Airplane ground air conditioner based on pre-cooling device and control method thereof

Abstract

The present disclosure provides an aircraft ground air conditioner based on a pre-cooling device and a control method thereof, and relates to the technical field of airport equipment. The aircraft ground air conditioner based on the pre-cooling device comprises a wind supply system and a temperature control system, the temperature control system comprises a pre-cooling device, a refrigeration device and a heating device, and the pre-cooling device is arranged between the wind supply system and the refrigeration device. The pre-cooling device is used for primary temperature reduction of the gas delivered by the wind supply system, and the refrigeration device is used for secondary temperature reduction of the gas after the primary temperature reduction. According to the multi-stage temperature regulation mode, the present disclosure can reduce the operation energy consumption of the aircraft ground air conditioner, improve the efficiency and flexibility, and support the continuous and stable operation of the aircraft ground air conditioner for a long time without interruption.

Description

Technical Field

[0001] This disclosure relates to the field of airport equipment technology, and in particular to an aircraft ground air conditioner based on a pre-cooling device and its control method. Background Technology

[0002] While an aircraft is on the ground, the comfort of the cabin environment and the heat dissipation needs of electronic equipment typically rely on ground air conditioning units. Especially in scenarios such as overnight flights, long-term maintenance, or high-temperature and high-humidity environments, the ground air conditioning is required to operate continuously and stably, which places high demands on the reliability, energy efficiency, and operating and maintenance costs of the air conditioning system.

[0003] In related technologies, a two-stage refrigeration unit is typically used in series to cool the supplied air. While this method achieves temperature reduction, both refrigeration units consume significant amounts of electricity, resulting in high overall energy consumption and poor operational economy. Secondly, the two-stage refrigeration system has a complex structure and cumbersome control logic, increasing the probability of equipment failure and maintenance difficulty. Furthermore, at high ambient temperatures, the first-stage refrigeration unit experiences a heavy load and reduced efficiency, affecting the overall cooling capacity and system stability. Therefore, how to reduce system energy consumption, simplify the structure, and improve operational reliability while ensuring cooling performance has become a pressing issue.

[0004] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] This disclosure provides an aircraft ground air conditioner based on a pre-cooling device and its control method, which can reduce the operating energy consumption of the aircraft ground air conditioner, improve efficiency and flexibility, and support the long-term uninterrupted continuous and stable operation of the aircraft ground air conditioner based on the pre-cooling device.

[0006] Other features and advantages of this disclosure will become apparent from the following detailed description, or may be learned in part from practice of this disclosure.

[0007] According to one aspect of this disclosure, an aircraft ground air conditioner based on a pre-cooling device is provided, comprising: an air supply system and a temperature control system, the temperature control system including a pre-cooling device, a refrigeration device and a heating device, the air supply system for supplying gas to the temperature control system; the pre-cooling device being disposed between the air supply system and the refrigeration device; the pre-cooling device for performing a primary cooling of the gas supplied by the temperature control system; and the refrigeration device for performing a secondary cooling of the gas after the primary cooling.

[0008] In some embodiments, the precooling device includes a precooler and a first fan, the precooler being connected to the first fan, the first fan being an axial flow fan, the precooler including at least one air inlet and at least one air outlet, at least one air inlet being connected to the air supply system, and at least one air outlet being connected to the refrigeration device, wherein the axial flow fan is used to introduce a natural cold source from the external environment into the precooler, so that the natural cold source exchanges heat with the gas supplied to the refrigeration device by the air supply system when flowing through the precooler, and discharges the heat-absorbing air to the external environment.

[0009] In some embodiments, a first temperature sensor is provided between the precooling device and the refrigeration device to obtain a first temperature of the gas between the precooling device and the refrigeration device.

[0010] In some embodiments, the system further includes a power source, a power system, a driving system, and a control system connected to and used to control the operation of each system; wherein the temperature control system further includes a heating device for heating the gas supplied by the air supply system; the system also includes a movable chassis and a housing mounted on the movable chassis; the housing includes a frame and a panel, the frame being fixed to the movable chassis and the panel being detachably connected to the frame; the movable chassis includes a hollow structure, and the hollow structure and the housing together constitute a space for carrying the power source, the power system, the air supply system, the temperature control system, and the control system.

[0011] In some embodiments, a fan shroud is also included, in which some components of the cooling device and the heating device are located; a second temperature sensor is provided at the outlet of the fan shroud, the second temperature sensor being used to detect a second temperature of the external environment.

[0012] In some embodiments, a fluid flow sensor is provided between the precooling device and the refrigeration device, and a wind pressure sensor is provided at the outlet of the shroud.

[0013] In some embodiments, the refrigeration device includes an evaporator, a condenser, and a compressor; the evaporator is connected to both the condenser and the compressor, the condenser is connected to the compressor, and the compressor is a variable frequency compressor, so that the refrigeration temperature of the refrigeration device is adjustable.

[0014] In some embodiments, the air supply system includes a first filter, a second fan, and a fan frequency converter. The first filter is connected to the second fan, and the fan frequency converter is connected to the second fan for controlling the second fan.

[0015] In some embodiments, a first fan is disposed on the top of the housing, and the air outlet of the first fan is vertically upward; a water-blocking structure is provided on the top of the housing corresponding to the position of the air outlet of the first fan, and the water-blocking structure is connected to a driving mechanism; the driving mechanism is configured to control the water-blocking structure to open in response to the start of the first fan, and to control the water-blocking structure to close in response to the shutdown of the first fan.

[0016] In some embodiments, the device further includes a duct, through which at least one of the air outlets of the precooling device is connected to the refrigeration device.

[0017] In some embodiments, a precooler is disposed at one end of the space, a condenser is disposed adjacent to both sides of the front end of the precooler, a compressor is disposed between the evaporator and the precooler, the evaporator is disposed inside a fan shroud, the fan shroud is disposed above the power supply, the power supply is disposed at the other end of the space opposite to the precooler, and a second fan is disposed outside the condenser.

[0018] In some embodiments, the panel is provided with a first heat dissipation structure corresponding to the condenser, a second heat dissipation structure corresponding to the precooler, a wind valve hole corresponding to the wind valve, a first maintenance hole corresponding to the power supply, and a second maintenance hole corresponding to the temperature control system; a first cover plate is provided corresponding to the wind valve and seals the wind valve hole; a second cover plate is provided corresponding to the power supply and seals the first maintenance hole; and a third cover plate is provided corresponding to the temperature control system and seals the second maintenance hole.

[0019] According to another aspect of this disclosure, a control method for an aircraft ground air conditioning system based on a pre-cooling device is also provided, applied to the aircraft ground air conditioning system based on a pre-cooling device described in any of the preceding claims. The method includes: acquiring a target temperature, a target air volume, a first temperature, and a second temperature, wherein the first temperature is the temperature of the gas between the pre-cooling device and the refrigeration device, and the second temperature is the temperature of the external environment; controlling the air supply system to deliver gas to the temperature control system according to the target temperature and the target air volume; when the first temperature is higher than the target temperature, controlling the pre-cooling device and the refrigeration device in the temperature control system to start, so that the pre-cooling device cools the gas delivered by the air supply system once, and controlling the refrigeration device to cool the gas after the first cooling a second time based on the target temperature, the target air volume, the first temperature, and the second temperature.

[0020] In some embodiments, the method further includes: when the first temperature is lower than the target temperature, controlling the heating device in the temperature control system to start, and controlling the heating device to heat the gas delivered by the air supply system based on the target temperature, the target air volume, the first temperature, and the second temperature.

[0021] In some embodiments, the method further includes: acquiring a pressure value of the refrigeration device; and adjusting the first control parameter of the refrigeration device in response to the pressure value not meeting a pressure protection threshold, wherein the pressure protection threshold is preset.

[0022] In some embodiments, controlling the refrigeration device to perform a secondary cooling of the gas after a first cooling based on the target temperature, the target air volume, the first temperature, and the second temperature includes: determining a first difference between the target temperature and the first temperature; determining a first control parameter of the refrigeration device based on the first difference; and adjusting the first control parameter of the refrigeration device based on the second temperature.

[0023] In some embodiments, controlling the heating device to heat the gas supplied by the air supply system based on the target temperature, the target air volume, the first temperature, and the second temperature includes: determining a first difference between the target temperature and the first temperature; determining a second control parameter of the heating device based on the first difference; and adjusting the second control parameter of the heating device based on the second temperature.

[0024] In some embodiments, controlling the air supply system to deliver gas to the temperature control system based on the target temperature and the target air volume includes: determining a third control parameter of the air supply system based on the target temperature and the target air volume; obtaining a first air volume and a second air volume, wherein the first air volume is the air volume between the precooling device and the refrigeration device, and the second air volume is the air volume of the external environment; and adjusting the third control parameter of the air supply system based on the first air volume and the second air volume.

[0025] According to another aspect of this disclosure, an electronic device is also provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to perform the control method of aircraft ground air conditioning based on a pre-cooling device as described above by executing the executable instructions.

[0026] According to another aspect of this disclosure, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the control method for aircraft ground air conditioning based on a pre-cooling device as described in any of the preceding claims.

[0027] According to another aspect of this disclosure, a computer program product is also provided, comprising: a computer program or instructions that, when executed by a processor, implement the control method for an aircraft ground air conditioning system based on a pre-cooling device as described above.

