JPH10306964A - Handy cool box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep the temperature within an icebox constant without power source for a long time, by performing the control of inflow into the icebox of the chill of dry ice, using, especially, shape memory alloy, in a handy cool box. SOLUTION: A handy cool box 1 which keeps the temperature within an icebox constant is equipped with a refrigerant storage 4 which accommodates dry ice in the upper part within the icebox, an opening and closing mechanism 9 which connects and breaks the inside of the icebox 8 and the refrigerant storage 4, elastic material 11 made of shape memory alloy which detects the temperature inside the icebox 8 and lets the chill of the dry ice flow in the icebox 8 from the refrigerant storage 4 through the opening and closing mechanism 9 when the inside of the icebox 8 comes to a preset temperature T1 or under, and elastic material 12 which breaks the inflow of the chill of dry ice from the refrigerant storage 4 into the icebox 8 through the opening and closing mechanism 9 when the inside of the icebox 8 comes to the preset temperature T2 (T2<T1) or under, and this keeps the temperature within the icebox 8 constant. This handy cool box is equipped with a mechanism which prevents the freezing or frosting to the opening and closing mechanism 9, with the first blowoff port of the opening and closing mechanism 9 of the refrigerant storage 4 to accommodate dry ice and the second blowoff port of the chill inside the ice box provided provided separately slid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses a handy cool box, particularly a shape memory alloy spring, to control the flow of dry ice cool air into a refrigerator so that the temperature inside the refrigerator is kept constant for a long time without power supply. It is about the handy cool box that was done.

[0002]

2. Description of the Related Art Handy cool boxes are widely used for fishing in summer and outdoor leisure. They are,
As the refrigerant, a gel-like substance that has been previously frozen in a freezer or ice is used. Occasionally, dry ice is used as a refrigerant.

[0003]

However, the frozen gel-like substance has a drawback that it has a low cooling capacity and does not have cold air in the summer for half a day, and the duration of the cool air is too short for practical use.

[0004] When ice is used as a refrigerant, the ability to store cold air is higher than that of a gel-type refrigerant, but there is a drawback that ice melts and water accumulates in the refrigerator, so that those that dislike water cannot be added. .

Dry ice has a low temperature of -78 ° C.
When using dry ice, the fish and drinks in the refrigerator may freeze because they are too cold, and the temperature inside the refrigerator is extremely low. There was a drawback that could not be done.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks, and to provide a handy cool box capable of keeping the inside of a refrigerator at an appropriate temperature for a long time without storing water in the refrigerator. And

[0007]

Means for Solving the Problems In order to solve the above-mentioned object, a handy cool box of the present invention is a handy cool box for keeping a temperature in a refrigerator constant, comprising: a refrigerant reservoir for storing dry ice; An opening / closing mechanism for connecting and shutting off the refrigerator and a temperature inside the refrigerator are detected, and when the temperature in the refrigerator becomes equal to or higher than a predetermined temperature T1, cool air of dry ice flows from the refrigerant refrigerator into the refrigerator through the opening / closing mechanism. A shape memory alloy, and an elastic material for blocking cold air inflow of dry ice from the refrigerant chamber into the chamber via the opening / closing mechanism when the inside of the chamber becomes equal to or lower than a predetermined temperature T2 (T2 <T1), It is characterized by keeping the temperature inside the refrigerator constant. Japanese Patent Application No. 7-282675 and Japanese Patent Application No. 9-3692
No. does not mention the location of the refrigerant compartment in the handy cool box, but when measuring a large number of data of the temperature distribution in the compartment, it is remarkable to keep the temperature distribution in the refrigerator constant at the position of the refrigerant compartment in the handy cool box. It turned out that there was a difference. That is, when the refrigerant storage is installed on the inner side surface, the temperature distribution in the storage has a difference of 8 ° C. or more between the upper part and the lower part in the storage, and the temperature distribution in the storage is not uniform. In order to make the temperature distribution in the chamber uniform, a solar battery is stuck on the surface of the upper lid of the Handy Cool Box, and the electromotive force turns a solar fan in the chamber to agitate the air in the chamber or a copper plate with good heat conduction. Was made into a U-shape to try to improve the temperature distribution in the refrigerator by transmitting cold air at the bottom to the top. The effect of stirring the air in the refrigerator by rotating the solar fan in the refrigerator has been confirmed, but the effect cannot be expected if a sufficient light source cannot be obtained in the solar battery. Also, a sufficient effect was not obtained even with a copper plate utilizing heat conduction. In each case, there is a problem in economy and durability. The present invention is characterized in that the internal temperature is kept constant and uniform.

