KR102346659B1 - Apparatus manufacturing dry ice having curved type piston and dry ice nugget manufactured by the same - Google Patents

Abstract

The present invention relates to a piston having a curved pressing surface so that the density of dry ice is uniformly formed, and a dry ice nugget manufacturing apparatus comprising the same, and provides a piston having a curved pressing surface which comprises a rod extending from the outside of a cylinder and to the inside of the same; and a pressure plate coupled to one end unit of the rod positioned in the inside of the cylinder and extended to touch an inner wall of the cylinder, wherein the pressure plate comprises: a distributed pressing unit formed in a convexly curved shape toward a pressing direction; and a pressing end unit which is in contact with an inner wall of the cylinder at the end unit of the distributed pressing unit and is formed in a flat surface opposite to the pressing direction.

Description

Dry ice manufacturing apparatus with curved piston and dry ice nugget manufactured through the same

The present invention relates to an apparatus for manufacturing dry ice having a curved piston and a dry ice nugget manufactured through the same.

In general, dry ice manufacturing apparatuses are manufactured by exposing liquid carbon dioxide to a low-temperature and high-pressure environment or by compressing fillet-type dry ice. In this method, when liquid carbon dioxide is compressed, it is produced with a relatively uniform density, but in the case of pressure-compressing fillet-type dry ice, if it is pressurized through a flat surface, the part with higher dry ice will be manufactured with high density. There is a disadvantage in that the portion corresponding to a relatively low density is quickly vaporized. This also occurs in a method of manufacturing dry ice by pressurizing liquid carbon dioxide, and manufacturing dry ice of a uniform density has a longer shelf life of dry ice.

Accordingly, in the dry ice manufacturing industry, there is a demand for the development of a shape of a piston to overcome such a disadvantage that occurs when a piston having a flat pressing surface is applied.

Republic of Korea Patent Publication No. 2015-0036855 (2015. 04. 08)

An embodiment of the present invention aims to manufacture dry ice having a high density and a low vaporization rate.

An embodiment of the present invention aims to provide dry ice prepared with a uniform density.

The present invention relates to a piston having a curved pressing surface so that the density of dry ice is uniformly formed, and a dry ice nugget manufacturing apparatus including the same, comprising: a rod extending from the outside to the inside of a cylinder; and a pressure plate coupled to one end of the rod positioned inside the cylinder and formed to be extended in contact with the inner wall of the cylinder, the pressure plate comprising: a distributed pressure portion formed in a convexly curved shape toward the pressing direction; and a pressing end that is in contact with the inner wall of the cylinder at an end side of the distributed pressing unit and is formed in a plane opposite to the pressing direction; a piston having a curved pressing surface is provided.

In addition, the distributed pressing unit may be formed in a hemispherical shape convex in the pressing direction.

In addition, the pressing end can be pressed in the pressing direction the snow moved to the side by being pressed by the dispersion pressing in the pressing direction.

a cylinder in which a pressing space is formed by contact of the first case and the second case; and a piston for pressing the pressurizing space within the cylinder, wherein the piston includes: a rod extending from the outside of the cylinder to the inside; And coupled to one end of the rod positioned inside the cylinder, extended to contact the inner wall of the cylinder, and the distributed pressing portion and the distributed pressing portion formed in a convexly curved shape toward the pressing direction in contact with the inner wall of the cylinder and in the pressing direction A dry ice nugget manufacturing apparatus is provided, including a pressing plate including; a pressing end formed in a plane facing the .

In addition, the distributed pressing unit may be formed in a hemispherical shape convex in the pressing direction.

In addition, the pressing end can be pressed in the pressing direction the snow moved to the side by being pressed by the dispersion pressing in the pressing direction.

According to one embodiment of the present invention, it is possible to provide a dry ice nugget manufacturing apparatus capable of exposing snow to a higher pressure environment in order to manufacture dry ice having a high density and a low vaporization rate.

According to an embodiment of the present invention, there may be provided an apparatus for manufacturing dry ice in which the pressing surface of the piston includes a convex curved surface in the pressing direction in order to form dry ice manufactured with a uniform density.

