Reversing valve

Abstract

The reversing valve comprises a main valve and a pilot valve, the main valve comprises a main valve body, the main valve body is provided with a mounting cavity, the pilot valve is partially inserted into the mounting cavity, the pilot valve is provided with a pilot valve inner cavity, the part, located in the mounting cavity, of the pilot valve is provided with a first high-pressure inlet, a first low-pressure inlet and two first switching flow guide openings, and the first high-pressure inlet communicates with the pilot valve inner cavity; the main valve body is provided with at least two capillary channels, and the capillary channels are communicated with the first switching flow guide opening and the main valve cavity; the pilot valve comprises a valve element and a stepping motor, the valve element is located in an inner cavity of the pilot valve, the valve element is provided with at least one flow guide channel, and the stepping motor can control the valve element to rotate at two positions; when the valve element is located at one position, one flow guide channel communicates with the first low-pressure inlet and one first switching flow guide opening, and the other flow guide channel communicates with the first high-pressure inlet and the other first switching flow guide opening. The capillary channel is machined in the main valve body, so that the reliability is high; the stepping motor can feed back the position of the pilot valve in real time to adapt to complex working conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a reversing valve. Background Art

[0002] A reversing valve in the prior art includes a main valve and a pilot valve, which are welded into a whole through multiple separate capillaries. Due to the large number of capillaries, the reversing valve is complicated, and the connection reliability requirements between the capillaries and the main valve and pilot valve are high, the processing is more difficult, and the capillaries are easily bumped, resulting in failure of the pilot valve reversal; moreover, the reversing valve in the prior art mostly uses an electromagnetic coil to control the pilot valve, and the electromagnetic coil is difficult to provide the vehicle with specific position feedback of the reversing valve. If the position of the pilot valve is stuck, the valve itself cannot identify its own state. Summary of the Invention

[0003] The purpose of the present invention is to provide a reversing valve with higher reliability and easy assembly, and the position of the pilot valve can be self-identified to provide the vehicle with specific position feedback of the valve.

[0004] In order to solve the above technical problems, the present invention provides a reversing valve, including a main valve and a pilot valve, wherein the main valve includes a main valve body, and the main valve body has an installation cavity.

[0005] A portion of the pilot valve is inserted into the installation cavity, and the pilot valve has a pilot valve inner cavity.

[0006] The part of the pilot valve located in the installation cavity has a high-pressure inlet, a low-pressure inlet and two switching guide ports.

[0007] The portion of the pilot valve located in the installation cavity has a first high-pressure inlet, a first low-pressure inlet and two first switching guide ports.

[0008] The first high-pressure inlet is connected to the inner cavity of the pilot valve, and the main valve body has at least two capillary channels, and the capillary channels are connected to the first switching guide port and the main valve cavity of the main valve;

[0009] The pilot valve includes a valve core and a stepping motor. The valve core is located in the inner cavity of the pilot valve and has at least one diversion channel. The stepping motor can control the valve core to rotate between two different positions.

[0010] When the valve core is in one of the positions, one of the guide channels is connected to the first low-pressure inlet and one of the first switching guide ports, and the other guide channel is connected to the first high-pressure inlet and the other first switching guide port.

[0011] The reversing valve of the present invention adopts the method of machining a capillary channel in the main valve body to connect the switching guide port and the main valve cavity, thereby improving the reliability of the connection between the capillary channel and the main valve and the pilot valve, and avoiding the problem of failure of the pilot valve reversal caused by capillary collision; a part of the pilot valve is inserted in the installation cavity, which facilitates the assembly of the pilot valve to the main valve; at the same time, the pilot valve is driven and controlled by a stepping motor, and the valve core is switched by rotation. The position of the pilot valve can identify its own state and provide the vehicle with specific position feedback of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a structural schematic diagram of a specific embodiment of the reversing valve provided by the present invention;

[0013] Figure 2 for Figure 1 The first split diagram of the reversing valve;

[0014] Figure 3 for Figure 2 Split diagram of the pilot valve in the reversing valve;

[0015] Figure 4 for Figure 1 Internal cross-sectional view of the reversing valve;

[0016] Figure 5 for Figure 1 Schematic diagram of the structure of the valve core in the reversing valve;

[0017] Figure 6 for Figure 1 Second split diagram of the reversing valve;

[0018] Figure 7 for Figure 6 Schematic diagram of the structure of the reversing valve at the second angle;

