CN101389448A - Flow medium-driven hand-held machine tool - Google Patents

Abstract

Disclosed is a hand-held power tool with a housing (12) and a tool (70)-a cutting tool, in particular-located thereon in a manner which allows it to be driven in a rotating and/or oscillating manner, it being possible to operate the tool (70) using a suction air flow, via a vacuum cleaner, in particular; the hand-held power tool is made particularly robust and safe against becoming clogged with chips by the fact that it is driven by a turbine (36) with a rotatable turbine wheel (38) and a stationary turbine housing (60); means (100) are located between the turbine wheel (38) and the turbine housing (60) for carrying away dust and chips which accidentally enter this space.

Description

The hand held power machine that flow media drives

The present invention relates to the hand held power machine that the flow media according to the preamble of claim 1 drives.

By patent specification US 6347985 B1 known a kind of hand held power machine, it only drives by the suction air stream of dust catcher.The core component of this known hand held power machine is traditional bucket-type turbine (Pelton-Turbine), and it uses the suction air of dust catcher to make drive shaft rotate and drive thus cutter.This known hand held power machine has axial turbine and bucket-type turbine, it is also referred to as the resistance rotor, only based on air pulse mechanical output is flowed to axle, the efficient of this hand held power machine and durability only can satisfy conditionally to the ability to work of this hand held power machine that can be driven by the common dust catcher in market and the high request of sucking-off power.Especially can arrive in the narrow seal clearance between turbine and the turbine shroud with sucking particle that air stream sucks by structure qualification.There, do not have the possibility of discharge for big particle, their gatherings by therein can make clamped and its power of turbine be adversely affected.

Advantage of the present invention

Having the advantage that the present invention of the feature of claim 1 has is, can be only by for example dust catcher the suction air operated, have rotating turbine and a fixing turbine cylinder turbine as cutting usefulness, especially be configured to the drive unit of hand held power machine of motor of the nothing oneself of milling drum or Milling Machine, wherein between turbine and turbine cylinder, be provided with and be used to discharge the particle that accident enters such as the device of dust and abrasive dust, have the high efficiency that combines with high durability for its application purpose.The extra high share that sucks or be blown into the energy of flow of air thus is convertible into mechanical output.In addition by continue dirt bits particle that output forms in grinding process for surrounding air guaranteed almost the mill of dustless bits, milled, brill etc., make high cutting output unified mutually thus with the efficient sucking-off of grinding dirt bits, in brief, obtain a kind of modification of particularly advantageous turbine, be close to the intermediate form between through-flow radial turbine machine of tradition and the axial turbine, it constitutes the through-flow radial turbine machine in diagonal angle.The advantage that its advantage that the pressure loss is little and air stream energy output are high combines, and constitutes the high efficiency drive device for the electric tools by air stream thus.Discharge the danger that air causes and eliminate by the particle that contains that drives turbine and flow through it for this reason by certain device.These devices are arranged on and are used to export or discharge spuious dust and abrasive dust particle between turbine and the turbine cylinder, and these particles can leave main air flow and enter between the moving component of turbine, disturb their motion.

These devices constitute near at least one hole that penetrates turbine cylinder the inflow point that drives air, and thus, particle can leave turbine again on short path, and appreciable obstruction or braking action can not occur.Can reach by the particular configuration of turbine cylinder and the hole of being arranged: especially big particle can be derived from the gap between turbine and the turbine cylinder diametrically based on its direction of motion before they may cause chucking.

Described device also constitutes by the surface depression of turbine and/or the surface roughness that improves, especially the hole with turbine cylinder is adjacent to arrange, be used to carry particle and produce preferred air that pulse, flow towards described hole, so that blow out particle, improved continuous particle output thus and further reduced the danger that the relative turbine cylinder of turbine tightens by this hole.

Settle one to be connected the turbine front, fixed leading grid, these leading grid are as the bearing block of the bearing of turbine wheel shaft, and it bears the bearing function of machine hand tool housing structure thus, and the manufacturing cost of this hand held power machine can keep low especially thus.

