Separated water hammer elimination box performance test device

Abstract

The utility model relates to a test device for testing the performance of a separated water hammer eliminating box. The utility model is applicable to the technical field of water hammer protection in water conservancy and hydropower engineering. According to the technical scheme, a first water tank is provided with a first water level adjusting mechanism; the second water tank is provided with a second water level adjusting mechanism; the water conveying pipeline is provided with a main pipeline and at least two secondary pipelines with different lengths, the first end of the main pipeline is communicated with the second water tank, the second end of the main pipeline is communicated with the first ends of the secondary pipelines, and the second ends of the secondary pipelines are jointly communicated with the first water tank through a flow adjusting valve; the main pipeline is provided with a main water pump, a pneumatic valve and a four-way pipe, the third end of the four-way pipe is communicated with the separated water hammer eliminating mechanism through a fourth valve, and the fourth end of the four-way pipe is communicated with water hammer protection equipment through a fifth valve; each secondary pipeline is provided with a valve; the separated water hammer eliminating mechanism comprises a water hammer eliminating box main tank, an inverted-U-shaped connecting pipe and a separated air tank.

Description

Technical Field

[0001] The utility model relates to a performance test device for a detachable water hammer elimination box, which is applicable to the field of water hammer protection in water conservancy and hydropower projects. Background Art

[0002] In order to ensure the safety and reliability of the performance of water hammer protection equipment, each new type of water hammer protection equipment needs to be evaluated for its water hammer protection performance after it is proposed to verify its water hammer protection performance in water transmission systems with different heads and different water transmission distances. Only after confirming that the protection performance is qualified can it be put into production and use.

[0003] When the pump loses power, negative water hammer will occur in the water supply pipeline. Turning off the pump valve will cause a larger positive water hammer, resulting in a large pressure differential between the inside and outside of the pipeline. In severe cases, it may cause accidents such as pipe bursts, endangering the lives of test personnel. Therefore, it is necessary to evaluate the water hammer protection performance of the equipment from multiple theoretical perspectives, but there is currently a lack of relevant performance testing equipment. Utility Model Content

[0004] The technical problem to be solved by the utility model is: in view of the above-mentioned problems, a performance test device for a separate water hammer elimination box is provided.

[0005] The technical solution adopted by the utility model is: a separate water hammer elimination box performance test device, characterized by comprising:

[0006] The first water tank is equipped with a first water level regulating mechanism capable of maintaining the water level in the first water tank at a preset first water level;

[0007] The second water tank is equipped with a second water level regulating mechanism capable of maintaining the water level in the second water tank at a preset second water level;

[0008] a water delivery pipeline having a main pipeline and at least two secondary pipelines of different lengths, wherein a first end of the main pipeline is connected to the second water tank, a second end of the main pipeline is connected to the first end of each secondary pipeline, and the second end of each secondary pipeline is connected to the first water tank via a flow regulating valve;

[0009] The main pipe is equipped with a main water pump, a pneumatic valve and a four-way pipe. The third end of the four-way pipe is connected to the separate water hammer elimination mechanism through the fourth valve, and the fourth end of the four-way pipe is connected to the water hammer protection device through the fifth valve. Valves are installed on each secondary pipe.

[0010] The separate water hammer elimination mechanism includes a water hammer elimination box main tank, an inverted U-shaped connecting pipe and a separate air tank, wherein the first end of the inverted U-shaped connecting pipe is connected to the water hammer elimination box main tank via an air valve and a first bellows, and the second end of the inverted U-shaped connecting pipe is connected to the separate air tank via a second bellows.

[0011] The first water level regulating mechanism comprises:

[0012] Return water tank;

[0013] a first water supply pump, disposed between the return water tank and the first water tank, for pumping water in the return water tank into the first water tank;

[0014] The first overflow pipe is connected to the return water tank and the first water tank. When the water in the first water tank exceeds a preset first water level, the water flows into the return water tank through the first overflow pipe.

