Standard meter method liquid flow standard device

Abstract

The utility model relates to the technical field of liquid flow standard devices, in particular to a standard meter method liquid flow standard device which comprises a first rack and a second rack, and one side, far away from a liquid tank, of a liquid inlet pipeline is respectively connected with a test pipeline and a detected pipeline through a three-way valve. A first switch valve and a first electromagnetic flowmeter are connected to the test pipeline, a second switch valve and a second electromagnetic flowmeter are connected to the detected pipeline, a water pump is connected to the side, away from the liquid inlet pipeline, of the detected pipeline, and a liquid outlet pipe is fixedly connected to the middle of the side, located on the water pump, of the detected pipeline; the liquid outlet pipe and the recovery pipe are both connected with a surge tank, a control device is fixedly installed on the rear side of the top of the first rack, the electromagnetic flow meters in the device can be all connected or partially connected, and a wide flow range can be obtained by selecting different combinations of the electromagnetic flow meters; and the working capability of the standard meter method water flow standard device is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid flow standard devices, in particular to a standard meter method liquid flow standard device. Background Art

[0002] The standard meter method liquid flow standard device is a measuring instrument used in the field of physics, mainly composed of a liquid source, a test pipeline, a standard liquid flow meter, a timer and a control device. The standard meter method liquid flow standard device has the same requirements for pipeline design, control system and voltage stabilization measures as the static volume method liquid flow standard device. It can give the standard flow according to the calibration flow point or the calibration flow range. A single unit can be connected in series with the test pipeline or multiple units can be connected in parallel and then connected in series with the test pipeline. The standard liquid flow meter can be various liquid flow meters.

[0003] The standard meter method liquid flow standard devices currently on the market cannot be combined in different ways according to the measurement requirements, so that a wider flow range cannot be obtained, thereby reducing the working capacity of the standard meter method water flow standard device.

[0004] Therefore, it is necessary to design a standard meter method liquid flow standard device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a standard meter method liquid flow standard device to solve the problems raised in the above background technology.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A standard meter method liquid flow standard device comprises a first frame and a second frame, a liquid tank is fixedly installed at the inner bottom end of the first frame, a liquid inlet pipeline is also connected to one side of the liquid tank, a test pipeline and a tested pipeline are respectively connected to the side of the liquid inlet pipeline away from the liquid tank through a three-way valve, a first switch valve and a first electromagnetic flowmeter are connected to the test pipeline, a second switch valve and a second electromagnetic flowmeter are connected to the tested pipeline, and each of the tested pipelines is also fixedly connected through a connecting pipeline, and each of the connecting pipelines is also connected to a second electromagnetic flowmeter, a water pump is connected to the side of the tested pipeline away from the liquid inlet pipeline, a liquid outlet pipe is fixedly connected to the tested pipeline at the middle position on one side of the water pump, a recovery pipe is connected to the test pipeline above the second frame, the liquid outlet pipe and the recovery pipe are both connected to a pressure-stabilizing tank, and a control device is fixedly installed on the top rear side of the first frame.

[0008] As a preferred solution of the utility model, one side of the liquid inlet pipeline is fixedly connected to the interface on the liquid tank and communicated with the inner cavity of the tank, and the other side is connected to the three-way valve by a thread, and the other two ends of the three-way valve are respectively connected to the main pipes of the test pipeline and the inspected pipeline by threads.

[0009] As a preferred solution of the utility model, the second electromagnetic flowmeter on each of the inspected pipelines is connected in parallel, and then connected in series with the test pipeline after being connected in parallel.

[0010] As a preferred solution of the utility model, the liquid inlet pipeline is also provided with a fifth switch valve for controlling the pipeline.

[0011] As a preferred solution of the utility model, a third switch valve and a pressure relief pipe are provided on the recovery pipe, and a fourth switch valve is also provided on the pressure relief pipe.

