FI87399C - Method and apparatus for arranging mechanical gas removal in a room - Google Patents

Description

1 87399

The present invention relates to a method for arranging mechanical degassing of a room 5, according to which - harmful gases are removed from the room by sucking gases through a flue to which used room air is removed from the room by suction through the exhaust air duct.

In order to increase the suction power in the chimneys of fireplaces, a fan of the top extractor type is generally used, which is mounted on the chimney directly on the chimney so that hot flue gases flow out of the flue laterally due to the centrifugal force of the fan. The functionality of such a vacuum cleaner is good when lighting the fireplace, but once the fireplace has been heated and a chimney effect has occurred, the fan should be able to be stopped or its power reduced because otherwise the suction is too high and the fan noise is annoying. However, it is not possible to stop the fan because the motor cooling 25 will not work and the motor will return. The fireplace vacuum cleaner has a different construction and is therefore expensive. In addition, cleaning the flue is difficult because the fan clogs the flue and prevents sooting.

It has previously been proposed to avoid the above-mentioned disadvantages by developing suction into the gas flue by means of the injection effect provided by the air flow introduced into the flue. The gases to be removed are thus circulated by the suction provided by the injector nozzle, whereby the air flow required for this can be developed on the side of the gas flue. As a result, the fan does not come into contact with the gases 2 87399 and thus does not have to be of special construction, but can be a cheap and simple, standard series fan. The fan power can be freely reduced and the fan can even be switched off during operation without the risk of the fan bearing and motor burning. However, the disadvantage of such a solution is the need for a separate fan, which increases the cost of the degassing system of the stove.

It is an object of the present invention to provide a paddle method which avoids the need for a separate fan. This object is achieved by the method according to the invention, which is characterized in that the air is introduced into the flue for the injection effect by a fan, optionally from the exhaust air duct and / or the outside air.

15 Such a method is based on the idea that the other air conditioning in the room is treated by the same fan used to remove harmful gases such as fireplace flue gases or, conversely, that the suction required to remove harmful gases such as fireplace flue gas 20 is generated by the same fan used to remove used room air. . This is accomplished with a single fan that acts as a combined degassing and general ventilation fan.

The invention also relates to a device for applying the above-mentioned method. This device is characterized by what is stated in claim 3. This device achieves the advantages mentioned in connection with the method.

The invention will be explained in more detail below with reference to the accompanying drawing, in which Fig. 1 schematically shows the principle of operation of the method according to the invention and the structure of a device developed for carrying out the method, and Fig. 2 is a perspective view of a blown 3,87399 device mounted on a chimney.

The exhaust device shown in the drawing comprises a fan 1 mounted in a housing 2 mounted on a chimney 3, Fig. 2, next to the chimney 6 of the fireplace 5 in the room 4. The fan inlet 7 is connected to an exhaust air duct 8 belonging to the room air conditioning system. The fan outlet 9 is in turn connected to an injector nozzle 10 which extends into the flue and points upwards-10 with its discharge opening. The nozzle is surrounded by a cover 11 with a spark net. A bypass pipe 13 with a replacement or control damper 12 is connected between the fan outlet point and the nozzle, which leads to the outside air. The outlet of the fan is connected to an air intake pipe 15 with an exchange or control damper 14, which is connected to the outside air.

As the fan runs, air flow A flows from the injector nozzle, which develops a draft in the chimney of the stove which sucks the flue gases out of the chimney. With the control damper 12, a part of the air blown by the fan can be blown directly into the outside air 20 through the bypass pipe 13 and thus affect the suction effect of the injector.

The fan sucks the air it needs from the room air outlet duct 8 and thus also acts as a ventilation exhaust fan. With the damper 14, part of the air can be taken directly from the outside air via the air intake pipe 15.

Note that only a single fan is needed for the fireplace and other ventilation in the building. The hot gases from the fireplace do not flow through the fan 30. When the damper 12 is turned to the fireplace position, other ventilation is reduced, which is desirable because it is desired for the air to escape along the flue with the smoke. By appropriately shaping the injector nozzle, the ventilation of the building can be kept in balance, even if the use of the vacuum cleaner is intermittent.

4,87399

By shaping or positioning the injector nozzle so that the flue opening remains free, e.g. by using a ring nozzle or by placing the nozzle at the edge of the flue, the flue can be cleaned without hindrance.

5 Through the potentiometer 16, the fan speed is adjusted to suit the correct draft of the flue.

The drawing and the related explanation are only intended to illustrate the idea of the invention. The individual details of the method and device according to the invention may vary within the scope of the claims. The device can be used in industrial outlets with hot gases, explosive gases, fan fumes and dust and the like.

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Claims (5)

A method for arranging the mechanical removal of gases from a room space (4), according to which method - harmful gases are removed from the room space by sucking the gases through a gas duct (6), whereby a suction is produced by means of a injector power is effected by the side of a duct by means of a fan (1) in the duct introduced air stream (A), and - consumed room air is removed from the room space by suction through an air removal duct (8), characterized in that the air for the injector the power is introduced by the fan (1) or alternatively from the air removal duct (8) and / or from the outdoor air (15). Method according to claim 1, characterized in that a portion of the air from the air removal duct (8) is diverted to the outside air (13) before the gas duct (6). Apparatus for removing gases from a room space (4) through a gas duct (6), comprising a fan (1) mounted on the side of the gas duct, the outlet (9) of which is connected to an insertion in the gas duct (6) injector nozzle (10), and the inlet (7) of which is connected to an air source (15) located outside the gas duct (6) to provide an air stream (A) which produces a suction effect in the gas duct, whereby the room space (4) is provided an air removal duct (8) for mechanical air exchange of spent air, characterized in that the inlet (7) of the fan (1) is connected to a vented inlet duct (15) over a regulating damper (14) which alternatively controls connection of the inlet with the air removal duct (8) of the room space (4) and with the outdoor air inlet s 87399 duct (15). Device according to claim 3, characterized in that the outlet (9) of the fan (1) is connected to an air removal duct (13) which passes past the gas duct (6) and leads to the outside air, over a control damper (12), which alternatively controls the outlet connection with the injector nozzle (10) and the air removal duct (13). 5. Apparatus according to claim 3 or 4, characterized in that the fan (1) consists of a suction fan for fireplaces, which is designed to be mounted next to the flue (6) in the chimney (3) of the fireplace.