CN1966990B

CN1966990B - Running wheel for suction machine

Info

Publication number: CN1966990B
Application number: CN2006101514027A
Authority: CN
Inventors: E·农嫩马赫
Original assignee: DUHR DENTAL INSTRUMENTS KG
Current assignee: DUHR DENTAL INSTRUMENTS KG; Duerr Dental SE
Priority date: 2005-09-05
Filing date: 2006-09-05
Publication date: 2010-05-19
Anticipated expiration: 2026-09-05
Also published as: CN1966990A; JP2007071204A; ITMI20061683A1; DE102005042227A1

Abstract

The invention relates to an impeller 28 for a side channel sucking machine including a hub component 42 which can be coupled with a drive shaft. A guide ring 50 manufactured out of plastic is formed and attached to the hub component 42 manufactured out of metal. Many blades 72 distributed in a circumference direction are attached on the same.

Description

The active wheel that is used for sucking machine

Technical field

The present invention relates to a kind of active wheel that is used for sucking machine, this active wheel has a hub portion that can be connected with a live axle and a wheel rim by this hub portion supporting, and this wheel rim is equipped with blade.

Background technique

The working principle of side canal sucking machine can for example obtain from DE 4128150A1.The channel (Tasche) of the active wheel that defines by blade with along the common feedway that is used for gaseous medium that forms of the passage of the flow blower casing of extending circumferentially, by this feedway, gaseous medium is delivered to outlet with spiral vortex motion from the inlet of sucking machine.The active wheel of this sucking machine rotates with high rotating speed (in the practice being 3000 rev/mins).Therefore, active wheel is balance well, and in addition, active wheel must be with little seal clearance operation in housing.

The active wheel of the side canal machine of describing in DE 4128150A1 is a cast member, and it is processed with high-accuracy mechanical.This class cast member is heavier, therefore may produce big imbalance, and this must eliminate by removing material.This imbalance causes high cost and needs some times.

Also considered the active wheel of the die casting made of plastics afterwards.But, can give like this and on axle, fixedly cause difficulty.

Summary of the invention

Therefore, by the present invention, provide an active wheel that is used for sucking machine, it only needs the balance of a little, and can be contained on the axle reliably.

According to the present invention, realized by the active wheel of plastics manufacturing by the metal manufacturing by wheel rim by hub portion wherein for this purpose.

In according to active wheel of the present invention, hub portion is made with metal.This metal wheel-hub can be reliably and not tiredly is not born big power.Because the intensity and the toughness of material can be designed to hub portion thin dish type.Like this, just allow it with there being the sheet metal of corresponding thickness to cut out or go out.Because the good homogeneous of the thickness of the sheet material that on market, obtains of this class, so the unreliability when materials processing still only is the dimensional accuracy of the edge contour that coils.But this dimensional accuracy can guarantee with simple manufacturing method.

Thus, in according to active wheel of the present invention, hub portion does not farthest have imbalance and has only little quality, and this is being favourable aspect high-speed starting of active wheel.

And make with plastics by the wheel rim of hub portion supporting.Thus, obtain various molded surfaces high quality of fit geometrical shape and do not need the advantage of machine finish.Wheel rim can be connected with hub portion reliably along big area, so that can not have problems from the power transmission and the torque transmission of hub portion to wheel rim.

Compare with a whole active wheel, obviously reduce, but also less than the pure active wheel made from plastics, this is because saved plastics according to the manufacturing expense of active wheel of the present invention with the metal manufacturing.In addition, according to active wheel of the present invention the good machinery/mechanical property made from plastics than whole of active wheel is arranged.

By hub portion is designed to dish type, allow to make hub portion lopsidedly with high dimensional accuracy and nothing by simple process step.

Be fastened on especially reliably aspect the hub portion at wheel rim, make that to have the aperture that a plurality of edges circumferentially distribute in the fringe region of hub portion in being embedded in plastics be favourable, this is because when integrally formed, parts of plastics ground expands and passes the edge of hub portion.

According to a kind of improvement project of the present invention, the bearing ring of wheel rim is provided with at least one group along the depression position that circumferentially distributes.Preferably, bearing ring has a plurality of along its circumferential size and/or along the different concentric depressed part hyte of its size radially.

