Airbag water hammer protection device

Abstract

The utility model relates to water hammer protection technical field, specifically is a kind of water hammer protection device of cancelling air bag, the device should be able to weaken water hammer peak value, simultaneously have the characteristics of fast response speed and long service life.The technical scheme of the utility model is: a kind of water hammer protection device of cancelling air bag, including the water tank being communicated water supply pipeline by first connecting pipe, the gas tank being communicated water tank by second connecting pipe, the monitoring unit of monitoring water tank and gas tank pressure;The gas tank is separated in the upper portion of the water tank by first separator;Air valve and gate valve are equipped on the second connecting pipe;The gas tank includes high-pressure chamber and low-pressure chamber separated by second separator, and high-pressure chamber is arranged above low-pressure chamber.

Description

Technical Field

[0001] This utility model relates to the field of water hammer protection technology, specifically a water hammer protection device that eliminates the need for an airbag. Background Technology

[0002] In the field of water hammer protection technology, water hammer protection devices with air bladders have gained widespread application due to their significant advantages. Based on the principle of gas buffering, this device pre-fills the air bladder with high-pressure gas. When water hammer occurs, the impact force of the liquid in the pipeline causes the air bladder to dynamically expand and contract—when the water hammer pressure rises sharply, the air bladder contracts to absorb energy; when the pressure drops sharply, the air bladder expands to release gas, thus effectively mitigating pressure fluctuations. Its unique gas-liquid isolation design prevents high-pressure gas from dissolving in water, effectively avoiding serious consequences such as pipeline rupture and equipment damage. Furthermore, compared to traditional unidirectional pressure regulating towers and other protective equipment, this type of device has a more streamlined structural design and significantly greater installation flexibility. Whether the pipeline system is laid horizontally, erected vertically, or arranged at an angle, it can be quickly installed and disassembled, greatly expanding its application scenarios.

[0003] However, this technology also has limitations that cannot be ignored. On the one hand, airbags are mostly made of high-cost materials such as nitrile rubber and hydrogenated nitrile rubber. When exposed to complex fluid environments for a long time, they are prone to chemical corrosion and material aging, which leads to a decline in the sealing performance and reduced elasticity of the protective device, directly affecting the protective effect. On the other hand, since the expansion and contraction of the airbag takes a certain amount of time, a delay may occur in systems with extremely high requirements for response to pressure changes, making it difficult to meet the instantaneous protection needs of sudden water hammer events.

[0004] In summary, while existing water hammer protection devices with airbags have certain advantages, their shortcomings also limit their further development. Therefore, developing a water hammer protection device that eliminates the need for an airbag is of significant practical importance. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings in the above-mentioned background technology and provide a water hammer protection device that eliminates the need for an airbag. This device should be able to reduce the peak value of water hammer and has the characteristics of fast response speed and long service life.

[0006] The technical solution of this utility model is:

[0007] A water hammer protection device without an airbag includes a water tank connected to a water supply pipeline via a first connecting pipe, an air tank connected to the water tank via a second connecting pipe, and a monitoring unit for monitoring the pressure of the water tank and the air tank. The air tank is separated from the water tank by a first partition. An air valve and a gate valve are provided on the second connecting pipe. The air tank includes a high-pressure chamber and a low-pressure chamber separated by the second partition, with the high-pressure chamber located above the low-pressure chamber.

[0008] The second connecting pipe is connected to the first port of the switching valve, the second port of the switching valve is connected to the high-pressure chamber through the high-pressure connecting pipe, and the third port of the switching valve is connected to the low-pressure chamber through the low-pressure connecting pipe.

[0009] The second connecting pipe includes a front section and a rear section; the inlet end of the front section passes vertically downward through the high-pressure chamber and the low-pressure chamber and then connects to the top of the water tank; the inlet end of the rear section connects to the outlet end of the front section, and the outlet end of the rear section extends vertically downward into the high-pressure chamber and connects to the first port of the switching valve; the air valve and the gate valve are located above the high-pressure chamber and connected to the rear section of the second connecting pipe.

[0010] The inlet end of the rear section is also fixed to the top of the high-pressure chamber.

[0011] The monitoring unit includes a first pressure sensor installed in the high-pressure chamber, a second pressure sensor installed in the low-pressure chamber, a level gauge installed in the water tank, and a controller electrically connected to the switching valve, the first pressure sensor, the second pressure sensor, and the level gauge.

