JPH07318210A - Quick freezing device - Google Patents

Abstract

PURPOSE:To shorten a freezing time and save the consumption of liquefied carbon dioxide gas by permitting the intermittent injection of liquefied carbon dioxide gas and eliminating the variation in temperature. CONSTITUTION:A plurality of stages of freezing racks 2 are provided in a freezing chamber 1, on which heat insulating treatment is applied, a conduit 3 for introducing liquid carbon dioxide gas is arranged at the upper part of the freezing chamber 1 and the conduit 3 is branched into a plurality of fine conduits 3A through a header 6. Respective fine conduits 3A are extended so as to inject liquid carbon dioxide gas against the matter 5 to be frozen on the freezing racks 2 of respective stages while respective tip ends of the fine conduits are provided with one injection port 4 respectively. The conduit 3 is connected to a liquid carbon dioxide gas bomb 8 through a solenoid valve 7 so as to be capable of intermittent injection. On the other hand, an evaporator 9, connected to a refrigerating machine 11, is arranged in the freezing chamber 1 in accordance with necessity while a fan 10 is arranged behind the evaporator 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a quick freezing device for rapidly freezing food.

[0002]

2. Description of the Related Art As a method for freezing foods or the like, there is slow freezing in which a substance to be frozen is frozen in a freezer over a period of time from room temperature by the cooling action of a refrigerator or the like. , When it is thawed, the flavor is reduced, and the taste is greatly impaired. Further, when meat or fish is slowly frozen, the quality of the meat easily deteriorates when it is thawed, a large amount of drip flows out, and umami components and nutrients contained therein are lost. In addition, when vegetable foods such as vegetables are slowly frozen, they become messy when they are thawed, which is completely different from the fresh state. Such a problem is that in slow freezing, the time for passing through the maximum ice crystal production zone in the range of 0 ° C to -7 ° C generally becomes long, and the ice crystals produced in the frozen material become large, It occurs because the cells of the frozen material are destroyed by ice. Therefore, rapid freezing with a short time for passing through the maximum ice crystal formation zone has been developed, and the needs thereof have been increasing in recent years.

There are various rapid freeze methods, but the following two types are known as typical methods. One is a method in which the frozen material is placed in a tank containing an antifreeze solution containing ethyl alcohol as a main component, and the material is immersed for a certain period of time for rapid freezing. Put a frozen product, spray liquefied nitrogen gas or liquefied carbon dioxide gas, and the heat of vaporization taken when the liquefied nitrogen gas or liquefied carbon dioxide gas evaporates, and the dry ice generated from the liquefied carbon dioxide gas spouted sublimes. It is a method of rapidly freezing the frozen material by utilizing the heat of sublimation when it becomes carbon dioxide gas. Comparing the method of immersing in the antifreeze liquid and the method of spraying the liquefied gas, the freezing performance itself is generally superior to the former method of immersing in the antifreeze liquid. However, in the case of this dipping method, it is usually necessary to put the film in the antifreeze bath with the film covered, which is time-consuming, and alcohol may still get inside the frozen material. Therefore, it cannot be used for some things. Therefore, when performing rapid freezing, it is usual to use these two methods properly depending on the type of frozen material. When spraying liquefied carbon dioxide gas, a refrigerator may or may not be used together.

By the way, as a typical example of a rapid freezing device for spraying liquefied carbon dioxide gas, two types shown in FIGS. 7 and 8 are conventionally known.

In a quick freezing device having a schematic structure shown in FIG. 7, a freeze shelf 1 having a plurality of upper and lower stages is provided inside a freeze store 1 that has been subjected to heat insulation processing.
In addition, a conduit 3 for introducing liquefied carbon dioxide gas from the outside is arranged at the upper part of the freezer 1, and a plurality of jet ports 4 are provided at the same height at the tip horizontal part of the conduit 3 continuously or intermittently. It is designed to eject liquefied carbon dioxide gas.
In the figure, reference numeral 5 indicates an object to be frozen placed on the freezing shelf 2.

