Calibrating device for fluid flowmeter

Abstract

The utility model discloses a liquid flowmeter calibration device which comprises a concentric-square-shaped water pipe, the water pipe is connected with a water tank, a water pump is installed in the water pipe, and the water pump is used for adjusting the flow speed and flow of water flow in the water pipe and conveying the water flow in the water pipe in a circulating flowing mode in the anticlockwise direction. A to-be-calibrated liquid flowmeter and a standard flowmeter are installed on the water pipe in series, the standard flowmeter is an electromagnetic flowmeter, and the to-be-calibrated liquid flowmeter comprises a temperature flow analyzer and a Doppler flow velocity profiler. The flow velocity and the flow rate of water flow in the water pipe can be controlled and adjusted through the water pump, so that the flow velocity and the flow rate stability of the water flow are ensured, a traditional water tower type standard gold container is not needed, the occupied space is small, and the environment is sealed in the whole measurement process; therefore, accuracy and stability of flow velocity and flow measurement data measured by the to-be-calibrated liquid flowmeter and the standard flowmeter are guaranteed, the calibration device is unified and fixed, and the calibration device is suitable for calibration of different liquid flowmeters and convenient to operate.

Description

TECHNICAL FIELD

[0001] The utility model relates to liquid flowmeter calibration technical field, specifically related to a liquid flowmeter calibration device. BACKGROUND

[0002] The calibration method of liquid flowmeter mainly has volume method, mass method. Among them, the volume method is the most common, which is a method of measuring the volume of fluid flowing into a constant volume container within a measurement time to obtain the flow. The mass method is a method of weighing the mass of fluid flowing into a container within a measurement time to obtain the flow. When calibrating, the pump draws the test fluid from the liquid storage container, passes through the calibrated flowmeter, and then enters the liquid container. The weight is weighed at the same time, and the temperature of the fluid is measured to determine the density value of the measured fluid at the temperature. The weight of the measured fluid is divided by the density of the fluid at the measured temperature to obtain the volume of the fluid. Comparing it with the volume value (cumulative pulse number) of the instrument can determine the instrument constant and accuracy of the calibrated flowmeter. The system accuracy of this method can reach 0.1%, and the liquid flowmeter cannot be calibrated. The two traditional detection methods have the problems of non-fixed equipment, high uncertainty and large error in the calibration process. SUMMARY

[0003] The utility model aims at providing a kind of liquid flowmeter calibration device to solve the above-mentioned technical problems.

[0004] To achieve the above object, the technical scheme of the utility model is as follows: a kind of liquid flowmeter calibration device, including the water pipe of back-shaped, water pipe is connected with water tank, water pump is installed in water pipe, water pump is used to adjust the flow velocity and flow of water flow in water pipe and circulates and flows along counterclockwise direction and is transported, water pipe is installed in series with the liquid flowmeter to be calibrated and standard flowmeter, standard flowmeter is electromagnetic flowmeter, the liquid flowmeter to be calibrated includes temperature flow analyzer and doppler flow velocity profiler. Preferably, water pipe includes front transverse pipe and rear transverse pipe which are parallel and transversely arranged, and left vertical pipe and right vertical pipe which are parallel and longitudinally arranged.

[0005] Preferably, temperature flow analyzer includes first temperature flow analyzer and second temperature flow analyzer, first temperature flow analyzer, electromagnetic flowmeter, doppler flow velocity profiler and second temperature flow analyzer are sequentially installed into rear transverse pipe along water flow direction, and the distance between first temperature flow analyzer and electromagnetic flowmeter is equal to the distance between doppler flow velocity profiler and second temperature flow analyzer.

[0006] Preferably, the distance between the probe of first temperature flow analyzer and the probe of second temperature flow analyzer is 100m.

[0007] Preferably, the diameter of the water pipe is 20cm, the length of the front and rear horizontal pipes ranges from 50 to 150m, and the length of the left and right vertical pipes ranges from 1 to 10m.

[0008] Preferably, the water pump is multiple, and the multiple water pumps are arranged in the right vertical pipe and located at the rear of the conveying direction of the water tank.

