JP3101054B2 - Sealing device for pipe connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing device for connecting pipes, such as an exhaust manifold, a turbocharger, and an exhaust pipe, which connect fluids to each other.

[0002]

2. Description of the Related Art Generally, in an automobile engine, exhaust gas discharged from the engine is discharged into the atmosphere through an exhaust pipe. However, in an exhaust system, an exhaust manifold, an exhaust pipe, and exhaust energy are disposed. A turbocharger with a turbine driven by a turbine, a catalytic converter for detoxifying harmful substances such as carbon monoxide and nitrogen oxides contained in exhaust gas, an afterburner for burning hydrocarbons, and exhaust gas A muffler for attenuating noise is provided. Further, a seal ring is provided at a pipe connecting portion that connects the pipes through which the fluid such as the exhaust manifold and the exhaust pipe flows, so that the pipe connecting portion is kept airtight.

Conventionally, as a seal ring applied to such a pipe connection portion, there is one disclosed in Japanese Utility Model Laid-Open Publication No. 2-9374. As shown in FIG. 9, the seal ring 36 is formed by rolling a ring-shaped metal thin plate into an annular shape having a circular cross section, and a gasket material containing a non-heat-resistant substance filled in the hollow ring 37. 38.

As shown in FIG. 7 and FIG.
The surface of the flange 34 is formed in a plane, the annular groove 35 is formed in the surface of the flange 33 of the other tube 31, and a part of the seal ring 36 is fitted into the annular groove 35 so as to protrude from the annular groove 35. The flanges 33 of the tubes 31 and 32
By aligning the pipes 34 with each other and tightening them with bolts and nuts, the two pipes 31 and 32 are connected to each other while airtightness is maintained. At this time, the seal ring is elastically compressed between the two flanges and is pushed into the annular groove, so that both flange surfaces are almost in close contact with each other. In this state, the airtightness of the two flanges is reduced by the annular groove formed in the flange. The seal ring is maintained by being strongly pressed against the flange surface by the spring action of the seal ring which is about to protrude.

However, the pipe connection connecting the outlet pipe of the exhaust manifold and the inlet pipe of the turbocharger has a high temperature (for example, 750 ° C. or higher) in use, and is used for the pipe connection at the high temperature portion. The seal ring will be exposed to high temperatures. Therefore, when the conventional seal ring is used, the gasket material filled inside the metal seal ring is decomposed or thermally decomposed by the organic component of the binder contained in the gasket material. , And the volume of the gasket material is reduced accordingly. If the seal ring filled with the gasket material as described above is connected to the flange surfaces of both pipes with bolts and nuts, the gasket material will be subjected to a thermal load as described above and the volume of the gasket material will decrease. Therefore, the elastic compressive force of the seal ring is reduced, and the sealing performance of the contact surface of the pipe connection is reduced.

[0006] In addition, for a pipe connection portion in which a seal ring filled with a gasket material is sandwiched between flange surfaces of both pipes and connected by bolts and nuts, the flange surface of the pipe connection portion repeatedly uses a high operating temperature and a normal temperature. When the heat load is applied, the flange surfaces are distorted, the flange surfaces are deformed, the seal ring cannot be brought into good contact, and the sealing performance of the pipe connection further decreases. .

[0007] Japanese Patent Publication No. 62-2188 discloses that
A seal member used to join an exhaust turbocharger flange is disclosed. The sealing member includes a filler,
A metal jacket having a hollow ring shape enclosing the filler and having seams at both ends along the circumferential direction of the ring, wherein the metal jackets are double or triple and the seams at both ends of each jacket are shifted from each other It is. By displacing the seams of the metal jacket from each other, the sealing member can substantially prevent the medium or air to be sealed from entering the gap of the metal jacket.
As a sealing member used in a part that receives a large heat load, it cannot be said that this is also perfect, and it does not completely solve the problem that the sealing material is deteriorated due to oxidation and the like, and the sealing performance is reduced. .

[0008]

As described above, as described above, Japanese Utility Model Laid-Open No. 2-9374 or Japanese Patent Publication No. Sho 62-218.
The conventional seal ring disclosed in Japanese Patent Publication No. 8 has a fundamental problem in that both of them use a material which may be deteriorated by receiving a high temperature and a large thermal load.

