Air conditioning system for vehicle

Abstract

The vehicle air conditioning system comprises a refrigerant flow path, a compressor lubricating oil loop and a power unit, the refrigerant flow path comprises a condenser, a dryer and an air conditioner body which are connected in sequence, and the input end of a first three-way valve is connected with the output end of the air conditioner body; a mechanical compressor is connected between the first output end of the first three-way valve and the first input end of the second three-way valve, an electric compressor is connected between the second output end of the first three-way valve and the second input end of the second three-way valve, and the output end of the second three-way valve is connected with the input end of the oil-gas separator. The first output end of the oil-gas separator is connected with the input end of the first three-way valve, and the second output end of the oil-gas separator is connected with the input end of the condenser; the power unit is connected with the mechanical compressor and the electric compressor and used for providing power sources for the mechanical compressor and the electric compressor. The problem that in the prior art, when a double-compressor air-conditioning system operates, lubricating oil of the compressors is prone to loss is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle air conditioning, and in particular to a vehicle air conditioning system. Background Art

[0002] For traditional fuel vehicles, a mechanical compressor is usually used to drive the air-conditioning system, which cannot be used when parked. In order to solve the problem of using air conditioning when parking, an electric air-conditioning is usually installed, which is independent of the original mechanical compressor air-conditioning system. The mechanical compressor air-conditioning is used when driving, and the battery is used to provide power to drive the electric air-conditioning when parking; for new energy vehicles, an air-conditioning system driven by an electric compressor is used, and energy is provided to the air-conditioning system by power batteries and inverters, thus solving the problem of using the air-conditioning system while driving and parking. In the prior art, a mechanical compressor and an electric compressor are installed in a vehicle system at the same time. The power unit provides power sources for the mechanical compressor and the electric compressor respectively, which can ensure that the vehicle system can use the air-conditioning system when driving and parking. However, when the air-conditioning system is running, the compressor lubricating oil is easy to flow into the condenser and the air-conditioning body, resulting in a reduction in the lubricating oil flowing back into the mechanical compressor or the electric compressor, which can easily cause damage to the mechanical compressor and the electric compressor. Summary of the invention

[0003] The purpose of the present invention is to overcome the above technical deficiencies and provide a vehicle air conditioning system to solve the problem of easy loss of compressor lubricating oil when the dual compressor air conditioning system is running in the prior art.

[0004] In order to achieve the above technical objectives, the present invention adopts the following technical solutions: The present invention provides a vehicle air-conditioning system, comprising a refrigerant flow path, a compressor lubricating oil circuit and a power unit, wherein the refrigerant flow path comprises a condenser, a dryer and an air-conditioning body connected in sequence, the compressor lubricating oil circuit comprises a first three-way valve, a second three-way valve and an oil-gas separator, the input end of the first three-way valve is connected to the output end of the air-conditioning body, a mechanical compressor is connected between the first output end of the first three-way valve and the first input end of the second three-way valve, an electric compressor is connected between the second output end of the first three-way valve and the second input end of the second three-way valve, the output end of the second three-way valve is connected to the input end of the oil-gas separator, the first output end of the oil-gas separator is connected to the input end of the first three-way valve, and the second output end of the oil-gas separator is connected to the input end of the condenser; the power unit is connected to the mechanical compressor and the electric compressor, and the power unit can be used to provide power sources for the mechanical compressor and the electric compressor respectively.

[0005] In some embodiments, the power unit includes an engine, a generator, a voltage regulator and a first switch, wherein the engine is connected to the mechanical compressor, the engine is also connected to the generator, the generator is connected to the voltage regulator, the voltage regulator is connected to the electric compressor, and the first switch is connected between the generator and the voltage regulator.

[0006] In some embodiments, the power unit further includes an external power supply and a second switch, wherein the external power supply is connected to the voltage stabilizer, and the second switch is disposed between the external power supply and the voltage stabilizer.

[0007] In some embodiments, an expansion valve is further provided between the dryer and the air conditioner body.

