JP2024075862A - refrigerator - Google Patents

Abstract

To provide a refrigerator capable of improving power saving performance by suppressing unevenness of air flow rate between two radiators constituting a machine room condenser and increasing an amount of heat radiation.SOLUTION: A refrigerator includes: a machine room 7 formed in a manner of extending in a lateral direction when seen from the side of an opening/closing door; a low ventilation resistance opening portion 19 formed on a side surface in the lateral direction of the refrigerator connected to the machine room 7; a high ventilation resistance opening portion 17b formed in a bottom surface on a lower side of the refrigerator connected to the machine room and having a ventilation resistance higher than that of the low ventilation resistance opening portion 19; a high ventilation resistance radiator 71a lying opposite the low ventilation resistance opening portion 19 and radiating heat with air that is mainly taken from the low ventilation resistance opening portion 19; and a low ventilation resistance radiator 71b lying opposite the high ventilation resistance opening portion 17b, radiating heat with air that is mainly taken from the high ventilation resistance opening portion 17b, and having a ventilation resistance lower than the high ventilation resistance radiator 71a.SELECTED DRAWING: Figure 6

Description

The present invention relates to refrigerators for storing food and beverages, and in particular to refrigerators with a heat exchanger located in the machine compartment.

In recent refrigerators, storage compartments such as the refrigerator compartment at the top of the box, the freezer compartment (or vegetable compartment) in the middle, and the vegetable compartment (or freezer compartment) at the bottom are arranged inside the refrigerator, and the storage compartments are divided by insulated partition walls to minimize heat transfer. In addition, intermediate cooling refrigerators (refrigerators that use a fan to blow cold air cooled by a cooler into the freezer, refrigerator, and vegetable compartment), which are the most common type of refrigerator, are equipped with a refrigeration cycle that generates cold air inside the refrigerator, and the cold air generated by the cooler in this refrigeration cycle is circulated by a blower to each storage compartment to cool the stored items.

The compressor that compresses the refrigerant that constitutes the refrigeration cycle and the machine room condenser that exchanges heat between the compressed refrigerant and the air are located in a machine room provided at the bottom of the refrigerator. Regarding heat dissipation from the machine room condenser provided in the machine room of a refrigerator, for example, the technology described in JP 2003-42636 A (Patent Document 1) is known.

The machine compartment described in Patent Document 1 is formed as a roughly rectangular parallelepiped space on the rear side of the refrigerator when viewed from the front (the opening and closing door side) of the refrigerator, with the left-right width dimension being longer than the top-to-bottom dimension. In addition, a bottom suction port is provided on the bottom of the machine compartment, and a side suction port is provided on the side of the machine compartment.

In the machine room, the compressor and the machine room condenser are arranged side by side in the width direction on the left and right. The machine room condenser is formed in a roughly L-shape with a horizontal radiator that is roughly parallel to the floor on which the house is installed and a vertical radiator that is roughly perpendicular to this. When the machine room blower is operated, the air sucked into the machine room from the bottom suction port mainly exchanges heat with the horizontal radiator of the machine room condenser, and the air sucked into the machine room from the side suction port mainly exchanges heat with the vertical radiator of the machine room condenser.

By adopting this configuration, the machine room condenser can be made larger in the width direction, improving storage efficiency. This means that a large machine room condenser can be stored in a small machine room, increasing the amount of heat dissipation.

JP 2003-42636 A

In the configuration of Patent Document 1, the air sucked into the machine room from the bottom suction port mainly flows into the horizontal radiator of the machine room condenser, and the air sucked into the machine room from the rear suction port mainly flows into the vertical radiator of the machine room condenser.

However, rear air inlets are often placed close to the walls of houses, which is expected to increase ventilation resistance and reduce heat dissipation efficiency. For this reason, it is considered to provide a side air inlet on the side of the refrigerator.

However, because refrigerators are installed with a narrow gap between them and the floor of a house, the ventilation resistance of the bottom suction port of the refrigerator is greater than the ventilation resistance of the side suction port of the refrigerator. Therefore, if the ventilation resistance between the bottom suction port and the side suction port is uneven, the air flow rate will be uneven between the horizontal and vertical radiators of the machine room condenser, resulting in a problem of reduced heat dissipation efficiency.

Even if a rear suction port is provided on the rear side as in Patent Document 1, the refrigerator is placed close to the wall of the house, so the ventilation resistance of the rear suction port of the refrigerator is larger than the ventilation resistance of the side suction port of the refrigerator, resulting in the same problem.

In addition, the above description refers to a horizontal radiator and a vertical radiator for the machine room condenser, but the same issues arise with any system that has two radiators, not just vertical and horizontal radiators.

The present invention aims to provide a refrigerator that can suppress the bias in the air flow rate between the two radiators that make up the machine room condenser, improve heat dissipation efficiency, and enhance power saving performance.

In order to solve the above problems, the present invention employs the configuration described in the claims, for example, and is characterized in that the refrigerator includes at least a storage compartment for storing food and beverages, an opening and closing door provided in the storage compartment, and a machine compartment in which a radiator for exchanging heat between the refrigerant compressed by the compressor and the air is disposed, the refrigerator includes a machine compartment formed to extend in the left-right direction when viewed from the opening and closing door side, a low ventilation resistance opening formed on one side of the refrigerator in the left-right direction connected to the machine compartment, a high ventilation resistance opening formed on the bottom surface in the downward direction or the back surface in the rear direction connected to the machine compartment and having a higher ventilation resistance than the low ventilation resistance opening, a high ventilation resistance radiator facing the low ventilation resistance opening and dissipating heat mainly with air taken in from the low ventilation resistance opening, and a low ventilation resistance radiator facing the high ventilation resistance opening and dissipating heat mainly with air taken in from the high ventilation resistance opening and having a lower ventilation resistance than the high ventilation resistance radiator.

According to the present invention, it is possible to provide a refrigerator with high power-saving performance that suppresses the bias of the air flow rate between the two radiators of the machine room condenser and improves the heat dissipation efficiency. The problems, configurations, and effects other than those described above will be made clear by the description of the following embodiment.

1 is a front view of a refrigerator according to a first embodiment of the present invention. FIG. 2 is a rear view of the refrigerator of FIG. 1 . FIG. 2 is a vertical cross-sectional view of the refrigerator of FIG. 1 . FIG. 2 is a front view showing the configuration of the interior of the refrigerator in FIG. 1. FIG. 2 is a configuration diagram of a refrigeration cycle of the refrigerator of FIG. 1. FIG. 2 is a rear view showing the configuration of the machine compartment of the refrigerator in FIG. 1 . FIG. 2 is a top view showing the configuration of a machine chamber base of the refrigerator of FIG. 1 . FIG. 2 is a perspective view showing a configuration of an external radiator of the refrigerator of FIG. 1 . FIG. 11 is a perspective view showing a configuration of an external radiator of a refrigerator according to a second embodiment of the present invention.

