CN112204320B

CN112204320B - Refrigerator with a door

Info

Publication number: CN112204320B
Application number: CN201980028187.7A
Authority: CN
Inventors: 青木均史; 土田俊之
Original assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd; Aqua Co Ltd
Current assignee: Qingdao Haier Refrigerator Co Ltd; Haier Smart Home Co Ltd; Aqua Co Ltd
Priority date: 2018-12-27
Filing date: 2019-12-06
Publication date: 2022-11-22
Anticipated expiration: 2039-12-06
Also published as: WO2020134971A1; CN112204320A; JP2020106214A; JP7221519B2

Abstract

A refrigerator (10) in which a refrigerating compartment return air passage (43) communicates with a cooling chamber (21) through a suction port (45), and a cutout region (53A) corresponding to the suction port (45) is provided in a side wall (53) of a cooler (22). The flow of the cold air around the suction port (45) of the cooling chamber (21) is smooth, the air quantity sucked into the cooling chamber (21) is ensured, the cold air is prevented from being retained around the suction port (45), and the cooling efficiency of the refrigerator (10) is prevented from being deteriorated.

Description

Refrigerator

Technical Field

The present invention relates to a refrigerator that cools and stores food and the like in a storage compartment, and more particularly, to a refrigerator that increases the flow of cool air at a suction port of a cooling compartment communicating with a return air duct and its periphery, and ensures the amount of return air to the cooling compartment.

Background

As the existing refrigerator 100, a configuration shown in fig. 6 is known. Fig. 6 is a front view illustrating a flow of cool air returning to the cooling chamber 101 of the refrigerator 100.

As shown in fig. 6, a defrosting heater 102, a cooler 103, and an indoor fan 104 are disposed in a cooling chamber 101 of a refrigerator 100, mainly from the lower side thereof. Refrigerating room return duct 105 is disposed on the right side of cooling room 101, and suction port 107 is formed in side wall 106 near the right lower end of cooling room 101. Refrigerating room return duct 105 communicates with cooling room 101 through suction port 107.

Arrow 108 shows the cold air returned from the refrigerator compartment (not shown) to cooling compartment 101, but the cold air flows into cooling compartment 101 after changing its flow direction by substantially 90 degrees based on return portion 109 at the lower end of refrigerator compartment return duct 105. Then, the cold air flowing into cooling compartment 101 flows to the upper side of cooling compartment 101 by the suction force of indoor fan 104, but at this time, the cold air is cooled again to a desired temperature by heat exchange with cooler 103 (for example, see patent document 1).

Patent document 1: JP-A2015-7510.

As shown in fig. 6, in refrigerator 100, refrigerating compartment return air duct 105 communicates with cooling compartment 101 via suction port 107 formed in side wall 106 of cooling compartment 101. Cold air returned from the refrigerating compartment flows into cooling compartment 101 after changing its flow direction by substantially 90 degrees based on return portion 109 at the lower end of refrigerating compartment return duct 105.

With this structure, the cold air flowing in refrigerating room return duct 105 is pushed downward by return portion 109 near suction port 107. Then, the cold air flows into cooling compartment 101 through suction port 107 while maintaining this state. As a result, when the opening area of suction port 107 is small, it is difficult to secure the flow path area of the cooled air at suction port 107, and the amount of cooled air sucked into cooling compartment 101 cannot be sufficiently secured, which may deteriorate the cooling efficiency.

In cooling compartment 101, defrosting heater 102 and cooler 103 are disposed near suction port 107, and defrosting heater 102 and cooler 103 block the flow of cold air flowing into cooling compartment 101. Further, the cold air flowing into cooling compartment 101 is not only weakened in potential by the above-described obstruction, but also hardly flows to the back side of cooling compartment 101, and the cold air cannot reach the entire cooler 103. As a result, if frost forms on the suction port 107 side of the cooler 103, it becomes difficult to secure a flow path for the cold air in the cooling chamber 101, and cooling efficiency may deteriorate.

Disclosure of Invention

The invention aims to provide a refrigerator, which improves the flow of cold air at the suction inlet of a cooling chamber communicated with a return air duct and the periphery of the suction inlet and ensures the return air volume of the cold air to the cooling chamber.

