Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Patent
1992-01-10
1993-10-26
Cuda, Irene
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
29428, 138 43, B23P 1500
Patent
active
052554341
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a process for the continuous production of an irrigating tube according to the preamble of claim 1 as well as an apparatus for carrying out this process according to claim 8.
For optimum plant growth, not only is it necessary to supply an adequate amount of light and heat, but also to let the plants have sufficient moisture. In regions in which the climatic conditions are generally dry, it is therefore customary to use irrigation systems for watering of the plants. Owing to the inherent disadvantages of these systems (evaporation, scorching of the plants in places), trickling irrigation systems have been developed which can deliver the desired moisture directly to the area around the roots of the plants.
These systems comprise tubes which are laid along the rows of plants and are provided at regular intervals with small orifices from which water can trickle, the said water having been fed into the tubes from a central water supply.
Such devices have been improved by special measures to the extent that the rate of delivery from the tubes can be set pressure-independently. For this purpose, U.S. patent specification 4,210,287, for example, provides for there to be arranged on the inside of a long tube, underneath the orifices, valve elements (trickling elements) which allow a uniform quantity of water per unit of time to pass through over a wide pressure range of the water fed through the tubes. Such trickling elements have a diaphragm, which constricts a meandering passage to a greater or lesser extent, depending on the water pressure.
The trickling elements known from this publication are welded to the inside of the tube. In order to improve the connection of the trickling elements to the tube, this citation provides for the tube to be thickened in the region of the trickling elements.
In the case of this type of connection of trickling elements and tube, none of the large number of trickling elements within a tube may become detached from the tube or have a leak in the connecting region between trickling element and tube, since otherwise considerable losses of water can occur. There is the risk of the trickling elements becoming detached from the wall of the tube, in particular when handling the tube and reeling-up.
U.S. Pat. No. 4,817,875 discloses another tube arrangement, in which similar trickling elements are inserted from outside into clearances of an inner tube, which has a perforation in the region of the trickling elements. Both trickling elements and inner tube are additionally surrounded by an outer tube, which likewise has a passage in the region of the trickling elements. The inserting of the trickling elements between an inner tube and an outer tube provides a greater safeguard against losses from leakage, since the trickling elements are fastened both with respect to the inner tube and with respect to the outer tube, so that there is a double safeguard against losses from leakage.
It has been found in practice that the method of production specified in this publication for inserting the trickling elements into clearances of the inner tube is not practicable.
Therefore, the underlying object of the invention is to provide a process and an apparatus for the continuous production of an irrigating tube of the type specified in U.S. Pat. No. 4,817,875 which permits a simple, cost-effective and high-quality production of such an irrigating tube.
This object is achieved by the invention specified in claim 1. Advantageous further developments of the invention are specified in subclaims.
According to the invention it is provided that, after extrusion of an inner tube and subsequent cooling of the tube, the latter is perforated at regular intervals to produce inlet orifices, that the tube is subsequently heated up again, at least in the region of the perforations, and that thereafter a trickling element is pressed into the surface of the inner tube in each case at the heated-up perforation point and is thereby connected to the inner tube. Inner tube and trickling elements are
REFERENCES:
patent: 4122590 (1978-10-01), Spencer
patent: 4817875 (1989-04-01), Karmeli
patent: 5146666 (1992-09-01), Babbitt
Dietrich Karl
Sorgel Fritz P.
Cuda Irene
Drossbach GmbH & Co.
Freiburger Thomas M.
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