CA1133691A - Powder spray booth - Google Patents
Powder spray boothInfo
- Publication number
- CA1133691A CA1133691A CA338,235A CA338235A CA1133691A CA 1133691 A CA1133691 A CA 1133691A CA 338235 A CA338235 A CA 338235A CA 1133691 A CA1133691 A CA 1133691A
- Authority
- CA
- Canada
- Prior art keywords
- powder
- booth
- chamber
- clean air
- collection chamber
- 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.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
- B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
- B01D46/2407—Filter candles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/56—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition
- B01D46/58—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with multiple filtering elements, characterised by their mutual disposition connected in parallel
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/43—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by filtering the air charged with excess material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B14/00—Arrangements for collecting, re-using or eliminating excess spraying material
- B05B14/40—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths
- B05B14/43—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by filtering the air charged with excess material
- B05B14/435—Arrangements for collecting, re-using or eliminating excess spraying material for use in spray booths by filtering the air charged with excess material with means for cleaning the filters by gas flow, e.g. blasts of air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
- B05B16/00—Spray booths
- B05B16/90—Spray booths comprising conveying means for moving objects or other work to be sprayed in and out of the booth, e.g. through the booth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2273/00—Operation of filters specially adapted for separating dispersed particles from gases or vapours
- B01D2273/30—Means for generating a circulation of a fluid in a filtration system, e.g. using a pump or a fan
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Geometry (AREA)
- Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
Abstract
POWDER SPRAY BOOTH
ABSTRACT OF THE DISCLOSURE
A spray booth for powder coating is disclosed.
The booth has a self contained recovery/filter system in the floor, and is removably attached to the booth so that another recovery system can be used when spraying different powders, different colors, or to facilitate cleaning or repair of the recovery system, without disabling the spraying operation. The placement of the recovery/filter system in the base of the booth allows the elimination of restrictions in the air flow passages to the recovery/filter system, with the attendant benefit that there are no confined areas where powder contaminated air could cause an explosion.
ABSTRACT OF THE DISCLOSURE
A spray booth for powder coating is disclosed.
The booth has a self contained recovery/filter system in the floor, and is removably attached to the booth so that another recovery system can be used when spraying different powders, different colors, or to facilitate cleaning or repair of the recovery system, without disabling the spraying operation. The placement of the recovery/filter system in the base of the booth allows the elimination of restrictions in the air flow passages to the recovery/filter system, with the attendant benefit that there are no confined areas where powder contaminated air could cause an explosion.
Description
~3369~
FIELD OF T~IE INVENTIO~ .
This invention relates generally to the powder coating art, and more particularly relates to a booth in which to carry out the spray application of the powder.
B CXGROUND OF THE INVENTION
The powder coating art is fairly well known to the coatin~ industry. In general, a powdered resin is applied to a substrate, and then the substrate and powder are heated so that the powder melts and forms a coating on the substrate when it cools. The powder is almost invariably deposited on the substrate with the aid of electrostatic application techniques. These electrostatic application techniques generally lnclude some process of imparting an electrical charge to the powder, the substrate, or both in order to aid deposition and retention of the powder on the substrate. These electrostatic techniques are well known, and therefore need not be discussed in detail here.
By and large, the powder deposition is performed in a booth, some co~trolled area which functions to contain any oversprayed powder which is not deposited on the articles to be coated. In many systems, the containment of the powder in the booth is aided by an exhaust system which creates a negative pressure within the booth and causes the oversprayed powder to be drawn out of the booth to recovery
FIELD OF T~IE INVENTIO~ .
This invention relates generally to the powder coating art, and more particularly relates to a booth in which to carry out the spray application of the powder.
B CXGROUND OF THE INVENTION
The powder coating art is fairly well known to the coatin~ industry. In general, a powdered resin is applied to a substrate, and then the substrate and powder are heated so that the powder melts and forms a coating on the substrate when it cools. The powder is almost invariably deposited on the substrate with the aid of electrostatic application techniques. These electrostatic application techniques generally lnclude some process of imparting an electrical charge to the powder, the substrate, or both in order to aid deposition and retention of the powder on the substrate. These electrostatic techniques are well known, and therefore need not be discussed in detail here.
By and large, the powder deposition is performed in a booth, some co~trolled area which functions to contain any oversprayed powder which is not deposited on the articles to be coated. In many systems, the containment of the powder in the booth is aided by an exhaust system which creates a negative pressure within the booth and causes the oversprayed powder to be drawn out of the booth to recovery
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'~ , ~'' '' 1~336~1 and filtering devices in a controlled manner. In some systems, the oversprayed powder which is collected i5 .
merely saved for future use, while in others it is recycled to the application device automatically.
In a powder coating installation, there are several critical or desirable aspects which must be considered, some of which include: safety; efficiency;
the size of the equipment; the complexity of the opesation and construction; color change; cleaning; maintenance; and the containment and/or recovery of powder not deposited on the substrate, as-well as others. The spray booth used in these systems, being an integral part of the installation, must also be considered from these ætandpoints. Therefore, it is a general object of this invention to provide a spray booth which provides a substantial overall improvement in spray booths in view of these criteria.
In many regards, it is desirable to use static, cartridge type filters or the typical "bag house~ type as part of the filter and recovery aspects of the system.
These types of filters have no moving parts, and therefore offer simplicity, combed with reliability and efficiency.
However, if these filter/recovery units are located remotely, the powder laden air is drawn out of the spray booth to the filter/recovery unit through ductwor~ os some other restriction, or through a confined area. In many systems, if not all, the filter/recovery unit itself represents a confined area. ~his gives rise to a deficiency in these prior art systems, in that they present a possibility of explosionO
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~133691 .
~ he resins used in powder coating are, as a class, generally flammable. In their powdered form, and within certain air-to-powder ratios, they can burn rapidly. Thus, it can be appreciated that if an air/powder mixture were somehow to become ignited in an enclosed or restricted space, the result could be an explosion. Although burning of the powder even in an open space, can be inconvenient and present safety hazards to both life and limb, an explosion generally gives rise to more dreaded consequences. Thus, because these confined areas in the prior art systems give rise to the possibility of an explosion, it is an object of this invention to provide a booth/recovery system without confined areas which could create a potentially explosive condition. The recovery/filter portion of the system is located integrally with the booth 50 that there is no necessity of having ductwork which could create a confined area.
