Flowmeter

Abstract

The invention relates to a flowmeter, and belongs to the technical field of new energy and flow instruments. A shell comprises a fluid cavity and an electric control cavity, a shaft hole is formed in the bottom wall of the fluid cavity, an inlet-outlet is formed in the side wall, and an annular groove and a sinking cavity are formed in the bottom wall of the electric control cavity. A sealing cover is arranged at the end part of the fluid cavity; the circuit board is pressed in the electric control cavity by a cover plate; a magnet is arranged on the wheel disc with the half shaft and the blades, and the half shaft is arranged in the shaft hole; the elastic film is pressed on the bottom wall of the annular groove through the annular plate provided with the sinking groove; a limiting pad or a fixed composite film consisting of a fixed electrode and a fixed friction layer is arranged on the bottom walls of the sinking groove and the sinking cavity; the elastic film is an independent metal layer or a composite film formed by the metal layer, a piezoelectric layer and a dynamic friction layer; the metal layer and the dynamic friction layer form a dynamic composite film; the metal layer and the piezoelectric layer form a piezoelectric energy harvesting unit, the movable and fixed composite films form a friction energy harvesting unit, and mechanical energy is converted into electric energy through bending deformation of the composite films and contact and separation between the composite films and the fixed composite films; and the number of the pulse voltage signals in unit time is used for representing the fluid flow.

Description

technical field [0001] The invention belongs to the technical field of new energy and flow meters, and in particular relates to a flow meter, which is used to measure the flow of residential gas and tap water. Background technique [0002] Tap water is an indispensable consumer product in the daily life of urban residents, and its consumption records and statistics are still mainly done manually. Manual meter reading is not only inefficient and wastes manpower and material resources, but more importantly, meter readers often go back and forth many times in vain due to no one in the household, which seriously affects the accuracy and real-time performance of data statistics. Therefore, people began to develop tap water and gas Remote automatic meter reading system, and can be applied in new houses. Although the data processing and transmission technology of the existing meter reading system is very mature, it is still difficult to popularize and apply it in old residential a...

AI Technical Summary

Problems solved by technology

Manual meter reading is not only inefficient and wastes manpower and material resources, but more importantly, meter readers often go back and forth many times in vain due to no one in the household, which seriously affects the accuracy and real-time performance of data statistics. Therefore, people began to develop tap water and gas Remote automatic meter reading system, and it can be applied in new houses

Although the data processing and transmission technology of the existing meter reading system is very mature, it is still difficult to popularize and apply it in old residential areas. Laying cables, so people are trying to develop a flow meter that can be self-sufficient in electrical energy

[0003] At present, people have developed various forms of gas and tap water meters powered by piezoelectric power generation, such as Chinese patent ZL2015100072748, etc. The existing meters use the intermittent coupling force between the excitation magnet and the excited magnet to achieve power transmission. , starting resistance is large, not suitable for low-speed water flow and gas flow measurement

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