CN106392836A - Electric tool - Google Patents
Electric tool Download PDFInfo
- Publication number
- CN106392836A CN106392836A CN201510490239.6A CN201510490239A CN106392836A CN 106392836 A CN106392836 A CN 106392836A CN 201510490239 A CN201510490239 A CN 201510490239A CN 106392836 A CN106392836 A CN 106392836A
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- CN
- China
- Prior art keywords
- motor
- radiating airflow
- tool housing
- radiating
- fan
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
- B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
- B25F5/008—Cooling means
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
- B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
Abstract
The invention discloses an electric tool. The electric tool comprises a motor, a tool shell and a fan. The motor comprises a motor shaft capable of rotating with the motor axis as the axis. The tool shell contains the motor. When the fan rotates, heat dissipation airflow can be generated in the tool shell. The motor further comprises a motor shell and a stator arranged in the motor shell. The motor shell comprises a side wall, a top wall and a bottom wall. The side wall at least can partly surround the motor shaft. The top wall is located at the end, parallel to the motor axis direction of the motor shaft, of the side wall, and the bottom wall is located at the other end, parallel to the motor axis direction of the motor shaft, of the side wall. At least two guiding ribs are further formed by the top wall and can guide the heat dissipation airflow in a diffusion manner, wherein the heat dissipation airflow is generated in the tool shell when the fan rotates. The electric tool is good in heat dissipation effect.
Description
Technical field
The present invention relates to a kind of electric tool.
Background technology
Electric tool generally includes：Motor, tool housing and the functor that can be motor driven.But the radiating effect in existing electric tool is poor, life-time service is likely to result in the damage of the other parts in motor and tool housing.
Sander, as a kind of electric tool of conventional sanding and polishing class, is increasingly favored by people.In structure, sander mainly includes：Housing, motor, actuating device and base plate, wherein actuator drives base plate rotate or swing.According to the shape of base plate, sander generally comprises flat sanding machine, circular sander and triangle sander.
But, existing sander since it is desired that larger output, thus a high-power larger-size motor would generally be provided with, the volume of whole sander so will certainly be caused larger, whole machine is heavier, be unfavorable for using and carrying of user.Furthermore, the shell structure of existing sander can not make sander reach the most efficient radiating effect；And would generally be in the fan of motor internal setting heat transmission, this fan can cause dust or steam etc. to enter the problem of motor internal, consequently, it is possible to damaging motor, or even has danger to user.
Content of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of electric tool that can improve radiating effect.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that：
A kind of electric tool, including：
Motor, including the motor shaft that can be rotated with electrical axis for axle；
Tool housing, can accommodate motor；
Fan, can produce radiating airflow in tool housing when it rotates；
Control board, is contained in tool housing；
Tool housing is formed with：
Radiating airflow entrance, at least can allow in radiating airflow entering tool housing；
Radiating airflow exports, and radiating airflow at least can be allowed to flow out tool housing；
When fan rotates, the radiating airflow from radiating airflow entrance entering tool housing at least can flow through control board and motor.
Further, control board is arranged between radiating airflow entrance and motor.
Further, when fan rotates, the radiating airflow from radiating airflow entrance entering tool housing passes through motor after flowing through control board.
Further, when position on tool housing for the radiating airflow outlet is rotated with fan, the direction of guiding radiating airflow blowout is corresponding.
Further, tool housing includes：
Handle portion；
Receiving portion, forms the accommodating chamber accommodating motor；
Fan is arranged in accommodating chamber, and radiating airflow entrance is arranged at handle portion, and radiating airflow outlet is arranged at receiving portion position corresponding with fan.
Further, handle portion is formed with the gripping area being suitable to user's gripping, and gripping area is arranged between radiating airflow entrance and receiving portion.
Further, tool housing has a symmetrical plane parallel to the electrical axis of motor shaft, and radiating airflow entrance is symmetrical with regard to symmetrical plane.
Further, tool housing includes：
Handle portion, the direction along the electrical axis perpendicular to motor shaft extends；
Handle portion is also associated with the Operation switch for starting motor；On the bearing of trend along handle portion, control board is at least partially arranged between Operation switch and radiating airflow entrance.
Further, fan is arranged at outside electric machine casing；Fan includes：Fanning tray and flabellum, the card of fanning tray is installed on the side near motor for the fanning tray perpendicular to the electrical axis of motor shaft, flabellum；When fan rotates, the radiating airflow producing in flabellum energy steering tool housing blows to radiating airflow outlet.
