Baffle, piston and reversing valve

Abstract

According to the technical scheme, the baffle, the piston and the reversing valve are characterized in that the baffle comprises a plate body, rivet holes and runner grooves are formed in the plate body, the runner grooves are formed in the periphery of the plate body, and the baffle is used on the piston and installed in a main valve body of a switching valve; when the front face or the back face of the baffle is installed on the switching valve, the flow channel groove right faces the capillary tube hole in the end of the main valve body, and therefore the problem that the baffle is installed reversely does not exist, and the assembling difficulty is lowered.

Description

Technical Field

[0001] The invention relates to the field of reversing valves, and more particularly to a baffle, a piston and a reversing valve. Background Art

[0002] The reversing valve has a main valve body, a guide frame and a piston. The guide frame is located in the main valve body, and the piston is installed at the end of the guide frame. The piston is used to separate the cavity in the main valve body. Figure 1 , Figure 2 As shown, the piston is composed of an inner baffle (01), a toothed spring (02), a piston bowl (03), a first outer baffle (04), a second outer baffle (05), and a rivet (06). The second outer baffle has two rivet holes (07), two screw holes (08) and two flow channel grooves (09). When assembling the reversing valve, the second outer baffle is first assembled to the piston by rivets, and then two screws are passed through the screw holes (07) and connected to the guide frame to achieve the connection between the piston and the guide frame. The end of the main valve body has a capillary hole for connecting the capillary. When the piston is located at the end of the main valve body, the flow channel groove (09) is used to face the capillary hole, so that the refrigerant in the capillary connected to the end of the main valve can enter the end of the inner cavity of the main valve body through the flow channel groove (09).

[0003] However, when the second outer baffle is assembled on the piston, the assembler first needs to identify the rivet hole and the screw hole. Secondly, the flow channel groove (09) and the screw hole (08) have a positional relationship requirement, that is, the second outer baffle has a front and back side, and there is a risk of reverse installation. Therefore, the assembler needs to identify the front and back sides during assembly, which makes the assembly more complicated. Once the second outer baffle is reversed, the flow channel groove (09) cannot face the capillary hole at the end of the reversing valve, and the refrigerant in the capillary tube is difficult to enter the end of the inner cavity of the main valve body, which will make it difficult for the reversing valve to be reversed. Summary of the invention

[0004] In view of the deficiencies in the prior art, the object of the present invention is to provide a baffle, a piston and a reversing valve to prevent the baffle from being assembled upside down on the piston, thereby reducing the difficulty of assembly.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a baffle, comprising a plate body, on which rivet holes and flow grooves are arranged, and the flow grooves are arranged on the outer periphery of the plate body. The baffle is used on the piston and installed in the main valve body of the switching valve. When the front or back side of the baffle is installed on the switching valve, the flow groove is opposite to the capillary hole at the end of the main valve body.

[0006] As a further improvement of the present invention, two rivet holes and a plurality of flow channel grooves are arranged on the plate body, the plurality of flow channel grooves are arranged at intervals on the outer periphery of the plate body, and the plurality of flow channel grooves are symmetrically arranged along the line connecting the two rivet holes.

[0007] It can be understood that at this time, the plate body is a symmetrical structure, the plate body shape is more regular, and it is easy to process. The front and back sides of the baffle are the same, and the baffle has no front and back sides, which is easy to assemble.

[0008] As a further improvement of the present invention, when the front or back side of the baffle is mounted on the switching valve, at least one of the flow channel grooves faces the capillary hole at the end of the main valve body.

[0009] It can be understood that no matter whether the baffle is installed on the switching valve on the front or back, it only needs to ensure that at least one flow channel groove is directly opposite to the capillary hole to ensure that the refrigerant in the capillary tube can enter the end of the inner cavity of the main valve body through the flow channel groove, thereby achieving the effect of the reversing valve being not affected whether the baffle is installed on the front or back.

[0010] As a further improvement of the present invention, two rivet holes are arranged on the plate body, and the plate body is symmetrically arranged around the center of the midpoint of the line connecting the two rivet holes.

[0011] It is understandable that the shape of the plate body is more regular at this time, which is convenient for processing. The plate rotates 180 degrees without affecting assembly, further reducing the difficulty of assembly.

[0012] As a further improvement of the present invention, the number of the flow channel grooves is two, and the two flow channel grooves are respectively located on both sides of a line connecting the two rivet holes.

