SYSTEM AND METHOD FOR RECOVERING WASTE HEAT AND CONSTRUCTION MACHINERY

Abstract

The present application relates to a waste heat recovery system, a method, and 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 cooling system water pump, and a battery pack. A first valve port of the first three-way valve is communicated with one end of the hydraulic device, and a second valve port of the second three-way valve is communicated with the other end of the hydraulic device; the two ends of the first heat exchanger are respectively communicated with a third valve port of the first three-way valve and a first valve port of the second three-way valve; the two ends of the oil radiator are respectively communicated with a second valve port of the first three-way valve and a third valve port of the second three-way valve; one end of the oil cooling system water pump is connected to the first heat exchanger; and the two ends of the battery pack are respectively communicated with the other end of the oil cooling system water pump and the first heat exchanger.

Description

1 / 27 “SYSTEM AND METHOD FOR RECOVERING WASTE HEAT AND CONSTRUCTION MACHINERY” CROSS-REFERENCE TO RELATED REQUESTS

[0001] This application claims priority to Chinese Patent Application No. 202311819524.9 filed on December 26, 2023, which is incorporated herein by reference in its entirety. FIELD OF TECHNIQUE

[0002] This application relates to the field of construction machinery technology and, in particular, to a system and method for waste heat recovery in construction machinery. BACKGROUND

[0003] Currently, in the operation of construction machinery, the heat generated by a hydraulic device during operation is usually distributed to the air through a radiator. In case of low ambient temperature, a battery needs to be heated, usually with heat generated by an electric heating device, which can cause a waste of heat generated by the hydraulic device and can also increase the energy consumption of a vehicle due to the use of the electric heating device. By means of a waste heat recovery system in the related technique, the heat generated by the hydraulic device can be used to heat a battery pack to achieve the goal of adequately reducing heat waste.However, according to the waste heat recovery system in the related technique, while the battery pack is heated with the heat generated by the hydraulic device, the coolant carrying heat may pass through the radiator which may absorb some of the heat, so that the heat generated by the hydraulic device cannot be fully utilized, resulting in wasted heat. SUMMARY

[0004] In order to solve the above technical problems, embodiments of the present application provide a system and method for recovering waste heat and construction machinery, which can make full use of the heat generated by a hydraulic device during operation, so as to reduce heat waste.

[0005] In a first aspect, a system is provided of Petition 870240105007, dated 09 / 12 / 2024, page 8 / 48 2 / 27 waste heat recovery. The waste heat recovery system includes: a hydraulic device; a first three-way valve, a first valve port of the first three-way valve communicating with one end of the hydraulic device; a second three-way valve, a second valve port of the second three-way valve communicating with the other end of the hydraulic device; a first heat exchanger, two ends of the first heat exchanger communicating with a third valve port of the first three-way valve and a first valve port of the second three-way valve, respectively; an oil radiator, with two ends of the oil radiator connected to a second valve port of the first three-way valve and to a third valve port of the second three-way valve, respectively; a water pump for the oil radiator system, one end of the water pump being connected to the first heat exchanger; and a battery pack, two ends of the battery pack communicating with the other end of the oil radiator system, the water pump, and the first heat exchanger, respectively.

[0006] According to the first aspect of this application, the waste heat recovery system additionally includes: a third three-way valve, a first port of the third three-way valve communicating with one end of the battery pack; an electronically controlled water pump driven by a motor, one end of the electronically controlled water pump driven by a motor communicating with a third valve port of the three-way valve; a fourth three-way valve, a first port of the fourth three-way valve communicating with the other end of the electronically controlled motor-driven water pump; a fifth three-way valve, a first valve port of the Petition 870240105007, dated 09 / 12 / 2024, p. 9 / 48 3 / 27 fifth three-way valve communicating with the other end of the battery pack; u a sixth three-way valve, u a first valve port of the sixth three-way valve communicating with a third valve port of the fifth three-way valve; a water radiator, with two ends of the water radiator communicating with a second valve port of the fifth three-way valve and a second valve port of the third three-way valve, respectively; and an electronic engine control assembly, with two ends of the electronic engine control assembly communicating with a second valve port of the fourth three-way valve and a second valve port of the sixth three-way valve, respectively.

[0007] According to the first aspect of this application, the waste heat recovery system additionally includes: an evaporator assembly; a first regulating valve, with two ends of the first regulating valve communicating with the first heat exchanger and the evaporator assembly, respectively; and a second regulating valve, with one end of the second regulating valve communicating with the evaporator assembly, and the other end of the second regulating valve communicating with the water pump of the oil radiator system.

[0008] According to the first aspect of this application, the waste heat recovery system additionally includes: a crew cabin heating water pump, one end of the crew cabin heating water pump communicating with one end of the evaporator assembly, the other end of the crew cabin heating water pump communicating with a third valve port of the fourth three-way valve, and the other end of the evaporator assembly communicating with a third valve port of the sixth three-way valve.

[0009] According to the first aspect of this application, the waste heat recovery system additionally includes: Petition 870240105007, dated 09 / 12 / 2024, page 10 / 48 4 / 27 a first expansion valve, one end of the first expansion valve communicating with the evaporator assembly; a first condenser, one end of the first condenser communicating with the other end of the first expansion valve; and a crew cabin refrigeration compressor, two ends of the crew cabin refrigeration compressor communicating with the evaporator assembly and the first condenser, respectively.

[0010] According to the first aspect of this application, the waste heat recovery system additionally includes: a third regulating valve, with two ends of the third regulating valve communicating with the battery pack and the first heat exchanger, respectively; and a fourth regulating valve, with two ends of the fourth regulating valve communicating with the battery pack and the water pump of the oil radiator system, respectively.

[0011] According to the first aspect of this application, the waste heat recovery system additionally includes: a battery-powered water pump, one end of the battery-powered water pump communicating with the battery pack; a second heat exchanger, one end of the second heat exchanger communicating with the other end of the battery-powered water pump; a fifth regulating valve, with two ends of the fifth regulating valve communicating with the second heat exchanger and the battery assembly, respectively; a battery cooling compressor, one end of the battery cooling compressor communicating with the second heat exchanger; a second condenser, one end of the second condenser communicating with the other end of the cooling compressor of the battery; and a second expansion valve, two ends of the second expansion valve communicating with the second condenser and the second heat exchanger, respectively. Petition 870240105007, dated 09 / 12 / 2024, page 11 / 48 5 / 27

[0012] In a second aspect, a waste heat recovery method is additionally provided. The method is applied to the waste heat recovery system as described in the previous embodiment, and the waste heat recovery method includes: To control the first valve gate and the third valve gate of the first three-way valve to open, and the second valve gate of the first three-way valve to close; To control the first valve port and the second valve port of the second three-way valve to open and the third valve port of the second three-way valve to close, so that the hydraulic device, the second three-way valve, the first three-way valve, and the first heat exchanger form a first oil circulation circuit; and to control the water pump of the oil radiator system to turn on, so that the first heat exchanger, the water pump of the oil radiator system, and the battery pack form a first heat dissipation circulation circuit to heat the battery pack after converting the oil heat generated by the hydraulic device into water heat.

