Switching valve

Abstract

The utility model provides a switching valve which comprises a main valve, a pilot valve 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 pilot valve is provided with a pilot valve pipe, one end of the pilot valve pipe is a mounting end, the mounting end is fixedly connected with the annular flange, the mounting end is provided with an end wall, the end wall is provided with a runner hole, and the runner hole is communicated with the runner hole. The flow channel hole is communicated with a cavity in the main valve, and the filtering piece is matched with the end wall and shields the flow channel hole. According to the scheme, connection of the main valve and the guide valve is achieved through connection of the installation end and the annular turned edge, communication of the main valve and the guide valve is achieved through the flow channel hole in the end wall, the filter piece is arranged to shield the flow channel hole, fluid flowing into the flow channel hole can be filtered, impurities are prevented from entering the guide valve, and the service life of the main valve and the guide valve is prolonged. Therefore, impurities are prevented from affecting normal work of the pilot 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 and a filter element. 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 pilot valve has a pilot valve tube, and one end of the pilot valve tube is a mounting end. The mounting end is fixedly connected to the annular flange, and the mounting end has an end wall. The end wall has a flow channel hole, and the flow channel hole is connected to the cavity in the main valve. The filter element cooperates with the end wall and blocks the flow channel hole.

[0006] Furthermore, the mounting end passes through the mounting hole and is welded to the inner wall of the annular flange.

[0007] Furthermore, the filter element is located on a side of the end wall facing the inside of the main valve and is welded to the end wall.

[0008] Alternatively, the filter element is located on a side of the end wall facing the outside of the main valve and is welded to the end wall.

[0009] Furthermore, the outer diameter of the mounting end is larger than the outer diameter of the annular flange, the mounting end has an inwardly turned step facing the inside of the guide valve, the bottom wall of the inwardly turned step forms an end wall, and the annular side wall of the inwardly turned step is welded to the outer wall of the annular flange.

[0010] Furthermore, the filter element is sandwiched between a side of the end wall facing the inside of the main valve and an end surface of the annular flange.

[0011] Furthermore, the filter element is a disc-shaped filter screen.

[0012] Furthermore, the switching valve also includes a limiting member, which is matched with the end surface of the annular flange, and the filter is arranged between the end wall and the limiting member.

[0013] Furthermore, the limiting member is an annular plate, the aperture of the annular plate is smaller than the diameter of the mounting hole, and the hole of the annular plate corresponds to the flow channel hole; the filter element is a disc-shaped filter mesh, and the diameter of the filter element is larger than the aperture of the annular plate.

[0014] Furthermore, the limiting member includes an annular plate and a limiting cylinder. The annular plate is clamped between the end face and the end wall of the annular flange. One end of the limiting cylinder is connected to the inner circumference of the annular plate. The other end of the limiting cylinder has an opening. The filter element is limited in the limiting cylinder. The filter element is a filter net with a groove. The opening of the filter element faces the flow channel hole or the opening of the limiting cylinder.

[0015] Furthermore, a conical necking structure is formed at the opening of the limiting cylinder, the filter element is hemispherical, and the necking structure limits the filter element; or an annular flat plate structure is formed at the opening of the limiting cylinder, the filter element is barrel-shaped, and the flat plate structure limits the filter element.

[0016] The technical solution of the utility model is applied to provide a switching valve, including a main valve, a pilot valve 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 pilot valve has a pilot valve tube, and one end of the pilot valve tube is a mounting end. The mounting end is fixedly connected to the annular flange. The mounting end 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. The filter cooperates with the end wall and blocks the flow channel hole. In this solution, the connection between the main valve and the pilot valve is achieved through the connection between the mounting end and the annular flange, and the connection between the main valve and the pilot valve is achieved 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, and 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

[0017] 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:

[0018] Figure 1 The schematic diagram of the structure of the switching valve provided by the utility model is shown;

[0019] Figure 2 A schematic diagram of the connection area between the main valve and the pilot valve in the switching valve provided in the first embodiment of the utility model is shown;

[0020] Figure 3A schematic diagram of the connection area between the main valve and the pilot valve in the switching valve provided in the second embodiment of the utility model is shown;

[0021] Figure 4 Shows Figure 3 A schematic diagram of a filter element in FIG.

