JP2005345062A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of being effectively cooled by an inexpensive cooling unit, and sufficiently cooling a low-temperature chamber mounted at a lower part of a refrigeration chamber and having a set temperature lower than the refrigeration chamber. <P>SOLUTION: The refrigeration chamber 6 is provided with the flat cooling unit 25, a cooling fan 26, a cold air duct 22 partitioned from an inner box 2 of a heat insulating casing constituting the refrigeration chamber by a decorative sheet 21, and the low-temperature chamber 18. The cooling unit 25 is mounted in the cold air duct 22, the decorative sheet 21 has a communication opening 27, and the cold air flows from an upper part to a lower part in the cold air duct 22 and is discharged into the refrigeration chamber and the low-temperature chamber 18. As the cooled cold air is directly discharged to the low-temperature chamber 18 at the lower part of the refrigeration chamber 6, the low temperature chamber can be sufficiently cooled to the set temperature. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator capable of optimally cooling a refrigerator compartment.

  In general, refrigerators refrigerate the cold room cooled by a cooler in the refrigerator to cool the inside of the refrigerator and cool directly in the refrigerator with a cooling wall cooled by the cooler. In the case of the intercooling type, a suction duct and a discharge duct that circulate the air in the warehouse are required separately from the place where the cooler is installed, so the effective internal volume in the refrigerator compartment decreases, while direct cooling In the formula, it was not possible to cope with the rapid rise in the internal temperature when food was added.

  The conventional direct cooling refrigerator has arranged a cooling fan, and compensated for the direct cooling type defect by operating the cooling fan in a timely manner (see, for example, Patent Document 1).

  FIG. 4 shows a conventional refrigerator described in Patent Document 1. As shown in FIG. As shown in FIG. 4, in the refrigerator 1 comprised by the heat insulation box 5 with which the heat insulating material 4 was filled between the inner box 2 and the outer box 3, a refrigerator is the refrigerator compartment 6, the vegetable compartment 7, and the 1st from the top. One freezer compartment 8 and a second freezer compartment 9.

  The refrigerator compartment 6 and the vegetable compartment 7 are arranged with cooling pipes 10 (evaporators) in contact with the upper, lower, left and right wall surfaces constituting the inner box, and the inside is provided with a plurality of cooling wall surfaces cooled by the cooling pipes 10. It is the composition which has.

  A cold air duct 11 is arranged on the inner box wall of the rear wall that is the inside of the refrigerator compartment, and a cooling fan 12 for the refrigerator compartment is arranged above the cold air duct 11. The cold air duct 11 has an air outlet 13 on the upper side and an outlet 14 on the lower side, and can be taken into the cold air duct 11 through a plurality of slit-shaped openings 15 from the front surface.

  According to the refrigerator configured as described above, when the temperature in the refrigerator compartment is stable within the set range, the cooling fan 12 for refrigeration is stopped and the cooling pipe is operated by operating the compressor 16. When the refrigerant flows through the inner wall 10, the wall surface of the inner box is directly cooled, and the upper, lower, left and right, and rear walls become cooling wall surfaces for cooling.

Next, when food is added and the internal temperature rises, the cooling fan 12 for refrigeration is operated, the cold air is circulated through the cold air duct 11 to cool the internal space, and the internal temperature is lowered. After the operation of the cooling fan 12, when the inside of the refrigerator reaches the set temperature, the cooling fan 12 for refrigeration is stopped and the cooling is returned to the cooling wall only.
JP 2000-28257 A

  However, in the configuration as described above, it is necessary to dispose a large number of cooling pipes in the inner box, resulting in a great cost. In addition, there is a problem that a low-temperature chamber having a set temperature lower than that of the refrigerator compartment cannot be installed at the lower part of the refrigerator compartment.

  The present invention solves the above-described problems, and a cooler can be configured with a small number of cooling pipes to be inexpensive. It is another object of the present invention to provide a refrigerator that can sufficiently cool a low temperature room whose set temperature is lower than that of the cold room installed in the lower part of the cold room.

