Water-cooled sealed electric machine

Abstract

The utility model discloses a water -cooling sealed motor, including motor shell, motor stator, motor rotor, motor shaft and bearing assembly, the motor rotor is equipped with on the motor shaft, and the motor stator is fixed in the inner wall of motor shell, and the motor stator is filled with insulating potting adhesive between motor shell, the bearing assembly includes fixed side bearing, movable side bearing and bearing seat, the bearing seat is fixedly connected with motor shell, and fixed side bearing, movable side bearing are assembled in the bearing mounting hole of bearing seat and motor shell respectively, the water channel and water channel cover are seted up on the motor shell, and the water channel is along the circumferential or axial distribution of motor shell, and the water channel cover is located the outside of water channel, the motor shell of the utility model adopts aluminium alloy material, and fills the insulating potting adhesive of good heat conductivity between motor stator and motor shell, can fastly transfer the coil heat to motor shell, and the motor shell is equipped with the water channel of circumferential or axial distribution, and high -efficiently takes away the heat through the water -cooling mode.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a water-cooled sealed motor. Background Technology

[0002] As a core component for power output, electric motors are widely used in industrial equipment, new energy vehicles, precision instruments, and other fields. With the increasing demand for miniaturization and higher power in equipment, traditional motors have gradually revealed several shortcomings: First, their heat dissipation performance is limited. Ordinary air-cooled motors rely on air convection for heat dissipation, which can easily lead to excessive temperature rise in confined spaces or high-power operating scenarios, resulting in decreased motor efficiency and shortened lifespan. Second, their sealing effect is poor, allowing dust, liquids, and other impurities to easily penetrate the motor, causing coil short circuits, bearing wear, and other malfunctions. Third, their assembly precision is insufficient; the positioning error between the bearings and the motor housing is relatively large, which can easily generate vibration during high-speed operation, affecting operational stability. Therefore, developing a motor that combines a compact structure, efficient heat dissipation, and reliable sealing is of significant practical importance. Utility Model Content

[0003] To address the aforementioned problems, this invention provides a water-cooled sealed motor that combines a compact structure, efficient heat dissipation, and reliable sealing.

[0004] Therefore, the technical solution of this utility model is: a water-cooled sealed motor, including a motor housing, a motor stator, a motor rotor, a motor shaft, and a bearing assembly; the motor rotor is sleeved on the motor shaft, the motor stator is fixed to the inner wall of the motor housing, and insulating potting compound is filled between the motor stator and the motor housing; the bearing assembly includes a fixed-side bearing, a movable-side bearing, and a bearing seat, the bearing seat is fixedly connected to the motor housing, and the fixed-side bearing and the movable-side bearing are respectively assembled in the bearing mounting holes of the bearing seat and the motor housing; the motor housing has water channels and water channel covers, the water channels are distributed along the circumference or axial direction of the motor housing, the water channel covers are located outside the water channels, and are fixedly sealed to the motor housing by a sealing element.

[0005] Based on the above scheme and as a preferred embodiment of the above scheme: a positioning retaining ring and a bushing are fitted on the motor shaft, the positioning retaining ring is located on the outside of the fixed side bearing, and the bushing is located on the inside of the movable side bearing.

[0006] Based on the above scheme and as a preferred embodiment of the above scheme: the motor housing is an integrally machined aluminum alloy component, the bottom inner side of the motor housing is provided with a first bearing mounting hole to accommodate the movable side bearing, and the end of the motor housing is provided with a positioning step that cooperates with the bearing seat for installation.

[0007] Based on the above scheme and as a preferred embodiment of the above scheme: the bearing assembly further includes a wave spring, which is located between the movable side bearing and the first bearing mounting hole.

[0008] Based on the above scheme and as a preferred embodiment of the above scheme: the motor shaft is provided with a shaft end cover on the side facing the motor housing, and the shaft end cover is fixed to the motor shaft by screws.

