JP6854965B2 - refrigerator - Google Patents

Description

The present invention relates to a refrigerator, and more particularly to a defrosted water drainage structure and a vacuum heat insulating material installed between an inner box and an outer box of the refrigerator.

Many refrigerators and refrigerating systems equipped with vacuum heat insulating materials have been proposed. For example, Patent Document 1 proposes a configuration in which a vacuum heat insulating material is provided between an outer box and a defrosting pipe installed in a rigid urethane foam between the outer box and the inner box. By keeping the storage room warm with the vacuum heat insulating material, the operation of the cooler and the compressor is suppressed and the power consumption is suppressed.

Further, Patent Document 2 proposes a configuration in which a vacuum heat insulating material is provided between the inner box and the defrosting pipe, the pipe, etc. installed in the rigid urethane foam between the outer box and the inner box. .. By keeping the defrosted water warm with the vacuum heat insulating material, it is possible to prevent the defrosted water from being cooled and frozen due to the influence of the temperature in the storage chamber.

Japanese Unexamined Patent Publication No. 2005-164193 Japanese Unexamined Patent Publication No. 2004-101028

In the refrigerator of Patent Document 1, the heat insulating material can be used to keep the storage room warm, but there is a problem that the defrosted water is cooled and frozen due to the influence of the temperature in the storage room.

In the refrigerator of Patent Document 2, since the inner box for fixing the vacuum heat insulating material avoids interference with peripheral parts, the shape is complicated and it is difficult to secure the holding power of the adhesive material. In addition, there is a problem that it is necessary to install a plurality of small vacuum heat insulating materials in order to secure the heat insulating property.

The present invention has been made to solve the above problems, and is intended to prevent freezing of the defrosting pipe without impairing the heat insulating property and assembling property of the entire refrigerator.

The refrigerator according to the present invention has a box body having an inner box forming a storage chamber, an outer box outside the inner box and forming an outer frame, a cooler for generating cold air, and the cooling. A compressor for operating the machine, a drain pan for storing the defrost water generated by the cooler, a defrost pipe for flowing the defrost water to the drain pan, and a first vacuum heat insulating material fixed to the outer box. The second vacuum heat insulating material fixed to the inner box, the cooler, the compressor, and the defrosting pipe are located between the inner box and the outer box, and the second vacuum heat insulating material is installed between the defrosting pipe and the inner box, the dimensions than the first vacuum insulation material is rather small, and the defrosting pipe, the chiller of the accommodation cooling chamber A defrosting pipe cover that covers at least one of the joint portion and the joint portion between the defrosting pipe and the machine room in which the compressor and the drain pan are housed, and a defrosting pipe cover provided on the outer periphery of the defrosting pipe cover. A heater for defrosting piping is further provided, and a part of the heater for defrosting piping and another part of the heater for defrosting piping do not overlap in the normal direction of the heater for defrosting piping. Is.

According to the refrigerator according to the present invention, the first vacuum heat insulating material fixed to the outer box and the second vacuum heat insulating material fixed to the inner box are provided, and the second vacuum heat insulating material is made from the first vacuum heat insulating material. Is also reduced in size. Therefore, it is possible to prevent the defrosting pipe from freezing without impairing the heat insulating property and the assembling property of the entire refrigerator.

It is a front view of the refrigerator which concerns on Embodiment 1 of this invention. It is sectional drawing which looked at the side view of the refrigerator which concerns on Embodiment 1 of this invention. It is sectional drawing which looked at the side view of the refrigerator which concerns on Embodiment 2 of this invention. It is sectional drawing which looked at the periphery of the freezing chamber of the refrigerator which concerns on Embodiment 3 of this invention from the side. It is a figure which shows typically the cross section which looked at the side view of the refrigerator which concerns on Embodiment 4 of this invention. It is an enlarged view around the defrosting pipe of the refrigerator which concerns on Embodiment 4 of this invention. It is a perspective view of the defrosting pipe cover in which the heater for defrosting pipe is installed. It is a development view of the heater for defrosting piping.

