Main valve, switching valve, main valve machining method and switching valve machining method

Abstract

The invention provides a main valve, a switching valve, a main valve machining method and a switching valve machining method.The main valve comprises a valve pipe, the side wall of the valve pipe is provided with a plurality of assembling holes used for installing connecting pipes, the side wall of the valve pipe is further provided with an installing hole, and the installing hole is used for installing a guide valve; and the mounting hole and one assembly hole are coaxially arranged. According to the scheme, the mounting hole and the assembly hole are coaxially arranged, machining of the two holes is facilitated, the mounting hole can be punched and formed through a punch penetrating through the corresponding assembly hole, in this way, after the assembly hole is machined, the mounting hole can be machined continuously without clamping the main valve again, the clamping frequency is reduced, and the machining efficiency is improved; and the mounting hole is formed by punching outwards from the inside of the valve pipe, so that the formed hole is a hole with an outer flange, and after the valve pipe is connected with the pilot valve, compared with an existing hole without a flange, the connecting area is longer, and the connecting strength is improved. According to the scheme, the machining efficiency of the main valve and the connecting strength of the main valve and the pilot valve are improved.

Description

Technical Field

[0001] This invention relates to the field of switching valve technology, and more specifically, to a main valve, a switching valve, a main valve processing method, and a switching valve processing method. Background Technology

[0002] Switching valves, such as four-way valves, are used to change the direction of fluid flow. A typical switching valve includes a main valve, a pilot valve, connecting pipes, and capillary tubes. In existing switching valves, the pilot valve and main valve are usually connected by a specially designed bracket; the bracket is mounted on the main valve, and the pilot valve is mounted on the bracket, with the pilot valve and main valve separated. This approach involves many parts and is relatively expensive. With technological advancements, some designs have eliminated the bracket, directly connecting the pilot valve and main valve, thus reducing the number of parts and lowering costs.

[0003] However, the main valve of the aforementioned switching valve requires the machining of multiple holes to connect the pilot valve and multiple connecting pipes respectively. The holes for installing the pilot valve and the holes for installing the connecting pipes are independent and need to be machined from different positions on the outside of the main valve. This results in a large number of clamping operations, and the position of the holes cannot form an outward flange. The connection position with the pilot valve is relatively thin, which affects the machining efficiency of the main valve and the connection strength with the pilot valve. Summary of the Invention

[0004] This invention provides a main valve, a switching valve, a main valve processing method, and a switching valve processing method, to at least solve the problem of low processing efficiency of the main valve in the prior art.

[0005] To address the aforementioned problems, according to one aspect of the present invention, a main valve is provided for switching valves. The main valve includes a valve tube, the side wall of which has a plurality of assembly holes for mounting connecting pipes, and the side wall of the valve tube also has a mounting hole for mounting a pilot valve; wherein the mounting hole and an assembly hole are coaxially arranged.

[0006] Furthermore, the side wall of the valve pipe is also provided with a D-hole for installing the connecting pipe, and the D-hole and an assembly hole are coaxially arranged.

[0007] Furthermore, the diameter of the mounting hole is less than or equal to the diameter of its corresponding assembly hole; and / or, the diameter of the D hole is less than or equal to the diameter of its corresponding assembly hole.

[0008] Furthermore, the periphery of the mounting hole has a flange facing outwards from the valve tube; and / or, the periphery of the D hole has a flange facing outwards from the valve tube.

[0009] Furthermore, the multiple mounting holes include holes E, S, and C arranged sequentially along the length of the valve tube, wherein one of the mounting holes and hole D is coaxially arranged with hole C, and the other is coaxially arranged with hole E.

[0010] According to another aspect of the present invention, a switching valve is provided, the switching valve including a pilot valve and the aforementioned main valve, one end of the pilot valve being connected to the mounting hole of the main valve.

