US20110086589A1 - Outdoor communication cabinet including fan tray and filter and method of detecting blockage of communication cabinet filter - Google Patents
Outdoor communication cabinet including fan tray and filter and method of detecting blockage of communication cabinet filter Download PDFInfo
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- US20110086589A1 US20110086589A1 US12/904,270 US90427010A US2011086589A1 US 20110086589 A1 US20110086589 A1 US 20110086589A1 US 90427010 A US90427010 A US 90427010A US 2011086589 A1 US2011086589 A1 US 2011086589A1
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 230000002093 peripheral effect Effects 0.000 claims description 14
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- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims 3
- 230000000717 retained effect Effects 0.000 claims 2
- 238000007792 addition Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 229920000295 expanded polytetrafluoroethylene Polymers 0.000 description 2
- 230000002209 hydrophobic effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000013618 particulate matter Substances 0.000 description 2
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- 241001465754 Metazoa Species 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
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- 238000010276 construction Methods 0.000 description 1
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- 238000012217 deletion Methods 0.000 description 1
- 230000037430 deletion Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000002028 premature Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
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- 238000012552 review Methods 0.000 description 1
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
- H05K7/20172—Fan mounting or fan specifications
Definitions
- the present invention is directed toward an improved outdoor communication cabinet for housing heat-producing electronic equipment that includes a fan tray and a filter and toward a method of detecting blockage of a communication cabinet filter, and, more specifically, toward an outdoor communication cabinet for electronic equipment that includes a door-mounted fan tray, a door-mounted filter for filtering air drawn into the cabinet by fans in the fan tray and a controller for controlling the fans and for detecting blockage of the filter.
- Outdoor cabinets for electronic and/or telecommunication equipment and connection panels are known in the art.
- the equipment in these cabinets generally must be maintained within a certain temperature range in order to function properly, and some of this equipment generates heat that must be dissipated.
- Direct air cooling is a common method for removing excess heat from such cabinets, especially when the equipment in the cabinet generates a relatively large amount of heat.
- vents are also provided for allowing heat to escape from the cabinet interior and for allowing an air flow to pass through the cabinet over and around the equipment, which air flow may be produced or assisted by one or more fans.
- Screens or filters may also be provided to reduce the amount of particulate matter that finds its way into the cabinet interior, and any vent openings may be louvered to protect the cabinet interior from rain.
- Another aspect of the invention comprises a method of detecting a degree of blockage of a filter in an outdoor communication which cabinet which includes a housing and at least one fan for driving air into the housing and a filter for filtering the air driven into the housing by the at least one fan.
- the method includes providing a sensor in the housing that provides an output based on a sensed pressure of the housing.
- the method also includes determining a first level of the output when the at least one fan is in a first state and determining a second level of the output when the at least one fan is in a second state. A relationship is determined between the first level and the second level and a signal is generated when the relationship satisfies a predetermined condition.
- a further aspect of the invention comprises an outdoor communication cabinet that includes a housing with a interior and first and second openings into the interior.
- a door is connected to the housing at the first opening, and a fan tray, including a plurality of fans, is connected to the door.
- a damper is mounted at the second opening for regulating air flow through the second opening, and a controller is operatively connected to the plurality of fans and to the damper for controlling operation of the plurality of fans and a position of the damper.
- Yet another aspect of the invention comprises a method of detecting a degree of blockage of a filter in an outdoor communication cabinet.
- the cabinet includes a housing having an interior with first and second openings into the interior, and a door is connected to the housing at the opening.
- the door includes an aperture, and a fan tray including a plurality of fans is hingedly connected to the door for movement between first and second positions relative to the first aperture.
- the filter is mounted to the door over the aperture on a side of the first fan tray opposite from the interior.
- a damper is mounted at the second opening for regulating air flow through the second opening, and a controller is operatively connected to the plurality of fans and to the damper for controlling operation of the plurality of fans and a position of the damper.