In order to achieve the above object, the present invention provides a refrigerator including a storage compartment formed in an interior of a heat-insulating box, a cooling compartment provided with a cooler for cooling cold air supplied to the storage compartment, and a defrosting heater attached to a lower end of the cooler for removing frost formed by the cooler, and a return air path; the return air duct returns the cold air supplied to the storage chamber to the cooling chamber. One end of the defrosting heater is detachably mounted on the cooler from back to front along the depth direction of the cooling chamber, and the other end of the defrosting heater is detachably mounted on the cooler from front to back along the depth direction of the cooling chamber; a suction port communicating with the return air passage is formed in a side wall of the cooling chamber facing one end of the defrosting heater, and a cutout region is formed in a side wall of the cooler facing the suction port.

Further, the cutout region is provided at least on a rear side of the side wall of the cooler in a depth direction of the cooling chamber.

Further, a portion of the rear wall of the cooling chamber on the side closer to the suction port is formed with an expansion portion expanding rearward.

Further, the expansion part has the widest expansion amplitude on the side close to the suction port, and the expansion amplitude of the expansion part is gradually narrowed along the transverse direction.

Further, the expansion part extends along the transverse direction for a length no less than 1/3 of the width of the cooling chamber.

Further, the cooler has a plurality of layers of heat transfer tubes and fins arranged at intervals on the heat transfer tubes, and the fins in the lowermost layer are arranged side by side at the widest intervals.

Further, in the cooler lower region, the fin interval on the side close to the suction port is larger than the fin interval on the side far from the suction port.

Further, the refrigerator further includes a feed air passage that sends the cold air from the cooling chamber to the storage chamber, and a damper provided in the feed air passage; the opening area of the suction port is equal to or larger than the flow path area of the area where the damper is disposed in the feed air path.

The invention has the technical effects that: the notch area formed on the side wall of the cooling chamber opposite to the suction port enables the cold air returning to the cooling chamber from the return air passage to flow smoothly near the suction port of the cooling chamber, and ensures the air volume of the cold air returning to the cooling chamber. Further, the attaching and detaching direction of the defrosting heater on the suction port side is set to the rear side of the cooling chamber, and the attaching and detaching direction of the defrosting heater on the opposite side of the suction port is set to the front side of the cooling chamber, thereby facilitating the attaching and detaching operation of the defrosting heater to the lower end of the cooler.

Drawings

Fig. 1 (a) is a perspective view of a refrigerator according to an embodiment of the present invention, as viewed from the front; fig. 1 (B) is a side sectional view showing a refrigerator according to an embodiment of the present invention.

Fig. 2 is a front view illustrating an air passage of cool air circulating in the refrigerator according to the embodiment of the present invention.

Fig. 3 is a perspective view showing a cooler and a defrosting heater of a refrigerator according to an embodiment of the present invention.

Fig. 4 is a perspective view showing a refrigerating compartment return air duct and a cooling compartment of the refrigerator according to the embodiment of the present invention.

Fig. 5 (a) is a cross-sectional view showing a side wall of a cooling chamber of a refrigerator according to an embodiment of the present invention; fig. 5 (B) is a cross-sectional view showing a side wall of a cooler in a cooling chamber of a refrigerator according to an embodiment of the present invention.

Fig. 6 is a front view showing a return flow of cool air to a cooling chamber of a refrigerator in the related art.

10-a refrigerator; 11-a heat insulation box body; 13-inner container; 13A-back wall; 13B-side wall; 14-a thermal insulation material; 14A-vacuum insulation; 15-a refrigerating chamber; 16-a freezing chamber; 17. 18, 19, 20-insulated doors; 21-a cooling chamber; 22-a cooler; 23-a compressor; 24. 25, 31, 35-partition walls; 26-refrigerating chamber feeding air path; 27-air supply outlet; 28-a fan; 29-a defrost heater; 30. 38-an air outlet; 32. 44-air return; 33-a refrigerating chamber return air path; 36-refrigerating chamber feeding air path; 37-a damper; 43-refrigerating chamber return air path; 45-suction inlet; 51-heat transfer tubes; 52-a fin; 53. 54-a side wall; 53A-a notch region; 55. 56-defrost heater securing portion; 57-glass tube; 58-a rubber support; 59-heater shield; 63-expansion part.

Detailed Description

The drawings are for illustrative purposes only and are not to be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.