[0028] This disclosure provides an aircraft ground air conditioning system based on a pre-cooling device and its control method. The pre-cooling system includes an air supply system and a temperature control system. The temperature control system includes a pre-cooling device and a refrigeration device, with the pre-cooling device positioned between the air supply system and the refrigeration device. The pre-cooling device performs a primary cooling of the gas supplied by the air supply system, and the refrigeration device performs a secondary cooling of the gas after the primary cooling. This disclosure utilizes a pre-cooling device to first cool the gas supplied by the air supply system, which initially reduces the gas temperature and lessens the burden on the subsequent refrigeration device. The refrigeration device then performs a secondary cooling, further reducing the gas temperature to a more suitable range. This multi-stage temperature control method can reduce the energy consumption of the aircraft ground air conditioning system, improve efficiency and flexibility, and support long-term, uninterrupted, and stable operation.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0030] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure. It is obvious that the drawings described below are merely some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0031] Figure 1 This illustration shows one of the schematic diagrams of an aircraft ground air conditioning system based on a pre-cooling device according to an embodiment of the present disclosure;

[0032] Figure 2 This is a second schematic diagram illustrating the principle of an aircraft ground air conditioning system based on a pre-cooling device in an embodiment of this disclosure;

[0033] Figure 3 This is the third schematic diagram of an aircraft ground air conditioning principle based on a pre-cooling device in an embodiment of this disclosure;

[0034] Figure 4a This diagram shows one of the structural schematic diagrams of a refrigeration device according to an embodiment of the present disclosure;

[0035] Figure 4b This is a second schematic diagram of the structure of a refrigeration device according to an embodiment of the present disclosure;

[0036] Figure 5a This diagram illustrates a simulation of a duct in one embodiment of the present disclosure.

[0037] Figure 5b This diagram illustrates a duct simulation optimization method according to an embodiment of the present disclosure.

[0038] Figure 6 This diagram illustrates a simulation of a wind shield according to an embodiment of the present disclosure.

[0039] Figure 7 This diagram illustrates a simulation optimization of a windshield in an embodiment of the present disclosure.

[0040] Figure 8 This diagram illustrates an aircraft ground air conditioning architecture based on a precooling device, according to an embodiment of this disclosure.

[0041] Figure 9 This diagram shows a schematic of an aircraft ground air conditioning electrical layout based on a pre-cooling device according to an embodiment of the present disclosure;

[0042] Figure 10 This diagram illustrates a human-machine interface for an aircraft ground air conditioner based on a pre-cooling device, according to an embodiment of this disclosure.

[0043] Figure 11 This illustration shows one of the schematic diagrams of an aircraft ground air conditioning layout based on a precooling device according to an embodiment of the present disclosure;

[0044] Figure 12 This is a second schematic diagram of an aircraft ground air conditioning layout based on a precooling device according to an embodiment of the present disclosure;

[0045] Figure 13 This is shown as the third schematic diagram of an aircraft ground air conditioning layout based on a precooling device in an embodiment of this disclosure;

[0046] Figure 14 This is shown as the fourth schematic diagram of an aircraft ground air conditioning layout based on a precooling device in an embodiment of this disclosure;

[0047] Figure 15 This diagram illustrates a simulation optimization of a movable chassis according to an embodiment of the present disclosure.

[0048] Figure 16 A flowchart illustrating a control method for an aircraft ground air conditioning system based on a pre-cooling device is shown in an embodiment of this disclosure. Detailed Implementation

[0049] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that this disclosure will be more comprehensive and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0050] Furthermore, the accompanying drawings are merely illustrative of this disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted. Some block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different network and / or processor devices and / or microcontroller devices.

[0051] The specific implementation methods of the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0052] Figure 1 This is a schematic diagram of the principle of an aircraft ground air conditioning system based on a pre-cooling device, provided in accordance with an embodiment of this disclosure. Figure 1 As shown, the aircraft ground air conditioning system based on a pre-cooling device provided in this embodiment includes: an air supply system 1 and a temperature control system 2. The temperature control system includes a pre-cooling device 21, a refrigeration device 22, and a heating device 23. The pre-cooling device 21 is disposed between the air supply system 1 and the refrigeration device 22. The air supply system 1 is used to supply gas to the temperature control system 2. The pre-cooling device 21 is used to perform a primary cooling of the gas supplied by the air supply system 1. The refrigeration device 22 is used to perform a secondary cooling of the gas after the primary cooling. The heating device 23 is used to heat the gas supplied by the air supply system.

[0053] In this embodiment, the gas supplied by the air supply system is first cooled by a pre-cooling device, which can initially reduce the gas temperature and reduce the burden on the subsequent refrigeration device. The refrigeration device then performs a second cooling, which can further reduce the gas temperature to a more suitable range.

[0054] In some embodiments, to improve temperature control accuracy and system operation monitoring capabilities, this embodiment also includes multiple sensing components: a first temperature sensor 25 is provided between the precooling device 21 and the refrigeration device 22 to obtain the first temperature of the gas between the precooling device 21 and the refrigeration device 22, and to provide real-time feedback on the cooling effect of the precooling device 21, providing data support for the PLC control system to adjust the parameters of the refrigeration device 22 or the heating device 23.

[0055] In some embodiments, the cooling device 22 and the heating device 23 are located inside the fan shroud 26, and the outlet of the fan shroud 26 is provided with a second temperature sensor 27. The second temperature sensor 27 is used to detect the second temperature of the external environment to ensure that the temperature of the external environment reaches the preset requirements.

[0056] It should be noted that air valves are also installed at key nodes in the air supply path to control the on / off state or adjust the opening of the air supply channel, facilitating equipment start-up and shutdown operations as well as maintenance and repair. Specifically, they can be installed at the outlet of the air hood 26. For example, an air valve 30 can be installed at the outlet of the air hood 26. When the unit is not working, the air valve 30 can be closed to isolate the airflow, prevent external debris from entering the interior of the air hood 26, and ensure the cleanliness of internal components such as the refrigeration unit 22 and the heating unit 23.

[0057] In some embodiments, a fluid flow sensor 28 is provided between the precooling device 21 and the refrigeration device 22, and a wind pressure sensor 29 is provided at the outlet of the fan shroud 26. Specifically, the fluid flow sensor 28 can be a vortex flow meter.

[0058] In some embodiments, the aircraft ground air conditioning system based on the precooling device further includes an air duct 24, and at least one air outlet 2112 of the precooling device 21 is connected to the refrigeration device 22 through the air duct 24. In this embodiment, the precooling device and the refrigeration device are connected by an air duct, and the precooling device and the refrigeration device can operate independently. The system can flexibly adjust the operating status of the two devices according to actual needs, while facilitating equipment installation, maintenance and repair, and reserving space for system expansion or modification.

[0059] In some embodiments, see Figures 1 to 2 As shown, the air supply system 1 includes a first filter 11, a second fan 12 and a fan frequency converter 13. The first filter 11 is connected to the second fan 12, and the fan frequency converter 13 is connected to the second fan 12 to control the second fan 12.

[0060] Specifically, the second fan 12 can be a high-pressure vortex fan. This type of fan has significant high-pressure and low-flow operating characteristics. Based on the high-speed rotation of the impeller, the high-pressure vortex fan achieves rapid gas intake, pressurization and transportation through the strong centrifugal force and thrust generated by the impeller blades.

[0061] In some embodiments, see Figure 2As shown, the air supply system 1 adopts a dual-airflow coupling air supply mode. Its core components include two first filters 11, two high-pressure vortex fans (denoted as first high-pressure vortex fan 12a and second high-pressure vortex fan 12b, collectively referred to as second fans 12), and a fan frequency converter 13. Specifically, the first filters 11 can be high-efficiency filters, which are air purification devices that can efficiently capture fine suspended particulate matter and significantly improve air cleanliness. Using high-efficiency filters as the pre-filter component of the air supply system 1 can significantly improve the cleanliness of the airflow entering the high-pressure vortex fans, preventing dust, particles, and other impurities from entering the fan and causing impeller wear, dust accumulation, and blockage, thus extending the fan's service life. Simultaneously, it can ensure the airflow quality delivered to the precooler and downstream equipment, meeting the stringent requirements of high-precision processes for air supply cleanliness.

[0062] Specifically, each of the two first filters 11 is connected to a corresponding high-pressure vortex blower, with the outlet of the first first filter 11 connected to the inlet of the first high-pressure vortex blower 12a, and the outlet of the second first filter 11 connected to the inlet of the second high-pressure vortex blower 12b. A single blower frequency converter 13 is electrically connected to each of the two high-pressure vortex blowers, enabling centralized control of both blowers. Furthermore, to achieve on / off control and operating condition switching between the two airflow paths, an electric ball valve 14 is installed on the connecting pipe between the two first filters 11. By opening or closing the electric ball valve 14, the airflow supply logic of the air supply system 1 can be flexibly adjusted to adapt to different operating requirements.

[0063] See Figure 2 As shown, the specific operation process and control logic of the air supply system are as follows: After connecting the aircraft ground air conditioner based on the pre-cooling device to the aircraft, the power is turned on and the target air volume, target temperature and other operating parameters are set. The unit is started and the manual air valve is opened, and the unit enters the formal operation state. The PLC (Programmable Logic Controller) control system (not marked separately in the figure) selects the number of high-pressure vortex fans to start according to the actual air supply demand according to the preset program. At the same time, with the help of the fluid flow sensor 28 set on the air duct 24 between the pre-cooling device 21 and the refrigeration device 22, the air supply airflow data is collected in real time. Combined with the air pressure sensor 29 installed at the outlet of the fan cover 26, the air pressure data of the outlet air is collected in real time. The PLC compares and analyzes the collected actual air volume and air pressure data with the target air volume value, and dynamically adjusts the output frequency of the fan frequency converter 13, thereby realizing the automatic and precise adjustment of the air volume.