Further, electric tool is sander, and sander also includes：
Base plate, is arranged at outside tool housing；
Fan is arranged between motor and base plate.
The invention has benefit that：Control board and motor are respectively positioned in the heat dissipation path of radiating airflow such that it is able to simultaneously to control board and motor radiating, improve radiating effect.
Brief description
Fig. 1 is the overall structure diagram of the electric tool of one embodiment of the invention；
Fig. 2 is the overall structure diagram in another orientation of electric tool in Fig. 1；
Fig. 3 is the overall structure diagram in the another orientation of electric tool in Fig. 1；
Fig. 4 is that the electric tool in Fig. 1 removes the internal view after tool housing；
Fig. 5 is the schematic cross-section of the motor in Fig. 4；
Fig. 6 is the explosive view of the motor in Fig. 4；
Fig. 7 is the enlarged diagram of the electric machine casing in Fig. 6；
Fig. 8 is the exploded view of the electric machine casing in Fig. 6.
Specific embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is made with specific introduction.
The present invention proposes a kind of new electric tool, and as an embodiment, this electric tool can be sander, and this sander small volume and less weight is easy to carry, and its good heat dissipation effect.Fig. 1 to Fig. 3 is the overall structure diagram of the electric tool different azimuth of one embodiment of the invention.
Fig. 4 is that the electric tool in Fig. 1 removes the internal view after tool housing；Fig. 5 is the schematic cross-section of the motor in Fig. 4.Please with reference to Fig. 1 to Fig. 5, sander 100 at least includes：Tool housing 10, motor 20 and base plate 30, of course for realizing the transmission to base plate 30 for the motor 20, are additionally provided with transmission component 40 between motor 20 and base plate 30.
Tool housing 10 is used for forming the shell of whole sander 100, is internally formed the receiving space accommodating motor 20.Motor 20 is used for converting electrical energy into the power that can be transferred to base plate 30, and motor 20 includes：Motor shaft 21, stator（Figure is not marked）And electric machine casing 22, motor shaft 21 can be with electrical axis Y for axle rotation, and electric machine casing 22 forms the shell of motor 20, and stator is contained in electric machine casing 22, and the two ends of motor shaft 21 pass electric machine casing 22.Transmission component 40 is used for for the power of motor 20 being transferred to base plate 30, drives base plate 30 to move.Base plate 30 is located at outside tool housing 10, and the adnexaes such as sand paper can be installed or be clamped to base plate 30, and base plate 30 also has a rotation axis X parallel to the electrical axis Y of motor shaft 21.Under the driving of transmission component 40, base plate 30 can either revolve round the sun around electrical axis Y, simultaneously can also be around the rotation axis X rotation of its own, thus realizing the function of polishing, polishing etc..Wherein, rotation axis X and the electrical axis Y of motor shaft 21 are parallel to each other, and are spaced a distance between the two.
Here, the motion mode of base plate 30 is described further：For flat sander, in order to realize its function, the support limiting base plate 30 rotation can be provided with base plate 30, in the presence of this support, base plate 30 is only capable of rotation in a relatively small or even negligible predetermined angle with its rotation axis X for axle, in this case, base plate 30 can opposite tool housing 10 beat；And for circular sander, polish fine degree to increase it, without arranging support on base plate 30, now base plate 30 can not only be revolved round the sun with electrical axis Y for axle, and base plate 30 can be circled with its rotation axis X certainly for axle.And the angle of its rotation can be not intended to limit around its rotation axis X rotation for described base plate 30 in the present invention, in other words both can certainly circle can also only rotation in the range of predetermined angle for base plate 30, thus the sander 100 of the present invention covers flat sander and circular sander, certainly it is not restricted to this, it will be appreciated by those skilled in the art that, the shape of base plate 30 arbitrarily can be arranged.
The electrical axis Y of motor shaft 21 and the distance between the rotation axis X of base plate 30 d1 is more than or equal to 1 with electric machine casing 22 along the ratio of size d2 in the electrical axis Y-direction of motor shaft 21：32, further, size d2 of electric machine casing 22 is more than or equal to 40mm and is less than or equal to 50mm.Thus, motor 20 meet efficient drive base plate 30 under conditions of, the longitudinal size design of electric machine casing 22 relatively small, so as to reduce the longitudinal size of whole sander 100, and then making sander 100 small volume and less weight, feel preferably, and facilitates user to carry and operates.
