An air valve valve train

Abstract

The present application provides an air valve valve group, installed on the infusion pipeline, comprising a negative pressure suction valve, a trace exhaust valve for trace exhaust, a high-speed limited exhaust valve for fast limited exhaust, and an electronic switch valve. The valve group can not only realize the purpose of exhaust when the air pipe is filled with water, but also has the function of preventing water hammer. The water hammer protection measures adopted are simple and efficient, and the degree of automation is high, and the cost is correspondingly reduced.

Description

Technical Field

[0001] This invention relates to the field of pipeline water supply technology, and specifically to an air valve assembly. Background Technology

[0002] According to the pump station standard GB50265-2022, the water flow rate during empty pipe filling should be controlled between 0.3 and 0.5 m / s. We believe that choosing the minimum value is the safest option, so we selected 0.3 m / s, or even less than 0.2 m / s.

[0003] Assuming a pipe with a diameter of 1m, a water filling length of approximately 300m, and an air volume of 235m³ inside the pipe, the water filling time is approximately 300 / 0.3≈1000s. Therefore, the air volume flow rate of the vent valve is Qa=235m³ / 1000s=0.235m³ / s.

[0004] The best way to control the water filling rate is to use the damping generated by the air to reduce the water filling rate of the empty pipe. The best way to generate damping by the air is to limit the venting volume of the vent valve. Therefore, the venting orifice of the vent valve should not be too large when filling the empty pipe. Otherwise, if the venting is too fast, the air will become too thin and lose its damping effect on the water column. Of course, it should not be too small either, otherwise the water filling time of the empty pipe will be too long, which will lead to excessive production downtime and user complaints.

[0005] According to the formula for calculating the volumetric flow rate at the exhaust orifice (excerpted from Fluid Transient In System): Where C0 is the orifice flow coefficient, ranging from 0.5 to 0.8, typically taken as 0.62, and A0 is the orifice area = 0.7854 × DN. 2 Given R=287, T=288.15, water pressure difference ΔP=34.5kPa, and compression ratio Pr=(Pa+ΔP) / Pa=1.341 (Pr is atmospheric pressure, approximately 101.33kPa), the following equation is derived based on the exhaust volume flow rate obtained above: 0.235 = 0.62 × 0.7854 × DN 2 × Solving the equation yields DN = 52.5 mm, so the value is DN50.

[0006] Conclusion: The value is usually taken as 1 / 20 of the supervisor's.

[0007] After the empty pipe is filled with water, the vent should automatically close and then automatically open again when the pipe is filled with water again.

[0008] As early as 1898, scientist Zhukovsky summarized a formula for calculating direct water hammer. Where 'a' is the propagation speed of the water hammer wave in water, and for metal pipes, such as steel pipes, the average propagation speed is 1000 m / s; g is the acceleration due to gravity, which is approximately 9.81 m / s². 2 ,but , The change in flow velocity leads to the conclusion that water hammer is caused by changes in flow velocity; the greater the change in flow velocity, the greater the water hammer. A power outage and pump stoppage creates a pressure drop water hammer, resulting in negative pressure along the pipeline. This negative pressure not only damages the pipe lining but, in severe cases, can cause the pipe to collapse. It can also cause water vaporization and water column separation, potentially leading to severe water hammer formation, which can cause pipe rupture. Therefore, water hammer formation must be controlled. The best method for controlling water hammer formation is to use a large amount of air intake, storing this air in a cavity. When the two water columns merge, only a small amount of air should be released through the air intake port. The air intake port and the empty pipe filling port must remain closed; otherwise, the two water columns will collide at high speed, generating severe water hammer formation.

