A Multi-stage Diaphragm Pump with Axial Split and Series Design

Abstract

The invention discloses a multi-stage diaphragm pump with shaft opening and series design, which includes a pump body, a pressure regulating device, a driving device and a diaphragm, the pump body is connected to the pressure regulating device, the driving device is connected to the pump body, and the diaphragm is connected to the pump body. The driving device and the diaphragm are connected by transmission, and the adjacent pump body is intermittently connected through the pipeline. The pump body is provided with a working chamber, and the diaphragm is placed in the working chamber. The diaphragm separates the working chamber and the pressure regulating chamber. The pump casing and the end cover are connected by flanges. The end cover is located on the lower side of the pump casing. There are at least two multi-stage diaphragm pumps. Adjacent diaphragm pumps are connected through pipelines, and the diaphragm pump passes through The pipes are connected in series to prevent single diaphragm failure from affecting the performance of the overall pump fluid. The pressure regulator is used to regulate the pressure of the pump fluid to stabilize the pressure of the pump fluid. The shaft-open design of the pump casing and end cover facilitates the replacement of the diaphragm.

Description

A multi-stage diaphragm pump with shaft-opening series design technical field [0001] The present invention relates to the technical field of diaphragm pumps, in particular to a multistage diaphragm pump with a series of shaft openings. Background technique Diaphragm pump is a kind of variable volume type fluid delivery pump, drives cam to rotate by motor input torque, thereby drives The diaphragm is deformed, and the diaphragm generates negative pressure and positive pressure alternately through deformation in a relatively sealed environment, thereby pumping liquid. However, the diaphragm that most existing diaphragm pumps adopts adopts flexible material, although has good deformability [0003] Yes, but when the negative pressure is drawn, because the material itself is easily deformed, it will move back quickly when it is stressed. Negative pressure is formed locally in the liquid chamber. At this time, the negative pressure is the unsaturated vapor pressure. In orde...

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Problems solved by technology

[0003] However, the diaphragms used in most existing diaphragm pumps are made of flexible materials. Although they have good deformation properties, when negative pressure is drawn, the material itself is prone to deformation, and it will move back quickly when the force is applied. A negative pressure is locally formed in the liquid pump chamber of the liquid pump. At this time, the negative pressure is the unsaturated vapor pressure. In order to balance the pressure, part of the medium will be vaporized to form a gas.

During liquid transportation, the gasification of the medium occupies a certain volume, which affects the accuracy of the pump liquid

[0004] With the continuous improvement of liquid supply accuracy, the requirements for the stability of liquid medium delivery are also getting higher and higher. Most of the existing diaphragm pumps are only single-stage pumps, which cannot be automatically adjusted according to the delivery pressure. A large pressure fluctuation threshold is formed, which affects the stability of the liquid supply

In addition, most of the existing diaphragm pumps control the on-off of the flow path through the valve ball, and the weight of the valve ball will cause the hysteresis of the flow path on-off. When the flow path is connected in series, the sensitivity of the flow path on-off will be greatly reduced. , the infusion stability cannot be guaranteed

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