End cover and reversing valve

Abstract

The utility model provides an end cover and a reversing valve, the end cover is used for being installed at the position of an installation opening of a valve body of the reversing valve, the end cover is provided with a sealing face, the sealing face is provided with a shaft hole and reversing holes, the reversing holes penetrate through the end cover in the thickness direction, and the number of the reversing holes is at least two. The distances between the circle center of the shaft hole and the circle centers of the two reversing holes are the same, the two reversing holes are provided with an excircle track, the circle center of the excircle track coincides with the circle center of the shaft hole, the excircle track and the two reversing holes are provided with tangency points, the excircle track is divided into a first track line and a second track line by the two tangency points, the first track line is located in the sealing face, and the second track line is located in the sealing face. At least part of the second track line is located outside the sealing face. By means of the scheme, the problem that in the prior art, series flow may happen to a reversing valve can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and more specifically, to an end cover and a reversing valve. Background Art

[0002] The reversing valve plays an important role in the refrigeration system and has the function of controlling the flow direction of the refrigerant.

[0003] The existing reversing valve includes a valve body, a valve core and an end cover. Among them, the valve body has a valve cavity, a first flow hole, a second flow hole and an installation port. The first flow hole, the second flow hole and the installation port are respectively communicated with the valve cavity. The end cover is arranged at the installation port, and two independent reversing holes are arranged on the end cover, and the two reversing holes are respectively communicated with the valve cavity. The valve core is a hollow structure, and the valve core is rotatably arranged in the valve cavity. One end of the valve core is communicated with the first flow hole, and the other end can be selectively communicated with one of the two reversing holes to realize commutation.

[0004] In the prior art, in order to facilitate the processing and assembly of the end cover, it is usually processed into a centrally symmetric structure, and the center of symmetry is on the rotation axis of the valve core. However, for the end cover with the above shape, after it is assembled to the installation port of the valve body, the stress area is large, and it is easy to deform, which may easily lead to the possibility of fluid in the valve core and fluid in the valve cavity flowing through each other, affecting the sealing and commutation effects of the reversing valve. Summary of the Utility Model

[0005] The utility model provides an end cover and a reversing valve to solve the problem that fluid in the existing reversing valve may flow through each other.

[0006] According to one aspect of the utility model, an end cover is provided. The end cover is used to be installed at the installation port of the valve body of the reversing valve. The end cover has a sealing surface, and a shaft hole and a reversing hole are arranged on the sealing surface. The reversing hole penetrates through the end cover along the thickness direction, and at least two reversing holes are provided. The distance between the center of the shaft hole and the centers of two of the reversing holes is the same. The two reversing holes have an inscribed circle locus, and the center of the inscribed circle locus coincides with the center of the shaft hole. The inscribed circle locus and the two reversing holes have tangent points. The inscribed circle locus is divided into a first locus line and a second locus line by the two tangent points. The first locus line is located within the sealing surface, and at least part of the second locus line is located outside the sealing surface.

[0007] Further, the radian of the first locus line is a, and a ≤ π.

[0008] Further, the contour of the sealing surface includes an arc segment and a straight segment connected to each other. The first locus line is arranged close to the arc segment, and the second locus line has two intersections with the straight segment; or the second locus line has two intersections with the arc segment.

[0009] Further, the arc segment includes a main arc segment and a transition arc segment that are connected to each other. The radius of the main arc segment is greater than that of the transition arc segment. The center of the main arc segment is located outside the sealing surface. There are two transition arc segments, which are respectively arranged at both ends of the main arc segment. Both ends of the transition arc segment are respectively connected to the straight segment and the main arc segment.

[0010] Further, the end cover includes a body portion and a connecting portion that are connected to each other. The connecting portion is annularly arranged on the outer periphery of the sealing surface. The inner surface of the body portion forms the sealing surface. The connecting portion is used to connect with the valve body.

[0011] Further, the sealing surface protrudes from the side of the connecting portion for connecting with the valve body.

