JP2020041441A - Catalyst device - Google Patents
Catalyst device Download PDFInfo
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- JP2020041441A JP2020041441A JP2018167662A JP2018167662A JP2020041441A JP 2020041441 A JP2020041441 A JP 2020041441A JP 2018167662 A JP2018167662 A JP 2018167662A JP 2018167662 A JP2018167662 A JP 2018167662A JP 2020041441 A JP2020041441 A JP 2020041441A
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- exhaust pipe
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Abstract
Description
本発明は、排気管からの輻射熱を遮る遮熱板を備えた触媒装置に関する。 The present invention relates to a catalyst device provided with a heat shield plate that blocks radiant heat from an exhaust pipe.
従来、内燃機関の排気通路に設けられて排気の浄化を行う触媒装置が周知である。特許文献１には、排気管からの輻射熱を遮る遮熱板が排気管に取り付けられている触媒装置が開示されている。この触媒装置では、排気管と遮熱板との間の隙間に吸音材が充填されている。 BACKGROUND ART Conventionally, a catalyst device that is provided in an exhaust passage of an internal combustion engine and purifies exhaust gas is well known. Patent Literature 1 discloses a catalyst device in which a heat shield that blocks radiant heat from an exhaust pipe is attached to the exhaust pipe. In this catalyst device, the gap between the exhaust pipe and the heat shield plate is filled with a sound absorbing material.
排気管と遮熱板との間の隙間に吸音材が充填されていると、排気管の振動が排気管の表面全体から吸音材を介して遮熱板に伝達される。これにより、遮熱板の振動が発生するおそれがあった。一方、吸音材を設けない部分があると、その部分で排気管が振動して放射音が発生する問題があった。 When the gap between the exhaust pipe and the heat shield is filled with the sound absorbing material, the vibration of the exhaust pipe is transmitted from the entire surface of the exhaust pipe to the heat shield via the sound absorbing material. As a result, vibration of the heat shield plate may be generated. On the other hand, if there is a portion where the sound absorbing material is not provided, there is a problem that the exhaust pipe vibrates at that portion and radiated sound is generated.
上記課題を解決するための触媒装置は、触媒を格納している排気管と、前記排気管との間に隙間を有して設けられた遮熱板と、前記排気管の前記触媒に接している部分と前記遮熱板との間の隙間に設けられた空気層と、前記排気管の前記触媒に接していない部分と前記遮熱板との間の隙間に設けられた吸音材と、を備える触媒装置。 A catalyst device for solving the above problem is an exhaust pipe that stores a catalyst, a heat shield plate provided with a gap between the exhaust pipe, and a catalyst in contact with the catalyst of the exhaust pipe. An air layer provided in a gap between the portion and the heat shield plate, and a sound absorbing material provided in a gap between the portion of the exhaust pipe not in contact with the catalyst and the heat shield plate. Equipped catalyst device.
この構成によれば、空気層が設けられた部分では、排気管の振動が吸音材を介して遮熱板に伝達されることがない。したがって、排気管の振動が遮熱板に伝達し難くなる。また、排気管の触媒に接している部分は、触媒によって振動が減衰されるため、発生する振動が排気管の他の部分よりも小さい。したがって、排気管の触媒と接している部分と遮熱板との間の隙間に空気層を設けることに起因する放射音の増大は抑制される。 According to this configuration, in the portion where the air layer is provided, the vibration of the exhaust pipe is not transmitted to the heat shield through the sound absorbing material. Therefore, it becomes difficult for the vibration of the exhaust pipe to be transmitted to the heat shield plate. In addition, since the vibration of the portion of the exhaust pipe that is in contact with the catalyst is attenuated by the catalyst, the generated vibration is smaller than other portions of the exhaust pipe. Therefore, an increase in radiated sound caused by providing an air layer in a gap between a portion of the exhaust pipe in contact with the catalyst and the heat shield plate is suppressed.
