CN102245905A

CN102245905A - Impeller for a fan

Info

Publication number: CN102245905A
Application number: CN2009801493037A
Authority: CN
Inventors: R·安德烈科; A·法因瑙尔; M·马利希
Original assignee: BSH Bosch und Siemens Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2008-12-10
Filing date: 2009-11-16
Publication date: 2011-11-16
Also published as: WO2010066540A1; RU2011124742A; EP2376787A1; DE102008054497A1; US20110229341A1; JP2012511657A; KR20110089407A

Abstract

An impeller for a fan has a hub (1), in which a receptacle (8) for a shaft is formed, and a multiplicity of vanes (2) which are fastened to the hub (1). At least one elastic damping body (6) is provided on the hub (1) so as to be arranged between the receptacle (8) and the vanes (2).

Description

The impeller that is used for fan

Technical field

The present invention relates to a kind ofly be used for fan, for example be used for indoor fan or be used for the cooling of electrical equipment and/or the impeller of the built-in fans of air circulation.

Background technique

Particularly under the situation of miniature high-speed fan, the vibration of drive motor that is delivered to the impeller of fan can evoke the resonant frequency of impeller.This makes fan produce sizable operational noise, and in addition, vibration also can cause the fatigue of materials of impeller and make it through damaging after a while.

Summary of the invention

The purpose of this invention is to provide a kind of impeller that is used for fan, described impeller is insensitive to may vibrating of drive motor.

Under the situation of this blast fan, described impeller has: wheel hub, and the contained structure that is used for live axle is formed on wheel hub; And a plurality of blades, described vanes fixed is to wheel hub, and above-mentioned purpose realizes by following feature: wheel hub has at least one elastic buffer body that is arranged between contained structure and the blade.

In order to weaken the vibration transfer from the axle to the blade and to prevent that as much as possible blade from vibrating relative to each other, blade preferably is fixed to the wheel hub outer shroud, and described wheel hub outer shroud is connected to part in the wheel hub with contained structure via buffer body.

According to first certain embodiments, buffer body can occupy outer shroud and the annular intermediate space between inner the branch.

Alternatively, also can in outer shroud and the annular intermediate space between inner the branch a plurality of buffer bodies be set, described a plurality of buffer bodies circumferentially.

Buffer body preferably is made of the material different with outer shroud and/or interior part, particularly constitutes by having high flexible material.Especially, this material can be silicone or rubber.

Yet, also can expect such an embodiment, wherein, a plurality of circumferential buffer bodies and outer shroud and interior part are implemented integratedly.In this case, the required elasticity of buffer body can realize by described buffer body is had than outer shroud or the little wall thickness of interior part.

If buffer body is not implemented integratedly with ring or interior part, ring and/or interior part advantageously have recess, are bonded in the described recess to the buffer body form fit, make ring and interior part not to rotate in opposite direction.

Keep securely in order to ensure buffer body, recess can be by undercutting.

Interior part preferably includes cylindrical central sleeve and annular wall, and described cylindrical central sleeve forms contained structure, and described annular wall and sleeve are turned up the soil at interval and extended around sleeve.Therefore, can be imported into around the annular spring of the sleeve in crack with seam, so that impeller is fixed on the axle.

Cylindrical central sleeve and annular wall can link into an integrated entity, and make to simplify.

The link that cylindrical central sleeve is connected to annular wall preferably is arranged on the end of wheel hub.Therefore, can form axially extended intermediate space between cylindrical central sleeve and annular wall, wherein, described space can hold the spring that extends axially that is used for wheel hub is fixed to axle suitably.

According to an optional embodiment, annular spring also can be around interior part, and at least one buffer body with respect to spring axial dipole field be arranged in outer shroud and the annular intermediate space between inner the branch.

Impeller is preferably used for being arranged on home appliances for example in the fan in the refrigerating appliance.Thereby, can be when fan operation, particularly prevent that in the stage of resting of compressor generation from making us unhappy noise level.

Description of drawings

Below, by describing exemplary embodiment referring to accompanying drawing, with obvious further feature and advantage of the present invention, accompanying drawing comprises:

Fig. 1 shows the perspective cut-away schematic view according to impeller of the present invention;

Fig. 2 shows the radial cross section of the wheel hub of the impeller by according to a second embodiment of the present invention;

Fig. 3 show according to the 3rd embodiment with the similar cross section of Fig. 2;

Fig. 4 show according to the 4th embodiment with the similar cross section of Fig. 2; And

Fig. 5 shows the perspective cut-away schematic view according to the 5th embodiment's impeller.

