A cooling device suitable for a motor stator and a motor

Abstract

The utility model belongs to motor technical field discloses a cooling device and motor suitable for motor stator. Including: oil channel, first oil baffle and second oil baffle, oil channel is constituted by the gap between stator core and casing, the bottom of first oil baffle is provided with oil groove, the bottom surface of oil groove two waist board respectively corresponds to the upper end face on stator core and casing part, and oil channel is located the just below of oil groove, a plurality of first horizontal oil holes are arranged on the waist board of oil groove and stator core corresponding interval, the lower end surface of second oil baffle is fixed with the protruding end part of casing, and the upper end surface is fixed with the bottom surface of stator core, and its outer peripheral wall and the clearance between the circumferential inner side wall of casing are left for cooling oil flow, a plurality of second horizontal oil holes are arranged on the second oil baffle interval, and the oil outlet end of each first horizontal oil hole and each second horizontal oil hole is corresponding with end part winding respectively. The utility model satisfies the demand of stator heat dissipation at the same time, and the axial space is smaller.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a cooling device for motor stators and a motor. Background Technology

[0002] An electric motor is a general-purpose device that converts electrical energy into mechanical energy. It includes both electric motors and generators, and is widely used in industries such as manufacturing, agriculture, and transportation. The windings in the stator are the main heat-generating components of the motor. In practical applications, to ensure stable operation of the motor, appropriate cooling devices are needed to effectively dissipate heat from the stator.

[0003] In existing technologies, stator cooling devices are mostly designed with oil rings as the main component. Specifically, the oil ring has a longitudinally stretched, Z-shaped structure. During assembly, the corresponding position of the oil ring abuts against the protruding end of the housing, and then sealing rings or gaskets are installed at corresponding positions on the inner circumferential sidewall of the housing and the bottom of the stator core to achieve a press-fit seal between the oil ring and the housing and stator core. During the cooling process, cooling oil flows through oil channels and is sprayed onto the windings on the stator core through oil holes in the oil ring for heat dissipation.

[0004] However, while the aforementioned stator cooling device based on an oil ring meets the heat dissipation requirements in practical applications, it introduces new technical drawbacks. Specifically, the Z-shaped oil ring has a large longitudinal dimension, resulting in a large axial space occupation. This makes it difficult to further reduce the axial dimension of the entire motor, thus failing to meet the current trend of miniaturization design. Utility Model Content

[0005] The purpose of this invention is to provide a cooling device and motor suitable for motor stators, so as to solve the technical problem that the cooling and heat dissipation requirements of stators and the requirements of motor miniaturization are difficult to reconcile when using oil ring heat dissipation.

[0006] To achieve the above objectives, the present invention proposes the following technical solution:

[0007] In a first aspect, this technical solution provides a cooling device suitable for motor stators, comprising: an oil passage, a first oil baffle, and a second oil baffle; wherein the first oil baffle and the second oil baffle are both annular structures;

[0008] The oil passage is formed by the gap between the stator core and the housing;

[0009] The bottom of the first oil baffle is provided with an oil groove, and the bottom surfaces of the two waist plates of the oil groove are respectively connected and fixed to the upper surfaces of the stator core and the housing. The oil passage is located directly below the oil groove. A number of first transverse oil holes are provided at intervals on the waist plates of the oil groove and the stator core.

[0010] The lower end face of the second oil baffle is fixed to the protruding end of the housing, and the upper end face is fixed to the bottom surface of the stator core; and a gap is left between the outer peripheral wall of the second oil baffle and the inner circumferential side wall of the housing to allow cooling oil to flow through; wherein, a number of second transverse oil holes are spaced apart on the second oil baffle.

[0011] The oil outlet ends of each of the first transverse oil holes and each of the second transverse oil holes correspond to the end windings, respectively.

[0012] Furthermore, the inlet end of each first transverse oil hole is lower than the outlet end.

[0013] Furthermore, the inlet end of each second transverse oil hole is higher than the outlet end.

[0014] Furthermore, the oil trough is provided with an annular inner chamfer.

