Coolant distribution device

Abstract

The present invention relates to a coolant distribution device. The present invention provides a coolant distribution device including a housing including a coolant inflow hole, first and second coolant outflow holes; a first movable element movably disposed in a first receiving hole of the housing; a first elastic element for engaging with the first movable element; a second movable element movably disposed in a second receiving hole of the housing; and a second elastic element for engaging with the second movable element. When a rotational speed of the coolant distribution device is less than or equal to a predetermined rotational speed, the first movable element is maintained in a position to close the first coolant outflow hole and the second movable element is maintained in a position to open the second coolant outflow hole. When the rotational speed of the coolant distribution device is greater than the predetermined rotational speed, the first movable element is moved to a position to open the first coolant outflow hole under the action of centrifugal force and the second movable element is moved to a position to close the second coolant outflow hole under the action of centrifugal force.

Description

Technical Field

[0001] This invention relates to the field of cooling technology. More specifically, this invention relates to the field of cooling technology for electric motors. Background Technology

[0002] Motors generate a significant amount of heat during operation, requiring effective cooling to ensure normal operation. Currently, oil cooling is a commonly used method in motor rotor cooling technology. This method involves directing coolant axially through coolant channels within the rotor. The rotor comprises multiple rotor laminations, and the coolant channels are formed by the combination of guide holes in each rotor lamination.

[0003] However, this cooling structure has the following technical problems: when the motor is running at high speed, due to centrifugal force and the gaps between the rotor laminations, the coolant will leak radially into the outside of the rotor. Specifically, during high-speed motor operation, the centrifugal force acting on the coolant will push the cooling oil through the gaps between the rotor laminations, causing the coolant to leak into the air gap between the outer surface of the rotor and the inner surface of the stator. This coolant leakage will reduce the cooling effect and reduce motor efficiency.

[0004] Therefore, a coolant distribution device that can effectively solve the above problems is needed. Summary of the Invention

[0005] One object of the present invention is to provide a coolant distribution device that can prevent or reduce coolant leakage from the rotor to the outer surface of the rotor. Another object of the present invention is to provide a coolant distribution device that can improve the cooling efficiency of an electric motor. Yet another object of the present invention is to provide a coolant distribution device that can improve the operating efficiency of an electric motor.

[0006] One aspect of the present invention provides a coolant distribution device for being torsionally connected to a rotor and rotating about a rotation axis located outside the coolant distribution device. The coolant distribution device includes: a housing including a coolant inlet hole, a first coolant outlet hole, and a second coolant outlet hole, wherein the first coolant outlet hole and the second coolant outlet hole are respectively configured to be in fluid communication with the coolant inlet hole; a first movable element radially movably disposed in a first receiving hole of the housing for controlling the opening and closing of the first coolant outlet hole; a first elastic element for engaging with the first movable element and applying an elastic force to the first movable element; and a second movable element radially movably disposed in a second receiving hole of the housing for controlling the second coolant outlet hole. The device includes a first movable element for opening and closing the first coolant outlet, and a second elastic element for engaging with the second movable element and applying an elastic force to the second movable element. When the rotational speed of the coolant distribution device is less than or equal to a predetermined rotational speed, the first movable element remains in a position where the first coolant outlet is closed under the action of the first elastic element, and the second movable element remains in a position where the second coolant outlet is open under the action of the second elastic element. Furthermore, when the rotational speed of the coolant distribution device is greater than the predetermined rotational speed, the first movable element moves to a position where the first coolant outlet is open under the action of centrifugal force, overcoming the elastic force of the first elastic element, and the second movable element moves to a position where the second coolant outlet is closed under the action of centrifugal force, overcoming the elastic force of the second elastic element.

[0007] According to an embodiment of the present invention, the outlet of the first coolant outlet hole is located at the first axial end of the coolant distribution device, and the outlet of the second coolant outlet hole is located at the second axial end of the coolant distribution device.

[0008] According to an embodiment of the present invention, the coolant distribution device has a first radial side and a second radial side, the first radial side being closer to the axis of rotation than the second radial side, and the inlet of the coolant inflow hole is provided on the first radial side of the coolant distribution device.

[0009] According to an embodiment of the present invention, the inlet of the first coolant outlet hole is disposed in the first receiving hole, and the first coolant outlet hole is configured to be in fluid communication with the coolant inlet hole via the first receiving hole.

