Damping device for eliminating water hammer

Abstract

The invention belongs to the technical field of devices for eliminating water hammer influence of a system, and particularly relates to a damping device for eliminating a water hammer. An inner cavity of the valve body is divided into two parts by the piston, the upper part is a low-pressure closed cavity, the lower part is a high-pressure open cavity, a spring is arranged between the valve body and the piston, the bottom of the valve body is connected with an inlet stop valve, the side face of the valve body is connected with a pressure relief back pressure valve, and a pump is arranged between the inlet stop valve and the pressure relief back pressure valve. The lower portion of the valve body is connected with a flange through bolts and nuts. The damping device for eliminating the water hammer is wide in applicable pressure range, can be temporarily used under the working condition of high water hammer pressure, the working condition of low water hammer pressure and the condition of poor sealing performance of a piston, and achieves the purposes of preventing the water hammer from occurring in a system, protecting a pipeline system and equipment and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of devices for eliminating water hammer influence of a system, and in particular relates to a damping device for eliminating water hammer. Background Art

[0002] During water supply and some liquid transportation, water hammer phenomenon often occurs due to the sudden increase of pressure in the pipeline caused by the opening and closing of valves or pumps, especially in high-rise buildings. This water hammer phenomenon is also called water hammer. In addition to producing annoying noise and vibration, its severity will affect the operation of the entire pipeline system and damage equipment such as pumps and check valves. The Italian OR water hammer eliminator can effectively eliminate the irregular water hammer wave oscillation caused by water hammer and surge that may be generated by various types of fluids in the transmission system without blocking the flow of fluids, thereby eliminating destructive shock waves and achieving a protective purpose.

[0003] The traditional water hammer arrester is composed of a nickel-plated brass valve body, a polymer piston with a sealing ring, and a high-alloy steel spring. The inner cavity of the water hammer arrester is divided into two by the piston. The upper part is a closed cavity filled with air, and the lower part is an open cavity in contact with the medium.

[0004] There is a closed air chamber inside the water hammer eliminator, and a piston at the lower end. When the shock wave enters the water hammer eliminator, the water hammer wave acts on the piston, and the piston moves toward the air chamber. The stroke of the piston movement is related to the gas pressure in the air chamber and the size of the water hammer wave. Under the dual effects of gas at a certain pressure and irregular water hammer, the piston moves up and down to form a dynamic balance, which can eliminate irregular water hammer wave oscillations. However, in the case of particularly large water pressure fluctuations, the water hammer eliminator cannot completely relieve the pressure of the water hammer. The buffering of the water hammer pressure is all stored by the spring. If the spring fails, the water hammer eliminator will fail and it will be impossible to determine online whether the water hammer eliminator can operate reliably. Summary of the invention

[0005] The present invention provides a damping device for eliminating water hammer, which has a wide applicable pressure range and can be used in working conditions where the water hammer pressure is large or small, and can also be temporarily used when the piston is not tightly sealed, thereby achieving the purpose of preventing water hammer from occurring in the system and protecting the pipeline system and equipment, etc. The device can effectively cope with water hammers in various pressure ranges, from small pressure to large pressure, and can be temporarily and reliably used when the piston is not tightly sealed.

[0006] In order to achieve the above object, the technical solution adopted by the present invention is:

[0007] A damping device for eliminating water hammer, wherein the inner cavity of a valve body is divided into two by a piston, the upper portion is a low-pressure closed cavity, and the lower portion is a high-pressure open cavity, a spring is arranged between the valve body and the piston, the bottom of the valve body is connected to an inlet stop valve, the side of the valve body is connected to a pressure relief back pressure valve, and a pump is arranged between the inlet stop valve and the pressure relief back pressure valve.

[0008] The lower part of the valve body is connected to the flange by bolts and nuts.

[0009] When the shock wave is transmitted, the water hammer wave acts on the piston, converting the pressure energy of the water hammer into the elastic potential energy of the spring, and the piston moves upward toward the low-pressure closed cavity.