[0064] After the fan starts and stabilizes, the PLC control system retrieves the real-time first temperature data measured by the first temperature sensor 25, compares and analyzes this first temperature with the target temperature, and determines whether to start the cooling system, start the heating device, or maintain the current air supply status. Specifically, the decision logic can be set as follows: if the first temperature value collected by the first temperature sensor 25 is higher than the target temperature value and the difference reaches a preset threshold, the PLC control system automatically commands the cooling device 22 to start, cooling the airflow. During this process, based on the second temperature data fed back by the second temperature sensor 27 located at the outlet of the fan hood 26, the operating frequency and number of variable frequency compressors in the cooling device 22 can be dynamically adjusted to ensure that the cooling effect accurately matches the preset requirements. If the difference between the temperature value collected by the first temperature sensor 25 and the target temperature value is within the allowable error range, the PLC control system commands neither the cooling device 22 nor the heating device to start, maintaining stable air supply only through the air supply system 1, or activating the pre-cooling device 21 for auxiliary temperature control as needed.

[0065] If the first temperature value collected by the first temperature sensor 25 is lower than the target temperature value, the PLC control system automatically commands the heating device to start. At the same time, combined with the second temperature fed back in real time by the second temperature sensor 27, the output power of the PTC heater is adjusted through the solid-state relay to achieve gradual heating and avoid excessive temperature fluctuations.

[0066] It should be noted that this embodiment does not impose specific restrictions on parameters such as the preset threshold of the PLC control system, the temperature sensing data acquisition interval, and the start-up delay of the cooling / heating device. These parameters can be flexibly configured according to the air supply requirements of different models, changes in ambient temperature, and temperature control accuracy requirements.

[0067] The high-pressure air supply system and the aforementioned control method in this embodiment can flexibly achieve quantitative air volume setting or graded operation. During operation, the system can intelligently adjust the number of high-pressure vortex fans and the operating frequency of each fan according to the real-time air volume demand, ensuring air supply stability while minimizing energy consumption and achieving the goal of energy-saving operation of the entire unit.

[0068] In some embodiments, the precooling device 21 includes a precooler 211 and a first fan 212. The precooler 211 is connected to the first fan 212. The first fan 212 is an axial flow fan. The axial flow fan is used to introduce the natural cold source from the external environment into the precooler so that the natural cold source exchanges heat with the gas supplied by the air supply system 1 to the refrigeration device 22 when it flows through the precooler 211, and discharges the air after absorbing heat to the external environment.

[0069] In this embodiment, when the cooling mode is activated, the pre-cooling device 21 uses an axial flow fan to draw in ambient temperature air from outside, which then exchanges heat with the fresh air that has been pressurized and heated by a high-pressure vortex fan within the pre-cooler 211. The heat from the pressurized fresh air is carried away by a natural cold source and released into the environment, achieving initial cooling and thus providing energy-saving and high-efficiency benefits.

[0070] In some embodiments, see Figures 1-3 As shown, in the structure and connection design of the precooler 211, the precooler 211 includes at least one air inlet 2111 and at least one air outlet 2112. At least one air inlet 2111 is connected to the air supply system 1, and at least one air outlet 2112 is connected to the refrigeration device 22.

[0071] Specifically, the precooler 211 can be configured with a dual air inlet structure, that is, it is provided with two air inlets 2111 (referred to as the first air inlet 2111a and the second air inlet 2111b respectively). The two air inlets 2111 are respectively connected to the air outlets of the two high-pressure vortex fans of the air supply system 1 through a metal flexible connection. That is, the first air inlet 2111a is connected to the air outlet of the first high-pressure vortex fan 12a through the metal flexible connection, and the second air inlet 2111b is connected to the air outlet of the second high-pressure vortex fan 12b through the metal flexible connection.

[0072] The above-mentioned flexible metal connection method can effectively compensate for the displacement deviation between the air supply system 1 and the precooler 211 caused by installation errors and equipment vibration, avoid stress concentration in the pipeline caused by hard connection, reduce the risk of leakage at the pipeline interface, and ensure the airtightness of airflow transmission. On the other hand, the flexible metal connection has good vibration isolation and noise reduction performance, which can weaken the transmission of vibration generated during the operation of the high-pressure vortex fan to the precooler 211, reduce equipment operating noise, and protect the internal precision structure of the precooler 211 from vibration damage, thus extending the service life of the equipment.

[0073] It should be noted that the number of air inlets and the specifications of the metal flexible joints in the precooler 211, such as nominal diameter, working pressure, and temperature tolerance range, can be flexibly adjusted according to actual operating conditions. For example, when the airflow requirement of the air supply system 1 is large, a large-diameter metal flexible joint can be used; when the operating ambient temperature is high, a metal flexible joint made of high-temperature resistant material can be selected to ensure the adaptability and reliability of the connection structure. Furthermore, this embodiment does not restrict the connection method between the metal flexible joint and the precooler air inlet 2111, or the high-pressure vortex blower outlet. Flange connections or clamp connections can be used to further enhance the connection's strength and ease of assembly and disassembly, facilitating subsequent equipment maintenance and repair.

[0074] In some embodiments, the air conditioning system may also be configured with a refrigeration device 22, which may be a direct expansion compression refrigeration system. The direct expansion compression refrigeration system refers to a compression refrigeration system in which the refrigerant directly evaporates and absorbs heat in the evaporator to directly cool the medium being cooled (i.e., the gas transported by the air supply system). It has the characteristics of compact structure, high heat exchange efficiency, and precise temperature control, and is suitable for the operating conditions of aircraft ground air conditioning based on pre-cooling devices.

[0075] Regarding the configuration of the refrigeration unit 22, it can be equipped with two independent refrigeration circuits. Specifically, it can be configured with two compressors and two condensers corresponding to the compressors. Other refrigeration components such as the evaporator, expansion valve, and second filter can be configured either shared or independently according to actual design requirements. This configuration allows for flexible adaptation to different refrigeration loads, improving the stability and redundancy of system operation. It is worth mentioning that the aforementioned evaporator can be placed inside the leak-proof shroud 26, ultimately meeting the aircraft's air supply requirements.

[0076] See Figure 1 and Figure 3 As shown, the refrigeration device 22 includes an evaporator 221, a condenser 222, and a compressor 223. The evaporator 221 is connected to both the condenser 222 and the compressor 223, and the condenser 222 is connected to the compressor 223. The compressor 223 is a variable frequency compressor; by adjusting the operating frequency of the compressor, the cooling temperature of the refrigeration device 22 can be flexibly adjusted to meet the cooling requirements under different operating conditions.

[0077] To meet diverse cooling load demands, adapt to varying operating conditions, and achieve precise supply air temperature control, a fully enclosed variable frequency scroll compressor can be selected. This compressor features stable operation, high energy efficiency, and a wide adjustment range, enabling precise matching of cooling capacity output with actual load requirements. As the core heat dissipation device of the refrigeration system, the condenser, considering both heat exchange efficiency and lightweight design requirements, can utilize a microchannel heat exchanger. An electrophoretic coating can be added to its surface to significantly enhance its salt spray and corrosion resistance, extending the equipment's service life. Compared to traditional copper tube-fin heat exchangers, the heat transfer coefficient of the microchannel heat exchanger can be increased by 5-7 times, while its weight is only about 30% of that of a traditional copper tube-fin heat exchanger, offering significant energy-saving and lightweight advantages. Meanwhile, a detachable connector can be installed on the microchannel heat exchanger, which is connected to the refrigeration pipeline. When the heat exchanger is damaged or malfunctions, it can be easily disassembled for repair or replacement. This type of microchannel heat exchanger is lightweight, usually about 30kg, and can be disassembled, repaired or replaced by a single person, which greatly reduces maintenance costs and difficulty.

[0078] The evaporator can employ a copper tube-fin heat exchanger, with high-quality internally threaded copper tubes used. The design allows for ample space to ensure sufficient heat exchange area and efficiency. The entire evaporator is housed within a leak-proof evaporation duct, effectively preventing refrigerant leaks or condensate overflows from affecting surrounding components and ensuring the stability and safety of the heat exchange process. Refrigeration components include, but are not limited to, expansion valves, secondary filters, solenoid valves, oil separators, and gas-liquid separators.

[0079] Figure 4a and Figure 4b This is a schematic diagram of the structure of a refrigeration device provided in an embodiment of this disclosure, combined with... Figure 4a and Figure 4b As shown, the refrigeration device 22 may include an evaporator 221, a first condenser 222a, a second condenser 222b, a first compressor 223a, a second compressor 223b, a thermostatic expansion valve 224, a refrigeration pipe 225, a gas-liquid separator 226, a liquid receiver 227, a solenoid valve 228, a second filter 229, and an oil separator 230.

[0080] It should be noted that in low-temperature environments, the evaporator surface is prone to frost formation due to the low ambient temperature. Frost formation increases thermal resistance, reduces heat exchange efficiency, and affects the cooling capacity of the refrigeration system. At the same time, low temperatures increase the viscosity of lubricating oil and reduce its fluidity, leading to accelerated wear of internal compressor components and potentially causing problems such as poor refrigerant flow in the pipeline.

