Non-full pipe flowmeter production test device and method

Abstract

The present invention discloses a production test device and method for a non-full pipe flowmeter, including a horizontally arranged measurement channel. One end of the measurement channel is connected to a water supply device, and the other end of the measurement channel is connected to a measurement device. The measurement device includes a liquid volume measurement device and a liquid weight measurement device. The water supply device is used to provide water during the test and ensure the constancy of the water pressure. The measurement channel is horizontally arranged to ensure the smooth flow of water, prevent the occurrence of water flow fluctuations and waves, which may lead to inaccurate measurement and test failure. The measurement device can measure by volume or by weight. Volume measurement is convenient for the measurer to directly read the value, and weight measurement is convenient for realizing automatic output of results.

Description

Technical Field

[0001] The present invention relates to the field of flowmeter detection, and particularly to a production test device and method for non-full pipe flowmeters. Background Art

[0002] The electromagnetic flowmeter belongs to a kind of velocity flowmeter, which is an instrument for measuring the flow rate of conductive fluids by electromagnetic induction. Its principle is to place a magnetic field in a direction perpendicular to the fluid flow. When the conductive fluid passes through, an induced electromotive force is generated due to the fluid cutting the magnetic force lines, and this induced electromotive force is led out by two electrodes. When the magnetic field strength remains unchanged and the pipe diameter is fixed, the magnitude of this induced electromotive force is only related to the flow velocity of the fluid. By converting the induced signal into the magnitude of the flow velocity, the flow rate value can be determined. Its advantage is that there are no moving parts or parts protruding into the pipeline inside the measurement pipeline, so the pressure loss is very small. The volume flow rate measured by the electromagnetic flowmeter is actually not significantly affected by changes in the density, viscosity, temperature, and pressure of the fluid, and it can also be applied to the measurement of corrosive fluids, so it is widely used in industrial production.

[0003] At present, most electromagnetic flowmeters on the market can only be used for full pipe flow measurement. For the situation where the fluid does not fill the pipeline or during the conversion process between full pipe and non-full pipe of the fluid, since the cross-sectional area of the fluid inside the pipe is no longer the cross-sectional area of the measurement pipe, the results obtained by traditional flowmeters are inaccurate. Therefore, the detection method for non-full pipe flowmeters needs to consider two parameters, namely the average flow velocity of the fluid inside the measurement pipe and the liquid level height, and then calibrate them. Summary of the Invention

[0004] The object of the present invention is to provide a production test device and method for non-full pipe flowmeters. Through the testing and detection of non-full pipe flowmeters, the calibration of non-full pipe flowmeters can be achieved, and it can be detected whether the non-full pipe flowmeters meet the standards, ensuring the quality of products leaving the factory.

[0005] The technical solution adopted by the present invention is as follows:

[0006] The production test device for non-full pipe flowmeters includes a horizontally arranged measurement channel. One end of the measurement channel is connected to a water supply device, and the other end is connected to a measurement device. The measurement device includes a liquid volume measurement device and a liquid weight measurement device. The water supply device is used to provide water during the test process and ensure the constancy of the water pressure. The measurement channel is horizontally arranged to ensure the smooth flow of water, preventing problems such as water flow fluctuations and waves from occurring, which may lead to inaccurate measurement and test failure. The measurement device can measure by volume or by weight. Measuring by volume is convenient for the measurer to directly read the value, and measuring by weight is convenient for realizing automatic output of results.

[0007] Further, the present invention discloses an optimized structure of a non-full pipe flowmeter production test device. A non-full pipe flowmeter is provided in the middle of the measurement channel, and a flowmeter standard meter is connected to the front end of the non-full pipe flowmeter; a flowmeter outlet measurement pipe is connected to the rear end of the non-full pipe flowmeter, and the rear end of the flowmeter outlet measurement pipe is connected to a drain pipe through a tee. The flowmeter standard meter is used to measure its standard data. The drain pipe is used to detect the calibration when the pipe is full.

[0008] Further, the rear end of the flowmeter outlet measurement pipe is connected to a second electric valve through a tee, and the water outlet end of the second electric valve is communicated with the measurement device through a pipe.

