Switching valve

Abstract

The switching valve comprises a main valve, a guide valve, a sleeve and a filter part, an outward annular flange is arranged on the side wall of the main valve, a mounting hole is formed in the annular flange, the two ends of the sleeve are fixedly connected with the guide valve and the annular flange respectively, one end of the guide valve is provided with an end wall, the end wall is provided with a runner hole, the runner hole is communicated with a cavity in the main valve, and the filter part is arranged in the runner hole. And the filtering piece is matched with the end wall and shields the runner hole. In the scheme, the pilot valve is connected with the sleeve, and the sleeve is connected with the annular flange, so that the main valve is connected with the pilot valve; the main valve and the guide valve are communicated through the flow channel holes in the end wall, and the filtering piece is arranged to shield the flow channel holes, so that fluid flowing into the flow channel holes can be filtered, impurities are prevented from entering the guide valve, and the impurities are prevented from affecting normal work of the guide valve.

Description

Technical Field

[0001] The utility model relates to the technical field of switching valves, in particular to a switching valve. Background Art

[0002] A switching valve, such as a four-way valve, is used to change the direction of fluid flow. The switching valve mainly includes a main valve, a pilot valve, a connecting pipe, a capillary tube and other structures. In existing switching valves, the pilot valve and the main valve are usually connected by a specially provided bracket, that is, the bracket is installed on the main valve, and the pilot valve is installed on the bracket, and the pilot valve and the main valve are separated. This solution has many parts and is relatively costly. With the development of technology, in some solutions, such as CN202274174U, the bracket is cancelled and the pilot valve and the main valve are connected, which can reduce the number of parts and reduce costs.

[0003] However, after the pilot valve and the main valve are connected, the cavity of the pilot valve and the cavity of the main valve are directly connected, the fluid flow in the main valve is large, and impurities in the fluid inevitably enter the pilot valve. The structural parts in the pilot valve are small in size, and the impurities that enter may cause the pilot valve to get stuck or wear, affecting the normal operation of the pilot valve. Utility Model Content

[0004] The utility model provides a switching valve to solve the problem in the prior art that impurities in a main valve easily enter a pilot valve.

[0005] In order to solve the above problems, the utility model provides a switching valve, including a main valve, a pilot valve, a sleeve and a filter. The side wall of the main valve is provided with an outward annular flange, and a mounting hole is formed in the annular flange. The two ends of the sleeve are respectively fixedly connected to the pilot valve and the annular flange. One end of the pilot valve is provided with an end wall, and the end wall has a flow channel hole. The flow channel hole is connected to the cavity in the main valve, and the filter and the end wall cooperate with and block the flow channel hole.

[0006] Furthermore, the inner wall of the sleeve is welded to the pilot valve, and the outer wall of the sleeve is welded to the annular flange.

[0007] Further, the filter element is located between the end wall and the sleeve.

[0008] Furthermore, the sleeve has an annular end plate, the opening of the annular end plate corresponds to the flow channel hole, the filter element is a disc-shaped filter mesh, and the filter element is sandwiched between the annular end plate and the end wall.

[0009] Furthermore, the sleeve is in a cylindrical shape, the sleeve penetrates into the mounting hole, the outer diameter of the pilot valve is smaller than the diameter of the mounting hole, and the end wall and the filter element are both located in the mounting hole.

[0010] Alternatively, the sleeve includes an outer cylinder, an annular transition plate and an inner cylinder connected in sequence, the outer diameter of the outer cylinder is larger than the inner diameter of the annular flange, the inner cylinder is inserted into the mounting hole, one end of the pilot valve is inserted into the outer cylinder and fixedly connected to the outer cylinder, the outer diameter of the pilot valve is larger than the diameter of the mounting hole, the annular transition plate limits the axial position of the pilot valve, the annular transition plate and the end face limit of the annular flange cooperate, and the outer wall of the inner cylinder is fixedly connected to the inner wall of the annular flange.

