Water pressure output part of water meter verification equipment

Abstract

The utility model discloses a water pressure output part of water meter verification equipment, which comprises a main water tank and two pressure transmission branches connected in parallel, the first branch comprises a first pump, a first surge tank and a first stop valve, the second branch comprises a second pump, a second surge tank and a second stop valve, and the first pump and the second pump are both communicated with the main water tank; the water pressure output part further comprises a third branch which is connected in parallel, the third branch comprises a water supplementing pipe, a water tower and a water supply pipe, the water supplementing pipe communicates with the main water tank and the water tower and is provided with a third pump, the water tower is provided with an overflow pipe used for discharging water exceeding the high water level to the main water tank, and the water supply pipe is provided with a third stop valve; outlets of the first stop valve, the second stop valve and the third stop valve are jointly communicated with a gas eliminating tank, and a one-way exhaust pipe is arranged at the top end of the gas eliminating tank. The water pressure output part can eliminate the adverse effect of the pump machine on the measurement precision as much as possible, is reasonable in layout, and can provide an ideal mode which is not interfered by the pump machine for water meter measurement.

Description

Technical Field

[0001] The utility model relates to the field of water meter detection and verification, in particular to a water pressure output 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] The present application is concerned with the water pressure output part. 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 significantly 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, a single pump obviously cannot output stably over a large span, therefore, two pumps, one large and one small, and two parallel pressure transmission branches are required, and a shut-off valve and a pressure-stabilizing tank are set on each branch. However, the water pumped to the test bench by the hydraulic output unit is greatly affected by the pulsation of the pump, and there are more bubbles, which will reduce the measurement accuracy of the water meter. However, the existing technology for eliminating the influence of the pump is relatively simple in structure, the layout is unreasonable and unscientific, and the effect is not ideal; furthermore, the water medium of the existing equipment is impure and inevitably contains impurities, which will further reduce the accuracy of the water meter measurement; moreover, even if the structure and measures to eliminate the adverse effects of the pump are adopted, there is a lack of reference for judging the actual effect. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a water pressure output part of a water meter calibration device which can eliminate the adverse effect of a pump on measurement accuracy as much as possible, has a reasonable layout, and can also provide an ideal mode for water meter measurement without being disturbed by the pump.

[0005] The technical solution of the utility model is to provide a water pressure output part of a water meter calibration device, which includes a main water tank and two parallel pressure transmission branches, the first branch includes a first pump, a first pressure-stabilizing tank and a first stop valve, the second branch includes a second pump, a second pressure-stabilizing tank and a second stop valve, and the first pump and the second pump are both connected to the main water tank; the water pressure output part also includes a third branch in parallel, the third branch includes a water replenishment pipe, a water tower and a water supply pipe, the water replenishment pipe connects the main water tank and the water tower, the water replenishment pipe is provided with a third pump, the water tower is provided with an overflow pipe for discharging water exceeding the high water level line to the main water tank, and the water supply pipe is provided with a third stop valve; the outlets of the first stop valve, the second stop valve and the third stop valve are commonly connected to an air remover, and a one-way exhaust pipe is provided at the top of the air remover.

[0006] Compared with the prior art, the shaft insertion device using the above structure has the following advantages.

[0007] Firstly, the first and second branches provide two kinds of water pressure respectively. Opening only one of them can meet the measurement requirements of large flow points or small and medium flow points in normal mode. Moreover, each branch must pass through the air remover to enter the water meter of the measuring part. In other words, each branch passes through the pressure-stabilizing tank to eliminate the pulsation of the pump body, and then passes through the air remover to eliminate bubbles. In this way, the adverse effects of the pump on the water meter detection can be reduced or eliminated as much as possible, thereby improving the detection accuracy.

[0008] Moreover, it is well known in the industry that pump pulsation can easily cause adverse effects on the measurement of small and medium flow points but has little effect on large flow, so a third branch with a water tower is added in a targeted manner. Water is replenished through the third pump and excess water is discharged through the overflow pipe, so that the water level and water pressure of the water tower are stable within the standard range, thereby providing an ideal mode for the measurement of water meters at small and medium flow points that is not disturbed by pump pulsation; the measured values ​​under the ideal mode are used to make an intuitive comparison with the measured values ​​of the same model water meter under the normal mode, that is, when the second branch is opened alone at small and medium flow points. If it is found that the normal measured value under the second branch is opened alone is not much different from the ideal measured value under the third branch, it means that the calibration measures are appropriate, but if it is found that the normal measured value and the ideal measured value are far apart, it means that the current damping and exhaust effect is not good, and the pump pulsation has a significant adverse effect on the detection process. Further measures need to be taken, such as improving the volume and structure of the pressure stabilizing tank or the air eliminator, or improving the internal structure of the water meter to eliminate the adverse effects. In other words, the third branch provides an ideal mode without interference, which serves as a reference and basis for judging the voltage stabilization and shock absorption effect.

[0009] Furthermore, the three branches mentioned above are connected by sharing the same degassing tank, and only one component is used to achieve degassing and voltage stabilization of the three branches, with a simple structure and reasonable layout.

[0010] Preferably, an L-shaped transition water tank is provided on the side of the main water tank, and multiple layers of inclined filter screens are provided in the transition water tank; the main water tank is divided into a front chamber and a rear chamber by a partition, the inlet of the transition water tank is connected with the front chamber and the outlet is connected with the rear chamber; the inlet of the water supply pipe is connected with the transition water tank, the outlet of the overflow pipe is connected with the front chamber, and the first pump and the second pump are both connected with the rear chamber; in this way, water circulates through the front chamber, the transition water tank and the rear chamber to ensure that the water entering each branch has undergone a complete process of filtering and removing impurities, thereby improving the purity of the medium and avoiding the adverse effects of impurities on water meter measurement; moreover, before entering the three branches, the water has experienced pre-shock absorption and flow stabilization of multiple layers of filter screens, further improving the stability of the water flow and further reducing the adverse effects of pump pulsation on detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 The utility model is a schematic diagram of the structure of the water pressure output part of the water meter calibration equipment.

