JP2010127300A

JP2010127300A - Seal structure of flange connection surface

Info

Publication number: JP2010127300A
Application number: JP2008299566A
Authority: JP
Inventors: Masanori Nishimura; 昌典西村
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2008-11-25
Filing date: 2008-11-25
Publication date: 2010-06-10

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seal structure of a flange connection surface preventing leakage of inner fluid to the outside. <P>SOLUTION: An annular recession 1b is provided on one flange connection surface 1a of flange connection surfaces 1a and 2a connecting and sealing by metal-touching, and an annular protrusion 2b intruding into the annular recession 1b is provided on the other flange connection surface 2a, and thereby, the recession 1b and the protrusion 2b bendingly deform while abutting on the mating protrusion 2b and recession 1b even when a flange connecting part is deformed and opening from an inner peripheral side to an outer peripheral side occurs as if driving in a wedge, and two annular linear contact portions wherein the recession 1b and the protrusion 2b abut are generated in a position corresponding to the inner peripheral side and the outer peripheral side of the protrusion 2b between the recession 1b and the protrusion 2b, and leakage of the inner fluid to the outside is prevented by the two linear contact portions C1 and C2. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、フランジ接合面のシール構造に関する。 The present invention relates to a seal structure for a flange joint surface.

内部流体の外部への漏出を防止するフランジ接合面のシール構造としては、種々のものが知られているが、内部流体を高温、高圧のガスとした場合には、Ｏリング等のガスケットを使用できないため、フランジ同士をボルトにより締め付けフランジ接合面同士をメタルタッチにて接合しシールするのが一般的である。 Various seal structures are known for flange joint surfaces that prevent leakage of internal fluid to the outside. When the internal fluid is high-temperature, high-pressure gas, a gasket such as an O-ring is used. Therefore, it is general that the flanges are tightened with bolts and the flange joint surfaces are joined with a metal touch and sealed.

以下の特許文献１には、このメタルタッチのシール効果をより高めた構造が記載されている。具体的には、フランジ接合面同士の少なくとも一方のフランジ接合面に、同心上に径の異なる複数条の環状溝を設けることで、一方のフランジ接合面において半径方向に沿って連続する凹凸を形成し、これにより、ラビリンス効果と、溝を設けたことによるフランジ接合面の面積減少に基づくフランジ接合面相互の高い面圧が相俟って、ガスの外部への漏洩を防止できるとされている。
特開平１１−２１０４号公報 Patent Document 1 below describes a structure in which the sealing effect of the metal touch is further enhanced. Specifically, at least one flange joint surface of the flange joint surfaces is provided with a plurality of annular grooves having different diameters concentrically, thereby forming continuous concavities and convexities along the radial direction on one flange joint surface. Thus, it is said that the labyrinth effect and the high surface pressure between the flange joint surfaces based on the reduction in the area of the flange joint surface due to the provision of the grooves can prevent leakage of gas to the outside. .
Japanese Patent Laid-Open No. 11-2104

しかしながら、高温、高圧のガスを内部に通すフランジ接合部にあっては、圧力が掛かってフランジ接合部が変形し内周側から外周側に向かって楔が打ち込まれたかのように開いてしまう口開きが生じ（図２参照）、上記特許文献１の構成では、生じた隙間をガスが通り十分にガスの漏洩を防止できない。 However, in flange joints that allow high-temperature and high-pressure gas to pass through, the mouth opens as if the pressure is applied and the flange joint deforms and the wedge is driven from the inner periphery toward the outer periphery. (See FIG. 2), the configuration of the above-mentioned Patent Document 1 cannot sufficiently prevent gas leakage through the generated gap.

本発明は、このような課題を解決するために成されたものであり、ガスを始めとした内部流体の外部への漏洩を防止できるフランジ接合面のシール構造を提供することを目的とする。 The present invention has been made to solve such problems, and an object of the present invention is to provide a flange joint surface sealing structure that can prevent leakage of internal fluid such as gas to the outside.

本発明によるフランジ接合面のシール構造は、内部流体の外部への漏出を防止すべくフランジ接合面同士をメタルタッチにて接合しシールするフランジ接合面のシール構造において、フランジ接合面の一方に環状の凹部を設けると共に、フランジ接合面の他方に環状の凹部に進入する環状の凸部を設けたことを特徴としている。 The flange joint surface sealing structure according to the present invention is a flange joint surface seal structure in which the flange joint surfaces are joined and sealed with a metal touch to prevent leakage of internal fluid to the outside. And an annular convex portion that enters the annular concave portion on the other side of the flange joint surface.

