CA1105603A - Flameproof, weatherproof enclosures for electrical equipment - Google Patents
Flameproof, weatherproof enclosures for electrical equipmentInfo
- Publication number
- CA1105603A CA1105603A CA317,604A CA317604A CA1105603A CA 1105603 A CA1105603 A CA 1105603A CA 317604 A CA317604 A CA 317604A CA 1105603 A CA1105603 A CA 1105603A
- Authority
- CA
- Canada
- Prior art keywords
- flametrap
- enclosure
- body member
- filter element
- metallic
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V25/00—Safety devices structurally associated with lighting devices
- F21V25/12—Flameproof or explosion-proof arrangements
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Spark Plugs (AREA)
- Casings For Electric Apparatus (AREA)
- Filtering Materials (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention provides for flameproof, weatherproof enclosures for electrical equipment for use in hazardous areas where flammable gases or other substances are or may be present in quantities sufficient to produce explosive or ignitable mixtures during normal operation of the electrical equipment.
The enclosure which is of sufficient thickness and mechanical strength to withstand the internal ignition of explosive gases is sealed for weathertightness and is provided with a metallic flametrap having a replaceable filter element therein of metallic foil or mesh structure to provide for cooling and deionizing products of combustion as they pass from within the enclosure to atmosphere through the flametrap. The outer end of the flametrap is sealed by a bursting disc of predetermined burating strength which seals the flametrap against the weather.
A translucent portion may be formed in the enclosure.
The filter element may be in the form of alternate planar strips of metallic foil and crimped strips of metallic foil in face-to ace relation and either folded, stacked or coiled and held together by an annular clamping member.
The invention provides for flameproof, weatherproof enclosures for electrical equipment for use in hazardous areas where flammable gases or other substances are or may be present in quantities sufficient to produce explosive or ignitable mixtures during normal operation of the electrical equipment.
The enclosure which is of sufficient thickness and mechanical strength to withstand the internal ignition of explosive gases is sealed for weathertightness and is provided with a metallic flametrap having a replaceable filter element therein of metallic foil or mesh structure to provide for cooling and deionizing products of combustion as they pass from within the enclosure to atmosphere through the flametrap. The outer end of the flametrap is sealed by a bursting disc of predetermined burating strength which seals the flametrap against the weather.
A translucent portion may be formed in the enclosure.
The filter element may be in the form of alternate planar strips of metallic foil and crimped strips of metallic foil in face-to ace relation and either folded, stacked or coiled and held together by an annular clamping member.
Description
~his invention relate~ to flameproof, weatherproof enclosures for electrical equipmentO
~,Iore specifically the invention provides for flameproof and wea~herproo~ enclosures for electrical equipment including lightin~ fixtures, motors, transformex~, switch gear and other electrical equipment, Zone 1 International ~lectrotechnical Commission Code Symbol Ex' a ~ and Ex'e', for use in hazardous areas where flarnmable gases or other substances are or may be present in quantities sufficient to produce explosive or ..
ignitable mixtures during normal operation of the electrical equipment.
According to the ~nvention a flameproof, weatherproof en~losure for electrical equipment comprising a body member of sufficient mechanical strength to withstand the ignition of explosive gases within said body member and sealed for ~eather tightness,a motallic flametrap cornmunicating at one end with the interior of said body member and sealed at the other end by a disc of predetermined bursting strength to allow immediate operation of the flametrap on ignition of an explosive mixture within the body member a replaceable metallic filter element located in said flametrap, said filter element forming an interlaced cellular structure open in the direction of the ends of the flametrap to cool and deionize products of combustion passing through the flametrap from the interior of the body member The body member may be provided with translucent window means and the filter element may be of metallic foil or mesh 1 ~ 5 ~ ~ 3 structure.
