CN111654135A - Interior heat dissipation formula DC brushless motor and hand-held type lithium electric tool - Google Patents
Interior heat dissipation formula DC brushless motor and hand-held type lithium electric tool Download PDFInfo
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- CN111654135A CN111654135A CN202010573926.5A CN202010573926A CN111654135A CN 111654135 A CN111654135 A CN 111654135A CN 202010573926 A CN202010573926 A CN 202010573926A CN 111654135 A CN111654135 A CN 111654135A
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- rotating shaft
- oil
- storage tank
- cooling oil
- oil storage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/12—Stationary parts of the magnetic circuit
- H02K1/20—Stationary parts of the magnetic circuit with channels or ducts for flow of cooling medium
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
- H02K5/161—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields radially supporting the rotary shaft at both ends of the rotor
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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
- H02K9/193—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil with provision for replenishing the cooling medium; with means for preventing leakage of the cooling medium
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- Motor Or Generator Cooling System (AREA)
Abstract
The invention discloses an internal heat dissipation type direct current brushless motor and a handheld lithium electric tool, which comprise a rotor, wherein the rotor comprises a rotating shaft, a rotor core, a commutator and a gasket, wherein the rotor core is covered in the middle of the rotating shaft; the stator is sleeved on the outer side of the rotor core and comprises a stator core and a stator winding; a first cooling oil storage tank and a second cooling oil storage tank; the first cooling oil storage tank is communicated with the second cooling oil storage tank after being respectively connected with the stator core and the rotating shaft; the pivot is provided with the oil circuit passageway that runs through the both ends of pivot are provided with first oil circuit headstock gear and second oil circuit headstock gear, can realize the automatic switching of the state of opening and close of oil circuit along with the rising of temperature to can realize the automatic heat dissipation to the motor, the motor need not to carry on fan and remaining radiator unit, and the hand-held type lithium electric tool that uses this motor can not set up the thermovent, has simplified inner structure, and dustproof noise reduction effect is better simultaneously.
Description
Technical Field
The invention relates to the technical field of brushless motors, in particular to an internal heat dissipation type direct current brushless motor and a handheld lithium electric tool using the same.
Background
A brushless dc motor is a kind of synchronous motor, and the rotation speed of a motor rotor is affected by the speed of a rotating magnetic field of a motor stator and the number (P) of rotor poles: n =60 × f/P. Under the condition of fixed number of poles of the rotor, the rotating speed of the rotor can be changed by changing the frequency of the rotating magnetic field of the stator. The brushless dc motor is a synchronous motor with an electronic controller (controller) to control the frequency of the rotating magnetic field of the stator and feed back the rotation speed of the rotor of the motor to the control center for repeated correction, so as to achieve a mode approaching the characteristics of the dc motor. Namely, the brushless DC motor can still control the rotor of the motor to maintain a certain rotating speed when the load changes within the rated load range.
The existing brushless direct current motor has the following defects:
the heat is dissipated by externally arranging a fan on the rotating shaft, so that the motor is poor in structural compactness. For example, chinese patent application No. 2010105778463, published as 2012 and No. 5/30, entitled "a dc brushless motor structure" discloses a dc brushless motor in which heat is dissipated by an external fan.
Overload protection of the motor is achieved by providing thermal protection on the circuit. The thermal protection works in such a way that current rises due to overload, heat is increased due to current rise, and temperature rises due to heat increase, and when the temperature rises to exceed a set value, a circuit is disconnected to stop power supply, namely, a protection action is generated. Overload protection by thermal protection therefore has the following disadvantages: the temperature rise can lead to accelerated aging, poor timeliness and poor reliability of electric wires and electronic components.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides an internal heat dissipation type direct current brushless motor and a handheld lithium battery tool using the brushless motor, which can effectively solve the problems pointed out in the background technology.