Further, so that the complete machine structure of sander 100 reduces further, by to the setting of tool housing 10 and arranging additionally it is possible to make electrical axis Y and the ratio of the distance between rotation axis X d1 and tool housing 10 size d3 along the electrical axis Y-direction of motor shaft 21 be more than or equal to 1 of internal each part：65, and electrical axis Y is also greater than equal to 1 with the ratio of the distance between rotation axis X d1 and sander 100 size d4 along electrical axis Y-direction：75, further, size d3 of tool housing 10 is more than or equal to 70mm and is less than or equal to 95mm, and size d4 of sander 100 is more than or equal to 90mm and is less than or equal to 110mm.As a specific embodiment, for example, as electrical axis Y and the distance between rotation axis X about 2.5mm, the height of electric machine casing 22 is about 48mm, the height of tool housing 10 is about 82mm, and the height of sander 100 complete machine structure is about 98mm, in this specific embodiment, the longitudinal size of sander 100 is only as half hand size of being grown up, thus this sander 100 is very compact, and under idle state, user almost can grip any one position of sander 100, facilitate user to carry and operate.In addition, the longitudinal size of this sander 100 is less reduces the distance between the center of gravity of sander 100 and the handss of user additionally it is possible to reduce the height of the center of gravity of sander 100 when user grips sander 100, thus improving the stability of gripping, improve security performance.
It should be noted that electric machine casing 22 refers to electric machine casing 22 in electrical axis Y-direction and parallel to the full-size on the direction of electrical axis Y along size d2 of the electrical axis Y of motor shaft 21；Same, sander 100 refers to whole sander 100 in electrical axis Y-direction and parallel to the full-size on the direction of electrical axis Y along size d4 of electrical axis Y, and tool housing 10 refers to whole tool housing 10 in electrical axis Y and parallel to the full-size on the direction of electrical axis Y along size d3 of electrical axis Y.
In addition, for the radiating effect and the control to motor 20 that improve sander 100, sander 100 also includes：Fan 50 and control board 60.Fan 50 is located in tool housing 10, and it can rotate in the lump with motor shaft 21, and can produce the radiating airflow for cooling down sander 100 in tool housing 10 when rotating.Control board 60 is contained in tool housing 10, and it at least can be used for the circuit between controlled motor 20 and power supply, thus realize the start and stop to motor 20 and rotating speed etc. being controlled.Tool housing 10 is formed with radiating airflow entrance 111 and radiating airflow outlet 121, radiating airflow entrance 111 can allow radiating airflow from the outer entering tool housing 10 of tool housing 10, and radiating airflow outlet 121 can allow radiating airflow to flow out to tool housing 10 inside tool housing 10.When fan 50 rotates, radiating airflow from radiating airflow entrance 111 entering tool housing 10 at least can flow through control board 60 and electric machine casing 22, thus control board 60 and electric machine casing 22 are respectively positioned on the flow path of radiating airflow, and then, this fan 50 can also can not only radiate to control board 60 to motor 20 radiating simultaneously, improves radiating effect.
In order to realize above technical scheme, as concrete scheme, in the present embodiment, tool housing 10 has a symmetrical plane S, and, parallel to the electrical axis Y of motor shaft 21, tool housing 10 is symmetrical with regard to this symmetrical plane S for this symmetrical plane S.Tool housing 10 generally includes：Handle portion 11 and receiving portion 12.Handle portion 11 is used for gripping for user, and receiving portion 12 forms the accommodating chamber accommodating motor 20 and fan 50.Wherein, handle portion 11 is symmetrical with regard to this symmetrical plane S, and receiving portion 12 is also symmetrical with regard to this symmetrical plane S, in such manner, it is possible to improve user further to grip stability during sander 100.It should be noted that, the left and right sides that the tool housing 10 of indication of the present invention is symmetrically not strictly limited in symmetrical plane S with regard to this symmetrical plane S is completely the same, as long as but all to can be understood as tool housing 10 symmetrical with regard to this symmetrical plane S within the scope of error allows.In other words, even if tool housing 10 is when the side of symmetrical plane S is formed with an opening or is provided with these little structures on symmetry impact such as switch, we still think this tool housing 10 be have symmetric.
