A heat pump type cooling and heating air conditioning unit for a logistics vehicle

Abstract

The utility model relates to heat pump type cold and warm air conditioning unit technical field discloses a heat pump type cold and warm air conditioning unit for logistics vehicle, including logistics vehicle body, cab and cargo compartment still include: engine compartment is set up in the cab bottom, frequency conversion compressor is installed in the engine compartment, is used for through mechanical compression effect drive refrigerant circulation flow in heat pump type cold and warm air conditioning unit system, intelligent reversing valve group is set up as the triangular valve group structure, in the utility model, through a set of integrated frequency conversion compressor, intelligent reversing valve group, composite heat exchange core, bidirectional heat exchange module and control module's heat pump type cold and warm air conditioning unit, has realized the temperature regulation of cab and cargo compartment. This design greatly simplifies the system structure, reduces the cost of equipment purchase, installation and maintenance. Solve the high cost brought by repeated configuration of air conditioning equipment in the prior art, effectively reduce the overall cost of the logistics vehicle, improve the economic benefit.

Description

Technical Field

[0001] This utility model relates to the technical field of heat pump air conditioning units, and in particular to a heat pump air conditioning unit for logistics vehicles. Background Technology

[0002] A heat pump air conditioning unit for logistics vehicles is a system specifically designed for logistics vehicles (such as trucks and refrigerated trucks). It utilizes heat pump technology to achieve both cooling and heating functions. The core of this system is the transfer of heat from the air through a circulation system, rather than traditional resistance heating or independent refrigeration units. In summer or when transporting goods that require low-temperature preservation (such as fresh produce and medicines), the unit absorbs heat from the vehicle compartment and discharges it outside, maintaining a stable low temperature inside the compartment and ensuring the quality of the goods. In winter, it can also "capture" heat from the outside air (even in low-temperature environments) without relying on energy-intensive resistance heating, transferring it to the compartment for heating. It can also heat the driver's cab, improving driver comfort.

[0003] In existing technologies, heat pump-type air conditioning units for logistics vehicles cannot simultaneously cool and heat. When a logistics vehicle is traveling in a low-temperature environment, the cab needs to maintain a certain temperature to prevent the driver from being in a cold environment. However, since the heat pump-type air conditioning unit in the cargo compartment is already cooling, heating the cab requires a separate, independent air conditioning system on the logistics vehicle. Having two independent air conditioning systems in a logistics vehicle is too costly, and requiring the driver to independently control both systems is cumbersome, easily distracts the driver, and poses certain safety hazards.

[0004] Therefore, this application provides a heat pump type air conditioning unit for logistics vehicles to meet the requirements. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a heat pump type air conditioning unit for logistics vehicles to solve the problem that existing heat pump type air conditioning units for logistics vehicles cannot simultaneously perform cooling and heating.

[0006] To address the aforementioned problems, this utility model is implemented through the following technical solution.

[0007] A heat pump type air conditioning unit for logistics vehicles includes a vehicle body, a driver's cab, and a cargo box, and further includes: The engine compartment is located at the bottom of the cab; The variable frequency compressor is installed in the engine compartment and is used to drive the refrigerant to circulate in the heat pump air conditioning unit system through mechanical compression. The intelligent reversing valve assembly is configured as a triangular valve assembly structure to realize the switching of cooling / heating modes and the distribution of refrigerant flow in the heat pump air conditioning unit system. The composite heat exchange core is configured as a microchannel aluminum flat tube structure and is fixed to the side of the cab near the cargo box to realize refrigerant heat exchange and dual-zone energy distribution. A bidirectional heat exchange module is suspended and fixed between the cab and the cargo box to realize the delivery of hot and cold air by the heat pump air conditioning unit system, as well as independent temperature control of the cab and the cargo box; The control module is integrated into the instrument panel included in the cab and is connected to the variable frequency compressor, the intelligent reversing valve group, and the bidirectional heat exchange module to regulate their respective working states.

[0008] Preferably, The variable frequency compressor includes an input end and an output end; The intelligent reversing valve assembly includes a low-pressure return port, a high-pressure inlet port, an outer liquid supply port, an outer return port, an inner liquid supply port, and a low-pressure side inlet. The composite heat exchange core includes an outer refrigerant inlet, an outer refrigerant outlet, an inner refrigerant inlet, and an inner refrigerant outlet; The bidirectional heat exchange module includes a refrigerant input end, a refrigerant output end, and an airflow input end; The airflow input end includes an airflow input port in the cab and an airflow input port in the cargo box.

