Variable area type differential pressure flowmeter adopting variable area type differential pressure flow structure

Abstract

The invention discloses a variable area type differential pressure flowmeter adopting a variable area type differential pressure flow structure. The flow structure comprises a fixed sleeve, a channel which is used for connecting a fluid pipeline is arranged in the middle of the fixed sleeve, at least one blade of positioning wheel plate is stretched from an inner wall of the middle of the channelfrom the top down, a threaded rod coaxial with the channel is fixed on a hanging end of the positioning wheel plate, a throttling slip mass which slidably matched with the threaded rod in an coaxial manner is sheathed in the middle of the threaded rod, a compression spring is sheathed on the threaded rod between a rear end of the throttling slip mass and a limit step, the throttling slip mass comprises a section of a spindle structure, and a pressure tapping holeI and a pressure tapping holeII are respectively arranged on the fixed sleeve. Due to the adoption of the flowmeter, therefore, limitation that a traditional differential pressure type flowmeter has a fixedly invariant throttling area ratio and an invariant measurement range can be broken down, during measurement process, throttling area can be changed along with flow change, a meter signal (differential pressure) is in linear relationship with flow, measuring range altitude intercept can be greatly improved, and measurement requirements for different flow ranges can be met.

Description

technical field [0001] The invention relates to the technical field of fluid flow measurement, in particular to a variable-area differential pressure flow structure, and also to a variable-area differential pressure flowmeter. Background technique [0002] Traditional differential pressure flowmeters are represented by orifice flowmeters, Venturi tube flowmeters and nozzle flowmeters, which have a long history of use, simple structure, reliable performance, low price, and wide applicability. It is widely used in industrial production such as metallurgy and metallurgy. Since the instrument signal (differential pressure) of this type of flowmeter is in a square relationship with the flow rate, its measurement range is only 3:1 to 4:1, and the permanent pressure loss is large. After many years of practice, this problem has not been completely resolved. [0003] The mathematical model of traditional differential pressure flowmeter can be expressed as: [0004] [0005] ...

AI Technical Summary

Problems solved by technology

Therefore, generally speaking, the turndown ratio of the orifice flowmeter is limited to about 4:1.

And the permanent pressure loss is large

After years of practice, this problem has not been completely resolved

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