WO2008023941A1

WO2008023941A1 - Silencer for turbocharger

Info

Publication number: WO2008023941A1
Application number: PCT/KR2007/004034
Authority: WO
Inventors: Jai Yoon Shin
Original assignee: Ls Cable Ltd.
Priority date: 2006-08-23
Filing date: 2007-08-23
Publication date: 2008-02-28
Also published as: DE112007001929T5

Abstract

Disclosed is a silencer for a turbo charger provided between a first air supply pipe and a second air supply pipe. The silencer comprises a reduced pipe section extending from one end of the first air supply pipe and smaller than an inner diameter of the first air supply pipe. The reduced pipe section is formed with a plurality of air-holes and is inserted into the second air supply pipe to form a ring-shaped space together with the second air supply pipe.

Description

Description SILENCER FOR TURBOCHARGER

Technical Field

[1] The invention relates to a silencer for a turbo charger, and more particularly, to a silencer for a turbo charger, which is provided between a turbo charger and an in- tercooler to reduce noise generated in the turbo charger. Background Art

[2] A turbo charger of a typical diesel vehicle is an apparatus that feeds the air into an engine at pressures higher than the atmosphere to fill the engine in a large amount of the air. When increasing the injection of fuel in a state that the air is filled, the turbo charger can improve an output of the engine.

[3] Fig. 1 schematically shows a silencer that is connected between the conventional turbo charger and an intercooler.

[4] As shown in Fig. 1, a turbo charger 12 rotates a turbine with kinetic energy of the exhaust gas. The air is inhaled by an impeller connected to the turbine and the inhaled air is introduced into a cylinder with being pressured, i.e., supercharged.

[5] In the mean time, the pulsation occurs in the impeller, which is transferred to an intercooler 10 along air supply pipes 16, 18. The pulsation is amplified in a housing of the intercooler 10, so that the noise is higher.

[6] Regarding this, in order to reduce the noise generated by the pulsation, a silencer 14 is provided to the air supply pipes 16, 18 between the turbo charger 12 and the intercooler 10.

[7] Figs. 2 and 3 show a silencer adopted in Fig. 1, wherein Fig. 2 shows a silencer in which an inner pipe thereof is formed with air-holes and Fig. 3 shows a silencer in which an air-hole is not formed.

[8] In the followings, the conventional types of the silencer will be described with reference to Figs. 2 and 3.

[9] As shown in Fig. 2, a conventional silencer 14 comprises an outer pipe 20 and an inner pipe 22. The outer pipe 20 and the inner pipe 22 are connected while forming a ring-shaped space 24 therebetween. The inner pipe 22 is formed with one or more airholes 26. The outer pipe 20 is connected to the air supply pipes 16, 18. As the noise passes through the air-holes 26 and diffuses into the ring-shaped space 24, the silencer 14 destructively interferes the sounds, thereby reducing the noise.

[10] As shown in Fig. 3, a length of the inner pipe 28 connected to the outer pipe 20 is formed to be relatively shorter than the inner pipe 22 shown in Fig. 2 and one end of the inner pipe 28 communicates with the ring-shaped space 29. Thereby, the noise diffuses into the ring-shaped space 29, so that it is reduced.

[11] However, in the above silencer 14, the outer pipe 20 and the inner pipes 22, 28 are separately manufactured and the inner pipes 22, 28 should be fixed in the outer pipe 20 in a welding or fitting manner. Accordingly, the silencer 14 is manufactured by separate manufacturing and assembling, so that the number of assembling processes is increased and the cost is thus increased.

[12] In addition, since the silencer 14 made by assembling the outer pipe 20 and the inner pipes 22, 28 is inserted into the respective air supply pipes 16, 18, the assembly operation is burdened and much assembling time is consumed.

[13] Further, since the outer pipe 20 and the inner pipes 22, 28 of the silencer 14 are made of metal material, the size of the ring-shaped spaces 24, 29 or the length of the inner pipes 22, 28 should be lengthened so as to reduce the noise of the low frequency. As a result, the volume is inevitably larger. Disclosure of Invention Technical Problem

[14] The invention has been made to solve the above problems occurring in the prior art.