[0015] Furthermore, a first adhesive layer is provided between the first oil baffle and the housing and stator core for fixation; a second adhesive layer is provided between the second oil baffle and the housing and stator core for fixation.

[0016] Furthermore, the bottom of the second oil baffle is provided with a rubber groove.

[0017] Furthermore, both the first and second oil baffles are provided with a plurality of fixing ears at intervals; each fixing ear is provided with a fixing hole; and a fixing component that is installed on the housing and the stator core passes through the fixing hole.

[0018] Furthermore, the inner circumferential sidewall of the housing is provided with a plurality of arc-shaped protrusions arranged in a matrix, and the unused end face of each arc-shaped protrusion is attached to the outer circumferential wall of the stator core; wherein, the gap between each arc-shaped protrusion forms the oil passage.

[0019] Furthermore, the stator core has a plurality of arc-shaped protrusions arranged in a matrix on its outer peripheral wall, and the unused end face of each arc-shaped protrusion is attached to the inner circumferential sidewall of the housing; wherein the gap between each arc-shaped protrusion forms the oil passage.

[0020] Secondly, this technical solution provides an electric motor, including the aforementioned cooling device.

[0021] Beneficial effects:

[0022] This technical solution provides a novel cooling device for motor stators to solve the technical problem that existing stator cooling devices introduce axial dimension defects while meeting heat dissipation requirements.

[0023] The cooling device includes an oil channel, and a first and second oil baffle plate with an annular structure. The oil channel is formed by the gap between the stator core and the housing. An oil groove is formed at the bottom of the first oil baffle plate, and the bottom surfaces of the two side plates of the oil groove are respectively overlapped and fixed to the upper surfaces of the stator core and the housing. The oil channel is located directly below the oil groove. A plurality of first transverse oil holes are spaced apart on the corresponding side plates of the oil groove and the stator core. The lower end face of the second oil baffle plate is fixed to the protruding end of the housing, and the upper end face is fixed to the bottom surface of the stator core. A gap is left between the outer peripheral wall of the second oil baffle plate and the inner circumferential side wall of the housing to allow cooling oil to flow through. A plurality of second transverse oil holes are spaced apart on the second oil baffle plate. The oil outlet ends of each first and second transverse oil hole correspond to the end windings.

[0024] Therefore, this technical solution designs a flat first and second oil baffle plate. During the cooling process, with the assistance of the corresponding oil pump, for the first oil baffle plate, the cooling oil flows directly into the oil sump through the oil channel and then out through the first transverse oil hole, spraying onto the upper winding; for the second oil baffle plate, the cooling oil flows directly into the gap between the housing and the second oil baffle plate through the oil channel, then out through the second transverse oil hole, spraying onto the lower winding. While meeting the cooling requirements, from the perspective of the oil baffle structure, the flat oil baffle plate, compared with the longitudinally stretched Z-shaped oil ring, shortens the axial dimension of the transition section between the oil channel and the oil hole on the oil baffle structure, thereby reducing the occupancy of the entire motor's axial space.

[0025] It should be understood that all combinations of the foregoing concepts and the additional concepts described in more detail below can be considered as part of the utility model subject matter of this disclosure, provided that such concepts do not contradict each other.

[0026] The foregoing and other aspects, embodiments, and features of the present invention will be more fully understood from the following description in conjunction with the accompanying drawings. Other additional aspects of the present invention, such as features and / or beneficial effects of exemplary embodiments, will become apparent from the following description or may be learned through practice of specific embodiments according to the teachings of the present invention. Attached Figure Description

[0027] The accompanying drawings are not intended to be drawn to scale. In the drawings, each identical or nearly identical component shown in the various figures may be denoted by the same reference numeral. For clarity, not every component is labeled in each figure. Embodiments of various aspects of the present invention will now be described by way of example and with reference to the accompanying drawings, wherein:

[0028] Figure 1 This is a schematic diagram of the overall structure of the first oil baffle described in this embodiment;

[0029] Figure 2 This is a partial structural diagram of the first oil baffle described in this embodiment;

[0030] Figure 3 This is a schematic diagram of the overall structure of the second oil baffle described in this embodiment;

[0031] Figure 4 This is a partial structural diagram of the second oil baffle described in this embodiment;

[0032] Figure 5 This is a schematic diagram of the motor structure described in this embodiment.

