US2789238A - Flame arrestor for dynamoelectric machines - Google Patents
Flame arrestor for dynamoelectric machines Download PDFInfo
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- US2789238A US2789238A US447248A US44724854A US2789238A US 2789238 A US2789238 A US 2789238A US 447248 A US447248 A US 447248A US 44724854 A US44724854 A US 44724854A US 2789238 A US2789238 A US 2789238A
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- 238000007373 indentation Methods 0.000 description 51
- 239000000463 material Substances 0.000 description 14
- 239000004020 conductor Substances 0.000 description 11
- 239000012530 fluid Substances 0.000 description 10
- 230000002596 correlated effect Effects 0.000 description 5
- 238000004880 explosion Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- 239000003570 air Substances 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K5/00—Casings; Enclosures; Supports
- H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
- H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
- H02K5/136—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas explosion-proof
Definitions
- This invention relates to explosion-preventing means, and more particularly .to improved means for preventing the dangers of fire and explosions from such machines.
- the layers are made SLllllClEIlllY wide and close together so that any flame travelling between the layers will be cooled below the ignition point before reaching the end of the layers.
- These means generally called flame arrestors, are placed so as to completely obstruct all passages between the motor enclosure and the outside atmosphere, so that any flame originating within the motor enclosure must pass between the layers of flame arrestors to reach the outside.
- name arrestors have proved a relatively expensive item, both as to material required and assembly.
- Such means have resulted in a decrease in the surface area available. It will be seenztherefore that it would be highly desirable to preserve the fiame-extinguishing features of the prior an intact, while materially decreasing both the cost of thematerials and the cost of assembly of'the flame arrestor.
- This invention in its broadest aspect, provides a plurality of superimposed layers of-an uninfiammable highly heat-conductive material. indentations in the layer, the thickness of the layer of material, and the shape of the indentations are made such that it is impossible for the indentations of one layer to nest completely-in the indentations or the next layer. Thus, no matter whether the indentations coincide, there will always be sutficient space provided, because of the indentations betweecn layers, to
- the layers may be formed either from a continuous strip of material spirally wound or from annular strips of material superimposed upon each other.
- Figure l is a side view, partly in cross section, of a dynamoelectric machine embodying the improved flamearresting means of this invention
- FIG. 2 is a view in perspective of the improved flamearresting means of this invention.
- FIG. 3 is a view in perspective of the improved flamearresting means of this invention.
- Figure 4 is an enlarged view in perspective of a small section of the means shown in Figure 3;
- Figure 5 is a plane View of a modification of the improved fiame arresting means.
- Figure 6 is a view along line b-b in Figure 5.
- a dynamoelectric machine 1 which may be, for instance, a direct current series motor as shown. It will be understood that this type of machine is used for illustrative purposes only, and that the flame arresting means of this invention is equally effective in other types of dynamoelectric machines.
- Motor 1 has a pair of end shields 2 and 3 which have, respectively, circular peripheral surfaces 4 and 5 to provide positioning surfaces for the stator poles 6 of motor 1. This arrangement is more fully described in application Serial No. 339,991, filed March 3, i953, now Patent No. 2,683,826, by the present applicant and assigned'to the assignee of this invention.
- Laminated core structures 7 may be formed on the outside of poles 6 with the individual core structures 7 being connected by an annular yoke 8 surrounding them. Coils, such as those indicated-at 9, may be wound about cores 7 on the outside of pole pieces 6.
- the pole pieces form a bore lit for a rotor 11 having windings 12.
- a commutator 13 is provided having bars 14 which are connected (not shown) to the armature windings 12.
- the conventional brush mecham'sms and electrical leads will of course be provided in conjunction with commutator 13. These have however been omitted from the drawing so that the invention might be brought out with greater clarity.
- a shaft 15 is secured to the assembly of commutator 14 and armature 11, and is rotatably mounted in bearings 16 and 17 which are respectively positioned in recesses 18 and 19 of end shields 2 and 3 respectively.
- a housing member 20 is positioned over the motor assembly against end shield 3. Ventilation inlets 21 are provided between housing 26 and end shield 3andventilation outlets 22 are provided at the other end of housing 20.