[0013] According to the second aspect of this application, the waste heat recovery system additionally includes: a third three-way valve, a first port of the third three-way valve communicating with one end of the battery pack; an electronically controlled water pump driven by a motor, one end of the electronically controlled water pump driven by a motor communicating with a third valve port of the three-way valve; a fourth three-way valve, a first port of the fourth three-way valve communicating with the other end of the electronically controlled motor-driven water pump; a fifth three-way valve, a first port of the fifth three-way valve communicating with the other end of the battery assembly; a sixth three-way valve, a first valve port of the sixth three-way valve communicating with a third valve port of the fifth Petition 870240105007, dated 09 / 12 / 2024, p. 12 / 48 6 / 27 three-way valve; a water radiator, with two ends of the water radiator communicating with a second valve port of the fifth three-way valve and a second valve port of the third three-way valve, respectively; and an electronic engine control assembly, with two ends of the electronic engine control assembly communicating with a second valve port of the fourth three-way valve and a second valve port of the sixth three-way valve, respectively, wherein the method of waste heat recovery additionally includes: To control the first valve gate and the second valve gate of the fourth three-way valve to open, and the third valve gate of the fourth three-way valve to close; To control the first valve gate and the third valve gate of the three-way valve to open, and the second valve gate of the three-way valve to close; To control the first valve gate and the third valve gate of the fifth three-way valve to open, and the second valve gate of the fifth three-way valve to close; to control the first valve port and the second valve port of the sixth three-way valve to open and a third valve port of the sixth three-way valve to close; and to control the electronically controlled motor-driven water pump to turn on, so that the electronic motor control assembly, the sixth three-way valve, the fifth three-way valve, the battery assembly, the third three-way valve, the electronically controlled motor-driven water pump, and the fourth three-way valve form a second heat dissipation circulation circuit to heat the battery assembly after converting the heat generated by the electronic motor control assembly into water heat.

[0014] According to the second aspect of this application, the waste heat recovery system additionally includes: an evaporator assembly; a first regulating valve, two ends of the first Petition 870240105007, dated 09 / 12 / 2024, p. 13 / 48 7 / 27 regulating valve communicating with the first heat exchanger and the evaporator assembly, respectively; and a second regulating valve, one end of the second regulating valve communicating with the evaporator assembly, and the other end of the second regulating valve communicating with the water pump of the oil radiator system; where the waste heat recovery method additionally includes: to control the first regulating valve and the second regulating valve to be open; and to control the oil radiator system water pump to be switched on, so that the first heat exchanger, the oil radiator system water pump, the first regulating valve, the evaporator assembly and the second regulating valve form a third heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the oil heat generated by the hydraulic device into water heat.

[0015] According to the second aspect of this application, the waste heat recovery system additionally includes: a crew cabin heating water pump, one end of the crew cabin heating water pump communicating with one end of the evaporator assembly, the other end of the crew cabin heating water pump communicating with the third port of the fourth three-way valve, and the other end of the evaporator assembly communicating with the third port of the sixth three-way valve, wherein the waste heat recovery method additionally includes: To control the second valve gate and the third valve gate of the fourth three-way valve to open, and the first valve gate of the fourth three-way valve to close; to control the second valve gate and the third valve gate of the sixth three-way valve to open and the first valve gate of the sixth three-way valve to close; and Petition 870240105007, dated 09 / 12 / 2024, page 14 / 48 8 / 27 control the crew cabin heating water pump to be switched on, so that the engine electronic control assembly, the fourth three-way valve, the crew cabin heating water pump, the evaporator assembly and the sixth three-way valve form a fourth heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the heat generated by the engine electronic control assembly into water heat.

[0016] In a third aspect, construction machinery is additionally supplied. Construction machinery includes: the waste heat recovery system as described in the previous embodiments.

[0017] According to the waste heat recovery system and method, and the construction machinery supplied in the embodiments of this application, controlling the oil radiator system water pump to be switched on, the first heat exchanger, the oil radiator system water pump and the battery assembly form the first water circulation circuit for heat dissipation, so as to heat the battery assembly after converting the oil heat generated by the hydraulic device into water heat. During the use of the heat generated by the hydraulic device, the coolant does not pass through the oil radiator, to prevent the oil radiator from absorbing part of the heat, and all the heat generated by the hydraulic device is used to heat the battery assembly, which thus achieves the effect of making full use of the heat generated by the hydraulic device and effectively reducing heat waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of this application will become more apparent when describing embodiments of this application in more detail with reference to the accompanying drawings. The accompanying drawings, which are intended to provide a further understanding of the embodiments of this application and form a part of the descriptive report, serve to explain this application together with the embodiments of this application, and do not constitute a limitation to this application. In the figures, the same reference number generally represents the same part or step. Petition 870240105007, dated 09 / 12 / 2024, page 15 / 48 9 / 27

[0019] Figure 1 is a schematic diagram of a waste heat recovery system according to an exemplary embodiment of the present application.

[0020] Figure 2 is a schematic diagram of a waste heat recovery system according to another exemplary embodiment of the present application.

[0021] Figure 3 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application.

[0022] Figure 4 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application.

[0023] Figure 5 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application.

[0024] Figure 6 is a schematic flow diagram of a waste heat recovery method according to an exemplary embodiment of the present application.

[0025] Figure 7 is a schematic flow diagram of a waste heat recovery method according to another exemplary embodiment of the present application.

[0026] Figure 8 is a schematic flow diagram of a waste heat recovery method according to yet another exemplary embodiment of the present application.

[0027] Figure 9 is a schematic flow diagram of a waste heat recovery method according to yet another exemplary embodiment of the present application.