このようなフランジ接合面のシール構造によれば、メタルタッチにて接合しシールするフランジ接合面同士のその一方のフランジ接合面に設けられた環状の凹部に、他方のフランジ接合面に設けられた環状の凸部が進入する構成のため、フランジ接合部が変形し内周側から外周側に向かって楔が打ち込まれたかのように開いてしまう口開きが生じても、凹部、凸部は、相手側の凸部、凹部に当接しながら撓むように変形し、凹凸部同士の間で凸部の内周側と外周側に対応する位置に、凹部と凸部が接触する環状の線接触箇所が二箇所生じ、この二箇所の線接触箇所により、内部流体の外部への漏洩が防止されるようになる。 According to such a flange joint surface sealing structure, the flange joint surfaces provided on the other flange joint surface are provided in the annular recess provided on one flange joint surface of the flange joint surfaces to be joined and sealed by metal touch. Due to the structure in which the annular convex part enters, even if the flange joint part is deformed and a mouth opening occurs as if the wedge is driven from the inner peripheral side toward the outer peripheral side, the concave part and the convex part are The ring-shaped line contact point where the concave part and the convex part come into contact with each other is located at the position corresponding to the inner peripheral side and the outer peripheral side of the convex part between the concave and convex parts. This occurs at two places, and the leakage of the internal fluid to the outside is prevented by these two line contact places.

このように本発明によれば、内部流体の外部への漏洩を防止できるフランジ接合面のシール構造を提供することが可能となる。 Thus, according to the present invention, it is possible to provide a flange joint surface sealing structure capable of preventing leakage of internal fluid to the outside.

以下、本発明に係るフランジ接合面のシール構造の好適な実施形態について図面を参照しながら説明する。図１は、本発明の実施形態に係るフランジ接合面のシール構造を示す断面図、図２は、図１に示す状態からフランジ接合部が変形し口開きが生じた状態を示す断面図であり、図１に示すように、本実施形態のフランジ接合面のシール構造１００は、高温、高圧のガスが内部を流れる筒状体Ｙ１，Ｙ２に適用されるものであり、具体的には、筒状体Ｙ１，Ｙ２同士を連結する筒状体端部のフランジ１，２に適用されるものである。 DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a preferred embodiment of a flange joint surface sealing structure according to the invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view showing a sealing structure of a flange joint surface according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a state where a flange joint portion is deformed from the state shown in FIG. As shown in FIG. 1, the flange joint surface sealing structure 100 according to this embodiment is applied to cylindrical bodies Y1 and Y2 through which high-temperature and high-pressure gas flows. This is applied to the flanges 1 and 2 at the ends of the cylindrical body that connect the cylindrical bodies Y1 and Y2.

フランジ１，２は環状に構成されて、その各々が周方向に沿って多数のボルト挿通用の貫通孔５を備え、フランジ１，２が合わされて貫通孔５にボルト３が挿入されナット４がボルト３に螺合しながら締め付けられることで、フランジ接合面１ａ，２ａ同士がメタルタッチにてシールされる構造とされている。 The flanges 1 and 2 are formed in an annular shape, each of which includes a plurality of through holes 5 for inserting bolts along the circumferential direction. The flanges 1 and 2 are combined, and the bolt 3 is inserted into the through hole 5 so that the nut 4 The flange joint surfaces 1a and 2a are sealed by metal touch by being tightened while being screwed to the bolt 3.

ここで、特に本実施形態にあっては、一方のフランジ接合面１ａで貫通孔５より内側位置に、環状の凹部１ｂが設けられると共に、他方のフランジ接合面２ａに、環状の凹部１ｂに進入する環状の凸部２ｂが設けられている。 Here, particularly in the present embodiment, an annular recess 1b is provided on the inner side of the through hole 5 on one flange joint surface 1a, and enters the annular recess 1b on the other flange joint surface 2a. An annular convex portion 2b is provided.

これらの凹部１ｂ、凸部２ｂは、互いに対向面同士の間（図では凸部２ｂの上面、下面及び右側面に対応する位置）に隙間を有する構成とされている。また、凹部１ｂ、凸部２ｂは、細長く形成され、所定の力が作用し、凹部１ｂ、凸部２ｂが相手側の凸部２ｂ、凹部１ｂに当接すると、撓むように変形する構成とされている。 The concave portion 1b and the convex portion 2b are configured to have a gap between opposing surfaces (positions corresponding to the upper surface, the lower surface, and the right side surface of the convex portion 2b in the drawing). Further, the concave portion 1b and the convex portion 2b are formed in an elongated shape, and when a predetermined force is applied, and the concave portion 1b and the convex portion 2b come into contact with the opposite convex portion 2b and the concave portion 1b, they are configured to bend and deform. Yes.

