JP5529218B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator having a discharge passage for discharging cool air generated by a cooler to a storage chamber and a return passage for returning the cool air from the storage chamber to the cooler.

  A conventional refrigerator is disclosed in Patent Document 1. 10 and 11 are a front sectional view and a side sectional view showing a schematic configuration of the refrigerator. The refrigerator 1 is provided with a freezer compartment 2 at the top, and a refrigerator compartment 3 below the freezer compartment 2. The freezer compartment 2 and the refrigerator compartment 3 are partitioned by a partition wall 4 filled with a heat insulating material. The front surface of the freezer compartment 2 is opened and closed by a door 2a, and the front surface of the refrigerator compartment 3 is opened and closed by a door 3a.

  A cooler 5 that generates cool air is disposed on the back of the freezer compartment 2, and a blower fan 6 is disposed above the cooler 5. The cooler 5 and the blower fan 6 are arranged in a freezer compartment duct (not shown) provided on the back surface of the freezer compartment 2. The freezer duct is provided with a return port (not shown) that opens toward the freezer 3 below the cooler 5.

  A communication passage 7 connected to the exhaust side of the blower fan 6 is provided on the side of the cooler 5. A discharge passage 8 that communicates with the communication passage 7 extends in the vertical direction at a central portion in the left-right direction on the back surface of the refrigerator compartment 3. Discharge ports 8 a for discharging cool air are opened on both sides of the discharge passage 8. In the partition wall 4, a return passage 9 having a return port 9 a that opens at the front of the refrigerator compartment 3 is provided. The return passage 9 is connected to the freezer compartment duct of the freezer compartment 3 below the cooler 5.

  In the refrigerator 1 having the above configuration, the cold air generated by exchanging heat with the cooler 5 is discharged into the freezer compartment 2 as indicated by an arrow D 1 by driving the blower fan 6. The cold air discharged into the freezer compartment 2 flows through the freezer compartment 2 to cool the stored items, and returns to the cooler 5 through the return port of the freezer compartment duct.

  The cold air flowing through the freezer compartment duct branches on the exhaust side of the blower fan 6 and flows through the communication passage 7 and the discharge passage 8 as indicated by the arrow D2. The cold air flowing through the discharge passage 8 is discharged from the discharge port 8a into the refrigerator compartment 3 as indicated by an arrow D3. The cold air discharged into the refrigerator compartment 3 flows through the refrigerator compartment 3 to cool the stored items, and flows into the return passage 9 from the return port 9a at the front portion of the refrigerator compartment 3 as indicated by an arrow D4. The cold air flowing through the return passage 9 returns to the cooler 5 through the freezer compartment duct of the freezer compartment 3 as indicated by an arrow D5.

Japanese Patent No. 3892814 (pages 4-8, FIG. 1)

  However, according to the conventional refrigerator 1, the cold air flowing through the return passage 9 contains water and the like of stored items while flowing through the refrigerating chamber 3, and thus is easily frozen. For this reason, it is necessary to provide a heat insulating material having a predetermined thickness above and below the return passage 9 in the partition wall 4, and the thickness of the partition wall 4 increases. Therefore, there is a problem that the internal volume of the refrigerator 1 is reduced and the volumetric efficiency is lowered.

  Moreover, the cool air discharged from the discharge port 8a provided in the discharge passage 8 arranged in the central portion in the left-right direction flows and the inside of the refrigerator compartment 3 is cooled. For this reason, the cold air discharged from the discharge port 8a does not reach the entire refrigerating chamber 3, and the temperature distribution becomes non-uniform so that the cooling efficiency is lowered.

  An object of this invention is to provide the refrigerator which can improve volumetric efficiency and cooling efficiency.

  The present invention relates to a storage room for storing stored items in a cold state, a cooler for generating cold air, and a cold air that is disposed on the back surface of the storage room and flows through the first cooler through the cooler. A cooler is returned to the cooler via a discharge passage for discharging cool air to the storage chamber, and a return passage which is arranged in parallel to the discharge passage and arranged on the rear surface of the storage chamber and from which the cool air flows out. A return passage, a member made of a plate-like thermal conductor covering a front wall made of a heat insulating material of the discharge passage or the return passage, an isolation chamber isolated by a partition portion and provided at a lower portion of the storage chamber, and the partition And a storage case disposed in the isolation chamber with a gap around the upper surface, and the upper and lower sides of the partitioning portion communicate with each other at the front portion of the storage chamber, and cool air to the return port A part of the flow path of the lower part of the storage case It is characterized in that position.

