Flowmeter calibration system

Abstract

The application relates to a flow meter calibration system and belongs to the technical field of device calibration. The flow meter calibration system comprises a liquid storage tank, an electromagnetic pump, a standard flow meter, a flow meter to be measured, a first ball valve, a second ball valve and a control unit; a liquid outlet of the liquid storage tank, the first ball valve, the electromagnetic pump, the standard flow meter, the flow meter to be measured, the second ball valve and a liquid inlet of the liquid storage tank are sequentially communicated; the control unit is electrically connected with the electromagnetic pump, the standard flow meter and the flow meter to be measured respectively, and the control unit is used for determining flow deviation values of the standard flow meter and the flow meter to be measured under each rotating speed; and whether the detection accuracy of the flow meter to be measured meets a standard is determined based on the flow deviation values. The application can shorten the required time for flow meter detection.

Description

Technical Field

[0001] This application relates to the field of device calibration technology, and in particular to a flow meter calibration system. Background Technology

[0002] Flow meters are frequently used in engine and transmission development testing, and accurate flow meter measurements are crucial to ensure data accuracy.

[0003] Currently, flowmeters are typically outsourced for periodic calibration. The flowmeters that need to be calibrated are packaged and sent to the metrology institute, which then completes the calibration and returns the calibrated flowmeters, indicating whether the flowmeters are accurate.

[0004] However, the process of packaging the flow meter, sending it to the metering center for calibration, and then sending it back takes at least a month, which results in an excessively long time required for flow meter calibration. Summary of the Invention

[0005] This application provides a flowmeter calibration system that can solve the technical problems existing in related technologies. The technical solution is as follows:

[0006] This application provides a flow meter calibration system, which includes a mounting platform, a liquid storage tank, an electromagnetic pump, a standard flow meter, a flow meter to be tested, a first ball valve, a second ball valve, and a control unit.

[0007] The liquid storage tank is located on the mounting platform and is connected to the mounting platform;

[0008] The inlet of the electromagnetic pump is connected to the outlet of the storage tank via a pipe.

[0009] The inlet of the standard flow meter is connected to the outlet of the electromagnetic pump via a pipe.

[0010] The inlet of the flow meter to be tested is connected to the outlet of the standard flow meter through a pipe, and the outlet of the flow meter to be tested is connected to the inlet of the storage tank through a pipe. The inlet of the flow meter to be tested and the pipe are detachably connected, and the outlet of the flow meter to be tested and the pipe are detachably connected.

[0011] The two ends of the first ball valve are respectively connected to the outlet of the storage tank and the inlet of the electromagnetic pump through pipes, and the two ends of the second ball valve are respectively connected to the outlet of the flow meter to be measured and the inlet of the storage tank through pipes.

[0012] The control unit is electrically connected to the electromagnetic pump, the standard flow meter, and the flow meter to be measured, respectively. The control unit is used for:

[0013] The electromagnetic pump is controlled to run at different speeds to obtain the standard flow rate value detected by the standard flow meter and the flow rate value to be measured detected by the flow meter under test at each speed.

[0014] Based on the standard flow rate value detected by the standard flow meter at each rotational speed and the flow rate value to be measured detected by the flow meter to be measured, the flow deviation value at each rotational speed is determined;

[0015] If the flow deviation value at each rotation speed is less than or equal to the preset error allowable value, then the accuracy of the flow meter under test is determined to meet the standard. If the flow deviation value at any rotation speed is greater than the preset error allowable value, then the accuracy of the flow meter under test is determined to not meet the standard.

[0016] In one possible implementation, the flow meter calibration system further includes a drain assembly, which includes a three-way connector and a third ball valve;

[0017] The three-way connector has a connector inlet, a first connector outlet, and a second connector outlet. The connector inlet is connected to the outlet of the storage tank via a pipe, and the first connector outlet is connected to the inlet of the electromagnetic pump via a pipe.

[0018] The third ball valve is connected to the liquid outlet of the second connector and is used to control whether the liquid outlet of the second connector is connected to or not connected to the outside.

[0019] In one possible implementation, the flow meter calibration system further includes a first pressure sensor and a second pressure sensor;

[0020] The first pressure sensor is located at a first position in the liquid storage tank and is connected to the inner wall of the liquid storage tank. The distance from the first position to the bottom of the liquid storage tank is a first value. The first pressure sensor is used to detect the first pressure value at the first position.

[0021] The second pressure sensor is located at a second position in the liquid storage tank and is connected to the inner wall of the liquid storage tank. The distance from the second position to the bottom of the liquid storage tank is a second value, which is greater than the first value. The second pressure sensor is used to detect the second pressure value at the second position.

