Sandmill control system
US3984055A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 1975 |
| Grant date | Oct 5, 1976 |
| Priority date | — |
| Expiry date | Jul 18, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C25/00
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
High pressure sandmill operation is obtained by balancing the pressure within the vessel on one side of a rotor shaft seal with a higher pressure on the other side of the seal. Pressure switches are employed to sense the pressure within the vessel, the seal housing, and the cooling water jacket surrounding the vessel. The switches are connected in electrical control circuits to deenergize the product pump whenever the sensed pressures are beyond predetermined acceptable ranges. The control circuits also energize lights which indicate which pressure was out of its range and energize a light indicating that the pump motor is deenergized. The control circuit further includes means responsive to the temperature of the product being pumped to the vessel so that an audible warning signal is generated if the temperature exceeds a predetermined level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.