Piston structure, sliding block assembly and reversing valve

Abstract

The utility model relates to the technical field of valves, in particular to a piston structure, a sliding block assembly and a reversing valve. The piston structure comprises a piston assembly and a first fastener, and a through hole is formed in the piston structure. The first fastener comprises a head, a screw and a rotation stopping protrusion, the screw is connected to one end of the head, and the screw penetrates through the through hole and is used for connecting the piston assembly to the guide frame. The rotation stopping protrusion protrudes and is connected to the end face, close to the screw, of the head. The piston assembly is further provided with a rotation stopping groove, and when the piston assembly is locked to the guide frame through the first fastening piece, the rotation stopping protrusion can be clamped in the rotation stopping groove so as to prevent the first fastening piece from rotating in the screwing-out direction of the screw rod. According to the piston structure, the sliding block assembly and the reversing valve, the problem that when an existing piston structure and an existing guide frame vibrate seriously, threaded connection of screws fails or is loosened is solved.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a piston structure, a slider assembly and a reversing valve. Background Art

[0002] In the air-conditioning system, the reversing valve drives the slider to move through the guide frame inside the valve body, so that the slider can connect to different pipelines, thereby switching the flow direction of the refrigerant to change the cooling and heating modes of the air-conditioning system.

[0003] In traditional technology, the two ends of the guide frame are connected with a piston structure that cooperates with the valve body to facilitate the movement of the guide frame through pressure difference. The piston is usually connected to the guide frame through screws or other threads. However, when the reversing valve is used in an air-conditioning system under extremely vibrating working conditions, the screws may loosen slowly due to excessive vibration, resulting in the risk of failure of the connection between the piston and the guide frame. Utility Model Content

[0004] Based on this, it is necessary to provide a piston structure, a slider assembly and a reversing valve to solve the problem that the existing piston structure and guide frame are prone to cause the threaded connection of the screw to fail or become loose when vibrating strongly.

[0005] The present application provides a piston structure, which includes a piston assembly and a first fastener, wherein the piston assembly is provided with a through hole, and the first fastener includes a head and a screw, wherein the screw is connected to one end of the head, and the screw passes through the through hole, for threading the piston assembly to a guide frame; the first fastener also includes a stop protrusion, which protrudes from and is connected to the end surface of the head near the screw; wherein the piston assembly is also provided with a stop groove, and when the first fastener locks the piston assembly to the guide frame, the stop protrusion can be clamped in the stop groove to prevent the first fastener from rotating along the screw-out direction of the screw.

[0006] In one embodiment, the stop protrusion extends along the circumference of the first fastener, and the two ends of the stop protrusion along the circumference of the first fastener are defined as a first end and a second end respectively; along the screwing direction of the screw rod and from the first end to the second end, the vertical distance between the surface of the stop protrusion away from the head and the head gradually decreases.

[0007] In one embodiment, along the radial direction of the first fastener, the anti-rotation protrusion has an inner side and an outer side, the inner side is connected to the screw rod, and / or the outer side is arranged flush with the side surface of the head.

[0008] In one embodiment, there are multiple anti-rotation protrusions, and the multiple anti-rotation protrusions are distributed along the circumference of the first fastener; wherein the first end of each anti-rotation protrusion is correspondingly clamped in one of the anti-rotation grooves.

[0009] In one of the embodiments, along the circumference of the first fastener, the second end of one of the anti-rotation protrusions is connected to the first end of another of the anti-rotation protrusions.

[0010] In one of the embodiments, there are multiple through holes, and the multiple through holes are arranged at intervals on the piston assembly; wherein the number of the first fasteners is arranged in a one-to-one correspondence with the number of the through holes.

[0011] In one embodiment, the piston assembly includes a piston body and an outer baffle plate, wherein the outer baffle plate is arranged on a side of the piston body away from the guide frame; the outer baffle plate is provided with a connecting hole, and the piston body is provided with a matching hole, and the piston structure also includes a second fastener, which passes through the connecting hole and the matching hole to connect the outer baffle plate and the piston body; wherein the through hole passes through the outer baffle plate and the piston body.

