Differential pressure adaptive metering section of a differential pressure flowmeter

Abstract

The present invention proposes a differential pressure self-adaptive metering section of a differential pressure flowmeter, which includes a housing, a guiding device, a spindle-shaped throttling body, a high-pressure measuring port, a low-pressure measuring port and an elastic device; wherein the housing as a whole is a round tube The spindle-shaped throttling body is placed inside the shell and installed coaxially with the shell, the elastic device is installed at the tail of the spindle-shaped throttling body, the guiding device is integrated into the inner surface of the shell, the high-pressure measuring port and the low-pressure measuring port They are respectively arranged at the front and middle positions of the outer surface of the housing relative to the spindle-shaped throttling body. The present invention makes use of the relationship that the pressure loss along the process is inversely proportional to the length of the flow channel, and the pressure difference of the throttling member is positively correlated with the flow rate, so that the pressure difference-flow rate relationship curve satisfies a mathematical convex or linear functional relationship, and the pressure difference is relatively small when the flow rate is small. The pressure difference is small when the flow rate is large, and the pressure difference-flow rate is guaranteed to meet one-to-one mapping, which can realize flow measurement with low pressure drop, large range ratio and high precision.

Description

technical field [0001] The invention relates to a differential pressure adaptive metering section of a differential pressure flowmeter, and belongs to the technical field of flow measurement equipment. Background technique [0002] Flowmeter is one of the important instruments in industrial measurement. It is widely used in chemical industry, petroleum, nuclear energy, metallurgy, electric power, electronics, transportation, textile, food and other fields. Quality, an important tool to improve economic efficiency and management level, occupies an important position in the national economy. In order to adapt to various purposes, various types of flowmeters have come out one after another. [0003] According to the measurement principle, flowmeters are mainly divided into differential pressure flowmeters, rotameters, turbine flowmeters, volume flowmeters, electromagnetic flowmeters, ultrasonic flowmeters, etc. Among them, the differential pressure flowmeter is based on the p...

AI Technical Summary

Problems solved by technology

However, the solution it adopts is to measure the flow from two flow channels. When the flow is small, the orifice plate is used to throttle the flow. When the flow is large, a special valve that automatically opens when the flow is large is used to achieve the throttling. The throttling device is not used. integration

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