WO2015179670A2 - Système de filtration pour hotte à plusieurs étages - Google Patents

Système de filtration pour hotte à plusieurs étages Download PDF

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Publication number
WO2015179670A2
WO2015179670A2 PCT/US2015/032018 US2015032018W WO2015179670A2 WO 2015179670 A2 WO2015179670 A2 WO 2015179670A2 US 2015032018 W US2015032018 W US 2015032018W WO 2015179670 A2 WO2015179670 A2 WO 2015179670A2
Authority
WO
WIPO (PCT)
Prior art keywords
filter
housing
filtration system
downstream
filter material
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.)
Ceased
Application number
PCT/US2015/032018
Other languages
English (en)
Other versions
WO2015179670A9 (fr
WO2015179670A3 (fr
Inventor
Jeffrey S. Lambertson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Streivor Air Systems Inc
Original Assignee
Streivor Air Systems Inc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US14/284,350 external-priority patent/US9732966B2/en
Application filed by Streivor Air Systems Inc filed Critical Streivor Air Systems Inc
Publication of WO2015179670A2 publication Critical patent/WO2015179670A2/fr
Publication of WO2015179670A3 publication Critical patent/WO2015179670A3/fr
Publication of WO2015179670A9 publication Critical patent/WO2015179670A9/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • F24C15/2035—Arrangement or mounting of filters