[0012] According to another aspect of the present invention, a reversing valve is provided. The reversing valve includes: a valve body having a valve cavity and a first mounting port that communicate with each other. The first mounting port is arranged at the end of the valve cavity. The valve body is further provided with a first flow hole and a second flow hole, and the first flow hole and the second flow hole communicate with the valve cavity respectively; a first end cover, which is the above-mentioned end cover. The first end cover plugs at the first mounting port. The contour of the sealing surface of the first end cover matches the contour of the first mounting port. The two reversing holes of the first end cover communicate with the valve cavity respectively. The shaft hole of the first end cover is coaxial with the first flow hole; a valve core, including a first opening, a flow passage and a second opening that are sequentially communicated. The first opening is rotatably arranged at the first flow hole and communicates with the first flow hole. The second opening can selectively communicate with the two reversing holes. The second opening of the valve core moves along a first trajectory line; a guide shaft, which is coaxial with the first opening. One end of the guide shaft is arranged on the valve core, and the other end is rotatably arranged in the shaft hole.

[0013] Further, the reversing valve further includes: a driving gear and a driven gear that mesh with each other. The driving gear and the driven gear are respectively rotatably arranged in the valve cavity. The driven gear is sleeved on the outer periphery of the first opening of the valve core.

[0014] Further, the reversing valve further includes: a limiting structure arranged between the driven gear and the valve body. The limiting structure is used to limit the rotation angle of the valve core relative to the valve body.

[0015] Further, the valve body includes: a main body portion having a valve cavity, a first mounting port and a second flow hole. A second mounting port is arranged at the end of the main body portion away from the first mounting port. The second mounting port communicates with the valve cavity; a second end cover arranged at the second mounting port. The first flow hole is arranged on the second end cover. The limiting structure is arranged between the driven gear and the second end cover.

[0016] Further, the limiting structure includes: a limiting concave portion provided on the inner end surface of the second end cover, the limiting concave portion is arranged in an arc shape and coaxially arranged with the first through hole; a limiting portion provided on the driven gear, the limiting portion is movably arranged in the limiting concave portion, and the limiting portion is respectively in limiting cooperation with both ends in the extending direction of the limiting concave portion.

[0017] Applying the technical solution of the present invention, the first trace line is located within the sealing surface, and at least a part of the second trace line is located outside the sealing surface. With such an arrangement, the rotational switching of the valve core can be ensured. The end covers in the prior art are usually processed into a centrally symmetric structure, and the center of symmetry is on the rotation axis of the valve core. Thus, both the first trace line and the second trace line will be located within the sealing surface. Compared with the end covers in the prior art, in this solution, since at least a part of the second trace line is located outside the sealing surface, the area of the sealing surface of the end cover is smaller, and the pressure of the fluid in the valve cavity on the end cover is smaller. The above arrangement reduces the possibility of deformation of the end cover, thereby reducing the possibility of fluid cross-flow between the fluid in the valve core and the fluid in the valve cavity, and at the same time reducing the possibility of fluid leakage at the connection between the end cover and the valve body, improving the commutation effect of the reversing valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The specification drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0019] Figure 1 The structural schematic diagram of the end cover provided by the embodiment of the present invention is shown;

[0020] Figure 2 The structural schematic diagram of the reversing valve provided by the embodiment of the present invention from the first perspective is shown;

[0021] Figure 3 The exploded structural schematic diagram of the reversing valve provided by the embodiment of the present invention is shown;

[0022] Figure 4 The structural schematic diagram of the reversing valve provided by the embodiment of the present invention from the second perspective is shown;

[0023] Figure 5 The partial structural cross-sectional view of the reversing valve provided by the embodiment of the present invention is shown;

[0024] Figure 6 The structural schematic diagram of the driven gear provided by the embodiment of the present invention is shown;

[0025] Figure 7 The structural schematic diagram of the second end cover provided by the embodiment of the present invention is shown;

[0026] Figure 8 The cross-sectional view of the driven gear provided by the embodiment of the present utility model is shown;

[0027] Figure 9 The structural schematic diagram of the reversing valve assembly connecting pipe provided by the embodiment of the present utility model is shown.