[0022] In one possible implementation, the first ball valve is an electrically controlled ball valve, and the first ball valve is electrically connected to the control unit;

[0023] The control unit is electrically connected to the first pressure sensor and is used to acquire the first pressure value, compare the first pressure value with the first preset pressure value, and control the first ball valve to be in the open state when the first pressure value is greater than or equal to the first preset pressure value. When the first ball valve is in the open state, the liquid outlet of the storage tank and the liquid inlet of the electromagnetic pump are connected.

[0024] In one possible implementation, the flow meter calibration system further includes a liquid replenishment indicator light, which is electrically connected to the control unit;

[0025] The control unit is electrically connected to the second pressure sensor and is used to acquire the second pressure value, compare the second pressure value with the second preset pressure value, and control the liquid replenishment indicator light to be turned on when the second pressure value is less than or equal to the second preset pressure value.

[0026] In one possible implementation, the liquid storage tank includes a first liquid storage chamber and a second liquid storage chamber;

[0027] The first liquid storage chamber is connected to the liquid outlet of the liquid storage tank;

[0028] The second liquid storage chamber is connected to the first liquid storage chamber and is also connected to the liquid inlet of the liquid storage tank.

[0029] In one possible implementation, the outlet of the liquid storage tank is located on the side of the mounting platform away from the liquid storage tank and is connected to the first liquid storage cavity;

[0030] The inlet of the liquid storage tank is located on the side of the mounting platform close to the liquid storage tank and is connected to the second liquid storage chamber. The distance from the inlet of the liquid storage tank to the bottom of the liquid storage tank is a third value, which is greater than the second value.

[0031] In one possible implementation, the flow meter calibration system further includes a first fixed rod and a second fixed rod;

[0032] The two ends of the first fixing rod are respectively connected to the mounting platform and the liquid inlet of the electromagnetic pump;

[0033] The two ends of the second fixing rod are respectively connected to the mounting platform and the liquid outlet of the electromagnetic pump.

[0034] In one possible implementation, the liquid storage tank has a cylindrical structure.

[0035] In one possible implementation, the inner wall of the pipe has a rust-proof layer.

[0036] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0037] This application provides a flowmeter calibration system. In this system, an electromagnetic pump, a standard flowmeter, and the flowmeter to be tested are sequentially installed in the circuit between the outlet and inlet of a liquid storage tank. A control unit is electrically connected to the electromagnetic pump, the standard flowmeter, and the flowmeter to be tested. The control unit controls the electromagnetic pump to operate at different speeds and, under preset conditions, determines whether the accuracy of the flowmeter to be tested meets or does not meet the standard. This allows the flowmeter calibration system to be installed in the workshop, eliminating the need for outsourcing the calibration and thus shortening the calibration time.

[0038] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the structure of a flowmeter calibration system shown in an embodiment of this application;

[0041] Figure 2 This is a schematic diagram of the structure of a flowmeter calibration system shown in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the structure of a flowmeter calibration system shown in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the structure of a drainage component shown in an embodiment of this application.

[0044] Legend

[0045] 1. Mounting platform;

[0046] 101. Support plate; 102. Leg; 103. Reinforcing rib;

[0047] 2. Liquid storage tank;

[0048] 21. First liquid storage chamber; 22. Second liquid storage chamber;

[0049] 3. Electromagnetic pump;

[0050] 4. Standard flow meter;

[0051] 5. The flow meter to be tested;

[0052] 6. First ball valve;

[0053] 7. Second ball valve;

[0054] 8. Control unit;

[0055] 9. Drainage assembly;

[0056] 91. Tee connector; 92. Third ball valve;

[0057] 91a, Liquid inlet of connector; 91b, Liquid outlet of first connector; 91c, Liquid outlet of second connector;

[0058] 10. First pressure sensor;

[0059] 11. Second pressure sensor;

[0060] 12. Infusion indicator light;

[0061] 13. First fixing rod;

[0062] 14. Second fixing rod. Detailed Implementation

[0063] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0064] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” “third,” and similar terms used in this patent disclosure and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. The terms “connected” or “linked” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms “upper,” “lower,” “left,” “right,” etc., are used only to indicate relative positional relationships, and these relative positional relationships may change accordingly when the absolute position of the described objects changes.

[0065] Flow meters are frequently used in engine and transmission development testing. Accurate measurement of the flow meters is crucial to ensure data accuracy. Before conducting engine and transmission development tests, the readings of the flow meters to be used must be accurately measured to ensure that all flow meters used in the development tests meet the reading verification standards, thus guaranteeing accurate test data.

