JPS61140695A - Seal ring - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to pie! This invention relates to a seal ring used in a direct connection device. The pipe coupling device comprises a receiving half and a flange for each of the /4-b ends to be connected, the receiving halves being configured such that they can be tightened together, for example by screwing. Ori,
A seal is formed inside each of them, into which a seal surrounding the abutting ends of the inner and outer ends is inserted. The sealing ring is an elastomeric molded ring having an embedded inner ring, the ends of which deform to conform to the inner contour of each respective sealing chamber when the housing halves are clamped together. It is composed of

PRIOR ART Embodiments of this kind are described, for example, in German Patent Publication No. 3.
It is known from No. 206570.

Here, a flange, at least one clamping member and a housing half are loosely inserted onto each of the two /f-shaped ends, and these can be clamped together by screwing. A clamping chamber is formed between the flange and the housing half, into which a trap clamping member is inserted, and the radially inner clamping edge of the clamping member is placed over the 9-side end. The clamping surface of the clamping chamber overlies the radially outer clamping edge, and the clamping member has a force that presses it in the axial direction. protrudes in the axial direction from one tightening chamber so as to enlarge the outer diameter and reduce the inner diameter of this tightening member. Each of the two chamber halves is provided with a seal chamber that is open toward the butt part of the main tube for accommodating a seal ring, and a tightening chamber for accommodating a tightening member. It is provided within the flange and opens toward the butt portion of the arm. The rehousing halves can be tightened together by screwing.

This pipe connection device is particularly suitable for high pressures.

However, when high loads are applied, extrusion of the elastomeric molding ring occurs in the area of the annular outer edge, which rests on the outer circumferential surface of the two pipe ends. In such a case, if the sealing material gets into the permissible gap between the housing half and the pipe surface, then K. Furthermore, in this type of arm-to-arm coupling device, it can be difficult to align the arm and arm ends to be joined. Moreover, one seal ring is unsuitable for certain pipe surfaces.

PROBLEM TO BE SOLVED BY THE INVENTION The object of the invention is to improve the sealing properties and the ease of installation of the sealing ring described in the introduction.

This object is achieved according to the invention by providing an annular outer* radius of radius supported on the outer surface of each pipe end of the elastomer molded ring.

This prevents extrusion and collapse of the sealing material. In this case, when the inner diameter of the housing half takes the maximum value of the tolerance and the outer diameter of the main tube takes the minimum value of the tolerance, the rounded part is formed between the inner wall of the housing half and the pipe created by the assembly K. It is advantageous if the gap between the outer peripheries is also made larger.

In the case of a low-pressure flexible coupling device, it is sufficient simply to tighten the two flanges together by means of the clamping screw K, thereby forcing the reinsertion halves against the sealing member arranged between them. In an embodiment of this type, a clamping chamber can also be provided in the housing half, in which case the two runs can be designed as flat cover plates.

In this case, the tightening chamber is open toward the side opposite to the butt end. And also, if the two chamber halves are not specifically screwed together, so that when pressure pulsations occur, the pipe ends move at least partially together, even if the movement is minimal. Pulsations within the outer periphery of the seal member at the circular joint between the reincarnation halves will cause a slight crushing of the sealing material due to the gaps created by the tolerances of the reincarnation halves. There is a problem.

In order to eliminate this drawback, it is advantageous to form an annular groove opening outwards in the center of the outer circumferential surface of the elastomer molded ring.

An annular rim is provided on the inner ring surface of the sealing ring, which is placed between the two ends to facilitate the assembly of the sealing ring, thus
The combination of both and middle Eve becomes easier.

The inner ring therefore also ensures accurate positioning of this 79-ib coupling, since the annular rim of the inner ring serves as a stop for the abutting ends of both pipes.

When the diameter is large, it is desirable to construct the inner ring from a number of arcuate sections. In this case, the inner ring is provided with a cross-section that widens slightly radially outward in a wedge-like manner, and the inner ring is loosely inserted into the annular groove of the sealing ring, which has a shape approximately complementary to the cross-section described above. If you fit it in, it will be easier to install. (The inner ring, which is divided into several arcuate sections, can be produced inexpensively. When fitting the individual arcuate sections,
The annular groove of the elastomer molded ring that houses the inner ring has a slightly undercut cross-section to prevent it from falling out from the elastomeric molded ring, so that the arcuate portions are in this groove. It can be pushed into the body and fixed only by the elasticity of the elastomer molded body.

Furthermore, the annular rim of the inner ring aids in a smooth transition between the two ends to be joined together, thus minimizing flow losses.

