FR2542554A1 - HEATING APPARATUS, IN PARTICULAR FOR SWITCH CABINETS - Google Patents

Abstract

THE INVENTION CONCERNS A HEATING APPARATUS, IN PARTICULAR FOR SWITCHING CABINETS. IN THIS APPARATUS, A CONTACT BLOCK 10 INCLUDES DIFFUSION FINS 11, 12, 13 ON ALL ITS LONGITUDINAL FACES, EXCEPT ONE OF THESE FACES. HOUSING WITH HEATING ELEMENTS ARE PROVIDED IN THE FORM OF BLOCK HOLES IN THE LONGITUDINAL FACE FREE OF FINS. AN AXIAL FAN 40, INSTALLED ON AT LEAST ONE OF THE EXTREME SIDES OF THE CONTACT BLOCK 10, COVERS THE FRONT SIDE OCCUPIED BY ITS BLOCK 10 AND ITS DIFFUSION FINS 11, 12, 13. APPLICATION TO HEATING DEVICES FOR CONTROL UNITS SWITCHING.

Description

The present invention relates to a device

  heating elements having thermal heating elements

  conductors incorporated in one-block dwellings

  metal contact, in particular for control cabinets

  tation, apparatus in which diffusion vanes

  protruding outwards and oriented longitudinally-

  are integrally formed on said contact block. A heater of this type is known from Utility Model DE-U-80 26 584 In this case,

  As a heating element, a coef-

  ficient of positive temperature which is in good connection

  thermally conductive with the contact block and heats that

  The heated contact block radiates heat and,

  this, heats the internal space of a switch cabinet

  similar installation or installation Diffusion fins

  then enlarge the diffusion area of the con-

  tact. When the heating elements incorporated in the contact block have only a limited heating power, the heating process of the internal space of

  the switch cabinet takes a lot of time.

  Once the internal space of this switch cabinet is

  tion was brought to the desired temperature, the power

  of the heating appliance is clearly sufficient

  to compensate for heat loss To keep heating time within limits

  to a certain extent, the heating power

  known heating appliances is calculated very

large.

  The object of the invention is to provide a heating appliance of the aforementioned type, in which the heating process can be shortened considerably while using a low heating power, which, however, may be necessary.

  a considerably larger size.

  According to the invention, this object is achieved by the fact that the contact block is provided with diffusion fins on its longitudinal faces, placing

  except for a longitudinal side which is free from diffusion fins

  if we; in that the housings of the heating elements are produced in the form of blind holes in said longitudinal face which is free of diffusion vanes; and in that an axial fan, installed on at least one end face of said contact block, covers the front face lined with diffusion fins of said contact block.

  With the help of a small axial fan of

  corresponding situations, it is possible to accelerate

  the diffusion of heat ensured by the diffusion vanes of the contact block, so that the quantity of heat necessary for the heating process of the internal space of the switching cabinet to be heated is available in a certain period of time. of time significantly

  shorter The heating power of the heating unit

  fage can therefore be adapted in a more

  male to the size of the switch cabinet and did not

need to be calculated wide.

  The wiring and the connection of the heating elements incorporated in the contact block are facilitated by the fact that the longitudinal surface free of diffusion fins extends on the diffusion fins of the contiguous longitudinal face of the square-shaped contact block and it supports in its extreme region delimiting walls which, protruding perpendicularly, delimit a grove-shaped housing; and in that these boundary walls are provided on their outer faces with diffusion fins. This housing can receive the connecting members necessary for this purpose, as well as

than a thermostat.

  According to one embodiment, the connection between the axial fan and the contact block is achieved by the fact that said square-shaped contact block and the diffusion fins formed in one piece on the three longitudinal faces cover one face. frontal I

  square shape; and by the fact that the diffusion vanes

  The corners of this square are thickened at their ends and are provided at the end face with a fixing housing. In this case, the square arrangement of the connection zones has the advantage that the axial fan can be installed. on the contact block in each

  of its four offset positions of 900.

  According to one embodiment, to form the connection zones on the contact block without limiting

  the fins of diffusion, these fins project perpendicularly

  on the wide longitudinal faces of a block

  contact area of rectangular section, the diffusion fins

  oriented towards the narrow longitudinal face without fins flush with this longitudinal face, being thickened at their ends and being endowed on their faces

  extreme fixing housing; diffuser fins

  protruding in each case at an angle of 135 relative to the adjacent longitudinal faces are formed in the transition zones between the wide longitudinal faces

  the contact block and the other narrow longitudinal faces

  theses of said block, said fins being thickened at their ends and provided with fastening housings at their end faces; and said diffusion fins inclined by a

  angle of 1350 are provided on their upper faces with

  scattering letters of decreasing and stepped section, the ends of which end on the square occupied by the block

  contact and diffusion fins.

