FR2529654A1 - VENTILATED CASE - Google Patents

Abstract

THE INSULATED CHAMBER INCLUDES A SINGLE-PIECE 19 INTERNAL WALL WITH 22 ROUNDED ANGLES. THE LOWER SURFACE OF WALL 19 HAS SIDE PORTIONS 24 INCLINED TOWARDS CENTRAL ZONE 23. PERFORATED DISTRIBUTION SCREENS 29 ARE PROVIDED INSIDE THE BEDROOM. SUCTION AND RECOVERY OF THE TREATMENT FLUID ARE DONE THROUGH TWO UPPER TUBING 8 AND 9 AFTER THE FLUID PASSED THROUGH FILTERS 39 ARRANGED AT AN INCLINE. A LIQUID SPRAYING CLEANING DEVICE 26, 27 IS ALSO FITTED INSIDE THE CHAMBER, THE CLEANING LIQUID CAN BE DRAINED THROUGH ORIFICE 25. IT IS THUS POSSIBLE TO REMOVE THE SCREENS AFTER EACH TREATMENT CYCLE. 29 AND FILTERS 39 THEN TO AUTOMATIC CLEANING BY SPRAYING LIQUID INSIDE THE OVEN THE OVEN CAN BE USED IN THE PHARMACEUTICAL INDUSTRY.

Description

The present invention relates to a ventilated oven allowing

  to treat products in a flow of a gaseous fluid maintained at a predetermined temperature

  ovens of this type can be used in a large number of

  eg for the drying and baking of varnishes or resins, the curing of rubber and plastic coatings, the heat treatment of metal parts, the drying of vials or ampoules of products

pharmaceutical, etc. -

  Ventilated ovens are already known which generally comprise a heat insulated chamber inside which the products to be treated can be introduced, for example carried by trolleys. The treatment gas treatment group is generally arranged directly on the outside. above the insulated chamber, the supply of treatment fluid being through distribution mouths arranged over the entire height of the side walls of the oven A regulation assembly makes it possible to control the

  air flow or process fluid and its temperature.

  depending on the needs of the treatment.

  The known ovens of this type have the disadvantage of not being able to be easily adapted to particular treatments which require a frequent thorough cleaning of the inside of the insulated chamber.

  particular for applications in the pharmaceutical industry.

  for which the present invention is

highly adapted.

  The present invention therefore relates to the production of a ventilated oven whose structure allows easy cleaning. The ventilated oven according to the invention comprises a heat-insulated chamber inside which the products to be treated can be introduced. The oven further comprises ventilation means capable of establishing in said chamber a flow of gas or air. of treatment maintained at a temperature

  The insulated chamber of the oven according to the invention

  it comprises a one-piece wall whose angles are rounded and whose lower surface has lateral portions

  inclined towards the central zone The heat-insulated

  also takes support means for perforated screens

  distribution of the flow of the treatment fluid passing through

  In the chamber and two pipes allowing the supply and the recovery of the treatment fluid, these two pipes being in connection with the ventilation means A liquid-cleaning device 1o is also mounted inside the chamber. insulation whose lower wall comprises, in its central zone, means for evacuating the

cleaning liquid.

  Filtration devices providing pre-filtering are additionally preferably removably mounted on support means integral with the inner walls of the chamber.

calorifugée-

  Thanks to the whole of this arrangement, it is possible to easily proceed to the cleaning of the inside of the insulated chamber after removing the distribution screens as well as optionally the prefiltering devices, all

  these elements being preferably fixed by means permitting

  rapid disassembly The projection of the liquid from

  cleaning directly inside the insulated room

  allows the easy cleaning of the room thanks to the configu-

  rounded corners and the one-piece structure of the inner wall while facilitating direct evacuation after

  cleaning by the lower wall of the chamber.

  The ventilation means co-operating with the insulated chamber preferably comprise a fan, a filtration device, a heating battery and

  dosing registers of the flow of treatment fluid

  seems to be mounted outside the insulated chamber and connected to the tubing of the latter by piping of

link.

  In a preferred arrangement, the tubings are

  placed in the vicinity of the upper part of the insulated chamber, in the corners thereof and the pre-filtering devices comprise a frame receiving a filter and mounted inclined in the angle in question The fixing frames is made so as to be able to quickly remove the filter device For this purpose, the frames are fixed in profiles integral with the upper angle of the insulated chamber with clamping by a removable frame fixed by quarter-turn screws. The distribution screens are arranged over the entire width and the entire height of the oven, separating it from

  a central portion intended to receive the products to be processed

  ter and two side portions comprising in their upper part the filtering devices and the mouths of the tubes In this way, the flow of the gaseous treatment fluid from the feed pipe passes through

  first of all the pre-filtering device before being

  It is the same for the recovery of the treatment fluid on the opposite side of the insulated chamber via the other prefilter.

and the recovery tubing.

