CN217715559U - Quick-freezing system capable of utilizing liquid nitrogen cold energy step by step - Google Patents
Quick-freezing system capable of utilizing liquid nitrogen cold energy step by step Download PDFInfo
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- CN217715559U CN217715559U CN202221946440.2U CN202221946440U CN217715559U CN 217715559 U CN217715559 U CN 217715559U CN 202221946440 U CN202221946440 U CN 202221946440U CN 217715559 U CN217715559 U CN 217715559U
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Abstract
The utility model belongs to the field of cold chain equipment, and discloses a quick-freezing system for utilizing liquid nitrogen cold energy step by step, which comprises at least three quick-freezing cavities, wherein each quick-freezing cavity is provided with a liquid nitrogen spraying module, a heat exchange module, a gas supply pipeline and an exhaust pipeline; the heat exchange module comprises a heat exchanger, a coolant storage module, a circulating pump and a coolant refrigeration module; the heat exchanger is used for realizing heat exchange between gas in the quick-freezing cavity and the coolant; the cold storage agent refrigerating module is used for carrying out heat exchange on the cold storage agent in the cold storage agent storage module and nitrogen discharged by the exhaust pipeline; the heat exchanger, the cold storage agent storage module and the circulating pump form a circulating loop. The system can fully utilize the cold energy of the liquid nitrogen, and realize quick and energy-saving quick freezing of objects difficult to quick freeze.
Description
Technical Field
The utility model relates to a cold chain equipment field specifically is a quick-freeze system that liquid nitrogen cold volume utilized step by step.
Background
Comparative document 1 (D1): ZL202010508933.7 discloses a cold chain logistics container vehicle with combined refrigeration of LNG, liquid nitrogen and a coolant, which comprises a vehicle head, a trailer connected with the vehicle head, a container fixed on the trailer and having a cold insulation function, an LNG storage tank used for supplying fuel to an engine, a liquid nitrogen storage tank used for supplying cold to the container, and a coolant storage tank, wherein a liquid nitrogen refrigeration pipe capable of outputting atomized liquid nitrogen or nitrogen is arranged at the top of the inner wall of the container, and a coolant refrigeration layer is laid at the bottom of the inner wall of the container; the cold storage agent refrigerating layer is communicated with the cold storage agent storage tank; an evaporation coil is arranged between an outlet of the LNG storage tank and the engine, the evaporation coil is positioned in the coolant storage tank, and an exhaust port communicated with the atmosphere is arranged on the container. The container vehicle has more accurate temperature control and more uniform refrigeration.
Comparative document 2 (D2): ZL201822178658.8 discloses a four-door self-precooling liquid nitrogen cabinet, which comprises a shell, wherein a first freezing cavity, a second freezing cavity, a third freezing cavity, a fourth freezing cavity, a first freezing door, a second freezing door, a third freezing door, a fourth freezing door, a first exhaust pipe, a first precooling pipe, a second exhaust pipe, a second precooling pipe, a third exhaust pipe, a third precooling pipe, a fourth exhaust pipe, a fourth precooling pipe, a first exhaust valve, a second exhaust valve, a third exhaust valve, a fourth exhaust valve, a first precooling valve, a second precooling valve, a third precooling valve, a fourth precooling valve and a connecting pipe are arranged on the shell. Through setting up four independent freezing chambeies, can independently freeze, prevent to get rid of the flavor, can save the electric energy when freezing article few, can meet cold the freezing chamber on next door to the lower nitrogen gas of temperature through four precooling pipes, reduce extravagantly to improve the performance of liquid nitrogen quick-freeze cabinet.
The above patents are all prior applications of the present applicant; d1, absorbing the cold energy of the LNG through a cold storage agent storage tank and refrigerating the container through the cold storage agent; d2 discloses a pre-cooling operation of cryogenic nitrogen gas gasified with liquid nitrogen.
D2 has a problem in that the cold capacity utilization rate is still insufficient.
