Switching valve

Abstract

The utility model provides a switching valve which comprises a valve body provided with a valve cavity, the valve body comprises a plurality of connecting pipes arranged side by side in the extending direction of the valve body, and the connecting pipes are all 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, the sleeves and the corresponding connecting pipes are mutually nested, and the sleeves are used for communicating the connecting pipes with external pipes; according to the two adjacent sleeves, part of the pipe section of one sleeve is arranged on the outer side of the corresponding connecting pipe in a sleeving mode, part of the pipe section of the other sleeve is located on the inner side of the corresponding connecting pipe, and the projections of the parts, located outside the connecting pipes, of the 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 of the switching valve in the prior art are easily welded can be solved.

Description

Technical Field

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

[0002] A switching valve is a control valve with multiple connection ports, usually composed of a valve body, a valve core, a valve seat and multiple connecting pipes. By moving the valve core, the switching of fluid between multiple connecting pipes is changed, so as to change the flow direction of the fluid, which is an indispensable component in refrigeration equipment.

[0003] At present, the connecting pipes on the switching valve are connected to the external connecting pipes through copper sleeves. In this way, when welding the external connecting pipes, it is easy for the adjacent two copper sleeves to be welded together after being heated, resulting in the deformation of the copper sleeves. Summary of the Utility Model

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

[0005] The utility model provides a switching valve, which includes: a valve body having a valve cavity, the valve body includes a plurality of connecting pipes arranged side by side along the extending direction of the valve body, and the plurality of connecting pipes are all communicated with the valve cavity; a plurality of sleeves arranged side by side, the sleeves are arranged in one-to-one correspondence with the connecting pipes, the sleeves and the corresponding connecting pipes are nested with each other, and the sleeves are used to communicate the connecting pipes with the external connecting pipes; wherein, among the adjacent two sleeves, a partial pipe section of one sleeve is sleeved outside the corresponding connecting pipe, and a partial pipe section of the other sleeve is located inside the corresponding connecting pipe, and the projections of the parts of the adjacent two sleeves outside the connecting pipe in the extending direction of the valve body at least partially overlap.

[0006] By applying the technical solution of the utility model, a plurality of connecting pipes are arranged side by side along the extending direction of the valve body, the sleeves and the corresponding connecting pipes are nested with each other, and the sleeves are used to communicate the connecting pipes with the external connecting pipes. Among them, for the adjacent two sleeves, a partial pipe section of one sleeve is sleeved outside the corresponding connecting pipe, and a partial pipe section of the other sleeve is located inside the corresponding connecting pipe. Through the above setting, when heating and welding the sleeves and the connecting pipes or the sleeves and the external connecting pipes, compared with the prior art in which the adjacent sleeves are all sleeved outside the connecting pipe side by side, resulting in a small distance between the adjacent sleeves, the above structure of the present application can increase the distance between the sleeves corresponding to the adjacent connecting pipes, thereby reducing the risk of welding between the adjacent sleeves, and thus ensuring the assembly accuracy of the connecting pipes and the sleeves, so as to improve the use performance and working efficiency of the whole switching valve.

[0007] Furthermore, the inner diameters of the ends of the plurality of sleeves far away from the connecting pipes are the same. Through the above setting, it can make the flow cross-sections of the fluids in the respective connecting pipes on the valve body the same when flowing through the corresponding sleeves, improving the smoothness and stability of the fluid flowing in different pipelines.

[0008] Further, the sleeve includes a first sleeve, the connecting pipe includes a first connecting pipe, the first sleeve includes a first section and a second section connected in sequence, the first section is connected to the inner side of the first connecting pipe, the second section is arranged away from the first connecting pipe, and the second section is used for connecting with an external connecting pipe. The inner diameter of the first section is smaller than that of the second section. Through the above arrangement, the change in the inner diameter of the fluid when passing through the first connecting pipe and the first sleeve can be reduced, thereby ensuring the stability of the fluid flowing in different pipelines, and further meeting the requirements of the valve body for the fluid flow rate and flow volume.

[0009] Further, the connecting pipe further includes a second connecting pipe, the second connecting pipe is arranged side by side with the first connecting pipe along the extending direction of the valve body, the sleeve further includes a second sleeve, and a partial pipe section of the second sleeve is sleeved outside the second connecting pipe. Through the above arrangement, the distance between the second sleeve and the first sleeve is increased, so that when heating and welding the second sleeve or the first sleeve, the risk of welding the second sleeve and the first sleeve together can be reduced.

[0010] Further, the projection of the second sleeve on the first sleeve is not higher than the top of the first section of the first sleeve. Through the above arrangement, the heat transfer and influence of the second sleeve on the first sleeve during heating can be reduced, further reducing the possibility of welding the second sleeve and the first sleeve together, so as to improve the welding efficiency of the sleeve.