[0012] Figure 2 yes Figure 1 Schematic diagram of the structure after deflection at a certain angle.

[0013] Figure 3 yes Figure 2 Schematic diagram of the structure after deflection at a certain angle.

[0014] Figure 4 The utility model is a schematic diagram of the structure of a water tank of a water pressure output part of a water meter calibration device.

[0015] As shown in the figure, 1. main water tank, 1.1. front chamber, 1.2. rear chamber, 2. transition water tank, 3. filter screen, 4. partition, 5. first pump, 6. first pressure-stabilizing tank, 7. first stop valve, 8. second pump, 9. second pressure-stabilizing tank, 10. second stop valve, 11. water supply pipe, 12. water tower, 13. water supply pipe, 14. third pump, 15. overflow pipe, 16. third stop valve, 17. degassing tank. DETAILED DESCRIPTION

[0016] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0017] like Figures 1 to 4 As shown, the water pressure output part of the water meter calibration equipment of the utility model includes a main water tank 1, two normal pressure transmission branches and an ideal pressure transmission branch, the normal branches refer to the first branch and the second branch, the ideal branch refers to the third branch, and the three branches are connected in parallel.

[0018] An L-shaped transition water tank 2 is provided on the side of the main water tank 1, and a multi-layer inclined filter screen 3 is provided inside the transition water tank 2; the main water tank 1 is divided into a front chamber 1.1 and a rear chamber 1.2 by a partition 4, and the inlet of the transition water tank 2 is connected to the front chamber 1.1 and the outlet is connected to the rear chamber 1.2; in this way, water flows through the front chamber 1.1, the transition water tank 2 and the rear chamber 1.2 in sequence to filter, remove impurities and reduce shock.

[0019] The first branch includes a first pump 5, a first pressure-stabilizing tank 6 and a first stop valve 7, and the second branch includes a second pump 8, a second pressure-stabilizing tank 9 and a second stop valve 10. The first pump 5 and the second pump 8 are both connected to the main water tank 1. In this embodiment, the first pump 5 is for common flow rate pressure transmission, with high power, 45kw; the second pump 8 is for boundary flow rate and minimum flow rate pressure transmission, with low power, 4kw. The volume of the first pressure-stabilizing tank 6 is significantly larger than that of the second pressure-stabilizing tank 9. In this embodiment, the inlets of the first pump 5 and the second pump 8 are both connected to the rear chamber 1.2 to ensure that the water entering the two branches is fully filtered.

[0020] The third branch includes a water supply pipe 11, a water tower 12 and a water supply pipe 13; the inlet of the water supply pipe 11 is connected to the main water tank 1, more precisely, it is connected to the rear end of the transition water tank 2, and the outlet of the water supply pipe 11 is connected to the water tower 12. The water supply pipe 11 is provided with a third pump 14. The water tower 12 is provided with an overflow pipe 15 for discharging water exceeding the high water level to the main water tank 1, and the outlet of the overflow pipe 15 is connected to the front chamber 1.1 of the main water tank 1. In this way, the water level of the water tower 12 is stabilized between the high water level and the low water level. A liquid level sensor is provided in the water tower 12 to send liquid level information to the main controller in real time. If there is too much, the third pump 14 will be turned on to replenish water if there is less overflow. The inlet of the water supply pipe 13 is connected to the water tower 12, and the water supply pipe 13 is provided with a third stop valve 16. The outlets of the first stop valve 7, the second stop valve 10 and the third stop valve 16 are connected to a degassing tank 17. A one-way exhaust pipe is provided at the top of the degassing tank 17, that is, the exhaust pipe is provided with a one-way valve. The water in the three branches is separated into gas and liquid in the degassing tank 17 before entering the detection unit. The gas continuously accumulates at the upper part of the degassing tank 17 to increase the air pressure. When the air pressure in the degassing tank 17 is greater than the set value, the air is exhausted to the outside through the exhaust pipe.

Claims

1. A water pressure output part of a water meter calibration device, comprising a main water tank and two parallel pressure transmission branches, the first branch comprising a first pump, a first pressure stabilizing tank and a first stop valve, the second branch comprising a second pump, a second pressure stabilizing tank and a second stop valve, the first pump and the second pump are both connected to the main water tank; characterized in that: The water pressure output part also includes a third branch in parallel, which includes a water supply pipe, a water tower and a water supply pipe. The water supply pipe is connected to the main water tank and the water tower. The water supply pipe is provided with a third pump. The water tower is provided with an overflow pipe for discharging water exceeding the high water level line to the main water tank. The water supply pipe is provided with a third stop valve. The outlets of the first stop valve, the second stop valve and the third stop valve are connected to a degassing tank, and a one-way exhaust pipe is provided at the top of the degassing tank.

2. The water pressure output unit of the water meter calibration equipment according to claim 1, characterized in that: An L-shaped transition water tank is provided on the side of the main water tank, and multiple layers of inclined filters are provided in the transition water tank; the main water tank is divided into a front chamber and a rear chamber by a partition, the inlet of the transition water tank is connected with the front chamber and the outlet is connected with the rear chamber; the inlet of the water supply pipe is connected with the transition water tank, the outlet of the overflow pipe is connected with the front chamber, and the first pump and the second pump are both connected with the rear chamber.

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