[0022] Figure 5 A schematic diagram of the connection area between the main valve and the pilot valve in the switching valve provided in the third embodiment of the present utility model is shown;

[0023] Figure 6 A schematic diagram showing the connection area between the main valve and the pilot valve in the switching valve provided in the fourth embodiment of the utility model is shown;

[0024] Figure 7 A schematic diagram showing the connection area between the main valve and the pilot valve in the switching valve provided in the fifth embodiment of the present utility model is shown;

[0025] Figure 8 Shows Figure 7 A schematic diagram of a limiting member in FIG.

[0026] Fig. 9 A schematic diagram showing the connection area between the main valve and the pilot valve in the switching valve provided in the sixth embodiment of the present utility model is shown;

[0027] Fig.10 Shows Fig. 9 Schematic diagram of the limiter in FIG.

[0028] The above drawings include the following reference numerals:

[0029] 10. Main valve; 101. Annular flange; 12. Mounting hole;

[0030] 20. pilot valve; 21. end wall; 22. flow channel hole; 23. inverted step;

[0031] 80. Filter element;

[0032] 90. Limiting member; 91. Ring plate; 92. Limiting cylinder. DETAILED DESCRIPTION

[0033] 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.

[0034] like Figures 1 to 10 As shown, an embodiment of the utility model provides a switching valve, including a main valve 10, a pilot valve 20 and a filter element 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 pilot valve 20 has a pilot valve tube, and one end of the pilot valve tube is a mounting end. The mounting end is fixedly connected to the annular flange 101, and the mounting end has an end wall 21. The end wall 21 has a flow channel hole 22, and the flow channel hole 22 is connected to the cavity in the main valve 10. The filter element 80 and the end wall 21 cooperate with and block the flow channel hole 22.

[0035] In this solution, the connection between the main valve 10 and the pilot valve 20 is realized by connecting the mounting end of the pilot valve 20 and the annular flange, and the main valve 10 and the pilot valve 20 are connected by the flow channel hole 22 on the end wall 21. Since the filter 80 is provided to block the flow channel hole 22, 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 end wall 21 is provided to facilitate the assembly of the filter 80.

[0036] 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.

[0037] like Figures 2 to 4 As shown, in some embodiments, the mounting end is inserted into the mounting hole 12 and welded to the inner wall of the annular flange 101. That is, the outer wall of the pilot valve 20 and the inner wall of the annular flange 101 are directly welded to achieve a reliable connection between the two. Specifically, the pilot valve pipe of the pilot valve 20 and the valve pipe of the main valve 10 are both made of stainless steel, which has high strength and is easy to weld.

[0038] like Figure 2 As shown, in one embodiment, the filter element 80 is located on the side of the end wall 21 facing the inside of the main valve 10 and is welded to the end wall 21. That is, a reliable connection between the end wall 21 and the filter element 80 is achieved by welding.

[0039] Or, if Figure 3 As shown, in another embodiment, the filter element 80 is located on the side of the end wall 21 facing the outside of the main valve 10 and is welded to the end wall 21 .

[0040] like Figures 5 to 10 As shown, in some embodiments, the outer diameter of the mounting end is larger than the outer diameter of the annular flange 101, and the mounting end has an inverted step 23 facing the inside of the pilot valve 20, the bottom wall of the inverted step 23 forms the end wall 21, and the annular side wall of the inverted step 23 is welded to the outer wall of the annular flange 101. In this way, the annular flange 101 penetrates into the inverted step 23 and realizes a reliable connection by welding.

[0041] like Figure 5As shown, in one embodiment, the filter element 80 is sandwiched between the side of the end wall 21 facing the inside of the main valve 10 and the end surface of the annular flange 101. In this way, the filter element 80 can be reliably fixed. In this embodiment, the filter element 80 does not need to be welded, or the filter element 80 and the annular flange 101 can also be spot welded.

[0042] like Figure 6 As shown, in one embodiment, when there is an inwardly turned step 23 , the filter element 80 is located on the side of the end wall 21 facing the outside of the main valve 10 and is welded to the end wall 21 .

[0043] In the above embodiment, the filter element 80 can be a disc-shaped filter screen, which has a simple structure and is easy to process.

[0044] like Figures 7 to 10 As shown, in some embodiments, the switching valve further includes a stopper 90, the stopper 90 and the end surface of the annular flange 101 are matched to limit the position, and the filter element 80 is arranged between the end wall 21 and the stopper 90. In this way, the filter element 80 can be limited by the stopper 90 to achieve the fixing of the filter element 80.

