JP2009275317A - Cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device improving workability in a high temperature work section, and preventing frostbite of the body by a cooling material. <P>SOLUTION: This cooling device 1 has an attachment part 2 and a cooling part 3. The attachment part 2 can hold a dry ice 4 for cooling the body. The cooling part 3 has a mesh-like state, is at least arranged between the attachment part 2 and the body and on the lower side of the attachment part 2 to pass therethrough carbon dioxide cool air which occurs from the dry ice 4. Further, the cooling part 3 has a first mesh layer 5 and a second mesh layer 6. The first mesh layer 5 is placed on the body side and set alternately with a plurality of first opening areas 7. The second mesh layer 6 is placed on the opposite side of the body and has a plurality of second opening areas 8 which are alternately set. The plurality of second opening areas 8 are alternately disposed. The individual opening area of a plurality of the second opening areas 8 is larger than that of a plurality of the first opening areas 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cooling device for cooling a body.

  Conventionally, it can protect the health of workers who work in high-temperature adverse environments, such as rubber and resin molding press workplaces, near blast furnaces, near forging plants, and after heating metal and resin-based materials. A cooling device for cooling the body has been desired. Furthermore, this cooling device has been required to improve the workability of a worker in a high-temperature work place for as long as possible, that is, workability in a high-temperature work place.

  As a method for improving the workability of workers in a high-temperature work place, for example, clothing provided with air-conditioning means and heat-proof clothing have been proposed.

  For example, there is a garment including an air conditioning unit shown in FIG. 5 (Patent Document 1). The cooling / heating unit cools or heats liquid such as water, antifreeze, and oil in the heat transfer pipe 5 by the heat source 4. The liquid supplied with the heat in this way flows through the water supply pipe 9 and is sent to the vest 1 worn on the body. This liquid can cool or heat the body by flowing in the tube 2 of the vest 1. The liquid that has flowed through the tube 2 flows through the return water pipe 11 and returns to the housing 18 that is a heat source system. The liquid returned to the heat source system in this way is supplied with heat by the heat source 4 and sent to the body again. Thus, a heat medium circulation system is constructed. With this configuration, the worker's body can be cooled.

  However, the cooling / heating means disclosed in Patent Document 1 includes a water supply pipe 9 and a return water pipe 11 as means for transferring a heat medium. Accordingly, since the heat medium transfer means is interposed between the heat source and the worker, the work range of the worker is limited by this means.

On the other hand, for example, there is a heat-resistant garment shown in FIG. 6 (Patent Document 2). A cool storage agent 2 is provided as a coolant on the inner surface of the garment 1 of the heat-insulating garment. When this garment 1 is used, the cold storage agent 2 provided on the garment 1 in advance in a freezer is worn after the temperature is lowered. By wearing this garment, it is possible to prevent the body from becoming frostbite with air cooled by a cold storage agent having a cooling ability of a latent heat of fusion of 209 to 327 kJ / kg (50 to 78 kcal / kg). Furthermore, since the garment itself is provided with a coolant as a heat source, the workability of the worker is improved compared to the above-described embodiment having the heat medium transfer means.
JP 2003-113507 A Registered Utility Model No. 3035587

  However, in this heat insulating garment, a corresponding volume is required for the cold storage agent in order to maintain the cooling capacity of the cold storage agent for a long time. When the cooling garment such as a cool vest containing the bulky cold storage agent is housed in the wearing part, the work is difficult to move due to a sense of incongruity. For this reason, workability has deteriorated when working for a long time.

  This invention is made | formed in view of the said situation, and it aims at providing the cooling device which can improve workability | operativity in a high temperature work place, and can prevent the frostbite of the body by a coolant.

  The cooling device according to one aspect of the present invention includes a mounting unit that can store dry ice for cooling the body, and carbon dioxide cold air generated from dry ice at least between the mounting unit and the body and below the mounting unit. A mesh-shaped cooling unit that is passed through, the cooling unit being provided with a plurality of first opening regions alternately, the first mesh layer positioned on the body side, and the side opposite to the body A second mesh layer located on the second mesh layer, the second mesh layer being provided alternately, and having a plurality of second opening regions each having an opening area larger than each opening area of the plurality of first opening regions And a mesh layer.

