JP2006132373A - Egr gas mixing device - Google Patents

Egr gas mixing device Download PDF

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JP2006132373A
JP2006132373A JP2004320348A JP2004320348A JP2006132373A JP 2006132373 A JP2006132373 A JP 2006132373A JP 2004320348 A JP2004320348 A JP 2004320348A JP 2004320348 A JP2004320348 A JP 2004320348A JP 2006132373 A JP2006132373 A JP 2006132373A
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egr gas
venturi
annular slit
air supply
air
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Takashi Ishimori
崇 石森
Masami Kobayashi
まさみ 小林
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Hino Motors Ltd
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Hino Motors Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Abstract

<P>PROBLEM TO BE SOLVED: To provide an EGR gas mixing device capable of mixing a great quantity of EGR gas into charge air. <P>SOLUTION: A venturi part 10 is formed on a charge air pipe 1 communicating to a charge air manifold 3, an annular chamber 11 is provided on an outer circumference of the venturi part 10 and an EGR pipe 12 is connected to the annular chamber 11, an annular slit 13 keeping communication between an inside of the annular chamber 11 and an inside of the charge air pipe 1 is formed in the venturi part 10. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、ＥＧＲガス混合装置に関するものである。   The present invention relates to an EGR gas mixing device.

ＥＧＲガス混合装置は、一般に図９に示される如く、給気パイプ１に取り入れた給気２（新気）を、給気マニホールド３を介してエンジンの各気筒４に供給する構成において、エンジンから排出される排ガスの一部を、図示しない排気パイプ側から途中にＥＧＲバルブ５を備えたＥＧＲパイプ６を介して、開口７からＥＧＲガス８として給気パイプ１側へ再循環する構成を有している。   As shown in FIG. 9, the EGR gas mixing apparatus generally supplies the air supply 2 (fresh air) taken into the air supply pipe 1 to each cylinder 4 of the engine via the air supply manifold 3. A part of the exhaust gas discharged is recirculated from the opening 7 to the supply pipe 1 side as an EGR gas 8 through an EGR pipe 6 provided with an EGR valve 5 on the way from an exhaust pipe side (not shown). ing.

この構成によれば、ＥＧＲガス８が混入された給気２が給気マニホールド３からエンジンの各気筒４へ送り込まれるため、排ガスの大部分を構成する不活性ガスのもつ熱容量によって燃焼温度が低下され、排ガス中におけるＮＯxは低減される。   According to this configuration, the supply air 2 mixed with the EGR gas 8 is sent from the supply manifold 3 to each cylinder 4 of the engine, so that the combustion temperature is lowered by the heat capacity of the inert gas that constitutes most of the exhaust gas. NOx in the exhaust gas is reduced.

しかしながら、図９に示すように、給気パイプ１の側面に接続した１本のＥＧＲパイプ６によってＥＧＲガス８を給気２に混合する構成では、給気２に対してＥＧＲガス８を均一に混合することは難しく、更に、大量のＥＧＲガス８を瞬時に給気２に混合する必要が生じた場合には、開口７の面積が狭いために、給気２に対してＥＧＲガス８の混入割合を急激に高めることはできなかった。   However, as shown in FIG. 9, in the configuration in which the EGR gas 8 is mixed with the supply air 2 by the single EGR pipe 6 connected to the side surface of the supply air pipe 1, the EGR gas 8 is uniformly distributed with respect to the supply air 2. It is difficult to mix, and further, when it is necessary to mix a large amount of EGR gas 8 into the supply air 2 instantaneously, the area of the opening 7 is small, so that the EGR gas 8 is mixed into the supply air 2. The rate could not be increased rapidly.

このような問題を解決するための装置を開示する先行技術情報としては、例えば特許文献１がある。特許文献１では、給気パイプにベンチュリ部を形成し、このベンチュリ部に、主要な給気ガスの流れ方向に対して横向きの方向で且つベンチュリ部の接線方向からＥＧＲガスを供給する複数のＥＧＲガス入口通路を接続した構成としている。
特開２００３−００３９１０号公報 As prior art information disclosing an apparatus for solving such a problem, there is, for example, Patent Document 1. In Patent Document 1, a venturi portion is formed in an air supply pipe, and a plurality of EGR gas is supplied to the venturi portion in a direction transverse to the flow direction of the main air supply gas and from a tangential direction of the venturi portion. The gas inlet passage is connected.
JP 2003-003910 A

