CN218625623U - Self-closing valve - Google Patents

Abstract

The application provides a self-closing valve, which comprises a valve body, a checking cap, a resetting cap and a limiting assembly; the valve body is provided with an air cavity, the valve body is provided with an air inlet, an air outlet and a first mounting port which are communicated with the air cavity, the air inlet and the air outlet are used for connecting a pipeline, the resetting cap is arranged outside the first mounting port, and the inspection cap is arranged between the valve body and the resetting cap; the limiting assembly comprises a pressing plate and an elastic piece, a mounting column is arranged on the valve body, a first mounting port is located on the mounting column and is far away from the end face of the valve body, the pressing plate is connected to one end, far away from the valve body, of the mounting column, the inspection cap is sleeved outside the mounting column, and the elastic piece is abutted between the pressing plate and the inspection cap. The application provides a self-closing valve, its inspection cap can the butt on the valve body all the time, prevents to appear the clearance between valve body and the inspection cap to avoid the foreign matter to get into inside the valve body.

Description

Self-closing valve

Technical Field

The application relates to the technical field of valves, in particular to a self-closing valve.

Background

The gas self-closing valve for pipeline is installed on the pipeline of low-pressure gas system, and when the gas supply pressure of pipeline is under-pressure or over-pressure, it has no need of using electricity or other external power, and can be automatically closed and manually opened.

In the related technology, the self-closing valve comprises a valve body and a valve cap, wherein an air cavity is arranged in the valve body, an air inlet, an air outlet and a plurality of mounting ports communicated with the air cavity are formed in the valve body, the air inlet and the air outlet are respectively installed in a gas pipeline, the valve cap is arranged at the mounting port of the valve body, and the valve cap can move up and down according to the pressure of the pipeline so as to realize the automatic valve closing.

However, when the self-closing valve is installed in an inverted or inclined mode, the valve cap has insufficient resetting capacity, a gap exists between the valve cap and the valve body, foreign matters easily enter the installation opening from the gap between the valve cap and the valve body and then enter the valve body through the installation opening, and the valve body is damaged.

SUMMERY OF THE UTILITY MODEL

The application provides a self-closing valve, which is used for solving the problem that the self-closing valve is easy to enter foreign matters and damage a valve body.

The application provides a self-closing valve, which comprises a valve body, a checking cap, a resetting cap and a limiting assembly;

the valve body comprises a first cover body and a second cover body, the first cover body and the second cover body are jointly arranged to form an air cavity in an enclosing mode, the second cover body is provided with an air inlet and an air outlet which are communicated with the air cavity, and the air inlet and the air outlet are both used for being connected with a pipeline; the first cover body is provided with a first mounting opening, the reset cap is arranged outside the first mounting opening, and the inspection cap is arranged between the valve body and the reset cap;

the limiting assembly comprises a pressing plate and an elastic piece, a mounting column is arranged on the valve body, a first mounting port is located on the mounting column and is far away from the end face of the valve body, the pressing plate is connected to one end, far away from the valve body, of the mounting column, the inspection cap is sleeved outside the mounting column, and the elastic piece is abutted between the pressing plate and the inspection cap.

According to the self-closing valve, the reset cap is arranged outside the first mounting port of the valve body, so that the reset cap can be conveniently turned to reset after the self-closing valve is automatically closed; the inspection cap is arranged between the valve body and the reset cap, so that a user can determine the opening and closing state of the self-closing valve through the position relation between the reset cap and the inspection cap; through setting up spacing subassembly, reduce the clearance between inspection cap and the valve body, avoid the foreign matter to get into the valve body from the clearance inside to cause the harm to the valve body. The limiting assembly comprises a pressing plate and an elastic part, the valve body is provided with a mounting column, a first mounting hole is formed in the end face, far away from the valve body, of the mounting column, the pressing plate is connected to one end, far away from the valve body, of the mounting column, the inspection cap is sleeved outside the mounting column, the elastic part abuts against the portion, between the pressing plate and the inspection cap, of the elastic part, when the inspection cap needs to be reset, pressure is applied by hands, the elastic part is compressed, the inspection cap can be lifted, and therefore the reset cap is driven to reset; under the natural state, the elastic component keeps the original state, and the inspection cap can butt on the valve body all the time, prevents to appear the clearance between valve body and the inspection cap to avoid the foreign matter to get into inside the valve body from the one end that the inspection cap is close to the valve body.

