Cooling system for electric excavator and electric excavator

Abstract

The invention provides a cooling system for an electric excavator and the electric excavator, and relates to the technical field of electric excavator cooling. A heat exchange assembly of the heat dissipation module comprises a first heat dissipation cavity and a second heat dissipation cavity which are not communicated, a heat dissipation fan is connected with the heat exchange assembly, and the rotating speed of the heat dissipation fan can be adjusted. Two ends of a hydraulic cooling loop of the hydraulic cooling module are respectively communicated with the first heat dissipation cavity; a hydraulic oil tank, a hydraulic pump and a working hydraulic element are arranged on the hydraulic cooling loop; the two ends of an electrically-driven cooling loop of the electrically-driven cooling module communicate with the second heat dissipation cavity, the motor, the controller and the water pump mechanism are arranged on the electrically-driven cooling loop, and the water pump mechanism can adjust the flow of cooling liquid. In the cooling system, the first heat dissipation cavity and the second heat dissipation cavity share the heat dissipation fan, so that the size of the cooling system can be reduced, and the requirement for compact layout is met. And the water pump mechanism is linked with the cooling fan, so that the control precision of the oil temperature and the water temperature can be improved, and accurate temperature control is realized.

Description

Technical Field

[0001] This application relates to the field of electric excavator cooling technology, and in particular to a cooling system for an electric excavator and an electric excavator. Background Technology

[0002] With the electrification of construction machinery, electric excavators are widely used in various construction scenarios due to their advantages of low emissions and low noise. As a core component of electric excavators, the cooling system directly affects the operational stability and overall reliability of the electric drive system (motor and controller) and hydraulic system. The electric drive and hydraulic systems generate a large amount of heat during operation. If this heat cannot be dissipated in time, it can lead to problems such as decreased motor efficiency, controller malfunction, and accelerated hydraulic oil oxidation, and in severe cases, cause the entire machine to shut down.

[0003] Currently, cooling solutions in the industry are mainly divided into two categories: independent cooling and integrated cooling. Independent cooling solutions involve separate radiators, fans, and piping for the electric drive system and the hydraulic system, with the two systems operating independently. However, the overall size is large, making it unsuitable for compact layouts. Integrated cooling solutions achieve heat dissipation through a shared fan, simplifying the structure, saving space, and reducing energy consumption. However, when adjusting the cooling intensity, it can only be done by adjusting the fan speed, which cannot achieve precise temperature control. Summary of the Invention

[0004] In view of this, this application provides a cooling system for an electric excavator and an electric excavator, in order to solve the problems existing in the current cooling solutions to a certain extent.

[0005] According to one aspect of this application, a cooling system for an electric excavator is provided, the cooling system for the electric excavator comprising: A heat dissipation module includes a heat exchange component and a cooling fan. The heat exchange component includes a first heat dissipation cavity and a second heat dissipation cavity stacked along a predetermined direction. The first heat dissipation cavity and the second heat dissipation cavity are not in communication. The cooling fan is connected to the outer wall of the heat exchange component, and the speed of the cooling fan is adjustable. A hydraulic cooling module includes a hydraulic cooling circuit, a hydraulic oil tank, a hydraulic pump, and a working hydraulic component. The two ends of the hydraulic cooling circuit are respectively connected to the first heat dissipation cavity. The hydraulic oil tank, the hydraulic pump, and the working hydraulic component are all mounted on the hydraulic cooling circuit. An electric drive cooling module includes an electric drive cooling circuit, a water pump mechanism, a controller, and a motor. The two ends of the electric drive cooling circuit are respectively connected to the second heat dissipation cavity. The motor, the controller, and the water pump mechanism are all mounted on the electric drive cooling circuit. The water pump mechanism can adjust the flow rate of the coolant passing through it.

[0006] Preferably, the cooling system for the electric excavator further includes a control module, a first temperature detector, and a second temperature detector. The first temperature detector is disposed in the hydraulic oil tank and is used to detect the temperature of the hydraulic oil to obtain a first operating temperature. ; The second temperature detector is installed on the electric drive cooling circuit, located between the controller and the water pump mechanism. The second temperature detector is used to detect the temperature of the flowing coolant to obtain a second operating temperature. ; The first temperature detector, the second temperature detector, the water pump mechanism, and the cooling fan are all communicatively connected to the control module.

[0007] Preferably, the control module can base its operation on the first operating temperature. Obtain the first speed of the cooling fan And based on the second operating temperature Obtain the second speed of the cooling fan ; The control module can control the first rotation speed. and the second rotational speed A comparison is made to control the speed of the cooling fan to maintain the first speed. and the second rotational speed The maximum of the two.

