CN210912428U - Subway air conditioning system based on carbon dioxide transcritical refrigeration cycle - Google Patents
Subway air conditioning system based on carbon dioxide transcritical refrigeration cycle Download PDFInfo
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- CN210912428U CN210912428U CN201921031918.7U CN201921031918U CN210912428U CN 210912428 U CN210912428 U CN 210912428U CN 201921031918 U CN201921031918 U CN 201921031918U CN 210912428 U CN210912428 U CN 210912428U
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Abstract
The utility model relates to a subway air conditioning system based on carbon dioxide transcritical refrigeration cycle, characterized by: the temperature control system comprises a temperature sensor, an air conditioner control unit and a cab controller, wherein the output end of the temperature sensor is connected with the air conditioner control unit, and the air conditioner control unit is respectively connected with the cab controller and the refrigeration system; the refrigerating system adopts a connection mode that two evaporators, two gas coolers and four compressors are connected in parallel, and the temperature in the passenger room is adjusted in a small gradient mode. Has the advantages that: the utility model adjusts the temperature change according to the change of the number of the people in the passenger room; and a natural working medium carbon dioxide refrigerant is also adopted, so that the method has the advantages of environmental protection and safety. Especially, when heat is supplied in winter, the carbon dioxide is used as a refrigerant and has slip temperature when being subjected to heat convection with air, so that the heat supply effect is better.
Description
Technical Field
The utility model belongs to the technical field of warm logical, especially, relate to a subway air conditioning system based on carbon dioxide transcritical refrigeration cycle.
Background
At present, a refrigerating unit in a subway air conditioning system is two sets of subsystems consisting of two compressors, and at least one set of subsystems runs when the refrigerating unit runs. When the passengers in the carriage are few, the passengers can feel that the temperature in the carriage is low and have uncomfortable feeling, and the waste of resources is also caused; when the subway air conditioning system runs at a high load during the peak working and off-duty period, high-temperature protection is generated to delay the starting period of the compressor, and passengers feel that the indoor temperature is high and uncomfortable. Whether an air conditioning system in a carriage needs cooling or heating is generally judged by a driver artificially, so that the difference between the actual temperature in the carriage and the subjective judgment of the driver is caused, and passengers feel uncomfortable when riding. The subway air conditioning system controls the quality of air in a carriage, urban construction develops at a high speed, subway lines are more and more, and the number of people taking the subway is increased continuously, so that higher requirements are provided for the refrigerating effect and effective regulation and control of the subway air conditioning system.
The current subway air conditioning system basically adopts common R22 and R134a refrigerants, the ODP of the refrigerants is small (R22: ODP is 0.034, and R134a is 0), but the GWP of R22 is 1760, and the GWP of R134a is 1300, which easily causes greenhouse effect, damages the ozone layer and damages the environment. At present, carbon dioxide in natural working media is taken as a refrigerant, so that the carbon dioxide has unique advantages and is more widely concerned, and the advantages are as follows: the environment-friendly carbon dioxide has ODP (optical density distribution) of 0 and GWP (global warming potential) of 1; 2. the refrigerant is non-toxic and non-flammable, and is safer as the refrigerant; 3, the volume refrigerating capacity is large; 4. the pressure ratio is low, the heat conductivity is good, and the viscosity is low; 5. low price, low maintenance cost and the like.
Therefore, the refrigerant with environment-friendly property (ODP is 0 and GWP is very small) is adopted while the refrigerating system of the subway air conditioning unit is improved.
SUMMERY OF THE UTILITY MODEL
The utility model provides a subway air conditioning system based on carbon dioxide transcritical refrigeration cycle, which can adjust the temperature in the passenger room with small gradient change to achieve the purpose of comfort for passengers; the natural working medium carbon dioxide is adopted to replace the original refrigerant, and the temperature slippage characteristic of the carbon dioxide as the refrigerant in winter is utilized, so that the heating efficiency is improved, and the heat supply effect is better.
The utility model discloses a realize above-mentioned purpose, realize through following technical scheme, a subway air conditioning system based on carbon dioxide transcritical refrigeration cycle, characterized by: the temperature control system comprises a temperature sensor, an air conditioner control unit and a cab controller, wherein the output end of the temperature sensor is connected with the air conditioner control unit, and the air conditioner control unit is respectively connected with the cab controller and the refrigeration system; the refrigerating system adopts a connection mode that two evaporators, two gas coolers and four compressors are connected in parallel, and the temperature in the passenger room is adjusted in a small gradient mode.