In a possible implementation mode, the limiting assembly further comprises a fixing piece, the mounting column is provided with a large-diameter section and a small-diameter section, one end of the large-diameter section is connected with the valve body, the other end of the large-diameter section is connected with the small-diameter section, one end of the large-diameter section, which is connected with the small-diameter section, is provided with a step surface, the small-diameter section is provided with the fixing piece, and the pressing plate is installed between the step surface and the fixing piece.

In one possible implementation manner, the fixing piece is a clamp spring, the small-diameter section is provided with an annular clamping groove, the clamp spring is clamped in the annular clamping groove, and the pressing plate is installed between the step surface and the clamp spring.

In a possible implementation mode, one end of the inspection cap, which is close to the valve body, is provided with a butting wall, one side surface of the butting wall, which deviates from the valve body, extends out of a limiting column, the pressing plate is provided with a limiting hole, and the limiting column is inserted into the limiting hole.

In one possible implementation manner, the elastic member is a spring, and the spring is sleeved outside the limiting column.

In a possible implementation manner, the elastic piece is a conical spring, and the aperture of the small-diameter end of the conical spring is matched with the outer diameter of the limiting column.

In one possible implementation, the mounting post has a limiting tangent plane, the abutment wall has a mounting hole, and the mounting hole has a fitting surface corresponding to the limiting tangent plane.

In a possible implementation manner, the reset cap comprises a top wall and a side wall, wherein the side wall is connected to one side surface of the top wall facing the valve body, and the top wall extends out of the side wall along the radial direction of the top wall to form a cap edge; the inspection cap is sleeved outside the side wall.

In a possible implementation mode, the air-conditioning valve further comprises a diaphragm and a valve rod, the diaphragm is arranged in the air cavity, the valve rod is movably arranged in the first mounting hole in a penetrating mode, one end of the valve rod is connected with the diaphragm, and the other end of the valve rod is connected with the reset cap;

the valve rod can movably penetrate through the part of the first mounting opening to form a connecting section, the cross section of the connecting section is matched with the shape of the first mounting opening, and the size of the valve rod is matched with that of the first mounting opening.

In a possible implementation mode, the valve further comprises a circuit board, the valve body is provided with a second mounting opening matched with the circuit board, the circuit board is mounted in the second mounting opening, and the reset cap is arranged outside the second mounting opening.

The construction of the present application and other objects and advantages thereof will be more apparent from the following description of the preferred embodiments taken in conjunction with the accompanying drawings.

Drawings

The foregoing and other objects, features and advantages of embodiments of the present application will be more readily understood from the following detailed description taken in conjunction with the accompanying drawings. Embodiments of the present application will be described by way of example and not limitation in the accompanying drawings, in which:

FIG. 1 is an exploded view of a self-closing valve provided in accordance with an embodiment of the present application;

FIG. 2 is a cross-sectional view of a self-closing valve provided in accordance with an embodiment of the present application;

FIG. 3 is a schematic view of the first cover in FIG. 1;

FIG. 4 is a schematic view of the inspection cap of FIG. 1;

FIG. 5 is a schematic view of the platen of FIG. 1;

fig. 6 is a schematic view of the elastic member of fig. 1.

Reference numerals:

100-a valve body; 101-a first cover; 102-a second cover; 110-air cavity; 121-an air inlet; 122-gas outlet; 123-a first mounting port; 124-a second mounting port; 130-mounting posts; 131-a large-diameter section; 1311-step face; 132-a small diameter section; 1321-ring card slot; 133-limiting section; 134-avoiding the notch;

200-a spacing assembly; 210-a platen; 211-a limiting hole; 220-an elastic member; 221-small diameter end; 230-a fixing member;

300-a test cap; 310-an abutment wall; 320-a limiting column; 330-mounting holes; 331-a mating face; 340-an inner recess;

400-a reduction cap; 410-a top wall; 411-brim of a hat; 420-a side wall;

500-a membrane;

600-a valve stem;

700-intelligent control;

800-a magnetic component;

900-an auxiliary valve body; 910-handle.