Preferred emboaiments of the invention are illustrated by way of example in the accompanying drawings in which:-Fig. 1 illustr2tes an enclosure for electrical equipment5 with a fl~me trap attached thereto according to the in~ention;
Fig. 2 is a side elevation of an enclosure according to the invention containing electrical lighting fittings and mounted on an adjustable stand;
Fig. 3 is a front elevation of the enclosure of Fig. 2;
l~ Figs. 4 to 7 illustrate several alternative arrangrements of filter elements within the flametrap of the enclosures.
Re~erring to Fig. 1 of the arawings, 1 denotes generally an enclosure for electrical equiprnent such as electrical motor~, lighting fixtures, transformers, switch ~ear and the like electrical equipment of Zone 1 International Electrotechnical Commision Code Symbol Ex'd' and Ex'e' for use in Zone 1 areas (a Zone 1 area being defined as an area where flam~able atmospheres are likely to occur in normal operating conditions).
, The enclosure 1 may be of any shape or size suitable to accommodate particular electrical equipment and it is sealed against the weather.
The enclosure 1 is so constructed as to be of sufficient thickness and mechanical strength as to withstand an internal explosion caused by the presence of M ammable gases or other substances within the enclosure in sufficient quantities to produce an ignitable mixture or explosion during normal operation of the electrical equipment.
The enc~osure 1 is formed by a body member 2 and a flametrap denoted generally at 3.
, , - , . ~
l~S6~3 The body mernber 2 may be fabricatea or cast in rnetal or moulded from reinforced polymeric plastics material and may be provided with a cover member or access paneL to ~rovide access to the interior of the enclosure and the electrical equipment thereina lleans may also be provided on the enclos~lre 1 for attachment to or access for conduits, cables or the like for actuation of the electrical equipment or fittin~s located within the enclosureO
The cover rnember or any a-ccess when provided are sealed to the body member by gaskets or the like to ensure th~t the enclo~ure is weatherproof and capable of containinC an explosion or flame i~nited within the enclo~ure and preventing its propagation externally of the enclosure.
~he flametrap 3 provides for expanded gases or products of combustion within the enclosure to be cooled and deionized as they escape from the enclosure to atmosphere.
The flametrap 3 is formed by a hollow metallic casing connected to the bo~y member 2 as by bolts pas~ing through a flange 5 at one end 6 of the casin~ 4 which is open to pro~ide access and communication between the interior of the flametrap 3 and the interior of the body member 2. The flange 5 is provided with a gasket 7 to seal the casing to the body member.
Alternatively the casing 4 may be integrally formed with the body member 2.
The opposite end, which is the outer end o~ the flametrap 3 is open and sealed by a replaceable~bursting disc 9, which may be of metal, plastics or other suitable material,and which is peripherally secured to the outer end of the flametrap be~ween . , ,:, ::, , ~ ; :
, .. ,... . , . "
6~3 a flallge ~ on the flametrap and an annular me3nber &a clam~ed to the flange ~.
- ~he bursting disc 9 may be in the forrn of a metallic disc -;`
with a complementary sealing membrane in face-to-face relation having a predetermined bursting strength to ensure that it will burst outwardly immediately a predetermined increased pressure within the enclosure i5 caused by ignitlon of an e~plosive mixture so as to allow immediate operation of the flametrap to exhaust the products of combustion from the enclosure to atmosphere after they have passed through the flametrap to be cooled and deionized.
The bursting disc 9 also provides for weatherproo~ing the flametrap.
A filter element 10, which is replaceable, is located within the flametrap 3 and provides for cooling and deionizing products of combustion passing through the flametrap from the interior of the body member 2.
The filter element 10 comprises a metallic ~oil or mesh which may be made of cupro nickel, stainless steel, aluminiumJ
copper or other suitable metal having heat absorption properties and of suf~icient mechanical strength to withstand the explosive gases passing therethrough.
