US2446498A - Liquid air boiler - Google Patents

Liquid air boiler Download PDF

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US2446498A
US2446498A US607349A US60734945A US2446498A US 2446498 A US2446498 A US 2446498A US 607349 A US607349 A US 607349A US 60734945 A US60734945 A US 60734945A US 2446498 A US2446498 A US 2446498A
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liquid air
pipe
tank
tubes
air
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George T Underwood
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F17C2201/0119—Shape cylindrical with flat end-piece
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/018—Supporting feet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
    • F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
    • F17C2205/0323—Valves
    • F17C2205/0332—Safety valves or pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/031—Air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0121—Propulsion of the fluid by gravity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0311—Air heating
    • F17C2227/0313—Air heating by forced circulation, e.g. using a fan
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/039—Localisation of heat exchange separate on the pipes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/06—Controlling or regulating of parameters as output values
    • F17C2250/0605—Parameters
    • F17C2250/0636—Flow or movement of content
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/2496—Self-proportioning or correlating systems
    • Y10T137/2559—Self-controlled branched flow systems
    • Y10T137/2562—Dividing and recombining
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/4238—With cleaner, lubrication added to fluid or liquid sealing at valve interface
    • Y10T137/4245—Cleaning or steam sterilizing
    • Y10T137/4273—Mechanical cleaning
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/6416—With heating or cooling of the system
    • Y10T137/6525—Air heated or cooled [fan, fins, or channels]

Definitions

  • LIQUID AIR BOILER 2 Sheets-Sheet 1 Filed July 27, 1945 Aug. 3, 1948.
  • G. T. UNDERWOOD LIQUID AIR BOILER 2 Sheets-Sheet 2 Filed July 27, 1945 i k I l l l l l L 1 l l I Q l l l I l f l Inventor 1 and p i e z' -W r n.tlikefnum ralsl iert 'i ei Patented Aug.
  • a further obj'ectpftheinverrti an to-provide an apparatus of this characterbTmeans ofiwhi'ch atmospheric' temperatures "is :ntiliz'ed "for? evapo ratirig th' liquid air and-oollecting-the resultant" air underpliessuretobe used for'operating varieous. types of -*powerplants:**
  • i 111ml wi e: a com a y .di w-vi jii nnms p 's'throueho tiar tiir i h Figure? l, is a sidejelevational'y ewiof' thepres ent liquid air noiletapparatus; withpartythereei of firokennway and showrrinsection;
  • FIG. 2 is-an,.enlarged sectional view of the" two-way control valve.
  • Figure 3 is a top.plan.vniew .g..
  • Figure 4 is a vertical sectional view taken substantiallyiion'aline 4+4 ofiFiguretl, and
  • Figure 5 is an enlarged sectional :aview of. the pressure operated.systemiortthetcontrolevalve.
  • the tank 5 is supported in an elevated position by means of suitable supports 8 and to the bottom of the tank is connected a pipe 9 in which a two-way valve I0 is positioned for controlling the flow of liquid air by gravity to a series of boiler tubes H in the form of a group of upright coils and through which the liquid air flows by gravity as indicated by the arrows in Figure 1, the valve l0 also regulates the flow of liquid through a feed pipe l2, leading directly to the bottom portion of a compressed air tank 13.
  • valve is shownin detail-inFiEur-e '2 ofthe drawings and is operable by the' lever 2
  • toreguelate the volume of liquid -air enteringj the-boner tubes ii and piped 2 i in' the' manner ads-indicated in accordan'ce with air pressure *in the boiler tubes' l- I i i Tliepiston i8 works against the tensionaof a coil-spring 23 mounted ona rod -2 4 onn'ected at f one'end to the outer end of th'lever i P and hav- - ing itsother end loosely 'positione'd in' the free endof an arm 25 which--is pivoted-as at zfi to'on end of: -tl1e tank 5.
  • Each tube l I is provided with a pair of scraping rings 28 secured in longitudinally spaced relation from each other by means of longitudinally extending connecting rods 30 so that the rings will slide as a unit on the tube.
  • the connecting rod 30 of adjacent coils project laterally toward each other in overlapping substantially closed spaced relation as indicated in Figure 4 of the drawings whereby frost collected on the rods 30 will be scraped by the overlapping connecting rods during the sliding movement of the rings on the tubes.
  • the groups of rings 28 for each of the coils are slidably actuated by means of longitudinally extending screws 3
  • the gears 35 for the screws of adjacent coils are arranged for operating the screws in opposite directions so that the rings 28 of adjacent coils will move in opposite directions during their scraping action to thus produce a scraping action between the overlapping connectors 30.
  • the motor 31 is reversed to cause a forward and backward sliding movement of the rings 28 by means of stationary contacts 38 connected to the motor and engaged by a movable contact 39 carried by one of the screws.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting'the reservoir to the tank, a coil connected at each end to the pipe, and exposed to atmospheric temperature to evaporate liquid air contained therein, a two-way valve regulating flow of liquid air through the pipe and coil, and a pressure operated piston in the coil for operating the valve.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting the reservoir to the tank, a coil connected at each end tothe pipe, and exposed to-atmospheric temperature to evaporate liquid air contained therein, a two-way valve regulating flow of liquid air through the pipe and coil, 2, pressure regulated piston in the coil, and an operating connection between the piston and the valve for operating the valve in accordance with the movement of the piston.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting the reservoir to the tank,
  • a coil connected at each end to the pipe, said coil being positioned in the path of air circulated at a temperature higher than that of the liquid air to evaporate the liquid air, a valve regulating flow of liquid air through the pipe and coil, and a scraper mounted for movement along the coil.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, and scrapers slidably mounted on said tubes.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, scraper rings slidably mounted on said tubes, connecting rods between the rings of each coil for uniform sliding movement, and gear drive means for moving the rings longitudinally of the tubes in opposite directions.
  • a liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, scraper rings slidably mounted on said tubes, connecting rods between the rings in longitudinally spaced groups for uniform movement and including longitudinally extending bars, the bars of adjacent coils being arranged in overlapping scraping relation, operating screws for the rings of each coil oppositely arranged gear means communicating with each of the screws, means for operating the rings of adjacent coils in opposite directions, andelectrical contact means for reversing the operation'of said screws upon completion of the travel of the rings in one direction.