An object of the invention is to provide a silencer for a turbo charger, which can be easily manufactured and assembled to reduce the number of assembling processes and reduce the noise of low frequency while minimizing the volume. Technical Solution

[15] In order to achieve the above object, there is provided a silencer for a turbo charger provided between a first air supply pipe and a second air supply pipe, which comprises a reduced pipe section extending from one end of the first air supply pipe and smaller than an inner diameter of the first air supply pipe. The reduced pipe section is formed with a plurality of air-holes and is inserted into the second air supply pipe to form a ring-shaped space together with the second air supply pipe.

[16] In addition, fixing beads may be respectively formed along peripheries of both ends of the reduced pipe section and may be fittingly connected to an inner surface of the second air supply pipe.

[17] Further, according to the invention, there is provided a silencer for a turbo charger provided between a first air supply pipe and a second air supply pipe, which comprises a reduced pipe section extending from one end of the first air supply pipe and smaller than an inner diameter of the first air supply pipe. The reduced pipe section is inserted into the second air supply pipe to form a ring-shaped space together with the second air supply pipe, the space being opened in one direction.

[18] Moreover, in order to achieve the above object, there is provided a silencer for a turbo charger comprising an air supply pipe connecting a turbo charger and an in- tercooler; and a plate clip that is an elastic member fixed in the air supply pipe, is formed with a plurality of holes and presses an inner surface of the air supply pipe with being bent at plural points. [19] In addition, the plate clip may have a polygonal column structure that is bent at three or more points. [20] Additionally, the air supply pipe may be formed with two beads for preventing deviation at an interval corresponding to a length of the plate clip. At this time, the plate clip is located between the two beads, so that the plate clip is caught and thus fixed by the beads.

Advantageous Effects

[21] As described above, according to the invention, the silencer is integrally formed with the air supply pipe connected to the turbo charger and the silencer is fixed in the air supply pipe with the elastic force, so that the number of assembling processes relating to the manufacturing and assembling of the silencer is reduced and the assembly connection is quickly made. [22] In addition, according to the invention, it is possible to reduce the noise of low frequency, as compared to the metal silencer having a same volume.

Brief Description of the Drawings [23] FIG. 1 schematically shows a silencer that is connected between the conventional turbo charger and an intercooler. [24] FIGS. 2 and 3 show a silencer adopted in Fig. 1, wherein Fig. 2 shows a silencer in which an inner pipe thereof is formed with air-holes and Fig. 3 shows a silencer in which an air-hole is not formed. [25] FIG. 4 shows a silencer for a turbo charger according to a first embodiment of the invention. [26] FIG. 5 shows a silencer for a turbo charger according to a second embodiment of the invention. [27] FIG. 6 shows a silencer for a turbo charger having combined the silencers shown in

FIGS. 4 and 5. [28] FIG. 7 is a cross-sectional view showing a silencer for a turbo charger according to a third embodiment of the invention. [29] FIG. 8 is a longitudinal-sectional view of the silencer for a turbo charger shown in

FIG. 7.

[30] FIG. 9 is a perspective view showing a plate clip shown in FIG. 8.

[31] FIG. 10 is a perspective view showing a state in which elastic force of the plate clip shown in FIG. 9 is released. [32] FIG. 11 is a longitudinal-sectional view showing a silencer for a turbo charger according to a fourth embodiment of the invention.

[33] FIG. 12 is a sectional view showing various sectional shapes of a plate clip.

Mode for the Invention

[34] Hereinafter, a preferred embodiment of the present invention will be described with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

[35] Fig. 4 shows a silencer for a turbo charger according to a first embodiment of the invention, Fig. 5 shows a silencer for a turbo charger according to a second embodiment of the invention and Fig. 6 shows a silencer for a turbo charger having combined the silencers shown in FIGS. 4 and 5. The reference numerals same as those in Figs. 1 to 3 indicate the same members. Therefore, the descriptions thereof are omitted.

[36] Referring to Fig. 4, a reduced pipe section 36 is integrally formed with one end of a first air supply pipe 30 connected to a turbo charger 12, thereby forming a noise reducing section A. A pair of fixing beads 32, 34 are formed at positions spaced from both ends of the reduced pipe section 36 along peripheries thereof.