例えば、ターボチャージャーエンジンや過給機関等の強制吸込みエンジンにおいては、給気にＥＧＲガスを混合するためには好ましくない圧力差が存在する。このため、特許文献１に示すように、給気パイプにベンチュリ部を設けて該ベンチュリ部にＥＧＲ入口を接続し、給気がベンチュリ部を流動する際に生じる負圧を利用してＥＧＲガスを引込んで混合することは有効である。   For example, in a forced suction engine such as a turbocharger engine or a supercharged engine, there is an undesired pressure difference for mixing EGR gas with the supply air. For this reason, as shown in Patent Document 1, a venturi section is provided in an air supply pipe, an EGR inlet is connected to the venturi section, and EGR gas is supplied by using a negative pressure generated when the supply air flows through the venturi section. It is effective to pull in and mix.

しかしながら、特許文献１に示されるように、ベンチュリ部に対してＥＧＲガス入口通路を接線方向に接続した構成では、ベンチュリ部の作用によってＥＧＲガスを給気パイプに吸引する吸引作用を充分に発揮させることができず、そのために、特許文献１に示すように複数のＥＧＲガス入口通路を設けたとしても、瞬時に大量のＥＧＲガスを給気ガスに混合する要求が生じた場合には対応することができず、従って、ＥＧＲガス混合によるＮＯx低減効果は制限されてしまうという問題がある。   However, as shown in Patent Document 1, in the configuration in which the EGR gas inlet passage is tangentially connected to the venturi part, the suction action of sucking the EGR gas into the supply pipe by the action of the venturi part is sufficiently exhibited. For this reason, even if a plurality of EGR gas inlet passages are provided as shown in Patent Document 1, a case where a request for instantly mixing a large amount of EGR gas with the supply gas occurs can be handled. Therefore, there is a problem that the NOx reduction effect by EGR gas mixing is limited.

又、特許文献１においては、ベンチュリ部によってＥＧＲガスを給気に効果的に混合するための、ベンチュリ部に対するＥＧＲガス入口通路の接続位置、接続部の開口形状等の具体的な構成については何ら開示されていない。   Further, in Patent Document 1, there is no specific configuration such as the connection position of the EGR gas inlet passage with respect to the venturi section and the opening shape of the connection section in order to effectively mix the EGR gas into the supply air by the venturi section. Not disclosed.

本発明は、斯かる実情に鑑みて成したもので、大量のＥＧＲガスを給気に混合できるようにしたＥＧＲガス混合装置を提供することを目的としている。   The present invention has been made in view of such a situation, and an object of the present invention is to provide an EGR gas mixing device that can mix a large amount of EGR gas with the supply air.

本発明は、給気マニホールドに連通する給気パイプにベンチュリ部を形成し、該ベンチュリ部の外周に環状チャンバを設けて該環状チャンバにＥＧＲパイプを接続し、前記ベンチュリ部に、前記環状チャンバ内部と前記給気パイプ内部とを連通する環状スリットを形成したことを特徴とするＥＧＲガス混合装置に係るものである。   In the present invention, a venturi portion is formed in an air supply pipe communicating with an air supply manifold, an annular chamber is provided on the outer periphery of the venturi portion, an EGR pipe is connected to the annular chamber, and the inside of the annular chamber is connected to the venturi portion. And an EGR gas mixing device characterized in that an annular slit that communicates with the inside of the air supply pipe is formed.

上記手段によれば、ＥＧＲパイプによって環状チャンバに導かれたＥＧＲガスは、ベンチュリ部に形成した環状スリットを通して全周から給気パイプの給気に混合することができるので、給気に対してＥＧＲガスを大量に混合することが可能になり、更に、ＥＧＲガスが全周から給気に混合されるので、給気に対するＥＧＲガスの混合性を高めることができる。   According to the above means, the EGR gas guided to the annular chamber by the EGR pipe can be mixed with the supply air of the supply pipe from the entire circumference through the annular slit formed in the venturi portion. It becomes possible to mix a large amount of gas, and furthermore, since the EGR gas is mixed into the supply air from the entire circumference, it is possible to improve the mixability of the EGR gas with respect to the supply air.