Therefore, it is conceivable to make a seal ring by using a heat-resistant material which is not affected by heat, for example, a material such as ceramics or a heat-resistant alloy, without using any gasket material which is easily affected by heat. Can be In this case, it is necessary to provide a seal ring made of a heat-resistant material to have a function of a spring so as to be able to cope with a thermal load. In order to make the seal ring have the function of a spring, it is conceivable to process the seal ring itself into, for example, a disc spring shape.
Precision machining of heat-resistant materials into special shapes involves considerable difficulty and increased manufacturing costs. On the other hand, it is easy to precisely process the seal ring into a flat plate shape and the manufacturing cost does not increase. However, the flat seal ring itself does not generate a spring action and cannot cope with a thermal load.
Therefore, when the seal ring is formed in a flat plate shape, a problem is how to give the flat plate seal ring a function as a spring.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and has a pipe connecting portion having a pair of pipes having opposing surfaces facing each other and having a seal ring disposed between the opposing surfaces of a pair of pipes tightened to each other. Sealing device for pipe joints that can be easily manufactured without requiring high processing accuracy, and that can maintain high sealing properties by spring action even under conditions of use at high temperatures and large heat loads. It is to provide a device.

[0011]

The present invention is configured as follows to achieve the above object. That is,
The present invention relates to a pipe connecting portion sealing device having a pair of pipes having opposing surfaces facing each other and being tightened together and a seal ring arranged between the opposing surfaces of the pipes facing each other. The ring comprises a flat heat-resistant spring ring, and a thin ring having a bent portion that abuts against a flat surface of the heat-resistant spring ring and has a radial edge bent so as to generate a step in the radial direction. The heat-resistant spring ring is deformed into a dish-like shape by the step of the thin plate-like ring in a state where the pair of the pipes is tightened, and relates to a sealing device for a pipe connection portion.

Further, in the sealing device for the pipe connection portion, the heat-resistant spring ring is made of ceramics.

[0013] Further, in the sealing device for the pipe connecting portion, an annular groove into which a part of the seal ring is fitted is formed on the facing surface of at least one of the pipe bodies.

Alternatively, in the sealing device for a pipe connection, the bent portion of one of the radial edges of the sheet-like ring holds the heat-resistant spring ring, and the other of the radial edges of the thin plate-shaped ring. The bent portion of the portion is bent to a side opposite to the heat-resistant spring ring side.

Alternatively, the thin plate-shaped ring may include a first thin plate-shaped ring having the bent portion whose outer diameter side of the radial edge is bent and the bent portion whose inner diameter side of the radial edge is bent. And the heat-resistant spring ring is disposed between the first thin-plate ring and the second thin-plate ring.

Alternatively, the thin plate-shaped ring may have a first L-shaped ring having the bent portion whose outer diameter side of the radial edge is bent into an L-shaped cross section and an inner diameter side of the radial edge having a cross section of L. The second L having the bent portion bent in a letter shape
The first L-shaped ring and the second L-shaped ring.
A mold ring is disposed on each of the radially opposite edges of the heat-resistant spring ring on opposite surfaces.

Alternatively, the present invention provides a method for sealing a pipe connecting portion having a pair of pipes having opposing surfaces opposing each other and being tightened together, and a seal ring disposed between the opposing surfaces of the pipes opposing each other. In the apparatus, the seal ring is a flat heat-resistant spring ring, a pair of grommets holding an outer radial edge and an inner radial edge of the heat-resistant spring ring, and a pair of grommets. A wire ring interposed between the heat-resistant spring ring and the heat-resistant spring ring. The wire rings are respectively formed on opposite surfaces of the heat-resistant spring ring at the outer radial edge and the inner radial edge. The sealing device for a pipe connection part, wherein the heat-resistant spring ring is deformed into a dish shape by the interposition of the wiring when the pair of the pipes is tightened. About.

Since the sealing device for a pipe connection according to the present invention is constructed as described above, the heat-resistant spring ring constituting the seal ring is made of a material having excellent heat resistance, such as ceramics or heat-resistant alloy steel. However, since the heat-resistant spring ring is formed in a flat plate shape, it can be easily manufactured without requiring high processing accuracy. Further, since the thin plate-shaped ring constituting the seal ring can be made of a metal material, it is formed by bending.