Hereinafter, the refrigerator 10 according to the embodiment of the present invention will be described in detail based on the drawings. In the description of the present embodiment, the same members are denoted by the same reference numerals in principle, and redundant description thereof will be omitted. In the following description, the vertical direction represents the height direction of the refrigerator 10, the horizontal direction represents the lateral width direction of the refrigerator 10, and the front-rear direction represents the depth direction of the refrigerator 10. Also, the left and right direction described above shows a left and right direction in a case where the refrigerator 10 is viewed from the front.

Fig. 1 (a) is a perspective view illustrating a schematic structure of a refrigerator 10 according to an 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 illustrating a schematic structure of a refrigerator 10 according to an embodiment of the present invention. Fig. 2 is a front view illustrating an air passage of cool air circulating in the refrigerator 10 according to the embodiment of the present invention. Further, the direction in which the cold air circulates is indicated by an arrow.

As shown in fig. 1 (a), the refrigerator 10 includes a heat-insulating box 11 as a main body, and a storage chamber for storing foods and the like is formed inside the heat-insulating box 11. As the storage chambers, a refrigerating chamber 15 (see fig. 1B) and a freezing chamber 16 (see fig. 1B) are formed from the upper stage.

The heat-insulating doors 17 and 18 are provided to open and close an opening in the front surface of the refrigerating chamber 15 of the heat-insulating box 11. The heat insulating door 17 is rotatably attached to the heat insulating box 11 at right upper and lower end portions thereof as viewed from the front, and the heat insulating door 18 is rotatably attached to the heat insulating box 11 at left upper and lower end portions thereof as viewed from the front.

The heat-insulating doors 19, 20 are used to open or close the opening of the front surface of the freezing chamber 16 of the heat-insulating box 11. The heat insulating door 19 is rotatably attached to the heat insulating box 11 at right upper and lower end portions thereof as viewed from the front, and the heat insulating door 20 is rotatably attached to the heat insulating box 11 at left upper and lower end portions thereof as viewed from the front.

As shown in fig. 1 (B), a heat-insulated box 11 as a main body of a refrigerator 10 includes: a steel plate case 12 having an opening on the front surface; and a synthetic resin inner container 13 having an open front surface and disposed with a gap in the housing 12. A heat insulating material 14 made of foamed polyurethane is filled in a gap between the outer case 12 and the inner container 13. The

heat insulation doors

17, 18, 19, and 20 also have a heat insulation structure as in the heat insulation box 11.

Further, a plate-like vacuum heat insulating material 14A is disposed between the casing 12 and the heat insulating material 14 on the rear surface 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 improved. The aggregate of fibers such as glass as the vacuum heat insulating material 14A is stored in a storage bag made of a metal film such as aluminum, and the interior of the storage bag is brought into a vacuum state.

Behind the freezing chamber 16, a cooling chamber 21 is formed. An evaporator is disposed as a cooler 22 in the cooling chamber 21, and the cooler 22 cools air circulating in the refrigerator 10. 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.

A fan 28 is disposed above the cooler 22 in the cooling chamber 21. The fan 28 is, for example, an axial fan. The fan 28 operates so that the cold air cooled by the cooler 22 circulates in the refrigerating chamber 15 and the freezing chamber 16. The refrigerating compartment 15 is cooled to a refrigerating temperature range and the freezing compartment 16 is cooled to a freezing temperature range. A defrosting heater 29 is disposed below the cooler 22 in the cooling chamber 21, and the defrosting heater 29 is energized during defrosting operation to remove frost condensed in the cooler 22.

Freezing room air supply duct 26 partitioned by partition walls 24 and 25 made of synthetic resin is formed between freezing room 16 and cooling room 21. Partition wall 24 partitions cooling compartment 21 and freezer compartment air-feeding duct 26, and partition wall 25 partitions freezer compartment 16 and freezer compartment air-feeding duct 26. A blowing port 27 is formed in an upper portion of partition wall 24, and cool air is supplied from blowing port 27 to freezer compartment intake air duct 26.

Partition wall 25 is formed with a plurality of blow-out ports 30 for sending cold air to freezing chamber 16, and cold air is sent from blow-out ports 30 to freezing chamber 16. Further, a synthetic resin partition wall 31 is disposed below partition walls 24 and 25, and a return air inlet 32 for returning cold air in freezing room 16 to cooling room 21 and a freezing room return air passage 33 are formed.