The technical scheme adopted by the invention for solving the technical problems is as follows: an internal heat dissipation type DC brushless motor comprises,
the rotor comprises a rotating shaft, a rotor iron core covered in the middle of the rotating shaft, a commutator and a gasket;
the stator is sleeved on the outer side of the rotor core and comprises a stator core and a stator winding;
a first cooling oil storage tank including a first oil outlet;
a second cooling oil storage tank including a first oil inlet;
the first bearing is arranged at the end part of the first end of the rotating shaft, the inner ring rotates along with the rotating shaft, and the outer ring is fixed on the carrier;
the second bearing is arranged at the second end part of the rotating shaft, the inner ring rotates along with the rotating shaft, and the outer ring is fixed on the carrier;
the output gear is arranged at the first end of the rotating shaft and rotates along with the rotating shaft;
the first connecting sleeve comprises a first rotating shaft connecting section and a first oil path connecting section, the first rotating shaft connecting section is butted with the first end of the rotating shaft and is fixed on the inner ring of the first bearing to rotate along with the rotating shaft, the first oil path connecting section is fixed and cannot rotate and is connected with the first cooling oil storage tank, and the first rotating shaft connecting section is connected with the first oil path connecting section through a first pipe sleeve;
the second connecting sleeve comprises a second rotating shaft connecting section and a second oil path connecting section, the second rotating shaft connecting section is butted with the second end of the rotating shaft and is fixed on the inner ring of the second bearing to rotate along with the rotating shaft, the second oil path connecting section is fixed and cannot rotate and is connected with the second cooling oil storage tank, and the second rotating shaft connecting section is connected with the second oil path connecting section through a second sleeve;
the stator core is provided with a hollow inner layer and comprises a stator oil path inlet and a stator oil path outlet, the stator oil path inlet is connected with the first cooling oil storage tank, the stator oil path outlet is connected with the second cooling oil storage tank, and cooling oil can enter the stator core from the first cooling oil storage tank and then is discharged into the second cooling oil storage tank;
the rotating shaft is provided with a rotating shaft oil path passage extending from a first end to a second end, and cooling oil can enter the rotating shaft from the first cooling oil storage tank through the first coupling sleeve and is discharged into the second cooling oil storage tank through the second coupling sleeve;
the second end of the rotating shaft is also internally provided with an oil wetting channel which is communicated with the oil passage channel of the rotating shaft and the outside of the rotating shaft, the outlet of the oil wetting channel faces the output gear, and when the rotating shaft rotates, cooling oil can be thrown out of the oil wetting channel onto the output gear;
a first oil path opening and closing device is arranged in a first oil path connecting section on the first connecting sleeve, the first oil path opening and closing device comprises a radial first limiting groove, the first limiting groove is communicated with an oil path in the first oil path connecting section, a first movable valve is arranged in the middle of the first limiting groove, a through hole is formed in the first movable valve, a first spring and a first expansion body are respectively arranged in the first limiting groove on two sides of the first movable valve, the first expansion body is elastic and filled with a gas medium, the first spring drives the first movable valve to abut against the first expansion body in an initial state, the through hole in the first movable valve is blocked by the first limiting groove, at the moment, cooling oil cannot pass through the first expansion body, and when the motor starts to work and the ambient temperature rises, the first expansion body thermally expands to drive the first movable valve to move towards the first spring, extruding the first spring, and when the temperature rises to a certain value, the volume of the first expansion body also reaches a certain value, so that the through hole in the first movable valve can be communicated with the oil way in the first oil way connecting section;
the lubricating oil channel is provided with a second oil channel opening and closing device, the second oil channel opening and closing device comprises a second limiting groove which is basically vertical to the lubricating oil channel, the second limiting groove is communicated with the lubricating oil channel, the middle position of the second limiting groove is provided with a second movable valve, a through hole is formed in the second movable valve, a second spring and a second expansion body are respectively arranged in the second limiting groove on two sides of the second movable valve, the second expansion body is elastic and filled with a gas medium, in an initial state, the second spring drives the second movable valve to abut against the first expansion body, the through hole in the second movable valve is blocked by the second limiting groove, at the moment, the cooling oil cannot pass through, when the motor starts to work, and when the temperature of the rotating shaft rises, the second expansion body thermally expands to drive the second movable valve to move towards the second spring, and extruding the second spring, wherein when the temperature rises to a certain value, the volume of the second expansion body also reaches a certain value, at the moment, the through hole in the second movable valve is communicated with the lubricating oil channel, and the rotating shaft can throw cooling oil out of the output gear through centrifugal action.
In the above-described aspect, preferably, the cooling oil contains a lubricant component therein.
In the above technical solution, preferably, an oil passage between the first cooling oil storage tank and the stator oil passage inlet of the stator core, and an oil passage between the first cooling oil storage tank and the first connection sleeve are communicated with each other through a conduit or a closed passage formed by the carrier body.
In the foregoing technical solution, preferably, an oil passage between the second cooling oil storage tank and the stator oil passage outlet of the stator core, and an oil passage between the second cooling oil storage tank and the second coupling sleeve are communicated with each other through a conduit or a closed passage formed by the carrier body.
In the above technical scheme, preferably, the first cooling oil storage tank and the second cooling oil storage tank can be communicated with each other through a conduit or a closed channel formed by the carrier body, and the first cooling oil storage tank is provided with a circulating pump which pushes cooling oil to circulate.
In the above technical solution, preferably, when the temperature around the first expansion body reaches 60 ℃ or higher, the first expansion body thermally expands to push the first movable valve to communicate with the oil passage; when the temperature around the second expansion body reaches above 85 ℃, the second expansion body expands to push the second movable valve to be communicated with the lubricating oil channel.
