Waste heat recovery system, method and construction machine

Abstract

The application relates to a waste heat recovery system, method and engineering machinery, and relates to the technical field of engineering machinery.The waste heat recovery system comprises a hydraulic device, a first three-way valve, a second three-way valve, a first heat exchanger, an oil radiator, an oil dispersion system water pump and a battery pack.The first valve port of the first three-way valve is in communication with one end of the hydraulic device.The second valve port of the second three-way valve is in communication with the other end of the hydraulic device.The two ends of the first heat exchanger are respectively in communication with the third valve port of the first three-way valve and the first valve port of the second three-way valve.The two ends of the oil radiator are respectively connected with the second valve port of the first three-way valve and the third valve port of the second three-way valve.One end of the oil dispersion system water pump is connected with the first heat exchanger.The two ends of the battery pack are respectively in communication with the other end of the oil dispersion system water pump and the first heat exchanger.The waste heat recovery system, method and engineering machinery can fully utilize the heat generated during the operation of the hydraulic device, thereby reducing heat waste.

Description

Technical Field

[0001] This application relates to the field of engineering machinery technology, specifically to a waste heat recovery system, method, and engineering machinery. Background Technology

[0002] Currently, during the operation of construction machinery, the heat generated by the hydraulic system is typically dissipated into the air through the radiator. In low ambient temperatures, the battery needs to be heated, usually by using an electric heater. This wastes the heat generated by the hydraulic system and also increases the vehicle's overall energy consumption. Related waste heat recovery systems can use the heat generated by the hydraulic system to heat the battery pack, thus reducing heat waste. However, in these systems, during the heating of the battery pack using the heat generated by the hydraulic system, the coolant carrying the heat passes through the radiator, which absorbs some of the heat. This results in the heat generated by the hydraulic system not being fully utilized, leading to further heat waste. Summary of the Invention

[0003] To address the aforementioned technical problems, embodiments of this application provide a waste heat recovery system, method, and engineering machinery that can fully utilize the heat generated during the operation of hydraulic devices, thereby reducing heat waste.

[0004] Firstly, a waste heat recovery system is provided, comprising: Hydraulic devices; The first three-way valve, wherein the first valve port of the first three-way valve is connected to one end of the hydraulic device; The second three-way valve, the second valve port of the second three-way valve is connected to the other end of the hydraulic device; The first heat exchanger has its two ends connected to the third valve port of the first three-way valve and the first valve port of the second three-way valve, respectively. An oil radiator, with its two ends connected to the second valve port of the first three-way valve and the third valve port of the second three-way valve, respectively; An oil-dissipation system water pump, one end of which is connected to the first heat exchanger; The battery pack has two ends connected to the other end of the water pump of the oil distribution system and the first heat exchanger, respectively.

[0005] According to a first aspect of this application, the waste heat recovery system further includes: The third three-way valve, wherein the first valve port of the third three-way valve is connected to one end of the battery pack; An electric motor-controlled water pump, one end of which is connected to the third valve port of the third three-way valve; The fourth three-way valve, wherein the first valve port of the fourth three-way valve is connected to the other end of the electric motor-controlled water pump; The sixth three-way valve, wherein the first valve port of the sixth three-way valve is connected to one end of the battery pack; The seventh three-way valve, wherein the first valve port of the seventh three-way valve is connected to the third valve port of the sixth three-way valve 10; A water radiator, wherein both ends of the water radiator are respectively connected to the second valve port of the sixth three-way valve and the second valve port of the third three-way valve; and The motor control assembly has two ends connected to the second valve port of the fourth three-way valve and the second valve port of the seventh three-way valve, respectively.

[0006] According to a first aspect of this application, the waste heat recovery system further includes: Evaporator assembly; A first shut-off valve, the two ends of which are respectively connected to the first heat exchanger and the evaporator assembly; The second shut-off valve has one end connected to the evaporator assembly and the other end connected to the oil distribution system water pump.

[0007] According to a first aspect of this application, the waste heat recovery system further includes: The passenger compartment hot water pump has one end connected to one end of the evaporator assembly, the other end of the passenger compartment hot water pump connected to the third valve port of the fourth three-way valve, and the other end of the evaporator assembly connected to the third valve port of the seventh three-way valve.

[0008] According to a first aspect of this application, the waste heat recovery system further includes: A first expansion valve, one end of which is connected to the evaporator assembly; A first condenser, one end of which is connected to the other end of the first expansion valve; The crew cabin refrigeration compressor is connected at both ends to the evaporator assembly and the first condenser, respectively.

[0009] According to a first aspect of this application, the waste heat recovery system further includes: The third shut-off valve is connected at both ends to the battery pack and the first heat exchanger, respectively. The fourth shut-off valve is connected at both ends to the battery pack and the oil dispersing system water pump, respectively.

[0010] According to a first aspect of this application, a battery-powered water pump, one end of which is connected to the battery pack; The second heat exchanger has one end connected to the other end of the battery circuit water pump; The fifth shut-off valve is connected at both ends to the second heat exchanger and the battery pack, respectively. A battery cooling compressor, one end of which is connected to the second heat exchanger; A second condenser, one end of which is connected to the other end of the battery cooling compressor; The second expansion valve is connected at both ends to the second condenser and the second heat exchanger, respectively.