The following describes in detail an embodiment of the present invention with reference to the drawings. However, the present invention is not limited to the following embodiment, and the scope of the present invention includes various modifications and applications within the technical concept of the present invention.

The following describes an embodiment of the present invention with reference to Figs. 1 to 9. In the following description, when the refrigerator 1 is viewed from the front (the side where the door opens and closes), the right side is the right direction and the left side is the left direction.

A refrigerator 1 according to a first embodiment of the present invention will be described with reference to FIG. 1. FIG. 1 is a front view of a refrigerator 1 according to a first embodiment of the present invention.

As shown in FIG. 1, the insulated box 10 of the refrigerator 1 has storage compartments, in this order from above: a refrigerator compartment 2, an ice-making compartment 3 on the left and right, an upper freezer compartment 4, a lower freezer compartment 5, and a vegetable compartment 6. Therefore, the exterior of the refrigerator 1 is composed of the insulated box 10 and doors that open and close each of the storage compartments, which will be described later.

The refrigerator 1 is equipped with doors that open and close the openings of each storage compartment. These doors are rotating refrigerator compartment doors 2a and 2b, which are divided into left and right doors and open the opening of the refrigerator compartment 2, and pull-out ice-making compartment door 3a, upper freezer compartment door 4a, lower freezer compartment door 5a, and vegetable compartment door 6a, which open and close the openings of the ice-making compartment 3, upper freezer compartment 4, lower freezer compartment 5, and vegetable compartment 6, respectively. The interior material of these multiple doors is mainly composed of urethane foam. In addition, each door is equipped with a sealing member (not shown) on the inner periphery.

The refrigerator compartment 2 is separated from the ice-making compartment 3 and the upper freezer compartment 4 by a heat-insulating partition wall 27, and the lower freezer compartment 5 is separated from the vegetable compartment 6 by a heat-insulating partition wall 28. In addition, a partition 29 is provided at the front edge between the ice-making compartment 3 and the upper freezer compartment 4 at a position that abuts against the seal member on the inner right end of the ice-making compartment door 3a and the seal member on the inner left end of the upper freezer compartment door 4a when the ice-making compartment door 3a and the upper freezer compartment door 4a are closed.

At the front edge between the ice-making compartment 3 and the upper freezer compartment 4 and the lower freezer compartment 5, a partition 30 is provided at a position that abuts the seal members on the inner bottom ends of the ice-making compartment door 3a and the upper freezer compartment door 4a and the seal member on the inner top end of the lower freezer compartment door 5a when the ice-making compartment door 3a, the upper freezer compartment door 4a, and the lower freezer compartment door 5a are closed.

Door hinges (not shown) for fixing the refrigerator 1 to the doors 2a and 2b are provided at the front of the outer top compartment of the insulated box body 10 and at the front edge of the insulated partition wall 27, and the upper door hinge provided on the outer top compartment is covered with a door hinge cover 16.

The ice-making compartment 3, upper freezer compartment 4, and lower freezer compartment 5 are basically storage compartments whose interiors are kept at a freezing temperature (below 0°C), for example, on average around -18°C, while the refrigerator compartment 2 is a storage compartment whose interiors are kept at a refrigeration temperature (above 0°C), for example, on average around 4°C, and the vegetable compartment 6 is a storage compartment whose interiors are kept at a refrigeration temperature (above 0°C), for example, on average around 7°C. Hereinafter in this specification, the ice-making compartment 3, upper freezer compartment 4, and lower freezer compartment 5, which are storage compartments kept at freezing temperatures, may be collectively referred to as freezer compartment 60.

Figure 2 is a rear view of the refrigerator 1 in Figure 1. The refrigerator 1 has a machine room 7 behind the vegetable room 6, which houses the compressor 24 and external radiator 71, which are components of the refrigeration cycle, as described below. The machine room 7 has a machine room base 17 at the bottom and a machine room cover 18 at the rear, and the machine room 7 is surrounded by the insulated box body 10, the outer box 10a, the machine room base 17, and the machine room cover 18.

The machine room cover 18 has a machine room cover opening 18a for discharging air from the machine room 7, and a control board case 31 for the refrigerator 1 is provided in front of the machine room cover 18 so as to be adjacent to the machine room cover 18. The control board case 31 contains a board, which is an electrical component that controls the operation of the refrigerator 1.

Figure 3 is a vertical cross-sectional view of the refrigerator 1 in Figure 1, and a cross-sectional view taken along the line A-A in Figure 1. Figure 4 is a front view showing the configuration of the interior of the refrigerator 1 in Figure 1, and is a front view of the refrigerator 1 in Figure 1 with the door and containers removed. The configuration of the refrigerator 1 will be described with reference to Figures 3 and 4.

As shown in FIG. 3, the inside and outside of the refrigerator 1 are separated by an insulated box 10 formed by filling a foam insulation material (urethane foam in the refrigerator of this embodiment) between an outer box 10a made of steel plate and an inner box 10b made of synthetic resin (e.g., ABS resin).

In addition to the foam insulation material, vacuum insulation material 25, which has a lower thermal conductivity than the foam insulation material, is installed between the outer box 10a and the inner box 10b in the insulated box 10 to prevent a decrease in internal volume and improve insulation performance. In this embodiment, vacuum insulation material 25 is installed on the back, top, bottom, and both sides of the insulated box 10, and on the lower freezer door 5a.

The insulating material inside the insulating partition wall 27 is expanded polystyrene, and the inside of the insulating partition wall 28 is filled with urethane foam as an insulating material. The urethane foam inside the insulating partition wall 28 is filled together with the urethane foam of the insulating box 10 in the process of foaming and filling the space between the outer box 10a and the inner box 10b of the insulating box 10 with urethane.

The refrigerator compartment doors 2a and 2b are provided with multiple door pockets 33a, 33b, and 33c on the inside of the compartment. The refrigerator compartment 2 is also divided into multiple storage spaces by shelves 34a, 34b, 34c, and 34d. The ice-making compartment door 3a, the upper freezer compartment door 4a, the lower freezer compartment door 5a, and the vegetable compartment door 6a are each provided with an ice-making compartment container 3b, an upper freezer compartment container 4b, a lower freezer compartment container 5b, and a vegetable compartment container 6b, which are pulled out as a unit.