[0009] Preferably, it further includes: The refrigerant return pipe is fixedly connected at one end to the input end of the variable frequency compressor and at the other end to the low-pressure return port of the intelligent reversing valve group. The high-pressure exhaust pipe is fixedly connected at one end to the output end of the variable frequency compressor and at the other end to the high-pressure air inlet of the intelligent reversing valve group.

[0010] Preferably, it further includes: The first refrigerant inlet pipe is fixedly connected at one end to the outer refrigerant inlet of the composite heat exchange core and at the other end to the outer liquid supply port of the intelligent reversing valve group. The first refrigerant outlet pipe is fixedly connected at one end to the outer refrigerant outlet of the composite heat exchange core and at the other end to the outer return port of the intelligent reversing valve group. The second refrigerant inlet pipe is fixedly connected at one end to the refrigerant inlet inside the composite heat exchange core and at the other end to the liquid supply port inside the intelligent reversing valve group. The second refrigerant outlet pipe is fixedly connected at one end to the refrigerant outlet on the inner side of the composite heat exchange core.

[0011] Preferably, it further includes: The cab air duct interface pipe is fixedly connected at one end to the cab airflow inlet and at the other end to the cab air conditioning outlet pipe. The air duct interface of the cargo compartment is fixedly connected at one end to the airflow inlet of the cargo compartment and at the other end to the air supply duct on the top of the cargo compartment. A liquid refrigerant pipe, one end of which is fixedly connected to the refrigerant input end of the bidirectional heat exchange module, and the other end of which is fixedly connected and connected to the second refrigerant outlet pipe; A gaseous refrigerant pipe is fixedly connected at one end to the refrigerant output end of the bidirectional heat exchange module and at the other end to the low-pressure side inlet of the intelligent reversing valve group.

[0012] Preferably, it further includes: The thermoelectric generator is attached to the inside of the side wall of the composite heat exchange core by thermally conductive silicone. It is used to convert the temperature difference between the inside and outside of the composite heat exchange core into electrical energy to supplement the system power supply.

[0013] Preferably, the intelligent reversing valve group includes three electromagnetic reversing valves, which are respectively used to control the passage status of the high-pressure inlet and the first refrigerant inlet pipe, the high-pressure inlet and the second refrigerant inlet, and the low-pressure return port and the first refrigerant outlet pipe. All three electromagnetic reversing valves are connected to the control module.

[0014] Preferably, the logistics vehicle is equipped with an ABS anti-lock braking system, and the control module is connected to the ABS anti-lock braking system.

[0015] This utility model provides a heat pump type air conditioning unit for logistics vehicles. Compared with the prior art, it has the following advantages: 1. A heat pump-type air conditioning unit integrating a variable frequency compressor, intelligent reversing valve assembly, composite heat exchange core, bidirectional heat exchange module, and control module enables temperature regulation of the cab and cargo compartment. This design greatly simplifies the system structure and reduces the costs of equipment procurement, installation, and maintenance. It solves the problem of high costs associated with redundant air conditioning equipment in existing technologies, effectively reducing the overall cost of logistics vehicles and improving economic efficiency.

[0016] 2. Utilizing the coordinated operation of components such as the intelligent reversing valve assembly, composite heat exchange core, and bidirectional heat exchange module, this air conditioning unit can precisely switch between cooling and heating modes and independently control the temperature of the cab and cargo compartment. In cooling mode, the high-temperature, high-pressure refrigerant is guided through the intelligent reversing valve assembly to the outside of the composite heat exchange core, where it exchanges heat with the outside air and then flows to the bidirectional heat exchange module to absorb heat from the air in the cab and cargo compartment, achieving cooling. In heating mode, the refrigerant flows to the inside of the composite heat exchange core, releases heat, and then heats the air through the bidirectional heat exchange module before being delivered to the cab and cargo compartment respectively. This solves the problem of difficulty in achieving independent and precise temperature control in dual zones due to the complexity of existing technologies, meeting the diverse needs of logistics vehicles for cab comfort and suitable cargo storage temperatures in different transportation scenarios. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the present invention after installation.

[0018] Figure 2 This utility model Figure 1 Enlarged structural diagram at point A in the middle.

[0019] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0020] Figure 4 This is a schematic diagram of the connection structure of the variable frequency compressor, intelligent reversing valve group, and bidirectional heat exchange module of this utility model.

[0021] Figure 5 This is a schematic diagram of the connection structure between the intelligent reversing valve assembly and the composite heat exchange core of this utility model.

[0022] Figure 6 This is a schematic diagram of the overall structure of the bidirectional heat exchange module of this utility model.