触媒装置の一実施形態について、図１に従って説明する。
図１に示すように、内燃機関のシリンダヘッド１０には、触媒装置１１が連結されている。触媒装置１１は、排気が流れる排気管２０を備える。排気管２０は、順に接続された湾曲管部２１、拡径部２２、格納部２３、縮径部２４、及び直管部２５を含む。湾曲管部２１は、シリンダヘッド１０に連結されているとともに、鉛直下方（図１の下方）に向けて湾曲している。拡径部２２は、湾曲管部２１から離間するほど径が大きくなる。格納部２３は、内部に触媒２６を格納している。縮径部２４は、格納部２３から離間するほど径が小さくなる。直管部２５は、一端に縮径部２４が連結され、他端に図示しない排気系部材が連結されている。拡径部２２、格納部２３、および縮径部２４は、触媒を格納している排気管の一例である。
One embodiment of the catalyst device will be described with reference to FIG.
As shown in FIG. 1, a catalyst device 11 is connected to a cylinder head 10 of an internal combustion engine. The catalyst device 11 includes an exhaust pipe 20 through which exhaust gas flows. The exhaust pipe 20 includes a curved pipe part 21, an enlarged diameter part 22, a storage part 23, a reduced diameter part 24, and a straight pipe part 25 connected in order. The bending tube portion 21 is connected to the cylinder head 10 and curves vertically downward (downward in FIG. 1). The diameter of the enlarged diameter portion 22 increases as the distance from the curved tube portion 21 increases. The storage unit 23 stores the catalyst 26 therein. The diameter of the reduced diameter portion 24 decreases as the distance from the storage portion 23 increases. The straight pipe portion 25 has one end connected to the reduced diameter portion 24 and the other end connected to an exhaust system member (not shown). The enlarged diameter section 22, the storage section 23, and the reduced diameter section 24 are examples of an exhaust pipe that stores a catalyst.
シリンダヘッド１０は内燃機関の燃焼室を構成する一部材である。燃焼室の排気は、シリンダヘッド１０の内部を通じて触媒装置１１の排気管２０に排出される。排気は、湾曲管部２１、拡径部２２、格納部２３、縮径部２４、及び直管部２５の順に流れる。触媒装置１１は、触媒２６の触媒作用によって排気に含まれる大気汚染物質の浄化を行う。なお、図１に矢印Ｋで示した触媒装置１１を流れる排気の流れ方向を、触媒装置１１の軸方向とする。排気の流れ方向における上流側及び下流側を、触媒装置１１の軸方向においても上流側及び下流側と表現する。また、当該軸方向に直交する方向を、触媒装置１１の径方向とする。 The cylinder head 10 is one member constituting a combustion chamber of the internal combustion engine. The exhaust gas from the combustion chamber is discharged to the exhaust pipe 20 of the catalyst device 11 through the inside of the cylinder head 10. The exhaust gas flows in the order of the curved pipe section 21, the enlarged diameter section 22, the storage section 23, the reduced diameter section 24, and the straight pipe section 25. The catalyst device 11 purifies air pollutants contained in exhaust gas by the catalytic action of the catalyst 26. The flow direction of the exhaust gas flowing through the catalyst device 11 indicated by the arrow K in FIG. The upstream side and the downstream side in the exhaust gas flow direction are also expressed as the upstream side and the downstream side in the axial direction of the catalyst device 11. The direction perpendicular to the axial direction is defined as the radial direction of the catalyst device 11.
触媒装置１１は、排気管２０との間に隙間を有して設けられた遮熱板３１を備える。遮熱板３１は、例えばステンレス鋼からなり、排気管２０からの輻射熱を遮る。本例の遮熱板３１は、排気管２０の拡径部２２、格納部２３、及び縮径部２４の外周に、これらの外周面に沿うように設けられている。 The catalyst device 11 includes a heat shield plate 31 provided with a gap between the catalyst device 11 and the exhaust pipe 20. The heat shield plate 31 is made of, for example, stainless steel and blocks radiant heat from the exhaust pipe 20. The heat shield plate 31 of the present example is provided on the outer periphery of the enlarged diameter portion 22, the storage portion 23, and the reduced diameter portion 24 of the exhaust pipe 20 so as to follow these outer peripheral surfaces.