The rear of the refrigerator compartment 2 is provided with a refrigerator compartment air duct 131 housing a fin-tube type refrigerator compartment cooler 14a, and the refrigerator compartment air duct 131 (see FIG. 4) is provided with a refrigerator compartment fan 9a. The refrigerator compartment air duct 131 is provided with an upper refrigerator compartment outlet 111a and a lower refrigerator compartment outlet 111b that blow cold air into the refrigerator compartment 2 in front.

At the lower front of the refrigerator compartment air passage 131, a refrigerator compartment return air passage 115 is formed through which the return cold air from the refrigerator compartment 2 flows. The refrigerator compartment return air passage 115 is formed with a width approximately equal to the width of the refrigerator compartment cooler 14a, so that the return cold air from the refrigerator compartment 2 flows efficiently into the refrigerator compartment cooler 14a.

The refrigerator 1 is provided with a cooler chamber 8 that houses a fin-tube type freezer cooler 14b at the rear of the lower freezer chamber 5, and a freezer chamber fan 9b at the top of the cooler chamber 8. Downstream of the freezer chamber fan 9a is a freezer chamber air duct 100 through which the cold air blown into the freezer chamber 60 flows.

The freezer compartment air duct 100 is connected to the vegetable compartment air duct 132 that extends vertically, and the bottom of the vegetable compartment air duct 132 is provided with a vegetable compartment damper 160 (see FIG. 4) as a means for adjusting the air volume (air volume adjustment means). The freezer compartment air duct 100 is provided with an ice compartment outlet (ice compartment outlet) 101 that blows cold air to the ice compartment 3 in the front, the upper freezer compartment 4, and the lower freezer compartment 5, an upper freezer outlet (upper freezer outlet) 102, and a lower freezer outlet (lower freezer outlet) 103.

At the lower front of the cooler chamber 8, a freezer chamber return air duct 105 is formed through which the return cold air from the ice-making chamber 3, the upper freezer chamber 4, and the lower freezer chamber 5 flows. The freezer chamber return air duct 105 is formed with a width approximately equal to the width of the freezer chamber cooler 14b, allowing the return cold air from the freezer chamber 60 to flow efficiently into the freezer chamber cooler 14b.

The outlet of the vegetable compartment air duct 132 is equipped with a vegetable compartment outlet 133. A vegetable compartment return port 136 opens on the underside of the insulated partition wall 28 between the lower freezer compartment 5 and the vegetable compartment 6, and a vegetable compartment return air duct 135 is provided inside the insulated partition wall 28, running from the vegetable compartment return port 136 to the lower front of the cooler compartment 8.

A refrigerator compartment temperature sensor 41, a freezer compartment temperature sensor 43, and a vegetable compartment temperature sensor 45 are provided on the rear side of the interior of the refrigerator compartment 2, the upper freezer compartment 4, and the vegetable compartment 6, respectively, a refrigerator compartment cooler temperature sensor 42 is provided on the top of the refrigerator compartment cooler 14a, and a freezer compartment cooler temperature sensor 44 is provided on the top of the freezer compartment cooler 14b.

In this embodiment, the freezer temperature sensor 43 is provided in the upper freezer 4, but it may also be provided in the lower freezer 5. These sensors detect the temperatures of the refrigerator compartment 2, ice-making compartment 3, upper freezer 4, lower freezer 5, vegetable compartment 6, cooler compartment 8, freezer cooler 14b, refrigerator air duct 131, and refrigerator cooler 14a.

In addition, an outside air temperature sensor 37 and an outside air humidity sensor 38 are provided inside the door hinge cover 16 on the ceiling of the refrigerator 1 to detect the temperature and humidity of the outside air (air outside the refrigerator). In addition, door sensors (not shown) are provided to detect the open/closed states of the doors 2a, 2b, 3a, 4a, 5a, and 6a.

A defrost heater 21 that heats the freezer cooler 14b is provided below the freezer cooler 14b in the cooler chamber 8. A freezer gutter 23 is formed on the underside of the cooler chamber 8, and a refrigerator gutter 25 is formed on the underside of the refrigerator air duct 131.

The freezer drain pipe 22 that is connected to the machine room 7 is provided downward from the lower end of the freezer gutter 23, and the refrigerator drain pipe 24 that is connected to the machine room 7 is provided downward from the lower end of the refrigerator gutter 25. In addition, the machine room 7 is equipped with a compressor 24 and an evaporation tray 32 arranged above the compressor 24.

The defrost heater 21 may be, for example, a 50W to 200W electric heater, and in this embodiment, a 120W radiant heater is used. The defrost water generated during defrosting of the freezer compartment cooler 14b and the refrigerator compartment cooler 14a is discharged into the evaporation dish 32 above the compressor 24 via the freezer compartment gutter 23, the freezer compartment drain pipe 22, the refrigerator compartment gutter 25, and the refrigerator compartment drain pipe 24, respectively, and evaporates due to the effects of heat radiation from the compressor 24 and ventilation by the machine compartment fan, etc.

A container 36, whose interior temperature is maintained at approximately -1°C, is provided above the insulating partition wall 27 in the refrigerator compartment 2, and the front of the container 36 can be opened and closed by a lid 36a. A packing (not shown) is provided on the outer periphery of the lid 36a, and when the lid 36a is closed, the packing ensures that the lid 36a and the container 36 are in contact with each other without any gaps, so that the internal space of the container 36 is sealed.

The back of the container 36 is equipped with a pump (not shown) that sucks air out of the container 36, and by operating the pump with the lid 36a closed, the air pressure inside the container 36 is reduced to approximately 0.8 atmospheres. As a result, the lid 36a prevents cold air from being blown directly into the container 36, and a reduced pressure environment is created, creating a storage space that prevents food from drying out and oxidizing.

Figure 5 is a diagram showing the configuration of the refrigeration cycle (refrigerant flow path) of refrigerator 1. The refrigeration cycle of refrigerator 1 will be explained with reference to Figure 5.

The refrigerator 1 includes a compressor 24, an external radiator (corresponding to a machine room condenser) 71 that exchanges heat between the refrigerant and the air outside the refrigerator and radiates heat from the refrigerant to the air, a wall surface heat radiation pipe 72, a condensation suppression pipe 73 that suppresses condensation on the front edge of the insulating partition walls 27, 28 and the partition part 29 (the external radiator 71, the wall surface heat radiation pipe 72, and the condensation suppression pipe 73 are called heat radiation means 70), a dryer 51 that removes moisture, a three-way valve 92 that is a refrigerant flow control means, a refrigeration capillary tube 75a and a freezing capillary tube 75b that are pressure reduction means for reducing the pressure of the refrigerant, a refrigerator compartment cooler 14a that exchanges heat between the refrigerant and the air inside the refrigerator and absorbs heat from the refrigerator, and a freezer compartment cooler 14b.

