Microwave continuous freeze-drying device

A microwave and freeze-drying technology, which is applied in the direction of drying, drying machine, drying solid materials, etc., can solve the problems of increasing manufacturing difficulty and cost, reducing the probability of discharge and release, and uneven drying of materials, so as to protect the vacuum characteristics and avoid Glow discharge, high quality effect

Inactive Publication Date: 2013-02-27
SICHUAN HOPE MICROWAVE SCI & TECH
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AI Technical Summary

Problems solved by technology

Experiments have proved that this method of separating the freeze-drying chamber into a vacuum chamber and an atmospheric pressure microwave chamber by using wave-transparent materials reduces the probability of discharge to a certain extent. One side of the freeze-drying chamber is a metal conduction plate, two sides are metal plates, and one side is a wave-transparent material. In this way, the microwave is reflected by the three metal chamber walls in the freeze-drying chamber in a vacuum environment, causing the microwave field to be uneven. Uneven drying, low yield and poor quality
At the same time, the feed belt and return belt of the belt conveyor system are in the same freeze-drying chamber, which increases the difficulty and cost of manufacturing, high failure rate in operation, and difficult implementation

Method used

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Effect test

Embodiment 1

[0033] As the simplest embodiment of the present invention, on the basis of the existing microwave continuous freeze-drying device, such as the two existing freeze-drying devices listed in the background technology, the left and right walls of the freeze-drying warehouse are The walls of the tank and the bottom chamber are made of non-metallic wave-transparent materials such as polytetrafluoroethylene, polyethylene, polypropylene or quartz glass.

Embodiment 2

[0035] As the best embodiment of the present invention, such as figure 1 , 2 As shown, the vacuum continuous feeding mechanism 9, the vacuum continuous discharging mechanism 10, the microwave system 7, the microwave suppressor 8, the vacuum water catch system 1, the microwave chamber 6, the material transmission system 4, the freeze-drying chamber 5 and the microwave shielding plate 2 composition.

[0036] Among them, the freeze-drying chamber 5 is made of non-metallic wave-transparent materials, such as polytetrafluoroethylene, etc., which are non-toxic, odorless, have certain strength, wave penetration, low microwave loss, and certain temperature resistance;

[0037] The microwave shielding plate 2 is made of metal and has uniform through holes, which can inhibit the passage of microwaves and ensure the passage of water vapor;

[0038] The freeze-drying chamber 5 has a "concave" cross-sectional shape, on which a microwave shielding plate 2 is installed, and then connected ...

Embodiment 3

[0046] Depend on figure 1 , 2 Shown constitutes a microwave continuous freeze-drying device.

[0047] The microwave system adopts a microwave source with a frequency of 2450MHz and a slit antenna feeding method. The power of a single wave source is 2kW, and the total power of multiple sets reaches 30kW; the freeze-drying chamber 5 is made of polytetrafluoroethylene; Fluorine-coated glass fiber tape; Material 3 is a material with a moisture content of 65% that has been frozen below the eutectic point.

[0048] The main operation process is as follows:

[0049] Vacuumize the vacuum water catch system 1 so that the air pressure in the freeze-drying chamber 5 drops below 133Pa;

[0050] The material 3 is continuously sent to the conveyor belt in the material conveying system 4 by the continuous feeding system 9 and the microwave suppressor 8;

[0051] The material system 4 continuously sends the material 3 into the freeze-drying bin 5;

[0052] The microwave system 7 feeds mi...

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Abstract

A continuous microwave freeze-drying devices comprises a vacuum water-trapping system (1), a microwave shield plate (2), a microwave bin (6) and a freeze-drying bin (5) located in the microwave bin (6), wherein the treeze-drying bin (5) comprises an upper bin opening, a left bin wall, a right bin wall and a bottom bin wall, and the left, right and bottom bin walls are all made from nonmetal wave transmitting materials, such as polyrfluortetrethylene, polyethylene, polypropylene or quartz glass. The device solves the technical problem of freeze-drying failure caused by glow discharge of microwave under freeze-drying environment.

Description

technical field [0001] The invention relates to the technical field of freeze-drying equipment, in particular to a continuous freeze-drying device using microwaves as a heat source. Background technique [0002] Freeze-drying technology is a method of freezing the water-containing material first, and then directly converting the moisture in the material from the solid phase to the gas phase in a high vacuum environment to obtain a dry product, also known as sublimation drying. The traditional freeze-drying method generally uses a hot plate or an infrared radiation plate to provide sublimation heat, which is widely used in food, medicine, new material processing and other fields, but its drying rate is low, the cycle is long, the equipment is complicated, the manufacturing cost is high, and the power consumption is high. Huge, seriously restricting the further development of freeze-drying technology. [0003] Microwave freeze-drying is a new technology that combines high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B15/18F26B7/00
CPCF26B3/347F26B5/042F26B5/048F26B5/06
Inventor 周川刘朝辉刘毅康琪游俊周昆
Owner SICHUAN HOPE MICROWAVE SCI & TECH
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