Subway station water-cooling magnetic suspension direct expansion air conditioning system

Abstract

The utility model provides a subway station water-cooling magnetic suspension direct expansion air conditioning system, which relates to the technical field of subway station air conditioners and comprises a water-cooling magnetic suspension direct expansion air conditioning unit, a cooling water loop assembly, an air supply assembly and an air return assembly. The air-conditioning system has the advantages that the water-cooling magnetic suspension direct expansion type air-conditioning unit is used as an air-conditioning cold source of the public area of the station, an air-conditioning chilled water circulation system is omitted, and therefore the land area of an air-conditioning machine room can be saved, and the civil engineering cost of the station is reduced. The fan wall is further arranged on the air conditioner shell of the water-cooling magnetic suspension direct expansion air conditioning unit, a plurality of centrifugal fans are arranged on the fan wall, and therefore a traditional centrifugal fan section can be changed into the fan wall composed of the centrifugal fans, stepless adjustment of air volume can be achieved, equipment is convenient to maintain and repair, and the service life of the equipment is prolonged. And the water-cooling magnetic suspension direct expansion air conditioning unit adopts magnetic suspension compressor oil-free operation, so that the service life of the subway station air conditioning system can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of subway station air conditioning technology, and in particular to a water-cooled magnetic levitation direct expansion air conditioning system for subway stations. Background Technology

[0002] Currently, most subway station ventilation and air conditioning systems use traditional combined air conditioning units, which combine chiller units and chilled water circulation systems as their cold source. This has the following problems:

[0003] 1) The chilled water system requires secondary heat exchange, which poses risks of insulation failure and condensation on the pipes; at the same time, the chiller unit and the combined air conditioning unit are arranged separately, resulting in low overall energy efficiency, with the overall energy efficiency ratio (COP) of the chiller plant generally below 3.0.

[0004] 2) Traditional solutions require the installation of long-distance, large-size ducts, resulting in high energy consumption for fan transmission and distribution. Furthermore, the linkage control of the supply / return exhaust fans is complex, and the adjustment of air balance is difficult.

[0005] 3) Traditional solutions require dedicated chiller rooms and air ducts, which take up a lot of space and result in larger station sizes, which greatly increases the civil engineering costs of subway stations. Utility Model Content

[0006] In view of this, the present invention provides a water-cooled magnetic levitation direct expansion air conditioning system for subway stations, including a water-cooled magnetic levitation direct expansion air conditioning unit, a cooling water loop assembly, an air supply assembly, and a return air assembly.

[0007] The cooling water loop assembly includes a cooling water circulation pipe, a condenser, a cooling water pump, and a cooling tower. The cooling water circulation pipe is connected to the condenser, the cooling water pump, and the cooling tower in sequence. Both ends of the cooling water circulation pipe are connected to a water-cooled magnetic levitation direct expansion air conditioning unit to form a cooling water loop.

[0008] The air supply assembly includes at least two air supply pipes, which extend to the subway concourse level and the subway platform level respectively, and each air supply pipe is provided with at least one air outlet.

[0009] The return air assembly includes a return air inlet, a mixing chamber, and a fresh air pavilion. The return air inlet is provided in both the subway station concourse and the subway platform. The return air inlet is connected to the mixing chamber via a return air duct. The fresh air pavilion is connected to the mixing chamber via a fresh air duct. The mixing chamber is connected to the water-cooled magnetic levitation direct expansion air conditioning unit.

[0010] Furthermore, the water-cooled magnetic levitation direct expansion air conditioning unit includes an air conditioning unit casing, a magnetic levitation compressor, a refrigerant circulation pipe, a throttle valve, and an evaporator. The refrigerant circulation pipe is connected in series with the magnetic levitation compressor, condenser, throttle valve, and evaporator, and both ends of the refrigerant circulation pipe are connected to the evaporator to form a refrigerant circulation loop. The refrigerant circulation pipe is filled with refrigerant. The magnetic levitation compressor, refrigerant circulation pipe, throttle valve, and evaporator are all located inside the air conditioning unit casing.

[0011] Furthermore, the air conditioner casing also includes a fan wall, on which multiple fans are mounted.

[0012] Furthermore, all of the aforementioned fans are EC fans.

[0013] Furthermore, the water-cooled magnetic levitation direct expansion air conditioning system of the subway station includes two sets of water-cooled magnetic levitation direct expansion air conditioning units and two sets of cooling water loop components, each set of cooling water loop components being connected to the water-cooled magnetic levitation direct expansion air conditioning units.