前記ＥＧＲガス混合装置において、前記環状スリットは、前記ベンチュリ部の最小内径部位置よりも給気マニホールド側に設けることが好ましく、この構成では、ベンチュリ部に生じる負圧によってＥＧＲガスを有効に吸引することができ、よって更に大量のＥＧＲガスを給気に混合することができるようになる。   In the EGR gas mixing apparatus, the annular slit is preferably provided on the supply manifold side with respect to the position of the minimum inner diameter portion of the venturi portion. In this configuration, the EGR gas is effectively sucked by the negative pressure generated in the venturi portion. Therefore, a larger amount of EGR gas can be mixed into the supply air.

又、前記ＥＧＲガス混合装置において、前記ベンチュリ部に形成する環状スリットの端面は、その延長線がベンチュリ部の軸中心線に対して給気マニホールド側で交差する傾斜面とすることが好ましく、この構成では、ベンチュリ部によって生じる負圧部が前記傾斜した環状スリット内部に入り込み易くなることによりＥＧＲガスの吸引作用が高まり、よって更に大量のＥＧＲガスを給気に混合することができるようになる。   In the EGR gas mixing device, the end surface of the annular slit formed in the venturi part is preferably an inclined surface whose extension line intersects the axial center line of the venturi part on the air supply manifold side. In the configuration, the negative pressure portion generated by the venturi portion easily enters the inclined annular slit, so that the suction action of the EGR gas is enhanced, so that a larger amount of EGR gas can be mixed with the supply air.

又、前記ＥＧＲガス混合装置において、前記ベンチュリ部は、給気パイプの曲り部に設けることが好ましく、この構成では、前記給気パイプの曲り部によって給気が乱れる部分に環状スリットによって全周からＥＧＲガスが供給されるため、給気に対するＥＧＲガスの混合性が高められる。   Further, in the EGR gas mixing device, the venturi section is preferably provided at a bent portion of the air supply pipe. In this configuration, an annular slit is provided from the entire circumference to a portion where supply air is disturbed by the bent portion of the air supply pipe. Since the EGR gas is supplied, the mixing property of the EGR gas with respect to the supply air is improved.

本発明のＥＧＲガス混合装置によれば、ベンチュリ部に形成した環状スリットによってＥＧＲガスを給気に対して全周から混合するようにしたので、大量のＥＧＲガスを給気に混合することが可能になり、更に、ＥＧＲガスが全周から給気に混入されるので、給気に対するＥＧＲガスの混合性が高まるという優れた効果を奏し得る。   According to the EGR gas mixing device of the present invention, since the EGR gas is mixed from the entire circumference with respect to the supply air by the annular slit formed in the venturi portion, it is possible to mix a large amount of EGR gas into the supply air. Furthermore, since the EGR gas is mixed into the supply air from the entire circumference, it is possible to achieve an excellent effect that the mixing property of the EGR gas with respect to the supply air is increased.

更に、環状スリットをベンチュリ部の最小内径部位置よりも給気マニホールド側に設けること、及び、環状スリットの端面に傾斜面を形成することにより、環状スリットによるＥＧＲガスの吸引作用が高められ、これによって更に大量のＥＧＲガスを給気に混合できる効果がある。   Furthermore, by providing the annular slit closer to the air supply manifold than the position of the minimum inner diameter of the venturi, and by forming an inclined surface on the end face of the annular slit, the suction action of EGR gas by the annular slit is enhanced. As a result, a larger amount of EGR gas can be mixed with the supply air.

以下、本発明の実施の形態を添付図面を参照して説明する。   Embodiments of the present invention will be described below with reference to the accompanying drawings.

図１〜図４は本発明を実施する形態の一例であり、図１はＥＧＲガス混合装置の側面図、図２は図１のＩＩ−ＩＩ方向断面図、図３は図２のＩＩＩ−ＩＩＩ方向断面図、図４は図１の部分切断説明図であり、図９と同一の構成部分には同一の符号を付している。   1 to 4 show an example of an embodiment of the present invention, FIG. 1 is a side view of an EGR gas mixing device, FIG. 2 is a sectional view taken along the line II-II in FIG. 1, and FIG. FIG. 4 is a sectional view of a direction, and FIG. 4 is a partial cutaway explanatory view of FIG. 1, and the same components as those in FIG.

図１に示す如く、給気マニホールド３に連通する給気パイプ１に、約９０゜方向に曲げた曲り部９を形成し、該曲り部９に、給気２の上流側の縮径部１０ａと下流側の拡径部１０ｂとが連続したベンチュリ部１０を形成する。従って、ベンチュリ部１０は、その軸中心線Ｓが給気パイプ１の曲り部９に沿って曲った形状を有している。   As shown in FIG. 1, a bent portion 9 bent in the direction of about 90 ° is formed in the air supply pipe 1 communicating with the air supply manifold 3, and a reduced diameter portion 10 a on the upstream side of the air supply 2 is formed in the bent portion 9. And the downstream enlarged diameter portion 10b form a continuous venturi portion 10. Therefore, the venturi portion 10 has a shape in which the axial center line S is bent along the bent portion 9 of the air supply pipe 1.