[0011] Furthermore, the filter element is a disc-shaped filter screen, the diameter of the filter element is larger than the diameter of the inner cylinder, and the filter element is sandwiched between the end wall and the annular transition plate.

[0012] Alternatively, the sleeve further comprises a limiting structure, which is connected to an end of the inner cylinder away from the annular transition plate, the filter element is located in the inner cylinder, and the limiting structure limits the filter element.

[0013] Furthermore, the limiting structure is an annular flat plate structure, the filter element is barrel-shaped, and the flat plate structure limits the filter element.

[0014] Alternatively, the limiting structure is a conical shrinkage structure, the filter element is hemispherical, and the shrinkage structure limits the filter element.

[0015] The technical solution of the utility model is applied to provide a switching valve, including a main valve, a pilot valve, a sleeve and a filter. The side wall of the main valve has an outward annular flange, and a mounting hole is formed in the annular flange. The two ends of the sleeve are respectively fixedly connected to the pilot valve and the annular flange. One end of the pilot valve has an end wall, and the end wall has a flow channel hole. The flow channel hole is connected to the cavity in the main valve, and the filter cooperates with the end wall and blocks the flow channel hole. In this solution, the pilot valve is connected to the sleeve, and the sleeve is connected to the annular flange, so that the connection between the main valve and the pilot valve is realized; the connection between the main valve and the pilot valve is realized through the flow channel hole on the end wall. Since a filter is provided to block the flow channel hole, the fluid flowing into the flow channel hole can be filtered, so that impurities are prevented from entering the pilot valve, thereby preventing impurities from affecting the normal operation of the pilot valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0017] Figure 1 The schematic diagram of the structure of the switching valve provided by the utility model is shown;

[0018] Figure 2 A schematic diagram showing the main valve and the pilot valve in the connection area in the first embodiment of the utility model is shown;

[0019] Figure 3 Shows Figure 2Schematic diagram of the casing in;

[0020] Figure 4 Shows Figure 2 A schematic diagram of a filter element in FIG.

[0021] Figure 5 A schematic diagram showing the main valve and the pilot valve in the connection area in the second embodiment of the utility model is shown;

[0022] Figure 6 Shows Figure 5 Schematic diagram of the casing in;

[0023] Figure 7 A schematic diagram showing the main valve and the pilot valve in the connection area in the third embodiment of the present utility model is shown;

[0024] Figure 8 Shows Figure 7 Schematic diagram of the casing in;

[0025] Fig. 9 Shows Figure 7 Schematic diagram of the filter element in FIG.

[0026] The above drawings include the following reference numerals:

[0027] 10. Main valve; 101. Annular flange; 12. Mounting hole;

[0028] 20. pilot valve; 21. end wall; 22. flow channel hole;

[0029] 50. casing; 51. annular end plate; 52. outer cylinder; 53. annular transition plate; 54. inner cylinder; 55. limiting structure;

[0030] 80. Filter element. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0032] like Figures 1 to 9As shown, an embodiment of the utility model provides a switching valve, including a main valve 10, a pilot valve 20, a sleeve 50 and a filter 80. The side wall of the main valve 10 has an outward annular flange 101, and a mounting hole 12 is formed in the annular flange 101. The two ends of the sleeve 50 are respectively fixedly connected to the pilot valve 20 and the annular flange 101. One end of the pilot valve 20 has an end wall 21, and the end wall 21 has a flow channel hole 22. The flow channel hole 22 is connected to the cavity in the main valve 10, and the filter 80 cooperates with the end wall 21 to block the flow channel hole 22.

[0033] In this solution, the pilot valve 20 is connected to the sleeve 50, and the sleeve 50 is connected to the annular flange 101, thereby realizing the connection between the main valve 10 and the pilot valve 20; the main valve 10 and the pilot valve 20 are connected through the flow channel hole 22 on the end wall 21, and the filter 80 is provided to block the flow channel hole 22, so that the fluid flowing from the main valve 10 into the flow channel hole 22 can be filtered, thereby preventing impurities from entering the pilot valve 20, thereby preventing impurities from affecting the normal operation of the pilot valve 20. The provision of the end wall 21 facilitates the installation of the filter 80.