[0014] Furthermore, each of the mixing chambers is equipped with two air inlet pipes, and the mixing chambers are connected to the two air conditioner housings respectively through the two air inlet pipes.

[0015] Furthermore, each air inlet duct is equipped with a first electric air valve.

[0016] Furthermore, the air supply duct includes a main air supply pipe and a branch air supply pipe. The main air supply pipe extends into the subway station concourse level, and the end of the branch air supply pipe is connected to the main air supply pipe, extending into the subway station platform level.

[0017] Furthermore, both the main air supply pipe and the branch air supply pipe are equipped with a second electric air valve.

[0018] Furthermore, a third electric air valve is provided on the return air duct.

[0019] The beneficial effects of this utility model's water-cooled magnetic levitation direct expansion air conditioning system for subway stations are as follows: The air conditioning system includes a water-cooled magnetic levitation direct expansion air conditioning unit, a cooling water loop assembly, an air supply assembly, and a return air assembly. It utilizes the water-cooled magnetic levitation direct expansion air conditioning unit as the cold source for the station's public areas, eliminating the need for a chilled water circulation system. This saves space in the air conditioning room, reduces the length of the subway station by 3-5 meters, and lowers the station's civil engineering costs.

[0020] The air conditioning unit of this water-cooled magnetic levitation direct expansion air conditioning unit also includes a fan wall on the air conditioning unit casing. The fan wall is equipped with multiple centrifugal fans, which can replace the traditional centrifugal fan section with a fan wall composed of EC fans. It can realize stepless adjustment of air volume, and the equipment is easy to maintain and repair. The fans have low starting current and low operating noise. The fan wall adopts a modular design and supports the replacement of individual fans. Furthermore, the water-cooled magnetic levitation direct expansion air conditioning unit uses a magnetic levitation compressor to operate without oil, which can significantly extend the service life of the air conditioning system.

[0021] Meanwhile, the air conditioning system adopts a single-end air supply, negative pressure, and centralized return air scheme, which can significantly improve the operating load rate of air conditioning units in subway stations. This air conditioning system has advantages such as saving civil engineering costs, improving equipment efficiency, and facilitating maintenance and operation, making it suitable for promotion, reference, and application in subway engineering design. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the connection structure of a water-cooled magnetic levitation direct expansion air conditioning system for a subway station, according to an embodiment of this utility model.

[0023] Figure 2 This is a schematic diagram of the fan wall structure of a water-cooled magnetic levitation direct expansion air conditioning system for a subway station, according to an embodiment of this utility model.

[0024] In the above diagram: 1-Fresh air intake; 2-Fresh air duct; 3-Magnetic levitation compressor; 4-Refrigerant circulation pipe; 5-Condenser; 6-Throttle valve; 7-Cooling water circulation pipe; 8-Cooling water pump; 9-Cooling tower; 10-Fan wall; 11-Electric air valve; 12-Air conditioner casing; 13-Evaporator; 14-Air supply outlet; 15-Return air outlet; 16-Mixing chamber; 17-Return air duct; 18-Air supply duct; 19-Fan. Detailed Implementation

[0025] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be further described below with reference to the accompanying drawings.

[0026] Please refer to Figures 1 to 2 The present invention relates to a water-cooled magnetic levitation direct expansion air conditioning system for subway stations, comprising a water-cooled magnetic levitation direct expansion air conditioning unit, a cooling water loop assembly, an air supply assembly, and a return air assembly.

[0027] The cooling water loop assembly includes a cooling water circulation pipe 7, a condenser 5, a cooling water pump 8, and a cooling tower 9. The cooling water circulation pipe 7 is connected in sequence to the condenser 5, the cooling water pump 8, and the cooling tower 9. Both ends of the cooling water circulation pipe 7 are connected to a water-cooled magnetic levitation direct expansion air conditioning unit to form a cooling water loop.

[0028] The air supply assembly includes at least two air supply ducts 18, which extend to the subway concourse level and the subway platform level respectively, and each air supply duct 18 is provided with at least one air outlet 14.

[0029] The return air assembly includes a return air inlet 15, a mixing chamber 16, and a fresh air pavilion 1. The return air inlet 15 is provided in both the subway station concourse level and the subway station platform level. The return air inlet 15 is connected to the mixing chamber 16 through a return air duct 17. The fresh air pavilion 1 is connected to the mixing chamber 16 through a fresh air duct 2. The mixing chamber 16 is connected to a water-cooled magnetic levitation direct expansion air conditioning unit.