[0013] It can be understood that the smaller number of flow channel grooves facilitates processing.

[0014] As a further improvement of the present invention, the groove wall of the flow channel groove includes a concave surface, and the concave surface is bent toward the direction of the connecting line of the two rivet holes.

[0015] It is understandable that the baffle of the present application is not provided with a screw hole, and through the setting of the concave surface, the head of the screw will not conflict with the baffle, but with the first outer baffle on the piston, and the length of the screw will be shorter, which is conducive to reducing costs. The avoidance space formed by the concave surface is for the head of the screw and the workpiece of the rotating screw to enter, so that the installer can tighten the screw with a tool. The setting of the concave surface increases the space of the flow channel groove, which is conducive to increasing the speed at which the refrigerant in the capillary enters the main valve body, thereby increasing the reversing speed of the reversing valve.

[0016] As a further improvement of the present invention, the groove wall of the flow channel groove also includes a connecting surface, which is a plane and is provided with two connecting surfaces, and the two connecting surfaces are respectively located between the outer side surface of the plate body and the two sides of the concave surface.

[0017] It can be understood that, by setting the connecting surface, the shortest distance between the rivet hole and the flow channel groove is increased, thereby being able to improve the strength of the plate body.

[0018] As a further improvement of the present invention, the groove wall of the flow channel groove is a plane.

[0019] It can be understood that, at this time, the flow channel groove is formed by tool stamping, and when the groove wall of the flow channel groove is a plane, the tool can be designed to be simpler and the production cost is lower.

[0020] As a further improvement of the present invention, an angle A formed between two end points formed on the outer periphery of the plate body at the flow channel groove and a midpoint of a line connecting the two rivet holes is greater than or equal to 90 degrees.

[0021] It is understandable that when the angle A is greater than or equal to 90 degrees, the flow channel groove is large enough to ensure that the flow channel groove faces the capillary hole. At this time, the larger the flow channel groove is, the faster the refrigerant in the capillary enters the main valve body, and the faster the reversing speed of the reversing valve is.

[0022] To achieve the above-mentioned purpose, the present invention also provides the following technical solution: a piston, comprising an inner baffle plate, a toothed spring, a piston bowl, a first outer baffle plate, a second outer baffle plate and a rivet, wherein the inner baffle plate, the toothed spring, the piston bowl, the first outer baffle plate and the second outer baffle plate are connected in sequence by the rivet, and the second outer baffle plate is the above-mentioned baffle plate.

[0023] To achieve the above-mentioned purpose, the present invention also provides the following technical solution: a reversing valve, comprising a main valve body, a guide frame and the above-mentioned piston, the guide frame is located in the main valve body, the piston is installed at the end of the guide frame, the end of the main valve body is provided with a capillary hole, when the front or back side of the baffle is installed on the switching valve, at least one of the flow channel grooves is opposite to the capillary hole.

[0024] As a further improvement of the present invention, the reversing valve also includes an end cover, which is fixed to the end of the main valve body, and the sum of the thicknesses of the first outer baffle plate and the baffle plate is greater than or equal to the distance L between the side of the end cover facing the capillary hole and the edge of the capillary hole away from the end cover.

[0025] It is understandable that even when the piston slides to the position that contacts the end cover, the piston wrist will not be aligned with the capillary hole, thereby avoiding the situation where the pressure of the capillary hole is lower than the pressure on the side of the piston away from the end cover, and the piston wrist is deformed under the pressure difference at the capillary hole, resulting in a reduced life of the piston wrist.

[0026] Beneficial effects of the present invention:

[0027] Only rivet holes and flow channel grooves are provided on the plate body, but no screw holes are provided. Compared with the existing baffles provided with screw holes, the baffle of the present application does not need to be processed with screw holes, and the overall processing is more convenient. When assembling the baffle to the piston, the assembler does not need to identify the rivet holes and screw holes, and the assembly is simpler. In addition, since the flow channel groove and the capillary hole can be directly opposite regardless of whether the baffle is installed on the front or back side, that is, the refrigerant in the capillary tube can inevitably enter the end of the inner cavity of the main valve body through the flow channel groove, the front or back installation of the baffle does not affect the reversing of the reversing valve. When installing the baffle, the assembler does not need to identify the front and back sides of the baffle, and the assembly is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a three-dimensional structural schematic diagram of a piston in the prior art;

[0029] Figure 2 A cross-sectional view of a piston of the prior art;