[0015] The second water level regulating mechanism comprises:

[0016] Return water tank;

[0017] a second water supply pump, disposed between the return water tank and the second water tank, for pumping water in the return water tank into the second water tank;

[0018] The second overflow pipe is connected to the return water tank and the second water tank. When the water in the second water tank exceeds a preset second water level, the water flows into the return water tank through the second overflow pipe.

[0019] The at least two secondary pipelines of different lengths include:

[0020] a first pipeline, a first end of which is connected to the second end of the main pipeline, and a second end of which is connected to the flow regulating valve, and a first valve is installed on the first pipeline;

[0021] a second pipeline, a first end of which is connected to the first pipeline, a second end of which is connected to the flow regulating valve, and a second valve is installed on the second pipeline;

[0022] The third pipeline has a first end connected to the second pipeline and a third end connected to the flow regulating valve. A third valve is installed on the third pipeline.

[0023] The air valve comprises:

[0024] The lower valve body has a valve body chamber therein, and the lower end of the valve body chamber is provided with an air and water inlet;

[0025] A guide cylinder is disposed in the valve body cavity, wherein the lower end of the guide cylinder has at least one through hole, and the upper end of the guide cylinder is open and exposed on the upper end surface of the lower valve body;

[0026] A float ball is placed in the guide cylinder and has a diameter smaller than the inner diameter of the guide cylinder;

[0027] A positioning block is provided at the bottom of the guide cylinder and is used to support the float;

[0028] The upper valve body can be assembled with the lower valve body, and the upper end of the upper valve body is provided with an air inlet and an air outlet;

[0029] The limit sleeve is arranged in the upper valve body, and its lower end can be connected with the guide cylinder when the upper and lower valve bodies are assembled, and its upper end is connected to the air inlet and exhaust ports. The inner diameter of the lower end of the limit sleeve is adapted to the inner diameter of the guide cylinder. The inner diameter of the limit sleeve gradually decreases from the lower end to the upper end and is adapted to the shape of the float.

[0030] A test method based on the test device, characterized in that:

[0031] S1. Open the fourth valve, close the fifth valve, open the valve corresponding to the shortest secondary pipeline, and close the valves corresponding to the remaining secondary pipelines;

[0032] S2. Check whether the water pump, flow regulating valve, and pneumatic valve are in normal condition; check whether the data acquisition system is working properly; check whether the water level in the main tank of the water hammer elimination box and the air pressure in the separate air tank have reached the set value;

[0033] S3. Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the first water tank level gauge, the second water tank level gauge, the main water pump speed sensor, and the main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0034] S4. Cut off the power to the main water pump and the pneumatic pump behind it. Record the main water pump speed, main line flow, main line pressure, the liquid level, pressure and temperature of the main tank of the water hammer elimination box, the pressure and temperature of the separate air tank, and the changes in gas flow.

[0035] S5. Repeat the test three times to ensure the accuracy and repeatability of the test data;

[0036] S6. Adjust the opening and closing of valves on each pipeline and switch the length of the water pipeline;

[0037] S7. Repeat steps S2 to S5.

[0038] A test method based on the test device, characterized in that:

[0039] S1. Open the fourth valve, close the fifth valve, and select the length of the water pipeline according to the test requirements. Close or open the valves on other pipelines and check whether the valves are tightly closed.

[0040] S2. Check whether the water pump, flow regulating valve, and pneumatic valve are in normal condition; check whether the data acquisition system is working properly; check whether the water level in the main tank of the water hammer elimination box and the air pressure in the separate air tank have reached the set value;

[0041] S3. Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the first water tank level gauge, the second water tank level gauge, the main water pump speed sensor, and the main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0042] S4. Cut off the power to the main water pump and the pneumatic pump behind it. Record the main water pump speed, main line flow, main line pressure, the liquid level, pressure and temperature of the main tank of the water hammer elimination box, the pressure and temperature of the separate air tank, and the changes in gas flow.