Further, the rapid freezing apparatus shown in the schematic structure in FIG. 8 has a plurality of upper and lower freezing shelves 2 provided inside a freezer 1 which has also been heat-insulated, and a liquefied carbon dioxide gas is supplied from the outside. The conduit 3 to be introduced extends downward along the side of the freezing shelf 2 inside the freezer 1, and the downward extending portion is provided with a freezing shelf so as to eject the liquefied carbon dioxide gas toward the frozen object 5 at each stage. A jet port 4 is provided for each.

[0007]

In a rapid freezing device for performing rapid freezing by jetting liquefied carbon dioxide gas, how to use a small amount of liquefied carbon dioxide gas and to reduce temperature unevenness depending on the location to reduce the freezing time. Although shortening is an important issue, in the case of the conventional quick freeze device shown in FIG. 7,
Since the liquefied carbon dioxide is jetted only from the upper part of the freezer 1, it is difficult for the liquefied carbon dioxide to spread to the lower freezing shelf 2, resulting in a large temperature unevenness, and especially when intermittent jetting is performed, all stages of liquefied carbon dioxide are covered. It takes time for the frozen material 5 to freeze, and eventually the consumption amount of liquefied carbon dioxide gas is not reduced. Further, in the case of the quick freezing device shown in FIG. 8, since the liquefied carbon dioxide gas is jetted from the jet port 4 arranged for each freezing shelf,
It is possible to freeze without temperature unevenness in the upper and lower parts, but when attempting intermittent ejection to reduce the consumption of liquefied carbon dioxide, the ejection port 4 provided in the conduit 3 is clogged from below due to the adhesion of dry ice. , It becomes impossible to eject liquefied carbon dioxide. Therefore, the amount of liquefied carbon dioxide gas consumed cannot be reduced because the gas can only be ejected continuously.

The present invention is intended to solve such a problem. Liquefied carbon dioxide gas can be ejected intermittently, and temperature unevenness can be eliminated to shorten the freezing time. It is an object of the present invention to provide a quick freezing device that can reduce the amount of consumption.

[0009]

The quick freezing device according to the present invention has a plurality of upper and lower freezing shelves for placing an object to be frozen in a freezer which has been subjected to a heat insulating treatment, and is provided with a conduit from the outside. Liquefied carbon dioxide gas is introduced, and the liquefied carbon dioxide gas is jetted into the freezer from the jet port provided in the conduit,
In the quick freezing device for rapidly freezing the frozen material stored in the freezer by utilizing the vaporization heat of the jetted liquefied carbon dioxide and the sublimation heat of the dry ice produced from the jetted liquefied carbon dioxide, It is characterized in that it is branched into a plurality of independent thin conduits corresponding to the upper and lower freezing shelves, and that each of the thin conduits is provided with one jet outlet at its tip end.

Further, the quick freezing device of the present invention may be used in combination with a refrigerator, and in that case, the structure is provided with a freezer with heat insulation treatment and a refrigerator for cooling this freezer. , Arranging freezing shelves for placing frozen objects in the freezer in a plurality of upper and lower stages, and introducing liquefied carbon dioxide gas from the outside through a conduit, and discharging the liquefied carbon dioxide gas from the jet port provided in the conduit. It was ejected into the freezer, and the heat of vaporization of the ejected liquefied carbon dioxide and the heat of sublimation of dry ice produced from the ejected liquefied carbon dioxide were used, and the refrigerator was used in combination to store it in the freezer. In a quick freezing device for rapidly freezing a frozen material, the conduit is branched into a plurality of independent thin pipes corresponding to upper and lower freezing shelves, and one jet outlet is provided at each tip of the thin pipes. Is characterized by.

Preferably, the freezing shelves on which the objects to be frozen are placed are arranged in a plurality of stages in the freezer, and the thin conduits are provided so that the liquefied carbon dioxide gas can be independently ejected to the freezing shelves at each stage. To place.

[0012] Preferably, the conduit is connected to a liquefied carbon dioxide gas cylinder through an electromagnetic valve controllable to intermittently eject liquefied carbon dioxide gas.

Further, each thin conduit is preferably branched from the conduit via a header.