Drive unit only is made up of light working of plastics, and this hand held power machine especially gently reaches easy to use thus.

This hand held power machine is provided with a wireless switching, can connect and turn-off dust catcher by this wireless switching, can operate hand held power machine or dust catcher comfortable and simply thus.

Carry out rotational speed regulation to hand held power machine by the air register that can differently regulate, the simple and cost of available thus simple means advantageously makes machine rotational speed adapt to current operating conditions.

The housing of hand held power machine by tubulose, can form by the part that flange connects each other, F-SP is stable and firm under the little situation of deadweight thus.

Accompanying drawing

Describe the present invention in detail by embodiment and accompanying drawing below.

Accompanying drawing is represented:

Fig. 1: a vertical section of oscillatory type milling drum,

Fig. 2: be used to drive the vertical section of the turbine that has leading grid of oscillatory type milling drum,

Fig. 3: according to a side view of the turbine of Fig. 2,

Fig. 4: have the side sectional view of the turbine of turbine cylinder,

Fig. 5: the vertical view of turbine and turbine cylinder,

Fig. 6: the oblique view of turbine and turbine cylinder,

Fig. 7: the vertical view of turbine cylinder,

Fig. 8: the vertical view of turbine,

Fig. 9: the side view of the smear metal outlet in the turbine cylinder,

Figure 10: the vertical view of the smear metal outlet in the turbine cylinder.

The explanation of embodiment

Fig. 1 illustrates hand held power machine 10, and it constitutes the oscillatory type milling drum, sees with its inboard towards the vertical shell 14 of observer's housing.This housing shell and second a housing shell unshowned, basic symmetry constitute the housing 12 with mitriform of longitudinal axis 13.This housing 12 is synthetic with set screws by two housing shells, and the housing shell that these screws can pass unshowned outside from the outside is screwed into the screw base 35, and two housing shells are engaged at seam crossing.Housing 12 carries out the transition in the handle 16 of the hollow cylinder of holding up transverse to longitudinal axis 13 on the side 20 thereon, and this handle is as suction air outlet 18.Housing 12 has air register 22 on the side 20 thereon, and this air register discharges as required or the hole 24 of closing the flow channel 26 that leads to housing 12 inside enters to regulate air.The zone 86 of a conduit wall 28 is led near hole 24 tight for this reason, makes that the suction air in the flow channel 26 of hose type can be communicated with extraneous air.Conduit wall 28 remains on the housing shell 14 by supporting rib 30.Supporting rib 30 is connected with the ribs 32 of housing shell 14 inside and is connected with housing outer wall or housing shell 14 by these ribs.Air duct 26 or conduit wall 28 are reinforced thus, especially can resist with the suction air vibration or the resonance that flow through.

Housing 12 the bottom terminate in one straight around following seamed edge 34 in, this time seamed edge constitutes the triangle on the limit with outside arching in its downward upright projection.Be provided with a grinding dish 70 abreast with following seamed edge, but this grinding dish forms being connected of elastic movement by flexible vibrating body 75 with housing 12.Grinding dish 70 outwards surpass with its flatiron shape bottom surface seamed edge 34 down leg-of-mutton, projection vertically downward profile and on its downside, have holding device, be used to receive unshowned abrasive sheet.The grinding dish can be driven by rail mounted by axle 72 and eccentric wheel unshowned, that be not engaged on its end with relatively rotating, so that each point of grinding dish, each abrasive particle of abrasive sheet is retouched out a little circle thus, i.e. the typical grinding figure of rail mounted vibration grinding machine.

Axle 72 is carried the rolling bearing 64 that reaches a bottom that rotates and pass through a top by the turbine 38 of the turbine 36 that an available air drives, 66 are rotatably supported in housing 12 or the leading grid 74, be engaged in the 3rd rolling bearing 68 with its bottom, the latter is not engaged in the grinding dish 70 with its outer ring with not relatively rotating.Axle 72 is not connected with balance mass 78 with not relatively rotating between the rolling bearing of bottom and the 3rd rolling bearing 66,68, and it is uneven that this balance mass is used for compensation, so that make the vibration and housing 12 disengagings of the grinding dish 70 of eccentric motion.

