JP2015161450A - refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that hardly disturbs a flow of return air even if a liquid is spilled in a refrigeration room and can suppress a decrease in cooling efficiency.SOLUTION: There is provided a refrigerator Rf that includes a heat insulation wall part 4 which partitions an internal space into two spaces as an upper-stage freezing room R1 and a lower-stage refrigerating room R2; a cooler storage room R3 provided on an inner side of the freezing room R1; and a freezing return duct 44 formed at the heat insulation wall part, the freezing return duct 44 having an inflow port 441, opened on an upper surface of the heat insulation wall part 4, at a front-side end part such that at least a lower part of the inflow port of a bottom surface of the freezing return duct 44 is inclined downward toward the inner side.

Description

  The present invention relates to a refrigerator for storing articles at a low temperature.

  The refrigerator has a heat insulating wall that divides the internal space into a freezing room for freezing and storing articles to be stored and a refrigerating room for storing goods at a temperature lower than the outside temperature without freezing the goods. . Among the refrigerators, there is a so-called top freezer type refrigerator having the freezer compartment on the upper stage and the refrigerator compartment on the lower stage. In the top freezer type refrigerator, the bottom surface portion (floor surface portion) of the freezer compartment and the upper surface portion (top surface portion) of the refrigerator compartment are constituted by heat insulating walls.

  In the cooler, air is forcibly circulated by forcibly circulating air at temperatures corresponding to the freezer compartment and the refrigerator compartment using a blower (fan or the like). In order to circulate the air, the refrigerator has a refrigeration return duct for returning air (return air) circulated in the freezer compartment to the evaporator in the heat insulating wall, and air circulated in the cooler chamber. A refrigerated return duct for returning (return air) to the evaporator is provided (see, for example, JP 2012-237520 A).

  For example, in the refrigeration return duct, the inlet is provided on the near side of the bottom surface of the freezer compartment and opens upward (freezer compartment). And since the said refrigeration return duct has the restriction | limiting of the thickness of a heat insulation wall and is forced to circulate air, it is the structure which bends the flow direction of return air in the vicinity of the said inflow port. . The refrigeration return duct has the same configuration, and the refrigeration return duct and the refrigeration return duct are provided on the heat insulating wall, so that useless space can be eliminated and the freezing room and the refrigeration room are widened. It is possible.

JP2012-237520A

  When the liquid such as water or beverage is frozen in the freezer, the liquid is put in a freezing container and the whole container is put in the freezer and frozen. In a top freezer type refrigerator, when the liquid in the container spills into the freezer compartment, it may flow into the refrigeration return duct. A drainage unit for removing drain water is provided at the lower part of the evaporator, but it is difficult to push away the inflowing liquid with the air flowing through the refrigeration return duct, and the inflowing liquid accumulates in the vicinity of the inlet. .

  And since the air of the said freezer compartment flows in into the said freezing return duct, the liquid which flowed in into the said freezing return duct freezes in the vicinity of the inflow port of the said freezing return duct. When the liquid that flows in near the inlet of the refrigeration return duct freezes, the cross-sectional area near the inlet of the refrigeration return duct becomes narrower, and the flow path resistance increases. The refrigeration return duct has a large flow resistance in the vicinity of the inflow port due to its structure (structure for changing the flow direction), and the liquid freezes at that portion, so that the flow resistance is further increased, and the return air returns poorly. That is, the cooling efficiency of the freezer compartment decreases.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a refrigerator that can hardly disturb the flow of return air even when liquid is spilled into the freezer compartment, and can suppress a decrease in cooling efficiency.

  In order to achieve the above object, the present invention is a refrigerator for storing articles at low temperature, a heat insulating wall section that divides an internal space into two spaces of an upper freezer compartment and a lower refrigerator compartment, A cooler storage chamber that is provided on the back side and that stores a cooler, and a freezer that is formed in the heat insulating wall and extends from the near side to the back side to cool the freezing chamber and returns the air to the cooler storage chamber. A return duct, and the refrigeration return duct has an inlet opening at an upper end of the heat insulating wall at an end on the near side, and at least a lower part of the inlet on the bottom surface of the refrigeration return duct is on the back side. It is characterized by inclining so as to be lowered.

