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Publication numberUS3906743 A
Publication typeGrant
Publication dateSep 23, 1975
Filing dateMay 30, 1973
Priority dateMay 30, 1973
Also published asCA1031589A1, DE2421667A1, DE2421667C2
Publication numberUS 3906743 A, US 3906743A, US-A-3906743, US3906743 A, US3906743A
InventorsBarash David, Graul William E, Schorsch John B
Original AssigneeUnion Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Refrigeration apparatus having a rotatable drum
US 3906743 A
Abstract
Material is fed into a revolving drum which has an interior configuration, preferably in the form of a helical blade, to convey the material at a controlled rate through the drum. A low temperature gas, such as nitrogen, is introduced into the drum downstream when viewed in the direction of travel of the material, in a liquid state at a controlled rate through a spray nozzle system, thereby continuously exposing the material to the cooling effect of the gas. A portion of the gas is recirculated from the upstream end to the downstream end of the drum. The material is pre-cooled in the upstream portion of the drum. After exiting from the drum, the material may be crushed or impacted and separated.
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Description  (OCR text may contain errors)

United States Patent Schorsch et al.

[ 51 Sept. 23, 1975 154] REFRIGERATION APPARATUS HAVING A ROTATABLE DRUM [75] Inventors: John B. Schorsch, Rydal; William E.

Graul, Drexel Hill, both of Pa; David Barash, Ridgefield, Conn.

[73] Assignee: The Union Corporation, Verona, Pa.

[22] Filed: May 30, 1973 [211 Appl. No: 365,117

[52] US. Cl 62/374; 62/381 [51] Int. Cl. t l F25D 17/02 [58] Field of Search 62/63, 381, 374

[56] References Cited UNITED STATES PATENTS 2.609.150 9/1952 Bludeau 4. 62/381 X 2.879.005 3/1959 .larvis..... 62/374 X 3.015.219 l/1962 Veyrie 62/63 X 3,091.099 5/1963 Sharp 62/63 X 3.213,634 10/1965 Granata 62/381 X 3.395.549 8/1968 Grimes. 62/381 X 3,446,030 5/1969 Rubin 62/63 Primary blvuminer-Carroll B. Dority, Jr. Aszs'z'stam E.\'unzinerRonald C. Capossela Attorney, Agent, or Firm-Bowie, Benasutti and Preston [57 ABSTRACT Material is fed into a revolving drum which has an interior configuration, preferably in the form of a helical blade, to convey the material at a controlled rate through the drum. A low temperature gas, such as nitrogen, is introduced into the drum downstream when viewed in the direction of travel of the material, in a liquid state at a controlled rate through a spray nozzle system, thereby continuously exposing the material to the cooling effect of the gas. A portion of the gas is recirculated from the upstream end to the downstream end of the drum. The material is pre-cooled in the upstream portion of the drum. After exiting from the drum, the material may be crushed or impacted and separated.

21 Claims, 7 Drawing Figures US Patent Sep't. 23,1975 Sheet 1 of 3 3,906,743

LIQUID NlTROGEN US Patent Sept. 23,1975 Sheet 2 Of3 3,906,743

US Patent Sept. 23,1975 Sheet 3 of3 3,906,743

IFII'ILIIIII 1 REFRIGERATION APPARATUS HAVING A ROTATABLE DRUM BACKGROUND OF THE INVENTlON" This invention relates generally tolcontinuous cryogenic treatment of materials. More particularly, the invention relates to an apparatus and process forconti-nuously feeding material; such as scrap, thourgh a freezing zone to render it brittle so that,' thereafter. it can be crushed or impacted and separated according to the various types of material of which is it composed.

': In the prior art, it is known to subject material, such as insulated wire, to a low temperaturegassueh as nitrogen, in a liquid atomizedstate, so that the insulation becomes brittle andcan. be cracked off of the metallic wire, thereby separating the wire. from the insulation. See, for example, US. Pat. No. 3,647,149. One disadvantage of the prior art. devices, such asthat shown in referenced patent, wherein a conveyor belt is used in the freezing zone, is that it is difficult to lubricate the moving parts -of the apparatus within the extremely cold environment. Also, there can. be afrost' build-up within the device and the accumulation offine particles or-other undesirable material.

