Anti-overflow air valve

Abstract

The invention relates to an anti-overflow air valve to avoid water leakage in the exhaust process of the air valve. The air valve is suitable for the technical field. According to the technical scheme, the anti-overflow air valve comprises a valve body, a valve body cavity is formed in the valve body, an air-water inlet and outlet communicated with the valve body cavity is formed in the lower end of the valve body, and a first ventilation opening communicated with the valve body cavity is formed in the upper end of the valve body; the valve cover is fixed to the upper end of the valve body, a valve cover cavity is formed in the valve cover, at least one air inlet and outlet hole is formed in the side wall of the valve cover, a second air vent is formed in the lower end of the valve cover, and the valve cover cavity is communicated with the valve body cavity through the second air vent and the first air vent; the first floating ball valve is arranged in the valve body cavity and can seal the first air vent when the water level in the valve body cavity is greater than or equal to a preset first water level; and the second floating ball valve is arranged corresponding to the gas-water inlet and outlet of the valve body and can seal part of the gas-water inlet and outlet when the water level below the gas-water inlet and outlet is greater than or equal to a preset second water level.

Description

Technical Field

[0001] The present invention relates to an anti-overflow air valve, which is applicable to the technical field of air valves. Background Art

[0002] Air valves are commonly used in long-distance water conveyance pipelines. During the pipeline filling process, the air valve can discharge the air in the pipeline and accelerate the filling speed; during rapid valve closing or pump power failure, water hammer phenomenon will occur in the pipeline, and air enters the pipeline through the air valve, weakening the water column separation caused by water hammer and slowly exhausting air when the water column closes, reducing the closing water hammer.

[0003] During the filling process or the water column closing process, if the water flow rate is too fast and the water surface rises rapidly, after the air is completely discharged, the floating ball in the air valve is too late to rise, resulting in water overflowing from the air valve before the air valve closes, thus causing an overflow phenomenon. The overflowing water may pollute the surrounding environment and also affect the conveying efficiency of the pipeline system.

[0004] In addition, air valves are also applied to some special application scenarios, such as being combined with a tank to undertake the water hammer protection function. In such scenarios, there are extremely high requirements for the anti-overflow property of the air valve. Therefore, it is necessary to invent an air valve with an anti-overflow structure to avoid water leakage during the air exhaust process of the air valve. Summary of the Invention

[0005] The technical problem to be solved by the present invention is: in view of the above problems, to provide an anti-overflow air valve to avoid water leakage during the air exhaust process of the air valve.

[0006] The technical solution adopted by the present invention is: an anti-overflow air valve, characterized by comprising: A valve body, which has a valve body chamber inside, has a gas-water inlet and outlet communicating with the valve body chamber at its lower end, and has a first ventilation port communicating with the valve body chamber at its upper end; A valve cover, fixed to the upper end of the valve body, which has a valve cover chamber inside, has at least one air inlet and outlet hole on the side wall of the valve cover, has a second ventilation port at the lower end of the valve cover, and the valve cover chamber communicates with the valve body chamber through the second ventilation port and the first ventilation port; A first floating ball valve, arranged in the valve body chamber, and can close the first ventilation port when the water level in the valve body chamber is greater than or equal to a preset first water level; A second floating ball valve, arranged corresponding to the gas-water inlet and outlet of the valve body, and can close part of the gas-water inlet and outlet when the water level below the gas-water inlet and outlet is greater than or equal to a preset second water level.

[0007] The second floating ball valve includes: The second guiding cylinder has a guiding cylinder body with a diameter smaller than the diameter of the gas-water inlet and outlet, and a transition section connecting the upper end of the guiding cylinder body and the gas-water inlet and outlet. At least one second gas-water inlet and outlet hole is provided on the guiding cylinder body and the transition section; The second floating ball is arranged inside the guiding cylinder body, and the diameter of the second floating ball is adapted to the inner diameter of the guiding cylinder body; The second limiting ring is arranged at the upper end of the inner wall of the guiding cylinder body and can cooperate with the second floating ball to close the upper opening of the guiding cylinder body.

[0008] The second guiding cylinder is made of a mesh structure formed by wire braiding and welding.

