CN114435073A - Cab air conditioning system, control method thereof and engineering machinery - Google Patents
Cab air conditioning system, control method thereof and engineering machinery Download PDFInfo
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- CN114435073A CN114435073A CN202210210053.0A CN202210210053A CN114435073A CN 114435073 A CN114435073 A CN 114435073A CN 202210210053 A CN202210210053 A CN 202210210053A CN 114435073 A CN114435073 A CN 114435073A
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- 238000004378 air conditioning Methods 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 94
- 238000011084 recovery Methods 0.000 claims abstract description 41
- 239000002918 waste heat Substances 0.000 claims abstract description 40
- 238000005485 electric heating Methods 0.000 claims abstract description 30
- 239000002826 coolant Substances 0.000 claims abstract description 5
- 239000010720 hydraulic oil Substances 0.000 claims description 18
- 239000003921 oil Substances 0.000 claims description 6
- 239000003507 refrigerant Substances 0.000 description 12
- 230000000694 effects Effects 0.000 description 5
- 239000007789 gas Substances 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000005057 refrigeration Methods 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010257 thawing Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000012905 input function Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00735—Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
- B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
- B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/22—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant
- B60H1/2215—Heating, cooling or ventilating [HVAC] devices the heat being derived otherwise than from the propulsion plant the heat being derived from electric heaters
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention provides a cab air conditioning system, a control method thereof and engineering machinery, wherein the air conditioning system comprises a heat pump heating system, a waste heat recovery system and an electric heating system, and the control method comprises the following steps: step S1, setting a preset temperature; step S2, controlling the electric heating system to be turned on or off according to the difference value between the temperature in the cab and the preset temperature; and/or controlling the on or off of the heat pump heating system according to the external environment temperature; and/or controlling the opening or closing of the waste heat recovery system according to the temperature of the cooling medium so as to enable the temperature in the cab to reach the preset temperature. According to the control method, the heat pump heating system, the waste heat recovery system and the electric heating system are combined according to the external temperature and the condition of the heating medium, so that the heat requirement of the cab can be met, reasonable heat management is performed, the energy utilization efficiency is further improved, and the heating efficiency of the cab is improved.
Description
Technical Field
The invention relates to the technical field of engineering machinery, in particular to a cab air conditioning system, a control method thereof and engineering machinery.
Background
In the areas suitable for winter excavation in China, the environmental temperature is generally set to-12 ℃. According to the requirement that the comfortable temperature suitable for working of personnel is 16-25 ℃, the comfort of personnel is considered, and the operation power consumption of the whole machine is also considered. According to the CE standard, the temperature in the cab can be raised and kept above 18 ℃ in a cold environment, and the heating system has the heating capacity of raising the temperature to 25 ℃ within at least 30 min. The traditional fuel excavator cab is usually heated by a PTC heater, but the PTC heater has high energy consumption, the consumed electric energy cannot be completely converted into heat energy, and the COP is 1 under an ideal condition. The COP of the heat pump heating system is constantly larger than 1, generally higher than 1.5, and the heat pump heating system has good economical efficiency, so that some excavators select the heat pump heating system to heat the cab.
However, the heat pump air conditioner can achieve the purpose of heating the carriage quickly above 0 ℃, but the heating capacity is obviously weakened in a low-temperature environment (lower than-5 ℃), the heat pump air conditioner cannot work normally at-10 ℃, the heat pump air conditioner is not suitable for serving as a single heating strategy to supply heat to the electric excavator in winter, and a new heating mode is urgently needed to be suitable for supplying heat to the excavator in winter.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defects of low utilization rate of heating energy and low heating efficiency of the cab in the prior art, so as to provide a control method of an air conditioning system of the cab.
