CN201376222Y - Pneumatic turbine type high-speed hand-held grinder - Google Patents

Abstract

The utility model provides a pneumatic turbine type high-speed hand-held grinder, which comprises a small rotating inducer (1), a big rotating inducer (2), a reaction turbine (3), a rotary shaft (4) and a blast nozzle (5). By adopting the two stages of rotating inducers and the reaction turbine and utilizing the technical scheme in which the counterforce of air jet is utilized to do work to convert the pressure potential energy of the compressed air into rotational energy, the utility model solves the problems and defects of the prior vane wheel type hand-held grinder, including low energy conversion efficiency, large and heavy body and hard rotation speed increase, the rotation speed and energy conversion efficiency of the pneumatic turbine type high-speed hand-held grinder are increased, and thereby the utility model achieves the advantages of high speed, high efficiency, light weight and small size.

Description

Air impeller typed high-speed hand-hold grinder

Technical field

The utility model relates to a kind of hand-held pneumatic instrument, specifically is meant to utilize the compressed air-driven turbine to rotate at a high speed, drives a kind of air impeller typed high-speed hand-hold grinder that bistrique is used for the sanding and polishing implements.

Background technology

The pneumatic hand-hold grinder of prior art, be to utilize the compressed air high-speed jet to impact the mode of axial wheel, the rotation function that the part kinetic energy of air-flow is transferred to impeller shaft, change has taken place in the flow velocity and the direction of air-flow, therefore impeller shaft has obtained rotation function and has driven bistrique work, and this process is the exchange process of kinetic energy.The pneumatic hand-hold grinder of the vane type of prior art is in the exchange of kinetic energy process, because the linear velocity of circumference of impeller rotation will be lower than the tail speed of air-flow, in order to improve the rotating speed of impeller shaft, the air-flow velocity that impacts impeller will be enough big, and it is big more to impact flow velocity, the residual stream quick-action loss of energy of tail gas is just many more, makes that exchange of kinetic energy efficient is lower.In addition, in order to exchange to enough energy, the diameter of impeller and air flue will be enough big, and the air flue long enough causes body bigger and heavy.Therefore, there are the problems and shortcomings that energy conversion efficiency is low, body weighs greatly, rotating speed is difficult to improve in prior art.

Summary of the invention

Problems and shortcomings at above-mentioned prior art existence, the utility model adopts secondary rotation inducer, recoil turbine, the reaction force work done that utilizes air-flow to spray, compressed-air actuated pressure potential is converted to the technical scheme of rotation function, a kind of air impeller typed high-speed hand-hold grinder is provided, be intended to improve rotating speed, the energy conversion efficiency of pneumatic hand-hold grinder, make it to reach high speed, efficient, light small and exquisite purpose.

The purpose of this utility model is achieved in that air impeller typed high-speed hand-hold grinder, comprise little rotation inducer, rotate inducer, recoil turbine, rotating shaft, air nozzle greatly, wherein: described little rotation inducer is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, leaf geosynclinal convex face direction is identical with the recoil turbine, opposite with big rotation inducer, the wheel rim external diameter is identical with the recoil turbine, and central shaft hole slides to rotate with rotating shaft and cooperates; Described big rotation inducer is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root are directly identical with little rotation inducer, leaf geosynclinal convex face direction and little rotation inducer and recoil turbine in contrast, the wheel rim external diameter is greater than little rotation inducer and recoil turbine, and central shaft hole slides to rotate with rotating shaft and cooperates; Described recoil turbine is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root are directly identical with little rotation inducer, and the wheel rim external diameter is identical with little rotation inducer, central shaft hole and rotating shaft secure fit; Described rotating shaft is the columniform stainless steel shaft spare of step, and the front end center is provided with awl mouthful blind hole, and the front step cylinder is provided with the clamping breach; Described air nozzle is an aluminium alloy rounding post hollow step cover shape member, its outer big step cylinder is provided with radially symmetrical, accompany two skewed slots at oblique angle with axis, the root footpath of skewed slot is identical with little rotation inducer, and the oblique angle direction is identical with the tangential direction of the streamlined leaf groove of little rotation inducer.

