Air operated diaphragm pump

Abstract

The invention discloses a pneumatic diaphragm pump, which comprises a pump casing, a check valve, an intermediate body, a diaphragm, a central shaft, a reversing shaft, a reversing rod, an air valve, a piston, a reversing slider and an air distribution slider, wherein , the middle position of the piston is provided with a reversing slider that can communicate with the left and right ends of the piston. The left and right sliding of the reversing slider controls the ventilation and exhaust of the chamber at the right end of the piston. The cross-sectional area of ​​the left end of the piston is smaller than the cross-sectional area of ​​the right end of the piston. Moving left and right drives the air distribution slider to slide left and right in reverse to control the conduction and closing of the vents of the left air chamber and the vents of the right air chamber, so as to realize the ventilation and exhaust of the left diaphragm chamber and the right diaphragm chamber. Due to the difference in the area at both ends of the piston, there is always a pressure difference between the two ends during ventilation, and the piston cannot stop at the middle position; the air intake and exhaust at both ends of the valve only exist in two states of on and off with the movement of the piston , it is impossible to have a half-connected state; thereby realizing that there is no dead point in the commutation process.

Description

technical field [0001] The invention relates to the technical field of diaphragm pumps, and particularly discloses a pneumatic diaphragm pump. Background technique [0002] Diaphragm pumps are operated by power to change the fluid flow, and are installed in various special occasions to pump various media that cannot be pumped by conventional pumps. Diaphragm pump is a special form of positive displacement pump. It relies on the back and forth agitation of a diaphragm to change the volume of the working chamber to suck and discharge liquid. [0003] Pneumatic diaphragm pumps can transport high-viscosity, large-particle media, flammable and explosive media, have self-priming capabilities, and can also be placed in the media to operate. The pneumatic diaphragm pump is mainly composed of two parts: the transmission part and the diaphragm cylinder head. The transmission part is the driving mechanism that drives the diaphragm back and agitates. Its transmission forms include mec...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a pneumatic diaphragm pump, which uses the relative movement of the reversing slider and the piston to realize the reversing, avoiding the problem that the reversing slider stays in the middle position and causing the incomplete reversing, so as to realize the reversing process no dead spots

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