DE8903234U1 - Fan - Google Patents

Description

· · t ft

6079- 1 IP

Maico Elektroapparate-Fabrik GmbH 7730 Villingen-Schwenningen

Fan

The invention relates to a fan, preferably a wall fan,

Definition: A linear louvre closure is a closure used to close an air passage, which has a plurality of parallel louvres or flaps that can be pivoted about parallel axes of rotation, preferably coupled to one another, to open and close the air passage, usually by means of a coupling rod. They are often also referred to as closure flaps (company catalog of the applicant 19G4/85, p. 135 - 137).

It is common practice for fans to be fitted with a louvre shutter downstream of the fan impeller to shut off the fan.

I · ψ &lgr; r · t · * ·

it ··* ft &igr; ··· » a··

&tgr;&igr; ti ·&igr;&ogr; · · ■* **

60 79- 1 " " -"2 ·■-'

It is an object of the invention to create a possibility in such a fan with a louvre shutter to bring the air flowing through it to a higher temperature without thereby damaging the louvre shutter .

-^ This object is achieved according to the invention in a fan, preferably a wall fan, in that an electric heater is arranged downstream of the louvre shutter for heating the air conveyed by the impeller.

This arrangement of the electric heater downstream of the louvre shutter ensures that the air heated by the heater does not affect the louvre shutter itself. This increases the operational reliability of the louvre shutter and also allows the air to be heated to a greater extent. Such louvre shutters are also normally made entirely or mainly from thermoplastics, which have relatively low melting points. The air heated by the electric heater can therefore easily be heated to temperatures that could be dangerous for the louvre shutter, which is at least partially made of thermoplastics. Even if the louvre shutter is made of thermoplastics, the air is heated to a temperature that could be dangerous for the louvre shutter. If the shutter is made of other materials, e.g. metal, the arrangement of the electric heating downstream of the lamella shutter 1 is also advantageous.

3£> the air heated by the electric heater, if

6079-1 - L)

it directly impacts the lamella shutter and &ggr;, thereby possibly heating up considerably, for thermal

This can lead to stretching, which can have adverse effects, e.g. the risk of the lamellae locking mechanism rattling.

j &ogr; Ks i. s!", known in fans that they have a filter, which is usually in the form of a filter mat, consisting of ordinary plastic fibers arranged in a circle. Such filters only remove relatively large particles from the air .

It is therefore a further object of the invention to improve the filtering of the air in the fan which has at least one filter.

.·_■■' ■.. &igr;.':;-JHiJ ihesüi· Task is &igr; rfi nci u ng 3 q emri ß a

I. &ugr; f I; ii 1 q e 111 aß A &ogr; s &igr;&igr;'&ugr;&igr;:&Igr;&iacgr; 5 provided.

I &eegr; ei e &pgr;&igr; ei the fan has at least pin pollen filter L-gnii dleSGS HSUSC &Iacgr;&Pgr; ¹ JP 1 θ &Pgr; ^u 8 &Ggr; ¹ J &Ggr;"■ 3 C h 6 &Pgr;. d SPO 1 1 β &Pgr; O (j 8 &Ggr; eiql. filter out the air conveyed by the ' .-jfra^·. This is particularly important with a fan that can ^suck in outside air, i.e. especially with a water cooler, ^since then hay odors and pollen are separated from the sucked-in air to a large extent and do not reach the room to be ventilated by this fan or only to a much lesser extent than before. Preferably, the pollen filter or at least

one of the pollen filters downstream of the impeller de; 35

The pollen filter or

» I

ff ·

6079-1 - 4

However, at least one pole filter can often be arranged upstream of the fan impeller, as it also ^fulfils its particularly important function of separating the particles from the air taken in .