Balance mass 78 has the circular contour 80 that projects upwards at its upper side towards leading grid 74.This circular contour is had little spacing ground by a cannelure 82 in the above and surrounds, this cannelure be arranged in next-door neighbour's the downside of leading grid 74 and with the circular contour 80 common curved labyrinth sealings 84 of returning that constitute a bottom.This labyrinth sealing can prevent in the cavity by hand held power machine 10 inside, especially the negative pressure between balance mass 78 and the leading grid 74 makes dust and smear metal move to the bearing 66 of this gap or bottom, and they are remained unaffected for a long time.

Axle 72 is not surrounded at the center by turbine 38 with relatively rotating, wherein produce the sealed connection of shape closely by the annular knurl 73 in the definite circumferential area in axle 72 middle parts roughly between these two parts, the plastics that flow in injection moulding process enter in the depression of this annular knurl and cause this connection thus.

Turbine 38 has bell outline, wherein axially connects one downwards on following seamed edge 34 and does not remain on the leading grid 74 that have grid blade 75 that maybe can be clamped in the housing 12 between the housing shell 14 with not relatively rotating.The turbo blade 42 the same plastic strips that on its narrow side, stretch out that constitute of grid blade 75 and turbine 38.Being configured to the turbine cylinder 60 that the leading grid 74 of cutting back awl externally are not placed in the housing 12 with not relatively rotating yet overlaps at least in part, the distance that separates the height of grid blade 75, so that part is continued in the bottom that constitutes the annular flow passage 49 of turbine 38 thus, sucks air by this flow channel suction or guiding.The suction air that being used to of flowing into from below drives turbine 38 deflect on its flow direction by grid blade 75 or the direction of turbo blade 42 flow channel 49 or turbine 38 on and removed vortex so that can significantly improve the efficient of the especially input side of turbine 36 thus.Leading grid 74 are configured for the bearing block of bearing 66 of axle 72 lower areas with a central opening 76 on its downside, and this bearing makes this axle be fixed in the housing 12 and to its guiding.

Turbine cylinder separates certain interval apart from the outside of ground encirclement turbine 38 and the sealing flange 56 of annular thereof in the zone at an upper portion thereof with cannelure 57, and constitutes top labyrinth sealing 51 there.For the outside that arrives turbine 38 being discharged as quickly as possible more therefrom with spuious smear metal between the turbine cylinder 60 and dust granule and can at first not making turbine 38 brakings or obstruction, in turbine cylinder 60, on two opposed sides, respectively be provided with a hole 102 (Fig. 5) near the cannelure 57.Unwelcome particle can be shifted out from these holes 102, not only pass through the machinery conveying effect of turbine 38, and by the air stream except that the suction air stream that is used to drive turbine, the configuration of outer surface in the zone in hole 102 that turbine 38 is crossed in this circulation of air forms in the gap between turbine 38 and turbine cylinder 60 when turbine 38 rotates.

Fig. 2 illustrates a turbine 38 and an axially downward vertical section that be connected, that be fixed on the leading grid 74 in the housing 12 as details, and they illustrate with assembled state in Fig. 1.Can see the support cone 48 truncated cone shape, outside arching of the crush cones of similar lemon squeezer at this, it externally has a plurality of turbo blades 42, the configuration of these blades has the flat plastic strip of arranging from support cone 48 with its narrow side with stretching out, and their height increases gradually towards the direction of the virtual vertex of a cone.Connecting on the turbo blade 42 one with respect to support cone 48 or turbo blade 42 on the lid awl 44 that extends of seamed edge almost parallel ground.Bore at support cone and lid thus and form the flow channel 49 that a cross section is an annular between 48,44.This flow channel is divided into a plurality of circuitous single passages by turbo blade 42, and the suction air that is used to drive turbine 36 in these single passages can flow with especially little flow resistance.The lower limb of support cone 48 is with respect to the axis of cone line roughly 45 that tilts, and is not as in traditional radial turbine machine with respect to axis of cone line vertical curve about 90 °.The inflow angle of blade is that to go out to flow the angle be 30 ° for 40 ° and its in a particularly advantageous embodiment of turbine 36.Motion arrow 62 expression: the air that moves on the turbo blade 42 is measured 45 ° of deflections with respect to axis 40, does not wherein also consider the deflection vertical with respect to drawing.