Although some prior art booths did incorporate an integral recovery system with the booth, and although some of them did substantially reduce the ~confined areas~, these prior art systems were complex and costly to build, operate and/or to maintain. Therefore, it is another object of certain aspects of this invention to provide a powder spray booth/recovery system which is simple in its design, manufacture, maintenance and operation, but yet which eliminat~ confined areas having 25 ¦¦explosiv ir/powdes mix~uros.
:
~ 1133691 Another important consideration with respect to ¦powder coating booths is the ability to quickly change the ¦powders, or color of the powder being sprayed. In this ¦regard, it is important that the previous composition be ¦effectively removed from the system, lest it contaminate the ¦subsequent coating operation with a different powder.
¦Therefore, it is an object of certain aspects of this ¦invention to provide a spray booth/recovery system which ¦is safe, simple and yet which will provide the ability to ¦quickly and efficiently be capable of being changed from ¦one color or powder to another, and which further will ¦facilitate maintenance of the system without disabling the ¦spray coating operationO
In general then, this invention provides a spray booth/recovery system which utilizes static filters and which provides improved safety and color change capabilities in a very compact system.
The booth/recovery system compr~ses a booth in which to powder coat substrates, having a ceiling area, walls, and a floor, and having a recovery system underneath the floor of the booth. The recovery system comprises a powder collector area below the booth, and a clean air chamber sealed from the booth and from the powder collection area, but being provided with an opening from the collection area into the chamber through static filters. The collection area is open to the interior of the spray booth through a hole of substantial cross sectional area in the floor of the booth and leading directly to the collection area.
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' ' , ' ~ ~ ' , . . . ' ' '~
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: ' ~33691 A blower is provided to create a negative pressure in the chamber so that powder laden air is drawn down through the opening in tha floor of the booth into the collection area immediately below the booth, and thence upward through filters to the clean air chamber. This filtered air having only traces of fine powder in a non-explosive ratio, is withdrawn from the clean air chamber through the blower, and passed to an absolute filter for final filtering.
Because of the location of the complete recovery system underneath the spray booth, the space required for the booth/recovery system is reduced to the floor space required for the booth itself, whereas prior systems required floor space for both the booth and the recovery system.
Because of the substantial cross sectional area of the opening in the floor of the booth to the collecting area, there are no "confined areas" to present explosive conditions. The only confined area in the air flow path is downstream of the filters, where the air/powder ratio is non-hazardous.
The integral collector below the booth can be detachably attached to the booth, mounted on wheels and be provided with detachable fastenings to the ductwork for the blower, so that when color change is desired, or when filter change is desired, or when maintenance must be done on the collector, another recovery system can quickly and efficiantly ., ... , . . , " ,.,... ; ' ,''", ,,,''~^''' " ' _ ' .
, ~336~1 b~ placed under the booth, attached, and started up so that spray coating can continue even during these operations.
Therefore, in accordance with the present inven-tion there is provided a powder spray booth and powder recovery/static filter unit configuration comprising;
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, side and 3 end walls and a floor; a powder collection chamber in com-munication with the interior of the booth means; a clean air chamber sealed from t~e booth and from the powder col-lection chamber, the clean air chamber being provided with an opening from the powder collection chamber into the clean air chamber; static filter means located within the powder collection chamber and operative to effectively prevent powder from entering the clean air chamber; blower means operative to create a negative pressure in the clean air chamber; and means for preventing a fire within the powder collection chamber from cauSIng an explosion~ the explosion prevention means including a substantially unrestricted flow path from the powder collection chamber into the booth oper-ative to effectively vent any fire created pressure build-up within the powder collection chamber into the booth without the occurrence of an explosion.
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1~3369~
B~IEF DESCRIPTION OF THE DRAWINGS
¦ The above noted and other benefits will be readily .
¦ appreciated by those skilled in the art by reference to the ¦ drawing figures, and the following specification wherein:
5 ¦ FIGURE 1 is a perspective view of a spray ¦ coating booth having a recover~collection ¦ system in its base; and ¦ FIG~RE 2 is a fragmentary view of the interior ¦ construction of the recovery/collection system 10 ¦ in the base of the booth of Figure 1.
1~ , 113;3691 DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring first to Figure 1, the system comprises generally a spray booth 1, having a base 2 which comprises the filter/recovery system for the powder, and an absolute filter 5 connected to the base 2 through ductwork 3. The ductwork 3 connects on either side of one end of the base 2 by means of quick-disconnect connections 30 to holes 22 (see Figure 2) in the base. This ductwork 3 communicates the interior of the base 2 to a blower 4 which creates a negative pressure in the base 2 as will be more fully dis-cussed later. The blower 4 exhausts into a plenum 29 having filters 28 which clean any air discharged therethrough. The blower 4 can be mounted on a base l0 for convenience.
The spray booth 1 defines a controlled area for spraying and comprises generally a ceiling portion 6, opposed side wall portions 7, opposed end walls 32 and a floor area 8. The floor area 8, in this embodiment, actually comprises the top of the recovery/collector unit 2 and hence the two elements are designated by a common reference numeral herein. The booth 1 is supported by legs over the base 2. An opening is provided in one of the side walls 7 of the booth l and both end walls 32. The opening in the side wall 7 provides access into the interior of the booth 1 for spraying equipment, or for access for a man to enter the booth himself. Openings are provided in each end wall 32 for product to be transported through the booth 1 for spraying.
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A slot 9 in the ceiling portion 6 of the booth allows the passage of conveyor hooks or the like from an overhead conveyor to carry the articles to be coated through the booth 1.
S Referring now to Figure 2, the details of the recovery/filter unit in the base 2 of the booth 1 can be seen. Figure 2 is a fragmentary view of the collector/
recovery unit 2 showing the interior details of the unit.
The base 2 is generally comprised of opposed exterior side walls 21, end walls 33, an upper wall 8, and a bottom portion 13. As noted above, the upper wall 8 also forms the floor of the booth. Along each of the opposed side walls 21 of the base 2 is a clean air chamber 19 below the floor 8 of the booth 1, defined between part of an exterior side wall 21 of the base, the upper wall 8 of the base, part of an inner side wall 11 and a bottom chamber-wall 20.
There are holes 22 in one end wall 33 for each clean air chamber 19 to connect the ductwork 3 (See Figure 1), in order to create a negative pre~sure in the clean air chamber 19 and to draw air thereinto.
The interior side wall 11 extends downward from the floor 8 and forms a centrally located air flow passage 12 directly from the booth to a powder collection area 14 below the clean air cha~bers 19. The centrally located air flow passage 12 is elongated in the direction of travel of the ~ ~ ~- ~~ -- -- ~r_~-- . ~ . -- --- - ._.. _.. _. __._._ .. _ .~ .... _ _._ , . .. ,_._.. .... . ....
