Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Patent
1998-09-08
2000-08-01
Moore, Chris K.
Brushing, scrubbing, and general cleaning
Machines
With air blast or suction
96382, 181231, 417312, A47L 900
Patent
active
060947748
DESCRIPTION:
BRIEF SUMMARY
FIELD OF INVENTION
The present invention relates to a suction cleaner of the type described in the introductory part of claim 1, comprising a motor which operates a blower in such a manner that the blower blows a flow of air out into a motor chamber that delimits a volume which extends at least radially around the motor, and subsequently out through outflow openings arranged in the motor chamber, and wherein a silencer element is provided in the motor chamber, made of a silencing material that encloses the motor radially and forms a silencing chamber around the same, and wherein the silencer element is provided with flow passages which constitute the flow connection from said silencing chamber to the outflow openings in the motor chamber.
BACKGROUND OF INVENTION
DE 34 02 603 A1 teaches such suction cleaner in the form of a vacuum cleaner wherein a jacket of a sound absorbing foam material is provided around the motor, wherein flow openings are provided that extend radially sideways relative to the motor. Therefore the outside of the silencing jacket is provided with flow passages that extend along the inside of the motor housing and which convey the flow of air axially along the outside of the jacket and the blower and to an outflow opening arranged at the blower with a view to concentrating the flow of air from the vacuum cleaner.
GB A 2 062 451 also teaches a suction cleaner in the form of a vacuum cleaner and having around the motor a jacket of a silencing material. Outside this jacket a further jacket is arranged which is spaced from the innermost jacket by means of studs whereby a number of interconnected flow paths are provided which extend partially axially relative to the rotational axis of the motor. This prior art suction cleaner is associated with the problem that the flow passages which are covered by the jackets and the activated studs give rise to a fairly turbulent flow pattern with ensuing large friction losses.
The vacuum cleaner according to DE 34 02 603 A1 distinguishes itself over other known types by the jacket enclosing the motor being of a silencing material, such as foamed plastics, whereby the jacket is self-supporting and does not have to be braced as is the case with other types of vacuum cleaners, such as e.g. the vacuum cleaner according to U.S. Pat. No. 5,293,664 or DE C 64 13 71 wherein the jacket is of a silencing material applied as a surface coating on a relatively rigid jacket-shaped element in combination with the radially arranged flow passages resulting in a relatively small friction loss in the flow. By the substantially self-supporting jacket according to DE 34 02 603 A1 a reduction of the sound transmission through rigid elements in the structure of the vacuum cleaner is further obtained while simultaneously providing a silencing jacket which is comparatively simple and inexpensive to manufacture.
SUMMARY OF INVENTION
It is the object of the present invention to provide a suction cleaner which, ceteris paribus, exhibits improved silencing and flow properties compared to the known type described above and obtainable with the prior art according to DE 34 02 603 A1, and which is also more simple to manufacture.
This is obtained with a suction cleaner of the type claimed or by use of the silencer according to the invention, since hereby the flow passages in the silencer element extend substantially axially along the motor in their entire length and at the same time the walls which separate the individual flow passages ensure a suitable bracing of the silencer element without ensuing large flow losses due to a turbulent flow pattern.
This allows for smaller dimensions of the motor housing in the radial direction and prevents the air flow from travelling along the inside of the motor housing, which would in itself contribute to the transmission of noise to the outside of the motor housing.
Moreover the invention provides the possibility of extending the flow passages considerably in the silencer element whereby improved silencing is obtained, since long passages pr
REFERENCES:
patent: 2884185 (1959-04-01), Dolan
patent: 4356591 (1982-11-01), Lude
patent: 5159738 (1992-11-01), Sunagawa et al.
patent: 5293664 (1994-03-01), Lim et al.
patent: 5720074 (1998-02-01), Lee
patent: 5894629 (1999-04-01), Kim
Jensen Thomas Dam
Larsen Peter N.o slashed.hr
Moore Chris K.
Nilfisk A/S
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