11 is a view showing an apparatus for manufacturing dry ice nuggets according to an embodiment of the present invention. FIG. 11 (a) is a view showing that the first case and the second case are positioned at the origin in a spaced apart state, and FIG. 11 ( b) is a view showing that the cylinder is formed by contact between the first case and the second case as the first case is raised, and FIG. 11(c) is a view showing that the piston moves in the pressing direction in the cylinder.
9 is a view showing a piston according to an embodiment of the present invention;
10 is a view showing that the piston according to an embodiment of the present invention moves in the pressing direction;
11 is a view showing a dry ice nugget produced by a dry ice nugget manufacturing apparatus according to an embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example, and the present invention is not limited thereto.

In the description of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms to be described later are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification.

The technical spirit of the present invention is determined by the claims, and the following examples are only one means for efficiently explaining the technical spirit of the present invention to those of ordinary skill in the art to which the present invention belongs.

Figure 1 is a view showing that the conventional pellets (2a) are extruded, Figure 2 is a view showing that the conventional pellets (2a) are compressed to produce dry ice, Figure 3 is the conventional pellets (2a) compressed It is the dry ice nugget 10 manufactured by doing this.

1 to 3, the conventional dry ice manufacturing method is to produce dry ice by exposing carbon dioxide to an environment such as a predetermined atmospheric pressure and temperature to manufacture fillet-shaped solid carbon dioxide, and then secondary molding it to produce dry ice. will be. As shown in FIG. 1, when the extrusion pellets 2 are manufactured through the extrusion head 1, the dry ice nuggets 10 are accommodated in the cylinder 4 and pressurized with the piston 3, which is formed by compression between the pellets 2a. It is manufactured.

The dry ice nuggets 10 manufactured through this manufacturing process are primarily press-molded in the process of being extruded, and are secondarily press-molded between the pellets 2a. At this time, the finally press-molded pellets (2a) to be pressurized may be in a state in which the density is formed high because it is already pressurized to a predetermined level. Therefore, it is difficult to perform compression molding through this even if additional pressing is performed. That is, a higher pressing force is required for compression molding, and even when compression molding is performed through pressing, since the smallest particle is the size of the pellets 2a, voids 12 may be formed between the pellets 2a.

Furthermore, considering that the size of the pellets 2a is generally formed to be 3 mm or more based on the diameter, the conditions in which the voids 12 are formed between the compressed pellets 11-1 are formed. Of course, when the pellet (2a) is a rectangular parallelepiped of the same size and pressed in an aligned state, the void 12 may not occur, but it is effective to extrude the pellet 2a in a circular cross-sectional area during the extrusion process. Therefore, in the compression molding process between the compression pellets 11-1, the generation of the voids 12 is inevitable.

4 is a flowchart illustrating a procedure for manufacturing dry ice according to an embodiment of the present invention, and FIG. 11 is a schematic diagram illustrating manufacturing of dry ice according to an embodiment of the present invention.

Referring to FIG. 4 , the method for manufacturing a dry ice nugget 10 from liquefied carbon dioxide according to the present invention includes an injection step (S10) in which liquefied carbon dioxide is injected into a cylinder 4 having a predetermined internal space formed therein, in the internal space. A solidifying step (S20) in which liquefied carbon dioxide is solidified and accumulated at the bottom of the cylinder (4), a pressing step (S30) in which the piston (3) located at the upper end of the cylinder (4) descends to pressurize a predetermined internal space (S30) and the piston (3) ) may include a molding step (S40) of compression molding the liquefied carbon dioxide in a solid state pressurized by the

Here, the particle size of the solidified liquefied carbon dioxide may be at least less than 1 mm. Preferably, according to the nozzle of the supply unit 5 shown in FIG. 11, the particle size of the liquefied carbon dioxide may be determined within a micrometer unit. Of course, the present invention is not limited thereto and may be determined according to the nozzle structure, and a smaller particle size is preferable, but may have a particle size of at least 1 mm.

In addition, the predetermined internal space at the point in time when the liquefied carbon dioxide is injected may be in a state of atmospheric pressure. The liquefied carbon dioxide injected into the atmospheric pressure state may lower the internal temperature of the cylinder 100 . At this time, the liquid carbon dioxide solidified by the descent of the piston 200 may be compressed. That is, the dry ice nuggets 10 can be formed by exposure to a low-temperature and high-pressure state.

Since the dry ice nugget 100-1 manufactured through this process has a small particle size and is in a state in which the initial compression is made, the air gap 12 between the particle sizes solidified to the level of the snow 100a does not occur. may not be That is, it can be formed to have a high density due to a low volume to mass ratio. The dry ice nugget 100-1 (refer to FIG. 9) of the present invention, which is formed with a high density, has no pores 12 and thus has a narrow surface area exposed to the air, so that the sublimation rate may be slow. In this way, dry ice that can be cooled for a longer period of time can be manufactured.

