DE2116137A1 - Sewage pipe connector - with plastics sleeve and seal ring - Google Patents

Abstract

Large sewage pipe connector for the smooth pipe ends has a cylindrical rigid sleeve, pref. of ABS styrene, styroacrylonitrile or rigid PVC, reinforced with glass fibres. The sleeve has open ends with a lead-in surface on each; each end has a sealing ring on it, pref. of urethane elastomer, synthetic rubber, or PVC. The ring has a circumferential annular bead of greater dia. than the sleeve's i.d., so that it fits tangentially in the sleeve.

Description

Pipe connection The invention relates to a pipe connection. The invention can find application in connecting relatively large pipes, such as Sewer pipes and the like; it will be used in connection with this use case described.

However, the invention can also be used to advantage with other types of pipes can be applied.

Usually, pipe sections are provided with a socket end (bell-shaped) and with a smooth end (tenon end) and connects two pipes by one the smooth end of one pipe is inserted into the socket end of the other pipe.

Seals are inserted between the smooth end and the socket end; With a conventional seal, sealing rings that interact with one another are opened the smooth pipe end and the socket end. This is a sealing ring made of resilient plastic provided on the inner surface of the socket end; a second sealing ring made of elastic plastic is on, the outer surface of the applied to the smooth pipe end. The sealing rings are sized so that they together engage when the pipe connection is made. With a well-known Both the ring for the socket end and the Rint an annular projection for the smooth pipe end u @@ a sealing surface, which is arranged in such a way that when Hinein @ rilck @ a des smooth pipe end deformed the two annular projections into the socket end to establish the bond so that they pass each other and that they meet the sealing surfaces of the opposite Sealing rings are arranged. When the connection is made, the protrusion act on the sealing ring of the smooth pipe end and the sealing surface on the sealing ring of the socket pipe end together; in addition, the projection act on the sealing ring of the socket end and the sealing surface on the sealing ring of the smooth pipe end together. This interaction on the circumference creates a seal on the pipe connection.

A @ main problem with making pipes with a smooth and a socket end consists in that the sockets are not made of clay of a hard consistency can be shaped.

In the usual molding process, a mold making the socket is used @or brought an extruder head and the socket is formed in the m, with necessarily Clay of a soft consistency or clay softened by admixtures is used After removing the mold, the cylindrical part of the @chres is extruded.

@ies discontinuous work process is necessary @@ @eue and leads - which is even more problematic - because of the @@@@ by admixtures softened @ tone z @ @@@@ deformation of the product to such an extent that @@ In some cases it is necessary to turn the sleeve into a ring in order to achieve an effective Achieve seal.

In addition, clay is known to be brittle; when dealing with the finished Pipes often breaks the socket that receives the mast impact. Also effect the connections formed under pressure great forces on the socket, resulting in a Splitting of the sleeve leads if it has only minor defects.

Socket-ended pipes are also bulky and heavy and therefore lead to considerable transport problems.

The invention is intended to establish a connection between the smooth straight lines Ends of pipes are created to overcome the disadvantages of having a socket end and to avoid smooth ended tubes.

This goal is achieved in that an elastic sealing ring is formed at the smooth end of the tube, which is made, for example, of a urethane elastomer, a synthetic rubber material or made of polyvinyl chloride, with one separate rigid sleeve is used, in the opposite end two smooth Pipe ends can be used.

The term used to describe the separate sleeve starr11 is to be understood relatively. The term is used to indicate that the socket is rigid compared to the sealing rings of the smooth pipe ends, see above that when making a unit between the pipe and the socket, the sealing ring is the component that deforms to allow it to fit together.

Advantageously, the socket made of acrylonitrile butadiene styrene (ABS) or styroacrylonitrile (SAN). These materials tend to creep, when the connection is subjected to shear forces; to get the full effect of the Maintaining seal under severe conditions is suggested to reinforce the sleeve.

The sleeve can be reinforced by using a band of corrosion-resistant Steel is placed tightly around the outer surface of the sleeve, or it can be reinforced are made by inserting fiber material into the sleeve, for example metal threads or asbestos, but preferably glass.

The sealing ring has a sealing bead that extends around the circumference extends and cooperates with the inner surface of the sleeve to close the seal achieve. The sealing bead is preferably in the vicinity of the front end of the sealing ring arranged, i.e. at the end of the ring that faces the socket first, when the connection is established. With the usual socket end and spigot end connection it was common for several reasons to place a sealing bead in the middle between to place the ends of the sealing ring; because neighboring pipes often in their direction differ from each other, one edge of the ring is pulled out of the socket end. It was therefore necessary to make the insert made of urethane or some other elastic Plastic in the sleeve to extend considerably beyond the area in which if the connection is aligned, the seal is effective.

The plastic of the sealing ring is an expensive component the manufacture of these units; This3 problem is also caused by the present one Invention overcome.

Usually there are two beads on the sealing ring of the smooth Pipe ends provided A bead is located on the guide end of the pipe and the other is located a short distance behind it. The bulge at the end of the lining tends to wipe the inner surface of the sleeve when the connection is made which removes foreign matter that may have stuck the seal in the connection C-Ij, e sleeve according to the invention can already be in the manufacturing plant be applied to the pipe in order to damage the pipe end in this way to prevent during transport; but it is also possible to separate the sleeve from the Delivering pipes and inserting the smooth ends of the pipes into the socket Place and place to be carried out.

The present invention provides a tube through which Extrusion can be shaped continuously and in its manufacture it is possible is to use a hard tone mix to avoid the trouble that result from the design with spigot ends and spigot ends.

Further advantages, features and application possibilities of the new invention result from the following description of an exemplary embodiment and the Drawing.