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

[0029] 10. Valve body; 101. Valve cavity; 102. First mounting port;

[0030] 103. First flow hole; 104. Second flow hole; 105. Second mounting port;

[0031] 11. Main body part; 12. Second end cover;

[0032] 201. Sealing surface; 2011. Main arc section; 2012. Transition arc section; 2013. Straight line section;

[0033] 202. Shaft hole; 203. Reversing hole;

[0034] 20. First end cover; 21. Body part; 22. Connecting part;

[0035] 30. Valve core; 301. First opening; 302. Flow channel; 303. Second opening;

[0036] 40. Guide shaft;

[0037] 51. Driving gear; 52. Driven gear;

[0038] 61. Limiting recess; 62. Limiting part;

[0039] 70. First connecting pipe flange;

[0040] 80. Second connecting pipe flange;

[0041] 91. First connecting pipe; 92. Second connecting pipe; 93. Third connecting pipe. Detailed implementation manners

[0042] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. The following description of at least one exemplary embodiment is actually illustrative only and in no way serves as any limitation to the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0043] As Figures 1 to 3 shown, an embodiment of the present utility model provides an end cover, which is used to be installed at the installation opening of the valve body 10 of a reversing valve. The end cover has a sealing surface 201, and the contour of the sealing surface 201 is the same as that of the installation opening. An axial hole 202 and a reversing hole 203 are arranged on the sealing surface 201. The reversing hole 203 penetrates through the end cover along the thickness direction, and at least two reversing holes 203 are provided. The distances between the center of the axial hole 202 and the centers of the two reversing holes 203 are the same. The two reversing holes 203 have an inscribed circle trajectory, and the center of the inscribed circle trajectory coincides with the center of the axial hole 202. The inscribed circle trajectory and the two reversing holes 203 have tangent points. The inscribed circle trajectory is divided into a first trajectory line and a second trajectory line by the two tangent points. The first trajectory line is located within the sealing surface 201, and at least part of the second trajectory line is located outside the sealing surface 201.

[0044] Applying the technical solution of the present utility model, the first trajectory line is located within the sealing surface 201, and at least part of the second trajectory line is located outside the sealing surface 201. With such a setting, the rotational switching of the valve core 30 can be ensured. The end cover in the prior art is usually processed into a centrally symmetric structure, and the symmetric center is on the rotation axis of the valve core. In this way, both the first trajectory line and the second trajectory line will be located within the sealing surface 201. Compared with the end cover in the prior art, in this solution, since at least part of the second trajectory line is located outside the sealing surface 201, the area of the sealing surface 201 of the end cover is smaller, and the pressure of the fluid in the valve cavity on the end cover is smaller. The above setting reduces the possibility of the end cover deforming, reduces the possibility of a gap being generated between the end cover and the valve core 30, thereby reducing the possibility of the fluid in the valve core 30 and the fluid in the valve cavity 101 flowing in series, and at the same time reducing the possibility of fluid leakage at the connection between the end cover and the valve body 10, improving the reversing effect of the reversing valve.

[0045] In some embodiments of this solution, the number of the reversing holes 203 is greater than two.

[0046] When the number of the reversing holes 203 is greater than two, the valve core 30 can be set to be selectively communicated with two of the reversing holes 203, that is, the distances between the center of the axial hole 202 and the centers of the two reversing holes 203 are the same, and the remaining reversing holes 203 are respectively communicated with the space inside the valve body 10.

[0047] When the valve core 30 is selectively communicated with at least three commutation holes 203, the at least three commutation holes 203 are circumferentially spaced along the circumferential direction of the shaft hole 202. The distances between the center of the shaft hole 202 and the centers of the corresponding commutation holes 203 are the same. The corresponding commutation holes 203 have a common circumscribed circle trajectory, and the center of the circumscribed circle trajectory coincides with the center of the shaft hole 202. Along the rotation direction of the valve core 30, there are tangent points between the circumscribed circle trajectory and the two commutation holes 203 at the outermost ends. The circumscribed circle trajectory is divided into a first trajectory line and a second trajectory line by the tangent points of the two commutation holes 203 at the outermost ends. The first trajectory line is located within the sealing surface 201, and at least part of the second trajectory line is located outside the sealing surface 201.

[0048] In this embodiment, the case of two commutation holes 203 will be described.