As shown in the drawing, the insulating partition wall 34 partitions the refrigerating compartment 15 and the freezing compartment 16 in the height direction. A partition wall 35 made of synthetic resin is disposed behind the refrigerating compartment 15, and a refrigerating compartment air supply passage 36 is formed between the partition wall 35 and the inner container 13. Refrigerating compartment feed air passage 36 communicates with freezing compartment feed air passage 26 via damper 37. Cold air cooled by cooling compartment 21 is blown into refrigerating compartment feed air passage 36 by opening and closing operation of damper 37. Further, partition wall 35 is formed with a plurality of air outlets 38 for sending cooled air to refrigerating room 15.

As shown in fig. 2, a region surrounded by a dotted line 41 is the refrigerating compartment 15, and a region surrounded by a dotted line 42 is the freezing compartment 16. For convenience of explanation, the configurations of air passages such as refrigerating compartment air supply passage 36 and freezing compartment air supply passage 26 are shown by solid lines.

Refrigerating room feed air duct 36 for supplying cold air to refrigerating room 15 is disposed in the center of the rear surface of refrigerating room 15, and a plurality of blow-out ports 38 are formed in refrigerating room feed air duct 36. As shown by arrows, the cold air supplied from cooling compartment 21 (see fig. 1B) is not only sent into refrigerating compartment 15 from air outlet 38 having a large opening provided at the uppermost portion of refrigerating compartment 15, but also sent into refrigerating compartment 15 from air outlet 38 having a small opening provided at the lower portion thereof. With this configuration, the cold air can be efficiently supplied to the entire interior of the refrigerating compartment 15.

Refrigerating compartment return air duct 43 is formed on the rear surface on the right side of freezing compartment 16. The cold air circulating in refrigerating compartment 15 flows into refrigerating compartment return air duct 43 from return air inlet 44 provided in the lower right portion of refrigerating compartment 15. Refrigerating room return air passage 43 communicates with cooling room 21 via suction port 45 provided on the lower right side of cooling room 21. The cold air flowing through refrigerating compartment return air duct 43 is sucked into cooling compartment 21 from the periphery of the right end surface of defrosting heater 29 disposed in cooling compartment 21.

Freezing chamber feed air duct 26 for supplying cold air to freezing chamber 16 is provided on the entire back surface of freezing chamber 16, and a plurality of blow-out ports 30 are formed in freezing chamber feed air duct 26. As shown by arrows, the cold air supplied from cooling chamber 21 (see fig. 1B) is gradually sent from the upper portion of freezing chamber 16 into freezing chamber 16 through air outlet 30. The cold air circulates in the freezing chamber 16, cools the freezing chamber 16, flows into a freezing chamber return air duct 33 (see fig. 1B) through a return air opening 32 provided in a lower portion of the freezing chamber 16, and is then 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 refrigerating compartment return air duct 43 and cooling compartment 21 of refrigerator 10 according to the embodiment of the present invention, and is a view seen from the rear of refrigerator 10. Fig. 5 is a diagram illustrating a structure in the cooling chamber 21 of the refrigerator 10 according to the embodiment of the present invention, where (a) is a cross-sectional view illustrating a shape of the suction port 45 viewed from the cooling chamber 21 side, and (B) is a cross-sectional view illustrating a side wall 53 of the cooler 22 viewed from the cooling chamber 21 side.

As shown in fig. 3, the cooler 22 has: the heat exchanger tube 51 is arranged in a plurality of layers and rows, a plurality of fins 52 arranged side by side at predetermined intervals on the heat exchanger tube 51, a pair of side walls 53 and 54 supporting the heat exchanger tube 51 of each layer, and 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 a plate material made of an aluminum alloy. In the present embodiment, the number of heat transfer tubes 51 is 7, the arrangement interval of the fins 52 in the 7 th layer, which is the lowermost layer, is the widest, and the arrangement interval of the fins 52 in the 6 th layer is slightly narrower than that in the 7 th layer. The fins 52 of the 1 st to 5 th layers are arranged side by side at a uniform interval and are slightly narrower than those of the 6 th layer.

Specifically, in the right lower region of the cooler 22, the interval between the fins 52 arranged from the 5 th layer to the 7 th layer is larger than the interval between the fins 52 of each layer in the left region. The interval between the fins 52 of the 7 th layer is the widest, and gradually narrows from the 7 th layer toward the 6 th and 5 th layers.