Description

Au 3, 1948; G, D'E W D 2,446,498
LIQUID AIR BOILER 2 Sheets-Sheet 1 Filed July 27, 1945 Aug. 3, 1948. G. T. UNDERWOOD LIQUID AIR BOILER 2 Sheets-Sheet 2 Filed July 27, 1945 i k I l l l l l l L 1 l l I Q l l l I l f l Inventor 1 and p i e z' -W r n.tlikefnum ralsl iert 'i ei Patented Aug. 3, 1948 The present finventionrelates to: a new-and use ful impmvement=in -*liquid air boilers; and -moreparticularly to 'a device of thi s -c' -haracter adapted forgeneratin'g compresseel airfor'use as'-'a sourceof powerfor various purposeswsunlras refrigera tio'nplant -'-or =-ioi- 'operating'-- rectory-mining rnagchinery-g or for othersusefu-lpurpose A further obj'ectpftheinverrti an to-provide an apparatus of this characterbTmeans ofiwhi'ch atmospheric' temperatures "is :ntiliz'ed "for? evapo ratirig th' liquid air and-oollecting-the resultant" air underpliessuretobe used for'operating varieous. types of -*powerplants:**
A iurther'pbj'ect of theiinventiion'is to provide an apparatuslof thischaracterof simpleandprac' ticalaconstructionywhich iseffici'e'nt'andreliable? in operati'on," inexpensive to"manufa'cturel and in; stall in assembled relati'on andwhiclrjsother Wis'e'welladaptedfor the purposes 'for'iwhi'chthe sameisintended.
Other'objects andadvantagesreside'in thE'dd-f' tails of onstruction' and operation asjmoreiully hereinafter described and idlainiedgief erencer be;
i 111ml: wi e: a com a y .di w-vi jii nnms p 's'throueho tiar tiir i h Figure? l, is a sidejelevational'y ewiof' thepres ent liquid air noiletapparatus; withpartythereei of firokennway and showrrinsection;
Figure. 2 .is-an,.enlarged sectional view of the" two-way control valve.
Figure 3 is a top.plan.vniew .g..
Figure 4 is a vertical sectional view taken substantiallyiion'aline 4+4 ofiFiguretl, and
Figure 5 is an enlarged sectional :aview of. the pressure operated.systemiortthetcontrolevalve.
Referring'now to the drawings indetail wherein for thepurpose of illustratioml have disclosed may be supplied to the tank' and the tank is also provided withaa saiet-y -valve 1 of -conventional construction.
The tank 5 is supported in an elevated position by means of suitable supports 8 and to the bottom of the tank is connected a pipe 9 in which a two-way valve I0 is positioned for controlling the flow of liquid air by gravity to a series of boiler tubes H in the form of a group of upright coils and through which the liquid air flows by gravity as indicated by the arrows in Figure 1, the valve l0 also regulates the flow of liquid through a feed pipe l2, leading directly to the bottom portion of a compressed air tank 13. The pipe I2 and. tank lected: in thetan'k; A supply 1 piped leads from :1
2 iii 5 are coveredtwitnt' a. suitableheatinsnlatioznmaeaterialzl 4; v
The iboiler :tubes:or:1coils l I? are 6Xp0SBd=-t0fiat mospherictemperature: andairzzislolowmoversth coils by: means LOf' an electric famlfitrnountedcin an elevated position abovez thezcotlsfian one 'endwi thereof :by meansiof a bracketfiztfi fsecuredetoione end of the tank 5.
As the liquid lair passes 'througlr rthewboilei' -w' tubes or'coils l l; and: issubiectedato atmospheric temperature; the liq'uid 3 air will evaporatei toithus increase "the air pressure. The-lower endiot the coils i are connected to the pipe kl adiacent the tank 5 3 so that-the compressed air is ted =and'coithe tank 13 for utilizingthe compressect ainlfon any useful =purpose suoh as operatin oa pressed air engine or for-'other'work.
The flow of liquidair entering the "boilertimesor coils H and the pipe I2 is contrOlled bfi-air pressurein the coilsthrough-the medium 'of a piston i8 mounted in a cylinder l9 connected to'one" of the lower tubes ii; the piston having a piston" rod -2 il projecting outwardly v or the cylinder and connected =to =a lever 2li for operatingthe-valve l0 by-a link 22.