[0066] Figure 1 This application provides a flow meter accuracy measurement system, such as... Figure 1 As shown, the flow meter calibration system includes a mounting platform 1, a liquid storage tank 2, an electromagnetic pump 3, a standard flow meter 4, a flow meter to be measured 5, a first ball valve 6, a second ball valve 7, and a control unit 8.

[0067] The storage tank 2 is located on and connected to the mounting platform 1. The inlet of the electromagnetic pump 3 is connected to the outlet of the storage tank 2 via a pipe. The inlet of the standard flow meter 4 is connected to the outlet of the electromagnetic pump 3 via a pipe. The inlet of the flow meter to be tested 5 is connected to the outlet of the standard flow meter 4 via a pipe, and the outlet of the flow meter to be tested 5 is connected to the inlet of the storage tank 2 via a pipe. The inlet and outlet of the flow meter to be tested 5 are detachably connected to the pipe. The two ends of the first ball valve 6 are connected to the outlet of the storage tank 2 and the inlet of the electromagnetic pump 3 via pipes, respectively. The two ends of the second ball valve 7 are connected to the outlet of the flow meter to be tested 5 and the inlet of the storage tank 2 via pipes, respectively. The control unit 8 is electrically connected to the electromagnetic pump 3, the standard flow meter 4, and the flow meter under test 5, respectively. The control unit 8 is used to: control the electromagnetic pump 3 to operate at different speeds, and obtain the standard flow value detected by the standard flow meter 4 and the flow value under test detected by the flow meter 5 at each speed. Based on the standard flow value detected by the standard flow meter 4 and the flow value under test detected by the flow meter 5 at each speed, the flow deviation value at each speed is determined.

[0068] During implementation, if the flow deviation at each rotational speed is less than or equal to the preset allowable error value, then the flow meter 5 under test is deemed to have accurate readings and its detection accuracy meets the standard, and the flow meter 5 can be used for flow testing. If the flow deviation at any rotational speed exceeds the preset allowable error value, then the flow meter 5 under test is deemed to have inaccurate readings and its detection accuracy does not meet the standard, and the flow meter 5 under test needs to be calibrated.

[0069] The following is a description of each component in the flowmeter calibration system:

[0070] 1. Installation platform 1 and storage tank 2

[0071] Mounting Platform 1

[0072] Mounting platform 1 is a component in the flow meter calibration system used to house the liquid storage tank 2 and the control unit 8.

[0073] like Figure 1 As shown, the mounting platform 1 is set on the ground, and the upper surface of the mounting platform 1 is used to place the liquid storage tank 2 and the control unit 8.

[0074] like Figure 2 As shown, the mounting platform 1 includes a support plate 101 and multiple legs 102.

[0075] The support plate 101 has a rectangular plate structure, and multiple legs 102 are located on the lower surface of the support plate 101 and connected to the support plate 101.

[0076] The support plate 101 may be provided with a through hole for placing the liquid outlet of the storage tank 2.

[0077] Optionally, the upper surface of the support plate 101 may have a positioning groove, the shape of which matches the bottom shape of the liquid storage tank 2, to limit the liquid storage tank 2 and prevent the liquid storage tank 2 from sliding on the upper surface of the support plate 101.

[0078] The support plate 101 and the multiple legs 102 can be integrally formed components or separately processed components. When the support plate 101 and the multiple legs 102 are processed separately, the connection between the support plate 101 and the multiple legs 102 can be welding.

[0079] Optionally, the mounting platform 1 may also include reinforcing ribs 103.

[0080] like Figure 2 As shown, the reinforcing rib 103 has a triangular prism structure, and the wall surfaces corresponding to the two direct sides of the triangular prism structure are connected to the support plate 101 and the leg 102, respectively.

[0081] This can improve the overall strength of mounting platform 1.

[0082] Storage tank 2

[0083] The liquid storage tank 2 is a component in the flow meter calibration system used to contain the test liquid.

[0084] like Figure 2 As shown, the liquid storage tank 2 is located on the upper surface of the support plate 101 of the mounting platform 1 and is connected to the support plate 101.

[0085] The storage tank 2 may have a cylindrical structure with an internal cylindrical cavity for containing the test liquid.

[0086] like Figure 1As shown, the liquid storage tank 2 has an inlet and an outlet. The outlet of the liquid storage tank 2 is located at the bottom of the cylindrical structure and is connected to the cavity of the liquid storage tank 2. The inlet of the liquid storage tank 2 is located on the side wall of the cylindrical structure and is connected to the cavity of the liquid storage tank 2. The height of the inlet of the liquid storage tank 2 is greater than the height of the outlet of the liquid storage tank 2.