[0028] Reference numbers: 100-Waste heat recovery system; 1-Battery cooling compressor; 2-Battery water pump; 3-Third three-way valve; 4-Electronically controlled water pump; 5-Fourth three-way valve; 6-Crew cabin heating water pump; 7-First expansion valve; 8-Crew cabin refrigeration compressor; 9-Sixth three-way valve; 10-Fifth three-way valve; 11-Fifth regulating valve; 12-Second valve of Petition 870240105007, dated 09 / 12 / 2024, page 16 / 48 10 / 27 Expansion; 13-First fan; 14-Second fan; 15-Third fan; 16-Fourth fan; 17-First three-way valve; 18-Second three-way valve; 19-Water pump of the oil radiator system; 20-Third regulating valve; 21-First regulating valve; 22-Fourth regulating valve; 23-Second regulating valve; 24-Hydraulic device; 24-Operating device; 24-Oil pump; 25-First heat exchanger; 26-Battery assembly; 27-Electronic engine control assembly; 28-Evaporator assembly; 29-Water radiator; 30-Oil radiator; 31-Second heat exchanger; 32-First condenser; and 33 - Second capacitor. DESCRIPTION OF MODALITIES

[0029] Exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. Apparently, the embodiments described are only part of the embodiments of the present application, rather than all the embodiments of the present application, and it should be understood that the present application is not limited to the exemplary embodiments described herein.

[0030] Figure 1 is a schematic diagram of a waste heat recovery system according to an exemplary embodiment of the present application. As shown in Figure 1, the waste heat recovery system 100 provided by the embodiment of the present application may include a hydraulic device 24. In practical application, the hydraulic device 24 can be used to assist in performing different operations, such as a walking operation and a lifting operation.

[0031] As shown in Figure 1, the hydraulic device 24 may include an operating device 241 and an oil pump 242. The oil pump 242 may actuate the hydraulic oil to move to the operating device 241 and then assist the operating device 241 in performing the corresponding operations.

[0032] As shown in Figure 1, the waste heat recovery system 100 may additionally include a first three-way valve 17, a second three-way valve 18, a first heat exchanger 25, an oil radiator 30, an oil radiator system water pump 19 and a battery pack 26, with a first valve port 171 of the first three-way valve 17 communicating with one end of the device. Petition 870240105007, dated 09 / 12 / 2024, page 17 / 48 11 / 27 hydraulic 24, a second valve port 182 of the second three-way valve 18 communicating with the other end of the hydraulic device 24, two ends of the first heat exchanger 25 communicating with a third valve port 173 of the first three-way valve 17 and a first valve port 181 of the second three-way valve 18, respectively, two ends of the oil radiator 30 being connected to a second valve port 172 of the first three-way valve 17 and to a third valve port 183 of the second three-way valve 18, respectively, one end of the water pump of the oil radiator system 19 being connected to the first heat exchanger 25, and two ends of the battery assembly 26 communicating with the other end of the water pump of the oil radiator system 19 and the first heat exchanger 25, respectively.

[0033] In practical application, by controlling the first gate of valve 171 and the third gate of valve 173 of the first three-way valve 17 to be open and the second gate of valve 172 to be closed, and by controlling the first gate of valve 181 and the second gate of valve 182 of the second three-way valve 18 to be open and the third gate of valve 183 to be closed, the hydraulic device 24, the second three-way valve 18, the first three-way valve 17 and the first heat exchanger 25 can form a first oil circulation circuit.

[0034] In one embodiment, the hydraulic oil exiting the oil pump passes through the hydraulic device 24, the hydraulic device 24 performs corresponding operations, the hydraulic oil generates heat, and the temperature of the hydraulic oil exiting the hydraulic device 24 is relatively high; and the hydraulic oil exiting the hydraulic device 24 passes through the first heat exchanger 25, the coolant in the first heat exchanger 25 and the hydraulic oil can exchange heat to reduce the temperature of the hydraulic oil, and the hydraulic oil exiting the first heat exchanger 25 can return to the hydraulic device 24 again.

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

[0036] As shown in Figure 1, battery pack 26 can supply electrical power to electrical components in construction machinery. It should be understood that, in the case of low ambient temperature, the Petition 870240105007, dated 09 / 12 / 2024, page 18 / 48 The 12 / 27 battery pack 26 needs to be heated in order to ensure that the battery pack 26 is at the ideal operating temperature.

[0037] Specifically, by controlling the water pump of the oil radiator system 19 to be switched on, the first heat exchanger 25, the water pump of the oil radiator system 19 and the battery assembly 26 can form a first heat dissipation circulation circuit. In this way, the hydraulic oil outlet of the hydraulic device 24 is fed into the first heat exchanger 25, the hydraulic oil and the coolant perform heat exchange in the first heat exchanger 25, and the water pump of the oil radiator system 19 can deliver the coolant in the first heat exchanger 25 to the battery assembly 26, achieving the effect of heating the battery assembly 26 with the heat of the hydraulic oil in the hydraulic device 24 after converting the oil heat generated by the hydraulic device 24 into water heat.

[0038] It should be understood that, in the waste heat recovery system 100 provided by the embodiment of the present application, by controlling the water pump of the oil radiator system 19 to be switched on, the first heat exchanger 25, the water pump of the oil radiator system 19 and the battery assembly 26 form the first heat dissipation circulation circuit to heat the battery assembly 26 after converting the oil heat generated by the hydraulic device 24 into water heat. During the use of the heat generated by the hydraulic device 24, the coolant does not pass through the oil radiator 30, to prevent the oil radiator 30 from absorbing part of the heat, and all the heat generated by the hydraulic device 24 is used to heat the battery assembly 26, which thus achieves the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0039] As shown in Figure 1, the waste heat recovery system 100 may additionally include a third three-way valve 3, an electronically controlled motor-driven water pump 4, a fourth three-way valve 5, a fifth three-way valve 10, a sixth three-way valve 9, a water radiator 29 and an electronic motor control assembly 27, a first valve port 31a of the third three-way valve 3 communicating with one end of the battery pack 26, a Petition 870240105007, dated 09 / 12 / 2024, page 19 / 48 13 / 27 end of the electronically controlled water pump 4 communicating with a third valve port 33a of the third three-way valve 3, a first valve port 51 of the fourth three-way valve 5 communicating with the other end of the electronically controlled water pump 4, a first valve port 101 of the fifth three-way valve 10 communicating with the other end of the battery pack 26, a first valve port 91 of the sixth three-way valve 9 communicating with a third valve port 103 of the fifth three-way valve 10, two ends of the water radiator 29 communicating with a second valve port 102 of the fifth three-way valve 10 and a second valve port 32a of the third three-way valve 3, respectively,and two ends of the engine's electronic control assembly 27 communicating with a second valve port 52 of the fourth three-way valve 5 and a second valve port 92 of the sixth three-way valve 9, respectively.

[0040] It is important to note that the electronic control unit of motor 27 can be used to issue control instructions to control the operation of all construction machinery. It should be understood that the electronic control unit of motor 27 can generate a large amount of heat during operation.