[0008] Preferably, the cooling system for the electric excavator has a digging mode and a breaking mode. When the cooling system for the electric excavator is in digging mode, the control module can control the first operating temperature. With lower limit temperature of oil and the upper limit of the first oil temperature Compare; At the first operating temperature Temperatures below the lower limit of the oil temperature At that time, the first rotational speed Equal to the preset minimum speed of the cooling fan ; At the first operating temperature Greater than or equal to the lower limit temperature of the oil And less than or equal to the first upper limit oil temperature At that time, the first rotational speed satisfy: , This is the first adjustment factor; At the first operating temperature Temperature greater than the first upper limit of oil temperature At that time, the first rotational speed Equal to the preset maximum speed of the cooling fan ; When the cooling system for the electric excavator is in crushing mode, the control module is able to control the first operating temperature. With the lower limit temperature of the oil Second oil temperature upper limit temperature Compare; At the first operating temperature Temperatures below the lower limit of the oil temperature At that time, the first rotational speed Equal to the preset minimum speed of the cooling fan ; At the first operating temperature Greater than or equal to the lower limit temperature of the oil And less than or equal to the second upper limit oil temperature. At that time, the first rotational speed satisfy: , This is the second adjustment factor; At the first operating temperature Temperature greater than the second upper limit of oil temperature At that time, the first rotational speed Equal to the preset maximum speed of the cooling fan .

[0009] Preferably, when the cooling system for the electric excavator is in digging mode, the control module is able to control the second operating temperature. Compared with the first lower limit temperature of water and upper limit of water temperature Compare; At the second operating temperature Temperature less than the first lower limit of water temperature At that time, the second rotational speed Equal to the preset minimum speed of the cooling fan ; At the second operating temperature Greater than or equal to the first lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the second rotational speed satisfy: , This is the third adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the second rotational speed Equal to the preset maximum speed of the cooling fan ; When the cooling system for the electric excavator is in crushing mode, the control module is able to control the second operating temperature. Compared with the second lower limit temperature of water and the upper limit temperature of the water Compare; At the second operating temperature Temperature less than the second lower limit of water temperature At that time, the second rotational speed Equal to the preset minimum speed of the cooling fan ; At the second operating temperature Greater than or equal to the second lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the second rotational speed satisfy: , This is the fourth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the second rotational speed Equal to the preset maximum speed of the cooling fan .

[0010] Preferably, the first upper limit temperature of the oil is... and the second upper limit oil temperature satisfy: .

[0011] Preferably, the water pump mechanism is an electronic water pump, and the rotational speed of the electronic water pump is a third rotational speed. ; The control module can control the second operating temperature. Compared with the lower limit temperature of the third water temperature and the upper limit temperature of the water Comparison to obtain the third rotational speed ; At the second operating temperature Temperature less than the lower limit of the third water temperature At that time, the third rotational speed Equal to the first preset water pump speed ; At the second operating temperature Greater than or equal to the lower limit of the third water temperature And less than or equal to the upper limit temperature of the water. At that time, the third rotational speed satisfy: , This is the fifth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the third rotational speed Equal to the maximum speed of the electronic water pump .

[0012] Preferably, the electric drive cooling module includes a cooler disposed on the electric drive cooling circuit, and the cooler includes an electric fan with a rotational speed of a fourth speed. ; The control module can control the second operating temperature. With the fourth lower limit temperature and the upper limit temperature of the water Comparison to obtain the fourth rotational speed ; At the second operating temperature Temperature less than the fourth lower limit of water temperature At that time, the fourth rotation speed Equals 0; At the second operating temperature Greater than or equal to the fourth lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the fourth rotation speed satisfy: , This is the sixth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the fourth rotation speed Equal to the maximum speed of the electric fan .

[0013] Preferably, the cooling system for the electric excavator has a slow charging mode, and when the cooling system for the electric excavator is in the slow charging mode, the control module can control the second operating temperature. Compared with the fifth lower limit temperature of water and the upper limit temperature of the water Compare; At the second operating temperature Temperature below the fifth lower limit of water temperature At that time, the third rotational speed Equal to the second preset water pump speed The fourth rotation speed Equals 0; At the second operating temperature Greater than or equal to the fifth lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the third rotational speed satisfy: , The seventh adjustment coefficient, the fourth rotational speed satisfy: , This is the eighth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the third rotational speed Equal to the maximum speed of the electronic water pump The fourth rotation speed Equal to the maximum speed of the electric fan .

