CN109140859B - Quick-freezing precooling device and quick-freezing precooling method - Google Patents
Quick-freezing precooling device and quick-freezing precooling method Download PDFInfo
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- CN109140859B CN109140859B CN201810972581.3A CN201810972581A CN109140859B CN 109140859 B CN109140859 B CN 109140859B CN 201810972581 A CN201810972581 A CN 201810972581A CN 109140859 B CN109140859 B CN 109140859B
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- quick
- precooling
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- freezing
- temperature
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- 238000007710 freezing Methods 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims description 20
- 230000008014 freezing Effects 0.000 claims abstract description 17
- 238000001816 cooling Methods 0.000 claims description 19
- 239000000523 sample Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 4
- 230000000630 rising effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 82
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 42
- 229910052757 nitrogen Inorganic materials 0.000 description 21
- 239000007788 liquid Substances 0.000 description 8
- 235000012055 fruits and vegetables Nutrition 0.000 description 6
- 238000004321 preservation Methods 0.000 description 6
- 208000001034 Frostbite Diseases 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000004378 air conditioning Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D3/00—Devices using other cold materials; Devices using cold-storage bodies
- F25D3/10—Devices using other cold materials; Devices using cold-storage bodies using liquefied gases, e.g. liquid air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
The invention discloses a quick-freezing precooling device, which comprises: the quick-freezing device is used for quick-freezing the object to be quick-frozen; the precooling device comprises a precooling chamber and an air inlet, wherein the precooling chamber receives air exhausted from the quick-freezing device to the air inlet and precools an object to be precooled from top to bottom by utilizing the air; and a temperature raising device for raising the temperature by mixing with the high-temperature gas when the temperature of the gas discharged from the quick freezing device is lower than a preset temperature. The invention has the beneficial effects that: according to the quick-freezing precooling device, the low-temperature gas discharged by the quick-freezing device is used for precooling, so that the energy utilization rate is improved.
Description
Technical Field
The invention relates to the technical field of quick-freezing and refrigerating, in particular to a quick-freezing and pre-cooling device and a quick-freezing and pre-cooling method.
Background
In the prior art, a liquid nitrogen quick freezer is mostly used for quick freezing of products, and the principle is that liquid nitrogen is sprayed on the surfaces of the products, the liquid nitrogen is evaporated into nitrogen, and the temperature of the surfaces of the products is absorbed, so that the products are frozen rapidly. The liquid nitrogen quick-freezing has the advantages of short quick-freezing time, thorough quick-freezing, small equipment volume, small loss of food flavor, sanitation and the like, and the temperature of the product is reduced to below-18 ℃ only for half an hour or even a few minutes.
In the prior art, the evaporated nitrogen is directly discharged outside the machine, but the temperature of the nitrogen discharged by the part is lower, and the nitrogen is directly discharged into the air, so that waste is not caused.
For the problems in the related art, no effective solution has been proposed at present.
Disclosure of Invention
Aiming at the technical problems in the related art, the invention provides a quick-freezing precooling device and a quick-freezing precooling method, which are used for recycling gas exhausted by the quick-freezing device.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
a quick-freeze precooling apparatus comprising: the quick-freezing device is used for quick-freezing the object to be quick-frozen; the precooling device comprises a precooling chamber and an air inlet, wherein the precooling chamber receives air exhausted from the quick-freezing device to the air inlet and precools an object to be precooled from top to bottom by utilizing the air; and a temperature raising device for raising the temperature by mixing with the high-temperature gas when the temperature of the gas discharged from the quick freezing device is lower than a preset temperature.
Preferably, the temperature raising device comprises a high-temperature gas inlet arranged beside the air inlet and an electromagnetic valve for controlling the opening and closing of the high-temperature gas inlet.
Preferably, the device further comprises a temperature probe arranged at the gas inlet and used for detecting the temperature of the gas at the gas inlet.
Preferably, the high temperature gas is air.
Preferably, the device further comprises a circulating device, so that the gas after precooling the object to be precooled flows to the object to be precooled again.
Preferably, the precooling apparatus further comprises a gas discharge device for discharging the gas flowing again to the precooling object to the outside of the precooling apparatus when the temperature of the gas is higher than a predetermined temperature.
