FR2627550A1 - VERTICAL AXIS AEROTHERM - Google Patents

Abstract

The present invention relates to an air heater with a vertical axis comprising an expansion chamber 1 open at its two upper and lower ends, 1 motor-fan unit 2, 3 mounted across the upper orifice of the expansion chamber and blowing from air downwards an air diffuser 5 at the lower part of the expansion chamber, this diffuser comprising a central core and a vertical peripheral wall surrounding at a distance the central core 6 and a vertical peripheral wall 8 surrounding at distance between the central core and air distribution fins 9 with adjustable orientation, arranged in the annular outlet orifice being mounted to rotate about radial axes. This air heater is characterized in that the side wall 7 of the central core 6 and the outer peripheral wall 8 of the diffuser 5 are formed by prisms with straight sections in the form of regular homothetic polygons.

Description

The present invention relates to an axis heater

  vertical ensuring air distribution in effect cyclone.

  Unit heaters are devices placed generally

  to the upper part of premises with a view to ensuring in these premises, conditions of comfort and in particular to maintain an appropriate temperature. These vertical axis fan heaters generally comprise an expansion chamber open at both its upper and lower ends and a

  motor fan assembly mounted across the upper port

  of the expansion chamber and blowing air down through this enclosure. In this chamber can be

  housed also a blast air heater battery.

  At its lower part the heater comprises a diffuser constituted by a central core which. delimits, together with the outer wall of the diffuser, an outlet orifice

  ring across which fins of

  air tribution mounted respectively pivoting about radial axis. Such a heater is described for example in US-A-2,332,762 and FR-A-2,552,861.

the applicant.

  The heater according to the patent FR-A-2 552 861 allows

  to obtain at its exit a distribution of air in effect cyclo-

  unlike conventional air heaters which provide a sting air distribution in which the air velocity at the outlet of the apparatus is only axial, the axial direction being orientable relative to the axis of the device, by blades or blades. On the contrary, in a cyclone-type air-heater, the only axial component of the air velocity at the entrance to the diffuser is transformed into three parts.

  components, namely a radial vector, a tangential vector,

  and an axial vector, at the output of the diffuser. The vec-

  radiator is essentially produced by the impact of the jet

  internal air on the diffuser core, the tangen-

  tiel is produced by the deflection of the air jet by

  of the diffuser while the axial vector is the

  sultante radial and tangential vectors with the initial axial velocity. For a given initial speed and fixed by the ratio between the flow of the device and the section of the annular outlet orifice, the simple inclination of the fins of the diffuser makes it possible to give the cyclone the shape

  of jet adapted to the conditions of implantation of the

  mera. The heater therefore makes it possible to produce a conical spiral-shaped jet whose range is adjustable at will within a predetermined range according to

  the flow rate of the device and the initial

  Thus, the same apparatus can be installed at a chosen height as desired, depending on the desired comfort conditions, between a maximum height and a minimum height. Moreover, in the center of the conical spiral-shaped jet there is a central depression whose amplitude is directly a function of the relative diameter of the central core of the diffuser. This depression causes the creation of a zone

  mixing air masses ensuring perfect homogeneity

  tion. At the periphery is a low pressure zone

  recycling of air masses by suction on the motorcycle

  fan, which allows to move, by induced effect,

all the air masses of the room.

  The present invention relates to improvements made to such a heater for the purpose of canceling to the maximum

  the parasitic axial velocity of the jet of air at its exit from the

  fuser and to facilitate the adjustment of the orientation of the

broadcasters.

  For this purpose this vertical axis heater with

  an open relaxation area. at both ends

  lower and lower, a motorcycle fan assembly mounted across the upper orifice of the expansion chamber and blowing air down through this expansion chamber, possibly a battery conditioning

  the air blown, and an air diffuser to the inferior part

  of the expansion chamber, this diffuser comprising a central core and a vertical peripheral wall surrounding at a distance the central core so as to delimit between them

  an annular outlet orifice, and distribution fins

  adjustable air flow. arranged in the o-

  rifirp annilaiirp ri anrtie PnEtnt rotatably mounted

2627550.

  around radial axes. characterized in that the side wall of the central core and the outer peripheral wall of the diffuser are formed by section prisms

  straight in the form of homothetic regular polygons.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a non-limiting example of an embodiment of the present invention with reference to the accompanying drawings in which: FIG. 1 is a view in vertical axial section,

  partly in elevation, of a heater according to the in-

vention.

  Figure 2 is a bottom view of the heater

with partial tearing.

  Figures 3 and 4 are perspective views of

  the heater, taken from below. -

  The heater of vertical axis xy according to the invention which is shown in the figures of the drawing, comprises, at its upper part, an expansion chamber 1 which is

  open at its upper and lower extremities. In

  towards the upper orifice of the enclosure 1 extends a group

  eg motor-fan consisting of a ventilator proper 2, of vertical axis, driven in rotation by a motor 3

  which is carried by the enclosure 1 by means of spacers appli-

  propriate. The motor-fan unit 3 is arranged in such a way

  to blow air down as' it is indicated by

the arrows in Figure 1.

