Helical gear pump and method of manufacturing the same
US4030862A · kind A · utility
Inventor
Key dates
| Filing date | Apr 21, 1975 |
| Grant date | Jun 21, 1977 |
| Priority date | — |
| Expiry date | Apr 21, 1995 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/4981
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A helical gear pump in which the rotor is made of a wire or bar wound into a cylindrical helix. The rotor is made by twisting two wires or bars around each other, separating the two helices so formed, and using one or both of them as a rotor. The stator is made of a tube of plastics which is formed by inserting into the tube a mandrel having threads correspondng to required internal threads of the stator, causing the plastics tube to soften and applying external pressure to it to make its inside assume a shape corresponding to that of the mandrel. The mandrel is made by winding helically two wires about a third straight wire and securing the first-mentioned two wires to the third wire, all the said wires having about the same diameter as the wire of which the rotor is made.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.