[0010] According to an embodiment of the present invention, the diameter of the smallest inscribed circle of the inlet of the first receiving hole is smaller than the diameter of the largest circumscribed circle of the first movable element, and the first movable element is configured to mate with the shape of the inlet of the first receiving hole.

[0011] According to an embodiment of the present invention, the first movable element is a sphere, and the inlet of the first receiving hole has a circular cross-section.

[0012] According to an embodiment of the present invention, the second coolant outlet hole is configured to intersect with and pass through the second receiving hole; and the opening of the second coolant outlet hole at the intersection with the second receiving hole is configured to fit the shape of the second movable element.

[0013] According to an embodiment of the present invention, the second movable element includes a sliding portion and a groove portion successively distributed along its moving direction, wherein the sliding portion is configured to fit the shape of the inner wall of the second receiving hole, and wherein the groove portion is configured to be in fluid communication with the second coolant outflow hole when the second movable element is in the position of opening the second coolant outflow hole.

[0014] According to an embodiment of the present invention, the sliding portion of the second movable element has a generally cylindrical shape, and wherein one of the sliding portion and the second receiving hole includes a key, and the other includes a keyway that engages with the key.

[0015] According to an embodiment of the present invention, a first elastic element is disposed in a first receiving hole and is configured to be closer to the second radial side than a first movable element; and / or a second elastic element is disposed in a second receiving hole and is configured to be closer to the second radial side than a second movable element.

[0016] According to an embodiment of the present invention, the coolant distribution device achieves dynamic control of the coolant flow direction through the coordinated action of the first and second moving elements, effectively improving cooling efficiency and preventing coolant leakage. During low-speed rotation, the first coolant outlet is closed, and the second coolant outlet is open, allowing coolant to flow through the second outlet to the rotor's coolant channel, thus effectively cooling the rotor. During high-speed rotation, the first coolant outlet is open, and the second coolant outlet is closed, allowing coolant to flow out through the first outlet, avoiding the risk of coolant leakage from the lamination gaps during high-speed rotation. This dynamically switching cooling method adaptively adjusts the coolant path according to the rotational speed, significantly improving the reliability and efficiency of the cooling system. This design utilizes the characteristics of centrifugal force and elastic elements to achieve automatic switching of the coolant outlet, eliminating the need for additional electronic control systems, resulting in a simple structure and high reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cooling path of the rotor of an electric motor.

[0018] Figure 2 This is a schematic diagram of a motor according to an embodiment of the present invention.

[0019] Figure 3 yes Figure 2 The diagram shows a partially enlarged view of the motor.

[0020] Figure 4This is an exploded view of a coolant distribution device according to an embodiment of the present invention.

[0021] Figure 5 This is a cross-sectional schematic diagram of a coolant distribution device according to an embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of a coolant flow path of a coolant distribution device according to an embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of another coolant flow path of the coolant distribution device according to an embodiment of the present invention. Detailed Implementation

[0024] Hereinafter, embodiments of the invention are described with reference to the accompanying drawings. The following detailed description and drawings are provided to exemplify the principles of the invention, which is not limited to the described preferred embodiments; the scope of the invention is defined by the claims. The invention is now described in detail with reference to exemplary embodiments, some of which are illustrated in the accompanying drawings. The following description is made with reference to the accompanying drawings, and unless otherwise indicated, the same reference numerals in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all aspects of the invention. Rather, these embodiments are merely examples of systems and methods related to various aspects of the invention as covered in the appended claims.

[0025] Figure 1 This is a schematic diagram of the cooling path for the rotor of an electric motor. (For example...) Figure 1 As shown, the motor includes a rotating shaft 1, a rotor 2, and a balance plate 3. The rotor 2 and the balance plate 3 are torsionally mounted on the rotating shaft 1. The rotating shaft 1 is a hollow shaft and includes a radially extending and penetrating inlet hole 1'. Coolant can flow into the rotating shaft 1 to cool the rotor. The rotor 2 includes a plurality of rotor laminations 2' arranged adjacent to each other along the axial direction. Each rotor lamination 2' includes an axially penetrating liquid guide hole, whereby the liquid guide holes of the plurality of rotor laminations 2' constitute a coolant channel 2' located in the rotor 2. The balance plate 3 is disposed on both axial sides of the rotor 2. The balance plate 3 includes a coolant tank with an opening facing the rotor 2, and the coolant tank is in fluid communication with the coolant channel 2' of the rotor 2.

