Portable pneumatic high/medium voltage transducer checking device

Abstract

The invention discloses a portable pneumatic high / medium voltage transducer checking device. The device comprises a pneumatic booster pump, a diaphragm tank, a standard meter, a detected meter and a plurality of valve blocks, wherein an air intake valve firstly is in series with two one-way valves and then is connected with the air input end of the diaphragm tank, an air outtake valve is connected with the air input end of the diaphragm tank, the air intake valve is also connected with the air input end of the pneumatic booster pump, the oil pipe opening of the diaphragm tank is connected with the oil pipe opening of the pneumatic booster pump, the air output end of the diaphragm tank is connected with one end of a release control valve, the other end of the release control valve is connected with one connection end of a change-over valve, the air output end of the pneumatic booster pump is firstly in series with a relief pressure control valve and then is connected with second connection end of the change-over valve, the third end of the change-over valve is firstly in series with a shutoff valve and is connected with the input end of a micro-adjustable valve, and the standard meter is in parallel with the detected meter and then is connected with the input end of the micro-adjustable valve. The portable pneumatic high / medium voltage transducer checking device of the invention can easily realize the site calibration of the high / medium voltage transducer with manual pressurization operation so as to avoid the pipeline plugging, increase the durability and ensure that reverse stroke verify checking can be realized steady.

Description

technical field [0001] The invention relates to a portable calibration device for a pneumatic medium and high pressure transmitter. Background technique [0002] Medium and high pressure transmitters (2MPa~40MPa) are widely used in many occasions, such as power plants, chemical industry, energy oxygen production, etc. There are certain difficulties in the on-site calibration of medium and high pressure transmitters. The main reason is that it is difficult to manually establish medium and high pressures. In the past, the piston pressure calibrator was moved to the site for calibration, which was very time-consuming and labor-intensive. Piston pressure The calibrator is an experimental instrument, and it is difficult to guarantee the accuracy of the instrument when used on site. Therefore, the medium and high voltage transmitter is dismantled back to the laboratory for calibration, and then reassembled. This also has a very time-consuming and labor-intensive problem. [0003]...

AI Technical Summary

Problems solved by technology

[0005] It is mainly reflected in the fact that the manual pressure cannot be fully increased to greater than 1.5MPa, and when the pressure is greater than 1.5MPa, the hand feels difficult

Both the gas cylinder type and the pliers type have this defect, and the characteristic is that the pneumatic type pressure creation cannot meet the range range of the medium and high pressure transmitter (2MPa-40MPa) calibration

Secondly, the internal pipeline is narrow, with an aperture of ￠1mm~￠3mm. Since there are sundries in the process pipeline of the meter to be checked, the sundries are easy to be sucked into the pipeline of the calibrator during calibration and cause blockage.

[0006] The reverse stroke calibration is carried out by releasing the pressure through the release valve. At present, only a single pressure release valve is used to release the pressure, and it is directly connected to the atmosphere. The gas pressure release valve has defects in the control of the reverse stroke calibration, and the pressure release speed control depends on the experience of the operator.

[0007] Most of the products currently in use have a certain amount of leakage after several times of use. The higher the pressure, the greater the leakage. The main reason is that there are defects in the seals of the pressurizing piston, fine-tuning piston, and release valve. The pressurizing piston and fine-tuning piston basically adopt single Layer "O" ring seal, in addition, when the external extension of the piston rod is worn or the pores are enlarged, the angle between the internal piston and the horizontal line of the inner wall of the piston cylinder will easily lead to leakage when artificially pressurized

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