Cooling system and dual-power driving module

Abstract

The utility model relates to the technical field of liquid cooling, in particular to a cooling system and a dual-power driving module, and the cooling system comprises a first heat dissipation system which is started based on the driving of a first power module and forms a first passage for the circulation of cooling liquid; the second heat dissipation system is started on the basis of driving of the second power module and forms a second passage for circulation of the cooling liquid; the first channel and the second channel are communicated through a temperature control module, and the temperature control module is started when the temperature of the cooling liquid is lower than a preset temperature threshold value. The double-power hydraulic excavator solves the problems that an existing double-power hydraulic excavator needs to design two sets of independent heat dissipation systems for heat dissipation in two working modes, but due to the fact that the size of a radiator is limited by the whole machine space, the size in the heat dissipation width direction is small, and only a diesel engine heat dissipation system can meet the heat balance requirement at present; and a three-electric system is relatively high in heat balance temperature and has a high-temperature damage risk.

Description

Technical Field

[0001] This utility model relates to the field of liquid cooling technology, and in particular to a cooling system and a dual-power drive module. Background Technology

[0002] The "three-electric system" of a hydraulic excavator usually refers to three key components in the electrical system: controller, rectifier, and motor. The functions of these components in the excavator's electrical and electronic control system are as follows: (1) Controller: Responsible for processing data input from various sensors and controlling the working state of other electrical equipment according to preset programs, achieving precise control of the engine, hydraulic system, and other working devices to ensure efficient and safe operation of the excavator; (2) Rectifier: Converts the alternating current generated by the generator into direct current for use by onboard electrical equipment or to charge the battery; (3) Motor: A device that converts electrical energy into mechanical energy. In hydraulic excavators, the motor can be used to drive various auxiliary equipment, such as fans and water pumps. Furthermore, some modern excavators may also adopt electric drive systems to replace traditional hydraulic drives in order to improve efficiency and reduce emissions.

[0003] The existing dual-power excavator cooling system works as follows: 1. When the machine uses a diesel engine as its power source, the clutch is engaged, and the diesel engine drives the electric motor through the clutch. The diesel engine radiator receives water from the diesel engine water pump, which then returns the water to the radiator, thus cooling the diesel engine and ensuring it operates below 100°C. At this time, the three-electric system (electric motor, rectifier, and motor) is not working and does not generate heat; the coolant in the radiator of the three-electric system is not flowing. 2. When the machine uses a 380V external power supply, the clutch is disengaged, the diesel engine is not working and does not generate heat. The electric motor operates through the external power supply, driving the machine. The coolant in the radiator of the three-electric system is pumped by the water pump, flowing through the controller / rectifier and the motor before returning to the radiator, thus achieving heat exchange in the three-electric system and ensuring the controller, rectifier, and motor operate below 65°C. At this time, the coolant in the diesel engine radiator is not flowing.

[0004] The existing solution has two working modes, and both modes generate a lot of heat. Therefore, two independent cooling systems need to be designed. However, due to the size of the radiator being limited by the space of the whole machine, the width dimension of the heat dissipation is too small, which means that the two systems cannot meet the thermal balance requirements at the same time. Currently, only the diesel engine cooling system can meet the thermal balance requirements. The thermal balance temperature of the three-electric system is high, which poses a risk of high temperature damage.

[0005] Therefore, this utility model proposes a cooling system and a dual-power drive module. Utility Model Content

[0006] The utility model of this invention provides a cooling system and a dual-power drive module, which mainly solves the problem that existing dual-power hydraulic excavators need to design two independent cooling systems for cooling in two working modes. However, due to the limitation of the radiator size by the overall machine space, the cooling width dimension is relatively small. Currently, only the diesel engine cooling system can meet the thermal balance requirements. The thermal balance temperature of the three-electric system is relatively high, which poses a risk of high-temperature damage.

[0007] This utility model proposes a cooling system, comprising:

[0008] The first heat dissipation system is started by the drive of the first power module and forms the first passage for the flow of coolant.

[0009] The second heat dissipation system is activated by the second power module and forms a second passage for the flow of coolant.

[0010] The first passage and the second passage are connected through a temperature control module, and the temperature control module is activated when the coolant temperature is lower than a preset temperature threshold.

[0011] Preferably, the temperature control module includes:

[0012] The conductive tube is connected at both ends to the first path and the second path, respectively.

[0013] A control valve is disposed on the conductive pipe and is used to control the opening or closing of the conductive pipe; the control valve opens when the coolant temperature is lower than a preset temperature threshold.