[0026] Figure 1 The middle arrow indicates the flow path of the coolant. When the rotating shaft 1, rotor 2, and balance plate 3 rotate, the coolant in the inner cavity of the rotating shaft 1 can flow through the inlet hole 1' into the coolant tank of the balance plate 3, then enter the coolant channel 2" of the rotor 2 to cool the rotor 2, and then flow out through the coolant tank of another balance plate 3, as shown in the image. Figure 1 As indicated by the solid arrow in the middle.

[0027] However, due to the gaps between the rotor laminations 2', when the rotor 2 rotates at high speed, the coolant entering the coolant channel 2' of the rotor 2 will, under the action of centrifugal force, enter the gaps between the rotor laminations 2', and further leak out to the outside of the rotor 2 along these gaps, such as into the air gap between the rotor 2 and the stator. Figure 1 As indicated by the dashed arrow. This type of coolant leakage will cause a decrease in motor efficiency and reduce cooling effectiveness.

[0028] To address the aforementioned problems, this invention proposes an innovative coolant distribution device for rotating shafts. The coolant distribution device according to embodiments of the invention is particularly suitable for use in electric motors.

[0029] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. Figure 2 This is a schematic diagram of a motor according to an embodiment of the present invention. Figure 3 yes Figure 2 The diagram shows a partially enlarged view of the motor. Figure 4 This is an exploded view of a coolant distribution device according to an embodiment of the present invention. Figure 5 This is a cross-sectional schematic diagram of a coolant distribution device according to an embodiment of the present invention. Figure 6 This is a schematic diagram of a coolant flow path of a coolant distribution device according to an embodiment of the present invention. Figure 7 This is a schematic diagram of another coolant flow path of the coolant distribution device according to an embodiment of the present invention.

[0030] According to embodiments of the present invention, such as Figure 2 As shown, the motor includes a coolant distribution device 100, a rotating shaft 200, a rotor 300, and a balance plate 400.

[0031] The rotating shaft 200 is a hollow shaft, including an inner cavity 210 and a liquid inlet 220 extending radially from the inner cavity 210 to the outer surface of the rotating shaft 200. The rotor 300 includes a plurality of rotor laminations 310 arranged adjacent to each other along the axial direction. Each rotor lamination 310 is provided with a liquid guiding hole extending along the axial direction, which forms a coolant channel 320 located inside the rotor 300. Balance plates 400 are disposed on both axial sides of the rotor 300 and are torsionally connected to the rotor 300. The balance plates 400 include coolant grooves 410 opening towards the rotor 300, which are in fluid communication with the liquid inlet 220 of the rotating shaft 200.

[0032] According to an embodiment of the present invention, the coolant distribution device 100 is torsionally connected to the rotor 300 and is rotatable about a rotation axis A. The rotation axis A is also the rotation axis of the rotor 300. Therefore, the rotational speed of the coolant distribution device 100 is the same as the rotational speed of the rotor 300. Figure 2As shown, the rotation axis A of the coolant distribution device 100 is located outside the coolant distribution device 100. In an exemplary embodiment, the coolant distribution device 100 is torsionally connected to the balance plate 400, thereby being torsionally connected to the rotor 300 via the balance plate 400.

[0033] According to embodiments of the present invention, such as Figures 3 to 5 As shown, the coolant distribution device 100 includes a housing 10, a first movable element 20, a first elastic element 30, a second movable element 40, and a second elastic element 50.

[0034] According to an embodiment of the present invention, the housing 10 includes a coolant inlet hole 11, a first coolant outlet hole 12, and a second coolant outlet hole 13. The first coolant outlet hole 12 and the second coolant outlet hole 13 are in fluid communication with the coolant inlet hole 11, thereby forming an internal coolant flow channel in the housing 10. The coolant inlet hole 11 is used to introduce coolant into the housing 10. The first coolant outlet hole 12 is used to supply coolant to the rotor 300 during low-speed rotation, while the second coolant outlet hole 13 is used to discharge coolant during high-speed rotation.

