AIR-DISTRIBUTION CAP FOR A CONVECTOR

Abstract: The present invention relates to an air-distribution cap which is to be fitted on top of a heating or air-conditioning unit with natural or forced convection and the function of which is to regulate both the flow-rate and the direction of the air output by the convector. In particular, the present invention relates to a cap (1) for distributing the air output by a heating or air-conditioning unit with forced convection or with natural convection, characterized in that it comprises a deflector (3, 103) having one or more vanes (13, 113), each vane being orientable so as to adopt a position in which it is inclined to the vertical so that its outer end faces towards the wall against which the unit is fitted.

Description: AIR-DISTRIBUTION CAP FOR A CONVECTOR DESCRIPTION The present invention relates to an air- distribution cap which is to be fitted on top of a heating or air-conditioning unit with natural or forced convection and the function of which is to regulate both the flow-rate and the direction of the air output by the convecto . Heating units normally used for domestic or office heating comprise a finned heat-exchanger with a pipe- coil for the circulation of hot water - connected to the heating system of the habitable unit - and a housing with openings at the bottom and at the top for promoting the circulation of air into the unit and through the finned exchanger. There are two types of such heating units: units with natural convection and units with forced convection (fan convectors) . In fan convectors, a fan is disposed beneath the finned exchanger and creates forced air convection extremely efficiently. In natural-convection units, on the other hand, the air-flow is caused by movements present in the fluid mass owing to disequilibria of forces caused by the heat-transmission process. When the exchanger is supplied with hot water, convection is initiated owing to the pressure difference existing between the column of still, cold air outside the convector and the column of hot air present inside the convector, so that a true chimney effect is created. It is also known to cover conventional thermosiphonic heaters or radiators with suitable housings both to improve their appearance and to prevent dispersal of heat in directions which are not useful from the point of view of the habitability of the room. For this purpose, the housings or cabinets have front grills which enable the hot air-flow to be directed towards the centre of the room, thus minimizing dispersal and making best use of the heat supplied by the thermosiphonic heater or radiator. A disadvantage of this solution, which is particularly clear when the heating unit is placed beneath a window, is that the hot air-flow, which is directed forwards, cannot substantially strike the surface of the window. When the window is misted over - which normally occurs when the humidity inside the dwelling is very high and/or the outside temperature is low - a heating unit such as that described above cannot therefore demist the glass. A first problem underlying the present invention is therefore that of providing a distribution device which can be fitted on thermosiphonic heaters, radiators, or heating or air-conditioning units with natural convection or with forced convection and which does not have the disadvantages discussed above. A further problem towards which the present invention is directed is that relating to the need to regulate the heating power delivered by the heating unit at will, in dependence on specific environmental requirements. This operation which, in the case of fan convectors, is performed simply by switching the fan on or off, can be achieved with thermosiphonic heaters, with radiators, or with natural-convection units, only by intermittent operation of the thermosiphonic circulation of hot water. A third problem addressed by the present invention is that of providing a device characterized by considerable constructional simplicity and versatility of use. The problems set out above are overcome by an air- distribution cap as defined in the appended claims. Further characteristics and advantages of the air- distribution cap of the present invention will become clearer from the description of some preferred embodiments given by way of non-limiting example below with reference to the appended drawings, in which: Figure 1 is a perspective view of the air- distribution cap according to the present invention, Figure 2 is a side view showing the cap of Figure 1 in section, Figure 3 is a side view showing, in section, a natural-convection heating unit comprising the distribution cap according to the present invention, Figure 4 is a side view of the deflector of the cap according to a second embodiment of the invention, and Figure 5 is a side view showing, in section, a detail of the heating or air-conditioning unit according to a possible application of the deflector of Figure 4. The air-distribution cap according to the present invention will now be described with reference to the appended drawings . As shown in Figure 1, the distribution cap, generally indicated 1, comprises a frame 2 which supports a deflector 3 in a pivotable manner . The frame 2 is open at the bottom and comprises, at the top, a rear portion 4 which is intended to face the wall on which the heating unit is mounted, and a front portion 5 having a substantially rectangular opening 6 which houses the deflector 3. Inside the opening 6 in the frame 2 there is a plurality of parallel fins 7 lying in planes perpendicular to the longitudinal axis of the distribution cap 1. The fins 7, the function of which is to direct the hot air output by the convector, are fixed by known fixing means (such as, for example, a male-and- female screw system, as shown in Figure 2) to the inner side of the front wall 8 of the frame 2 and project therefrom, towards the interior of the opening 6, approximately as far as its