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Views: 5 Author: Site Editor Publish Time: 2022-01-17 Origin: Site
Piston-type water meter testing device-water meter test bench
Overview
The liquid flow standard device is widely used in the experiment and verification device of liquid flow meter, especially for flow meter manufacturers, there are a large number of instrument verification work and product development experimental work, and a set of efficient and reliable liquid flow standard device is produced. Activities are important.
In industrial applications, the flow standard device should not only have sufficient accuracy and reliability, but also have a relatively high verification efficiency. Factors such as the construction cost of the device, the operating cost, and the technical requirements of the operator should also be considered. Most of the traditional liquid flow standard devices are based on the mass method and the volume method.
The generation of the flow source relies on the water pump to provide the flow, but the flow is pulsating, the flow stability is poor, and the flow point adjustment is not accurate. With the rapid development of these devices, these devices can no longer meet the requirements. In order to meet the requirements of liquid flowmeter verification, calibration, factory inspection and the growing trend of new flowmeter production, our company has designed and manufactured an active piston liquid flow standard device with water as the medium.
The standard device has a unique design and its basic working principle It is to compare the volume flow of the fluid discharged by the piston with the volume flow of the flowmeter under test in a certain time interval. The volume of the fluid discharged by the piston is obtained by the product of the cross-sectional area of the piston cylinder and the displacement of the piston.
Driven by the servo motor to reduce the disturbance to the liquid flow, it has many advantages such as stability and reliability, good repeatability, high degree of automation, and easy operation, avoiding the shortcomings of the start-stop effect or the commutator effect of the traditional liquid flow standard device.
It is beneficial to improve the measurement uncertainty level. The device also has the characteristics of self-contained, compact structure, high efficiency and energy saving, no need to build a pool, no need to put forward special structural requirements for buildings, and is very suitable for production testing and product development testing of small flow metering instruments.
Technical indicators
1. Device uncertainty: ≤0.2%(k=2) Flow stability ≤0.2%;
2. The working pressure of the device: 0-1MPa;
3. The working temperature of the device: 5-85℃;
4. The number of inspection meters: ultrasonic or ordinary water meter DN15: 10 only DN20: 10 only DN25: 8 only, the other
Other instruments calculate the number of clamps according to the length of the pipe; 5. Communication interface: M-BUS, RS485;
6. Control system: Siemens PLC, industrial control touch screen; 7. The verification process is automated, with visual interface control, automatic data storage, and report generation
into an equal function.
Device composition
1. Piston composition
The active piston liquid flow standard device is shown in Figure 1, which is mainly composed of a frame, a piston rod, a piston cylinder, a motor, a ball screw, a supporting optical axis, a sensor, and a protective casing.
The piston rod is in close contact with the piston cylinder through the Y-shaped sealing ring, and the three together form a sealed cavity. The movement of the piston rod is realized by the servo motor, coupling, ball screw, supporting optical axis, etc. The rod is connected by a screw nut, and the movement direction is controlled by a servo motor and a ball screw. A water suction pneumatic valve and a drainage pneumatic valve are installed at the outlet of the piston cylinder. Install high-precision temperature and pressure sensors.
2. Hardware characteristics of the control system
The control system is mainly composed of industrial computer, PLC control system, servo motor, grating ruler, various temperature and pressure sensors, pneumatic ball valve, platform software, etc. The industrial computer has strong anti-interference, which can make the verification process more stable and reliable; the PLC and servo motors are internationally renowned brands with high precision and high reliability, and the control and data processing software are written in accordance with the relevant national verification regulations.
