DE102016206079A1 - Silencer for insertion into a fluid line of an engine and a method for damping sound - Google Patents

Abstract

The invention relates to a silencer (10) for insertion into a fluid line (30) of an engine (80), comprising a drivable rotor (14) comprising a rotor axis (24) and at least one rotor blade (16). A parallel projection of the rotor (14) with the rotor blade or blades (16) in the direction of the rotor axis (24) is a full circle surface. With an electric drive (20) for the rotor (14), a torque of the rotor (14) can be generated. Furthermore, a method for damping sound with such a silencer (10) is described.

Description

The invention relates to a silencer for insertion into a fluid line of an engine according to the preamble of claim 1. Furthermore, the invention relates to a method for damping sound according to the preamble of claim 8.

Moving mechanics, fluid flows and explosions cause noises. These processes also cause a great variety of noises in engines, especially in internal combustion engines. All sounds are perceived via sound. For sound and noise protection in the operation of engines, these volume emissions are damped or prevented.

In the FI 5346 A a muffler is shown in which a parallel projection of the rotor with the rotor blades or the one in the direction of the rotor axis forms a full circle. This property causes effective silencing.

From the US 2005 00 116 97 A1 is a muffler with unpowered propeller and known to reduce the turbulence of the fluid, the exiting sound and yet generated by the design of the rotor blades a low Aufstaudruck.

The silencing with the lowest possible accumulating effect in fluid lines of engines should be made even more effective.

The object of the present invention is to improve a silencer for insertion into a fluid line of an engine.

This object is achieved by a muffler for insertion into a fluid line of an engine with the features of claim 1. Advantageous embodiments and further developments of the invention are characterized in the dependent claims.

According to the invention, a silencer is provided for insertion into a fluid line of an engine, in particular engine for driving vehicles. The fluid line may be, for example, a fresh gas fluid line or preferably an exhaust fluid line. The muffler comprises a drivable rotor, wherein the rotor comprises a rotor axis and at least one rotor blade. The rotor is designed such that a parallel projection of the rotor with the rotor blade or blades in the direction of the rotor axis is a full circle surface. For this purpose, an electric drive for the rotor is provided, with which a torque of the rotor can be generated.

The fluid may preferably be a gas or gas mixture.

A producible torque is a decisive advantage because it reduces or preferably even prevents the accumulation effect of the silencer. The engine may in particular be an internal combustion engine, in internal combustion engines, the silencer may preferably be arranged as the last component in the exhaust pipe between the outlet of the tail pipe and an upstream component in the exhaust pipe. There, the sound occurring before exiting the tailpipe can best be reduced.

The parallel projection of the rotor as a full circle surface means, in particular, that the cross section of the fluid line can be a circle and can be covered by the rotor. As a result, the sound does not pass the silencer without being diverted and in particular damped.

In an advantageous embodiment of the invention, the rotor axis of the rotor extends substantially parallel to a direction of flow of fluid through a portion of the fluid conduit in an environment of the rotor.

This arrangement is advantageous because the flow hits the entire circular area of the rotor. The sound-absorbing effect is particularly great in this case. The flow direction is a simplified term in the context of this illustration and means the general direction in a fluid line. For this consideration, local turbulence at bends or edges, which lead locally to complex flow conditions, neglected.

In a development of the invention, the muffler comprises a rotor which is not driven.

Off-load means that the rotor does not drive any other component or transmits any output to another component. A driven rotor is independent of the operating parameters of other components, units or machines. The rotor can thus be operated for optimum sound attenuation and reduction of the accumulation effect.

A further advantageous development includes that the electric drive of the muffler has an electric motor with which a torque can be generated and / or transferred to the rotor.

An electric motor represents a cost-effective and space-saving design of a drive. A torque that can be transmitted to the rotor describes, for example, a shaft which can be rigidly connected to the rotor. The electric motor can also be designed so that the motor forms an antipole to the rotor, so the rotor is part of the engine itself. In this case, a torque is generated directly on the rotor. This saves further installation space and also reduces the number of component parts.