[0019] Figure 8 for Figure 1 Split diagram of the main valve in the reversing valve;

[0020] Figure 9 for Figure 4 Split diagram of the reversing valve;

[0021] Figure 10 for Figure 4 Structural diagram of the second angle;

[0022] Figure 11 for Figure 4 Structural diagram from the third angle;

[0023] Figure 12 for Figure 1 Schematic diagram of the structure of the pilot valve in the reversing valve;

[0024] Figure 13 for Figure 5 Schematic diagram of the structure of the second angle of the valve core;

[0025] Figure 14 for Figure 5 Longitudinal cross-sectional view of the valve core;

[0026] Figure 15 for Figure 5 A longitudinal cross-sectional view of the valve core at a second angle;

[0027] Figure 16 for Figure 5 Transverse cross-sectional view of the valve core;

[0028] Figure 17 It is a simplified diagram of the communication state when the reversing valve is in the first position;

[0029] Figure 18 A schematic diagram of the communication state when the reversing valve is in the second position;

[0030] in, Figures 1-18 The reference numerals in the figures are described as follows:

[0031] 1-Main valve; 11-Main valve body; 111-First valve body; 112-Second valve body; 113-Sealing cover; a-Groove; 11a-Capillary channel; 1A-Main valve chamber; b-Accommodation groove; 1a-End valve chamber; 11A-Joint surface; 12-Mounting chamber; 121-Mounting step; 12a-Location groove; 13-External interface; 14-Main valve seat; 15-Connecting rod; 16-Sliding bowl; 17-Piston; 18-Wear-resistant sleeve;

[0032] 2-pilot valve; 2a-pilot valve cavity; 21-valve core; c1-first guide groove; c2-second guide groove; d-through hole; 21a-guide channel; 22-stepping motor; 221-rotating shaft; 23-valve seat; 231-flange; 24-sealing ring;

[0033] 3-pressure ring;

[0034] 4-sealing pad; 4a-through hole; 41-positioning protrusion;

[0035] A1-first high-pressure inlet; B1-first low-pressure inlet; C1-first switching guide port;

[0036] A2-second high-pressure inlet; B2-second low-pressure inlet; C2-second switching guide port. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] The term “plurality” herein generally refers to more than two; and when “plurality” is used to indicate the number of certain components, it does not indicate the relationship between the quantities of these components.

[0039] Please refer to Figures 1-6 , Figure 1 This is a structural schematic diagram of a specific embodiment of the reversing valve provided by the present invention; Figure 2 for Figure 1 The first split diagram of the reversing valve; Figure 3 for Figure 2 Split diagram of the pilot valve in the reversing valve; Figure 4 for Figure 1 Internal cross-sectional view of the reversing valve; Figure 5 for Figure 1 Schematic diagram of the structure of the valve core in the reversing valve; Figure 6 for Figure 1 Second split diagram of the reversing valve.

[0040] The present invention provides a reversing valve, comprising a main valve 1 and a pilot valve 2. The main valve 1 comprises a main valve body 11, and the main valve body 11 has an installation cavity 12.

[0041] A portion of the pilot valve 2 is inserted into the installation cavity 12. The pilot valve 2 has a pilot valve inner cavity 2a.

[0042] The portion of the pilot valve 2 located in the installation chamber 12 has a first high-pressure inlet A1, a first low-pressure inlet B1 and two first switching guide ports C1.

[0043] The first high-pressure inlet A1 is connected to the pilot valve inner cavity 2a. The main valve body 11 has at least two capillary channels 11a. The capillary channels 11a are connected to the first switching guide port C1 and the main valve cavity 1A of the main valve 1.

[0044] The pilot valve 2 further includes a valve core 21 and a stepper motor 22. The valve core 21 is located inside the pilot valve cavity 2a. The valve core 21 has at least one guide channel 21a. The stepper motor 22 can control the valve core 21 to rotate between two different positions.

[0045] When the valve core 21 is in one position, one guide channel 21a is connected to the first low-pressure inlet B1 and a first switching guide port C1, and the other guide channel 21a is connected to the first high-pressure inlet A1 and the other first switching guide port C1.

