CN206479237U - A kind of water meter self-checking device - Google Patents

Abstract

An automatic verification device for water meters, comprising a water tank, a stand, a fixing mechanism capable of fixing several water meters to be tested in series arranged in series on the stand, and a water inlet and a water tank connected in series with the water meters to be tested A water supply mechanism, a flow regulating mechanism and a weighing bucket are respectively arranged between the water outlets; the flow regulating mechanism includes a third manual valve and a flow meter arranged in series from bottom to top; The water meter is correspondingly connected and reads the connection line of the water value in the water meter to be tested connected to it. The utility model can verify the water with different flow rates when it flows through the water meter to be tested, and the verification accuracy is high, especially when the flow rate is small, so as to prevent water leakage; the manual valve is used to control the on-off of the pipeline to overcome the overflow. Solenoid valve is prone to short-circuit defects; it is equipped with temperature sensor and pressure sensor, which can detect water temperature and water pressure in real time, reduce the influence of unstable water temperature and water pressure on detection stability, and improve detection accuracy.

Description

A water meter automatic verification device

technical field

The utility model relates to the technical field of water meter verification, in particular to an automatic water meter verification device.

Background technique

The water meter is a flow meter that uses the direct mechanical movement process of the movable wall volume measurement chamber or the effect of the water flow velocity on the wing wheel to calculate the volume of the water flow flowing through the tap water pipeline. It is widely used in tap water, heat, chemical and other industries.

The national metrological verification regulations stipulate that enterprises or measurement departments that produce water meters need to perform error verification on water meters at three flow points: nominal flow, boundary flow, and minimum flow. In the manual static start-stop volume comparison method currently used, the verification personnel need to manually switch the water flow three times, read the indication of the water meter under inspection four times and read the water level of the standard gauge level gauge three times, manually record various data and calculate error. There are many defects in this verification method, such as large workload, low efficiency, low precision, large human error, and unobjective appraisal results.

In response to this situation, automatic water meter verification devices have emerged as the times require, but most of the current automatic water meter verification devices have complex structures and high costs, and do not fully consider the influence of water temperature and water pressure on detection accuracy.

For example, the invention patent CN105651361A discloses an ultrasonic water meter automatic pressure regulation detection and calibration device and method, including an ultrasonic water meter, a weighing device, and a data processing system. The data processing system collects the flow indication of the ultrasonic water meter and the quality data obtained by the weighing device. , calculate the relative error value of each ultrasonic water meter, fit the relative error fitting function according to the flow indication and the error value and return it to the corresponding water meter, so as to correct the mechanical and electronic physical difference factors between different ultrasonic water meters, and the installation process The systematic error caused by the variance factor.

Compared with the manual verification method, the verification device has high efficiency and more objective verification results, but this kind of detection device has the following disadvantages: 1. The device has no flow adjustment mechanism, and cannot monitor the flow of water flowing through the water meter to be tested during verification. Adjustment or switching; 2. The water flowing into the water meter is stored in the pressure storage tank in advance, and the temperature of the water will change with the storage time. The device is not equipped with a temperature sensor, so it cannot track and confirm the water density and automatically correct it. As a result, the water density selected by the data processing system according to the water temperature is not accurate enough, and may not meet the water density requirements of the national metrology verification regulations for the quality method; 3. In addition, most of the existing automatic verification devices use solenoid valves to control the on-off of the waterway. If the pipeline overflows, it will lead to a short circuit of the terminals of the solenoid valve, which will affect the entire verification process; 4. The water is always in a flowing state in the circulation system composed of the water storage tank, weighing container, and water meter pipeline. energy saving requirements.

Utility model content

The technical problem to be solved by the utility model is to provide an automatic water meter verification device with high verification accuracy and flow switching in view of the current state of the prior art.

The technical scheme adopted by the utility model to solve the above-mentioned technical problems is: an automatic water meter verification device, including a water tank and a stand, and the stand is provided with a plurality of water meters to be tested that can be arranged in series and fixed on the stand. A fixing mechanism, a water supply mechanism capable of inputting the water in the water tank into the water meter to be tested is provided between the water tank and the water inlet end of the water meter series group to be tested, and the water outlet end of the water meter series group to be tested passes through the first pipeline Connected to the weighing barrel used to measure the weight of the water passing through the water meter to be tested; multiple groups are connected in parallel between the first pipeline and the water outlet of the water meter to be tested in series to make the water flow through the water meter to be tested. A flow regulating mechanism, the flow regulating mechanism includes a third manual valve and a flow meter arranged in series from bottom to top; the upper part of the platform is provided with a plurality of water meters for corresponding connection with each water meter to be tested and reading the connected water meter. The connection line of the water value in the water meter.

