Auxiliary silencing device for diesel generating set

Abstract

The utility model provides a kind of diesel generating set auxiliary muffler device, the auxiliary muffler device includes the silence box (01) connected with generating set;Silence box is the combination body with sound insulation ability formed by multiple shell (11), and the inner wall of silence box body is equipped with a large number of sound insulation cotton structure (21), and part of shell in combination body is equipped with the air scoop (22) for the ventilation or heat dissipation of generating set;Sound production device is installed in the ventilation opening of air scoop, when generating set works, sound production device emits the sound elimination wave that can reduce the noise wave amplitude of generating set in the ventilation opening air path;The utility model reduces the noise generated by unit work by configuring active muffler device at the ventilation opening of generating set silence machine box, and the device is simple in structure, easy to realize, and has good compatibility to existing product.

Description

TECHNICAL FIELD

[0001] The utility model relates to generator unit technical field especially diesel generator unit auxiliary silencer. BACKGROUND

[0002] Traditional generator unit generally increases additional mute machine case to generator unit to insulate the noise generated by generator unit in the box body to realize the noise reduction of the unit, and in order to meet the air required by temperature rise and internal combustion engine work, the venting and heat dissipation port of sufficient area needs to be opened on the mute box during design. Although the design of the venting port meets the heat exchange demand, the sound waves generated by the unit work will also be transmitted to the outside through the venting port, thereby reducing the sound insulation performance of the mute unit as a whole. The noise reduction by noise isolation of the mute box is also called passive noise reduction, and there is also active noise reduction technology in the noise reduction field. Noise frequency amplitude is obtained by detecting the sound source, and then the sound wave generator emits the sound wave with the same phase and opposite phase as the source noise frequency to realize sound wave interference cancellation, thereby realizing active noise reduction. The active noise reduction is commonly used in high-grade cars, indoor environments with high noise reduction requirements and the like. These application scenarios have a common feature, that is, noise reduction for an internal space, since external noise comes from different directions, and sound wave intensity and frequency change in real time with time, so the implementation of the technical scheme has high requirements for the sound source sampling point, the sound wave generator position and the noise reduction algorithm. Therefore, the application popularization rate of the active noise reduction technology is much lower than that of the passive noise reduction technology.

[0003] Since the noise frequency emitted by the generator unit during stable work is within a specific range, most of the sound waves remaining after the noise is isolated by the mute box are transmitted to the outside through the venting port of the mute box.

[0004] The utility model has the characteristics that the noise frequency and the sound source direction of the mute box venting port of the specific generator unit product are determined, and a hardware scheme capable of greatly simplifying the application requirements of the active noise reduction technology in the mute machine box generator unit is proposed. UTILITY MODEL CONTENTS

[0005] The utility model provides a diesel generator unit auxiliary silencer, which is configured with an active noise reduction device at the venting port of the mute machine box of the generator unit to reduce the noise generated by the unit work, and the device has simple structure and good compatibility with existing products.

[0006] The utility model adopts the following technical scheme.

[0007] An auxiliary muffling device for a diesel generating set, the auxiliary muffling device comprising a soundproof box (01) connected to the generating set; the soundproof box is a combination of multiple housings (11) with sound insulation capacity, a large number of sound insulation cotton structures (21) are arranged on the inner wall of the soundproof box, and some housings in the combination are provided with air scoops (22) for ventilation or heat dissipation of the generating set; a sound generating device is arranged in the air scoop, and the sound generating device emits a muffling sound wave capable of reducing the amplitude of the noise sound wave of the generating set in the air scoop when the generating set is working.

[0008] The air scoops are drawer-shaped air scoops, and multiple air scoops are arranged in parallel and form multiple protruding structures on the inner wall of the soundproof box.

[0009] The drawer panel of the drawer-shaped air scoop is provided with a sound generating device (25) on the side away from the generating set, and is provided with a sound wave processing device (24) on the side facing the generating set,

[0010] The drawer entrance of the drawer-shaped air scoop is a noise input end, and the back plate of the drawer-shaped air scoop is a noise output end.

[0011] The back plate of the drawer-shaped air scoop is a grid type ventilation structure arranged on the wall of the soundproof box, the sound wave output direction of the sound generating device is towards the back plate of the drawer-shaped air scoop, and the back plate of the drawer-shaped air scoop is provided with a sound wave collecting device (23).

[0012] The sound wave collecting direction of the sound wave collecting device is towards the drawer panel of the drawer-shaped air scoop, and the sound wave collecting device is connected to the sound wave processing device (24) to output the collected noise of the generating set to the sound wave processing device.

[0013] The sound wave collecting device and the sound wave processing device are both arranged in the soundproof box.

[0014] The muffling sound wave is absorbed by the sound insulation cotton structure after entering the soundproof box.

[0015] The sound generating device is a directional sound generating loudspeaker device.

[0016] The sound generating device is an array device composed of multiple small loudspeakers.

