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Ventilatable silencing unit and ventilatable silencer

A sound-absorbing device and sound-absorbing technology, applied in the direction of sound-absorbing devices, ventilation systems, power plants, etc., can solve the problems of high manufacturing cost, complex overall structure, inability to effectively reduce the noise outside the car, etc., and achieve easy design and manufacture, and free size big effect

Inactive Publication Date: 2005-03-09
ISUZU MOTORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But, the problem that exists is: under the situation that utilizes blower fan 71 to blow cooling air from the ventilation channel 75 of front portion grille 73 to radiator 72 (water tank), even if soundproof cover 74 is set around engine compartment 72, there is still noise. A lot of noise is radiated from the air passage 75 of the front grille 73 to the outside of the car, which cannot effectively reduce the noise outside the car
[0009] However, the problem that arises is that in this muffler, the Helmholtz type muffler used is a resonator for a single frequency and cannot be applied to a wide frequency band. Noise with a generally uniform sound pressure distribution around and in front of the vehicle requires a muffler adapted to multiple frequencies
[0010] Therefore, it is necessary to set a Helmholtz resonator with different resonant frequencies for each independent air duct, that is, a different shape Helmholtz resonator. The problems that arise are: the overall structure is complicated and the manufacturing cost is high.
However, for noises such as engine noise that involves a wide frequency band starting from low frequencies, this muffler cannot fully exert its noise reduction effect anyway.

Method used

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  • Ventilatable silencing unit and ventilatable silencer
  • Ventilatable silencing unit and ventilatable silencer
  • Ventilatable silencing unit and ventilatable silencer

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0073] Figure 1 ~ Figure 3 The shown noise reduction unit 20 according to the first embodiment of the present invention has a box body 21 and a partition plate 22 parallel to the upper surface 21 u and the lower surface 21 d of the box body 21 . The partition plate 22 divides the case 21 into a ventilation section 23 and a noise reduction section 24 .

[0074] That is, the noise reduction unit 20 is formed by the box body 21 . The box-phase body 21 has: a ventilating portion 23 that can be ventilated, and a sound-absorbing portion 24 adjacent to the venting portion 23 through a partition plate 22 in the middle.

[0075] The vent part 23 is formed by a ventilating passage 23c, surrounded by side wall panels 21s, 21s and an upper surface 21a of the box body 21, and has openings 23a, 23b at the front and rear of the box body 21.

[0076] A sufficient ventilation function can be ensured by having this ventilation path 23c. Furthermore, by adjusting the ratio of the cross-secti...

no. 2 Embodiment

[0082] The following instructions Figure 4 ~ Figure 5 Since the structure of the vent part 33 of the second embodiment of the noise reduction unit 30 is the same as that of the first embodiment, its description will be omitted, and only the different part of the noise reduction part 34 will be described.

[0083] Figure 4 ~ Figure 6 In the shown second embodiment of the present invention, the noise reduction unit 30 of the noise reduction unit 30 is closed in the front and rear directions of the box 31 by a front wall plate 31f and a rear wall plate 31b, and is formed by a plurality of partition plates 35a, 35b, and 35c. A plurality of silencer channels 34a-34d with different channel lengths La3, Lb3, Lc3 are provided.

[0084] And, these noise reduction passages 34 a to 34 d communicate with the ventilation passage 33 c through the openings 32 a to 32 d provided in the partition plate 32 . In this way, the branch-type sound-absorbing passages 34a, 34b opened at only one e...

no. 3 Embodiment

[0088] The following instructions Figure 7 ~ Figure 9 The noise reduction unit 40 of the third embodiment. Since the structure of the ventilation part 43 is the same as that of the first embodiment, its description is omitted, and only the noise reduction part 44 which is a different part will be described.

[0089] Figure 7 ~ Figure 9 The sound-absorbing part 44 of the sound-absorbing unit 40 of the third embodiment shown uses the front wall plate 41f and the rear wall plate 41b to seal the passage in the front and rear directions of the box body 41, and uses the partition wall plate 45 to form different passage lengths La4 and Lb4. A plurality of noise reduction channels 44a, 44b. In addition, openings 42a to 42d are provided on the partition plate 42a as the opening ends of the silencing passages 44a and 44b to the air passage 43c, thus forming resonance-type silencing passages 44a and 44b with openings at both ends. Partition plates 46a to 46e for channel extension ar...

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PUM

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Abstract

A box type silencer unit 20 includes a ventilation portion 23, a silencer portion 24 adjacent to said ventilation portion 23 and a dividing partition 22 located between said ventilation portion 23 and said silencer portion 24. The ventilation portion 23 is formed of a ventilating passage 23c opened through front end and back end of said box body 21. The silencer portion 24 is formed by closing front end and back end of said box body 21 and includes at least one partition plate to make a plurality of silencing passages 24a and 24b of different length La2 and Lb2. Each of said silencing passages 24a and 24b communicates with said ventilation passage 23c through at least one opening 22a to 22d formed in said dividing partition 22 and at least one 24b of those silencing passages 24a and 24b is provided with at least one passage extending partition 26a and 26b to extend the length of said silencing passage. This device can be applied to such a portion, e.g., the front grille or bumper of an automobile as cannot take a large area in front of the ventilation or a depth in the ventilating direction.

Description

technical field [0001] The present invention relates to a ventilated silencing unit and a ventilated silencing device having, for example, a ventilation function for allowing cooling air to flow into an automobile engine and a silencing function for eliminating noise scattered from an engine room or the like. Background technique [0002] Cars, trucks, buses and other car noise can be roughly divided into: the noise inside the car felt by the driver and passengers, and the outside noise felt by people outside the car. From the perspective of improving product performance and preventing noise pollution, each anti-noise countermeasures. [0003] The noise outside the vehicle is roughly classified into engine noise, drive system noise, exhaust system noise, and tire noise depending on the source of the noise. Moreover, in addition to the mechanical noise generated by the engine body, the engine noise also includes the noise of the air intake system and the noise of the cooling...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60K11/04F01N1/02F02M35/12F02M35/16G10K11/16
CPCY10S454/906F02M35/10013F02M35/16F02M35/12F02M35/1261F02M35/1288
Inventor 中村政弘
Owner ISUZU MOTORS LTD