More preferably, innermost depressed part hyte has the radial dimension and the minimum circumferential size of the maximum at depression position.Middle depressed part hyte has the circumferential size and the minimum radial dimension of the maximum at depression position.In outmost depressed part hyte, the circumferential size at depression position is greater than the circumferential size of innermost depressed part hyte with less than the circumferential size of the depressed part hyte of centre, and has one less than the radial dimension of innermost depressed part hyte with greater than the radial dimension of the radial dimension of the depressed part hyte of centre.

Different depressed part hytes can be arranged in different planes.Preferably, middle depressed part hyte is arranged in the ring segment of the maximal axial extension with all ring segments, depressed part hyte outside is arranged in the ring segment with less axial dimension, and innermost depressed part hyte then is arranged in the ring segment with minimum axial direction size.

Preferably, outmost depressed part hyte has the maximum degree of depth.

More than improving the end face help active wheel has good and sealing reliably with respect to the relative sealing surfaces that is fixed on the housing of machine.The different depression position of active wheel produces leaking the little vortex that road forms dynamic latch-up passing by when being fixed on sealing surfaces on the housing.

By the dynamic seal (packing) position that so obtains, allow when the active wheel wheel rim moulding of making of plastics, need not append significant additional cost.

According to a kind of improvement project of the present invention, blade has a section of foundation of radially extending and to incline curved outer wing section with respect to section of foundation.Preferably, the bent angle that inclines of outer wing section relative section of foundation is about 10 °.This is being favourable aspect high efficiency of active wheel.

In the active wheel of the section of foundation of blade by annular flange flange connection, the distortionless shifting ground of blade is supported therein.This is favourable for being avoided causing the vibration of unwished-for noise interference.

Aspect the mobile performance of the satisfaction in the channel between blade of active wheel, it is favourable making annular flange flange that one zigzag edge contour shape be arranged.Preferably, the incline of serrate profile section is made recessed song.More preferably, the incline of serrate profile section is made the shape of circular arc.

Aspect the raising once more of wheel rim rigidity, it is favourable that annular flange flange section between blade is connected with bearing ring by at least one strengthening rib separately.

At this moment, consider the mobile performance of the satisfaction in the channel between blade of material economy and active wheel, then make strengthening rib have along circumferentially look for leg-of-mutton edge contour shape be favourable.

Aspect the mobile performance of the symmetry in the working space of sucking machine, it is favourable making hub portion and wheel rim all be symmetrical in a midplane.

Description of drawings

According to an embodiment the present invention is described below with reference to accompanying drawing.Among the figure:

Fig. 1 illustrates the axial section of a side canal sucking machine;

Fig. 2 illustrates the axial of amplification of the active wheel of sucking machine shown in Figure 1;

Fig. 3 illustrates the axial section of the active wheel shown in Fig. 2; And

Fig. 4 illustrates along the sectional plane of the amplification of the B-B hatching of Fig. 2.

Embodiment

Fig. 1 illustrates one and has whole side canal sucking machine with 10 housings of representing.This housing comprises that one is divided into two basic and be the shell part 12 of columniform centre, and described middle case partly connects together with lower casing part 14 usefulness bolts that supported by pin 16.

A slot part that aligns 20 defines a working space 24 jointly in the thickening ground formation and limit a slot part 18 gradually of the upper end of middle shell part 12, described slot part and upper casing part 22.This working space has the cross section that increases along circumferentially, and is symmetrical in a midplane 26.

Have an integral body to rotate with 28 active wheels of representing in working space 24, this active wheel is connected with the end of motor shaft 32 securely by screw 30, and this belongs to the whole motor of representing with reference symbol 34.Motor shaft 32 is bearing on the

bearing

36,38 that is supported by motor casing 40.

The inlet of working space 24 it is contemplated that to feed working space in the front of figure paper plane in Fig. 1.The outlet of working space it is contemplated that to lead to working space in the back of figure paper plane in Fig. 1.The figure paper plane of Fig. 1 passes the sealing

web

35,37 of

shell part

12 and 22 and arranges, sealing

web

35,37 is with the end face co-operation of a seal clearance and active wheel 28, and prevent to enter the mouth with export between be connected.

Describe active wheel in greater detail referring to figs. 1 to 3 below now.

Active wheel 28 has a hub portion 42 placed in the middle, and it has a through hole 44 placed in the middle, that be used to admit screw 30.

