JP2014035146A - Cooling box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling box which prevents dew condensation and improves energy efficiency.SOLUTION: A cooling box is formed so as to include: cold storage chambers 20, 30, 40 which maintain stored objects at low temperatures; an outer wall part of a cooling box body 10 which encloses the cold storage chambers 20, 30, 40; and a heat generation part 110 which is provided outside the cold storage chambers 20, 30, 40 and generates heat; and a heat radiation part 63 which is thermally connected with the heat generation part 110 and is provided below the outer wall part, the heat radiation part 63 which radiates heat generated from the heat generation part 110 to air outside the cold storage chambers 20, 30, 40 and rises the air heated by heat radiation along the outer wall part.

Description

  The present invention relates to a cool box for keeping stored items cold.

  Conventionally, a cool box equipped with a vapor compression refrigeration cycle is known (for example, see Patent Document 1). The condenser pipe that constitutes a part of the refrigeration cycle needs to dissipate the heat of condensation of the high-temperature and high-pressure refrigerant compressed by the compressor to the external space, and is therefore arranged along the outer wall of the cool box.

Japanese Patent Publication No. 7-18635

  Incidentally, the condenser pipe has a function of heating the outer wall surface in order to prevent dew condensation from occurring on the outer wall surface of the cool box in addition to the function of radiating the heat of condensation of the high-temperature and high-pressure refrigerant to the external space. For this reason, the condenser pipe is generally routed so as to meander along each of a plurality of outer wall surfaces (for example, the four side surfaces and the ceiling surface of the cool box) of the cool box. As a result, the distance that the condenser pipe is routed becomes longer than the distance necessary to dissipate the heat of condensation of the refrigerant. Therefore, since extra energy is required when circulating the refrigerant in the refrigeration cycle, there has been a problem that the energy efficiency of the cool box is lowered.

  An object of the present invention is to provide a cool box capable of preventing condensation and improving energy efficiency.

  The object is to keep the stored items cold, an outer wall surrounding the cold storage chamber, a heat generating unit provided outside the cold storage chamber and generating heat, and being thermally connected to the heat generating unit. A heat dissipating part that is provided below the outer wall part and dissipates heat generated in the heat generating part to the air outside the cold insulation chamber and raises the air heated by the heat dissipating along the outer wall part. Achieved by a cold storage.

  In the cool box according to the present invention, a heat dissipating chamber disposed below the cool insulating chamber and provided with the heat dissipating portion, and a vent hole provided in the heat dissipating chamber and allowing air to flow in and out of the heat dissipating chamber. It further has these.

  In the cool box according to the present invention, the heat generating part is disposed in the heat radiating chamber.

  In the cool box according to the present invention, the heat dissipating part is provided in the same plane as the surface of the outer wall part.

  The cold storage of the present invention further includes a door member capable of opening and closing the cold storage chamber, and a structure that disturbs a flow of air rising along the outer wall portion around the door member in the outer wall portion. Is formed.

  The cool box of the present invention further includes a door member capable of opening and closing the cool chamber, and the heat radiating portion is provided only below the vicinity of the door member.

  In the cool box of the present invention, the outer wall portion includes a first outer wall portion, a second outer wall portion formed outside the first outer wall portion, the first outer wall portion, and the second outer wall portion. It is formed between the outer wall portion and has a layered space for circulating rising air.

  In the cool box of the present invention described above, the outer wall portion has a teardrop shape with the head facing downward.

  In the cool box according to the present invention, the heat generating unit includes a condenser of a refrigeration cycle.

  ADVANTAGE OF THE INVENTION According to this invention, the cold storage which can prevent dew condensation and can improve energy efficiency is realizable.

It is a front view showing the composition of the outline of cold storage 1 by a 1st embodiment of the present invention. It is sectional drawing which shows the schematic structure of the cool box 1 cut | disconnected by the AA line of FIG. It is a figure which shows the cross-sectional structure of a side part as a modification of the cool box 1 by the 1st Embodiment of this invention. It is a side view which shows the structure of the outline of the cold storage 2 by the 2nd Embodiment of this invention. It is a side view which shows the modification of the structure of the cold storage 2 by the 2nd Embodiment of this invention. It is a side view which shows the schematic structure of the cool box 3 by the 3rd Embodiment of this invention. It is a figure which shows the example of the structure formed in area | region A4, A5 in the cool box 3 by the 3rd Embodiment of this invention. It is a figure which shows the cross-sectional structure of a side part as a modification of the cool box 3 by the 3rd Embodiment of this invention. It is a figure which shows the schematic structure of the cool box 4 by the 4th Embodiment of this invention.