[0087] In practice, the test solution can be recycled. The test solution flows out from the outlet of the storage tank 2 and is used to test whether the flow meter under test meets the standard. After the test is completed, it flows into the cavity through the inlet of the storage tank 2 after passing through the external circulation pipeline, thus realizing recycling.

[0088] This can save on the consumption of test solution and reduce costs.

[0089] For example, the test solution can be purified water.

[0090] Optionally, the liquid storage tank 2 may include a first liquid storage chamber 21 and a second liquid storage chamber 22, which are connected to each other.

[0091] like Figure 3 As shown, the internal cavity of the liquid storage tank 2 has a liquid distribution plate, which is connected to the upper surface of the cavity and has a gap between it and the lower surface of the cavity. The first liquid storage cavity 21 and the second liquid storage cavity 22 are connected through the gap between the liquid distribution plate and the lower surface of the cavity.

[0092] In one example, the outlet of the liquid storage tank 2 is located at the bottom of the first liquid storage chamber 21 and is connected to the first liquid storage chamber 21. The inlet of the liquid storage tank 2 is located on the side wall of the second liquid storage chamber 22 and is connected to the second liquid storage chamber 22. The height of the inlet of the liquid storage tank 2 is greater than the height of the outlet of the liquid storage tank 2.

[0093] In practice, the test liquid flows back to the storage tank 2 through the inlet of the external circulation pipeline. When the liquid level in the storage tank 2 is lower than the height of the inlet, bubbles will be generated when the returning test liquid comes into contact with the liquid surface. If these bubbles flow directly from the outlet of the storage tank 2 to the standard flow meter 4, it may affect the testing accuracy of the flow meter under test. However, by setting up a separator plate, the bubbles generated when the returning test liquid comes into contact with the liquid surface can be retained in the second storage chamber 22 and not enter the first storage chamber 21, thereby preventing the bubbles from flowing from the outlet of the storage tank 2 to the standard flow meter 4, and thus improving the testing accuracy.

[0094] Optionally, the inner wall of the storage tank 2 may have a rust-proof layer, such as iron oxide phenolic rust-proof coating, etc. The embodiments of this application do not limit the type of rust-proof layer.

[0095] II. Electromagnetic Pump 3

[0096] The electromagnetic pump 3 is a component in the flowmeter calibration system used to provide backflow force for the test liquid.

[0097] like Figure 1 As shown, the inlet of the electromagnetic pump 3 is connected to the outlet of the storage tank 2 through a pipe, and the outlet of the electromagnetic pump 3 is connected to the inlet of the standard flow meter 4 and the inlet of the storage tank 2.

[0098] In practice, when the electromagnetic pump 3 is in operation, the rotating impeller exerts a force on the test liquid, causing the test liquid to flow from the outlet of the storage tank 2 to the inlet. The higher the impeller speed of the electromagnetic pump 3, the greater the flow rate from the outlet of the storage tank 2 to the inlet; the lower the impeller speed, the smaller the flow rate. By controlling the impeller speed of the electromagnetic pump 3, the flow rate of the test liquid passing through the standard flow meter 4 and the flow meter under test 5 can be controlled.

[0099] III. Standard Flow Meter 4

[0100] The standard flow meter 4 is a component in the flow meter calibration system used to determine whether the reading of the flow meter 5 under test is accurate.

[0101] like Figure 1 As shown, the inlet of the standard flow meter 4 is connected to the outlet of the electromagnetic pump 3 through a pipe, the outlet of the standard flow meter 4 is connected to the inlet of the flow meter to be tested 5 through a pipe, and is connected to the inlet of the storage tank 2.

[0102] In practice, the standard flow meter 4 can be a flow meter that has been calibrated by a metrology institute, and its detection accuracy meets the standard.

[0103] IV. Flowmeter to be tested 5

[0104] The flow meter under test 5 is a component in the flow meter accuracy measurement system that needs to have its accuracy determined.

[0105] like Figure 1 As shown, the inlet of the flow meter 5 to be tested is connected to the outlet of the standard flow meter 4 through a pipe, and the outlet of the flow meter 5 to be tested is connected to the inlet of the storage tank 2.

[0106] In practice, the test liquid flowing out of the outlet of the storage tank 2 passes through the standard flow meter 4 and the flow meter to be tested 5, and under the drive of the electromagnetic pump 3, it flows out from the oil outlet of the flow meter to be tested 5 and then flows back into the storage tank 2 through the inlet of the storage tank 2.

[0107] For example, both the standard flow meter 4 and the flow meter to be measured 5 can be mass flow meters.