[0009] Preferably, two water temperature meters are arranged in the upper horizontal pipe between the electromagnetic flow meter and the Doppler flow velocity profiler.

[0010] Preferably, the cross section of the water pipe is circular, and the four corners of the water pipe are rounded.

[0011] Preferably, the flow velocity of the water flow in the water pipe ranges from 1.0m / s to 10.0m / s.

[0012] Preferably, the water pipe is closed and has uniform wall thickness, roughness and diameter.

[0013] The utility model has the following beneficial effects:

[0014] 1. The liquid flow meter calibration device has good flow source stability, adjustable, controllable and stable flow velocity and flow, ensures correct measurement of flow value, adopts closed design, controls water flow pressure through two water pumps, is more convenient and flexible than traditional water tower type pressure, and is unified and fixed, suitable for calibration of different liquid flow meters and convenient to operate.

[0015] 2. When the volume method is used to calibrate the flow meter, the reading of the flow meter is the volume, and the reading of the timer can be ignored, thereby reducing the error of the timer reading and increasing the accuracy.

[0016] 3. The liquid flow meter calibration device is used to calibrate the liquid flow meter, does not need a standard gold container, is sealed during measurement, simulates the pipeline pressure in the actual flow meter use process, has accurate measurement data and is convenient to operate. DRAWINGS

[0017] Figure 1 is a structural schematic diagram of an embodiment of the utility model.

[0018] Drawing reference: 1 water pipe, 11 front horizontal pipe, 12 rear horizontal pipe, 13 left vertical pipe, 14 right vertical pipe, 2 water pump, 3 electromagnetic flow meter, 4 first temperature flow analyzer, 5 second temperature flow analyzer, 6 Doppler flow velocity profiler, 7 water temperature meter. DETAILED DESCRIPTION

[0019] To further illustrate the embodiments, the present application provides drawings. These drawings are part of the disclosure of the present application, which are mainly used to illustrate the embodiments, and can be combined with the related description of the specification to explain the operating principle of the embodiments. With reference to these contents, those skilled in the art should be able to understand other possible implementations and advantages of the present application. The components in the drawings are not drawn to scale, and similar component symbols are usually used to represent similar components.

[0020] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore It cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0021] In the description of the present application, it should be pointed out that, unless otherwise specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; It can be mechanically connected, or it can be electrically connected; It can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0022] Reference Figure 1As shown, as an embodiment of the utility model provides a liquid flowmeter calibration device, including the closed water pipe 1 of back -shaped, water pipe 1 is connected with water tank, water pump 2 is installed in water pipe 1, water pump 2 is used for adjusting the flow rate and flow of water flow in water pipe 1 and along the counterclockwise direction circulation flow delivery of water flow in water pipe 1, water pipe 1 is installed in series with the standard flowmeter of liquid flowmeter to be calibrated, and the standard flowmeter is electromagnetic flowmeter 3, and the liquid flowmeter to be calibrated includes temperature flow analyzer and doppler flow velocity profile instrument 6, by comparing the flow rate and flow value measured by the liquid flowmeter to be calibrated and the standard flowmeter, the error is obtained, and then the temperature flow analyzer and doppler flow velocity profile instrument 6 are calibrated. Since the water flow is circulated and transported in a single direction in the closed back-shaped water pipe 1, and the flow rate and flow of the water flow in the water pipe 1 are controlled and adjusted by the water pump 2, the stability of the flow rate and flow of the water flow is ensured, large fluctuations are avoided, the traditional water tower type standard gold container is not needed, the space occupied is small, and then the flow rate is obtained by dividing the water flow by time, but the flow rate is adjusted, and the whole measurement is in a sealed environment, and the pipe pressure during the simulation of the actual flowmeter use process is simulated, so that the measurement data of the flow rate and flow measured by the liquid flowmeter to be calibrated and the standard flowmeter are accurate and stable, and the calibration device is unified and fixed, suitable for calibration of different liquid flowmeters, and easy to operate.

