High-pumping-speed oil diffusion ejector pump

Abstract

The invention relates to an oil diffusion ejector pump, in particular to a high-pumping-speed oil diffusion ejector pump. According to the high-pumping-speed oil diffusion ejector pump, an oil guard device is arranged in an exhaust opening in a pump body; a pump core assembly is vertically arranged in a center oil groove in the pump body; the upper portion of the pump core assembly is fastened with the inner wall of the pump body through a supporting frame; an observation window and a temperature measurement resistor are arranged on the lower portion of the pump body; the pump core assembly is of an integral structure composed of a first-stage flow guide pipe, a second-stage flow guide pipe, a third-stage flow guide pipe and a fourth-stage flow guide pipe, all of which are sequentially arranged from inside to outside; umbrella-cap-shaped diffusion nozzles are arranged on the upper portions of all the stages of flow guide pipes; and a fifth-stage nozzle is vertically arranged at the bottom of the fourth-stage flow guide pipe. The high-pumping-speed oil diffusion ejector pump has the beneficial effects of being high in final vacuum degree, short in time for reaching final vacuum, high in pumping rate, low in oil return rate and low in electricity consumption.

Description

technical field [0001] The invention relates to an oil diffusion jet pump, in particular to an oil diffusion jet pump with high pumping speed, which is suitable for vacuum welding and vacuum coating. Background technique [0002] The oil diffusion jet pump is a kind of jet vacuum pump. It works in the high vacuum area and uses low pressure and high speed oil vapor as the working medium. The pumping process of the pump is the process in which the pumped gas diffuses into the oil vapor jet and is carried to the pump outlet for discharge. It is composed of pump body, pump core assembly, heater and other components. The pump body is mostly made of carbon steel or stainless steel; the pump core assembly is composed of a nozzle and a guide tube. The pump core assembly is a key component of the high vacuum oil diffusion pump, and the main materials are aluminum or stainless steel. In addition to being widely used in general industries, oil diffusion pumps are especially suitable ...

AI Technical Summary

Problems solved by technology

[0003] The traditional oil diffusion jet pump is mainly divided into two types according to the shape of the pump body, which are straight cavity and convex cavity. Due to the difficulty of processing and the limitation of the overall structure, there is no oil diffusion jet pump that meets the high pumping speed on the market. Requirements, because the oil diffusion jet pump with traditional technical structure cannot produce multi-stage oil diffusion jet vacuum pump, its application field is limited

The pumping speed of the traditional oil diffusion jet pump is small, the original pumping rate can only reach 14000L / s at most, the ultimate vacuum is low, the time to reach the ultimate vacuum is long, and the ultimate vacuum degree is up to 7×10 -3 Pa, it takes a long time to reach the ultimate vacuum, the oil return rate is high, and the power consumption is large

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