The valveis shownin detail-inFiEur-e '2 ofthe drawings and is operable by the' lever 2| toreguelate the volume of liquid -air enteringj the-boner tubes ii and piped 2 i in' the' manner ads-indicated in accordan'ce with air pressure *in the boiler tubes' l- I i i Tliepiston i8 works against the tensionaof a coil-spring 23 mounted ona rod -2 4 onn'ected at f one'end to the outer end of th'lever i P and hav-=- ing itsother end loosely 'positione'd in' the free endof an arm 25 which--is pivoted-as at zfi to'on end of: -tl1e tank 5. I The arm= 2 fi 'is seoured in pivotally adjusted position :by mea-ns of a screw 2'! and by means of- -vvhich {the -tensionaof- =the spring 23 is regulated;
More or-lessmoisture in the-atmosphere causes frost to accumulate *on -=the b oiler tubes tor coi-ls H and in order to prevent the accumulation of frost on these tubes, I provide each of the tubes with a plurality of scraper rings 28 slidably mounted on the tubes, the rings on the vertically spaced tubes of each coil being connected for uniform sliding movement by rod 29.
Each tube l I is provided with a pair of scraping rings 28 secured in longitudinally spaced relation from each other by means of longitudinally extending connecting rods 30 so that the rings will slide as a unit on the tube. The connecting rod 30 of adjacent coils project laterally toward each other in overlapping substantially closed spaced relation as indicated in Figure 4 of the drawings whereby frost collected on the rods 30 will be scraped by the overlapping connecting rods during the sliding movement of the rings on the tubes. The groups of rings 28 for each of the coils are slidably actuated by means of longitudinally extending screws 3| threaded through arms 32 projecting from the vertical rods 2}), the screws being journaled in brackets 33 at the ends of the coils and have bevelled gears 34 secured at one end thereof operatively engaged with similar gears 35 secured on a transversely extending shaft 36 operated by an electric motor 37.
The gears 35 for the screws of adjacent coils are arranged for operating the screws in opposite directions so that the rings 28 of adjacent coils will move in opposite directions during their scraping action to thus produce a scraping action between the overlapping connectors 30.
The motor 31 is reversed to cause a forward and backward sliding movement of the rings 28 by means of stationary contacts 38 connected to the motor and engaged by a movable contact 39 carried by one of the screws.
In view of the foregoing description taken in conjunction with the accompanying drawings it is believed that a clear understanding of the construction, operation and advantages of the device will be quite apparent to those skilled in the art. A more detailed description is accordingly deemed unnecessary.
It is to be understood, however, that even though there is herein shown and described a preferred embodiment of the invention the same is susceptible to certain changes fully comprehended by the spirit of the invention as herein described and the scope of the appended claims.
I claim:
1. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting'the reservoir to the tank, a coil connected at each end to the pipe, and exposed to atmospheric temperature to evaporate liquid air contained therein, a two-way valve regulating flow of liquid air through the pipe and coil, and a pressure operated piston in the coil for operating the valve.
2. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting the reservoir to the tank, a coil connected at each end tothe pipe, and exposed to-atmospheric temperature to evaporate liquid air contained therein, a two-way valve regulating flow of liquid air through the pipe and coil, 2, pressure regulated piston in the coil, and an operating connection between the piston and the valve for operating the valve in accordance with the movement of the piston.
3. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, a pipe connecting the reservoir to the tank,
