Noise reduction device for engine air inlet system

Abstract

The utility model discloses a noise reduction device for an engine air inlet system, which comprises a first connecting pipe and a resonant cavity shell connected with the first connecting pipe, a resonant cavity inner core is arranged in the resonant cavity shell, a plurality of air holes are formed in the resonant cavity inner core, and the resonant cavity shell and the resonant cavity inner core are matched to form a plurality of noise reduction cavities. The resonant cavity shell is provided with a fixed bracket and is connected with a second connecting pipe; the resonant cavity shell and the resonant cavity inner core are matched to form a plurality of noise reduction cavities, noise of different frequency bands is eliminated in a matched mode, the noise reduction effect is good, the noise reduction device has the advantages of being compact in structure, small in size and low in cost, and driving and riding comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile noise reduction, in particular to a noise reduction device for an engine intake system. Background Art

[0002] As the current society has become more and more strict on automobile exhaust emissions, vehicles with turbocharger intake systems are becoming more and more popular, and with it comes the noise generated by the supercharger blades rubbing against the air at high speed. In addition, during the high-speed rotation of the supercharger blades, vibrations will also be generated. This vibration is transmitted to the pipe wall between the supercharger and the intercooler, causing pipe vibration. When the frequency is close to the sound wave vibration frequency in the pipe, resonance will occur and radiate noise outward. These noises will be in the frequency range that the human ear is most sensitive to, seriously affecting the driving comfort.

[0003] There are currently three noise reduction methods for the noise generated by the turbocharger intake system, namely, the Helmtz resonant cavity, the 1 / 4 wavelength tube and the expansion resonant cavity. The Helmtz resonant cavity is limited to low-frequency noise, but it is large in size and is generally used on air filters; although the 1 / 4 wavelength tube has a good effect on medium and high frequency noise, to achieve this effect, the pipeline must be long enough, and it is difficult to install if the pipeline is too long; the expansion resonant cavity can eliminate medium and high frequency noise, and can eliminate noise in a single frequency band centered on a certain frequency. It can be used for gas noise reduction after turbocharging, but the frequency band is narrow and can only be targeted at a certain frequency band. Therefore, the noise reduction effect of the existing device is poor.

[0004] For example, Chinese patent CN201611011228.6 discloses an NVH noise reduction intake pipe for automobiles, which adopts a double-layer sandwich cavity plus a silencer hole structure to silence the gas, but its noise reduction effect is average. Summary of the invention

[0005] The utility model mainly solves the problem of poor noise reduction effect of an intake system of an automobile turbocharger in the prior art, and provides a noise reduction device for an intake system of an engine to improve the noise reduction effect.

[0006] The above technical problems of the utility model are mainly solved by the following technical solutions: a noise reduction device for an engine intake system, comprising a first connecting pipe and a resonance cavity shell connected to the first connecting pipe, a resonance cavity inner core is arranged inside the resonance cavity shell, the resonance cavity inner core is arranged with a plurality of air holes, the resonance cavity shell and the resonance cavity inner core cooperate to form a plurality of noise reduction chambers, a fixing bracket is installed on the resonance cavity shell, and the resonance cavity shell is connected to a second connecting pipe; the shape of the air hole is long strip.

[0007] Preferably, the pores are of different sizes.

[0008] Preferably, the plurality of noise reduction chambers include a main noise reduction chamber and a plurality of auxiliary noise reduction chambers.

[0009] Preferably, the first connecting tube comprises a first connecting light tube and a first assembly thread connected to the first connecting light tube, a first installation limit boss is provided between the first assembly thread and the first connecting light tube, and the first connecting light tube is welded to the resonant cavity shell via the first welding boss.

[0010] Preferably, the second connecting tube, the second connecting light tube and the second assembly thread connected to the second connecting light tube, a second installation limit boss is provided between the second assembly thread and the second connecting light tube, and the second connecting light tube is welded to the resonant cavity shell through the second welding boss.

[0011] Preferably, a rubber shock-absorbing pad is provided on the fixing bracket.

[0012] Preferably, a partition is provided on the inner core of the resonance cavity, and the partition is interference fit with the outer shell of the resonance cavity to form the noise reduction chamber.

[0013] Preferably, the volumes of the auxiliary noise reduction chambers are different.

[0014] The beneficial effects of the utility model are as follows: a plurality of noise reduction chambers are formed by cooperating between a resonant cavity shell and a resonant cavity inner core to eliminate noise in different frequency bands, thereby achieving good noise reduction effect, having the characteristics of compact structure, small size and low cost, and improving driving comfort. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural front view of an embodiment of the utility model.

[0016] Figure 2 It is an exploded view of an embodiment of the utility model.

