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Rapid freezing-defreezing circulator

A circulator, fast technology, applied in the field of circulator, can solve the problems of damage, environmental pollution, long freeze-thaw cycle, etc.

Inactive Publication Date: 2007-08-08
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of a single medium is that there is always a link in each cycle with low heat exchange efficiency: the freezing-thawing method in the air medium has low thawing efficiency and a long freezing-thawing cycle; a single use of water medium, although there is no environmental pollution problem, but The water medium releases a lot of heat during the freezing process and absorbs a lot of heat during the thawing process, so the efficiency is also low; the single use of oil medium, one is low efficiency, which is the same as the previous two cases, and the other is oil The medium is fluorescent, so it is not suitable for sample processing that needs to detect the fluorescence spectrum; there are two problems with antifreeze, one is the low efficiency, in the past, the antifreeze was completely placed in the sample chamber, and the two processes of freezing and thawing required additional energy. Therefore, the efficiency of freezing and thawing is greatly reduced. The second is to cause environmental pollution. The antifreeze used in the past is basically ethylene glycol water antifreeze. Ethylene glycol has certain toxicity and is harmful to the kidneys, liver, stomach, and intestines of the human body. Road and other internal organs have damage
[0003] In short, in a circulator that performs freezing-thawing in a single water medium, oil medium or antifreeze medium, the efficiency of freezing and thawing is low, which increases the energy consumption of heating or cooling the medium, and the freezing-thawing cycle is long; At the same time, the use of antifreeze will also pollute the environment, which is the most unfavorable design scheme.

Method used

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  • Rapid freezing-defreezing circulator

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] Example 1: Fragmentation experiments were carried out on rock samples to reproduce the geological process of physical weathering in nature.

[0023] The sample size is assumed to be 2 kg.

[0024] According to the climatic conditions on the earth's surface, the minimum temperature is set at -30°C and the maximum temperature is 40°C when simulating the frigid zone; the minimum temperature is set at -10°C and the maximum temperature is 50°C when simulating the temperate zone. The freeze cycle is 10 hours and the heat cycle is 2 hours. The period of water medium filling into the freezing thermostat is 8 minutes, and the period of pumping out from the freezing thermostat controller is 2 minutes. Complete two freeze-thaw cycles a day.

example 2

[0025] Example two: improve the technology of resistant starch content in sweet potato starch.

[0026] Weigh a certain amount of experimental starch, disperse it in water, and prepare 500 ml of starch milk with a certain concentration, adjust the pH to be neutral, stir in a water bath at 100°C at a speed of 130 rpm for 30 minutes, and take it out after gelatinization is complete. , cooled to room temperature under normal pressure, then placed in a refrigerator at 4°C for aging for a certain period of time, then repeatedly frozen-thawed in the fully automatic freeze-thawer of the present invention, the aged starch glue was vacuum-dried, pulverized , which is resistant starch.

[0027] Freezing-thawing cycle setting: the lowest temperature is -20°C, the highest temperature is 60°C; the freezing cycle is 5 hours, the heating cycle is 1 hour; the water medium is poured into the freezing thermostat for 8 minutes, and the self-refrigerating thermostat controller The pumping cycle ...

example 3

[0028] Example 3: Effect of freezing-thawing cycle on animal protein denaturation.

[0029] Put 500 grams of animals (such as fish) in a freeze-thaw cycler, set the minimum temperature to -20°C, and the maximum temperature to 10°C; the freezing cycle is 18 hours, and the thawing cycle is 6 hours; The perfusion cycle of the device is 10 minutes, and the pumping cycle from the refrigeration thermostat controller is 4 minutes. Complete 1 freeze-thaw cycle a day.

[0030] As the number of freezing-thawing cycles increases, animal protein is denatured, so repeated freezing-thawing should be avoided during processing to ensure the quality of animal food.

[0031] Other application fields of the present invention include: (1) In the study of geochronology, the purity of clay minerals is improved by crushing samples through freezing and thawing cycles. (2) In the field of chemical industry, PVA / bentonite hybrid hydrogels were prepared by freezing-thawing method; under critical condi...

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PUM

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Abstract

The invention relates to a circulator for freezing and defreezing the material, comprising an automatic controller (01), a heating thermostat (02), and a freezing thermostat (03). The material container (25) is in the freezing thermostat (03) and periodically alternates the freezing and defreezing processes. The heating thermostat (02) heats the water medium and controls the temperature constantly. The automatic controller (01) controls the periods of freezing and defreezing, controls the circulation period of water, and the water level in the heating thermostat (02) and freezing thermostat (03). The invention can freeze material in air, defreeze material in circulated water medium, and alternatively process the freezing and defreezing, while the periods can be set. The invention has high efficiency and wide application.

Description

technical field [0001] The invention relates to a circulator for freezing and thawing materials. Background technique [0002] In the prior art, the freezing-thawing of materials generally adopts the method of heat exchange in various media such as air, water, oil or antifreeze, such as the heating and refrigeration circulator produced by a German company, the common The characteristics are all using a single medium. The disadvantage of a single medium is that there is always a link in each cycle with low heat exchange efficiency: the freezing-thawing method in the air medium has low thawing efficiency and a long freezing-thawing cycle; a single use of water medium, although there is no environmental pollution problem, but The water medium releases a lot of heat during the freezing process and absorbs a lot of heat during the thawing process, so the efficiency is also low; the single use of oil medium, one is low efficiency, which is the same as the previous two cases, and ...

Claims

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Application Information

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IPC IPC(8): F25D31/00F25D29/00
Inventor 王龙樟王立云
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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