[0033] The attached figures are labeled as follows:

[0034] 1 is the first oil baffle, 2 is the second oil baffle, 3 is the stator core, 4 is the housing, 5 is the fixing component, 6 is the oil passage; 11 is the oil groove, 12 is the first transverse oil hole, 13 is the first fixing lug, 21 is the glue groove, 22 is the second transverse oil hole, 23 is the second fixing lug, 41 is the arc-shaped protrusion; 11a is the inner chamfer, 13a is the first fixing hole, and 23a is the second fixing hole. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains.

[0036] The terms "first," "second," and similar words used in this utility model patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, unless the context clearly indicates otherwise, the singular forms of "an," "a," or "the," etc., do not indicate a quantity limitation, but rather indicate the presence of at least one. Terms such as "comprising" or "including" indicate that the element or object preceding "comprising" encompasses the features, integrals, steps, operations, elements, and / or components listed following "comprising" or "including," and do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or collections thereof. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0037] An electric motor is a general-purpose device that converts electrical energy into mechanical energy. To ensure the stable operation of the motor, the stator needs to be effectively cooled. However, existing stator cooling devices based on oil rings and seals have the following drawbacks: (1) Oil rings are mostly longitudinally stretched Z-shaped structures, which occupy a certain axial space, making it difficult to achieve longitudinal miniaturization of the entire motor. (2) Oil rings and various independently set seals such as rubber rings and gaskets often require mold processing, resulting in high manufacturing costs. (3) Oil rings with press-fit settings are difficult to install, and the structural reliability of the entire cooling device is low due to installation inaccuracies, which can lead to reduced heat dissipation efficiency or even heat dissipation failure. Based on this, this embodiment aims to provide a cooling device suitable for motor stators to solve the above-mentioned technical problems simultaneously.

[0038] The cooling device for motor stators disclosed in this utility model will be further described in detail below with reference to the embodiments shown in the accompanying drawings.

[0039] Combination Figures 1 to 5 As shown, the cooling device includes an oil passage 6, a first oil baffle 1, and a second oil baffle 2 that cooperate with each other.

[0040] The oil passage 6 is formed by the gap between the stator core 3 and the housing 4. Specifically, in this embodiment, a plurality of arc-shaped protrusions 41 arranged in a matrix are provided on the inner circumferential sidewall of the housing 4, and the unused end face of each arc-shaped protrusion 41 is attached to the outer circumferential wall of the stator core 3. The gap between each arc-shaped protrusion forms the oil passage. At this time, under the enclosure of the arc-shaped protrusions 41, the inner circumferential sidewall of the housing, and the outer sidewall of the stator core, the gap between each arc-shaped protrusion 41 will form the oil passage 6.

[0041] As another specific implementation, a plurality of arc-shaped protrusions arranged in a matrix can be provided on the outer peripheral wall of the stator core 3, and each arc-shaped protrusion is attached to the inner circumferential sidewall of the housing 4. In this case, the gaps between the arc-shaped protrusions, the inner circumferential sidewall of the housing, and the outer peripheral wall of the stator core can also form the oil passage 6.

[0042] The first oil baffle plate 1 has an overall annular structure. Specifically, an oil groove 11 is formed at its bottom. The bottom surfaces of the two side plates of the oil groove 11 are respectively overlapped and fixed to the upper surfaces of the stator core 3 and the housing 4, and the oil passage 6 is located directly below the oil groove 11. Several first transverse oil holes 12 are also spaced apart on the corresponding side plates of the oil groove 11 and the stator core 3. In specific implementations, sealing rings, gaskets, or other sealing components can be used between the first oil baffle plate 1 and the stator core 3 and the housing 4. However, considering the manufacturing cost of mold opening and the structural reliability issues when using independent sealing components for press-fit sealing, this embodiment preferably uses a first adhesive layer. Specifically, a first adhesive layer is provided between the first oil baffle plate 1 and the housing 4 and the stator core 3 for fixing them together. More specifically, the first adhesive layer is a sealant layer.

