End cover and directional control valve

Abstract

Provided in the present application are an end cover and a directional control valve. The end cover is configured to be mounted at a mounting port of a valve body of the directional control valve, the end cover has a sealing surface, the sealing surface is formed with a shaft hole and directional control holes, the directional control holes run through the end cover in the direction of thickness, at least two directional control holes are provided, the distance between the center of the shaft hole and the centers of two of the directional control holes is the same, the two directional control holes each have an excircle trajectory, the center of the excircle trajectory coincides with the center of the shaft hole, the excircle trajectory has tangent points with the two directional control holes, the excircle trajectory is divided into a first trajectory and a second trajectory by two tangent points, the first trajectory is located within the sealing surface, and at least part of the second trajectory is located beyond the sealing surface. By means of the solution, the problem of potential cross-port leakage of a directional control valve in the prior art can be solved.

Description

End cover and reversing valve

[0001] The present application claims priority to the patent application No. 202421982781.4 filed on August 15, 2024 with the China National Intellectual Property Office and titled "End cover and reversing valve". TECHNICAL FIELD

[0002] The present application relates to the technical field of valves, in particular to an end cover and a reversing valve. BACKGROUND

[0003] The reversing valve plays an important role in the refrigeration system, which has the function of controlling the flow direction of the refrigerant.

[0004] The existing reversing valve includes a valve body, a valve core and an end cover. The valve body has a valve cavity, a first flow-through hole, a second flow-through hole and a mounting port. The first flow-through hole, the second flow-through hole and the mounting port are respectively communicated with the valve cavity. The end cover is arranged at the mounting port. The end cover is provided with two independent reversing holes. The two reversing holes are respectively communicated with the valve cavity. The valve core is a hollow structure. The valve core is rotatably arranged in the valve cavity. One end of the valve core is communicated with the first flow-through hole. The other end of the valve core is selectively communicated with one of the two reversing holes to realize reversing.

[0005] In the prior art, in order to facilitate the machining and assembly of the end cover, the end cover is usually machined into a central symmetrical structure, and the center of symmetry is on the rotation axis of the valve core. However, after the end cover with the above shape is assembled to the mounting port of the valve body, the stress area is large, and deformation is easy to occur, which may cause the fluid in the valve core and the fluid in the valve cavity to flow together, affecting the sealing and reversing effect of the reversing valve. SUMMARY

[0006] The present application provides an end cover and a reversing valve to solve the problem of possible flow together of the reversing valve in the prior art.

[0007] According to an aspect of the present application, an end cover is provided. The end cover is used for being mounted at a mounting port of a valve body of a reversing valve. The end cover has a sealing surface. The sealing surface is provided with an axle hole and reversing holes. The reversing holes are arranged through the end cover along a thickness direction. There are at least two reversing holes. The distance between the center of the axle hole and the center of each of the two reversing holes is the same. The two reversing holes have an excircle locus. The center of the excircle locus coincides with the center of the axle hole. The excircle locus has two tangent points with the two reversing holes. The excircle locus is divided into a first locus line and a second locus line by the two tangent points. The first locus line is located in the sealing surface. At least part of the second locus line is located outside the sealing surface.

[0008] Further, the arc of the first locus line is a, and a≤π.

[0009] Further, the profile of the sealing surface comprises circular arc segments and straight line segments connected to each other, the first track line is arranged close to the circular arc segments, and the second track line has two intersection points with the straight line segments; or, the second track line has two intersection points with the circular arc segments.

[0010] Further, the circular arc segments comprise main circular arc segments and transition circular arc segments connected to each other, the radius of the main circular arc segments is greater than that of the transition circular arc segments, the center of the main circular arc segments is located in the sealing surface, and two transition circular arc segments are arranged at two ends of the main circular arc segments respectively, and the two ends of the transition circular arc segments are connected to the straight line segments and the main circular arc segments respectively.

[0011] Further, the end cover comprises a body part and a connecting part connected to each other, the connecting part is arranged annularly at the outer periphery of the sealing surface, and the inner surface of the body part forms the sealing surface, and the connecting part is used for connecting to the valve body.

[0012] Further, the sealing surface protrudes from one side of the connecting part used for connecting to the valve body.