[0023] Figure 7 This is a schematic diagram of the connection structure between the composite heat exchange core and the thermoelectric generator of this utility model.

[0024] The attached figures are labeled as follows: 10. Vehicle body; 11. Cab; 12. Cargo box; 20. Variable frequency compressor; 21. Refrigerant return pipe; 22. High-pressure exhaust pipe; 30. Intelligent reversing valve assembly; 40. Composite heat exchange core; 41. First refrigerant inlet pipe; 42. First refrigerant outlet pipe; 43. Second refrigerant inlet pipe; 44. Second refrigerant outlet pipe; 50. Bidirectional heat exchange module; 51. Cab air duct interface pipe; 52. Cargo box air duct interface; 53. Liquid refrigerant pipe; 54. Gaseous refrigerant pipe; 60. Thermoelectric generator. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of protection of the present invention.

[0026] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0027] Reference Figures 1-7 A heat pump-type air conditioning unit for logistics vehicles includes a vehicle body 10, a cab 11, and a cargo box 12. The vehicle body 10 can be a Jiangling Lexing E-Road Express Logistics Edition 4.5T 4.2-meter single-row pure electric van-type light truck, including versions with capacities of 77.28kWh, 100.46kWh, and 86.55kWh. Its cab 11 is single-row and can accommodate 2-3 people, with a 4.2-meter long cargo box; the specific volume varies depending on the version. Alternatively, it can be a Foton Aumark S3 series high-efficiency express delivery version, with the cab 11 primarily single-row or extended cab, and the cargo box length ranging from 3.8 meters to 5.6 meters, available in various forms such as flatbed and van types. For example, the BJ5048XXY-F3 model has a 4.14-meter cargo box, and the BJ5128XXYGJFD-AC1 model has a 5.6-meter cargo box. It also includes: The engine compartment is located at the bottom of the cab 11; the Jiangling Lexing E-Road Express Logistics Edition 4.5T 4.2m single-row pure electric van light truck is a pure electric vehicle and does not have a traditional engine compartment. It disperses the power components such as the drive motor and battery: the drive motor is generally located at the rear, near the rear axle, directly providing power to the vehicle; the battery is located in the middle of the frame.

[0028] The variable frequency compressor 20, installed in the engine compartment, drives the refrigerant to circulate within the heat pump air conditioning unit system through mechanical compression. The variable frequency compressor 20 can be a DC inverter compressor 20, which, compared to AC inverter compressors, can more precisely adjust the speed and quickly respond to control module commands, achieving precise control of refrigerant flow and pressure. During the operation of the logistics vehicle, the operating conditions are complex and variable. The DC inverter compressor can flexibly adjust its cooling or heating capacity according to the real-time temperature requirements of the cab 11 and cargo compartment 12, precisely controlling the temperature while improving energy efficiency and avoiding energy waste and component wear caused by frequent start-stop cycles. Specifically, options include Johnson Controls Hitachi Wanbao's automotive low-temperature heat pump variable frequency scroll compressor and GMCC's AZN92D20UZA_R410A compressor.

[0029] The intelligent reversing valve assembly 30, configured as a triangular valve assembly, is used to switch between cooling and heating modes and distribute refrigerant flow in the heat pump air conditioning unit system. The intelligent reversing valve assembly 30 can be selected from Rexroth's 4WE6D6X / EG24N9K4, whose flow capacity meets the refrigerant flow requirements of the logistics vehicle's air conditioning system. Its valve core is sensitive and switches quickly, accurately controlling the refrigerant flow direction and adapting to complex operating conditions. This valve has a wide operating pressure range, can operate stably within the operating pressure range of the logistics vehicle's air conditioning system, and possesses high reliability and anti-contamination capabilities, reducing maintenance frequency. Alternatively, Yuken's DSG-03-3C2-D24-N1-50 can be selected, which is a three-position four-way valve that can achieve multiple refrigerant flow direction controls, meeting the requirements for switching between cooling and heating modes. It uses a 24V DC power supply, has good compatibility with the logistics vehicle's electrical system, can accurately control the valve core's movement, and has low internal leakage, reducing refrigerant leakage loss and improving system efficiency.

[0030] The composite heat exchange core 40, configured as a microchannel aluminum flat tube structure, is fixed to the side of the cab 11 near the cargo box 12, used for refrigerant heat exchange and dual-zone energy distribution. The composite heat exchange core 40 can be a microchannel aluminum flat tube heat exchanger. This type of heat exchange core uses a microchannel structure, with internal microchannel aluminum flat tubes having a large heat exchange area, enabling efficient heat exchange between the refrigerant and the outside air or the air inside the vehicle. Simultaneously, aluminum is lightweight, meeting the lightweight requirements of logistics vehicles, and has good corrosion resistance, adapting to the complex operating environment of logistics vehicles and ensuring long-term stable operation. Composite heat exchange cores 40 from brands such as Valeo and Behr can be selected.