[0011] Secondly, a waste heat recovery control method is also provided, applied to the waste heat recovery system described in the previous embodiment, the waste heat recovery control method comprising: The first and third valve ports of the first three-way valve are opened, and the second valve port is closed. The first and second valve ports of the second three-way valve are opened, and the third valve port is closed, so that the hydraulic device, the second three-way valve, the first three-way valve, and the first heat exchanger constitute a first oil circulation loop. The oil-dissipation system water pump is turned on so that the first heat exchanger, the oil-dissipation system water pump, and the battery pack form a first heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat and then heat the battery pack.

[0012] According to a second aspect of this application, the waste heat recovery system further includes: The third three-way valve, wherein the first valve port of the third three-way valve is connected to one end of the battery pack; An electric motor-controlled water pump, one end of which is connected to the third valve port of the third three-way valve; The fourth three-way valve, wherein the first valve port of the fourth three-way valve is connected to the other end of the electric motor-controlled water pump; The sixth three-way valve, wherein the first valve port of the sixth three-way valve is connected to one end of the battery pack; The seventh three-way valve, wherein the first valve port of the seventh three-way valve is connected to the third valve port of the sixth three-way valve 10; A water radiator, wherein both ends of the water radiator are respectively connected to the second valve port of the sixth three-way valve and the second valve port of the third three-way valve; and The motor control assembly has two ends connected to the second valve port of the fourth three-way valve and the second valve port of the seventh three-way valve, respectively. The waste heat recovery control method further includes: The first and second valve ports of the fourth three-way valve are opened, and the third valve port is closed. The first and third valve ports of the third three-way valve are opened, and the second valve port is closed. The first and third valve ports of the sixth three-way valve are opened, and the second valve port is closed. The first and second valve ports of the seventh three-way valve are opened, and the third valve port is closed. The motor-controlled water pump is turned on so that the motor-controlled component, the seventh three-way valve, the sixth three-way valve, the battery pack, the third three-way valve, the motor-controlled water pump, and the fourth three-way valve form a second heat dissipation circulation water circuit, so as to convert the heat generated by the motor-controlled component into water heat and then heat the battery pack.

[0013] According to a second aspect of this application, the waste heat recovery system further includes: Evaporator assembly; A first shut-off valve, the two ends of which are respectively connected to the first heat exchanger and the evaporator assembly; The second shut-off valve has one end connected to the evaporator assembly and the other end connected to the oil distribution system water pump.

[0014] The waste heat recovery control method further includes: Control the opening of the first and second shut-off valves; The oil-dissipating system water pump is turned on so that the first heat exchanger, the oil-dissipating system water pump, the first shut-off valve, the evaporator assembly, and the second shut-off valve form a third heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat and provide heating heat to the evaporator assembly.

[0015] According to a second aspect of this application, the waste heat recovery system further includes: A hot water pump for the crew compartment is provided, one end of which is connected to one end of the evaporator assembly, the other end of which is connected to the third valve port of the fourth three-way valve, and the other end of the evaporator assembly is connected to the third valve port of the seventh three-way valve. The waste heat recovery control method further includes: The second and third valve ports of the fourth three-way valve are opened, and the first valve port is closed. The second and third valve ports of the seventh three-way valve are opened, and the first valve port is closed. The crew compartment hot water pump is turned on so that the motor control assembly, the fourth three-way valve, the crew compartment hot water pump, the evaporator assembly, and the seventh three-way valve form a fourth heat dissipation circulation water circuit, so that the heat generated by the motor control assembly is converted into hydrothermal heat and then provides heating heat to the evaporator assembly.

[0016] Thirdly, an engineering machinery is also provided, including: Waste heat recovery system as described in the previous embodiment.

[0017] The waste heat recovery system, method, and engineering machinery provided in this application embodiment control the oil-dissipation system water pump to form a first heat dissipation circulation water path consisting of a first heat exchanger, the oil-dissipation system water pump, and the battery pack. This converts the oil heat generated by the hydraulic device into water heat to heat the battery pack. When utilizing the heat generated by the hydraulic device, the coolant does not pass through the oil radiator, avoiding the oil radiator absorbing some of the heat. All the heat generated by the hydraulic device is used to heat the battery pack, thereby achieving full utilization of the heat generated by the hydraulic device and effectively reducing heat waste. Attached Figure Description

[0018] The above and other objects, features, and advantages of this application will become more apparent from the more detailed description of the embodiments of this application in conjunction with the accompanying drawings. The drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof. In the drawings, the same reference numerals generally represent the same components or steps.

[0019] Figure 1 This is a schematic diagram of a waste heat recovery system provided for an exemplary embodiment of this application.

[0020] Figure 2 A schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application.

[0021] Figure 3 A schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application.

[0022] Figure 4 A schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application.

[0023] Figure 5 A schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application.

[0024] Figure 6 This is a schematic flowchart of a waste heat recovery method provided for an exemplary embodiment of this application.

[0025] Figure 7 A schematic flowchart of a waste heat recovery method provided for another exemplary embodiment of this application.

[0026] Figure 8 A schematic flowchart of a waste heat recovery method provided for another exemplary embodiment of this application.

[0027] Figure 9 A schematic flowchart of a waste heat recovery method provided for another exemplary embodiment of this application.