[0108] In practice, for different models of flow meters to be tested, only adapters need to be added to both ends of the flow meter to be tested to quickly install the flow meter to be tested into the flow meter measurement system.

[0109] This can improve the versatility of the flow meter accuracy system.

[0110] V. First ball valve 6 and second ball valve 7

[0111] The first ball valve 6 and the second ball valve 7 are components in the flowmeter calibration system used to prevent the flow of the test liquid.

[0112] First ball valve 6

[0113] like Figure 1 As shown, the two ends of the first ball valve 6 are connected to the outlet of the storage tank 2 and the inlet of the electromagnetic pump 3 through pipes, respectively.

[0114] Optionally, the first ball valve 6 can be an electrically controlled ball valve and is electrically connected to the control unit 8.

[0115] In one example, the control unit 8 is used to connect the outlet of the storage tank 2 and the inlet of the electromagnetic pump 3 by controlling the opening of the first ball valve 6; and to disconnect the outlet of the storage tank 2 and the inlet of the electromagnetic pump 3 by controlling the closing of the first ball valve 6.

[0116] In practice, the first ball valve 6 is an electrically controlled ball valve and is installed between the liquid storage tank 2 and the electromagnetic pump 3. That is, the inlet of the first ball valve 6 is connected to the outlet of the liquid storage tank 2, and the outlet of the first ball valve 6 is connected to the inlet of the electromagnetic pump 3.

[0117] In this way, technicians can control the first ball valve 6 to be in an open or closed state by operating the control unit 8, thereby controlling whether the liquid outlet of the storage tank 2 and the liquid inlet of the electromagnetic pump 3 are connected.

[0118] Second ball valve 7

[0119] like Figure 1 As shown, the two ends of the second ball valve 7 are connected to the inlet of the liquid storage tank 2 and the outlet of the flow meter 5 to be measured through pipes.

[0120] Optionally, the second ball valve 7 can be an electrically controlled ball valve and is electrically connected to the control unit 8.

[0121] In one example, the control unit 8 is used to connect the inlet of the storage tank 2 and the outlet of the flow meter 5 by controlling the opening of the second ball valve 7; and to disconnect the inlet of the storage tank 2 and the outlet of the flow meter 5 by controlling the closing of the second ball valve 7.

[0122] In practice, the second ball valve 7 is an electrically controlled ball valve and is installed between the liquid storage tank 2 and the flow meter 5 to be measured. That is, the outlet of the second ball valve 7 is connected to the inlet of the liquid storage tank 2, and the inlet of the second ball valve 7 is connected to the outlet of the flow meter 5 to be measured.

[0123] In this way, technicians can control the second ball valve 7 to be in an open or closed state by operating the control unit 8, thereby controlling whether the test liquid flows back into the storage tank 2.

[0124] VI. Control Unit 8

[0125] The control unit 8 is a component in the flow meter calibration system used to determine whether the detection accuracy of the flow meter 5 under test meets the standard.

[0126] like Figure 1 As shown, the control unit 8 is located above the mounting platform 1 and is fixedly connected to the mounting platform 1.

[0127] The control unit 8 is electrically connected to the electromagnetic pump 3, the standard flow meter 4, and the flow meter to be measured 5, respectively.

[0128] For example, the control unit 8 can be a PLC (Planar Lightwave Circuit, Programmable Logic Controller), and its model can be Siemens PLC1500.

[0129] In practice, the control unit 8 can be used to determine whether the detection accuracy of the flow meter 5 under test meets the standard. The specific process is as follows:

[0130] Step 1: Control unit 8 controls electromagnetic pump 3 to run at different speeds and obtains the standard flow rate value detected by standard flow meter 4 and the flow rate value to be measured detected by flow meter 5 at each speed.

[0131] Optionally, the multiple speeds can be multiple speeds that are evenly distributed within the rated speed of the electromagnetic pump 3.

[0132] For example, the control unit 8 can control the electromagnetic pump 3 to operate at a first speed n1, which can be 20% of the rated speed of the electromagnetic pump 3. At the first speed n1, the first standard flow value corresponding to the detected standard flow value 4 and the first flow value to be measured detected by the flow meter 5 are obtained.

[0133] Next, the control unit 8 can control the electromagnetic pump 3 to run at a second speed n2, which can be 40% of the rated speed of the electromagnetic pump 3. At the second speed n2, the second standard flow value corresponding to the detected standard flow value 4 and the second flow value to be measured detected by the flow meter 5 are obtained.