[0009] In existing conventional air valves, the vent port used for empty pipe filling and the suction port required for drawing air when the system generates negative pressure are the same physical port. This leads to two problems: either the empty pipe filling and venting are too rapid, causing fatal water hammer during empty pipe filling, leading to pipe rupture and preventing the filling process from being completed, causing project delays; or the suction port is too small when the system generates negative pressure, resulting in insufficient air intake and incomplete elimination of negative pressure, posing a serious safety hazard. Therefore, in existing pipeline water supply systems, using traditional air valves can cause pump shutdowns and severe water hammer, posing a serious safety risk. Summary of the Invention

[0010] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide an air valve assembly.

[0011] The technical solution adopted in this invention is as follows: an air valve assembly, installed on an infusion pipeline, includes a negative pressure suction valve, a micro-venting valve for micro-venting, a high-speed limiting venting valve for rapid limiting venting, and an electronic switching valve. The negative pressure intake valve includes a first valve body and a negative pressure intake assembly. The first valve body has a first port, a second port, a third port, and a fourth port. The first port is connected to the infusion line, and the air inlet of the micro-vent valve is connected to the second port. The electronic switching valve includes a fourth valve body. The inner cavity of the fourth valve body includes a control cavity and a first cavity and a second cavity located at both ends of the control cavity and both communicating with the control cavity. The electronic switching valve also includes an opening and closing element located within an opening and closing element and an opening and closing control element that controls the movement of the opening and closing element to open and close the control cavity. The end of the first cavity away from the control cavity is connected to a third port through a connecting pipe, and the end of the second cavity away from the control cavity is connected to the inlet of a high-speed limited exhaust valve. The fourth valve body is also provided with a normally open conduit that connects the second cavity to the connecting pipe. The high-speed limited exhaust valve includes a third valve body, a third valve seat located in the lower inner cavity of the third valve body, a second float ball that mates with the third valve seat, and a detection and control component electrically connected to the opening and closing control element and detecting the position of the second float ball. The upper end of the third valve body is provided with a high-speed limited exhaust port. The second float has a first height position that is in contact with the third valve seat and a second height position that moves upward away from the third valve seat. When the detection and control component detects that the second float is at the first height position, the opening and closing control component opens the flow of the control cavity after a delay. When the detection and control component detects that the second float is at the second height position, the opening and closing control component immediately closes the flow of the control cavity. The negative pressure suction component is located at the fourth port and is used to control the opening and closing of the fourth port. When the external pressure is greater than the internal pressure of the first valve body, the negative pressure suction component opens the fourth port to connect the outside world and the internal cavity of the first valve body. When the external pressure is not greater than the internal pressure of the first valve body, the negative pressure suction component closes the fourth port to disconnect the connection between the outside world and the internal cavity of the first valve body.

[0012] Preferably, the detection and control component includes a first displacement sensor, a second displacement sensor, a first relay, and a second relay. The first relay is connected in series between the first displacement sensor and the opening / closing control component, and the second relay is connected in series between the second displacement sensor and the opening / closing control component. When the second float rises to the second height position, the second displacement sensor is triggered, the second relay is immediately de-energized, and the opening and closing control component immediately shuts off the flow in the control cavity. When the second float descends to the first height position, the first displacement sensor is triggered, the first relay is energized after a delay, and the opening and closing control component opens the flow in the control cavity after a delay.

[0013] Preferably, the negative pressure suction assembly includes a first valve seat, a first valve core, and a first spring. The first valve seat is located within the first valve body near the fourth port. A positioning seat is also fixed within the first valve body. The two ends of the first spring are connected to the first valve core and the positioning seat, respectively. When the pressure on the upper end face of the first valve core is greater than the pressure on its lower end face, the first valve core moves down and compresses the first spring, and the fourth port opens; When the pressure on the upper end face of the first valve core is less than the pressure on its lower end face, the first valve core moves upward under the restoring force of the first spring until it abuts against the first valve seat, and the fourth port is closed.

[0014] Preferably, the negative pressure suction assembly further includes a positioning rod, the positioning seat has a positioning hole that is vertically connected to the positioning rod, the positioning rod is vertically disposed in the first valve body and one end is fixedly connected to the first valve core, the other end passes through the positioning hole to form a sliding fit with it, and the first spring is sleeved on the outside of the positioning rod.