Other problems that have arisen in prior art devices involve the distribution and agitation .of the gas within the freezing chamber and, imparticular, involve attempts to get maximum exposure of the product to the cooled gas and maximum utilization of the cooling cffeet of the gas.

SUMMARY OF THE INVENTION .transport means, most preferably helices attachedto the inner surface ofthe drum for moving thematerial from an input end through a precooling zone and downstream freezing zone and then discharging it. The rate of feed is adjustably controlled by regulating the speed at which the drum rotates. In connection with this apparatus, we have provided a cold g as circulating system having a plurality of nozzles for introducing liquified refrigerant gas into the interior .of the drum at spaced intervals. The nozzles are supported in unique manner. Some of the used nitrogen gas is drawn off at the upstream end of the drum and reintroduced at the downstream end of the drum. Part of the used gas that has lost its effectiveness is continuously exhausted.

Various other inventive structural and processfeay tures will become apparent from the following description with reference to the accompanying drawings The primary object of this inventionis to providean improvcd apparatus and method for cryogenic processing of material. This other objects of the. invention will also become apparent from the following description. v

BRIEF DESCRIPTION OF THE'DRAWINGS FIG. 1 is a side view of an apparatus in accordance with our invention partially broken away and shown in section with alternate positions shownin pha nto rn lines and certain portions shown schematically; a FIG. 2 is an enlarged section taken as indicated by the lines and arrows 2- 2 iniFIC l has been foreshortenedand partially broken away; i 4

FIG. 3 is a greatly enlarged section talse njas indicated by the lines and arrows 3-3 in FIG. 2; I

. 2' FIG. 4 is an enlarged end view taken as indicated by the lines and arrows 4 in FIG. 1 I

FIG. 5 is a foreshortend side view of an alternate embodiment of our invention showing the preferred embodiments of certain portions of the invention; FIG. 6 is a section taken as indicated by the lincsa nd arrows 66 in FIG. 5, with portionsof the apparatus shown in phantom lines; and i I I i i 7 FIG. 7 is an enlarged section ,of a portion of the device shown in FIG. I. i I I DESCRIPTION OF THE PREFERRED EMBODIMENT I Although specific forms of the invention have been selected for illustration in the drawings, and the following description is drawn in specific terms for'the purpose of describing these forms of the invention, this'description is not intended to limit the scope of the invention which is defined in the appended claims FIG. 1 a drum, designated generally 10, comprises a cylindrical shell 12 made ofa suitable material for withstanding extremely cold temperatures, such as 394 stainless steel or other similar cryogenic material. The interior of the drum in accordance withour invention is provided with a means for transporting material through the, drum upon rotation of the drum. In the preferred embodimentshownQthe interior configuration of the ,drum comprises a flat spiral bladc l'4'disposed in a heli x welded along the inner surfacc'bf the drum. The blade extends radially inwardly from the wall of the drum ajdistancc ofa pp'roxi rnately on'c jtcnt'h of the diamter of the drurr'i.

The drum issupported'for rotation on a plurality of rings 18 which provide a forcetransmitting, insulating means. The rings are of a unique construction in that they comprise two T-shapcd members insulated from one another by a spacer madc of plastic or other suitable insulating and force-transmitting materiall A cross-section of a typical ring is shown in FIG. 3.The

outer T- s haped portion is a metallic ring while the inner T -shaped portion is made up of a plurality of L- shaped pieces 22'a'nd 24 formed into an annular ring.

The sternsiof the T-shapcd portions are opposed and are joined by four brackets 26 L-shaped' in crosssection and'a plastic spacer 3 0. Referring'to FIGS. 2 and 3, each of the brackets 26 are wclded to their respective stems of the T-shaped portions. Bolts 28 firmly clampthc plastic spacer 30 between the brackets 26.