- a fan member 23 is secured to shaft 15 at 24by any desired means such as a nut 25 secured on threaded portion 26 of shaft 15. it will be observed that housing 20 is so formed as to provide a chamber 27 between end shields 2 and end 28 of housing 26 in which fan 23 will rotate.
- Each flame arrestor 31 is made up of a strip of noninflammable material having high heat conductive qualities, such as, for instance, brass.
- indentations 33 which preferably extend the entire width of the strip.
- indentations 33 are substantially U-shaped. It will, however, be understood that these indentations may be of various other shapes with equally beneficial re sults.
- indentations 33 are shape be such with respect to the thickness 34 of the strip that the outer configuration 35 of each indentation be sufliciently larger than the recess 36 formed on the other side of the strip by the indentation so that it will not be possible for any indentation 33 to nest within the indentation of a superimposed strip.
- This situation is illustrated at 37 in Figure 2 and at 38 in Figure 3.
- indentations 33 and the thickness 34 of the strip 32 it is possible to wind the strip upon itself in a spiral as shown, and to have the indentations maintain each superimposed layer at a proper distance so as to avoid substantial obstruction of the ventilation of the machine while providing a large amount of surface area of the strip 32 in order to absorb heat from any flame passing through.
- Fi ures 5 and 6 of the drawin there is shown a mod fication oi the invention which will be described using like numerals for like arts.
- a plurality of annular strips such as that indicated at 39. Each of these will have indentationsr,
- the improved flame-arresting means of this invention may be used successfully in almost am t pe of dvnarnoelectric machine. and that its application will not be limited to tynes such as that shown in he drawin for illustrative purposes.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin directly superimposed layers of non-inflammable highly heat conductive material, said layers having spaced indentations formed therein thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer and being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin directly super-imposed layers of non-inflammable highly heat conductive material, said layers having equispaced indentations formed therein thereby to space adiacent layers, each of said indentations extending substantially across the width of a layer.
- the sha e of said indentations and the thickness of said material being so correlated that the space between a iacent layers will remain substantially the same when indentations in adiaceut layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means.
- said means comprising a plurality of relatively thin directly superimposed layers of non-inflammable highly heat-conductive material, said layers having equispaced U-shaped indentations extending substantially across the width of said layers thereby to space adjacent layers. said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adiacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat-condutive material spirally wound into directly superimposed layers, said strip having spaced indentations formed therein thereby to space adjacent layers, said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat conductive material spirally wound into directly superimposed layers, said strip having equispaced indentations thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat-conductive material spirally wound into superimposed layers said strip having equispaced U-shaped indentations extending substantially across the width thereof thereby to space adjacent layers, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin annular strips of non-inflammable highly heat-conductive material arranged as directly superimposed layers, each of said strips having spaced indentations formed therein thereby to space adjacent layers, said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin annular strips of non-inflammable highly heat-conductive material arranged as directly superimposed layers, said strips having equispaced indentations therein thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
- flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plu- Iality of relatively thin annular strips of non-inflammable highly heat-conductive material spirally wound into directly superimposed layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
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- Insulation, Fastening Of Motor, Generator Windings (AREA)
Description
April 15, 1957 J. H. STAAK 2,789,238
FLAME ARRESTOR FOR DYNAMOELECTRIC MACHINES Filed Aug. 2, 1954 I, m: s mm;
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United States Patent FLAME ARRESTOR FOR DYNA-MOELECTRIC MACHlN'ES Julius H. Steak, Fort Wayne, Ind., assignor to General Electric Company, a corporation of New York Application August 2, 1954, Serial No. 447,248
Claims. (Cl. 310--88) This invention relates to explosion-preventing means, and more particularly .to improved means for preventing the dangers of fire and explosions from such machines.
