CN114198958A - Jet type liquid nitrogen deep-cooling instant freezer and use method thereof - Google Patents
Jet type liquid nitrogen deep-cooling instant freezer and use method thereof Download PDFInfo
- Publication number
- CN114198958A CN114198958A CN202111419029.XA CN202111419029A CN114198958A CN 114198958 A CN114198958 A CN 114198958A CN 202111419029 A CN202111419029 A CN 202111419029A CN 114198958 A CN114198958 A CN 114198958A
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- Prior art keywords
- liquid nitrogen
- temperature
- air injection
- heat preservation
- electric control
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Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 146
- 239000007788 liquid Substances 0.000 title claims abstract description 78
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 73
- 238000001816 cooling Methods 0.000 title claims abstract description 8
- 238000000034 method Methods 0.000 title claims description 16
- 238000002347 injection Methods 0.000 claims abstract description 50
- 239000007924 injection Substances 0.000 claims abstract description 50
- 238000004321 preservation Methods 0.000 claims abstract description 34
- 238000005507 spraying Methods 0.000 claims abstract description 22
- 230000001105 regulatory effect Effects 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 4
- 230000003111 delayed effect Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000009413 insulation Methods 0.000 abstract description 2
- 239000003814 drug Substances 0.000 description 2
- 229940079593 drug Drugs 0.000 description 2
- 238000007905 drug manufacturing Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Images
Classifications
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- 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
- F25D3/102—Stationary cabinets
-
- 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
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
-
- 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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
Abstract
The invention discloses a jet liquid nitrogen deep-cooling instant freezer which comprises six parts, namely a heat preservation box body, an electric control box part, an electric control system, an exhaust system, a jet system and a liquid nitrogen spraying system; the nozzle component of the liquid nitrogen spraying system is arranged in the air injection system, the insulation box body is arranged in the electric control box component, the electric control system is arranged in the electric control box component, and the exhaust system is arranged at the upper right end of the electric control box component.
Description
Technical Field
The invention relates to the technical field of instant freezers, in particular to a jet liquid nitrogen deep-cooling instant freezer and a using method thereof.
Background
The existing technical equipment is that low-temperature liquid nitrogen mist is vaporized in the whole incubator, some atomized liquid is sucked away by an exhaust fan without heat exchange with frozen products, energy is wasted, and the liquid nitrogen is directly sprayed on the frozen products and does not accord with the requirements of a drug production process, so that a brand-new instant freezer which can save energy and completely accord with the drug production process is needed.
Disclosure of Invention
The invention aims to provide a jet liquid nitrogen deep-cooling instant freezer and a using method thereof, and aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a jet type liquid nitrogen deep-cooling instant freezer is composed of a heat preservation box body, an electric control box part, an electric control system, an exhaust system, a jet system and a liquid nitrogen spraying system; the nozzle component of the liquid nitrogen spraying system is arranged in the gas injection system, the heat insulation box body is arranged in the electric control box component, the electric control system is arranged in the electric control box component, and the exhaust system is arranged at the upper right end of the electric control box component; the electric control system consists of a temperature controller, two frequency converters and a plurality of relay contactors; the exhaust system is composed of an exhaust pipe and an exhaust fan, and the exhaust fan is connected with the exhaust pipe through a flange.
Preferably, the liquid nitrogen spraying system consists of a low-temperature manual stop valve, a low-temperature liquid nitrogen electromagnetic valve, a pneumatic flow regulating valve, a safety valve, a Y-shaped filter, a liquid nitrogen conveying pipeline, a liquid nitrogen spraying pipe and a liquid nitrogen atomizing nozzle; the low-temperature manual stop valve, the low-temperature liquid nitrogen electromagnetic valve, the pneumatic flow regulating valve, the Y-shaped filter, the liquid nitrogen conveying pipeline, the liquid nitrogen spray pipe and the liquid nitrogen atomizing nozzle are sequentially connected into a whole by an SUS304 stainless steel pipe in series, and the safety valve is connected in parallel on a pipeline between the low-temperature manual stop valve and the liquid nitrogen electromagnetic valve.