A flat heat-resistant spring ring is assembled integrally with the thin plate-shaped ring, and is fitted in an annular groove formed between the opposing surfaces, in particular, in the opposing surface so that a part of the thin ring protrudes from the annular groove. When the pair of pipes is tightened after the seal ring has been inserted into the annular groove, the step formed in the thin plate-shaped ring, in other words, the stepped portion protruding from the annular groove acts as a flat plate. The heat-resistant spring ring is deformed into a dish shape. In the dish-like state of the heat-resistant spring ring, the heat-resistant spring ring has a spring action, so that even if a large heat load is applied, the sealing surface is always in close contact, and high sealing performance can be maintained.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing a preferred embodiment of a pipe connection sealing device according to the present invention. FIG. 1 is a schematic view showing an example of an exhaust manifold incorporating a pipe connection sealing device according to the present invention, and FIG. 2 is a line AA of FIG.
It is the side view seen from the side.

As shown in FIGS. 1 and 2, the exhaust manifold 1 is mounted on a cylinder head of an in-line six-cylinder engine. The exhaust manifold 1 has mounting flanges 2A and 2B attached to a cylinder head. The exhaust manifold 1 includes a first exhaust manifold 1A and a second exhaust manifold 1B each having three mounting flanges 2A and 2B corresponding to three cylinders. The first exhaust manifold 1A and the second exhaust manifold 1B are connected by a flexible joint 4 made of bellows. Further, the first exhaust manifold 1A and the second exhaust manifold 1B have outlet pipes 3A and 3B, respectively, which are collecting pipes. Outlet pipe 3
A and 3B are connected to inlets 5A and 5B of a turbocharger provided downstream of the engine by tightening bolts and nuts, respectively. In such a configuration, the exhaust gas discharged from the engine is collected in the outlet pipes 3A and 3B through the branch ports formed in the center of the mounting flanges 2A and 2B via the exhaust ports of the respective cylinders, and then is collected by the turbocharger. It is sent to the turbocharger through the inlets 5A and 5B of the charger.

The sealing device for the pipe connection is incorporated in the collecting pipe of the exhaust manifold 1, that is, the pipe 7 of the outlet pipes 3A and 3B and the pipe 8 of the inlet pipes 5A and 5B of the turbocharger. Opposite surfaces 9 are formed at the ends of the outlet pipes 3A and 3B of the exhaust manifold 1 and the inlet pipe 5 of the turbocharger.
Opposite surfaces 11 are formed at the ends of A and 5B. Opposing surfaces 9 formed at the ends of the pipes 7 of the outlet pipes 3A and 3B of the exhaust manifold 1 are provided with inlet pipes 5A and 5A of the turbocharger.
The annular grooves 6 are formed to face the facing surface 11 of the tube 8 of B, respectively. These annular grooves 6 have seal rings 1
0 is incorporated.

FIG. 3 is a sectional view showing an embodiment of the pipe connecting portion sealing device according to the present invention. The seal ring 10 in the sealing device at the pipe connection portion includes a ceramic spring ring 12 as a heat-resistant spring ring and a pair of pipes 7 and 8.
And a thin plate-shaped ring 13 having a function of deforming the ceramic spring ring 12 into a dish when tightened. The ceramic spring ring 12 is made of ceramics having excellent heat resistance, and has flat or flat flat surfaces 12A and 12B in a normal state where no load is applied. 12A, 12B
Deforms into a dish shape forming a tapered surface and acts as a spring. The thickness of the ceramic spring ring 12 is, for example,
0.1 to 1.0 mm. In this embodiment, three ceramic spring rings 12 are used in a stacked manner, but a plurality of spring rings 12 may be used in a stacked manner in order to increase the force required as a spring. The thin plate-shaped ring 13 is manufactured by bending using an inexpensive metal material having good workability. For example, the material of the thin ring 13 is preferably aluminum, SUS, or ordinary steel.

The thin plate-shaped ring 13 is disposed so as to entirely contact one flat surface 12 B of the ceramic spring ring 12. The thin ring 13 has a flat plate portion 13A, a bent portion 13B holding a heat-resistant spring ring formed on the inner diameter side of the radial edge, and a bent portion 1 formed on the outer diameter side of the radial edge.
3C. The holding portion 13B holds the inner diameter portion of the ceramic spring ring 12. The bent portion 13 </ b> C is bent to the side opposite to the ceramic spring ring 12 side, and abuts on the flat end surface of the tube body 8, that is, the opposing surface 11.