The refrigerating system comprises an evaporator, a heat regenerator, a pressure sensor, four compressors, a gas cooler, a liquid storage device, an expander, an expansion valve, a vapor-liquid separator, a cooling fan, a filter, a drying filter and a four-way reversing valve, wherein the four compressors are connected in parallel in pairs, a high-pressure exhaust port of the compressor after being connected in parallel is connected with a main valve pipe orifice II of the four-way reversing valve, a pipe orifice I of the four-way reversing valve is connected with the vapor-liquid separator and a low-pressure air suction port of the compressor, a pipe orifice III of the four-way reversing valve is connected with an inlet of the heat regenerator, an outlet of the heat regenerator is connected with inlets of the two parallel gas coolers, an outlet of the gas cooler is sequentially connected with the liquid storage device, the drying filter, the heat regenerator and the expander, the expander is connected in parallel with the expansion valve, an outlet of the parallel, and a circulation loop for air conditioning refrigeration and heating is formed.
And a pressure sensor and an electric valve are arranged between the vapor-liquid separator and the low-pressure air suction port of the compressor.
And a pressure sensor and an electric valve are installed at the outlet of the compressor.
And a cooling fan is arranged on the gas cooler.
The evaporator is provided with a blower, and the gas outlet of the evaporator is provided with a filter.
Has the advantages that: compared with the prior art, the utility model discloses lead to the temperature variation because of personnel's quantity variation in according to the guest room, trigger the temperature sensor of carriage internal arrangement, air conditioner the control unit gathers the information that is transmitted by temperature sensor to carry out information processing and procedure to it and judge, and then adjust the compressor that the refrigerating system unit was opened, gas cooler, the quantity and the system operation operating mode load of evaporimeter, guarantee that the interior temperature of guest room changes with less gradient and adjusts, and the passenger feels more comfortable in the carriage. The utility model discloses still adopt natural working medium carbon dioxide to replace former refrigerant, possess more environmental protection (ODP is 0, GWP is 1), nontoxic harmless advantage such as safer. The utility model discloses have the function of heating in summer cooling winter, especially when the heating in winter because there is the temperature of sliding when carbon dioxide is as refrigerant and air convection heat transfer, the heating effect is better.
Drawings
FIG. 1 is a schematic diagram of the operation of the refrigeration system of the present invention;
fig. 2 is a connection block diagram of the temperature control system of the present invention.
In fig. 1: the system comprises a four-way reversing valve 1, a gas-liquid separator 2, a pressure sensor 3, an electric valve 4, a compressor 5, a heat regenerator 6, a cooling fan 7, a gas cooler 8, a liquid storage tank 9, a drying filter 10, an expander 11, an expansion valve 12, an evaporator 13, a filter 14 and a blower 15.
101. The four-way reversing valve comprises a first four-way reversing valve pipe orifice 102, a second four-way reversing valve main valve pipe orifice 103, a third four-way reversing valve pipe orifice 104 and a fourth four-way reversing valve pipe orifice.
Detailed Description
The following detailed description of the embodiments according to the present invention with reference to the preferred embodiments is as follows:
referring to the attached drawing 1 in detail, the embodiment discloses a subway air conditioning system based on carbon dioxide transcritical refrigeration cycle, which comprises a refrigeration system and a temperature control system, wherein the temperature control system comprises a temperature sensor, an air conditioning control unit and a cab controller, the output end of the temperature sensor is connected with the air conditioning control unit, and the air conditioning control unit is respectively connected with the cab controller and the refrigeration system; the refrigerating system adopts a connection mode that two evaporators, two gas coolers and four compressors are connected in parallel, and the temperature in the passenger room is adjusted in a small gradient mode.