Handle portion 11 extends approximately along the electrical axis Y-direction of the motor shaft 21 in receiving portion 12, and on the bearing of trend of handle portion 11, handle portion 11 one end connects power line, the other end is connected with receiving portion 12 so that tool housing 10 substantially presents the structure of a L-type.In the present embodiment, sander 100 preferably adopts the power supply mode of AC-powered, so can not only mitigate the overall weight of sander 100, but also can improve and use duration.
It is also formed with receiving space, control board 60 is located in this receiving space, and bearing of trend in receiving space for the control board 60 is parallel with the bearing of trend of handle portion 11 in handle portion 11.Control board 60 and motor 20 can be simultaneously flowed through to realize radiating airflow, radiating airflow entrance 111 is arranged at handle portion 11, control board 60 is located between radiating airflow entrance 111 and motor 20.So, when fan 50 rotates, radiating airflow from radiating airflow entrance 111 entering tool housing 10 first flows through control board 60 and then passes through motor 20, that is to say that control board 60 is arranged at radiating airflow and flow to the flow path of motor 20 from radiating airflow entrance 111.
The also symmetrical plane S with regard to tool housing 10 is symmetrical for radiating airflow entrance 111, thus radiating airflow can uniformly flow through control board 60 from both sides, improves the uniformity of control board 60 radiating.In the present embodiment, handle portion 11 is formed with a gripping area 112 being applied to user's gripping, structure in this gripping area 112 can be mated most with the hand-type of user, it is important that, this gripping area 112 is located between radiating airflow entrance 111 and receiving portion 12, in other words, radiating airflow entrance 111 with respect to gripping area 112 further from receiving portion 12, and this radiating airflow entrance 111 the position on handle portion 11 with gripping area 112 position on handle portion 11 do not have overlapping.Thus it is possible, on the one hand, making the position corresponding with gripping area 112 of the flow path of the radiating airflow receiving space through handle portion 11 such that it is able to so that user's hand when gripping sander 100 feels nice and cool, improve comfort level；On the other hand additionally it is possible to be prevented effectively from user when gripping sander 100, the handss of user cover radiating airflow entrance 111, affect radiating effect；Furthermore, closer to receiving portion 12 so that user is when gripping sander 100, in sander 100 transversely, the handss of user, closer to the position of centre of gravity of sander 100, improve the lateral stability of sander 100 to gripping area 112 radiating airflow entrance 111 relatively.
In addition, handle portion 11 is also associated with the Operation switch 113 for starting motor 20, this Operation switch 113 position on handle portion 11 enables to thumb when handss are positioned over gripping area 112 by user and just can touch.Further, on the bearing of trend of handle portion 11, control board 60 is also located between Operation switch 113 and radiating airflow entrance 111.
Radiating airflow outlet 121 is arranged at receiving portion 12, and radiating airflow outlet 121 positions in receiving portion 12 are corresponding with fan 50, so, radiating airflow can directly be blown out by fan 50 by radiating airflow outlet 121, thus improving radiating effect, but also dust-proof effect can be played.
Fig. 6 is the explosive view of the motor in Fig. 4, refer to shown in Fig. 4 to Fig. 6, and motor 20, except including foregoing motor shaft 21, stator and electric machine casing 22, also includes rotor core 23, and stator also includes：Stator core 24 and stator coil 25.Rotor core 23 constitutes synchronous axial system with motor shaft 21, and stator core 24 is formed with centre bore, and rotor core 23 is located at this center in the hole, and stator coil 25 is wound in stator core 24.In other words, in the present embodiment, this motor 20 preferably employs inner rotor motor such that it is able to improve the rotating speed of the base plate 30 of sander 100, and then improves the precision of grinding and buffing.Further, this motor 20 is preferably inner-rotor brushless motor, in the case of non-carbonate, can further reduce the axial dimension of motor 20.
Preferably, motor 20 is fractional-slot winding motor, and more specifically, the number of phases of this motor 20 is 3, and slot number is 12, and number of poles is 8, and MgO-ZrO_2 brick is 1/2.Be conducive to improving the copper factor of motor 20 additionally it is possible to shorten coil girth and winding overhang extension elongation using fractional-slot winding, lower copper consumption, furthermore the sine of back emf waveform can also be improved.
Preferably, on the basis realizing motor 20 basis insulation, also further it is provided with an insulating sleeve（Not shown）Realize the superinsulation of motor 20, this insulating sleeve is arranged around motor shaft 21, it is achieved thereby that the double insulation of motor 20.