Assembling (each parts mutual alignment and matching relationship)

The mutual alignment of each parts of movement assembly relation is respectively by front step end face to the rear end of rotating shaft, fore bearing, wake flow awl, recoil turbine, rotates that dress rear bearing string is enclosed within the rotating shaft in inducer, little rotation inducer overcoat grommet, the air nozzle greatly; The rotating shaft front end of movement assembly forward, the whole air flue shell that inserts, the rotating shaft front step passes the front aperture of air flue shell, copper mesh pad pad is at the front end of air flue shell, the internal thread of fore shell rear end is tightened on the external screw thread of air flue shell front end, and the copper mesh pad is clipped between the two, and the shunting cover is against the rear end face of rear bearing, back cover puts Spool assembly and is tightened on the internal thread of air flue shell rear end, and the stopcock shell is loaded onto in the rear end of back cover.

The relation of cooperatively interacting is respectively, fore bearing, wake flow awl, recoil turbine and rotating shaft stationary fit, and it is headfirst little that wake flow is bored; Big rotation inducer, little rotation inducer and rotating shaft are slided and are rotatably assorted; The outer rim and the air flue shell inwall of big rotation inducer, recoil turbine are slidingly matched; The outer rim of the inwall of grommet and little rotation inducer is slidingly matched, outer wall and the stationary fit of air flue shell inwall; The big step end of air nozzle forward, step wall is enclosed within on the outer rim of rear bearing rear bearing centre bore and rotating shaft stationary fit in the hollow of rear end; Air nozzle, little rotation inducer, the adjacent face that rotates inducer, recoil turbine greatly are slidingly matched mutually.

Operation principle

During work, compressed air enters in the grinding machine along Spool assembly, through the shunting cover, the skewed slot of air nozzle, the leaf groove of little rotation inducer, the leaf groove of big rotation inducer, the leaf groove of recoil turbine, the steam vent of the air flue shell front end of wake flow awl chamber, the copper mesh pad is gone out outside the grinding machine forward, compressed air was in high pressure conditions be positioned at the wake flow awl chamber of grinding machine front portion in arrival before, pressure discharges rapidly when penetrating the leaf notch of recoil turbine, the leaf groove of recoil turbine is under the effect of high velocity air reaction force, penetrate opposite direction rotation along air-flow, promptly, at recoil turbine leaf groove jet place, the pressure potential of gas directly is converted to the rotation function of recoil turbine, thereby driving rotating shaft rotates at a high speed, if ignore steam vent, some pressure dampings that the copper mesh pad produces, nearly all gas pressure potential energy all can be exchanged into energy of the impinging jet, Newton mechanics law as can be known, the opposite sign but equal magnitude of active force and reaction force, when unloaded, if ignore the frictional damping of recoil turbine and rotating shaft, the linear velocity of the turbine circumference that recoils in theory rotation can equal the effluxvelocity of jet, and the power conversion of recoil turbine type that Here it is is better than impacting the principle of the power conversion of vane type.

In the work, rotation recoil turbine can produce strong eddy current to the proal pressed gas of its inlet end one side at a high speed, promptly constitute the vortex barrier one in inlet end one side, the high speed rotation of the portion of energy retardance recoil turbine of eddy current spent gas, and the fast more then retardance of the rotating speed of recoil turbine is strong more, the whirlpool is decreased and is the index increase, reaches balance until recoil turbine turnover gas two end pressure reduction and rotating speed, and rotating speed again method improves; Therefore, the generation that air nozzle and secondary rotation inducer is eliminated eddy current is set, in the work, the rotation direction of little rotation inducer is opposite with big rotation inducer, and identical with the recoil turbine; When static, by little rotation inducer, rotate inducer greatly, the gas channel that constitutes of recoil turbine is crooked, in the time of dynamically, the leaf groove but is a straight line because of the synthetic air-flow particle dynamic channel of mutual reverse rotation shear, so, the recoil turbine is when high speed rotary motion, fairshaped leaf groove design and driven, the rotation inducer that rotation direction is opposite, with high-pressure flow gas with all assign near the mode of laminar flow and direct current the recoil turbine each leaf groove, spray work done through notch, thereby eliminated the formation of eddy current to greatest extent; The another kind effect of big rotation inducer is the leaf groove outer rim equalization gas pressure density to the recoil turbine of high speed rotary motion, and this is that the gas pressure density of directly locating because of leaf groove outer rim of rotating at a high speed and root is different.

