CN100418446C - Method for diminishing food temperature return during vacuum-cooling and pressure recovery - Google Patents
Method for diminishing food temperature return during vacuum-cooling and pressure recovery Download PDFInfo
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- CN100418446C CN100418446C CNB2006100235869A CN200610023586A CN100418446C CN 100418446 C CN100418446 C CN 100418446C CN B2006100235869 A CNB2006100235869 A CN B2006100235869A CN 200610023586 A CN200610023586 A CN 200610023586A CN 100418446 C CN100418446 C CN 100418446C
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- vacuum
- cooling
- pressure recovery
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Abstract
The present invention discloses a method for diminishing food temperature return during vacuum cooling and pressure recovery. The present invention is characterized in that after an air charging valve used for pressure recovery is opened, charged air is firstly cooled through a cooling device and then is charged into a vacuum tank; in order to save cost, the cooling device can directly adopt a water trap of the existing vacuum cooling device, an interface of the air charging valve is connected with the water trap, and thus, the charged air by the air charging valve is cooled by the water trap and then is charged into the vacuum tank. When the operation is specifically arranged, the interface of the air charging valve can be positioned near an extracting opening of a vacuum pump on the water trap. Because the design proposal is adopted, the air which is charged by the air charging valve is cooled by the water trap and then is charged into the vacuum tank, which diminishes temperature return of food during pressure recovery. The present invention has the advantages of easy operation and low cost, and is especially suitable to the process of vacuum precooling which demands lower final temperature of precooling for food.
Description
Technical field
The present invention relates to the food preservation technical field, particularly vacuum cooling technology field, especially a kind of method of diminishing food temperature return during vacuum-cooling and pressure recovery.
Background technology
In the vacuum cooled process, when food reaches precooling end-temperature, stop to bleed, open the multiple pressure of charge valve inflation.In inflating again the pressure process, because extraneous air is much larger than the food that has been cooled, and the speed of inflation is very fast, and gas and food have carried out the strong convection heat exchange, make the temperature of food go up the requirement that does not reach precooling end-temperature again to some extent.If precooling end-temperature is than higher food, can consider to be cooled to be lower than the certain numerical value of precooling end-temperature, inflation is multiple again presses, though can play the influence that part is eliminated temperature rise, but because the strong convection heat exchange of short time, be difficult to guarantee the even of heat exchange, make certain part of part food or food cross cold or overheated.In like manner, if the lower food of precooling end-temperature then can cause certain part of part food or food to damage to plants caused by sudden drop in temperature.
And at present in the vacuum cooled process, employed vacuum cooling equipment mainly comprises vacuum tank, water vessel, refrigeration unit, vavuum pump etc., wherein water vessel is divided into two kinds of built-in and externals, and built-in water vessel places in the vacuum tank, and the external water vessel places outside the vacuum tank.Because refrigeration unit is moved in the whole precooling process, provides cold to water vessel always, so the temperature in the water vessel presses the stage generally lower at vacuum chamber again.
Summary of the invention
The objective of the invention is in order to solve above-mentioned the deficiencies in the prior art part, and a kind of method of diminishing food temperature return during vacuum-cooling and pressure recovery is provided, this method can be so that inflation press the temperature rise of stage food to reduce again.
Purpose of the present invention is realized by following technical scheme:
A kind of method of diminishing food temperature return during vacuum-cooling and pressure recovery is characterized in that: after opening for the charge valve of pressing usefulness again, the air that benefit is gone into by after the cooling device cooling, charges in the vacuum tank earlier again.
In order to save cost, cooling device can directly adopt the water vessel of existing vacuum cooling equipment, and the inflation inlet of charge valve is communicated with water vessel, after the air that charges into of charge valve passes through water vessel and cools off like this, charges in the vacuum tank again.
When concrete the layout, can be with the close bleeding point of vavuum pump on water vessel of the interface of charge valve, the flow direction of the gas that charges in water vessel is just in time opposite with the bleed gas flow in stage of vavuum pump, makes that the gas that charges into is cooled off fully, carries out heat exchange with food again.
Owing to adopted design as above, the air that charge valve charges into is mended in the vacuum tank again, thereby is reduced food at the temperature recovery of pressing the stage again through the water vessel cooling.The advantage that the present invention has is easy to operate, cost is low.It is specially adapted to require in the lower food vacuum precooling of precooling end-temperature.