  According to this configuration, the cold air generated by the cooler flows through the discharge passage provided in the back surface of the storage chamber, and is discharged from the first discharge port into the storage chamber. The cool air discharged into the storage chamber flows through the storage chamber to cool the stored item, and flows into the return passage arranged in parallel with the discharge passage through the return port. The cold air flowing through the return passage is returned to the cooler. In addition, the cold heat of the cold air flowing through the discharge passage or the return passage is discharged into the storage chamber through a member made of a good heat conductor such as a front wall of the discharge passage or the return passage and a metal plate.

  In the refrigerator configured as described above, the lower end of the member is disposed above the storage case, and the return port is disposed below the member and between both side ends of the member. It is characterized by that.

  In the refrigerator having the above-described configuration, the discharge passage may be disposed on both sides of the return passage, and the return passage and the front wall of the discharge passage may be integrally formed, and both side portions of the duct may be provided. A recess that is notched and covered by the member is formed, and an opening that forms a first discharge port is formed on both side surfaces of the duct; the opening faces the recess; and the cold air that has flowed from the discharge passage is A space portion that directly circulates in contact with the rear end portion of the member is formed in the concave portion.

  According to this configuration, the return passage is provided in the center of the back surface of the storage chamber by the duct, and the discharge passage is provided on the left and right of the return passage. The cold air flowing through the discharge passage is discharged from a first discharge port formed by openings provided on both side surfaces of the duct. Concave portions are formed on both side portions of the duct, and the cool air flowing through the discharge passage flows into the concave portions forming the space portion from the opening portion and directly contacts the member.

  Moreover, the present invention is characterized in that the refrigerator having the above-described configuration is provided with a second discharge port for discharging cool air from the space portion to the storage chamber. According to this structure, the cold air | gas which distribute | circulates a space part is discharged to a storage chamber from the 2nd discharge port provided in the edge part of a member.

  In the refrigerator having the above-described configuration, the member extends to the periphery of the discharge passage and the return passage to cover the back surface of the storage chamber. According to this configuration, the member covers a large area on the back surface of the storage chamber, and the cold air flowing through the discharge passage or the return passage is conducted through the member and discharged from a wide range.

  According to the present invention, since the discharge passage for discharging cold air and the return passage for returning the cold air to the cooler are arranged in parallel on the back surface of the storage chamber, there is no need to provide a return passage in the partition wall with the other storage chamber. Can be reduced in thickness. Therefore, the volumetric efficiency of the refrigerator can be improved. Further, the cold heat of the cold air flowing through the discharge passage or the return passage is transmitted to the member through the front wall, and the small amount of cold air flowing through the space is directly transferred to the member. Thereby, cold heat is emitted from a wide range of the back surface of the storage chamber through the member, and the storage chamber can be uniformly cooled to improve the cooling efficiency. In addition, it is possible to optimize the amount of cold transmitted to the member by the front wall of the discharge passage or the return passage and the space where the cool air directly contacts the member. Accordingly, it is possible to cool the storage chamber by preventing condensation due to excessive cooling of the member.

Side surface sectional drawing which shows the refrigerator of embodiment of this invention Front sectional drawing which shows the refrigerator of embodiment of this invention AA sectional view of FIG. Detailed view of part H in FIG. The front view which shows the panel of the refrigerator of embodiment of this invention Side surface sectional drawing which shows the detail of the protrusion part of the refrigerator of embodiment of this invention Side surface sectional drawing which shows the cross section which passes along the discharge passage of the refrigerator of embodiment of this invention BB sectional view of FIG. Side surface sectional drawing which shows the cross section which passes along the return channel | path of the refrigerator of embodiment of this invention Front sectional view showing a conventional refrigerator Side sectional view showing a conventional refrigerator

  Embodiments of the present invention will be described below with reference to the drawings. For convenience of explanation, the same reference numerals are assigned to the same parts as those in the conventional example shown in FIGS. 1 and 2 are a side sectional view and a front sectional view showing a refrigerator according to one embodiment. The refrigerator 1 is provided with a freezer compartment 2 at the top, and a refrigerator compartment 3 (storage compartment) is provided below the freezer compartment 2. The freezer compartment 2 and the refrigerator compartment 3 are partitioned by a partition wall 4 filled with a heat insulating material. The front surface of the freezer compartment 2 is opened and closed by a door 2a, and the front surface of the refrigerator compartment 3 is opened and closed by a door 3a.

