluid from flowing through different connecting pipes 20 and sleeves 30 due to excessive changes in inner diameter, which may affect the stability of the fluid pressure or flow rate.

[0066] 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.

[0067] Unless otherwise specifically stated, 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 invention. 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 actual proportional relationships. The 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 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 the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0068] In the description of the present invention, it needs to 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 drawings. They are only for the convenience of describing the present invention 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 the present invention; the directional words "inside and outside" refer to the inside and outside relative to the outline of each component itself.

[0069] 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.

[0070] In addition, it should be noted that the use of words such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above words have no special meaning and therefore cannot be understood as limiting the scope of protection of this utility model.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A switching valve, characterized in that: The switching valve comprises: A valve body (10) having a valve cavity, the valve body (10) comprising a plurality of connecting pipes (20) arranged side by side along an extension direction of the valve body (10), the plurality of connecting pipes (20) all being in communication with the valve cavity; A plurality of sleeves (30) are arranged side by side, the sleeves (30) are arranged in one-to-one correspondence with the connecting pipes (20), a portion of the sleeve (30) is sleeved on the outside of the corresponding connecting pipe (20), and the sleeve (30) is used to connect the connecting pipe (20) with the external pipe (40); Among the two adjacent sleeves (30), one of the sleeves (30) has a necking 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 necking 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 the necking section (31) connected in sequence. The first connecting section (321) is connected to the outer side of the first connecting pipe (21), and the outer diameter of the first connecting section (321) is greater than the outer diameter of the necking section (31).

3. The switching valve according to claim 2, characterized in that The necking section (31) comprises a first stop structure (311) and a middle section (312) which are arranged in sequence, and the first stop structure (311) is arranged between the middle 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 necking section (31) is arranged between the first connecting section (321) and the second connecting section (322), the second connecting section (322) is connected to the external tube (40), the outer diameter of the second connecting section (322) is greater than the outer diameter of the necking section (31), the necking section (31) further includes a second stop structure (313), and the second stop structure (313) is arranged between the middle 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). Part of the second sleeve (33) is sleeved on the outside of the second connecting pipe (22), and 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 necking section (31) further comprises: a first conical section, one end of the first conical section being connected to the middle section (312), the other end of the first conical section being connected to the first connecting section (321), the inner diameter of the first conical section gradually increasing from the middle section (312) toward the first connecting section (321), the first conical section forming the first stop structure (311), and / or; A second conical section, one end of the second conical section is connected to the middle section (312), the other end of the second conical section is connected to the second connecting section (322), the inner diameter of the second conical section gradually increases from the middle section (312) to the second connecting section (322), and the second conical section forms the second stop structure (313).

7. The switching valve according to claim 2, characterized in that: The outer diameter of the necked 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, wherein: The necking 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). Part of the pipe section 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, wherein: The inner diameters of the ends of the plurality of sleeves (30) away from the connecting pipe (20) are all the same.

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