CN219139971U - Pilot valve fixing device and switching valve - Google Patents

Abstract

The utility model relates to a pilot valve fixing device and switching valve, the pilot valve fixing device is used for fixing the pilot valve, the pilot valve fixing device comprises a bracket and a supporting cover, the bracket is used for bearing the pilot valve, the supporting cover is provided with a first connecting plate and a second connecting plate, and under the driving of the supporting cover, the first connecting plate and the second connecting plate can be clamped to the bracket along a first direction and fix the pilot valve; wherein, be equipped with spacing portion on the second connecting plate, be equipped with spacing mating portion on the support, through the cooperation between spacing portion and the spacing mating portion to make the movement of relative support to spacing with the supporting cover along first direction. The utility model has the advantages that: the deformation of the support cover in the installation process is limited, elastic failure of the support cover caused by overlarge deformation in the assembly process is avoided, the pilot valve is loosened, the pilot valve is fastened better, and the performance of the switching valve is improved.

Description

Pilot valve fixing device and switching valve

Technical Field

The application relates to the technical field of valve correlation, in particular to a pilot valve fixing device and a switching valve.

Background

The pilot valve fixing device is commonly used in a switching valve and plays a role in fixing the pilot valve. The pilot valve is typically mounted to the switching valve using a mating structure of a support and a bracket, specifically, the bracket is fixedly mounted to the switching valve body for carrying the pilot valve, and the support is detachably mounted to the bracket for limiting the pilot valve to the bracket. At present, the support cover is arranged on the support in a mode that a clamping groove on the support is buckled with a buckling lug on the support between the existing support and the support cover so as to limit the pilot valve. However, the traditional support cover is in the form of a spring plate, the upper and lower directions of the pilot valve are required to be restrained by the elastic force of the support cover plate, manual operation is required during installation, the deformation of the support cover exceeds the deformation of the yield limit of the support cover per se due to excessive force during operation, the elastic force of the support cover is invalid, the restraining reliability of the pilot valve is low, and the pilot valve is easy to loosen.

Disclosure of Invention

Accordingly, it is necessary to provide a pilot valve fixing device and a switching valve which can restrict the elastic deformation amount of the support cover at the time of installation, improve the reliability of the fastening of the pilot valve, and are suitable for automatic press fitting.

In order to solve the technical problems, the application provides the following technical scheme:

a pilot valve fixing device for fixing a pilot valve, the pilot valve fixing device comprising:

the bracket is used for bearing the pilot valve;

the support cover is provided with a first connecting plate and a second connecting plate, and under the drive of the support cover, the first connecting plate and the second connecting plate can be clamped to the support and fix the pilot valve; the second connecting plate is provided with a limiting part, the support is correspondingly provided with a limiting matching part, and the relative movement between the support and the support is limited through the matching between the limiting part and the limiting matching part.

It can be understood that such setting for the supporting cover is fastened on the pilot valve through first connecting plate and second connecting plate, simultaneously through setting up spacing portion and spacing cooperation portion in order to restrict the motion of supporting cover along first direction, thereby restrict the deflection of supporting cover, avoid the elastic deformation of supporting cover too big and lead to supporting cover elastic failure in the assembly process, thereby make pilot valve fixing device more reliable to the constraint of pilot valve, the pilot valve is difficult for not hard up.

In one embodiment, the second connecting plate is provided with a limiting hole, the bottom of the limiting hole is formed into the limiting part, the limiting matching part is a limiting convex plate arranged on the bracket, and the limiting convex plate is matched with the limiting hole;

or, the limiting part is arranged as a limiting and resisting plate on the second connecting plate, and the bracket is provided with a limiting groove, the bottom of the limiting groove is formed into the limiting matching part, and the limiting groove is matched with the limiting and resisting plate.

It can be understood that the displacement of the support cover in the first direction is limited by specifically setting the limit fit between the limit part and the limit fit part, so as to control the deformation amount of the support cover.

In one embodiment, the limiting convex plate is connected with a connecting matching plate, and the second connecting plate is provided with a bending part, and the connecting matching plate is attached to the second connecting plate and is abutted against the bending part so as to limit the second connecting plate to be separated from the limiting matching part;

or, the spacing board of keeping out is connected with and connects the cooperation board, be equipped with hook plate portion on the support, hook plate portion can collude connect the cooperation board, in order to restrict the second connecting plate breaks away from spacing cooperation portion.

