JP2012202603A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that is improved in cooling efficiency and reduced in power consumption by suppressing the heat absorption quantity of a surface of an outer box.SOLUTION: The refrigerator includes: a heat insulation box 101 which comprises an inner box 103 and an outer box 102 and is provided with a heat insulator between the inner box 103 and outer box 102; a lower machine room 107 constituted below the heat insulation box 101; a compressor 108 installed in the lower machine room 107; a heat insulation door 119 which opens and closes an opening front of the heat insulation box 101; and a storage compartment 106 which is formed with the heat insulation box 101 and heat insulation door 119 and has a plurality of temperature zones that are different from one another. A projection shape 129, which suppresses heat absorption from natural convection of high temperature generated from a surface of the compressor 108 which becomes higher in temperature than the outside air during operation, is provided on a surface of the outer box 102 of the heat insulation box 101 in which the natural convection circulates. Consequently, there is provided the refrigerator which is reduced in heat absorption quantity from the surface of the outer box 102 and thereby improved in cooling efficiency to have a small power consumption.

Description

  The present invention relates to a refrigerator having a high energy saving effect.

  FIG. 7 is a longitudinal sectional view of a basic structure of a freezer compartment of a conventional refrigerator.

  As shown in FIG. 7, the refrigerator box 10 includes a vacuum heat insulating material 50, 52, 53, 55 disposed in a heat insulating wall formed by the outer box 11 and the inner box 13, and the outer box 11, the inner box 13, and the inner box 13. The box 13 and the vacuum heat insulating materials 50, 52, 53, and 55 can be bonded to each other, and are configured to have a foam heat insulating material 12 such as urethane having an adhesive force.

  In the inner box 10, there are a refrigerated temperature chamber 14 having a set temperature of 10 ° C. or less having a vegetable room and a chilled chamber (not shown), and a freezing temperature chamber having a set temperature of −16 ° C. to −30 ° C. having an ice making room and a quick freezer room. 15, and each room is partitioned by a front partition 16 and a partition wall 17.

  A door body 30 that closes the front face of the opening so as to be openable and closable is provided on the front face of the refrigeration temperature chamber 14. This door body 30 can be bonded to the vacuum heat insulating material 52 installed in the heat insulating wall formed by the outer box 31 and the inner box 33, and to the outer box 31, the inner box 33 and the vacuum heat insulating material 50. It is configured to have a foam heat insulating material 32 such as urethane having an adhesive force.

  The front surface of the opening of the freezing temperature chamber 15 is provided with a door body 35 that closes the front surface of the opening so as to be opened and closed. This door body 35 can be bonded to the vacuum heat insulating material 54 installed in the heat insulating wall formed by the outer box 36 and the inner box 38, and to the outer box 36, the inner box 38 and the vacuum heat insulating material 54. It is configured to have a foam heat insulating material 37 such as urethane having adhesive strength to itself.

  Although not shown in FIG. 7, the front of each storage chamber is closed by an independent door. For example, the ice making chamber and the quick freezing chamber are partitioned by a member corresponding to the front partition 16. The door is received by the front partition 16 equivalent member. In addition, the storage rooms having different temperature zones are partitioned by a member corresponding to the partition wall 17, and the member corresponding to the partition wall 17 has a heat insulating structure.

  In addition, a lower machine chamber is formed below the freezing temperature chamber 15 via a heat insulating wall, and a compressor 40 is installed.

  These vacuum heat insulating materials 50, 52, 52, 53, 54, and 55 can realize higher heat insulating performance than the foam heat insulating materials 12, 32, and 37, for example, heat conduction of the foam heat insulating material 12 on the box 10 side. While the rate is about 0.016 W / mK and the thermal conductivity of the foam insulation 32 and 37 on the door body side is about 0.018 W / mK, the vacuum insulation 50, 52, 52, 53, 54 and 55 The thermal conductivity can be about 0.002 W / mK to about 0.003 W / mK.

  Accordingly, assuming that the heat insulating wall area where heat leakage occurs is constant, a vacuum heat insulating material having a thickness dimension of about 1/5 to 1/9 of the heat insulating wall thickness formed only of a foam heat insulating material such as urethane is provided. If used, the amount of heat leakage from the heat insulating wall can be set to be equal.

  The vacuum heat insulating materials 50, 52, 52, 53, 54, 55 are installed on each surface in the heat insulating wall around the refrigeration temperature chamber 14 and in the heat insulating wall around the refrigeration temperature chamber 15, as shown in FIG. ing.

