DE202009003394U1 - Pipe for the air duct - Google Patents

Abstract

Pipe for air ducting in ventilation and air conditioning systems of buildings, having a wall of plastic whose flexibility allows bending of the pipe in its longitudinal axis, and with a built-in reinforcement in the wall, which ensures a dimensional stability of the pipe in its cross section, the Pipe has a deviating from the circular shape flattened cross-section, characterized in that the wall (12) consists of a flexible soft plastic material (wall material) and that the reinforcement by a helically wound coil (10) is formed from a dimensionally stable material (Spiral material) and is embedded in the wall (12), wherein the wall (12) within the inner cross section of the coil (10) forms a longitudinally continuous smooth inner wall surface.

Description

The The invention relates to a tube for the air duct in ventilation and air conditioning systems of buildings according to the preamble of claim 1.

at Ventilation, air conditioning, heating systems and the like In buildings, air must be supplied or discharged become. For this purpose, pipelines are necessary in the building be moved. The pipes used must be sufficient Have flow cross-section, be flexible for laying and have sufficient dimensional stability.

From the DE 31 25 499 A1 It is known to produce air duct hoses used in the air conditioning by helically wound film strips, wherein in the overlapping edges of the film strip a helically wound wire is inserted for reinforcement. The production is complicated. The welds can lead to leakage problems. Since the pipes are round, the required flow area leads to unfavorable installation dimensions.

To the pipes space-saving z. B. to be able to lay within a room ceiling or a room floor, it is from the EP 1 724 508 A2 known to form the tube with a substantially rectangular or oval flow cross-section. The tube can thus have a lower installation height with the same flow cross-section. In order to make the tube flexible and with sufficient dimensional stability, the tube is formed as a corrugated tube with a corrugated wall. Thus, this corrugated wall does not affect the flow of air, a second inner smooth pipe wall is inserted into this ge corrugated wall. The double-walled construction makes the production expensive, increases the material requirement and affects the flexibility of the tube.

From the EP 1 346 173 B1 is a generic pipe known, which is designed for a space-saving installation with a flattened cross-section. To ensure flexibility, the tube is designed as a single-walled corrugated pipe. The wave crests of the wall directed into the interior of the pipe are flattened and thickened in the wall thickness. The flattening improves the flow characteristics, while the thickening leads to an improvement in dimensional stability. The different wall thickness makes the production consuming. Above all, there is also a considerable waviness of the inner wall surface, which increases the flow resistance and favors the deposition of dirt.

Of the Invention is based on the object, a pipe for the Air ducting in ventilation and air conditioning systems to create buildings that are simply constructed, a space-saving installation allows a good flexibility has and ensures a good air flow.

These The object is achieved by a tube with the features of claim 1.

advantageous Embodiments of the invention are in the subclaims specified.

The tube according to the invention has one of the circular shape deviating flattened cross-section on top of an oval Be cross-sectional shape out to a rounded rectangular shape forms can. The lower height compared to a round tube allows a space-saving installation, especially within a floor structure or even within lightweight walls or over a suspended ceiling.

The Wall of the tube is made of a flexible soft plastic material, hereinafter referred to as "wall material" To give the tube the necessary dimensional stability is the tube reinforced by a helically wound coil. The helix consists of a dimensionally stable material, the following is referred to as "helical material." The helical material has sufficient strength, so that the helix dimensionally stable is. The helical material in particular allows a certain degree of elasticity, on the one hand necessary for the flexibility of the tube and on the other hand allows a certain cross-sectional deformation.

The helically wound helix is embedded in the wall, wherein the wall material completes the turns of the coil or at least largely encloses. The wall material of the wall encloses in each case If the helix on the inside so far that the wall a in the longitudinal direction continuously smooth inner wall surface forms. This smooth inner wall surface can ideally run in a straight line in the longitudinal direction of the tube can but also a slight ripple caused by the turns of the helix exhibit.

The helix causes the dimensional stability of the pipe, in particular the dimensional stability of the pipe cross-section against external pressure loads. Such pressure loads can be caused for example by persons or objects during the laying of the tubes. In particular, such a pressure load by the building material z. B. causes the applied to the laid pipe screed or the like. The radial compressive strength of the tube is determined by the choice of helical material, the material cross section of the helix and the pitch of the turns of Wendel determines.