Embodiment 1.
FIG. 1 is a front view of the refrigerator 1 according to the first embodiment of the present invention. As shown in FIG. 1, the refrigerator 1 is provided with a plurality of doors on the front surface, and is composed of a refrigerating room 100, a switching room 200, an ice making room 300, a vegetable room 400, and a freezing room 500. Each of these rooms is also referred to as a storage room. The refrigerator compartment 100 is provided with an opening / closing door 11 and is arranged at the top of the refrigerator 1. The switching chamber 200 can be switched between a freezing temperature zone of -18 ° C. and a soft freezing temperature zone of -7 ° C., includes a drawer door 12, and is arranged below the refrigerating chamber 100. The ice making chamber 300 includes a drawer door 13 and is arranged in parallel with the switching chamber 200. The vegetable compartment 400 is provided with a drawer door 14 and is arranged below the switching chamber 200 and the ice making chamber 300. The freezing room 500 includes a drawer door 15 and is arranged at the bottom of the refrigerator 1. The temperature of each storage chamber can be adjusted, for example, in the operation unit 10. The form of the refrigerator 1 may be one without the switching chamber 200 and the ice making chamber 300, and is not particularly limited.

FIG. 2 is a cross-sectional view of the refrigerator 1 according to the first embodiment of the present invention as viewed from the side. As shown in FIG. 2, the refrigerator 1 includes a box body 50 composed of an inner box 51 in which a storage chamber is formed and an outer box 52 outside the inner box 51 and forming an outer frame. A cooler 17, a compressor 19, and a blower fan 18 are also provided between the inner box 51 and the outer box 52 inside the refrigerator 1.

The first vacuum heat insulating material 54 is fixed to the outer box 52, and the second vacuum heat insulating material 55 is fixed to the inner box 51. Urethane foam 16 is filled between the inner box 51 and the outer box 52, and the first vacuum heat insulating material 54, the second vacuum heat insulating material 55, and the urethane foam 16 allow heat to enter each storage chamber. It is suppressed. The urethane foam 16 may be, for example, a rigid urethane foam.

The chiller 17 produces cold air that cools each storage chamber. A machine room 24 is formed between the inner box 51 and the outer box 52 located adjacent to the freezing chamber 500, and the compressor 19 is housed in the machine room 24. The cooler 17 is arranged above the machine room 24 in which the compressor 19 is arranged, and is operated by the compressor 19 to generate cold air. The cold air generated by the cooler 17 is sent to each storage chamber by the blower fan 18. The temperature of each storage chamber is detected by a thermistor (not shown) installed inside each storage chamber, and the opening degree of the damper (not shown), the output of the compressor 19, and the blower fan 18 are set so as to reach a preset temperature. It is controlled by adjusting the amount of air blown. A food shelf 20, a food storage case 21, and the like are also installed in each storage room to partition the storage space.

A defrost heater 22, a defrost pipe 53, and a drain pan 23 are provided between the cooler 17 and the compressor 19. The defrost heater 22 is arranged below the chiller 17 and melts the frost adhering to the chiller 17. The defrosting pipe 53 is a pipe through which defrost water is passed and leads from the lower part of the cooler 17 to the machine room 24. The drain pan 23 stores defrost water, is located at the lower part of the defrosting pipe 53, and is arranged on the upper surface of the compressor 19 or the like. The defrosting pipe 53 may be provided so as to connect the cooler 17 and the drain pan 23.

The first vacuum heat insulating material 54 arranged in the outer box 52 has a flat shape and covers the back surfaces of the refrigerating chamber 100, the switching chamber 200, the ice making chamber 300, and the vegetable compartment 400. The first vacuum heat insulating material 54 is not arranged between the outer box 52 and the machine room 24 adjacent to the freezing room 500. The first vacuum heat insulating material 54 is adhered to the outer box 52 with an adhesive or the like.

The second vacuum heat insulating material 55 arranged in the inner box 51 is located between the freezing chamber 500, the defrosting pipe 53, and the machine chamber 24. The second vacuum heat insulating material 55 has a smaller size than the first vacuum heat insulating material 54, and is arranged so that a part thereof is formed in a bent shape so as to follow the shape of the inner box 51. Here, the dimensions of the first vacuum heat insulating material 54 or the second vacuum heat insulating material 55 are the lengths of the second vacuum heat insulating material 55 in the vertical direction, the horizontal direction, and the thickness direction in the state before being bent, or. Refers to the surface area. The second vacuum heat insulating material 55 is adhered to an inner box 51 formed so as not to interfere with peripheral parts such as the defrosting pipe 53 and the machine room 24 with an adhesive or the like.

