A MOS tube water cooling structure and charger for on-board charger of engineering machinery

Abstract

The present invention relates to the technical field of on-board chargers, and discloses a water-cooling structure for a MOS tube of an on-board charger for engineering machinery and a charger. In the present solution, a cavity is provided inside a first heat conductive sheet, and a second heat conductive sheet is movably provided inside the cavity. During normal heat dissipation, the second heat conductive sheet is accommodated in the cavity, and the first heat conductive sheet and the second heat conductive sheet are used to cooperate in heat transfer, so that the heat generated by the MOS tube is promptly transferred to the coolant in the cooling channel, thereby realizing efficient heat dissipation of the MOS tube. When the temperature of the first heat conductive sheet is too high, the second heat conductive sheet is controlled to withdraw from the cavity, so that the first opening is opened, so that the air with a higher temperature in the cavity generates convection and heat exchange between the first opening, the second opening and the colder air outside, so as to cool the first heat conductive sheet to increase the temperature difference between the first heat conductive sheet and the MOS tube. When the temperature of the first heat conductive sheet is restored to a normal range, the second heat conductive sheet is controlled to enter the cavity again, so as to continue to realize efficient heat dissipation of the MOS tube.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle-mounted chargers, and in particular to a MOS tube water cooling structure and a charger for a vehicle-mounted charger for engineering machinery. Background Art

[0002] Construction machinery vehicles refer to construction vehicles such as aerial work platforms, loaders, boom trucks, scissor trucks, excavators, etc. Electric construction machinery vehicles are gradually becoming the mainstream choice in the market due to their advantages such as zero emissions, high efficiency and low maintenance costs; construction machinery charging piles are generally high-power DC charging piles, and the corresponding on-board charger charging power also increases accordingly. Especially when the charging power continues to increase, the heat generated inside the charger rises sharply, and the MOS tube is the electronic component with the largest heat generation in the charger. Whether the MOS tube can be cooled in time and quickly is directly related to whether the charger can work stably and reliably at high power. At present, a water cooling system is usually arranged in the charger to cool down the MOS tube and other electronic components, that is, a cooling channel is arranged in the charger, and the MOS tube is directly attached to the outer wall of the cooling channel. In order to achieve better heat conduction effect, a heat conductive sheet is sandwiched between the MOS tube and the outer wall of the cooling channel to achieve efficient heat transfer; when the charger runs at high power for a long time, the temperature of the heat conductive sheet will increase significantly (the temperature difference between the heat conductive sheet and the MOS tube decreases, resulting in a decrease in the thermal gradient between the two), which makes the heat conduction efficiency between the heat source (MOS tube) and the heat conductive sheet attenuate greatly, thereby weakening the cooling efficiency of the MOS tube, causing the temperature in the charger to rise, bringing greater safety hazards. Summary of the invention

[0003] The object of the present invention is to provide a MOS tube water cooling structure and a charger for an on-board charger for engineering machinery, which are used to solve the problem in the prior art that the cooling efficiency is reduced when the temperature of the heat conducting plate in the charger is too high.

[0004] In order to achieve the above objectives, in a first aspect, an embodiment of the present application provides a water-cooling structure of a MOS tube of an on-board charger for engineering machinery, comprising:

[0005] A cooling shell, wherein the cooling shell has a cooling channel for flowing a coolant, and the cooling shell has a liquid inlet and a liquid outlet communicated with the cooling channel;

[0006] A plurality of first heat-conducting sheets are provided, and the plurality of first heat-conducting sheets are arranged at intervals along the length direction of the cooling shell, and the first heat-conducting sheets are attached to the outer wall of the cooling shell; a cavity is provided in the first heat-conducting sheet, and the first heat-conducting sheet has a first opening and a second opening connected to the cavity and the outside; a side of the first heat-conducting sheet away from the outer wall of the cooling shell constitutes a mounting surface for mounting a MOS tube, and the MOS tube is attached to the mounting surface; and

[0007] The second heat conducting sheet is accommodated in the cavity so that the second heat conducting sheet blocks the first opening. The second heat conducting sheet can be withdrawn outward from the cavity so that the first opening is connected with the outside.

[0008] In some embodiments of the present application, one end of the cavity penetrates the first heat conductive sheet to form the first opening;

[0009] An air duct is provided in the first heat conducting plate, and at least two air ducts are provided. Both air ducts are connected to one end of the cavity away from the first opening. The two air ducts are symmetrically arranged on both sides of the cavity. The other end of the air duct passes through the first heat conducting plate to form the second opening.

[0010] In some embodiments of the present application, the MOS tube water cooling structure for an on-board charger for engineering machinery further includes a first driving member, and a plurality of the second heat conducting plates are all connected to the first driving member, and the first driving member is used to drive the second heat conducting plates to exit the cavity outward through the first opening;

[0011] The first heat conducting sheet is in contact with a temperature sensor, and the temperature sensor and the first driving member are both electrically connected to a control system.

[0012] In some embodiments of the present application, the cavity has an opening connected to the outside on a side away from the mounting surface, the first heat conductive sheet has a first direction perpendicular to the plane where the first heat conductive sheet is located, and the projection of the cavity along the first direction matches the projection of the opening along the first direction;

[0013] The side of the second heat conductive sheet facing the cooling shell is flush with the side of the first heat conductive sheet facing the cooling shell, and the corresponding area of ​​the cooling shell and the cavity is an elastic deformation zone. The second heat conductive sheet can exit the cavity from the opening along the first direction to connect the first opening with the outside world, and squeeze the elastic deformation zone to make the elastic deformation zone concave toward the cooling channel.

[0014] In some embodiments of the present application, a plurality of slots are provided on the outer wall of the cooling shell, and the plurality of slots are arranged at intervals along the length direction of the cooling shell. An elastic heat conductive member is provided in the slot, and the outer periphery of the elastic heat conductive member is fitted and connected to the inner wall of the slot to seal the slot;

[0015] The elastic heat-conducting member forms the elastic deformation zone, and the side of the elastic heat-conducting member facing the first heat-conducting plate is flush with the outer wall of the cooling shell.

[0016] In some embodiments of the present application, a projection of the elastic heat conductive member along the first direction at least covers a projection of the second heat conductive sheet along the first direction.