[0012] In one embodiment, there are multiple connecting holes, and the multiple connecting holes are arranged at intervals along the circumference of the piston assembly; wherein the numbers of the matching holes and the second fasteners are arranged in a one-to-one correspondence with the number of the connecting holes.

[0013] In one embodiment, the head, the screw rod and the anti-rotation protrusion are an integrally formed structure; or, the anti-rotation protrusion is a cutting piece.

[0014] The present application also provides a slider assembly, which includes a slider, a guide frame and the piston structure described in any one of the above embodiments, the guide frame is sleeved on the circumference of the slider and connected to the slider, and the piston structure is connected to the opposite ends of the guide frame.

[0015] The present application also provides a reversing valve, which includes a valve body and the above-mentioned slider assembly, wherein the valve body has a valve cavity, and the slider assembly is movably disposed in the valve cavity.

[0016] Compared with the prior art, the piston structure, slider assembly and reversing valve provided by the present application are provided with a stop protrusion on the first fastener and a stop groove on the piston assembly, so that the first fastener rotates along the screw-in direction of the screw rod, and the stop protrusion on the first fastener can be clamped in the stop groove of the piston assembly. In addition, the clamping arrangement between the stop protrusion and the stop groove can prevent the first fastener from rotating in the screw-out direction, thereby realizing that the first fastener locks the piston assembly on the guide frame. Furthermore, when the piston assembly is vibrated and causes the first fastener to rotate in the screw-out direction, the groove wall of the stop groove can stop the stop protrusion on the first fastener, thereby limiting the rotation of the first fastener and preventing the first fastener from loosening, which greatly improves the connection reliability of the first fastener. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A schematic diagram of the connection of a piston structure according to an embodiment of the present application;

[0019] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0020] Figure 3 An exploded view of a piston structure according to an embodiment of the present application;

[0021] Figure 4 A schematic structural diagram of a first fastener according to an embodiment of the present application;

[0022] Figure 5 A side view of a first fastener according to an embodiment of the present application;

[0023] Figure 6 for Figure 5 Cross-sectional view at the middle BB.

[0024] The symbols in the figure mean the following:

[0025] 100. Piston structure; 10. Piston assembly; 101. Through hole; 102. Anti-rotation groove; 11. Piston body; 111. Matching hole; 12. Outer baffle; 121. Connecting hole; 20. First fastener; 21. Head; 22. Screw; 23. Anti-rotation protrusion; 231. First end; 232. Second end; 233. Inside; 234. Outside; 30. Second fastener; 200. Guide frame. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0028] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0030] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0031] In the air-conditioning system, the reversing valve drives the slider to move through the guide frame inside the valve body, so that the slider can connect to different pipelines, thereby switching the flow direction of the refrigerant to change the cooling and heating modes of the air-conditioning system.

[0032] In traditional technology, the two ends of the guide frame are connected with a piston structure that cooperates with the valve body to facilitate the movement of the guide frame through pressure difference. The piston is usually connected to the guide frame through screws or other threads. However, when the reversing valve is used in an air-conditioning system under extremely vibrating working conditions, the screws may loosen slowly due to excessive vibration, resulting in the risk of failure of the connection between the piston and the guide frame.

[0033] See also Figure 1-Figure 6 In order to solve the problem that the existing piston structure and guide frame are prone to failure of the screw thread connection or loose connection when the vibration is large, the present application provides a piston structure 100, which can be movably arranged in the valve cavity of the reversing valve, and is used to seal with the inner wall of the valve cavity. Among them, the piston structure 100 includes a piston assembly 10 and a first fastener 20, the piston assembly 10 is provided with a through hole 101, the first fastener 20 includes a head 21 and a screw 22, the screw 22 is connected to one end of the head 21, and the screw 22 passes through the through hole 101, which is used to thread the piston assembly 10 to the guide frame 200.

[0034] Furthermore, if Figure 2-Figure 6 As shown, the first fastener 20 further includes a rotation-stopping protrusion 23, which protrudes and is connected to the end surface of the head 21 close to the screw 22. The piston assembly 10 is also provided with a rotation-stopping groove 102. When the first fastener 20 locks the piston assembly 10 to the guide frame 200, the rotation-stopping protrusion 23 can be locked in the rotation-stopping groove 102 to prevent the first fastener 20 from rotating in the screwing-out direction of the screw 22.

