Water flow standard device

Abstract

The embodiment of the utility model provides a water flow standard device, which relates to the technical field of metering calibrators, and can realize the measurement of a water flow meter under multiple working conditions. Comprising a commutator; the at least two water tanks are arranged on an output end pipeline of the reverser and comprise a first water tank and a second water tank; wherein the output end of the first water tank and the output end of the second water tank are respectively connected to a tested workbench through a pipeline control component, and return to the input end of the commutator through the tested workbench in a loopback manner; wherein the detected workbench is configured to be provided with a detected flow meter, the first water tank is configured to be a normal-temperature water tank, the second water tank is configured to be a high-temperature or low-temperature water tank, and the device can be used for parameter calibration, detection and prototype experiment of various liquid flow meters such as an electromagnetic flow meter, an ultrasonic flow meter and a mass flow meter.

Description

Technical Field

[0001] The utility model relates to the technical field of metrological calibration instruments, and particularly to a multi-condition water flow standard device. Background Art

[0002] A water flow standard device is a measuring device used to calibrate and detect various water flow measuring instruments. It plays an indispensable role in many fields such as industrial production, scientific research, and metrological detection. Its measurement accuracy and reliability are directly related to the production quality and data accuracy of related industries. It provides accurate standard values for flow measuring instruments by precisely controlling and measuring various parameters of water flow, ensuring the reliability of the measurement results of these instruments in actual use.

[0003] However, the test conditions of the current water flow standard devices on the market are relatively single, and most of them can only measure water flow under conventional conditions of normal temperature and pressure, unable to meet the diverse actual working conditions requirements, such as high and low temperature working conditions, etc. Summary of the Utility Model

[0004] In view of this, an embodiment of the utility model provides a water flow standard device, which can realize the measurement of water flow meters under multiple working conditions.

[0005] To achieve the above object, the present application adopts the following technical solutions:

[0006] A water flow standard device includes: a commutator;

[0007] At least two water tanks arranged on the output pipeline of the commutator, and the at least two water tanks include a first water tank and a second water tank; wherein,

[0008] The output ends of the first water tank and the second water tank are respectively connected to the workbench under test via pipeline control components, and loop back to the input end of the commutator via the workbench under test; wherein, the workbench under test is configured to install the flow meter under test, the first water tank is configured as a normal temperature water tank, and the second water tank is configured as a high temperature water tank or a low temperature water tank.

[0009] Optionally, the at least two water tanks further include: a third water tank, the third water tank is configured as a low temperature or high temperature water tank, the third water tank and the second water tank are arranged in parallel, and the output end is connected to the workbench under test via the pipeline control component, and loop back to the input end of the commutator via the workbench under test; wherein, when the third water tank is configured as a low temperature water tank, the second water tank is configured as a high temperature water tank; when the third water tank is configured as a high temperature water tank, the second water tank is configured as a low temperature water tank.

[0010] Optionally, a weighing device is provided between the output end of the commutator and each water tank. The pipeline control component includes: a water pump, a pressure stabilizing tank, a flow regulating valve, a standard measuring meter, and a stop valve. Among them, the output ends of the first water tank and the second water tank are respectively connected to the workbench to be measured via the water pump, the pressure stabilizing tank, and the flow regulating valve, and loop back to the input end of the commutator via the standard measuring meter and the stop valve.

[0011] Optionally, one set of the pipeline control component is provided corresponding to each of the first water tank and the second water tank, or one set of the pipeline control component is provided jointly corresponding to the first water tank and the second water tank.

[0012] Optionally, the device further includes: a high and low temperature test bench, which includes: a high and low temperature chamber. A workbench to be measured is provided inside the high and low temperature chamber. The input end of the high and low temperature chamber is connected to a pipeline node after the flow regulating valve of the first water tank, and the output end of the high and low temperature chamber is connected to a pipeline node in front of the standard measuring meter.

[0013] Optionally, the device further includes: a high-level water tank, and the output end of the high-level water tank is connected to a pipeline node before the pressure stabilizing tank provided at the output end of the second water tank.

[0014] Optionally, the device further includes: an air compressor, an air storage tank, a flow regulating valve, and a gas flow meter. The output end of the air compressor is connected to the air inlet of the air storage tank. The air outlet of the air storage tank is connected to one end of the gas flow meter via the flow regulating valve, and the other end of the gas flow meter is connected to a pipeline node before the standard measuring meter at the output end of the first water tank.

