DE102019115298A1 - Coupling ring, welding ring and connecting means to connect two sewage pipes of thermoplastic material together and sewage pipe coupling - Google Patents

Abstract

Coupling ring for connecting a first drain pipe (6) of thermoplastic material with a second drain pipe (5) made of thermoplastic material, wherein the second drain pipe (5) at its end has a molded part which is formed at its end a female part ( 5.1) has a larger inner and outer diameter than the basic diameter of the second tube, wherein the first tube (6) is adapted to protrude into the second tube (5), the coupling ring (1) having a central sleeve portion (1.3) with at its first end in the axial direction a first inwardly projecting ring member (1.1) having a circumferential recess on its lower side, the first inwardly projecting ring member (1.1) having an inner flank, with an inner radius that is suitable to abut the outer circumference of the first tube (6), wherein the middle sleeve part (1.3) at its second end in the axial direction a second protruding ring part (1. 2) adapted to engage with one end of the sleeve part (5.1) of the second tube (5), between the middle sleeve part (1.3) of the coupling ring (1), the first protruding ring part (1.1) and the second protruding ring part (1.2) a space is provided to receive a socket part (5.1) of the second pipe (5) and a welding ring (2) to connect the pipes (5, 6) together, the length of the middle socket part (1.3) being so dimensioned is that a snap connection of the coupling ring (1) with the second tube (5) can be achieved, wherein the coupling ring (1) with one or more openings (4.1, 4.2) is equipped for passing wires (3) of the welding ring (2) The invention also relates to a welding ring, connecting means for connecting two drainage pipes of thermoplastic material and a drain pipe coupling.

Description

When connecting polypropylene (PP) sewage pipes used for drainage in communities, homes, industry or construction, it is important to achieve a durable sealed joint.

To connect sewage pipes of thermoplastic material such as polypropylene or polyethylene, there are different types of joints. In a coupling type for sewage pipes, two sewage pipes are connected to each other with a coupling ring. In this type of coupling, the coupling ring is connected to a pipe fitting at one end of a second sewer pipe. A first tube is then inserted into the assembly, which consists of the second sewer pipe and the coupling ring. A gap between the second sewer pipe, the coupling ring and the inserted pipe is sealed in the prior art with a sealing ring, which consists of rubber material in the prior art.

It is an object of the invention to provide an alternative coupling type for sewage pipes of thermoplastic material, with which a dense and durable pipe connection can be achieved. It is also an object of the invention to provide a coupling of sewer pipes with a coupling ring.

The object of the invention is achieved with a coupling ring, a welding ring, connecting means and a sewage pipe coupling according to the independent claims.

The invention relates to a coupling ring for connecting a first sewage pipe of thermoplastic material to a second coupling pipe of thermoplastic material, the second pipe having at its end a pipe fitting having at its end a sleeve part whose inner and outer diameter is greater than the basic diameter of the second tube. The first tube is designed to project into the second tube. The coupling ring in turn has a central sleeve portion having at its first end in the axial direction a first protruding ring portion having on its lower side a circumferential recess, the lower side away from the first end in the axial direction of the coupling ring to a second end in directed in the axial direction.

The first protruding ring member has an inner flank having an inner radius such that it bears against the outer circumference of the first tube, the middle sleeve portion having at its second end in the axial direction a second protruding ring portion adapted to engage with one of the sleeve portions the second tube, wherein there is a space between the central sleeve portion of the coupling ring, the first inwardly projecting ring portion and the second inwardly projecting ring portion to receive a sleeve portion of the second tube and a welding ring to connect the tubes together. The length of the middle sleeve part is dimensioned so that a snap connection of the coupling ring with the second tube can be achieved. The coupling ring is equipped with one or more openings to pass wires of the welding ring can.

As already mentioned, the second tube has at its end a pipe molding which is formed so that it has at its end a sleeve part whose diameter is larger than the basic diameter of the second pipe. This means that the sleeve part is formed at the end so that its inner and outer diameter is larger than the pipe part of the pipe, so that a first pipe can be inserted into the second pipe to obtain a pipe coupling.