Q as I'&ogr; ] 1 e &eegr; f &igr; I I. erk &pgr;&eegr; uej &pgr;&iacgr;-&ogr;&igr; ti stf &igr; I tei" , &ngr;&ogr; r / &ugr;&pgr; , we &igr; se &ogr; j &eegr; M &igr; I &igr;&ugr;&Ggr; i 1 &igr;&igr;? rsei 11 . &Pgr; a &eegr;&khgr; hes &ogr;&igr;&kgr;&Igr; ers &ngr;&ogr; rtei no f 1, &igr;-.' ¹ ^ ej &eegr; ! 1 ek I. &tgr;&igr;: &igr; fill, im , da &Ggr; 1ekLret fi 1 ter despite their

hn special r;; i.uLüii ilterwjrksijmke.it low flow rates v/i the s anrle &iacgr;;&igr;&Igr; ,jh can be even smaller than those of the previously usual coarse filters in Liiiters

5 b i 1 d e ■ ■ d c; &eegr; fiber mats made of conventional plastic aseni

are electret fibers. For example , the electret can contain electret fibers which form a fiber web in the form of a fiber fleece, a ^mat , a fiche or the like. In the fleece or mat, the electret fibers can be connected to one another by gluing or welding, or the fleece can be a neoprene fleece or the like. Electrets are constantly electrostatically charged. Electrets are dielectrics in which positive and negative

^° charges are embedded that generate an outward-acting electrostatic Γ -^ j. c· that can separate pollen and other particles from the air at the electret filter. The electret filter also has an additional mechanical filtering effect. Between electrets and

Magnets consist of a combination of materials; just as magnets attract iron filings, electrets attract particles. Polymer compounds are used as building materials for electrets. The electret filter can be a

Filter-35 sold under the trade name "Filtrete"

be medium .

607S-1 -δ-

If desired, at least one other filter can be installed in addition to the at least one pole filter.

which is not a pollen filter, upstream and/or 5

arranged downstream of the impeller of the fan 3 s c i η .

The &Lgr; u f &rgr; u t z - W a &eegr; d ] u t L o r &eegr; , whose air outlet serves to blow air conveyed by the fan into a ^i ventilated room, it was previously customary to use the ' ' f t 0 U S ] '· ß OP d<?r Frnntu.iniJ &igr; i ■- c tacl-cnfnrminpn fi <=

&mdash;'■&mdash;&mdash;&mdash; _.. &mdash;&mdash; _.-. &mdash; ~j &mdash; . ■ &mdash;&mdash;

The air blown into the room in question by the fan through the outlet can, however, be a problem in some cases, particularly if the wall fan has to be installed relatively low for some reason, e.g. because it has at least one actuating element that can be operated manually by an operator to carry out a change of direction.

must be able to switch the fan on and off, or to switch its heating on and off, etc., without having to climb a ladder. Such a wall fan must then be installed low enough so that even small operators can operate it manually.

operable actuator can be easily operated without the aid of a ladder.

It is therefore a further object of the invention to design such a surface-mounted wall fan with a box-shaped housing, which has an air outlet through which air is blown into a room in a building or the like, which wall fan is therefore a ventilator, in such a way that it can be mounted on 35

. f

607y- &igr; i -'V J- : · : * :": ' :

the relevant wall of the room can be as low as you like b iingenrrlnnf. wijrde&eegr;

This problem is solved according to the invention by

¹ The surface-mounted fan is mounted on a roughly flat area of the circumference of the fan housing, preferably on the ceiling or on a side wall of the housing. This allows the escaping air to be blown into the room at such a speed that it can be directed even when the fan is mounted low on the wall in question.

at the head height of people of normal height, no disturbing draughts are caused in the area of the room in question or in the area of the room in question. It is therefore easy to arrange at least one actuating element of a switch or similar on the surface-mounted wall fan, which can be operated manually from the room by an operator in order to switch the fan on and off, switch a heater on and off, or at least switch one other function.

In many cases it is also expedient to provide that the air outlet has air deflection elements, preferably arranged in a blade grid, with parallel, straight, curved blades that serve to direct the outflowing air in a direction that is oblique to the plane of the housing wall that has the air outlet. For example, the fan can then be arranged on a wall of the relevant building room or the like in such a way that the air outlet, if it is located on a side wall, preferably on an approximately vertical side wall of the box-shaped housing of the fan L^,

6079- .1

Air is blown out in an upward, diagonal direction along the relevant wall on which the fan is located. Even if this air outlet is located on the ceiling of the box-shaped housing, the diagonal blowing out is useful in many cases, for example when the wall fan is located on the wall near a corner of the room and the air deflection elements can then be arranged in such a way that they blow out the air flowing out of the fan's air outlet in a diagonal direction away from this corner.

