Water hammer protection device with built-in air valve

Abstract

The invention relates to a water hammer protection device with a built-in air valve, the water hammer protection device comprises a tank body, the air valve and a water level limiting part, a separator is arranged in the tank body, the separator divides the tank body into a water tank and an air tank, and the air tank is located above the water tank; a through hole is formed in the separator and communicates with the water tank and the gas tank, and a first connecting pipe is arranged on the side, away from the gas tank, of the water tank and used for communicating the water supply pipeline and the water tank; the air valve is arranged in the air tank and is communicated with the through hole through a second connecting pipe; the water level limiting part is located in the water tank and comprises a floating ball, a hole sealing ball, a lever and a supporting rod, the supporting rod is connected with the partition piece, the lever is hinged to the supporting rod and can rotate by a preset angle with the hinge point as the circle center, the hole sealing ball is arranged at one end of the lever in the length direction, and the floating ball is arranged at the other end of the lever in the length direction through a rope body; the water level limiting part is configured to drive the hole sealing ball to open and close the through hole through buoyancy of the floating ball.

Description

Technical Field

[0001] This application relates to the technical field of water hammer protection devices, specifically to a water hammer protection device with a built-in air valve. Background Technology

[0002] Water hammer is a common and dangerous phenomenon in pressure piping systems. Sudden changes in water flow velocity due to pump start-up / shutdown, valve opening / closing, etc., can trigger water hammer, generating instantaneous high or negative pressure. This can lead to pipe rupture, equipment damage, and severely impact the safe and stable operation of the system. Commonly used water hammer protection devices include air tanks and unidirectional pressure regulating towers. Air tanks store compressed air, which acts as a buffer when water hammer causes pressure fluctuations, effectively mitigating pressure shocks. They are also relatively simple in structure and do not require highly complex equipment. However, air tanks contain air bladders, making them expensive, and the air bladders are prone to leakage, reducing their water hammer protection effectiveness. Unidirectional pressure regulating towers are often installed in areas of the piping system prone to negative pressure and are a water hammer protection measure to prevent water column separation. Its advantages are significant. In the event of an accidental pump stoppage, when the main pipeline pressure drops below the level of the surge tank, the check valve quickly opens, replenishing water to the main pipeline and preventing water column separation caused by the pressure drop in the main pipeline. This significantly reduces water hammer pressure and provides good protection. However, the unidirectional surge tank has many components, making it prone to failure and difficult to inspect and maintain. During normal operation without pump stoppage, if components such as the check valve fail, there is a risk of triggering new water hammer, increasing the uncertainty of system operation. Although the above protective devices can protect against water hammer to a certain extent, each has its limitations. Therefore, there is an urgent need to develop more efficient and adaptable water hammer protection devices. Summary of the Invention

[0003] This application provides a water hammer protection device with a built-in air valve, which can more effectively protect against positive and negative water hammer at a lower cost.

[0004] The water hammer protection device with a built-in air valve provided in this application includes: The tank body has a partition that divides the tank body into a water tank and a gas tank, with the gas tank located above the water tank. The partition has a through hole that connects the water tank and the gas tank. The water tank has a first connecting pipe on the side away from the gas tank, which is used to connect a water supply pipe to the water tank. An air valve is provided inside the air tank and is connected to the through hole via a second connecting pipe; A water level limiting part is located inside the water tank. The water level limiting part includes a float, a sealing ball, a lever, and a support rod. The support rod is connected to the partition. The lever is hinged to the support rod and can rotate a preset angle around the hinge point. The sealing ball is disposed at one end of the lever along its length. The float is disposed at the other end of the lever along its length via a rope. The water level limiting part is configured to use the buoyancy of the float to drive the sealing ball to open and close the through hole.

[0005] In addition, the water hammer protection device with a built-in air valve provided in this application also has the following additional technical features: In one alternative approach, the density of water is defined as... The mass of the buoy is The volume of the buoy is The mass of the sealing ball is The volume of the sealing ball is ,but and They respectively satisfy: , .

[0006] In one alternative approach, the diameter of the through-hole is defined as... The pressure difference between the gas tank and the water tank when the water tank is at its lowest water level is: The length of the lever from the hinge point side to the float side is The length of the lever from the hinge point side to the sealing ball side is... ,but and satisfy: .