The figures show: FIG. 1 a cross section through the sealing ring according to the invention and the pipe end and Figure 2 shows a cross-section through that inserted into a socket Pipe end.

Tube 10 is made of extruded hard mix clay; at its end 11 its outer edge is beveled at 12. On the end of the pipe is a sealing ring made of a urethane elastomer, such as that for example supplied by Dowe Chemical & Company under the designation "Borafil" the ring 13 is glued to the outer surface of the tube ittles are of numerous known adhesive, it has a lip portion 14 that the bevel 12 on Pipe end 11 fills out.

With sealing ring has an annular sealing bead 15 on its front end 16, which slopes down smoothly at 17, to an inward direction towards the end of the tube to form a cone and a lead-in surface.

A second ring-shaped 1st 18 is arranged at a distance behind the bead 15, which also acts as a seal. The same applies to Wulf in the assembled connection acts as @@ ug, serves to connect the inner surface In FIG. 2 shows a sleeve according to the invention; it shows you proportionately short cylindrical section 20, which is open at its ends 21, 22 and is divided into two equal parts by a rib 23, which consists of the inner surface protrude from the socket.

The sleeve is formed symmetrically to the plane of the ribs 23 and has a substantially cylindrical inner surface 24 which is the sealing surface the sleeve forms. The surface 24 is largely cylindrical, but slightly conical to facilitate removal during injection molding of the sleeve.

Each end of the inner surface of the sleeve is tapered at 25 and 26 designed to form a lead-in that coincides with lead-in surface 15 of the Sealing ring 13 cooperates.

The sleeve is usually molded from an ABS plastic, such as he for example from the Dowe Chemical Company under the name "Tybrene" is distributed.

In the embodiment shown, the sleeve is secured by a band 30 Reinforced from corrosion-resistant steel, which is drawn tightly around the outer surface of the sleeve is.

According to another embodiment, the sleeve can also, for example be reinforced with fibers. In a preferred embodiment of the invention the sleeve can be made of SAN plastic, as it is for example sold by Dowe Chemical Company under the designation Xyril ". This The material can be reinforced by filling it with glass fibers. Very good results can be obtained with fibers approximately 12 mm in length and in an amount of approximately 30 percent by weight. Through this becomes the tendency of the sleeve to creep diminished under large and constant forces that occur when the connection Is exposed to shear forces.

The annular ridge 23 of the inner surface of the groove creates one Stop, against the opposite sides of which the end faces of the pipe ends are exactly when the pipe ends are inserted into the socket. Alternatively, a outer flange or a point of contact near the end of the sealing ring on the Pipe ends are created that touches the end faces of the sleeves to a suitable Arrange the pipe ends inside the socket, in this alternative version it would be possible to extrude the sleeve and abrade the lead-in area instead manufacture the sleeve by injection molding. This is particularly important for bearing tubes (layer pipes) because the molds for injection molding are very expensive. the The point of contact on the sealing ring could also be the shape of a cone on the top Assemble the sealing ring to fit the lead-in surface of the socket.

The sleeves can each be individually attached to the pipe ends in the manufacturing plant be placed on or grown on the spot. When reassembling a lubricant such as liquid soap on the socket and the pipe end applied, wherein the sealing ring is pressed into the sleeve so that he assumes the position shown in FIG.

Claims (14)

Claims 1. Pipe connection between the smooth ends of adjacent pipes, thereby characterized in that one is generally cylindrical and substantially rigid Sleeve is provided with open ends and an insertion surface at each end, that each pipe end is provided with a sealing ring formed thereon, the has an annular sealing bead running around it, which has a larger one Diameter than the inner diameter of the sleeve, so that it is in contact with the Sleeve fits, and that the ring is made of elastic material. 2. Pipe connection with a socket for the tight connection of neighboring ones Pipe ends, characterized in that the pipes have elastic sealing rings at the ends and that the sleeve has a substantially rigid, short cylindrical section which is open at its ends and an introductory surface at each end bostitz; 3. Pipe connection with a socket according to Claim 2, characterized in that that a contact device protrudes into the cylinder to cooperate with the ends of the tubes to limit the path by which the tubes are inserted into the rre will know. iSe pipe connection with socket according to Claim 2, characterized in that it is shows that a corrosion-resistant reinforcement tape is tightly wrapped around the socket is. 5. Pipe connection with socket according to claim 4, characterized in that g e k e n n z It is clear that the tape is made of corrosion-resistant steel. 6. Pipe connection with socket according to claim 2, characterized in that g e k e n n z e i c h n e t that the material of the sleeve is a plastic reinforced with fibers is. 0 pipe connection with socket according to claim 6, characterized in that g e k e n n z e i c h n e t that the plastic with glass fibers is v. Pipe connection with socket according to Claim 2, characterized in that it is possible i c h n e t that the sleeve made of acrylonitrile butadiene styrene, styroacrylonitrile or rigid polyvinyl chloride reinforced with a fiber material. Pipe connection with socket according to Claim 8, characterized in that it is possible i c h n e t that the fibers are made of glass. Pipe connection with socket according to Claim 9, d u r c h e k e n It should be noted that the glass fibers on average have a length between 3/8 and 3/4 inch (9.5 and 19 m p 11. Pipe connection with socket according to claim 9, characterized in that the fiber content of the sleeve is at least 25 percent by weight amounts to. 12. Pipe connection according to claim 1, characterized in that the Sealing ring made of a urethane elastomer, synthetic rubber or polyvinyl chloride consists. 13. Pipe connection according to claim * 1, characterized in that the Sealing bead of the ring is arranged at the end of the sealing ring that is first is inserted into the socket. 14. Pipe connection according to claim 13, characterized in that the Sealing ring has a second sealing bead which is spaced behind the first Sealing bead is arranged. L e r s e i t e