Wall fans are known which each have a housing in which an impeller is arranged, whereby the fan also has a louvre shutter which serves to shut it off. When opening and closing the louvre shutter, the procedure up to now was to assign it a separate actuator, preferably an electromagnetic actuator or an electric actuator, and to control this electrically in such a way that the actuator opened the louvre shutter when the fan was switched on and returned it to its shut-off position when the fan was switched off. However, it can happen that the electrical circuit for controlling the actuator or the actuator itself fails due to some kind of damage and this often goes unnoticed for a long time and, moreover, such a failure is associated with relatively high costs.

Ls is rlrc shall) nine wcil.nre task of finding L·, at nint'di W a π d 1. ü ft, G r , whose impeller can be driven by an electric 3b drive motor in a

6079- 1 - 3 ·* -

The aim is to achieve this by means of a housing having an air inlet and an air outlet, whereby the fan also has a louvre shutter which serves to shut it off. ¹ ·"" that the louvre shutter is always safely opened when the impeller drive motor is switched on and safely closed again when it is switched off, ie returned to its shut-off position.

This object is achieved according to the invention in that a manually operable switch for switching the drive motor of the fan impeller on and off

^5 Switch is arranged on the housing so that it can be operated from the outside and is mechanically coupled to the lamella closure in such a way that the lamella closure is opened by the manual operation of the switch to switch on the drive motor of the impeller and is closed again by the manual operation of the switch to switch off this motor. It can be expedient to provide that the switch is a rotary switch with a manually rotatable actuating element, on whose shaft, which is coupled in motion to this actuating element and is preferably connected in a rotationally fixed manner, a first element of a cam gear is arranged in a rotationally fixed manner, which is connected to a second element of the cam gear arranged on a coupling rod of the lamella closure for opening and

QQ Closing of the lamella shutter. Such mechanical cam gears are particularly simple in construction and reliable in operation. Lt, it is no longer necessary to open the lamella shutter by means of an electrically powered servomotor and

g5. The cam gear can preferably be

6079- &igr;

1 ' I ·

&bull;9 ·· 14* * * '

be designed so that one of its two members is a pin and the other member has a slot or a curve to guide the pin.

Until now, it was usual for fans, particularly wall fans, to be switched on and off manually. In many cases, however, it is desirable and particularly expedient to provide a possibility that avoids having to switch ^the on and off manually. In order to achieve this, in a fan, preferably a wall fan, whose impeller can be driven by an electric drive motor and is preferably arranged in a housing having an air inlet and an air outlet, the invention provides that a timer is arranged on the fan, preferably on its housing, which is used for the time-programmed switching on and off of the fan. This makes it possible to switch the fan on and off at any desired time that is within the scope of the timer's programming options by programming the timer accordingly. The timer can preferably be used to program the switching on and off of the fan according to the time of day and/or the calendar. For example, in a room to which the fan is assigned for ventilation or exhaustion, and which is only occupied at certain times, e.g. during office hours, it can be provided that it is automatically switched off by the timer towards the end of the occupancy period, be it exactly at the end of the occupancy period or already a little before or after, and only switched on again.

60 79-1 "-TO - - ·

is switched on when the occupancy period begins again or shortly before, so that the room is already supplied with fresh supply air when the occupancy period begins.

If a fan is provided with a housing in which at least one filter is arranged, in which the filter is housed in the housing and is not directly accessible from the outside, it can be expediently provided according to the invention that an opening that can be closed by a cover or a flap is provided on the front side of the box-like housing of the fan, through which the at least one filter can be replaced. Replacing the filter is thus particularly simple and convenient.

In fans according to the invention, the impeller can have any suitable design, ^preferably a radial impeller. A radial impeller is understood to mean an impeller such as those found in radial fans. The impeller can preferably be assigned a guide device with a spiral-shaped pressure channel.

If the fan has at least one filter, this can be conveniently arranged on a cage, preferably on a plastic or wire cage. The cage can preferably be made in two parts. It can be provided that at least one part of the cage can be removed from the fan together with the filter in order to replace it.

