A flow calibration device for bend pipe turbulence testing

Abstract

This application relates to a flow calibration device for testing turbulence in a bend pipe, comprising: a water storage tank and a pump body; a test pipeline including a first valve body and a test bend pipe, the test bend pipe being detachably installed on a straight pipe; a test flow meter; a flow regulating valve; a standard flow meter; a container with an electronic scale installed below; a reversing device selectively connected to the container or the water storage tank; and a drainage pipeline including a first drain valve disposed between the test flow meter and the water storage tank and a second drain valve disposed between the container and the water storage tank. This device can test the metering performance of the test flow meter before installing the test bend pipe, and then test the metering performance of the test flow meter after installing the test bend pipe. The spacing of the test bend pipes and the distance between the test bend pipe and the test flow meter are adjustable, thereby determining the impact of the turbulence formed by the test bend pipe on the metering performance of the test flow meter. In practical use, corrections can be made based on the error, thereby improving the accuracy of flow measurement.

Description

Technical Field

[0001] This application relates to the field of flow measurement technology, specifically to a flow calibration device for bend pipe turbulence testing. Background Technology

[0002] As an important component of scientific metrology, flow measurement mainly realizes the quantitative measurement of fluid flow rate and has a wide range of applications in many fields such as trade settlement, energy measurement, chemical production, environmental protection, and medicine and health.

[0003] The metering performance of commonly used flow meters in current industrial scenarios (such as electromagnetic flow meters, ultrasonic flow meters, vortex flow meters, differential pressure flow meters, etc.) is highly dependent on the on-site installation conditions. Factors such as pipe vibration, full pipe state of medium, flow field uniformity, and straight pipe length can all have a significant impact on metering accuracy.

[0004] However, in actual industrial layouts, due to limited space in production sites, it is impossible to reserve a sufficiently long straight pipe section according to ideal installation requirements. As a result, the flow meter is often installed directly at the rear end of the bend, which causes non-uniform turbulence (such as vortices, deflection, etc.) to be generated during the flow of fluid through the bend. Such turbulence will disrupt the stable flow field environment required by the flow meter, thereby causing measurement errors and affecting measurement accuracy.

[0005] Therefore, it is necessary to improve the existing technology to overcome the aforementioned defects. Utility Model Content

[0006] In view of this, this application provides a flow calibration device for bend pipe turbulence testing to solve at least one problem existing in the background art, comprising:

[0007] The water supply pipeline includes a water storage tank and a pump body, wherein the pump body is used to output water from the water storage tank;

[0008] The test pipeline includes a first valve body and a test bend, the test bend being detachably mounted on the straight pipeline;

[0009] A test flow meter is connected downstream of the test bend;

[0010] A flow regulating valve, connected downstream of the test flow meter, is used to regulate the flow rate that can pass through the pipeline;

[0011] A standard flow meter is connected downstream of the flow regulating valve;

[0012] The container has an electronic scale installed at the bottom;

[0013] A commutator is connected downstream of a standard flow meter, and a shut-off valve is provided between the commutator and the standard flow meter. The commutator can be selectively connected to the container or water storage tank.

[0014] The drainage pipeline includes a first drain valve disposed between the test flow meter and the water storage tank and a second drain valve disposed between the container and the water storage tank.

[0015] Optionally, the flow calibration device for the above-mentioned bend turbulence test includes a first state without the test bend installed and a second state with the test bend installed.

[0016] In the first state, the length of the upstream straight pipe of the test flow meter is at least 10 times the nominal diameter, and the length of the downstream straight pipe of the test flow meter is at least 5 times the nominal diameter.

[0017] Optionally, the flow calibration device for the above-mentioned bend turbulence test further includes a pressure stabilizing tank connected to the pump body and a first pressure gauge installed on the pressure stabilizing tank, wherein the first pressure gauge is used to measure the pressure of the pressure stabilizing tank.

[0018] Optionally, the flow calibration device for the above-mentioned bend turbulence test further includes a check valve disposed between the pressure stabilizing tank and the pump body in the water supply pipeline.

[0019] Optionally, the flow calibration device for the above-mentioned bend turbulence test further includes a second pressure gauge disposed between the first valve body and the water supply pipeline.

[0020] Optionally, the flow calibration device for the above-mentioned bend turbulence test further includes a temperature sensor disposed between the test flow meter and the first drain valve in the test pipeline.