It is understood that the second connecting plate and the limit matching part are limited to be separated from each other by arranging the bending part on the second connecting plate to be matched with the connection matching plate connected with the limit convex plate on the bracket or arranging the hook plate part on the bracket to be matched with the connection matching plate connected with the limit resisting plate on the second connecting plate.

In one embodiment, the connecting and matching plate is provided with a limiting groove, and the bending part bends towards the direction of the limiting groove and is clamped into the limiting groove.

It can be understood that the arrangement is such that the bending part is convenient to bend along the position of the limit groove, thereby realizing the connection positioning between the second connecting plate and the connection matching plate.

In one embodiment, the bending portion is engaged against the connection to restrict movement of the support cover in a direction perpendicular to the connection engagement plate.

It will be appreciated that the arrangement is such that the abutment is constrained in a direction perpendicular to the direction of attachment of the mating plates, thereby providing greater stability of attachment of the abutment to the bracket after assembly.

In one embodiment, the first connecting plate is provided with a clamping groove, and the bracket is correspondingly provided with a lug matched with the clamping groove, so that the first connecting plate is clamped to the bracket through the cooperation between the lug and the clamping groove;

or, the first connecting plate is provided with a buckling lug, the bracket is correspondingly provided with a buckling groove matched with the buckling lug, and the first connecting plate is connected to the bracket in a clamping way through the matching between the buckling lug and the buckling groove.

It can be understood that, so set up, be convenient for pass through the lock location between supporting lid and the support for the supporting lid also can restrict the supporting lid deflection in the one side that first connecting plate was located, avoids supporting lid elastic deformation to surpass the yield limit and leads to supporting lid elastic failure.

In one embodiment, a bending convex plate is arranged on the outer side of the clamping groove and used for guiding the lug to be clamped into the clamping groove when the supporting cover is clamped to the bracket.

It will be appreciated that this arrangement facilitates guiding the first connector plate to the bracket and restricts the assembled first connector plate from being removed from the bracket.

In one embodiment, the bending part is perpendicular to the connecting fitting plate.

It is understood that the arrangement is such that the limit degree of the support cover is optimal by the mutual cooperation between the bending part and the connecting matching plate.

In one embodiment, when the clamping groove is disposed on the first connecting plate, the length of the first connecting plate is smaller than the length of the second connecting plate.

It is to be appreciated that the arrangement is such that the first connection plate of the support cap is first positioned and connected to the bracket during assembly, so that the assembly is convenient.

The application also provides the following technical scheme:

a switching valve comprising a switching valve body, a pilot valve and a pilot valve fixing device, the pilot valve being fixed to the switching valve body by the pilot valve fixing device; the pilot valve fixing device is arranged as the pilot valve fixing device.

Compared with the prior art, the pilot valve fixing device and the switching valve provided by the application have the advantages that the first connecting plate and the bracket are buckled in sequence, the second connecting plate and the bracket are in limit and fixed mutual fit, and the displacement of the support cover along the first direction is limited after the assembly is completed; meanwhile, as the deformation of the support cover is limited due to the cooperation of the limiting part and the limiting cooperation part, the elastic failure of the support cover caused by overlarge deformation of the support cover in the assembling process is avoided, the pilot valve is loosened, and the performance of the switching valve is improved. The pilot valve fixing device structure is suitable for automatic press fitting, solves the problem that an existing structure can only be manually operated, and improves production efficiency of products.

Drawings

In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings that are required to be used in the description of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.

Fig. 1 is a schematic diagram of an assembly structure of a pilot valve fixing device and a pilot valve provided in the present application.

Fig. 2 is a perspective view of a support provided herein.

Fig. 3 is a schematic structural diagram of a first view angle of the support cover provided in the present application.

Fig. 4 is a schematic structural diagram of a second view angle of the support cover provided in the present application.

Fig. 5 is a schematic structural diagram of a third view angle of the support cover provided in the present application.

Fig. 6 is a perspective view of a stent provided herein.

Fig. 7 is a schematic structural diagram of a first view of the bracket provided in the present application.

Fig. 8 is a schematic structural view of a second view of the bracket provided in the present application.

Fig. 9 is a schematic structural view of a third view of the bracket provided in the present application.

