WO2017138109A1

WO2017138109A1 - Refrigerator

Info

Publication number: WO2017138109A1
Application number: PCT/JP2016/053943
Authority: WO
Inventors: 安田　直史
Original assignee: 三菱電機株式会社
Priority date: 2016-02-10
Filing date: 2016-02-10
Publication date: 2017-08-17
Also published as: AU2016392120A1; JP6444543B2; CN206583180U; TW201736791A; CN107062748B; TWI671499B; MY192683A; SG11201806147UA; JPWO2017138109A1; AU2016392120B2; CN107062748A

Abstract

A refrigerator equipped with: storage compartments for freezing or refrigerating food items; a cooling compartment housing a cooler that generates cold air for cooling the storage compartments, and a heater that is provided below the cooler and that melts frost adhering to the cooler; and a barrier wall that separates the storage compartments and the cooling compartment from each other. A cold air return opening, which has a first opening surface opening on the cooling compartment side and a second opening surface opening on the storage compartment side, and which connects the storage compartments and the cooling compartment, enabling return air from the storage compartments to flow into the cooling compartment, and louver plates, which are provided in the cold air return opening and slant downward from the storage compartment side toward the cooler side, are formed in the barrier wall. The minimum interval in a gap formed between the first opening surface of the cold air return opening and the storage-compartment-side surface of the cooler is equal to or less than the minimum interval in a gap formed between the cooling-compartment-side surface of the barrier wall and the storage-compartment-side surface of the cooler.

Description

refrigerator

The present invention relates to a refrigerator with improved cooling performance.

In recent years, various efforts have been made to save energy in electrical products from the viewpoint of protecting the global environment.
In refrigerators that store and store foods and the like, there is a high interest in energy saving, and there is an increasing need for refrigerators that can store foods and the like more efficiently. Recently, the number of couples working together has increased, and there is an increasing need for large-capacity refrigerators that can handle large-scale purchases of food at once.

In order to meet these needs, refrigerators with high energy saving and large capacity have been proposed and put into practical use.

A conventional refrigerator is provided with a cooling chamber on the back side of each storage room such as a freezing room and a refrigeration room, and the cool air generated by a cooler in the cooling room is sent to each storage room by a blower fan. The food stored in the container is cooled.

A barrier wall is provided between each storage chamber and the cooling chamber, and a clearance is provided between the barrier wall and the cooler in the cooling chamber. The shut-off wall is provided with a cold air return port through which each storage chamber communicates with the cooling chamber, and the return air from the storage chamber whose temperature has risen by cooling the storage chamber flows into the cooling chamber. In addition, a plurality of wind direction plates are formed in the cool air return port to efficiently flow the return air from the storage chamber into the cooling chamber.

In such a refrigerator, when the cooler provided in the cooling chamber generates cold air, the surface temperature decreases to about −25 ° C. Therefore, frost is generated on the surface of the cooler when heat exchange is performed with the return air containing water vapor flowing from each storage into the cooling chamber.

If frost is generated on the surface of the cooler in this way, it affects the performance of the cooler such as an increase in the air path resistance of the cooler and a decrease in heat exchange capacity, resulting in a reduction in energy saving. Therefore, the conventional refrigerator is provided with a heater for melting the frost attached to the cooler. When heat from the heater is transmitted to the cooler, the frost attached to the surface of the cooler is melted. And when the melted frost is dripped as defrost water, the frost adhering to the surface of the cooler can be removed.

Here, defrost water generated by melting of frost is dripped downward as it is, but at that time, it may be dripped on the wind direction plate of the cool air return port. Thus, if the defrost water dripped on the wind direction plate stays on the wind direction plate as it is, the defrost water becomes frost again, and the cold air return port may be blocked. When the cold air return port is blocked, the circulation of air in the refrigerator is hindered, and it is difficult to normally cool each storage chamber.

Therefore, in order to prevent the cold air return port from being blocked due to such frost, a structure is provided in which a space is provided between the wind direction plate and the cooler to prevent dripping of defrost water generated by melting of the frost onto the wind direction plate. Has been proposed (for example, Patent Document 1 and Patent Document 2).
Thereby, in addition to preventing the defrost water from dripping onto the wind direction plate, it is possible to prevent frost and dew in the storage chamber due to the entry of the defrost water into the storage chamber.

