CN110296249B

CN110296249B - Composite air valve

Info

Publication number: CN110296249B
Application number: CN201910610271.1A
Authority: CN
Inventors: 韩安伟; 陈乙飞; 李维槽; 孙世林
Original assignee: Anhui Redstar Valve Co Ltd
Current assignee: Anhui Redstar Valve Co Ltd
Priority date: 2019-06-14
Filing date: 2019-07-08
Publication date: 2024-06-11
Anticipated expiration: 2039-07-08
Also published as: CN110296249A; CN210461839U

Abstract

The invention relates to the technical field of pipeline valves, in particular to an air valve. An air valve is arranged on a pipeline and comprises a valve body, a valve cover, a first valve core assembly, a barrel assembly, a second valve core assembly and a micro exhaust valve, wherein the valve cover is arranged on the valve body, a valve cavity is arranged in the valve body, one end of the valve body is provided with an inlet connected with the pipeline, the valve cover is provided with an outlet, the barrel assembly is arranged on the valve cover, one end of the barrel assembly extends into the valve cavity, and the first valve core assembly is sleeved on the barrel assembly and can move along the barrel assembly so as to open or seal the outlet; the cylinder assembly is provided with a first communication hole, a second communication hole and an exhaust hole which are respectively communicated with the inside of the cylinder assembly, the micro exhaust valve is arranged on the cylinder assembly and is communicated with the inside of the cylinder assembly through the second communication hole, and the second valve core assembly is accommodated in the cylinder assembly and is used for opening or sealing the exhaust hole.

Description

Composite air valve

Technical Field

The invention relates to the technical field of pipeline valves, in particular to a composite air valve.

Background

The problems of air lock, pipe explosion, equipment damage caused by water hammer and the like can occur in the water supply pipeline in the water delivery and distribution process, the normal water supply is seriously influenced, the water supply efficiency is reduced, and part of water supply engineering is paralysed even because of the water supply efficiency. Most of this problem can be solved by installing an air valve of the appropriate type and size on the pipe. However, if the air valve is improperly selected, a tube explosion and an artificial manufacturing accident may be caused.

At present, the common air valve has the advantages that the air inlet and the air outlet of the common air valve pass through the same physical large orifice, and the air inlet and the air outlet have a large amount of air inlet and air outlet capabilities, but the end time of high-speed air outlet of the large orifice can generate abrupt change of the flow velocity to cause valve closing water hammer. During the interruption of the water hammer, a large amount of air in the pipeline is discharged at a high speed, and an air bag cannot be formed to buffer or reduce the damage of the water hammer.

Disclosure of Invention

In view of the above, it is necessary to provide an air valve capable of adapting to various working conditions and avoiding water hammer phenomenon

In order to achieve the above purpose, the present invention adopts the following technical scheme:

The composite air valve is arranged on a pipeline and comprises a valve body, a valve cover, a first valve core component, a barrel component, a second valve core component and a trace exhaust valve, wherein the valve cover is arranged on the valve body, a valve cavity is arranged in the valve body, one end of the valve body is provided with an inlet connected with the pipeline, an outlet is arranged on the valve cover, the barrel component is arranged at the outlet, one end of the barrel component stretches into the valve cavity, and the valve core component is sleeved on the barrel component and can move along the barrel component so as to open or seal the outlet; the cylinder assembly is provided with a first communication hole, a second communication hole and an exhaust hole which are respectively communicated with the inside of the cylinder assembly, the micro exhaust valve is installed on the cylinder assembly and is communicated with the inside of the cylinder assembly through the second communication hole, the second valve core assembly is contained in the cylinder assembly and is used for opening or sealing the exhaust hole, and the first communication hole is communicated with the valve cavity and the inlet.

In one embodiment, the cylinder assembly comprises a cylinder and a cylinder cover, one end of the cylinder extends into the valve cavity from the outlet, the other end of the cylinder is mounted on the valve cover, the cylinder cover is arranged at the other end of the cylinder, and the micro exhaust valve is mounted on the cylinder cover.