The seal ring 10 is assembled integrally by holding and locking the bent portion 13B of the thin plate ring 13 with the ceramic spring ring 12. A part of the assembled seal ring 10 is fitted into the annular groove 6 of the pipe body 7, and the pipe body 7 and the pipe body 8 are tightened by fixing means such as bolts and nuts, thereby being assembled to the pipe connection portion. Before the two pipes 7 and 8 are tightened, the seal ring 10 fitted in the annular groove 6 is the thin ring 1
A bent portion 13C corresponding to the plate thickness of 3 protrudes from the annular groove 6 to form a step with respect to the facing surface 11 of the tube 8. When the two pipes 7 and 8 are tightened, the ceramic spring ring 12 is pressed by the bent portions 13B and 13C of the thin plate ring 13 and deforms into a dish shape, generating a spring force. With this spring force, the bent portion 13B of the thin plate ring 13 is pressed against the bottom surface of the annular groove 6, and the bent portion 13C is pressed against the facing surface 11 of the tube 8 to be in close contact with each other.
Even if the opposing surface 11 is distorted due to a thermal load or the like, good sealing performance can be maintained by the generated spring force.

FIG. 4 is a cross-sectional view showing another embodiment of the pipe connection sealing device according to the present invention. The thin ring is composed of a pair of thin rings 14 and 15 made of a metal material. The thin ring 14 has a flat plate portion 14A.
And a ceramic spring ring 12
And a bent portion 14B formed by bending to the side. The thin ring 15 includes a flat plate portion 15A and a bent portion 15B formed by bending an inner diameter side of a radial edge portion toward the ceramic spring ring 12 side. Ceramic spring ring 12
Has flat flat surfaces 12A and 12B, and has a bent portion 14B of a thin plate ring 14 and a bent portion 1 of a thin plate ring 15.
5B. Then, the seal ring 10 composed of the ceramic spring ring 12 and the thin plate-shaped rings 14 and 15 is fitted into the annular groove 6 formed in the tube 7.

In this embodiment, the ceramic spring ring 12 is connected to the bent portions 14B, 15B of the thin plate-shaped rings 14, 15.
And fitted into the annular groove 6, and the pipe 7 and the pipe 8 are fastened by fixing means such as bolts and nuts, so that they are assembled to the pipe connection portion. Before the two pipes 7 and 8 are tightened, the sealing ring 10 fitted in the annular groove 6 is not used.
Is projected from the annular groove 6 by the thickness of the thin ring 15 to form a step with respect to the facing surface 11 of the tube 8. Both pipes 7,
When the plate 8 is tightened, the ceramic spring ring 12 is pressed by the two bent portions 14B and 15B of the thin plate rings 14 and 15 and is deformed into a dish shape, thereby generating a spring force. The bent portion 14B of the thin plate-shaped ring 14 is pressed against the bottom surface of the annular groove 6 by the generated spring force, and the bent portion 15B is pressed against the facing surface 11 of the tubular body 8 to be in close contact with each other. Even if the opposing surface 11 is distorted, good sealing performance can be maintained by the generated spring force.

FIG. 5 is a sectional view showing still another embodiment of the sealing device for a pipe connection according to the present invention. In this embodiment, the seal ring 10 is a ceramic spring ring 1.
2, a grommet 16 disposed on an outer diameter side of a radial edge of the ceramic spring ring 12, a grommet 17 disposed on an inner diameter side of a radial edge of the ceramic spring ring 12, and a ceramic spring ring 12 and grommet 1
Wiring 1 interposed between the wirings 6 and 17
8 and 19. That is, the thin ring
It is composed of a pair of grommets 16 and 17. The grommets 16 and 17 hold both radial edges of the heat-resistant spring ring 12 with wirings 18 and 19 interposed therebetween. Each of the wirings 18 and 19 is arranged on the opposite side to the surfaces 12A and 12B of the heat-resistant spring ring 12, respectively. The grommets 16 and 17 have a U-shaped cross section by bending. The grommet 16 sandwiches the outer diameter side of the ceramic spring ring 12 and the wire ring 18, and the grommet 17 sandwiches the inner diameter side of the ceramic spring ring 12 and the wire ring 19. The wiring 18 is a ceramic spring ring 1
The wiring ring 19 is disposed on the lower flat surface 12B of the ceramic spring ring 12.

The seal ring 10 is sandwiched by placing a wire ring 18 on the outer diameter side of the radial edge of the ceramic spring ring 12, sandwiching the wire ring 18 with a grommet 16 and caulking. The wiring 19 is overlapped on the inner diameter side of the edge to form the grommet 17.
Assembled by pinching and swaging. The assembled seal ring 10 is fitted into the annular groove 6 and fastened to the pipe connection portion by tightening the pipes 7 and 8 with fixing means such as bolts and nuts. Both pipes 7,
In a state before the tightening of the seal 8, the seal ring 10 fitted in the annular groove 6 protrudes from the annular groove 6 by the thickness of the wiring ring 19 and forms a step with respect to the facing surface 11 of the tube 8. When both tubes 7, 8 are tightened, grommet 1
The ceramic spring ring 12 is pressed by the step difference of 6, 17 and becomes a tapered surface in the radial direction to be deformed into a dish shape, thereby generating a spring force. With this spring force, the grommet 16 is pressed against the bottom surface of the annular groove 6 and the grommet 17 is pressed against the opposing surface 11 so that they are in close contact with each other. The sealing performance can be maintained.