[0012] It also includes an air compressor; the air compressor is connected to a high-pressure chamber through a high-pressure inflation pipe, and a high-pressure inflation valve is provided on the high-pressure inflation pipe; the air compressor is connected to a low-pressure chamber through a low-pressure inflation pipe, and a low-pressure inflation valve is provided on the low-pressure inflation pipe; the high-pressure inflation valve and the low-pressure inflation valve are three-way valves.

[0013] The beneficial effects of this utility model are:

[0014] 1. The water tank and air tank are physically isolated by a first separator, effectively preventing contact between water and air, significantly reducing equipment manufacturing costs compared to traditional airbag-type air tanks. Meanwhile, the air valve is located on the top of the air tank, a design that facilitates later inspection and maintenance, improving the ease of use of the equipment.

[0015] 2. An air valve is used as the connection hub between the water tank and the gas tank. When the device is in steady state, the air valve is closed to prevent air from dissolving in the water. When dangerous conditions such as power failure of the water pump occur, the air valve opens automatically, and the gas in the gas tank quickly forms an air cushion to effectively cope with the positive and negative water hammer impact generated in the pipeline, ensuring the safety and stability of the system.

[0016] 3. The gas tank is divided into a high-pressure chamber and a low-pressure chamber by a second partition. During stable system operation, the low-pressure chamber is connected to the air valve to prevent the air valve from opening accidentally due to fluctuations in the water pump head, thus reducing the risk of air dissolution. In the event of sudden dangerous conditions such as power failure of the water pump, the high-pressure chamber is quickly connected to the air valve, using high-pressure gas to form a strong buffer air cushion, achieving reliable water hammer protection and maximizing the protective effectiveness. Attached Figure Description

[0017] The following describes some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components.

[0018] Figure 1 This is a structural schematic diagram of an embodiment of the utility model.

[0019] Figure label:

[0020] 1. Water tank; 2. First connecting pipe; 3. Water supply pipe; 4. High-pressure chamber; 5. Low-pressure chamber; 6. Air tank; 7. First partition; 8. Air valve; 9. Gate valve; 10. Second connecting pipe; 10.1 front section; 10.2 rear section; 13. Second partition; 14. Switching valve; 15. High-pressure connecting pipe; 16. Low-pressure connecting pipe; 17. First pressure sensor; 18. Second pressure sensor; 19. Level gauge; 20. High-pressure air charging pipe; 21. High-pressure air charging valve; 22. Low-pressure air charging pipe; 23. Low-pressure air charging valve; 24. Air compressor. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Embodiment 1

[0022] like Figure 1 As shown, a water hammer protection device without an airbag includes a water tank 1, an air tank 6, a first connecting pipe 2, a second connecting pipe 10, a high-pressure inflation pipe 20, a low-pressure inflation pipe 22, an air compressor 24, and a monitoring unit.

[0023] The water tank is connected to the water supply pipe 3 via a first connecting pipe. The water tank is connected to the air tank via a second connecting pipe. The air tank is located above the water tank. The second connecting pipe is equipped with an air valve 8 and a gate valve 9. Air in the water tank first passes through the gate valve, and then through the air valve to connect with the air tank.

[0024] The water tank and the gas tank are integrated. The gas tank includes a high-pressure chamber 4 and a low-pressure chamber 5. The upper part of the water tank is separated from the gas tank by a first partition 7, and the gas tank is located above the water tank, thus completely isolating the gas tank from the water tank. Inside the gas tank, a second partition 13 separates the high-pressure chamber from the low-pressure chamber, and the high-pressure chamber is located above the low-pressure chamber, thus completely isolating the high-pressure chamber from the low-pressure chamber.

[0025] The second connecting pipe is equipped with a switching valve 14 for controlling the connection between the second connecting pipe and the high-pressure chamber and / or the low-pressure chamber. The switching valve is a three-way valve. The second connecting pipe includes a front section 10.1 and a rear section 10.2 that are connected to each other.

[0026] The front section is first arranged horizontally, and then the inlet end of the front section is bent at 90 degrees and then vertically downwards through the top of the high-pressure chamber and the top of the low-pressure chamber (second partition), and finally connects to the top of the water tank (first partition), thereby connecting the water tank.

