CN110671848B - Control system of carbon dioxide high-efficiency refrigeration equipment - Google Patents
Control system of carbon dioxide high-efficiency refrigeration equipment Download PDFInfo
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- CN110671848B CN110671848B CN201910982732.8A CN201910982732A CN110671848B CN 110671848 B CN110671848 B CN 110671848B CN 201910982732 A CN201910982732 A CN 201910982732A CN 110671848 B CN110671848 B CN 110671848B
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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
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B49/00—Arrangement or mounting of control or safety devices
- F25B49/02—Arrangement or mounting of control or safety devices for compression type machines, plants or systems
Abstract
The invention discloses carbon dioxideThe control system of the high-efficiency refrigeration equipment comprises a carbon dioxide circulation loop, an ammonia circulation loop and a controller, wherein the carbon dioxide circulation loop comprises an evaporator and CO2The ammonia circulation loop comprises an ammonia gas-liquid separator, an ammonia single-machine two-stage compressor, an oil-gas separator, an ammonia condenser and an ammonia liquid reservoir, wherein a liquefied carbon dioxide condensation control device is arranged in the carbon dioxide circulation loop, and a liquefied ammonia condensation control device is arranged in the ammonia circulation loop. Through baroceptor one, baroceptor two, electromagnetic flow valve one, the stability of atmospheric pressure when guaranteeing the carbon dioxide liquefaction, through making the carbon dioxide liquefaction rate in the condenser keep balance with discharge rate simultaneously to can effectually retrench refrigeration plant's structure, make refrigeration plant structure simpler.
Description
Technical Field
The invention relates to the field of carbon dioxide refrigeration related equipment, in particular to a control system of carbon dioxide high-efficiency refrigeration equipment.
Background
Carbon dioxide is a natural working medium and is a key research direction for replacing CFCs working medium at present. The advantage of using carbon dioxide as the refrigerant and using transcritical cycle is illustrated based on the relative thermophysical and chemical properties of carbon dioxide as the refrigerant and the carbon dioxide refrigeration cycle. The research progress of the key equipment of the carbon dioxide refrigeration cycle system, namely a compressor, an expander, a gas condenser and an evaporator, is introduced, and the application of an automobile air conditioner and a heat pump system which adopt carbon dioxide as a refrigerant is reviewed, so that the development direction of future research is pointed out.
In a carbon dioxide secondary refrigerant refrigeration system and a refrigeration method thereof in patent CN201810603098.8, a high-temperature and high-pressure refrigerant gas generated by a compressor is used to heat a carbon dioxide secondary refrigerant to defrost a refrigeration evaporator, which not only makes full use of the redundant heat of the refrigerant, but also does not need to use an additional defrosting medium, thereby reducing energy consumption and cost.
However, the existing control system of the carbon dioxide refrigeration equipment is insufficient in refrigeration control, and although the refrigeration equipment can accurately perform refrigeration, the structure of the refrigeration equipment is complex and the cost is high.
Disclosure of Invention
The invention aims to solve the problems, designs a control system of carbon dioxide high-efficiency refrigeration equipment, has the function of accurately controlling refrigeration, solves the problems of complexity and high cost of the existing refrigeration equipment control system, and discharges carbon dioxide liquid at a stable speed by controlling the gas-liquid conversion of carbon dioxide in a condenser, thereby effectively reducing the cost of the refrigeration equipment, and simultaneously reducing the structure of the refrigeration equipment, thereby enabling the device to carry out high-efficiency refrigeration.