  As for these vacuum heat insulating materials, the volume of the vacuum heat insulating material which occupies the heat insulating wall volume formed by the outer box 11 and the inner box 13 as the temperature difference between the refrigerator internal temperature and the box outer surface ambient temperature increases. The rate is set large.

For example, assuming that the heat insulation wall area around the refrigeration temperature chamber 14 and the heat insulation wall area around the refrigeration temperature chamber 15 are the same area, the vacuum heat insulating material 50 installed in the heat insulation wall thickness Tr around the refrigeration temperature chamber 14; When the thickness of 52, 52 is the tr dimension, and the thickness of the vacuum heat insulating materials 53, 54, 55 installed in the heat insulating wall thickness Tf around the freezing temperature chamber 16 is the tf dimension,
tf / Tf> tr / Tr
It is comprised so that it may become.

  That is, the larger the temperature difference between the temperature inside the box and the ambient temperature on the outer surface of the box body, the larger the volume ratio of the vacuum heat insulating material to the heat insulating wall volume formed by the outer box 11 and the inner box 13 is set. is there.

  In this way, by setting a larger volume ratio of the vacuum heat insulating material in the heat insulating wall volume formed by the outer box and the inner box, the larger the temperature difference between the internal temperature and the box outer surface ambient temperature, It has been proposed to provide a refrigerator that can promote energy saving operation and improve energy saving performance as a whole (see, for example, Patent Document 1).

JP 2006-189207 A

  However, the above-described conventional configuration specializes in how heat absorbed by heat exchange between the outside air and the outer box surface is not increased to reach the interior by increasing heat insulation. No consideration is given to replacement, that is, to reduce the amount of heat absorbed from the outer box surface itself. In particular, the compressor surface installed in the lower machine room at the bottom of the refrigerator becomes hotter than the outside air during the cooling operation, so an upward air flow (natural convection) is generated from the temperature of the surrounding air, and the outer box surface Along the top. Since the high-temperature updraft exchanges heat with the outer box surface, the amount of heat absorbed from the outer box surface is large.

  The present invention solves the above-described conventional problems, and provides a refrigerator that reduces heat absorption by suppressing heat exchange on the surface of the outer box, thereby improving cooling efficiency and reducing power consumption. With the goal.

  In order to solve the above-described conventional problems, the refrigerator of the present invention includes an inner box and an outer box, a heat insulating box body including a heat insulating material between the inner box and the outer box, and the heat insulating box body. A lower machine room configured in a lower part of the machine, a compressor installed in the lower machine room, a heat insulating door that opens and closes an opening front of the heat insulating box, and the heat insulating box and the heat insulating door. High temperature natural convection on the outer box surface of the heat insulation box through which natural convection generated from the compressor surface that is hotter than the outside air during operation flows. An endothermic suppression shape that suppresses the endothermic heat from is provided.

  As a result, the amount of heat absorbed from the outer box surface can be reduced.

  The refrigerator of the present invention can provide a refrigerator with improved cooling efficiency and reduced power consumption by reducing the amount of heat absorbed from the outer box surface.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of this invention Cross-sectional view of the freezer compartment of the refrigerator in Embodiment 1 of the present invention Cooling chamber enlarged sectional view of the refrigerator in Embodiment 1 of the present invention The convex-shaped expanded sectional view of the outer case surface of the refrigerator in Embodiment 1 of this invention The expanded sectional view which shows the dimension of the convex shape of the outer case surface of the refrigerator in Embodiment 1 of this invention The lower expanded sectional view of the freezer compartment of the refrigerator in Embodiment 2 of the present invention. Sectional view of the freezer compartment of a conventional refrigerator

  Invention of Claim 1 is comprised by the inner box and the outer box, the heat insulation box provided with the heat insulating material between the said inner box and the said outer box, and the lower part comprised by the lower part of the said heat insulation box A plurality of different temperature zones formed by a machine room, a compressor installed in the lower machine room, a heat insulation door that opens and closes the front surface of the opening of the heat insulation box, and the heat insulation box and the heat insulation door And an endotherm that suppresses heat absorption from high-temperature natural convection on the outer box surface of the heat insulating box body through which natural convection generated from the compressor surface that is hotter than outside air during operation flows. By providing the suppression shape, it is possible to reduce the amount of heat absorbed from the outer box surface, improve the cooling efficiency, and provide a refrigerator with reduced power consumption.

