Four-way valve

Abstract

The four-way valve includes: a main valve (10) having a valve chamber (11), a high-pressure passage (12), and a low-pressure passage (13); a valve seat (20) fixedly provided within the valve chamber (11) and corresponding to the low-pressure passage (13), the valve seat (20) having a plurality of fluid holes (21) arranged in an array, with a maximum inner-wall distance between the two most distant fluid holes (21) being L; and a slider (30) movably provided on the valve seat (20), the slider (30) having a length dimension L1, pressure relief notches (31) being symmetrically provided at both ends along the length direction of the slider (30), the pressure relief notches (31) being located on a surface of the slider (30) facing the valve seat (20), the sealing dimension of the slider (30) being L2, where L1>L>L2. This four-way valve increases the force receiving area by increasing the length of the slider, thereby preventing blow-by of the fluid and ensuring the normal operation of the fluid.

Description

[Technical field]

[0001] This application claims priority to a patent application filed with the State Intellectual Property Office of China on February 8, 2021, bearing application number 202120354746.8 and entitled "Four-way Valve".

[0002] The present invention relates to the technical field of valve bodies, and in particular to four-way valves. [Background technology]

[0003] At present, in four-way valves, the design of the slider size is generally based on the size of the valve seat, and there is no industry standard. In the process of installing the four-way valve, the four-way valve is installed upside down to facilitate the connection of the piping. During the operation process, especially in the frequency conversion system, the flow rate may be insufficient when the compressor operates at a low frequency, resulting in insufficient thrust on the slider of the high-pressure piping, causing a vertical gap between the slider and the valve seat, and furthermore, the intake and exhaust of the compressor will cause blow-by due to the four-way valve, causing system failure. Summary of the Invention

[0004] The present invention provides a four-way valve for solving the problem in the prior art that a vertical gap is likely to exist between the slider and the valve seat.

[0005] The present invention provides a four-way valve including: a main valve having a valve chamber, a high pressure passage and a low pressure passage, the high pressure passage and the low pressure passage being located on either side of a main valve, the high pressure passage and the low pressure passage both communicating with the valve chamber; a valve seat fixedly provided within the valve chamber and provided corresponding to the low pressure passage, the valve seat having a plurality of fluid holes arranged in an array, the maximum inner wall distance between the two most distant fluid holes being L; and a slider movably provided on the valve seat, the length dimension of the slider being L1, pressure relief notches being symmetrically provided on both ends along the length direction of the slider, the pressure relief notches being located on the surface of the slider facing the valve seat, the sealing dimension of the slider being L2, where L1>L>L2.

[0006] Furthermore, the difference between L and L2 is between 0 and 8 mm.

[0007] Furthermore, there are a first pressure relief passage and a second pressure relief passage which are connected to each other between the slider and the valve seat, the first pressure relief passage is formed by a radial gap between the fluid hole and the pressure relief notch, and the second pressure relief passage is formed by an axial gap between the pressure relief notch and a surface of the valve seat, the flow area of ​​the first pressure relief passage is S1, the fluid area of ​​the second pressure relief passage is S2, and when the vertical centerline of the slider and the vertical centerline of the valve seat overlap, S2≧S1.

[0008] Furthermore, the width of the valve seat is B1, the width of the slider is B2, and B2≧B1.

[0009] Furthermore, a step structure is provided on the surface of the slider facing the valve seat, and the step structures are located at both ends of the slider, respectively, and the step structures form a pressure relief notch.

[0010] Furthermore, the main valve is further provided with a plurality of fluid outlets, and the plurality of fluid outlets and the low pressure passage are arranged in an array.

[0011] Furthermore, one of the plurality of fluid holes is connected to the low pressure passage, and the other fluid holes are connected to the fluid outlets in one-to-one correspondence.

[0012] Furthermore, the axis of the low pressure passage and the axis of the high pressure passage overlap each other.