[First Embodiment]
The cool box according to the first embodiment of the present invention will be described with reference to FIGS. In all the following drawings, the dimensions and ratios of the respective constituent elements are appropriately varied for easy understanding. Moreover, the positional relationship (for example, up-and-down relationship) between the components in the specification is that when the cool box is installed in a usable state. FIG. 1 is a front view showing a schematic configuration of a cool box 1 according to the present embodiment. FIG. 2 is a cross-sectional view illustrating a schematic configuration of the cool box 1 cut along line AA in FIG. 1. Hereinafter, the front side (door side) side surface of the outer wall surface of the cool box 1 may be referred to as “front”, and the back side surface may be referred to as “back”. Moreover, the left and right side surfaces, the front surface, and the back surface of the outer wall surface of the cool box 1 may be collectively referred to as “four side surfaces”.

  As shown in FIG.1 and FIG.2, the cool box 1 has the rectangular parallelepiped cool box main body 10 by which the opening part was formed in the front. In the inside of the cool box main body 10, as three cold storage rooms having different cold storage temperatures, a refrigerator room 20 arranged in the upper stage, a freezing room 30 arranged in the middle stage, and a vegetable room 40 arranged in the lower stage. Is provided. The refrigerator compartment 20 and the freezer compartment 30 are partitioned by a partition wall 50 formed using a heat insulating material. The freezer compartment 30 and the vegetable compartment 40 are partitioned by a partition wall 51 formed using a heat insulating material.

  The cool box body 10 includes an outer wall formed of, for example, a thin metal plate, an inner wall formed of, for example, an ABS resin, and a heat insulating material filled in a space between the outer wall and the inner wall. That is, the cool box main body 10 has a layer structure including an outer wall, a heat insulating material, and an inner wall. As the heat insulating material, a fiber heat insulating material (for example, glass wool), a foamed resin heat insulating material (for example, polyurethane foam), or the like is used.

  A door member 21 (not shown in FIG. 1) that can open and close the opening of the refrigerator compartment 20 is provided at the opening end of the refrigerator compartment 20. The door member 21 is rotatably attached to the cool box main body 10 via a hinge portion (not shown). The door member 21 in the closed state comes into contact with the entire circumference of the open end of the refrigerator compartment 20 via a packing (not shown). The door member 21 includes, for example, an outer wall formed of a thin metal plate, an inner wall formed of, for example, ABS resin, and a heat insulating material filled in a space between the outer wall and the inner wall. That is, the door member 21 has the same layer structure as that of the cool box main body 10. In the state where the door member 21 is closed, the refrigerator compartment 20 surrounded by the heat insulating material becomes a heat insulating space thermally insulated from the outside.

  A door member 31 (not shown in FIG. 1) that can open and close the opening of the freezer compartment 30 is provided at the open end of the freezer compartment 30. The door member 31 has a structure that can slide in the front-rear direction with respect to the cool box body 10. A freezer compartment tray (not shown) provided in the freezer compartment 30 is fixed to the door member 31. The freezer compartment tray is pulled out by pulling the door member 31 forward. The door member 31 in the closed state comes into contact with the open end of the freezer compartment 30 via a packing (not shown). The door member 31 has a layer structure including an outer wall, an inner wall, and a heat insulating material, similarly to the cool box main body 10. In the state where the door member 31 is closed, the freezer compartment 30 surrounded by the heat insulating material becomes a heat insulating space thermally insulated from the outside.

