Modular continuous microwave freeze-drying chamber and microwave freeze-drying equipment containing said freeze-drying chamber

A technology of microwave freeze-drying and freeze-drying chamber, which is applied in the direction of lighting and heating equipment, drying, drying machine, etc. It can solve the problems of uneven distribution of microwave field, inability to provide sufficient shear stress, and affect freeze-drying effect. Achieve the effect of ensuring the uniformity of microwave loading, satisfying the increase of output and expanding production, and solving the difficulty of processing

Active Publication Date: 2017-05-17
周川
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to ensure that the connection between adjacent cavities is stable and avoid gaps at the seams, one idea is to use metal connectors with sufficient strength, such as bolts, to connect the warehouse wall to the microwave shielding plate, and the cavity to the cavity. However, metal bolts It will lead to uneven distribution of the microwave field in the microwave continuous freeze-drying device and affect the freeze-drying effect, and the replacement of non-metallic bolts cannot provide sufficient shear stress to resist the deformation of the two materials

Method used

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  • Modular continuous microwave freeze-drying chamber and microwave freeze-drying equipment containing said freeze-drying chamber
  • Modular continuous microwave freeze-drying chamber and microwave freeze-drying equipment containing said freeze-drying chamber
  • Modular continuous microwave freeze-drying chamber and microwave freeze-drying equipment containing said freeze-drying chamber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] The chamber body 1 is made of high-density polyethylene (HDPE) through an injection molding process, and the microwave shielding plate 2 is made of a 3A21 aluminum alloy through a cutting process. During the freeze-drying process, affected by the heat transfer of the freeze-dried raw materials, the temperature of the chamber body 1 and the microwave shielding plate 2 drops to 10°C, and the initial temperature is calculated as normal temperature of 25°C, with a temperature difference of 15°C.

[0061] In addition, the coefficient of linear expansion of the material is:

[0062] HDPE: 180×10 -6 / ℃

[0063] 3A21: 23.2×10 -6 / ℃

[0064] According to the single-direction length of a single modular microwave vacuum chamber of 1200mm, at a temperature difference of 15°C, the size of the gap caused by the inconsistent linear expansion coefficients of the two materials is:

[0065] (1200mm×15℃×180×10 -6 / ℃-1200mm×15℃×23.2×10 -6 / ℃) / 2=1.4mm

[0066] A solid elastic sealing...

Embodiment 2

[0073] The main compartment 1 is made of HDPE, and the microwave shielding plate 2 is made of SUS304 stainless steel. During the freeze-drying process, the temperature of the chamber body 1 and the microwave shielding plate 2 drops to 5°C, the initial temperature is calculated as normal temperature of 25°C, and the temperature difference is 20°C.

[0074] The linear expansion coefficient of HDPE is: 180×10 -6 / ℃

[0075] The linear expansion coefficient of SUS304 is: 17.2×10 -6 / ℃

[0076] Calculated according to the longest single-direction length of 1500mm of a single modular microwave vacuum cavity, at a temperature difference of 20°C, the size of the gap caused by the inconsistent linear expansion coefficients of the two materials is:

[0077] (1500mm×20℃×180×10 -6 / ℃-1500mm×20℃×17.2×10 -6 / ℃) / 2=2.44mm

[0078] A solid elastic sealing ring made of rubber, a silicone sealing ring with an internal pressure of 0.1mPA filled with nitrogen, a silicone sealing ring with an...

Embodiment 3

[0082] The same materials and operating parameters as in Example 2 were used, the difference being that the effectiveness of a longer modular microwave vacuum cavity was tested, and the length of a single cavity was 3000 mm. The calculated gap size is:

[0083] (3000mm×20℃×180×10 -6 / ℃-3000mm×20℃×17.2×10 -6 / ℃) / 2=4.88mm

[0084] Obviously, due to the increase in the length of a single cavity, the gap caused by the difference in linear expansion coefficient also increases significantly, which intensifies the difficulty of cavity sealing.

[0085]The influence of the silicone seal ring filled with He gas with an internal pressure of 0.5mPA and the silicone seal ring filled with He gas with an internal pressure of 1.2mPA on the vacuum degree and air leakage rate in the chamber were tested respectively, and the results are as follows:

[0086]

[0087] It can be seen that the air-filled sealing ring can meet the airtightness requirements of the freeze-drying chamber with a l...

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Abstract

The invention relates to a modularization continuous microwave freeze-drying cavity which comprises a chamber body and a shielding plate. A boss part is arranged in the middle of the shielding plate, and body sealing ring grooves are formed in the four sides of the boss part. A shielding plate installation channel is formed in the middle of the bottom face of the chamber body. Grooves are formed in the two ends of the outer surface of the chamber body in the length direction of the chamber body, and positioning pin assembling holes are formed in the grooves. Adjacent sealing ring grooves are formed in the part, around the hollow structure, of one side end face of the chamber body. By means of the modularization continuous microwave freeze-drying cavity, the temperature change deformation difference caused by inconformity of coefficients of linear expansion between a freeze-drying bin made of nonmetal wave-transmitting materials and the microwave shielding plate made of metal materials is effectively overcome, and the vacuum sealing performance is ensured; a metal connecting piece between a chamber body and a shielding plate in the conventional technology is removed, and the microwave loading uniformity in the freeze-drying process is ensured; assembling is achieved through modularization design, and the requirements for increasing the yield and expanding production are effectively met.

Description

[0001] 【Technical field】 [0002] The invention relates to microwave freeze-drying equipment, in particular to a modularized continuous microwave freeze-drying chamber applied to continuous microwave freeze-drying equipment, and the continuous microwave freeze-drying equipment containing the freeze-drying chamber. [0003] 【Background technique】 [0004] Microwave freeze-drying is a combination of microwave radiation heating technology and vacuum freeze-drying technology. By improving the way of providing latent heat of sublimation in the conventional freeze-drying process, microwaves are used to heat the drying medium as a whole, and the polar molecules in the material are vibrated under the microwave field. And friction with each other, so that the electric energy is converted into the latent heat of sublimation required for the sublimation of water in the material, and the material is dried. Compared with the traditional freeze-drying method, microwave freeze-drying has the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F26B7/00F26B23/08
Inventor 周川刘毅游俊康琪周昆姚波周聪
Owner 周川
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