In sum, the utility model adopts secondary rotation inducer, recoil turbine, the reaction force work done that utilizes air-flow to spray, compressed-air actuated pressure potential is converted to the technical scheme of rotation function, the problems and shortcomings that energy conversion efficiency is low, body weighs greatly, rotating speed is difficult to improve of the vane type hand-hold grinder existence of prior art have been overcome, a kind of air impeller typed high-speed hand-hold grinder that is provided, improve rotating speed, the energy conversion efficiency of pneumatic hand-hold grinder, reached high speed, efficient, light small and exquisite purpose.

Description of drawings

Fig. 1 is the structural principle cutaway view of air impeller typed high-speed hand-hold grinder of the present utility model;

Fig. 2 is the outward appearance axonometric drawing of air impeller typed high-speed hand-hold grinder of the present utility model;

Fig. 3 is the movement assembly structure schematic diagram of air impeller typed high-speed hand-hold grinder of the present utility model;

Fig. 4 is the outward appearance axonometric drawing of Fig. 3;

Fig. 5 is that each parts of air impeller typed high-speed hand-hold grinder of the present utility model are surveyed schematic diagram along the axle that axis decomposes.

Below in conjunction with the embodiment in the accompanying drawing the utility model is described in further detail, but should not be construed as any restriction of the present utility model.

Among the figure: little rotation inducer 1, rotate inducer 2, recoil turbine 3, rotating shaft 4, air nozzle 5, rear bearing 01, stopcock shell 02, back cover 03, Spool assembly 04, shunting cover 07, grommet 08, wake flow awl 09, fore bearing 011, air flue shell 012, steam vent 013, copper mesh pad 014, fore shell 015 greatly.

The specific embodiment

Consult Fig. 1～Fig. 5, a kind of air impeller typed high-speed hand-hold grinder of the present utility model, comprise little rotation inducer 1, rotate inducer 2, recoil turbine 3, rotating shaft 4, air nozzle 5 greatly, wherein: described little rotation inducer 1 is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, leaf geosynclinal convex face direction is identical with recoil turbine 3, opposite with big rotation inducer 2, the wheel rim external diameter is identical with recoil turbine 3, and central shaft hole slides to rotate with rotating shaft 4 and cooperates; Described big rotation inducer 2 is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root footpath are identical with little rotation inducer 1, leaf geosynclinal convex face direction is opposite with recoil turbine 3 with little rotation inducer 1, the wheel rim external diameter is greater than little rotation inducer 1 and recoil turbine 3, and central shaft hole slides to rotate with rotating shaft 4 and cooperates; Described recoil turbine 3 is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root footpath are identical with little rotation inducer 1, and the wheel rim external diameter is identical with little rotation inducer 1, central shaft hole and rotating shaft 4 secure fit; Described rotating shaft 4 is the columniform stainless steel shaft spare of step, and the front end center is provided with awl mouthful blind hole, and the front step cylinder is provided with the clamping breach; Described air nozzle 5 is an aluminium alloy rounding post hollow step cover shape member, its outer big step cylinder is provided with radially symmetrical, accompany two skewed slots at oblique angle with axis, the root of skewed slot footpath is identical with little rotation inducer 1, and the oblique angle direction is identical with the tangential direction of the streamlined leaf groove of little rotation inducer 1.