It is frequently necessary to use dynamoelectric machines which are ventilated with the ambient air under circumstances where the air surrounding the machines may contain sufi'icient inflammable material so that a spark or frame originatingin the machine might, if allowed to travel outside the confines thereof, cause an explosion. 'It has been a common practice to provide machines used in such atmospheres with means to prevent any flames originating within the machines from escaping outside, particularly through the ventilating openings. These means generally take the form of a plurality of layers of non-inflammable highly heat-conductive material, each layer being spaced from each other layer so as to provide a path therebetween. The layers are made SLllllClEIlllY wide and close together so that any flame travelling between the layers will be cooled below the ignition point before reaching the end of the layers. These means, generally called flame arrestors, are placed so as to completely obstruct all passages between the motor enclosure and the outside atmosphere, so that any flame originating within the motor enclosure must pass between the layers of flame arrestors to reach the outside.
In the past, name arrestors have proved a relatively expensive item, both as to material required and assembly. To meet the prime requirement of adequate surface area with which the flame must come in contact, it has been the custom to provide special means to space each layer from each other layer, or else to corrugate one strip while providing another strip which will "lit in between each two superimposed turns of .the first strip to prevent any nesting. Such means have resulted in a decrease in the surface area available. it will be seenztherefore that it would be highly desirable to preserve the fiame-extinguishing features of the prior an intact, while materially decreasing both the cost of thematerials and the cost of assembly of'the flame arrestor.
It is, therefore, an object of this invention to provide improved flame arresting means for dynamoelectric machines.
Further objects and advantages of this invention will be come apparent and the invention will be better understood by reference to the foilowing description and the accompanying drawing, and the features of novelty which characterize this invention will be pointed out with particularity in the claims annexed to and forming a part of this specification.
This invention, in its broadest aspect, provides a plurality of superimposed layers of-an uninfiammable highly heat-conductive material. indentations in the layer, the thickness of the layer of material, and the shape of the indentations are made such that it is impossible for the indentations of one layer to nest completely-in the indentations or the next layer. Thus, no matter whether the indentations coincide, there will always be sutficient space provided, because of the indentations betweecn layers, to
preserve the desired amount of surface area in order properly to extinguish flames emanating from the dynamo electric machine. The layers may be formed either from a continuous strip of material spirally wound or from annular strips of material superimposed upon each other.
In the drawing,
Figure l is a side view, partly in cross section, of a dynamoelectric machine embodying the improved flamearresting means of this invention;
Figure 2 is a view in perspective of the improved flamearresting means of this invention;
Figure 3 is a view in perspective of the improved flamearresting means of this invention;
Figure 4 is an enlarged view in perspective of a small section of the means shown in Figure 3;
Figure 5 is a plane View of a modification of the improved fiame arresting means; and
Figure 6 is a view along line b-b in Figure 5.
Referring now to Figures 1 through 4 of the drawing, there is shown a dynamoelectric machine 1, which may be, for instance, a direct current series motor as shown. It will be understood that this type of machine is used for illustrative purposes only, and that the flame arresting means of this invention is equally effective in other types of dynamoelectric machines. Motor 1 has a pair of end shields 2 and 3 which have, respectively, circular peripheral surfaces 4 and 5 to provide positioning surfaces for the stator poles 6 of motor 1. This arrangement is more fully described in application Serial No. 339,991, filed March 3, i953, now Patent No. 2,683,826, by the present applicant and assigned'to the assignee of this invention.
Laminated core structures 7 may be formed on the outside of poles 6 with the individual core structures 7 being connected by an annular yoke 8 surrounding them. Coils, such as those indicated-at 9, may be wound about cores 7 on the outside of pole pieces 6. The pole pieces form a bore lit for a rotor 11 having windings 12. A commutator 13 is provided having bars 14 which are connected (not shown) to the armature windings 12. The conventional brush mecham'sms and electrical leads will of course be provided in conjunction with commutator 13. These have however been omitted from the drawing so that the invention might be brought out with greater clarity.
