FR2575537A1

FR2575537A1 - Accessory, called "reduction plate", intended to ensure the connection of two pipelines of different diameter, and method for producing this accessory

Info

Publication number: FR2575537A1
Application number: FR8500014A
Authority: FR
Original assignee: GERU CLAUDE
Current assignee: GERU CLAUDE
Priority date: 1985-01-02
Filing date: 1985-01-02
Publication date: 1986-07-04

Abstract

Accessory, called "reduction plate", intended to ensure the connection of two pipelines of different diameter, and method for producing this accessory. It consists of two coaxial tubular portions, connected by a common bottom, consisting of a flared conical portion 10 extended by a plane portion 11. The tubular portion of large diameter, of length H, has an annular shoulder separating the two zones of slightly different diameter 14 or flared 12. The free end has an edge 13 which extends radially towards the outside. The tubular portion, of smaller diameter, extends beyond the plane P of the free end of the tubular portion of large diameter.

Description

La présente invention concerne la fabrication d'un accessoiredit réduction plate, destine à assurer le raccordement de deux longueurs de gaines, ou de conduits de diamètres differents, notamment dans les installations de chauffage ou de ventilation. The present invention relates to the manufacture of a flat reduction accessory, intended to ensure the connection of two lengths of ducts, or of ducts of different diameters, in particular in heating or ventilation installations.

Elle concerne egalement le procédé pour fabriquer cet accessoire. It also relates to the process for manufacturing this accessory.

Actuellement, pour réaliser le raccordement de deux gaines de diamètres différents, on dispose de deux type d'accessoires dénommés respectivement " réduction plage " et "réduction conique". On a représenté ces deux accessoires comme aux figures I et 2 des dessins. Currently, to make the connection of two ducts of different diameters, there are two types of accessories called "range reduction" and "conical reduction" respectively. These two accessories are shown as in Figures I and 2 of the drawings.

La réduction plate permet de disposer d'un raccordement entre deux gaines ayant un encombrement pratiquement nul,ce qui permet de relever les cotes de l'installation et de prédécouper les gaines sans tenir compte des raccords. L'inconvénient de la réduction plate actuelle, est que cet accessoire provoque une pet te de charge dans le fluide s'écoulant à l'intérieur des gaines. Par ailleurs, La fabrication traditionnelle de la reduction plate, qocasionne un coût relativement élevé et une fragilité mécanique de cet accessoire.The flat reduction makes it possible to have a connection between two ducts having a practically zero bulk, which makes it possible to raise the dimensions of the installation and to pre-cut the ducts without taking account of the connections. The disadvantage of the current flat reduction is that this accessory causes a small charge in the fluid flowing inside the sheaths. Furthermore, the traditional manufacture of the reduction plate, qocasionne relatively high cost and mechanical fragility of this accessory.

En revanche, la réduction conique permet d'éviter ces pertes de charge, mais elle présente des dimensions, notamment une longueur, dont il faut tenir compte dans l'installation. ce qui pose un certain nombre de problèmes délicats pour le calcul de la longueur exacte des garnes. On the other hand, the conical reduction makes it possible to avoid these pressure drops, but it has dimensions, in particular a length, which must be taken into account in the installation. which poses a certain number of delicate problems for calculating the exact length of the stations.

La présente invention propose un nouveau type d'accessoire, voisin de la réduction plate, qui concilie les avantages respectifs de la réduction plate traditionnelle (encombrement nul) sot de la réduction conique traditionnelle tpeu de perte de charge), tout en en éliminant les inconvénients. The present invention provides a new type of accessory, similar to the flat reduction, which reconciles the respective advantages of the traditional flat reduction (zero bulk) under the traditional conical reduction (little pressure loss), while eliminating the drawbacks .

A cet égard l'accessoire de l'invention comporte classiquement, deux parties tubulaires coaxiales liées par un fond commun, mais cet accessoire est caractérisé par le fait qu'il est réalisé par repoussage et fluotournage, en une seule pièce de métal, le fond reliant les-deux parties tubulaires est constitué par une partie conique évasée (10), prolongée par une partie plane /lit, perpendiculaire à l'axe commun des parties tubulaires et de largeur inférieure à la distance séparant les deux dites parties tubulaires
Toujours selon l'invention, la hauteur de la partie conique est de préférence inférieure à la hauteur de la partie tubulaire de plus grand diamètre. Les deux parties tubulaires s'étendent dans le même sens à partir du fond. In this regard, the accessory of the invention conventionally comprises two coaxial tubular parts linked by a common bottom, but this accessory is characterized by the fact that it is produced by embossing and flow-turning, in a single piece of metal, the bottom connecting the two tubular parts is constituted by a flared conical part (10), extended by a flat / bed part, perpendicular to the common axis of the tubular parts and of width less than the distance separating the two said tubular parts
Still according to the invention, the height of the conical part is preferably less than the height of the tubular part of larger diameter. The two tubular parts extend in the same direction from the bottom.