[0049] It can be understood that the two commutation holes 203 also have a first circumscribed circle trajectory. The radius of the first circumscribed circle trajectory is smaller than the radius of the circumscribed circle trajectory. The center of the first circumscribed circle trajectory coincides with the center of the shaft hole 202. There are first tangent points between the first circumscribed circle trajectory and the two commutation holes 203. The trajectory of the first circumscribed circle is divided into a third trajectory line and a fourth trajectory line by the two first tangent points. The third trajectory line is arranged close to the first trajectory line. After the directional control valve is assembled, the valve core 30 has a commutation end, and the commutation end moves relative to the end cover along the circumferential direction of the shaft hole 202 to switch positions between the two commutation holes 203, specifically reciprocating along the first trajectory line. The first trajectory line roughly corresponds to the outer contour line of the movement trajectory of the commutation end of the valve core 30, and the third trajectory line roughly corresponds to the inner contour line of the movement trajectory of the commutation end of the valve core 30. That is, the end cover of this solution is obtained by cutting off part of the structure on the basis of the end cover in the prior art. On the premise of ensuring the sealing effect and not interfering with the movement of the valve core 30, the area of the sealing surface 201 is reduced, the force-bearing area of the end cover is reduced, and the possibility of deformation of the end cover is reduced. Among them, Figure 1 Among them, the trajectory line a is the first trajectory line; the trajectory line b is the second trajectory line; the trajectory line c is the third trajectory line; the trajectory line d is the fourth trajectory line.

[0050] Specifically, for the directional control valve equipped with the end cover of this solution, when the commutation end of the valve core 30 switches positions between the two commutation holes 203, its movement trajectory is not a complete circular structure. Such a setting can reduce the time when the commutation end switches positions and improve the switching efficiency.

[0051] In the embodiment of this solution, the radian of the first trajectory line is a, and a ≤ π.

[0052] In some embodiments of this solution, when a = π, the centers of the shaft hole 202 and the two commutation holes 203 are collinear.

[0053] In some other embodiments of this solution, the center of the shaft hole 202 is located on the side of the connecting line of the centers of the two commutation holes 203 closer to the second track line.

[0054] This solution does not specifically limit the shape of the contour of the sealing surface 201.

[0055] In some embodiments of this solution, the sealing surface 201 of this solution is an axisymmetric structure, and the axis of symmetry of the sealing surface 201 is the perpendicular bisector of the connecting line of the centers of the two commutation holes 203.

[0056] In some embodiments of this solution, the contour line of the sealing surface 201 can be set as a polygonal structure, such as a rectangle, a hexagon, etc.

[0057] In the embodiments of this solution, the contour line of the sealing surface 201 includes an arc segment and a straight line segment 2013 connected to each other. When the contour line of the sealing surface 201 includes an arc segment and a straight line segment connected to each other, the arc segment can include a main arc segment 2011 and a transition arc segment 2012 connected to each other. The radius of the main arc segment 2011 is greater than the radius of the transition arc segment 2012, and the center of the main arc segment 2011 is located outside the connecting line of the two endpoints of the main arc segment 2011. There are two transition arc segments 2012, and the two transition arc segments 2012 are symmetrically arranged at both ends of the main arc segment 2011. The two ends of the transition arc segment 2012 are respectively connected to the straight line segment 2013 and the main arc segment 2011. The connecting line of the centers of the two commutation holes 203 is parallel to the straight line segment 2013, and the transition arc segment 2012 is coaxial with the commutation hole 203 close to it, that is, the part of the transition arc segment 2012 close to the commutation hole 203 is parallel, and the second track line intersects with the transition arc segment 2012. With such a setting, it can be ensured that the arc segment is as smoothly connected to the straight line segment 2013 as possible, which is convenient for realizing the processing of the end cover.

[0058] When the contour line of the sealing surface 201 includes an arc segment and a straight line segment 2013 connected to each other, the second track line can also intersect with the straight line segment, and the second track line and the straight line segment have two intersection points.

[0059] Furthermore, the end cover includes a body portion 21 and a connecting portion 22 connected to each other. The connecting portion 22 is annularly arranged on the outer periphery of the sealing surface 201, and the inner surface of the body portion 21 forms the sealing surface 201. The connecting portion 22 is used to connect with the valve body 10. With such a setting, it is convenient to realize the assembly of the end cover and the valve body 10, and ensure the sealing effect of the end cover.

[0060] In the embodiments of this solution, a first connection hole is provided on the connecting portion 22, and a plurality of first connection holes are arranged at intervals along the circumferential direction of the connecting portion 22. The setting of the first connection hole facilitates connecting the valve body 10 to the connecting portion 22 through fasteners.