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~L13~6~1 articles to be coated and extends across the whole ~ength of the booth 1. It is of substantial cross sectional area so as not to present a restriction which would result in a "confined area" subject to explosion.
S Each chamber 19 is provided with multiple holes 17 on the underside through the bottom walls 20. Each of these hoies 1~ is capped by a static cartridge type filter 16.
~he filters 16 can be removeably attached to the chamber 19 by any suitable means. In this embodiment the holes in the bottom wall 20 of the clean air chamber 19, and associated filter elements 16, are arranged in three banks of ~ix filters on each side of the unit making a total of six filter banks. Each bank consists of two rows, three deepO
In the plane of Figure 2, four filters 16 can be seen, two on each side.
~ elow each of the six banks of filters, the bottom 13 of the base 2 tapers downward in the shape of a pyramid, each pyramid defining one of six powder collection areas 14 where powder filtered out of the air by the filters 16 is collected. At the apex of each "pyramid" is a venturi pump 15 or other suitable means to transport the collected powder to a recycling bin, or storage for future use or discarding. There is an opening (not shown) at the apex of ach pyra~id communi ating with a respective ~e~tori pgmp 15.
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' ~3369~
- - Interiorly of the clean air chamber 19, venturi throats 18 are situated above and around each of the holes 17 through which filtered air passes. A series of pipes 25 extend across the base 2, one each in alignment with all four of the venturi throats 18, and hence the filters 16, across in a row. Each of the pipes 25 has four holes 26 in its underside which are aligned one each with a respective venturi throat 18. An air solenoid 24 associated with each pipe 25 and mounted exteriorly of the outside wall 21 is effective to discharge a burst of air into a respective pipe 25, and thus out of the holes 26 in the underside of the pipe 25 into each venturi throat 18. The burst causes momentary reverse air flow through the filters 16, and dis-lodges collected powder from the filter material. The dislodged powder falls into a respective "pyramid" collection area 14. The solenoids 24 are sequentially operated through any suitable control mechanism well known in the art, so that only one bank or row is cleaned at a time. Therefore, there is no net interruption of the air flow through the filter/
collector unit 2. Access doors 27 are mounted on the exterior side walls 21 for servicing or replacing the filters 16.
The whole base 2 is mounted on wheels 23 to allow the base 2 to be easily removed from underneath the spray booth 1, so ¦that a new base 2 can be substituted therefor in order to 25 ¦facilitate the spraying of a new powder or color, or to ~service the unit.
If necessary, a rubber gasket can be used to seal the periphery of the base unit to the booth.
Having described my invention, I claim:
..... ,,... ......... ,.. ~_.,,.... . '....... ,, ...... ...... ,.. _... ,,.... .' . , _ . .
" , . ,_ ,, '. . '
~ :
.
'~ , ~'' '' 1~336~1 and filtering devices in a controlled manner. In some systems, the oversprayed powder which is collected i5 .
merely saved for future use, while in others it is recycled to the application device automatically.
In a powder coating installation, there are several critical or desirable aspects which must be considered, some of which include: safety; efficiency;
the size of the equipment; the complexity of the opesation and construction; color change; cleaning; maintenance; and the containment and/or recovery of powder not deposited on the substrate, as-well as others. The spray booth used in these systems, being an integral part of the installation, must also be considered from these ætandpoints. Therefore, it is a general object of this invention to provide a spray booth which provides a substantial overall improvement in spray booths in view of these criteria.
In many regards, it is desirable to use static, cartridge type filters or the typical "bag house~ type as part of the filter and recovery aspects of the system.
These types of filters have no moving parts, and therefore offer simplicity, combed with reliability and efficiency.
However, if these filter/recovery units are located remotely, the powder laden air is drawn out of the spray booth to the filter/recovery unit through ductwor~ os some other restriction, or through a confined area. In many systems, if not all, the filter/recovery unit itself represents a confined area. ~his gives rise to a deficiency in these prior art systems, in that they present a possibility of explosionO
., - . . , . ~
.
. ~ ' .
~133691 .
~ he resins used in powder coating are, as a class, generally flammable. In their powdered form, and within certain air-to-powder ratios, they can burn rapidly. Thus, it can be appreciated that if an air/powder mixture were somehow to become ignited in an enclosed or restricted space, the result could be an explosion. Although burning of the powder even in an open space, can be inconvenient and present safety hazards to both life and limb, an explosion generally gives rise to more dreaded consequences. Thus, because these confined areas in the prior art systems give rise to the possibility of an explosion, it is an object of this invention to provide a booth/recovery system without confined areas which could create a potentially explosive condition. The recovery/filter portion of the system is located integrally with the booth 50 that there is no necessity of having ductwork which could create a confined area.
Although some prior art booths did incorporate an integral recovery system with the booth, and although some of them did substantially reduce the ~confined areas~, these prior art systems were complex and costly to build, operate and/or to maintain. Therefore, it is another object of certain aspects of this invention to provide a powder spray booth/recovery system which is simple in its design, manufacture, maintenance and operation, but yet which eliminat~ confined areas having 25 ¦¦explosiv ir/powdes mix~uros.
:
~ 1133691 Another important consideration with respect to ¦powder coating booths is the ability to quickly change the ¦powders, or color of the powder being sprayed. In this ¦regard, it is important that the previous composition be ¦effectively removed from the system, lest it contaminate the ¦subsequent coating operation with a different powder.
¦Therefore, it is an object of certain aspects of this ¦invention to provide a spray booth/recovery system which ¦is safe, simple and yet which will provide the ability to ¦quickly and efficiently be capable of being changed from ¦one color or powder to another, and which further will ¦facilitate maintenance of the system without disabling the ¦spray coating operationO
In general then, this invention provides a spray booth/recovery system which utilizes static filters and which provides improved safety and color change capabilities in a very compact system.
The booth/recovery system compr~ses a booth in which to powder coat substrates, having a ceiling area, walls, and a floor, and having a recovery system underneath the floor of the booth. The recovery system comprises a powder collector area below the booth, and a clean air chamber sealed from the booth and from the powder collection area, but being provided with an opening from the collection area into the chamber through static filters. The collection area is open to the interior of the spray booth through a hole of substantial cross sectional area in the floor of the booth and leading directly to the collection area.
.