Preferably, the gas discharge device comprises a gas outlet arranged at the bottom of the precooling device and an electromagnetic valve for controlling the opening and closing of the gas outlet.
Preferably, the circulating means comprises a return air fan and a gas passage,
the air return fan enables air after precooling the object to be precooled to enter the air channel and flow from bottom to top, and the air channel is communicated with the air inlet.
Preferably, the pressure relief device is further included, and the pressure relief is performed by means of exhausting gas when the pressure in the precooling device is higher than a preset value.
Preferably, a plurality of loading devices capable of allowing the gas to pass through are arranged in the pre-cooling chamber.
In another aspect of the present invention, a quick-freezing precooling method is provided, comprising the steps of: the gas after quick-freezing the object to be quick-frozen flows to the object to be pre-cooled, and the object to be pre-cooled is pre-cooled from top to bottom; if the gas temperature after quick-freezing the object to be quick-frozen is lower than a preset value, the object to be pre-cooled is heated by mixing with high-temperature gas and then flows to the object to be pre-cooled.
Preferably, the method further comprises the following steps: the gas after precooling the object to be precooled flows from bottom to top, and flows to the object to be precooled after being mixed with the gas after quick-freezing the object to be quick-frozen.
Preferably, the method further comprises the following steps: and if the temperature of the gas after precooling the object to be precooled is higher than a preset value, discharging the gas after precooling the object to be precooled.
The invention has the beneficial effects that: according to the quick-freezing precooling device and the quick-freezing precooling method, the low-temperature gas discharged after quick freezing is used for precooling, so that the energy utilization rate is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of a precooling apparatus according to an embodiment of the present invention;
fig. 2 is a flowchart of a quick-freezing precooling method according to an embodiment of the present invention;
fig. 3 is a flowchart of another embodiment of a quick-freezing precooling method according to an embodiment of the present invention.
In the figure: 1. a precooling device; 10. a pre-cooling chamber; 11. a mounting device; 12. an air inlet; 13. an air intake fan; 14. a high temperature gas inlet; 15. an air inlet temperature probe; 16. an air return fan; 17. a gas channel; 18. a return air port temperature probe; 19. an exhaust port; 20. a thermal insulation cabinet body; 21. a pressure release valve; 30. and an electric control cabinet.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which are derived by a person skilled in the art based on the embodiments of the invention, fall within the scope of protection of the invention.
Fig. 1 is a schematic structural view of a precooling apparatus according to the present invention.
As shown in fig. 1, a quick-freezing precooling apparatus according to an embodiment of the present invention includes: a quick-freezing device (not shown) for quick-freezing the object to be quick-frozen; the precooling device 1 comprises a precooling chamber 10 and an air inlet 12, wherein the precooling chamber 10 receives air discharged from the quick-freezing device to the air inlet 12 and precools an object to be precooled from top to bottom by utilizing the air; and a temperature raising device for raising the temperature by mixing with the high-temperature gas when the temperature of the gas discharged from the quick freezing device is lower than a predetermined temperature. The quick freezing device is, for example, a liquid nitrogen quick freezing machine, the temperature of an object to be quick frozen (such as aquatic products and the like) can be reduced to below-18 ℃, the liquid nitrogen absorbs the heat of the object to be quick frozen so as to be evaporated into nitrogen, the temperature of the nitrogen is still very low, and the nitrogen is also of value to be utilized, so that the nitrogen discharged by the liquid nitrogen quick freezing machine enters the precooling device, and the object to be precooled (such as fruits and vegetables and the like) in the precooling device is precooled.
The precooling apparatus 1 includes, for example, a precooling chamber 10 disposed in a heat-preserving cabinet 20, a plurality of loading devices 11 capable of allowing air to pass through are disposed in the precooling chamber 10, the loading devices 11 are, for example, perforated rubber frames, and the objects to be precooled are placed on the loading devices 11. An air inlet 12 is formed in the top of the heat preservation cabinet 20, the air inlet 12 is communicated with an exhaust pipe of the quick-freezing device, and nitrogen exhausted by the quick-freezing device enters the pre-cooling device 1 from the air inlet 12 and flows from top to bottom to pre-cool a pre-cooled object. An air inlet fan 13 is arranged at the air inlet 12, and the flow speed of nitrogen is increased under the action of the air inlet fan 13, so that the precooling can be performed more rapidly.