The present invention also relates to a multi-stage freezing shelf with one unit.
The thin conduits may be arranged in two groups so that the liquefied carbon dioxide gas can be jetted alternately from the opposite side for each stage.

When divided into two groups as described above, it is preferable that each thin conduit is branched from the conduit through a header for each group.

Further, according to the present invention, the freezing shelves on which the objects to be frozen are placed are arranged in a plurality of stages in the freezer, and the freezing shelves of the respective stages are sandwiched between the freezing shelves and are independent from the positions on both sides. The thin conduits may be arranged so that the liquefied carbon dioxide gas can be ejected. In addition, the present invention arranges freeze shelves on which frozen objects are placed in a plurality of stages in a freezer, and separates the liquefied carbon dioxide gas from each of the plurality of positions surrounding the respective freeze shelves with respect to the respective freeze shelves. The thin conduits may be arranged so as to eject.

As described above, thin pipes are arranged for freezing shelves at each stage so that the liquefied carbon dioxide gas can be jetted independently from the positions on both sides of the freezing shelves, or a plurality of surrounding freezing shelves can be provided. When the thin pipes are arranged so as to eject the liquefied carbon dioxide gas independently from the positions of the above positions, the pipes are preferably connected to the liquefied carbon dioxide gas cylinder through a controllable electromagnetic valve for intermittently jetting the liquefied carbon dioxide gas. .

Also in this case, each thin conduit is preferably branched from the conduit through a header.

Further, in the case where the thin pipes are arranged so as to eject the liquefied carbon dioxide gas independently from the positions on both sides of the freezing shelves at each stage, the thin pipes are provided on both sides of the freezing shelves. It is preferable that the pipes are branched and branched from independent pipes, and the pipes are connected to a liquefied carbon dioxide cylinder through an electromagnetic valve controllable so that the liquefied carbon dioxide is alternately and intermittently ejected.

Further, when the thin conduits are arranged so that the liquefied carbon dioxide gas can be ejected independently from a plurality of positions surrounding each freezing shelf, each thin conduit is divided at least on both sides of the freezing shelf from independent conduits. It is preferable that the pipes are branched and each of the conduits is independently connected to the liquefied carbon dioxide gas cylinder through an electromagnetic valve that can be controlled to alternately and intermittently inject the liquefied carbon dioxide gas.

[0021]

According to the quick-freezing device according to the first aspect of the present invention, the freezing shelves for placing the objects to be frozen are arranged in a plurality of upper and lower stages in the freezer that has been subjected to the heat insulation treatment, and the conduit is externally provided. Liquefied carbon dioxide gas was introduced through this, and this liquefied carbon dioxide gas was ejected from the ejection port provided in the above-mentioned conduit into the freezer, and the ejected liquefied carbon dioxide gas took heat of vaporization and was generated from the ejected liquefied carbon dioxide gas. Since the dry ice absorbs the heat of sublimation, the frozen material stored in the freezer is rapidly frozen. Further, in particular, the pipe is branched into a plurality of independent thin pipes corresponding to the upper and lower freezing shelves, and each of the thin pipes has one jet outlet at the tip end thereof. Things are frozen evenly in temperature, and moreover,
Since each thin pipe is independent and a certain pressure is applied to each thin pipe at the time of jetting, even if intermittent jetting is performed, dry ice adhering to the jet outlet of the thin pipe is pushed out at each jet, , Neither spout is blocked. As a result, it is possible to perform quick freezing without temperature unevenness while reducing the consumption of liquefied carbon dioxide gas by intermittent ejection of liquefied carbon dioxide gas.

Further, according to the quick freezing apparatus of the second aspect of the present invention, by using the refrigerator together, the liquefied carbon dioxide gas is agitated by the fan for the evaporator installed in the refrigerator to remove the latent heat of vaporization. It is possible to accelerate the freezing action of liquefied carbon dioxide, and, for example, it is possible to put a substance to be frozen in a refrigerator previously cooled to a certain temperature in a refrigerator and to eject liquefied carbon dioxide. More efficient rapid freezing becomes possible.

According to the third aspect of the present invention, the freezing shelves on which the objects to be frozen are placed are arranged in a plurality of stages in the freezer.
Since the liquefied carbon dioxide gas is independently ejected to the freezing shelves at each of the stages, quick freezing without temperature unevenness is facilitated.