[0021] Optionally, in the above-mentioned flow calibration device for bend turbulence testing, the test flow meter is an external clamp-on ultrasonic flow meter.

[0022] Optionally, in the above-mentioned flow calibration device for bend turbulence testing, the flow regulating valve has an adjustable opening and at least three different flow regulating points corresponding to different pipe flow rates.

[0023] Optionally, in the flow calibration device for the above-mentioned bend turbulence test, the distance between the test flow meter and the test bend is adjustable.

[0024] Compared with the prior art, this application has the following beneficial effects: by setting up a water supply pipeline, a test pipeline, a test flow meter, a standard flow meter, a container, an electronic scale for weighing the container and a commutator, and a drainage pipeline, and with the test bend in the test pipeline being detachably installed in the pipeline, the test bend can simulate the non-uniform turbulence environment caused by the bend in an industrial scenario. This allows the device to first test the metering performance of the test flow meter under normal conditions without installing the test bend, and then test the metering performance of the test flow meter after installing the test bend. The spacing of the test bends and the distance between the test bends and the test flow meter are adjustable, thereby determining the impact of the turbulence formed by the test bend on the metering performance of the test flow meter. In actual use, the error can be corrected, thereby improving the accuracy of flow measurement. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structural connection of the flow calibration device for the bend turbulence test shown in this application in the second state.

[0026] Figure 2 for Figure 1 The diagram shows the structure of the test bend in the water flow calibration device.

[0027] Reference numerals in the attached drawings: 1. Water storage tank; 2. Pump body; 3. Check valve; 4. Pressure stabilizing tank; 5. First pressure gauge; 6. Second pressure gauge; 7. First valve body; 8. Test bend; 9. Gauge expansion joint; 10. Test flow meter; 11. Temperature sensor; 12. Flow regulating valve; 13. Standard flow meter; 14. Shut-off valve; 15. Reversing device; 16. Container; 17. Electronic scale; 18. First drain valve; 19. Second drain valve. Detailed Implementation

[0028] The exemplary embodiments disclosed in this application will now be described in more detail. Numerous specific details are set forth in the following description to provide a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without one or more of these details. In other instances, to avoid confusion with this application, some technical features well-known in the art have not been described; that is, not all features of actual embodiments are described herein, nor are well-known functions and structures described in detail.

[0029] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this application, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion. And the discussion of a second element, component, area, layer, or portion does not imply that the first element, component, area, layer, or portion necessarily exists in this application.

[0030] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used here for convenience to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of devices in use and operation.

[0031] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this application. When used herein, the singular forms “a,” “an,” and “ / the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “compose” and / or “comprising,” when used in this specification, identify the presence of features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0032] To fully understand this application, detailed steps and structures will be presented in the following description to illustrate the technical solution of this application. Preferred embodiments of this application are described in detail below; however, in addition to these detailed descriptions, this application may have other implementation methods.

[0033] refer to Figure 1 and Figure 2As shown in the preferred embodiment of this application, a flow calibration device for bend-pipe turbulence testing includes a water supply pipeline, a test pipeline, a flow regulating valve 12 connected downstream of the test pipeline, a standard flow meter 13 connected downstream of the flow regulating valve 12, a reversing device 15 connected downstream of the standard flow meter 13, a container 16 disposed on one side of the reversing device 15, and a drainage pipeline. The water supply pipeline includes a water storage tank 1 and a pump body 2, the pump body 2 being used to output water from the water storage tank 1; the test pipeline includes a first valve body 7 and a test bend 8, the test bend 8 being detachably installed on a straight pipeline; the flow regulating valve 12 is used to regulate the flow rate through the pipeline; a shut-off valve 14 is also provided between the reversing device 15 and the standard flow meter 13; the reversing device 15 can be selectively connected to the container 16 or the water storage tank 1; the drainage pipeline includes a first drain valve 18 disposed between the test flow meter 10 and the water storage tank 1 and a second drain valve 19 disposed between the container 16 and the water storage tank 1.

[0034] It should be noted that in this embodiment, the test flow meter 10 is an external clamp-on ultrasonic flow meter; the commutator 15 is a pneumatic commutator.