[0013] According to another aspect of the present application, a reversing valve is provided, which comprises: a valve body having a valve cavity and a first mounting port in communication with each other, the first mounting port being arranged at an end of the valve cavity, the valve body further being provided with a first flow-through hole and a second flow-through hole, the first flow-through hole and the second flow-through hole being in communication with the valve cavity respectively; a first end cover, which is the above-mentioned end cover, the first end cover being sealed at the first mounting port, the profile of the sealing surface of the first end cover being adapted to the profile of the first mounting port, the two reversing holes of the first end cover being in communication with the valve cavity respectively, and the shaft hole of the first end cover being coaxial with the first flow-through hole; a valve core comprising a first opening, a flow-through channel and a second opening in sequence, the first opening being rotatably arranged at and in communication with the first flow-through hole, the second opening being selectively in communication with the two reversing holes, and the second opening of the valve core moving along the first track line; and a guide shaft coaxial with the first opening, one end of the guide shaft being arranged on the valve core, and the other end being rotatably arranged in the shaft hole.

[0014] Further, the reversing valve further comprises: a driving gear and a driven gear in mesh with each other, the driving gear and the driven gear being rotatably arranged in the valve cavity respectively, and the driven gear being sleeved on the outer periphery of the first opening of the valve core.

[0015] Further, the reversing valve further comprises: a limiting structure arranged between the driven gear and the valve body, the limiting structure being used for limiting the rotation angle of the valve core relative to the valve body.

[0016] Further, the valve body comprises: a main body part having the valve cavity, the first mounting port and the second flow-through hole, the main body part being provided with a second mounting port at an end away from the first mounting port, the second mounting port being in communication with the valve cavity; a second end cover arranged at the second mounting port, the first flow-through hole being arranged on the second end cover, and the limiting structure being arranged between the driven gear and the second end cover.

[0017] Further, the limiting structure comprises: a limiting recess provided on the inner end face of the second end cover, the limiting recess is provided in an arc shape, and the limiting recess is coaxially arranged with the first flow-through hole; and a limiting portion provided on the driven gear, the limiting portion is movably arranged in the limiting recess, and the limiting portion is limited in cooperation with two ends of the limiting recess in the extending direction.

[0018] By applying the technical solution of the present application, the first trajectory line is located in the sealing surface, and at least part of the second trajectory line is located outside the sealing surface. In this way, the rotation switching of the valve core can be ensured. In the prior art, the end cover is usually machined into a centrally symmetric structure, and the center of symmetry is on the rotation axis of the valve core. In this way, the first trajectory line and the second trajectory line are both located in the sealing surface. Compared with the end cover in the prior art, in the present application, since at least part of the second trajectory line is located outside the sealing surface, the area of the sealing surface of the end cover is smaller, and the end cover is subjected to smaller pressure from the fluid in the valve cavity. The above arrangement reduces the possibility of deformation of the end cover, thereby reducing the possibility of fluid flow between the fluid in the valve core and the fluid in the valve cavity, and reducing the possibility of fluid leakage at the connection between the end cover and the valve body, thereby improving the switching effect of the directional valve. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application. The use of the same reference numerals in different drawings indicates similar or identical components. In the drawings:

[0020] FIG. 1 shows a structural schematic diagram of an end cover provided by an embodiment of the present application;

[0021] FIG. 2 shows a structural schematic diagram of a directional valve provided by an embodiment of the present application from a first perspective;

[0022] FIG. 3 shows an exploded structural schematic diagram of a directional valve provided by an embodiment of the present application;

[0023] FIG. 4 shows a structural schematic diagram of a directional valve provided by an embodiment of the present application from a second perspective;

[0024] FIG. 5 shows a partial structural sectional view of a directional valve provided by an embodiment of the present application;

[0025] FIG. 6 shows a structural schematic diagram of a driven gear provided by an embodiment of the present application;

[0026] FIG. 7 shows a structural schematic diagram of a second end cover provided by an embodiment of the present application;

[0027] FIG. 8 shows a sectional view of a driven gear provided by an embodiment of the present application;

[0028] FIG. 9 shows a structural schematic diagram of a directional valve assembly connecting pipe provided by an embodiment of the present application.