  When, in accordance with an improvement,

  it is expected that the thickened ends exceed slightly

  beyond the neighboring diffusion fins and be

  in their regions projecting from longitudinal grooves

  to insert plates made of sheet metal

  it is possible to manage in a suitable manner

  the air flow of the axial fan through the ducts

  greens formed between the diffusion fins.

  According to the invention, in this heater, the air flow can be further increased because axial fans are installed at the two end faces of the contact block, one of its fans being made in the form of 'a pressure fan

  and the other in the form of a suction fan.

  To incorporate the connecting members necessary for the wiring and connection of the heating elements and a thermostat possibly required, as well as for connecting these connecting members to the contact block, an embodiment provides that the longitudinal face without fins of diffusion supports between the delimiting walls of the double ribs fastened longitudinally fixed attachment It may further be provided to subject to these double fastening ribs

  contact block a thermostat and connection terminals

  on which the connecting cables can be

  heating elements and the thermostat.

  According to another embodiment, to cover the connection members without any contact,

  the housing formed by the longitudinal face of the block of con-

  tact free from diffusion fins and through the walls of

  delimitation may be closed by means of a sheet of

  U-shaped bent, the end faces of said boundary walls being provided on their internal faces facing each other, a recess intended to be applied against said U-shaped cover plate In this case, when the middle branch of this U-shaped cover plate protrudes by fixing flanges beyond the boundary walls of the contact block and supports permanent holding studs for securing said U-shaped cover plate to said boundary walls, the heater can be fixed via

  said U-shaped cover plate, said nipples of

  your house permanently ensuring non-rotating solidarity

  said contact block and said cover plate.

  In addition, to fix the U-shaped cover plate on the contact block, it is provided that the lateral branches of this U-shaped plate are provided with fixing housings oriented towards the double fixing ribs of said contact block; and that one of these side branches is

  pierced with a hole for introducing a cable.

  Another advantage of the heating apparatus according to the invention is that the heating power can be increased in a simple manner. For this purpose, according to another embodiment, it can be provided to group in a larger unit of heating several contact blocks provided with heating elements, by juxtaposing them with their end faces When the air stream intended to promote the heat diffusion provided by the diffusion vanes is not sufficient, it is provided, in another form embodiment, to group together in a larger heating unit a plurality of contact blocks provided with heating elements, using

  each time an axial fan.

  The invention will now be described in more detail by way of non-limitative examples, with reference to the accompanying drawings in which FIG. 1 is an exploded representation of the parts necessary for the formation of the heating apparatus in accordance with FIG. invention; and FIG. 2 is an enlarged view of the

  housing formed in the longitudinal face of the block of con-

  tact without fins, and intended to receive the organs

connection and the thermostat.

  A contact block 10 of the heater consists of a profile section The core of this block

  proper is of rectangular section of the fin.

  11, 12 and 13 are developed on both sides

  wide longitudinal and on a narrow longitudinal face.

  In this case, the last diffusion fins 11 and 13 widen the narrow longitudinal face of the contact block 10 without fins, since said fins

  come flush with this longitudinal face In areas -

  transition between the two broad longitudinal faces comprising the fins 11 and 13 and the longitudinal face

  narrow wing with diffusion fins 12, other ailerons

  The outer faces of these fins support shortened diffusion vanes 11, 12 and 13, so that the end faces of the contact block 10 and the fins 11 are arranged at a respective angle of 1350 with respect to the adjacent longitudinal faces. 12

  and 13 overall occupy a square area.

  These diffusion fins oriented at 1350 are thickened at ends 20 and have in their faces

  extremes of the fixing housing 23 The last

  11 and 13, coming close to the narrow longitudinal

  The fastening housings 23 and 26 can be made in the form of threaded blind holes, and are free of fins of the contact block 10, which are also thickened at ends 24 and provided in their end faces with fixing holes 26. or still in the form

  simple blind holes in which screws 48 autotarau-

  These screws are inserted with these screws 48, a fan

  40 is connected to the end face of the contact block 10.