Detailed Description

Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.

The gas self-closing valve for pipeline is installed on the pipeline of low-pressure gas system, and when the gas supply pressure of pipeline is under-pressure or over-pressure, it has no need of using electricity or other external power, and can be automatically closed and manually opened.

In the related technology, the self-closing valve comprises a valve body and a valve cap, wherein an air cavity is arranged in the valve body, an air inlet, an air outlet and a plurality of mounting ports are formed in the valve body and communicated with the air cavity, the air inlet and the air outlet are respectively installed in a gas pipeline, clamping jaws and other parts are installed on the mounting ports, and the valve cap is arranged at the mounting port of the valve body. Wherein, the valve cap includes reset cap and inspection cap, and the inspection cap setting is between reset cap and valve body, and reset cap can reciprocate according to pipeline pressure to realize automatic closing valve, inspection cap freely removes between reset cap and valve body.

However, in the self-closing valve, the distance between the reset cap and the valve body is larger than the height of the inspection cap, when the self-closing valve is in an inverted state or a side-placed state, a gap is formed between the inspection cap and the valve body, foreign matters easily enter the installation opening from the gap between the inspection cap and the valve body and then enter the valve body through the installation opening, and damage is caused to structures such as a membrane in the valve body.

In view of this, this application embodiment provides a self-closing valve, this self-closing valve includes the valve body, the inspection cap, reset cap and spacing subassembly, wherein, spacing subassembly includes clamp plate and elastic component, be equipped with the erection column on the valve body, first installing port is located the terminal surface that the valve body was kept away from to the erection column, the clamp plate is connected in the one end that the valve body was kept away from to the erection column, the inspection cap cover is established outside the erection column, elastic component butt is between clamp plate and inspection cap, make the inspection cap butt on the valve body all the time under normal operating condition, prevent to appear the clearance between valve body and the inspection cap, inside from the one end that the inspection cap is close to the valve body entering valve body of foreign matter.

The self-closing valve provided in the present embodiment will be described in detail below with reference to the accompanying drawings.

FIG. 1 is an exploded view of a self-closing valve provided in accordance with an embodiment of the present application. As shown in fig. 1, the present application provides a self-closing valve, which comprises a valve body 100, a checking cap 300, a reset cap 400 and a limiting assembly 200, wherein the valve body 100 is installed on other pipelines such as a gas pipeline, etc. for communicating the pipelines, and automatically closing and cutting off the pipelines when the gas pressure is abnormal, so as to ensure the safety of gas use; the reset cap 400 is used for manual reset after the self-closing valve is automatically closed; the inspection cap 300 is used for inspecting the state of the self-closing valve, and a user can determine the opening and closing state of the self-closing valve particularly through the position relation between the reset cap 400 and the inspection cap 300; the limiting assembly 200 is used for limiting the position of the inspection cap 300, so that the inspection cap 300 is always kept to abut against the valve body 100, and foreign matters are prevented from entering the valve body 100 from a gap between the inspection cap 300 and the valve body 100 to damage the valve body 100.

FIG. 2 is a cross-sectional view of a self-closing valve provided in an embodiment of the present application. Referring to fig. 1 and 2, the valve body includes a first cover body 101 and a second cover body 102, the first cover body 101 and the second cover body 102 together enclose to form an air cavity 110, the second cover body 102 is provided with an air inlet 121, an air outlet 122 and a first mounting opening 123 which are communicated with the air cavity 110, the air inlet 121 and the air outlet 122 are both used for connecting a pipeline, the first cover body 101 is provided with a first mounting opening 123, a reset cap 400 covers the first mounting opening 123, and a check cap 300 is arranged between the valve body 100 and the reset cap 400. Specifically, the first mounting opening 123 is provided in the first cover 101.