The air conditioning system comprises a heat pump heating system, a waste heat recovery system and an electric heating system, and the control method comprises the following steps: step S1, setting a preset temperature; step S2, controlling the electric heating system to be turned on or off according to the difference value between the temperature in the cab and the preset temperature; and/or controlling the on or off of the heat pump heating system according to the external environment temperature; and/or controlling the opening or closing of the waste heat recovery system according to the temperature of the cooling medium so as to enable the temperature in the cab to reach the preset temperature.
Optionally, the heat source of the waste heat recovery system is one or more of hydraulic oil, an engine, or a controller.
Optionally, the heat source of the waste heat recovery system is hydraulic oil, and step S2 further includes: and when the temperature of the hydraulic oil is less than 40 ℃, closing the waste heat recovery system.
Optionally, step S2 further includes: and when the external environment temperature is less than 0 ℃, closing the heat pump heating system.
Optionally, step S2 further includes: the heating amount of the heat pump heating system is controlled by PID control.
The present invention also provides a cab air conditioning system, comprising: a heat pump heating system; a waste heat recovery system; an electrical heating system; the heat exchange device is suitable for heating the space in the cab and is connected with the heat pump heating system, the electric heating system and the waste heat recovery system; and the controller is used for controlling the opening and closing of the heat pump heating system, the electric heating system and the waste heat recovery system.
Optionally, the heat pump heating system comprises a compressor, a first temperature sensor, a reversing valve and an expansion valve connected in series by a first pipeline.
Optionally, the electric heating system comprises a second temperature sensor, a PTC heater and a first circulation pump, which are connected in series by a second pipeline.
Optionally, the waste heat recovery system includes a third temperature sensor, an oil tank and a second circulation pump that are connected in sequence through a third pipeline.
The invention also provides engineering machinery comprising the cab air conditioning system.
The invention also provides engineering machinery comprising the air conditioning system.
The invention has the following advantages:
1. according to the control method, the heat pump heating system, the waste heat recovery system and the electric heating system are combined according to the external temperature and the condition of the heating medium, so that the heat requirement of the cab can be met, reasonable heat management is performed, the energy utilization efficiency is further improved, and the heating efficiency of the cab is improved.
2. The controller selects PID closed-loop control, can set control conditions according to different working conditions and external environments of the excavator, switches different modes, and adjusts the temperature in the cab.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a schematic diagram of a control system of an embodiment of the present invention;
fig. 2 shows a flowchart of a control method of an embodiment of the present invention.
Description of reference numerals:
1. a heat pump heating system; 2. a waste heat recovery system; 3. an electrical heating system; 11. a compressor; 12. a first temperature sensor; 13. a diverter valve; 14. an expansion valve; 15. a defrosting heater; 21. a third temperature sensor; 22. an oil tank; 23. a second circulation pump; 31. a second temperature sensor; 32. a PTC heater; 33. a first circulation pump; 4. a fan; 5. and a heat exchange device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1 and 2, the cab air conditioning system of the engineering machine in the embodiment includes a refrigeration branch and a heating branch, wherein the heating branch includes a heat pump heating system 1, an electric heating system 3, a waste heat recovery system 2 and a control system, and according to a cab target temperature set by a worker, each parameter of the system is adjusted, and the three are combined to meet the requirement of comfort of a driver.
The heat pump heating system 1 is a system that performs heating using a change in the state of the refrigerant. A heat pump heating system generally employs a compressor to change the state of refrigerant and a condenser to achieve a heating effect.
It should be noted that the electric heating system 3 is to generate heat after passing current through the conductive medium, so as to achieve the heating effect. The electric heating system can be a PCT heater (i.e. composed of a PTC ceramic heating element and an aluminum tube), or a heating resistance heater. Preferably, this example is a PTC heating system.
The waste heat recovery system 2 is a system for recovering heat from a heat source (heat-generating solid or liquid) in the construction machine. Further, the heat source may be an engine, a controller (e.g., a DC/DC controller), hydraulic oil, and the like. Preferably, the waste heat recovery system 2 in this embodiment is a hydraulic oil heating system, that is, the waste heat recovery system 2 heats the space in the cab by using the heat of the hydraulic oil.