[0014] According to another aspect of this application, an electric excavator is provided, the electric excavator including the cooling system described above for an electric excavator.

[0015] In the cooling system for electric excavators of this application, the first cooling chamber for the hydraulic cooling module and the second cooling chamber for the electric drive cooling module share the same cooling fan. This reduces the size of the cooling system for electric excavators to meet the requirements of a compact layout. Simultaneously, the cooling system for electric excavators includes a cooling fan and a water pump mechanism. The speed of the cooling fan is adjustable, and the coolant flow rate via the water pump mechanism is also adjustable. The linkage between the water pump mechanism and the cooling fan improves the control accuracy of oil and water temperatures, achieving precise temperature control. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A three-dimensional structural diagram of a cooling system for an electric excavator is shown from one perspective. Figure 2 A three-dimensional structural diagram of the cooling system used in an electric excavator is shown from another perspective. Figure 3The diagram shows a logic block diagram of a cooling system for an electric excavator.

[0018] Icons: 1-Heat dissipation module; 11-First heat dissipation chamber; 12-Second heat dissipation chamber; 13-Cooling fan; 2-Cooler; 21-Electric fan; 3-Water pump mechanism; 4-Working hydraulic component; 51-First temperature detector; 52-Second temperature detector; 6-Expansion tank; 7-Controller; 81-Hydraulic oil tank; 82-Hydraulic pump; 9-Motor. Detailed Implementation

[0019] The following detailed embodiments are provided to help the reader gain a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent after understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order set forth herein; changes that will be apparent after understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, for clarity and brevity, descriptions of features known in the art may be omitted.

[0020] The features described herein may be implemented in different forms and should not be construed as being limited to the examples described herein. Rather, the examples described herein have been provided merely to illustrate some of the many feasible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application.

[0021] Throughout the specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. In contrast, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between.

[0022] As used herein, the term “and / or” includes any one of the relevant items listed and any combination of any two or more items.

[0023] Although terms such as “first,” “second,” and “third” may be used herein to describe individual components, assemblies, regions, layers, or parts, these components, assemblies, regions, layers, or parts are not limited by these terms. Rather, these terms are used only to distinguish one component, assembly, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, assembly, region, layer, or part referred to as the second component, assembly, region, layer, or part may also be referred to as the second component, assembly, region, layer, or part.

[0024] For ease of description, spatial relation terms such as “above,” “upper,” “below,” and “lower” are used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relation terms are intended to include not only the orientation depicted in the drawings but also different orientations of the device during use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element. Therefore, the term “above” includes both “above” and “below” orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relation terms used herein will be interpreted accordingly.

[0025] The terminology used herein is for the purpose of describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms “comprising,” “including,” and “having” enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof.

[0026] Variations in the shapes shown in the accompanying drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the accompanying drawings, but include changes in shape that may occur during manufacturing.

[0027] The features of the examples described herein can be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible, as will be apparent upon understanding the disclosure of this application.

[0028] According to one aspect of this application, a cooling system for an electric excavator is provided, comprising a heat dissipation module 1, a hydraulic cooling module, and an electric drive cooling module, such as... Figures 1 to 3As shown, the heat dissipation module 1 includes a heat exchange component and a cooling fan 13. The heat exchange component includes a first heat dissipation cavity 11 and a second heat dissipation cavity 12 stacked along a predetermined direction. The first heat dissipation cavity 11 and the second heat dissipation cavity 12 are not connected. The cooling fan 13 is connected to the outer wall of the heat exchange component, and the speed of the cooling fan 13 can be adjusted. The hydraulic cooling module includes a hydraulic cooling circuit, a hydraulic oil tank 81, a hydraulic pump 82, and a working hydraulic component 4. Both ends of the hydraulic cooling circuit are connected to the first heat dissipation cavity 11. The hydraulic oil tank 81, the hydraulic pump 82, and the working hydraulic component 4 are all arranged on the hydraulic cooling circuit. The electric drive cooling module includes an electric drive cooling circuit, a water pump mechanism 3, a controller 7, and a motor 9. Both ends of the electric drive cooling circuit are connected to the second heat dissipation cavity 12. The motor 9, the controller 7, and the water pump mechanism 3 are all arranged on the electric drive cooling circuit. The water pump mechanism 3 can adjust the flow rate of the coolant passing through the water pump mechanism 3. In the cooling system of this application, the first heat dissipation cavity 11 for cooling the hydraulic cooling module and the second heat dissipation cavity 12 for cooling the electric drive cooling module share the same cooling fan 13. This reduces the size of the cooling system to meet the requirements of a compact layout. Simultaneously, the cooling system includes the cooling fan 13 and a water pump mechanism 3. The speed of the cooling fan 13 is adjustable, and the coolant flow rate via the water pump mechanism 3 is also adjustable. This improves the control accuracy of oil and water temperatures, enabling precise temperature control.