In the above technical solution, preferably, the flow area of the lubricating oil passage is smaller than 1/3 of the flow area of the rotating shaft oil passage, and an included angle between the outlet of the lubricating oil passage and the side surface of the output gear is 30 to 60 degrees.
In the foregoing technical solution, preferably, balls are annularly arranged in the first sleeve and the second sleeve, and the balls are respectively installed between the first sleeve and the first rotating shaft connecting section and between the second sleeve and the second rotating shaft connecting section, so that the first sleeve and the first rotating shaft connecting section can rotate and move, the second sleeve and the second rotating shaft connecting section can rotate and move, the first sleeve is in threaded connection with the first oil path connecting section, and the second sleeve is in threaded connection with the second oil path connecting section.
The utility model provides a hand-held type lithium electric tool, includes heat dissipation formula DC brushless motor in the aforesaid, do not have the louvre on hand-held type lithium electric tool's the casing, first cooling oil bin can dismantle connect in hand-held type lithium electric tool's upper portion, second cooling oil bin can dismantle connect in hand-held type lithium electric tool's lower part, first cooling oil bin with position between the second cooling oil bin can exchange.
The utility model provides a hand-held type lithium electric tool, heat dissipation formula DC brushless motor in including the aforesaid, the louvre does not have on hand-held type lithium electric tool's the casing, first cooling oil bin and second cooling oil bin are installed in the hand-held type lithium electric tool, hand-held type lithium electric tool's inside is formed with oil circuit way, oil circuit way intercommunication first cooling oil bin stator core the pivot and second cooling oil bin, be provided with the circulating pump on the first cooling oil bin, the circulating pump promotes the cooling oil circulation.
In the above technical solution, preferably, detachable covers are disposed on the first cooling oil storage tank and the second cooling oil storage tank, and cooling oil can be added into the first cooling oil storage tank and the second cooling oil storage tank through the covers.
The invention has the beneficial effects that:
1. the first oil way opening and closing device and the second oil way opening and closing device are arranged at two ends of the rotating shaft, and the opening and closing states of the oil ways can be automatically switched along with the rise of temperature, so that the automatic heat dissipation of the motor can be realized, and the motor does not need to be provided with a fan and other heat dissipation components;
2. the first oil way opening and closing device and the second oil way opening and closing device are used for controlling the opening and closing of the oil way through two elastic expansion bodies respectively, gas with the volume expansion coefficient larger than 3.5 multiplied by 10^ -3 is filled in the expansion bodies, and the expansion bodies are expanded to the set volume by setting the volume in a normal temperature state and the volume in a certain high temperature state, so that the oil way can be driven to be opened, and automatic control is realized;
3. the cooling oil contains lubricant components, and can be discharged to the gear transmission mechanism when reaching a certain temperature through the matching of the lubricating oil channel and the second oil way opening and closing device, so that the cooling effect is realized, and the lubricating effect is realized;
4. for using interior heat dissipation formula DC brushless motor's hand-held type lithium electric tool, this lithium electric tool can not set up the thermovent, has simplified inner structure, and dustproof noise reduction effect is better simultaneously.
Drawings
The invention is further illustrated with reference to the following figures and examples.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic view of the oil passage opening and closing device in an initial state.
Fig. 3 is a schematic view of a heat dissipation state of the oil passage opening and closing device of the present invention.
Fig. 4 is an enlarged schematic view at a in fig. 1 of the present invention.
Fig. 5 is a graph showing thermal expansion curves of the first expansion body and the second expansion body of the present invention.
Fig. 6 is a graph showing a relative position of a piston through hole in the first oil passage opening and closing device according to the present invention.
Fig. 7 is a graph showing a relative position of a piston through hole in the second oil passage opening and closing device according to the present invention.
In the figure, 1, a rotor, 2, a rotating shaft, 3, a rotor core, 4, a commutator, 5, a gasket, 6, a stator, 7, a stator core, 71, a hollow inner layer, 72, a stator oil path inlet, 73, a stator oil path outlet, 9, a first cooling oil storage tank, 10, a second cooling oil storage tank, 11, a first bearing, 12, a second bearing, 13, an output gear, 14, a first connecting sleeve, 141, a first rotating shaft connecting section, 142, a first oil path connecting section, 143, a first sleeve, 15, a second connecting sleeve, 151, a second rotating shaft connecting section, 152, a second oil path connecting section, 153, a second sleeve, 16, a rotating shaft oil path passage, 17, an oil wetting passage, 18, a through hole, 19, a first oil path opening and closing device, 191, a first limiting groove, 192, a first movable valve, a first spring, 194, a first expansion body, 20, a second oil path opening and closing device, 201. a second limit groove, 202, a second movable valve, 203, a second spring, 204, a second expansion body, 21 and a ball.
