CN113162332A - Oil-cooled motor with overheat protection mechanism - Google Patents
Oil-cooled motor with overheat protection mechanism Download PDFInfo
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- CN113162332A CN113162332A CN202110387106.1A CN202110387106A CN113162332A CN 113162332 A CN113162332 A CN 113162332A CN 202110387106 A CN202110387106 A CN 202110387106A CN 113162332 A CN113162332 A CN 113162332A
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- oil
- fan
- motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
- H02K9/197—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil in which the rotor or stator space is fluid-tight, e.g. to provide for different cooling media for rotor and stator
Abstract
The invention discloses an oil-cooled motor with an overheat protection mechanism, relates to the technical field of motor cooling, and can reduce local hot spots of the motor while reducing oil resistance and improve the cooling effect. The invention comprises the following steps: the inner wall of the rotor is fixedly connected with the outer wall of the rotating shaft, the stator is installed on the outer side of the rotor, a gap is reserved between the stator and the rotor, the oil circulating oil way is installed on the periphery of the stator, the outlet of the oil circulating oil way is connected with the oil inlet of the oil spraying oil way, and the bottom of the oil cooling motor is provided with the oil returning oil way. A fan is arranged on one side of the rotating shaft, the wind direction of the fan faces the rotor, and an oil outlet of the oil spraying oil path is arranged in front of the fan. Set up the vent on the one side casing of keeping away from the fan at oil-cooled motor, the guard shield passes through the gear setting in the casing outside, and the high temperature relief valve sets up at motor side end cover, and the rack is connected to the actuating spring bottom of high temperature relief valve, rack and gear engagement, and when the high temperature relief valve was closed, the guard shield covered in the vent outside, and when the high temperature relief valve was opened, the guard shield moved away, and vent and motor external environment intercommunication.
Description
Technical Field
The invention relates to the technical field of motor cooling, in particular to an oil-cooled motor with an overheat protection mechanism.
Background
The aviation motor inevitably generates loss during operation, the loss is converted into heat energy to cause the temperature of the motor to rise, and if no other medium absorbs the heat energy, the temperature of the motor continuously rises. Excessive temperatures can cause adverse effects, including: the mechanical strength of the material is low, the oxidation speed of the metal material is high, the elasticity of the material is changed, the resistivity of the winding is increased, the service life of the winding insulation material is shortened, the normal power supply of an airplane system cannot be ensured in serious conditions, and serious accidents are possible to happen.
The aviation motor is sensitive to weight due to the particularity of the operation environment, generally, air or oil carried by the aviation motor is directly adopted as a cooling medium, the oil has higher specific heat capacity and better heat conductivity than the air, and therefore the heat generated by the motor can be effectively taken away by adopting oil cooling, so that the motor works within a safe temperature.
But the oil with high viscosity can generate higher flow resistance, so that the power required by the oil pump is high, and the extra power can extract more energy from the aircraft engine, thereby increasing the oil consumption and reducing the aircraft range; although the direct contact between the oil-spraying cooling and the heating source can efficiently dissipate heat, the overall cooling effect is reduced due to the uneven distribution of the oil in the space of the cavity of the motor, and the motor has the problem of local hot spots; when a plurality of oil return ports are formed in the oil cooling motor, the unequal flow resistance of each oil return path can lead to the fact that part of the oil return ports cannot return oil in time, oil accumulation exists in a cavity, and the rotor can stir oil to generate extra mechanical loss and reduce the efficiency of the motor system.
In addition, the cooling medium of the aircraft motor generally comes from an aircraft engine lubricating oil system, the possibility of failure is higher due to the complex structure, more oil conveying and oil returning parts of a pipeline, once the oil supply and oil return are failed, the heat of the motor cannot be dissipated in time, the temperature of the motor is rapidly increased, and serious adverse effect is caused on the whole aircraft system in severe cases.
Disclosure of Invention
The invention provides an oil-cooled motor with an overheating protection mechanism, which can increase the contact area between oil and a motor heating source, improve the overall cooling effect, and timely switch to an air-cooled state when the oil-cooled function of the motor fails, thereby ensuring that the motor can safely and stably run when the oil-cooled function fails.