[0035] The coolant inlet hole 11 is in fluid communication with the inlet hole 220 of the rotating shaft 200, such as... Figure 3 As shown. In an exemplary embodiment, as Figure 4 As shown, the coolant inlet 11 is in fluid communication with the coolant tank 410 of the balance plate 400, and the coolant flows through the coolant tank 410 to the inlet 220 of the rotating shaft 200 (as shown). Figure 2 (As shown) fluid connectivity.

[0036] According to an embodiment of the present invention, the outlet of the first coolant outlet 12 is located at one axial end of the coolant distribution device 100, and the outlet of the second coolant outlet 13 is located at the other axial end of the coolant distribution device 100. In an exemplary embodiment, as shown... Figure 2 As shown, the outlet of the first coolant outlet hole 12 is located at one axial end of the coolant distribution device 100 exposed from the rotor 300, and the outlet of the second coolant outlet hole 13 is located at the other axial end of the coolant distribution device 100 located inside the rotor 300.

[0037] According to embodiments of the present invention, such as Figure 2 As shown, the housing 10 has a first radial side near the axis of rotation A and a second radial side away from the axis of rotation A. The inlet of the coolant inlet hole 11 is located on the first radial side of the housing 10, as shown below. Figure 3 As shown.

[0038] In some embodiments, such as Figures 3 to 5As shown, the first coolant outlet 12 is in fluid communication with the coolant inlet 11 via a portion of the second coolant outlet 13. However, it should be understood that the invention is not limited thereto. In some embodiments, the first coolant outlet 12 may be in direct fluid communication with the coolant inlet 11.

[0039] The coolant distribution device of the present invention has a dynamic coolant distribution mechanism to adapt to different rotation speeds. According to an embodiment of the present invention, the first movable element 20 and the second movable element 40 are respectively used to control the opening and closing states of the first coolant outlet hole 12 and the second coolant outlet hole 13.

[0040] When the rotational speed of the rotor 200 and the coolant distribution device 100 is less than or equal to a predetermined rotational speed (i.e., low-speed rotation), the first movable element 20 remains in the position of closing the first coolant outlet hole 12 and the second movable element 40 remains in the position of opening the second coolant outlet hole 13. Thus, coolant can be distributed through the second coolant outlet hole 13 into the coolant passage 320 of the rotor 300 to cool the rotor 300. Figure 3 and Figure 6 As indicated by the dashed arrow.

[0041] When the rotational speed of the rotor 200 and the coolant distribution device 100 exceeds a predetermined rotational speed (i.e., high-speed rotation), the first movable element 20 remains in the position where the first coolant outlet hole 12 is open and the second movable element 40 remains in the position where the second coolant outlet hole 13 is closed, thereby allowing coolant to flow out to the outside through the first coolant outlet hole 12 (e.g., Figure 7 (As indicated by the dashed arrow) and will not enter the coolant passage 320 of the rotor 300, so as to prevent the coolant from leaking from the gap between the rotor laminations 210 to the outside of the rotor 300 when rotating at high speed.

[0042] The specific structure of the coolant distribution device 100 according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0043] First, the opening and closing of the first coolant outlet hole 12 by the first active element 20 will be described.

[0044] According to an embodiment of the present invention, a first movable element 20 is radially movably disposed in a first receiving hole 14 of the housing 10, and a first elastic element 30 engages with the first movable element 20 to apply an elastic force to the first movable element 20. More specifically, the first elastic element 30 can apply an elastic force to the first movable element 20 toward a first radial side. In an exemplary embodiment, as... Figures 3 to 5As shown, both the first movable element 20 and the first elastic element 30 are disposed in the first receiving hole 14, and the first elastic element 30 is disposed closer to the second radial side of the housing 10 than the first movable element 20, thereby allowing the first elastic element 30 to apply a pushing force to the first movable element 20. In an exemplary embodiment, the first elastic element 30 is a spring, particularly a compression spring. However, it should be understood that the invention is not limited thereto. In some embodiments, the first elastic element 30 is disposed closer to the first radial side of the housing 10 than the first movable element 20, thereby allowing the first elastic element 30 to apply a pulling force to the first movable element 20.

[0045] In an exemplary embodiment, such as Figures 3 to 5 As shown, the inlet of the first coolant outlet hole 12 is disposed within the first receiving hole 14, and the first coolant outlet hole 12 is in fluid communication with the coolant inlet hole 11 via the first receiving hole 14. Thus, the first movable element 20 can control the opening and closing of the first coolant outlet hole 12 within the first receiving hole 14. In some embodiments, the inlet 14A of the first receiving hole 14 is closer to the first radial side of the housing 10 than the inlet 12A of the first coolant outlet hole 12.

