Water meter verification device and method

Abstract

The invention relates to a water meter verification device and method. The device comprises a power driving mechanism (1), and a piston system (2) connected with the power driving mechanism (1) and capable of reciprocating under the driving of the power driving mechanism (1), wherein the water outlet of the piston system (2) is connected with a to-be-verified water meter (4) through a water outlet valve (3); and the outlet of the to-be-verified water meter (4) is connected with a water tank (5) connected with the piston system (2) through a water inlet valve (7). The device further comprises a reading device (8), and a control device (9) connected with the power driving mechanism (1), the water outlet valve (3) and the reading device (8). Compared with the prior art, the control device drives the piston system under the driving of the power driving mechanism, so that the piston system generates a standard water flow to flow through the to-be-verified water meter, and the water flow is an actively generated standard value; and additional water pump and pressure stabilizing equipment are not required, and the water pressure is table during the whole test process.

Description

technical field [0001] The invention relates to a water meter verification device and a verification method. Background technique [0002] The small-diameter water meter measuring device is a kind of water flow standard device. Its accuracy, installation requirements of the test section and configuration of the standard device are configured according to the user's water meter. The caliber meets the water meter below DN25. Generally, the start-stop method is used. The water meter and the standard device are transcribed manually. [0003] Due to the flow range Q of domestic water meters 3 / Q 1 Generally, it can reach 100, which is much larger than ordinary flowmeters. At the same time, household water meters are mostly filled with metering performance under small flow rates. The boundary flow Q 2 and minimum flow Q 1 values ​​are relatively small. During the initial verification and factory inspection, the national metrological verification regulations and national stand...

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Problems solved by technology

[0006] 2. The verification time is long, with DN15, Q 3 =2.5,Q 3 / Q 1 =100 water meter as an example, the verification under the minimum flow rate takes at least 20 minutes, and the minimum flow rate Q 1 , Boundary flow Q 2 , common flow Q 3 The pure verification time of the three flow points is about 43 minutes; the non-verification time also takes a few minutes, this time includes installation time, circulation exhaust time, water meter start and stop reading time, and verification flow point switching time;

[0007] 3. The conventional water meter verification device uses the container voltage stabilization method or the overflow voltage stabilization method. This is a method that requires special voltage stabilization equipment. large pools or tanks;

[0008] 4. The conventional water meter verification device is manual reading of the water meter, which has low degree of automation, high labor intensity and low work efficiency;

[0009] 5. The conventional water meter verification device generally stops switching of the water meter verification point, including the exhaust; this is because the reading of the standard device needs to be read statically, so even if it is a dynamic verification, it will be stable for a period of time

[0012] The standard meter method commonly used for flowmeter calibration or verification is an effective method to improve water meter verification. The dual-time method principle used by some domestic devices improves the verification efficiency of water meters. However, due to the wide flow range of water meters, the type of standard meter Selection and stability are also difficult issues

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