[0008] Dry ice has a low temperature of -78 ° C, has a latent heat of sublimation about twice that of ice, and has a specific gravity of 1.56, which takes up less space than other refrigerants. The opening / closing mechanism is opened and closed to control the flow of dry ice cool air into the refrigerator, and the temperature in the refrigerator is kept substantially constant.

[0009]

FIG. 1 is an explanatory view of the basic structure of the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1 and 2, a cool box 1 includes a main body 2 which has been conventionally used as a heat storage box, a lid 3 which can be freely opened and closed, and is further formed of a heat insulating material which is housed in the main body 2 so as to be freely taken out. And a dry ice storage 4. The dry ice storage 4 includes a dry ice storage main body 5 and a closed lid 6.
The structure is such that the dry ice 7 packed in the container does not rapidly sublime.

An opening / closing mechanism 9 for communicating or shutting off the dry ice storage main body 5 for storing the dry ice 7 and the inside 8 of the refrigerator is provided on the inside of the dry ice storage main body 5 inside the refrigerator. That is, a cool air outlet 10 is formed in the dry ice storage main body 5, and a shape memory alloy spring 11 is provided.
Opening / closing plate 13 which is opened and closed by elastic material 12 such as a spring
Thus, the flow of the cold air of the dry ice 7 into and out of the refrigerator 8 through the outlet 10 is controlled.

That is, when the temperature of the interior 8 rises and the temperature of the interior 8 becomes equal to or higher than T1, the shape memory alloy spring 11 changes to a predetermined shape. This shape memory alloy spring 1
1 causes the opening and closing plate 13 to open as shown in FIG. 1 against the elastic force of the elastic member 12 such as a spring, and the cool air of the dry ice 7 passes through the outlet 10 from the dry ice storage 4 side. When the temperature of the inside 8 falls to T2 or less, the shape memory alloy spring 11 which detects the temperature of the inside 8 loses strong spring property, The elastic force of the elastic material 12 such as a spring causes the opening and closing plate 13 to close. Thereby, the inflow of the cool air of the dry ice 7 into the refrigerator 8 is blocked. By this repetition, the temperature of the interior 8 is kept constant.

Note that the opening / closing mechanism 9 shown in FIG. 1 shows a principle configuration, and a structure in which the opening / closing mechanism 9 does not protrude toward the inside of the refrigerator 8 will be described with reference to FIG. Here, the outline of the shape memory alloy spring 11 will be described.
1 exhibits a shape memory effect by performing a heat treatment with a Ni-Ti alloy. The shape memory effect means that when a shape is memorized at a predetermined temperature (austenite phase), if it is deformed at a temperature lower than the shape recovery temperature (martensite phase), it is restored to its original shape when heated to the shape recovery temperature. It is the characteristic of returning. The shape recovery temperature varies depending on the components, processing conditions and heat treatment conditions, and various temperatures are manufactured.

In the experiment of the present application, a shape memory alloy spring 11 having a shape recovery temperature of 10 ° C. was used, 10 kg of fish at 25 ° C. was put in a cool box 1 having an internal volume of 26 liters, and 10 kg of dry ice 7 3 days at 9 ℃
Could be kept.

FIG. 3 is an explanatory view of an embodiment of the opening / closing mechanism. FIG. 1A shows a state where the opening and closing mechanism 9 is closed, and FIG. 2B shows a state where the opening and closing mechanism 9 is opened.