[0012] As a preferred solution of the utility model, a timer is provided on the control device, and the first electromagnetic flowmeter and the second electromagnetic flowmeter are both communicatively connected to the control device.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] In the utility model, a standard meter method liquid flow standard device is set up. When using the standard meter method liquid flow standard device, multiple electromagnetic flow meters are connected in parallel and then connected in series with the test pipeline to form a standard meter method water flow standard device in the scheme. When working, the electromagnetic flow meters can be fully connected or partially connected. By selecting different combinations of electromagnetic flow meters, a wider flow range can be obtained, thereby improving the working capacity of the standard meter method water flow standard device. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0016] Figure 2 It is a three-dimensional structural schematic diagram of the pipeline to be inspected in the utility model;

[0017] Figure 3 It is a schematic diagram of the three-dimensional structure of the recovery pipe of the utility model.

[0018] In the figure: 1, first frame; 2, second frame; 3, liquid tank; 4, liquid inlet pipeline; 41, fifth switch valve; 5, three-way valve; 6, test pipeline; 7, inspected pipeline; 8, first switch valve; 9, first electromagnetic flowmeter; 10, second switch valve; 11, second electromagnetic flowmeter; 12, water pump; 121, connecting pipeline; 13, liquid outlet pipe; 14, recovery pipe; 15, pressure regulating tank; 16, control device; 17, third switch valve; 18, pressure relief pipe; 19, fourth switch valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0020] In order to facilitate the understanding of the utility model, the utility model will be described more comprehensively with reference to the relevant drawings below. Several embodiments of the utility model are given. However, the utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the utility model more thorough and comprehensive.

[0021] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] For examples, see Figure 1-3 , the utility model provides a technical solution:

[0024] The standard meter method liquid flow standard device comprises a first frame 1 and a second frame 2. A liquid tank 3 is fixedly installed at the bottom of the first frame 1. A liquid inlet pipeline 4 is also connected to one side of the liquid tank 3. A test pipeline 6 and a test pipeline 7 are respectively connected to the side of the liquid inlet pipeline 4 away from the liquid tank 3 through a three-way valve 5. The test pipeline 6 is connected to a first switch valve 8 and a first electromagnetic flowmeter 9. The test pipeline 7 is connected to a second switch valve 10 and a second electromagnetic flowmeter 11. Each test pipeline 7 They are also fixedly connected via a connecting pipe 121, and each connecting pipe 121 is also connected to a second electromagnetic flowmeter 11. A water pump 12 is connected to the side of the inspected pipeline 7 away from the liquid inlet pipeline 4. A liquid outlet pipe 13 is fixedly connected to the inspected pipeline 7 at a middle position on one side of the water pump 12. A recovery pipe 14 is connected to the test pipeline 6 above the second frame 2. The liquid outlet pipe 13 and the recovery pipe 14 are both connected to a pressure-stabilizing tank 15. A control device 16 is fixedly installed on the top rear side of the first frame 1.

[0025] Specifically, one side of the liquid inlet pipeline 4 is fixedly connected to the interface on the liquid tank 3 and communicated with the inner cavity of the tank, and the other side is connected to the three-way valve 5 by a thread, and the other two ends of the three-way valve 5 are respectively connected to the main pipes of the test pipeline 6 and the inspected pipeline 7 by threads; the second electromagnetic flowmeter 11 on each inspected pipeline 7 is connected in parallel, and then connected in series with the test pipeline 6 after parallel connection; the liquid inlet pipeline 4 is also provided with a fifth switch valve 41 for controlling its pipeline; the recovery pipe 14 is provided with a third switch valve 17 and a pressure relief pipe 18, and the pressure relief pipe 18 is also provided with a fourth switch valve 19. When the fourth switch valve 19 is opened, the pressure relief pipe 18 can be used to relieve pressure to avoid excessive pressure inside the pipeline; the control device 16 is provided with a timer, and the first electromagnetic flowmeter 9, the first electromagnetic flowmeter 9, the second electromagnetic flowmeter 9, the first ... The two electromagnetic flowmeters 11 are both connected to the control device 16 for communication; five second electromagnetic flowmeters 11 are connected in parallel and then connected in series with the test pipeline 6 to form a standard meter method water flow standard device in the scheme; when working, the fifth switch valve 41, the second switch valve 10, the first switch valve 8, the first electromagnetic flowmeter 9 and the second electromagnetic flowmeter 11 can be started to measure the flow rate. All electromagnetic flowmeters can be fully connected or partially connected. By selecting different combinations of electromagnetic flowmeters, a wider flow range can be obtained, which improves the working capacity of the standard meter method water flow standard device. The electromagnetic flowmeter is used to measure the liquid flow rate, and the liquid after the measurement is completed will be recovered to the pressure stabilizing tank 15 for pressure stabilization operation, and can also be collected in the liquid tank 3 for use.

