WO2007062889A2

WO2007062889A2 - Gas flow generator comprising a gas outlet and a noise reducer, and method for the reduction of noise

Info

Publication number: WO2007062889A2
Application number: PCT/EP2006/067030
Authority: WO
Inventors: Robert Bösnecker
Original assignee: Siemens Aktiengesellschaft
Priority date: 2005-11-30
Filing date: 2006-10-04
Publication date: 2007-06-07
Also published as: DE102005057399B4; DE102005057399A1; WO2007062889A3

Abstract

The invention relates to a gas flow generator (1) comprising a gas outlet (2) and a noise reducer (3) as well as a method for reducing noise emission. The aim of the invention is to improve devices and methods known in prior art regarding noise reduction by means of a noise reducer (3). Said aim is achieved by a noise reducer (3) comprising a gas-conducting assembly (4) which adjoins the gas outlet (2) and whose cross-sectional flow area increases in the direction of the generated gas flow. Such gas flow generators (1) comprising a noise reducer (3) can be used for air conditioners or room ventilation systems.

Description

description

Gas flow generator with a gas outlet and with a noise reducer and method for noise reduction

The invention relates to a gas flow generator with a gas outlet and with an acoustic noise reducer and to a method for reducing an interference sound emission.

Gas flow generators or air flow generators or air drives have long been known, for example in the field of air conditioning. By means of a mechanical force, gas or air is transferred from the stationary to a moved state by means of a ^suitably designed drive element, for example a fan wheel or a propeller. In this process, not only the desired effect of moving air, he reached ^¬ but also an undesirable effect, namely He ^¬ generation of sound. Sound refers to vibrations of the air which are for the most part in the hearing range of the human ear. The sound generated by the drive element is disturbing. It is referred to below as noise.

In air conditioning systems, 4 to 5 slide absorbers are arranged offset from each other directly behind an air flow generator for noise reduction. Although this achieves ei ^¬ ne noise reduction of about 30 to 35 dB, but the air flow is at the same time greatly abge ^¬ brakes. The disadvantage here is that a drive in ^¬ example, an electric motor must be designed to be correspondingly larger in order to overcome the caused by the slide absorber air resistance.

DE 198 32 517 C2 discloses a method and a device for active sound damping in a channel through which a medium can flow. It is an object of the present invention to improve the device and the method according to the prior art with respect to noise reduction.

The apparatus related object is achieved by a gas ^¬ flow generator, with a gas outlet and schallreduzierer with a fault, comprising an adjoining the outlet gas bearing arrangement with enlarging in the direction of the gas flow generated flow cross-sectional area. Since the gas or the air is guided in such a way through the gas-leading arrangement that minimizes turbulence who ^¬ is with advantage of the background noise produced is less than the ambient noise at a gas flow generator without such a gas bearing arrangement.

According to the invention generating Ku ^¬ lissenabsorber a drive can be dispensed with in favor of a lower energy consumption at the air resistance. With such a Gasströ ^¬ tion generator can be a structural unit beispielswei- se air conditioning, much smaller. The Einsatzmög ^¬ possibilities of, for example, air conditioning systems in buildings, ships, aircraft, vehicles, containers, etc. are improved by a space-saving design.

In an expedient embodiment according to the invention, the gas flow generator is prepared in such a way that the noise reducer has a sound signal generator for generating counter-noise in the region of the increasing flow cross-sectional area. The arrangement of the sound signal transmitter preferably as close as possible to the noise source and within a defined gas flow has the advantage of reducing the noise produced, preferably to a minimum.

Conveniently, a boundary wall of the gas- ^{conducting ¬} arrangement in the direction of the generated gas stream, preferably funnel-shaped, rectilinear. A funnel-shaped ge arrangement conducts the background noise with advantage so that it propagates as a spherical wave.

Furthermore, it has proved to be expedient that a boundary wall of the gas-conducting arrangement in the direction of the generated gas flow, preferably funnel-shaped, is curved. Depending on the speed, or the specific gravity of the gas of the gas stream different ge ^¬ shaped gas-bearing assemblies for use in order to keep the gas flow as possible laminar.

It is also advantageous that a contour of the curved ge ^¬ shaped boundary wall substantially follows an exponential function.

A further optimization in terms of the guided gas flow is achieved in an expedient manner in that the contour of the curved shaped boundary wall in Wesent ^¬ handy a polynomial function, in particular a sum of exponential functions or sections different from each other exponential functions follows. Particularly important in a contour which follows an exponential function or a polynomial function, it is that due to the shape, preferably an exponential funnel, the gas flow as unbraked as possible, preferably without Abrisskan ^¬ th, spread and that the sound preferably orthogonal from the funnel edge. That is, with ^¬ play, in the transition of the funnel to a Raumluftka ^¬ nal is the edge of the hopper at right angles to the longitudinal direction of the indoor air channel and the sound waves exit the

Funnel edge vertical. Spoiler lips to be the vermie possible ^¬.