[37] An inner diameter dl of the noise reducing section A is smaller than an inner diameter Dl of the first air supply pipe 30. The reduced pipe section 36 is formed with one or more air-holes 38 in a regular or irregular arrangement.

[38] The reduced pipe section 36 of the first air supply pipe 30 is inserted into a second air supply pipe 40 connected to an intercooler. At this time, an outer periphery of the first air supply pipe 30 of the turbo charger 12 is closely contacted to an inner periphery of the second air supply pipe 40. Here, since the inner diameter dl of the reduced pipe section 36 is smaller than the inner diameter Dl of the first air supply pipe 30, a ring-shaped space 42 is naturally formed in the noise reducing section A. Thereby, as the prior art, the noise, which is generated and spread in the turbo charger 12, is diffused into the ring-shaped space 42 through the air-holes 38 to destructively interfere the sounds, so that the noise is reduced.

[39] The second air supply pipe 40 may be made of elastic material, such as rubber hose.

[40] Further, a structure in which one or more noise reducing sections A are sequentially formed is within the technical scope of the invention.

[41] Referring to Fig. 5, a reduced pipe section 46 is integrally formed with one end of a first air supply pipe 44 that is connected to a turbo charger 12 and is made of metal material, thereby forming a noise reducing section B. An inner diameter d2 of the reduced pipe section 46 is smaller than an inner diameter Dl of the first air supply pipe 44.

[42] When the reduced pipe section 46 of the first air supply pipe 44 is inserted into the second air supply pipe 40, a ring-shaped section 48 having one side opened is formed between the noise reducing section B and the second air supply pipe 40. Thereby, the noise is diffused into the ring-shaped space 48 through the reduced pipe section 46 of the first air supply section 44, so that the noise is reduced.

[43] In the mean time, all the silencers shown in Figs. 4 and 5 may be applied. Fig. 6 shows a structure in which the noise reducing section A having the air-holes formed and the noise reducing section B having no air-hole are respectively combined.

[44] In this case, the noise reducing sections A, B are sequentially formed, so that the noise reducing effect is further improved.

[45] When the silencer for a turbo charger of the invention is used, it is possible to remarkably reduce the assembling processes relating to the manufacturing and assembling of the outer pipe 20 and the inner pipes 22, 28 of the conventional silencer 14 and to reduce the manufacturing costs.

[46] In addition, in the silencer for a turbo charger of the invention, since the second air supply pipe is made of elastic material, such as rubber hose, the wave velocity in the ring-shaped spaces 42, 48 is lower, as compared to the conventional silencer 14 made of metal material. Therefore, it is possible to reduce the noise of low frequency with the smaller size, as compared to the conventional silencer 14.

[47] Fig. 7 is a cross-sectional view showing a silencer for a turbo charger according to a third embodiment of the invention, Fig.8 is a longitudinal- sectional view of the silencer for a turbo charger shown in FIG. 7, Fig. 9 is a perspective view showing a plate clip shown in FIG. 8 and Fig. 10 is a perspective view showing a state in which elastic force of the plate clip shown in FIG. 9 is released.

[48] As shown in Figs. 7 to 10, a silencer 100 for a turbo charger comprises a plate clip

120 that is located at the middle of an air supply pipe 110 extending from a turbo charger 12 to an intercooler 10.

[49] The plate clip 120 has a polygonal column structure formed by bending a plate having holes 121 at a plurality of points. In other words, the plate clip 120 is a polygonal column having hollows formed and is located in a longitudinal direction of the air supply pipe.

[50] In addition, the plate clip 120 is an elastic member. Therefore, it produces an unfolding elastic force at a bent state. By fitting the plate clip 120, which produces the unfolding force, at the middle of the air supply pipe 110, the elastic force of the plate clip 120 presses and pushes the inner surface of the air supply pipe 110, so that the plate clip 120 is fixed at the middle of the inside of the air supply pipe 110.

[51] Accordingly, in order to insert the plate clip 120 having an elastic force into the air supply pipe 110, the plate clip 120 is inserted into the air supply state 110 under state in which the force higher than the elastic force of the plate clip 120 is applied so that a sectional area of the plate clip 120 is reduced.