[0011] Furthermore, the switching valve also includes multiple connecting pipes and multiple capillaries. Each mounting hole is connected to a connecting pipe, one end of each capillary is connected to a pilot valve, the other end of at least one capillary is connected to a valve pipe, and the other end of at least one capillary is connected to a connecting pipe.

[0012] Furthermore, the holes for connecting the capillary tube on the pilot valve, the valve tube, and the connecting pipe all face the same direction.

[0013] Furthermore, all capillaries are integral structures, each capillary is directly connected to the pilot valve, the valve tube is directly connected to the corresponding capillary, and the connecting tube is directly connected to the corresponding capillary.

[0014] Furthermore, the valve tube, pilot valve, capillary tube, and connecting pipe are all made of stainless steel, and the connection between any two of them is welded.

[0015] Furthermore, the hole on the valve tube that connects to the capillary tube is the first hole, and the first hole has a flange facing outward from the valve tube; the hole on the connecting pipe that connects to the capillary tube is the second hole, and the second hole has a flange facing inward from the connecting pipe.

[0016] Furthermore, the switching valve also includes a sleeve, one end of which is inserted into the sleeve and welded to the inner wall of the sleeve, and the sleeve is inserted into the mounting hole and welded to the inner wall of the mounting hole.

[0017] According to another aspect of the present invention, a main valve machining method is provided, the main valve machining method being used for the aforementioned main valve, the main valve machining method comprising:

[0018] Multiple assembly holes are machined on the valve pipe of the main valve. These assembly holes are used to install connecting pipes.

[0019] Insert the machining tool into an assembly hole and machine a mounting hole on the side wall of the valve tube. The mounting hole is used to install the pilot valve.

[0020] Furthermore, the main valve processing method also includes:

[0021] Insert the machining tool into another mounting hole and machine a D-hole on the side wall of the valve tube. The D-hole is used to install the connecting pipe.

[0022] Furthermore, the machining tool is a punch, and the main valve machining method also includes:

[0023] Before stamping the mounting hole, a first pre-hole is machined on the side wall of the valve tube at a position corresponding to an assembly hole. The diameter of the first pre-hole is smaller than that of the mounting hole. When machining the mounting hole, the first pre-hole is pressed by a punch to form the mounting hole.

[0024] Before punching the D hole, a second pre-hole is machined on the side wall of the valve tube at the position corresponding to another assembly hole. The diameter of the second pre-hole is smaller than that of the D hole. When machining the D hole, the second pre-hole is pressed by a punch to form the D hole.

[0025] Furthermore, the machining tool is a punch, and the main valve machining method also includes:

[0026] The valve tube is placed into the bottom mold, which has a first forming hole and a second forming hole. The punch is inserted into the first forming hole, and under the action of the punch and the first forming hole, an mounting hole with an outward flange is formed. The punch is inserted into the second forming hole, and under the action of the punch and the second forming hole, an mounting hole with an outward flange is formed.

[0027] According to another aspect of the present invention, a method for processing a switching valve is provided. The method is used for the aforementioned switching valve and includes:

[0028] A sleeve is installed between the mounting hole of the main valve and one end of the pilot valve. The outer wall of the pilot valve is welded to the inner wall of the sleeve, and the outer wall of the sleeve is welded to the inner wall of the mounting hole.

[0029] According to another aspect of the present invention, a method for processing a switching valve is provided. The method is used for the aforementioned switching valve and includes:

[0030] The main valve, pilot valve, connecting pipe, and capillary tube of the switching valve are made of stainless steel. The main valve, pilot valve, connecting pipe, and capillary tube are then assembled and furnace-welded together.