  A door member 41 (not shown in FIG. 1) capable of opening and closing the opening of the vegetable compartment 40 is provided at the opening end of the vegetable compartment 40. The door member 41 has a structure that can slide in the front-rear direction with respect to the cool box main body 10. A vegetable compartment tray (not shown) provided in the vegetable compartment 40 is fixed to the door member 41. The vegetable compartment tray is pulled out by pulling the door member 41 forward. The door member 41 in the closed state comes into contact with the open end of the vegetable compartment 40 through a packing (not shown). The door member 41 has a layer structure including an outer wall, an inner wall, and a heat insulating material, similarly to the cool box body 10. In the state where the door member 41 is closed, the vegetable compartment 40 surrounded by the heat insulating material becomes a heat insulating space thermally insulated from the outside.

  The cool box 1 has a vapor compression refrigeration cycle as a cooling mechanism for cooling the refrigerator compartment 20, the freezer compartment 30 and the vegetable compartment 40. The refrigeration cycle includes a compressor 100 that compresses refrigerant, a condenser pipe 110 (110a, 110b) that condenses the compressed refrigerant and dissipates the heat of condensation to the outside, and an expansion unit (not shown) that expands the condensed refrigerant. (For example, a capillary tube) and an evaporator (not shown) that evaporates the expanded refrigerant and cools the inside by vaporization heat are connected in a ring shape through a refrigerant pipe.

  The cool box 1 has a heat radiating chamber (machine room) 60 that is insulated from any of these cool rooms, below the cool rooms such as the refrigerator room 20, the freezer room 30, and the vegetable room 40. A compressor 100 is disposed in the heat radiation chamber 60. Air inlets 61 a to 61 d and air outlets 62 a to 62 d are provided on the four side surfaces of the heat radiating chamber 60 as vents through which air can flow in and out of the heat radiating chamber 60. The air outlets 62a to 62d are provided above the air inlets 61a to 61d. The air inlet 61 a and the air outlet 62 a are provided on the left side surface of the cool box 1. The air inlet 61b and the air outlet 62b are provided on the right side surface of the cool box 1. The air inflow port 61c and the air outflow port 62c are provided on the front surface of the cool box 1. The air inlet 61d and the air outlet 62d are provided on the back surface of the cool box 1. In this example, the four air inlets 61a to 61d are provided on the four side surfaces, but it is sufficient that at least one air inlet is provided. The air inlet may be formed integrally with any of the air outlets 62a to 62d. Further, the air outlet may be formed only below the portion of the four side surfaces of the cool box 1 where condensation is likely to occur (for example, in the vicinity of the door members 21, 31, 41).

  A heat radiating portion 63 is provided on the ceiling portion of the heat radiating chamber 60. The heat radiation part 63 has a hollow box shape, for example, and is formed using a material (for example, metal) having high thermal conductivity. Inside the heat radiating section 63, an upstream section 110a of the condenser pipe 110 through which a high-temperature refrigerant immediately after being discharged from the compressor 100 flows is disposed as a heat generating section that generates heat. The upstream portion 110 a is thermally connected to the heat radiating portion 63 and is snaked around the heat radiating portion 63. From the heat radiating part 63, the heat of the refrigerant flowing through the upstream part 110 a is radiated to the air in the heat radiating chamber 60.

  Of the condenser pipe 110, the downstream part 110 b on the downstream side of the upstream part 110 a is the lower opening end (area A 1) of the vegetable compartment 40 and the upper opening end (area) of the vegetable compartment 40 among the opening ends of the cool box body 10. A2), the lower opening end of the freezing chamber 30 (upper region A2), the upper opening end of the freezing chamber 30 (lower region A3), and the lower opening end of the refrigerating chamber 20 (upper region A3) in this order. It is provided to do. In the downstream part 110b of the condenser pipe 110, the high temperature refrigerant | coolant with a low temperature distribute | circulates compared with the high temperature refrigerant | coolant in the upstream part 110a. The downstream end of the downstream part 110b is connected to an expansion part (not shown).

  Next, operation | movement of the cool box 1 by this Embodiment is demonstrated. When the refrigeration cycle of the cool box 1 is operated, the high-temperature and high-pressure refrigerant compressed by the compressor 100 flows into the upstream portion 110 a of the condenser pipe 110. Heat is dissipated from the high-temperature and high-pressure refrigerant in the upstream portion 110 a to the air in the heat-dissipating chamber 60 through the lower surface and side surfaces of the heat-dissipating portion 63. The high temperature air heated by this heat radiation flows out of each of the air outlets 62a to 62d by natural convection to the outside of the cool box 1 as shown by thick arrows H1 to H4 in FIGS. Ascends along the four sides of 1.