[0046] In some embodiments, the inlet 14A of the first receiving hole 14 is designed to confine the first movable element 20 within the first receiving hole 14. Thus, when the rotational speed of the rotor 300 and the coolant distribution device 100 is less than or equal to a predetermined rotational speed, the first movable element 20 is held at the inlet 14A of the first receiving hole 14 by the action of the first elastic element 30, and cannot disengage from the first receiving hole 14.

[0047] In an exemplary embodiment, the first movable element 20 is a sphere, and the inlet 14A of the first receiving hole 14 has a circular cross-section. In this case, the diameter of the first movable element 20 is designed to be larger than the diameter of the inlet 14A of the first receiving hole 14, thereby preventing the first movable element 20 from dislodging from the first receiving hole 14. However, it should be understood that the shapes of the first movable element 20 and the inlet 14A of the first receiving hole 14 are not limited to this. According to embodiments of the invention, the first movable element 20 can be confined within the first receiving hole 14 as long as the diameter of the smallest inscribed circle of the inlet 14A of the first receiving hole 14 is smaller than the diameter of the largest circumscribed circle of the first movable element 20.

[0048] When the first movable element 20 is confined within the first receiving hole 14 by the inlet 14A, the first movable element 20 and the inlet 14A of the first receiving hole 14 are designed to fit together in shape so that the first movable element 20 can seal the inlet 14A of the first receiving hole 14, thereby closing the first coolant outlet hole 12. For example, when the first movable element 20 is a sphere and the inlet 14A of the first receiving hole 14 has a circular cross-section, the above-mentioned seal can be achieved by selecting the diameters of the first movable element 20 and the inlet 14A. However, it should be understood that the first movable element 20 and the inlet 14A of the first receiving hole 14 can adopt other shapes, as long as they can achieve an effective seal through shape fitting.

[0049] The structure and shape of the first movable element 20, the first elastic element 30, the first coolant outlet hole 12 and the first receiving hole 14 have been described above by way of example, but it should be understood that the present invention is not limited thereto.

[0050] Next, the opening and closing of the second coolant outlet hole 13 by the second active element 40 will be described.

[0051] The second movable element 40 is radially movably disposed in the second receiving hole 15 of the housing 10, and the second elastic element 50 engages with the second movable element 40 to apply an elastic force to the second movable element 40. More specifically, the second elastic element 50 can apply an elastic force to the second movable element 40 toward the first radial side. In an exemplary embodiment, as... Figures 3 to 5 As shown, both the second movable element 40 and the second elastic element 50 are disposed in the second receiving hole 15, and the second elastic element 50 is disposed closer to the second radial side of the housing 10 than the second movable element 40, thereby allowing the second elastic element 50 to apply a thrust to the second movable element 40. In an exemplary embodiment, the second elastic element 50 is a spring, particularly a compression spring. However, it should be understood that the invention is not limited thereto. In some embodiments, the second elastic element 50 is disposed closer to the first radial side of the housing 10 than the second movable element 40, thereby allowing the second elastic element 50 to apply a tensile force to the second movable element 40.

[0052] In an exemplary embodiment, such as Figures 3 to 5 As shown, the second coolant outlet 13 intersects with and passes through the second receiving hole 15. Thus, the second coolant outlet 13 can be opened or closed by moving the second movable element 40 within the second receiving hole 15. The second coolant outlet 13 has an opening 13A at its intersection with the second receiving hole 15. In some embodiments, the second movable element 40 (e.g., its sliding portion 41 described below) is configured to mate with the shape of the opening 13A of the second coolant outlet 13 to effectively cover and seal the second coolant outlet 13.

[0053] In an exemplary embodiment, the second movable element 40 includes a sliding portion 41 and a groove portion 42 successively distributed along its direction of movement. The sliding portion 41 guides the movement of the second movable element 40 within the second receiving hole 15 and closes the second coolant outlet hole 13. The groove portion 42 opens the second coolant outlet hole 13.