[0011] Further, the projection of the second sleeve on the first sleeve is not lower than the bottom of the first section of the first sleeve. Through the above arrangement, when the heat generated during heating of the second sleeve is transferred to the first connecting pipe, the first connecting pipe can timely export the heat through the first section of the first sleeve, avoiding local overheating of the first connecting pipe.

[0012] Further, the first connecting pipe includes a third section and a fourth section connected in sequence, the third section is connected to the valve body, the fourth section is sleeved outside the first section of the first sleeve, the inner diameter of the fourth section is larger than that of the third section, a first stop structure is arranged between the third section and the fourth section, and a second stop structure is arranged between the first section and the second section. Through the above arrangement, the first stop structure can limit the relative position of the first sleeve and the first connecting pipe in the axial direction, avoiding excessive assembly of the first section and the first connecting pipe; the second stop structure can avoid excessive assembly of the external connecting pipe and the first sleeve, and at the same time fixes the assembly position of the external connecting pipe, improving the assembly efficiency of the first sleeve and the external connecting pipe.

[0013] Further, the switching valve further includes: a first tapered section disposed on the first connecting pipe, one end of the first tapered section is connected to the third section, the other end of the first tapered section is connected to the fourth section, the diameter of the first tapered section gradually increases from the third section to the fourth section, and the first tapered section forms a first stop structure, and / or; a second tapered section disposed on the first sleeve, one end of the second tapered section is connected to the first section, the other end of the second tapered section is connected to the second section, the diameter of the second tapered section gradually increases from the first section to the second section, and the second tapered section forms a second stop structure. Through the above arrangement, the first tapered section and the second tapered section can guide the flow of the fluid, and the change in diameter in the tapered section can increase the flow rate of the fluid, thereby increasing the flow rate of the fluid in the pipeline.

[0014] Further, the connecting pipe further includes a third connecting pipe, and the sleeve further 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. A partial pipe section of the third sleeve is sleeved outside the third connecting pipe. The projection of the third sleeve on the first sleeve is not higher than the top of the first section of the first sleeve, and the projection of the third sleeve on the first sleeve is not lower than the bottom of the first section of the first sleeve. Through the above arrangement, local overheating of the first connecting pipe can be avoided, and the heat transfer and influence of the third sleeve on the first sleeve during heating can be reduced, further reducing the possibility of welding the third sleeve to the first sleeve, so as to improve the welding efficiency of the sleeve.

[0015] Further, the connecting pipe further includes a fourth connecting pipe, and the sleeve further includes a fourth sleeve. The fourth connecting pipe is arranged side by side with the first connecting pipe and the second connecting pipe. The second connecting pipe is located between the first connecting pipe and the fourth connecting pipe. The fourth sleeve includes a fifth section and a sixth section connected in sequence. The fifth section is connected to the inside of the fourth connecting pipe, and the sixth section is arranged away from the fourth connecting pipe. The sixth section is used to connect to an external pipe. The inner diameter of the fifth section is smaller than the inner diameter of the sixth section; the fourth connecting pipe includes a seventh section and an eighth section connected in sequence. The seventh section is connected to the valve body, and the eighth section is sleeved outside the fifth section. The inner diameter of the eighth section is larger than the inner diameter of the seventh section. A third stop structure is arranged between the seventh section and the eighth section, and a fourth stop structure is arranged between the fifth section and the sixth section.

[0016] Further, the second sleeve includes a ninth section and a tenth section connected in sequence. The ninth section is sleeved outside the second connecting pipe, and the tenth section is arranged away from the second connecting pipe. The tenth section is used to connect to an external pipe. The inner diameter of the ninth section is smaller than the inner diameter of the tenth section.

[0017] Further, the projections of the fourth connecting sleeve and the first sleeve on the second sleeve are not higher than the top of the ninth section.

[0018] Further, the projections of the fourth connecting pipe and the first connecting pipe on the second sleeve are not lower than the bottom of the second sleeve.

[0019] Further, the connecting pipe and the corresponding sleeve jointly form a flow passage, the flow passage communicates with the valve cavity, the switching valve has a plurality of flow passages, and the minimum flow areas of the plurality of flow passages are all equal. Through the above settings, the continuity of the fluid flowing between each connecting pipe and the sleeve can be further improved, thereby improving the overall performance of the valve body device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 shows an assembly schematic diagram of a switching valve in the prior art;

[0022] Figure 2 shows a front view of the switching valve provided in Embodiment 1 of the present invention;

[0023] Figure 3 shows a top view of the switching valve provided in Embodiment 1 of the present invention;

[0024] Figure 4 shows Figure 3 a sectional view taken along line B-B in

[0025] Figure 5 shows an assembly schematic diagram of a connecting pipe and a sleeve provided in Embodiment 1 of the present invention;

[0026] Figure 6 shows an assembly schematic diagram of a first connecting pipe and a first sleeve provided in Embodiment 1 of the present invention;

[0027] Figure 7 shows an assembly schematic diagram of a connecting pipe and a sleeve provided in Embodiment 2 of the present invention.