Introduce the structure of electric machine casing 22 in detail below：
Fig. 7 is the enlarged diagram of the electric machine casing in Fig. 6；Fig. 8 is the exploded view of the electric machine casing in Fig. 6.Please with reference to shown in Fig. 5 to Fig. 8, in the present embodiment, electric machine casing 22 only allows motor shaft 21 to pass through, electric machine casing 22 forms the structure of substantially sealing, so that radiating airflow can not be entered in electric machine casing 22, in other words, this motor 20 is enclosed motor.In such manner, it is possible to effectively prevent dust or steam from entering in electric machine casing 22；Importantly, radiating airflow can not enter the inside of electric machine casing 22, thus avoiding dust in radiating airflow etc. to enter in electric machine casing 22, the life-span of impact electric machine casing 22.Need exist for the closure of electric machine casing 22 is described further, the electric machine casing 22 of closure is not to say that electric machine casing 22 is completely enclosed structure, but allow to be formed on electric machine casing 22 for example can be so that the axis hole that passes through of motor shaft 21.
And for enclosed motor 20, we are necessary to propose a kind of radiator structure of the motor 20 different from prior art, this radiator structure is not restricted to enclosed motor certainly.Specifically, electric machine casing 22 includes：Side wall 221, roof 222 and diapire 223.Side wall 221 substantially presents a hollow circular cylinder structure around motor shaft 21, and roof 222 and diapire 223 are located at side wall 221 respectively along the two ends on the direction parallel to electrical axis Y.The two ends of motor shaft 21 can be each passed through roof 222 and diapire 223.
Along in electrical axis Y-direction, roof 222 opposing bottom wall 223 is closer to handle portion 11.Further, roof 222 is substantially located in the same horizontal plane perpendicular to electrical axis Y with the receiving space in handle portion 11, so, the radiating airflow blowing to the accommodating chamber of receiving portion 12 from the receiving space of handle portion 11 can just flow through the roof 222 of electric machine casing 22.
In order to realize the radiating of motor 20, at least two guiding ribs 2221 are also formed with roof 222, the plurality of guiding rib 2221 can guide radiating airflow in the way of spreading.So, enable to blow to the radiating airflow of roof 222 in handle portion 11 and be roughly parallel to, by one, the direction that handle portion 11 extends and diffuse to the peripheral direction generally about electric machine casing 22, so as to relatively uniform, electric machine casing 22 is radiated, improve radiating effect.
Guiding rib 2221 extends along perpendicular to the direction of electrical axis Y, and guiding rib 2221 has the air-flow upstream end 2221a being oppositely arranged and air-flow outflow end 2221b in their extension direction, wherein air-flow upstream end 2221a relative wind outflow end 2221b is closer to handle portion 11, so, when fan 50 rotates, the radiating airflow producing in tool housing 10 can first flow through air-flow upstream end 2221a, then pass through air-flow outflow end 2221b, that is to say, radiating airflow flows through the space between adjacent two guiding rib 2221 by air-flow upstream end 2221a, then pass through air-flow outflow end 2221b to flow out.Radiating airflow can be guided to realize guiding rib 2221 in the way of spreading, along the direction pointing to air-flow outflow end 2221b from air-flow upstream end 2221a, the distance between two adjacent guiding ribs 2221 are gradually increased.
In addition, the guiding rib 2221 also symmetrical plane S with regard to tool housing 10 is symmetrical, so can further improve the uniformity of radiating.It is furthermore preferred that being less than apart from the angle between symmetrical plane S guiding rib 2221 farther out and symmetrical plane S apart from the angle between the nearer guiding rib of symmetrical plane S 2221 and symmetrical plane S.The centerline axis parallel of the hollow circular cylinder structure that side wall 221 is formed is in electrical axis Y, thus the bearing of trend of side wall 221 is also parallel with electrical axis Y.The periphery of side wall 221 is also formed with multiple radiating ribs 2211, and radiating ribs 2211 are used for by by the heat transfer on electric machine casing 22 surface to radiating airflow, thus reaching the effect that whole motor 20 is radiated.Radiating ribs 2211 can guide radiating airflow and flow through electric machine casing 22 along the direction of the electrical axis Y parallel to motor shaft 21.When radiating airflow flows through electric machine casing 22, the heat running and storing because of motor 20 can be absorbed on electric machine casing 22, so as to constantly radiate to motor 20, and radiating airflow can be blown to outside tool housing 10 by instant in the presence of fan 50, so as to instant, heat is distributed, it is to avoid the accumulation of heat.