- FIG. 1 is perspective view of an outdoor communication cabinet according to a first embodiment of the present invention, the door of the cabinet being shown in a partially open state.
- FIG. 2 is a perspective view of the rear side of the door of FIG. 1 and a fan box mounted thereto.
- FIG. 4 is a rear elevational view of a modified version of the door of FIG. 2 .
- FIG. 5 is perspective view of the rear side of door of FIG. 2 showing an embodiment of the present invention that includes two fan boxes.
- FIG. 6 is a perspective view of the door of FIG. 2 showing the fan box pivoted away from the door on a hinge.
- FIG. 7 is a perspective view of the door of FIG. 2 showing the fan box pivoted away from the door and showing a first air filter partially removed from the fan box.
- FIG. 8 is an exploded perspective view of the door of FIG. 2 showing a first air filter, a second air filter and a fan tray.
- FIG. 9 is a sectional side elevational view taken along line IX-IX in FIG. 2 .
- FIG. 10 is a flow chart illustrating a method according to an embodiment of the invention.
- spatially relative terms such as “under”, “below”, “lower”, “over”, “upper”, “lateral”, “left”, “right” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the descriptors of relative spatial relationships used herein interpreted accordingly.
- FIG. 1 A cabinet 10 according to an embodiment of the present invention is illustrated in FIG. 1 and includes a housing 12 having an opening 14 into an interior 16 in which electronic or communication equipment (not illustrated) is housed.
- a door 18 is mounted by opening 14 and is connected to the housing by a hinge 20 for allowing access to interior 16 when open and for protecting the contents of the housing from the elements and unauthorized individuals when closed and, optionally, locked.
- Door 18 includes an outer panel 22 having a plurality of vent openings 24 covered by screens 26 and an inner panel 28 illustrated in FIGS. 2 , 3 and 4 .
- Inner panel 28 includes either a single aperture 30 divided into first and second apertures 32 , 34 by a cross member 36 as illustrated in FIG. 4 , or first and second individual apertures 38 and 40 as illustrated in FIG. 3 .
- a space 42 between the outer panel 22 and the inner panel 28 provides sound and heat insulation and accommodates part of a fan box 44 described hereafter.
- second aperture 34 or second aperture 40 is sealed off by a removable panel 46 mounted thereover as illustrated, for example, in FIG. 2 .
- a second fan box 44 ′ can be mounted in second aperture 34 or second aperture 40 as illustrated in FIG. 5 .
- Embodiments of the invention using a door 18 having first and second apertures 38 , 40 will be discussed herein, it being understood that a door 18 having a single aperture divided into first and second apertures 32 , 34 could be used in a similar manner.
- fan box 44 comprises a frame 48 defining an interior 49 and having a first side portion 50 , a second side portion 52 , a front side 54 facing in the direction of door outer panel 22 and a rear side 56 facing in the direction of interior 16 when door 18 is closed.
- First side portion 50 is connected to inner panel 28 next to first aperture 40 by a hinge 58 , illustrated in FIG. 5 , allowing fan box 44 to pivot away from first aperture 38 as illustrated in FIGS. 6 and 7 .
- Second side portion 52 includes a removable retainer 60 which is described hereinafter.
- a first peripheral wall 62 extends around interior 49 of the fan box near front side 54
- a second peripheral wall 64 extends around interior 49 of the fan box, spaced from first peripheral wall 62 in the direction of fan box rear side 56 .
- a first filter 66 is mounted in a space 68 between first peripheral wall 64 and second peripheral wall 64 , and space 68 is selected based on the size of the filter to be used to provide a snug fit for the filter so that substantially all air passing through fan box 44 must pass through first filter 66 .
- First filter 66 is inserted into space 68 through a side entrance 70 , illustrated in FIG. 7 , which is selectively covered by retainer 60 and secured by suitable fasteners such as screws (not illustrated).
- Retainer 60 is configured to seat tightly against the first filter 66 to substantially prevent air passing through the fan box from circumventing the first filter 66 .