[0008] In some embodiments, the expansion valve is an electronic expansion valve.

[0009] In some embodiments, the condenser is a plate condenser, a shell and tube condenser, or an air-cooled condenser.

[0010] In some embodiments, the dryer is a storage dryer or a receiving dryer.

[0011] In some embodiments, the mechanical compressor is a reciprocating compressor, a rotary compressor, or a centrifugal compressor.

[0012] In some embodiments, the first three-way valve and the second three-way valve are both three-way solenoid valves.

[0013] In some embodiments, the regulator is an AC / DC regulator.

[0014] Compared with the prior art, the present invention provides a vehicle air-conditioning system, which is connected to the output end of the air-conditioning body through the input end of the first three-way valve, a mechanical compressor is connected between the first output end of the first three-way valve and the first input end of the second three-way valve, an electric compressor is connected between the second output end of the first three-way valve and the second input end of the second three-way valve, the output end of the second three-way valve is connected to the input end of the oil-gas separator, the first output end of the oil-gas separator is connected to the input end of the first three-way valve, and the second output end of the oil-gas separator is connected to the input end of the condenser. Channel switching can be performed through the first three-way valve and the second three-way valve. When the mechanical compressor is working, the refrigerant and the compressor lubricating oil can return to the mechanical compressor. When the electric compressor is working, the refrigerant and the compressor lubricating oil can return to the electric compressor. The oil-gas separator can separate the compressor lubricating oil in the refrigerant to prevent the compressor lubricating oil from flowing into the condenser and the air-conditioning body, thereby effectively avoiding damage to the mechanical compressor and the electric compressor due to lack of lubricating oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1is a structural schematic diagram of a vehicle air conditioning system provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the operation of a mechanical compressor in a driving state provided by an embodiment of the present invention; Figure 3 is a schematic diagram of the operation of the electric compressor in the driving state provided by an embodiment of the present invention; Figure 4 Schematic diagram of the operation of the electric compressor in the parking state provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0017] In order to solve the technical problem in the prior art that the compressor lubricating oil is easily lost when the dual-compressor air-conditioning system is in operation, the present invention provides a vehicle air-conditioning system, which can ensure that the air-conditioning system can operate normally when the vehicle is driving or parked, and can prevent the compressor lubricating oil from being lost when the air-conditioning system is in operation.

[0018] See also Figure 1-Figure 4 , Figure 1-Figure 4 A vehicle air conditioning system in an embodiment of the present invention comprises a refrigerant flow path 1, a compressor lubricating oil circuit 2 and a power unit 3, wherein the refrigerant flow path 1 comprises a condenser 11, a dryer 12 and an air conditioning body 13 connected in sequence, the compressor lubricating oil circuit 2 comprises a first three-way valve 21, a second three-way valve 22 and an oil-gas separator 23, the input end of the first three-way valve 21 is connected to the output end of the air conditioning body 13, a mechanical compressor 24 is connected between the first output end of the first three-way valve 21 and the first input end of the second three-way valve 22, the An electric compressor 25 is connected between the second output end of the first three-way valve 21 and the second input end of the second three-way valve 22, the output end of the second three-way valve 22 is connected to the input end of the oil-gas separator 23, the first output end of the oil-gas separator 23 is connected to the input end of the first three-way valve 21, and the second output end of the oil-gas separator 23 is connected to the input end of the condenser 11; the power unit 3 is connected to the mechanical compressor 24 and the electric compressor 25, and the power unit 3 can be used to provide power sources for the mechanical compressor 24 and the electric compressor 25 respectively.

[0019] In this specific embodiment, an expansion valve 14 is further provided between the dryer 12 and the air conditioner body 13. It should be noted that the expansion valve 14 is an electronic expansion valve.

[0020] In this specific embodiment, when the vehicle is running, the power unit 3 can provide a power source for the mechanical compressor 24, the second output end of the first three-way valve 21 is closed, and the second input end of the second three-way valve 22 is closed, ensuring that the refrigerant and the compressor lubricating oil can return to the mechanical compressor 24; when the vehicle stops, the first output end of the first three-way valve 21 is closed, and the first input end of the second three-way valve 22 is closed, ensuring that the refrigerant and the compressor lubricating oil can return to the electric compressor 25.