[0029] Preferably, the coolant is water.

[0030] Optionally, the working hydraulic component 4 is a hydraulic structure in an electric excavator, such as a hydraulic cylinder or a swing motor, and the controller 7 can be an all-in-one controller in an electric drive system.

[0031] Optionally, the heat exchange assembly may include two housings stacked in a predetermined direction and fixed by welding, bolting or other means. The two housings respectively enclose a first heat dissipation cavity 11 and a second heat dissipation cavity 12. The cooling fan 13 is fixed to the housing enclosing the first heat dissipation cavity 11 in a predetermined direction away from the housing enclosing the second heat dissipation cavity 12 by welding, bolting or other means.

[0032] Optionally, the heat exchange assembly may also include a housing and a partition plate. The partition plate is disposed inside the housing to divide the internal space of the housing into a first heat dissipation cavity 11 and a second heat dissipation cavity 12. The first heat dissipation cavity 11 and the second heat dissipation cavity 12 are respectively located on opposite sides of the partition plate in a predetermined direction. The cooling fan 13 is fixed to the outer wall of the housing by welding, bolting or other means. The cooling fan 13 is located on the side of the first heat dissipation cavity 11 opposite to the second heat dissipation cavity 12 in the predetermined direction.

[0033] In the embodiments of this application, such as Figure 1 and Figure 2As shown, the electric drive cooling module also includes a control module, a first temperature detector 51, and a second temperature detector 52. The first temperature detector 51 is installed inside the hydraulic oil tank 81, and the second temperature detector 52 is used to detect the temperature of the hydraulic oil to obtain the first operating temperature. The second temperature detector 52 is installed on the electric drive cooling circuit, located between the controller 7 and the water pump mechanism. The second temperature detector 52 is used to detect the temperature of the flowing coolant to obtain the second operating temperature. The first temperature detector 51, the second temperature detector 52, the water pump mechanism 3, and the cooling fan 13 are all communicatively connected to the control module. Thus, the control module can determine the operating temperature based on the obtained first operating temperature. Second operating temperature The speed of the water pump mechanism 3 and the cooling fan 13 is determined, thereby adjusting the flow rate of cooling air and coolant to achieve precise temperature control.

[0034] Optionally, the control module is the controller of the electric excavator vehicle.

[0035] Furthermore, the control module can base its operation on the first operating temperature. Get the first speed of cooling fan 13 And based on the second operating temperature Get the second speed of cooling fan 13 The control module can control the first rotational speed. Second speed A comparison is made to control the speed of cooling fan 13 to maintain the first speed. Second speed The maximum of the two. Thus, the control module can determine the initial operating temperature of the hydraulic oil based on the initial operating temperature of the hydraulic oil. and the second operating temperature of the coolant Determine the first rotational speed respectively Second speed And keep the speed of cooling fan 13 at the first speed. Second speed The maximum of the two values ​​is selected to ensure that the cooling fan 13 can meet the heat dissipation requirements of the hydraulic cooling module and the electric drive cooling module.

[0036] Preferably, the cooling fan 13 is a hydraulic motor fan or an electric fan.

[0037] The cooling system of this application has a digging mode and a crushing mode. When the cooling system is in digging mode, the control module can control the first operating temperature. With lower limit temperature of oil and the upper limit of the first oil temperature Compare to obtain the first rotational speed Lower limit oil temperature and the upper limit of the first oil temperature The choice can be made based on the specific circumstances of the cooling system.

[0038] Specifically, at the first operating temperature Temperature below the lower limit of oil temperature First rotational speed Equal to the preset minimum speed of cooling fan 13 ,Right now hour, ; First operating temperature Greater than or equal to the lower limit of oil temperature And less than or equal to the first upper limit oil temperature At that time, that is At that time, the first rotational speed satisfy: , The first adjustment factor is, in other words, in At that time, the first rotational speed With the first operating temperature The increase is linear. First adjustment coefficient. The specific value can be selected based on the needs, the first adjustment coefficient. Requirements: First operating temperature Greater than or equal to the lower limit of oil temperature And less than or equal to the first upper limit oil temperature At that time, the first rotational speed Always less than or equal to ,Right now hour, ; First operating temperature Temperature greater than the upper limit of the first oil temperature At that time, the first rotational speed Equal to the preset maximum speed of cooling fan 13 ,Right now hour, ; Thus, in excavation mode, the control module can base its operation on the real-time first operating temperature. Obtain the first rotational speed at this time .

