CN202350881U - Full-automatic water meter calibrating device - Google Patents

Abstract

The utility model relates to the technical field of water meter verification devices, in particular to a device for automatic verification of water meters. This kind of water meter automatic verification device is composed of a pipeline pump, a main water inlet pneumatic valve, a water meter to be tested, a solenoid valve, an electromagnetic flowmeter and a working volume are connected in sequence through pipelines to form a circuit. The bottom of the working volume is equipped with an electronic scale. There is a drain electromagnetic valve at the water outlet of the device, a constant temperature water tank is installed between the pipeline pump and the working volume, a temperature sensor and a pressure sensor are installed between the main water inlet pneumatic valve and the water meter to be inspected, and the water meter to be inspected and the electromagnetic flowmeter are installed. There is a pressure test pneumatic valve between them. A vacuum solenoid valve is connected between the water meter to be tested and the pressure test pneumatic valve. A vacuum check valve, a vacuum water filter and a vacuum pump are connected in series on the vacuum solenoid valve. The water meter to be tested It is equipped with a photoelectric reading system. The utility model has the advantages of simple structure, stable performance, high precision and high degree of automation.

Description

Water meter automatic verification device

technical field

The utility model relates to the technical field of water meter verification devices, in particular to a device for automatic verification of water meters.

Background technique

The existing domestic traditional meter calibration method is: install the meter-manually open and stop the rotameter control valve exhaust-manually operate the pressure relief valve-manually exhaust-manually record the current red pointer data-check the nominal flow- Shut off the water manually after the water reaches 100L - manually record the red pointer data and calculate - verify the boundary flow rate - manually shut down the water after the water reaches 20L - manually record the red pointer data and calculate - verify the minimum flow rate - use water to reach After 10L of water, manually shut off the water - manually record the red pointer data and calculate - unload the meter. Calibration with the new standard of 20mm caliber water meters takes 45 minutes each time (7 water meters), which has low efficiency and large human errors.

At present, there are three kinds of water meter calibration devices we use:

1) Manually operated calibrating device with pressure-resistant water meter in series (static start-stop volumetric method device): This device is a relatively primitive static start-stop volumetric method device, which uses the judgment of human eyes for manual operation and reads the number of the red pointer , Adjust the flow point and the start and stop of the water consumption of the stopwatch, there is a lot of human error. The efficiency of meter calibration is low, the error is large, and the staff uses a lot.

2) Infrared control type calibrating device with pressure-resistant water meter in series (static start-stop volume method device): this kind of device is equipped with infrared limit switch and solenoid valve on the manually operated device, which relatively reduces manual shutdown errors in water. The instability and reading of the infrared limit switch still use the manual reading method, which determines that the error of the device is still very large.

3) Camera-type calibrating device with pressure-resistant water meter in series (static start-stop quality method device): This kind of device has undergone major changes on the manually-operated device and realized semi-automation. Installing a camera instead of manual copying; replacing the measuring barrel with an electronic scale, but without installing a commutator, there is an increased error; installing an electronic control valve, which relatively improves the accuracy of meter calibration. However, the readings of the camera are easily disturbed by the external light source and the air bubbles in the meter head, and it is easy to cause random readings and non-reading phenomena, which require timely correction by the operator, and many personnel use it, resulting in many reading errors.

Utility model content

The technical problem to be solved by the utility model is: to overcome the deficiencies in the prior art, and provide a water meter automatic calibration and verification device with stable performance, high precision and high efficiency.