[0035] It should be noted that in this embodiment, the water flow calibration device includes a first state without the test bend 8 installed and a second state with the test bend 8 installed; in the first state, the length of the upstream straight pipe of the test flow meter 10 is at least 10 times the nominal diameter, and the length of the downstream straight pipe of the test flow meter 10 is at least 5 times the nominal diameter.

[0036] In this embodiment, the distance between the test flow meter 10 and the test bend 8 is adjustable.

[0037] In this embodiment, the test bend is composed of four flanged stainless steel bends.

[0038] Understandably, by setting up a detachable test bend 8, when the test bend 8 is not installed on the pipeline, a measurement without turbulence under an ideal uniform flow field can be achieved; when the test bend 8 is installed on the pipeline, the non-uniform turbulence state caused by the bend in the industrial field can be simulated, thereby measuring the impact of the bend turbulence on the flow meter's measurement performance.

[0039] Understandably, the flow regulating valve 12 can change the pipeline resistance by adjusting its opening degree, thereby precisely controlling the flow rate through the system, realizing the switching of multiple flow points, and meeting the requirements of full-range calibration of the flow meter. In this embodiment, the flow regulating valve 12 has an adjustable opening degree and at least three different flow regulation points, corresponding to different pipeline flow rates, so as to obtain the influence of bend turbulence on measurement error under different flow rates.

[0040] Understandably, the commutator 15 enables rapid switching of water in the pipeline between the water storage tank 1 and the container 16, thereby improving testing efficiency.

[0041] Understandably, in the first state, the length of the upstream straight pipe of the test flow meter 10 is at least 10 times the nominal diameter, and the length of the downstream straight pipe of the test flow meter 10 is at least 5 times the nominal diameter, in order to ensure that the test flow meter 10 provides an ideal uniform flow field and obtains the flow indication error under normal operating conditions.

[0042] Understandably, the first drain valve 18 between the test flow meter 10 and the water storage tank 1 can completely drain the water in the test pipeline after the test, ensuring safe operation when disassembling and assembling the flow meter after the test and reducing the risk of water splashing. A second drain valve 19 is also provided between the container 16 and the water storage tank 1, which can quickly drain the water in the weighing container 16 back to the water storage tank 1 after weighing.

[0043] Furthermore, the water supply pipeline also includes a pressure stabilizing tank 4 connected to the pump body 2 and a first pressure gauge 5 installed on the pressure stabilizing tank 4. The first pressure gauge 5 is used to measure the pressure of the pressure stabilizing tank 4.

[0044] Understandably, the pressure stabilizing tank 4 can buffer the pressure fluctuations of the water output from the pump body 2, ensuring stable water pressure entering the test pipeline, avoiding flow field disturbances caused by sudden pressure changes, and ensuring the stability of the test flow rate; the first pressure gauge 5 monitors the pressure of the pressure stabilizing tank 4 in real time, making it easy for operators to intuitively grasp the water supply pressure status.

[0045] In this embodiment, the water supply pipeline also includes a check valve 3 installed between the pressure stabilizing tank 4 and the pump body 2, which effectively prevents the water in the pressure stabilizing tank 4 from flowing back to the pump body 2 due to the pressure difference, and avoids water backflow causing damage to the pump body 2.

[0046] Furthermore, the test pipeline also includes a second pressure gauge 6 installed between the first valve body 7 and the water supply pipeline. The second pressure gauge 6 can monitor the water pressure at the inlet of the test pipeline in real time, so that operators can keep track of the fluid flow status in the water supply pipeline and prevent safety issues such as pipeline liquid leakage.

[0047] Furthermore, the test pipeline also includes a temperature sensor 11 installed between the test flow meter 10 and the first drain valve 18 to collect the temperature data of the fluid flowing through the test flow meter 10 in real time.

[0048] The testing process of the flow calibration device shown in this application is as follows: First, the flow calibration device is put into the first state, and the length of the upstream straight pipe of the test flow meter 10 is at least 10 times the nominal diameter, and the length of the downstream straight pipe of the test flow meter 10 is at least 5 times the nominal diameter; then, the pump body 2, the first valve body 7 and the shut-off valve 14 are opened, the reversing device 15 is adjusted to connect the reversing device 15 to the water storage tank 1, the first drain valve 18 and the second drain valve 19 are closed, and then the flow regulating valve 12 is adjusted to the test flow point one. After the flow of the standard flow meter 13 is stable, the reversing device 15 is switched to connect with the container 16 on the electronic scale 17 to start the test. After the test, the commutator 15 is switched to be connected to the water storage tank 1. The data of the electronic scale 17 and the test flow meter 10 are recorded. The indication error of the test flow meter under normal working conditions is calculated based on the data of the test flow meter 10 and the electronic scale 17. Then, the flow regulating valve 12 is adjusted to test flow point two, test flow point three, test flow point four and test flow point five respectively to obtain the indication error of the test flow meter at different flow points.