[0031] The bidirectional heat exchange module 50, suspended and fixed between the cab 11 and the cargo box 12, is used to deliver hot and cold air to the heat pump-type air conditioning system and to independently control the temperature of the cab 11 and the cargo box 12. A parallel-flow bidirectional heat exchange module 50 with independent temperature control via dual air ducts is a suitable choice. This type of module uses a parallel flow channel design internally, allowing for sufficient heat exchange between the refrigerant and air, improving heat exchange efficiency. The dual-air duct design allows for independent processing of the air in the cab 11 and the cargo box 12, precisely controlling the temperature of the two areas to meet the temperature control needs of different areas of the logistics vehicle. Suitable brands include Shanghai Jialeng Songzhi and Valeo.

[0032] The control module, integrated into the instrument panel within the cab 11, connects to the variable frequency compressor 20, intelligent reversing valve group 30, and bidirectional heat exchange module 50, regulating their respective operating states. The control module can be an intelligent control module based on a microcontroller (MCU). These modules possess powerful data processing capabilities and abundant interface resources, enabling them to quickly process data from temperature and pressure sensors, and precisely control the speed of the variable frequency compressor 20, the reversing action of the intelligent reversing valve group 30, and the operating state of the bidirectional heat exchange module 50 according to preset programs, meeting the system's intelligent control requirements. For example, Renesas Electronics' R7F7015343AFP-C series MCUs are designed specifically for automotive applications, featuring high performance and high reliability. They integrate multiple functional modules, such as timers, analog-to-digital converters, and communication interfaces. Abundant timer resources can be used to precisely control the speed regulation pulse signal of the variable frequency compressor 20; multi-channel ADCs can quickly acquire temperature sensor data from the cab 11 and cargo box 12; CAN and LIN bus interfaces facilitate stable communication with intelligent reversing valve group 30, bidirectional heat exchange module, etc., to achieve collaborative work of various components and ensure stable system operation.

[0033] The variable frequency compressor 20 includes an input end and an output end. The input end is the channel for drawing in refrigerant. The low-temperature, low-pressure refrigerant at the end of the cycle comes from the bidirectional heat exchange module 50 during cooling and from the inside of the composite heat exchange core 40 during heating. It needs to enter the variable frequency compressor 20 through this interface to provide "raw materials" for the compression process. The output end is the channel for the variable frequency compressor 20 to discharge high-pressure refrigerant. The high-temperature, high-pressure refrigerant gas after mechanical compression is delivered to the intelligent reversing valve group 30 through this interface to provide a "power source" for the entire heat pump cycle. The high pressure drives the refrigerant to flow in the pipeline.

[0034] The intelligent reversing valve assembly 30 includes a low-pressure return port, a high-pressure inlet port, an outer liquid supply port, an outer return port, an inner liquid supply port, and a low-pressure side inlet. The high-pressure inlet port receives high-temperature, high-pressure refrigerant gas delivered from the output of the variable frequency compressor 20. The low-pressure return port returns the low-temperature, low-pressure refrigerant at the end of the cycle to the input of the variable frequency compressor 20. When the outer liquid supply port delivers high-pressure refrigerant to the "outer side" of the composite heat exchange core 40 for cooling, the outer return port receives the refrigerant after heat exchange on the "outer side" of the composite heat exchange core 40, which is a high-pressure liquid during cooling. When the inner liquid supply port delivers high-pressure refrigerant to the "inner side" of the composite heat exchange core 40 for heating, the low-pressure side inlet receives the low-temperature, low-pressure refrigerant from the output of the bidirectional heat exchange module 50, which is gaseous during cooling and liquid during heating.