Reference numerals: 100. a pilot valve fixing device; 10. a supporting cover; 11. a cover plate; 12. a first connection plate; 121. a clamping groove; 122. bending the convex plate; 13. a second connecting plate; 131. a limit part; 132. a limiting hole; 1321. a hole bottom; 133. a bending part; 134. a straight portion; 135. an extension; 20. a bracket; 21. a bottom plate; 22. a support plate; 221. positioning bayonets; 23. a lug; 231. lug recesses; 232. a lug boss; 24. a limit matching part; 241. a limiting convex plate; 25. connecting the matched plates; 251. a limit groove; 200. and (5) pilot valve.

Detailed Description

In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is, however, susceptible of embodiment in many other forms than those described herein and similar modifications can be made by those skilled in the art without departing from the spirit of the application, and therefore the application is not to be limited to the specific embodiments disclosed below.

It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used in the description of the present application for purposes of illustration only and do not represent the only embodiment.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless explicitly defined otherwise.

In this application, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be a direct contact of the first feature with the second feature, or an indirect contact of the first feature with the second feature via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely under the second feature, or simply indicating that the first feature is less level than the second feature.

Unless defined otherwise, all technical and scientific terms used in the specification of 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 the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. The term "and/or" as used in the specification of this application includes any and all combinations of one or more of the associated listed items.

The switching valve provided in an embodiment of the present application includes a switching valve main body (not shown), a pilot valve 200 and a pilot valve fixing device 100, wherein the pilot valve 200 is fixed to the switching valve main body by the pilot valve fixing device 100.

Referring to fig. 1, an embodiment of a pilot valve fixing device 100 is provided for fixing a pilot valve 200, where the pilot valve fixing device 100 includes a bracket 20 and a support cover 10, the bracket 20 is used for carrying the pilot valve 200, the support cover 10 has a first connecting plate 12 and a second connecting plate 13, and the first connecting plate 12 and the second connecting plate 13 can be clamped to the bracket 20 along a first direction (such as an X direction in fig. 1) under the driving of the support cover 10, and the pilot valve 200 is fixed; wherein, be equipped with spacing portion 131 on the second connecting plate 13, be equipped with spacing mating portion 24 on the support 20, through the cooperation between spacing portion 131 and the spacing mating portion 24, with the movement of branch lid 10 along first direction relative support 20 carries out spacingly, make branch lid 10 be fastened on pilot valve 200 through first connecting plate 12 and second connecting plate 13, restrict the movement of branch lid 10 along first direction through setting up spacing portion 131 and spacing mating portion 24, thereby restrict the deformation volume of branch lid 10, avoid the deformation volume of branch lid 10 too big and lead to branch lid 10 elasticity inefficacy in the assembly process, thereby make pilot valve fixing device 100 to pilot valve 200's constraint more reliable, pilot valve 200 is difficult for becoming flexible.

As shown in fig. 2 to 5, the support cover 10 includes a cover plate 11, a first connection plate 12 and a second connection plate 13, the plurality of first connection plates 12 and the plurality of second connection plates 13 are oppositely disposed at both sides of the cover plate 11, and the support cover 10 is fixedly connected to the bracket 20 through the first connection plate 12 and the second connection plate 13 being mutually matched.

Wherein, the length of the first connecting plate 12 is shorter than that of the second connecting plate 13, so that the support cover 10 is positioned and connected to the bracket 20 through the first connecting plate 12, and the assembly is convenient.

In an embodiment, the first connecting plate 12 is provided with a clamping groove 121, the bracket 20 is provided with a lug 23 matched with the clamping groove 121, the outer side of the clamping groove 121 is provided with a bending convex plate 122, and the bending convex plate 122 is positioned at the tail end of the first connecting plate 12. The first connecting plate 12 plays a guiding role through the matching of the clamping groove 121 and the bending convex plate 122, the assembly between the first connecting plate 12 and the support 20 is guided, and the assembled first connecting plate 12 is limited to be separated from the support 20 through the bending convex plate 122, so that the matching between the support cover 10 and the support 20 is tighter, and the connection stability between the support cover 10 and the support 20 is improved.