[0046] The reversing valve of the present invention connects the first switching guide port C and the main valve cavity 1A of the main valve 1 by processing a capillary channel 11a on the main valve body 11, thereby improving the reliability of the connection between the capillary channel 11a and the main valve 1 and the pilot valve 2, and avoiding the problem of the pilot valve 2 reversing failure caused by capillary collision; a part of the pilot valve 2 is inserted into the installation cavity 12, which facilitates the assembly of the pilot valve 2 on the main valve 1; at the same time, the pilot valve 2 is driven and controlled by a stepping motor 22, and the valve core 21 is switched by rotation. The position of the pilot valve 2 can identify its own state and provide the vehicle with specific position feedback of the valve, ensuring that the reversing valve can adapt to various complex working conditions of the automobile.

[0047] like Figure 4 As shown, the stepper motor 22 has a rotating shaft 221 , which is connected to the valve core 21 . The rotating shaft 221 can drive the valve core 21 to rotate, thereby realizing position switching of the valve core 21 .

[0048] The connection method between the rotating shaft 221 and the valve core 21 is not limited. For example, a threaded connection hole can be provided on the side wall of the valve core 21 facing the rotating shaft 221, and an external thread can be provided on the end of the rotating shaft 221 near the valve core 21, and the rotating shaft 221 and the valve core 21 can be screwed together and fixed. Alternatively, a connection hole can be provided on the side wall of the valve core 21 facing the rotating shaft 221, and the end of the rotating shaft 221 near the valve core 21 can be inserted into the connection hole and have an interference fit to achieve fixation.

[0049] Please refer to Figure 4-Figure 8 , Figure 7 for Figure 6 Schematic diagram of the structure of the reversing valve at the second angle; Figure 8 for Figure 1 Schematic diagram of the main valve in the reversing valve.

[0050] In order to facilitate the processing of the capillary channel 11a and the chamber inside the main valve body 11, in this embodiment, the main valve body 11 includes a first valve body portion 111 and a second valve body portion 112, and the first valve body portion 111 and the second valve body portion 112 both include a joint surface 11A, and the joint surface 11A of the first valve body portion 111 is arranged opposite to and joined to the joint surface 11A of the second valve body portion 112, and at least one of the first valve body portion 111 and the second valve body portion 112 has a groove a recessed in the joint surface 11A, and the groove a forms the capillary channel 11a.

[0051] It is understood that if the capillary channel 11a is directly drilled into the main valve body 11, the required drilling length is relatively long and difficult to process. Therefore, the present invention divides the main valve body 11 into a first valve body portion 111 and a second valve body portion 112 arranged along the circumference. A groove a can be provided on the joint surface 11A of the two components to form the capillary channel 11a. The two components can also be simultaneously machined with a receiving groove b to form the main valve chamber 1A.

[0052] In actual applications, the groove a used to form the capillary channel 11a can be set only on the joint surface 11A of one of the first valve body portion 111 and the second valve body portion 112; or the groove a can be set on the joint surface 11A of the first valve body portion 111 and the second valve body portion 112 at the same time. In this case, the grooves a of the two joint surfaces 11A need to be set opposite to each other, and the two grooves a are spliced ​​together to form the aforementioned capillary channel 11a.

[0053] As mentioned above, a portion of the pilot valve 2 is inserted into the interior of the mounting cavity 12, and the pilot valve 2 and the mounting cavity 12 can be fixed by welding. Of course, this fixing method is not easy to replace the pilot valve 2.

[0054] Based on this, please refer to Figure 3-Figure 4 , Figures 9-11 , Figure 9 for Figure 4 Split diagram of the reversing valve; Figure 10 for Figure 4 Structural diagram of the second angle; Figure 11 for Figure 4 Structural diagram from the third angle.

[0055] In this embodiment, the pilot valve 2 includes a valve seat 23, the outer periphery of the valve seat 23 has a flange portion 231, the inner wall of the mounting cavity 12 has a mounting step 121, the inner wall of the mounting cavity 12 has a threaded connection portion, the pilot valve 2 includes a pressure ring 3 with an external thread, the valve seat 23 is installed inside the mounting cavity 12, the pressure ring 3 is sleeved on the outer periphery of the valve seat 23, at least part of the flange portion 231 is located between the pressure ring 3 and the mounting step 121, the external thread of the pressure ring 3 and the threaded connection portion are threadedly connected to press the flange portion 231 onto the mounting step 121.

[0056] In this way, the pilot valve 2 is an insert-type structure, and is pressed down by a pressure ring 3 with external threads to fix it to the installation step 121 inside the installation cavity 12. Compared with the welding fixation method, it is easier to install and replace the pilot valve 2.

