CN107030608B - sanding machine - Google Patents

Abstract

The invention discloses a sander, comprising: the fan comprises a shell, a motor, a bottom plate, a transmission assembly and a fan; the shell is provided with a handle part, the motor is accommodated in the shell, the bottom plate is used for installing a polishing piece, the transmission assembly is used for realizing transmission between the motor and the bottom plate, and the fan can be driven by the motor to rotate by taking an axis as a shaft; wherein, the bottom plate is formed with: the transmission assembly accommodating cavity can be at least partially accommodated; the fan is formed with: an air outlet; the air outlet is used for discharging airflow generated when the fan rotates from the fan; when the fan rotates, the air flow discharged from the air outlet can flow at least in the direction away from the accommodating cavity and towards the upper side surface of the bottom plate. The sander has the advantages of good heat dissipation effect, low power consumption of the fan, low noise and contribution to reduction of the axial size of the whole sander.

Description

Sander

Technical field

The present invention relates to a kind of electric tools, and in particular to a kind of sander.

Background technique

Flat sanding machine is realized by the ring-swing of every bit on bottom plate in the materials table such as timber, plastics, stone material, metal Face carries out polishing grinding.But biography of the sander in loaded work piece, at carbon brush commutation component, electric machine rotor component and bottom plate The heating power of dynamic component is higher, directly affects the load life and user's operation comfort of complete machine.

It is existing in order to radiate to sander, it will usually there are two fans for setting in sander, and one is motor Fan, the other is the centrifugal fan outside motor.Wherein, electric motor fan is used for commutate component, rotor to the carbon brush of motor Component radiates；Centrifugal fan is used to radiate to the transmission component at bottom plate.But such structure makes in sander Two-way radiating airflow is formed, not only heat dissipation effect cannot be guaranteed, but also power consumption is higher, noise is larger, even complete machine Size is also larger.

Summary of the invention

A kind of sander, comprising: shell, motor, bottom plate, transmission component and fan；Shell is formed with handle portion, and motor holds It is contained in shell, bottom plate is used to realize transmission between motor and bottom plate for installing polishing part, transmission component, and fan can be electric Machine driving is rotated by axis of an axis；Wherein, bottom plate is formed with: at least can partially accommodate transmission component accommodating chamber；Fan is formed Have: air outlet；The air-flow that air outlet is used to generate when fan rotates is discharged from fan；Wherein, when fan rotates, from out The air-flow of air port discharge can at least be flowed to far from accommodating chamber and towards the direction of the upper side of bottom plate.

Further, shell is formed with: being connected to the inside and outside air flow inlet of shell；What is generated in fan rotation flows into from gas Mouth enters shell and can at least flow through motor by the air-flow that air outlet is discharged.

Further, on the direction along the pivot center of fan, the whole size that fan and transmission component are constituted is big It is less than or equal to 40mm in being equal to 18mm.

Further, on the direction perpendicular to the pivot center of fan, fan is at least partially disposed in the outer of accommodating chamber Between wall and the inner wall of shell.

Further, fan includes: bracket, more than two flabellums and air dam；Bracket is for making fan with motor Motor shaft rotation, flabellum are arranged around bracket, and air dam can be oriented to air-flow and tilt the direction intersected along with the pivot center of fan Air outlet is discharged；Wherein, air outlet is formed between two adjacent flabellums.

Further, air dam is formed with wind-guiding face；The friendship of wind-guiding face and the plane of a pivot center through passing through fan Straight line where line intersects with the inclination of the pivot center of fan.

Further, in a ring, air dam connects two adjacent flabellums to air dam；In the side of the pivot center along fan Upwards, the inward flange of air dam is higher than the outer edge of bracket.

Further, flabellum includes: upper edge；Upper edge extends to the outside of bracket from the inward flange of air dam Edge.

Further, on the direction along the pivot center for being parallel to fan, between two adjacent flabellums up and down.

Further, sander further include: pod；Pod is formed with energy backstop and hangs down from the air-flow edge that air outlet is discharged The guide face directly flowed in the direction of the pivot center of fan.

The good heat dissipation effect of the sander, and the power consumption of fan is low, the low noise of generation, but also can be conducive to The diminution of complete machine axial dimension.

Detailed description of the invention

Fig. 1 is the structural schematic diagram of sander；

Fig. 2 is the sectional view of the sander part-structure in Fig. 1；

Fig. 3 is the sectional view of the fan in Fig. 2；

Fig. 4 is the three-dimensional structure diagram of the fan in Fig. 2；

Fig. 5 is the three-dimensional structure diagram at another visual angle of the fan in Fig. 2；

Fig. 6 is the three-dimensional structure diagram of the pod in Fig. 2.