During the operation of the refrigerator 1, if the temperature around the cooler 17 becomes low, frost may adhere to the cooler 17. The frost adhering to the cooler 17 is melted by the defrost heater 22 to become defrost water. The defrost water passes through the defrost pipe 53 between the cooler 17 and the drain pan 23, and is stored in the drain pan 23 arranged on the upper surface of the compressor 19. Then, the defrosted water evaporates due to the heat of the compressor 19 and is discharged from the discharge port 25 provided in the machine room 24.

The defrosting pipe 53 through which the defrosting water passes is insulated from the low temperature freezing chamber 500 by the second vacuum heat insulating material 55 provided between the defrosting pipe 53 and the inner box 51. Therefore, it is possible to suppress the defrost water from being cooled by the influence of the temperature of the freezing chamber 500, and it is also possible to suppress the heat input from the compressor 19 and the outside air into the freezing chamber 500.

Since the first vacuum heat insulating material 54 is not provided between the defrosting pipe 53 and the machine room 24 and the outer box 52, the heat insulating property between the defrosting pipe 53 and the machine room 24 and the outside air becomes low. There is. Therefore, it becomes easy to release the heat of the compressor 19 arranged in the machine room 24 to the outside of the refrigerator 1 and improve the heat input from the outside air to the defrosting pipe 53.

Since the first vacuum heat insulating material 54 has a large size and a flat shape, it is easy to fix, and since the adhesive surface is wide, the adhesive force can be maintained. Since the second vacuum heat insulating material 55 is smaller in size than the first vacuum heat insulating material 54, the weight is also smaller, and even when the contact area between the second vacuum heat insulating material 55 and the inner box 51 is large and difficult to obtain, it is peeled off due to aging or the like. Is prevented.

The refrigerator 1 according to the first embodiment described above is arranged between the first vacuum heat insulating material 54 fixed to the outer box 52, the inner box 51 and the defrosting pipe 53, and is arranged between the first vacuum heat insulating material 54. It is provided with the second vacuum heat insulating material 55 having a smaller size than that. Therefore, the adhesion between the first vacuum heat insulating material 54 and the second vacuum heat insulating material 55 can be ensured. In addition, heat input from the outside air to each storage chamber is suppressed. Further, since the first vacuum heat insulating material 54 is not provided between the defrosting pipe 53 and the machine room 24 and the outer box 52, the heat generated from the compressor 19 can be efficiently released to the outside of the refrigerator 1. Therefore, the heat input from the outside air to the defrosting pipe 53 is improved, and the freezing of the defrosting water can be suppressed.

Further, since the second vacuum heat insulating material 55 is located between the inner box 51 and the defrosting pipe 53, the defrosting water flowing through the defrosting pipe 53 is cooled and frozen due to the influence of the temperature of the freezing chamber 500. It is possible to suppress the frost.

Further, since the second vacuum heat insulating material 55 is located between the inner box 51 and the machine room 24 in which the compressor 19 is arranged, heat input from the compressor 19 and the outside air to the freezer room 500 is suppressed. The power consumption of the refrigerator 1 can be suppressed.

Further, by forming the second vacuum heat insulating material 55, which is smaller than the first vacuum heat insulating material 54, into a bent shape that follows the shape of the machine room 24, it is formed so as not to interfere with peripheral parts such as the defrosting pipe 53 and the machine room 24. The contact surface with the inner box 51 can be increased. Therefore, the adhesive force between the second vacuum heat insulating material 55 and the inner box 51 can be improved, and the peeling of the second vacuum heat insulating material 55 due to aging or the like can be prevented. Further, since it is not necessary to divide the second vacuum heat insulating material 55 into a plurality of parts, it is possible to improve the covering ratio and the heat insulating property, and it is also possible to suppress the deterioration of workability.

Further, the first vacuum heat insulating material 54 is not located between the outer box 52 and the compressor 19, but also is not located between the outer box 52 and the defrosting pipe 53. Therefore, the heat generated from the compressor 19 is efficiently released to the outside of the refrigerator 1, and the power consumption of the refrigerator 1 can be suppressed.

Embodiment 2.
FIG. 3 is a cross-sectional view of the refrigerator 1 according to the second embodiment of the present invention as viewed from the side. The basic configuration is the same as that of the first embodiment, but the configuration of the defrosting pipe 53 and the first vacuum heat insulating material 54 is different from that of the first embodiment.