In order to achieve the purpose, the invention adopts the following technical scheme:
oil-cooled electric machine with overheat protection mechanism, comprising: the high-temperature safety valve comprises a stator, a rotor, a rotating shaft, a fan, a protective cover, a gear, a rack, a high-temperature safety valve, an oil circulating oil way, an oil spraying oil way and an oil returning oil way.
The inner wall of the rotor is fixedly connected with the outer wall of the rotating shaft, the stator is installed on the outer side of the rotor, a gap is reserved between the stator and the rotor, the oil circulating oil way is installed on the periphery of the stator, the outlet of the oil circulating oil way is connected with the oil inlet of the oil spraying oil way, and the bottom of the oil cooling motor is provided with the oil returning oil way.
A fan is arranged on one side of the rotating shaft, the wind direction of the fan faces the rotor, and an oil outlet of the oil spraying oil path is arranged in front of the fan. Set up the vent on the one side casing of keeping away from the fan at oil-cooled motor, the guard shield passes through the gear setting in the casing outside, and the high temperature relief valve sets up in the vent top, and the rack is connected to the actuating spring bottom of high temperature relief valve, rack and gear engagement, and when the high temperature relief valve was closed, the guard shield covered in the vent outside, and when the high temperature relief valve was opened, the guard shield moved away, vent and the external environment intercommunication of motor.
Furthermore, the oil circulation oil circuit comprises an oil inlet, an oil circulation pipeline and an oil circulation oil circuit outlet. The circulating oil pipeline is formed by connecting a plurality of circular pipelines in series, an oil inlet is formed in the top end of the circulating oil pipeline, the oil inlet serves as an inlet, the circulating oil pipeline is divided into two paths, the two divided circulating oil pipelines surround the outer side of the stator in a circular shape, and finally join at the top of the stator, and the joint is connected with an outlet of the circulating oil pipeline.
Furthermore, the corners of the oil circulation oil path, the oil spraying oil path and the oil return oil path are chamfers.
Furthermore, the oil pumping opening of the oil return oil path is positioned right below the gap between the fan and the stator.
Furthermore, the fan is connected with the rotating shaft through a flexible propeller hub, and the flexible propeller hub buffers impact on the fan when the motor is suddenly stopped/suddenly rotated through slight deformation.
Furthermore, the surface of the blade of the fan is covered with a reinforced film, and the reinforced film is made of Kevlar or carbon fiber materials and has the characteristics of impact resistance and corrosion resistance.
Further, the width of the fan blade is proportional to the radius.
Further, the radius of the flexible hub is proportional to the blade radius.
The invention has the beneficial effects that:
the high-temperature safety valve and the vent are additionally arranged at the end of the motor tail shell, if the temperature is too high, the high-temperature safety valve acts to open the movable protective cover additionally arranged at the tail shell, the motor cavity is opened from a closed state, and the cooling mode is changed from oil cooling to forced air cooling, so that the emergency cooling effect is achieved;
the circulating oil circuit is shunted for multiple times, so that the flow resistance of the oil circuit is low, the power of an oil pump is effectively reduced, and the extraction of the power of an aeroengine is reduced;
the combination structure of the oil spraying oil path and the fan ensures that the sprayed oil directly contacts the heating source of the motor, the cooling efficiency is high, and the fan further improves the contact area and the convection heat transfer coefficient of the oil and the heating source, thereby reducing local hot spots and improving the overall cooling effect;
the oil flows into an oil return circuit at the bottom of the motor under the action of gravity, the oil return circuit is symmetrical relative to two ends of the oil outlet and has equal flow resistance, and the phenomenon that accumulated oil in a motor cavity cannot be recovered due to the difference of the flow resistance of the oil return circuit is avoided, so that the phenomenon that the oil is stirred by a rotor is avoided.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a schematic view of the structure of the oil path;
FIG. 3 is a schematic structural view of an oil circulation passage;
FIG. 4 is a schematic structural diagram of an oil spraying path;
FIG. 5 is a schematic structural view of an oil return path;
FIG. 6 is a schematic view of the fan;
FIG. 7 is a schematic view of the installation of a high temperature safety valve at the end cap of the motor;
fig. 8 is an operation principle diagram of the high temperature safety valve.