[52] When the plate clip 120 reaches a proper position of the air supply pipe 110, the force applied to the plate clip 120 is removed to elastically restore the plate clip 120. By doing so, as shown in Fig. 9, the plate clip 120 is elastically restored, so that it presses the inner surface of the air supply pipe 110 and is thus fixed.

[53] The air supply pipe of the third embodiment is made of flexible material. In case of the air supply pipe of flexible material, the air supply pipe is pressured by the elastic force of the plate clip, so that the plate clip is easily fixed. However, when the air supply pipe is made of metal material having a smooth inner surface, as a fourth embodiment, the frictional force is reduced, so that the plate clip is slipped in a longitudinal direction of the air supply pipe. Therefore, in case of the air supply pipe made of such material, a separate member is required so as to interrupt the movement of the plate clip.

[54] Like this, a silencer for a turbo charger according to a fourth embodiment is further provided with a member for interrupting the movement of the plate clip. In other words, the other constitutional elements are same as those of the third embodiment.

[55] Fig. 11 is a longitudinal-sectional view showing a silencer for a turbo charger according to a fourth embodiment of the invention; and Fig. 12 is a sectional view showing various sectional shapes of a plate clip.

[56] As shown in Fig. 11, in a silencer 100 for turbo charger, an air supply pipe 110 is formed with two beads 130 for preventing deviation at an interval corresponding to a length of the plate clip 120. The plate clip 120 inserted into the air supply pipe 110 is located between the two beads 130, so that it is prevented from being moved in a longitudinal direction of the air supply pipe 110.

[57] Therefore, in order to locate the plate clip 120 between the two beads 130, the plate clip 120 is inserted between the two beads 130 under state in which the plate clip 120 is contracted so that it is smaller than the inner diameter of a part in which the beads 130 are formed. After that, when the plate clip 120 is released, the plate clip 120 is restored to press the inner surface of the air supply pipe 110. Under such state, the plate clip 120 is caught by the beads 130, so that it cannot move in the longitudinal direction of the air supply pipe 110.

[58] In the mean time, as shown in Fig. 12, the plate clip 120 may be formed into a rectangular or star shape depending on the bending times and bending manners. In other words, the sectional shape of the plate clip 120 may be variously modified.

[59] While the invention has been shown and described with reference to certain preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made thereto without departing from the spirit and scope of the invention as defined by the appended claims. Industrial Applicability

[60] The silencer of the invention is connected to the turbo charger to reduce the noise and assembling processes relating to the manufacturing and assembling of the silencer, thereby enabling the rapid assembling connection.

Claims

[1] A silencer for a turbo charger provided between a first air supply pipe and a second air supply pipe, the silencer comprising: a reduced pipe section extending from one end of the first air supply pipe and smaller than an inner diameter of the first air supply pipe, wherein the reduced pipe section is formed with a plurality of air-holes and is inserted into the second air supply pipe to form a ring-shaped space together with the second air supply pipe.

[2] The silencer according to claim 1, wherein fixing beads are respectively formed along peripheries of both ends of the reduced pipe section and are fittingly connected to an inner surface of the second air supply pipe.

[3] A silencer for a turbo charger provided between a first air supply pipe and a second air supply pipe, the silencer comprising: a reduced pipe section extending from one end of the first air supply pipe and smaller than an inner diameter of the first air supply pipe, wherein the reduced pipe section is inserted into the second air supply pipe to form a ring-shaped space together with the second air supply pipe, the space being opened in one direction.

[4] A silencer for a turbo charger comprising: an air supply pipe connecting a turbo charger and an intercooler; and a plate clip that is an elastic member fixed in the air supply pipe, is formed with a plurality of holes and presses an inner surface of the air supply pipe with being bent at plural points.

[5] The silencer according to claim 4, wherein the plate clip has a polygonal column structure that is bent at three or more points.

[6] The silencer according to claims 4 or 5, wherein the air supply pipe is formed with two beads for preventing deviation at an interval corresponding to a length of the plate clip and the plate clip is located between the two beads, so that the plate clip is caught and thus fixed by the beads.