The technical solution adopted by the utility model to solve the technical problems is: a fully automatic water meter verification device, which is connected in turn by a pipeline pump, a main water inlet pneumatic valve, a water meter to be checked, an electromagnetic valve, an electromagnetic flowmeter and a working gauge through pipelines. A circuit is formed, the water meter to be checked is fixed on the meter calibration platform, the bottom of the working volume is provided with an electronic scale, and the outlet end of the working volume is provided with a drain solenoid valve, and the pipeline pump and the working volume are connected There is a constant temperature water tank, a temperature sensor and a pressure sensor are provided between the general water inlet pneumatic valve and the water meter to be tested, a pressure test pneumatic valve is connected between the water meter to be checked and the electromagnetic flowmeter, and the water meter to be checked and the electromagnetic flowmeter are connected to each other. A vacuum solenoid valve is connected between the pressure test pneumatic valves, and a vacuum check valve, a vacuum water filter and a vacuum pump are arranged in series on the vacuum solenoid valve, and a photoelectric reading system is provided on the water meter to be tested.

The solenoid valve described in the utility model is a nominal flow solenoid valve and a boundary small flow solenoid valve arranged in parallel.

The temperature sensor, pressure sensor, photoelectric reading system, nominal flow solenoid valve, boundary small flow solenoid valve and electronic scale described in the utility model are connected with the industrial control program control system through wires.

The industrial control program control system described in the utility model is connected with the withstand voltage test system through electric wires.

The working measuring device described in the utility model is a 150L working measuring device and a 30L working measuring device connected in parallel on the constant temperature water tank.

The 150L working measuring device described in the utility model is connected with the nominal flow solenoid valve through the DN25 electromagnetic flowmeter, the bottom of the 150L working measuring device is provided with a 150KG electronic scale, and the water outlet end of the 150L working measuring device is provided with a 150L measuring device drain valve .

The 30L working volume device described in the utility model is connected with the boundary small flow solenoid valve through the DN10 electromagnetic flowmeter, and a DN15 commutator is provided between the working volume device and the DN10 electromagnetic flowmeter, and the bottom of the 30L working volume device is provided with 30KG electronic scale, the water outlet end of the 30L working measure is provided with a 30L measuring measure drain valve.

The meter calibration platform described in the utility model is a double-row type calibration platform.

The beneficial effects of the utility model are: the utility model has the advantages of simple structure, stable performance, high precision, and high degree of automation. After installing the watch, as long as the start button is clicked on the computer operation interface, the device will sequentially complete the vacuum exhaust-pressure test --Nominal flow rate--Boundary flow rate--Minimum flow rate detection. After the verification, the computer verification software equipped with the device automatically calculates the verification results according to the regulations and saves them. It has complete database functions such as verification data query, correction, statistics, and printing. .

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

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

In the figure 1. constant temperature water tank, 2. pipeline pump, 3. main water inlet pneumatic valve, 4. temperature sensor, 5. pressure sensor, 6. pressure test system, 7. photoelectric reading system, 8. vacuum solenoid valve, 9. Pneumatic valve for pressure test, 10. Nominal flow solenoid valve, 11. DN25 electromagnetic flowmeter, 12.150L working gauge, 13.150KG electronic scale, 14.150L gauge drain valve, 15. Boundary small flow solenoid valve, 16. DN10 electromagnetic flowmeter, 17. DN15 commutator, 18.30L working volume, 19.30KG electronic scale, 20.30L volume drain valve, 21. Vacuum check valve, 22. Vacuum water filter, 23. Vacuum pump, 24. Industrial control program control system, 25. Water meter to be inspected.

Detailed ways

The utility model is described further in conjunction with accompanying drawing now. These drawings are simplified schematic diagrams only to illustrate the basic structure of the utility model in a schematic way, so they only show the configurations related to the utility model.

As shown in Figure 1, the water meter automatic verification device, the water flow is injected into the meter calibration station through the pipeline pump 2, and then passes through the main water inlet pneumatic valve 3, the water meter 25 to be tested, the electromagnetic flowmeter, and the DN15 commutator 17 to the working volume. Get back to constant temperature water tank 1 at last. When the water flow is stable, the DN15 commutator 17 is switched, and the electronic scale measurement and the photoelectric sensor reading are performed simultaneously. When the set measurement value is reached, the commutator is switched again, and the industrial control program control system extracts the actual measurement value and the photoelectric sensor reading value for data processing.

skills requirement:

1) Electronic scales: 2 high-precision electronic scales of 150KG and 60KG with an accuracy level better than 1/6000;

2), pressure sensor: -0.1-2.5MPa high sensitivity pressure sensor;

3), temperature sensor: 0-100 ℃ high-sensitivity sensor;

4) Photoelectric sensor: self-developed photoelectric sensor with double optical fiber, visible infrared and working indicator light;

5), constant temperature water tank: 2.0m ³ water tank;

6) Vacuum pump: high power and low energy consumption vacuum pump.