Detailed Description
Referring to fig. 1-7, there are shown embodiments of the present invention: an internal heat dissipation type brushless DC motor comprises a rotor 1, wherein the rotor 1 comprises a rotating shaft 2, a rotor core 3 covering the middle part of the rotating shaft 2, a commutator 4 and a gasket 5; the stator 6 is sleeved on the outer side of the rotor core 3, and the stator 6 comprises a stator core 7 and a stator winding; a first cooling oil storage tank 9, said first cooling oil storage tank 9 comprising a first oil outlet; a second cooling oil storage tank 10, said second cooling oil storage tank 10 comprising a first oil inlet; the first bearing 11 is installed at a first end part of the rotating shaft 2 (namely, the right end of the rotating shaft 2 in fig. 1), an inner ring rotates along with the rotating shaft 2, and an outer ring is fixed on a carrier; the second bearing 12 is installed at the second end part of the rotating shaft 2 (namely, the left end of the rotating shaft 2 in fig. 2), the inner ring rotates along with the rotating shaft 2, and the outer ring is fixed on the carrier; the output gear 13 is arranged at the first end of the rotating shaft 2, and the output gear 13 rotates along with the rotating shaft 2; a first coupling sleeve 14, wherein the first coupling sleeve 14 includes a first rotating shaft connecting section 141 and a first oil path connecting section 142, the first rotating shaft connecting section 141 is abutted with a first end of the rotating shaft 2 and fixed on an inner ring of the first bearing 11 to rotate along with the rotating shaft 2, the first oil path connecting section 142 is fixed to be incapable of rotating and connected with the first cooling oil storage tank 9, and the first rotating shaft connecting section 141 and the first oil path connecting section 142 are connected through a first sleeve 143; a second coupling sleeve 15, where the second coupling sleeve 15 includes a second rotating shaft connection section 151 and a second oil path connection section 152, the second rotating shaft connection section 151 is abutted to a second end of the rotating shaft 2 and fixed to an inner ring of the second bearing 12 to rotate along with the rotating shaft 2, the second oil path connection section 152 is fixed to be non-rotatable and connected to the second cooling oil storage tank 10, and the second rotating shaft connection section 151 and the second oil path connection section 152 are connected by a second sleeve 153;
the stator core 7 is provided with a hollow inner layer 71, the stator core 7 comprises a stator oil path inlet 72 and a stator oil path outlet 73, the stator oil path inlet 72 is connected with the first cooling oil storage tank, the stator oil path outlet is connected with the second cooling oil storage tank 10, and cooling oil can enter the stator core 7 from the first cooling oil storage tank 9 and then is discharged into the second cooling oil storage tank 10; the rotating shaft 2 is provided with a rotating shaft oil passage 16 extending from a first end to a second end, cooling oil can enter the rotating shaft 2 from the first cooling oil storage tank 9 through the first connecting sleeve 14 and is discharged into the second cooling oil storage tank 10 through the second connecting sleeve 15; the second end of the rotating shaft 2 is also internally provided with an oil moistening channel 17 which is communicated with the oil channel 16 of the rotating shaft and the outside of the rotating shaft 2, the outlet of the oil moistening channel 17 faces the output gear 13, and when the rotating shaft 2 rotates, cooling oil can be thrown out of the oil moistening channel 17 onto the output gear 13; a first oil path connection section 142 on the first coupling sleeve 14 is provided with a first oil path opening and closing device 19 therein, the first oil path opening and closing device 19 includes a first radial limiting groove 191, the first limiting groove 191 is communicated with an oil path in the first oil path connection section 142, a first movable valve 192 is installed at the middle position of the first limiting groove 191, a through hole 18 is formed in the first movable valve 192, a first spring 193 and a first expansion body 194 are respectively installed in the first limiting groove 191 at two sides of the first movable valve 192, the first expansion body 194 has elasticity, preferably is made of thin rubber material, and is filled with a gas medium, preferably ammonia gas, and the volume expansion coefficient of the ammonia gas is about 3.80 × 10^ -3. In an initial state, the first spring 203 drives the first movable valve 192 to abut against the first expansion body 194, the through hole 18 of the first movable valve 192 is blocked by the first limiting groove 191, at this time, cooling oil cannot pass through, when the motor starts to work and the ambient temperature rises, the first expansion body 194 thermally expands to drive the first movable valve 192 to displace towards the first spring 193, so as to press the first spring 193, and when the temperature rises to a certain value, the volume of the first expansion body 194 also reaches a certain value, at this time, the through hole 18 of the first movable valve 192 can be communicated with the oil path in the first oil path connecting section 142; the lubricating oil channel 17 is provided with a second oil channel opening and closing device 20, the second oil channel opening and closing device 20 includes a second limiting groove 201 which is substantially perpendicular to the lubricating oil channel 17, the second limiting groove 201 is communicated with the lubricating oil channel 17, a second movable valve 202 is installed in the middle of the second limiting groove 201, a through hole 18 which penetrates through the second movable valve 202 is provided on the second movable valve 202, a second spring 203 and a second expansion body 204 are respectively installed in the second limiting groove 201 on both sides of the second movable valve 202, the second expansion body 204 is the same as the first expansion body 194, has elasticity and is made of the same material, the same gas medium is filled in the second expansion body, in an initial state, the second spring 203 drives the second movable valve 202 to abut against the first expansion body 204, the through hole 18 on the second movable valve 202 is blocked by the second limiting groove 201, and cooling oil cannot pass through the second expansion body, when the motor starts to work and the temperature of the rotating shaft 2 rises, the second expansion body 204 thermally expands to drive the second movable valve 202 to displace towards the direction of the second spring 203, so as to press the second spring 203, when the temperature rises to a certain value, the volume of the second expansion body 204 also reaches a certain value, at this time, the through hole 18 on the second movable valve 202 can be communicated with the lubricating oil channel 10, and the rotating shaft 2 can throw cooling oil out to the output gear 13 through centrifugal action.