[0043] S5. Repeat the test three times to ensure the accuracy and repeatability of the test data;

[0044] S6. Adjust the first bellows and the second bellows to the required height, and repeat steps S2 to S5;

[0045] S7. After the test is completed, the equipment involved in the test will be restored to its initial state.

[0046] A test method based on the test device, characterized in that:

[0047] S1. Open the fourth valve, close the fifth valve, and select the length of the water pipeline according to the test requirements. Close or open the valves on other pipelines and check whether the valves are tightly closed.

[0048] S2. Check whether the water pump, flow regulating valve, and pneumatic valve are in normal condition; check whether the data acquisition system is working properly; check whether the water level in the main tank of the water hammer elimination box and the air pressure in the separate air tank have reached the set value;

[0049] S3. Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the first water tank level gauge, the second water tank level gauge, the main water pump speed sensor, the main line electromagnetic flow meter, and the pressure sensor until the data changes are basically stable and record them;

[0050] S4. Adjust the opening of the flow regulating valve and observe the pressure change of the pressure sensor behind the main water pump until the data changes are basically stable at the value required for the test and record it;

[0051] S5. Cut off the power to the main water pump and the pneumatic pump behind it. Record the main water pump speed, main line flow, main line pressure, the liquid level, pressure and temperature of the main tank of the water hammer elimination box, the pressure and temperature of the separate air tank, and the changes in gas flow.

[0052] S6. Repeat the test three times to ensure the accuracy and repeatability of the test data;

[0053] S7. After the test is completed, the equipment involved in the test will be restored to its initial state.

[0054] A test method based on the test device, characterized in that:

[0055] S1. Open the fourth valve, close the fifth valve, and select the length of the water pipeline according to the test requirements. Close or open the valves on other pipelines and check whether the valves are tightly closed.

[0056] S2. Check whether the water pump, flow regulating valve, and pneumatic valve are in normal condition; check whether the data acquisition system is working properly; check whether the water level in the main tank of the water hammer elimination box and the air pressure in the separate air tank have reached the set value;

[0057] S3. Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the first water tank level gauge, the second water tank level gauge, the main water pump speed sensor, and the main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0058] S4. Cut off the power to the main water pump and the pneumatic pump behind it. Record the main water pump speed, main line flow, main line pressure, the liquid level, pressure and temperature of the main tank of the water hammer elimination box, the pressure and temperature of the separate air tank, and the changes in gas flow.

[0059] S5. Repeat the test three times to ensure the accuracy and repeatability of the test data;

[0060] S6. Open the fifth valve, close the fourth valve, and check whether the valves are tightly closed;

[0061] S7, repeat steps S2 to S5, and ensure that the operating state of the water delivery system after the pump is started and stabilized is basically consistent with the stable state achieved in step S3;

[0062] S8. After the test is completed, the equipment involved in the test will be restored to its initial state.

[0063] The beneficial effects of the present invention are as follows: the present invention changes the water flow route by switching the valve on the secondary pipeline, can switch between various water delivery pipeline lengths, and facilitates testing the hydraulic performance of the separate water hammer elimination box under different pipeline lengths.

[0064] This utility model incorporates a bellows in the connecting pipe between the main tank and the separate air tank of the water hammer eliminator, facilitating assembly and avoiding inappropriate connecting pipe lengths caused by uneven floor heights. Furthermore, by adjusting the bellows' height, the air valve elevation can be varied, enabling testing of the effect of the air valve elevation on the performance of the water hammer eliminator.

[0065] The utility model is equipped with a flow regulating valve on the downstream side of the first water tank. By adjusting the opening of the flow regulating valve, the impedance elements such as valves on the water delivery pipeline after the pump can be simulated to test the hydraulic performance of the water hammer elimination box under different pipeline impedances.