Preferably the element 10 is constructed from two strips o~ metallic foil 11,12 of sufficient thickness and having heat absorption properties to withstand the explosive gases which will pass through it~ One of the strips 11 is planar and the other 12 is crimped and the strips are placed in face-to-face relation and coiled so as to for~ a spira~ circ~llar lattice of cells as illustrated in ~ig. 5. The coil is held together b~J an ~ ~5 annular claming member 13 and the element is inserted into the flametrap which is then sealed by the bursting disc 9.
~ he filter element lOa (Fig.6) is forrrled by stacked alternate planar me-tallic strips lla and crimped metallic strips 12a clamped together by an annular band 13a.
Thefilter element lnb (Fig. 7) is formed from wire mesh 20 which may be woven or knitted into a strip which is then wound spirally or folded in layers to form a mass of predeterrnined porosity which is held together by an annular band 13b.
The ~ilter element is so arranged that a predetermined unrestricted area of lattice is provided open in the direction of the ends of the flametrapO The unrestricted area of lattice or cells being determined by the width and crirnp of the foil which is determined by the particular flammable mixture o~ air and ignitable substance which may nass therethrough.
The outer end of the flametrap 3 i5 sealed off by the disc 9 which has a predetermined bursting strength so that on an internal explosion or ignition of gases it would collapse outwards allowing the spent exhaust products of combustion to escape through the flametrap and enter the atmosphere cooled and deionized to such an extent that any external mixture of air and gas or flammable substance present in the atmosphere would not be ignited~
Figs~ 2 and 3 illustrate an enclosure 1a ~or use with a lighting fitting such as a floodlight in which the-body member 2a is mounted on an adjustable stand 16 and a flametrap 3a is secured to the side of the body member 2a.
A translucent window portion 17 is pro~ided in the body member to allow light to shine througll from a lighting fitting - . . , . ..... - ;. : ~ . .. ~ . -56~3 (not shoYm) located within the body member, The window portion 17 may be of toughened reinforced or moulded glass or plastics material of sufficient streng-th to withstand explosive gases and it is sealed against the weather as by a gasket 18 located around the edge portion of the ~indow.
Variations in the arrangement of the foils or mesh for the filter element may be made without departin~ from the scope of the invention.
~,Iore specifically the invention provides for flameproof and wea~herproo~ enclosures for electrical equipment including lightin~ fixtures, motors, transformex~, switch gear and other electrical equipment, Zone 1 International ~lectrotechnical Commission Code Symbol Ex' a ~ and Ex'e', for use in hazardous areas where flarnmable gases or other substances are or may be present in quantities sufficient to produce explosive or ..
ignitable mixtures during normal operation of the electrical equipment.
According to the ~nvention a flameproof, weatherproof en~losure for electrical equipment comprising a body member of sufficient mechanical strength to withstand the ignition of explosive gases within said body member and sealed for ~eather tightness,a motallic flametrap cornmunicating at one end with the interior of said body member and sealed at the other end by a disc of predetermined bursting strength to allow immediate operation of the flametrap on ignition of an explosive mixture within the body member a replaceable metallic filter element located in said flametrap, said filter element forming an interlaced cellular structure open in the direction of the ends of the flametrap to cool and deionize products of combustion passing through the flametrap from the interior of the body member The body member may be provided with translucent window means and the filter element may be of metallic foil or mesh 1 ~ 5 ~ ~ 3 structure.
Preferred emboaiments of the invention are illustrated by way of example in the accompanying drawings in which:-Fig. 1 illustr2tes an enclosure for electrical equipment5 with a fl~me trap attached thereto according to the in~ention;
Fig. 2 is a side elevation of an enclosure according to the invention containing electrical lighting fittings and mounted on an adjustable stand;
Fig. 3 is a front elevation of the enclosure of Fig. 2;
l~ Figs. 4 to 7 illustrate several alternative arrangrements of filter elements within the flametrap of the enclosures.
Re~erring to Fig. 1 of the arawings, 1 denotes generally an enclosure for electrical equiprnent such as electrical motor~, lighting fixtures, transformers, switch ~ear and the like electrical equipment of Zone 1 International Electrotechnical Commision Code Symbol Ex'd' and Ex'e' for use in Zone 1 areas (a Zone 1 area being defined as an area where flam~able atmospheres are likely to occur in normal operating conditions).
