Exhaust device

Abstract

To suppress leakage of exhaust gas while securing water discharge capacity in an exhaust device with an exhaust pipe.SOLUTION: An exhaust device includes an exhaust pipe, a cover member and a holding member. The exhaust pipe is configured so that exhaust gas is introduced to inside, and a communication hole for communicating inside and outside of the exhaust pipe is formed. The cover member is constituted by a flexible porous material and is configured to cover the communication hole and cover at least part of an outer peripheral part of the exhaust pipe. The holding member holds the cover member with respect to the exhaust pipe with at least a part of the cover member coming into contact with outside air and with the cover member pressed from the outer peripheral side.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to an exhaust device including an exhaust pipe.

Background Art

[0002] For example, Patent Document 1 below discloses a technique of covering the periphery of a hole formed in an exhaust pipe with a porous body such as glass wool.

Prior Art Document

Patent Document

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in an exhaust device including an exhaust pipe, moisture such as condensed water is generated inside the exhaust pipe. When a hole for discharging moisture is provided in the exhaust pipe, exhaust is likely to leak from the exhaust pipe. One aspect of the present disclosure is to enable suppression of exhaust leakage while ensuring drainage ability in an exhaust device including an exhaust pipe.

Means for Solving the Problems

[0005] One aspect of the present disclosure is an exhaust device including an exhaust pipe, a cover member, and a holding member. The exhaust pipe is configured such that exhaust is introduced therein, and a communication hole that communicates the inside and outside of the exhaust pipe is formed. The cover member is made of a porous material having flexibility, covers the communication hole, and is configured to cover at least a part of the outer peripheral portion of the exhaust pipe. The holding member holds the cover member between the cover member and the exhaust pipe in a state where at least a part of the cover member is in contact with the outside air and the cover member is pressed from the outer peripheral side.

[0006] According to such a configuration, condensed water is discharged from the communication holes, and when it touches the cover member which is a porous material, the condensed water is favorably absorbed by the cover member due to capillary action. Therefore, the drainage capacity can be improved. Further, the cover member is pressed from the outside by the holding member and compressed, so that its density is increased. Therefore, since the ventilation resistance in the cover member becomes high, leakage of exhaust air from the communication holes can be suppressed.

[0007] In one aspect of the present disclosure, the cover member may include an extension portion configured to extend in a direction away from the exhaust pipe. According to such a configuration, it is possible to configure the extension portion so that the flow of outside air such as running wind easily hits it. Therefore, evaporation of condensed water from the cover member can be promoted, and the drainage capacity can be improved.

[0008] In one aspect of the present disclosure, the extension portion may extend vertically downward from the outer peripheral surface of the holding member. According to such a configuration, the condensed water can be guided to the tip side of the extension portion by the action of gravity applied to the extension portion. Therefore, it is possible to make it easier to absorb new condensed water in the vicinity of the communication holes.

[0009] In one aspect of the present disclosure, the communication holes and the cover member may be arranged at a portion where the exhaust pipe curves vertically upward as it goes downstream in the flow direction. According to such a configuration, good drainage can be performed at a place where condensed water easily accumulates.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0011] Hereinafter, exemplary embodiments of the present disclosure will be described with reference to the drawings. [1. Embodiment] [1-1. Configuration of Exhaust Device] The exhaust device 1A shown in FIGS. 1A, 1B, and 1C is a device having a function of allowing exhaust to flow through. Note that FIG. 1B is a cross-sectional view of the exhaust device 1A cut by a virtual plane parallel to the exhaust flow direction and parallel to the vertical direction. The exhaust device 1A is mounted on a moving body (for example, a vehicle such as a passenger car) having an internal combustion engine such as an engine.

[0012] In FIGS. 1 and the like, the upper vertical direction is shown as "UP", the lower vertical direction is shown as "DOWN", and the exhaust flow direction is shown as "FLOW". The exhaust flow direction indicates the direction in which the main exhaust flows downstream inside the exhaust pipe 10A, and is, for example, rightward in FIG. 1B. The upstream side is the side opposite to the downstream side.

