Minitype pneumatic pump

Abstract

A miniature pneumatic pump is composed of motor unit, compression unit and inlet-outlet module consisting of air valve and piston compression block. Said compression unit comprises the piston with multiple compression cavities, supporter and compression plate. Said piston compression block has multiple outpuets and inlets to form multiple outlet and inlet channels with one-way valves. Another one-way valve is arranged at middle position of valve plate for preventing reverse flow.

Description

【Technical field】 [0001] The invention relates to an air pressure pump, in particular to a miniature air pressure pump, in particular to a miniature air pressure pump suitable for use on an electronic sphygmomanometer. 【Background technique】 [0002] The gas diversion method and structure of the commonly used micro pneumatic pump are not perfect enough, and the operation is not stable enough and smooth enough in the actual use process. [0003] China Patent Office authorized the announcement on October 24, 2001. The name of the invention is "Micro-pump gas diversion mechanism", and the patent number is ZL00225848. Utility model patent. This mechanism mainly includes a motor assembly, a compression section and an air collection section. Among them, the linkage rod of the compression part is inserted into the eccentric hole of the motor rotating part, and the motor rotates the eccentric hole to drive the linkage rod to rotate in a circle, so that the compression part sends ga...

AI Technical Summary

Problems solved by technology

[0004] Although this micropump overcomes some deficiencies of commonly used micropumps, it is not perfect and still has the following deficiencies: 1. The installation of the check valve is extremely inconvenient, and ultrasonic welding is required in the assembly process, which will make it Increased cost

2. The transmission mechanism is too cumbersome, and the cumbersome transmission mechanism will produce up and down serial motion, which will affect the life of the micro pump and be accompanied by loud noise

3. The most important thing is that when the micropump is working, there is a phenomenon of gas backflow, which affects the measurement accuracy of blood pressure

4. The overall assembly is fixed with screws, which makes the production process cumbersome and increases the production cost

The difference between this patent application and the Chinese utility model patent No. ZL00225848 lies in the use of a three-dimensional one-way valve. The practical problems of the three-dimensional one-way valve are poor airtightness, difficult assembly, and difficult process guarantees.

In addition, the Japanese patent application also has the cost problem of ultrasonic welding, the noise problem caused by the overly cumbersome transmission mechanism, and the overall assembly is fixed by screws, which makes the production process cumbersome and increases the production cost.

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