  The axial fan 40 has a square surface which is covered by the end face occupied by the contact block 10 and the diffusion vanes 11, 12 and 13. In this case, a connection plate 41 is screwed into the fixing housings 23 and 26 by means of fixing holes 42 A connecting plate 43 pierced with fixing holes 44 is covered by a grid, screws 49 being screwed into said fixing holes 44 through eyelets 46 and 47.

  the connecting plates 41 and 43 are of configuration

  identical, the axial fan 40 peult; be connected to the contact block 10 by the outlet of the compressed air or by

the suction inlet of this air.

  The ends 20 and 24 of the diffusion fins

  are slightly protruding beyond the contiguous fins 11 and 13, 11 and 12 or 12 and 13 respectively and

  have in their salient regions longitudinal grooves

  dinales 21, 22 and 25 which make it possible to slidably insert plate cover plates 27, 28 and 29 Thus, on the three longitudinal faces provided with diffusion fins 11, 12 and 13, the ends of these fins 11, 12 and 13 can be covered, which gives rise, between said fins 11, 12 and 13, to closed channels through which the air flow of the axial fan 40 is expelled or sucked When the two extreme faces of the block

  contact 10 are of identical design, it is also

  It is also possible to mount on the contact block 10 two axial fans 40. In this case, the installation takes place so that one of these axial fans 40 performs the functions of a pressure blower and the other of a pressure blower. suction blower The two axial fans 40 then assist the air flow that passes through the channels located between the diffusion vanes and dissipates more rapidly the heat of the diffusion fins 11, 12 and 13 The fixing housing 23 and 26 contact block

  can also be used to align jux-

  taposition several contact blocks 10, either directly,

  either via axial ventilators 40.

  The longitudinal face of the contact block 10 without fins, which extends on the fins 11 and 13,

  has in its extreme regions walls of delimitation

  14 and 16 protruding perpendicularly, which

  define a throat-shaped accommodation to receive

  connecting members and the thermostat On their outer faces, these delimiting walls 14 and 16 are provided with diffusion vanes 15 and 17 consequently having a shorter length and ending in planes common to the diffusion fins 11 and 13. Between the delimiting walls 14 and 16, two double fixing ribs 18 and 19 are produced on the contact block 10. As is evoked by the view according to FIG. 2, self-tapping screws can be inserted directly between the two chords of a fixing rib 18 or 19, which makes it possible to fix connection members Screws 65 and 66 fasten

  then two connection terminals 63 and 64 to the con-

  Two heating elements 53 and 56 are made in the form of heating cartridges provided with a positive temperature coefficient element and they are connected to the contact block 10, providing thermal conduction, and being placed in housings 52 and 55 configured as blind holes These housings 52 and 55 are formed between the double fastening ribs 18 and 19 and the longitudinal face of the contact block 10 without fins A

  thermostat 58 can be mounted on the double rib

  By means of a screw 59, a screw 60 can then be provided to adjust the triggering temperature. Cables 54 and 57 for connecting the heating elements 53

  and 56 can, just like connecting cables 61 and 62

  thermostat 58, be trapped within the limits of

connection 63 and 64.

  On their extreme faces, the boundary walls

  14 and 16 have on their internal surfaces

  born towards each other, recesses 50 and 51 which

  receive and support a cover sheet 30 configu-

  The lateral branches 31 and 32 of this cover plate are provided with fixing housings 34 by means of which said cover plate 30 can be fastened by screwing to the double fastening ribs 18 and 19. further pierced by a hole 33 for insertion of a cable, whereby the connecting cable of the heater to the network can be

  introduced and connected to the connection terminals 63 and 64.

  Permanently maintained pins 38 and 39, made on the middle branch of the U-shaped cover plate 30, receive, by prohibiting any rotation, the delimiting walls 14 and 16 by their diffusion vanes 15 and 17.

  This results in keeping the cover plate in a safe position.

  The middle branch of the sheet 30 has laterally fastening wings 35 and 36 which, projecting beyond the diffusion vanes and delimiting walls 14 and 16, are pierced with holes. fastening 37 so as to connect the apparatus of

  directly to a wall, or through

  of a fixing bracket which allows the user to

  interlocking said one-rail heater.

  It goes without saying that many modifications can be made to the apparatus described and shown,

  without departing from the scope of the invention.

