Negative-pressure filtering device

Abstract

The invention discloses a negative-pressure filtering device. The negative-pressure filtering device comprises a negative-pressure bottle, a vacuum pump connected with the negative-pressure bottle and a funnel arranged on the negative-pressure bottle, wherein a rubber plug is arranged at the connection part of the funnel and the negative-pressure bottle; a pressure regulating cavity is arranged at the upper end of a side wall of the negative-pressure bottle; the pressure regulating cavity is provided with a gas inlet channel and a pressure regulating channel connected with the vacuum pump; a ventilation channel is arranged between the pressure regulating cavity and the lower end of the side wall of the negative-pressure bottle; a control valve body is arranged in the ventilation channel; a control knob connected with the control valve body is arranged at the outer part of the negative-pressure bottle; a flow regulating valve is arranged on the pressure regulating channel. The negative-pressure filtering device is simple in structure and convenient to operate; the connection or disconnection of the pressure regulating cavity and the negative-pressure bottle can be effectively controlled according to requirements, so that gas pressure in the funnel is approximate to gas pressure in the negative-pressure bottle, and the funnel and the negative-pressure bottle can be conveniently and easily separated, and furthermore, the working efficiency can be improved to a certain extent; the negative-pressure filtering device is good in utilization stability, strong in adaptability and good in practicability.

Description

technical field [0001] The invention belongs to the technical field of filtering equipment, and in particular relates to a negative pressure filtering device. Background technique [0002] In the chemical reaction process, generally all need to carry out filtration operation, due to the needs of work, sometimes filtration can not be carried out under normal pressure, so need to carry out decompression suction filtration, the suction filtration device of prior art mostly consists of suction filtration bottle, funnel and Composed of a vacuum pump, the vacuum pump pumps out the gas in the filter bottle, so that the inside of the filter bottle is in a negative pressure state, the liquid-solid mixture is located in the funnel, and the funnel is connected to the filter bottle through a rubber plug. Due to the effect of pressure difference, the liquid-solid mixture is used It can be separated, although it can effectively realize negative pressure suction filtration, but it also has...

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Problems solved by technology

[0002] In the chemical reaction process, generally all need to carry out filtration operation, due to the needs of work, sometimes filtration can not be carried out under normal pressure, so need to carry out decompression suction filtration, the suction filtration device of prior art is mostly made up of suction filtration bottle, funnel and It consists of a vacuum pump, which pumps out the gas in the filter bottle, making the inside of the filter bottle in a negative pressure state, the liquid-solid mixture is located in the funnel, and the funnel is connected with the filter bottle through a rubber plug. Due to the effect of pressure difference, the liquid-solid mixture is used It can be separated, although it can effectively realize negative pressure suction filtration, but it also has certain shortcomings such as due to the force of negative pressure, the suction filtration bottle and funnel are not easy to separate, so it will affect the suction filtration efficiency to a certain extent. Affect applicability and usefulness

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