FR2505997A1 - DRYER - Google Patents

Abstract

THE DRUM DRYER INCLUDES A DOOR 6 MOUNTED IN A PREVIOUS WALL 2 OF THE DRYER BODY, THE SAID DOOR INCLUDING A CIRCULAR CHICANE IN MOLDED MATERIAL 12 AS WELL AS A DOOR FRAME IN MOLDED MATERIAL 32. THE CHICOND 12 CONSISTS OF A FAST 12. A CHICANE 13 PARTITION WHICH PARTLY CLOSES AN OPENING 11 DEFINED BY A FLANGE 14 IN A TERMINAL WALL OF THE DRUM 3 CAPABLE OF ROTATING AROUND ITS AXIS 5. THE EXISTING SLOT BETWEEN THE CHICANE 13 PARTITION AND THE FLANGE 14 CONTAINS A RING OF PERFORATED PROTECTION 15. AN AIR-TIGHT SEAL BETWEEN THE CHICANE 12 AND THE FRONT WALL 2 OF THE BODYWORK IS SHAPED BY AN ELASTIC BAND 29 INSERTED IN A THROAT 28 IN THE CHICANE 12.

Description

"Drum dryer" The invention relates to a drum dryer

  comprising a body containing a drying drum

  able to turn around a horizontal axis, a body door serving to close in an airtight manner an opening made in the body, a central circular opening which is made in a

  drum end adjacent to the carriage opening

  and which, with respect to said opening of the body, is made so as to allow the introduction of objects

  to dry in the drum and the exit of these objects

  when the door is open, while this door

  has at least one circular baffle in the shape of a

  vette which is coaxial with said horizontal axis and which, towards the inside of the bodywork, extends so that the

  bottom of the bowl-shaped chicane forms a wall

  its partially closing off said circular opening during

  that the door is in the closed position, while the annular gap which remains between the baffle wall and the edge of the circular opening is occupied by a protective ring integral with the baffle wall and which must prevent objects from entering the slot, said protective ring being provided with perforations which allow the passage of air fairly freely by

slot.

  In such a tumble dryer, air is introduced into the body and heated, after which this air passes through the drum to dry the articles it contains in this way, passing through the perforations in the protective ring. to then arrive in an annular guide surrounding the circular baffle and be finally extracted from the machine Air circulation

  in the drum is ensured by a fin wheel

  dragged by a motor Because the circulating air

  does not enter the atmosphere through the door, it is essential

  think of having an airtight seal between the

door and bodywork.

  A tumble dryer of the type described below

  above is mentioned in the British patent no 1,434,607 According to the embodiment described in said British document, the door is provided with an elastic band ensuring air tightness and designed so as to be in contact with the flat outer face of the bodywork around the door opening and at a short distance from the edge thereof The door frame is hollow, and the circular cup-shaped baffle is provided with a cheek which extends into the hollow of the frame door and which in this place is fixed by the sealing strip This therefore has a double function, namely to keep in place the circular baffle in

  the door frame, and ensure air tightness in-

  be the door and the bodywork However, the need to provide a hollow door frame generally leads

  and inevitably when it is made of Gold sheet, the

  sheet metal tendencies tend to give rise to charges

  relatively high, for example because these

  tructions must be protected against corrosion by humidity-laden air, and furthermore the shaping of

  these constructiox and the color they receive must

  wind ensure their pleasant aesthetic General-

  reasonable protection against corrosion is obtained if the metal is enamelled in the oven However, chips or scratches appear easily

  in said enamel layer In addition, it is very diffi-

  Cile to develop a protective enamel coating on the inside

  of hollow parts In addition, the alignment of the

  dre of door, circular baffle and sealing strip is rather a difficult operation whose automation is not easy The result is that

  assembly is time consuming and expensive.

  However, an object of the present invention is to provide a tumble dryer which belongs to the type

  described above and in which the construction of the

  drerk, door, circular baffle and strip

  sealing has been significantly simplified.

  The dryer drum according to the invention

  tion and of the type above has the particularity that in the vicinity of the opening made in the bodywork, the wall of the circular baffle is provided with an annular groove in which there is an elastic band of airtightness placed so that the door being

  closed, said strip provides direct air tightness

  between the circular baffle and the body.

  Consequently, in a dryer drum according to the invention, the airtightness strip

  is held in place only by the circular baffle

  same area, etd c the strip should not be located and

  held in place by the door frame.

  In addition, the air sealing strip

  can be attached to the circular baffle at any time

  conch of the assembly of the tumble dryer, since the use of the sealing strip no longer depends on the presence of the door frame Consequently, the circular baffle can be kept in stock being already provided with

the sealing strip.