[0014] Preferably, the first heat dissipation system is a heat dissipation system for the three-electric system, and the first power module is a motor;

[0015] The second cooling system is a diesel engine cooling system, and the second power module is a diesel engine;

[0016] Driven by the first power module, the control valve obtains the coolant temperature of the second heat dissipation system and opens the conduction pipe when the temperature is lower than a preset temperature threshold, connecting the first passage and the second passage.

[0017] Preferably, the first heat dissipation system includes:

[0018] First radiator;

[0019] Water pump;

[0020] Controller;

[0021] Rectifier;

[0022] The first channel sequentially connects the first power module, the first radiator, the water pump, the controller, and the rectifier before returning to the first power module.

[0023] Preferably, the second heat dissipation system includes:

[0024] Second radiator;

[0025] The second path is a closed path connecting the second power module and the second heat sink.

[0026] Preferably, a clutch is provided between the first power module and the second power module;

[0027] When the first power module is driven by an external power source, the clutch separates the first power module from the second power module, and the coolant is transmitted along the first passage.

[0028] When the second power module is driven, the first power module drives the second power module through the clutch, and the coolant is transmitted along the second passage.

[0029] Preferably, when the external power supply drives the first power module, the control valve opens when the coolant temperature of the second heat dissipation system is lower than a preset temperature threshold, and the first radiator and the second radiator are connected to allow the coolant to circulate.

[0030] Preferably, it further includes:

[0031] The flow-expanding pipe is connected at both ends to the first passage and the second passage, respectively; the two ends of the flow-expanding pipe are located on the same side of the first power module and the second power module, and the two ends of the conducting pipe are located on the other side of the first power module and the second power module.

[0032] This utility model also proposes a dual-power drive module, wherein the dual-power drive module is provided with the cooling system described in any one of claims 1 to 8.

[0033] Preferably, the dual-power drive module is a dual-power hydraulic excavator.

[0034] As can be seen from the above, the following beneficial effects can be obtained by applying the technical solution provided by this utility model:

[0035] First, the two independent heat dissipation systems in the cooling system proposed in this utility model can be used in parallel when the coolant temperature is low. Due to the increased radiator area, the heat dissipation capacity is improved, and the thermal balance of the cooling system is guaranteed.

[0036] Secondly, the cooling system proposed in this utility model uses two heat dissipation systems in parallel when the coolant temperature is low through a temperature control module, which ensures that the newly added cooling system effectively improves the heat dissipation capacity, avoids reverse heating of the high-temperature coolant, and the component is relatively simple and the cost is controllable.

[0037] Third, the cooling system proposed in this utility model is applicable to dual-power drive modules equipped with a heat dissipation system for the three-electric system and a heat dissipation system for the diesel engine, which improves the problem of excessive thermal balance in the three-electric system and meets the safe and reliable working requirements of the entire three-electric system.

[0038] Fourth, the cooling system proposed in this utility model also achieves pipe connection between the newly added parallel heat dissipation system and the original heat dissipation system through the expansion pipe, ensuring the normal flow of coolant and the normal liquid cooling process of the newly added heat dissipation system.

[0039] Fifth, the drive module proposed in this utility model, through its built-in cooling system, can maintain its thermal balance under the drive of any power module, thereby improving the working stability and safety of the drive module. Attached Figure Description

[0040] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0041] Figure 1 This is a structural diagram of the cooling system for the current dual-power drive module;

[0042] Figure 2 This is a structural block diagram of the cooling system in Embodiment 1 of this utility model. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0044] Existing dual-power hydraulic excavators require the design of two independent cooling systems to dissipate heat for two different working modes. However, due to the limitation of the radiator size by the overall machine space, the width dimension of the heat dissipation is relatively small. Currently, only the diesel engine cooling system can meet the thermal balance requirements. The thermal balance temperature of the three-electric system is greater than 65℃, which poses a risk of high-temperature damage.

[0045] Example 1

[0046] like Figure 2As shown, in order to solve the above problems, this embodiment proposes a cooling system, including a first heat dissipation system and a second heat dissipation system that are independently configured; the first heat dissipation system is started by the drive of the first power module 31 and forms a first passage for coolant circulation; the second heat dissipation system is started by the drive of the second power module 32 and forms a second passage for coolant circulation; the first passage and the second passage are also connected through a temperature control module, and the temperature control module is activated when the coolant temperature is lower than a preset temperature threshold.

