CN213322835U - Transportation refrigerating plant based on liquid nitrogen - Google Patents
Transportation refrigerating plant based on liquid nitrogen Download PDFInfo
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- CN213322835U CN213322835U CN202021538950.7U CN202021538950U CN213322835U CN 213322835 U CN213322835 U CN 213322835U CN 202021538950 U CN202021538950 U CN 202021538950U CN 213322835 U CN213322835 U CN 213322835U
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Abstract
The utility model discloses a transportation refrigerating plant based on liquid nitrogen, including carriage (3), carriage (3) carry liquid nitrogen storage tank (1) outward through support (2), a plurality of throttle inflation shower nozzles (5) are installed through liquid nitrogen branch pipeline (4) at the top in carriage (3), liquid nitrogen storage tank (1) are connected with cryopump (6), cryopump (6) are connected with liquid nitrogen branch pipeline (4) through supplying nitrogen main line (13), install solenoid valve (7) on supplying nitrogen main line (13), installation thermal resistance thermometer (8) and oxygen gas detection appearance (9) in carriage (3), infrared detection instrument (10) and alarm device are installed to the railway carriage or compartment door department of carriage (3). The transportation refrigeration device utilizes liquid nitrogen to absorb heat in a transportation carriage through the liquid nitrogen gasification through the throttling expansion nozzle, so that the temperature in the carriage is quickly reduced, and the temperature of the carriage is kept in a low-temperature nitrogen environment, thereby achieving the purpose of low-temperature transportation.
Description
Technical Field
The utility model relates to a cold chain transportation technical field specifically is a transportation refrigerating plant based on liquid nitrogen.
Background
With the rapid development of network consumption and the continuous improvement of the living standard of people, the domestic and foreign fresh food market develops rapidly, and especially in 'Shuangele' and '6.18', the consumption of fresh food materials shows the well-jet type growth. The demand of people on fresh food materials greatly stimulates the development of the cold chain transportation industry. However, the development of global cold chain transportation is lagged at present, the increasing material requirements of people are difficult to meet, and the development of the economic society is restricted to a certain extent. The food industry association of china discloses that, because of the imperfect cold chain transportation system, there is 1.3 million tons of waste per year caused by vegetables alone in our country. Transport refrigeration equipment is an extremely important link of cold chain transportation, and at present, the transport refrigeration mainly adopts a mechanical refrigeration mode, so that the problems of high noise, high energy consumption and large carbon emission exist. In order to solve the problems of high noise, high energy consumption and large carbon emission of mechanical refrigeration, the development of an energy-saving and efficient transportation refrigeration device is of great significance.
Disclosure of Invention
The utility model discloses a solve the problem that the mechanical refrigeration noise is big, the energy consumption is high, the carbon emission is big in the cold chain transportation, provide a feasible utilization liquid nitrogen for the refrigerated device of haulage vehicle, the liquid nitrogen passes through throttle expansion nozzle, utilizes the gasification of liquid nitrogen to absorb the heat in the transportation carriage, reduces the interior temperature of carriage fast to carriage temperature keeps at the low temperature state for a long time in making the transportation.
The utility model discloses an adopt following technical scheme to realize:
a transport refrigeration device based on liquid nitrogen comprises a carriage, wherein a liquid nitrogen storage tank is carried outside the carriage through a support, a plurality of throttling expansion spray heads are mounted at the top in the carriage through liquid nitrogen branch pipelines, the liquid nitrogen storage tank is connected with a cryogenic pump, the cryogenic pump is connected with the liquid nitrogen branch pipelines through a nitrogen supply main pipeline, an electromagnetic valve is mounted on the nitrogen supply main pipeline, a thermal resistance thermometer and an oxygen detector are mounted in the carriage, and an infrared detector and an alarm device are mounted at a carriage door of the carriage; the low-temperature pump, the electromagnetic valve, the resistance thermometer, the oxygen detector, the infrared detector and the alarm device are respectively connected with the DCS controller; and a safety valve is arranged at the top of the carriage.
The transportation refrigerating device based on the liquid nitrogen utilizes the liquid nitrogen to pass through the throttling expansion nozzle, gasifies and absorbs heat in the transportation carriage, quickly reduces the temperature in the carriage, keeps the temperature of the carriage in a low-temperature nitrogen environment, and realizes low-temperature transportation. During the use, the liquid nitrogen that comes out from the liquid nitrogen storage tank passes through vacuum pipe and carries to carriage inside top, and the liquid nitrogen pipeline is arranged in the middle of the carriage top to be equipped with the throttle inflation shower nozzle of certain figure. After the liquid nitrogen is throttled and expanded, the temperature and the pressure are reduced sharply, and the liquid nitrogen is gasified to quickly absorb the ambient heat, so that the temperature in the carriage is quickly raised, and the aim of refrigeration is fulfilled. And a DCS controller is arranged outside the carriage, and automatically adjusts the flow of liquid nitrogen through a cryogenic pump and an electromagnetic valve according to the temperature of the carriage, so that the temperature of the carriage is kept within a certain range. The oxygen detector, the infrared detector, the alarm and the DCS controller on the carriage are connected, when the oxygen content is lower than the safe concentration, and when the infrared detector detects that personnel enter the carriage, the alarm gives an alarm to remind the personnel that the personnel cannot enter the carriage, so that the personal safety is ensured. The safety valve is arranged at the top of the carriage, and when the pressure in the carriage exceeds a certain value, the safety valve is automatically opened to ensure the safety in the vehicle.