[0015] Optionally, an elbow section is provided at a pipeline node before and / or after the workbench to be measured at the output end of the first water tank.

[0016] Optionally, the device further includes: a pressure resistance test bench, which includes: a left pipe section and a right pipe section provided on the workbench. A position for installing a measured gauge is provided between the left pipe section and the right pipe section. A pressurizing device is connected to the right pipe section, and a pressure resistance gauge is provided on the right pipe section;

[0017] The left pipe section is connected to a pipeline node before the standard measuring meter at the output end of the first water tank, and the right pipe section is connected to a pipeline node after the standard measuring meter at the output end of the first water tank.

[0018] Optionally, the device further includes: a pipe section connection conversion device connected to the workbench to be measured, configured to connect multiple pipe sections with different wall thicknesses and materials.

[0019] The water flow rate standard device provided by the embodiments of the present application is provided with at least two water tanks on the output pipeline of the commutator, wherein one is configured as a normal temperature water tank, and the other is configured as a high temperature or low temperature water tank. The output ends of the first water tank and the second water tank are respectively connected to the workbench to be measured through pipeline control components, and loop back to the input end of the commutator through the workbench to be measured. In this way, at least test loops under normal temperature and high temperature or low temperature conditions can be formed, so that the measurement of the water flowmeter can be realized under multiple working conditions. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0021] Figure 1 Structural schematic diagram of an embodiment of the water flow rate standard device of the present application;

[0022] Figure 2 Structural schematic diagram of another embodiment of the water flow rate standard device of the present application;

[0023] Figure 3 For Figure 1 Structural schematic diagram of an embodiment of the high and low temperature environmental temperature test bench;

[0024] Figure 4 For Figure 1 Structural schematic diagram of an embodiment of the pressure resistance test device. Detailed Description of the Embodiments

[0025] The following will describe the embodiments of the present application in detail with reference to the drawings.

[0026] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope of protection of the present application.

[0027] The water flow standard device is a measuring device that uses liquid as the experimental medium to provide a flow value with a determined accuracy. It mainly consists of a water source system, a pipeline system, an electric flow regulating valve, a pneumatic on-off valve, an electronic scale, an electromagnetic flowmeter, a commutator, a timer, a data acquisition and control system, and an electrical system. It can be used for parameter calibration, detection, and prototype experiments of various liquid flowmeters such as electromagnetic flowmeters, ultrasonic flowmeters, and mass flowmeters. However, the existing water flow standard devices generally only have a normal temperature water tank and can only be applied to tests under a single working condition, and are not suitable for scenarios where multiple working conditions need to be tested or calibrated.

[0028] To meet the need for multi-condition testing, refer to Figure 1 , an embodiment of the present utility model provides a multi-condition water flow standard device, including: a commutator 20; multiple commutators can be provided, and the structure and working principle of the commutator are known and mature technologies, so they will not be elaborated here.

[0029] At least two water tanks, including a first water tank 211 and a second water tank 212. The first water tank 211 is configured as a normal temperature water tank and serves as the main water tank, generally made of stainless steel. The first water tank 211 is mainly used for normal temperature working condition testing. During testing, the water flows out of the first water tank 211 by relying on the gravity or the pressure generated by the water pump, providing a stable normal temperature water flow medium for the flowmeter testing.

[0030] The second water tank 212 is configured as a high-temperature or low-temperature water tank and can be equipped with heating and refrigeration components. For example, when configured as a high-temperature water tank, a resistance wire heater is provided inside it. When heating, the heater works, and the resistance heating wire of the heater generates heat through current to heat the water in the tank, and the maximum water temperature can reach 60°C. When configured as a low-temperature water tank, it can be connected to an industrial chiller and heat exchange is carried out through a refrigeration coil to take away heat, and the minimum water temperature can be as low as 5°C. Specifically, the high temperature and low temperature described in this embodiment are two relative concepts. High temperature is generally from the normal temperature to 60°C, and low temperature is generally from 5°C to the normal temperature, where the normal temperature is the ambient temperature of the device at that time. The second water tank 212 is applicable to test working conditions with a flow rate below 40 m³ / h to be used for performance testing of the flowmeter in high and low temperature environments within this flow rate range.