[0023] In the embodiment, the water pipe 1 includes front and rear parallel and transversely arranged front and rear transverse pipes 11 and 12 and left and right parallel and longitudinally arranged left and right longitudinal pipes 13 and 14, thereby forming a closed back-shaped water pipe 1. This arrangement makes the flow rate and flow of the water flow in each pipe section more balanced and stable, thereby ensuring the accuracy and stability of the measurement data. Of course, in other cases, the water pipe can also be annular.

[0024] In the embodiment, the temperature flow analyzer includes a first temperature flow analyzer 4 and a second temperature flow analyzer 5, the first temperature flow analyzer 4, the electromagnetic flowmeter 3, the doppler flow velocity profile instrument 6 and the second temperature flow analyzer 5 are sequentially installed into the rear transverse pipe 12 along the water flow direction, and the distance between the first temperature flow analyzer 4 and the electromagnetic flowmeter 3 is equal to the distance between the doppler flow velocity profile instrument 6 and the second temperature flow analyzer 5. The multiple flowmeters are uniformly arranged and distributed, thereby reducing the impact on the water flow, reducing the balance and stability of the flow rate and flow of the water flow before and after flowing through the flowmeter, and avoiding large fluctuations.

[0025] In the embodiment, the distance between the probe of the first temperature flow analyzer 4 and the probe of the second temperature flow analyzer 5 is 100 m, the diameter of the water pipe 1 is 20 cm, the length of the front and rear transverse pipes 11 and 12 ranges from 50 to 150 m, and the length of the left and right longitudinal pipes 13 and 14 ranges from 1 to 10 m.

[0026] In the embodiment, the water pump 2 is multiple, the multiple water pumps 2 are arranged in the right vertical pipe 14, and the water pump 2 is located at the rear of the conveying direction of the water tank, so that the intensity and stability of water flow conveying are ensured.

[0027] In the embodiment, two water temperature meters 7 are arranged in the upper horizontal pipe between the electromagnetic flowmeter 3 and the Doppler flow velocity profiler 6, and are used for measuring the water temperature of the water flow.

[0028] In the embodiment, the cross section of the water pipe 1 is circular, and the four corners of the water pipe 1 are rounded, so that the resistance of the four corners of the water pipe 1 is uniform, the flow velocity and flow of the water flow at the straight section and the bending section of the water pipe 1 are balanced and uniform, and the stability of the measurement result is ensured.

[0029] In the embodiment, the adjustment range of the flow velocity of the water flow in the water pipe 1 is 1.0 m / s-10.0 m / s, the commonly used flow velocity is 1 m / s, the accuracy of the Doppler flow velocity profiler 6 and the flowmeter when measuring the water flow with the flow velocity of 1 m / s is ±0.02 m / s, and the accuracy of the water temperature meter 7 is ±0.05 DEG C. In the calibration process, the water pump 2 can ensure that the water flow maintains a constant flow velocity in the '' back '' shaped volume pipe, and the flow of the water flow in the water pipe 1 can be adjusted to be full pipe or non-full pipe state, and the non-full pipe state is mostly used for the calibration of the river flowmeter.

[0030] In the embodiment, the water pipe 1 is a water pipe 1 with uniform wall thickness, roughness and diameter, so that the flow velocity and flow of the water flow at any position of the water pipe 1 are balanced and uniform, and the stability of the measurement result is ensured.

[0031] The calibration steps of the liquid flowmeter calibration device are as follows: the first temperature and flow analyzer 4, the electromagnetic flowmeter 3, the Doppler flow velocity profiler 6 and the second temperature and flow analyzer 5 are sequentially arranged into the rear horizontal pipe 12 along the water flow direction, and the probes (transmitting transducer probe and receiving transducer probe) of the first temperature and flow analyzer 4 and the second temperature and flow analyzer 5 are rigidly fixed and arranged according to the pre-set mounting hole position. The electromagnetic flowmeter 3, the Doppler flow velocity profiler 6, the two water pumps 2 and the two temperature and flow analyzers are powered and are ready to work. The working speed of the water pump 2 and the water flow velocity in the full pipe are set, the indicated flow velocity of the flowmeter and the Doppler flow velocity profiler 6 is observed, and the flow velocity is ensured to be within the error range. At the same time, the two temperature and flow analyzers are started, the calibration time is 10 minutes, and the data display is one temperature and flow value per minute. The data is automatically saved during the calibration process, so that the data can be read and verified after the calibration is completed. The temperature data of the total quantity measuring device and the data of the thermometer are compared, the average temperature value of the total quantity measurement and the average temperature value of the two thermometers are less than 0.05 DEG C. The values of the Doppler flow velocity profiler 6 and the electromagnetic flowmeter 3 are averaged, the flow velocity data of the temperature and flow analyzer and the average value are compared, and the maximum deviation of the data is less than 0.05 m / s.