更に、前記ベンチュリ部１０の外周に、該ベンチュリ部１０を取り巻く環状チャンバ１１を設け、該環状チャンバ１１にＥＧＲパイプ１２を接続する。更に、前記ベンチュリ部１０に、前記環状チャンバ１１内部と給気パイプ１内部とを連通する環状スリット１３を形成する。図３中、１４は給気マニホールド用厚肉部であり、前記環状チャンバ１１及び環状スリット１３を備えたベンチュリ部１０は鋳造等にて一体に構成されている。   Furthermore, an annular chamber 11 surrounding the venturi 10 is provided on the outer periphery of the venturi 10, and an EGR pipe 12 is connected to the annular chamber 11. Further, an annular slit 13 is formed in the venturi portion 10 to communicate the inside of the annular chamber 11 and the inside of the air supply pipe 1. In FIG. 3, reference numeral 14 denotes a thick portion for the air supply manifold, and the venturi portion 10 having the annular chamber 11 and the annular slit 13 is integrally formed by casting or the like.

前記環状スリット１３は、図４に示す如く縮径部１０ａの下流側の端面１５と拡径部１０ｂの上流側の端面１６とによって構成されており、更に、前記環状スリット１３は、前記ベンチュリ部１０の内径が一番小さくなる最小内径部位置Ｘよりも給気マニホールド３側（拡径部１０ｂ側）に設けるようにしている。図４では、環状スリット１３を形成する上流側の端面１５が最小内径部位置Ｘと一致している。   As shown in FIG. 4, the annular slit 13 is composed of an end face 15 on the downstream side of the reduced diameter portion 10a and an end face 16 on the upstream side of the enlarged diameter portion 10b. Further, the annular slit 13 is composed of the venturi portion. 10 is provided on the supply manifold 3 side (expanded portion 10b side) with respect to the minimum inner diameter portion position X where the inner diameter is the smallest. In FIG. 4, the upstream end face 15 forming the annular slit 13 coincides with the minimum inner diameter portion position X.

更に、前記環状スリット１３を形成する前記端面１５，１６は、前記ベンチュリ部１０の軸中心線Ｓと直交する面に対して給気マニホールド３側（拡径部１０ｂ側）に夫々傾斜している。即ち、図４に示す如く、前記端面１５，１６は、その延長線がベンチュリ部１０の軸中心線Ｓに対して給気マニホールド３側（拡径部１０ｂ側）で交差するように平行に傾斜した傾斜面１５’，１６’を形成している。ベンチュリ部１０の軸中心線Ｓに対する傾斜面１５’，１６’の傾斜角度αは約３０〜６０゜とすることが好ましい。この傾斜面１５’，１６’はＣ面取りによって形成することができる。更にこの時、前記端面１５，１６は一方のみを傾斜面とし、他方は軸中心線Ｓと直交する面に平行とすることもできる。   Further, the end faces 15 and 16 forming the annular slit 13 are inclined to the air supply manifold 3 side (the enlarged diameter part 10b side) with respect to the plane perpendicular to the axial center line S of the venturi part 10, respectively. . That is, as shown in FIG. 4, the end surfaces 15 and 16 are inclined in parallel so that the extension line intersects the axial center line S of the venturi portion 10 on the air supply manifold 3 side (the enlarged diameter portion 10 b side). The inclined surfaces 15 'and 16' are formed. The inclination angle α of the inclined surfaces 15 ′ and 16 ′ with respect to the axial center line S of the venturi portion 10 is preferably about 30 to 60 °. The inclined surfaces 15 'and 16' can be formed by C-chamfering. Further, at this time, only one of the end surfaces 15 and 16 may be an inclined surface, and the other may be parallel to a surface orthogonal to the axial center line S.

次に、上記図示例の作動を説明する。   Next, the operation of the illustrated example will be described.