[0057] It is understood that, in practice, in addition to securing the valve seat 23 via the pressure ring 3, external threads may be provided on the peripheral wall of the flange portion 231 of the valve seat 23, and internal threads may be provided on the inner wall of the mounting cavity 12, so that the valve seat 23 is screwed into the mounting cavity 12 to achieve relative fixation between the valve seat 23 and the mounting cavity 12. Of course, the method of securing the valve seat 23 via the pressure ring 3 in this embodiment reduces the difficulty of processing and is a more preferred technical solution.

[0058] Depend on Figure 9 It can be seen that in this embodiment, the outer peripheral wall of the valve seat 23 is also provided with an annular receiving groove, and also includes a sealing ring 24. The sealing ring 24 is mounted inside the annular receiving groove and abuts against the inner peripheral wall of the installation cavity 12 to achieve a reliable circumferential seal between the valve seat 23 and the installation cavity 12.

[0059] Of course, in actual applications, the annular accommodating groove can be provided not only on the outer peripheral wall of the valve seat 23 , but also on the inner peripheral wall of the installation cavity 12 .

[0060] The material of the sealing ring 24 includes but is not limited to rubber.

[0061] Please continue to refer to Figure 2-Figure 4 , Figures 9-18 , Figure 12 for Figure 1 Schematic diagram of the structure of the pilot valve in the reversing valve; Figure 13 for Figure 5 Schematic diagram of the structure of the second angle of the valve core; Figure 14 for Figure 5 Longitudinal cross-sectional view of the valve core; Figure 15 for Figure 5 A longitudinal cross-sectional view of the valve core at a second angle; Figure 16 for Figure 5 Transverse cross-sectional view of the valve core; Figure 17 It is a simplified diagram of the communication state when the reversing valve is in the first position; Figure 18 This is a simplified diagram of the communication state when the reversing valve is in the second position.

[0062] like Figure 3 As shown, in this embodiment, the first high-pressure inlet A1, the first low-pressure inlet B1 and the two first switching guide ports C1 are arranged on the end wall of the pilot valve 2, specifically on the end wall of the valve seat 23, and the line connecting the center points of the first high-pressure inlet A1, the first low-pressure inlet B1 and the two first switching guide ports C1 is a square, and the high-pressure inlet A and the low-pressure inlet B are located at the diagonals of the square line.

[0063] like Figure 2 As shown, the inner end wall of the installation cavity 12 is provided with a second high-pressure inlet A2, a second low-pressure inlet B2 and two second switching guide ports C2. The second high-pressure inlet A2 and the first high-pressure inlet A1 are connected, the first low-pressure inlet B1 and the second low-pressure inlet B2 are connected, and the first switching guide port C1 and the second switching guide port C are correspondingly connected.

[0064] like Figure 11 and Figure 13 As shown, the wall forming the pilot valve cavity 2a includes an inner end wall, and the valve core 21 is sealed and attached to the inner end wall. A portion of the valve core 21 faces the inner end wall and has a first guide groove c1 and a second guide groove c2. The first high-pressure inlet A1 and one of the first switching guide ports C1 can communicate with the first guide groove c1. The valve core 21 is provided with an axially extending through hole d at both ends of the first guide groove c1. The first high-pressure inlet A1 is connected to the pilot valve cavity 2a through the through hole d, and the first low-pressure inlet B1 and the other first switching guide port C can communicate with the second guide groove c2.

[0065] The guide channel 21 a includes a first guide groove c1 and a through hole d, and the guide channel 21 a includes a second guide groove c2.

[0066] It can be seen that in Figure 17 In the first position shown, the first high-pressure inlet A is connected to the first switching guide port C at the left end, and the first low-pressure inlet B is connected to the first switching guide port C at the right end. The left end valve cavity inside the main valve 1 is a low-pressure area, and the right end valve cavity inside the main valve 1 is a high-pressure area. Figure 18 In the second position shown, the first high-pressure inlet A is connected to the first switching guide port C at the right end, and the first low-pressure inlet B is connected to the first switching guide port C at the left end. The right-end valve cavity inside the main valve 1 is a low-pressure area, and the left-end valve cavity inside the main valve 1 is a high-pressure area. The reversing of the main valve 1 can be achieved through the pressure difference force of the valve cavities at both ends.

[0067] It is defined that the second high-pressure inlet A2 and the first high-pressure inlet A1 are connected to form a high-pressure inlet, the first low-pressure inlet B1 and the second low-pressure inlet B2 are connected to form a low-pressure inlet, and the first switching guide port C1 and the second switching guide port C are correspondingly connected to form a switching guide port.