  The invention according to claim 2 is the invention according to claim 1, wherein the endothermic suppression shape has a convex shape toward the outside air on the outer box surface of the heat insulating box. By simple processing, it is possible to generate a region where the flow velocity is slow behind the convex shape, and the heat transfer coefficient in the region where the flow velocity is slow is reduced, so the amount of heat absorbed from the outer box surface can be reduced, and cooling is performed. Efficiency can be improved, and as a result, power consumption can be reduced.

  According to a third aspect of the present invention, in the invention of the second aspect, a plurality of the convex shapes are formed on the same surface of the outer box surface of the heat insulating box body, so that the flow velocity is slow behind the convex shape. More areas can be generated, and the heat transfer coefficient in the area where the flow rate is slowed down, so the amount of heat absorbed from the outer box surface can be reduced, improving the cooling efficiency and consequently reducing the power consumption. Can be reduced.

  The invention according to claim 4 is the invention according to claim 2 or 3, wherein the convex shape is perpendicular to a flow direction of natural convection generated from the surface of the compressor that becomes higher temperature than outside air during operation. By providing it, it is possible to generate a large area where the flow velocity is slow behind the convex shape, and since the heat transfer coefficient of the area where the flow velocity is slow is reduced, the amount of heat absorbed from the outer box surface can be reduced, Cooling efficiency can be improved, and as a result, power consumption can be reduced.

  According to a fifth aspect of the present invention, in the invention according to any one of the second to third aspects, at least a part of the convex shape faces a storage chamber having a lowest set temperature among the storage chambers. By providing on the surface of the outer box, a larger effect of reducing the amount of absorbed heat can be obtained, and the cooling efficiency can be improved. As a result, the amount of power consumption can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, detailed description of the same configurations as those of the conventional example will be omitted. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of the refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the freezer compartment of the refrigerator according to Embodiment 1 of the present invention. FIG. 3 is an enlarged cross-sectional view of the cooling chamber of the refrigerator in the first embodiment of the present invention. FIG. 4 is an enlarged sectional view of a convex shape on the surface of the outer box of the refrigerator in the first embodiment of the present invention. FIG. 5 is an enlarged cross-sectional view showing the dimensions of the convex shape of the outer box surface of the refrigerator in the first embodiment of the present invention.

  In FIG. 1, a heat insulating box 101 of a refrigerator 100 includes an outer box 102 mainly using a steel plate and an inner box 103 molded of a resin such as ABS, and the inside thereof is made of, for example, hard foam urethane or the like. Filled with foam insulation, insulated from the surroundings, divided into a plurality of storage rooms. The refrigerator compartment 104 is arranged at the top, the vegetable compartment 105 is arranged below the refrigerator compartment 104, and the freezer compartment 106 is arranged at the bottom.

  The front opening of each storage room is closed by heat insulating doors 117, 118, and 119 that are pivotally supported on the refrigerator main body.

  The refrigerator compartment 104 is normally set to 1 ° C. to 5 ° C. at the lower limit of the temperature at which it does not freeze for refrigerated storage, and the vegetable compartment 105 is set to 2 ° C. to 7 ° C., which is a temperature setting that is equal to or slightly higher than the refrigerator compartment 104. The freezer compartment 106 is set to a freezing temperature zone, and is usually set at −22 ° C. to −15 ° C. for frozen storage, but for example, −30 ° C. or −25 ° C. to improve the frozen storage state. It may be set at a low temperature.

  A lower machine chamber 107 is formed in the rear region of the lowermost freezer compartment 106 of the heat insulation box 101 to house a high-pressure side component of the refrigeration cycle such as a compressor 108 and a dryer (not shown) for removing moisture. Yes.

  In FIG. 2, a cooling chamber 109 for generating cold air is provided on the back surface of the freezing chamber 106, and a cooling air conveyance air passage to each chamber having heat insulation properties and an insulating partition with each chamber are provided between them. The rear surface partition wall 110 is configured. A cooler 111 is disposed in the cooling chamber 109, and in the upper space of the cooler 111, cold air cooled by the cooler 111 by a forced convection method is blown to the refrigerator compartment 104, the vegetable compartment 105, and the freezer compartment 106. A cooling fan 112 is disposed, and a lower space of the cooler 111 is provided with a radiant heater 113 made of glass tube for defrosting the frost and ice adhering to the cooler 111 and its surroundings at the time of cooling. A drain pan 114 for receiving defrosted water generated at the time of defrosting and draining it outside the storage is configured at the lower part, and an evaporating dish 116 is configured outside the storage on the downstream side. In this embodiment, isobutane, which is a flammable refrigerant, is enclosed in the refrigeration cycle.