The limiting assembly 200 comprises a pressing plate 210 and an elastic member 220, the valve body 100 is provided with a mounting column 130, a first mounting port 123 is located on the end face, far away from the valve body 100, of the mounting column 130, specifically, the mounting column 130 is arranged on the first cover body 101, the pressing plate 210 is connected to one end, far away from the valve body 100, of the mounting column 130, the inspection cap 300 is sleeved outside the mounting column 130, the elastic member 220 abuts against between the pressing plate 210 and the inspection cap 300, when resetting is needed, pressure is applied by hands, the elastic member 220 is compressed, the inspection cap 300 can be lifted, and therefore the resetting cap 400 is driven to reset; in a natural state, the elastic member 220 is kept in an original state, and the inspection cap 300 can be always abutted against the valve body 100, so that a gap between the valve body 100 and the inspection cap 300 is prevented, and foreign matters are prevented from entering the valve body 100 from one end of the inspection cap 300 close to the valve body 100.

As shown in fig. 2, the reset cap 400 may include a top wall 410 and a side wall 420, the side wall 420 is connected to a side surface of the top wall 410 facing the valve body 100, and the side wall 420 encloses an area smaller than that of a side surface of the top wall 410, and the top wall 410 protrudes from the side wall 420 in a radial direction of the top wall 410 to form a brim 411.

The inspection cap 300 is sleeved outside the side wall 420 of the reset cap 400, the brim 411 of the reset cap 400 is lapped on the inspection cap 300 in a natural state, the reset cap 400 can move in the inspection cap 300 along the axial direction thereof to realize the opening and closing of the self-closing valve, in addition, the length of the side wall 420 is enough to ensure that the inspection cap 300 is always sleeved outside the side wall 420 of the reset cap 400 in the moving process, the reset cap 400 is prevented from being separated from the inspection cap 300, and therefore sundries are prevented from entering from one end, far away from the valve body 100, of the reset cap 400.

When the self-closing valve is closed, the inspection cap 300 moves towards the valve body 100, the brim 411 of the reset cap 400 abuts against one end, far away from the valve body 100, of the inspection cap 300, one end, close to the valve body 100, of the inspection cap 300 abuts against the valve body 100, no gap exists between the upper end and the lower end of the inspection cap 300, and foreign matters can be prevented from entering the interior of the valve body 100 from the gaps between the upper end and the lower end of the inspection cap 300; when the self-closing valve is opened, the inspection cap 300 moves back to the valve body 100, a distance exists between the brim 411 of the reset cap 400 and one end, far away from the valve body 100, of the inspection cap 300, but the inspection cap 300 is still sleeved outside the side wall 420 of the reset cap 400, the outer wall surface of the side wall 420 of the reset cap 400 is attached to the inner wall surface of the inspection cap 300 or has a small gap, and large foreign matters can be prevented from entering the valve body 100 from the gap between the upper end and the lower end of the inspection cap 300.

It will be understood that in the description of the present specification, a "gap" refers to a clear gap, and the absence of a gap does not represent a complete seal, as long as the gap is small enough to prevent the ingress of foreign matter such as sand.

The self-closing valve provided by the embodiment can further comprise a membrane 500 and a valve rod 600, the membrane 500 is arranged in the air cavity 110, the valve rod 600 can be movably arranged in the first mounting hole 123 in a penetrating mode, one end of the valve rod 600 is connected with the membrane 500, and the other end of the valve rod 600 is connected with the reset cap 400, so that the reset cap 400 can move up and down to pull the membrane 500 through the valve rod 600, and therefore opening and closing of the self-closing valve are controlled.

The portion of the valve rod 600 movably penetrating through the first mounting opening 123 is a connecting section, and the cross-sectional shape of the connecting section of the valve rod 600 may be adapted to the shape of the first mounting opening 123, for example, the cross-sectional shape of the valve rod 600 and the shape of the first mounting opening 123 may be both "D" shape or non-perfect circle such as square shape, so as to avoid the valve rod 600 from rotating in the first mounting opening 123, or the cross-sectional shape of the valve rod 600 and the shape of the first mounting opening 123 may also be both circular, so as to simplify the manufacturing. The connecting section of valve rod 600 and first installing port 123, its size and the size phase-match of first installing port 123, so, valve rod 600 can seal first installing port 123, avoids debris to get into in the valve body 100 from first installing port 123 to, can also guarantee the accuracy of valve rod 600 direction, reduce and rock.