[0028] Among them, the above-mentioned drawings include the following reference numerals:

[0029] 10, valve body;

[0030] 20, connecting pipe;

[0031] 21, first connecting pipe; 211, third section; 212, fourth section;

[0032] 22, second connecting pipe;

[0033] 23, third connecting pipe;

[0034] 24, fourth connecting pipe; 241, seventh section; 242, eighth section;

[0035] 30. Sleeve;

[0036] 31. First sleeve; 311. First section; 312. Second section;

[0037] 32. Second sleeve; 321. Ninth section; 322. Tenth section;

[0038] 33. Third sleeve;

[0039] 34. Fourth sleeve; 341. Fifth section; 342. Sixth section;

[0040] 40. Outer connecting pipe;

[0041] 51. First conical section; 52. Second conical section; 53. Third conical section;

[0042] 1a. E connecting pipe; 2a. S connecting pipe; 3a. C connecting pipe;

[0043] 1b. E copper sleeve; 2b. S copper sleeve; 3b. C copper sleeve. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way constitutes a limitation on the present invention and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0045] As Figures 2 to 4 shown, an 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, having a valve cavity. The valve body 10 includes a plurality of connecting pipes 20 arranged side by side along the extending direction of the valve body 10, and the plurality of connecting pipes 20 are all communicated with the valve cavity. The sleeves 30 are arranged in one-to-one correspondence with the connecting pipes 20, the sleeves 30 and the corresponding connecting pipes 20 are nested with each other, and the sleeves 30 are used to communicate the connecting pipes 20 with the outer connecting pipe 40. Among them, in two adjacent sleeves 30, a partial pipe section of one sleeve 30 is sleeved outside the corresponding connecting pipe 20, and a partial pipe section of the other sleeve 30 is located inside the corresponding connecting pipe 20. The parts of the two adjacent sleeves 30 outside the connecting pipe 20 overlap at least partially in the extending direction of the valve body 10.

[0046] Applying the technical solution of the present utility model, a plurality of connecting pipes 20 are arranged side by side along the extending direction of the valve body 10. The sleeve 30 is nested with the corresponding connecting pipe 20, and the sleeve 30 is used to connect the connecting pipe 20 with the external connecting pipe 40. Among them, for two adjacent sleeves 30, a partial pipe section of one sleeve 30 is sleeved outside the corresponding connecting pipe 20, and a partial pipe section of the other sleeve 30 is located inside the corresponding connecting pipe 20. Through the above arrangement, when heating and welding the sleeve 30 and the connecting pipe 20 or the sleeve 30 and the external connecting pipe 40, compared with the prior art where adjacent sleeves are all sleeved side by side outside the connecting pipe, resulting in a smaller distance between adjacent sleeves, the above structure of the present application can increase the distance between the sleeves 30 corresponding to adjacent connecting pipes 20, thereby reducing the risk of welding connection between adjacent sleeves 30, and thus can ensure the assembly accuracy of the connecting pipe 20 and the sleeve 30, so as to improve the service performance and working efficiency of the entire switching valve.

[0047] Among them, the sleeve 30 and the external connecting pipe 40 are made of copper, and the connecting pipe 20 is made of stainless steel. The sleeve 30 is welded to the connecting pipe 20 and the external connecting pipe 40 by a brazing process. The thermal conductivity of copper is better than that of stainless steel. In this way, during welding, the sleeve 30 can also timely conduct the heat on the connecting pipe 20, avoiding damage to the connecting pipe 20 caused by excessive temperature.

[0048] Specifically, the inner diameters of the ends of a plurality of sleeves 30 far from the connecting pipe 20 are the same. Through the above arrangement, it can be ensured that the flow cross-sections of the fluids in the respective connecting pipes 20 on the valve body 10 are the same when flowing through the corresponding sleeves 30, thereby avoiding the influence on the stability of the fluid pressure or flow rate due to excessive change in the inner diameter when the fluid flows in the respective connecting pipes 20 and sleeves 30. And such an arrangement can also ensure that the outer diameters of the external connecting pipes 40 connected to the sleeves 30 are the same, avoiding too large a difference in the inner diameters between different pipelines, and further improving the smoothness and stability of the fluid flowing in different pipelines.

