US2127300A - Method for making dry ice blocks - Google Patents

Description

11 1938.. J. KOBOLD 2,127,300

METHOD FOR MAKING DRY ICE BLOCKS Filed March 12, 1935 2 Sheets-Sheet l 'Aug. 16, 1938. J. KOBOLD 2,127,300

METHOD FOR MAKING DRY ICE BLOCKS Filed March 12, 1935 2 Sheets-Sheet 2 Patented Aug. I6, 1938 UNITED STATES PATENT OFFICE METHOD FOR MAKING DRY ICE BLOCKS J os efKobold, Esslingen-on-the-Neckar, Germany,

assignor to Maschinenfabrik Esslingen, Esslingen-on-the-Neckar, Germany Application March 12, 1935, Serial No. 10,610 In Germany March 23, 1934 4 Claims. (tCi. 62-121) The present invention relates to a method for through the charge conduit 5 which is connected compressing carbon dioxide snow into blocks of to one of the lateral parts, namely, part d. The dry ice. width of part 4 is independent of the dimensions It is an object of the present invention to proof the center part of the chamber or its other 5 vide a method and apparatus for compressing lateral parts and may have large cross sectional 5 carbon dioxide snow into dry ice, whereby large dimensions. Charge conduit 5 may be directly blocks of dry ice can be obtained, and the snow connected to the producer of the carbon dioxide producing chambers to which the compression snow or be part of the producer which, for the apparatus is connected temporarily or perma-' before stated reasons, may have large cross secnently, may have any desired dimension and can tional dimensions and great capacity. 10 be of large capacity. The carbon dioxide snow entering lateral part t A further object of the present invention resides is pushed towards the center part of the compresin the provision of a method and apparatus for sion chamber by means of piston- 6, the cross seccompressing carbon dioxide snow into dry ice by tion of which conforms with the interior cross means of which large blocks of dry ice of any section of part i. Piston 6 is adapted to slidably l5 cross sectional dimension can be obtained and move within part t. Piston rod l connects piston whereby the density ofthe ice is homogenous over 6 with an operating piston 8 adapted toreciprothe whole block. catingly move within operating cylinder 9 having Another object of this invention is to provide admission and outlet openings I0 and H for the a, method and apparatus for compressing carpassage of an operating medium in and out of 20 bon dioxide snow into dry ice by means of which cylinder 9. When in the position furthest inward, large blocks of dry ice can be made and whereby i. e., closest to center part i, the front surface it the center part of the block is prepressed, and a of piston 6 closes the opening formed by the particularly dense core of the block is obtained. intersection of part 4 and center'part l and forms,

Another object of this invention resides in the together with lateral parts 2 and 3, a continuous 25 provision of a method for compressing carbon chamber consisting of parts 2, i, and 3. Part 2 dioxide snow into dry ice by means of which serves chiefly for receiving the counter piston Iii large blocks of dry ice of great specific weight which is mounted on cover M for closing part i can be obtained. of the compression chamber. Piston l3 and cover Further and other objects of thepresent in M are mounted to a piston rod l carrying operat- 30 vention will be hereinafter set forth in the acing piston 8 adapted to reciprocatingly move companying specification and claims and shown within operating cylinder 9 and to thereby operin the drawings which, by way of illustration, ate piston l3. ISis the compression piston proper show what I now consider to be a preferred emoperating in part 3of the compression chamber.

bodiment of my invention. Similarly as are the other pistons, piston iii is 35 In the drawings: provided with and operated by piston rod 1" car- Fig. 1 is a part cross sectional side view of an rying piston 8" operating in cylinder 9''. The apparatus according to my invention taken along snow is first pushed into center part i by means line l-l in Fig. 2. of piston 6 and then further compressed by pis 40 Fig. 2 is a part cross sectional top view of an ton 65, while piston 83 either stands still and preto apparatus according to my invention taken along vents the exit of snow and dry ice through outlet line 2-2 in Fig. 1. opening i6 of part 2 or moves towards the center Fig. 3 is a part cross sectional side view of an part of the compression chamber and counter to apparatus according to my invention taken along piston i5. Pistons t and i5 may also move simulline 3--3 in Fig. 2. taneously or partly simultaneously towards center 45 Fig. 4 is a part cross sectional side view of an part I. It is obvious that, by this action of th' apparatus according to my invention as shown pistons and the configuration of the compression in Fig. 3 and having provisionsfor making blocks chamber, a homogenous and effective compresof various cross sectional configurations. sion of the snow is obtained; of particular impor- Like parts are designated by like numerals in tance is the precompression of the mass of snow by 50 all figures. means of piston 6, whereby a solid core 15 created Referring more particularly to the drawings: i in the ice block in contradistinction to other represents the central part of a compression methods, whereby the core of the ice block is chamber having lateral parts 2, 3, and 4. The usually quite soft. Withmymethod andapparachamber is filled with carbon dioxide snow tus, the snow is actively compressed from three 66 sides, and the highest possible specific weight of the dry ice block is obtained.

With my method and apparatus. blocks of dry ice of any desired cross sectional configuration can be obtained. For example, if cylindrical blocks are desired, piston l5 shown in Figs. 1, 2, and 3 and having rectangular cross section is replaced by a cylindrical piston, and the face I2 01 piston 6, which is flat when making blocks dioxide snow-generators i9; these generators may have large dimensions and capacity for the previously described reasons, and the number of individual generator cylinders can, be .considerabiy reduced in plants using mynew compression system as compared with plants using other compression systems.

While I believe the above described embodiments of my invention to be'preferred embodiments, I wish it to be understood that I do not desire to be limited to the exact details of method, design and construction shown and described, for obvious modifications will occur to a person skilled in the art.

What I claim as new is:

1. The method of producing a block of dry ice from carbon dioxide snow consisting in filling the snow into a preco'mpression chamber, in simultaneously precompresslng the snow in said chamber, and in pushing the snow into another chamber and then subjecting the snow to forces acting in opposition to each other and exerting further pressure on the precompressed snow in a direction which is different from the direction in 'which pushing and precompressing takes place.

2. The method of making a block of solid carbon dioxide consisting in shearing from a column of carbon dioxide crystals a body of carbon dioxide crystals, in pushing said body into a compression chamber and thereby precompressing it, and then further actively exerting pressure on said body in a direction which is different from the direction in which said body is pushed andprecompressed and in thereby compressing said body into a block of solid carbon dioxide.

3. The method of making a block of solid car- .bon dioxide consisting in shearing from a column ofcarbon dioxide crystals a flat body of carbon dioxide crystals, in pushing said body into a compression chamber and thereby compressing it, and then further actively exerting pressure-en said body in a direction which is difierent from the direction in which said body is pushed and precompressed and in thereby compressing said body into a. block of solid carbon dioxide.

4. The method of treating solid carbon dioxide which consists in forming a mass of snow of a predetermined outline, and in subjecting the mass to a plurality of forces acting with such intensity and in such directions with respect to each other as to deform said mass and form a block of dry ice of homogeneous structure throughout.

JOSEF KOBOLD.

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