In the durian quick-freezing process, the durian is very troublesome in the aspect that the skin of the durian is thick, liquid nitrogen spraying amount must be increased to a quick-freezing machine to achieve quick freezing, but heat exchange of the durian is limited, which means that a large amount of low-temperature nitrogen is wasted, even if a D2 scheme is adopted, the cold energy cannot be fully absorbed, and because the liquid nitrogen amount during quick freezing is too large, the waste nitrogen is discharged to the atmosphere without complete heat exchange when precooling the durian.
The performance feedback requirements of overseas users on our equipment are: the amount of liquid nitrogen used cannot be further reduced.
Therefore, the utility model discloses the problem that will solve lies in: how to realize the full utilization of the energy of the liquid nitrogen.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a quick-freeze system that liquid nitrogen cold volume utilized step by step, this system can make full use of the cold volume of liquid nitrogen, realizes quick, energy-conserving quick-freeze to the object of difficult quick-freeze.
In order to achieve the above object, the utility model provides a following technical scheme: a quick-freezing system for gradually utilizing liquid nitrogen cold energy comprises at least three quick-freezing cavities, wherein each quick-freezing cavity is provided with a liquid nitrogen spraying module, a heat exchange module, an air supply pipeline and an exhaust pipeline; the heat exchange module comprises a heat exchanger, a coolant storage module, a circulating pump and a coolant refrigeration module; the heat exchanger is used for realizing heat exchange between gas in the quick-freezing cavity and the coolant; the cold storage agent refrigerating module is used for carrying out heat exchange on the cold storage agent in the cold storage agent storage module and nitrogen discharged by the exhaust pipeline; the heat exchanger, the cold storage agent storage module and the circulating pump form a circulating loop;
the exhaust pipeline is provided with two exhaust paths, wherein one exhaust path is connected to a gas inlet of the coolant refrigeration module, and the other exhaust path is the atmosphere; a first valve and a second valve are arranged on the two discharge paths; the gas supply pipeline is communicated with a gas outlet of the coolant refrigerating module.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model adopts at least three quick-freezing cavities (if the three quick-freezing cavities are to be simplified, the three quick-freezing cavities can be regarded as 3 independent quick freezers), and the cold energy of the liquid nitrogen is fully utilized through the circulation of the three quick-freezing cavities;
particularly, if the three quick-freezing cavities are quick-freezing cavities A-C respectively;
the working process is as follows: liquid nitrogen is sprayed into the quick-freezing cavity A for quick freezing, the generated waste nitrogen (which can be mixed with a small amount of liquid nitrogen particles) is guided into the cold storage agent refrigeration module to cool the cold storage agent, and the nitrogen subjected to heat exchange is conveyed to the quick-freezing cavity C; meanwhile, the quick-freezing cavity B adopts a heat exchanger for heat exchange operation, so that refrigeration in the quick-freezing cavity is realized;
an article is subjected to quick freezing, and the process required to be carried out is as follows: precooling waste nitrogen → quickly freezing in a heat exchanger → quickly freezing in liquid nitrogen.
By the method, energy-saving and quick-freezing of the articles can be realized.
Drawings
FIG. 1 is a schematic structural view of example 1;
FIG. 2 is a flow chart of the pipeline of example 1.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1 and 2, the quick-freezing system for gradually utilizing the cold energy of liquid nitrogen comprises at least three quick-freezing cavities 1, wherein each quick-freezing cavity 1 is provided with a liquid nitrogen spraying module 2, a heat exchange module, an air supply pipeline 4 and an exhaust pipeline 5; the liquid nitrogen spraying module 2 is provided with a plurality of atomizing heads facing the quick-freezing cavity, the atomizing heads are connected with an external liquid nitrogen supply pipeline, and the heat exchange module comprises a heat exchanger 6, a coolant storage module 3, a circulating pump 7 and a coolant refrigerating module 8; the cold storage agent storage module is a storage tank, and the heat exchanger 6 is used for realizing heat exchange between gas in the quick-freezing chamber 1 and the cold storage agent; the cold storage agent refrigerating module is used for carrying out heat exchange on the cold storage agent in the cold storage agent storage module 3 and nitrogen discharged by the exhaust pipeline 5; the heat exchanger 6, the cold storage agent storage module 3 and the circulating pump 7 form a circulating loop;
the exhaust pipeline 5 is provided with two exhaust paths, wherein one exhaust path is connected to a gas inlet of the coolant refrigerating module, and the other exhaust path is the atmosphere; a first valve 9 and a second valve 10 are arranged on the two discharge paths; the gas supply pipeline 4 is communicated with a gas outlet of the coolant refrigerating module.