[0031] The output ends of the first water tank 211 and the second water tank 212 are respectively connected to the workbench under test 50 via pipeline control components, and the water flows back to the input end of the commutator 20 after passing through the workbench under test 50, forming a closed water flow circulation test loop. Among them, the connecting pipelines between the components generally use high-strength, temperature-resistant and pressure-resistant pipes, such as seamless steel pipes or engineering plastic pipes, to ensure stable water flow transmission under different working conditions. The workbench under test 50 is configured to install the flowmeter under test. During the test, the water flows evenly and stably through the flowmeter under test to ensure measurement accuracy.

[0032] In this embodiment, by configuring at least two water tanks, one configured as a normal-temperature water tank and one configured as a high-temperature or low-temperature water tank, the output ends of the first water tank and the second water tank are respectively connected to the workbench under test via pipeline control components and loop back to the input end of the commutator via the workbench under test. In this way, at least a test loop under normal temperature and high-temperature or low-temperature conditions can be formed, so that the measurement of the water flowmeter can be realized under multiple working conditions.

[0033] In some embodiments, a weighing device 40 is provided between the output end of the commutator 20 and each water tank. The weighing device 40 can specifically be an electronic scale (for the convenience of narration hereinafter, the electronic scale 40 is also used to replace the weighing device 40 for description). The commutator switches different water flow channels and flows into the water tank via the weighing device 40, or directly flows into the water tank via the return pipe.

[0034] In some embodiments, the at least two water tanks further include a third water tank 213, and the third water tank is configured as a low-temperature or high-temperature water tank.

[0035] The third water tank 213 is arranged in parallel with the second water tank 212, and the output end is connected to the workbench under test 50 via the pipeline control component and loops back to the input end of the commutator 20 via the workbench under test 50; wherein, when the third water tank 213 is configured as a low-temperature water tank, the second water tank 212 is configured as a high-temperature water tank, as Figure 1 shown; of course, when the third water tank is configured as a high-temperature water tank, the second water tank is configured as a low-temperature water tank. In this application, by arranging the second water tank and the third water tank in parallel and making one of the second water tank and the third water tank low-temperature and the other configured as high-temperature, in this way, when comprehensively testing the temperature performance of a flow meter, the second water tank 212 can be used to provide high-temperature water for testing first. After recording the data, switch to the third water tank 213 to provide low-temperature water for continuous testing. By comparing the test data at different temperatures, the performance of the water flowmeter can be comprehensively evaluated.

[0036] In some test examples, when the third water tank 213 participates in the test, its test process, the range of the tested flowmeter caliber, the test flow range, the medium temperature range, and the types of flowmeters that can be detected are the same as those when the second water tank 212 is in the test working condition. Similarly, set the target temperature before the test, select the corresponding water tank through the system software, and use the water pump to pump water for testing.

[0037] In some embodiments, the pipeline control components include a water pump 41, a pressure stabilizing tank 42, a flow regulating valve 43, a standard measuring meter 44, and a stop valve 45; wherein, the output ends of the first water tank 211 and the second water tank 212 are respectively connected to the workbench under test 50 via the water pump 41, the pressure stabilizing tank 42, and the flow regulating valve 43, and loop back to the input end of the commutator via the standard measuring meter 44 and the stop valve 45.

[0038] The flow regulating valve 43 can be an electric regulating valve or a pneumatic regulating valve. The electric regulating valve drives the valve core through a motor to change the valve opening degree to achieve precise control of the flow rate; the pneumatic regulating valve uses compressed air to drive the valve core to act. These two types of flow regulating valves are mature technologies in this field and will not be elaborated specifically. Among them, the opening degree of the flow regulating valve 43 can be adjusted according to the control system instruction to precisely control the size of the water flow rate and meet the diverse requirements of different test conditions for the flow rate. When performing a micro-flow test, the flow regulating valve 43 can be finely adjusted to stably control the flow rate at a lower value to achieve the test of the small-flow condition.

[0039] The standard measuring meter 44 can correspond to an electromagnetic flowmeter, a turbine flowmeter, etc. according to the type of the measured measuring meter. The standard measuring meter 44 has a high-precision flow measurement ability, and its measurement result is used as a benchmark for evaluating the accuracy of the measured flowmeter. During the test process, the measurement data of the measured flowmeter is compared with the data of the standard measuring meter 44 to judge the performance quality of the measured flowmeter. The stop valve 45 generally uses a gate valve or a ball valve to cut off the water flow when it is necessary to stop the water flow circulation or perform equipment maintenance, ensuring the safety of the equipment and the smooth progress of the maintenance calibration work.