The refrigeration system includes: the system comprises a four-way reversing valve 1, a gas-liquid separator 2, a pressure sensor 3, an electric valve 4, a compressor 5, a heat regenerator 6, a cooling fan 7, a gas cooler 8, a liquid storage tank 9, a drying filter 10, an expander 11, an expansion valve 12, an evaporator 13, a filter 14, a blower 15 and the like. The two pipe orifices of the main valve 1 of the four-way reversing valve are connected with a high-pressure exhaust port of the compressor 5, the one pipe orifice of the four-way reversing valve is sequentially connected with the gas-liquid separator 2, the pressure sensor 3 and a low-pressure air suction port of the compressor 5, and the four compressors are connected in parallel two by two. The third pipe orifice of the four-way reversing valve 1 is connected with the inlet of the heat regenerator 6, the outlet of the four-way reversing valve is connected with the inlets of the two gas coolers 8 which are connected in parallel, the outlet of the gas cooler 8 is sequentially connected with the inlets of the liquid storage tank 9, the drying filter 10, the heat regenerator 6, the expander 11 and the expansion valve 12 which are connected in parallel, the outlets of the expander 11 and the expansion valve 12 which are connected in parallel are connected with the inlets of the two parallel evaporators 13, and the outlets of the evaporators 13 which are connected in parallel are connected with the fourth pipe orifice of the four. In the refrigeration system, a blower 15 and a cooling fan 7 are installed on two evaporators, respectively, and a filter 14 is installed at a gas outlet of the evaporator. And a pressure sensor 3 and an electric valve 4 are arranged between the gas-liquid separator 2 and a low-pressure suction port of the compressor and at an outlet of each compressor 5, and the pressure sensor and the electric valve are arranged at inlets of the gas-liquid separator, four compressors connected in parallel in pairs and at an outlet of each compressor. The pressure sensor is more sensitive to pressure change, when the refrigerant is leaked or reduced due to other conditions, the system pressure is abnormally fluctuated, the abnormal change of the system is easier to detect through the pressure sensor control chamber, and then the compressor is closed through the electric valve, so that the compressor is protected. A pressure sensor and an electric valve are also arranged between inlets of the parallel gas coolers, when the refrigerant passes through the compressor and the pressure is abnormally changed, the refrigerant can be reflected to the control room through the sensor, and the compressor is stopped by the valve, so that the safety of the system is protected.
The temperature control system comprises a refrigerating unit, a temperature sensor, an air conditioner control unit and a cab controller, wherein the output end of the temperature sensor is connected with the air conditioner control unit, and the air conditioner control unit is respectively connected with the cab controller and the refrigerating unit.
The working principle is as follows:
when the temperature control system operates, when the flow of people is large, the external temperature is high, the high temperature in the carriage triggers the temperature sensor, the temperature sensor is fed back to the air conditioning control unit to process information, if the temperature reaches a set upper limit, the air conditioning control unit can directly control the refrigerating unit to be fully opened or the temperature sensor feeds back to the controller of the cab through the air conditioning control unit, and a driver can completely open the refrigerating unit. When the passenger flow is small, passengers in the subway are few, the temperature in the carriage is low at the moment, the temperature sensor feeds back the real temperature in the carriage to the air conditioner control unit, the number of the compressors started in the refrigerating unit and the operation working condition load of the compressors are judged, and if only one compressor is started for refrigeration, even the compressor is not started, the passengers can feel comfortable in the carriage and achieve the effect of energy conservation. When the flow of people is large and the number of passengers is variable, the temperature in the carriage is higher but not reaches the maximum set temperature, the temperature sensor feeds back the real temperature in the carriage to the air conditioner control unit for information processing, and the number of the compressors, the evaporators and the gas coolers which are started in the refrigerating unit and the system operation working condition load are judged. According to the practical situation, two or three compressors are started, one or two full-open evaporators and gas coolers are started, and the load of the system operating condition is adjusted at the same time, so that the temperature in the carriage changes in a small gradient, passengers in the carriage feel comfortable in the carriage, the temperature cannot be overheated or overcooled, and the system energy-saving purpose is achieved.
When the refrigeration system operates, low-temperature and low-pressure refrigerants are respectively sucked by the four compressors 5 and are simultaneously compressed into high-temperature and high-pressure supercritical fluid, and then high-temperature and high-pressure carbon dioxide is discharged from the exhaust port, flows to the second pipe orifice of the four-way reversing valve 1 together, flows out of the third pipe orifice of the four-way reversing valve, flows through the heat regenerator 6 and then flows through the gas cooler 8. The high-temperature high-pressure carbon dioxide respectively enters the two gas coolers to exchange heat with the environment, then the low-temperature high-pressure carbon dioxide flowing out of the gas coolers is collected together and enters the liquid storage device 9, flows through the drying filter 10 and the heat regenerator 6, is throttled and depressurized by the expansion valve 11 (a valve in front of the expansion valve 12 is closed), or the valve in front of the expansion valve 12 is opened to close the expansion valve 11 (the valve in front of the expansion valve 11 is closed), the working medium flows through the expansion valve 12 to be throttled and depressurized, at the moment, the low-temperature low-pressure two-phase fluid enters the two evaporators 13, flows to the four-way reversing valve 1 from the outlet, then flows out of the one pipe orifice of the four-way reversing valve 1.