Through this one or more openings, wires of the weld ring can be routed to the outside of the weld ring, where they can be connected to an electrical power source for welding. By passing the wires through an opening in the coupling ring to the outside, damage to the wires is prevented by an inserted tube. Also, bending of the wire ends in the wrong direction is prevented because the wires are fixed in a position for connection to the electric power source. The coupling ring is designed so that instead of a rubber ring, a welding ring can be arranged in the coupling ring. A sealed with the help of a weld ring pipe coupling is particularly durable and can withstand chemical loads.

In one embodiment, the coupling ring for connecting two thermoplastic drainpipes is provided with two openings for the wires of a welding wire.

In another embodiment, the coupling ring for connecting two drain pipes made of thermoplastic material is equipped with two holes for the wires of a welding ring.

In another embodiment, the one or more openings for passing the wires of a welding ring are disposed on a surface of the first inwardly projecting ring portion of the coupling ring, which is directed outward in an axial direction. Preferably, the one or more openings in the coupling ring are arranged to be adjacent to the location are arranged, on which the wires of a welding ring are arranged, which is arranged in the coupling ring, so that the distance from the point of attachment of the wires to the welding ring to the opening as short and direct as possible to prevent twisting and wear of the wires. The coupling ring may be configured such that the second inwardly projecting portion has one or more circumferentially distributed indentations directed radially outward from its interior. The indentations may have a minimum outward depth of about 0.5 mm, but they may also have a depth such that they reach the inner wall of the middle socket portion of the coupling ring. The width of the recess is 1 ... 4 mm, preferably about 2 mm.

Optionally, the coupling ring is provided with one or more notches penetrating a wall of the coupling ring which is aligned in the axial direction, starting from the second site of the coupling ring with the second inwardly projecting part. The length of these notches is preferably 10 ... 15 mm.

A recess or notch in the coupling ring is preferred to allow easy coupling of the coupling ring, as they make the coupling ring more flexible.

A welding ring for connecting a first tube of thermoplastic material to a second tube of thermoplastic material for use with a coupling ring, wherein the welding ring is adapted to be in a space of the coupling ring between a first inwardly projecting portion, a second inwardly projecting portion and to be inserted in a middle sleeve part. The welding ring according to the invention comprises a thermoplastic inner expansion tube having a cavity and a resistance heating wire on the outer surface of the expansion tube, which in turn is surrounded by a plastic sheet layer which, after melting, achieves a tightly connected connection of the adjacent tubes. According to the invention, the welding ring has a substantially rectangular or angular cross section before melting.

In one embodiment, the resistance wire is laid spirally around the expansion tube.

According to one embodiment of the invention, the corners of the cross section of the welding ring are rounded.

Connecting means for connecting a first tube of thermoplastic material to a second tube of thermoplastic material according to the invention comprise a coupling ring according to the invention and a welding ring according to the invention.

For example, the welding ring may be secured to the coupling ring by melting or welding using a plastic sheet member.

A drainage pipe according to the invention comprises a coupling ring according to the invention connected to a pipe molding at one end of the second pipe and a first pipe arranged in the coupling ring. The drainpipe coupling further comprises a welding ring according to the invention arranged in a circumferential space between the first pipe, the second pipe and the coupling ring.

In one embodiment of the drainpipe coupling, the wires of the weld ring are directed outwardly through at least one opening about coupling ring.

A permanently welded, durable connection of thermoplastic, for example, polypropylene sewage pipes using a coupling ring which also withstands roots can be achieved by placing a welding ring in the space of the coupling ring in which a rubber seal is normally placed. In order to insert the welding ring in the coupling, a rubber seal must first be removed from the space of the coupling ring. Thereafter, the welding ring can be arranged. An advantage of connecting sewer pipes to welding rings is that such a joint can withstand longitudinal forces well. Compared to a traditional seal with a rubber seal, it is also more resistant to chemicals from inside the pipe or from outside.