[0007] In one alternative embodiment, the support rod has a limit block at the end away from the separator, the hinge point of the lever and the support rod is close to the limit block, and the limit block is configured to limit the maximum rotation angle of the lever when it rotates counterclockwise.

[0008] In one alternative embodiment, when the water tank is filled with water and the gas tank is filled with high-pressure gas, the water hammer protection device has a first working state. In the first working state, the air valve is closed, the float floats, the limiting block limits the lever to keep the lever horizontal, and the through hole is open.

[0009] In one alternative, when the pressure in the water supply pipeline decreases, the water hammer protection device has a second working state. In the second working state, the air valve opens, the high-pressure gas in the air tank is introduced into the water tank, the water tank replenishes water to the water supply pipeline, and when the water level in the water tank is still sufficient to keep the float floating, the lever remains horizontal and the through hole is opened.

[0010] In one alternative, when the water level in the tank is lower than a preset minimum water level, the water hammer protection device has a third working state. In the third working state, the float is suspended, the rope is straightened and the lever rotates clockwise, which in turn drives the sealing ball to close the through hole, and the water level in the tank stops falling.

[0011] In one alternative, when the pressure in the water supply pipeline rises and the pressure at the bottom of the water tank is greater than the pressure in the air tank, the water hammer protection device has a fourth working state. In the fourth working state, the water level in the water tank rises, the float is lifted and floats, the lever rotates counterclockwise and drives the sealing ball to open the through hole, and the air in the water tank returns to the air tank to prevent the pressure in the water supply pipeline from rising too much.

[0012] In one alternative embodiment, when the pressure in the water supply pipeline rises and the pressure at the bottom of the water tank is less than the pressure in the air tank, the water hammer protection device has a fifth working state. In the fifth working state, the water level in the water tank rises, the float is lifted and floats, the lever rotates counterclockwise and drives the sealing ball to open the through hole. At this time, air enters the water tank from the air tank, causing the water level in the water tank to drop. The lever rotates clockwise and drives the sealing ball to close the through hole again to prevent the water level in the water tank from continuing to drop.

[0013] The beneficial effects of this application are as follows: The water hammer protection device with a built-in air valve in this application separates the water tank and the air tank through a separator, preventing water and air from coming into contact. Compared with air tanks using air bladders, the equipment cost is significantly reduced. Placing the air valve inside the air tank saves space and results in a simpler and more aesthetically pleasing structure. The air valve enables both connection and isolation between the water tank and the air tank. During stable operation, the air valve closes to prevent air from dissolving into the water. In dangerous conditions such as a power outage of the water pump, the air valve automatically opens to quickly replenish water to the supply pipeline, preventing negative pressure. When the pressure in the supply pipeline rises, the air valve remains open to prevent excessive pressure increase. Furthermore, the water level limiting unit ensures that the water level in the tank is always above the set minimum level. In cases of excessive air tank inflation pressure, air valve failure, incomplete water tank filling, or a power outage of the water pump, it prevents the water tank from being emptied, effectively protecting against both positive and negative water hammer while ensuring the safe operation of the water tank.

[0014] It should be understood that the above general description and the following detailed description are merely exemplary and do not limit this application. Attached Figure Description

[0015] Figure 1 A schematic diagram of the structure of the water hammer protection device provided in this application in a specific embodiment; Figure 2 for Figure 1 A schematic diagram of the water hammer protection device in the image when the float reaches its lowest position; Figure 3 This is a schematic diagram of the structure of the water level limiting part in one specific embodiment; Figure 4 The curve showing the water level change in the water tank when the initial pressure of the gas tank is 200 kPa; Figure 5 The pressure change curve after the pump is shown when the initial pressure of the gas tank is 200 kPa. Figure 6 The curve showing the water level change in the water tank when the initial pressure of the gas tank is 350 kPa; Figure 7 The curve shows the pressure change after the pump when the initial pressure of the gas tank is 350 kPa.

[0016] Reference numerals: 1. Water tank; 2. Gas tank; 3. Divider; 4. Air valve; 5. First connecting pipe; 6. Water supply pipe; 7. Support rod; 8. Lever; 9. Sealing ball; 10. Rope; 11. Float; 12. Second connecting pipe; 13. Limiting block.