The inner ring, which is composed of separate arcuate sections, is also useful when joining pipes with specially shaped pipe ends, for example, bulging or lightly curved around the circumference. It's advantageous. This also applies to pipes having a lining extending outward from the end of the main tube to a range extending over its entire circumference. In this case, an inner ring having an inner diameter approximately equal to the outer diameter of the /4' ides to be connected to each other cannot be fitted at all or is difficult to fit.

If there is a risk of damage to the pipe ends, an inner ring, preferably made of polytetrafluoroethylene, can also be used. When using an enameled pipe, for example, a single layer of enameled material may be provided on the end face of the nozzle, in which case the annular rim of the inner ring serves as a buffer between the two nozzle ends. This protection is important. This is because when the pipe connection device is tightened, an axial force may be generated that presses the two ends together as the clamping member used in the pipe connection device bends. It is.

Ru.

In a preferred embodiment of the invention, an annular fin located on each side of the annular rim of the inner ring projects below the elastomer molded ring, the thickness of this annular fin being preferably is approximately 0.5 mm. Therefore, since both of these thin fins cover the inner peripheral surface of the elastomer molded product ring, the elastomer molded product ring is
9 ide is protected from the medium flowing through it.

In all embodiments, the inner ring is always loosely arranged in the annular groove of the elastomer molded ring, so that the pressure of the medium increases the sealing effect of the sealing ring.

It is often the case that various pipe lines based on different standards have to be connected to different pipe lines based on old standards, which are already in principle obsolete. Pipes with different standards often have different outer diameters of the /f tubes. In accordance with the present invention, each such P4-ide end with a different outer diameter is provided such that the annular portion of the sealing ring rests on one pipe end and rests on the other 74-ide end. If the inner diameter of the parts is different from that of the two parts, they can be easily and reliably connected to each other using a quarter-wave coupling device of the construction described at the outset. In this case, in order to achieve a connection with as little turbulence as possible, it is necessary that the inner ring gradually fills in the difference in internal diameter of the pipe ends to be joined together (i.e., connects the inner surfaces of the pipe ends loosely). It is advantageous to have a conical inner contour.

Using a seal ring configured in this way, and therefore a seal ring in which not only the inner contour of the elastomer molded body ring but also the inner contour of the inner ring is standardized in stages,
For example, the 9-ide end based on I80 series 1 and the D
It is possible to connect the IN series and the nozzle end based on I'IF.

It is possible to dispense with the previously required reduced diameter joints which require welding or screwing.

The installation of the sealing ring according to the invention can be simplified for certain applications by making the inner ring and its annular rim separate. In this case, it is advantageous to fit the annular rim into an annular groove formed on the inner circumferential surface of the inner ring. First, without fitting the annular rim, simply slide the seal ring over the pipe and bring it to the position of the annular rim in the area of the butt between the two pipes to be joined. The annular rim is elastically deformed and pushed into the annular groove of the seal ring.

If pipes with a large nominal diameter are used, it is advantageous for the elastomer molded ring, the inner ring and/or the annular lip of the inner ring to be each formed from an endless elongate material. Such a seal ring, if the housing half and the flanges are configured as one member,
Also suitable for flange connections in container and equipment manufacturing.

In order to seal particularly high pressures, the two inner annular edges of the elastomeric molded ring, which rest on the outer surface of both pipe ends, form an angle β of less than 90° in cross section. It is advantageous if Irrespective of the cross-sectional shape of the inner annular groove of the elastomer molded sealing ring for receiving the inner ring, the configuration of the inner annular edge of the elastomer molded sealing ring has important implications for its sealing. That is, if the angle β defined above is at most 90' and is preferably made somewhat smaller, a self-sealing will occur in this part, especially at high pressures.

EXAMPLES Hereinafter, the present invention will be described based on examples with reference to the drawings.

In order to produce the pipe connection device according to FIG. 1, a flank 3° clamping member 4. Insert a common seal ring into the housing half 5 and both pipe ends 1° 21C. Each housing half 5 has an annular clamping chamber 7 open in the direction toward the flank 3, into which the clamping element 4 is inserted. This clamping member 4 is made of a truncated conical disc, and the radially inner clamping edge 4a of this disc is attached to the pipe end 1.
and 2, and these are configured such that the radially outer tightening edge 4bK is covered by the annular tightening surface 7a of the tightening chamber 7. In the unloaded state, the clamping element 4 protrudes from the end face of the corresponding receiving half 5. The structure of the tightening member 4 is such that the force that presses it in the axial direction against the back surface of the corresponding tightening chamber 7 expands the outer diameter of the tightening member 4 and simultaneously reduces the inner diameter. There is.

Seal chambers 9 are formed in each of the housing halves 5 and open toward the arm and rib abutting portions 8, and these seal chambers 9
is formed into a conical shape, and therefore tapers so that the diameter decreases as it goes toward the adjacent two-run no. 3. The structure of this conical seal chamber 9 has an effect on the sealing characteristics of the seal ring.