The outside of the cylinder is covered with an insulating material 16, which extends outwardly from the shell 12 past the inner frce'end of the stem 20 and engaging and covering the inner portion of the rings, but not beyond the outer face of the ring 20. Thus, the insulation ring 2 0, so that the ring tracks in and rolls on the roller 40. Thc rollers 40 driven by means of sprockets 44 mounted on common shafts with the rollers and interconnected by means of a chain 46. The sprocket 47 is mounted on a shaft 48 driven by a pulley belt drive means, designated generally 49, corinected to a source of motive power 50, FIG. 1. This electric motor 50 is a variable speed motor, so that the speed at which the drum l0 rotateson the driven rollers 40 can be adjuste d. Adjusting the speed of' ro tation' adjusts the travel of material through the drum and thus regulates the exposure of the material to cold gas. Alternate means could be provided within the scope of this invention for rotating the drum on the rings, such as hydraulic motors directly driving the rollers 40.

Material enters the drum by means of the input chute 60. This chute passes through a box-like entrance header, designated generally 62, at the upstream end, designated generally 64, of the drum 10. The upstream end 64 of the drum has an annular face plate 66 fixedly mounted thereto. Overlapping the shell 12 is a cylindrical reinforcing shell 68 retained by an annular flange 70. Additional insulation is provided at 71. The walls of the header 62 are insulated as shown at 72. Between the insulation 71 and the insulation on the outer wall of the header 62, there is a heat tape 65. This tape can be heated by electricity remotely controlled to prevent frost build-up in the space shown and thereby prevent wearing of the insulation. At the point at which the chute enters the header 62 there is a free swinging plate 74 forming a door which automatically opens and closes as shown by the phantom and full line positions respectively in FIG. 1, when material comes down the chute and enters the header on its way toward the drum 10. An additional free swinging door is provided by the insulated plate 76 mounted in the transverse partition 78 which completely divides the box-like header into two compartments. These doors serve a useful function in connection with certain exhaust fans which will now be more fully described.

A stack 80 is provided communicating through the top of the header 62 with the upstream compartment 82. Within the stack 80 there is mounted a discharge fan 84 driven by any suitable motive means 85. The purpose of this discharge fan is to draw off air coming in with the material down the chute and also to draw off used nitrogen gas which may escape when the door 76 is opened. A control damper 87 is provided on the discharge side of the fan 84.

In the preferred construction shown in FIG. 5, the chute 60 is replaced by an alternate forced feeding means, such as a mechanical feeder 160, which reciprocates as shown by the arrows. The feeder is shown basically in a schematic form comprising a trough 162 mounted on arms 164 and driven in a reciprocating motion by means of a motor and crank arm, designated generally 166. This loosely shakes the incoming material into the rotating drum. The mechanism is not described in further detail herein since such feeders are known in the art. Indeed, a vibrating feeder could also be used as an alternate feeding means. It should be noted that the stack will continue to have a fan and a control damper for the same purposes as previously de scribed.

While many kinds of materials can be processed by our apparatus. this invention has particular applicability to scrap metal which is composed of various components of material. such as ferrous and nonferrous metals which cannot be cleanly separated by mechanical means. By freezing the scrap material. it is possible to shatter it in a crusher or imp-actor and then separate out particular materials magnetically. or by other suitable means. In FIG. 1 we have shown schematically a crusher 92 and a magnetic conveyor-separator 94. These devices are not shown in greater detail. since they are well known in the art.