[0013] When the technical aspects of the present invention are applied, the four-way valve includes a main valve, a valve seat, and a slider, and a plurality of fluid holes are arranged in the valve seat. The maximum inner wall distance between the two most distant fluid holes is L, the length of the slider is L1, and the sealing dimension of the slider is L2, with L1>L>L2. By increasing the length of the slider, the force-receiving area of ​​the slider can be increased. This ensures that even when the pressure difference between the high pressure passage and the low pressure passage is relatively small, a sufficient thrust can still be provided to the slider so that the slider and the valve seat are in close contact with each other, and further prevents blow-by of the fluid and ensures normal operation of the fluid. [Brief description of the drawings]

[0014] The drawings in the specification which form a part of this application are intended to provide a further understanding of the present invention, and the schematic examples of the present invention and the explanations thereof are intended to interpret the present invention and are not intended to unduly limit the present invention.

[0015] [Figure 1] 1 shows a schematic diagram of the structure of a four-way valve provided in the present invention. [Diagram 2] FIG. 2 shows an enlarged view of a portion A in FIG. [Diagram 3] 2 shows a dimensional relationship between the valve seat and the slider in FIG. 1. [Figure 4] The structure of the valve seat in FIG. 1 is shown. [Diagram 5] FIG. 2 shows a schematic diagram of the structure of the slider in FIG. [Figure 6] FIG. 2 shows a bottom view of the slider in FIG. [Figure 7] FIG. 2 is a front view of the slider in FIG.

[0016] Wherein the above drawings include the following reference numbers: 10 main valve, 11 valve chamber, 12 high pressure passage, 13 low pressure passage, 14 fluid outlet, 20 valve seat, 21 fluid hole, 30 slider, 31 pressure relief notch, 41 first pressure relief passage, 42 second pressure relief passage. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, the technical aspects of the embodiments of the present invention will be described clearly and completely with reference to the drawings in the embodiments of the present invention, but it is clear that the described embodiments are only a part of the embodiments of the present invention, and are not all of the embodiments. The following description of at least one exemplary embodiment is for illustrative purposes only and does not constitute any limitation on the present invention and its application or use. All other embodiments that a person skilled in the art can obtain based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0018] 1 to 3, the four-way valve provided in the embodiment of the present invention includes a main valve 10, a valve seat 20, and a slider 30. Here, the main valve 10 has a valve chamber 11, a high pressure passage 12, and a low pressure passage 13, the high pressure passage 12 and the low pressure passage 13 are respectively located on both sides of the main valve 10, and the high pressure passage 12 and the low pressure passage 13 are both communicated with the valve chamber 11. The valve seat 20 is fixedly installed in the valve chamber 11 and is installed corresponding to the low pressure passage 13. The valve seat 20 has a plurality of fluid holes 21 arranged in an array, and the maximum inner wall distance between the two most distant fluid holes 21 is defined as L. The slider 30 is movably mounted on the valve seat 20, the length dimension of the slider 30 is L1, pressure relief notches 31 are symmetrically provided at both ends along the length of the slider 30, the pressure relief notches 31 are located on the surface of the slider 30 facing the valve seat 20, and a sealing portion is formed by the middle part of the slider 30, the sealing dimension of this slider 30 is L2, where L1>L>L2.

[0019] According to the four-way valve provided by the present application, the valve seat 20 includes a main valve 10, a valve seat 20, and a slider 30, and the valve seat 20 is provided with a plurality of fluid holes 21 arranged in an array. The maximum inner wall distance between the two most distant fluid holes 21 is L, the length of the slider 30 is L1, and the sealing dimension of the slider 30 is L2, and L1>L>L2 is set. By increasing the length of the slider 30, the force-receiving area of ​​the slider 30 can be increased, so that even when the pressure difference between the high pressure passage 12 and the low pressure passage 13 is reduced, sufficient thrust can still be provided to the slider 30, ensuring that the slider 30 and the valve seat 20 are tightly attached to each other, preventing blow-by of the fluid and ensuring normal operation of the fluid. In addition, by making L2 smaller than L, when the slider 30 moves to the middle portion, the slider 30 covers all the fluid holes 21 at the same time, which prevents the pressure in the chamber of the main valve 10 from becoming too high, which can prevent malfunctions such as valve body deformation. When the slider 30 is moved to the middle portion, the fluid holes 21 at both ends are connected to the valve chamber 11 through the pressure relief notches 31 on both sides of the slider 30, thereby solving the problem of pressure relief.

[0020] As shown in FIG. 4, in this embodiment, the valve seat 20 is provided with three fluid holes 21, and the maximum inner wall distance between the two most distant fluid holes 21 is the farthest distance between the inner walls of the first fluid hole and the third fluid hole. By making L1 larger than L, it is possible to ensure that the slider 30 covers all of the fluid holes 21, and the force-receiving area of ​​the slider 30 can also be increased by increasing L1.