Assembling (each parts mutual alignment and matching relationship)

The mutual alignment relation of each parts of movement assembly, front step end face to rear end by rotating shaft 4 is respectively, fore bearing 011, wake flow awl 09, recoil turbine 3, rotate that dress rear bearings 01 string is enclosed within the rotating shaft 4 in inducer 2, little rotation inducer 1 overcoat grommet 08, the air nozzle 5 greatly, wake flow awl 09 headfirst little; Rotating shaft 4 front ends of movement assembly forward, the whole air flue shell 012 that inserts, rotating shaft 4 front step pass the front aperture of air flue shell 012, copper mesh pad 014 pad is at the front end of air flue shell 012, the internal thread of fore shell 015 rear end is tightened on the external screw thread of air flue shell 012 front end, and copper mesh pad 014 is clipped between the two, and shunting cover 07 is against the rear end face of rear bearing 01, back cover 03 puts Spool assembly 04 and is tightened on the internal thread of air flue shell 012 rear end, and stopcock shell 02 is loaded onto in the rear end of back cover 03.

The relation of cooperatively interacting is respectively, fore bearing 011, wake flow awl 09, recoil turbine 3 and rotating shaft 4 stationary fits; Big rotation inducer 2, little rotation inducer 1 slide with rotating shaft 4 and are rotatably assorted; The outer rim and air flue shell 012 inwall of big rotation inducer 2, recoil turbine 3 are slidingly matched; The outer rim of the inwall of grommet 08 and little rotation inducer 1 is slidingly matched, outer wall and the 012 inwall stationary fit of air flue shell; The big step end of air nozzle 5 forward, step wall is enclosed within on the outer rim of rear bearing 01 rear bearing 01 centre bore and rotating shaft 4 stationary fits in the hollow of rear end; Air nozzle 5, little rotation inducer 1, the adjacent face that rotates inducer 2, recoil turbine 3 greatly are slidingly matched mutually.

Operation principle

During work, compressed air enters in the grinding machine along Spool assembly 04, through shunting cover 07, the skewed slot of air nozzle 5, the leaf groove of little rotation inducer 1, the leaf groove of big rotation inducer 2, the leaf groove of recoil turbine 3, wake flow is bored the steam vent 013 of air flue shell 012 front end of Room 09, copper mesh pad 014 is gone out outside the grinding machine forward, compressed air was in high pressure conditions before the wake flow that arrival is positioned at the grinding machine front portion is bored Room 09, pressure discharges rapidly when penetrating the leaf notch of recoil turbine 3, the leaf groove of recoil turbine 3 is under the effect of high velocity air reaction force, penetrate opposite direction rotation along air-flow, promptly, at recoil turbine 3 leaf groove jet places, the pressure potential of gas directly is converted to the rotation function of recoil turbine 3, thereby drive rotating shaft 4 rotation at a high speed, if ignore steam vent 013, some pressure dampings that copper mesh pad 014 produces, nearly all gas pressure potential energy all can be exchanged into energy of the impinging jet, Newton mechanics law as can be known, the opposite sign but equal magnitude of active force and reaction force, when unloaded, if ignore the frictional damping of recoil turbine 3 and rotating shaft 4, the linear velocity of turbine 3 circumference that recoil in theory rotations can equal the effluxvelocity of jet, and the power conversion of recoil turbine type that Here it is is better than impacting the principle of the power conversion of vane type.

In the work, rotation recoil turbine 3 can produce strong eddy current to the proal pressed gas of its inlet end one side at a high speed, promptly constitute the vortex barrier one in inlet end one side, the high speed rotation of the portion of energy retardance recoil turbine 3 of eddy current spent gas, and the fast more then retardance of the rotating speed of recoil turbine 3 is strong more, the whirlpool is decreased and is the index increase, reaches balance until recoil turbine 3 turnover gas two end pressure reduction and rotating speed, and rotating speed again method improves; Therefore, air nozzle 5 is set rotates the generation that inducer is eliminated eddy current with secondary, in the work, the rotation direction of little rotation inducer 1 is opposite with big rotation inducer 2, and identical with recoil turbine 3; When static, by little rotation inducer 1, rotate inducer 2 greatly, the gas channel that constitutes of recoil turbine 3 is crooked, in the time of dynamically, the leaf groove but is a straight line because of the synthetic air-flow particle dynamic channel of mutual reverse rotation shear, so, recoil turbine 3 is when high speed rotary motion, fairshaped leaf groove design and driven, the rotation inducer that rotation direction is opposite, with high-pressure flow gas with all assign near the mode of laminar flow and direct current the recoil turbine 3 each leaf groove, spray work done through notch, thereby eliminated the formation of eddy current to greatest extent; The another kind effect of big rotation inducer 2 is the leaf groove outer rim equalization gas pressure densities to the recoil turbine 3 of high speed rotary motion, and this is that the gas pressure density of directly locating because of leaf groove outer rim of rotating at a high speed and root is different.