[0015] Preferably, the micro-vent valve includes a second valve body, a first float, a second valve core, a lever assembly, and a second valve seat. The upper end of the second valve body is provided with a micro-vent hole. The second valve seat is located within the second valve body near the micro-vent hole and cooperates with the second valve core. The first float is located within the second valve body and is linked to the lever assembly. The second valve core is fixedly connected to the lever assembly. The first float has a third open position where the second valve core is pulled away from the second valve seat by the lever assembly to open the micro-vent hole, and a fourth closed position where the second valve core is pressed against the second valve seat to close the micro-vent hole.

[0016] Preferably, the third valve seat is integrally formed on the third valve body and its inner circumference has an arc-shaped contact surface that is tangent to the lower edge of the second float.

[0017] The beneficial effects of this invention are as follows: This valve assembly can both vent air when filling empty pipes with water and prevent water hammer, making it safe and reliable. The water hammer protection measures adopted are simple, efficient, and cost-effective. At the same time, the high-speed limited-volume venting valve of this invention can be automatically opened and closed by electronic switching valve, eliminating the need for manual opening or closing on-site, resulting in a high degree of automation. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0019] Figure 1 This is a front view structural diagram of an embodiment of the present invention; Figure 2 This is a schematic diagram of the system of the present invention during the air traffic control phase; Figure 3 A schematic diagram of the system of the present invention during the empty pipe water filling stage; Figure 4A schematic diagram of the system of the present invention during the water filling completion stage; Figure 5 A schematic diagram of the system of the present invention when negative pressure / cavitation occurs in the pipeline; Figure 6 A schematic diagram of the system of the present invention when the pressure rises from the negative pressure position of the pipeline and the water column closes; In the diagram, 1. Negative pressure intake valve; 2. Micro-discharge exhaust valve; 3. High-speed limited discharge valve; 4. Electronic switch valve; 5. Connecting pipe; 11. First valve body; 12. First valve seat; 13. First valve core; 14. First spring; 15. Positioning seat; 16. Positioning rod; 21. Second valve body; 22. First float; 23. Second valve core; 24. Lever assembly; 25. Second valve seat; 31. Third valve body; 32. Second float; 34. Third valve seat; 41. Fourth valve body; 42. 43. Control cavity; 44. First cavity; 45. Second cavity; 46. Opening and closing element; 47. Opening and closing control element; 111. Normally open conduit; 112. First port; 113. Second port; 114. Third port; 151. Fourth port; 211. Positioning hole; 311. Micro exhaust port; 311. High-speed limited exhaust port; 331. First displacement sensor; 332. Second displacement sensor; 333. First relay; 334. Second relay; 341. Arc-shaped contact surface. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0022] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0023] like Figure 1 As shown, this is an air valve assembly according to an embodiment of the present invention, installed on an infusion pipeline, including a negative pressure suction valve 1, a micro-venting valve 2 for micro-venting, a high-speed limiting venting valve 3 for rapid limiting venting, and an electronic switching valve 4. The negative pressure intake valve 1 includes a first valve body 11 and a negative pressure intake assembly. The first valve body 11 has a first port 111, a second port 112, a third port 113, and a fourth port 114. The first port 111 is connected to the infusion pipeline, and the air inlet of the micro-vent valve 2 is connected to the second port 112. The electronic switching valve 4 includes a fourth valve body 41. The inner cavity of the fourth valve body 41 includes a control cavity 42 and a first cavity 43 and a second cavity 44 located at both ends of the control cavity 42 and both communicating with the control cavity 42. The electronic switching valve 4 also includes an opening and closing element 45 located within an opening and closing element 45 and an opening and closing control element 46 that controls the movement of the opening and closing element 45 to realize the opening and closing of the control cavity 42. The end of the first cavity 43 away from the control cavity 42 is connected to a third port 113 through a connecting pipe 5, and the end of the second cavity 44 away from the control cavity 42 is connected to the inlet of the high-speed limited exhaust valve 3. The fourth valve body 41 is also provided with a normally open conduit 47 that connects the second cavity 44 and the connecting pipe 5. The high-speed limited exhaust valve 3 includes a third valve body 31, a third valve seat 34 located in the lower inner cavity of the third valve body 31, a second float 32 that cooperates with the third valve seat 34, and a detection and control component electrically connected to the opening and closing control component 46 and detecting the position of the second float 32. The upper end of the third valve body 31 is provided with a high-speed limited exhaust port 311. The second float 32 floats and rises and falls, having a first height position that is in contact with the third valve seat 34 and a second height position that moves upward away from the third valve seat 34. When the detection and control component detects that the second float 32 is at the first height position, the opening and closing control component 46 opens the flow of the control cavity 42 after a delay. When the detection and control component detects that the second float 32 is at the second height position, the opening and closing control component 46 immediately closes the flow of the control cavity 42. The negative pressure suction component is located at the fourth port 4 and is used to control the opening and closing of the fourth port 114. When the external pressure is greater than the internal pressure of the first valve body 11, the negative pressure suction component opens the fourth port 114 to connect the outside world and the inner cavity of the first valve body 11. When the external pressure is not greater than the internal pressure of the first valve body 11, the negative pressure suction component closes the fourth port 114 to disconnect the connection between the outside world and the inner cavity of the first valve body 11.