  By comprising in this way, when liquids, such as water, have flowed into the said refrigeration return duct, it can suppress that a liquid freezes in the vicinity of an inflow port. Thereby, it is possible to prevent the liquid from freezing near the inlet where the flow resistance of the return air is large and the flow of the return air from deteriorating. Moreover, since water does not collect in the inflow port which is easy to be noticed by the user, it is difficult to visually recognize the freezing of the liquid in the refrigeration return duct, and the user is less likely to feel uneasy.

  In the above configuration, the lower part of the inlet of the refrigeration return duct is centered on the end of the inlet on the cooler storage chamber side, and the length in the depth direction of the refrigeration return duct of the inlet is a radius. You may have the curved surface part of a cutting circular pipe shape.

  The said structure WHEREIN: The lower part of the said inflow port of the said refrigeration return duct may have the plane inclination part formed in planar shape.

  In the above-described configuration, a plurality of fins are arranged in the depth direction at the inflow port, and among the plurality of fins, a lower end of the innermost fin and a fin immediately before the innermost fin The bottom surface of the refrigeration return duct is the farthest fin when the portion where the surface connecting the upper end of the refrigeration and the bottom surface of the refrigeration return duct intersects from the end in the depth direction of the inlet. May be inclined to a portion where a surface connecting the lower end of the refrigeration and the upper end of the fin immediately before the innermost fin intersects the bottom of the refrigeration return duct.

  According to this configuration, since the liquid can flow to the back of the area that reaches directly to the bottom of the refrigeration return duct among the return air that flows in from the inlet, the liquid in the portion where the resistance of the return air is large in the refrigeration return duct. Freezing can be suppressed. Thereby, the raise of the flow resistance of return air can be suppressed. In addition, since the liquid can flow in an area that the user cannot visually recognize, the frozen liquid is not visually recognized by the user, and the user is less likely to feel anxiety.

  The said structure WHEREIN: The whole bottom face of the said refrigeration return duct may incline toward the back | inner side. According to this configuration, even if a large amount of liquid flows into the refrigeration return duct, the liquid can flow into the cooler storage chamber, and the refrigeration return duct can be prevented from being filled with the frozen liquid.

  ADVANTAGE OF THE INVENTION According to this invention, even when a liquid is spilled in a freezer compartment, it is hard to obstruct the flow of return air, and the refrigerator which can suppress the fall of cooling efficiency can be provided.

It is a sectional side view of an example of the refrigerator concerning this invention. It is a schematic piping diagram of a cooling device. It is a top view of the heat insulation wall used for the refrigerator concerning this invention. It is sectional drawing which cut | disconnected the heat insulation wall shown in FIG. 3 by the IV-IV line. It is sectional drawing which cut | disconnected the heat insulation wall shown in FIG. 3 by the VV line. It is sectional drawing to which the vicinity of the inflow port of the refrigeration return duct of a heat insulation wall was expanded. It is sectional drawing to which the vicinity of the inflow port of the refrigeration return duct of a heat insulation wall was expanded. It is sectional drawing to which the vicinity of the inflow port of the refrigeration return duct of a heat insulation wall was expanded. It is sectional drawing to which the vicinity of the inflow port of the refrigeration return duct of a heat insulation wall was expanded. It is sectional drawing to which the vicinity of the inflow port of the refrigeration return duct of a heat insulation wall was expanded.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view of an example of a refrigerator. As shown in FIG. 1, the refrigerator Rf includes a housing 1 whose front is open and doors 21 and 22 attached to the front of the housing 1 so as to be opened and closed. And a cooling device 3. The housing 1 includes a concave internal space that is open on the front side, and includes a heat insulating wall 4 that partitions the internal space into an upper space and a lower space. The door 21 is a door corresponding to the upper space, and the door 22 is a door corresponding to the lower space.

  In the refrigerator Rf, the upper space is a freezer compartment R1 for storing articles in a frozen state, and the lower space is a refrigerator compartment R2 for storing articles at a lower temperature than the outside. The refrigerator Rf is a so-called top freezer type refrigerator.

  A heat insulator is disposed inside the housing 1. The heat insulator is a heat insulating member that suppresses heat transfer between the outside and the inside of the housing 1 and is also a strength member for maintaining the structural strength of the housing 1. In the refrigerator Rf, examples of the heat insulator include foamed polyurethane, foamed polystyrene resin, foamed phenol resin, foamed urea resin, and the like. The heat insulator can be formed by forming the wall of the housing 1 in a hollow shape, injecting a stock solution of foam heat insulating material into the hollow portion, and filling the inside of the space with foam. Although details are omitted, the door 21 and the door 22 also have a structure in which a heat insulator is disposed in a hollow portion.