[0021] Specifically, the difference between L and L2 is set to between 0 and 8 mm. If the difference between L and L2 is too small, the pressure relief effect is relatively poor, and if the difference is too large, it affects the sealing and switching effects. Therefore, by setting the difference between L and L2 to between 0 and 8 mm, not only the pressure relief effect can be ensured, but also the sealing effect during switching can be ensured. In this embodiment, the difference between L and L2 is set to 5 mm.

[0022] 1 and 2, there are a first pressure relief passage 41 and a second pressure relief passage 42 between the slider 30 and the valve seat 20, the first pressure relief passage 41 is formed by a radial gap between the fluid hole 21 and the pressure relief notch 31, the second pressure relief passage 42 is formed by an axial gap between the pressure relief notch 31 and the surface of the valve seat 20, the flow area of ​​the first pressure relief passage 41 is S1, the flow area of ​​the second pressure relief passage 42 is S2, and when the vertical center line of the slider 30 and the vertical center line of the valve seat 20 overlap, S2≧S1. By making S2 equal to or larger than S1, it is possible to ensure that the fluid can smoothly communicate between the fluid hole 21 and the valve chamber 11, and the pressure relief effect when the slider 30 is located at the middle of the valve seat 20 is further ensured.

[0023] 5, the surface of the slider 30 facing the valve seat 20 is a stepped surface, with the middle part of the slider 30 being higher and both ends being lower, and this stepped structure forms the pressure relief notch 31. Referring to Fig. 2, a radial gap between the side of the stepped structure and the inner wall of the fluid hole 21 forms a first pressure relief passage 41, and an axial gap between the stepped surface of the stepped structure and the surface of the valve seat 20 forms a second pressure relief passage 42.

[0024] 4 and 6, the width of the valve seat 20 is B1, and the width of the slider 30 is B2, where B2≧B1. Through the above design, the force-bearing area of ​​the slider 30 can be further increased, and the slider 30 and the valve seat 20 can be brought into close contact with each other due to the thrust received by the slider 30, so as to meet the movement and switching requirements of the slider 30.

[0025] Specifically, the main valve 10 is further provided with a plurality of fluid outlets 14, and the plurality of fluid outlets 14 and the low pressure passage 13 are arranged in an array. In this embodiment, the main valve 10 is provided with two fluid outlets 14, which are located on either side of the low pressure passage 13 and engage with the valve seat 20 via the slider 30, thereby realizing communication between the two fluid outlets 14 and the valve chamber 11.

[0026] In this embodiment, one of the multiple fluid holes 21 is connected to the low pressure passage 13, and the other fluid holes 21 are connected to the fluid outlets 14 in a one-to-one correspondence. By connecting the fluid hole 21 to the low pressure passage 13 or the fluid outlet 14, it is possible to complete switching between the multiple fluid outlets 14 and the valve chamber 11 when the slider 30 moves across the valve seat 20. Specifically, three fluid holes 21 are provided, the low pressure passage 13 is connected to the fluid hole 21 in the middle, and the fluid outlets 14 on both sides of the low pressure passage 13 are connected to the fluid holes 21 on both sides, respectively.

[0027] Here, the axis of the low pressure passage 13 and the axis of the high pressure passage 12 may be parallel to each other, or may overlap. In this embodiment, the axis of the low pressure passage 13 and the axis of the high pressure passage 12 overlap. This allows the fluid to flow uniformly into the valve chamber 11, ensuring a stable flow of the fluid.

[0028] It should be noted that the terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form, and it should be further understood that when the terms "comprise" and / or "comprise" are used herein, it means that features, steps, operations, devices, assemblies, and / or combinations thereof are present.

[0029] Unless otherwise specifically described, the relative arrangement of the components and steps, the formulas and values ​​described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for convenience of description, the dimensions of each part shown in the drawings are not drawn in actual proportion. Although detailed descriptions of techniques, methods and equipment known to those skilled in the art may be omitted, the techniques, methods and equipment should be considered as part of the approved specification, as necessary. In all examples proposed and described herein, any specific values ​​should be interpreted as being merely illustrative and not limiting. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar symbols and letters represent similar things in the following drawings, so that once something is defined in one drawing, there is no need to further describe it in the subsequent drawings.