[0066] In the utility model, both the first water tank and the second water tank are provided with a water level regulating mechanism (water supply pump, overflow pipe). Through the cooperation of the water supply pump and the overflow pipe, the water level can be kept constant during the experiment, thereby avoiding the influence of the water level change in the water tank on the experiment and improving the test accuracy.

[0067] The utility model installs a four-way pipe on the main pipe, places two water hammer protection devices at the same position behind the main water pump, and can switch the two water hammer protection devices by switching the fourth and fifth valves, which facilitates hydraulic performance comparison and improves test efficiency.

[0068] This new air valve is assembled from an upper and lower valve body. The positioning block within the air valve can be easily replaced to adjust the initial height of the float, allowing for quick adjustment of the float stroke. For smaller water hammer eliminators that fill quickly, replacing the positioning block can shorten the float stroke, allowing the air valve to close quickly and prevent overflow.

[0069] The utility model sets the water level of the main tank of the water hammer elimination box and the air pressure in the separate air tank before the water pump loses power, which can ensure that water and gas are isolated from each other during steady-state operation, reduce gas dissolution, and avoid frequent air replenishment to the separate air tank. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a schematic diagram of this utility model patent;

[0071] Figure 2 It is a schematic diagram of a separate water hammer elimination box;

[0072] Figure 3 is a schematic diagram of an air valve;

[0073] Figure 4 This is the measured pressure data after the water pump is powered off;

[0074] Figure 5 This is the actual measured flow data of the air valve on the top of the main tank when the water pump is powered off.

[0075] Explanation of the accompanying reference numerals: 1 low-level water tank, 2 first water supply pump, 3 first overflow pipeline, 4 return water tank, 5 second water supply pump, 6 second overflow pipeline, 7 main pipeline, 8 main water pump, 9 pneumatic valve, 10 four-way pipe, 11 first valve, 12 water hammer elimination box main tank, 13 third connecting pipe, 14 separate air tank, 15 second valve, 16 traditional air tank or other water hammer protection equipment, 17 first valve, 18 first pipeline, 19 second valve, 20 second pipeline, 21 third valve, 22 third pipeline, 23 flow regulating valve, 24 high-level water tank, 131 first bellows, 132 air valve, 133 oblique support, 134 second bellows, 1321 upper valve body, 1322 limit sleeve, 1323 lower valve body, 1324 guide cylinder, 1325 float, 1326 positioning block. DETAILED DESCRIPTION

[0076] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0077] It should be clear that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0078] The terms used in the embodiments of the present application are for the purpose of describing specific embodiments only and are not intended to limit the present application. The singular forms "a", "an", "the" and "the" used in the embodiments of the present application and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0079] It should be noted that the directional words such as "upper", "lower", "left", and "right" described in the embodiments of the present application are described based on the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should be understood that when it is mentioned that an element is connected to another element "on" or "under", it can not only be directly connected to the other element "on" or "under", but also be indirectly connected to the other element "on" or "under" through an intermediate element.

[0080] like Figure 1 As shown, this embodiment is a separate water hammer elimination box performance test device, including: a first water tank (high-level water tank), a second water tank (low-level water tank), a water supply pipeline, a multi-function control valve, a flow regulating valve, a water hammer elimination box main tank, a separate air tank, an air valve, a pressure sensor, a temperature sensor, an electromagnetic flowmeter, a liquid level meter, a data acquisition system, etc.

[0081] In this example, the first water tank is equipped with a first water level regulating mechanism, which includes a return water tank, a first make-up water pump and a first overflow pipe. The return water tank and the first water tank are connected via a first water supply pipe and a first overflow pipe. The first make-up water pump is installed on the first water supply pipe. The first make-up water pump pumps the water in the return water tank into the first water tank. When the water in the first water tank exceeds the preset first water level, the water flows into the return water tank through the first overflow pipe.