- First filter 66 may comprise a disposable filter or a reusable filter, and reusable filters sold under the brand name QUADRAFOAM by the Universal Air Filter Company of Sauget, Ill. have been found to be suitable for this application.
- a second filter 72 is mounted on the side of second peripheral wall 64 opposite first filter 66 and is held against the second peripheral wall 64 by a fan tray 74 mounted on the rear side 56 of the fan box 44 .
- Second filter 72 comprises a hydrophobic filter configured to substantially prevent the passage of particulate matter that is not trapped by first filter 66 and likewise to substantially prevent water from entering cabinet 10 through fan box 44 .
- a suitable hydrophobic filter is an ePTFE (Expanded Polytetrafluoroethylene) based filter available from W. L. Gore & Associates.
- Second filter 72 will generally be more expensive than first filter 66 , but because second filter 72 filters air that has already been filtered by first filter 66 , it will require less frequent cleaning or replacement. Second filter 72 , as illustrated in FIG.
- Fan tray 74 comprises a panel 80 having a first side 82 facing second filter 72 and a second side 84 facing housing interior 16 when door 18 is closed.
- a plurality of fans 86 are mounted in openings in panel 80 and connected to a suitable controller 88 , illustrated in FIG. 10 , that provides fans 86 with power and that controls the activation state and speed of the fans.
- Controller 88 may be connected to fan tray 74 in any conventional manner such as via a wire or cable (not illustrated) that extends from the controller to the fan tray 74 across door hinge 20 .
- a gasket 90 is mounted on first side 82 of panel 80 for forming a substantially air-tight seal with the interior 49 of fan frame 46 and pressing against second flange 78 of second filter 72 when the fan tray 74 is mounted on the fan box 44 .
- a pressure sensor 92 is mounted on second side 84 of panel 80 and operatively connected to controller 88 , and a temperature sensor 94 in housing 12 is also operatively connected to controller 88 .
- first filter 66 and second filter 72 for cleaning or replacement and the removal of fan tray 74 for repair will now be described.
- door 18 is opened to expose fan box 44
- second side portion 52 of fan box frame 44 is removed from first aperture 38 by pivoting the fan box 44 about hinge 58 to expose removable retainer 60 .
- Retainer 60 is removed by loosening screws (not illustrated) to expose first filter 66 , and the first filter 66 can be slid out from between first peripheral wall 62 and second peripheral wall 64 and cleaned or replaced.
- the cleaned or new first filter 66 is then reinserted in space 68 as previously described, retainer 60 is replaced and secured, and fan box 44 is pivoted back into first aperture 38 as shown, for example, in FIG. 2 .
- Fan tray 74 is mounted to rear side 56 of fan box frame 48 , and is readily accessible when door 18 of cabinet 10 is opened. If fan tray 74 or one or more fans 86 on the fan tray 74 require service, they can be directly accessed by opening cabinet door 18 . Alternately, fan tray 74 can be removed and replaced with a new fan tray when it is preferable to quickly return the cabinet 10 to service and troubleshoot the defective fan tray at a service facility rather than in the field.
- An exit opening 96 is provided on a wall of housing spaced from door 18 , such as rear wall 98 illustrated in FIG. 10 .
- Exit opening 96 allows air drawn into housing 12 by fans 86 to leave the housing, taking with it much of the heat produced by equipment operating inside the cabinet 10 .
- Exit opening 96 is selectively blockable by a damper assembly 100 which includes first and second flaps 102 which can be pivoted or otherwise moved between a closed position illustrated in FIG. 10 to an open position, not illustrated, that allows a relatively free flow of air from the interior of the housing 12 .
- An actuator 104 operatively is operatively connected to the controller 88 and to the first and second flaps 102 and positions the first and second flaps 102 based on signals from the controller 88 .
- Dashed line 106 illustrates the position of a vented cover (not illustrated for clarity) that fits over damper assembly 100 to keep animals and insects out of the housing 12 and to minimize the entry of rain.