[0029] Wherein, the above figures include the following reference signs: 10, valve body; 101, valve cavity; 102, first mounting port; 103, first flow-through hole; 104, second flow-through hole; 105, second mounting port; 11, main body part; 12, second end cover; 201, sealing surface; 2011, main circular arc segment; 2012, transition circular arc segment; 2013, straight line segment; 202, shaft hole; 203, reversing hole; 20, first end cover; 21, main body part; 22, connecting part; 30, valve core; 301, first opening; 302, flow-through channel; 303, second opening; 40, guide shaft; 51, driving gear; 52, driven gear; 61, limiting recess; 62, limiting part; 70, first connecting pipe flange; 80, second connecting pipe flange; 91, first connecting pipe; 92, second connecting pipe; 93, third connecting pipe. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. The description of the at least one exemplary embodiment is actually only illustrative, but not as any limitation on the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As shown in FIGS. 1-3, the present application provides an end cover, which is used for being installed at a mounting port of a valve body 10 of a reversing valve, and has a sealing surface 201, the profile of the sealing surface 201 is the same as that of the mounting port, the sealing surface 201 is provided with a shaft hole 202 and a reversing hole 203, the reversing hole 203 is provided through the end cover along the thickness direction, and the reversing hole 203 is provided at least with two, the distance between the center of the shaft hole 202 and the center of the two reversing holes 203 is the same, the two reversing holes 203 have an excircle locus, the center of the excircle locus coincides with the center of the shaft hole 202, the excircle locus has two tangent points with the two reversing holes 203, the excircle locus is divided into a first locus line and a second locus line by the two tangent points, the first locus line is located in the sealing surface 201, and at least part of the second locus line is located outside the sealing surface 201.

[0032] The first track line is located in the sealing surface 201, and at least part of the second track line is located outside the sealing surface 201. In this way, the rotation switching of the valve core 30 can be ensured. The end cover in the prior art is usually machined into a center-symmetrical structure, and the center of symmetry is on the rotation axis of the valve core. Therefore, the first track line and the second track line are both located in the sealing surface 201. Compared with the end cover in the prior art, in the present application, at least part of the second track line is located outside the sealing surface 201, so that the area of the sealing surface 201 of the end cover is smaller, and the end cover is subjected to smaller pressure of the fluid in the valve cavity. The above arrangement reduces the possibility of deformation of the end cover, reduces the possibility of gap between the end cover and the valve core 30, and further reduces the possibility of fluid flow between the fluid in the valve core 30 and the fluid in the valve cavity 101, and reduces the possibility of fluid leakage at the connection between the end cover and the valve body 10, thereby improving the switching effect of the directional valve.

[0033] In some embodiments of the present application, the number of switching holes 203 is greater than two.

[0034] When the number of switching holes 203 is greater than two, the valve core 30 can be selectively communicated with two switching holes 203, that is, the distance between the center of the shaft hole 202 and the center of the two switching holes 203 is the same, and the remaining switching holes 203 are respectively communicated with the space inside the valve body 10.

[0035] When the valve core 30 is selectively communicated with at least three switching holes 203, the at least three switching holes 203 are spaced apart along the circumferential direction of the shaft hole 202, the distance between the center of the shaft hole 202 and the center of the corresponding switching hole 203 is the same, the corresponding switching holes 203 have a common circumscribed circle track, and the center of the circumscribed circle track coincides with the center of the shaft hole 202. In the rotation direction of the valve core 30, the circumscribed circle track has a tangent point between the two switching holes 203 at the most end, and the circumscribed circle track is divided into a first track line and a second track line by the tangent point of the two switching holes 203 at the most end. The first track line is located in the sealing surface 201, and at least part of the second track line is located outside the sealing surface 201.

[0036] The present embodiment is described with two switching holes 203.

[0037] It can be understood that the two reversing holes 203 also have a first tangent circular track with a radius smaller than that of the outer tangent circular track, the center of the first tangent circular track coincides with the center of the shaft hole 202, the first tangent circular track has first tangent points with the two reversing holes 203, the first tangent circular track is divided into a third track line and a fourth track line by the two first tangent points, and the third track line is arranged close to the first track line. After the reversing valve is assembled, the spool 30 has a reversing end that moves relative to the end cover around the circumferential end of the shaft hole 202 to switch positions between the two reversing holes 203, specifically reciprocating along the first track line. The first track line is approximately equivalent to the outer contour line of the movement track of the reversing end of the spool 30, and the third track line is approximately equivalent to the inner contour line of the movement track of the reversing end of the spool 30. That is, the end cover of the present scheme is equivalent to cutting part of the structure of the end cover in the prior art, which reduces the area of the sealing surface 201, reduces the stress area of the end cover, and reduces the possibility of deformation of the end cover under the premise of ensuring the sealing effect and not interfering with the movement of the spool 30. In FIG. 1, track line a is the first track line; track line b is the second track line; track line c is the third track line; and track line d is the fourth track line.