A shaft 15 is secured to the assembly of commutator 14 and armature 11, and is rotatably mounted in bearings 16 and 17 which are respectively positioned in recesses 18 and 19 of end shields 2 and 3 respectively. A housing member 20 is positioned over the motor assembly against end shield 3. Ventilation inlets 21 are provided between housing 26 and end shield 3andventilation outlets 22 are provided at the other end of housing 20. A fan member 23 is secured to shaft 15 at 24by any desired means such as a nut 25 secured on threaded portion 26 of shaft 15. it will be observed that housing 20 is so formed as to provide a chamber 27 between end shields 2 and end 28 of housing 26 in which fan 23 will rotate. When the motor coils are energized to cause armature 12 and shaft 15 to rotate, fan 23 will draw air in through openings 21; this air will then pass through the motor to cool the stator core and windings, as indicated by arrows 29, and will be expelled through openings 22, as in dicated by arrows 30.
it is well known in the art that when dynamoelectric machinery is used in atmospheres containing inflammable matter, such as gasoline fumes, there arises a. danger of explosion from sparks which under various circumstances may originate almost anywhere in the machine, and which are created under ordinary running conditions by the contact of brush mechanisms on commutator 14. Where the atmosphere outside the machine is permitted to enter it such sparks may ignite the inflammable material and, if the flames so created are permitted to reach the outside atmosphere a larger explosion may occur. For these reasons flame arrestors 31 are provided at each end of the motor so as to separate entire motor assembly from the openings 21 and 22. in the embodiment shown in Figure 1 the flame arrestor is located between the outside of pole pieces 6 and the inner surface of housing 20.
Each flame arrestor 31 is made up of a strip of noninflammable material having high heat conductive qualities, such as, for instance, brass. At regularly spaced intervals along the length of strip 32 there are provided indentations such as 33 which preferably extend the entire width of the strip. As shown in the instant embodiment, indentations 33 are substantially U-shaped. It will, however, be understood that these indentations may be of various other shapes with equally beneficial re sults. The feature of prime importance as to indentations 33 is that their shape be such with respect to the thickness 34 of the strip that the outer configuration 35 of each indentation be sufliciently larger than the recess 36 formed on the other side of the strip by the indentation so that it will not be possible for any indentation 33 to nest within the indentation of a superimposed strip. This situation is illustrated at 37 in Figure 2 and at 38 in Figure 3. By so proportioning indentations 33 and the thickness 34 of the strip 32 it is possible to wind the strip upon itself in a spiral as shown, and to have the indentations maintain each superimposed layer at a proper distance so as to avoid substantial obstruction of the ventilation of the machine while providing a large amount of surface area of the strip 32 in order to absorb heat from any flame passing through. Location 37 in Fig. 2 and location 38 in Figure 3 illustrate that even when two su erim osed indentations 33 are directly one above the other. the distance between the su erimposed strips will not be appreciably affected thereby. It therefore becomes unnecessary to provide a stri intermediate each of the superimposed layers of strip 32. s nce the strip 32 may be wound entirely at random without fear that ne ting indentations will either unduly obstruct the ven tilation or lower the efliciency of the flame arrestor.
Referring now to Fi ures 5 and 6 of the drawin there is shown a mod fication oi the invention which will be described using like numerals for like arts. In lieu of a continuous strip wound in s iral fashion there ma be provided a plurality of annular strips such as that indicated at 39. Each of these will have indentationsr,
it will be seen that the improved flame-arresting means of this invention may be used successfully in almost am t pe of dvnarnoelectric machine. and that its application will not be limited to tynes such as that shown in he drawin for illustrative purposes.
ments and modifications may be made without departing from the scope of the invention as defined in theappended claims.
