Motor circular water channel structure for reducing flow resistance

Abstract

The present invention discloses a motor circular water channel structure for reducing flow resistance, comprising an inner shell and an outer shell arranged outside the motor body, the outer wall of the inner shell being evenly provided with a plurality of spiral circumferential water channels along the circumferential direction, the circumferential water channel divides the outer wall of the inner shell into a plurality of axial water channels along the axial direction, the circumferential water channel and the axial water channel are perpendicular to each other and closely fit; the outer shell is arranged outside the circumferential water channel and the axial water channel, the water inlet and the water outlet are symmetrically arranged at the same axial position on the outer shell, the water inlet and the water outlet are through holes passing through the outer shell, and correspond to the two end positions of the circumferential water channel respectively. The present invention can effectively reduce the flow resistance of the water channel under the premise of ensuring heat dissipation, and at the same time, fully utilizes the gap between the inlet and outlet flow channels, and increases the heat dissipation area of ​​the flow channel to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of water-cooled motors for electric vehicles, and in particular to a circular ring-shaped water channel structure for a motor capable of reducing flow resistance. Background Art

[0002] Water-cooled motors are most widely used in the new energy vehicle market due to their good heat dissipation. The electromagnetic effect and mechanical rotation inside the motor will directly lead to an increase in the motor temperature, thereby affecting the performance and safety stability of the motor. Therefore, a reasonable water channel structure design is very important for improving the heat dissipation of the motor. Further reducing the flow resistance of the water channel on the basis of ensuring the heat dissipation area and convection heat transfer coefficient can improve the effectiveness of heat dissipation and achieve the best heat dissipation effect. In view of this, it is necessary to optimize the existing water channel form and design a water-cooled motor that can effectively reduce the flow resistance of the water channel. Summary of the invention

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art and to provide a motor annular water channel structure for reducing flow resistance, which can effectively reduce the water channel flow resistance while ensuring heat dissipation.

[0004] To achieve the above-mentioned purpose, the circular water channel structure of the motor for reducing flow resistance designed in the present invention includes an inner shell and an outer shell arranged outside the motor body, and its special feature is that the outer wall of the inner shell is evenly provided with a plurality of spiral circumferential water channels along the circumferential direction, and the circumferential water channel divides the outer wall of the inner shell into a plurality of axial water channels along the axial direction, and the circumferential water channel and the axial water channel are vertically and tightly fitted to each other; the outer shell is arranged outside the circumferential water channel and the axial water channel, and a water inlet and a water outlet are symmetrically arranged at the same axial position on the outer shell, and the water inlet and the water outlet are through holes passing through the outer shell, respectively corresponding to the two end positions of the circumferential water channel.

[0005] Furthermore, the circumferential water channel is composed of a circular water channel and a transition circular arc water channel, and the curvature of the joints of the circular water channel and the transition circular arc water channel are the same and are located at the same position in each circle.

[0006] Furthermore, the annular water channel and the transition circular arc water channel are respectively three-quarters and one-quarter, three-fifths and two-fifths, or one-half and one-half of the circumferential water channel.

[0007] Furthermore, when the circular water channel and the transition circular arc water channel are three-quarters and one-quarter of the circumferential water channel respectively, the radial proportions are 135° and 45° respectively; when the circular water channel and the transition circular arc water channel are three-fifths and two-fifths of the circumferential water channel respectively, the radial proportions are 108° and 72° respectively; when the circular water channel and the transition circular arc water channel are both one-half of the circumferential water channel, the radial proportions are 180° and 180° respectively.

[0008] Furthermore, the circumferential water channel is arranged on the inner wall of the outer shell, and several circles of spiral circumferential water channels are evenly arranged along the circumference of the inner wall of the outer shell. The circumferential water channel divides the inner wall of the outer shell into several axial water channels along the axial direction. The outer wall of the inner shell is a smooth structure and fits the outer edge of the circumferential water channel.

[0009] Furthermore, the width of the axial water channel along the axial direction of the inner shell is 20-60 mm. The width of the circumferential water channel along the radial direction of the inner shell is 4-12 mm.