Lid awl 44 on top in the zone of the virtual vertex of a cone 46 with the distance of minimum conduit wall 28 in abutting connection with air duct 26, suck air and help fluidly by towards negative pressure source or dust catcher guiding by this air duct.

The truncated cone of support cone 48 or turbine 38 is passed by a central hollow cylinder 54 that is used to receive pivot pin 72.This hollow cylinder 54 constitutes the ring 52 of an outstanding annular in the zone of top at the virtual vertex of a cone.Hollow cylinder 54 reaches such length thus, make axle 72 on definite zone of the axial overhang of determining and its annular knurl 73, be positioned at the inside of hollow cylinder 54 with these annular knurl 73 anti-loose grounds and surrounded, between turbine 38 and spools 72, reach reliable anti-rotation thus and fix by this hollow cylinder with respect to turbine.

The truncated cone female cap awl 44 that increases ground spill arching towards the virtual vertex of a cone 46 directions gradually is in the sealing flange 56 that has an annular on its lateral surface in its bottom 1/3rd highly.For axial cooperation, the sealing flange is arranged in the cannelure 57 of an overlap joint, this cannelure be arranged on shelly turbine cylinder 60 on the inboard of turbine 48, play the effect of top labyrinth sealing 51 by the overlap joint of sealing flange 56, can prevent the loss of turbine 36 pressure inside and significantly improve its efficient thus.

In order to move hand held power machine 10, air is sucked out on sucking air outlet slit 18 and crosses from outer flow under the upper side of suction hole 71 the grinding dish 70 and grinding dish 70 and the housing between the seamed edge 34.Arrive in the circular passage 49 of leading grid 74 by outside inhaled air and proceed in the circular passage that reaches turbine 38.

Turbine 38 can cause wear effects and dirt accumulation effect with leading grid 74 there with contacting of air abrasion, dust-laden, and this can have a negative impact to the power and the life-span thereof of drive unit.In order to tackle this point, with suck face that air contact especially by little, uniformly, the depression of golf formula is by such structuring so that these faces have little flow resistance under the situation of raising surface strength.

In shown in Figure 3, side view, can see that turbine cylinder 60 is together with one in two holes 102 according to the turbine 36 of Fig. 2, wherein turbine cylinder 60 does not remain in the housing 12 according to Fig. 1 with not relatively rotating and fixes or be clamped on the supporting rib 30, hermetically or have clearance distance ground and surround leading grid 74 and turbine 38, constitute the top labyrinth sealing 51 that has explained the front.

In a unshowned embodiment of this hand held power machine, similar to the aforementioned embodiment, its housing has wireless switching, and dust catcher inductive switch is communicated by letter and comfortable and cost advantageously solves turning on and off of dust catcher and hand held power machine by it given in this wireless switching and configuration.

The air that flows through hand held power machine 10 is not as radially inwardly flowing in that turbine 36 intrinsic deflections are pure before axially at it in traditional radial turbine machine, but not only in leading grid 74 but also in the radial turbine machine with respect to longitudinal axis 40 with the mobile (see figure 2) of about 45.This oblique advantage that becomes a mandarin is the efficient that has obviously improved turbine, because the pressure loss in turbine 36 and the leading grid 74 is reduced to minimum.The angle that becomes a mandarin of blade is 60 ° and to go out to flow angle be 30 °, also keeps as far as possible little in order to use the stream loss.The regional angle that is used to become a mandarin can change between 0 ° and 70 °, and the angle that goes out to flow in the zone can change between 10 ° to 60 °.Air mass flow had both been depended in the selection of angle, also depended on desired rotating speed.Task degree of the being air stream of leading grid 74 applies big as far as possible reversing in advance, for this reason it to have exit angle be about 80 ° grid blade 75.Small distance between leading grid 74 and the turbine 36 is necessary, and turbine 36 can be met stream ideally thus.Additional support ring 88 between the ribs 90 on support cone 48 downsides stops the surging and the uncontrolled no-load speed of turbine, this no-load speed can obtain 20000 rev/mins of very high values (〉) because can not occur the fanning effect that the rib owing to pure radial arrangement produces thus.Support ring 88 and ribs 90 from inner radial outwards its size determine attenuation gradually, thus when pressure injection-moulded material can be from inside to outside fast and resistance flow littlely and fill with all cavitys of mold.