[0027] The inlet end of the rear section is fixed to the top of the high-pressure chamber and also connects to the outlet end of the front section. The outlet end of the rear section first extends vertically upward and then bends twice at 90 degrees. The outlet end of the rear section then extends vertically downward through the top of the high-pressure chamber and connects to the first port of the switching valve 14 located in the high-pressure chamber. The second port of the switching valve connects to the high-pressure chamber through the high-pressure connecting pipe 15. The third port of the switching valve connects to the top of the low-pressure chamber (second partition) through the low-pressure connecting pipe 16. By changing the closing of the switching valve, the second connecting pipe can be controlled to connect the high-pressure chamber and / or the low-pressure chamber. The air valve and gate valve are both located above the high-pressure chamber and connected to the rear section of the second connecting pipe through flanges.

[0028] The air compressor 24 is connected to the high-pressure chamber via a high-pressure charging pipe 20, which is equipped with a high-pressure charging valve 21. The air compressor is connected to the low-pressure chamber via a low-pressure charging pipe 22, which is equipped with a low-pressure charging valve 23. Both the high-pressure and low-pressure charging valves are three-way valves.

[0029] The monitoring unit includes a first pressure sensor 17, a second pressure sensor 18, a level gauge 19, and a controller. The first pressure sensor is installed in the high-pressure chamber, and the second pressure sensor is installed in the low-pressure chamber. The first and second pressure sensors respectively monitor the air pressure changes inside the high-pressure and low-pressure chambers. The level gauge is installed in the water tank to monitor the water level changes. The controller is electrically connected to the first pressure sensor, the second pressure sensor, and the level gauge, and controls the operation of the above-mentioned electrical components according to a preset program.

[0030] Example 2

[0031] A method for operating a water hammer protection device without an airbag includes the following steps:

[0032] 1. Initial water filling

[0033] When using it for the first time, open the high-pressure inflation valve and the low-pressure inflation valve to keep the gas tank connected to the atmosphere, and first fill the water tank 1 with water through the water supply pipe 3.

[0034] When the water tank is full of water, the float in the air valve is lifted up by the water, the air valve closes, the water pressure in the water tank is p, and the air pressure in the air tank is atmospheric pressure. The water pressure in the water tank is greater than the air pressure in the air tank.

[0035] Subsequently, the high-pressure and low-pressure inflation valves are controlled to disconnect the gas tank from the atmosphere, connecting the air compressor to the gas tank and inflating the high-pressure chamber 4 and low-pressure chamber 5. During inflation, the switching valve is controlled to connect the second connecting pipe 10 only to the low-pressure chamber, not to the high-pressure chamber. When the air pressure in the low-pressure chamber reaches the set pressure p... l When the pressure in the low-pressure chamber stops increasing, inflation to the high-pressure chamber continues until the pressure in the high-pressure chamber reaches the set pressure p. h When the high-pressure chamber is filled with air, the inflation process is complete.

[0036] p l =ρg(H min -1)

[0037] p h =ρgH max

[0038] p=ρgH

[0039] Where: ρ is the density of water, g is the acceleration due to gravity, and H... min H is the minimum head of the water pump. max H represents the maximum head of the water pump, and H is the head of the water pump when it is filled with water. min ≤H≤H max p l <p≤p h .

[0040] After inflation is complete, close the high-pressure inflation valve and the low-pressure inflation valve. The water pressure in the tank is still greater than the low-pressure chamber pressure. As the float in the air valve is lifted up by the water, the air valve remains closed, and the water hammer protection device enters normal working condition.

[0041] Since the pump's head is much greater than the tank's height, the pressure difference between the top and bottom of the tank can be considered negligible, and both can be considered as p.

[0042] 2. Normal operation

[0043] During the operation of the water supply pipeline, the water hammer protection device operates stably, the switching valve does not activate, and the air valve remains connected only to the low-pressure chamber. Although the pump head constantly changes, it never falls below H. min Ignoring water loss between the water pump and the water hammer protection device, as well as the height of the water tank, the water pressure in water tank 1 is not lower than ρgH. min The air pressure in the low-pressure chamber is p l (p l <ρgH min The water pressure at the bottom of the air valve is always greater than the gas pressure in the low-pressure chamber, so the air valve 8 remains closed. Water and gas are stored in the gas tank 6 and water tank 1 respectively, isolated from each other, and the gas pressure in the low-pressure chamber will not drop.