The specific operation steps are as follows:

1) First, set the verification flow values of nominal, boundary and small flow on the program-controlled software operation interface.

2), install the water meter 25 to be checked on the automatic device, click the start button on the software operation interface, the industrial control program control system 24 controls the vacuum pump 23 to start working, and opens the vacuum pumping solenoid valve 8, and the pressure sensor 5 transmits the value to the industrial control program control system 24, The air in the water meter 25 to be tested and the test straight pipe section is discharged through the vacuum check valve 21 and the vacuum water filter 22, and the vacuum degree reaches the set value (the test value is displayed on the operation interface), and the vacuum pump 23 and the vacuum solenoid valve 8 are closed, and the end automatic exhaust work;

3), after the automatic exhaust work, the industrial control program control system 24 controls to open the main water inlet pneumatic valve 3, the nominal flow solenoid valve 10, and the boundary small flow solenoid valve 15, fill the water meter 25 to be checked with water, and close the main water inlet after a certain period of time Pneumatic valve 3, nominal flow solenoid valve 10, boundary small flow solenoid valve 15 and pressure test pneumatic valve 9, open the pressure test system 6, and the pressure sensor 5 transmits the value to the industrial control system 24, when the pressure value reaches the set value (the test value is displayed on the operation interface), the pressure test program is automatically closed, and after maintaining the pressure for 1 minute, the main water inlet pneumatic valve 3, the pressure test pneumatic valve 9, the nominal flow solenoid valve 10, and the boundary small flow solenoid valve 15 are opened for drainage After a certain period of time, close the main water inlet pneumatic valve 3, the nominal flow solenoid valve 10, and the boundary small flow solenoid valve 15, and end the automatic pressure test;

4), after the automatic withstand voltage test is finished, the industrial control program control system 24 controls to open the main water inlet pneumatic valve 3, the nominal flow solenoid valve 10, and the photoelectric reading system 7 works, and simultaneously performs the measurement of the DN25 electromagnetic flowmeter 11 and the reading of the photoelectric sensor, and the water flow enters 150L working volume device 12, when the water consumption reaches the set value, the 150KG electronic scale 13 feeds back a signal to the industrial control program control system 24, closes the nominal flow solenoid valve 10, and the industrial control program control system 24 extracts the actual measured value of the 150KG electronic scale 13 and the photoelectric sensor reading While performing data processing on the numerical value, the actual temperature value of the test water is fed back by the temperature sensor 4, and the water density is trimmed in the background, and the obtained result is compared with the actual measurement value of the extracted DN25 electromagnetic flowmeter 11 to obtain the final detection result (the test value is displayed on the operation interface), open the 150L measuring device drain valve 14 to empty the water in the 150L working measuring device 12, close the 150L measuring device drain valve 14, and end the nominal flow detection;

5), after the automatic nominal flow detection work is completed, the industrial control program control system 24 controls to open the boundary small flow solenoid valve 15, and the photoelectric reading system 7 works. When the water flow is stable, the DN10 electromagnetic flowmeter 16 feeds back the desired signal to the industrial control program control system 24, DN15 The commutator 17 switches the water flow into the 30L working volume device 18, simultaneously carries out the 30KG electronic scale 19 measurement and the photoelectric sensor reading, when the water consumption reaches the set value, the DN15 commutator 17 switches again, and the industrial control program control system 24 extracts the 30L working volume device The actual measurement value in 18 and the photoelectric sensor reading value are processed for data, and at the same time, the actual temperature value of the test water is fed back through the temperature sensor 4, and the water density is trimmed in the background. While performing data processing on the sensor readings, the temperature sensor 4 feeds back the actual temperature value of the test water to correct the water density in the background, and compares the obtained results with the actual measurement values extracted from the DN10 electromagnetic flowmeter 16 to obtain the final Test results (the test value is displayed on the operation interface), close the main water inlet pneumatic valve 3, the boundary small flow solenoid valve 15, open the 30L measuring device drain valve 20 to drain the water in the 30L working measuring device 18, and close the 30L measuring device drain valve 20 , end the demarcation small flow detection;