[0017] The sound wave processing device is provided with a memory, the memory pre-stores the frequency requiring muffling and the target amplitude of noise reduction according to the sound wave spectrum characteristics of the generating set, and the sound wave processing device is connected to the sound generating device to control the output of the muffling sound wave.

[0018] When the muffling sound wave enters the air scoop, it interferes with the original noise sound wave of the generating set in the air scoop, so that the amplitude of the noise wave is reduced to reduce the noise of the generating set, the muffling sound wave is an anti-phase sound wave corresponding to the noise spectrum of the source noise of the generating set, and the anti-phase sound wave has the same frequency and direction as the source noise but opposite phase.

[0019] The utility model discloses a drawer-shaped air scoop forms the turning type heat dissipation air duct, prolongs the mixed interference space of the noise wave and noise wave, can realize the more optimal active noise reduction effect.

[0020] The utility model discloses a generator set auxiliary silencer, through the active silencer device of configuration at the generator set mute machine case air vent to reduce the noise of unit work, and this device simple structure is easy to realize, and has good compatibility to the existing product. BRIEF DESCRIPTION OF DRAWINGS

[0021] The utility model is further explained in detail in the following combining with the specific embodiment and the drawing:

[0022] The utility model discloses a drawer-shaped air scoop forms the turning type heat dissipation air duct, prolongs the mixed interference space of the noise wave and noise wave, can realize the more optimal active noise reduction effect. Figure 1 It is the structure schematic diagram of the utility model;

[0023] The utility model discloses a drawer-shaped air scoop forms the turning type heat dissipation air duct, prolongs the mixed interference space of the noise wave and noise wave, can realize the more optimal active noise reduction effect. Figure 2 It is the principle schematic diagram of the noise wave entering the air scoop, and the noise wave of the generator set in the air scoop interferes, and the noise wave amplitude reduces to reduce the noise of the generator set. Specific embodiment

[0024] As shown in the figure, a diesel generator set auxiliary silencer, the auxiliary silencer includes the mute box 01 connected with the generator set, the mute box is the combined body with the sound insulation capacity that a plurality of shell 11 constitutes, and a large amount of sound insulation cotton structure 21 is equipped in the inner wall of the mute box box body, and the air scoop 22 for the ventilation or heat dissipation of the generator set is equipped at the partial shell in the combined body, and the sound production device is installed in the air scoop vent, when the generator set works, the sound production device sends the noise wave of the generator set that can reduce the noise wave amplitude in the air scoop wind path.

[0025] The air scoop is the drawer-shaped air scoop, and a plurality of air scoops are arranged in parallel and form a plurality of convex structures at the inner wall of the mute box.

[0026] The drawer panel of the drawer-shaped air scoop is provided with the sound production device 25 on the side away from the generator set, and the sound wave processing device 24 is provided on the side towards the generator set,

[0027] The drawer entrance of the drawer-shaped air scoop is the noise input end, and the backboard of the drawer-shaped air scoop is the noise output end.

[0028] The backboard of the drawer-shaped air scoop is the grid format ventilation structure arranged at the box wall of the mute box, the sound wave output direction of the sound production device is towards the backboard of the drawer-shaped air scoop, and the sound wave collection device 23 is arranged at the backboard of the drawer-shaped air scoop.

[0029] The sound wave collection direction of the sound wave collection device is towards the drawer panel of the drawer-shaped air scoop, and the sound wave collection device is connected with the sound wave processing device 24 to output the generator set noise collected to the sound wave processing device.

[0030] The sound wave collecting device and the sound wave processing device are installed in the soundproof box.

[0031] The noise elimination sound wave is absorbed by the sound insulation cotton structure after entering the soundproof box.

[0032] The sound generating device is a directional sound generating loudspeaker device.

[0033] The sound generating device is an array device composed of a plurality of small loudspeakers.

[0034] The sound wave processing device is provided with a memory, the memory pre-stores the frequency needing noise elimination and the noise reduction target amplitude according to the sound wave spectrum characteristics of the generator set, and the sound wave processing device is connected with the sound generating device to control the output of the noise elimination sound wave.

[0035] When the noise elimination sound wave enters the air scoop, it interferes with the original noise sound wave of the generator set in the air scoop, so that the noise wave amplitude is reduced to eliminate the noise of the generator set. The noise elimination sound wave is an anti-phase sound wave corresponding to the sound wave spectrum of the source noise of the generator set, and the anti-phase sound wave has the same frequency and direction as the source noise but opposite phase.

[0036] Embodiment:

[0037] Preferably, an auxiliary noise elimination device for a generator set comprises a generator set soundproof box, the soundproof box is composed of a plurality of different housings, the housings are provided with sound insulation cotton, and part of the housings are air scoop structures, the air scoops are provided with a sound wave collecting device, a sound wave processing device and a sound generating device. When the generator set works, the noise will be transmitted to the outside through the air scoop ventilation opening, the sound wave collecting device collects the noise at the ventilation opening, the corresponding noise spectrum is obtained through the signal processing device of the sound wave processing device, and the specific frequency anti-phase sound wave is emitted through the sound generating device to interfere with the original noise sound wave to reduce the sound wave amplitude, so that the auxiliary noise reduction effect is achieved.

