DE3404004A1 - Air outlet and inlet device for a cooker - Google Patents

Abstract

An air outlet and inlet device for a cooker in a closed space is described, having a vapour extractor hood which is arranged above the cooker and in which an additional fan is arranged which produces a curtain of air which is directed from the vapour extractor hood down to the cooker and shields the kitchen area on the one hand and the space between the cooker and the vapour extractor hood on the other hand from one another. To achieve a powerful curtain of air, even if only little fresh intake air is to be supplied, for example due to the cold prevailing outside, air circulating in the kitchen or filtered exhaust air which is allowed in via an adjustable opening in the air inlet tract can also be used to form the curtain of air.

Description

Exhaust and supply air device for a hotplate

The invention relates to an exhaust and supply air device according to the preamble of claim 1 for a cooking place in an enclosed space.

It is known to work through the extractor hood over the hob extracted exhaust air with fresh air that is let in from the outside, or to be replaced like air circulation by supply air in the form of filtered exhaust air. This will prevents the function of the exhaust fan from being limited to a static To generate pressure difference between interior and exterior, or that - what due recently intensified efforts to isolate encounters increasing difficulties - the air is replaced through leaks and window and door gaps.

It is known (US Pat. No. 3,890,887) that the supply air is used as cooling air in places to blow, on which the kitchen staff has to do work in order to thereby to achieve increased convenience at the same time.

In addition, it is according to the preamble of claim 1 on which it is based Prior art known (DE-OS 22 59 670), along the edge of the extractor hood Arrange rows of nozzles that shield the hob from its surroundings Create air curtain. Here are different flow ways known, for example, the extraction of the air for the air curtain at the top the extractor hood or the extraction of this air from the exhaust air chamber in which the already filtered exhaust air is still under a certain pressure generated by the fan stands. It is also known (DE-OS 19 63 456), the air for the air curtain as fresh air to be supplied from the outside.

While when drawing the air for the air curtain from the kitchen or the air extraction from the exhaust air is hindered by the counterpressure that is created the supply of fresh air from the outside proves to be disadvantageous when the incoming air from outside is very cold and / or only a moderate exhaust air discharge it is asked for. The air curtain can only serve its purpose if one a sufficient amount of air is blown out at sufficient speed, a corresponding one Blower must therefore meet a minimum funding to a sufficiently far after to generate a sealing air curtain reaching below. If this air curtain is used in the Winter creates a lot of cold outside air, this results in undesirable cooling of the room and also due to the humidity of the exhaust air from the cooking process considerable condensation with fog formation and moisture.

On the other hand, if the exhaust air delivery rate is only weak, it should also a strong air flow create the air curtain in order to provide adequate shielding to lead, especially if there are no further adequate means of air escape are present, lead to problems with the balance between extract air and supply air got to.

The invention is based on the object of an exhaust and supply air device to create with an extractor hood that can be used universally, including one strong air curtain is allowed with moderate air extraction or with cold outside air.

This object is achieved by the invention characterized in claim 1 solved. Accordingly, room air or filtered exhaust air can be added to the supply air, which then as an air curtain is expelled and to some extent circulates in the room and via the supply air compression in the air curtain. This in Circulating air that is essentially at room temperature can then be mixed with a correspondingly smaller proportion of the fresh supply air are mixed, so that even with a sufficiently effective air curtain can be created can. If no fresh air duct is connected and all the air comes for the Air curtain from the exhaust air, this can be done by adjusting the flow cross-section affect the ratio of exhaust air and circulated supply air. Here the Extractor hoods with closed connection pieces can also be designed so that the entire filtered exhaust air flow again via the nozzle device as an air curtain is blown out and the extractor hood without any external air connection is an autonomous one Component represents.

The adjustment of the throughput cross section can be done with a construction according to claim 3 with the help of a switch, for example outside of the Extractor hood is arranged in the course of the fresh air duct. Alternatively can a corresponding switch or flap is also arranged within the hood housing be. According to claim 4, the exhaust air to the nozzle device is at least in the return circuit a filter is provided, e.g. in the area of the exhaust air outlet and / or in the area is arranged between the exhaust air chamber and the supply air chamber.

It is expediently an easily replaceable one, for example Cartridge-shaped activated carbon filter and a self-washable grease filter.

The measures according to claims 6 and 7 relating to the control the air mixture, wherein according to claim 8 also a Lufthei zvorrichtung, for example a heating grille, with the help of which a thermostatic air temperature control is available is feasible. By choosing the temperature measurement location, for example in the area of the cold Fresh air or the already mixed supply air, different rules can be set determine the characteristics.