[0041] In practical application, controlling the first valve port 51 and the second valve port 52 of the fourth three-way valve 5 to open and a third valve port 53 to close, controlling the first valve port 31a and the third valve port 33a of the third three-way valve 3 to open and the second valve port 32a to close, controlling the first valve port 101 and the third valve port 103 of the fifth three-way valve 10 to open and the second valve port 102 to close, controlling the first valve port 91 and the second valve port 92 of the sixth three-way valve 9 to open and a third valve port 93 to close, and controlling the electronically controlled water pump 4 to turn on, the electronic control assembly of the motor 27, the sixth three-way valve 9, the fifth valve of three-way 10, battery pack 26,The third three-way valve 3, the electronically controlled water pump 4, and the fourth three-way valve 5 can form a second circulation circuit of, Petition 870240105007, dated 09 / 12 / 2024, page 20 / 48 14 / 27 heat dissipation. In this way, the electronically controlled water pump of motor 4 can conduct the coolant to pass through the electronic control assembly of motor 27, the coolant can absorb the heat generated by the electronic control assembly of motor 27, then the coolant can pass through the battery assembly 26, and the battery assembly 26 is heated with the heat carried by the coolant.

[0042] It should be understood that, in the process of heating the battery pack 26 after converting the heat generated by the electronic engine control assembly 27 into water heat, the coolant does not pass through the water radiator 29, to prevent the water radiator 29 from absorbing some of the heat, and all the heat generated by the electronic engine control assembly 27 is used to heat the battery pack 26, which thus achieves the effect of making full use of the heat generated by the electronic engine control assembly 27 and effectively reducing heat waste.

[0043] As shown in Figure 1, the waste heat recovery system 100 may additionally include an evaporator assembly 28, a first regulating valve 21 and a second regulating valve 23. The evaporator assembly 28 may heat or cool the crew cabin. The two ends of the first regulating valve 21 communicate with the first heat exchanger 25 and the evaporator assembly 28, respectively. One end of the second regulating valve 23 communicates with the evaporator assembly 28, and the other end of the second regulating valve 23 communicates with the water pump of the oil radiator system 19.

[0044] In practical application, by controlling the first regulating valve 21 and the second regulating valve 23 to be open, and controlling the oil radiator system water pump 19 to be switched on, the first heat exchanger 25, the oil radiator system water pump 19, the first regulating valve 21, the evaporator assembly 28 and the second regulating valve 23 form a third heat dissipation circuit.

[0045] Specifically, the water pump of the oil radiator system 19 can drive the coolant to pass through the first heat exchanger 25, and in combination with the aforementioned first oil circulation circuit, the coolant and hydraulic oil exchange heat in the first heat exchanger 25, i.e., the coolant can absorb Petition 870240105007, dated 09 / 12 / 2024, page 21 / 48 15 / 27 The heat from the hydraulic oil exiting the hydraulic device 24, the coolant can then pass through the evaporator assembly 28, and the evaporator assembly 28 can heat the crew cabin with the heat carried by the coolant, thus meeting the need to heat the crew cabin.

[0046] It should be understood that, in the process of converting the oil heat generated by the hydraulic device 24 into water heat to supply heat to the evaporator assembly 28 for heating, the coolant does not pass through the oil radiator 30, to prevent the oil radiator 30 from absorbing some of the heat, and all the heat generated by the hydraulic device 24 is used to heat the crew cabin, thus achieving the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0047] As shown in Figure 1, the waste heat recovery system 100 may include a crew cabin heating water pump 6, one end of the crew cabin heating water pump 6 communicates with one end of the evaporator assembly 28, the other end of the crew cabin heating water pump 6 communicates with the third valve port 53 of the fourth three-way valve 5, and the other end of the evaporator assembly 28 communicates with a third valve port 93 of the sixth three-way valve 9.

[0048] In practical application, by controlling the second gate of valve 52 and the third gate of valve 53 of the fourth three-way valve 5 to be open and the first gate of valve 51 to be closed, by controlling the second gate of valve 92 and the third gate of valve 93 of the sixth three-way valve 9 to be open and the first gate of valve 91 to be closed, and by controlling the crew cabin heating water pump 6 to be switched on, the engine electronic control assembly 27, the fourth three-way valve 5, the crew cabin heating water pump 6, the evaporator assembly 28 and the sixth three-way valve 9 form a fourth heat dissipation circulation circuit.

[0049] Specifically, the crew cabin heating water pump 6 can conduct the coolant to pass through the engine electronic control assembly 27, the coolant can Petition 870240105007, dated 09 / 12 / 2024, page 22 / 48 16 / 27 absorb the heat generated by the engine's electronic control assembly 27, the coolant can then pass through the evaporator assembly 28, and the evaporator assembly 28 can heat the crew cabin with the heat carried by the coolant, thus meeting the crew cabin heating requirement.

[0050] It should be understood that, in the process of supplying heat to the evaporator assembly 28 for heating after converting the heat generated by the engine electronic control assembly 27 into water heat, the coolant does not pass through the water radiator 29, to prevent the water radiator 29 from absorbing some of the heat, and all the heat generated by the engine electronic control assembly 27 is used to heat the crew cabin, thus achieving the effect of making full use of the heat generated by the engine electronic control assembly 27 and effectively reducing heat waste.

[0051] In this embodiment, Figure 2 is a schematic diagram of a waste heat recovery system according to another exemplary embodiment of the present application. When the ambient temperature of the construction machinery is lower than a predefined temperature value (which can be defined according to the actual situation, for example, the predefined temperature value is 5°C), the battery pack 26 cannot be in the ideal operating temperature range, and there is a heating demand for the battery pack 26. In such a case, as shown in Figure 2, the first water circulation circuit for heat dissipation is connected (the connection process can be referred to in the content introduced above) and the second water circulation circuit for heat dissipation is connected (the connection process can be referred to in the content introduced above).In this way, the heat generated by the hydraulic device 24 and the electronic engine control assembly 27 can be fully utilized, i.e., the coolant does not pass through the oil radiator 30 and the water radiator 29, to prevent the oil radiator 30 and the water radiator 29 from absorbing some of the heat, and all the heat generated by the hydraulic device 24 and the electronic engine control assembly 27 is used to heat the battery assembly 26, thus achieving the effect of making full use of the heat generated by the electronic engine control assembly 27 and the hydraulic device 24 and effectively reducing heat waste. Petition 870240105007, dated 09 / 12 / 2024, page 23 / 48 17 / 27

[0052] In this embodiment, Figure 3 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application. When the ambient temperature of the construction machinery is below a predefined temperature value (which can be adjusted according to the actual situation, for example, the predefined temperature value is 5°C), there is a heating demand for the crew cabin. In such a case, as shown in Figure 3, both the third water circulation circuit for heat dissipation and the fourth water circulation circuit for heat dissipation are connected.In this way, the heat generated by the hydraulic device 24 and the engine's electronic control assembly 27 can be fully utilized, i.e., the coolant does not pass through the oil radiator 30 and the water radiator 29, to prevent the oil radiator 30 and the water radiator 29 from absorbing some of the heat, and all the heat generated by the engine's electronic control assembly 27 and the hydraulic device 24 is used to heat the crew cabin, thus achieving the effect of making full use of the heat generated by the engine's electronic control assembly 27 and the hydraulic device 24 and effectively reducing heat waste.

