Water return part of water meter verification equipment

Abstract

The utility model discloses a water return part of water meter verification equipment, which comprises a front water return pipe and a first water return branch, the front water return pipe is communicated with an outlet of a detection part, an inlet of the first water return branch is communicated with the front water return pipe, an outlet of the first water return branch is communicated with a large weighing box, and the large weighing box is positioned on a large scale. The large weighing box is communicated with the main water tank through a first rear water return pipe; the water return part further comprises a second water return branch and a third water return branch, inlets of the second water return branch and the third water return branch are communicated with the front water return pipe, outlets of the second water return branch and the third water return branch are communicated with an inlet of a one-way back pressure valve, an outlet of the one-way back pressure valve is communicated with a small weighing box through a discharge pipe, and the small weighing box is located on a small scale. And the small weighing box is communicated with the main water tank through a second rear water return pipe. The water return part can ensure convenient, accurate and stable detection of large, medium and small flow points.

Description

Technical Field

[0001] The utility model relates to the field of water meter detection and verification, in particular to a water return part of water meter verification equipment. Background Art

[0002] Before a water meter leaves the factory, it needs to be verified using calibration equipment to verify that its measurement is accurate. The water meter calibration equipment in the prior art is roughly divided into a water pressure input part, a detection part and a return water part; the water pressure input part includes a main water tank, a pump, a pressure-stabilizing tank, etc., and its function is to pump water from the main water tank to the detection part to provide water pressure and water volume; the detection part includes a detection platform that fixes a row of water meters in series and a suspension beam located above the detection platform, and the suspension beam is fixed with a photoelectric sensor corresponding to each water meter. Water flows through the water meters in series, and the reading generated at each water meter is the water volume measurement value. The photoelectric sensor reads the water volume measurement value of the corresponding water meter and reports it to the main controller such as a PLC chip; the return water part includes a front return water pipe, a scale, a weighing box and a rear return water pipe. After the water is discharged from the water meter of the detection part, it is discharged to the weighing box through the front return water pipe, and the weight is weighed by the scale and reported to the main controller, and the weight is converted into the actual water volume value, and then the indication error is calculated based on the actual water volume value and the water volume measurement value to complete the calibration; thereafter, the water in the weighing box returns to the main water tank through the rear return water pipe.

[0003] This application is about the return water section. When calibrating a water meter in the prior art, it is generally necessary to measure the conditions of three flow points: the common flow, the boundary flow and the minimum flow. The common flow is obviously larger than the latter two. For example, for a water meter with a diameter of 100 mm, its common flow, boundary flow and minimum flow are 100 mm respectively. 3 / s、0.8m 3 / s and 0.5m 3 / s. If a circuit with a single pipe diameter and valve body is used, it is obviously unable to meet the demand for return water pressure stabilization at different flow points. Therefore, the prior art generally adopts two parallel return water branches, one large and one small, and sets an on-off valve, flow meter and flow regulating valve on each branch.

[0004] However, the details of the return water part of the above-mentioned prior art are not perfect and refined, and there are many aspects that need to be improved and optimized. For example, although the common flow occupies a branch exclusively, the boundary flow and the minimum flow still share one branch. The same flow meter and flow regulating valve are used to adjust the two different flow points of small and medium. The operation is still inconvenient and inaccurate, and the corresponding return water pressure is also unstable; and each weighing box of the return water part is directly placed on the corresponding scale. According to regulations, every three months, weights must be placed to calibrate the scale, that is, empty the water in the weighing box, and then put the weights into the weighing box to calibrate the scale. After the calibration, the weights need to be taken out of the scale. The upper opening of the weighing box is narrow, the side wall is high, and the box body is deep, which makes it difficult to take and put manually. Therefore, the calibration process is cumbersome, time-consuming and laborious; in addition, the two branches of the prior art are equipped with two groups of large and small weighing boxes respectively. When the on-off valve is opened, the detection unit discharges water from the water meter in series to the corresponding weighing box, but at the beginning of the valve opening, there is a process for the flow to reach the set value from 0. During this process, the water meter pressure is unstable, which is not conducive to the accuracy of water meter measurement. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a water return part of a water meter calibration device which can ensure convenient, accurate and stable detection of large, medium and small flow points.

