Hybrid cooling motors, powertrains, power equipment

Abstract

The present invention provides a hybrid cooling motor, power assembly, and power equipment. A hybrid cooling motor includes: a casing, in which a hybrid cooling pipeline is arranged, and the hybrid cooling pipeline includes: a cooling water circuit, which is connected to an external water cooling device; a cooling oil circuit, which is at least partially nested inside the cooling water circuit, and has an oil inlet and an oil outlet connected to an oil pump, and the cooling oil in the cooling oil circuit enters and cools the inside of the motor through the oil outlet. The present invention nests part of the cooling oil circuit into the cooling water circuit, and the water in the cooling water circuit can achieve heat exchange under the action of an external refrigeration device to maintain the temperature required for cooling the motor. The outer peripheral wall in the cooling water circuit contacts the casing to achieve cooling of the casing, and the inner peripheral wall contacts the cooling oil circuit to achieve cooling of the medium oil in the oil circuit, thereby completing the heat exchange process of the cooling oil circuit, and no separate heat exchange module is required to be arranged outside the casing, which simplifies the motor structure and facilitates the installation of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor cooling, and in particular to a hybrid cooling motor, a power assembly, and a power device. Background Art

[0002] Due to its own characteristics, the motor will generate heat during operation, which will increase the temperature and affect its life and performance. In order to ensure the long-term stable operation of the motor, the temperature of the motor needs to be controlled within a reasonable range.

[0003] In the prior art, motor cooling includes air cooling, water cooling, and oil cooling. Air cooling is mainly used for low-power motors, while high-power motors are generally water-cooled or oil-cooled. Currently, most drive motors use a water-cooling structure, but the water-cooling solution cannot effectively cool the inside of the motor. The heat generated inside can only be transferred to the casing through the air, but the air has a poor heat conduction effect, resulting in the casing temperature not being high when the motor is working, but the actual temperature inside the motor is still very high. The oil cooling method can directly cool the inside of the motor, but the specific heat capacity of oil is low, and the cooling effect of the iron core using only the oil cooling method is poor.

[0004] In the prior art, there is a method of using a mixed cooling of oil cooling and water cooling in the motor. Its structure generally includes an oil cooling circulation system arranged inside the motor, a water cooling module arranged at the motor housing, and a heat exchange module. The above-mentioned heat exchange module includes a heat exchange oil channel and a heat exchange water channel. The heat absorbed by the cooling oil in the heat exchange oil channel is transferred to the cooling water in the heat exchange water channel. The above-mentioned cooling water then enters the external water cooling device to complete the heat exchange. However, the above-mentioned heat exchange module is generally directly installed on the outside of the motor housing and protrudes from the motor housing, which increases the size of the motor. During installation, a separate installation space needs to be reserved at the corresponding heat exchange module, which makes the working conditions of the motor installation high and the installation is inconvenient. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect in the prior art that the motor cooling structure is complex and causes inconvenience in motor installation, thereby providing a hybrid cooling motor, power assembly, and power equipment.

[0006] In order to solve the above problems, the present invention provides a hybrid cooling motor, comprising: a casing, in which a mixed cooling pipeline is arranged, the mixed cooling pipeline comprises: a cooling water circuit, which is connected to an external water cooling device; a cooling oil circuit, which is at least partially nested inside the cooling water circuit, and has an oil inlet and an oil outlet connected to an oil pump, and the cooling oil in the cooling oil circuit enters into and cools the inside of the motor through the oil outlet.

[0007] Furthermore, the flow cross-sectional shape of the cooling water channel is constructed into two "concave" shapes, the two "concave" shapes are arranged in a manner of opposing notches, and at least a portion of the cooling oil channel is sandwiched between the two notches.

[0008] Furthermore, the cooling water circuit has a water inlet and a water outlet opened on the outer peripheral wall of the casing, and the water outlet is connected to the water cooling device.

[0009] Furthermore, the water inlet and the oil inlet are staggered or spaced apart from each other along the axis direction of the cooling motor.

[0010] Furthermore, the oil inlet is formed on the outer peripheral surface of the housing, and the oil outlet is formed on the inner peripheral surface of the housing.

[0011] Furthermore, the oil inlet is arranged at a middle position of the casing in the axial direction, and at least two oil outlets are respectively arranged at shaft end covers close to the casing.

[0012] Furthermore, the cooling water channel and the cooling oil channel are constructed as spiral grooves formed along the central axis of the casing.