Additional ring 52 on the interior ring of turbine 38 is necessary, so as that to insert or be injection molding the axle of sealing 72 can be at the middle part by annular knurl.Owing to the bearing 66 of reason bottom, position directly is combined in the leading grid 74, make hand held power machine 10 can have flat frame mode.

The turbine 36 that Fig. 4 neutral body is described comprises a turbine 38, and this turbine is surrounded the leading grid 74 of this turbine cylinder encirclement below turbine 38 by a turbine cylinder 60.

Between the outer surface of turbine cylinder 60 that partly illustrates and turbine 38, can see that three are described conglobate particle, for example grinding dirt bits or smear metal 108 with dissecing.Process oval-shaped impression 103 on the outer surface of this external turbine 38, they can make surrounding air quicken and produce the air stream of pulsation, can take away or preferably on leading grid 74 directions, carry spuious particle 108 between turbine cylinder 60 and turbine 38 thus, can arrive in the main air flow of outside dust catcher direction at these these particles, the latter not only is used to drive turbine 36 as drive medium, and is used to derive particle.Conversion ground, particle 108 can be pushed to and/or blow to hole 102 (Fig. 3,5).

Fig. 5 represents the vertical view of turbine 36, wherein can see turbine 38, it is surrounded by turbine shroud 60 in upper area, wherein also can see two holes 102 that are used to derive smear metal that in upper area, on the side that opposes each other, penetrate turbine cylinder 60, see through the adjacent lateral surface that turbine 38 can be seen in these holes.

Fig. 6 represents a space side view of turbine 36, wherein mainly can see with Fig. 5 in identical details, but can be more clearly visible the configuration in the hole 102 of key cellular type.Columniform turbine cylinder 60 mitriform of ladder become four ladder sections to extend downwards with widening with staggering.Each is passed by a radial and axial hole that penetrates 102 uppermost cylindrical ladder section on the side that opposes each other, and these holes extend in the ladder section of back to back taper of axially following downwards.Hole 102 is configured to the key cellular type.9mm is wide in the above for they, and 3mm is wide below, about 15mm height.Their bottom hole zone 111 is with respect to regional 112 arranged off-centre of upper hole, on direction of observation to left avertence.

Not only extend to upper left in the axial direction with respect to longitudinal axis 40 outward-dippingly the rising edge 120 that is in the left side on the direction of observation in hole 102, sees Fig. 9, angle α, and lean outward diametrically and tiltedly open.Therefore the 120 pairs of smear metals that discharge on the direction of rotation according to direction of rotation arrow 130 of turbine 38 in rising edge provide only very little blocking surface, have set up favourable smear metal thus and have discharged situation.

According to Fig. 5 and 7 as can be seen, the upper area 112 in hole 102 has semicircular profile in the end face of the level of the columniform turbine cylinder 60 of ladder, and this profile is passed by the bottom hole zone 111 of v shape towards the outer surface of vertical decline.Semicircular upper area 112 carries out the transition to the section of the downward v shape contraction that is connected with it or the v shape seamed edge 120 in bottom hole zone 111, in 121, wherein in the transition part of semicircular area 112, constitute the cutter seamed edge 140 of the ramp type of an angled β in rising edge 120, it has improved the smear metal discharge, because particle is in the face of minimum blocking surface thus.

Fig. 7 illustrates the vertical view of turbine cylinder 60, has the hole 102 that two opposition are arranged.

Fig. 8 illustrates the details of turbine 38, has setting leading grid 74 in its lower section, and turbine cylinder 60 can axially be clamped on these leading grid.