[0039] Furthermore, the control module is able to set the second operating temperature. Compared with the first lower limit temperature of water and upper limit of water temperature Compare to obtain the second rotation speed First water temperature lower limit temperature and upper limit of water temperature The choice can be made based on the specific circumstances of the cooling system.

[0040] Specifically, at the second operating temperature Temperature below the first lower limit of water temperature At that time, the second rotational speed Equal to the preset minimum speed of cooling fan 13 ,Right now hour, ; Second operating temperature Greater than or equal to the first lower limit of water temperature And less than or equal to the upper limit of water temperature. At that time, that is At that time, the second rotational speed satisfy: , This is the third adjustment factor, meaning that in At that time, the second rotational speed With the second operating temperature The increase is linear. Third adjustment coefficient. The specific value can be selected based on the needs, the third adjustment coefficient. Requires meeting the following condition: at the second operating temperature Greater than or equal to the first lower limit of water temperature And less than or equal to the upper limit of water temperature. At that time, the second rotational speed Always less than or equal to That is, in hour, .

[0041] Second operating temperature Temperature greater than the upper limit of water temperature At that time, the second rotational speed Equal to the preset maximum speed of cooling fan 13 ,Right now hour, .

[0042] Thus, in digging mode, the control module can obtain the first rotational speed in real time. Second speed and the first rotational speed Second speed A comparison is made to keep the speed of cooling fan 13 at the first speed. Second speed The maximum of the two is used to meet the heat dissipation requirements in the mining mode.

[0043] Furthermore, when the cooling system is in crushing mode, the control module can set the first operating temperature. With lower limit temperature of oil Second oil temperature upper limit temperature Compare to obtain the first rotational speed Second oil temperature upper limit temperature The choice can be based on the requirements of the cooling system.

[0044] Specifically, at the first operating temperature Temperature below the lower limit of oil temperature ,Right now First speed Equal to the preset minimum speed of cooling fan 13 ,Right now , = .

[0045] First operating temperature Greater than or equal to the lower limit of oil temperature And less than or equal to the second upper limit oil temperature At that time, that is At that time, the first rotational speed satisfy: , This is the second adjustment factor, meaning that in At that time, the first rotational speed With the first operating temperature The increase is linear. The specific value can be selected based on the needs, the second adjustment coefficient. Satisfy: at the first operating temperature Greater than or equal to the lower limit of oil temperature And less than or equal to the second upper limit oil temperature At that time, the first rotational speed Always less than or equal to the preset maximum speed .Right now hour, .

[0046] First operating temperature Temperature greater than the second upper limit of oil temperature At that time, the first rotational speed Equal to the preset maximum speed of cooling fan 13 ,Right now hour, .

[0047] Meanwhile, when the cooling system is in crushing mode, the control module can set the second operating temperature. Compared with the second lower limit temperature of water and upper limit of water temperature Compare to obtain the second rotation speed Second lower limit water temperature The choice can be based on the requirements of the cooling system.

[0048] Specifically, at the second operating temperature Temperature less than the second lower limit of water temperature Second rotation speed Equal to the preset minimum speed of cooling fan 13 ,Right now hour, .

[0049] Second operating temperature Greater than or equal to the second lower limit temperature of water And less than or equal to the upper limit of water temperature. At that time, that is At that time, the second rotational speed satisfy: , This is the fourth adjustment factor, i.e. At that time, the second rotational speed With the second operating temperature The increase is linear. Fourth adjustment coefficient. The specific value can be selected based on the needs, fourth adjustment coefficient. Satisfy: at the second operating temperature Greater than or equal to the second lower limit temperature of water And less than or equal to the upper limit of water temperature. At that time, the second rotational speed Always less than the preset maximum speed ,Right now hour, .

[0050] Second operating temperature Temperature greater than the upper limit of water temperature At that time, the second rotational speed Equal to the preset maximum speed of cooling fan 13 ,Right now , .

[0051] As described above, the control module obtains the rotational speed of the cooling fan 13 based on the operating mode of the cooling system, so that the flow rate of the cooling air generated by the cooling fan 13 can meet the needs of the cooling system.

[0052] Preferably, the upper limit temperature of the first oil temperature Second oil temperature upper limit temperature satisfy: Thus, in the break mode, the cooling fan 13 will reach its preset maximum speed at a lower temperature. To avoid sudden high-temperature shocks, the cooling fan 13 reaches its preset maximum speed during digging mode. The temperature is higher to reduce unnecessary energy consumption.