[0081] This embodiment can optimize the heat exchange of the evaporator by adjusting the axial flow fan, preventing excessive reduction in heat exchange efficiency due to excessive frost buildup; ensure the normal circulation of refrigerant in the system, and avoid the impact of low temperature on the compressor operation due to lubricating oil viscosity issues; ultimately maintain the stable and efficient operation of the entire refrigeration system in low-temperature environments, ensuring refrigeration effect and extending equipment lifespan.

[0082] In some embodiments, during the design and calculation phase, the evaporator is typically designed with the assumption that the air on its windward side is uniformly distributed when air passes through it, and this is used as the basis for calculating the heat exchanger's heat exchange efficiency and cooling capacity. However, in actual operation, see... Figure 5a The simulated diagram of the air duct shown shows that, due to factors such as the shape design of the air duct, the direction of the pipes and the layout of the components, uneven airflow distribution is likely to occur on the windward side of the evaporator. This causes the actual heat exchange effect of the heat exchanger to deviate from the ideal state of the design calculation, and it cannot fully exert its heat exchange performance, thus affecting the temperature control accuracy and operating efficiency of the whole machine.

[0083] To improve the aforementioned problem of uneven airflow distribution, the structural layout of the shroud 26 needs to be optimized based on the actual duct structure. Specifically, this can be achieved by adding airflow guiding components such as baffles and spoilers to adjust the airflow organization. (See also...) Figure 5bThe diagram showing the optimized air duct simulation is optimized through multiple fluid dynamics simulations and experimental verifications. Several baffles are added inside the air duct corresponding to the evaporator. By using the baffles to block and divert the airflow, the originally uneven airflow is redistributed after passing through the baffles. The airflow organization on the windward side of the evaporator becomes relatively uniform, which is more in line with the airflow uniform distribution conditions preset in the design calculation. This effectively improves the heat exchange efficiency of the evaporator and ensures that the cooling performance of the refrigeration device 22 meets the design expectations.

[0084] It should be noted that this embodiment does not limit the specific number, size, installation position, or tilt angle of the baffles and baffles. They can be flexibly set according to the actual shape of the duct, the specifications of the evaporator, and the specific areas of uneven airflow. Furthermore, during the optimization process, multiple iterations can be made using numerical simulation tools, and the optimization effect can be verified through actual operating condition tests to ensure that the airflow uniformity meets the heat exchange requirements. In addition to adding baffles and baffles, airflow distribution can also be improved by optimizing the duct cross-sectional shape and adjusting the installation spacing of internal components. Specific optimization schemes can be flexibly selected according to actual design requirements.

[0085] In some embodiments, considering that the air pressure of the air supply system 1 is relatively high, the hood 26 will bear a large pressure load, and its pressure bearing capacity and structural stability will be tested. Therefore, it is necessary to conduct strength simulation analysis on the hood 26 and carry out targeted structural reinforcement optimization based on the simulation results, so as to achieve lightweight design as much as possible while ensuring that the hood meets the pressure bearing performance requirements.

[0086] Specifically, under high-pressure air supply conditions, the pressure per unit area of ​​the fan shroud increases with the increase of the supply air pressure, which may lead to deformation of the fan shroud, affecting its sealing performance and service life. (Refer to...) Figure 6 The simulation diagram of the evaporator shroud shown illustrates a high-pressure operating condition. Before optimization, under the preset high-pressure wind pressure, the maximum deformation of the evaporator shroud reached 21.24 mm, and the deformation in other areas was also mostly above 10 mm, failing to meet structural performance requirements. Based on these simulation results, the structure of the evaporator shroud was strengthened and optimized, for example, by optimizing the shroud shell thickness, adding reinforcing ribs, or optimizing the layout of the reinforcing ribs. (Refer to...) Figure 7 The simulation optimization diagram of the wind cover shown shows that after strengthening and optimization, under the same high-pressure wind conditions, the maximum deformation of the wind cover is reduced to 4.55mm. The deformation is significantly reduced, basically meeting the preset structural performance requirements. At the same time, the overall weight of the wind cover is effectively controlled, achieving a balance between performance and lightweighting.

[0087] It should be noted that the air supply pressure and hood deformation values ​​mentioned above are only examples to illustrate the optimization effect. In actual applications, they can be flexibly adjusted according to the air supply parameters of the air conditioning system, the material and structural dimensions of the hood. There are no specific restrictions on the strength simulation analysis method and structural strengthening optimization method of the evaporator hood. Mainstream structural simulation software can be used for analysis, and the strengthening optimization method can also be selected according to the simulation results to ensure that the hood can adapt to the pressure requirements of the actual operating conditions.

[0088] In some embodiments, a high-pressure sensor is installed in the refrigeration unit 22 to monitor the high-pressure of the refrigerant in real time. The actual pressure value collected by the high-pressure sensor is compared with a preset pressure setpoint. If the actual pressure is lower than the setpoint, it indicates that the number or frequency of the axial flow fans needs to be increased to enhance the heat exchange of the evaporator, allowing the refrigerant to evaporate and absorb heat better in the evaporator, thereby increasing the evaporation pressure and thus raising the overall system pressure. If the actual pressure is higher than the setpoint, the number or frequency of the axial flow fans is appropriately reduced to avoid damage to the system caused by excessively high pressure.

[0089] In some embodiments, in addition to the high-pressure sensor, a temperature sensor can also be used to monitor the temperatures of key components such as the evaporator surface temperature and the compressor suction temperature. For example, when the evaporator surface temperature is too low, it may indicate severe frosting. In this case, even if the high-pressure is within the set range, the number or frequency of axial fans can be appropriately increased to enhance the defrosting effect. If the compressor suction temperature is too high, it may be due to poor refrigerant circulation or insufficient heat exchange. In this case, the heat exchange efficiency of the evaporator can be improved by adjusting the axial fans.

[0090] In some embodiments, the heating process in this embodiment adopts a secondary heating mode. Primary heating is achieved using the working characteristics of a high-pressure vortex fan: during the pressurization and delivery of fresh air, the high-pressure vortex fan generates heat energy by doing work, causing the temperature of the fresh air to rise naturally, thus completing the primary heating. Secondary heating is achieved through a heating device 23, which can specifically be a positive temperature coefficient heater (PTC). This PTC heater is composed of a PTC ceramic heating element and an aluminum tube, and has the advantages of low thermal resistance and high heat exchange efficiency. It also features automatic temperature control and energy saving, making it a high-efficiency energy-saving electric heater.

[0091] The specific operating logic is as follows: When the cooling is turned on, the PLC control system calculates the difference between the first temperature collected by the first temperature sensor 25 set between the pre-cooling device 21 and the cooling device 22 and the target temperature, and then selects the number of cooling systems in the cooling device 22 to operate; at the same time, it combines the second temperature data measured by the second temperature sensor 27 to perform feedback adjustment, dynamically adjust the operating frequency of the variable frequency compressor, realize the precise control of cooling output, and ultimately achieve the purpose of accurately controlling the air supply temperature and saving energy.

[0092] Specifically, secondary cooling is achieved through a direct expansion compression refrigeration system, which further cools the fresh air after it has been pre-cooled by the pre-cooling device 21: when the fresh air flows through the evaporator 221, the residual heat in it is absorbed by the refrigerant in the evaporator 221, causing the refrigerant to evaporate and vaporize into low-temperature, low-pressure refrigerant vapor; this refrigerant vapor is drawn into the compressor 223 and compressed, and the high-temperature, high-pressure refrigerant vapor is discharged into the condenser 222; in the condenser 222, the high-temperature, high-pressure refrigerant vapor exchanges heat with the outside ambient air, condenses and releases heat, and the released heat is carried into the outside environment by the outside air; after releasing heat, the refrigerant condenses into a liquid, and after being throttled by the expansion valve, it becomes a low-temperature, low-pressure refrigerant liquid, and re-enters the evaporator 221 to evaporate and absorb heat, thus repeating the cycle to continuously achieve the cooling effect.

[0093] It should be noted that, since this embodiment uses a precooler for pre-cooling, it can effectively reduce the compression and refrigeration load of the entire refrigeration unit, thereby reducing energy consumption while meeting structural size constraints.

[0094] When heating is activated, primary heating is achieved naturally upon the start of the high-pressure vortex fan. If the fresh air temperature after primary heating does not reach the preset temperature, the PTC heater for secondary heating is activated. The control system adjusts the output power of the PTC heater via a solid-state relay based on temperature data collected by the corresponding temperature sensor, achieving precise control of the heating temperature while ensuring energy efficiency. It should be noted that this embodiment does not impose restrictions on the specific location of the temperature sensor or the model and specifications of the solid-state relay, and can be flexibly configured according to actual operating requirements; the power selection of the PTC heater can also be adjusted according to the heating load requirements, demonstrating good adaptability.

[0095] In this embodiment, the cooling / heating method described above provides cold / warm air without any additional preparation work. As long as the power is on, the unit can ensure continuous and stable operation for a long time without interruption, providing strong support for ground service work.

[0096] Figure 8 This is a schematic diagram of an aircraft ground air conditioning architecture based on a pre-cooling device, provided as an embodiment of this disclosure. Figure 8As shown, the aircraft ground air conditioning system based on the precooling device provided in this embodiment of the present disclosure also includes a power supply 3, a power system 4, a driving system 5, and a control system 6 connected to the power supply 3, the power system 4, the driving system 5, the air supply system 1, and the temperature control system 2 and used to control the operation of each system.

