EP0263892A1 - Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine - Google Patents

Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine Download PDF

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Publication number
EP0263892A1
EP0263892A1 EP86114329A EP86114329A EP0263892A1 EP 0263892 A1 EP0263892 A1 EP 0263892A1 EP 86114329 A EP86114329 A EP 86114329A EP 86114329 A EP86114329 A EP 86114329A EP 0263892 A1 EP0263892 A1 EP 0263892A1
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EP
European Patent Office
Prior art keywords
apertures
cooking
air
ventilator
products
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86114329A
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German (de)
English (en)
Inventor
Victor D. Molitor
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Individual
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Individual
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Publication date
Priority to US06/730,600 priority Critical patent/US4617909A/en
Application filed by Individual filed Critical Individual
Priority to EP86114329A priority patent/EP0263892A1/fr
Publication of EP0263892A1 publication Critical patent/EP0263892A1/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/20—Removing cooking fumes

Definitions

  • This invention relates to a method of and device for retarding or preventing the rollout or curling of smoke from underneath a hood or bonnet of a grease extraction ventilator.
  • a grease extraction ventilator comprises a series of depending walls which essentially surround an enclosure which is placed above the cooking equipment, so that heated air and products of cooking, rising from the cooking equipment, will collect in the bonnet and will flow toward the grease removal portion of the ventilator, then into a duct which extends to an exhaust fan or blower for exhausting the remaining air and gases, such as into the atmosphere.
  • the exhaust fan produces a suction in the duct and draws the air and products of cooking through the grease removal means, which also may condense water vapor and remove small particles.
  • All such ventilators have the problem, at times, of being flooded with smoke, as when a fire occurs, particularly on a broiler or other type of cooking equipment operating at higher temperatures.
  • room air is drawn under the walls which surround the enclosure, which walls are normally the front and end walls, since the usual installation of a grease extraction ventilator is against a wall of a kitchen.
  • a method of retarding or preventing the curling or rollout of smoke from beneath the edges of the depending walls which form an enclosure for receiving the products of cooking as well as room air to provide such a method which is effective and efficient in overcoming this problem; to provide such a method which may be carried out with a minimum of expense; to provide a device which is particularly adapted to carry out the method of this invention; and to provide such a device which is readily and inexpensively incorporated in a grease extraction ventilator.
  • the method of preventing the curling or rollout of smoke from beneath the depending enclosure walls of a grease extraction ventilator comprises providing a series of apertures in the upright walls from adjacent the lower edge thereof for a predetermined distance upwardly.
  • the apertures are preferably comparatively small and relatively closely spaced, being preferably placed in parallel rows, also parallel to the lower edge of the wall, with the apertures of one row alternating in position with the apertures of adjacent rows, in order to maintain as much strength as possible in the walls.
  • the number of rows may be varied, depending on the height of the wall and the capacity of the ventilator with additional apertures for a ventilator having a larger capacity.
  • the apertures may be slots, such as relatively short, and with the spacing between parallel rows being equal to or less than the height of the slots, with the lowest row being relatively close to the lower edge of the wall in which provided.
  • the apertures may be circular or have any other shape, such as oval, elliptical or the like.
  • a smoke curl or rollout prevention method for a grease extraction ventilator to prevent or retard the curling or rollout of smoke from underneath the walls of a hood or bonnet of the ventilator into a room may be utilized, as illustrated in Figs. 1-3, to provide an appropriate number of rows of alternate slots 10 and 11, disposed just above and with each row essentially parallel to, the lower edges of each of the walls, panels, or the like under which room air may be drawn to mix with heated air and products of cooking produced by cooking equipment C beneath the ventilator.
  • Such walls of the ventilator V include a front depending flange 12, an extension 13 of one side wall 14, as in Fig. 1, and an extension 15 of the opposite side wall, as in Figs. 2 and 3.
  • Each of extensions 13 and 15 have an upwardly inclined lower edge.
  • Rows of holes may be substituted for the rows of slots 10 and 11.
  • the heated air and products of cooking move into the hood or bonnet, both by natural convection and suction by which the same are drawn upwardly through the ventilator and through a duct 16 extending, as indicated by the dotted line, to an exhaust fan 17 (shown in outline) at an appropriate location, as for discharge into the atmosphere.
  • the exhaust ventilator V of Fig. 1 is constructed similarly to the exhaust ventilator of U. S. Patent No. 3,841,062, thus including a shelf 18 from which front flange 12 depends and a top plate 19 connects the end walls, as well as a front plate 20 having an access plate 21.
  • the top plate 19 is also connected to a back plate 22 of Fig. 2, while exhaust duct 16 extends upwardly from top plate 19.
  • a control box B, mounted on shelf 18, may be provided with a light switch 23 and a wash control switch 24 for turning on a washing mechanism, which will be referred to later.
  • Fig. 2 The parts shown in Fig. 2 are essentially inside the ventilator and include a front plate 26 having a rearwardly extending curl 27 at the top, with plate 26 being connected to a bottom plate 28, which in turn extends rearwardly to the back plate 22.
  • a fixed baffle 29 slopes downwardly above front plate 26 to a dow nwardly extending arcuate portion 30, while an adjustable baffle 31 having a front planar flange 32 is connected to arcuate portion 30 by bolts 33, to permit adjustment of the position of flange 32.