[0035] It can be understood that, in the present application, the anti-rotation protrusion 23 is provided on the first fastener 20 and the anti-rotation groove 102 is provided on the piston assembly 10, so that the first fastener 20 rotates along the screw-in direction of the screw rod 22, and the anti-rotation protrusion 23 on the first fastener 10 can be clamped in the anti-rotation groove 102 of the piston assembly 10. In addition, the clamping arrangement between the anti-rotation protrusion 23 and the anti-rotation groove 102 can prevent the first fastener 20 from rotating along the screw-out direction of the screw rod 22, so that the first fastener 20 locks the piston assembly 10 on the guide frame 200. Further, when the piston assembly 10 is vibrated and the first fastener 20 has a tendency to rotate in the screw-out direction, the groove wall of the anti-rotation groove 102 can stop the anti-rotation protrusion 23 on the first fastener 20, thereby limiting the rotation of the first fastener 20, preventing the first fastener 20 from loosening, and greatly improving the connection reliability of the first fastener 20.

[0036] Furthermore, in one embodiment, the anti-rotation protrusion 23 extends along the circumference of the first fastener 20, and the two ends of the anti-rotation protrusion 23 along the circumference of the first fastener 20 are defined as a first end 231 and a second end 232. Along the screwing direction of the screw 22, and from the first end 231 to the second end 232, the vertical distance between the surface of the anti-rotation protrusion 23 away from the head 21 and the head 21 gradually decreases.

[0037] It can be understood that since the vertical distance between the surface of the anti-rotation protrusion 23 away from the head 21 and the head 21 gradually decreases along the screwing direction of the screw rod 22 and from the first end 231 to the second end 232, when the first fastener 20 locks the piston assembly 10 to the guide frame 200, it can prevent other parts of the anti-rotation protrusion 23 from abutting against the end surface of the piston assembly 10, thereby ensuring that the part of the first end 231 of the anti-rotation protrusion 23 away from the head 21 can smoothly extend into the anti-rotation groove 102, thereby achieving cooperation with the anti-rotation groove 102, which greatly reduces the difficulty of screwing the first fastener 20.

[0038] Specifically, when the first fastener 20 is about to be locked, the anti-rotation protrusion 23 on the first fastener 20 will interfere with the end surface of the piston assembly 10 and be located close to the corresponding anti-rotation groove 102. At this time, the first fastener 20 is further rotated in the screw-in direction, and the first end 231 of the anti-rotation protrusion 23 can be inserted into the anti-rotation groove 102 to achieve an anti-slip effect.

[0039] In other embodiments, a stop protrusion 23 with a smaller width along the circumference of the first fastener 20 may be directly used, as long as the stop protrusion 23 and the stop groove 102 can be limitedly matched.

[0040] In one embodiment, if Figure 4 and Figure 6As shown, along the radial direction of the first fastener 20 , the anti-rotation protrusion 23 has an inner side 233 and an outer side 234 , and the inner side 233 is connected to the screw rod 22 .

[0041] In this way, the connection strength between the anti-rotation protrusion 23 and the screw rod 22 is improved, and the possibility of the anti-rotation protrusion 23 breaking is greatly reduced.

[0042] Correspondingly, the anti-rotation groove 102 extends to the through hole 101 and communicates with the through hole 101 , so as to better cooperate and abut with the anti-rotation protrusion 23 .

[0043] Furthermore, in one embodiment, the outer side 234 of the anti-rotation protrusion 23 is flush with the side surface of the head 21. In this way, the width of the anti-rotation protrusion 23 along the radial direction of the first fastener 20 is effectively increased, so that the first end 231 of the anti-rotation protrusion 23 and the side wall of the anti-rotation groove 102 have a larger contact area, thereby improving the reliability of the limit. At the same time, the connection strength between the anti-rotation protrusion 23 and the head 21 is further improved.