Fig. 9 illustrates the amplification details according to a hole 102 in the side view of Fig. 6, wherein motion arrow 160 illustrates the discharge direction of particle 108, wherein can see the inconsistent v shape profile in hole 102, has the seamed edge that the warpage that makes progress goes out, so that constitute the V-arrangement of the acute angle of bottom, it carries out the transition in the V-arrangement at an obtuse angle on farther top.

Figure 10 illustrates amplification plan view according to a hole 102 in the vertical projection diagram of Fig. 5 or 7 as details, wherein especially can be clear that cutter seamed edge 140.

Arrival turbine 38 that is produced and the smear metal 108 between the turbine cylinder 60 by hole 102 the dihedral geometry and its position in turbine cylinder 60 is directed on the cutter rising edge 120 by turbine 38 in the clockwise direction and there by obliquely along rising edge 120 with radially outward push away therefrom or be blown in the inner room of housing 12.

Coming from the smear metal in hole 102 can come out from housing 12 by unshowned passage of drawing downwards.In housing 12, can in the zone in hole 102, be provided with and check valve or hole, can get rid of and obstinate smear metal to gather from the outside with hand by them.

Claims (12)

1. hand held power machine, have a housing (12) and one and can be arranged on cutter on this housing, that especially cut (70) with being driven in rotation, this cutter can be by the suction air stream operation according to the rules that especially produces by dust catcher, it is characterized in that: the turbine (36) with rotating turbine (38) and fixing turbine cylinder (60) is as drive unit, wherein is provided with to be used to discharge the particle (108) that undesirably the enters device (100) as dust and smear metal between turbine (38) and turbine cylinder (60).

2. according to the hand held power machine of claim 1, it is characterized in that: described device (100) constitutes with the configuration that at least one penetrates the hole (102) of turbine cylinder (60).

3. according to the hand held power machine of claim 1 or 2, it is characterized in that: described device (100) has surface depression (103) and/or improves in turbine (38) surface roughness, especially the hole (102) with turbine cylinder (60) is adjacent to arrange, be used to carry particle and produce preferred air that pulse, flow, so that blow out particle by this hole (102) towards described hole (102).

4. according to the hand held power machine of one of above claim, it is characterized in that: this turbine is provided with the device that is used to make the air calmness that flows into or flow out, especially be provided with leading grid (74) and/or after lead grid, wherein flow to air stream on the turbine (38) with respect to the longitudinal axis (40) of turbine (38) with an acute angle, especially continued delivery or deflection with 50 °.

5. according to the hand held power machine of one of above claim, it is characterized in that: turbine (38) is provided with labyrinth sealing (51), and its protection turbine (36) is in order to avoid the pressure loss.

6. according to the hand held power machine of one of above claim, it is characterized in that: leading grid (74) bearing block (76) of the bearing (66) that acts on axle (72).

7. according to the hand held power machine of one of above claim, it is characterized in that: it has balance mass (78), and the structure (80,82) of this balance mass and leading grid (74) constitutes a labyrinth sealing (84) jointly.

8. according to the hand held power machine of one of above claim, it is characterized in that: leading grid (74) are packed in the structure of housing (12) like this, so that this leading grid make this housing reinforcement.

9. according to the hand held power machine of one of claim 1 to 8, it is characterized in that: the air that is used to drive turbine (38) is directed into this turbine at radially outer from the outside on the rotation direction of turbine (36), then radial skew ground, then carry out the transition to axially by outward flange sucking-off from turbine (38).

10. according to the hand held power machine of one of above claim, it is characterized in that: it constitutes the flat surface grinding machine, especially the oscillatory type milling drum.

11. the hand held power machine according to one of above claim is characterized in that: and then hole (102) settle the passage of drawing downwards between turbine cylinder (60) and housing (12), are used for discharging the smear metal of leaving hole (102).

12. the hand held power machine according to one of above claim is characterized in that: go up the inspection valve (150) that the hole is led in arrangement in the zone of hole (102) at housing (12), pass them and can gather from the outside with the hand scrap fallaway.

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