JP2020106214A - refrigerator - Google Patents

Abstract

To solve the problem that an air quantity of cold air to be sucked into a cooling chamber cannot be sufficiently secured in a conventional refrigerator and there is the risk that cooling efficiency is reduced.SOLUTION: In a refrigerator 10, a refrigerating chamber return air duct 43 is around a suction port 45 communicating with a cooling chamber 21, and an expansion part 63 is formed on a back wall 13A of an inner box 13 constituting the cooling chamber 21. The suction port 45 is formed while being enlarged to a region in which the expansion part 63 is formed. Further, a notched region 53A is formed around a region opposed to the suction port 45 on a sidewall 53 of a cooler 22. In such a structure, a flow of cold air around the suction port 45 of the cooling chamber 21 becomes smooth, the quantity of air to be sucked into the cooling chamber 21 is secured, cold air is prevented from being stagnated around the suction port 45, and cooling efficiency of the refrigerator 10 is prevented from being reduced.SELECTED DRAWING: Figure 5

Description

The present invention relates to a refrigerator that cools and stores foods and the like in a storage chamber, and in particular, improves the flow of cool air around and around the suction port of the cooling chamber that communicates with the return air passage, and reduces the amount of cool air that returns to the cooling chamber. Regarding the refrigerator to secure.

As a conventional refrigerator 100, a structure shown in FIG. 6 is known. FIG. 6 is a front view for explaining the flow of cold air returning to the cooling chamber 101 of the conventional refrigerator 100.

As shown in FIG. 6, in the cooling chamber 101 of the refrigerator 100, a defrost heater 102, a cooler 103, and an internal fan 104 are mainly arranged from the lower side thereof. A refrigerating compartment return duct 105 is arranged on the right side of the cooling compartment 101, and a suction port 107 is formed on a side wall 106 near the lower right end of the cooling compartment 101. The refrigerating compartment return duct 105 communicates with the cooling compartment 101 via the suction port 107.

The arrow 108 indicates the cool air returning from the refrigerating compartment (not shown) to the cooling compartment 101. The cool air has a flow direction of about 90 degrees at the bent portion 109 at the lower end of the refrigerating compartment return duct 105. After changing, it flows into the cooling chamber 101. Then, the cold air flowing into the cooling chamber 101 flows to the upper side of the cooling chamber 101 due to the suction force of the internal fan 104. At this time, the cold air exchanges heat with the cooler 103, so that It is cooled to a desired temperature (see, for example, Patent Document 1).

JP, 2005-7510, A

As shown in FIG. 6, in the refrigerator 100, the refrigerating compartment return duct 105 communicates with the cooling compartment 101 via the suction port 107 formed in the side wall 106 of the cooling compartment 101. Then, the cool air returning from the refrigerating compartment changes its flow direction by approximately 90 degrees at the bent portion 109 at the lower end of the refrigerating compartment return duct 105, and then flows into the cooling compartment 101.

With this structure, the cold air flowing through the inside of the refrigerating compartment return duct 105 is pressed downward by the bent portion 109 near the suction port 107. Then, the cold air flows into the cooling chamber 101 through the suction port 107 in that state. As a result, when the opening area of the suction port 107 is small, it becomes difficult to secure the flow passage area of the cool air at the suction port 107, and the air volume of the cool air sucked into the cooling chamber 101 is not sufficiently secured, so that the cooling air is not cooled. Efficiency may deteriorate.

Further, in the cooling chamber 101, the defrost heater 102 and the cooler 103 are arranged in the vicinity of the suction port 107, so that the defrost heater 102 and the cooler 103 prevent the flow of the cool air flowing into the cooling chamber 101. Inhibit. Then, the cold air that has flowed into the cooling chamber 101 is weakened in momentum due to the above-mentioned obstruction, and it becomes difficult for the cold air to flow to the inner side of the cooling chamber 101, so that the cold air does not reach the entire cooler 103. As a result, when frost forms on the suction port 107 side of the cooler 103, it becomes difficult to secure the flow path of the cool air in the cooling chamber 101, and the cooling efficiency may deteriorate.