[0049] Such as Figures 3 to 5As shown, the sleeve 30 includes a first sleeve 31, the connecting pipe 20 includes a first connecting pipe 21, the first sleeve 31 includes a first section 311 and a second section 312 connected in sequence. The first section 311 is connected to the inner side of the first connecting pipe 21, the second section 312 is arranged away from the first connecting pipe 21, and the second section 312 is used to connect to the external connecting pipe 40. The inner diameter of the first section 311 is smaller than the inner diameter of the second section 312. Through the above arrangement, although the first section 311 of the first sleeve 31 is located inside the corresponding first connecting pipe 21 and the inner diameter of the first section 311 is smaller than the inner diameter of the first connecting pipe 21, the inner diameter of the second section 312 is larger than the inner diameter of the first section 311. In this way, the change in the inner diameter of the fluid when passing through the first connecting pipe 21 and the first sleeve 31 can be reduced, thereby ensuring the stability of the fluid flowing in different pipelines, and further meeting the requirements of the valve body 10 for the fluid flow rate and flow volume.

[0050] In the present application, the connecting pipe 20 further includes a second connecting pipe 22. The second connecting pipe 22 is arranged side by side with the first connecting pipe 21 along the extending direction of the valve body 10. The sleeve 30 further includes a second sleeve 32. A partial pipe section of the second sleeve 32 is sleeved outside the second connecting pipe 22, and another part of the second sleeve 32 is used to connect to the external connecting pipe 40. Through the above arrangement, a partial pipe section of the second sleeve 32 is sleeved outside the second connecting pipe 22, and a part of the first sleeve 31 is located inside the first connecting pipe 21. In this way, the distance between the second sleeve 32 and the first sleeve 31 is increased. In this way, when heating and welding the second sleeve 32 or the first sleeve 31, the risk of welding the second sleeve 32 and the first sleeve 31 together can be reduced.

[0051] Specifically, the second connecting pipe 22 is in abutting connection with the corresponding external connecting pipe 40. In this way, it can be avoided that the fluid flows out from the gap between the second connecting pipe 22 and the external connecting pipe 40, and at the same time, it ensures that the fluid smoothly passes through the connection between the second connecting pipe 22 and the external connecting pipe 40.

[0052] As Figures 4 to 6 shown, the projection of the second sleeve 32 on the first sleeve 31 is not higher than the top of the first section 311 of the first sleeve 31. The shortest distance between the end of the second sleeve 32 and the first sleeve 31 is A1. Compared with the prior art, as Figure 1As shown, the E copper sleeve 1b, the S copper sleeve 2b, and the C copper sleeve 3b are respectively sleeved on the outer peripheries of the E connecting pipe 1a, the S connecting pipe 2a, and the C connecting pipe 3a. The distance between adjacent copper sleeves is A. The copper sleeves are all sleeved on the outer sides of the corresponding connecting pipes. In this way, the distance between adjacent copper sleeves is too small. When welding the outer connecting pipe, the solder may overflow from the upper ends of the E copper sleeve 1b and the C copper sleeve 3b, and the possibility of welding between adjacent copper sleeves is relatively high. Through the above settings in this application, this distance can be increased, so that the minimum distance between the second sleeve 32 and the first sleeve 31 is increased from A to the distance A1 between the second sleeve 32 and the second tapered section 52. In this way, the heat transfer and influence of the second sleeve 32 on the first sleeve 31 during heating can be reduced, and the possibility of welding between the second sleeve 32 and the first sleeve 31 can be further reduced to improve the welding efficiency of the sleeve 30.

[0053] Specifically, the projection of the second sleeve 32 on the first sleeve 31 is not lower than the bottom of the first section 311. The distance between the bottom of the second sleeve 32 and the valve body 10 is H1, and the distance between the end of the first section 311 of the first sleeve 31 away from the second section 312 and the valve body 10 is H2, and H1≥H2. Compared with the prior art, the distance between the bottom end surface of the S copper sleeve 2b and the valve body 10 is H6, and the distance between the bottom end surfaces of the E copper sleeve 1b and the C copper sleeve 3b and the valve body 10 is H5, and H5 is less than H6. During the welding heating process, after the heat at the lower end surface of the E copper sleeve 1b is transferred to the S connecting pipe 2a, the S connecting pipe 2a has poor thermal conductivity and cannot quickly export the heat, which easily causes local overheating of the S connecting pipe 2a. Through the above settings, when the heat generated during the flame welding of the second sleeve 32 is transferred to the first connecting pipe 21, the first connecting pipe 21 can timely export the heat through the first section 311 of the first sleeve 31, avoiding local overheating of the first connecting pipe 21.