  When the heater according to the invention is used

  as a hot air generator, it includes, at the

  inside the enclosure 1 and below the motor-fan unit

  2.3, a heat exchanger 4 of any suitable type and which is preferably constituted by a spiral battery formed of tubes traversed by a heat transfer fluid (water, steam, gas) or even by a heating resistor

  spiral wound or any other equivalent means of

  slow. At its lower part the expansion chamber I is extended by a diffuser 5 which essentially comprises a central core 6 with a side wall. vertical 7, an outer vertical peripheral wall 8, and air distribution fins 9 which are arranged in the annular outlet orifice delimited between the side wall 7 of the core 6 and the outer peripheral wall 8 of the diffuser. Each of the air distribution vanes 9 is rotatably mounted about a radial axis and is integral for this purpose with a shaft 11 extending radially and whose parts

  extremes pass through coaxial holes drilled

  in both vertical walls 7 and 8. In

  the non-limiting example shown in the drawing the airther-

  has sixteen air distribution fins 9,

  regularly around the xy vertical axis. these fins being adjacent to each other. All the fins are mounted in the same way and each fin 9 has a dihedral shape whose two faces 9a, 9b inclined one

  compared to each other. meet at a ridge 9c.

  The fin 9 is fixed to its shaft 11, for example by means of

  age, near its edge 9c. One of the faces 9a is

  inclined downwards, from the axis of rotation 11 tan-

  say that the other side 9b is inclined upwards forming

thus an obtuse angle.

  According to the invention, the vertical walls 7 and 8 which

  constitute respectively the lateral wall of the central nucleus

  tral 6 and the peripheral wall of the diffuser 5 are constituted

  killed by prisms with straight sections in the form of

  homothetic regulars, to number of side equal to that of the fins 9, for example. The side wall 7 of the central core 6 thus comprises sixteen elementary faces 7a and in the same way the peripheral wall 8 of the diffuser comprises

  sixteen elementary faces 8a. Viewed in plan each facet

  7a of the side wall 7 of the core 6 and the face

  elementary facing 8a of the peripheral wall 8 constituting

  respectively kill the small and large base of a trapeze

  isosceles and the axis of rotation of each fin of

  air 9 extends radially through the media

bases of this trapeze.

  Thanks to the polygonal shape of the walls 7 and 8, it is possible to conform the air distribution vanes 9 to fineln nude the inner 9d and outer 9e edges of each fin 9, which are parallel to each other, respectively adjacent to the elementary faces 7a and 8a

  of the two walls 7 and 8. The maintenance of the edges 9d, 9e close to

  immediate proximity of the respective elementary faces 7a, 8a is ensured regardless of the angular position occupied by

  the air distribution vane 9 around its rotational axis

  tion. To allow the return of all the fins 9 to

  the interior of the diffuser, when the delivery of the

  the inclined face 9a which normally extends towards the

  low, protruding below the lower edge of the peripheral wall

  8, is shaped so that once returned to the horizontal position, as shown in Figure 2, its outer edge 9e exactly matches the profile of two adjacent external elementary faces 8a, forming an obtuse corner dihedron, the peripheral wall 8. In other words, its outer edge forms at this point an obtuse angle of the same

  open value in the direction of the xy vertical axis.

  With the arrangement just described it is possible to obtain a perfect fitting area between the fins 9 and the walls 7,8. on the height of these walls, which is for example 100mm. This adjusted zone ensures a seal between the fins 9 and the walls 7,8 which forces the air to follow in all the orientation imposed by the fins 9, this whatever their inclination, whereas this is not possible when the heater has

  circular walls. The polygonal walls 7, 8 with

  7a, Ba thus make it possible to control the axial vector of the speed while always avoiding an axial speed

  parasite which in any case thwarts the desired effect.

  Moreover, as can be seen in FIG. 2, the fins 9 overlap each other, seen in the axial direction, and whatever their inclination around

  11. This recovery also contributes to the

  to cancel the parasitic axial speed.

  The heater according to the invention also comprises a centralized adjustment device for the inclination of all the air distribution fins 9. This adjustment device is housed in the central core 6 which comprises a

  upper horizontal flank 12 and a lower horizontal flank

  13 with polygonal peripheral edges and which

  between them the lateral-polygonal wall 7 of the central core 6. The lateral wall 7 and the two horizontal flanks

  rate 12,13 thus constitute a box containing the inte-

  the mechanism of the adjustment device. This mechanism comprises a vertical axial screw 14 rotatably mounted at its two ends in the center of the two horizontal flanks 12, 13. The lower end of this screw 14, located under the lower flank 13, is secured to an actuating nut wing 15 and on the screw 14 is screwed a nut 16 which is welded a horizontal adjusting plate 17. This plate 17 is locked in rotation by means of one or more axes 18 which extend vertically through the plate 17 and

  which are attached at their lower and upper ends

  res, respectively to the flanks 13 and 12. The or the axes 18 can be used for the assembly of the two flanks 12,13 on the

  upper and lower edges of the side and vertical wall

  Wedge 7 and their tightening on these edges. The setting board

  ge 17 carries, at its periphery, radial lugs 19, re-

  departed regularly around the vertical axis and in number equal to that of the fins 9 that is to say the number of sixteen in the case of the example described. Each lug 19 is disposed near a radial shaft Il and it is coupled to this shaft being engaged in a fork of a plate to

  fork 21 secured to the inner end of the shaft.