The basic principle of the self-closing valve is that permanent magnetic material is magnetized according to design requirements to form a permanent memory multi-pole permanent magnetic linkage mechanism, changes of gas pressure parameters passing through the permanent magnetic linkage mechanism are identified, and when the gas pressure parameters exceed a safety set value, the valve is automatically closed, and a gas source is cut off.

As shown in fig. 2, a magnetic component 800 is further disposed below the diaphragm 500, the valve rod 600 is made of a material capable of generating a magnetic attraction force with the magnetic component 800, for example, the valve rod 600 may be made of a material such as iron, cobalt, nickel, or the like, the magnetic component 800 can be attracted with the valve rod 600, that is, a magnetic attraction force is generated between the magnetic component 800 and the valve rod 600, when the self-closing valve normally works, the magnetic attraction force between the magnetic component 800 and the valve rod 600 and the pressure of the gas in the self-closing valve on the diaphragm 500 are kept balanced; when overpressure exists in the self-closing valve, the pressure of gas in the self-closing valve on the diaphragm 500 is overlarge and is larger than the sum of magnetic attraction between the magnetic component 800 and the valve rod 600 and the gravity of each component, the magnetic component 800 is separated from the valve rod 600, and the magnetic component 800 falls freely under the action of gravity, so that a fluid channel of the self-closing valve is closed; when the internal pressure of the self-closing valve is under low, the pressure of the gas in the self-closing valve on the diaphragm 500 is too small and is smaller than the sum of the magnetic attraction force between the magnetic component 800 and the valve rod 600 and the gravity of each component, so that the magnetic component 800 moves downwards, and the fluid channel of the self-closing valve is closed.

For example, the self-closing valve may further include an intelligent control portion 700, where the intelligent control portion 700 is configured to determine and control opening and closing of the self-closing valve, and when the intelligent control portion 700 detects that the air pressure in the pipeline exceeds a preset range (overpressure or underpressure), the self-closing valve is controlled to automatically close.

In addition, the self-closing valve provided by this embodiment may further include an auxiliary valve body 900, the auxiliary valve body 900 may be located at the end of the air inlet 121 of the valve body 100, and the auxiliary valve body 900 may also be located at the end of the air outlet 122 of the valve body 100, and is communicated with a passage where the valve body is located, so as to be used as a backup when the valve body 100 fails, and implement an effect of controlling the on-off of a pipeline.

Specifically, the handle 910 is disposed on the auxiliary valve body 900, a user can control opening and closing of the valve through the handle 910 on the auxiliary valve body 900, the auxiliary valve body 900 may be a ball valve or a butterfly valve, and the embodiment is not limited.

Fig. 3 is a schematic view of the first cover in fig. 1. As shown in fig. 1 and 3, the limiting assembly 200 may further include a fixing member 230, the mounting column 130 has a large diameter section 131 and a small diameter section 132, one end of the large diameter section 131 is connected to the valve body 100 (the first cover 101), the other end of the large diameter section 131 is connected to the small diameter section 132, one end of the large diameter section 131 connected to the small diameter section 132 has a step surface 1311, and the small diameter section 132 is mounted with the fixing member 230, so that the pressing plate 210 is mounted between the step surface 1311 and the fixing member 230, thereby improving the mounting stability of the limiting assembly 200.

Illustratively, the fixing member 230 may be a snap spring, the small-diameter section 132 is provided with a ring-shaped clamping groove 1321, the snap spring is clamped in the ring-shaped clamping groove 1321 to fix the snap spring on the mounting post 130, and the pressing plate 210 is installed between the step surface 1311 and the snap spring to fix the pressing plate 210 on the mounting post 130.

In practical applications, the pressing plate 210 may be a plastic member so as to be manufactured into a specific shape, thereby reducing the manufacturing cost; the fixing member 230 may be a metal member, and the metal clip has good elasticity and structural strength, and is easily clamped in the annular clamping groove 1321, and firmly fixes the pressing plate 210 on the mounting post 130.