In one embodiment, a liquid storage part is arranged in the cylinder assembly and can drive the second valve core assembly to open or seal the exhaust hole.

In one embodiment, the liquid storage part is fixed inside the cylinder assembly and is located at the first communication hole, the liquid storage part extends towards the valve cover, a working space for opening or sealing the exhaust hole is formed between the outer wall of the liquid storage part and the inner wall of the cylinder assembly, a channel is formed in the liquid storage part, the channel is communicated with the first communication hole and the working space, and the outer wall of the liquid storage part is sleeved with the second valve core assembly.

In one embodiment, the liquid storage member is movably disposed inside the cylinder assembly, the liquid storage member can open or close the first communication hole, the second valve core assembly is detachably disposed on the liquid storage member, and both the second valve core assembly and the liquid storage member can move inside the cylinder assembly.

In one embodiment, the reservoir has a density greater than the density of the medium in the conduit.

In one embodiment, a cambered surface is formed on one side of the liquid storage part, which is close to the first communication hole, and the cambered surface is used for being attached to the inner wall of the tail end of the first communication hole so as to close the first communication hole.

In one embodiment, the second valve core assembly includes a floating member and a first sealing member, the first sealing member is mounted on the floating member and is used for being matched with the exhaust hole, the density of the floating member is smaller than that of a medium in the pipeline, and the floating member can drive the first sealing member to be close to the exhaust hole under the action of air pressure and/or medium buoyancy so as to seal the exhaust hole.

In one embodiment, the first valve core assembly comprises a valve core, a second sealing element and an elastic element, the valve core is sleeved on the cylinder assembly, the second sealing element is mounted on one side face, close to the inlet, of the valve core, the elastic element is sleeved on the cylinder assembly, one end of the elastic element abuts against the cylinder assembly, the other end of the elastic element abuts against the valve core, and the elastic element is used for providing acting force for resetting of the valve core.

In one embodiment, the micro exhaust valve is provided with a vent hole, and the second communication hole is communicated with the atmosphere through the vent hole.

Compared with the prior art, the air valve has the advantages of being capable of adapting to various working conditions and avoiding the phenomenon of water hammer in a pipeline.

Drawings

Fig. 1 is a schematic structural view of an air valve provided by the invention.

Fig. 2 is a schematic diagram of the structure of the air valve provided by the invention, wherein the micro exhaust valve is omitted.

Fig. 3 is a schematic structural view of the air valve with the filtering device.

Fig. 4 is a cross-sectional view of an air valve in an intake mode during a pipe evacuation stage or when a water column breaks in accordance with an embodiment of the present invention.

Fig. 5 is a cross-sectional view of an air valve in an exhaust mode during a water filling stage of a pipe according to an embodiment of the present invention.

Fig. 6 is a cross-sectional view of an air valve in a micro-venting mode during a pipe running stage or when the water column is again filled in an embodiment of the present invention.

Fig. 7 is a cross-sectional view of an air valve in an intake mode during a pipe evacuation stage or when a water column breaks in another embodiment of the present invention.

Fig. 8 is a cross-sectional view of an air valve in an exhaust mode during a water filling stage of a pipe according to another embodiment of the present invention.

Fig. 9 is a cross-sectional view of an air valve in a micro-venting mode during a pipe running stage or when the water column is again filled in another embodiment of the present invention.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "or/and" as used herein includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, the present invention provides an air valve 100, which is mounted to a pipe (not shown) for supplementing air into the pipe or exhausting air from the pipe.