[0026] Among them, the three-way valve 5 , the first switch valve 8 , the second switch valve 10 , the third switch valve 17 and the fourth switch valve 19 are all electrically controlled valves, which can be electrically controlled by the control device 16 .

[0027] Among them, the working principle of the electromagnetic flowmeter is that the induced electromotive force generated by the flow of conductive fluid in a magnetic field is proportional to the flow rate. The electromagnetic flowmeter has no mechanical parts, so it has a wide range, no mechanical inertia, and is sensitive to reaction. When the fluid passes through, it does not produce pressure loss, and will not cause problems such as wear and blockage. Therefore, the electromagnetic flowmeter as a standard meter is a typical device of the standard meter method water flow standard device.

[0028] The working principle of the standard meter water flow standard device is based on the continuity equation of fluid mechanics. With h electromagnetic flow meters as standard devices, water is continuously passed through the electromagnetic flow meter and the test pipeline at a certain flow rate. At this time, the instantaneous volume flow rate given by the standard meter water flow standard device is calculated according to the formula: Where: qv-----instantaneous volume flow, m3 / s; q w -----Flow rate of the wth electromagnetic flowmeter, m3 / s.

[0029] The cumulative volume flow rate given by the standard meter method water flow standard device is calculated according to the formula: QV=qv·t, where: QV-----cumulative volume flow rate, m3; qv-----measurement time of the electromagnetic flowmeter, s.

[0030] The standard meter method water flow standard device is usually used according to the calibration range of the electromagnetic flowmeter, that is, non-fixed point use. The flow-flow correction value curve and function expression should be given for each electromagnetic flowmeter. When testing the flowmeter, first select the electromagnetic flowmeter and combine it according to the test flow point of the measured flowmeter, close the upstream and downstream valves of the electromagnetic flowmeter that does not participate in the test, open the upstream and downstream valves of the selected electromagnetic flowmeter, and let the water circulate in the system consisting of the pressure regulating tank, the selected electromagnetic flowmeter, the measured flowmeter, the pool and the water pump. Then, adjust the flow regulating valve so that the flow reaches the calibration flow point and stabilizes for a period of time. Finally, start measuring and record the output values ​​of the selected electromagnetic flowmeter and the measured flowmeter at the same time. After a certain period of time, stop recording the output values ​​of the selected electromagnetic flowmeter and the measured flowmeter at the same time. Compare the flow values ​​measured by the two to determine the metering performance of the measured flowmeter.

[0031] Select m (m ≥ 10) flow points within the range of the electromagnetic flow meter, calibrate each point once, and you can get the flow correction value Δq j or ΔQ j , according to the instantaneous flow calibration, q should be given j With Δq j The least square fitting curve of the cumulative flow rate should give q j With ΔQ j The least squares fitting curve of j With Δq j When the straight line is fitted, Δq j =a+bqj +v j , where: Δq j -----Flow correction value; q j -----The principle of determining the flow rate at the calibration point and the value of a and b is to make minimum, then Δq=a+b·q

[0032]

[0033]

[0034] Standard deviation of the functional expression of flow rate-flow correction value:

[0035]

[0036] Relative standard uncertainty of the functional expression of flow rate-flow rate correction value:

[0037] Where: u w -----Relative standard uncertainty of the functional expression of flow rate-flow rate correction value, %; q j -----Common flow rate of electromagnetic flowmeter, m 3 / h.