  A freezer compartment duct 10 is provided on the back of the freezer compartment 2. A discharge port 10a is provided in the upper part on the front side of the freezer compartment duct 10, and a return port 10b is provided in the lower part. A cooler 5 that generates cool air is disposed in the freezer compartment duct 10, and a blower fan 6 is disposed above the cooler 5. Below the cooler 5, a drain pan 11 that collects defrosted water from the cooler 5 is provided. Further, the freezer compartment duct 10 has a communication passage 7 that branches off on the exhaust side of the blower fan 6 and is arranged on the right side of the cooler 5.

  A low-temperature case 18 capable of low-temperature storage such as a chilled temperature zone is disposed at the upper part of the refrigerator compartment 3. The back surface of the low-temperature case 18 is opened, and cold air flows from a discharge port 20c described later. Below the low-temperature case 18, a plurality of mounting shelves 13 that are formed of a transparent resin molded product and on which stored items are placed are provided. The mounting shelf 13 is placed on the upper surface of a plurality of rails 13a projecting from the side wall of the refrigerator compartment 3, and the position in the height direction can be changed in time according to the stored item.

  A vegetable room 16 comprising an isolation room is provided at the lower part of the refrigerator compartment 3. The vegetable compartment 16 is partitioned from the upper part of the refrigerator compartment 3 by a plate-shaped partition 14 formed of a resin molded product. The upper and lower sides of the partition part 14 communicate with each other through a communication part 14 a in front of the partition part 14. An opening 14 b is provided at the rear end of the partition 14. In the vegetable compartment 16, a storage case 15 whose upper surface is closed by the partition 14 is arranged to be freely put in and out. The storage case 15 is arranged with a gap 16 a through which cold air flows between the wall of the vegetable compartment 16.

  A discharge passage 20 and a return passage 23 extending in the vertical direction are arranged in parallel on the rear surface of the refrigerator compartment 3. The discharge passage 20 has a left passage 21 and a right passage 22 disposed on the left and right sides of the return passage 23, respectively. A plurality of discharge ports 20b for discharging cool air are provided on the left side surface of the left passage 21 and the right side surface of the right passage 22, respectively.

  A lamp 30 whose front surface is covered with a transparent lamp cover 31 is disposed in front of the upper portion of the return passage 23. Since the mounting shelf 13 is made of a transparent resin, the light emitted from the lamp 30 passes through each mounting shelf 13. Thereby, it can illuminate to the lower part of the refrigerator compartment 3. The lamp 30 is disposed above a metal member 27 described later. For this reason, the emitted light of the lamp 30 is reflected by the member 27, and the inside of the refrigerator compartment 3 can be made brighter.

  If an opening is provided in the mounting shelf 13, illumination light can easily reach the lower part of the refrigerator compartment 3. In addition, the cool air discharged from the discharge port 20b can be guided to the lower mounting shelf 13 to further cool the stored items on each mounting shelf 13. At this time, rib-shaped protrusions for reinforcement may be provided around the opening of the mounting shelf 13. Further, if the transparent lamp cover 31 is disposed so as to cover the lamp 30, the emitted light from the lamp 30 can easily reach the lower part of the refrigerator compartment 3.

  Further, the cold heat of the cold air flowing through the return passage 23 is discharged into the lamp cover 31 through a panel 36 (see FIG. 4) described later. Thereby, the lamp 30 can be cooled, and the temperature rise of the refrigerator compartment 3 due to the heat generated by the lamp 30 can be reduced. A control unit for controlling the driving of the lamp 30 may be provided in the lamp cover 31, and the inside of the lamp cover 31 may be used as an electrical box. Also in this case, the heat generated in the electrical box is cooled by the cold heat of the cold air flowing through the return passage 23.

  An opening facing the return passage 23 may be provided in the lamp cover 31. Thereby, the air in the lamp cover 31 is sucked into the return passage 23 through the opening. For this reason, the temperature increase of the refrigerator compartment 3 due to the heat generated by the lamp 30 can be further reduced.

  FIG. 3 shows a cross-sectional view taken along the line AA of FIG. The discharge passage 20 and the return passage 23 are formed by attaching a duct 26 formed of a heat insulating material of a foamed resin molded product having a plurality of passages to the back wall of the refrigerator compartment 3. The discharge passage 20 and the return passage 23 are integrally formed by a duct 26 with a front wall 26a, and are separated by ribs 26d and 26e projecting behind the front wall 26a. Thereby, the discharge passage 20 and the return passage 23 are integrally formed, and the number of parts can be reduced.