The present invention has been made in view of the above circumstances, and a refrigerator that improves the flow of cool air around a suction port of a cooling chamber that communicates with a return air passage and the periphery thereof and secures the amount of cool air that returns to the cooling chamber. To provide.

The refrigerator of the present invention is provided with a storage chamber formed inside an insulating box and a cooler for cooling the cold air supplied to the storage chamber, and is attached to the lower end of the cooler to cool the refrigerator. A defrosting heater that removes frost that has frosted on the container, and a return air passage that returns the cold air supplied to the storage chamber to the cooling chamber. One end side of the defrosting heater is detachably attached to the rear side in the depth direction of the cooling chamber, and the other end side of the defrost heater is detachably attached to the front side in the depth direction of the cooling chamber. A suction port communicating with the return air passage is formed on a side wall of the cooling chamber facing the end surface on the one end side of the defrosting heater, and at least a side wall of the cooler facing the suction port is at least A notched region is formed by cutting out a part of the cooling chamber on the rear side in the depth direction.

Further, in the refrigerator of the present invention, on the rear wall of the cooling chamber, at least a part thereof is directed toward the rear side in the depth direction of the cooling chamber along the arrangement area of the defrost heater. It is characterized in that a swollen portion is formed.

Further, in the refrigerator of the present invention, the suction port is open to the side wall of the cooling chamber arranged in the region where the bulging portion is formed.

Further, in the refrigerator of the present invention, further comprises a blower air passage for blowing the cool air from the cooling chamber to the storage chamber, and a damper arranged in the blower air passage, and the opening area of the suction port is It is characterized in that it is configured to be the same as or wider than the flow passage area of the region in which the damper is provided in the feed air passage.

The refrigerator of the present invention includes a storage chamber formed inside the heat insulating box, a cooler for cooling the cool air supplied to the storage chamber, and a cooling chamber provided at the lower end of the cooler and provided with a defrost heater. , A return air passage for returning the cool air supplied to the storage chamber to the cooling chamber. Then, one end side of the defrost heater is detachably attached to the rear side in the depth direction of the cooling chamber, and the other end side of the defrost heater is detachably attached to the front side in the depth direction of the cooling chamber. Mounted on. Further, a suction port communicating with the return air passage is formed on the side wall of the cooling chamber facing the end face on one end side of the defrost heater, and at least the depth of the cooling chamber is formed on the side wall of the cooler facing the suction port. A cutout region is formed by cutting out a part on the rear side in the direction. With this structure, the flow of the cool air returning from the return air passage to the cooling chamber becomes smooth at the suction port of the cooling chamber and its surroundings, and the amount of the cool air returning to the cooling chamber can be secured. Also, in order to make the flow of cool air around the inlet of the cooling chamber smooth, the attachment/detachment direction of the defrost heater on the inlet side is set to the rear side of the cooling chamber, but the attachment/detachment of the defrost heater on the opposite side of the inlet is By setting the direction to the front side of the cooling chamber and staggering the attachment/detachment directions, a structure considering the workability of attaching/detaching the defrost heater to/from the lower end of the cooler is realized.

Further, in the refrigerator of the present invention, on the back wall of the cooling chamber, a bulging portion along the arrangement area of the defrost heater, at least a part of which bulges toward the rear side of the cooling chamber from the suction port side. Are formed. With this structure, the flow of the cool air returning from the return air passage to the cooling chamber becomes smooth, and the cool air easily spreads throughout the cooler, so that the cooling efficiency of the refrigerator is improved.

Further, in the refrigerator of the present invention, the suction port is open to the side wall of the cooling chamber arranged in the region where the bulging portion is formed. With this structure, it is possible to prevent cold air from staying in the bent region at the lower end of the return air passage, and to stabilize the amount of cool air returning to the cooling chamber.