[0006] The technical solution of the utility model is to provide a water return part of a water meter calibration device, which includes a front water return pipe and a first water return branch, the front water return pipe is connected to the outlet of the detection part, the inlet of the first water return branch is connected to the front water return pipe, the first water return branch is sequentially arranged with a first on-off valve, a first flow meter and a first flow regulating valve, the outlet of the first water return branch is connected to a large weighing box, the large weighing box is located on a large scale, and the large weighing box is connected to the main water tank via a first rear water return pipe; the water return part also includes a second water return branch and the third return water branch, the second return water branch is sequentially provided with a second on-off valve, a second flow meter and a second flow regulating valve, the third return water branch is sequentially provided with a third on-off valve, a third flow meter and a third flow regulating valve; the inlets of the second return water branch and the third return water branch are both connected with the front return water pipe and the outlets are both connected with the inlet of a one-way back pressure valve, the outlet of the one-way back pressure valve is connected with a small weighing box via a drain pipe, the small weighing box is located on the small scale, and the small weighing box is connected with the main water tank via the second rear return water pipe.

[0007] Compared with the prior art, the return water part of the water meter calibration equipment using the above structure has the following advantages.

[0008] First, the return water section is equipped with the first, second and third return water branches in parallel, which correspond to the measurement and verification of the three flow points of large, medium and small, namely the common flow, boundary flow and minimum flow. Each flow point is specially equipped with a separate flow meter and flow regulating valve. According to the magnitude of the flow point, the return water pressure and flow of each branch can be adjusted quickly and conveniently, so that the pressure and flow of each branch can reach the target value quickly and accurately and remain stable during the verification measurement process. Moreover, the layout of the return water section is reasonable, and the components that need to be used separately, such as flow meters, regulating valves, etc., are exclusive to each branch, but the components that can be shared are shared. For example, the magnitude of the boundary flow and the minimum flow are relatively close, and a set of pipes, small weighing boxes, and small scale components can be shared, saving components and reducing costs while ensuring the accuracy of functions. Moreover, the second and third return water branches are matched with a one-way back pressure valve, which has a significant effect of stabilizing flow and pressure for branches with small and medium flows, further improving the accuracy of verification measurement.

[0009] Preferably, the large weighing box and the small weighing box are both provided with four legs, and the large weighing box and the small weighing box are suspended on the corresponding scales by the four legs, and calibration space for placing weights is formed under the large weighing box and the small weighing box; in this way, when calibrating the scale, the weights can be placed directly on the scale in the calibration space. Compared with the process of placing the weights into the weighing box in the prior art, the calibration operation of the present application is obviously more convenient, easier and faster.

[0010] As a further preferred embodiment, a first reversing valve is provided at the outlet of the first return water branch, and two valve ports of the first reversing valve are respectively connected to a large weighing box or a main water tank; a second reversing valve is provided at the outlet of the discharge pipe, and two valve ports of the second reversing valve are respectively connected to a small weighing box or a large weighing box; the first flow meter, the second flow meter and the third flow meter are all connected to the main controller signal, and the main controller is connected to the first reversing valve and the second reversing valve signal.

[0011] Through the above structure, the following functions can be realized. Taking the verification of the first branch as an example, the first on-off valve is opened, and water is pumped into the branch. There is a process for the flow of the branch to rise from 0 to the target value. During this process, the water pressure, flow and other parameters of the water meter are unstable. Therefore, the main controller controls the first reversing valve to discharge the unstable water flow into the main water tank; only when the reading of the first flow meter reaches the target value and stabilizes for a period of time such as 5s, the branch flow meter reports to the main controller, and the main controller drives the first reversing valve to reverse and discharge the stable water flow into the large weighing box to measure the actual value of its water volume. For the second and third branches, the unstable water flow is first discharged into the large weighing box, and then the water pressure and flow are reversed after stabilization, and the water flow is discharged into the small weighing box. Of course, the main controller can also adopt a delay control mode, that is, the flow meter of the branch starts to read and the timing is delayed for a period of time such as 30s. The water pressure of the branch must have stabilized, and then the reversing valve is driven to reverse. From the above analysis, it can be seen that this structure can further improve the accuracy of measuring the actual value of water volume in each branch, thereby improving the accuracy of verification. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model is a schematic diagram of the structure of the water return part of the water meter calibration equipment.

[0013] Figure 2 yes Figure 1 Schematic diagram of the structure after deflection at a certain angle.

[0014] As shown in the figure, 1. the first return water branch, 2. the second return water branch, 3. the third return water branch, 4. the front return water pipe, 5. the first on-off valve, 6. the first flow meter, 7. the first flow regulating valve, 8. the large weighing box, 9. the first reversing valve, 10. the main water tank, 11. the large scale, 12. the support leg, 13. the second on-off valve, 14. the second flow meter, 15. the second flow regulating valve, 16. the third on-off valve, 17. the third flow meter, 18. the third flow regulating valve, 19. the one-way back pressure valve, 20. the drain pipe, 21. the small weighing box, 22. the second reversing valve, 23. the small scale. DETAILED DESCRIPTION

[0015] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0016] like Figures 1-2 As shown, the water return part of the water meter calibration device of the utility model includes a front water return pipe 4 and three water return branches connected in parallel, namely, a first water return branch 1, a second water return branch 2 and a third water return branch 3. The inlet of the front water return pipe 4 is connected to the outlet of the water meter in series with the detection part, and the inlets of the first water return branch 1, the second water return branch 2 and the third water return branch 3 are all connected to the front water return pipe 4.