As a further improvement, a temperature sensor and a first pressure sensor are provided between the water supply mechanism and the water inlet of the water meter series group to be tested to detect the water temperature and water pressure in real time to ensure that the water temperature and water pressure meet the requirements, and eliminate the adverse effects of water temperature or pressure instability. The impact of detection stability can be improved to improve the detection effect.

As a further improvement, a first manual valve is provided between the temperature sensor and the first pressure sensor, so that the on-off of the pipeline can be controlled by itself.

Further improvement, the water outlet end of the weighing bucket is connected with a second pipeline, and the second pipeline is provided with a second manual valve, and the water in the weighing bucket flows back to the water tank through the second pipeline for next use.

As a further improvement, the fixing mechanism includes several connecting pipes capable of connecting two adjacent water meters to be tested, and upper joints and lower joints respectively located at both ends of the series group of water meters to be tested. pump, the hydraulic pump is fixed on the platform, the upper joint is fixed on the hydraulic pump; the lower joint is fixed on the platform, and the inside communicates with the first pipeline. The hydraulic pump is preferably a plunger pump, the hydraulic pump is fixed on the stand, and the upper joint is fixed on the piston rod of the hydraulic pump. When the piston rod moves, it drives the upper joint to move axially, changing the distance between the upper joint and the lower joint, thereby Make the seal of the water meter to be tested tightened.

Further improvement, the water supply mechanism includes a water pump and a surge tank, the water inlet end of the water pump is connected to the tank, and the water outlet is connected to the surge tank, and the water in the tank is sucked into the surge tank through the water pump; A second pressure sensor is provided in the surge tank, and the buffering of the surge tank can ensure that the water pressure input into the water meter to be tested is stable, thereby eliminating the influence of pressure instability on the detection stability and improving the detection effect; The tank communicates with the hydraulic pump through a first manual valve.

Further improvement, a fourth manual valve is also provided between the surge tank and the water pump, which not only can return the water in the surge tank to the water tank after the measurement, reducing the detection energy consumption; The water tank forms a small circulation loop, so that the water temperature between the two is consistent, and the influence of inconsistent water temperature on the detection stability is eliminated.

Compared with the prior art, the utility model has the following advantages: 1. By setting the flow regulating mechanism, the water with different flow rates can be verified when it flows through the water meter to be tested, and the verification accuracy is high, especially when the flow rate is small. , so that the qualified water meter can ensure that dripping water can also be measured; 2. There is a temperature sensor and a first pressure sensor at the water inlet of the water meter to be tested, which can detect the water temperature and water pressure in real time, and reduce the instability of the water temperature and water pressure. 3. Use the manual valve to control the on-off of the pipeline, not only the detection energy consumption is low, but also the defect that the solenoid valve is easy to short circuit when the water overflows.

Description of drawings

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

detailed description

The utility model is described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, it is a preferred embodiment of the water meter automatic verification device of the present invention.

The utility model discloses an automatic verification device for a water meter, which comprises a water tank 1, a stand 21, a water supply mechanism, a fixing mechanism, a flow regulating mechanism 66 and a weighing bucket 62. The device also includes a PLC3 and a host computer 4 connected to the PLC3. Both the host computer 4 and the PLC3 have systems or programs developed according to the conditions. The water meter 22 to be tested and the host computer 4 communicate bidirectionally based on the M-BUS line.

As shown in Figure 1, the stand 21 is provided with a fixing mechanism that can fix several water meters to be measured 22 arranged in series on the stand 21. This preferred embodiment detects four water meters to be tested 22 connected in series at the same time. Of course, the number of water meters 22 to be tested can be determined by itself according to needs. The fixing mechanism for fixing the water meter 22 to be tested includes three connecting pipes 23, an upper joint and a lower joint. All the connecting pipes 23 are arranged coaxially. The joint and the lower joint are respectively located at both ends of the joint assembly composed of all the joints 23 , and the upper joint and the lower joint are arranged coaxially with the joints 23 , and the lower joint is fixed on the stand 21 . A hydraulic pump 24 is arranged between the upper joint and the stand 21 . In this preferred embodiment, the hydraulic pump 24 is a plunger pump, the hydraulic pump 24 is fixed on the stand, and the upper joint is fixed on the piston rod of the hydraulic pump 24. When the piston rod moves, the upper joint moves axially, changing the upper joint and the distance between the lower joint, so that the water meter 22 to be tested is tightly clamped.

