A motor liquid cooling structure

Abstract

The present invention belongs to the field of motor cooling technology and provides a motor liquid cooling structure, comprising a cooling channel disposed within a housing, the cooling channel having at least one liquid inlet and at least one liquid outlet, and at least one flow divider disposed within the cooling channel, the flow divider dividing the cooling channel into at least two branch channels. The cooling channel also includes a plurality of connecting grooves disposed within the flow divider, connecting the branch channels on either side of the flow divider, with the ends of the connecting grooves connecting two regions of differing pressure. The beveled grooves in the flow divider increase the convective heat transfer area within the channel, promote fluid mixing between the different branch channels, enhance turbulence, disrupt the fluid boundary layer on the inner wall of the channel, and improve the convective heat transfer coefficient.

Description

Technical Field

[0001] The invention belongs to the technical field of motor cooling, and in particular relates to a motor liquid cooling structure. Background Art

[0002] As the power density of the motor gradually increases, the heat flux density through the flow channel also gradually increases. The heat dissipation capacity of various existing flow channels often cannot meet the heat dissipation needs of the motor.

[0003] Adding heat dissipation ribs or baffles to the flow channels around liquid-cooled motors can increase the heat exchange area within the channels, but this also reduces the flow cross-section within the channels and increases the flow resistance of the cooling medium. Adding flow-turbine structures to the flow channels around liquid-cooled motors can increase the turbulence intensity of the cooling medium in the channels and reduce the boundary layer thickness, but this also significantly increases the flow resistance.

[0004] Patent CN122063727U employs the method of adding reinforcing ribs and flow blocks to the flow channel to enhance the structural strength of the flow channel, increase the heat exchange area, and achieve turbulence of the cooling medium in the flow channel, thereby improving the heat dissipation capacity of the flow channel. However, the flow block structure significantly increases the flow resistance of the cooling medium and easily forms a significant flow dead zone in the flow channel. The cooling medium flow rate in the dead zone is extremely low, making it difficult to achieve effective convective heat exchange with the flow channel. Summary of the Invention

[0005] The purpose of the present invention is to provide a motor liquid cooling structure

[0006] The present invention provides a motor liquid cooling structure, including a cooling channel arranged in a casing, the cooling channel having at least one liquid inlet and at least one liquid outlet, at least one flow divider arranged in the cooling channel, the flow divider dividing the cooling channel into at least two branch channels, and the cooling channel also including a plurality of connecting grooves opened in the flow divider and connecting the branch channels on both sides of the flow divider, wherein the two ends of the connecting grooves connect two areas with different pressures.

[0007] Optionally, the branch channels on both sides of the flow partition are recorded as the first branch channel and the second branch channel, and the distances between the two ends of the connecting groove and the liquid inlet are different in the main flow direction of the fluid in the first branch channel and the second branch channel.

[0008] Optionally, the connecting groove is an oblique groove, and the angle between the main flow direction of the fluid in the oblique groove and the main flow direction of the fluid in the branch channel is in the range of 10° to 60°.

[0009] Optionally, the angle between the main flow direction of the fluid in the oblique groove and the main flow direction of the fluid in the branch channel is 15° to 45°.

[0010] Optionally, the connecting groove includes a left bevel groove and a right bevel groove alternately arranged along the main flow direction of the fluid in the branch channel, the pressure at the end of the left bevel groove connected to the first branch channel is lower than the pressure at the end of the left bevel groove connected to the second branch channel, and the pressure at the end of the right bevel groove connected to the first branch channel is higher than the pressure at the end of the right bevel groove connected to the second branch channel.

[0011] Optionally, the shapes of the various branch channels are the same; the cross-sectional dimensions of the various branch channels are the same; the shapes of the various connecting grooves are the same; the cross-sectional dimensions of the various connecting grooves are the same; the distances between each point on the bottom surface of the branch channel and the axis of the casing are the same; and the bottom surface of the bevel groove coincides with the bottom surface of the branch channel.

[0012] Optionally, the cross-section of each branch channel is rectangular, the width of each branch channel is the same, and the height of each branch channel is the same; the cross-section of each connecting groove is rectangular, the width of each connecting groove is the same, and the height of each connecting groove is the same.

[0013] Optionally, the liquid inlet and the liquid outlet are both arranged at the ends of the casing, and the branch channel includes alternating axial extension sections and end bending sections, the axial extension section extends from one end of the casing to the other end, and the end bending section extends along the circumference of the casing.