The design of the coupling ring and the weld ring makes it easy to install the coupling ring with the weld ring added, preventing problems with installation and damage to the wires. The shape of the weld ring is adapted to the pipe coupling type, but shaped to provide reliable welding and a durable connection.

The inventive parts are easy to install and still a tightly welded and durable connection of pipes is achieved with a coupling ring.

list of figures

• 1 eine Seitenansicht eines Schweißrings mit Schweißdrähten und einem Kupplungsring
• 2 eine Seitenansicht einer Abwasserrohrkupplung mit einem Schnitt A-A
• 3 eine Draufsicht auf die Abwasserrohrkupplung der 2
• 4 eine Querschnittansicht der Abwasserrohrkupplung der 2, entlang des Schnitts A-A
• 5 ein vergrössertes Detail B der Querschnittansicht der Abwasserrohrkupplung nach 4.

Show it

• 1 a side view of a welding ring with welding wires and a coupling ring
• 2 a side view of a sewage pipe coupling with a section AA
• 3 a plan view of the sewer pipe coupling of 2
• 4 a cross-sectional view of the sewage pipe coupling of 2 , along the section AA
• 5 an enlarged detail B of the cross-sectional view of the sewage pipe coupling after 4 ,

The invention relates to a coupling ring, a welding ring and connecting means to connect a first and a second drain pipe together, and a drain pipe coupling. A first and a second drainage pipe are connected by means of a coupling ring which can be attached to the second pipe with a click connection. In a drain pipe coupling according to the invention, one end of the pipe has a coupling sleeve part having inner and outer diameters larger than the inner and outer diameter of the remainder of the pipe so that the pipe can be connected to another pipe by inserting the other pipe and by using a coupling ring. The coupling is sealed with a welding ring which has been inserted into a space of the coupling ring prior to installation of the tubes and which replaces conventional rubber sealing rings.

A welding ring according to the invention has a thermoplastic inner expansion tube with an inner cavity made of a polymer. A resistance heating wire was placed spirally around the expansion tube and it is surrounded by a plastic sheet layer. The plastic sheet is made of a material that corresponds to the material of the pipes to be joined, with common raw materials being, for example, polyethylene (PE) and polypropylene (PP). During the manufacturing process, the welding ring was heated and pressed into a flat shape, so that the expansion tube was flattened and so that its original round cross-section is now elliptical. During the manufacturing process, the outer shape of the weld ring is also formed. After the welding ring has been installed at the desired location, the welding process can be started. The connecting wires of the resistance wires are connected to a power source, which supplies the wires with power and thus leads to a heating of the surrounding layers. During heating, the expansion tube expands back to its original shape, thus pushing the surrounding layers to the outside. The heat of the Widerstandsheizdrähte also melts the surrounding plastic sheet layer, which is pressed simultaneously against surrounding objects, so the plastic pipes and the coupling ring. This achieves a tight connection between the parts and the ring.

The invention and its components will be explained in more detail with reference to the drawings.

1 shows a side view of a coupling ring 1 and a welding ring according to the invention. In the illustration are also the wires 3 of the welding ring 2 to see.

The ends of the wires 3 may be connected to an external power source to supply power to the resistance heating wires to heat and melt the outer layer of the welding ring and thereby connect to the surrounding pipe parts.

In the 2 An embodiment of the invention can be seen. The illustration shows a cutaway side view of a drainage pipe coupling according to the invention. It includes a coupling ring 1 which in the embodiment is equipped with two openings around the wires 3 a welding ring 2 to be performed in the coupling ring 1 can be installed, with an opening for each wire. The coupling ring 1 is with a fitting at one end of the drainpipe 5 connected. A first drainpipe 6 has been inserted into the coupling ring to form a drainpipe coupling.

3 shows a plan view of the embodiment of the 2 , In the illustration, the upper surface of a coupling ring 1 to see. In the embodiment, the coupling ring is a first hole 4.1 equipped to make a first wire of a welding ring and a second hole 4.2 to perform a second wire of a welding ring.