When the heating system operates, the four-way reversing valve is used for changing the flow passage of the refrigerant, changing the flow direction of the refrigerant and converting the functions of the evaporator and the gas cooler in winter and summer, the refrigerant evaporates in the gas cooler 8 (the evaporator in this case) to absorb external heat in winter and releases heat in the evaporator 13 (the gas cooler in this case) for supplying heat in a carriage.
The detailed description of the subway air conditioning system based on carbon dioxide transcritical refrigeration cycle, which is described above with reference to the embodiments, is illustrative and not restrictive, and several embodiments can be enumerated according to the limited scope, so that changes and modifications without departing from the general concept of the present invention shall fall within the protection scope of the present invention.
Claims (6)
1. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle is characterized in that: the temperature control system comprises a temperature sensor, an air conditioner control unit and a cab controller, wherein the output end of the temperature sensor is connected with the air conditioner control unit, and the air conditioner control unit is respectively connected with the cab controller and the refrigeration system; the refrigerating system adopts a connection mode that two evaporators, two gas coolers and four compressors are connected in parallel, and the temperature in the passenger room is adjusted in a small gradient mode.
2. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle as claimed in claim 1, wherein: the refrigerating system comprises an evaporator, a heat regenerator, a pressure sensor, four compressors, a gas cooler, a liquid storage device, an expander, an expansion valve, a vapor-liquid separator, a cooling fan, a filter, a drying filter and a four-way reversing valve, wherein the four compressors are connected in parallel in pairs, a high-pressure exhaust port of the compressor after being connected in parallel is connected with a main valve pipe orifice II of the four-way reversing valve, a pipe orifice I of the four-way reversing valve is connected with the vapor-liquid separator and a low-pressure air suction port of the compressor, a pipe orifice III of the four-way reversing valve is connected with an inlet of the heat regenerator, an outlet of the heat regenerator is connected with inlets of the two parallel gas coolers, an outlet of the gas cooler is sequentially connected with the liquid storage device, the drying filter, the heat regenerator and the expander, the expander is connected in parallel with the expansion valve, an outlet of the parallel, and a circulation loop for air conditioning refrigeration and heating is formed.
3. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle as claimed in claim 2, wherein: and a pressure sensor and an electric valve are arranged between the vapor-liquid separator and the low-pressure air suction port of the compressor.
4. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle as claimed in claim 1 or 2, wherein: and a pressure sensor and an electric valve are installed at the outlet of the compressor.
5. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle as claimed in claim 2, wherein: and a cooling fan is arranged on the gas cooler.
6. A subway air conditioning system based on carbon dioxide transcritical refrigeration cycle as claimed in claim 2, wherein: the evaporator is provided with a blower, and the gas outlet of the evaporator is provided with a filter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921031918.7U CN210912428U (en) | 2019-07-04 | 2019-07-04 | Subway air conditioning system based on carbon dioxide transcritical refrigeration cycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921031918.7U CN210912428U (en) | 2019-07-04 | 2019-07-04 | Subway air conditioning system based on carbon dioxide transcritical refrigeration cycle |
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| CN210912428U true CN210912428U (en) | 2020-07-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921031918.7U Expired - Fee Related CN210912428U (en) | 2019-07-04 | 2019-07-04 | Subway air conditioning system based on carbon dioxide transcritical refrigeration cycle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112277988A (en) * | 2020-12-04 | 2021-01-29 | 石家庄国祥运输设备有限公司 | Air conditioning unit for railway vehicle and control method |
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2019
- 2019-07-04 CN CN201921031918.7U patent/CN210912428U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112277988A (en) * | 2020-12-04 | 2021-01-29 | 石家庄国祥运输设备有限公司 | Air conditioning unit for railway vehicle and control method |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200703 Termination date: 20210704 |