In a preferred embodiment of the invention, the electric drive may have an electric motor and a shaft which is rigidly connected to the motor. With the electric motor torque can be generated on the shaft. This development has the advantage that a rigid connection can determine the movements of the rotor with little delay and tolerance.

In a further development of the invention, the rotor of the muffler is formed in a roll shape or in a propeller shape.

A propeller is particularly advantageous by its shape to reduce the stowage effect when the propeller is driven. The roller shape describes a propeller that has been pulled out, the advantage of the propeller with respect to the stowage effect remains, and a better reduction of noise by the length of the roller is added. In certain embodiments, the roller may, for example, extend along the fluid line and have one or more propellers arranged in the interior, wherein the at least one propeller may extend over the length of the roller.

The muffler can be arranged in the context of the invention in the fluid line of an engine. In this case, the muffler between a first conduit part and a second conduit part at a connection point of the first and second conduit part is releasably attached.

Due to the detachable attachment between two pipe parts of the muffler can be mounted in an advantageous manner and interchangeable, in particular non-destructively mounted and interchangeable. The attachment to the joints can be done for example via a flange, clamps or other known fasteners. In addition, the attachment can also be done by clamping with an axial tension.

For sound reduction, in an advantageous development of the invention, a fluid line of an engine, preferably an internal combustion engine is provided, in which the silencer upstream of an outlet of an end of the engine - preferably in the underbody of a motor vehicle in embodiments for which the engine is a prime mover - arranged is. Preferably, the muffler is arranged between the outlet of an end pipe and an upstream component in the exhaust pipe as the last component.

The arrangement upstream of the outlet of a tailpipe reduces the temperature load on the muffler. At the outlet of a tailpipe, the temperature is lower than in the vicinity of the engine. The requirements for the components of the silencer are reduced by the lower temperatures. The positioning also allows an improved reduction of the sound. At the outlet, the sound of all pre-ordered components can be reduced.

According to the invention, a method is also provided for damping sound with a drivable rotor in a fluid line of an engine. The rotor comprises a rotor axis and at least one rotor blade. In this case, a parallel projection of the rotor with the rotor blade or blades in the direction of the rotor axis is a full circle surface. In the method according to the invention, the rotor is driven, to a torque of the rotor is generated with an electric drive for the rotor.

A muffler can cause an undesirable back pressure in the fluid lines of engines, by the torque generated, this jam pressure can be reduced. The driven rotation of the rotor can promote the flow of fluid downstream of the muffler and reduce the jam pressure.

The invention is developed in an advantageous embodiment so that the electric drive for the rotor is controlled in dependence on a speed of a fluid mass flowing through in the fluid line upstream of the muffler.

The dynamic pressure reduction according to the invention in the sound attenuation is effected in this embodiment by the muffler accelerating the fluid flow, thus the range of action over an independent control is advantageously extended by the control as a function of the velocity of the fluid mass flowing through upstream of the muffler.

In one development of the invention, the speed of the fluid mass flowing through in the fluid line upstream of the muffler is determined via an operating state of the engine with the aid of a control unit and / or a computing unit.

The determination of the velocity of the fluid mass flowing through in the fluid line upstream of the muffler has the advantage that it allows the required power of the electric drive to be accelerated to accelerate the fluid mass flowing through and thus to reduce the dynamic pressure. The determination of the performance of the electric drive ensures that there is the advantage of reducing the dynamic pressure. In the case of internal combustion engines, the operating states may mean, for example, the crankshaft revolutions per minute or the mass flow of fluid through the exhaust manifold of the internal combustion engine.

Further advantages and advantageous embodiments and developments of the invention will be described with reference to the following description with reference to the figures. It shows in detail:

1 A first embodiment of a silencer according to the invention,

2 A second embodiment of a silencer according to the invention,

3 an embodiment of a rotor of a silencer according to the invention and

4 a flow diagram of a method according to the invention for damping sound.