[0013] The exhaust device 1A includes an exhaust pipe 10A, a cover member 30A, and a holding member 50A. The exhaust pipe 10A is a cylindrical member that forms a flow path through which exhaust flows inside, and is configured such that exhaust is introduced into this flow path. Note that the exhaust pipe 10A is shown in a partially cut-out state, and other pipes communicating with the exhaust pipe 10A are connected to the upstream side and the downstream side of the exhaust pipe 10A and used. The exhaust pipe 10A is, for example, a metal pipe made of stainless steel or the like.

[0014] A communication hole 11A that communicates the inside and outside of the exhaust pipe 10A is formed in the outer peripheral portion 12 (i.e., the circumferential surface) of the exhaust pipe 10A. The communication hole 11A opens downward in the vertical direction in the exhaust pipe 10A and functions as a hole for draining moisture W such as condensed water. Note that the communication hole 11A may be arranged at any position on the side surface of the exhaust pipe 10A as long as it is arranged at a position where moisture W such as condensed water can be drained. For example, the communication hole 11A may be arranged at any position in the lower side in the vertical direction of the exhaust pipe 10A (i.e., the portion below the center of the exhaust pipe 10A in the vertical direction). The shape of the communication hole 11A is, for example, circular in plan view.

[0015] A part of the outer peripheral portion 12 of the exhaust pipe 10A along the exhaust flow direction is covered by the cover member 30A. Further, the outer peripheral surface of the cover member 30A is covered by a cylindrical holding member 50A.

[0016] Note that the cover member 30A is configured such that a part of the cover member 30A comes into contact with the outside air. Specifically, the cover member 30A is configured such that each of the upstream side and the downstream side surfaces in the flow direction, and the extension portion 32 described below come into contact with the outside air.

[0017] The cover member 30A includes an extension portion 32. The extension portion 32 is configured to extend in a direction away from the exhaust pipe 10A. In particular, the extension portion 32 extends so as to hang downward in the vertical direction from the outer peripheral surface of the holding member 50A.

[0018] As shown in FIG. 2A, the cover member 30A in the deployed state is configured as a sheet-like body in which a substantially rectangular cover main body 31 and an extension portion 32 are integrated. The extension portion 32 protrudes partially from one end surface of the cover main body 31 and is configured to be line-symmetric with respect to the center line L. The center line L is parallel to the flow direction and is a line indicating the center of the cover main body 31.

[0019] The cover member 30A is made of a flexible porous material. The porous material refers to a material, substance, or structure in which capillary action can occur. The porous material may include, for example, glass fibers such as glass wool, ceramic fibers, silica fibers, and steel fibers such as steel wool. The porous material has heat resistance sufficient to withstand the heat of the exhaust gas. As long as it has flexibility, ceramics, pumice, etc. can also be adopted for the cover member 30A.

[0020] Having flexibility means that the density increases when pressed. That is, while the thickness of the cover member 30A not being pressed is T0 as shown in FIG. 2B, the thickness of the cover member 30A pressed by the holding member 50A is T1 which is smaller than T0 as shown in FIG. 1B. Therefore, the flexible cover member 30A has an increased density when pressed, and for this reason, the ventilation resistance increases and it becomes difficult for the exhaust gas to leak from the communication hole 11A. That is, the airtightness in the exhaust pipe 10A is improved.

[0021] As shown in FIG. 3A, the cover member 30A is wound around the exhaust pipe 10A. At this time, the cover member 30A is configured to cover the entire circumference of the outer peripheral portion 12 of the exhaust pipe 10A while covering the communication hole 11A of the exhaust pipe 10A. In other words, the cover member 30A is configured to continuously cover the outer peripheral portion 12 over the entire circumference.