Specific embodiment

Specific introduce is made to the present invention below in conjunction with the drawings and specific embodiments.

As depicted in figs. 1 and 2, sander 100 may include: shell 11, switch 12, bottom plate 13, motor 14, transmission component 15 and vibration rack 16.

Wherein, profile portion of the shell 11 as sander 100 is formed with handle portion 111, receiving portion 112 and bracket Portion 113.Handle portion 111 is used to hold for user, one end connect with receiving portion 112, the other end can be used to connect outside The cable of power supply connects.For receiving portion 112 between handle portion 111 and cradle portion 113, inside forms accommodation space, motor 14 It can be set in accommodation space.Cradle portion 113 is for covering at least partly vibration rack 16.

Switch 12 can be installed on the handle portion 111 of shell 11, in this way, user is when holding handle portion 111, Neng Gouxiang To convenient trigger switch 12, which can be the main switch for starting sander 100.

Bottom plate 13 realizes the function of grinding and buffing for fixing polishing part.Bottom plate 13 is used for close to the side of shell 11 Vibration rack 16 is set, and the other side of bottom plate 13 is for fixing the polishing parts such as sand paper.Here, the setting vibration of bottom plate 13 might as well be defined The side of bracket 16 is upper side, and the side that the polishing parts such as sand paper are arranged in bottom plate 13 is downside.

The prime mover of motor 14 as sander 100, is set in shell 11.Motor 14 includes for outputing power To the motor shaft 141 of transmission component 15, motor shaft 141 can be axis rotation around electrical axis.

Transmission component 15 is set between motor 14 and bottom plate 13, for realizing transmission between motor 14 and bottom plate 13, So that bottom plate 13 is swung relative to shell 11.For sander 100 shuttle-type for plate, transmission component 15 can be passed Eccentric motion is passed, to realize that bottom plate 13 is swung by axis of center axis thereof.Specifically, transmission component 15 for example can wrap Include: eccentric part, bearing and clump weight etc. no longer specifically introduce the detailed construction of transmission component 15 here.

In order to install transmission component 15, bottom plate 13 is also formed with an accommodating chamber 131, and accommodating chamber 131 is at least partly Accommodate transmission component 15.

Vibration rack 16 is mounted between bottom plate 13 and the cradle portion 113 of shell 11, and vibration rack 16 is used in bottom plate 13 During the motion, limitation bottom plate 13 swings it within the scope of predetermined angle, avoid bottom plate 13 swing beyond predetermined angle and Rotation.

As shown in Figures 2 and 3, sander 100 further include: fan 20 and pod 30, fan 20 and pod 30 are arranged Between motor 14 and bottom plate 13.

Fan 20 can be driven by motor 14 and rotate by axis of an axis, which is turning for fan 20 illustrated in fig. 2 Shaft line 101, the pivot center 101 and the electrical axis of motor shaft 141 of fan 20 are parallel to each other, furthermore, fan 20 Electrical axis of the pivot center 101 also with motor shaft 141 overlap.Fan 20 is also formed with: air inlet 21 and air outlet 22, shell 11 is formed with: air flow inlet 114 and air stream outlet 115.

As shown in Figures 2 and 3, when it is that axis rotates that fan 20 is with the pivot center 101 of its own, can generate can at least be given The air-flow that sander 100 radiates, the air-flow enter in shell 11 from the air flow inlet 114 of shell 11, then pass through air inlet 21 enter to fan 20, then fan 20 is discharged from air outlet 22, finally flow out to shell 11 from the air stream outlet 115 of shell 11 It is external.The generated above air-flow can also at least flow through motor 14 to fan 20 when rotating and bottom plate 13 is formed by accommodating chamber At 131 outer wall, the air-flow can not only radiate to motor 14 in this way, additionally it is possible to the transmission group being arranged in accommodating chamber 131 Part 15 radiates, to improve heat dissipation effect, extends the service life of transmission component 15.