[0034] The main valve 10 includes a valve pipe, the mounting hole 12 is located in the valve pipe, and the valve pipe is an integrated structure.

[0035] Specifically, the inner wall of the sleeve 50 is welded to the pilot valve 20, and the outer wall of the sleeve 50 is welded to the annular flange 101. Alternatively, the end wall 21 is formed with a step that is recessed into the pilot valve 20, the outer wall of the sleeve 50 at one end facing the pilot valve 20 is welded to the step surface, and the other end of the sleeve 50 is welded to the annular flange 101. The welding method is reliable. The materials of the welding positions of the sleeve 50, the pilot valve 20 and the annular flange 101 can all be made of stainless steel, which has high welding strength and can be welded by furnace welding, which is efficient.

[0036] The filter element 80 is located between the end wall 21 and the sleeve 50. In this way, the filter element 80 can be reliably fixed.

[0037] like Figures 2 to 4 As shown, in some embodiments, the sleeve 50 has an annular end plate 51, the opening of the annular end plate 51 corresponds to the flow channel hole 22, and the filter element 80 is a disc-shaped filter mesh, and the filter element 80 is sandwiched between the annular end plate 51 and the end wall 21. With this arrangement, the structure is simple, the connection is reliable, and the filter element 80 is not easy to deform.

[0038] In this embodiment, the filter element 80 and the contacting annular end plate 51 and end wall 21 may be welded or not.

[0039] Specifically, the sleeve 50 is cylindrical, and the sleeve 50 penetrates the mounting hole 12. The outer diameter of the pilot valve 20 is smaller than the diameter of the mounting hole 12. The end wall 21 and the filter element 80 are both located in the mounting hole 12. The sleeve 50 is cylindrical, and is easy to process.

[0040] like Figures 5 to 9 As shown, in some embodiments, the sleeve 50 includes an outer cylinder 52, an annular transition plate 53 and an inner cylinder 54 connected in sequence, the outer diameter of the outer cylinder 52 is larger than the inner diameter of the annular flange 101, the inner cylinder 54 penetrates into the mounting hole 12, one end of the pilot valve 20 penetrates into the outer cylinder 52 and is fixedly connected to the outer cylinder 52, the outer diameter of the pilot valve 20 is larger than the diameter of the mounting hole 12, the annular transition plate 53 limits the axial position of the pilot valve 20, the annular transition plate 53 and the end face of the annular flange 101 are limited, and the outer wall of the inner cylinder 54 is fixedly connected to the inner wall of the annular flange 101.

[0041] With the above arrangement, the design of the pilot valve 20 is not limited by the size of the mounting hole 12, and the pilot valve 20 can be limited in the axial direction by the annular transition plate 53, which can improve the installation accuracy during assembly. In addition, the inner wall and end surface of the sleeve 50 and the annular transition plate 53 are connected, the contact area is large, and the connection strength is high.

[0042] Specifically, Figure 5 As shown, in a specific embodiment, the filter element 80 is a disc-shaped filter screen, the diameter of the filter element 80 is larger than the diameter of the inner cylinder 54, and the filter element 80 is sandwiched between the end wall 21 and the annular transition plate 53. In this way, the filter element 80 is reliably limited, and the filter element 80 is not easily deformed. In this embodiment, the filter element 80 and the contact structure can be welded or not.

[0043] like Figures 7 to 9 As shown, in another embodiment, the sleeve 50 further includes a limiting structure 55, which is connected to one end of the inner cylinder 54 away from the annular transition plate 53, and the filter element 80 is located in the inner cylinder 54, and the limiting structure 55 limits the filter element 80. That is, in this embodiment, the annular transition plate 53 directly limits the end wall 21, and the filter element 80 is limited by the inner cylinder 54 and the limiting structure 55.