[0068] like Figures 9-12 As shown, the reversing valve of the present invention further includes a sealing gasket 4, which is installed between the inner end wall of the pilot valve 2 and the end wall of the installation cavity 12. The sealing gasket 4 has four through holes 4a, which are connected to the high-pressure inlet, the low-pressure inlet and the two switching guide ports in a one-to-one correspondence.

[0069] In this way, a reliable seal between the inner end wall of the pilot valve 2 and the end wall of the installation cavity 12 can be achieved through the sealing gasket 4 to prevent gas leakage.

[0070] The material of the sealing gasket 4 includes but is not limited to rubber.

[0071] like Figure 2 and Figure 12 As shown, in this embodiment, the end wall of the sealing gasket 4 facing the installation cavity 12 has two positioning protrusions 41, and the inner side of the end wall of the installation cavity 12 has two positioning grooves 12a. The positioning grooves 12a and the positioning protrusions 41 can be plugged in and matched, thereby achieving relative fixation of the sealing gasket 4 and the installation cavity 12.

[0072] Of course, in practice, it is also feasible to provide the sealing gasket 4 with a positioning groove 12a and to provide a corresponding positioning protrusion 41 on the inner side of the end wall of the mounting cavity 12. At the same time, there is no limit on the number of positioning protrusions 41 and positioning grooves 12a. The number of positioning protrusions 41 and positioning grooves 12a can correspond one to one, and there can be at least one.

[0073] Alternatively, the sealing gasket 4 can also be fixed relative to the inner end wall of the pilot valve 2. Specifically, the sealing gasket 4 is provided with two protrusions on the inner end wall facing the pilot valve 2, and two grooves are correspondingly provided on the outer side of the end wall of the pilot valve 2. The grooves and protrusions are plug-fitted together to achieve relative fixation of the sealing gasket 4 and the pilot valve 2. Similarly, in practice, it is also feasible to provide the sealing gasket 4 with grooves and the outer side of the inner end wall of the pilot valve 2 with corresponding protrusions.

[0074] In addition, in practice, it is also feasible to fix the sealing gasket 4 to the inner end wall of the pilot valve 2 and the end wall of the installation cavity 12 by bonding.

[0075] like Figure 6-Figure 8 As shown, in this embodiment, the main valve body 11 is integrally processed with an external interface portion 13 to facilitate connection with an external pipe in the vehicle.

[0076] like Figure 4 , Figure 6-Figure 8 As shown, in this embodiment, a main valve seat 14 is further provided inside the main valve body 11. A sliding bowl 16 and a pair of pistons 17 connected by a connecting rod 15 are also provided inside the main valve body 11. The piston 17 divides the main valve chamber 1A inside the main valve body 11 into a middle valve chamber and two end valve chambers 1a. The end valve chambers 1a are located at both ends of the middle valve chamber 1b. The main valve seat 14 and the sliding bowl 16 form a sliding fit, and the piston 17 and the main valve body 11 form a sliding fit.

[0077] The main valve seat 14 and the sliding bowl 16 are slidably matched through the wear-resistant layer, and the piston 17 and the main valve body 11 are slidably matched through the wear-resistant layer.

[0078] In this way, the wear resistance of the mating surface between the main valve seat 14 and the sliding bowl 16 can be enhanced, ensuring that the main valve seat 14 and the sliding bowl 16 fit reliably; the wear resistance of the mating surface between the piston 17 and the main valve body 11 can be enhanced, ensuring that the piston 17 and the main valve body 11 fit reliably, thereby ensuring that the reversing valve works reliably.

[0079] At least one of the main valve seat 14 and the sliding bowl 16 has a wear-resistant layer. The wear-resistant layer may be a wear-resistant coating sprayed on at least one of the main valve seat 14 and the sliding bowl 16 .

[0080] Wherein, at least one of the piston 17 and the main valve body 11 has a wear-resistant layer, which can be a wear-resistant coating, and the wear-resistant coating is sprayed on at least one of the piston 17 and the main valve body 11; or Figure 6 As shown, the wear-resistant layer can also be a wear-resistant sleeve 18, which is fixed to at least one of the piston 17 and the main valve body 11. The wear-resistant sleeve 18 and the piston 17 can have an interference fit, and the wear-resistant sleeve 18 and the main valve body 11 can also have an interference fit.