The gas or air as already mentioned by the gas bearing arrangement made such that turbulence mi ^¬ be nimiert. Since turbulences acoustically ensure that a phase of the noise is also "swirled", ie that the phase position is unpredictable, has a defined conduction of the gas or the moving air in addition to the reduced noise the advantage of safe prediction or determination of the phase position of the noise to ge ^¬ guarantee.

Preferably, the acoustic signal generator is a Signalverarbei ^¬ associated processing unit. A quick mikroprozessorgesteu ^¬ erte signal processing unit provides effective noise suppression by anti-noise.

According to a preferred embodiment of the invention, the signal processing unit for calculating a correction function for driving the sound signal generator and / or the gas ^¬ flow generator in terms of a, preferably maxima- Ie, noise reduction prepared. In an advantageous ^manner , an optimal ^noise reduction is calculated by means of the correction function.

It is expedient that the correction function provides correction values for the sound-signal generator generating the counter-noise and / or for a parameter influencing the drive, in particular a rotational speed, of the gas flow generator.

Preferably, the gas flow generator has a gas-moving element, in particular a fan, in particular a Schau ^¬ fel on.

The gas flow generator preferably has a sensor for generating an input variable for the signal processing unit.

In an expedient embodiment of the invention, the sensor is prepared for the detection of background noise.

In a further advantageous embodiment, the sensor for detecting an event triggering the noise on the gas flow generator or in the interior or the latter immediate environment, in particular at the gas outlet, angeord ^¬ net and / or prepared.

Other alternative developments and special embodiment of the invention can be found in the dependent claims 14 to 21.

In an expedient embodiment of the invention, preferably for building technology, an air conditioning system with a gas flow generator according to the invention is used. It is advantageous that the air conditioner with the gas flow generator according to the invention emits less noise and can be constructed on the basis of improved flow characteristics with a reduced-power drive.

In an alternative embodiment of the invention, a room ventilation system is prepared with a gas flow generator according to the invention.

The method according to the object is achieved ^{¬ it} , that the gas flow is guided by a gas-conducting arrangement such that turbulences are minimized, with a phase angle of the noise is determined in order to ^¬ calculate from a reduction causing counter-noise and produce. It is advantageous in this method that the phase angle of the noise can be determined with respect to a Redu ^¬ cation of noise.

It is of very particular usefulness that the counter sound is generated in the direction of the noise. A compo nent ^¬ a Störschallvektors should be parallel to a counter-noise vector. Thus, it is preferably possible to achieve optimal cancellation of background noise to counter-noise in terms of maximum noise reduction.

Further advantages and embodiments of the solution according to the invention can be found in the following description of a non-limiting embodiment. The embodiments of the invention will be described in more detail below with reference to the drawing. Showing:

1 shows a gas flow generator with noise-reducing device, FIG. 2 shows a gas-conducting arrangement in a sectional view on the section line II-II of FIG. 1,

3 gas flow generator with rectilinear funnel,

4 shows the shape of a gas-conducting arrangement and

5 shows gas flow generators with further gas-moving elements for sound suppression.

1 shows schematically a gas flow generator 1, which has a gas outlet 2, to which a noise reducer 3 adjoins. As an essential element, the Störschallreduzierer 3 on a gas-conducting arrangement 4, which is shown as an exponential funnel in a sectional view. The gas-carrying assembly 4 includes UNMIT ^¬ telbar to the gas outlet 2 and has a in the direction of the generating gas flow widening flow cross-sectional area. After the gas outlet 2 of the gas-carrying assembly 4 are disposed two sound signal encoder 5 ^¬ offset of the same type by 180 ° in the Begren ^¬ Zung wall (see also Figure 2). The sound signal generator 5 are arranged such that their generated counter sound 7 propagates - at least with a component - in the direction of an interference sound 6.

The gas flow generator 1 is used for air injection into a network of air conditioning ducts, not shown. The principle of operation of the Störschallreduzierers 3 is to interfere with the Störschall 6, which is generated by a gas-moving element 10 with a counter sound 7 and thus the moving air 8 disturbing sound components to escape.

The gas-moving element 10 is moved by means of a Elektroantrie- bes M. The electric drive M is a variable-speed motor and is connected via a data line with a signal processing unit 9 in connection. The drive can thus forward an actual variable to the signal processing unit 9 as well as a manipulated variable, such as a speed, take from this.