The fringe region 46 of crown wheel hub portion 42 is embedded in the wheel rim 48 of the type that is molded from plastic into that a whole usefulness 48 represents.

Wheel rim 48 comprises that one is designed to the bearing ring 50 of ladder annular and whole with 56 that represent, as to stretch into working space 24 blade ring, and this bearing ring moves between two end faces 52,54 respect to one another of the shell part 12 of centre and upper casing part 22 with a seal clearance.

As from what Fig. 1 to 3 found out, the intermediate annular section 60 and that bearing ring 50 has an innermost ring segment 58, with an axial dimension a1 to have axial dimension a2 has the outmost ring segment 62 of axial dimension a3.Axial dimension can be understood that the distance each other of two flat end faces separately of different ring segment herein.

As being clear that from Fig. 2 and 3 especially,

depression position

64,66,68 falls in from the flat end face inside vertically direction of

ring segment

58,60,62.For different sections, the difference at these depression positions is its circumferentially stretching, extension, its circumferentially extending/radial length and degree of depth thereof.

Detailed proportionate relationship is as follows:

There is the circumferentially extending of minimum circumferential stretching, extension (7.2 °), maximum at the depression position 64 of innermost ring segment 58 and is in a ratio of the little degree of depth with a1.Axial dimension a1 also is the minimum in all ring segments.

There are maximum circumferentially stretch (18 °) of all depressed part hytes at the depression position 66 of intermediate annular section 60.It has the identical degree of depth in basic and depression position 64, and the smallest radial stretching, extension of all depressed part positions is arranged.But the axial dimension a2 of intermediate annular section 60 is maximum in all ring segments.

The axial dimension a3 of outmost ring segment 62 is slightly less than the axial dimension a2 of intermediate annular section 60.But there is the maximum depth of all depressed part positions at the depression position 68 of outmost ring segment 62, promptly greater than 65% of a3.

Housing parts

12 and 22

end face

52,54 radially in the scope of bearing ring 50, make stair-stepping, with with the flat end face complementation of

ring segment

58,60,62, make between the region aligned of the end face of bearing ring 50 and

end face

52,54 and obtain a very little uniform seal clearance.Different depression positions forms a dynamic seal (packing) of blocking the vacuum leak path respectively together with relative portion's section of

end face

52,54.

As can be seen from Figure 3 hub portion 42 is provided with circular aperture 70 in it is embedded in fringe region in the bearing ring 50 as special, and the plastic materials of bearing ring 50 will move through this aperture when (one) is formed on the hub portion 42.Like this, just obtain being connected along circumferentially having the shape of bearing capacity to lock with the power of radially effect at the aperture place.Because the quantity of aperture 70 big (being 20 in an illustrated embodiment), and in addition also because plastics have good adhesion on the end face of hub portion 42, so reliable power transmission and transmission of torque are arranged between hub portion 42 and bearing ring 50, thereby also can quicken fast reliably and braking process.

Blade ring 56 comprises a plurality of blades 72 along extending circumferentially.As seen from the figure, these blades each have a section of foundation 74 of radially extending exactly and and incline curved about 10 ° outer wing section 76 with respect to section of foundation.In an illustrated embodiment, outer wing section 76 radially extended length is about the twice of the circumferentially extending of section of foundation 74.

That section of foundation 74 is shaped by an one, connect perpendicular to the annular flange flange 78 of spin axis.Its edge contour shape is made zigzag by the cycle corresponding with the pitch of blade 72, wherein, the incline 80 of each annular flange flange section between two blades 72 successively has the shape of a round part.This is being favourable aspect good flow condition of the channel of the active wheel between blade 72 28.

Annular flange flange section between blade 72 successively is connected with the peripheral surface of ring segment 62 by two isolated triangle strengthening rib 82 separately.In this way, active wheel 28 integral body have high machinery/mechanical stability and are not easy to vibration.

As seen from the figure, active wheel 28 integral body are symmetrical in a midplane 84, and this plane overlaps with the midplane 26 of working space 24 in mounted active wheel.

The setting of two other eccentric circular port 86 of hub portion 42 is support tools of accepting torque in order to place, to be used to mount and dismount active wheel.

As shown in the partial enlarged drawing of Fig. 4, the edge of single blade 72 as shown in 88, falls one 45 ° angle.

