Test device for simulating water hammer characteristics of check valve

Abstract

The utility model relates to a valve characteristic test, and particularly discloses a test device for simulating the water hammer characteristic of a check valve, which comprises a valve body, the valve body is connected with an inlet pipe and an outlet pipe, a valve plate is arranged in the valve body, the valve plate is rotatably connected in the valve body, and when water flow flows from the inlet pipe to the outlet pipe, the water hammer characteristic of the check valve is simulated. Water flow can drive the valve plate to rotate so as to cover the pipe opening part of the outlet pipe, and when the water flow flows from the outlet pipe to the inlet pipe, the water flow can drive the valve plate to rotate so as to open the pipe opening part of the outlet pipe; the valve body is further provided with a limiting stopper, and the limiting stopper can limit rotation of the valve plate at one position where the valve plate opens the outlet pipe so as to keep the opening state of the valve plate. And the inlet pipe is also connected with a water flow supply system. The test device for simulating the water hammer characteristics of the check valve is simple in structure, low in test cost and good in accuracy.

Description

Technical Field

[0001] The utility model relates to the technical field of valve testing, in particular to a test device for simulating water hammer characteristics of a check valve. Background Art

[0002] Water hammer is a common occurrence in pipeline transportation systems. Due to the inertia and compressibility of fluids, when a sudden external stimulus causes a dramatic change in the flow velocity within the pipe, triggering momentum exchange within the fluid, the fluid's pressure and density also experience a sharp increase and decrease, alternating between rise and fall. This generates a water hammer wave that propagates rapidly along the pipe at a constant velocity. Numerous factors can trigger water hammer in the circuit systems of nuclear power plants, with pump-off water hammer being a particularly serious one. Pump-off water hammer occurs when a main pump suddenly stops due to an unexpected power outage or mechanical failure, leading to fluid backflow in the pipe system and the rapid closure of the check valve downstream of the pump. This type of water hammer can potentially lead to major accidents such as pipeline rupture or flooding of the nuclear power plant pump room, potentially causing coolant loss and deteriorating core heat transfer, seriously impacting the safe operation of the reactor system. Experimental measurement of the check valve disc closing speed, water hammer pressure wave magnitude, and propagation velocity during backflow is a key method for studying pump-off water hammer. However, due to the large and complex nature of actual pipelines and the numerous influencing factors, measuring check valve water hammer is difficult and expensive. Utility Model Content

[0003] The purpose of the utility model is to provide a test device for simulating the water hammer characteristics of a check valve, which can use a simple test device to simulate the state of the check valve when water hammer occurs, thereby providing data for analyzing its water hammer characteristics.

[0004] The utility model is achieved through the following technical solutions:

[0005] A test device for simulating water hammer characteristics of a check valve, comprising a valve body connected to an inlet pipe and an outlet pipe, a valve plate disposed in the valve body, the valve plate being rotatably connected to the valve body, such that when water flows from the inlet pipe to the outlet pipe, the water flow can drive the valve plate to rotate to cover the orifice of the outlet pipe, and when water flows from the outlet pipe to the inlet pipe, the water flow can drive the valve plate to rotate to open the orifice of the outlet pipe;

[0006] The valve body is also provided with a limiter, which can limit the rotation of the valve plate at one of the positions where the valve plate opens the outlet pipe, so as to keep the valve plate in an open state;

[0007] The inlet pipe is also connected to a water supply system.

[0008] Optionally, the water supply system includes a water tank, which is connected to the inlet pipe through a pipeline. A stop valve is also provided on the pipeline between the water tank and the inlet pipe. The water tank is arranged at a position higher than the valve body.

[0009] Optionally, the limiter is a rod-shaped component that can move in a straight line, one end of the rod-shaped component extends outside the valve body, and the other end can be inserted into the rotation path of the valve plate to limit the rotation of the valve plate.

[0010] Optionally, an L-shaped structure is provided at one end outside the valve body of the rod-shaped component.

