EP1939530B1 - Supplementary device for stoves - Google Patents

Abstract

The device has a connecting piece (12) staying in connection with a channel (15) for the supply of fresh air, where an isolation valve (17a) is inserted into the channel. Another channel (16) is inserted into the channel (15) in a flow direction of the fresh air and behind the isolation valve for the suction of a room air. The channel (15) is equipped with another isolation valve (16a). Another connecting piece (11) is connected with an upward directed channel (13) for the delivery of heated air, where the upward directed channel is equipped with an isolation valve (13b).

Description

The invention relates to an additional device for stoves, which are heated with solid fuels and operated without external fresh air.

FR-A1-2 556 820 describes such an accessory.

Stoves of different design have long been known. So-called normal wood-burning stoves generally draw the combustion air required for combustion from the room air. During the combustion process, a high radiant heat is generated in the immediate vicinity of the Helz source. Due to the rising heat, heat builds up under the ceiling of the heated room. In the floor area, a cold air layer remains over a longer period, which heats up only slowly. Drowsiness may occur near windows and doors. Due to the combustion process oxygen is extracted from the room air, so that a regular after-ventilation is necessary, whereby cold air enters the room again and draft phenomena occur. As a result, an unfavorable room climate sets in. Entering oxygen deficiency of the room air leads to signs of fatigue and has an adverse effect on the burning process.

In the case of wood-burning stoves operated with an external supply of fresh air, the fresh air passes directly into the combustion chamber of the stove. There is only a slight air movement in the room. In the ceiling area forms a heat accumulation and near the floor a relatively cold layer of air.

From practice, a stove with a cylindrical combustion chamber is known which is designed as a hot air oven. The combustion chamber is formed from bent steel tubes, the tube surface partially within the combustion chamber lays. Cold air is sucked in through the pipes, which flows from the bottom to the top, is heated and flows off at the upper end of the pipes as warm air. Due to the continuous circulation process, a rapid and uniform heating of the room air should be achieved.

The disadvantage of this stove is that the Luftumwälzvorgang takes place in the immediate installation area of the furnace. It must be ensured a constant supply of fresh air to compensate for the oxygen deprivation of the room air. The generated hot air is only distributed unevenly in the room, so that it comes especially in the vicinity of doors and windows to draft phenomena.

Also known are various solutions to equip stoves with a heat exchanger, in particular to use the discharged via the chimney flue gases for additional heat recovery.

A heat exchanger is known for a stove ( DE 81 05 368 U ), wherein in the firebox of the stove, a boiler with an air inlet opening and an air outlet opening, which are located outside of the firebox is arranged. Cold air is flowing Through the inlet openings in the boiler, is heated in this and returned as heated air through the outlet opening to the environment.

Although an additional heat exchanger contributes to an increase in the room air temperature, but does not eliminate the aforementioned deficiencies in terms of Luftvertellung and the indoor environment.

The invention has for its object to provide an additional device for stoves, which leads to a significant improvement in indoor climate, allows a good and uniform room air circulation, provides a sufficient amount of combustion air and can be installed at low cost.

According to the invention the object is achieved by the features specified in claim 1. Advantageous embodiments and further developments are subject matter of claims 2 to 8.

The flue gas outlet pipe of the stove is surrounded by an air-conducting jacket pipe with two offset by at least 90 ° arranged connecting pieces. The one connecting piece communicates with a first channel for supplying fresh air, in which a shut-off element is integrated. In the flow direction of the fresh air behind the obturator, in the first channel, a third channel for the intake of room air is involved, which is equipped with a shut-off. The other spigot is connected to an upwardly directed second duct for the delivery of heated air, which is equipped with a shut-off device.

The third channel for intake of room air is preferably connected to branch channels, which terminate at different points of the room, in the area of the wall bounding the room, near the floor.

The second, hot air leading channel is led to the area of the ceiling.

This can also be connected to branch channels whose outlet openings are arranged distributed in ceiling height.

During the Anhelzphase of the stove, the second channel is closed by means of a shut-off and the channels for the supply of room air and fresh air are open. After completion of the heating phase, the obturator in the second channel assumes an open position, the room air supply is interrupted and the channel for the fresh air supply is open.

During the further heating process, the channels for the supply of fresh air and room air are open or optionally switchable.

The auxiliary device can be coupled to an automatic control device, which controls the opening and closing of the shut-off devices by means of actuators based on measured values for the oxygen content in the room air, the flue gas temperature and the room air temperature.

The proposed accessory requires no additional electrical energy, is maintenance-free and easy to operate. It supplies the room and the heating source with the required combustion air through the independent intake of fresh air. In the heated Room is created a pleasant room climate, since it is sufficiently supplied with fresh air. In the room a good mixing of the room air is guaranteed due to the prevailing thermals.

Fig. 1

einen in einem Raum aufgestellten Kaminofen mit der erfindungsgemäßen Zusatzeinrichtung In vereinfachter Darstellung als Vorderansicht und

Fig. 2

den Kaminofen mit Zusatzeinrichtung als Seitenansicht.

The invention will be explained below using an exemplary embodiment. In the accompanying drawing show:

Fig. 1

a set up in a room stove with the inventive device in a simplified representation as a front view and

Fig. 2

the stove with additional equipment as a side view.

In the room 1 is on the floor 2 a solid fuel heated stove 7 ( Fig. 1 ). The room 1 is bounded by side walls 3, 4 and a ceiling 5. The stove 7 is placed in the immediate vicinity of the chimney 6 ( Fig. 2 ). The flue gas removal pipe 8 of the stove 7 is integrated into the associated chimney flue. A jacket tube 9 is arranged concentrically around the flue-gas removal tube 8, an annular channel 10 being formed between the flue-gas removal tube 8 and the jacket tube 9. The two end faces of the jacket tube 9 surround the flue gas outlet tube 8 airtight.