Furthermore, downstream of the refrigerator cooler 14a and downstream of the refrigeration cooler 14b, there are provided a refrigeration gas-liquid separator 28a and a refrigeration gas-liquid separator 28b, respectively, which prevent liquid refrigerant from flowing into the compressor 24. Furthermore, downstream of the refrigeration gas-liquid separator 28b, there is provided a check valve 89. These components are connected by refrigerant piping to form a refrigeration cycle.

In the refrigerator of this embodiment, the temperatures of the refrigeration cooler 14a and the freezer cooler 14b are adjusted by the rotation speeds of the compressor 24, the refrigeration fan 9a, and the freezing fan 9b, so the compressor 24, the refrigeration fan 9a, and the freezing fan 9b are called the evaporator temperature adjustment means. In addition, the refrigerant used is isobutane, which is a flammable refrigerant, and the amount of refrigerant charged is 88 g.

The refrigerant is compressed by the compressor 24 and discharged in gas phase, changes to two phases of gas and liquid in the external radiator 71 arranged in the machine room, and dissipates heat in the external radiator 71, the wall surface heat dissipation pipe 72, and the condensation suppression pipe 73, changing to liquid phase. The refrigerant is then depressurized in the refrigeration capillary tube 75a or the freezing capillary tube 75b, and absorbs heat from the air while changing to gas phase in the refrigerator cooler 14a or the freezing cooler 14b.

Figure 6 is a rear view of the vicinity of the machine chamber with the machine chamber cover 18 and control board case 31 removed from the refrigerator 1 in Figure 2, which is a characteristic part of this embodiment, Figure 7 is a top view of the machine chamber base 17, and Figure 8 is a perspective view of the external radiator 71.

The dashed arrows in FIG. 6 indicate the direction of air flow in the machine compartment, and the solid arrows in FIG. 8 indicate the direction of refrigerant flow. The configuration of the machine compartment of the refrigerator 1 according to the first embodiment will be described with reference to FIGS. 2, 6, 7, and 8.

As shown in FIG. 6, the machine room 7 is an area surrounded by the outer box 10a that forms the outer surface of the insulated box body 10, the machine room base 17, and the machine room cover 18 (see FIG. 2). This machine room 7 is formed so as to extend in the left and right width direction when viewed from the front of the refrigerator, i.e., the side where the door opens and closes. The machine room 7 has a roughly trapezoidal cross section (see FIG. 3) with a depth D1 (see FIG. 3) = 150 mm, a depth D2 (see FIG. 3) = 190 mm, and a height H = 190 mm, and is a spatial area with this cross-sectional shape extending over a width W = 880 mm.

The machine room 7 is a space that is long in the width direction (left-right direction) and short in height and depth. In other words, it is formed as a space with a large width dimension compared to the top-bottom dimensions and depth dimensions. Furthermore, the depth dimension D1 above the machine room 7 is shorter than the depth dimension D2 below the machine room 7. The outer box 10a has an outer box inlet opening 19 on the right side and an outer box outlet opening 35 on the left side.

In the machine room 7, from left to right, the compressor 24, the machine room fan 78, and the external radiator 71 are arranged in sequence at a predetermined interval. The heat transfer tube 77 of the external radiator 71, which will be described later, is connected to the discharge pipe 177 of the compressor 24 on the left of the external radiator 71, and to the connection pipe 178 to the wall surface heat radiation pipe 72 on the right. In addition, a control board case 31 (see Figure 2) is provided behind the external radiator 71, and the depth dimension of the space in which the external radiator 71 can be installed is set to be small compared to the width dimension W and the vertical dimension H.

An evaporator tray 32 is provided above the compressor 24, and defrosted water from the refrigerator compartment cooler 14a and the freezer compartment cooler 14b is stored in the evaporator tray 32 via the freezer compartment drain pipe 22 and the refrigerator compartment drain pipe 24. The evaporator tray 32 is designed to discharge water downward when the water level exceeds a certain level, and the discharged water is stored in the machine room base water storage section 17a provided in the machine room base 17. The water stored in the evaporator tray 32 and the machine room base water storage section 17a is evaporated by air blown by the machine room fan 78.

By driving the machine room fan 78 in the machine room 7, air flows into the machine room 7 through the outer box inlet opening 19 and the machine room base opening 17b. The air that flows into the machine room 7 passes through the external radiator 71, is pressurized by the machine room fan 78, and flows around the compressor 24. This airflow promotes heat dissipation from the external radiator 71 and the compressor 24. The air that has been heated by heat exchange with the external radiator 71 and the compressor 24 is discharged outside the machine room 7 through the outer box outlet opening 35 and the machine room cover opening 18a (see Figure 2).

The configuration of the machine room base 17 will be further explained using Figures 6 and 7. The machine room base 17 is provided on the underside of the machine room 7, and a floor surface flow path 190 through which air flows is formed between the floor surface of the installation floor and the machine room base 17. The flow path height L of the floor surface flow path is L = 17 mm, which is a narrow flow path that is less than one tenth of the height H of the machine room 7 (H = 190 mm).

As shown in FIG. 7, the machine room base 17 has a machine room base opening 17b, which is a slit-shaped opening, on the underside, and functions as a hole for drawing air into the machine room. The air flowing into the machine room 7 from the machine room base opening 17b passes through a relatively narrow flow path between the floor surface and the machine room base 17.

The opening area of the machine room base opening 17b through which air flows is 1230 ^mm2 , which is smaller than the opening area of the outer box inlet opening 19 through which air flows (13000 ^mm2 in this embodiment) in order to make it difficult for dust accumulated near the floor surface to flow into the machine room 7. The smaller the opening area, the greater the ventilation resistance, so the machine room base opening 17b has greater ventilation resistance than the outer box inlet opening 19.

The configuration of the external radiator 71 will be described with reference to Figures 6 and 8. As shown in Figure 6, the external radiator 71 radiates heat using air drawn into the machine room 7 from the outer box inlet opening 19 and the machine room base opening 17b. As shown in Figure 8, the external radiator 71 installed in the machine room 7 is a cross-fin tube type heat exchanger that includes a heat transfer tube 77 through which a refrigerant flows and multiple fins fixed to the heat transfer tube 77 to promote heat exchange with the air.