' ' , ' ~ ~ ' , . . . ' ' '~
.. '~ ., ' ' ~
: ' ~33691 A blower is provided to create a negative pressure in the chamber so that powder laden air is drawn down through the opening in tha floor of the booth into the collection area immediately below the booth, and thence upward through filters to the clean air chamber. This filtered air having only traces of fine powder in a non-explosive ratio, is withdrawn from the clean air chamber through the blower, and passed to an absolute filter for final filtering.
Because of the location of the complete recovery system underneath the spray booth, the space required for the booth/recovery system is reduced to the floor space required for the booth itself, whereas prior systems required floor space for both the booth and the recovery system.
Because of the substantial cross sectional area of the opening in the floor of the booth to the collecting area, there are no "confined areas" to present explosive conditions. The only confined area in the air flow path is downstream of the filters, where the air/powder ratio is non-hazardous.
The integral collector below the booth can be detachably attached to the booth, mounted on wheels and be provided with detachable fastenings to the ductwork for the blower, so that when color change is desired, or when filter change is desired, or when maintenance must be done on the collector, another recovery system can quickly and efficiantly ., ... , . . , " ,.,... ; ' ,''", ,,,''~^''' " ' _ ' .
, ~336~1 b~ placed under the booth, attached, and started up so that spray coating can continue even during these operations.
Therefore, in accordance with the present inven-tion there is provided a powder spray booth and powder recovery/static filter unit configuration comprising;
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, side and 3 end walls and a floor; a powder collection chamber in com-munication with the interior of the booth means; a clean air chamber sealed from t~e booth and from the powder col-lection chamber, the clean air chamber being provided with an opening from the powder collection chamber into the clean air chamber; static filter means located within the powder collection chamber and operative to effectively prevent powder from entering the clean air chamber; blower means operative to create a negative pressure in the clean air chamber; and means for preventing a fire within the powder collection chamber from cauSIng an explosion~ the explosion prevention means including a substantially unrestricted flow path from the powder collection chamber into the booth oper-ative to effectively vent any fire created pressure build-up within the powder collection chamber into the booth without the occurrence of an explosion.
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1~3369~
B~IEF DESCRIPTION OF THE DRAWINGS
¦ The above noted and other benefits will be readily .
¦ appreciated by those skilled in the art by reference to the ¦ drawing figures, and the following specification wherein:
5 ¦ FIGURE 1 is a perspective view of a spray ¦ coating booth having a recover~collection ¦ system in its base; and ¦ FIG~RE 2 is a fragmentary view of the interior ¦ construction of the recovery/collection system 10 ¦ in the base of the booth of Figure 1.
1~ , 113;3691 DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring first to Figure 1, the system comprises generally a spray booth 1, having a base 2 which comprises the filter/recovery system for the powder, and an absolute filter 5 connected to the base 2 through ductwork 3. The ductwork 3 connects on either side of one end of the base 2 by means of quick-disconnect connections 30 to holes 22 (see Figure 2) in the base. This ductwork 3 communicates the interior of the base 2 to a blower 4 which creates a negative pressure in the base 2 as will be more fully dis-cussed later. The blower 4 exhausts into a plenum 29 having filters 28 which clean any air discharged therethrough. The blower 4 can be mounted on a base l0 for convenience.
The spray booth 1 defines a controlled area for spraying and comprises generally a ceiling portion 6, opposed side wall portions 7, opposed end walls 32 and a floor area 8. The floor area 8, in this embodiment, actually comprises the top of the recovery/collector unit 2 and hence the two elements are designated by a common reference numeral herein. The booth 1 is supported by legs over the base 2. An opening is provided in one of the side walls 7 of the booth l and both end walls 32. The opening in the side wall 7 provides access into the interior of the booth 1 for spraying equipment, or for access for a man to enter the booth himself. Openings are provided in each end wall 32 for product to be transported through the booth 1 for spraying.
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A slot 9 in the ceiling portion 6 of the booth allows the passage of conveyor hooks or the like from an overhead conveyor to carry the articles to be coated through the booth 1.
S Referring now to Figure 2, the details of the recovery/filter unit in the base 2 of the booth 1 can be seen. Figure 2 is a fragmentary view of the collector/
recovery unit 2 showing the interior details of the unit.
The base 2 is generally comprised of opposed exterior side walls 21, end walls 33, an upper wall 8, and a bottom portion 13. As noted above, the upper wall 8 also forms the floor of the booth. Along each of the opposed side walls 21 of the base 2 is a clean air chamber 19 below the floor 8 of the booth 1, defined between part of an exterior side wall 21 of the base, the upper wall 8 of the base, part of an inner side wall 11 and a bottom chamber-wall 20.
There are holes 22 in one end wall 33 for each clean air chamber 19 to connect the ductwork 3 (See Figure 1), in order to create a negative pre~sure in the clean air chamber 19 and to draw air thereinto.
The interior side wall 11 extends downward from the floor 8 and forms a centrally located air flow passage 12 directly from the booth to a powder collection area 14 below the clean air cha~bers 19. The centrally located air flow passage 12 is elongated in the direction of travel of the ~ ~ ~- ~~ -- -- ~r_~-- . ~ . -- --- - ._.. _.. _. __._._ .. _ .~ .... _ _._ , . .. ,_._.. .... . ....
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~L13~6~1 articles to be coated and extends across the whole ~ength of the booth 1. It is of substantial cross sectional area so as not to present a restriction which would result in a "confined area" subject to explosion.
S Each chamber 19 is provided with multiple holes 17 on the underside through the bottom walls 20. Each of these hoies 1~ is capped by a static cartridge type filter 16.
~he filters 16 can be removeably attached to the chamber 19 by any suitable means. In this embodiment the holes in the bottom wall 20 of the clean air chamber 19, and associated filter elements 16, are arranged in three banks of ~ix filters on each side of the unit making a total of six filter banks. Each bank consists of two rows, three deepO
In the plane of Figure 2, four filters 16 can be seen, two on each side.
~ elow each of the six banks of filters, the bottom 13 of the base 2 tapers downward in the shape of a pyramid, each pyramid defining one of six powder collection areas 14 where powder filtered out of the air by the filters 16 is collected. At the apex of each "pyramid" is a venturi pump 15 or other suitable means to transport the collected powder to a recycling bin, or storage for future use or discarding. There is an opening (not shown) at the apex of ach pyra~id communi ating with a respective ~e~tori pgmp 15.