[0030] Figure 3 is a schematic diagram of the structure of the baffle;

[0031] Figure 4 is a structural schematic diagram of another embodiment of a baffle;

[0032] Figure 5 is a structural schematic diagram of another embodiment of a baffle;

[0033] Figure 6 is a structural schematic diagram of another embodiment of a baffle;

[0034] Figure 7 Schematic diagram of the three-dimensional structure of the piston;

[0035] Figure 8 is a cross-sectional view of the piston;

[0036] Fig. 9 is a cross-sectional view of the reversing valve;

[0037] Fig.10 It is a structural schematic diagram of the reversing valve;

[0038] Fig.11 for Fig.10 Enlarged view of point A in the middle.

[0039] Figure numerals: 1, plate body; 2, rivet hole; 3, flow channel groove; 31, concave surface; 32, connecting surface; 33, inclined surface; 41, inner baffle plate; 42, toothed spring; 43, piston bowl; 44, first outer baffle plate; 45, rivet; 51, main valve body; 52, guide frame; 53, capillary hole; 54, end cover. DETAILED DESCRIPTION

[0040] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, if the terms "first", "second", "third" appear, they are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] Reference Figures 3 to 6 As shown, a baffle of this embodiment includes a plate body 1, on which a rivet hole 2 and a flow channel groove 3 are arranged, and the flow channel groove 3 is arranged on the outer periphery of the plate body 1. The plate body 1 can be formed by punching out the rivet hole 2 and the flow channel groove 3 from a circular plate through a tool. No screw holes are additionally arranged on the plate body 1. Compared with the existing baffles with screw holes, the baffle of the present application does not need to be processed with screw holes, and the overall processing is more convenient. When assembling the baffle to the piston, the assembler does not need to identify the rivet hole 2 and the screw hole, and the assembly is simpler.

[0044] The baffle is used on the piston and installed in the main valve body 51 of the switching valve. When the front or back side of the baffle is installed on the switching valve, the flow channel groove 3 faces the capillary hole 53 at the end of the main valve body 51. The flow channel groove 3 faces the capillary hole 53, which means that when the baffle is installed on the piston, the piston is installed in the main valve body 51 and slides to one end of the main valve body 51, the flow channel groove 3 on the baffle can avoid the outlet of the capillary hole 53, so that the refrigerant in the capillary can enter one end of the inner cavity of the main valve body 51 through the capillary hole 53 and the flow channel groove 3.

[0045] Since the flow channel groove 3 and the capillary hole 53 can be directly opposite each other regardless of whether the baffle is installed on the front or back side, that is, the refrigerant in the capillary tube can definitely enter the end of the inner cavity of the main valve body 51 through the flow channel groove 3, the reversing of the reversing valve will not be affected whether the baffle is installed on the front or back side. When installing the baffle, the assembler does not need to identify the front and back sides of the baffle, which makes the assembly easier.

[0046] In one embodiment, referring to Figures 3 to 6 As shown, two rivet holes and a plurality of flow channel grooves are arranged on the plate body, and the plurality of flow channel grooves are arranged at intervals on the outer periphery of the plate body, and the plurality of flow channel grooves 3 are symmetrically arranged along the connecting line of the two rivet holes 2. When the front or back side of the baffle is installed on the switching valve, at least one flow channel groove faces the capillary hole at the end of the main valve body. At this time, the plate body 1 is set to a symmetrical structure, and the shape of the plate body 1 is more regular, which is convenient for processing. Since the flow channel groove 3 runs through the front and back sides of the baffle, when the baffle is symmetrical, the front and back sides of the baffle are the same, and the baffle has no distinction between the front and back sides, which is convenient for assembly.

[0047] In one embodiment, referring to Figures 3 to 6 As shown, the plate body 1 can also be set as a central symmetrical structure, and the plate body 1 is centrally symmetrically arranged around the midpoint of the line connecting the two rivet holes 2. In this case, the flow channel groove 3 arranged on the plate body 1 is also centrally symmetrical. The shape of the plate body 1 is more regular, which is convenient for processing. Moreover, the assembly is not affected after the plate is rotated 180 degrees, which further reduces the difficulty of assembly.

[0048] In one embodiment, referring to Figures 3 to 6 As shown, the number of the flow channel grooves 3 is set to two, and the two flow channel grooves 3 are respectively located on both sides of the line connecting the two rivet holes 2. When the plate body 1 is both a symmetrical structure and a central symmetrical structure, the midpoint of the line connecting the two rivet holes 2 is the center of the plate body 1 and also the midpoint of the line connecting the two flow channel grooves 3. At this time, the shape of the plate body 1 is the most regular.