[0022] Further, the cover member 30A is arranged surrounding the outer peripheral portion 12 of the exhaust pipe 10A such that the communication hole 11A is located at the center in the flow direction of the exhaust gas in the cover member 30A. That is, the cover member 30A is configured to extend upstream and downstream in the flow direction of the exhaust gas from the communication hole 11A.

[0023] The cover member 30A is wound around the exhaust pipe 10A in a state where the extending portion 32 is positioned directly below the exhaust pipe 10A, and a connecting portion 33 is formed where the end faces are connected directly above the exhaust pipe 10A. The connecting portion 33 is set at a position that does not overlap with the communication hole 11A. Note that the cover member 30A does not necessarily need to cover the entire circumference of the outer peripheral portion 12, and may be configured to cover at least a part of the outer peripheral portion 12 of the exhaust pipe 10A while covering the communication hole 11A.

[0024] The holding member 50A is formed in a cylindrical shape in advance, for example, as shown in FIG. 3B. The holding member 50A is made of a metal such as stainless steel, for example. The inner diameter of the holding member 50A is set to be slightly smaller than the outer diameter of the member obtained by winding the cover member 30A around the exhaust pipe 10A as shown in FIG. 3A.

[0025] Into such a holding member 50A, the exhaust pipe 10A and the cover member 30A shown in FIG. 3A are press-fitted into the cylindrical interior from the end faces. In this way, the exhaust device 1A shown in FIG. 1A is obtained. Note that the holding member 50A does not necessarily need to be formed in a cylindrical shape in advance, and a plate-like member may be wound around the cover member 30A and then joined so as to form a cylindrical shape. Also, the holding member 50A may cover only a part of the periphery of the cover member 30A, but in this case, it is preferably arranged so as to cover the communication hole 11A via the cover member 30A.

[0026] The above-described exhaust device 1A may be arranged in the exhaust pipe bending portion 3, as shown in FIGS. 4A and 4B. The exhaust pipe bending portion 3 is a portion where the exhaust pipes 10B and 10C bend vertically upward as they go downstream in the flow direction. That is, the exhaust pipe bending portion 3 is a place where moisture such as condensed water tends to accumulate.

[0027] As shown in FIG. 4A, the exhaust pipe bent portion 3 may be a part of the exhaust pipe 10B, and may be a portion that curves downward in the vertical direction and then curves upward in the vertical direction as it goes downstream in the flow direction. In this case, the extending portion 32 is configured to once go upward in the vertical direction as it goes downstream in the flow direction, but to move away from the exhaust pipe 10B. The extending portion 32 goes downward in the vertical direction as it goes further downstream. And the tip of the extending portion 32 may be located vertically below the downstream end of the holding member 50A. Alternatively, at least a part of the extending portion 32 may be located vertically below the lower end on the downstream end surface in the flow direction of the cover member 30A.

[0028] Further, as shown in FIG. 4B, the exhaust pipe bent portion 3 may be a portion on the downstream side in the flow direction of the horizontally extending exhaust pipe 10C, and may be a portion that curves upward in the vertical direction. In this case, the extending portion 32 is configured to move downward in the vertical direction while moving away from the exhaust pipe 10B as it goes downstream in the flow direction.

[0029] [1-2. Effect] According to the embodiment described in detail above, the following effects are achieved. (1a) One aspect of the present disclosure is an exhaust device 1A including an exhaust pipe 10A, a cover member 30A, and a holding member 50A. The exhaust pipe 10A is configured such that exhaust is introduced therein, and a communication hole 11A that communicates the inside and outside of the exhaust pipe 10A is formed on the peripheral surface of the exhaust pipe 10A. The cover member 30A is made of a porous material having flexibility, covers the communication hole 11A, and is configured to cover at least a part of the outer peripheral portion 12 of the exhaust pipe 10A. The holding member 50A holds the cover member 30A between the exhaust pipe 10A in a state where at least a part of the cover member 30A is in contact with the outside air and in a state where the cover member 30A is pressed from the outer peripheral side.