[0010] The present invention sets a circular water channel inside the motor housing and distributes it along its axial direction, and the water inlet and the water outlet are respectively located at both ends of the water channel. The cooling medium flows into the motor housing from the water inlet of the water channel, circulates through the axial flow channel, and then flows out from the water channel outlet. The heat generated by the motor is converted into the temperature rise of the cooling medium through heat conduction at the fluid-solid interface. The present invention can effectively reduce the flow resistance of the water channel while ensuring heat dissipation, and at the same time fully utilizes the gap between the inlet and outlet flow channels to maximize the heat dissipation area of ​​the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0012] Figure 2 for Figure 1 A schematic cross-sectional structure diagram of ;

[0013] Figure 3 for Figure 1 A schematic diagram of the structure of the inner shell;

[0014] Figure 4 for Figure 1 Schematic diagram of the structure of the middle and outer shell;

[0015] Figure 5 This is a simulation diagram of the movement of cooling medium in the water channel.

[0016] Figure 6 This is a simulation diagram of the cooling effect of the circular motor water channel structure.

[0017] Figure 7 This is a simulation diagram of the cooling effect of the axial I-shaped motor water channel structure.

[0018] Figure 8 This is a simulation diagram of the cooling effect of the radial I-shaped motor water channel structure.

[0019] Fig. 9 This is a simulation diagram of the cooling effect of the radial spiral waterway structure.

[0020] In the figure: inner shell 1, outer shell 2, circumferential water channel 3, circular ring water channel 3-1 and transition arc water channel 3-2, axial water channel 4, water inlet 5, water outlet 6, cooling medium 7. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] like Figure 1 to Figure 4 As shown, a circular water channel structure of a motor for reducing flow resistance proposed by the present invention comprises an inner shell 1 and an outer shell 2 arranged outside the motor body, and the outer wall of the inner shell 1 is evenly provided with a plurality of spiral circumferential water channels 3 along the circumferential direction, and the width of the circumferential water channel 3 along the radial direction of the inner shell 2 is 4 to 12 mm. The circumferential water channel 3 divides the outer wall of the inner shell 1 into a plurality of axial water channels 4 along the axial direction, and the width of the axial water channel 4 along the circumferential direction of the inner shell 2 is 20 to 60 mm. The circumferential water channel 3 and the axial water channel 4 are perpendicular to each other and closely fit. The outer shell 2 is arranged outside the circumferential water channel 3 and the axial water channel 4, and a water inlet 5 and a water outlet 6 are symmetrically arranged at the same axial position on the outer shell 2, and the water inlet 5 and the water outlet 6 are through holes passing through the shell of the outer shell 2, and correspond to the two end positions of the circumferential water channel 3 respectively. A water inlet pipe and a water outlet pipe are arranged at the positions of the water inlet 5 and the water outlet 6, which are respectively connected to the water inlet and outlet of the water channel. The water inlet pipe and the water outlet pipe are connected to the water inlet nozzle and the water outlet nozzle respectively, and the water inlet nozzle and the water outlet nozzle are connected to the controller.

[0023] The circumferential water channel 3 is composed of a circular water channel 3-1 and a transition circular arc water channel 3-2, which can minimize the angle change of the fluid medium during the reversing process, reduce the local head loss of the water channel, and thus reduce the flow resistance of the flow channel. The curvature of the splicing of the circular water channel 3-1 and the transition circular arc water channel 3-2 is the same, and they are located at the same position in each circle to maximize the use of the gap between the flow channels, increase the contact area between the cooling medium 7 and the shell, and improve the heat dissipation of the motor. The circular water channel 3-1 and the transition circular arc water channel 3-2 are three-quarters and one-quarter, or three-fifths and two-fifths, or one-half and one-half of the circumferential water channel 3, respectively. When the circular water channel and the transition arc water channel are three-quarters and one-quarter of the circumferential water channel respectively, the radial proportions are 135° and 45° respectively; when the circular water channel and the transition arc water channel are three-fifths and two-fifths of the circumferential water channel respectively, the radial proportions are 108° and 72° respectively; when the circular water channel and the transition arc water channel are both one-half of the circumferential water channel, the radial proportions are 180° and 180° respectively. On the basis of the connection between the circular water channel 3-1 and the transition arc water channel 3-2, the circumferential water channel 3 makes full use of the gap between the two ends of the flow channel and the transition arc water channel 3-2, further increasing the heat dissipation area of ​​the flow channel and improving the heat dissipation effect.

[0024] The circumferential water channel 3 can also be arranged on the inner wall of the outer shell 2. Several circles of spiral circumferential water channels 3 are evenly arranged along the circumference of the inner wall of the outer shell 2. The circumferential water channel 3 divides the inner wall of the outer shell 2 into several axial water channels 4 along the axial direction. The outer wall of the inner shell 1 is a smooth structure and fits the outer edge of the circumferential water channel 3.