- a method of determining when first filter 66 and/or second filter 72 needs service is also possible with the cabinet 10 described above.
- a first pressure reading is taken by pressure sensor 92 when the fans 86 are in a first operating state, such as off.
- the fans 86 are then driven at a set speed, such as 60% of their maximum operating speed, and a second pressure reading is taken.
- the difference between these readings is compared to a predetermined value, and if the difference is less than the predetermined value, a signal is generated by controller 88 to indicate that the filters are at least partially blocked and require service.
- the predetermined amount may be established from baseline readings taken when first filter 66 and second filter 72 are new.
- first and second fan operating states can be selected for performing the above test, such as 10 percent of maximum operating speed for the first state and 80 percent of maximum operating speed for the second test.
- a second state that is low enough, such as the 60% of maximum operating speed described above, to avoid the production of excessive turbulence inside the housing which can make it difficult to obtain an accurate pressure reading.
- a method related to the above method is illustrated in the flow chart of FIG. 11 which includes a step 110 of providing a sensor in an outdoor communications cabinet housing configured to provide an output based on a sensed pressure of the housing, a step 112 of determining a first level of the output when the at least one fan in the housing is in a first state, a step 114 of determining a second level of the output when the at least one fan is in a second state, a step 116 of determining a relationship between the first level and the second level, and a step 118 of generating a signal when the relationship satisfies a predetermined condition.
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- Cooling Or The Like Of Electrical Apparatus (AREA)
Abstract
Description
- The present application claims the benefit of U.S. Provisional Patent Application No. 61/251,506 filed Oct. 14, 2009, the entire contents of which is hereby incorporated by reference.
- The present invention is directed toward an improved outdoor communication cabinet for housing heat-producing electronic equipment that includes a fan tray and a filter and toward a method of detecting blockage of a communication cabinet filter, and, more specifically, toward an outdoor communication cabinet for electronic equipment that includes a door-mounted fan tray, a door-mounted filter for filtering air drawn into the cabinet by fans in the fan tray and a controller for controlling the fans and for detecting blockage of the filter.
- Outdoor cabinets for electronic and/or telecommunication equipment and connection panels are known in the art. The equipment in these cabinets generally must be maintained within a certain temperature range in order to function properly, and some of this equipment generates heat that must be dissipated. Direct air cooling is a common method for removing excess heat from such cabinets, especially when the equipment in the cabinet generates a relatively large amount of heat. In such systems, vents are also provided for allowing heat to escape from the cabinet interior and for allowing an air flow to pass through the cabinet over and around the equipment, which air flow may be produced or assisted by one or more fans. Screens or filters may also be provided to reduce the amount of particulate matter that finds its way into the cabinet interior, and any vent openings may be louvered to protect the cabinet interior from rain.
- These outdoor cabinets may require periodic inspection to determine whether filters require replacement and whether the fan or fans in the cabinet are working properly. Filters that have become blocked may reduce air flow through the cabinet sufficiently that equipment in the cabinet overheats and malfunctions and may also lead to premature fan failure which further reduces the cooling capacity of the cabinet. It would therefore be desirable to determine automatically when a filter has become blocked and to mount one or more filters and the fan or fans in a manner that facilitates service and/or replacement when necessary and to permit scaling of the cooling system as need by the addition, deletion or changing of equipment in the cabinet.
- These problems and others are addressed by embodiments of the present invention, a first aspect of which comprises an outdoor communication cabinet having a housing with a interior and an opening into the interior. A door is connected to the housing at the opening and includes a first aperture. A first fan tray, including a plurality of fans, is hingedly connected to the door for movement between first and second positions relative to the first aperture.
- Another aspect of the invention comprises a method of detecting a degree of blockage of a filter in an outdoor communication which cabinet which includes a housing and at least one fan for driving air into the housing and a filter for filtering the air driven into the housing by the at least one fan. The method includes providing a sensor in the housing that provides an output based on a sensed pressure of the housing. The method also includes determining a first level of the output when the at least one fan is in a first state and determining a second level of the output when the at least one fan is in a second state. A relationship is determined between the first level and the second level and a signal is generated when the relationship satisfies a predetermined condition.