As shown in FIG. 3, the defrosting pipe 53 of the refrigerator 1 according to the second embodiment is provided with a defrosting pipe heater 56 on the inner surface, which is energized according to the operating state of the refrigerator 1 and the surrounding environment. The defrosting pipe heater 56 is preferably fixed to the defrosting pipe 53.

The first vacuum heat insulating material 54 covers the backs of the refrigerating chamber 100, the switching chamber 200, the ice making chamber 300, and the vegetable compartment 400, and is attached to the outer box 52 so as to reach between the defrosting pipe 53 and the outer box 52. It is fixed. However, the first vacuum heat insulating material 54 does not cover the machine room 24 where the compressor 19 is located.

The frost adhering to the cooler 17 is melted by the defrosting heater 22 and reaches the defrosting pipe 53 as defrosting water, and the defrosting pipe 53 is heated by the defrosting pipe heater 56 provided in the defrosting pipe 53. Water is stored in the drain pan 23 through. Then, the defrosted water evaporates due to the heat of the compressor 19 and is discharged to the outside.

By providing the defrosting pipe heater 56, the heat input to the defrosting pipe 53 is improved. As a result, even when the defrosting pipe 53 becomes cold due to the cold air from each storage, the defrosting water is prevented from being cooled and frozen in the defrosting pipe 53.

Further, the first vacuum heat insulating material 54 is arranged between the defrosting pipe 53 and the outer box 52, and the defrosting pipe 53 and the outside air are insulated. Therefore, it is possible to prevent the heat of the defrosting pipe heater 56 from being efficiently input to the defrosting water and being dissipated to the outside air.

The refrigerator 1 according to the second embodiment described above includes a heater 56 for defrosting pipes fixed to the defrosting pipe 53, and the first vacuum heat insulating material 54 is between the defrosting pipe 53 and the outer box 52. positioned. As a result, heat dissipation from the defrosting pipe heater 56 to the outside air is suppressed, and heat is efficiently input to the defrosting water of the defrosting pipe 53, so that power consumption can be suppressed.

Further, since the first vacuum heat insulating material 54 is not located between the outer box 52 and the compressor 19, the heat generated from the compressor 19 can be efficiently discharged to the outside of the refrigerator 1, so that the power consumption of the refrigerator 1 is consumed. Can be suppressed.

Embodiment 3.
FIG. 4 is a cross-sectional view of the periphery of the freezing chamber 500 of the refrigerator 1 according to the third embodiment of the present invention as viewed from the side. The basic configuration is the same as that of the first embodiment, but the shape of the second vacuum heat insulating material 55 is different from that of the first embodiment.

As shown in FIG. 4, in the refrigerator 1 according to the third embodiment of the present invention, the first concave shape 55a and the second concave shape 55b are formed on the second vacuum heat insulating material 55.

The first concave shape 55a of the second vacuum heat insulating material 55 is formed on the contact surface with the inner box 51. A convex shape 51a is formed in the inner box 51 in which the second vacuum heat insulating material 55 is arranged, the convex shape 51a and the first concave shape 55a are engaged with each other, and the second vacuum heat insulating material 55 is formed in the inner box 51. Is fixed.

The second concave shape 55b of the second vacuum heat insulating material 55 is formed on the surface opposite to the contact surface with the inner box 51. The second concave shape 55b is provided at a position where the inner box 51 and the machine room 24 are close to each other. The first concave shape 55a and the second concave shape 55b are provided apart so as not to overlap on the projection surface.

The second vacuum heat insulating material 55 is arranged along the inner box 51 in which the convex shape 51a is formed. Then, the first concave shape 55a of the second vacuum heat insulating material 55 and the convex shape 51a formed on the inner box 51 are engaged with each other to position the second vacuum heat insulating material 55. Then, in that state, the second vacuum heat insulating material 55 and the inner box 51 are adhered and fixed by an adhesive or the like.

In the second vacuum heat insulating material 55 fixed to the inner box 51, the surface opposite to the contact surface with the inner box 51 is covered with urethane foam 16. The second concave shape 55b provided on the second vacuum heat insulating material 55 serves as a flow path for the urethane foam 16 and improves the flowability, so that the urethane foam 16 is evenly filled.

In the configuration of the first concave shape 55a and the second concave shape 55b of the third embodiment, the configuration of the defrost piping heater 56 of the second embodiment may be combined.