[0009] Further, a first electric valve is connected to the front end of the flowmeter standard meter, and the front end of the first electric valve is connected to a water supply device.

[0010] Further, the water supply device includes a water pump. The input end of the water pump is connected to a water source through a pipe, the output end of the water pump is communicated with the first electric valve, and the height of the water pump is lower than that of the measurement channel.

[0011] Further, the horizontal height of the water outlet of the drain pipe is higher than that of the measurement channel; the length of the flowmeter outlet measurement pipe is greater than or equal to 10 times the pipe diameter of the non-full pipe flowmeter. By lengthening the length of the flowmeter outlet measurement pipe, the smoothness of the water flow is ensured, and accurate testing is guaranteed.

[0012] Further, the measurement device includes an electronic platform scale, and a measuring cylinder is arranged on the electronic platform scale. The measuring cylinder is communicated with the water outlet end of the second electric valve.

[0013] Further, it includes a control center. The water pump, the first electric valve, the flowmeter standard meter, the non-full pipe flowmeter, the second electric valve, and the electronic platform scale are signal-connected to the control center through cables. The control center is used to control the operation of the water pump, the first electric valve, and the second electric valve, and is used to receive the data collected by the flowmeter standard meter, the non-full pipe flowmeter, and the electronic platform scale.

[0014] A test method based on the non-full pipe flowmeter production test device includes the following steps:

[0015] 1. First, calibrate the empty pipe parameters of the flowmeter when the pipe is dry.

[0016] 2. When water is flowing, open the first electric valve. When water enters the measuring cylinder, immediately turn off the water pump and the first electric valve to fill the entire pipe of the non-full pipe flowmeter with water, and perform zero calibration when the water is stationary.

[0017] 3. Calibration of the full-scale of a non-full pipe flowmeter when the pipe is full; after zeroing the reading of the electronic platform scale, open the first electric valve, start the water pump, adjust the first electric valve so that the flow rate reaches the full-scale value of the non-full pipe flowmeter, and finally drain the liquid passing through the non-full pipe flowmeter into the measuring cylinder through the drain pipe, read the value M of the electronic platform scale, and calculate the weight of the liquid passing through the non-full pipe flowmeter within the set time and the cumulative flow value displayed by the non-full pipe flowmeter;

[0018] 4. Flow calibration of a non-full pipe flowmeter when the pipe is non-full.

[0019] Furthermore, the present invention discloses a preferred implementation step of a test method based on a production test device for a non-full pipe flowmeter. In step 4, it includes the following steps:

[0020] a. Conduct a water passing test on the non-full pipe flowmeter. Open the second electric valve, and the water flow directly enters the measuring cylinder during the entire test process;

[0021] b. Simulate different pipeline resistances by adjusting the second electric valve at the rear, and make the liquid level area account for 10%, 30%, 50%, 80%, and 100% of the full pipe ratio through the first electric valve. During the measurement process, it is required that the liquid flow rate is 10% - 100% of the flow rate corresponding to the full scale of the non-full pipe flowmeter, preferably 50%;

[0022] c. Record the flow value q of the non-full pipe flowmeter, use the platform scale to weigh the measuring cylinder M, and the density of water is c;

[0023] d. Since v = M / c and c = 1, then M = v. From q = v / t, the calibration coefficient of the non-full pipe flowmeter in different states can be calculated.

[0024] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0025] 1. Through this device, the non-full pipe flowmeter can be tested to detect its measurement accuracy and reliability, and the non-full pipe flowmeter can be calibrated;

[0026] 2. By setting up a special detection device for the non-full pipe flowmeter, the detection efficiency of the non-full pipe flowmeter can be greatly improved, and the detection automation level can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram of the present invention;

[0028] Figure 2 is the detection structural schematic diagram of the present invention during full pipe detection;

[0029] Figure 3It is a schematic diagram of the detection structure when the present invention detects a non-full pipe;

[0030] Markings in the figure: 1 is a water pump, 2 is a first electric valve, 3 is a standard flowmeter, 4 is a non-full pipe flowmeter, 5 is a measurement pipeline at the outlet of the flowmeter, 6 is a second electric valve, 7 is a measuring cylinder, 8 is an electronic platform scale, 9 is a control center, and 10 is a drain pipe. Specific implementation mode

[0031] The present invention will be described in detail below with reference to the accompanying drawings.