図１〜図４において、ＥＧＲパイプ１２により環状チャンバ１１に導かれたＥＧＲガス８は、ベンチュリ部１０に形成した環状スリット１３を通して全周から給気パイプ１内部に流入するようになるので、給気２に対して大量のＥＧＲガス８を混合できるようになる。更に、ＥＧＲガス８が全周から給気２に混合されることによって、給気２に対するＥＧＲガス８の混合性が高まる。   1 to 4, the EGR gas 8 guided to the annular chamber 11 by the EGR pipe 12 flows into the air supply pipe 1 from the entire circumference through the annular slit 13 formed in the venturi 10. A large amount of EGR gas 8 can be mixed with the gas 2. Furthermore, the EGR gas 8 is mixed with the supply air 2 from the entire periphery, so that the mixing property of the EGR gas 8 with respect to the supply air 2 is enhanced.

この時、前記ベンチュリ部１０を、給気パイプ１に設けた曲り部９に形成したので、前記給気パイプ１の曲り部９によって給気２が乱れる部分に環状スリット１３により全周からＥＧＲガス８が供給されるため、給気２に対するＥＧＲガス８の混合性は更に高められる。   At this time, since the venturi portion 10 is formed in the bent portion 9 provided in the air supply pipe 1, an EGR gas is formed from the entire circumference by the annular slit 13 in a portion where the air supply 2 is disturbed by the bent portion 9 of the air supply pipe 1. Since 8 is supplied, the mixing property of the EGR gas 8 with respect to the supply air 2 is further enhanced.

前記ベンチュリ部１０によれば、図５に示すように、給気２の流動によってベンチュリ部１０の最小内径部位置Ｘより給気マニホールド３側（拡径部１０ｂ側）に負圧部１７が生じる。従って、前記環状スリット１３を前記ベンチュリ部１０の最小内径部位置Ｘよりも拡径部１０ｂ側に設けることにより、前記ベンチュリ部１０の拡径部１０ｂ側に生じる負圧部１７によって環状チャンバ１１内のＥＧＲガス８が有効に吸引され、これによって更に大量のＥＧＲガス８を給気２に混合できるようになる。   According to the venturi section 10, as shown in FIG. 5, the negative pressure section 17 is generated on the supply manifold 3 side (expanded section 10 b side) from the minimum inner diameter position X of the venturi section 10 due to the flow of the supply air 2. . Therefore, by providing the annular slit 13 on the enlarged diameter portion 10b side of the minimum inner diameter portion position X of the venturi portion 10, the negative pressure portion 17 generated on the enlarged diameter portion 10b side of the venturi portion 10 causes the inside of the annular chamber 11. The EGR gas 8 is effectively sucked, so that a larger amount of the EGR gas 8 can be mixed into the supply air 2.

更に、前記ベンチュリ部１０に形成する環状スリット１３の端面１５，１６を、その端面１５，１６の延長線が、ベンチュリ部１０の軸中心線Ｓに対して給気マニホールド３側（拡径部１０ｂ側）で交差するように傾斜した傾斜面１５’，１６’としているので、図６に示す如く、ベンチュリ部１０の拡径部１０ｂ側に生じる負圧部１７が前記傾斜面１５’，１６’による環状スリット１３の内部に入り込み易くなることによりＥＧＲガス８の吸引作用が高まり、これによって更に大量のＥＧＲガス８を吸引して給気２に混合することができるようになる。   Further, the end surfaces 15 and 16 of the annular slit 13 formed in the venturi portion 10 are arranged such that the extension lines of the end surfaces 15 and 16 are on the side of the air supply manifold 3 with respect to the axial center line S of the venturi portion 10 (the enlarged diameter portion 10b). As shown in FIG. 6, the negative pressure portion 17 generated on the diameter-enlarged portion 10 b side of the venturi portion 10 is formed on the inclined surfaces 15 ′ and 16 ′. This makes it easier to enter the inside of the annular slit 13, thereby increasing the suction action of the EGR gas 8, whereby a larger amount of EGR gas 8 can be sucked and mixed with the supply air 2.

本発明者らは、本発明の作用を確認する為に以下の如き試験を実施した。   The present inventors conducted the following tests in order to confirm the action of the present invention.