[0030] The water-cooled magnetic levitation direct expansion air conditioning unit includes an air conditioning housing 12, a magnetic levitation compressor 3, a refrigerant circulation pipe 4, a throttling valve 6, and an evaporator 13. The refrigerant circulation pipe 4 is connected in series with the magnetic levitation compressor 3, condenser 5, throttling valve 6, and evaporator 13, with both ends of the refrigerant circulation pipe 4 connected to the evaporator 13, forming a refrigerant circulation loop. The refrigerant circulation pipe 4 is filled with refrigerant. The magnetic levitation compressor 3, refrigerant circulation pipe 4, throttling valve 6, and evaporator 13 are all integrated into the air conditioning housing 12. The magnetic levitation compressor 3 can operate without oil and has the advantage of a long service life.

[0031] The air conditioner housing 12 also includes a fan wall 10, on which a plurality of fans 19 are provided.

[0032] In the above structure, the water-cooled magnetic levitation direct expansion air conditioning unit is used to handle the supply air. In the refrigerant circulation loop, the low-temperature and low-pressure gaseous refrigerant is compressed into high-temperature and high-pressure superheated vapor by the magnetic levitation compressor 3. The vapor enters the condenser 5, and the condenser 5 exchanges heat with the cooling water through the heat sink inside, gradually condensing into high-pressure room-temperature liquid refrigerant. The liquid refrigerant flows through the throttling valve 6, forming a low-temperature and low-pressure liquid-gas mixture. The low-temperature refrigerant absorbs indoor heat in the evaporator 13 and completely vaporizes into low-pressure gas, achieving the cooling effect.

[0033] The cooling water loop assembly utilizes circulating cooling water to remove heat. Powered by the cooling water pump 8, the cooling water flows through the condenser 5, absorbing heat to form high-temperature cooling water. This high-temperature cooling water is then pumped to the spray system at the top of the cooling tower 9 to release heat. The condenser of the water-cooled magnetic levitation direct expansion air conditioning unit dissipates heat through the cooling tower and cooling water. Compared to air-cooled units, it maintains high energy efficiency (COP can reach over 6.0) even in high-temperature environments, overcoming the limitations of direct expansion systems in long-distance transport. The cooling water loop assembly eliminates the need for the machine room, pump room, water pipe well, and large ductwork required by traditional air-cooled units, significantly saving air conditioning room space and duct length.

[0034] The airflow path of the air supply component is: fresh air pavilion 1 → fresh air duct 2 → water-cooled magnetic levitation direct expansion air conditioning unit → air supply pipe 18 → air supply outlet 14.

[0035] The mixing chamber 16 of the return air system will form a negative pressure return airflow (the negative pressure is achieved through the exhaust effect of the fan wall 10). The airflow direction is: return air inlet 15 → return air duct 17 → mixing chamber 16. The negative pressure in the mixing chamber 16 ensures the return air flow, which can significantly improve the operating load rate of the water-cooled magnetic levitation direct expansion air conditioning system.

[0036] In a preferred embodiment, all fans 19 are electronically commutated fans (EC fans). The unit replaces the traditional centrifugal fan section with a fan wall composed of EC fans, enabling stepless adjustment of airflow from 10% to 100%, improving fan efficiency, facilitating equipment maintenance, reducing fan starting current, and lowering operating noise. Furthermore, the EC fans are modularly embedded in the fan wall, allowing for individual replacement and easy maintenance.

[0037] In a preferred embodiment, the water-cooled magnetic levitation direct expansion air conditioning system includes two sets of cooling water loop components and two sets of water-cooled magnetic levitation direct expansion air conditioning units connected in parallel. Each set of cooling water loop components is connected to one water-cooled magnetic levitation direct expansion air conditioning unit. That is, the condenser 5 in the cooling water loop component is connected to the refrigerant circulation pipe 4 of the water-cooled magnetic levitation direct expansion air conditioning unit.