[0040] See Figure 1 As shown, taking the high-temperature test process as an example: Before the test, set the target temperature of the second water tank 212 (as the hot water tank) through the control system, and start the electric heater to heat the water. After reaching the target temperature, select the second water tank 212 using the system software. The water pump is started to pump out the water in the hot water tank, and the water flow passes through the water pump 41, the pressure stabilizing tank 42, the flow regulating valve 43, the measured workbench 50, the standard meter 44 in sequence, and finally reaches the electronic scale 40 via the commutator 20 to complete a test process. During the test process, the water flow rate can be adjusted by adjusting the frequency of the water pump 41 and the opening degree of the flow regulating valve 43. Specifically, multiple flow regulating valves 43 can be set according to needs.

[0041] Within a user-defined test time period, such as 60 s, compare the cumulative volume flow recorded by the electronic scale and the cumulative flow of the measured meter. If the error between the two is within the specified allowable range, it indicates that the measured flowmeter is qualified in this condition.

[0042] In this test example, the test flowmeter caliber range is DN10~DN50, the test flow range is 0.01~40 m³ / h, the medium temperature range is (5~60)°C, and the detectable flowmeter types include mass flowmeters, electromagnetic flowmeters, and vortex street flowmeters.

[0043] Continue to see Figure 1As shown, in some embodiments, a set of pipeline control components is provided corresponding to the first water tank 211 and the second water tank 212 together. In this case, the switching and adjustment of the water flow in the two water tanks can be achieved by setting valves at appropriate positions. For example, stop valves are respectively arranged on the output pipelines of the first water tank 211 and the second water tank 212. When the first water tank 211 needs to supply water, the pipeline connected to the first water tank 211 is controlled by the stop valve, and the pipeline of the second water tank 212 is closed; and vice versa. In this embodiment, by sharing a set of pipeline control components for the first water tank 211 and the second water tank 212, the overall structure of the device can be simplified.

[0044] In other embodiments, a set of pipeline control components is provided corresponding to the first water tank 211 and the second water tank 212 respectively; in this way, the water flow control of each water tank can be completely independent, and the normal temperature and high temperature or low temperature working condition tests can be carried out simultaneously without interference with each other, so as to more accurately simulate the water flow conditions under different working conditions and improve the test efficiency.

[0045] See Figure 1 and Figure 3 , in some embodiments, the water flow standard device further includes: a high and low temperature test bench 60, the high and low temperature test bench 60 includes: a high and low temperature chamber 61, a tested workbench 50 is arranged in the high and low temperature chamber 61, an input end 611 of the high and low temperature chamber 61 is configured to be connected to a water inlet pipeline, which is connected to a pipeline node after a flow regulating valve of the first water tank, and an output end 612 of the high and low temperature chamber 61 is configured to be connected to a water return pipeline, which is connected to a pipeline node in front of the standard measuring meter.

[0046] A tested workbench 50 is arranged inside the high and low temperature chamber 61. Among them, the tested workbench 50 is configured to install a tested measuring meter, and the outer layer is a heat preservation layer, which is made of heat insulating material to reduce heat dissipation or external heat transfer. The high and low temperature chamber 61 can be equipped with an independent temperature control system, including a temperature sensor, a heating element and a refrigerating element. The temperature sensor monitors the temperature inside the chamber in real time. When heating is required, the heating element works; when cooling is required, the refrigerating element starts, so as to achieve precise control of the temperature inside the chamber and simulate the ambient temperature where the tested measuring meter is located.

[0047] In this embodiment, during the test, first install the flowmeter under test on the workbench 50 under test in the high and low temperature chamber 61, and then set the target temperature of the high and low temperature chamber 61 according to the test requirements, such as 80 °C (simulating high temperature working conditions) or 20 °C (simulating low temperature working conditions). After the high and low temperature chamber 61 reaches the target temperature and stabilizes for a period of time, such as 1.5 h, turn on the pipeline control component corresponding to the first water tank 211 to make the water flow through the workbench 50 under test in the high and low temperature chamber 61. That is, the liquid flow direction is the first water tank 211 -> water pump 41 -> pressure stabilizing tank 42 -> test bench position 50 in the high and low temperature chamber 61 -> flow regulating valve 43 -> standard meter 44 -> commutator 20 -> electronic scale 40, completing the entire one-time test process. At this time, the water flow in the high and low temperature chamber 61 is affected by the set ambient temperature, simulating the high and low temperature actual flow environment in the actual working conditions. By adjusting the frequency of the pump 41 and the opening of the flow regulating valve 43, the water flow rate is controlled at the preset test value. Then, observe the flow rate data of the standard measuring meter 44 and the flowmeter under test, and compare the measurement results of the two to judge whether the metering performance of the flowmeter under test is accurate and reliable under the high and low temperature actual flow environment. For example, when testing a flowmeter used in an industrial high temperature environment, use the high and low temperature test bench 60 to simulate the high temperature actual flow environment and conduct strict tests on its performance to ensure the accuracy of the flowmeter in actual applications.