  And the heat insulation wall part 4 which partitions off the internal space of the housing | casing 1 into freezer compartment R1 and refrigerator compartment R2 also becomes a structure containing the heat insulating body similar to the housing | casing 1, the door 21, and the door 22. FIG. In addition, the inner wall is formed in the part which faces the freezer compartment R1 or refrigerator compartment R2 of the housing | casing 1, the door 21, the door 22, and the heat insulation wall part 4. As shown in FIG. Since this inner wall is a part that mainly serves as a wall surrounding a space for storing food and also a part that the user contacts, a material that is hygienic and that does not feel uncomfortable even if contacted, such as ABS, PP, It is made of a resin such as PS. The details of the heat insulating wall 4 will be described later.

  Next, details of the cooling device 3 will be described with reference to a new drawing. FIG. 2 is a schematic piping diagram of the cooling device. As shown in FIG. 2, the cooling device 3 includes a compressor 31, a condenser 32, a capillary tube 33, and an evaporator 34 (cooler). And the cooling device 3 is connected cyclically | annularly in this order, and comprises the refrigerating cycle by enclosing a refrigerant | coolant inside.

  The cooling device 3 will be further described. The cooling device 3 is a heat pump for taking out cold heat by changing the phase of the enclosed refrigerant between gas and liquid. In the cooling device 3, the refrigerant that is a gas is compressed by the compressor 31, and is sent to the condenser 32 in the state of a high-temperature and high-pressure gas refrigerant (gas). As shown in FIG. 1, the compressor 31 of the cooling device 3 is disposed inside a machine room 11 provided on the lower back surface of the refrigerator Rf.

  The condenser 32 is a device that releases the heat of the refrigerant to the outside of the refrigerator Rf (exchanges heat with the outside) and changes (condenses) the refrigerant flowing inside from a gas to a liquid. In a recent refrigerator, a refrigerant pipe is disposed near the outer surface of the housing 1, and a high-temperature and high-pressure refrigerant flows through the pipe, thereby performing heat exchange between the air outside the refrigerator and the refrigerant. The one equipped with (so-called wall condenser) is increasing. In addition, in order to sufficiently remove the heat of the refrigerant, the condenser 32 includes a fin-and-pipe heat exchanger including a plurality of fins arranged in parallel and a pipe penetrating the fins. Also good.

  The refrigerant condensed in the condenser 32 is sent to the capillary tube 33. The capillary tube 33 is a narrow tube that restricts the flow rate of the refrigerant. When the refrigerant flows out from the outlet of the capillary tube 33, it rapidly expands. At this time, the refrigerant is cooled and changed into a mist (atomization). The atomized refrigerant is in a liquid phase. Then, the low-temperature mist refrigerant is sent to the evaporator 34.

  The refrigerant is vaporized (evaporated) by the evaporator 34. When the refrigerant evaporates, it takes heat of vaporization from the surroundings. The surface of the evaporator 34 is cooled by the heat of vaporization. The cooling device 3 cools the internal space of the refrigerator Rf with cool air generated around the evaporator 34 (vaporization heat absorbed by the refrigerant flowing through the evaporator).

  In the cooling device 3, the condenser 32 is a device that releases heat to the outside, and the evaporator 34 is a device that cools the internal space. Further, the compressor 31 requires a device for supplying power. Therefore, as shown in FIG. 1, the compressor 31 is disposed inside the machine room 11. Moreover, since the evaporator 34 is a device that cools the internal space of the refrigerator Rf, the evaporator 34 is disposed in the back of the freezer compartment R1. The evaporator 34 has a low surface temperature and is dangerous when the operator's hand or article is in direct contact. Therefore, the evaporator 34 is arrange | positioned in the cooler storage chamber R3 provided in the back side of the inner wall of the back | inner side of freezer compartment R1.

  A blower 35 is disposed in the refrigerator Rf adjacent to the evaporator 34. By operating the blower 35, an airflow flowing on the surface of the evaporator 34 is generated. And when an airflow flows through the surface of the evaporator 34, heat exchange is performed between the airflow and the internal refrigerant, and the airflow becomes low-temperature air (cold air). Then, by sending this cold air into the freezer compartment R1, the freezer compartment R1 is cooled, that is, the articles stored inside the freezer compartment R1 are frozen.

