Product Structure of Quality Method Water Meter Verification Device

The quality method water meter verification device includes a servo motor, a shaft coupling, a lead screw, a lead screw nut, a hydraulic cylinder, a protective cover, a photoelectric sampler and a chronograph for generating laser beams corresponding to each pointer movement. Tested water meter. A frequency conversion device and a water tank; each timing and frequency counting device is correspondingly connected with a corresponding photoelectric sampler and a pulse control circuit of a servo motor. The protective cover is fixedly connected with the cylinder body of the hydraulic cylinder, the servo motor is fixed on the protective cover, the rotating shaft of the servo motor is fixedly connected with one end of the lead screw through a coupling, the other end of the lead screw is connected with the lead screw nut, and the lead screw nut is connected with the screw nut. One end of the hydraulic cylinder piston is connected.

The cylinder is provided with a cylinder water inlet and a cylinder water outlet, and the water tank is provided with a water tank water inlet and a water tank outlet. The cylinder water inlet and the water tank outlet pass through a water inlet pipe and a cylinder water outlet. Two water inlet pipes are installed at the water inlet, and a switch valve water inlet pipe, two water inlet pipes and water outlet pipes are installed above the water.

The working principle of the mass method water meter verification device is: since water is incompressible when the pressure is small, the volume of the piston horizontally entering the cylinder per unit time, that is, the volume standard of the mass method water meter verification device, is the water discharged by the volume piston, The process is complete., the volumetric displacement of water.During the horizontal movement of the piston, the running distance of the piston and the screw pitch of the lead screw in the timing start-stop time period of the timing frequency device connected to the servo motor control circuit are calculated according to the control pulse number of the servo motor, and the volume displacement model is calculated. The average flow rate of the quality method water meter verification device in the time period.When the piston moves horizontally at a constant speed, each photoelectric sampler cooperates with each measured water meter to generate a corresponding photoelectric pulse signal, which is sent to the timing and frequency counting device corresponding to each measured water meter for independent timing and frequency counting (in this process, each The timing start and end of the water detection meter are not necessarily synchronized, and the timing of the timing frequency device connected to the servo motor control circuit is not necessarily synchronized, that is, the timing and frequency The device connected to the servo motor control circuit and all water meters use independent time bases for timing. This timing method is called 'independent time base composite timing method'), according to the time and frequency results of the timing, the frequency device corresponding to each measured water meter calculates the average value of each measured water meter.At the same time, according to the timing frequency result of the timing frequency device connected to the servo motor control circuit, the average flow rate of the mass method water meter verification device is calculated; the average flow rate of each measured water meter is compared with the average flow rate of the mass method water meter verification device.Indication error of the measured water meter.

Compared with the prior art, the beneficial effect of the utility model is: the utility model not only provides a new type of piston-type mass method water meter verification device for water meter verification, but also adopts 'independent time base composite time' regular The time method 'combined with the piston standard. Realize the serial verification of multiple water meters under test; more importantly, by adopting the 'independent time base compound time timing method', the piston standard and each water meter under test are realized. Independent timing frequency and instantaneous volume flow. Obtained, shortened the verification time of the water meter under test, overturned the traditional start-stop method to compare the cumulative volume flow of the water meter under test, and reduced the inconvenience caused by start-stop and the reading of the water meter under test The deterministic water meter greatly improves the measurement accuracy and work efficiency of the quality method water meter verification device.