Wherein, for shell 11, air flow inlet 114 is connected to the inside and outside of shell 11, in the pivot center along fan 20 On 101 direction, air flow inlet 114 be can be set in the top of motor 14, and more specifically, air flow inlet 114 can be set On the handle portion 111 of shell 11, in this way, the air-flow energy for flowing into shell 11 by air flow inlet 114 and being discharged by air outlet 22 Motor 14 is enough flowed through, is radiated to motor 14.Air stream outlet 115 is also connected to the inside and outside of shell 11, in the rotation along fan 20 On the direction of axis 101, air stream outlet 115 be can be set in the lower section of motor 14, and more specifically, air stream outlet 115 can be with It is to be formed by the opening of the lower end of shell 11, the accommodating chamber 131 of air stream outlet 115 and bottom plate 13 is generally disposed at same axial direction Position reaches to can also flow through the outer wall of accommodating chamber 131 by the air-flow that air stream outlet 115 flows out shell 11 to transmission The purpose that component 15 radiates.

In order to realize better heat dissipation effect, for fan 20, fan 20 is formed by air inlet 21 and is used for wind Generated air-flow is introduced to fan 20 in shell 11 when 20 rotation of fan, and fan 20 is formed by air outlet 22 for will be in wind The air-flow generated when 20 rotation of fan is discharged from fan 20.Wherein, when fan 20 rotates, the air-flow being discharged from air outlet 22 is at least It can be flowed to far from accommodating chamber 131 and towards the direction of the upper side of bottom plate 13.Wherein, air-flow to far from accommodating chamber 131 side To flowing so that air-flow after the outer wall for flowing through accommodating chamber 131 further away from accommodating chamber 131, so as to which transmission component 15 is passed The heat for being handed to accommodating chamber 131 is taken away, and then achievees the purpose that radiate to transmission component 15.In addition, air-flow is towards bottom plate 13 direction flowing, enables to air-flow to blow to bottom plate 13, then flows out to outside shell 11 using air stream outlet 115, a side Face, the air-flow can radiate to bottom plate 13, that is to say that the air-flow can be simultaneously to motor 14, transmission component 15 and bottom plate 13 radiate, and on the other hand, air-flow can also effectively blow out the dust on bottom plate 13 to outside shell 11, reach dedusting Effect, and be conducive to assembled machine balance.

Specifically, as shown in Figures 2 to 5, fan 20 includes: bracket 23, flabellum 24 and air dam 25.

The composition of motor shaft 141 of the roughly annular structure of bracket 23, bracket 23 and motor 14 is fixedly connected, bracket 23 it is interior Snare certainly, is also provided with other on motor shaft 141 between the inner ring of bracket 23 and the outer ring of motor shaft 141 Components, as long as bracket 23 can make fan 20 rotate together with motor shaft 141.

Fan 20 includes more than two flabellums 24, and multiple flabellums 24 are arranged around the outer ring of bracket 23.In other words, it fans The direction that the outer ring of leaf 24 from bracket 23 is directed away from bracket 23 extends.It is formed between two adjacent flabellums 24 above Described air inlet 21 and air outlet 22.Along 101 direction of pivot center for being parallel to fan 20, air inlet 21 is arranged two Space lower end clamped between two flabellums 24 is arranged in the upper end in clamped space between a flabellum 24, air outlet 22.

Substantially also in a ring, air dam 25 connects two adjacent flabellums 24, further, air dam 25 to air dam 25 All flabellums 24 of fan 20 can be made to be connected as one on the circumferencial direction centered on the pivot center 101 by fan 20 It is whole.In this way, air dam 25 makes the upper part closing in space clamped between two flabellums 24, to reduce air inlet The size of mouth 21, improves flow velocity.

Air dam 25 can also be oriented to air-flow and air outlet is discharged along the direction intersected is tilted with the pivot center 101 of fan 20 22, specifically, air dam 25 is formed with wind-guiding face 251.In the plane perpendicular to the pivot center 101 of fan 20, wind-guiding In the annulus that is projected as of the plane, the inner ring of annulus may be considered the inward flange 252 of air dam 25 in face 251, annulus Outer ring may be considered the outer edge of air dam 25；Likewise, bracket 23 turns perpendicular to fan 20 for bracket 23 Projection in the plane of shaft line 101 may be an annulus, and the inner ring of the annulus may be considered the inward flange of bracket 23, The outer ring of the annulus may be considered the outer edge 231 of bracket 23.