The heat pump heating system, the electric heating system 3, and the waste heat recovery system in the present embodiment will be described in detail below.
A heat pump heating system:
as shown in fig. 1, in the solution of the present embodiment, the heat pump heating system 1 includes a compressor 11, a first temperature sensor 12, a reversing valve 13, and an expansion valve 14, which are connected in series by a first pipeline. The first temperature sensor 12 may be used to detect an external environment temperature, the compressor 11 may lift low-pressure gas into high-pressure gas, the compressor 11 may suck low-temperature low-pressure refrigerant gas from the air suction pipe, and after the compressor is driven by the operation of the motor to compress the refrigerant gas, the high-temperature high-pressure refrigerant gas may be discharged to the air discharge pipe to provide power for the refrigeration cycle. Wherein, the refrigerant is ternary non-azeotropic refrigerant R407C, and R407C is environment-friendly refrigerant without destroying ozone layer. The heat pump heating system 1 may further include a defrosting heater 15 to increase an operation temperature region of the heat pump heating system 1, further increase COP of the system, and increase energy utilization.
The reversing valve 13 is a four-way reversing valve 13, and the four-way reversing valve 13 changes the flow direction of the refrigerant by changing the flow channel of the refrigerant, so as to switch the refrigeration mode and the heating mode.
In this embodiment, the COP of the heat pump heating system 1 is constantly greater than 1, generally greater than 1.5, and good economy is achieved. The purpose of heating a cab can be quickly realized by the heat pump heating system at the temperature of more than 0 ℃, but the heating capacity is obviously weakened at low temperature, particularly below-5 ℃, the heat pump heating system can not normally work at the temperature of-10 ℃, and the heat pump heating system is suitable for heating at the temperature of more than 0 ℃. Therefore, in the present embodiment, when the temperature detected by the first temperature sensor 12 is less than 0 ℃, the heat pump heating system 1 is turned off.
A waste heat recovery system:
as shown in fig. 1, in the solution of the present embodiment, the waste heat recovery system 2 includes a third temperature sensor 21, an oil tank 22 and a second circulation pump 23 which are connected in sequence through a third pipeline. The oil tank 22 is provided in the cab, the third temperature sensor 21 is provided in the oil tank 22, the hydraulic oil temperature is measured by the third temperature sensor 21, and the opening and closing of the heat pump heating system 1 and the heat recovery system 2 are determined based on the measurement values of the first temperature sensor 12 and the third temperature sensor 21. The hydraulic oil temperature of the excavator is about 60 ℃ in a winter environment, and after the temperature is lower than 40 ℃, the hydraulic oil becomes viscous, and the frictional resistance of the third pipeline increases, resulting in a decrease in the operability of the excavator.
Therefore, the residual heat of the hydraulic oil above 40 ℃ can be utilized, so in the embodiment, when the hydraulic oil is lower than 40 ℃, the third pipeline is disconnected, and only the heat pump heating system 1 and the electric heating system 3 are utilized for heating. When the external environment temperature is lower than 0 ℃, the heat pump heating system 1 is also disconnected, and only the electric heating system 3 is used for heating. Therefore, according to different conditions of the environment temperature and the temperature of the hydraulic oil, the heat pump heating system 1, the waste heat recovery system 2 and the electric heating system 3 are combined with each other to provide heat for the cab, energy waste is avoided, and the excavator is guaranteed to be in the best working state.
Of course, as mentioned above, the heat source of the waste heat recovery system may also be an engine or a DC/DC controller. Further, the operating temperature of the engine is in the range of 10-70 ℃ and the operating temperature of the DC/DC controller is in the range of 10-55 ℃. The on-off condition of the third pipeline can be adaptively adjusted according to different forms of heat sources.
