DD204525A1 - PIPE CUFF BRUSH WITH CYLINDRICAL CONNECTING PLUGS - Google Patents

Abstract

The invention relates to Rohrkruemmer, preferably Ofenrohrkruemmer, Kruemmer for air lines u.ae. with cylindrical connecting pieces. The aim is their cost-effective production and the improvement of their use value. The invention had the task of thin-walled preformed sheet metal half-shells enamelling, optimal streaming technically designed in d. Flow direction to create smooth, tight Rohrkruemmer. The attachment takes place by folding longitudinally over the outer and inner radius of curvature to stabilize the Kruemmers. To facilitate the connector apart from the folding of the cylindrical connecting piece and an overlap provided.

Description

Title of the invention

Sheet metal elbow made of sheet metal with cylindrical connecting piece

Field of application of the invention

The invention relates to elbows made of thin-walled embossed bending half-shells with cylindrical connecting pieces, preferably as a stovepipe bend, manifolds for air ducts u * ä «

Characteristic of the known technical solutions

Pipe elbows made of die produced medium thickness sheet metal half-shells by welding are known. In the case of thin-walled half-shells, the perfect welding of the longitudinal seams fails due to the local thermal stresses occurring and the consequent distortions of the free puck edges. The preparation is complicated, in particular by relatively high rejects and rework.

Ofenrohrkrümiaer au3 straight longitudinally folded metal tube with introduced in its fold to both sides leaking beads are common. The Sickung shortens the Ifelzseite the pipe and leads, carried out over a certain distance, to the pipe curvature. disadvantageous in the production of the labor required to bring in a larger number of beads, associated with the risk of unwanted leaks in PaIz and poor iliiillisability through the beads.

23RF7

In addition, in the application of the stovepipe bend the transverse to the media flow beads cause undesirable flow resistance and vortex. Characteristic of this is that kiln elbows burn first in the beads.

Sine variant of the above solution, only in tightness and durability even less favorable, is a manifold which is formed from a rounded to the tube overlapped sheet metal blank by introducing the described beads transverse to the flow direction and only connected in the connection piece by welding points.

Sin flattening the beads with inside radially acting pressure rollers allowed a slightly better flow behavior and better appearance. Each bead was leveled for himself and the additional work required for it was out of proportion to the fluidic improvement, especially since the other disadvantages remain. This explains that this invention has found no wider application.

Folded sheet metal pipes cut to a miter in the shape of a sector with beaded, welded on their circumference, soldered or otherwise associated splitter are often used in ventilation technology and for gutter downpipes as manifold. Their production is predominantly artisanal in character and is poorly suited for industrial production. They remain predominantly reserved for plumbers as a work item, result in high labor costs and in their function are difficult to seal against each other and have less favorable flow characteristics.

Furthermore, a machine is known, which makes it possible to produce längszufalzte Blechhaibschaien that are most likely manually, to auger elbows completeness in unspecified manner. This machine has ITachteil, dais the important cylindrical connecting piece on the half-shells are not to start with.

It is also urgent that without undisguised additional means, a positive connection of the two half-shells is not possible, because the rectified folds on the sides of the half-shells are directed radially towards or for the opposite half-shell from the center of curvature.

Object of the invention

The invention is to enable a low-cost industrial production of thin-walled elbow with little human effort, which are optimally fluid in their application and enable tight connections in the connection piece.

Explanation of the essence of the invention

The invention is based on the object of thin-walled sheet dense, smooth, enamelling and fluidically optimally designed pipe bend with cylindrical connecting piece with reduced production costs and without application of thermal joining methods, such as welding,. Solder in the curvature herzustell

According to the invention, the pipe bend of two provided with elongated approaches for the connection piece, smooth in the flow direction sheet metal half shells formed, wherein the side walls of a sheet metal half shell in the region of the pipe bend slightly beyond the pipe center at right angles to the pipe interior molded to splashing and also projecting beyond the pipe center walls of the Approaches of the connecting pieces, one of which is tapered in diameter, set back by the amount of wall thickness to the tube center, and a counter-lying second half sheet metal shell whose side walls in the region of the curvature in front of the tube center to the inside of the tube projecting, outwardly open double flanges and smooth are provided in front of the pipe center end of the pipe contour corresponding approaches the connecting piece, so that when joining the Ble.chhalbschalen the flanges in the double flanges,

rolled tangential, and are crimped against an outwardly attacking contour surface such that both Palze adhering centrally to the curvature comply with the circular contour on the outer surface, and the approaches of the connecting piece superimposed on the circular. To ensure circumference, so that the outer Hahte without difficulty by surface treatment, such as enamelling, painting, galvanizing o.a. largely gone.

The technical solution of the pipe elbow with connecting pieces fulfills the objects of the invention by the contours of the manifold half shells formed from thin sheet metal and thus are smooth in the flow direction and fluidically optimal. The special arrangement of the seam seams in the flow direction allows a flow, not hindering, dense and advantageous for enamelling execution.

The special arrangement and implementation of the fold allows the industrial production of elbows with extensive mechanization and rationalization of the work process.

embodiment

The invention is explained in detail with reference to the drawing, in which:

Pig. 1: sheet metal half-shell 1 in plan view to the tube interior

Pig. 2: Extract of the section of the approaches of the connecting piece of the sheet metal half-shell 4, not shown

Pig. 3: Section of the side wall of the not shown "sheet half-shell 4 with double flange

Pig. 4: section A-A

Pig. 5: Cut B-B

Pig. 6: Section of the section of the PaIz-joined elbow in the region of the fold.

Pig. 7: section of the section of the Aussauchnutzen formed by covering

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The pipe elbow with cylindrical connecting piece is formed from two preformed sheet metal half shells 1.4 with chute 6, 7 and double flange 10 having on one side to a Krümmeraußendurchmesser semi-cylindrical neck 3 and on the other hand by a double wall thickness s tapered approach 2, the dense Ensure plug connection between other elbows or straight steel pipes ·

For the purpose of the seal is omitted in the area of the connecting piece on a Palzausbildung and the superimposition of the side walls 11,12 regarded as sufficiently tight, especially as a surface treatment, such as enamelling, painting, galvanizing u.a. follows.

The joining of the sheet half-shells 1, 4 takes place by inserting the 'splitter 6.7 in the double flanges 10 and' their repositioning and applying with passing through the PaIz 13 such that the contour of the Krümmeraußendurchmessers passes undisturbed except for the achieved due to the penetration of minimal Palznaht 13, which passes through the subsequent surface treatment.

Claims (1)

invention claim Pipe elbow made of folded, preformed two sheet metal half-shells with cylindrical connecting piece, characterized in that a provided with lugs (2,3) for the formation of the connecting piece sheet half-shell (1) in the region of the pipe curvature on both side walls above the pipe center (5), at right angles directed to the tube interior, churn (6,7) flanged, and the side walls (11) of the diameter-tapered neck (2), as well as the neck (3) to the found thickness (s) are set back, and a manifold complementary to the sheet metal half-shell (4) ,. whose Seiten'enwandungen (9) in the region of the curvature in front of the tube center (5) with 'one in the tube interior projecting, outwardly open double flange (10), and on both sides with only the connecting piece outer contour correspondingly shaped, before the tube center (5) ending Side walls (12) are provided, so that when plucked from the sheet metal shells (1,4) pipe bend the splashing (6,7) in the double flanges (10) to! Folds (13) added, against an outer contiguous contour surface to the tube center (5 ) folded and rolled, and the approaches (2,3,12) are arranged overlapping » For this 1 page drawings