  A cool air discharge port 124 for supplying the cool air generated by the cooler 111 to the freezing chamber 106 by the cooling fan 112 and the inside of the freezing chamber 106 are circulated below the cool air discharge port 124 in the rear partition wall 110. A cold air inlet 125 for returning the cold air to the cooler 111 is provided.

  In addition, a storage case is provided in the freezer compartment 106 to be pulled out while being held by a drawer mechanism. In the present embodiment, three storage cases are arranged in the freezer compartment. Specifically, an upper storage case 126, a middle storage case 127, and a lower storage case 128 are arranged.

A door gasket 121 is provided at the inner edge of the heat insulating door 119 over the entire circumference (the door gasket is also provided in the refrigerator compartment 104 and the vegetable compartment 105).
The metal receiving member 123 and the door gasket 121 provided on the front surface of the partition wall 122 having a resin portion on the outer periphery separating 05 and the freezer compartment 106 are closely attached to prevent cold air from leaking to the outside.

  The metal receiving member 123 is provided with a heat radiating pipe 131 so as to be in close contact with the side surface of the metal receiving member 123 in the storage chamber in order to prevent condensation on the outer surface of the storage chamber. The heat radiating pipe 131 uses a high-temperature refrigerant pipe in a refrigeration cycle (not shown), and heats the metal receiving member 123 to a high temperature.

  3 and 4, a convex shape 129 is provided on the surface of the outer box 102 facing the cooling chamber 109 toward the outside air side. Specifically, a convex shape 129 is provided in the width direction of the refrigerator (from the back side to the front side in FIG. 1). Note that the surface of the outer box 102 facing the cooling chamber 109 is an example of the surface of the outer box 102.

  More specifically, the convex shape 129 has a constant interval (equal pitch) on the surface of the outer box 102 facing the cooling chamber 109 with respect to the height direction of the refrigerator 100 (vertical direction in FIG. 3). A plurality of them are provided.

  Moreover, the convex shape 129 is provided continuously in the width direction of the refrigerator.

  In the present embodiment, details of the convex shape are as follows. As shown in FIG. 5, the distance (A dimension) between adjacent convex shapes 129 is 45 mm, the width dimension (B dimension) of the convex shape 129 is 5 mm, the height dimension (D dimension) of the convex shape 129 is 3 mm, and the angle E Is 120 degrees.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  First, the flow of outside air around the lower machine room 107 will be described.

  Generally, the refrigerator 100 is installed by providing an appropriate space between a wall such as a kitchen and the outer box 102 on the back side. While the inside of the refrigerator 100 is being cooled, the surface of the operating compressor 108 becomes higher than the outside air temperature. As a result, the air near the compressor 108 is warmed, and natural convection occurs due to a temperature difference from the surrounding air. The generated natural convection becomes an upward air flow as shown by the solid arrows in FIGS. 2 and 3, and the outside space facing the cooling chamber 109 from the lower machine room 107 with the space between the wall of the kitchen or the like and the outer box 102 as an air passage. It flows upwards of the refrigerator 100 along the surface of the box 102.

  At the same time, since the inside of the lower machine room 107 becomes negative pressure due to the natural convection generated by the operation of the compressor 108, the outside air at the bottom of the refrigerator 100 as shown by the broken line arrows in FIGS. 2 and 3 enters the lower machine room 107. It is drawn in and a flow is generated using the space between the floor surface of the kitchen or the like and the outer box 102 as an air passage.

  Overall, during the cooling of the refrigerator 100, that is, while the compressor 108 is operating, a large flow from the lower part of the heat insulating door 119 to the upper rear side of the refrigerator 100 is generated.

  As described above, when the updraft due to the natural convection generated by the operation of the compressor 108 flows along the surface of the outer box 102 facing the cooling chamber 109, the surface of the outer box 102 facing the cooling chamber 109 becomes the updraft. It is heated by heat exchange. In particular, since the cooling chamber 109 is provided with the evaporator 111, it is the lowest temperature in the refrigerator 100 and the heat absorption amount is increased.