centreline. Alternatively, the fins 7 are articulated for pivoting on the front wall 8 so as to be orientable. In this case, a suitable conventional electrical or manual control will provide for the movement of the fins. The fins 7, which have a substantially irregular polygonal shape, have corners 7' - formed by the inner side 16 and the upper side 17 of the fin - which are greatly rounded. For a natural-convection heating unit the set of fins 7 will advantageously not be provided inside the device since, with the low speeds which are reached by the air in the output opening, it is difficult to orient its flow horizontally; their presence could therefore cause an excessive loss of pressure of the hot air output by the convector. The front portion 5 of the frame 2 houses a control panel 9 of the heating unit, operatively connected in known and conventional manner to an electrical actuator 10 which brings about the pivoting movement of the deflector 3 and, in the case of a fan convector, to the fan which activates the forced convection of the hot air. In an alternative and less expensive embodiment, the electrical actuator 10 is replaced by a manual actuator (not shown in the drawings) such as, for example, a conventional wheel for controlling the deflector 3. In a further embodiment, the opening and the closure of the deflector can be achieved, again manually, by acting on it directly and thus without the need to provide a control wheel . As shown in Figure 2, the front portion 5 and the rear portion 4 of the frame 2 are separated by a panel 11. Through-holes 12 are formed in the rear portion 4 of the frame 2 for housing means (in particular a screw) for the fixing of the device of the invention to the top of a convector housing. In other embodiments, the holes 12 may be replaced by other known fixing means such as, for example, means for sna -engagement on the convector housing. As shown in Figure 2, the deflector 3 comprises a vane 13 of a shape and size substantially corresponding to those of the opening 6 so that it blocks this opening when the deflector is in the closed position. One or more flat projections 14 are disposed on the lower surface of the vane 13. These projections 14, which lie in planes perpendicular to the longitudinal axis of the deflector 3 , are articulated for pivoting on the inner side walls of the opening 6 and/or on one or more fins 7. For a deflector with a high length/width ratio, the articulation of the deflector to a fin or fins is to be recommended, as reinforcement. Naturally, in this case, the fin 7 to which the deflector is connected, will not be orientable . The electrical actuator 10 (for example, a stepper motor) or a manual actuator as described above, is connected in known manner - for example by means of a transmission shaft - to one of the articulation points 15, preferably to an end articulation, so that the pivoting of the deflector can be controlled from the exterior. The point 15 at which a projection 14 is articulated to a fin 7 is disposed in the vicinity of the rounded corner 7' of the fin. Interference does not therefore take place between the vane 13 and the fins 7 when the deflector 3 pivots about the articulation. The deflector 3 is in fact shown in the fully open position in broken outline in Figure 2. In this position, the vane 13 is in abutment with the inner side 16 of the fin, which thus acts as a stop. Figure 3 shows the air-distribution device according to the invention mounted on a natural- convection heating unit 18. This heating unit or convector comprises a housing 19 which is open or partially open at the bottom so that cold air can enter from the surrounding environment. The housing 19 houses a heat exchanger 20 shown schematically in the drawing. The exchanger 20, which is wholly conventional, will comprise a pipe-coil which is connected in a recirculation arrangement to the heating system of the dwelling, and the tubing of which extends through a series of perforated fins, the whole constituting a so- called finned assembly the function of which is to promote thermal exchange. Suitable valves or systems may also be provided for the operation and control of the flow of heating water. Alternatively, the exchanger 20 will be a normal thermosiphonic exchanger or radiator, for example, of the cast-iron, steel or aluminium type. The housing 19 will also comprise one or more seats 21 for means for fixing the unit to the wall, and/or feet 22. The feet 22 may have dimensions such as to conceal any water-supply pipes which may reach the unit through the floor. Clearly, however, the base of the housing must be raised from the floor to allow air to circulate into the convector. As shown in Figure 3, in this embodiment, the distribution cap 1 does not have the fins 7 so as not to cause a drop in the flow-rate of the air output. The deflector 3 will therefore be articulated, solely at its two ends, to the cap itself. In the embodiment shown in Figures 4 and 5, the vane 113 of the deflector 103 is shaped like a roof with two slightly inclined pitches 113", 113". The angle formed between the two pitches will be preferably about 168°. This particular shape allows the hot air output by the convector to be directed better, as will be described further below. Two pins 123 (only one of which is shown, the other being positioned correspondingly on the opposite side) project from the side edges of one of the two pitches 113 ' and are intended to be housed for pivoting in respective seats disposed on the side walls of the opening 6. These pins 123 constitute the articulation points of the deflector 103. The pins 123 are preferably positioned approximately one third of the distance across the width of the pitch 113 ' f om the ridge line between the two pitches. As shown in Figure 5, the deflector 103 may also be mounted directly on the upper edges of the housing of the heating or air- conditioning unit. These edges of the housing must therefore