[0009] The first floating ball valve includes: The first guiding cylinder has an inner diameter adapted to the first ventilation port, and its upper end is connected to the first ventilation port. At least one first gas-water inlet and outlet hole is provided on the side wall of the first guiding cylinder; The first floating ball is arranged inside the first guiding cylinder, and the diameter of the first floating ball is adapted to the inner diameter of the first guiding cylinder; The first limiting ring is arranged at the upper end of the inner wall of the first guiding cylinder and can cooperate with the first floating ball to close the first ventilation port.

[0010] The rising stroke of the first floating ball in the first floating ball valve is greater than the rising stroke of the second floating ball in the second floating ball valve; The second floating ball is equipped with a rising synchronization mechanism, which can drive the first floating ball in the first floating ball valve to rise when the second floating ball rises.

[0011] The rising synchronization mechanism includes: The bracket is located inside the first floating ball valve and below the first floating ball; The second guide rod has its lower end connected to the second floating ball in the second floating ball valve, and its upper end passes through the guiding hole on the first floating ball valve and is then connected to the bracket inside the first floating ball valve.

[0012] The first floating ball valve is provided with a micro exhaust mechanism, which can provide a micro exhaust channel for the valve body chamber after the first floating ball valve closes the first ventilation port.

[0013] The micro exhaust mechanism includes: The spherical cover is arranged inside the first floating ball valve, above the first floating ball, and can cooperate with the first limiting ring inside the first floating ball valve to achieve sealing; The first guide rod has its lower end connected to the upper end face of the spherical cover, and its upper end passes through the guiding hole on the valve cover and then exposes outside the valve cover; A micro exhaust hole communicating the upper and lower end faces is provided at the central position of the spherical cover.

[0014] A displacement sensor and a first medium sensor are provided in the valve cover chamber. The displacement sensor is located above the first float valve and is used to collect the displacement information of the first float ball in the first float valve. The first medium sensor is used to collect the medium information in the valve cover chamber. A second medium sensor is provided in the valve body chamber, and this second medium sensor is used to collect the medium information in the valve body chamber.

[0015] A pressure sensor is provided in the valve body chamber.

[0016] The beneficial effects of the present invention are as follows: By providing a second float valve at the air-water inlet and outlet of the valve body, the second float valve can close part of the air-water inlet and outlet when the water level below the air-water inlet and outlet is greater than or equal to the preset second water level, thereby reducing the water flow rate entering the valve body and decreasing the rising speed of the water level in the valve body, so as to avoid the phenomenon that the water overflows the air valve before the air valve closes due to the too-fast rising of the water level and the float ball not having enough time to rise.

[0017] In the present invention, the second float ball below the valve body increases the impedance of the air-water inlet and outlet of the air valve. When the pipeline is filled with water, air is discharged from the air valve, and the resistance increases when passing through the float ball, increasing the back pressure during pipeline water filling, reducing the pipeline water filling speed, and enhancing the safety of the water filling process.

[0018] In the present invention, through the rising synchronization mechanism, when the second float ball below rises, it drives the first float ball in the first float valve above to rise synchronously, reducing the closing stroke of the first float ball in the valve body, enabling the air valve to close quickly, and effectively preventing the water from overflowing the air valve.

[0019] In the present invention, the side wall height of the first guide cylinder and the size and quantity of the first air inlet and outlet holes are based on meeting the flow requirements of air intake and exhaust of the air valve under different working conditions. The side wall height of the first guide cylinder corresponds to the closing stroke (rising stroke) of the first float ball. In the present invention, through the cooperation of the rising synchronization mechanism and the second float ball, the closing stroke of the first float ball can be reduced in advance when the water level rises, so as to achieve quick closing on the premise of meeting the air intake and exhaust flow requirements of the air valve and prevent the water from overflowing the air valve.

[0020] In the present invention, through the bracket and the second guide rod, when the second float ball rises with the water surface, it drives the first float ball in the first float valve above to rise synchronously. After the second float ball rises to the highest point of its rising stroke, the first float ball still has a certain stroke margin, and the air valve is not completely closed, allowing the air in the valve to overflow, avoiding leaving a large amount of gas in the valve body.

[0021] In the present invention, a spherical cover is arranged above the first floating ball. The spherical cover can cooperate with the first limiting ring to close the first ventilation port. After the first floating ball floats to the highest point of its stroke, under the action of its own buoyancy, the spherical cover is pressed onto the first limiting ring. When a small amount of gas in the valve body accumulates above the first floating ball to a certain extent, it can overcome the buoyancy of the first floating ball and enter the space between the first floating ball and the spherical cover, and then be discharged through the micro exhaust holes on the spherical cover.