[0054] Among them, the first connecting pipe 21 includes a third section 211 and a fourth section 212 connected in sequence. The third section 211 is connected to the valve body 10, and the fourth section 212 is sleeved on the outer side of the first section 311 of the first sleeve 31. The inner diameter of the fourth section 212 is larger than the inner diameter of the third section 211. With such a setting, the fourth section 212 can further prevent the flow cross-section from changing too much when the fluid flows from the third section 211 to the first section 311 of the first sleeve 31, so that the fluid can smoothly pass through the connection between the first connecting pipe 21 and the first sleeve 31, and further improve the stability and smoothness of the fluid flowing in the pipeline to ensure the working efficiency of the valve body 10.

[0055] Further, a first stop structure is provided between the third section 211 and the fourth section 212, and a second stop structure is provided between the first section 311 and the second section 312. Through the above arrangement, the first stop structure can limit the relative position of the first sleeve 31 and the first connecting pipe 21 in the axial direction, preventing excessive assembly of the first section 311 and the first connecting pipe 21. At the same time, the assembly position of the first sleeve 31 is fixed, improving the assembly efficiency of the first sleeve 31 and the first connecting pipe 21. The second stop structure can limit the relative position of the first sleeve 31 and the corresponding external connecting pipe 40 in the axial direction, preventing excessive assembly of the external connecting pipe 40 and the first sleeve 31. At the same time, the assembly position of the external connecting pipe 40 is fixed, improving the assembly efficiency of the first sleeve 31 and the external connecting pipe.

[0056] As Figure 6 shown, in this embodiment, the switching valve further includes: a first tapered section 51 and a second tapered section 52. Among them, the first tapered section 51 is provided on the first connecting pipe 21. One end of the first tapered section 51 is connected to the third section 211, and the other end of the first tapered section 51 is connected to the fourth section 212. The diameter of the first tapered section 51 gradually increases from the third section 211 to the fourth section 212, and the first tapered section 51 forms the first stop structure. The second tapered section 52 is provided on the first sleeve 31. One end of the second tapered section 52 is connected to the first section 311, and the other end of the second tapered section 52 is connected to the second section 312. The diameter of the second tapered section 52 gradually increases from the first section 311 to the second section 312, and the second tapered section 52 forms the second stop structure. Through the above arrangement, the first tapered section 51 and the second tapered section 52 can guide the flow of the fluid, and the change in diameter in the tapered section can increase the flow rate of the fluid, thereby increasing the flow velocity of the fluid in the pipeline. At the same time, the tapered structure is more convenient to process than the right-angle structure, saving the production cost of the device.

[0057] In other embodiments of the present application, it may also be that the first stop structure is the first tapered section and the second stop structure is other structures; or the second stop structure is the second tapered section 52 and the first stop structure is other structures.

[0058] In the present application, the specific forms of the first stop structure and the second stop structure are not limited. The stop structure can be set as a limiting plate structure extending outward in the circumferential direction, or a convex structure extending inward in the circumferential direction.

[0059] As Figure 4 and Figure 5As shown, the connecting pipe 20 further includes a third connecting pipe 23, and the sleeve 30 further includes a third sleeve 33. 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 33 is sleeved on the outside of the third connecting pipe 23. The projection of the third sleeve 33 on the first sleeve 31 is not higher than the top of the first section 311 of the first sleeve 31. Compared with the prior art, such a configuration is Figure 1 As shown, the distance between adjacent copper sleeves is too small. When welding the external tube, the solder may overflow from the upper ends of the E copper sleeve 1b and the C copper sleeve 3b, and the possibility of welding between adjacent copper sleeves is relatively large. The present application can increase the distance through the above-mentioned setting, thereby reducing the heat transfer and influence of the third sleeve 33 on the first sleeve 31 when it is heated, further reducing the possibility of welding between the third sleeve 33 and the first sleeve 31, and improving the welding efficiency of the sleeve 30.

[0060] Furthermore, the projection of the third sleeve 33 on the first sleeve 31 is not lower than the bottom of the first section 311 of the first sleeve 31. In this way, the heat generated when the third sleeve 33 is heated can be discharged through the first sleeve 31, and the heat transferred to the first connecting pipe 21 can also be discharged in time through the first section 311 of the first sleeve 31, thereby avoiding local overheating of the first connecting pipe 21.

[0061] like Figure 4 and Figure 7 As shown, a switching valve is provided in the second embodiment of the present application, which is different from the above embodiment in that the connecting pipe 20 further includes a fourth connecting pipe 24, the sleeve 30 further includes a fourth sleeve 34, the fourth connecting pipe 24 is arranged side by side with the first connecting pipe 21 and the second connecting pipe 22, the second connecting pipe 22 is located between the first connecting pipe 21 and the fourth connecting pipe 24, the fourth sleeve 34 includes a fifth section 341 and a sixth section 342 connected in sequence, the fifth section 341 is connected to the inner side of the fourth connecting pipe 24, the sixth section 342 is arranged away from the fourth connecting pipe 24, the sixth section 342 is used to connect to the external pipe 40, and the inner diameter of the fifth section 341 is smaller than the inner diameter of the sixth section 342. In this way, the change in the inner diameter of the fluid when passing through the fourth connecting pipe 24 and the fourth sleeve 34 can be reduced to ensure the stability of the fluid flowing in different pipelines, thereby meeting the requirements of the valve body 10 for the fluid flow rate and flow rate.