[0038] Specifically, the reversing valve assembled with the end cover of the present scheme has a reversing end of the spool 30 that switches positions between the two reversing holes 203, and the movement track thereof is not a complete circular structure. In this way, the time for switching positions of the reversing end can be reduced, and the switching efficiency can be improved.

[0039] In an embodiment of the present scheme, the arc of the first track line is a, and a≤π.

[0040] In some embodiments of the present scheme, a=π, and the center of the shaft hole 202 and the centers of the two reversing holes 203 are collinear.

[0041] In another embodiment of the present scheme, a<π, and the center of the shaft hole 202 is located on the side close to the second track line of the line connecting the centers of the two reversing holes 203.

[0042] The present scheme does not specifically limit the shape of the contour of the sealing surface 201.

[0043] In some embodiments of the present scheme, the sealing surface 201 of the present scheme is an axisymmetric structure, and the axis of symmetry of the sealing surface 201 is the perpendicular bisector of the line connecting the centers of the two reversing holes 203.

[0044] In some embodiments of the present scheme, the contour line of the sealing surface 201 can be arranged as a polygonal structure, such as a rectangle, a hexagon, etc.

[0045] In the embodiment of the present scheme, the profile line of the sealing surface 201 comprises mutually connected circular arc segments and straight line segments 2013. When the profile line of the sealing surface 201 comprises mutually connected circular arc segments and straight line segments, the circular arc segments can comprise mutually connected main circular arc segments 2011 and transition circular arc segments 2012, the radius of the main circular arc segments 2011 is greater than the radius of the transition circular arc segments 2012, and the center of the main circular arc segments 2011 is located outside the line connecting the two end points of the main circular arc segments 2011 and inside the sealing surface 201. Two transition circular arc segments 2012 are symmetrically arranged at the two ends of the main circular arc segments 2011, and the two ends of the transition circular arc segments 2012 are connected with the straight line segments 2013 and the main circular arc segments 2011, respectively. The line connecting the centers of the two switching holes 203 is parallel to the straight line segments 2013, the transition circular arc segments 2012 are coaxial with the switching holes 203 close to them, that is, the transition circular arc segments 2012 are parallel to part of the profile line of the switching holes 203 close to them, and the second trajectory line intersects the transition circular arc segments 2012. In this way, the circular arc segments can be connected with the straight line segments 2013 as smoothly as possible, facilitating the machining of the end cover.

[0046] When the profile line of the sealing surface 201 comprises mutually connected circular arc segments and straight line segments 2013, the second trajectory line can also intersect the straight line segments, and the second trajectory line has two intersection points with the straight line segments.

[0047] Further, the end cover comprises a body portion 21 and a connecting portion 22 connected with each other, the connecting portion 22 is annularly arranged at the outer periphery of the sealing surface 201, the inner surface of the body portion 21 forms the sealing surface 201, and the connecting portion 22 is used to connect with the valve body 10. In this way, the assembly of the end cover and the valve body 10 can be facilitated, and the sealing effect of the end cover can be ensured.

[0048] In the embodiment of the present scheme, a first connecting hole is arranged on the connecting portion 22, and a plurality of first connecting holes are arranged at intervals along the circumference of the connecting portion 22. The arrangement of the first connecting hole facilitates the connection of the valve body 10 with the connecting portion 22 through fasteners.

[0049] Further, the sealing surface 201 protrudes from the side of the connecting portion 22 used to connect with the valve body 10. In this way, a stepped structure is formed between the connecting portion 22 and the body portion 21. When assembling the switching valve, the sealing surface 201 is inserted into the mounting port of the valve body 10, the stepped structure is limitedly matched with the end face of the end of the mounting port of the valve body 10, and the connecting portion 22 is located outside the valve body 10, facilitating the assembly of the end cover and the valve body 10.