, The enclosure 1 may be of any shape or size suitable to accommodate particular electrical equipment and it is sealed against the weather.
The enclosure 1 is so constructed as to be of sufficient thickness and mechanical strength as to withstand an internal explosion caused by the presence of M ammable gases or other substances within the enclosure in sufficient quantities to produce an ignitable mixture or explosion during normal operation of the electrical equipment.
The enc~osure 1 is formed by a body member 2 and a flametrap denoted generally at 3.
, , - , . ~
l~S6~3 The body mernber 2 may be fabricatea or cast in rnetal or moulded from reinforced polymeric plastics material and may be provided with a cover member or access paneL to ~rovide access to the interior of the enclosure and the electrical equipment thereina lleans may also be provided on the enclos~lre 1 for attachment to or access for conduits, cables or the like for actuation of the electrical equipment or fittin~s located within the enclosureO
The cover rnember or any a-ccess when provided are sealed to the body member by gaskets or the like to ensure th~t the enclo~ure is weatherproof and capable of containinC an explosion or flame i~nited within the enclo~ure and preventing its propagation externally of the enclosure.
~he flametrap 3 provides for expanded gases or products of combustion within the enclosure to be cooled and deionized as they escape from the enclosure to atmosphere.
The flametrap 3 is formed by a hollow metallic casing connected to the bo~y member 2 as by bolts pas~ing through a flange 5 at one end 6 of the casin~ 4 which is open to pro~ide access and communication between the interior of the flametrap 3 and the interior of the body member 2. The flange 5 is provided with a gasket 7 to seal the casing to the body member.
Alternatively the casing 4 may be integrally formed with the body member 2.
The opposite end, which is the outer end o~ the flametrap 3 is open and sealed by a replaceable~bursting disc 9, which may be of metal, plastics or other suitable material,and which is peripherally secured to the outer end of the flametrap be~ween . , ,:, ::, , ~ ; :
, .. ,... . , . "
6~3 a flallge ~ on the flametrap and an annular me3nber &a clam~ed to the flange ~.
- ~he bursting disc 9 may be in the forrn of a metallic disc -;`
with a complementary sealing membrane in face-to-face relation having a predetermined bursting strength to ensure that it will burst outwardly immediately a predetermined increased pressure within the enclosure i5 caused by ignitlon of an e~plosive mixture so as to allow immediate operation of the flametrap to exhaust the products of combustion from the enclosure to atmosphere after they have passed through the flametrap to be cooled and deionized.
The bursting disc 9 also provides for weatherproo~ing the flametrap.
A filter element 10, which is replaceable, is located within the flametrap 3 and provides for cooling and deionizing products of combustion passing through the flametrap from the interior of the body member 2.
The filter element 10 comprises a metallic ~oil or mesh which may be made of cupro nickel, stainless steel, aluminiumJ
copper or other suitable metal having heat absorption properties and of suf~icient mechanical strength to withstand the explosive gases passing therethrough.
Preferably the element 10 is constructed from two strips o~ metallic foil 11,12 of sufficient thickness and having heat absorption properties to withstand the explosive gases which will pass through it~ One of the strips 11 is planar and the other 12 is crimped and the strips are placed in face-to-face relation and coiled so as to for~ a spira~ circ~llar lattice of cells as illustrated in ~ig. 5. The coil is held together b~J an ~ ~5 annular claming member 13 and the element is inserted into the flametrap which is then sealed by the bursting disc 9.
~ he filter element lOa (Fig.6) is forrrled by stacked alternate planar me-tallic strips lla and crimped metallic strips 12a clamped together by an annular band 13a.
Thefilter element lnb (Fig. 7) is formed from wire mesh 20 which may be woven or knitted into a strip which is then wound spirally or folded in layers to form a mass of predeterrnined porosity which is held together by an annular band 13b.
