WO2018078426A1

WO2018078426A1 - One-way exhaust hood

Info

Publication number: WO2018078426A1
Application number: PCT/IB2016/056548
Authority: WO
Inventors: Pejman AKBARI
Original assignee: Akbari Pejman
Priority date: 2016-10-31
Filing date: 2016-10-31
Publication date: 2018-05-03

Abstract

The invention is "One-Way Exhaust Hood". It relates to human necessities subfields domestic articles and life-saving. It's an apparatus for solving the life-threatening problem i.e. "reverse flow of fume of indoor gas burner in effect of wind". It consists of a Tee canal with two exit paths and a rotating assembly that rotates clockwise and counter clockwise inside the apparatus to switch paths from open to closed and vice versa.The wind closes the same side path to block the way in. This consequently opens the opposite side path to conduct the fume out. Both exits are never shut simultaneously.

Description

" One-Way Exhaust Hood Technical field

0001 It relates to human necessities , subfields domestic articles and life-saving . Background art

0002 Different kinds of prior art such as chamber hood , helmet like hood and H-type hood (figurel ,A-C) have no sufficient mechanism for blocking the inward air flow which is caused by wind that blows to the outdoor hood of indoor gas burner specially when it is installed on side wall of building . When the wind hits the conventional exhaust hood , it penetrates inside the hood and consequently reverse flow of fume occurs in windy conditions .

Disclosure of invention

0003 The existing problem relates to the safety of emitting the emissions of indoor fl ued gas burner in windy conditions .When the wind hits the exhaust hood , it penetrates inwards through the outlet of flue and consequently causes a reverse flow of fume which is toxic and life threatening There is no mechanism in conventional kinds of exhaust hood for blocking the inward wind.

0004 On the other hand the out way must remain open constantly for fume discharge . Hence the invented hood is designed to turn the primary exit path into two contralateral exit paths so that the active part of the apparatus can manage differently on each path, shutting one and opening the other. The solution is based on the mechanism of instant reaction to the wind by minor rotation of the functional part of the apparatus that switches between gates built in the apparatus. When the wind hits the invented hood , it closes the prior path and opens the latter simultaneously.

0005 The apparatus is designed to react to the least amount of air movement by balancing the rotating assembly around its axis of rotation , elongating the effort arm(65) of the active part, minimising the diameter of the axis of rotation , m inimising the scope of rotation (826) , minimising the friction of contact surfaces and lightening the moving components .

0006 Further more by these facilities the function of apparatus do not depend on direction of installation . It means that it is not necessary to be i nstalled exactly in upright position .

0007 The outcome is constant confident outflow of fume free of any reverse flow . Brief description of drawings

0008 Figu re 1: Three kinds of conventional exhaust hood (prior art) , A: Chamber hood, B: Helmet hood , C: H type hood (CAD drawing) .

Figure 2: Frontal elevation view of the invention , 215: Retainer cap .

Figure 3: Top view of the invention with selected section of the body in ab line, 39: Axial bar of rotating assembly, 37: Distal transverse bar ,319: I nternal stop for insertion of the outlet of flue.

Figure 4: Medial (mid-sagittal) section of proximal part of the invented apparatus on cd line (scale2.3/l), 49 : Axial bar of the connecting arm of the rotating assembly, 411: Proximal balancing weight 413: Axial pin (The axis of rotation of rotati ng assembly), 415 : Retainer cap for retaining the axial pin , 419 : Internal stop for insertion of the outlet of flue .

Figure 5: Alternative embodiment for retainer cap and axial pin in the same view as in figure 4 , indicating pin-cap assembly 524: Pin-cap assembly , 59: Axial bar .

Figure 6: Exploded view of the invention with selected section of the body in mid-frontal plane ,

61: Body , 62 : Transverse canal of the body , 63: Longitudinal canal of the body , 64: Rotating assembly ,fully assembled , 65: Connecting arm of the rotating assembly ,66 : Longitudinal bar of the connecting arm 67 : Distal transverse bar of the connecting bar 68 : Proximal transverse bar of the connecting bar , 69 : Axial bar of the connecting arm , 610 : Bonnets of the rotating assembly , 611: Proximal balancing weight, 612 : Right and left balancing weights on the proximal transverse bar , 613: Axial pin(scale 4/1) ,614: Right and left funnels , 615: Retentive cap (scale 5/1), 616: Clamp , 617 :Two gates inside the transverse canal , 618 : The bevel cut on both ends of transverse bar .