In addition, the upper part of the platform 21 is provided with a plurality of connecting lines for correspondingly connecting with each water meter 22 to be tested and reading the water value in the connected water meter 22 to be tested, so as to communicate with the host computer 4 bidirectionally.

A water supply mechanism that can input the water in the water tank 1 into the water meter 22 to be tested is provided between the water inlet end of the water tank 1 and the water meter 22 to be tested in series. The water supply mechanism includes a water pump 51 and a surge tank 52, and the water inlet of the water pump 51 The end is connected to the water tank 1, and the water outlet is connected to the surge tank 52. The water supply mechanism sucks the water in the water tank 1 into the pressure tank 52 through the water pump 51. The pressure tank 52 is equipped with a real-time monitoring water pressure and is connected to PLC3. The second pressure sensor 53 of the second pressure sensor 53 can ensure that the water pressure input into the water meter 22 to be tested is stable through the buffer of the surge tank 52, thereby eliminating the influence of pressure instability on the detection stability and improving the detection effect.

In addition, in this preferred embodiment, a fourth manual valve 54 is provided between the water pump 51 and the surge tank 52. On the one hand, after the measurement is completed, the water in the surge tank 52 is returned to the water tank 1 to reduce energy consumption for detection. ; On the other hand, the small circulation loop formed by the surge tank 52 and the water tank 1 makes the water temperature between the two consistent, and eliminates the influence of inconsistent water temperature on the detection stability.

In order to further ensure that the water temperature and water pressure meet the requirements, the pipeline connecting the hydraulic pump 24 and the water supply mechanism is provided with a temperature sensor 71 and a first pressure sensor 72 that are all connected to the PLC3 to detect the water temperature and water pressure in real time, and eliminate the water temperature or pressure. The impact of instability on the detection stability improves the detection effect; at the same time, in order to be able to control the on-off of the waterway by itself, a first manual valve 73 is also provided between the temperature sensor 71 and the first pressure sensor 72, and the first manual valve 73 is opened. After that, the water enters the hydraulic pump 24 to push the piston rod to move, so that the water meter 22 to be tested is sealed and clamped.

The water outlet of the water meter 22 to be tested in series is connected to the weighing barrel 62 for measuring the weight of the water passing through the water meter 22 to be measured through the first pipeline 63. The weighing barrel 62 is provided with an electronic scale 61, and the electronic scale 61 and PLC3 Connect to feed back the weight of the water to PLC3, and the upper computer 4 can read the data in real time. The outlet end of the weighing bucket 62 is connected with a second pipeline 64, and the second pipeline 64 is provided with a second manual valve 65. After the second manual valve 65 is opened, the water in the weighing bucket 61 can flow into the water tank 1, Wait for the next test to use.

Between the first pipeline 63 and the water outlet of the water meter 22 to be tested in series, multiple sets of flow regulating mechanisms 66 are connected in parallel to allow the water to flow through the water meter 22 to be measured at a constant flow rate. The third manual valve 67 and the flow meter 68. The third manual valve 67 can control the on-off of the pipeline, and the flow meter 68 can control the flow and ensure the flow rate of water flowing through the water meter 22 to be tested.

This preferred embodiment is divided into three groups of flow regulating mechanisms 66 according to the size of the flow rate. Each group of flow regulating mechanisms 66 is set independently of each other and communicates with the first pipeline 63. When testing a flow point, only the corresponding third manual valve 67 is opened. , close the third manual valve 67 of the other two groups, and then the verification can be carried out.

When using the verification device of this preferred embodiment, the water in the water tank 1 is sucked into the surge tank 52 through the water pump 51, then passes through the water meter 22 to be tested, the flow regulating mechanism 66 to the weighing bucket 62, and finally passes through the first The second pipeline 64 returns to the water tank 1 . When performing water meter verification, steps such as clamping, water flow and exhaust, detection and data collection, and calculation are required in sequence.

a. First, adjust each component after power on, and check whether the water temperature and water pressure displayed on the upper computer 4 reach the designed pressure value.

b. Fix the water meter 22 to be tested in series on the stand 21 through the connecting pipe 23, turn on the hydraulic pump 24 to push the piston rod out and push the water meter 22 to be tested and the connecting pipe 23 to move, so that the two ends of the water meter 22 and the connecting pipe 23 The joints between the components are all in a sealed and clamped state, so as to avoid water leakage and make the characteristics of the water meter 22 to be tested wrongly evaluated.

