CN112856891A - Vertical ultra-low temperature freezer - Google Patents
Vertical ultra-low temperature freezer Download PDFInfo
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- CN112856891A CN112856891A CN202110221579.4A CN202110221579A CN112856891A CN 112856891 A CN112856891 A CN 112856891A CN 202110221579 A CN202110221579 A CN 202110221579A CN 112856891 A CN112856891 A CN 112856891A
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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
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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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
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
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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
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/005—Mounting of control devices
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Abstract
The invention discloses a vertical ultralow temperature freezing box which comprises a vertical box body, wherein a cooler is arranged in the vertical box body, and a nitrogen refrigerating mechanism is arranged at the vertical box body; the nitrogen refrigeration mechanism comprises a high-speed motor, a turbine compressor, an after-cooler, a first regenerator, a second regenerator and an expander; the first heat regenerator and the second heat regenerator are connected in series; the high-speed motor drives the turbine compressor, the other end of the power shaft extends into the expander and is connected with the impeller, and the air outlet of the turbine compressor is connected with the inlet of the aftercooler; the outlet of the aftercooler is connected with the first regenerator, the high-temperature outlet of the second regenerator is connected with the inlet of the expander, the outlet of the expander is connected with the inlet of the cold-using cooler, the outlet of the cold-using cooler is connected with the low-temperature inlet of the second regenerator, and the low-temperature outlet of the second regenerator is connected with the air inlet of the turbine compressor; the aluminum calandria, the fins, the heat exchange tooth edges and the specific arrangement of the cooler can rapidly and uniformly reduce the temperature in the vertical box body, defrosting is not needed for a long time, and nitrogen can be supplemented in time.
Description
Technical Field
The invention relates to the technical field of refrigeration, in particular to an ultralow-temperature vertical refrigerator, which is invented by Henan Xinfei refrigeration appliance Limited company for solving the problems of complex structure, large vibration, poor reliability, low operation efficiency and low stability control precision of the conventional low-temperature refrigerator.
Background
At present, a low-temperature box below 86 ℃ usually adopts two-stage or three-stage simple cascade refrigeration or mixed working medium natural cascade refrigeration, the simple cascade refrigeration needs more than two sets of refrigeration cycles to work jointly, the structure is complex, the reliability is poor, and the maintenance is difficult.
The natural cascade refrigeration system adopts mixed working media, the control system is relatively complex, and once the mixed working media leak, the components of the refrigerant are changed, so that the influence on the refrigeration effect is large, the refrigerant cannot be supplemented, the refrigerant needs to be completely discharged and added again, and the horizontal type refrigerator has the defect of inconvenience in storing articles.
Disclosure of Invention
The invention aims to provide a vertical ultralow temperature freezer which adopts nitrogen as a refrigerant, has no pollution to the environment, has high refrigeration efficiency and can quickly reduce the temperature.
In order to solve the technical problem, the invention provides a vertical ultralow temperature freezing box which comprises a vertical box body, wherein a cold using device for releasing cold energy into the vertical box body is arranged in the vertical box body, and a nitrogen refrigerating mechanism is arranged at the vertical box body; the nitrogen refrigeration mechanism comprises a high-speed motor, a turbine compressor, an after-cooler, a first regenerator, a second regenerator and an expander;
the first heat regenerator is provided with a first high-temperature inlet, a first high-temperature outlet, a second low-temperature inlet and a second low-temperature outlet; the first high-temperature inlet is connected with the first high-temperature outlet through an internal high-temperature pipeline of the first heat regenerator, and the second low-temperature inlet is connected with the second low-temperature outlet through an internal low-temperature pipeline of the first heat regenerator;
the second regenerator is provided with a second high-temperature inlet, a second high-temperature outlet, a first low-temperature inlet and a first low-temperature outlet; the second high-temperature inlet is connected with the second high-temperature outlet through an internal high-temperature pipeline of the second heat regenerator, and the first low-temperature inlet is connected with the first low-temperature outlet through an internal low-temperature pipeline of the second heat regenerator;
a power shaft of the high-speed motor is connected with a shaft of the turbine compressor and drives the turbine compressor; the other end of the power shaft of the high-speed motor extends into the expander and is connected with the impeller, the inlet of the expander faces the impeller, and nitrogen passes through the inlet of the expander through a third high-temperature pipeline and then impacts the impeller to assist in driving the power shaft of the high-speed motor to rotate;
the turbine compressor is used for compressing low-temperature low-pressure nitrogen into high-temperature high-pressure nitrogen, a gas outlet of the turbine compressor is connected with a first high-temperature pipeline, the first high-temperature pipeline is connected with an inlet of the aftercooler, and a heat dissipation fan used for blowing ambient air to the aftercooler is arranged adjacent to the aftercooler; the outlet of the aftercooler is connected with the first high-temperature inlet of the first heat regenerator through a second high-temperature pipeline, and the first high-temperature outlet is connected with the second high-temperature inlet of the second heat regenerator through a high-temperature connecting pipe; the second high-temperature outlet is connected with the inlet of the expander through a third high-temperature pipeline, the outlet of the expander is connected with a first low-temperature pipeline, the first low-temperature pipeline is connected with the inlet of the cold using device, the outlet of the cold using device is connected with the first low-temperature inlet of the second heat regenerator through a second low-temperature pipeline, and the first low-temperature outlet is connected with the second low-temperature inlet of the first heat regenerator through a low-temperature connecting pipe;
a second low-temperature outlet of the second heat regenerator is connected with an air inlet of the turbine compressor through a third low-temperature pipeline; the cold-using devices are aluminum tubes with fins and are distributed on the circumferential side wall and the bottom wall of the vertical box body.