Regarding temperature and air flow control are appropriate the corresponding indicators and adjusting devices on the front of the air extractor hood attached and with remote control connections with the appropriate measuring devices or

Fittings connected, which can thus be relocated inaccessible. Intended to only a single temperature display should be installed, so this preferably shows the Temperature of the already mixed supply air flow.

The measures according to claims 10 and 11 relate to an appropriate one Hood construction with a maintenance-friendly slide-in system and an adjustable one Flap inside the hood, making it easier and more robust inside the Standard dimensions representable construction results.

Further details, advantages and developments of the invention result can be derived from the following description of preferred exemplary embodiments with reference on the drawing. They show: FIG. 1 a schematic representation of an overall installation an exhaust and supply air device according to the invention in a kitchen; Figure 2 a Vertical section through an extractor hood used in the device according to FIG. 1; Figure 3 is a plan view of, or, in part, a horizontal section through the Extractor hood according to FIG. 2; FIG. 4 shows a switch used in FIG. 1; Figure 5 an exchangeable front panel of the extractor hood in front view and top view the installation of Figure 1; Figure 6 is a front view of a modified extractor hood with partly with broken parts.

Figures 7 to 11 sectional views in planes 7-7 to 11-11 through the Extractor hood according to Figure 6; Figure 12 is a plan view of the extractor hood according to Figure 6; FIG. 13 shows a view from below of the extractor hood according to FIG. 6.

One used in the course of the exhaust and supply air device according to FIG. 1 Extractor hood 1 according to FIGS. 2 and 3 has an exhaust air chamber 2 and an inlet air chamber 3 on. In the usual way, a fan 4 draws kitchen exhaust air through a filter 5 in the exhaust air chamber 2 and pushes it through an exhaust air exhaust duct 6 into the open or, if it is a circulating air system, again through an air purification station back to the kitchen room. Via a supply air supply channel 7, the supply chamber 3 is which the exhaust chamber 2 in the example described essentially above and at three Surrounds sides, connected to a source of fresh air. The extractor hood 1 is also in the usual way with a lamp 8 to illuminate the hob and Provided with a removable, inserted control panel 9 on the front.

Cross-flow fans are used to expel the fresh air from the supply air chamber 3 11, in the example described, three cross-flow fans, the, in plan seen, are laid along the edges of the extractor hood 1 (Fig. 3). These Cross-flow fans each generate a slot nozzle 12 parallel thereto Part of an air curtain 13. The extractor hood 1 produces three air curtain strips, an approximately cuboid space area lying under the extractor hood 1 limit on three sides, while the fourth side is limited by the kitchen wall will.

To equalize the supply air output over the entire fan width If necessary, 3 air baffles can be arranged in the supply air chamber.

A total of one serves to drive the rollers of the cross-flow fan 11 Motor 14 attached to one end of one of the cross-flow fans 11 attacks. The other cross-flow fans, which each meet at right angles, are Connected via bevel pinion 15, so that the motor 14 has the ttotorkraft for all three cross-flow fan 11 applies. Alternatively, the individual cross-flow fans could also be used 11 each be driven by their own motors, which can then be individually smaller. In this case, the positions of the cross-flow fans can be independent of one another for example, can also be selected in different levels.

The nozzles 12 are about an axis, which in the example described with the axis of the respective cross-flow fan 11 coincides, rotatable, so that the opening angle of the respective air curtain strip can also be selected. The vote the angle of the slot nozzle 12 can either be when installing the lifting and lifting device be hit and fixed or can be left to the user on a case-by-case basis will.

Fig. 1 shows the overall device with the extractor hood 1, the Air ducts 6 and 7, the cross-flow fans 11 and the air curtain 13. The extractor hood 1 is located above a hotplate 21, of which with vapors, acrolein and others Ingredients enriched exhaust air 22 rises. The exhaust air 22 can with the help of the Fan 4 (Fig. 2) through the exhaust air extraction duct 6 and a duct branch 6 'to the outside be transported.

A per se serves for the passage of the channels through an outer wall 23 known supply and exhaust air wall box 24 (DE-GM 81 02 551).

The air supply duct can be placed above the wall box and a duct branch 7 ' 7 can be fed with fresh air from the outside. This fresh air is supplied by the cross-flow fans 11 ejected as the air curtain 13. This air curtain surrounds the cooking area 21 rising exhaust air 22 along three mutually approximately rectangular surfaces, while no air curtain is created on the wall in the background. At a Furniture installation, in which between the extractor hood 1 and the hob 21 on a or there are wall units on both sides, for example, can be attached to these Sides of the cuboid the space between the extractor hood 1 and the hotplate 21 also do not have the cross-flow fan, since there is no air curtain is required. The air curtain blown downwards on three sides surrounds So the room with the rising exhaust air and shields the environment from this Exhaust air.