Preferably, the air injection system consists of a long shaft motor, a vortex centrifugal fan blade, an air injection wind cylinder, an air guide pipe and an air injection box; the air injection air duct is fixed on an inner top plate of the air injection box by screws, the long shaft motor is fixed on an outer top plate of the air injection box, and a long shaft of the long shaft motor penetrates into the air injection box through a through hole reserved on the air injection box; the vortex centrifugal fan blade is fixed on a shaft head of the long shaft motor; the air injection air cylinder covers the outer surface of the vortex centrifugal fan blade; the air injection wind barrel, the air guide pipe and the air injection box are welded together.
Preferably, the heat preservation box body and the heat preservation door form a container for keeping a low-temperature environment; the heat preservation door is connected with the heat preservation box body through a hinge; a low-temperature resistant sealing strip is inlaid on the heat-insulating door; the heat preservation door is supported by two air springs, and the lower part of the heat preservation door is locked with the heat preservation box body by a locking nut.
Preferably, the using method comprises the following steps:
A. firstly, a power supply is switched on, each part is electrified for self-checking, a liquid supply electromagnetic valve is electrified in a delayed mode through time relay, a long shaft motor of an air injection system is started, and a temperature controller is bolted to the current actual temperature in a heat preservation box through a temperature sensor PT 100;
B. calculating the difference between the set temperature and the set temperature required by the work through a CPU in the air conditioner, performing proportional calculation, and outputting a control signal of 4-20 ma to a pneumatic flow regulating valve and a control frequency converter to regulate the opening degree of the flow and the rotating speed of a long shaft motor;
C. when the difference between the PV value of the process temperature (namely the actual temperature) and the SV value of the set temperature is large, the control current output by the temperature controller is large, so that the opening degree of the pneumatic flow control valve is increased, more liquid nitrogen is supplied, the temperature reduction is accelerated, the rotating speed of the vortex centrifugal fan blade is increased, a large amount of vaporized gas is discharged, and the actual temperature is quickly close to the set temperature;
D. when the actual temperature is close to the set temperature, the temperature control CPU gives a corresponding signal, the opening degree of the pneumatic flow regulating valve is reduced, and the rotating speed of the vortex centrifugal fan blade is reduced, so that the actual temperature is balanced on the set temperature, and the working requirement is met.
Compared with the prior art, the invention has the beneficial effects that: the vortex centrifugal fan blade has novel structural design, realizes that liquid nitrogen is directly sprayed on the vortex centrifugal fan blade and then enters the air injection air box through the air guide pipe, and exchanges heat with a frozen product through the air injection plate, so that each drop of liquid nitrogen can be sucked away by the exhaust fan after being exchanged with the frozen product, energy is saved, the liquid nitrogen drops are fully vaporized into low-temperature gas in the air guide pipe and the air injection box, the liquid nitrogen drops can not be in direct contact with the frozen product, the production process requirements of medicines are met, and the vortex centrifugal fan blade is more scientific and practical.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a side view of the present invention;
FIG. 3 is a top view of the present invention;
in the figure: the device comprises a heat preservation box body 1, an electric control box component 2, an electric control system 3, an exhaust system 4, an air injection system 5, a liquid nitrogen spraying system 6, a low-temperature manual stop valve 7, a low-temperature liquid nitrogen electromagnetic valve 8, a pneumatic flow regulating valve 9, a safety valve 10, a Y-shaped filter 11, a liquid nitrogen conveying pipeline 12, a liquid nitrogen spraying pipe 13, a liquid nitrogen atomizing nozzle 14, a long-axis motor 15, a vortex centrifugal fan blade 16, an air injection wind cylinder 17, an air guide pipe 18, an air injection box 19 and a heat preservation door 20.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-3, the present invention provides a technical solution: a jet type liquid nitrogen deep-cooling instant freezer is composed of a heat preservation box body 1, an electric control box component 2, an electric control system 3, an exhaust system 4, a jet system 5 and a liquid nitrogen spraying system 6; the nozzle part of the liquid nitrogen spraying system 6 is arranged in the gas injection system 5, the heat preservation box body 1 is arranged in the electric control box part 2, the electric control system 3 is arranged in the electric control box part 2, and the exhaust system 4 is arranged at the upper right end of the electric control box part 2; the electric control system 3 is composed of a temperature controller, two frequency converters and a plurality of relay contactors; the exhaust system 5 is composed of an exhaust pipe and an exhaust fan, and the exhaust fan is connected with the exhaust pipe through a flange.