  • Air and products of cooking are drawn between baffle 29 and curl 27, through suction produced by the discharge fan through duct 16, to engage a water bath which, prior to such engagement, extends upwardly to a dot-dash line 34 but is forced downwardly to pass under flange 32 and behind baffle 31, engaging a concave water deflector plate 35, whose rear edge is spaced slightly from back wall 20.
  • Flange 37 tends to strip water droplets from the air passing around it, the droplets tending to fall onto the top of fixed baffle 29. From the space above flange 37, the mixed air and products of cooking, without the water and other condensable products which have been stripped by flange 37, pass into the duct 17 for discharge.
  • a hot water feed pipe 39 extends along the rear wall above brackets 38 and carries a series of nozzles 40 which spray hot water into the upper chamber against the rear of front wall 20 and the underside of top plate 19, as well as being deflected against the top of fixed baffle 29.
  • One or more supply pipes 41 may extend to a manifold 42 below brackets 38, which carries a series of nozzles (not shown) for cleaning the upper side of air deflection plate 36.
  • the number of rows of slots may be varied. depending upon the size of the ventilator and also the amount of air normally drawn from the room in which the ventilator or a series of ventilators are installed.
  • the speed of the conventional blower, by which air and products of cooking are removed through duct 16, may be controlled so that the suction is increased as the amount of heated products of cooking and room air increases, although it may happen that, even when the suction blower is operating at full capacity, the amount of heated products of cooking further increase and, at times, an undue amount of smoke is produced. At such times, there is a tendency for the heated gases carrying smoke to accumulate and expand, so as to curl under the lower edges of the hood, thereby carrying smoke and cooking odors into the room. Such smoke, and particularly cooking odors, tend to infiltrate into the dining areas, with a resultant distasteful effect on those partaking of food there.
  • Such decrease in volume apparently also increases the velocity with which the heated waste air rising from the cooking surfaces moves into the hood or bonnet, thereby producing an increase in the flow of air through the apertures in the outer walls of the ventilator and thereby eliminating the escape of waste heat, fumes and smoke into the room.
  • the slots 10 and 11 are placed in stagerred relation, in order to obtain maximum strength of the depending walls around the perimeter of the hood.
  • the slots 10 and 11 may be on the order of 2 inches or 5,08 cm long, 1/4 inch or 0,635 cm high and spaced apart in each row on the order of 1/2 inch or 1.27 cm, while the distance between rows may be on the order of 1/4 inch or 0,635 cm.
  • the method of preventing smoke curl of this invention may be applied to a ventilator V ⁇ of Fig. 4, which may similarly be provided with a row of slots 10, interspaced and alternating with rows of slots 11, in a manner similar to ventilator V of Fig. 1.
  • the rows of slots 10 and 11 are preferably placed in parallel relation to the lower edge of a lower front wall 45 of Figs. 1 and 6, as well as an end wall 46 of Figs. 5 and 7 and a corresponding end wall at the opposite end of front wall 45, i.e. having slots disposed in the same manner as end wall 45 in the lower portion thereof.
  • the room air and heated air and products of cooking arising from the cooking equipment over which the ventilator is placed in a manner similar to the ventilator V of Fig.
  • Figs. 4-7 flow within the walls of the hood or bonnet, which include lower front wall 45, end wall 46 and the corresponding opposite end wall, to a device for removing grease and a discharge duct 47 of Figs. 1 and 5, which leads to a conventional fan or blower (not shown) for exhaust of the air and gases into the atmosphere.
  • the ventilator V ⁇ of Figs. 4-7 is constructed similarly to the ventilator of U. S. patent No.
  • 4,407,206 which is also adapted to temper fresh air in one or more heat exchangers and discharge the tempered fresh air into the room, as well as supply incoming air to the discharge duct in a manner which automatically regulates the amount of exhaust and makeup air required to remove and replace the minimal amount of outside air to eliminate heat, odors, smoke, gases, grease and dirt as the cooking load changes.
  • the exterior of the ventilator includes an upper front wall 49 and a manifold M from which tempered air is discharged into the room.
  • the interior of the ventilator V ⁇ , as in Fig. 5, includes an upper inlet baffle 50, between which and a lip or curl 51 at the upper end of a front plate 52, flow the air and products of coo king and perhaps combustion, pulled by the exhaust fan out through exhaust duct 47.
  • the lower edge of front plate 52 is connected to a bottom plate 53, which, in turn, is connected to a rear wall 54.
  • the normal level of water is determined by an overflow 58 connected to a base 59, in turn connected to an outlet 60.
  • the gas stream will agitate the water and churn it up into tongues, thereby condensing vapors which are condensable, such as grease, then flow upwardly against a horizontal baffle 61 having a downwardly slanting lip or flange 62, which tends to strip droplets of water or other liquid from the gas stream, such droplets falling onto the top of upper entrance baffle 50 to flow back down into the water bath.
  • Baffle 61 is supported by a series of spaced braces 63, while a front panel 64 and a top panel 65 complete the compartment into which the air and products of cooking flow.
  • mist eliminator E which is formed of woven or unwoven mesh, wire or the like, held by a pair of screens. Upward flow of these gaseous products continues into the discharge duct 47, past a fire damper 67 carrying a weight 68 and pivoted on a rod 69.
  • the lower end of the damper is connected to a wire 70, which extends to front wall 64 and in which a fuse link 71 is interposed, so that if the temperature rises sufficiently to melt the fuse link, as the result of fire, the base of the damper will be released and the weight 68 will cause the damper to fall to a closed position.
  • a series of nozzles 72 may be mounted at appropriate positions on the rear wall 54 and the front wall 64, to spray the front wall and the top of baffle 61, as well as the bottom of baffle 61, the rear wall 54 below baffle 61 and the top of baffle 50. This will tend to clean any collected grease off the interior walls of the compartment through which the air and products of cooking flow.