[0097] Among them, the power supply 3, as the core of the unit's energy supply, can adopt multiple power supply modes to meet the power needs of different scenarios; the power system 4 is mainly responsible for the conversion and distribution of electrical energy, providing adaptive power for aircraft ground inspection and maintenance and airborne equipment, while also supplying power to the various electrical components of the unit itself; the running system 5, as the installation and load-bearing foundation of the unit, adopts an integrated structural design, taking into account both space utilization and lightweight requirements; the control system 6, through the separation of strong and weak currents and a human-machine interface, realizes precise control, status monitoring, and fault early warning of the unit's operation. In this embodiment, the air conditioning system (including the air supply system and the temperature control system) is independent of the power system, and they do not interfere with each other during operation, and can operate independently or simultaneously.

[0098] For example, the power source 3 may include municipal power and / or generator set power supply. For instance, in scenarios where the airport has a stable municipal power supply, the municipal power supply is used first. In temporary scenarios where there is no municipal power supply, the generator set is used to achieve independent power supply. The power system 4 may consist of a 270V DC power supply and / or a medium-frequency AC power supply, wherein the medium-frequency AC power supply can be selected as 400Hz (adapting to the power needs of most aircraft onboard equipment). This power system can provide power for ground inspection and maintenance and onboard equipment, as well as power for components such as high-voltage vortex fans, PTC heaters, and compressors inside the unit. The driving system 5 adopts an integrated frame-towable mobile chassis. The unit frame and the towable mobile chassis are designed and manufactured as an integrated unit. Compared with a split design, this can effectively improve the space utilization of the unit, while reducing the overall weight of the driving system and making it easier to tow and move.

[0099] The control system 6 consists of a 380V high-voltage power system, a 24V low-voltage power system, and an operation display interface. The 380V high-voltage power system distributes the electrical energy from the power source 3 to high-power components such as the high-pressure vortex fan and compressor. The 24V low-voltage power system serves as the control core, with its internal PLC (Programmable Logic Controller) pre-loaded with preset control programs. By receiving signals from various sensors (such as temperature and pressure sensors), it controls the start / stop and operational parameter adjustments of various components. For example, during heating, the PLC receives data from the temperature sensor and adjusts the output power of the PTC heater via a solid-state relay. The operation display interface enables unit start / stop operations and displays parameters such as supply air temperature, air volume, and system operating status in real time through a high-definition touchscreen human-machine interface (HMI). It also features fault alarm information display and historical fault query functions. Through the overall control of this system, the aircraft ground air conditioning system based on the pre-cooling device can ensure stable and safe operation under various working conditions, while maintaining excellent ease of operation. It should be noted that the 380V high-voltage system and the 24V low-voltage system are integrated in the electrical control cabinet.

[0100] In some embodiments, to ensure that the unit can operate stably, reliably and safely under various operating conditions, the aircraft ground air conditioning based on the precooling device in this disclosure integrates a comprehensive fault monitoring and multi-level protection mechanism.

[0101] Specifically, the control system 6 monitors the operating status across multiple dimensions, including electrical, thermal, and mechanical aspects. It analyzes the input status of the power supply 3 in real time, immediately triggering power fault alarms for anomalies such as phase loss, phase reversal, short circuit, overvoltage, or undervoltage. During the refrigeration cycle, high and low pressure sensors monitor system pressure; if it exceeds safe limits, a high-pressure or low-pressure alarm is generated. Simultaneously, the control system continuously monitors the load and temperature of the high-pressure vortex fan and axial fan motors, issuing alarms in case of overheating or overload. To ensure output conditions meet safety specifications, supply air temperature and pressure are also continuously monitored; exceeding temperature or pressure will trigger corresponding alarms. Furthermore, smoke sensors deployed inside the unit provide early warning of fire risks. All these alarm information are displayed in real time on the human-machine interface (HMI) of the control system 6, accompanied by audible and visual prompts, ensuring operators are aware of faults immediately.

[0102] In some embodiments, the control system 6 employs a strategy combining hardware and software with intelligent adjustment to achieve optimal safety and operational stability. For refrigeration system pressure protection, both software and hardware protection values ​​are set: the PLC has software protection thresholds for high and low pressure; when the pressure reaches these limits, the controller instructs the compressor to stop. Simultaneously, an independent mechanical pressure controller acts directly on the compressor circuit with more stringent hardware settings (higher high pressure, lower low pressure), providing mechanical protection even in the event of control system failure. Furthermore, the control system possesses intelligent adjustment capabilities. When the condensing pressure approaches the software protection value, the PLC automatically adjusts the compressor frequency to unload the system; when the evaporating pressure is too low, it controls the energy regulating valve to open to stabilize the pressure; when starting the refrigeration function in a low-temperature environment, the number and speed of the axial flow fans are precisely controlled to maintain the condensing pressure at a reasonable level, ensuring normal system operation. In heating mode, the power supply circuit of the PTC heater is forcibly interlocked with the operating status of the high-pressure vortex fan, ensuring that the heater can only start working after the fan has started normally, and that the heater power supply is cut off before the fan is turned off, fundamentally preventing the risk of dry burning without airflow. The contactor in the heater circuit is also equipped with an automatic tripping mechanism to avoid contact sticking and ensure reliable power disconnection.

[0103] In some embodiments, Figure 9 This is a schematic diagram of an aircraft ground air conditioning electrical layout based on a pre-cooling device, provided as an embodiment of the present disclosure. The electrical control cabinet, as the core installation carrier of the control system, plays a crucial role in housing electrical components, integrating wiring, and providing operational protection. In this embodiment, the electrical control cabinet adopts a compact and rational layout design. Through scientific planning of the installation positions of components such as the 380V high-voltage system components, the 24V low-voltage control system components (including PLC), solid-state relays, and power distribution modules in the control system, and by optimizing the wiring routing and fixing methods, the internal space utilization of the electrical control cabinet is improved while effectively reducing interference between components and wiring, and facilitating subsequent inspection and maintenance operations.

[0104] To adapt to different ambient temperature conditions and ensure the operational stability of electrical components, the electrical control cabinet is equipped with a dedicated cooling fan and a miniature heater. Specifically, the dedicated cooling fan is linked to a temperature detection element inside the cabinet. When the temperature inside the cabinet rises to a preset upper threshold, the cooling fan automatically starts, accelerating airflow and quickly dissipating the heat generated during the operation of the electrical components. The miniature heater, on the other hand, activates when the ambient temperature is too low, causing the temperature inside the cabinet to fall below a preset lower threshold, actively raising the cabinet temperature. Through the synergistic effect of the cooling fan and the miniature heater, the electrical components can be maintained within a reasonable temperature range, preventing abnormal temperatures from affecting the performance stability and lifespan of the components, thereby ensuring the reliable operation of the air supply system, temperature control system, and other systems within the entire unit.

[0105] In some embodiments, Figure 10 This is a schematic diagram of a human-machine interface (HMI) for an aircraft ground air conditioning system based on a pre-cooling device, provided as an embodiment of this disclosure. This HMI is integrated into the control system's operation display interface and serves as the core interactive platform for operators to perform unit start-up and shutdown, parameter setting, status monitoring, and fault handling. In this embodiment, the HMI adopts a high-definition touchscreen display, featuring high display resolution, sensitive operation response, and strong anti-interference capabilities, making it suitable for complex outdoor and indoor usage scenarios such as airports.

[0106] To enhance ease of operation, the buttons and function modules on the interface are divided into zones according to the core functions of the unit. Specifically, these zones include a core control area, a status monitoring area, a parameter setting area, and a fault handling area. The core control area contains key operation buttons for starting and stopping the air supply system, switching the temperature control system (cooling and heating units), and selecting the power system mode. The status monitoring area displays real-time operating parameters such as air supply volume, supply air temperature, temperature inside the electrical control cabinet, and power system voltage. The parameter setting area allows for flexible setting of parameters such as supply air temperature threshold, target air volume, and temperature control range of the electrical control cabinet. The fault handling area displays the fault type, fault location, and preliminary handling suggestions, and supports querying historical fault records. The boundaries of each functional zone are clearly defined and clearly labeled, allowing operators to quickly locate the required functions without complex training, effectively improving operational efficiency.

[0107] It should be noted that this embodiment does not limit the specific model, installation location, or start / stop temperature threshold of the dedicated cooling fan and micro heater inside the electrical control cabinet. These can be flexibly configured according to the specifications and dimensions of the electrical control cabinet, the heating power of internal components, and the actual operating temperature range. Similarly, the size, display resolution, number of button zones, and specific functional module layout of the HMI high-definition touchscreen are not specifically limited. The design can be optimized based on the actual functional requirements of the unit, the operating habits of the operators, and the operational requirements of the compatible aircraft model. Furthermore, the protection level of the electrical control cabinet can be adapted and adjusted according to the environmental conditions of the operating scenario (such as humidity, dust, salt spray, etc.). The human-machine interface can be equipped with password unlocking, access control, and other functions to further enhance the security of equipment operation. All of the above are within the scope of protection of this disclosure.

[0108] In addition, the specific parameters mentioned above, such as power specifications, space utilization improvement rate, and weight reduction rate, are only examples used to illustrate the functions and advantages of each system. In actual applications, they can be flexibly adjusted according to the unit's power requirements, installation space limitations, and compatible aircraft models. There are no specific restrictions on the power supply combination method, power system voltage level, specific structural form of the driving system, and hardware and software configuration of the control system. Adaptive solutions can be selected according to actual design requirements.

[0109] Figures 11 to 14 This illustration shows a schematic diagram of an aircraft ground air conditioning layout based on a pre-cooling device, as shown in the embodiment of this disclosure. Figures 11 to 14 As shown, the aircraft ground air conditioner based on the pre-cooling device provided in this embodiment includes a movable chassis 7 and a housing 8 installed on the movable chassis 7. The overall structure is compact and easy to move to the site.