[0024] like Figure 2 The diagram shows the system in the empty pipe stage, with the second float naturally sinking to the first height position, and the opening and closing control element opening the flow in the control cavity.

[0025] like Figure 3The diagram shows the system entering the empty pipe filling stage. Air in the pipe is discharged through the high-speed limiting vent hole via the inner cavity of the first valve body, the connecting pipe, the inner cavity of the fourth valve body, and the inner cavity of the third valve body. The diameter of the high-speed limiting vent hole is limited to 1 / 20 of the pipe diameter. The air in the pipe creates resistance to the water column, causing it to move slowly, thereby controlling the water flow rate to 0.3 m / s or less, achieving the purpose of safe filling. During the entire high-speed limiting venting process, a negative pressure is formed between the second float and the third valve seat, keeping the second float at the first height position and in a floating state. Figure 4 As shown, after the water filling is completed, the second float rises under the buoyancy of the water. When the second float rises to the second height position, the opening and closing control component immediately shuts off the flow in the control cavity.

[0026] When the system is in the pipeline venting state, the water in the second chamber frequently enters the connecting pipeline through the conduit, and is discharged into the infusion pipeline through the body cavity of the first valve. The second float then sinks to the first height position, and the electronic switch valve opens after a delay. The delay time is adjustable, but must be greater than 10 times the water hammer phase (the water hammer phase refers to the time it takes for the water hammer wave to propagate from the starting end to the end and then reflect back from the end to the starting end). Taking a 10km long water pipeline as an example, one water hammer phase is usually 20s, and 10 times the water hammer phase is 200s. Therefore, the delay time should be greater than 200s. After the delay, the opening and closing control component opens the connection of the control chamber, and the high-speed limited exhaust valve is ready to perform high-speed limited exhaust again.

[0027] like Figure 5 As shown, when the control chamber is closed and the water pump suddenly loses power and stops, the pressure drop wave will cause severe negative pressure along the infusion pipeline, especially at a certain local high point, creating a large cavitation. Therefore, this device is usually installed at a local high point. At this time, the negative pressure suction component opens the fourth port, and a large amount of air enters the infusion pipeline, disrupting the negative pressure. When the internal and external pressures are balanced, the negative pressure suction component closes the fourth port. At the same time, the water in the second chamber is discharged into the cavity of the infusion pipeline through the normally open conduit, the first chamber, and the first valve body. The second float then sinks to the first height position. The opening and closing control component opens after a delay (specifically one hour in this embodiment). During the delay, the first and second chambers cannot be connected through the control chamber. At this time, as Figure 6 As shown, as the pressure in the infusion line rises from the negative pressure position, the two separate water jets can only slowly converge at the second port with a small amount of vented gas due to the closure of the fourth port and control chamber, thus eliminating water hammer. Figure 4 As shown, after the cavity is filled with water, the water enters the third valve body through the control pipe and the normally open conduit. The second float rises again to the second height position under the action of buoyancy. The opening and closing control component immediately closes the control chamber, and the high-speed limited exhaust valve is in the non-exhausting state.