The signal processing unit 9 is connected to numerous other sensors, which are described below, via data lines. A sound pressure sensor 11 is arranged in the lower region of the gas-conducting arrangement 4 immediately after the gas outlet 2. The sound pressure sensor 11 measures fortlau ^¬ fend the sound pressure which is generated by the gas moving member 10 and passes out of the outlet 2 in the gas-bearing arrangement. 4 The sound pressure sensor 11 detects the values of the sound pressure and forwards them to the signal processing unit 9 via a data line. An optical sensor 12 detects the movement of the gas moving element 10 and derives a synchronizing signal for the Signalver ^¬ processing unit 9 from. With the synchronizing signal, even before the background noise is generated by means of the event ^¬ ses, such as a blade impact, the future Störschallerzeugung a countermeasure for Störschallreduzie- tion be triggered.

A magnetic sensor 13, which is arranged on the housing wall of the gas flow generator 1, detects a rotational speed ^¬ and vibration of the gas flow generator 1 and managerial tet these values to the signal processing unit 9 on.

Furthermore, a pressure gradient sensor 14 is arranged on the route between the gas outlet 2 and the arrangement of the sound signal generator 5.

Also connected via a data line to the signal processing ^¬ unit 9 is a sonic rapid sensor 15th

As a further instrument for a built-in by the sensors and the sound signal generator 5 in cooperation with the signal processing unit 9 Störschallreduzierungsregel- is a measuring microphone 16 directly at the output of the Störschallreduzierers 3 for measuring the noise components of the moving air 8 is arranged.

The background noise is reduced, on the one hand, by the defined air line by means of the gas-conducting arrangement 4 and, on the other hand, by the generation of counter sound 7 by the sound signal generator 5. A first step therefore consists of a low-turbulence line of the air, which preferably already takes place in the housing of the gas flow generator 1 through a suitably designed gas outlet 2.

After the moving air has left the gas flow generator 1, it flows enriched with background noise 6 through the gas ^¬ outlet 2 in the gas-bearing arrangement 4. There it is forwarded defined. Due to the defined air line, it is now possible to measure and calculate the phase position of the noise 6 by means of the sound pressure sensor 11 and the signal processing unit 9.

The knowledge of the phase position of the noise 6 can be further measured by a measurement with a microphone 16 at the gas outlet 2, also the determination of the phase position based on the geometric properties of the gas-conducting arrangement 4 is possible. Furthermore, the phase angle of the noise 6 is determined by a derivative of a rotational speed of the gas ^¬ flow generator 1 by means of the magnetic sensor 13 and the optical sensor 12.

If the "type" of the noise 6 known and determines the phase position can be carried out a counter correction now. In this case, the outflowing air is fed an additional acoustic signal by the acoustic signal generator 5, the sound corresponding to the noise field 6, but the phase angle of the Pha ^¬ senlage of the noise 6 against is set. This signal is called anti-noise 7. through him a minimization ^¬ done tion of the noise 6. For optimal reduction of the noise 6 it is particularly important that, firstly, the spectrum of the counter sound 7 as possible equal to the spectrum of the Noise 6 is and that, secondly, the phase position of the counter ^¬ sound 7 of the phase angle of the noise 6 by means of Sig ^¬ nalverarbeitungseinheit 9 has been superimposed such that a minimization of the noise 6 is achieved. The phase angle of the counter-noise 7 can be frequency-dependent. It is not necessarily inverse to the phase of the noise 6. It is also possible to divide the noise 6 in frequency groups to accomplish a suppression of the respective frequency band can.

2 shows that of Figure 1, along section line II - II ge ^¬ cut, gas-bearing assembly 4. The sound signal transmitter 5 to the suppression of the noise are 180 ° offset ^¬ assigns and thus oppose each other. A star-shaped arrangement of sound signal generators 5 around the gas-conducting arrangement 4 is also possible.

FIG. 3 shows, in a further exemplary embodiment, the gas flow generator 1 known from FIG. 1 with a rectilinear funnel-shaped gas-conducting arrangement 4a.

FIG. 4 shows, for the gas-conducting arrangement 4 known from FIG. 1, the basic shape curve of the boundary wall or walls, which follows the path of an exponential function in the direction of sound propagation X.

5 shows an alternative embodiment of the noise suppression is shown. The gas flow generator with its gas-moving element 10 and the gas-conducting arrangement 4 has, as an alternative to the embodiment in FIG. 1, with preferably loudspeakers, two additional gas-moving elements 22 for noise suppression. Analogously to the control with the signal processing unit 9 from FIG ^¬ ing elements 22 for noise suppression controlled. The background noise 6 is superimposed by the generated by the gas moving elements 22 counter sound 7 and cleared ^¬ .

Claims

claims

1. Gas flow generator (1) with a gas outlet (2) and with a noise suppression (3) comprising a gas outlet to the (2) adjoining gas-conducting arrangement (4) in the direction of the generated gas flow magnifying flow cross-sectional area.

2. gas flow generator (1) according to claim 1, characterized in that the Störschallreduzierer (3) comprises a sound signal generator (5) for generating counter-sound (7) in the region of increasing flow cross-sectional area.

3. gas flow generator (1) according to claim 1 or 2, characterized in that a boundary wall of the gasfüh ^¬ generating arrangement (4a) in the direction of the generated gas stream, preferably funnel-shaped, is rectilinear.

4. gas flow generator (1) according to one of claims 1 to 3, characterized in that a boundary wall of the gasfüh ^¬ generating arrangement (4) in the direction of the generated gas stream, preferably funnel-shaped, is curved.

5. gas flow generator (1) according to claim 4, characterized in that a contour of the curved shaped ^¬ bounding wall substantially follows an exponential function.

6. gas flow generator (1) according to claim 4 or 5, characterized in that the contour of the curved shaped ^¬ th boundary wall substantially a polynomial function, in particular a sum of exponential functions or sections different from each other exponential functions, follows.

7. gas flow generator (1) according to one of claims 2 to 6, characterized in that the sound signal generator (5) is associated with a signal processing unit (9).

8. gas flow generator (1) according to claim 7, characterized in that the signal processing unit (9) for calculating a correction function for driving the sound signal generator (5) and / or the gas flow generator (1) with respect to a, preferably maximum, noise emission sound reduction is prepared.

9. gas flow generator (1) according to claim 8, characterized in that the correction function correction values for the counter sound (7) generating sound signal generator (5) and / or for a drive-influencing

Characteristic, in particular a speed of the gas flow generator (1) provides.

10. gas flow generator (1) according to one of claims 1 to 9, characterized by a gas moving element (10), in ^¬ particular a fan, in particular a blade.

11. Gas flow generator (1) according to one of claims 1 to 10, characterized by a sensor (11 to 16) for generating an input variable for the signal processing unit (9).

12. Gas flow generator (1) according to claim 11, characterized in that the sensor (11,14,15,16) is prepared for the detection of background noise (6).

13. Gas flow generator (1) according to claim 11, characterized in that the sensor (12,13) for detecting an interference sound (6) triggering event at the gas flow generator (1) or in the interior or its immediate vicinity, in particular on Gas outlet (2), arranged and / or prepared.

14. Gas flow generator (1) according to any one of claims 11 to

13, characterized in that the sensor is one of the following sensors:

a sound pressure sensor (11), an optical sensor (12),

a magnetic sensor (13),

a pressure gradient sensor (14),

a sound-speed sensor (15),

- A measuring microphone (16) which s / s with the signal processing unit (9) in connec ^tion .

15. Gas flow generator (1) according to one of claims 11 to

14, characterized in that the movement, in particular a rotation of the gas-moving element (10) and / or an associated drive (M) by means of the sensor (12,13) detectable and from a synchronizing signal for generating the counter sound (7) can be derived ,

16. Gas flow generator (1) according to one of claims 2 to

15, characterized in that the sound signal generator (5) is prepared with at least one piston speaker.

17. Gas flow generator (1) according to one of claims 2 to

16, characterized in that the sound signal generator (5) is prepared with at least one bending wave loudspeaker.

18. Gas flow generator (1) according to one of claims 2 to

17, characterized in that for generating the counter sound (7) at least one further gas-moving element (22) is arranged.

19. Gas flow generator (1) according to one of claims 2 to

18, characterized in that several counter sound (7), he ^¬ convincing sound signal generator (5) a ring around a midrange longitudinal axis of the gas-carrying arrangement are arranged forming.

20. gas flow generator (1) according to one of claims 2 to 19, characterized in that a plurality of counter-sound (7) er ^¬ generating sound signal generator (5) are arranged flat in or on the boundary wall of the gas-conducting arrangement (4).

21 gas flow generator (1) according to one of claims 2 to 20, characterized in that several counter sound (7) he generating ^¬ sound signal generator (5) are arranged as a cluster with a changing direction of the gas flow distribution density ^¬ .

22. An air conditioner with a gas flow generator (1) according to one of claims 1 to 21.

23. Room ventilation system with a gas flow generator (1) according to one of claims 1 to 21.

24. A method for reducing a Störschallaussendung, preferably for operating the gas flow generator (1) according to one of claims 1 to 21, wherein the gas flow through a gas-conducting arrangement (4) is guided in such a way that Verwirbe- lungs are minimized, wherein a phase position of the Stör ^¬ sound (6) is determined in order to calculate and generate a reduction causing counter-noise (7).

25. The method according to claim 24, characterized in that the counter sound (7) in the direction of the noise (6) is generated.