Description of drawings
Accompanying drawing is the schematic diagram of the method vacuum cooling equipment that specific embodiment uses of diminishing food temperature return during vacuum-cooling and pressure recovery of the present invention.
In the accompanying drawing: 1 is vacuum tank, and 2 is refrigeration unit, and 3 is water vessel, and 4 is vavuum pump, and 41 is the bleeding point of vavuum pump, and 5 is vacuum valve, and 6 is charge valve, and 61 is the interface of charge valve.
The specific embodiment
Feature of the present invention and other correlated characteristics are described in further detail by embodiment below in conjunction with accompanying drawing, so that technical staff's of the same trade understanding.
Referring to accompanying drawing, water vessel 3 places in the vacuum tank 1 in the vacuum cooling equipment of this specific embodiment, vavuum pump 4 is communicated with water vessel 3 by vacuum valve 5, for pressing the charge valve 6 of usefulness to be installed on the casing of vacuum tank 1 again, and be communicated with water vessel 3, interface 61 is near the bleeding points 41 of vavuum pump 4 on water vessel 3.
In this vacuum cooling equipment running, when the food in the vacuum tank 1 reaches precooling end-temperature, vavuum pump 4 out of service, close vacuum valve 5, open charge valve 6, outside air passes through charge valve 6 rapidly, enters water vessel 3, obtain cooling, the temperature of air descends to some extent, carries out heat exchange with vacuum tank 1 interior food again, and the pressure in vacuum tank 1 reaches ambient pressure, close charge valve 6 and refrigeration unit 2, whole vacuum cooled process finishes.
Learn by above, this method has utilized water vessel 3 coolings to press the air of usefulness again, and the air themperature that feasible and food carries out heat exchange descends, and has reduced the temperature recovery of food, the precooling effect that has improved has absolute front to help for long-term commercial operation and financial cost.
Certainly,, do not spend performing creative labour, on the basis of the foregoing description, can do multiple variation, can realize purpose of the present invention equally for one of ordinary skill in the art.But above-mentioned various variations obviously should be in the protection domain of claims of the present invention.
Claims (3)
1. the method for a diminishing food temperature return during vacuum-cooling and pressure recovery is characterized in that: after opening for the charge valve of pressing usefulness again, mend the air of going into earlier by after the water vessel cooling, charge in the vacuum tank.
2. the method for diminishing food temperature return during vacuum-cooling and pressure recovery as claimed in claim 1 is characterized in that: the interface of described charge valve is communicated with described water vessel.
3. the method for diminishing food temperature return during vacuum-cooling and pressure recovery as claimed in claim 2 is characterized in that: the close bleeding point of vavuum pump on described water vessel of the interface of described charge valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100235869A CN100418446C (en) | 2006-01-24 | 2006-01-24 | Method for diminishing food temperature return during vacuum-cooling and pressure recovery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2006100235869A CN100418446C (en) | 2006-01-24 | 2006-01-24 | Method for diminishing food temperature return during vacuum-cooling and pressure recovery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1803036A CN1803036A (en) | 2006-07-19 |
| CN100418446C true CN100418446C (en) | 2008-09-17 |
Family
ID=36865291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2006100235869A Expired - Fee Related CN100418446C (en) | 2006-01-24 | 2006-01-24 | Method for diminishing food temperature return during vacuum-cooling and pressure recovery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100418446C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111066877A (en) * | 2018-10-22 | 2020-04-28 | 中国科学院理化技术研究所 | Vacuum precooling system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2492815Y (en) * | 2001-08-22 | 2002-05-22 | 康景隆 | Continuous vacuum freeze drier |
| CN2599493Y (en) * | 2003-02-18 | 2004-01-14 | 上海鲜绿真空保鲜设备有限公司 | Dual-purpose equipment for vacuum cooling and drying |
-
2006
- 2006-01-24 CN CNB2006100235869A patent/CN100418446C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2492815Y (en) * | 2001-08-22 | 2002-05-22 | 康景隆 | Continuous vacuum freeze drier |
| CN2599493Y (en) * | 2003-02-18 | 2004-01-14 | 上海鲜绿真空保鲜设备有限公司 | Dual-purpose equipment for vacuum cooling and drying |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1803036A (en) | 2006-07-19 |
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