[0050] As shown in FIGS. 1-5, the present application also provides a reversing valve, which comprises a valve body 10, a first end cover 20, a valve core 30 and a guide shaft 40. The valve body 10 has a valve cavity 101 and a first mounting port 102 which are in communication with each other, the first mounting port 102 is arranged at the end of the valve cavity 101, the valve body 10 is further provided with a first flow-through hole 103 and a second flow-through hole 104, the first flow-through hole 103 and the second flow-through hole 104 are respectively in communication with the valve cavity 101. The first end cover 20 is the end cover of the above-mentioned embodiment, the first end cover 20 is sealed at the first mounting port 102, the profile of the sealing surface 201 of the first end cover 20 is matched with the profile of the first mounting port 102, the two reversing holes 203 of the first end cover 20 are respectively in communication with the valve cavity 101, and the shaft hole 202 of the first end cover 20 is coaxial with the first flow-through hole 103.

[0051] The valve core 30 comprises a first opening 301, a flow-through channel 302 and a second opening 303 which are sequentially communicated, the first opening 301 and the second opening 303 have an included angle between the axial directions thereof, the first opening 301 is rotatably arranged at the first flow-through hole 103 and in communication with the first flow-through hole 103, the second opening 303 is selectively in communication with the two reversing holes 203, and the second opening 303 of the valve core 30 moves along a first trajectory line; the guide shaft 40 is coaxial with the first opening 301, one end of the guide shaft 40 is arranged on the valve core 30, and the other end is rotatably arranged in the shaft hole 202. In this way, the guide shaft 40 cooperates with the shaft hole 202 to improve the smoothness and stability of the rotation of the valve core 30.

[0052] As shown in FIGS. 3 and 5, further, the reversing valve further comprises a driving part and a driving gear 51 and a driven gear 52 which are in meshing engagement. The driving part is arranged on the valve body 10, the driving part has a driving shaft which is rotatably arranged in the valve cavity 101, the driving gear 51 is mounted on the driving shaft, and the driving gear 51 and the driven gear 52 are respectively rotatably arranged in the valve cavity 101, and the driven gear 52 is sleeved on the outer periphery of the first opening 301 of the valve core 30. In this way, the stability and smoothness of the driving of the valve core 30 can be improved.

[0053] The specific connection mode of the driven gear 52 and the valve core 30 is not limited in the present application. The connection can be achieved by fasteners, welding, riveting and the like.

[0054] As shown in FIGS. 3 and 6, in the embodiment of the present application, the inner peripheral surface of the driven gear 52 is provided with a clamping groove, and the peripheral surface of the one end of the valve core 30 having the first opening is provided with a clamping block which is clamped and matched with the clamping groove. In this way, the assembly of the driven gear 52 and the valve core 30 can be facilitated.

[0055] In some other embodiments of the present application, the clamping groove is arranged on the outer circumferential surface of one end of the valve core 30 with the first opening 301, and the clamping block is arranged on the inner circumferential surface of the driven gear 52.

[0056] The present application does not limit the number of the clamping groove and the clamping block matched with each other. In the embodiments of the present application, two groups of the clamping groove and the clamping block matched with each other are arranged, and the two groups of the clamping groove and the clamping block are distributed along the circumference of the driven gear 52.

[0057] As shown in FIGS. 7 and 8, further, the reversing valve further comprises a limiting structure arranged between the driven gear 52 and the valve body 10, and the limiting structure is used to limit the rotation angle of the valve core 30 relative to the valve body 10. In this way, the reversing precision of the reversing valve can be ensured, and the reversing effect can be improved.

[0058] Specifically, the valve body 10 comprises a main body part 11 and a second end cover 12. The main body part 11 has a valve cavity 101, a first mounting port 102, and a second flow-through hole 104. The main body part 11 is provided with a second mounting port 105 at one end away from the first mounting port 102, and the second mounting port 105 is in communication with the valve cavity 101. The second end cover 12 is arranged at the second mounting port 105, the first flow-through hole 103 is arranged on the second end cover 12, and the limiting structure is arranged between the driven gear 52 and the second end cover 12. In this way, the assembly of the reversing valve can be facilitated.