In the refrigerator 1 according to the third embodiment described above, the second vacuum heat insulating material 55 has the first concave shape 55a on the contact surface with the inner box 51. Therefore, the contact surface between the second vacuum heat insulating material 55 and the inner box 51 can be increased. Further, since the first concave shape 55a can be used as a reference for the fixed position of the second vacuum heat insulating material 55 with respect to the inner box 51, positioning during the bonding work becomes easy, and the second vacuum heat insulating material 55 has the planned dimensions. It can be installed accurately on the street.

Further, the second vacuum heat insulating material 55 has a second concave shape 55b on a surface opposite to the contact surface with the inner box 51. Therefore, the second vacuum heat insulating material 55 and the machine room 24 are prevented from interfering with each other or being extremely close to each other at a position where they are close to each other, and a sufficient flow path of the urethane foam 16 is secured. As a result, the flowability and filling property of the urethane foam 16 are improved, the heat effect from the machine room 24 to the freezing room 500 is reduced, and power consumption can be suppressed.

Further, the first concave shape 55a and the second concave shape 55b are formed at distant positions that do not overlap on the projection surface. Therefore, the second vacuum heat insulating material 55 is extremely thin to prevent the heat insulating property from being impaired, and the mounting workability of the second vacuum heat insulating material 55, the flowability of the urethane foam 16, and the filling property are improved. Can be improved.

Further, the convex shape 51a formed on the inner box 51 is engaged with the first concave shape 55a formed on the contact surface with the second vacuum heat insulating material 55, which further facilitates the positioning during the bonding work. be able to.

Embodiment 4.
FIG. 5 is a diagram schematically showing a cross section of the refrigerator 1 according to the fourth embodiment of the present invention as viewed from the side, and FIG. 6 is a defrosting pipe 53 of the refrigerator 1 according to the fourth embodiment of the present invention. It is an enlarged view of the surroundings. The basic configuration of the fourth embodiment is the same as that of the first to third embodiments, but the configuration around the defrosting pipe 53 is different from that of the first to third embodiments.

As shown in FIGS. 5 and 6, the refrigerator 1 according to the fourth embodiment of the present invention includes the first vacuum heat insulating material 54 provided in the outer box 52 and the second vacuum heat insulating material 55 provided in the inner box 51. A defrosting pipe cover 58 is provided on the outer peripheral side of the defrosting pipe 53 located between the two. The defrosting pipe cover 58 has a cylindrical shape, and a defrosting pipe heater 56 is arranged on the outer periphery thereof. The defrosting pipe cover 58 and the defrosting pipe heater 56 are located between the first vacuum heat insulating material 54 and the second vacuum heat insulating material 55. The defrosting pipe cover 58 and the heater 56 for defrosting pipes are made of urethane filled between the defrosting pipe 53 and the first vacuum heat insulating material 54 and between the defrosting pipe 53 and the second vacuum heat insulating material 55. Surrounded by form 16.

The defrosting pipe cover 58 is located above the defrosting pipe 53 and is arranged so as to cover the joint portion 53a between the defrosting pipe 53 and the cooling chamber 57 accommodating the cooler 17 and the defrosting heater 22 inside. ing. Further, the defrosting pipe cover 58 is arranged so as to cover the joint portion 53b between the defrosting pipe 53 and the machine room 24 located below the defrosting pipe 53.

The drain water generated in the cooling chamber 57 passes through the defrosting pipe 53 from the lower part of the cooling chamber 57 and is stored in the drain pan 23 arranged in the machine chamber 24. At this time, if there is a gap at the joint portion 53a between the cooling chamber 57 and the defrosting pipe 53 or the joint portion 53b between the defrosting pipe 53 and the machine room 24, drain water may leak from the gap. Even in such a case, since the joint portion 53a and the outside of the joint portion 53b are covered with the defrosting pipe cover 58, the drain water does not infiltrate into the urethane foam 16.

In FIG. 6, the defrosting pipe cover 58 is shown as one member that covers the joint portion 53a between the defrosting pipe 53 and the cooling chamber 57 and the joint portion 53b between the defrosting pipe 53 and the machine room 24. ing. The defrosting pipe cover 58 is not limited to the illustrated configuration, and the defrosting pipe cover 58 includes, for example, a member covering the joint portion 53a between the defrosting pipe 53 and the cooling chamber 57, and the defrosting pipe 53 and the machine room 24. It may be composed of two members, that is, a member that covers the joint portion 53b with and.