In this way, by using a cross-fin tube type heat exchanger as the external radiator 71, the efficiency of heat radiation can be improved. The heat transfer tube 77 mainly comprises a heat exchange section where fins are installed and a bend section where the heat transfer tube 77 is bent. In the following, the multiple fins provided in the heat exchange section may be referred to as a fin group. In this embodiment, all the fins are independent, and each fin is fixed to one heat transfer tube 77. In addition, the bend section connects each heat transfer tube 77 across adjacent fin groups.

The external radiator 71 has a width W71 of 192 mm, a height H71 of 172 mm, and a depth A71 of 83 mm. The heat exchange section of the vertical heat radiating section 71a has a width W1 of 53 mm, a height H1 of 114 mm, and a depth A1 of 83 mm, while the heat exchange section of the horizontal heat radiating section 71b has a width W2 of 111 mm, a height H2 of 26 mm, and a depth A2 of 83 mm.

As shown in FIG. 6, the external radiator 71 is configured in a generally L-shape and includes a vertical radiator 71a, which is a heat exchanger facing the outer box inlet opening 19, and a horizontal radiator 71b, which is a heat exchanger facing the machine room base opening 17b. Note that the external radiator 71 is configured from the vertical radiator 71a and the horizontal radiator 71b, but is not limited to the vertical radiator 71a and the horizontal radiator 71b, and may include two radiators.

In this embodiment, the machine room 7 extends in the left-right width direction when viewed from the opening and closing door of the refrigerator, and is connected to the outer box inlet opening 19 and the outer box outlet opening 35 formed on the side of the refrigerator. The vertical heat dissipation section 71a is provided along the side of the refrigerator so as to face the outer box inlet opening 19. In other words, it is provided along the side of the refrigerator in a direction perpendicular to the installation floor. On the other hand, the horizontal heat dissipation section 71b is provided along the bottom surface of the refrigerator so as to face the machine room base opening 17b. In other words, it is provided along the installation floor in a direction parallel to the installation floor.

In this embodiment, as shown in Figure 8, the vertical heat dissipation section 71a and the horizontal heat dissipation section 71b are connected to each other via the bends of the heat transfer tubes 77 and are formed as one unit. The vertical heat dissipation section 71a has two rows in the air flow direction and four stages of heat transfer tubes 77a to 77h in the direction perpendicular to the air flow, while the horizontal heat dissipation section 71b has one row in the air flow direction and four stages of heat transfer tubes 77i to 77l in the direction perpendicular to the air flow.

In this embodiment, the row on the upstream side of the vertical heat dissipation section 71a in the air flow direction is sometimes called the first row of vertical heat dissipation sections 201, the row on the downstream side is sometimes called the second row of vertical heat dissipation sections 202, and the row of horizontal heat dissipation sections 71b is sometimes called the first row of horizontal heat dissipation sections 211. A shielding member (not shown) is installed in the bend section to suppress the air flow, so that the air flow is concentrated in the heat exchange section.

The refrigerant flows through the heat transfer tubes 77a, 77b, 77c, 77d, 77e, 77i, 77j, 77f, 77g, 77k, 77l, and 77g in this order. The discharge pipe 177 of the compressor 24 shown in FIG. 6 is connected to the heat transfer tube 77a, and the heat transfer tube 77l is connected to the connection pipe 178 to the wall surface heat radiation pipe 72.

The high-temperature refrigerant discharged from the compressor flows through discharge pipe 178, and as it flows through heat transfer tubes 77a, 77b, and 77c, it dissipates heat and its temperature drops, and reaches a two-phase gas-liquid state in heat transfer tube 77d. From heat transfer tube 77f onwards, heat is dissipated in a two-phase gas-liquid state, so an approximately constant temperature is maintained.

The fin spacing G1 of the fin group of the vertical heat dissipation section 71a and the fin spacing G2 of the fin group of the horizontal heat dissipation section 71b are both 3 mm. The total surface area of the fin group of the vertical heat dissipation section 71a is 281,500 ^mm2 , and the total surface area of the fin group of the horizontal heat dissipation section 71b is 140,750 ^mm2 . In the external radiator 71 configured in this manner, the ventilation resistance of the vertical heat dissipation section 71a is greater than the ventilation resistance of the horizontal heat dissipation section 71b.

The horizontal heat dissipation section heat transfer tubes 77i to 77l form the horizontal heat dissipation section 71b and extend in the left-right direction. This allows for good storage because the bends of the horizontal heat dissipation section heat transfer tubes 77i to 77l protrude in the width (left-right) direction in which the largest dimension of the width, depth, and height of the machine room 7 is secured. In addition, the vertical heat dissipation section heat transfer tubes 77a to 77h extend in the up-down direction while forming the vertical heat dissipation section 71a, so they can be easily connected to each other via the bends on the right side of the horizontal heat dissipation section 71b and the lower part of the vertical heat dissipation section 71a, providing good connectivity and facilitating integrated manufacturing.

The vertical heat dissipation section 71a of the external radiator 71 dissipates heat mainly by air drawn in from the outer box inlet opening 19, and the horizontal heat dissipation section 71b dissipates heat by air drawn in from the machine room base opening 17b.

The configuration of the refrigerator 1 of this embodiment has been explained above. Next, we will explain the operation and effects of the refrigerator 1 of this embodiment.

The refrigerator 1 of this embodiment is characterized by having an outer box inlet opening 19 (low ventilation resistance opening) that opens to the left, a machine room base opening 17b (high ventilation resistance opening) that opens downward, a vertical heat dissipation section 71a (high ventilation resistance radiator) of an external radiator 71 that faces the outer box inlet opening 19 (low ventilation resistance opening) and dissipates heat mainly with air taken in from the outer box inlet opening 19, a horizontal heat dissipation section 71b (low ventilation resistance radiator) of the external radiator 71 that faces the machine room base opening 17b (high ventilation resistance opening) and dissipates heat mainly with air taken in from the machine room base opening 17b, and a machine room 7 in which "the ventilation resistance of the vertical heat dissipation section 71a of the external radiator 71 > the ventilation resistance of the horizontal heat dissipation section 71b of the external radiator 71" is satisfied. (Configuration described in claim 1)
Since the machine room base opening 17b has a relatively high ventilation resistance, the flow rate of air passing therethrough is smaller than the flow rate of air passing through the outer box inlet opening 19. On the other hand, the ventilation resistance of the horizontal heat radiating section 71b facing the machine room base opening 17b is smaller than the ventilation resistance of the vertical heat radiating section 71a facing the outer box inlet opening 19. This makes it possible to suppress bias in the air flow rate passing through the vertical heat radiating section 71a and the horizontal heat radiating section 71b, and improve the heat dissipation efficiency of the external radiator 71.