  3 is a plan view of a heat insulating wall used in the refrigerator according to the present invention, FIG. 4 is a sectional view of the heat insulating wall shown in FIG. 3 cut along the line IV-IV, and FIG. 5 is a heat insulating wall shown in FIG. It is sectional drawing which cut | disconnected the wall by the VV line.

  As shown in FIGS. 3, 4, and 5, the heat insulating wall 4 covers the heat insulating body 40 with an upper surface cover 401 and a lower surface cover 402. The heat insulating wall 4 includes a drain water receiver 41, a ventilation duct 42, a refrigeration return duct 43, and a refrigeration return duct 44.

  As shown in FIG. 1 and the like, the drain water receiver 41 constitutes a part of the bottom surface of the cooler housing chamber R3 in which the evaporator 31 is disposed. The drain water receiver 41 receives drain water which is water generated by melting frost attached to the evaporator 34. The drain water receiver 41 includes a drain water drain portion 411, and the bottom surface of the drain water receiver portion 41 is inclined toward the drain water drain portion 411. By inclining in this way, the drain water that has flowed into the drain water receiving portion 41 flows toward the drain water drainage portion 411 and is discharged from the drain water drainage portion 411 to the outside of the refrigerator Rf. In addition, as a method for discharging drain water to the outside of the refrigerator Rf, for example, a method of evaporating using heat of the compressor 31 or the condenser 32 can be cited, but the method is not limited thereto.

  The ventilation duct 42 penetrates the heat insulating wall part 4 up and down, and in the refrigerator Rf, the cooler storage room R3 and the refrigerating room R2 are connected via the ventilation duct 42. Cold air can be sent to the refrigerating room R2 through the ventilation duct 42. Note that a damper (not shown) for blocking the air flow is attached to the ventilation duct 42 so as to be openable and closable, and is opened and closed as necessary (for example, according to the temperature of the refrigerator compartment R2). To control the flow.

  The refrigeration return duct 43 is a through hole formed inside the heat insulating wall portion 4 and includes a wind direction conversion portion 431 curved downward on the front side. Further, an inflow port 432 that opens toward the lower surface of the heat insulating wall portion 4 and into which return air flows is formed in the vicinity of the wind direction conversion portion 431. The back side of the refrigeration return duct 43 is connected to the cooler storage chamber R3. In addition, an inflow grid 433 is formed at a portion of the lower surface cover 402 that covers the inlet 432 so as to suppress the entry of articles stored in the refrigerator R2 and the user's hand (finger). The inflow lattice 433 has a shape that allows the return air to pass therethrough but suppresses the entry of an article or a user's hand (finger).

  The return air, which is the air circulated in the refrigerator compartment R2, flows into the inlet 432 at a predetermined angle. When the return air passes through the wind direction conversion section 431, the flow direction is converted so as to go to the back side of the refrigerator Rf. As a result, the return air flows along the refrigeration return duct 43 and flows into the cooler housing chamber R3. The wind direction conversion part 431 has a curved surface shape curved from the inflow port 432 to the back side. In addition, the shape of the wind direction conversion part 431 is not limited to this, The thing which can convert the wind direction of return air with little flow resistance can be employ | adopted widely.

  The refrigeration return duct 44 is provided on the upper surface of the heat insulator 40, and has a concave groove 440 extending from the front side of the refrigerator toward the back side, and a wind direction conversion unit 442 provided continuously at an end portion on the front side of the concave groove 440. have. And the upper part of the ditch | groove 440 is covered with the upper surface cover 401, and it suppresses that the articles | goods stored in refrigerator compartment R1 enter into the ditch | groove 440, ie, the freezing return duct 44. FIG. An inlet 441 through which return air circulated through the freezer compartment R1 flows is formed at the end on the near side of the refrigeration return duct 44, that is, at the upper part of the air direction conversion section 442. The inflow port 441 is a rectangular through-hole formed in the upper surface cover 401 and opens to the upper surface side of the heat insulating wall portion 4.

  The wind direction converter 442 has a curved bottom surface. Although the details of the shape of the wind direction conversion unit 442 will be described later, it is a shape that can convert the wind direction of the return air with a small flow resistance. The refrigeration return duct 44 includes an inflow lattice 443 for suppressing the entry of articles and the user's hand (finger) from the inlet 441 to the refrigeration return duct 44. In addition, although the inflow lattice 443 can mention what is integrally formed with the upper surface cover 401, it is not limited to this, For example, the thing of the structure which can be attached or detached may be used.