In the invention, a liquid nitrogen spraying system 6 consists of a low-temperature manual stop valve 7, a low-temperature liquid nitrogen electromagnetic valve 8, a pneumatic flow regulating valve 9, a safety valve 10, a Y-shaped filter 11, a liquid nitrogen conveying pipeline 12, a liquid nitrogen spraying pipe 13 and a liquid nitrogen atomizing nozzle 14; the low-temperature manual stop valve 7, the low-temperature liquid nitrogen electromagnetic valve 8, the pneumatic flow regulating valve 9, the Y-shaped filter 11, the liquid nitrogen conveying pipeline 12, the liquid nitrogen spray pipe 13 and the liquid nitrogen atomizing nozzle 14 are sequentially connected into a whole by SUS304 stainless steel pipes in series, and the safety valve 10 is connected in parallel on a pipeline between the low-temperature manual stop valve 7 and the low-temperature liquid nitrogen electromagnetic valve 8.
In the invention, the air injection system 5 consists of a long shaft motor 15, an eddy centrifugal fan blade 16, an air injection wind cylinder 17, an air guide pipe 18 and an air injection box 19; the air injection air duct is fixed on an inner top plate of the air injection box by screws, the long shaft motor is fixed on an outer top plate of the air injection box, and a long shaft of the long shaft motor penetrates into the air injection box through a through hole reserved on the air injection box; the vortex centrifugal fan blade is fixed on a shaft head of the long shaft motor; the air injection air cylinder covers the outer surface of the vortex centrifugal fan blade; the air injection wind barrel, the air guide pipe and the air injection box are welded together.
In the invention, the heat preservation box body 1 and the heat preservation door 20 form a container for keeping a low-temperature environment; the heat preservation door 20 is connected with the heat preservation box body 1 through a hinge; a low-temperature resistant sealing strip is inlaid on the heat preservation door 20; the heat preservation door 20 is supported by two gas springs, and the lower part of the heat preservation door is locked with the heat preservation box body 1 by a locking nut.
The working principle is as follows: the principle that the frozen product is quickly frozen in a very short time by using the ultra-low temperature cold energy released during the vaporization of the liquid nitrogen. Firstly, a power supply is switched on, each part is electrified for self-checking, a liquid supply electromagnetic valve is electrified in a delayed mode through a relay, a long shaft motor of an air injection system is opened, a temperature controller detects the current actual temperature in a heat preservation box body through a temperature sensor of PT100, the difference between the current actual temperature and the set temperature required by work is calculated through a CPU in the temperature controller, proportional operation is carried out, a control signal of 4-20 ma is output to a pneumatic flow regulating valve and a control frequency converter to regulate the opening degree of the flow and the rotating speed of the long shaft motor, when the difference between a process temperature (namely the actual temperature) PV value and the set temperature SV value is large, the control current output by a temperature controller is large, so that the opening degree of the pneumatic flow control valve is increased, more liquid nitrogen is supplied, the temperature is reduced, the rotating speed of a vortex centrifugal fan blade is increased, a large amount of vaporized gas is discharged, and the actual temperature is enabled to be close to the set temperature rapidly, when the actual temperature is close to the set temperature, the temperature control CPU gives a corresponding signal, the opening degree of the pneumatic flow regulating valve is reduced, and the rotating speed of the vortex centrifugal fan blade is reduced, so that the actual temperature is balanced on the set temperature, and the working requirement is met.