[0054] In an exemplary embodiment, the sliding portion 41 has a generally cylindrical shape, and the second receiving hole 15 has a generally circular cross-section. In some embodiments, the opening 13A also has a generally circular cross-section. In this case, the diameter of the sliding portion 41 of the second movable element 40 is designed to be larger than the diameter of the opening 13A of the second coolant outlet hole 13, thereby allowing the sliding portion 41 to effectively cover and seal the opening 13A of the second coolant outlet hole 13. However, it should be understood that the structure and shape of the second movable element 40, the second receiving hole 15, and the second coolant outlet hole 13 of the present invention are not limited thereto. According to an embodiment of the present invention, to achieve effective coverage and sealing of the second coolant outlet hole 13, at the opening 13A of the second coolant outlet hole 13, the projection of the opening 13A of the second coolant outlet hole 13 onto a plane perpendicular to the axis of rotation A falls within the projection of the sliding portion 41 of the second movable element 40.

[0055] In some embodiments, such as Figure 4 As shown, the sliding part 41 includes a keyway 41A, and a key 15A is provided in the second receiving hole 15. The key 15A and the keyway 41A can cooperate with each other, thereby preventing the sliding part 41 and the second movable element 40 from rotating in the first receiving hole 14.

[0056] In an exemplary embodiment, the sliding part 41 is designed to fit the shape of the inner wall of the second receiving hole 15. By matching the shapes of the sliding part 41 and the second receiving hole 15, it is possible to ensure smooth movement of the sliding part 41 within the second receiving hole 15, and to effectively seal and close the second coolant outlet hole 13.

[0057] When the second movable element 40 is in the position where the second coolant outlet hole 13 is open, the groove 42 is in fluid communication with the second coolant outlet hole 13, such as Figure 3 and Figure 6 As shown, the coolant from the coolant inlet hole 11 can flow through the tank 42 and out through the second coolant outlet hole 13 to the outside of the coolant distribution device 100.

[0058] The structure and shape of the second movable element 40, the second elastic element 50, the second coolant outlet hole 13, and the second receiving hole 15 have been described above by way of example, but it should be understood that the invention is not limited thereto. For example, the sliding portion 41 of the second movable element 40 and the second receiving hole 15 may have other shapes that fit together.

[0059] In some embodiments, the coolant distribution device 100 further includes a sleeve 60. The sleeve 60 has a cylindrical shape. The sleeve 60 can accommodate and constrain components such as the housing 10 of the coolant distribution device 100. When the coolant distribution device 100 includes the sleeve 60, the first receiving hole 14 and the second receiving hole 15 of the housing 10 extend to the outer peripheral surface of the housing 10. Thus, when assembling the coolant distribution device 100, the first movable element 20, the first elastic element 30, the second movable element 40, and the second elastic element 50 can be placed inside the housing 10 through the first receiving hole 14 and the second receiving hole 15, and then the housing 10 can be placed inside the sleeve 60. In addition, the sleeve 60 also includes an opening that mates with the coolant inlet hole 11 to allow coolant to flow in from the outside.

[0060] Therefore, by means of the first movable element 20 according to an embodiment of the present invention, the opening and closing of the first coolant outlet hole 12 can be dynamically controlled; and by means of the second movable element 40 according to an embodiment of the present invention, the opening and closing of the second coolant outlet hole 13 can be dynamically controlled. The operation of the coolant distribution device 100 according to an embodiment of the present invention will now be described.

[0061] When the rotational speed of the coolant distribution device 100 is less than or equal to the predetermined rotational speed (i.e., low-speed rotation), the centrifugal force on the first moving element 20 is relatively small, such as... Figure 6 As shown, the first movable element 20 can be held at the inlet 14A of the first receiving hole 14 and sealed by the elastic force of the first elastic element 30, thereby closing the first coolant outlet hole 12. Simultaneously, when the rotational speed of the coolant distribution device 100 is less than or equal to a predetermined rotational speed, the centrifugal force on the second movable element 40 is smaller, such as... Figure 6 As shown, the second movable element 40 can be held in a position where the groove 42 of the second movable element 40 is in fluid communication with the second coolant outlet hole 13 under the elastic force of the second elastic element 50, thereby opening the second coolant outlet hole 13. In this case, the coolant from the coolant inlet hole 11 cannot flow into the first coolant outlet hole 12, but flows out of the coolant distribution device 100 through the second coolant outlet hole 13 and enters the coolant passage 320 of the rotor 300, such as... Figure 3 and Figure 6 As shown by the dashed arrow, when the rotor 200 and the coolant distribution device 100 are rotating at low speed, the coolant can flow through the coolant distribution device 100 into the coolant passage 320 of the rotor 300 to cool the rotor 300.