  To facilitate disassembly and extraction of the distribution screens before the liquid spray cleaning, the distribution screens are preferably each constituted by at least two elements assembled for example by quarter-turn screws or any other quick-fastening means. The distribution screens are preferably supported on the edges of the inner wall of the insulated chamber, their lower edge being held on nipples fixed to the bottom of said chamber Their upper edge is fixed, preferably by quarter-turn screws , on the fastening profiles of the

pre-filtering devices.

  The invention will be better understood when studying the description of

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS OF THE INVENTION, FIG. 1 is a diagrammatic elevational view of a ventilated oven according to the invention also showing the ventilation means; Figure 2 is an elevational sectional view of the insulated chamber; Figure 3 is a top view in section of the same heat insulated chamber; and FIG. 4 is a detailed view showing the means of

  removable attachment of prefilters.

  In the embodiment illustrated in the figures,

  the invention is applied by way of example to an oven

  specially adapted for use in the indus-

  pharmaceutical processing, the product treatment

  can be easily cleaned after each treatment cycle

  by rapid disassembly of the distribution screens of the treatment fluid which is here air and internal filters, followed by cleaning by injection of water or water vapor

  possibly containing detergent products.

  As can be seen in particular in fig 1, the oven

  includes an insulated chamber with two access doors

  2 also insulated heat referenced 2 also visible in Figure 3 comprising a single leaf mounted on hinges 3 and closed by an inner espagnolette actuated by an outer handle 4 and an inner safety handle 5 The seal is provided by flexible joints 6 visible in fig 3 A glazed port 7 is also provided

at the level of the handles 4.

  In the upper part of bedroom 1 is arranged

  a feed pipe 8 and a return pipe 9.

  The two pipes 8, 9 are connected to the air preparation unit 10 by connecting pipes 11, the whole of the group 10 being disposed substantially above the insulated chamber 1, separated therefrom and, at upper floor of which

  we can see the floor 12 in fig 1 The preparatory group

  air intake 10 comprises a centrifugal fan 13 which draws ambient air through a pipe 14 provided with a manually controlled dosing rea-zre comprising upstream a filter Il. The air sucked by the fan 13 is fed to a filter box 16 which precedes a heating coil 17.

  air flow can be regulated by means of

  cuation 18 having a manual control dosing register.

  It is therefore seen that the ambient air sucked through the fan 13 and suitably filtered by the filters 15 and 16 is maintained at the temperature required by the heating battery 17 and enters the insulated chamber 1 by the

  feed pipe 8 before being taken back through

  of the recovery tubing 9 connected by the channeling

  connection 11 to the fan 13.

  The oven is completed by control and regulation means which have not been shown in the figures and which automatically control the operation of

treatment according to the desired cycle.

  Referring to FIGS. 2 and 3, it can be seen that the chamber 1 comprises a single-piece inner wall 19 and an outer wall 20

  between which there is a heat-insulating material 21.

  The angles 22 of the inner wall 19 are rounded The surface

  lower part of the inner wall 19 has a central portion

  horizontal tread 23 and two lateral portions 24 inclined

  towards the central portion 23 and connecting with this last

  A central hole 25 is formed in the central portion 23 and allows the evacuation of the

cleaning liquid.

  A line 26 for supplying the cleaning liquid enters through the upper part of the insulated chamber 1

  and extends to the vicinity of the center of said chamber.

  The end of the pipe 26 comprises a projection head

  Such a conventional type projection head comprises, for example, an outer sphere provided with perforations 28 and an internal spherical device driven by

  rotation by the pressure of the liquid This projection device

  The invention, which can be fed with cleaning liquid, for example by means of an ejector-mixer, not shown in the figures, makes it possible to force the cleaning liquid on the entire surface of the inner wall 19, the liquid being then taken up by the extraction orifice 25 located at the bottom part. Two perforated distribution screens referenced 29 in

  together they are mounted inside the heat chamber.

  1 Each distribution screen 29 is arranged over the entire width and the entire height of the chamber 1 as can be seen in FIGS. 2 and 3. These screens 29 thus define

  in room 1 a central processing area corresponding to

  lies at the central portion 23 of the lower surface and two lateral zones that correspond to the inclined lateral portions 24 of the lower surface In the example shown, each of the distribution screens 29 comprises two elements 30 and 31 each occupying half the width of the chamber 1 and fixed together by quarter turn nut screw assemblies 32 or other similar fastening means which allow rapid disassembly Handles 33 facilitate the extraction of the various elements 30 and 31 The lower edges of the perforated screens 29 come s The protruding flanges 34 are located at the junction between the inclined lateral portions 24 and the horizontal central portion 23 of the lower surface of the chamber 1. The position of the screens 29 is obtained by cooperation between the perforated tabs 35. secured to the screens 29 and curved at 90 with pins protruding 36 integral with the lower surface horizontal 23 of the chamber 1 At their upper edge, the screens 29 are fixed by screw nut quarter turn assemblies 37 on an upper portion of a profile 38 obtained for example by deformation of the inner wall 19 or by a

  additional piece welded to said inner wall.

