WO1986006153A1

WO1986006153A1 - Gas stove, especially for caravans

Info

Publication number: WO1986006153A1
Application number: PCT/EP1986/000229
Authority: WO
Inventors: Eduard Muellenbruch
Original assignee: Electrolux Siegen Gmbh
Priority date: 1985-04-17
Filing date: 1986-04-17
Publication date: 1986-10-23
Also published as: EP0219546A1

Abstract

A gas stove, especially for caravans, with at least one jet-type burner in the form of a perforated burner plate (1) covered by a heat transmission plate (2), which can be fed with gas (6) and combustion air (12) via a supply line. To reduce the temperatures of the exhaust gas of the gas stove, part of the forced air supply is separated from that which is used as combustion air and is mixed with the exhaust gas produced during combustion as it proceeds towards a discharge pipe (27). The first mixing of part of the inlet air is effected through openings (18) in an insulation plate (7) which receives burner plates (1) and a space (9) beneath the burner plates (1). In a space (8) part of the inlet air is mixed with the exhaust gas; the mixture arrives at a collection chamber (19) which is cleared by means of a further supply of inlet air from a space (20). After leaving the collection chamber (19) the exhaust gas passes through an outlet aperture (23) into a manifold (26) of the discharge pipe (27). When the exhaust gas leaves the exhaust gas collection chamber (19) and enters the manifold (26) a further supply of inlet air passes through openings (28 and 29) and mixes with the exhaust gas, and the exhaust gas temperature is reduced to a level such that no damage from heat can be caused in the vicinity of the discharge pipe (27).

Description

Gas cookers, especially for caravans

description

The invention relates to a gas cooker, in particular for caravans, with at least one radiation burner covered by a heat transfer plate and formed from a perforated burner plate according to the preamble of claim 1.

Such a gas cooker is known from DE-GM 80 26 018. With this gas cooker, the exhaust gas generated during combustion is discharged via a discharge duct on the back of the gas cooker. Due to the special design of this discharge channel, it is possible to use the gas cooker to heat a room. This ge schieht in that sucked air on the A ^• führka-. nal is passed by. The one needed for combustion

Fresh air is drawn in through separate ducts that are not connected to the discharge duct.

This known gas cooker is characterized by the fact that it can also be used as a heater in addition to being used as an ordinary gas cooker.

A disadvantage of the known gas cooker, however, is the special arrangement of the rear wall, which on the one hand requires an increased space requirement and on the other hand causes the exhaust gases to be removed directly from the caravan wall. In this known gas cooker, the temperatures of the exhaust gas are of course relatively high, especially since the fresh air drawn in does not come into contact with the discharge duct in order to cool it, if necessary. Especially when not in use of the gas furnace as a heater would have to be ensured in any case that no heat damage could occur in the vicinity of the discharge duct. To do this, it would at least be necessary to provide the discharge duct with elaborate shielding or insulation, as a result of which additional space is used which is lost for other use.

The object of the invention is to improve a gas cooker of the type described in the introduction in such a way that, with optimal combustion of the gas supplied, shielding or isolation of the discharge duct can be dispensed with without having to fear heat damage in the immediate vicinity of the discharge duct. In addition, an optimal use of the cooking device with a diverse use in caravan kitchen areas is to be achieved.

To achieve this object, a gas cooker of the generic type mentioned in the preamble of claim 1 is assumed, which according to the invention has the features mentioned in the characterizing part of claim 1.

The fan connected to the supply duct and sucking in the supply air from the outside allows the proportion of the combustion air to be mixed into the gas to be metered with sufficient accuracy to bring about optimal combustion. With a further portion of the supply air, the same pressure conditions can be maintained in the vicinity of the burner plate, in that, according to the invention, at least one outlet opening of the supply channel into one -3-

1 space opens below the burner plate, which is connected via at least one pressure equalization opening to a space above the burner plate, whereby the exhaust gases produced there are simultaneously pre-cooled before they enter

5 enter the exhaust gas collection room. Since, according to the invention, at least one outlet opening of the supply channel also opens into a space surrounding the exhaust gas collection space, the exhaust gas is subjected to intermediate cooling in the exhaust gas collection space. Finally, the exhaust gas is finally cooled in accordance with the invention. that part of the supply air from the space surrounding the exhaust gas collection space enters the discharge duct via a transfer opening and mixes therein with the exhaust gas.

The design according to the invention allows, for example, the exhaust gas to be cooled to approximately 145 ° C. in the mouth area of the discharge duct at full burner output and, after mixing with the supply air introduced into the discharge duct, has, for example, at the end of the connecting elbow in Flow direction still about 110 C,

20th

According to one embodiment of the invention, the exhaust gas collection space is provided with a raised floor and the cavity formed thereby is connected via an inlet opening to the space surrounding the exhaust gas collection space and via an outlet opening to the discharge duct.

