Pressure gauge calibrator

Abstract

The invention discloses a pressure gauge calibrator which is formed by a hand wheel, an oil cylinder, an oil cup, a piston screw rod, a high precision pressure gauge, valves, an inflation valve and a pipeline which is connected to the oil cup, the high precision pressure gauge, a pressure gauge to be calibrated and the oil cylinder. The oil cup, the high precision pressure gauge and the pressure gauge to be calibrated are connected to the oil cylinder through the valves. The oil cup is formed by an oil cup cover and an oil cup container, the oil cup cover is at an upper part and is equipped with the inflation valve. The oil cup cover and the oil cup container are connected through thread. A sealing ring is added between the oil cup container and the oil cup cover. The maximum value of the inner diameter of the oil cup container is 1.5 to 3 times of the diameter of the oil cylinder, and the volume of the oil cup container is 1.5 to 10 times of the maximum volume of the oil cylinder. The pressure resistance of the oil cup is not smaller than 10 MPa, and compressed air filled into the oil cup is air or nitrogen.

Description

technical field [0001] The invention relates to a pressure gauge calibrator, in particular to a pressure gauge calibrator with a pressure oil cup, which belongs to experimental equipment. Background technique [0002] In industrial production and daily life, pressure plays an important role. It is an important issue to accurately measure pressure and control it. The commonly used instrument for measuring pressure is a pressure gauge. Whether the pressure gauge is accurate or not will naturally affect the control of pressure. The pressure gauge needs to meet the national standards. The pressure gauge must be inspected before leaving the factory. After a period of use, the pressure gauge must also be calibrated to ensure the accuracy of the measurement. The equipment often used for calibration is the pressure gauge. The working principle of the calibrator is to connect the pressure gauge to be calibrated with another high-precision pressure gauge on the same pressure source, a...

AI Technical Summary

Problems solved by technology

In the existing pressure gauge calibrator, rubber seals are generally used for sealing between the piston and the oil cylinder, and transformer oil or castor oil is generally used for hydraulic oil. The piston seal leaks. When using castor oil, due to the high viscosity of castor oil, oil leakage rarely occurs. However, at low temperature, the piston screw retreats. The movement speed of castor oil in the oil cup and the pipeline of the piston in the tester is very slow, forming a negative pressure and causing air leakage. When air leakage occurs, it is impossible for the piston to extract the castor oil from the oil cup, because the oil cup and The atmosphere is connected, so the pressure gauge calibrator cannot be used. When the room temperature is high and the pumping speed is slightly faster, air leakage will also occur. It is necessary to pump repeatedly to calibrate the pressure gauge, resulting in a decrease in work efficiency.

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