CN1123050A

CN1123050A - Radial impeller

Info

Publication number: CN1123050A
Application number: CN95190061.7A
Authority: CN
Inventors: 马塞厄斯·瓦恩霍斯特; 卡西林·博麦; 格哈特·乌尔里克; 彼得·皮则拉
Original assignee: Vorwerk and Co Interholding GmbH
Current assignee: Vorwerk and Co Interholding GmbH
Priority date: 1994-02-03
Filing date: 1995-01-11
Publication date: 1996-05-22
Anticipated expiration: 2015-01-11
Also published as: EP0692076B1; SK280010B6; CN1076447C; SK120495A3; PL175646B1; NO953829D0; WO1995021330A1; AU1455795A; DE4403224A1; MY111675A; EP0692076A1; JP3490089B2; ES2118556T3; SI0692076T1; CA2159803A1; LV12170A; CZ242395A3; ATE167917T1; DK0692076T3; CZ285753B6

Abstract

The invention relates to a radial impeller (1), preferably on an electric motor (10), especially an electric vacuum cleaner motor, with an impeller disc (8) on which are fitted preferably curved blades (2) with an outer curve (3) and an inner curve (4). Through apertures (6) are provided in the impeller disc (8). To reduce noise, the invention proposes that the through apertures (6) allocated to a blade (2) be formed on the outer curve (3).

Description

Radial impeller

The present invention relates to the radial impeller on a kind of motor that preferably is installed in motor, especially a vacuum cleaner, it has a draught fan impeller dish, wherein be provided with blade preferably bending extension, that have a curved outer and a curved interior face, in the draught fan impeller dish, be provided with through hole.

This radial impeller for example DE-OS 25 50 481 is well-known.In this known radial impeller, by means of the charging efficiency of improving centrifugal blower near the hole at center.Also can wherein in the draught fan impeller dish, be provided with through hole at center equally in addition referring to DE-PS 24 18 826 near centrifugal blower.In this known radial impeller, equally also be to attempt to improve power by means of the hole.

This radial impeller, especially those specific questions that are installed in the radial impeller in domestic appliance such as the vacuum cleaner are, owing to flow velocity produces tangible noise.Purpose of the present invention just is this is provided remedial measure.

Above-mentioned purpose is solved by the content in the claim 1, and wherein proposing is the side that the through hole of a blade arrangement is arranged on its curved outside.In general, through hole is arranged on blade on the pressure side.When on a radius, in case of necessity also along on the mid point of radial impeller and a deflection curve between the circumference, a plurality of through holes being set, that is they further are complementary with impeller and this moment when especially being arranged on the pressure side, show surprisingly and can reduce noise significantly.This noise reduces with the physical dimension that increases centrifugal blower or to radial impeller takes expensive measure at all irrelevant.In fact it can be used on each existing blower fan structure, show that in various tests sound pressure level significantly reduces,, also can optimize rotating speed and each single structure of radial impeller by the number and the distribution of selecting hole.The result who obtains in the common radial impeller on a motor that is installed in the vacuum cleaner is that noise obviously reduces when rotating speed is 200～350 rev/mins of scopes.Specifically, the generation of this effect is because described through hole is arranged, make the tongue limit of draught fan impeller dish that is the impeller plate radially the pressure surge at the position of outermost reduce, thereby more even in the velocity distribution at the place, tongue limit of impeller.According to the present invention, the position that the hole is arranged near the center is unessential, is that through hole is arranged on the pressure area that is positioned at blade near blade in fact, that is at a side place of curved outer.What be even more important also is, a plurality of through holes of blade arrangement.These through holes are preferably distributing on a blade total length that radially extends basically.On the whole, another significant aspect is the cross section in hole, and promptly the hole is with respect to the basal plane of draught fan impeller dish, also shared with respect to its projection plane in case of necessity cross section size.This is preferably 0.01～10% of the described area of the impeller plate by the shared area of through hole.When better is that 0.1～5% described area of contour especially has meaning for radial impeller, and at this moment, the draught fan impeller dish is not flat, but crooked.For single Kong Eryan, can also stipulate further that the axis in this hole is an acute angle ground stretching, extension with respect to an extended surface of draught fan impeller dish.Make through hole thus this extends certain length in impeller plate wall.In addition, also can reach desired suction performance thus.Further advantageously, a through hole has the cross section of an increase, and for example, through hole can be a funnel-shaped structure, and in detail, the big cross section of through hole is preferably disposed on blade-side.The outward appearance of through hole basal plane itself is preferably done circular in suitable mode.But also dihedral and oval basal plane.In this, more favourable way is to follow the processing possibility.