Referring to fig. 2 and 4, the composite air valve 100 includes a valve body 10, a valve cover 20, a first valve core assembly 30, a cylinder assembly 40, a second valve core assembly 50, and a micro exhaust valve 60, wherein the valve cover 20 is covered on the valve body 10, a valve cavity 11 is provided in the valve body 10, an inlet 12 connected with a pipeline is provided at one end of the valve body 10, an outlet 21 is provided on the valve cover 20, the cylinder assembly 40 is mounted on the valve cover 20 (i.e. the cylinder assembly is provided at the outlet), one end of the cylinder assembly 40 extends into the valve cavity 11, the first valve core assembly 30 is sleeved on the cylinder assembly 40 and can move along the cylinder assembly 40 to open or seal the outlet 21; the cylinder assembly 40 is provided with a first communication hole 41, a second communication hole 42 and an exhaust hole 43 which are respectively communicated with the inside of the cylinder assembly 40, the micro exhaust valve 60 is installed on the cylinder assembly 40 and is communicated with the inside of the cylinder assembly 40 through the second communication hole 42, the second valve core assembly 50 is accommodated in the cylinder assembly 40 and is used for opening or sealing the exhaust hole 43, and the first communication hole 41 is communicated with the valve cavity 11 and the inlet 12.

The valve body 10 is generally "cylindrical" in shape. Of course, in other embodiments, the valve body 10 may take other shapes. One end of the valve body 10 is provided with the inlet 12, and the other end is provided with an opening; the valve cover 20 covers the opening and is locked with the valve body 10 through a fastener, so that the valve body 10 and the valve cover 20 enclose the valve cavity 11. Preferably, in the present embodiment, the fastener is a bolt, the inlet 12 is circular, and the inlet 12 is connected with the pipeline and sealed with the pipeline by a sealing member such as a rubber ring.

The valve cover 20 is approximately in a disc shape, and the valve cover 20 is in sealing connection with the valve body 10 through a sealing element.

Preferably, the valve cover 20 is provided with a step, the valve body 10 is also provided with a step, and the step on the valve body 10 is matched with the step on the valve cover 20 to realize the installation of the valve cover 20; the seal is mounted on a step of the valve body 10.

The first valve core assembly 30 comprises a valve core 31, a second sealing element 32 and an elastic element 33, the valve core 31 is sleeved on the cylinder assembly 40, the second sealing element 32 is mounted on one side surface of the valve core 31 close to the inlet 12, and the second sealing element 32 is used for matching with the inner side surface of the valve cover 20 to realize the sealing of the outlet 21; the elastic member 33 is sleeved on the cylinder assembly 40, one end of the elastic member 33 abuts against the cylinder assembly 40, the other end abuts against the valve core 31, and the elastic member 33 is used for providing a force for resetting the valve core 31.

In this embodiment, the valve core 31 is annular, and the elastic member 33 is cylindrical. The valve core 31 can be contacted and sealed with the valve cover 20 and the cylinder 44 under the upward force of the elastic piece 33, so as to close the outlet 21.

When the pipeline is emptied or the water column is broken, negative pressure is generated in the pipeline, the valve core 31 overcomes the acting force of the elastic piece 33, and the outlet 21 is opened, so that a large amount of air is introduced into the pipeline through the outlet 21, the valve cavity 11 and the inlet 12, and the pipeline is prevented from being collapsed or the lining of the pipeline from falling off due to instability of the negative pressure.

Preferably, the second sealing member 32 is a sealing ring, and the second sealing member 32 may be locked on the valve core 31 by a fixing member, or may be mounted on the valve core 31 by vulcanization, gluing, sleeving, or the like.

The cylinder assembly 40 comprises a cylinder 44 and a cylinder cover 45, one end of the cylinder 44 extends into the valve cavity 11 from the outlet 21, the other end of the cylinder is mounted on the valve cover 20, and the micro exhaust valve 60 is mounted on the valve cover 20. The first communication hole 41 is opened on the cylinder 44, and the second communication hole 42 and the exhaust hole 43 are opened on the cylinder cover 45. The cylinder 44 is of a cylindrical configuration, although in other embodiments, the cylinder 44 may have other shapes.

It will be appreciated that, since one end of the cylinder 44 extends into the valve cavity 11, the overall height of the air valve 100 can be reduced, and the volume of the air valve 100 can be reduced, so that the air valve 100 can be more conveniently installed, has a more compact structure, and can better meet/adapt to various installation environments.

Preferably, the cylinder 44 extends inward into the central portion of the valve cover 20 and into the valve chamber 11, and the outlet 21 is formed between the outer wall of the cylinder 44 and the inner wall of the valve cover 20 to be in communication with the atmosphere.