触媒装置１１は、排気管２０と遮熱板３１との間の隙間に空気層３２及び吸音材３３を備える。空気層３２は、排気管２０の触媒に接している部分と遮熱板３１との間の隙間に設けられている。すなわち、空気層３２は、格納部２３と遮熱板３１との間の隙間に設けられている。吸音材３３は、排気管２０の触媒に接していない部分と遮熱板３１との間の隙間を埋めるように設けられている。すなわち、吸音材３３は、拡径部２２と遮熱板３１との間の隙間、及び縮径部２４と遮熱板３１との間の隙間を埋めるように設けられている。吸音材３３は、空気よりも熱伝導率の低い素材からなり、排気管２０からの輻射熱を低減する。また、排気管２０の振動によって発生する放射音を低減する。 The catalyst device 11 includes an air space 32 and a sound absorbing material 33 in a gap between the exhaust pipe 20 and the heat shield plate 31. The air layer 32 is provided in a gap between the portion of the exhaust pipe 20 that is in contact with the catalyst and the heat shield plate 31. That is, the air layer 32 is provided in the gap between the storage section 23 and the heat shield plate 31. The sound absorbing material 33 is provided so as to fill a gap between a portion of the exhaust pipe 20 not in contact with the catalyst and the heat shield plate 31. That is, the sound absorbing material 33 is provided so as to fill the gap between the enlarged diameter portion 22 and the heat shield plate 31 and the gap between the reduced diameter portion 24 and the heat shield plate 31. The sound absorbing material 33 is made of a material having a lower thermal conductivity than air, and reduces radiant heat from the exhaust pipe 20. In addition, radiation noise generated by the vibration of the exhaust pipe 20 is reduced.
空気層３２は、軸方向の上流側及び下流側が吸音材３３によって塞がれている。したがって、空気層３２は、径方向内側が排気管２０に、軸方向の上流側及び下流側が吸音材３３に、径方向外側が遮熱板３１によって閉じられた空間になっている。 The air layer 32 is closed by the sound absorbing material 33 on the upstream side and the downstream side in the axial direction. Therefore, the air space 32 is a space closed by the exhaust pipe 20 on the radial inside, the sound absorbing material 33 on the upstream and downstream sides in the axial direction, and the heat shield plate 31 on the radial outside.
本実施形態の作用効果について説明する。
（１）触媒２６を格納している排気管２０との間に隙間を有して設けられた遮熱板３１を備えた。また、排気管２０と遮熱板３１との間の隙間に、空気層３２と吸音材３３とを備えた。この構成によれば、空気層３２が設けられた部分では、排気管２０の振動が吸音材３３を介して遮熱板３１に伝達されることがない。したがって、排気管２０の振動が遮熱板３１に伝達し難くなる。
The operation and effect of the present embodiment will be described.
(1) A heat shield plate 31 provided with a gap between the exhaust pipe 20 storing the catalyst 26 and the exhaust pipe 20 is provided. Further, an air space 32 and a sound absorbing material 33 are provided in a gap between the exhaust pipe 20 and the heat shield plate 31. According to this configuration, in the portion where the air layer 32 is provided, the vibration of the exhaust pipe 20 is not transmitted to the heat shield plate 31 via the sound absorbing material 33. Therefore, it is difficult for the vibration of the exhaust pipe 20 to be transmitted to the heat shield plate 31.