10 is data obtained by testing the sublimation rate of the dry ice nugget 100-1 according to an embodiment of the present invention and the dry ice nugget 10 manufactured through the conventional compressed pellet 11-1. Then, the dry ice nuggets 10 and 100 may be sublimed while proceeding from the first sublimation section V1, F1 to the second sublimation section V2, F2. Here, the difference between the present invention and the conventional dry ice nuggets 10 and 100 manufactured by compressing the pellets 2a lies in the sublimation rate, which lies in the existence of the aforementioned voids 12 . It can be seen that in the sublimation section of the dry ice nugget 100-1 of the present invention, the slope of the second sublimation section V2 is more gentle than that of the first sublimation section V1. This is because there is no curved pole, and when the dry ice nugget 100 - 1 is manufactured in a cube shape as shown in FIG. 9 , the surface area decreases as the dry ice nugget 100-1 is sublimed, and the sublimation rate may be slowed.

On the other hand, in the dry ice nugget 10 manufactured by compressing the pellets 2a, the slope of the second sublimation section F2 is greater than that of the first sublimation section F1, which means that the sublimation speed is accelerated. do. This means that as the dry ice nugget 10 exposed to the atmosphere through the pores 12 sublimes, the exposed surface area increases and the sublimation rate gradually increases. It can be seen that the sublimation rate is lowered.

Considering this sublimation trend and duration, the method of manufacturing the dry ice nuggets 100-1 from liquefied carbon dioxide, which is an embodiment of the present invention, is a high-density dry ice nuggets 100-1 that can perform a more effective cooling function. ) can be produced.

Hereinafter, a configuration for manufacturing dry ice nuggets by press-molding the above-described liquefied carbon dioxide will be described in more detail.

The piston 200 having a curved pressing surface, which is an embodiment of the present invention to be described below, has a convex curved pressing surface, so that uniform distribution of the snow 100a can be made when pressing, and the uniform snow 100a The distribution may be made of dry ice nuggets 100 - 1 having a uniform density during compression molding by the piston 200 . That is, the curved shape of the pressing surface induces even and uniform distribution of the snow 100a so that the entire dry ice nugget 100-1 has a uniform density during pressing.

11 is a view showing an apparatus for manufacturing a dry ice nugget 100-1 according to an embodiment of the present invention, and FIG. 11 (a) is an origin with the first case 110 and the second case 120 spaced apart from each other. 11(b) is a view showing that the cylinder 100 is formed by the contact between the first case 110 and the second case 120 due to the elevation of the first case 110. , FIG. 11( c ) is a view showing that the piston 200 moves in the pressing direction within the cylinder 100 .

11A to 11C , an apparatus for manufacturing a dry ice nugget 100 - 1 according to an embodiment of the present invention includes a cylinder 100 and a piston 200 . Specifically, the cylinder 100 includes a first case 110 and a second case 120 . The first case 110 and the second case 120 may be spaced apart from each other while positioned at the origin. The first case 110 and the second case 120 may come into contact with each other by movement of at least one of the first case 110 and the second case 120 , and the contacting state forms the inner space of the cylinder 100 . can do. The inner space may be a pressurized space (P). The pressure space (P) is pressurized by the movement of the piston (200) located on the second cylinder (100) side may increase the pressure. That is, when the pressure space (P) is formed inside the cylinder 100, the volume of the pressure space (P) decreases as the piston 200 moves to the pressure space (P), and the reduced volume increases the pressure relatively. do.

Here, the increased pressure may be determined in the range of 16 bar to 20 bar. Dry ice may be formed within the above pressure range. Of course, the dry ice may be formed by the piston 200 pressing the pressurizing space P in a state in which liquid carbon dioxide or snow 100a is injected. The injection of liquid carbon dioxide or snow 100a may be injected through a supply hole formed on one side of the second case 120 .