[0049] The flow channel 3 can be set in various forms. Specifically, one of the forms of the flow channel 6 is shown in FIG. Figure 6 As shown, in this embodiment, the groove wall of the flow channel groove 3 is a plane. The groove wall of the flow channel groove 3 is a plane, which means that the main body of the groove wall is a plane, but a round chamfer can be set at the connection between the groove wall and the outer wall surface of the plate body 1 to prevent stress concentration at the connection, which causes the plate body 1 to be easily damaged. The groove wall of the flow channel groove 3 is perpendicular to the two end surfaces of the baffle, and the groove walls of the two flow channel grooves 3 are parallel. At this time, the groove wall structure of the flow channel groove 3 is the simplest, the tool for stamping the flow channel groove 3 can be designed to be simpler, and the production cost is lower.

[0050] Other forms of flow channel 3 refer to Figures 3 to 5As shown, in this embodiment, the groove wall of the flow channel groove 3 includes a concave surface 31, and the concave surface 31 is bent toward the direction of the connection line of the two rivet holes 2. The avoidance space formed by the concave surface 31 is for the head of the screw to enter. The baffle of the present application is not provided with a screw hole, but through the setting of the concave surface 31, the head of the screw will not conflict with the baffle of the present application, but will conflict with the first outer baffle 44 on the piston after entering the avoidance space formed by the concave surface 31, and the length of the screw will be shorter, which is conducive to reducing costs. The avoidance space formed by the concave surface 31 is also for the workpiece of the rotating screw to enter, so that the installer can tighten the screw with a tool. The setting of the concave surface 31 also increases the space of the flow channel groove 3, which is conducive to increasing the speed at which the refrigerant in the capillary enters the main valve body 51, thereby increasing the reversing speed of the reversing valve.

[0051] Specifically, refer to Figure 3 As shown, the bottom of the flow channel groove 3 is formed by a concave surface 31, and both sides of the concave surface 31 are connected to the outer wall surface of the plate body 1, and a round chamfer is provided at the connection to prevent stress concentration at the connection, which may cause the plate body 1 to be easily damaged. At this time, the groove wall structure of the flow channel groove 3 is only the concave surface 31, and the structure is simple, so the tool for stamping the flow channel groove 3 can also be designed to be relatively simple, which is conducive to reducing production costs.

[0052] Reference Figure 4 As shown, the groove wall of the flow channel groove 3 includes a concave surface 31 and a connecting surface 32. The connecting surface 32 is a plane and is provided with two. The two connecting surfaces 32 are located on both sides of the concave surface 31. One side of the connecting surface 32 is connected to the concave surface 31, and the other side is connected to the outer side surface of the plate body 1. Round chamfers are provided between the connecting surface 32 and the concave surface 31, and between the connecting surface 32 and the outer side surface of the plate body 1 to prevent stress concentration at the connection, which causes the plate body 1 to be easily damaged. The two connecting surfaces 32 are located on the same plane, and the connecting surfaces 32 on the two flow channel grooves 3 are parallel to each other. By setting the connecting surface 32, the shortest distance between the rivet hole 2 and the flow channel groove 3 is increased, and the area of ​​the two ends of the plate body 1 where the rivet hole 2 is provided is increased. Thereby, the strength of the plate body 1 can be improved.

[0053] Reference Figure 5As shown, the groove wall of the flow channel groove 3 includes a concave surface 31, a connecting surface 32 and an inclined surface 33. The connecting surface 32 and the inclined surface 33 are both planes and are provided with two. The two inclined surfaces 33 are respectively located on both sides of the concave surface 31 and connected to the concave surface 31. One side of the connecting surface 32 is connected to the inclined surface 33, and the other side is connected to the outer side surface of the plate body 1. Round chamfers are provided between the connecting surface 32 and the inclined surface 33, and between the connecting surface 32 and the outer side surface of the plate body 1 to prevent stress concentration at the connection, which may cause the plate body 1 to be easily damaged. The two connecting surfaces 32 are located on the same plane, and the connecting surfaces 32 on the two flow channel grooves 3 are parallel to each other. An angle is formed between the two inclined surfaces 33. There is a smooth transition between the inclined surface 33 and the concave surface 31.