[0134] Using the same method as the steps described above, the control unit 8 can operate at the third speed n3, the fourth speed n4, and the fifth speed n5 respectively, and obtain the third standard flow value and the third flow value to be measured corresponding to the third speed n3, the fourth standard flow value and the fourth flow value to be measured corresponding to the fourth speed n4, and the fifth standard flow value and the fifth flow value to be measured corresponding to the fifth speed n5.

[0135] Among them, the third speed n3, the fourth speed n4 and the fifth speed n5 can be 60%, 80% and 100% of the rated speed of electromagnetic pump 3, respectively.

[0136] Then, the control unit 8 can store the first standard flow value to the fifth standard flow value and the first flow value to be measured to the fifth flow value to be measured.

[0137] Optionally, multiple speeds can be set by technicians according to actual needs.

[0138] Step 2: Based on the standard flow rate value detected by the standard flow meter 4 and the flow rate value to be measured detected by the flow meter to be measured 5 at each speed, determine the flow rate deviation value at each speed.

[0139] Optionally, the flow deviation value can be the difference between the flow rate to be measured and the standard flow rate. Correspondingly, the preset error allowable value can be a specific flow rate value, such as 1.0 kg / s, and the preset error allowable value can be set by technicians according to actual needs.

[0140] In implementation, after storing the first to fifth standard flow rates and the first to fifth measured flow rates, the control unit 8 can perform difference calculations on the first standard flow rate and the first measured flow rate, the second standard flow rate and the second measured flow rate, the third standard flow rate and the third measured flow rate, the fourth standard flow rate and the fourth measured flow rate, and the fifth standard flow rate and the fifth measured flow rate, respectively. The absolute value of the difference calculation result is then determined as the flow deviation value at the corresponding rotational speed. This flow deviation value is then compared with a preset error allowable value. If the flow deviation value is greater than the preset error allowable value, the detection accuracy of the flow meter at the corresponding rotational speed does not meet the standard.

[0141] Optionally, the flow deviation value can be the ratio of the measured flow value to the standard flow value and the difference between the reference value and the reference value. Correspondingly, the preset error allowable value can be an error percentage value, such as 0.5%.

[0142] The baseline value can be 100%.

[0143] In implementation, after storing the first to fifth standard flow values ​​and the first to fifth measured flow values, the control unit 8 can perform quotient calculations on the first standard flow value and the first measured flow value, the second standard flow value and the second measured flow value, the third standard flow value and the third measured flow value, the fourth standard flow value and the fourth measured flow value, and the fifth standard flow value and the fifth measured flow value to obtain the ratio of the measured flow value to the standard flow value. Then, it determines the difference between the ratio of the measured flow value to the standard flow value and the reference value, records the difference as the difference result, and compares the magnitude of the difference result with the preset error allowable value. If the difference result is greater than the preset error allowable value, the detection accuracy of the flow meter at the speed corresponding to the flow deviation value does not meet the standard.

[0144] Step 3: If the flow deviation value at each speed is less than or equal to the preset error allowable value, then the accuracy of the flow meter under test 5 is determined to meet the standard. If the flow deviation value at any speed is greater than the preset error allowable value, then the accuracy of the flow meter under test 5 is determined to not meet the standard.

[0145] The following section introduces some optional structural features of the flowmeter accuracy system.

[0146] Structural Features 1. The flow meter accuracy system may also include a drain assembly 9, which includes a three-way connector 91 and a third ball valve 92.

[0147] like Figure 4 As shown, the three-way connector 91 has a connector inlet 91a, a first connector outlet 91b, and a second connector outlet 91c.

[0148] The inlet 91a of the connector is connected to the outlet of the storage tank 2 via a pipe. The outlet 91b of the first connector is connected to the inlet of the electromagnetic pump 3 via a pipe. The outlet 91c of the second connector is connected to the inlet of the third ball valve 92 via a pipe.

[0149] Optionally, the axis of the inlet 91a of the connector can coincide with the axis of the outlet of the storage tank 2 and the axis of the outlet 91c of the second connector, and the axis of the outlet 91b of the first connector can be perpendicular to the axis of the inlet 91a of the connector.

[0150] In one example, the outlet of the storage tank 2 is connected to an external pipe, which is placed vertically and has its two ends connected to the outlet of the storage tank 2 and the inlet of the connector 91a, respectively.

[0151] In practice, the inlet of the third ball valve 92 is connected to the outlet 91c of the second connector through a pipeline. When the third ball valve 92 is in the open state, the outlet of the storage tank 2 is connected to the outside. Since the axis of the inlet 91a of the connector can coincide with the axis of the outlet of the storage tank 2 and the outlet 91c of the second connector.