Furthermore, the cooling oil contains lubricant components, and the beneficial effects are that the cooling oil can be discharged to the gear transmission mechanism when reaching a certain temperature through the matching of the lubricating oil channel 10 and the second oil channel opening and closing device 20, so that the cooling effect is achieved, and the lubricating effect is also achieved.
As a first embodiment of the oil passage structure: the oil path between the first cooling oil storage tank 9 and the stator oil path inlet 72 of the stator core 3, and the oil path between the first cooling oil storage tank 9 and the first connecting sleeve 14 are communicated through a conduit or a closed channel formed by a carrier body; the oil path between the second cooling oil storage tank 10 and the stator oil path outlet 73 of the stator core 7, and the oil path between the second cooling oil storage tank 10 and the second coupling sleeve 15 are communicated with each other through a conduit or a closed passage formed by the carrier body. The first cooling oil storage tank 9 and the second cooling oil storage tank 10 are not communicated with each other, and the cooling oil can flow out from the first cooling oil storage tank 9 through a pressurizing device on the first cooling oil storage tank 9 or through gravity, enter the stator core 7 and the rotating shaft 2 at the same time, and then is discharged into the second cooling oil storage tank 10. When the cooling oil storage tank is used next time, the mounting positions of the first cooling oil storage tank 9 and the second cooling oil storage tank 10 which have the same shape can be exchanged for reuse.
As a second embodiment of the oil passage structure: the first cooling oil storage tank is connected with the stator 6, the rotating shaft 2 and the second cooling oil storage tank 10 and is also the same as the first oil circuit structure, the difference is that the first cooling oil storage tank 9 is communicated with the second cooling oil storage tank 10 through a guide pipe or a closed channel formed by a carrier body, a circulating pump is arranged on the first cooling oil storage tank 9, and the circulating pump pushes the cooling oil to circulate.
Further, it is set that when the temperature around the first expansion body 194 reaches 60 ℃ or higher, the first expansion body 194 thermally expands to push the first movable valve 192 to communicate with the oil passage; when the temperature around the second expansion body 204 reaches above 85 ℃, the second expansion body 204 expands to push the second movable valve 202 to communicate with the lubricating oil channel 10. The motor cooling device has the advantages that when the temperature of the working environment of the motor reaches about 60 ℃, only the oil way at the first end of the rotating shaft 2 is opened, only the heat dissipation effect of the motor is realized, the gear transmission mechanism is not required to be lubricated, and the motor cooling device is suitable for being used for a short time of the motor. When the motor is used for a long time, the working environment temperature of the motor may reach more than 85 ℃, at the moment, the lubricating oil channel 10 can be opened by pushing the second movable valve 202, lubrication and heat dissipation are provided for the gear transmission mechanism, manual addition is not needed, and the situation that the motor reaches more than 85 ℃ is often less, so the lubricating oil channel 10 is not required to be opened in each use, because the heat dissipation in the rotating shaft 2 and the stator core 7 is continuously carried out, the working environment of the motor can be quickly reduced to below 85 ℃, then under the driving force of the second spring 203, the second movable valve 202 returns to the initial position, thereby the continuous output of cooling oil can be avoided, and waste is avoided.
As another embodiment, an oil path opening and closing device identical to the first oil path opening and closing device 19 may be installed at the stator oil path inlet 72 of the stator core 7 to control the opening and closing state of the stator oil path inlet 72; or a first oil passage opening and closing device may be provided on a connection pipe between the stator core 3 and the first cooling oil storage tank 9, the first oil passage opening and closing device 19 provided at the first end of the rotary shaft 2 may be eliminated.
In order to ensure that the cooling oil in the lubricating channel 10 can be accurately thrown out to the gear transmission mechanism, further, the flow area of the lubricating channel 10 is smaller than 1/3 of the flow area of the rotating shaft oil channel 16, and the included angle between the outlet of the lubricating channel 10 and the side surface of the output gear 13 is 30-60 degrees.
