The present invention relates to a silencer, which includes an outer housing and a central perforated tube through which air flows. The present invention further relates to a vehicle engine including a silencer.
Small-displacement turbocharged engines are an important development in the direction of energy-efficient vehicles. A turbocharged engine improves the power and fuel economy of the vehicle, but also introduced a new problem of noise for an air inlet system, thereby severely impacting the rider's comfort of the vehicle. The howling generated by a turbocharger adopting a mechanical relief valve during instant operation belongs to typical broadband noises. A conventional silencer has a narrow silencing frequency range and cannot efficiently suppress this type of noise, and also has high cost and large size.
Perforated broadband silencers are widely applied in air inlet systems of turbocharged engines as excellent silencing elements meeting requirements of both silencing and mounting space, and each include a main tube and several annular resonance chambers. A desirable broadband silencing effect can be achieved by adjusting the width, diameter and number of the annular resonance chambers and the aperture and number of perforates.
When the perforated silencer is used in a turbocharged engine, the diameter of an air flow main tube depends on the tube diameter of the air inlet system, and the outer diameter of the annular resonance chamber is limited by the mounting space of an engine compartment. Therefore, the design of the perforated silencer having the expected silencing effect may be constrained in various terms including structure and size. Moreover, it is further required in practice that the perforated silencer has small flow loss.
However, the existing perforated silencer cannot, at times, achieve the expected silencing effect due to limitations such as the mounting space, and is complicated in structure and high in cost.
An objective of the present invention is to provide a silencer having a more compact structure and desirable broadband silencing effect and a corresponding vehicle engine.
According to a first aspect of the present invention, a silencer is provided, including: an outer housing; and a central perforated tube through which air flows; where the silencer further includes an additional perforated structure located between the central perforated tube and the outer housing; a first chamber is formed between the central perforated tube and the additional perforated structure; and the additional perforated structure is configured such that at least one second chamber is formed, which is at least partially located radially outside of the first chamber, wherein the second chamber is communicated with the first chamber by perforates.
According to an optional solution of the present invention, the additional perforated structure is configured as an additional perforated tube which is mounted over the central perforated tube.
According to an optional solution of the present invention, the additional perforated tube is disposed concentrically with the central perforated tube; and/or the additional perforated tube and/or the central perforated tube has circular cross section; and/or the first chamber and/or the second chamber has annular cross section.
According to an optional solution of the present invention, the central perforated tube is adapted to be connected to or integrally formed with a first end pipe section located axially outside of the outer housing, and the additional perforated tube is adapted to be connected to or integrally formed with a second end pipe section located axially outside of the outer housing, wherein the first end pipe section and the second end pipe section are located at axial opposite sides of the central perforated tube.
According to an optional solution of the present invention, the second chamber is configured so as to be completely located radially outside of the first chamber; and/or the second chamber and the first chamber have the same axial length and are aligned axially with each other.
According to an optional solution of the present invention, the second chamber is configured so as to only be in a partial circumferential region of the central perforated tube.
According to an optional solution of the present invention, the second chamber is configured as a box-shaped structure which has a radially-outward opening, and the outer housing has a cover plate adapted to close the opening.
According to an optional solution of the present invention, the first chamber and/or the second chamber is separated axially into a plurality of sub-chambers, communicated with each other via a perforated member.
According to an optional solution of the present invention, the silencer is adapted for use in an air inlet system of a vehicle engine; and/or the at least one second chamber comprises a plurality of second chambers which are located radially with respect to each other, and the adjacent second chambers are communicated with each other via perforates.
According to a second aspect of the present invention, an air inlet system of a vehicle engine is provided, where the air inlet system has the silencer.
The silencer of the present invention has a compact structure and better broadband silencing effect, especially when it is used in an air inlet system of a vehicle engine, the broadband noise of the air inlet system can be obviously suppressed.
According to this invention, the silencer and the air inlet system are not limited to an engine of a vehicle but also incorporate a silencer or an air inlet system for a stationary engine, e.g. a power generator. The invention is not limited to an exhaust gas turbo charged engine but also incorporates a silencer and an air inlet system for any other engine charged by other devices like mechanical compressors or electrical driven air chargers.