[0009] Based on the above scheme and as a preferred embodiment of the above scheme: the bearing housing is integrally machined, the bearing housing has a second bearing mounting hole on the side facing the motor housing, and a protruding positioning outer edge on the other side of the bearing housing; the bearing housing is made of aluminum alloy, cast iron or steel.

[0010] Based on the above scheme and as a preferred embodiment of the above scheme: it also includes a lubrication component, which includes an oil collection cover, an oil passage, and a plug; the oil collection cover is installed on the end face of the bearing housing, and the oil passage is distributed along the axial and radial directions of the motor housing, connecting the movable side bearing and the oil collection cover; the end face of the bearing housing is also provided with an oil leakage hole, and the oil passage is connected to an external oil tank through the oil leakage hole; the interface of the oil passage can be sealed with a plug.

[0011] Based on the above scheme and as a preferred embodiment of the above scheme: the motor housing is a motor housing for a permanent magnet synchronous motor or an asynchronous induction motor.

[0012] Compared with the prior art, the beneficial effects of this utility model are: The motor housing is made of materials with excellent thermal conductivity, such as aluminum alloy, which has strong heat dissipation capacity. The space between the motor stator and the motor housing is filled with insulating potting compound with good thermal conductivity, which can quickly transfer the heat of the coil to the motor housing. The motor housing has water channels distributed circumferentially or axially, which can efficiently remove heat through water cooling. The heat dissipation performance is far superior to that of ordinary air-cooled motors, enabling motors of the same size to achieve higher power operation.

[0013] The motor coil is sealed with insulating potting compound, which can effectively isolate impurities such as dust and liquid, and reduce the risk of coil short circuit. With the sealing junction box, the motor mounting surface and the equipment are sealed by the sealing ring, and there are no other leakage points, which can achieve complete sealing and is suitable for harsh working conditions.

[0014] The bearing housing mounting and positioning steps and the movable side bearing mounting holes of the motor housing can be machined in one go. The positioning outer edge of the bearing housing and the fixed side bearing mounting holes can also be machined in one go. High-precision machining and assembly ensure the positioning accuracy of the bearing and the motor housing, greatly reducing vibration during high-speed operation and improving operational stability.

[0015] Equipped with lubrication components such as an oil collection cap and oil passage, the oil collection cap can collect lubricating oil and deliver it precisely to the moving side bearing through the oil passage to ensure sufficient bearing lubrication; the lubricating oil flows back to the external oil tank through the oil leakage hole to form a circulating lubrication, which significantly extends the service life of the bearing.

[0016] 5. The wave spring on the motor shaft can provide preload to the bearing and provide axial compensation for the thermal expansion of the motor shaft, adapting to the operating requirements under different working conditions. It can be adapted to various motor types such as permanent magnet synchronous motors or asynchronous induction motors. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the structure of this utility model; Figure 2 for Figure 1 A magnified view of point A; Figure 3 for Figure 1 A magnified view of point B; Figure 4 This is a structural schematic diagram of one side of the bearing housing of this utility model; Figure 5 This is a schematic diagram of the waterway structure of this utility model.

[0018] The markings in the diagram are as follows: motor housing 1, first bearing mounting hole 11, positioning step 12, motor stator 2, motor rotor 3, motor shaft 4, insulating potting compound 5, fixed side bearing 61, movable side bearing 62, bearing seat 63, second bearing mounting hole 631, positioning outer edge 632, bushing 64, shaft end cover 65, wave spring 66, positioning retaining ring 67, water channel 71, water channel cover 72, oil collection cover 81, plug 82, first oil passage 83, second oil passage 84, oil leakage hole 85. Detailed Implementation

[0019] In the description of this utility model, it should be noted that the directional terms such as "center", "horizontal (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation and positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. They should not be construed as limiting the specific protection scope of this utility model.

[0020] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features. Thus, the use of "first" and "second" to define a feature may explicitly or implicitly include one or more of that feature. In the description of this utility model, "several" or "a number" means two or more, unless otherwise explicitly specified.

