Multistage diaphragm pump adopting shaft opening series connection design

Abstract

The multi-stage diaphragm pump comprises pump bodies, pressure regulating devices, driving devices and diaphragms, the pump bodies are connected with the pressure regulating devices, the driving devices are connected with the pump bodies, the diaphragms are connected with the pump bodies, the driving devices are in transmission connection with the diaphragms, the adjacent pump bodies are intermittently communicated through pipelines, working cavities are formed in the pump bodies, the diaphragms are arranged in the working cavities, and the working cavities are communicated with the driving devices. The pump body comprises a pump shell and an end cover, a pressure regulating chamber is arranged on one side of the working cavity, the working cavity and the pressure regulating chamber are separated through diaphragms, the pump shell and the end cover are connected through a flange, the end cover is located on the lower side of the pump shell, the number of the multi-stage diaphragm pumps is at least two, adjacent diaphragm pumps are communicated through pipelines, and the diaphragm pumps are connected in series through pipelines. The integral pump liquid performance is prevented from being affected by damage and failure of a single diaphragm, the pressure is adjusted through the pressure adjusting device, the pump liquid pressure is stable, and the diaphragm is convenient to replace due to the open-type design of the pump shell and the end cover shaft.

Description

technical field [0001] The invention relates to the technical field of diaphragm pumps, in particular to a multi-stage diaphragm pump with a shaft-opening series design. Background technique [0002] Diaphragm pump is a variable volume fluid delivery pump. The input torque of the motor drives the cam to rotate, thereby driving the diaphragm to deform. The diaphragm generates negative pressure and positive pressure alternately through deformation in a relatively sealed environment, thereby pumping liquid. [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 liquid chamber. At this time, the negative pressure is the unsaturated vapor pressure. In order to balance the pressure, part of the med...

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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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