Figure 7 : The deviation of axis of the funnel toward proximal side of apparatus , 720 : Bevel cut on narrow neck of the funnel , 721 : Longitudinal axis of the funnel in position .

Figure 8 : Cross section view of the invention indicating the path of discharge of fu me (The rotating assembly is shifted to right ) , 826: The scope of rotation , 812: Right and left balancing weights.

Figure 9 : Side elevation view of the invention , 915 : Retainer cap , 916 :Clamp, 925: Axis line of rotation of rotating assembly (826) .

Figure 10 : The installation status of the invention on juxtaposed wall , 1022 : Outdoor outlet of flue of indoor gas burner , 1023 : External wall of the building . Description of embodiments

0009 The invention is an apparatus configured of a body (61) a rotating assembly (64) , and several accessory parts .

0010 The body is a Tee canal configured of a longitudinal canal (63) on proximal side and a transverse canal (62) on distal side attached and sealed together for tu rning primary exit path into two contralateral paths and holding other parts of apparatus .

0011 The longitudinal canal (63) has two openings . The proximal opening to be installed on installation site on the wall of the building e.g. outdoor outlet of indoor gas bu rner(1022) and distal opening to be attached to the transverse canal.

0012 There are several grooves on proximal edge of the longitudinal canal to let it be constricted by means of a clamp (616) and secured on installation site (1022) .

0013 There are two perforations on frontal and dorsal walls of the longitudinal canal to let a pin (413) pass across the longitudinal canal which forms the axis of rotation of the rotating assembly and is perpendicular to frontal plane of the apparatus his axis of rotation is also located on medial (mid-sagittal) plane of the apparatus The position of the axis (925) makes the rotating assembly able to rotate parallel to the frontal plane of the transverse canal in determined scope of rotation (826) and makes bonnets sit exactly on embedded gates (617) inside the transverse canal .

0014 There are two separate stops (319/419) on i nternal walls of proximal part of the longitudinal canal in a distance with the proximal edge , to limit the coupling (e.g. 1022) enter the apparatus at the time of installation, for preventing interaction with rotating assembly They can be inward extensions of the body , buttons , screws , rivets or welded pieces of metal .

0015 The transverse canal (62) has two open ends on right and left and an opening at the middle which receives the distal end of the longitudinal ca nal. There are two proximal bevels on right and left ends of the transverse canal to prevent accumulation of snow and blockage of exits .

0016 The transverse canal is divided to th ree chambers by two perforated plates (617), limited to the internal surface of the transverse canal , positioned on two sagittal planes on right and left sides of middle opening with equal distance to medial (mid-sagittal) plane of apparatus, providing two gates for outgoing fume (outgoing air flow).

0017 The rotating assembly (64) consists of two reciprocal bonnets (610), a connecting arm (65) and three balancing weights (611 and 612) .

0018 The connecting arm consists of a longitudina l bar (66), a distal transverse bar (67) a proximal transverse bar (68) ,and an axial bar (69).Two transverse bars are parallel and perpendicular to the longitudinal bar The axial bar is positioned in mid-sagittal plane of the apparatus in line with axis line(925) and perpendicular to the longitudinal bar and the transverse bars . The bars and canals can be round, rectangular or oval . 0019 The longitudinal bar(66) is the basic bar of the connecting arm(64) The distal transverse bar(67) is a bar attached at its middle to the distal end of longitudinal bar and perpendicular to it . There is a bevel cut (618) on each end of the distal transverse bar ( the surface for attaching the bonnets ) to compensate the angle between the perforated plate (617) and the back of the bonnet in closed status because of the tilt of rotating assembly at the end of the scope of rotation (826) . The bevel cut makes the bonnets match completely on the gates . The proximal transverse bar (68) crosses at its centre the longitudinal bar in a distance with the proximal end of the longitudinal bar and is perpendicular to longitudinal bar and parallel to the distal transverse bar .The axial bar (69) crosses at its centre the longitudinal bar at the same point of crossing of the proximal transverse bar and is perpendicular to the longitudinal bar and the proximal transverse bar here is a round cut along the centre line of the axial bar. A metal pin (613) is passed through said cut and reciprocal said foramens on the longitudinal canal to act as axis of rotation of the rotating assembly.