[0013] Furthermore, the cooling water circuit and the cooling oil circuit are constructed as "S"-shaped curved grooves connected end to end along the circumferential direction of the casing.

[0014] The hybrid cooling motor in the present invention further comprises a temperature detection device, which is arranged inside the housing and the motor to detect the temperature parameters of the hybrid cooling motor so as to adjust the flow of cooling water and / or cooling oil.

[0015] The present invention also provides a power assembly, comprising: any one of the hybrid cooling motors described above; and a motor controller electrically connected to the hybrid cooling motor.

[0016] The powertrain in the present invention further includes: a reducer connected to the motor shaft of the hybrid cooling motor; and an oil pump arranged inside the reducer.

[0017] Furthermore, the oil pump provides cooling oil to the cooling oil circuit through the oil inlet.

[0018] The present invention also provides a power device including: any one of the power assemblies described above.

[0019] Furthermore, the power equipment is a new energy vehicle.

[0020] The technical solution of the present invention has the following advantages:

[0021] 1. The hybrid cooling motor in the present invention comprises: a casing, in which a mixed cooling pipeline is arranged, and the mixed cooling pipeline comprises: a cooling water circuit, which is connected to an external water cooling device; a cooling oil circuit, which is at least partially nested inside the cooling water circuit, and has an oil inlet and an oil outlet connected to an oil pump, and the cooling oil in the cooling oil circuit enters and cools the inside of the motor through the oil outlet. The above-mentioned cooling water circuit realizes the cooling of the casing, and the cooling oil circuit realizes the cooling of the inside of the motor, such as the rotor assembly and the stator assembly. Based on this, the present invention partially nests the cooling oil circuit into the cooling water circuit, and the water in the cooling water circuit can realize heat exchange under the action of the external refrigeration equipment to maintain the temperature required for cooling the motor. The outer peripheral wall in the cooling water circuit contacts the casing to realize the cooling of the casing, and the inner peripheral wall contacts the cooling oil circuit to realize the cooling of the medium oil in the oil circuit, thereby completing the heat exchange process of the cooling oil circuit, and no separate heat exchange module is required to be arranged outside the casing, which simplifies the motor structure and facilitates the installation of the motor.

[0022] 2. The cross-sectional shape of the cooling water path in the hybrid cooling motor of the present invention is constructed into two "concave" shapes, the two "concave" shapes are arranged in a manner of notches facing each other, and at least part of the cooling oil path is sandwiched between the two notches. The "concave" shape has more contact surfaces with the housing and the cooling oil path, and the contact area is large, which is conducive to enhancing the cooling effect.

[0023] 3. The water inlet and the oil inlet of the hybrid cooling motor of the present invention are staggered or spaced apart along the axis of the cooling motor. The water inlet and the oil inlet require external pipes, and corresponding joints are required when the pipes are connected to ensure good sealing of the pipes. However, the pipe joints have a certain outer diameter. In order to avoid the convenience of joint installation and prevent design interference, the water inlet and the water outlet need to be staggered or spaced apart to reserve enough operating space.

[0024] 4. In the hybrid cooling motor of the present invention, the oil inlet is arranged at the middle position of the casing in the axial direction, and at least two oil outlets are respectively arranged at the shaft end cover close to the casing.

[0025] On the one hand, the cooling oil in the cooling oil circuit has poor fluidity in a low temperature environment, and cooling oil with poor fluidity is not conducive to cooling the inside of the motor. Assuming that the oil inlet is set at the end of the casing shaft, in order to ensure the overall utilization of the cooling water circuit, the oil outlet is usually set at the other end of the casing. The cooling oil will have a low cooling temperature after passing through the entire cooling water circuit. In order to ensure the fluidity of the cooling oil, the temperature of the cooling water needs to be lowered, but this will affect the cooling effect of the cooling water circuit on the casing. Setting the oil inlet at the middle position in the axial direction of the casing shortens the travel of the cooling oil circuit in the cooling water circuit, which can ensure good stability of the cooling oil while accelerating the cooling effect of the cooling water circuit on the cooling oil circuit.

[0026] On the other hand, as mentioned above, shortening the travel of the cooling oil circuit in the cooling water circuit can also prevent the cooling oil circuit from exchanging too much heat with the cooling water circuit, resulting in the cooling water temperature in the subsequent water circuit becoming high during the cooling process of the cooling oil circuit, and failing to achieve the cooling effect on the casing.

