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Microwave vacuum freeze drying equipment and material drying method

A technology of microwave vacuum and drying equipment, which is applied in the direction of drying solid materials, drying solid materials without heating, lighting and heating equipment, etc. Field uniformity, avoids glow discharge, overcomes time-consuming effects

Active Publication Date: 2017-06-13
优澎(嘉兴)新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method of separating the magnetron and the space where the material is located, allowing microwaves to enter the warehouse where the material is located through the wave-transparent material, cannot fundamentally suppress the occurrence of the glow discharge phenomenon, because the second chamber is still in a high vacuum In the environment, the microwave will still discharge in such a vacuum
In addition, even if the microwave enters the first chamber from the inlet and is reflected by the chamber wall to form a multimode microwave field in the second chamber, the uniformity of microwave heating is greatly affected due to the fixed position of the sample to be freeze-dried
[0007] On the other hand, for airgel materials, among the main drying methods currently used, supercritical drying can well eliminate the capillary tension in the drying process, thereby maintaining the integrity of the material, but this method requires high equipment and costs Expensive, and there are great risks in the operation process; conventional vacuum freeze-drying reduces the cost of the equipment to a certain extent, but due to the use of conduction heating, the integrity of the airgel material is damaged due to uneven heating; normal pressure drying Although the cost of drying is greatly reduced, the surface of the material needs to be fully modified before drying, and the drying cycle becomes longer, which reduces the drying efficiency

Method used

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  • Microwave vacuum freeze drying equipment and material drying method
  • Microwave vacuum freeze drying equipment and material drying method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] In this example, use figure 1 The equipment shown freeze-dries banana chunks and operates as follows:

[0060] Open the microwave chamber door 13-2 and the freeze-drying chamber door 13-1, and place some banana pieces to be freeze-dried on the miniature conveyer belt 16 on the turntable 12 respectively. Close the freeze-drying bin door 13-1 and the microwave bin door 13-2 in sequence. The banana pieces are pre-cut into 1cm×1cm×1cm cubic pieces with a distance of about 0.5cm between them, and are evenly arranged on the miniature transmission belt 16 .

[0061] Open the refrigeration system 7 and valves 8-1 and 8-2, freeze the banana pieces on the turntable 12, and make the temperature of the vacuum water catch system drop to -20°C rapidly.

[0062] Program the microcomputer central control system so that it can automatically adjust the change mode of microwave power, the change mode and range of pressure, the matching mode of relative change between pressure and microw...

Embodiment 2

[0072] This embodiment is used as a preferred embodiment of the present invention, and the specific design method is the same as that of Embodiment 1, which is used to freeze-dry the cellulose SiO2 composite airgel material. The specific operation process is as follows:

[0073]Open the microwave chamber door 13-2 and the freeze-drying chamber door 13-1, and place a number of cellulose-SiO2 composite wet gels to be freeze-dried on the micro conveyor belt 16 on the turntable 12 respectively. Close the freeze-drying bin door 13-1 and the microwave bin door 13-2 in sequence. The wet gels are cubic blocks or plates with a distance of about 2 cm between them, and are evenly arranged on the miniature transmission belt 16 .

[0074] Turn on the refrigeration system 7 and the valves 8-1 and 8-2, freeze the wet gel on the turntable 12, and rapidly reduce the temperature of the vacuum water trapping system to -45°C.

[0075] Program the microcomputer central control system so that it ...

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Abstract

The invention provides microwave vacuum freeze drying equipment and an aerogel material drying method. The microwave vacuum freeze drying equipment comprises a microwave cabin, a freeze drying cabin, microwave generators of which the transmitting power can be continuously adjusted, a refrigerating system, a vacuum water-catching system, a pressure adjusting system, a vacuum pump and a micro-computer central control system, wherein the freeze drying cabin is arranged in the microwave cabin; the microwave generators of which the transmitting power can be continuously adjusted are fixed to the side wall of the microwave cabin and are uniformly and crossly arranged around the freeze drying cabin; the refrigerating system is connected with the freeze drying cabin and the vacuum water-catching system; the vacuum water-catching system is connected with the vacuum pump and the freeze drying cabin; the pressure adjusting system is connected with the vacuum pump and the freeze drying cabin; the pump is connected with the freeze drying cabin; and the micro-computer central control system is connected with the microwave generators and the pressure adjusting system so as to control microwave power and pressure.

Description

technical field [0001] The invention relates to a freeze-drying device, in particular to a vacuum freeze-drying device using microwaves as a heating source and a drying method for an airgel material. Background technique [0002] Due to the complete dehydration, the vacuum freeze-drying technology can retain the morphology and microstructure of the product to the greatest extent, and the rehydration is fast, so it has attracted more and more attention. It is a drying technology that freezes the water-containing material below the eutectic point temperature, so that the water and other solvents in the material can be directly sublimated into gas without melting under high vacuum. Traditional vacuum freeze-drying usually uses heat conduction to provide sublimation heat. This heating method has a long drying cycle, high energy consumption, and relatively expensive costs. At the same time, this heating method is carried out at a relatively high temperature, and when the food is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F26B5/06F26B25/00
CPCF26B5/048F26B5/06F26B25/00
Inventor 向军辉乐弦李飞赛华征关运龙付蕊章婷杨虎贾欢欢
Owner 优澎(嘉兴)新材料科技有限公司
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