  As shown in FIG. 3, in the refrigerator Rf, the heat insulating wall portion 4 is provided with two refrigeration return ducts 44 on the left and right. By forming two refrigeration return ducts 44, the flow path of the cold air in the freezer compartment R1 is divided. Thereby, the cold air can be widely dispersed inside the freezer compartment R1, and temperature unevenness (partial temperature deviation) inside the refrigerator compartment R1 is suppressed.

  In the refrigerator Rf, the air blower 35 is operated to send out the cold air generated in the evaporator 34 into the freezer compartment R1. This cold air circulates in the freezer compartment R1, exchanges heat with the air and the stored items inside the freezer compartment R1, and then returns to the cooler housing chamber R3 via the freezing return duct 44 as return air. The return air is heat-exchanged with the air inside the freezer compartment R1 and the stored items, so that the temperature rises, but is sufficiently low-temperature air to cool the refrigerator compartment R2. The return air is sent to the refrigerating room R2 through the ventilation duct 42 as cooling room cooling air, and the refrigerating room R2 is cooled by circulating in the refrigerating room R2.

  As described above, the air duct 42 is provided with a damper that can be opened and closed. By opening and closing the damper, the inflow amount of the cooling room cooling air flowing into the refrigerating room R2 is adjusted, and the inside of the refrigerating room R2 is adjusted. The temperature is controlled.

(First embodiment)
The refrigeration return duct which is the principal part of the refrigerator according to the present invention will be described with reference to the drawings. FIG. 6 is an enlarged cross-sectional view of the vicinity of the inlet of the refrigeration return duct of the heat insulating wall. The inlet 441 of the refrigeration return duct 44 of the heat insulating wall 4 is a rectangular opening, and the length in the depth direction of the refrigerator Rf is the length D. Further, the depth (height) of the recessed groove 440 of the refrigeration return duct 44 is the depth H1, and the depth H1 and the length D of the inflow port 441 in the depth direction have the same dimensions.

  As shown in FIG. 6, the wind direction conversion portion 442 is formed in a region that reaches the end on the back side of the inflow port 441 from the end on the near side of the refrigeration return duct 44. The airflow direction conversion unit 442 has a shape in which the side of the inflow port 441 disposed on the back side of the rectangular refrigerator Rf is the central axis and the inflow port 441 is rotated by 90 °, that is, a cylinder is centered along the central axis. The shape is cut so that the angle is 90 °. More specifically, the bottom surface of the wind direction changing portion 442 is a curved surface that becomes a part of a circular tube having a radius D, and is smoothly connected to the bottom surface of the concave groove 440. By having such a curved surface shape, the bottom surface of the wind direction conversion unit 442 has a shape in which a tangent is inclined downward toward the back side.

  The return air flowing in from the inflow port 441 flows into the wind direction conversion unit 442. The return air collides with the curved bottom surface of the wind direction changing portion 442 and flows to the back side along the curved surface. At this time, since the return air flows along a curved surface (smooth surface), the flow resistance (pressure loss) when changing the flow direction of the return air is reduced. And the wind direction conversion part 442 has the same cross-sectional area cut | disconnected along the radius as the cross section of the inflow port 441, and can suppress the increase in flow path resistance (pressure loss) by the change of the area of a flow path.

  When a liquid such as water flows from the inflow port 441, the liquid flows into the wind direction conversion unit 442. Since the bottom surface of the wind direction conversion portion 442 is formed in a curved surface and has an inclination that goes down toward the back at all locations, the liquid flows to the concave groove 440 along the curved bottom surface. Thereby, it is possible to suppress the liquid from freezing at the bottom of the wind direction conversion unit 442 and to suppress further increase of the flow resistance in the wind direction conversion unit 442 having a higher flow resistance than the other part of the refrigeration return duct 44. It is.

  Note that the liquid flowing in from the inlet 441 stays in the concave groove 440 and freezes at that portion. Since the concave groove 440 is a linear concave portion, the flow resistance of the return air is hardly increased even if the inflowing liquid freezes on the bottom surface.

