Title of Invention

DEVICE FOR FILTERING AN AIR STREAM

Abstract In order to provide a device (1) for filtering an air stream (2), with at least one preseparator (3) for the separation of coarse impurities and with a filter unit (5), following the preseparator (3) in the direction of the air stream (2), for filtering smaller impurities, said device making it possible to have constant separation rates and constant pressure drops even in the case of air streams of different size, a multiplicity of preseparators (3) arranged parallel to one another are proposed, at least one air flap (4) being arranged upstream of the preseparators (3) in the direction of the air stream (2) and being designed for setting the air stream which passes through the preseparators (3).
Full Text 2006P18746 IN - 1 -
Description
Device for filtering an air stream
The invention relates to a device for filtering an air stream,
with at least one preseparator for the separation of coarse
impurities and with a filter unit, following the preseparator
in the direction of the air stream, for filtering smaller
impurities.
Such a device is already known, for example, from
DE 689 05 389 T2 . This describes a device for filtering outside
air, which has a preseparator for separating coarse impurities,
such as dust, pollen or the like. The preseparator is followed
in the path of the air stream by a filter unit which is set up
for filtering the air stream by means of filter cartridges
consisting, for example, of suitable cellulose. In this case,
the filter cartridge also retains finer dirt particles and thus
ensures that an emerging air stream is essentially dust-free.
DE 698 16 009 T2 discloses a cyclone separation device, as it
is known. Cyclone separators have suitable guide means for
swirling an entering air stream. Coarse dirt particles, such as
dust or the like, are carried outward due to the swirling and
are separated.
DE 298 19 335 U1 describes a device for filtering outside air,
a preseparator and a filter unit being arranged in the path of
an air stream. The preseparator consists of a multiplicity of
cyclone separators arranged parallel to one another.
The generic device already known has the disadvantage that, in
the case of air streams of different size, different degrees of
separation and pressure drops are generated. This may, however,
be disadvantageous for other following devices, such as, for
example, air-conditioning systems or the like.

2006P18746 IN - 2 -
The object of the invention, therefore, is to provide a device
of the type initially mentioned, which makes it possible to
have constant separation rates and constant pressure drops,
even in the case of air streams of different size.
The invention achieves this object by means of a multiplicity
of preseparators arranged parallel to one another, at least one
air flap being arranged upstream of the preseparators in the
direction of the air stream and being designed for setting the
air stream which passes through the preseparators.
According to the invention, a multiplicity of preseparators are
provided, which are arranged parallel to one another. In this
case, an air flap serves or a plurality of air flaps serve for
setting the air stream. The air flap or the air flaps therefore
determines or determine the number of preseparators through
which the air stream passes, and also the air volume which
passes through the preseparators within a predetermined period
of time. Thus, for example, it is possible to generate high air
streams in which a large air volume passes through the device
according to the invention within a short period of time. In
this case, at the same time, the number of preseparators
through which the air stream passes increases. The air stream
in each preseparator thus remains essentially constant, and
therefore the degree of separation of the preseparator and of
the overall device according to the invention also remains
essentially constant. Furthermore, due to the larger flow
impact area for the air stream, the resistance and therefore
the pressure drop provided by the device according to the
invention are kept constant.
Advantageously, a fan is provided for generating the air
stream. The fan is expediently connected to an energy supply
and can be operated, for example, from the driver's cab of a

2006P18746 IN - 3 -
rail vehicle. The device according to the invention is suitable
particularly for use in a rail vehicle.
According to a further development which is expedient in this
respect, the fan is designed for generating air streams of
different size. On account of this expedient further
development, the device according to the invention can be
adapted in a simple way to different requirements, for example
by increasing the rotational speed of the pump by means of a
variable drive.
The fan expediently follows the filter in the direction of the
air stream.
According to a preferred refinement of the invention,
regulation means for setting each air flap as a function of a
predetermined desired value are provided. The desired value
corresponds, for example, to a desired volume throughflow
through the device according to the invention, the regulation
means having a desired-value actuator, by means of which the
position of the air flap is set so that a predetermined
pressure drop is established.
Expediently, the preseparators are cyclone separators. Cyclone
separators are known according to the popular prior art, and
therefore need not be dealt with in any more detail at this
juncture.
Further expedient refinements and advantages of the invention
are the subject matter of the following description of
exemplary embodiments of the invention, with reference to the
figures of the drawing in which
the figure shows a diagrammatic illustration of an exemplary
embodiment of the device according to the invention.