4 shows a cross-sectional view of a drain pipe coupling according to the invention. One with the second tube 5 to be connected first pipe 6 is in the out of the second tube 5 and the coupling ring 1 formed assembly has been used. The view shows a coupling ring 1 with a molded part at one end of a second Polypropenrohrs 5 connected is.

A welding ring 2 is in a circumferential space between the first pipe 6 , the second pipe 5 and the coupling ring 1 been used to connect the two pipes. In the illustration, the drainpipe coupling is shown prior to heating of the weld ring and thus prior to melting of the heating wire surrounding layer. It can be seen that the welding ring has a substantially angular shape, which is important to the welding ring 2 easy to use in the existing space. Due to the manufacturing process of the welding ring, its corners may be rounded, but only with a radius of 0.1-5 mm.

The wires 3 of the welding ring 2 are passed through at least one opening on an outer surface of the welding ring 1 led to the outside. By the wires so to the outside of the coupling ring 1 be guided, the wires are protected from damage that might otherwise occur for example when the first pipe 6 will be installed.

5 shows an enlarged partial view of the cross-sectional view of 4 , It can be seen that at one end of the Polypropenrohrs 5 a socket part 5.1 is arranged, as well as a protruding ring part 5.3 which is arranged separately from the sleeve part in a direction away from the end. It can be seen that a protruding ring part 1.2 on a second side of the ring 1 with a Einbuchtungsteil 5.2 communicates with the Einbuchtungsteil between the sleeve part 5.1 and the ring part 5.3 is formed. The socket part 5.1 of the second tube 5 is located on a recess in the circumferential direction of an inwardly projecting part 1.1 of the coupling ring. The length of the middle sleeve part 1.3 in the axial direction of the coupling ring 1 is so presumptuous that if the socket part 5.1 is inserted into the coupling ring, the protruding ring part 1.2 of the coupling ring in the Einbuchtungsteil 5.2 can be snapped so that a detachable connection of the parts is achieved.

In the axial direction is the length of the protruding ring member 1.2 dimensioned so that it is at the Einbuchtungsteil 5.2 abuts when the second tube 5 engaged in the coupling ring. The dimension of the inner diameter of a protruding part 1.1 of the coupling ring 1 is designed to be about the outside diameter of a first inserted pipe 6 corresponds, so that a first pipe can be inserted into the coupling ring and a tight connection can be achieved. The illustration shows that the welding ring 2 has a stretch tube inside. A welding ring 2 According to the invention consists essentially of a welding ring 2 with a thermoplastic inner stretch hose 7 with a cavity, wherein a Widerstandsheizdraht is preferably placed spirally around the Dehnschlauch and in turn is covered by a plastic sheet. When current is applied and the resistance heating wire is heated, the inner expansion tube expands due to its material, whereby the outer plastic sheet begins to melt. Due to the expansion of the inner expansion tube, the outer plastic sheet is pressed against surrounding parts, ie a tube and the coupling ring, so that the welding ring closes the space between the sleeve ring 5.1 of the second tube 5 , the protruding ring part 1.1 the coupling ring and the first pipe 6 filled and sealed, so that after melting a tight connection of the abutting pipes is achieved. The pipes are thus sealed by welding the two surfaces and the welding ring together.

LIST OF REFERENCE NUMBERS

1

coupling ring

2

weld ring

3

Wires of the welding ring

4.1

Through hole for the wires of the welding ring

4.2

Through hole for the wires of the welding ring

5

second pipe

5.1

female member

5.2

notch

5.3

protruding ring part

6

first pipe

7

thermoplastic inner stretch hose

8th

Plastic web layer

Claims (13)