The Wall material of the wall allows the pipe walled form the wall, the tightness and flexibility ensured the tube. Above all, the wall forms a smooth inner wall surface, so the flow resistance is low for the air flowing through and dirt and dust deposits are minimized.

In a simple embodiment is the wall of the tube only from a wall material, in which the helix is embedded. The material properties of the tube are thus at its inner and its outer surface the same. Around the pipe to the different requirements on the outer surface and to better adapt the inner surface, the inner wall surface additionally coated or chemically treated. A coating of the inner wall surface is possible by layering the wall of two different materials will be produced. Likewise, a coating can be retrofitted be applied to the inner wall surface of the tube. Finally, it is also possible, the wall inner surface chemically treat the pipe to the material properties to influence the wall inner surface and change.

A such coating or treatment of the inner wall surface allows the choice of wall material to the outside To adapt requirements. This can be, for example, the mechanical requirements arising from the surrounding building materials or the installation conditions. Likewise, this can Be environmental influences, such. B. moisture, chemical Influences, temperature influences or the like. The coating or chemical treatment of the inner wall surface can adapted to the requirements regarding the transported air become. To reduce the build-up of dust and dirt, the wall inner surface may be antistatic. As well it is possible to coat the inside wall surface in this way or to impregnate or treat the wall inner surface a germ and bacteria formation or the emergence of a corresponding Nutrient soil prevented or at least reduced.

to Production of the tube according to the invention is First, the helix in the flattened cross-sectional shape wound by means of a suitably shaped tool. After that The soft plastic wall material is wrapped around the wound coil sprayed an extruder tool. If the wall inside can be treated additionally, then the coating with a second plastic material on the inside be sprayed on. Likewise it is possible, the wall inner surface of the Pipe with a liquid and drying or hardening To coat material. It is also possible, the wall material the wall on its inner surface by an applied chemical substance to be impregnated or chemically transformed.

in the The invention will be explained in more detail below, to the embodiment shown in the drawing Reference is made. Show it:

1 in perspective, a section of the tube, wherein partially the wall is removed to illustrate the structure, and

2 and 3 in each case a longitudinal section through the pipe wall.

The Pipe is used to guide the air in ventilation, heating and air conditioning systems used by buildings. The Pipe is preferably used in floor construction on the bare floor laid.

For this purpose, the tube has a flattened cross-section to allow the lowest possible installation height. In the illustrated embodiment, the tube has an oval cross-sectional shape. For example, the width, ie the largest diameter of the cross-section is about 100 mm and the height, ie the smallest diameter of the cross-section a maximum of about 50 mm, resulting in a free flow area of about 3150 mm ² .

The Cross-sectional shape of the tube is not on the illustrated oval Limited form. It can also be a more rectangular cross-sectional shape be used, with the corners of the rectangular cross-section rounded to allow one hand, the winding of the helix and on the other hand, no corners of the flow cross-section generate air turbulence. The rectangular one Cross-sectional shape may also be modified to the effect that all or even individual side surfaces to the outside slightly bulged bulging.

Around a favorable ratio of height and Flow cross-section is independent preferred by the specific cross-sectional shape that the ratio from width to height of the cross-section is at least 2: 1.

The tube has a helically wound coil 10 on, which causes the dimensional stability of the tube. The helix 10 consists of a helical material which has sufficient strength to afford the dimensional stability of the tube to make. Preferably, the helical material has a certain degree of elasticity, so that the tube can be bent in its longitudinal axis. The For melasticity also ensures that the tube after a brief radial pressure load, z. B. in the laying, assumes its original cross-sectional shape again.

The helix 10 may for example consist of a resilient metal, in particular of a spring steel wire. Likewise, it is possible the helix 10 made of a suitable plastic, eg. As hard PVC, manufacture.

The helix 10 gets into a wall 12 embedded. The wall material of the wall 12 is a flexible soft plastic, z. As soft PVC or soft polyurethane. The wall material is wrapped around the helix 10 sprayed so that the wall material of the wall 12 the turns of the helix 10 encloses at least more than half the circumference. Preferably, the wall material surrounds the wall 12 the helix 10 completely, as in the drawing and in particular in 2 you can see. This ensures that the material of the spiral outward completely through the plastic material of the wall 12 is covered.

It is crucial that the wall 12 the helix 10 on the inside so far surrounds and covers that the wall 12 forms a smooth inner surface in the axial direction of the tube. The inner surface can be completely straight, like this 2 shows. Under a smooth inner surface but also an inner surface of the wall with a small by the periodic turns of the coil 10 conditional ripple understood as this 3 shows.