Embodiment

Impeller shown in Fig. 1 has the wheel hub 1 of substantial cylindrical, stretches out a plurality of blades 2 from the periphery of described wheel hub.The number of blade obviously can be arbitrarily, for example comprises four blades 2 in the example shown in this, only can see wherein two blades 2 among the figure.These blades 2 link into an integrated entity with the outer shroud 3 of wheel hub 1.A plurality of silicone buffer bodies 6 equally spaced are arranged in the outer shroud 3 and the toroidal cavity 4 between the interior part 5 of wheel hub 1 in a circumferential direction, and described interior part 5 is arranged in the described outer shroud 3.In four buffer bodies herein, can see three among the figure, wherein two buffer bodies are dissectd.Buffer body 6 is the unique power junctions between outer shroud 3 and the interior part 5.

Interior part 5 comprise annular wall 7 and by the annular wall concentric ring around sleeve 8, sleeve 8 opens wide towards the direction of the outlying observation person's of wheel hub 1 end face, to hold the axle (not shown) of drive motor.Pass through sleeve 8 towards slit 9 horizontal expansions that the end face towards the observer opens wide.The wall 10 by radial directed links into an integrated entity in observer's dorsad end for annular wall 7 and sleeve 8.Wall 10, annular wall 7 and sleeve 8 correspondingly form bottom and two sidewalls of annular groove 11 respectively, and described annular groove 11 direction towards observer's end face of part 5 inwardly opens wide, with the annular tension spring 12 in accommodating belt slit.Because two halfbodies of sleeve 8 are pressed together by tension spring 12, therefore, can press fit be to live axle reliably with impeller, described live axle is contained in the sleeve 8.

Any unbalanced (in the motion of axle) cushions by means of buffer body 6 to the transmission of outer shroud 3 or blade 2.Because 6 pairs of annular wall 7 of buffer body and interior part 5 any motion have relative to each other produced buffering, so they also can suppress the generation of blade 2 resonance.

Elasticity and buffering ability according to buffer body 6, can increase their number or their circumferential yardstick effectively, up to reaching the extreme case shown in Fig. 2 (Fig. 2 is the cross section along line II shown in Figure 1 is done), in this case, cavity 4 is occupied by single loop buffer body 6 fully.

In the embodiment shown in Fig. 1 and 2, the friction between buffer body 6 and outer shroud 3 or the interior part 5 has stoped basically and has encircled the 3 any lasting rotations with respect to interior part 5.For this reason, buffer body 6 need compress the required pressure of ring 3 and interior part 5 in all constantly equal resiliently deformables with formation.This is provable to be problematic, if particularly fan exposes (for example, when be used for circulate cold air in the family expenses refrigerating appliance) at low temperatures, this is because many elasticity that are suitable for the rubber-elastic material of buffer body 6 can obviously reduce at low temperatures.The different thermal expansion coefficient of selected material also can make buffer body 6 and the ring 3 and/or interior part 5 between friction with the temperature significant change.

In order to obtain buffering elasticity under the situation of the coupling of rotating no matter how temperature all can resist in generation between outer shroud 3 and the interior part 5, another improved embodiment is provided, wherein, be provided with recess on the apparent surface of interior part 5 and ring 3, buffer body 6 is bonded in the described recess.If as with the similar Fig. 3 of Fig. 2 in the cross section shown in, being bonded in the undercut portions of

recess

13,14 by undercutting and on this buffer body 6 form fit ground with H shape cross section with the recesses of

reference character

13 and 14 expressions respectively on outer shroud 3 and the interior part 5 realized that then buffer body fixes especially reliably.In this embodiment, under state of equilibrium, buffer body 6 does not need pre-tensioning, and therefore, buffer body 6 can be yielded to the torque that acts between ring 3 and the interior part 5 a little.Buffer body 6 surrenders are severe more, and the resonant frequency of ring 3 and interior part 5 any rotational shear relative to each other is just low more.By this resonant frequency being chosen to make it sufficiently depart from any frequency component of motor movement, the ring 3 rotational shear effects with respect to interior part 5 can be prevented from effectively or be attenuated to noise and produce incoherent level.