As a result of this configuration, a portion of the supply air flows around the side walls of the exhaust gas collection space, a portion of which is in turn branched off in order to selectively act on the bottom of the exhaust gas collection space 30.

According to further refinements of the invention, the outlet opening of the cavity under the exhaust gas collection space opens into the discharge channel of the exhaust gas collection space in the form of a nozzle and the outlet opening of the exhaust gas collection space in turn opens into the discharge channel in the form of a nozzle. -4- The nozzle-shaped outlet opening of the cavity under the exhaust gas collection space results in a suction effect on the exhaust gas to be removed from the exhaust gas collection space.

Finally, in order to reduce the flow resistance of the supply air and to even out its admixture to the combustion gas, one embodiment of the invention provides that the central axis of the pressure compensation opening runs at an acute angle, inclined to the direction of flow.

According to a further advantageous exemplary embodiment of the invention, the continued cooking zone, which extends beyond the projection of the burner plate, can be heated with the exhaust gas flowing through it, due to the exhaust gas collecting space arranged underneath, thereby making good use of the heat expended for the operation of the gas cooker ¬ menergie results. In addition, the exhaust gas collection space enables the lateral connection of the discharge duct according to the invention, so that the rear of the cooker, free of channels, enables the cooker to be arranged in a sealed manner, for example on the inside of a wall of a caravan. In addition, the parallel arrangement of the discharge duct and the feed duct leads to a space-saving duct arrangement, which is particularly important in the case of narrowly limited space conditions.

This configuration results in a particularly compact arrangement of the channels, which can thereby be provided in a simple manner with a common cladding which can be optically integrated with a wall in question.

According to a further embodiment of the invention, a plurality of burner plates, each with a further cooking zone sufficient beyond their projection, is assigned a common flue gas collecting space. Due to the inventive multiple flue gas collecting chamber, there is the possibility of having a large continued cooking zone available even when only one burner plate is in operation.

Finally, one embodiment of the invention provides that the heat transfer plate is integrated in a receiving and storage plate forming part of a sink, this embodiment having a very advantageous effect because of the small space requirement for caravans.

Two exemplary embodiments of a gas cooker according to the invention are shown in the drawing. Show it:

Figure 1 is a plan view of the gas stove, partially in a horizontal cross section.

FIG. 2 shows a vertical cross section of a schematic illustration of the gas cooker according to FIG. 1;

3 shows a vertical cross section of a gas cooker integrated in the receiving and storage plate of a sink;

4 shows a plan view of the representation according to FIG. 3.

The gas cooker consists of two conventional burner plates 1 arranged side by side, each with a radiation burner, which are covered at a vertical distance with a continuous heat transfer plate 2. From a supply line 3, which has a valve 4, the burner plates 1 are supplied with a certain amount of gas, for example for a power of 2.6 kW 205 g / h, from a source (not shown) via branch lines 6 which are also provided with valves 5 . -6- The burner plates 1 are embedded in an insulating plate 7 arranged parallel to the heat transfer plate 2, which space 8 above the burner plates 1 - horizontally bounded by the heat transfer plate 2 and the insulating plate 7 - from a space 9 below the burner plate plates 1 - horizontally delimited by the insulating plate 7 and a base plate 10 of the gas cooker housing - from one another.

Via a connection elbow 11 of a supply duct 12, to which a fan 13 is connected, the gas cooker is forced to have a defined supply air volume flow,

3 for example 8 m / h, fed. The supply air passes through a line 14, wherein. Outlet openings 15 are provided in the space 9 below the burner plates 1.

As shown in FIG. 1, part of the supply air is supplied as combustion air via openings 16 in an end piece 17 of the branch lines 6 of the burner plates 1. A further part of the supply air comes from the room 9 below the burner plates 1 through transfer openings 18 in the insulating plate 7 into the room 8 above the burner plates 1. This part of the supply air mixes in the room 8 with that resulting from the combustion, exhaust gas is approx. 700 ° C and pre-cools it.

The exhaust gas / supply air mixture pre-cooled in this way reaches an exhaust gas collection space 19 which is encased by a space 20 and which also has a double floor 21. Via an additional outlet opening 22 in the line 14, a further part of the supply air enters the space 20 and flushes around the exhaust gas collecting space 19, an essential part of the supply air reaching an area 24 delimited by the double floor via an inlet opening 23. On the floor and wall side, the exhaust gas collection room undergoes intensive cooling. -7-, whereby the exhaust gas within the exhaust gas plenum 19 experiences a further cooling to approx. 330 C when a burner plate 1 is at full load or to 400 C when both burner plates 1 are at full load.