According to the fourth aspect of the present invention, the conduit is connected to the liquefied carbon dioxide gas cylinder through an electromagnetic valve that can be controlled to intermittently eject the liquefied carbon dioxide gas, so that the liquefied carbon dioxide gas is interrupted. Ejection becomes easy.

Further, according to the structure of claim 5, each thin conduit branches from the conduit through the header, so that the branch structure is simplified, and the direction of the ejection port can be easily changed. It is easy to find the optimum condition.

According to the structure of claim 6, the thin conduits are arranged in two groups so that the liquefied carbon dioxide gas can be jetted alternately from the opposite side to each of the plurality of stages of freezing shelves. As a result, alternate jetting is possible and uniform freezing is easily obtained.

According to the structure of claim 7, the thin conduits are arranged in two groups so that the liquefied carbon dioxide gas can be jetted alternately from the opposite side for each of the plurality of stages of freezing shelves. In this case, since each thin conduit is branched from the conduit through the header for each group, the branch structure is simplified, and the direction of the jet outlet can be easily changed, and the optimum condition can be easily searched. .

According to the eighth aspect of the present invention, the thin pipes are arranged so that the liquefied carbon dioxide gas can be ejected independently from the positions on both sides of the freezing shelves of the respective stages sandwiching the respective freezing shelves. This enables uniform freezing even if the freezer is large.

According to a ninth aspect of the present invention, the thin conduits are arranged so that the liquefied carbon dioxide gas can be ejected independently from a plurality of positions surrounding each of the freezing shelves to each of the freezing shelves. This allows uniform freezing even when the freezer is larger.

Further, according to the structure of claim 10, the conduit is connected to the liquefied carbon dioxide gas cylinder through an electromagnetic valve that can be controlled to intermittently inject the liquefied carbon dioxide gas, so that the liquefied carbon dioxide gas is interrupted. Ejection becomes easy.

According to the eleventh aspect of the invention, since each thin conduit branches from the conduit through the header, the branch structure is simplified, and the direction of the ejection port can be easily changed. It is easy to find the optimum condition.

According to the twelfth aspect of the present invention, each of the thin conduits is divided into two sides of the freezing shelf and branched from each independent conduit, and each conduit independently and alternately ejects the liquefied carbon dioxide gas intermittently. By connecting to the liquefied carbon dioxide gas cylinder through the electromagnetic valve that can be controlled so that the liquefied carbon dioxide gas can be intermittently ejected.

According to the thirteenth aspect of the present invention, each of the thin pipes is divided into at least both sides of the freezing shelf and branched from each independent pipe, and each pipe independently and alternately interrupts the liquefied carbon dioxide gas. By connecting to a liquefied carbon dioxide cylinder via an electromagnetic valve that can be controlled to inject,
After all, intermittent ejection of liquefied carbon dioxide becomes easy.

[0034]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a rapid freezing device according to an embodiment of the present invention. The quick freezing device of this embodiment is
Inside a freezer 1 that has been subjected to heat insulation processing, a plurality of upper and lower freezing shelves 2 are provided. A conduit 3 for introducing liquid carbon dioxide is arranged on the upper side of the freezer 1, and the conduit 3 is divided into the same number of thin conduits 3A as the number of freezing shelves 2 via a header 6. There is. These thin conduits 3A are attached to each freezing shelf 2
The freezer 1 extends downward from the header 6 to the upper position of each freezing shelf 2, and the lower end side is placed on the freezing shelf 2 of each stage. Bent to eject liquid carbon gas toward the frozen object 5,
The tip portion has a structure in which one ejection port 4 is provided. The conduit 3 is connected to a liquid carbon dioxide gas cylinder 8 via an on / off type electromagnetic valve 7.
Further, inside the freezer 1, an evaporator 9 is arranged on the side opposite to the thin conduit 3A, and a fan 10 is arranged on the back of the evaporator 9. The evaporator 9 is connected to the external refrigerator 11. Note that the thin conduits 3A do not necessarily have to correspond to the freezing shelves 2 on a one-to-one basis, and may be arranged, for example, at every other stage with respect to a plurality of freezing shelves 2.