[0110] In some embodiments, the movable chassis 7 serves as both the mounting carrier for all major components of the aircraft ground air conditioning system based on the pre-cooling device and a vehicle-mounted unit, achieving integration and mobility of the aircraft ground air conditioning unit. The movable chassis 7 can consist of pneumatic tires, a steering mechanism, a traction device, and a braking system. Its core parameters are adapted to airport site requirements: for example, a maximum load capacity of 4 tons, capable of stably supporting all components and equipment of the aircraft; a standard towing pole for the traction device, compatible with conventional towing equipment, with a maximum towing speed of 25 km / h, meeting the efficiency requirements for short-distance movement within the airport; a rear-wheel fixed, front-axle steering layout, with pneumatic tires on the rear wheels providing good ground adaptability and cushioning performance; and a front-axle steering mechanism to enhance the flexibility of the aircraft during movement. It is also equipped with a friction locking mechanism, featuring a linkage braking function when the towing operation is completed and the towing pole is erected. That is, when the towing operation is completed and the towing pole is erected, the braking system automatically activates and locks, effectively preventing accidental slippage of the movable chassis and improving parking safety.

[0111] It should be noted that the structural strength of the movable chassis 7 directly determines the stability and safety of the unit during operation and movement, and the rationality of the design needs to be verified through structural strength simulation analysis. (See also...) Figure 15 As shown, simulation analysis can clearly demonstrate that the strength of the movable chassis body meets the preset requirements. At the same time, it can accurately identify the impact of excessive local loads on the movable chassis structure, and then optimize the local structure in a targeted manner (such as adding reinforcing ribs, optimizing material distribution, etc.) to achieve lightweight design while ensuring that the strength meets the standards.

[0112] Specifically, the enclosure 8 consists of a frame 81 and a panel 82. The frame 81 serves as the load-bearing skeleton of the enclosure 8 and can be fixed to the movable chassis 7 by welding, bonding, or mechanical screwing, ensuring a secure connection and adaptability to different processing requirements. The panel 82 and the frame 81 are detachably connected, facilitating later inspection and maintenance of the internal components. The movable chassis 7 is designed with a hollow structure, which, together with the enclosure 8, forms a closed installation space to support core components such as the power supply, power system, air supply system, temperature control system, and control system, achieving integrated layout of various systems.

[0113] Specifically, the aircraft ground air conditioning system based on the pre-cooling device provided in this embodiment adopts an integrated frame-towable movable chassis 7. This movable chassis 7 serves as the core load-bearing body of the unit, and its frame is welded from 3mm thick high-strength carbon steel square tubing, possessing sufficient load-bearing strength to meet the weight requirements of various components of the unit. The housing 8, which cooperates with the movable chassis 7, consists of a frame 81 and a panel 82. The frame 81 serves as the load-bearing skeleton of the housing 8, and its key structures such as side beams and top beams can be made of 2mm thick bent carbon steel plates welded to square tubing. The cover plates around the frame 81 are made of 1.0mm carbon steel plates, and reinforcing ribs can be designed on the cover plates according to strength requirements to further improve the structural stability of the frame 81. The panel 82 is connected to the frame 81 by hinges, and the fixing method can be a door lock or bolt fixation, ensuring both a firm connection and flexible opening or disassembly, facilitating later inspection and maintenance of the internal components. The frame 81 can be fixed to the movable chassis 7 by welding, bonding or mechanical screwing, which can adapt to different processing requirements and the connection is reliable.

[0114] It should be noted that after the integrated frame-towable mobile chassis 7 and the enclosure are manufactured, they can be further sandblasted to remove surface weld slag and oil stains, while also eliminating structural stress and increasing surface roughness, thereby improving the adhesion of subsequent coatings. The coating protection can employ a two-layer spraying process: first, a layer of 80-120μm thick epoxy zinc-rich primer is sprayed; after the primer has dried completely, a layer of 80-120μm thick aliphatic topcoat is then sprayed, effectively improving the corrosion resistance of the mobile chassis and enclosure, making it suitable for complex operating environments such as airports and outdoor spaces.

[0115] For details on the specific distribution of the core components inside the enclosure, please refer to [link / reference]. Figures 11 to 12 As shown: the precooler 211 is located at one end of the installation space, occupying a major position at the end as the core component for airflow precooling; the condenser 222 adopts a symmetrical layout, arranged adjacent to each other on both sides of the front end of the precooler 211, forming a dual condenser configuration to improve heat dissipation efficiency; the compressor 223 is arranged between the evaporator 221 and the precooler 211, shortening the length of the refrigeration pipeline and reducing cooling loss; the evaporator 221 is located inside the fan shroud 26, which is entirely mounted on the power supply unit 41, realizing the layered utilization of space; the power supply unit 41 is located in the installation space and adjacent to the precooler 211. At the opposite end of the cooler 211, a symmetrical arrangement is formed with the precooler 211 to balance the overall weight of the unit. The second fan 12 is located outside one of the condensers 222 to accelerate air circulation around the condenser 222 and enhance heat dissipation. In addition, the first fan 212 is located on the top of the housing 8 with its air outlet pointing vertically upward to facilitate the exhaust of pre-cooled and heat-exchanged air or the introduction of natural cold sources. The fan inverter 13 is located on the movable chassis 7 between the power supply unit 41 and the condenser 222, and the refrigeration pipe 225 can be arranged on the fan inverter 13. Furthermore, a first power interface 42 and a second power interface 43 are respectively provided on both sides of the movable chassis 7. It should be noted that this embodiment does not limit the number of power interfaces. For example, there is one first power interface 42 and three second power interfaces 43.

[0116] To adapt to outdoor use scenarios and improve the device's rainproof performance, please refer to [link / reference]. Figures 13 to 14 As shown, a water-blocking structure 821 is provided on the top of the housing 8 corresponding to the air outlet of the first fan 212. This water-blocking structure 821 is connected to a drive mechanism (not shown in the figure). The drive mechanism is configured to have a linkage control function, that is, in response to the start signal of the first fan 212, it automatically controls the water-blocking structure 821 to open, ensuring that the first fan 212 can normally intake or exhaust air; in response to the stop signal of the first fan 212, it automatically controls the water-blocking structure 821 to close, preventing rainwater from entering the housing 8 through the air outlet and damaging the electrical components or other core components inside the housing. It should be noted that the drive mechanism can be of various forms, such as motor drive or cylinder drive, and can be flexibly configured according to actual design requirements.

[0117] In some embodiments, the panel 82 adopts a functionally adaptable layout in its structural design, with various functional structures and maintenance structures corresponding to the positions of the core components inside the enclosure, to take into account the needs of heat dissipation, operation, and maintenance. Specifically, the panel 82 is provided with a first heat dissipation structure corresponding to the condenser 222, a second heat dissipation structure 823 corresponding to the precooler 211, a damper hole corresponding to the damper 30, a first maintenance hole corresponding to the power supply unit 41, and a second maintenance hole corresponding to the temperature control system; at the same time, a first cover plate, a second cover plate, and a third cover plate 829 are provided, wherein the first cover plate is provided corresponding to the damper 30 and seals the damper hole; the second cover plate is provided corresponding to the power supply unit 41 and seals the first maintenance hole; and the third cover plate 829 is provided corresponding to the temperature control system 2 and seals the second maintenance hole.

[0118] When using a configuration such as the dual condenser 222, please refer to the details. Figures 13 to 14 As shown: The first heat dissipation structure is set corresponding to the condenser 222, and is used to provide a heat dissipation channel for the condenser 222. Since there are two condensers 222 in the box, the first heat dissipation structure includes a first sub-heat dissipation structure 822a and a second sub-heat dissipation structure 822b, which correspond one-to-one with the two condensers 222. The first sub-heat dissipation structure 822a and the second heat dissipation structure 822b can adopt louvers as an example implementation method. The louver structure realizes air circulation and heat dissipation, and also has a certain dustproof and rainproof effect. In practical applications, other structural forms such as grille type and perforated plate type can also be selected, and can be flexibly adjusted according to the use environment and heat dissipation requirements.

[0119] An operation panel 826 is pre-positioned on panel 82. This operation panel 826 integrates the aforementioned HMI high-definition touchscreen, serving as the core interface for operator interaction with the unit. It facilitates daily operations such as unit start / stop, mode switching, and parameter viewing, enhancing operational convenience. The air conditioning system electrical control cabinet 827, corresponding to the aforementioned electrical control cabinet, is located below the operation panel 826. It effectively protects the internal electrical components, isolating them from external dust and moisture interference, and allows operators convenient access for maintenance and repair.

[0120] The first cover plate is positioned corresponding to the air valve 30 and is used to block the air valve hole corresponding to the air valve 30. Combined with the dual air valve 30 configuration of the air cover 26, the first cover plate can be divided into a first sub-cover plate 824a and a second sub-cover plate 824b, which are adapted to the two air valves 30 respectively. It adopts a detachable structure design to take into account both the daily protection and later maintenance needs of the air valves 30. It should be noted that, in order to improve the convenience of maintenance, a first maintenance hole is provided on the enclosure corresponding to the installation position of the power supply unit 41. Correspondingly, the second cover plate can be divided into a third sub-cover plate 825a and a fourth sub-cover plate 825b, which respectively block the first maintenance holes on both sides, to achieve targeted protection of the power supply unit 41 and prevent external debris from entering the power supply installation area. The third cover plate 829 is positioned corresponding to the temperature control system and is used to block the second maintenance hole corresponding to the temperature control system, such as for the maintenance of the refrigeration pipes, inverter, and other temperature control system components of the refrigeration unit 22. In some embodiments, a fourth cover plate 830 is also provided near the precooler 211. A fresh air intake structure 828 is also provided on the same side as the second heat dissipation structure 823.