JP 2012-237520 A JP 2013-139882 A

However, in the structures described in Patent Document 1 and Patent Document 2, from the viewpoint of the capacity of the storage room, an unnecessary space is provided in the refrigerator, so that the capacity of the storage room is sacrificed. There was a point.

The present invention has been made in view of the problems in the above-described conventional technology, and an object thereof is to provide a refrigerator capable of realizing a larger-capacity refrigerator while ensuring cooling quality.

The refrigerator of the present invention includes a storage chamber that performs at least one of freezing and refrigeration of food, a cooler that is provided on the back side of the storage chamber, and that generates cool air that cools the storage chamber, and below the cooler A cooling chamber in which a heater for melting frost attached to the cooler is housed; and a blocking wall that separates the storage chamber and the cooling chamber from each other. It has a first opening surface that opens and a second opening surface that opens to the storage chamber side so that the storage chamber communicates with the cooling chamber, and the return air from the storage chamber flows into the cooling chamber. A cold air return port, and a wind direction plate provided in the cold air return port and inclined downward from the storage chamber side toward the cooler side, the first opening surface of the cold air return port and the Formed between the storage chamber side surface of the cooler Minimum spacing in the gap is not more than the minimum spacing in the gap formed between the storage compartment side surface of the surface of the cooling chamber side and the cooler of the barrier walls.

As described above, according to the present invention, the airflow direction plate is inclined, and the distance of the gap formed between the cool air return port and the cooler is set to be equal to or less than the distance of the gap between the blocking wall and the cooler. Thus, it is possible to realize a refrigerator with a larger capacity while ensuring the cooling quality.

It is a front view of the refrigerator which concerns on Embodiment 1 of this invention. FIG. 2 is an internal structure diagram of the refrigerator when the line segment AA shown in FIG. 1 is viewed from the arrow direction. It is a principal part enlarged view which shows a part of structure of the cooling chamber enclosed with the dotted line B shown in FIG. FIG. 4 is a structural diagram around the freezer compartment return port when the line segment CC shown in FIG. 3 is viewed from the direction of the arrow. FIG. 4 is a structural diagram around the freezer compartment return port when the line segment DD shown in FIG. 3 is viewed from the direction of the arrow. It is a front view which shows an example of a structure of the cooler of FIG. 2, a ventilation fan, and a precooler. It is the schematic for demonstrating an example of the flow of the defrost water at the time of defrosting in the refrigerator of FIG. It is the schematic for demonstrating the other example of the flow of the defrost water at the time of defrosting in the refrigerator of FIG. It is the schematic which shows the measurement position of the temperature in the cooler of FIG. It is a graph which shows the measurement result of the temperature of each measurement position of Drawing 9 with and without the heat conduction wall.

Hereinafter, the refrigerator of the present invention will be described. Note that in the drawings used for the following description, the size relationship for each component may be different from the actual one. Moreover, the form of the component represented to the whole specification is an illustration to the last, Comprising: It is not limited to these description.

Embodiment 1 FIG.
FIG. 1 is a front view of a refrigerator 1 according to Embodiment 1 of the present invention. FIG. 2 is an internal structural view of the refrigerator 1 when the line segment AA shown in FIG. 1 is viewed from the arrow direction. FIG. 3 is an enlarged view of a main part showing a part of the structure of the cooling chamber 10 surrounded by a dotted line B shown in FIG.

[Composition of refrigerator]
As shown in FIG. 1, the refrigerator 1 includes a housing 1 </ b> A that forms an outer shell. The housing 1A is formed in a rectangular parallelepiped shape, for example. In the housing 1A, storage rooms such as a refrigerator room 2, an ice making room 3, a switching room 4, a freezing room 5, a vegetable room 6 and the like are provided, and doors are provided corresponding to the respective storage rooms. . In addition, in this example, the door of the refrigerator compartment 2 is a double-opening type configured with two doors, but is not limited thereto, and may be a single-opening type configured with one door, for example.