Radiating ribs 2211 include two classes, respectively：First kind radiating ribs 2211a and Equations of The Second Kind radiating ribs 2211b.Multiple first kind radiating ribs 2211a are arranged in order in the periphery of side wall 221, and multiple Equations of The Second Kind radiating ribs 2211b are also arranged in order in the periphery of side wall 221.In side wall 221 along along the direction parallel to electrical axis Y, first kind radiating ribs 2211a are distributed in the both sides of Equations of The Second Kind radiating ribs 2211b, in other words the approximately mid way between in side wall 221 arranges Equations of The Second Kind radiating ribs 2211b, and arranges first kind radiating ribs 2211a at the two ends of side wall 221.In other words, when radiating airflow flows through electric machine casing 22, radiating airflow can first flow through the region between adjacent two first kind radiating ribs 2211a of side wall 221 one end, then flow through the region between adjacent two Equations of The Second Kind radiating ribs 2211b, finally pass through the region between adjacent two first kind radiating ribs 2211a of side wall 221 other end.
Wherein, we also set, and the flow velocity that radiating airflow flows through during the region between adjacent two first kind radiating ribs 2211a flows through the flow velocity during region between adjacent two Equations of The Second Kind radiating ribs 2211b less than this radiating airflow.In order to realize the difference of flow velocity, the distance between two adjacent first kind radiating ribs 2211a are more than the distance between two adjacent Equations of The Second Kind radiating ribs 2211b, that is to say that the density of first kind radiating ribs 2211a on side wall 221 is less than the density of Equations of The Second Kind radiating ribs 2211b.Further, when first kind radiating ribs 2211a are evenly distributed in the circumference of side wall 221, and Equations of The Second Kind radiating ribs 2211b also evenly distributed in the circumference of side wall 221 when, then the number of first kind radiating ribs 2211a on a circumferencial direction of side wall 221 is less than the number of Equations of The Second Kind radiating ribs 2211b of a circumferencial direction in side wall 221.So, on the one hand, because flow velocity when radiating airflow flows through at Equations of The Second Kind radiating ribs 2211b is more than the flow velocity flowing through during first kind radiating ribs 2211a, thus radiating airflow can quickly take away the heat on electric machine casing 22 at Equations of The Second Kind radiating ribs 2211b, improve radiating effect；On the other hand, the density of Equations of The Second Kind radiating ribs 2211b big such that it is able to increase the contact area of electric machine casing 22 and radiating airflow, and then improve radiating effect；In addition, it is understood that, because the upper and lower ends of side wall 221 are respectively close to roof 222 and diapire 223, the heat of the therefore upper and lower ends of side wall 221 will be less than the heat of side wall 221 approximate mid-section position relatively, in consideration of it, being also necessary Equations of The Second Kind radiating ribs 2211b are arranged between first kind radiating ribs 2211a
Preferably, the number of Equations of The Second Kind radiating ribs 2211b on a circumferencial direction of side wall 221 is more than or equal to 1 and less than or equal to 5 such that it is able to the density limiting Equations of The Second Kind radiating ribs 2211b is overstocked with the ratio of the number of first kind radiating ribs 2211a of a circumferencial direction in side wall 221.Because when Equations of The Second Kind radiating ribs 2211b are overstocked, the distance between two adjacent Equations of The Second Kind radiating ribs 2211b are too small, so, when radiating airflow flows through the region between Equations of The Second Kind radiating ribs 2211b, flow velocity is too fast, heat on electric machine casing 22 does not also have enough time to be transferred to radiating airflow, radiating airflow just outflow motor housing 22, is undoubtedly reduction of radiating effect.
Preferably, in the electrical axis Y along motor shaft 21 radially（Radially refer to perpendicular to electrical axis Y and point to the direction of electrical axis Y）The distance between inner side of the outside of electric machine casing 22 and tool housing 10 is more than or equal to 0.5mm, further, along electrical axis Y radially, the size that radiating ribs 2211 protrude from electric machine casing 22 is more than or equal to 0.5mm, so ensure that there is sufficiently large radiating airflow passage.It should be noted that, here between electric machine casing 22 and tool housing 10, there is a certain distance, its object is to improve radiating effect, therefore this distance is not restricted to be formed the distance between most of region of side wall 221 that some do not affect individually electric machine casing 22 and tool housing 10 on electric machine casing 22.