The defrosting heater fixing portion 55 is formed at the lower end side of the side wall 53, and is provided in a substantially U shape so as to open to the rear side of the cooler 22. On the other hand, the defrosting heater fixing portion 56 is formed at the lower end side of the side wall 54 and is provided in a substantially U shape so as to open to the front side of the cooler 22.

The defrosting heater 29 is, for example, a resistance heating type heater, and includes: a glass tube 57 for housing a heater wire (not shown), a rubber support 58 for closing both ends of the glass tube 57, and a heater cover 59 for covering the glass tube 57 from above. The rubber support portions 58 and the heater covers 59 on both end sides of the defrosting heater 29 are fitted into the openings of the defrosting heater fixing portions 55 and 56, respectively, and the defrosting heater 29 is fixed below the cooler 22.

As shown in fig. 4, refrigerating compartment return air passage 43 is formed of a synthetic resin tubular member, and communicates with refrigerating compartment 15 through return air opening 44 (see fig. 2), and communicates with cooling compartment 21 through suction opening 45 (see fig. 2). Refrigerating room return air duct 43 is a rear surface on the right side of freezing room 16, and is disposed along the vertical direction of cooling room 21.

Refrigerating compartment return air duct 43 extends straight in the vertical direction, and is bent substantially at a right angle at the lower end side of cooling compartment 21 so as to communicate with cooling compartment 21. Here, the cold air flowing in refrigerating compartment return air passage 43 is pushed downward in the bent region of refrigerating compartment return air passage 43 indicated by circle 61, and the smooth flow of the cold air is impaired.

However, in the present embodiment, as indicated by the circular mark 61, the surface on which the cold air collides in the curved region of the refrigerating compartment return air passage 43 is formed into a curved surface as gentle as possible, so that the cold air can easily flow into the cooling compartment 21.

In addition, an expansion portion 63 that expands toward the rear side in the depth direction of the refrigerator 10 is formed on the rear wall 13A of the inner container 13 (see fig. 1B) constituting the cooling chamber 21 around the suction port 45 (see fig. 2) of the cooling chamber 21 indicated by a circle symbol 62. The right side end portion of the expansion portion 63 located close to the suction port 45 has the widest expansion width, the expansion width of the expansion portion 63 is gradually narrowed from right to left, and the expansion portion 63 extends at least by a distance of about 1/3 in the lateral direction of the cooling chamber 21.

Further, by forming the expanded portion 63 in the rear wall 13A of the cooling chamber 21, the thickness of the heat insulating material 14 (see fig. 1B) is reduced, and the arrangement region of the expanded portion 63 can be arbitrarily changed in design while comprehensively considering the ease of fluidity of the cold air and the heat insulating property.

As shown in fig. 5 a, suction port 45 for communicating refrigerating room return air passage 43 with cooling chamber 21 is formed in right side wall 13B of inner tub 13 (see fig. 1B) constituting cooling chamber 21. The side wall 13B is formed in a region where the bulging portion 63 is formed, and the periphery of the lower end portion thereof protrudes rearward in the depth direction of the refrigerator 10. As shown in fig. 4, the right side end portion of the back surface wall 13A expands the widest, and therefore the side wall 13B also protrudes the widest.

The suction port 45 is formed mainly in a region facing the defrosting heater fixing portion 55 of the side wall 53, and is formed to extend to the arrangement region of the expansion portion 63. The opening area of suction port 45 is equal to or wider than the flow path area of the region where damper 37 (see fig. 2) is disposed in refrigerating room feed air passage 36. With this structure, the volume of the cold air sucked into cooling compartment 21 is ensured, and the cold air is prevented from staying around suction port 45 of refrigerating compartment return air duct 43, thereby preventing deterioration of the cooling efficiency of refrigerator 10.

As shown in fig. 5 (B), the side wall 53 of the cooler 22 and the end surface of the defrosting heater 29 partially overlap the formation region of the suction port 45 in the width direction of the cooling chamber 21. As shown in fig. 3, the defrosting heater fixing portion 55 of the cooler 22 is open toward the arrangement region side of the expansion portion 63 on the rear side. That is, the defrosting heater fixing portion 55 is formed on the front side of the side wall 53, so that the defrosting heater 29 can be supported even if the rear side of the side wall 53 is cut off.

