DE19607741A1 - Clamping system on end of pipe - Google Patents

Abstract

The coupling device may be used to join e.g. a nozzle or nipple onto the end of a copper or steel pipe. It has an outer sleeve (1) which may abut a flange (3) on the nozzle or nipple and traps a small-section O-ring (4) made of rubber. The outer sleeve has a shoulder which may accommodate a slightly larger diameter O-ring (2) which may bear against the pipe or an inner sleeve. The outer sleeve has four equispaced threaded bores accommodating clamping screws (5) arranged with their heads facing outwards. If a steel pipe is used, the screws clamp directly onto the outer diameter of the pipe and they pass through bores in a thin inner sleeve (6). If a copper pipe is used, the sleeve is thicker and the clamping screws bear against the ends of blind bores, to deform the sleeve to grip the pipe over a wider area.

Description

It is known to connect pipe and valve connections by means of crimping, cutting ring, flanging, or to produce threaded connections, the tightness of which depends on the use Purpose is achieved by inserted sealing elements.

Crimp fittings for various pipe cross sections also belong to the state of the Technology.

However, these previously known connection techniques had the disadvantage that they each for one certain pipe material and nominal diameter are procured. Everyone in the camp had to do it A certain number of screw connections are available, to choose the right one from the multitude of pipe connections.

The necessary storage conditions also had to be in place to ensure the right one in an emergency Having the connection within easy reach.

The most common pipe and valve connections in the gas and water installation and central heating construction

• 1. Steel pipes, threaded pipes according to DIN 2440 and 2441, black and galvanized 3/8 ′ ′, 1/2 ′ ′, 3/4 ′ ′, 1 ′ ′, 1 1/4 ′ ′, 1 1/2 ′ ′, 2 ′ ′
• 2. Copper pipes according to DIN 1786 10 mm to 54 mm diameter
• 3. PE pipes according to DIN VPE pipes according to DIN 10 mm to 63 mm diameter
  • to 1. In addition, intermediate sizes can also be found, e.g. B. boiler tubes according to DIN 2448/1626, mostly only welded connections are possible here.
    For steel pipes according to DIN 2440/2441, normal threaded connections are conical or flat sealing or crimp connections (e.g. Gebo) are common.
    Mixed installations (black steel pipe and copper pipe) are often installed in heating construction. As a result, the Gebo screw connection cannot be used, as this is only available in galvanized steel. Execution is offered.
  • to 2. Almost only soldered fittings are used for copper pipes. Crimp fittings are only available in small dimensions.
  • Re 3. For plastic pipes, PE, VPE and different pressure levels, different screw connections are installed for different materials.

For all pipe materials are:
Flush-mounted: only permanent connections are permitted
Surface mounting: detachable connections (screw connections) permitted.

The invention specified in claim 1 is based on the problem for which Surface installation of pipes, the unmanageable and diverse possibilities and reduce the associated large inventory to a manageable level.  

This problem is due to the features of the pipe and listed in claim 1 Valve connection, basic body and various plug-in parts released.

The advantages achieved by the invention are, in particular, that each a basic version (e.g. dimensions from 3/8 ′ ′ to 2 ′ ′) is available (7 pieces), which can be converted to any pipe material with the appropriate plug-in parts.

With the previously known pipe fittings it was impossible without prior information Bring the correct pipe fitting to the site.

Up to now, there were previously to re-connect all types of pipes encountered with fittings approx. 30 complete pipe screw connections required (10 to 63 mm diameter). This was almost impossible due to weight, space and cost reasons.

Here the pipe and valve connection with different plug-in parts is clearly in the Advantage, because with 7 basic bodies from 3/8 '' to 2 '' and the corresponding plug-in parts every pipe connection can now be made (10 mm to 63 mm diameter).

The required plug-in parts are weight and space-saving as well as cheaper as complete screw connections. There can now be an emergency case for customer service vehicles be put together. The customer service technician now has the right one in any case Connection immediately available.

The installation conditions on site often have a professional installation due to cramped conditions Space constraints. The existing pipelines were on each other Ceilings and walls laid so closely that the tools required for assembly are almost not could be applied, e.g. B. Pipe wrenches for tightening and holding.

The pipe and fitting connection according to claim 1 has no, as usual over nut, so no large pipe wrenches are required for tightening. The Tightening is done with a pin key (Allen key). The basic body seals on a rubber O-ring at the stop of the connection nipple, which is several times No need to follow up with pliers. Only a small train is required and that Base body sits tight and tight.

An embodiment of the invention is shown in the drawing and will be described in more detail below described.

