Reversing valve and air conditioning system

Abstract

This application relates to the field of directional control valve technology, and in particular to a directional control valve and an air conditioning system. The directional control valve includes a valve body, a valve seat, and multiple connecting pipes. The valve body has multiple first connecting holes. The valve seat is located within the valve body and has multiple second connecting holes, each corresponding to one of the first connecting holes. Each connecting pipe passes through a corresponding first and second connecting hole. The valve seat has an arc-shaped surface and a flat surface. The arc-shaped surface fits against the inner wall of the valve body and is welded to it. The flat surface is located on the arc-shaped surface, is planar, parallel to the central axis of the valve body, and extends along the length of the valve seat to both ends. The directional control valve and air conditioning system provided by this application solve the problem of excessive assembly clearance between the arc-shaped surface of the valve seat and the valve body, leading to poor welding between the valve seat and the valve body.

Description

Technical Field

[0001] This application relates to the field of directional valve technology, and in particular to a directional valve and an air conditioning system. Background Technology

[0002] In air conditioning systems, reversing valves are mainly used to change the flow path of fluids, thereby switching between cooling and heating modes. A typical reversing valve includes a valve body, a valve seat, a slider, and a connecting pipe. The valve seat is installed within the valve body, and the slider is slidably mounted on the valve seat. Both the valve body and valve seat have through-holes for the connecting pipe, which passes through these holes and communicates with internal chambers within the valve body or on the slider.

[0003] Currently, the valve seat surface is designed as an arc surface for fitting and fixing to the inner wall of the valve body. However, due to the influence of the machining accuracy of the arc surface on the valve seat, such as the warping defects that are easy to occur on the arc surface during machining, the straightness of the arc surface is poor. Poor straightness of the arc surface will lead to excessive local gaps at the fitting position after the valve seat and valve body are assembled, which can easily cause welding defects during the welding process. Utility Model Content

[0004] Therefore, it is necessary to provide a reversing valve and air conditioning system to solve the problem of excessive assembly clearance between the arc surface on the existing valve seat and the valve body, which leads to poor welding of the valve seat and valve body.

[0005] This application provides a reversing valve, which includes a valve body, a valve seat, and multiple connecting pipes. The valve body has multiple first connecting holes, and the valve seat is disposed in the valve body. The valve seat has multiple second connecting holes, which are arranged in a one-to-one correspondence with the multiple first connecting holes. Each connecting pipe passes through a corresponding first connecting hole and a second connecting hole. The surface of the valve seat has an arc surface and a flat surface. The arc surface fits against the inner wall of the valve body and is welded and fixed to the valve body. The flat surface is disposed on the arc surface. The flat surface is planar and parallel to the central axis of the valve body, and extends along the length direction of the valve seat to both ends of the valve seat.

[0006] In one embodiment, at least a portion of the plane of the planar portion intersects with the inner wall of the second connection hole.

[0007] In one embodiment, the planar portion is located at the middle of the arcuate surface along the width direction of the valve seat.

[0008] In one embodiment, the maximum distance from the planar portion to the arc of the arc surface along the radial direction of the arc surface is L, and 0.05mm≤L≤0.5mm.

[0009] In one embodiment, 0.1mm ≤ L ≤ 0.2mm.

[0010] In one embodiment, the number of the planar portions is multiple, and the multiple planar portions are arranged at circumferential intervals along the arc surface.

[0011] In one embodiment, the planar portion is configured as a milled structure or a ground structure.

[0012] In one embodiment, a permeation groove is formed in the recess on the arc surface, the permeation groove being used to allow solder to flow during the welding of the valve seat and the valve body.

[0013] In one embodiment, the valve seat is connected to three pipes, which are respectively defined as pipe E, pipe S, and pipe C. The reversing valve also includes pipe D, which is disposed opposite to pipes E, S, and C and connected to the valve body. The reversing valve also includes a slider, a guide frame, and a piston. The slider is slidably disposed on the valve seat. The guide frame is sleeved on the outer periphery of the slider. The piston is connected to opposite ends of the guide frame and is in a movable sealing fit with the inner wall of the valve body. The piston can respond to external force to drive the guide frame and the slider to move, so that the slider connects pipe E and pipe S, or connects pipe S and pipe C.

[0014] This application also provides an air conditioning system, which includes the reversing valve described in any of the above embodiments.

