Water hammer eliminating device for long-distance high-pressure pump station
By using a combination of a counterweight slow-closing check valve and a safety relief valve in long-distance high-pressure pumping stations, the water hammer effect during pump start-up and shutdown was solved, improving system stability and safety and reducing maintenance costs.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-10
- Publication Date
- 2026-03-24
AI Technical Summary
In long-distance high-pressure pumping stations, the water hammer effect generated when the pumps start and stop can lead to pipe rupture, equipment damage, system vibration, and safety risks. Existing solutions are either too costly or too complex to be effectively applied in unattended pumping stations.
The system employs a combination design of a counterweight slow-closing check valve and a safety relief valve. The counterweight slow-closing check valve prevents water backflow and automatically closes when the water pump stops. The safety relief valve is activated to release pressure under high pressure. Combined with pressure sensors and flow meters to monitor the system status, the water hammer effect is eliminated.
It effectively reduces the damage to pipes and equipment caused by water hammer, improves the safety and stability of the water supply system, reduces the frequency of maintenance and equipment replacement, and reduces maintenance costs.
Smart Images
Figure CN224031796U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a long distance high pressure pump station water hammer elimination device belongs to energy -conserving and environment -protecting technical field. BACKGROUND
[0002] Water pump station as the key link of water supply system, bears the main task of lifting, conveying and distributing water source. The traditional water pump station includes water suction pool, water pump, valve and water supply pipe etc. component, for extracting water source from water suction pool and conveying to user through water pump pressurization. In the operation of water supply system, the sudden opening or closing of water pump can cause the dramatic change of water flow velocity in pipeline, and this sudden change of water flow velocity can produce water hammer effect. In order to eliminate or weaken water hammer effect, the existing solution usually includes prolonging the valve opening and closing time, excluding the excess air in pipeline, installing water hammer eliminator etc. method, but these measures often due to complex structure, high cost, design requirement or actual situation of site environment, lead to application limited.
[0003] The harm of water hammer effect mainly shows as: (1) pipeline rupture: high pressure can cause great stress on the wall surface of pipeline, exceed the bearing capacity of pipeline, cause pipeline rupture. (2) equipment damage: valve and pump etc. equipment can be damaged under high pressure or low pressure, even cause equipment failure. (3) system vibration: the repeated change of pressure can cause the vibration of pipeline and equipment, can cause pipeline joint to disconnect or equipment damage. (4) safety risk: in extreme case, water hammer effect can cause pump house to be flooded, cause major accident.
[0004] Nowadays, the newly built pump station is mostly unattended pump station, and some pump house systems have the condition that the water supply terminal is far away from the water supply point of water pump in pump house, or has a height difference of hundreds of meters. In order to realize the effect of long distance transportation, the lift of water pump needs to be selected to be larger, in order to prevent high pressure water backflow, protect water pump and driving motor, ensure the safe operation of system, therefore check valve needs to be installed at the outlet of water pump, but the ordinary check valve in high lift water pump working environment, pump starting and stopping can produce great impact force, the service life can be greatly reduced, and the valve can not be normally closed after a long time, which can bring great hidden danger to the safety of pump station system. UTILITY MODEL CONTENTS
[0005] In order to eliminate or weaken water hammer effect, the utility model provides a long distance high pressure pump station water hammer elimination device.
[0006] This invention targets long-distance high-pressure pumping stations, specifically unmanned stations where electric valves are used for remote control of frequently opened and closed valves, and where the water supply point is far from the pump house, requiring pumps with a large head for long-distance water transport. Based on the project's characteristics and actual site conditions, this technology employs a dual water hammer elimination design, combining a counterweight slow-closing check valve and a safety pressure relief valve, to reduce the adverse effects of water hammer on the system, ensure system stability, and extend equipment lifespan.
[0007] This utility model provides a water hammer elimination device for long-distance high-pressure pumping stations, including a suction tank and a main water supply pipe. The suction tank is equipped with several parallel water pump branch pipes according to design requirements. Each water pump branch pipe has the same design. An electric gate valve is installed on the suction pipe between the suction tank and the water pump. A pressure sensor, a counterweight slow-closing check valve, a second electric gate valve, and a manual gate valve are sequentially installed between the water pump outlet and the main water supply pipe. The pressure sensor measures the water pump's outlet pressure. The counterweight slow-closing check valve prevents backflow and eliminates the water hammer effect. The second electric gate valve opens when the water pump starts and closes when the water pump stops working. The manual gate valve is normally open and closes only when the water pump pipeline needs maintenance, without affecting the operation of other water pump pipeline systems. A safety pressure relief branch pipe is installed on the main water supply pipe, flowing back to the pump room's suction tank, and a safety pressure relief valve is installed on the safety pressure relief branch pipe.