In order to ensure the connection reliability between the rotating shaft 2, the oil passage opening and closing device (19 or 20) and the cooling oil storage tank (9 or 10) and ensure that the rotation of the rotating shaft 2 does not affect the installation of an external oil passage pipeline, further, balls 21 are annularly arranged in the first sleeve 143 and the second sleeve 153, the balls 21 are respectively installed between the first sleeve 143 and the first rotating shaft connecting section 141, between the second sleeve 153 and the second rotating shaft connecting section 151, so that the first sleeve 143 and the first rotating shaft connecting section 141 can be rotatably moved, the second sleeve 153 and the second rotating shaft connecting section 152 can be rotatably moved, the first sleeve 143 is in threaded connection with the first oil passage connecting section 141, and the second sleeve 153 is in threaded connection with the second oil passage connecting section 152.
A first embodiment of a hand-held lithium electric tool: including heat dissipation formula brushless DC motor in the aforesaid, do not have the louvre on hand-held type lithium electric tool's the casing, first cooling oil bin 9 can dismantle connect in hand-held type lithium electric tool's upper portion, second cooling oil bin 10 can dismantle connect in hand-held type lithium electric tool's lower part, first cooling oil bin 9 with position between the second cooling oil bin 10 can exchange.
A second embodiment of a hand-held lithium electric tool: the internal heat dissipation type brushless direct current motor comprises the internal heat dissipation type brushless direct current motor, a shell of the handheld lithium electric tool is not provided with heat dissipation holes, the first cooling oil storage tank 9 and the second cooling oil storage tank 10 are installed in the handheld lithium electric tool, an oil path channel is formed inside the handheld lithium electric tool and communicated with the first cooling oil storage tank 9, the stator core 7, the rotating shaft 2 and the second cooling oil storage tank 10, and a circulating pump is arranged on the first cooling oil storage tank 9 and pushes cooling oil to circulate; detachable covers are arranged on the first cooling oil storage tank 9 and the second cooling oil storage tank 10, and cooling oil can be added into the first cooling oil storage tank 9 and the second cooling oil storage tank 10 through the covers.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and simple modifications, equivalent changes and modifications may be made without departing from the technical scope of the present invention.
Claims (10)
1. The utility model provides an interior heat dissipation formula DC brushless motor which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the rotor comprises a rotating shaft, a rotor iron core covered in the middle of the rotating shaft, a commutator and a gasket;
the stator is sleeved on the outer side of the rotor core and comprises a stator core and a stator winding;
a first cooling oil storage tank including a first oil outlet;
a second cooling oil storage tank including a first oil inlet;
the first bearing is arranged at the end part of the first end of the rotating shaft, the inner ring rotates along with the rotating shaft, and the outer ring is fixed on the carrier;
the second bearing is arranged at the second end part of the rotating shaft, the inner ring rotates along with the rotating shaft, and the outer ring is fixed on the carrier;
the output gear is arranged at the first end of the rotating shaft and rotates along with the rotating shaft;
the first connecting sleeve comprises a first rotating shaft connecting section and a first oil path connecting section, the first rotating shaft connecting section is butted with the first end of the rotating shaft and is fixed on the inner ring of the first bearing to rotate along with the rotating shaft, the first oil path connecting section is fixed and cannot rotate and is connected with the first cooling oil storage tank, and the first rotating shaft connecting section is connected with the first oil path connecting section through a first pipe sleeve;
the second connecting sleeve comprises a second rotating shaft connecting section and a second oil path connecting section, the second rotating shaft connecting section is butted with the second end of the rotating shaft and is fixed on the inner ring of the second bearing to rotate along with the rotating shaft, the second oil path connecting section is fixed and cannot rotate and is connected with the second cooling oil storage tank, and the second rotating shaft connecting section is connected with the second oil path connecting section through a second sleeve;
the stator core is provided with a hollow inner layer and comprises a stator oil path inlet and a stator oil path outlet, the stator oil path inlet is connected with the first cooling oil storage tank, the stator oil path outlet is connected with the second cooling oil storage tank, and cooling oil can enter the stator core from the first cooling oil storage tank and then is discharged into the second cooling oil storage tank;
the rotating shaft is provided with a rotating shaft oil path passage extending from a first end to a second end, and cooling oil can enter the rotating shaft from the first cooling oil storage tank through the first coupling sleeve and is discharged into the second cooling oil storage tank through the second coupling sleeve;
the second end of the rotating shaft is also internally provided with an oil wetting channel which is communicated with the oil passage channel of the rotating shaft and the outside of the rotating shaft, the outlet of the oil wetting channel faces the output gear, and when the rotating shaft rotates, cooling oil can be thrown out of the oil wetting channel onto the output gear;