  The return air flowing through the refrigeration return duct 44 is a gas having a low temperature and a low humidity. Therefore, in the refrigeration return duct 44, the moisture contained in the return air is hardly frozen further on the frozen liquid. Further, the liquid frozen at the bottom surface of the concave groove 440 is sublimated by being exposed to return air. Therefore, although depending on the amount, even if the liquid that has flowed into the refrigeration return duct 44 is left as it is, the flow resistance of the refrigeration return duct 44 is unlikely to become excessively high or clogged. Further, since the liquid flowing in from the inlet 441 flows to the back side of the inlet 441 of the refrigeration duct 44 and freezes, it is difficult for the user to visually recognize it, and it is difficult for the user to feel distrust.

  In the present embodiment, the shape of the bottom surface of the airflow direction conversion unit 442 is described as having a circular tube-shaped curved surface, but is not limited to this, and the flow of the return air flowing in from the inlet 441 is not limited thereto. A shape that can change the flow direction to the back side while suppressing the resistance can be widely adopted.

(Second Embodiment)
Another example of the refrigeration return duct, which is a main part of the refrigerator according to the present invention, will be described with reference to the drawings. FIG. 7 is an enlarged cross-sectional view of the vicinity of the inlet of the refrigeration return duct of the heat insulating wall. The heat insulating wall shown in FIG. 7 has the same configuration as that of the heat insulating wall described in the first embodiment, except that the shape of the wind direction changing portion 45 of the refrigeration return duct 44b is different. Therefore, substantially the same parts are denoted by the same reference numerals.

  In the refrigeration return duct 44b, the depth of the concave groove 440 is the depth H2. The depth H2 is greater (deeper) than the length D of the inflow port 441 in the depth direction. When the depth H <b> 2 of the concave groove 440 is larger than the length D, an arcuate curved surface having a radius D with the inner side of the inflow port 441 as the central axis does not contact the bottom surface of the concave groove 440. Therefore, as shown in FIG. 7, the bottom surface of the airflow direction changing portion 45 of the refrigeration return duct 44 b has a curved surface portion 451 provided on the near side and a flat inclined portion 452 formed continuously with the back side of the curved surface portion 451. And.

  In the refrigeration return duct 44b, the curved surface portion 451 of the wind direction changing portion 45 is a curved surface having an arcuate cross section having a radius D with the back side of the inflow port 441 as an axis. The flat inclined portion 452 is a flat surface that is in smooth contact with the curved surface portion 451, and the flat inclined portion 452 is formed so as to be in smooth contact with the end portion on the near side of the bottom surface of the groove 440. That is, the flat inclined portion 452 has a front end smoothly connected to the curved surface portion 451 and a back end connected smoothly to the bottom surface of the groove 440. The plane inclined portion 452 is inclined by θ ° (inclined angle θ °) with respect to the bottom surface of the concave groove 440.

  Thus, even when the depth H2 of the groove 440 is larger than the length D in the depth direction of the cold inflow port 441, the wind direction conversion portion 45 includes the curved surface portion 451 and the flat inclined portion 452. The flow direction of the return air can be directed to the back by suppressing the flow resistance by the wind direction conversion unit 45. Further, since both the curved surface portion 451 and the plane inclined portion 452 are inclined so as to go downward toward the back, the liquid flowing into the refrigeration return duct 44b flows to the concave groove 440, and therefore, even if it has been frozen. It is possible to suppress an increase in flow resistance.

  The inclination angle θ ° of the plane inclined portion 452 is not particularly limited as long as it is an angle through which the liquid flows. The inventor of the present invention has obtained knowledge that the inclination angle θ ° may be 4 ° or more. Therefore, in the present invention, when the plane inclined portion 452 is a plane, the inclination angle θ ° is preferably 4 ° or more. Moreover, when the angle of inclination is too large, the heat insulation wall part 4 will become thick. Therefore, the inclination angle θ ° is preferably 10 ° or less.

  In the present embodiment, since the depth H2 of the concave groove 440 is larger than the length D of the inflow port 441 in the depth direction, the flat inclined portion 452 is a portion connected to the curved surface portion 451, and is tangent to the curved surface portion 451. It is also possible to form it so as to extend in the direction. By forming in this way, since the change of the connection part of the curved surface part 451 and the plane inclination part 452 decreases, the flow resistance of return air becomes small. In addition, the liquid that has flowed in easily flows to the back side. Further, in the present embodiment, the flat inclined portion 452 is a flat surface, but is not limited to this, and the entire surface may be formed in a curved shape, or connected to the curved surface portion 451 and the bottom surfaces of the concave grooves 440. Only the portions to be curved may be formed in a curved surface shape and smoothly connected to the respective portions.