[0014] Optionally, the liquid inlet and the liquid outlet are respectively arranged at both ends of the housing, the branch channel is in a cylindrical spiral shape, and the axis of the cylindrical spiral line of the cold branch channel coincides with the axis of the housing;

[0015] Optionally, the liquid inlet and the liquid outlet are located at the same end of the casing, the shunt branch is symmetrical along the first radial plane, the liquid inlet and the liquid outlet are located on both sides of the first radial plane, the shunt branch includes a semi-circular segment, a transition segment and a full-circular segment, the full-circular segment extends circumferentially for nearly a circle, the full-circular segment is located at one end of the casing away from the liquid inlet and the liquid outlet, the semi-circular segment is located on one side of the first radial plane, extends circumferentially for nearly half a circle, multiple semi-circular segments are arranged along the axis of the casing, the transition segment extends along the axis of the casing, connecting two semi-circular segments or connecting a semi-circular segment and the full-circular segment, and the transition segment is arranged close to the first radial plane.

[0016] Optionally, the flow partition is integrally formed with the casing.

[0017] Optionally, the casing includes an inner shell and an outer shell arranged outside the inner shell; a flow channel groove is provided on the outer cylindrical surface of the inner shell, the outer shell has an inner cylindrical surface that matches the outer cylindrical surface of the inner shell, the liquid inlet and the liquid outlet are provided on the outer shell, and the cooling flow channel is formed by surrounding the flow channel groove and the inner cylindrical surface of the outer shell.

[0018] Optionally, the cooling channel has more than one liquid inlet.

[0019] The motor liquid cooling structure provided by the present invention increases the convection heat transfer area in the flow channel by means of the oblique grooves on the flow partition, promotes fluid mixing between different branch flow channels, enhances turbulence, destroys the fluid boundary layer on the inner wall surface of the flow channel, and improves the convection heat transfer coefficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when the axial annular flow channel is used. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when the axial annular flow channel is used. Figure 2 ;

[0022] Figure 3 It is along Figure 2 The sectional view is formed by cutting along the section line AA and projecting along the projection direction shown.

[0023] Figure 4 It is along Figure 2 The sectional view is formed by cutting along the section line BB and projecting along the projection direction shown.

[0024] Figure 5 This is a schematic diagram of the main flow direction of the fluid when the motor liquid cooling structure provided by the present invention adopts an axial annular flow channel;

[0025] Figure 6 It is a schematic diagram of the angle between the main flow direction of the fluid in the bevel groove and the main flow direction of the fluid in the cooling channel when the motor liquid cooling structure provided by the present invention adopts an axial annular flow channel.

[0026] Figure 7 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when a cylindrical spiral flow channel is used. Figure 1 ;

[0027] Figure 8 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when a cylindrical spiral flow channel is used. Figure 2 ;

[0028] Figure 9 This is a schematic diagram of the main flow direction of the fluid when the motor liquid cooling structure provided by the present invention adopts a cylindrical spiral flow channel;

[0029] Figure 10 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when it adopts a circumferential circulation type flow channel Figure 1 ;

[0030] Figure 11 This is a schematic diagram of the structure of the motor liquid cooling structure provided by the present invention when it adopts a circumferential circulation type flow channel Figure 2 ;

[0031] Figure 12 It is along Figure 11 A sectional view formed by cutting along the section line CC in FIG. 1 and projecting along the projection direction shown;

[0032] Figure 13 This is a schematic diagram of the main flow direction of the fluid when the motor liquid cooling structure provided by the present invention adopts a circumferential annular flow channel;

[0033] Explanation of Reference Numerals: 100, cooling channel; 110, branch channel; 111, first branch channel; 112, second branch channel; 113, bottom surface; 114, axially extending section; 115, end bending section; 116, semi-circumferential section; 117, transition section; 118, full-circumferential section; 120, connecting groove; 121, left oblique groove; 122, right oblique groove; 200, flow divider; 300, inner shell; A, area corresponding to the liquid inlet; B, area corresponding to the liquid outlet;

[0034] W1, branch channel width; H1, branch channel height; W2, connecting groove width; H2, connecting groove height; W3, flow divider width; H3, flow divider height; DETAILED DESCRIPTION

[0035] The present invention is described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described are only used to explain the present invention and are not intended to limit the present invention. Terms such as first and second in the text are only used to distinguish one entity (or operation) from another entity (or operation) and do not indicate any relationship or order between these entities (or operations); in addition, terms such as up, down, left, right, front, and back in the text that indicate direction or orientation only indicate relative direction or orientation, not absolute direction or orientation. In the absence of additional restrictions, the elements defined by the statement "including" do not exclude the presence of other elements in the process, method, article or device that includes the elements.