The drawing shows an example of the L rf &igr; ndungen. Shown are:

' M]. I &igr;; i &eegr;&igr;;&Ggr; r on L :, a L ige front view, a &igr; it as a surface-mounted wall 1 &ugr; fte &igr; a &ugr; sg ebi 1 rl ti te &eegr; L ü f Lc; rr, according to a Ausf uhr &ugr; ng a Ur. &igr; s &mgr;&igr; e 1 of the L i' fi &eegr; dung,

i H]. ',' the fan &eegr; π ch Fig. 1, but with the front housing part removed,

Fig. 3 a Sch hui Lt through the air vent.. ^! " according to Fit. . 1, ,seen along the section line 3-3 of Fig. 2, &ngr;/ &ogr; however, the front housing part is arranged on the air er,

&bull;■ig 1 a section through the fan according to Fig. 2, seen along the section line 4-4, whereby the front housing part is also arranged on the fan,

-ig. S a view rl > · s L ü f I j r s to F &igr; j . 1 , seen in the direction of arrow A.

"The fan 10 shown in the drawing is an exhaust wall fan which serves to blow outside air into a room 11 of a building or the like, of which a vertical wall 12 is shown in Fig. 3. This fan 10 has a two-part housing 13

60/') &igr; - 1 2 -

consisting of a front housing part 14 and a
rear housing part 15. This housing 13

points. UiH)I)I ,your <| uade r f &eegr; rm i. g e (!shape, on . !je ine

unrjefrihr inch t cc k f O rni i r| en course exhibiting circumference

wall is on the two side walls 54 and 54 ' and on the *

fi &ogr; d e &eegr; 5 5 closed '■ sen.

The housing 13 has in the rear wall 16 of its back- %

w ä r 11 ye &eegr; housing part 15 a the Li ¹ tei &eegr; ia ß this r 3 '&eegr;

Fan 10 forming air intake nozzle 17, which is connected to the ;j

Suction of outside air through an opening 19 in the wall '<

12 and blowing it into the room 11.

On the wall 12 this fan is mounted as a wall fan.1

1 is arranged on the underside of 10. On the outside, the opening 19 ;']

by a decorative grille (not shown) oii:r dg]. '

be covered. .,;

I

The housing 13 is, as shown, box-shaped |j

Its air outlet 20 is connected to a !

essentially flat ceiling 21 of the housing 13
arranged on the flat ceiling 24 of the ^

front housing part 14, which is from the .,and 12 au^
seen slightly diagonally downwards to the horizontal
which is responsible for blowing the air into the
Room 11 is particularly favorable. This air outlet 20
has air deflection elements 22 in the form of

curved guide vanes, which according to Fig. 3 are

are arranged so that the blow-out direction of the air outlet 20 does not run parallel to the wall 12, but is directed slightly away from this wall 12 in an oblique upward direction. This improves the

Ventilation of the room 11 in question by means of the

60 79- 1 - 1.3 -

van <..' :i. e s e m fan 10 blown into the room outside air.

.'.; in this embodiment, the fan KJ

It is only intended for the conveying of air. It is, however, also conceivable to use it for pure air operation, in which it only supplies air to the room 11

intake, or for mixed propulsion with optional '= variable mixing of recirculated air to outside air J. &ugr; ft

-. by, for example, pulling on its underside

(floor 5 ^r >) and/or on a side wall 54 or 5 &Iacgr;' £., J5 a through a flap lockable and preferably variable throttle hare &eegr; recirculation air inlet and/or variable

H Throttling and, if necessary, shutting off the outside air

provides.

H 20 ^ ⁿ inner wall surfaces of the housing 13 and a guide device 30 are sound insulators 2 3, such as.

S made of plastic foam .

In the air intake manifold 17, a hub 2 5 is

\i 25 ribs 26 are arranged immovably on which the drive motor 27 for the impeller 29 forming a rotary wheel of this fan 10 is arranged. The impeller 29 is attached to the rotor shaft of the motor 27.

3Q The impeller 29 is located in the guide device 30, which can correspond to a guide device as is usual in radial fans and has a spiral-shaped pressure channel 31, which widens in cross-section in the direction of rotation of the impeller 27, from which the

3g outside air to a zigzag filter 32

60 7·/- 1 -14-

The air flows through it at a distance of 90 mm behind this filter 32, which serves to shut off the air flow downwards from the inside. The air flow 31 serves to shut off the air flow downwards from the inside at a distance of 90 mm from the filter 32. An electrical heater 34 with a heating element ... ja ng eo rein Rt: , which heats the conveyed air before it exits into the relevant room 11 below.

The electric heater 34 is arranged between the stationary heater P 33 and the stationary heaters 22 of the air outlet 20 .