[0035] The composite heat exchange core 40 includes an outer refrigerant inlet, an outer refrigerant outlet, an inner refrigerant inlet, and an inner refrigerant outlet; the outer refrigerant inlet / outlet: corresponding to the outer heat exchange area of ​​the composite heat exchange core 40 facing outwards from the vehicle, is the core heat exchange channel in the cooling mode. During cooling, the high-pressure refrigerant from the outer liquid supply port of the intelligent reversing valve assembly 30 enters the outer side of the composite heat exchange core 40 through the outer refrigerant inlet. After exchanging heat with the outside air and condensing, it flows out from the outer refrigerant outlet and is returned through the outer return port of the intelligent reversing valve assembly 30. The design of the outer interface directly matches the "heat dissipation" function of the composite heat exchange core 40, ensuring efficient heat dissipation during cooling. The inner refrigerant inlet / outlet corresponds to the inner heat exchange area of ​​the composite heat exchange core 40 facing the inside of the vehicle and is the core heat exchange channel in the heating mode. During heating, the high-pressure refrigerant from the inner liquid supply port of the intelligent reversing valve assembly 30 enters the inner side of the composite heat exchange core 40 through the inner refrigerant inlet. After releasing heat, it provides a heat source for the bidirectional heat exchange module 50 and flows out from the inner refrigerant outlet, which is then guided to the bidirectional heat exchange module 50 through the second refrigerant outlet. The design of the inner interface directly matches the "heat release" function of the composite heat exchange core 40, ensuring efficient heat transfer to the vehicle interior during heating.

[0036] The bidirectional heat exchange module 50 includes a refrigerant input end, a refrigerant output end, and an airflow input end. The refrigerant input end is the channel through which the bidirectional heat exchange module 50 obtains "cold / hot energy". It needs to be connected to the inner outlet of the composite heat exchange core 40 through the liquid refrigerant pipe 53. It receives the refrigerant after it has been processed by the composite heat exchange core 40. When cooling, it is a low-temperature liquid, and when heating, it is a high-temperature liquid, providing an energy source for subsequent air heat exchange. Refrigerant output end: This is the channel for the bidirectional heat exchange module 50 to "discharge the refrigerant after heat exchange". When the refrigerant exchanges heat with the air in the bidirectional heat exchange module 50, it absorbs heat and becomes gaseous during cooling and releases heat and becomes liquid during heating. It is then fed back to the intelligent reversing valve group 30 through this interface via the gaseous refrigerant pipe 54 to complete the cycle. Airflow input end: This is the channel through which the bidirectional heat exchange module 50 "draws in air". It needs to draw in air from the cab 11 and the cargo box 12 respectively, exchange heat with the refrigerant, and then send the cold / hot air back to the corresponding area through the air duct interface, directly matching the independent temperature control requirements of the two areas.

[0037] The airflow input includes an airflow inlet for the cab and an airflow inlet for the cargo box. The cab airflow inlet specifically draws in air from the cab area 11, exchanges heat with the refrigerant, and then returns it to the cab 11 through the cab air duct interface pipe 51, enabling independent temperature control of the cab 11. The cargo box airflow inlet specifically draws in air from the cargo box area 12, exchanges heat with the refrigerant, and then returns it to the cargo box 12 through the cargo box air duct interface 52, enabling independent temperature control of the cargo box 12.

[0038] Also includes: The refrigerant return pipe 21 is fixedly connected at one end to the input end of the variable frequency compressor 20 and at the other end to the low-pressure return port of the intelligent reversing valve group 30. In the cooling / heating mode, the high-temperature and high-pressure gas output by the variable frequency compressor 20 is directed into the high-pressure inlet of the intelligent reversing valve group 30 through the high-pressure exhaust pipe 22. The high-pressure exhaust pipe 22 is fixedly connected at one end to the output end of the variable frequency compressor 20 and at the other end to the high-pressure inlet of the intelligent reversing valve group 30. The low-temperature, low-pressure refrigerant at the end of the cycle (from the bidirectional heat exchange module 50 during cooling and from the inside of the composite heat exchange core 40 during heating) is returned to the input end of the variable frequency compressor 20 from the low-pressure return port of the intelligent reversing valve group 30 through the refrigerant return pipe 21.

[0039] Based on the pressure difference drive principle: the variable frequency compressor 20 compresses to generate high pressure, which pushes the refrigerant along the high pressure exhaust pipe 22 to the intelligent reversing valve group 30; at the end of the cycle, the refrigerant is at low pressure, and under the action of pressure difference, it "returns" to the variable frequency compressor 20 along the return pipe, forming a closed loop cycle.