[0022] In the present invention, the working state of the air valve is judged in real time by combining the displacement information of the first floating ball collected by the displacement sensor with the medium information collected by the first and second medium sensors. For abnormal states, the controller will give an alarm, which helps users to carry out timely maintenance or replacement.

[0023] In the present invention, the pressure information in the valve body is collected by the pressure sensor, so that an alarm can be issued after the pressure information exceeds the preset value. Description of the Drawings

[0024] Figure 1 It is a schematic structural diagram of the embodiment.

[0025] Description of the reference numerals: 1 valve body; 2 valve cover; 3 first guide rod; 4 first limiting ring; 5 micro exhaust holes; 6 spherical cover; 7 first floating ball; 8 first guiding cylinder; 9 bracket; 10 second guide rod; 11 second floating ball; 12 second limiting ring; 13 second guiding cylinder; 14 displacement sensor; 15 first medium sensor; 16 second medium sensor; 17 pressure sensor. Detailed Description of the Embodiment

[0026] In order to better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the drawings.

[0027] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0028] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0029] It should be noted that the orientation terms such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described from the angles shown in the drawings and should not be construed as limitations on the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that one component is connected "above" or "below" another component, it can not only be directly connected "above" or "below" another component, but also be indirectly connected "above" or "below" another component through an intermediate component.

[0030] Embodiment 1: This embodiment is an anti-overflow air valve, including: a valve body 1, a valve cover 2, a first float valve, a second float valve, etc.

[0031] In this example, the valve body 1 has a valve body chamber inside, and a gas-water inlet and outlet communicating with the valve body chamber is provided at the central position of its lower end, and a first ventilation port communicating with the valve body chamber is provided at the central position of its upper end.

[0032] In this embodiment, the valve cover 2 has a valve cover chamber inside, and a plurality of air inlet and outlet holes communicating with the valve cover chamber are evenly distributed on the side wall of the valve cover 2, and a second ventilation port communicating with the valve cover chamber is provided at the central position of the lower end of the valve cover 2.

[0033] In this example, the valve cover 2 can be fixed to the upper end of the valve body 1 by bolts, and a sealing gasket is provided between the valve cover 2 and the valve body 1. And when the valve cover 2 is fixed on the valve body 1, the valve cover chamber in the valve cover 2 communicates with the valve body chamber in the valve body 1 through the second ventilation port and the first ventilation port.

[0034] In this embodiment, the first float valve is arranged in the valve body chamber of the valve body 1 and corresponds to the first ventilation port of the valve body 1. The first float valve can close the first ventilation port of the valve body 1 when the water level in the valve body chamber is greater than or equal to a preset first water level.

[0035] In this embodiment, the second float valve corresponds to the gas-water inlet and outlet of the valve body 1. The second float valve can close part of the gas-water inlet and outlet when the water level below the gas-water inlet and outlet is greater than or equal to a preset second water level.

[0036] The working principle of the anti-overflow air valve in this embodiment is as follows: 1. When the water conveyance pipeline or the tank is filled with water, the air valve is in an open state and exhausts a large amount of air. At this time, the air passes through the second float valve and enters the valve body 1, then passes through the first float valve and enters the valve cover 2, and finally is discharged into the atmosphere.

[0037] 2. When the water in the water conveyance pipeline or the tank rises to the height where the second float ball 11 in the second float valve is located, the second float ball 11 rises under the buoyancy of the water until it rises to the preset second water level, and then the second float valve closes part of the gas-water inlet and outlet.

[0038] When the water level continues to rise, water enters the air valve body 1 through the unclosed part of the air-water inlet and outlet. The first float ball 7 in the first float valve rises under the buoyancy of the water and finally closes the air valve, preventing the water flow from overflowing the air valve.

[0039] 3. In accident conditions such as when the water pump power is cut off, negative pressure appears in the water conveyance pipeline or the tank. The water level in the air valve drops, and the first float ball 7 in the first float valve and the second float ball 11 in the second float valve fall successively. A large amount of air enters the air valve, suppressing water hammer separation. When the water column closes, the second float ball 11 and the first float ball 7 float up successively, quickly closing the air valve to prevent the water flow from overflowing.