In other words, compared to conventional refrigerators, the horizontal heat dissipation section 71b has a smaller ventilation resistance, so more air can flow in from the machine room base opening 17b, and the vertical heat dissipation section 71a has a larger ventilation resistance, so more air can flow in from the outer box inlet opening 19. These actions make it possible to suppress bias in the amount of air flowing through the vertical heat dissipation section 71a and the horizontal heat dissipation section 71b.

In this embodiment, the high ventilation resistance opening is the machine room base opening 17b adjacent to the floor surface, but the high ventilation resistance opening is not necessarily limited to a position adjacent to the floor surface. For example, a high ventilation resistance opening may be provided in the machine room cover 18 arranged on the rear side of the machine room 7. In this case, a similar effect can be obtained by arranging a low ventilation resistance radiator opposite the high ventilation resistance opening provided in the machine room cover 18.

In addition, in the refrigerator 1 of this embodiment, the vertical heat radiation section 71a (high ventilation resistance heat radiation section) of the radiator 71 includes vertical heat radiation section heat transfer tubes 77a to 77h (first heat transfer tubes) through which the refrigerant flows, and a fin group (first fin group) consisting of a plurality of fins fixed to the vertical heat radiation section heat transfer tubes 77a to 77h, and the horizontal heat radiation section 71b of the external radiator 71 includes horizontal heat radiation section heat transfer tubes 77i to 77l (second heat transfer tubes) through which the refrigerant flows, and a fin group (second fin group) consisting of a plurality of fins fixed to the horizontal heat radiation section heat transfer tube 77b, and the total fin surface area of the first fin group is larger than the total fin surface area of the second fin group. (Configuration described in claim 2)
By adopting such an embodiment, the frictional resistance on the fin surface can make the ventilation resistance of the vertical heat dissipation section 71a greater than that of the horizontal heat dissipation section 71b, thereby suppressing bias in the air flow rate.

The means for making the total fin surface area of the vertical heat dissipation section 71a larger than the total fin surface area of the horizontal heat dissipation section 71b is not limited to the embodiment. For example, the heat transfer tubes 77 of the vertical heat dissipation section 71a and the horizontal heat dissipation section 71b may both be arranged in a single row, with the fin spacing G1 of the fin group constituting the vertical heat dissipation section 71a being 1.5 mm and the fin spacing G2 of the fin group constituting the horizontal heat dissipation section 71b being 3.0 mm, so that the fin spacing of the vertical heat dissipation section 71a is smaller than the fin spacing of the horizontal heat dissipation section 71b. In this case, it is possible to make the heat sink 71 more compact.

In addition, in the refrigerator 1 of this embodiment, the number of rows of the vertical heat radiating section 71a (high ventilation resistance radiator) of the external radiator 71 is set to be greater than the number of rows of the horizontal heat radiating section 71b (low ventilation resistance radiator). Specifically, the vertical heat radiating section 71a is configured with two rows of heat transfer tubes (heat transfer tubes 77a to 77d and heat transfer tubes 77e to 77h) in the air flow direction, and the horizontal heat radiating section 71b is configured with one row of heat transfer tubes (heat transfer tubes 77i to 77l) in the air flow direction. (Configuration described in claim 3)
By adopting such an embodiment, the shape resistance of the heat transfer tube can make the ventilation resistance of the vertical heat dissipation section 71a greater than the ventilation resistance of the horizontal heat dissipation section 71b, so that the ventilation resistance of the vertical heat dissipation section 71a and the horizontal heat dissipation section 71b can be adjusted and bias in the flow rate of air passing through can be suppressed.

In addition, in the refrigerator 1 of this embodiment, the vertical heat radiating section heat transfer tubes 77a to 77h (first heat transfer tubes) have vertical heat radiating section heat transfer tube bends (first bends) which are bent portions of the tubes, the vertical heat radiating section heat transfer tubes 77a to 77h are arranged substantially vertically, the vertical heat radiating section heat transfer tube bends are formed above and below the vertical heat radiating section 71a, and the vertical heat radiating section heat transfer tubes 77a to 77h and the horizontal heat radiating section heat transfer tubes 77i to 77l are integrally formed. (Configuration described in claim 4)
By adopting this configuration, in the machine room 7 where the upper depth dimension is shorter than the height dimension, the bend portion of the heat transfer pipe of the vertical heat dissipation section protrudes in the height direction, which is the larger dimension, so that the heat exchange section of the vertical heat dissipation section 71a can be enlarged and the heat dissipation performance can be improved.

In addition, in the refrigerator 1 of this embodiment, the horizontal heat radiating section heat transfer pipes 77i to 77l (second heat transfer pipes) have horizontal heat radiating section heat transfer pipe bends (second bends) which are bent portions of the pipes, and the horizontal heat radiating section heat transfer pipes 77i to 77l are arranged substantially horizontally, and the horizontal heat radiating section heat transfer pipe bends are formed on the left and right sides of the horizontal heat radiating section 71b. (Configuration described in claim 5)
By adopting this configuration, the bend portion of the horizontal heat dissipation section heat transfer pipe protrudes in the width direction, which is the largest dimension among the width, height, and depth of the machine chamber 7, thereby improving the storability of the external radiator 71.

In addition, the refrigerator 1 of this embodiment is provided with a compressor 24 inside the machine room 7, and the compressor discharge pipe 177 connected to the discharge port of the compressor 24 is connected to the heat transfer pipe 77a of the row on the upstream side (here, the most upstream side) in the air flow direction of the heat transfer pipes 77a to 77h (first heat transfer pipes) of the vertical heat radiating section 71a, and the gas phase refrigerant discharged from the compressor 24 becomes a two-phase refrigerant inside the vertical heat radiating section heat transfer pipes 77a to 77h and is connected to the heat transfer pipes 77i to 77l (second heat transfer pipes) of the horizontal heat radiating section 71b. Furthermore, the refrigerator 1 is characterized in that the outlet of the first heat transfer pipe 77h of the row located on the most downstream side in the air flow direction flowing through the vertical heat radiating section 71a is connected to the wall surface heat radiating pipe of the refrigerator. (Configurations described in claims 6 and 7)
The refrigerant discharged from the compressor 24 is a gas (gas phase), and the gas phase refrigerant flows into the external radiator 71. Thereafter, the refrigerant radiates heat as it flows through the vertical heat radiating section heat transfer tubes 77a, 77b, and 77c, lowering its temperature, and reaches a gas-liquid two-phase state in the vertical heat radiating section heat transfer tube 77d. The heat transfer coefficient of the gas-liquid two-phase refrigerant is affected by gravity, and in the horizontal tubes, the condensed liquid flows down to the bottom of the tube, so the thermal resistance due to the liquid film inside the tube is small. On the other hand, in the vertical tubes, the entire inner circumference of the tube is covered with a liquid film, so the thermal resistance is larger than in the horizontal tubes.