[0031] The present invention provides a main valve for switching valves. The main valve includes a valve tube with multiple assembly holes on its side wall for mounting connecting pipes. The side wall of the valve tube also has mounting holes for mounting a pilot valve. The mounting hole and an assembly hole are coaxially arranged. In this design, the coaxial arrangement of the mounting hole and assembly hole facilitates the machining of both holes. The mounting hole can be formed by stamping with a punch inserted through the corresponding assembly hole. This allows for machining of the mounting hole without re-clamping the main valve after machining the assembly hole, reducing the number of clamping operations and improving machining efficiency. Furthermore, the mounting hole is formed by stamping from the inside of the valve tube outwards, resulting in a hole with an outward flange. After connection with the pilot valve, the connection area is longer compared to holes without flanges in the prior art, thus improving the connection strength. Therefore, this design improves the machining efficiency of the main valve and the connection strength between the main valve and the pilot valve. Attached Figure Description

[0032] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0033] Figure 1 A perspective view of the main valve provided in an embodiment of the present invention is shown;

[0034] Figure 2 It shows Figure 1 A front view of the main valve in the middle;

[0035] Figure 3 It shows Figure 1 A schematic diagram of the punching of the main valve in the diagram;

[0036] Figure 4 A perspective view of a switching valve provided in an embodiment of the present invention is shown;

[0037] Figure 5 A cross-sectional view of a switching valve provided in an embodiment of the present invention is shown;

[0038] Figure 6 It shows Figure 5 A magnified view of a portion of the image;

[0039] Figure 7 A schematic diagram showing the connection between the main valve and the pilot valve in a switching valve provided by another embodiment of the present invention is shown.

[0040] The above figures include the following reference numerals:

[0041] 10. Valve pipe;

[0042] 11. Assembly holes;

[0043] 12. Mounting holes;

[0044] 13. Hole D;

[0045] 14. First hole;

[0046] 20. Pilot valve;

[0047] 30. Takeover;

[0048] 31. Second hole;

[0049] 40. Capillary tube;

[0050] 50. Sleeve;

[0051] 60. Punch;

[0052] 70. Bottom mold. Detailed Implementation

[0053] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0054] like Figures 1 to 7 As shown, an embodiment of the present invention provides a main valve for switching valves. The main valve includes a valve tube 10. The side wall of the valve tube 10 has a plurality of assembly holes 11 for mounting a connecting pipe 30. The side wall of the valve tube 10 also has a mounting hole 12 for mounting a pilot valve 20. The mounting hole 12 and an assembly hole 11 are coaxially arranged.

[0055] In this design, the mounting hole 12 and the assembly hole 11 are coaxially arranged, facilitating the machining of both holes. The mounting hole 12 can be formed by a punch 60 inserted through the corresponding assembly hole 11. This allows for machining of the mounting hole without re-clamping the main valve after machining the assembly hole 11, reducing the number of clamping operations and improving machining efficiency. Furthermore, the mounting hole 12 is formed by punching from the inside of the valve tube 10 outwards, resulting in a hole with an outward flange. After connection with the pilot valve 20, the connection area is longer compared to holes without flanges in existing technologies, thus improving connection strength. Therefore, this design improves the machining efficiency of the main valve and the connection strength between the main valve and the pilot valve 20.

[0056] The diameter of the mounting hole 12 is less than or equal to the diameter of its corresponding assembly hole 11. This ensures that the diameter of the punch 60 or other tool used to process the mounting hole 12 is less than the diameter of the assembly hole 11, thus allowing the punch 60 or other tool to be inserted into the assembly hole 11.

[0057] After being stamped by punch 60, the periphery of mounting hole 12 has a flange facing outward from valve tube 10, which improves the connection strength with pilot valve 20.

[0058] Furthermore, the side wall of the valve pipe 10 is also provided with a D-hole 13 for installing the connecting pipe 30. The D-hole 13 and an assembly hole 11 are coaxially arranged, which facilitates the machining of the D-hole 13 and the corresponding assembly hole 11.

[0059] With the above setup, after machining the assembly hole 11, the main valve can be re-clamped before machining the D hole 13, reducing the number of clamping operations and improving machining efficiency. Specifically, the D hole 13 can be formed by punching it through the corresponding assembly hole 11, that is, the D hole 13 is formed by punching it from the inside of the valve tube 10 outward. The hole formed in this way has an outward flange, which improves the connection strength after being connected to a connecting pipe 30.