[0015] Compared with the prior art, the reversing valve and air conditioning system provided in this application improve the straightness of the valve seat surface by setting a flat part on the arc surface, and the flat part is set as a plane parallel to the central axis of the valve body. That is, the flat part is equivalent to cutting off the surface area with a higher height formed by warping during the original arc surface, thereby improving the straightness of the arc surface. In this way, when the arc surface is in contact with the inner wall of the valve body, a uniform gap can be formed between the flat part and the inner wall of the valve body, eliminating the fit gap difference caused by the poor straightness of the arc surface, effectively avoiding poor welding, and improving the connection quality between the valve seat and the valve body. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the conventional technology, the drawings used in the description of the embodiments or the conventional technology will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1A cross-sectional view of a reversing valve according to an embodiment of this application;

[0018] Figure 2 A side view of a reversing valve according to an embodiment of this application;

[0019] Figure 3 A schematic diagram of the structure of a valve seat according to an embodiment provided in this application;

[0020] Figure 4 A schematic diagram of the valve seat according to another embodiment provided in this application;

[0021] Figure 5 A side view of a valve seat according to an embodiment provided in this application.

[0022] The symbols in the diagram represent the following meanings:

[0023] 100. Reversing valve; 10. Valve body; 101. First connection hole; 102. Connecting cavity; 103. Drive cavity; 20. Valve seat; 201. Second connection hole; 202. Permeation tank; 21. Arc surface; 22. Flat part; 30. Connecting pipe; 31. E pipe; 32. S pipe; 33. C pipe; 34. D pipe; 40. Slider; 50. Guide frame; 60. Piston. Detailed Implementation

[0024] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0025] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on the other component or there may be an intermediate component. When a component is considered to be "connected to" another component, it can be directly connected to the other component or there may be an intermediate component present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used in this application's specification are for illustrative purposes only and do not represent the only possible implementation.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature and the second feature are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0028] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used in this application includes any and all combinations of one or more of the associated listed items.

[0029] In air conditioning systems, reversing valves are mainly used to change the flow path of fluids, thereby switching between cooling and heating modes. A typical reversing valve includes a valve body, a valve seat, a slider, and a connecting pipe. The valve seat is installed within the valve body, and the slider is slidably mounted on the valve seat. Both the valve body and valve seat have through-holes for the connecting pipe, which passes through these holes and communicates with internal chambers within the valve body or on the slider.

[0030] Currently, the valve seat surface is designed as an arc surface for fitting and fixing to the inner wall of the valve body. However, due to the influence of the machining accuracy of the arc surface on the valve seat, such as the warping defects that are easy to occur on the arc surface during machining, the straightness of the arc surface is poor. Poor straightness of the arc surface will lead to excessive local gaps at the fitting position after the valve seat and valve body are assembled, which can easily cause welding defects during the welding process.

[0031] Please see Figures 1-5To address the problem of excessive clearance between the arc surface of the valve seat and the valve body in existing valves, leading to poor welding of the valve seat and valve body, this application provides a reversing valve 100. The reversing valve 100 includes a valve body 10, a valve seat 20, and multiple connecting pipes 30. The valve body 10 has multiple first connecting holes 101. The valve seat 20 is located inside the valve body 10 and has multiple second connecting holes 201, each corresponding to one of the first connecting holes 101. Each connecting pipe 30 passes through a corresponding first connecting hole 101 and second connecting hole 201. The surface of the valve seat 20 has an arc surface 21 and a flat surface 22. The arc surface 21 fits against the inner wall of the valve body 10 and is welded to the valve body 10. One end of each second connecting hole 201 penetrates the arc surface 21. The flat portion 22 is provided on the arc surface 21. The flat portion 22 is planar and parallel to the central axis of the valve body 10, and the flat portion 22 extends along the length direction of the valve seat 20 to both ends of the valve seat 20.

[0032] It is understood that by providing a flat portion 22 on the arc surface 21, and setting the flat portion 22 as a plane parallel to the central axis of the valve body 10, this application can improve the straightness of the valve seat 20 surface. That is, the flat portion 22 is equivalent to reducing the surface area with a higher height formed by warping or other factors during the original arc surface 21, thereby improving the straightness of the arc surface 21. In this way, when the arc surface 21 is attached to the inner wall of the valve body 10, a uniform gap can be formed between the flat portion 22 and the inner wall of the valve body 10, eliminating the fit gap difference caused by the poor straightness of the arc surface 21, effectively avoiding poor welding, and improving the connection quality between the valve seat 20 and the valve body 10.

[0033] Specifically, the flat part 22 can be configured as a milling structure or a grinding structure, and the flat surface is machined on the arc surface 21 by milling or grinding. The overall machining is simple and can improve machining efficiency.