Further, the refrigerator of the present invention further comprises a blowing air passage for blowing cool air from the cooling chamber to the storage chamber, and a damper arranged in the feeding air passage, and the opening area of the suction port is equal to that of the feeding air passage. It is configured to be the same as or wider than the flow path area of the damper installation region. With this structure, the amount of cold air sucked into the cooling chamber is secured, and the cooling efficiency of the refrigerator is improved.

It is a figure which shows the refrigerator which concerns on embodiment of this invention, (A) is the perspective view which looked at the refrigerator from the front, (B) is a side sectional drawing of a refrigerator. It is a front view explaining the air duct of the cold air which circulates in the refrigerator concerning the embodiment of the present invention. It is a perspective view explaining the cooler and the defrost heater of the refrigerator concerning the embodiment of the present invention. It is a perspective view explaining the refrigerating room return air course and the cooling room of the refrigerator concerning the embodiment of the present invention. It is an (A) sectional view and a (B) sectional view explaining structure in a cooling room of a refrigerator concerning an embodiment of the present invention. It is a front view explaining the flow of the cold air which returns to the cooling chamber of the conventional refrigerator.

Hereinafter, a refrigerator 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the present embodiment, the same reference numerals are used for the same members in principle, and repeated description will be omitted. In the following description, the up-down direction indicates the height direction of the refrigerator 10, the left-right direction indicates the width direction of the refrigerator 10, and the front-back direction indicates the depth direction of the refrigerator 10. The left-right direction indicates the left-right direction when the refrigerator 10 is viewed from the front.

FIG. 1A is a perspective view illustrating a schematic structure of the refrigerator 10 according to the embodiment of the present invention, and is a view seen from the front of the refrigerator 10. FIG. 1(B) is a side sectional view for explaining the schematic structure of the refrigerator 10 according to the embodiment of the present invention. FIG. 2 is a front view illustrating an air passage for cold air circulating in the refrigerator 10 according to the embodiment of the present invention. The direction in which cold air circulates is indicated by an arrow.

As shown in FIG. 1A, the refrigerator 10 includes a heat insulating box 11 as a main body, and a storage chamber for storing food and the like is formed inside the heat insulating box 11. As a storage room, a refrigerating room 15 (see FIG. 1B) and a freezing room 16 (see FIG. 1B) are formed from the top.

The heat insulating doors 17 and 18 are doors that openably and closably close the opening on the front surface of the refrigerating chamber 15 of the heat insulating box 11. The heat insulating door 17 is rotatably supported by the heat insulating box 11 at the upper and lower ends on the right end when viewed from the front, and the heat insulating door 18 is rotatably moved on the upper and lower ends at the left end when viewed from the front. It is supported by the body 11.

The heat insulation doors 19 and 20 are doors that openably and closably close the opening on the front surface of the freezer compartment 16 of the heat insulation box 11. The heat insulating door 19 is rotatably supported by the heat insulating box 11 at the upper and lower ends of the right end when viewed from the front, and the heat insulating door 20 is rotatably moved at the upper and lower ends of the left end when viewed from the front. It is supported by the body 11.

As shown in FIG. 1(B), a heat insulating box body 11 which is the main body of the refrigerator 10 is provided with an outer box 12 made of a steel plate having an opening on the front side, and a space is provided inside the outer box 12, and And an inner box 13 made of synthetic resin having an opening. A heat insulating material 14 made of foamed polyurethane is filled and foamed in the gap between the outer box 12 and the inner box 13. The heat insulating doors 17, 18, 19, 20 also have a heat insulating structure, like the heat insulating box 11.

In addition, a plate-shaped vacuum heat insulating material 14A is disposed between the outer box 12 and the heat insulating material 14 on the back side and the left and right side surfaces of the heat insulating box 11, and the heat insulating property of the heat insulating box 11 is further improved. improves. As the vacuum heat insulating material 14A, for example, an aggregate of fibers such as glass is stored in a storage bag made of a metal film such as aluminum, and the inside of the storage bag is in a vacuum state.