In the embodiment, at least three quick-freezing cavities 1 are adopted, and the cold energy of the liquid nitrogen is fully utilized through the circulation of the three quick-freezing cavities 1;
specifically, if the three quick-freezing cavities 1 are quick-freezing cavities A-C respectively;
the working process is as follows: liquid nitrogen is sprayed into the quick-freezing cavity A for quick freezing, the generated waste nitrogen (which can be mixed with a small amount of liquid nitrogen particles) is guided into the cold storage agent refrigeration module to cool the cold storage agent, and the nitrogen subjected to heat exchange is conveyed to the quick-freezing cavity C; meanwhile, the quick-freezing cavity B adopts the heat exchanger 6 for heat exchange operation, so that refrigeration in the quick-freezing cavity 1 is realized;
an article is subjected to quick freezing, and the process required to be carried out is as follows: precooling waste nitrogen → quickly freezing in a heat exchanger 6 → quickly freezing in liquid nitrogen.
By the method, energy-saving and quick-freezing of the articles can be realized.
In the present embodiment, the two discharge paths of the exhaust pipe 5 may be implemented in two ways, one way is to set the exhaust pipe 5 as a tee pipe, and the other way is to set the two exhaust pipes 5.
The instant freezer in this embodiment covers all types of liquid nitrogen instant freezers, including but not limited to box type, tunnel type, etc.
Preferably, a forced convection device 11 is arranged in the quick-freezing chamber 1. The forced convection device 11 is a fan which can play a role in any one of three processes of waste nitrogen precooling, heat exchanger quick freezing and liquid nitrogen quick freezing; in the pre-cooling stage, a fan can be used for carrying out rapid contact heat exchange on the nitrogen and the articles; in the quick-freezing stage of the heat exchanger 6, the quick-freezing cavity 1 is in a closed state, nitrogen is not supplemented inwards or exhausted outwards, the fan is used for promoting the gas in the quick-freezing cavity 1 to perform quick heat exchange with the heat exchanger 6, and the gas in the quick-freezing cavity 1 performs contact heat exchange on articles; in the liquid nitrogen quick-freezing stage, the fan is used for promoting the diffusion of liquid nitrogen particles, so that the liquid nitrogen particles are in more thorough contact with objects, and the gasification of the liquid nitrogen is promoted.
As the optimization of this embodiment, the forced convection device 11 may be disposed at both the liquid nitrogen spraying module 2 and the heat exchange module.
In this embodiment, the heat exchanger 6 and the coolant refrigeration module are both heat exchangers 6 that use heat pipes to perform heat exchange, and the heat pipe heat exchanger 6 is generally composed of the following components: one end of the heat pipe is contacted with the coolant, and the other end of the heat pipe is contacted with the nitrogen, so that rapid heat exchange is realized; but the present embodiment does not exclude other conventional types of heat exchangers 6 such as tube and strip heat exchangers and the like.
As a further refinement of the present embodiment, the liquid inlet of the heat exchanger 6 is provided with a third valve 12; and a fourth valve 13 is arranged on the gas supply pipeline 4.
In the working process, taking three quick-freezing cavities 1 as quick-freezing cavities A-C respectively as an example:
the quick-freezing chamber A is in a liquid nitrogen quick-freezing stage, and at the moment, the first valve 9 is opened, and the second valve 10, the third valve 12 and the fourth valve 13 are closed;
the quick-freezing chamber B is in a cold storage agent quick-freezing stage, the first valve 9, the second valve 10 and the fourth valve 13 are closed at the moment, and the third valve 12 is opened;
the quick-freezing chamber C is in a precooling stage, the second valve 10 and the fourth valve 13 are opened at the moment, and the first valve 9 and the third valve 12 are closed.