[0021] See the attached drawings. The water-cooled sealed motor described in this embodiment can be a permanent magnet synchronous motor or an asynchronous induction motor, which includes a motor housing 1, a motor stator 2, a motor rotor 3, a motor shaft 4, and a bearing assembly; wherein: The motor housing 1 is made of aluminum alloy or other metals with good thermal conductivity. This high thermal conductivity significantly improves the motor's heat dissipation performance compared to ordinary air-cooled motors, allowing motors of the same size to operate at higher power. The motor housing 1 is a one-piece machined component. The bottom inner side of the motor housing 1 has a first bearing mounting hole 11 to accommodate the movable side bearing, and the end of the motor housing 1 has a positioning step 12 for installation with the bearing seat.

[0022] The motor stator 2 is fixed to the inner wall of the motor housing 1, and the space between the motor stator 2 and the motor housing 1 is filled with insulating potting compound 5. The potting compound has good thermal conductivity, resulting in good coil heat dissipation, and the motor coil is less prone to damage after being sealed with insulating potting compound. The motor rotor 3 is placed in the middle of the motor stator 2 and is sleeved on the motor shaft 4.

[0023] The insulating potting compound 5 filling the gap between the motor stator 2 and the motor housing 1 forms a sealed barrier, preventing external impurities from entering the coil area. With the use of a sealed junction box, the motor mounting surface and the equipment are tightly fitted by a sealing ring, and the water channels are sealed by water channel covers and seals. There are no leakage points in the bearing assembly and other parts, ultimately achieving complete sealing of the motor.

[0024] A bearing assembly is installed between the motor shaft 4 and the motor housing 1. The bearing assembly includes a fixed-side bearing 61, a movable-side bearing 62, and a bearing seat 63. The bearing seat 63 is made of aluminum alloy, cast iron, or steel and is integrally machined. The bearing seat 63 has a second bearing mounting hole 631 on the side facing the motor housing 1, and a protruding positioning outer edge 632 on the other side. The positioning outer edge 632 abuts against the positioning step 12 at the end of the motor housing 1 and is fixed by bolts. The positioning outer edge 632 of the bearing seat 63 protrudes from the end of the motor housing and can be used for positioning with the mounting surface.

[0025] The key positioning structures of the motor housing 1 (positioning step 12, first bearing mounting hole 11) and the key positioning structures of the bearing seat 63 (positioning outer edge 632, second bearing mounting hole 631) are all manufactured using a one-time machining process, eliminating positioning errors caused by multiple machining processes from the source.

[0026] The motor shaft 4 is fitted with a bushing 64 and a movable side bearing 62 at the end facing the motor housing 1, and an end cap 65 is provided at the end of the motor shaft 4, which is fixed to the motor shaft 64 by screws. The movable side bearing 62 is disposed in the first bearing mounting hole 11 of the motor housing 1, and a wave spring 66 is provided between the movable side bearing 62 and the first bearing mounting hole 11. The wave spring 66 provides preload to the two bearings and provides axial length compensation when the motor shaft expands due to heat.

[0027] The motor shaft 4 is fitted with a positioning retaining ring 67 and a fixed-side bearing 61 on the side facing the bearing housing 63. The fixed-side bearing 61 is placed in the second bearing mounting hole 631 of the bearing housing 63. The positioning retaining ring 67 is used to separate and position the fixed-side bearing 61 and the coupling mounted on the motor.

[0028] The motor housing 1 has water channels 71 and water channel covers 72. The water channels 71 are distributed circumferentially or axially along the motor housing 1. The water channel covers 72 are located outside the water channels and are fixedly sealed to the motor housing 1 by a sealing element. The water channel covers 72 are used to close the water channels 71. When the motor is running, the heat generated by the coil is first transferred to the aluminum alloy motor housing through insulating potting compound. The motor housing itself transfers the heat to the water channels formed on it through thermal conduction. The coolant flows in the water channels, exchanges heat with the motor housing, and carries away the heat, thereby quickly reducing the internal temperature of the motor and avoiding excessive temperature rise that could lead to decreased efficiency or shortened lifespan.