[0025] The annular water channel is arranged inside the motor housing and distributed along its axial direction, and the water inlet 5 and the water outlet 6 are respectively located at both ends of the water channel. The motor water channel housing can be placed on the outside of the inner housing 1 or the inside of the outer housing 2 according to different processing techniques, and the inner and outer housings 1 form a flow channel cavity by matching. Figure 5 As shown, the cooling medium 7 flows into the motor housing from the water inlet of the water channel, circulates through the axial flow channel and then flows out from the water channel outlet. The heat generated by the motor is converted into the temperature rise of the cooling medium 7 through heat conduction at the fluid-solid interface.

[0026] By simulating a circular ring (such as Figure 6 As shown), axial I-shaped (as shown Figure 7 As shown), radial I-shaped (as Figure 8 As shown), radial spiral (as Fig. 9 The motor water channel structure (as shown in the figure) can obtain the following results. When the water channel size is similar, the circular water channel has a better cooling effect, and the flow resistance of the flow channel is about 1 / 2 of that of other types of water channels.

[0027] Comparison table of cooling effects of four water channels

[0028]

[0029] Finally, it should be noted that the above specific implementation methods are only used to illustrate the technical solution of this patent rather than to limit it. Although this patent has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that the technical solution of this patent can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of this patent, which should be included in the scope of the claims of this patent.

Claims

1. A circular ring-shaped water channel structure for reducing flow resistance of a motor, comprising an inner shell (1) and an outer shell (2) arranged outside the motor body, characterized in that: The outer wall of the inner shell (1) is evenly provided with a plurality of spiral circumferential water channels (3) along the circumferential direction. The circumferential water channel (3) divides the outer wall of the inner shell (1) into a plurality of axial water channels (4) along the axial direction. The circumferential water channel (3) and the axial water channel (4) are closely fitted to each other perpendicularly. The outer shell (2) is arranged outside the circumferential water channel (3) and the axial water channel (4). A water inlet (5) and a water outlet (6) are symmetrically provided at the same axial position on the outer shell (2). The water inlet (5) and the water outlet (6) are through holes passing through the shell of the outer shell (2), and correspond to the two end positions of the circumferential water channel (3) respectively. The circumferential water channel (3) is composed of a circular ring water channel (3-1) and a transition circular arc water channel (3-2). 2) splicing composition, the curvature of the splicing portion of the circular water channel (3-1) and the transition circular arc water channel (3-2) is the same, and the circular water channel (3-1) and the transition circular arc water channel (3-2) located at the same position in each circle are respectively three-quarters and one-quarter, or three-fifths and two-fifths, or one-half and one-half of the circumferential water channel (3); when the circular water channel (3-1) and the transition circular arc water channel (3-2) are respectively three-quarters and one-quarter of the circumferential water channel (3), the radial proportions are 135° and 45° respectively; when the circular water channel (3-1) and the transition circular arc water channel (3-2) are respectively three-fifths and two-fifths of the circumferential water channel (3), the radial proportions are 108° and 72° respectively.

2. The circular ring-shaped water channel structure for reducing flow resistance of a motor according to claim 1, characterized in that: When the annular water channel (3-1) and the transitional arc water channel (3-2) are both half of the circumferential water channel (3), the radial proportions are 180° and 180° respectively.

3. The circular ring-shaped water channel structure for reducing flow resistance of a motor according to claim 1, characterized in that: The circumferential water channel (3) is arranged on the inner wall of the outer shell (2), and a plurality of spiral circumferential water channels (3) are evenly arranged along the circumference of the inner wall of the outer shell (2). The circumferential water channel (3) divides the inner wall of the outer shell (2) into a plurality of axial water channels (4) along the axial direction. The outer wall of the inner shell (1) is a smooth structure and fits the outer edge of the circumferential water channel (3).

4. The circular ring-shaped water channel structure for reducing flow resistance of a motor according to claim 1, characterized in that: The width of the axial water channel (4) along the circumference of the inner shell (2) is 20 to 60 mm.

5. The circular ring-shaped water channel structure for reducing flow resistance of a motor according to claim 1, characterized in that: The width of the circumferential water channel (3) along the radial direction of the inner shell (2) is 4 to 12 mm.

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