[0043] As a preferred embodiment, to prevent adhesive overflow during the application process and subsequent blockage of the oil passages, an annular inner chamfer 11a is provided on the oil groove 11. In this case, excess sealant will be squeezed to the inner chamfer 11a during the bonding and fixing process, thereby avoiding occupying the oil passage space within the oil groove 11, thus improving the connectivity of the oil passages and ensuring heat dissipation.

[0044] The second oil baffle 2, viewed as a whole, is also a ring structure. Specifically, the lower end face of the second oil baffle 2 is fixed to the protruding end of the housing 4, and the upper end face is fixed to the bottom surface of the stator core 3. A gap is left between the outer peripheral wall of the second oil baffle 2 and the inner circumferential wall of the housing 4 to allow cooling oil to flow through. Several second transverse oil holes 22 are spaced apart on the second oil baffle. In specific implementations, sealing rings, gaskets, or other sealing components can be used between the second oil baffle 2, the stator core 3, and the housing 4. However, considering the manufacturing cost of mold opening and the structural reliability issues when using independent sealing components for press-fit sealing, this embodiment preferably uses a second adhesive layer. Specifically, a second adhesive layer is provided between the second oil baffle 2, the housing 4, and the stator core 3 for fixing them together. More specifically, the second adhesive layer is also a sealant layer.

[0045] As a further preferred embodiment, since the second oil baffle 2 is located in the lower part of the entire motor interior, its visibility during assembly is poor. Therefore, a glue groove 21 is provided at the bottom of the second oil baffle 2. In this case, before assembly, sealant is first filled into the glue groove 21 with an interference fit. Then, during the pressing and installation of the second oil baffle 2, the interference fit of the sealant in the glue groove 21 is squeezed out to form a second adhesive layer between the second oil baffle 2 and the protruding end of the housing, thereby achieving a fixed assembly between the second oil baffle 2 and the housing 4.

[0046] Furthermore, for the first oil baffle 1 and the second oil baffle 2, the oil outlet ends of each first transverse oil hole 12 and each second transverse oil hole 22 correspond to the end windings. Specifically, to meet the aforementioned relative position requirements, the oil inlet end of each first transverse oil hole 12 is lower than the oil outlet end; the oil inlet end of each second transverse oil hole 22 is higher than the oil outlet end. Meanwhile, considering that when such inclined first transverse oil holes 12 and second transverse oil holes 22 are provided on injection molded parts, internal deformation and hole misalignment are likely to occur, in this embodiment, both the first oil baffle 1 and the second oil baffle 2 are 3D printed.

[0047] In the specific implementation process, with the assistance of the corresponding oil pump, at the corresponding position of the first oil baffle 1, cooling oil flows directly into the oil tank 11 through the oil channel 6 and then flows out through the first transverse oil hole 12, spraying onto the upper winding. Simultaneously, at the corresponding position of the second oil baffle 2, cooling oil flows through the oil channel 6 to the gap between it and the housing 4, and then flows out through each of the second transverse oil holes 22, spraying onto the upper winding. This achieves heat dissipation for the winding. From a structural perspective, compared to the traditional oil baffle structure (using a longitudinally stretched Z-shaped oil ring), the axial dimension of the transition section between the oil channel 6 and the oil holes on the oil baffle structure is shortened. From the perspective of manufacturing cost and structural reliability, the fixing method based on the first and second adhesive layers, and the 3D-printed first and second oil baffles 1 and 2, also avoid the manufacturing costs associated with injection molding. Furthermore, the surface-bonded fixing method offers higher structural reliability.