[0017] In some embodiments of the present application, the MOS tube water cooling structure of the on-board charger for engineering machinery further includes a second driving member, and a plurality of the second heat conductive sheets are connected to the second driving member, and the second driving member is used to drive the second heat conductive sheet to move out of the cavity along the first direction and squeeze the elastic heat conductive member;

[0018] The first heat conducting sheet is in contact with a temperature sensor, and the temperature sensor and the second driving member are both electrically connected to a control system.

[0019] In some embodiments of the present application, a cooling auxiliary channel is provided in a side wall of the cooling housing close to the first heat conducting plate, and the cooling auxiliary channel has a plurality of cooling auxiliary channels, and the cooling auxiliary channels are arranged corresponding to the first heat conducting plate;

[0020] The cooling auxiliary channel is provided with an inlet and an outlet at both ends along the length extension direction of the cooling channel, respectively. The coolant enters the cooling auxiliary channel from the cooling channel through the inlet and flows out of the cooling auxiliary channel through the outlet.

[0021] In some embodiments of the present application, the cooling auxiliary channel is provided with a guide plate at the inlet, and the guide plate is inclined along the flow direction of the coolant, from the side wall of the cooling shell away from the first heat conductive plate to the side wall close to the first heat conductive plate.

[0022] In a second aspect, an embodiment of the present application provides a charger, comprising

[0023] a casing, wherein a liquid inlet pipe and a liquid outlet pipe are provided on the casing; and

[0024] In the water-cooling structure of the MOS tube of the on-board charger for engineering machinery, the cooling shell is U-shaped, the liquid inlet pipe is connected to the liquid inlet, and the liquid outlet pipe is connected to the liquid outlet.

[0025] Compared with the prior art, the MOS tube water cooling structure and charger of the on-board charger for engineering machinery in the embodiment of the present invention have the following beneficial effects:

[0026] In this solution, a cavity is provided inside the first heat conducting sheet and a second heat conducting sheet is movably provided in the cavity. When normal heat dissipation is performed, the second heat conducting sheet is accommodated in the cavity to fill the cavity, and the first heat conducting sheet and the second heat conducting sheet cooperate to transfer heat, so as to timely transfer the heat generated by the MOS tube to the coolant in the cooling channel, thereby realizing efficient heat dissipation of the MOS tube. When the temperature of the first heat conducting sheet is too high, the second heat conducting sheet is controlled to withdraw from the cavity to the outside, so that the first opening is in an open state, so that the air with a higher temperature in the cavity passes through the first opening, the second opening and the air with a lower temperature outside. Convection and heat exchange are generated between the gases to cool the first heat conducting plate to increase the temperature difference between the first heat conducting plate and the MOS tube (improve the heat conduction efficiency between the MOS tube and the first heat conducting plate). When the temperature of the first heat conducting plate returns to a normal temperature range, the second heat conducting plate is controlled to re-enter the cavity, thereby continuing to achieve efficient heat dissipation of the MOS tube and improving the charger's ability to control its internal heat source, thereby ensuring the safety of electric engineering machinery vehicles during high-power charging and avoiding safety problems during the charging process. At the same time, it also helps the charger to operate stably for a long time and reduce the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the charger of the present invention;

[0028] Figure 2 This is a schematic diagram of the installation relationship between the cooling housing and the MOS tube of the present invention;

[0029] Figure 3 This is a schematic diagram of the MOS tube and the MOS bracket being separated according to the present invention;

[0030] Figure 4 A schematic diagram of the relative position relationship between the MOS tube and the first heat conducting sheet of the present invention;

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of the cooling housing of the first embodiment of the present invention;

[0032] Figure 6 This is a schematic diagram of the cross-sectional structure of the first heat conducting sheet according to the first embodiment of the present invention;

[0033] Figure 7 This is a schematic diagram of the second heat conducting sheet exiting from the cavity according to the first embodiment of the present invention;

[0034] Figure 8 This is a schematic diagram of the matching relationship between the first heat conducting plate and the cooling channel in the first embodiment of the present invention;

[0035] Fig. 9 This is a schematic structural diagram of a first driving member in accordance with a first embodiment of the present invention;

[0036] Fig.10 This is a schematic diagram of the state where the second heat conducting sheet exits the cavity in the first embodiment of the present invention;

[0037] Fig.11 It is a schematic diagram of the cross-sectional structure of the cooling shell of the second embodiment of the present invention;

[0038] Fig.12 This is a schematic diagram of the second heat conducting sheet withdrawing from the cavity according to the second embodiment of the present invention;

[0039] Fig.13 This is a schematic diagram of the cross-sectional structure of a cooling housing according to a second embodiment of the present invention;

[0040] Fig.14 This is a schematic structural diagram of a second driving member according to a second embodiment of the present invention;

[0041] Fig.15 This is a schematic diagram of a state in which the second heat conducting sheet of the second embodiment of the present invention exits the cavity along the first direction;

[0042] Fig.16 For the present invention Fig.13 Schematic diagram of the AA cross-section structure.

[0043] In the figure, 1, cooling shell; 11, cooling channel; 12, cooling auxiliary channel; 121, inlet; 122, outlet; 123, guide plate; 13, partition;

[0044] 2. first heat conducting sheet; 21. cavity; 22. first opening; 23. second opening; 24. airway; 25. opening;

[0045] 3. The second heat conducting sheet;

[0046] 4. first driving member; 41. first shaft; 42. first gear; 43. first rack;

[0047] 5. elastic deformation zone; 51. slot; 52. elastic heat conducting member;

[0048] 6. second driving member; 61. second shaft; 62. second gear; 63. second rack;

[0049] 7. Casing; 71. Liquid inlet pipe; 72. Liquid outlet pipe; 73. First supporting part; 74. Second supporting part;

[0050] 8. MOS tube; 81. MOS bracket; 9. Fixing spring; 10. PCB board. DETAILED DESCRIPTION