The first stage in the separation process is the freezing unit, and in accordance with out invention, we provide a pre-cooling chamber and a cooling chamber within our freezing unit 10. Liquid nitrogen is introduced into the freezing portion of the chamber (which is downstream when viewed in the direction of travel of the material through the chamber), through a common header and a plurality of nozzles 102. As the nozzles spray the nitrogen into the chamber, it immediately vaporizes to low temperature gas and comes into intimate contact with the moving scrap material. As the drum rotates, the helical blade transports or advances the material down the drum. The inner surface of the shell 12 is continually moving with respect to the material, so that this surface is re-exposedto the cold gas intermittently and then comes in contact with the under surfaces of the material. This also has the effect of wiping the surface of the drum, thereby removing frost. This contact may be enhanced where flights or vanes are used, rather than a helix, by virtue of the churning action caused by the tumbling of the material as it proceeds down the inner surface of the drum. However, in this embodiment the helical blade 14 is preferable. since the continuity of the blade presents a configura' tion which is not susceptible to having irregular pieces of material hang-up on it. The header 100 is supported on a cable 104, which is fixedly connected at one end to and within the header 62 and is fixedly connected at the other end to any convenient structure, such as at 106. A tension device 108 is provided to adjust the tension in the cable depending on the weight of the header 100. A plurality of rings 110 are connected to the header and disposed about the cable to support the header on the cable.

The liquid nitrogen, as it enters the chamber, is at a temperature of approximately -320F. In order to maximize the effectiveness of the nitrogen contact with the material, a flow is provided by withdrawing some of the nitrogen gas from the upstream end of the drum and pumping it back through a conduit 112 and a nozzle 114 into the downstream end of the drum 10. The nitrogen gas is heavier than air and for the most part lays in the bottom of the drum, which is mounted horizontally. The internal transport means tend to make the gas flow out the discharge end. The reverse flow condition tends to inhibit this loss. It is difficult to maintain a closed fluid flow system with so many openings at the entrance and discharge and, therefore, it is necessary to pump gas in at the discharge end to maintain the flow. When the door 76 is closed, the compartment 84 essentially communicates only through the port 86in the end plate 66 within the cavity 89 formed within the shell 12. Used nitrogen gas is drawn out through this port 86 and down through the conduit 88 by means of the recirculating fan 90 which runs constantly as the device is operating. 1n the processing of scrap iron, for example, this recirculation of gas is at a temperature of about l50F once the unit reaches its continuous operating condition.

In the preferred embodiment shown in FIGS. 5 and 6, the nozzle 114 is replaced by an ejector 214 mounted on the discharge end of the conduit 112. The intake end of the injector is provided with a control damper 216. In this embodiment, the discharge header 218 embraces the discharge end of the rotating drum 10 to form a chamber for mounting the ejector 214, as clearly illustrated in the figures. The bottom of the header 218 has a plurality of trap doors 220 which are rotatably mounted to swing between the closed position shown in full lines and the open position shown in phantom line'srThe doors are spring biased or counter weight ed by ansuitable means (not shown) to return to their closed position when not acted upon by material being discharged from the drum 10. Protective means in the form'of angle irons and the like (as shown at 400; 401) are provided mounted above the hinges to prevent jamming of the hinge by material exiting from the unit. The doors open into achute 222, which has a second pair of similarly mounted doors 224, which function in a similar fashion as shown by the solid and phantom lines. The chute 222 opens into the crusher 92.

I The ejector improves the operation of the-system by recirculating a portion of the nitrogen WhlCh WOUld otherwise be discharged. This portion of the nitogen is drawn into the ejector from the discharge header 218 as shown by the arrows in FIG. 6'and isinduced to flow from the discharge end of the drum toward the intake or upstream end of the drum.

The flow pattern provided by the recirculating system provides a pre-cooling chamber in the upstream portion of the drum 10 between the port 86 and that nozzle which is positioned at the upstream end of the header 100. In this pro-cooling chamber, the nitrogen gas which has lost muchof its cooling power by virtue of contact with the material inthe drum in the downstream freezing portion thereof, is exposed to the incoming material to reduce its temperature before it enters the freezing chamber, thereby increasing the effectiveness of the system in the freezing portion of the drum.