In addition, for the ease of forming the electric machine casing 22 with radiating ribs 2211, electric machine casing 22 includes motor upper shell 224, housing 225 and motor lower house 226 in motor；Side wall 221 is then made up of three parts, is respectively：Form the sidewall upper of first kind radiating ribs 2211a（Figure is not marked）, formed Equations of The Second Kind radiating ribs 2211b side wall in the middle part of（Figure is not marked）And form the side wall lower ends of first kind radiating ribs 2211a（Figure is not marked）, wherein, sidewall upper and side wall lower ends are located at the both sides in the middle part of the wall of side respectively.So, motor upper shell 224 includes roof 222 and sidewall upper, and in motor, housing 225 includes in the middle part of the wall of side, and motor lower house 226 includes diapire 223 and side wall lower ends.Wherein, because the guiding rib 2221 on motor upper shell 224 and the negligible amounts of first kind radiating ribs 2211a, and the quantity of Equations of The Second Kind radiating ribs 2211b on housing 225 in motor is more, the negligible amounts of first kind radiating ribs 2211a on motor lower house 226, thus motor upper shell 224 and motor lower house 226 can use same technological forming, and housing 225 can use another technological forming in motor, manufacturing cost so can be saved.
Fan 50 is arranged between motor 20 and base plate 30, and it is contained in the accommodating chamber of receiving portion 12.Fan 50 is also provided at outside electric machine casing 22, and it can rotate with the rotation of motor shaft 21 when motor 20 starts.So that radiating airflow can be directly blown to outside tool housing 10 by fan 50, the direction that radiating airflow exports guiding radiating airflow blowout when 121 positions on tool housing 10 are rotated with fan 50 is corresponding.
Specifically, fan 50 at least includes fanning tray 51 and flabellum 52, and fanning tray 51 constitutes synchronous axial system with motor shaft 21.Fanning tray 51 substantially becomes cirque structure, and the card of fanning tray 51 is approximately perpendicular to electrical axis Y, and flabellum 52 is installed on the side of the close motor 20 of fanning tray 51.Flabellum 52 includes multiple, and flabellum 52 radially extends approximately along electrical axis Y's, the distance between two adjacent flabellums 52 be radially gradually increased from inside to outside such that it is able to guide radiating airflow blow to its just to radiating airflow outlet 121.Certainly, in order to adapt to the structure of each part within tool housing 10, flabellum 52 can have different air-flows and suck edge 521.Radiating airflow outlet 121 is also about fan 50 and arranges, so being capable of uniformly air-out.
In the present embodiment, control board 60 is arranged in handle portion 11, certainly in other embodiments, control board 60 can also be located in receiving portion 12 or be located at the junction of handle portion 11 and receiving portion 12, as long as control board 60 and electric machine casing 22 are respectively positioned on the flow path of radiating airflow, preferable radiating effect can be reached.
In addition, sander 100 can also connect dust exhaust apparatus, in order to connect this dust exhaust apparatus, it is formed with dust collecting part 13 on the tool housing 10 of sander 100, this dust collecting part 13 is extended from handle portion 11 and is connected with receiving portion 12, dust collecting part 13 is also mutually communicated with receiving portion 12, and the region of dust collecting part 13 and receiving portion 12 insertion is located between radiating airflow outlet 121 and base plate 30 such that it is able to realize the dust that automatic absorption sander 100 produces in running.Further, in the present embodiment, handle portion 11 and receiving portion 12 substantially assume the structure of L-type, and in order to reduce the overall dimensions of sander 100, dust collecting part 13 is located at the inside of L-type structure, and dust collecting part 13 extending out from L-type.
It should be noted that, apparent its of the radiator structure of the structure with regard to motor 20 in this embodiment and tool housing 10 is not rely on sander 100, motor 20 therefore in the present embodiment and tool housing 10 are applicable not only to sander 100, can be applicable to the electric tools such as angle mill, electric drill, specifically repeat no more.
The basic principles, principal features and advantages of the present invention have been shown and described above.It should be understood by those skilled in the art that, the invention is not limited in any way for above-described embodiment, all technical schemes being obtained by the way of equivalent or equivalent transformation, all falls within protection scope of the present invention.