[0021] In one embodiment, the power unit 3 includes an engine 31, a generator 32, a voltage regulator 33 and a first switch 34, the engine 31 is connected to the mechanical compressor 24, the engine 31 is also connected to the generator 32, the generator 32 is connected to the voltage regulator 33, the voltage regulator 33 is connected to the electric compressor 25, and the first switch 34 is connected between the generator 32 and the voltage regulator 33.

[0022] In addition, the power unit 3 further includes an external power source 35 and a second switch 36 . The external power source 35 is connected to the voltage stabilizer 33 . The second switch 36 is disposed between the external power source 35 and the voltage stabilizer 33 .

[0023] It should be noted that the main working mode of the vehicle air conditioning system includes the driving cooling mode, that is, the engine 31 is the mechanical compressor 24 through the power source, such as Figure 2 As shown, at this time, the vehicle has no external power supply 35, the engine 31 drives the mechanical compressor 24 to operate, and the first switch 34, the second input end of the second three-way valve 22, the second output end of the first three-way valve 21, and the second switch 36 are all in the disconnected state.

[0024] At this time, the refrigerant's running route is mechanical compressor → second three-way valve → oil-gas separator → condenser → dryer → expansion valve → air conditioner body → first three-way valve → mechanical compressor, so that the refrigerant returns to the mechanical compressor, completing the circulation of the refrigerant in the air-conditioning system.

[0025] It should be noted that when the mechanical compressor fails during driving and there is no external power supply, the mechanical compressor 24 and the second switch 36 are disconnected, and the first switch 34 is connected; the engine 31 drives the generator 32 to operate and generate electricity, and the generator 32 transmits electricity to the electric compressor 25, and the electric compressor 25 is operated. At this time, the first output end of the first three-way valve 21 and the first input end of the second three-way valve 22 are disconnected, and the second output end of the first three-way valve and the second input end of the second three-way valve are in the connected state.

[0026] Specifically, the power source of this mode is engine → generator → first switch → converter → electric compressor. The refrigerant operation route of this mode is electric compressor → second three-way valve → oil-gas separator → condenser → dryer → expansion valve → air conditioner body → first three-way solenoid valve → electric compressor. Finally, the refrigerant returns to the electric compressor, completing the circulation of the refrigerant in the air-conditioning system. Among them, the compressor lubricating oil circuit of this mode is electric compressor → second three-way valve → oil-gas separator → first three-way valve → electric compressor, and finally the compressor lubricating oil returns to the electric compressor, completing the circulation of the compressor lubricating oil in the air-conditioning system.

[0027] In this specific embodiment, when the vehicle air conditioning system is in parking cooling mode, Figure 4 As shown, this mode is to solve the working condition of using air conditioning when a traditional fuel vehicle is parked. At this time, the engine is turned off and cannot drive the mechanical compressor and the generator to work. Therefore, the first switch 34, the first input end of the second three-way valve 22, and the first output end of the first three-way valve 21 are all in a disconnected state.

[0028] Specifically, the normal operation of the air conditioning system can be achieved by connecting to the mains or other external power supply, so the second switch 36, the second input end of the second three-way valve 22, and the second output end of the first three-way valve 21 are all in the on state. The external power supply is 220V mains, and power can also be provided by a portable generator or a battery. At the same time, the electric compressor is a DC24V electric air conditioning compressor. Of course, in other embodiments, the electric compressor can also be a DC350V electric air conditioning compressor. Different types of power supplies can be converted into AC / DC or DC / DC through a converter to provide a matching voltage for the electric compressor 25 to achieve the operation of the electric compressor. It should be noted that the power source of this mode is external power supply → second switch → converter → electric compressor. Specifically, the operating route of the air-conditioning refrigerant in this mode is electric compressor → second three-way valve → oil-gas separator → condenser → dryer → expansion valve → air-conditioning body → first three-way valve → electric compressor, and finally the refrigerant returns to the electric compressor, completing the circulation of the refrigerant in the air-conditioning system. Among them, the compressor lubricating oil circuit of this mode is electric compressor → second three-way valve → oil-gas separator → first three-way valve → electric compressor, and finally the compressor lubricating oil returns to the electric compressor, completing the circulation of the compressor lubricating oil in the air-conditioning system.