[0030] According to such a configuration, condensed water is discharged from the communication hole 11A, and when it touches the cover member 30A which is a porous material, the condensed water is favorably absorbed by the cover member 30A due to capillary action. Therefore, the drainage ability can be improved. Further, the cover member 30A is pressed from the outside by the holding member 50A and compressed, so that its density is increased. Therefore, since the ventilation resistance in the cover member 30A becomes high, leakage of exhaust air from the communication hole 11A can be suppressed.

[0031] (1b) In one aspect of the present disclosure, the cover member 30A includes an extension portion 32 configured to extend in a direction away from the exhaust pipe 10A. According to such a configuration, the flow of outside air such as traveling wind can be easily made to hit the extension portion 32. Therefore, evaporation of condensed water from the cover member 30A can be promoted, and the drainage ability can be improved.

[0032] (1c) In one aspect of the present disclosure, the extension portion 32 is configured to extend vertically downward from the outer peripheral surface of the holding member 50A. According to such a configuration, the condensed water can be guided to the tip side of the extension portion 32 by the action of gravity applied to the extension portion 32. Therefore, it is possible to facilitate absorption of new condensed water in the vicinity of the communication hole 11A.

[0033] (1d) In one aspect of the present disclosure, the communication hole 11A and the cover member 30A are arranged at a portion where the exhaust pipe 10A curves vertically upward toward the downstream side in the flow direction. According to such a configuration, good drainage can be performed at a place where condensed water tends to accumulate.

[0034] [2. Other Embodiments] As described above, the embodiments of the present disclosure have been described. However, the present disclosure is not limited to the above-described embodiments and can be implemented with various modifications.

[0035] (2a) In the above-described embodiment, the upstream surface of the cover member 30A in the flow direction is configured to be in contact with the outside air, but it is not limited thereto. For example, as in the exhaust device 1B of the first modification shown in FIG. 5A, the holding member 50B may be configured to include a closing portion 55. The closing portion 55 is a member that closes the gap between the holding member 50B and the exhaust pipe 10A at the upstream end of the holding member 50B and is fixed to the exhaust pipe 10A.

[0036] The closing portion 55 has a function of preventing the upstream surface of the cover member 30A from coming into contact with the outside air. However, the cover member 30A is configured such that the downstream surface in the flow direction and the extending portion 32 are in contact with the outside air. According to such a configuration, since the holding member 50B is fixed to the exhaust pipe 10A, displacement of the holding member 50B due to vibration or the like can be suppressed.

[0037] (2b) In the above-described embodiment, the extending portion 32 of the cover member 30A is configured to be line-symmetric with respect to the center line L of the cover main body portion 31, but it is not limited thereto. For example, as in the cover member 30B of the second modification shown in FIG. 5B, the extending portion 32 may be disposed at a position offset from the center line L of the cover main body portion 31. Even with such a configuration, drainage can be performed satisfactorily.

[0038] (2c) In the above-described embodiment, the extending portion 32 of the cover member 30A is configured to protrude from the end of the holding member 50A, but it is not limited thereto. For example, as in the exhaust device 1C of the third modification shown in FIGS. 6A, 6B, and 6C, the exhaust pipe 10A may be configured to be covered over a wider range by the cover member 30C and the holding member 50C. Specifically, in the exhaust device 1C, on the outer peripheral surface of the portion of the exhaust pipe 10A where the extending portion 32 is present, the outer peripheral surface other than the portion where the extending portion 32 is located is configured to be covered by the cover member 30C and the holding member 50C.

[0039] More specifically, as shown in FIG. 6B, the cover member 30C includes two cover extension portions 34 on both sides of the extension portion 32 along the center line L. The cover extension portions 34 are configured to protrude by the same length as the extension portion 32 from the same end surface of the cover main body portion 31 where the extension portion 32 protrudes.