[0062] Among them, the fourth connecting pipe 24 includes a seventh section 241 and an eighth section 242 connected in sequence. The seventh section 241 is connected to the valve body 10. The eighth section 242 is sleeved outside the fifth section 341. The inner diameter of the eighth section 242 is larger than that of the seventh section 241. A third stop structure is provided between the seventh section 241 and the eighth section 242, and a fourth stop structure is provided between the fifth section 341 and the sixth section 342. In this way, the eighth section 242 can further prevent the flow cross-section from changing too much when the fluid flows from the seventh section 241 to the fifth section 341 of the fourth sleeve 34, so that the fluid can smoothly pass through the connection between the fourth connecting pipe 24 and the fourth sleeve 34, and further improve the stability and smoothness of the fluid flowing in the pipeline, so as to ensure the working efficiency of the valve body 10. In this embodiment, the structure of the first connecting pipe 21 is the same as that of the fourth connecting pipe 24.

[0063] Further, a third stop structure is provided between the fifth section 341 and the sixth section 342. In this way, the third stop structure can limit the relative position of the fourth sleeve 34 and the fourth connecting pipe 24 in the axial direction, prevent the fifth section 341 from being over-assembled with the fourth connecting pipe 24, and at the same time fix the assembly position of the fourth sleeve 34, improving the assembly efficiency of the fourth sleeve 34 and the fourth connecting pipe 24. A fourth stop structure is provided between the seventh section 241 and the eighth section 242. In this way, the fourth stop structure can limit the relative position of the fourth sleeve 34 and the corresponding external connecting pipe 40 in the axial direction, prevent the external connecting pipe 40 from being over-assembled with the fourth sleeve 34, and at the same time fix the assembly position of the external connecting pipe 40, improving the assembly efficiency of the fourth sleeve 34 and the external connecting pipe. Among them, the specific forms of the third stop structure and the fourth stop structure are not limited, and can be a conical structure, a convex structure or a plate-like structure.

[0064] Further, the second sleeve 32 includes a ninth section 321 and a tenth section 322 connected in sequence. The ninth section 321 is sleeved outside the second connecting pipe 22. The tenth section 322 is arranged away from the second connecting pipe 22 and is used to connect with the external connecting pipe 40. The inner diameter of the ninth section 321 is smaller than that of the tenth section 322. In this way, it can reduce the change in the inner diameter of the fluid when passing through the second connecting pipe 22 and the second sleeve 32, so as to ensure the stability of the fluid flowing in different pipelines, and further meet the requirements of the valve body 10 for the fluid flow rate and flow rate.

[0065] In the present application, a fifth stop structure is provided between the ninth section 321 and the tenth section 322. With the above arrangement, the fifth stop structure can limit the relative axial position between the second sleeve 32 and the corresponding outer connecting pipe 40, prevent the over-assembly of the outer connecting pipe 40 and the second sleeve 32, and at the same time fix the assembly position of the outer connecting pipe 40, improving the assembly efficiency of the second sleeve 32 and the outer connecting pipe. Among them, the specific form of the fifth stop structure is not limited, and it can be a conical structure, a convex structure or a plate-like structure.

[0066] Specifically, as Figure 7 shown, the switching valve further includes a third conical section 53. The third conical section 53 is arranged on the second sleeve 32. One end of the third conical section 53 is connected to the ninth section 321, and the other end of the third conical section 53 is connected to the tenth section 322. The diameter of the third conical section 53 gradually increases from the ninth section 321 to the tenth section 322, and the third conical section 53 forms the fifth stop structure.

[0067] Specifically, as Figure 1 、 Figure 6 and Figure 7 shown, the projections of the fourth sleeve 34 and the first sleeve 31 on the second sleeve 32 are not higher than the top of the ninth section 321. The minimum distance between adjacent sleeves is the distance between the end face of the sixth section 342 and the third conical section 53 and the distance between the end of the second section 312 and the third conical section 53, which is A2. With the above arrangement, compared with the prior art, as Figure 1 shown, the distance between adjacent copper sleeves is A, and the copper sleeves are all sleeved on the outside of the corresponding connecting pipes. In this way, the distance between adjacent copper sleeves is too small, and when welding the outer connecting pipe, the solder may overflow from the upper ends of the E copper sleeve 1b and the C copper sleeve 3b, and the possibility of welding between adjacent copper sleeves is relatively large. Through the above arrangement, the present application can increase this distance, ensuring that the minimum distance between the fourth sleeve 34, the first sleeve 31 and the second sleeve 32 increases from A to A2. In this way, the heat transfer and influence of the fourth sleeve 34 and the first sleeve 31 on the second sleeve 32 during heating can be reduced, and the possibility of welding between the fourth sleeve 34, the first sleeve 31 and the second sleeve 32 can be further reduced, so as to improve the welding efficiency of the sleeve 30.

