High-precision control system and method for shipborne cryogenic flash freezing of aquatic product using liquid nitrogen
US11519656B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Mar 12, 2020 |
| Grant date | Dec 6, 2022 |
| Priority date | — |
| Expiry date | May 7, 2041 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF25D2700/06
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A high-precision control system and method for shipborne cryogenic flash freezing of an aquatic product using liquid nitrogen is described. The system may include a main control system, a display unit, a liquid nitrogen supply system, a valve control unit, an acquisition unit, and a power unit. A flash freezing process is divided into four stages: a precooling stage, a flash freezing stage, a deep freezing stage, and a thermal insulation stage. Different cooling rates and flash freezing times are used for different stages, where a cooling rate is used in the flash freezing stage is the highest, a cooling rate used in the deep freezing stage is next, a cooling rate used in the precooling stage is the lowest, and an ambient temperature in a device is kept stable in the thermal insulation stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.