SU1231258A1 - Rotary oilless roughing-down pump - Google Patents

Description

The invention relates to a vacuum and compressor machinery, in particular to a rotary oil-free fore vacuum pump.

The purpose of the invention is to simplify the design and reduce the size.

FIG. 1 schematically shows a rotary oil-free fore vacuum pump, cross section; FIG. 2 is a section A-A in FIG. one.

The rotor oil-free fore vacuum pump includes a housing 1 with inlet and outlet nozzles 2 and 3, a rotor 4 with rollers placed in it

5, envelope their elastic shell

6, which forms with the housing 1 a working chamber 7, an overflow pipeline 8 connected at one end to the cavity 9 of the shell 6, and the other end of the pipeline 8 is connected to the working chamber 7 in the section of the housing 1 located between the rollers 5 outside

 the communication zone of the chamber 7 with the nozzles 2 and 3 at any position of the rotor 4. The bypass pipeline 8 is equipped with a spring-loaded diaphragm valve 10, the diaphragm valve has a spring 11 and a diaphragm 12.

The rotary oil-free fore pump is as follows.

When the rotor 4 rotates, the rollers 5 deform the casing 6, pressing it against the housing 1 and moving the gas from the inlet nozzle 2 to the outlet nozzle 3, creating a vacuum p of the displaced volume. In addition, the gas through the bypass pipe 8 and the membrane valve 10 is pumped out of the cavity 9 of the sheath 6. Upon reaching the intermediate vacuum in the cavity 9

the pressure 6 over the membrane 12 will compress the spring 11 and close the nozzle 8.

H

t valve

FIG. 2

Editor M. Nedoluzhenko

Compiled by S. Zabugin -.

Tehred V. Kadar Proofreader A. Ferenc

Order 2550/40

Circulation 586. Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Claims (2)

1. ROTARY OIL-FREE FORVACUMUM PUMP, comprising a housing with inlet and outlet nozzles, a rotor with rollers placed around it, an envelope enveloping their elastic shell, forming a working chamber with a housing, a bypass pipe connected at one end to the cavity of the shell, characterized in that, for the purpose of simplifying the design and reducing the dimensions, the other end of the pipeline is connected to the working chamber on a section of the housing located between the rollers outside the zone; camera messages with nozzles at any position of the rotor. 2. The pump according to π. 1, due to the fact that the bypass pipe is equipped with a spring-loaded diaphragm valve. SU _p „1231258 A1