[0040] Embodiment 2: This embodiment is a further improvement based on Embodiment 1. In this example, the first float valve includes a first guide cylinder 8, a first float ball 7, a first limit ring 4, etc.

[0041] In this example, the inner diameter of the first guide cylinder 8 is adapted to the first ventilation port, and its upper end is connected to the first ventilation port. A number of first air-water inlet and outlet holes are evenly distributed on the side wall of the first guide cylinder.

[0042] In this embodiment, the first float ball 7 is arranged in the first guide cylinder 8. The diameter of the first float ball is adapted to the inner diameter of the first guide cylinder 8 and can move up and down in the first guide cylinder 8.

[0043] In this example, the first limit ring 4 is arranged at the second ventilation port at the upper end of the inner wall of the first guide cylinder 8. When the first float ball 7 rises to contact it, the first limit ring 4 can cooperate with the first float ball 7 to block the first ventilation port.

[0044] In this embodiment, no hole is opened at the bottom of the first guide cylinder 8 to prevent the air from blowing up the first float ball 7 when a large amount of air enters.

[0045] In this embodiment, the second float valve includes a second guide cylinder 13, a second float ball 11, a second limit ring 12, etc. The second guide cylinder 13 is divided into a guide cylinder main body and a transition section located at the upper end of the guide cylinder main body.

[0046] In this example, the diameter of the guide cylinder main body is smaller than the diameter of the air-water inlet and outlet of the valve body 1; the lower end of the transition section is connected to the upper end of the guide cylinder main body, and the upper end of the transition section is connected to the air-water inlet and outlet of the valve body 1. The diameter of the transition section gradually increases from the lower end to the upper end, increasing from being adapted to the guide cylinder main body to being adapted to the air-water inlet and outlet.

[0047] In this embodiment, a number of second air-water inlet and outlet holes are evenly distributed on the guide cylinder main body and the transition section. In some embodiments, the second guide cylinder 13 is a mesh structure woven and welded by steel wires, and the mesh holes on it are used as the second air-water inlet and outlet holes in this example. Water and air can freely enter and exit the second guide cylinder 13, and floating objects and other sundries in the water are intercepted and cannot enter the air valve.

[0048] In this example, the second floating ball 11 is arranged inside the guiding cylinder main body. The diameter of the second floating ball 11 is adapted to the inner diameter of the guiding cylinder main body, and it can move up and down inside the guiding cylinder main body.

[0049] In this embodiment, the second limiting ring 12 is arranged at the upper end of the inner wall of the guiding cylinder main body. When the second floating ball 11 rises to contact with it, the second limiting ring 12 can cooperate with the second floating ball 11 to block the upper opening of the guiding cylinder main body, thereby closing part of the air-water inlet and outlet. At this time, air and water can enter and exit the valve body 1 through the second air-water inlet and outlet holes on the transition section.

[0050] The working principle of this embodiment is as follows: 1. When the water conveyance pipeline or the tank is filled with water, the air valve is in the open state and exhausts a large amount of air. At this time, the air passes through the second guiding cylinder 13 into the valve body 1, then passes through the first guiding cylinder 8 into the valve cover 2, and finally is discharged into the atmosphere. Since the density of air is relatively low, the buoyancy acting on the second floating ball 11 is not sufficient to blow up the two floating balls, and the air valve remains in the fully open state during the exhaust process.

[0051] 2. When the water in the water conveyance pipeline or the tank rises to the height where the second floating ball 11 is located, the second floating ball 11 rises under the buoyancy of the water until it rises to the preset second water level, and then the second floating ball valve closes part of the air-water inlet and outlet.

[0052] When the water level continues to rise, the water enters the air valve through the unclosed part of the air-water inlet and outlet, enters the first guiding cylinder 8 through the holes on the side wall of the first guiding cylinder 8, and the first floating ball 7 rises under the buoyancy of the water and finally closes the air valve, preventing the water from overflowing the air valve.

[0053] 3. Under accident conditions such as when the water pump loses power, a negative pressure appears in the water conveyance pipeline or the tank. The water level in the air valve drops, and the first floating ball 7 and the second floating ball 11 fall successively. The air valve intakes a large amount of air to inhibit water hammer separation. When the water column closes, the second floating ball 11 and the first floating ball 7 float up successively to quickly close the air valve and prevent the water from overflowing.