[0051] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0052] In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a hindrance to the present invention. It should be understood that the terms "first", "second", etc. are used in the present invention to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0053] The safety and reliability of the on-board charger of electric engineering vehicles are key factors in ensuring the normal operation of the vehicle and the safety of personnel. Engineering machinery charging piles are generally high-power DC charging piles, and the corresponding on-board charger's charging power is also increased accordingly. The on-board charger is a key component in the power system of electric engineering vehicles, and the heat generated inside is very large. If this heat is not conducted away in time, it will seriously affect the life and performance of the internal components. Effective heat dissipation is not only related to the normal operation of the charger, but also a necessary condition to ensure the overall performance and safety of electric engineering vehicles. Figure 1-Figure 16 As shown, in the first aspect, the embodiment of the present application proposes a water-cooling structure for a MOS tube of an on-board charger for engineering machinery, including a cooling shell 1, a cooling channel 11 for flowing coolant in the cooling shell 1, and a liquid inlet and a liquid outlet connected to the cooling channel 11. The coolant enters the cooling channel 11 from the liquid inlet under the action of an external pump body and flows out of the cooling channel 11 from the liquid outlet. During the movement of the coolant in the cooling channel 11, heat transfer is achieved; a first heat conductive sheet 2 is provided in plurality, and the plurality of first heat conductive sheets 2 are arranged at intervals along the length direction of the cooling shell 1, the first heat conductive sheet 2 is fittedly connected to the outer wall of the cooling shell 1 (bonded to the outer wall of the cooling shell 1 by gluing), and the side of the first heat conductive sheet 2 facing away from the outer wall of the cooling shell 1 constitutes a mounting surface for mounting the MOS tube 8, and the MOS tube 8 is fittedly connected to the mounting surface; as shown Figure 3 , Figure 4 , Figure 5As shown, this embodiment provides a specific structure for fitting and connecting the MOS tube 8 to the mounting surface. A first supporting portion 73 and a second supporting portion 74 are provided on the outer side of the cooling housing 1. Two first supporting portions 73 are provided. The two first supporting portions 73 are arranged at intervals (the first supporting portion 73 faces the cooling housing 1 and is fitted and connected to the outer wall of the cooling housing 1), and the second supporting portion 74 is arranged on the side of the first supporting portion 73 away from the cooling housing 1 (the second supporting portion 74 is fitted and connected to the two first supporting portions 73 away from the cooling housing 1). First, the MOS tube 8 is packaged in the MOS bracket 81 (as shown in FIG. Figure 4 As shown, the MOS tube 8 protrudes from the surface of the MOS bracket 81 toward the cooling shell 1, and the MOS bracket 81 is placed on the upper end surface of the two first support parts 73 (the two first support parts 73 are used to support the MOS bracket 81, as shown in FIG. Figure 3 As shown, a limiting protrusion is provided at the bottom of the MOS bracket 81, and limiting holes matching the limiting protrusion are provided on the upper end surfaces of the two first supporting parts 73. The limiting protrusion is inserted into the limiting hole to realize the MOS bracket being clamped on the first supporting part 73), and the pins on the MOS are plugged and fixed at a predetermined position on the PCB board 10, and then the fixing spring sheet 9 is installed on the second supporting part 74 by bolts and the fixing spring sheet 9 is pressed against the side of the MOS tube 8 away from the cooling shell 1, so as to realize the compression of the MOS tube 8 (the structure of which is not described in detail here for the prior art), and the MOS tube 8 is tightly attached to the first heat conducting sheet 2 on the outer wall of the cooling shell 1 facing the side of the cooling shell 1 (as shown in FIG. Figure 2 As shown), ensure good contact between the MOS tube 8 and the cooling shell 1, and thus complete the installation and positioning of the MOS tube 8; a cavity 21 is provided in the first heat conducting sheet 2, and the first heat conducting sheet 2 has a first opening 22 and a second opening 23 connected to the cavity 21 and the outside; and a second heat conducting sheet 3, when the second heat conducting sheet 3 is completely accommodated in the cavity 21, the second heat conducting sheet 3 blocks the first opening 22, and the second heat conducting sheet 3 can be withdrawn from the cavity 21 to the outside, at which time the first opening 22 is connected to the outside, and the first heat conducting sheet 2 and the second heat conducting sheet 3 in this solution are ceramic heat conducting sheets (having excellent thermal conductivity and good insulation performance to ensure reliable insulation between electronic components).

[0054] In the specific implementation of this embodiment, the heat generated by the MOS tube 8 during operation is transferred to the first heat conductive sheet 2 in contact with the MOS tube 8. When the coolant flows to the position of the first heat conductive sheet 2 in the cooling channel 11, the heat on the first heat conductive sheet 2 is absorbed and transferred outwardly with the circulation of the coolant. Through the cooperation of the first heat conductive sheet 2 and the coolant, the heat generated by the MOS tube 8 is discharged outwardly, and the MOS tube 8 is cooled and cooled. In normal heat dissipation, the second heat conductive sheet 3 is located in the cavity 21 and fills the space in the cavity 21, so that the first heat conductive sheet 2 is used as a solid structure to transfer heat, which can improve the heat transfer efficiency between the MOS tube 8 and the coolant. If the second heat conductive sheet 3 is not filled in the cavity 21 during normal heat dissipation and The cavity 21 is connected to the outside through the first opening 22 and the second opening 23. The heat transferred from the MOS tube 8 to the first heat conductive sheet 2 needs to be transferred again to the first heat conductive sheet 2 located on the side of the cavity 21 facing the cooling shell 1 through the air in the cavity 21. The heat transfer efficiency of the air is obviously much lower than the heat transfer efficiency of the first heat conductive sheet 2 body. Therefore, under normal heat dissipation state, the second heat conductive sheet 3 is filled in the cavity 21 (the outer periphery of the second heat conductive sheet 3 is in close contact with the inner wall of the cavity 21), so that the heat transferred from the MOS tube 8 to the first heat conductive sheet 2 can be directly transferred to the cooling shell 1 through the second heat conductive sheet 3 (the heat transfer efficiency of the second heat conductive sheet 3 is much greater than the heat transfer efficiency of the air), thereby achieving high-efficiency heat dissipation of the MOS tube 8 and improving the cooling effect.