[0059] In the embodiments of the present application, the limiting structure comprises a limiting recess 61 and a limiting part 62. The limiting recess 61 is arranged on the side of the second end cover 12 facing the valve cavity 101, and the limiting recess 61 is arranged in an arc shape and coaxially arranged with the first flow-through hole 103. The limiting part 62 is arranged on the driven gear 52 and movably arranged in the limiting recess 61, and the limiting part 62 is respectively limited and matched with both ends of the limiting recess 61 in the extension direction. In this way, the structure is simple, and the machining can be facilitated.

[0060] Specifically, the side of the second end cover 12 facing the valve cavity 101 is provided with an annular protrusion coaxial with the first flow-through hole 103, and the limiting recess 61 is formed on the end face of the annular protrusion away from the second end cover 12. The limiting recess 61 has two stop ends arranged opposite to each other in the extension direction, and the two stop ends are respectively limited and matched with the limiting part 62.

[0061] Specifically, the driven gear 52 is provided with a mounting hole, and the limiting part 62 comprises a limiting pin. One end of the limiting pin is arranged in the mounting hole and fixedly connected with the driven gear 52, and the other end of the limiting pin is located outside the mounting hole and limited and matched with the limiting recess 61.

[0062] In some other embodiments of the present application, the limiting recess 61 is arranged on the surface of the driven gear 52 close to the second end cover 12, and the limiting portion 62 is arranged on the inner end surface of the second end cover 12.

[0063] The reversing valve of the present application further comprises a first pipe flange 70, two first pipe flanges 70 are arranged on the outer surface of the first end cover 20, and the two first pipe flanges 70 are located at the outer periphery of the two reversing holes 203.

[0064] As shown in FIG. 3, further, the reversing valve further comprises a second pipe flange 80, the second pipe flange 80 is arranged on the outer surface of the second end cover 12, and the second pipe flange 80 is located at the outer periphery of the first flow-through hole 103.

[0065] As shown in FIG. 9, the reversing valve of the present application can also be equipped with a pipe. The pipe comprises a first pipe 91, a second pipe 92 and a third pipe 93, wherein two first pipes 91 are arranged in communication with the two first pipe flanges 70, the second pipe 92 is in communication with the second pipe flange 80, and the third pipe 93 is in communication with the second flow-through hole 104.

[0066] By applying the technical solution of the present application, under the premise of ensuring the sealing effect and the normal switching of the valve core 30 between the two reversing holes 203, the area of the sealing surface 201 of the first end cover 20 is minimized, the size of the force acting on the sealing surface 201 by the fluid is reduced, the situation that the sealing effect is reduced due to the deformation of the sealing surface 201 and the valve core 30 is avoided, the possibility of fluid flow between the valve core 30 and the fluid in the valve cavity 101 is reduced, the reversing effect of the reversing valve is improved, and at the same time, the possibility of leakage of the fluid in the valve cavity 101 through the gap between the first end cover 20 and the valve body 10 is reduced.

[0067] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation on the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component itself.

[0068] For purposes of the description hereinafter, spatial or directional terms, such as, for example, "above", "below", "top", "bottom", "upper", "lower", and the like, can be used where reference is made to one structure or feature in relation to other structures or features. It is to be understood that such spatial or directional terms are in fact intended to encompass different orientations of the device or feature in use or operation in addition to the orientation depicted in the figures. For example, if the device or feature is inverted, then the description "above" or "upper" in relation to other features or structures can be interpreted as "below" or "lower", respectively. Thus, the example term "above" can include both an "above" and "below" orientation. The structures can also be oriented in other ways (rotated 90 degrees or at other orientations) and the spatial or directional descriptions formulated accordingly.

Claims

1. An end cap characterized by, The end cover is used for being mounted at a mounting port of a valve body (10) of a reversing valve, the end cover has a sealing surface (201), the sealing surface (201) is provided with a shaft hole (202) and a reversing hole (203), the reversing hole (203) is provided through the end cover in the thickness direction, the reversing hole (203) is provided at least with two, the distance between the center of the shaft hole (202) and the center of the two reversing holes (203) is the same, the two reversing holes (203) have an excircle locus, the center of the excircle locus coincides with the center of the shaft hole (202), the excircle locus has two tangent points with the two reversing holes (203), the excircle locus is divided into a first locus line and a second locus line by the two tangent points, the first locus line is located in the sealing surface (201), and at least part of the second locus line is located outside the sealing surface (201).