[0044] Furthermore, in one embodiment, the head 21, the screw 22 and the anti-rotation protrusion 23 are an integrally formed structure, which is conducive to further improving the connection strength of the anti-rotation protrusion 23 and ensuring the overall structural strength of the first fastener 20. In addition, the processing steps are reduced, which can effectively improve the processing efficiency.

[0045] However, the present invention is not limited thereto. In other embodiments, the anti-rotation protrusion 23 may also be a cutting piece. For example, the anti-rotation protrusion 23 of a desired shape is cut at a corresponding position on the head 21, and the molding is simple.

[0046] In one embodiment, if Figure 4 and Figure 5 As shown, there are multiple anti-rotation protrusions 23, and the multiple anti-rotation protrusions 23 are distributed along the circumference of the first fastener 20. Among them, the first end 231 of each anti-rotation protrusion 23 is correspondingly clamped in a anti-rotation groove 102. In this way, the multiple anti-rotation protrusions 23 and the multiple anti-rotation grooves 102 cooperate with each other, and the limiting effect is better, which can further prevent the first fastener 20 from rotating and improve the locking stability of the first fastener 20.

[0047] As a preferred solution, a plurality of anti-rotation protrusions 23 are evenly distributed along the circumference of the first fastener 20 to improve the uniformity of force.

[0048] It should be noted that the number of anti-rotation grooves 102 may not correspond one-to-one to the number of anti-rotation protrusions 23, that is, the number of anti-rotation grooves 102 may be greater than or equal to the number of anti-rotation protrusions 23, as long as the anti-rotation protrusions 23 can be stuck in the anti-rotation grooves 102.

[0049] Furthermore, in one embodiment, along the circumference of the first fastener 20, the second end 232 of one anti-rotation protrusion 23 is connected to the first end 231 of another anti-rotation protrusion 23. In this way, under the same space conditions, the number of anti-rotation protrusions 23 can be further increased, and the limiting effect of the anti-rotation protrusions 23 and the anti-rotation grooves 102 can be improved.

[0050] In one embodiment, if Figure 1 and Figure 3 As shown, there are multiple through holes 101, and the multiple through holes 101 are arranged at intervals on the piston assembly 10. The number of the first fasteners 20 is arranged in a one-to-one correspondence with the number of the through holes 101. In this way, the connection strength between the piston assembly 10 and the guide frame 200 can be further improved, and the connection stability of the piston assembly 10 can be improved.

[0051] Specifically, the piston assembly 10 includes a piston body 11 and an outer baffle 12, wherein the outer baffle 12 is disposed on a side of the piston body 11 away from the guide frame 200. The through hole 101 passes through the outer baffle 12 and the piston body 11. In addition, the number of through holes 101 provided in this embodiment is two, and the two through holes 101 are rotationally symmetrically arranged relative to the axis of the piston assembly 10.

[0052] In order to improve the connection stability between the piston body 11 and the outer baffle 12, in one embodiment, as shown in FIG. Figure 3 As shown, the outer baffle plate 12 is provided with a connecting hole 121 , the piston body 11 is provided with a matching hole 111 , and the piston structure 100 further includes a second fastener 30 , which penetrates the connecting hole 121 and the matching hole 111 to connect the outer baffle plate 12 and the piston body 11 .

[0053] Furthermore, in one embodiment, there are multiple connecting holes 121, and the multiple connecting holes 121 are arranged at intervals along the circumference of the piston assembly 10. The numbers of the matching holes 111 and the second fasteners 30 are arranged in a one-to-one correspondence with the number of the connecting holes 121. In this way, the connection strength between the piston body 11 and the outer baffle 12 is further improved.

[0054] Specifically, in this embodiment, the number of the connecting holes 121 and the matching holes 111 are both two. However, it is not limited thereto. In other embodiments, the number of the connecting holes 121 and the matching holes 111 can also be set to three, four or more, etc., which are not listed here one by one.

[0055] The present application also provides a slider assembly, which includes a slider, a guide frame 200 and the piston structure 100 described in any one of the above embodiments, the guide frame 200 is sleeved on the circumference of the slider and connected to the slider, and the piston structure 100 is connected to the opposite ends of the guide frame 200.