[0049] The entire flow calibration device is put into the second state. Then, the flow regulating valve 12 is adjusted to test flow point 1, test flow point 2, test flow point 3, test flow point 4, and test flow point 5 respectively to test the test flow meter 10. The data of the electronic scale 17 and the test flow meter 10 under the turbulence state of the bend pipe in the second state are obtained, thereby obtaining the influence of the turbulence generated by the test bend pipe 8 on the metering performance of the test flow meter 10.

[0050] Then, the distance between the test bend 8 and the test flow meter 10 was changed multiple times to obtain the effect of different distances on the metering performance of the test flow meter 10.

[0051] It should be noted that the flow measurement point one can be 100% of the maximum flow of the test flow meter 10, the flow measurement point two can be 75% of the maximum flow of the test flow meter 10, the flow measurement point three can be 50% of the maximum flow of the test flow meter 10, the flow measurement point four can be 25% of the maximum flow of the test flow meter 10, and the flow measurement point five can be 10% of the maximum flow of the test flow meter 10.

[0052] Furthermore, when calculating the flow rate using data obtained from the electronic scale, buoyancy correction is required for the electronic scale. If the flow meter reading is a volumetric quantity, density conversion is also required.

[0053] The buoyancy correction is shown below:

[0054]

[0055] In the formula: m is the corrected mass; air density; The density of the liquid; The standard weight density used when calibrating weighing instruments.

[0056] Density can be measured by checking a temperature-density table after measuring the water temperature with a temperature sensor, or by installing a densitometer on the device or by taking a sample of the medium and measuring it with a densitometer.

[0057] The above is only one specific implementation of this application, and any other improvements made based on the concept of this application shall be considered within the scope of protection of this application.

Claims

1. A flow calibration device for elbow turbulence testing, characterized by, include: The water supply pipeline includes a water storage tank and a pump body, wherein the pump body is used to output water from the water storage tank; The test pipeline includes a first valve body and a test bend, the test bend being detachably mounted on the straight pipeline; A test flow meter is connected downstream of the test bend; A flow regulating valve, connected downstream of the test flow meter, is used to regulate the flow rate that can pass through the pipeline; A standard flow meter is connected downstream of the flow regulating valve; The container has an electronic scale installed at the bottom; A commutator is connected downstream of a standard flow meter, and a shut-off valve is provided between the commutator and the standard flow meter. The commutator can be selectively connected to the container or water storage tank. The drainage pipeline includes a first drain valve disposed between the test flow meter and the water storage tank and a second drain valve disposed between the container and the water storage tank.

2. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The device includes a first state in which the test bend is not installed and a second state in which the test bend is installed. In the first state, the length of the upstream straight pipe of the test flow meter is at least 10 times the nominal diameter, and the length of the downstream straight pipe of the test flow meter is at least 5 times the nominal diameter.

3. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The water supply pipeline also includes a pressure stabilizing tank connected to the pump body and a first pressure gauge installed on the pressure stabilizing tank, the first pressure gauge being used to measure the pressure of the pressure stabilizing tank.

4. The flow calibration apparatus for bent-pipe disturbance testing of claim 3, wherein, The water supply pipeline also includes a check valve installed between the pressure stabilizing tank and the pump body.

5. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The test pipeline also includes a second pressure gauge disposed between the first valve body and the water supply pipeline.

6. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The test pipeline also includes a temperature sensor disposed between the test flow meter and the first drain valve.

7. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The test flow meter is an external clamp-on ultrasonic flow meter.

8. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The flow regulating valve has an adjustable opening and at least three different flow regulation points, corresponding to different pipeline flow rates.

9. The flow calibration apparatus for bent-pipe disturbance testing of claim 1, wherein, The distance between the test flow meter and the test bend is adjustable.

Images