The ~ilter element is so arranged that a predetermined unrestricted area of lattice is provided open in the direction of the ends of the flametrapO The unrestricted area of lattice or cells being determined by the width and crirnp of the foil which is determined by the particular flammable mixture o~ air and ignitable substance which may nass therethrough.
The outer end of the flametrap 3 i5 sealed off by the disc 9 which has a predetermined bursting strength so that on an internal explosion or ignition of gases it would collapse outwards allowing the spent exhaust products of combustion to escape through the flametrap and enter the atmosphere cooled and deionized to such an extent that any external mixture of air and gas or flammable substance present in the atmosphere would not be ignited~
Figs~ 2 and 3 illustrate an enclosure 1a ~or use with a lighting fitting such as a floodlight in which the-body member 2a is mounted on an adjustable stand 16 and a flametrap 3a is secured to the side of the body member 2a.
A translucent window portion 17 is pro~ided in the body member to allow light to shine througll from a lighting fitting - . . , . ..... - ;. : ~ . .. ~ . -56~3 (not shoYm) located within the body member, The window portion 17 may be of toughened reinforced or moulded glass or plastics material of sufficient streng-th to withstand explosive gases and it is sealed against the weather as by a gasket 18 located around the edge portion of the ~indow.
Variations in the arrangement of the foils or mesh for the filter element may be made without departin~ from the scope of the invention.
Claims (6)
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A flameproof, weatherproof enclosure for electrical equipment comprising a body member of sufficient mechanical strength to withstand the ignition of explosive gases within said body member and sealed for water tightness, a metallic flametrap extending from said body member and communicating at one end with the interior of said body member and sealed at the outer end by a disc of predetermined bursting strength to allow immediate operation of the flametrap on ignition of an explosive mixture within the body member, a replaceable metallic filter element located in said flametrap said filter element formed by an interlaced cellular structure open in the direction of the ends of the flametrap to cool and deionize products of combustion passing through the flametrap from the interior of the body member.
2. An enclosure as claimed in claim 1 wherein said bursting disc is replaceable and comprises a metallic disc with a complementary sealing membrane in face-to-face relation, said disc and membrane peripherally secured in sealing relationship to the outer end of the flametrap between a flange on the flametrap and an annular ring clamped to the flange.
3. An enclosure as claimed in claim 1 wherein the filter element comprises a planar strip of metallic foil and a crimped strip of metallic foil laid in face-to-face relation and spirally wound to form an interlaced cellular structure, said structure clamped together by an annular ring.
4. An enclosure as claimed in claim 1 wherein the filter element comprises a plurality of strips of metallic foil laid in face-to-face relation each alternate strip being crimped.
5. An enclosure as claimed in claim 1 wherein the filter element is formed from a mass of wire mesh of predetermined porosity.