[0055] After working for a long time, the temperature of the first heat conducting sheet 2 and the second heat conducting sheet 3 will gradually rise, resulting in a gradual decrease in the temperature difference between the first heat conducting sheet 2, the second heat conducting sheet 3 and the MOS tube 8. In the heat transfer process, the temperature difference is a key factor. The greater the temperature difference between the heat source and the heat conducting component, the stronger the heat transfer between the heat source and the heat conducting component. Conversely, the weaker the heat transfer (the existence of the temperature difference forms a thermal gradient, driving the heat to flow from the high temperature area to the low temperature area. When the temperature difference between the MOS tube 8 and the heat conducting sheet is small, the thermal gradient decreases, and the driving force of heat conduction decreases. weak, resulting in reduced heat conduction efficiency); when the temperature difference between the first heat conducting sheet 2 and the second heat conducting sheet 3 and the temperature of the MOS tube 8 is small, the efficiency of heat transfer from the MOS tube 8 to the first heat conducting sheet 2 and the second heat conducting sheet 3 is significantly reduced, so that the efficiency of heat transfer from the MOS tube 8 to the coolant through the first heat conducting sheet 2 and the second heat conducting sheet 3 is reduced to a lower level; at this time, the second heat conducting sheet 3 is controlled to withdraw from the cavity 21 to the outside, so that the first opening 22 is opened, so that the cavity 21 is connected to the outside through the first opening 22 and the second opening 23 (such as Figure 7 , Fig.10 as shown); Figure 2As shown, there is a gap between two adjacent MOS tubes 8, and the air in the gap is close to the cooling housing 1 and is maintained at a relatively low temperature (lower than the temperature of the first heat conducting sheet 2) under the action of the coolant in the cooling channel 11; Figure 5 As shown, the air in the space enclosed by the two first support portions 73 and the second support portion 74 is also close to the cooling housing 1 and is maintained at a relatively low temperature (lower than the temperature of the first heat conducting sheet 2) by the coolant in the cooling channel 11. Figure 7 As shown, when the first opening 22 is opened, the cavity 21 is connected to the outside through the first opening 22 and the second opening 23, respectively, so that it is easier to achieve heat exchange between the air with a lower temperature outside and the air with a higher temperature in the cavity 21 (used to reduce the ambient temperature in the cavity 21), and finally achieve cooling of the interior of the first heat conductive sheet 2 with a higher temperature; and because the second heat conductive sheet 3 exits from the cavity 21 to the outside (the air with a lower temperature in the external environment can also exchange heat with the second heat conductive sheet 3 with a higher temperature, thereby cooling and dissipating the second heat conductive sheet 3); when the temperature of the first heat conductive sheet 2 and the second heat conductive sheet 3 is reduced to a lower range, the second heat conductive sheet 3 is controlled to enter the cavity 21 from the outside again, and fill the cavity 21 (the first opening 22 is blocked). At this time, the first heat conductive sheet 2 and the second heat conductive sheet 3 are once again used as a whole solid structure. Since the temperature of the first heat conductive sheet 2 and the second heat conductive sheet 3 is reduced (compared with the MOS The temperature difference between the first and second heat conducting plates 2 and 3 increases, and the thermal gradient between the two increases), and the heat in the MOS tube 8 can be quickly transferred to the first heat conducting plate 2 and the second heat conducting plate 3, and then transferred to the coolant; Note: While cooling the first and second heat conducting plates 2 and 3, the flow rate of the coolant in the cooling channel 11 can be increased simultaneously. The flow rate of the coolant increases, and the heat absorbed from the first heat conducting plate 2 per unit time also increases, thereby accelerating the transfer of heat; in this solution, when the temperature difference between the heat conducting plate and the MOS tube 8 is small, the cooling of the first and second heat conducting plates 2 and 3 and the increase of the flow rate of the coolant can be performed simultaneously and the two can cooperate with each other to achieve efficient and stable heat dissipation of the MOS tube 8; so that electric engineering machinery, such as aerial work platform vehicles, loaders, boom trucks, scissor trucks, excavators and other engineering vehicles, have higher safety and reliability when performing high-power DC charging, ensuring the safe and efficient operation of electric engineering machinery vehicles.

[0056] In some embodiments of the present application, Figure 6 , Figure 7As shown, one end of the cavity 21 passes through the first heat conducting plate 2 to form a first opening 22; an air duct 24 is provided in the first heat conducting plate 2, and at least two air ducts 24 are provided. Both air ducts 24 are connected to one end of the cavity 21 away from the first opening 22, and the two air ducts 24 are symmetrically arranged on both sides of the cavity 21, and the other end of the air duct 24 passes through the first heat conducting plate 2 to form a second opening 23.

[0057] When the second heat conducting sheet 3 is accommodated in the cavity 21, Figure 6 As shown, at this time, the cavity 21 is filled with the second heat conducting sheet 3, and the first heat conducting sheet 2 and the second heat conducting sheet 3 can be used as a solid structure to realize efficient heat transfer between the MOS tube 8 and the coolant; when the temperature of the first heat conducting sheet 2 and the second heat conducting sheet 3 is too high (the temperature difference between the MOS tube 8 is small), the second heat conducting sheet 3 is withdrawn from the cavity 21, and the first opening 22 is in an open state (so that the cavity 21 is connected to the outside through the first opening 22 and the two second openings 23 respectively), so that the air with a lower temperature in the outside environment and the air with a higher temperature in the cavity 21 can generate heat convection under the action of the first opening 22 and the second opening 23, and heat exchange is generated in the convection process, so as to achieve the effect of cooling the ambient temperature in the cavity 21 (the high temperature in the cavity 21 comes from the heat in the first heat conducting sheet 2, thereby realizing the cooling of the first heat conducting sheet 2).

[0058] In some embodiments of the present application, Fig. 9 As shown, the MOS tube water cooling structure for the on-board charger of the engineering machinery further includes a first driving member 4, and the plurality of second heat conducting plates 3 are all connected to the first driving member 4. The first driving member 4 is used to drive the second heat conducting plates 3 to exit the cavity 21 through the first opening 22. This embodiment provides a specific structure of the first driving member 4, such as Figure 8 , Fig. 9 As shown, the second heat conducting sheet 3 is connected to the first rack 43. When the second heat conducting sheet 3 is accommodated in the cavity 21, the first rack 43 extends into the cavity between the two first supporting portions 73 through the first opening 22 (as shown in FIG. Figure 8As shown in the figure, one side wall of the first rack 43 is vertically slidably assembled with the outer side wall of the cooling shell 1, the first rack 43 is meshed with a first gear 42, and multiple first gears 42 are connected to a first shaft 41, and the first shaft 41 is driven by a motor (in this solution, multiple first racks 43 in a line can be driven by a first shaft 41 and a motor, thereby driving multiple second heat conducting plates 3 to withdraw from the cavity 21. The motor in this solution should be a motor with a self-locking function when power is off, so that the second heat conducting plate 3 can be positioned when the motor is not working). In the actual production process, the matching number of motors and shafts can be selected according to the arrangement position of the first heat conducting plate 2 in the cooling shell 1; the first heat conducting plate 2 is a plurality of gears 42 connected to the first shaft 41, and the first shaft 41 is driven by a motor. The heat conducting sheet 2 is in contact with a temperature sensor (the temperature sensor is PT100, which is a temperature sensing element of PT100 and is made of platinum wire. The platinum wire is in contact with the first heat conducting sheet 2 and is used to sense the temperature of the first heat conducting sheet 2). The temperature sensor and the first driving member 4 are both electrically connected to a control system. The temperature sensors in this scheme can be multiple, and each first heat conducting sheet 2 corresponds to a temperature sensor. As long as one temperature sensor detects that the temperature of the first heat conducting sheet 2 is too high, the control system controls the motor to start and drives all the second heat conducting sheets 3 to withdraw from the cavity 21 (when one of the temperature sensors detects that the temperature of the first heat conducting sheet 2 is too high, the temperatures of the remaining first heat conducting sheets 2 are also basically in a relatively high state).