  On their outer vertical edges, the two elements 30 and 31 have bent tabs 35a visible in FIG. 3 which bear on protuberances or flanges 19a of the inner wall 19, these protuberances 19a delimiting the two openings side of bedroom 1

closed by doors 2 and 3.

  Filters 39 providing pre-filtering of the treatment air

  are removably secured in the upper corners of the integral inner wall 19 so as to be in the

  treatment air path between the enclosure and the tubu-

  lures 8 and 9 occupying the entire width of the inner wall

19 of room 1.

  As can be seen in FIG. 4, the filters 39 are fixed so that they can be rapidly removed by clamping a removable frame 40 by means of rapid tightening systems of the quarter-turn nut screw type 41 or other fastening means. Each screw 41 cooperates with a receptacle 42 whose sealing is provided by a cover 43 welded to the profile 38 A seal 44 cooperating with the periphery of the

filter 39 completes this arrangement.

  Horizontal rails 45 are mounted on the central portion 23 by means of studs 46 at which the structure is reinforced by U-shaped sections 47 embedded in the

insulation 21.

  The products to be treated can therefore be easily introduced

  inside the oven on represented trolleys

  schematically in phantom lines in figs 2 and 3 and

  48 during the treatment operation, the hot air or steam or any other treatment fluid driven by the fan 13 enters through the tubing 8, passes through the first prefilter 39 and is distributed by the first screen 29 over the entire height and width of the enclosure, then comes into contact with the products to be treated and is taken by the tublulure 9 after passing through the second splitter screen 29 and the second

prefilter 39.

  After a treatment cycle, the trolleys 48 carrying the treated products can be extracted from the oven by the other door, the rails extending over the width of the oven of a

  door to the other Then we dismount the two screens distributed

  29 and the two prefilters 39, this operation is done quickly thanks to the different quarter-turn screw-nut systems. The internal wall 19 is then cleaned by spraying with water or a suitable liquid, possibly supplemented with a detergent, via the cleaning head 27 Cleaning liquid flowing on the edges

  inclined 24 is taken up by the extraction orifice 25.

Claims (7)

  Ventilated oven comprising an insulated chamber (1) inside which can be introduced products to be treated and ventilation means (10) capable of establishing in said chamber a flow of treatment fluid maintained at a predetermined temperature, characterized in that the insulated chamber (1) comprises: a one-piece inner wall (19) whose rounded corners (22) and whose lower surface has lateral portions (24) inclined towards a central portion (23), support means (36, 19 a) for perforated screens (29) for distributing the flow of the treatment fluid passing through the chamber (1) and two tubes (8, 9) for feeding and recovering the treatment fluid in connection with the ventilation means (10); and a liquid spray cleaning device (27) mounted inside the chamber, the cleaning liquid being discharged through said central portion, 2 Ventilated oven according to claim 1, characterized   in that each tubing (8, 9) cooperates with   filtering device (39) removably mounted on a means   support (38) inside the chamber (1).   Ventilated oven according to claim 1 or 2, characterized   characterized in that the cleaning device comprises a pipe (26) supplying pressurized liquid entering the chamber (1) and provided at its end with a rotating projection head (27).   Ventilated oven according to any one of the claims   tions, characterized by the fact that the means of   ventilation (10) comprise a fan (13), a device   filter (16), a heating battery (17) and dosing registers of the treatment fluid flow, the assembly being mounted outside the chamber (1) and connected to the   aforementioned pipes by connecting pipes (11).   Ventilated oven according to any one of Claims 2 to 4, characterized in that the tubes (8, 9) are arranged in the vicinity of the upper part of the chamber (1) in the corners thereof, each device   filtering being mounted inclined in the angle considered.   Ventilated oven according to any one of the claims   2 to 5, characterized by the fact that   (29) are arranged over the entire width and height of the separating oven, the latter in a central portion for receiving the products to be treated and two portions   side sections comprising in their upper part the   filter elements (39) and the mouths of the tubes (8, 9).   7 ventilated oven according to claim 6, characterized in that the distribution screens are each constituted by at least two elements (30, 31) assembled, which can be quickly dismantled.   Ventilated oven according to claim 6 or 7, characterized   characterized in that the distribution screens are supported on the edges (19 a) of the inner wall, their lower edge being held on pins (36) fixed to the bottom of the the insulated room.   Ventilated oven according to any one of the claims   2 to 8, characterized in that each filtering device is fixed so that it can be quickly disassembled in a profile (38) integral with an upper angle of the chamber with clamping by a removable frame (40) fixed by quarter turn screw.   Ventilated oven according to Claim 9, characterized in that the above-mentioned sections (38) also serve as a support for fixing the upper edges of the screens of   distributions (29) by means of quarter turn screws.