Preferably, the axis of the vent hole 43 or the axis of the second communication hole 42 may be disposed to coincide with the axis of the cylinder 44 (the axis of the first communication hole 41).

Further, the valve cover 20 is provided with a rib member 22, and the cylinder assembly 40 is fixed to the valve cover 20 by the rib member 22, so that a structure integrated with the valve cover 20 is formed.

As shown in fig. 3, the valve cover 20 is provided with a filtering device 23, and the filtering device 23 is used for filtering impurities in the air, so as to prevent the impurities from entering the air valve 100 from the outlet 21 or the inside of a pipeline.

Specifically, the filtering device 23 is a filter screen, and the filter screen is enclosed at the outlet 21. Of course, in other embodiments, the filtering device may be other structures with filtering functions.

Preferably, the cylinder body 44 and the cylinder cover 45 are locked by a fastener, and the plate rib 22 and the cylinder cover 45 are connected by a fastener, welding or casting, etc. so as to realize the installation of the cylinder body assembly 40.

Further, a liquid storage member 46 is disposed inside the cylinder assembly 40, and the liquid storage member 46 forms a liquid storage space 47 inside the cylinder assembly 40, that is, forms a working space for opening or sealing the air exhaust hole 43 by the second valve core assembly 50, and the second valve core assembly 50 is accommodated in the liquid storage space 47 and moves in the liquid storage space 47 to seal or open the air exhaust hole 43.

Preferably, the liquid storage piece 46 extends into the central portion of the cylinder 44, and the liquid storage piece 46 may be integrally formed with the cylinder 44 or may be separately formed, so as to reduce the overall height of the air valve 100.

The second valve core assembly 50 includes a floating member 51 and a first sealing member 52, the first sealing member 53 is mounted on the floating member 51 and is used for being matched with the exhaust hole 43, the density of the floating member 51 is smaller than that of a medium (i.e. liquid) in a pipeline, and the floating member 51 can drive the first sealing member 52 to be close to the exhaust hole 43 under the action of air pressure and/or medium buoyancy so as to seal the exhaust hole 43. Of course, in other embodiments, the second valve element assembly 50 may include other structures or be configured so long as the second valve element assembly 50 is capable of sealing the exhaust hole 43 under the action of air pressure and/or medium buoyancy.

In this embodiment, the first sealing member 52 is a sealing ring or other functional member having a sealing effect.

The micro exhaust valve 60 may be of a lever type structure commonly used at present, or may be of other structures. The minute exhaust valve 60 is provided with a vent hole 61, and the second communication hole 42 communicates with the atmosphere through the vent hole 61.

In an embodiment, the density of the second valve element assembly 50 is less than that of the medium seal in the pipeline, the liquid storage member 46 is fixed inside the cylinder assembly 40 and is located at the first communication hole 41, the liquid storage member 46 extends towards the cylinder cover 45, and the liquid storage space 47 is formed between the outer wall of the liquid storage member 46 and the inner wall of the cylinder assembly 40, that is, a working space for opening or sealing the exhaust hole by the second valve element assembly 50 is formed. Preferably, the liquid storage space 47 has a concave cylindrical shape. The liquid storage member 46 is provided with a channel 461, the channel 461 communicates the first communication hole 41 with the inside of the cylinder assembly 40, and the second valve core assembly 50 is sleeved on the outer wall of the liquid storage member 46 and can move along the outer wall of the liquid storage member 46 to seal or open the air vent 43.

In this embodiment, the reservoir 46 is cylindrical in cross-section. The liquid storage member 46 and the cylinder 44 are integrally formed.