[0054] In one embodiment, referring to Figure 3 As shown, the angle A formed between the two end points formed at the flow channel groove 3 on the outer periphery of the plate body 1 and the midpoint of the line connecting the two rivet holes 2 is greater than or equal to 90 degrees. It can be understood that when the angle A is greater than or equal to 90 degrees, the flow channel groove 3 is large enough to ensure that the flow channel groove 3 is directly opposite to the capillary hole 53. At this time, the larger the flow channel groove 3 is, the faster the speed at which the refrigerant in the capillary enters the main valve body 51 is, and the faster the reversing speed of the reversing valve is.

[0055] Reference Figure 7 , Figure 8 As shown, a piston of this embodiment includes an inner baffle plate 41, a toothed spring 42, a piston bowl 43, a first outer baffle plate 44, a second outer baffle plate and a rivet 45, wherein the inner baffle plate 41, the toothed spring 42, the piston bowl 43, the first outer baffle plate 44 and the second outer baffle plate are sequentially connected by the rivet 45. The inner baffle plate 41 and the first outer baffle plate 44 are sandwiched between the toothed spring 42 and the piston arm, and the toothed spring 42 is used to provide an outwardly opening force to the piston arm so that the piston arm can keep in contact with the inner surface of the main valve seat.

[0056] The second outer baffle is the baffle of the above-mentioned embodiment. Only rivet holes 2 and flow channel grooves 3 are set on the plate body 1 of the baffle, and no screw holes are set. The baffle does not need to be additionally processed with screw holes, and the overall processing is more convenient. When assembling the piston, the assembler does not need to identify the rivet holes 2 and screw holes on the baffle, and the assembly is simpler. When assembling the piston, whether the baffle is installed on the front or back, after the piston is installed in the main valve body 51, it can be ensured that at least one flow channel groove 3 is opposite to the capillary hole 53, that is, the refrigerant in the capillary can inevitably enter the end of the inner cavity of the main valve body 51 through the flow channel groove 3. Therefore, whether the baffle is installed on the front or back, it will not affect the reversing of the reversing valve. When assembling the piston, the assembler does not need to identify the front and back of the baffle, and the assembly of the piston is simpler.

[0057] Reference Figures 9 to 11As shown, a reversing valve of this embodiment comprises a main valve body 51, an end cover 54, a guide frame 52 and a piston of the above embodiment, wherein the end cover 54 is fixed to the end of the main valve body 51, the guide frame 52 is located in the main valve body 51, the piston is mounted on the end of the guide frame 52 by screws, a slider is mounted on the guide frame 52, and the guide frame 52 drives the slider to move to realize the reversal of the reversing valve. The end cover 54 is used to contact with the baffle on the piston, thereby limiting the sliding of the guide frame 52, and the end cover 54 protrudes in a direction away from the piston toward the center of one side of the piston. When the baffle contacts the end cover 54, a receiving cavity is formed between the protrusion on the end cover 54 and the baffle, and the flow channel groove 3 on the baffle is used to conduct the capillary hole 53 and the receiving cavity.

[0058] The process of installing the baffle to the switching valve is as follows: the baffle is first installed on the piston, then the piston is installed on the guide frame 52, and finally the guide frame 52 is installed on the main valve body 51. A capillary hole 53 is provided at the end of the main valve body 51. When the baffle is installed on the piston on the front or back side and finally installed on the main valve body 51 of the switching valve, at least one of the flow channel grooves 3 is opposite to the capillary hole 53. That is, when the piston collides with the end cover 54, at least one of the flow channel grooves 3 connects the capillary hole 53 and the accommodating chamber, so that the refrigerant in the capillary tube can inevitably enter the accommodating chamber through the flow channel groove 3. Therefore, whether the baffle is installed on the front or back side does not affect the reversing of the reversing valve. When assembling the piston, the assembler does not need to identify the front and back sides of the baffle, and the assembly of the piston is simpler. Only rivet holes 2 and flow channel grooves 3 are provided on the plate body 1 of the baffle, and no screw holes are provided. The baffle does not need additional processing of screw holes, and the overall processing is more convenient. When assembling the piston, the assembler does not need to identify the rivet holes 2 and screw holes on the baffle, and the assembly is simpler.