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- - Interiorly of the clean air chamber 19, venturi throats 18 are situated above and around each of the holes 17 through which filtered air passes. A series of pipes 25 extend across the base 2, one each in alignment with all four of the venturi throats 18, and hence the filters 16, across in a row. Each of the pipes 25 has four holes 26 in its underside which are aligned one each with a respective venturi throat 18. An air solenoid 24 associated with each pipe 25 and mounted exteriorly of the outside wall 21 is effective to discharge a burst of air into a respective pipe 25, and thus out of the holes 26 in the underside of the pipe 25 into each venturi throat 18. The burst causes momentary reverse air flow through the filters 16, and dis-lodges collected powder from the filter material. The dislodged powder falls into a respective "pyramid" collection area 14. The solenoids 24 are sequentially operated through any suitable control mechanism well known in the art, so that only one bank or row is cleaned at a time. Therefore, there is no net interruption of the air flow through the filter/
collector unit 2. Access doors 27 are mounted on the exterior side walls 21 for servicing or replacing the filters 16.
The whole base 2 is mounted on wheels 23 to allow the base 2 to be easily removed from underneath the spray booth 1, so ¦that a new base 2 can be substituted therefor in order to 25 ¦facilitate the spraying of a new powder or color, or to ~service the unit.
If necessary, a rubber gasket can be used to seal the periphery of the base unit to the booth.
Having described my invention, I claim:
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Claims
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
(1 ) A powder spray booth and powder recovery/static filter unit configuration comprising:
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, side and end walls, and a floor;
a powder collection chamber in communication with the interior of said booth means;
a clean air chamber sealed from the booth and from the powder collection chamber, said clean air chamber being provided with an opening from the powder collection chamber into said clean air chamber;
static filter means located within said powder collection chamber and operative to effectively prevent powder from entering said clean air chamber;
blower means operative to create a negative pressure in said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion prevention means including a substantially unrestricted flow path from said powder collection chamber into said booth operative to effectively vent any fire created pressure build up within said powder collection chamber into said booth without the occurrence of an explosion.
(2 ) The booth and powder recovery/static filter unit of Claim 1 wherein said flow path from said booth to said powder collection chamber is in the floor of said booth and opens direct-ly into said powder collection chamber, (3 ) The booth and powder recovery/static filter unit of Claim 1 in which said static filter means comprises a plurality of static filter cartridges and further including means for periodically cleaning powder from the surface of said filter cartridges by reversing air flow through the filter cartridges, (4 ) A powder spray booth and powder recovery unit compris-ing:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor;
a powder recovery unit including a powder collection chamber, an air flow path from said booth into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth into said powder collection chamber then upwardly through said filter means into said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion prevention means including a substantially unrestricted flow path between said powder collection chamber and said booth operative to effect-ively vent any fire within said powder collection chamber into said powder booth and thereby prevent any fire created pressure build up and explosion within said powder recovery unit.
( 5) A powder spray booth and powder recovery/static filter unit system comprising:
a booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling area, at least two opposed side walls, and a floor area; and a powder recovery system comprising:
a pair of powder collection chambers each of said powder collection chambers having an upper portion located below said booth, and having an elongated air flow passage communicating with said booth;
two clean air chambers, each of said clean sir chambers being located immediately adjacent opposite a side of one of said powder collection chambers, said clean air chambers having a multi-plicity of individual openings thereinto to provide air flow paths from said collection chamber to respective ones of said clean air chambers;
static filter means associated with each of said openings into said clean air chambers to effectively filter out powder from the air passing therethrough into said clean air chambers;
and blower means to create a negative pressure in said clean air chambers, and to cause powder laden air to be drawn through the air flow passage into the powder collection chamber, and to cause filtering of the powder from said powder laden air by said filter means as air is drawn into said clean air chambers; and means for preventing a fire within said powder collection chambers from causing an explosion, said explosion prevention means including a substantially unrestricted flew path between said powder collection chambers and said booth operative to effectively vent any fire within said powder collection chamber into said powder booth and thereby prevent any fire created pressure build up and explosion within said powder recovery system.
(6 ) The powder spray booth and recovery system of Claim 5 wherein the multiplicity of individual openings into said lean air chambers are located on the underside portion thereof.
(7 ) The powder spray booth and recovery system of Claim 6 which further comprises means to detachably seal the recovery system from said booth and said blower means, and to substitute a similar unit therefor.
(8 ) A powder spray booth and powder recovery unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor which slopes downwardly;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including a first opening of substantial cross section area into said collection chamber, said first opening also permitting excess powder material to flow from said floor into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber;
a second opening from the powder collection chamber into said clean air chamber;
static filter means mounted adjacent said second opening for preventing powder from entering said clean air chamber through said second opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
means for cleaning said filter means whereby accumulated powder is deposited in said collection chamber together with the excess powder for future recovery; and means for preventing a fire within said powder collect-ion chamber from causing an explosion within said collection chamber, said explosion prevention means comprising an unrestrict-ed flow path including said first opening between said powder collection chamber and said booth operative to effectively vent any fire in said powder collection chamber into said booth and thereby prevent any fire within said powder chamber from causing an explosion.
(9 ) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor, a powder collection chamber disposed underneath the booth;
said floor including an opening of substantial cross-sectional area providing an air flow path from said booth into said collection chambers a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static fitter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said static filter means into said clean air chamber.
(10) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor which slopes downwardly;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including an opening of substantial cross-sectional area providing an air flow path directly from said booth into said collection chamber, said opening also permitting excess powder material to flow from said floor into said collect-ion chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
and means for cleaning said static filter means whereby accumulated powder is deposited in said collection chamber to-gether with the excess powder for future recovery.
(11) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including an opening of substantial cross-sectional area providing an air flow path directly from said booth into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber whereby powder entrained in the air during the coat-ing process is separated from the air and collected in the powder collection chamber while substantially powder-free air is dis-charged into said clean air chamber without the occurrence of an air-powder mixture flowing through a conduit or other confined space and thereby creating explosion hazards.