Further, on the door surface provided corresponding to the refrigerator compartment 2, an operation panel 7 for setting the temperature of each storage room and displaying the state of each storage room is provided. The operation panel 7 is not limited to the door surface, and may be provided in the refrigerator 1 such as a side surface of the refrigerator compartment 2, for example.

The refrigerator compartment 2 is a space provided with an open / close door as a door, and is arranged at the top. The ice making chamber 3 is a space provided with a drawer door as a door, and is arranged below the refrigerator compartment 2. The switching chamber 4 is a space provided with a drawer door as a door, and is arranged in parallel with the ice making chamber 3. The switching chamber 4 has a cold storage temperature ranging from a freezing temperature zone (eg, about −18 ° C.) to a refrigeration (eg, about 3 ° C.), chilled (eg, about 0 ° C.), soft freezing (eg, about −7 ° C.) The band can be switched. The freezer compartment 5 is a space provided with a drawer door as a door, and is disposed below the ice making chamber 3 and the switching chamber 4. The vegetable compartment 6 is a space provided with a drawer door as a door, and is arranged at the bottom.
In addition, the refrigerator 1 is not limited to the structure mentioned above. For example, the ice making chamber 3 and the switching chamber 4 may be omitted. Further, for example, the positions of the freezer compartment 5 and the vegetable compartment 6 may be reversed.

The refrigerator compartment 2 is provided with one or a plurality of refrigerator compartment storage cases 2A and one or a plurality of refrigerator compartment storage shelves 2B for storing food. The refrigerated chamber 2 is provided with a chilled chamber 2C and is provided with one or a plurality of chilled chamber storage cases 2D for storing food.
The ice making chamber 3 is provided with one or a plurality of ice making chamber storage cases 3A for storing food. The freezer compartment 5 is provided with one or a plurality of freezer compartment storage cases 5A for storing food. The vegetable compartment 6 is provided with one or a plurality of vegetable compartment storage cases 6A for storing food. Although not shown, the switching chamber 4 is also provided with a switching chamber storage case for storing food.

Each storage room of the refrigerator compartment 2, the ice making room 3, the switching room 4, the freezing room 5, and the vegetable room 6 is partitioned by a heat insulating partition wall 8 that blocks heat transfer between adjacent storage rooms.

A machine room 9 is provided at the lower back side of the housing 1A. The machine room 9 stores a compressor (not shown). The compressor discharges the sucked refrigerant at high temperature and high pressure.

Further, a thermistor and a control device (not shown) are provided inside the housing 1A.
The thermistor is provided in each storage room and detects the temperature of each storage room.
The control device controls the entire refrigerator 1. For example, based on the temperature detected by the thermistor, the control device controls the capacity of the compressor, the amount of air blown from a blower fan 12 to be described later, and the like so that the temperature in each storage chamber becomes a preset temperature. The control means includes, for example, hardware such as a circuit device that realizes this function, software that is executed on an arithmetic device such as a microcomputer or a CPU (Central Processing Unit).

A cooling chamber 10 that generates and sends out cool air for cooling the respective storage chambers is provided inside the housing 1A on the back side.

[Cooling chamber structure]
Next, the structure of the cooling chamber 10 will be described.
As shown in FIG. 3, the cooling chamber 10 is provided with a cooler 11, a blower fan 12 (see FIG. 2), a precooler 13, and a heater 14. In addition, a blocking wall 20 for partitioning the cooling chamber 10 and each storage chamber is provided between the cooling chamber 10 and each storage chamber (particularly, the freezing chamber 5), that is, on the front side of the cooling chamber 10, in the entire lateral direction. Is provided.

The cooler 11 is a heat exchanger that cools the air in the refrigerator 1. Although details will be described later, the cooler 11 performs heat exchange between the refrigerant flowing through the refrigerant pipe and the air to cool the air. In this example, the air in the refrigerator 1 flows from the lower side of the cooler 11 upward.
The blower fan 12 is provided above the cooler 11 and sends air cooled by the cooler 11 (hereinafter, appropriately referred to as “cold air”) to each storage room.