A cooling chamber 21 is formed behind the freezing chamber 16. Inside the cooling chamber 21, a cooler 22 which is an evaporator for cooling the cold air circulating in the refrigerator 10 is arranged. The cooler 22 is connected to a compressor 23, a radiator (not shown), and a capillary tube (not shown) via a refrigerant pipe (not shown), and constitutes a vapor compression refrigeration cycle circuit.

A blower 28 is disposed above the cooler 22 in the cooling chamber 21. The blower 28 is, for example, an axial blower. By operating the blower 28, the cool air cooled by the cooler 22 circulates in the refrigerating chamber 15 and the freezing chamber 16. The refrigerating compartment 15 is cooled to the refrigerating temperature zone, and the freezing compartment 16 is cooled to the freezing temperature zone. A defrost heater 29, which is energized during the defrosting operation and removes the frost formed on the cooler 22, is disposed below the cooler 22 in the cooling chamber 21.

Between the freezer compartment 16 and the cooling compartment 21, a freezer compartment airflow passage 26 defined by partition walls 24 and 25 made of synthetic resin is formed. The partition wall 24 partitions the cooling chamber 21 and the freezing chamber feed air passage 26, and the partition wall 25 partitions the freezing chamber 16 and the freezing chamber feed air passage 26. A blower port 27 is formed in the upper part of the partition wall 24, and cold air blown to the freezer compartment blower duct 26 passes therethrough.

The partition wall 25 is formed with a plurality of outlets 30 for blowing cool air to the freezing compartment 16, and the freezing compartment 16 is blown with cool air from the outlets 30. Further, a partition wall 31 made of synthetic resin is disposed below the partition walls 24 and 25, and a return port 32 and a freezer compartment return air passage 33 for returning the cold air in the freezer compartment 16 to the cooling room 21 are formed. Has been done.

As illustrated, the heat insulating partition wall 34 partitions the refrigerating chamber 15 and the freezing chamber 16 in the height direction. A partition wall 35 made of a synthetic resin is arranged behind the refrigerating compartment 15, and a refrigerating compartment feed air passage 36 is formed between the partition wall 35 and the inner box 13. The refrigerating compartment feed air passage 36 communicates with the freezer compartment feed air passage 26 via a damper 37. By the opening/closing operation of the damper 37, the cool air cooled in the cooling chamber 21 is blown to the refrigerating chamber air blowing path 36. Further, the partition wall 35 is formed with a plurality of outlets 38 for blowing cool air to the refrigerating chamber 15.

As shown in FIG. 2, the region surrounded by the dotted line 41 is the refrigerating chamber 15, and the region surrounded by the dotted line 42 is the freezing chamber 16. For convenience of description, structures related to air passages such as the refrigerating compartment feed air passage 36 and the freezer compartment feed air passage 26 are shown by solid lines.

A refrigerating compartment feed air passage 36 for supplying cold air to the refrigerating compartment 15 is disposed in the center of the back surface of the refrigerating compartment 15, and the refrigerating compartment feed air passage 36 is formed with a plurality of outlets 38. As shown by the arrow, the cool air supplied from the cooling chamber 21 (see FIG. 1B) is blown into the refrigerating chamber 15 from the blow-out port 38 which is a large opening provided at the top of the refrigerating chamber 15. At the same time, the air is blown into the refrigerating chamber 15 from the air outlet 38 having a small opening provided in the flow path on the way. With this structure, cold air can be efficiently supplied to the entire inside of the refrigerating chamber 15.

A refrigerating compartment return air passage 43 is formed on the right rear surface of the freezing compartment 16. Cold air circulating in the refrigerating compartment 15 flows into the refrigerating compartment return air passage 43 from a return port 44 provided on the lower right side of the refrigerating compartment 15. The refrigerating chamber return air passage 43 communicates with the cooling chamber 21 via a suction port 45 provided on the lower right side of the cooling chamber 21. The cool air flowing in the refrigerating compartment return air passage 43 is sucked into the cooling compartment 21 from the vicinity of the right end surface of the defrosting heater 29 arranged in the cooling compartment 21.