[0010] When the water hammer pressure is small, the pipeline pressure can be effectively adjusted through the piston and spring.

[0011] When the water hammer pressure is large, the spring is compressed and deformed greatly, the piston moves upward to the top of the pressure relief back pressure valve, the high-pressure opening chamber is connected to the pressure relief back pressure valve, and the excess medium pressure is discharged through the pressure relief back pressure valve. After the pressure is reduced, the piston moves downward to the bottom of the pressure relief back pressure valve, the high-pressure opening chamber is disconnected from the pressure relief back pressure valve, and the medium is no longer discharged. Instead, the pipeline pressure is adjusted by the piston and spring to finally reach pressure balance.

[0012] When the water hammer pressure is small, under the dual action of the spring and irregular water hammer, the piston converts the pressure energy of the water hammer into the elastic potential energy of the spring, moves up and down, and continuously converts between the pressure energy of the water and the elastic potential energy of the spring, forming a dynamic balance, which can eliminate irregular water hammer wave oscillations, greatly reduce the pressure of the water hammer, and protect the pipeline system and related equipment.

[0013] When the water hammer pressure is large, the pressure energy of the water hammer is converted into the elastic potential energy of the spring. The spring is greatly compressed, causing the piston to move upward onto the pressure relief back pressure valve, so that the pressure relief back pressure valve is connected to the high-pressure opening chamber, and the high-pressure water is discharged from the high-pressure side to the low-pressure side through the pressure relief back pressure valve, forming a bypass pipeline for the protected equipment, reducing the peak pressure without retransmitting the pressure back, and protecting the pressure-sensitive equipment in the system; when the pressure is reduced to the pressure relief pressure, the piston moves downward to the pressure relief back pressure valve, the high-pressure opening chamber is isolated, and the piston enters the low-pressure water hammer working condition. Under the dual action of the elastic potential energy of the spring and the irregular water hammer pressure energy, the piston moves up and down, forming a dynamic balance, eliminating irregular water hammer wave oscillations until the pressure is stable.

[0014] The device is installed in front of single-handle faucets, ball valves, gate valves, and pumps.

[0015] The device can be installed vertically, horizontally or inverted.

[0016] The beneficial effects achieved by the present invention are:

[0017] When the water hammer pressure is small, the piston moves up and down under the dual action of the spring and irregular water hammer, forming a dynamic balance, eliminating irregular water hammer wave oscillations, and achieving peak elimination and valley filling. When the water hammer pressure is large, the piston moves upward to the upper limit pressure relief port and connects with the lower high-pressure chamber. The high-pressure water is discharged from the high-pressure side to the low-pressure side through the pressure relief channel to reduce the maximum peak pressure of the system and protect the key pressure-sensitive equipment in the system. Reliability design is carried out, and the water hammer eliminator can be loaded and unloaded online when the system is running to ensure the reliability of system operation. Reliability design is carried out, and the high and low pressures can be reversely blocked by the piston when the pressure relief pressure is not reached. If the high and low pressures are connected when the pressure is not relieved, the water hammer eliminator is faulty and needs to be repaired and replaced. The requirements for the piston sealing performance are not high, and it can be used temporarily when the piston sealing is not strict. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The structure diagram of a damping device for eliminating water hammer is shown in FIG.

[0019] Figure 2 The figure is a schematic diagram of the installation of a damping device for eliminating water hammer;

[0020] In the figure: 1: valve body, 2: closed chamber, 3: spring, 4: piston, 5: open chamber, 6: bolt, 7: nut, 8: flange, 9: inlet stop valve, 10: pump, 11: pressure relief back pressure valve. DETAILED DESCRIPTION

[0021] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] Water hammer eliminator can effectively eliminate irregular water hammer wave oscillation caused by water hammer and surge during the transmission of various fluids without damaging the equipment, thereby eliminating destructive shock waves and protecting systems and pressure-sensitive equipment.