図７（ａ）、（ｂ）、（ｃ）、（ｄ）に示す如く、給気２が流動する同一形状としたベンチュリ部１０に、環状チャンバ１１を備えると共に、同一のスリット幅（７ｍｍ）で異なる４つの形状の環状スリット１３を備えた装置を用意した。図７（ａ）はベンチュリ部１０の軸中心線Ｓに対して直角な端面１５，１６からなる環状スリット１３を、最小内径部位置Ｘを跨ぐように設けた場合であり、図７（ｂ）は図７（ａ）と同様の環状スリット１３を最小内径部位置Ｘより拡径部１０ｂ側に設けた場合であり、図７（ｃ）は環状スリット１３を最小内径部位置Ｘより拡径部１０ｂ側に設け、更に拡径部１０ｂ側の端面１６のみに傾斜面１６’を形成した場合であり、図７（ｄ）は環状スリット１３を最小内径部位置Ｘより拡径部１０ｂ側に設け、更に両側の端面１５，１６に傾斜面１５’，１６’を形成した場合（前記形態例と同様の構成）である。   As shown in FIGS. 7A, 7B, 7C, and 7D, the venturi 10 having the same shape in which the air supply 2 flows is provided with an annular chamber 11 and the same slit width (7 mm). A device having four different shapes of annular slits 13 was prepared. FIG. 7A shows a case where an annular slit 13 composed of end faces 15 and 16 perpendicular to the axial center line S of the venturi portion 10 is provided so as to straddle the minimum inner diameter portion position X. FIG. 7 is a case where the same annular slit 13 as in FIG. 7A is provided on the side of the enlarged diameter portion 10b from the minimum inner diameter portion position X, and FIG. This is a case where the inclined surface 16 ′ is formed only on the end surface 16 on the side of the enlarged diameter portion 10 b and provided on the side of the enlarged diameter portion 10 b, and FIG. Furthermore, this is a case where inclined surfaces 15 ′ and 16 ′ are formed on the end surfaces 15 and 16 on both sides (the same configuration as in the embodiment).

そして、上記各装置のベンチュリ部１０内に同一流量の給気２を供給し、且つ環状チャンバ１１に同一流量のＥＧＲガス８を供給して、前記各環状スリット１３を介してベンチュリ部１０内部の給気２にＥＧＲガス８を混合する際における給気２の入口圧力とＥＧＲガス８の入口圧力とを計測し、その圧力の差圧を解析した結果を図８に示した。   Then, the supply air 2 having the same flow rate is supplied into the venturi unit 10 of each of the above apparatuses, and the EGR gas 8 having the same flow rate is supplied to the annular chamber 11, and the inside of the venturi unit 10 is supplied through the annular slits 13. FIG. 8 shows the result of measuring the pressure difference between the inlet pressure of the supply air 2 and the inlet pressure of the EGR gas 8 when the EGR gas 8 is mixed with the supply air 2 and analyzing the pressure difference.

図８によれば、図７（ａ）に示したベンチュリ部１０の軸中心線Ｓに対して直角な環状スリット１３を、最小内径部位置Ｘを跨ぐように設けた場合に比して、図７（ｂ）の如く環状スリット１３を最小内径部位置Ｘより拡径部１０ｂ側に設けた場合には差圧が減少した。従って、前記環状スリット１３を最小内径部位置Ｘの拡径部１０ｂ側に設けることは差圧を小さくできるために有効であり、給気２に対してＥＧＲガス８が混入され易くなる効果がある。更に、図７（ｃ）の如く下流側の端面１６のみに傾斜面１６’を形成した場合には、図７（ｂ）の場合よりも更に差圧が小さくなっており、よって端面１５，１６の一方にのみ傾斜面１６’を形成しても有効であることが分かった。更に、図７（ｄ）の如く環状スリット１３の両方の端面１５，１６に傾斜面１５’，１６’を形成した場合には図７（ｃ）の場合よりも更に差圧が小さくなっており、その差圧はマイナスの値を示した。このように差圧がマイナスの値になることは、環状スリット１３によって更に大量のＥＧＲガス８を吸引して給気２に混合できる余裕があることを示している。   According to FIG. 8, as compared with the case where the annular slit 13 perpendicular to the axial center line S of the venturi portion 10 shown in FIG. When the annular slit 13 was provided on the side of the enlarged diameter portion 10b from the minimum inner diameter portion position X as shown in FIG. 7 (b), the differential pressure decreased. Therefore, providing the annular slit 13 on the side of the enlarged diameter portion 10b of the minimum inner diameter portion position X is effective because the differential pressure can be reduced, and the EGR gas 8 is easily mixed into the supply air 2. . Further, when the inclined surface 16 ′ is formed only on the downstream end surface 16 as shown in FIG. 7C, the differential pressure is further smaller than in the case of FIG. It has been found that it is effective to form the inclined surface 16 'only on one of the surfaces. Further, when the inclined surfaces 15 'and 16' are formed on both end surfaces 15 and 16 of the annular slit 13 as shown in FIG. 7 (d), the differential pressure is smaller than in the case of FIG. 7 (c). The differential pressure showed a negative value. Thus, the negative pressure difference indicates that there is a margin in which a larger amount of EGR gas 8 can be sucked and mixed with the supply air 2 by the annular slit 13.