  In the present embodiment, it is assumed for convenience, but is not limited to this. Even when the depth H2 and the length D are the same, the wind direction conversion unit 45 may be created so that the front side is the curved surface portion 451 and the back side is the flat inclined portion 452.

  Other features are the same as in the first embodiment.

(Third embodiment)
Another example of the refrigeration return duct, which is a main part of the refrigerator according to the present invention, will be described with reference to the drawings. FIG. 8 is an enlarged cross-sectional view of the vicinity of the inlet of the refrigeration return duct of the heat insulating wall. The heat insulating wall shown in FIG. 8 has the same configuration as the heat insulating wall described in the second embodiment except that the shape of the inflow grid 46 of the refrigeration return duct 44c is different. Therefore, substantially the same parts are denoted by the same reference numerals.

  The freezing return duct 44c is provided with an inflow grid 46 for preventing articles stored in the frozen state from the inlet 441 and the user's hand (finger) from entering. As shown in FIG. 8, the inflow grid 46 has fins 461 whose front side is inclined downwardly arranged in parallel in the depth direction of the refrigerator Rf (parallel arrangement). In the inflow grid 46 of the refrigeration return duct 44c shown in FIG. 8, four fins 461 are arranged at intervals of T in the depth direction of the refrigerator Rf.

  The plane inclined portion 452 of the airflow direction changing portion 45 of the refrigeration return duct 44c is connected to the bottom portion of the concave groove 440 on the far side from the side of the end portion on the far side of the inflow port 441. The plane inclined portion 452 and the bottom portion of the concave groove 440 are a plane connecting the lower end portion of the fin 4611 located on the innermost side among the four fins 461 and the upper end portion of the fin 4612 immediately before the fin 4611. The connection is made at a portion P where the bottom surface of the concave groove 440 intersects. When the freezer compartment R1 is viewed from the door 21 side, a straight line connecting the lower end portion of the fin 4611 and the upper end portion of the fin 4612 is a line of sight reaching the deepest part of the freezing return duct 44c. Since the connecting portion between the flat inclined portion 452 and the bottom of the concave groove 440 is formed at the end of the range where the line of sight reaches, the liquid flowing into the refrigeration return duct 44c flows in a range invisible to the user. Thereby, it is possible to suppress the user from feeling uneasy due to the visual recognition of the liquid frozen in the freezing return duct 44c.

  Note that, in the refrigeration return duct 44c, a straight line connecting the lower end portion of the fin 4611 where the connecting portion between the flat inclined portion 452 and the bottom portion of the concave groove 440 is the farthest side and the upper end portion of the fin 4612 in front one is Although it is a portion connected at the portion where the bottom surface of the groove 440 intersects, it is not limited to this. The connection part may be further formed in the back. When the inclination angle θ ° of the flat inclined portion 452 is smaller than a predetermined angle, the connecting portion between the flat inclined portion 452 and the concave groove 440 may be on the front side, but the connecting portion always flows. The far side of the entrance 440 is the far side.

  Other features are the same as in the second embodiment.

(Fourth embodiment)
Another example of the refrigeration return duct, which is a main part of the refrigerator according to the present invention, will be described with reference to the drawings. FIG. 9 is an enlarged cross-sectional view of the vicinity of the inlet of the refrigeration return duct of the heat insulating wall. The heat insulating wall shown in FIG. 9 has the same configuration as the heat insulating wall described in the third embodiment except that the inflow grid 47 of the refrigeration return duct 44d is different. Therefore, substantially the same parts are denoted by the same reference numerals.

  In the inflow lattice 47 of the refrigeration return duct 44d shown in FIG. 9, six fins 471 are arranged side by side. In the refrigeration return duct 44d, the lower end of the innermost fin 4711 and the bottom surface of the concave groove 440 connecting the upper end of the fin 4712 just before the fin 4711 intersect at the lower part of the inflow port 441. In such a configuration, the user's line of sight from the front side is blocked by the inflow grid 47. However, in order to reduce the flow resistance of the return air flow, the connecting portion between the plane inclined portion 452 of the airflow direction changing portion 45 and the bottom surface of the concave portion 440 overlaps the innermost portion of the inflow port 441 or deeper than that. It is formed to become.