The third low-temperature pipeline is connected with a gas supplementing pipe, a gas supplementing electromagnetic valve is arranged on the gas supplementing pipe, and the tail end of the gas supplementing pipe is connected with a gas supplementing tank for storing nitrogen; the air supply electromagnetic valve is connected with an electric control device which is connected with a high-speed motor.
The third low-temperature pipeline is connected in series with a low-pressure filter, and the third high-temperature pipeline is connected in series with a high-pressure filter.
And a plurality of heat exchange tooth edges are arranged on the inner wall of the aluminum calandria tube along the circumferential direction.
A high-pressure sensor is arranged on the first high-temperature pipeline, and a low-pressure sensor is arranged on the third low-temperature pipeline; the high-voltage sensor and the low-voltage sensor are both connected with an electric control device.
The invention has the following advantages:
in the invention, nitrogen gas passes through the inlet of the expander and then impacts the impeller to drive the power shaft of the high-speed motor to rotate, so that the power of the high-speed motor can be reduced, the nitrogen gas is favorable for expanding and cooling, and the energy-saving effect is also generated. Up to one hundred thousand revolutions can rapidly reduce the temperature.
The cold machines are distributed on the circumferential side wall and the bottom wall of the vertical box body (when the vertical box body is in a cubic shape, the circumferential side wall has 4 faces, and 5 faces are provided with the cold machines), so that the temperature in the vertical box body can be rapidly and uniformly reduced, the refrigeration effect is good, defrosting is not needed for a long time, and the stable operation of the system is ensured.
Two regenerators are adopted, the volume of a single regenerator is reduced, the arrangement can be more flexibly carried out, and the influence of overlarge size of the single regenerator on the assembly size of the whole machine is avoided.
The first heat regenerator and the second heat regenerator enable high-temperature nitrogen and low-temperature nitrogen to exchange heat more fully, and are beneficial to obtaining lower temperature in the expansion process after the high-temperature nitrogen is cooled, so that the refrigerating capacity is increased, and the energy consumption of the turbine compressor is reduced.
When the high-temperature nitrogen passes through the aftercooler, the heat is radiated to the environment under the air supply effect of the cooling fan, the precooling effect is achieved, and the nitrogen expansion cooling is facilitated to obtain lower temperature.
The invention has simple structure, when the ultra-low temperature freezer needs refrigeration, the turbine compressor is started, the circulating fan is preferably arranged in the vertical box body of the ultra-low temperature freezer, and the circulating fan is started at the moment. The circulating fan forces the gas in the storage space of the vertical box body to circulate and be cooled by the cooler, so that the temperature in the vertical box body is reduced.
The invention uses nitrogen as refrigerating working medium, which does not cause any pollution to the atmosphere, and because the turbine compressor adopts the pneumatic bearing suspension technology, no friction exists at all, thus the efficiency is higher than that of an oil lubrication compressor. The rotating speed of the turbine compressor can be adjusted according to the refrigeration requirement, so that the whole system is stable and reliable, the requirement of the temperature in a wider box can be met, and the requirement of various refrigeration temperatures can be met by one box.
In the invention, the rotating speed of the turbine compressor can be as high as 100000rpm and can be adjusted at will, so that the temperature in the box can be quickly reduced through high rotating speed, and the temperature fluctuation in the vertical box can be avoided as much as possible through adjusting the rotating speed.