The technical scheme of the invention is that the control system of the carbon dioxide high-efficiency refrigeration equipment comprises a carbon dioxide circulation loop, an ammonia circulation loop and a controller, wherein the carbon dioxide circulation loop comprises an evaporator and CO2The ammonia circulation loop comprises an ammonia gas-liquid separator, an ammonia single-machine two-stage compressor, an oil-gas separator, an ammonia condenser and an ammonia liquid reservoir, wherein a liquefied carbon dioxide condensation control device is arranged in the carbon dioxide circulation loop, and a liquefied ammonia condensation control device is arranged in the ammonia circulation loop;
the liquefied carbon dioxide condensation control device comprises a cooling cylinder installed below the inside of a condenser, a plurality of cooling pipes are installed on the cooling cylinder, the cooling pipes are evenly distributed on the cooling cylinder, high-temperature high-pressure carbon dioxide gas is installed on the condenser and enters the pipes, the high-temperature high-pressure carbon dioxide gas enters the pipes and is fixedly connected with the cooling pipes, a first electromagnetic flow valve is installed on the high-temperature high-pressure carbon dioxide gas entering the pipes, a first air pressure sensor is installed on one side of the first electromagnetic flow valve, a second air pressure sensor is installed on the other side of the first electromagnetic flow valve, a liquid level sensor is installed on the upper surface inside the cooling cylinder, a first temperature sensor is installed on the lower surface inside the cooling cylinder, a carbon dioxide liquid discharge pipe is installed on the lower surface inside the cooling cylinder, a second temperature sensor is arranged below the inner part of the condenser;
liquefied ammonia condensation controlling means includes ammonia condenser installs the inside below ammonia cooling cylinder, install snakelike ammonia cooling tube on the ammonia cooling cylinder, snakelike ammonia cooling tube and ammonia condenser fixed connection, temperature sensor three is installed to ammonia cooling cylinder inside below, install liquefied ammonia delivery pipe on the ammonia cooling cylinder lower surface, install electromagnetic flow valve three on the liquefied ammonia delivery pipe, the fixed bolster is installed to ammonia condenser one side, install inverter motor on the fixed bolster, the fan leaf of blowing is installed to inverter motor's rotatory end.
The evaporator, CO2The compressor, the filter and the condenser are connected in turn by pipelines,
the ammonia gas-liquid separator, the ammonia single-machine two-stage compressor, the oil-gas separator, the ammonia condenser, the ammonia liquid reservoir and the condenser are sequentially connected through pipelines,
the carbon dioxide liquid in the cooling cylinder is always at a stable liquid level.
The liquefying speed of the high-temperature and high-pressure carbon dioxide gas in the cooling pipe is the same as the carbon dioxide liquid discharging speed of the carbon dioxide liquid discharging pipe.
And a remote controller is arranged outside the controller and is connected with the controller through wireless signals.
And a gas flowmeter is arranged on one side of the high-temperature high-pressure carbon dioxide gas inlet pipe.
And a liquid flowmeter is arranged on the carbon dioxide liquid discharge pipe.
The control system of the carbon dioxide high-efficiency refrigeration equipment manufactured by the technical scheme of the invention has the following beneficial effects:
this control system, through baroceptor one, baroceptor two, electromagnetic flow valve one, carry out the automatic replenishment of high temperature high pressure carbon dioxide gas, thereby the effectual stability of atmospheric pressure when having guaranteed carbon dioxide liquefaction, make carbon dioxide gas more efficient liquefy, detect the speed of carbon dioxide liquefaction simultaneously through level sensor, and control the discharge rate of carbon dioxide liquid through electromagnetic flow valve two, make the carbon dioxide liquefaction speed in the condenser keep balance with discharge rate, thereby can effectually retrench refrigeration plant's structure, make refrigeration plant structure simpler, simultaneously through temperature sensor one, temperature sensor two, the temperature-detecting of temperature sensor three, thereby the temperature of accurate control carbon dioxide liquid emission, make refrigeration effect more accurate.
Drawings
FIG. 1 is a schematic structural diagram of a control system of a carbon dioxide high-efficiency refrigeration plant according to the invention;
FIG. 2 is a schematic view of a liquefied carbon dioxide condensation control apparatus according to the present invention;
FIG. 3 is a schematic view of a liquefied ammonia gas condensation control apparatus according to the present invention;
in the figure, 1, a carbon dioxide circulation loop; 2. an ammonia gas circulation loop; 3. a controller; 4. an evaporator; 5. CO 22A compressor; 6. a filter; 7. a condenser; 8. an ammonia gas-liquid separator; 9. a single-machine two-stage compressor for ammonia gas; 10. an oil-gas separator; 11. an ammonia gas condenser; 12. an ammonia gas reservoir; 13. a cooling cylinder; 14. a cooling tube; 15. a high-temperature high-pressure carbon dioxide gas inlet pipe; 16. a first electromagnetic flow valve; 17. a first air pressure sensor; 18. a second air pressure sensor; 19. a liquid level sensor; 20. a first temperature sensor; 21. a carbon dioxide liquid discharge pipe; 22. a second electromagnetic flow valve; 23. a second temperature sensor; 24. an ammonia gas cooling cylinder; 25. a serpentine ammonia gas cooling tube; 26. a third temperature sensor; 27. a liquefied ammonia gas discharge pipe; 28. a third electromagnetic flow valve; 29. fixing a bracket; 30. a variable frequency motor; 31. a blower blade; 32. a remote controller; 33. a gas flow meter; 34. a liquid flow meter.