The axis of the second communication hole 42 is arranged to coincide with the axis of the passage 461. The number of the exhaust holes 43 is plural, and the plural exhaust holes 43 are arranged on the cylinder cover 45 in the circumferential direction of the cylinder cover 45. The air valve is mounted at the highest point,

As shown in fig. 4, in the pipe evacuation stage or when the water column breaks (i.e., the water column in the pipe is discontinuous), negative pressure is generated in the pipe (not shown), the valve core 31 moves downward (moves toward the inlet 12) against the force of the elastic member 33, and opens the outlet 21, so that a large amount of air is introduced into the pipe through the outlet 21, the valve cavity 11 and the inlet 12; the second valve element assembly 50 can also overcome the buoyancy of the working fluid (medium in the conduit), move downward (toward inlet 12) to open the vent 43, and then the gas is admitted into the conduit through the vent 43, the interior of the barrel 44, the passageway 461, and the inlet 12. The minute amount of air-discharging valve 60 is also opened and minute amounts of air are introduced into the duct through the second communication hole 42, the inside of the cylinder 44, the passage 461 and the inlet 12. It can be appreciated that when the pipe empties or the water column breaks, the air valve 100 can quickly and largely intake air into the pipe through three independent ventilation channels in time, so as to prevent the pipe from being damaged due to collapse or falling off of the lining of the pipe caused by instability of the negative pressure.

As shown in fig. 5, in the pipe water filling stage, the second valve core assembly 50 is accommodated in the inner liquid storage space 47 and is not acted upwards by the air pressure in the pipe, the exhaust port 43 is kept open, and a large amount of gas in the pipe is exhausted from the pipe outwards through the inlet 12, the channel 461, the inside of the cylinder 44 and the exhaust hole 43, so that the pipe is full, and the water filling time is shortened; at the same time, the valve core 31 moves close to the outlet 21 and closes the outlet 21 under the combined action of the elastic piece 33 and the air pressure in the pipeline, the exhaust gas quantity is properly controlled, the water filling speed of the pipeline is restrained, and the phenomenon that the air valve 100 closes the valve water hammer (the water columns collide with each other) due to too fast water filling is prevented.

As shown in fig. 6, in the pipe operation stage, the outlet 21 and the exhaust hole 43 are kept closed, and a minute amount of air in the pipe is separated out through the inlet 12, the passage 461, the inside of the cylinder 44, the second communication hole 42 and the minute amount of exhaust valve 60 under the working pressure, thereby eliminating the air pocket, reducing the air resistance, and improving the water supply efficiency. When the water column is broken, a large amount of air is fed into the air valve; at the moment the water column again closes (hits or connects), the valve element 31 remains closed under the action of the elastic element 33 and seals the outlet 21 under the effect of the pressure in the pipe. The second valve core assembly 50 is lifted by buoyancy of the working fluid in the fluid storage space 47, and closes the sealing exhaust port 43 under the action of the internal pressure of the pipeline, so that a large amount of sucked air is trapped to form a large air bag, the energy of the water hammer is absorbed, and the harm of the water hammer is buffered or weakened; then, the micro exhaust valve 60 slowly discharges the sucked air under the working pressure, and the normal operation state of the pipe is restored.

In another embodiment, as shown in fig. 7-9, the structure of the air valve 100 is substantially similar to the air valve 100 in the above-described embodiment, and the detailed description is omitted herein, except that: the liquid storage member 46 is movably disposed inside the cylinder assembly 40, the liquid storage member 46 can open or close the first communication hole 41, the second valve core assembly 50 is detachably disposed on the liquid storage member 46, and the second valve core assembly 50 can move inside the cylinder assembly 40 to seal or open the air vent 43.

In this embodiment, the liquid storage space 47 defined between the liquid storage member 46 and the inner wall of the cylinder 44 is an internal cavity of the cylinder 44.

In this embodiment, the reservoir 46 changes from a ring shape to a cylindrical or spherical shape, the reservoir 46 changes from a ring shape to a spherical or disk shape, and the reservoir 46 has a density greater than the density of the medium in the conduit.

The side of the liquid storage member 46, which is close to the first communication hole 41, has an arc surface, and the arc surface is used to be attached to the inner wall of the end of the first communication hole 41, so as to close the first communication hole 41. Thus, the reservoir 46 can function as a one-way check reservoir from the second communication hole 42, through the inside of the cylinder 44, to the exhaust port 43.