6. An enclosure as claimed in claim 1 wherein a translucent portion is formed in the body member.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB5130777 | 1977-12-09 | ||
| GB51307 | 1977-12-09 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1105603A true CA1105603A (en) | 1981-07-21 |
Family
ID=10459484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA317,604A Expired CA1105603A (en) | 1977-12-09 | 1978-12-08 | Flameproof, weatherproof enclosures for electrical equipment |
Country Status (13)
| Country | Link |
|---|---|
| JP (1) | JPS54116104A (en) |
| AU (1) | AU542223B2 (en) |
| BE (1) | BE872614A (en) |
| CA (1) | CA1105603A (en) |
| DE (1) | DE2852113B2 (en) |
| DK (1) | DK528778A (en) |
| ES (1) | ES475810A1 (en) |
| FR (1) | FR2411538A1 (en) |
| IT (1) | IT1111094B (en) |
| NL (1) | NL176213C (en) |
| NO (1) | NO148135C (en) |
| SE (1) | SE432042B (en) |
| ZA (1) | ZA786698B (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58394U (en) * | 1981-06-25 | 1983-01-05 | 株式会社東芝 | tank type lightning arrester |
| DE3311252A1 (en) * | 1983-03-28 | 1984-10-04 | Joachim Dr.-Ing. 8070 Ingolstadt Hess | Plastic housing |
| US4600114A (en) * | 1983-10-03 | 1986-07-15 | Dabich Robert M | Thermo expansion compensator |
| DE3412274A1 (en) * | 1984-04-02 | 1985-10-10 | Ceag Licht- Und Stromversorgungstechnik Gmbh, 4770 Soest | CLOSED HOUSING FOR RECEIVING ELECTRICAL APPARATUS |
| DE102010015674A1 (en) * | 2010-04-21 | 2011-10-27 | Wabco Gmbh | A housing with a deformation area for pressure equalization and an arrangement of a sealing element in the housing |
| CN110146656B (en) * | 2019-06-05 | 2020-06-05 | 无锡格林通安全装备有限公司 | Explosion-proof breathing device of gas detector |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041449B (en) * | 1954-12-20 | 1958-10-23 | Westinghouse Electric Corp | Explosion-proof container made of metal, in particular housing for firedamp protection |
| AU6045565A (en) * | 1965-06-22 | 1966-12-22 | Jennings Radio Manufacturing Corporation | Expansible vacuum envelope for electrical devices |
| US3675007A (en) * | 1969-10-20 | 1972-07-04 | Appleton Electric Co | Explosion proof lighting fixture |
| FR2320026A1 (en) * | 1975-08-01 | 1977-02-25 | Cemse | Protective envelope for electric device - is used in explosive environment and comprises two cylindrical elements sealed together |
-
1978
- 1978-11-27 DK DK528778A patent/DK528778A/en not_active Application Discontinuation
- 1978-11-27 NO NO783974A patent/NO148135C/en unknown
- 1978-11-28 ZA ZA00786698A patent/ZA786698B/en unknown
- 1978-12-01 SE SE7812390A patent/SE432042B/en unknown
- 1978-12-01 DE DE2852113A patent/DE2852113B2/en not_active Withdrawn
- 1978-12-01 AU AU42128/78A patent/AU542223B2/en not_active Expired
- 1978-12-06 IT IT52214/78A patent/IT1111094B/en active
- 1978-12-07 ES ES475810A patent/ES475810A1/en not_active Expired
- 1978-12-08 NL NLAANVRAGE7812006,A patent/NL176213C/en not_active IP Right Cessation
- 1978-12-08 BE BE2057474A patent/BE872614A/en not_active IP Right Cessation
- 1978-12-08 FR FR7834563A patent/FR2411538A1/en active Granted
- 1978-12-08 CA CA317,604A patent/CA1105603A/en not_active Expired
- 1978-12-09 JP JP15297778A patent/JPS54116104A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| DK528778A (en) | 1979-06-10 |
| NO783974L (en) | 1979-06-12 |
| FR2411538B1 (en) | 1982-06-25 |
| NO148135B (en) | 1983-05-02 |
| FR2411538A1 (en) | 1979-07-06 |
| NL7812006A (en) | 1979-06-12 |
| ZA786698B (en) | 1979-10-31 |
| AU542223B2 (en) | 1985-02-14 |
| NL176213C (en) | 1985-03-01 |
| DE2852113A1 (en) | 1979-06-13 |
| BE872614A (en) | 1979-03-30 |
| SE7812390L (en) | 1979-06-10 |
| IT1111094B (en) | 1986-01-13 |
| ES475810A1 (en) | 1979-11-01 |
| SE432042B (en) | 1984-03-12 |
| IT7852214A0 (en) | 1978-12-06 |
| NL176213B (en) | 1984-10-01 |
| NO148135C (en) | 1983-08-10 |
| JPS54116104A (en) | 1979-09-10 |
| AU4212878A (en) | 1979-06-14 |
| DE2852113B2 (en) | 1981-07-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |