CN209727221U - A flow meter calibration device - Google Patents

Abstract

The utility model discloses a flowmeter checking device, which comprises a frame, and the frame is provided with an electric control box, a water storage tank, a water pump, a differential pressure transmitter, and a main pipeline, and the water inlet pipe of the water pump It communicates with the bottom of the water storage tank. The main pipeline is connected with the outlet pipe of the water pump and then divided into multiple test pipelines. Each test pipeline is provided with an inlet valve, a front pressure equalizing valve, a flowmeter to be tested, and a rear The pressure equalizing valve and the front pilot valve connected with the front pressure equalizing valve and the rear pilot valve connected with the rear pressure equalizing valve, all the front pilot valves on multiple test pipelines are connected in parallel and then connected to the differential pressure transmitter The initial pressure inlet, and all the rear pressure introduction valves are connected in parallel to the final pressure inlet of the differential pressure transmitter. The utility model can complete the test of different types of flow meters on multiple sets of test pipelines by adjusting the opening and closing of the inlet valve and the pressure introduction valve, and can directly read the results on the display unit by adjusting the water pump and the flow rate, which is fast and simple , The error is small.

Description

A flow meter calibration device

technical field

The utility model relates to the field of laboratory fluid mechanics test equipment, in particular to a flow meter check device.

Background technique

When the fluid passes through the pipeline system composed of straight pipes, pipe fittings (such as tees and elbows, etc.) and valves, due to the existence of viscous shear stress and eddy current stress, a certain amount of mechanical energy will be lost. The mechanical energy loss caused by the fluid flowing through the straight pipe is called the straight pipe resistance loss. The mechanical energy loss caused by the change of fluid movement direction and velocity when fluid passes through pipe fittings and valves is called local resistance loss.

Most of the existing laboratory equipment uses U-shaped pressure difference gauges and manual measurement of water volume and time to measure fluid resistance. There are problems such as large errors, frequent replacement of test tubes, and cumbersome operations, which hinder students from successfully completing the test process and quickly Understand the purpose of the experiment and hinder students from learning and practicing.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art, and propose a flowmeter checking device, which can complete the fluid resistance test of multiple sets of test tubes by adjusting the opening and closing of the inlet valve and the pressure introduction valve, and can By adjusting the water pump and the flow rate, the result can be read directly on the display unit, which is fast and simple, and has small error.

Technical scheme of the utility model:

A flowmeter checking device, comprising a frame, the frame is provided with an electrical control box, a water storage tank, a water pump, a differential pressure transmitter, and a main pipeline, and the water inlet pipe of the water pump is connected to the bottom of the water storage tank The main pipeline is connected with the outlet pipe of the water pump and then divided into multiple test pipelines. Each test pipeline is provided with an inlet valve, a front pressure equalizing valve, a flow meter to be tested, a rear pressure equalizing valve and a The front pressure introduction valve connected to the front pressure equalization valve and the rear pressure introduction valve connected to the rear pressure equalization valve, the multiple test pipelines converge into the main pipeline and then connected to the outlet valve and then connected to the water storage tank. The above-mentioned main pipeline is equipped with a standard flowmeter. All the front pressure introduction valves on multiple test pipelines are connected in parallel to the initial pressure inlet of the differential pressure transmitter, and all the rear pressure introduction valves are connected in parallel to the inlet of the differential pressure transmitter. The final pressure enters the water port. The electric control box is composed of a calculation control unit and a display unit. The water pump, standard flow meter, and differential pressure transmitter are connected with the calculation control unit.

Further, the number of the test pipelines is three, and the models of the flowmeters to be tested on the three test pipelines are: orifice flowmeter, Venturi flowmeter and rotameter.

Further, the standard flowmeter is a turbine flowmeter.

Further, a thermometer is provided on the pipeline between the water pump and the water storage tank, and the thermometer is connected to the calculation control unit.

Further, the differential pressure transmitter is provided with two drain pipes corresponding to the initial pressure inlet and the final pressure inlet, and the drain pipes are connected to the water storage tank.

Further, the display unit is a paperless recorder.

Further, a drain valve is provided at the bottom of the water storage tank.

Further, a U-shaped differential pressure gauge is connected in parallel between the initial pressure inlet and the final pressure inlet of the differential pressure transmitter.

Further, a transparent water receiving tank is superimposed on the water storage tank, the bottom area of the water receiving tank is known, a scale is provided on the side wall of the water receiving tank, and a timer is hung outside the side wall, and the scale is the height Scale or scale for the volume of water inside.

Compared with the prior art, the utility model directly displays the pressure difference result of the flowmeter to be measured through the differential pressure transmitter, flowmeter, thermometer, calculation control unit and display unit, and directly reads it on the display device. Control the inlet valves and pressure introduction valves on multiple test pipelines to test the flowmeters to be tested on one of the test pipelines independently, which is easy to operate and has small errors; at the same time, three sets of test pipelines are set to test the flow rate of the orifice plate respectively meter, Venturi flowmeter and rotameter, by closing all the valves on two of them and opening all the valves on one of the test pipelines, the flowmeters to be tested in the group of test pipelines can be accurately tested, and the operation is simple Convenient, accurate target, can test a variety of different flowmeters at the same time; the thermometer can monitor the temperature of the water in real time, and the influence of the water temperature on the test results can be observed and obtained during the test; the drain pipe of the differential pressure transmitter is connected The water storage tank reuses the water; the setting of the U-shaped differential pressure gauge and the water receiving tank can be compared with the manual test results during the operation test of the electronic equipment, and the students manually record the results of the U-shaped differential pressure gauge and calculate the water receiving tank The volume of water and the flow rate converted by time can increase students' hands-on ability and deepen students' understanding of experiments. The utility model can complete the test of different types of flow meters on multiple sets of test pipelines by adjusting the opening and closing of the inlet valve and the pressure introduction valve, and can directly read the results on the display unit by adjusting the water pump and the flow rate, which is fast and simple , The error is small.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Detailed ways

The specific embodiment of the utility model will be described in detail below in conjunction with the accompanying drawings.

Example 1:

A flowmeter checking device, as shown in Figure 1, includes a frame 1, and the frame 1 is provided with an electrical control box 2, a water storage tank 3, a water pump 4, a differential pressure transmitter 5, and a main pipeline 6. The water inlet pipe of the water pump 4 communicates with the bottom of the water storage tank 3, the main pipe 6 is connected with the water outlet pipe of the water pump and then divided into a plurality of test pipelines 61, and each test pipeline 61 is provided with an inlet in turn Valve 62, front pressure introduction valve 63, flowmeter to be tested 64, rear pressure introduction valve 65, the multiple test pipelines 61 converge into the main pipeline 6 and then connected to the outlet valve 7 and then connected to the water storage tank 3. The main pipeline 6 is provided with a standard flow meter 8, and all the front pressure introduction valves 63 on the multiple test pipelines 61 are connected in parallel to the initial pressure water inlet of the differential pressure transmitter 5, and all the rear pressure introduction valves 65 are connected in parallel. The final pressure water inlet of the differential pressure transmitter 5 is connected, the electrical control box 2 is composed of a calculation control unit and a display unit, the water pump 4, the standard flow meter 8, and the differential pressure transmitter 5 are connected to the calculation control unit connect.

Further, the number of the test pipelines 61 is three, and the models of the flowmeters to be tested on the three test pipelines 61 are respectively: an orifice flowmeter, a Venturi flowmeter and a rotameter. In this embodiment, only two test pipelines are used to test the orifice flowmeter and the Venturi flowmeter respectively, while the rotameter needs to be installed vertically and occupies a large space. This embodiment does not add it to the test device. But if you want to add it, the connection method is the same as the orifice flowmeter and Venturi flowmeter, but you need to pay attention to install the rotameter vertically in the pipeline.

Further, the standard flowmeter 8 is a turbine flowmeter.

Further, a thermometer 9 is provided on the pipeline between the water pump 4 and the water storage tank 3, and the thermometer 9 is connected with the calculation control unit.

Further, the differential pressure transmitter 5 is provided with two drain pipes corresponding to the initial pressure inlet and the final pressure inlet, and the drain pipes are connected to the water storage tank 3 .

Further, the display unit is a paperless recorder.

Further, a drain valve 31 is provided at the bottom of the water storage tank 3 .

Further, a U-shaped differential pressure gauge 10 is connected in parallel between the initial pressure inlet and the final pressure inlet of the differential pressure transmitter 5 .

Further, a transparent water receiving tank 32 is superimposed on the water storage tank 3, the bottom area of the water receiving tank 32 is known, a scale is provided on the side wall of the water receiving tank 32, and a timer 33 is hung outside the side wall, The scale is an altitude scale or a volume scale of the internal water.

Compared with the prior art, the utility model directly displays the pressure difference result of the flowmeter to be measured through the differential pressure transmitter, flowmeter, thermometer, calculation control unit and display unit, and directly reads it on the display device. Control the inlet valves and pressure introduction valves on multiple test pipelines to test the flowmeters to be tested on one of the test pipelines independently, which is easy to operate and has small errors; at the same time, three sets of test pipelines are set to test the flow rate of the orifice plate respectively meter, Venturi flowmeter and rotameter, by closing all the valves on two of them and opening all the valves on one of the test pipelines, the flowmeters to be tested in the group of test pipelines can be accurately tested, and the operation is simple Convenient, accurate target, can test a variety of different flowmeters at the same time; the thermometer can monitor the temperature of the water in real time, and the influence of the water temperature on the test results can be observed and obtained during the test; the drain pipe of the differential pressure transmitter is connected The water storage tank reuses the water; the setting of the U-shaped differential pressure gauge and the water receiving tank can be compared with the manual test results during the operation test of the electronic equipment, and the students manually record the results of the U-shaped differential pressure gauge and calculate the water receiving tank The volume of water and the flow rate converted by time can increase students' hands-on ability and deepen students' understanding of experiments. The utility model can complete the test of different types of flow meters on multiple sets of test pipelines by adjusting the opening and closing of the inlet valve and the pressure introduction valve, and can directly read the results on the display unit by adjusting the water pump and the flow rate, which is fast and simple , The error is small.

The basic principles, main features and advantages of the present utility model have been shown and described above. The utility model is not limited by the above-mentioned embodiments, and what is described in the above-mentioned embodiments and the description only illustrates the principle of the utility model, and the utility model also has various changes and improvements without departing from the spirit and scope of the utility model , these changes and improvements all fall within the scope of the claimed utility model. The scope of protection required by the utility model is defined by the appended claims and their equivalents.

Claims (9)

1. a kind of flowmeter capacity checking device, it is characterised in that: include rack, the rack be equipped with electric control box, water storage box, The water inlet pipe of water pump, pressure difference transmitter and main pipeline, the water pump is connected with water storage box bottom, the main pipeline and water pump Outlet pipe be connected after be split into multiple test pipelines, each test pipeline is successively arranged inlet valve, leading pressure valve, to flow measurement Meter, rear impulse valve, the multiple test pipeline pool accessed in water storage box after main pipeline after connection outlet valve again, the master Pipeline is equipped with proving flowmeter, and the first indentation of pressure difference transmitter is accessed after all leading pressure valves of multiple testing tube roads are in parallel The final pressure water inlet of pressure difference transmitter is accessed at the mouth of a river after all rear impulse valves are in parallel, the electric control box is by calculating control list Member and display unit composition, the water pump, proving flowmeter, pressure difference transmitter are connected with calculation control unit.

2. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the quantity of the test pipeline is three The model on road, the flowmeter to be measured of three drive test test tube roads is respectively as follows: orifice flowmeter, Venturi meter and spinner Meter.

3. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the normal flow is calculated as turbine flow Meter.

4. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the pipe between the water pump and water storage box Road is equipped with thermometer, and the thermometer is connected with the calculation control unit.

5. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the pressure difference transmitter be equipped with it is first It is pressed into the mouth of a river, corresponding two drainpipes of final pressure water inlet, the drainpipe accesses in water storage box.

6. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the display unit is paperless tests Instrument.

7. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the bottom of the water storage box is equipped with draining Valve.

8. a kind of flowmeter capacity checking device as described in claim 1, it is characterised in that: the first indentation water of the pressure difference transmitter A U-shaped difference gauge in parallel between mouth and final pressure water inlet.

9. a kind of flowmeter capacity checking device as claimed in claim 8, it is characterised in that: superposition is equipped with one on the water storage box Transparent water receiving case, for the floor space of the water receiving case it is known that the side wall of water receiving case is equipped with scale, side wall is hung with timer outside, The scale be altitude scale or be internal water volume markings.