  According to the present invention, by using dry ice (melting latent heat of 628 kJ / kg: 150 kcal / kg) having a higher cooling capacity than the regenerator as the coolant, the volume of the coolant required for the cooling device can be reduced. Thereby, when the worker wears clothes for body cooling using dry ice whose volume is reduced as compared with the regenerator, the uncomfortable feeling of incongruity is reduced. Therefore, the workability of workers can be improved.

  Furthermore, the present invention has the following effects. A part of the dry ice in the mounting portion that comes into contact with the outside air is sublimated by the outside air temperature, and becomes low-temperature carbon dioxide. The carbon dioxide diffuses to the surroundings, and part of the carbon dioxide enters the cooling unit from the second opening region of the second mesh layer of the mesh cooling unit disposed between the wearing unit and the body. Since carbon dioxide has a higher density than air, it flows downward in the cooling section along the direction of gravity. On the other hand, the air heated by the heat of the body diffuses to the surroundings, and a part of the air enters the cooling part from the first opening region of the first mesh layer of the cooling part. The air that has entered is at a temperature about the body temperature of the body, but is cooled by mixing with low-temperature carbon dioxide flowing in the direction of gravity. A part of the mixed carbon dioxide and air flows through the first opening region to the body side or through the second opening region to the dry ice side. At this time, the speed at which the mixed gas flowing along the direction of gravity flows into each opening region is constant. Therefore, the flow rate of the mixed gas flowing from the first opening region to the body side is such that the mixed gas flowing from the second opening region having an opening area larger than each of the first opening regions to the dry ice side. Smaller than flow rate. For forced convection heat transfer between fluid (mixed gas) and solid (body or dry ice) with respect to the relationship between flow and heat transfer, the heat transfer from fluid to solid is a positive power of the flow. Is proportional to Therefore, the heat transfer amount to the body of the mixed gas passing through the first opening region is smaller than the heat transfer amount to the dry ice of the mixed gas passing through the second opening region. Further, the mixed gas that has flowed in the cooling section in this way flows to the cooling section disposed below the mounting section and flows out to the outside air from the second opening region of the second mesh layer, so that heat is dissipated. The Therefore, frostbite of the body caused by low temperature carbon dioxide can be prevented by reducing excessive cooling of the body.

  Therefore, it is possible to provide a cooling device that can improve workability in a high-temperature work place and can prevent frostbite of the body due to the coolant.

  The best mode for carrying out the present invention will be described below with reference to the drawings. FIG. 1 shows a schematic diagram of a cooling device according to an embodiment of the present invention. The cooling device 1 has a mounting part 2 and a cooling part 3.

  A plurality of mounting parts 2 are provided, and each mounting part 2 can accommodate at least one dry ice 4 for cooling the body. Cooling required for the cooling device by using dry ice (melting latent heat 628 kJ / kg: 150 kcal / kg) having a higher cooling capacity than the cold storage agent (melting latent heat 209 to 327 kJ / kg: 50 to 78 kcal / kg) as a coolant. The volume of the material can be reduced. The dry ice 4 only needs to be accommodated in the mounting portion 2, and the shape and size thereof are not limited at all. Furthermore, the mounting portion 2 is provided at a position overlapping at least one of the back of the body's neck, the left chest, the right chest, the left shoulder blade, and the right shoulder blade (see FIGS. 1A and 1B). . Moreover, two mounting parts 2 are provided in parallel to the lower part of the cooling part 3 provided in front of the body, and are provided at a position corresponding to the stomach of the body (see FIG. 1A). However, the number is not limited to two, and a configuration in which the mounting portion 2 is not present at this location or a configuration in which one or more mounting portions 2 are provided is also possible. In addition, the cooling device 1 shown in FIG. 1 includes a total of seven mounting portions 2 on the front surface and the back surface. However, the number of the mounting portions 2 is not limited to seven. That is, in consideration of the fact that carbon dioxide, which is cold air generated from the dry ice 4, has a higher density than air and flows downward along the direction of gravity, at least one mounting portion 2 is disposed on the upper portion of the cooling device 1. Any form is acceptable.