The freezer compartment air duct 26 for supplying cool air to the freezer compartment 16 is arranged over the rear surface of the freezer compartment 16, and the freezer compartment air duct 26 is formed with a plurality of outlets 30. As indicated by the arrow, the cool air supplied from the cooling chamber 21 (see FIG. 1B) is gradually blown into the freezing chamber 16 from the upper portion of the freezing chamber 16 through the outlet 30. Then, the cold air circulates in the freezer compartment 16 to cool the freezer compartment 16, and then the freezer compartment return air passage 33 (see FIG. 1B) via the return port 32 provided in the lower portion of the freezer compartment 16. Flows into the cooling chamber 21 and then is sucked into the cooling chamber 21.

FIG. 3 is an exploded perspective view illustrating the cooler 22 and the defrosting heater 29 of the refrigerator 10 according to the embodiment of the present invention, and is a view seen from the front of the refrigerator 10. FIG. 4 is a perspective view illustrating the refrigerating compartment return air passage 43 and the cooling compartment 21 of the refrigerator 10 according to the embodiment of the present invention, and is a view seen from the rear of the refrigerator 10. FIG. 5: is a figure explaining the structure in the cooling chamber 21 of the refrigerator 10 which concerns on embodiment of this invention, (A) is sectional drawing explaining the shape of the suction port 45 seen from the cooling chamber 21 side. , (B) are cross-sectional views illustrating the side wall 53 of the cooler 22 as viewed from the cooling chamber 21 side.

As shown in FIG. 3, the cooler 22 includes heat transfer tubes 51 arranged in multiple stages and multiple rows, a plurality of fins 52 arranged in parallel in the heat transfer tubes 51 at predetermined intervals, and heat transfer tubes 51 at each stage. It has a pair of side walls 53 and 54 for supporting the defrosting heater fixing portions 55 and 56 provided at the lower ends of the side walls 53 and 54.

The heat transfer tube 51 is, for example, an aluminum alloy tube, and the fins 52 are formed of an aluminum alloy plate material. In the present embodiment, the number of stages of the heat transfer tubes 51 is 7, and the parallel arrangement interval of the fins 52 of the 7th lowest stage is the widest, and the parallel arrangement interval of the fins 52 of the 6th stage is the 7th stage. It is a little narrower. The fins 52 from the first stage to the fifth stage are arranged side by side a little narrower than the sixth stage and have the same spacing.

Although details will be described later, in the lower right region of the cooler 22, the fins 52 are thinned and arranged from the fifth stage to the seventh stage. And the thinning interval of the fin 52 of the 7th step is widest. The thinning interval of the fin 52 is gradually narrowed to the sixth step and the fifth step.

The defrost heater fixing portion 55 is formed on the lower end side of the side wall 53, and is formed in a substantially U shape so that the rear side of the cooler 22 is opened. On the other hand, the defrost heater fixing portion 56 is formed on the lower end side of the side wall 54, and is formed in a substantially U shape so that the front side of the cooler 22 is opened.

The defrost heater 29 is, for example, an electric resistance heating type heater, and includes a glass tube 57 that accommodates a heater wire (not shown), a rubber support portion 58 that closes both ends of the glass tube 57, and a glass tube 57. The heater cover 59 covers the above from above. Then, the rubber support portion 58 and the heater cover 59 on both ends of the defrost heater 29 are fitted into the openings of the defrost heater fixing portions 55 and 56, respectively, so that the defrost heater 29 can be installed in the cooler 22. It is fixed below.

As shown in FIG. 4, the refrigerating compartment return air passage 43 is made of a synthetic resin tubular member, communicates with the refrigerating compartment 15 through a return port 44 (see FIG. 2), and also has a suction port 45 (see FIG. 2). And communicates with the cooling chamber 21. The refrigerating compartment return air passage 43 is a rear surface on the right side of the freezing compartment 16 and is arranged along the vertical direction of the cooling compartment 21.