（２）排気管２０において触媒２６と接している部分は、触媒２６によって振動が減衰されるため、発生する振動が排気管２０の他の部分よりも小さい。本実施形態では、排気管２０において触媒２６と接している部分である格納部２３と遮熱板３１との間の隙間に空気層３２を配置した。したがって、排気管２０の触媒と接している部分と遮熱板３１との間の隙間に空気層３２を設けることに起因する放射音の増大は抑制される。 (2) Since the vibration of the portion of the exhaust pipe 20 that is in contact with the catalyst 26 is attenuated by the catalyst 26, the generated vibration is smaller than other portions of the exhaust pipe 20. In the present embodiment, the air layer 32 is disposed in the gap between the heat storage plate 31 and the storage section 23, which is the portion of the exhaust pipe 20 that is in contact with the catalyst 26. Therefore, an increase in radiated sound caused by providing the air layer 32 in the gap between the portion of the exhaust pipe 20 in contact with the catalyst and the heat shield plate 31 is suppressed.
（３）本実施形態では、空気層３２の軸方向の上流側及び下流側を塞ぐように吸音材３３が配置された。この構成によれば、空気層３２は、排気管２０と遮熱板３１との間の隙間において、閉じられた空間になっている。その結果、排気管２０の輻射熱が空気層３２から排気管２０及び遮熱板３１の間の隙間の上流端又は下流端を通って触媒装置１１の外部へ漏出し難くなる。これは、特にデッドソーク時に、触媒装置１１の外部の他の機器を輻射熱から保護するのに有利である。 (3) In the present embodiment, the sound absorbing material 33 is arranged so as to cover the upstream side and the downstream side of the air layer 32 in the axial direction. According to this configuration, the air space 32 is a closed space in the gap between the exhaust pipe 20 and the heat shield plate 31. As a result, it becomes difficult for the radiant heat of the exhaust pipe 20 to leak out of the catalyst device 11 from the air layer 32 through the upstream end or the downstream end of the gap between the exhaust pipe 20 and the heat shield plate 31. This is advantageous for protecting other devices outside the catalytic device 11 from radiant heat, particularly during dead soak.
なお、本実施形態は、以下のように変更して実施することができる。本実施形態及び以下の変更例は、技術的に矛盾しない範囲で互いに組み合わせて実施することができる。
・本実施形態において、空気層３２は、格納部２３と遮熱板３１との間の隙間の全領域に亘って設けられなくてもよい。例えば、吸音材３３が格納部２３と遮熱板３１との間の隙間に設けられている場合について、図２及び図３を用いて説明する。
The present embodiment can be modified and implemented as follows. The present embodiment and the following modified examples can be implemented in combination with each other within a technically consistent range.
In the present embodiment, the air layer 32 may not be provided over the entire area of the gap between the storage section 23 and the heat shield plate 31. For example, a case where the sound absorbing material 33 is provided in a gap between the storage unit 23 and the heat shield plate 31 will be described with reference to FIGS. 2 and 3.
図２に示すように、格納部２３と遮熱板３１との間の隙間に設けられた空気層３２のさらに径方向外側に、吸音材３３が設けられてもよい。この場合でも、排気管２０の振動が遮熱板３１に伝達し難くなる。 As shown in FIG. 2, a sound absorbing material 33 may be provided further radially outside the air layer 32 provided in the gap between the storage section 23 and the heat shield plate 31. Even in this case, it is difficult for the vibration of the exhaust pipe 20 to be transmitted to the heat shield plate 31.
図３に示すように、格納部２３と遮熱板３１との間の隙間において吸音材３３の内部に空気層３２が設けられていてもよい。すなわち、空気層３２は、吸音材３３によって囲まれた部屋になっている。なお、格納部２３と遮熱板３１との間の隙間において、格納部２３と遮熱板３１とが吸音材３３を介して接続されている部分があってもよい。すなわち、空気層３２は、格納部２３と遮熱板３１との間の隙間の一部に設けられていればよい。 As shown in FIG. 3, an air layer 32 may be provided inside the sound absorbing material 33 in a gap between the storage section 23 and the heat shield plate 31. That is, the air layer 32 is a room surrounded by the sound absorbing material 33. In the gap between the storage section 23 and the heat shield plate 31, there may be a portion where the storage section 23 and the heat shield plate 31 are connected via the sound absorbing material 33. That is, the air layer 32 may be provided in a part of the gap between the storage unit 23 and the heat shield plate 31.