[0056] The present application also provides a reversing valve, which includes a valve body and the above-mentioned slider assembly. The valve body has a valve cavity, and the slider assembly is movably disposed in the valve cavity.

[0057] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0058] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A piston structure, characterized in that: The invention comprises a piston assembly (10) and a first fastener (20), wherein the piston assembly (10) is provided with a through hole (101), and the first fastener (20) comprises a head (21) and a screw rod (22), wherein the screw rod (22) is connected to one end of the head (21), and the screw rod (22) passes through the through hole (101), and is used for connecting the piston assembly (10) to a guide frame (200); The first fastener (20) further comprises a rotation-stopping protrusion (23), wherein the rotation-stopping protrusion (23) protrudes from and is connected to an end surface of the head (21) close to the screw rod (22); The piston assembly (10) is also provided with a stop groove (102). When the first fastener (20) locks the piston assembly (10) to the guide frame (200), the stop protrusion (23) can be clamped in the stop groove (102) to prevent the first fastener (20) from rotating in the direction of screwing out the screw rod (22).

2. The piston structure according to claim 1, characterized in that: The anti-rotation protrusion (23) extends along the circumference of the first fastener (20), and two ends of the anti-rotation protrusion (23) along the circumference of the first fastener (20) are defined as a first end (231) and a second end (232); Along the screwing direction of the screw rod (22), and in the direction from the first end (231) to the second end (232), the vertical distance between the surface of the anti-rotation protrusion (23) away from the head (21) and the head (21) gradually decreases.

3. The piston structure according to claim 2, characterized in that: Along the radial direction of the first fastener (20), the anti-rotation protrusion (23) has an inner side (233) and an outer side (234), the inner side (233) is connected to the screw rod (22), and / or the outer side (234) is arranged flush with the side surface of the head (21).

4. The piston structure according to claim 2, characterized in that: The number of the anti-rotation protrusions (23) is multiple, and the multiple anti-rotation protrusions (23) are distributed along the circumference of the first fastener (20); Wherein, the first end portion (231) of each of the anti-rotation protrusions (23) is correspondingly clamped in one of the anti-rotation grooves (102).

5. The piston structure according to claim 4, characterized in that: Along the circumference of the first fastener (20), the second end portion (232) of one of the anti-rotation protrusions (23) is connected to the first end portion (231) of the other anti-rotation protrusion (23).

6. The piston structure according to claim 1, characterized in that: The through holes (101) are multiple in number, and the multiple through holes (101) are arranged at intervals on the piston assembly (10); Wherein, the number of the first fasteners (20) and the number of the through holes (101) are arranged in a one-to-one correspondence.

7. The piston structure according to claim 1, characterized in that: The piston assembly (10) comprises a piston body (11) and an outer baffle plate (12), wherein the outer baffle plate (12) is arranged on a side of the piston body (11) away from the guide frame (200); The outer baffle plate (12) is provided with a connecting hole (121), the piston body (11) is provided with a matching hole (111), and the piston structure further comprises a second fastener (30), the second fastener (30) penetrates the connecting hole (121) and the matching hole (111) to connect the outer baffle plate (12) and the piston body (11); Wherein, the through hole (101) passes through the outer baffle (12) and the piston body (11).

8. The piston structure according to claim 7, characterized in that: The number of the connecting holes (121) is plural, and the connecting holes (121) are arranged at intervals along the circumference of the piston assembly (10); Wherein, the number of the matching holes (111) and the second fasteners (30) are arranged in one-to-one correspondence with the number of the connecting holes (121).

9. The piston structure according to claim 1, characterized in that: The head (21), the screw rod (22) and the anti-rotation protrusion (23) are an integrally formed structure; Alternatively, the anti-rotation protrusion (23) is a cutting piece.

10. A slider assembly, characterized in that: It comprises a slider, a guide frame (200) and a piston structure as described in any one of claims 1 to 9, wherein the guide frame (200) is sleeved on the circumference of the slider and connected to the slider, and the piston structure is connected to the opposite ends of the guide frame (200).

11. A reversing valve, characterized in that: The invention comprises a valve body and a slider assembly as claimed in claim 10, wherein the valve body has a valve cavity, and the slider assembly is movably disposed in the valve cavity.

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