Because the temperature of the gas discharged from the quick-freezing device is still low, and there is a risk of frostbite of the precooled material, the precooling device 1 further comprises a temperature raising device, and when the temperature of the gas discharged from the quick-freezing device is lower than a predetermined temperature, the temperature is raised by mixing with the high-temperature gas.
Specifically, a high-temperature gas inlet 14 and an inlet temperature probe 15 are also provided near the inlet 12, and the opening and closing of the high-temperature gas inlet 14 is controlled by an electromagnetic valve. The air inlet temperature probe 15 detects the temperature of the air discharged by the quick freezing device, and when the temperature is lower than a preset temperature, the high-temperature air inlet 14 is opened to enable the high-temperature air to enter and be mixed with low-temperature nitrogen, so that the temperature is increased, and the objects to be precooled are prevented from being frosted. As a preferred embodiment, a chamber may be further provided near the gas inlet 12, and the gas flowing out from the gas inlet 12 and the high-temperature gas inlet 14 may first enter the chamber, so that the two gases are fully mixed and the temperature is stabilized, and then enter the pre-cooling device 1. The high temperature gas is preferably air, and the air outside is allowed to enter after the high temperature gas inlet 14 is opened.
The gas temperature after the pre-cooling object is pre-cooled for one time is still lower, and the gas can be reused. For this purpose, the precooling apparatus 1 further includes a circulation device, so that the gas precooled by the object to be precooled flows again to the object to be precooled.
Specifically, the circulation device includes an air return fan 16 and an air channel 17, the air return fan 16 makes the air after pre-cooling the pre-cooled object enter the air channel 17, and the air channel 17 is communicated with the position (i.e. the air inlet 12) where the air is discharged from the quick freezing device. The return air fan 16 is disposed at the bottom of the heat-preserving cabinet 20, the air channel 17 is also disposed in the heat-preserving cabinet 20 and is separated from the pre-cooling chamber 10 by a partition plate, and a metal mesh plate (the position indicated by the dotted line in the figure) is disposed on the partition plate at the position corresponding to the return air fan 16 and the intake air fan 13 for circulating air. That is, the air discharged from the freezing device firstly enters the air passage 17, enters the pre-cooling chamber 10 under the action of the air inlet fan 13, flows downwards to the bottom of the pre-cooling chamber 10, enters the air passage 17 under the action of the air return fan 16, flows upwards to the top of the air passage 17, and enters the pre-cooling chamber 10 again to complete one cycle. The gas after the pre-cooling object is pre-cooled for one time can be mixed with the gas just discharged from the quick freezing device at the top of the gas channel 17, so that the temperature of the gas just discharged from the quick freezing device is prevented from being too low.
As the number of cycles increases, the temperature of the gas gradually increases, and the pre-cooling effect decreases, so that it is necessary to discharge a part of the gas at an appropriate timing. For this purpose, the precooling apparatus 1 further includes a gas discharge device that discharges the gas flowing again to the object to be precooled out of the precooling apparatus when the temperature of the gas is higher than a predetermined temperature.
Specifically, a return air port temperature probe 18 and an exhaust port 19 are provided near the return air fan 16, and opening and closing of the exhaust port 19 is controlled by an electromagnetic valve, and when the return air port temperature probe 18 detects that the temperature is higher than a predetermined temperature, the exhaust port is opened, and the gas is discharged from the exhaust port 19 and no longer flows upward.
In addition, since the air inlet 12 always has air flowing in, the pressure in the heat preservation cabinet 20 will gradually increase, so the pressure release valve 21 is also provided on the heat preservation cabinet 20, the air pressure gauge is provided in the heat preservation cabinet 20, when the pressure in the heat preservation cabinet 20 is higher than the preset value, the pressure release valve 21 is opened, and the air is discharged to release the pressure.
An electric control cabinet 30 is arranged above the heat preservation cabinet body 20, is connected with each electric element, receives data of each measuring element (the air inlet temperature probe 15, the air return port temperature probe 18 and the barometer) and controls opening and closing of each valve according to the data.
The quick-freezing precooling method of the invention is described below.
Fig. 2 is a flowchart of a quick-freezing precooling method according to an embodiment of the present invention.