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. Detailed Implementation

[0018] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0019] It should be understood that the described embodiments are merely some embodiments of this application, and not all embodiments. All other technical solutions obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0020] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0021] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0022] It should be noted that the directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0023] like Figure 1-7 As shown in the figure, this application embodiment provides a water hammer protection device with a built-in air valve. The water hammer protection device with a built-in air valve mainly includes a tank, an air valve 4, and a water level limiting part. A partition 3 is provided inside the tank, dividing the tank into a water tank 1 and an air tank 2, with the air tank 2 located above the water tank 1. The partition 3 has a through hole connecting the water tank 1 and the air tank 2. A first connecting pipe 5 is provided on the side of the water tank 1 away from the air tank 2, which connects the water supply pipe 6 and the water tank 1. In use, the water hammer protection device can be installed on the water supply pipe 6, and the water tank 1 and the water supply pipe 6 are connected through the first connecting pipe 5.

[0024] An air valve 4 is installed inside the air tank 2. The air valve 4 is connected to the through hole through the second connecting pipe 12. The air valve 4 and the second connecting pipe 12 can be connected by a flange to ensure the connection strength. In addition, a water level limiting part is located inside the water tank 1. The water level limiting part includes a float 11, a sealing ball 9, a lever 8, and a support rod 7. The support rod 7 is connected to the partition 3. The lever 8 is hinged to the support rod 7 and can rotate a preset angle around the hinge point. The sealing ball 9 is installed at one end of the lever 8 along its length. The float 11 is installed at the other end of the lever 8 along its length through a rope 10. The water level limiting part is configured to use the buoyancy of the float 11 to drive the sealing ball 9 to open and close the through hole.

[0025] In this embodiment, the water hammer protection device with a built-in air valve separates the water tank 1 and the air tank 2 through the separator 3, preventing water and air from contacting each other. Compared with the air tank 2 using an air bladder, the equipment cost is significantly reduced. Placing the air valve 4 inside the air tank 2 saves space and makes the structure simpler and more aesthetically pleasing. The air valve 4 is used to connect and isolate the water tank 1 and the air tank 2. During stable operation, the air valve 4 is closed to prevent air from dissolving into the water. In dangerous conditions such as power failure of the water pump, the air valve 4 automatically opens to quickly replenish water to the water supply pipe 6 to prevent negative pressure. When the pressure in the water supply pipe 6 rises, the air valve 4 remains open to prevent excessive pressure rise. In addition, the water level limiting unit can ensure that the water level in the water tank 1 is always higher than the set minimum water level. In abnormal situations such as excessive inflation pressure of the air tank 2, failure of the air valve 4, or water tank 1 not being full, the water tank 1 can be prevented from being emptied after a power failure of the water pump. This effectively protects against positive and negative water hammer while ensuring the operational safety of the water tank 1.

[0026] like Figure 3 As shown, in one specific embodiment, the density of water is defined as... The mass of float 11 is The volume of float 11 is The mass of the sealing ball 9 is The volume of the sealing sphere 9 is ,but and They respectively satisfy: , .

[0027] like Figure 3 As shown, in one specific embodiment, the diameter of the through hole is defined as... When water tank 1 is at its lowest water level, the pressure difference between air tank 2 and water tank 1 is: The length of lever 8 from the hinge point side to the float 11 side is The length of lever 8 from the hinge point side to the sealing ball 9 side is ,but and satisfy: .

[0028] like Figure 3 As shown, in one specific embodiment, the support rod 7 is provided with a limiting block 13 at the end away from the separator 3, and the hinge point between the lever 8 and the support rod 7 is close to the limiting block 13. The limiting block 13 is configured to limit the maximum rotation angle of the lever 8 when it rotates in the counterclockwise direction.

[0029] like Figure 1-2 As shown, in one specific embodiment, during normal operation, water tank 1 is filled with water, and gas tank 2 is filled with high-pressure gas. At this time, the water hammer protection device has a first working state. In this first working state, because the pressure in gas tank 2 is less than that in water tank 1, air valve 4 is closed. Because the weight of float 11 is less than its buoyancy, float 11 floats, and rope 10 is not straightened. Therefore, lever 8 is not under force on the right side of the hinge point (the side facing float 11), and the weight of sealing ball 9 is greater than its buoyancy. Lever 8 is under force on the left side of the hinge point (the side facing sealing ball 9), but under the action of limit block 13, the left end of lever 8 cannot rotate downwards, thus keeping lever 8 in a horizontal position and opening the through hole.