Since more nitrogen is constantly being introduced through the nozzles 102, there is a build-up ofnitrogen gas such that the excess must, at times, be withdrawn. This is done in the recirculation cycle by means of the discharge conduit 116 connected to a valve mechanism (shown schematically at 117) which can be operated in response to an automatic flow indicator 118.

The input of nitrogen, the withdrawal of used nitrogen, and the speed of the rotation of the drum are all regulated in accordance with the actual effect on the particular items of material being processed. Thus, these can and must be adjusted depending onthe thickness of the material and other factors which may be encountered in dealing with the particular material. In the case of scrap, the end result is to render some of the scrap components brittle and fragile by subjecting it to the low temperature refrigerant gas while conveying it in the rotating drum, so that by the time the scrap is discharged through the insulated free swinging door 119 down the chute 120, FIG. 1, into the crusher 92, -it is ready for fragmentation by impaction or crushing. To this end, thermocouples are provided as at 300, 301, 302, 303, 304 and 305 to monitor temperature and for use in adjusting the controls.

It will be observed from what has been described that in operation this device automatically takes care of frost build-up with in the drum by virtueof the wiping action of the material on the walls of the drum. The ice which is removed is then transported out of the drum with the material. This wiping actionalso prevents particle build-up. Furthermore, since there is no mechanism having moving parts within the freezing zone, there can beno freeze-up of the material, transporting means.

It will also be observed that by re-introducing a portion of the nitrogen gas at the downstream endvof the drum, there is a thorough mixing and intimate contact between the refrigerant gas and the material. This contact is enhanced by the constant motion of the material within thedrum.

It will be understood that various changes in the details, materials and arrangement of parts which have been herein described and illustrated in order to explain the nature of this invention may be made by those skilled in the art within the principle and scope of the invention as expressed in the following claims. For example, the same process and apparatuscan be employed for cooling other materials, such as scrap rubber, food products, plastics, organic material, metallics,

and the like, I

It will further be understood that the Abstract of the Disclosure set forthabove is intended to provide a nonlegal technical statement of the contents of the disclosure in compliance with the Rules of Practice of the United States Patent Office, .arid is not intended to limit the scope of the invention described and claimed herein.

What is claimed is:

'1 A refrigerating means, comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which further comprises transport means for advancing the material longitudinally within said drum upon rotation of the drum; and

I wherein the drum is provided with exterior insulation and is supported for rotation on aplurality of rings, said rings have, as part thereof, insulated forced-transmitting members;

b. rotation means engaging said drum for rotating said drum; and

c. refrigeration means within said drum to refrigerate said material while it is within said drum.

2. A refrigerating means, comprising:

a. a'rotatable drum having means to receive and to discharge material; said drum having an interior configuration which further comprises transport means for advancing the material longitudinally within said drum uponrotation of the drumqand wherein the drum is provided with exterior insulation and is supported for rotation on a plurality of rings, said rings have, as part thereof, insulated forced-transmitting members, and wherein each of said rings comprise a firstfiportion attached to the exterior of said drum, a second portion engaging said rotation means and means engaging said insulating and force-transmitting member and retaining said first portion to said second portion with said member therebetween, refrigeration means within said drum. to refrigerate said material while it is within said-drum.

'3. The invention of claim 2, wherein said rotation means comprises a plurality of motor driven rollers engaging said rings.

4. The invention of claim 3 wherein said motor is variable speed to thereby control the speed of rotation of saiddrum and the speed of advancement of material through said drum.

5. A refrigerating means, comprising:

a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum upon rotation of said drum;

b. rotation means engaging said drum for rotating said drum; and refrigeration means within said drum to refrigerate said material while it is being transported through said drum, wherein said refrigeration means further comprises nozzle means within the drum for introducing refrigerant within said drum, and wherein said refrigeration means further comprises a low temperature fluid introduced through spray nozzles disposed within said drum. and wherein said nozzles are mounted to a header and said header is supported within and spaced from the interior of said drum on a cable passing through said drum.