The pre-cooler 13 is provided below the cooler 11, and, like the cooler 11, performs heat exchange between the refrigerant flowing through the refrigerant pipe and the air. Details of the precooler 13 will be described later.
The heater 14 is provided below the cooler 11. The heater 14 is, for example, a radiant heater, and is provided for melting frost attached to the cooler 11 and the barrier wall 20 on the cooler 11 side.
A heater roof 14 </ b> A is provided on the upper surface of the heater 14. The heater roof 14A is for protecting the heater 14 from the defrost water dripped by removing frost.

A clearance X, which is a gap, is provided between the surface of the cooler 11 on the freezer compartment 5 side and the surface of the blocking wall 20 on the cooling chamber 10 side, thereby forming a bypass air passage 30. The bypass air passage 30 is in a state in which the air flow flows so as to bypass the cooler 11, but the bypass air flow is converged to the cooler 11 side above the cooler 11. Yes.
By providing the bypass air passage 30 in this manner, frost formation proceeds from below the cooler 11 as the air is cooled, and even if the lower portion of the cooler 11 is blocked by frost formation, the air is bypassed air passage 30. , The coolable time of the cooler 11 can be extended.

Below the cooling chamber 10, a drip tray 21 and a drain groove 22 are provided.
The drip tray 21 is provided at a position where defrosted water generated by melting of the frost by the heat of the heater 14 at the time of defrosting is dropped. The drain groove 22 is for discharging the defrost water dripped onto the drip tray 21 to the outside.

A freezing chamber return port 23 and a vegetable chamber return port 24 as cold air return ports are formed below the blocking wall 20 on the front side of the cooling chamber 10.
The freezer compartment return port 23 has a first opening surface 23 a that opens to the cooling chamber 10 and a second opening surface 23 b that opens to the freezer chamber 5, and is disposed between the cooling chamber 10 and the freezer chamber 5. Is provided so as to allow the return air from the freezing chamber 5 to flow into the cooling chamber 10.
Here, the “first opening surface 23a” refers to a boundary line between the cooling wall 10 side surface of the blocking wall 20 at the upper end of the freezing chamber return port 23 and the blocking wall 20 at the lower end of the opening. The surface formed when connecting the boundary line with the surface at the side of the cooling chamber 10 in a plane. In addition, the “second opening surface 23 b” refers to a boundary line between a freezing chamber 5 side surface of the blocking wall 20 at the upper end of the freezer return port 23 and a freezing chamber of the blocking wall 20 at the lower end of the frontage. A surface formed when a boundary line with the surface on the 5th side is connected by a plane.
The freezer compartment return port 23 is provided so that the lower end of the front end thereof is substantially the same as or lower than the lower end of the cooler 11. Thereby, the heat exchange in the cooler 11 can be performed efficiently.

Moreover, since the freezer compartment return port 23 is provided on the extension below the blocking wall 20, the first opening surface 23 a of the freezer compartment return port 23 and the surface of the cooler 11 on the freezer compartment 5 side are provided. The clearance Y, which is a gap between them, is a clearance substantially equal to or less than the clearance X in the bypass air passage 30 described above. At this time, when the minimum interval in the clearance Y is equal to or less than the minimum interval in the clearance X in the bypass air passage 30, the space in the refrigerator 1 can be used more effectively, and the capacity of the refrigerator 1 is increased. can do.

The vegetable room return port 24 is provided below the freezer room return port 23, has an opening surface that opens to each of the cooling room 10 and the vegetable room 6, and communicates between the cooling room 10 and the vegetable room 6. It is provided to do. The vegetable room return port 24 is for allowing the return air from the vegetable room 6 to flow into the cooling room 10.
Thus, by changing the arrangement positions of the freezer compartment return port 23 and the vegetable compartment return port 24, the return air from the freezer compartment 5 and the return air from the vegetable compartment 6 flow into the cooling chamber 10. Confluence can be suppressed.
In addition, by providing the vegetable room return port 24 below the freezer room return port 23, the return air from the vegetable room 6 containing a large amount of moisture is caused to flow into the vicinity of the precooler 13. Therefore, dehumidification of the return air can be sufficiently performed by the pre-cooler 13, and frosting of the cooler 11 can be suppressed to suppress a decrease in cooling capacity. Thereby, the fin pitch of the cooler 11 can be reduced, and the cooling performance in the cooler 11 can be improved.