[0060] Specifically, the diameter of hole D13 is less than or equal to the diameter of its corresponding mounting hole 11, so that the diameter of the punch 60 or other tool used to process hole D13 is less than the diameter of mounting hole 11, ensuring that the punch 60 or other tool can be inserted into mounting hole 11.

[0061] The periphery of the D-hole 13 has a flange facing outwards from the valve tube 10, which enhances the connection strength with the connecting pipe.

[0062] like Figure 1 , Figure 2 and Figure 5 As shown, the plurality of mounting holes 11 include holes E, S, and C arranged sequentially along the length of the valve tube 10. One of the mounting holes and hole D is coaxially aligned with hole C, and the other is coaxially aligned with hole E. This arrangement allows for a gap of one mounting hole 11 between mounting holes 12 and D holes 13, preventing them from being too close and affecting the molding quality, and also preventing the installation of the connecting pipe 30 and the pilot valve 20 from being too close.

[0063] like Figures 4 to 6 As shown, the present invention also provides a switching valve, which includes a pilot valve 20 and the aforementioned main valve. One end of the pilot valve 20 is connected to the mounting hole 12 of the main valve. In this design, the mounting hole 12 and an assembly hole 11 are coaxially arranged. The mounting hole 12 is formed by a punch 60 inserted through the corresponding assembly hole 11. This allows for machining of the mounting hole after the assembly hole 11 is machined without re-clamping the main valve, reducing the number of clamping operations and improving machining efficiency. Furthermore, the mounting hole 12 is formed by punching from the inside of the valve tube 10 outwards, resulting in a hole with an outward flange. After connection with the pilot valve 20, the connection area is longer compared to holes without flanges in the prior art, thus improving the connection strength. Therefore, this design improves the machining efficiency of the switching valve and the connection strength between the main valve and the pilot valve 20.

[0064] like Figure 4As shown, the switching valve also includes multiple connecting pipes 30 and multiple capillary tubes 40. Each mounting hole 11 is connected to a connecting pipe 30. One end of each capillary tube 40 is connected to a pilot valve 20, and the other end of at least one capillary tube 40 is connected to a valve pipe 10. The other end of at least one capillary tube 40 is connected to a connecting pipe 30. The connecting pipes 30 are used to connect with other pipelines to achieve fluid flow. The fluid in the pilot valve 20 and the fluid in the main valve are associated through the capillary tubes 40, thereby switching the main valve and changing the direction of fluid flow through the action of the pilot valve 20. The switching valve can specifically be a four-way valve.

[0065] Specifically, the holes on the pilot valve 20, the valve tube 10, and the connecting pipe 30 all face the same direction. This arrangement of multiple capillary tubes 40 on the same side of the switching valve facilitates their arrangement and connection. Furthermore, the axial direction of the holes connecting to the capillary tubes 40 is perpendicular to the axial direction of the valve tube 10 and the connecting pipe.

[0066] In this design, multiple capillary tubes 40 are integrated structures, each directly connected to the pilot valve 20, the valve tube 10 directly connected to the corresponding capillary tube 40, and the connecting tube 30 directly connected to the corresponding capillary tube 40. By directly connecting the capillary tubes 40 to other structures, there is no need to install short tubes at the ends of the capillary tubes 40 and then connect them to other structures through short tubes, thereby simplifying the number of parts and reducing costs.

[0067] Specifically, valve pipe 10, pilot valve 20, capillary tube 40, and connecting pipe 30 are all made of stainless steel, and any connection between them is welded. Using stainless steel reduces cost, and the connection points between two parts can be directly welded, resulting in high weld strength. Therefore, this design reduces production costs.

[0068] Here, pilot valve 20 refers to the outer shell structure, and other parts are installed inside pilot valve 20. Connector 30 refers to an integral pipe, and the end of the connector away from the main valve can be fitted with a joint of other materials, which connects to other pipelines.