[0027] 5. The hybrid cooling motor in the present invention also includes a temperature detection device, which is arranged inside the casing and the motor to detect the temperature parameters of the hybrid cooling motor to adjust the flow of cooling water and / or cooling oil.

[0028] From the above discussion, the cold deoiling has the problem of poor cooling performance, and the cooling water circuit needs to cool the casing and the cooling oil circuit at the same time, which requires good control of the temperature of both to achieve a good cooling effect on the motor. The temperature sensor is set to feed back the detected temperature information to the external control unit to control and adjust the flow of cooling water and / or cooling oil to achieve temperature regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A cross-sectional view of the hybrid cooling motor in Example 1 provided by the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the hybrid cooling motor in Example 1 provided by the present invention.

[0032] Description of reference numerals:

[0033] 1-mixing cooling pipeline; 11-cooling water circuit; 12-cooling oil circuit; 111-water inlet; 112-water outlet; 121-oil inlet; 122-oil outlet;

[0034] 2- Casing. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] Example 1

[0040] Figure 1 to Figure 2 As shown, a hybrid cooling motor provided in this embodiment includes: a casing 2, in which a mixed cooling pipeline 1 is arranged, and the mixed cooling pipeline 1 includes: a cooling water circuit 11, which is connected to an external water cooling device; a cooling oil circuit 12, which is at least partially nested in the cooling water circuit 11, and has an oil inlet 121 and an oil outlet 122 connected to an oil pump, and the cooling oil in the cooling oil circuit 12 enters through the oil outlet 122 and cools the inside of the motor.

[0041] It should be noted that the motor provided in this embodiment includes a motor main body, a water cooling device that provides a cold source such as cooling water for a cooling system in the motor, and an oil pump that realizes the circulation of cooling oil.

[0042] The mixed cooling pipeline 1 in this embodiment is directly formed on the casing 2, which can be realized by mold manufacturing.

[0043] It should also be noted that the above-mentioned motor interior refers to the motor structure stator assembly and rotor assembly inside the casing 1. The above-mentioned cooling oil comes out of the oil outlet 122 and acts on the stator assembly and the rotor assembly. Generally, the stator assembly and the rotor assembly are processed with oil circuits. The cooling oil enters the oil circuit inside the motor to achieve cooling. After the cooling effect, the cooling oil will be pumped back by the oil pump.

[0044] The above-mentioned cooling water circuit 11 in this embodiment realizes cooling of the casing 2, and the cooling oil circuit 12 realizes cooling of the inside of the motor, such as the rotor assembly and the stator assembly. Based on this, this embodiment embeds part of the cooling oil circuit into the cooling water circuit 11. The water in the cooling water circuit 11 can realize heat exchange under the action of external refrigeration equipment to maintain the temperature required for cooling the motor. The outer peripheral wall in the cooling water circuit 11 contacts the casing 2 to cool the casing 2, and the inner peripheral wall contacts the cooling oil circuit 12 to cool the medium oil in the oil circuit, thereby completing the heat exchange process of the cooling oil circuit 12. There is no need to set a separate heat exchange module outside the casing, which simplifies the motor structure and facilitates motor installation.

[0045] The mixed cooling pipeline 1 is described in detail below. As mentioned above, the oil cooling pipeline 12 in the mixed cooling pipeline 1 is partially nested in the water cooling pipeline 11. Specifically, the flow cross-sectional shape of the cooling water circuit 11 in this embodiment is constructed as two "concave" shapes. The flow cross-sectional shape refers to the cross-sectional shape made perpendicular to the flow direction of the liquid, wherein the two "concave" shapes are arranged in a manner of notches facing each other. The "concave" shape in this embodiment is rotated 90° clockwise on the basis of the existing shape to form the direction of the notch. The cooling oil circuit 12 is completely sandwiched between the two notches. The flow cross-sectional shape of the cooling oil circuit 12 is square, which is adapted to the size of the two facing notches. The "concave" shape in this embodiment has many contact surfaces with the housing 2 and the cooling oil circuit 12, and the contact area is large, which is conducive to enhancing the cooling effect.

[0046] In some other embodiments, the cooling oil circuit 12 may also be partially sandwiched between the two notches. In a specific embodiment, when the flow cross-section of the cooling oil circuit 12 is circular, the portion of the circular cross-section may protrude from the gap between the two notches to achieve partial sandwiching. The advantage of partial sandwiching is that the cooling oil circuit can be partially cooled to prevent the cooling oil from being at a low temperature and hindering its fluidity.