The utility model has the advantages of as follows:
1. the liquid nitrogen-based transportation refrigeration device utilizes liquid nitrogen throttling gasification to absorb heat in a transportation carriage, and utilizes the throttling expansion nozzle to quickly reduce the temperature in the carriage, so that the temperature of the carriage is kept in a low-temperature nitrogen environment, and low-temperature transportation is realized.
2. The weight of the transportation refrigerating device based on the liquid nitrogen is far lower than that of a mechanical refrigerating device, and the transportation refrigerating device based on the liquid nitrogen has the advantages of no noise, low energy consumption, high cooling speed, low carbon emission and environmental friendliness.
3. In the transportation process, the carriage is in the nitrogen environment, can reduce the oxidation of material, helps giving birth to the fresh-keeping of bright edible material. The liquid nitrogen temperature is-196 ℃, and the method also has certain advantages in freezing and ultralow temperature transportation.
4. The liquid nitrogen transportation refrigerating device has the advantages of low initial investment, simple structure and huge application potential in cold chain transportation of fresh food materials, special medicines and the like. The device is equipped with DCS controller system, has ensured low temperature transportation and personnel's safety.
The utility model relates to a rationally, fine practical application is worth having.
Drawings
Fig. 1 shows a schematic structural diagram of the present invention.
In the figure: the system comprises a liquid nitrogen storage tank 1, a liquid nitrogen support 2, a carriage 3, a liquid nitrogen branch pipeline 4, a throttling expansion nozzle 5, a cryogenic pump 6, a solenoid valve 7, a thermal resistance thermometer 8, an oxygen detector 9, an infrared detector 10, a DCS controller 11, a safety valve 12 and a nitrogen supply main pipeline 13.
Detailed Description
The following describes in detail specific embodiments of the present invention with reference to the accompanying drawings.
A transportation refrigerating device based on liquid nitrogen is shown in figure 1 and comprises a carriage 3, wherein a liquid nitrogen storage tank 1 is carried outside the carriage 3 through a support 2, a plurality of throttling expansion spray nozzles 5 are mounted at the top in the carriage 3 through a liquid nitrogen branch pipeline 4, the liquid nitrogen storage tank 1 is connected with a cryogenic pump 6, the cryogenic pump 6 is connected with the liquid nitrogen branch pipeline 4 through a nitrogen supply main pipeline 13, an electromagnetic valve 7 is mounted on the nitrogen supply main pipeline 13, a thermal resistance thermometer 8 and an oxygen detector 9 are mounted in the carriage 3, and an infrared detector 10 and an alarm device are mounted at a carriage door of the carriage 3; the low-temperature pump 6, the electromagnetic valve 7, the resistance thermometer 8, the oxygen detector 9, the infrared detector 10 and the alarm device are respectively connected with the DCS controller 11; the top of the carriage 3 is provided with a safety valve 12.
The transportation refrigeration device utilizes liquid nitrogen to pass through the throttling expansion nozzle, the liquid nitrogen is gasified to absorb heat in the transportation compartment, the temperature in the compartment is quickly reduced, and the temperature in the compartment is kept in a low-temperature nitrogen environment, so that the purpose of low-temperature transportation is achieved.
