Electric digital micromanometer

Abstract

The invention relates to an electric digital micromanometer comprising a shell as well as a micro-pressure compensator screw rod and a pressure generator which are arranged in the shell, the pressure generator comprises a water valve provided with a static-pressure air tap and a water storage tank connected with a dynamic-pressure air tap through a pipeline, and the water valve is arranged on the micro-pressure compensator screw rod and is connected with the water storage tank through a flexible pipe. The electric digital micromanometer also comprises an electric lifting device and an MCU (Microprogrammed Control Unit) master control board, wherein the electric lifting device comprises a stepping motor, a small driving wheel, a large driving wheel and a driving belt, the stepping motor is arranged at the top end in the shell, the small driving wheel is fixed on a rotary shaft of the stepping motor, the large driving wheel is fixed at the top end of the micro-pressure compensator screw rod, and the driving belt is used for horizontally driving and connecting the small driving wheel and the large driving wheel; and the MCU master control board is provided with a stepping motor driving module and can drive the stepping motor to run, wherein the stepping motor driving module is controlled by an MCU and is electrically connected with the stepping motor. The invention enables the water valve to move up and down through the driving of the electric lifting device so as to automatically form a liquid level difference for generating pressure.

Description

technical field [0001] The invention relates to an electric digital micromanometer which can be used for calibrating and verifying a dynamic pressure measuring system of pollution source sampling equipment. Background technique [0002] At present, the existing equipment used to calibrate and verify the dynamic pressure measurement system of pollution source sampling equipment is a mechanically compensated micromanometer imported from the former Soviet Union in my country, which has the characteristics of high accuracy, good repeatability, and stable pressure generation. However, the existing mechanical compensation micromanometer also has the following defects: 1) the lifting of the static pressure end (water tank) is realized by the operator manually turning the "fine-tuning dial", which requires a large amount of labor, and the operation is difficult to grasp. When using it for the first time, it is easy to knock down the compensating micromanometer, or even break it. Whe...

AI Technical Summary

Problems solved by technology

However, the existing mechanical compensation micromanometer also has the following defects: 1) the lifting of the static pressure end (water tank) is realized by the operator manually turning the "fine-tuning dial", which requires a large amount of labor, and the operation is difficult to grasp. When using it for the first time, it is easy to knock down the compensating micromanometer, or even break it. When the pressure is generated manually, if it is not properly controlled, it is easy to get stuck in the high range or low range; 2) the existing micromanometer is through the degree plate and The scale value on the fine-tuning plate is used to calculate the pressure value, which cannot be directly read; 3) The existing micro-manometer has a maximum measurement range of -2500 ~ 2500Pa, which cannot meet the new market demand; 4) The existing micro-manometer cannot measure Atmospheric pressure, temperature, humidity and other environmental parameters require additional configuration of corresponding instrumentation equipment during laboratory construction, which is inconvenient to use and increases costs

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