[0040] Also includes: The first refrigerant inlet pipe 41 is fixedly connected at one end to the refrigerant inlet on the outside of the composite heat exchange core 40, and at the other end to the liquid supply port on the outside of the intelligent reversing valve group 30. The first refrigerant outlet pipe 42 is fixedly connected at one end to the refrigerant outlet on the outside of the composite heat exchange core 40, and at the other end to the return port on the outside of the intelligent reversing valve group 30. During cooling, the refrigerant flows out from the high-pressure inlet of the intelligent reversing valve assembly 30 and enters the outer side of the composite heat exchange core 40. On the outer side, the high-temperature, high-pressure gaseous refrigerant exchanges heat with the outside air, releasing its own heat and condensing into a high-pressure liquid. This step releases the heat carried by the refrigerant into the external environment, lowering the refrigerant's temperature. Subsequently, the refrigerant flows through relevant interfaces and pipelines to the bidirectional heat exchange module 50. Inside the bidirectional heat exchange module 50, the liquid refrigerant evaporates and absorbs heat, absorbing heat from the air in the cab 11 and cargo compartment 12, thus lowering the air temperature. The cooled air is then returned to the cab 11 and cargo compartment 12 respectively, thereby achieving cooling of these two areas and creating a low-temperature environment for the occupants and cargo. The second refrigerant inlet pipe 43 is fixedly connected at one end to the refrigerant inlet inside the composite heat exchange core 40, and at the other end to the liquid supply port inside the intelligent reversing valve group 30. The second refrigerant outlet pipe 44 is fixedly connected at one end to the refrigerant outlet inside the composite heat exchange core 40.

[0041] During heating, refrigerant flows into the inner side of the composite heat exchange core 40 from the high-pressure inlet of the intelligent reversing valve assembly 30, where it releases heat and condenses into a high-pressure liquid. The heat released by the refrigerant is used to heat the air, and the heated air is then delivered to the cab 11. If the cargo compartment also requires heating, hot air is similarly supplied to the cargo compartment, raising the temperature inside both the cab 11 and the cargo compartment 12 to meet the warm environment requirements of personnel and cargo. Also includes: The cab air duct interface pipe 51 is fixedly connected at one end to the cab airflow inlet and at the other end to the cab air conditioning outlet pipe 11. The air duct interface 52 of the cargo compartment is fixedly connected at one end to the airflow inlet of the cargo compartment and at the other end to the air supply duct on the top of the cargo compartment 12. The liquid refrigerant pipe 53 is fixedly connected at one end to the refrigerant input end of the bidirectional heat exchange module 50, and at the other end is fixedly connected and connected to the second refrigerant outlet pipe 44. The gaseous refrigerant pipe 54 is fixedly connected at one end to the refrigerant output end of the bidirectional heat exchange module 50, and at the other end to the low-pressure side inlet of the intelligent reversing valve group 30.

[0042] The refrigerant treated by the composite heat exchange core 40 is at a low temperature when cooling and at a high temperature when heating. It enters the bidirectional heat exchange module 50 through the liquid refrigerant pipe 53. The refrigerant in the bidirectional heat exchange module 50 exchanges heat with the air, absorbing heat for cooling and releasing heat for heating. The generated cold / hot air is sent to the corresponding areas through the cab air duct and the carriage air duct, respectively.

[0043] Also includes: Thermoelectric generator 60 is attached to the inside of the side wall of composite heat exchange core 40 via thermally conductive silicone. It utilizes the temperature difference between the inner and outer sides of the composite heat exchange core 40 to convert it into electrical energy, supplementing the system's power supply. When the composite heat exchange core 40 is working, the side wall generates a temperature difference due to the temperature difference between the outer side (hotter outside) and the inner side (colder inside) – for example, the outer side is hotter and the inner side is colder during cooling, and the outer side is colder and the inner side is hotter during heating. After the thermoelectric generator 60 is attached to the side wall, it generates electrical energy using this temperature difference. This electrical energy can then be used to supplement the power supply to the control module or other low-voltage components.

[0044] The intelligent reversing valve assembly 30 includes three solenoid reversing valves. These three valves control the flow of the high-pressure inlet to the first refrigerant inlet pipe 41, the high-pressure inlet to the second refrigerant inlet, and the low-pressure return port to the first refrigerant outlet pipe 42, respectively. All three valves are connected to the control module. The intelligent reversing valve assembly 30 operates in two modes: In cooling mode, the control module commands the "high-pressure inlet - first refrigerant inlet" valve to open and the "high-pressure inlet - second refrigerant inlet" valve to close, thus allowing the refrigerant to flow to the outside of the composite heat exchange core 40. At the same time, the "low-pressure return port - first refrigerant outlet" valve opens, allowing the refrigerant on the outside of the composite heat exchange core 40 to return to the intelligent reversing valve group 30. In heating mode, the control module commands the "high-pressure inlet - second refrigerant inlet" valve to open and the "high-pressure inlet - first refrigerant inlet" valve to close, thus directing the refrigerant to flow into the inner side of the composite heat exchange core 40; the "low-pressure return port - first refrigerant outlet" valve to close, thus adapting to the inner refrigerant circuit.