[0053] In this embodiment, Figure 4 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application. When the ambient temperature of the construction machinery is below a predefined temperature value (which can be defined according to the actual situation, for example, the predefined temperature value is 5°C), battery pack 26 cannot be in the ideal operating temperature range, and there is a heating demand for battery pack 26, and at the same time, there is a heating demand for the crew cabin.In such a case, as shown in Figure 4, the first heat dissipation circulation circuit is connected, the battery pack 26 is heated with the heat generated by the hydraulic device 24, and all the heat generated by the hydraulic device 24 is used to heat the battery pack 26; and, as shown in Figure 4, the fourth heat dissipation circulation circuit is connected, the crew cabin is heated with the heat generated by the engine electronic control assembly 27, and all the heat generated by the engine electronic control assembly 27 is used. Petition 870240105007, dated 09 / 12 / 2024, page 24 / 48 18 / 27 to heat the crew cabin.

[0054] In one embodiment, when the ambient temperature of the construction machinery is below a predefined temperature value (which can be adjusted according to the actual situation, for example, the predefined temperature value is 5°C), the battery pack 26 cannot be in the ideal operating temperature range, and there is a heating demand for the battery pack 26, and at the same time, there is a heating demand for the crew cabin. It is also possible to make the second water circulation circuit for heat dissipation connected in such a way as to heat the battery pack 26 with the heat generated by the electronic engine control assembly 27; and to make the third water circulation circuit connected in such a way as to heat the crew cabin with the heat generated by the hydraulic device 24.

[0055] Figure 5 is a schematic diagram of a waste heat recovery system according to yet another exemplary embodiment of the present application. As shown in Figure 1 and Figure 5, the waste heat recovery system 100 may additionally include a first expansion valve 7, a first condenser 32 and a crew cabin refrigeration compressor 8, with one end of the first expansion valve 7 communicating with the evaporator assembly 28, one end of the first condenser 32 communicating with the other end of the first expansion valve 7, and two ends of the crew cabin refrigeration compressor 8 communicating with 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 crew cabin refrigeration compressor 8 can form a first refrigerant circulation circuit, and the first expansion valve 7 can adjust the refrigerant flow rate in the first refrigerant circulation circuit according to the actual situation, so as to avoid the occurrence of a situation where the refrigerant accumulates in a pipe and causes the pipe to burst.

[0057] As shown in Figure 5, when the ambient temperature is relatively high, there is a need for cooling in the crew cabin, so the first refrigerant circulation circuit is connected, the Petition 870240105007, dated 09 / 12 / 2024, page 25 / 48 19 / 27 crew cabin refrigeration compressor 8 drives the refrigerant through the first condenser 32, the first condenser 32 cools the refrigerant, the refrigerant can then pass through the evaporator assembly 28, and the evaporator assembly 28 uses the refrigerant to cool the crew cabin, thus meeting the refrigeration needs in the crew cabin.

[0058] As shown in Figure 1 and Figure 5, the waste heat recovery system 100 may additionally include a battery water pump 2, a second heat exchanger 31, a fifth regulating valve 11, a battery cooling compressor 1, a second condenser 33 and a second expansion valve 12, with one end of the battery water pump 2 communicating with the battery assembly 26, one end of the second heat exchanger 31 communicating with the other end of the battery water pump 2, two ends of the fifth regulating valve 11 communicating with the second heat exchanger 31 and the battery assembly 26, respectively, one end of the battery cooling compressor 1 communicating with the second heat exchanger 31, one end of the second condenser communicating with the other end of the battery cooling compressor 1,and two ends of the second expansion valve 12 communicating with the second condenser 33 and the second heat exchanger 31, respectively.

[0059] Specifically, the cooling compressor of battery 1, the second condenser 33, the second expansion valve 12 and the second heat exchanger 31 can form a second refrigerant circulation circuit, and the second expansion valve 12 can adjust the refrigerant flow rate in the second refrigerant circulation circuit according to the actual situation, so as to avoid the occurrence of a situation where the refrigerant accumulates in a pipe and causes the pipe to burst.

[0060] Specifically, the battery-powered water pump 2, the second heat exchanger 31, the fifth regulating valve 11, and the battery pack 26 can form a fifth heat dissipation circulation circuit. As shown in Figure 5, when the ambient temperature is relatively high, the battery pack 26 operates at a relatively high temperature, the battery-powered water pump 2 is controlled to be switched on, and the fifth regulating valve 11 is Petition 870240105007, dated 09 / 12 / 2024, page 26 / 48 20 / 27 controlled to be closed, the coolant passing through the battery assembly 26 carries a large amount of heat, and then passes through the second heat exchanger 31, the coolant (which circulates in the second coolant circulation circuit) in the second heat exchanger 31 and the coolant can exchange heat to play a role in reducing the temperature of the coolant, and the coolant exiting the second heat exchanger 31 can pass through the battery assembly 26 again.

[0061] In one embodiment, the second heat exchanger 31 may include a tubular heat exchanger, a plate heat exchanger, or something similar.

[0062] As shown in Figure 5, when the ambient temperature is relatively high, the electronic control assembly of the engine 27 needs to be cooled, so the second valve gate 32a and the third valve gate 33a of the third three-way valve 3 are controlled to be closed and the first valve gate 31a is controlled to be disconnected, the first valve gate 51 and the second valve gate 52 of the fourth three-way valve 5 are controlled to be closed and the third valve gate 53 is controlled to be disconnected, the first valve gate 91 and the second valve gate 92 of the sixth three-way valve 9 are controlled to be closed and the third valve gate 93 is controlled to be disconnected, and the second valve gate 102 and the third valve gate 103 of the fifth three-way valve 10 are controlled to be closed and the first valve gate 101 is controlled to be disconnected.In this way, the water radiator 29 can be used to cool the coolant, and the cooled coolant can be used to dissipate heat from the engine's electronic control assembly 27.

[0063] As shown in Figure 5, when the ambient temperature is relatively high, battery assembly 26 needs to be cooled, so the first gate of valve 171 and the second gate of valve 172 of the first three-way valve 17 are controlled to be closed and the third gate of valve 173 is controlled to be disconnected, and the second gate of valve 182 and the third gate of valve 183 of the second three-way valve 18 are controlled to be closed and the first gate of valve 181 is Petition 870240105007, dated 09 / 12 / 2024, page 27 / 48 21 / 27 controlled to be disconnected. In this way, the oil radiator 30 can be used to cool the coolant, and the cooled coolant can be used to dissipate heat from the battery pack 26.