[0048] In this embodiment, to further improve the reliability of installation, a plurality of fixing ears are provided at intervals on the outer side walls of the first oil baffle 1 and the second oil baffle 2; each fixing ear has a fixing hole. Specifically, a fixing member 5 passes through each fixing hole to fix the first oil baffle 1, the second oil baffle 2 to the housing 4 and the stator core 3. Specifically, a plurality of first fixing ears 13 are provided at intervals on the outer side wall of the first oil baffle 1, and each first fixing ear 13 has a first fixing hole 13a. A plurality of second fixing ears 23 are provided at intervals on the outer side wall of the second oil baffle 2, and each second fixing ear 23 has a second fixing hole 23a. More specifically, the first fixing ears 13 and the second fixing ears 23 are arranged in a one-to-one correspondence, and the first fixing holes 13a and the second fixing holes 23a are arranged in a one-to-one correspondence. At this point, the fasteners 5 passing through the first fixing hole 13a, the second fixing hole 23a, the stator core 3, and the housing 4 will effectively fix the first oil baffle 1, the second oil baffle 2, the housing 4, and the stator core 3. In specific implementation, the fasteners 5 are bolts.

[0049] In addition, this embodiment also includes the following design: Figure 5 The motor described above includes the cooling device, and therefore has the advantages of lower overall manufacturing cost, better heat dissipation performance, and smaller axial dimension.

[0050] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Those skilled in the art to which this invention pertains can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of this invention shall be determined by the claims.

Claims

1. A cooling device suitable for motor stators, characterized in that, include: Oil passage, first oil baffle and second oil baffle; wherein, the first oil baffle and the second oil baffle are both annular structures; The oil passage is formed by the gap between the stator core and the housing; The bottom of the first oil baffle is provided with an oil groove, and the bottom surfaces of the two waist plates of the oil groove are respectively connected and fixed to the upper surfaces of the stator core and the housing. The oil passage is located directly below the oil groove. A number of first transverse oil holes are provided at intervals on the waist plates of the oil groove and the stator core. The lower end face of the second oil baffle is fixed to the protruding end of the housing, and the upper end face is fixed to the bottom surface of the stator core; and a gap is left between the outer peripheral wall of the second oil baffle and the inner circumferential side wall of the housing to allow cooling oil to flow through; wherein, a number of second transverse oil holes are spaced apart on the second oil baffle. The oil outlet ends of each of the first transverse oil holes and each of the second transverse oil holes correspond to the end windings, respectively.

2. The cooling device for motor stators according to claim 1, characterized in that, The oil inlet end of each first transverse oil hole is lower than the oil outlet end.

3. The cooling device for motor stators according to claim 1, characterized in that, The inlet end of each second transverse oil hole is higher than the outlet end.

4. The cooling device for motor stators according to claim 1, characterized in that, The oil tank has an annular inner chamfer.

5. The cooling device for motor stators according to claim 1, characterized in that, The first oil baffle is fixed to the housing and the stator core by a first adhesive layer; the second oil baffle is fixed to the housing and the stator core by a second adhesive layer.

6. The cooling device for motor stators according to claim 5, characterized in that, The bottom of the second oil baffle is provided with a rubber groove.

7. The cooling device for motor stators according to claim 1, characterized in that, Both the first and second oil baffles are provided with a number of fixing ears at intervals; each fixing ear is provided with a fixing hole; and a fixing component that is installed on the housing and the stator core passes through the fixing hole.

8. The cooling device for motor stators according to claim 1, characterized in that, The inner circumferential sidewall of the housing is provided with a plurality of arc-shaped protrusions arranged in a matrix, and the unused end face of each arc-shaped protrusion is attached to the outer circumferential wall of the stator core; wherein, the gap between each arc-shaped protrusion forms the oil passage.

9. The cooling device for motor stators according to claim 1, characterized in that, The stator core has a plurality of arc-shaped protrusions arranged in a matrix on its outer peripheral wall, and the unused end face of each arc-shaped protrusion is attached to the inner circumferential side wall of the housing; wherein, the gap between each arc-shaped protrusion forms the oil passage.

10. An electric motor, characterized in that, Includes the cooling device as described in any one of claims 1-9.

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