[0061] Further, the sealing surface 201 protrudes from the side of the connecting portion 22 for connecting with the valve body 10. Such a setting forms a stepped structure between the connecting portion 22 and the main body portion 21. When assembling the reversing valve, the sealing surface 201 is inserted into the installation opening of the valve body 10, and the stepped structure is in limit fit with the end face of the end of the valve body 10 having the installation opening. The connecting portion 22 is located outside the valve body 10, facilitating the assembly of the end cover and the valve body 10.

[0062] As Figures 2 to 5 shown, an embodiment of the present invention also provides a reversing valve, which includes 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 installation opening 102 that communicate with each other. The first installation opening 102 is provided at the end of the valve cavity 101. The valve body 10 is further provided with a first flow hole 103 and a second flow hole 104, and the first flow hole 103 and the second flow hole 104 communicate with the valve cavity 101 respectively. The first end cover 20 is the end cover of the above embodiment. The first end cover 20 seals the first installation opening 102. The contour of the sealing surface 201 of the first end cover 20 is adapted to the contour of the first installation opening 102. The two reversing holes 203 of the first end cover 20 communicate with the valve cavity 101 respectively. The shaft hole 202 of the first end cover 20 is coaxial with the first flow hole 103.

[0063] The valve core 30 includes a first opening 301, a flow passage 302, and a second opening 303 that are sequentially connected. There is an included angle between the axial direction of the first opening 301 and the axial direction of the second opening 303. The first opening 301 is rotatably provided at the first flow hole 103 and communicates with the first flow hole 103. The second opening 303 can selectively communicate with the two reversing holes 203. 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 provided on the valve core 30, and the other end is rotatably provided in the shaft hole 202. Such a setting enables the guide shaft 40 to cooperate with the shaft hole 202, improving the smoothness and stability of the rotation of the valve core 30.

[0064] As Figure 3 and Figure 5 shown, further, the reversing valve further includes a driving gear 51 and a driven gear 52 that mesh with each other, and the reversing valve further includes a driving portion. The driving portion is provided on the valve body 10. The driving portion has a driving shaft, and the driving shaft is rotatably provided in the valve cavity 101. The driving gear 51 is installed on the driving shaft. The driving gear 51 and the driven gear 52 are respectively rotatably provided in the valve cavity 101. The driven gear 52 is sleeved on the outer periphery of the first opening 301 of the valve core 30. Such a setting can improve the stability and smoothness of driving the valve core 30.

[0065] This solution does not limit the specific connection method of the driven gear 52 and the valve core 30. Among them, connection can be achieved through fasteners, welding, riveting, etc.

[0066] As Figure 3 and 6 shown, in the embodiment of this solution, a clamping groove is provided on the inner peripheral surface of the driven gear 52, and a clamping block is provided on the circumferential surface of one end of the valve core 30 having a first opening. The clamping block is in clamping fit with the clamping groove. This setting facilitates the assembly of the driven gear 52 and the valve core 30.

[0067] In some other embodiments of this solution, the clamping groove is provided on the outer peripheral surface of one end of the valve core 30 having a first opening, and the clamping block is provided on the inner peripheral surface of the driven gear 52.

[0068] This solution does not limit the number of the mutually cooperating clamping groove and clamping block. In the embodiment of this solution, two sets of mutually cooperating clamping groove and clamping block are provided, and the two sets of clamping groove and clamping block are spaced along the circumferential direction of the driven gear 52.

[0069] As Figure 7 and Figure 8 shown, further, the reversing valve further includes a limiting structure, and the limiting structure is provided between the driven gear 52 and the valve body 10. The limiting structure is used to limit the rotation angle of the valve core 30 relative to the valve body 10. This setting can ensure the reversing accuracy of the reversing valve and improve the reversing effect.

[0070] Specifically, the valve body 10 includes a main body portion 11 and a second end cover 12. Among them, the main body portion 11 has a valve cavity 101, a first mounting port 102, and a second flow hole 104. A second mounting port 105 is provided at one end of the main body portion 11 away from the first mounting port 102, and the second mounting port 105 is communicated with the valve cavity 101; the second end cover 12 is provided at the second mounting port 105, a first flow hole 103 is provided on the second end cover 12, and the limiting structure is provided between the driven gear 52 and the second end cover 12. This setting facilitates the assembly of the reversing valve.