Below in conjunction with an embodiment shown in the accompanying drawing the present invention is described.In the accompanying drawing:

Fig. 1 is a rear view of impeller;

Fig. 2 is a side view of impeller shown in Figure 1;

Fig. 3 is a front elevation of impeller shown in Figure 1;

Fig. 4 is a three-dimensional view of impeller shown in Fig. 1 to 3;

Fig. 5 is that impeller shown in Fig. 1 to 4 is installed in a view in the vacuum cleaner shown in the part.

At first describe with reference to the impeller that has blade 21 shown in Figure 1.These blades 2 radially are bending extensions along it.Blade 2 has curved outer 3 and curved interior face 4, curved outer 3 one sides near or be provided with many through holes 6 adjacent to blade root line 5 places of blade 2, these through holes 6 are along with the bending direction of blade is arranged.By seeing among the figure, these through holes 6 have certain radial spacing a apart from the rotating shaft A (also referring to Fig. 2) of impeller 1 during beginning, the size of this spacing a is approximately half of radius R of impeller in the present embodiment, is preferably in 1/4～2/3 the scope of radius R.

Especially shown in the three-dimensional view among Fig. 4, shown impeller 1 is a kind of vane rotor with a center hub 7, expands to described wheel hub 7 about tapers draught fan impeller dish 8.In this embodiment, be arranged in the position that radially the most inboard through hole 6 is arranged on the root line 9 of wheel hub 7.

In detail, in the present embodiment, curved outer one side of each blade 2 is provided with four through holes 6.

From the view of Fig. 3, also can obtain identical situation.

In the view of Fig. 5, such radial impeller 1 is installed in the vacuum cleaner shown in the part.Especially be provided with motor 10 (do not do in more detail and illustrate) in this vacuum cleaner, this motor 10 is through axle 10 ' driving radial impeller 1.By means of impeller 1, air is inhaled into along the arrow P direction, then by radially shunting along arrow P ₁Direction deflection, the suction air that contains dust is continued to be directed in the dust collection bag that is contained in motor 10 back, and this paper is not shown specifically this bag.

Invention disclosed feature in the above description and in accompanying drawing and claims is no matter be independent or its combination in any, for realizing that the present invention is important.All disclosed features all are essence of the present invention places.Under in disclosed application, also comprising fully/all disclosures of appended priority text (copy of preceding application).

Claims

1, radial impeller (1), preferably be contained on the motor (10), especially be contained on the motor of dust collector, comprise a draught fan impeller dish (8), has the preferably blade (2) that comprises a curved outer (3) and a curved interior face (4) of bending extension on it, in draught fan impeller dish (8), be provided with through hole (6), it is characterized in that, be arranged on its curved outer (3) side with the through hole (6) of each blade (2) phase configuration.

2, by the described radial impeller of claim 1, it is characterized in that a blade (2) is furnished with a plurality of through holes (6).

3, by one or more the described radial impeller in the aforesaid right requirement, it is characterized in that, through hole (6) is distributed on the whole length of blade (2) basically, but be preferably in the length range of a radially inner side of blade (2) through hole (6) is not set.

4, by one or more the described radial impeller in the aforesaid right requirement, it is characterized in that, through hole (6) account for draught fan impeller dish (8) area of contour 0.01～10%, be preferably 0.1～5%.

By one or more the described radial impeller in the aforesaid right requirement, it is characterized in that 5, through-bore axis is an acute angle ground with respect to an extended surface of draught fan impeller dish (8) and stretches.

By one or more the described radial impeller in the aforesaid right requirement, it is characterized in that 6, a through hole (6) has the cross-section area of expansion.

By one or more the described radial impeller in the aforesaid right requirement, it is characterized in that 7, the bigger cross section of a through hole (6) is arranged on blade-side.