[0028] With this setup, the valve assembly can both vent air when the pipe is filled with water and prevent water hammer. It is safe and reliable, and the water hammer protection measures are simple and efficient. It is not only highly automated, but also reduces costs accordingly.

[0029] Multiple micro-vent valves can be installed as needed, and the air inlet of each micro-vent valve is connected to the second port via a connecting pipe. In this embodiment, only one is installed.

[0030] In this embodiment, the opening and closing element is specifically a sphere, and the control cavity is specifically a spherical cavity adapted to its shape. The opening and closing control element realizes the opening and closing of the control cavity by controlling the rotation of the sphere.

[0031] The diameter of the normally patented catheter is specifically set to 1 / 2", that is, 15mm.

[0032] The detection and control component includes a first displacement sensor 331, a second displacement sensor 332, a first relay 333, and a second relay 334. The first relay 333 is connected in series between the first displacement sensor 331 and the opening / closing control element 46, and the second relay 334 is connected in series between the second displacement sensor 332 and the opening / closing control element 46. When the second float 32 rises to the second height position, the second displacement sensor 332 is triggered, the second relay 334 is immediately de-energized, and the opening and closing control component 46 immediately shuts off the flow in the control cavity 42; When the second float 32 descends to the first height position, the first displacement sensor 331 is triggered, the first relay 333 is energized after a delay, and the opening and closing control component 46 opens the flow of the control cavity 42 after a delay.

[0033] This design further simplifies the structure of the device while ensuring high stability. In this embodiment, the first and second displacement sensors are specifically non-contact sensors.

[0034] The negative pressure suction assembly includes a first valve seat 12, a first valve core 13, and a first spring 14. The first valve seat 12 is located inside the first valve body 11 near the fourth port 114. A positioning seat 15 is also fixed inside the first valve body 11. The two ends of the first spring 14 are connected to the first valve core 13 and the positioning seat 15, respectively. When the pressure on the upper end face of the first valve core 13 is greater than the pressure on its lower end face, the first valve core 13 moves down and compresses the first spring 14, and the fourth port 114 opens. When the pressure on the upper end face of the first valve core 13 is less than the pressure on its lower end face, the first valve core 13 moves upward under the restoring force of the first spring 14 until it abuts against the first valve seat 12, and the fourth port 114 is closed.

[0035] The negative pressure suction assembly also includes a positioning rod 16. The positioning seat 15 has a positioning hole 151 that is adapted to the shape of the positioning rod 16. The positioning rod 16 is vertically arranged inside the first valve body 11 and one end of it is fixedly connected to the first valve core 13. The other end of it passes through the positioning hole 151 and forms a sliding fit with it. The first spring 14 is sleeved on the outside of the positioning rod 16.

[0036] The micro-vent valve 2 includes a second valve body 21, a first float 22, a second valve core 23, a lever assembly 24, and a second valve seat 25. The second valve body 21 has a micro-vent hole 211 at its upper end. The second valve seat 25 is located inside the second valve body 21 near the micro-vent hole 211 and cooperates with the second valve core 23. The first float 22 is located inside the second valve body 21 and is linked to the lever assembly 24. The second valve core 23 is fixedly connected to the lever assembly 24. The first float 22 floats in a third open position where the second valve core 23 is pulled away from the second valve seat 25 by the lever assembly 24 to open the micro exhaust port 211, and a fourth closed position where the second valve core 23 is pressed against the second valve seat 25 to close the micro exhaust port 211.