[0008] Furthermore, the starting pressure of the safety relief valve is slightly higher than the water supply pressure of the pump room system. When the water pump stops running, the instantaneous high pressure of shutting off the pump will activate the relief valve, which will eliminate water hammer. The safety relief branch pipe also serves as a return water pipe, returning part of the water from the main pipe to the suction pool through the safety relief pipe.
[0009] Furthermore, a level gauge is installed inside the water absorption tank.
[0010] Furthermore, the main water supply pipe is equipped with a pressure sensor and a flow meter, which can measure the total flow and pressure of the main water supply system and, in conjunction with the pressure values of each water pump branch pipe, determine whether there is a fault in the pump room system.
[0011] The water hammer elimination device for long-distance high-pressure pumping stations provided by this utility model has the following beneficial effects:
[0012] This water hammer elimination device has a simple structure and is easy to install. It can not only effectively reduce the damage of water hammer effect to equipment such as pipes, valves and water pumps, but also improve the safety and stability of the water supply system, reduce the frequency of maintenance and equipment replacement, and reduce maintenance costs.
[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments. Attached Figure Description
[0014] Figure 1The utility model discloses a structure schematic view.
[0015] In the drawing: 1 is water suction pool, 2 is water supply main pipe, 3 is water pump branch line, 4 is water pump, 5 is electric gate valve, 6 is pressure sensor, 7 is heavy hammer type slow closing check valve, 8 is second electric gate valve, 9 is manual gate valve, 10 is safety pressure relief branch, 11 is safety pressure relief valve, 12 is liquid level meter, 13 is flowmeter. DETAILED DESCRIPTION EMBODIMENT
[0016] As Figure 1 The utility model provides a long distance high pressure pump station water hammer elimination device, including water suction pool 1 and water supply main pipe 2, water suction pool 1 connects four water pump branch lines 3, and each water pump branch line 3 is designed same, and the water suction line between water suction pool 1 and water pump 4 is equipped with electric gate valve 5, and the water outlet of water pump is sequentially provided with pressure sensor 6, heavy hammer type slow closing check valve 7, second electric gate valve 8, manual gate valve 9 between water supply main pipe 2, and one safety pressure relief branch 10 is arranged on water supply main pipe 2 and returns to pump house water suction pool 1, and is equipped with safety pressure relief valve 11 on safety pressure relief branch 10.
[0017] Further, the starting pressure of the safety pressure relief valve 11 is slightly higher than the water supply pressure of the pump house system, and when the water pump stops running, the instantaneous high pressure when the pump is closed will activate the safety pressure relief valve 11, thereby eliminating water hammer effect, and the safety pressure relief branch 10 simultaneously serves as a water return pipe to return part of the water in the main pipe to the water suction pool 1 through the safety pressure relief pipe.
[0018] Further, the water suction pool 1 is provided with a liquid level meter 12.
[0019] Further, the water supply main pipe 2 is provided with a pressure sensor and a flowmeter to measure the total flow and total pressure of the water supply system main pipe, and in combination with the pressure value of each water pump branch line, to determine whether the pump house system has a fault.
[0020] The operation process of the long distance high pressure pump station water hammer elimination device of the utility model will be further described below in combination with the drawings:
[0021] As Figure 1 shown: water suction pool 1 receives water from upstream, and a liquid level meter 12 is arranged in the pool, when the liquid level is higher than a certain value, the working pump in the system starts to supply water to the water supply point, and when the liquid level is lower than a certain value, the water pump is closed to stop water supply.
[0022] As the four water pumps 4 and the water pump branch pipes 3 are designed identically, taking the first water pump as an example, an electric gate valve 5 is arranged on the water suction pipe between the water suction pool 1 and the water pump 4, and the electric gate valve 5 is in a normally open state. A pressure sensor 6, a heavy hammer type slow closing check valve 7, a second electric gate valve 8 and a manual gate valve 9 are sequentially arranged between the water outlet of the water pump 4 and the water supply main pipe 2. The pressure sensor 6 can measure the water outlet pressure of the water pump; the heavy hammer type slow closing check valve 7 prevents water backflow and eliminates water hammer effect; the second electric gate valve 8 is opened when the water pump starts and is closed when the water pump stops working; and the manual gate valve 9 is in a normally open state and is closed when the water pump pipeline needs to be repaired, without affecting the operation of other water pump pipeline systems.
[0023] A safety pressure relief branch pipe 10 is arranged on the water supply main pipe 2 and returns to the pump house pool, and a safety pressure relief valve 11 is arranged on the safety pressure relief branch pipe 10. The starting pressure of the pressure relief valve is slightly higher than the water supply pressure of the pump house system. When the water pump stops running, the instantaneous high pressure when the pump is closed can make the pressure relief valve work and activate, which can eliminate water hammer effect and can also serve as a water return pipeline to return part of the water in the main pipe to the pool through the safety pressure relief pipe.
[0024] A pressure sensor and a flow meter 13 are arranged on the water supply main pipe 2, which can measure the total flow and total pressure of the water supply system main pipe, and can judge whether the pump house system has a fault in combination with the pressure values of each water pump branch pipe.