(12) A powder spray booth and powder recovery system comprising:
an enclosed booth for powder coating substrates having walls and a ceiling with apertures selectively formed therein through which substrates are positioned within said booth and powder applied thereto, and having a floor with a first opening formed therein of substantial cross section;
said booth having a length and said first opening extend-ing substantially the length of the booth;
a plenum in direct communication with said opening having a cross section essentially the cross section of said first opening;
a powder collection chamber positioned proximate said plenum;
a second opening of substantial cross section from said plenum into said powder collection chamber;
a clean air chamber positioned proximate said powder collection chamber with a third opening in communication with said powder collection chamber;
static filter means positioned with respect to said third opening to filter powder from air passing into said clean air chamber;
blower means connected to said clean air chamber to (12) (continued) create a negative pressure in said clean air chamber whereby air flows from said booth into said powder collection chamber and into said clean air chamber;
said plenum, powder collection chamber and clean air chamber being assembled into a powder recovery unit positioned under the floor of said booth; and said powder collection chamber being positioned so that the air flow from said plenum is essentially downward and is thereafter angulated from the downward toward a collection point in said collection chamber and thereafter upward to said filters and clean air chamber.
(13) The powder spray booth and powder recovery system of Claim 12 wherein n said collection chamber has side walls sloping downward toward a collection point.
(14) The powder spray booth and powder recovery system of Claim 12 wherein said filter means are static filters of the type which are structurally rigid with sides and a length and which are mounted to have their lengths oriented essentially to the vertical.
(15) A system for collecting airborne powder from a source thereof, said system comprising a powder collection chamber;
a clean air chamber sealed from the source of said airborne powder and from the powder collection chamber, said clean air chamber being provided with an opening from the powder collection chamber into said clean air chamber;
static filter means located within said powder collect-ion chamber and operative to effectively prevent powder from entering said clean air chamber;
blower means operative to create a negative pressure in said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion preventing means including a substantially unrestricted flow path from said source into said powder collection chamber operative to effect-ively vent any fire created pressure build-up within said powder collection chamber to said source without the occurrence of an explosion.
(16) A system for collecting airborne powder from a source thereof, said system comprising:
a source of airborne powder;
a powder collection chamber disposed at an elevation lower than the source;
a first opening of substantial cross section area from said source into said collection chamber;
a clean air chamber sealed from the source, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, a second opening from the powder collection chamber into said clean air chamber;
static filter means mounted adjacent said second open-ing for preventing powder from entering said clean air chamber through said second opening while permitting air flow from the powder collection chamber into said clean air chamber;
(16) (continued) blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
means for cleaning said filter means whereby accumulated powder is deposited in said collection chamber together with the excess powder for future recovery; and means for preventing a fire within said powder collec-tion chamber from causing an explosion within said collection chamber, said explosion prevention means comprising an unrestricted flow path including said first opening between said powder collection chamber and said booth operative to effectively vent any fire in said powder collection chamber into said booth and thereby prevent any fire within said powder chamber from causing an explosion.
17. A combination powder spray booth and powder recovery/static cartridge filter unit configuration com-prising:
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, front, rear and end walls, and a floor; said front wall having a work opening formed therein, said rear wall being solid and impervious to air flow, said end walls having an opening therein for the transport of workpieces through said booth, and said floor having a substantial opening therein, an air flow passage located beneath said floor opening, said air flow passage being defined at least in part by an inner side wall, a powder collection chamber in close proximity to the booth; said powder collection chamber being located be-neath said air flow passage and in communication therewith, means for removing collected powder from the bottom of said powder collection chamber, a filter chamber located above said powder collec-tion chamber, said filter chamber being separated from said air flow passage by said inner side wall of said air flow passage, a clean air chamber sealed from the booth and from the powder collection chamber, said clean air chamber being provided with a multiplicity of individual openings from the powder collection chamber into said clean air chamber;
static filter means located with said filter chamber and operative to effectively prevent powder from entering said clean air chamber, said static filter means comprising a plurality of static filter cartridges, blower means operative to create a negative pres-sure in said clean air chamber; whereby said blower means draws air entrained powder from said booth through said floor opening, downwardly through said air flow passage into said powder collection chamber, hence upwardly into said filter chamber, through said static filter cartridges, and into said clean air chamber, means for cleaning powder from the surface of said filter cartridges by periodically and sequentially reversing air flow through selected filter cartridges while maintaining air flow from said powder collection chamber to said clean air chamber through the other of said filter cartridges so that there is no net interruption of the air flow from the powder collection chamber into the clean air chamber during the cleaning of said selected filter cartridges; and means for preventing a fire within said powder collection chamber from causing an explosion, said explosion preventing means including a substantially unrestricted air flow path leading from said powder collection chamber through said air flow passage into said booth and operative to effec-tively vent any fire created pressure build-up within said powder collection chamber into said booth without the occur-rence of an explosion.
18. The powder spray booth and powder recovery unit of Claim 17 wherein the multiplicity of individual open-ings into said clean air chambers are located on the under-side portion thereof.
19. The powder spray booth and recovery system of Claim 17 which further comprises means to detachably seal the recovery system from said booth and said blower means, and to determine a similar unit therefor.
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
(1 ) A powder spray booth and powder recovery/static filter unit configuration comprising:
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, side and end walls, and a floor;
a powder collection chamber in communication with the interior of said booth means;
a clean air chamber sealed from the booth and from the powder collection chamber, said clean air chamber being provided with an opening from the powder collection chamber into said clean air chamber;
static filter means located within said powder collection chamber and operative to effectively prevent powder from entering said clean air chamber;
blower means operative to create a negative pressure in said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion prevention means including a substantially unrestricted flow path from said powder collection chamber into said booth operative to effectively vent any fire created pressure build up within said powder collection chamber into said booth without the occurrence of an explosion.
(2 ) The booth and powder recovery/static filter unit of Claim 1 wherein said flow path from said booth to said powder collection chamber is in the floor of said booth and opens direct-ly into said powder collection chamber, (3 ) The booth and powder recovery/static filter unit of Claim 1 in which said static filter means comprises a plurality of static filter cartridges and further including means for periodically cleaning powder from the surface of said filter cartridges by reversing air flow through the filter cartridges, (4 ) A powder spray booth and powder recovery unit compris-ing:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor;
a powder recovery unit including a powder collection chamber, an air flow path from said booth into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth into said powder collection chamber then upwardly through said filter means into said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion prevention means including a substantially unrestricted flow path between said powder collection chamber and said booth operative to effect-ively vent any fire within said powder collection chamber into said powder booth and thereby prevent any fire created pressure build up and explosion within said powder recovery unit.