[0030] like Figure 1-2 As shown, in one specific embodiment, when an accident such as a power outage of the water pump occurs, the pressure in the water supply pipeline 6 decreases, and the water hammer protection device has a second working state. In the second working state, the air valve 4 automatically opens, and the high-pressure gas in the air tank 2 is replenished into the water tank 1. The water tank 1 replenishes water to the water supply pipeline 6 to prevent negative pressure from appearing in the pipeline. During this process, the water level in the water tank 1 decreases, and the float 11 falls, but it can still float on the water surface. The weight and buoyancy of the float 11 are balanced, the rope 10 will not be straightened, the right end of the lever 8 is not under force, the lever 8 remains in a horizontal position, and the through hole is in the open state.

[0031] like Figure 1-2 As shown, in one specific embodiment, when the water level in the water tank 1 is lower than the preset minimum water level, the water hammer protection device has a third working state. In the third working state, the rope 10 is straightened and the float 11 is suspended in the air. Since the torque of the float 11 acting on the lever 8 is greater than that of the sealing ball 9, the weight of the float 11 can drive the lever 8 to rotate clockwise and drive the sealing ball 9 on the other side of the lever 8 to close the through hole. The air in the air tank 2 cannot continue to enter the water tank 1, thereby preventing the water level in the water tank 1 from dropping further.

[0032] like Figure 1-2As shown, in one specific embodiment, when the pressure in the water supply pipe 6 rises, if the pressure at the bottom of the water tank 1 is greater than the pressure in the air tank 2, the water hammer protection device has a fourth working state. In the fourth working state, the pressure rise in the water supply pipe 6 will cause the water level in the water tank 1 to rise, the float 11 will be lifted and float, the force on the right end of the lever 8 (the end facing the float 11) will become zero, the lever 8 will rotate counterclockwise, and drive the sealing ball 9 to open the through hole, so that the air in the water tank 1 will return to the air tank 2 to prevent the pressure in the water supply pipe 6 from rising too much.

[0033] like Figure 1-2 As shown, in one specific embodiment, when the pressure in the water supply pipe 6 rises, if the pressure at the bottom of the water tank 1 is less than the pressure in the air tank 2, the water hammer protection device has a fifth working state. In the fifth working state, the water level in the water tank 1 rises, the float 11 is lifted and floats, the force on the right end of the lever 8 (the end facing the float 11) becomes zero, the lever 8 rotates counterclockwise, and drives the sealing ball 9 to open the through hole. At this time, because the pressure at the bottom of the water tank 1 is less than the pressure in the air tank 2, air will enter the water tank 1 from the air tank 2, causing the water level in the water tank 1 to drop. After the water level drops to the preset minimum water level, the float 11 is suspended, the lever 8 rotates clockwise and drives the sealing ball 9 to close the through hole again to prevent the water level in the water tank 1 from continuing to drop. The through hole on the separator 3 can only be opened normally when the pressure in the water supply pipe 6 rises to the point that the pressure at the bottom of the water tank 1 is greater than the pressure in the air tank 2, that is, it returns to the fourth working state.

[0034] Example 1: This embodiment takes the water hammer protection device without a water level limiting part as an example. That is, the water hammer protection device includes a water tank 1, an air tank 2, and an air valve 4. The water tank 1 is located on the water supply pipe 6 and is connected to the water supply pipe 6 through a first connecting pipe 5. The air tank 2 is located above the water tank 1. The air tank 2 and the water tank 1 are separated by a partition 3. The partition 3 has a through hole, and a second connecting pipe 12 is provided above the through hole. The air valve 4 is located inside the air tank 2, and the lower end of the air valve 4 is connected to the second connecting pipe 12 through a flange.

[0035] In this embodiment, the cross-sectional area of ​​water tank 1 is 0.5m². 2 It is 2m high, and the cross-sectional area of ​​the gas tank is 0.5m². 2 The height is 1m, and the diameter of the air valve 4 is DN65. The water supply pipeline 6 is 200m long, the water pump head is 50m, the bottom elevation of the water tank 1 is 0m, the water level of the high-level water tank is 40m, and the minimum water level of the water tank 1 is set to 0.5m.

[0036] The operation method of the water hammer protection device in this embodiment is as follows: During normal operation, water tank 1 is filled with water at a pressure of approximately 480 kPa, while air tank 2 is filled with air at a pressure of 200 kPa. Because the pressure in air tank 2 is lower than that in water tank 1, air valve 4 is closed.