Detailed Description
The invention is described in detail below with reference to the accompanying drawings, as shown in FIGS. 1-3, in this embodiment:
in this device, the device is powered by connection to an external power supply, which is connected to the controller 3, the CO2The compressor 5, the ammonia single-machine two-stage compressor 9, the electromagnetic flow valve I16, the electromagnetic flow valve II 22, the electromagnetic flow valve III 28, the variable frequency motor 30, the gas flow meter 33 and the liquid flow meter 34 are electrically connected for supplying power, the controller 3 is an FX1N-40MT-001 PLC, and a control signal output end of the controller 3 is respectively connected with the CO through a transistor2The system comprises a compressor 5, an ammonia single-machine two-stage compressor 9, a first electromagnetic flow valve 16, a second electromagnetic flow valve 22, a third electromagnetic flow valve 28, a variable frequency motor 30, a gas flowmeter 33 and liquidThe body flow meter 34 is electrically connected, and the signal receiving end of the controller 3 is electrically connected with the signal transmitting ends of the first air pressure sensor 17, the second air pressure sensor 18, the liquid level sensor 19, the first temperature sensor 20, the second temperature sensor 23 and the third temperature sensor 26 through transistors, so that the operation of the device is controlled.
The invention is characterized in that the structure design of a liquefied carbon dioxide condensation control device and a liquefied ammonia condensation control device is combined with the attached drawings 1, 2 and 3, the liquefied carbon dioxide condensation control device comprises a cooling cylinder 13 arranged below the inside of a condenser 7, a plurality of cooling pipes 14 are arranged on the cooling cylinder 13, the cooling pipes 14 are uniformly distributed on the cooling cylinder 13, a high-temperature high-pressure carbon dioxide gas inlet pipe 15 is arranged on the condenser 7, the high-temperature high-pressure carbon dioxide gas inlet pipe 15 is fixedly connected with the cooling pipes 14, a first electromagnetic flow valve 16 is arranged on the high-temperature high-pressure carbon dioxide gas inlet pipe 15, a first air pressure sensor 17 is arranged on one side of the first electromagnetic flow valve 16, a second air pressure sensor 18 is arranged on the other side of the first electromagnetic flow valve 16, a liquid level sensor 19 is arranged on the upper surface inside the cooling cylinder 13, a carbon dioxide liquid discharge pipe 21 is arranged on the lower surface of the interior of the cooling cylinder 13, a second electromagnetic flow valve 22 is arranged on the carbon dioxide liquid discharge pipe 21, and a second temperature sensor 23 is arranged below the interior of the condenser 7; the liquefied ammonia condensation control device comprises an ammonia cooling cylinder 24 arranged below the inner part of an ammonia condenser 11, a snakelike ammonia cooling pipe 25 is arranged on the ammonia cooling cylinder 24, the snakelike ammonia cooling pipe 25 is fixedly connected with the ammonia condenser 11, a temperature sensor III 26 is arranged below the inner part of the ammonia cooling cylinder 24, a liquefied ammonia discharge pipe 27 is arranged on the lower surface of the ammonia cooling cylinder 24, an electromagnetic flow valve III 28 is arranged on the liquefied ammonia discharge pipe 27, a fixed support 29 is arranged on one side of the ammonia condenser 11, a variable frequency motor 30 is arranged on the fixed support 29, and a blowing fan blade 31 is arranged at the rotating end of the variable frequency motor 30; the air inflow of the high-temperature and high-pressure carbon dioxide gas inlet pipe 15 is controlled through the first electromagnetic flow valve 16, so that the high-temperature and high-pressure carbon dioxide gas in the cooling pipe 14 is kept under constant air pressure, the liquefaction speed of the carbon dioxide gas is effectively improved, the liquid level variation of liquefied carbon dioxide in the cooling cylinder 13 is detected through the liquid level sensor 19, the liquefaction speed of the carbon dioxide gas is detected, the discharge speed of carbon dioxide liquid is controlled through the second electromagnetic flow valve 22, the liquefaction speed and the discharge speed of the carbon dioxide are the same, the structural complexity of the carbon dioxide circulation loop 1 is effectively reduced, the carbon dioxide circulation loop 1 is simpler, the variable frequency regulation is realized through the variable frequency motor 30, the cooling efficiency of the ammonia condenser 11 is regulated according to actual conditions, and the temperature of liquid ammonia discharged by the ammonia, thereby adjust the inside liquid ammonia temperature of condenser 7, improve the condensation effect of condenser, detect liquefied carbon dioxide's temperature, the inside temperature of condenser 7 and the temperature of liquefied ammonia respectively through temperature sensor one 20, temperature sensor two 23 and temperature sensor three 26 to accurate emission liquefied carbon dioxide makes the more accurate of carbon dioxide refrigeration effect.