0020 Two balancing weights (612) are attached to the right and left ends of the proximal transverse bar with equal distance to the longitudi nal bar for neutralising the tendency of rotating assembly for positioning horizontally along its longitudinal bar .

0021 Another balancing weight (611) is attached to the proximal end of the longitudinal bar for neutralising the torque of distal part of rotating assembly , beyond the axis of rotation according to the rule of levers ( Fl x Dl = F2 x D2 ) ( F stands for the force/weight and D stands for the distance to the axis/fulcrum).

0022 Balancing weights are responsible for balancing the rotating assembly to let it rotate freely with no tendency to any direction by itself This makes the apparatus able to react properly to the least amount of air movement.

0023 Two reciprocal bonnets (610) with the same shape , size and weight are attached at the centre of their backside to the both ends of the distal transverse bar of the connecting arm in equal distance to the centre of the bar by means of welding , screw , rivet or any attaching means so that when rotating assembly rotates inside the apparatus ,the back of one bonnet completely sits on embedded gate in the transverse canal (617) to shut the same side path and the opposite bonnet moves away from the opposite gate to open it for fume discharge (figure 8). The gates are never closed both together The bevel cuts(618) on both ends of the distal transverse bar, equal to the half of the degree of rotation of the rotating assembly make the back of bonnets sit exactly on gates in transverse canal at the end of scope of rotation (826).

0024 There are several accessory parts in the apparatus as follows :

0025 A metal pin (413/613) passes through a cou ple reciprocal foramens of the longitudinal canal and the round cut of axial bar of rotating assembly , holds the rotating assembly in position and acts as the axis of rotation of the rotating assembly . 0026 Two retainers retain the axial pin(413) in its position inside the longitudinal canal so that the pin can rotate freely in the body foramens on frontal and dorsal walls . The retainers can be washers fixed on both ends of the pin or caps (615)attached by screw , rivet or welding and sealed by a sealant or rubber washer between the cap and the body of apparatus , non-fixed on the pin.

0027 Alternatively the axial pin can be configu red of two separate pins each permanently attached to the internal surface of a retainer cap and perpendicular to it, forming a pin-cap assembly (524) so that the pin is inserted to each side of round cut of axial bar of rotating assembly non-fixed in it and the cap is fixed with screws on couple foramens on frontal and dorsal walls of the longitudinal canal and sealed on the body by rubber washer or glue or any sealant ,to act as axis of rotation of rotating assembly that is adjustable by loosening screws , manual adjustment of the said assembly and tightening back the screws for minor adjustment of rotating assembly at the time of manufacturing and also act as cover for foramens to prevent inward penetration of water.

0028 A clamp (616) around the proximal end of the longitudinal canal to constrict it and secu re the apparatus on the site of installation .

0029 Two uniform asymmetric funnels (614) inside the transverse canal on right and left sides of the middle opening so that the wide neck is attached to the internal surface of the transverse canal by welding, screw, rivet or any attaching means and narrow neck positioned medially to focus the inward wind on the bonnets . There is a bevel cut (720) on distal side of the narrow neck of the funnel and a deviation in the axis of the funnel to proximal side (721) as showed in figu re 7 .The centre of narrow neck is positioned proximally rather to the centre of wide neck of the funnel .

0030 Two pieces of net mesh at the entrance of both sides of the transverse canal hinder birds and beetles entering the apparatus .

0031 Generally when the wind hits the invented hood from right or left (only ways to exchange air) it acts directly on the bonnet of the same side and closes the prior gate. This blocks the inward flow and also indirectly moves the opposite bonnet and opens the opposite gate for safe discharge of fume . Blowing the apparatus from both sides at the same moment is what that never happens .