[0047] Preferably, in this embodiment, only one power module 31 and the second power module 32 can be started at the same time, corresponding to only one of the first heat dissipation system and the second heat dissipation system operating at the same time.

[0048] Preferably, in this embodiment, the first heat dissipation system and the second heat dissipation system form a closed loop, and the access position of the temperature control module is close to the starting point of the current closed loop.

[0049] In this embodiment, both the first and second heat dissipation systems are based on liquid cooling. Therefore, when connected, the originally static coolant can be utilized, and the originally unused radiators can be used in parallel, thereby improving the heat dissipation capacity.

[0050] More specifically, the temperature control module includes a conductive pipe 10 and a control valve; the two ends of the conductive pipe 10 are respectively connected to a first passage and a second passage; the control valve is disposed on the conductive pipe 10 and is used to control the conduction or shutdown of the conductive pipe 10; the control valve opens when the coolant temperature is lower than a preset temperature threshold.

[0051] Preferably, in this embodiment, the control valve can be a temperature control valve directly, or a solenoid valve 21 and a second controller 22 can be used. After the second controller 22 obtains the coolant temperature through sensors and other devices, it determines whether to open the solenoid valve 21. When the coolant temperature is detected to be lower than the preset temperature threshold, the solenoid valve 21 is opened to control the coolant to flow along the direction of the conductor 10, thereby realizing the liquid cooling process.

[0052] Preferably, in this embodiment, the preset temperature threshold is 60°C.

[0053] In this embodiment, when the coolant temperature meets the condition of being lower than the preset temperature threshold, that is, when the coolant is in a low temperature state, high-efficiency heat transfer can be achieved during the liquid cooling process. At this time, the control valve is opened to allow the coolant to enter the current heat dissipation system for parallel cooling, thus avoiding the possibility of the excessively high-temperature coolant reversibly heating the heat dissipation system.

[0054] More specifically, the first cooling system is a three-electric system cooling system, and the first power module 31 is a motor; the second cooling system is a diesel engine cooling system, and the second power module 32 is a diesel engine; the control valve 20, driven by the first power module 31, obtains the coolant temperature of the second cooling system and opens the conduction pipe 10 when it is lower than the preset temperature threshold, connecting the first passage and the second passage.

[0055] Preferably, in this embodiment, the first power module 31 is an externally powered motor; the second power module 32 is a diesel engine powered motor.

[0056] Preferably, in this embodiment, the second controller 22 acquires the coolant temperature of the second cooling system and opens the conduction pipe 10 when it is lower than a preset temperature threshold. Specifically, the second controller 22 collects the coolant temperature from the engine ECU of the diesel engine, and the solenoid valve 21 opens when the coolant temperature of the diesel engine cooling system is lower than 60°C.

[0057] In this embodiment, after the solenoid valve 21 is opened, the diesel engine cooling system is connected to the three-electric system cooling system. The diesel engine radiator and the three-electric system radiator are connected in parallel to the three-electric system. The two sets of radiators work at the same time, which greatly increases the heat dissipation capacity of the three-electric system and makes the thermal equilibrium temperature of the three-electric system lower than 65°C.

[0058] More specifically, the first heat dissipation system includes a first radiator 41, a water pump 42, a first controller 43, and a rectifier 44; the first passage sequentially connects the first power module 31, the first radiator 41, the water pump 42, the first controller 43, and the rectifier 44 before returning to the first power module 31.

[0059] More specifically, the second heat dissipation system includes a second heat sink 51; the second passage is a closed passage connecting the second power module 32 and the second heat sink 51.

[0060] More specifically, a clutch 33 is provided between the first power module 31 and the second power module 32; when the first power module 31 is driven by an external power source, the clutch 33 separates the first power module 31 from the second power module 32, and the coolant is transmitted along the first passage; when the second power module 32 is driven, the first power module 31 drives the second power module 32 through the clutch 33, and the coolant is transmitted along the second passage.

[0061] More specifically, when the first power module 31 is driven by an external power source, the control valve opens when the coolant temperature of the second heat dissipation system is lower than a preset temperature threshold, and the first radiator 41 and the second radiator 51 are connected to allow coolant to circulate.