After the electric control device acquires the system low pressure monitored by the low-pressure sensor and the current magnitude of the high-speed motor, the low-pressure sensor can timely find and protect the low pressure when the nitrogen is insufficient, the air supplementing electromagnetic valve is opened to supplement the nitrogen into the system, the gas bearing of the high-speed motor is prevented from being worn due to lack of a refrigerant (nitrogen), and the nitrogen refrigerating mechanism is ensured to provide sufficient cold.
After the electric control device acquires the system high voltage monitored by the high-voltage sensor and the current of the high-speed motor, the rotating speed of the high-speed motor can be correspondingly controlled, and the phenomena of overhigh high voltage and overlarge current are avoided.
The low pressure filter can prevent foreign matters from entering the turbine compressor so as to avoid damage of the compressor, and the high pressure filter can prevent foreign matters from entering the expander so as to protect the impeller, so that the invention can work normally for a long time.
The heat exchange efficiency of low-temperature nitrogen gas which is emitted outwards through the aluminum calandria is improved by the heat exchange tooth edges.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic structural view of an aluminum gauntlet;
fig. 3 is a schematic cross-sectional view of an aluminum gauntlet.
Detailed Description
As shown in fig. 1 to 3, a vertical ultra-low temperature refrigerator according to the present invention includes a vertical cabinet in which a refrigerator 1 for discharging cooling energy into the vertical cabinet is disposed, and the vertical cabinet is a low temperature storage container, which is a conventional art and is not shown.
A nitrogen refrigerating mechanism is arranged at the vertical box body; the nitrogen refrigeration mechanism comprises a high-speed motor 2, a turbine compressor 3, an after cooler 4, a first regenerator 5, a second regenerator 6 and an expander 7;
the first regenerator 5 has a first high temperature inlet 8, a first high temperature outlet 9, a second low temperature inlet 10 and a second low temperature outlet 11; the first high-temperature inlet 8 is connected with a first high-temperature outlet 9 through an internal high-temperature pipeline of the first heat regenerator 5, and the second low-temperature inlet 10 is connected with a second low-temperature outlet 11 through an internal low-temperature pipeline of the first heat regenerator 5;
the second regenerator 6 has a second high temperature inlet 12, a second high temperature outlet 13, a first low temperature inlet 14 and a first low temperature outlet 15; the second high-temperature inlet 12 is connected with a second high-temperature outlet 13 through an internal high-temperature pipeline of the second heat regenerator 6, and the first low-temperature inlet 14 is connected with a first low-temperature outlet 15 through an internal low-temperature pipeline of the second heat regenerator 6;
a power shaft 16 of the high-speed motor 2 is connected with a shaft of the turbine compressor 3 and drives the turbine compressor 3; the other end of the power shaft 16 of the high-speed motor 2 extends into the expander 7 and is connected with an impeller (the impeller is conventional technology, not shown in the figure), an inlet of the expander 7 faces the impeller, and nitrogen passes through a third high-temperature pipeline, passes through the inlet of the expander 7 and then impacts the impeller to assist in driving the power shaft 16 of the high-speed motor 2 to rotate; the aftercooler 4, the cooler 1 and the regenerator are all heat exchangers.
The turbo compressor 3 is used for compressing low-temperature low-pressure nitrogen into high-temperature high-pressure nitrogen, a gas outlet of the turbo compressor 3 is connected with a first high-temperature pipeline 17, the first high-temperature pipeline 17 is connected with an inlet of the after-cooler 4, and a heat dissipation fan 18 (preferably an axial flow fan) for blowing ambient air to the after-cooler 4 is arranged adjacent to the after-cooler 4; the outlet of the aftercooler 4 is connected with the first high-temperature inlet 8 of the first regenerator 5 through a second high-temperature pipeline 19, and the first high-temperature outlet 9 is connected with the second high-temperature inlet 12 of the second regenerator 6 through a high-temperature connecting pipe 20; the second high-temperature outlet 13 is connected with the inlet of the expander 7 through a third high-temperature pipeline 21, the outlet of the expander 7 is connected with a first low-temperature pipeline 22, the first low-temperature pipeline 22 is connected with the inlet of the cooler 1, the outlet of the cooler 1 is connected with a first low-temperature inlet 14 of the second regenerator 6 through a second low-temperature pipeline 23, and the first low-temperature outlet 15 is connected with a second low-temperature inlet 10 of the first regenerator 5 through a low-temperature connecting pipe 24;
the second low-temperature outlet 11 of the second regenerator 6 is connected to the air inlet of the turbine compressor 3 via a third low-temperature pipeline 25;
the cooler 1 is an aluminum calandria 26 with fins 27, and the cooler 1 is distributed on the circumferential side wall and the bottom wall of the vertical box body. The first regenerator 5 and the second regenerator 6 each have a foamed insulation layer 36. The width of the fins 27 is 1-5 times of the pipe diameter of the aluminum calandria 26.