The working principle of the device is as follows: first carbon dioxide gas is passed over CO2The compressor 5 compresses low-temperature low-pressure carbon dioxide gas into high-temperature high-pressure carbon dioxide gas, the high-temperature high-pressure carbon dioxide gas is filtered by the filter 6, so that moisture in the high-temperature high-pressure carbon dioxide gas is filtered, the filtered high-temperature high-pressure carbon dioxide gas is condensed by the condenser 7, the high-temperature high-pressure carbon dioxide gas is condensed into carbon dioxide liquid, the carbon dioxide liquid is discharged by the condenser 7 and pushed by the air pressure of the high-temperature high-pressure carbon dioxide gas, the carbon dioxide liquid enters the evaporator 4, the carbon dioxide liquid absorbs heat by evaporation in the evaporator 4, so that the evaporator 4 absorbs external heat and refrigerates the outside, the carbon dioxide liquid is evaporated in the evaporator 4 and then changed into low-temperature low-pressure carbon dioxide gas again, and the carbon dioxide gas is recycled in the carbon dioxide, thereby cooling the outside;
the ammonia gas is compressed by an ammonia gas single-machine two-stage compressor 9, so that the ammonia gas is changed into high-temperature high-pressure ammonia gas from low-temperature low-pressure ammonia gas, the high-temperature high-pressure ammonia gas is separated by an oil-gas separator 10 and then condensed by an ammonia gas condenser 11, the high-temperature high-pressure ammonia gas is condensed by the ammonia gas condenser 11, so that the ammonia gas is changed into low-temperature liquid and enters an ammonia gas liquid reservoir 12, the low-temperature liquid ammonia gas enters a condenser 7, the heat of the high-temperature high-pressure carbon dioxide gas is absorbed, the low-temperature ammonia gas is changed into low-temperature ammonia gas, the low-temperature ammonia gas is discharged from the condenser;
and controlling CO during the first circulation of carbon dioxide2Compressor 5 is started, CO2The compressor 5 compresses carbon dioxide gas into high-temperature and high-pressure carbon dioxide gas, and completely opens the first electromagnetic flow valve 16, at the moment, the high-temperature and high-pressure carbon dioxide gas enters the high-temperature and high-pressure carbon dioxide gas inlet pipe 15 through the first electromagnetic flow valve 16 and enters the cooling pipe 14 and the cooling cylinder 13 through the high-temperature and high-pressure carbon dioxide gas inlet pipe 15, and meanwhile, the single-machine ammonia two-stage compressor 9 is controlled to start working, so that ammonia gas starts to circulate to refrigerate the carbon dioxide gas;
the temperature of the high-temperature high-pressure carbon dioxide gas is reduced through refrigeration of liquefied ammonia gas, so that the high-temperature high-pressure carbon dioxide gas is liquefied and stored in the lower part of the interior of the cooling cylinder 13, and when the liquid level of the carbon dioxide liquid in the lower part of the interior of the cooling cylinder 13 reaches a set value, the control device stops working at the moment;
when the refrigeration temperature is set by the operator through the remote controller 32, the remote controller 32 sends the set refrigeration temperature to the controller 3 through a wireless signal, the controller 3 controls the device to start to operate, and the controller 3 controls the CO2The compressor 5 and the single-ammonia-gas two-stage compressor 9 start to work, and meanwhile, the controller 3 sets the set values of the first temperature sensor 20, the second temperature sensor 23 and the third temperature sensor 26 according to the set temperature;
at the moment, the ammonia starts to refrigerate the carbon dioxide through the ammonia circulation loop 2, the blowing amount of the blowing fan blade 31 is controlled by controlling the rotating speed of the variable frequency motor 30, the temperature of ammonia liquid in the ammonia cooling cylinder 24 in the ammonia condenser 11 is detected through the temperature sensor III 26, and when the temperature of the ammonia liquid reaches a set value, the emission of the ammonia liquid is controlled through the electromagnetic flow valve III 28, so that the ammonia liquid is emitted into the condenser 7 at a certain speed;
at the moment, controlling the first electromagnetic flow valve 16 to be opened, controlling the flow range of the first electromagnetic flow valve 16 to gradually increase, detecting the gas flow of the first electromagnetic flow valve 16 through the gas flow meter 33, when the gas flow of the first electromagnetic flow valve 16 reaches a set value, controlling the first electromagnetic flow valve 16 to stop increasing, detecting the liquid level increasing speed of the carbon dioxide liquid through the liquid level sensor 19, controlling the third electromagnetic flow valve 22 to be opened, gradually increasing the flow range of the electromagnetic flow valve 22, and enabling the liquid level sensor 19 to detect that the carbon dioxide liquid is under a constant liquid level;