  Further, when high-temperature air flows out from the air outlets 62a to 62d, the inside of the heat radiating chamber 60 becomes negative pressure. Therefore, as shown by thick arrows C1 to C4 in FIGS. The normal temperature air outside the cool box 1 flows from the air inlets 61a to 61d. When such inflow / outflow of air continuously occurs, air flows indicated by thick arrows C1 to C4 and thick arrows H1 to H4 are formed around the cool box 1 during operation of the refrigeration cycle. In this example, since the air outlets 62a to 62d and the air inlets 61a to 61d are provided independently of each other, the air flow can be made smooth.

  The four side surfaces of the cool box 1 are heated by heat exchange with high-temperature air rising by natural convection as indicated by thick arrows H1 to H4. Thereby, since the temperature of the 4 side surfaces of the cool box 1 can be raised, dew condensation on the 4 side surfaces can be prevented. Therefore, in many parts of the four side surfaces of the cool box, condensation can be prevented without arranging the condenser pipe. For this reason, the distance of a condenser pipe can be shortened compared with the conventional structure where a condenser pipe meanders along each of each outer wall surface of a cool box. Therefore, since energy required when circulating a refrigerant in a refrigerating cycle can be reduced, the energy efficiency of a cool box can be improved.

  Moreover, in this Embodiment, since an airflow can be produced along 4 side surfaces of the cool box 1, the air with a high dryness can be continuously supplied to the vicinity of the 4 side surfaces. Therefore, condensation on the four side surfaces can be more reliably prevented.

  Here, the opening end of the cool box main body 10 (for example, the regions A1 to A3 in FIGS. 1 and 2) is likely to cause dew condensation because the temperature tends to decrease. However, since the regions A1 to A3 do not face the flow path of the high-temperature air that rises due to natural convection, heating by heat exchange with the high-temperature air is difficult. Therefore, in this Embodiment, the downstream part 110b of the condenser pipe 110 is provided in area | region A1-A3. Thereby, since area | region A1-A3 can be heated by the thermal radiation from the high temperature refrigerant | coolant which flows through the downstream part 110b, the dew condensation in area | region A1-A3 can be prevented. As described above, the condenser pipe 110 may be partially disposed in a region of the cool box 1 where condensation is likely to occur or a region that does not face the flow path of high-temperature air.

  Further, in the present embodiment, when the refrigeration cycle of the cool box 1 is stopped, the heat radiation from the condenser pipe 110 gradually decreases, so that the flow of high-temperature air disappears and the effect of preventing condensation may be reduced. is there. Therefore, in a cool box or the like in which the refrigeration cycle operates intermittently, a heat storage material for radiating heat may be provided in the heat radiating portion 63 in order to maintain the effect of preventing condensation even during a period in which the refrigeration cycle is stopped. Good. As the heat storage material for heat dissipation, for example, a latent heat storage material having a phase change temperature in the vicinity of the temperature of the heat dissipation unit 63 during operation of the refrigeration cycle is used. During the period when the refrigeration cycle is in operation, heat is stored in the heat storage material while radiating heat from the condenser pipe 110 to the air in the heat radiation chamber 60, and during the period when the refrigeration cycle is stopped, heat is stored in the heat storage material. The generated heat is radiated to the air in the heat radiating chamber 60. Thereby, the dew condensation prevention effect can be maintained even during the period when the refrigeration cycle is stopped.

  Cold storage heat storage material (for example, latent heat storage material) that stores cold heat while the cold storage is in operation and releases the cold heat when the cold storage is stopped due to a power failure or the like to keep the cold storage room cold May be arranged. In general, in a cold storage room equipped with a heat storage material for cold storage, it is possible to keep the inside of the cold storage room for a predetermined time after a power failure, but since heat dissipation from the condenser pipe is also stopped at the time of a power failure, It was difficult to prevent condensation. On the other hand, if it is the structure provided with the thermal storage material for heat dissipation in this Embodiment, a dew condensation prevention effect can be maintained also at the time of a power failure.

