US1453220A - Double-walled tube for heating and cooling purposes - Google Patents

Description

Apr. 24 1923.

E. WIIIT N flN DOUBLE WALLED TUBE FOR HEATING AND COOLING PURPOSES Film March 4', 191.3

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Patented Apr, 24, 1923 l WTUEZFNMANN, 0F FFUFXHETFT, GER/MAW.

lDUWllEllLllih-W'MLFFD TURF! FtJlEt HEATING AND tltltlllilllll'fit FURFUSEF.

hpplication tiled March 4t, 19W.

serial No. $203M.

(@lltdlt'l'liltl unnnn THE rnovrarons FF THE ht'lll Hit" ltltllltflld 3, 1953]., ll FTAT. In, 1313.)

This invention relates to a double-walled tube which is intended for heating and cooling purposes and is provided with undulated walls, the undulations running spirally around the tube like the threads of a screw and forming a spirally-shaped channel encompassing the inner space of the tube and serving to receive the heating or cooling medium, such as a liquid, a gas, air, or the like.

"Owing to this configuration oi the heating or cooling tube, the exchange of the heat is very efficacious and the tube is rendered yieldable and pliable so that no special means for compensation and elongation is required.

in order to make my invention more clear, ll refer to the accompanying drawings, in which:

Figure 1 shows a piece of a heating or cooling tube constructed according to my invention, the piece of tube being represented partly in side-view and partly in longitudinal section;

Figures 2, 3, t, 5 and 6 show portions of similarly shaped tube walls in section, the difl'erences being explained in the detailed part of this specification.

Referring to Figure l, the double tube consists of two tubes of approximately screw-threadlilre appearance, one of the tubes enclosing the other, both having undulations torming continuous convolutions or the metal bands 0: b, and the undulations or eonvolutions of the two tubes being ditterently shaped in sectionso as to form be tween themselves a spirally-shaped channel 0 through which the heating or cooling medium, i. e., an appropriate liquid, gas, air, or the like, is led. c is the space within the tube 5, through which the medium to be heated is conducted. The neighbouring rims or edges (5 of the metal bands a and b are tightly connected or united with each otlher by soldering, welding, folding, or the li (e,

in the form of construction shown in Fig ure 2, the sectional shapes of the undulated metal bands are not different, but practically one like the other, each band forming two groove-like depressions and between these latter a ledge-like elevation. The rims at may be connected either by soldering or by electric or autogenous welding.

The form of execution shown in Figure 3 resembles that just described, there being solely the difference that the rims oi the metal bands are covered by an appropriately profiled band 6. instead of employing a special band, such as 6, one of the rims of the outer tube band may be adequately bent round so as to form a fold for connecting the two tube bands with each other as in Figure at.

The section of the metal hands a Z) may be also that of a ll, as shown in Figure 5, the legs oi the Us having diflerent length so as thereby to form the channel 0 The edges oi the legs are again connected with each other by soldering, welding, folding, or in any other manner. Two or more of such or similar ti -shaped grooves or depressions, in connection with an elevation or with elevations between them, may be provided in one metal band of appropriate breadth as shown in Figure 6.

Having now described my invention, what ll claim as new and desire to secure by a patent of the United States is:

1. A double-walled tube comprising an inner wall consisting ct one continuous spiral strip, an outer wall consisting of one con tinuous spiral strip having its oonvolutions extending in the same direction to that ot the strip of the inner wall, the opposite edges of said strips being bent outwardly and the outwardly bent edges of said strips being connected together.

2. A tube of the character described com. prising an inner and outer wall, said walls each consisting of a corrugated strip oi lltltl metal and the opposite edges of said corthe strips together whereby a spiral channel rugated strips being connected together. will be formed.

3. A tube of the character described com- In testimony whereof I afiix my signature prising an inner and outer wall, each of said in presence of two witnemes.

5 walls consisting of a corrugated spiral strip EMIL WITZENMANN.

of metal, the corrugations of each strip ex- Witnesses: tending parallel with the edges thereof and MAso ALT, means for connecting the adjacent edges of FRANZ BINNINGER.

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