[0030] In describing the present invention, it should be understood that orientations or positional relationships indicated by directional terms such as "front, back, up, down, left, right", "lateral, longitudinal, vertical, horizontal" and "top, bottom" are based on the orientations or positional relationships shown in the drawings, and are merely for facilitating and simplifying the description of the present invention, and unless otherwise stated, these directional terms do not indicate or imply that the devices or elements shown necessarily have a specific orientation or are configured and operated in a specific orientation, and therefore should not be understood as limiting the scope of protection of the present invention, and the directional terms "inside, outside" are inside and outside with respect to the contour of each member itself.

[0031] For ease of description, spatially relative terms such as "on," "above," "on top of," "above," and the like may be used herein to describe the spatial location of one device or feature relative to another device or feature as depicted in the drawings. It should be understood that the spatially relative terms are intended to encompass different orientations during use or operation other than the orientation depicted in the drawings of the device. For example, if a device in the drawings is turned upside down, a device described as "above other devices or structures" or "on top of other devices or structures" would then be positioned "below other devices or structures" or "below other devices or structures." Thus, the exemplary term "above" can include two orientations: "above" and "below." The device may be positioned in other different ways (rotated 90 degrees or in other orientations) and a corresponding interpretation made of the spatially relative descriptions used herein.

[0032] It should be further explained that the use of terms such as "first", "second", etc. to define parts is merely for the purpose of easily distinguishing corresponding parts, and unless otherwise specified, the above terms have no special meaning and should not be understood as limiting the scope of protection of the present invention.

[0033] The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. a main valve (10) having a valve chamber (11), a high pressure passage (12) and a low pressure passage (13), the high pressure passage (12) and the low pressure passage (13) being located on either side of the main valve (10), the high pressure passage (12) and the low pressure passage (13) both communicating with the valve chamber (11); a valve seat (20) fixedly provided within the valve chamber (11) and provided corresponding to the low pressure passage (13), the valve seat (20) having a plurality of fluid holes (21) arranged in an array, the maximum inner wall distance between two of the fluid holes (21) that are furthest apart being L; a slider (30) movably mounted on the valve seat (20), the slider (30) having a length dimension L1, pressure relief notches (31) symmetrically provided at both ends along the length direction of the slider (30), the pressure relief notches (31) being located on a surface of the slider (30) facing the valve seat (20), the slider (30) having a sealing dimension L2, where L1>L>L2; a first pressure relief passage (41) and a second pressure relief passage (42) are provided between the slider (30) and the valve seat (20) and are in communication with each other, the first pressure relief passage (41) is formed by a radial gap between the fluid hole (21) and the pressure relief notch (31), the second pressure relief passage (42) is formed by an axial gap between the pressure relief notch (31) and a surface of the valve seat (20), a flow area of ​​the first pressure relief passage (41) is S1, a fluid area of ​​the second pressure relief passage (42) is S2, and when a vertical center line of the slider (30) and a vertical center line of the valve seat (20) overlap, S2≧S1; A tapered structure is provided on a surface of the fluid hole (21) facing the slider (30), The tapered structure constitutes the first pressure relief passage (41).

2. 2. The four-way valve according to claim 1, wherein the difference between L and L2 is greater than 0 mm and smaller than 8 mm.

3. 2. The four-way valve according to claim 1, wherein a width dimension of the valve seat (20) is B1, a width dimension of the slider (30) is B2, and B2 ≥ B1.

4. 2. The four-way valve according to claim 1, wherein a step structure is provided on a surface of the slider (30) facing the valve seat (20), the step structures being located at both ends of the slider (30), and the pressure relief notch (31) is formed by the step structures.

5. 2. The four-way valve according to claim 1, wherein the main valve (10) is further provided with a plurality of fluid outlets (14), and the plurality of fluid outlets (14) and the low pressure passage (13) are arranged in an array.

6. 6. The four-way valve according to claim 5, wherein one of the plurality of fluid holes (21) is connected to the low pressure passage (13), and the other fluid holes (21) are connected to the fluid outlets (14) in one-to-one correspondence.

7. 7. The four-way valve according to claim 6, wherein an axis of the low pressure passage (13) and an axis of the high pressure passage (12) overlap.

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