[0048] Among them, for different types of meters under test, the product dimensions are different. For example, for electromagnetic flowmeters, the flange spacing ≤ 200 mm, for mass flowmeters, the flange spacing ≤ 600 mm, the height ≤ 500 mm, the width ≤ 200 mm, and the diameter of the flowmeter under test is DN10 - DN50.

[0049] See Figure 1 Or Figure 2 As shown, in some embodiments, the device further includes: a low-conductivity medium water tank 214 connected to the second water tank or the third water tank to be applicable to simulating low-conductivity test working conditions.

[0050] Before conducting the low-conductivity working condition test, it is necessary to set the temperatures of the high-temperature water tank (acted by the second water tank 212) and the low-temperature water tank (acted by the third water tank 213). Use the industrial electric heater in the high-temperature water tank for heating and the industrial water chiller in the low-temperature water tank for refrigeration to make the two water tanks reach the preset target temperatures respectively, so as to provide low-conductivity water flow with specific temperatures for subsequent tests.

[0051] After the high-temperature water tank and the low-temperature water tank reach the target temperature, the water in the low-conductivity medium water tank 214 enters the high-temperature water tank and the low-temperature water tank, and the water tank selected as the hot water source is chosen through the system software. The water pump 41 is started, and the water pump 41 pumps out the water in the hot water tank. The water flows through the pressure stabilizing tank 42, the flow regulating valve 43, the workbench to be measured 50, the standard measuring meter 44, and the commutator in sequence and then reaches the electronic scale 40. During this process, the water flow stabilizes the pressure through the pressure stabilizing tank 42 to ensure the accuracy of flow measurement. The frequencies of the flow regulating valve 43 and the water pump 41 can be adjusted according to the test requirements to control the flow rate of the water flow, so that it reaches the preset test flow rate value and meets the test flow range requirement of (0.01 – 40) m³ / h.

[0052] During a user-defined test time, the cumulative volume flow recorded by the electronic scale 40 is compared with the cumulative flow of the flowmeter to be measured. If the error between the two is within the specified allowable error, it is determined that the flowmeter to be measured is qualified under this low-conductivity condition.

[0053] In this embodiment, the volume of the low-conductivity water tank is 2 m³, which is used to store and provide test water with a conductivity range of 0.1 μs / cm - 10 ms / cm. During the test, it is necessary to ensure that the conductivity in the water tank is always within the specified range, and it can be adjusted by adding specific electrolytes or deionized water, etc.

[0054] See Figure 1 or Figure 2 As shown, in some embodiments, the device further includes: a high-level water tank 70, which is used to achieve micro-flow testing and is used to compare the influence of flow stability on the performance of the test flowmeter. The output end of the high-level water tank 70 is connected to the pipeline node before the pressure stabilizing tank arranged at the output end of the second water tank 212. The height of the high-level water tank 70 is much higher than the highest point of the water outlets of the first water tank 211 to the third water tank 213; the output end of the high-level water tank 70 is connected to the pipeline node before the pressure stabilizing tank 42 arranged at the output end of the second water tank. The bottom of the high-level water tank 70 has a water inlet and a water outlet, and an overflow pipeline 71 is arranged along the upper edge of the water tank. The function of the overflow pipeline 71 is to ensure the constant liquid level in the water tank, and thus maintain the stability of the water supply pressure. When the water level in the water tank reaches the height of the overflow pipe, the excess water is discharged through the overflow pipeline to ensure that the water level in the water tank always remains at the set height and the water supply pressure is stable.