[0032] In conclusion, the liquid flowmeter calibration device has the following advantages:

[0033] 1, the liquid flowmeter calibration device of the utility model has good flow source stability, and the flow rate and flow of water flow are adjustable, controllable and stable and unified, ensuring correct measurement of flow value.

[0034] 2, when the volumetric method is used to calibrate the flowmeter, the reading of the flowmeter is the volume, and the reading of the timer can be ignored, thereby reducing the error of the timer reading and increasing the accuracy.

[0035] 3, the liquid flowmeter calibration device is used to calibrate the liquid flowmeter, and a standard gold container is not needed, the whole measurement process is in a sealed environment, the pipeline pressure during the actual use of the flowmeter is simulated, the measurement data is accurate, and the operation is convenient.

[0036] Although the utility model is specifically shown and introduced in combination with the preferred embodiments, those skilled in the art should understand that various changes can be made to the utility model in form and details without departing from the spirit and scope of the utility model defined in the appended claims, and all fall within the protection scope of the utility model.

Claims

1. A liquid flow meter calibration device, characterized in that: It includes a U-shaped water pipe connected to a water tank, and a water pump installed inside the pipe. The water pump is used to regulate the flow rate and volume of the water in the pipe and to circulate the water in the pipe in a counterclockwise direction. A flow meter to be calibrated and a standard flow meter are installed in series on the water pipe. The standard flow meter is an electromagnetic flow meter, and the flow meter to be calibrated includes a temperature and flow analyzer and a Doppler velocity profiler.

2. The liquid flow meter calibration device according to claim 1, characterized in that: The water pipes include a front horizontal pipe and a rear horizontal pipe that are parallel to each other and arranged laterally, and a left vertical pipe and a right vertical pipe that are parallel to each other and arranged longitudinally.

3. The liquid flow meter calibration device according to claim 1, characterized in that: The temperature and flow analyzer includes a first temperature and flow analyzer and a second temperature and flow analyzer. The first temperature and flow analyzer, the electromagnetic flow meter, the Doppler velocity profiler, and the second temperature and flow analyzer are installed sequentially in the rear horizontal pipe along the water flow direction, and the distance between the first temperature and flow analyzer and the electromagnetic flow meter is equal to the distance between the Doppler velocity profiler and the second temperature and flow analyzer.

4. The liquid flow meter calibration device according to claim 3, characterized in that: The distance between the probe of the first temperature and current analyzer and the probe of the second temperature and current analyzer is 100m.

5. The liquid flow meter calibration device according to claim 2, characterized in that: The diameter of the water pipe is 20cm, the length of the front and rear horizontal pipes ranges from 50 to 150m, and the length of the left and right longitudinal pipes ranges from 1 to 10m.

6. The liquid flow meter calibration device according to claim 1, characterized in that: There are multiple water pumps, which are installed inside the right longitudinal pipe and located behind the water tank in the direction of water delivery.

7. The liquid flow meter calibration device according to claim 1, characterized in that: Two water thermometers are installed at intervals inside the upper horizontal pipe between the electromagnetic flowmeter and the Doppler velocity profiler.

8. The liquid flow meter calibration device according to claim 1, characterized in that: The water pipe has a circular cross-section and rounded corners.

9. The liquid flow meter calibration device according to claim 1, characterized in that: The flow rate of water in the pipe can be adjusted within the range of 1.0 m / s to 10.0 m / s.

10. The liquid flow meter calibration device according to claim 1, characterized in that: The water pipe is a closed type with uniform wall thickness, roughness, and diameter.

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