US2376749A

US2376749A - Radiator

Info

Publication number: US2376749A
Application number: US483453A
Authority: US
Inventors: Belaieff James Frank
Original assignee: Individual
Current assignee: CYRIL TERENCE DELANEY AND GALLAY Ltd
Priority date: 1942-01-16
Filing date: 1943-04-17
Publication date: 1945-05-22
Anticipated expiration: 1962-05-22
Also published as: FR923514A

Description

May 22, 19,45.y l J. F. BELAIEFF 2,375,749

RADIATOR Filed April 17, 1943 5 Sheets-Sheet l May 22, 1945- l J. F. BELAn-:FF 2,376,749

RADIATOR Fiied April 17, 1943 5 Sheets-Sheet 2 @f fm Patented May`22, 1945 RADIATOR James Frank Belaieif, Gricklewood, London, England, assignor of two-thirds to Cyril Terence Delaney and Gallay, Limited, Cricklewood, London, England, a company of Great Britain Application April 17, 1943, Serial No. 483,453 In Great Britain January 16, 1942 6 Claims.

This invention relates to plate heat exchange apparatus and more particularly to plate heat exchange apparatus of the kind known as secondary surface heat exchange apparatus.

Radiators for use in the cooling system of internal combustion'engines on aircraft must be designed to transfer the largest possible amount of heat in relation to its weight and overall dimensions.

The resistancelto the flow of the cooling and coolant media must be kept as low as possible and the number of joints required must be kept down to the minimum in order to reduce risk of leakage.

The object of the present invention is to provide a new construction of heat exchange unit which will embody as many as possible of the above desired features.

A heat exchange unit according to the present invention comprises a plurality of walls strutted in spaced relationship wherein the struts differ in thickness between adjacent pairs of walls whereby the heat conductivity of the strut is proportional to the amount of heat required to be conducted thereby. One of the said walls may constitute a main wall separating the two-media. Where two or more intermediate walls are provided the thickness of the strut would be greatest between the main wall and the rst wall and decreasing between each pair of successive intermediate walls from the main wall.

The apparatus may comprise at least two adjacent main walls separating cooling and coolant media, and at least two subsidiary walls situated wholly in the cooling or coolant media and struts between said main and subsidiary walls, wherein the struts between said main walls are thicker than the struts between the subsidiary walls and the main walls whereby the heat conductivity of the strut is proportional to the amount of heat required to be conducted thereby. The apparatus may comprise three or more walls strutted together in spaced relationship, wherein one of said walls is a main wall separating cooling and coolant media and at least two of said walls are in-` termediate walls situated wholly in one of the media wherein the thickness of the strut is greatest between the main wall and the first intermediate wall and decreasing between each pair of successive intermediate walls from the main wall. The walls themselves which form partitions dividing up the space through which one of the mediums is to circulate may vary in thickness, i, e., may be reduced in thickness the further it is positioned from a main wall, and may differ in thickness from the corrugated strips.

In order that the invention may be more clearly understood, reference will now be made to the drawings attached hereto:

Fig. 1 is a front elevation, and

Fig. 2 is a sectional plan on the line 2-2 of Fig. 1 of a radiator block made in accordance with the present invention :for use on an aircraft;

Fig. 3 is an enlarged sectional view through a portion of the block shown in Fig. 1, and

Fig. 4 is a section on the line 4-4 of the portion shown in Fig. 3.

Figs, 3 and 4 are drawn on a much larger scale inorder to show the constructional features.

Fig. 5 is an enlarged detail perspective view, partly in section and partly broken away, of a portion of the heat exchange apparatus.

Fig. 6'is an enlarged detail sectional view illus trating a modification of the invention.

In the form shown in the drawings, the radiator block comprises a number of thin walls formed by metal plates 2 (see Figs. 3 and 4) held in spaced relationship by a corrugated strip 3. The plates are arranged in pairs with the corrugated strips between them, each pair of plates being sealed at both edges in such a manner as to form a flat tube 4 (see Figs, 1 and 2) equal in height to the height of the block and in width to the thickness from front to rear of the block. The corrugated strip 3 is soldered by the apices of the corrugations to the sidewalls 2 and is mitered in such a manner that it divides the space between them into a series of V-shaped tubes through which the medium to be cooled is arrangedto flow.

