Patent · US Expired

Circulating pump

US4878804A · kind A · utility

11Cited by

6References

5Claims

0Family size

Assignee

Bieri Pumpenbau AG · CH

Inventors

Paul Akerman · East Greenwich, US
Wolfram Meyer · Baiersdorf, DE

Key dates

Filing date	Sep 12, 1988
Grant date	Nov 7, 1989
Priority date	—
Expiry date	Sep 12, 2008

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF04D13/0633
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

A bearing cap (16) is sealingly inserted between a front bearing bush (3) and a fluid-tight sleeve (17). Between a front portion (10) of a rotor shaft (5) and the front bearing bush, two overlying lubricating grooves (11, 12) are disposed. On a rear portion (13) of the shaft, a baffle plate (20) having vanes is mounted, an annular gap (21) existing between the shaft and the inside diameter of the vanes. Between the rear portion of the shaft and a rear bearing bush (4), lubricating grooves (14, 15) are formed continuously. The rotor chamber is quickly vented, no contamination thereof taking place. Lubrication and heat evacuation from the rotor chamber are ensured.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.