[0036] Please see Figures 1 to 13 The present invention provides a liquid cooling structure for a motor, including a cooling channel 100 disposed within a housing. The cooling channel 100 has at least one liquid inlet and at least one liquid outlet, and at least one flow divider 200 disposed within the cooling channel 100. The flow divider 200 divides the cooling channel 100 into at least two branch channels 110. The cooling channel 100 further includes a plurality of connecting grooves 120 disposed in the flow divider 200 and connecting the branch channels 110 on both sides of the flow divider 200. The two ends of the connecting grooves 120 connect two areas with different pressures.

[0037] Connecting two areas with different pressures can avoid the occurrence of dead zones, allowing part of the coolant in one branch channel 110 to continuously flow into another branch channel 110, promoting fluid mixing between different branch channels 110, enhancing turbulence, destroying the fluid boundary layer on the inner wall of the flow channel, and improving the convective heat transfer coefficient.

[0038] The drawings herein only illustrate the case where one flow divider 200 is provided to divide the cooling channel 100 into two branch channels 110 . By analogy, two flow dividers 200 may also be used to divide the cooling channel 100 into three branch channels 110 .

[0039] Please see Figures 1 to 6 As an optional embodiment, the motor liquid cooling structure adopts an axial annular flow channel, and the liquid inlet and outlet are both arranged at the ends of the casing. The branch channel 110 includes alternating axial extension sections 114 and end bending sections 115. The axial extension section 114 extends from one end of the casing to the other end, and the end bending section 115 extends along the circumference of the casing.

[0040] Please see Figures 7 to 9 As an optional embodiment, the motor liquid cooling structure adopts a cylindrical spiral flow channel, the liquid inlet and the liquid outlet are respectively arranged at the two ends of the casing, the branch channel 110 is cylindrical spiral, and the axis of the cylindrical spiral line of the cold branch channel 110 coincides with the axis of the casing.

[0041] Please see Figures 10 to 13 As an optional embodiment, the motor liquid cooling structure adopts a circumferential annular flow channel, the liquid inlet and the liquid outlet are located at the same end of the housing, and the branch channel 110 is symmetrical along the first radial plane (the first radial plane is in Figure 10 to Figure 12 The liquid inlet and the liquid outlet are located on both sides of the first radial plane. The branch channel 110 includes a semi-circular segment 116, a transition segment 117 and a full-circular segment 118. The full-circular segment 118 extends circumferentially for nearly one circle. The full-circular segment 118 is located at one end of the casing away from the liquid inlet and the liquid outlet. The semi-circular segment 116 is located on one side of the first radial plane and extends circumferentially for nearly half a circle. Multiple semi-circular segments 116 are arranged along the axis of the casing. The transition segment 117 extends along the axis of the casing, connecting two semi-circular segments 116 or connecting one semi-circular segment 116 and the full-circular segment 118. The transition segment 117 is arranged close to the first radial plane.

[0042] As an optional embodiment, the branch channels 110 on both sides of the flow partition 200 are recorded as the first branch channel 111 and the second branch channel 112, and the distances between the two ends of the connecting groove 120 and the liquid inlet are different in the main flow direction of the fluid in the first branch channel 111 and the second branch channel 112.

[0043] Please see Figure 6As an optional embodiment, the connecting groove 120 is a bevel groove, and the angle between the main flow direction of the fluid in the bevel groove and the main flow direction of the fluid in the branch channel 110 is 10° to 60°.

[0044] The main flow direction of the fluid in the bevel groove is the main flow direction of the cooling medium in the bevel groove. The main flow direction of the fluid in the branch channel is the main flow direction of the cooling medium in the branch channel.

[0045] When a flow divider 200 divides the cooling channel 100 into two branch channels 110, the main flow direction of the flow in the branch channel 110 is parallel to the intersection of the side surface of the branch channel 110 away from the flow divider 200 and the bottom surface 113. The main flow direction of the flow in the bevel groove is parallel to the intersection of the side surface of the bevel groove and the bottom surface 123 of the bevel groove.