4 a coil connected at each end to the pipe, said coil being positioned in the path of air circulated at a temperature higher than that of the liquid air to evaporate the liquid air, a valve regulating flow of liquid air through the pipe and coil, and a scraper mounted for movement along the coil.
4. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, and scrapers slidably mounted on said tubes.
5. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, scraper rings slidably mounted on said tubes, connecting rods between the rings of each coil for uniform sliding movement, and gear drive means for moving the rings longitudinally of the tubes in opposite directions.
6. A liquid air boiler comprising a reservoir adapted to contain liquid air, a compressed air tank, an insulated pipe connecting the reservoir to the tank, an evaporator connected adjacent the ends of the pipe, valve means in the pipe controlling the flow of liquid air through the pipe and into the evaporator, said evaporator including a plurality of coils having spaced parallel tubes, scraper rings slidably mounted on said tubes, connecting rods between the rings in longitudinally spaced groups for uniform movement and including longitudinally extending bars, the bars of adjacent coils being arranged in overlapping scraping relation, operating screws for the rings of each coil oppositely arranged gear means communicating with each of the screws, means for operating the rings of adjacent coils in opposite directions, andelectrical contact means for reversing the operation'of said screws upon completion of the travel of the rings in one direction.
GEORGE I. UNDERWOOD.
' file of this patent:
UNITED STATES PATENTS Number 7 Name Date 2,351,131 Kerr June 13, 1944 FOREIGN PATENTS Number Country Date 385,833 Great Britain Jan. 5, 1933
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2729074A (en) * 1950-04-24 1956-01-03 British Oxygen Co Ltd Vaporisation of liquefied gases
US2996897A (en) * 1961-08-22 Atmospheric water supply apparatus
US3124940A (en) * 1960-10-12 1964-03-17 Guelton
US3847174A (en) * 1973-02-28 1974-11-12 F Doyle Radiant heat absorber
US4438729A (en) * 1980-03-31 1984-03-27 Halliburton Company Flameless nitrogen skid unit
US4458633A (en) * 1981-05-18 1984-07-10 Halliburton Company Flameless nitrogen skid unit
US5983922A (en) * 1995-06-26 1999-11-16 Laing; Karsten A. Instantaneous hot-water delivery system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB385833A (en) * 1932-05-06 1933-01-05 Johannes Paasche Improvements in refrigerant evaporators for air-cooling apparatus combined with refrigerating chambers
US2351131A (en) * 1940-11-28 1944-06-13 Phillips Petroleum Co System for storage and utilization of fuel gases

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB385833A (en) * 1932-05-06 1933-01-05 Johannes Paasche Improvements in refrigerant evaporators for air-cooling apparatus combined with refrigerating chambers
US2351131A (en) * 1940-11-28 1944-06-13 Phillips Petroleum Co System for storage and utilization of fuel gases

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2996897A (en) * 1961-08-22 Atmospheric water supply apparatus
US2729074A (en) * 1950-04-24 1956-01-03 British Oxygen Co Ltd Vaporisation of liquefied gases
US3124940A (en) * 1960-10-12 1964-03-17 Guelton
DE1176162B (en) * 1960-10-12 1964-08-20 Air Liquide Evaporator for liquid gas with iron removal device
US3847174A (en) * 1973-02-28 1974-11-12 F Doyle Radiant heat absorber
US4438729A (en) * 1980-03-31 1984-03-27 Halliburton Company Flameless nitrogen skid unit
US5551242A (en) * 1980-03-31 1996-09-03 Halliburton Company Flameless nitrogen skid unit
US4458633A (en) * 1981-05-18 1984-07-10 Halliburton Company Flameless nitrogen skid unit
US5983922A (en) * 1995-06-26 1999-11-16 Laing; Karsten A. Instantaneous hot-water delivery system

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