[0028] Figure reference numerals: 100-Waste heat recovery system; 1-Battery cooling compressor; 2-Battery circuit water pump; 3-Third three-way valve; 4-Motor-controlled water pump; 5-Fourth three-way valve; 6-Cruise compartment hot water pump; 7-First expansion valve; 8-Cruise compartment refrigeration compressor; 9-Seventh three-way valve; 10-Sixth three-way valve; 11-Fifth shut-off valve; 12-Second expansion valve; 13-First fan; 14-Second fan; 15-Third fan; 16-Fourth fan; 17-First... 18-Second three-way valve; 19-Oil evaporator system water pump; 20-Third shut-off valve; 21-First shut-off valve; 22-Fourth shut-off valve; 23-Second shut-off valve; 24-Hydraulic device; 241-Working device; 242-Oil pump; 25-First heat exchanger; 26-Battery pack; 27-Motor and electronic control components; 28-Evaporator assembly; 29-Water radiator; 30-Oil radiator; 31-Second heat exchanger; 32-First condenser; 33-Second condenser. Detailed Implementation

[0029] Hereinafter, exemplary embodiments according to this application will be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this application, and not all embodiments of this application. It should be understood that this application is not limited to the exemplary embodiments described herein.

[0030] Figure 1 This is a schematic diagram of a waste heat recovery system provided for an exemplary embodiment of this application. Figure 1 As shown in the figure, the waste heat recovery system 100 provided in this application embodiment may include a hydraulic device 24. In practical applications, the hydraulic device 24 can be used to assist in performing different operations, such as walking operations, hoisting operations, etc.

[0031] like Figure 1 As shown, the hydraulic device 24 may include a working device 241 and an oil pump 242. The oil pump 242 can drive hydraulic oil to the working device 241, and then assist the working device 241 in performing the corresponding operation.

[0032] like Figure 1As shown, the waste heat recovery system 100 may further include a first three-way valve 17, a second three-way valve 18, a first heat exchanger 25, an oil radiator 30, an oil distribution system water pump 19, and a battery pack 26. The first valve port 171 of the first three-way valve 17 is connected to one end of the hydraulic device 24, and the second valve port 182 of the second three-way valve 18 is connected to the other end of the hydraulic device 24. The two ends of the first heat exchanger 25 are respectively connected to the third valve port 173 of the first three-way valve 17 and the first valve port 181 of the second three-way valve 18. The two ends of the oil radiator 30 are respectively connected to the second valve port 172 of the first three-way valve 17 and the third valve port 183 of the second three-way valve 18. One end of the oil distribution system water pump 19 is connected to the first heat exchanger 25, and the two ends of the battery pack 26 are respectively connected to the other end of the oil distribution system water pump 19 and the first heat exchanger 25.

[0033] In practical applications, controlling the first valve port 171 and the third valve port 173 of the first three-way valve 17 to open and the second valve port 172 to close; controlling the first valve port 181 and the second valve port 182 of the second three-way valve 18 to open and the third valve port 183 to close, can make the hydraulic device 24, the second three-way valve 18, the first three-way valve 17 and the first heat exchanger 25 form a first oil circulation loop.

[0034] In one embodiment, the hydraulic oil output by the oil pump passes through the hydraulic device 24, which performs corresponding operations. The hydraulic oil generates heat, and the hydraulic oil output from the hydraulic device 24 has a high temperature. The hydraulic oil output from the hydraulic device 24 passes through the first heat exchanger 25, where the coolant and hydraulic oil can exchange heat, thereby reducing the temperature of the hydraulic oil. The hydraulic oil output from the first heat exchanger 25 can then return to the hydraulic device 24.

[0035] In one embodiment, the first heat exchanger 25 may include a tubular heat exchanger, a plate tube heat exchanger, etc.

[0036] like Figure 1 As shown, battery pack 26 can provide electrical power to electrical components in engineering machinery. It should be understood that in low ambient temperatures, battery pack 26 needs to be heated to ensure it operates at an optimal temperature.

[0037] Specifically, by controlling the oil-dissipation system water pump 19 to open, the first heat exchanger 25, the oil-dissipation system water pump 19, and the battery pack 26 can form a first heat dissipation circulation water circuit. In this way, the hydraulic oil output from the hydraulic device 24 is input into the first heat exchanger 25, where the hydraulic oil and coolant exchange heat. The oil-dissipation system water pump 19 can then transport the coolant from the first heat exchanger 25 to the battery pack 26, thus achieving the effect of converting the oil heat generated by the hydraulic device 24 into water heat, and using the heat from the hydraulic oil in the hydraulic device 24 to heat the battery pack 26.

[0038] It should be understood that the waste heat recovery system 100 provided in this application embodiment controls the oil radiator system water pump 19 to open, so that the first heat exchanger 25, the oil radiator system water pump 19, and the battery pack 26 form a first heat dissipation circulation water path, so as to convert the oil heat generated by the hydraulic device 24 into water heat to heat the battery pack 26. When utilizing the heat generated by the hydraulic device 24, the coolant does not pass through the oil radiator 30, avoiding the oil radiator 30 from absorbing part of the heat. All the heat generated by the hydraulic device 24 is used to heat the battery pack 26, thereby achieving the effect of fully utilizing the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0039] like Figure 1 As shown, the waste heat recovery system 100 may further include a third three-way valve 3, a motor-controlled water pump 4, a fourth three-way valve 5, a sixth three-way valve 10, a seventh three-way valve 9, a water radiator 29, and a motor-controlled component 27. The first valve port 301 of the third three-way valve 3 is connected to one end of the battery pack 26; one end of the motor-controlled water pump 4 is connected to the third valve port 303 of the third three-way valve 3; the first valve port 51 of the fourth three-way valve 5 is connected to the other end of the motor-controlled water pump 4; the first valve port 101 of the sixth three-way valve 10 is connected to one end of the battery pack 26; the first valve port 91 of the seventh three-way valve 9 is connected to the third valve port 103 of the sixth three-way valve 10; both ends of the water radiator 29 are connected to the second valve port 102 of the sixth three-way valve 10 and the second valve port 302 of the third three-way valve 3, respectively; and both ends of the motor-controlled component 27 are connected to the second valve port 52 of the fourth three-way valve 5 and the second valve port 92 of the seventh three-way valve 9, respectively.