1-stator, 2-rotor, 3-tail shell, 4-bearing, 5-machine shell, 6-rotating shaft, 7-oil circulation oil path, 71-oil inlet, 72-oil circulation path, 73-oil circulation oil path outlet, 8-oil spraying oil path, 9-oil return oil path, 91-oil return port, 92-oil return line, 93-oil pumping port, 10-fan, 11-blade reinforced membrane, 12-ventilation port, 13-shield, 14-gear, 15-rack, 16-high temperature safety valve, and 17-wind direction.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, the present invention will be further described in detail with reference to the following detailed description.
An oil-cooled electric machine with an overheat protection mechanism is shown in fig. 1. The inner wall of the rotor 2 is fixedly connected with the outer wall of the rotating shaft 6, the stator 1 is installed on the outer side of the rotor 2, and a gap is reserved between the stator 1 and the rotor 2.
The oil circulation path 7 is installed inside the casing 5, on the outer periphery of the stator 1. As shown in fig. 2 and 3, the oil circulation passage 7 includes an oil inlet 71, an oil circulation passage 72, and an oil circulation passage outlet 73. The oil circulation pipeline 72 is formed by connecting a plurality of circular pipelines in series, the top end of the left side of the oil circulation pipeline 72 is provided with an oil inlet 71, the oil inlet 71 is used as an inlet, the oil circulation pipeline 72 is divided into two paths, the two paths of pipelines wind around the outer side of the stator 1 in a circular shape and finally join at the top of the stator 1, and the joint is connected with an oil circulation pipeline outlet 73. Under the condition that the total flow is not changed, the flow resistance can be greatly reduced through the flow division of the oil inlet 71, and the energy loss is reduced.
The energy loss caused by the flow resistance is related to the pipe diameter and the length of the oil circuit and the characteristics of the oil, and the calculation process is as follows:
in the above formula, Q represents the oil flow, upsilon represents the oil speed, S represents the cross-sectional area of the oil passage, l represents the length of the oil passage, g represents the gravity acceleration, d represents the equivalent diameter of the oil passage, lambda represents the on-way resistance coefficient, zeta represents the local resistance coefficient when the ruler diameter and the direction of the oil passage change, and h representsfAnd hmRespectively representing the on-way energy loss and the local energy loss. Therefore, the energy loss and the flow rate present a quadratic relation according to the formula, and the flow division through the pipeline can play the roles of reducing the flow resistance and reducing the energy loss under the condition that the total flow rate is not changed. In order to keep the cooling effect of each oil way balanced and prevent local hot spots, namely the sizes of the oil ways are kept consistent.
A fan 10 is arranged on one side of the rotating shaft 6, the wind direction 17 of the fan 10 faces the rotor 2, and the fan 10 is fixedly connected with the rotating shaft 6 and rotates along with the rotating shaft 6. The oil spraying oil path 8 is a right-angle oil path, as shown in fig. 4, an oil inlet of the oil spraying oil path 8 is connected with the oil circulating outlet 73, and an oil outlet of the oil spraying oil path 8 is arranged in front of the fan 10. The oil is sprayed out from an oil outlet of the oil spraying oil path 8, is influenced by the fan blades rotating at high speed and the rotating air flow around the fan blades when passing through the fan 10, and is sputtered along the circumferential direction to contact the stator 1 and the rotor 2. Because the wind direction is the same with the outlet direction of the oil spraying oil path 8, the splashed oil can be accelerated, and the convection heat transfer coefficient of the oil is further improved.