The 1 shows an embodiment of a silencer according to the invention 10 with a fluid line 30 an engine 80 , The silencer 10 is over a bracket 12 in the fluid line 30 arranged. Component of the silencer 10 is a rotor 14 , The rotor 14 has rotor blades 16 , A parallel projection of the rotor 14 forms with its rotor blades 16 in the direction of the rotor axis 24 a full circle surface. The direction of the rotor axis 24 corresponds to the direction of the fluid mass flowing through 32 upstream of the muffler 10 , The rotor 14 is with a wave 18 rigidly connected. The wave 18 is via an electric drive 20 acted upon by a torque. The electric drive 20 is with a control unit 50 controllably connected. The control unit 50 is with an engine of the engine 80 of a vehicle 90 controllably connected.

When a fluid mass flowing through 32 the fluid line 30 flows through, then meets the flowing fluid mass 32 on the muffler 10 , The silencer 10 dampens the sound through the rotor 14 , The rotor 14 reflects the sound back and / or the rotor 14 prevents the sound at the direct passage through the muffler 10 , This effect is due to the design of the rotor blades 16 affected.

By the electric drive 20 is a torque on the shaft 18 generated. Due to the applied torque, the rotor rotates 14 and the fluid mass flowing through 32 is accelerated. The fluid mass flowing through 32 is downstream of the muffler 10 through the rotor 14 swirls, the sound is damped and the fluid mass flowing through 32 accelerated. The control of the electric drive 20 via a control unit 50 that with the engine 80 is connected controllable.

About the operating parameters of the engine 80 determines the control unit 50 the velocity of the fluid mass flowing through 32 in the fluid line 30 upstream of the muffler 10 , This speed is provided by the controller 50 as a basis for calculating the control of the electric drive 20 used. The control unit 50 controls the electric drive 20 , The control is targeted to a resultant torque with which the rotor 14 the fluid mass flowing through 32 accelerated beyond the determined speed.

The 2 shows a second embodiment of a silencer according to the invention 10 , The rotor 14 of the muffler 10 is through the bracket 12 in the fluid line 30 positioned and on a rotor axis 24 fixed. The rotor 14 is cylindrical in the direction of the rotor axis 24 extended. The rotating mantle of the rotor 14 is as an antipode 22 of the electric drive 20 educated. The encircling jacket encloses the rotor blades 16 of the rotor 14 , The rotor 14 is thus designed as a roller-shaped impeller. A parallel projection of the rotor 14 forms with its rotor blades 16 in the direction of the rotor axis 24 a full circle surface. The direction of the rotor axis 24 corresponds to the direction of the fluid mass flowing through 32 upstream of the muffler 10 ,

When a fluid mass 32 the fluid line 30 flows through, then meets the flowing fluid mass 32 on the muffler 10 , The silencer 10 dampens the sound. The rotor 14 reflects the sound back and / or the rotor 14 prevents the sound at the direct passage through the muffler 10 , This effect is due to the design of the rotor blades 16 causes. The rotor 14 is about the moment through the fluid mass flowing through 32 also moved with a torque. The torque is directly on the rotor 14 generated. The generation of torque via the electric drive 20 , The electric drive 20 is through a control unit 50 switched so that the opposite pole 22 a moment experiences. By housing opposite pole 22 on the circulating Coat of the rotor 14 , this moment becomes the torque for the rotor 14 , Due to the torque, the fluid mass flowing through 32 accelerated and swirled. Downstream of the muffler 10 is the fluid mass flowing through 32 mixed and accelerated compared to their condition upstream of the muffler 10 ,

The control of the electric drive 20 via a control unit 50 that with the engine 80 controllably connected.

About the operating parameters of the engine 80 determines the control unit 50 the velocity of the fluid mass flowing through 32 in the fluid line 30 upstream of the muffler 10 , This speed is provided by the controller 50 as a basis for calculating the control of the electric drive 20 used. The control unit 50 controls the electric drive 20 , The control is targeted to a resultant torque with which the rotor 14 the fluid mass flowing through 32 accelerated beyond the determined speed.

The 3 represents an embodiment for a rotor 14 a silencer according to the invention 10 dar. The 3 shows a view along the rotor axis 24 of the rotor 14 from a position upstream of the muffler 10 , The silencer 10 is about the fortifications 12 in the fluid line 30 releasably fixed. The electric drive 20 is on the fluid line 30 fixed and the rotor 14 forms with the rotor blades 16 a full circle, which is the cross section of the fluid line 30 essentially covered. The full circle surface is in particular over the overlap area 15 the rotor blades 16 reached. The overlap area 15 has a particularly good sound-reducing effect of the muffler 10 and prevents the unhindered passage of sound.