Here, in the case of liquid carbon dioxide, it is received relatively uniformly while forming a horizontal plane, but in the case of the snow 100a, it is difficult to accumulate relatively evenly, such as being made of solid particles to form a horizontal plane, and a relatively large amount of accumulation may occur in some parts. When a portion with a large accumulation amount is pressed in the pressing direction by a flat pressing surface, a portion with a relatively small accumulation amount is formed to have a higher density than the compressed portion, and a portion with a small accumulation amount is formed to have a low density. The non-uniform density according to the accumulated amount is a factor of lowering the sustained speed of the manufactured dry ice.

In order to overcome this point, in the case of the piston 200 to be described below, the pressing surface is formed in a curved surface, so that the snow 100a, which is non-uniformly accumulated when in contact with the snow 100a, is relatively even and compressed at the same time. do.

9 is a view showing a piston 200 according to an embodiment of the present invention.

Referring to FIG. 9 , the piston 200 includes a rod 201 and a pressure plate 210 coupled to one end of the rod 201 . The pressing plate 210 includes a distributed pressing portion 211 and a pressing end 212 on the pressing surface. The distributed pressing unit 211 may have a curved surface, and may be convex in the pressing direction. An example is a form in which a curved surface is formed in the transverse direction with respect to the pressing direction, but the curved portion of the pressing surface is not limited thereto, and if it is a type in which a convex curved portion is formed in the pressing direction, such as a hemispherical convex shape, the shape is not limited. Of course, it may be preferably a curved flat-type pressing surface as shown.

This shape has a high probability that the point most advanced in the pressing direction due to the convex shape will first touch the snow 100a during pressing, and the snow 100a is pushed to the peripheral portion 11d by the distributed pressing portion 211 of the curved surface and dispersed can be In the dispersion and pressing direction, the dispersion amount may be increased as the curvature of the dispersion pressing part 211 increases. This pushes the snow 100a in a direction in which the dispersion direction of the snow 100a is perpendicular to the curved surface, thereby dispersing the snow 100a to both sides from the most protruding point of the dispersion pressing unit 211 . Of course, this is a description according to the illustrated example, and when the dispersion pressing part 211 is provided to be convex in a hemispherical shape including a curved part, the snow 100a may be radially distributed from the most protruding point in the dispersion direction.

That is, the distributed pressing part 211 as a structure for dispersing the snow 100a is preferably located at the center of the pressing surface even if there is a change in shape on the premise that it includes a curved part, Snow 100a may be dispersed from the center to the periphery 11d of the center, such as on both sides or radially.

When the dispersion of the snow 100a is made through the process of dispersing the snow 100a described above, the pressure in the continuous pressing direction of the piston 200 can press the dispersed snow 100a. This is compressed by contact, and the snow 100a may be molded while increasing the density.

That is, the distributed pressing unit 211 having a curved shape among the pressing units of the piston 200 can manufacture the dry ice nuggets 100 - 1 having a uniform density by performing from dispersion to pressing of the snow 100a.

10 is a view showing the movement of the piston 200 in the pressing direction according to an embodiment of the present invention.

Referring to FIG. 10 , the piston 200 may pass through the first pressing section S1 and move to the second pressing section S2 . Since the supply of the snow 100a may be made before the movement of the piston 200 , the snow 100a may be transferred with increased pressure according to the movement of the piston 200 . The piston 200 presses the snow 100a through the first pressing section S1 formed inside the first cylinder 100 and through the second pressing section S2 formed inside the first cylinder 100. can do.

On the other hand, since the snow 100a is provided inside the cylinder 100 and then a separate process such as leveling is not performed, the accumulated amount of the snow 100a provided may be different for each part on the support 300 . When the snow 100a, each of which has a different cumulative amount, is pressed by the pressing plate 210, a portion with a large accumulation amount is formed at a high density, and a portion with a small accumulation amount is formed with a low density, and the portion formed with a low density has a relatively high vaporization rate. It may be non-uniformly vaporized, which may be a cause of accelerating the vaporization rate of the dry ice nugget 100 - 1 as a whole.

In order to prevent this, a distributed pressing unit 211 of a curved surface capable of dispersing the snow 100a is provided, the distributed pressing unit 211 increases the pressure, and the snow 100a through contact with the snow 100a. By dispersing the non-uniform accumulation state, it is possible to disperse the snow 100a in a form corresponding to the molding shape. This is a kind of pre-treatment capable of manufacturing the dry ice nuggets 100 - 1 having a uniform density through compression molding of the snow 100a by contact with the dispersion pressing unit 211 . This is performed by the distributed pressing unit 211 of the pressing plate 210 .