[0034] Typically, when machining the first connection hole 101 on the valve body 10, burrs inevitably form near the opening of the first connection hole 101 close to the inner wall of the valve body 10. This results in poor fit between the valve seat 20 and the valve body 10 due to the burrs, leading to uneven welding gaps and reduced welding effect. Therefore, to reduce the impact of burrs on welding, in one embodiment, such as... Figures 2-4 As shown, at least a portion of the plane of the flat portion 22 intersects with the inner wall of the second connecting hole 201. That is, when the valve seat 20 and the valve body 10 are fitted together, the gap formed by the flat portion 22 will contact the first connecting hole 101. This gap can effectively avoid burrs or even warped parts generated during the processing of the first connecting hole 101 on the valve body 10, thereby improving the fitting effect between the valve seat 20 and the valve body 10, improving the assembly accuracy, and ensuring the reliability of the welding.

[0035] Furthermore, in one embodiment, as Figure 3 and Figure 4 As shown, the flat portion 22 is located at the center of the arc surface 21 along the width direction of the valve seat 20. When the valve seat 20 is assembled onto the valve body 10, due to the processing technology, the valve body 10 has the most burrs at the center of the arc surface 21 corresponding to the valve seat 20. Therefore, placing the flat portion 22 at the center of the arc surface 21 can accommodate more burrs, thereby further improving the fit between the valve seat 20 and the valve body 10 and preventing burrs from squeezing the valve seat 20 and causing deviation in the fit between the valve seat 20 and the valve body 10. In this way, the alignment accuracy of the first connecting hole 101 and the second connecting hole 201 can be effectively improved, and the gap between the valve seat 20 and the valve body 10 can be made uniform, so that the two can be welded firmly.

[0036] Specifically, such as Figure 5 As shown, along the radial direction of the arc surface 21, the maximum distance from the flat portion 22 to the arc where the arc surface 21 is located is L, and 0.05mm≤L≤0.5mm. It is easy to understand that when L>0.5mm, the gap between the flat portion 22 and the inner wall of the valve body 10 is large, and the solder is prone to forming hot cracks after cooling, thus reducing the welding effect between the valve body 10 and the valve seat 20. When L<0.05mm, the gap between the flat portion 22 and the inner wall of the valve body 10 is too small, the flat portion 22 cannot completely eliminate the height difference on the arc surface 21, and the gap corresponding to the flat portion 22 has insufficient capacity to accommodate burrs. The valve seat 20 still has a significant risk of warping relative to the valve body 10, which is detrimental to improving the welding effect between the valve seat 20 and the valve body 10.

[0037] Preferably, the value of L can be set to 0.1mm ≤ L ≤ 0.2mm. This results in a better fit between the valve seat 20 and the valve body 10, thereby further improving the reliability of the weld between them. The value of L can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, or 0.5mm, etc.

[0038] To further avoid the adverse effects of poor straightness of the arc surface 21 on the fit between the valve seat 20 and the valve body 10, in one embodiment, there are multiple planar portions 22, which are arranged at intervals along the circumference of the arc surface 21. Thus, by providing multiple spaced-apart planar portions 22, the height difference on the arc surface 21 can be further eliminated, and a larger area of ​​the first contact hole 101 can be covered, thereby accommodating more burrs and reducing the impact of burrs on the fit between the valve seat 20 and the valve body 10.

[0039] In one embodiment, such as Figure 4As shown, a penetration groove 202 is recessed on the arc surface 21. The penetration groove 202 is used to allow solder to flow during the welding of the valve seat 20 and the valve body 10. In this way, during the welding of the valve seat 20 and the valve body 10, the molten solder can more easily penetrate into the space between the arc surface 21 of the valve seat 20 and the inner wall of the valve body 10 through the penetration groove 202, which helps to improve the solder penetration rate, thereby greatly improving the welding strength between the valve seat 20 and the valve body 10. At the same time, it can also eliminate the gap between the valve seat 20 and the valve body 10, preventing refrigerant from leaking from the gap between the valve seat 20 and the valve body 10, and improving the safety of the reversing valve 100.

[0040] Specifically, the permeation groove 202 can be configured as a wire drawing groove or other structure, and preferably covers the entire arc surface 21. Of course, it can also be set in a part of the arc surface 21 according to actual needs. When processing the valve seat 20, the permeation groove 202 can be rolled out on the valve seat 20 first, and then the flat part 22 can be processed by grinding or milling, which simplifies the overall processing.

[0041] In one embodiment, such as Figure 1 As shown, the valve seat 20 is connected to three pipes 30, which are defined as pipe E 31, pipe S 32, and pipe C 33, respectively. Pipes E 31, S 32, and C 33 are arranged sequentially along the axial direction of the valve body 10. The directional valve 100 also includes pipe D 34, which is arranged opposite to pipes E 31, S 32, and C 33 and is connected to the valve body 10.