Industrial applicability

0032 The apparatus is made by domestic appliance industry , and is used as outdoor exhaust hood for indoor flued gas heater , water warmer and fireplace to prevent reverse flow of fume caused by adverse wind .

0033 Also it can be used as overhead exhaust hood on outlet of any kind of vent on buildings such as kitchen hood and powerhouse vent to block inward air flow and provide one-way outgoing current.

Claims

Claims :

Claim 1: An apparatus for preventing reverse flow of fume of indoor flued gas burner by blocking the inward air caused by wi nd , comprising : a means for holding components of apparatus , restricting the exit path of fume and turning the primary exit path into two contralateral paths for d ifferent manoeuvre on each one , named holding means in this claim ; a means for reacting instantly against inward wind and switching between two contralateral exit paths of fume by rotating clockwise and counter clockwise due to the wind direction, shutting the same side path and opening the opposite side path at the same time , named rotating means in this claim ; a metal pin configured as axis of rotation of the rotating means passed across both the holding means and the rotating means ; two retainer caps attached and sealed to the holdi ng means , covering two ends of the pin for retaining the pin in position and preventing inward penetration of water ; two uniform asymmetric funnels embedded in every exit path of the holding means , configured to focus the wind on the rotating means ; and a clamp around the holding means for securing the apparatus on installation site .

Claim 2: The apparatus of claim 1 , wherein the rotating means is balanced around its axis of rotation by means of balancing weights embedded in the rotating means , to make the rotating means able to rotate freely without any tendency to a particular direction by itself .

Claim 3 : An apparatus for preventing reverse flow of fume of indoor flued gas burner by blocking the inward air caused by wind , comprising : a Tee canal configured of a transverse canal with two open ends , a middle opening on proximal side and two perforated plates(617) attached and sealed to the internal wall of the transverse canal on right and left sides of the middle opening with equal distance and parallel to the virtual medial plane (mid-sagittal plane) of the transverse canal , and a longitudinal canal with a distal open end to be attached and sealed to middle opening of the transverse canal and a proximal open end to be installed on installation site of apparatus ; a rotating assembly configured of a longitudinal bar(66), a distal transverse bar(67) permanently attached at its middle to the distal end of the longitudinal bar and perpendicular to it , a proximal transverse bar(68) crossed at its middle the longitudinal bar in a distance with proximal end of the longitudinal bar, perpendicular to longitudinal bar and parallel to distal transverse bar , an axial bar (69) crossed at its middle the longitudinal bar at the same point of crossing of the proximal transverse bar with longitudinal bar, perpendicular to both the longitudinal bar and the proximal transverse bar ,with a central round cut through all along for passing a pin as axis of rotation of the rotating assembly , two reciprocal uniform bonnets(610) with equal weight , attached at centre of their backside to centre of two ends of the distal transverse bar by means of attaching means with equal distance to the middle of the distal transverse bar , a balancing weight(611) attached to the proximal end of the longitudinal bar for neutralising the torque of distal part of rotating assembly beyond the axis of rotation , and two equal balancing weights(612) attached on both ends of the proximal transverse bar with equal distance to the longitudinal bar for neutralising the tendency of the rotating assembly for positioning horizontally along the longitudinal bar ; a metal pin(413) passed through a round cut all along the axial bar of the rotating assembly at the centre of the axial bar and two reciprocal foramens of frontal and dorsal walls of the longitudinal canal , as axis of rotation of the rotating assembly ; two retainer caps(615) attached by means of attaching means and sealed by rubber washer or a sealant on frontal and dorsal walls of the longitudi nal canal , covering two ends of the axial pin for retaining the axial pin in position and preventing i nward penetration of the water ; two uniform asymmetric funnels(614) attached by its wide neck to the internal walls of the transverse canal on right and left sides of the middle opening of the transverse canal, in equal distance to medial plane of the transverse canal and the narrow neck positioned medially ; and a clamp(616) around the proximal part of the longitudinal canal to constrict it and secure the apparatus on installation site .