[0053] It should be noted that the preset minimum speed of the cooling fan 13 mentioned above... and preset maximum speed You can select based on the actual situation and preset the maximum speed. Less than or equal to the maximum speed of cooling fan 13.

[0054] Preferably, the water pump mechanism 3 is an electronic water pump, and the rotational speed of the electronic water pump is the third rotational speed. The control module can set the second operating temperature. Compared with the lower limit temperature of the third water temperature and upper limit of water temperature Compare to obtain the third rotation speed The third lower limit temperature of water and upper limit of water temperature The specific value can be selected based on the needs of the cooling system.

[0055] Specifically, at the second operating temperature Temperature less than the lower limit of the third water temperature At that time, the third rotation speed Equal to the first preset water pump speed ,Right now , First preset water pump speed Less than the maximum speed of the electric water pump ,For example, .

[0056] Second operating temperature Greater than or equal to the lower limit of the third water temperature And less than or equal to the upper limit of water temperature. At that time, that is At that time, the third rotation speed satisfy: , It is the fifth adjustment factor, that is, in At that time, the third rotation speed With the second operating temperature The increase is linear. Fifth adjustment coefficient. Satisfy: at the second operating temperature Greater than or equal to the lower limit of the third water temperature And less than or equal to the upper limit of water temperature. The speed is always less than or equal to the maximum speed of the electric water pump. ,Right now hour, .

[0057] Second operating temperature Temperature greater than the upper limit of water temperature At that time, the third rotation speed Equal to the maximum speed of the electric water pump ,Right now hour, .

[0058] In this way, the electric water pump can adjust its speed in real time based on the coolant temperature, thereby adjusting the coolant flow rate. The dual-side linkage adjustment of the cooling fan 13 and the electric water pump can accurately match the temperature control requirements of the electric drive system and the hydraulic system, effectively preventing components from aging or malfunctioning due to high temperatures.

[0059] Alternatively, the water pump mechanism 3 can also be a combination of a fixed-displacement water pump and a proportional flow valve, through which the flow rate of the coolant can also be adjusted.

[0060] In addition, such as Figure 1 , Figure 2 and Figure 3 As shown, the electric drive cooling module includes a cooler 2, which is installed on the electric drive cooling circuit. The cooler 2 includes an electric fan 21, and the electric fan 21 rotates at a speed of four speeds. The control module can set the second operating temperature. With the fourth lower limit temperature and upper limit of water temperature Comparison to obtain the fourth rotation speed The fourth lower limit of water temperature The specific value can be selected based on the needs of the cooling system.

[0061] Specifically, at the second operating temperature Temperature below the fourth lower limit of water temperature At that time, the fourth rotation speed Equal to 0, that is, in The electric fan 21 is not working.

[0062] Second operating temperature Greater than or equal to the fourth lower limit temperature of water And less than or equal to the upper limit of water temperature. At that time, that is At that time, the fourth rotation speed satisfy: , It is the sixth adjustment factor, that is, in At that time, the fourth rotation speed With the second operating temperature The increase is linear. Sixth adjustment coefficient. The specific value can be selected based on the needs, the sixth adjustment coefficient. Satisfy: at the second operating temperature Greater than or equal to the fourth lower limit temperature of water And less than or equal to the upper limit of water temperature. At that time, the fourth rotation speed Always less than or equal to the maximum speed of the electric fan 21 ,Right now , .

[0063] Second operating temperature Temperature greater than the upper limit of water temperature At that time, the fourth rotation speed Equal to the maximum speed of electric fan 21 ,Right now hour, .

[0064] In this way, the control module can be based on the second operating temperature. The electronic fan 21 can be selected to operate and its speed can be adjusted. The electronic fan 21 can compensate for the insufficient cooling capacity of the cooling fan 13 under special working conditions and play an auxiliary role in enhancing heat dissipation.

[0065] like Figure 3 As shown, the electric drive cooling module includes an expansion tank 6, which is connected to the second heat dissipation cavity 12, the cooler 2, and the part of the electric drive cooling circuit used to connect the second heat dissipation cavity 12 and the electric water pump.

[0066] In addition, the cooling system has a slow charging mode. When the cooling system is in slow charging mode, the initial speed of the electric water pump is the second preset water pump speed. The electric fan 21 is not working. The control module is able to set the second operating temperature. Compared with the fifth lower limit temperature of water and upper limit of water temperature A comparison is made to control the operation of the electric fan 21 and the electric water pump. Fifth water temperature lower limit temperature. The specific value can be selected based on the needs of the cooling system, the second preset water pump speed. Alternatively, you can select based on your needs, such as the second preset pump speed. satisfy ,For example .