The jacket tube 9 has two connecting pieces 11 and 12, which are arranged offset by 180 °. The upwardly facing connecting piece 11 is connected to a riser 13 (second channel). The riser 13 extends into the ceiling area and has at its upper end an air outlet opening 13a, flows through the heated hot air. In the riser 13, a shut-off device 13b is incorporated to prevent the escape of not yet sufficiently heated air during the heating of the stove 7.

Since Stelgrohr 13 may additionally be connected to an air distribution line 14 which is circumferentially guided in the region of the ceiling 5, along the side walls 3, 4 and partially has air outlet openings 14a.

At the other, downwardly pointing port 12 of the jacket tube 9, a pipe or channel 15 is connected, which is connected to a line 16 (third channel) for supplying or suction of room air and a line 17 (first channel) for supplying fresh air , In the two lines 16 and 17, a respective obturator 16a and 17a is arranged so that the pipe or channel 15 either fresh air or room air can be supplied.

The two lines 16 and 17 are preferably laid below the floor 2. The conduit 16 for supplying room air is guided along the side walls 3, 4 and has a plurality of vertically arranged intake 16b, which are guided in the sidewall near the floor 2 and end immediately above the floor 2.

The conduit 17 for supplying fresh air is connected via an opening in one of the outer walls of the building with the outside air.

The operation of the attachment is the following:

During the Anhelzphase of the stove 7, the obturator 13b of the riser 13 is closed. The shut-off elements 16a and 17a of the lines 16 and 17 for the supply of room air and fresh air remain open. Due to the discharged through the pipe 8 in the chimney 6 hot flue gases in the annular channel 10 and riser 13 located air is heated. After completion of the Anhelzphase, the discharged into the chimney flue gas has reached an operating temperature of about 200 to 300 ° C, the obturator 13a is opened and closed the obturator 16 for supplying room air. The heated air in the riser flows near the ceiling and fresh air is sucked in via the line 17, which is heated during the flow around the hot flue gas discharge pipe 8 in the annular channel 10 to a temperature up to about 40 ° C. This warm air flows in the ceiling area via the riser pipe 13 or the air outlet openings 14a of the air distribution device 14 at ceiling height. The natural flow process prevents the formation of heat build-up in the ceiling area. The warm fresh air flows along the side walls 3, 4 of the room and ensures a uniform room air circulation. The room air is thus supplied with sufficiently heated fresh air, so that the oxygen content of the room air is relatively high and takes place by the combustion process taking place in the stove oxygen deprivation to no oxygen deficiency in the indoor air. After a certain heating period, the obturator 16a of the line 16 can then be opened, so that combined fresh air and room air are sucked in and heated. The accumulated in the floor near, still relatively cool air flows through the intake manifold 16b and is heated together with fresh air in the annular channel 10 and passes as heated air in the ceiling area of the room. If old shut-off elements 13b, 16a and 17a are completely or at least partially open, then a relatively stable flow level arises in the room. At times, the obturator 17a for the supply of fresh air can be closed, but it should be noted that the room should be supplied with fresh air in other ways.

The proposed additional device works automatically without external energy and ensures a pleasant indoor climate. It can be cheaply manufactured and assembled. If necessary, the opening and closing movements of the shut-off can be done by means of electric actuators, which are integrated into an automatic control system, via which also room temperature and / or oxygen content in the room can be monitored and controlled.

Claims (8)

1. Supplementary device for a stove which can be heated by solid fuels and is operated without a supply of fresh air, characterised in that the flue pipe (8) of the stove (7) is surrounded by an air-conducting jacket pipe (9) with two connection nozzles (11, 12) offset from each other by at least 90°, wherein one of the connection nozzles (12) is connected to an initial duct (15, 17) which supplies fresh air and into which a shut-off device (17a) is integrated, and a third duct (16) which draws in ambient air and is fitted with a shut-off device (16a) is integrated into the initial duct (15) in the direction of flow of the fresh air downstream of the shut-off device (17a), and the other connection nozzle (11) is connected to an upwardly directed second duct (13) which discharges hot air and is fitted with a shut-off device (13b).
2. Supplementary device according to claim 1, characterised in that the third duct (16) for drawing in ambient air is connected to branch ducts which terminate at different locations in the room near the floor in the regions of the walls enclosing the room and which have outlet openings (16b).
3. Supplementary device according to one of the claims 1 or 2, characterised in that the second duct (13) conducting hot air is conducted up to the region of the room's ceiling.
4. Supplementary device according to one of the claims 1 to 3, characterised in that the second duct (13) is connected to branch ducts (14) whose outlet openings (14a) are arranged and distributed at room ceiling height.
5. Supplementary device according to one of the claims 1 to 4, characterised in that the second duct (13) is closed by the shut-off device (13b) during the heating-up phase of the stove (7) and the ducts (16,17) for supplying ambient air and fresh air are opened.
6. Supplementary device according to one of the claims 1 to 5, characterised in that the shut-off device (13b) in the second duct (13) assumes an opened position after the heating-up phase has ended, the ambient air supply via the duct (16) is interrupted by a closed position of the shut-off devices (16a) and the duct (17) for the supply of fresh air is opened.
7. Supplementary device according to one of the claims 1 to 6, characterised in that the ducts (16, 17) for supplying fresh air and ambient air are opened or can be turned on as required during the further heating process.
8. Supplementary device according to one of the claims 1 to 6, characterised in that this device is coupled to an automatic control device which controls the opening and closing of the shut-off devices (13b, 16a, 17a) by means of control drives according to the measured values of the oxygen content in the ambient air, the flue gas temperature and the ambient air temperature.

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