Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F24—HEATING; RANGES; VENTILATING
  • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
  • F24F7/00—Ventilation
  • F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
  • F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
  • F23L17/00—Inducing draught; Tops for chimneys or ventilating shafts; Terminals for flues
  • F23L17/16—Induction apparatus, e.g. steam jet, acting on combustion products beyond the fire

Definitions

• This invention relates to a method of mechan- ically removing gas from a room space, wherein
• the gas flues of open fireplaces are commonly provided with a suction-type fan which is mounted at the top of the chimney directly on the gas flue in such a way that hot flue gases flow sidewardly out of the flue under the influence of the centrifugal force of the fan, while the motor of the fan remains outside the flow of flue gases.
• This kind of fireplace fan operates well when lighting the fireplace, but after the fire ⁇ place has warmed up and the chimney effect has been created, it should be possible to switch off the fan or to reduce its power as otherwise the suction is too great, and the fan is disturbingly noisy.
• the fan cannot be switched off, because the motor of the fan will burn if the cooling of the motor is not in operation.
• the fireplace fan is of special structure and therefore expensive.
• the gas flue is difficult to clean as the fan blocks the flue, thus preventing sweeping.
• the object of the present invention is to pro- vide a method which avoids the need of a separate fan. This object is achieved by means of a method of the invention which is characterized in that the air for the injection effect is passed into the flue by means of the fan selectively from the exhaust air duct and/or from outdoor air.
• This method is based on the idea that the fan which is used for the removal of harmful gases, such as flue gases from the fireplace, is also used for the ventilation of the room space, or in other words, the suction required for the removal of harmful gases, such as flues gases from the fireplace, is created with a fan already used for removing exhaust air from the room space. In this way, a single fan operating as a combined gas removal and ventilation fan is sufficient.
• the invention is also concerned with a device for applying the above-mentioned method.
• This device is characterized by what is disclosed in claim 3.
• the device provides the advantages mentioned in con- nection with the method. In the following the invention will be described in greater detail with reference to the attached drawing, in which
• Figure 1 illustrates schematically the oper- ating principle of the method according to the inven ⁇ tion as well as the structure of a device developed for applying the method;
• FIG 2 is a perspective view of the fan portion of the device when mounted upon a chimney.
• the removal device shown in the drawing com ⁇ prises a fan 1 mounted in a housing 2 attached upon a chimney 3, Figure 2, in the vicinity of a gas flue 6 of a fireplace 5 in a room space 4.
• a fan inlet 7 communicates with an exhaust air duct 8 forming a part of the ventilation system of the room space.
• the nozzle is surrounded with a covering 11 provided with a spark catcher.
• a bypass duct 13 leading into outdoor air and provided with a damper 12 is connected be ⁇ tween the fan outlet and the nozzle.
• the fan outlet communicates with an outdoor air supply duct 15 provided with a damper 14. During the operation of the fan, a flow of air
• a from the injector nozzle creates draught in the gas flue of the fireplace. This draught sucks the flue gases out of the chimney.
• part of the air blown by the fan can be passed directly into outdoor air through the bypass duct 13 and thus affect the suction effect of the injector.
• the fan sucks the air that it needs from the exhaust air duct 8 of the room space, thus simulta ⁇ neously operating as a removal fan for the ven- tilation system.
• part of the air can be taken directly from the outdoor air supply duct 15.
• the injector nozzle is shaped or positioned in such a manner that the opening of the gas flue remains free, e.g. by using an annular nozzle or by securing the nozzle to the edge of the flue.
• the fan speed can be adjusted by a potentio- meter 16 to achieve adequate draught in the gas flue.
• the drawings and the description related to them are only intended to illustrate the idea of the invention. In their details, the method and the device of the invention may vary within the scope of the claims.
• the device can be used in industrial processes at exhaust points for hot gases, explosive gases, gases contaminating the fan, dust and the like.

Landscapes

• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Ventilation (AREA)

Applications Claiming Priority (1)

Publications (1)

Family

ID=8529542

Family Applications (1)

Country Status (3)

Cited By (4)

Citations (5)

• 1989
  • 1989-12-19 FI FI896101A patent/FI87399C/fi not_active IP Right Cessation
• 1991
  • 1991-02-06 EP EP19910903529 patent/EP0570369A1/en not_active Ceased
  • 1991-02-06 WO PCT/FI1991/000037 patent/WO1992014100A1/en not_active Application Discontinuation

Patent Citations (5)

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