An electric heating system:
as shown in fig. 1, in the solution of the present embodiment, the electric heating system 3 includes a second temperature sensor 31, a PTC heater 32 and a first circulation pump 33 which are connected in sequence through a second pipe. The refrigerant in the second pipeline is mixed with the ethanol and the water in a one-to-one ratio, and the ethanol and the water are mixed outdoors in a cold environment to achieve a good anti-freezing effect. The opening and closing of the PTC is determined based on the difference between the actual temperature of the cab and the set temperature. The PTC heater 32 may employ a conventional PTC heating device, which is composed of a PTC ceramic heating element and an aluminum tube. The PTC heating body has the advantages of small thermal resistance and high heat exchange efficiency, and has the characteristics of automatic constant temperature and power saving. Has good safety performance.
Of course, other electrically heated materials may be used for the electrical heating system 3.
As shown in fig. 1, the cab air conditioning system in the present embodiment further includes a heat exchanging device 5. Preferably, the heat exchanging device 5 is a heat exchanger, and the first pipeline, the second pipeline and the third pipeline are all connected with the heat exchanger, so that the media in the heat pump heating system 1, the waste heat recovery system 2 and the electric heating system 3 can flow into the heat exchanging device, and heat exchange is performed on external cold air, so that the heating effect is achieved.
Further, the cab air conditioning system further comprises a fan 4, and the fan 4 is arranged opposite to the heat exchanger. Because the first pipeline, the second pipeline and the third pipeline are all connected with the heat exchanger, the heat pump heating system 1, the electric heating system 3 and the waste heat recovery system 2 share one fan 4. The rotational speed of the fan 4, and thus the heating speed, can be adjusted according to the preset temperature of the set cab and the actual temperature in the cab.
Preferably, the air conditioning system of the present embodiment further includes a controller. The controller is used for controlling the air conditioning system and enabling the temperature in the cab to reach a preset temperature. Further, the controller is connected to the first temperature sensor 12, the second temperature sensor 31 and the third temperature sensor 21. The controller is also connected to a switching structure (e.g., a valve, a reversing valve, etc.) that controls the first, second, and third lines to open or close. The controller is also connected to the compressor 11, the first circulation pump 33, the second circulation pump 23 and the fan 4.
In this embodiment, the controller selects PID closed-loop control, and the parameter (cab temperature) of the air conditioning system at the previous time is used as the input parameter of the condenser of the heat pump heating system 1 to obtain the predicted values of the state of the refrigerant side of the heat exchanger and the enthalpy of the inlet and the outlet at the current time. And then, calculating according to the steps of the heat pump heating system 1 and the electric heating system 3 to obtain the system state at the current moment. When the vehicle is driven, the actual temperature of the cab is lower than the preset temperature, and the maximum temperature difference is within the range of 5 ℃, the PTC heating relay is closed to start working, and a heating stopping instruction is sent.
Setting the difference between the target value and the output function value:
where u (t) is the PID controller output function; kp is a proportionality coefficient; ti is the integration time constant; kd is the differential coefficient and err (t) is the PID controller input function, setting the difference between the target value and the output value for temperature.
As shown in fig. 2, the present embodiment further provides a control method of a cab air conditioning system, where the air conditioning system includes a heat pump heating system 1, a waste heat recovery system 2, and an electric heating system 3, and the control method includes the following steps:
step S1, setting a preset temperature;
step S2, controlling the electric heating system 3 to be turned on or off according to the difference between the temperature in the cab and a preset temperature; and/or controlling the on or off of the heat pump heating system 1 according to the external environment temperature; and/or controlling the waste heat recovery system 2 to be turned on or off according to the temperature of the cooling medium so as to enable the temperature in the cab to reach the preset temperature.
Preferably, the cab air conditioning system in the present embodiment is the above-described air conditioning system.