[0040] It should be noted that the motor control assembly 27 can be used to issue control commands to control the operation of the entire construction machinery vehicle. It should be understood that the motor control assembly 27 generates a significant amount of heat during operation.

[0041] In practical applications, the first valve port 51 and the second valve port 52 of the fourth three-way valve 5 are opened, and the third valve port 53 is closed; the first valve port 301 and the third valve port 303 of the third three-way valve 3 are opened, and the second valve port 302 is closed; the first valve port 101 and the third valve port 103 of the sixth three-way valve 10 are opened, and the second valve port 102 is closed; the first valve port 91 and the second valve port 92 of the seventh three-way valve 9 are opened, and the third valve port 3 is closed; the motor-controlled water pump 4 is opened, so that the motor-controlled component 27, the seventh three-way valve 9, the sixth three-way valve 10, the battery pack 26, the third three-way valve 3, the motor-controlled water pump 4, and the fourth three-way valve 5 form a second heat dissipation circulation water circuit. In this way, the motor-controlled water pump 4 can drive the coolant through the motor-controlled component 27, and the coolant can absorb the heat generated by the motor-controlled component 27. Then the coolant can pass through the battery pack 26, and the heat carried by the coolant can heat the battery pack 26.

[0042] It should be understood that after the heat generated by the motor control component 27 is converted into hydrothermal heat, the coolant will not pass through the water radiator 29 during the process of heating the battery pack 26, thus avoiding the water radiator 29 absorbing some of the heat. All the heat generated by the motor control component 27 is used to heat the battery pack 26, thereby achieving the effect of making full use of the heat generated by the motor control component 27 and effectively reducing heat waste.

[0043] like Figure 1 As shown, the waste heat recovery system 100 may further include an evaporator assembly 28, a first shut-off valve 21, and a second shut-off valve 23. The evaporator assembly 28 can heat or cool the passenger compartment. The two ends of the first shut-off valve 21 are connected to the first heat exchanger 25 and the evaporator assembly 28, respectively. One end of the second shut-off valve 23 is connected to the evaporator assembly 28, and the other end of the second shut-off valve 23 is connected to the oil evaporator system pump 19.

[0044] In practical applications, controlling the opening of the first shut-off valve 21 and the second shut-off valve 23, and controlling the opening of the oil-dissipation system water pump 19, can enable the first heat exchanger 25, the oil-dissipation system water pump 19, the first shut-off valve 21, the evaporator assembly 28, and the second shut-off valve 23 to form a third heat dissipation circulation water circuit.

[0045] Specifically, the oil-dissipation system water pump 19 can drive the coolant through the first heat exchanger 25. Combined with the aforementioned first oil circulation loop, the coolant and hydraulic oil exchange heat in the first heat exchanger 25. That is, the coolant can absorb the heat from the hydraulic oil output from the hydraulic device 24. Then the coolant can pass through the evaporator assembly 28. The evaporator assembly 28 can use the heat carried by the coolant to heat the crew compartment and meet the heating requirements of the crew compartment.

[0046] It should be understood that, after the oil heat generated by the hydraulic device 24 is converted into water heat, the coolant will not pass through the oil radiator 30 during the process of providing heating heat to the evaporator assembly 28. This avoids the water-oil radiator 30 absorbing some of the heat, and all the heat generated by the hydraulic device 24 is used to heat the crew compartment, thereby achieving the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0047] like Figure 1 As shown, the waste heat recovery system 100 may include a passenger compartment hot water pump 6, one end of which is connected to one end of the evaporator assembly 28, the other end of which is connected to the third valve port 53 of the fourth three-way valve 5, and the other end of the evaporator assembly 28 is connected to the third valve port 93 of the seventh three-way valve 9.

[0048] In practical applications, the second valve port 52 and the third valve port 53 of the fourth three-way valve 5 are opened, and the first valve port 51 is closed; the second valve port 92 and the third valve port 93 of the seventh three-way valve 9 are opened, and the first valve port 91 is closed; the crew compartment hot water pump 6 is opened, so that the motor control assembly 27, the fourth three-way valve 5, the crew compartment hot water pump 6, the evaporator assembly 28 and the seventh three-way valve 9 constitute the fourth heat dissipation circulation water circuit.

[0049] Specifically, the hot water pump 6 in the passenger compartment can drive the coolant through the motor and electronic control assembly 27. The coolant can absorb the heat generated by the motor and electronic control assembly 27, and then the coolant can pass through the evaporator assembly 28. The evaporator assembly 28 can use the heat carried by the coolant to heat the passenger compartment and meet the heating needs of the passenger compartment.

[0050] It should be understood that, during the process of converting the heat generated by the motor control component 27 into hydrothermal heat to provide heating heat to the evaporator assembly 28, the coolant does not pass through the water radiator 29, thus avoiding the water radiator 29 absorbing some of the heat. All the heat generated by the motor control component 27 is used to heat the passenger compartment, thereby achieving the effect of making full use of the heat generated by the motor control component 27 and effectively reducing heat waste.