With this structure, a cutout area 53A is formed in the side wall 53 in the area facing the suction port 45. The cutout region 53A is formed not only in the region facing the suction port 45 but also above the suction port 45. As a result, the flow of the cold air flowing from refrigerating compartment return air duct 43 into cooling compartment 21 is not obstructed by side wall 53 and the end surface of defrosting heater 29. The cold air is likely to flow into the back side of the cooling compartment 21 by the space of the expansion portion 63 and the cutout region 53A.

Further, as shown in fig. 3, in the region of the right lower portion of the cooler 22, the fins 52 of each layer are distributed gradually sparsely from the 5 th layer to the 7 th layer. With this configuration, a flow path of the cold air in the cooling compartment 21 is ensured, and the cold air sucked into the cooling compartment 21 from the suction port 45 is smoothly sent to the entire cooler 22 through the expansion portion 63 (see fig. 4) and the gap region between the fins 52. As a result, even if frost forms on the suction port 45 side of the cooler 22, the cold air is transmitted to the entire cooler 22, and the cooling efficiency of the refrigerator 10 is prevented from deteriorating.

In the cooling compartment 21, the defrosting heater fixing portion 55 is formed to be opened toward the expansion portion 63 side in the rear of the cooler 22 in order to smooth the flow of the cold air around the suction port 45. On the other hand, the defrosting heater fixing portion 56 is formed to open toward the front side of the cooler 22. The opening directions are different from each other in the depth direction of the cooling chamber 21, and the defrosting heater 29 can be attached and detached by using the space of the expansion portion 63.

For example, in the manufacturing process after the cooler 22 and the defrosting heater 29 are mounted in the refrigerator, when the defrosting heater 29 is disconnected, the space of the expansion portion 63 can be used to remove the defrosting heater 29 from the defrosting heater fixing portion 55 side. As a result, although the structure in the cooling chamber 21 is narrow, it is considered that the defrosting heater 29 is attached and detached.

In the present embodiment, the case where the suction port 45 is formed near the right lower 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 left lower end of the cooling chamber 21. In this case, the defrosting heater fixing portion 55 and the expansion portion 63 are also formed on the left side of the cooling chamber 21, and thus the same effects as those described above can be obtained. In addition, various modifications can be made without departing from the scope of the present invention.

Claims

1. A refrigerator, characterized by comprising:

a storage chamber formed inside the heat-insulating box body;

a cooling chamber in which a cooler for cooling the cold air supplied to the storage chamber is disposed, and a defrosting heater installed at a lower end of the cooler for removing frost formed by the cooler is disposed; and

a return air passage for returning the cold air supplied to the storage chamber to the cooling chamber,

one end of the defrosting heater is detachably mounted on the cooler from the rear to the front in the depth direction of the cooling chamber, and the other end of the defrosting heater is detachably mounted on the cooler from the front to the rear in the depth direction of the cooling chamber,

a suction port communicating with the return air passage is formed in a side wall of the cooling chamber facing one end of the defrosting heater,

a cutout region is formed in a side wall of the cooler opposite to the suction port;

the part of the back wall of the cooling chamber close to the suction inlet is expanded backwards to form an expansion part;

the cooler has a defrosting heater fixing portion facing the suction port, and the defrosting heater fixing portion is formed to be open to the expansion portion side in the rear of the cooler.

2. The refrigerator according to claim 1, wherein the notch region is provided at least on a rear side of the side wall of the cooler in a depth direction of the cooling chamber.

3. The refrigerator according to claim 1,

the side of the expansion part close to the suction port has the widest expansion amplitude, and the expansion amplitude of the expansion part is gradually narrowed along the transverse direction.

4. The refrigerator according to claim 1,

the length of the expansion part extending along the transverse direction is not less than 1/3 of the width of the cooling chamber.

5. The refrigerator according to claim 1,

the cooler is provided with a plurality of layers of heat transfer pipes and fins arranged on the heat transfer pipes at intervals, and the fins at the lowest layer are arranged side by side at the widest intervals.

6. The refrigerator according to claim 5,

in the lower region of the cooler, the fin interval on the side close to the suction port is larger than the fin interval on the side far from the suction port.

7. The refrigerator according to claim 1,

the refrigerator further includes:

a supply air passage for sending the cold air from the cooling chamber to the storage chamber; and

a damper disposed in the feeding air passage,

the opening area of the suction port is equal to or larger than the flow path area of the area where the damper is disposed in the feed air path.