The refrigerating compartment return air passage 43 extends vertically in a straight line, bends at a substantially right angle on the lower end side of the cooling compartment 21, and communicates with the cooling compartment 21. Here, the cold air flowing in the refrigerating compartment return air passage 43 is pressed downward in the bent region of the refrigerating compartment return air passage 43 indicated by a circle 61, so that the flow of the cool air deteriorates.

However, in the present embodiment, as indicated by the circle 61, in the bent region of the refrigerating compartment return air passage 43, the surface on which the cool air collides is made as gentle as possible, so that the cool air enters the cooling chamber 21. It is easy to flow.

In addition, in the vicinity of the suction port 45 (see FIG. 2) of the cooling chamber 21 indicated by the circle 62, the back wall 13A of the inner box 13 (see FIG. 1(B)) forming the cooling chamber 21 has the refrigerator 10 A bulging portion 63 that bulges rearward in the depth direction is formed. The bulging portion 63 has the widest bulging width at the right end portion of the rear wall 13A where the suction port 45 is located, and gradually narrows the bulging width while at least about 1/3 in the lateral width direction of the cooling chamber 21. It is formed over.

By forming the bulging portion 63 on the back wall 13A of the cooling chamber 21, the thickness of the heat insulating material 14 (see FIG. 1(B)) is reduced, so that the area where the bulging portion 63 is arranged is cool. Arbitrary design changes are possible in consideration of flowability and heat insulation.

As shown in FIG. 5(A), a refrigerating compartment return air passage 43 communicates with the cooling compartment 21 on the right side wall 13B of the inner box 13 (see FIG. 1(B)) that constitutes the cooling compartment 21. A suction port 45 is formed. Then, the side wall 13</b>B has a lower end periphery protruding toward the rear side in the depth direction of the refrigerator 10 in accordance with the formation region of the bulging portion 63. As described above with reference to FIG. 4, the bulging portion 63 has the largest bulging width on the right end portion side of the back wall 13A, and thus the protruding width of the side wall 13B also becomes wide.

The suction port 45 is mainly formed in a region of the side wall 53 facing the defrosting heater fixing portion 55, and is also enlarged to a region where the bulging portion 63 is provided. The opening area of the suction port 45 is the same as or larger than the flow passage area of the refrigerating compartment feed air passage 36 in the region where the damper 37 (see FIG. 2) is arranged. With this structure, the amount of cold air sucked into the cooling chamber 21 is secured, the cold air is prevented from staying around the suction port 45 of the refrigerating chamber return air passage 43, and the cooling efficiency of the refrigerator 10 is prevented from being deteriorated. ..

As shown in FIG. 5B, in the lateral width direction of the cooling chamber 21, the side wall 53 of the cooler 22 and the end surface of the defrosting heater 29 partially overlap with the formation region of the suction port 45. As described above with reference to FIG. 3, the defrost heater fixing portion 55 of the cooler 22 is formed such that the area where the bulging portion 63 is disposed behind the cooler 22 is open. That is, since the defrost heater fixing portion 55 is formed on the front side of the side wall 53, the defrost heater 29 can be supported even when the rear side of the side wall 53 is cut away.

With this structure, a cutout region 53A is formed in the side wall 53 in the region facing the suction port 45. The cutout region 53A is formed not only in the region facing the suction port 45 but also up to the upper side of the suction port 45. As a result, the flow of the cool air that flows into the cooling chamber 21 from the refrigerating chamber return air passage 43 is less likely to be blocked by the end faces of the side wall 53 and the defrosting heater 29. Then, the cool air easily flows into the inner side of the cooling chamber 21 by utilizing the space of the bulging portion 63 and the cutout region 53A.

