Water meter achieving more precise metering

Abstract

The invention relates to a water meter achieving more precise metering. The water meter comprises a water meter body which is internally provided with an upper cavity and a lower cavity, a water inlet communicated with the exterior is formed in the lower cavity, a water outlet communicated with the exterior is formed in the upper cavity, the water meter further comprises a lower fluid director, an upper fluid director, an impeller and an electromagnetic induction metering device, the impeller comprises an impeller body, an impeller shaft, a rotating shaft and a shaft sleeve, the impeller body and the impeller shaft are rotationally connected into a cavity formed by the upper fluid director and the lower fluid director in an enclosing mode through the rotating shaft and the shaft sleeve, and the distance from the vertex of the rotating shaft to the center of gravity of the impeller is smaller than the nominal diameter of the impeller. According to the water meter, the electromagnetic induction metering device is adopted for metering the water flow rate, the length of impeller is greatly reduced, the distance L from the vertex of the rotating shaft to the center of gravity of the impeller is smaller than the nominal diameter D of the impeller, the stability of impeller rotation is greatly improved, the service life is prolonged, the metering precision is improved, and the manufacturing cost is lowered.

Description

technical field [0001] The invention relates to the field of water meters, in particular to a water meter with more accurate measurement. Background technique [0002] A water meter is a common water flow measurement tool in daily life. When water enters the impeller box from the water inlet of the water meter, it impacts the impeller, causing the impeller to generate a driving torque. When the driving torque of the impeller is greater than the resistance of the impeller, the impeller starts to rotate and the water meter begins to measure . In order to separate dry and wet water in existing water meters, the impeller shafts extend out of the upper deflector, and then a series of transmission parts are used to measure the water flow at the upper end of the impeller shaft. In this way, the impeller shaft must be made very long, not only the rotation stability of the impeller is poor , and the measurement accuracy is also poor. In addition, due to the gravity of the impeller ...

AI Technical Summary

Problems solved by technology

In the existing water meter, in order to separate the dry from the wet, the impeller shaft extends out of the upper deflector, and then a series of transmission parts are used to measure the water flow at the upper end of the impeller shaft. In this way, the impeller shaft must be made very long, not only the rotation stability of the impeller is poor , and the measurement accuracy is also poor

In addition, due to the gravity of the impeller, there will be static friction between the thimble and the impeller shaft, and this part of the static friction will become the resistance when the impeller rotates. In the case of small flow, the water meter cannot accurately measure the water flow

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