  The passages of the duct 26 are separated by a heat insulating material. For this reason, even if there is a temperature difference between the cold air flowing through the discharge passage 20 and the cold air flowing through the return passage 23, the amount of cold heat transferred between them becomes minute. For this reason, it is possible to prevent the cooling efficiency of the refrigerator compartment 3 from being lowered due to the cold heat of the cold air flowing through the discharge passage 20 being transmitted to the cold air flowing through the return passage 23.

  FIG. 4 shows a detailed view of a portion H in FIG. The front side of the duct 26 is covered with a panel 36 of a resin molded product. As shown in the front view of FIG. 5, the panel 36 has a plurality of openings 36b on the front side. Thereby, the weight of the panel 36 can be reduced and attachment can be made easy. The duct 26 and the panel 36 are integrally formed by engaging a concave portion and a convex portion provided respectively, and are detachably attached to the back surface of the refrigerator compartment 3.

  The panel 36 has a groove 36a that is bent in a U-shaped cross section at both ends on the front side. The duct 26 made of a heat insulating material is formed with a recess 26f that escapes the groove 36a. An engaging claw 36d is provided on the outer side wall of the groove 36a. The front wall 26 a of the duct 26 and the front side of the panel 36 are covered with a plate-like member 27. The member 27 is made of a good heat conductor such as a metal plate (aluminum, stainless steel, etc.) and has a high thermal conductivity. The member 27 may be formed of a resin having high thermal conductivity.

  Both ends of the member 27 are bent rearward, and the engaging claws 36d engage with engaging holes 27a provided in a portion extending rearward. Thereby, the member 27 which covers the front wall 26a of the discharge passage 20 and the return passage 23 is detachably attached. Further, the space portion 50 is formed by closing the front surface of the groove portion 36 a with the member 27.

  The outer side wall of the groove 36a extends rearward and covers the side surface of the duct 26 that opens the opening 26g. A side surface of the panel 36 opens to face the opening 26g, and a discharge port 20b (first discharge port) of the discharge passage 20 is formed. The opening 26g opens toward the concave portion 26f, and a communication port 36c that allows the opening 26g to communicate with the inside of the groove 36a opens on the bottom surface of the groove 36a of the panel 36. Thereby, cold air is guide | induced to the space part 50 through the opening part 26g and the communicating port 36c.

  The cold heat of the cold air flowing through the discharge passage 20 and the return passage 23 is transmitted to the member 27 through the front wall 26a. Further, the cold air guided from the discharge passage 20 to the space 50 is in direct contact with the member 27, and the cold heat is transmitted to the member 27. Since the member 27 is made of a good heat conductor, the cold heat transmitted to the member 27 is released from the entire member 27 into the refrigerator compartment 3.

  Thereby, the temperature distribution of the refrigerator compartment 3 can be made uniform. At this time, the temperature of the cold air flowing through the discharge passage 20 (about −12 to −8 ° C.) is lower than the temperature of the cold air flowing through the return passage 23 (about −2 to 1 ° C.). However, since the discharge passage 20 and the return passage 23 are arranged side by side, the surface of the member 27 becomes a uniform temperature by heat conduction, and the temperature distribution in the refrigerator compartment 3 can be easily made uniform.

  The thickness of the front wall 26a of the duct 26 may be formed so that the portion facing the return passage 23 is thinner than the portion facing the discharge passage 20. Thereby, the amount of cold heat per unit area transmitted from the return passage 23 to the member 27 and the amount of cold heat per unit area transmitted from the discharge passage 20 to the member 27 can be made comparable. Therefore, since the variation in the surface temperature of the member 27 can be further reduced, the temperature distribution in the refrigerator compartment 3 can be made more uniform. In addition, it is possible to suppress the condensation on the surface of the member 27 by increasing the thickness of the heat insulating material facing the discharge passage 20 through which cooler cold air flows.

  FIG. 6 is a side sectional view showing details of the lower part of the panel 36. At the lower part of the panel 36, a protruding portion 36g protruding forward is provided. A convex portion 36h that protrudes downward is provided at the lower front portion of the protruding portion 36g. The rear end of the protruding portion 36g is locked to the step portion 35b formed in the inner box 35a of the heat insulating box 35, and the convex portion 36h contacts the upper surface of the partition portion 14. Thereby, the protrusion part 36g is stably supported. Further, return ports 23a and 23b of the return passage 23 are formed on the front surface and the lower surface of the protruding portion 36g. The return port 23b is provided facing the opening 14b (see FIG. 1).