Claims (3)

1, air impeller typed high-speed hand-hold grinder, comprise little rotation inducer (1), rotate inducer (2), recoil turbine (3), rotating shaft (4), air nozzle (5) greatly, it is characterized in that: described little rotation inducer (1) is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, leaf geosynclinal convex face direction is identical with recoil turbine (3), opposite with big rotation inducer (2), the wheel rim external diameter is identical with recoil turbine (3); Described big rotation inducer (2) is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root are directly identical with little rotation inducer (1), leaf geosynclinal convex face direction is opposite with recoil turbine (3) with little rotation inducer (1), and the wheel rim external diameter is greater than little rotation inducer (1) and recoil turbine (3); Described recoil turbine (3) is columniform aluminium alloy impeller, wheel rim is radial grade along circumference, and to be arranged with section be fairshaped leaf groove, the number of leaf groove, width and root are directly identical with little rotation inducer (1), and the wheel rim external diameter is identical with little rotation inducer (1); Described rotating shaft (4) is the columniform stainless steel shaft spare of step, and the front end center is provided with awl mouthful blind hole, and the front step cylinder is provided with the clamping breach; Described air nozzle (5) is an aluminium alloy rounding post hollow step cover shape member, its outer big step cylinder is provided with radially symmetrical, accompany two skewed slots at oblique angle with axis, the root footpath of skewed slot is identical with little rotation inducer (1), and the oblique angle direction is identical with the tangential direction of the streamlined leaf groove of little rotation inducer (1).

2, air impeller typed high-speed hand-hold grinder according to claim 1, it is characterized in that: described each parts mutual alignment is closed and is, the movement assembly is respectively by front step end face to the rear end of rotating shaft (4), fore bearing (011), wake flow awl (09), recoil turbine (3), rotate that dress rear bearing (01) string is enclosed within the rotating shaft (4) in inducer (2), little rotation inducer (1) overcoat grommet (08), the air nozzle (5) greatly, wake flow awl (09) headfirst little; The rotating shaft of movement assembly (4) front end forward, the whole air flue shell (012) that inserts, rotating shaft (4) front step passes the front aperture of air flue shell (012), copper mesh pad (014) pad is at the front end of air flue shell (012), the internal thread of fore shell (015) rear end is tightened on the external screw thread of air flue shell (012) front end, copper mesh pad (014) is clipped between the two, shunting cover (07) is against the rear end face of rear bearing (01), back cover (03) puts Spool assembly (04) and is tightened on the internal thread of air flue shell (012) rear end, and stopcock shell (02) is loaded onto in the rear end of back cover (03).

3, air impeller typed high-speed hand-hold grinder according to claim 1 is characterized in that: described each parts cooperatively interact to close and are, fore bearing (011), wake flow awl (09), recoil turbine (3) and rotating shaft (4) stationary fit; Big rotation inducer (2), little rotation inducer (1) slide with rotating shaft (4) and are rotatably assorted; The outer rim and air flue shell (012) inwall of big rotation inducer (2), recoil turbine (3) are slidingly matched; The outer rim of the inwall of grommet (08) and little rotation inducer (1) is slidingly matched, outer wall and air flue shell (012) inwall stationary fit; The big step end of air nozzle (5) forward, step wall is enclosed within on the outer rim of rear bearing (01) rear bearing (01) centre bore and rotating shaft (4) stationary fit in the hollow of rear end; Air nozzle (5), little rotation inducer (1), the adjacent face that rotates inducer (2), recoil turbine (3) greatly are slidingly matched mutually.

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