In other examples, the pressing plate 210 may also be a metal snap spring with a large surface area, so as to be used for abutting against the elastic member 220 and leaving a setting space for the limiting hole 211, thereby achieving the purposes of simplifying the structure and improving the assembly efficiency.

In addition, the self-closing valve provided by the embodiment further includes a circuit board, the valve body 100 is provided with a second mounting opening 124 matched with the circuit board, the circuit board is mounted in the second mounting opening 124, the reset cap 400 is covered outside the second mounting opening 124, and the inspection cap 300 is also covered outside the second mounting opening 124 to protect the circuit board. Moreover, the second mounting opening 124 is matched with the circuit board, and after the circuit board is mounted, no gap is formed between the second mounting opening 124 and the circuit board, so that foreign matters such as sand and stones are not easy to enter, and the membrane 500 can be prevented from being damaged.

It can be seen that, in this embodiment, besides "the limiting assembly 200 is disposed to reduce the gap between the inspection cap 300 and the valve body 100, and prevent the foreign object from entering the interior of the valve body 100 from the gap", the valve body 100 of the self-closing valve is provided with the first mounting port 123 and the second mounting port 124, which are both provided with the matching components, and the valve body 100 of the self-closing valve does not have the gap, so that the foreign object can be further prevented from entering the interior of the valve body 100, and the membrane 500 is prevented from being damaged.

As shown in fig. 3, the mounting post 130 may have an avoiding notch 134, and the avoiding notch 134 is used for avoiding the circuit board, so as to prevent the circuit board from being scratched by the mounting post 130, thereby protecting the circuit board.

FIG. 4 is a schematic view of the inspection cap of FIG. 1. As described in conjunction with fig. 3 and 4, the mounting post 130 has a limiting section 133, one end of the inspection cap 300 close to the valve body 100 has a butting wall 310, the butting wall 310 of the inspection cap 300 has a mounting hole 330, the mounting hole 330 has a matching surface 331 corresponding to the limiting section 133, the limiting section 133 and the matching surface 331 are mutually matched to prevent the inspection cap 300 from rotating relative to the mounting post 130, so as to ensure a good corresponding relationship between the butting wall 310 of the inspection cap 300 and the limiting component 200, and ensure the reliability of limiting.

Illustratively, the inspection cap 300 can also be provided with an inner concave part 340, when the inspection cap 300 needs to be lifted, fingers can extend into the inner concave part 340, and the inspection cap 300 is lifted by means of the supporting force between the fingers and the wall surface of the inner concave part 340, so that the problems of overlarge resistance and difficulty in lifting are avoided.

Fig. 5 is a schematic view of the platen of fig. 1. As shown in fig. 4 and 5, a limiting post 320 extends from a side surface of the abutting wall 310 facing away from the valve body 100, the pressure plate 210 has a limiting hole 211, and the limiting post 320 is inserted into the limiting hole 211 to limit a relative position between the pressure plate 210 and the abutting wall 310 of the inspection cap 300, so that two ends of the elastic member 220 between the abutting wall 310 and the pressure plate 210 can abut against two surfaces which are relatively stationary, and the elastic member 220 is prevented from being deformed by the relative rotation between the pressure plate 210 and the abutting wall 310 of the inspection cap 300.

Fig. 6 is a schematic view of the elastic member of fig. 1. As shown in fig. 2 and fig. 6, the elastic member 220 may be a spring, and the spring is sleeved outside the limiting post 320, so that the limiting post 320 can limit the deformation of the spring near the limiting post 320, so as to avoid the spring from deflecting during deformation, avoid the spring from falling off, and improve the connection reliability of the limiting assembly 200.

For example, the position-limiting post 320 may be disposed near the engagement surface 331 of the mounting hole 330, the engagement surface 331 corresponds to the position-limiting section 133, the engagement surface 331 is received in the mounting hole 330, and the position-limiting section 133 is received in the mounting post 130, both of which may provide sufficient mounting space for the spring.

In practical application, the elastic member 220 may be a conical spring, and the aperture of the small-diameter end 221 of the conical spring may be matched with the outer diameter of the limiting post 320, so as to further limit the position of the spring, avoid the spring from deflecting during deformation, avoid the spring from contacting the mounting post 130, and the conical spring has good contractibility, and is compressible to a shorter state than a common spring, and the movement range of the inspection cap 300 may be increased by using the conical spring.