What I claim as new and desire to secure by Letters Pattern of the United States iSZ Also, while the invention has been explained by describin particular embodiments thereof. it will be apparent that improve 1. In a dynamoelectric machine having a housing with an opening therein, flame arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin directly superimposed layers of non-inflammable, highly heat-conductive material, said layers having spaced indentations formed therein thereby to space adjacent layers, said indentations bein; so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
2. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin directly superimposed layers of non-inflammable highly heat conductive material, said layers having spaced indentations formed therein thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer and being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
3. In a dynamoelectric machine having a housing with an opening therein, flame arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin directly super-imposed layers of non-inflammable highly heat conductive material, said layers having equispaced indentations formed therein thereby to space adiacent layers, each of said indentations extending substantially across the width of a layer. the sha e of said indentations and the thickness of said material being so correlated that the space between a iacent layers will remain substantially the same when indentations in adiaceut layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
4. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means. said means comprising a plurality of relatively thin directly superimposed layers of non-inflammable highly heat-conductive material, said layers having equispaced U-shaped indentations extending substantially across the width of said layers thereby to space adjacent layers. said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adiacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
5. In a dynamoelectn'c machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat-condutive material spirally wound into directly superimposed layers, said strip having spaced indentations formed therein thereby to space adjacent layers, said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
6. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat conductive material spirally wound into directly superimposed layers, said strip having equispaced indentations thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
7. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a relatively thin strip of non-inflammable highly heat-conductive material spirally wound into superimposed layers said strip having equispaced U-shaped indentations extending substantially across the width thereof thereby to space adjacent layers, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other.
8. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin annular strips of non-inflammable highly heat-conductive material arranged as directly superimposed layers, each of said strips having spaced indentations formed therein thereby to space adjacent layers, said indentations being so formed that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
9. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plurality of relatively thin annular strips of non-inflammable highly heat-conductive material arranged as directly superimposed layers, said strips having equispaced indentations therein thereby to space adjacent layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
10. In a dynamoelectric machine having a housing with an opening therein, flame-arresting means adapted to be positioned between said machine and said opening so that all fluid flow from said machine to said opening must pass through said means, said means comprising a plu- Iality of relatively thin annular strips of non-inflammable highly heat-conductive material spirally wound into directly superimposed layers, each of said indentations extending substantially across the width of a layer, the shape of said indentations and the thickness of said material being so correlated that the space between adjacent layers will remain substantially the same when indentations in adjacent layers respectively are aligned and in contact with each other as when they are out of alignment and contact with each other.
References Cited in the file of this patent UNITED STATES PATENTS 1,693,958 Patten Dec. 4, 1928 1,799,565 Patterson Apr. 7, 1931 1,720,364 Holmes July 9, 1929