Coupling ring (1) for connecting a first drain pipe (6) made of thermoplastic material with a second drain pipe (5) made of thermoplastic material, wherein the second drain pipe (5) has at its end a molding which is formed so that it at its end a sleeve part (5.1) having a larger inner and outer diameter than the basic diameter of the second tube, the first tube (6) being designed to protrude into the second tube (5), the coupling ring (1) having a central sleeve part (5) 1.3) has at its first end in the axial direction of a first inwardly projecting ring member (1.1) with a peripheral recess on its lower side, the lower side away from the first end in the axial direction of the coupling ring (1) is directed in the direction of second end in the axial direction, wherein the first inwardly projecting ring member (1.1) has an inner flank, with an inner radius that fits, on the outer Abutting the circumference of the first tube (6), the middle sleeve part (1.3) having at its second end in the axial direction a second protruding ring part (1.2) adapted to engage with one end of the sleeve part (5.1) of the second tube, between the middle sleeve part (1.3) of the Coupling ring (1), the first protruding ring member (1.1) and the second protruding ring member (1.2) has a space to receive a sleeve part (5.1) of the second tube (5) and a welding ring (2) to the tubes (5 , 6) to connect with each other, wherein the length of the middle sleeve part (1.3) is dimensioned so that a snap connection of the coupling ring (1) with the second tube (5) can be achieved, wherein the coupling ring (1) having one or more openings Openings (4.1, 4.2) is equipped for passing wires (3) of the welding ring (2). Coupling ring (1) after Claim 1 , characterized in that the coupling ring (1) is equipped with two openings for the wires (3) of a welding ring (2). Coupling ring (1) according to one of the preceding claims, characterized in that the coupling ring (1) with two holes (4.1, 4.2) is equipped for the wires (3) of a welding ring (2). Coupling ring (1) according to one of the preceding claims, characterized in that the one or more openings for passing through the wires (3) of the welding ring (2) is or are arranged on a surface of the first inwardly projecting ring part (1.1), which is directed in the axial direction to the outside. Coupling ring (1) according to one of the preceding claims, characterized in that the second inwardly projecting part (1.2) has a recess or a plurality of indentations, which are directed from the inside radially outward. Coupling ring (1) according to one of the preceding claims, characterized in that the coupling ring (1) is provided with a notch or notches penetrating the wall of the coupling ring (1), being aligned in the axial direction, starting from the second side of the coupling ring (1) with the second inwardly projecting part (1.2). Weld ring (2) for connecting a first drain pipe (6) of thermoplastic material to a second drain pipe (5) of thermoplastic material in use with a coupling ring according to Claims 1 - 6 and adapted to be inserted into a space of the coupling ring between a first inwardly protruding part (1.1), a second inward protruding part (1.2) and a middle sleeve part (1.3), the welding ring (2) being a thermoplastic inner expansion hose (7) comprising a cavity, a Widerstandsheizdraht on the outer surface of the thermoplastic inner Dehnschlauchs (7), which in turn is surrounded by a plastic sheet layer (8), which after melting reaches a firm connection of abutting pipes (5, 6), wherein the welding ring (2) has a substantially rectangular or angular cross section before melting. Welding ring after Claim 7 , characterized in that the resistance heating wire is spirally wound around the thermoplastic inner expansion tube (7). Welding ring after Claim 7 or 8th , characterized in that the corners of the cross section are rounded. Connecting means for connecting a first drain pipe (6) of thermoplastic material and a second drain pipe (5) made of thermoplastic material, comprising a coupling ring (1) according to one of Claims 1 - 6 and a welding ring (2) according to one of Claims 7 - 9 , Connecting means after Claim 10 , characterized in that the welding ring (2) is so connected to the coupling ring (1), that a space is present between the inner wall of the coupling ring (1) and the welding ring (2). A drain pipe coupling comprising a coupling ring (1) according to one of Claims 1 - 6 connected to a fitting at one end of a second pipe (5), a second pipe (6) disposed in the coupling ring (1) and a welding ring (2) according to any one of Claims 7 - 9 which is arranged in a peripheral space between the first tube (6), the second tube (5) and the coupling ring (1). Drain pipe coupling after Claim 12 , characterized in that the wires (3) of the welding ring (2) are guided by at least one opening in the coupling ring (1) to the outside.

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