In this embodiment, the axis of the exhaust hole 43 is overlapped with the axis of the first communication hole 41, the exhaust hole 43 is disposed in the middle of the cylinder cover 45, the number of the second communication holes 42 may be plural or one, and the second communication holes 42 are disposed offset from the middle of the cylinder cover 45 with respect to the first communication hole 41; at this time, the minute exhaust valve 60 is also mounted eccentrically to the cylinder cover 45 at the second communication hole 42.

The working principle of this embodiment is as follows:

As shown in fig. 7, when the pipe is emptied or the water column breaks, negative pressure is generated in the pipe, the valve core 31 overcomes the acting force of the elastic member 33 and moves downwards (moves towards the direction close to the inlet 12), the outlet 21 is opened, and a large amount of external air is introduced into the pipe through the outlet 21, the valve cavity 11 and the inlet 12, so that the pipe is prevented from being collapsed or the pipe lining is prevented from falling off due to the instability of the negative pressure. At the same time, the reservoir 46 sinks to the bottom of the cylinder 44, temporarily closing the first communication hole 41, and the exhaust port 43 and the minute exhaust valve do not admit air.

As shown in fig. 8, in the pipe water filling stage, the valve element 31 closes the outlet 21 under the combined action of the elastic member 33 and the air pressure in the pipe. At the same time, the reservoir 46 is subjected to the upward action of the air pressure in the pipe, and the first communication hole 41 is gradually opened. Thus, the exhaust amount is properly controlled, the water filling speed of the pipeline is restrained, and the air valve is prevented from closing the valve water hammer due to too fast water filling. When the first communication hole 41 is opened, the air valve 100 is largely exhausted from the pipe through the inlet 12, the first communication hole 41, the inside of the cylinder 44 and the exhaust hole 43, so that a full pipe flow is formed, and the water filling time is shortened.

As shown in fig. 9, in the pipe operation stage, the outlet 21 and the exhaust port 43 are kept closed, and a trace amount of air in the pipe is separated out through the inlet 12, the first communication hole 41, the inside of the cylinder 44, the second communication hole 42 and the trace amount exhaust valve 60 under the working pressure, thereby eliminating the air bag, reducing the air resistance and improving the water supply efficiency. When the water column breaks, the air valve is largely charged, and the water column is closed again, the valve core 31 is kept closed by the elastic member 33, and the outlet 21 is sealed by the pressure of the pipe. Meanwhile, the liquid storage member 46 sinks to the bottom of the cylinder 44, temporarily closes the first communication hole 41, fully stores working liquid in the cylinder 44, rises under the buoyancy action of the working liquid, closes the sealing exhaust port 43 under the action of the inner pressure of the pipeline, intercepts a large amount of sucked air, forms a large air bag, absorbs the energy of a water hammer, and buffers or weakens the harm of the water hammer. The micro exhaust valve 60 then slowly exhausts the sucked air under the working pressure, and the normal operation state of the pipeline is restored.

It can be understood that the existing air valve cuts off the instant of closing the water hammer, a large amount of air in the pipeline is discharged by the air valve with small holes, and the effect of buffering or weakening the water hammer hazard by the air bag is greatly reduced. In order to adapt to different working conditions, the valves are required to be opened and closed or adjusted manually, the number of the valves is large, the labor intensity is high, and the change of the working conditions of the pipeline cannot be automatically adapted. Meanwhile, due to the large combined volume, the installation space is limited.

The advantages of the air valve 100 provided by the present invention are as follows:

In the water filling stage of the pipeline, the air valve 100 can exhaust a large amount of air, and after the air exhaust is finished, a full pipe flow is formed, so that the water filling time is shortened; simultaneously, the exhaust gas amount can be automatically and properly controlled, the water filling speed of the pipeline can be restrained, and the air valve is prevented from closing the valve water hammer due to too fast water filling.

In the pipeline emptying stage, the air valve 100 can timely and rapidly intake a large amount of air, and damage such as collapse or falling off of a pipeline lining caused by instability of negative pressure is prevented.

