US2401797A - Heat exchanger - Google Patents

Description

June 11, 1946. o. RASMUSSEN HEAT EXCHANGER Filed Dec. 27, 1943 INVENTOR 04 "IF Qflsmussf/v B J *2 M5 m 0 ATTORNEYS Patented June ll, 194$ 1 HEAT EXCHANGER Olaf Rasmussen, Dayton, Ohio, assignor to General Motors Corporation, Detroit, Mich., a corporation of Delaware Application December 27, 1943, Serial No. 515,734

1 Claim. (Cl. 210150.5)

This invention relates to heat transfer apparatus and is particularly concerned with a combination heat transfer device and filter.

An object of the invention is to provide a heat transfer device in combination with a filter 5 24 and 26 are spaced by means of two side porwherein, due to the peculiar nature of the filtertions or rails 28 and 30 which assembly forms a ing medium, the effective area of the heat transframe open at both sides thereof. fer surface is greatly increased. The frame, formed by the two side rails 28 and Another object of the invention is to provide 30 of the headers 24 and 26, together with the an oil cooler and filter wherein water or other in attached tubes is then preferably placed on a cooling medium may be circulated through a graphite plate and metal powder is poured plurality of conduits such as, tubes which are around the tubes and into the frame which concarried by and bonded to a porous metal block fines the powder. Sufficient metal powder is through which oil may be passed, whereby the used to completely fill the frame and surround oil is filtered arc. hereby cleaned of extraneous is all of the tubes and cover the upper most therematerial and si....1taneously cooled. of, after which the frame with the metal powder A further object is to provide a plurality of therein is preferably vibrated to settle the pewtubes which may be utilized to carry one fluid der, whereupon additional powder is added until and to embed these tube in a block of porous a completely full frame is obtained. Metal pow- :metal through which another fluid may be so ders such as a mixture f copper and ti powpassed, whereby the temperatures of the fluids der in portions of 90 parts copper and parts passing through the two conducting mediums tin. or a pre-alloyed copper-tin powder wheretends to become equalized. in. the tin coats the copper in the same propor- Further objects and advantages of the present tions may be used. The graphite plate with the invention will be apparent from the following filled metal frame thereon. is then placed in a description, reference being had to the accomsintering furnace where it is heated under non panying drawing wherein preferred embodiments oxidizing conditions to a temperature above the of the present invention are clearly shown. melting point of tin and below the melting point In the drawing: of copper preferably in the neighborhood of from Fig. 1 is a sectional view through one em- 1600 to 1925 F. for a period ranging from 15 bodiment of the invention taken on line il of minutes to an hour. Under these temperature Fig. 5. conditions, the tin alloys with the copper and Fig. 2 is a partial fragmentary end view of forms a highly porous bronze block which is the element shown in Fig. 5. integrally bonded to the frame and is likewise Fig. 3 is a sectional view taken on line 3-4 of bonded to the tubes in intimate heat transfer Fig. l. relation thereto. The entire assembly is then Fig. 4 is an end view of the device shown in cooled under non-oindizing conditions to form Fig. 5 wherein one of the header connections a block of porous metal having a plurality of has been removed to show the filter block and copper tubes extending therethrough. tubular radiator therein and To this block, two side plate members 32 and Fig. 5 is a. side view of a complete device. 34 are assembled which have central apertures This invention is particularly adapted to cool- 36 and 38 in the form of connections which may ing devices wherein simultaneous filtering of be threaded for the attachment of pipes or may the medium to be cooled is desired. One emhave tubes clamped thereto .if desired. Plate bodiment of the invention is particularly adaptmembers 40 and 42 may be assembled to the ed for an oil cooler and filter for use in connecother two sides of the block which members have tion with internal combustion engines. One of flanged portions 44 and 46 thereon that hold such combined coolers and filter is shown in the members 32 and 34 in position, The memsection in Fig. 1. This unit as shown is for bers 40 and 42 also have central apertures thereillustrative purposes only since it is apparent 60 through in the form of connections 48 and 50. that many variations and embodiments of the The assembly is nekt soldered or welded around same basic invention may be utilized. The unit and flanges 44 and 46 and along all other open consists of a main body portion 20 that includes Joints to form a hermetically sealed unit to a. plurality of tubes 22 preferably copper, which which access can be gained only through the may have any cross section desired. These connections ,36 and 38 or 48 and 50.

tubes, spaced in the desired relation to one another, are held between a pair of spaced headers 24 and 28 to which they are brazed or welded or otherwise hermetically secured. The headers gsomw is obteined which provides excellent conduction between the filter block and the cooling medium. While the description herein has been limited for my desired purpose. Likewise any other hsve in the filter block. The sintering temperstures are well-known in the srt as ere alloy types of powders. The descriptions of various silo! powders will be found in Olt Patent 2,273,589. Oombinstions 0! metal powder used to mske filtering or metering elements may be noted in Koehring Patent 2,198,702. Both of the foregoing petents ere assigned to the assignee of the present invention.

4 Aisothe tubesflmrbeoisnydesiredmsterisliorexsmplehistesdorcoppenthehihes mybeItsinle-lteeLmlIn-Jlmelmetfl etc. when diiierent porosities cl filtering inedizoflmmeehpowderyieldsverysstisisctory ts. Itistobeunderstoodthstthespecifieembodimentortheinventionmsybevsried-indssignto meettherequiredneedsoilnysnviicetionwhereinsimultsneous coolingsndfiltering likewisethequsntityoiporousmetslmsybe reguleiodlothstthesm'hceereslnrelntimto thesresoithetuhulsrductsprovidesthedosiredthermslefiectsinconneetionwiththequsntityoifiuidsbeingpessedthroughthedevice.

likewise the device may be used es s best trsnsier medium only, when filtering is not de- 45 through said porous metal block.

OLA! RABHUSBIN.

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