  The cooling unit 3 has a mesh shape and is disposed at least between the mounting unit 2 and the body and below the mounting unit 2 (see FIGS. 1A and 1B). The cooling unit 3 is provided from the front to the back of the body. The cooling unit 3 disposed in front of the body is disposed between the mounting unit 2 positioned above and the mounting unit 2 positioned below. The cooling unit 3 disposed on the back of the body is disposed below the mounting unit 2. The length of the cooling unit 3 is a length that overlaps with the lower half or more of the back, and the width is equal to or less than the width of the back of the body. Further, the cooling unit 3 has a function of allowing carbon dioxide that has been sublimated to pass through a part of the dry ice 4 accommodated in the mounting unit 2 (see FIG. 1C). The cooling unit 3 has a two-layer structure of a first mesh layer 5 and a second mesh layer 6 (see FIG. 1D). The first mesh layer 5 is located on the body side and is provided with a plurality of first opening regions 7 alternately. The second mesh layer 6 is located on the side opposite to the body and has a plurality of second opening regions 8. The plurality of second opening regions 8 are alternately provided so as to at least partially overlap the plurality of first opening regions 7. Individual opening areas of the plurality of second opening regions 8 are larger than individual opening areas of the plurality of first opening regions 7. In FIG. 1D, each shape of the first opening region 7 is a hexagonal shape, and each shape of the second opening region 8 is shown in a circular shape, but is limited to these shapes. It is not something. That is, it is only necessary that these opening regions have an opening size through which gas can pass, and the individual shapes of the first opening region 7 and the second opening region 8 are polygonal, circular, and elliptical. It is preferable that it is at least one of these. The cooling unit 3 is made of polyester and is formed in the above-described two-layer structure by a knitting method called mesh knitting. Regarding the physical properties of the cooling unit 3, the thermal conductivity is preferably 0.06 W / m · K. However, the material of the cooling unit 3, the type of knitting method, the layer structure, and the numerical values of the thermal conductivity are not limited to these, and any configuration that can alleviate the heat radiation from the dry ice 4 is acceptable.

  Next, the flow of gas in the cooling unit 3 will be described in detail with reference to FIG. FIG. 2 is a II-II cross-sectional view of the cooling unit 3 of FIG.

A part of the dry ice 4 accommodated in the mounting portion 2 having a surface that comes into contact with the outside air sublimates due to the outside air temperature, and becomes low-temperature carbon dioxide. The carbon dioxide diffuses to the surroundings, and part of the carbon dioxide enters the cooling unit 3 from the second opening region 8 of the second mesh layer 6 of the mesh cooling unit 3 disposed between the wearing unit 2 and the body. (F ₁ ). Since carbon dioxide has a density higher than that of air, it flows downward in the cooling unit 3 along the direction of gravity. On the other hand, the air heated by the heat of the body diffuses to the surroundings, and a part thereof enters the cooling unit 3 from the first opening region 7 of the first mesh layer 5 of the cooling unit 3 (F ₂ ). . The air that has entered is at a temperature about the body temperature of the body, but is cooled by mixing with low-temperature carbon dioxide flowing in the direction of gravity (F ₃ ). A part of the mixed carbon dioxide and air flows through the first opening region 7 to the body side (F ₄ ) or through the second opening region 8 to the dry ice 4 side (F _5). ). At this time, the speed at which the gas mixture flowing along the direction of gravity flows into the first and second opening regions 7 and 8 is constant. Therefore, the flow rate of the mixed gas flowing from the first opening region 7 to the body side is from the second opening region 8 having an opening area larger than each of the first opening regions 7 to the dry ice 4 side. It becomes smaller than the flow rate of the flowing mixed gas. For forced convection heat transfer between fluid (mixed gas) and solid (body or dry ice 4) with respect to the relationship between flow rate and heat transfer, the amount of heat transfer from the fluid to the solid is a positive flow rate. It is proportional to the power. Therefore, the heat transfer amount to the body of the mixed gas passing through the first opening region 7 is smaller than the heat transfer amount to the dry ice 4 of the mixed gas passing through the second opening region 8. Further, the mixed gas flowing in the cooling unit 3 in this manner flows to the cooling unit 3 disposed below the mounting unit 2 and flows out from the second opening region 8 of the second mesh layer 6 to the outside air. Heat is dissipated. Moreover, although a certain amount of gap is provided between the cooling device 1 and the body from the viewpoint of workability, low-temperature carbon dioxide is configured to dissipate to the outside air through this gap. Therefore, frostbite of the body caused by low temperature carbon dioxide can be prevented by reducing excessive cooling of the body.