6) After the test is completed, the industrial control program control system 24 automatically generates all test data reports, displays them on the operation interface, stores them in the program control database, and can be viewed and printed at any time; all pneumatic valve solenoid valves return to the original state, ready for the next water meter test .

The above-mentioned embodiments are only to illustrate the technical conception and characteristics of the present utility model. Equivalent changes or modifications made by the spirit of the present utility model shall be covered within the protection scope of the present utility model.

Claims (8)

1. A water meter automatic verification device, which is composed of a pipeline pump (2), a total water inlet pneumatic valve (3), a water meter to be checked (25), an electromagnetic valve, an electromagnetic flowmeter and a working volume are connected in sequence through pipelines to form a loop, The water meter (25) to be checked is fixed on the meter calibration platform, the bottom of the working measuring device is provided with an electronic scale, and the water outlet end of the working measuring device is provided with a drain electromagnetic valve, and it is characterized in that: the pipeline pump (2) A constant temperature water tank (1) is connected with the working volume, and a temperature sensor (4) and a pressure sensor (5) are arranged between the total water inlet pneumatic valve (3) and the water meter (25) to be checked. A pressure test pneumatic valve (9) is connected between the water meter to be checked (25) and the electromagnetic flowmeter, and a vacuum solenoid valve (8) is connected between the water meter to be checked (25) and the pressure test pneumatic valve (9). , the vacuum solenoid valve (8) is provided with a vacuum check valve (21), a vacuum water filter (22) and a vacuum pump (23) in series, and the water meter to be checked (25) is provided with a photoelectric reading system ( 7). 2. The automatic water meter verification device according to claim 1, characterized in that: said solenoid valve is a nominal flow solenoid valve (10) and a boundary small flow solenoid valve (15) arranged in parallel. 3. The automatic water meter verification device according to claim 1, characterized in that: the temperature sensor (4), the pressure sensor (5), the photoelectric reading system (7), the nominal flow solenoid valve (10), the boundary The small flow electromagnetic valve (15) and the electronic scale are connected with the industrial control program control system (24) through electric wires. 4. The automatic water meter verification device according to claim 3, characterized in that: said industrial control program control system (24) is connected to the withstand voltage test system (6) through wires. 5. The water meter automatic verification device according to claim 1, characterized in that: the working volume is a 150L working volume (12) and a 30L working volume (18) connected in parallel to the constant temperature water tank (1). ). 6. The water meter automatic verification device according to claim 5, characterized in that: the 150L working volume device (12) is connected to the nominal flow solenoid valve (10) through a DN25 electromagnetic flowmeter (11), and the 150L working volume The bottom of the device (12) is provided with a 150KG electronic scale (13), and the water outlet of the 150L working device (12) is provided with a 150L measuring device drain valve (14). 7. The water meter automatic verification device according to claim 5, characterized in that: the 30L working volume device (18) is connected to the boundary small flow solenoid valve (15) through a DN10 electromagnetic flowmeter (16), and is in operation A DN15 commutator (17) is provided between the measuring device (18) and the DN10 electromagnetic flowmeter (16), and a 30KG electronic scale (19) is provided at the bottom of the 30L working measuring device (18), and the 30L working The water outlet of the measuring device (18) is provided with a 30L measuring device drain valve (20). 8. The automatic water meter verification device according to claim 1, characterized in that: said meter calibration station is a double-row meter calibration station. the

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