A plurality of wind direction plates 25 for efficiently allowing the return air from the freezing chamber 5 to flow into the cooling chamber 10 are formed in the freezing chamber return port 23 provided in the blocking wall 20. Each of the airflow direction plates 25 is formed in a flat plate shape, and is inclined so as to be inclined downward with respect to the horizontal direction from the freezer compartment 5 side toward the cooler 11 side.

In addition, by providing a plurality of wind direction plates 25 in the freezer compartment return port 23, the cooler 11, the heater 14 and the like in the cooling chamber 10 can be shielded from light, and visibility from the outside can be improved.
Further, by providing a plurality of wind direction plates 25 at the freezer return port 23, it is possible to block radiant heat from the heater 14 and the pipe heater 17 which will be described later when defrosting, and to suppress the intrusion of heat into the freezer room 5. The energy saving property of the refrigerator 1 can be further improved.

4 is a structural diagram around the freezer compartment return port 23 when the line segment CC shown in FIG. 3 is viewed from the direction of the arrow.
As shown in FIG. 4A, the width extending in the side surface direction when viewed from the back side of the freezer return port 23 is equal to or less than a range in which heat generated by the heater 14 can be transmitted, that is, an effective heat generation range of the heater 14. Set to: This is to ensure that frost can be removed by defrosting when frost is generated at the freezer return port 23.

Further, as shown in FIG. 4B, the freezer return port 23 is provided with a heat conduction wall 26 between the wind direction plate 25 of the freezer return port 23 and the cooler 11. For example, the heat conducting wall 26 is provided in the vicinity of the central portion in the side surface direction of the freezer compartment return port 23. The heat conductive wall 26 is formed of a member in which a member having thermal conductivity such as an aluminum tape is attached to the surface on the cooler 11 side.

Thus, by sticking aluminum tape or the like on the surface of the heat conducting wall 26 on the side of the cooler 11, the heat of the heater 14 at the time of defrosting can be transmitted to the freezer return port 23 and the entire cooler 11. . Therefore, the frost in the freezer return port 23 and the cooler 11 can be removed without residual frost.

The width in the side surface direction of the heat conducting wall 26 is preferably about 30 mm to 100 mm, for example. For example, when the aluminum tape or the like is applied to the entire surface of the heat conducting wall 26 on the cooler 11 side, the width of the heat conducting wall 26 is substantially equal to the width of the aluminum tape that can be easily obtained commercially. This is because manufacturing costs such as material costs and pasting costs can be suppressed.

Note that the heat conducting wall 26 is not limited to the position shown in FIG. For example, as shown in FIG. 4C, a plurality of heat conducting walls 26 may be arranged at regular intervals with respect to the side surface direction of the freezer compartment return port 23.

FIG. 5 is a structural diagram around the freezer compartment return port 23 when the line segment DD shown in FIG. 3 is viewed from the direction of the arrow.
As shown in FIG. 5, a rib-like inclined portion 27 protruding toward the freezer compartment 5 is formed on the wall provided between the freezer compartment 5 and the cooling chamber 10 below the freezer compartment return port 23. Yes.
The inclined portion 27 is formed by connecting one flat plate formed in a valley shape downward or a plurality of flat plates formed in this way.

Further, a drainage hole 28 for guiding the defrost water to the drip tray 21 is provided at the valley-shaped apex in the inclined portion 27. By making the inclined portion 27 and the drainage hole 28 into such a shape, the defrost water that has entered the freezer compartment 5 during defrosting and dropped onto the inclined portion 27 flows toward the drainage hole 28, and enters the drip tray 21. It has come to be guided.

[Structure of cooler, blower fan and precooler]
6 is a front view showing an example of the configuration of the cooler 11, the blower fan 12, and the precooler 13 of FIG.
As shown in FIG. 6, the cooler 11 has a refrigerant pipe 15 and fins 16.
The cooler 11 exchanges heat between the air passing between the plurality of fins 16 and the refrigerant flowing through the refrigerant pipe 15.
The fins 16 are stacked at a predetermined interval (hereinafter referred to as “fin pitch” as appropriate), and air flows between them. An opening for inserting the refrigerant pipe 15 is formed in the fin 16. The refrigerant pipe 15 is inserted into the opening and joined to the refrigerant pipe 15.

