SU832281A1

SU832281A1 - Tray for sublimation dryer

Info

Publication number: SU832281A1
Application number: SU782620219A
Authority: SU
Inventors: Валерий Никитич Байбуз; Эрнест Иванович Каухчешвили; Элеонора Федоровна Якушева
Original assignee: Bajbuz Valerij N; Kaukhcheshvili Ernest; Yakusheva Eleonora F
Priority date: 1978-05-29
Filing date: 1978-05-29
Publication date: 1981-05-23

Description

(54) ПРОТИВЕНЬ Д/|Я СУБЛИМАЦИОПНОЙ СУШИЛКИ(54) AGAINST D / | I SUBLIMATIC DRYER

II

Изобретение относитс к технике сублимационной сушки и может быть использовано в пищевой, химической и др. отрасл х промышленности.The invention relates to a freeze-drying technique and can be used in the food, chemical and other industries.

Известны противни дл сублимационной сушилки, дннще которых имеет электрообогрев 1 .Known trays for freeze-dryer, the bottom of which is electrically heated 1.

Недостатком известных противней вл етс равномерность нагрева всей плош,ади днища без учета действительной потребности в тепле дл сушки материала, например пищевого продукта, наход щегос на днище в каждой конкретной зоне. Из-за этого та часть продукта, котора высохла в одной из зон быстрее, чем в остальных, получа излишние количества тепла, может перегреватьс в подгорать. Дл предотвращени перегревов снижают общий уровень подвода тепла, в том числе и ко всем остальным зонам днища противн , так как в известных противн х принцилиально невозможно выборочное и локальное его снижение в отдельно вз тых зонах. В результате интенсивность сушки значительно снижаетс , увеличиваетс длительность процесса.A disadvantage of the known trays is the uniform heating of the entire plate, the bottom without taking into account the actual heat demand for drying the material, for example a food product, located on the bottom in each specific zone. Because of this, that part of the product that has dried in one of the zones faster than in the others, resulting in excessive amounts of heat, can be overheated in the burn. To prevent overheating, the overall level of heat supply is reduced, including to all other bottom zones of the opposite, since in certain opposes, it is fundamentally impossible to selectively and locally reduce it in separate zones. As a result, the drying rate is significantly reduced, and the duration of the process increases.

Цель изобретени - интенсификаци процесса сушки путем саморегулировани The purpose of the invention is to intensify the drying process by self-regulation

величин тепловых потоков к сушимому продукту по площади днища.values of heat fluxes to the dried product over the bottom area.

Поставленна цель достигаетс тем, что дниц1е противн выполнено в виде герметичной полости, заполненной на 0,4 - 0,8 своего объема легкокип щей жидкостью, в которую погружен электронагреватель.This goal is achieved by the fact that the bottom of the billet is made in the form of a sealed cavity filled to 0.4–0.8 of its volume with a light boiling liquid in which the electric heater is immersed.

На чертеже схематически изображен противень со схемой электропитани и защиты , продольный разрез.The drawing shows schematically a pan with a power supply and protection scheme, a longitudinal section.

Противень дл сублимационной сушилки имеет боковые стенки 1, днище 2 в виде The baking sheet for the freeze dryer has side walls 1, the bottom 2 in the form

0 герметичной полости, заполненной легкокип щей жидкостью 3, в которую погружен электронагреватель (ТЭН) 4, соединенный через проходные контакты 5 электрическими кабел ми 6 с системой электропитани и 0 a sealed cavity filled with a light-boiling liquid 3, into which an electrical heater (TEN) 4 is immersed, connected through loop-through contacts 5 by electric cables 6 to a power supply system and

5 защиты, состо щей из магнитного пускател 7 и реле давлени 8. Сушке подвергаетс продукт 9.5 protection consisting of a magnetic actuator 7 and a pressure switch 8. The product 9 is dried.

Противень работает следующим образом.Baking tray works as follows.

Claims

After loading the baking sheet placed in the freeze dryer with product 9, an electric voltage is applied to the electric heater 4 through the magnetic starter 7. The resulting heat heats and converts the light boiling liquid 3 into vapor. The vapor condenses, giving off the heat of condensation in those areas of the upper part of the sealed cavity of the bottom 2, where the temperature drops. Since the lowering of the temperature occurs most under the pieces of product 9, the bulk of the steam condenses beneath them, providing the most optimal heat supply across the bottom 2 of the existing product 9. If in one of the zones the product 9 dries faster, then the lowering of the temperature of the upper the walls of the sealed cavity of the bottom 2 will decrease, automatically reducing the amount of heat supplied to this zone. However, there is no reduction in the heat input in the remaining zones where the drying process has not yet been completed. Consequently, the self-regulation of heat fluxes to the product 9 over the bottom area of 2 baking sheets during the whole drying process provides intensification and reduction of the drying time. Distilled water may be used as a light-boiling liquid. couples which at working temperatures S / 7 / // ////////////////// X // y /// ХУХ / / opposite, equal to 60 + 100 ° С, have pressure close to atmospheric. In order to prevent a higher | {and vapor pressure of boiling liquid 3, the pressure switch 8 is provided higher than the allowable one, which controls the magnetic starter 7, interrupting the electric heater 4 supply circuit to the necessary cases. The proposed device provides for intensification and reduction of the drying time. Claims of invention The pan for the freeze-dryer, the bottom of which is electrically heated, characterized in that, in order to intensify the process, drying, the bottom is provided with bk}. a sealed cavity filled with O 1 CUiTiv-i 1 0.4 - 0.8 of its volume with a light boiling liquid in which the electric heater is immersed. Information sources. taken into account during the examination 1 USSR Copyright Certificate No. 568814, cl. F 26 B 5/06, 1973. FX