[0082] In this embodiment, the second water tank is equipped with a second water level regulating mechanism, which includes a return water tank, a second water supply pump and a second overflow pipe. The return water tank and the second water tank are connected via a second water supply pipe and a second overflow pipe. The second water supply pipe is equipped with a second water supply pump, which pumps water in the return water tank into the second water tank. When the water in the second water tank exceeds the preset second water level, the water flows into the return water tank through the second overflow pipe.

[0083] In this example, the water supply pipeline has a main pipeline and three secondary pipelines of different lengths. The first end of the main pipeline is connected to the second water tank, the second end of the main pipeline is connected to the first end of each secondary pipeline, and the second end of each secondary pipeline is connected to the first water tank through a flow regulating valve.

[0084] In this embodiment, the three secondary pipelines of different lengths include a first pipeline, a second pipeline and a third pipeline, wherein the first end of the first pipeline is connected to the second end of the main pipeline, and its second end is connected to the flow regulating valve, and the first valve is installed on the first pipeline; the first end of the second pipeline is connected to the first pipeline, and its second end is connected to the flow regulating valve, and the second pipeline is installed on the second valve; the first end of the third pipeline is connected to the second pipeline, and its third end is connected to the flow regulating valve, and the third pipeline is installed on the third valve.

[0085] In this example, the first valve is opened, the second and third valves are closed, and the first pipeline is connected; the second valve is opened, the first and third valves are closed, and the second pipeline (consisting of the second pipeline and part of the first pipeline) is connected; the third valve is opened, the first and second valves are closed, and the third pipeline (consisting of the third pipeline and part of the first and second pipelines) is connected.

[0086] In this embodiment, a main water pump, a pneumatic valve, and a four-way pipe are installed on the main pipeline. The third end of the four-way pipe is connected to the separate water hammer elimination mechanism through the fourth valve, and the fourth end of the four-way pipe is connected to the water hammer protection device (a traditional air tank or other existing water hammer protection device for comparison) through the fifth valve. Valves are also installed on each secondary pipeline.

[0087] like Figure 2 As shown, in this example, the separate water hammer elimination mechanism includes a water hammer elimination box main tank, an inverted U-shaped connecting pipe and a separate air tank, wherein the first end of the inverted U-shaped connecting pipe is connected to the water hammer elimination box main tank via an air valve and a first bellows, and the second end of the inverted U-shaped connecting pipe is connected to the separate air tank via a second bellows.

[0088] like Figure 3 As shown, the air valve in this embodiment includes: a lower valve body, a guide cylinder, a float, a positioning block, an upper valve body, a limit sleeve, etc., wherein the lower valve body has a valve body chamber, and the lower end of the valve body chamber is provided with an air and water inlet; the guide cylinder is arranged in the valve body chamber, the lower end of the guide cylinder has at least one through hole, and the upper end of the guide cylinder is open and exposed on the upper end surface of the lower valve body; the float is placed in the guide cylinder, and the diameter is smaller than the inner diameter of the guide cylinder; the positioning block is arranged at the bottom of the guide cylinder to support the float; the upper valve body can be assembled with the lower valve body, and the upper end of the guide cylinder is provided with an air inlet and exhaust port; the limit sleeve is arranged in the upper valve body, the lower end of which can be connected with the guide cylinder when the upper and lower valve bodies are assembled, and the upper end is connected to the air inlet and exhaust port, the inner diameter of the lower end of the limit sleeve is adapted to the inner diameter of the guide cylinder, and the inner diameter of the limit sleeve gradually decreases from the lower end to the upper end, and is adapted to the shape of the float.

[0089] In this embodiment, the positioning block can be replaced by opening the upper valve body and taking out the float. By replacing the positioning block, the height of the positioning block is changed, thereby quickly adjusting the float stroke.

[0090] In this example, the gas enters the valve body chamber through the lower gas-water inlet, then enters the guide cylinder through the through hole, and is discharged from the gap between the float and the guide cylinder to the upper air inlet and outlet.

