A pump casing of a screw vacuum pump

Abstract

The invention provides a pump case of a screw vacuum pump, belongs to the technical field of screw vacuum pumps, and aims to solve the technical problem that a conventional pump case of the screw vacuum pump is high in use cost. The pump case of the screw vacuum pump comprises a pump body with a pump chamber, wherein a cooling water cavity is formed in the pump body; the pump body consists of a plurality of outer housings and an inner housing made of corrosion-resistant metal; the pump chamber is formed in the inner housing; two ring-shaped fixing flanges are formed on the outer wall of the inner housing in the length direction; the outer housings are arranged between the two fixing flanges and are in ring-shaped distribution; the two end edges of the outer housings and the fixing flanges are welded and sealed together; opposite edges of the adjacent outer housings are welded and sealed; and the cooling water cavity is formed between the outer housings and the inner housing. The pump case has the advantage that the corrosion resistance of the pump case can be realized without arranging a corrosion-resistant structure on the pump case under the condition of guaranteeing cooling of the pump case.

Description

technical field [0001] The invention belongs to the technical field of screw vacuum pumps, and relates to a pump shell of a screw vacuum pump. Background technique [0002] The screw vacuum pump is an air extraction device that uses two screws to rotate synchronously and at high speed in the pump body to generate air suction and exhaust. It is widely used in major domestic pharmaceutical and chemical companies in dusty gas occasions. [0003] When the screw vacuum pump is in use, it will generate heat due to the extrusion of the gas, so a cooling water cavity needs to be installed in the pump casing. At the same time, the gas pumped by the screw vacuum pump is corrosive during use, so the inner wall of the pump cavity of the pump casing needs to be treated with anti-corrosion treatment. At present, the pump casings of screw vacuum pumps on the market are all integrally formed. Due to the poor fluidity of anti-corrosion metals, it is impossible to obtain the pump casing at o...

AI Technical Summary

Problems solved by technology

At present, the pump casings of screw vacuum pumps on the market are all integrally formed. Due to the poor fluidity of anti-corrosion metals, it is impossible to obtain the pump casing at one time through casting and other processes; therefore, the pump casings of screw vacuum pumps on the market are all made of cast iron materials through casting. , the pump casing formed by casting has a cooling water cavity. The cast iron has good fluidity after melting, so it is suitable for the casting process, but the corrosion resistance of cast iron is poor, and the formed pump casing needs to be coated with anti-corrosion coating in the pump cavity Anti-corrosion treatment such as coating or fixed inner bushing can achieve anti-corrosion, but after a period of use, it is necessary to maintain the anti-corrosion coating or inner bushing to avoid wear and tear of the anti-corrosion coating or inner bushing. The pump casing is corroded, resulting in higher operating costs

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