[0059] In one embodiment, referring to Fig.11As shown, the sum of the thickness of the first outer baffle plate 44 and the baffle plate is greater than or equal to the distance L between the side of the end cover 54 facing the capillary hole 53 and the edge of the capillary hole 53 away from the end cover 54. The capillary hole 53 is usually formed by the main valve body 51 turning upside down, that is, there is a transition section between the end of the capillary hole 53 facing the inside of the main valve body 51 and the inner wall of the main valve body 51, and the inner diameter of the transition section gradually increases from the capillary hole 53 to the main valve body 51, and the edge of the capillary hole 53 away from the end cover 54 refers to the edge position of the transition section where the inner diameter is the largest and away from the end cover 54, and the distance L between this position and the side of the end cover 54 facing the capillary hole 53 is less than the sum of the thickness of the first outer baffle plate 44 and the baffle plate. Even when the piston slides to a position that contacts the end cover 54, the piston wrist will not be aligned with the capillary hole 53, thereby preventing the pressure of the capillary hole 53 from being lower than the pressure on the side of the piston away from the end cover 54, and the piston wrist being deformed by the pressure difference at the point where it is aligned with the capillary hole 53, resulting in a reduction in the life of the piston wrist.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A baffle, Features: The invention comprises a plate body (1), on which a rivet hole (2) and a flow channel groove (3) are arranged, and the flow channel groove (3) is arranged on the outer periphery of the plate body (1); the baffle is used on the piston and is installed in the main valve body (51) of the switching valve; when the front or back side of the baffle is installed on the switching valve, the flow channel groove (3) faces the capillary hole (53) at the end of the main valve body (51).

2. A baffle according to claim 1, Features: Two rivet holes (2) and a plurality of flow channel grooves (3) are arranged on the plate body (1); the plurality of flow channel grooves (3) are arranged at intervals on the outer periphery of the plate body (1); and the plurality of flow channel grooves (3) are symmetrically arranged along a line connecting the two rivet holes (2).

3. A baffle according to claim 1, Features: When the front or back side of the baffle is mounted on the switching valve, at least one of the flow channel grooves (3) faces the capillary hole (53) at the end of the main valve body (51).

4. A baffle according to claim 1, Features: Two rivet holes (2) are arranged on the plate body (1), and the plate body (1) is symmetrically arranged around the center of the midpoint of the line connecting the two rivet holes (2).

5. A baffle according to claim 4, Features: The flow channel grooves (3) are provided in two numbers, and the two flow channel grooves (3) are respectively located on both sides of the line connecting the two rivet holes (2).

6. A baffle according to claim 5, Features: The groove wall of the flow channel groove (3) comprises a concave surface (31), and the concave surface (31) is bent in the direction of the connecting line of the two rivet holes (2).

7. A baffle according to claim 6, Features: The groove wall of the flow channel groove (3) further comprises a connecting surface (32), the connecting surface (32) is a plane and two connecting surfaces (32) are provided, and the two connecting surfaces (32) are respectively located between the outer side surface of the plate body (1) and the two sides of the concave surface (31).

8. A baffle according to claim 5, Features: The groove wall of the flow channel groove (3) is a plane.

9. A baffle according to claim 5, Features: The angle A formed between two end points formed on the outer periphery of the plate body (1) at the flow channel groove (3) and the midpoint of the line connecting the two rivet holes (2) is greater than or equal to 90 degrees.

10. A piston, Features: The invention comprises an inner baffle plate (41), a toothed spring (42), a piston bowl (43), a first outer baffle plate (44), a second outer baffle plate and a rivet (45); the inner baffle plate (41), the toothed spring (42), the piston bowl (43), the first outer baffle plate (44) and the second outer baffle plate are connected in sequence through the rivet (45); the second outer baffle plate is the baffle plate according to any one of claims 1 to 9.

11. A reversing valve, Features: It comprises a main valve body (51), a guide frame (52) and the piston as claimed in claim 10, wherein the guide frame (52) is installed in the main valve body (51), the piston is installed at the end of the guide frame (52), and a capillary hole (53) is provided at the end of the main valve body (51), and when the front or back side of the baffle is installed on the switching valve, at least one of the flow channel grooves (3) is opposite to the capillary hole (53).

12. A reversing valve according to claim 11, Features: The reversing valve further comprises an end cover (54), wherein the end cover (54) is fixed to the end of the main valve body (51), and the sum of the thicknesses of the first outer baffle plate (44) and the baffle plate is greater than or equal to a distance L between a side of the end cover (54) facing the capillary hole (53) and an edge of the capillary hole (53) away from the end cover (54).

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