[0047] In some other embodiments, the flow cross-sectional shape of the cooling water channel 11 can also be constructed into two "C" shapes or other structures that can achieve a covering effect, wherein the "C"-shaped structure can reduce the adhesion between the fluid and the pipe wall, facilitating the flow of cooling water.

[0048] Furthermore, the cooling water circuit 11 has a water inlet 111 and a water outlet 112 opened on the outer peripheral wall of the casing 2 , and the water outlet 112 is connected to the water cooling device. Specifically, the water inlet 111 and the water outlet 112 are respectively located at two axial ends of the casing 2 .

[0049] like Figure 1 As shown, the water inlet 111 and the water outlet 112 protrude from the housing 2 and are formed thereon, and the protruding height is suitable for the size of the pipe connector to facilitate the installation of the pipe connector.

[0050] like Figure 2 As shown, the water inlet 111 and the oil inlet 121 are spaced apart from each other along the axis direction of the cooling motor. The water inlet 111 and the oil inlet 121 require external pipes, and corresponding joints are required when connecting the pipes to ensure good sealing of the pipes. However, the pipe joints have a certain outer diameter. In order to avoid the convenience of joint installation and prevent design interference, the water inlet and the water outlet need to be staggered or spaced apart to reserve sufficient operating space.

[0051] In some other embodiments, the water inlet 111 and the oil inlet 121 may also be arranged in a staggered manner to increase the flexibility of the arrangement of the oil inlet 121 .

[0052] The oil inlet 121 in this embodiment is formed on the outer peripheral surface of the casing 2, and the oil outlet 122 is formed on the inner peripheral surface of the casing 2, so as to facilitate the introduction and discharge of cooling oil.

[0053] The oil inlet 121 in this embodiment is formed at the middle position of the axial direction of the housing 2, and the two oil outlets 122 are respectively arranged at the shaft end cover close to the housing 2. This arrangement has the following uses:

[0054] On the one hand, the cooling oil in the cooling oil circuit 12 has poor fluidity in a low temperature environment, and cooling oil with poor fluidity is not conducive to cooling the inside of the motor. Assuming that the oil inlet 121 is set at the axial end of the casing 2, in order to ensure the overall utilization of the cooling water circuit, the oil outlet is usually set at the other end of the casing 2. The cooling oil will have a low cooling temperature after passing through the entire cooling water circuit 11. In order to ensure the fluidity of the cooling oil, the temperature of the cooling water needs to be lowered, but this will affect the cooling effect of the cooling water circuit on the casing 2. Setting the oil inlet 121 at the middle position in the axial direction of the casing 2 shortens the travel of the cooling oil circuit 12 in the cooling water circuit 11, which can ensure good stability of the cooling oil while accelerating the cooling effect of the cooling water circuit 11 on the cooling oil circuit 12.

[0055] On the other hand, as mentioned above, shortening the travel of the cooling oil circuit 12 in the cooling water circuit 11 can also prevent the cooling oil circuit 12 from exchanging too much heat with the cooling water circuit 11, resulting in the cooling water temperature in the subsequent water circuit becoming high during the cooling process of the cooling oil circuit 12, and failing to achieve the cooling effect on the casing.

[0056] In order to facilitate the flow of cooling water or cooling oil, the cooling water path 11 and the cooling oil path 12 in this embodiment are constructed as spiral grooves formed along the central axis of the casing 2 .

[0057] Of course, in some other embodiments, the cooling water circuit 11 and the cooling oil circuit 12 may also be constructed as “S”-shaped curved grooves connected end to end along the circumference of the casing 2 .

[0058] This embodiment also includes a temperature detection device, which is arranged inside the housing 2 and the motor to detect the temperature parameters of the hybrid cooling motor to adjust the flow of cooling water and / or cooling oil. According to the above discussion, the cooling oil has the problem of poor cooling performance, and the cooling water circuit 11 needs to cool the housing 2 and the cooling oil circuit at the same time, which requires good control of the temperature of both to achieve a good cooling effect on the motor. The temperature sensor is set to feed back the detected temperature information to the external control unit, which controls to adjust the flow of cooling water and / or cooling oil to achieve temperature regulation.