When the power is off, the pump is stopped or the valve is quickly opened and closed, and the water hammer is stopped and closed, the air valve 100 can quickly and timely perform a large amount of air intake, a small amount of air exhaust or a small amount of air exhaust, temporarily collect air near the high-protruding node of the pipeline to form a large-interception air bag, absorb the energy of the water hammer and buffer or weaken the harm of the water hammer.

In the pipeline operation stage, the air valve 100 can continuously discharge trace air precipitated in water under the working pressure, eliminate air bags, reduce air resistance and improve water supply efficiency.

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 illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims

1. The composite air valve is mounted on a pipeline and is characterized by comprising a valve body, a valve cover, a first valve core assembly, a cylinder body assembly, a second valve core assembly and a trace exhaust valve, wherein the valve cover is arranged on the valve body, a valve cavity is formed in the valve body, an inlet connected with the pipeline is formed in one end of the valve body, an outlet is formed in the valve cover, the cylinder body assembly is arranged at the outlet, one end of the cylinder body assembly extends into the valve cavity, and the valve core assembly is sleeved on the cylinder body assembly and can move along the cylinder body assembly so as to open or seal the outlet; the cylinder assembly is provided with a first communication hole, a second communication hole and an exhaust hole which are respectively communicated with the inside of the cylinder assembly, the micro exhaust valve is installed on the cylinder assembly and is communicated with the inside of the cylinder assembly through the second communication hole, the second valve core assembly is contained in the cylinder assembly and is used for opening or sealing the exhaust hole, and the first communication hole is communicated with the valve cavity and the inlet.

2. The composite air valve of claim 1, wherein the canister assembly includes a canister and a canister cover, one end of the canister extends from the outlet into the valve chamber, the other end is mounted to the valve cover, the canister cover is disposed at the other end of the canister, and the micro-exhaust valve is mounted to the canister cover.

3. The composite air valve according to claim 1 or 2, wherein a liquid storage piece is arranged in the cylinder assembly, and the liquid storage piece can drive the second valve core assembly to open or seal the exhaust hole.

4. The composite air valve according to claim 3, wherein the liquid storage part is fixed inside the cylinder assembly and located in the first communication hole, the liquid storage part extends towards the valve cover, a working space for opening or sealing the exhaust hole by a second valve core assembly is formed between the outer wall of the liquid storage part and the inner wall of the cylinder assembly, a channel is formed in the liquid storage part, the channel communicates the first communication hole with the inside of the working space, and the second valve core assembly is sleeved on the outer wall of the liquid storage part.

5. The composite air valve of claim 3, wherein the reservoir is movably disposed within the barrel assembly and is capable of opening or closing the first communication aperture, the second valve core assembly is detachably disposed on the reservoir, and both the second valve core assembly and the reservoir are capable of moving within the barrel assembly.

6. The composite air valve of claim 5 wherein a density of the reservoir is greater than a density of the medium within the conduit.

7. The composite air valve of claim 5, wherein a side of the reservoir adjacent to the first communication hole has an arcuate surface configured to engage an inner wall of a distal end of the first communication hole to effect closure of the first communication hole.

8. The composite air valve of claim 1, wherein the second valve core assembly includes a float member and a first seal member, the first seal member is mounted on the float member for cooperating with the vent hole, the float member has a density less than a density of a medium in the conduit, and the float member is operable to move the first seal member adjacent the vent hole under the influence of air pressure and/or medium buoyancy to seal the vent hole.

9. The composite air valve of claim 1, wherein the first valve core assembly comprises a valve core, a second sealing element and an elastic element, the valve core is sleeved on the cylinder assembly, the second sealing element is installed on one side surface of the valve core, which is close to the inlet, the elastic element is sleeved on the cylinder assembly, one end of the elastic element is abutted against the cylinder assembly, the other end of the elastic element is abutted against the valve core, and the elastic element is used for providing acting force for resetting the valve core.

10. The composite air valve according to claim 1, wherein the micro exhaust valve is provided with a vent hole, and the second communication hole communicates with the atmosphere through the vent hole.