The fin pitch of the fins 16 is determined in consideration of preventing an increase in air path resistance due to clogging between the fins 16 due to frost formation on the cooler 11. In order to prevent such clogging, the fin pitch is set in a range of about 5 mm to 10 mm, for example.
Further, frost formation on the cooler 11 occurs more on the upstream side than on the downstream side of the air flow. This is because heat exchange is performed with the cooler 11 as the air moves downstream, and the amount of moisture in the air decreases.
Therefore, in the cooler 11, the fin pitch on the upstream side of the air flow is set wider than that on the downstream side. Specifically, for example, the downstream fin pitch of the fins 16 is preferably set to 5 mm, and the upstream fin pitch is preferably set to about 7.5 mm to 10 mm.

Note that the fin pitch of the fins 16 is not limited to the above-described value as long as it does not depart from the spirit of the present invention, and can be appropriately changed.
Further, the shape of the fin 16 is not particularly limited, and for example, a plate fin, a corrugated fin, a louver fin, a slit fin, or the like can be applied.

Further, as a countermeasure against clogging between the fins 16 due to frost formation on the cooler 11, a pre-cooler 13 is provided on the upstream side of the air flow of the cooler 11. Similar to the cooler 11, the precooler 13 has a refrigerant pipe 15 and fins 16. The fins 16 of the precooler 13 are stacked at a predetermined fin pitch.

Since the pre-cooler 13 is arranged on the upstream side of the air flow of the cooler 11, more frost is generated than the cooler 11. Therefore, the fin pitch of the fins 16 in the pre-cooler 13 is set wider than the fin pitch in the cooler 11, for example, in a range of about 10 mm to 15 mm.

The fin pitch of the fins 16 in the precooler 13 is not particularly limited as long as it does not depart from the spirit of the present invention, and can be changed as appropriate.
The shape of the fin 16 is not particularly limited as in the case of the cooler 11, and for example, a plate fin, a corrugated fin, a louver fin, a slit fin, or the like can be applied.

The cooler 11 and the precooler 13 are provided with a pipe heater 17.
The pipe heater 17 is provided so as to be incorporated between the fins 16 of the cooler 11 and the precooler 13, and removes frost attached to the cooler 11 and the precooler 13. The pipe heater 17 can directly heat the cooler 11 and the precooler 13 by heat conduction, and can efficiently remove frost in a short time.

[Air flow in the refrigerator]
Next, the air flow in the refrigerator 1 according to the first embodiment will be described.
First, when the blower fan 12 is rotated, the cool air from the cooler 11 is sent to each storage room to cool each storage room.
The air flowing into the refrigerator compartment 2 circulates in the refrigerator compartment 2 to cool the refrigerator compartment 2 and flows into the vegetable compartment 6 through an air passage (not shown) provided on the back side of the refrigerator 1.
The air flowing into the vegetable compartment 6 circulates in the vegetable compartment 6 to cool the vegetable compartment 6. The return air from the vegetable compartment 6 flows into the cooling chamber 10 from the vegetable compartment return port 24.
The air that has flowed into the freezer compartment 5 circulates within the freezer compartment 5 to cool the inside of the freezer compartment 5. Then, the return air from the freezer compartment 5 flows into the cooling chamber 10 from the freezer compartment return port 23.
Similarly, the air that has flowed into the respective storage chambers such as the ice making chamber 3 and the switching chamber 4 cools the respective storage chambers, and the return air from each of the storage chambers flows into the cooling chamber 10 from a return port (not shown). .

[Flow of defrost water]
Next, the flow of defrost water generated at the time of defrosting will be described.
FIG. 7 is a schematic diagram for explaining an example of the flow of the defrost water 40 at the time of defrosting in the refrigerator 1 of FIG. FIG. 8 is a schematic view for explaining another example of the flow of the defrost water 40 at the time of defrosting in the refrigerator 1 of FIG.

As shown in FIG. 7, the frost adhering to the cooler 11 drops as defrost water 40 when defrosting and passes through the clearance Y between the freezer return port 23 and the cooler 11. And after defrosting water 40 is dripped on the drip tray 21, it is discharged | emitted outside via the drainage groove 22. FIG.