[0054] Embodiment 3: This embodiment is a further improvement based on Embodiment 2. In this example, a rising synchronization mechanism is installed on the second floating ball 11, and this rising synchronization mechanism can drive the first floating ball 7 in the first floating ball valve to rise synchronously when the second floating ball 11 rises.

[0055] In this embodiment, the rising synchronization mechanism includes a bracket 9 and a second guide rod 10. The bracket 9 is located inside the first guiding cylinder 8 and below the first floating ball 7. The second guide rod 10 is arranged vertically. The lower end of the second guide rod 10 is fixed to the second floating ball 11 inside the second floating ball valve, and the upper end of the second guide rod 10 passes through the guiding hole at the bottom of the first guiding cylinder 8 and then connects to the bracket 9 inside the first guiding cylinder 8.

[0056] In this embodiment, the rising stroke of the first floating ball 7 in the first floating ball valve is greater than the rising stroke of the second floating ball 11 in the second floating ball valve. The rising stroke of the first floating ball 7 is 4H, and the rising stroke of the second floating ball 11 is 3H. When the second floating ball 11 is at the lowest point of its rising stroke (the bottom of the second guide cylinder 13), the first floating ball 7 is at the lowest point of its rising stroke (the bottom of the first guide cylinder 8); when the second floating ball 11 rises with the water level, it drives the first floating ball 7 to rise synchronously through the second guide rod 10 and the bracket 9; when the second floating ball 11 is at the highest point of its rising stroke (the second limit ring 12), the first floating ball 7 is at a position H below the first limit ring 4, that is, the floating-up stroke of the first floating ball 7 is shortened to 1 / 4 of the original.

[0057] The working principle of this embodiment is as follows: 1. When the water pipeline or the tank is filled with water, the air valve is in the open state and exhausts a large amount of air. At this time, the air passes through the second guide cylinder 13 into the valve body 1, then passes through the first guide cylinder 8 into the valve cover 2, and finally is discharged into the atmosphere. Due to the low density of air, the buoyancy acting on the second floating ball 11 is not sufficient to blow up the two floating balls, and the air valve remains in the fully open state during the exhaust process.

[0058] 2. When the water in the water pipeline or the tank rises to the height where the second floating ball 11 is located, the second floating ball 11 rises under the buoyancy of the water and simultaneously pushes the first floating ball 7 to rise. Since the stroke of the second floating ball 11 is smaller than that of the first floating ball 7, when the second floating ball 11 rises to the second limit ring 12, the first floating ball 7 still has 1 / 4 of its stroke remaining and does not contact the first limit ring 4. The air valve is not completely closed but remains in a small opening state, and air can still overflow from the air valve.

[0059] When the water level continues to rise, the water enters the air valve through the unclosed part of the air-water inlet and outlet, enters the first guide cylinder 8 through the holes on the side wall of the first guide cylinder 8, and the first floating ball 7 rises under the buoyancy of the water and finally closes the air valve, and the water flow cannot overflow from the air valve.

[0060] 3. Under accident conditions such as when the water pump is powered off, a negative pressure appears in the water pipeline or the tank. The water level in the air valve drops, and the first floating ball 7 and the second floating ball 11 fall successively. The air valve intakes a large amount of air to inhibit water hammer separation. When the water column closes, the second floating ball 11 and the first floating ball 7 float up successively to quickly close the air valve and prevent the water flow from overflowing.

[0061] Embodiment 4: This embodiment is a further improvement based on Embodiment 3. In this example, the first floating ball valve is provided with a micro-exhaust mechanism, and this micro-exhaust mechanism can provide a micro-exhaust channel for the valve body chamber after the first floating ball valve closes the first ventilation port.

[0062] In this example, the micro-exhaust mechanism includes a spherical cover 6 and a first guide rod 3. The spherical cover 6 is arranged inside the first guide cylinder 8, above the first floating ball 7. The size and shape of the spherical cover 6 are adapted to the first floating ball 7 below it and can cover the first floating ball 7. A micro-exhaust hole 5 communicating the upper and lower end faces is provided at the center position of the spherical cover 6. The first guide rod 3 is vertically arranged, with its lower end connected to the center of the upper end face of the spherical cover 6, and its upper end passing through the guide hole on the top surface of the valve cover 2 and exposing outside the valve cover 2.