- A further aspect of the invention comprises an outdoor communication cabinet that includes a housing with a interior and first and second openings into the interior. A door is connected to the housing at the first opening, and a fan tray, including a plurality of fans, is connected to the door. A damper is mounted at the second opening for regulating air flow through the second opening, and a controller is operatively connected to the plurality of fans and to the damper for controlling operation of the plurality of fans and a position of the damper.
- Yet another aspect of the invention comprises a method of detecting a degree of blockage of a filter in an outdoor communication cabinet. The cabinet includes a housing having an interior with first and second openings into the interior, and a door is connected to the housing at the opening. The door includes an aperture, and a fan tray including a plurality of fans is hingedly connected to the door for movement between first and second positions relative to the first aperture. The filter is mounted to the door over the aperture on a side of the first fan tray opposite from the interior. A damper is mounted at the second opening for regulating air flow through the second opening, and a controller is operatively connected to the plurality of fans and to the damper for controlling operation of the plurality of fans and a position of the damper. The method includes providing a pressure sensor in the housing configured to provide an output based on a sensed pressure of the housing and connecting the pressure sensor to the controller. The method also includes determining a first level of the output when the at least one fan is in a first state, determining a second level of the output when the at least one fan is in a second state, determining a relationship between the first level and the second level, and generating a signal when the relationship satisfies a predetermined condition.
- These and other aspects and features of the invention will be better understood after a reading of the following detailed description together with the attached drawings, wherein:
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FIG. 1 is perspective view of an outdoor communication cabinet according to a first embodiment of the present invention, the door of the cabinet being shown in a partially open state. -
FIG. 2 is a perspective view of the rear side of the door ofFIG. 1 and a fan box mounted thereto. -
FIG. 3 is a rear elevational view of the door ofFIG. 2 with the fan box removed. -
FIG. 4 is a rear elevational view of a modified version of the door ofFIG. 2 . -
FIG. 5 is perspective view of the rear side of door ofFIG. 2 showing an embodiment of the present invention that includes two fan boxes. -
FIG. 6 is a perspective view of the door ofFIG. 2 showing the fan box pivoted away from the door on a hinge. -
FIG. 7 is a perspective view of the door ofFIG. 2 showing the fan box pivoted away from the door and showing a first air filter partially removed from the fan box. -
FIG. 8 is an exploded perspective view of the door ofFIG. 2 showing a first air filter, a second air filter and a fan tray. -
FIG. 9 is a sectional side elevational view taken along line IX-IX inFIG. 2 . -
FIG. 10 is a flow chart illustrating a method according to an embodiment of the invention. - The present invention now is described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
- Like numbers refer to like elements throughout. In the figures, the thickness of certain lines, layers, components, elements or features may be exaggerated for clarity.
- The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the specification and relevant art and should not be interpreted in an idealized or overly formal sense unless expressly so defined herein. Well-known functions or constructions may not be described in detail for brevity and/or clarity.
- As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/or” includes any and all combinations of one or more of the associated listed items. As used herein, phrases such as “between X and Y” and “between about X and Y” should be interpreted to include X and Y. As used herein, phrases such as “between about X and Y” mean “between about X and about Y.” As used herein, phrases such as “from about X to Y” mean “from about X to about Y.”
- It will be understood that when an element is referred to as being “on”, “attached” to, “connected” to, “coupled” with, “contacting”, etc., another element, it can be directly on, attached to, connected to, coupled with or contacting the other element or intervening elements may also be present. In contrast, when an element is referred to as being, for example, “directly on”, “directly attached” to, “directly connected” to, “directly coupled” with or “directly contacting” another element, there are no intervening elements present. It will also be appreciated by those of skill in the art that references to a structure or feature that is disposed “adjacent” another feature may have portions that overlap or underlie the adjacent feature.