[0045] The logistics vehicle body 10 is equipped with an ABS anti-lock braking system, and the control module is connected to the ABS anti-lock braking system. This prevents the air conditioning system from operating under "high load" conditions such as braking and slippage, which could affect driving safety and ensures the compatibility of air conditioning operation with vehicle safety.

[0046] Working process and principle: After the system starts, the variable frequency compressor 20, which is the core of the power, runs first. Through mechanical compression, it draws in the low-temperature and low-pressure gaseous refrigerant at the end of the circulation through the low-pressure return port of the intelligent reversing valve group 30 and compresses it into a high-temperature and high-pressure gaseous refrigerant. Subsequently, the high-temperature and high-pressure gaseous refrigerant is delivered to the intelligent reversing valve group 30 through the high-pressure exhaust pipe 22. The control module is integrated in the instrument panel of the cab 11. According to the cooling or heating demand, it adjusts the on and off state of the three electromagnetic reversing valves in the intelligent reversing valve group 30 to realize the switching of refrigerant flow direction.

[0047] In cooling mode, the intelligent reversing valve assembly 30 directs the refrigerant to the first refrigerant inlet pipe 41, allowing it to enter the outer region of the composite heat exchange core 40 through the outer refrigerant inlet. The composite heat exchange core 40 utilizes a microchannel aluminum flat tube structure to increase the heat exchange area. The high-temperature, high-pressure gaseous refrigerant exchanges heat with the outside air, releasing heat and condensing into high-pressure liquid refrigerant. This liquid refrigerant then flows back to the intelligent reversing valve assembly 30 via the outer refrigerant outlet of the composite heat exchange core 40 and the first refrigerant outlet pipe 42, and is subsequently delivered to the bidirectional heat exchange module 50 via the liquid refrigerant pipe 53. At the input end, within the bidirectional heat exchange module 50, high-pressure liquid refrigerant evaporates and absorbs heat, absorbing the heat from the air entering through the cab airflow inlet and the cargo compartment airflow inlet, thus cooling the air. The cooled air is then sent into the cab 11 and cargo compartment 12 via the cab air duct interface pipe 51 and the cargo compartment air duct interface 52, respectively, to complete the refrigeration. The refrigerant, after absorbing heat, flows out from the refrigerant output end of the bidirectional heat exchange module 50, returns to the low-pressure side inlet of the intelligent reversing valve group 30 via the gaseous refrigerant pipe 54, and finally flows back to the input end of the variable frequency compressor 20 via the refrigerant return pipe 21, forming a refrigeration cycle.

[0048] In heating mode, the intelligent reversing valve assembly 30 switches the refrigerant flow direction, introducing the high-temperature, high-pressure gaseous refrigerant into the inner refrigerant inlet of the composite heat exchange core 40 through the second refrigerant inlet pipe 43. The refrigerant releases heat in the inner region of the composite heat exchange core 40, condenses into high-pressure liquid refrigerant, and is then sent to the bidirectional heat exchange module 50 through the inner refrigerant outlet of the composite heat exchange core 40, the second refrigerant outlet pipe 44, and the liquid refrigerant pipe 53. The refrigerant in the bidirectional heat exchange module 50 condenses and releases heat, heating the incoming air. The hot air is sent into the cab 11 and cargo box 12 through the corresponding air ducts to complete the heating. After releasing heat, the liquefied refrigerant flows back to the variable frequency compressor 20 through the gaseous refrigerant pipe 54, the intelligent reversing valve assembly 30, and the refrigerant return pipe 21, forming a heating cycle.

[0049] Meanwhile, the thermoelectric generator 60, which is attached to the inside of the side wall of the composite heat exchange core 40, uses the temperature difference between the inside and outside of the composite heat exchange core 40 to convert the temperature difference into electrical energy based on the Seebeck effect, supplementing the system power supply; the control module is also connected to the ABS anti-lock braking system of the logistics vehicle body 10, and adjusts the air conditioning operation strategy according to the vehicle driving status to ensure driving safety and system stability.

