Diaphragm pump guaranteed with operational reliability

Abstract

Provided is a diaphragm pump guaranteed with operational reliability that enables a fluid to be continuously sucked and discharged by causing a volume change of an working chamber through a diaphragm pulsating according to the flow of compressed air controlled by movement of a spool constituting an air control valve, and smoothly can pump a fluid by reliably controlling the flow of compressed air using an up-and-down motion of a spool performed by pressure of the compressed air, and thus completely resolving an inoperative situation caused by a delay in motion of the spool. The diaphragm pump includes: a pump body (10), a shaft (20), a first diaphragm (30), a second diaphragm (40), and an air control valve (50).

Description

REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority benefit of Korean Patent Application No. 10-2013-0097022 filed on Aug. 16, 2013, the entire contents of which are incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates, in general, to a diaphragm pump which enables a fluid to be continuously sucked and discharged by causing a volume change of a working chamber through a diaphragm pulsating according to the flow of compressed air controlled by movement of a spool constituting an air control valve, and, more particularly, to a diaphragm pump guaranteed with operational reliability which can smoothly pump a fluid by steadily controlling the flow of compressed air using an up-and-down motion of a spool performed by pressure of the compressed air, and thus completely resolving an inoperative situation caused by a delay in motion of the spool.BACKGROUND OF THE INVENTION[0003]Generally, a diaphragm pump is a small capacity meter...

AI Technical Summary

Benefits of technology

The present invention is a diaphragm pump that is designed to be reliable and efficient. It uses compressed air to control the motion of a spool, which ensures smooth pulsating of the diaphragm. This prevents delay in motion of the spool and ensures continuous and smooth pumping. Additionally, by controlling the motion of the spool with compressed air, the need for a separate pilot valve is eliminated, reducing parts, simplifying the structure, and reducing the unit price of the product.

Problems solved by technology

However, the conventional diaphragm pump has a structure in which lifting and lowering motions of the spool are generated in a low pressure situation by air pressure, and there is no packing for steadily controlling the flow of compressed air on an outer circumferential surface of the spool.

Accordingly, as the compressed air leaks through gaps due to tolerance limitations between the spool and the valve body, the working of air pressure is not properly maintained, the up-and-down motion of the spool is not smoothly performed, so the spool is delayed in motion at an ambiguous position inside the valve body, thereby causing an inoperative situation.

However, the conventional diaphragm pump is problematic in that the whole structure of the pump is complex, increasing the number of constitutive elements as well as increasing assembly time, and increasing unit price of the product because the pilot valve is further installed.

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