The exhaust gas further cooled in this way passes through a nozzle-shaped outlet opening 25 into a connecting elbow 26 of a discharge duct 27. The inlet cross-section of the connecting elbow 26 is arranged towards the outlet opening 25 in such a way that mainly through the flow of the intake air portion from the space 24 a nozzle-shaped outlet opening 29, but also through the flow of the supply air portion from the space 20 through an annular transition opening 28 the exhaust gas / supply air mixture is sucked out of the exhaust gas collection space 19 and mixed with the supply air portions. The temperature of the exhaust gas / supply air mixture is finally approximately 145 ° C. when a burner plate 1 is operating at full load directly in the inlet area of the connection elbow 26 and, after the exhaust gas has been mixed with the supply air, is only approximately 110 ° C. at the connection area of the discharge duct 27 The corresponding temperature values in the case of full load operation of both burners are approximately 180 ° C. in the inlet region of the connecting elbow 26 and approximately 145 ° C. in the connecting region of the discharge duct 27.

The gradual cooling of the exhaust gas is selected so that the amount of heat required for a continued cooking zone can also be derived from this over the first part of the flow path of the exhaust gas, whereas intensive cooling of the exhaust gas over the further part of the flow path, in particular through repeated mixing of supply air is brought about. As a result, the temperature of the exhaust gas and therefore that of the discharge duct 27 can be limited without shielding and insulating measures so that heat damage is not to be feared even in the immediate vicinity of the discharge duct 27. A heat transfer plate 2, which covers two radiation burners 3 arranged next to one another, is integrated into a receiving and storage plate 1. Each radiant burner 3 has a perforated burner plate 4 and the usual gas supply, ignition and monitoring devices.

The exhaust gases formed between the burner plate 4 and the heat transfer plate 2 enter an exhaust gas collection space 5 which, viewed from the operator side of the cooker, is arranged behind the burner plates 4 and is covered by the heat transfer plate 2. The two burner plates 4 common exhaust gas collecting space 5 creates an extensive continued cooking zone on the area of the heat transfer plate 2 arranged above.

To the side of the exhaust gas collecting space 5 there is an upwardly deflected connecting elbow 6 for a discharge duct 7. In addition to the connecting elbow 6, a downwardly deflected connecting elbow 8 is provided for a supply duct 9, via which the radiation burners 3 are supplied with combustion air. while the exhaust gas is safely discharged from the exhaust gas collection space via the discharge duct 6.

Claims

_9_ Claims

1. Gas stove, in particular for caravans, with at least one radiation burner covered by a heat transfer plate and formed from a perforated burner plate, which can be acted upon with gas and combustion air via a feed channel, the resultant between the burner plate and the heat transfer plate Exhaust gases can be fed to an exhaust gas collection space, to which a discharge duct is connected, characterized in that a fan (13) which draws in air from the outside is connected to the feed duct (12) and at least one outlet opening (15) of the feed duct (12) into one Space (9) opens below the burner plate (1), which is connected via at least one pressure compensation opening (18) to a space (8) between the burner plate (1) and the heat transfer plate (2), and at least one outlet opening ( 22) of the feed channel (12) opens into a space (20) surrounding the exhaust gas chamber (19) which is connected via an outlet opening (28) to the discharge channel (27).

2. Gas cooker according to claim 1, characterized in that the exhaust gas collecting space (19) is provided with a raised floor (21), and the cavity (24) thereby formed has an inlet opening (23) with which the exhaust gas collecting space (19 ) surrounding space (20) and is connected to the discharge duct (27) via an outlet opening (29).

3. Gas cooker according to at least one of claims 1 to 2, characterized in that the outlet opening (29) of the cavity (24) under the exhaust gas collecting space (19) in the form of a nozzle in the discharge channel (27) of the exhaust gas collecting space (19) flow out.

4. Gas cooker according to at least one of claims 1 to τ10-3, characterized in that an outlet opening (25) of the exhaust gas collection space (19) opens into the exhaust gas channel (27) in a nozzle shape.

5. Gas cooker according to at least one of claims 1 to 4, characterized in that the central axis of the pressure compensation opening (18) runs at an acute angle, inclined to the direction of flow.

6. Gas cooker according to at least one of claims 1 to 5, characterized in that the heat transfer plate (2, 31), viewed from the operating side of the cooker, extends beyond the projection of the burner plate (1, 33) to the rear Has a cooking zone (39), below which the exhaust gas collecting space (19, 34) is arranged, which is laterally provided with an upwardly deflected connecting elbow (26, 35) for the discharge channel (27, 36), which is located in the Proximity of a downwardly deflected connection elbow (11, 37) for the feed channel (12, 38) is arranged.

7. Gas cooker according to at least one of claims 1 to 6, characterized in that the central axis of the feed channel (12, 38) and the central axis of the discharge channel (27, 36) are arranged in a vertical plane.

8. Gas cooker according to at least one of claims 1 to 7, characterized in that a plurality of burner plates (1,33), each with a cooking zone (39) sufficient for their projection, is assigned a common flue gas collecting space (19, 34) .

9. Gas cooker according to at least one of claims 1 to 8, characterized in that the war -1 1 - transmission plate (2, 31) is integrated in a receiving and storage plate (30) forming part of a sink.