[0091] In this embodiment, water enters the valve body chamber through the lower air-water inlet and then enters the guide cylinder through the through hole. The water level in the guide cylinder rises, and the float moves up with the rising water level until the float enters the limit sleeve and cooperates with the limit sleeve to achieve blocking, thereby preventing gas from being discharged from the air inlet and outlet.

[0092] In this example, both the high-level and low-level water tanks are equipped with liquid level gauges. A pressure sensor is located downstream of the pneumatic valve on the main line. A speed sensor is installed on the main water pump shaft to measure the pump speed. An electromagnetic flowmeter and pressure sensor are located upstream and downstream of the water hammer eliminator. The main tank of the water hammer eliminator is equipped with a liquid level gauge, pressure sensor, and temperature sensor, while the separate air tank is equipped with a temperature sensor and pressure sensor. A gas flowmeter is located on the third connecting pipe. Data collected by these sensors is collected using a data acquisition system.

[0093] In this embodiment, the high-level water tank is set at 6m, and the low-level water tank at 1m. When the water level in the tank exceeds the limit, the water overflows into the return tank. The main pipeline is DN150 and 15m long. It houses the main water pump, a pneumatic valve, and a cross-section pipe. The main water pump is a variable-frequency pump with a rated head of 50m, a rated flow rate of 30L / s, and a rated speed of 2950rpm. The first pipeline is approximately 15m long, while the second and third pipelines are each approximately 200m long.

[0094] The main water hammer eliminator tank is 1 meter tall and 1.1 meter in diameter. An air valve is installed on top of the main tank. The separate air tank is 0.5 meter tall and 1.0 meter in diameter. The main tank and separate air tank are connected by a third connecting pipe. This inverted U-shaped connecting pipe is equipped with diagonal supports to enhance the structural stability of the third connecting pipe.

[0095] The test device of this embodiment can be used to perform performance tests on the separate water hammer suppression box under different water pipeline lengths, different water pipeline impedances, and different air valve elevations, and can also be used for comparative tests with traditional water hammer protection equipment.

[0096] Test 1: The water hammer protection performance of the separate water hammer eliminator under the water pipeline with lengths of 30m, 200m and 400m was tested in sequence. The specific implementation method is as follows:

[0097] S1 opens the fourth valve, closes the fifth valve, opens the first valve, closes the second valve, and checks whether the second valve is tightly closed;

[0098] S2 Check whether the test equipment such as the water pump, flow regulating valve, pneumatic valve, etc. are in normal condition; check whether the data acquisition system is working properly, check whether the main tank of the water hammer elimination box is full of water, and whether the air pressure in the separate air tank reaches 90% of the pressure at the top of the main tank;

[0099] S3 Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the high-level water tank level gauge, low-level water tank level gauge, main water pump speed sensor, and main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0100] S4 cuts off the power supply to the main water pump and the pneumatic pump behind it, and records the main water pump speed, main line flow, main line pressure, main tank liquid level, pressure and temperature of the water hammer elimination box, pressure and temperature of the separated air tank, and gas flow changes;

[0101] S5 repeats the test three times to ensure the accuracy and repeatability of the test data;

[0102] S6 switches the length of the water supply pipeline: close the first and third valves, open the second valve, and check whether the first and third valves are tightly closed;

[0103] S7 repeats steps S2 to S5;

[0104] S8 switches the length of the water supply pipeline: close the first and second valves, open the third valve, and check whether the first and second valves are tightly closed;

[0105] S9 repeats steps S2 to S5;

[0106] After the S10 test is completed, the equipment involved in the test will be restored to its initial state.