The radial length of the fan 10 is larger than the radial length from the rotating shaft 6 to the outlet of the oil spraying oil path 8. The fan 10 is wound with a blade reinforcing film 11 at the position facing the outlet of the oil spraying passage 8, as shown in fig. 6, the film is made of impact-resistant, corrosion-resistant, high-temperature-resistant and low-density materials, such as kevlar and carbon fiber, and the width of the blade of the fan increases with the increase of the length of the blade at the position where the reinforcing film 11 is installed, so as to prevent the blade reinforcing film 11 from being thrown off under the action of centrifugal force.
The bottom of the oil cooling motor is provided with an oil return path 9, the oil return path 9 comprises an oil return opening 91, an oil return pipeline 92 and an oil pumping opening 93, as shown in fig. 5, the top of the oil return pipeline 92 is provided with the oil return opening 91, and the bottom of the oil return pipeline 92 is provided with the oil pumping opening 93.
The oil sprayed from the outlet of the oil spraying path 8 is accelerated by the rotating fan 10 to sputter on the motor heating source, flows into the oil return port 91 at the bottom of the casing under the action of gravity, and is pumped out from the oil pumping port 93 by the oil pump through the oil return pipeline 92, thereby completing one cooling cycle.
In order to further reduce the oil resistance, the corners of the oil circulation path 7, the oil spraying path 8 and the oil return path 9 are all processed into round corners, so that the oil resistance of the oil circulation path and the oil spraying path can be reduced by about 5-20% again.
A vent 12 is arranged on the end cover of the motor far away from the fan, a shield 13 is arranged outside the vent 12, and the shield 13 is connected with the motor shell through a gear 14, as shown in fig. 7. The high-temperature safety valve 16 is arranged on the tail shell 3 on the fan side, the installation position is located below the oil injection port and in the area above the rotating shaft, the bottom of an actuating spring of the high-temperature safety valve 16 is connected with a rack 15, and the rack 15 is meshed with the gear 14, as shown in fig. 8. When the high temperature safety valve 16 is closed, the shield 13 covers just outside the vent 12.
When the motor oil cooling system breaks down, such as oil filtration filtering failure, oil pump trouble, pipeline leakage and other troubles, the heat in the motor can not be dissipated in time, which will cause the temperature of the motor to rise, the air pressure in the cavity rises, when the temperature and the air pressure rise reach the opening critical value of the high-temperature safety valve 16, the high-temperature safety valve 16 is opened, the actuating spring is pressed downwards, the rack 15 slides downwards, the gear 14 meshed with the rack 15 rotates to drive the shield 13 to move, the vent 12 is exposed, the interior of the motor is communicated with the external environment, the motor is converted from the oil cooling state to the air cooling state due to the rotation of the fan, an emergency cooling mode is provided for the motor, the internal temperature of the motor is reduced, and the smooth operation for a certain time during the trouble is ensured.
The invention has the beneficial effects that:
the high-temperature safety valve and the vent are additionally arranged at the end of the motor tail shell, if the temperature is too high, the high-temperature safety valve acts to open the movable protective cover additionally arranged at the tail shell, the motor cavity is opened from a closed state, and the cooling mode is changed from oil cooling to forced air cooling, so that the emergency cooling effect is achieved;
the circulating oil circuit is shunted for multiple times, so that the flow resistance of the oil circuit is low, the power of an oil pump is effectively reduced, and the extraction of the power of an aeroengine is reduced;
the combination structure of the oil spraying oil path and the fan ensures that the sprayed oil directly contacts the heating source of the motor, the cooling efficiency is high, and the fan further improves the contact area and the convection heat transfer coefficient of the oil and the heating source, thereby reducing local hot spots and improving the overall cooling effect;
the oil flows into an oil return circuit at the bottom of the motor under the action of gravity, the oil return circuit is symmetrical relative to two ends of the oil outlet and has equal flow resistance, and the phenomenon that accumulated oil in a motor cavity cannot be recovered due to the difference of the flow resistance of the oil return circuit is avoided, so that the phenomenon that the oil is stirred by a rotor is avoided.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. Oil-cooled electric machine with overheat protection mechanism, comprising: the high-temperature safety valve comprises a stator, a rotor, a rotating shaft, a fan, a protective cover, a gear, a rack, a high-temperature safety valve, an oil circulating oil way, an oil spraying oil way and an oil returning oil way;
the oil cooling motor is characterized in that an oil circulating path is arranged at the periphery of the stator, an outlet of the oil circulating path is connected with an oil inlet of an oil spraying path, and an oil returning path is arranged at the bottom of the oil cooling motor;
a fan is arranged on one side of the rotating shaft, the wind direction of the fan faces the rotor, and an oil outlet of the oil spraying oil path is arranged in front of the fan;
the fan-free high-temperature safety valve is characterized in that a vent is formed in a shell on one side, away from the fan, of the oil-cooled motor, a protective cover is arranged on the outer side of the shell through a gear, a high-temperature safety valve is arranged above the vent, the bottom of an actuating spring of the high-temperature safety valve is connected with a rack, the rack is meshed with the gear, when the high-temperature safety valve is closed, the protective cover covers the outer side of the vent, when the high-temperature safety valve is opened, the protective cover is moved away, and the vent is communicated with the external environment of the motor.