[0152] In this way, the test liquid in the storage tank 2 will flow directly out of the flow meter calibration system through the three-way connector 91 and the third ball valve 92 in sequence, which can improve the drainage efficiency of the flow meter calibration system.

[0153] Structural feature 2: The flow meter accuracy system may also include a first pressure sensor 10 and a second pressure sensor 11.

[0154] like Figure 1 As shown, the first pressure sensor 10 is located at a first position in the liquid storage tank 2 and is connected to the inner wall of the liquid storage tank 2. The distance from the first position to the bottom of the liquid storage tank 2 is a first value. The first pressure sensor 10 is used to detect the first pressure value at the first position. The second pressure sensor 11 is located at a second position in the liquid storage tank 2 and is connected to the inner wall of the liquid storage tank 2. The distance from the second position to the bottom of the liquid storage tank 2 is a second value, which is greater than the first value. The second pressure sensor 11 is used to detect the second pressure value at the second position.

[0155] The first value can be one-third of the height of the storage tank 2, and the second value can be one-half of the height of the storage tank 2.

[0156] In practice, the first pressure sensor 10 and the second pressure sensor 11 can be used to detect the liquid level in the storage tank 2. When the liquid level exceeds the first pressure sensor 10 or the second pressure sensor 11, the pressure value detected by the first pressure sensor 10 or the second pressure sensor 11 is greater than a preset pressure threshold, and thus, it can be determined that the liquid level has exceeded the first pressure sensor 10 or the second pressure sensor 11.

[0157] In one example, the first ball valve 6 is an electrically controlled ball valve, and the first ball valve 6 is electrically connected to the control unit 8. The control unit 8 is electrically connected to the first pressure sensor 10, and is used to acquire the first pressure value detected by the first pressure sensor 10, compare the first pressure value with the first preset pressure value, and when the first pressure value is greater than or equal to the first preset pressure value, control the first ball valve 6 to be in the open state. When the first ball valve 6 is in the open state, the outlet of the liquid storage tank 2 and the inlet of the electromagnetic pump 3 are connected.

[0158] The first preset pressure value can be set by technicians according to actual needs.

[0159] In practice, when the first pressure value is greater than or equal to the first preset pressure value, according to the pressure formula, the liquid level in the storage tank 2 is higher than the preset height of the first pressure sensor 10 (the preset height is positively correlated with the magnitude of the first preset pressure value). At this time, the amount of test liquid in the storage tank 2 is sufficient, so that the test liquid will not be interrupted after the first ball valve 6 is opened.

[0160] In one example, such as Figure 2 As shown, the flow meter calibration system also includes a liquid replenishment indicator light 12, which is electrically connected to the control unit 8. The control unit 8 is electrically connected to the second pressure sensor 11 and is used to acquire a second pressure value, compare the second pressure value with a second preset pressure value, and control the liquid replenishment indicator light 12 to be turned on when the second pressure value is less than or equal to the second preset pressure value.

[0161] Thus, when the volume of test liquid in the flow meter measurement system is low, that is, when the liquid level in the storage tank 2 is level with or lower than the second pressure sensor 11, the control liquid replenishment indicator 12 is turned on to remind the technician to replenish the liquid.

[0162] Thirdly, the flow meter accuracy system may also include a first fixed rod 13 and a second fixed rod 14.

[0163] like Figure 3 As shown, the two ends of the first fixing rod 13 are connected to the mounting platform 1 and the liquid inlet of the electromagnetic pump 3, respectively. The two ends of the second fixing rod 14 are connected to the mounting platform 1 and the liquid outlet of the electromagnetic pump 3, respectively.

[0164] For example, the connection between the first fixing rod 13, the second fixing rod 14 and the mounting platform 1 and the electromagnetic pump 3 can be welding.

[0165] This allows the electromagnetic pump 3 to remain stable during operation.

[0166] The above optional structural features can be used individually or in combination.

[0167] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0168] This application provides a flowmeter calibration system. In this system, an electromagnetic pump 3, a standard flowmeter 4, and a flowmeter 5 to be tested are sequentially installed in the circuit between the outlet and inlet of a liquid storage tank 2. A control unit 8 is electrically connected to the electromagnetic pump 3, the standard flowmeter 4, and the flowmeter 5 to be tested. The control unit 8 controls the electromagnetic pump 3 to operate at different speeds and, under preset conditions, determines whether the accuracy of the flowmeter 5 meets or does not meet the standard. This allows the flowmeter calibration system to be installed in the workshop, eliminating the need for outsourcing the calibration and thus shortening the calibration time.