[0040] Further, as shown in FIG. 6C, the holding member 50C includes a holding main body portion 51 and two holding extension portions 52. The holding main body portion 51 is a portion that covers the outer peripheral surface of the cover main body portion 31 and has substantially the same shape and size as the cover main body portion 31. The two holding extension portions 52 are portions that cover the outer peripheral surfaces of the two cover extension portions 34 and have substantially the same shape and size as the two cover extension portions 34. In the holding member 50C, a notch portion 53 as a space where the member is cut out is disposed at a portion corresponding to the extension portion 32 of the cover member 30C. That is, the holding member 50C is configured not to be disposed around the extension portion 32.

[0041] By assembling these cover member 30C and holding member 50C around the exhaust pipe 10A, the exhaust device 1C is obtained. According to such a configuration, a wider range of the outer peripheral surface of the exhaust pipe 10A can be covered by the cover member 30C and the holding member 50C, so that the heat insulation property and the sound insulation performance of the exhaust pipe 10A can be further improved.

[0042] (2d) In the above embodiment, the exhaust pipe 10A is configured to be circular in a cross section perpendicular to the flow direction, but is not limited thereto. For example, the exhaust pipe 10D of the exhaust device 1D of the fourth modification shown in FIG. 7 may be provided. Most of the exhaust pipe 10D is a curved surface that is a part of a circle, and a part thereof is formed to be a plane F. The plane F portion of the exhaust pipe 10D is disposed downward in the vertical direction, and the extension portion 32 of the cover member 30A is disposed along the plane F. The holding member 50D is formed in accordance with the shape of the exhaust pipe 10D.

[0043] According to such a configuration, since the extension portion 32 is disposed along the plane F portion of the exhaust pipe 10D, the extension portion 32 can be disposed without being bent.

[0044] (2e) In the above embodiment, a plurality of functions of one component may be realized by a plurality of components, or one function of one component may be realized by a plurality of components. Also, a plurality of functions of a plurality of components may be realized by one component, or one function realized by a plurality of components may be realized by one component. Further, a part of the configuration of the above embodiment may be omitted. Also, at least a part of the configuration of the above embodiment may be added to or replaced with the configuration of other above embodiments.

[0045] (2f) In addition to the exhaust devices 1A to 1D described above, the present disclosure can also be realized in various forms such as a system having the exhaust devices 1A to 1D as components.

Explanation of Reference Numerals

[0046] 1A to 1D... Exhaust devices, 3... Exhaust pipe bending portion, 10A to 10D... Exhaust pipes, 11A... Communication hole, 12... Outer peripheral portion, 30A to 30C... Cover members, 31... Cover main body portion, 32... Extension portion, 33... Connection portion, 34... Cover extension portion, 50A to 50D... Holding members, 51... Holding main body portion, 52... Holding extension portion, 53... Notch portion, 55... Blocking portion.

Claims

1. An exhaust system comprising: The exhaust pipe, the cover member, and the holding member are provided. the exhaust pipe is configured to introduce exhaust gas into the interior thereof, and a communication hole is formed to communicate the inside and outside of the exhaust pipe; the cover member is made of a flexible porous material and is configured to cover the communication hole and to cover at least a portion of an outer periphery of the exhaust pipe, The holding member holds the cover member between the exhaust pipe and the cover member while pressing the cover member from the outer periphery side with at least a portion of the cover member in contact with outside air. An exhaust system configured as follows.

2. 2. The exhaust system of claim 1, The cover member includes an extension portion configured to extend in a direction away from the exhaust pipe; An exhaust system comprising:

3. 3. The exhaust system according to claim 2, The extension portion extends vertically downward beyond the outer circumferential surface of the holding member. An exhaust system configured as follows.

4. The exhaust system according to any one of claims 1 to 3, The communication hole and the cover member are disposed at a portion where the exhaust pipe curves vertically upward toward the downstream side in the exhaust flow direction. Exhaust system.

Images