  Hereinafter, the Example which implemented the temperature measurement by applying the cooling device 1 of one Embodiment which concerns on this invention is described. The present invention is not limited to these examples. In FIG. 3, the schematic of the installation location of the temperature sensor used for the temperature change measurement implemented by wearing the cooling device 1 with the body in the temperature-controlled room (room setting temperature 45 degreeC) is shown. The correspondence between the symbols shown in FIG. 3 and the installation locations is as follows.

T1: Back of the neck T2: Left chest T3: Right chest T4: Left shoulder blade T5: Right shoulder blade T6: Neck muscle T7: Lower back Next, each example refers to the graph showing the temperature result of each example in FIG. To explain. At the same time as this temperature measurement, carbon dioxide concentration measurement was also carried out, and the result was a concentration of 0.1 to 0.14% in all examples, and did not reach a concentration that adversely affects the human body (reference) : The Japan Society for Occupational Health recommends a limit of 0.5% (5000 ppm) for healthy adults, based on labor of 8 hours a day and 40 hours a week.) .
Example 1
In this example (test condition A-1), five pieces of dry ice 4 having a square shape (length: 115 mm, width: 60 mm, thickness: 20 mm) of about 250 g were used. These dry ices 4 were accommodated in the mounting portions 2 corresponding to the back of the neck (T1), the left breast (T2), the right breast (T3), the left scapula (T4), and the right scapula (T5), respectively. In this embodiment, the clothing is worn in the order of underwear, shirt, cooling device 1 and work clothes from the body side, and a temperature sensor is placed between the underwear and the shirt, and the above-mentioned seven points are installed. Temperature measurement was performed over a period of minutes. In addition, it measured over 30 minutes also about temperature T0 in a constant temperature room as reference temperature.

The temperature measurement result of this example is as shown in FIG. The temperature of the left chest (T2) and right chest (T3), which obtained a low value among the measurement points, was in the range of 2 to 12 ° C with respect to the atmospheric temperature of about 45 ° C. It is not temperature. Further, the portions other than the left breast (T2) and the right breast (T3) had a cooling effect of about 8 to 24 ° C. at 21 to 37 ° C. with respect to the atmospheric temperature of about 45 ° C.
(Example 2)
In this example (test condition A-2), seven pieces of dry ice 4 having a square shape (length: 115 mm, width: 60 mm, thickness: 20 mm) of about 250 g were used. These dry ices 4 are placed in the mounting part 2 corresponding to the back of the neck (T1), the left breast (T2), the right breast (T3), the left scapula (T4), the right scapula (T5), and the two abdomen. Each housed. In this embodiment, the clothing is worn in the order of underwear, shirt, cooling device 1 and work clothes from the body side, and a temperature sensor is placed between the underwear and the shirt, and the above-mentioned seven points are installed. Temperature measurement was performed over a period of minutes. Note that the temperature T0 in the temperature-controlled room was also measured as a reference temperature for 30 minutes as in the above-described example.

The temperature measurement result of this example is as shown in FIG. The temperature of the right chest (T3), which obtained the lowest value among the measurement points, was in the range of 8 to 15 ° C with respect to the atmospheric temperature of about 45 ° C, but it was below the freezing point that could cause frostbite. Absent. Furthermore, about locations other than the right breast (T3), the cooling effect was about 11 to 25 ° C. at 20 to 34 ° C. with respect to the atmospheric temperature of about 45 ° C.
(Example 3)
In this example (test condition B-1), five pieces of dry ice 4 having a square shape (length: 115 mm, width: 60 mm, thickness: 20 mm) of about 250 g were used. These dry ices 4 were accommodated in the mounting portions 2 corresponding to the back of the neck (T1), the left breast (T2), the right breast (T3), the left scapula (T4), and the right scapula (T5), respectively. In this embodiment, the garment is worn in the order of underwear, work clothes, and cooling device 1 from the body side, and a temperature sensor is placed between the underwear and work clothes for 30 minutes at the above-mentioned seven installation points. Temperature measurement was carried out over the entire area. Note that the temperature T0 in the temperature-controlled room was also measured as a reference temperature for 30 minutes as in the above-described example.