When in implementation, the transportation refrigeration device comprises a liquid nitrogen storage tank 1 which is used for storing liquid nitrogen required by refrigeration, and the liquid nitrogen storage tank is fixed on a carriage 3 through a support 2. Liquid nitrogen is carried to the carriage top through supplying nitrogen main line 13, and a plurality of throttle inflation shower nozzles 5 of a certain number install in carriage 3 top arrange placed in the middle through liquid nitrogen branch pipeline 4, supply nitrogen main line 13 and liquid nitrogen branch pipeline 4 to adopt the vacuum pipeline, and the vacuum structure of pipeline helps reducing liquid nitrogen calorific loss. The throttling expansion nozzle 5 consists of a necking structure and a throttling plate with a plurality of small holes, and has the double throttling function. When the liquid nitrogen passes through the throttling expansion nozzle 5, the temperature and the pressure drop sharply, and the ambient heat is absorbed rapidly in the liquid nitrogen gasification process, so that the temperature in the carriage 3 drops abruptly, and the aim of rapid refrigeration is fulfilled. The vacuum pipeline is provided with an electromagnetic valve 7 and a cryogenic pump 6, the cryogenic pump 6 is used for pressurizing liquid nitrogen, and the electromagnetic valve 7 is used for adjusting the flow of nitrogen. A thermal resistance thermometer 8, an oxygen detector 9, an infrared detector 10 and an alarm device are arranged in the carriage 3, the thermal resistance thermometer 8 is used for monitoring the temperature in the carriage in real time, the oxygen detector 9 is used for monitoring the oxygen content in the carriage, the infrared detector 10 is used for detecting the condition that people enter the carriage, the alarm device sends out an acousto-optic alarm signal, the resistance thermometer 8, an electromagnetic valve 7, a low-temperature pump 6, the oxygen detector 9, the infrared detector 10 and the alarm device are connected with a DCS controller 11, and the DCS controller 11 automatically adjusts the flow of liquid nitrogen through the low-temperature pump 6 and the electromagnetic valve 7 so that the temperature in the carriage is kept in a certain range; when the oxygen content is lower than the safe concentration and the infrared detector 10 detects that a person enters the carriage, the alarm device gives an alarm to remind the worker that the person cannot enter the carriage. The liquid nitrogen temperature is-196 ℃, and freezing and ultralow temperature transportation can be realized. The top of the carriage 3 is provided with a safety valve 12, and when the pressure in the carriage 3 exceeds a certain value, the safety valve 12 is automatically opened to ensure the safety in the carriage.
During specific implementation, the liquid nitrogen storage tank can be installed at the bottom of the carriage, the liquid nitrogen storage tank and the outer side of the carriage are both insulated and thermally insulated by adopting a vacuum multilayer structure, the vehicle-mounted weight is reduced, the cold loss is reduced, substances in the carriage can be in a low-temperature state for a long time, and the purposes of quality guarantee and freshness preservation are achieved.
The liquid nitrogen throttling expansion nozzle is composed of a nozzle body with a necking structure and a throttling nozzle with a plurality of small holes, has a double throttling function, and improves the cooling rate. The volume of the liquid nitrogen is increased by 600 times after throttling expansion, the temperature of the carriage can be quickly uniform without ventilation, and the device has the advantages of energy conservation and high efficiency.
The above, only for the practical operation case of the present invention, not to the limitation of the present invention in any form, all the technical content of the present invention is to make any simple modification to the above embodiments, which still belongs to the protection scope of the technical solution of the present invention.
Claims (3)
1. A transport refrigeration unit based on liquid nitrogen, comprising a carriage (3), characterized in that: the system comprises a carriage (3), wherein a liquid nitrogen storage tank (1) is carried outside the carriage (3) through a support (2), a plurality of throttling expansion spray heads (5) are mounted at the top of the inside of the carriage (3) through liquid nitrogen branch pipelines (4), the liquid nitrogen storage tank (1) is connected with a cryogenic pump (6), the cryogenic pump (6) is connected with the liquid nitrogen branch pipelines (4) through a nitrogen supply main pipeline (13), an electromagnetic valve (7) is mounted on the nitrogen supply main pipeline (13), a thermal resistance thermometer (8) and an oxygen detector (9) are mounted in the carriage (3), and an infrared detector (10) and an alarm device are mounted at a carriage door of the carriage (3); the low-temperature pump (6), the electromagnetic valve (7), the resistance thermometer (8), the oxygen detector (9), the infrared detector (10) and the alarm device are respectively connected with the DCS controller (11); and a safety valve (12) is arranged at the top of the carriage (3).
2. A liquid nitrogen based transport refrigeration unit as claimed in claim 1 wherein: and the outer sides of the liquid nitrogen storage tank (1) and the carriage (3) are both of vacuum multilayer heat insulation structures.
3. A liquid nitrogen based transport refrigeration unit as claimed in claim 1 or 2 wherein: the nitrogen supply main pipeline (13) and the liquid nitrogen branch pipeline (4) both adopt vacuum pipelines.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538950.7U CN213322835U (en) | 2020-07-30 | 2020-07-30 | Transportation refrigerating plant based on liquid nitrogen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021538950.7U CN213322835U (en) | 2020-07-30 | 2020-07-30 | Transportation refrigerating plant based on liquid nitrogen |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213322835U true CN213322835U (en) | 2021-06-01 |
Family
ID=76092620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021538950.7U Expired - Fee Related CN213322835U (en) | 2020-07-30 | 2020-07-30 | Transportation refrigerating plant based on liquid nitrogen |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213322835U (en) |
-
2020
- 2020-07-30 CN CN202021538950.7U patent/CN213322835U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210601 |
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| CF01 | Termination of patent right due to non-payment of annual fee |