Differential pressure self-adaptive metering section of differential pressure type flowmeter

Abstract

The invention provides a differential pressure self-adaptive metering section of a differential pressure type flowmeter. The differential pressure self-adaptive metering section comprises a shell, a guiding device, a spindle-shaped throttling body, a high-pressure measuring opening, a low-pressure measuring opening and an elastic device. The whole shell is in a circular tube shape, the spindle-shaped throttling body is arranged in the shell and coaxially installed with the shell, the elastic device is installed at the tail of the spindle-shaped throttling body, the guiding device is integrallyintegrated on the inner surface of the shell, and the high-pressure measuring opening and the low-pressure measuring opening are formed in the positions, opposite to the front portion and the middleportion of the spindle-shaped throttling body, of the outer surface of the shell respectively. According to the invention, the on-way pressure loss is inversely proportional to the length of the flowchannel, and the pressure difference of the throttling element is positively related to the flow; and thus the differential pressure-flow relation curve meets the mathematical convex or linear function relation. The pressure difference is large when the flow is small, the pressure difference is small when the flow is large to guarantee that differential pressure-flow meets one-to-one mapping, andlow-pressure-loss, large-range-ratio and high-precision flow metering can be achieved.

Description

Technical field [0001] The present invention relates to a pressure adaptive differential pressure flowmeter metering section, belonging to the technical field flow measurement apparatus. Background technique [0002] Flowmeter is an important instrument of industrial measurement, it is widely used in chemical, petroleum, nuclear energy, metallurgy, electric power, electronics, transportation, textile, food, etc., is the development of industrial and agricultural production, energy conservation, improve product quality, enhance economic efficiency and management level of an important tool, it plays an important role in the national economy. To accommodate a variety of uses, types of flowmeters have been published. [0003] The measurement principle is divided into flow meter differential pressure flow meter, rotameter, turbine flow meters, positive displacement flowmeter, electromagnetic flowmeter, an ultrasonic flowmeter. In which the differential pressure flow meter is based on ...

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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