Injector with holder for an air mixer or the like

Abstract

An injector with a holder for detachably disposing the injector in the bottom of the vessel of an apparatus for blowing a gas from below into said vessel, said injector consisting of an injector tube and an injector casing situated at some distance about the injector tube, the adjoining portion of the injector casing and the holder respectively, having identical conically slanting surfaces one contacting the other at least at one location.

Description

BACKGROUND OF THE INVENTION

The invention relates to an injector with a holder for detachably disposing the injector in the bottom of the vessel of an apparatus; the material to be treated is introduced into the vessel and fluidified by blowing a gas, e.g., air, from below into the vessel, the injector substantially consisting if an injector tube and an injector casing situated at some distance about the injector tube, the casing at its upper end having a closure provided with an opening, corresponding to the outlet of the injector tube situated under said opening.

Such injectors are known in the art. One of the important features of this construction has to be appreciated therein that it should be easily to fit and to detach the injector, the detachability should not impair the fluidification of the matter to be treated.

SUMMARY OF THE INVENTION

The invention aims to provide an injector with holder of a kind satisfying almost ideally the aforementioned conditions. This is achieved such that the end part of the wall of the casing turned away from the closure, is outwardly thickened and -- generally speaking -- the face of the thicker wall part turned towards the closure has a conically extending slant, while in the thicker wall part one or more transverse channels are provided each of them connecting the outer peripheral surface of the injector casing with the space between injector tube and injector casing, while the hollow holder further consists of a circumferential wall and on one side a transverse wall in which is provided a central opening having a cross-section inferior to the cross-section of the hollow room in the holder, the edge of the transverse wall surrounding said central opening and turned towards said hollow room showing a conically extending slant so that after fitting the injector in the holder the conically extending faces of the injector casing and of the transverse wall of the holder, respectively, contact each other at least at one location.

Preferably the thicker wall part of the injector casing limited by the channels arranged in said wall part on one side and on the other side its free lower edge has an outwardly protruding flange, whereas the circumferential wall of the holder has an inwardly directed flange underneath the channels in said wall so that after fitting the injector into the holder, the two flanges together with a sealing disposed thereinbetween contact each other forming a gas-tight closure for a portion of the hollow room in the holder, all channels in the injector casing communicating with said portion of the hollow room.

According to the invention the hollow holder forms a portion of a circumferential channel-shaped elevated part of the bottom of the vessel of the apparatus so that the closed portion of the hollow room in the holder forms a portion of said circumferential channel in the elevated part of the bottom of the vessel.

The invention further aims to provide in the circumferential wall of the holder a plurality of channels corresponding to the number of channels in the thicker wall part of the injector casing each of said channels in the holder corresponding to an aligned channel in the injector casing, whereas each channel in the circumferential wall of the holder the end of a feed tube is secured gastightly.

SURVEY OF THE DRAWINGS

FIGS. 1 and 2 show respectively, a longitudinal axial section of two different embodiments of the injector together with its holder according to the invention.

DESCRIPTION OF PREFERRED EMBODIMENTS

First of all for simplicity's sake the closing bottom 1 and the porous intermediate bottom 2 of the vessel of the apparatus in which the injector should be detachably fitted are shown only partly.

A gas, for instance air, is introduced under pressure into the room enclosed by the lateral wall of the vessel (not shown), the closing bottom 1 and the porous intermediate bottom 2, whereafter said gas is blown through the porous bottom into the room inside the vessel above said porous bottom where it fluidifies the matter to be treated.

In an opening of the bottom 1 is arranged a holder 3 which by means of a protruding marginal part 4 of its circumferential wall 5 bears on the bottom 1 the connection of said marginal part 4 to said bottom 1 being airtight. The holder 3 is open on its underside and closed at its top side by means of a transverse wall 6 provided with a central opening 7, having a cross-section smaller than the cross-section of the hollow room in the holder 3. The edge of the transverse wall 6 encircling the central opening 7 has a conical bevelled edge 8 turned to the hollow room. The circumferential wall 5 has an inwardly directed flange 9. The circumferential wall 5 is at its inside under the flange 9 provided with a screw thread 10.

The injector 11 comprises an injector tube 12 and, at some distance about the tube, an injector casing 13 provided at its top with a detachable closure 14 screwed on the casing and showing a central opening 15. The end portion 16 of the injector casing 13 turned away from the closure 14 is thickened outwards forming a conical bevelled part 17 shaped so that said part 17 corresponds to the conical bevelled part 8 of the holder 3. The end portion 16 of the injector casing 13 is provided at a portion of its inside with a screw thread 18, whereas the thinner lower portion 19 of the thickened part 16 is provided with a screw thread 20.

The injector tube 12 has a thicker foot 21 provided at its outside with a screw thread corresponding to the screw thread 18. Therefor the injector tube 12 can be screwed into the injector casing 13, the height of the injector tube 12 adjustable in respect of the injector casing 13 and consequently also the distance of the mouth 22 of the injector tube 12 underneath the closure 14 is adjustable in respect of the opening 15 in the closure 14. The adjusted position can be ultimately secured by means of an adjusting screw 23 arranged in the injector casing 13.