However, by providing the convex shape 129 so as to be perpendicular to the ascending air current as in the present invention, as shown by the arrow in FIG. 4, it is possible to generate a region where the flow velocity is slow behind the convex shape 129, Since the heat transfer coefficient in the region where the flow velocity is slowed down, the amount of heat absorbed from the surface of the outer box 102 facing the cooling chamber 109 can be suppressed, thereby improving the cooling efficiency and consequently reducing the power consumption. Can be reduced.

  In addition, since the cooling of the cold air can be suppressed, the cold air circulates at a low temperature, so that the temperature distribution in the entire freezer compartment 106 can be kept more uniform.

  Here, details regarding the suppression of the endothermic amount will be described.

  Generally, the amount Q of heat passing is expressed by the following equation.

Q = K * A * Δt K = 1 / (1 / αo + 1 / αi + 1 / λ)
(Q: heat passage amount, A: heat passage area, K: heat passage rate, Δt: temperature difference, αo: outer surface heat transfer rate, αi: storage room surface heat transfer rate, λ: heat insulation wall heat transfer rate ( Combined thermal conductivity of heat insulating material λ1, inner box resin λ2, and outer box steel plate λ3))
As in this embodiment, by providing a convex shape on the surface of the outer box 102 facing the cooling chamber 109 and making the shape of the outer box 102 surface an uneven shape, the flow direction of the updraft on the concave surface immediately after the convex shape As a result, the outer surface heat transfer coefficient αo becomes smaller and K becomes smaller, so that the amount of heat absorption can be suppressed.

  As described above, in the present embodiment, the heat insulating box body 101 includes the inner box 103 and the outer box 102, and the heat insulating box body 101 includes the heat insulating material between the inner box 103 and the outer box 102. A lower machine room 107 configured in the lower part, a compressor 108 installed in the lower machine room 107, a heat insulating door 119 for opening and closing the front face of the opening of the heat insulating box 101, a heat insulating box 101 and a heat insulating door 119, And a plurality of different temperature zone storage chambers 106 formed on the surface of the outer box 102 of the heat insulating box body 101 through which natural convection generated from the surface of the compressor 108 that is hotter than the outside air during operation flows. By providing the convex shape 129 that suppresses heat absorption from high-temperature natural convection, the amount of heat absorbed from the surface of the outer box 102 can be reduced, cooling efficiency can be improved, and a refrigerator with reduced power consumption can be provided. .

  Further, by having a convex shape toward the outside air on the surface of the outer box 102, a region where the flow velocity becomes slow behind the convex shape 129 can be obtained by performing simple processing without performing complicated processing. Since the heat transfer coefficient in the region where the flow rate is slowed down can be generated, the amount of heat absorbed from outside air can be suppressed, thereby improving the cooling efficiency and consequently reducing the power consumption. Can do.

  In addition, by providing a plurality of convex shapes 129 on the same surface of the outer box 102 surface, it is possible to generate more regions where the flow velocity is slower, and to further suppress the amount of heat absorbed from the surface of the outer box 102, thereby improving the cooling efficiency. A refrigerator with improved power consumption can be provided.

  Further, since the convex shape 129 is formed integrally with the surface of the outer box 102, no separate parts are required, it is very inexpensive, the number of assembling steps is not increased, and the rigidity strength of the outer box can be improved.

  Further, the convex shape 129 is the portion where the high-temperature natural convection generated by the operation of the compressor 108 reaches the surface of the outer box 102 earliest and the cooling chamber 109 having the lowest temperature in the refrigerator 100 is opposed to the outside. By providing it on the surface of the box 102, it is possible to suppress the amount of heat absorption at the portion where the temperature difference is most generated, and it is possible to further improve the cooling efficiency.

Specifically, as shown in FIG. 3, at least a part of the convex shape 129 includes an attachment surface (X portion) of the drain pan 114 provided at the lowermost part in the cooling chamber 109 and an installation position (Y portion) of the radiant heater 113. ).

  That is, the convex shape 129 is provided in the vicinity of the point where the natural convection begins to flow along the outer box 102 almost in parallel.

  Further, even if a convex shape 129 is provided on the surface of the outer box 102 facing the refrigerator compartment 104 in a storage room other than the freezer compartment 106, the same effect can be obtained.

  In the present embodiment, the convex shapes 129 are provided at a constant interval (equal pitch) with respect to the height direction of the outer box 102, but the intervals may be unequal pitches.