Claims (7)

  1 Heater equipped with thermally conductive heating elements incorporated in housings of a metal contact block, particularly for switch cabinets, in which   diffusion fins projecting outwards and ori-   longitudinally are produced on the contact block, characterized in that said contact block (10) is provided with diffusion fins (11, 12, 13) on its longitudinal faces, apart from a longitudinal face free of fins; in that the housings (52, 55) of the heating elements (53, 56) are formed as blind holes in the longitudinal, fin-free face; and in that an axial fan (40), installed on at least one end face of said contact block (10), covers the front face occupied by this block of   contact (10) and by the diffusion fins (11, 12, 13).   Heating apparatus according to Claim 1, characterized in that the fin-free longitudinal surface extends on the diffusion fins (11, 13) of the adjacent longitudinal faces of the square-shaped contact block (10) and supports in its extreme region,   delimiting walls (14,16) protruding perpendicular-   and delimiting a throat-shaped dwelling; and in that said boundary walls (14, 16) are provided with diffusion fins (15, 17) on their outer faces.   3 Heating apparatus according to one of the   1 and 2, characterized in that the square-shaped contact block (10) and the diffusion fins   (11, 12, 13) integral with the three longitudinal faces covered   a square frontal face; and in that the diffusion fins oriented towards the corners of this square are thickened at their ends (20, 24) and have in their end faces a respective fixing housing. (23,26).   4 Heating apparatus according to any one   Claims 1 to 3, characterized in that the   diffusion fins (11,13) protrude perpendicularly   beyond the wide longitudinal faces of a contact block (10) of rectangular section, the diffusion fins turned towards the longitudinal-narrow face   free of fins coming flush with this longitudinal face   nale, being thickened at their ends and having the attachment housing (26) at their end faces; in that in the transition zones between the wide longitudinal faces of the contact block (10) and the other narrow longitudinal face of this contact block (10), diffusion vanes-which are oriented a respective angle of 1350 relative to the adjacent longitudinal faces, are thickened at their ends (20) and are provided with fixing housings (23) in their end faces; and in that, on their upper faces, the diffusion fins oriented at 135 are provided with diffusion vanes (11, 12, 13) of decreasing and stepped section, the ends of which terminate on the square occupied by the contact block (10) and said fins of diffusion (11,12,13).   Heating apparatus according to any one   Claims 1 to 4, characterized in that the   thickened ends (20,24) protrude slightly beyond the adjacent diffusion vanes (11,12; 12,13; 11,13) and have in their projecting regions longitudinal grooves (21,22,25) for to insert by sliding   cover plates (27,28,29) in sheet metal.   6 Heating apparatus according to any one   claims 1 to 5, characterized by the fact that   two end faces of the contact block (10) are axial fans (40), one of which is in the form of a pressure fan and the other is suction fan.   7 Heating apparatus according to any one   Claims 1 to 6, characterized in that the   longitudinal face free of diffusion fins present, between the delimiting walls (14, 16), ribs   double fasteners (18, 19) longitudinally oriented   nally. 8 Heating apparatus according to any one of claims 1 to 7, characterized in that the housing formed by the longitudinal face of the contact block (10) without fins and by the boundary walls (14,16). can be closed by means of a U-shaped cover plate (30), the end faces of said boundary walls (14, 16) being provided on their surfaces   internally turned towards each other, a   respectively (50,51) intended to be applied on said cover plate (30) configured in U. 9 Heating apparatus according to claim 8, characterized in that the middle branch of the cover plate (30) shaped U shaped protrudes by   fixing wings (35,36) beyond the boundary walls   tation (14, 16) of the contact block (10) and includes pins (38, 39) for permanent retention for securing, without any possible rotation, said cover plate   (30) U-shaped to said boundary walls (14,16).   Heating apparatus-according to one of the   8 and 9, characterized in that the lateral branches of the U-shaped cover plate (30) are provided with fixing housings (34) facing towards the double fixing ribs (18, 19) of the contact block (10). ); and by the fact that one of said lateral branches   is pierced with a hole (33) for the introduction of a cable.   11 Heating apparatus according to any one   Claims 1 to 10, characterized by the fact that   thermostat (58) and connection terminals (63,64) are fixed to the double fixing ribs (18,19) of the contact block (10), the cables (54,57,61,62) for connecting the heating elements (53,56) and said thermostat (58) being attachable to said thermostat and said connection terminals. 12 Heating apparatus according to any one   Claims 1 to 11, characterized by the fact that   a plurality of contact blocks (10) with heating elements (53,56) can be grouped into a larger heating unit by being aligned in juxtaposition with their end faces. 13 Heating apparatus according to any one   Claims 1 to 11, characterized in that   a plurality of contact blocks (10) with heating elements (53,56) can be grouped into a larger unit   each time through a ventilation system. axial filter (40).