  The protruding portion 36 g extends forward of the member 27 and is formed below the member 27. The lower end of the member 27 is supported by a support portion 36j extending forward from the panel 36 above the projecting portion 36g. A notch 36k is formed on the upper surface of the protrusion 36g, and the receiving member 34 is attached to the notch 36k.

  The receiving member 34 is made of a resin molded product, and is formed with a recess 34a having an upper surface opened. A protrusion 34c protruding outward is formed on the periphery of the recess 34a. A convex portion 34b is provided below the front protruding portion 34c. The rear protrusion 34c is inserted into a groove 36m provided on the vertical surface of the panel 36, and the protrusion 34b is pushed into the notch 36k. Thereby, the front end of the notch 36k is sandwiched between the protrusion 34c and the protrusion 34b at the front, and the receiving member 34 is attached.

  Since the protruding portion 36g is arranged below the member 27, the dew condensation generated on the member 27 flows down to the recess 34a. Thereby, the dew condensation water stored by the recessed part 34a can evaporate, and the drying in the refrigerator compartment 3 can be suppressed. By adhering or welding the receiving member 34 and the notch 36k with a sealant or the like, it is possible to prevent dew condensation from entering the protrusion 36g.

  The panel 36 can be easily attached and detached by placing a finger on the concave portion 34a and the convex portion 36h on the lower surface of the protruding portion 36g.

  Concavities and convexities extending in the horizontal direction may be provided on the front surface of the member 27, and the condensation generated on the member 27 may be retained by the concavities and convexities. Thereby, the dew condensation water hold | maintained at the unevenness | corrugation of the member 27 evaporates, and it can further suppress the drying in the refrigerator compartment 3. FIG.

  FIG. 7 is a side sectional view showing a section passing through the discharge passage 20. The discharge passage 20 communicates with the communication passage 7 via the damper 17 at the upper portion. FIG. 8 is a cross-sectional view taken along the line BB in FIG. The discharge passage 20 has a branch portion 20 a disposed below the damper 17 on the front side of the return passage 23. The discharge passage 20 branches into a left and right left passage 21 and a right passage 22 (see FIG. 2) at a branching portion 20a.

  The return passage 23 has first and second branch passages 24 and 25 that branch left and right at the top. FIG. 9 is a side sectional view showing a section passing through the return passage 23. The first and second branch paths 24 and 25 are disposed on the back side of the freezer compartment duct 10. The freezer compartment duct 10 and the first and second branch passages 24 and 25 communicate with each other through communication ports 24a and 25a opened to the back side of the freezer compartment duct 10 below the cooler 5.

  A receiving portion 12 a of the drain pipe 12 is disposed below the drain port 11 a of the drain pan 11. The receiving portion 12 a is disposed in front of the first and second branch paths 24 and 25. The drain pipe 12 extends rearward from the receiving portion 12a through the first and second branch paths 24 and 25, and is disposed behind the return passage 23 and extends downward. The defrost water collected in the drain pan 11 is drained to an evaporating dish (not shown) through the drain pipe 12. Therefore, the return passage 23 branches into the first and second branch passages 24 and 25 and the flow passage area is not reduced, and interference between the return passage 23 and the drainage pipe 12 can be easily prevented.

  In the refrigerator 1 having the above-described configuration, air flowing through the freezer compartment duct 10 is driven by the blower fan 6 to exchange heat with the cooler 5 to generate cold air. The cool air generated by the cooler 5 is discharged into the freezer compartment 2 from the discharge port 10a as indicated by an arrow E1 (see FIG. 1). The cold air discharged into the freezer compartment 2 flows through the freezer compartment 2 to cool the stored items, and returns to the cooler 5 through the return port 10b.

  Further, the cold air is branched on the exhaust side of the blower fan 6 as shown by an arrow E <b> 2 (see FIGS. 2 and 7) and flows through the communication path 7. The cold air flowing through the communication passage 7 flows into the discharge passage 20 via the damper 17 and branches at the branch portion 20a. A part of the cold air flowing into the discharge passage 20 is discharged into the low temperature case 18 from the branch portion 20a through the discharge port 20c as shown by an arrow E3 (see FIG. 1). The low temperature case 18 is maintained at a low temperature because the cold air passing through the damper 17 is immediately supplied. The cold air flowing through the low temperature case 18 flows out into the refrigerating chamber 3 mainly from the front side of the low temperature case 18.