In (1) and (2) of FIG. 1, each edge of the base plate 15 provided at the cool air outlet 10 of the dry ice storage main body 5 has an appropriate height in the forward direction from the paper surface. In addition, a window 16 is provided as shown by a dotted line, and two L-shaped stoppers 17 and 18 are fixed on the base plate 15. At this time, the cool air outlet 10 of the dry ice storage main body 5 is formed in the shape of the window 16. Guide plates 19 and 20 are mounted on the base plate 15. A slide plate 26 fitted to the two guide plates 19 and 20 is slidably mounted, and both ends of the slide plate 26 are provided with grooved rising portions 21 and 22. A shape memory alloy spring 23 is attached to the groove of the rising portion 21, and a torsion spring 24 is attached to the groove of the rising portion 22. A portion where the shape memory alloy spring 23 contacts the rising portion 21 of the slide plate 26 and a portion which contacts the bent portion of the base plate 15 are:
Although not shown, a heat insulating tube is covered so as to block heat conduction from the slide plate 26 and the base plate 15. A window 25 is formed in the slide plate 26 so as to correspond to the window 16.

The temperature of the interior 8 rises, and the temperature of the interior 8 becomes T
When it becomes 1 or more, the shape memory alloy spring 23 that detects the temperature of the inside 8 of the refrigerator changes to the original shape that has been processed in advance. The shape change of the shape memory alloy spring 23 has a strong spring property and resists the elastic force of the torsion spring 24 as shown in FIG.
The slide plate 26 is moved from right to left in the drawing to a position where the rising portion 22 contacts the stopper 18. Thereby, the window 16 of the base plate 15 and the window 25 of the slide plate 26 overlap, and the opening / closing mechanism 9 is opened. The cool air of the dry ice 7 flows from the side of the dry ice storage 4 through the outlet 10, flows into the inside 8 of the refrigerator through the overlapping windows 16 and 25, and lowers the temperature of the inside 8. At this time, the cool air flowing into the inside of the refrigerator 8 is prevented from directly falling on the shape memory alloy spring 23 by the rising portion 21 of the slide plate 26.

[0017] The temperature of the interior 8 drops, and the temperature of the interior 8 becomes T
When it becomes 2 or less, the shape memory alloy spring 23 loses strong spring property, and the elastic force of the torsion spring 24 causes
As shown in FIG. 3A, the slide plate 2 is moved to a position where the rising portion 21 of the slide plate 26 contacts the stopper 17.
6 is moved from left to right in the drawing. As a result, the window 16 of the base plate 15 is displaced from the window 25 of the slide plate 26, and the opening / closing mechanism 9 is closed.

As described above, the cool air flowing from the outlet 10 to the inside 8 of the cool box 1 is controlled by the opening / closing mechanism 9 in accordance with the temperature of the inside 8 of the cool box 1, and the temperature of the inside 8 of the cool box is kept constant.

FIG. 4 shows another embodiment of the opening / closing mechanism shown in FIG. (1) of the drawing shows an overall view of the opening / closing mechanism 9, (2) of the same figure shows an overall view of the closed state of the opening / closing mechanism 9 including a partial cross-sectional view, and (3) of the same figure shows a torsion spring. 2 shows the structure of a boss for stopping the like.

In FIG. 2B, guide plates 19 and 20 are mounted on the base plate 15. A slide plate 26 fitted to the two guide plates 19 and 20 is slidably attached. A window 25 is formed in the slide plate 26 so as to penetrate the window 16 of the base plate 15 when the temperature of the inside 8 becomes equal to or higher than T1. At the left end of the slide plate 26, a boss 27 shown in FIG. 3C is rotatably mounted, and a hole 28 for inserting the torsion spring 24 is formed therethrough. At the right end of the slide plate 26, a boss 27 shown in FIG.
The connecting rod 28 is inserted into the position 8. At the left end of the base plate 15, a boss 27 shown in (3) of FIG. 1 is rotatably attached, and the other end of the torsion spring 24 is inserted. At the right end of the base plate 15, there is a hole 30 through which the connecting rod 29 passes. The other end of the connecting rod 29 is inserted and fixed to the slider 31. The slider 31 is slidably held by a bearing 32.
The other end has a U-shaped groove and is pressed by a shape memory alloy spring 23. The shape memory alloy spring 23 is elastically stopped by a stud 33 having an outer diameter smaller than the inner diameter of the center ring of the shape memory alloy spring 23 so that the center ring does not move. The other end of the shape memory alloy spring 23 is stopped by a boss 27 shown in FIG. The base plate 15, the bearing 32, the stud 33, and the boss 27 at the other end of the shape memory alloy spring 23 are fixed to an acrylic plate 34 to form the opening / closing mechanism 9.