In the invention, nitrogen gas passes through the inlet of the expansion machine 7 and then impacts the impeller to drive the power shaft 16 of the high-speed motor 2 to rotate, so that the power of the high-speed motor 2 can be reduced, the nitrogen gas is favorable for expansion and cooling, and the energy-saving effect is also generated.
Up to one hundred thousand revolutions can rapidly reduce the temperature. The cold devices 1 are distributed on the circumferential side wall and the bottom wall of the vertical box body (when the vertical box body is in a cubic shape, the circumferential side wall has 4 faces, and 5 faces are provided with the cold devices 1), so that the temperature in the vertical box body can be rapidly and uniformly reduced, the refrigeration effect is good, defrosting is not needed for a long time, and the stable operation of the system is ensured.
Two regenerators are adopted, the volume of a single regenerator is reduced, the arrangement can be more flexibly carried out, and the influence of overlarge size of the single regenerator on the assembly size of the whole machine is avoided.
The first heat regenerator 5 and the second heat regenerator 6 enable the high-temperature nitrogen and the low-temperature nitrogen to exchange heat more fully, so that the high-temperature nitrogen can obtain lower temperature in the expansion process after being cooled, the refrigerating capacity is increased, and the energy consumption of the turbine compressor 3 is reduced.
When the high-temperature nitrogen passes through the aftercooler 4, the heat is radiated to the environment under the air supply action of the heat radiation fan 18, so that the precooling effect is achieved, and the nitrogen expansion and cooling can be facilitated to obtain a lower temperature.
The invention has simple structure, when the ultra-low temperature freezer needs refrigeration, the turbine compressor 3 is started, and the vertical box body of the ultra-low temperature freezer is preferably internally provided with the circulating fan which is started at the moment. The circulating fan forces the gas in the storage space of the vertical box body to circulate and be cooled by the cooler 1, so that the temperature in the vertical box body is reduced.
The invention uses nitrogen as the refrigeration working medium, will not cause any pollution to the atmosphere, because the turbine compressor 3 adopts the suspension technology of the pneumatic bearing, there is no friction at all, therefore the efficiency is higher than the oil-lubricated compressor. The rotating speed of the turbine compressor 3 can be adjusted according to the refrigeration requirement, so that the whole system is stable and reliable, the requirement of the temperature in a wider box can be met, and the requirement of various refrigeration temperatures can be met by one box.
In the invention, the rotating speed of the turbine compressor 3 can be as high as 100000rpm and can be adjusted at will, so that the temperature in the box can be quickly reduced through high rotating speed, and the temperature fluctuation in the vertical box can be avoided as much as possible through adjusting the rotating speed.
The third low-temperature pipeline 25 is connected with a gas supplementing pipe 28, the gas supplementing pipe 28 is provided with a gas supplementing electromagnetic valve 29, the tail end of the gas supplementing pipe 28 is connected with a gas supplementing tank 30, and the gas supplementing tank 30 is used for storing nitrogen; the air supply electromagnetic valve 29 is connected with an electric control device which is connected with the high-speed motor 2. The electric control device is a single chip microcomputer or an integrated circuit, preferably a PLC, and is a conventional component, which is not shown in the figure.
The third low-temperature pipeline 25 is connected in series with a low-pressure filter 31, and the third high-temperature pipeline 21 is connected in series with a high-pressure filter 32. The low pressure filter 31 can prevent foreign matters from entering the turbo compressor 3 to prevent the compressor from being damaged, and the high pressure filter 32 can prevent foreign matters from entering the expander 7 to protect the impeller, thereby protecting the present invention from working normally for a long time.
And a plurality of heat exchange toothed edges 33 are arranged on the inner wall of the aluminum calandria 26 along the circumferential direction. The heat exchange toothed edge 33 improves the heat exchange efficiency of the low-temperature nitrogen which is emitted outwards through the aluminum calandria 26.