[0107] Test 2: Test the effect of air valve elevation on water hammer suppression box performance. The specific implementation method is as follows:

[0108] S1 opens the fourth valve, closes the fifth valve, and selects the length of the water pipeline according to the test requirements, closes or opens the valves on other pipelines, and checks whether the valves are tightly closed;

[0109] S2 Check whether the test equipment such as the water pump, flow regulating valve, pneumatic valve, etc. are in normal condition; check whether the data acquisition system is working properly; check whether the main tank of the water hammer elimination box is full of water and whether the air pressure in the separate air tank reaches 90% of the pressure at the top of the main tank;

[0110] S3 Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the high-level water tank level gauge, low-level water tank level gauge, main water pump speed sensor, and main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0111] S4 cuts off the power supply to the main water pump and the pneumatic pump behind it, and records the main water pump speed, main line flow, main line pressure, main tank liquid level, pressure and temperature of the water hammer elimination box, pressure and temperature of the separated air tank, and gas flow changes;

[0112] S5 repeats the test three times to ensure the accuracy and repeatability of the test data;

[0113] S6: Adjust the first bellows and the second bellows to the required height, and repeat steps S2 to S5;

[0114] After the S7 test is completed, the equipment involved in the test will be restored to its initial state.

[0115] Test 3: Test the water hammer protection performance of the water hammer eliminator under different pipeline impedances. The specific implementation method is as follows:

[0116] S1 opens the fourth valve, closes the fifth valve, and selects the length of the water pipeline according to the test requirements, closes or opens the valves on other pipelines, and checks whether the valves are tightly closed;

[0117] S2 Check whether the test equipment such as the water pump, flow regulating valve, pneumatic valve, etc. are in normal condition; check whether the data acquisition system is working properly; check whether the main tank of the water hammer elimination box is full of water and whether the air pressure in the separate air tank reaches 90% of the pressure at the top of the main tank;

[0118] S3 opens the pneumatic valve, starts the water supply pump and the main water pump, and observes the data collected by the high-level water tank level gauge, low-level water tank level gauge, main water pump speed sensor, main line electromagnetic flow meter, and pressure sensor until the data changes are basically stable and record them;

[0119] S4 adjusts the opening of the flow regulating valve and observes the pressure change of the pressure sensor after the main water pump until the data changes are basically stable at the value required for the test and records it;

[0120] S5 cuts off the power supply to the main water pump and the pneumatic pump behind it, and records the main water pump speed, main line flow, main line pressure, main tank level, pressure and temperature of the water hammer elimination box, pressure and temperature of the separated air tank, and changes in gas flow;

[0121] S6 repeated the test three times to ensure the accuracy and repeatability of the test data;

[0122] After the S7 test is completed, the equipment involved in the test will be restored to its initial state.

[0123] Test 4: Performance comparison of the split water hammer suppression box and traditional water hammer protection equipment. The specific implementation method is as follows:

[0124] S1 opens the fourth valve, closes the fifth valve, and selects the length of the water pipeline according to the test requirements, closes or opens the valves on other pipelines, and checks whether the valves are tightly closed;

[0125] S2 Check whether the test equipment such as the water pump, flow regulating valve, pneumatic valve, etc. are in normal condition; check whether the data acquisition system is working properly; check whether the main tank of the water hammer elimination box is full of water and whether the air pressure in the separate air tank reaches 90% of the pressure at the top of the main tank;

[0126] S3 Open the pneumatic valve, start the water supply pump and the main water pump, and observe the data collected by the high-level water tank level gauge, low-level water tank level gauge, main water pump speed sensor, and main line electromagnetic flowmeter until the data changes are basically stable at the value required for the test and record them;

[0127] S4 cuts off the power supply to the main water pump and the pneumatic pump behind it, and records the main water pump speed, main line flow, main line pressure, main tank liquid level, pressure and temperature of the water hammer elimination box, pressure and temperature of the separated air tank, and gas flow changes;

[0128] S5 repeats the test three times to ensure the accuracy and repeatability of the test data;

[0129] S6 opens the fifth valve, closes the fourth valve, and checks whether the valves are tightly closed;

[0130] S7 repeats steps S2 to S5, and ensures that the operating state of the water delivery system after the pump is started and stabilized is basically consistent with the stable state achieved in step S3;

[0131] After the S8 test is completed, the equipment involved in the test will be restored to its initial state.