The slatted closure 33 has a plurality of slats 36, preferably made of thermoplastic material, which are mounted on a frame so as to be rotatable about mutually parallel axes of rotation and are coupled in a movement-locking manner by means of a coupling rod 37 in the manner usual for slatted closures. The coupling rod 37 can ^be moved back and forth in the direction of the double arrow B to open and close this slatted closure 33.

The filter 32 consists of a replaceable fibre mat 32, designed as a random fibre mat, which is held in the zig-zag shape by means of a two-part cage 39 in that thin plastic rods 39', 39" of one cage half 79 deform it into the zig-zag shape together with thin plastic rods 39', 39" of the other cage half 79' and hold it there. Each cage half 79 or 79' has several parallel, wave-shaped

6079- l - 15

curved plastic rods 39' and vertical straight plastic rods 39", which are firmly connected to each other in each cage half.

The two cage halves 79,79' are of the same design and are connected by elastic

IC' snap connections or locking connections 77. This cage 39 with the filter mat 32 can be removed by hand through an opening 45' in the front wall 44 of the housing 13 to replace the filter mat 32, then opened and the new filter mat inserted. The cage 39 is then closed again and reinserted into the housing 13. The opening 45' -j _{can be} closed by a removable or pivoted cover 45 which, like the front wall 44, is approximately flat and does not protrude beyond it. The new filter mat 32 can be an unused filter mat or a cleaned filter mat, or possibly the same filter mat in a cleaned state.

The filter mat 32 forming the filter can preferably be an electret filter, as already explained above. The electret can preferably be formed by electret fibers which are glued or welded to the random fiber fleece forming the filter mat 32 and a pollen filter b 1 1 d e n .

Uinsos C &ogr; I 1 e &eegr; fi 11 t> r '.\7 k ;&igr;&pgr;&pgr; because of the constantly present e 1 Ai ktr &ogr; st &eegr;tisrhr;&eegr; (nicies, el &eegr;&egr; the E 1 r; ktret ffisfjrn iH'wirkon, with, (jcrincjcm '] trömuncjswidersfcnncj still

6079- 1 - 16 - .:. ...*

' ■» · ■

be extremely effective in filtering. This &igr; -electret filter 32 forms a pollen filter, since it removes pollen that causes hay fever from the air flowing through it, be it all pollen or many pollen.

_1�Lgr; Through this pollen filter 32, during the seasons when the risk of hay fever is caused by pollen, air conditions in the building in question 11 are improved by blowing in pollen-free or largely pollen-free outside air.

,, created, which cause that in the room. 11 b

Persons who are at risk of hay fever are no longer exposed to this risk or are no longer exposed to the same extent as before.

In many cases, instead of such a pollen filter 32, a microfilter or fine filter that does not form an electret filter can be provided, which also has the property of a filter that filters out pollen from the conveyed air, and thus

&ldquor; _c also forms a pollen filter. Instead of a &iacgr;&ogr;

In addition to the pollen filter, several pollen filters can also be provided if necessary in order to further increase the degree of pollen separation. If no pollen is to be separated, a normal filter can be used instead of the electric filter, preferably in the form of a Mitra II, II or III filter.

L)ar. P&ogr; 1 1 c&eegr; fi 11G r 3? also has din H ] cjr&pgr;s r. liable, also Staut) and other undesirable particles -'n/s of the air here r;iu5 &zgr; &ugr; fi ] t ern . By, as preferably provided, the

6079- 1 - 17 -

If the filter 32 is arranged downstream of the impeller 29, it also filters out abrasion, dirt or the like caused by the impeller 29 and the electric motor 27 driving it from the conveyed air and thus also makes the outside air blown into the room 11 as supply air even cleaner than if this filter 32 is arranged upstream of the impeller 29, which can also be provided in many cases, particularly if this should be desired for ^safety reasons. The arrangement of the filter 32 downstream of the impeller 29 also further reduces the already low noise that the fan causes during operation.

On the front wall 44, openings for a timer 40, a slider 43 and two rotary knobs 41, 42 forming switch actuation elements are arranged one above the other. The slider 43, which also forms a switch actuation element, is arranged so as to be linearly movable above the timer 40.