[0045] Specifically, Figure 7 and Figure 8 As shown, the stopper 90 is an annular plate 91, the aperture of the annular plate 91 is smaller than the diameter of the mounting hole 12, and the hole of the annular plate 91 corresponds to the flow channel hole 22; the filter element 80 is a disc-shaped filter screen, and the diameter of the filter element 80 is larger than the aperture of the annular plate 91. The filter element 80 is a disc-shaped filter screen, which has a simple structure, is easy to process, and has low cost. Through the above-mentioned size restriction, the annular plate 91 can better support the filter element 80, improve reliability, and prevent the filter element 80 from deforming.

[0046] like Fig. 9 and Fig.10 As shown, in another embodiment, the limiting member 90 includes an annular plate 91 and a limiting cylinder 92, the annular plate 91 is sandwiched between the end surface of the annular flange 101 and the end wall 21, one end of the limiting cylinder 92 is connected to the inner periphery of the annular plate 91, and the other end of the limiting cylinder 92 has an opening, and the filter element 80 is limited in the limiting cylinder 92, and the filter element 80 is a filter screen with a groove, and the opening of the filter element 80 faces the flow channel hole 22. In this way, the filter element 80 is limited by the limiting cylinder 92. The filter element 80 adopts a filter screen with a groove, and the filtering area is large.

[0047] Alternatively, in some embodiments, the opening of the filter element 80 faces the opening of the limiting cylinder 92 .

[0048] Specifically, a conical constriction structure is formed at the opening of the limiting cylinder 92, the filter element 80 is hemispherical, and the constriction structure limits the filter element 80. Alternatively, an annular flat plate structure is formed at the opening of the limiting cylinder 92, the filter element 80 is barrel-shaped, and the flat plate structure limits the filter element 80. The filter element 80 can be reliably limited by the constriction structure or the flat plate structure.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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) and a filter element (80), wherein 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), the pilot valve (20) has a pilot valve tube, one end of the pilot valve tube is a mounting end, the mounting end and the annular flange (101) are fixedly connected, the mounting end has 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), and 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 mounting end passes through the mounting hole (12) and is welded to the inner wall of the annular flange (101).

3. The switching valve according to claim 1, characterized in that: The filter element (80) is located on a side of the end wall (21) facing the inside of the main valve (10) and is welded to the end wall (21); or, the filter element (80) is located on a side of the end wall (21) facing the outside of the main valve (10) and is welded to the end wall (21).

4. The switching valve according to claim 1, characterized in that: The outer diameter of the mounting end is greater than the outer diameter of the annular flange (101), and the mounting end has an inwardly turned step (23) facing the inside of the pilot valve (20), the bottom wall of the inwardly turned step (23) forms the end wall (21), and the annular side wall of the inwardly turned step (23) and the outer wall of the annular flange (101) are welded.

5. The switching valve according to claim 4, characterized in that: The filter element (80) is sandwiched between a side of the end wall (21) facing the inside of the main valve (10) and an end surface of the annular flange (101).

6. The switching valve according to any one of claims 1 to 5, characterized in that: The filter element (80) is a disc-shaped filter screen.

7. The switching valve according to claim 4, characterized in that: The switching valve further comprises a limiting member (90), the limiting member (90) and the end surface of the annular flange (101) are in limiting cooperation, and the filter element (80) is arranged between the end wall (21) and the limiting member (90).

8. The switching valve according to claim 7, characterized in that: The limiting member (90) is an annular plate (91), the aperture of the annular plate (91) is smaller than the diameter of the mounting hole (12), and the hole of the annular plate (91) corresponds to the flow channel hole (22); the filter element (80) is a disc-shaped filter screen, and the diameter of the filter element (80) is larger than the aperture of the annular plate (91).

9. The switching valve according to claim 7, characterized in that: The limiting member (90) comprises an annular plate (91) and a limiting cylinder (92); the annular plate (91) is clamped between the end surface of the annular flange (101) and the end wall (21); one end of the limiting cylinder (92) is connected to the inner periphery of the annular plate (91); the other end of the limiting cylinder (92) has an opening; the filter member (80) is limited in the limiting cylinder (92); the filter member (80) is a filter net with a groove; the opening of the filter member (80) faces the flow channel hole (22) or the opening of the limiting cylinder (92).

10. The switching valve according to claim 9, characterized in that: A conical shrinkage structure is formed at the opening of the limiting cylinder (92); the filter element (80) is hemispherical, and the shrinkage structure limits the position of the filter element (80); Or an annular flat plate structure is formed at the opening of the limiting cylinder (92), the filter element (80) is in a cylindrical shape, and the flat plate structure limits the filter element (80).

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