Oil-free rotary vane vacuum self-priming centrifugal pump and its application method

Abstract

The invention relates to an oil-free rotary vane vacuum type self-priming centrifugal pump and a use method thereof. The oil-free rotary vane vacuum type self-priming centrifugal pump comprises a self-priming centrifugal pump body; a gas-liquid separation chamber, a liquid inlet pipe and a liquid discharging pipe are arranged on the self-priming centrifugal pump body; a first one-way valve is arranged on the liquid discharging pipe; a vacuum pump is integrated inside the gas-liquid separation chamber and integrated with the self-priming centrifugal pump body; the vacuum pump is an oil-free rotary vane vacuum pump and is provided with an inlet and an outlet; the inlet is communicated with the liquid inlet pipe through a suction pipeline; the outlet is communicated with the first one-way valve through an exhaust pipeline; a second one-way valve is arranged on the suction pipeline; the exhaust pipeline is provided with a third one-way valve and an electromagnetic valve; the third one-way valve is close to the first one-way valve; a liquid level switch is arranged on the liquid inlet pipe; the height of the liquid level switch on the liquid inlet pipe is lower than that of the suction pipeline; the liquid level switch is electrically connected with the vacuum pump and the electromagnetic valve. The pipeline system is simplified, the self-priming performance of the pump is improved, and the oil-free rotary vane vacuum type self-priming centrifugal pump has the advantages of being compact in structure, high in efficiency, long in service life and the like.

Description

technical field [0001] The invention belongs to the technical field of self-priming centrifugal pumps, in particular to an oil-free rotary vane vacuum self-priming centrifugal pump and its use method. Background technique [0002] As we all know, general self-priming centrifugal pumps have low efficiency, long self-priming time, and poor self-priming performance. They are not suitable for working conditions with large inlet pipe diameter, long pipeline, and high altitude. In addition, there are three types of self-priming centrifugal pumps that use vacuum devices on the market: the first type is a rotary vane vacuum pump type with drip oil lubrication, and the second type is a piston pump type with oil-free lubrication. The third type is the built-in water ring vacuum pump type. The first type of rotary vane vacuum pump with drip oil lubrication needs to add lubricating oil frequently, and the exhaust port of the vacuum pump cannot be set on the liquid outlet pipeline of th...

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Problems solved by technology

The first type of rotary vane vacuum pump with drip oil lubrication needs to add lubricating oil frequently, and the exhaust port of the vacuum pump cannot be set on the outlet pipe of the self-priming pump, which has adverse effects on the environment

The second type of piston pump with external oil-free lubrication is large in size and takes up space. After the medium enters the cavity of the piston pump, it will have an adverse effect on the cavity.

The self-priming performance of the third type of built-in water ring vacuum pump is worse than that of the first two types. During normal operation, the water ring vacuum pump continues to work, with low efficiency, and it is not suitable for high altitude environments.

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