In order for the shape memory alloy spring 23 to easily detect the temperature of the inside 8 of the refrigerator, the right end of the acrylic plate 34
The individual through holes 35 are formed. The acrylic plate 34
There is a blow-off port 10 for cool air near the left end of the base plate 15, and a copper plate 36 having the same size as the base plate 15 is provided on the back surface of the acrylic plate 34. A similar cold air outlet 10 is formed in the copper plate 36 at a location corresponding to the cool air outlet 10 of the acrylic plate 34.

When the temperature of the cold storage 8 decreases, the relative humidity of the cold storage 8 rises, and to prevent ice and frost from adhering to the windows 16 and 25 to prevent normal sliding, the cold air is cooled. The outlet 10 is located at the position of the window 16 of the base plate 15.
It is provided so as to be shifted, and the moisture from the inside 8 is frozen on the copper plate 36 of the outlet 10 for the cool air. Therefore, the humidity from the inside 8 of the refrigerator is reduced to the windows 16 and 25.
Do not enter the sliding part of. The operation of the opening and closing mechanism 9 is basically the same as that of FIG. 3, the same components as those in FIG. 3 are denoted by the same reference numerals.

FIG. 5 is an explanatory view including a partial cross section of another embodiment of the dry ice storage 4 of FIG. In the same figure, the dry ice storage main body 5 and the lid 6 are made of a hard foam resin having low thermal conductivity and have a structure that can be disassembled by a band 37 with a snap lock. Can be easily inserted. The opening / closing mechanism 9 is attached to the dry ice storage body 5 with the cool air outlet 10 facing downward.

FIG. 6 is an explanatory cross-sectional view of another embodiment of the method of installing the dry ice storage 4 in the cooler box 1 shown in FIG. In the figure, the dry ice storage 4 is held above the cool box 1 by a dry ice storage cradle 38. In the figure, 5 is a dry ice storage main body, 6 is a lid, and 7 is dry ice. Cold air outlet 10 of opening / closing mechanism 9
Is disposed at the center of the upper part of the inside of the refrigerator 8, and the cool air from the cool air outlet 10 is discharged toward the lower part of the cool box 1. On the other hand, the warm air in the refrigerator 8 which has not yet reached the set temperature goes to the upper part of the cool box 1 and keeps the temperature of each part of the refrigerator 8 uniform by natural convection without forced convection by an electric fan or the like. I was able to.

FIG. 7 is an explanatory cross-sectional view of another embodiment of the method of installing the dry ice storage 4 in the cool box 1 shown in FIG. In the figure, the dry ice storage 4 is fixed with two snap-lock bands 39 attached to the lid 3 of the cool box 1 with the cold air outlet 10 facing the inside 8 of the storage. The opening / closing mechanism 9 is shown in FIG.
Since this is the same as the case of, the description thereof is omitted. Also,
In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals.

FIG. 8 is an explanatory cross-sectional view of another embodiment in which the dry ice storage 4 shown in FIG. 7 is disposed on the upper lid 3 of the cool box 1. In the figure, a lid 40 is provided on a part of the lid 3 to support the dry ice storage 4, and after the dry ice storage 4 is stored, one of the lids 42 is openably and closably attached with a hinge 41. , The crescent 43 and the packing 44 fix the dry ice storage 4. Since the opening / closing mechanism 9 is the same as that in FIG. 4, its description is omitted. In the same figure, the same components as those in FIG. 1 are denoted by the same reference numerals.

FIG. 9 is an explanatory view of an embodiment in which the dry ice storage 4 shown in FIG. 1 is disposed on the upper lid 3 of the cool box 1. FIG. 1A shows a means for providing a dry ice storage body 5 in a part of the lid 3, opening the lid 6 upward, and inserting the dry ice 7. (2) in FIG.
An opening / closing mechanism 9 is disposed on the inside 8 of the dry ice storage main body 5, and a cool air outlet 10 is provided from the upper portion of the inside 8.
The cool air from the dry ice storage 4 was discharged. Since the opening / closing mechanism 9 is the same as that in FIG. 4, its description is omitted. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals.