  In the present embodiment, the convex shape 129 is provided continuously in the width direction of the refrigerator 100, but is provided intermittently in the width direction of the refrigerator 100 (that is, the width direction of the refrigerator 100). There may be a portion where a convex shape is not provided.

  In this embodiment, the cooling means is cooled by forced convection, but may be cooled by natural convection (so-called direct cooling).

  The convex dimensions shown in this embodiment are examples, and the present invention is not limited to these dimensions.

(Embodiment 2)
FIG. 6 is a lower enlarged sectional view of the refrigerator in the second embodiment of the present invention.

  As shown in FIG. 6, a convex shape 129 is provided on the surface of the outer box 102 at the bottom of the refrigerator 100.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. In addition, description about the operation | movement / action similar to Embodiment 1 is abbreviate | omitted.

  Due to the natural convection generated by the operation of the compressor 108, the inside of the lower machine room 107 becomes negative pressure, so that the outside air at the bottom of the refrigerator 100 as shown by the broken line arrow in FIG. A flow occurs along the outer box 102 at the bottom of the bottom. By providing the convex shape 129 on the surface of the outer box 102 in a direction perpendicular to the flow, it is possible to generate a region where the flow velocity is slow behind the convex shape 129, and the heat transfer coefficient of the region where the flow velocity is slow is reduced. Therefore, the amount of heat absorption can be suppressed, thereby improving the cooling efficiency and consequently reducing the power consumption.

  In addition, since the cooling of the cold air can be suppressed, the cold air circulates at a low temperature, so that the temperature distribution in the entire freezer compartment 106 can be kept more uniform.

  Further, by having a convex shape toward the outside air on the surface of the outer box 102, a region where the flow velocity becomes slow behind the convex shape 129 can be obtained by performing simple processing without performing complicated processing. Since the heat transfer coefficient in the region where the flow rate is slowed down can be generated, the amount of heat absorbed from outside air can be suppressed, thereby improving the cooling efficiency and consequently reducing the power consumption. Can do.

In addition, by providing a plurality of convex shapes 129 on the same surface of the outer box 102 surface, it is possible to generate more regions where the flow velocity is slower, and to further suppress the amount of heat absorbed from the surface of the outer box 102, thereby improving the cooling efficiency. A refrigerator with improved power consumption can be provided.

  Further, since the convex shape 129 is formed integrally with the surface of the outer box 102, no separate parts are required, and it is very inexpensive and does not increase the number of assembly steps.

  In addition, the amount of heat absorption can be further suppressed by combining the provision of the convex shape in the outer box 102 shown in the first embodiment and the provision of the convex shape in the outer box 102 shown in the second embodiment. Thus, it is possible to provide a refrigerator with improved cooling efficiency and further reduced power consumption.

  As described above, the refrigerator according to the present invention can be applied to a household or commercial refrigerator or a vegetable storage.

100 Refrigerator 101 Heat insulation box 102 Outer box 103 Inner box 106 Freezer room (storage room)
107 Lower machine room 108 Compressor 117, 118, 119 Thermal insulation door 129 Convex shape

Claims (5)

An inner box and an outer box, and a heat insulating box provided with a heat insulating material between the inner box and the outer box; a lower machine room formed at a lower portion of the heat insulating box; and It is provided with an installed compressor, a heat insulating door that opens and closes the front surface of the opening of the heat insulating box, and a storage room having a plurality of different temperature zones formed by the heat insulating box and the heat insulating door. The refrigerator which provided the heat absorption suppression shape which suppresses the heat absorption from a high temperature natural convection in the said outer box surface of the said heat insulation box body in which the natural convection generate | occur | produced from the said compressor surface which becomes high temperature from outside air distribute | circulates. The refrigerator according to claim 1, wherein the endothermic suppression shape has a convex shape toward the outside air on the outer box surface of the heat insulating box. The refrigerator according to claim 2, wherein a plurality of the convex shapes are formed on the same surface of the outer box surface of the heat insulating box. The refrigerator according to claim 2 or 3, wherein the convex shape is provided in a direction perpendicular to a flow direction of natural convection generated from a surface of the compressor that is hotter than outside air during operation. The refrigerator according to any one of claims 2 to 4, wherein at least a part of the convex shape is provided on a surface of the outer box facing a storage chamber having a lowest set temperature in the storage chamber.