- Spatially relative terms, such as “under”, “below”, “lower”, “over”, “upper”, “lateral”, “left”, “right” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is inverted, elements described as “under” or “beneath” other elements or features would then be oriented “over” the other elements or features. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the descriptors of relative spatial relationships used herein interpreted accordingly.
- A
cabinet 10 according to an embodiment of the present invention is illustrated inFIG. 1 and includes ahousing 12 having anopening 14 into an interior 16 in which electronic or communication equipment (not illustrated) is housed. Adoor 18 is mounted by opening 14 and is connected to the housing by ahinge 20 for allowing access to interior 16 when open and for protecting the contents of the housing from the elements and unauthorized individuals when closed and, optionally, locked.Door 18 includes anouter panel 22 having a plurality ofvent openings 24 covered byscreens 26 and aninner panel 28 illustrated inFIGS. 2 , 3 and 4.Inner panel 28 includes either asingle aperture 30 divided into first andsecond apertures cross member 36 as illustrated inFIG. 4 , or first and secondindividual apertures FIG. 3 . Aspace 42 between theouter panel 22 and theinner panel 28 provides sound and heat insulation and accommodates part of afan box 44 described hereafter. When only asingle fan box 44 is needed,second aperture 34 orsecond aperture 40 is sealed off by aremovable panel 46 mounted thereover as illustrated, for example, inFIG. 2 . When it is necessary or desirable to move a greater quantity of air, asecond fan box 44′ can be mounted insecond aperture 34 orsecond aperture 40 as illustrated inFIG. 5 . Embodiments of the invention using adoor 18 having first andsecond apertures door 18 having a single aperture divided into first andsecond apertures - Referring now to
FIGS. 8 and 9 ,fan box 44 comprises aframe 48 defining an interior 49 and having afirst side portion 50, asecond side portion 52, afront side 54 facing in the direction of doorouter panel 22 and arear side 56 facing in the direction of interior 16 whendoor 18 is closed.First side portion 50 is connected toinner panel 28 next tofirst aperture 40 by ahinge 58, illustrated inFIG. 5 , allowingfan box 44 to pivot away fromfirst aperture 38 as illustrated inFIGS. 6 and 7 .Second side portion 52 includes aremovable retainer 60 which is described hereinafter. As illustrated inFIG. 9 , a firstperipheral wall 62 extends aroundinterior 49 of the fan box nearfront side 54, and a secondperipheral wall 64 extends aroundinterior 49 of the fan box, spaced from firstperipheral wall 62 in the direction of fan boxrear side 56. - A
first filter 66 is mounted in a space 68 between firstperipheral wall 64 and secondperipheral wall 64, and space 68 is selected based on the size of the filter to be used to provide a snug fit for the filter so that substantially all air passing throughfan box 44 must pass throughfirst filter 66.First filter 66 is inserted into space 68 through aside entrance 70, illustrated inFIG. 7 , which is selectively covered byretainer 60 and secured by suitable fasteners such as screws (not illustrated).Retainer 60 is configured to seat tightly against thefirst filter 66 to substantially prevent air passing through the fan box from circumventing thefirst filter 66.First filter 66 may comprise a disposable filter or a reusable filter, and reusable filters sold under the brand name QUADRAFOAM by the Universal Air Filter Company of Sauget, Ill. have been found to be suitable for this application. - A
second filter 72 is mounted on the side of secondperipheral wall 64 oppositefirst filter 66 and is held against the secondperipheral wall 64 by afan tray 74 mounted on therear side 56 of thefan box 44.Second filter 72 comprises a hydrophobic filter configured to substantially prevent the passage of particulate matter that is not trapped byfirst filter 66 and likewise to substantially prevent water from enteringcabinet 10 throughfan box 44. A suitable hydrophobic filter is an ePTFE (Expanded Polytetrafluoroethylene) based filter available from W. L. Gore & Associates.Second filter 72 will generally be more expensive thanfirst filter 66, but becausesecond filter 72 filters air that has already been filtered byfirst filter 66, it will require less frequent cleaning or replacement.Second filter 72, as illustrated inFIG. 9 , includes afirst flange 76 contacting secondperipheral wall 64 offan box 44 and asecond flange 78 contactingfan tray 74 whenfan tray 74 is mounted onfan box 44. If asecond filter 72 were used that did not include such first and second flanges, separate gasket members (not illustrated) could be used to ensure a substantially air-tight seal between thesecond filter 72, the secondperipheral wall 64 and thefan tray 74. -