Therefore, in a radiator consisting of horizontal and vertical tubes, it is effective to radiate heat so that the refrigerant becomes two-phase gas-liquid in the horizontal tube section. Therefore, in the refrigerator of this embodiment, the gas-phase refrigerant discharged from the compressor 24 is changed to two-phase gas-liquid in the heat transfer tube 77c of the vertical heat radiating section 71a, and the two-phase gas-liquid refrigerant is made to flow through the heat transfer tubes 77i to 77l of the horizontal heat radiating section 71b, which have a high heat transfer coefficient, thereby increasing the heat radiation efficiency of the external radiator 71.

Next, a second embodiment will be described. Note that a description of the same configuration as the first embodiment will be omitted. FIG. 9 shows an external radiator 71 of a refrigerator 1 according to the second embodiment. The external radiator 71 of this embodiment differs from the external radiator 71 of Example 1 in the order in which the refrigerant flows through the heat transfer tubes 77.

The compressor discharge pipe 177 (see FIG. 6), through which the refrigerant discharged from the compressor 24 flows, is connected to the upper part of the heat transfer pipe 77h on the left side where the compressor is installed, among the heat transfer pipes of the vertical heat dissipation section 71a of the external radiator 71. The refrigerant flows in from 71h and flows downward, entering the heat transfer pipe 77l of the horizontal heat dissipation section 71b.

Then, the heat transfer tube 77k of the horizontal heat dissipation section 71b, the heat transfer tubes 77g and 77f of the vertical heat dissipation section 71a, the heat transfer tubes 77j and 77i of the horizontal heat dissipation section 71b, and the heat transfer tubes 77e, 77d, 77c, 77b, and 77a of the vertical heat dissipation section 71a in this order. The heat transfer tube 77a is connected to the connection tube 178 (see FIG. 6) to the wall surface heat dissipation tube 72.

The configuration of the refrigerator 1 of this embodiment has been explained above. Next, we will explain the operation and effects of the refrigerator 1 of this embodiment.

The refrigerator 1 of this embodiment is characterized in that, inside the machine room 7, the compressor 24 is provided on the left side of the external radiator 71, and the wall surface heat radiation pipe 72 is provided on the right side of the external radiator 71, and a connection pipe 177 (compressor discharge pipe) connected to the discharge port of the compressor 24 is connected to the heat transfer pipe (heat transfer pipe 77h) of the row located most downstream in the air flow direction among the heat transfer pipes of the vertical heat radiation section 71a, and a connection pipe 178 connected to the wall surface heat radiation pipe 72 is connected to the heat transfer pipe 77a of the vertical heat radiation section 71a located most upstream in the air flow direction. (Configuration described in claim 8)
By adopting such a configuration, it is possible to obtain the same functions and effects as the first embodiment, and also to facilitate the connection of the pipes, improving manufacturability.

The above embodiments have been described in detail to clearly explain the present invention, and are not necessarily limited to those having all of the configurations described. In addition, it is also possible to replace part of the configuration of each embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment as appropriate. It is also possible to add, delete, or replace other configurations with respect to part of the configuration of this embodiment. In addition, the mechanisms and configurations shown are those that are considered necessary for explanation, and do not necessarily represent all mechanisms and configurations in the product.

1...refrigerator, 2...refrigerating compartment, 3...ice-making compartment, 4...upper freezer compartment, 5...lower freezer compartment, 6...vegetable compartment, 7...machine compartment, 8...cooler compartment, 9a...refrigerating compartment fan, 9b...freezer compartment fan, 10...insulating box body, 10a...outer box, 10b...inner box, 14a...refrigerating compartment cooler, 14b...freezer compartment cooler, 16...door hinge cover, 17...machine compartment base, 18...machine compartment cover, 19...outer box entrance opening, 21...defrosting heater, 24...compressor, 25...vacuum insulation material, 27, 28...insulating partition wall, 29, 30...partition, 31...control board case, 32...evaporation tray, 35...outer box exit opening, 41...refrigerating compartment temperature sensor, 42 ...Refrigerator cooler temperature sensor, 43...Freezer temperature sensor, 44...Freezer cooler temperature sensor, 45...Vegetable compartment temperature sensor, 60...Freezer, 71...External radiator, 71a...Vertical heat dissipation section, 71b...Horizontal heat dissipation section, 72...Wall surface heat dissipation piping, 73...Condensation suppression piping, 77...Condensation suppression piping, 100...Freezer compartment air duct, 105...Freezer compartment return air duct, 115...Refrigerator compartment return air duct, 120...Refrigerator compartment second air duct, 130...Refrigerator compartment return air duct, 131...Refrigerator compartment air duct, 132...Vegetable compartment air duct, 135...Vegetable compartment return air duct, 160...Vegetable compartment damper, 177...Compressor discharge piping, 178...Connection piping for wall surface heat dissipation piping.

Claims (16)