  FIG. 3 shows a cross-sectional configuration of a side surface portion of the cool box 1 (cold box body 10) as a modification of the cool box 1 according to the present embodiment. The left side of FIG. 3 represents the cold storage room (for example, refrigerator room 20) side. The white thick arrow in FIG. 3 indicates the flow direction of air rising by natural convection. As shown in FIG. 3, the side surface portion of the cool box 1 of the present modification includes an inner wall portion 81, a double-structured outer wall portion 80 arranged outside the inner wall portion 81, an inner wall portion 81 and an outer wall portion 80, And a heat insulating material 82 filled in the space between them. The outer wall portion 80 is a layer formed between the main outer wall portion 83 adjacent to the heat insulating material 82, the sub outer wall portion 85 disposed outside the main outer wall portion 83, and the main outer wall portion 83 and the sub outer wall portion 85. Space 84. The space 84 becomes a flow path through which high-temperature air heated by the heat radiating portion and raised by natural convection is circulated.

  According to this modification, since the space 84 serving as a flow path for high-temperature air is defined by the main outer wall portion 83 and the sub-outer wall portion 85, high-temperature air can be prevented from diffusing around. Therefore, since both the main outer wall part 83 and the sub outer wall part 85 can be efficiently heated by high-temperature air, dew condensation on the main outer wall part 83 and the sub outer wall part 85 can be prevented. The sub-outer wall portion 85 may be formed of a plate-like member without a hole, or may be formed of a plate-like member having a hole, a nonwoven fabric, a mesh, or the like.

[Second Embodiment]
Next, the cool box according to the second embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a side view showing a schematic configuration of the cool box 2 according to the present embodiment. In addition, about the component which has the same function and effect | action as the cold storage 1 by 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

As shown in FIG. 4, in the present embodiment, heat radiation surfaces (heat radiation portions) 70 and 71 are provided on a part of the outer wall surface of the cool box 2. The heat radiating surfaces 70 and 71 are provided only below the portion of the outer wall surface where condensation is likely to occur. In this example, the evaporator is arranged on the back side of the cool box 2, and the temperature of the outer wall surface on the back side is likely to decrease, so that condensation is likely to occur on the back side in addition to the vicinity of the door member. . In this example, the heat radiating surface 70 is provided below the vicinity of the door members 21, 31, and 41 (area A <b> 4) among the left and right side surfaces of the cool box 2, and the back surface of the cool box 2 and the left and right side surfaces. A heat radiating surface 71 is provided below a portion (region A5) close to the surface. The heat radiating surfaces 70 and 71 are formed using a material having high thermal conductivity (for example, metal), and are thermally connected to the condenser pipe 110 (not shown in FIG. 4). The heat radiating surfaces 70 and 71 are located in substantially the same plane as the outer wall surface of the cool box 2. From the heat radiating surfaces 70, 71, the heat of the high-temperature refrigerant flowing through the condenser pipe 110 is radiated to the air near the heat radiating surfaces 70, 71. The high-temperature air heated by this heat dissipation rises along the regions A4 and A5 by natural convection as shown by the thick arrows in FIG. The vertical width of the heat radiating surfaces 70 and 71 is, for example, about 5 cm. The heat transfer coefficient between the heat radiation surfaces 70 and 71 having a width of 5 cm and the air rising by natural convection is 20 to 30 W / (m ² · K).

  The areas A4 and A5 on the outer wall surface of the cool box 2 are heated by heat exchange with high-temperature air rising by natural convection. Thereby, since the temperature of area | region A4, A5 of the outer wall surface of the cool box 2 can be raised, the dew condensation in area | region A4, A5 can be prevented. Compared with the first embodiment, the cool box 2 according to the present embodiment has the heat radiation surfaces 70 and 71 located substantially in the same plane as the outer wall surface, and is formed with an air inlet and an air outlet. Therefore, each outer wall surface of the cool box 2 can be flattened.

  In the present embodiment, since the heat radiation surfaces 70 and 71 are provided only below the regions A4 and A5 where condensation easily occurs, the heat released from the condenser pipe 110 is concentratedly supplied to the regions A4 and A5. can do. Therefore, the dew condensation in the areas A4 and A5 can be prevented more reliably.