Furthermore, as described above with reference to FIG. 3, in the region on the lower right side of the cooler 22, the fins 52 are thinned and arranged from the fifth stage to the seventh stage. With this structure, the cool air sucked into the cooling chamber 21 through the suction port 45 secures the flow path of the cool air in the cooling chamber 21 by the bulging portion 63 (see FIG. 4) and the thinned region of the fin 52, and the cool air is cooled. Can be easily distributed to the entire cooler 22. As a result, even when frost forms on the suction port 45 side of the cooler 22, the cooling efficiency of the refrigerator 10 is prevented from deteriorating because the cool air spreads throughout the cooler 22.

Further, in the cooling chamber 21, in order to smooth the flow of the cool air around the suction port 45, the defrosting heater fixing portion 55 is formed so that the bulging portion 63 rearward of the cooler 22 is open on the side of the area where the bulging portion 63 is disposed. Has been done. On the other hand, the defrost heater fixing portion 56 is formed so that the front side of the cooler 22 is open. Since the openings are staggered in the depth direction of the cooling chamber 21, the defrosting heater 29 can be attached/detached using the space of the bulging portion 63.

For example, when the wiring to the defrosting heater 29 is disconnected during the manufacturing process after the cooler 22 and the defrosting heater 29 are attached to the inside of the refrigerator, the space of the bulging portion 63 is used first, The cooler 22 can be removed from the defrost heater fixing portion 55 side. As a result, a structure in which the workability of attaching/detaching the defrost heater 29 is taken into consideration is realized despite the narrow work area in the cooling chamber 21.

In the present embodiment, the case where the suction port 45 is formed near the lower right end of the cooling chamber 21 has been described, but the present invention is not limited to this case. For example, the suction port 45 may be formed near the lower left end of the cooling chamber 21. In this case, the defrost heater fixing portion 55 and the bulging portion 63 are also formed on the left side of the cooling chamber 21, so that the same effect as the above-described effect can be obtained. In addition, various modifications can be made without departing from the scope of the present invention.

10 Refrigerator 11 Insulation Box 13 Inner Box 13A Back Wall 13B Side Wall 15 Refrigerator 16 Freezer 21 Cooling Room 22 Cooler 24, 25, 31, 35 Partition Wall 26 Freezer Air Vent 29 Defrost Heater 33 Freezer Return Air Channel 36 Refrigerating room air feeding path 37 Damper 43 Refrigerating room returning air path 45 Suction port 51 Heat transfer tube 52 Fins 53, 54 Side wall 53A Cutout area 55, 56 Defrost heater fixing part 63 Swelling part

Claims (4)

A storage chamber formed inside the heat insulating box,
A cooling chamber in which a cooler for cooling the cold air supplied to the storage chamber is arranged, and a defrost heater attached to the lower end of the cooler for removing frost formed on the cooler is arranged. When,
A return air path for returning the cold air supplied to the storage chamber to the cooling chamber,
One end side of the defrost heater is detachably attached to the rear side in the depth direction of the cooling chamber, and the other end side of the defrost heater is attached to the front side in the depth direction of the cooling chamber. It is detachably attached,
On the side wall of the cooling chamber facing the end surface on the one end side of the defrost heater, a suction port through which the return air passage communicates is formed,
The refrigerator is characterized in that a side wall of the cooler facing the suction port is formed with a cutout region in which at least a part of a rear side in the depth direction of the cooling chamber is cut out. On the back wall of the cooling chamber, there is a bulging portion along the arrangement area of the defrost heater, at least a part of which bulges toward the rear side in the depth direction of the cooling chamber from the suction port side. The refrigerator according to claim 1, wherein the refrigerator is formed. The refrigerator according to claim 2, wherein the suction port is open to the side wall of the cooling chamber arranged in the region where the bulging portion is formed. A blower duct for blowing the cool air from the cooling chamber to the storage chamber,
Further comprising a damper disposed in the feed air passage,
The refrigerator according to claim 3, wherein an opening area of the suction port is configured to be the same as or wider than a flow path area of a region where the damper is disposed in the air blowing path.

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