[0081] Among them, Figure 8As can be seen, a portion of the main valve cavity 1A is located in the first valve body portion 111, while another portion is located in the second valve body portion 112. The plane on which the joint surface 11A lies passes through the main valve cavity 1A. The wall forming the main valve cavity 1A includes the main valve seat 14, which is integrally provided in only one of the first valve body portion 111 and the second valve body portion 112. Compared to a solution in which the main valve seat 14 and the main valve body 11 are manufactured separately and then spliced ​​together, the solution of the present application can form the main valve seat 14 and the main valve body 11 as a single piece, simplifying the manufacturing of the switching valve. Specifically, the joint surface 11A is flat or substantially flat, and extends in the direction of movement of the piston 17.

[0082] like Figure 6 As shown, in this embodiment, the main valve body 11 actually further includes covers 113 at both ends. After the first valve body portion 111 and the second valve body portion 112 are assembled, the two ends are sealed by the covers 113. The covers 113 and the first valve body portion 111 and the second valve body portion 112 can be fixed by welding.

[0083] In addition, in this embodiment, the main valve body 11 is made of aluminum alloy.

[0084] Since the refrigerant pipeline in the automobile is usually made of aluminum alloy, the main valve body 11 also adopts aluminum alloy to avoid electrochemical corrosion. In addition, the material of aluminum alloy is lighter than stainless steel, copper, etc., cheaper, and softer, and is convenient to cutting.

[0085] The above describes in detail the reversing valve provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above examples is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A reversing valve, characterized in that: The invention comprises a main valve (1) and a pilot valve (2), wherein the main valve (1) comprises a main valve body (11), and the main valve body (11) has a mounting cavity (12). A portion of the pilot valve (2) is inserted into the installation cavity (12), and the pilot valve (2) has a pilot valve inner cavity (2a). The portion of the pilot valve (2) located in the installation cavity (12) comprises a first high-pressure inlet (A1), a first low-pressure inlet (B1) and two first switching guide ports (C1). The first high-pressure inlet (A1) is connected to the pilot valve inner cavity (2a), the main valve body (11) has at least two capillary channels (11a), and the capillary channels (11a) are connected to the first switching guide port (C1) and the main valve cavity (1A) of the main valve (1); The pilot valve (2) comprises a valve core (21) and a stepping motor (22), wherein the valve core (21) is located in the inner cavity (2a) of the pilot valve, the valve core (21) has at least one guide channel (21a), and the stepping motor (22) is capable of controlling the valve core (21) to rotate between two different positions; When the valve core (21) is in one of the positions, one of the guide channels (21a) is connected to the first low-pressure inlet (B1) and one of the first switching guide ports (C1), and the other guide channel (21a) is connected to the first high-pressure inlet (A1) and another of the first switching guide ports (C1).

2. The reversing valve according to claim 1, characterized in that: The main valve body (11) includes a first valve body portion (111) and a second valve body portion (112), the first valve body portion (111) and the second valve body portion (112) both include a joint surface (11A), the joint surface (11A) of the first valve body portion (111) and the joint surface (11A) of the second valve body portion (112) are arranged opposite to and joined to each other, and at least one of the first valve body portion (111) and the second valve body portion (112) has a groove (a) recessed in the joint surface (11A), and the groove (a) forms the capillary channel (11a).

3. The reversing valve according to claim 1, characterized in that: The pilot valve (2) includes a valve seat (23), the outer periphery of the valve seat (23) has a flange portion (231), the inner wall of the mounting cavity (12) has a mounting step (121), and the inner wall of the mounting cavity (12) has a threaded connection portion; the pilot valve (2) includes a pressure ring (3) with an external thread, the valve seat (23) is mounted inside the mounting cavity (12), the pressure ring (3) is sleeved on the outer periphery of the valve seat (23), at least part of the flange portion (231) is located between the pressure ring (3) and the mounting step (121), the external thread of the pressure ring (3) and the threaded connection portion are threadedly connected to press the flange portion (231) onto the mounting step (121).

4. The reversing valve according to claim 3, characterized in that: The pilot valve (2) comprises a sealing ring (24), and the sealing ring (24) is installed between the outer peripheral wall of the valve seat (23) and the inner peripheral wall of the installation cavity (12).