[0059] In the specific implementation of this embodiment, the temperature sensor detects that the temperature of the first heat conducting sheet 2 is too high, and the control system controls the motor to start and drive the first shaft 41 to rotate according to a predetermined rotation direction and a predetermined rotation angle, and synchronously drives the plurality of second heat conducting sheets 3 to exit from the cavity 21 to the outside through the matching first gear 42 and the first rack 43. Figure 8 As shown, the second heat conducting sheet 3 is driven to withdraw from the cavity 21 from top to bottom. Figure 6 , Figure 7 As shown, the second heat conducting sheet 3 in this solution is set to a trapezoidal shape (the cavity 21 is also set to a matching shape). When the second heat conducting sheet 3 moves downward, the first opening 22 can be connected to the outside to achieve heat convection between cold and hot air. Figure 8 As shown, since the first rack 43 is slidably assembled on the outer wall of the cooling housing 1 away from the first gear 42, the movement trajectory of the second heat conducting sheet 3 can be constrained. When the temperature sensor detects that the temperature of the first heat conducting sheet 2 drops to a lower range, the control system controls the motor to rotate in the opposite direction according to a predetermined angle, driving the second heat conducting sheet 3 to enter the cavity 21 again.

[0060] In some embodiments of the present application, in order to achieve a better cooling effect on the first heat conducting sheet 2 and the second heat conducting sheet 3, the present application provides another implementation method, which is as follows: Fig.12As shown, the cavity 21 has an opening 25 communicating with the outside on the side away from the mounting surface, the first heat conductive sheet 2 has a first direction perpendicular to the plane where the first heat conductive sheet 2 is located, and the projection of the cavity 21 along the first direction matches the projection of the opening 25 along the first direction, that is, the contour of the cavity 21 is the same as the contour of the opening 25. When the second heat conductive sheet 3 is accommodated in the cavity 21, the side of the second heat conductive sheet 3 facing the cooling shell 1 is flush with the side of the first heat conductive sheet 2 facing the cooling shell 1, so that the second heat conductive sheet 3 can fit tightly with the outer wall of the cooling shell 1; as shown in FIG. Fig.11 As shown, the area corresponding to the outer wall of the cooling shell 1 and the cavity 21 is an elastic deformation zone 5 (when the elastic deformation zone 5 is squeezed, elastic deformation occurs), and the second heat conducting sheet 3 can exit the cavity 21 outward from the opening 25 along the first direction (as shown in FIG. Fig.12 , Fig.15 As shown in FIG. 2 ), when the second heat conducting sheet 3 exits the cavity 21 from the opening 25, the first opening 22 can also be opened, so that the air with a lower temperature outside and the air with a higher temperature in the cavity 21 generate heat convection and heat exchange (as shown in FIG. 2 ). Fig.12 As shown); at the same time, since the second heat conductive sheet 3 exits the cavity 21 from the opening 25 along the first direction, the elastic deformation zone 5 is squeezed and forced to be concave in the direction of the cooling channel 11, thereby increasing the contact area between the elastic deformation zone 5 and the coolant in the cooling channel 11, and the second heat conductive sheet 3 is in contact with the elastic deformation zone 5, which helps to improve the efficiency of transferring heat in the second heat conductive sheet 3 to the coolant, thereby accelerating its cooling and heat dissipation.

[0061] In the specific implementation of this embodiment, during normal heat dissipation, the second heat conducting sheet 3 is located in the cavity 21 and the second heat conducting sheet 3 is closely attached to the elastic deformation zone 5 facing the side of the cooling shell 1. When the temperature of the first heat conducting sheet 2 is too high, the second heat conducting sheet 3 is controlled to exit the cavity 21 from the opening 25 along the first direction, so that the first opening 22 is opened (such as Fig.12 As shown), at this time, the heat convection of the cold and hot air can be realized and heat exchange can be performed, which is used to cool down the inside of the first heat conductive sheet 2; at the same time, since the second heat conductive sheet 3 moves in the direction of extruding the elastic deformation zone 5, the elastic deformation zone 5 is squeezed and concave into the cooling channel 11, thereby increasing the contact area between the elastic deformation zone 5 and the coolant in the cooling channel 11, thereby improving the efficiency of heat transfer from the second heat conductive sheet 3 to the coolant, and improving the cooling effect of the second heat conductive sheet 3, as shown in FIG. Fig.15As shown, since the elastic deformation zone 5 is sunken into the cooling channel 11 (increasing the contact surface between the elastic deformation zone 5 and the coolant), a cavity is formed in the sunken zone, so that the temperature in the cavity is reduced. Since the cavity in the sunken zone is connected to the outside through the openings at the bottom and both sides caused by the sunken elastic deformation zone 5, the ambient temperature in the sunken zone is further reduced, and the cooling effect on the first heat conducting plate 2 is further improved. When the temperature of the first heat conducting plate 2 is reduced to a lower range, the second heat conducting plate 3 is controlled to enter the cavity 21 again, so that the first heat conducting plate 2 and the second heat conducting plate 3 form a solid structure, and continue to efficiently transfer heat to the MOS tube 8; since the elastic deformation zone 5 is sunken toward the cooling channel 11 to a certain extent, it will hinder the movement of the coolant in the cooling channel 11. Therefore, when the temperature of the first heat conducting plate 2 is reduced to a lower range, that is, when normal heat dissipation is performed: the second heat conducting plate 3 needs to be moved into the cavity 21, so that the elastic deformation zone 5 returns to the initial state, so as not to hinder the rapid flow of the coolant in the cooling channel 11.