[0023] The system consists of the following parts:

[0024] The inlet pipeline loop of the water hammer arrester includes: an inlet stop valve 9. The inlet stop valve 9 is closed when the water hammer arrester is not in use or under maintenance, and the inlet stop valve 9 is opened when the water hammer arrester needs to be put into use.

[0025] The outlet pipeline circuit of the water hammer arrester includes: a pressure relief back pressure valve 11. This valve is a back pressure valve. When the pressure in the closed chamber 2 reaches the set value, the pressure relief back pressure valve 11 automatically opens and connects to the downstream pipeline to start pressure relief. When the downstream pipeline is a discharge pipeline and is determined to be in a pressure-free state, the valve may not be installed.

[0026] The water hammer arrester body consists of a valve interface (inlet pipeline), a valve body, a piston 4, a spring 3, a sealing ring (installed on the piston, if the piston itself has a seal, the piston can also be used directly instead), a flange 8 and matching bolts 6, nuts 7 and a pressure relief port (outlet pipeline). The inner cavity of the valve body 1 is divided into two by the piston 4, the upper part is a low-pressure closed chamber 2, and the lower part is a high-pressure open chamber 5. When the system is under normal pressure, the piston 4 is located under the pressure relief port (outlet pipeline), and the upper part is a low-pressure closed chamber 2 connected to the pressure relief port (outlet pipeline). A spring 3 is arranged between the valve body 1 and the piston 4. The lower part of the valve body 1 is connected to the flange 8 by bolts 6 and nuts 7. The bottom of the valve body 1 is connected to the inlet stop valve 9, and the side of the valve body 1 is connected to the pressure relief back pressure valve 11. A pump 10 is arranged between the inlet stop valve 9 and the pressure relief back pressure valve 11.

[0027] There is a low-pressure closed chamber 2 inside the water hammer arrester, and a piston 4 is at the lower end. When the shock wave enters the water hammer arrester, the water hammer wave acts on the piston 4, converting the pressure energy of the water hammer into the elastic potential energy of the spring, and the piston moves upward toward the low-pressure closed chamber 2. The stroke of the piston 4 is related to the size of the water hammer wave. When the water hammer pressure is small, the pipeline pressure can be effectively adjusted through the piston 4 and the spring 3 without discharging the upstream medium through the pressure relief port (export pipeline). When the water hammer pressure is large, the spring 3 is compressed and deformed greatly, the piston 4 moves upward to the top of the pressure relief port (export pipeline), and the high-pressure open chamber 5 is connected to the pressure relief port (export pipeline). The system removes the excess medium pressure through the pressure relief port (export pipeline), protecting the system and pipe fittings from the influence of high-pressure water hammer. After the pressure is reduced, the piston 4 moves downward to the bottom of the pressure relief port (export pipeline), and the high-pressure open chamber 5 is disconnected from the pressure relief port (export pipeline). The system no longer discharges the medium, and adjusts the pipeline system pressure through the piston and the spring, and finally reaches the system pressure balance.

[0028] This water hammer arrester has a wide working range and can work under low pressure and high pressure water hammer conditions:

[0029] When the water hammer pressure is small, under the dual action of the spring and irregular water hammer, the piston converts the pressure energy of the water hammer into the elastic potential energy of the spring, moves up and down, and continuously converts between the pressure energy of the water and the elastic potential energy of the spring, forming a dynamic balance, which can eliminate irregular water hammer wave oscillations, greatly reduce the pressure of the water hammer, and protect the pipeline system and related equipment.

[0030] When the water hammer pressure is large, the pressure energy of the water hammer is converted into the elastic potential energy of the spring. The spring is greatly compressed, causing the piston to move upward to the pressure relief port, so that the pressure relief port is connected to the high-pressure open cavity at the bottom of the water hammer eliminator piston. High-pressure water is discharged from the high-pressure side to the low-pressure side through the pressure relief channel, forming a bypass pipeline for valves and other protected equipment, reducing the peak pressure and not re-transmitting the pressure back into the system, protecting the pressure-sensitive protected equipment in the system. When the system pressure is reduced to the pressure relief pressure, the piston moves downward to the pressure relief port, the high-pressure open cavity and the low-pressure discharge pipeline are cut off, and the piston enters the low-pressure water hammer working condition. Under the dual effects of the elastic potential energy of the spring and the irregular water hammer pressure energy, the piston moves up and down to form a dynamic balance, eliminating irregular water hammer wave oscillations. Until the system pressure is stable.