[0069] like Figure 1 , Figure 5 and Figure 6 As shown, the hole on the valve tube 10 that connects to the capillary tube 40 is the first hole 14, and the first hole 14 has a flange facing outward from the valve tube 10. The hole on the connecting pipe 30 that connects to the capillary tube 40 is the second hole 31, and the second hole 31 has a flange facing inward from the connecting pipe 30.

[0070] The connection strength of the capillary tube 40 can be improved by setting a flange. Specifically, the first hole 14 has a flange facing outwards from the valve tube 10, which can avoid interference between the inward flange and the internal structure of the valve tube 10. The second hole 31 has a flange facing inwards from the connecting pipe 30, which is easier to process than the outward flange.

[0071] like Figure 7 As shown, in another embodiment, the switching valve further includes a sleeve 50. One end of the pilot valve 20 passes through the sleeve 50 and is welded to the inner wall of the sleeve 50. The sleeve 50 passes through the mounting hole 12 and is welded to the inner wall of the mounting hole 12. By providing the sleeve 50, the connection strength between the main valve and the pilot valve 20 can be improved. The length of the sleeve 50 is greater than the length of the mounting hole 12.

[0072] The present invention also provides a main valve processing method for the above-mentioned main valve. The main valve processing method includes: processing a plurality of assembly holes 11 on the valve tube 10 of the main valve, the assembly holes 11 being used to install the connecting pipe 30; inserting a processing tool into one assembly hole 11 and processing a mounting hole 12 on the side wall of the valve tube 10, the mounting hole 12 being used to install the pilot valve 20.

[0073] Using this method, the mounting hole 12 is formed by a punch 60 that passes through the corresponding assembly hole 11. This way, after the assembly hole 11 is processed, the mounting hole can be processed without re-clamping the main valve, reducing the number of clamping operations and improving processing efficiency. Furthermore, the mounting hole 12 is formed by punching from the inside of the valve tube 10 outwards, resulting in a hole with an outward flange. After being connected to the pilot valve 20, the connection area is longer compared to holes without flanges in the prior art, thus improving the connection strength.

[0074] The assembly hole 11 is formed by laser cutting.

[0075] Furthermore, the main valve machining method also includes: inserting a machining tool into another mounting hole 11 and machining a D-hole 13 on the side wall of the valve tube 10, the D-hole 13 being used to install the connecting pipe 30. In this way, the punch 60 can be inserted into the position of the mounting hole 11 and punched out the D-hole 13.

[0076] In this way, after machining the assembly hole 11, the main valve can be re-clamped before machining the D hole 13, reducing the number of clamping operations and improving machining efficiency. Furthermore, the D hole 13 is formed by punching from the inside of the valve tube 10 outwards, resulting in a hole with an outward flange, which improves the connection strength after being connected to a connecting pipe 30.

[0077] If the diameters of hole D13 and mounting hole 12 are the same, the same punch 60 can be used; if the diameters of hole D13 and mounting hole 12 are different, punches 60 of different sizes can be used respectively.

[0078] Furthermore, the processing tool is a punch 60, and the main valve processing method also includes: before punching the mounting hole 12, a first pre-hole is processed on the side wall of the valve tube 10 at a position corresponding to an assembly hole 11, the diameter of the first pre-hole being smaller than that of the mounting hole 12; when processing the mounting hole 12, the first pre-hole is pressed by the punch 60 to form the mounting hole 12; before punching the D hole 13, a second pre-hole is processed on the side wall of the valve tube 10 at a position corresponding to another assembly hole 11, the diameter of the second pre-hole being smaller than that of the D hole 13; when processing the D hole 13, the second pre-hole is pressed by the punch 60 to form the D hole 13.

[0079] The first and second pre-holes can be machined by laser cutting or punching. By setting the first and second pre-holes, the punch 60 can be positioned more accurately. Furthermore, compared with direct punching, cracking of the punched flange can be avoided.