at this time, the high-temperature and high-pressure carbon dioxide gas enters the cooling pipe 14 and the cooling cylinder 13 at a stable speed, the constancy of the air pressure is maintained, meanwhile, the high-temperature and high-pressure carbon dioxide gas is liquefied at a constant speed through the refrigeration of ammonia gas liquid, and the liquefied carbon dioxide is discharged at a certain speed, so that the carbon dioxide liquid in the condenser 7 is kept balanced, and the liquefied carbon dioxide is used for refrigerating the external environment through the evaporator 4;
when the operator adjusts the set temperature through the remote controller 32, the controller 3 controls the variable frequency motor 30 and the temperature sensor three 26 to perform corresponding adjustment, controls the electromagnetic flow valve one 16 and the electromagnetic flow valve two 22 to adjust to corresponding flow ranges, and controls the temperature sensor one 20 and the temperature sensor two 23 to adjust to corresponding ranges, so that the liquefied carbon dioxide in the condenser 7 is maintained at a constant liquid level again through automatic adjustment of the system;
keep at a invariable liquid level through carbon dioxide liquid to atmospheric pressure through high temperature high pressure carbon dioxide gas, can be quick impress carbon dioxide liquid and evaporate in evaporimeter 4, also can save device's structure simultaneously, make carbon dioxide refrigeration plant's structure succinct more, reduce refrigeration plant's cost, control refrigeration temperature that simultaneously again can be accurate.
The technical solutions described above only represent the preferred technical solutions of the present invention, and some possible modifications to some parts of the technical solutions by those skilled in the art all represent the principles of the present invention, and fall within the protection scope of the present invention.
Claims (8)
1. A control system of a carbon dioxide high-efficiency refrigeration device comprises a carbon dioxide circulation loop (1), an ammonia circulation loop (2) and a controller (3), wherein the carbon dioxide circulation loop (1) comprises an evaporator (4) and CO2The device comprises a compressor (5), a filter (6) and a condenser (7), wherein the ammonia gas circulation loop (2) comprises the condenser (7), an ammonia gas-liquid separator (8), an ammonia single-machine two-stage compressor (9), an oil-gas separator (10), an ammonia gas condenser (11) and an ammonia gas liquid reservoir (12), and is characterized in that a liquefied carbon dioxide condensation control device is arranged in the carbon dioxide circulation loop (1), and a liquefied ammonia gas condensation control device is arranged in the ammonia gas circulation loop (2);
liquefied carbon dioxide condensation controlling means includes condenser (7) inside below is installed cooling cylinder (13), install a plurality of cooling tubes (14) on cooling cylinder (13), cooling tube (14) evenly distributed is on cooling cylinder (13), it advances pipe (15) to install high temperature high pressure carbon dioxide gas on condenser (7), high temperature high pressure carbon dioxide gas advances pipe (15) and cooling tube (14) fixed connection, high temperature high pressure carbon dioxide gas advances to install electromagnetic flow valve (16) on pipe (15), baroceptor (17) is installed to electromagnetic flow valve (16) one side, baroceptor two (18) are installed to electromagnetic flow valve (16) opposite side, surface mounting has level sensor (19) on cooling cylinder (13) inside, install temperature sensor (20) on the inside lower surface of cooling cylinder (13), a carbon dioxide liquid discharge pipe (21) is mounted on the lower surface inside the cooling cylinder (13), a second electromagnetic flow valve (22) is mounted on the carbon dioxide liquid discharge pipe (21), and a second temperature sensor (23) is mounted below the inside of the condenser (7);
liquefied ammonia condensation controlling means includes ammonia condenser (11) inside below is installed ammonia cooling cylinder (24), install snakelike ammonia cooling tube (25) on ammonia cooling cylinder (24), snakelike ammonia cooling tube (25) and ammonia condenser (11) fixed connection, temperature sensor three (26) are installed to ammonia cooling cylinder (24) inside below, install liquefied ammonia delivery pipe (27) on ammonia cooling cylinder (24) lower surface, install three (28) of electromagnetic flow valve on liquefied ammonia delivery pipe (27), fixed bolster (29) are installed to ammonia condenser (11) one side, install inverter motor (30) on fixed bolster (29), blower fan leaf (31) are installed to the rotatory end of inverter motor (30).