このような構成のフランジ接合面のシール構造１００によれば、筒状体Ｙ１，Ｙ２内を流れる高温、高圧のガスによって、図２に示すように、軸線方向の引張力Ｘが作用すると、フランジ接合部が変形し内周側から外周側に向かって楔が打ち込まれたかのように開く口開きが生じるが、このとき、凹部１ｂ、凸部２ｂは、相手側の凸部２ｂ、凹部１ｂに当接しながら撓むように変形し、凹凸部１ｂ，２ｂ同士の間で凸部２ｂの内周側と外周側に対応する位置に、凹部１ｂと凸部２ｂが接触する環状の線接触箇所が二箇所生じ、この二箇所の線接触箇所Ｃ１，Ｃ２により、ガスの外部への漏洩を防止できる。また、口開きが大きくなる程、接触力が大きくなるため、口開きが大きくなってしまってもガスの外部への漏洩を一層防止できる。 According to the flange joint surface sealing structure 100 having such a configuration, when an axial tensile force X is applied by the high-temperature, high-pressure gas flowing through the cylindrical bodies Y1, Y2, as shown in FIG. The joint part is deformed and a mouth opening is generated as if a wedge is driven from the inner peripheral side toward the outer peripheral side. At this time, the concave part 1b and the convex part 2b are in contact with the opposing convex part 2b and concave part 1b. It deforms so as to be bent while contacting, and two annular line contact points where the concave portion 1b and the convex portion 2b come into contact with each other are formed between the concave and convex portions 1b and 2b at positions corresponding to the inner peripheral side and outer peripheral side of the convex portion 2b The two line contact points C1 and C2 can prevent leakage of gas to the outside. Further, since the contact force increases as the opening becomes larger, the leakage of gas to the outside can be further prevented even if the opening becomes larger.

また、ボルト間の面圧を増やさなくても凹凸部１ｂ，２ｂでシールできるため、ボルト３及びナット４を減少でき、重量を軽減できる。また、フランジ厚を減らしても、フランジ１，２の変形によりシールできるため、フランジ厚を薄くでき、重量を一層軽減できる。また、従来漏れていたガスを有効に使用できるため、性能を向上できる。 Moreover, since it can seal with the uneven | corrugated | grooved parts 1b and 2b, without increasing the surface pressure between bolts, the volt | bolt 3 and the nut 4 can be reduced and weight can be reduced. Even if the flange thickness is reduced, the flange can be sealed by deformation of the flanges 1 and 2, so that the flange thickness can be reduced and the weight can be further reduced. Moreover, since the gas that has been leaked can be used effectively, the performance can be improved.

以上、本発明をその実施形態に基づき具体的に説明したが、本発明は上記実施形態に限定されるものではなく、例えば、上記実施形態においては、特に好ましいとして、内部流体をガスとしているが、内部流体を液体とした場合にも適用可能である。 Although the present invention has been specifically described above based on the embodiment, the present invention is not limited to the above embodiment. For example, in the above embodiment, the internal fluid is a gas as being particularly preferable. It is also applicable when the internal fluid is a liquid.

本発明の実施形態に係るフランジ接合面のシール構造を示す断面図である。It is sectional drawing which shows the seal structure of the flange joint surface which concerns on embodiment of this invention. 図１に示す状態からフランジ接合部が変形し口開きが生じた状態を示す断面図である。It is sectional drawing which shows the state which the flange junction part deform | transformed from the state shown in FIG. 1, and the opening of a mouth produced.

Explanation of symbols

１，２…フランジ、１ａ，２ａ…フランジ接合面、１ｂ…凹部、２ｂ…凸部、１００…フランジ接合面のシール構造、Ｃ１，Ｃ１…線接触箇所。 DESCRIPTION OF SYMBOLS 1, 2 ... Flange, 1a, 2a ... Flange joint surface, 1b ... Concave part, 2b ... Convex part, 100 ... Seal structure of flange joint surface, C1, C1 ... Line contact location.

Claims

In the flange joint surface seal structure that joins and seals the flange joint surfaces with metal touch to prevent leakage of internal fluid to the outside,
A flange joint surface sealing structure characterized in that an annular concave portion is provided on one of the flange joint surfaces, and an annular convex portion that enters the annular recess is provided on the other of the flange joint surfaces.