[0169] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A flow meter calibration system, characterized by, Includes mounting platform (1), liquid storage tank (2), electromagnetic pump (3), standard flow meter (4), flow meter to be measured (5), first ball valve (6), second ball valve (7), control unit (8), first pressure sensor (10), second pressure sensor (11) and liquid replenishment indicator (12); The inlet of the electromagnetic pump (3) is connected to the outlet of the storage tank (2) through a pipe. The inlet of the standard flow meter (4) is connected to the outlet of the electromagnetic pump (3) through a pipe. The inlet of the flow meter to be tested (5) is connected to the outlet of the standard flow meter (4) through a pipe, the outlet of the flow meter to be tested (5) is connected to the inlet of the storage tank (2) through a pipe, the inlet of the flow meter to be tested (5) is detachably connected to the pipe, and the outlet of the flow meter to be tested (5) is detachably connected to the pipe. The two ends of the first ball valve (6) are connected to the outlet of the storage tank (2) and the inlet of the electromagnetic pump (3) through pipes, respectively. The two ends of the second ball valve (7) are connected to the outlet of the flow meter to be measured (5) and the inlet of the storage tank (2) through pipes, respectively. The first pressure sensor (10) is located at a first position in the liquid storage tank (2) and is connected to the inner wall of the liquid storage tank (2). The distance from the first position to the bottom of the liquid storage tank (2) is a first value. The first pressure sensor (10) is used to detect the first pressure value at the first position. The second pressure sensor (11) is located at a second position in the liquid storage tank (2) and is connected to the inner wall of the liquid storage tank (2). The distance from the second position to the bottom of the tank is a second value. The second pressure sensor (11) is used to detect the second pressure value at the second position. The distance from the liquid inlet of the liquid storage tank (2) to the bottom of the tank is a third value. The third value is greater than the second value and greater than the first value. The control unit (8) is electrically connected to the electromagnetic pump (3), the standard flow meter (4), the flow meter to be tested (5), the first ball valve (6), the first pressure sensor (10), the second pressure sensor (11), and the liquid replenishment indicator (12), respectively. The control unit (8) is used to: control the electromagnetic pump (3) to run at different speeds, and obtain the standard flow value detected by the standard flow meter (4) and the flow value to be tested detected by the flow meter to be tested (5) at each speed. Based on the standard flow rate value detected by the standard flow meter (4) at each rotation speed and the flow rate value to be measured detected by the flow meter to be measured (5), the flow deviation value at each rotation speed is determined; If the flow deviation value at each rotation speed is less than or equal to the preset error allowable value, then the accuracy of the flow meter under test (5) is determined to meet the standard; otherwise, the accuracy of the flow meter under test (5) is determined to not meet the standard. Obtain the first pressure value, compare the first pressure value with the first preset pressure value, and when the first pressure value is greater than or equal to the first preset pressure value, control the first ball valve (6) to be in the open state; The second pressure value is obtained, and the second pressure value is compared with the second preset pressure value. When the second pressure value is less than or equal to the second preset pressure value, the liquid replenishment indicator (12) is controlled to be turned on.

2. The flow meter calibration system of claim 1, wherein, The flow meter calibration system also includes a drain assembly (9), which includes a three-way connector (91) and a third ball valve (92). The three-way connector (91) has a connector inlet (91a), a first connector outlet (91b), and a second connector outlet (91c). The connector inlet (91a) is connected to the outlet of the storage tank (2) through a pipe, and the first connector outlet (91b) is connected to the inlet of the electromagnetic pump (3) through a pipe. The third ball valve (92) is connected to the liquid outlet (91c) of the second connector and is used to control whether the liquid outlet (91c) of the second connector is connected to or not connected to the outside.

3. The flow meter calibration system of claim 1, wherein, The liquid storage tank (2) includes a first liquid storage chamber (21) and a second liquid storage chamber (22); The first liquid storage chamber (21) is connected to the liquid outlet of the liquid storage tank (2); The second liquid storage chamber (22) is connected to the first liquid storage chamber (21) and is also connected to the liquid inlet of the liquid storage tank (2).

4. The flowmeter calibration system according to claim 1, characterized in that, The flow meter calibration system also includes a first fixed rod (13) and a second fixed rod (14). The two ends of the first fixing rod (13) are respectively connected to the mounting platform (1) and the liquid inlet of the electromagnetic pump (3); The two ends of the second fixing rod (14) are respectively connected to the mounting platform (1) and the liquid outlet of the electromagnetic pump (3).

5. The flowmeter calibration system according to claim 1, characterized in that, The liquid storage tank (2) has a cylindrical structure.

6. The flowmeter calibration system according to claim 1, characterized in that, The inner wall of the pipe has a rust-proof layer.

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