Claim 4 : The apparatus of claim 3 , wherein the Tee canal and the rotating assembly is completely symmetric on its right and left sides about the mid-sagittal plane of the same said component and symmetric on its frontal and dorsal sides about the mid-frontal plane of the same said component . Claim 5 : The apparatus of claim 3 , wherein the rotating assembly is balanced proximal to distal about its axis of rotation by means of a balancing weight attached to the proximal end of the longitudinal bar in a distance to the axial bar that neutralises the torque of the distal part of the rotating assembly beyond the axial bar according to the rule of levers, for making the rotating assembly able to rotate freely without any tendency to a particular direction .

Claim 6 : The apparatus of claim 3 , wherein two equal weights with equal shape are attached to the right and left ends of the proximal transverse bar of the rotating assembly with equal distance to the longitudinal bar for eliminating the tendency of the rotating assembly for positioning horizontally along the longitudinal bar .

Claim 7 : The apparatus of claim 3 , wherein the axis of rotation of rotating assembly is positioned on virtual medial (mid-sagittal) plane of the apparatus and perpendicular to the vi rtual frontal (coronal) plane of the apparatus .

Claim 8 : The apparatus of claim 3 , wherein the scope of rotation of the rotating assembly (826) is limited by two said perforated plates(617) inside the transverse canal that provide two gates for fume discharge.

Claim 9 : The apparatus of clai m 3 , wherein the centre of narrow neck of the funnel is positioned proximally rather than the centre of wide neck of the funnel to match the narrow neck of the funnel with the bonnet of the rotating assembly at the end of its rotation to the side .

Claim 10 : The apparatus of claim 3 , wherein the fu nnel has a bevel cut on distal side of the narrow neck of the funnel for match ing the narrow neck with the tilt of the bonnet of the rotating assembly at the end of its rotation to the side .

Claim 11 : The apparatus of claim 3 , wherein several longitudinal grooves are on the edge of proximal end of the longitudinal canal to make it able to be constricted by means of the clamp and secured on installation site at the time of installation .

Claim 12 : The apparatus of claim 3 , wherein right and left open ends of the transverse canal is covered by two pieces of net mesh for hindering bi rds and beetles .

Claim 13 : The apparatus of claim 3 , wherein the proximal wall of the transverse canal has two foramens on right and left sides , positioned medially to the funnels , for discharging any water inserted in the apparatus . Claim 14 :The apparatus of claim 3 , wherein the axis of rotation of the rotating assembly is alternatively configured of two separate pins ,each permanently attached to internal surface of a retainer cap and perpendicular to it , forming a pin-cap assembly(524) , inserted into both sides of the round cut of the axial bar of the rotating assembly , non-fixed in it and fixed with screws on frontal and dorsal walls of the longitudinal canal and sealed on the body by a rubber washer or a sealant , for making it adjustable by loosening the screws , manual adjustment of the pin-cap assembly and tightening back the screws at the ti me of manufacturing , for possibility of minor adjustment of the rotating assembly and preventi ng inward penetration of water.

Claim 15 : The apparatus of any of claims 1 or 3, wherein each of the components of the apparatus is divided into any combination of subcomponents that provide the same recited function of the same component of the apparatus .

Claim 16 : The apparatus of any of claims 1 or 3, wherein each of the components of the apparatus has any shape that provide the same recited function of the same component of the apparatus .

Claim 17 : The apparatus of any of claims 1 or 3, wherein the whole apparatus has any shape , colour and surface textu re that provides the same recited function of the apparatus .

Claim 18 : The apparatus of any of claims 1 or 3 , in which the components of the apparatus are made of metal.

Claim 19 : The apparatus of any of claims 1 or 3 , in which the components of the apparatus are made of high temperature plastic .

Claim 20 :The apparatus of any of claims 1 or 3 , in which the components of the apparatus are made of plastic coated metal .

Claim 21 :The apparatus of any of claims 1 or 3 , in which the apparatus has a combination of metal components and high temperature plastic components .

Claim 22 : The apparatus of any of claims 1 or 3 , wherein the clamp is fastened by means of built-in handle that is tightened by fingers of user .

Claim 23 : The apparatus of any of claims 1 or 3 , is applicable on the outdoor outlet of indoor flued gas heater, water warmer, fireplace, kitchen hood, powerhouse and any vent on side wall of building and on top of the roof as one-way exhaust hood.