Ib The lower rotary knob 42 is the manual actuating element of a switch 61 having the shaft 53 for manually switching the heater 34 on and off, it being preferably possible to provide for several heating stages with different electrical outputs to be switched on. The rotary knob 42 is arranged on the shaft 53 in a rotationally fixed manner.

\- In a manner not shown, the electrical circuit is designed in such a way that the electrical heating ° 3' is always switched off, regardless of

6079- &igr;

the position of the rotary knob 42 when the drive motor 27 of the fan 10 is switched off.

The upper rotary knob 41 is the manual actuating element of a switch 60 for switching the drive motor 27 of the fan 10 on and off. Here too, it can be expediently provided that several different speeds can be switched on in stages by means of this rotary knob 41, preferably two different speeds.

The timer 40 is used to switch the drive motor 27 of the fan 10 on and off according to the time of day and/or calendar time.

The linear switch actuator 43 serves to actuate a switch which serves to switch from manual switching on and off of the fan 10 to time-programmed switching on and off by means of the timer 40 and back again.

The coupling rod 37 of the lamellae lock is mechanically coupled to the shaft 51 of the switch 60 by means of a cam gear 50. The rotary knob 41 is arranged on this shaft 51 in a rotationally fixed manner. This cam gear 50 has a disk 52 which is arranged in a rotationally fixed manner on the shaft 51 of the switch 60, on which the rotary knob 41 protruding outwards over the housing 13 for switching the fan 10 on and off is also located. The straight coupling rod 37 has a widening with a

gek ri.unnit. en slit 5i>. Tn this slit 5 6 protrudes. with. &idiagr;|(!&Ggr;&igr; ncjcMii lateral play a at the see &igr; be 5 ? ho ( !: s t. i ijer /apt en 5 7 in. The stilled, this

''' hl &igr; t, .' e '! !) (> is. now r; &ogr; ijnl. nifl i'n , d ;i l\ , when" the Ii r (? hk &eegr;&ogr;&rgr; f 4 1 is turned to the position fii f &igr;&pgr;&ugr; e Il., in r ei the drive motor &pgr; r '? I is switched off., then the l' ¹ Knppn I st.anije '3 7 by rl en /op fen 5 7 in a St". el! um

houon 1 i C t"&igr;&eegr; (lor &iacgr; j &igr; ü I amol 1 &agr;&eegr;' i {\ ilo r 1 &ogr; m r\ ! 1 &eegr;&pgr; -

closures T* are in their positions shown in F i tj . ',] , &pgr;&igr;&eegr; a &eegr; de ! &ugr; her 1 &pgr;&rgr;&rgr; e &eegr;<\ e &eegr; A bs &rgr; er &ggr; st, e 1 1 &ugr;&eegr; cj &pgr;&eegr; I) rfj &eegr; ri &eegr;&eegr; , i &eegr; the diesel lamella closure 'i'j Jen LuI passes through.^ !") &iacgr;'&igr;rr; h this &igr; fan 10 is shut off. .

The slot 56 of the disk 52 is designed in such a way that when the rotary knob 11 is turned to a position in which the drive motor 27 is switched on, the pin 57 is then turned to a position in which the coupling rod 37 fully opens the lamella shutter 3J. This slot 56 is designed here in such a way that the shaft 51 of the switch 60 can be turned to two different switched-on positions.

"5 in which the drive motor 27 runs at different speeds and in both views the coupling rod 27 is in the position in which the slatted shutter 33 is fully open due to the design of the switch ⁵⁶ shown. When the rotary knob 41 is manually turned back to the off position in which the associated switch 60 switches off the electric drive motor, the cam gear 50 returns the coupling rod 37 to its position closing the slatted shutter 33 and it remains in this position until the next switch-on.

sch'iltiHM of the drive motor 27.

The activation of the changeover switch for switching between the manually adjustable fan speed and the timer operation is activated by the slider 43. The timer 40 can only be used to switch the drive motor 27 on and off if the rotary knob 41 is in any of its two positions in which the electric drive motor 27 is switched on. The timer 40 can then interrupt and close again the circuit which is closed here and which corresponds to the speed of the drive motor 27 and move the _slats . The shutter 33 is always opened because the rotary knob 41 is in a position in which it has opened the shutter.

^^ By means of the actuating element 43, the drive motor 27 can be switched on and off manually. The timer 40 is then again ineffective externally. However, its time measuring device remains constantly switched on so that it does not fall out of step when the drive motor 27 is switched on and off manually.