  In order to solve the above-mentioned conventional problems, the refrigerator of the present invention is a cold air duct partitioned by a flat plate cooler, a cooling fan, an inner box of a heat insulating box constituting the refrigerator compartment, and a decorative plate in the refrigerator compartment. And a cold room having a lower set temperature than the cold room at the lower part of the cold room, the cooler is installed in the cold air duct, and the decorative plate is provided with a communication port communicating with the cold room, the cold air The duct opens into the low temperature chamber, the cold air flow in the cold air duct is from top to bottom, and cool air is discharged into the refrigerator compartment and the low temperature chamber.

  As a result, the cool air that cools the inside of the refrigerator is efficiently cooled by the cooler installed in the cooling duct, so that the cooler can be configured with a small number of cooling pipes and can be made inexpensive. Further, the cold air duct can be minimized and the effective internal volume can be increased. Moreover, since the cold air cooled by the cooler can be discharged directly into the low temperature room having a lower set temperature than the cold room installed in the lower part of the cold room, it can be sufficiently cooled to the set temperature.

  Moreover, the refrigerator of this invention reverses only the cool air flow direction in a cool air duct regularly for arbitrary time.

  As a result, the upper part of the refrigerator compartment, which tends to be hot when the cold air flow in the cold air duct is from the top to the bottom, can be preferentially cooled by switching the cold air flow from the bottom to the top. Temperature unevenness can be suppressed.

  In the refrigerator of the present invention, the switching time of the cold air flow direction in the cold air duct is set so that the time for flowing from top to bottom is long.

  As a result, a low-temperature chamber having a lower set temperature than the cold room installed at the lower part of the cold room can be preferentially cooled, and the set temperature can be reliably ensured even when the amount of cooling load such as loading of food is increased. .

  Further, in the refrigerator of the present invention, the area of the communication port provided in the decorative board is smaller as the distance from the cooling fan is closer.

  As a result, the amount of cold air discharged from the communication port provided in the decorative plate can be made uniform, and temperature unevenness in the refrigerator compartment can be further suppressed.

  In the refrigerator of the present invention, the cold air ventilation cross-sectional area of the cold air duct is larger between the cooler and the inner box than between the cooler and the decorative plate.

  As a result, it is possible to increase the total circulating cold air amount without flowing the amount of cold air discharged from the communication port provided in the decorative plate more than necessary, and cooling load such as feeding food without problems such as food freezing. Even when the amount increases, the cooling amount of the refrigerator compartment can be secured.

  The refrigerator of this invention can make the cooler of a refrigerator compartment cheap. Furthermore, the effective internal volume can be increased. Furthermore, the low temperature room which set temperature lower than the refrigerator room installed in the lower part of a refrigerator room can fully be cooled to preset temperature.

  Moreover, the refrigerator of this invention can suppress the temperature nonuniformity of a refrigerator compartment.

  In addition, the refrigerator of the present invention can secure the cooling amount of the refrigerator compartment even when the cooling load amount such as feeding food without problems such as freezing of food increases.

  According to the first aspect of the present invention, there is provided a flat refrigerator in the refrigerator compartment, a cooling fan, an inner box of a heat insulation box constituting the refrigerator compartment, a cold air duct partitioned by a decorative plate, and a refrigerator in the lower part of the refrigerator compartment. A cold room having a set temperature lower than that of the room, the cooler is installed in the cold air duct, the decorative plate is provided with a communication port communicating with the cold room, and the cold air duct opens into the cold room. The cool air flow in the cool air duct is from top to bottom, and the cool air that cools the refrigerator is efficiently cooled by a cooler installed in the cool duct by discharging cool air into the cold room and the low temperature room. The cooler can be configured with a small number of cooling pipes, and the cost can be reduced. Further, the cold air duct can be minimized and the effective internal volume can be increased. Moreover, since the cold air cooled by the cooler can be discharged directly into the low temperature room having a lower set temperature than the cold room installed in the lower part of the cold room, it can be sufficiently cooled to the set temperature.

  The invention according to claim 2 is the invention according to claim 1, wherein the flow direction of the cold air in the cold air duct is periodically reversed only for an arbitrary time so that the cold air flow in the cold air duct is from the top to the bottom. By switching the cold air flow from the bottom to the top in the upper part of the refrigerating room where the temperature tends to be high, the upper part of the refrigerating room can be preferentially cooled, and temperature unevenness in the refrigerating room can be suppressed.