In addition, the supply air blown in in the form of an air curtain complements the extracted air Exhaust air 22 by moving from the inside of the air curtain 13 between the extractor hood 1 and the level of the hotplate 21, air is continuously withdrawn, deflected and to the exhaust air is added until finally when it hits the level of the hotplate 21 the main part of the remaining downwardly directed supply air to the hob 21 is deflected to and mixes there with the vapors given off by the food, to then be sucked up and pulled off.

In this described manner the shielding is optimal, however can already be an advantage if the air curtain 13 is not up to Level of the hotplate 21 reaches down, but due to lower fan power the supply air can be diverted to the center beforehand and drawn off with the exhaust air will. Because, according to the prior art, a large part of the vapor that is drawn off into the room escapes at the edge of the extractor hood, in such a case at least this one Detected exhaust air from the air curtain 13 and back to the center of the screened room spun back. The control of the thickness of the air curtain, i.e. the supply air flow rate, In any case, it has a certain importance.

The exhaust air extraction duct 6 is divided by a branch switch 28 in the duct branch 6 'leading to the supply and exhaust air wall box 24 and one via a Filter 29 in turn into the kitchen area feeding duct branch 6 ″. In addition, the Supply air supply channel 7 with two supply air inlets converging through a switch 30 provided, namely via the channel branch 7 'with the wall box 24 for the suction of the fresh air portion and through a channel branch 7 ″ and with a filter 31 the air is sucked in from the kitchen area. The switches 28 and 30 are respectively adjusted by a remote-controlled servomotor, namely the switch 28 by a motor 32 and the switch 30 by a motor 33. When described For example, the turnouts are included in the channels, but they can also be included in the Be integrated into the extractor hood, as will be described later with reference to FIGS. 6 to 13 will.

If you have to reckon with relatively cold outside air, you can With the help of the switch 28, for a given air extraction, select how much exhaust air to the outside is blown and therefore has to be replaced from the outside, and how much exhaust air is filtered is returned to the kitchen.

The switch 30 makes it possible to replace even if only a little exhaust air and insofar as only a little cold outside air should be sucked in, it should be one to produce very powerful air curtain 13. This powerful air curtain is necessary to shield the space above the hotplate 21. A greater or lesser proportion the supply air forming the air curtain 13 thus consists of circulating air that is in the kitchen area and circulates in the supply air supply duct 7. The shielding effect can thus also under moderate supply of fresh air can be achieved, the air curtain 13 forming The supply air is preheated by the circulating air to such an extent that considerable mist is formed, Condensation of water on the hotplate 21 or even icing on the extractor hood 1 should be avoided.

FIG. 4 shows an example of the switch 30, with one that can be adjusted by the motor 33 Control flap 34. The chock in question points to universal installation Round and flat duct connections, which can either be kept closed or connected to Channel pieces can be connected.

The one detachably attached to the extractor hood 1 or elsewhere Control panel 9 to be arranged to control the exhaust and supply air device according to Fig. 1 is illustrated in FIG. 5. In the usual way it has an on and off switch 41, a switch 42 for exhaust air without supply air, a switch 43 for circulating air, filter displays 44, which indicate whether the filter is being renewed is in need of care, and Light switch 45 on. Furthermore, the panel has a switch 46 for closing or Switching off an admixture of circulating air to the supply air and an automatic switch 47 for Switching on or off an automatic temperature control of the air temperature of the air curtain 13, furthermore a clock automatic timer 48 and a supply air setting switch 49. A supply air setting 50 is used for regulated or controlled setting the temperature of the supply air blown into the kitchen due to the setting of the switch 30, for which the basis is on a supply air temperature display 51 and on a room temperature display ge 52 readable air temperatures. An air circulation display 53, due to the current fan output or based on actual flow measurements at least approximately indicates the air throughput of exhaust air and / or supply air an idea of the effectiveness of the vent. A four-stage switch is used the choice of engine power.

This universally applicable panel enables optimal use the exhaust and supply air device according to the invention.

6 to 13 show an extractor hood in which the adjustable Opening is built in directly. This extractor hood, labeled 1 ', has in turn, an exhaust air chamber 2 and an air intake chamber 3, which, however, are divided into several Partial chambers are divided, an exhaust fan 4 and a supply fan 4 ', which as Centrifugal centrifugal compressors that deliver from the inside to the outside according to their direction of rotation are formed, furthermore the nozzle for the exhaust air extraction duct 6 and the supply air supply duct 7, the light 8 behind glass, the control panel 9 and the slot nozzle 12, which also can be replaced by a series of punctiform nozzles.