[0029] It should be noted that the condenser 11 is a plate condenser. Of course, in other embodiments, the condenser 11 may also be a shell and tube condenser or an air-cooled condenser.

[0030] The dryer 12 is a liquid storage dryer. Of course, in other embodiments, the dryer 12 can also be a receiving dryer. It should be noted that the dryer in the in-vehicle air conditioning system plays a very important role in the automobile air conditioning system. The main functions of this component include removing moisture, absorbing moisture in the refrigerant through the internal desiccant (usually silica gel or other hygroscopic materials), preventing water vapor from mixing with the refrigerant to form acidic substances that corrode metal parts, and avoiding ice blockage at the expansion valve.

[0031] It should be noted that the first three-way valve 21 and the second three-way valve 22 are both three-way solenoid valves, and the mechanical compressor 24 is a reciprocating compressor. Of course, in other embodiments, the mechanical compressor 24 can also be a rotary compressor or a centrifugal compressor, wherein the voltage regulator 33 is an AC / DC voltage regulator 33.

[0032] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A vehicle air conditioning system, comprising a refrigerant flow path, a compressor lubricating oil circuit and a power unit, wherein the refrigerant flow path comprises a condenser, a dryer and an air conditioning body connected in sequence, and the compressor lubricating oil circuit comprises a first three-way valve, a second three-way valve and an oil-gas separator, characterized in that: The input end of the first three-way valve is connected to the output end of the air conditioner body, a mechanical compressor is connected between the first output end of the first three-way valve and the first input end of the second three-way valve, an electric compressor is connected between the second output end of the first three-way valve and the second input end of the second three-way valve, the output end of the second three-way valve is connected to the input end of the oil-gas separator, the first output end of the oil-gas separator is connected to the input end of the first three-way valve, and the second output end of the oil-gas separator is connected to the input end of the condenser; the power unit is connected to the mechanical compressor and the electric compressor, and the power unit can be used to provide power sources for the mechanical compressor and the electric compressor respectively.

2. A vehicle air conditioning system according to claim 1, characterized in that: The power unit includes an engine, a generator, a voltage regulator and a first switch, wherein the engine is connected to the mechanical compressor, the engine is also connected to the generator, the generator is connected to the voltage regulator, the voltage regulator is connected to the electric compressor, and the first switch is connected between the generator and the voltage regulator.

3. A vehicle air conditioning system according to claim 2, characterized in that: The power unit further includes an external power supply and a second switch, wherein the external power supply is connected to the voltage stabilizer, and the second switch is arranged between the external power supply and the voltage stabilizer.

4. A vehicle air conditioning system according to claim 1, characterized in that: An expansion valve is also provided between the dryer and the air conditioner body.

5. A vehicle air conditioning system according to claim 4, characterized in that: The expansion valve is an electronic expansion valve.

6. A vehicle air conditioning system according to claim 1, characterized in that: The condenser is a plate condenser, a shell and tube condenser or an air-cooled condenser.

7. A vehicle air conditioning system according to claim 1, characterized in that: The dryer is a liquid storage dryer or a receiving dryer.

8. The vehicle air conditioning system according to claim 1, characterized in that: The mechanical compressor is a reciprocating compressor, a rotary compressor or a centrifugal compressor.

9. The vehicle air conditioning system according to claim 1, characterized in that: The first three-way valve and the second three-way valve are both three-way solenoid valves.

10. The vehicle air conditioning system according to claim 2, characterized in that: The voltage stabilizer is an AC / DC voltage stabilizer.

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