Further, the defrosting pipe cover 58 may be configured to cover either the joint portion 53a between the defrosting pipe 53 and the cooling chamber 57 or the joint portion 53b between the defrosting pipe 53 and the machine room 24. .. As a result, it is possible to prevent drain water from entering the urethane foam 16 from the joint portion 53a or the joint portion 53b.

Further, the defrosting pipe cover 58 may be configured to cover both the joint portion 53a and the joint portion 53b. As a result, the infiltration of drain water into the urethane foam 16 can be more reliably suppressed.

FIG. 7 is a perspective view of the defrosting pipe cover 58 in which the defrosting pipe heater 56 is installed, and FIG. 8 is a developed view of the defrosting pipe heater 56.

As shown in FIGS. 7 and 8, the defrosting pipe heater 56 is composed of a heater wire 56a and a sheet-shaped aluminum plate 56b, and is wound around a cylindrical defrosting pipe cover 58. The defrosting pipe heater 56 is provided so that one surface of the aluminum plate 56b is in contact with the outer peripheral surface of the defrosting pipe cover 58.

The heater wire 56a is bent and is arranged over the entire surface of the other surface of the aluminum plate 56b, that is, the surface of the defrosting pipe cover 58 that is not in contact with the outer peripheral surface. In the heater wire 56a, a part of the heater wire 56a and another part of the heater wire 56a do not overlap in the normal direction of the aluminum plate 56b.

The aluminum plate 56b is placed on the outer peripheral surface of the defrosting pipe cover 58 so that one set of facing sides is along the circumferential direction of the defrosting pipe cover 58 and the other pair of sides is along the axial direction of the defrosting pipe cover 58. It is wrapped. The dimensions of the pair of sides of the aluminum plates 56b facing each other are smaller by the dimension A in FIG. 7 than the dimensions of the defrosting pipe cover 58 in the circumferential direction. One of the other set of sides of the aluminum plate 56b does not overlap with the other of the other set of sides of the aluminum plate 56b when the defrosting pipe heater 56 is wound around the defrosting pipe cover 58. The dimension A is a dimension in which one of the other set of sides of the aluminum plate 56b and the other of the other set of sides do not overlap, and is a value larger than at least zero. The dimension A should be at least smaller than the half circumference of the defrosting pipe cover 58, and should be as small as possible.

By winding the defrosting pipe heater 56 around the outer circumference of the defrosting pipe cover 58 in this way, the drain water is blocked by the defrosting pipe cover 58, and contact between the drain water and the defrosting pipe heater 56 is prevented. To.

As described above, the defrost piping heater 56 is arranged so that the heater wires 56a do not overlap with each other, and when the heater wires 56a are wound around the defrost piping cover 58, the aluminum plate 56b becomes the aluminum 56 plate b. It does not overlap with each other. As a result, the local temperature rise of the defrosting pipe cover 58 is suppressed, and the defrosting pipe cover 58 is prevented from being deformed or melted by heat.

The defrost piping heater 56 maintains the dimension A in which the dimension of a set of sides facing the defrost piping cover 58 in the circumferential direction is the difference from the dimension in the circumferential direction of the defrost piping cover 58, and Dimension A is made as small as possible. As a result, the contact area between the defrosting pipe heater 56 and the defrosting pipe cover 58 becomes wide, and it is possible to efficiently heat the defrosting pipe cover 58 and the defrosting pipe 53 from the defrosting pipe heater 56. Become.

The defrosting pipe heater 56 is arranged between the first vacuum heat insulating material 54 and the second vacuum heat insulating material 55 together with the defrosting pipe cover 58 and the defrosting pipe 53, and the heat of the defrosting pipe heater 56 is generated. It is hard to be released to the outside. Therefore, it is possible to efficiently heat the defrosting pipe cover 58 and the defrosting pipe 53 from the defrosting pipe heater 56. The heater 56 for defrosting piping may be adopted in a configuration in which the first vacuum heat insulating material 54 is not provided in the outer box 52, but the one provided with the first vacuum heat insulating material 54 is for defrosting piping. The heat of the heater 56 can be more reliably suppressed from being released to the outside.