In its lower part, the extractor hood 1 'is an actual one Widened hood part 57, on which a somewhat narrower device structure 58 rests, at the top the nozzle for the exhaust air extraction duct 6 and the supply air supply duct 7 are formed. The actual main part 57 has one to the underside of the hood housing open extractor bell space 59 (Fig. 13), the to an exhaust vent 60 converges to which, in turn, the exhaust fan 4 with a centrally located therein Motor 61 connects. The exhaust fan 4 pushes the exhaust air into the exhaust air chamber 2, which consists of two parts, namely a chamber part 2 'in the form of a substantially horizontally extended compartment in which the fan 4 including his Motor sits and that the lowest area of the device structure 58, immediately afterwards on the actual hood part 57, and from a chamber part 2 ″, which is like a chimney from the chamber part 2 'to the socket of the exhaust air duct 6 and the plan in plan Area of a corner of the device structure 58 occupies.

The slot nozzle 9 is located in the actual hood part 57, Channels not visible in the drawing are connected to the supply air chamber 3. These Supply air chamber consists of a first chamber part 3 'in the form of a substantially horizontally extended compartment that connects to the nozzle of the air supply duct 7, furthermore from a chamber part 3 ″, in which the supply air fan 4 'including its centrally housed motor 62 is located in the central area of the fan communicates with the chamber 3 ', furthermore a chamber 3' '', which is also again in the form of a horizontal compartment below the chamber 3 "and with communicated to the area outside the fan 4 'via openings 68, 3 iv as well as a chamber part 3 in the form of a downward chimney, which is connected to the chamber part 3 '' 'communicates and the chamber part 2' of the exhaust air chamber passes through (Fig. 11) Kam-3 mteil 3 in takes, as can be seen from FIGS. 7 and 8, as well as the Chamber part 2 ″ a corner of the device structure 58 in plan, in this plan So one of the narrow sides is divided into the chamber parts 2 "and 3 IV, and part 2 "takes about two thirds and part 3 tv one third of the edge length in claim. Most of the footprint of the device assembly 58 is occupied by the three superimposed, essentially equal-area chamber parts 3 ', 3 ", 3"' and most of the chamber part 2 ', which without a partition in the chamber part 2 " passes over, used.

The conveying direction of the fan 4 'could also be radially outward be provided inside, in this case the communication between the chamber parts would be 3 ', 3 "and 3111 vice versa. The chamber part 3"' could be shown in the Execution also essentially omitted; but this chamber part 3 '' 'is also used the supply air duct also as a cable space for the energy supply of the motors 61 and 62.

The chamber parts 3, 1, 3 ", 3" 'and 2' are separated by partitions 63, 64 and 65 separated9 which can be pushed into the device structure 58 like a drawer and for the purpose of Maintenance and repair can be easily pulled out. The partition wall 64 carries the fan 4 'with its motor 62 and the partition wall 65 carries the fan 4 with its motor 61. The chamber part 3 iv also serves as a cable duct for the Power cables laid to operate the individual main components.

Rails 66 are located at the lower edge of the siphon bell space 59 for hanging a filter. At the upper edge of the actual hood part 57 are Hanging rails 67 attached, the installation of the extractor hood 1 'for example serve in a furniture wall.

Between the chamber part 2 "on the one hand and the chamber part 3 'on the other hand an opening 71 is formed in the corresponding vertical partition wall which extends through a flap 72 can be closed or opened to a desired opening width can be. The opening or the choice of the angle of attack of the flap 72, which A Bowden cable 73 serves as a deflector plate in the flow path of the exhaust air, on the one hand on a lever firmly connected to the hinge axis of the flap 72 74 is connected and, on the other hand, to an adjusting slide 75 on the control panel 9 the hood 1 'attacks. The lever 74 as well as the upper part of the Bowden cable 73 is located in chamber part iv of the supply air chamber 3. By adjusting the flap opening angle the flap 72 can a larger or smaller part of the filtered exhaust air in the Chamber part 3 'of the supply air chamber 3 is sucked and this supply air to form the air curtain again be added. By closing the nozzle for the Exhaust air extraction duct 6 and the supply air supply duct 7 can also be completely closed Extractor hood can be created with an air curtain. With the appropriate modification it is possible then in addition to the filter sheet that can be suspended in the rails 66 another filter, in particular a replaceable activated carbon filter cartridge, to be used, in particular in the chamber part 2 ".