  The cold air in the low-temperature case 18 and the cold heat of the stored items are released downward from the lower surface of the low-temperature case 18. The stored items arranged below the low temperature case 18 are directly cooled by the cool air sent to the front of the low temperature case 18 and indirectly cooled by the cold heat released from the lower surface side of the low temperature case 18.

  Thereby, the lower part of the refrigerator compartment 3 can be sufficiently cooled even if the amount of cold air discharged from the discharge port 20b described later is reduced. In particular, the amount of cool air discharged from the lower discharge port 20b can be suppressed. Therefore, it becomes possible to suppress the drying of the stored product as much as possible by the cold air directly hitting the stored product.

  Furthermore, the member 27 provided in front of the panel 36 indirectly cools the lower portion of the low-temperature case 18 by cold heat from at least one of the discharge passage 20 and the return passage 23. For this reason, even if it reduces the amount of cool air discharged from the discharge port 20b, it can cool uniformly and can further reduce the drying of the stored product. In particular, deterioration due to drying of stored items such as raw foods (for example, short cakes, fresh confectionery, vegetables, fruits, etc.) can be suppressed.

  The cold air branched at the branch portion 20a flows down the left passage 21 and the right passage 22 of the discharge passage 20 as shown by arrows E4 and E5 (see FIGS. 2 and 7). The cold air flowing down the discharge passage 20 is discharged from the discharge port 20b into the refrigerator compartment 3 as indicated by an arrow E6 (see FIGS. 1, 2, and 4). At this time, since the discharge port 20b is provided on the side surfaces of the left passage 21 and the right passage 22, it is discharged toward the side as shown in FIGS.

  A part of the cool air flowing down the discharge passage 20 is guided to the space 50 through the opening 26g and the communication port 36c. The cool air guided to the space part 50 flows down the space part 50. The cold air flowing through the space 50 enters the gap between the side wall of the groove 36a and the member 27 through the engagement hole 27a of the member 27 and the bottom of the groove 36a, and is discharged into the refrigerator compartment 3 through the gap. At this time, in order to make the gap between the member 27 and the panel 36 constant, a protrusion (for example, a rib extending in the front-rear direction) that contacts the member 27 may be provided on the inner wall of the groove portion 36a.

  The cold air flowing down the discharge passage 20 is transmitted to the member 27 through the front wall 26a, and the cold air flowing down the space 50 is directly in contact with the member 27 to transmit the cold heat. The cold heat transmitted to the member 27 is released from the entire member 27 to the refrigerating chamber 3 to uniformly cool the inside of the refrigerating chamber 3.

  At this time, the depth of the space 50 is determined by the front end position of the opening 36c, and the cooling of the member 27 can be adjusted by adjusting the amount of cool air flowing through the space 50.

  Note that a protrusion that contacts the member 27 may be provided on the front wall of the duct 26 or the front surface of the panel 36 to form a passage that communicates with the space 50 and extends to the center. Thereby, the cold air | gas which distribute | circulates this channel | path via the space part 50 contacts the center part of the member 27, and can make the member 27 more uniform temperature.

  At this time, if the member 27 is opened and a discharge port facing the refrigerator compartment 3 is provided in the passage, the cold air can be discharged from the central portion of the refrigerator compartment 3 to make the temperature of the refrigerator compartment 3 more uniform. Further, when the duct 26 is opened and an opening portion is provided in the passage so as to return to the passage 23, the refrigerator compartment 3 is indirectly cooled by the cool air returning from the space portion 50 to the return passage 23.

  The cold air discharged into the refrigerator compartment 3 circulates forward along the mounting shelf 13 as shown by an arrow E7 (see FIGS. 1 and 7). Since a plurality of discharge ports 20b are provided in the vertical direction, the stored items at each stage partitioned by the plurality of mounting shelves 13 can be easily cooled. In addition, in the case of a stored item at a stage where the discharge port 20 b is not provided, the stored item is indirectly cooled via the mounting shelf 13 by the cold air flowing along the upper and lower mounting shelves 13.

  The cold air flowing along the mounting shelf 13 descends in front of the mounting shelf 13 as indicated by an arrow E8 (see FIGS. 1 and 7). A part of the cool air descending the front part of the refrigerator compartment 3 circulates on the partition 14 as shown by an arrow E9 (see FIG. 1) and flows into the return passage 23 through the return port 23a on the front side.