The quick-freezing precooling method provided by the invention comprises the following steps: the gas after quick-freezing the object to be quick-frozen flows to the object to be pre-cooled, and the object to be pre-cooled is pre-cooled from top to bottom; if the gas temperature after quick-freezing the object to be quick-frozen is lower than a preset value, the object to be pre-cooled is heated by mixing with high-temperature gas and then flows to the object to be pre-cooled.
Specifically, for example, quick freezing agent (liquid nitrogen) is used to quick freeze the object to be quick frozen (S1), then the quick freezing agent is evaporated into gas (nitrogen), the temperature of the gas is detected (S2), if the temperature is lower than a preset temperature, the risk of frostbite of the object to be pre-cooled is indicated, at this time, the gas is mixed with high-temperature gas, the temperature is raised (S2.1), and after that, the mixed gas is allowed to flow to the object to be pre-cooled (S3). If the detected gas temperature in the step S2 is higher than or equal to the preset temperature, the step S2.1 is skipped, the gas is directly led to flow to the object to be precooled (S3), and the object to be precooled is precooled from top to bottom.
Fig. 3 is a flowchart of another embodiment of a quick-freezing precooling method according to an embodiment of the present invention.
On the basis of the embodiment, the method further comprises the following steps: the gas after precooling the object to be precooled flows from bottom to top, and flows to the object to be precooled after being mixed with the gas after quick-freezing the object to be quick-frozen.
Specifically, the temperature of the gas after pre-cooling the object to be pre-cooled from top to bottom is raised, so that the part of the gas flows upwards, and is mixed with the gas after quick-freezing the object to be pre-frozen (S4.1), the step S2 is executed again, and the gas flows to the object to be pre-cooled again. The step can prevent the gas temperature after quick-freezing the object to be quick-frozen from being too low and frostbite the object to be pre-cooled on the one hand, and enables the gas to be recycled for multiple times on the other hand, so that the efficiency is improved.
The method comprises the following steps of: detecting the gas temperature after precooling the object to be precooled (S3.1), and discharging (all or part of) the gas after precooling the object to be precooled if the gas temperature after precooling the object to be precooled is higher than a preset value (S4.2). This step can prevent the gas from becoming too high after circulating several times, thereby reducing the pre-cooling effect.
In summary, the quick-freezing precooling device and the quick-freezing precooling method provided by the invention utilize low-temperature gas (nitrogen) discharged by the quick-freezing device, so that the energy consumption efficiency of the quick-freezing device is improved. The quick-freezing device can reduce the temperature of aquatic products and fruits and vegetables to below-18 ℃ and store the aquatic products and fruits and vegetables in the freezing chamber, and the precooling device can reduce the temperature of fruits and vegetables to 0-10 ℃ and store the fruits and vegetables in the refrigerating chamber. In addition, the temperature of the normal-temperature air-conditioning low-temperature gas is introduced, so that the gas with uncontrollable temperature is changed into the precooling gas with controllable temperature, the accurate precooling is realized, and the fruits and vegetables are prevented from being frostbitten.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (11)
1. A quick-freezing precooling apparatus, characterized by comprising:
the quick-freezing device is used for quick-freezing the object to be quick-frozen;
the precooling device comprises a precooling chamber and an air inlet, wherein the precooling chamber receives air exhausted from the quick-freezing device to the air inlet and precools an object to be precooled from top to bottom by utilizing the air; the method comprises the steps of,
a temperature raising device for raising the temperature by mixing with high temperature gas when the temperature of the gas discharged from the quick freezing device is lower than a preset temperature,
the temperature rising device comprises a high-temperature gas inlet arranged beside the air inlet and an electromagnetic valve for controlling the opening and closing of the high-temperature gas inlet,
the gas inlet temperature probe is arranged at the gas inlet and is used for detecting the temperature of gas at the gas inlet.
2. The quick-freezing precooling apparatus as claimed in claim 1, characterized in that,
the high temperature gas is air.
3. The quick-freezing precooling apparatus as claimed in claim 1, characterized in that,
the device also comprises a circulating device, so that the gas after precooling the object to be precooled flows to the object to be precooled again.
4. The quick-freezing precooling apparatus as claimed in claim 3, characterized in that,
the device also comprises a gas discharge device, and when the temperature of the gas flowing to the pre-cooling object is higher than the preset temperature, the gas is discharged out of the pre-cooling device.