6. A refrigerating means. comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum upon rotation of said drum;

b. rotation means engaging said drum for rotating said drum; and

c. refrigeration means within said drum to refrigerate said material while it is being transported through said drum. wherein said refrigeration means further comprises nozzle means within the drum for introducing refrigerant within said drum, and wherein said refrigeration means further comprises a low temperature fluid introduced through spray nozzles disposed within said drum.

and wherein said fluid is a liquid which becomes a gas in the environment within said drum; and wherein said refrigerating means further comprises recirculation means for recirculating said gas from the end of said drum which receives said material externally to and through the end of said drum from which material is discharged.

7. The invention of claim 6, wherein said gas is introduced in and through said discharge end by a nozzle.

8. The invention of claim 6 wherein said gas is introduced in and through said discharge end by an ejector means.

9. A refrigerating means. comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum upon rotation of said drum;

b rotation means engaging said drum for rotating said drum; and

. refrigeration means within said drum to refrigerate said material while it is being transported through said drum, wherein said refrigeration means further comprises nozzle means within the drum for introducing refrigerant within said drum. and wherein said refrigeration means further comprises a low temperature fluid introduced through spray nozzles disposed within said drum. and wherein said gas is introduced in and through said discharge and by an ejector means.

and wherein a discharge chamber is provided within a discharge header juxtaposed to the discharge end of said drum; and said ejector means is mounted within said chamber to draw gas therefrom and recirculate it with the gas from the other end of said drum.

10. The invention of claim 9 wherein said ejector means has a damper control in its intake from said header.

11. The invention of claim 9 wherein said discharge 5 header has at least one door to permit discharge of material from said header; said door being rotatably mounted to said header by a hinge means; and protective means are mounted in said header to prevent jamming of said hinge by said material.

12. The invention of claim 9 wherein said discharge header comprises a structure providing an insulated chamber communicating with the interior of the drum and having at least one door biased normally closed to automatically open to allow discharge of material from. said chamber; said structure providing a second charrber for receiving material discharged from said first chamber; said second chamber having an exit door biased normally closed to automatically open to allow material to exit therefrom.

13. A refrigerating means, comprising:

a. a rotatable drum having means to receive and t: discharge material; said drum having an interio: configuration which will transport the material re ccived through said drum;

b. rotation means engaging said drum for rotating said drum;

e. refrigeration means within said drum to refrigerate said material while it is being transported through said drum; and

d. an improved feeder means for introducing material into said drum; said feeder means comprising an intake headerjuxtaposed to the material receiving end of said drum so that said drum is free to rotate with respect thereto; said intake header forming a chamber communicating with the interior of said drum; said header having a means passing therethrough for introducing material through said chamber into said drum. said last mentioned mean. comprising a chute; and said header being divided into a plurality of chambers separated from one another by a partition having an opening therein; am; said chute passing through said opening; said opening having a door biased normally closed for auto matically allowing material to pass through saic partition and for automatically closing once mate rial has passed thercthrough.

14. The invention of claim 13 wherein said header has a second door disposed in an opening in the wall of said header. and said chute passes through said opening; said second door automatically allowing material to pass thercthrough and automatically closing after material has passed therethrough; and a stack means is provided for withdrawing air and gas from said chambers.

15. The invention of claim 14 wherein said stack means comprises a stack communicating with the chamber having said second door opening therein; said stack having mounted therein a fan to withdraw air and gas from said chambers.

16. A refrigerating means, comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum:

b. rotation means engaging said drum for rotating said drum;

c. an improved feeder means for introducing material into said drum; said feeder means comprising an intake header juxtaposed to the material receiving end of said drum so that said drum is free to rotate with respect thereto; said intake header forming a through said drum; said gas recirculation means further comprising a conduit communicating with said chamber; a recirculating fan communicating with said conduit; a conduit communicating the discharge end of said recirculating fan with the dischamber communicating with the interior of said drum; said header having a means passing therethrough for introducing material through said chamber into said drum, said last mentioned means comprising a chute; and said header being divided 10 into a plurality of chambers separated from one another by a partition having an opening therein; and said chute passing through said opening; said opening having a door biased normally closed for automatically allowing material to pass through said partition and for automatically closing once material has passed therethrough; and

d. refrigeration means within said drum to refrigerate charge end of said drum; and an excess gas discharge means communicating with said last mentioned conduit.