The temperature measurement result of this example is as shown in FIG. The temperature of the right breast (T3), which obtained the lowest value among the measurement points, was in the range of 5 to 13 ° C with respect to the atmospheric temperature of about 45 ° C, but it was below the freezing point that could cause frostbite. Absent. Furthermore, about the places other than the right breast (T3), the cooling effect was about 8 to 30 ° C. at 15 to 37 ° C. with respect to the atmospheric temperature of about 45 ° C.
Example 4
In this example (test condition B-2), seven pieces of dry ice 4 having a square shape (length: 115 mm, width: 60 mm, thickness: 20 mm) of about 250 g were used. These dry ices 4 are placed in the mounting part 2 corresponding to the back of the neck (T1), the left breast (T2), the right breast (T3), the left scapula (T4), the right scapula (T5), and the two abdomen. Each housed. In this embodiment, the garment is worn in the order of underwear, work clothes, and cooling device 1 from the body side, and a temperature sensor is placed between the underwear and work clothes for 30 minutes at the above-mentioned seven installation points. Temperature measurement was carried out over the entire area. Note that the temperature T0 in the temperature-controlled room was also measured as a reference temperature for 30 minutes as in the above-described example.

  The temperature measurement result of this example is as shown in FIG. The temperature of the right chest (T3), which obtained the lowest value among the measurement points, was in the range of 4 to 20 ° C with respect to the atmospheric temperature of about 45 ° C. However, the temperature was below the freezing point that could cause frostbite. Absent. Furthermore, about locations other than the right breast (T3), the cooling effect was about 4 to 25 ° C. at 20 to 41 ° C. with respect to the atmospheric temperature of about 45 ° C.

(A) is a front view of the cooling device concerning one embodiment of the present invention. (B) is a rear view of the cooling device concerning one embodiment of the present invention. (C) is a perspective view which shows the internal structure of the mounting part of (a) and (b). (D) is a perspective view which shows the detail of the cooling part of (c). It is II-II sectional drawing of the cooling part of FIG.1 (d). It is the schematic which shows the installation location of a temperature sensor. It is a graph which shows the temperature result of each Example which applied the cooling device which concerns on one Embodiment of this invention. It is a schematic diagram which shows one form of the conventional cooling device. It is a schematic diagram which shows another form of the conventional cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Mounting part 3 Cooling part 4 Dry ice 5 1st mesh layer 6 2nd mesh layer 7 1st opening area 8 2nd opening area

Claims (7)

A mounting portion that can store dry ice for cooling the body, and a mesh-shaped cooling portion that is disposed at least between the mounting portion and the body and below the mounting portion, and allows carbon dioxide cold air generated from the dry ice to pass therethrough. When,
Have
The cooling part is
A plurality of first opening regions are alternately provided, and the first mesh layer located on the body side;
A plurality of second mesh layers located on a side opposite to the body, the mesh layers being alternately provided and having individual opening areas larger than individual opening areas of the plurality of first opening regions; A second mesh layer with two open areas;
Having
Cooling system.   The cooling device according to claim 1, wherein the plurality of second opening regions are provided so as to at least partially overlap the plurality of first opening regions.   The cooling device according to claim 1 or 2, wherein the mounting portion is provided facing at least one of the back of the neck of the body, the left chest, the right chest, the left shoulder blade, and the right shoulder blade. The cooling unit is provided from the front to the back of the body,
The cooling unit disposed on the front surface of the body is disposed below the mounting unit.
The cooling device according to any one of claims 1 to 3.   The cooling device according to claim 4, wherein two mounting parts are provided in parallel below the cooling part provided on the front surface of the body.   The individual shapes of the plurality of first opening regions and the individual shapes of the plurality of second opening regions in the cooling unit are at least one of a polygon, a circle, and an ellipse. The cooling device according to any one of 5.   The cooling device according to any one of claims 1 to 6, wherein the cooling section has a thermal conductivity of 0.06 W / m · K.

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