[0059] The mixed cooling motor in this embodiment has the following adjustment process:

[0060] When the temperature sensor detects temperature information, the heating condition of the motor and the fluidity of the cooling oil can be judged (the fluidity of the cooling oil can be judged according to its temperature, and the lower the temperature, the worse the fluidity). The following control processes can be performed according to different situations:

[0061] When it is determined that the heat of the motor is low, the power of the water pump and the oil pump is controlled to reduce the flow of cooling water and cooling oil, thereby reducing energy consumption while ensuring the cooling effect of the motor.

[0062] When it is determined that the motor is overheated, the power of the water pump and the oil pump is controlled, and the flow of cooling water and cooling oil is increased to ensure the cooling effect on the motor.

[0063] In the above two cases, the fluidity of the cooling oil is further judged. When the fluidity of the cooling oil is low, the cooling water flow rate can be lowered or the cooling water temperature can be increased to reduce the viscosity and improve the fluidity.

[0064] Example 2

[0065] This embodiment provides a powertrain including the hybrid cooling motor in the above-mentioned embodiment 1; and a motor controller electrically connected to the hybrid cooling motor. The above-mentioned motor controller is generally a motor drive device for controlling the operating state of the motor.

[0066] This embodiment further includes: a reducer connected to the motor shaft of the hybrid cooling motor; and an oil pump arranged inside the reducer, the oil pump providing cooling oil to the cooling oil circuit through the oil inlet 121.

[0067] Example 3

[0068] This embodiment provides a power device including the power assembly in Embodiment 2, and the power device is a new energy vehicle and has all the technical advantages of the above-mentioned power assembly, which will not be described one by one here.

[0069] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A hybrid cooling motor, characterized in that: include: A casing (2) is provided with a mixed cooling pipeline (1) therein, wherein the mixed cooling pipeline (1) comprises: A cooling water circuit (11) is connected to an external water cooling device; The cooling oil circuit (12) is at least partially nested inside the cooling water circuit (11), and has an oil inlet (121) and an oil outlet (122) connected to an oil pump, and the cooling oil in the cooling oil circuit (12) enters the inside of the motor through the oil outlet (122) and cools the inside of the motor; the flow cross-sectional shape of the cooling water circuit (11) is constructed into two "concave" shapes, the two "concave" shapes are arranged in a manner that the notches are opposite to each other, and at least a portion of the cooling oil circuit (12) is sandwiched between the two notches.

2. The hybrid cooling motor according to claim 1, characterized in that: The cooling water channel (11) comprises a water inlet (111) and a water outlet (112) which are arranged on the outer peripheral wall of the casing (2); the water outlet (112) is connected to the water cooling device.

3. The hybrid cooling motor according to claim 2, characterized in that: The water inlet (111) and the oil inlet (121) are arranged in a staggered or spaced relationship with each other along the axis direction of the cooling motor.

4. The hybrid cooling motor according to claim 1, characterized in that: The oil inlet (121) is formed on the outer peripheral surface of the housing (2), and the oil outlet (122) is formed on the inner peripheral surface of the housing (2).

5. The hybrid cooling motor according to claim 4, characterized in that: The oil inlet (121) is arranged at a middle position in the axial direction of the casing (2), and at least two oil outlets (122) are respectively arranged at shaft end covers close to the casing (2).

6. The hybrid cooling motor according to any one of claims 1 to 5, characterized in that: The cooling water circuit (11) and the cooling oil circuit (12) are constructed as spiral grooves formed along the central axis of the casing (2).

7. The hybrid cooling motor according to any one of claims 1 to 5, characterized in that: The cooling water circuit (11) and the cooling oil circuit (12) are constructed as "S"-shaped curved grooves connected end to end along the circumference of the casing (2).

8. The hybrid cooling motor according to any one of claims 1 to 5, characterized in that: It also comprises a temperature detection device, which is arranged inside the housing (2) and the motor and is used to detect the temperature parameters of the hybrid cooling motor so as to adjust the flow of cooling water and / or cooling oil.

9. A powertrain, characterized in that: include: The hybrid cooling motor as described in any one of claims 1 to 8; and a motor controller electrically connected to the hybrid cooling motor.

10. The powertrain according to claim 9, characterized in that: Also includes: A reducer connected to the motor shaft of the hybrid cooling motor; And an oil pump is arranged inside the reducer.

11. The powertrain according to claim 10, characterized in that: The oil pump provides cooling oil to the cooling oil circuit through the oil inlet (121).

12. A power device, characterized in that: include: A power assembly as described in any one of claims 9 to 11 above.

13. The power device according to claim 12, characterized in that: The power equipment is a new energy vehicle.

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