  According to a third aspect of the present invention, in the second aspect of the present invention, the switching time of the direction of the cold air flow in the cold air duct is set at the lower part of the cold room by setting a longer time to flow from top to bottom. It is possible to preferentially cool a low temperature room whose set temperature is lower than that of the room, and it is possible to ensure the set temperature even when the amount of cooling load such as food is increased.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the area of the communication port provided in the decorative plate is made smaller as the distance from the cooling fan is shorter, so The amount of cold air discharged from the communication port provided in the plate can be made uniform, and temperature unevenness in the refrigerator compartment can be further suppressed.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the cold air cross-sectional area of the cold air duct is larger between the cooler and the inner box than between the cooler and the decorative plate. By doing so, the amount of cool air discharged from the communication port provided on the decorative board can be increased without flowing more than necessary, and the total circulating cold air amount can be increased. Even when the load amount increases, the cooling amount of the refrigerator compartment can be secured.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a longitudinal sectional view of a refrigerator in Embodiment 1 of the present invention. FIG. 2 shows a refrigeration cycle diagram of the refrigerator in the first embodiment of the present invention. FIG. 3 shows a flowchart of cooling in the refrigerator compartment in the first embodiment of the present invention. In addition, about the same structure as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  In FIG. 1, the refrigerator 17 is constituted by a heat insulating box 5 in which a heat insulating material 4 is filled between an inner box 2 and an outer box 3. The refrigerator 17 has a cold room 6 from the top, a low temperature room 18 having a set temperature lower than that of the cold room, a first freezer room 8 and a second freezer room 9 at the lower part of the cold room 6. The second freezer compartment 9 is partitioned by a freezer partition plate 19, and the refrigerator compartment 6 and the first freezer compartment 8 are partitioned by a heat insulating partition wall 20 having the same configuration as the heat insulating box 9.

  The refrigerator compartment 6 is provided with a cool air duct 22 partitioned by a rear wall surface of the inner box 2 and a decorative plate 21, and a cool plate 25 made up of a cooling pipe 23 and a flat plate 24 contains cold air on both sides. It is arranged so that the distance A between the cooling plate 25 and the inner box 2 is larger than the distance B between the cooling plate 25 and the decorative plate 21. In addition, a cooling fan 26 and a suction port 28 are arranged in the upper part, and a discharge port 29 is opened in the low temperature chamber 18 whose set temperature is lower than that in the refrigeration room below the refrigeration room 6. The decorative plate 21 is also provided with a communication port 27 that has a plurality of opening areas communicating with the inside of the cold air duct 22 and the refrigerator compartment 6 that are made smaller as the distance from the cooling fan 26 is closer (upward of the decorative plate). A cooling fan 30 and an evaporator 31 are arranged in the second freezer compartment 9.

  FIG. 2 shows a refrigeration cycle. The refrigerant discharged from the compressor 16 passes through the condenser 32 and the three-way valve 33 as shown by the solid line, and then is decompressed by the capillary tube 34 and enters the evaporator 31. A first refrigeration cycle returning to the compressor 16 is configured again via the refrigerant tank 35. Further, the refrigerant discharged from the compressor 16 passes through the condenser 32 as indicated by the dotted line, the refrigerant flow path is switched by the three-way valve 33, the pressure is reduced by the capillary tube 36 as indicated by the dotted line, and the refrigerant is supplied to the cooling plate 25. A second refrigeration cycle that enters and returns to the compressor 16 via the refrigerant tank 37 is configured.

  About the refrigerator comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  Due to the operation of the compressor 16, the refrigerant flows through the cooling plate 25 or the evaporator 31, thereby cooling the inside of the warehouse. That is, on the freezer compartment 8 and 9 side, the cold air cooled by the evaporator 31 is circulated in the warehouse by the freezing cooling fan 30 and the freezer compartments 8 and 9 are cooled.

  On the other hand, on the refrigerator compartment 6 side, the cool air efficiently cooled on both surfaces of the cooling plate 25 is discharged from the discharge port 29 and the communication port 27 in the back surface portion of the low temperature chamber 18, so that the entire refrigerator compartment is Cooling.