The long shaft motor rotates to drive the centrifugal fan blades of the turbine to rotate at a high speed, the liquid nitrogen spraying system sprays atomized liquid nitrogen particle liquid beads onto the centrifugal fan blades of the turbine through the nozzles, low-temperature high-pressure gas is generated in the air spraying air duct and reaches the air spraying box through the air guide tube, continuous high-speed air spraying flow is formed on the air spraying plate of the air spraying box, and the frozen product is uniformly sprayed to achieve the freezing effect.
In conclusion, the vortex centrifugal fan blade has novel structural design, liquid nitrogen is directly sprayed on the vortex centrifugal fan blade and then enters the air injection air box through the air guide pipe, and heat exchange is carried out between the liquid nitrogen and frozen products through the air injection plate, so that each drop of liquid nitrogen can be sucked away by the exhaust fan after being exchanged between the liquid nitrogen and the frozen products, energy is saved, the liquid nitrogen drops are fully vaporized into low-temperature gas in the air guide pipe and the air injection box, the liquid nitrogen drops can not be in direct contact with the frozen products, the production process requirements of medicines are met, and the vortex centrifugal fan blade is more scientific and practical.
It should be noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. The utility model provides a jet-propelled liquid nitrogen cryrogenic frozen machine which characterized in that: the instant freezer consists of a heat preservation box body (1), an electric cabinet component (2), an electric control system (3), an exhaust system (4), an air injection system (5) and a liquid nitrogen spraying system (6); a nozzle component of the liquid nitrogen spraying system (6) is arranged in the air injection system (5), the heat preservation box body (1) is arranged in the electric control box component (2), the electric control system (3) is arranged in the electric control box component (2), and the exhaust system (4) is arranged at the upper right end of the electric control box component (2); the electric control system (3) is composed of a temperature controller, two frequency converters and a plurality of relay contactors; the exhaust system (5) is composed of an exhaust pipe and an exhaust fan, and the exhaust fan is connected with the exhaust pipe through a flange.
2. The jet liquid nitrogen cryogenic instant freezer according to claim 1, characterized in that: the liquid nitrogen spraying system (6) consists of a low-temperature manual stop valve (7), a low-temperature liquid nitrogen electromagnetic valve (8), a pneumatic flow regulating valve (9), a safety valve (10), a Y-shaped filter (11), a liquid nitrogen conveying pipeline (12), a liquid nitrogen spraying pipe (13) and a liquid nitrogen atomizing nozzle (14); the low-temperature manual stop valve (7), the low-temperature liquid nitrogen electromagnetic valve (8), the pneumatic flow regulating valve (9), the Y-shaped filter (11), the liquid nitrogen conveying pipeline (12), the liquid nitrogen spray pipe (13) and the liquid nitrogen atomizing nozzle (14) are sequentially connected into a whole by SUS304 stainless steel pipes in series, and the safety valve (10) is connected in parallel on a pipeline between the low-temperature manual stop valve (7) and the low-temperature liquid nitrogen electromagnetic valve (8).
3. The jet liquid nitrogen cryogenic instant freezer according to claim 1, characterized in that: the air injection system (5) consists of a long shaft motor (15), an eddy centrifugal fan blade (16), an air injection wind barrel (17), an air guide pipe (18) and an air injection box (19); the air injection air duct is fixed on an inner top plate of the air injection box by screws, the long shaft motor is fixed on an outer top plate of the air injection box, and a long shaft of the long shaft motor penetrates into the air injection box through a through hole reserved on the air injection box; the vortex centrifugal fan blade is fixed on a shaft head of the long shaft motor; the air injection air cylinder covers the outer surface of the vortex centrifugal fan blade; the air injection wind barrel, the air guide pipe and the air injection box are welded together.
