Cooling attachment for a grinder
US5775606A · kind A · utility
Inventor
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Jul 7, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB02C19/186
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
In essence, my design for cryogenic grinding and controlling the temperature of grinding makes use of liquid nitrogen, heated in thin-walled metal containers by the room temperature air. The nitrogen gas (or liquid) is conveyed by tubes to a cylinder cover fixed on top of the grinder's grinding chamber. The cover allows sufficient heat transfer and prevents producing static electricity by the spinning particles, and also prevents nitrogen from forming a liquid layer on the bottom of the cover. In my design: 1. The driving force of gas or liquid nitrogen is provided from the heat transferred between the liquid nitrogen in the containers and room temperature air, which creates pressure; 2. The temperature of grinding can be controlled by changing the flow rate of the room temperature air and by putting on or removing the rubber safety plug of one container; 3. Circulating the cold nitrogen by gas natural convection to cool down the motor allows continuous grinding. With Yang Cooling Attachment, the time needed to grind particles is reduced from a matter of days to matter of hours|
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.