[0046] When the branch flow channels on both sides of the flow partitioning plate 200 are substantially identical and connected to the same liquid inlet or to two substantially identical liquid inlets, a certain angle exists between the main flow direction of the fluid in the beveled groove and the main flow direction of the fluid in the branch channel 110, resulting in different distances between the two areas connected at both ends of the beveled groove and the liquid inlet, thereby generating a pressure difference between the two ends of the beveled groove.

[0047] Furthermore, the angle between the main flow direction of the fluid in the beveled groove and the main flow direction of the fluid in the branch channel 110 is 15° to 45°.

[0048] Please see Figures 1 to 13 As an optional embodiment, the connecting groove 120 includes a left bevel groove 121 and a right bevel groove 122 alternately arranged along the main flow direction of the fluid in the branch channel 110. The pressure at the end of the left bevel groove 121 connected to the first branch channel 111 is lower than the pressure at the end of the left bevel groove 121 connected to the second branch channel 112, and the pressure at the end of the right bevel groove 122 connected to the first branch channel 111 is higher than the pressure at the end of the right bevel groove 122 connected to the second branch channel 112.

[0049] If all the bevel grooves on a flow cutter are left bevel grooves or right bevel grooves, excessive flow deviation will be caused, which will cause poor local heat dissipation. This problem can be avoided by alternately arranging the left bevel groove 121 and the right bevel groove 122.

[0050] As an optional implementation, the shapes of the branch channels 110 are the same.

[0051] Furthermore, the cross-sectional dimensions of each branch channel 110 are the same.

[0052] Specifically, the widths W1 of the branch channels 110 are the same, and the heights H1 of the branch channels 110 are the same.

[0053] As an optional embodiment, the shapes of the communication grooves 120 are the same.

[0054] Furthermore, the cross-sectional dimensions of each communicating groove 120 are the same.

[0055] Specifically, the cross section of each communication groove 120 is rectangular, the width W2 of each communication groove 120 is the same, and the height H2 of each communication groove 120 is the same.

[0056] Furthermore, the distance between each point on the bottom surface 113 of the branch channel 110 and the axis of the housing is the same; that is, the bottom surfaces of the branch channels 110 are all located on the same cylindrical surface.

[0057] As an optional implementation, the bottom surface 123 of the bevel groove coincides with the bottom surface 113 of the branch channel 110 .

[0058] Specifically, the height H3 of the flow partition 200 is the same as the height H1 of the branch channel 110 .

[0059] By arranging the cooling channels more evenly, the uniformity of the motor temperature can be better improved and the overall heat dissipation efficiency can be enhanced.

[0060] As an optional embodiment, the casing includes an inner shell 300 and an outer shell arranged on the outer side of the inner shell 300; a flow channel groove is provided on the outer cylindrical surface of the inner shell 300, and the liquid inlet and the liquid outlet are provided on the outer shell. The cooling flow channel 100 is surrounded by the flow channel groove and the inner cylindrical surface of the outer shell, and the outer shell has an inner cylindrical surface that matches the outer cylindrical surface of the inner shell 300.

[0061] As an optional embodiment, the flow partition 200 is integrally formed with the casing.

[0062] As an optional embodiment, the cooling channel 100 has more than one liquid inlet.

[0063] The liquid can be forced to pass through the connecting groove 120 by setting a liquid inlet in the middle of the cooling channel, or the pressure at both ends of the connecting groove 120 can be adjusted by connecting different liquid inlets through different branch channels.

[0064] While the present invention has been described with reference to preferred embodiments, various modifications may be made and equivalent components may be substituted without departing from the scope of the present invention. In particular, the various technical features described in the various embodiments may be combined in any manner, provided no structural conflicts exist. The present invention is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A motor liquid cooling structure, characterized in that: The invention comprises a cooling channel (100) arranged in a casing, wherein the cooling channel (100) has at least one liquid inlet and at least one liquid outlet, and at least one flow divider (200) arranged in the cooling channel (100), wherein the flow divider (200) divides the cooling channel (100) into at least two branch channels (110). The cooling channel (100) further comprises a plurality of connecting grooves (120) opened on the flow divider (200) and connected to the branch channels (110) on both sides of the flow divider (200), wherein the two ends of the connecting groove (120) connect two areas with different pressures, and the connecting groove (120) is an oblique groove, and the angle between the main flow direction of the fluid in the oblique groove and the main flow direction of the fluid in the branch channel (110) is 10° to 60°.