[0037] like Figure 2 As shown, when the system is in the empty pipe stage, the second valve body is filled with air. At this time, the first float falls due to its own weight and pulls the second valve core away from the micro-vent hole through the lever assembly. The micro-vent hole is in the open state, as shown. Figure 3 As shown, when the pipeline is filled with water, the air inside the pipeline enters the second valve body under the push of the water and is discharged outside the valve through the opened micro-vent hole; as the air is discharged, water enters the second valve body, and the buoyancy of the water causes the first float to rise. The first float gradually pushes the second valve core towards the second valve seat through the lever assembly; when the air inside the second valve body is completely discharged and filled with water, as shown... Figure 4 As shown, the first float rises to its highest position under the buoyancy of the water. At this point, the lever assembly presses the second valve core tightly into the second valve seat, blocking the micro-vent. During system operation, gases dissolved in the water gradually precipitate due to temperature and pressure changes, or accumulate at local high points. These trace amounts of gas enter the top of the second valve body, causing a slight drop in the water level within the second valve body. The first float then descends a short distance. This descent of the first float, through the lever assembly, causes the second valve core to slightly move away from the second valve seat, opening a tiny gap. Under system pressure, the accumulated gas is slowly and in small amounts discharged through this gap. After the gas is discharged, the water level rises again, and the first float rises once more, closing the micro-vent valve again. Figure 5As shown, when the control chamber is closed, if the water pump suddenly loses power and stops, the pressure drop wave will cause severe negative pressure along the infusion pipeline, especially at a certain local high point, creating a large cavity. At this time, the negative pressure suction component opens the fourth port, and a large amount of air enters the infusion pipeline to destroy the negative pressure. At the same time, the water in the second valve body is discharged into the cavity of the infusion pipeline through the first valve body, the first float descends, and the micro-venting hole opens.

[0038] In this embodiment, the diameter of the micro-venting hole is limited to 1 / 200 of the pipe diameter.

[0039] The third valve seat 34 is integrally formed on the third valve body 31 and its inner circumference has an arc-shaped contact surface 341 that is tangent to the lower edge of the second float ball 32.

[0040] This setup allows for convenient processing of high-speed limited-volume exhaust valves while ensuring stable operation.

[0041] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. An air valve assembly, installed on an infusion pipeline, characterized in that: It includes a negative pressure intake valve (1), a micro exhaust valve (2) for micro exhaust, a high-speed limited exhaust valve (3) for rapid limited exhaust, and an electronic switch valve (4). The negative pressure suction valve (1) includes a first valve body (11) and a negative pressure suction assembly. The first valve body (11) has a first port (111), a second port (112), a third port (113), and a fourth port (114). The first port (111) is connected to the infusion pipeline, and the air inlet of the micro-vent valve (2) is connected to the second port (112). The electronic switching valve (4) includes a fourth valve body (41). The inner cavity of the fourth valve body (41) includes a control cavity (42) and a first cavity (43) and a second cavity (44) located at both ends of the control cavity (42) and both connected to the control cavity (42). The electronic switching valve (4) also includes an opening and closing element (45) located in the opening and closing element (45) and an opening and closing control element (46) that controls the movement of the opening and closing element (45) to open and close the control cavity (42). The end of the first cavity (43) away from the control cavity (42) is connected to the third port (113) through a connecting pipe (5). The end of the second cavity (44) away from the control cavity (42) is connected to the inlet of the high-speed limited exhaust valve (3). The fourth valve body (41) is also provided with a normally open conduit (47) that connects the second cavity (44) and the connecting pipe (5). The high-speed limited exhaust valve (3) includes a third valve body (31), a third valve seat (34) located in the lower end cavity of the third valve body (31), a second float (32) that cooperates with the third valve seat (34), and a detection and control component that is electrically connected to the opening and closing control component (46) and detects the position of the second float (32). The upper end of the third valve body (31) is provided with a high-speed limited exhaust port (311). The second float (32) floats and rises to have a first height position that is in contact with the third valve seat (34) and a second height position that moves upward away from the third valve seat (34). When the detection and control component detects that the second float (32) is in the first height position, the opening and closing control component (46) opens the flow of the control cavity (42) after a delay. When the detection and control component detects that the second float (32) is in the second height position, the opening and closing control component (46) immediately closes the flow of the control cavity (42). The negative pressure suction component is located at the fourth port (4) and is used to control the opening and closing of the fourth port (114). When the external pressure is greater than the internal pressure of the first valve body (11), the negative pressure suction component opens the fourth port (114) to connect the outside world and the inner cavity of the first valve body (11). When the external pressure is not greater than the internal pressure of the first valve body (11), the negative pressure suction component closes the fourth port (114) to disconnect the connection between the outside world and the inner cavity of the first valve body (11).