At the supply air nozzle for the supply air supply duct 7, i.e. at the supply air inlet in the chamber part 3 'there is a non-return valve 78, which is described in Example according to FIG. 8 in the form of two semicircular flaps, which by spring pressure are biased to the closed position is formed. The check valve 78 prevents the filtered through the opening 71 in the chamber part 3 ' Exhaust air, especially when the fan 4 'is at a standstill, via the fresh air duct migrates outside, and also throttles the intake of supply air via the supply air supply duct 7 in such a way that the fan 4 'actually also passes through the opening 71 accordingly the flap setting sucks in filtered exhaust air from the chamber part 2 ". A corresponding one Throttling or a closure of the channel 7 could also be done manually or remotely adjustable flap.

The extractor hood 11 according to FIGS. 6 to 13 can also have the installation according to Fig. 1 are provided, whereby still further variation possibilities can be achieved for the desired flow conditions.

Claims (12)

Exhaust and supply air device for a cooking zone Patent claims 1. Exhaust and supply air device for a hotplate (21) in a closed room with an extractor hood (1, 1 ') in the form of a bottom to be arranged above the hob open housing, the inside an exhaust vent (60), which in jine an an air vent (6) connectable exhaust air chamber (2) opens into the exhaust air from the open underside of the housing through the vent opening (4) and a downwards running along the lower edge of the extractor hood elongated nozzle device (12), which is located in the extractor hood with a The air inlet chamber (3) communicates and the space between the hob and at least partially surrounding the open housing underside of the extractor hood Air curtain (13) generated, wherein the air inlet chamber (3) with an air inlet opening (7 ", 30; 71) communicates with the surrounding space and the exhaust air chamber (2) connects, characterized in that the with the surrounding space or the Opening (7 ″, 30; 71) connecting the exhaust air chamber (2) in its throughput cross section is adjustable. 2. Exhaust and supply air device according to claim 1, characterized in that that the supply air chamber (3) continues with a Fresh air duct (71) is in communication, the air from an area outside the enclosed space can lead. 3. Exhaust and supply air device according to claim 2, characterized in that that the adjustability of the throughput cross-section of the opening (7 ", 30; 71) at or in front of the entrance to the supply air chamber (3) a switch (30) with a selectable mixing ratio is located, of which an inlet opening with that of the room or the exhaust air chamber communicating opening (at 7 ") and the other connected to the fresh air duct (7 ') is. 4. Exhaust and supply air device according to one of claims 1 to 3, characterized characterized in that in a flow channel containing the opening (7 ", 30; 71) an air filter (31; at 66) is located. 5. Exhaust and supply air device according to claim 4, characterized in that that the opening (71) and the air filter (at 66) are within the housing and the supply air chamber (3) as well as the exhaust air chamber (2) in the direction of the air vent (6) and can optionally be locked to the fresh air duct (7). 6. Exhaust and supply air device according to one of claims 1 to 5, characterized characterized in that there are flow meters in the various flow branches are located and on the extractor hood (1) outside a display device (53) for the measurement results are located. 7. Exhaust and supply air device according to one of claims 1 to 6, characterized characterized in that there are temperature measuring devices in the various flow branches are located and on the outside of the extractor hood a display device (51) for the Measurement results is located. 8. Exhaust and supply air device according to claim 2 or one of the on Claim 2 referring back claims 3 to 7, characterized in that in A flow of air from the fresh air duct (7) to the nozzle device (12) is an air heating device is located. 9. Exhaust and supply air device according to the referring back to claim 7 Claim 8, characterized by a thermostatic heating control ung. 10. Exhaust and supply air device according to claim 2 or one of the claims 2 related claims 3 to 9, characterized in that in the flow from the fresh air duct (7) to the nozzle device (12) a shutter and / or a check valve (78) is located. 11. Exhaust and supply air device according to one of claims 1 to 10, characterized characterized in that the exhaust air chamber (2) and the supply air chamber (3) in chamber parts (2 ', 2 "; 3', 3", 31 ", iv 31) are divided, the partition walls (63, 64, 65) at least some carry fittings and can be pulled out like drawers. 12. Exhaust and supply air device according to claim 11, characterized in that that the opening (71) in the partition between a behind the exhaust fan (4) located exhaust air chamber part (2 ") and one located in front of the supply air fan (4 ') Supply air chamber part (3 ') is located and is adjustable by a flap (72) whose Adjustment using a handle (75) on the outside of the extractor hood (1 ') was actuated (via 73).