In this embodiment, the heat pump heating system 1, the waste heat recovery system 2, and the electric heating system 3 are combined to supply heat to the cab, and the heating systems are controlled to be turned on and off according to the external environment and the state of the cooling medium, so that the effect of improving the energy utilization rate is achieved, and the heating efficiency of the cab is greatly improved.
Preferably, the heat source of the waste heat recovery system 2 is one or more of hydraulic oil, an engine or a controller.
Further, the heat source of the waste heat recovery system 2 is hydraulic oil, and step S2 further includes:
and when the temperature of the hydraulic oil is less than 40 ℃, closing the waste heat recovery system.
As shown in fig. 2, in the technical solution of this embodiment, step S2 further includes:
and when the external environment temperature is less than 0 ℃, closing the heat pump heating system.
As shown in fig. 2, in the technical solution of this embodiment, step S2 further includes:
the heating amount of the heat pump heating system 1 is controlled by PID control.
The embodiment also provides engineering machinery which comprises the cab air conditioning system. The engineering machinery can be an excavator, a crane, a pump truck and the like.
Preferably, the construction machine in the present embodiment is an excavator, and the excavator is an electric excavator.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. This need not be, nor should it be exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (10)
1. A control method of a cab air conditioning system, characterized in that the air conditioning system comprises a heat pump heating system (1), a waste heat recovery system (2) and an electric heating system (3), the control method comprising the steps of:
step S1, setting a preset temperature;
step S2, controlling the electric heating system (3) to be turned on or off according to the difference between the temperature in the cab and the preset temperature; and/or controlling the on or off of the heat pump heating system (1) according to the external environment temperature; and/or controlling the opening or closing of the waste heat recovery system (2) according to the temperature of the cooling medium so as to enable the temperature in the cab to reach the preset temperature.
2. The control method according to claim 1, characterized in that the heat source of the waste heat recovery system (2) is one or more of hydraulic oil, an engine or a controller.
3. The control method according to claim 1, wherein the heat source of the waste heat recovery system (2) is hydraulic oil, and the step S2 further includes:
and when the temperature of the hydraulic oil is less than 40 ℃, closing the waste heat recovery system.
4. The control method according to any one of claims 1 to 3, wherein the step S2 further includes:
and when the external environment temperature is less than 0 ℃, closing the heat pump heating system.
5. The control method according to any one of claims 1 to 3, wherein the step S2 further includes:
the heating amount of the heat pump heating system (1) is controlled by PID.
6. A cab air conditioning system, comprising:
a heat pump heating system (1);
a waste heat recovery system (2);
an electric heating system (3);
the heat exchange device (5) is suitable for heating the space in the cab and is connected with the heat pump heating system (1), the electric heating system (3) and the waste heat recovery system (2);
and the controller is used for controlling the opening and closing of the heat pump heating system (1), the electric heating system (3) and the waste heat recovery system (2).
7. Cab air conditioning system according to claim 6, wherein the heat pump heating system (1) comprises a compressor (11), a first temperature sensor (12), a reversing valve (13) and an expansion valve (14) connected in series by a first line.
8. Driver's cabin air conditioning system according to claim 6, characterized in that the electric heating system (3) comprises a second temperature sensor (31), a PTC heater (32) and a first circulation pump (33) connected in series by a second line.
9. The cab air conditioning system according to claim 6, wherein the waste heat recovery system includes a third temperature sensor (21), an oil tank (22), and a second circulation pump (23) connected in series by a third pipe.
10. A working machine, characterized in that it comprises a cabin air conditioning system according to any one of claims 1-6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210210053.0A CN114435073B (en) | 2022-03-04 | 2022-03-04 | Cab air conditioning system, control method thereof and engineering machinery |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210210053.0A CN114435073B (en) | 2022-03-04 | 2022-03-04 | Cab air conditioning system, control method thereof and engineering machinery |
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| CN114435073A true CN114435073A (en) | 2022-05-06 |
| CN114435073B CN114435073B (en) | 2023-11-21 |
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