[0051] In one embodiment, Figure 2 This is a schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application. When the ambient temperature of the construction machinery is lower than a preset temperature value (which can be set according to actual conditions, for example, a preset temperature value of 5°C), the battery pack 26 cannot be within its optimal operating temperature range, and the battery pack 26 requires heating. In this case, such as Figure 2As shown, the first cooling circulation water path is connected (the connection process can be referred to the above description) and the second cooling circulation water path is connected (the connection process can be referred to the above description). In this way, the heat generated by the hydraulic device 24 and the motor control assembly 27 can be fully utilized. Specifically, the coolant will not pass through the oil radiator 30 and the water radiator 29, thus avoiding the oil radiator 30 and the water radiator 29 absorbing some heat. All the heat generated by the hydraulic device 24 and the motor control assembly 27 is used to heat the battery pack 26, thereby achieving the effect of fully utilizing the heat generated by the motor control assembly 27 and the hydraulic device 24, effectively reducing heat waste.

[0052] In one embodiment, Figure 3 This is a schematic diagram of a waste heat recovery system provided as another exemplary embodiment of this application. When the ambient temperature of the construction machinery is lower than a preset temperature value (which can be set according to actual conditions, for example, a preset temperature value of 5°C), the crew compartment has a heating requirement. In this case, such as Figure 3 As shown, both the third and fourth cooling circulation channels are connected. This allows for full utilization of the heat generated by the hydraulic system 24 and the motor control assembly 27. Specifically, the coolant does not pass through the oil radiator 30 and water radiator 29, preventing these radiators from absorbing heat. All the heat generated by the motor control assembly 27 and the hydraulic system 24 is used to heat the passenger compartment, thus achieving full utilization of the heat generated by these components and effectively reducing heat waste.

[0053] In one embodiment, Figure 4 This is a schematic diagram of a waste heat recovery system provided for another exemplary embodiment of this application. When the ambient temperature of the construction machinery is lower than a preset temperature value (which can be set according to actual conditions, for example, a preset temperature value of 5°C), the battery pack 26 cannot be within its optimal operating temperature range, and the battery pack 26 requires heating. Simultaneously, the passenger compartment also requires heating. In this situation, such as... Figure 4 As shown, the first heat dissipation circulation water path is connected, and the heat generated by the hydraulic device 24 is used to heat the battery pack 26. All the heat generated by the hydraulic device 24 is used to heat the battery pack 26; as shown Figure 4 The fourth heat dissipation circulation water channel is connected, and the heat generated by the motor and electronic control component 27 is used to heat the passenger compartment. All the heat generated by the motor and electronic control component 27 is used to heat the passenger compartment.

[0054] In one embodiment, when the ambient temperature of the construction machinery is lower than a preset temperature value (which can be set according to actual conditions, for example, a preset temperature value of 5°C), the battery pack 26 cannot be within the optimal operating temperature range, and the battery pack 26 requires heating. Simultaneously, the passenger compartment also requires heating. Alternatively, the battery pack 26 can be heated by connecting the second heat dissipation circulation water circuit and utilizing the heat generated by the motor and electronic control components 27; and the passenger compartment can be heated by connecting the third water circulation loop and utilizing the heat generated by the hydraulic device 24.

[0055] Figure 5 A schematic diagram of a waste heat recovery system provided as another exemplary embodiment of this application. (See diagram below.) Figure 1 and Figure 5 As shown, the waste heat recovery system 100 may also include a first expansion valve 7, a first condenser 32, and a passenger compartment refrigeration compressor 8. One end of the first expansion valve 7 is connected to the evaporator assembly 28, one end of the first condenser 32 is connected to the other end of the first expansion valve 7, and the two ends of the passenger compartment refrigeration compressor 8 are connected to the evaporator assembly 28 and the first condenser 32, respectively.

[0056] Specifically, the evaporator assembly 28, the first expansion valve 7, the first condenser 32, and the passenger compartment refrigeration compressor 8 can form a first refrigerant circulation loop. The first expansion valve 7 can adjust the flow rate of refrigerant in the first refrigerant circulation loop according to the actual situation to avoid the refrigerant from accumulating in the pipe and causing the pipe to burst.

[0057] like Figure 5 As shown, when the ambient temperature is high, there is a cooling demand in the passenger compartment, which connects the first refrigerant circulation loop. The passenger compartment refrigeration compressor 8 drives the refrigerant through the first condenser 32. The first condenser 32 cools the refrigerant, and then the refrigerant can pass through the evaporator assembly 28. The evaporator assembly 28 uses the refrigerant to cool the passenger compartment and meet the cooling demand in the passenger compartment.

[0058] like Figure 1 and Figure 5 As shown, the waste heat recovery system 100 may further include a battery circuit water pump 2, a second heat exchanger 31, a fifth shut-off valve 11, a battery cooling compressor 1, a second condenser 33, and a second expansion valve 12. One end of the battery circuit water pump 2 is connected to the battery pack 26, one end of the second heat exchanger 31 is connected to the other end of the battery circuit water pump 2, the two ends of the fifth shut-off valve 11 are respectively connected to the second heat exchanger 31 and the battery pack 26, one end of the battery cooling compressor 1 is connected to the second heat exchanger 31, one end of the second condenser is connected to the other end of the battery cooling compressor 1, and the two ends of the second expansion valve 12 are respectively connected to the second condenser 33 and the second heat exchanger 31.