[0062] In some embodiments of the present application, Fig.11 , Fig.16 As shown, a plurality of slots 51 are provided on the outer wall of the cooling shell 1, and the slots 51 penetrate the outer wall of the cooling shell 1. The plurality of slots 51 are arranged at intervals along the length direction of the cooling shell 1. An elastic heat conductive member 52 (heat conductive silicone) is provided in the slot 51. The outer periphery of the elastic heat conductive member 52 is fitted and connected to the inner wall of the slot 51 (connected by gluing) for sealing the slot 51. The elastic heat conductive member 52 is flush with the outer wall of the cooling shell 1 toward the heat conductive sheet so as to achieve a close fit with the second heat conductive sheet 3. The elastic heat conductive member 52 constitutes the elastic deformation zone 5 in this solution.

[0063] When the second heat conducting sheet 3 moves along the first direction and exits from the cavity 21, the elastic heat conducting member 52 is squeezed and forced to produce elastic deformation toward the cooling channel 11, so that the contact area between the elastic heat conducting member 52 and the coolant is increased (the originally straight elastic heat conducting member 52 is concave, so that the elastic heat conducting member 52 is divided into a straight portion corresponding to the second heat conducting sheet 3 and a deformed curved portion located around the straight portion), so that the second heat conducting sheet 3 is cooled more efficiently with the help of the coolant. Compared with the second heat conducting sheet 3 moving downward from the first opening 22 and exiting the cavity 21, a better cooling effect of the second heat conducting sheet 3 can be achieved, so that the overall solid structure composed of the first heat conducting sheet 2 and the second heat conducting sheet 3 has a higher temperature difference with the MOS tube 8.

[0064] The elastic heat conductive member 52 in the present embodiment may also be composed of a hard heat conductive plate and an elastic member connected to the outer peripheral edge of the heat conductive plate. The elastic member connected to the outer peripheral edge of the heat conductive plate is fitted and connected to the inner wall of the slot 51 to seal the slot 51. When the second heat conductive sheet 3 moves along the first direction, the heat conductive plate is squeezed and the elastic member connected between the heat conductive plate and the inner wall of the slot 51 is elastically deformed, thereby achieving an inward concave shape toward the cooling channel 11.

[0065] In some embodiments of the present application, the projection of the elastic heat conductive member 52 along the first direction at least covers the projection of the second heat conductive sheet 3 along the first direction. Since the second heat conductive sheet 3 needs to move along the first direction, the projection of the elastic heat conductive member 52 along the first direction must be larger than the projection area of ​​the second heat conductive sheet 3 along the first direction; otherwise, the second heat conductive sheet 3 cannot move along the first direction.

[0066] In some embodiments of the present application, the water-cooling structure of the MOS tube of the on-board charger for engineering machinery further includes a second driving member 6, and the plurality of second heat conducting sheets 3 are all connected to the second driving member 6, and the second driving member 6 is used to drive the second heat conducting sheet 3 to move out of the cavity 21 along the first direction and squeeze the elastic heat conducting member 52, such as Fig.13 , Fig.14 As shown, this embodiment provides a specific structure of the second driving member 6: a second rack 63 (L-shaped) is connected to the bottom of the second heat conducting sheet 3, a gear system is provided on the horizontal portion of the second rack 63, the horizontal portion of the second rack 63 extends in a direction away from the cooling shell 1, and is slidably assembled with the second support portion 74, and is used to constrain the movement trajectory of the second heat conducting sheet 3; the second rack 63 is meshed with a second gear 62, and a plurality of second gears 62 are all connected to the second shaft 61, and the second shaft 61 is driven by a motor. In the actual production process, the second driving member 6 can be arranged according to the arrangement of the first heat conducting sheet 2 on the cooling shell 1. position, and correspondingly select matching numbers of motors and shafts; the first heat conducting sheet 2 is in contact with a temperature sensor (PT100), and the motor and the temperature sensor are electrically connected to a control system; the temperature sensor can be set to multiple, and each first heat conducting sheet 2 corresponds to a temperature sensor. As long as one temperature sensor detects that the temperature of the first heat conducting sheet 2 is too high, the control system controls the motor to start and drives all the second heat conducting sheets 3 to withdraw from the cavity 21 (when one of the temperature sensors detects that the temperature of the first heat conducting sheet 2 is too high, the temperatures of the remaining first heat conducting sheets 2 are also basically in a relatively high state).

[0067] In the specific implementation of this embodiment, when the temperature sensor detects that the temperature of the first heat conducting sheet 2 is too high, the control system controls the motor to start and drives the second shaft 61 to rotate according to a predetermined rotation direction and a predetermined rotation angle, and synchronously drives the plurality of second heat conducting sheets 3 to exit outward from the cavity 21 along the first direction through the matching second gear 62 and the second rack 63 (at this time, the first opening 22 is opened, and the convection of hot and cold air flows and heat exchange are achieved under the action of the first opening 22 and the second opening 23, so as to cool the first heat conducting sheet 2), and squeezes the elastic heat conducting member 52 (in this embodiment, the shape of the second heat conducting sheet 3 is not specifically limited, and can be any shape and is set to match the cavity 21); Fig.13 As shown, since the second rack 63 moves synchronously with the second heat conducting sheet 3 in the direction of extruding the elastic heat conducting member 52, the projection of the elastic heat conducting member 52 in the first direction should at least cover the projection of the second heat conducting sheet 3 and the second rack 63 in the first direction, so that the second rack 63 and the second heat conducting sheet 3 can move synchronously along the first direction; under the action of the control system, the second heat conducting sheet 3 is driven by the motor to move a set distance along the first direction, so that the elastic heat conducting member 52 is squeezed and concave toward the cooling channel 11, so that the second heat conducting sheet 3 and the coolant in the cooling channel 11 have a larger contact area, which can improve the cooling effect of the second heat conducting sheet 3; when the temperature sensor detects that the temperature of the first heat conducting sheet 2 drops to a lower range, the control system controls the motor to rotate in the opposite direction according to a predetermined angle, driving the second heat conducting sheet 3 to re-enter the cavity 21, so that the elastic heat conducting member 52 recovers its deformation (so as not to affect the flow of coolant in the cooling channel 11).