De plus, la partie tubulaire de plus petit diamètre s'étend au delà de l'extrémité libre de la partie tubulaire de plus grand diamètre afin d'obbenir un bon chevauchement des g#aines ou conduits à raccorder. In addition, the tubular part of smaller diameter extends beyond the free end of the tubular part of larger diameter in order to obtain a good overlap of the g # gines or conduits to be connected.

Dans la présente invention, la partie tubulaire de plus grand diamètre est constituée de deux partie tubulaires de diamètre légèrement différent. Le plus petit diamètre s'étend, à partir du fond, sur une longeur th). Le plus grand diamètre, d'une longueur (h') se termine par un bord tombé extérieur (13).FlG 3. In the present invention, the tubular part of larger diameter consists of two tubular parts of slightly different diameter. The smallest diameter extends, from the bottom, over a length th). The largest diameter, of a length (h ') ends with an outer fallen edge (13) .FlG 3.

La partie tubulaire de plus grand diamètre peut être également constituée, d'une partie conique évasée (12) > en pointillé sur le dessin 3. s'étendant sur toute la longueur H, et reliant le fond au bord tombé extérieur (13). The tubular part of larger diameter may also consist of a flared conical part (12)> in dotted lines in the drawing 3. extending over the entire length H, and connecting the bottom to the outer fallen edge (13).

Le procédé, pour réaliser l'accessoire à partir d'une seule pièce de métal, est caractérisé par le fait que
- On part d'un flan métallique circulaire, percé d'un trou csntral. The method for making the accessory from a single piece of metal is characterized in that
- We start with a circular metal blank, pierced with a central hole.

- On réalise la partie tubulaire de plus petit diamètre, par repoussage en fluotournags, partir de la zone intérieure du flan. - The tubular part of smaller diameter is produced, by pushing back in flowturns, starting from the interior area of the blank.

- On réalise ensuite, par reprise sur un mandrin conique et par -fluoprojection > la partie conique du fond. - Then, by taking up on a conical mandrel and by -fluoprojection> the conical part of the bottom.

- - Puis on forme la partie tubulaire de plus grand diamètre, sur un mandrin creux, par repoussage et rétreint. - - Then the tubular part of larger diameter is formed, on a hollow mandrel, by pushing and shrinking.

On décrit a présent lrinvention, à titre d'exemple non limitatif, en référence aux dessins annexés dans lesquels
La figure 1 représente une réduction plate traditionnelle
La figure 2 représente une réduction conique traditionnelle.The invention is now described, by way of nonlimiting example, with reference to the accompanying drawings in which
Figure 1 shows a traditional flat reduction
Figure 2 shows a traditional conical reduction.

La figure 3 est une coupe axiale d'un accessoire selon la présente invention. Figure 3 is an axial section of an accessory according to the present invention.

Les figures 4 et 5 montrent respectivement des raccordement entre deux gaines, par l'intermédiaire d'une part. figure 4, d'une réduction coniquetfaditionnelle, et d'autre part, figure 5, d'un accessoire ~selon l'invention. Figures 4 and 5 show respectively connections between two sheaths, via a share. Figure 4, a coniquetfaditionionnel reduction, and secondly, Figure 5, an accessory ~ according to the invention.

Les figures 6, 7, 6 et 9 montrent les quatre étapes successives de fabrication de l'accessoire selon l'invention. Figures 6, 7, 6 and 9 show the four successive stages of manufacture of the accessory according to the invention.

Claims

13 Accessory called flat reduction, intended to ensure the connection between two lengths of sheaths, or conduits of different diameters and comprising two coaxial tubular parts, linked by a common bottom, characterized in that the accessory is produced in a single piece of metal and the bottom connecting the two tubular parts is constituted by a flared conical part (10), extended by a flat part l113 perpendicular to the common axis of the tubular parts and of width less than the distance separating the two said tubular parts .

2) Accessory according to claim 1, characterized in that the height (h) of the conical part (1fl) j is less than the height of the tubular part (H) of larger diameter.

3) Accessory according to any one of claims 1 or 2 characterized in that the two tubular parts- extend in the same direction from the common bottom (10-Il).

4) Accessory according to any one of # claims 1 to 3 characterized in that the tubular part of smaller diameter extends beyond the plane [P] of the free end of the tubular part of larger diameter.

5) Accessory according to any one of claims 1 to 4 characterized in that the tubular portion of larger diameter is slightly flared from the bottom. (L2)

6) Accessory according to any one of claims 1 to 5 characterized in that the tubular part of larger diameter has an annular shoulder, separating two zones of slightly slightly different diameter, the zone of smaller diameter connecting directly to the bottom of the 'accessory.

7) Accessory according to any one of the preceding claims, characterized in that>, - the free end. of the tubular part of larger diameter, has a rim perpendicular to the axis of the accessory and extending radially outwards.

8) Method for manufacturing the accessory according to any one of the preceding claims, characterized in that:

- We start with a metallic-circular blank pierced with a central hole.

by spinning in flow forming from the interior area of the blank.

- We realize the tubular part of smaller diameter

- Then, by taking up on a conical mandrel and by flusprojection, the conical part of the bottom.

- The tubular part of larger diameter is formed on a hollow mandrel, by pushing and shrinking.