Today, I will introduce a national invention authorized patent-ultrasonic water meter flow calibration standard device. The patent was applied for by Jiang Yuewei, and the authorization was announced on August 31, 2018. The invention relates to a flow verification standard device, in particular to an ultrasonic water meter flow verification standard device. The flow calibration standard device is a standard test bench used for flow meter verification and calibration. Its accuracy and stability affect the measurement accuracy of the produced flow meter to a large extent. It is a high-precision and stable flow calibration standard. The device can not only provide reliable technical basis for manufacturers, quality supervision departments and measurement technical institutions, but the more long-term goal is to provide accurate and unified measurement standards for the introduction of intelligent flowmeters in my country in the future. In the prior art, the ultrasonic water meter flow verification device usually adopts a manual adjustment valve or an automatic adjustment valve to adjust the flow rate of the ultrasonic water meter to be verified, so as to test its measurement accuracy at different flow values. Among them, manual control valves usually use single or multiple throttle valves. The flow adjustment process is slow and complicated, with large flow fluctuations, poor stability and cannot be automatically adjusted, while the existing automatic control valves use closed-loop feedback to adjust the valve opening. , Its feedback signal is susceptible to interference from the use environment, and it is easy to cause sudden fluctuations in traffic. In order to solve the above technical problems, the purpose of the present invention is to provide an ultrasonic water meter flow rate verification standard device, which can achieve the purpose of accurately and stably adjusting the flow rate in multiple gears. In order to achieve the above purpose, the technical solution of the present invention is: an ultrasonic water meter flow verification standard device, including a constant pressure water supply system, a standard volume device and an ultrasonic water meter detection platform constituted by a ring system, and also includes multiple gears for adjusting the system flow Position fixed-point flow adjustment device. Preferably, the multi-gear fixed-point flow regulating device includes a venturi nozzle and a solenoid valve. The standard volume device is a volume tank, the constant pressure water supply system, the ultrasonic water meter detection platform and the volume tank are connected in an annular shape in sequence, and the multi-position fixed-point flow adjustment device is arranged between the ultrasonic water meter detection platform and the volume tank. The standard volume device is a ring-shaped volume tube, the constant pressure water supply system, the ring-shaped volume tube, and the ultrasonic water meter detection platform are connected in a ring shape in sequence, and the multi-position fixed-point flow adjustment device is set between the ultrasonic water meter detection platform and the constant pressure water supply system. between. The annular volume tube includes a pneumatic ball valve, a pneumatic three-way ball valve, a pneumatic four-way ball valve, a receiving and dispatching ball tube, a quick opening blind plate, an elastic ball displacer, a standard pipe section and a detection switch, and two water inlets and outlets of the pneumatic four-way ball valve , The two receiving and sending ball cylinders are respectively connected, the other two water inlets and outlets of the pneumatic four-way ball valve are respectively connected with the pneumatic ball valve, the detection switch is fixed on the standard pipe section, and the elastic ball displacer is placed in the In the transmitting and receiving ball tube, the transmitting and receiving ball tube is connected with the standard pipe section. The ultrasonic water meter test bench includes a pneumatic ball valve, a cylinder group, a water meter fixture, an ultrasonic water meter, and a guide rail. The pneumatic ball valve is connected to the cylinder group, the pneumatic ball valve is connected to the annular volume tube, and the cylinder is used to push The water meter clamp, the water meter clamp moves on the guide rail, the ultrasonic water meter is placed on the water meter clamp, and the other end of the water meter clamp is connected to the multi-position fixed-point flow regulating device through the pneumatic ball valve . The constant pressure water supply system includes a water tank, a water pump, and a surge tank. The number of the water pumps is two. The water tank is connected to the two water pumps through manual ball valves, and the two water pumps are respectively connected to two check valves. And then connected with the surge tank. The model of the two water pumps is specifically determined according to the flow rate to be measured. The beneficial effects of the present invention are: 1) In the ultrasonic water meter verification standard device, a multi-position fixed-point flow adjustment device composed of a venturi nozzle and a solenoid valve is used to replace the traditional manual or automatic valve to quantitatively control the verification standard device and the ultrasonic water meter. The amount of traffic. The different calibers of the venturi nozzle correspond to different flow rates, and can play a role of fixing the flow rate when the pressure is stable, and the solenoid valve can control the water flow. According to the verification requirements of the ultrasonic water meter, by setting the corresponding flow channel, the fixed-point flow can be accurately adjusted, and then the flow can be superimposed through the electromagnetic switch valve group, so that the multiple gears can be accurately and stably adjusted to the required flow point; 2) The use of an annular volume tube to calibrate the ultrasonic water meter in the ultrasonic water meter verification standard device can not only ensure the high measurement accuracy of the flow verification standard device of the present invention, but the key lies in: Compared with the standard volume tank and the electronic scale device, the annular volume tube The standard pipe section is internally processed and polished, and has the characteristics of corrosion resistance and wear resistance, high stability and less impact by environmental changes. 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