2. The end cap of claim 1, wherein The arc of the first locus line is a, and a≤π.

3. The end cap of claim 1, wherein The profile of the sealing surface (201) comprises a circular arc segment and a straight line segment (2013) connected with each other, the first locus line is arranged close to the circular arc segment, and the second locus line has two intersection points with the straight line segment (2013); or the second locus line has two intersection points with the circular arc segment.

4. The end cap of claim 3, wherein, The circular arc segment comprises a main circular arc segment (2011) and a transition circular arc segment (2012) connected with each other, the radius of the main circular arc segment (2011) is greater than that of the transition circular arc segment (2012), the center of the main circular arc segment (2011) is located in the sealing surface (201), and the transition circular arc segment (2012) is provided with two, the two transition circular arc segments (2012) are arranged at two ends of the main circular arc segment (2011) respectively, and the two ends of the transition circular arc segment (2012) are connected with the straight line segment (2013) and the main circular arc segment (2011) respectively.

5. The end cap of claim 1, wherein The end cover comprises a body portion (21) and a connecting portion (22) connected with each other, the connecting portion (22) is annularly arranged at the outer periphery of the sealing surface (201), and the inner surface of the body portion (21) forms the sealing surface (201); and the connecting portion (22) is used for being connected with the valve body (10).

6. The end cap of claim 5, wherein, The sealing surface (201) protrudes from one side of the connecting portion (22) used for being connected with the valve body (10).

7. A reversing valve characterized by The reversing valve comprises: a valve body (10) having a valve cavity (101) and a first mounting port (102) in communication with each other, the first mounting port (102) is arranged at an end of the valve cavity (101), the valve body (10) is further provided with a first flow-through hole (103) and a second flow-through hole (104), and the first flow-through hole (103) and the second flow-through hole (104) are in communication with the valve cavity (101) respectively; A first end cover (20) is provided, which is the end cover according to any one of claims 1 to 6, is sealed at the first mounting port (102), the profile of the sealing surface (201) of the first end cover (20) is matched with the profile of the first mounting port (102), the two reversing holes (203) of the first end cover (20) are respectively communicated with the valve cavity (101), and the shaft hole (202) of the first end cover (20) is coaxial with the first flow-through hole (103); A valve core (30) is provided, which comprises a first opening (301), a flow-through channel (302) and a second opening (303) communicated in sequence, the first opening (301) is rotatably arranged at the first flow-through hole (103) and communicated with the first flow-through hole (103), the second opening (303) is selectively communicated with the two reversing holes (203), and the second opening (303) of the valve core (30) moves along the first trajectory line; A guide shaft (40) is coaxial with the first opening (301), one end of the guide shaft (40) is arranged on the valve core (30), and the other end is rotatably arranged in the shaft hole (202) of the end cover.

8. The reversing valve of claim 7, wherein, The reversing valve further comprises: A driving gear (51) and a driven gear (52) are meshed with each other, the driving gear (51) and the driven gear (52) are rotatably arranged in the valve cavity (101) respectively, and the driven gear (52) is sleeved on the outer periphery of the first opening (301) of the valve core (30).

9. The reversing valve of claim 8, wherein, The reversing valve further comprises: A limiting structure is arranged between the driven gear (52) and the valve body (10), and the limiting structure is used for limiting the rotation angle of the valve core (30) relative to the valve body (10).

10. The reversing valve of claim 9, wherein, The valve body (10) comprises: A main body part (11) having the valve cavity (101), the first mounting port (102) and the second flow-through hole (104), one end of the main body part (11) away from the first mounting port (102) is provided with a second mounting port (105), and the second mounting port (105) is communicated with the valve cavity (101); A second end cover (12) is arranged at the second mounting port (105), the first flow-through hole (103) is arranged on the second end cover (12), and the limiting structure is arranged between the driven gear (52) and the second end cover (12).

11. The reversing valve of claim 10, wherein, The limiting structure comprises: A limiting recess (61) is arranged on the side of the second end cover (12) facing the valve cavity (101), the limiting recess (61) is arranged in an arc shape, and the limiting recess (61) is coaxially arranged with the first flow-through hole (103); A limiting part (62) is arranged on the driven gear (52), the limiting part (62) is movably arranged in the limiting recess (61), and the limiting part (62) is respectively limited in cooperation with both ends of the extending direction of the limiting recess (61).

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