Claims

1. A separate water hammer elimination box performance test device, characterized in that: include: The first water tank is equipped with a first water level regulating mechanism capable of maintaining the water level in the first water tank at a preset first water level; The second water tank is equipped with a second water level regulating mechanism capable of maintaining the water level in the second water tank at a preset second water level; a water delivery pipeline having a main pipeline and at least two secondary pipelines of different lengths, wherein a first end of the main pipeline is connected to the second water tank, a second end of the main pipeline is connected to the first end of each secondary pipeline, and the second end of each secondary pipeline is connected to the first water tank via a flow regulating valve; The main pipe is equipped with a main water pump, a pneumatic valve and a four-way pipe. The third end of the four-way pipe is connected to the separate water hammer elimination mechanism through the fourth valve, and the fourth end of the four-way pipe is connected to the water hammer protection device through the fifth valve. Valves are installed on each secondary pipe. The separate water hammer elimination mechanism includes a water hammer elimination box main tank, an inverted U-shaped connecting pipe and a separate air tank, wherein the first end of the inverted U-shaped connecting pipe is connected to the water hammer elimination box main tank via an air valve and a first bellows, and the second end of the inverted U-shaped connecting pipe is connected to the separate air tank via a second bellows.

2. The performance test device for the separate water hammer elimination box according to claim 1 is characterized in that: The first water level regulating mechanism comprises: Return water tank; a first water supply pump, disposed between the return water tank and the first water tank, for pumping water in the return water tank into the first water tank; The first overflow pipe is connected to the return water tank and the first water tank. When the water in the first water tank exceeds a preset first water level, the water flows into the return water tank through the first overflow pipe.

3. The performance test device for the separate water hammer elimination box according to claim 1 is characterized in that: The second water level regulating mechanism comprises: Return water tank; a second water supply pump, disposed between the return water tank and the second water tank, for pumping water in the return water tank into the second water tank; The second overflow pipe is connected to the return water tank and the second water tank. When the water in the second water tank exceeds a preset second water level, the water flows into the return water tank through the second overflow pipe.

4. The performance test device for the separate water hammer elimination box according to claim 1 is characterized in that: The at least two secondary pipelines of different lengths include: a first pipeline, a first end of which is connected to the second end of the main pipeline, and a second end of which is connected to the flow regulating valve, and a first valve is installed on the first pipeline; a second pipeline, a first end of which is connected to the first pipeline, a second end of which is connected to the flow regulating valve, and a second valve is installed on the second pipeline; The third pipeline has a first end connected to the second pipeline and a third end connected to the flow regulating valve. A third valve is installed on the third pipeline.

5. The performance test device for the separate water hammer elimination box according to claim 1 is characterized in that: The air valve comprises: The lower valve body has a valve body chamber therein, and the lower end of the valve body chamber is provided with an air and water inlet; A guide cylinder is disposed in the valve body cavity, wherein the lower end of the guide cylinder has at least one through hole, and the upper end of the guide cylinder is open and exposed on the upper end surface of the lower valve body; A float ball is placed in the guide cylinder and has a diameter smaller than the inner diameter of the guide cylinder; A positioning block is provided at the bottom of the guide cylinder and is used to support the float; The upper valve body can be assembled with the lower valve body, and the upper end of the upper valve body is provided with an air inlet and an air outlet; The limit sleeve is arranged in the upper valve body, and its lower end can be connected with the guide cylinder when the upper and lower valve bodies are assembled, and its upper end is connected to the air inlet and exhaust ports. The inner diameter of the lower end of the limit sleeve is adapted to the inner diameter of the guide cylinder. The inner diameter of the limit sleeve gradually decreases from the lower end to the upper end and is adapted to the shape of the float.

Images