[0071] In the embodiment of this solution, the limiting structure includes a limiting recess 61 and a limiting portion 62. The limiting recess 61 is provided on the side of the second end cover 12 facing the valve cavity 101. The limiting recess 61 is provided in an arc shape and is coaxially arranged with the first flow hole 103; the limiting portion 62 is provided on the driven gear 52, and the limiting portion 62 is movably arranged in the limiting recess 61, and the limiting portion 62 is in limiting fit with both ends of the extending direction of the limiting recess 61 respectively. This setting has a simple structure and is convenient for processing.

[0072] Specifically, an annular protrusion coaxial with the first through-hole 103 is provided on one side of the second end cap 12 facing the valve cavity 101. A limiting recess 61 is formed on the end face of the end of the annular protrusion away from the second end cap 12. The limiting recess 61 has two stop ends oppositely arranged along the extending direction, and the two stop ends are respectively in stop and limiting cooperation with the limiting portion 62.

[0073] Specifically, a mounting hole is provided on the driven gear 52. The limiting portion 62 includes a limiting pin. One end of the limiting pin is inserted into the mounting hole and fixedly connected to the driven gear 52, and the other end of the limiting pin is located outside the mounting hole and is in limiting cooperation with the limiting recess 61.

[0074] In some other embodiments of this solution, the limiting recess 61 is provided on the surface of the driven gear 52 close to the second end cap 12, and the limiting portion 62 is provided on the inner end face of the second end cap 12.

[0075] The directional control valve of this solution further includes two first connecting pipe flanges 70. The two first connecting pipe flanges 70 are respectively provided on the outer surface of the first end cap 20, and the two first connecting pipe flanges 70 are respectively located on the outer circumferences of the two directional control holes 203.

[0076] As Figure 3 shown, further, the directional control valve further includes a second connecting pipe flange 80. The second connecting pipe flange 80 is provided on the outer surface of the second end cap 12, and the second connecting pipe flange 80 is located on the outer circumference of the first through-hole 103.

[0077] As Figure 9 shown, the directional control valve of this solution can also be assembled with connecting pipes. The connecting pipes include two first connecting pipes 91, a second connecting pipe 92, and a third connecting pipe 93. The two first connecting pipes 91 are respectively communicated with the two first connecting pipe flanges 70, the second connecting pipe 92 is communicated with the second connecting pipe flange 80, and the third connecting pipe 93 is communicated with the second through-hole 104.

[0078] Applying the technical solution of the present utility model, on the premise of ensuring the sealing effect and the normal switching of the valve core 30 between the two directional control holes 203, the area of the sealing surface 201 of the first end cap 20 is reduced as much as possible, the magnitude of the force exerted by the fluid on the sealing surface 201 is reduced, the situation of the reduction of the sealing effect with the valve core 30 due to the deformation of the sealing surface 201 is reduced, the possibility of the fluid in the valve core 30 and the fluid in the valve cavity 101 flowing through each other is reduced, the directional control effect of the directional control valve is improved, and at the same time, the possibility of the fluid in the valve cavity 101 leaking from the gap between the first end cap 20 and the valve body 10 is reduced.

[0079] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular forms are also intended to include the plural forms. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they specify the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0080] Unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions, and values set forth in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the specification. In all the examples shown and discussed herein, any specific values should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not require further discussion in subsequent drawings.

[0081] In the description of the present invention, it should be understood that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal", and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and thus cannot be construed as limiting the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0082] For ease of description, spatial relative terms such as "above", "over", "on the upper surface", "upper" etc. may be used herein to describe the spatial positional relationship of one device or feature to other devices or features as shown in the figures. It should be understood that the spatial relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, a device described as "above" or "over" other devices or structures will then be positioned "below" or "under" the other devices or structures. Thus, the exemplary term "above" can include both orientations of "above" and "below". The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations for the spatial relative descriptions used herein will be made accordingly.

[0083] In addition, it should be noted that the use of terms such as "first", "second" etc. to define components is only for the convenience of differentiating the corresponding components. Without further statement, the above terms have no special meaning, and thus should not be construed as limiting the protection scope of the present utility model.