Definitions

  • the present invention relates generally to exhaust hoods, and, more particularly, to multi-stage filters for use with such hoods.
  • a plurality of cooking units are lined up side by side in a row under a common exhaust hood.
  • the cooking units may include, for example, ranges, griddles, fryers, and broilers.
  • the cooking processes performed on such equipment all produce air laden with grease, smoke, fumes, moisture, heat, and other particles in varying amounts and temperatures.
  • the air is drawn in to the exhaust hood, where it is filtered.
  • One known filtration system is disclosed in U.S. Patent 6,394,083 to Lambertson, the disclosure of which is hereby incorporated by reference.
  • a filtration system for a ventilation hood includes a first filter and a second filter, operatively disposed in series.
  • the first filter is configured to be mounted within the ventilation hood, and has an air inlet, an air outlet, and a grease outlet.
  • the second filter includes a filter material with an upstream surface and a downstream surface, an upstream housing element abutting the upstream surface of the filter material, and a downstream housing element abutting the downstream surface of the filter material.
  • the housing elements include openings, and hold the filter material in compression.
  • the second filter is disposed either downstream or upstream of the first filter.
  • the second filter may be attached, such as removably attached, to the first filter.
  • the housing elements may cooperate to define a housing for the filter material.
  • the housing may be configured to be opened to allow access to the filter material.
  • the upstream housing element may be hingedly attached to the downstream housing element such that the upstream housing element can be hinged open from the downstream housing element to thereby open the housing.
  • a latch may be provided, to hold the housing closed, and may be manipulable by hand to open and close the housing without requiring tools.
  • the ventilation hood may include a track, and the second filter may be configured to be inserted onto the hood by being moved along the track.
  • the first filter may also be configured to be inserted onto the hood by being moved along the track.
  • the first filter may be a cartridge filter or a baffle filter.
  • the filter material of the second filter may be natural fiber or synthetic fiber.
  • Figure 1 is a schematic cross-sectional view of a known cartridge filter.
  • Figure 2 is a schematic cross-sectional view of a first exemplary embodiment.
  • Figure 3 is a schematic cross-sectional view of a second exemplary embodiment.
  • Figures 4A-4L illustrate a third exemplary embodiment, where:
  • Figures 4A, 4B, and 4C are isometric views of a filter assembly in the closed, open, and filter material removed states, respectively;
  • Figure 4D is an isometric view of the filter assembly of Figures 4A-4C as viewed from the other side;
  • Figures 4E and 4F are a top and rear view, respectively, of the filter assembly of Figures 4A-4D;
  • Figures 4G, 4H, and 4I schematically illustrate removal of the second filter from the filter assembly of Figures 4A-4F;
  • Figure 4J is a cross-sectional view of the filter assembly of Figures 4A-4I mounted within a hood;
  • Figure 4K is a bottom plan view thereof, looking up at the hood from underneath;
  • Figure 4L schematically illustrates the filter assembly of Figures 4A-4K mounted in a hood above an item of cooking equipment
  • Figures 5A-5N illustrate a fourth exemplary embodiment, where:
  • Figures 5A, 5B, and 5C are isometric views of a filter assembly in the closed, open, and filter material removed states, respectively;
  • Figure 5D schematically illustrates removal of the first filter from the filter assembly of Figures 5A-5C;
  • Figures 5E and 5F are side views of the second filter of Figures 5A-5D, illustrating the closed and open states, respectively;
  • Figures 5G, 5H, and 51 are a rear, front, and top view, respectively, of the filter assembly of Figures 5A-5F;
  • Figures 5J and 5K are cross-sectional views of the filter assembly of Figures 5A-5I mounted within a hood, with the second filter in the closed and open states, respectively;
  • Figures 5L and 5M are bottom plan views thereof, looking up at the hood from underneath, with the lefthand second filter in the closed and open states, respectively;
  • Figure 5N schematically illustrates the filter assembly of Figures 5A-5M mounted in a hood above an item of cooking equipment
  • Figures 6A-6H illustrate a fifth exemplary embodiment, where:
  • Figure 6 A is a top view of a filter assembly
  • Figures 6B, 6C, and 6D are isometric views of the filter assembly of Figure 6A in the closed, open, and filter material removed states, respectively;
  • Figure 6E is a front view of the filter assembly of Figures 6A-6D;
  • Figure 6F is a cross-sectional view taken along line VIF-VIF in Figure 6E;
  • Figure 6G is a rear view of the fi lter assembly of Figures 6A-6F.
  • Figure 6H is a side view of the filter assembly of Figure 6A-6G in the open state.
  • Exemplary embodiments of the invention provide a filtration system for a ventilation hood including a first filter, which drains grease out of the filter, and at least one second filter located either upstream or downstream of the first filter.
  • the first filter is preferably effective at preventing the spread of fire from th e upstream face of the filtration system to an area downstream of the system.
  • the second filter includes filter material sandwiched between two perforated sheets of relatively more rigid material.
  • the first filter may be any filter that drains grease out of the filter, and is preferably also an effective fire barrier.
  • a filter for a ventilation hood that drains grease to a grease drain and is an effective fire barrier is the adjustable ventilator cartridge filter disclosed in U.S. Patent 6,394,083 to Lambertson (the inventor of the present application), and shown in Figure 1.
  • a ventilation hood 1 is disposed above one or more cooking units (not shown).
  • the ventilation hood 1 employs a fan (not shown) to remove the polluted air and exhaust it out of the kitchen, as generally indicated by the curved arrows.
  • a cartridge filter 102 is disposed in the upper rear portion of the ventilator to regulate the air flow through the hood. As seen in Figure 1, the air enters the cartridge filter 102 from one side and exits the filter on the other side in a controlled manner. It is noted that other
  • a grease drain 104 is disposed below the cartridge filter 102.
  • the cartridge filter 102 desirably has a substantially open and unobstructed bottom so that grease does not accumulate inside the cartridge filter 102, but flows to the grease drain 104.
  • the cartridge filter 102 is inclined by about 45°, but other arrangements are possible.
  • the polluted air enters the filter at the topmost arrow and encounters two immediate direction changes forced by the configuration of the walls of the filter. These immediate direction changes start the segmenting of the heavier pollutants from the lighter air.
  • the air flow then enters a high velocity corridor at the second arrow.
  • the entire flow is sped up and then goes through a drastic turn of direction of about 180° at the third arrow.
  • the high rate of air speed and the sudden change in direction facilitate grease extraction.
  • the separated heavier pollutants are unable to follow the lighter air flow around the sudden change of direction at the third arrow.
  • the momentum of the grease carries it to the bottom of the cartridge filter where it impinges with the hood, and then drains into the grease trough provided in the ventilation hood.
  • FIG. 1 Another example of a filter for a ventilation hood that drains grease to a grease drain and is an effective fire barrier is a baffle-type filter, such as that disclosed in U.S. Patent 3,910,782 to Struble et al, the disclosure of which is hereby incorporated by reference.
  • the grease that is filtered by the cartridge filter is drained rather than being stored inside the filter.
  • the cartridge filter is an example of a“non-loading” filter, in that the grease does not load up within it. Therefore, if a fire enters the filter, there is very little grease inside of the filter to serve as fuel.
  • the shape of the cartridge filter is also such that a flame cannot travel through the entire filter.
  • the filter of 6,394,083 and Figure 1 is satisfactory at filtering out grease with a particle size of greater than about 5 micrometers ( ⁇ m), but less effective with smaller particles.
