Lubrication circuit of rotary vacuum pumps

Details Lubrication circuit of rotary vacuum pumps Lubrication circuit of rotary vacuum pumps

1988-02-02

1989-07-04

Vrablik, John J.

Pumps

With condition responsive pumped fluid control

Lubricant condition responsive

417295, 418 88, 418 96, 418 97, F04B 4902, F04C 2702

Patent

active

048447021

ABSTRACT:
A lubrication circuit connected to rotary vacuum pumps is composed of a hydraulic circuit and of the relative pump unit for lubrication and for auxiliary controls, including isolation of the negative pressure space from the pump on the stopping of the latter, with the aid of a closure member (10), for the operation of which use is made of the pressure of the fluid present in the pump discharge space with the aid of a duct (33, 34) between said discharge space and a means (8, 9) operating the closure member (10), which duct is subdivided into two portions between which is disposed a control member (27, 31) the operation of which is dependent on the oil pressure produced by the pump unit and propagated, with complete absence of flow, through a duct (23) so as to reach a control member (27, 31) which supervises the operation of the closure member (10).

REFERENCES:
patent: 1988296 (1935-01-01), Blume et al.
patent: 4366834 (1983-01-01), Hanson et al.
patent: 4483667 (1984-11-01), Berges et al.
patent: 4525129 (1985-06-01), Berges et al.

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