In the apparatus of this embodiment, each freezing shelf 2
The object to be frozen 5 is placed on the freezer 1 and the refrigerator 11 is operated to operate the freezer 1.
After cooling the inside to a constant temperature in advance, the electromagnetic valve 7 is opened to introduce the liquefied carbon dioxide gas, and the liquefied carbon dioxide gas is ejected from the ejection port 4 of each thin conduit 3A toward the frozen object 5 of each freezing shelf 2. Then, in the continuous ejection mode, the electromagnetic valve 7 is fixed to be on, and in the intermittent ejection mode, the electromagnetic valve 7 is on / off controlled in a predetermined mode.

FIG. 2 is a schematic configuration diagram showing a rapid freezing device according to another embodiment of the present invention. In the apparatus of this embodiment, the conduit 3 arranged in the center of the upper part of the freezer 1 is branched so that the liquefied carbon gas is jetted from the opposite side alternately to the freezing shelves 2 having a plurality of stages. It is guided to the left and right sides of the freezing shelf 2, and a plurality of thin conduits 3 are provided on each side via headers 6.
The configuration is branched to A. Other configurations are the same as the example shown in FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

FIG. 3 is a schematic block diagram showing a quick-freezing device according to still another embodiment of the present invention. The device of this embodiment is
This is suitable for the case where the freezer 1 is relatively large, and the conduit 3 is divided into both sides so that the liquid carbon dioxide gas is ejected from both sides to the freezing shelves 2 of each stage, and each independent electromagnetic valve ( It is connected to a liquefied carbon dioxide gas cylinder (not shown) via a (not shown), and the conduit 3 is branched via a header 6 into a plurality of thin conduits 3A on each side. Other configurations are the same as the example shown in FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In the case of this embodiment, when performing intermittent ejection,
It is easier to obtain uniform freezing when ejected alternately instead of ejecting from the left and right simultaneously.

FIG. 4 is a schematic block diagram showing a quick-freezing device according to still another embodiment of the present invention. The device of this embodiment is
The freezer 1 is suitable for a larger size, and the thin conduit pipe 3A is branched into four directions so that the liquid carbon dioxide gas is ejected from four places surrounding the freezing rack 2 at each stage. Four
It is possible to inject intermittently from the narrow conduits 3A of each group by using an independent electromagnetic valve (not shown) at different times. Other configurations are the same as the example shown in FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals.

In each of these embodiments, a refrigerator is used in combination, but it is also possible to perform rapid freezing only by jetting liquefied carbon dioxide without providing a refrigerator.

FIG. 5 shows a thin conduit 3 common to the above embodiments.
It is the longitudinal cross-sectional view (a) and transverse cross-sectional view (b) which show the branch structure of A, (b) is the BB of (a) in the same figure.
It is a cross section. Each thin conduit 3A is, for example, a copper pipe having a diameter of 3 mm, and its upper end surface is chamfered so that liquid carbon dioxide gas can smoothly flow thereinto.

FIG. 6 shows a case where the embodiment of FIG. 1 is applied to a device having 15 freezing shelves, when only the refrigerator is operated, and intermittent ejection with an on time of 1 second and an off time of 10 seconds. It is the data showing the transition of the temperature inside the refrigerator by comparing the case of (combined with a refrigerator) and the case of intermittent jetting with an on time of 1 second and an off time of 5 seconds (combined with a refrigerator). As is clear from this data, the rapid evacuation is possible by intermittent ejection.

[0044]

Since the present invention is constituted as described above, according to the quick freezing device of the first aspect, the conduit is branched into a plurality of independent thin conduits corresponding to the upper and lower freezing shelves, and By providing one jet outlet at each tip of the thin conduit, the upper and lower frozen objects can be frozen without temperature unevenness, and the jetted liquefied carbon dioxide gas can be intermittently jetted without clogging the jet outlet. Therefore, quick freezing with reduced consumption of liquefied carbon dioxide can be performed.