  In addition, the door frame no longer needs to be drawn to hold the flexible strip either to the frame or to the circular baffle in a sealed manner.

  in the air, since the strip establishes a watertight seal

  in the air directly between the chicane and the car-

  bodywork Indeed, it is possible to provide on the

  baffle a cheek whose diameter is larger than this

  him from the opening of the bodywork, and shaping the cheek into a pleasant shape and using it as a door frame However, it is usual to make the circular baffle in transparent material, in which case the hinge (s) ) and the door latch (s) are visible through said cheek In addition, it is sometimes necessary to give the door frame a square shape, in which case

  it is preferable to have an independent door frame

while.

  However, because the frame is af-

  4 has effectively overcome manufacturing constraints which are inherent in known dryers, it is possible

  to make the frame in plastic material molded in fa-

  Lesson to eliminate the problems of corrosion and limitation of shape In addition, by using adequate pigments, it is possible to give the door frame

  any desired coloring.

  The air sealing strip can be laid in the groove of the circular baffle from a determined length of strip, in which case this strip must be cut exactly to the desired length and be held in place in the groove, for example using an adhesive agent Preferably, however, the opening of the groove is oriented radially towards

  the outside of the circular baffle, and the strip of

  tightness in the form of a ring whose diameter is such that to place it in the groove, it is necessary to

  subject the strip to a certain elastic exclusion.

  This approach has the advantage that it is not necessary

  neither to have other means to hold the band in place in the groove nor to cut the band to the

  exact length required Therefore, the price of as-

semblance is significantly reduced.

  The combination of throat and band

  seal can be such that this strip comes into con-

  tact with the body wall only around the

  edge of the body opening This provides a-

  vantage that the tightness results from a jamming instead of the direct compression of the joint as it is the case: 0 in the known dryers We have as a result that the

  very low tolerances which formerly were indis-

  thinkable to achieve exactly the required dimension

  between the door and the body are no longer necessary.

  Therefore, the door hinge (s) and the latch (s) can be made with tolerances

much larger.

  In the tumble dryer mentioned in said British patent, the protective ring is integral with the circular baffle because it is glued to it. According to an embodiment of the tumble dryer

  according to the invention, the protective ring and the chi-

  circular cane are made from a single piece of material

  re molded This now allows to further reduce the assembly costs In addition, although the mold necessary to make the circular baffle is more complicated due to the addition of the protective ring to the baffle, it does not cost never more than the two molds

  which are necessary according to the known technique, in part

  especially because a single molding cycle is enough

  instead of two, as well as the fact that he was not born

  stop welding or carrying out

another method of attachment.

  The following description, opposite the

  if appended, all given as an example, will do well

  understand how the invention can be realized.

  Figure 1 is a schematic plan view

  than a drum dryer according to the invention.

  Figure 2 shows on a larger scale the door and the establishment of airtightness in

  the dryer drum according to FIG. 1.

  In FIGS. 1 and 2 in question, a bodywork 1 has a front wall 2 and contains a drying drum 3 capable of turning around a practically horizontal axis 5 under the action of a motor 4

  (via a belt, not shown).

  A body door 6 is hinged, using

  yen not shown, at the front wall 2, and is designed to close an airtight opening

  7 defined by its edge 8 and formed in the wall 2.

  The drum 3 is provided with a pivot 9 at one of these ends

  while at its other end it has an opening

  central circular structure 11 which is adjacent to the opening

  re body 7 and aligned with it so that in the case where the door 6 is open, objects to be dried can be loaded into the drum 3 through said opening 7 and the circular opening 11 for

  then be extracted from the drum through said or

  vertures. The door 6 comprises a circular baffle 12 which is placed coaxially with the axis 5 and which extends in the form of a bowl towards the interior of the bodywork

  so that the bottom of this chicane-constitutes a wall-

  sound 13, which partly closes the circular opening 11 when the door 6 is in the closed position as the

show the figures.

  The annular slot between the partition 13 of the baffle 12 and a flange 14 of the drum 3 which defines

  circular opening It contains a protective ring

  tion 15 molded in one piece with the baffle circu-

  area 12 and preventing objects from drying in the drum

  to enter the slot The protection ring 15 com-

  carries perforations 16 which are small enough to prevent small objects from passing through

  through the ring, but which present air to the

  nance of the drum free passage to a circular guide 17 formed by a guide wall 18 and the front wall

2 of the body 1.

  When using this tumble dryer, air is introduced into the bodywork, for example through a grid 19 placed in the bottom of the wall 2, passes over the heating elements 21 placed in the rear part of the drum 2, through the perforations 22 of

  the wall of the drum, by the drum 3 and all the articles

  keys to be dried in the drum, by the

  holes 16 of the protective ring 15 to arrive thus in the guide 17 before then passing through

  a fin wheel 23 actuated for example by a mo-

  tor 4, the air finally being extracted from the bodywork

  through an outgoing air guide 24 Another possibility

  the only thing is to blow the air instead of sucking it in, the air

  blown through the drum in a known manner, pre-

  cited for example in the British patent already cited.