In an embodiment, the second connecting plate 13 is provided with a limiting hole 132, the limiting hole 132 is located at the end of the second connecting plate 13 and is in a substantially open elongated hole structure, a hole bottom 1321 of the limiting hole is formed into a limiting portion 131, the limiting matching portion 24 is provided as a limiting convex plate 241 provided on the bracket 20, the shape of the limiting hole 132 is matched with the shape of the limiting convex plate 241, and the length direction extends along the first direction. The opening of the limiting hole 132 is downward, so that the second connecting plate 13 can be clamped onto the limiting convex plate 241 through the opening of the limiting hole 132. When the hole bottom 1321 of the limiting hole 132 abuts against the upper end of the limiting boss 241, the movement of the cover 10 relative to the bracket 20 in the first direction is limited, so that the cover 10 is limited from continuing to be deformed by pressing down, that is, the limiting portion 131 is set as the hole bottom 1321 of the limiting hole 132.

Further, the second connecting plate 13 further includes an extension portion 135 and a straight portion 134, and the limiting hole 132 is located between the extension portion 135 and the straight portion 134, and the extension portion 135 of the second connecting plate 13 protrudes and bends in the first direction relative to the connecting mating plate 25 to form a bending portion 133. Fig. 2 to 5 show the form of the cover 10 before the bent portion 133 is formed. It should be noted that, when the bending portion 133 is not formed, the extending portion 135 of the second connecting plate 13 is generally flat, so as to facilitate the assembly between the second connecting plate 13 and the connecting mating plate 25.

As shown in fig. 6 to 9, the bracket 20 includes a bottom plate 21 for fixing the pilot valve fixing device 100 to the switching valve body, a support plate 22, lugs 23, a limit fitting portion 24, and a connection fitting plate 25, the two support plates 22 being erected opposite to both sides of the bottom plate 21 to support the pilot valve 200. The support plate 22 is provided with a positioning bayonet 221, and one end of the pilot valve 200 is placed on the positioning bayonet 221 during installation, so that a part of the pilot valve 200 is abutted against the edge of the positioning bayonet 221, and the pilot valve 200 is limited to move leftwards and rightwards in the radial direction. The lugs 23 and the limit matching parts 24 are respectively arranged at two side edges of the support plate 22 and matched with the first connecting plate 12 and the second connecting plate 13 which are correspondingly arranged. The position of the lug 23 is higher than that of the limit fitting portion 24, and the length of the corresponding fitting first connecting plate 12 is shorter than that of the second connecting plate 13, so that the fitting and positioning between the first connecting plate 12 and the lug 23, and between the second connecting plate 13 and the limit fitting portion 24 are facilitated.

In an embodiment, the clamping groove 121 on the first connecting plate 12 is buckled with the lug 23 on the bracket 20, and specifically, the lug 23 includes a lug concave portion 231 and a lug convex portion 232. During assembly, the clamping grooves 121 on the two first connecting plates 12 simultaneously pass through the lug protruding parts 232, then the edges of the clamping grooves 121 are abutted against the lug recessed parts 231, and meanwhile, the bending protruding plates 122 are also clamped into the lug recessed parts 231, so that the first connecting plates 12 are limited to be separated from the lugs 23. At this time, the upper edge of the protruding lug 232 is higher than the upper edge of the bayonet of the slot 121, so as to limit the movement of the mounted cap 10 in the second direction (e.g., Y direction in fig. 1). In this way, the deformation amount of the support cover 10 on the first connecting plate 12 side is limited, and elastic failure of the support cover 10 due to the elastic deformation amount of the support cover 10 on the first connecting plate 12 side exceeding the deformation amount of the yield limit is avoided.

In another embodiment, the first connecting plate 12 is provided with a fastening lug (not shown), the bracket 20 is provided with a fastening slot matching the fastening lug, the outer side of the fastening slot is provided with a guide plate, the fastening lug can pass through the fastening slot and is fastened with the fastening slot, so that the first connecting plate 12 can be connected to the bracket 20, and the guide plate can limit the fastening lug after being assembled to be separated from the fastening slot, so that the first connecting plate 12 and the bracket 20 are stably connected.

In the process of assembling and positioning the first connecting plate 12 and the bracket 20, the second connecting plate 13 is in limit fit with the limit fit portion 24 through the limit portion 131.