[0064] As shown in Figure 1, the waste heat recovery system 100 may additionally include a third regulating valve 20 and a fourth regulating valve 22, with two ends of the third regulating valve 20 communicating with the battery assembly 26 and the first heat exchanger 25, respectively, and two ends of the fourth regulating valve 22 communicating with the battery assembly 26 and the oil radiator system water pump 19, respectively. The third regulating valve 20 may control the battery assembly 26 and the first heat exchanger 25 to be connected or disconnected, and the fourth regulating valve 22 may control the battery assembly 26 and the oil radiator system water pump 19 to be connected or disconnected.

[0065] In practical application, when it is necessary to connect the third heat dissipation circulation circuit (the connection conditions can be referred to in the previous introduction), the third regulating valve 20 can be controlled to make the battery assembly 26 and the first heat exchanger 25 connected, and the fourth regulating valve 22 can be controlled to make the battery assembly 26 and the oil radiator system water pump 19 connected.

[0066] As shown in Figure 1, the waste heat recovery system 100 may additionally include a first fan 13. The first fan 13 is positioned in front of the second condenser 33, and the first fan 13 may improve the condensation rate of the second condenser 33.

[0067] As shown in Figure 1, the water radiator 29 and the oil radiator 30 are arranged side by side, the waste heat recovery system 100 may additionally include a second fan 14, and the second fan 14 may improve the cooling rate of the water radiator 29 and the oil radiator 30.

[0068] As shown in Figure 1, the waste heat recovery system 100 may additionally include a third fan 15. The third fan 15 is arranged in front of the evaporator assembly 28, and the Petition 870240105007, dated 09 / 12 / 2024, page 28 / 48 22 / 27 third fan 15 can accelerate the airflow rate in the vicinity of the evaporator assembly 28, thus improving the operational efficiency of the evaporator assembly 28.

[0069] As shown in Figure 1, the waste heat recovery system 100 may additionally include a fourth fan 16. The fourth fan 16 is arranged in front of the first condenser 32, and the fourth fan 16 may improve the condensation rate of the second condenser 32.

[0070] Figure 6 is a schematic flow diagram of a waste heat recovery method according to an exemplary embodiment of the present application. As shown in Figure 6, the waste heat recovery method provided by the embodiment of the present application can be applied to the waste heat recovery system described in the previous embodiments, and the waste heat recovery control method includes the following steps.

[0071] S810, controlling a first valve port and a third valve port of a first three-way valve to be opened and a second valve port of the first three-way valve to be closed.

[0072] S820, controlling a first valve port and a second valve port of a second three-way valve to be opened and a third valve port of the second three-way valve to be closed, so that a hydraulic device, the second three-way valve, the first three-way valve and a first heat exchanger form a first oil circulation circuit.

[0073] S830, controlling an oil radiator system water pump to be switched on, so that the first heat exchanger, the oil radiator system water pump and a battery pack form a first heat dissipation circulation circuit to heat the battery pack after converting the oil heat generated by the hydraulic device into water heat.

[0074] According to the waste heat recovery method provided by the embodiment of the present application, controlling the water pump of the oil radiator system 19 to be switched on to make the first heat exchanger 25, the water pump of the oil radiator system 19 and the assembly of Petition 870240105007, dated 09 / 12 / 2024, page 29 / 48 23 / 27 battery 26 form the first water circulation circuit for heat dissipation, so as to heat the battery assembly 26 after converting the oil heat generated by the hydraulic device 24 into water heat. During the use of the heat generated by the hydraulic device 24, the coolant does not pass through the oil radiator 30, to prevent the oil radiator 30 from absorbing some of the heat, and all the heat generated by the hydraulic device 24 is used to heat the battery assembly 26, thus achieving the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0075] Figure 7 is a schematic flow diagram of a waste heat recovery method according to another exemplary embodiment of the present application. As shown in Figure 7, the waste heat recovery method may additionally include the following steps.

[0076] S840, controlling a first valve port and a second valve port of a fourth three-way valve to be opened and a third valve port of the fourth three-way valve to be closed.

[0077] S850, controlling a first valve port and a third valve port of a third three-way valve to be opened and a second valve port of the third three-way valve to be closed.

[0078] S860, controlling a first valve port and a third valve port of a fifth three-way valve to be opened and a second valve port of the fifth three-way valve to be closed.

[0079] S870, controlling a first valve port and a second valve port of a sixth three-way valve to be opened and a third valve port of the sixth three-way valve to be closed.

[0080] S880, controlling an electronically controlled motor-driven water pump to be switched on, so that an electronic motor control assembly, the sixth three-way valve, the fifth three-way valve, the battery pack, the third three-way valve, the electronically controlled motor-driven water pump and the fourth three-way valve form a second heat dissipation circulation circuit to heat the battery pack after converting the heat generated by the electronic motor control assembly into water heat. Petition 870240105007, dated 09 / 12 / 2024, page 30 / 48 24 / 27

[0081] It should be understood that, in the process of heating the battery pack 26 after converting the heat generated by the electronic engine control assembly 27 into water heat, the coolant does not pass through the water radiator 29, to prevent the water radiator 29 from absorbing some of the heat, and all the heat generated by the electronic engine control assembly 27 is used to heat the battery pack 26, which thus achieves the effect of making full use of the heat generated by the electronic engine control assembly 27 and effectively reducing heat waste.

[0082] In one mode, stages S840, S850, S860, S870 and S880 can be performed after stage S830 or before stage S810.

[0083] Figure 8 is a schematic flow diagram of a waste heat recovery method according to yet another exemplary embodiment of the present application. As shown in Figure 8, the waste heat recovery method additionally includes the following steps.

[0084] S890, controlling a first regulating valve and a second regulating valve to be opened.

[0085] S900, controlling the oil radiator system water pump to be switched on, so that the first heat exchanger, the oil radiator system water pump, the first regulating valve, an evaporator assembly and the second regulating valve form a third heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the oil heat generated by the hydraulic device into water heat.

[0086] It should be understood that, in the process of supplying heat to the evaporator assembly 28 after converting the oil heat generated by the hydraulic device 24 into water heat, the coolant does not pass through the oil radiator 30, to prevent the oil radiator 30 from absorbing some of the heat, and all the heat generated by the hydraulic device 24 is used to heat a crew cabin, thus achieving the effect of making full use of the heat generated by the hydraulic device 24 and effectively reducing heat waste.

[0087] In one mode, stages S890 and S900 can be performed after stage S880 or before stage S840.