[0067] Specifically, at the second operating temperature Temperature below the fifth lower limit of water temperature At that time, the third rotation speed Equal to the second preset water pump speed Fourth rotation speed Equal to 0; that is, in At that time, the electric fan 21 is not working. .

[0068] Second operating temperature Greater than or equal to the fifth lower limit temperature of water And less than or equal to the upper limit of water temperature. At that time, that is At that time, the third rotation speed satisfy: , The seventh adjustment factor, the fourth speed. satisfy: , This is the eighth adjustment factor. That is to say, in At that time, with the second operating temperature With the increase of [variable name], the speed of both the electric water pump and the electric fan 21 increases linearly. Seventh adjustment coefficient. and the eighth adjustment factor The specific value can be determined based on the demand; the seventh adjustment coefficient. Satisfy: In hour, Eighth adjustment coefficient Satisfy: In hour, .

[0069] Second operating temperature Temperature greater than the upper limit of water temperature At that time, the third rotation speed Equal to the maximum speed of the electric water pump Fourth rotation speed Equal to the maximum speed of electric fan 21 That is, in hour, = , .

[0070] As mentioned above, the cooler 2 can work in slow charging mode, avoiding heat dissipation blind spots and ensuring the temperature stability of components such as the controller 7.

[0071] Thus, this application uses the heat dissipation module 1 to cool the hydraulic and electric drive cooling modules, simplifying the structure of the cooling system. The cooling fan 13 and water pump mechanism 3 are linked and adjusted on both sides, enabling precise matching of the temperature control requirements of the electric drive and hydraulic systems, effectively preventing component aging or failure due to high temperatures. Furthermore, different temperature control strategies are applied to the crushing, digging, and slow charging modes to adapt to the different heat generation characteristics, balancing heat dissipation effectiveness and energy efficiency.

[0072] According to another aspect of this application, an electric excavator is provided that has the same technical effects as the cooling system described above, which will not be repeated here.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cooling system for an electric excavator, characterized in that, The cooling system for the electric excavator includes: A heat dissipation module includes a heat exchange component and a cooling fan. The heat exchange component includes a first heat dissipation cavity and a second heat dissipation cavity stacked along a predetermined direction. The first heat dissipation cavity and the second heat dissipation cavity are not in communication. The cooling fan is connected to the outer wall of the heat exchange component, and the speed of the cooling fan is adjustable. A hydraulic cooling module includes a hydraulic cooling circuit, a hydraulic oil tank, a hydraulic pump, and a working hydraulic component. The two ends of the hydraulic cooling circuit are respectively connected to the first heat dissipation cavity. The hydraulic oil tank, the hydraulic pump, and the working hydraulic component are all mounted on the hydraulic cooling circuit. An electric drive cooling module includes an electric drive cooling circuit, a water pump mechanism, a controller, and a motor. The two ends of the electric drive cooling circuit are respectively connected to the second heat dissipation cavity. The motor, the controller, and the water pump mechanism are all mounted on the electric drive cooling circuit. The water pump mechanism can adjust the flow rate of the coolant passing through it.

2. The cooling system for an electric excavator according to claim 1, characterized in that, The cooling system for the electric excavator also includes a control module, a first temperature detector, and a second temperature detector. The first temperature detector is located inside the hydraulic oil tank and is used to detect the temperature of the hydraulic oil to obtain a first operating temperature. ; The second temperature detector is installed on the electric drive cooling circuit, located between the controller and the water pump mechanism. The second temperature detector is used to detect the temperature of the flowing coolant to obtain a second operating temperature. ; The first temperature detector, the second temperature detector, the water pump mechanism, and the cooling fan are all communicatively connected to the control module.

3. The cooling system for an electric excavator according to claim 2, characterized in that, The control module can be based on the first operating temperature. Obtain the first speed of the cooling fan And based on the second operating temperature Obtain the second speed of the cooling fan ; The control module can control the first rotation speed. and the second rotational speed A comparison is made to control the speed of the cooling fan to maintain the first speed. and the second rotational speed The maximum of the two.