5. The quick-freezing precooling apparatus as claimed in claim 4, characterized in that,
the gas discharge device comprises an exhaust port arranged at the bottom of the precooling device and an electromagnetic valve for controlling the opening and closing of the exhaust port.
6. The quick-freezing precooling apparatus as claimed in claim 3, characterized in that,
the circulating device comprises an air return fan and a gas channel,
the air return fan enables air after precooling the object to be precooled to enter the air channel and flow from bottom to top, and the air channel is communicated with the air inlet.
7. The quick-freezing precooling apparatus as claimed in claim 1, characterized in that,
the pressure release device is used for releasing pressure in a mode of exhausting gas when the pressure in the precooling device is higher than a preset value.
8. The quick-freezing precooling apparatus as claimed in claim 1, characterized in that,
a plurality of carrying devices capable of allowing gas to pass through are arranged in the pre-cooling chamber.
9. A quick-freezing precooling method using the quick-freezing precooling apparatus as claimed in claim 1, characterized by comprising the steps of:
the gas after quick-freezing the object to be quick-frozen flows to the object to be pre-cooled, and the object to be pre-cooled is pre-cooled from top to bottom; wherein,,
if the gas temperature after quick-freezing the object to be quick-frozen is lower than a preset value, the object to be pre-cooled is flowed after the temperature is raised by mixing with high-temperature gas.
10. The quick-freeze precooling method as claimed in claim 9, further comprising the steps of:
the gas after precooling the object to be precooled flows from bottom to top, and flows to the object to be precooled after being mixed with the gas after quick-freezing the object to be quick-frozen.
11. The quick-freeze precooling method as claimed in claim 10, further comprising the steps of:
and if the temperature of the gas after precooling the object to be precooled is higher than a preset value, discharging the gas after precooling the object to be precooled.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810972581.3A CN109140859B (en) | 2018-08-24 | 2018-08-24 | Quick-freezing precooling device and quick-freezing precooling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810972581.3A CN109140859B (en) | 2018-08-24 | 2018-08-24 | Quick-freezing precooling device and quick-freezing precooling method |
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| CN109140859A CN109140859A (en) | 2019-01-04 |
| CN109140859B true CN109140859B (en) | 2023-10-27 |
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| CN113970941A (en) * | 2020-07-22 | 2022-01-25 | 青岛海尔生物医疗科技有限公司 | Program cooling instrument and cooling method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2231722C2 (en) * | 2002-12-26 | 2004-06-27 | Общество с ограниченной ответственностью "Темп-11" | Line for bird carcasses cold treatment |
| CN104697263A (en) * | 2015-03-10 | 2015-06-10 | 王琰 | Self-prefreezing liquid nitrogen tunnel quick freezer |
| CN104886234A (en) * | 2015-06-30 | 2015-09-09 | 温州科技职业学院 | Liquid nitrogen precooling device for fruits and vegetables |
| CN206760625U (en) * | 2017-03-22 | 2017-12-19 | 徐州市海涛制冷设备有限公司 | Pump ring continous way fruit and vegetable drying precooling freeze tunnel |
| CN209131213U (en) * | 2018-08-24 | 2019-07-19 | 顺启和(深圳)科技有限公司 | Quick-frozen pre-cooler |
-
2018
- 2018-08-24 CN CN201810972581.3A patent/CN109140859B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2231722C2 (en) * | 2002-12-26 | 2004-06-27 | Общество с ограниченной ответственностью "Темп-11" | Line for bird carcasses cold treatment |
| CN104697263A (en) * | 2015-03-10 | 2015-06-10 | 王琰 | Self-prefreezing liquid nitrogen tunnel quick freezer |
| CN104886234A (en) * | 2015-06-30 | 2015-09-09 | 温州科技职业学院 | Liquid nitrogen precooling device for fruits and vegetables |
| CN206760625U (en) * | 2017-03-22 | 2017-12-19 | 徐州市海涛制冷设备有限公司 | Pump ring continous way fruit and vegetable drying precooling freeze tunnel |
| CN209131213U (en) * | 2018-08-24 | 2019-07-19 | 顺启和(深圳)科技有限公司 | Quick-frozen pre-cooler |
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