[0032] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] Embodiment 1:

[0034] As Figure 1 shown, a non-full pipe flowmeter production test device includes a horizontally arranged measurement channel. One end of the measurement channel is connected to a water supply device. The water supply device includes a water pump 1. The input end of the water pump 1 is connected to a water source through a pipeline. The output end of the water pump 1 is communicated with a first electric valve 2. The height of the water pump 1 is lower than that of the measurement channel.

[0035] The water outlet end of the first electric valve 2 is connected to a standard flowmeter 3; the standard flowmeter 3 is connected to a non-full pipe flowmeter 4 to be tested. The front end of the non-full pipe flowmeter 4 is connected to the standard flowmeter 3; the rear end of the non-full pipe flowmeter 4 is connected to a measurement pipeline 5 at the outlet of the flowmeter. The rear end of the measurement pipeline 5 at the outlet of the flowmeter is connected to a drain pipe 10 through a tee. The horizontal height of the water outlet of the drain pipe 10 is higher than that of the measurement channel; the length of the measurement pipeline 5 at the outlet of the flowmeter is greater than or equal to 10 times the pipe diameter of the non-full pipe flowmeter 4. By lengthening the length of the measurement pipeline 5 at the outlet of the flowmeter, the smoothness of the water flow is ensured, and accurate testing is ensured. The standard flowmeter 3 is used to measure its standard data. The drain pipe 10 is used for calibration when the pipe is full.

[0036] The rear end of the measurement pipeline 5 at the outlet of the flowmeter is connected to a second electric valve 6 through a tee. The water outlet end of the second electric valve 6 is communicated with a measurement device through a pipeline. The other end of the measurement channel is connected to a measurement device. The measurement device includes a liquid volume measurement device and a liquid weight measurement device. The measurement device includes an electronic platform scale 8. A measuring cylinder 7 is arranged on the electronic platform scale 8. The measuring cylinder 7 is communicated with the water outlet end of the second electric valve 6.

[0037] The water supply device is used to provide water during the test and ensure the constancy of water pressure; the measurement channel is set horizontally to ensure the smooth flow of water, prevent water flow fluctuations and waves from occurring, which may lead to inaccurate measurement and test failure. The measuring device can measure by volume or by weight. Volume measurement is convenient for the surveyor to directly read the value, and weight measurement is convenient for realizing automatic output of results.

[0038] It includes a control center 9, and the water pump 1, the first electric valve 2, the standard flowmeter 3, the non-full pipe flowmeter 4, the second electric valve 6, and the electronic platform scale 8 are connected to the control center 9 through cables for signal connection. The control center 9 is used to control the operation of the water pump 1, the first electric valve 2, and the second electric valve 6, and is used to receive the data collected by the standard flowmeter 3, the non-full pipe flowmeter 4, and the electronic platform scale 8.

[0039] During the specific operation process, the non-full pipe flowmeter 4 to be tested is connected to the test platform. Start the equipment.

[0040] First, calibrate the empty pipe parameters of the flowmeter under the condition of a dry pipeline. Zero the electronic platform scale 8, dry the measuring cylinder 7, and record the output data of the non-full pipe flowmeter 4 in the empty pipe state through the control center 9. Then perform full pipe calibration. Close the second electric valve 6, start the water pump 1 through the control center 9, and open the first electric valve 2 until the water fills the measuring pipeline and is stationary. Record the state of the non-full pipe flowmeter 4 in this case.

[0041] Then conduct a full pipe test. Start the water pump 1 through the control center 9, open the first electric valve 2, and the second electric valve 6 is in the closed state. Adjust the first electric valve 2 to make the water flow tend to be stable, usually set to 50% of the maximum flow rate. The water flows along the water pump 1, the first electric valve 2, the standard flowmeter 3, the non-full pipe flowmeter 4, the flowmeter outlet measuring pipeline 5, and the drain pipe 10, as Figure 2 shown.