4. The cooling system for an electric excavator according to claim 3, characterized in that, The cooling system for the electric excavator has a digging mode and a breaking mode. When the cooling system for the electric excavator is in digging mode, the control module can control the first operating temperature. With lower limit temperature of oil and the upper limit of the first oil temperature Compare; At the first operating temperature Temperatures below the lower limit of the oil temperature At that time, the first rotational speed Equal to the preset minimum speed of the cooling fan ; At the first operating temperature Greater than or equal to the lower limit temperature of the oil And less than or equal to the first upper limit oil temperature At that time, the first rotational speed satisfy: , This is the first adjustment factor; At the first operating temperature Temperature greater than the first upper limit of oil temperature At that time, the first rotational speed Equal to the preset maximum speed of the cooling fan ; When the cooling system for the electric excavator is in crushing mode, the control module is able to control the first operating temperature. With the lower limit temperature of the oil Second oil temperature upper limit temperature Compare; At the first operating temperature Temperatures below the lower limit of the oil temperature At that time, the first rotational speed Equal to the preset minimum speed of the cooling fan ; At the first operating temperature Greater than or equal to the lower limit temperature of the oil And less than or equal to the second upper limit oil temperature. At that time, the first rotational speed satisfy: , This is the second adjustment factor; At the first operating temperature Temperature greater than the second upper limit of oil temperature At that time, the first rotational speed Equal to the preset maximum speed of the cooling fan .

5. The cooling system for an electric excavator according to claim 4, characterized in that, When the cooling system for the electric excavator is in digging mode, the control module is able to control the second operating temperature. Compared with the first lower limit temperature of water and upper limit of water temperature Compare; At the second operating temperature Temperature less than the first lower limit of water temperature At that time, the second rotational speed Equal to the preset minimum speed of the cooling fan ; At the second operating temperature Greater than or equal to the first lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the second rotational speed satisfy: , This is the third adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the second rotational speed Equal to the preset maximum speed of the cooling fan ; When the cooling system for the electric excavator is in crushing mode, the control module is able to control the second operating temperature. Compared with the second lower limit temperature of water and the upper limit temperature of the water Compare; At the second operating temperature Temperature less than the second lower limit of water temperature At that time, the second rotational speed Equal to the preset minimum speed of the cooling fan ; At the second operating temperature Greater than or equal to the second lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the second rotational speed satisfy: , This is the fourth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the second rotational speed Equal to the preset maximum speed of the cooling fan .

6. The cooling system for an electric excavator according to claim 4, characterized in that, The first upper limit of oil temperature and the second upper limit oil temperature satisfy: .

7. The cooling system for an electric excavator according to claim 5, characterized in that, The water pump mechanism is an electronic water pump, and the rotational speed of the electronic water pump is a third rotational speed. ; The control module can control the second operating temperature. Compared with the lower limit temperature of the third water temperature and the upper limit temperature of the water Comparison to obtain the third rotational speed ; At the second operating temperature Temperature less than the lower limit of the third water temperature At that time, the third rotational speed Equal to the first preset water pump speed ; At the second operating temperature Greater than or equal to the lower limit of the third water temperature And less than or equal to the upper limit temperature of the water. At that time, the third rotational speed satisfy: , This is the fifth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the third rotational speed Equal to the maximum speed of the electronic water pump .

8. The cooling system for an electric excavator according to claim 7, characterized in that, The electric drive cooling module includes a cooler disposed on the electric drive cooling circuit. The cooler includes an electric fan, and the electric fan rotates at a fourth rotational speed. ; The control module can control the second operating temperature. With the fourth lower limit temperature and the upper limit temperature of the water Comparison to obtain the fourth rotational speed ; At the second operating temperature Temperature less than the fourth lower limit of water temperature At that time, the fourth rotation speed Equals 0; At the second operating temperature Greater than or equal to the fourth lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the fourth rotation speed satisfy: , This is the sixth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the fourth rotation speed Equal to the maximum speed of the electric fan .

9. The cooling system for an electric excavator according to claim 8, characterized in that, The cooling system for the electric excavator has a slow charging mode. When the cooling system for the electric excavator is in the slow charging mode, the control module can control the second operating temperature. Compared with the fifth lower limit temperature of water and the upper limit temperature of the water Compare; At the second operating temperature Temperature below the fifth lower limit of water temperature At that time, the third rotational speed Equal to the second preset water pump speed The fourth rotation speed Equals 0; At the second operating temperature Greater than or equal to the fifth lower limit temperature of water And less than or equal to the upper limit temperature of the water. At that time, the third rotational speed satisfy: , The seventh adjustment coefficient, the fourth rotational speed satisfy: , This is the eighth adjustment factor; At the second operating temperature Temperature greater than the upper limit of the water temperature At that time, the third rotational speed Equal to the maximum speed of the electronic water pump The fourth rotation speed Equal to the maximum speed of the electric fan .

10. An electric excavator, characterized in that, The electric excavator includes a cooling system for an electric excavator as described in any one of claims 1-9.

Images