FIG. 6 is a sectional view showing another embodiment of the pipe connecting portion sealing device according to the present invention. The thin plate-shaped ring includes a pair of L-shaped rings 20 and 21 made of a metal material, and has an L-shaped cross section by bending. The heat-resistant spring ring is made of a ceramic spring ring 12, and both surfaces are formed on flat surfaces 12A and 12B. The L-shaped ring 20 is disposed on the outer diameter side of the radial edge of the ceramic spring ring 12.
Is disposed on the inner diameter side of the radial edge of the ceramic spring ring 12. As shown in FIG. 6, the L-shaped rings 20 and 21 are disposed on flat surfaces 12A and 12B opposite to the ceramic spring ring 12, respectively.

In this embodiment, the seal ring 10 is
It comprises the mold rings 20, 21 and the ceramic spring ring 12. The seal ring 10 is fitted into the annular groove 6 formed in the pipe body 7, and the pipe body 7 and the pipe body 8 are tightened by fixing means such as bolts and nuts, thereby being assembled to the pipe connection portion. In a state before the two tubes 7 and 8 are tightened, only the thickness of the L-shaped ring 21 projects from the annular groove 6 and a step is formed with respect to the facing surface 11 of the tube 8. When the two tubes 7 and 8 are tightened, the ceramic spring ring 12 is pressed by the L-shaped ring 20 and the L-shaped ring 21 and deforms into a dish shape having a tapered surface inclined in the radial direction, thereby generating a spring force. . Due to the generated spring force, the L-shaped ring 20 is provided on the bottom surface of the annular groove 6 and the L-shaped ring 21 is provided on the facing surface 11 of the tube 8.
, And are brought into close contact with each other. Even if the opposing surface 11 is distorted, good sealing performance can be maintained by the generated spring force.

In the above embodiment, the material of the heat-resistant spring ring is ceramic, but other materials such as heat-resistant alloy steel, tool steel (SKD, SKH), stainless steel (SUS630),
A heat-resistant metal material such as Inconel (trade name), high nickel steel, titanium, Herons alloy (HA214, trade name) may be used.

[0033]

According to the present invention, there is provided a pipe connection sealing device comprising:
With the above structure, heat-resistant materials such as ceramics and heat-resistant alloy materials have poor workability, but are simple because the heat-resistant spring ring is simply processed into a flat ring with a flat shape. It can be processed with high precision.
On the other hand, the thin plate-shaped ring for deforming the heat-resistant spring ring into a dish shape can be made of a metal material, and a low-cost material with excellent workability can be used, so it can be easily processed into a special shape. . Therefore, the sealing device for this pipe connection is
It can be easily processed at low cost.

Further, when a flat heat-resistant spring ring is fitted into an annular groove formed in the tube and the pair of tubes is tightened,
The flat heat-resistant spring ring is deformed into a dish shape by the action of the thin ring. The heat-resistant spring ring has a spring action when it is deformed into a dish shape, so that even if a large heat load causes the opposite end face to be distorted, the sealing surface can always maintain a close contact state, and the pipe connection has a high seal. Nature can be secured.

Further, the sealing device for the pipe connection is composed of only a heat-resistant spring ring and a thin plate ring, and does not use any material which is easily affected by heat. There is no problem such as a decrease in volume, deformation, alteration, cracking, etc. unlike the conventional case, and the sealing performance does not decrease.

Further, by disposing a thin metal ring made of a relatively soft material on the opposing surface, that is, the sealing surface, the sealing surface comes into direct contact with a high-hardness material such as ceramic or heat-resistant alloy steel. As compared with the case, good sealing performance is secured. Further, since the heat-resistant spring ring is held by the thin plate-shaped ring, the heat-resistant spring ring is not easily damaged during use, and the durability can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an example of an exhaust manifold incorporating a pipe connection sealing device according to the present invention.