[0042] Adjust the first electric valve 2 to make the flow rate reach the full scale value of the non-full pipe flowmeter 4. Drain the liquid passing through the non-full pipe flowmeter 4 into the measuring cylinder 7 through the drain pipe 10 finally. Read the value M of the electronic platform scale 8, and calculate the weight of the liquid passing through the non-full pipe flowmeter 4 within the set time and the cumulative flow value displayed by the non-full pipe flowmeter 4 to achieve calibration under the full pipe state.

[0043] Then conduct non-full pipe calibration. The non-full pipe flowmeter 4 conducts a water passing test, and open the second electric valve 6. The water flow during the whole test process directly enters the measuring cylinder 7; as Figure 3As shown in the figure; by adjusting the second electric valve 6 at the rear to simulate different pipeline resistances, and by adjusting the first electric valve 2 to make the liquid area occupy 10%, 30%, 50%, 80%, and 100% of the pipe ratio. During the measurement process, it is required that the liquid flow rate is 10% - 100% of the flow rate corresponding to the full scale of the non-full pipe flowmeter 4, preferably 50%; record the flow value q of the non-full pipe flowmeter 4, use a platform scale to weigh the measuring cylinder 7M, the density of water is c; since v = M / c and c = 1, then M = v, and from q = v / t, the calibration of the non-full pipe flowmeter 4 under different states can be calculated.

[0044] In this way, the non-full pipe flowmeter can be tested to detect its measurement accuracy and reliability, and the non-full pipe flowmeter can be calibrated; by setting a special detection device for the non-full pipe flowmeter, the detection efficiency of the non-full pipe flowmeter can be greatly improved, and the detection effect can be improved.

[0045] Embodiment 2:

[0046] The present invention also discloses a test method based on a production test device for a non-full pipe flowmeter, including the following steps:

[0047] 1. First, calibrate the empty pipe parameters of the flowmeter when the pipeline is dry.

[0048] 2. When water is flowing, open the first electric valve 2. When water enters the measuring cylinder 7, immediately close the water pump 1 and the first electric valve 2 to fill the entire pipeline of the non-full pipe flowmeter 4 with water, and perform zero calibration when the water is stationary.

[0049] 3. Measure the full scale calibration of the non-full pipe flowmeter 4 when it is full; after zeroing the reading of the electronic platform scale 8, open the first electric valve 2, start the water pump 1, adjust the first electric valve 2 to make the flow rate reach the full scale value of the non-full pipe flowmeter 4, and finally drain the liquid passing through the non-full pipe flowmeter 4 into the measuring cylinder 7 through the drain pipe 10, read the value M of the electronic platform scale 8, and calculate the liquid weight passing through the non-full pipe flowmeter 4 within the set time and the cumulative flow value displayed by the non-full pipe flowmeter 4.

[0050] 4. Measure the flow calibration of the non-full pipe flowmeter 4 when it is non-full.

[0051] Among them, in step 4, it includes the following steps:

[0052] a. Conduct a water passing test on the non-full pipe flowmeter 4, open the second electric valve 6, and the water flow directly enters the measuring cylinder 7 during the entire test process.

[0053] b. By adjusting the second electric valve 6 at the rear to simulate different pipeline resistances, and making the liquid area occupy 10%, 30%, 50%, 80%, and 100% of the pipe cross-sectional area through the first electric valve 2. During the measurement process, it is required that the liquid flow rate is 10% - 100% of the flow rate corresponding to the full scale of the non-full pipe flowmeter 4, preferably 50%;

[0054] c. Record the flow value q of the non-full pipe flowmeter 4, and use a platform scale to weigh the measuring cylinder 7M. The density of water is c;

[0055] d. Since v = M / c and c = 1, then M = v. From q = v / t, the calibration coefficient of the non-full pipe flowmeter 4 under different conditions can be calculated.