[0037] When an accident such as a power outage of the water pump occurs, the pressure in the water supply pipeline 6 decreases, the air valve 4 opens automatically, and the high-pressure gas in the air tank 2 is replenished into the water tank 1. The water tank 1 then replenishes water to the water supply pipeline 6 to prevent negative pressure from occurring in the pipeline.

[0038] When the pressure in the water supply pipe 6 rises, the air valve 4 remains open, the water level in the water tank 1 rises, and air returns from the water tank 1 to the air tank 2. The gas in the water tank 1 acts as an air cushion to prevent the pressure in the water supply pipe 6 from rising too much. When the water tank 1 is full of water, the air valve 4 closes.

[0039] The water level change in tank 1 after the water pump is powered off is as follows: Figure 4 As shown. During this process, the lowest water level in tank 1 was 1.35m, far exceeding the set minimum water level of 0.5m. The pressure change after the pump is as follows. Figure 5 As shown, after adopting the water hammer protection device, the minimum pressure after the pump is 0.3m, which effectively suppresses the negative water hammer in the pipeline.

[0040] Example 2: This embodiment uses a water hammer protection device with a water level limiting part as an example. The water hammer protection device includes a support rod 7, a lever 8, a float 11, a rope 10, and a sealing ball 9. The support rod 7 is located below the separator 3 and is fixedly connected to it. A limit block 13 at the bottom of the support rod 7 limits the stroke of the lever 8. The lever 8 is hinged to the support rod 7 and can rotate around the hinged position. One end of the lever 8 is fixedly connected to the sealing ball 9, and the other end is connected to the rope 10. The other end of the rope 10 is connected to the float 11. When the lever 8 rotates clockwise from the horizontal position, the sealing ball 9 can close the through hole on the separator 3.

[0041] In this embodiment, the initial pressure of air tank 2 is 350 kPa. Since the initial pressure of air tank 2 is less than that of water tank 1, air valve 4 is closed. The operation method of the water hammer protection device is as follows: During normal operation, the weight of the float 11 is less than the buoyancy, so the rope 10 will not be straightened, and the right end of the lever 8 is not under force. The weight of the sealing ball 9 is greater than the buoyancy, so the left end of the lever 8 is under force, but under the action of the limiting block 13, the left end of the lever 8 cannot rotate downward, thus keeping the lever 8 in a horizontal position and opening the through hole.

[0042] To ensure that the weight of the float 11 is less than the buoyancy, the mass of the float 11... and volume satisfy ,in It is the density of water.

[0043] To ensure that the weight of the sealing ball 9 is greater than the buoyancy, the mass of the sealing ball 9... and volume satisfy .

[0044] In the event of an accident such as a power outage to the water pump, the pressure in the water supply pipe 6 decreases, the air valve 4 automatically opens, and the high-pressure gas in the air tank 2 is injected into the water tank 1. The water tank 1 then replenishes water into the water supply pipe 6 to prevent negative pressure from forming in the pipe. During this process, the water level in the water tank 1 decreases, the float 11 falls and floats on the water surface. The weight and buoyancy of the float 11 are balanced, the rope 10 is not taut, the right end of the lever 8 is not under force, the lever 8 remains in a horizontal position, and the through hole is in the open state.

[0045] Due to the excessive initial pressure of the gas in gas tank 2, the water level in water tank 1 drops rapidly. When the water level in water tank 1 drops to the lowest level of 0.5m, the rope 10 is straightened, and the float 11 is suspended in the air. Since the torque exerted by the float 11 on the lever 8 is greater than that of the sealing ball 9, the lever 8 rotates clockwise, sealing the through hole on the separator 3. Air cannot enter water tank 1, thus preventing the water level in water tank 1 from dropping further.

[0046] Through hole diameter is At the lowest water level, the pressure difference between gas tank 2 and water tank 1 is: The net force on the sealing ball 9 is then... The lengths of lever 8 on the left and right sides of the hinge point are respectively and To ensure that the sealing ball 9 can successfully seal the through hole, it should be ensured that... .

[0047] When the pressure in the water supply pipe 6 rises, the pressure at the bottom of the water tank 1 is greater than the pressure in the air tank 2, the water level in the water tank 1 rises, lifting the float 11, the force on the right end of the lever 8 becomes zero, the lever 8 rotates counterclockwise, the through hole on the separator 3 opens, and air returns from the water tank 1 to the air tank 2, preventing the pressure in the water supply pipe 6 from rising too much.