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US447248A US2789238A (en) | 1954-08-02 | 1954-08-02 | Flame arrestor for dynamoelectric machines |
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US447248A US2789238A (en) | 1954-08-02 | 1954-08-02 | Flame arrestor for dynamoelectric machines |
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US3018019A (en) * | 1959-08-07 | 1962-01-23 | Gen Motors Corp | Coiled flame arrester |
US3078805A (en) * | 1959-07-31 | 1963-02-26 | Goulds Pumps | Motor pump unit |
DE2618692A1 (en) * | 1975-04-28 | 1976-11-11 | Villamos Ipari Kutato Intezet | ELECTRIC MACHINE WITH COMPRESSED AIR COOLING |
US4015954A (en) * | 1975-12-29 | 1977-04-05 | John Zink Company | Laminar flow flame arrestor |
FR2431211A1 (en) * | 1978-07-11 | 1980-02-08 | Baugier Jean Pierre | Protection system for motor in explosive atmosphere - has two half-sheathings complying with safety requirements and ignition-confining laminae with ventilation passages |
US4348604A (en) * | 1980-06-13 | 1982-09-07 | General Dynamics Corp. | Totally enclosed air cooled electrical machines |
US4484690A (en) * | 1982-03-08 | 1984-11-27 | Service Machine Co. | Flame arresting ventilated wall for an explosion-proof enclosure |
US4858255A (en) * | 1986-05-23 | 1989-08-22 | Premier Pump & Pool Products, Inc. | Hydrotherapy apparatus having preheated air agitation feature |
US4921118A (en) * | 1987-09-04 | 1990-05-01 | Courtney P. Grover, III | Manufacture of filling material |
US5415233A (en) * | 1992-06-30 | 1995-05-16 | Chem-Mech | Flame arrestor apparatus |
US20020053838A1 (en) * | 2000-05-30 | 2002-05-09 | Kazuma Okuda | Outer rotor type motor / generator |
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US20040070291A1 (en) * | 2002-10-11 | 2004-04-15 | Siemens Westinghouse Power Corporation | Dynamoelectric machine with arcuate heat exchanger and related methods |
US20050152795A1 (en) * | 2004-01-13 | 2005-07-14 | Friel Daniel D.Sr. | Efficient food slicer |
KR100918021B1 (en) | 2008-09-19 | 2009-09-18 | 유니테크 주식회사 | Explosive relief valve |
US20100284150A1 (en) * | 2009-05-05 | 2010-11-11 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management using sintered elements |
US20100288467A1 (en) * | 2009-05-14 | 2010-11-18 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management by heat exchange |
US20100326532A1 (en) * | 2008-02-29 | 2010-12-30 | Corning Incorporated | Methods and Devices for Falling Film Reactors With Integrated Heat Exchange |
US9205292B2 (en) | 2013-09-09 | 2015-12-08 | Empyreus Solutions Llc | Flame arrester with flexible porous cover |
US9731155B2 (en) | 2014-09-05 | 2017-08-15 | Empyreus Solutions Llc | Flame arrester with porous sleeve |
WO2018219712A1 (en) * | 2017-06-01 | 2018-12-06 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing with inner pressure relief |
WO2020007689A1 (en) * | 2018-07-06 | 2020-01-09 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing having pressure-relief means |
WO2020043468A1 (en) * | 2018-08-27 | 2020-03-05 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing |
RU2792758C2 (en) * | 2018-07-06 | 2023-03-23 | Р. Шталь Шальтгерете Гмбх | Explosion-proof pressure relief housing |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1693958A (en) * | 1926-09-02 | 1928-12-04 | John S Patten | Breather cover for tanks |
US1720364A (en) * | 1915-05-06 | 1929-07-09 | Jeffrey Mfg Co | Explosionproof mining apparatus |
US1799565A (en) * | 1927-10-24 | 1931-04-07 | Warren City Tank & Boiler Comp | Vent and flame arrester |
-
1954
- 1954-08-02 US US447248A patent/US2789238A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1720364A (en) * | 1915-05-06 | 1929-07-09 | Jeffrey Mfg Co | Explosionproof mining apparatus |
US1693958A (en) * | 1926-09-02 | 1928-12-04 | John S Patten | Breather cover for tanks |
US1799565A (en) * | 1927-10-24 | 1931-04-07 | Warren City Tank & Boiler Comp | Vent and flame arrester |
Cited By (41)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3078805A (en) * | 1959-07-31 | 1963-02-26 | Goulds Pumps | Motor pump unit |
US3018019A (en) * | 1959-08-07 | 1962-01-23 | Gen Motors Corp | Coiled flame arrester |
DE2618692A1 (en) * | 1975-04-28 | 1976-11-11 | Villamos Ipari Kutato Intezet | ELECTRIC MACHINE WITH COMPRESSED AIR COOLING |
US4015954A (en) * | 1975-12-29 | 1977-04-05 | John Zink Company | Laminar flow flame arrestor |
FR2337307A1 (en) * | 1975-12-29 | 1977-07-29 | Zink Co John | FLAME PROTECTION SCREEN |