The 4 shows a flow diagram of a method according to the invention for damping sound. In the first step 51 becomes a vehicle 90 with an engine 80 operated. The parameters of operation of the engine 80 be in step 53 from a controller 50 evaluated. Result of the evaluation in step 53 is the velocity of a fluid mass flowing through 32 in a fluid line 30 upstream of the muffler 10 , The speed will be in step 55 through the control unit 50 in a drive signal for a desired torque of the electric drive 20 transformed. In step 57 is a corresponding control of the electric drive 20 via the control unit 50 to the electric drive 20 transmitted. In step 59 a torque is generated by the electric drive and the fluid mass flowing through 32 moves through the muffler 10 wherein the sound is attenuated and the fluid mass flowing through 32 is accelerated.

LIST OF REFERENCE NUMBERS

10

silencer

12

bracket

14

rotor

15

overlap area

16

rotor blade

18

wave

20

electric drive

22

antithesis

24

rotor axis

30

fluid line

32

flowing fluid mass

50

control unit

51

step

53

step

55

step

57

step

59

step

80

combustion engine

90

vehicle

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• FI 5346 [0003]
• US 20050011697 A1 [0004]

Claims (10)

Silencer ( 10 ) for insertion into a fluid line ( 30 ) an engine ( 80 ), with a drivable rotor ( 14 ), which has a rotor axis ( 24 ) and at least one rotor blade ( 16 ), wherein a parallel projection of the rotor ( 14 ) with the rotor blade or blades ( 16 ) in the direction of the rotor axis ( 24 ) is a full circle surface, characterized by, an electric drive ( 20 ) for the rotor ( 14 ), with which a torque of the rotor ( 14 ) is producible. Silencer ( 10 ) according to claim 1, characterized in that the rotor axis ( 24 ) of the rotor ( 14 ) substantially parallel to a direction of flow of fluid through a portion of the fluid conduit (Fig. 30 ) in an environment of the rotor ( 14 ) runs. Silencer ( 10 ) according to claim 1 or 2, characterized in that the rotor ( 14 ) is unpowered. Silencer ( 10 ) according to one of the preceding claims, characterized in that the electric drive ( 20 ) has an electric motor, with which a torque on the rotor ( 14 ) is producible and / or transferable. Silencer ( 10 ) according to one of the preceding claims, characterized in that the rotor ( 14 ) is formed in a roll shape or a propeller shape. Fluid line ( 30 ) for an engine, characterized by a silencer ( 10 ) according to one of the preceding claims, wherein the silencer ( 10 ) is releasably secured between a first conduit part and a second conduit part at a connection point of the first and the second conduit part. Fluid line ( 30 ) of an engine according to claim 6, characterized by a silencer ( 10 ) according to one of the preceding claims, wherein the silencer ( 10 ) upstream of an outlet of a tailpipe of the engine ( 80 ) is arranged. Method for attenuating sound with a drivable rotor ( 14 ) in a fluid line ( 30 ) an engine ( 80 ), which has a rotor axis ( 24 ) and at least one rotor blade ( 16 ), wherein a parallel projection of the rotor ( 14 ) with the rotor blade or blades ( 16 ) in the direction of the rotor axis ( 24 ) is a full circle surface in which the rotor ( 14 ), characterized in that with an electric drive ( 20 ) for the rotor ( 14 ) a torque of the rotor ( 14 ) is produced. A method of attenuating sound according to claim 8, characterized in that the electric drive ( 20 ) for the rotor ( 14 ) in dependence on a velocity of a fluid mass ( 32 ) in the fluid line ( 30 ) upstream of the muffler ( 10 ) is controlled. A method of attenuating sound according to claim 9, characterized in that the velocity of the fluid mass ( 32 ) in the fluid line ( 30 ) upstream of the muffler ( 10 ) about an operating state of the engine ( 80 ) by means of a control unit ( 50 ) and / or a computing unit is determined.

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