A refrigerator including at least a storage compartment for storing food and beverages, an opening and closing door provided in the storage compartment, and a machine compartment in which a radiator for exchanging heat between a refrigerant compressed by a compressor and air is disposed,
The machine room is formed so as to extend in the left-right direction as seen from the opening and closing door side;
A low-ventilation resistance opening portion formed on one side surface in a left-right direction of the refrigerator connected to the machine room;
A high-ventilation resistance opening portion having a higher ventilation resistance than the low-ventilation resistance opening portion, the high-ventilation resistance opening portion being formed on a bottom surface of the refrigerator in a downward direction connected to the machine room or on a rear surface of the refrigerator in a rear direction;
a high ventilation resistance radiator facing the low ventilation resistance opening and radiating heat mainly with air taken in through the low ventilation resistance opening;
The refrigerator is characterized by comprising a low ventilation resistance radiator facing the high ventilation resistance opening, radiating heat mainly with air taken in from the high ventilation resistance opening, and having smaller ventilation resistance than the high ventilation resistance radiator. In the refrigerator according to claim 1,
the high ventilation resistance radiator includes a first fin group including a first heat transfer tube through which a refrigerant flows and a plurality of fins fixed to the first heat transfer tube;
the low ventilation resistance radiator includes a second fin group including a second heat transfer tube connected to the first heat transfer tube and through which a refrigerant flows, and a plurality of fins fixed to the second heat transfer tube;
A refrigerator, characterized in that a total fin surface area of the first fin group is set to be larger than a total fin surface area of the second fin group. In the refrigerator according to claim 1,
the high ventilation resistance radiator includes a first fin group including a first heat transfer tube through which a refrigerant flows and a plurality of fins fixed to the first heat transfer tube;
the low ventilation resistance radiator includes a second fin group including a second heat transfer tube connected to the first heat transfer tube and through which a refrigerant flows, and a plurality of fins fixed to the second heat transfer tube;
a number of rows of the first fin group in a flow direction of air flowing through the high ventilation resistance radiator is set to be greater than a number of rows of the second fin group in a flow direction of air flowing through the low ventilation resistance radiator. In the refrigerator according to claim 2 or 3,
A plurality of the first fin groups are provided in a direction perpendicular to the flow direction of air flowing through the high ventilation resistance radiator,
the first heat transfer tubes of each of the plurality of first fin groups are arranged to extend in a direction along the side surface of the refrigerator,
a first bend portion having a bent portion spanning adjacent first fin groups is disposed at an end of each of the first fin groups, and each of the first heat transfer tubes is connected by the first bend portion. In the refrigerator according to claim 4,
A plurality of the second fin groups are provided in a direction perpendicular to a flow direction of air flowing through the low ventilation resistance radiator,
the second heat transfer tubes of each of the second fin groups are arranged to extend in a direction along a bottom surface of the refrigerator,
a second bend portion having a bent portion spanning adjacent second fin groups is disposed at an end of each of the second fin groups, and each of the second heat transfer tubes is connected by the second bend portion. The refrigerator according to claim 3,
A compressor is provided inside the machine room,
a compressor discharge pipe connected to a discharge port of the compressor is connected to an inlet of the first heat transfer tube of the first fin group in a row located most upstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator;
the wall surface heat dissipation piping of the refrigerator is connected to an outlet of the first heat transfer tube of the first fin group in the row located most downstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator. The refrigerator according to claim 6,
The refrigerator, wherein the refrigerant discharged from the compressor becomes a gas-liquid two-phase refrigerant inside the first heat transfer tube and flows to the second heat transfer tube. The refrigerator according to claim 3,
A compressor is provided inside the machine room,
a compressor discharge pipe connected to a discharge port of the compressor is connected to an inlet of the first heat transfer tube of the first fin group in a row located on the most downstream side as viewed in a flow direction of air flowing through the high ventilation resistance radiator;
the wall surface heat dissipation piping of the refrigerator is connected to an outlet of the first heat transfer tube of the first fin group in the row located most upstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator. A refrigerator including at least a storage compartment for storing food and beverages, an opening and closing door provided in the storage compartment, and a machine compartment in which a compressor and a radiator are disposed,
The machine room is formed so as to extend in the left-right direction as viewed from the opening and closing door side,
A low-ventilation resistance opening connected to the machine room is formed on one side surface in the left-right direction of the refrigerator,
A high-ventilation resistance opening having a higher ventilation resistance than the low-ventilation resistance opening connected to the machine room is formed on a bottom surface of the refrigerator in a downward direction,
a high ventilation resistance radiator is provided along the side surface, facing the low ventilation resistance opening, and radiates heat mainly with air taken in through the low ventilation resistance opening;
The refrigerator is characterized in that a low ventilation resistance radiator having smaller ventilation resistance than the high ventilation resistance radiator is provided along the bottom surface, facing the high ventilation resistance opening, and radiating heat mainly with air taken in from the high ventilation resistance opening. The refrigerator according to claim 9,
The refrigerator is characterized in that an opening area through which air flows of the low ventilation resistance opening is set to be larger than an opening area through which air flows of the high ventilation resistance opening. The refrigerator according to claim 10,
The low ventilation resistance radiator and the high ventilation resistance radiator are cross fin tube type heat exchangers,
The refrigerator is characterized in that a total surface area of the fins of the high ventilation resistance radiator is set to be larger than a total surface area of the fins of the low ventilation resistance radiator. The refrigerator according to claim 10,
the high ventilation resistance radiator includes a first fin group including a first heat transfer tube through which a refrigerant flows and a plurality of fins fixed to the first heat transfer tube;
the low ventilation resistance radiator includes a second fin group including a second heat transfer tube connected to the first heat transfer tube and through which a refrigerant flows, and a plurality of fins fixed to the second heat transfer tube;
a number of rows of the first fin group in a flow direction of air flowing through the high ventilation resistance radiator is set to be greater than a number of rows of the second fin group in a flow direction of air flowing through the low ventilation resistance radiator. The refrigerator according to claim 12,
A plurality of the first fin groups are provided in a direction perpendicular to the flow direction of air flowing through the high ventilation resistance radiator,
the first heat transfer tubes of each of the plurality of first fin groups are arranged to extend in a direction along the side surface of the refrigerator,
a first bend portion having a bent portion spanning adjacent first fin groups is disposed at an end of each of the first fin groups, and each of the first heat transfer tubes is connected by the first bend portion. The refrigerator according to claim 13,
A plurality of the second fin groups are provided in a direction perpendicular to a flow direction of air flowing through the low ventilation resistance radiator,
the second heat transfer tubes of each of the second fin groups are arranged to extend in a direction along a bottom surface of the refrigerator,
a second bend portion having a bent portion spanning adjacent second fin groups is disposed at an end of each of the second fin groups, and each of the second heat transfer tubes is connected by the second bend portion. The refrigerator according to claim 14,
a compressor discharge pipe connected to a discharge port of the compressor is connected to an inlet of the first heat transfer tube of the first fin group in a row located most upstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator;
the wall surface heat dissipation piping of the refrigerator is connected to an outlet of the first heat transfer tube of the first fin group in the row located most downstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator. The refrigerator according to claim 14,
a compressor discharge pipe connected to a discharge port of the compressor is connected to an inlet of the first heat transfer tube of the first fin group in a row located on the most downstream side as viewed in a flow direction of air flowing through the high ventilation resistance radiator;
the wall surface heat dissipation piping of the refrigerator is connected to an outlet of the first heat transfer tube of the first fin group in the row located most upstream as viewed in a flow direction of air flowing through the high ventilation resistance radiator.

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