[0038] In a preferred embodiment, the water-cooled magnetic levitation direct expansion air conditioning system further includes multiple electric air valves 11. Specifically, each electric air valve 11 includes a first electric air valve, a second electric air valve, and a third electric air valve. The mixing chamber 16 is equipped with two air inlet pipes, which are connected to the two air conditioner housings 12 respectively. Each air inlet pipe is equipped with a first electric air valve. The air supply duct 18 includes a main air supply pipe and branch air supply pipes. The main air supply pipe extends into the subway station concourse level, and the branch air supply pipes are connected at their ends to the main air supply pipes, extending into the subway platform level. Both the main air supply pipe and the branch air supply pipes are equipped with second electric air valves. The return air duct 17 is equipped with a third electric air valve. The first, second, and third electric air valves are all connected to the station's air conditioning control center. The first, second, and third electric air valves are linked and controlled by the air conditioning control center of the subway station, so that the water-cooled magnetic levitation direct expansion air conditioning system can automatically adjust its opening according to the temperature and humidity of the station hall / platform. This allows the air conditioning control center to adaptively control the airflow of the entire water-cooled magnetic levitation direct expansion air conditioning system.

[0039] In this document, the directional terms such as front, back, top, and bottom are defined based on the location of the components in the accompanying drawings and their relative positions to each other, solely for the purpose of clarity and convenience in expressing the technical solution. It should be understood that the use of these directional terms should not limit the scope of protection claimed in this application.

[0040] Where there is no conflict, the above embodiments and features described herein can be combined with each other.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A water-cooled magnetic levitation direct expansion air conditioning system for subway stations, characterized in that: This includes water-cooled magnetic levitation direct expansion air conditioning units, cooling water loop components, air supply components, and return air components; The cooling water loop assembly includes a cooling water circulation pipe (7), a condenser (5), a cooling water pump (8), and a cooling tower (9). The cooling water circulation pipe (7) is connected in sequence to the condenser (5), the cooling water pump (8), and the cooling tower (9). Both ends of the cooling water circulation pipe (7) are connected to the water-cooled magnetic levitation direct expansion air conditioning unit to form a cooling water loop. The air supply assembly includes at least two air supply pipes (18), which extend to the subway concourse level and the subway platform level respectively, and each air supply pipe (18) is provided with at least one air outlet (14). The return air assembly includes a return air inlet (15), a mixing chamber (16), and a fresh air pavilion (1). The return air inlet (15) is provided in both the subway station concourse and the subway station platform. The return air inlet (15) is connected to the mixing chamber (16) through a return air duct (17). The fresh air pavilion (1) is connected to the mixing chamber (16) through a fresh air duct (2). The mixing chamber (16) is connected to a water-cooled magnetic levitation direct expansion air conditioning unit.

2. The system according to claim 1, characterized in that: The water-cooled magnetic levitation direct expansion air conditioning unit includes an air conditioning unit housing (12), a magnetic levitation compressor (3), a refrigerant circulation pipe (4), a throttle valve (6), and an evaporator (13). The refrigerant circulation pipe (4) is connected in series with the magnetic levitation compressor (3), the condenser (5), the throttle valve (6), and the evaporator (13). Both ends of the refrigerant circulation pipe (4) are connected to the evaporator (13) to form a refrigerant circulation loop. The refrigerant circulation pipe (4) is filled with refrigerant. The magnetic levitation compressor (3), the refrigerant circulation pipe (4), the throttle valve (6), and the evaporator (13) are all located inside the air conditioning unit housing (12).

3. The system according to claim 2, characterized in that: The air conditioner housing (12) also includes a fan wall (10), on which a plurality of fans (19) are provided.

4. The system according to claim 3, characterized in that: All of the fans (19) mentioned are EC fans.

5. The system according to claim 2, characterized in that: It includes two sets of water-cooled magnetic levitation direct expansion air conditioning units and two sets of cooling water loop components, with each cooling water loop component connected to one water-cooled magnetic levitation direct expansion air conditioning unit.

6. The system according to claim 5, characterized in that: The mixing chamber (16) is provided with two air inlet pipes, and the mixing chamber (16) is connected to the two air conditioner housings (12) respectively through the two air inlet pipes.

7. The system according to claim 5, characterized in that: Each air inlet pipe is equipped with a first electric air valve.

8. The system according to claim 1, characterized in that: The air supply duct (18) includes a main air supply pipe and a branch air supply pipe. The main air supply pipe extends into the concourse level of the subway station, and the end of the branch air supply pipe is connected to the main air supply pipe. The branch air supply pipe extends into the platform level of the subway station.

9. The system according to claim 8, characterized in that: Both the main air supply pipe and the branch air supply pipe are equipped with a second electric air valve.

10. The system according to claim 1, characterized in that: The return air duct (17) is equipped with a third electric air valve.

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