  Here, in the present embodiment, it is desirable that the emissivity of the outermost surfaces of the heat radiation surfaces 70 and 71 is as low as possible. By reducing the emissivity of the heat radiating surfaces 70 and 71, heat escape due to radiation can be prevented, so that a temperature difference between the heat radiating surfaces 70 and 71 and air can be secured, and natural convection can be efficiently generated. Examples of the low emissivity surface include a metal polished surface.

  FIG. 5 is a side view showing a modified example of the configuration of the cool box 2 according to the present embodiment. As shown in FIG. 5, in the cool box 2 of this modification, a heat radiating surface 72 having a narrower width in the vertical direction than the heat radiating surfaces 70 and 71 is provided in portions other than below the regions A4 and A5 where condensation easily occurs. ing. The heat dissipation surface 72 is formed of the same material as the heat dissipation surfaces 70 and 71. From the heat radiating surface 72, the heat of the high-temperature refrigerant flowing through the condenser pipe 110 is radiated to the air near the heat radiating surface 72. Since the vertical width of the heat radiating surface 72 is narrower than the heat radiating surfaces 70 and 71, the amount of heat radiated from the heat radiating surface 72 is smaller than the amount of heat radiated from the heat radiating surfaces 70 and 71. The air heated by the heat radiation from the heat radiation surface 72 rises along the side surface of the cool box 2 by natural convection, as shown by thin arrows in FIG. In this modification, the heat released from the condenser pipe 110 can be supplied to the regions A4 and A5 in a concentrated manner, and can also be supplied to other regions. Therefore, in this modification, it is possible to prevent dew condensation not only in the regions A4 and A5 where condensation is likely to occur, but also in other portions.

[Third Embodiment]
Next, a cool box according to a third embodiment of the present invention will be described with reference to FIGS. FIG. 6 is a side view showing a schematic configuration of the cool box 3 according to the present embodiment. In addition, about the component which has the same function and effect | action as the cool box 1 by 1st Embodiment or the cool box 2 by 2nd Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 6, in the present embodiment, the regions A4 and A5, which are located above the heat radiation surfaces 70 and 71 among the left and right side surfaces and the back surface of the cool box 3, and are likely to cause dew condensation, include the side surface and the back surface. The structure which disturbs the flow of the hot air which rises along is formed (in FIG. 6, the formation area of the structure is shown by hatching). The structure is provided, for example, to thin the temperature boundary layer by disturbing the air flow near the side or back surface. The heat transfer coefficient between the surface and air is inversely proportional to the thickness of the temperature boundary layer. For this reason, by thinning the temperature boundary layer with the structure, the heat transfer coefficient between the surface and air can be improved, and the surface can be efficiently heated. Therefore, it is possible to more reliably prevent condensation in the regions A4 and A5 where condensation is likely to occur.

  7A to 7C show examples of structures that disturb the flow of air. The white thick arrows in FIGS. 7A to 7C indicate the flow direction of air rising by natural convection. FIG. 7A shows a configuration in which the surface on which the interruption fin is formed is viewed from the front. The interruption fin is constituted by a plurality of fins 75 formed intermittently. Since the continuous development of the temperature boundary layer 75a is hindered by providing the interruption fin, the temperature boundary layer 75a can be thinned and the heat transfer coefficient can be improved. FIG. 7B shows a configuration in which the surface on which the stud (pin) 76 is formed is viewed obliquely. By providing the stud 76, the turbulent flow of the temperature boundary layer is promoted, so that the heat transfer coefficient can be improved. FIG.7 (c) has shown the structure which looked at the surface in which the vortex generator was formed from diagonally. The vortex generator has a configuration in which a plate 77 having a height about the thickness of the temperature boundary layer is installed at a predetermined elevation angle with respect to the flow. By providing a vortex generator, a vertical vortex is generated in the flow and separation is suppressed, so that the heat transfer rate can be improved.

  The structures formed in the regions A4 and A5 may be riblets that reduce the frictional drag by weakening the disturbance of the turbulent boundary layer as shown in FIG. For example, the height h of the riblet is 0.1 mm, and the interval b is 0.1 mm. Moreover, the structure formed in area | region A4, A5 may be a convex part, a recessed part, an unevenness, etc. which increase the heat-transfer area between the rising air and the surface. These structures can also improve the heat transfer coefficient between the surface and air.