2. The oil-cooled motor with an overheat protection mechanism according to claim 1, wherein the oil circulation path includes an oil inlet, an oil circulation path outlet;
the circulating oil pipeline is formed by connecting a plurality of circular pipelines in series, an oil inlet is formed in the top end of the circulating oil pipeline, the oil inlet serves as an inlet, the circulating oil pipeline is divided into two paths, the two divided circulating oil pipelines surround the outer side of the stator in a circular shape, and finally join at the top of the stator, and the joint is connected with an outlet of the circulating oil pipeline.
3. The oil-cooled motor with the overheat protection mechanism according to claim 1, wherein corners of the oil circulation path, the oil spraying path and the oil returning path are chamfered.
4. The oil-cooled motor with an overheat protection mechanism according to claim 1, wherein the oil suction port of the oil return passage is located right below a gap between the fan and the stator.
5. The oil cooled motor having an overheat protection mechanism according to claim 1, wherein said fan is connected to said rotating shaft through a flexible hub.
6. The oil-cooled motor with the overheat protection mechanism according to claim 1, wherein a surface of the blade of the fan is covered with a reinforcing film, and the reinforcing film is made of Kevlar or a carbon fiber material.
7. The oil-cooled motor having an overheat protection structure according to claim 1, wherein a width of the fan blade is proportional to a radius.
8. The oil-cooled motor with an overheat protection structure according to claim 1, wherein a radius of said flexible hub is proportional to a radius of the fan blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387106.1A CN113162332B (en) | 2021-04-09 | 2021-04-09 | Oil-cooled motor with overheat protection mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110387106.1A CN113162332B (en) | 2021-04-09 | 2021-04-09 | Oil-cooled motor with overheat protection mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN113162332A true CN113162332A (en) | 2021-07-23 |
| CN113162332B CN113162332B (en) | 2022-10-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110387106.1A Active CN113162332B (en) | 2021-04-09 | 2021-04-09 | Oil-cooled motor with overheat protection mechanism |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532307A (en) * | 2013-10-21 | 2014-01-22 | 南车株洲电力机车研究所有限公司 | Permanent magnet synchronous traction motor and oil cooling device thereof |
| WO2020130200A1 (en) * | 2018-12-20 | 2020-06-25 | 엘지전자 주식회사 | Motor |
| CN111446649A (en) * | 2020-04-01 | 2020-07-24 | 武汉船用机械有限责任公司 | Distribution box |
-
2021
- 2021-04-09 CN CN202110387106.1A patent/CN113162332B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532307A (en) * | 2013-10-21 | 2014-01-22 | 南车株洲电力机车研究所有限公司 | Permanent magnet synchronous traction motor and oil cooling device thereof |
| WO2020130200A1 (en) * | 2018-12-20 | 2020-06-25 | 엘지전자 주식회사 | Motor |
| CN111446649A (en) * | 2020-04-01 | 2020-07-24 | 武汉船用机械有限责任公司 | Distribution box |
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| Publication number | Publication date |
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| CN113162332B (en) | 2022-10-11 |
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