[0063] The working principle of this embodiment is as follows: 1. When the water pipeline or the tank is filled with water, the air valve is in the open state and exhausts a large amount of air. At this time, the air passes through the second guide cylinder 13 into the valve body 1, then passes through the first guide cylinder 8 into the valve cover 2, and finally is discharged into the atmosphere. Due to the low density of air, the buoyancy acting on the second floating ball 11 is not sufficient to blow up the two floating balls, and the air valve remains in the fully open state during the exhaust process.

[0064] 2. When the water in the water pipeline or the tank rises to the height where the second floating ball 11 is located, the second floating ball 11 rises under the buoyancy of the water, and at the same time pushes the first floating ball 7 to rise. Since the stroke of the second floating ball 11 is less than that of the first floating ball 7, when the second floating ball 11 rises to the second limit ring 12, the first floating ball 7 still has 1 / 4 of the stroke remaining and does not contact the first limit ring 4. The air valve is not fully closed but remains in a small opening state, and air can still overflow from the air valve.

[0065] When the water level continues to rise, the water enters the air valve through the unclosed part of the air-water inlet and outlet, enters the first guide cylinder 8 through the hole on the side wall of the first guide cylinder 8. The first floating ball 7 rises under the buoyancy of the water, drives the spherical cover 6 to rise, and finally presses the spherical cover 6 on the first limit ring 4 to close the air valve, and the water flow cannot overflow from the air valve.

[0066] If there is still a small amount of gas that fails to be discharged in time before the air valve is closed, it can be discharged through the micro-exhaust hole 5 on the spherical cover 6. At this time, there is a distance between the first floating ball 7 and the second floating ball 11. Therefore, after a small amount of gas accumulates, it only needs to overcome the buoyancy of the first floating ball 7 to enter the space between the first floating ball 7 and the spherical cover 6, and then enter the valve cover 2 through the micro-exhaust hole 5 and be discharged.

[0067] 3. Under accident conditions such as power failure of the water pump, negative pressure appears in the water pipeline or the tank. The water level in the air valve drops, and the first floating ball 7 and the second floating ball 11 fall successively. The air valve intakes a large amount of air to inhibit water hammer separation. When the water column closes, the second floating ball 11 and the first floating ball 7 float successively to quickly close the air valve and prevent the water flow from overflowing.

[0068] Example 5: This example is a further improvement based on Example 1, 2, 3 or 4. In this example, a displacement sensor 14 and a first medium sensor 15 are provided in the valve cover chamber. The displacement sensor 14 is located above the first float valve and is used to collect the displacement information of the first float ball 7 in the first float valve (if there is a spherical cover 6 above the first float ball 7, collect the displacement information of the spherical cover 6); the first medium sensor 15 is used to collect the medium information in the valve cover chamber (the medium is water or air).

[0069] In this example, a second medium sensor 16 and a pressure sensor 17 are provided in the valve body chamber. The second medium sensor 16 is used to collect the medium information in the valve body chamber; the pressure sensor 17 collects the pressure information in the valve body chamber.

[0070] In this example, the displacement sensor 14 can detect the displacement of the first float ball 7 or the spherical cover 6. In some embodiments, its output is a digital signal. When the first float ball 7 or the spherical cover 6 reaches the upper limit position, the displacement sensor 14 measures the state of the air valve as closed; when the first float ball 7 or the spherical cover 6 does not reach the upper limit position, the displacement sensor 14 measures the state of the air valve as open. In some other embodiments, the output of the displacement sensor 14 can also be an analog signal, which can more accurately reflect the opening degree of the air valve.

[0071] In this example, the controller uses the data information of the displacement sensor 14, the first and second medium sensors, and the pressure sensor 17, and monitors and warns the working state of the air valve based on the data information. For abnormal states, the controller will alarm to remind the user to repair or replace the air valve.

[0072] When the displacement sensor 14 detects that the air valve is in the open state, if the media detected by the first and second medium sensors are both air, the state of the air valve is normal; if the media detected by the first and second medium sensors are both water, it indicates that there is a serious water leakage phenomenon in the air valve.

[0073] When the displacement sensor 14 detects that the air valve is in the closed state, if the media detected by the first and second sensors are air and water respectively, the state of the air valve is normal; if the media detected by the first and second sensors are both water, it indicates that there is a water leakage phenomenon in the air valve; if the media detected by the first and second sensors are both air, it indicates that the air valve closes in advance and there is still air not exhausted in the valve body 1.