Here, when the defrost water 40 passes through the clearance Y between the freezer return port 23 and the cooler 11, it may be dripped onto the wind direction plate 25. Thus, if the defrost water 40 dripped on the wind direction plate 25 remains on the wind direction plate 25 as it is, there is a possibility that the defrost water 40 becomes frost again and closes the freezer compartment return port 23.

However, the wind direction plate 25 according to the first embodiment is formed so as to be inclined downward with respect to the horizontal direction from the freezer compartment 5 side toward the cooler 11 side. Therefore, the defrost water 40 dripped on the wind direction plate 25 is returned to the clearance Y between the freezer return port 23 and the cooler 11 by the inclination of the wind direction plate 25.

Thus, by providing the wind direction plate 25 inclined downward from the freezer compartment 5 side toward the cooler 11 side, the defrost water 40 generated at the time of defrosting is kept on the wind direction plate 25. It is possible to guide it to the drip tray 21 without making it. Therefore, blockage of the freezer compartment return port 23 due to frost caused by the defrosted water 40 remaining on the wind direction plate 25 can be prevented.

On the other hand, it is conceivable that the defrosted water 40 dripped on the wind direction plate 25 enters the freezer compartment 5 beyond the wind direction plate 25. When the defrost water 40 enters the freezer compartment 5 in this manner, frost and dew in the freezer compartment 5 may occur.

However, in the first embodiment, an inclined portion 27 protruding toward the freezer compartment 5 is provided on the wall below the freezer compartment return port 23. Therefore, as shown in FIG. 8, the defrost water 40 that has entered the freezer compartment 5 is guided to the drain hole 28 provided at the apex on the lower side along the inclined portion 27. Then, the defrost water 40 guided to the drain hole 28 is drained into the cooling chamber 10 through the drain hole 28, dropped onto the drip tray 21, and then discharged to the outside through the drain groove 22.

In this way, by providing the inclined portion 27 and the drainage hole 28 protruding to the freezer compartment 5 side in the wall below the freezer compartment return port 23, even if the defrost water 40 enters the freezer compartment 5, it can be removed. The frost water 40 can be discharged into the cooling chamber 10. Therefore, it is possible to prevent frost and dew in the freezer compartment 5 due to the defrosted water 40 that has entered the freezer compartment 5.

[Effects of heat conduction wall]
Next, the effect obtained by providing the heat conduction wall 26 between the freezer return port 23 and the cooler 11 will be described.

FIG. 9 is a schematic diagram showing a temperature measurement position in the cooler 11 of FIG. FIG. 10 is a graph showing the measurement results of the temperature at each measurement position in FIG.
In this example, as shown in FIG. 9, first, the cooler 11 is divided into nine in the vertical and horizontal directions. Next, a circle which is each divided portion when the heat conduction wall 26 having a width of about 100 mm is provided near the center of the cooler 11 and when it is not provided between the freezer return port 23 and the cooler 11. For the portions a to i shown, the surface temperature of the fin 16 in the cooler 11 during defrosting was measured. And based on these measurement results, the average temperature of each of the upper part, the center part, and the lower part of the fin 16 was calculated, and the effectiveness of the heat conduction wall 26 was verified.

The symbol a indicates the position of the upper left side of the fin 16. The symbol b indicates the position of the upper center of the fin 16. Reference symbol c indicates a position on the upper right side of the fin 16.
The symbol d indicates the position on the left side of the central portion of the fin 16. The symbol e indicates the position of the center of the center of the fin 16. The symbol f indicates the position on the right side of the center portion of the fin 16.
A symbol g indicates a position on the lower left side of the fin 16. The symbol h indicates the position of the lower center of the fin 16. The symbol i indicates the position on the lower right side of the fin 16.

As a result of the verification, as shown in FIG. 10, the temperature when the heat conduction wall 26 was provided increased in all of the upper part, the center part, and the lower part of the fin 16 as compared with the case where the heat conduction wall 26 was not provided.
Thereby, by providing the heat conductive wall 26, it turns out that the heat at the time of defrosting can be efficiently spread over the cooler 11 whole.