[0088] Figure 9 is a schematic flow diagram of a method. Petition 870240105007, dated 09 / 12 / 2024, page 31 / 48 25 / 27 of waste heat recovery according to yet another exemplary embodiment of the present application. As shown in Figure 9, the waste heat recovery method additionally includes the following steps.

[0089] S910, controlling the second valve port and the third valve port of the fourth three-way valve to be opened and the first valve port of the fourth three-way valve to be closed.

[0090] S920, controlling the second valve port and the third valve port of the sixth three-way valve to be opened and the first valve port of the sixth three-way valve to be closed.

[0091] S930, controlling a crew cabin heating water pump to be switched on, so that the engine electronic control assembly, the fourth three-way valve, the crew cabin heating water pump, the evaporator assembly and the sixth three-way valve form a fourth heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the heat generated by the engine electronic control assembly into water heat.

[0092] It should be understood that, in the process of supplying heat to the evaporator assembly 28 for heating after converting the heat generated by the engine electronic control assembly 27 into water heat, the coolant does not pass through the water radiator 29, to prevent the water radiator 29 from absorbing some of the heat, and all the heat generated by the engine electronic control assembly 27 is used to heat the crew cabin, thus achieving the effect of making full use of the heat generated by the engine electronic control assembly 27 and effectively reducing heat waste.

[0093] In one mode, stages S910, S920 and S930 can be performed after stage S900 or before stage S890.

[0094] One embodiment of the present application additionally provides construction machinery.

[0095] Construction machinery includes the aforementioned waste heat recovery system 100 and has all the functions of the waste heat recovery system 100. The effects of construction machinery can be referred to the effects of the aforementioned waste heat recovery system 100. In one embodiment, construction machinery may include an excavator, a crane, and the like. Petition 870240105007, dated 09 / 12 / 2024, page 32 / 48 26 / 27

[0096] The basic principles of the present application are described above in conjunction with specific embodiments; however, it should be noted that the merits, advantages, effects, etc. mentioned in the present application are merely illustrative and not restrictive, and should not be considered as necessary for each embodiment of the present application. Furthermore, the specific details disclosed above are only for illustrative and ease of understanding purposes, and not for limitation, and the details above do not limit the present application as it has to adopt the specific details above for implementation.

[0097] The schematic diagrams of the components, apparatus, 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 illustrated in the schematic diagrams. As persons skilled in the art will recognize, the components, device, apparatus, and system may be connected, arranged, or configured in any manner. Words such as “comprise,” “include,” and “have” are open terms meaning “including, but not limited to,” and may be used interchangeably with them. The terms “or” and “and” as used herein refer to the term “and / or” and are used interchangeably with it unless the context clearly indicates otherwise. The term “such as” as used herein refers to the expression “such as, but not limited to,” and is used interchangeably with it.

[0098] It is also important to note that, in the apparatus, device and method of the present application, the components or steps may be decomposed and / or recombined. These decompositions and / or recombinations should be considered as equivalent solutions of the present application.

[0099] The above description of the disclosed aspects is provided to enable anyone skilled in the art to make or use the present application. Various modifications to these aspects are readily apparent to persons skilled in the art, and the general principles set forth herein may be applied to other aspects without departing from the scope of the present application. Consequently, the present application is not intended to be limited to the aspects shown herein, but should be granted to the fullest extent. Petition 870240105007, dated 09 / 12 / 2024, pages 33 / 48 27 / 27 broad scope consistent with the innovative principles and resources revealed in this document.

[00100] The above description is given for illustrative and descriptive purposes only. Furthermore, this description is not intended to limit the embodiments of this application to the form disclosed herein. Although various exemplary aspects and embodiments have been discussed above, certain variations, modifications, alterations, additions, and subcombinations thereof will be recognized by persons skilled in the art. Petition 870240105007, dated 09 / 12 / 2024, pp. 34 / 48

Claims

1 / 7 CLAIMS 1. Waste heat recovery system, characterized by comprising: a hydraulic device (24); a first three-way valve (17), a first valve port (171) of the first three-way valve (17) communicating with one end of the hydraulic device (24); a second three-way valve (18), a second valve port (182) of the second three-way valve (18) communicating with the other end of the hydraulic device (24); a first heat exchanger (25), two ends of the first heat exchanger (25) communicating with a third valve port (173) of the first three-way valve (17) and a first valve port (181) of the second three-way valve (18), respectively;an oil radiator (30), two ends of the oil radiator (30) being connected to a second valve port (172) of the first three-way valve (17) and to a third valve port (183) of the second three-way valve (18), respectively; a water pump of the oil radiator system (19), one end of the water pump of the oil radiator system (19) being connected to the first heat exchanger (25); and a battery assembly (26), two ends of the battery assembly (26) communicating with the other end of the water pump of the oil radiator system (19) and the first heat exchanger (25), respectively.

2. Waste heat recovery system according to claim 1, characterized by further comprising: a third three-way valve (3), a first valve port (31a) of the third three-way valve (3) communicating with one end of the battery assembly (26); an electronically controlled motor-driven water pump (4), one end of the electronically controlled motor-driven water pump (4) communicating with a third valve port (33a) of the third three-way valve (3); Petition 870240105007, dated 09 / 12 / 2024, page 35 / 48 2 / 7 a fourth three-way valve (5), a first valve port (51) of the fourth three-way valve (5) communicating with the other end of the electronically controlled motor-driven water pump (4); a fifth three-way valve (10), a first valve port (101) of the fifth three-way valve (10) communicating with the other end of the battery assembly (26);a sixth three-way valve (9), a first valve port (91) of the sixth three-way valve (9) communicating with a third valve port (103) of the fifth three-way valve (10); a water radiator (29), two ends of the water radiator (29) communicating with a second valve port (102) of the fifth three-way valve (10) and a second valve port (32a) of the third three-way valve (3), respectively; and an electronic engine control assembly (27), two ends of the electronic engine control assembly (27) communicating with a second valve port (52) of the fourth three-way valve (5) and a second valve port (92) of the sixth three-way valve (9), respectively.

3. Waste heat recovery system according to claim 2, characterized by further comprising: an evaporator assembly (28); a first regulating valve (21), two ends of the first regulating valve (21) communicating with the first heat exchanger (25) and the evaporator assembly (28), respectively; and a second regulating valve (23), one end of the second regulating valve (23) communicating with the evaporator assembly (28), and the other end of the second regulating valve (23) communicating with the water pump of the oil radiator system (19).