( 5) A powder spray booth and powder recovery/static filter unit system comprising:
a booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling area, at least two opposed side walls, and a floor area; and a powder recovery system comprising:
a pair of powder collection chambers each of said powder collection chambers having an upper portion located below said booth, and having an elongated air flow passage communicating with said booth;
two clean air chambers, each of said clean sir chambers being located immediately adjacent opposite a side of one of said powder collection chambers, said clean air chambers having a multi-plicity of individual openings thereinto to provide air flow paths from said collection chamber to respective ones of said clean air chambers;
static filter means associated with each of said openings into said clean air chambers to effectively filter out powder from the air passing therethrough into said clean air chambers;
and blower means to create a negative pressure in said clean air chambers, and to cause powder laden air to be drawn through the air flow passage into the powder collection chamber, and to cause filtering of the powder from said powder laden air by said filter means as air is drawn into said clean air chambers; and means for preventing a fire within said powder collection chambers from causing an explosion, said explosion prevention means including a substantially unrestricted flew path between said powder collection chambers and said booth operative to effectively vent any fire within said powder collection chamber into said powder booth and thereby prevent any fire created pressure build up and explosion within said powder recovery system.
(6 ) The powder spray booth and recovery system of Claim 5 wherein the multiplicity of individual openings into said lean air chambers are located on the underside portion thereof.
(7 ) The powder spray booth and recovery system of Claim 6 which further comprises means to detachably seal the recovery system from said booth and said blower means, and to substitute a similar unit therefor.
(8 ) A powder spray booth and powder recovery unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor which slopes downwardly;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including a first opening of substantial cross section area into said collection chamber, said first opening also permitting excess powder material to flow from said floor into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber;
a second opening from the powder collection chamber into said clean air chamber;
static filter means mounted adjacent said second opening for preventing powder from entering said clean air chamber through said second opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
means for cleaning said filter means whereby accumulated powder is deposited in said collection chamber together with the excess powder for future recovery; and means for preventing a fire within said powder collect-ion chamber from causing an explosion within said collection chamber, said explosion prevention means comprising an unrestrict-ed flow path including said first opening between said powder collection chamber and said booth operative to effectively vent any fire in said powder collection chamber into said booth and thereby prevent any fire within said powder chamber from causing an explosion.
(9 ) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor, a powder collection chamber disposed underneath the booth;
said floor including an opening of substantial cross-sectional area providing an air flow path from said booth into said collection chambers a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static fitter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said static filter means into said clean air chamber.
(10) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor which slopes downwardly;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including an opening of substantial cross-sectional area providing an air flow path directly from said booth into said collection chamber, said opening also permitting excess powder material to flow from said floor into said collect-ion chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
and means for cleaning said static filter means whereby accumulated powder is deposited in said collection chamber to-gether with the excess powder for future recovery.
(11) A powder spray booth and filter unit comprising:
a booth providing a controlled area in which to powder coat substrates, said booth including a ceiling, vertical walls and a floor;
a powder collection chamber disposed at an elevation lower than the floor of the booth;
said booth including an opening of substantial cross-sectional area providing an air flow path directly from said booth into said collection chamber;
a clean air chamber sealed from the booth, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, said clean air chamber having an opening from the powder collection chamber thereinto;
static filter means mounted adjacent said opening for preventing powder from entering said clean air chamber through said opening while permitting air flow from the powder collection chamber into said clean air chamber;
blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber whereby powder entrained in the air during the coat-ing process is separated from the air and collected in the powder collection chamber while substantially powder-free air is dis-charged into said clean air chamber without the occurrence of an air-powder mixture flowing through a conduit or other confined space and thereby creating explosion hazards.
(12) A powder spray booth and powder recovery system comprising:
an enclosed booth for powder coating substrates having walls and a ceiling with apertures selectively formed therein through which substrates are positioned within said booth and powder applied thereto, and having a floor with a first opening formed therein of substantial cross section;
said booth having a length and said first opening extend-ing substantially the length of the booth;
a plenum in direct communication with said opening having a cross section essentially the cross section of said first opening;
a powder collection chamber positioned proximate said plenum;
a second opening of substantial cross section from said plenum into said powder collection chamber;
a clean air chamber positioned proximate said powder collection chamber with a third opening in communication with said powder collection chamber;
static filter means positioned with respect to said third opening to filter powder from air passing into said clean air chamber;
blower means connected to said clean air chamber to (12) (continued) create a negative pressure in said clean air chamber whereby air flows from said booth into said powder collection chamber and into said clean air chamber;
said plenum, powder collection chamber and clean air chamber being assembled into a powder recovery unit positioned under the floor of said booth; and said powder collection chamber being positioned so that the air flow from said plenum is essentially downward and is thereafter angulated from the downward toward a collection point in said collection chamber and thereafter upward to said filters and clean air chamber.
(13) The powder spray booth and powder recovery system of Claim 12 wherein n said collection chamber has side walls sloping downward toward a collection point.
(14) The powder spray booth and powder recovery system of Claim 12 wherein said filter means are static filters of the type which are structurally rigid with sides and a length and which are mounted to have their lengths oriented essentially to the vertical.
(15) A system for collecting airborne powder from a source thereof, said system comprising a powder collection chamber;
a clean air chamber sealed from the source of said airborne powder and from the powder collection chamber, said clean air chamber being provided with an opening from the powder collection chamber into said clean air chamber;
static filter means located within said powder collect-ion chamber and operative to effectively prevent powder from entering said clean air chamber;
blower means operative to create a negative pressure in said clean air chamber; and means for preventing a fire within said powder collect-ion chamber from causing an explosion, said explosion preventing means including a substantially unrestricted flow path from said source into said powder collection chamber operative to effect-ively vent any fire created pressure build-up within said powder collection chamber to said source without the occurrence of an explosion.
(16) A system for collecting airborne powder from a source thereof, said system comprising:
a source of airborne powder;
a powder collection chamber disposed at an elevation lower than the source;
a first opening of substantial cross section area from said source into said collection chamber;
a clean air chamber sealed from the source, said clean air chamber being located adjacent to and above the lowermost portion of said powder collection chamber, a second opening from the powder collection chamber into said clean air chamber;
static filter means mounted adjacent said second open-ing for preventing powder from entering said clean air chamber through said second opening while permitting air flow from the powder collection chamber into said clean air chamber;
(16) (continued) blower means connected to said clean air chamber to create a negative pressure in said clean air chamber, whereby air flows from said booth downwardly into said powder collection chamber then upwardly through said filter means into said clean air chamber;
means for cleaning said filter means whereby accumulated powder is deposited in said collection chamber together with the excess powder for future recovery; and means for preventing a fire within said powder collec-tion chamber from causing an explosion within said collection chamber, said explosion prevention means comprising an unrestricted flow path including said first opening between said powder collection chamber and said booth operative to effectively vent any fire in said powder collection chamber into said booth and thereby prevent any fire within said powder chamber from causing an explosion.