[0028]

As described above, according to the present invention, it is possible to maintain a constant temperature inside the refrigerator for a long time without power supply, without water remaining in the refrigerator. In addition, a second cold air outlet was provided by using a copper plate having good heat conductivity for a part of the opening / closing mechanism and shifting the cool air outlet.
As a result, it was possible to prevent ice and frost from adhering to the first cool air outlet of the opening and closing plate. Further, by disposing the dry ice storage in the upper part of the handy cool box, the temperature in the storage could be made uniform without using a device for forced convection. By installing a dry ice storage box with an opening and closing mechanism in a commercially available cool box, it becomes a versatile cool box that can be stored very easily for a long period of time, not only for general use but also for emergency use which is extremely effective in case of disaster It can also be used as a cool box.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a basic configuration according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory view of an embodiment of an opening / closing mechanism.

FIG. 4 is an explanatory view of another embodiment of the opening / closing mechanism.

FIG. 5 is an explanatory view of another embodiment of a dry ice storage.

FIG. 6 is an explanatory diagram of an example of arrangement in a cool box of a dry ice storage.

FIG. 7 is an explanatory view of another arrangement example in the cool box of the dry ice storage.

FIG. 8 is an explanatory view of another embodiment of the dry ice storage.

FIG. 9 is an explanatory view of another embodiment of a dry ice storage.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cool box 2 Main body 3 Lid 4 Dry ice storage 5 Dry ice storage 6 Lid 7 Dry ice 8 Inside 9 Opening / closing mechanism 10 Air outlet 11 Shape memory alloy spring 12 Elastic material 13 Opening / closing plate

 ──────────────────────────────────────────────────続 き Continuing from the front page (71) Applicant 597004801 Nitto Hakko Co., Ltd. 2-18-20 Komaoka, Tsurumi-ku, Yokohama, Kanagawa Prefecture (71) Applicant 595135132 Tomiyo Yamato, 1411-39, Kashio-cho, Totsuka-ku, Yokohama-shi, Kanagawa-ken Inventor Hidenori Murooka 29-1, Higashi-Terao, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Inside of Yokohama Metal Crafts Co., Ltd. 72) Inventor Yoshimitsu Onoe 2-18-20 Komaoka, Tsurumi-ku, Yokohama-shi, Kanagawa Prefecture Within Nitto Hatsujo Co., Ltd. (72) Inventor Tetsuo Yokoyama Kamiwa Yamato Willow 3-chome No. 13 No. 14 (72) inventor dong pungitius Kanagawa Prefecture, Totsuka-ku, Yokohama-shi Casio-cho, 1411 at address 39

Claims (3)

[Claims] 1. A handy cool box for keeping a temperature in a refrigerator constant, a refrigerant reservoir for storing dry ice in an upper portion of the refrigerator, an opening / closing mechanism for shutting off communication between the refrigerator and the refrigerant reservoir,
An elastic material made of a shape memory alloy for allowing cool air of dry ice to flow into the refrigerator from the refrigerant reservoir through the opening and closing mechanism when the temperature in the refrigerator is detected and the temperature in the refrigerator becomes equal to or higher than a predetermined temperature T1; An elastic material for blocking the inflow of cold air of dry ice from the refrigerant storage into the storage via the opening / closing mechanism when the temperature of the storage becomes equal to or lower than a predetermined temperature T2 (T2 <T1). Handy cool box characterized by keeping it. 2. An opening / closing mechanism comprising a fixed window and a slide plate capable of blocking the fixed window, wherein the elastic member made of a shape memory alloy and the elastic member act in opposite directions to the slide plate. The handy cool box according to claim 1, wherein the elasticity of the elastic material made of the alloy is set to be larger than the elasticity of the elastic material at the temperature T1 and smaller than the elasticity of the elastic material at the temperature T2. 3. A handy cool box for keeping a temperature in a refrigerator constant, wherein a first cool air outlet of an opening / closing mechanism of a refrigerant chamber for storing dry ice and a second cool air outlet provided inside the refrigerator are provided separately. A handy cool box equipped with a mechanism to prevent icing and frost on the opening and closing mechanism.