18. The invention of claim 17 wherein said excess gas discharge means comprises a valve controlled discharge pipe and a means for monitoring the flow of gas through said conduit to said discharge end of said drum.

19. A refrigerating means, comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum upon rotation of said said material while it is being transported through drum. said drum; Said refrigerating means further 20 b. rotation means engaging said drum for rotating prising a low temperature gas; and gas recirculation said drum.

means being provided communicating with the chamber within said header for withdrawing gas from said header and said drum and rcirculating it externally to and through the discharge of said 2 drum, thereby creating a gas flow within said drum counter to the direction of travel of the material through said drum.

17. A refrigerating means, comprising:

a. a rotatable drum having means to receive and to discharge material; said drum having an interior configuration which will transport the material received through said drum;

b. rotation means engaging said drum for rotating said drum;

c. an improved feeder means for introducing material into said drum; said feeder means comprising an intake header juxtaposed to the material receiving c; refrigeration means within said drum to refrigerate said material while it is being transported through said drum and d. an improved feeder means for introducing material into said drum, comprising: an intake header juxtaposed to the material receiving end of said drum so that said drum is free to rotate with respect thereto. said intake header forming a chamber communicating with the interior of said drum; said header having a means passing therethrough for introducing material through said chamber into said drum; and wherein heating means are provided between said header and said drum to prevent frost buildup therebetween.

20. The invention of claim 19 wherein insulation is provided on said drum proximate to said header and said heating means.

end of said drum so that said drum is free to rotate 21. A refrigerating means. comprising:

with respect thereto; said intake header forming a chamber Communicating with the interior of Said a. rotatable drum having means to receive and to drum; Said header having a means passing thcre dlscharge material; sa d drum having an interior through for introducing material through Said configuration which will transport the material rechamber into said drum, said last mentioned means Ccwecl through Said dnfmi comprising a chute; and said header being divided @tatlon means cngagmg 51nd drum for rotating into a plurality of chambers separated from one andrum; other by a partition having an Opening thgrcin; and c. an improved feeder means for introducing material said chute passing through said opening; said openinto Said drum? Said fccder mums Comprising an ing having a door biased normally Closed f 21mm intake header juxtaposed to the material receiving i ll ll i i l to pass h h id end of said drum so that said drum is free to rotate partition and for automatically closing once matewith respect hereto; Said intake header forming u i l h passed h h h; d chamber communicating with the interior of said d. refrigeration means within said drum to refrigerate drum? Said hcadcr having a means Passing there said material while it is being transported through r gh for n ng material through said said drum; said refrigerating means further com- 55 chamber into said drum; said feeder means further prising a low temperature gas; and gas recirculation comprising a controlled mechanical feeder; and means being provided communicating with the d. refrigeration means within said drum to refrigerate chamber within said header for withdrawing gas said material while it is being transported through from said header and said drum and recirculating said drum; sensing means being provided within the it externally to and through the discharge of said 0 refrigerating means to control the rotation of said drum, thereby creating a gas flow within said drum counter to the direction of travel of the material drum and the feeder means.

i l i

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3992899 *May 1, 1975Nov 23, 1976Messer Griesheim GmbhDevice for cooling bulk material by low-boiling liquefied gas
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Classifications
U.S. Classification62/374, 62/381
International ClassificationF25D25/04, C02F11/20, C02F11/18, B02C19/00, F28D11/00, F28D11/02, B02C19/18, F25D3/11, F25D3/10, F25D25/00
Cooperative ClassificationB02C19/186, F25D3/11, F25D25/04
European ClassificationB02C19/18C, F25D25/04, F25D3/11