EP0046756B1

EP0046756B1 - A nozzle

Info

Publication number: EP0046756B1
Application number: EP80902250A
Authority: EP
Inventors: Ingemar STRÖM
Original assignee: NORDISKA EGOUTTEURFABRIKEN AB
Current assignee: NORDISKA EGOUTTEURFABRIKEN AB
Priority date: 1979-11-22
Filing date: 1980-11-21
Publication date: 1985-04-17
Also published as: DE3070529D1; SE433451B; FI71887C; WO1981001374A1; FI814078L; SE433451C; FI71887B; EP0046756A1; JPS56501635A; SE7909683L; JPS648577B2

Abstract

A nozzle for tubes (8) which are provided with at least one through opening in the tube wall and which are intended to carry a fluid to be ejected through the nozzle. The nozzle includes a flat strip (1); at least one jet member (3) which includes a substantially cone-shaped indentation (4) in the strip, and a grove (6) which extends around the edge of the base of the indentation and is open towards the apex of the indentation and which is intended to receive a gasket (7), an outlet orifice (5) at the apex of the indentation; and a clamping device (2) for clamping the strip around the tube with the indentation extending into the opening of the tube and with the packing as a fluid-tight seal between the cone and the tube wall. The strip may be provided with a number of jet members (3). The groove consists of a bulge in the strip.

Description

The present invention refers generally to nozzles and, more particularly to nozzles of the kind which are intended to be fixed to tubes which carry a pressurized fluid to be sprayed through the nozzle, as specified in the first part of Claim 1.
Nozzles of this kind are known and include, in addition to a jet member, a holder for fastening the jet member in openings which are made in the wall surface of the tube. The disadvantage of these prior devices is that for each nozzle two components must be mounted, viz. first the holder in the wall opening and then the jet member in the holder.
A prior art nozzle comprising a separate nozzle plate and a separate strip type clamping device for clamping the nozzle plate to a tube member is known from DE-A-2 709 920. In relation to that known device the nozzle in accordance with the present invention differs in that the latter comprises a nozzle device which is integral with the strip of the strip type clamping device. The nozzle in accordance with the present invention is therefore easy to locate and clamp in a through opening provided in the tube wall since once it has been placed in a through opening the strip type clamping device is tightened thereby finishing the mounting of the nozzle. The known nozzle plate, however, must at first be placed over a through opening, then it must be held in position there while the clamping device is slipped over the nozzle plate. Finally the clamping device is progressively tightened while observing and, if need be, adjusting the nozzle plate in its proper position over the through opening. Moreover, the nozzle of the present invention comprises a gasket which seats directly between the strip and the outer tube wall.
The present invention aims at eliminating this disadvantage and providing a nozzle where the holder and the jet member are constructed as an integral unit which is easy to mount on the fluid-carrying tube.
The characteristic features of the invention will be seen from the attached drawings in which:

Figure 1 is a perspective view of the nozzle according to the invention,
Figure 2 is a side view of the nozzle according to Figure 1 mounted on a fluid-carrying tube,
Figure 3 is a cross-section of a jet member,
Figure 4 is a cross-section along the line IV-IV in Figure 2, and
Figure 5 is a front view of a tool suitable for the cleaning of a nozzle according to the invention.

The nozzle according to the invention includes a flat strip 1 which is bent into cylinder shape. By means of a clamping device 2 the diameter of the strip or ring may be changed. In the wall surface of the strip there is provided a jet member 3 which includes a substantially conical indentation 4, an outlet orifice 5 made in the apex of the indentation and a bulge 6, hereinafter called a groove, surrounding the indentation for receiving a gasket 7 shown in Figure 3.
The nozzle according to the invention is intended to be fixed to a tube 8 shown in Figure 2 and having a through opening 9 in its wall surface. The tube carries a pressurized fluid which is to be sprayed through the nozzle. The indentation 4 is placed in the opening 9. Before the clamping device 2 is tightened, the gasket 7 is placed in the groove 6. At the tightening of the clamping device a fluid-tight joint is formed between the indentation and the outer wall of the tube 8.
In Figure 3 the strip 1 is shown at an enlarged scale before the bending thereof into a circular form. The substantially conical indentation 4, the base surface of which is circular, is surrounded by the annular groove 6 in which the gasket 7, for example an O-ring, is to be housed. By the expression substantially conical also three-dimensional bodies other than cones are intended to be covered, for example semispheres, pyramid shapes or other wart-like shapes. The groove 6 need not connect directly to the edge of the base surface of the indentation but may be spaced from the edge. The outlet opening 5 may be bored, milled or made in some other way in the apex of the indentation. The form of the outlet opening 5 is adapted to the desired type of stream from the nozzle. If a so-called jet stream (needle stream) is desired, a circular hole is bored in the apex of the indentation; if a flat stream is desired an elongated hole is milled. The strip 1 is preferably made from sheet steel, but also other materials, such as for example aluminium, brass etc. are possible.
Figure 4 shows the clamping device 2 which includes a screw 10 extending between embossed, smoothly upset portions 11 at either end of the strip. A nut 12 is screwed on to the free end of the screw. After tightening the nozzle on the tube 8 the exposed thread of the screw is deformed to avoid unscrewing the nut unintentionally, for example by vibrations.
An important feature of the invention is that the apex of the identation 4 has to extend through the opening 9 some distance out or up over the interior wall surface of the tube 8. Thereby the outlet opening 5 can be cleaned in a simple way by means of a brush, for example the brush shown in Figure 5 which includes a tube 13 in the wall surface of which two rows of axially extending, radially projecting bristles are disposed diametrically opposite each other.
According to the invention the strip 1 may be provided with more than one jet member 3.
The nozzle may be used, for example, in so-called spray pipes in paper and cellulose manufacturing machines.

Claims

1. A nozzle (3) for spray pipes of the kind comprising a tube (8) which has at least one through opening (9) in the tube wall and which is intended to carry a fluid to be ejected through the nozzle, comprising a flat circular strip (1) carrying at least one cone shaped nozzle (3) in the form of an indentation the apex of which extends above the interior wall of the tube (8) in a radial direction inwardly and is provided with an outlet orifice (5) and a clamping device (2) for clamping the strip around the tube with the indentation positioned within said through opening (9), characterized in that said indentation and a groove (6) surrounding said indentation are formed integral with said strip extending around the tube (8).

2. A nozzle in accordance with Claim 1, characterized in that the groove (6) forms a continuation of the lower edge of the cone shaped indentation or, optionally, is spaced therefrom.