Heat from the medium to be cooled will be transmitted to the wall 2 either by direct contact with the wall or through the strip 3. Reference to Fig. 1 will show that the block comprises a number of such tubes 4. Between the tubes 4 is the space to be traversed by the cooling medium which in the case of the present radiator is, of course,air. This space is divided by two

walls

5 and 6 arranged parallel with the tubes so that tioned between the wall 5 and the next main wall of the next tube 4. As in the case of the tube 4 the corrugated strips l, 8 and 9 are secured by solder to the walls between which they are positioned so that they hold the respective walls in spaced relation whilst at the same time acting as conductors of heat. Since the strips 'l and 9 are in immediate contact with a main wall of a tube 4 they are made of heavier gauge than the strip 8 which is between the two

intermediate walls

5 and 6, likewise the

intermediate walls

5 and 6 are of a lighter gauge than the walls of the tube 4, the reason being that the further one gets from the main wall the less is the heat which has to be dissipated as all this heat has to be conducted through the Walls and along the strips. The

strips

1, 8 and 9 are arranged with their corrugations at right angles to the corrugations of the strips 3 because the cooling fluid, inA this case, air, will be flowing in that direction. The

strips

3, 1, 8 and 9 respectively are, therefore, arranged so as to offer the leastpossible resistance to the flow of the coolant and cooling medium respectively.

It is of course to be understood that the ends of the tubes 4 are sealedy into and are connected with the tanks at the top and bottom of the block as would be done in normal practice.

Although the invention has been described showing two intermediate walls between the tubes 4 it must not be assumed that the. invention is limited to the use of two intermediate walls. Three or more intermediate walls may be used and in some cases the further intermediate walls would graduate in thinness as they recedey from the main wall as likewise would the thickness or gauge of the corrugated strips which are interposed between the respective walls. The tubes for the coolant liquid have been shown each with a single corrugated strip but it must be appreciated that the same construction could be applied if desired to the passages formed by the said tubes for the coolant liquid as has been described with reference to the passages for the cooling medium, that is to say that intermediate walls may be employed using different gauges .for the' intermediate walls and differing gauges for the interposed corrugated strips. In the case where a single intermediate wall is employed this may be thinner than the corrugated strip;

In the precise example shown the

walls

5 and 6 and the strip 8 are .003" thickness whilst the strips 'l and 9 are .005 thickness, the walls 2.are .005 thickness and the strip 3 .003" thickness.

A further development of the principle ofthis invention illustrated in Fig. 6 of the drawings consists in reducing the gauge of the corrugated strips and the intermediate walls along the direction of air flow, for example, the corrugated strips may be made in sections such as 11, 12, 13 of decreasing gauges and the intermediate walls may be built in small sections such as 51, 52, and 53 of decreasing gauges. The thickest strips are at the front of the radiator where the maximum heat transfer takes place, and the thinner strips being at the rear of the radiator where the minimum heat transfer takes place.

It will be seen that by the present invention the most economical use is made of the material, the heat conductors are proportional in .cross sectional area to the heat which they are required to conduct and the whole structure is one of great strength whilst the joints are reduced to the barest minimum.

What I claim and desire to secure by Letters Patent is:

l. A radiator comprising at least two pairs of adjacent imperforate main walls coextensive in area with the main walls and forming coextensive spaces between them separating cooling and coolant media, and at least two imperforate subl sidiary Walls situated wholly in the cooling or coolant media and corrugated struts between said main and subsidiary walls, the struts between said main walls being thicker than the struts betweenv the subsidiary walls and the main walls whereby the heat conductivity of the strut is proportional to the amount of heat required to be conducted thereby.

2. A radiator, comprising a plurality of walls strutted together by corrugated strips in spaced relationship, one of said walls being a mainwall separating cooling and coolant media and at least two of said walls being intermediate walls situated wholly in one of the media the thickness 0f the strut being greatest between the main wall and the rst intermediate wall and decreasing between. eachpar of successive intermediate walls from the main wall for the purpose set forth, all of said walls being imperforate and coextensive in area with one another.

3. A radiator, comprising a plurality of walls spaced apart to form a plurality of tubes and a plurality of channels between said tubes, all of said walls being coextensive in area with one another and with. the area of the radiator and the channels and tubes being also coextensive a corrugatedstrip disposed in each of said tubes and channels and forming a strut device and the corrugated strips of the tubes and the channels being arranged at right angles to each other, each of said strips consisting of a single layer of uniform thickness throughout its length, the strips in intermediate channels being of. less thickness than the strips in channels adjacent the tubes.

4. A radiator as set forth in claim 3, the walls forming said channels varying in thickness.

5. A radiator as set forth in claim 3, the walls forming said channels being reduced in thickness the further they are spaced from the walls forming the tubes.

6. A radiator as set forth in claim 3, the walls formingsaid channels being of different thickness from each other and from said struts.

JAMES. FRANK BELAIEFF.