[0056] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A testing method for a production testing device of a non-full pipe flowmeter, characterized in that: the testing device includes a horizontally arranged measurement channel, one end of the measurement channel is connected with a water supply device, the other end of the measurement channel is connected with a measuring device, and the measuring device includes a liquid volume measuring device and a liquid weight measuring device; a non-full pipe flowmeter (4) is arranged in the middle of the measurement channel, and a flowmeter standard meter (3) is connected to the front end of the non-full pipe flowmeter (4); a flowmeter outlet measurement pipeline (5) is connected to the rear end of the non-full pipe flowmeter (4), and the rear end of the flowmeter outlet measurement pipeline (5) is connected with a drain pipe (10) through a tee pipe; the rear end of the flowmeter outlet measurement pipeline (5) is connected with a second electric valve (6) through a tee pipe, and the water outlet end of the second electric valve (6) is communicated with the measuring device through a pipeline; a first electric valve (2) is connected to the front end of the flowmeter standard meter (3), and the front end of the first electric valve (2) is connected with the water supply device; the water supply device includes a water pump (1), the input end of the water pump (1) is connected with a water source through a pipeline, the output end of the water pump (1) is communicated with the first electric valve (2), and the height of the water pump (1) is lower than that of the measurement channel; the measuring device includes an electronic platform scale (8), a measuring cylinder (7) is arranged on the electronic platform scale (8), and the measuring cylinder (7) is communicated with the water outlet end of the second electric valve (6); the testing method includes the following steps: firstly, calibrate the empty pipe parameters of the flowmeter when the pipeline is dry; under the condition of water flowing, open the first electric valve (2), when water enters the measuring cylinder (7), immediately close the water pump (1) and the first electric valve (2), let water fill the entire pipeline of the non-full pipe flowmeter (4), and perform zero point calibration under the condition of still water; calibrate the full scale of the non-full pipe flowmeter (4) when it is full of water; after zeroing the reading of the electronic platform scale (8), open the first electric valve (2), start the water pump (1), adjust the first electric valve (2) so that the flow rate reaches the full scale value of the non-full pipe flowmeter (4), drain the liquid passing through the non-full pipe flowmeter (4) into the measuring cylinder (7) through the drain pipe (10) finally, read the value M of the electronic platform scale (8), and calculate the liquid weight passing through the non-full pipe flowmeter (4) within the set time and the cumulative flow value displayed by the non-full pipe flowmeter (4); calibrate the flow rate of the non-full pipe flowmeter (4) when it is not full of water.

2. The testing method for a production testing device of a non-full pipe flowmeter according to claim 1, characterized in that: the horizontal height of the water outlet of the drain pipe (10) is higher than that of the measurement channel; the length of the flowmeter outlet measurement pipeline (5) is greater than or equal to 10 times the pipeline diameter of the non-full pipe flowmeter (4).

3. The testing method for a production testing device of a non-full pipe flowmeter according to claim 1, characterized in that: It includes a control center (9), and the water pump (1), the first electric valve (2), the standard flowmeter (3), the non-full pipe flowmeter (4), the second electric valve (6), and the electronic platform scale (8) are connected to the control center (9) through cables for signal connection.

4. The test method of a non-full pipe flowmeter production test device according to claim 1, characterized in that the flow calibration of the non-full pipe flowmeter (4) when measuring non-full pipes includes the following steps: a. The non-full pipe flowmeter (4) is subjected to a water passing test, the second electric valve (6) is opened, and the water flow during the whole test process directly enters the measuring cylinder (7); b. Different pipe resistances are simulated by adjusting the second electric valve (6) at the rear, and the liquid level area of the liquid accounts for 10%, 30%, 50%, 80%, and 100% of the full pipe ratio through the first electric valve (2). During the measurement process, it is required that the liquid flow velocity is 10%-100% of the flow velocity corresponding to the nominal full scale of the non-full pipe flowmeter (4); c. Record the flow value q of the non-full pipe flowmeter (4), and use the platform scale to weigh the measuring cylinder (7) as M, and the density of water is c; d. Since v = M / c and c = 1, then M = v, and from q = v / t, the calibration coefficient of the non-full pipe flowmeter (4) in different states can be calculated.

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