Movable throttling element flowmeter with through hole at middle part

Abstract

The invention relates to a movable throttling element flowmeter with a through hole at the middle part, which belongs to the technical field of automatic detection. At present, flow measurement whichis implemented by utilizing the throttling principle widely adopts a fixed throttling element, and a movable throttling element used in a target type flowmeter or a rotor flowmeter does not have the through hole at the middle part. The movable throttling element flowmeter with the through hole at the middle part comprises three parts: the movable throttling element, a force transformation mechanism and a transmitter, wherein, the movable throttling element has the through hole at the middle part, two elastic sealing ring bands are arranged at the front end and the back end of the movable throttling element, and the movable throttling element is further provided with a balancing chamber for balancing the side pressure of measured fluid of the elastic sealing ring bands, so that a non-leakage fluid flowing channel is formed between an inlet and an outlet of the flowmeter under the situation of allowing the movable throttling element to carry out axial movement along a pipeline; and the movable throttling element flowmeter does not need a pressure pipe and can reduce the construction difficulty of a flow detection system, particularly, when the movable throttling element selects a Venturi tube, the movable throttling element flowmeter further has the advantages of small flow resistance loss, long service life, capability of measuring flow rate of small pipe diameter and dirty fluid and the like.

Description

technical field [0001] The invention relates to an instrument for realizing flow detection in the technical field of automatic detection. Background technique [0002] At present, flow measurement using the throttling principle is the most widely used. Most of the throttling devices used are fixed throttling elements, and a small part are dynamic throttling elements. Among flowmeters made using the throttling principle, differential pressure flowmeters use fixed throttling elements, while target flowmeters and rotameters use dynamic throttling elements. Commonly used fixed throttling elements include orifice plates, nozzles and venturi tubes. They have a long history of use, complete test data, and standardized products, so they are also called "standard throttling devices". In the measurement, the orifice plate, nozzle and Venturi tube are fixedly installed in the pipeline, and the fluid flows through the through hole in the middle of them; the dynamic throttling element o...

AI Technical Summary

Problems solved by technology

There is a pressure guide tube between the fixed throttling element and the differential pressure meter, which is not suitable for measuring dirty media; the rotameter is generally only used in the laboratory environment, while the disc target of the target flowmeter is suspended in the center of the pipeline, and the dirty It is not easy to gather substances, so it can measure dirty media, but it is not suitable for measuring small diameter flow

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