2006P18746 IN - 4 -
The figure shows, in a diagrammatic illustration, an exemplary
embodiment of the device 1, according to the invention, which
has a preseparator 3, arranged in the path of an air stream 2,
in the form of a cyclone separator 3. The cyclone separator 3
illustrated in the figure stands symbolically for a
multiplicity of cyclone separators 3 arranged parallel to one
another. An air flap 4 precedes the cyclone separators 3 in the
direction of the air stream. By the air flap 4 being opened or
closed by control means, not illustrated in the figure, the air
stream 2 passes through the cyclone separator 3, arranged
downstream of the air flap 4, as a function of the position of
the air flap 4. The f ree-throughf low cross section of the
overall cyclone separator is therefore dependent on the
position of the air flap 4.
The cyclone separator 3 is followed by a filter unit 5 which
has, for example, a conventional filter cartridge. Filter units
are known as such to a person skilled in the art, and therefore
do not need to be dealt with in any more detail at this
juncture. The filter unit 5 is followed by a variable-speed fan
6 which is driven by an energy supply unit 7.
The device illustrated in the figure is, for example, part of a
rail vehicle and precedes the ventilation and air-conditioning
system of the rail vehicle. It serves for sucking in outside
air which first enters the preseparator 3, depending on the
position of the air flap 4. The outside air is prepurified in
the preseparator 3, so that coarse suspended particles, dust or
the like are removed from the air stream 2. The air stream 2
subsequently passes through the filter unit 5 and its filter
cartridge, which retains finer dirt particles as a function of
the pore size of the system used. The air stream 2 subsequently
passes through the fan and leaves the device 1, purified
ambient air being provided for the following ventilation and
air-conditioning system.

2006P18746 IN - 5 -
By virtue of this device according to the invention, therefore,
the degree of separation, the filtration class and the pressure
drop of the air stream when it passes through the device, which
is arranged, for example, in a suitable duct-shaped housing,
can be set in any desired way. The preseparator 3 therefore has
a variable active cross section, specifically depending on the
position of the air flap 4. The pressure drop of the device
according to the invention can thus be preselected.
Furthermore, the device according to the invention provides a
constant degree of separation even for different air streams.

2006P18746 IN - 6 -
Patent Claims
1. A device (1) for filtering an air stream (2), with at
least one preseparator (3) for the separation of coarse
impurities and with a filter unit (5) , following the
preseparator (3) in the direction of the air stream (2), for
filtering smaller impurities, characterized by a multiplicity
of preseparators (3) arranged parallel to one another, at least
one air flap (4) being arranged upstream of the preseparators
(3) in the direction of the air stream (2) and being designed
for setting the air stream which passes through the
preseparators (3).
2. The device (1) as claimed in claim 1,
characterized by a fan (6) for generating the air stream (2).
3. The device (1) as claimed in claim 2,
characterized in that the fan (6) is designed for generating
air streams of different size.
4. The device (1) as claimed in claim 2 or 3,
characterized in that the fan (6) follows the filter (5).
5. The device (1) as claimed in one of the preceding claims,
characterized by regulation means for setting each air flap (4)
as a function of a predetermined desired quantity.
6. The device (1) as claimed in one of the preceding claims,
characterized in that each preseparator is a cyclone separator
(3) .

In order to provide a device (1) for filtering an air stream
(2), with at least one preseparator (3) for the separation of
coarse impurities and with a filter unit (5), following the
preseparator (3) in the direction of the air stream (2), for
filtering smaller impurities, said device making it possible to
have constant separation rates and constant pressure drops even
in the case of air streams of different size, a multiplicity of
preseparators (3) arranged parallel to one another are
proposed, at least one air flap (4) being arranged upstream of
the preseparators (3) in the direction of the air stream (2)
and being designed for setting the air stream which passes
through the preseparators (3).