be suitably shaped as shown in the drawing and the holes for housing the pins 123 will be formed in their side walls. The air-distribution cap according to the present invention may be made either of metal or of plastics material. This latter material is particularly advantageous in terms of the cost of the device. The operation of the air-distribution cap according to the present invention will now be described, again with reference to the drawings . As stated above, the cap 1 may be mounted, for example, by means of a male-and-female screw system, on the top of the housing of a heating unit with forced convection or with natural convection, of which the latter may be in the form of a cabinet housing a conventional thermosiphonic heater or radiator. The cap 1 of the invention will therefore be mounted in place of the closure top of this unit. For natural-convection units, the distribution cap will preferably be of the type without fins 7. The deflector 3, 103 is pivoted about its articulation to the desired extent of opening by an electrical control acting on the electrical actuator 10 or by a manual control. With manual operation, the deflector is held in the stopping position by known stop means or by suitable counterweights . These devices are widely known to a person skilled in the art and will not therefore be described in greater detail . With an electrical actuator, the desired position will be maintained by the actuator itself (for example, by the stepper motor) . The deflector can pivot to a position in which, having passed through the vertical position, it is slightly inclined with its outer end facing towards the wall against which the convector is fitted. In a cap 1 with fins, the fact that the inner side 16 of the fin 7 is slightly inclined, that is, that the angle formed between that side and the upper side 17 is less than 90°, means that the vane 13 can adopt the above- described position in which it is inclined to the vertical . By virtue of the particular orientability of the above-described vane, some of the air output from the heating unit is directed towards the wall and hence towards any window disposed above it, as indicated by the arrows in Figures 2 and 3. If the cap 1 has the deflector 113 with the roof-shaped vane, it can easily be seen that the air output is directed towards the wall by the first pitch 113' whereas the second pitch 113" favours a fan-shaped opening for the air-flow which thus creates a thicker cushion of hot air in the vicinity of the window disposed above it. The deflector 3, 103 can be adjusted to any position between the fully-closed position and the fully-open position which, naturally, will be the preferred position when it is necessary to demist the glass of any window disposed above the heater or in any case to obtain the maximum heating power of the unit . If the room is overheated, however, the deflector can be fully closed to as to block the air-outlet opening 6. The advantages of the air-distribution cap according to the present invention are clear from the foregoing description. In the first place, the cap 1 constitutes an accessory which can easily be fitted on convectors with forced or natural convection, for example, on already- installed conventional thermosiphonic heaters or radiators . Moreover, its constructional simplicity which is due, in particular, to the presence of a single vane 13, 113 in the deflector, is reflected in a low cost which renders the distribution cap according to the invention also advantageous for use in the least expensive heating units . A substantial advantage of the cap according to the present invention is that the deflector 3, 103 can be oriented so as to adopt an inclined position facing towards the wall and any window disposed above it so as to direct the hot-air flow towards glass misted over by water vapour and to promote quick and efficient demisting thereof. With the air-distribution cap according to the present invention, effective adjustment of the amount of air output from the convector and hence accurate regulation of the heating power of the heating unit are achieved. This is particularly advantageous in natural- convection units, particularly in conventional thermosiphonic systems in which heat regulation is normally achieved by interrupting the thermosiphonic circulation of the hot water, with the risk of the creation of air bubbles in the system. With the device of the invention, however, the heating of the room can be interrupted at will simply by adjusting the deflector to the closed position. Naturally only some specific embodiments of the air-distribution cap according to the present invention have been described, but a person skilled in the art may apply thereto all modifications necessary for their adaptation to particular applications without, however, departing from the scope of protection of the present invention. For example, the opening and the closure of the deflector 3, 103 may be brought about automatically by means of a central control unit connected to a thermostat adjusted to a predetermined temperature. An example of automatic regulation by means of a thermostat is that defined in the European patent application which was published under the No. EP 0 837 288 on 22nd April 1998 in the name of the applicant of the present patent application and the description of which is incorporated herein by reference. Moreover, the cap 1 may also be adapted to air- conditioning units or to units operating both as coolers and as heaters . The heating unit with the air-distribution cap according to the present invention may also be mounted on the ceiling. In this case, the use of a deflector 103 with a roof-shaped vane 113 will enable the air to be directed better towards the interior of the room. Naturally, although the above-described embodiment with a single vane is the preferred embodiment of the present invention, the deflector 3, 103 may also comprise two or more vanes .