  • a principal temperature control device 73 may be mounted adjacent the intake of exhaust duct 47 and a secondary tempereature responsive control device 74 on the underside of a panel 75, which extends forwardly from baffle 50, so as to be responsive respectively to the temperature of exhaust gases just prior to entering the exhaust duct and the temperature of the exhaust gases just prior to flowing into the grease removal compartment of the grease extraction ventilator.
  • a panel 76 may extend from panel 75 to lower front wall 45 to complete the open bottomed enclosure in which air and products of cooking are collected for flow into the ventilator.
  • a light 77 may be installed above panel 76, to illuminate the enclosure.
  • a pump and motor 78 illustrated diagrammatically, transfer the water of the water bath, heated by flow of heated gases therethrough, to a series of heat exchangers H and supplied by a header 79, with return flow through a header 80 to the water bath.
  • the normally fresh air supplied to air intake duct 48 passes into a plenum chamber P flanked by a front wall 81 and an insulated rear wall 82.
  • a bypass duct 83 extends between chamber P and the exhaust duct 47, with a pivotally mounted damper 84 controlling the flow from plenum chamber P to exhaust duct 47.
  • the control will increase the flow of bypass air when the temperature at primary control device 73 decreases and will decrease the flow of bypass air when the temperature at the primary control device increases.
  • the secondary control device 74 may be utilized to increase or decrease the flow of bypass air when the temperature at control device 73 has not change d but the temperature at control device 74 suddenly increases or decreases. In other words, the control device 74 is utilized to anticipate a change in temperature at control device 73, which has not yet reached it.
  • the water transferred by pump 78 to the heat exchangers H through which the air from plenum chamber P flows into an outer compartment 85 will be heated in the winter time, since the water through which the heated air and products of cooking flow, will normally be heated to a temperature higher than that of outside air. However, during the summer time, when the outside air temperature is higher than the temperature of the water bath, the incoming air will be cooled.
  • the air thus tempered flows into the manifold M and is discharged into the room, through bottom louvres 86, downwardly alongside the upper front wall 49 and the lower front wall 45, while additional tempered air will flow through upper louvres 87 for discharge along the ceiling of the room.
  • Air which flows through louvres 86 may flow into the room, or into the hood through slots 10 and 11 or underneath the lower edge of the lower front wall 45.
  • the method of this invention may also be applied to a ventilator having a so-called "dry" type of filter, such as the ventilator V ⁇ of Figs. 8-11 having a filter F of the mesh type through which the heated gases and products of cooking pass from the cooking equipment for entrapment of smoke particles, moisture or the like, to an exhaust duct 90.
  • the ventilator V ⁇ in accordance with this invention, is provided with a series of slots 10 disposed in parallel rows, alternating with slots 11 disposed in parallel rows, above the lower edges of a front wall 91, as in Figs. 8 and 10, an end wall 92, as in Figs. 9 and 10, and an opposite end wall 93, as in Fig. 11.
  • Ventilator V ⁇ is provided with a top wall 94 and a rear wall 95, and also a rearwardly and downwardly slanting upper partition 96 for filter F, as well as a downwardly and forwardly slanting bottom panel 97.
  • Filter F or a series of filters in side-by-side relation, are received in brackets mounted on the lower edge of upper partition 96 and the upper edge of a series of rearwardly and downwardly slanting drain tubes 98, which collect liquid draining from the filters F and transfer the same to a catch basis 99.
  • the ventilator V ⁇ is installed against a wall and, for this purpose, a rear panel 100, at each end, may cover the space between rear wall 95 of the ventilator and the room wall 101.
  • a panel 110 which may be a front, side, end or other depending panel of a grease extraction ventilator, is provided with a series of circular holes 111, which are disposed in spaced relation in parallel rows and in offset or alternating relation to a series of holes 112, which are generally spaced apart in parallel rows interspaced with the rows of holes 111.
  • the holes 111 a nd 112 may be oval, rectangular, square, triangular, diamond-shaped, elliptical, trapezoidal, or of any other geometric configuration. In each instance, the particular shape of the holes does not matter, except that an arrangement of holes should be provided which causes adequate strength to be retained in the panel or wall in which the holes are placed.
  • the holes may have a diameter of 3/8 inch and be spaced apart, in each row, on the order of 1/8 inch, with the distance between diagonally related holes in adjacent rows being on the order of 1/8 inch.
  • the holes may follow a different configuration and be straight in line, while when in parallel rows, the rows may extend at different angles to the edge of the panel in which placed. It is desirable, of course, to maintain as many holes as possible fairly close to the lower edge of each panel in the wall in which placed, with the distance between and relative placement of the holes involving a consideration of the strength of the resultant structure and its ability to withstand the stresses to which the walls of the ventilator would be subjected.
  • Figs. 1-3 and Figs. 4-7 are shown with six rows of apertures, while the embodiment of Figs. 8-11 is shown with five rows of apertures and the variation of Fig. 12 is shown with seven rows of apertures. It will thus be understood that any desired number of rows, as well as other arrangements of the aperture, may be utilized.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
EP86114329A 1985-05-06 1986-10-16 Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine Withdrawn EP0263892A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US06/730,600 US4617909A (en) 1985-05-06 1985-05-06 Method of and device for preventing smoke curling from underneath the hood of a grease extraction ventilator
EP86114329A EP0263892A1 (fr) 1986-10-16 1986-10-16 Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP86114329A EP0263892A1 (fr) 1986-10-16 1986-10-16 Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine

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EP0263892A1 true EP0263892A1 (fr) 1988-04-20

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EP86114329A Withdrawn EP0263892A1 (fr) 1985-05-06 1986-10-16 Méthode et dispositif pour éviter une fuite de fumée d'une hotte de ventilation de cuisine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1441181A1 (fr) * 2002-12-19 2004-07-28 BSH Bosch und Siemens Hausgeräte GmbH Boítier pour une hotte d'extraction
CN109611912A (zh) * 2018-11-26 2019-04-12 浙江欧琳生活健康科技有限公司 一种防倒烟集烟罩及集成灶

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941039A (en) * 1974-11-18 1976-03-02 Air Distribution Associates, Inc. Cooking fume removal
JPS5575146A (en) * 1978-12-04 1980-06-06 Hitachi Ltd Ventilator
WO1983000377A1 (fr) * 1981-07-24 1983-02-03 Molitor Ind Inc Procede et appareil permettant de temperer de l'air d'appoint
US4617909A (en) * 1985-05-06 1986-10-21 Molitor Victor D Method of and device for preventing smoke curling from underneath the hood of a grease extraction ventilator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3941039A (en) * 1974-11-18 1976-03-02 Air Distribution Associates, Inc. Cooking fume removal
JPS5575146A (en) * 1978-12-04 1980-06-06 Hitachi Ltd Ventilator
WO1983000377A1 (fr) * 1981-07-24 1983-02-03 Molitor Ind Inc Procede et appareil permettant de temperer de l'air d'appoint
US4617909A (en) * 1985-05-06 1986-10-21 Molitor Victor D Method of and device for preventing smoke curling from underneath the hood of a grease extraction ventilator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1441181A1 (fr) * 2002-12-19 2004-07-28 BSH Bosch und Siemens Hausgeräte GmbH Boítier pour une hotte d'extraction
CN109611912A (zh) * 2018-11-26 2019-04-12 浙江欧琳生活健康科技有限公司 一种防倒烟集烟罩及集成灶

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