  • embodiments of the present invention further include a second disposable or permanent filter, located either upstream or downstream of the first filter, the second filter being permanently or removably attached to the first filter, or mounted within the hood separately from the first filter.
  • Embodiments of the present invention thus provide a filtration system with both a first and a second filter, where the first filter is a very effective fire barrier, and the second filter is a very effective at entrapping particulates.
  • the resulting combination provides superior performance in both respects.
  • the second filter is made, in part, of fibers, such as natural, synthetic, and/or hybrid fibers, such as, for example and without limitation, wool fibers, wood-based viscose fibers, and cellulose-based synthetic fibers.
  • the second filter is made of organic material, such as natural organic material.
  • the second filter is made of animal-derived organic material, such as wool.
  • the material of the second filter is sandwiched between two perforated sheets of relatively more rigid material. While fiber filters are prized for their particle filtration abilities, their consistency is similar to that of paper towels, and they are known to collapse during use, particularly with age. For this reason, they are not used as often as might be expected given their excellent filtration properties.
  • the present inventor has discovered that by sandwiching the fiber material between two perforated sheets, the problems caused by the consistency can be rectified. In a presently preferred embodiment, the two sheets are placed very close together to squeeze and hold the material between them. In this way, the material remains in place, regardless of how much grease and other particulates it has absorbed.
  • the second filter can be placed either upstream or downstream of the first filter.
  • the second filter is downstream of the first filter. This configuration is similar to that discussed in the parent application and particularly in the embodiments of Figures 2 and 4 therein.
  • the second filter is disposed upstream of the first filter, by being retrofit into an existing hood that already includes a first filter but not a second filter.
  • the second filter is disposed upstream of the first filter, where both filters are retrofit into an existing hood that does not yet include any filters.
  • Figure 2 shows a first example of the second filter being disposed downstream of the first filter.
  • the first filter is a cartridge filter 202 with associated pitched grease tray 203 and grease drain 204
  • the second filter is a fiber, organic, or other filter 206 located downstream of the first filter 202.
  • the second filter 206 is mounted to the first filter 202 at its downstream end, between the air outlet of the first filter and the air outlet of the ventilation hood 2.
  • the second filter may be permanently or removably attached to the first filter, or merely installed in the hood separately.
  • FIG. 2 Also illustrated in Figure 2 are two sheets of perforated material 208, 210, such as metal, one immediately upstream of the fiber filter material 206 and one immediately downstream of the filter material 206.
  • These sheets may each have a cross-section substantially identical in shape and size to the filter material 206, to act as a backing for the filter and sandwich it therebetween. They may be approximately 0.5 mm thick and made, for example, of stainless steel.
  • the perforations may take any number or configuration that can be selected by a person of ordinary skill in the art based on the teachings herein, and may take up, for example, approximately 60% of the total cross-sectional area of the sheet.
  • each perforated sheet can be selected so as to enable efficient flow resistance behavior for the multi-stage filter system, to allow for enhanced grease capture while not adversely impacting the flow resistance of the multi-stage filter system.
  • the perforated sheets can be made of expanded metal, wire screen or mesh, or any other supporting material—preferably non-flammable—that can be selected by a person of ordinary skill in the art based on the teachings herein.
  • these perforated sheets provide resistance to the greasy air flowing through the filter material 206, creating an additional static pressure drop across the filter 206. This distributes the air flow more evenly throughout the filter, thus improving the particle extraction efficiency.
  • polluted air enters the first filter 202, where it is first filtered, and the less- polluted air then enters the second filter 206 with an increased static pressure, and is further filtered there.
  • the clean air then flows through the downstream perforated sheet 210 and exits the ventilation hood 2.
  • Figure 3 shows a second example of the second filter being disposed downstream of the first filter.
  • This embodiment is similar to that illustrated in Figure 4 in the parent application. This differs from the embodiment seen in Figure 2 of this application in that the first filter is a baffle filter 302 rather than a cartridge filter 202.
  • the second filter 306 is again a fiber, organic, or other filter with associated perforated sheets 308, 310.
  • the second filter 306 is mounted within the ventilation hood 3 downstream of the first filter 302, between the air outlet of the first filter and the air outlet of the ventilation hood.
  • the second filter may be permanently or removably attached to the first filter, or installed in the hood separately.
  • FIG. 1 Other embodiments provide the second filter upstream of the first filter. These embodiments are considered particularly suitable when retrofitting an existing hood. Most hoods, whether with or without first filters, have tracks near the upstream end of the hood. (See 212 and 214 in Figure 2, and 312 and 314 in Figure 3.) The present inventor has discovered that these tracks can be used as rails on which to position a filter assembly: either only a second filter (filter material plus perforated sheets) or for hoods that have no filters yet, a second filter integrated with a first filter can be inserted onto the hood and slid on the tracks provided in the hood. The filter assembly can alternatively be attached to the hood by any other appropriate means.
  • FIGs 4A-4L show a second filter 416 integrated with a cartridge filter 402, to provide a filter assembly 400 that can be slid into an existing hood 4 that does not yet have a filter.
  • the first and second filters are removable from one another by the pivoting motion shown in Figure 4H or the sliding motion shown in Figure 4I.
  • the filter material 406 can be removed from between the perforated sheets 408, 410 even when the second filter 416 is attached to the first filter 402, as can be seen in Figures 4A-4C.
  • a latch or clamp 418 keeps the filter material 406 interior the perforated sheets 408, 410 during use. This latch 418 can be undone by hand, and the upstream perforated sheet 408 can be swung open on hinges to provide access to the fiber material 406 for cleaning or replacement.
  • Figure 4L shows the assembly 400 mounted in a hood 4 over cooking equipment 420.
  • a stove 420 is illustrated for exemplary purposes.
  • Figure 5A-5N show a configuration in which the assembly 500 includes a baffle filter 502, rather than a cartridge filter 402, provided as the first filter.
  • the baffle filter 502 can be slid into a track 512, 514 provided on a frame attached to the second filter 516 from the side.
  • the second filter 516 includes filter material 506 sandwiched between perforated sheets 508, 510.
  • a latch 518 keeps the material 506 interior the sheets 508, 510 during use.
  • Figures 5J-5N show the assembly mounted in a hood 5 that did not previously have a filter.
  • Figure 5N shows the hood 5 over cooking equipment 520; a stove 520 is illustrated for exemplary purposes.
  • Figures 6A-6H show a standalone second filter 616 for attachment into a hood (not shown) that already has a first filter (such as a cartridge or baffle filter).
  • This second filter 616 can be inserted as a standalone add-on item, such as by being inserted into the track of the hood to provide additional filtering capabilities.
  • the filter assembly 616 includes filter material 606 sandwiched between perforated sheets 608, 610.
  • the filter assembly 616 also includes a latch 618 to keep the material 606 interior to the sheets 608, 610 during use.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Ventilation (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