[0044] The annular transition plate 53 may be in direct contact with the end wall 21 or may not be in direct contact with the end wall 21 . For example, the filter element 80 has an outwardly turned portion at its opening, and the outwardly turned portion is clamped between the annular transition plate 53 and the end wall 21 .

[0045] Specifically, the limiting structure 55 is an annular flat plate structure, the filter element 80 is a cylindrical shape, and the flat plate structure limits the filter element 80. Alternatively, in other embodiments not shown, the limiting structure 55 is a conical shrinking structure, the filter element 80 is a hemispherical shape, and the shrinking structure limits the filter element 80. All of the above solutions can achieve reliable limiting of the filter element 80.

[0046] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0047] 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 form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0048] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being only exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0049] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0050] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0051] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only to facilitate the distinction between corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

Claims

1. A switching valve, characterized in that: The invention comprises a main valve (10), a pilot valve (20), a sleeve (50) and a filter element (80); the side wall of the main valve (10) is provided with an outward annular flange (101); a mounting hole (12) is formed in the annular flange (101); two ends of the sleeve (50) are respectively fixedly connected to the pilot valve (20) and the annular flange (101); one end of the pilot valve (20) is provided with an end wall (21); the end wall (21) has a flow channel hole (22); the flow channel hole (22) is connected to a cavity in the main valve (10); the filter element (80) and the end wall (21) cooperate with and cover the flow channel hole (22).

2. The switching valve according to claim 1, characterized in that: The inner wall of the sleeve (50) is welded to the pilot valve (20), and the outer wall of the sleeve (50) is welded to the annular flange (101).

3. The switching valve according to claim 1, characterized in that: The filter element (80) is located between the end wall (21) and the sleeve (50).

4. The switching valve according to claim 3, characterized in that: The sleeve (50) has an annular end plate (51), the opening of the annular end plate (51) corresponds to the flow channel hole (22), the filter element (80) is a disc-shaped filter screen, and the filter element (80) is sandwiched between the annular end plate (51) and the end wall (21).

5. The switching valve according to claim 4, characterized in that: The sleeve (50) is cylindrical and penetrates into the mounting hole (12). The outer diameter of the pilot valve (20) is smaller than the diameter of the mounting hole (12). The end wall (21) and the filter element (80) are both located in the mounting hole (12).

6. The switching valve according to claim 1, characterized in that: The sleeve (50) comprises an outer cylinder (52), an annular transition plate (53) and an inner cylinder (54) which are connected in sequence. The outer diameter of the outer cylinder (52) is greater than the inner diameter of the annular flange (101). The inner cylinder (54) penetrates into the mounting hole (12). One end of the pilot valve (20) penetrates into the outer cylinder (52) and is fixedly connected to the outer cylinder (52). The outer diameter of the pilot valve (20) is greater than the diameter of the mounting hole (12). The annular transition plate (53) limits the axial position of the pilot valve (20). The annular transition plate (53) and the end face of the annular flange (101) are limited and matched. The outer wall of the inner cylinder (54) and the inner wall of the annular flange (101) are fixedly connected.

7. The switching valve according to claim 6, characterized in that: The filter element (80) is a disc-shaped filter screen, the diameter of the filter element (80) is larger than the diameter of the inner cylinder (54), and the filter element (80) is sandwiched between the end wall (21) and the annular transition plate (53).

8. The switching valve according to claim 6, characterized in that: The sleeve (50) further comprises a limiting structure (55), wherein the limiting structure (55) is connected to an end of the inner cylinder (54) away from the annular transition plate (53), the filter element (80) is located in the inner cylinder (54), and the limiting structure (55) limits the position of the filter element (80).

9. The switching valve according to claim 8, characterized in that: The limiting structure (55) is an annular flat plate structure, the filter element (80) is barrel-shaped, and the flat plate structure limits the filter element (80).

10. The switching valve according to claim 8, characterized in that: The limiting structure (55) is a conical shrinkage structure, the filter element (80) is hemispherical, and the shrinkage structure limits the position of the filter element (80).

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