[0017] Figure 3 It is a front view of the inner core of the resonant cavity of an embodiment of the utility model.

[0018] Figure 4 It is a side view of an inner core of a resonant cavity according to an embodiment of the utility model.

[0019] Figure 5 It is a structural diagram of the resonant cavity housing of an embodiment of the utility model.

[0020] In the figure, 1, the first connecting tube, 2, the second connecting tube, 3, the resonant cavity shell, 4, the fixed bracket, 201, the first connecting light tube, 202, the first assembly thread, 203, the first welding boss, 204, the first installation limit boss, 301, the resonant cavity shell body, 302, the first rubber shock-absorbing pad, 303, the first metal insert, 304, the first fixed bracket body, 305, the first resonant cavity welding boss, 306, the second resonant cavity welding boss, 307, the resonant cavity inner core, 308, the partition, 401, the second connecting light tube, 402, the second welding boss, 403, the wiring harness jack, 404, the second metal insert, 405, the second rubber shock-absorbing pad, 406, the second assembly thread, 407, the second fixed bracket body, 408, the second installation limit boss. DETAILED DESCRIPTION

[0021] The technical solution of the utility model is further specifically described below through embodiments and in conjunction with the accompanying drawings.

[0022] Embodiment 1:

[0023] like Figure 1-2 As shown, a noise reduction device for an engine intake system comprises a first connecting pipe 1, a resonance cavity, a fixing bracket 4 and a second connecting pipe 2, wherein one end of the first connecting pipe 1 is connected to a hose of an automobile intercooler and is sealed by clamping with a clamp, the other end of the first connecting pipe 1 is connected to the resonance cavity, the fixing bracket 4 is installed on the resonance cavity, the resonance cavity is connected to one end of the second connecting pipe 2, the other end of the second connecting pipe 2 is connected to an air outlet hose of a turbocharger of an automobile and is sealed by clamping with a clamp, and a wiring harness jack 403 is provided on the second connecting pipe 2.

[0024] The resonant cavity comprises a resonant cavity shell 3 and a resonant cavity core 307, as shown in FIG. Figure 3-4As shown, the resonant cavity inner core 307 is formed by integral injection molding, and the resonant cavity inner core 307 is arranged inside the resonant cavity shell 3, and is assembled together by coaxial interference fit of tooling, and the resonant cavity inner core 307 is provided with a plurality of air holes, and a partition 308 is arranged on the resonant cavity inner core 307, and the partition 308 and the resonant cavity shell 3 are interference fit to form a plurality of noise reduction chambers, and the noise reduction chambers include a main noise reduction chamber and a plurality of auxiliary noise reduction chambers, and because the partition 308 and the inner cavity wall of the resonant cavity shell 3 are completely fitted without gaps, the auxiliary noise reduction chambers are not connected to each other, and four auxiliary noise reduction chambers are used as an example in the utility model , starting from the side close to the intercooler, there are the first auxiliary noise reduction chamber, the second auxiliary noise reduction chamber, the third auxiliary noise reduction chamber and the fourth auxiliary noise reduction chamber, whose volumes decrease in sequence, and whose setting state can eliminate the noise of the first frequency band. Each auxiliary noise reduction chamber is provided with four air holes, and the air hole sizes of each auxiliary noise reduction chamber are different. The difference can be that the sizes of any air holes are different, or the air holes of the same auxiliary noise reduction chamber are the same, and the air holes of different auxiliary noise reduction chambers are different, or the air holes of the same auxiliary noise reduction chamber are different, and the air holes in the lateral position (i.e., along the extension direction of the resonance cavity) are the same.

[0025] like Figure 5 As shown, the resonant cavity shell 3 is formed by integral injection molding, and includes a resonant cavity shell body 301 and a first resonant cavity welding boss 305 and a second resonant cavity welding boss 306 arranged on the resonant cavity shell body 301. The first resonant cavity welding boss 305 and the first welding boss 203 of the first connecting tube 1 are welded together by vibration friction, and the second resonant cavity welding boss 306 and the second welding boss 402 of the second connecting tube 2 are welded together by vibration friction.

[0026] The first connecting tube 1 includes a first connecting light tube 201 and a first assembly thread 202 connected to the first connecting light tube 201 . A first installation limiting boss 204 is provided between the first assembly thread 202 and the first connecting light tube 201 . The first connecting light tube 201 is welded to the resonant cavity housing 3 via a first welding boss 203 .

[0027] The second connecting tube 2 includes a second connecting light tube 401 and a second assembly thread 406 connected to the second connecting light tube 401 . A second installation limiting boss 408 is provided between the second assembly thread 406 and the second connecting light tube 401 . The second connecting light tube 401 is welded to the resonant cavity shell 3 via the second welding boss 402 .

[0028] The tail ends of the two connecting pipes are designed with threads and boss structures, which is convenient for installing rubber hoses and clamps, so that the noise reduction device and the intercooler and turbocharger are connected and sealed.

[0029] The fixing bracket 4 includes a first fixing bracket body 304 fixedly connected to the resonant cavity housing 3 and a first rubber shock-absorbing pad 302 arranged on the first fixing bracket body 304 , and is fixedly connected to the vehicle body through a first metal insert 303 .

[0030] Embodiment 2

[0031] In order to improve the reliability and firmness of the installation of the device, the present embodiment is also provided with a fixing bracket 4 on the second connecting pipe 2, including a second fixing bracket body 407 fixedly connected to the second connecting pipe 2 and a second rubber shock-absorbing pad 405 provided on the second fixing bracket body 407, which is fixedly connected to the vehicle body through a second metal insert 404, thereby improving the stability of the installation of the device, preventing other noise caused by the vibration generated during the operation of the engine, and improving the noise reduction effect of the device.

[0032] Embodiment 3

[0033] like Figure 4 As shown, in this embodiment, the volumes of the first auxiliary noise reduction chamber, the second auxiliary noise reduction chamber, the third auxiliary noise reduction chamber and the fourth auxiliary noise reduction chamber are increased in sequence, and their setting state can eliminate the noise in the second frequency band.

[0034] Embodiment 4

[0035] In this embodiment, the volumes of the first auxiliary noise reduction chamber, the second auxiliary noise reduction chamber and the third auxiliary noise reduction chamber are the same, and the volume of the fourth auxiliary noise reduction chamber is the smallest. Its setting state can eliminate the noise in the third frequency band.

[0036] The above embodiments are merely examples of the settings for eliminating noise in conventional frequency bands. Based on the noise in other frequency bands to be eliminated, the volumes of the first sub-noise reduction chamber, the second sub-noise reduction chamber, the third sub-noise reduction chamber and the fourth sub-noise reduction chamber of the utility model can be adjusted and changed arbitrarily. At the same time, the air holes can also be adjusted and changed arbitrarily to achieve the purpose of eliminating the noise in this frequency band, thereby maximizing the noise elimination effect of the device.

[0037] The utility model sets up a plurality of mutually independent auxiliary noise reduction chambers under the main noise reduction chamber, which can reduce the engine intake noise and improve the NVH level of the automobile under the premise of meeting the transmission loss requirements of the noise reduction device and having a compact structure.

[0038] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A noise reduction device for an engine intake system, characterized in that: include: A first connecting tube and a resonant cavity shell connected to the first connecting tube, wherein a resonant cavity inner core is provided inside the resonant cavity shell, the resonant cavity inner core is provided with a plurality of air holes, the resonant cavity shell and the resonant cavity inner core cooperate to form a plurality of noise reduction chambers, a fixing bracket is installed on the resonant cavity shell, and the resonant cavity shell is connected to a second connecting tube; The air holes are in the shape of long strips. The plurality of noise reduction chambers include a main noise reduction chamber and a plurality of auxiliary noise reduction chambers. The auxiliary noise reduction chambers include four auxiliary noise reduction chambers, namely a first auxiliary noise reduction chamber, a second auxiliary noise reduction chamber, a third auxiliary noise reduction chamber and a fourth auxiliary noise reduction chamber.

2. A noise reduction device for an engine intake system according to claim 1, characterized in that: The pores have different sizes.

3. A noise reduction device for an engine intake system according to claim 1 or 2, characterized in that: The first connecting tube includes a first connecting light tube and a first assembly thread connected to the first connecting light tube, a first installation limiting boss is provided between the first assembly thread and the first connecting light tube, and the first connecting light tube is welded to the resonant cavity shell through the first welding boss.

4. A noise reduction device for an engine intake system according to claim 1 or 2, characterized in that: The second connecting tube includes a second connecting light tube and a second assembly thread connected to the second connecting light tube, a second installation limiting boss is provided between the second assembly thread and the second connecting light tube, and the second connecting light tube is welded to the resonant cavity shell through the second welding boss.

5. The noise reduction device for an engine intake system according to claim 1, characterized in that: A rubber shock-absorbing pad is arranged on the fixing bracket.

6. The noise reduction device for an engine intake system according to claim 1, characterized in that: A partition is arranged on the inner core of the resonance cavity, and the partition is interference-fitted with the outer shell of the resonance cavity to form the noise reduction chamber.

7. The noise reduction device for an engine intake system according to claim 1, characterized in that: The volumes of the auxiliary noise reduction chambers are different.

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