[0055] When conducting micro-flow tests, the water tank is set to the high-level water tank 70 mode, and the high-level water tank can be 100L. Water flows out from the high-level water tank 70, and the overall flow direction is that the water pump pumps water into the high-level water tank 70 -> pressure stabilizing tank 42 -> test bench position 40 -> flow regulating valve (which can be set either before or after the test bench position) -> standard meter 44 -> commutator 20 -> electronic scale 40, completing an entire test process. During the test, the target flow rate can be adjusted by adjusting the frequency of the pump and the valve opening of the flow regulating valve.

[0056] In this embodiment, the caliber range of the test flowmeter is DN10 - DN50. When connecting flowmeters with different calibers, it may be necessary to use appropriate pipe fittings for connection to ensure the smooth flow of water and the accuracy of the test.

[0057] See Figure 1 , in some embodiments, the device further includes: air compressor 81, air storage tank (not shown in the figure), flow regulating valve 83, and gas flowmeter 84. The output end of the air compressor 81 is connected to the air inlet of the air storage tank, the air outlet of the air storage tank is connected to one end of the gas flowmeter 84 via the flow regulating valve 83, and the other end of the gas flowmeter 84 is connected to the pipeline node before the standard meter 44 at the output end of the first water tank 211.

[0058] Before the test, first adjust the liquid flow rate in the pipeline to the target flow rate and make it stable. Then open the valve of the gas pipeline and start the air compressor 81. The air compressor 81 compresses the air and stores it in the air storage tank. By adjusting the flow regulating valve 83 at the air outlet of the air storage tank, the gas flow rate can be controlled. After passing through the flow regulating valve 83, the gas is precisely measured by the gas flowmeter 84 and then enters the pipeline node before the standard meter 44 at the output end of the first water tank 211, where it mixes with the liquid to form a gas-liquid two-phase flow for testing the influence of different gas-liquid contents on the performance of the flowmeter.

[0059] In this embodiment, the liquid flow direction can be from the first water tank 211, passing through pipeline control components (such as water pump 41, pressure stabilizing tank 42, flow regulating valve 43, etc.) and then reaching the tested workbench 50; the gas follows the path of air compressor 81 - air storage tank - flow regulating valve 83 - gas flowmeter 84 - pipeline node to mix with the liquid. During the test: control the liquid flow rate by adjusting the frequency of the pump 41 and the opening of the flow regulating valve 43, and manually adjust the opening of the gas flow regulating valve 83 and observe the reading of the gas flowmeter 84 to control the gas flow rate. During the adjustment process, closely monitor the change of the flow rate to ensure the required gas-liquid ratio is achieved to simulate the actual working conditions.

[0060] During the test, compare the flow rate data of the standard flow meter 44 and the flow meter under test to complete the test of the flow meter under test under gas-liquid two-phase flow conditions. The test flow meter caliber range is DN10 - DN100, the gas-liquid ratio range is 0.4% - 99.8%, the test flow rate range is (0.01 – 280) m³ / h, and the detectable flow meter types include mass, electromagnetic flow meters, and vortex flow meters.

[0061] Continue to refer to Figure 1 As shown in, in some embodiments, an elbow section 46 is provided at the pipeline node before and / or after the workbench 50 under test at the output end of the first water tank 211. Taking the DN50 pipe section as an example, the front straight pipe section can be adjusted within the range of 0 / 2D / 5D / 7D / 10D / 12D / 15D, and the rear straight pipe section can be adjusted within the range of 0D / 2D / 5D. These elbow sections and straight pipe sections of different lengths are usually made of the same material as the main pipeline to ensure fluid compatibility and pipeline system stability. When adjusting the lengths of the front and rear straight pipe sections, it is achieved through specific connecting components, such as using pipe section joints with adjustable lengths, or by combining and installing standard pipe sections with different length specifications.

[0062] Before the test, adjust the length of the pipeline according to specific test requirements. For example, if you want to test the performance of the flow meter under test with a shorter front straight pipe section and a longer rear straight pipe section, you can set the front straight pipe section to 2D and the rear straight pipe section to 5D. At the same time, precisely control the water flow path by controlling the opening or closing state of the corresponding valves. Open the pipeline control components related to the first water tank 211 to make the water flow through the adjusted pipeline and the workbench 50 under test. Adjust the water flow rate to an appropriate test value by adjusting components such as the flow rate regulating valve 43, generally within the range of (0.01 - 40) m³ / h. Then observe the flow rate data of the standard flow meter 44 and the flow meter under test, compare the measurement results of the two, and judge whether the metering performance of the flow meter under test is affected under different long straight pipe section conditions.