5. The reversing valve according to claim 1, characterized in that: The first high-pressure inlet (A1), the first low-pressure inlet (B1) and the two first switching guide ports (C1) are arranged on the end wall of the pilot valve (2); a line connecting the center points of the first high-pressure inlet (A1), the first low-pressure inlet (B1) and the two first switching guide ports (C1) forms a square, and the high-pressure inlet (A) and the low-pressure inlet (B) are located at opposite corners of the square line; The inner end wall of the installation cavity (12) is provided with a second high-pressure inlet (A2), a second low-pressure inlet (B2) and two second switching guide ports (C2); the second high-pressure inlet (A2) is connected to the first high-pressure inlet (A1), the first low-pressure inlet (B1) is connected to the second low-pressure inlet (B2), and the first switching guide port (C1) is connected to the second switching guide port (C1); The wall forming the pilot valve inner cavity (2a) includes an inner end wall, the valve core (21) is sealed and fitted to the inner end wall, a portion of the valve core (21) faces the inner end wall and has a first guide groove (c1) and a second guide groove (c2), the first high-pressure inlet (A1) and one of the first switching guide ports (C1) can be communicated with the first guide groove (c1), the valve core (21) is provided with axially penetrating through holes (d) at both ends of the first guide groove (c1), the first high-pressure inlet (A1) is communicated with the pilot valve inner cavity (2a) through the through hole (d), the first low-pressure inlet (B1) and the other first switching guide port (C) can be communicated with the second guide groove (c2), the guide channel (21a) includes the first guide groove (c1) and the through hole (d), and the guide channel (21a) includes the second guide groove (c2).

6. The reversing valve according to claim 5, characterized in that: The second high-pressure inlet (A2) and the first high-pressure inlet (A1) are connected to form a high-pressure inlet, the first low-pressure inlet (B1) and the second low-pressure inlet (B2) are connected to form a low-pressure inlet, and the first switching guide port (C1) and the second switching guide port (C) are correspondingly connected to form a switching guide port; The reversing valve further comprises a sealing gasket (4), which is installed between the inner end wall of the pilot valve (2) and the end wall of the installation cavity (12), and the sealing gasket (4) has four through holes (4a), and the through holes (4a) correspond to and are connected with the high-pressure inlet, the low-pressure inlet and the switching guide port one by one.

7. The reversing valve according to claim 6, characterized in that: The inner end wall of the installation cavity (12) or the end wall of the pilot valve (2) is provided with one of a positioning groove (12a) and a positioning protrusion (41), and the sealing gasket (4) is provided with the other of the positioning groove (12a) and the positioning protrusion (41), and the positioning groove (12a) and the positioning protrusion (41) can be plug-fitted.

8. The reversing valve according to any one of claims 1 to 7, characterized in that: The main valve body (11) is provided with a main valve seat (14), a sliding bowl (16) and a pair of pistons (17) connected by a connecting rod (15), the piston (17) divides the main valve cavity (1A) into a middle valve cavity and end valve cavities (1a) located at both ends of the middle valve cavity, at least one capillary channel (11a) connects the switching guide port (C) and the end valve cavity (1a), the main valve seat (14) and the sliding bowl (16) are in sliding cooperation, and the piston (17) and the main valve body (11) are in sliding cooperation; The main valve seat (14) and the sliding bowl (16) are slidably matched via a wear-resistant layer, and the piston (17) and the main valve body (11) are slidably matched via a wear-resistant layer.

9. The reversing valve according to claim 8, characterized in that: At least one of the main valve seat (14) and the sliding bowl (16) is sprayed with a wear-resistant coating, and the wear-resistant coating is the wear-resistant layer; At least one of the piston (17) and the main valve body (11) is sprayed with a wear-resistant coating, and the wear-resistant coating is the wear-resistant layer; or at least one of the piston (17) and the main valve body (11) includes a wear-resistant sleeve (18), and the wear-resistant sleeve (18) forms the wear-resistant layer.

10. The reversing valve according to claim 2, characterized in that: A portion of the main valve cavity (1A) is located in the first valve body portion (111), and another portion of the main valve cavity is located in the second valve body portion (112). The plane where the joint surface (11A) is located passes through the main valve cavity (1A), and the wall forming the main valve cavity (1A) includes a main valve seat (14). The main valve seat (14) is only integrally arranged on one of the first valve body portion (111) and the second valve body portion (112).

11. The reversing valve according to any one of claims 1 to 7, characterized in that: The main valve body (11) is integrally machined with an external interface portion (13); And / or, the main valve body (11) is made of aluminum alloy.

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