It has important meaning.

The pipe connecting butt portion 8 is surrounded by a seal ring, and this seal ring includes an elastomer molded ring 6 and an inner ring loosely fitted into an annular groove 6a formed inside the ring. Consisting of 10. The outer contour of the elastomeric molded body ring 6 roughly corresponds to the contour of the two sealing chambers 9 provided in the receiving halves 5, but in particular has an excess dimension so that the two receiving halves 5 are pressed together. axially and radially inward pressure is applied to the seal ring. .

Tightening is carried out via four bolts which are equally distributed around the outer circumference of the two runs and which penetrate through the flange 3 and housing half 5.

In FIG. 2, the use of a sealing ring and an inner ring 10 is shown for connecting a flange 3' and a nozzle provided on a stationary machine, this flange 3' 1 may be formed in a part of the sealing ring, and is fixed and forms one of two sealing chambers 9 for accommodating the corresponding axial end of the sealing ring. . In this example, the sealing chamber 9 provided in the two pipes 3' on the machine side simultaneously constitutes one pipe end 1.

- The 7-lanzo 3 on the jet side is formed as a sleeve joint, and the female thread 20 of this sleeve joint is screwed onto the male thread 2J of the 7-lanzo 3' on the machine side.

As is clear from FIG. 1 and particularly from FIG. It has become R1.

Furthermore, an annular groove r that is open toward the outside is formed in the center of the outer peripheral surface of the seal ring 6.

As shown in FIGS. 1, 2, and 4 to 7, an inner ring xolic inner annular rim 101 is formed 9, and this rim 10h serves as a stopper at both nodal ends 1.
It is located between 2.

According to FIG. 4, this inner ring 10 has a wedge-shaped cross section that slightly widens outward in the radial direction, and is loosely inserted into the annular groove 6a of the elastomer molded ring 6 adapted to this cross section. <It's embedded.

The slope of this wedge is represented by the angle α.

As shown in the Moo-A sectional view of FIG. 4, the inner ring 10 is composed of three circular arc portions 1o', xrl and 10#, each of which covers a circumferential angle of 120°.

Annular fins 10b provided on both sides of the annular rim 10b of the inner ring 10 shown in FIG. 5 extend over the lower surface of the seal ring 6. As shown in FIG.

The thickness d of the annular fin iob is approximately 0.5 mm.

In the case of the embodiment shown in FIG. 6, both fins 10b are formed slightly wide, and each transitions to an edge with a radius R3, and this part holds the elastomer molded ring 6 from both sides. ing. As a result, the radius R1 portion of the elastomer molded ring 6 is supported by the edge with the radius R3 of the fin 10b, so the elastomer molded product has low shear and hardness and is inexpensive and easy to install as a seal ring. A ring can be used.

In the embodiment shown schematically in FIG. 7, the pipe ends 1.2 to be connected to each other have different outside diameters dlsd! has. In this case, the ring portion surrounding the thinner pipe end 1 of the elastomer molded ring 6 and the inner ring 10 has a larger inner diameter than the ring portion surrounding the thicker pipe end 2. has. The inner surface of the annular rim 10a of the inner ring 10 is a conical inner surface 10eK which compensates for the difference in the inner diameter of the pipe ends 1.2 to be connected to each other.

In particular, as is clear from Fig. 3, both ends 1.2
(The annular inner edge 6C of the elastomer molded ring 6 supported on the outer peripheral surface of the ring 6 is 90° in cross section)
It forms a small angle β. This improves the sealing properties, especially at high pressures.

[Brief explanation of the drawing]

Figure 1 shows the pie being assembled! FIG. 2 is an axial sectional view of the coupling device in an assembled state and an axial sectional view of the main parts of the coupling device according to another embodiment. FIG. 3 is an axial sectional view of an embodiment of the seal ring according to the present invention. 4 is an axial and transverse sectional view of another embodiment of the seal ring, FIG. 5 is an axial sectional view of another embodiment of the inner ring, and FIG. 6 is an axial sectional view of another embodiment of the inner ring. FIG. 7 is an axial sectional view showing the mounting state of yet another embodiment of the seal ring. 1. 2...Archive end, 3, 3'...Flange,
4...Tightening member, 4m, 4b...Tightening edge, 5...
Housing half, 6... Elastomer molded body ring, fta
... annular groove, 6b ... outer edge, 6C ... inner edge,
DESCRIPTION OF SYMBOLS 1... Tightening chamber, 7a... Tightening surface, 8... Pipe butt part, 9... Seal chamber, 10... Inner ring,
10a... Annular rim, inb... Annular fin, 10c
...Inner surface, 10', 10'. 1/... arc part, 11... melt, 20... female thread, R15R1... round, dl*dl... outer diameter, r... annular groove, α, β... angle , 21...male thread. Applicant's representative Patent attorney Takehiko Suzue i-a Procedural amendment (side □, 6Q, 9/18, 1 Director General of the Patent Office Michibu Uga 1, Case display seal ring 3, Person making the amendment case) Relationship with Patent Applicant: Hens.) Otsuru e Maier 4, Agent: August 27, 1985