[0068] Among them, the projections of the fourth connecting pipe 24 and the first connecting pipe 21 on the second sleeve 32 are not lower than the bottom of the second sleeve 32. The distance between the end of the eighth section 242 of the fourth connecting pipe 24 away from the valve body 10 and the valve body 10 is H3, and the distance between the bottom of the ninth section 321 of the second sleeve 32 and the valve body 10 is H4, and H3≥H4. The distance between the bottom end face of the S copper sleeve 2b and the valve body 10 is H6, and the distance between the bottom end faces of the E copper sleeve 1b and the C copper sleeve 3b from the valve body 10 is H5, and H5≤H6. During the welding heating process, after the heat of the lower end face of the E copper sleeve 1b is transferred to the S connecting pipe 2a, the S connecting pipe 2a has poor thermal conductivity and cannot quickly export the heat, which easily causes local overheating of the S connecting pipe 2a. Through the above settings, when the exposed parts of the fourth sleeve 34 and the first sleeve 31 are heated by flame welding, the generated heat will be conducted to the ninth section 321 instead of the second connecting pipe 22, and the heat can be directly exported through the ninth section 321, avoiding local overheating of the second connecting pipe 22.

[0069] Specifically, the connecting pipe 20 and the corresponding sleeve 30 jointly form a flow channel, the flow channel is communicated with the valve cavity, the switching valve has a plurality of flow channels, and the minimum flow areas of the plurality of flow channels are all equal. With such settings, the continuity of the fluid flowing between the respective connecting pipes 20 and sleeves 30 can be further improved, thereby improving the overall performance of the valve body 10 device.

[0070] Through the technical solution provided by the present application, the following advantages are achieved:

[0071] 1. For adjacent sleeves, a partial pipe section of one sleeve is sleeved outside the corresponding connecting pipe, and a partial pipe section of the other sleeve is located inside the corresponding connecting pipe, increasing the distance between adjacent sleeves and reducing the risk of welding between adjacent sleeves;

[0072] 2. The distance between the bottom of the middle sleeve and the valve body is less than or equal to the distance between the heating parts of the two side sleeves and the valve body, preventing the middle sleeve from overheating when welding the two side sleeves.

[0073] 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 otherwise clearly specified in the context, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0074] Unless otherwise specifically stated, the relative arrangements, numerical expressions, and numerical values of the components and steps set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the description. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0075] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Without contrary statements, these orientation terms do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus should not be construed as limiting the protection scope of the present utility model; the orientation terms "inner, outer" refer to the inside and outside relative to the contour of each component itself.

[0076] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "above-mentioned", etc. can be used here to describe the spatial positional relationships of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation shown in the drawings of the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0077] In addition, it should be noted that the use of words such as "first", "second", etc. to limit components is only for the convenience of differentiating the corresponding components. Without additional statements, the above words have no special meanings, and thus should not be construed as limiting the protection scope of the present utility model.

[0078] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

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 extending direction of the valve body (10), the plurality of connecting pipes (20) being in communication with the valve cavity; A plurality of sleeves (30) arranged side by side, the sleeves (30) and the connecting pipes (20) being arranged in one-to-one correspondence, the sleeves (30) and the corresponding connecting pipes (20) being nested with each other, and the sleeves (30) being used to connect the connecting pipes (20) with an external pipe (40); Among them, among the two adjacent sleeves (30), a partial pipe section of one of the sleeves (30) is sleeved on the outer side of the corresponding connecting pipe (20), and a partial pipe section of the other sleeve (30) is located on the inner side of the corresponding connecting pipe (20), and the projections of the parts of the two adjacent sleeves (30) located outside the connecting pipe (20) in the extension direction of the valve body (10) at least partially overlap.

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

3. The switching valve according to claim 1, characterized in that: The sleeve (30) comprises a first sleeve (31), the connecting tube (20) comprises a first connecting tube (21), the first sleeve (31) comprises a first section (311) and a second section (312) connected in sequence, the first section (311) is connected to the inner side of the first connecting tube (21), the second section (312) is arranged away from the first connecting tube (21), the second section (312) is used to be connected to the external tube (40), and the inner diameter of the first section (311) is smaller than the inner diameter of the second section (312).