[0050] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A heat pump type air conditioning unit for logistics vehicles, comprising a vehicle body (10), a driver's cab (11), and a cargo box (12), characterized in that, Also includes: The engine compartment is located at the bottom of the cab (11); A variable frequency compressor (20) is installed in the engine compartment and is used to drive the refrigerant to circulate in the heat pump air conditioning unit system through mechanical compression. The intelligent reversing valve group (30) is configured as a triangular valve group structure to realize the switching of cooling / heating mode and the distribution of refrigerant flow in the heat pump air conditioning unit system; The composite heat exchange core (40) is configured as a microchannel aluminum flat tube structure and is fixed to the side of the cab (11) near the cargo box (12) to realize refrigerant heat exchange and dual-zone energy distribution; The bidirectional heat exchange module (50) is suspended and fixed between the cab (11) and the cargo box (12) to realize the delivery of hot and cold air of the heat pump air conditioning unit system, and to independently control the temperature of the cab (11) and the cargo box (12); The control module is integrated into the instrument panel included in the cab (11) and is connected to the variable frequency compressor (20), the intelligent reversing valve group (30), and the bidirectional heat exchange module (50) to regulate their respective working states.

2. The heat pump type air conditioning unit for logistics vehicles according to claim 1, characterized in that: The variable frequency compressor (20) includes an input end and an output end; The intelligent reversing valve group (30) includes a low-pressure return port, a high-pressure inlet port, an outer liquid supply port, an outer return port, an inner liquid supply port, and a low-pressure side inlet. The composite heat exchange core (40) includes an outer refrigerant inlet, an outer refrigerant outlet, an inner refrigerant inlet, and an inner refrigerant outlet; The bidirectional heat exchange module (50) includes a refrigerant input end, a refrigerant output end, and an airflow input end; The airflow input end includes an airflow input port in the cab and an airflow input port in the cargo box.

3. A heat pump type air conditioning unit for logistics vehicles according to claim 2, characterized in that, Also includes: The refrigerant return pipe (21) is fixedly connected at one end to the input end of the variable frequency compressor (20) and at the other end to the low-pressure return port of the intelligent reversing valve group (30). The high-pressure exhaust pipe (22) is fixedly connected at one end to the output end of the variable frequency compressor (20) and at the other end to the high-pressure air inlet of the intelligent reversing valve group (30).

4. A heat pump type air conditioning unit for logistics vehicles according to claim 2, characterized in that, Also includes: The first refrigerant inlet pipe (41) is fixedly connected at one end to the outer refrigerant inlet of the composite heat exchange core (40) and at the other end to the outer liquid supply port of the intelligent reversing valve group (30). The first refrigerant outlet pipe (42) is fixedly connected at one end to the outer refrigerant outlet of the composite heat exchange core (40) and at the other end to the outer return port of the intelligent reversing valve group (30). The second refrigerant inlet pipe (43) is fixedly connected at one end to the refrigerant inlet inside the composite heat exchange core (40) and at the other end to the liquid supply port inside the intelligent reversing valve group (30). The second refrigerant outlet pipe (44) is fixedly connected at one end to the refrigerant outlet on the inner side of the composite heat exchange core (40).

5. A heat pump type air conditioning unit for logistics vehicles according to claim 4, characterized in that, Also includes: The cab air duct interface pipe (51) is fixedly connected at one end to the cab airflow inlet and at the other end to the cab (11) air conditioning outlet pipe. The air duct interface (52) of the cargo compartment is fixedly connected at one end to the airflow inlet of the cargo compartment and at the other end to the air supply duct at the top of the cargo compartment (12); The liquid refrigerant pipe (53) is fixedly connected at one end to the refrigerant input end of the bidirectional heat exchange module (50) and at the other end to the second refrigerant outlet pipe (44); The gaseous refrigerant pipe (54) is fixedly connected at one end to the refrigerant output end of the bidirectional heat exchange module (50) and at the other end to the low-pressure side inlet of the intelligent reversing valve group (30).

6. A heat pump type air conditioning unit for logistics vehicles according to claim 1, characterized in that, Also includes: The thermoelectric generator (60) is attached to the inside of the side wall of the composite heat exchange core (40) by thermally conductive silicone. It is used to convert the temperature difference between the inside and outside of the composite heat exchange core (40) into electrical energy to supplement the power supply of the system.

7. A heat pump type air conditioning unit for logistics vehicles according to claim 4, characterized in that, The intelligent reversing valve group (30) includes three electromagnetic reversing valves. The three electromagnetic reversing valves are used to control the passage status of the high-pressure inlet and the first refrigerant inlet pipe (41), the high-pressure inlet and the second refrigerant inlet, and the low-pressure return port and the first refrigerant outlet pipe (42). All three electromagnetic reversing valves are connected to the control module.

8. A heat pump type air conditioning unit for logistics vehicles according to claim 1, characterized in that, The logistics vehicle body (10) is equipped with an ABS anti-lock braking system, and the control module is connected to the ABS anti-lock braking system.

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