  FIG. 8 shows a cross-sectional configuration of a side surface portion of the cool box 3 as a modification of the cool box 3 according to the present embodiment. As shown in FIG. 8, the outer wall portion 80 of this modification includes a main outer wall portion 83 adjacent to the heat insulating material 82, a sub-outer wall portion 85 disposed outside the main outer wall portion 83, a main outer wall portion 83, A layered space 84 formed between the outer wall 85 and the outer wall 85. The space 84 becomes a flow path through which high-temperature air heated by the heat radiating portion and raised by natural convection is circulated. Structures such as fins (interrupting fins) 75 are formed on the surface of the main outer wall 83 on the space 84 side, for example.

  According to this modification, not only can the heat transfer coefficient between the outer wall 80 (particularly the main outer wall 83) and the air be improved, but the space 84 serving as a flow path for high-temperature air is also the main outer wall 83. In addition, since it is defined by the sub-outer wall portion 85, it is possible to prevent high-temperature air from diffusing around. Therefore, since both the main outer wall part 83 and the sub outer wall part 85 can be efficiently heated by high-temperature air, dew condensation on the main outer wall part 83 and the sub outer wall part 85 can be prevented.

[Fourth Embodiment]
Next, a cool box according to the fourth embodiment of the present invention will be described with reference to FIG. FIG. 9 shows a schematic configuration of the cool box 4 according to the present embodiment. In addition, about the component which has the same function and effect | action as the cold storage 1 by 1st Embodiment, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  As shown in FIG. 9, the cool box 4 has a cool box body 10 in which an opening is formed in a part of the side surface. Inside the cool box main body 10, a refrigerator room is provided as a cool room. A door member 21 that can open and close the opening of the refrigerator compartment is provided at the opening end of the refrigerator compartment. The cool box main body 10 and the closed door member 21 have a streamlined (teardrop-shaped) outer shape with the head (wide side) facing vertically downward and the tail (narrow side) facing vertically upward. ing. That is, the cool box main body 10 and the closed door member 21 (the outer wall portion surrounding the cool chamber) have an outer shape with a small drag coefficient against air flowing vertically downward. Moreover, since the horizontal cross section of the cool box main body 10 and the door member 21 in the closed state is circular, the shape of the cool box main body 10 and the door member 21 is isotropic with respect to the air flow from below. Yes.

  Moreover, the structure as shown, for example in FIG. 7 (a)-(d) is formed in the area | region (area | region where condensation tends to occur) of the outer wall surface of the cool box main body 10 around the door member 21. (In FIG. 9, the formation area of the structure is indicated by hatching). Three legs 90a, 90b, 90c are attached to the lower part of the cool box main body 10. The cool box body 10 is held at a position higher than the installation surface of the cool box 4 by the leg portions 90a, 90b, 90c.

  A compressor 100 is disposed below the cool box main body 10. A disk-shaped heat radiating plate (heat radiating portion) 91 is provided horizontally above the compressor 100 and directly below the cool box main body 10. The diameter of the heat sink 91 is larger than the maximum diameters of the cool box main body 10 and the door member 21. The heat radiating plate 91 is thermally connected to a condenser pipe (not shown) through which the high-temperature refrigerant discharged from the compressor 100 flows. Between the condenser pipe and the expansion part provided in the cool box main body 10 and between the evaporator provided in the cool box main body 10 and the compressor 100, either of the legs 90a, 90b, 90c is provided. Are connected by refrigerant piping arranged.