[0038] The sound wave signal collected by the sound wave collecting device can obtain the corresponding sound wave spectrum through the signal processing device, and the sound wave of the specified frequency and phase is emitted according to the spectrum characteristics. Further, the signal processing device obtains the noise spectrum information by performing Fourier transform on the original noise waveform, and further, the signal processing device determines the frequency band needing noise reduction through the factory predetermined spectrum characteristics of the generator set, and further, the signal processing device emits the sound wave of the specified frequency through the sound generating device, and forms a closed loop system through the feedback signal obtained by the sound wave collecting device, and the fixed frequency noise elimination effect can be achieved through continuous phase difference adjustment.

[0039] The sound wave processing device has predetermined the frequency to be eliminated according to the sound wave spectrum characteristics of the specific generator set before leaving the factory, and further, the sound wave processing device has predetermined the noise reduction target amplitude according to the specific sound emitting device before leaving the factory, so that in actual application, the sound wave processing device only needs to emit the sound wave signal of the specified frequency band according to the pre-setting after the generator set is stably running, and then the phase is adjusted through feedback to achieve the effect of noise elimination, thereby reducing the operation amount of the sound wave processing device.

[0040] The auxiliary noise elimination device takes the unit silencer as a whole and takes the noise conducted outward at the ventilation opening as the reduction target, simplifies the target sound field and reduces the sound field coupling when multiple auxiliary noise elimination devices work at the same time.

[0041] The sound emitting device can emit concentrated and directional sound field, and preferably, the sound emitting device can be combined by multiple small loudspeaker arrays.

[0042] Finally, it should be noted that: the above examples are used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that: the specific embodiments of the present application can still be modified or some technical features can be replaced by equivalent ones; without departing from the spirit of the technical scheme of the present application, all should be covered in the technical scheme range of the present application claimed by the present application.

Claims

1. A diesel generator set auxiliary muffling device, characterized by: The auxiliary noise elimination device comprises a soundproof box (01) connected with the generator set; the soundproof box is a combination with sound insulation capacity composed of multiple housings (11), the inner wall of the soundproof box is provided with a large number of sound insulation cotton structures (21), and part of the housings in the combination is provided with a wind scoop (22) for ventilation or heat dissipation of the generator set; the sound emission device is installed in the ventilation opening of the wind scoop; when the generator set works, the sound emission device emits a noise elimination sound wave capable of reducing the amplitude of the noise sound wave of the generator set in the ventilation opening.

2. The auxiliary silencing device for a diesel generating set according to claim 1, characterized in that: The wind scoop is a drawer-shaped wind scoop, multiple wind scoops are arranged in parallel and form multiple protruding structures at the inner wall of the soundproof box.

3. The auxiliary silencing device for a diesel generating set according to claim 2, characterized in that: The drawer panel of the drawer-shaped wind scoop is provided with the sound emission device (25) on the side away from the generator set, and is provided with the sound wave processing device (24) on the side towards the generator set, The drawer entrance of the drawer-shaped wind scoop is a noise input end, and the back plate of the drawer-shaped wind scoop is a noise output end. The back plate of the drawer-shaped wind scoop is a grid format ventilation structure arranged at the wall of the soundproof box, the sound wave output direction of the sound emission device is towards the back plate of the drawer-shaped wind scoop, and the back plate of the drawer-shaped wind scoop is provided with the sound wave collecting device (23).

4. The auxiliary silencing device for a diesel generating set according to claim 3, characterized in that: The sound wave collecting direction of the sound wave collecting device is towards the drawer panel of the drawer-shaped wind scoop, and the sound wave collecting device is connected with the sound wave processing device (24) to output the collected noise of the generator set to the sound wave processing device.

5. The auxiliary silencing device for a diesel generating set according to claim 3, characterized in that: The sound wave collecting device and the sound wave processing device are both installed in the soundproof box.

6. The auxiliary silencing device for a diesel generating set according to claim 1, characterized in that: The noise elimination sound wave is absorbed by the sound insulation cotton structure after entering the soundproof box.

7. The auxiliary silencing device for a diesel generating set according to claim 1, characterized in that: The sound emission device is a directional sound emission loudspeaker device.

8. The auxiliary silencing device for a diesel generating set according to claim 7, characterized in that: The sound emission device is an array device composed of multiple small loudspeakers.

9. The auxiliary silencing device for a diesel generating set according to claim 3, characterized in that: The sound wave processing device is provided with a memory, the memory pre-stores the frequency requiring noise elimination and the noise reduction target amplitude according to the sound wave spectrum characteristics of the generator set, and the sound wave processing device is connected with the sound emission device to control the output of the noise elimination sound wave.

10. The auxiliary silencing device for a diesel generating set according to claim 9, characterized in that: When the noise elimination sound wave enters the wind scoop, it interferes with the original noise sound wave of the generator set in the wind scoop, so that the amplitude of the noise wave is reduced to eliminate the noise of the generator set.

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