従って、上記から明らかなように、ベンチュリ部１０に設けた環状スリット１３によれば開口面積を増加できることによってＥＧＲガス８の混入が容易になり、更に、環状スリット１３を前記ベンチュリ部１０の最小内径部位置Ｘよりも給気マニホールド３側に設けること、及び、前記環状スリット１３の端面１５，１６に、その端面１５，１６の延長線がベンチュリ部１０の軸中心線Ｓに対して給気マニホールド３側で交差する傾斜面１５’，１６’を形成することにより、環状スリット１３によるＥＧＲガス８の吸引作用が高められ、これによって、大量のＥＧＲガス８を給気２に混合できるようになる。   Therefore, as apparent from the above, according to the annular slit 13 provided in the venturi portion 10, the opening area can be increased, so that the EGR gas 8 can be easily mixed. Further, the annular slit 13 is made to have the minimum inner diameter of the venturi portion 10. The air supply manifold 3 is provided on the side of the air supply manifold 3 relative to the portion position X, and the end surfaces 15 and 16 of the annular slit 13 are extended from the end surfaces 15 and 16 with respect to the axial center line S of the venturi 10. By forming the inclined surfaces 15 ′ and 16 ′ intersecting on the three sides, the suction action of the EGR gas 8 by the annular slit 13 is enhanced, and thereby a large amount of EGR gas 8 can be mixed with the supply air 2. .

なお、本発明のＥＧＲガス混合装置は、上記形態にのみ限定されることなく本発明の要旨を逸脱しない範囲内において種々変更を加え得ることは勿論である。   Of course, the EGR gas mixing apparatus of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.

本発明を実施する形態の一例としてのＥＧＲガス混合装置の全体概要構成図である。BRIEF DESCRIPTION OF THE DRAWINGS It is a whole schematic block diagram of the EGR gas mixing apparatus as an example of embodiment which implements this invention. 図１のＩＩ−ＩＩ方向矢視図である。It is an II-II direction arrow line view of FIG. 図２のＩＩＩ−ＩＩＩ方向矢視図である。It is a III-III direction arrow directional view of FIG. 図１の部分切断説明図である。FIG. 2 is a partial cut explanatory view of FIG. 1. ベンチュリ部の作用を示す説明図である。It is explanatory drawing which shows the effect | action of a venturi part. 傾斜面を備えた環状スリットの作用を示す説明図である。It is explanatory drawing which shows the effect | action of the annular slit provided with the inclined surface. （ａ）、（ｂ）、（ｃ）、（ｄ）は本発明の作用を確認する試験を実施するための異なる形状の環状スリットを備えた装置の例を示す断面図である。(A), (b), (c), (d) is sectional drawing which shows the example of the apparatus provided with the annular slit of a different shape for implementing the test which confirms the effect | action of this invention. 図７の各環状スリットの場合における給気の入口圧力とＥＧＲガスの入口圧力、及びその差圧を解析した結果を示す線図である。It is a diagram which shows the result of having analyzed the inlet pressure of the supply air, the inlet pressure of EGR gas, and its differential pressure in the case of each annular slit of FIG. 従来のＥＧＲガス混合装置の一例を示す側面図である。It is a side view which shows an example of the conventional EGR gas mixing apparatus.

符号の説明Explanation of symbols

１ 給気パイプ
３ 給気マニホールド
９ 曲り部
１０ ベンチュリ部
１１ 環状チャンバ
１２ ＥＧＲパイプ
１３ 環状スリット
１５，１６ 端面
１５’，１６’ 傾斜面
Ｓ 軸中心線
Ｘ 最小内径部位置
α 傾斜角度 DESCRIPTION OF SYMBOLS 1 Air supply pipe 3 Air supply manifold 9 Bending part 10 Venturi part 11 Annular chamber 12 EGR pipe 13 Annular slit 15,16 End surface 15 ', 16' Inclined surface S Axis centerline X Minimum inner diameter part position α Inclination angle

Claims (4)