[0062] In this embodiment, the first cooling system operates as follows: when the entire machine is powered by a 380V external power supply, the clutch 33 disengages, the diesel engine does not operate and does not generate heat, the motor operates through the external power supply, driving the entire machine, and the coolant in the first radiator 41, i.e., the radiator of the three-electric system, is driven by the water pump 42, flows through the first controller 43 / rectifier 44 and the motor, and then returns to the radiator, realizing heat exchange of the three-electric system (first controller 43, rectifier 44, and motor); at the same time, the second controller 22 collects the coolant temperature from the engine ECU, and when the diesel engine cools down... When the system coolant temperature is below 60℃, solenoid valve 21 opens, connecting the second radiator 51 (diesel engine radiator) to the three-electric system radiator. The diesel engine radiator and the three-electric system radiator are connected in parallel to the three-electric system, and both radiators operate simultaneously. The working process of the second cooling system is as follows: When the entire machine uses the diesel engine as power, clutch 33 is engaged, and the diesel engine drives the motor through clutch 33. The water from the diesel engine radiator flows through the diesel engine via diesel engine water pump 42 and back to the radiator, achieving diesel engine cooling and ensuring the diesel engine operates at temperatures below 100℃. When the three-electric system is not operating, no heat is generated, and the coolant in the three-electric system radiator does not flow.

[0063] More specifically, it also includes a flow-expanding pipe 11 with its two ends connected to the first passage and the second passage respectively; the two ends of the flow-expanding pipe 11 are located on the same side of the first power module 31 and the second power module 32, and the two ends of the conducting pipe 10 are located on the other side of the first power module 31 and the second power module 32.

[0064] Example 2

[0065] To address the aforementioned issues, this embodiment proposes a dual-power drive module, which incorporates the cooling system described in Embodiment 1.

[0066] Preferably, the dual-power drive module is a dual-power hydraulic excavator.

[0067] In summary, Embodiments 1 and 2 present a cooling system and a dual-power drive module. By selecting and configuring the cooling system as a dual heat dissipation system, the heat dissipation capacity of the cooling system can be improved, and the thermal balance of the cooling system and the whole machine can be maintained.

[0068] The embodiments described above do not constitute a limitation on the scope of protection of this technical solution. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the above embodiments should be included within the scope of protection of this technical solution.

Claims

1. A cooling system, characterized in that, include: The first heat dissipation system is started by the drive of the first power module and forms the first passage for the flow of coolant. The second heat dissipation system is activated by the second power module and forms a second passage for the flow of coolant. The first passage and the second passage are connected through a temperature control module, and the temperature control module is activated when the coolant temperature is lower than a preset temperature threshold.

2. The cooling system according to claim 1, characterized in that, The temperature control module includes: The conductive tube is connected at both ends to the first path and the second path, respectively. A control valve is disposed on the conductive pipe and is used to control the opening or closing of the conductive pipe; the control valve opens when the coolant temperature is lower than a preset temperature threshold.

3. A cooling system according to claim 2, characterized in that: The first heat dissipation system is a heat dissipation system for the three-electric system, and the first power module is a motor; The second cooling system is a diesel engine cooling system, and the second power module is a diesel engine; Driven by the first power module, the control valve obtains the coolant temperature of the second heat dissipation system and opens the conduction pipe when the temperature is lower than a preset temperature threshold, connecting the first passage and the second passage.

4. A cooling system according to any one of claims 1 to 3, characterized in that, The first heat dissipation system includes: First radiator; Water pump; Controller; Rectifier; The first channel sequentially connects the first power module, the first radiator, the water pump, the controller, and the rectifier before returning to the first power module.

5. A cooling system according to claim 4, characterized in that, The second heat dissipation system includes: Second radiator; The second path is a closed path connecting the second power module and the second heat sink.

6. A cooling system according to claim 5, characterized in that: A clutch is provided between the first power module and the second power module; When the first power module is driven by an external power source, the clutch separates the first power module from the second power module, and the coolant is transmitted along the first passage. When the second power module is driven, the first power module drives the second power module through the clutch, and the coolant is transmitted along the second passage.

7. A cooling system according to claim 6, characterized in that: When the external power supply drives the first power module, the control valve opens when the coolant temperature of the second heat dissipation system is lower than a preset temperature threshold, and the first radiator and the second radiator are connected to allow the coolant to circulate.

8. A cooling system according to claim 2 or 3, characterized in that, Also includes: The flow-expanding pipe is connected at both ends to the first passage and the second passage, respectively; the two ends of the flow-expanding pipe are located on the same side of the first power module and the second power module, and the two ends of the conducting pipe are located on the other side of the first power module and the second power module.

9. A dual-power drive module, characterized in that: The dual-power drive module is equipped with the cooling system described in any one of claims 1 to 8.

10. The dual-power drive module according to claim 9, characterized in that: The dual-power drive module is a dual-power hydraulic excavator.

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