As can be seen from the above, the coupling rod 37 does not need to be actuated by a servomotor even when the timer 40 is switched on. In this case, however, the coupling rod 37 is constantly in a position in which the slatted shutter 33 is opened by it.

6079- &igr; -Zi- ::·::,';· · ^;

If &pgr;&igr;&agr;&pgr; wants to provide that closing the louvre shutter 33 is also possible when the fan is switched off by means of the timer 40 and opening the louvre shutter 33 when the motor 2 is switched on again by means of the timer 40, this can be done

hzw. oft /weckmässiq achieve by doing 10

by the timer 10, a servomotor is activated, which serves to rotate the WnI le M. of the switch 60 for the drive motor 27 and which is therefore switched off by the timer 40.

Drive motor 27 the shaft 51 anstn'.t manually mnto-15

automatically turns to the position in which the motor 27 is switched off and the louvre shutter is closed. This actuator is also controlled by the timer so that it switches to the time-programmed

Switch-on times of the motor 2 7 the shaft 51 20

rotates accordingly and opens ^the slatted shutter again.

The mechanical coupling of the coupling rod 37 with the shaft 51 and the rotary knob 41 used to manually rotate it also has the advantage that the opening and closing of the louvre shutter 33 is completely independent of the position of the fan 10 and does not require any electrical current. The

Fan also different than shown in the drawing 30

preferably such that the ceiling 21 of the

Housing 13 is no longer the ceiling, but now forms a vertical side wall of the fan, whereby it can preferably be provided that the guide vanes 22 are designed in such a way or that they are on-35

60/9 1 - 2 2 -

pointing blade grid is replaceable, such that) the air from the air outlet 20 arranged on the side of the housing 13 is directed obliquely upwards b

leading Ri Lh Lung along the adjacent wall over in a direction leading diagonally upwards away from the wall is blown.

If the position of the housing 13 is always like this ^! IO

that the air outlet 20 is located on the ceiling 21, i.e. on the side of the housing 13, then it can also be provided that the louvre closure 33 is not mechanically coupled to the shaft 51, but is designed in such a way that when the drive motor 2 is switched off, i.e. when no air is being conveyed through the air wheel ?9, the louvres 36 automatically pivot into their shut-off positions due to gravity and can only be opened again by the air to be conveyed by the impeller 29. In this case, it can be expediently provided that they are also coupled to one another in a movement-locking manner by the correspondingly shortened coupling rod 37 in order to prevent rattling noises when the drive motor 27 is switched off, whereby the coupling rod 37 is also adapted to the pivoting movement of the louvres 36.

limiting, noise-damping stops can come into play so that even under unfavorable circumstances no rattling noises are caused. The lamella shutter is then opened automatically when the impeller 29 is driven by the inserted

'&bull;lotor 27 delivers air which forces the slats 36 into their open positions.

It may also be possible to provide the coupling rod 37 35

&rgr; · t « ·

6079- 1 - 23 -

by means of a separate, electrically operated actuator for opening and closing the louvre shutter 33, e.g. by means of a 5

electrically heated bimetal spring, an electromagnet or similar. In this case, the electrical circuit can preferably be designed so that this servomotor when the motor 2 7 is switched on

Opening the louvre shutter and at 10

Switching off the motor 27 to close the louvre shutter 33 is activated, e.g. by switching the heating of the mentioned bimetal spring on and off, etc.

The air outlet 20 has an approximately rectangular outline and extends parallel to the long sides of the ceiling 24.

It was often also intended to be practical anit-m-t 20

of the immobile air deflection elements 22 pivoting air deflection elements are to be provided, e.g. slats that can be manually adjusted to the desired angle position in order to adjust the direction of the air discharge.

If necessary, it can also be ensured that the air outlet (A) does not have an air deflection element, but instead has, for example, a decorative grille.

Instead of providing the electrically heated slats 3 4 with heating wires 5, they can also be of other designs, e.g. thin, electrically heated slats extending in the direction of air flow with their widths or even air -directing slats.