給気マニホールドに連通する給気パイプにベンチュリ部を形成し、該ベンチュリ部の外周に環状チャンバを設けて該環状チャンバにＥＧＲパイプを接続し、前記ベンチュリ部に、前記環状チャンバ内部と前記給気パイプ内部とを連通する環状スリットを形成したことを特徴とするＥＧＲガス混合装置。   A venturi portion is formed in an air supply pipe communicating with the air supply manifold, an annular chamber is provided on an outer periphery of the venturi portion, an EGR pipe is connected to the annular chamber, and the inside of the annular chamber and the air supply are connected to the venturi portion. An EGR gas mixing device characterized in that an annular slit communicating with the inside of a pipe is formed. 前記環状スリットは、前記ベンチュリ部の最小内径部位置よりも給気マニホールド側に設けたことを特徴とする請求項１記載のＥＧＲガス混合装置。   The EGR gas mixing apparatus according to claim 1, wherein the annular slit is provided closer to a supply manifold side than a position of a minimum inner diameter portion of the venturi portion. 前記ベンチュリ部に形成する環状スリットの端面は、その延長線がベンチュリ部の軸中心線に対して給気マニホールド側で交差する傾斜面を有することを特徴とする請求項１又は２記載のＥＧＲガス混合装置。   3. The EGR gas according to claim 1, wherein an end surface of the annular slit formed in the venturi portion has an inclined surface whose extension line intersects with the axial center line of the venturi portion on the supply manifold side. Mixing equipment. 前記ベンチュリ部は、給気パイプの曲り部に設けたことを特徴とする請求項１〜３のいずれか１つに記載のＥＧＲガス混合装置。   The EGR gas mixing apparatus according to any one of claims 1 to 3, wherein the venturi section is provided at a bent portion of an air supply pipe.
JP2004320348A 2004-11-04 2004-11-04 Egr gas mixing device Pending JP2006132373A (en)

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JP2010222976A (en) * 2009-03-19 2010-10-07 Mitsubishi Motors Corp Exhaust gas recirculation device
JP2010255581A (en) * 2009-04-28 2010-11-11 Hino Motors Ltd Egr gas mixing device
US8056340B2 (en) 2010-08-17 2011-11-15 Ford Global Technologies, Llc EGR mixer for high-boost engine systems
JP2013160189A (en) * 2012-02-08 2013-08-19 Hino Motors Ltd Egr gas mixing device
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US11293382B2 (en) 2020-01-08 2022-04-05 Woodward, Inc. Passive pumping for recirculating exhaust gas

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Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7568340B2 (en) * 2006-05-24 2009-08-04 Honeywell International, Inc. Exhaust gas recirculation mixer
WO2008136641A1 (en) * 2007-05-08 2008-11-13 Xyvec Inc. Air supercharger and air supercharging system for engine
JP2010059918A (en) * 2008-09-05 2010-03-18 Mitsubishi Heavy Ind Ltd Air supply device for engine with egr device
JP2010101191A (en) * 2008-10-21 2010-05-06 Hino Motors Ltd Egr gas mixing device
JP2010222975A (en) * 2009-03-19 2010-10-07 Mitsubishi Motors Corp Exhaust gas recirculation device
JP2010222976A (en) * 2009-03-19 2010-10-07 Mitsubishi Motors Corp Exhaust gas recirculation device
JP2010255581A (en) * 2009-04-28 2010-11-11 Hino Motors Ltd Egr gas mixing device
US8056340B2 (en) 2010-08-17 2011-11-15 Ford Global Technologies, Llc EGR mixer for high-boost engine systems
JP2013160189A (en) * 2012-02-08 2013-08-19 Hino Motors Ltd Egr gas mixing device
US10316803B2 (en) 2017-09-25 2019-06-11 Woodward, Inc. Passive pumping for recirculating exhaust gas
US10634099B2 (en) 2017-09-25 2020-04-28 Woodward, Inc. Passive pumping for recirculating exhaust gas
US10995705B2 (en) 2019-02-07 2021-05-04 Woodward, Inc. Modular exhaust gas recirculation system
US11293382B2 (en) 2020-01-08 2022-04-05 Woodward, Inc. Passive pumping for recirculating exhaust gas
US11174809B1 (en) 2020-12-15 2021-11-16 Woodward, Inc. Controlling an internal combustion engine system
US11215132B1 (en) 2020-12-15 2022-01-04 Woodward, Inc. Controlling an internal combustion engine system

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