  Further, a part of the cold air descending the front part of the refrigerator compartment 3 flows into the vegetable compartment 16 via the communication part 14 a in front of the partition part 14. The cold air that has flowed into the vegetable compartment 16 circulates in the gap 16a around the storage case 15 as shown by an arrow E10 (see FIG. 1). The gap 16 a is also provided on the side of the storage case 15.

  The cool air flowing around the storage case 15 flows above the partition 14 via the rear opening 14b and flows into the return passage 23 via the return port 23b on the lower surface side. In the storage case 15, the stored items inside are indirectly cooled by the cool air (E 9) that flows along the partition 14 that closes the upper surface and the cool air (E 10) that flows through the surrounding gap 16 a.

  The cold air that has flowed into the return passage 23 rises as shown by an arrow E11 (see FIGS. 2 and 9). The cold heat of the cold air rising up the return passage 23 is released into the refrigerator compartment 3 through the member 27. The cool air rising in the return passage 23 branches to the first and second branch paths 24 and 25 as indicated by arrows E12 and E13 (see FIGS. 2 and 9). The cold air flowing through the first and second branch passages 24 and 25 flows into the freezer compartment duct 10 through the communication ports 24a and 25a and returns to the cooler 5.

  Since the cool air is returned to the cooler 5 through the communication ports 24a and 25a provided on the left and right, the amount of cool air returning to the cooler 5 can be adjusted by appropriately forming the opening areas of the communication ports 24a and 25a. Thereby, the state with the frost of the cooler 5 can be adjusted easily, and frost can be made to adhere uniformly in the left-right direction.

  Accordingly, the efficiency of defrosting can be improved, and power saving can be achieved by shortening the defrosting time. This effect is particularly great when the width of the cooler 5 in the left-right direction is large. For this reason, when the width in the left-right direction of the cooler 5 is increased, the heat exchange amount of the cooler 5 is increased, and the cooling efficiency is improved, and the power consumption during defrosting can be suppressed.

  According to the present embodiment, the discharge passage 20 that discharges cold air and the return passage 23 that returns the cold air to the cooler 5 are arranged in parallel on the back surface, which is the same wall surface of the refrigerator compartment 3, so There is no need to provide a return passage in the partition wall 4, and the thickness of the partition wall 4 can be reduced. Therefore, the volumetric efficiency of the refrigerator 1 can be improved.

  In particular, since the partition wall 4 is adjacent to the low-temperature freezer compartment 2, if a return passage is provided in the partition wall 4, moisture in the cold air is likely to freeze, but since the return passage 23 is provided on the back surface, freezing can be easily prevented. . Further, since the cooler 5 is arranged on the back surface of the freezer compartment 2, the cool air is easily guided from the cooler 5 to the discharge passage 20 on the back surface, and the cool air is easily guided to the cooler 5 from the return passage 23 on the back surface. Therefore, it is possible to reduce the pressure loss of the path through which the cold air flows. The discharge passage 20 and the return passage 23 may be provided side by side on the side wall surface of the storage chamber.

  Further, the cold heat of the cold air flowing through the discharge passage 20 and the return passage 23 is transmitted to the member 27 made of a good heat conductor through the front wall 26 a of the duct 26, and the small amount of cold air flowing through the space 50 is directly received by the member 27. To be told. Thereby, cold heat is released from a wide range of the back surface of the refrigerator compartment 3 through the member 27, and the inside of the refrigerator compartment 3 can be uniformly cooled to improve the cooling efficiency.

  In addition, the amount of heat transferred to the member 27 can be optimized by adjusting the area of the front wall 26 a of the discharge passage 20 facing the member 27 and the area of the space 50 facing the member 27. Therefore, it is possible to cool the refrigerator compartment 3 by preventing condensation due to the member 27 being too cold. Note that one of the discharge passage 20 and the return passage 23 may be covered by the member 27. Further, the space 50 may be formed in communication with the return passage 23.

  Further, the recess 26f is formed by notching both sides of the duct 26, and the opening 26g forming the discharge port 20b (first discharge port) faces the recess 26f to form the space 50. It is possible to easily realize the space portion 50 through which is guided.