Further, according to the quick freezing device of the second aspect, it is possible to perform the quick freezing more efficiently by using the refrigerator together.

According to the third aspect of the present invention, the liquefied carbon dioxide gas is independently ejected to each of the freezing shelves arranged in a plurality of stages, so that quick freezing without temperature unevenness can be easily performed. it can.

Further, according to the structure of the fourth aspect, the intermittent injection of the liquefied carbon dioxide can be easily performed by controlling the electromagnetic valve.

Further, according to the structure of claim 5, the branch structure can be simplified by branching each thin conduit from the conduit through the header, and the direction of the ejection port can be changed. The optimum conditions can be easily searched for.

According to the sixth aspect of the present invention, it is possible to easily obtain uniform freezing by ejecting the liquefied carbon dioxide gas from the opposite side alternately for each stage with respect to a plurality of stages of freezing shelves. .

Further, according to the structure of claim 7, the branching structure of the thin pipe for ejecting the liquefied carbon dioxide gas from the opposite side alternately to each of the plurality of stages of freezing shelves is simplified. Moreover, the optimum condition can be easily searched by changing the direction of the ejection port.

According to the eighth aspect of the present invention, the thin conduits are arranged so that the liquefied carbon dioxide gas can be ejected independently from the positions on both sides of the freezing shelves of the respective stages with the freezing shelves interposed therebetween. This allows uniform freezing even if the freezer is large.

Further, according to the ninth aspect of the present invention, by arranging the fine conduits so that the liquefied carbon dioxide gas can be ejected independently from the plurality of positions surrounding the respective freezing shelves with respect to the respective freezing shelves. Even if the freezer is larger, uniform freezing can be performed.

Further, according to the structure of claim 10, the conduit is connected to the liquefied carbon dioxide gas cylinder through the electromagnetic valve which can be controlled to intermittently liquefy the liquefied carbon dioxide gas, so that the intermittent ejection of the liquefied carbon dioxide gas is performed. It can be easy.

According to the eleventh aspect of the invention, by branching each thin conduit from the conduit via the header, the branch structure can be simplified, and the direction of the ejection port can be changed. The optimum conditions can be easily searched for.

According to the twelfth aspect of the present invention, each of the thin pipes is divided into both sides of the freezing shelf and branched from the independent pipes, and the respective pipes are independently and alternately ejected liquefied carbon dioxide gas intermittently. By connecting to the liquefied carbon dioxide gas cylinder through such a controllable electromagnetic valve, intermittent ejection of liquefied carbon dioxide gas can be facilitated.

According to the thirteenth aspect of the present invention, each of the thin pipes is divided into at least both sides of the freezing rack and branched from each independent pipe, and each pipe is independently and alternately injected intermittently into the liquefied carbon dioxide gas. The intermittent ejection of the liquefied carbon dioxide can be facilitated by connecting to the liquefied carbon dioxide cylinder through the electromagnetic valve that can be controlled so that the liquefied carbon dioxide can be ejected.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a vertical section of a quick-freezing device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a vertical section of a quick-freezing device according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a vertical cross section of a quick-freezing device according to still another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a cross section of a quick-freezing device according to still another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a branched structure of a thin conduit common to each embodiment of the present invention.

6 is a graph of experimental data relating to the example of FIG.

[Explanation of symbols]

 1 Freezer 2 Freezing Shelf 3 Conduit 3A Fine Conduit 4 Jet Port 5 Freeze Target 6 Header 7 Electromagnetic Valve 8 Liquefied Carbon Dioxide Cylinder 9 Evaporator 10 Fan 11 Refrigerator

[Procedure amendment]

[Submission date] September 20, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a vertical section of a quick-freezing device according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a vertical section of a quick-freezing device according to another embodiment of the present invention.

FIG. 3 is a schematic configuration diagram showing a vertical cross section of a quick-freezing device according to still another embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing a cross section of a quick-freezing device according to still another embodiment of the present invention.

FIG. 5 is a cross-sectional view showing a branched structure of a thin conduit common to each embodiment of the present invention.

6 is a graph of experimental data relating to the example of FIG.

FIG. 7 is a schematic configuration diagram showing a vertical section of a conventional quick-freezing device.