4. The switching valve according to claim 3, characterized in that: The connecting pipe (20) further comprises a second connecting pipe (22), the second connecting pipe (22) and the first connecting pipe (21) being arranged side by side along the extension direction of the valve body (10), and the sleeve (30) further comprises a second sleeve (32), a part of the second sleeve (32) being sleeved on the outside of the second connecting pipe (22).

5. The switching valve according to claim 4, characterized in that: The projection of the second sleeve (32) on the first sleeve (31) is no higher than the top of the first section (311) of the first sleeve (31).

6. The switching valve according to claim 4, characterized in that: The projection of the second sleeve (32) on the first sleeve (31) is not lower than the bottom of the first section (311) of the first sleeve (31).

7. The switching valve according to claim 3, characterized in that: The first connecting pipe (21) comprises a third section (211) and a fourth section (212) which are connected in sequence, the third section (211) being connected to the valve body (10), the fourth section (212) being sleeved on the outer side of the first section (311) of the first sleeve (31), the inner diameter of the fourth section (212) being larger than the inner diameter of the third section (211), a first stop structure being provided between the third section (211) and the fourth section (212), and a second stop structure being provided between the first section (311) and the second section (312).

8. The switching valve according to claim 7, characterized in that: The switching valve further comprises: a first tapered section (51) arranged on the first connecting pipe (21), one end of the first tapered section (51) being connected to the third section (211), the other end of the first tapered section (51) being connected to the fourth section (212), the diameter of the first tapered section (51) gradually increasing from the third section (211) toward the fourth section (212), the first tapered section (51) forming the first stop structure, and / or; A second conical section (52) is arranged on the first sleeve (31), one end of the second conical section (52) is connected to the first section (311), and the other end of the second conical section (52) is connected to the second section (312), the diameter of the second conical section (52) gradually increases from the first section (311) to the second section (312), and the second conical section (52) forms the second stop structure.

9. The switching valve according to claim 4, characterized in that: The connecting pipe (20) further comprises a third connecting pipe (23), and the sleeve (30) further comprises a third sleeve (33). 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 (33) is sleeved on the outside of the third connecting pipe (23). The projection of the third sleeve (33) on the first sleeve (31) is not higher than the top of the first section (311) of the first sleeve (31), and the projection of the third sleeve (33) on the first sleeve (31) is not lower than the bottom of the first section (311) of the first sleeve (31).

10. The switching valve according to claim 4, characterized in that: The connecting pipe (20) further comprises a fourth connecting pipe (24), and the sleeve (30) further comprises a fourth sleeve (34), the fourth connecting pipe (24) being arranged side by side with the first connecting pipe (21) and the second connecting pipe (22), the second connecting pipe (22) being located between the first connecting pipe (21) and the fourth connecting pipe (24), the fourth sleeve (34) comprising a fifth section (341) and a sixth section (342) connected in sequence, the fifth section (341) being connected to the inner side of the fourth connecting pipe (24), the sixth section (342) being arranged away from the fourth connecting pipe (24), the sixth section (342) being used to be connected to the external pipe (40), the inner diameter of the fifth section (341) being smaller than the inner diameter of the sixth section (342); The fourth connecting pipe (24) includes a seventh section (241) and an eighth section (242) connected in sequence, the seventh section (241) is connected to the valve body (10), the eighth section (242) is sleeved on the outer side of the fifth section (341), the inner diameter of the eighth section (242) is larger than the inner diameter of the seventh section (241), a third stop structure is provided between the seventh section (241) and the eighth section (242), and a fourth stop structure is provided between the fifth section (341) and the sixth section (342).

11. The switching valve according to claim 10, characterized in that: The second sleeve (32) comprises a ninth section (321) and a tenth section (322) connected in sequence, the ninth section (321) being sleeved on the outside of the second connecting tube (22), the tenth section (322) being arranged away from the second connecting tube (22), the tenth section (322) being used for connecting to the external tube (40), and the inner diameter of the ninth section (321) being smaller than the inner diameter of the tenth section (322).

12. The switching valve according to claim 11, characterized in that: The projections of the fourth sleeve (34) and the first sleeve (31) on the second sleeve (32) are no higher than the top of the ninth section (321).

13. The switching valve according to claim 10, characterized in that: The projections of the fourth connecting pipe (24) and the first connecting pipe (21) on the second sleeve (32) are not lower than the bottom of the second sleeve (32).

14. The switching valve according to claim 2, characterized in that: The switching valve further comprises: The connecting pipe (20) and the corresponding sleeve (30) together form a circulation channel, the circulation channel is connected to the valve cavity, the switching valve has a plurality of circulation channels, and the minimum circulation areas of the plurality of circulation channels are all equal.

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