Method and apparatus for liquid supply
US4179242A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 26, 1978 |
| Grant date | Dec 18, 1979 |
| Priority date | — |
| Expiry date | Apr 26, 1998 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D15/029
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A method and an apparatus for liquid supply use a pressure tank and a plurality of pumps. When the pressure or liquid quantity in the pressure tank has decreased below a predetermined level, a preceding or regular pump starts. When the demand is too large for this pump, another pump in standby position starts, too. The regular pump continues running for a predetermined period of time after the start, even if the pressure or liquid quantity in the pressure tank has returned to a predetermined level, whereas the standby comes to a stop upon such recovery. In this manner the frequency of starting the pumps is minimized so as to avoid overheating of pump-driving motors and reduce the power consumption.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.