The injector 11 can be introduced slidably into the holder 3 until the conically extending slants 8 and 17 adjoin each other, whereupon the injector 11 is secured in said position by means of an adjusting ring 24 which has an outside screw thread that corresponds to the screw thread 10 inside the holder 3. A sealing 25 is clamped between the flange 9 of the holder 3 and an outwardly directed flange 26 of the end portion 16 of the injector casing 13. Thus a room 27 is formed within the holder 3 closed gastightly except for the transverse channels 28 and 28a, respectively, arranged in the thicker part 16 of the injector casing 13, said channels 28 and 28a connecting the room 27 to the room 29 between the injector tube 12 and the injector casing 13. Furthermore feed tubes 30 and 30a, respectively, secured in a gastight manner in the circumferential wall 5 of the holder 3 and provided at their outward ends with a screw thread 31 and 31a respectively, debouch into the room 27.

The feed tubes 30 and 30a, respectively, are connected to supply tubes (not shown) for supplying a gas for instance air under pressure.

A nipple 32 screwed into the lower portion of the wall part 16 of the injector casing 13 is provided at one end with an outer screw thread corresponding to the screw thread 20 of the wall part 16 and at the opposed end with outside screw thread 33 for connecting a piping (not shown) for feeding a material which has to be blown in a finely distributed condition into the vessel of this apparatus.

In a second embodiment of the apparatus (see FIG. 2) more injectors 11 one from the other in spaced relationship are arranged in an annular elevated part 34 of the bottom 1 of the vessel, said elevated part 34 extending about the vertical axis of the vessel and corresponding to an annular wall 35 arranged at the underside of the bottom 1. Thus, the room 36 inside the elevated part 34 forms a channel extending about the vertical axis of the vessel, and closed gastightly by means of sealings 37 each of them clamped between a part of the bottom 1, protruding into the room inside the elevated part 34 and the flange 26 of each injector 11 with the exception of the transverse channels 28 and 28a, respectively, debouching into the room 36. Further each injector 11 is shaped as already described hereinbefore with the exception that in this embodiment the closure is secured fixedly to the injector tube.

Apart from the fact that in both embodiments the injectors 11 can easily be mounted and detached it is extremely advantageous that the slants 8 and 17 need not to adjoin each other gastightly. The gas supplied through the feed tubes 30 and 30a respectively, or as the case may be via the room 35, for instance compressed air, may leak away into the room under the porous bottom 2, because said gas is introduced already into said room for fluidizing the material to be treated. The pressure of the gas supplied for atomising the material supplied through the injector tube, exceeds the pressure of the gas for fluidizing the material in the vessel so that a leakage in opposite direction is not possible.

The faces 8 and 17 need not be flat-conical. In particular cases it may even be advantageous to construct the face 8 and/or the face 17 slightly spherical.

Claims

What we claim is:

1. Injector with a holder for detachably disposing the injector in the bottom of a vessel receiving material to be treated by being introduced into the vessel and fluidified by blowing a gas from below into said vessel, the injector comprising an injector tube and an injector casing situated at some distance about the injector tube, said casing having at its upper end a closure with an opening corresponding to the outlet of said injector tube situated under said opening, the end portion of the wall of said casing turned away from the closure being outwardly thickened, the face of the thicker wall part turned towards the closure having a conically extending slant, the thicker wall part having at least one transverse channel connecting the outer peripheral surface of the injector casing with the space between injector tube and injector casing, said holder being hollow and comprising further a circumferential wall and on one side a transverse wall with a central opening having a cross-section smaller than the cross-section of the hollow space in the holder, the edge of the transverse wall encircling said central opening and turned towards said hollow space having a conically extending slant so that after fitting the injector in the holder the conically extending faces of the injector casing and of the transverse wall of the holder, respectively, contacting each other at least at one location.

2. Injector with a holder as claim 1, wherein the thicker wall part of said injector casing is limited between the channels arranged in said wall part on one side, on the other side the free lower edge of said wall part has an outwardly protruding flange, the circumferential wall of said holder having inwardly directed flange underneath the channels in said wall so that, after fitting the injector into the holder the two flanges together with a sealing disposed thereinbetween contact each other forming a gastight closure for a portion of the hollow space in the holder, all channels in the injector casing communicating with said portion of said hollow space.

3. Injector as claim 2, wherein said hollow holder forms a portion of a circular channel-shaped elevated part of the bottom of said vessel, the gastight closed portion of said hollow space in the holder forming a portion of said circumferential channel in the elevated part of the bottom of the vessel.

4. Injector with a holder as claim 1, including a plurality of channels in the circumferential wall of said holder and corresponding to the number of channels in said thicker wall part of said injector casing, each of said channels in said holder corresponding to a channel in said injector casing and in alignment with the first-mentioned channel.