4. The jet liquid nitrogen cryogenic instant freezer according to claim 1, characterized in that: the heat preservation box body (1) and the heat preservation door (20) form a container for keeping a low-temperature environment; the heat preservation door (20) is connected with the heat preservation box body (1) through a hinge; a low-temperature resistant sealing strip is inlaid on the heat preservation door (20); the heat preservation door (20) is supported by two gas springs, and the lower part of the heat preservation door is locked with the heat preservation box body (1) by a locking nut.
5. The use method of the jet liquid nitrogen deep-cooling instant freezer is characterized by comprising the following steps: the using method comprises the following steps:
A. firstly, a power supply is switched on, each part is electrified for self-checking, a liquid supply electromagnetic valve is electrified in a delayed mode through time relay, a long shaft motor of an air injection system is started, and a temperature controller is bolted to the current actual temperature in a heat preservation box through a temperature sensor PT 100;
B. calculating the difference between the set temperature and the set temperature required by the work through a CPU in the air conditioner, performing proportional calculation, and outputting a control signal of 4-20 ma to a pneumatic flow regulating valve and a control frequency converter to regulate the opening degree of the flow and the rotating speed of a long shaft motor;
C. when the difference between the PV value of the process temperature (namely the actual temperature) and the SV value of the set temperature is large, the control current output by the temperature controller is large, so that the opening degree of the pneumatic flow control valve is increased, more liquid nitrogen is supplied, the temperature reduction is accelerated, the rotating speed of the vortex centrifugal fan blade is increased, a large amount of vaporized gas is discharged, and the actual temperature is quickly close to the set temperature;
D. when the actual temperature is close to the set temperature, the temperature control CPU gives a corresponding signal, the opening degree of the pneumatic flow regulating valve is reduced, and the rotating speed of the vortex centrifugal fan blade is reduced, so that the actual temperature is balanced on the set temperature, and the working requirement is met.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419029.XA CN114198958A (en) | 2021-11-26 | 2021-11-26 | Jet type liquid nitrogen deep-cooling instant freezer and use method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419029.XA CN114198958A (en) | 2021-11-26 | 2021-11-26 | Jet type liquid nitrogen deep-cooling instant freezer and use method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114198958A true CN114198958A (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111419029.XA Pending CN114198958A (en) | 2021-11-26 | 2021-11-26 | Jet type liquid nitrogen deep-cooling instant freezer and use method thereof |
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| Country | Link |
|---|---|
| CN (1) | CN114198958A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204268776U (en) * | 2014-11-20 | 2015-04-15 | 南通恒信达冷冻设备有限公司 | A kind of jet-propelled liquid nitrogen deep instant freezer |
| CN106196878A (en) * | 2016-08-04 | 2016-12-07 | 航天新长征电动汽车技术有限公司 | A kind of refrigerating device and liquid nitrogen refrigerating method thereof |
| CN210035984U (en) * | 2019-03-27 | 2020-02-07 | 南通恒信达冷冻设备有限公司 | Energy-saving jet type liquid nitrogen instant freezer |
| CN111750589A (en) * | 2019-03-27 | 2020-10-09 | 南通恒信达冷冻设备有限公司 | Energy-saving jet type liquid nitrogen instant freezer |
-
2021
- 2021-11-26 CN CN202111419029.XA patent/CN114198958A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204268776U (en) * | 2014-11-20 | 2015-04-15 | 南通恒信达冷冻设备有限公司 | A kind of jet-propelled liquid nitrogen deep instant freezer |
| CN106196878A (en) * | 2016-08-04 | 2016-12-07 | 航天新长征电动汽车技术有限公司 | A kind of refrigerating device and liquid nitrogen refrigerating method thereof |
| CN210035984U (en) * | 2019-03-27 | 2020-02-07 | 南通恒信达冷冻设备有限公司 | Energy-saving jet type liquid nitrogen instant freezer |
| CN111750589A (en) * | 2019-03-27 | 2020-10-09 | 南通恒信达冷冻设备有限公司 | Energy-saving jet type liquid nitrogen instant freezer |
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Application publication date: 20220318 |