According to the refrigerator 1 according to the fourth embodiment described above, the joint portion 53a between the cooling chamber 57 and the defrost pipe 53 and the joint portion 53b between the defrost pipe 53 and the machine room 24 are the defrost pipe covers. Covered by 58. Therefore, even when drain water leaks from the joint portion 53a or the joint portion 53b, deterioration of the heat insulating performance due to water immersion of the urethane foam 16 can be suppressed, and deformation due to swelling of the urethane foam 16 can be prevented.

Further, since the defrosting pipe heater 56 is provided on the outer periphery of the defrosting pipe cover 58, the drain water is blocked by the defrosting pipe cover 58 even if the drain water leaks from the joint portion 53a and the joint portion 53b. It is prevented from coming into contact with the defrost piping heater 56. Therefore, it is not necessary to apply waterproofing measures to the defrosting pipe heater 56, and it is possible to propose an inexpensive and highly safe refrigerator 1 while suppressing freezing of the defrosting pipe 53.

The defrosting pipe cover 58 and the defrosting pipe heater 56 of the fourth embodiment may be combined with the configurations of the first to third embodiments.

1 Refrigerator, 10 Operation unit, 11 Open / close door, 12, 13, 14, 15 Drawer door, 16 Urethane foam, 17 Cooler, 18 Blower fan, 19 Compressor, 20 Food shelf, 21 Food storage case, 22 Defrost heater , 23 drain pan, 24 machine room, 25 outlet, 50 box body, 51 inner box, 51a convex shape, 52 outer box, 53 defrost piping, 53a, 53b joint, 54 first vacuum insulation, 55 second vacuum Insulation material, 55a 1st concave shape, 55b 2nd concave shape, 56 Defrosting piping heater, 56a heater wire, 56b aluminum, 57 cooling room, 58 defrosting piping cover, 100 refrigerating room, 200 switching room, 300 ice making room , 400 vegetable room, 500 freezer room.

Claims (11)

A box body having an inner box forming a storage chamber and an outer box outside the inner box and forming an outer frame.
A chiller that produces cold air and
The compressor that operates the cooler and
A drain pan that stores the defrosted water generated by the cooler, and
A defrosting pipe that allows the defrosting water to flow to the drain pan,
The first vacuum heat insulating material fixed to the outer box and
The second vacuum heat insulating material fixed to the inner box is provided.
The cooler, the compressor, and the defrosting pipe are located between the inner box and the outer box.
The second vacuum heat insulating material is
Installed between the inner box and the defrosting pipe,
Rather small dimensions than the first vacuum heat insulating material,
At least one of the joint between the defrosting pipe and the cooling chamber in which the cooler is housed, and the joint between the defrosting pipe and the machine room in which the compressor and the drain pan are housed. Defrosting piping cover to cover and
A heater for defrosting piping provided on the outer periphery of the defrosting piping cover is further provided.
A refrigerator in which a part of the defrosting pipe heater and the other part of the defrosting pipe heater do not overlap in the normal direction of the defrosting pipe heater. The second vacuum heat insulating material is installed between the inner box and the compressor.
The refrigerator according to claim 1. The second vacuum heat insulating material is installed along the outside of the inner box,
The refrigerator according to claim 1 or 2. The second vacuum heat insulating material has a bent shape that follows the shape of the inner box.
The refrigerator according to any one of claims 1 to 3. The first vacuum heat insulating material is not located between the outer box and the defrosting pipe.
The refrigerator according to any one of claims 1 to 4. A heater fixed to the defrosting pipe is provided.
The first vacuum heat insulating material is located between the outer box and the defrosting pipe.
The refrigerator according to any one of claims 1 to 4. The first vacuum heat insulating material is not located between the outer box and the compressor.
The refrigerator according to any one of claims 1 to 6. The second vacuum heat insulating material has a first concave shape on the contact surface with the inner box.
The refrigerator according to any one of claims 1 to 7. The second vacuum heat insulating material has a second concave shape on the surface opposite to the contact surface with the inner box.
The refrigerator according to any one of claims 1 to 8. The second vacuum heat insulating material is
The contact surface with the inner box has a first concave shape and has a first concave shape.
It has a second concave shape on the surface opposite to the contact surface with the inner box.
The first concave shape and the second concave shape do not overlap on the projection surface.
The refrigerator according to any one of claims 1 to 7. The inner box has a convex shape formed on a contact surface with the second vacuum heat insulating material.
The first concave shape and the convex shape are engaged with each other.
The refrigerator according to claim 10.

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