[0025] In order to eliminate the water hammer effect generated when the system starts and stops the pump, the heavy hammer type slow closing check valve 7 is arranged on the water pump branch pipe 3. In the design of the pump station, the pump port check valve device can be selected from the ordinary slow closing check valve and the heavy hammer type slow closing check valve. The technical personnel compares the two devices and confirms that the ordinary slow closing check valve realizes the slow closing of the valve clack through hydraulic or mechanical devices, thereby reducing the water hammer effect and being suitable for various media and complex working conditions, but the structure is relatively complex and the maintenance requirement is relatively high. The heavy hammer type slow closing check valve realizes the slow closing function by using a heavy hammer. When the pump starts, the water flow pushes the valve clack to open, and the heavy hammer rises with the valve clack. When the water pump is closed, the heavy hammer falls under the action of gravity and slowly closes the valve clack, thereby eliminating the water hammer effect. The heavy hammer type slow closing check valve has a relatively simple structure and is convenient to maintain, and is mainly suitable for high-pressure and large-diameter pipelines. Considering that the water is a single medium in the project and the working condition is not complex, a water pump with high lift and a water supply main pipe with large diameter are selected. According to the analysis of various factors, the selection of the heavy hammer type slow closing check valve meets the design of the project, so the heavy hammer type slow closing check valve is selected and arranged in the design to eliminate the water hammer effect generated when the pump is closed.
[0026] When the water hammer effect occurs, the instantaneous pressure generated will be much larger than the working pressure of the water pump in normal operation, and over time, it will also affect the service life of the heavy hammer type slow closing check valve. Therefore, a branch pipe (i.e. a safety pressure relief branch pipe) is designed to extend from the water supply main pipe, the branch pipe is connected back to the pump house water tank, and a safety pressure relief valve is provided on the branch pipe. The working pressure of the pressure relief valve is slightly higher than the working pressure of the water pump, which allows the excess water to flow back to the suction tank through the pressure relief pipe when the pressure in the water supply main pipe abnormally increases, thereby reducing the system pressure. When the water pump is shut down, part of the water hammer is eliminated by the heavy hammer type slow closing check valve, and at the same time, under the high pressure of the water hammer, the safety pressure relief valve can be automatically opened, and the water in the pipe can flow back to the pump house water tank through the pressure relief pipe, thereby simultaneously eliminating part of the water hammer, prolonging the service life of the check valve, and allowing the water in the main pipe to flow back to the pump house water tank from the pressure relief pipe without the need to set up a separate water return pipe, thereby achieving normal operation of the pump house system, maintaining the stability of the pump house system, saving pipe material resources, and the like.
[0027] The water hammer eliminating device provided by the utility model has simple structure and is convenient to install, can effectively reduce the damage of water hammer effect to pipes, valves, water pumps and other equipment, can improve the safety and stability of the water supply system, can reduce the frequency of maintenance and equipment replacement, and can reduce maintenance cost.
Claims
1. A long distance high pressure pump station water hammer elimination device, comprising a water suction pool and a water supply main pipe, characterized in that: The suction pool is connected with several water pump branch lines, each of which is designed identically, and an electric gate valve is arranged on the suction pipe between the suction pool and the water pump; a pressure sensor, a heavy hammer type slow closing check valve, a second electric gate valve and a manual gate valve are arranged in sequence between the water outlet of the water pump and the water supply main pipe; the pressure sensor is used for measuring the water outlet pressure of the water pump; the heavy hammer type slow closing check valve prevents water backflow and eliminates water hammer influence; the second electric gate valve is opened when the water pump starts and is closed when the water pump stops working; the manual gate valve is in a normal open state and is closed when the water pump line needs to be repaired, without affecting the operation of other water pump line systems; a safety pressure relief branch line is arranged on the water supply main pipe and returns to the pump house suction pool, and a safety pressure relief valve is arranged on the safety pressure relief branch line.
2. The long distance high pressure pump station water hammer elimination device according to claim 1, characterized in that: The starting pressure of the safety pressure relief valve is slightly higher than the water supply pressure of the pump house system, and when the water pump stops running, the instantaneous high pressure when the pump is closed will activate the pressure relief valve to work, thereby eliminating water hammer; the safety pressure relief branch line simultaneously serves as a water return pipe to return part of the water in the main pipe to the suction pool through the safety pressure relief pipe.
3. The long distance high pressure pump station water hammer elimination device according to claim 1, characterized in that: A liquid level meter is arranged in the suction pool.
4. The long distance high pressure pump station water hammer elimination device according to claim 1, characterized in that: A pressure sensor and a flow meter are arranged on the water supply main pipe to measure the total flow and total pressure of the water supply system main pipe, and in combination with the pressure value of each water pump branch line, whether the pump house system has a fault is judged.