Diaphragm pump unit
US5213484A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 1992 |
| Grant date | May 25, 1993 |
| Priority date | — |
| Expiry date | May 13, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04B53/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A pump body of a diaphragm pump unit comprises a housing and a pump placed therein, an elastic cover is attached to the housing so as to cover the upper portion of the housing. When the pump is operated with the upper opening of the housing of the pump body being covered with the cover, a fluid such as air is introduced into the housing through an inlet port made therein, flowing into a pressure chamber within the pump body. Since, at this time, the pressure in the housing becomes negative, an attraction force acts on the cover capping the upper portion of the pump body, whereby the cover is put in closer contact with the housing of the pump body to reduce noise leakage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.