Fig. 4 shows a kind of modification of simplification.In this case, the buffer body 6 of making and being fixed on the ring 3 and/or the wall of interior part 5 by silicone is replaced by narrow bridge part 15, described bridge part is molded and shaped integratedly with ring 3 and interior part 5, and its elasticity comes from them and compares with interior part 5 with outer shroud 3 and have obviously thinner wall thickness.

Fig. 5 is to show the embodiment of another simplification with view like the view of Fig. 1.In this embodiment, the annular wall 7 of the foregoing description is removed, and the sleeve 8 in crack with seam wheel hub 1 towards motor the axle the end be integrally connected to outer shroud 3 (this outer shroud 3 is carrying blade 2) via radial wall 16.The thickness of wall 16 is significantly less than the thickness of the wall 10 in the previous embodiment; This make outer shroud 3 can along with the axis of the rotation axis horizontal expansion of wheel hub 1 with respect to sleeve 8 vibrations.Simultaneously, any this vibration all can obviously be cushioned by the loop buffer body 17 that is extruded in the annular groove 18 between sleeve 8 and the ring 3.

As referring to as described in 1, tension spring 12 is axially shifted onto on the sleeve 8, is contained in axle in the sleeve 8 with clamping.Also can save tension spring 12 and only apply the required pressure of clamp axis to sleeve 8 by means of the buffer body 17 that is squeezed into.

Claims

1. the impeller of a fan that is used for fan, uses especially for home appliances, described impeller comprises: wheel hub (1), the contained structure (8) that is used for axle is formed on wheel hub (1); And a plurality of blades (2), described vanes fixed is characterized in that to wheel hub (1) wheel hub (1) has at least one elastic buffer body (6,15) that is arranged between contained structure (8) and the blade (2).

2. impeller as claimed in claim 1 is characterized in that, blade (2) is fixed to the outer shroud (3) of wheel hub (1), and described outer shroud (3) is connected to the interior part (5) of described wheel hub via buffer body (6,15), described in part (5) have contained structure (8).

3. impeller as claimed in claim 2 is characterized in that, buffer body (6) occupies the annular intermediate space (4) between outer shroud (3) and the interior part (5).

4. impeller as claimed in claim 2 is characterized in that, a plurality of buffer bodies (6,15) are arranged in the annular intermediate space (4) between outer shroud (3) and the interior part (5) in the mode of circle distribution.

5. impeller as claimed in claim 4 is characterized in that, ring (3) and/or interior part (5) have recess (13,14), are bonded in the described recess to buffer body (6) form fit.

6. impeller as claimed in claim 5 is characterized in that, recess (13,14) is by undercutting.

7. as arbitrary described impeller among the claim 2-6, it is characterized in that compare with outer shroud (3) and/or interior part (5), buffer body (6) constitutes by having more elastomeric material.

8. impeller as claimed in claim 7 is characterized in that, the material of buffer body (6) is silicone or rubber.

9. impeller as claimed in claim 4 is characterized in that, buffer body (15) is implemented integratedly with outer shroud (3) and interior part (5).

10. as arbitrary described impeller among the claim 2-9, it is characterized in that interior part (5) comprises cylindrical central sleeve (8) that forms contained structure and the annular wall of turning up the soil and extending around sleeve (8) at interval with sleeve (8).

11. impeller as claimed in claim 10 is characterized in that, annular spring (12) is around the sleeve (8) in crack with seam.

12., it is characterized in that cylindrical central sleeve (8) and annular wall (7) link into an integrated entity as claim 10 or 11 described impellers.

13., it is characterized in that the link (10,16) that cylindrical central sleeve (8) is connected to annular wall (3) is arranged on the end of wheel hub (1) as arbitrary described impeller among the claim 10-12.

14. as arbitrary described impeller among the claim 1-13, it is characterized in that, annular spring (12) is around interior part (5), and at least one buffer body (17) with respect to spring (12) axial dipole field be arranged in the annular intermediate space between outer shroud (3) and the interior part (5).

15. a fan is characterized in that, described fan has arbitrary described impeller among the claim 1-14.