・吸音材３３は、拡径部２２及び縮径部２４と遮熱板３１との間の隙間の全領域に亘って設けられていなくてもよい。すなわち、拡径部２２及び縮径部２４と遮熱板３１との間の隙間に空気層３２が設けられていてもよい。ただし、拡径部２２及び縮径部２４は、格納部２３に比べて発生する振動が大きい。そのため、放射音の増大を抑制する観点から、空気層３２は、格納部２３と遮熱板３１との間の隙間のみに設けられていることが好ましい。 The sound absorbing material 33 may not be provided over the entire area of the gap between the large diameter portion 22 and the small diameter portion 24 and the heat shield plate 31. That is, the air layer 32 may be provided in the gap between the large diameter part 22 and the small diameter part 24 and the heat shield plate 31. However, the larger diameter portion 22 and the smaller diameter portion 24 generate larger vibrations than the storage portion 23. Therefore, from the viewpoint of suppressing an increase in radiated sound, the air layer 32 is preferably provided only in the gap between the storage section 23 and the heat shield plate 31.
・本実施形態において、遮熱板３１は、排気管２０の湾曲管部２１及び直管部２５の周囲に取り付けられてもよいし、排気管２０に連結される排気系部材に取り付けられてもよい。また、取付け方法も適宜変更してもよい。 In the present embodiment, the heat shield plate 31 may be attached around the curved pipe portion 21 and the straight pipe portion 25 of the exhaust pipe 20, or may be attached to an exhaust system member connected to the exhaust pipe 20. Good. In addition, the mounting method may be appropriately changed.
１０…シリンダヘッド、１１…触媒装置、２０…排気管、２１…湾曲管部、２２…拡径部、２３…格納部、２４…縮径部、２５…直管部、２６…触媒、３１…遮熱板、３２…空気層、３３…吸音材。
DESCRIPTION OF SYMBOLS 10 ... Cylinder head, 11 ... Catalytic device, 20 ... Exhaust pipe, 21 ... Curved pipe part, 22 ... Large diameter part, 23 ... Storage part, 24 ... Reduced diameter part, 25 ... Straight pipe part, 26 ... Catalyst, 31 ... Heat shield plate, 32: air layer, 33: sound absorbing material.
Claims (1)
前記排気管との間に隙間を有して設けられた遮熱板と、
前記排気管の前記触媒に接している部分と前記遮熱板との間の隙間に設けられた空気層と、
前記排気管の前記触媒に接していない部分と前記遮熱板との間の隙間に設けられた吸音材と、
を備える触媒装置。
An exhaust pipe containing the catalyst;
A heat shield provided with a gap between the exhaust pipe,
An air layer provided in a gap between the portion of the exhaust pipe in contact with the catalyst and the heat shield plate,
A sound absorbing material provided in a gap between a portion of the exhaust pipe not in contact with the catalyst and the heat shield plate,
A catalyst device comprising:
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018167662A JP2020041441A (en) | 2018-09-07 | 2018-09-07 | Catalyst device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018167662A JP2020041441A (en) | 2018-09-07 | 2018-09-07 | Catalyst device |
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| JP2020041441A true JP2020041441A (en) | 2020-03-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022067778A (en) * | 2020-10-21 | 2022-05-09 | 株式会社タツノ | Gas filling system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6324323U (en) * | 1986-07-31 | 1988-02-17 |
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2018
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6324323U (en) * | 1986-07-31 | 1988-02-17 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2022067778A (en) * | 2020-10-21 | 2022-05-09 | 株式会社タツノ | Gas filling system |
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