[0059] Specifically, the battery cooling compressor 1, the second condenser 33, the second expansion valve 12, and the second heat exchanger 31 can form a second refrigerant circulation loop. The second expansion valve 12 can adjust the flow rate of the refrigerant in the second refrigerant circulation loop according to the actual situation to avoid the refrigerant from accumulating in the pipe and causing the pipe to burst.

[0060] Specifically, the battery-powered water pump 2, the second heat exchanger 31, the fifth shut-off valve 11, and the battery pack 26 can constitute the fifth heat dissipation circulating water circuit. For example... Figure 5 As shown, when the ambient temperature is high, the battery pack 26 operates at a high temperature. The control battery circuit water pump 2 is turned on, and the fifth shut-off valve 11 is closed. The coolant passing through the battery pack 26 carries a large amount of heat and then passes through the second heat exchanger 31. The refrigerant in the second heat exchanger 31 (running in the second refrigerant circulation loop) can exchange heat with the coolant, which can reduce the temperature of the hydraulic oil. The coolant output from the second heat exchanger 31 can pass through the battery pack 26 again.

[0061] In one embodiment, the second heat exchanger 31 may include a tubular heat exchanger, a plate tube heat exchanger, etc.

[0062] like Figure 5 As shown, when the ambient temperature is high, it is necessary to dissipate heat from the motor control component 27. This is achieved by closing the second valve port 302 and the third valve port 303 of the third three-way valve 3, and opening the first valve port 301; closing the first valve port 51 and the second valve port 52 of the fourth three-way valve 5, and opening the third valve port 53; closing the first valve port 91 and the second valve port 92 of the seventh three-way valve 9, and closing the third valve port 93; and closing the second valve port 102 and the third valve port 103 of the sixth three-way valve 10, and opening the first valve port 101. In this way, the water radiator 29 can be used to cool the coolant, and the cooled coolant can then be used to dissipate heat from the motor control component 27.

[0063] like Figure 5 As shown, when the ambient temperature is high, heat dissipation is required for the battery pack 26. This is achieved by closing the first valve port 171 and the second valve port 172 of the first three-way valve 17, and opening the third valve port 173. Similarly, the second valve port 182 and the third valve port 183 of the second three-way valve 18 are closed, while the first valve port 181 is opened. This allows the oil cooler 30 to cool the coolant, which in turn cools the battery pack 26.

[0064] like Figure 1As shown, the waste heat recovery system 100 may further include a third shut-off valve 20 and a fourth shut-off valve 22. The two ends of the third shut-off valve 20 are connected to the battery pack 26 and the first heat exchanger 25, respectively, and the two ends of the fourth shut-off valve 22 are connected to the battery pack 26 and the oil-dissipating system water pump 19, respectively. The third shut-off valve 20 can control the connection or disconnection between the battery pack 26 and the first heat exchanger 25, and the fourth shut-off valve 22 can control the connection or disconnection between the battery pack 26 and the oil-dissipating system water pump 19.

[0065] In practical applications, when it is necessary to connect the third heat dissipation circulation water circuit (the connection conditions can be referred to the previous introduction), the third shut-off valve 20 can be controlled to connect the battery pack 26 and the first heat exchanger 25, and the fourth shut-off valve 22 can be controlled to connect the battery pack 26 and the oil evaporation system water pump 19.

[0066] like Figure 1 As shown, the waste heat recovery system 100 may also include a first fan 13, which is arranged opposite to the second condenser 33. The first fan 13 can improve the condensation rate of the second condenser 33.

[0067] like Figure 1 As shown, the water radiator 29 and the oil radiator 30 are arranged side by side. The waste heat recovery system 100 may also include a second fan 14, which can improve the heat dissipation rate of the water radiator 29 and the oil radiator 30.

[0068] like Figure 1 As shown, the waste heat recovery system 100 may also include a third fan 15, which is disposed opposite to the evaporator assembly 28. The third fan 15 can accelerate the airflow rate near the evaporator assembly 28, thereby improving the working efficiency of the evaporator assembly 28.

[0069] like Figure 1 As shown, the waste heat recovery system 100 may also include a fourth fan 16, which is arranged opposite to the first condenser 32. The fourth fan 16 can improve the condensation rate of the first condenser 32.

[0070] Figure 6 This is a schematic flowchart of a waste heat recovery method provided for an exemplary embodiment of this application. Figure 6 As shown, the waste heat recovery method provided in this application embodiment can be applied to the waste heat recovery system described in the foregoing embodiments. The waste heat recovery control method includes: S810: Controls the first and third valve ports of the first three-way valve to open, and the second valve port to close.

[0071] S820: Controls the first and second valve ports of the second three-way valve to open and the third valve port to close, so that the hydraulic device, the second three-way valve, the first three-way valve, and the first heat exchanger constitute the first oil circulation loop.

[0072] S830: Controls the oil-dissipation system water pump to open, so that the first heat exchanger, the oil-dissipation system water pump, and the battery pack form the first heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat to heat the battery pack.

[0073] The waste heat recovery method provided in this application embodiment controls the oil radiator system water pump 19 to open, so that the first heat exchanger 25, the oil radiator system water pump 19, and the battery pack 26 form a first heat dissipation circulation water path. This converts the oil heat generated by the hydraulic device 24 into water heat, which is then used to heat the battery pack 26. When utilizing the heat generated by the hydraulic device 24 during operation, the coolant does not pass through the oil radiator 30, thus avoiding the oil radiator 30 absorbing some of the heat. All the heat generated by the hydraulic device 24 is used to heat the battery pack 26, thereby achieving the effect of fully utilizing the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0074] Figure 7 A schematic flowchart of a waste heat recovery method provided as another exemplary embodiment of this application. Figure 7 As shown, the waste heat recovery method may further include: S840: Controls the first and second valve ports of the fourth three-way valve to open, and the third valve port to close.