2. The air valve assembly according to claim 1, characterized in that: The detection and control component includes a first displacement sensor (331), a second displacement sensor (332), a first relay (333), and a second relay (334). The first relay (333) is connected in series between the first displacement sensor (331) and the opening / closing control element (46), and the second relay (334) is connected in series between the second displacement sensor (332) and the opening / closing control element (46). When the second float (32) rises to the second height position, the second displacement sensor (332) is triggered, the second relay (334) is immediately de-energized, and the opening and closing control component (46) immediately closes the flow of the control cavity (42); When the second float (32) descends to the first height position, the first displacement sensor (331) is triggered, the first relay (333) is energized after a delay, and the opening and closing control component (46) opens the flow of the control cavity (42) after a delay.

3. An air valve assembly according to claim 1, characterized in that: The negative pressure suction assembly includes a first valve seat (12), a first valve core (13), and a first spring (14). The first valve seat (12) is located inside the first valve body (11) near the fourth port (114). A positioning seat (15) is also fixed inside the first valve body (11). The two ends of the first spring (14) are respectively connected to the first valve core (13) and the positioning seat (15). When the pressure on the upper end face of the first valve core (13) is greater than the pressure on its lower end face, the first valve core (13) moves down and compresses the first spring (14), and the fourth port (114) opens; When the pressure on the upper end face of the first valve core (13) is less than the pressure on its lower end face, the first valve core (13) moves upward under the restoring force of the first spring (14) to abut against the first valve seat (12), and the fourth port (114) is closed.

4. An air valve assembly according to claim 3, characterized in that: The negative pressure suction assembly also includes a positioning rod (16). The positioning seat (15) has a positioning hole (151) that is adapted to the shape of the positioning rod (16) in a vertical direction. The positioning rod (16) is vertically arranged in the first valve body (11) and one end of it is fixedly connected to the first valve core (13). The other end of it passes through the positioning hole (151) and forms a sliding fit with it. The first spring (14) is sleeved on the outside of the positioning rod (16).

5. An air valve assembly according to any one of claims 1-4, characterized in that: The micro-vent valve (2) includes a second valve body (21), a first float (22), a second valve core (23), a lever assembly (24), and a second valve seat (25). The upper end of the second valve body (21) is provided with a micro-vent hole (211). The second valve seat (25) is located inside the second valve body (21) near the micro-vent hole (211) and cooperates with the second valve core (23). The first float (22) is located inside the second valve body (21) and is linked to the lever assembly (24). The second valve core (23) is fixedly connected to the lever assembly (24). The first float (22) floats in a third open position where the second valve core (23) is pulled away from the second valve seat (25) by the lever assembly (24) to open the micro exhaust hole (211) and a fourth closed position where the second valve core (23) is pressed against the second valve seat (25) to close the micro exhaust hole (211).

6. An air valve assembly according to any one of claims 1-4, characterized in that: The third valve seat (34) is integrally formed on the third valve body (31) and its inner circumference has an arc-shaped contact surface (341) that is tangent to the lower edge of the second float (32).

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