[0011] Optionally, one end of the rod-shaped component outside the valve body is connected to a linear drive mechanism.

[0012] Optionally, an observation window is provided on the valve body on one side of the valve plate rotation path.

[0013] Optionally, a control rod capable of driving the valve plate to rotate is connected to the rotation axis of the valve plate and the valve body, and the control rod extends outside the valve body.

[0014] The technical solution of the utility model has at least the following beneficial effects:

[0015] The test device of the utility model for simulating the water hammer characteristics of a check valve can provide water flow through a water flow supply system, and cooperates with a limiter that can control the closing of a valve plate. The limiter can be opened when the water flow speed is stable. The valve plate closes the outlet pipe under the drive of the water flow, forming a water hammer, so that accurate check valve water hammer test data can be obtained. The test device of the utility model has a simple structure, low test cost and high test accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural diagram of a test device for simulating water hammer characteristics of a check valve according to the present invention;

[0017] Figure 2 This is a schematic diagram of the test device for simulating water hammer characteristics of a check valve according to the present invention, when the valve plate is open;

[0018] Figure 3 for Figure 1 AA section view.

[0019] Reference numerals: 1 - water tank, 2 - stop valve, 3 - inlet pipe, 4 - valve body, 5 - limiter, 6 - observation window, 7 - valve plate, 8 - outlet pipe. DETAILED DESCRIPTION

[0020] Reference Figure 1-3The test device for simulating the water hammer characteristics of a check valve of the present invention includes a valve body 4, which is connected to an inlet pipe 3 and an outlet pipe 8. A valve plate 7 is provided in the valve body 4, and the valve plate 7 is rotatably connected to the valve body 4. When water flows from the inlet pipe 3 to the outlet pipe 8, the water flow can drive the valve plate 7 to rotate to cover the pipe opening of the outlet pipe 8. When water flows from the outlet pipe 8 to the inlet pipe 3, the water flow can drive the valve plate 7 to rotate to open the pipe opening of the outlet pipe 8.

[0021] The inlet pipe 3 is also connected to a water supply system, which includes a water tank 1. The water tank 1 is connected to the inlet pipe 3 through a pipeline. A stop valve 2 is also provided on the pipeline between the water tank 1 and the inlet pipe 3. The water tank 1 is arranged at a position higher than the valve body 4, thereby providing a water flow with a certain initial velocity. The high-position arrangement eliminates the need for a water pump, making the entire device simpler. If the test requires different water flow rates, the water tank 1 can be arranged on a bracket through a height adjustment mechanism. By adjusting the height of the water tank 1, water flows of different flow rates can be obtained. The height adjustment mechanism can adopt a conventional slide rail and limit pin combination. The water tank 1 can be moved along the slide rail to adjust the height, and then locked at a specific height by the limit pin. Due to the different heights of the water tank 1, the initial kinetic energy obtained is different, and the water flow rate is different.

[0022] A limiter 5 is also provided on the valve body 4. The limiter 5 can limit the rotation of the valve plate 7 at one of the positions where the valve plate 7 opens the outlet pipe 8, so as to maintain the open state of the valve plate 7. In this embodiment, the limiter 5 is a rod-shaped component that can move in a straight line. One end of the rod-shaped component extends to the outside of the valve body 4, and the other end can be inserted into the rotation path of the valve plate 7 to limit the rotation of the valve plate 7. In order to facilitate the insertion of the rod-shaped component, a corresponding socket is provided on the valve plate 7, which can be quickly matched to achieve limiting. An L-shaped structure is provided at one end outside the valve body 4 of the rod-shaped component, which can facilitate manual pulling of the limiter 5 to separate it from the valve plate 7. Driven by the water flow, the valve plate 7 can rotate around its rotating axis and move to a position covering the outlet pipe 8. Of course, the end outside the valve body 4 of the rod-shaped component can also be connected to a linear drive mechanism, such as an electric rod, a cylinder, etc., and any mechanism that can achieve linear movement is acceptable.