[0031] The water hammer arrester is generally installed in front of single-handle faucets, ball valves, gate valves, pumps and other equipment that are prone to water hammer. It is connected in parallel with the main pipeline through welding or flanges. Its installation position can be vertical, horizontal or inverted.

Claims

1. A damping device for eliminating water hammer, characterized in that: The inner cavity of the valve body is divided into two parts by the piston, the upper part is a low-pressure closed cavity, and the lower part is a high-pressure open cavity. A spring is arranged between the valve body and the piston. The bottom of the valve body is connected to an inlet stop valve, and the side of the valve body is connected to a pressure relief back pressure valve. A pump is arranged between the inlet stop valve and the pressure relief back pressure valve.

2. The damping device for eliminating water hammer according to claim 1, characterized in that: The lower part of the valve body is connected to the flange by bolts and nuts.

3. The damping device for eliminating water hammer according to claim 1, characterized in that: When the shock wave is transmitted, the water hammer wave acts on the piston, converting the pressure energy of the water hammer into the elastic potential energy of the spring, and the piston moves upward toward the low-pressure closed cavity.

4. The damping device for eliminating water hammer according to claim 3, characterized in that: When the water hammer pressure is small, the pipeline pressure can be effectively adjusted through the piston and spring.

5. The damping device for eliminating water hammer according to claim 3, characterized in that: When the water hammer pressure is large, the spring is compressed and deformed greatly, the piston moves upward to the top of the pressure relief back pressure valve, the high-pressure opening chamber is connected to the pressure relief back pressure valve, and the excess medium pressure is discharged through the pressure relief back pressure valve. After the pressure is reduced, the piston moves downward to the bottom of the pressure relief back pressure valve, the high-pressure opening chamber is disconnected from the pressure relief back pressure valve, and the medium is no longer discharged. Instead, the pipeline pressure is adjusted by the piston and spring to finally reach pressure balance.

6. The damping device for eliminating water hammer according to claim 3, characterized in that: When the water hammer pressure is small, under the dual action of the spring and irregular water hammer, the piston converts the pressure energy of the water hammer into the elastic potential energy of the spring, moves up and down, and continuously converts between the pressure energy of the water and the elastic potential energy of the spring, forming a dynamic balance, which can eliminate irregular water hammer wave oscillations, greatly reduce the pressure of the water hammer, and protect the pipeline system and related equipment.

7. The damping device for eliminating water hammer according to claim 3, characterized in that: When the water hammer pressure is large, the pressure energy of the water hammer is converted into the elastic potential energy of the spring. The spring is greatly compressed, causing the piston to move upward onto the pressure relief back pressure valve, so that the pressure relief back pressure valve is connected to the high-pressure opening chamber, and the high-pressure water is discharged from the high-pressure side to the low-pressure side through the pressure relief back pressure valve, forming a bypass pipeline for the protected equipment, reducing the peak pressure without retransmitting the pressure back, and protecting the pressure-sensitive equipment in the system; when the pressure is reduced to the pressure relief pressure, the piston moves downward to the pressure relief back pressure valve, the high-pressure opening chamber is isolated, and the piston enters the low-pressure water hammer working condition. Under the dual action of the elastic potential energy of the spring and the irregular water hammer pressure energy, the piston moves up and down, forming a dynamic balance, eliminating irregular water hammer wave oscillations until the pressure is stable.

8. The damping device for eliminating water hammer according to claim 1, characterized in that: The device is installed in front of single-handle faucets, ball valves, gate valves, and pumps.

9. The damping device for eliminating water hammer according to claim 1, characterized in that: The device can be installed vertically, horizontally or inverted.

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