Fan tray 74 comprises apanel 80 having afirst side 82 facingsecond filter 72 and asecond side 84 facinghousing interior 16 whendoor 18 is closed. A plurality offans 86 are mounted in openings inpanel 80 and connected to asuitable controller 88, illustrated inFIG. 10 , that providesfans 86 with power and that controls the activation state and speed of the fans.Controller 88 may be connected tofan tray 74 in any conventional manner such as via a wire or cable (not illustrated) that extends from the controller to thefan tray 74 acrossdoor hinge 20. Agasket 90 is mounted onfirst side 82 ofpanel 80 for forming a substantially air-tight seal with the interior 49 offan frame 46 and pressing againstsecond flange 78 ofsecond filter 72 when thefan tray 74 is mounted on thefan box 44. Apressure sensor 92 is mounted onsecond side 84 ofpanel 80 and operatively connected tocontroller 88, and atemperature sensor 94 inhousing 12 is also operatively connected tocontroller 88. - The removal of
first filter 66 andsecond filter 72 for cleaning or replacement and the removal offan tray 74 for repair will now be described. With reference toFIGS. 6 and 7 ,door 18 is opened to exposefan box 44, andsecond side portion 52 offan box frame 44 is removed fromfirst aperture 38 by pivoting thefan box 44 abouthinge 58 to exposeremovable retainer 60.Retainer 60 is removed by loosening screws (not illustrated) to exposefirst filter 66, and thefirst filter 66 can be slid out from between firstperipheral wall 62 and secondperipheral wall 64 and cleaned or replaced. The cleaned or newfirst filter 66 is then reinserted in space 68 as previously described,retainer 60 is replaced and secured, andfan box 44 is pivoted back intofirst aperture 38 as shown, for example, inFIG. 2 . -
Fan tray 74 is mounted torear side 56 offan box frame 48, and is readily accessible whendoor 18 ofcabinet 10 is opened. Iffan tray 74 or one ormore fans 86 on thefan tray 74 require service, they can be directly accessed by openingcabinet door 18. Alternately,fan tray 74 can be removed and replaced with a new fan tray when it is preferable to quickly return thecabinet 10 to service and troubleshoot the defective fan tray at a service facility rather than in the field. - An
exit opening 96 is provided on a wall of housing spaced fromdoor 18, such asrear wall 98 illustrated inFIG. 10 .Exit opening 96 allows air drawn intohousing 12 byfans 86 to leave the housing, taking with it much of the heat produced by equipment operating inside thecabinet 10.Exit opening 96 is selectively blockable by adamper assembly 100 which includes first andsecond flaps 102 which can be pivoted or otherwise moved between a closed position illustrated inFIG. 10 to an open position, not illustrated, that allows a relatively free flow of air from the interior of thehousing 12. Anactuator 104 operatively is operatively connected to thecontroller 88 and to the first andsecond flaps 102 and positions the first andsecond flaps 102 based on signals from thecontroller 88. Dashedline 106 illustrates the position of a vented cover (not illustrated for clarity) that fits overdamper assembly 100 to keep animals and insects out of thehousing 12 and to minimize the entry of rain. -
Controller 88 controls the position of damper flaps 102 based at least in part on input fromtemperature sensor 94. When the interior temperature ofhousing 12 exceeds a predetermined temperature, 5 degrees C., for example,controller 88 causes actuator 104 to openflaps 102. When the temperature of the housing interior drops below 5 degrees C.,controller 88 closes flaps 102 to retain heat and reduce the need for auxiliary heating of the cabinet. Thefans 86 may be turned on and off and operated at different speeds based on the sensed temperature of the housing in a conventional manner. - A method of determining when