[0023] In order to conveniently obtain the motion state data of the valve plate 7 , an observation window 6 may be provided on the valve body 4 on one side of the rotation path of the valve plate 7 , and a high-speed camera is arranged outside the observation window 6 to capture the motion process of the valve plate 7 .

[0024] A control rod (not shown) that can drive the valve plate 7 to rotate is connected to the rotating shaft of the valve body 4 and extends to the outside of the valve body 4. Through the control rod, after an experiment is completed, the valve plate 7 can be controlled to rotate outside the valve body 4 to return to the position of opening the outlet pipe 8, and then the limiter 5 can be controlled to move to lock the valve plate 7 and wait for the valve plate 7 to be opened in the next experiment.

[0025] The test device for simulating water hammer characteristics of a check valve of the utility model mainly includes the following steps:

[0026] First, adjust the water level in the water tank 1. If you need to study the movement of the valve plate 7 under a certain flow rate, before each test, keep the water level in the water tank 1 constant. Then open the stop valve 2, and the water in the water tank 1 will flow into the valve body 4 through the inlet pipe 3. After the water flow stabilizes, control the limiter 5 to move, thereby releasing the restriction on the valve plate 7. Under the guidance of the water flow, the valve plate 7 closes the outlet pipe 8. At this time, water hammer will be generated. Measure the pressure of the water hammer and use a high-speed camera to shoot the movement of the valve plate 7. The pressure test of the water hammer can be detected by arranging sensors at the corresponding position in the valve body 4. After the test is completed, close the stop valve 2, readjust the water level in the high-level water tank 1, pull up the valve plate 7 through the control rod, move the limiter 5 to restrict the valve plate 7, and then carry out subsequent other working condition tests.

[0027] The utility model discloses a test device for simulating water hammer characteristics of a check valve, has a simple structure, and can realize a low-cost water hammer characteristic test of the check valve.

Claims

1. A test device for simulating the water hammer characteristics of a check valve, comprising a valve body connected to an inlet pipe and an outlet pipe, a valve plate disposed within the valve body, the valve plate being rotatably connected within the valve body. When water flows from the inlet pipe to the outlet pipe, the water flow drives the valve plate to rotate to cover the orifice of the outlet pipe. When water flows from the outlet pipe to the inlet pipe, the water flow drives the valve plate to rotate to open the orifice of the outlet pipe. It is characterized by: The valve body is also provided with a limiter, which can limit the rotation of the valve plate at one of the positions where the valve plate opens the outlet pipe, so as to keep the valve plate in an open state; The inlet pipe is also connected to a water supply system.

2. The test device for simulating water hammer characteristics of a check valve according to claim 1, characterized in that: The water supply system includes a water tank, which is connected to an inlet pipe through a pipeline. A stop valve is also provided on the pipeline between the water tank and the inlet pipe. The water tank is arranged at a position higher than the valve body.

3. The test device for simulating water hammer characteristics of a check valve according to claim 1, characterized in that: The limiter is a rod-shaped component that can move in a straight line. One end of the rod-shaped component extends outside the valve body, and the other end can be inserted into the rotation path of the valve plate to limit the rotation of the valve plate.

4. The test device for simulating water hammer characteristics of a check valve according to claim 3, characterized in that: An L-shaped structure is provided at one end of the rod-shaped component outside the valve body.

5. The test device for simulating water hammer characteristics of a check valve according to claim 3, characterized in that: One end of the rod-shaped component outside the valve body is connected to a linear drive mechanism.

6. The test device for simulating water hammer characteristics of a check valve according to claim 1, characterized in that: An observation window is provided on the valve body on one side of the valve plate rotation path.

7. The test device for simulating water hammer characteristics of a check valve according to claim 1, characterized in that: A control rod capable of driving the valve plate to rotate is connected to the rotation axis of the valve plate and the valve body, and the control rod extends out of the valve body.

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