[0048] The water level change in tank 1 after the water pump is powered off is as follows: Figure 6 As shown, the lowest water level in tank 1 during this process is 0.5m. The pressure change after the pump is as follows. Figure 7 As shown, the minimum pressure after pumping is 4.2m after the water hammer protection device is adopted, which effectively suppresses the negative water hammer in the pipeline.

[0049] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A water hammer arrestor with an air valve built-in, characterized by, The utility model provides a water hammer protection device, comprising: a tank body, a partition is arranged in the tank body, the partition divides the tank body into a water tank and a gas tank, the gas tank is above the water tank, the partition is provided with a through hole, the through hole is communicated with the water tank and the gas tank, the water tank is provided with a first connecting pipe on the side far from the gas tank, the first connecting pipe is used for connecting a water supply pipeline and the water tank; an air valve is arranged in the gas tank, the air valve is communicated with the through hole through a second connecting pipe; a water level limiting part is arranged in the water tank, the water level limiting part comprises a floating ball, a sealing ball, a lever and a support rod, the support rod is connected with the partition, the lever is hinged with the support rod and can rotate a preset angle with the hinged point as the center, the sealing ball is arranged at one end of the lever along the length direction, the floating ball is arranged at the other end of the lever along the length direction through a rope, the water level limiting part is configured to drive the sealing ball to open and close the through hole by the buoyancy of the floating ball.

2. The in-line air valve water hammer arrestor of claim 1, wherein, The density of water is defined as , the mass of the float ball is , the volume of the float ball is , the mass of the sealing ball is , the volume of the sealing ball is , then and respectively satisfy: , .

3. The in-line air valve water hammer arrestor of claim 2, wherein, the diameter of the through hole is defined as the pressure difference between the gas tank and the water tank at the lowest water level is the length of the lever from the hinged point side to the side of the float ball is the length of the lever from the hinged point side to the side of the sealing ball is then and are satisfied: 。 4. The air-in-liquid valve water hammer arrestor of any one of claims 1-3, wherein, The support rod is provided with a limiting block at the end far from the partition, the hinged point of the lever and the support rod is close to the limiting block, the limiting block is configured to limit the maximum rotation angle of the lever when rotating counterclockwise.

5. The in-line air valve water hammer arrestor of claim 4, wherein, When the water tank is filled with water and the gas tank is filled with high-pressure gas, the water hammer protection device has a first working state, in the first working state, the air valve is closed, the floating ball floats, the limiting block limits the lever to keep it horizontal, and the through hole is open.

6. The in-line air valve water hammer arrestor of claim 4, wherein, When the pressure in the water supply pipeline decreases, the water hammer protection device has a second working state, in the second working state, the air valve is open, the high-pressure gas in the gas tank is supplemented into the water tank, the water tank supplements water to the water supply pipeline, when the water level in the water tank can still keep the floating ball floating, the lever keeps horizontal, and the through hole is open.

7. The in-line air valve water hammer arrestor of claim 6, wherein, When the water level in the water tank is lower than a preset minimum water level, the water hammer protection device has a third working state, in the third working state, the floating ball is suspended, the rope is straightened and makes the lever rotate clockwise, and drives the sealing ball to close the through hole, and the water level in the water tank stops falling.

8. The in-line air valve water hammer arrestor of claim 7, wherein, When the pressure in the water supply pipeline rises and the pressure at the bottom of the water tank is greater than the pressure in the gas tank, the water hammer protection device has a fourth working state, in the fourth working state, the water level in the water tank rises, the floating ball is lifted and floats, the lever rotates counterclockwise, and drives the sealing ball to open the through hole, and the air in the water tank returns to the gas tank to prevent the pressure in the water supply pipeline from rising too much.

9. The air-in-liquid valve water hammer arrestor of claim 7 or 8, wherein, When the pressure in the water supply pipe recovers and the pressure at the bottom of the water tank is less than the pressure in the air tank, the water hammer protection device has a fifth working state, in which the water level in the water tank rises, the floating ball is lifted and floats, the lever rotates counterclockwise, and drives the hole sealing ball to open the through hole, at this time air enters the water tank from the air tank and makes the water level in the water tank decrease, the lever rotates clockwise and drives the hole sealing ball to close the through hole again to prevent the water level in the water tank from continuing to decrease.

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