[0042] Furthermore, the directional valve 100 also includes a slider 40, a guide frame 50, and a piston 60. The slider 40 is slidably mounted on the valve seat 20, the guide frame 50 is sleeved on the outer periphery of the slider 40, and the piston 60 is connected to the opposite ends of the guide frame 50, and the piston 60 is in a movable sealing fit with the inner wall of the valve body 10. The piston 60 can respond to external force to move the guide frame 50 and the slider 40, so that the slider 40 connects to the E pipe 31 and the S pipe 32, or connects to the S pipe 32 and the C pipe 33.

[0043] It is understandable that, since both pistons 60 are in a movable sealing fit with the inner wall of the valve body 10, the two pistons 60 can divide the internal space of the valve body 10 into three chambers. The chamber located between the two pistons 60 is defined as the connecting chamber 102, and the other two chambers are defined as the driving chambers 103. At this time, by introducing or discharging the medium into the two driving chambers 103, the pressure difference across the two ends of the connecting chamber 102 can be changed, thereby driving the piston 60, the guide frame 50, and the slider 40 to move, thus realizing the reversal. For example, when the slider 40 moves to connect the E pipe 31 and the S pipe 32, the D pipe 34 and the C pipe 33 are connected through the connecting chamber 102, and when the slider 40 moves to connect the S pipe 32 and the C pipe 33, the D pipe 34 and the E pipe 31 are connected through the connecting chamber 102.

[0044] This application also provides an air conditioning system, which includes the reversing valve 100 of any of the above embodiments.

[0045] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above 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.

[0046] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the patent protection scope of this application should be determined by the appended claims.

Claims

1. A reversing valve, characterized in that, The device includes a valve body (10), a valve seat (20), and multiple connecting pipes (30). The valve body (10) has multiple first connecting holes (101). The valve seat (20) is located inside the valve body (10). The valve seat (20) has multiple second connecting holes (201). The multiple second connecting holes (201) are arranged in a one-to-one correspondence with the multiple first connecting holes (101). Each connecting pipe (30) is provided with a corresponding first connecting hole (101) and a second connecting hole (201). The valve seat (20) has an arc surface (21) and a flat surface (22) on its surface. The arc surface (21) fits against the inner wall of the valve body (10) and is welded and fixed to the valve body (10). The flat surface (22) is provided on the arc surface (21). The flat surface (22) is planar and parallel to the central axis of the valve body (10). The flat surface (22) extends along the length of the valve seat (20) to both ends of the valve seat (20).

2. The reversing valve according to claim 1, characterized in that, At least a portion of the plane of the flat portion (22) intersects with the inner wall of the second connecting hole (201).

3. The reversing valve according to claim 2, characterized in that, The flat portion (22) is located at the middle of the arc surface (21) along the width direction of the valve seat (20).

4. The reversing valve according to claim 1, characterized in that, Along the radial direction of the arc surface (21), the maximum distance from the flat portion (22) to the arc where the arc surface (21) is located is L, and 0.05mm≤L≤0.5mm.

5. The reversing valve according to claim 4, characterized in that, 0.1mm≤L≤0.2mm.

6. The reversing valve according to claim 1, characterized in that, The number of the planar portions (22) is multiple, and the multiple planar portions (22) are arranged at intervals along the circumference of the arc surface (21).

7. The reversing valve according to claim 1, characterized in that, The planar portion (22) is configured as a milling structure or a grinding structure.

8. The reversing valve according to claim 1, characterized in that, A penetration groove (202) is formed in the recess on the arc surface (21), and the penetration groove (202) is used to supply the flow of solder when the valve seat (20) and the valve body (10) are welded.

9. The reversing valve according to claim 1, characterized in that, The valve seat (20) is connected to three pipes (30), which are defined as pipe E (31), pipe S (32) and pipe C (33) respectively. The reversing valve also includes pipe D (34), which is arranged opposite to pipe E (31), pipe S (32) and pipe C (33) and connected to the valve body (10). The reversing valve also includes a slider (40), a guide frame (50), and a piston (60). The slider (40) is slidably disposed on the valve seat (20). The guide frame (50) is sleeved on the outer periphery of the slider (40). The piston (60) is connected to the opposite ends of the guide frame (50), and the piston (60) is in a movable sealing fit with the inner wall of the valve body (10). The piston (60) can respond to external force to drive the guide frame (50) and the slider (40) to move, so that the slider (40) connects the E tube (31) and the S tube (32), or connects the S tube (32) and the C tube (33).

10. An air conditioning system, characterized in that, Includes the reversing valve as described in any one of claims 1-9.

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