Claims (10)
1. a kind of electric tool, including：
Motor, including the motor shaft that can be rotated with electrical axis for axle；
Tool housing, can accommodate described motor；
Fan, can produce radiating airflow in described tool housing when it rotates；
Control board, is contained in described tool housing；
Described tool housing is formed with：
Radiating airflow entrance, at least can allow radiating airflow to enter in described tool housing；
Radiating airflow exports, and radiating airflow at least can be allowed to flow out described tool housing；
When described fan rotates, enter the radiating airflow in described tool housing from described radiating airflow entrance and at least can flow through described control board and described motor.
2. electric tool according to claim 1 it is characterised in that
Described control board is arranged between described radiating airflow entrance and described motor.
3. electric tool according to claim 1 it is characterised in that
When described fan rotates, enter the radiating airflow in described tool housing from described radiating airflow entrance and pass through described motor after flowing through described control board.
4. electric tool according to claim 1 it is characterised in that
When position on described tool housing for the described radiating airflow outlet is rotated with described fan, the direction of guiding radiating airflow blowout is corresponding.
5. electric tool according to claim 1 it is characterised in that
Described tool housing includes：
Handle portion；
Receiving portion, forms the accommodating chamber accommodating described motor；
Described fan is arranged in described accommodating chamber, and described radiating airflow entrance is arranged at described handle portion, and described radiating airflow outlet is arranged at described accommodation section position corresponding with described fan.
6. electric tool according to claim 5 it is characterised in that
Described handle portion is formed with the gripping area being suitable to user's gripping, and described gripping area is arranged between described radiating airflow entrance and described accommodation section.
7. electric tool according to claim 1 it is characterised in that
Described tool housing has the symmetrical plane of the electrical axis parallel to described motor shaft, and described radiating airflow entrance is symmetrical with regard to described symmetrical plane.
8. electric tool according to claim 1 it is characterised in that
Described tool housing includes：
Handle portion, the direction along the electrical axis perpendicular to described motor shaft extends；
Described handle portion is also associated with the Operation switch for starting described motor；On the bearing of trend along described handle portion, described control board is at least partially arranged between described Operation switch and described radiating airflow entrance.
9. electric tool according to claim 1 it is characterised in that
Described fan is arranged at outside described electric machine casing；
Described fan includes：Fanning tray and flabellum, the card of described fanning tray is installed on the side near described motor for the described fanning tray perpendicular to the electrical axis of described motor shaft, described flabellum；When described fan rotates, described flabellum can guide the radiating airflow producing in described tool housing and blow to described radiating airflow outlet.
10. the electric tool according to claim 1 to 9 any one it is characterised in that
Described electric tool is sander, and described sander also includes：
Base plate, is arranged at outside described tool housing；
Described fan is arranged between described motor and described base plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510460234 | 2015-07-30 | ||
| CN2015104602349 | 2015-07-30 |
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| Publication Number | Publication Date |
|---|---|
| CN106392836A true CN106392836A (en) | 2017-02-15 |
| CN106392836B CN106392836B (en) | 2020-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510490239.6A Active CN106392836B (en) | 2015-07-30 | 2015-08-11 | Electric tool |
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| Country | Link |
|---|---|
| CN (1) | CN106392836B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110653699A (en) * | 2018-06-29 | 2020-01-07 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| WO2020173487A1 (en) * | 2019-02-27 | 2020-09-03 | 南京德朔实业有限公司 | Long pole power tool |
| CN112706043A (en) * | 2019-10-25 | 2021-04-27 | 南京德朔实业有限公司 | Electric tool |
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| CN202498447U (en) * | 2012-03-21 | 2012-10-24 | 林健明 | Dust suction device of dust-suction type sander |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110653699A (en) * | 2018-06-29 | 2020-01-07 | 南京德朔实业有限公司 | Angle grinder and electric tool |
| CN110653699B (en) * | 2018-06-29 | 2022-08-05 | 南京泉峰科技有限公司 | Angle grinder and electric tool |
| WO2020173487A1 (en) * | 2019-02-27 | 2020-09-03 | 南京德朔实业有限公司 | Long pole power tool |
| CN112706043A (en) * | 2019-10-25 | 2021-04-27 | 南京德朔实业有限公司 | Electric tool |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106392836B (en) | 2020-12-01 |
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Address after: 211106 No. 529, 159, Jiangjun Avenue, Jiangning District, Nanjing, Jiangsu Province Patentee after: Nanjing Quanfeng Technology Co.,Ltd. Address before: 211106, No. 159, general road, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Patentee before: NANJING CHERVON INDUSTRY Co.,Ltd. |