[0080] Furthermore, such as Figure 3 As shown, the main valve processing method further includes: placing the valve tube 10 into the bottom mold 70, the bottom mold 70 having a first forming hole and a second forming hole; wherein, the punch 60 passes through the first forming hole, and under the action of the punch 60 and the first forming hole, a mounting hole 12 with an outward flange is formed; the punch 60 passes through the second forming hole, and under the action of the punch 60 and the second forming hole, a mounting hole 12 with an outward flange is formed. The bottom mold 70 can limit the main valve, guide the punch 60, and limit the flange to make the flange conform to the required shape.

[0081] This invention also provides a method for manufacturing a switching valve. The method, used for the aforementioned switching valve, includes: installing a sleeve 50 between the mounting hole 12 of the main valve and one end of the pilot valve 20; welding the outer wall of the pilot valve 20 to the inner wall of the sleeve 50; and welding the outer wall of the sleeve 50 to the inner wall of the mounting hole 12. By installing and welding the sleeve 50, a reliable connection between the pilot valve 20 and the main valve can be achieved.

[0082] This invention also provides another method for manufacturing a switching valve, which is used for the aforementioned switching valve. The method includes: fabricating a main valve, pilot valve 20, connecting pipe 30, and capillary tube 40 from stainless steel; assembling the main valve, pilot valve 20, connecting pipe 30, and capillary tube 40, and then furnace welding them together. Using stainless steel reduces cost, and the furnace welding of multiple parts together results in high efficiency and high strength. Therefore, this method can reduce production costs.

[0083] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0084] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, 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.

[0085] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as exemplary only and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0086] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0087] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0088] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

Claims

1. A main valve for switching valves, characterized in that, The main valve includes a valve tube (10), the side wall of which has a plurality of assembly holes (11) for mounting a connecting pipe (30), and the side wall of the valve tube (10) also has a mounting hole (12) for mounting a pilot valve (20); wherein the mounting hole (12) and the assembly hole (11) are coaxially arranged.

2. The main valve according to claim 1, characterized in that, The side wall of the valve pipe (10) is also provided with a D hole (13) for installing the connecting pipe (30), and the D hole (13) and the mounting hole (11) are coaxially arranged.

3. The main valve according to claim 2, characterized in that, The diameter of the mounting hole (12) is less than or equal to the diameter of its corresponding assembly hole (11); and / or, the diameter of the D hole (13) is less than or equal to the diameter of its corresponding assembly hole (11).

4. The main valve according to claim 2, characterized in that, The periphery of the mounting hole (12) has a flange facing outward from the valve tube (10); and / or, the periphery of the D hole (13) has a flange facing outward from the valve tube (10).

5. The main valve according to claim 3, characterized in that, The plurality of mounting holes (11) include holes E, S and C arranged sequentially along the length of the valve tube (10), wherein one of the mounting holes and the hole D is coaxially arranged with the hole C and the other is coaxially arranged with the hole E.

6. A switching valve, characterized in that, The switching valve includes a pilot valve (20) and a main valve according to any one of claims 1 to 5, wherein one end of the pilot valve (20) is connected to the mounting hole (12) of the main valve.

7. The switching valve according to claim 6, characterized in that, The switching valve also includes multiple connecting pipes (30) and multiple capillary tubes (40). Each of the mounting holes (11) is connected to one of the connecting pipes (30). One end of each capillary tube (40) is connected to the pilot valve (20). The other end of at least one capillary tube (40) is connected to the valve tube (10). The other end of at least one capillary tube (40) is connected to the connecting pipe (30).

8. The switching valve according to claim 7, characterized in that, The holes on the pilot valve (20) connected to the capillary tube (40), the holes on the valve tube (10) connected to the capillary tube (40), and the holes on the connecting pipe (30) connected to the capillary tube (40) all face the same direction.