For wind-guiding face 251, it is radial that we, which might as well be defined through the plane of the pivot center 101 of fan 20, here Plane, wind-guiding face 251 intersect with the inclination of pivot center 101 of straight line and fan 20 where the intersection of sagittal plane.In this way, leading Wind face 251 air dam 25 to be oriented to air-flow to enter between two flabellums 24 from air inlet 21 in clamped space simultaneously Along tilting the direction discharge air outlet 22 intersect with the pivot center 101 of fan 20, thus air-flow from air outlet 22 along with fan The direction flowing of the 20 inclination intersection of pivot center 101, the air-flow is not only in the side along the pivot center 101 for being parallel to fan 20 There are air flow components upwards, while there are air-flows point along direction of the air-flow also on edge perpendicular to the pivot center 101 of fan 20 Amount, and the air flow component therein on the direction of the pivot center 101 of fan 20 can be to the formed accommodating chamber 131 of bottom plate 13 Outer wall carry out forced convertion heat dissipation, in addition in the air flow component on direction perpendicular to the pivot center 101 of fan 20 It can be in the upper side wind speed with higher of bottom plate 13, so as to blow dust accompanying by 13 upper side of bottom plate off.

For the specific structure of fan 20, the extending direction of multiple flabellums 24 has certain rotation direction, that is to say fan Leaf 24 is extended along cambered surface direction.For each flabellum 24, may include: interconnecting piece 241, upper edge 242, Lower edge portion 243 and peripheral portion 244, wherein interconnecting piece 241 is used for so that flabellum 24 is connected to bracket 23, and adjacent two Above mentioned air inlet 21, the lower edge portion of two adjacent flabellums 24 are formd between the upper edge 242 of a flabellum 24 A part of above mentioned air outlet 22 is formd between 243, is formed between the peripheral portion 244 of two adjacent flabellums 24 Another part of above mentioned air outlet 22.Wherein, air inlet 21 and air outlet 22 also make two adjacent flabellums 24 Between on the direction along the pivot center 101 of fan 20 up and down.

On the direction along the pivot center 101 of fan 20, the inward flange 252 of air dam 25 is higher than the outer edge of bracket 23 231, the upper edge 242 of fan 20 extends to the outer edge 231 of bracket 23 from the inward flange 252 of air dam 25, so that Upper edge 242 extends from air dam 25 along direction gradually downward, to be located at other parts of 20 or more fan in fan Can have with fan 20 on 20 101 direction of pivot center and partly overlap, and then sander 100 can be reduced in fan 20 Size on 101 direction of pivot center.

On the direction perpendicular to the pivot center 101 of fan 20, the setting of peripheral portion 244 is in flabellum 24 farthest away from bracket At 23 position, peripheral portion 244 connects air dam 25 and lower edge portion 243, and the substantially edge of peripheral portion 244 is parallel to fan 20 Pivot center 101 direction extend.

Lower edge portion 243 extends to the outer edge 231 of bracket 23 from peripheral portion 244, along turn for being parallel to fan 20 On the direction of shaft line 101, the junction of lower edge portion 243 and peripheral portion 244 is lower than the company of lower edge portion 243 and bracket 23 Place is met, that is to say that lower edge portion 243 extends from peripheral portion 244 along gradually upwardly direction, thus the accommodating chamber 131 of bottom plate 13 It can be partially submerged into fan 20, that is to say, fan 20 is at least partially disposed in the outer wall of accommodating chamber 131 and the inner wall of shell 11 Between so that fan 20 and accommodating chamber 131 on 101 direction of pivot center along fan 20 there are Chong Die, to reduce receiving The whole size on 101 direction of pivot center along fan 20 that chamber 131 and fan 20 are constituted, and then reduce 20 He of fan The whole size on 101 direction of pivot center along fan 20 that transmission component 15 is constituted, has equally also reached diminution sand The purpose of size of the ray machine 100 on 101 direction of pivot center of fan 20.Specifically, the setting of lower edge portion 243 can be with So that the whole size that fan 20 and the transmission component 15 are constituted is big on the direction along the pivot center 101 of fan 20 It is less than or equal to 40mm in being equal to 18mm, further, whole size and sander 100 that they are constituted is in this direction The ratio of size is more than or equal to 0.12 and is less than or equal to 0.23.

As shown in Figure 2 and Figure 6, pod 30 is used for the flow direction for further playing the role of being oriented to air-flow, pod 30 It is formed with guide face 31.On the direction perpendicular to the pivot center 101 of fan 20, fan can be partially arranged in guide face 31 Between 20 air outlet 22 and the inner wall of shell 11, thus guide face 31 can backstop from the air-flow edge that air outlet 22 be discharged perpendicular to The direction of the pivot center 101 of fan 20 is flowed, and has had air-flow both when being discharged from air outlet 22 perpendicular to wind Air flow component on the direction of the pivot center 101 of fan 20, and there is the air-flow on the direction of the pivot center 101 of fan 20 Component.Specifically, guide face 31 may include one section of arc surface, the arc surface is along the pivot center perpendicular to fan 20 Fan 20 is gradually distance from 101 direction.