first filter 66 and/orsecond filter 72 needs service is also possible with thecabinet 10 described above. According to this method, a first pressure reading is taken bypressure sensor 92 when thefans 86 are in a first operating state, such as off. Thefans 86 are then driven at a set speed, such as 60% of their maximum operating speed, and a second pressure reading is taken. The difference between these readings is compared to a predetermined value, and if the difference is less than the predetermined value, a signal is generated bycontroller 88 to indicate that the filters are at least partially blocked and require service. The predetermined amount may be established from baseline readings taken whenfirst filter 66 andsecond filter 72 are new. For example, it may be possible to raise the pressure insidehousing 12 by 2 psi by running thefans 86 at 60% of their maximum rate when the filters are not blocked. As the first and second filters become increasingly blocked with use, thefans 86 will not be able to draw in air at a high enough rate to increase the pressure in the housing by the same amount. When, for example, the pressure can no longer be raised by 1 psi, it may be time to service the filters. The actual amounts of pressure increase indicative of clean filters and filters that require service can be determined empirically for a particular installation, andcontroller 88 can run this test on a predetermined basis, daily, for example. A variety of different first and second fan operating states can be selected for performing the above test, such as 10 percent of maximum operating speed for the first state and 80 percent of maximum operating speed for the second test. However, it may be desirable to select a second state that is low enough, such as the 60% of maximum operating speed described above, to avoid the production of excessive turbulence inside the housing which can make it difficult to obtain an accurate pressure reading. - A method related to the above method is illustrated in the flow chart of
FIG. 11 which includes astep 110 of providing a sensor in an outdoor communications cabinet housing configured to provide an output based on a sensed pressure of the housing, astep 112 of determining a first level of the output when the at least one fan in the housing is in a first state, astep 114 of determining a second level of the output when the at least one fan is in a second state, astep 116 of determining a relationship between the first level and the second level, and astep 118 of generating a signal when the relationship satisfies a predetermined condition. - The present invention has been described in terms of preferred embodiments. However, modifications and additions to these embodiments will become apparent to those of ordinary skill in the relevant art upon a review of the foregoing disclosure. It is intended that all such modifications and additions comprise a part of the present invention to the extent they fall within the scope of the several claims appended hereto.
Claims (21)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/904,270 US20110086589A1 (en) | 2009-10-14 | 2010-10-14 | Outdoor communication cabinet including fan tray and filter and method of detecting blockage of communication cabinet filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US25150609P | 2009-10-14 | 2009-10-14 | |
US12/904,270 US20110086589A1 (en) | 2009-10-14 | 2010-10-14 | Outdoor communication cabinet including fan tray and filter and method of detecting blockage of communication cabinet filter |
Publications (1)
Publication Number | Publication Date |
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US20110086589A1 true US20110086589A1 (en) | 2011-04-14 |
Family
ID=43297153
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/904,270 Abandoned US20110086589A1 (en) | 2009-10-14 | 2010-10-14 | Outdoor communication cabinet including fan tray and filter and method of detecting blockage of communication cabinet filter |
US12/904,367 Active 2031-04-29 US8279602B2 (en) | 2009-10-14 | 2010-10-14 | Communications cabinet with projectile resistant vents |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
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US12/904,367 Active 2031-04-29 US8279602B2 (en) | 2009-10-14 | 2010-10-14 | Communications cabinet with projectile resistant vents |
Country Status (2)
Country | Link |
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US (2) | US20110086589A1 (en) |
WO (1) | WO2011047116A1 (en) |
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Also Published As
Publication number | Publication date |
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WO2011047116A1 (en) | 2011-04-21 |
US20110085300A1 (en) | 2011-04-14 |
US8279602B2 (en) | 2012-10-02 |
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