a first oil path opening and closing device is arranged in a first oil path connecting section on the first connecting sleeve, the first oil path opening and closing device comprises a radial first limiting groove, the first limiting groove is communicated with an oil path in the first oil path connecting section, a first movable valve is arranged in the middle of the first limiting groove, a through hole is formed in the first movable valve, a first spring and a first expansion body are respectively arranged in the first limiting groove on two sides of the first movable valve, the first expansion body is elastic and filled with a gas medium, the first spring drives the first movable valve to abut against the first expansion body in an initial state, the through hole in the first movable valve is blocked by the first limiting groove, at the moment, cooling oil cannot pass through the first expansion body, and when the motor starts to work and the ambient temperature rises, the first expansion body thermally expands to drive the first movable valve to move towards the first spring, extruding the first spring, and when the temperature rises to a certain value, the volume of the first expansion body also reaches a certain value, so that the through hole in the first movable valve can be communicated with the oil way in the first oil way connecting section;
the lubricating oil channel is provided with a second oil channel opening and closing device, the second oil channel opening and closing device comprises a second limiting groove which is basically vertical to the lubricating oil channel, the second limiting groove is communicated with the lubricating oil channel, the middle position of the second limiting groove is provided with a second movable valve, a through hole is formed in the second movable valve, a second spring and a second expansion body are respectively arranged in the second limiting groove on two sides of the second movable valve, the second expansion body is elastic and filled with a gas medium, in an initial state, the second spring drives the second movable valve to abut against the first expansion body, the through hole in the second movable valve is blocked by the second limiting groove, at the moment, the cooling oil cannot pass through, when the motor starts to work, and when the temperature of the rotating shaft rises, the second expansion body thermally expands to drive the second movable valve to move towards the second spring, and extruding the second spring, wherein when the temperature rises to a certain value, the volume of the second expansion body also reaches a certain value, at the moment, the through hole in the second movable valve is communicated with the lubricating oil channel, and the rotating shaft can throw cooling oil out of the output gear through centrifugal action.
2. The internal heat dissipation type dc brushless motor according to claim 1, wherein: the cooling oil contains a lubricant component therein.
3. The internal heat dissipation type dc brushless motor according to claim 1, wherein: and an oil path between the first cooling oil storage tank and the stator oil path inlet of the stator core, and an oil path between the first cooling oil storage tank and the first connecting sleeve are communicated through a guide pipe or a closed channel formed by the carrier body.
4. The internal heat dissipation type dc brushless motor according to claim 1, wherein: and an oil path between the second cooling oil storage tank and the stator oil path outlet of the stator core, and an oil path between the second cooling oil storage tank and the second connecting sleeve are communicated through a guide pipe or a closed channel formed by the carrier body.
5. The internal heat dissipation type dc brushless motor according to claim 1, wherein: the first cooling oil storage tank and the second cooling oil storage tank can be communicated through a guide pipe or a closed channel formed by the carrier body, a circulating pump is arranged on the first cooling oil storage tank, and the circulating pump pushes cooling oil to circulate.
6. The internal heat dissipation type dc brushless motor according to claim 1, wherein: when the temperature around the first expansion body reaches above 60 ℃, the first expansion body thermally expands to push the first movable valve to communicate with the oil way; when the temperature around the second expansion body reaches above 85 ℃, the second expansion body expands to push the second movable valve to be communicated with the lubricating oil channel.
7. The internal heat dissipation type dc brushless motor according to claim 1, wherein: the flow area of the lubricating oil channel is smaller than 1/3 of the flow area of the rotating shaft oil channel, and the included angle between the outlet of the lubricating oil channel and the side face of the output gear is 30-60 degrees.
8. The internal heat dissipation type dc brushless motor according to claim 1, wherein: balls are annularly arranged in the first sleeve and the second sleeve, the balls are respectively installed between the first sleeve and the first rotating shaft connecting section and between the second sleeve and the second rotating shaft connecting section, so that the first sleeve and the first rotating shaft connecting section can rotate and move, the second sleeve and the second rotating shaft connecting section can rotate and move, the first sleeve is in threaded connection with the first oil way connecting section, and the second sleeve is in threaded connection with the second oil way connecting section.
9. A hand-held type lithium electricity instrument which characterized in that: the internal heat dissipation type brushless direct current motor comprises the internal heat dissipation type brushless direct current motor defined in any one of claims 1 to 9, wherein a casing of the handheld lithium electric tool is not provided with heat dissipation holes, the first cooling oil storage tank is detachably connected to the upper portion of the handheld lithium electric tool, the second cooling oil storage tank is detachably connected to the lower portion of the handheld lithium electric tool, and positions of the first cooling oil storage tank and the second cooling oil storage tank can be interchanged.