Claims (1)

[Claims] 1. Two housing halves (5) each having one seal chamber (9) formed in opposing sides; and the housing halves (5).
It consists of two flanges (3, 3') located on the side opposite to the sealing chamber (5), an inner ring (10), and an elastomer molded ring (6) with this inside. A sealing ring surrounding the end (8) and tightening the housing half (5) and the flanges (3, 3') to insert the sealing ring (6) received in the housing half (5) into the sealing chamber ( 9) in a sealing ring used in a pipe connecting device for connecting two pipe ends (1, 2), comprising tightening means (11; 20, 21) deformed to match the contour of the , the annular edges (6b) of the elastomer molded body ring (6) on both outer circumferential ends surrounding the outer circumferential surfaces of the two pipe ends (1, 2) are rounded (R_1).
A seal ring characterized by having. 2. The radius (R_1) is the inner diameter of the housing half (5) caused by the maximum tolerance of the inner diameter of the housing half (5) and the minimum tolerance of the pipe ends (1, 2). Claim 1, characterized in that the gap is set to be larger than the gap created between the circumferential surface and the outer circumference of the pipe ends (1, 2).
Seal ring as described in section. 3. The seal ring according to claim 1 or 2, wherein the elastomer molded ring (6) has an annular groove (r) that opens outward in the center of its outer periphery. 4. The inner ring 10 is connected to the two pipe ends (1
, 2) an annular rim (1
The seal ring according to any one of claims 1 to 3, characterized in that the seal ring has a seal ring 0a) on its inner circumferential surface. 5. The inner ring (10) has a slightly wedge-shaped cross section that widens radially outward, and there is a ring within the elastomer molded ring (6) that is approximately complementary to the cross section of the inner ring (10). 5. A sealing ring according to claim 1, wherein the sealing ring is loosely fitted into a formed annular groove (6a). 6. The inner ring (10) has a plurality of circular arc parts (10'
, 10'', 10''') according to any one of claims 1 to 5. 7. Any one of claims 1 to 6, wherein the inner ring (10) is made of metal.
Seal ring described in. 8. The inner ring (10) is the annular rim (10a)
The elastomer molded ring (6) is provided on both sides of the elastomer molded body ring (6).
Claims 1 to 7 have an annular fin (10b) projecting below the
Seal ring described in. 9. The seal ring according to claim 8, wherein the annular fin (10b) has a thickness of about 0.5 mm. 10. The seal ring according to claim 8 or 9, characterized in that the inner ring (10) is made of polytetrafluoroethylene. 11. The annular fin (10b) has a radius (R_2) that receives both ends of the inner circumference of the elastomer molded ring (6).
The seal ring according to any one of claims 8 to 10, characterized in that the seal ring has: 12. Outer diameter of the two pipe ends (d_1, d_2)
are different, the elastomer molded ring (6) has inner circumferential surfaces at both ends surrounding the two pipe ends (1, 2) that have different inner diameters corresponding to the outer diameters (d_1, d_2). Claim 1 characterized in that it has
The seal ring according to any one of items 1 to 11. 13. When the inner diameters of the two pipe ends (1, 2) are different, the inner ring (10) is different from the inner diameter of the pipe ends (1, 2).
2) The inner surface (10c) has a contour that gently connects the inner periphery of
) The seal ring according to any one of claims 1 to 12, characterized in that the seal ring has: 14, the inner ring (10) and the annular rim (10);
The seal ring according to any one of claims 4 to 13, characterized in that a) is constructed as a separate body. 15, said annular rim (10a) is connected to said inner ring (10
15. The seal ring according to claim 14, wherein the seal ring is inserted into an annular groove formed in the inner peripheral surface of the seal ring. 16. The seal ring according to any one of claims 1 to 15, characterized in that the elastomer molded ring (6) is a member formed from an endless and elongated material. 17. Seal ring according to any one of claims 1 to 16, characterized in that the inner ring (10) is a member formed from an endless elongated material. 18. The annular projection (10a) is an endless elongated material (6
18. The seal ring according to any one of claims 14 to 17, characterized in that the seal ring is a member formed from: 19. Said 2 of said elastomer molded body ring (6)
Claim 1, characterized in that the two annular inner edges (6c) surrounding the outer circumferences of the two pipe ends (1, 2) form an angle (β) of 90° or less in their axial cross section. 19. The seal ring according to any one of items 18 to 18.