[0029] The motor housing 1 also includes a lubrication assembly, which includes an oil collection cap 81, oil passages, and a plug 82. The oil collection cap 81 is installed on the end face of the bearing seat 63. The oil passage is divided into a first oil passage 83 distributed along the axial direction of the motor housing 1 and a second oil passage 84 distributed along the radial direction of the motor housing 1. The first oil passage 83 passes through the bearing seat 63 and connects to the oil collection cap 81. The second oil passage 84 connects the movable bearing 62 and the first oil passage 83. The end face of the bearing seat 63 is also provided with an oil leakage hole 85, through which the oil passage connects to an external oil tank. Unused interfaces on the second oil passage 84 can be sealed with the plug 82. The oil collection cap 81 collects lubricating oil and provides lubricating oil to the movable bearing 62 through the first oil passage 83 and the second oil passage 84. After flowing out, the lubricating oil flows back to the oil tank through the oil leakage hole 85. The oil collection cap 81 collects and stores lubricating oil, which is then precisely delivered to the movable bearing 62, which is away from the bearing seat, through the oil passages distributed along the axial and radial directions of the motor housing 1. After lubrication, the lubricating oil flows out through the oil leakage hole 85 on the end face of the bearing housing 63 and eventually flows back to the external oil tank, forming a closed-loop circulation lubrication system to ensure that the bearing is in a good lubrication condition for a long time.

[0030] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A water-cooled sealed motor, comprising a motor housing, a motor stator, a motor rotor, a motor shaft, and a bearing assembly; wherein the motor rotor is sleeved on the motor shaft, and the motor stator is fixed to the inner wall of the motor housing, characterized in that: The space between the motor stator and the motor housing is filled with insulating potting compound; the bearing assembly includes a fixed-side bearing, a movable-side bearing, and a bearing housing, the bearing housing being fixedly connected to the motor housing, and the fixed-side bearing and the movable-side bearing being respectively assembled in the bearing mounting holes of the bearing housing and the motor housing; the motor housing has water channels and water channel covers, the water channels being distributed along the circumference or axial direction of the motor housing, the water channel covers being located outside the water channels, and being fixedly sealed to the motor housing by a sealing element.

2. The water-cooled sealed motor as described in claim 1, characterized in that: The motor shaft is fitted with a positioning retaining ring and a bushing. The positioning retaining ring is located on the outside of the fixed side bearing, and the bushing is located on the inside of the movable side bearing.

3. A water-cooled sealed motor as described in claim 1, characterized in that: The motor housing is an integrally machined aluminum alloy component. The bottom inner side of the motor housing is provided with a first bearing mounting hole to accommodate the movable side bearing, and the end of the motor housing is provided with a positioning step that cooperates with the bearing seat for installation.

4. A water-cooled sealed motor as described in claim 3, characterized in that: The bearing assembly also includes a wave spring located between the movable side bearing and the first bearing mounting hole.

5. A water-cooled sealed motor as described in claim 1, characterized in that: The motor shaft is provided with a shaft end cover on the side facing the motor housing, and the shaft end cover is fixed to the motor shaft with screws.

6. A water-cooled sealed motor as described in claim 1, characterized in that: The bearing housing is integrally machined, with a second bearing mounting hole on the side facing the motor housing and a protruding positioning outer edge on the other side; the bearing housing is made of aluminum alloy, cast iron or steel.

7. A water-cooled sealed motor as described in claim 1, characterized in that: It also includes a lubrication assembly, which includes an oil collection cap, an oil passage, and a plug. The oil collection cap is installed on the end face of the bearing housing, and the oil passage is distributed along the axial and radial directions of the motor housing, connecting the movable side bearing and the oil collection cap. The end face of the bearing housing is also provided with an oil leakage hole, through which the oil passage is connected to an external oil tank. The interface of the oil passage can be sealed with a plug.

8. A water-cooled sealed motor as described in claim 1, characterized in that: The motor housing is a permanent magnet synchronous motor or an asynchronous induction motor housing.

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