L'invention concerne un système de filtration pour une hotte de ventilation comprenant un premier filtre et un second filtre disposés de manière fonctionnelle en série. Le premier filtre est conçu pour être monté à l'intérieur de la hotte de ventilation et comprend une admission d'air, une évacuation d'air et une évacuation de graisse. Le second filtre comprend un matériau filtrant présentant une surface amont et une surface aval, un élément de logement amont venant en butée contre la surface amont du matériau filtrant et un élément de logement aval venant en butée contre la surface aval du matériau filtrant. Les éléments de logement comprennent des ouvertures et maintiennent le matériau filtrant en compression.
PCT/US2015/032018 2014-05-21 2015-05-21 Système de filtration pour hotte à plusieurs étages Ceased WO2015179670A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14/284,350 2014-05-21
US14/284,350 US9732966B2 (en) 2011-01-31 2014-05-21 Multi-stage hood filter system

Publications (3)

Publication Number Publication Date
WO2015179670A2 true WO2015179670A2 (fr) 2015-11-26
WO2015179670A3 WO2015179670A3 (fr) 2016-02-18
WO2015179670A9 WO2015179670A9 (fr) 2016-03-17

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US (2) USD837965S1 (fr)
WO (1) WO2015179670A2 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110131763A (zh) * 2019-04-17 2019-08-16 宁波方太厨具有限公司 一种具有自清洁功能的吸油烟机及其清洁方法
US10512869B2 (en) 2011-01-31 2019-12-24 Streivor, Inc. Multi-stage hood filter system
USD910161S1 (en) 2012-01-31 2021-02-09 Streivor, Inc. Multi-stage filter

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WO2015179670A3 (fr) 2016-02-18
USD910161S1 (en) 2021-02-09
USD837965S1 (en) 2019-01-08

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