[0068] In some embodiments of the present application, Fig.16 As shown, in this embodiment, a cooling auxiliary channel 12 (such as Fig.16As shown, a recessed area is provided in the side wall of the cooling shell 1 close to the first heat conducting plate 2 and corresponding to the first heat conducting plate 2, and a partition 13 is provided in the cooling channel 11 on the side of the recessed area away from the first heat conducting plate 2, and the upper and lower ends of the partition 13 are respectively fitted and connected with the top wall and the bottom wall of the cooling channel 11, so as to form a cooling auxiliary channel 12 between the partition 13 and the side wall of the cooling shell 1 close to the first heat conducting plate 2), and there are multiple cooling auxiliary channels 12, and the cooling auxiliary channels 12 are arranged corresponding to the first heat conducting plate 2; the cooling auxiliary channels 12 are respectively provided with an inlet 121 and an outlet 122 at both ends of the cooling auxiliary channel 12 along the length extension direction of the cooling channel 11, and the coolant enters the cooling auxiliary channel 12 from the cooling channel 11 through the inlet 121, and flows out of the cooling auxiliary channel 12 through the outlet 122. Due to the arrangement of the cooling auxiliary channel 12, the side wall of the cooling shell 1 in the area corresponding to the first heat conductive sheet 2 becomes thinner (the remaining area is still of normal thickness to ensure the structural strength of the cooling shell 1 itself), thereby effectively reducing the heat transfer distance required for the heat in the MOS tube 8 to be transferred to the coolant, thereby improving the cooling efficiency of the MOS tube 8; at the same time, since the slot 51 is arranged in the corresponding thinned area of ​​the side wall of the cooling shell 1, when the elastic heat conductive member 52 arranged in the slot 51 is slightly squeezed by the second heat conductive sheet 3, the elastic heat conductive member 5 2 is concave and enters into the cooling auxiliary channel 12 (so that the second heat conducting sheet 3 is placed on the moving path of the coolant as much as possible), and the heat in the second heat conducting sheet 3 is quickly taken away under the flushing action of the coolant flowing through the cooling auxiliary channel 12; if there is no cooling auxiliary channel 12, the side wall of the cooling shell 1 corresponding to the first heat conducting sheet 2 is thicker, and the elastic heat conducting member 52 needs to produce a greater degree of concave deformation to place the second heat conducting sheet 3 on the moving path of the coolant. Obviously, the setting of the cooling auxiliary channel 12 is more conducive to cooling the second heat conducting sheet 3.

[0069] In some embodiments of the present application, Fig.16As shown, the cooling auxiliary channel 12 is provided with a guide plate 123 at the inlet 121, and the guide plate 123 is inclined along the flow direction of the coolant, from the side wall of the cooling housing 1 away from the first heat conducting plate 2 to the side wall close to the first heat conducting plate 2 (the guide plate 123 is spaced apart from the end of the cooling housing 1 away from the first heat conducting plate 2 and the other side wall of the cooling channel 11, so that the coolant originally in the cooling channel 11 is divided into two streams at the guide plate 123); the guide plate 123 provided at the inlet 121 can make the coolant originally flowing in the cooling channel 11 be better introduced into the cooling auxiliary channel 12, so that the coolant in the cooling auxiliary channel 12 can be quickly discharged (avoiding the coolant in the cooling auxiliary channel 11 2), because the setting of the cooling auxiliary channel 12 is equivalent to adding a recessed area (corresponding to the cooling auxiliary channel 12) on the side wall of the originally straight cooling channel 11. When the coolant flows in the cooling channel 11, the flow rate of the coolant in the recessed area is obviously slower (causing the coolant to stay in this area for a longer time, resulting in a higher coolant temperature in this area), and the setting of the guide plate 123 can guide the coolant flowing in the cooling channel 11 into the cooling auxiliary channel 12, thereby improving the flow rate of the coolant in the cooling auxiliary channel 12 (avoiding the coolant flowing slowly in the cooling auxiliary channel 12, resulting in a long retention time, thereby generating heat accumulation).

[0070] In a second aspect, the present application embodiment provides a charger, including a housing 7, such as Figure 1 , Figure 2 As shown, a liquid inlet pipe 71 and a liquid outlet pipe 72 are provided on the casing 7, the liquid inlet pipe 71 is used to allow the coolant to enter the cooling channel 11 under the action of the pump body, and the liquid outlet pipe 72 is used to discharge the coolant from the cooling channel 11 to achieve the transfer of heat from the inside of the charger to the outside; and the MOS tube water-cooling structure of the on-board charger for engineering machinery in the above embodiment, the cooling shell 1 is U-shaped, the liquid inlet pipe 71 is connected to the liquid inlet, and the liquid outlet pipe 72 is connected to the liquid outlet, and a plurality of MOS tubes 8 are respectively attached and connected to the two outer side walls of the cooling shell 1, and the inner area of ​​the cooling shell 1 is used to place electronic components such as transformers and inductors, and the above electronic components are cooled and cooled.

[0071] In summary, the embodiment of the present invention provides a water-cooling structure of a MOS tube of an on-board charger for engineering machinery and a charger. In this solution, a cavity 21 is provided inside the first heat conductive sheet 2 and a second heat conductive sheet 3 is movably provided inside the cavity 21. When normal heat dissipation is performed, the second heat conductive sheet 3 is accommodated in the cavity 21 to fill the cavity 21, and the first heat conductive sheet 2 and the second heat conductive sheet 3 are used to cooperate in heat transfer to transfer the heat generated by the MOS tube 8 to the coolant in the cooling channel 11 in a timely manner, so as to achieve efficient heat dissipation of the MOS tube 8. When the temperature of the first heat conductive sheet 2 is too high, the second heat conductive sheet 3 is controlled to cool the MOS tube 8 to the cooling channel 11. The sheet 3 withdraws from the cavity 21 to the outside, so that the first opening 22 is in an open state, so that the air with a higher temperature in the cavity 21 generates convection and heat exchange with the colder air outside through the first opening 22 and the second opening 23, which is used to cool the first heat-conducting sheet 2 to increase the temperature difference between the first heat-conducting sheet 2 and the MOS tube 8 (improve the heat conduction efficiency between the MOS tube 8 and the first heat-conducting sheet 2). When the temperature of the first heat-conducting sheet 2 returns to a normal temperature range, the second heat-conducting sheet 3 is controlled to enter the cavity 21 again, so as to continue to achieve efficient heat dissipation of the MOS tube 8. In order to further improve the cooling efficiency of the MOS tube 8, in this solution, a cooling auxiliary channel 12 is arranged in the side wall of the cooling shell 1 and the MOS corresponding area. The coolant can flow from the cooling channel 11 into the cooling auxiliary channel 12 and finally merge into the cooling channel 11 again. Due to the arrangement of the cooling auxiliary channel 12, the side wall of the cooling shell 1 and the MOS tube 8 corresponding area is thinner, thereby making the distance between the MOS tube 8 and the coolant closer, effectively reducing the intermediate heat transfer distance, further improving the heat transfer efficiency, and increasing the temperature reduction and cooling efficiency of the MOS tube 8.