[0063] For example, in some actual industrial pipeline systems, the installation layout of the pipeline may have various elbows and straight pipe sections of different lengths. Through the test of this device, the accuracy and reliability of the flow meter under these actual conditions can be evaluated. The test flow meter caliber range is DN10 - DN50, and the types of flow meters to be inspected can include mass, electromagnetic flow meters, and vortex flow meters. When testing flow meters of different calibers, it is necessary to adjust the size specifications of the elbow section and the straight pipe section according to the actual situation to adapt to the installation requirements of different flow meters.

[0064] Refer to Figure 1 and Figure 4, in some embodiments, the device further includes a pressure withstand test bench 90, which includes: a left pipe section 91 and a right pipe section 92 arranged on the workbench. There is a measured meter installation position 93 between the left pipe section 91 and the right pipe section 92 for installing the flow meter to be measured; a pressurizing device is connected to the right pipe section 92, and a pressure withstand meter (not shown in the figure) is provided on the right pipe section 92 for indicating the current pressurizing value.

[0065] The left pipe section 91 is connected to the pipeline node before the standard measuring meter 44 at the output end of the first water tank 211, and the right pipe section 92 is connected to the pipeline node after the standard measuring meter 44 at the output end of the first water tank 211. In this way, the pressure withstand test bench 90 is integrated into the test loop of the water flow standard device to test the influence of the wall thickness of the mass flow meter and electromagnetic flow meter on the zero point stability under pressure changes.

[0066] When performing the pressure withstand test, first correctly place the tooling of the left pipe section 91 and the right pipe section 92, and install the flow meter to be measured with a caliber range of DN10 - DN100, where the flange specifications of DN10 - DN50 apply to the pressure grades of PN10 - PN100; the flange specifications of DN65 - DN100 apply to the pressure grades of PN10 - PN40, on the measured meter installation position 93 and connect all components. Then adjust the table position to the full pipe static state and close the valves of the left and right pipe sections 91 and 92. Next, add water and pressurize the system through the pressurizing device 94. For example, the pressure can be increased to a certain test value, and the pressure test range is (0 - 10) MPa. During the pressurizing process, adjust the frequency of the pump 41 and the opening of the flow regulating valve 43 to control the liquid flow rate, and at the same time closely observe the pressure indication of the pressure withstand meter 95 and the flow data of the standard measuring meter 44 and the flow meter to be measured. By monitoring the performance of the flow meter to be measured during the pressure change process, such as the accuracy of flow measurement, zero point stability, etc., judge whether the performance of the flow meter to be measured meets the requirements under the pressure withstand test conditions. For example, when detecting the influence of the wall thickness of the electromagnetic flow meter on the zero point stability, this pressure withstand test process can be used for experiments to provide an important reference basis for the design and application of the flow meter.

[0067] In some embodiments, the device further includes: a pipe section connection conversion device connected to the workbench 50 to be measured. This device is configured to connect multiple pipe sections with different wall thicknesses and materials. For example, the pipe section material can be 304 stainless steel, carbon steel, and the wall thickness can be 2.75mm, 4mm, 7mm, etc. The pipe section connection conversion device 100 usually adopts a modular design and is composed of multiple connection components adapted to different pipe diameters, wall thicknesses and materials, with good versatility and interchangeability. These connection components adopt special sealing and fixing structures to ensure the sealing performance and stability when connecting different pipe sections, preventing water leakage and pipe section loosening.

[0068] When conducting tests, according to specific test requirements, a suitable pipe section is selected and installed on the workbench 50 to be tested through the pipe section connection conversion device. The pipeline control components related to the first water tank 211 are opened to allow water to flow through the selected pipe section and the workbench 50 to be tested. By adjusting components such as the flow regulating valve 43, the water flow rate is adjusted to a preset test value, generally within the range of (0.01–40) m³ / h. Then, the flow rate data of the standard flow meter 44 and the flow meter to be tested are compared to determine whether the metering performance of the flow meter to be tested changes under pipe sections with different wall thicknesses and materials.

