JPH1114232A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator capable of contriving energy saving by a method wherein the freezing in a cold air re-circulating duct is prevented, frosting on an evaporator is reduced and an interval between defrosting operations is elongated. SOLUTION: A refrigerator is constituted of an inner casing 3, wherein a refrigerating chamber 7 is formed in an upper stage, a vegetable chamber 9 is formed in a middle stage and a freezing chamber 8 is formed in a lower stage through first and second partitioning walls 5, 6, an evaporator 10, installed on the back surface side of the freezing chamber 8, a fan 11, circulating cold air obtained through heat exchange in the evaporator 10 into respective chambers, and an evaporating pan 12, receiving drain, produced by defrosting and flowing down from the evaporator 10, through a drain pipe 13. In this case, a first refrigerating chamber cold air re-circulating duct 22 for returning cold air from the refrigerating chamber 7 into the upper part of back surface of the freezing chamber 8 is formed on the back surface of refrigerating chamber above the evaporator 10, a second refrigerating chamber cold air re-circulating duct 33, communicating the lower part of the first refrigerating chamber cold air re-circulating duct 22 with the lower part of the evaporator 10, is provided and a second drain pipe 24, branched from the lower part of the first refrigerating chamber cold air re- circulating duct 22 and communicated with the evaporating pan 12 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator of a forced air circulation type, and more particularly to a structure of an air passage for guiding cool air in a refrigerator or the like.

[0002]

2. Description of the Related Art As shown in FIGS. 3 and 4, for example, a conventional refrigerator has a main body 1 composed of an outer box 2, an inner box 3, and a heat insulating material 4 filled between these two boxes. The first partition wall 5 and the second partition wall 6 form a refrigerator compartment 7 in an upper stage, a freezing compartment 8 in a middle stage, and a vegetable compartment 9 in a lower stage. An evaporator 10 installed on the back side of the freezing chamber 8;
The cold air heat-exchanged in the refrigerator room 8, the refrigerator room 7, and the vegetable room 9
Blower 11 circulating to the evaporator 10 and defrost water flowing down from the evaporator 10 are guided through a drain pipe 13 into a machine room formed at the lower part of the main body 1 and provided near the compressor 14 to receive the defrost water. And an evaporating dish 12.

The cool air generated by the evaporator 10 is supplied to a blower 11
Is supplied to the freezer compartment 8, and is connected to a cool compartment air inlet 16 at the top of the evaporator 10 connected to the cool air distribution compartment 15 via a refrigerator compartment duct 17. The cold air is uniformly supplied to the refrigerator compartment 7 from the refrigerator air outlet 18 provided in the refrigerator compartment 7 as shown by the solid arrow. The cool air circulated in the refrigerator compartment 7 is supplied to the vegetable compartment cool air outlet 20 via a vegetable compartment duct 19a connected from a vegetable compartment cool air inlet 19 provided at the lower part of the refrigerator compartment 7 as shown by a broken line arrow. It is supplied to the vegetable room 9. The cool air supplied to the vegetable compartment 9 and circulated is cooled by a cool air circulation duct 25 formed on the second partition wall 6.
It is returned to the lower part of the evaporator 10 through b.

By the way, the air returned to the cool air reflux duct 25b is heated to 5 to 10 ° C. which contains a lot of moisture due to the opening and closing of the doors of the refrigerator compartment 7 and the vegetable compartment 9 and diffusion of moisture from food. . For this reason, there was a problem that the evaporator 10 was frosted by the air containing much moisture returned from the vegetable compartment 9 to the evaporator 10. On the other hand, when the blower 11 is stopped, there is a problem that the cool air flows backward from the evaporator 10 to the cool air recirculation duct 25b and freezes in the cool air recirculation duct.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, by preventing freezing in a cool air recirculation duct and reducing frost on an evaporator by backflow of cool air from an evaporator. It is another object of the present invention to provide a refrigerator that can extend the defrost interval and save energy.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has an insulating box comprising an outer box, an inner box and a heat insulating material filled between the two boxes; It is arranged in the body, a refrigerator compartment in the upper stage, a vegetable compartment in the middle stage, a first partition wall and a second partition wall forming a freezing room in the lower stage, and an evaporator installed on the back side of the freezing room, A blower that circulates the heat-exchanged cool air to the freezing room, the cold room, and the vegetable room, and a duct for the cold room that communicates with the upper portion of the back of the cold room from the upper portion of the evaporator and sends out the cold air to the cold room, Vegetable compartment duct for sending cool air from the refrigerator compartment lower portion to the vegetable compartment upper portion, a freezer compartment cool air recirculation path for returning cold air from the freezer compartment lower portion to the evaporator lower portion, and defrost water flowing down from the evaporator. It is led through a first drain pipe into a machine room formed below the heat insulating box, A first refrigerating compartment cold air recirculation duct for returning cold air from an upper portion to an upper portion on the back side of the freezing compartment outside the inner box of the refrigerating compartment in a refrigerator comprising an evaporating dish provided near the machine and receiving the defrost water. At the same time, the upper part of the vegetable compartment communicates with the upper part of the first refrigerating compartment cold air recirculation duct and joins, forming a vegetable compartment cool air recirculating duct for returning cold air to the upper rear part of the freezer compartment, and forming the first refrigerating compartment cold air recirculation. From the lower part of the duct, a second refrigerating compartment cold air recirculation duct communicating with the lower part of the evaporator is provided, while a second drain pipe branched from the lower part of the first refrigerating compartment cold air recirculating duct and communicating with the evaporating dish is provided. Configuration.