4. Waste heat recovery system according to claim 3, characterized by further comprising: a crew cabin heating water pump (6), one end of the crew cabin heating water pump (6) communicating with one end of the evaporator assembly (28), the other end of the crew cabin heating water pump (6) communicating with a third valve port (53) of the fourth three-way valve (5), and the other end of the evaporator assembly (28) communicating with a third valve port (93) of the sixth three-way valve (9).

5. Waste heat recovery system according to claim 3, characterized by further comprising: a first expansion valve (7), one end of the first expansion valve (7) communicating with the evaporator assembly (28); a first condenser (32), one end of the first condenser (32) communicating with the other end of the first expansion valve (7); and a crew cabin refrigeration compressor (8), two ends of the crew cabin refrigeration compressor (8) communicating with the evaporator assembly (28) and the first condenser (32), respectively.

6. Waste heat recovery system, according to any one of claims 1 to 5, characterized by further comprising: a third regulating valve (20), two ends of the third regulating valve (20) communicating with the battery assembly (26) and the first heat exchanger (25), respectively; and a fourth regulating valve (22), two ends of the fourth regulating valve (22) communicating with the battery assembly (26) and the water pump of the oil radiator system (19), respectively.

7. Waste heat recovery system, according to any one of claims 1 to 6, characterized by further comprising: a battery-powered water pump (2), one end of the battery-powered water pump (2) communicating with the battery assembly (26); a second heat exchanger (31), one end of the second heat exchanger (31) communicating with the other end of the battery-powered water pump (2); a fifth regulating valve (11), two ends of the fifth regulating valve (11) communicating with the second heat exchanger (31) and the battery assembly (26), respectively; a battery cooling compressor (1), one end of the battery cooling compressor (1) communicating with the second heat exchanger (31); Petition 870240105007, dated 09 / 12 / 2024, p.37 / 48 4 / 7 a second condenser (33), one end of the second condenser (33) communicating with the other end of the battery cooling compressor (1); and a second expansion valve (12), two ends of the second expansion valve (12) communicating with the second condenser (33) and the second heat exchanger (31), respectively.

8. Waste heat recovery method applied to a waste heat recovery system according to any one of claims 1 to 7, characterized in that the waste heat recovery method comprises: controlling the first valve port and the third valve port of the first three-way valve to be open and the second valve port of the first three-way valve to be closed; controlling the first valve port and the second valve port of the second three-way valve to be open and the third valve port of the second three-way valve to be closed, so that the hydraulic device, the second three-way valve, the first three-way valve and the first heat exchanger form a first oil circulation circuit;and control the oil radiator system's water pump to be switched on, so that the first heat exchanger, the oil radiator system's water pump, and the battery pack form a first heat dissipation circulation circuit to heat the battery pack after converting the oil heat generated by the hydraulic device into water heat.

9. Waste heat recovery method according to claim 8, characterized in that the waste heat recovery system further comprises: a third three-way valve (3), a first valve port (31a) of the third three-way valve (3) communicating with one end of the battery assembly (26); an electronically controlled motor-driven water pump (4), one end of the electronically controlled motor-driven water pump (4) communicating with a third valve port (33a) of the third three-way valve (3); a fourth three-way valve (5), a first valve port (51) of the fourth three-way valve (5) communicating with the other end of the electronically controlled motor-driven water pump (4); a fifth three-way valve (10), a first valve port of the fifth three-way valve (10) communicating with the other end of the battery assembly (26);a sixth three-way valve (9), a first valve port (91) of the sixth three-way valve (9) communicating with a third valve port (101) of the fifth three-way valve (10); a water radiator (29), two ends of the water radiator (29) communicating with a second valve port (102) of the fifth three-way valve (10) and a second valve port (32a) of the third three-way valve (3), respectively;and an electronic engine control assembly (27), two ends of the electronic engine control assembly (27) communicating with a second valve port (52) of the fourth three-way valve (5) and a second valve port (92) of the sixth three-way valve (9), respectively, wherein the method of recovering waste heat further comprises: controlling the first valve port and the second valve port of the fourth three-way valve to be opened and a third valve port of the fourth three-way valve to be closed; controlling the first valve port and the third valve port of the third three-way valve to be opened and the second valve port of the third three-way valve to be closed; controlling the first valve port and the third valve port of the fifth three-way valve to be opened and the second valve port of the fifth three-way valve to be closed;to control the first valve port and the second valve port of the sixth three-way valve to open and a third valve port of the sixth three-way valve to close; and to control the electronically controlled motor-driven water pump to turn on, so that the electronic motor control assembly, the sixth three-way valve, the fifth three-way valve, the battery pack, the third three-way valve, the electronically controlled motor-driven water pump and the fourth three-way valve form a second heat dissipation circulation circuit to heat the battery pack after converting the heat generated by the electronic motor control assembly into water heat.

10. Waste heat recovery method according to claim 9, characterized in that the waste heat recovery system further comprises: an evaporator assembly (28); a first regulating valve (21), two ends of the first regulating valve (21) communicating with the first heat exchanger (25) and the evaporator assembly (28), respectively; and a second regulating valve (23), one end of the second regulating valve (23) communicating with the evaporator assembly (28), and the other end of the second regulating valve (23) communicating with the water pump of the oil radiator system (19); wherein the waste heat recovery method further comprises: controlling the first regulating valve and the second regulating valve to be opened;and control the oil radiator system water pump to be switched on, so that the first heat exchanger, the oil radiator system water pump, the first regulating valve, the evaporator assembly and the second regulating valve form a third heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the oil heat generated by the hydraulic device into water heat.

11. Waste heat recovery method according to claim 10, characterized in that the waste heat recovery system further comprises: a crew cabin heating water pump (6), one end of the crew cabin heating water pump (6) communicating with one end of the evaporator assembly (28), the other end of the crew cabin heating water pump (6) communicating with the third valve port (53) of the fourth three-way valve (5), and the other end of the evaporator assembly (28) communicating Petition 870240105007, dated 09 / 12 / 2024, page. 40 / 48 7 / 7 with the third valve port (93) of the sixth three-way valve (9), wherein the waste heat recovery method further comprises: controlling the second valve port and the third valve port of the fourth three-way valve to be open and the first valve port of the fourth three-way valve to be closed;to control the second valve gate and the third valve gate of the sixth three-way valve to open and the first valve gate of the sixth three-way valve to close; and to control the crew cabin heating water pump to turn on, so that the engine electronic control assembly, the fourth three-way valve, the crew cabin heating water pump, the evaporator assembly, and the sixth three-way valve form a fourth heat dissipation circulation circuit to supply the evaporator assembly with heat for heating after converting the heat generated by the engine electronic control assembly into water heat.

12. Construction machinery, characterized by comprising: a waste heat recovery system according to any one of claims 1 to 7. Petition 870240105007, dated 09 / 12 / 2024, pp. 41 / 48

Images