[0062] When the rotational speed of the coolant distribution device 100 exceeds the predetermined rotational speed (i.e., high-speed rotation), such as Figure 7 As shown, the first movable element 20 can overcome the elastic force of the second elastic element 30 under centrifugal force and move within the first receiving hole 14, and move to exit the inlet 14A of the first receiving hole 14 and the inlet 12A of the first coolant outlet hole 12, thereby opening the first coolant outlet hole 12. Simultaneously, when the rotational speed of the coolant distribution device 100 is greater than a predetermined rotational speed, such as... Figure 7 As shown, the second movable element 40 can overcome the elastic force of the second elastic element 50 under centrifugal force and move within the second receiving hole 15, moving to a position where the sliding part 41 of the second movable element 40 covers and seals the opening 13A of the second coolant outlet hole 13, thereby closing the second coolant outlet hole 13. In this case, coolant from the coolant inlet hole 11 cannot flow out through the second coolant outlet hole 13, but can flow into the first coolant outlet hole 12 and flow out through the first coolant outlet hole 12, such as... Figure 7 As indicated by the dashed arrow. Thus, when the rotor 200 and the coolant distribution device 100 rotate at high speed, the coolant can flow through the coolant distribution device 100 to the outside of the rotor 300 without entering the coolant channel 320, thereby preventing leakage from the gap between the laminations 310 under the action of centrifugal force during high-speed rotation.

[0063] According to an embodiment of the present invention, the coolant distribution device 100 achieves dynamic control of the coolant flow direction through the coordinated action of the first movable element 20 and the second movable element 40, effectively improving cooling efficiency and preventing coolant leakage. During low-speed rotation, the first coolant outlet 12 is closed and the second coolant outlet 13 is open, allowing coolant to flow through the second coolant outlet 13 to the coolant channel 320 of the rotor 300, thus effectively cooling the rotor 300. During high-speed rotation, the first coolant outlet 12 is open and the second coolant outlet 13 is closed, allowing coolant to flow out through the first coolant outlet 12, avoiding the risk of coolant leakage from the gaps between the laminations 310 during high-speed rotation. This dynamically switching cooling method adaptively adjusts the coolant path according to the rotational speed, significantly improving the reliability and efficiency of the cooling system. This design utilizes the characteristics of centrifugal force and elastic elements to achieve automatic switching of the coolant outlets, eliminating the need for additional electronic control systems, resulting in a simple structure and high reliability.

[0064] Although the invention has been described with reference to exemplary embodiments, it should be understood that the invention is not limited to the constructions and methods of the above embodiments. Rather, the invention is intended to cover various modifications and equivalent configurations. Furthermore, while various elements and method steps of the disclosed invention have been shown in various exemplary combinations and constructions, other combinations including more or fewer elements or methods also fall within the scope of the invention.

[0065] List of reference numerals

[0066] 1. Rotating shaft;

[0067] 1' Liquid inlet hole;

[0068] 2. Rotor;

[0069] 2' Rotor laminations;

[0070] 2” Coolant passage;

[0071] 3. Balance board;

[0072] 10. Shell;

[0073] 10a First radial side;

[0074] 10b Second radial side;

[0075] 11 Coolant inlet hole;

[0076] 12 First coolant outlet hole;

[0077] Entrance 12A;

[0078] 13 Second coolant outlet hole;

[0079] 13A orifice;

[0080] 14 First receiving hole;

[0081] Entrance 14A;

[0082] 15 Second receiving hole;

[0083] 15A key;

[0084] 20 First active element;

[0085] 30. First elastic element;

[0086] 40 Second active element;

[0087] 41. Sliding part;

[0088] 41A keyway;

[0089] 42. Groove section;

[0090] 50 Second elastic element;

[0091] 100 Coolant distribution device;

[0092] 200 Rotating shaft;

[0093] 210. Inner cavity;

[0094] 220 Liquid Inlet Hole;

[0095] 300 rotor;

[0096] 310 Rotor laminations;

[0097] 320 Coolant passage;

[0098] 400 balance board;

[0099] 410 Coolant tank;

[0100] A. Rotation axis.