[0069] The water flow rate standard device provided by the embodiment of the present utility model realizes the integration of multiple working conditions by improving the structure of the traditional water flow rate standard device. In addition to testing various liquid flow meters under standard working conditions, it also has the capabilities of testing high and low temperature media, high and low temperature actual flow ring temperature, low conductivity, micro flow, gas-liquid two-phase flow, different long straight pipe sections, pressure resistance, pipe sections with different wall thicknesses / materials, etc., effectively solving the problem of the single function of the traditional water flow rate standard device. It can be used for parameter calibration, detection, and prototype experiments of various liquid flow meters such as electromagnetic flow meters, ultrasonic flow meters, and mass flow meters.

[0070] It should be noted that in this article, terms such as "upper" and "lower" indicating the orientation or positional relationship are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. Relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "including", "comprising", or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements not only includes those elements but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article, or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article, or device including the said element. Those of ordinary skill in the art can understand through specific circumstances.

[0071] The above are only the specific embodiments of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present utility model should be covered within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.

Claims

1. A water flow standard device, characterized in that: include: commutator; At least two water tanks are arranged on the output end pipeline of the commutator, and the at least two water tanks include a first water tank and a second water tank; wherein, The output ends of the first water tank and the second water tank are respectively connected to the workbench under test via pipeline control components, and are looped back to the input end of the commutator via the workbench under test; wherein, the workbench under test is configured to install the flow meter under test, the first water tank is configured as a normal temperature water tank, and the second water tank is configured as a high temperature or low temperature water tank.

2. The water flow standard device according to claim 1, characterized in that: The at least two water tanks also include: a third water tank, the third water tank is configured as a low-temperature or high-temperature water tank, the third water tank and the second water tank are arranged in parallel, and the output end is connected to the workbench under test via the pipeline control component, and is looped back to the input end of the commutator via the workbench under test; wherein, when the third water tank is configured as a low-temperature water tank, the second water tank is configured as a high-temperature water tank; when the third water tank is configured as a high-temperature water tank, the second water tank is configured as a low-temperature water tank.

3. The water flow standard device according to claim 2, characterized in that: The water inlet of the second water tank or the third water tank is connected to a low-conductivity water tank.

4. The water flow standard device according to claim 1, characterized in that: A weighing device is provided between the output end of the commutator and each water tank, and the pipeline control components include: a water pump, a pressure-stabilizing tank, a flow regulating valve, a standard meter and a stop valve, wherein the output ends of the first water tank and the second water tank are respectively connected to the workbench to be tested via the water pump, the pressure-stabilizing tank and the flow regulating valve, and are looped back to the input end of the commutator via the standard meter and the stop valve; The pipeline control component is provided in one set corresponding to the first water tank and the second water tank respectively, or the pipeline control component is provided in one set corresponding to the first water tank and the second water tank.

5. The water flow standard device according to claim 4, characterized in that: The device also includes: a high and low ambient temperature test bench, which includes: a high and low ambient temperature box, in which a workbench to be tested is arranged, the input end of the high and low ambient temperature box is connected to the pipeline node after the flow regulating valve of the first water tank, and the output end of the high and low ambient temperature box is connected to the pipeline node at the front end of the standard meter.

6. The water flow standard device according to claim 1, characterized in that: The device further comprises: a high-level water tank, the output end of which is connected to a pipeline node before a pressure-stabilizing tank arranged at the output end of the second water tank.

7. The water flow standard device according to claim 1, characterized in that: The device also includes: an air compressor, an air storage tank, a flow regulating valve and a gas flow meter, the output end of the air compressor is connected to the air inlet of the air storage tank, the air outlet of the air storage tank is connected to one end of the gas flow meter via the flow regulating valve, and the other end of the gas flow meter is connected to the pipeline node before the standard meter at the output end of the first water tank.

8. The water flow standard device according to claim 1, characterized in that: A curved pipe section is provided on the pipeline node before and / or after the workbench to be tested at the output end of the first water tank.

9. The water flow standard device according to claim 1, characterized in that: The device further comprises: a pressure test bench, the pressure test bench comprising: a left pipe section and a right pipe section arranged on the workbench, a measuring meter installation position is arranged between the left pipe section and the right pipe section, a pressurizing device is connected to the right pipe section, and a pressure meter is arranged on the right pipe section; The left pipe section is connected to a pipeline node before the standard meter at the output end of the first water tank, and the right pipe section is connected to a pipeline node after the standard meter at the output end of the first water tank.

10. The water flow standard device according to claim 1, characterized in that: The device also includes: a pipe segment connection conversion device connected to the workbench to be tested, configured to connect multiple pipe segments with different wall thicknesses and materials.

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