A high-pressure sensor 34 is arranged on the first high-temperature pipeline 17, and a low-pressure sensor 35 is arranged on the third low-temperature pipeline 25; the high pressure sensor 34 and the low pressure sensor 35 are connected to an electronic control unit. After the electric control device acquires the system low pressure monitored by the low pressure sensor 35 and the current magnitude of the high-speed motor 2, the low pressure protection can be timely found out when the nitrogen is insufficient, the gas supplementing electromagnetic valve 29 is opened to supplement the nitrogen into the system, the gas bearing of the high-speed motor 2 is prevented from being worn due to lack of refrigerant (nitrogen), and the nitrogen refrigerating mechanism is ensured to provide sufficient cold.
After the electric control device acquires the system high voltage monitored by the high voltage sensor 34 and the current of the high-speed motor 2, the electric control device can correspondingly control the rotating speed of the high-speed motor 2, and avoid the phenomena of overhigh high voltage and overlarge current. The heat regenerator can be connected in series in two stages or in series in multiple stages, so that the heat exchange efficiency between high-temperature nitrogen and low-temperature nitrogen is enhanced.
When the high-speed motor 2 works, the high-speed motor 2 is started at the rotating speed of 30000-40000 rpm when being started, the high-speed motor quickly passes through an unstable area, the abrasion of a motor connecting shaft is avoided, the rotating speed of the high-speed motor 23 at the initial cooling stage is not higher than 80000rpm, the compressor is prevented from surging, and the high-speed motor 2 enters the rated rotating speed for running after the cooler 1 is obviously cooled.
Preferably, the high-speed motor 2 is started at the rotating speed of 35000rpm when being started, and is operated at the rotating speed of 60000rpm for t2 seconds after being operated for t1 seconds, and then is operated at the rated rotating speed, wherein t2 is greater than t 1; the cooling fan 18 is started after t3 seconds when the high-speed motor 2 is started, and is stopped after t4 seconds after the compressor is stopped, so that the cooling fan 18 cools the aftercooler 4 on one hand and cools the high-speed motor 22 on the other hand, and t4 is larger than t 3. the values of t1, t2, t3 and t4 are determined by the designer of the particular model of ultra-low temperature freezer.
The turbine compressor 3 compresses the low-temperature and low-pressure nitrogen to a high-temperature and high-pressure state, and then the nitrogen is sent into the first high-temperature pipeline 17 through the air outlet of the turbine compressor 3; the high temperature nitrogen then enters the first high temperature inlet 8 of the first recuperator 5 through the outlet of the aftercooler 4 and the second high temperature pipe 19; when the nitrogen passes through the aftercooler 4, the high-temperature nitrogen is blown by the heat-radiating fan 18 to cool the air of the aftercooler 4;
the high-temperature nitrogen enters a second high-temperature inlet 12 through a first high-temperature outlet 9, flows out of the second heat regenerator 6 through a second high-temperature outlet 13, and enters an inlet of the expander 7 through a third high-temperature pipeline 21;
in the expansion machine 7, nitrogen impacts the impeller to do work, so that the power consumption of the high-speed motor 2 is reduced, and the expansion of the nitrogen is facilitated. The high-temperature nitrogen expands to form a low-temperature and low-pressure state; the low-temperature nitrogen enters the refrigerator 1 through the outlet of the expansion machine 7 and the first low-temperature pipeline 22, so that the temperature in the vertical box body is reduced.
The nitrogen enters the first low-temperature inlet 14 of the second heat regenerator 6 through the outlet of the cooler 1 and the second low-temperature pipeline 23, enters the second low-temperature inlet 10 through the first low-temperature outlet 15, and fully exchanges heat between the high-temperature nitrogen and the low-temperature nitrogen in the first heat regenerator 5 and the second heat regenerator 6, so that the overall power consumption of the system is reduced, and the lower expansion temperature and the lower power consumption of the turbine compressor 3 can be obtained.
The low temperature nitrogen enters the inlet of the turbine compressor 3 through the second low temperature outlet 11 via the third low temperature line 25, completing a refrigeration cycle.
Although the present invention has been described in detail with reference to the above embodiments, it should be understood by those skilled in the art that: modifications and equivalents may be made thereto without departing from the spirit and scope of the invention and it is intended to cover in the claims the invention as defined in the appended claims.
