Gas circuit assembly and gas pressure calibrator

Abstract

The invention provides a gas circuit assembly and a gas pressure calibrator. The calibrator comprises a shell, and a gas circuit assembly and a circuit part which are assembled in the shell in a modular manner, the gas circuit assembly comprises a gas pressure control mechanism and a micro gas pressure generating mechanism, the gas pressure control mechanism provides required pressure gas for a detected pressure instrument, and comprises an interface module realizing air channel connection in a plug-in mode, a control execution module and a control module for controlling the interface module and the control execution module, the miniature gas pressure generating mechanism provides positive pressure gas and negative pressure gas for the gas pressure control mechanism and comprises a miniature piston type gas pump serving as the pressure source. The modular design is adopted, all the gas circuit assemblies are assembled in a push-pull mode, and installation and maintenance are convenient; the circuit components are installed in a plug-in mode, the vertical space is fully utilized, and light weight design is adopted so that the whole structure is compact, the size is small, the weightis light, and the calibrator is suitable for on-site verification.

Description

technical field [0001] The invention belongs to the technical field of gas pressure calibration, and in particular relates to a gas circuit assembly and a gas pressure calibrator. Background technique [0002] At present, in the field of gas pressure calibration, portable gas pressure calibrators for on-site calibration of pressure instruments to be tested are widely used. In the existing gas pressure calibrator, the gas pressure control device that provides a stable standard pressure output, the valve seat is usually fixed on the fixed frame, and the gas circuit is connected through the connecting pipeline between the valve seats, which is not universal, and maintenance, It is inconvenient to replace the device. [0003] The interface part of the existing gas pressure control module is equipped with measurement components. Different measurement and precision gas pressures require different detection modules, and then configure different interface parts to match them. The a...

AI Technical Summary

Problems solved by technology

In the existing gas pressure calibrator, the gas pressure control device that provides a stable standard pressure output, the valve seat is usually fixed on the fixed frame, and the gas circuit is connected through the connecting pipeline between the valve seats, which is not universal, and maintenance, Inconvenient to replace parts

[0003] The interface part of the existing gas pressure control module is equipped with measurement components. Gas pressures with different measurement and precision need to be equipped with different detection modules, and then configure different interface parts to match them. The adaptability is poor, the cost is high, and it is difficult to maintain.

The existing gas-liquid separation methods generally can only isolate the impurities entering the tested pressure instrument, and cannot remove the water vapor in the input gas, and cannot realize the dehumidification function

[0004] For the piston type air pump used in the existing gas pressure calibrator, the motor and the cylinder are usually arranged in series, and the piston needs to be replaced frequently as a wear part. When replacing, the motor and the cylinder must be dismantled as a whole, which is difficult to replace; The existing air pump itself does not include a vibration damping system, and is generally fixed with an external vibration damping pad and the body of the detection system. When the pressure output of the air pump is low pressure, a hose is usually used to output low pressure gas, which can effectively isolate the vibration of the air pump; For high pressure output, steel pipes must be used to output high-pressure gas to ensure safety. The steel pipes are rigidly connected. The vibration of the pump body of the air pump will be transmitted to the body of the detection system through the steel pipes, making the vibration reduction system invalid.

As the pressure generating device (providing pressure gas source) of the pressure calibrator, large vibration will affect the detection accuracy of the sensor; at the same time, in order to meet the use requirements of portable equipment, the volume and weight of the gas pressure generating device meet the miniaturization requirements as much as possible. Existing gas pressure generating devices cannot meet the above requirements

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