[0038] The relative standard uncertainty of the standard flowmeter of h electromagnetic flowmeters in parallel is calculated according to formula (8-9): Where: q w -----Flow rate corresponding to the wth electromagnetic flowmeter, m 3 / h, when w=1, u 21 =u w .

[0039] The relative standard uncertainty of the flow rate given by the upper level water flow standard device for calibrating the electromagnetic flowmeter is u 22 If the electromagnetic flowmeter is not calibrated with the matching instrument, the relative standard uncertainty of the flow introduced is u 23 If the fluid conditions during the electromagnetic flowmeter calibration are inconsistent with those during use, the relative standard uncertainty of the flow rate caused by this influence is u 24 .

[0040] The relative standard uncertainty of flow caused by the uncertainty of data acquisition, signal processing, data processing and communication is u 25 .

[0041] The working process of the utility model is as follows: when using the quasi-meter method liquid flow standard device, a plurality of electromagnetic flow meters are connected in parallel and then connected in series with the test pipeline to form a standard meter method water flow standard device in the scheme. When working, the electromagnetic flow meters can be fully connected or partially connected. By selecting different combinations of electromagnetic flow meters, a wider flow range can be obtained, thereby improving the working capacity of the standard meter method water flow standard device. The electromagnetic flow meter is used to measure the liquid flow, and the liquid after the measurement is completed will be recovered to the pressure stabilizing tank 15 for pressure stabilization operation, and can also be collected in the liquid tank 3 for use.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A standard meter method liquid flow standard device, comprising a first frame (1) and a second frame (2), characterized in that: A liquid tank (3) is fixedly mounted at the bottom end of the first frame (1); one side of the liquid tank (3) is also connected to a liquid inlet pipeline (4); the side of the liquid inlet pipeline (4) away from the liquid tank (3) is respectively connected to a test pipeline (6) and a test pipeline (7) via a three-way valve (5); the test pipeline (6) is connected to a first switch valve (8) and a first electromagnetic flowmeter (9); the test pipeline (7) is connected to a second switch valve (10) and a second electromagnetic flowmeter (11); and each of the test pipelines (7) is also connected via a connecting pipeline (121). The two connecting pipes (121) are fixedly connected, and each of the connecting pipes (121) is also connected to a second electromagnetic flowmeter (11); the side of the tested pipe (7) away from the liquid inlet pipe (4) is connected to a water pump (12); a liquid outlet pipe (13) is fixedly connected to the tested pipe (7) at a middle position on one side of the water pump (12); a recovery pipe (14) is connected to the test pipe (6) above the second frame (2); the liquid outlet pipe (13) and the recovery pipe (14) are both connected to a pressure stabilizing tank (15); and a control device (16) is fixedly installed on the top rear side of the first frame (1).

2. The standard meter liquid flow standard device according to claim 1, characterized in that: One side of the liquid inlet pipeline (4) is fixedly connected to the interface on the liquid tank (3) and communicated with the inner cavity of the tank, and the other side is connected to the three-way valve (5) through a thread, and the other two ends of the three-way valve (5) are respectively connected to the main pipes of the test pipeline (6) and the inspected pipeline (7) through a thread.

3. The standard meter liquid flow standard device according to claim 1, characterized in that: The second electromagnetic flowmeter (11) on each of the inspected pipelines (7) is connected in parallel and then connected in series with the test pipeline (6).

4. The standard meter liquid flow standard device according to claim 1, characterized in that: The liquid inlet pipeline (4) is also provided with a fifth switch valve (41) for controlling the pipeline.

5. The standard meter liquid flow standard device according to claim 1, characterized in that: The recovery pipe (14) is provided with a third switch valve (17) and a pressure relief pipe (18), and the pressure relief pipe (18) is also provided with a fourth switch valve (19).

6. The standard meter liquid flow standard device according to claim 1, characterized in that: The control device (16) is provided with a timer, and the first electromagnetic flowmeter (9) and the second electromagnetic flowmeter (11) are both communicatively connected to the control device (16).

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