[0044] 3. Water hammer protection

[0045] When a power outage or other dangerous situation occurs, causing a drop in pressure in water supply pipeline 3, water tank 1 replenishes water into the pipeline. The water level in tank 1 drops, the float inside the air valve falls, and air valve 8 opens. Gas in the low-pressure chamber 5 enters the water tank, causing the gas pressure in the low-pressure chamber to fall below p. l .

[0046] At this point, the monitoring unit detects the pressure changes in the water tank and gas tank, and controls the switching valve to connect the second connecting pipe, the high-pressure connecting pipe, and the low-pressure connecting pipe. Gas from the high-pressure chamber simultaneously enters the low-pressure chamber and the water tank. Because the gas pressure in the high-pressure chamber is higher, a high-pressure air cushion is formed inside the water tank, which can maintain the minimum pressure of the water supply pipeline at a higher value, resulting in better negative pressure prevention.

[0047] 4. Water level recovery

[0048] After power to the water pump is restored, the pressure in the water supply pipeline rises, and the water level in the tank increases. Air inside the tank returns to the high-pressure and low-pressure chambers via the air valve. The air in the tank continues to act as an air cushion, preventing the pressure in the water supply pipeline from rising further. When the pressure in the low-pressure chamber reaches p... l Then, control the switching valve to connect the second connecting pipe only to the high-pressure connecting pipe. This prevents air from entering the low-pressure chamber, ensuring the pressure in the low-pressure chamber does not exceed p. l The rising water level in the tank causes the pressure in the high-pressure chamber to continue to rise.

[0049] As the water level in water tank 1 continues to rise until the tank is full, the float in the air valve is lifted by the water, the air valve closes, and all the gas in the water tank flows back to the high-pressure chamber of air tank 6, where the pressure reaches p. h At this point, control the switching valve to connect the second connecting pipe only to the low-pressure connecting pipe. The water hammer protection device then returns to normal operation.

[0050] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A water hammer protection device without an airbag, characterized in that: The water hammer protection device includes a water tank (1) connected to a water supply pipe (3) via a first connecting pipe (2), an air tank (6) connected to the water tank via a second connecting pipe (10), and a monitoring unit for monitoring the pressure of the water tank and the air tank; the air tank is separated above the water tank by a first partition (7); an air valve (8) and a gate valve (9) are provided on the second connecting pipe; the air tank includes a high-pressure chamber (4) and a low-pressure chamber (5) separated by a second partition (13), with the high-pressure chamber located above the low-pressure chamber.

2. A water hammer protection device without an airbag according to claim 1, characterized in that: The second connecting pipe is connected to the first port of the switching valve (14), the second port of the switching valve is connected to the high-pressure chamber (4) through the high-pressure connecting pipe (15), and the third port of the switching valve is connected to the low-pressure chamber (5) through the low-pressure connecting pipe (16).

3. A water hammer protection device without an airbag according to claim 2, characterized in that: The second connecting pipe includes a front section (10.1) and a rear section (10.2); the inlet end of the front section passes vertically downward through the high-pressure chamber and the low-pressure chamber and then connects to the top of the water tank; the inlet end of the rear section connects to the outlet end of the front section, and the outlet end of the rear section extends vertically downward into the high-pressure chamber and connects to the first port of the switching valve; the air valve and the gate valve are located above the high-pressure chamber and connected to the rear section of the second connecting pipe.

4. A water hammer protection device without an airbag according to claim 3, characterized in that: The inlet end of the rear section is also fixed to the top of the high-pressure chamber.

5. A water hammer protection device without an airbag according to claim 4, characterized in that: The monitoring unit includes a first pressure sensor (17) installed in the high-pressure chamber, a second pressure sensor (18) installed in the low-pressure chamber, a level gauge (19) installed in the water tank, and a controller electrically connected to the switching valve, the first pressure sensor, the second pressure sensor, and the level gauge.

6. A water hammer protection device without an airbag according to claim 5, characterized in that: It also includes an air compressor (24); the air compressor is connected to the high-pressure chamber through a high-pressure inflation pipe (20), and a high-pressure inflation valve (21) is provided on the high-pressure inflation pipe; the air compressor is connected to the low-pressure chamber through a low-pressure inflation pipe (22), and a low-pressure inflation valve (23) is provided on the low-pressure inflation pipe; the high-pressure inflation valve and the low-pressure inflation valve are three-way valves.

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