[0072] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A water-cooling structure for MOS tubes of an on-board charger for engineering machinery, characterized in that: include: A cooling shell (1), wherein the cooling shell (1) has a cooling channel (11) for allowing a coolant to flow, and the cooling shell (1) has a liquid inlet and a liquid outlet communicated with the cooling channel (11); A plurality of first heat-conducting sheets (2) are provided, and the plurality of first heat-conducting sheets (2) are arranged at intervals along the length direction of the cooling shell (1), and the first heat-conducting sheets (2) are closely connected to the outer wall of the cooling shell (1); a cavity (21) is provided in the first heat-conducting sheet (2), and the first heat-conducting sheet (2) has a first opening (22) and a second opening (23) connected to the cavity (21) and the outside; a side of the first heat-conducting sheet (2) facing away from the outer wall of the cooling shell (1) forms a mounting surface for mounting a MOS tube (8), and the MOS tube (8) is closely connected to the mounting surface; as well as The second heat conducting sheet (3) is accommodated in the cavity (21), so that the second heat conducting sheet (3) blocks the first opening (22); the second heat conducting sheet (3) can be withdrawn outward from the cavity (21), so that the first opening (22) is connected to the outside.

2. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 1 is characterized in that: One end of the cavity (21) passes through the first heat conducting sheet (2) to form the first opening (22); An air channel (24) is provided in the first heat conducting plate (2), and at least two air channels (24) are provided. Both of the two air channels (24) are connected to one end of the cavity (21) away from the first opening (22). The two air channels (24) are symmetrically arranged on both sides of the cavity (21), and the other end of the air channel (24) passes through the first heat conducting plate (2) to form the second opening (23).

3. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 2 is characterized in that: The engineering machinery vehicle charger MOS tube water cooling structure further comprises a first driving member (4), a plurality of the second heat conducting plates (3) are all connected to the first driving member (4), and the first driving member (4) is used to drive the second heat conducting plates (3) to exit the cavity (21) through the first opening (22); The first heat conducting sheet (2) is in contact with a temperature sensor, and the temperature sensor and the first driving member (4) are both electrically connected to a control system.

4. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 2 is characterized in that: The cavity (21) has an opening (25) communicating with the outside on a side facing away from the mounting surface, the first heat conducting plate (2) has a first direction perpendicular to the plane on which the first heat conducting plate (2) is located, and a projection of the cavity (21) along the first direction matches a projection of the opening (25) along the first direction; The side of the second heat conductive sheet (3) facing the cooling shell (1) is flush with the side of the first heat conductive sheet (2) facing the cooling shell (1); the corresponding area between the cooling shell (1) and the cavity (21) is an elastic deformation zone (5); the second heat conductive sheet (3) can be withdrawn from the cavity (21) outwardly from the opening (25) along the first direction, so that the first opening (22) is connected to the outside, and the elastic deformation zone (5) is squeezed to make the elastic deformation zone (5) concave toward the cooling channel (11).

5. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 4 is characterized in that: The outer wall of the cooling shell (1) is provided with a plurality of slots (51), the plurality of slots (51) are arranged at intervals along the length direction of the cooling shell (1), an elastic heat-conducting member (52) is provided in the slot (51), the outer periphery of the elastic heat-conducting member (52) is fitted and connected with the inner wall of the slot (51), and is used to seal the slot (51); The elastic heat-conducting member (52) forms the elastic deformation zone (5), and the side of the elastic heat-conducting member (52) facing the first heat-conducting plate (2) is flush with the outer wall of the cooling shell (1).

6. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 5 is characterized in that: The projection of the elastic heat-conducting member (52) along the first direction at least covers the projection of the second heat-conducting sheet (3) along the first direction.

7. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 6 is characterized in that: The engineering machinery vehicle charger MOS tube water cooling structure further comprises a second driving member (6), a plurality of the second heat conducting plates (3) are all connected to the second driving member (6), and the second driving member (6) is used to drive the second heat conducting plates (3) to move out of the cavity (21) along the first direction and squeeze the elastic heat conducting member (52); The first heat conducting sheet (2) is in contact with a temperature sensor, and the temperature sensor and the second driving member (6) are both electrically connected to a control system.

8. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 4 is characterized in that: The cooling housing (1) has a cooling auxiliary channel (12) in a side wall close to the first heat conducting plate (2), the cooling auxiliary channel (12) has a plurality of cooling auxiliary channels (12), and the cooling auxiliary channels (12) are arranged corresponding to the first heat conducting plate (2); The cooling auxiliary channel (12) is provided with an inlet (121) and an outlet (122) at both ends along the length extension direction of the cooling channel (11), respectively; the coolant enters the cooling auxiliary channel (12) from the cooling channel (11) through the inlet (121) and flows out of the cooling auxiliary channel (12) through the outlet (122).

9. The water cooling structure of the MOS tube of the on-board charger for engineering machinery according to claim 8 is characterized in that: The cooling auxiliary channel (12) is provided with a guide plate (123) at the inlet (121), and the guide plate (123) is arranged along the flow direction of the coolant, inclined from a side wall of the cooling shell (1) away from the first heat conducting plate (2) to a side wall close to the first heat conducting plate (2).

10. A charger, characterized in that: include: A casing (7), wherein a liquid inlet pipe (71) and a liquid outlet pipe (72) are provided on the casing (7); as well as The MOS tube water-cooling structure for an on-board charger for engineering machinery as described in any one of claims 1 to 9, wherein the cooling shell (1) is U-shaped, the liquid inlet pipe (71) is connected to the liquid inlet, and the liquid outlet pipe (72) is connected to the liquid outlet.

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