It shows

Fig. 1 pipe and valve connection set up for steel pipe side view (section)

1 basic body
2 rubber o-ring
3 connection nipples
4 rubber o-ring
5 locking screws (4 pieces)
6 Insert part for steel pipe

Fig. 2 pipe and fitting connection set up for copper pipe side view (section)

1 basic body
2 rubber o-ring
3 connection nipples
4 rubber o-ring
5 locking screws (4 pieces)
6 Insert part for copper pipes
7 rubber o-ring
8 reducing ring

Fig. 3 insert for steel pipe side view (section)

Fig. 4 insert for steel tube top view

5 locking screws (4 pieces)

Fig. 5 for copper pipe insertion side view (section)

7 rubber o-ring
8 reducing ring

Fig. 6 insert for copper pipe top view

5 locking screws ( 4 pieces)

Fig. 7 insert for plastic pipe side view (section)

7 rubber o-ring
8 reducing ring

Fig. 8 insert for plastic tube top view

5 locking screws (4 pieces)

The embodiment shown in the drawing Fig. 1 is set up for the connection of steel pipe spigot ends without thread, the connecting nipple to socket connections (fitting) or fittings with internal thread connection.

Steel pipes

For assembly:

• 1. The steel pipe tip to be connected must be perpendicular to the pipe axis be separated and free of degrees.  
• 2. The pipe end is in the length of the base body, from all buildup such as rust, paint or mortar residues.
• 3. The tip end is easy to grease with silicone grease.
• 4. The connection nipple ( 3 ) can be sealed into the fitting or fitting connection on the workbench.
• 5. The fit of the rubber O-ring ( 2 ) in the base body ( 1 ) is checked and the plug-in part ( 6 ) is inserted.
• 6. The locking screws ( 5 ) are slightly tightened, the insert is rotated so that the 4 locking screws ( 5 ) fit into the 4 holes in the insert.
• 7. The base body with the pre-assembled insert is on the the end of the steel pipe to be connected is pushed on.
• 8. The object prepared with the sealed connection nipple ( 3 ) is held against the tip end of the steel pipe with the connection thread.
• 9. The base body is screwed onto the connection thread of the connection nipple ( 3 ) up to the stop.
• 10. After alignment, the 4 locking screws ( 5 ) are fully tightened.

When tightening the locking screws, they first hit the bevel cut of the 4 holes in the insert. The resulting pressure is transferred from the insert to the Rubber O-ring transferred, which thereby to the walls of the base body and the steel tube is pressed and thus the tightness is achieved. The locking screws hit after Oblique cut on the steel tube and are easily tightened into the surface of the Steel pipes pressed in. This achieves the necessary mechanical strain relief.

Copper and plastic pipes

For assembly:

• 1. The copper or plastic pipe tip to be connected must be at right angles separated from the pipe axis and free of any degree.
• 2. The pipe end is in the length of the base body from all buildup such as cleaning paint or mortar residues.
• 3. The tip end is easy to grease with silicone grease.
• 4. The connection nipple ( 3 ) can be sealed into the fitting or valve connection on the workbench.
• 5. The fit of the rubber O-ring ( 2 ) in the base body ( 1 ) is checked and the reducing ring ( 8 ), the rubber O-ring ( 7 ) and the plug-in part ( 6 ) are inserted into the base body.
• 6. The locking screws ( 5 ) are slightly tightened, the insert is turned so that the 4 locking screws ( 5 ) fit into the 4 holes in the insert.
• 7. The base body with the pre-assembled insert is to be attached to the closing tip end of the copper or plastic tube pushed on.
• 8. The object prepared with the sealed connection nipple ( 3 ) is held with the connection thread against the tip end of the copper or plastic pipe.
• 9. The base body is screwed onto the connection thread of the connection nipple ( 3 ) up to the stop.
• 10. After alignment, the 4 locking screws ( 5 ) are fully tightened.

When tightening the locking screws ( 5 ), they first hit the oblique cut of the 4 holes in the plug-in part ( 6 ). The resulting pressure is transferred from the insert ( 6 ) to the rubber O-ring ( 7 ), the reducing ring ( 8 ) and the rubber O-ring ( 2 ). The rubber O-ring ( 7 ) is pressed against the walls of the reducing ring ( 8 ) and the tube. The reducing ring ( 8 ) seals on the rubber O-ring ( 2 ).

The tightness of the connection is thus established.

The 4 locking screws ( 5 ) meet the stop in the plug-in part after the bevel cut. When tightening further, the walls of the plug-in part ( 6 ) are pressed onto the pipe walls. The teeth in the male part easily penetrate the surface of the tube. This achieves the necessary mechanical strain relief. The compression in the insert part ( 6 ) is taken up by 4 relief slots.

Claims (2)

1. Pipe and fitting connection (pipe screw connection), detachable connection, for surface installation, in the sanitary and heating technology, characterized in that the pipe and fitting connection with a base body per nominal size and different plug-in parts is to be used for several pipe materials. 2. Pipe and valve connection according to claim 1, characterized, that the pipe and fitting connection has no union screw connection. Tightness and tensile strength is achieved by tightening locking screws reached.