Claims: CLAIMS 1. A cap (1) for distributing the air output by a heating or air-conditioning unit with forced convection or with natural convection, characterized in that it comprises a deflector (3, 103) having one or more vanes (13, 113), each vane being orientable so as to adopt a position in which it is inclined to the vertical so that its outer end faces towards the wall against which the unit is fitted. 2. A cap according to Claim 1 in which the deflector (3, 103) comprises a single vane (13, 113). 3. A cap according to Claim 1 or Claim 2 in which the deflector (3, 103) can be oriented manually. 4. A cap according to Claim 1 or Claim 2 in which the deflector (3, 103) can be oriented by means of an electrical actuator (10) operated by a suitable control. 5. A cap according to any one of Claims 1 to 4 , the cap being fixable to the top of the housing (19) of a heating or air-conditioning unit by suitable fixing means . 6. A cap according to Claim 5 in which the fixing means are a male-and-female screw system (12) or snap- engagement means . 7. A cap according to any one of Claims 1 to 6 , comprising a frame (2) which supports a deflector (3, 103) in a pivotable manner, the frame (2) being open at the bottom and comprising at the top a rear portion (4) which is intended to face towards the wall against which the unit is fitted, and a front portion (5) having a substantially rectangular opening which houses the deflector (3, 103) . 8. A cap according to Claim 7 in which a plurality of parallel fins (7) lying in planes perpendicular to the longitudinal axis of the distribution cap (1) is disposed inside the opening (6) in the frame (2) . 9. A cap according to Claim 8 in which the fins (7) are orientable. 10. A cap according to any one of Claims 1 to 9 in which the deflector (3, 103) comprises a vane (13, 113) of a shape and size substantially corresponding to those of the opening (6) so that it blocks the opening when the deflector is in the closed position. 11. A cap according to Claim 10 in which two or more flat projections (14) lying in planes perpendicular to the longitudinal axis of the deflector (3) are disposed on the lower surface of the vane (13) , the flat projections (14) being articulated in a pivotable manner on the inner side walls of the opening (6) and/or on one or more fins (7) . 12. A cap according to any one of Claims 1 to 10 in which the vane (113) of the deflector (103) is roof- shaped with two slightly inclined pitches (113 ', 113") . 13. A cap according to Claim 12 in which the angle formed between the pitches (113', 113") is approximately 168°. 14. A cap according to Claim 12 or Claim 13 in which two pins (123) project from the side edges of one of the two pitches (113') and are intended to be housed in a pivotable manner in respective seats disposed on the side walls of the opening (6) . 15. A cap according to Claim 14 in which the pins (123) are positioned approximately one third of the distance across the width of the pitch (113') from the ridge line between the two pitches. 16. A cap according to any one of Claims 12 to 15 in which the vane (113) is mounted directly on the upper edges of the housing of the heating or air-conditioning unit, the pins (123) being inserted in corresponding holes formed in the side walls of the housing. 17. A cap according to any one of Claims 1 to 16 in which the air-distribution cap (1) is made of plastics material . 18. A heating or air-conditioning unit with forced convection or with natural convection comprising an air- distribution cap (1) according to any one of Claims 1 to 17 . 19. A heating or air-conditioning unit according to Claim 18, the unit being capable of being fitted on a wall. 20. A heating or air-conditioning unit according to Claim 18 or Claim 19 in which the opening and the closure of the deflector (3, 103) are brought about automatically by means of a central control unit connected to a thermostat . 21. A heating or air-conditioning unit according to any one of Claims 18 to 20, the unit being fixable to a ceiling.

Inventors: RIELLO VALERIO GIORDANO, RIELLO, VALERIO, GIORDANO
Applicants: AERMEC S P A, RIELLO VALERIO GIORDANO, AERMEC S.P.A., RIELLO, VALERIO, GIORDANO
Application year: 2001
Main classification: F24F13
IPC codes: F24F1, F24F3, F24F13