9. The switching valve according to claim 7, characterized in that, The multiple capillary tubes (40) are all integral structures, each capillary tube (40) is directly connected to the pilot valve (20), the valve tube (10) is directly connected to the corresponding capillary tube (40), and the connecting tube (30) is directly connected to the corresponding capillary tube (40).

10. The switching valve according to claim 7, characterized in that, The valve tube (10), the pilot valve (20), the capillary tube (40), and the connecting pipe (30) are all made of stainless steel, and the connection between any two of them is welded.

11. The switching valve according to claim 7, characterized in that, The hole on the valve tube (10) that connects to the capillary tube (40) is a first hole (14), and the first hole (14) has a flange facing outward from the valve tube (10). The hole on the connecting pipe (30) that connects to the capillary tube (40) is a second hole (31), and the second hole (31) has a flange facing inward from the connecting pipe (30).

12. The switching valve according to claim 6, characterized in that, The switching valve also includes a sleeve (50), one end of the pilot valve (20) is inserted into the sleeve (50) and welded to the inner wall of the sleeve (50), and the sleeve (50) is inserted into the mounting hole (12) and welded to the inner wall of the mounting hole (12).

13. A method for processing a main valve, characterized in that, The main valve processing method is used for the main valve according to any one of claims 1 to 5, and the main valve processing method includes: Multiple assembly holes (11) are machined on the valve tube (10) of the main valve, and the assembly holes (11) are used to install the connecting pipe (30); The machining tool is inserted into one of the assembly holes (11) and a mounting hole (12) is machined on the side wall of the valve tube (10), the mounting hole (12) being used to install the pilot valve (20).

14. The main valve processing method according to claim 13, characterized in that, The main valve processing method also includes: The machining tool is inserted into another of the assembly holes (11) and a D-hole (13) is machined on the side wall of the valve tube (10), the D-hole (13) being used to install the connecting pipe (30).

15. The main valve processing method according to claim 14, characterized in that, The processing tool is a punch (60), and the main valve processing method further includes: Before stamping the mounting hole (12), a first pre-hole is machined on the side wall of the valve tube (10) at a position corresponding to one of the assembly holes (11). The diameter of the first pre-hole is smaller than that of the mounting hole (12). When machining the mounting hole (12), the first pre-hole is pressed by a punch (60) to form the mounting hole (12). Before stamping the D hole (13), a second pre-hole is machined at the position corresponding to another assembly hole (11) on the side wall of the valve tube (10). The diameter of the second pre-hole is smaller than that of the D hole (13). When machining the D hole (13), the second pre-hole is squeezed by a punch (60) to form the D hole (13).

16. The main valve processing method according to claim 14, characterized in that, The processing tool is a punch (60), and the main valve processing method further includes: The valve tube (10) is placed into the bottom mold (70), which has a first forming hole and a second forming hole; wherein, the punch (60) is inserted into the first forming hole, and under the action of the punch (60) and the first forming hole, the mounting hole (12) with an outward flange is formed; the punch (60) is inserted into the second forming hole, and under the action of the punch (60) and the second forming hole, the mounting hole (12) with an outward flange is formed.

17. A method for processing a switching valve, characterized in that, The switching valve processing method is used for the switching valve according to any one of claims 6 to 12, and the switching valve processing method includes: A sleeve (50) is provided between the mounting hole (12) of the main valve and one end of the pilot valve (20). The outer wall of the pilot valve (20) and the inner wall of the sleeve (50) are welded together, and the outer wall of the sleeve (50) and the inner wall of the mounting hole (12) are welded together.

18. A method for processing a switching valve, characterized in that, The switching valve processing method is used for the switching valve according to any one of claims 6 to 12, and the switching valve processing method includes: The main valve, pilot valve (20), connecting pipe (30), and capillary tube (40) of the switching valve are made of stainless steel. The main valve, the pilot valve (20), the connecting pipe (30), and the capillary tube (40) are installed and furnace welded together.

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