17. A combination powder spray booth and powder recovery/static cartridge filter unit configuration com-prising:
booth means providing a controlled area in which to powder coat substrates, defined generally by a ceiling, front, rear and end walls, and a floor; said front wall having a work opening formed therein, said rear wall being solid and impervious to air flow, said end walls having an opening therein for the transport of workpieces through said booth, and said floor having a substantial opening therein, an air flow passage located beneath said floor opening, said air flow passage being defined at least in part by an inner side wall, a powder collection chamber in close proximity to the booth; said powder collection chamber being located be-neath said air flow passage and in communication therewith, means for removing collected powder from the bottom of said powder collection chamber, a filter chamber located above said powder collec-tion chamber, said filter chamber being separated from said air flow passage by said inner side wall of said air flow passage, a clean air chamber sealed from the booth and from the powder collection chamber, said clean air chamber being provided with a multiplicity of individual openings from the powder collection chamber into said clean air chamber;
static filter means located with said filter chamber and operative to effectively prevent powder from entering said clean air chamber, said static filter means comprising a plurality of static filter cartridges, blower means operative to create a negative pres-sure in said clean air chamber; whereby said blower means draws air entrained powder from said booth through said floor opening, downwardly through said air flow passage into said powder collection chamber, hence upwardly into said filter chamber, through said static filter cartridges, and into said clean air chamber, means for cleaning powder from the surface of said filter cartridges by periodically and sequentially reversing air flow through selected filter cartridges while maintaining air flow from said powder collection chamber to said clean air chamber through the other of said filter cartridges so that there is no net interruption of the air flow from the powder collection chamber into the clean air chamber during the cleaning of said selected filter cartridges; and means for preventing a fire within said powder collection chamber from causing an explosion, said explosion preventing means including a substantially unrestricted air flow path leading from said powder collection chamber through said air flow passage into said booth and operative to effec-tively vent any fire created pressure build-up within said powder collection chamber into said booth without the occur-rence of an explosion.
18. The powder spray booth and powder recovery unit of Claim 17 wherein the multiplicity of individual open-ings into said clean air chambers are located on the under-side portion thereof.
19. The powder spray booth and recovery system of Claim 17 which further comprises means to detachably seal the recovery system from said booth and said blower means, and to determine a similar unit therefor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US96250778A | 1978-11-20 | 1978-11-20 | |
| US962,507 | 1978-11-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1133691A true CA1133691A (en) | 1982-10-19 |
Family
ID=25505979
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA338,235A Expired CA1133691A (en) | 1978-11-20 | 1979-10-23 | Powder spray booth |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5931384B2 (en) |
| CA (1) | CA1133691A (en) |
| DE (1) | DE2946436C2 (en) |
| FR (1) | FR2441433A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076038A (en) * | 2019-05-15 | 2019-08-02 | 金方圆安全技术研究院（苏州）有限公司 | Powder working process coating equipment is datonation-inhibition and datonation-inhibition gas leak protection intelligence control system |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3131565C2 (en) * | 1981-08-10 | 1984-12-13 | Ransburg-Gema AG, St.Gallen | Booth for spray coating objects with powder |
| DE3435619A1 (en) * | 1984-09-28 | 1986-04-03 | Chemische Fabrik Pfersee Gmbh, 8900 Augsburg | METHOD FOR SHRINKING AND FELT-FASTENING TEXTILE MATERIAL CONTAINING KERATINE FIBERS |
| US4723505A (en) * | 1986-03-17 | 1988-02-09 | Nordson Corporation | Powder booth |
| US4704953A (en) * | 1986-11-12 | 1987-11-10 | Nordson Corporation | Powder spray system |
| DE3813259A1 (en) * | 1988-04-20 | 1989-11-02 | Nordson Corp | POWDER RECOVERY DEVICE FOR POWDER COATING PLANTS OR THE LIKE |
| US6522770B1 (en) | 1999-05-19 | 2003-02-18 | Digimarc Corporation | Management of documents and other objects using optical devices |
| DE102005013711B4 (en) | 2005-03-24 | 2022-07-28 | Dürr Systems Ag | Plant for painting objects |
| JP6773388B1 (en) * | 2020-02-25 | 2020-10-21 | パーカーエンジニアリング株式会社 | Paint mist collector |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7246393U (en) * | 1973-08-02 | Andrasfalvy K | Device for powder recovery, especially in systems for electrostatic see powder coating | |
| DE1962698A1 (en) * | 1969-12-13 | 1971-06-24 | Buettner Schilde Haas Ag | Powdered plastics electrostatic spray booth |
| FR2182403A5 (en) * | 1972-04-27 | 1973-12-07 | Air Ind | |
| DE2262084C2 (en) * | 1972-12-19 | 1981-12-10 | Kálmán 7553 Muggensturm Andrásfalvy | Device for powder recovery from a powder-air mixture, especially in systems for electrostatic powder coating |
| JPS6012886B2 (en) * | 1974-07-05 | 1985-04-04 | ダナルドソン、カムパニ、インコーパレイテイド | Air cleaning device with reverse jet cleaning means |
| CH611184A5 (en) * | 1975-09-29 | 1979-05-31 | Gema Ag |
-
1979
- 1979-10-23 CA CA338,235A patent/CA1133691A/en not_active Expired
- 1979-11-17 DE DE2946436A patent/DE2946436C2/en not_active Expired
- 1979-11-19 FR FR7928448A patent/FR2441433A1/en active Granted
- 1979-11-20 JP JP54149645A patent/JPS5931384B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110076038A (en) * | 2019-05-15 | 2019-08-02 | 金方圆安全技术研究院（苏州）有限公司 | Powder working process coating equipment is datonation-inhibition and datonation-inhibition gas leak protection intelligence control system |
| CN110076038B (en) * | 2019-05-15 | 2024-04-09 | 金方圆安全技术研究院（苏州）有限公司 | Explosion suppression and explosion suppression gas leakage protection intelligent control system for powder processing and coating equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2441433B1 (en) | 1984-12-07 |
| DE2946436A1 (en) | 1980-05-29 |
| JPS5573367A (en) | 1980-06-03 |
| JPS5931384B2 (en) | 1984-08-01 |
| FR2441433A1 (en) | 1980-06-13 |
| DE2946436C2 (en) | 1984-03-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry | ||
| MKEX | Expiry |
Effective date: 19991019 |