As shown in fig. 1, in an embodiment, the limiting portion 131 is configured as a hole bottom 1321 of the limiting hole 132, and the limiting mating portion 24 is correspondingly configured as a limiting protruding plate 241, where the limiting protruding plate 241 is formed by extending the support plate 22 outward along a side edge portion, and is located between the connecting mating plate 25 and the support plate 22. The outer contour of the limiting convex plate 241 is matched with the edge shape of the limiting hole 132, and is approximately in a strip elliptical hole shape, so that the limiting convex plate 241 can pass through the limiting hole 132 on the second connecting plate 13 and is abutted with the hole bottom 1321 of the limiting hole 132, and the edge of the limiting convex plate 241 is tightly attached to the edge of the limiting hole 132, so that the second connecting plate 13 is tightly matched with the bracket 20.

It should be noted that, the limiting portion 131 and the limiting matching portion 24 are not limited to those illustrated in the drawings, and for those skilled in the art, the limiting portion 131 may be set as a limiting abutment plate (not illustrated) on the second connecting plate 13, a limiting groove (not illustrated) is formed on the bracket 20, the limiting matching portion 24 is set as a groove bottom of the limiting groove, and an opening of the limiting groove is upward, so that the limiting abutment plate on the first connecting plate 12 is driven to abut against the groove bottom of the limiting groove along the first direction when the support cover 10 is assembled, and the support cover 10 cannot be continuously pressed at this time, thereby limiting the deformation amount of the support cover 10. In one embodiment, the connecting fitting plate 25 is substantially in a flange shape, is connected to the limiting convex plate 241, is vertically disposed at the edge position of the support plate 22, and is turned outwards by 90 °. During assembly, the second connecting plate 13 can abut against the connecting matching plate 25 to limit the movement of the support cover 10 along the direction perpendicular to the connecting matching plate 25, that is, the movement of the support cover 10 along the second direction is limited by matching with the first connecting plate 12, so that the displacement of the support cover 10 in the second direction is limited. Preferably, the bending part 133 is vertically arranged with the connecting matching plate 25, that is, the extending part 135 in the second connecting plate 13 extends out along the first direction and bends outwards by 90 ° to form the bending part 133, and at this time, the bending part 133 and the connecting matching plate 25 cooperate with each other to optimize the limit degree of the supporting cover 10. Of course, in other embodiments, the angle between the bending portion 133 and the connecting mating plate 25 may be set to other values such as 80 ° and 100 °, so long as the second connecting plate 13 can be restricted from being separated from the connecting mating plate 25, thereby restricting the separation of the limiting protruding plate 241 from the hole bottom 1321 of the limiting hole 132.

Further, a limiting groove 251 is formed below the connecting mating board 25, so that the second connecting board 13 is bent along the position of the limiting groove 251 when forming the bending portion 133, so as to facilitate the forming of the bending portion 133. The bent portion 133 is pressed into the limit groove 251 to fix the state, and at this time, the displacement of the cover 10 in the first direction is limited. Of course, in other embodiments, the connecting and matching plate 25 may be turned by 90 ° toward the inner side of the bracket 20, and the bent portion 133 of the second connecting plate 13 is located on the inner side of the support cover 10, and the flat portion 134 is located on the outer side of the support cover 10.

It should be noted that, when the limiting portion 131 is set as the limiting abutment plate on the second connecting plate 13, and the limiting matching portion 24 is set as the bottom of the limiting groove, the connecting matching plate 25 is correspondingly set to be connected with the limiting abutment plate on the second connecting plate 13, and the hook plate portion is set on the bracket 20 to be hooked with the connecting matching plate 25 on the supporting cover 10, so as to limit the limiting abutment plate from leaving the bottom of the limiting groove. At this time, the limit groove 251 is opened at a position where the connection mating plate 25 is hooked with the hook plate portion.

In addition, in other embodiments, the first connection plate 12 or the second connection plate 13 and the bracket 20 may be fixed by welding, bolting, or the like.