[0017] The first water return branch 1 is used to calibrate the common flow rate, and it is sequentially provided with a first on-off valve 5, a first flow meter 6 and a first flow regulating valve 7. The outlet of the first water return branch 1 is connected to a large weighing box 8. Specifically, a first reversing valve 9 is provided at the outlet of the first water return branch 1, and two valve ports of the first reversing valve 9 are respectively connected to the large weighing box 8 or the main water tank 10; the main controller controls the first water return branch 1 to drain water to the large weighing box 8 or the main water tank 10 through the first reversing valve 9. The large weighing box 8 is located on the large scale 11, that is, the large weighing box 8 is provided with four legs 12, and the large weighing box 8 is suspended on the large scale 11 through the four legs 12. A calibration space for placing weights is formed below the large weighing box 8. The large weighing box 8 is connected to the main water tank 10 through the first rear water return pipe.

[0018] The second return water branch 2 is provided with a second on-off valve 13, a second flow meter 14 and a second flow regulating valve 15 in sequence, and the third return water branch 3 is provided with a third on-off valve 16, a third flow meter 17 and a third flow regulating valve 18 in sequence. The outlets of the second return water branch 2 and the third return water branch 3 are both connected to the inlet of a one-way back pressure valve 19, and the outlet of the one-way back pressure valve 19 is connected to a small weighing box 21 through a drain pipe 20. More specifically, a second reversing valve 22 is provided at the outlet of the drain pipe 20, and the two valve ports of the second reversing valve 22 are respectively connected to the small weighing box 21 or the large weighing box 8; the main controller controls the second return water branch 2 or the third return water branch 3 to drain water to the small weighing box 21 or the large weighing box 8 through the second reversing valve 22.

[0019] The small weighing box 21 is located on the small scale 23, that is, the small weighing box 21 is also provided with four legs 12, and the small weighing box 21 is suspended on the small scale 23 via the four legs 12. A calibration space for placing weights is also formed below the small weighing box 21. The small weighing box 21 is connected to the main water tank 10 via the second rear return pipe.

[0020] The first flowmeter 6 , the second flowmeter 14 and the third flowmeter 17 are all connected to the main controller of the water meter calibration equipment, such as a PLC chip signal, and the main controller is connected to the first reversing valve 9 and the second reversing valve 22 signal.

Claims

1. A water return part of a water meter calibration device, comprising a front water return pipe and a first water return branch, the front water return pipe is connected to the outlet of the detection part, the inlet of the first water return branch is connected to the front water return pipe, the first water return branch is sequentially provided with a first on-off valve, a first flow meter and a first flow regulating valve, the outlet of the first water return branch is connected to a large weighing box, the large weighing box is located on a large scale, and the large weighing box is connected to a main water tank via a first rear water return pipe; characterized in that: The return water part also includes a second return water branch and a third return water branch. The second return water branch is sequentially provided with a second on-off valve, a second flow meter and a second flow regulating valve, and the third return water branch is sequentially provided with a third on-off valve, a third flow meter and a third flow regulating valve; the inlets of the second return water branch and the third return water branch are both connected to the front return water pipe and the outlets are both connected to the inlet of a one-way back pressure valve, and the outlet of the one-way back pressure valve is connected to a small weighing box via a drain pipe. The small weighing box is located on a small scale, and the small weighing box is connected to the main water tank via the second rear return water pipe.

2. The water return part of the water meter calibration equipment according to claim 1, characterized in that: The large weighing box and the small weighing box are both provided with four legs, and the large weighing box and the small weighing box are suspended on the corresponding scales through the four legs, and a calibration space for placing weights is formed under the large weighing box and the small weighing box.

3. The water return unit of the water meter calibration equipment according to claim 1, characterized in that: A first reversing valve is provided at the outlet of the first return water branch, and its two valve ports are respectively connected to a large weighing box or a main water tank; a second reversing valve is provided at the outlet of the discharge pipe, and its two valve ports are respectively connected to a small weighing box or a large weighing box; the first flow meter, the second flow meter and the third flow meter are all connected to the main controller signal, and the main controller is connected to the first reversing valve and the second reversing valve signal.

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