Preferably, a plurality of accommodating layers are arranged in the quick-freezing cavity 1, and the accommodating layers are provided with heat conducting plates with heat pipe structures. In practical application, however, the quick-freezing chamber 1 does not need to be provided with a layer of the storage material; for example, when large-volume objects such as durian are quickly frozen, a shelf filled with durian is pushed into the quick-freezing chamber 1.
The temperature guide plate of the embodiment is a sample provided by Foshan Feizhii Metal products Co.
Preferably, fans 14 are arranged in the air supply pipeline 4 and the air exhaust pipeline 5, and a sealing door 15 is arranged in the quick-freezing cavity 1 in a matched manner; the quick-freezing chamber 1 is a quick-freezing chamber 1 with a heat preservation structure.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention.
Claims (7)
1. A quick-freezing system for gradually utilizing liquid nitrogen cold energy comprises at least three quick-freezing cavities, and is characterized in that each quick-freezing cavity is provided with a liquid nitrogen spraying module, a heat exchange module, an air supply pipeline and an exhaust pipeline; the heat exchange module comprises a heat exchanger, a coolant storage module, a circulating pump and a coolant refrigeration module; the heat exchanger is used for realizing heat exchange between gas in the quick-freezing cavity and the coolant; the cold storage agent refrigerating module is used for carrying out heat exchange on the cold storage agent in the cold storage agent storage module and nitrogen discharged by the exhaust pipeline; the heat exchanger, the cold storage agent storage module and the circulating pump form a circulating loop;
the exhaust pipeline is provided with two exhaust paths, wherein one exhaust path is connected to a gas inlet of the coolant refrigeration module, and the other exhaust path is the atmosphere; a first valve and a second valve are arranged on the two discharge paths; the gas supply pipeline is communicated with a gas outlet of the coolant refrigerating module.
2. The quick-freezing system for progressive utilization of liquid nitrogen cold energy as claimed in claim 1, wherein a forced convection device is arranged in the quick-freezing chamber.
3. The quick-freezing system for gradually utilizing the cold energy of the liquid nitrogen as claimed in claim 1, wherein the heat exchanger and the coolant refrigerating module are heat exchangers which adopt heat pipes for heat exchange.
4. The quick-freezing system for gradually utilizing cold energy of liquid nitrogen as claimed in any one of claims 1 to 3, wherein a liquid inlet of the heat exchanger is provided with a third valve; and a fourth valve is arranged on the gas supply pipeline.
5. The quick-freezing system for gradually utilizing the cold energy of the liquid nitrogen as claimed in any one of claims 1 to 3, wherein a plurality of accommodating layers are arranged in the quick-freezing cavities, and the accommodating layers are provided with heat conducting plates with heat pipe structures.
6. The quick-freezing system for gradually utilizing cold energy of liquid nitrogen according to any one of claims 1 to 3, wherein fans are arranged in the air supply pipeline and the air exhaust pipeline.
7. The quick-freezing system for gradually utilizing the cold energy of the liquid nitrogen as claimed in any one of claims 1 to 3, wherein a sealing door is matched with the quick-freezing chamber; the quick-freezing chamber is a quick-freezing chamber with a heat preservation structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221946440.2U CN217715559U (en) | 2022-07-26 | 2022-07-26 | Quick-freezing system capable of utilizing liquid nitrogen cold energy step by step |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221946440.2U CN217715559U (en) | 2022-07-26 | 2022-07-26 | Quick-freezing system capable of utilizing liquid nitrogen cold energy step by step |
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| CN217715559U true CN217715559U (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202221946440.2U Active CN217715559U (en) | 2022-07-26 | 2022-07-26 | Quick-freezing system capable of utilizing liquid nitrogen cold energy step by step |
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| CN (1) | CN217715559U (en) |
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2022
- 2022-07-26 CN CN202221946440.2U patent/CN217715559U/en active Active
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