c. Then turn on the water pump 51 to continuously supply water into the pipeline and then discharge the gas in the pipeline. Generally, first open the third manual valve 67 of the large flow rate regulating mechanism 66 to discharge a large amount of air bubbles, and then open the medium flow rate and small flow rate regulating mechanism 66 The third manual valve 67 until there is no air bubbles; at the same time, the water of the same water temperature flows through each pipeline to realize the uniform temperature treatment of each pipeline and container. The temperature sensor 71 collects the water temperature and feeds it back to the host computer 4. The calculated density of water is looked up in the temperature-density table of water stored in the database.

d. First close the first manual valve 73 and all the third manual valves 67 on the flow regulating mechanism 66 after passing water and exhaust, and close the second manual valve 65 on the second pipeline 64 after a certain period of time, and wait for the electronic scale 61 to stabilize Then measure the weight of the weighing bucket 62 and feed it back to the host computer 4 .

e. Subsequently, according to the set meter calibration point, the flow rate of the relevant valves is adjusted in the corresponding time in turn, and the upper computer 4 continuously reads the data of the electronic scale; and the upper computer 4 is based on the M-BUS line and each water meter 22 to be tested Two-way communication, directly read the volume value of water flowing through each water meter 22 to be tested.

f. Calculate the error of each water meter 22 to be tested according to the formula stored in the host computer 4 and display the calculation results one by one. The preset error value is stored in the host computer 4. When the error value of each water meter 22 to be tested is greater than the preset When the error value is exceeded, the detection of the flow point is completed.

g. After the detection of all flow points is completed, the second manual valve 65 is opened, and water flows from the weighing bucket 62 into the water tank 1 for the next use.

Although the preferred embodiments of the present invention have been described in detail, it should be clearly understood that various modifications and changes may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims (7)

1. a kind of water meter self-checking device, including tank (1), stand (21), the stand (21) will be gone here and there successively provided with energy Several water meters (22) to be measured that connection is set are fixed on the fixed mechanism on stand (21), the tank (1) and water meter to be measured (22) it is described provided with the water supply mechanism that can input the water in tank (1) in water meter (22) to be measured between the water inlet end of series connection group The water side of water meter (22) series connection group to be measured is connected to measure the water by water meter to be measured (22) by the first pipeline (63) Weight weighing bucket (62)；It is characterized in that：First pipeline (63) connected with water meter to be measured (22) group water side it Between be parallel with it is multigroup to make the certain flow control device (66) of flow velocity of the current through water meter to be measured (22), flow control device (66) the 3rd hand-operated valve (67) and flowmeter (68) being arranged in series from bottom to top are included；The top of the stand (21) is provided with more Root connects and read the water meter to be measured (22) being attached thereto to corresponding with each water meter (22) to be measured and fall into a trap the connection of water numerical value Line.

2. water meter self-checking device according to claim 1, it is characterised in that：The water supply mechanism and water meter to be measured (22) temperature sensor (71) and first pressure sensor (72) are provided between the water inlet of series connection group.

3. water meter self-checking device according to claim 2, it is characterised in that：The temperature sensor (71) and first First manual valve (73) is provided between pressure sensor (72).

4. water meter self-checking device according to claim 1, it is characterised in that：Weighing bucket (62) the water side connection There is second pipe (64), the second pipe (64) is provided with the second hand-operated valve (65).

5. water meter self-checking device according to claim 1, it is characterised in that：The fixed mechanism includes several energy It is located at the connected adapter (23) of two neighboring water meter (22) to be measured and respectively the top connection at water meter to be measured (22) series connection group two ends And lower contact, hydraulic pump (24) is provided between the top connection and stand (21), the hydraulic pump (24) is fixed on stand (21) On, top connection is fixed on hydraulic pump (24)；The lower contact is fixed on stand (21), and internal and the first pipeline (63) is even It is logical.

6. water meter self-checking device according to claim 1, it is characterised in that：The water supply mechanism includes water pump (51) With vacuum tank (52), the water inlet end of the water pump (51) is connected with tank (1), and its water side is connected with vacuum tank (52), described Second pressure sensor (53) is provided with vacuum tank (52), the vacuum tank (52) passes through first manual valve (73) and hydraulic pump (24) connect.

7. water meter self-checking device according to claim 6, it is characterised in that：The vacuum tank (52) and water pump (51) Between be additionally provided with the 4th hand-operated valve (54).