Metal-nozzle and micro-flow water flow sensor

Abstract

The invention relates to a water flow sensor. The water flow sensor mainly comprises a shell (3) and is characterized in that a water inlet (1) and a water outlet (2) are respectively formed in the front and rear ends of the shell (3), an impeller (4) is mounted in the shell (3), and the impeller (4) is provided with an impeller shaft (5), magnets (6) and impeller blades (7); the opening of the shell (3) is provided with an upper cover (9), and a sealing ring (11) is arranged between the shell (3) and the upper cover (9), a position, close to the magnets (6), of the upper cover (9) is provided with a sensing head (10), the water inlet (1) is provided with an elastic metal sheet (8), one end of the elastic metal sheet (8) is narrowed and forms an included angle with the water inlet (1) so as to form a nozzle (12), and the opening of the nozzle (12) directly faces the impeller blades (7).

Description

technical field [0001] A water flow sensor is characterized in that the nozzle has an elastic metal sheet. Background technique [0002] If the reverse osmosis pure water machine is measured from the pure water side of the reverse osmosis membrane, it can meet the flow rate requirements of 0.1L-0.25L / min micro-flow water, the error is kept in the range of +%3, and the performance is stable, and the mass production is consistent; usually in This flow rate requires a special structure such as the plunger pump moving metering method. The plunger pump method needs to be driven by a motor, and the structure is complicated, so it is only suitable for occasions with strict chemical and pharmaceutical requirements, and has no application value in small household reverse osmosis. ; With the impeller method, the start-up flow rate of the impeller needs to be met during the micro-flow, and any small disturbance under the micro-flow may cause a large measurement error. Contents of the...

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Problems solved by technology

[0002] If the reverse osmosis pure water machine is measured from the pure water side of the reverse osmosis membrane, it can meet the flow rate requirements of 0.1L-0.25L / min micro-flow water, the error is kept in the range of +%3, and the performance is stable, and the mass production is consistent; usually in This flow rate requires a special structure such as the plunger pump moving metering method. The plunger pump method needs to be driven by a motor, and the structure is complicated, so it is only suitable for occasions with strict chemical and pharmaceutical requirements, and has no application value in small household reverse osmosis. ; With the impeller method, the start-up flow rate of the impeller needs to be met during the micro-flow, and any small disturbance under the micro-flow may cause a large measurement error

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