[0075] S850: Controls the first and third valve ports of the third three-way valve to open, and the second valve port to close.

[0076] S860: Controls the first and third valve ports of the sixth three-way valve to open, and the second valve port to close.

[0077] S870: Controls the first and second valve ports of the seventh three-way valve to open, and the third valve port to close.

[0078] S880: Controls the motor-controlled water pump to open, so that the motor control component, the seventh three-way valve, the sixth three-way valve, the battery pack, the third three-way valve, the motor-controlled water pump, and the fourth three-way valve form a second heat dissipation circulation water circuit, so as to convert the heat generated by the motor control component into water heat to heat the battery pack.

[0079] It should be understood that after the heat generated by the motor control component 27 is converted into hydrothermal heat, the coolant will not pass through the water radiator 29 during the process of heating the battery pack 26, thus avoiding the water radiator 29 absorbing some of the heat. All the heat generated by the motor control component 27 is used to heat the battery pack 26, thereby achieving the effect of making full use of the heat generated by the motor control component 27 and effectively reducing heat waste.

[0080] In one embodiment, steps S840, S850, S860, S870, and S880 may be executed after step S830 or before S810.

[0081] Figure 8 A schematic flowchart of a waste heat recovery method provided as another exemplary embodiment of this application. Figure 8 As shown, the waste heat recovery method also includes: S890: Controls the opening of the first and second shut-off valves.

[0082] S900: Controls the oil-dissipating system water pump to open, so that the first heat exchanger, the oil-dissipating system water pump, the first shut-off valve, the evaporator assembly and the second shut-off valve form a third heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat and provide heating heat to the evaporator assembly.

[0083] It should be understood that, after the oil heat generated by the hydraulic device 24 is converted into water heat, the coolant will not pass through the oil radiator 30 during the process of providing heating heat to the evaporator assembly 28. This avoids the water-oil radiator 30 absorbing some of the heat, and all the heat generated by the hydraulic device 24 is used to heat the crew compartment, thereby achieving the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0084] In one embodiment, steps S890 and S900 can be executed after step S880 or before step S840.

[0085] Figure 9 A schematic flowchart of a waste heat recovery method provided as another exemplary embodiment of this application. Figure 9 As shown, the waste heat recovery method also includes: S910: Controls the second and third valve ports of the fourth three-way valve to open, and the first valve port to close.

[0086] S920: Controls the second and third valve ports of the seventh three-way valve to open, and the first valve port to close.

[0087] S930: Controls the opening of the crew compartment hot water pump, so that the motor control assembly, the fourth three-way valve, the crew compartment hot water pump, the evaporator assembly, and the seventh three-way valve form the fourth heat dissipation circulation water circuit, so as to convert the heat generated by the motor control assembly into water heat and provide heating heat to the evaporator assembly.

[0088] It should be understood that, during the process of converting the heat generated by the motor control component 27 into hydrothermal heat to provide heating heat to the evaporator assembly 28, the coolant does not pass through the water radiator 29, thus avoiding the water radiator 29 absorbing some of the heat. All the heat generated by the motor control component 27 is used to heat the passenger compartment, thereby achieving the effect of making full use of the heat generated by the motor control component 27 and effectively reducing heat waste.

[0089] In one embodiment, steps S910, S920, and S930 may be executed after step S900 or before step S890.

[0090] This application also provides an engineering machinery that includes the aforementioned waste heat recovery system 100 and possesses all the functions of the waste heat recovery system 100. The beneficial effects of this engineering machinery can be referenced from the beneficial effects of the aforementioned waste heat recovery system 100.

[0091] In one embodiment, the construction machinery may include excavators, cranes, etc.

[0092] The basic principles of this application have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in this application are merely examples and not limitations, and should not be considered as essential features of each embodiment of this application. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the application to the necessity of employing the aforementioned specific details for implementation.

[0093] The block diagrams of devices, apparatuses, devices, and systems involved in this application are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0094] It should also be noted that in the apparatus, equipment, and methods of this application, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered as equivalent solutions of this application.