It is to be understood that the illustrated construction of the embodiments of the present application does not constitute a specific limitation to the self-closing valve. In other embodiments of the present application, the self-closing valve may include more or fewer components than shown, or some components may be combined, some components may be separated, or a different arrangement of components.

In the description of the present application, it is to be understood that the terms "length," "upper," "lower," "inner," "outer," "axial," "radial," and the like are used in the positional or orientational relationships indicated in the drawings for the purpose of convenience in describing the present application and simplifying the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and include, for example, fixed connections, releasable connections, or integral parts thereof; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.

In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present application, and are not limited thereto; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and these modifications or substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims (10)

1. A self-closing valve is characterized by comprising a valve body, a checking cap, a resetting cap and a limiting assembly;

the valve body comprises a first cover body and a second cover body, the first cover body and the second cover body are jointly arranged to form an air cavity in an enclosing mode, the second cover body is provided with an air inlet and an air outlet which are communicated with the air cavity, and the air inlet and the air outlet are both used for being connected with a pipeline; the first cover body is provided with a first mounting opening, the reset cap is arranged outside the first mounting opening, and the inspection cap is arranged between the valve body and the reset cap;

the limiting assembly comprises a pressing plate and an elastic piece, a mounting column is arranged on the valve body, a first mounting opening is located at the position, away from the end face of the valve body, of the mounting column, the pressing plate is connected to the position, away from the end of the valve body, of the mounting column, the inspection cap is sleeved outside the mounting column, and the elastic piece is abutted to the pressing plate and between the inspection caps.

2. The self-closing valve according to claim 1, wherein the limiting assembly further comprises a fixing member, the mounting post has a large diameter section and a small diameter section, one end of the large diameter section is connected with the valve body, the other end of the large diameter section is connected with the small diameter section, one end of the large diameter section connected with the small diameter section is provided with a step surface, the small diameter section is provided with the fixing member, and the pressing plate is installed between the step surface and the fixing member.

3. The self-closing valve according to claim 2, wherein the fixing member is a snap spring, the small diameter section is provided with an annular clamping groove, the snap spring is clamped in the annular clamping groove, and the pressing plate is installed between the step surface and the snap spring.

4. The self-closing valve according to claim 1, wherein one end of the inspection cap close to the valve body is provided with an abutting wall, a limiting column extends out from one side surface of the abutting wall, which faces away from the valve body, the pressure plate is provided with a limiting hole, and the limiting column is inserted into the limiting hole.

5. The self-closing valve according to claim 4, wherein the elastic member is a spring, and the spring is sleeved outside the limiting column.

6. The self-closing valve according to claim 5, wherein the elastic member is a conical spring, and the aperture of the small diameter end of the conical spring is matched with the outer diameter of the limiting column.

7. The self-closing valve according to claim 4, wherein the mounting post has a limiting section, the abutment wall has a mounting hole, and the mounting hole has a mating surface corresponding to the limiting section.

8. Self-closing valve according to any of claims 1 to 6, wherein the reset cap comprises a top wall and a side wall, the side wall is connected to a side surface of the top wall facing the valve body, the top wall extends beyond the side wall in a radial direction of the top wall to form a brim; the inspection cap is sleeved outside the side wall.

9. The self-closing valve according to any of the claims 1 to 6, further comprising a diaphragm and a valve stem, wherein the diaphragm is arranged in the air cavity, the valve stem is movably arranged in the first mounting port in a penetrating way, one end of the valve stem is connected with the diaphragm, and the other end of the valve stem is connected with a reset cap;

the valve rod is movably arranged on the portion penetrating through the first mounting hole and is a connecting section, the cross section of the connecting section is matched with that of the first mounting hole, and the size of the connecting section is matched with that of the first mounting hole.

10. The self-closing valve according to any of the claims 1 to 6, further comprising a circuit board, wherein the valve body is provided with a second mounting port matched with the circuit board, the circuit board is mounted in the second mounting port, and the reset cap is arranged outside the second mounting port.

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