As described above, in the first embodiment, the wind direction plate 25 that is inclined downward from the freezer compartment 5 side toward the cooler 11 side is provided in the freezer compartment return port 23. Therefore, it is possible to prevent the defrost water 40 from staying on the wind direction plate 25. And obstruction | occlusion of the freezer compartment return port 23 by the frost resulting from the defrost water 40 which stayed on the wind direction board 25 can be prevented.

In addition, such a wind direction plate 25 is provided, and a bypass air passage formed between the cooler 11 and the blocking wall 20 has a minimum distance in the clearance Y between the freezer return port 23 and the cooler 11. It was made into below the minimum space | interval in the clearance X of 30. Therefore, the space in the refrigerator 1 can be used effectively, and a larger capacity can be realized.

Furthermore, since the inclined part 27 which protrudes in the freezer compartment 5 side and the drainage hole 28 were provided in the vertex of the lower part side of the inclined part 27 in the wall below the freezer compartment return port 23, the defrost water which infiltrated the freezer room 5 was provided. 40 can be discharged into the cooling chamber 10. And the frost and dew in the freezer compartment 5 resulting from the defrost water 40 which penetrate | invaded the freezer compartment 5 can be prevented.

Furthermore, since the heat conduction wall 26 to which a member having thermal conductivity is attached is provided between the freezer return port 23 and the cooler 11, heat at the time of defrosting is efficiently spread over the entire cooler 11. be able to.

1 Refrigerator, 1A enclosure, 2 cold storage room, 2A cold storage room storage case, 2B cold storage room storage shelf, 2C chilled room, 2D chilled room storage case, 3 ice making room, 3A ice making room storage case, 4 switching room, 5 freezing room 5A freezer storage case, 6 vegetable room, 6A vegetable room storage case, 7 operation panel, 8 heat insulation partition wall, 9 machine room, 10 cooling room, 11 cooler, 12 blower fan, 13 precooler, 14 heater, 14A heater roof, 15 refrigerant piping, 16 fins, 17 pipe heater, 20 barrier wall, 21 drip tray, 22 drainage groove, 23 freezer return port, 23a first opening surface, 23b second opening surface, 24 vegetable room return Mouth, 25 wind direction plate, 26 heat conduction wall, 27 inclined part, 28 drainage hole, 30 bypass air passage, 40 defrost water.

Claims

A storage room for at least one of freezing and refrigeration of food;
A cooling chamber that is provided on the back side of the storage chamber and that contains a cooler that generates cool air that cools the storage chamber, and a heater that is provided below the cooler and that melts frost adhering to the cooler When,
A blocking wall that partitions the storage chamber and the cooling chamber from each other;
The barrier wall includes
A first opening surface that opens to the cooling chamber side and a second opening surface that opens to the storage chamber side communicate with the storage chamber and the cooling chamber, and return air from the storage chamber A cold air return port to flow into the cooling chamber;
A wind direction plate provided at the cold air return port and inclined downward from the storage chamber side toward the cooler side;
The minimum gap in the gap formed between the first opening surface of the cold air return port and the storage chamber side surface of the cooler is the cooling chamber side surface of the blocking wall and the cooler. The refrigerator which is below the minimum space | interval in the clearance gap formed between the said storage chamber side surfaces.
2. The refrigerator according to claim 1, wherein an inclined portion having a valley shape is formed below the cold air return port in the blocking wall and protrudes downward toward the storage chamber side.
The refrigerator according to claim 1, wherein a heat conduction wall is provided between the cold air return port and the cooler to transfer heat from the heater to the cooler.
The refrigerator according to claim 3, wherein the heat conducting wall is provided with a member having heat conductivity on a surface on the cooler side.
The refrigerator according to any one of claims 1 to 4, wherein the cold air return port has a width in a side surface direction that is equal to or less than an effective heat generation range in which heat from the heater is transmitted.
The refrigerator according to any one of claims 1 to 5, wherein a lower end of the cold air return port is located above a lower end of the cooler.
The storage room is
Including at least a freezer compartment,
The cold air return port is
The refrigerator according to any one of claims 1 to 6, wherein the refrigerator is a freezing room return port through which return air from the freezing room flows into the cooling room.