Claims (1)

&igr; ·« 6079-1IP-24- Protection claims 1. Fan, preferably wall fan, whose impeller i,i is arranged in a housing having an air inlet and an air outlet, in which downstream of the impeller a louvre shutter is arranged for shutting off the fan, characterized in that downstream of the louvre shutter (33) an electric heater (34) is arranged for heating the air conveyed by the impeller (29). 2. Fan according to claim 1, characterized in that it is a surface-mounted wall fan (10). 3. Fan according to claim 2, characterized in that it has a box-shaped housing and its air outlet (20) serving to blow air into a room to be ventilated is arranged on a preferably approximately flat area of the peripheral wall of _the housing, preferably on the ceiling (24) or on a side wall of the housing. . Fan according to claim 3, characterized in that the air outlet (20) has air deflection elements (22) which allow the air flowing out of it to be directed in a direction which is suitable for the life of the housing having the air outlet and which is provided with a sealing ring (30) for sealing the housing wall and the sealing ring (30) for sealing the housing wall. 6079-1IP-25- are arranged immobile.
5 5. Fan according to one of the preceding claims, characterized in that the fan has at least a pollen filter (32) which is connected to the The air conveyed by the impeller (23) is penetrable . IO &igr; 6. Fan according to claim 5, characterized in j that the pollen filter (32) is a fine filter or Himicrofilter is. 7. Fan according to claim 5 c-dnr 6, characterized in that the pollen filter (32) is an electret filter. 8. Fan according to claim 7, characterized in that ^O the electret filter (32) as a filtering substance Electret fibers, preferably a fiber fleece forming electret fibers. 9. Wall fan according to one of the preceding claims, characterized in that it has a louvre shutter (33) serving to shut it off and that a manually operable switch (60) serving to switch the drive motor (27) of the impeller on and off is arranged on the housing and is mechanically coupled to the louvre shutter (33) in such a way that the louvre shutter is opened by the manual operation of the switch serving to switch the drive motor (27) on and closed by the manual operation of the switch serving to switch the drive motor (27) off. °° this drive motor serving manual actuation ■*■#■» 6079-1IP-26 of the switch is closed. 10. Wall fan according to claim 9, characterized in that the switch (60) is a rotary switch with a manually rotatable actuating member (41), on whose movement-coupled, preferably rotationally fixed connected shaft, a first member (52) of a cam mechanism (50) is arranged in a rotationally fixed manner, which is connected to a second member (57) of the cam mechanism arranged on a coupling rod (37) of the slatted shutter (33) for opening and Closing of the slatted shutter. 11. Wall fan according to claim 10, characterized in that one of the two members of the cam gear is a pin (57) and the other member (52) of this cam gear has a slot (5G) or a curve for guiding the pin. 12. Wall fan according to claim 9, 10 or 11, characterized in that the switch (60) at least has two stages which can be selectively switched on by its actuating element (41), by means of which different speeds of the impeller (29) can be switched on, and that the cam gear (50) is designed ^{in such a way} that the lamella closure (33) remains open when switched on at different speeds. 13. Fan according to one of the preceding claims, gc characterized in that on the fan (10) a 6079-1 IP2 / Timer (40) is arranged, which animates the switching on and off according to the time program. I. ü f I, π rr, rl i π π t . 14. Fan according to one of the preceding claims, characterized in that on the front side of its box-like housing (13) there is provided an opening which can be closed by a cover (45) or a flap and through which at least one filter (3?) arranged in the housing can be replaced. .1 !· . Fan according to one of the preceding claims, characterized in that the impeller (2b) of the- L &igr;;"' L &ogr; is a radial &tgr;-ad, which preferably has a spiral-shaped pressure channel (31) having L e i t vomchtung &zgr;&ugr; g e j r d &eegr; r t is >P 1 i\ f i- &rgr; r nar-h ci-inam rlc=;· w nrharnphpnfjof. A &Pgr; -S ⁿ &Ggr; U ⁿ h 6 characterized in ^that it has a filter at the east and that, in the meantime, one filter (32) or at least one filter (32) is arranged downstream of the impeller (29), preferably between the impeller ('d'.i) and a lamella closure (33). 17. Fan according to one of the preceding claims, 30 characterized in that the electric drive motor (27) driving its impeller (29) is arranged in the housing (13). &bull; ■ ψ · ■ · t 60/9 - 1 IP - To - 18. Fan according to one of the preceding claims, characterized in that the electrical heater (34) has heating wires (35) and/or current is supplied from an air outlet ^of the blade grid.