The present invention has detected conventional fan and respectively when fan of the invention is mounted in same sander, and in revolving speed one Air mass flow, fan under fixed light condition at the air flow inlet of sander consume power and fan efficiency, wherein fan Efficiency refers to the ratio of air mass flow and fan consumption power, specific as shown in Table 1:

Table one

Also have detected conventional fan and when fan of the invention is mounted in same sander, and the zero load certain in voltage The input power value of current value and sander under state, specific as shown in Table 2:

Table two

Also have detected the current value and sander of conventional fan and fan of the invention under the certain load condition of voltage Input power value, it is specific as shown in Table 3:

Table three

It can be seen that the relatively traditional fan of fan of the invention, the power of fan consumption from table one, table two and table three Apparent reduction is obtained, fan efficiency is greatly improved, and sander complete machine is defeated under unloaded or load condition Entering power is also reduced.

In compared to the prior art inside motor and outside motor is respectively set the structure of fan, the wind in the present invention Fan can not only be realized simultaneously radiates to motor and transmission component, improves heat dissipation effect, and power consumption is also set relatively The structure for setting two fans is low；In addition, be respectively formed on fan compared to others can to motor radiating and to bottom plate into The structure of the flabellum of row dust suction or drifting dust, noise caused by fan of the invention is lower and low in energy consumption, overall efficiency Height, furthermore the axial dimension of sander can also be reduced.

The basic principles, main features and advantages of the invention have been shown and described above.The technical staff of the industry should Understand, the above embodiments do not limit the invention in any form, all obtained by the way of equivalent substitution or equivalent transformation Technical solution is fallen within the scope of protection of the present invention.

Claims (10)

1. a kind of sander, comprising:

Shell is formed with handle portion；

Motor is contained in the shell；

Bottom plate, for installing polishing part；

Transmission component, for realizing transmission between the motor and the bottom plate；

Fan can be rotated by the motor driven by axis of an axis；

Wherein, the bottom plate is formed with:

Accommodating chamber at least can partially accommodate the transmission component；

The fan is formed with:

Air inlet, generated air-flow is introduced to the fan in the shell when for rotating the fan；

Air outlet, for the air-flow generated when the fan rotates to be discharged from the fan；

The air inlet and the air outlet on the direction along the pivot center of fan up and down；

Wherein, when the fan rotates, the air-flow being discharged from the air outlet, at least can be to after flowing through the outer wall of accommodating chamber It is flowed far from the accommodating chamber and towards the direction of the upper side of the bottom plate.

2. sander according to claim 1, it is characterised in that:

The shell is formed with:

Air flow inlet is connected to the inside and outside of the shell；

The air-flow for entering the shell from the air flow inlet and be discharged by the air outlet generated in fan rotation The motor can at least be flowed through.

3. sander according to claim 1, it is characterised in that:

On the direction along the pivot center of the fan, the whole size that the fan and the transmission component are constituted is greater than It is less than or equal to 40mm equal to 18mm.

4. sander according to claim 1, it is characterised in that:

On the direction of the pivot center perpendicular to the fan, the fan is at least partially disposed in the outer wall of the accommodating chamber Between the inner wall of the shell.

5. sander according to claim 1, it is characterised in that:

The fan includes:

Bracket, for rotating the fan with the motor shaft of the motor；

More than two flabellums are arranged around the bracket；

Air dam can be oriented to air-flow along the direction intersected with the inclination of the pivot center of the fan and the air outlet is discharged；

Wherein, the air outlet is formed between two adjacent flabellums.

6. sander according to claim 5, it is characterised in that:

The air dam is formed with wind-guiding face；The intersection of the wind-guiding face and the plane of a pivot center by the fan The straight line at place intersects with the inclination of the pivot center of the fan.

7. sander according to claim 5, it is characterised in that:

In a ring, the air dam connects two adjacent flabellums to the air dam；In the pivot center along the fan Direction on, the inward flange of the air dam is higher than the outer edge of the bracket.

8. sander according to claim 7, it is characterised in that:

The flabellum includes:

Upper edge extends to the outer edge of the bracket from the inward flange of the air dam.

9. sander according to claim 5, it is characterised in that:

On the direction along the pivot center for being parallel to the fan, between two adjacent flabellums up and down.

10. sander according to claim 1, it is characterised in that:

The sander further include:

Pod, being formed with can direction of the backstop from the air-flow edge that the air outlet is discharged perpendicular to the pivot center of the fan The guide face of flowing.