[0121] It should be noted that the number, layout, size, and connection method (such as bolt connection, snap-fit ​​connection, magnetic connection, etc.) of the various functional structures and cover plates mentioned in this embodiment are not specifically limited. As long as they can meet the functional requirements of the internal components, ensure stable operation of the equipment, and improve the convenience of operation and maintenance, they are all within the protection scope of this disclosure.

[0122] Based on the same inventive concept Figure 16 This invention discloses a flowchart of a control method for an aircraft ground air conditioning system based on a pre-cooling device, as shown in the embodiments of the present disclosure. Figure 16 As shown in the embodiments of this disclosure, a control method for an aircraft ground air conditioning system based on a pre-cooling device includes the following steps:

[0123] S162, acquire the target temperature, target air volume, first temperature and second temperature.

[0124] The target temperature is a preset supply air temperature, and the target air volume is a preset supply air flow rate. Both the target temperature and target air volume can be flexibly adjusted via the operation panel on the aircraft ground air conditioning system based on the pre-cooling device. The first temperature is the temperature of the gas between the pre-cooling device and the refrigeration device, which is acquired by a temperature sensor installed between the outlet of the pre-cooling device and the inlet of the refrigeration device. The second temperature is the temperature of the external environment after adjustment by the temperature control system, also known as the dry-bulb temperature, which is acquired by a second temperature sensor. The signals acquired by the temperature sensor and the air volume sensor are transmitted in real time to the PLC controller, which is the core component of the electrical control cabinet and can complete the acquisition and preprocessing of parameters.

[0125] For example, during cooling, the second ambient temperature is 35°C, the target temperature is 10°C, and the target relative humidity and the relative humidity of the ambient environment are further determined, for example, the relative humidity of the ambient environment is 70%, and the target relative humidity is 90%; the heating mode is preset to 60°C; the target air volume is set to 2200m³ / h; the first temperature in the cooling mode is the pre-cooled air temperature, which is approximately 48°C in actual measurement.

[0126] It should be noted that although the physical quantities directly acquired and regulated by the control system are the target temperature, target airflow, first temperature, and second temperature, one of the final target parameters can also include relative humidity. This is because in the cooling operation of aircraft ground air conditioning based on pre-cooling devices, the air supply conditions refer not only to the dry-bulb temperature (e.g., 10°C) but also to humidity parameters (e.g., 90% relative humidity). Specifically, temperature control and humidity control are deeply coupled and inseparable in the actual cooling and dehumidification process. Simply controlling the air supply temperature to 10°C does not guarantee that the humidity will reach 90%; similarly, without temperature control, it is impossible to define the specific moisture content corresponding to 90% relative humidity. Therefore, the preset target relative humidity (e.g., 90%) and target temperature (10°C) together define a unique air state point. This state point corresponds to a specific moisture content and enthalpy value.

[0127] S164 controls the air supply system to deliver gas to the temperature control system based on the target temperature and target air volume.

[0128] In this embodiment, the air supply system uses a high-pressure vortex fan as an example, and its operating status is regulated by a third control parameter. The third control parameter is a key parameter to ensure the stability of the air supply, and may include the fan speed, inverter frequency, etc. The values ​​of these parameters directly determine the stability of the air supply pressure and air volume, and thus affect the subsequent temperature control effect.

[0129] In some embodiments, controlling the air supply system to deliver gas to the temperature control system according to the target temperature and the target air volume includes: determining a third control parameter of the air supply system according to the target temperature and the target air volume; obtaining a first air volume and a second air volume, wherein the first air volume is the air volume of the air between the precooling device and the refrigeration device, and the second air volume is the air volume of the outside air after passing through the temperature control system; and adjusting the third control parameter of the air supply system according to the first air volume and the second air volume.

[0130] Specifically, firstly, the initial value of the third control parameter of the air supply system is determined by combining the target temperature, target air volume, and the "air volume-load" matching relationship. Secondly, the first and second air volumes are collected in real time. The first air volume refers to the air volume between the pre-cooling unit and the refrigeration unit, and the second air volume refers to the final supply air volume. Both are collected by the vortex flow meter and the air pressure sensor mentioned above. The vortex flow meter is installed on the air duct between the pre-cooling unit and the refrigeration unit and can accurately monitor the air volume data of different sections, thereby realizing real-time monitoring of losses during air volume transmission. Finally, the third control parameter is dynamically adjusted according to the deviation between the first and second air volumes to ensure that the final supply air volume is stable near the target value, while offsetting the air volume fluctuations caused by pipeline resistance and component losses, and ensuring the accuracy of the flow benchmark in load calculation.

[0131] It should be noted that the high-pressure vortex fan will generate a temperature rise during operation due to pressurization. This temperature rise needs to be offset by a temperature control system in cooling mode, while in heating mode it can be used as the first stage of heat recovery. For example, taking the condition of an outlet air pressure of 36 kPa as an example, according to relevant test data, the temperature rise caused by the pressurization of the high-pressure vortex fan is approximately 55°C.

[0132] S166, when the first temperature is higher than the target temperature, the precooling device and the refrigeration device in the temperature control system are started so that the precooling device cools the gas delivered by the air supply system once, and the refrigeration device is controlled to cool the gas after the first cooling based on the target temperature, target air volume, first temperature and second temperature.

[0133] In some embodiments, controlling the refrigeration device to perform a secondary cooling of the gas after a first cooling based on the target temperature, target air volume, first temperature, and second temperature may include: determining a first difference between the target temperature and the first temperature; determining a first control parameter of the refrigeration device based on the first difference; and adjusting the first control parameter of the refrigeration device based on the second temperature.

[0134] In this embodiment, the first control parameter includes parameters of related components of the refrigeration device, such as compressor frequency and expansion valve opening. Specifically, firstly, the first difference between the target temperature and the first temperature (reflecting the magnitude of the secondary cooling requirement) is calculated; secondly, the first control parameter of the refrigeration device is determined based on the first difference; thirdly, the second temperature, i.e., the temperature of the ambient air, is collected; finally, the first control parameter is fine-tuned based on the deviation between the second temperature and the target temperature to avoid overcooling or insufficient cooling and improve temperature control accuracy.

[0135] In some embodiments, the cooling capacity of primary and secondary cooling can be calculated using the enthalpy difference method.

[0136] Table 1 shows the parameters for each state point when the second temperature is 35℃, the target temperature is 10℃, the relative humidity of the external environment is 70%, and the target relative humidity is 90%.

[0137] Table 1

[0138]

[0139] The cooling capacity of the precooling device can be calculated using the enthalpy difference method:

[0140]

[0141] The cooling capacity of the refrigeration unit includes:

[0142]

[0143] Total cooling capacity:

[0144] In some embodiments, the control method may further include: acquiring a pressure value of the refrigeration device; and adjusting a first control parameter of the refrigeration device in response to the pressure value not meeting a pressure protection threshold, wherein the pressure protection threshold is preset.

[0145] In this embodiment, based on the compressor's safe operating parameters and the refrigeration system's design pressure, the high-pressure threshold and low-pressure threshold of the refrigeration device are preset. Then, the pressure values ​​of the refrigeration device are collected in real time by pressure sensors installed at the condenser outlet and evaporator inlet. If the pressure value does not meet the protection threshold, such as being higher than the high-pressure threshold or lower than the low-pressure threshold, the first control parameter is adjusted, such as reducing the compressor frequency or adjusting the expansion valve opening. If the adjustment still fails to meet the standard, the shutdown protection is triggered to prevent the refrigeration device from being damaged due to abnormal pressure and to ensure the safety of system operation.

[0146] S168, when the first temperature is lower than the target temperature, the heating device in the temperature control system is started, and the heating device is controlled to heat the gas delivered by the air supply system based on the target temperature, target air volume, first temperature and second temperature.

[0147] In this embodiment, a staged heating mode using waste heat from a high-pressure vortex fan and a heating device is adopted. The high-pressure vortex fan serves as the first-stage heat source, using its pressurization and temperature rise to heat the low-temperature fresh air from the outside. The heating device serves as the second-stage heat source, further heating the air to meet the standard supply air temperature, thus achieving staged heating.

[0148] In some embodiments, heating the gas supplied by the air supply system to the heating device may include: determining a first difference between a target temperature and a first temperature; determining a second control parameter of the heating device based on the first difference; acquiring a second temperature, wherein the second temperature is the temperature of the external environment after passing through the temperature control system; and adjusting the second control parameter of the heating device based on the second temperature.

[0149] In this embodiment, firstly, the first difference between the target temperature and the first temperature (reflecting the heating demand) is calculated; secondly, the second control parameters of the heating device are determined based on the first difference. Taking a PTC heater as an example, the second control parameters may include the output power of the PTC heater, the on / off time, etc.; thirdly, the second temperature is collected, and the second control parameters are finely adjusted based on the deviation between the second temperature and the target temperature to avoid excessive temperature fluctuations and reduce ineffective energy consumption.

[0150] Table 2 shows the parameters for each state point when the second temperature is -30℃, the target temperature is 60℃, and the relative humidity of the external environment is 90%.