  By providing the refrigeration return duct 44d formed in this way, the flow direction is changed while suppressing the flow resistance of the return air in the freezer compartment R1, and the user feels uneasy by the liquid frozen in the refrigeration return duct 44d. Can be suppressed. In the refrigeration return duct 44d of the present embodiment, the wind direction conversion unit 45 including the curved surface portion 451 and the flat inclined portion 452 is employed. However, even if the wind direction conversion portion 442 formed only by the curved surface portion is employed. Good.

  Other features are the same as in the third embodiment.

(Fifth embodiment)
Another example of the refrigeration return duct, which is a main part of the refrigerator according to the present invention, will be described with reference to the drawings. FIG. 10 is an enlarged cross-sectional view of the vicinity of the inlet of the refrigeration return duct of the heat insulating wall. The heat insulating wall shown in FIG. 10 has the same configuration as the heat insulating wall described in the first embodiment except that the groove 48 of the refrigeration return duct 44e is different. Therefore, substantially the same parts are denoted by the same reference numerals.

  As shown in FIG. 10, the bottom surface 481 of the groove 48 of the refrigeration return duct 44e is inclined downward toward the back side of the refrigerator Rf. By inclining in this way, even when a large amount of liquid flows into the refrigeration return duct 44e, the liquid that has flowed in can be reliably flowed to the drain water receiving portion 41. Thereby, even if a large amount of liquid flows into the refrigeration return duct 44e, the liquid freezes without the refrigeration return duct 44e, and an increase in the flow resistance of the return air flowing through the refrigeration return duct 44e can be suppressed.

  In the refrigeration return duct 44e, the concave groove 48 has a configuration in which the entire bottom surface 481 is inclined. However, the present invention is not limited to this, and the front side is horizontal and the back side is inclined downward. May be. When the liquid flows into the refrigeration return duct 44e, it flows backward in the same manner as the return air in the air direction conversion section 442. Therefore, it is possible to prevent the liquid from accumulating in the concave groove 48 by making the bottom surface 481 incline at least from a portion in front of the portion where the flow of the liquid stops.

  Other features are the same as those shown in the first to fourth embodiments.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to this content. The embodiments of the present invention can be variously modified without departing from the spirit of the invention.

DESCRIPTION OF SYMBOLS 1 Case 21, 22 Door 3 Cooling device 31 Compressor 32 Condenser 33 Capillary tube 34 Evaporator (cooler)
4 Insulating wall 41 Drain water receiver 42 Ventilation duct 43 Refrigeration return ducts 44, 44b to 44e Refrigeration return duct 440 Concave groove 441 Inlet 442 461 Fin

Claims (5)

A refrigerator for storing articles at a low temperature,
A heat insulating wall that divides the internal space into two spaces, an upper freezer compartment and a lower refrigerator compartment,
A cooler storage chamber that is provided on the back side of the freezer compartment and stores a cooler;
A freezing return duct that is formed in the heat insulating wall and extends from the near side to the far side and returns the air that has cooled the freezing chamber to the cooler housing chamber,
The refrigeration return duct is provided with an inlet opening at the upper end of the heat insulating wall at the end on the near side,
The refrigerator characterized by inclining so that the lower part of the inflow port of the bottom face of the refrigeration return duct may fall toward the back side. The depth of the refrigeration return duct is equal to or greater than the length of the inlet in the depth direction;
The lower part of the inlet of the bottom surface of the refrigeration return duct is a cutting circle whose radius is the length of the inlet in the depth direction of the refrigeration return duct with the end of the inlet on the cooler storage chamber side as the center. The refrigerator of Claim 1 which has a tubular-shaped curved surface part.   The cooler according to claim 1 or 2, wherein a lower portion of the inlet of the refrigeration return duct has a flat inclined portion formed in a flat shape. A plurality of fins are arranged in the depth direction at the inflow port,
Among the plurality of fins, a portion where a surface connecting a lower end portion of the innermost fin and an upper end portion of the fin immediately before the innermost fin intersects with a bottom surface of the refrigeration return duct is the inlet. The bottom surface of the refrigeration return duct is connected to the bottom end of the innermost fin and the upper end of the fin immediately before the innermost fin. The refrigerator according to any one of claims 1 to 3, wherein the refrigerator is inclined to a portion where the bottom surface of the refrigeration return duct intersects.   The refrigerator according to any one of claims 1 to 3, wherein the entire bottom surface of the refrigeration return duct is inclined toward the back side.

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