  The special arrangements for the passage of hot air through the drum and the protective ring are without

  importance for the present invention.

  In its rotational movement, the tamnbour

  3 is supported by a number of supporting elements

  port 25 with which the rim 14 of the drum 3 comes into contact These elements 25 are integral with a wall of

  annular support 26 formed on the wall 18 of the guide 17.

  The spaces between adjacent elements can be filled

  folds for example of a fibrous material 27, for example of felt, in order to avoid in this way an air leak in

  origin of the drum between two elements 25.

  The side wall of the circular baffle 12 has an annular groove 28 formed in said wall so that the opening of the groove is oriented

  radially outward from the baffle, and in ladi-

  throat 28 there is an elastic band 29 ensuring

  airtightness This strip 29, for example in-rubber

  chouc or rubbery material, has the shape of a ring (that is to say that it is endless), and has a diameter such that during assembly it is necessary to impose on the strip a certain extension to bring it into the throat With such a loop, we should not

  not have other means or adhesive agent for hand-

  hold the sealing strip in place in the groove.

  When, as shown in the figures, the door 16 is in the closed position, the outer part of the strip 29, that is to say the part farthest from the strip part located in the groove, rests against a

  cheek 31 molded in one piece with the rest of the chi-

  cane 12, while the intermediate part of the strip is in contact with the edge 8 while being elastically

  curved by it Therefore, the band 29 assu-

  re air tightness directly between the circling baffle

  ring 12 and the body wall 2 It is obviously

  It is also possible to provide the groove around the inner edge of the cheek 31, but in this case it may be necessary to use an adhesive agent or fasteners.

  to keep the sealing strip exactly in place

  this in the groove In addition, the sealing strip can alternatively be designed so as to come into contact with the flat outer surface of the wall 2 instead

  to enter only contact with edge 8 of the opening

  It is not essential that the outer part of the strip 29 rests on the cheek 31 or, in fact, that the

  tape has such a part Therefore, the sec-

  transverse tion of the strip 29 can for example be

triangular or semi-circular.

  A door frame 32 made of molded plastic is fixed to the cheek 31 using screws

  self-tapping (not shown) screwed into bos-

  ad hoc hollow sages 33 provided around the door frame.

  Because the closing and sealing functions of door 6 are performed by the circular baffle

  12, the door frame 32 can affect any suitable form

  quate defined by the articulation and ver-

  rusting used Because of this, the door is workable

  simply molded plastic.

  Preferably, the circular baffle 12

  obtained by molding an optical plastic-

  transparent for example a double polymer of

  styrene-acrylonitrile, so the bulkhead of chi-

  cane 13 acts as a window through which it

  is possible to observe the contents of the drum.

Claims (3)

  1 Drum dryer with a car-   body containing a drying drum capable of   turn around a horizontal axis, a car door   bodywork for airtightly closing an opening (7) made in the bodywork, a central circular opening (11) which is made in a drum end adjacent to the bodywork opening and which with respect to said opening   bodywork is carried out in such a way as to allow   production of objects to be dried in the drum and the exit of these objects when the door is open, while this door comprises at least one circular baffle in the form of a bowl (12) which is coaxial with said horizontal axis and which, towards the interior of the bodywork extends so that the bottom (13) of the   baffle constitutes a partition partially closing the   said circular opening (11) when the door is in the closed position, while the annular slot which remains between the baffle wall (13> and the edge   of the circular opening (11) is occupied by one year   protective cover (15) integral with the baffle wall and intended to prevent objects from entering the slot, said protective ring being provided with perforations which allow the passage of air fairly freely through the slot, characterized in what in the vicinity of the opening (7) made   in the bodywork, the wall of the baffle circulated   re (12) is provided with an annular groove (28) in which there is an elastic sealing strip   air (29) positioned so that the door is closed   mée, said strip seals air direct   between the circular baffle (12) and the body series (2).   Drum dryer according to claim   tion 1, characterized in that the opening of the groove (28) is oriented radially towards the outside of the circular baffle (12), and the sealing strip (29) has the shape of a ring whose diameter is such that   to place it in the throat it is necessary to   put the band at a certain elastic extension.   3 Drum dryer according to one of the   vendications 1 or 2, characterized in that the combination   origin of the groove (28) and of the sealing strip (29) is such that this strip comes into contact with the body wall (2) only around the edge   (8) of the opening of the bodywork.   4 Drum dryer according to one of the resales   dications 1 or 2, characterized in that the protection ring and the circular baffle are made of single piece of molded material.