Dual-rotor mechanical flow sensor and operating method thereof

Abstract

The invention relates to a dual-rotor mechanical flow sensor. The dual-rotor mechanical flow sensor is characterized in that an impeller thereof adopts a dual-rotor impeller and comprises a main rotor, an auxiliary rotor, an impeller body, an impeller shaft and a sensing element; the operating method comprises the following steps: the dual-rotor impeller is pushed to rotate by fluid; the main rotor is used for transforming the rotation of the impeller at the instantaneous velocity of the fluid passing through a measuring room; the auxiliary rotor generates a downward propelling axial force under the action of axial force of the fluid; a counterforce upwardly pointing to a cavity at the top of the measuring room is reacted on the fluid when the dual-rotor impeller rotates, so that a part offluid is extruded and the residual air at the top of the measuring room is discharged; and the fluid flows out of a water outlet opening through the measuring room to finish measurement. The invention has the advantages that the air at the top of the measuring room can be evacuated to generate turbulent flow favorable for the flow characteristic, thereby improving the flow characteristic of the flowmeter; and a trend of downward movement is provided for the auxiliary rotor under the action of axial force of the fluid by using the dual-rotor technology so that the impeller works basically at the lowest axial position.

Description

(1) Technical field: [0001] The invention relates to a mechanical flow sensor and a working method thereof, in particular to a double-rotor mechanical flow sensor and a working method thereof which are suitable for the application occasion of a heat meter for central heating charging and metering. (2) Technical background: [0002] With the rapid development of my country's national economy, the demand for resources is increasing, especially water resources and oil resources. The per capita possession of water resources in my country is only 2,710 cubic meters, about 1 / 4 of the world's per capita share, ranking 88th in the world. Some foreign countries have already adopted water recycling measures for industrial water use, and the water reuse rate is as high as 70% to 90%, while most cities in China still stay at the level of 20% to 50%. Due to the backward technology, the industrial water quota is far higher than the foreign advanced level. China accounts for 1.5% of the ...

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Problems solved by technology

According to my country's national conditions, the problem of water supply quality not only invalidates the mechanical flowmeter, but also invalidates the ultrasonic flowmeter. Transmitting and receiving faults occur in the meter, and in extreme cases: after the ultrasonic transmission, it cannot reach the receiver at all

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