10. A hand-held type lithium electricity instrument which characterized in that: the internal heat dissipation type brushless direct current motor comprises the internal heat dissipation type brushless direct current motor defined in any one of claims 1 to 9, no heat dissipation holes are formed in a shell of the handheld lithium electric tool, the first cooling oil storage tank and the second cooling oil storage tank are mounted in the handheld lithium electric tool, an oil passage is formed inside the handheld lithium electric tool, the oil passage is communicated with the first cooling oil storage tank, the stator core, the rotating shaft and the second cooling oil storage tank, a circulating pump is arranged on the first cooling oil storage tank, and the circulating pump pushes cooling oil to circulate.
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Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6191511B1 (en) * | 1998-09-28 | 2001-02-20 | The Swatch Group Management Services Ag | Liquid cooled asynchronous electric machine |
| JP2002034189A (en) * | 2000-07-18 | 2002-01-31 | Toyota Industries Corp | Cooling structure of motor |
| CN102754312A (en) * | 2009-10-18 | 2012-10-24 | 通用电气公司 | Thermally manageable system and electric device |
| JP2013150408A (en) * | 2012-01-18 | 2013-08-01 | Mitsubishi Heavy Ind Ltd | Rotary machine |
| CN103248150A (en) * | 2013-05-29 | 2013-08-14 | 东南大学 | Cooling system of permanent magnet generator of turbine expansion machine and work method of cooling system |
| EP2667486A2 (en) * | 2012-05-25 | 2013-11-27 | Deere & Company | Electric machine rotor cooling method |
| CN103765730A (en) * | 2011-03-09 | 2014-04-30 | 斯特里兹伯格创新公司 | Cooled magnet motor |
| CN104767325A (en) * | 2015-04-08 | 2015-07-08 | 珠海格力电器股份有限公司 | Water pump |
| CN105634210A (en) * | 2016-03-17 | 2016-06-01 | 冯亮 | Motor capable of realizing stator closed and rotor open ventilation mode by adopting axial-flow ventilation |
| US20170237318A1 (en) * | 2014-08-07 | 2017-08-17 | Siemens Aktiengesellschaft | Device And Method For Cooling An Energy Conversion Apparatus Having A Rotor And At Least One Turbine |
| CN109274216A (en) * | 2016-03-15 | 2019-01-25 | 高建鑫 | A kind of motor |
| CN109361292A (en) * | 2018-11-02 | 2019-02-19 | 南京林业大学 | A kind of full-liquid type evaporative cooling system cooling for motor |
-
2020
- 2020-06-22 CN CN202010573926.5A patent/CN111654135B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6191511B1 (en) * | 1998-09-28 | 2001-02-20 | The Swatch Group Management Services Ag | Liquid cooled asynchronous electric machine |
| JP2002034189A (en) * | 2000-07-18 | 2002-01-31 | Toyota Industries Corp | Cooling structure of motor |
| CN102754312A (en) * | 2009-10-18 | 2012-10-24 | 通用电气公司 | Thermally manageable system and electric device |
| CN103765730A (en) * | 2011-03-09 | 2014-04-30 | 斯特里兹伯格创新公司 | Cooled magnet motor |
| JP2013150408A (en) * | 2012-01-18 | 2013-08-01 | Mitsubishi Heavy Ind Ltd | Rotary machine |
| EP2667486A2 (en) * | 2012-05-25 | 2013-11-27 | Deere & Company | Electric machine rotor cooling method |
| CN103248150A (en) * | 2013-05-29 | 2013-08-14 | 东南大学 | Cooling system of permanent magnet generator of turbine expansion machine and work method of cooling system |
| US20170237318A1 (en) * | 2014-08-07 | 2017-08-17 | Siemens Aktiengesellschaft | Device And Method For Cooling An Energy Conversion Apparatus Having A Rotor And At Least One Turbine |
| CN104767325A (en) * | 2015-04-08 | 2015-07-08 | 珠海格力电器股份有限公司 | Water pump |
| CN109274216A (en) * | 2016-03-15 | 2019-01-25 | 高建鑫 | A kind of motor |
| CN105634210A (en) * | 2016-03-17 | 2016-06-01 | 冯亮 | Motor capable of realizing stator closed and rotor open ventilation mode by adopting axial-flow ventilation |
| CN109361292A (en) * | 2018-11-02 | 2019-02-19 | 南京林业大学 | A kind of full-liquid type evaporative cooling system cooling for motor |
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|---|---|
| CN111654135B (en) | 2022-03-11 |
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Denomination of invention: A DC brushless motor with internal heat dissipation and a handheld lithium battery tool Effective date of registration: 20230718 Granted publication date: 20220311 Pledgee: Yongkang Branch of China Construction Bank Co.,Ltd. Pledgor: ZHEJIANG MINLI POWER TOOLS CO.,LTD. Registration number: Y2023980048803 |