FIG. 8 is a schematic configuration diagram showing a vertical section of a conventional quick-freezing device.

[Explanation of reference symbols] 1 freezer 2 freezing shelf 3 conduit 3A thin conduit 4 jet outlet 5 frozen object 6 header 7 electromagnetic valve 8 liquefied carbon dioxide cylinder 9 evaporator 10 fan 11 refrigerator

Claims (13)

[Claims] 1. A freeze shelf for placing an object to be frozen is arranged in a plurality of upper and lower stages in a freeze store subjected to heat insulation treatment, and liquefied carbon dioxide gas is introduced from the outside through a conduit, and the liquefied carbon dioxide gas is supplied. It was ejected from the ejection port provided in the conduit into the freezer and was stored in the freezer by utilizing the heat of vaporization of the ejected liquefied carbon dioxide and the heat of sublimation of dry ice generated from the ejected liquefied carbon dioxide. In a rapid freezing device for rapidly freezing an object to be frozen, the pipe is branched into a plurality of independent thin pipes toward a desired freezing shelf, and one jet outlet is provided at each tip of the thin pipes. Rapid freezing device characterized by. 2. A freeze store provided with a heat insulation treatment and a freezer for cooling the freeze store. Freezing shelves for placing an object to be frozen in the freeze store are arranged in a plurality of upper and lower stages, and from the outside. Liquefied carbon dioxide gas was introduced through a conduit, and the liquefied carbon dioxide gas was ejected into the freezer from the ejection port provided in the conduit, and was generated from the heat of vaporization of the ejected liquefied carbon dioxide and the ejected liquefied carbon dioxide gas. In a quick freezing device that uses the sublimation heat of dry ice and rapidly freezes the frozen object stored in the freezer by using the freezer together, a plurality of independent pipes are provided with the conduit directed toward a desired freezing shelf. The rapid freezing device is characterized in that each of the thin conduits is branched, and each of the thin conduits is provided with one ejection port at the tip thereof. 3. The rapid freezing device according to claim 1, wherein the thin pipes are arranged so that the liquefied carbon dioxide gas can be independently ejected to the freezing shelves of each stage. 4. The quick freezing device according to claim 1, wherein the conduit is connected to a liquefied carbon dioxide cylinder through an electromagnetic valve that can be controlled to intermittently eject liquefied carbon dioxide. 5. The quick freeze device according to claim 1, wherein each thin conduit is branched from the conduit via a header. 6. The quick freezing device according to claim 3, wherein the thin conduits are arranged in two groups so that the liquefied carbon dioxide gas can be jetted alternately from the opposite side of each of the plural stages of freezing shelves. 7. The quick freezing device according to claim 6, wherein each thin conduit is branched from the conduit through a header for each group. 8. The rapid freezing device according to claim 1 or 2, wherein the thin pipes are arranged so that the liquefied carbon dioxide gas can be independently ejected from positions on both sides of the freezing shelves sandwiching the respective freezing shelves. 9. The rapid freezing device according to claim 1 or 2, wherein the thin conduits are arranged so that the liquefied carbon dioxide gas can be ejected independently from a plurality of positions surrounding each freezing shelf with respect to each freezing shelf. 10. The quick freezing device according to claim 8, wherein the conduit is connected to a liquefied carbon dioxide cylinder through an electromagnetic valve that can be controlled to intermittently inject liquefied carbon dioxide. 11. The quick freezing device according to claim 8, wherein each thin conduit is branched from the conduit via a header. 12. Each thin conduit is divided into both sides of the freezing shelf and branched from each independent conduit, and each conduit is independently controlled through an electromagnetic valve controllable to intermittently eject liquefied carbon dioxide gas. The quick freezing device according to claim 8, which is connected to a liquefied carbon dioxide gas cylinder. 13. Each thin conduit is branched at least on both sides of the freezing shelf from an independent conduit, and each conduit is independently controlled by an electromagnetic valve controllable to intermittently inject liquefied carbon dioxide gas alternately. The quick freezing device according to claim 9, which is connected to a liquefied carbon dioxide gas cylinder.