  As described above, in the present embodiment, the cool air cooled by the cooling plate 25 is discharged directly to the low temperature chamber 18 having a lower set temperature than the refrigerating room installed in the lower part of the refrigerating room 6 and sufficiently cooled to the set temperature. it can. Further, since the cool air can be efficiently cooled, the cooling plate 25 can be configured with a small number of cooling pipes at low cost. Further, the cold air duct 22 can be minimized and the effective internal volume of the refrigerator compartment can be increased.

  In the present embodiment, the three-way valve 33 is switched to the refrigeration side (dotted line) (step S1), and at the same time (step S2), the cooling fan 26 is operated in a normal rotation (step S3), and the cold air duct 22 is operated. The cooling fan 26 is operated in the reverse rotation after an arbitrary time (step S4), and the cooling air flow in the cooling air duct 22 is allowed to flow from the bottom to the top (FIG. 1 shows a cooling air flow diagram). By repeating the above, the upper part of the refrigerator compartment, which tends to have a high temperature when the cold air flow in the cold air duct is from the top to the bottom, is preferentially switched by switching the cold air flow from the bottom to the top. The temperature of the refrigerator compartment can be suppressed.

  In the present embodiment, by setting the forward rotation time of the cooling fan 26 to be longer than the reverse rotation time, the cold room 18 having a lower set temperature than the cold room installed in the lower part of the cold room 6 can be preferentially cooled. Even when the amount of cooling load such as food is increased, the set temperature can be reliably ensured.

  In the present embodiment, the cold air flow in the cold air duct 22 is switched by reversing the rotation of the cooling fan 26. However, if the air path can be switched, such as an air path switching damper, Become.

  Further, in the present embodiment, the opening area of the communication port 27 is made smaller as the distance from the cooling fan 26 is shorter (as the upper part of the decorative plate), so that the discharge cold air from the communication port 27 provided in the decorative plate 21 is particularly small. The amount can be made uniform, and temperature unevenness in the refrigerator can be further suppressed.

  Further, in the present embodiment, the cold air ventilation cross-sectional area of the cold air duct 22 is larger between the cooling plate 25 and the inner box 2 than between the cooling plate 25 and the decorative plate 21. Refrigerating room 6 can also increase the total circulating cold air amount without flowing the amount of cold air discharged from 27 more than necessary, and when the amount of cooling load increases such as feeding food without problems such as food freezing. The amount of cooling can be secured.

  As described above, the refrigerator according to the present invention can cool a low temperature room having a lower set temperature than the refrigerating room and the refrigerating room installed at the lower part of the refrigerating room with an inexpensive cooler sufficiently to the set temperature without temperature unevenness. It can also be applied as a cooling method for refrigeration equipment in general.

The longitudinal cross-sectional view of the refrigerator in Embodiment 1 of the refrigerator by this invention Refrigeration cycle diagram of refrigerator in Embodiment 1 of the refrigerator according to the present invention Flowchart of refrigerator refrigerator cooling in Embodiment 1 of the refrigerator according to the present invention Vertical section of a conventional refrigerator

Explanation of symbols

2 Inner box 18 Low greenhouse 21 Decorative plate 22 Cooling duct 25 Cooling plate 26 Cooling fan 27 Communication port

Claims (5)

  The refrigerator has a flat plate cooler, a cooling fan, an inner box of a heat insulating box constituting the refrigerator compartment, a cool air duct partitioned by a decorative plate, and a low temperature lower than the refrigerator compartment at the lower part of the refrigerator compartment. The cooler is installed in the cold air duct, the decorative plate is provided with a communication port communicating with the cold room, the cold air duct opens into the cold room, and the cold air flow in the cold air duct is A refrigerator characterized in that cold air is discharged from the top to the bottom and into the cold room and the low temperature room.   The refrigerator according to claim 1, wherein the direction of the cold air flow in the cold air duct is periodically reversed only for an arbitrary time.   The refrigerator according to claim 2, wherein the switching time of the direction of the cold air flow in the cold air duct is set to a longer time to flow from the top to the bottom.   The refrigerator according to any one of claims 1 to 3, wherein an area of the communication opening provided in the decorative plate is reduced as the distance from the cooling fan is shorter.   The refrigerator according to any one of claims 1 to 4, wherein the cold air ventilation cross-sectional area of the cold air duct is larger between the cooler and the inner box than between the cooler and the decorative plate.

Images