2. Control system of a carbon dioxide high efficiency refrigeration plant according to claim 1, characterized in that the evaporator (4), CO2The compressor (5), the filter (6) and the condenser (7) are connected in sequence through pipelines.
3. The control system of the carbon dioxide high-efficiency refrigeration equipment is characterized in that the ammonia gas-liquid separator (8), the ammonia gas single-machine two-stage compressor (9), the oil-gas separator (10), the ammonia gas condenser (11), the ammonia gas liquid reservoir (12) and the condenser (7) are connected in sequence through pipelines.
4. A control system for a carbon dioxide high efficiency refrigeration plant according to claim 1, characterized in that the carbon dioxide liquid in the cooling drum (13) is always at a steady liquid level.
5. The control system of a carbon dioxide high efficiency refrigerating apparatus as claimed in claim 1, wherein the liquefying rate of the high temperature and high pressure carbon dioxide gas in said cooling pipe (14) is the same as the discharging rate of the carbon dioxide liquid from said carbon dioxide liquid discharging pipe (21).
6. The control system of the carbon dioxide high-efficiency refrigeration equipment is characterized in that a remote controller (32) is arranged outside the controller (3), and the remote controller (32) is connected with the controller (3) through wireless signals.
7. The control system of the carbon dioxide high-efficiency refrigeration equipment according to the claim 1, characterized in that a gas flowmeter (33) is installed at one side of the high-temperature high-pressure carbon dioxide gas inlet pipe (15).
8. A control system of a carbon dioxide high efficiency refrigerating apparatus as claimed in claim 1, wherein said carbon dioxide liquid discharging pipe (21) is installed with a liquid flow meter (34).
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| CN109028629A (en) * | 2018-06-12 | 2018-12-18 | 山东神舟制冷设备有限公司 | A kind of carbon dioxide refrigerating medium refrigeration system and its refrigerating method |
| CN209101596U (en) * | 2018-11-16 | 2019-07-12 | 株式会社前川制作所 | NH3/CO2Refrigerating plant |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10543737B2 (en) * | 2015-12-28 | 2020-01-28 | Thermo King Corporation | Cascade heat transfer system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2010271000A (en) * | 2009-05-25 | 2010-12-02 | Yamato:Kk | Heat storage type refrigerating system |
| CN204358988U (en) * | 2014-11-14 | 2015-05-27 | 武汉新世界制冷工业有限公司 | ammonia and carbon dioxide indirect refrigeration system |
| CN104729135A (en) * | 2015-04-13 | 2015-06-24 | 福建雪人股份有限公司 | CO2/NH3 cascade refrigerating system |
| CN109028629A (en) * | 2018-06-12 | 2018-12-18 | 山东神舟制冷设备有限公司 | A kind of carbon dioxide refrigerating medium refrigeration system and its refrigerating method |
| CN209101596U (en) * | 2018-11-16 | 2019-07-12 | 株式会社前川制作所 | NH3/CO2Refrigerating plant |
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Address after: 528000 208, second floor, No. 8, Zhaoji Road, zone a, Shishan Science and Technology Industrial Park, Shishan town, Nanhai District, Foshan City, Guangdong Province Patentee after: Foshan Nachi Electrical Equipment Co.,Ltd. Address before: No. 6, West Industrial Avenue, Songgang Songxia Industrial Park, Shishan town, Nanhai District, Foshan City, Guangdong Province Patentee before: Foshan Nachi Electrical Equipment Co.,Ltd. |