In summary, according to the pilot valve fixing device 100 and the switching valve of the present application, the first connecting plate 12 and the bracket 20 are clamped in sequence, and the limiting portion 131 and the limiting matching portion 24 of the second connecting plate 13 are in limiting matching, so that the pilot valve 200 is fastened by the support cover 10, and meanwhile, the deformation of the support cover 10 in the installation process is limited, so that the loosening of the pilot valve 200 caused by elastic failure of the support cover 10 is avoided. The structure of this application is applicable to automatic pressure equipment moreover, solves the problem that current structure can only manual operation, has improved the production efficiency of product. The pilot valve fixing device 100 specifically realizes the fixed installation of the pilot valve fixing device 100 in the switching valve by fixing the bottom plate 21 to the outer wall of the switching valve body, then installing the pilot valve 200 to the positioning bayonet 221 of the bracket 20, and finally assembling the support cover 10 to the bracket 20, thereby improving the overall stability of the switching valve.

The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of the present application is to be determined by the following claims.

Claims (10)

1. A pilot valve fixing device for fixing a pilot valve (200), the pilot valve fixing device comprising:

-a support (20), the support (20) being adapted to carry the pilot valve (200);

a support cover (10), wherein the support cover (10) is provided with a first connecting plate (12) and a second connecting plate (13), and the first connecting plate (12) and the second connecting plate (13) can be clamped to the bracket (20) and fix the pilot valve (200) under the driving of the support cover (10);

the second connecting plate (13) is provided with a limiting part (131), the support (20) is correspondingly provided with a limiting matching part (24), and the relative movement between the support cover (10) and the support (20) is limited through the matching between the limiting part (131) and the limiting matching part (24).

2. Pilot valve fixing device according to claim 1, characterized in that a limiting hole (132) is formed in the second connecting plate (13), a hole bottom (1321) of the limiting hole (132) is formed as the limiting part (131), the limiting matching part (24) is arranged as a limiting convex plate (241) arranged on the bracket (20), and the limiting convex plate (241) is matched with the limiting hole (132);

or, the limiting part (131) is arranged as a limiting and resisting plate on the second connecting plate (13), and the bracket (20) is provided with a limiting groove, the bottom of the limiting groove is formed as a limiting matching part, and the limiting groove is matched with the limiting and resisting plate.

3. Pilot valve fixing device according to claim 2, characterized in that the limiting protruding plate (241) is connected with a connecting fitting plate (25), the second connecting plate (13) is formed with a bending part (133), the connecting fitting plate (25) is attached to the second connecting plate (13) and abuts against the bending part (133) to limit the second connecting plate (13) from being separated from the limiting fitting part (24);

or, the limit bearing plate is connected with a connection matching plate (25), a hook plate part is arranged on the bracket (20), and the hook plate part can hook the connection matching plate (25) so as to limit the second connecting plate (13) to be separated from the limit matching part (24).

4. A pilot valve fixing device according to claim 3, wherein the connecting fitting plate (25) is provided with a limit groove (251), and the bending part (133) is bent towards the direction of the limit groove (251) and is clamped into the limit groove (251).

5. Pilot valve fixing device according to claim 4, characterized in that the bending part (133) abuts against the connecting fitting plate (25) to limit the movement of the branch cover (10) in a direction perpendicular to the connecting fitting plate (25).

6. Pilot valve fixing device according to claim 1, characterized in that the first connection plate (12) is provided with a clamping groove (121), the bracket (20) is correspondingly provided with a lug (23) matched with the clamping groove (121), and the first connection plate (12) is clamped to the bracket (20) through the cooperation between the lug (23) and the clamping groove (121);

or, the first connecting plate (12) is provided with a buckling lug, the bracket is correspondingly provided with a buckling groove matched with the buckling lug, and the first connecting plate (12) is clamped to the bracket (20) through the matching between the buckling lug and the buckling groove.

7. Pilot valve fixing device according to claim 6, characterized in that the outside of the clamping groove (121) is provided with a bent boss (122), which bent boss (122) is used for guiding the lug (23) to be clamped into the clamping groove (121) when the branch cover (10) is clamped to the bracket (20).

8. A pilot valve fixing device according to claim 3, characterized in that the bending portion (133) is arranged perpendicular to the connecting mating plate (25).

9. Pilot valve fixing device according to claim 6, characterized in that the length of the first connection plate (12) is smaller than the length of the second connection plate (13) when the clamping groove (121) is arranged on the first connection plate (12).

10. A switching valve comprising a switching valve body, a pilot valve (200) and a pilot valve fixing means by which the pilot valve (200) is fixed to the switching valve body; -characterized in that the pilot valve fixture is provided as a pilot valve fixture (100) according to any one of claims 1-9.

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