FIG. 2 is a side view as seen from a line AA side in FIG. 1;

FIG. 3 is an enlarged sectional view of a portion of a region B in FIG. 1 showing an embodiment of the pipe connection sealing device according to the present invention;

FIG. 4 is an enlarged cross-sectional view of a region B of FIG. 1 showing another embodiment of the pipe connection sealing device according to the present invention.

FIG. 5 is an enlarged sectional view of a region B of FIG. 1 showing still another embodiment of the pipe connection sealing device according to the present invention.

FIG. 6 is an enlarged sectional view of a portion of a region B of FIG. 1 showing another embodiment of the pipe connection sealing device according to the present invention.

FIG. 7 is a cross-sectional view showing a conventional pipe connection sealing device.

FIG. 8 is a perspective view showing a flange in the sealing device for the pipe connection part of FIG. 7;

9 is a cross-sectional view showing a seal ring in the pipe connection part sealing device of FIG. 7;

[Explanation of symbols]

 Reference Signs List 6 Annular groove 7, 8 Tube 9, 11 Opposing surface 10 Seal ring 12 Ceramic spring ring (heat-resistant spring ring) 12A, 12B Flat surface 13, 14, 15 Thin plate ring 13C, 14B, 15B Bent portion 16, 17 Grommet (thin ring) 18, 19 Wiring 20, 21 L-shaped ring (thin ring)

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yoshinori Dobuda 248 Kano, Higashi-Osaka, Osaka Japan Gasket Co., Ltd. (72) Inventor Akihiro Imai 248 Kano, Higashi-Osaka City, Osaka Nippon Gasket Co., Ltd. (56) References JP-A-5-86854 (JP, A) JP-A-63-176876 (JP, A) JP-A-48-100553 (JP, A) JP-A-48-4857 (JP, A) 57-176653 (JP, U) 2-9774 (JP, U) JP-B 62-2188 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16J 15 / 12 F16L 23/16

Claims (7)

(57) [Claims] 1. A sealing device for a pipe connection having a pair of tubes having opposed surfaces facing each other and tightened together and a seal ring disposed between the opposed surfaces of the tubes facing each other. The seal ring has a flat heat-resistant spring ring and its radial edge is bent so as to abut on the flat surface of the heat-resistant spring ring and generate a step in the radial direction.
It consists of a lamellar ring that having a folded portion below was, and characterized in that the heat-resistant spring ring clamped state of the pair of the tube is deformed into a dish shape by the step of the thin plate ring Pipe connection sealing device. Wherein the tube connecting portion of the sealing device according to claim 1, wherein the heat-resistant spring ring is made of ceramic. 3. The opposed surface of at least one of the tubes.
It said annular groove is formed part of the seal ring is fitted to the
Tube connecting portion of the sealing device according to claim 1, characterized in that they are. 4. A embrace the bent portion is the heat-resistant spring ring on one of the radial edge of the thin plate ring, also the heat is the bent portion of the other of the radial edge tube connecting portion of the sealing device according to claim 1, characterized in that is bent opposite to the sex spring ring side. 5. The sheet-like ring is provided with a radial edge.
The inner diameter side of the bent portion radially outer side is bent to the first sheet-shaped ring having the radial edge is folded in the
Claim 1, wherein the consist and a second lamellar rings having a bent portion, the heat-resistant spring ring is disposed between the second thin plate ring and the first thin plate ring A sealing device for a pipe connection according to claim 1. 6. The thin plate-like ring is provided with a radial edge portion.
Having the bent portion whose outer diameter side is bent into an L-shaped cross section.
The first L-shaped ring and the inner diameter side of the radial edge are
A second L-shaped rib having the bent portion bent in an L shape
The first L-shaped ring and the second L-shaped ring.
At both radial edges of the heat-resistant spring ring.
The sealing device for a pipe connection according to claim 1, wherein the sealing device is arranged on opposite surfaces . 7. An image forming apparatus comprising: opposing surfaces opposing each other;
A pair of tubes to be tightened and the tubes facing each other
Of a pipe connection having a seal ring disposed between opposing surfaces
In the sealing device, the seal ring has a flat heat resistance
A spring ring and an outer radial edge of the heat-resistant spring ring
And a pair of grippers each holding the inner and outer radial edges.
A grommet, the grommet and the heat-resistant spring ring,
Consisting of wirings respectively interposed between
The wiring is the outer radius of the heat-resistant spring ring.
On the opposite surface between the radial edge and the radial inner radial edge.
Each of the pipes is placed in a tight condition,
The spring ring is made into a dish shape by the interposition of the wiring.
Tube connecting portion of the sealing device you characterized in that it is deformed.