Claims (5)
1. The utility model provides a vertical ultra-low temperature freezer, includes vertical box, is equipped with in the vertical box to be used for to the cold ware of using of release in the vertical box, its characterized in that:
a nitrogen refrigerating mechanism is arranged at the vertical box body; the nitrogen refrigeration mechanism comprises a high-speed motor, a turbine compressor, an after-cooler, a first regenerator, a second regenerator and an expander;
the first heat regenerator is provided with a first high-temperature inlet, a first high-temperature outlet, a second low-temperature inlet and a second low-temperature outlet; the first high-temperature inlet is connected with the first high-temperature outlet through an internal high-temperature pipeline of the first heat regenerator, and the second low-temperature inlet is connected with the second low-temperature outlet through an internal low-temperature pipeline of the first heat regenerator;
the second regenerator is provided with a second high-temperature inlet, a second high-temperature outlet, a first low-temperature inlet and a first low-temperature outlet; the second high-temperature inlet is connected with the second high-temperature outlet through an internal high-temperature pipeline of the second heat regenerator, and the first low-temperature inlet is connected with the first low-temperature outlet through an internal low-temperature pipeline of the second heat regenerator;
a power shaft of the high-speed motor is connected with a shaft of the turbine compressor and drives the turbine compressor; the other end of the power shaft of the high-speed motor extends into the expander and is connected with the impeller, the inlet of the expander faces the impeller, and nitrogen passes through the inlet of the expander through a third high-temperature pipeline and then impacts the impeller to assist in driving the power shaft of the high-speed motor to rotate;
the turbine compressor is used for compressing low-temperature low-pressure nitrogen into high-temperature high-pressure nitrogen, a gas outlet of the turbine compressor is connected with a first high-temperature pipeline, the first high-temperature pipeline is connected with an inlet of the aftercooler, and a heat dissipation fan used for blowing ambient air to the aftercooler is arranged adjacent to the aftercooler; the outlet of the aftercooler is connected with the first high-temperature inlet of the first heat regenerator through a second high-temperature pipeline, and the first high-temperature outlet is connected with the second high-temperature inlet of the second heat regenerator through a high-temperature connecting pipe; the second high-temperature outlet is connected with the inlet of the expander through a third high-temperature pipeline, the outlet of the expander is connected with a first low-temperature pipeline, the first low-temperature pipeline is connected with the inlet of the cold using device, the outlet of the cold using device is connected with the first low-temperature inlet of the second heat regenerator through a second low-temperature pipeline, and the first low-temperature outlet is connected with the second low-temperature inlet of the first heat regenerator through a low-temperature connecting pipe;
a second low-temperature outlet of the second heat regenerator is connected with an air inlet of the turbine compressor through a third low-temperature pipeline; the cold-using devices are aluminum tubes with fins and are distributed on the circumferential side wall and the bottom wall of the vertical box body.
2. A vertical ultra-low temperature freezer according to claim 1, wherein: the third low-temperature pipeline is connected with a gas supplementing pipe, a gas supplementing electromagnetic valve is arranged on the gas supplementing pipe, and the tail end of the gas supplementing pipe is connected with a gas supplementing tank for storing nitrogen; the air supply electromagnetic valve is connected with an electric control device which is connected with a high-speed motor.
3. A vertical ultra-low temperature freezer according to claim 1 or 2, characterized in that: the third low-temperature pipeline is connected in series with a low-pressure filter, and the third high-temperature pipeline is connected in series with a high-pressure filter.
4. A vertical ultra-low temperature freezer according to claim 1 or 2, characterized in that: and a plurality of heat exchange tooth edges are arranged on the inner wall of the aluminum calandria tube along the circumferential direction.
5. A vertical ultra-low temperature freezer according to claim 2, wherein: a high-pressure sensor is arranged on the first high-temperature pipeline, and a low-pressure sensor is arranged on the third low-temperature pipeline; the high-voltage sensor and the low-voltage sensor are both connected with an electric control device.
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| CN202110221579.4A CN112856891A (en) | 2021-02-27 | 2021-02-27 | Vertical ultra-low temperature freezer |
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| CN202110221579.4A CN112856891A (en) | 2021-02-27 | 2021-02-27 | Vertical ultra-low temperature freezer |
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| CN114754510A (en) * | 2022-05-20 | 2022-07-15 | 河南新飞制冷器具有限公司 | Quick refrigerating system of inverted Brayton cryobox and operation control method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114754510A (en) * | 2022-05-20 | 2022-07-15 | 河南新飞制冷器具有限公司 | Quick refrigerating system of inverted Brayton cryobox and operation control method thereof |
| CN114754510B (en) * | 2022-05-20 | 2024-04-26 | 河南新飞制冷器具有限公司 | Quick refrigerating system of inverse brayton low-temperature box and operation control method thereof |
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