Claims

1. A coolant distribution device (100) for torsionally connecting to a rotor (300) and rotating about a rotation axis (A), said rotation axis (A) being located outside the coolant distribution device (100), the coolant distribution device (100) comprising: The housing (10) includes a coolant inlet hole (11), a first coolant outlet hole (12) and a second coolant outlet hole (13), wherein the first coolant outlet hole (12) and the second coolant outlet hole (13) are respectively configured to be in fluid communication with the coolant inlet hole (11); A first movable element (20) is radially movably disposed in a first receiving hole (14) of the housing (10) for controlling the opening and closing of the first coolant outlet hole (12); A first elastic element (30) is used to engage with the first movable element (20) and apply an elastic force to the first movable element (20); A second movable element (40) is radially movably disposed in a second receiving hole (15) of the housing (10) for controlling the opening and closing of the second coolant outlet hole (13); and A second elastic element (50) is used to engage with the second movable element (40) and apply an elastic force to the second movable element (40). When the rotational speed of the coolant distribution device (100) is less than or equal to a predetermined rotational speed, the first movable element (20) is held in the position of closing the first coolant outlet hole (12) under the action of the first elastic element (30), and the second movable element (40) is held in the position of opening the second coolant outlet hole (13) under the action of the second elastic element (50). When the rotational speed of the coolant distribution device (100) is greater than the predetermined rotational speed, the first movable element (20) moves to the position of opening the first coolant outlet hole (12) under the action of centrifugal force, overcoming the elastic force of the first elastic element (30), and the second movable element (40) moves to the position of closing the second coolant outlet hole (13) under the action of centrifugal force, overcoming the elastic force of the second elastic element (50).

2. The coolant distribution device (100) according to claim 1, wherein, The outlet of the first coolant outlet hole (12) is located at the first axial end of the coolant distribution device (100), and the outlet of the second coolant outlet hole (13) is located at the second axial end of the coolant distribution device (100).

3. The coolant distribution device (100) according to claim 2, wherein, The coolant distribution device (100) has a first radial side and a second radial side, the first radial side being closer to the axis of rotation (A) than the second radial side, and the inlet of the coolant inlet hole (11) is located on the first radial side of the coolant distribution device (100).

4. The coolant distribution device (100) according to any one of claims 1 to 3, wherein, The inlet of the first coolant outlet hole (12) is located in the first receiving hole (14), and the first coolant outlet hole (12) is configured to be in fluid communication with the coolant inlet hole (11) via the first receiving hole (14).

5. The coolant distribution device (100) according to claim 4, wherein, The diameter of the smallest inscribed circle of the inlet (14A) of the first receiving hole (14) is smaller than the diameter of the largest circumscribed circle of the first movable element (20), and the first movable element (20) is configured to fit the shape of the inlet (14A) of the first receiving hole (14).

6. The coolant distribution device (100) according to claim 5, wherein, The first active element (20) is a sphere, and the inlet (14A) of the first receiving hole (14) has a circular cross-section.

7. The coolant distribution device (100) according to any one of claims 1 to 3, wherein, The second coolant outlet (13) is configured to intersect with and pass through the second receiving hole (15), and the opening (13A) of the second coolant outlet (13) at the intersection with the second receiving hole (15) is configured to fit the shape of the second movable element (40).

8. The coolant distribution device (100) according to claim 7, wherein, The second movable element (40) includes a sliding portion (41) and a groove portion (42) distributed sequentially along its direction of movement. The sliding portion (41) is configured to fit the inner wall shape of the second receiving hole (15), and the groove portion (42) is configured to be in fluid communication with the second coolant outlet hole (13) when the second movable element (40) is in the position of opening the second coolant outlet hole (13).

9. The coolant distribution device (100) according to claim 8, wherein, The sliding portion (41) of the second active element (40) has a generally cylindrical shape, and one of the sliding portion (42) and the second receiving hole (15) includes a key, and the other includes a keyway that engages with the key.

10. The coolant distribution device (100) according to any one of claims 1 to 3, wherein, The first elastic element (30) is disposed in the first receiving hole (14) and is positioned closer to the second radial side than the first movable element (20); and / or The second elastic element (50) is disposed in the second receiving hole (15) and is positioned closer to the second radial side than the second movable element (20).

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