[0151] Table 2

[0152]

[0153] The calculation shows that the high-pressure vortex blower provides the following heating capacity:

[0154]

[0155] The calculation of the heating capacity of the heating device includes:

[0156]

[0157] The total heating load is calculated as follows:

[0158]

[0159] It should be noted that 2200 in the above embodiment represents the target air volume, with the unit being m³ / h (cubic meters per hour), which is the air supply flow benchmark for the unit design. 3600 represents the time unit conversion factor, which converts hours (h) into seconds (s) to unify the unit dimension, so that the calculation result is finally presented in KW (kilowatt, 1KW=1KJ / s).

[0160] In this embodiment, a two-stage cooling method of pre-cooling + refrigeration is adopted in the cooling mode, which improves the cooling efficiency while reducing the operating load of the compressor. In the heating mode, the waste heat from the high-pressure vortex fan temperature rise is recovered, which improves the heating efficiency while reducing the power consumption of the PTC heater, reducing the unit's operating energy consumption, and improving flexibility. It can achieve wide-range temperature change control from -30℃ to 60℃, and can support the long-term uninterrupted continuous and stable operation of aircraft ground air conditioning based on the pre-cooling device.

[0161] Those skilled in the art will understand that various aspects of this disclosure can be implemented in the following forms: a completely hardware implementation, a completely software implementation (including firmware, microcode, etc.), or a combination of hardware and software implementations, which can be collectively referred to herein as a "circuit", "module" or "system".

[0162] Based on the same inventive concept, this disclosure also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method for aircraft ground air conditioning based on a pre-cooling device described above. Since the principle by which this computer-readable storage medium embodiment solves the problem is similar to that of the above-described method embodiment, the implementation of this computer-readable storage medium embodiment can refer to the implementation of the above-described method embodiment, and repeated details will not be elaborated further.

[0163] More specific examples of computer-readable storage media in this disclosure may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0164] In this disclosure, a computer-readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, carrying readable program code. Such propagated data signals may take various forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A readable signal medium may also be any readable medium other than a readable storage medium, capable of transmitting, propagating, or transmitting a program for use by or in connection with an instruction execution system, apparatus, or device.

[0165] Optionally, the program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to wireless, wired, optical fiber, RF, etc., or any suitable combination thereof.

[0166] In practical implementation, program code for performing the operations of this disclosure can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java and C++, and conventional procedural programming languages ​​such as C or similar languages. The program code can execute entirely on the user's computing device, partially on the user's device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server. In cases involving remote computing devices, the remote computing device can be connected to the user's computing device via any type of network, including a local area network (LAN) or a wide area network (WAN), or it can be connected to an external computing device (e.g., via the Internet using an Internet service provider).

[0167] Based on the same inventive concept, this disclosure also provides a computer program product, including a computer program or instructions, which, when executed by a processor, implement the control method for aircraft ground air conditioning based on a pre-cooling device in any of the above method embodiments. Since the principle by which this computer program product embodiment solves the problem is similar to that of the above method embodiments, the implementation of this computer program product embodiment can refer to the implementation of the above method embodiments, and repeated details will not be elaborated further.

[0168] It should be noted that although several modules or units for the device used to perform actions have been mentioned in the detailed description above, this division is not mandatory. In fact, according to embodiments of this disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. Conversely, the features and functions of one module or unit described above can be further divided and embodied by multiple modules or units.

[0169] Furthermore, although the steps of the method in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order, or that all the steps shown must be performed to achieve the desired result. Additional or alternative steps may be omitted, multiple steps may be combined into one step, and / or a step may be broken down into multiple steps.

[0170] From the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein can be implemented by software or by combining software with necessary hardware. Therefore, the technical solutions according to the embodiments of this disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (such as a CD-ROM, USB flash drive, external hard drive, etc.) or on a network, including several instructions to cause a computing device (such as a personal computer, server, mobile terminal, or network device, etc.) to execute the methods according to the embodiments of this disclosure.

[0171] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

Claims

1. An aircraft ground air conditioner based on a pre-cooling device, characterized in that, include: An air supply system and a temperature control system are provided. The temperature control system includes a precooling device and a refrigeration device. The precooling device is located between the air supply system and the refrigeration device. The precooling device includes a precooler and a first fan. The precooler is connected to the first fan. The first fan is an axial flow fan. The air supply system includes a second fan. The second fan is a high-pressure vortex fan. The air supply system is used to supply gas to the temperature control system; The precooling device is used to draw in ambient temperature air from outside using an axial flow fan. The ambient temperature air from outside and the fresh air that has been pressurized and heated by the high-pressure vortex fan exchange heat for the first time in the precooler. The heat of the pressurized fresh air is carried away and released into the environment using a natural cold source, thereby cooling the gas delivered by the air supply system. The refrigeration device is used to cool the gas a second time after the first cooling. It also includes a movable chassis and a housing mounted on the movable chassis; a first fan is disposed on the top of the housing, and the air outlet of the first fan is vertically upward; a water-blocking structure is provided on the top of the housing corresponding to the position of the air outlet of the first fan, and the water-blocking structure is connected to a drive mechanism; The drive mechanism is configured to control the water-blocking structure to open in response to the start of the first fan, and to control the water-blocking structure to close in response to the shutdown of the first fan; The refrigeration device includes an evaporator and a condenser. The precooler is located at one end of the housing. The condenser is located adjacent to both sides of the front end of the precooler. The evaporator is located inside a fan shroud. The fan shroud is mounted on the power unit of the aircraft ground air conditioner. The power unit is located at the other end of the housing opposite the precooler. A baffle plate is installed inside the air duct corresponding to the evaporator. The baffle plate is used to redistribute the airflow after it passes through the baffle plate, so that the airflow organization on the windward surface of the evaporator is relatively uniform.

2. The aircraft ground air conditioning system based on a pre-cooling device according to claim 1, characterized in that, The precooler includes at least one air inlet and at least one air outlet, with at least one air inlet connected to the air supply system and at least one air outlet connected to the refrigeration device.

3. The aircraft ground air conditioning system based on a pre-cooling device according to claim 2, characterized in that, A first temperature sensor is provided between the precooling device and the refrigeration device to obtain the first temperature of the gas between the precooling device and the refrigeration device.

4. The aircraft ground air conditioning system based on a pre-cooling device according to claim 1, characterized in that, It also includes a power source, a power system, a driving system, and a control system connected to the power system, driving system, air supply system, and temperature control system and used to control the operation of each system; wherein, the temperature control system further includes a heating device, which is used to heat the gas delivered by the air supply system; The enclosure includes a frame and a panel. The frame is fixed to a movable chassis, and the panel is detachably connected to the frame. The movable chassis includes a hollow structure, and the hollow structure and the enclosure together form a space for carrying the power source, the power system, the air supply system, the temperature control system, and the control system.

5. The aircraft ground air conditioning system based on a pre-cooling device according to claim 4, characterized in that, It also includes a fan shroud, inside which some components of the cooling device and the heating device are located; a second temperature sensor is provided at the outlet of the fan shroud, which is used to detect a second temperature of the external environment.

6. The aircraft ground air conditioning system based on a pre-cooling device according to claim 5, characterized in that, A fluid flow sensor is installed between the precooling device and the refrigeration device, and a wind pressure sensor is installed at the outlet of the hood.

7. The aircraft ground air conditioning system based on a pre-cooling device according to claim 1, characterized in that, The refrigeration device includes a compressor; the evaporator is connected to both the condenser and the compressor, the condenser and the compressor are connected, and the compressor is a variable frequency compressor so that the refrigeration temperature of the refrigeration device is adjustable.

8. The aircraft ground air conditioning system based on a pre-cooling device according to claim 1, characterized in that, The air supply system includes a first filter and a fan frequency converter. The first filter is connected to a second fan, and the fan frequency converter is connected to the second fan for controlling the second fan.

9. A control method for aircraft ground air conditioning based on a pre-cooling device, characterized in that, The method, applied to an aircraft ground air conditioning system based on a pre-cooling device as described in any one of claims 1-8, comprises: The target temperature, target air volume, first temperature, and second temperature are obtained, wherein the first temperature is the temperature of the gas between the precooling device and the refrigeration device, and the second temperature is the temperature of the external environment. Based on the target temperature and the target air volume, the air supply system is controlled to deliver gas to the temperature control system; When the first temperature is higher than the target temperature, the precooling device and the refrigeration device in the temperature control system are activated so that the precooling device cools the gas supplied by the air supply system once, and the refrigeration device is controlled to cool the gas a second time based on the target temperature, the target air volume, the first temperature and the second temperature.

10. The control method for aircraft ground air conditioning based on a pre-cooling device according to claim 9, characterized in that, The method further includes: When the first temperature is lower than the target temperature, the heating device in the temperature control system is activated, and the heating device is used to heat the gas supplied by the air supply system based on the target temperature, the target air volume, the first temperature, and the second temperature.

11. The control method for aircraft ground air conditioning based on a pre-cooling device according to claim 9, characterized in that, The method of controlling the refrigeration device to perform a secondary cooling of the gas after the first cooling based on the target temperature, the target air volume, the first temperature, and the second temperature includes: Determine a first difference between the target temperature and the first temperature; The first control parameter of the refrigeration device is determined based on the first difference; The first control parameter of the refrigeration device is adjusted according to the second temperature.

12. The control method for aircraft ground air conditioning based on a pre-cooling device according to claim 9, characterized in that, The method further includes: Obtain the pressure value of the refrigeration unit; In response to the pressure value not meeting the pressure protection threshold, the first control parameter of the refrigeration device is adjusted, wherein the pressure protection threshold is preset.

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