  When the refrigeration cycle of the cool box 4 is operated, the high-temperature refrigerant discharged from the compressor 100 flows into the condenser pipe. Heat is radiated from the high-temperature refrigerant in the condenser pipe mainly to the air above the heat radiating plate 91 via the heat radiating plate 91. The high-temperature air heated by this heat dissipation rises by natural convection and flows along the outer wall surfaces of the cool box main body 10 and the door member 21. The streamline which is the outer shape of the cool box main body 10 and the door member 21 has an extremely low drag coefficient compared to other shapes. For example, the drag coefficient of streamline is about 1/12 of a sphere and 1/25 of a cube. For this reason, the high temperature air rising by natural convection tends to flow smoothly to the upper part without peeling along the outer wall surfaces of the cool box main body 10 and the door member 21. Therefore, since the outer wall surfaces of the cool box main body 10 and the door member 21 are heated by heat exchange with high-temperature air over the whole, dew condensation on the outer wall surfaces can be prevented. Moreover, since the streamlined cool box main body 10 and the door member 21 can smoothly flow air along the outer wall surface even when the dimensions are increased as compared with other shapes, the capacity of the cool chamber is increased. be able to.

  Moreover, in the area | region around the door member 21 among the cooler main bodies 10, since the heat transfer rate between an outer wall surface and high temperature air can be improved with a structure, the said outer wall surface is heated efficiently. Can do. Therefore, it is possible to more reliably prevent condensation in the area around the door member 21 where condensation is likely to occur. Moreover, since the shape is close to a sphere, the surface area relative to the internal volume can be reduced as compared with a normal square cold storage, so that the interior can be efficiently cooled.

The present invention is not limited to the above embodiment, and various modifications can be made.
For example, in the above-described embodiment, the example in which the condenser pipe is used as the heat generating part has been described. However, the present invention is not limited thereto, and a compressor may be used as the heat generating part.

  Moreover, in the said embodiment, although the high temperature air heated with the thermal radiation part is raised by natural convection, this invention is not limited to this, The auxiliary | assistant fan which forcibly raises high temperature air is provided. Also good.

  Moreover, in the cool box of the said embodiment, you may install a heater and a condenser pipe about the part which cannot prevent dew condensation only by heat exchange with high temperature air.

  Further, the above embodiments and modifications can be implemented in combination with each other.

  The present invention can be widely used in the field of cold storage for keeping stored items cold.

1, 2, 3, 4 Cold storage 10 Cold storage main body 20 Refrigeration chamber 21, 31, 41 Door member 30 Freezing chamber 40 Vegetable chamber 50, 51 Partition wall 60 Radiation chamber 61a-61d Air inlet 62a-62d Air outlet 63 Heat radiation part 70, 71, 72 Heat radiation surface 75 Fin 75a Temperature boundary layer 76 Stud 77 Plate 80 Outer wall part 81 Inner wall part 82 Insulating material 83 Main outer wall part 84 Space 85 Sub outer wall part 90a, 90b, 90c Leg part 91 Heat sink 100 Compression Machine 110 Condenser pipe 110a Upstream part 110b Downstream part

Claims (9)

A cold room for keeping stored items cold;
An outer wall surrounding the periphery of the cold room;
A heating unit provided outside the cold insulation chamber and generating heat;
Thermally connected to the heat generating part and provided below the outer wall part, dissipates heat generated in the heat generating part to the air outside the cold insulation chamber, and air heated by heat dissipation along the outer wall part A cool box having a heat dissipating part to be raised. In the cool box according to claim 1,
A heat dissipating chamber disposed below the cold insulation chamber and provided with the heat dissipating part; and
A cold storage further comprising a vent provided in the heat radiating chamber and allowing air to flow in and out of the heat radiating chamber. In the cool box according to claim 2,
The heat generating part is disposed in the heat radiating chamber. In the cool box according to claim 1,
The heat radiating part is provided in the same plane as the surface of the outer wall part. In the cool box according to any one of claims 1 to 4,
A door member capable of opening and closing the cold storage chamber;
A structure that disturbs the flow of air rising along the outer wall portion is formed around the door member in the outer wall portion. In the cool box according to any one of claims 1 to 4,
A door member capable of opening and closing the cold storage chamber;
The heat radiating part is provided only below the vicinity of the door member. In the cool box according to any one of claims 1 to 6,
The outer wall portion is formed between a first outer wall portion, a second outer wall portion formed outside the first outer wall portion, and the first outer wall portion and the second outer wall portion. And a layered space for circulating rising air. In the cool box according to any one of claims 1 to 7,
The outer wall portion has a teardrop-shaped shape with the head facing downward. In the cool box according to any one of claims 1 to 8,
The heat generating part includes a condenser of a refrigeration cycle.

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