2. The motor liquid cooling structure according to claim 1, characterized in that: The flow branch channels (110) on both sides of the flow partition (200) are recorded as a first branch channel (111) and a second branch channel (112), and the distances between the two ends of the connecting groove (120) and the liquid inlet are different in the main flow direction of the fluid in the first branch channel (111) and the second branch channel (112).

3. The motor liquid cooling structure according to claim 1 or 2, characterized in that: The angle between the main flow direction of the fluid in the oblique groove and the main flow direction of the fluid in the branch channel (110) is 15° to 45°.

4. The motor liquid cooling structure according to claim 1 or 2, characterized in that: The connecting groove (120) comprises a left bevel groove (121) and a right bevel groove (122) alternately arranged along the main flow direction of the fluid of the branch channel (110); the pressure at one end of the left bevel groove (121) connected to the first branch channel (111) is lower than the pressure at one end of the left bevel groove (121) connected to the second branch channel (112); and the pressure at one end of the right bevel groove (122) connected to the first branch channel (111) is higher than the pressure at one end of the right bevel groove (122) connected to the second branch channel (112).

5. The motor liquid cooling structure according to claim 1 or 2, characterized in that: The shapes of the branch channels (110) are the same; the cross-sectional dimensions of the branch channels (110) are the same; the shapes of the connecting grooves (120) are the same; the cross-sectional dimensions of the connecting grooves (120) are the same; the distances between each point on the bottom surface (113) of the branch channel (110) and the axis of the housing are the same; the bottom surface (123) of the beveled groove coincides with the bottom surface (113) of the branch channel (110); and the flow partition (200) is integrally formed with the housing.

6. The motor liquid cooling structure according to claim 5, characterized in that: The cross-section of each of the branch channels (110) is rectangular, the width of each of the branch channels (110) is the same, and the height of each of the branch channels (110) is the same; the cross-section of each of the connecting grooves (120) is rectangular, the width of each of the connecting grooves (120) is the same, and the height of each of the connecting grooves (120) is the same.

7. The motor liquid cooling mechanism according to claim 5, characterized in that: The liquid inlet and the liquid outlet are both arranged at the ends of the housing, and the branch channel (110) includes axial extension sections (114) and end bending sections (115) that are alternately arranged, wherein the axial extension sections (114) extend from one end of the housing to the other end, and the end bending sections (115) extend along the circumference of the housing; or, The liquid inlet and the liquid outlet are respectively arranged at two ends of the housing, the branch channel (110) is in a cylindrical spiral shape, and the axis of the cylindrical spiral line of the branch channel (110) coincides with the axis of the housing; or, The liquid inlet and the liquid outlet are located at the same end of the casing, the diversion branch (110) is symmetrical along a first radial plane, the liquid inlet and the liquid outlet are located on both sides of the first radial plane, the diversion branch (110) includes a semi-circular segment (116), a transition segment (117) and a full-circular segment (118), the full-circular segment (118) extends circumferentially close to a circle, the full-circular segment (118) is located at one end of the casing away from the liquid inlet and the liquid outlet, the semi-circular segment (116) is located on one side of the first radial plane, and extends circumferentially close to half a circle, a plurality of the semi-circular segments (116) are arranged along the axis of the casing, the transition segment (117) extends along the axis of the casing, connects two semi-circular segments (116) or connects one semi-circular segment (116) and the full-circular segment (118), and the transition segment (117) is arranged close to the first radial plane.

8. The motor liquid cooling structure according to claim 1, characterized in that: The casing comprises an inner casing (300) and an outer casing disposed outside the inner casing (300); a flow channel groove is provided on the outer cylindrical surface of the inner casing (300); the outer casing has an inner cylindrical surface that matches the outer cylindrical surface of the inner casing (300); the liquid inlet and the liquid outlet are provided on the outer casing; and the cooling flow channel (100) is surrounded by the flow channel groove and the inner cylindrical surface of the outer casing.

9. The motor liquid cooling structure according to claim 1, characterized in that: The cooling channel (100) has more than one liquid inlet.

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