[0007] Further, the suction port of the first refrigerating compartment cold air recirculation duct is formed in the upper part of the refrigerating compartment. Further, the cool air return port of the second refrigerating room cool air recirculation duct is formed above the evaporator. Further, the first refrigerating compartment cold air recirculation duct is formed on the back surface or side surface of the inner box. Further, the vegetable room cool air recirculation duct is formed on the back surface or side surface of the inner box.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An upper refrigerator compartment, a middle vegetable compartment, a lower freezer compartment, and an evaporator installed on the back side of the above-mentioned freezer compartment, wherein the box body is partitioned by partition walls, A blower that circulates the cold air heat exchanged in the freezing room, the refrigerator room and the vegetable room, and guides the defrost water flowing down from the evaporator through a first drain pipe into a machine room formed at the lower part of the heat insulating box. ,
In a refrigerator comprising an evaporating dish provided near the compressor and receiving the defrost water, a first refrigerating compartment cold air recirculation duct for returning cold air from an upper portion outside the inner box of the refrigerating compartment is formed, and the first refrigerating compartment is provided. A second refrigerating compartment cold air recirculation duct is provided from the lower portion of the cold recirculation duct to communicate with the lower portion of the evaporator, and a second drain pipe branched from the lower portion of the first refrigerating compartment cold air recirculation duct and communicating with the evaporating dish is provided. With the configuration provided, the backflow of the cool air from the evaporator prevents freezing in the first and second refrigerator compartment cool air reflux ducts and the second drain pipe,
Cool the first refrigerator compartment cold air reflux duct to a temperature that does not freeze,
By condensing the moisture in the return air and draining it in a liquid state, frost formation on the evaporator can be reduced, and the interval between defrosting can be lengthened to save energy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 shows the inside of a refrigerator from the side, and 1 is a refrigerator body composed of an outer box 2, an inner box 3, and a heat insulating material 4 filled between these two boxes. Reference numeral 5 denotes a first partition wall, and reference numeral 6 denotes a second partition wall, which forms a refrigerator room 7 in an upper stage, a vegetable room 9 in a middle stage, and a freezing room 8 in a lower stage. Reference numeral 10 denotes an evaporator installed on the back side of the freezing room 8,
Reference numeral 11 denotes a blower for forcibly circulating the cool air heat-exchanged by the evaporator 10 to the freezing room 8, the refrigerating room 7 and the vegetable room 9. 12 guides the defrost water flowing down from the evaporator 10 through a first drain pipe 13 into a machine room formed at a lower portion of the main body 1, and
14 is an evaporating dish provided near 14 to receive the defrost water.

The cool air generated by the evaporator 10 is supplied to a blower 11
Is supplied to the freezer compartment 8, and is connected to a cool compartment air inlet 16 at the top of the evaporator 10 connected to the cool air distribution compartment 15 via a refrigerator compartment duct 17. The cold air is uniformly supplied to the refrigerator 7 from the cold air outlet 18 in the refrigerator as shown by the solid arrow. In addition, refrigerator room 7
Cool air is supplied to the vegetable compartment 9 from the vegetable compartment cool air outlet 20 through a vegetable compartment duct 19a connected to the vegetable compartment cool air inlet 19 provided at the lower part of the container.

A first refrigerating compartment cold air recirculation duct 22 is formed which is connected to a refrigerating compartment suction port 21 provided on the upper rear surface of the refrigerating compartment 7, passes through the back surface of the inner box 3 and communicates with the lower portion of the refrigerating compartment 7. At the same time, the vegetable room cold air recirculation duct 26 is connected to the vegetable room suction port 26a provided at the upper part of the vegetable room 9 and passes through the back of the inner box 3 and communicates with the upper part of the first refrigerator room cold air recirculation duct 22. A second refrigerating compartment cool air recirculation duct 23 is formed to communicate with a lower portion of the evaporator 10 from a lower portion of the first refrigerating compartment cold air recirculation duct 22, and the first refrigerating compartment cold air recirculation duct 22 is formed.
A second drain pipe 24 communicating with the evaporating dish 12 is formed from a lower part of the drain pipe. Further, the cool air return port 23 of the second refrigerator compartment cool air recirculation duct 23 is located above the inlet 24a of the second drain pipe 24.
a is provided to return cool air to the lower part of the evaporator 10. The cool air supplied to the freezing room 8 is configured to return the cool air to the lower portion of the evaporator 10 through the freezing room cool air recirculation passage 25. Further, the first refrigerator compartment cool air recirculation duct 22 and the vegetable compartment cool air recirculation duct 26 may be formed on the side surface of the inner box 3.