Documents:

01184-kol-2007-abstract.pdf

01184-kol-2007-claims.pdf

01184-kol-2007-correspondence others 1.1.pdf

01184-kol-2007-correspondence others.pdf

01184-kol-2007-description complete.pdf

01184-kol-2007-drawings.pdf

01184-kol-2007-form 1.pdf

01184-kol-2007-form 18.pdf

01184-kol-2007-form 2.pdf

01184-kol-2007-form 3.pdf

01184-kol-2007-form 5.pdf

01184-kol-2007-gpa.pdf

01184-kol-2007-others.pdf

01184-kol-2007-priority document.pdf

1184-KOL-2007-(11-01-2012)-ABSTRACT.pdf

1184-KOL-2007-(11-01-2012)-CLAIMS.pdf

1184-KOL-2007-(11-01-2012)-CORRESPONDENCE.pdf

1184-KOL-2007-(11-01-2012)-DESCRIPTION (COMPLETE).pdf

1184-KOL-2007-(11-01-2012)-DRAWINGS.pdf

1184-KOL-2007-(11-01-2012)-FORM-1.pdf

1184-KOL-2007-(11-01-2012)-FORM-2.pdf

1184-KOL-2007-ABSTRACT 1.1.pdf

1184-KOL-2007-AMANDED CLAIMS.pdf

1184-KOL-2007-AMANDED PAGES OF SPECIFICATION.pdf

1184-KOL-2007-CORRESPONDENCE OTHERS 1.2.pdf

1184-KOL-2007-CORRESPONDENCE.pdf

1184-KOL-2007-DESCRIPTION (COMPLETE) 1.1.pdf

1184-KOL-2007-DRAWINGS 1.1.pdf

1184-KOL-2007-EXAMINATION REPORT.pdf

1184-KOL-2007-FORM 1-1.1.pdf

1184-KOL-2007-FORM 18.pdf

1184-KOL-2007-FORM 2-1.1.pdf

1184-KOL-2007-FORM 3 1.2.pdf

1184-KOL-2007-FORM 3-1.1.pdf

1184-KOL-2007-FORM 5.pdf

1184-KOL-2007-GPA.pdf

1184-KOL-2007-GRANTED-ABSTRACT.pdf

1184-KOL-2007-GRANTED-CLAIMS.pdf

1184-KOL-2007-GRANTED-DESCRIPTION (COMPLETE).pdf

1184-KOL-2007-GRANTED-DRAWINGS.pdf

1184-KOL-2007-GRANTED-FORM 1.pdf

1184-KOL-2007-GRANTED-FORM 2.pdf

1184-KOL-2007-GRANTED-LETTER PATENT.pdf

1184-KOL-2007-GRANTED-SPECIFICATION.pdf

1184-KOL-2007-OTHERS 1.1.pdf

1184-KOL-2007-OTHERS.pdf

1184-KOL-2007-PETITION UNDER RULE 137.pdf

1184-KOL-2007-REPLY TO EXAMINATION REPORT 1.1.pdf

1184-KOL-2007-REPLY TO EXAMINATION REPORT.pdf

abstract-01184-kol-2007.jpg


Patent Number 252744
Indian Patent Application Number 1184/KOL/2007
PG Journal Number 22/2012
Publication Date 01-Jun-2012
Grant Date 29-May-2012
Date of Filing 28-Aug-2007
Name of Patentee SIEMENS AKTIENGESELLSCHAFT
Applicant Address WITTELSBACHERPLATZ 2, 80333 MUNCHEN
Inventors:
# Inventor's Name Inventor's Address
1 WINFRIED SCHUTZ ORDENSLANDSTR. 5, 82140 OLCHING
PCT International Classification Number B01D39/16; B01D46/02
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 102006041732.1 2006-09-01 Germany