Claims

1. An anti-overflow air valve, characterized in that: include: A valve body (1) having a valve body chamber inside, a lower end thereof having an air and water inlet and outlet communicating with the valve body chamber, and an upper end thereof having a first vent communicating with the valve body chamber; A valve cover (2) is fixed to the upper end of the valve body (1), the valve cover has a valve cover chamber inside, at least one air inlet and outlet hole is provided on the side wall of the valve cover (2), the lower end of the valve cover (2) has a second air vent, and the valve cover chamber is connected to the valve body chamber via the second air vent and the first air vent; a first float valve, disposed in the valve body chamber, capable of closing the first vent when the water level in the valve body chamber is greater than or equal to a preset first water level; The second float valve is arranged corresponding to the gas and water inlet and outlet of the valve body (1), and can close part of the gas and water inlet and outlet when the water level below the gas and water inlet and outlet is greater than or equal to a preset second water level.

2. The anti-overflow air valve according to claim 1, characterized in that: The second float valve comprises: The second guide cylinder (13) comprises a guide cylinder body having a diameter smaller than that of the gas-water inlet and outlet, and a transition section connecting the upper end of the guide cylinder body and the gas-water inlet and outlet, wherein at least one second gas-water inlet and outlet hole is provided on the guide cylinder body and the transition section; A second floating ball (11) is arranged in the guide tube body, and the diameter of the second floating ball is adapted to the inner diameter of the guide tube body; The second limiting ring (12) is arranged on the upper end of the inner wall of the guide tube body and can cooperate with the second floating ball (11) to close the upper end opening of the guide tube body.

3. The anti-overflow air valve according to claim 2, characterized in that: The second guide cylinder (13) is made of a mesh structure formed by braiding and welding steel wires.

4. The anti-overflow air valve according to claim 1, characterized in that: The first float valve comprises: A first guide cylinder (8) having an inner diameter adapted to the first vent and an upper end connected to the first vent, and at least one first air and water inlet and outlet hole is provided on a side wall of the first guide cylinder; A first floating ball (7) is arranged in the first guide cylinder (8), and the diameter of the first floating ball is adapted to the inner diameter of the first guide cylinder (8); The first limiting ring (4) is arranged at the upper end of the inner wall of the first guide cylinder (8) and can cooperate with the first floating ball (7) to close the first vent.

5. The anti-overflow air valve according to claim 1, characterized in that: The rising stroke of the first float ball (7) in the first float ball valve is greater than the rising stroke of the second float ball (11) in the second float ball valve; The second float (11) is provided with a rising synchronization mechanism, which can drive the first float (7) in the first float valve to rise when the second float (11) rises.

6. The anti-overflow air valve according to claim 5, characterized in that: The ascending synchronization mechanism comprises: A bracket (9) is located inside the first float valve and below the first float (7); A second guide rod (10) has a lower end connected to a second float ball (11) in the second float ball valve, and an upper end connected to a bracket (9) in the first float ball valve after passing through a guide hole in the first float ball valve.

7. The anti-overflow air valve according to claim 1, characterized in that: The first float valve is provided with a micro-exhaust mechanism, which can provide a micro-exhaust channel for the valve body chamber after the first float valve closes the first vent.

8. The anti-overflow air valve according to claim 7, characterized in that: The micro-exhaust mechanism comprises: A spherical cover (6) is arranged in the first float valve, is located above the first float (7), and can cooperate with the first limit ring (4) in the first float valve to achieve sealing; A first guide rod (3), the lower end of which is connected to the upper end surface of the spherical cover (6), and the upper end of which passes through the guide hole on the valve cover (2) and is exposed outside the valve cover (2); A micro-exhaust hole (5) communicating with the upper and lower end surfaces of the spherical cover (6) is provided at the center thereof.

9. The anti-overflow air valve according to claim 1, characterized in that: A displacement sensor (14) and a first medium sensor (15) are provided in the valve cover chamber, wherein the displacement sensor (14) is located above the first float valve and is used to collect displacement information of a first float ball (7) in the first float valve; and the first medium sensor (15) is used to collect medium information in the valve cover chamber; A second medium sensor (16) is provided in the valve body cavity, and the second medium sensor is used to collect medium information in the valve body cavity.

10. The anti-overflow air valve according to claim 1 or 9, characterized in that: A pressure sensor (17) is provided in the valve body cavity.

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