The radial wall thickness of the wall 12 can be smaller than the material diameter of the helix 10 , which gives one by the helix 10 gives conditional waviness on the outer surface of the tube. The smaller wall thickness of the wall 12 favors the flexible flexibility of the tube and also means a material saving.

The wall inner surface of the wall 12 can with a coating 14 be provided. The coating 14 can be together with the wall 12 be extruded in a two-component process. Likewise, the coating can 14 in a second step on the inner surface of the wall 12 be sprayed. Next, the coating 14 in the manner of a paint job on the inner surface of the wall 12 be applied. Finally, it is also possible, instead of an applied coating 14 an inner surface layer of the wall 12 chemically impregnate or convert.

The coating 14 can be antistatic to avoid electrostatic charge and resulting dust deposits. Furthermore, the coating may contain germicidal and bactericidal or preventing ingredients. The coating 14 If necessary, it can also prevent possible odors or pollutants from the wall material of the wall 12 be delivered to the air flowing through. The coating 14 may in particular consist of polyurethane.

The pipe according to the invention can be used for laying in its axis both in the plane of its width dimension as also perpendicular to the plane of its height dimension be bent flexibly. At the corresponding bending radius is a bend up to 180 ° possible. The tube is preferably manufactured in lengths of 25 to 50 m, so that appropriate Lengths can be laid without hitch be parts. For storage and delivery, the tube can be in this Length be rolled up in a ring.

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 3125499 A1 [0003]
• - EP 1724508 A2 [0004]
• - EP 1346173 B1 [0005]

Claims (17)

Pipe for air ducting in ventilation and air conditioning systems of buildings, having a wall of plastic whose flexibility allows bending of the pipe in its longitudinal axis, and with a built-in reinforcement in the wall, which ensures a dimensional stability of the pipe in its cross section, wherein the Pipe has a deviating from the circular shape flattened cross-section, characterized in that the wall ( 12 ) consists of a flexible soft plastic material (wall material) and that the reinforcement by a helically wound coil ( 10 ) is formed, which consists of a dimensionally stable material (helical material) and in the wall ( 12 ) is embedded, wherein the wall ( 12 ) within the inner cross-section of the helix ( 10 ) forms a longitudinally continuous smooth inner wall surface. Pipe according to claim 1, characterized in that the helix ( 10 ) consists of a form-elastic helical material. Pipe according to claim 2, characterized in that the helix ( 10 ) on an elastically resilient metal, in particular consists of a spring steel wire. Pipe according to claim 1 or 2, characterized in that the helix ( 10 ) made of plastic, in particular made of rigid PVC. Pipe according to one of claims 1 to 4, characterized in that the wall ( 12 ) consists of PVC or polyurethane. Pipe according to one of the preceding claims, characterized in that the helix ( 10 ) completely of the wall material of the wall ( 12 ) is included. Pipe according to one of the preceding claims, characterized in that the radial wall thickness of the wall ( 12 ) smaller than the material diameter of the helix ( 10 ), whereby a corrugated outer surface of the tube is formed. Pipe according to one of the preceding claims, characterized in that the wall inner surface of the wall ( 12 ) is coated or chemically treated. Pipe according to claim 8, characterized in that the wall material of the wall ( 12 ) is adapted to the mechanical requirements and environmental influences, and the inner wall surface is adapted to the air transport. Pipe according to claim 9, characterized in that the wall inner surface is antistatic and / or nucleation is designed to prevent. Pipe according to one of claims 1 to 10, characterized characterized in that the tube has an oval cross-section. Pipe according to one of claims 1 to 10, characterized in that the tube has a rounded rectangular Cross section has. Pipe according to one of claims 1 to 10, characterized in that the tube is arcuate having a curved cross-section. Pipe according to one of claims 11 to 13, characterized characterized in that the ratio of width to height of the cross section is at least 2: 1. Pipe according to claim 14, characterized in that the pipe cross-section has a width of about 100 mm and a height of a maximum of about 50 mm. Pipe according to one of the preceding claims, characterized in that the helix ( 10 ) is wound by means of a tool corresponding to the cross section of the pipe and that the wall ( 12 ) in an extruder die around the helix ( 10 ) is sprayed. Pipe according to one of the preceding claims, characterized in that the tube lengths of about 25 manufactured up to 50 m and ring-shaped for storage and delivery rolled up.