Furthermore, when the pressing end 212 is positioned at at least both ends from the distributed pressing unit 211 and the distributed pressing unit 211 protrudes in a hemispherical shape, the pressing end 212 may be formed in a ring shape. That is, the shape is not limited to a specific shape as long as the above conditions are satisfied.

The pressing end 212 may be formed in a plane and formed in a direction parallel to the pressing direction so that the snow 100a distributed laterally by the distributed pressing unit 211 may be more effectively aggregated. This is because the pressurized end 212 side before the snow 100a moved to the special surface by the distributed pressing unit 211 is moved to the area where the pressurized end surface is pressurized, so the moving snow 100a is It cannot enter the moving direction of the relatively dense pressing end 212 . That is, the snow 100a is pressed by the distributed pressing unit 211, and the snow 100a located on the front side in the pressing direction of the distributed pressing unit 211 is within the range of the front side after contact with the distributed pressing unit 211. can be compressed in

11 is a view showing a dry ice nugget 100-1 produced by an apparatus for manufacturing a dry ice nugget 100-1 according to an embodiment of the present invention.

11 shows an example of the dry ice nugget 100-1 manufactured by the above-described dry ice nugget 100-1 manufacturing apparatus, the curved portion 11a being pressed by the distributed pressing portion 211 including the curved portion. and a dry ice nugget 100 - 1 including a flat portion 11b formed by the pressing end 212 . Preferably, in the dry ice nugget 100-1, the densities of the central portion 11c and the peripheral portion 11d are preferably equal to each other and may be equal to each other when comparing arbitrary portions per unit volume with each other. At least this can achieve an improved result in uniformity over the density difference between any portions in the non-uniform dry ice nugget 100 - 1 . These results show that the dry ice nugget 100-1, which can be used for a longer period of time than the flat dry ice nugget 100-1 manufactured with the same amount of snow 100a, by delaying the evaporation rate of the dry ice nugget 100-1, can be manufactured.

Although representative embodiments of the present invention have been described in detail above, those of ordinary skill in the art to which the present invention pertains will understand that various modifications are possible without departing from the scope of the present invention with respect to the above-described embodiments. . Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims as well as the claims and equivalents.2

1: extrusion head
2: Extruded pellets
2a: pellet
3: piston
4: cylinder
5: supply
10, 100-1 : nuggets
11-1: compressed pellets
12: air gap
11: Dry Ice Nuggets
11a: curved part
11b: flat part
11c: central part
11d: periphery
100: cylinder
100a: Snow
110: first case
120: second case
200: piston
201 : load
210: pressure plate
211: distributed pressurization unit
212: pressing end
300: support
S1: 1st pressing section
S2: second pressing section
P : pressurized space
M : moving direction
S: injection direction
V1, F1: 1st sublimation section
V2, F2: 2nd sublimation section
S10: spraying step
S20: solidification step
S30: pressurization step
S40: forming step

Claims (7)

a cylinder including a supply unit connected so that liquefied carbon dioxide is injected into the inner space;
a rod extending inwardly from the outside of the cylinder; and
Including; and a pressure plate coupled to one end of the rod positioned inside the cylinder and extended to contact the inner wall of the cylinder.
The pressure plate,
a distributed pressing part formed in a convexly curved shape toward the pressing direction; and
Including; a pressing end formed in a plane opposite to the pressing direction and in contact with the inner wall of the cylinder at the end side of the distributed pressing unit;
The liquefied carbon dioxide injected into the cylinder is solidified and accumulated to a particle size of less than 1 mm by a nozzle coupled to the cylinder, and the solidified liquefied carbon dioxide is compressed so that the gap formed between the particle sizes is smaller than the particle size. Dry ice maker with curved piston.
The method according to claim 1,
The distributed pressing unit,
Dry ice manufacturing apparatus having a curved piston, which is formed in a hemispherical shape convex in the pressing direction.
The method according to claim 1,
The pressing end
A dry ice manufacturing apparatus having a curved piston for pressing the snow, which has been pressed by the dispersion pressing unit in the pressing direction and moved laterally in the pressing direction, in the pressing direction.
delete The method according to claim 1,
The dry ice manufacturing apparatus having a curved piston, wherein the internal space at the point in time when the liquefied carbon dioxide is injected is in an atmospheric pressure state.
delete A dry ice nugget manufactured by the dry ice manufacturing apparatus having the curved piston according to claim 1 .

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