In the above configuration, the first refrigerating room cold air recirculation duct 22 is arranged on the back surface of the inner box of the refrigerating room 7 and circulates in the refrigerating room 7 by using the inner box as a heat exchange unit.
5-10 ° C warm air containing much moisture due to opening and closing of doors and diffusion of moisture from food can be cooled to 0-5 ° C cold air that does not freeze for dehumidification through the first cool air return duct 22. As a result, moisture in the air can be condensed into a liquid state and drained from the second drain pipe 24 to the evaporating dish 12. On the other hand, the dehumidified and dried air is returned to the lower part of the evaporator 10 from the cool air return port 23a through the cool air return duct 23 in the second refrigerator compartment. As a result, it is possible to prevent freezing from occurring in the first refrigerating compartment cold air recirculation duct 22 and the second refrigerating compartment cold air recirculating duct 23, and to reduce frost formation on the evaporator 10.

[0013]

As described above, according to the refrigerator of the present invention, it is possible to prevent the first and second refrigerating compartment cold air recirculation ducts and the second drain pipe from freezing and to provide the first refrigerating compartment cold air recirculating duct. By cooling to a temperature that does not freeze, condensing the moisture in the return air and draining it in a liquid state, it is possible to reduce frost formation on the evaporator, prolong the defrosting interval and save energy .

[Brief description of the drawings]

FIG. 1 is a side sectional view of a refrigerator showing an embodiment of the present invention.

FIG. 2 is a front view of the refrigerator showing an arrangement of ducts and an air passage according to the embodiment of the present invention.

FIG. 3 is a side sectional view of a refrigerator showing a conventional example.

FIG. 4 is a front view of a refrigerator showing an arrangement of ducts and an air passage according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 3 Inner box 5 First partition wall 6 Second partition wall 7 Refrigerator room 8 Freezer room 9 Vegetable room 10 Evaporator 11 Blower 12 Evaporating dish 13 First drain pipe 15 Cold air distribution room 16 Cold room cold air inlet 17 Refrigerator Room duct 18 Cold room cold air outlet 19 Vegetable room cold air inlet 20 Vegetable room cold air outlet 21 Cold room inlet 22 First cold room cold air return duct 23 Second cold room cool air return duct 24 Second drain pipe 24a Inlet 25 Freezer room cool air return passage 26 Vegetable room cool air return duct 26a Vegetable room suction port

Claims (5)

[Claims] 1. An insulating box body comprising an outer box, an inner box, and a heat insulating material filled between the two boxes, disposed in the insulating box body, a refrigerator room in an upper stage, a vegetable room in a middle stage, and a freezing room in a lower stage. A first partition wall and a second partition wall that form, an evaporator installed on the back side of the freezing room, and a blower that circulates cold air heat exchanged by the evaporator to the freezing room, the refrigerator room, and the vegetable room. A duct for a refrigerator compartment that communicates from the upper part of the evaporator to an upper rear part of the refrigerator compartment and sends out cool air to the refrigerator compartment; and a duct for vegetable compartment that sends cool air from the lower part of the refrigerator compartment to the upper part of the vegetable compartment. A freezer return path for returning cool air from the lower part of the freezer to the lower part of the evaporator; and a defrosting water flowing down from the evaporator through a first drain pipe to a machine room formed at a lower part of the heat insulating box. The evaporating dish provided near the compressor and receiving the defrost water. Outside the inner box of the refrigerating compartment, forming a first refrigerating compartment cold air recirculation duct for returning cold air from the upper part to the upper rear part of the freezing compartment, and forming the first refrigerating compartment cold air recirculation duct from the upper part of the vegetable compartment. A second refrigerator which communicates with an upper part and forms a vegetable room cool air recirculation duct for returning cold air to an upper rear part of the freezing room, and a lower part of the first refrigerator room cool air recirculation duct and communicates with a lower part of the evaporator. A refrigerator comprising a room cold air recirculation duct and a second drain pipe branched from a lower portion of the first refrigerating room cold air recirculation duct and communicating with the evaporating dish. 2. The refrigerator according to claim 1, wherein a suction port of the first refrigerating compartment cold air recirculation duct is formed in an upper portion of the refrigerating compartment. 3. The refrigerator according to claim 1, wherein a cool air return port of the cool air reflux duct in the second refrigerator compartment is formed above the evaporator. 4. The refrigerator according to claim 1, wherein the first refrigerating compartment cold air recirculation duct is formed on a back surface or a side surface of the inner box. 5. The refrigerator according to claim 1, wherein the vegetable room cool air recirculation duct is formed on the back surface or side surface of the inner box.