In the embodiment of a reality of active wheel 28, as what use in a suction in dental applications machine, the external diameter of active wheel is 213mm, and the external diameter of hub portion is 122mm.

The axial dimension of blade ring 56 is 32mm, and the thickness of crown wheel hub portion is about 3.5mm.

Hub portion 42 cuts out from the plate (steel plate or Al alloy sheets) that respective thickness is arranged.The plastics wheel rim of die casting is made up of glass fiber reinforced plastic, particularly is made up of the plastics of known Grivory TPA by name.

Claims

1. the active wheel that is used for sucking machine, have a hub portion (42) that can be connected with a live axle (32) and a wheel rim (48) by this hub portion supporting, this wheel rim is equipped with blade (72), it is characterized by, described hub portion (42) is by the metal manufacturing, and wheel rim (48) is then made with plastics.

2. active wheel as claimed in claim 1 is characterized by, and described hub portion (42) is designed to dish type.

3. as the active wheel of claim 1 or 2, it is characterized by the aperture (70) that has a plurality of edges circumferentially to distribute in the fringe region of hub portion (42) in being embedded in plastics.

4. active wheel as claimed in claim 1 is characterized by, and the bearing ring (50) of wheel rim (48) is provided with at least one along the depressed part hyte (64,66,68) that circumferentially distributes.

5. active wheel as claimed in claim 4 is characterized by, and bearing ring (50) has a plurality of along its circumferential stretching, extension and/or along the different concentric depressed part hyte (64,66,68) of its stretching, extension radially.

6. active wheel as claimed in claim 5 is characterized by, and innermost depressed part hyte (64) has the circumferentially extending and the minimum circumferential stretching, extension of the maximum at depression position.

7. as the active wheel of claim 5 or 6, it is characterized by, middle depressed part hyte (66) has the circumferential stretching, extension and the minimum circumferentially extending of the maximum at depression position.

8. active wheel as claimed in claim 6, it is characterized by, middle depressed part hyte (66) has the circumferential stretching, extension and the minimum circumferentially extending of the maximum at depression position, the circumferential stretching, extension of outmost depressed part hyte (68) is greater than the circumferential stretching, extension of innermost depressed part hyte (64) and less than the circumferential stretching, extension of the depressed part hyte (66) of centre, and the circumferentially extending of outmost depressed part hyte (68) is less than the circumferentially extending of innermost depressed part hyte (64) and greater than the circumferentially extending of the depressed part hyte (66) of centre.

9. as the active wheel of one of claim 4 to 6, it is characterized by, different depressed part hyte (64,66,68) is arranged in different planes.

10. active wheel as claimed in claim 9, it is characterized by, middle depressed part hyte (66) is arranged in have all ring segments ring segment of maximal axial extension (a2) of (58,60,62), outmost depressed part hyte is arranged in the ring segment (62) with less axial dimension, and innermost depressed part hyte then is arranged in the ring segment (60) with minimum axial direction size (a1).

11. the active wheel as one of claim 4 to 6 is characterized by, outmost depressed part hyte (68) has the maximum degree of depth.

12. active wheel as claimed in claim 1 is characterized by, blade (72) has a section of foundation (74) of radially extending and with respect to section of foundation incline curved outer wing section (76).

13. the active wheel as claim 12 is characterized by, outer wing section (76) bent angle that inclines of section of foundation (74) relatively are about 10 °.

14. the active wheel as claim 12 is characterized by, the section of foundation (74) of blade (72) connects by an annular flange flange (78).

15. the active wheel as claim 14 is characterized by, annular flange flange (78) has a zigzag edge contour shape.

16. the active wheel as claim 15 is characterized by, the incline of described zigzag edge contour (80) is made recessed song.

17. the active wheel as claim 16 is characterized by, the incline of described zigzag edge contour (80) is made the shape of circular arc.

18. the active wheel as one of claim 14 to 16 is characterized by, the described annular flange flange that is positioned between the blade (72) is connected with bearing ring (50) by at least one strengthening rib (82) separately.

19. the active wheel as claim 18 is characterized by, strengthening rib (82) has along circumferentially looking and is leg-of-mutton edge contour shape.

20. the active wheel as claim 1 or 2 is characterized by, hub portion (42) all is symmetrical in a midplane (84) with wheel rim (48).