FR2431211A1 (en) * | 1978-07-11 | 1980-02-08 | Baugier Jean Pierre | Protection system for motor in explosive atmosphere - has two half-sheathings complying with safety requirements and ignition-confining laminae with ventilation passages |
US4348604A (en) * | 1980-06-13 | 1982-09-07 | General Dynamics Corp. | Totally enclosed air cooled electrical machines |
US4484690A (en) * | 1982-03-08 | 1984-11-27 | Service Machine Co. | Flame arresting ventilated wall for an explosion-proof enclosure |
US4858255A (en) * | 1986-05-23 | 1989-08-22 | Premier Pump & Pool Products, Inc. | Hydrotherapy apparatus having preheated air agitation feature |
US4921118A (en) * | 1987-09-04 | 1990-05-01 | Courtney P. Grover, III | Manufacture of filling material |
US5415233A (en) * | 1992-06-30 | 1995-05-16 | Chem-Mech | Flame arrestor apparatus |
US20020053838A1 (en) * | 2000-05-30 | 2002-05-09 | Kazuma Okuda | Outer rotor type motor / generator |
US6784575B2 (en) * | 2000-05-30 | 2004-08-31 | Honda Giken Kogyo Kabushiki Kaisha | Air-cooled outer rotor type motor/generator contained within a crank pulley of an engine |
WO2003026782A1 (en) * | 2001-09-25 | 2003-04-03 | Precision Combustion, Inc. | Mixer/flow conditioner |
US20040070291A1 (en) * | 2002-10-11 | 2004-04-15 | Siemens Westinghouse Power Corporation | Dynamoelectric machine with arcuate heat exchanger and related methods |
US7247959B2 (en) * | 2002-10-11 | 2007-07-24 | Siemens Power Generation, Inc. | Dynamoelectric machine with arcuate heat exchanger and related methods |
CN100548598C (en) * | 2004-01-13 | 2009-10-14 | 埃奇克拉夫特公司 | Efficient food slicer |
US7174822B2 (en) * | 2004-01-13 | 2007-02-13 | Edgecraft Corporation | Efficient food slicer |
US20050152795A1 (en) * | 2004-01-13 | 2005-07-14 | Friel Daniel D.Sr. | Efficient food slicer |
US7685914B2 (en) | 2004-01-13 | 2010-03-30 | Edgecraft Corporation | Efficient food slicer |
US20070101850A1 (en) * | 2004-01-13 | 2007-05-10 | Friel Daniel D Sr | Efficient food slicer |
US20100326532A1 (en) * | 2008-02-29 | 2010-12-30 | Corning Incorporated | Methods and Devices for Falling Film Reactors With Integrated Heat Exchange |
US8211377B2 (en) | 2008-02-29 | 2012-07-03 | Corning Incorporated | Methods and devices for falling film reactors with integrated heat exchange |
KR100918021B1 (en) | 2008-09-19 | 2009-09-18 | 유니테크 주식회사 | Explosive relief valve |
US8992649B2 (en) | 2009-05-05 | 2015-03-31 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management using sintered elements |
US20100284150A1 (en) * | 2009-05-05 | 2010-11-11 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management using sintered elements |
US8512430B2 (en) * | 2009-05-05 | 2013-08-20 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management using sintered elements |
US9250023B2 (en) | 2009-05-14 | 2016-02-02 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management by heat exchange |
US20100288467A1 (en) * | 2009-05-14 | 2010-11-18 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management by heat exchange |
US9863718B2 (en) | 2009-05-14 | 2018-01-09 | Cooper Technologies Company | Explosion-proof enclosures with active thermal management by heat exchange |
US9511247B2 (en) | 2013-09-09 | 2016-12-06 | Empyreus Solutions Llc | Flame arrester with porous cover |
US9205292B2 (en) | 2013-09-09 | 2015-12-08 | Empyreus Solutions Llc | Flame arrester with flexible porous cover |
US9731155B2 (en) | 2014-09-05 | 2017-08-15 | Empyreus Solutions Llc | Flame arrester with porous sleeve |
US11252830B2 (en) | 2017-06-01 | 2022-02-15 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing with inner pressure relief |
WO2018219712A1 (en) * | 2017-06-01 | 2018-12-06 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing with inner pressure relief |
CN110832717A (en) * | 2017-06-01 | 2020-02-21 | R.施塔尔开关设备有限责任公司 | Explosion-proof housing with internal pressure relief |
WO2020007689A1 (en) * | 2018-07-06 | 2020-01-09 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing having pressure-relief means |
CN112514186A (en) * | 2018-07-06 | 2021-03-16 | R.施塔尔开关设备有限责任公司 | Explosion-proof housing with pressure relief |
RU2792758C2 (en) * | 2018-07-06 | 2023-03-23 | Р. Шталь Шальтгерете Гмбх | Explosion-proof pressure relief housing |
WO2020043468A1 (en) * | 2018-08-27 | 2020-03-05 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing |
US11969613B2 (en) | 2018-08-27 | 2024-04-30 | R. Stahl Schaltgeräte GmbH | Explosion-proof housing |
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