The present invention will be described in more detail below with reference to the accompanying drawings, and principles, characteristics and advantages of the present invention may be better understood. The accompanying drawings include:
In order for the technical problems to be solved, the technical solutions and beneficial technical effects of the present invention must be clear and more comprehensive. The present invention will be further described in detail through the accompanying drawings and multiple embodiments. It should be understood that the specific embodiments described herein are merely used to explain the present invention, and are not intended to limit the protection scope of the present invention.
As shown in
During use, an air inlet silencer is generally mounted on a main pipeline between an air cleaner and a turbocharger, or between the turbocharger and an intercooler. Preferably, the first perforated tube 3 is made to have a diameter equal to that of the main pipeline. As shown in
During mounting, the silencer 1 is embedded into a corresponding main pipeline through the first end pipe section 7 and the second end pipe section 8, or the first end pipe section 7 and the second end pipe section 8 are integrally formed with the main pipeline.
In view of the above, the intake silencer has two chambers communicated with each other in the radial direction, and the chambers, together with perforates in the first and second perforated tubes, form a Helmholtz resonance chamber structure. When the air flow passes through the first perforated tube, the Helmholtz resonance chamber structure may generate an attenuation effect on the broadband noise. As being proved by experiments, compared with the conventional perforated silencer having only one chamber in the radial direction, the perforated silencer having multiple chambers communicated with each other in the radial direction has a better silencing effect, especially having a desirable silencing effect for any frequency in a broad frequency band. Moreover, the silencer in such configuration is compact in structure and low in cost, and can be mounted in a limited space.
It is understandable that changes of parameters such as the aperture, the percentage of perforation, the length of the perforated tube and the chamber capacity may also affect the silencing effect to some extent, and the silencer may be further optimized based on these parameters in practice.
To simplify the structure and facilitate mounting, as shown in
Definitely, the first flange 31 may also be omitted, that is, the end of the first perforated tube 3 is directly pressed against the step 41.
The silencer needs three members in total, being simple in structure and convenient in mounting, thereby greatly reducing the manufacturing cost.
It should be noted that the silencer 1 shown in
On the other hand, the silencer 1 shown in
For a person skilled in the art, although the first chamber 5 and the second chamber 6 shown in
According to a preferred embodiment, the second chamber may be designed as a box-shaped structure. The box-shaped structure has a radially-outward opening and a cover plate for closing the opening. The cover plate is preferably connected to the opening by snapping, thereby simplifying mounting and manufacturing processes.
Moreover, according to the technical idea of the present invention, the first chamber 5 and the second chamber 6 may also have different axial lengths, and definitely, may also have different dimensions in other directions, as long as the first chamber and the second chamber are arranged at least partially in a radial position relation relative to each other.
To better understand the technical idea of the present invention,
In a) and b) of
It should be noted that
As shown in
For persons skilled in the art, the embodiment shown in
The basic idea of the perforated silencer of the present invention lies in that multiple chambers communicated with each other and arranged at least partially in a radial position relation relative to each other are provided at least in a partial circumferential region. By means of this structure, the silencer may achieve a better broadband silencing effect.
Although the perforated silencer is described by using a silencer for an air inlet system of a vehicle engine as an example, for persons skilled in the art, the perforated silencer definitely can be applied to other scenarios that require silencing the air flow.
Specific implementation manners of the present invention are described in detail here; however, they are provided merely for explanation, and should not be construed as limiting the scope of the present invention. Various replacements, variations and modifications may be conceived without departing from the spirit and scope of the present invention.
Number | Date | Country | Kind |
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2015 1 0436110 | Jul 2015 | CN | national |
This application is a continuation of International Application No. PCT/EP2016/065117, filed 29 Jun. 2016 and designating the United States, which claims the benefit of China Application No. CN 201510436110.7, filed 23 Jul. 2015. The entire contents of the aforesaid international application and the aforesaid China application being incorporated herein by reference.
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Number | Date | Country | |
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20180142588 A1 | May 2018 | US |
Number | Date | Country | |
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Parent | PCT/EP2016/065117 | Jun 2016 | US |
Child | 15875074 | US |