  11. Therefore, when it is desired to modify the

  all the fins 9 of air distribution, it is sufficient to turn in the appropriate direction the screw 14, by means of the wing nut 15. The rotation of the screw 14 is reflected in a rise or a descent of the nut 16 and the adjustment plate 17 because this plate is locked in rotation. The rise or the corresponding descent of the erqots 19

  translates into a pivoting of all the turntables

  21 so that all the radial shafts are driven in rotation in the same direction and at the same angle, in order to move all the distribution fins of si-r 9 in the

  same inclined position relative to the horizontal.

  The pitch of the screw 14 allows ai.nsi to obtain a

  thin and uniform fin 9 and consequently a

  fine and homogeneous formation of the cyclone formed at the exit of the ap-

  the same. Of course the screw 14 could be driven by

  any other device or mechanism and it

  In particular, it should be controlled remotely by an engine.

Claims (9)

  1.- vertical axis air heater comprising a housing   the trigger (1) open at both its upper and lower ends. a motor-fan unit (2,3) mounted across the upper orifice of the expansion chamber (1) and blowing air downwardly through this chamber   relaxing (1). possibly a battery (4) of condi-   air supply. and an air diffuser (5) at the lower part of the relaxation chamber (1), this   diffuser having a central core (6) and a perimeter wall   vertical phérique (8) remotely surrounding the central core (6) so as to delimit therebetween an annular outlet orifice, and adjustable-direction air distribution fins (9) arranged in the annular outlet orifice being rotatably mounted about radial axes, characterized in that the lateral wall (7) of the central core (6) and the outer peripheral wall (8) of the diffuser (5) are constituted by section prisms   straight in the form of homothetic regular polygons.   2. An air heater according to claim 1 characterized   rised in that. seen in plan. each elementary face (7a)   the side wall (7) of the core (6) and the elemen-   facing (Ba) of the peripheral wall (8) constitutes   respectively kill the small and large base of a trapeze   isosceles and the axis of rotation of each fin of   air (9) extends radially through the middle places of the bases of this trapeze.   3. Air heater according to any one of the   prior art, characterized in that the edges   dull (9d) and external (9e) of each fin (9), are respectively adjacent to the elementary faces (7a.8a) of two walls (7,8).   4.- Air heater according to any one of the   preceding dications characterized in that each fin (9) has a dihedral shape whose two faces (9a.9b),   inclined relative to each other, meet each other   wind an edge (9c). one of the faces (9a) being inclined downwards from the axis of rotation (11) while the other face (9b) is inclined upwards by forming thus an obtuse angle.   5. Air heater according to claim 4   in that the inclined face (9a) of each fin (9) which extends normally downward, projecting under the lower edge of the peripheral wall (8). is shaped so that once returned to the horizontal position, its outer edge (9e) matches exactly the profile of two adjacent external elementary faces (8a), forming a   obtuse corner dihedron, peripheral wall (8), other-   its outer edge forms an obtuse angle at this point   of the same value open in the direction of the vertical axis (xy).   6. Air heater according to any one of the   preceding dications characterized in that the fins (9) overlap each other. seen in the axial direction, whatever their inclination around their axes respective ones (11).   7. Air heater according to any one of the   previous indications, characterized in that its central nucleus   tral (6) has an upper horizontal flank (12) and a   flanchorizontal lower (13) with poly-peripheral edges   gonaux and which enclose between them the poly-   gonale (7) of the central core (6), the par paroi lateral (7) and the two horizontal flanks (12,13) thus forming a box containing inside a setting device   centralization of the inclination of all the fins of dis- air tribution (9).   8. Air heater according to claim 7, characterized   in that the adjusting device comprises a screw   vertical axis (14) rotatably mounted at both ends.   at the center of the two horizontal flanks (12,13), the former   lower end of this screw (14) is integral with an actuator (15) and on the screw (14) is screwed a   nut (16) to which a horizontal adjustment plate is welded   tal (17), the plate (17) is locked in rotation by means of one or more axes (18) which extend vertically in   crossing the plate (17) and which are attached to their ex-   lower and upper tremities, respectively fiancs (13,12), and the setting plate (17) carries, at its periphery, radial lugs (19), distributed regularly   around the vertical axis and in a number equal to that of the   7, and each lug (19) is arranged close to a radial shaft (11) and is coupled to this shaft by being engaged in a fork of a forked plate (21).   integral with the inner end of the radial shaft (11).   9. An air heater according to claim 8 characterized   in that the axis or axes (18) serve for assembling the two sidewalls. horizontally (12,13) on the upper and lower edges of the side and vertical wall (7) and their tightening on these edges.