DE202007004945U1 - Double-walled tube for transporting loose material, fluids or pastes has outer casing of thin-walled metal and inner casing of thick walled plastic tube - Google Patents

Abstract

A double-walled tube for transporting loose material, fluids or pastes comprises an outer casing (12), preferably of thin-walled metal and an inner casing (14), preferably of thick-walled plastic tubing. Preferably the outer and inner casings are firmly connected together by exact size matching and preferably the tube is produced by pressing the inner casing into the outer part in lengths of up to 5 m.

Description

The The present invention relates to a double-walled production pipe and concerns the area of transport or the transport of bulk material or liquids.

State of technology

delivery lines as a connection of conveying pipes with rotating conveyor spirals inside or screw conveyors are used in many fields to loose bulk such as Powders or granules or liquid or pasty masses to transport.

application areas are the food industry, agriculture with feed for animals that Construction industry with building materials such as sand, etc. and many more.

By Choice of dimensions of pipe and screw or spiral can one relatively accurate metering of the transported bulk quantity can be achieved by adjusting the rotational speed of the screw or Spiral can be the amount transported per unit time very easy be varied.

delivery lines be in the majority of cases made of straight pipe sections, cut from rods of for example 5 m length, by bending or using fittings such as angles, etc. usually by means of press connections.

A mobile conveyor for loose bulk with a stable, straight conveyor tube is from the DE 10 2005 030 695 A1 known.

From the DE 101 46 540 A1 For example, a screw conveyor is known in which the delivery line is flexible.

One relatively new, but rapidly growing, field of application for these materials handling is the heating of buildings with renewable fuels such as wood chips or pellets. The delivery pipes here are mostly made of a metal. A major disadvantage of these metal tubes is that the screws or spirals through the Rotation in the tube will wear out quickly.

double Tubes, in turn, are known from other applications such as for example, the building services, where double-walled pipes as sewers used to the sound transmission of the flowing in the pipe, and in particular in the so-called downpipes vertically downwards tumbling, Sewage into the building to reduce.

All here known double-walled tubes are made in rods, cut to the required dimensions and over so-called fittings such as angles, arches, etc. to a pipe system get connected. This type of processing is very time consuming and thus costly.

task

The Object of this invention is now for the promotion of loose bulk materials a delivery pipe provide, which has the known advantages, also the wear reduces the rotating spirals, also easier to work with is and possibly also the noise emission reduced by the spiral rotating in the pipe.

The new conveyor pipe It should not be much more expensive to produce as a simple metal tube.

These The object is achieved by a delivery pipe solved with the features of claim 1.

embodiment

Further Details, features and advantages will be apparent from the following Description of an embodiment shown in the drawings a conveyor pipe, as well as from the subsequent Claims.

It demonstrate:

1 a perspective view of a pipe section with partially removed outer jacket

2 a cross section through the pipe

3 a longitudinal section through the tube along the axis AA in 2

4 a detail from the longitudinal section in 3

1 shows the tube 10 consisting of an outer jacket 12 For example, a thin-walled pipe made of a metal such as stainless steel, galvanized steel, or the like, and an inner shell 14 For example, a relatively thick-walled pipe made of a plastic or the like. Both tubes are available in many variations as standard on the market. The cross section of these tubes is usually circular, they are referred to as round tubes.

The material of the inner jacket 14 is advantageously not too hard, but relatively tough, and thus on the one hand very resistant to abrasion by the in the pipe 10 rotating spiral, on the other hand causes this material but also little abrasion on the spiral, which is usually made of a metal. For the inner jacket 14 For example, a polyethylene (PE) or a polypropylene (PP) is used.

2 and 3 show this tube 10 in further views.

4 shows an end of a pipe 10 in detail. Here is a phase 16 in the outer jacket 12 , the metal tube, recognizable. This phase 16 is before the production of the composite pipe 10 for example, by grinding one end of the tube for the

outer sheath 12 appropriate. The production of the composite pipe 10 done by a rod tube as inner jacket 14 in an equal length rod tube as outer jacket 12 is pushed.

If the inner diameter of the outer jacket 12 is chosen slightly smaller than the outer diameter of the inner shell 14 , high forces are required for this process, since the plastic tube during pressing through the phase 16 on the metal tube, which then acts like a cutting edge, is peeled off. This production process is technically easy to control with tubes of up to about 5 m in length.

It creates a very strong bond between the two tubes with the advantage that this composite tube 10 then even with the help of known bending devices without damage to the pipe can be bent to a certain extent. This eliminates the need for fittings and makes it much easier to install a delivery pipe made from bent pipe sections.

10

delivery pipe

12

outer sheath

14

inner sheath

16

phase

Claims (6)

Delivery pipe ( 10 ) for the transport of bulk material and liquid or pasty masses, characterized in that the conveying tube ( 10 ) as a composite pipe from an outer jacket ( 12 ), preferably a thin-walled metal tube, and an inner shell ( 14 ), preferably a thick-walled plastic pipe. Delivery pipe ( 10 ) according to claim 1, characterized in that the outer jacket ( 12 ) and the inner jacket ( 14 ) are very firmly connected to each other via a very precise fit. Delivery pipe ( 10 ) according to at least one of the preceding claims, characterized in that the tube ( 10 ) is produced by pressing the inner shell ( 14 ) in the outer jacket ( 12 ), in each case from rods of the corresponding tubes, for example, up to 5 m in length. Delivery pipe ( 10 ) according to at least one of the preceding claims, characterized in that the outer jacket ( 12 ) at least one end of a phase ( 16 ), which in the manufacture of the tube ( 10 ) acts as a cutting edge and by peeling the inner shell ( 14 ) a very accurately fitting and thus firm connection between outer shell ( 12 ) and inner jacket ( 14 ). Delivery pipe ( 10 ) according to at least one of the preceding claims, characterized in that the inner shell ( 14 ) consists of a material which is very resistant to abrasion by those in the pipe ( 10 ) rotating, usually metallic spiral, on the other hand causes little abrasion on the spiral, preferably of a polyethylene (PE) or a polypropylene (PP). Delivery pipe ( 10 ) according to at least one of the preceding claims, characterized in that in the composite pipe, the connection between the outer jacket ( 12 ) and inner jacket ( 14 ) is so firm that the pipe ( 10 ) despite an otherwise brittle inner mantle ( 14 ) plastically deformed without damage, for example, bent, can be.