[0084] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. An end cap, characterized in that: The end cover is used to be installed at the installation opening of the valve body (10) of the reversing valve, the end cover has a sealing surface (201), the sealing surface (201) is provided with an axial hole (202) and a reversing hole (203), the reversing hole (203) is arranged through the end cover in the thickness direction, at least two reversing holes (203) are arranged, the distance between the center of the axial hole (202) and the center of two of the reversing holes (203) is the same, the two reversing holes (203) have an external circular trajectory, the center of the external circular trajectory coincides with the center of the axial hole (202), the external circular trajectory and the two reversing holes (203) have a tangent point, the external circular trajectory is divided into a first trajectory line and a second trajectory line by the two tangent points, the first trajectory line is located inside the sealing surface (201), and at least part of the second trajectory line is located outside the sealing surface (201).

2. The end cap according to claim 1, characterized in that: The radian of the first trajectory line is a, where a≤π.

3. The end cap according to claim 1, characterized in that: The contour of the sealing surface (201) comprises an arc segment and a straight line segment (2013) connected to each other, the first trajectory line is arranged close to the arc segment, and the second trajectory line has two intersection points with the straight line segment (2013); or, the second trajectory line has two intersection points with the arc segment.

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

5. The end cap according to claim 1, characterized in that: The end cover comprises a main body portion (21) and a connecting portion (22) which are connected to each other. The connecting portion (22) is annularly arranged on the outer periphery of the sealing surface (201). The inner surface of the main body portion (21) forms the sealing surface (201). The connecting portion (22) is used to be connected to the valve body (10).

6. The end cap according to claim 5, characterized in that: The sealing surface (201) protrudes from a side of the connecting portion (22) used for connecting to the valve body (10).

7. A reversing valve, characterized in that: The reversing valve comprises: A valve body (10) having a valve cavity (101) and a first installation port (102) which are connected to each other, wherein the first installation port (102) is arranged at the end of the valve cavity (101), and the valve body (10) is also provided with a first flow hole (103) and a second flow hole (104), wherein the first flow hole (103) and the second flow hole (104) are respectively connected to the valve cavity (101); A first end cover (20), wherein the first end cover (20) is the end cover according to any one of claims 1 to 6, the first end cover (20) is sealed at the first mounting opening (102), the contour of the sealing surface (201) of the first end cover (20) is adapted to the contour of the first mounting opening (102), the two reversing holes (203) of the first end cover (20) are respectively connected to the valve cavity (101), and the axial hole (202) of the first end cover (20) is coaxial with the first flow hole (103); The valve core (30) comprises a first opening (301), a circulation channel (302) and a second opening (303) which are connected in sequence, wherein the first opening (301) is rotatably arranged at the first circulation hole (103) and is connected to the first circulation hole (103), and the second opening (303) is selectively connected to the two reversing holes (203), and the second opening (303) of the valve core (30) moves along the 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) of the end cover.

8. The reversing valve according to claim 7, characterized in that: The reversing valve also includes: A driving gear (51) and a driven gear (52) meshing with each other, the driving gear (51) and the driven gear (52) being rotatably disposed in the valve cavity (101), respectively, and the driven gear (52) being sleeved on the outer periphery of the first opening (301) of the valve core (30).

9. The reversing valve according to claim 8, characterized in that: 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 to limit the rotation angle of the valve core (30) relative to the valve body (10).

10. The reversing valve according to claim 9, characterized in that: The valve body (10) comprises: A main body (11) having the valve cavity (101), the first mounting port (102) and the second flow hole (104); a second mounting port (105) is provided at one end of the main body (11) away from the first mounting port (102); the second mounting port (105) is communicated with the valve cavity (101); The second end cover (12) is arranged at the second mounting opening (105), the first flow 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 according to claim 10, characterized in that: The limiting structure comprises: a limiting recess (61) disposed on a side of the second end cover (12) facing the valve cavity (101), the limiting recess (61) being arranged in an arc shape, and the limiting recess (61) being arranged coaxially with the first flow hole (103); A limiting portion (62) is arranged on the driven gear (52), and the limiting portion (62) is movably arranged in the limiting recess (61). The limiting portion (62) is respectively limitedly matched with two ends of the limiting recess (61) in the extension direction.

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