[0095] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use this application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of this application. Therefore, this application is not intended to be limited to the aspects shown herein, but rather to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0096] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of this application to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A waste heat recovery system, characterized in that, include: Hydraulic device (24); The first three-way valve (17) has its first valve port (171) connected to one end of the hydraulic device (24); The second three-way valve (18) has its second valve port (182) connected to the other end of the hydraulic device (24); The first heat exchanger (25) has two ends connected to the third valve port (173) of the first three-way valve (17) and the first valve port (181) of the second three-way valve (18), respectively. Oil radiator (30), the two ends of which are connected to the second valve port (172) of the first three-way valve (17) and the third valve port (183) of the second three-way valve (18), respectively; An oil-dissipation system water pump (19) is provided, one end of which is connected to the first heat exchanger (25). The battery pack (26) has two ends connected to the other end of the oil-dissipating system water pump (19) and the first heat exchanger (25), respectively. The third three-way valve (3) has its first valve port (301) connected to one end of the battery pack (26); Electric motor-controlled water pump (4), one end of which is connected to the third valve port (303) of the third three-way valve (3); The fourth three-way valve (5) has its first valve port (51) connected to the other end of the electric motor-controlled water pump (4); The sixth three-way valve (10) has its first valve port (101) connected to one end of the battery pack (26); The seventh three-way valve (9) has its first valve port (91) connected to the third valve port (103) of the sixth three-way valve (10); A water radiator (29), the two ends of which are respectively connected to the second valve port (102) of the sixth three-way valve (10) and the second valve port (302) of the third three-way valve (3); and The motor control assembly (27) has two ends connected to the second valve port (52) of the fourth three-way valve (5) and the second valve port (92) of the seventh three-way valve (9), respectively. Evaporator assembly (28); The first shut-off valve (21) is connected to the first heat exchanger (25) and the evaporator assembly (28) at both ends. The second shut-off valve (23) has one end connected to the evaporator assembly (28) and the other end connected to the oil distribution system water pump (19). The crew compartment hot water pump (6) is connected at one end to one end of the evaporator assembly (28), and at the other end to the third valve port (53) of the fourth three-way valve (5). The other end of the evaporator assembly (28) is connected to the third valve port (93) of the seventh three-way valve (9). A first expansion valve (7) is connected at one end to the evaporator assembly (28); The first condenser (32) has one end connected to the other end of the first expansion valve (7); The crew cabin refrigeration compressor (8) is connected at both ends to the evaporator assembly (28) and the first condenser (32), respectively. The hydraulic device (24), the second three-way valve (18), the first three-way valve (17), and the first heat exchanger (25) constitute the first oil circulation loop. The first heat exchanger (25), the oil evaporator system water pump (19), and the battery pack (26) constitute the first heat dissipation circulation water circuit. The first heat exchanger (25), the oil dissipation system water pump (19), the first shut-off valve (21), the evaporator assembly (28), and the second shut-off valve (23) constitute the third heat dissipation circulation water circuit. Among them, the motor control assembly (27), the fourth three-way valve (5), the crew cabin hot water pump (6), the evaporator assembly (28), and the seventh three-way valve (9) constitute the fourth heat dissipation circulation water circuit; The evaporator assembly (28), the first expansion valve (7), the first condenser (32), and the crew cabin refrigeration compressor (8) constitute the first refrigerant circulation loop.

2. The waste heat recovery system according to claim 1, characterized in that, The waste heat recovery system also includes: The third shut-off valve (20) is connected at both ends to the battery pack (26) and the first heat exchanger (25), respectively. The fourth shut-off valve (22) is connected at both ends to the battery pack (26) and the oil dispersing system water pump (19), respectively.

3. The waste heat recovery system according to claim 1, characterized in that, The waste heat recovery system also includes: A battery-powered water pump (2), one end of which is connected to the battery pack (26); The second heat exchanger (31) has one end connected to the other end of the battery circuit water pump (2); The fifth shut-off valve (11) is connected to the second heat exchanger (31) and the battery pack (26) at both ends. A battery cooling compressor (1), one end of which is connected to the second heat exchanger (31); The second condenser (33) has one end connected to the other end of the battery cooling compressor (1); The second expansion valve (12) is connected to the second condenser (33) and the second heat exchanger (31) at both ends.

4. A waste heat recovery control method, applied to a waste heat recovery system as described in any one of claims 1 to 3, characterized in that, The waste heat recovery control method includes: The first and third valve ports of the first three-way valve are opened, and the second valve port is closed. The first and second valve ports of the second three-way valve are opened, and the third valve port is closed, so that the hydraulic device, the second three-way valve, the first three-way valve, and the first heat exchanger constitute a first oil circulation loop. The oil-dissipation system water pump is turned on so that the first heat exchanger, the oil-dissipation system water pump, and the battery pack form a first heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat and then heat the battery pack.

5. The waste heat recovery control method according to claim 4, characterized in that, The waste heat recovery control method further includes: The first and second valve ports of the fourth three-way valve are opened, and the third valve port is closed. The first and third valve ports of the third three-way valve are opened, and the second valve port is closed. The first and third valve ports of the sixth three-way valve are opened, and the second valve port is closed. The first and second valve ports of the seventh three-way valve are opened, and the third valve port is closed. The motor-controlled water pump is turned on so that the motor-controlled component, the seventh three-way valve, the sixth three-way valve, the battery pack, the third three-way valve, the motor-controlled water pump, and the fourth three-way valve form a second heat dissipation circulation water circuit, so as to convert the heat generated by the motor-controlled component into water heat and then heat the battery pack.

6. The waste heat recovery control method according to claim 5, characterized in that, The waste heat recovery control method further includes: Control the opening of the first and second shut-off valves; The oil-dissipating system water pump is turned on so that the first heat exchanger, the oil-dissipating system water pump, the first shut-off valve, the evaporator assembly, and the second shut-off valve form a third heat dissipation circulation water circuit, so as to convert the oil heat generated by the hydraulic device into water heat and provide heating heat to the evaporator assembly.

7. The waste heat recovery control method according to claim 6, characterized in that, The waste heat recovery control method further includes: The second and third valve ports of the fourth three-way valve are opened, and the first valve port is closed. The second and third valve ports of the seventh three-way valve are opened, and the first valve port is closed. The crew compartment hot water pump is turned on so that the motor control assembly, the fourth three-way valve, the crew compartment hot water pump, the evaporator assembly, and the seventh three-way valve form a fourth heat dissipation circulation water circuit, so that the heat generated by the motor control assembly is converted into hydrothermal heat and then provides heating heat to the evaporator assembly.

8. An engineering machinery, characterized in that, include: The waste heat recovery system as described in any one of claims 1 to 3.

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