  In addition, since a discharge port (second discharge port) for discharging cold air from the space 50 to the refrigerating chamber 3 is formed by the gap between the member 27 and the side wall of the groove 36 a, the surface of the member 27 is cooled by the cooler 5. Dry and cool air comes into contact. Thereby, while the temperature of the front and back of the member 27 which contacts the space part 50 becomes substantially equal, dew condensation on the member 27 surface can be prevented.

  Further, the member 27 may extend to the periphery of the discharge passage 20 and the return passage 23 so as to cover the back surface of the refrigerator compartment 3. Thereby, cold heat can be discharged into the refrigerator compartment 3 from a wider range on the back of the refrigerator compartment 3. Therefore, the temperature of the refrigerator compartment 3 can be made more uniform.

  Moreover, since the front wall 26a of the duct 26 is formed of a heat insulating material, condensation due to local overcooling of the member 27 can be prevented.

  In addition, since the member 27 extends to the periphery of the discharge passage 20 and the return passage 23 to cover the back surface of the refrigerator compartment 3, cold heat can be released into the refrigerator compartment 3 from a wider range of the back surface of the refrigerator compartment 3. Therefore, the temperature of the refrigerator compartment 3 can be made more uniform.

  In the present embodiment, it is more desirable to partition the return ports 23a and 23b and the discharge port 20b by the mounting shelf 13. Thereby, the short circuit of the cool air discharged from the discharge port 20b can be prevented more reliably. Therefore, the cooling efficiency can be further improved and the temperature in the refrigerator compartment 3 can be made more uniform. Thereby, even if the discharge passage 20 and the return passage 23 are provided on the rear surface, the thickness of the partition wall 4 is reduced, and the volume of the refrigerator compartment 3 is increased, the refrigerator 1 with good cooling efficiency can be obtained.

  ADVANTAGE OF THE INVENTION According to this invention, it can utilize for the refrigerator which has the discharge channel which discharges cold air, and the return channel | path which returns cold air to a cooler.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Freezing room 3 Refrigerating room 4 Partition wall 5 Cooler 6 Blower fan 7 Communication path 8, 20 Discharge path 8a, 20b, 20c Discharge port 9, 23 Return path 9a, 23a, 23b Return port 10 Freezer chamber duct 11 Drain pan DESCRIPTION OF SYMBOLS 12 Drain pipe 13 Mounting shelf 14 Partition 14b Opening 15 Storage case 16 Vegetable room 17 Damper 18 Low temperature case 21 Left passage 22 Right passage 24 First branch passage 25 Second branch passage 26 Duct 26a Front wall 26f Concave 26g Opening portion 27 Member 30 Lamp 31 Lamp Cover 36 Panel 36a Groove 36c Communication Port 34 Receiving Member 35 Heat Insulation Box 50 Space

Claims (4)

A storage chamber that cools and stores the stored material, a cooler that generates cool air, and a cool air that is disposed on the back of the storage chamber and that is generated by the cooler flows into the storage chamber through the first discharge port. A discharge passage for discharging cold air, and a return passage arranged in parallel with the discharge passage on the back surface of the storage chamber and returning the cold air to the cooler via a plurality of return ports through which the cold air flows out from the storage chamber A member made of a plate-like thermal conductor covering the front wall made of a heat insulating material of the discharge passage or the return passage, an isolation chamber isolated by a partition portion and provided at a lower portion of the storage chamber, and the partition portion And a storage case disposed in the isolation chamber with a gap around the upper surface, the upper and lower sides of the partition communicate with each other at the front of the storage chamber, and the flow of cold air to the return port A part of the road is located in front of the lower part of the storage case. And,
The lower end of the member is disposed above the storage case, and the return port is disposed below the member and between both side ends of the member.
The refrigerator, wherein the one return port allows cool air above the storage case to flow into the return passage, and the other return port allows cool air below the storage case to flow into the return passage . The discharge passage is disposed on both sides of the return passage to provide a duct that integrally forms the return passage and the front wall of the discharge passage, and a recess that is cut off on both sides of the duct and covered with the member. The opening that forms the first discharge port is opened on both side surfaces of the duct, the opening faces the recess, and the cold air flowing in from the discharge passage flows in direct contact with the back end of the member. The refrigerator according to claim 1, wherein a space is formed in the recess. The refrigerator according to claim 2 , wherein a second discharge port that discharges cold air from the space portion to the storage chamber is provided. The refrigerator according to any one of claims 1 to 3 , wherein the member extends to the periphery of the discharge passage and the return passage to cover the back surface of the storage chamber.

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