JP2007120924A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of quickly performing defrosting without lowering an inside humidity. <P>SOLUTION: This refrigerator has an evaporator 13 for cooling a refrigerating section constituting a freezing cycle by a compressor 23, a condenser 25 and throttle devices 19, 21, a fan 29 for circulating cold air, an evaporator 15 for cooling a freezing section and a fan 39 for cooling cold air, and further has a heater 35 for heating the returned cold air in a dust 33 through which a part or the whole of the returned cold air returning to the evaporator 13 for cooling the refrigerating section passes, so that the defrosting is performed by the returned cold air having high heat quantity. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a refrigerator.

  Generally, a refrigerator includes a refrigerator for a refrigerator compartment that cools a refrigerator compartment and a vegetable compartment, and an evaporator for a refrigerator compartment that cools a freezer compartment exclusively.

The frost adhered to the freezer evaporator during operation is defrosted by a heating means such as a heater when the evaporator is in the operation stop mode. On the other hand, frost adhering to the evaporator for the refrigerator compartment is returned by repeating the circulation in which the return cold air that has passed through the interior of the refrigerator by operating the fan is passed through the evaporator for the refrigerator compartment in the cooling operation stop mode of the evaporator. Defrosting is performed by the heat held by the cold air.
JP 2002-303474 A

  The defrosting of the refrigerator evaporator is performed by circulating the cool air returning to the inside of the refrigerator. For the reason, for example, when the frost attached to the refrigerator evaporator is directly defrosted by a heating means such as a heater, the frost is melted. This is because the steam at the time is discharged to the outside along with water along the water, resulting in a problem that the humidity inside the cabinet is lowered.

  In general, vegetable rooms require high humidity, and in the case of defrosting with the return cold air circulation type, the melted steam returns to the inside of the cabinet again, so that the humidity cannot be reduced and defrosting can be performed. However, if the temperature of the return cold air is low, it takes time to defrost. In particular, in winter, the outside air temperature is low and the internal temperature tends to be low, and it takes time to defrost by the return cold air.

  Then, in this invention, it aims at providing the new refrigerator which completes defrosting rapidly, without reducing the humidity in a store | warehouse | chamber.

  In order to achieve the above object, in the present invention, a refrigeration compartment cooling evaporator that constitutes a refrigeration cycle with a compressor, a condenser, and a throttle device, a cooling air circulation fan thereof, and a refrigeration compartment cooling evaporator And a cooling air circulation fan, and a heater for heating the return cold air is provided in a duct through which a part or all of the return cold air returning to the refrigeration compartment cooling evaporator passes.

  According to the present invention, for example, a part of the return cold air returning to the evaporator for cooling the refrigerated compartment can be heated by the heater, and the temperature of the return cold air can be increased. Frost can be removed quickly. Since the steam and moisture melted at the time of defrosting are repeatedly circulated toward the interior, the defrosting can be performed without lowering the humidity in the interior.

  In the present invention, first, the duct provided with the heater is arranged along the front surface inside the refrigerator of the refrigeration compartment cooling evaporator, thereby heating the return cold air flowing in the duct during the defrosting operation. In addition, the heater heat from the heater is directly applied to the refrigerated compartment cooling evaporator via the duct.

  Secondly, by positioning the heater provided in the duct within a region of 2/3 or less from the upstream side of the evaporator for cooling the refrigeration compartment, it becomes possible to heat from the upstream side to the downstream side. Ensure good heater heating.

  Third, by providing a pipe temperature detection sensor for detecting the completion of defrosting in the upper pipe of the refrigeration compartment cooling evaporator, the evaporator can be detected by detecting the temperature of the upper pipe on the downstream side where defrosting is most delayed. Make sure that the entire defrost is complete.

  Fourth, by providing a heater for heating the return cold air along the duct surface inside the duct, the heater approaches the interior of the duct. For example, for temperature compensation that warms the interior of the subcooled compartment It can be used as a heater.

  Fifth, by providing a heater for heating the return cold along the evaporator-side duct surface of the duct, the heater approaches the evaporator for cooling the refrigeration compartment, so that the combination of return cool air heating and direct conduction heater heating is used. Allow defrosting to be completed quickly.

  Sixth, by arranging the evaporator for the freezing compartment on the back of the evaporator for cooling the refrigerated compartment provided in the interior of the vegetable compartment, the storage capacity of the freezer compartment is increased. Even if the refrigeration compartment cooling evaporator is strongly influenced by the cold air of the freezer compartment cooling evaporator, the return cold air having a large amount of heat heated by the heater is secured.

  Hereinafter, embodiments of the present invention will be specifically described with reference to FIGS. 1 to 7.

  FIG. 1 shows a schematic cut side view of a refrigerator according to the present invention.

  The refrigerator 1 includes a refrigerator room 3, an ice making room 5 and a switching room 7, a vegetable room 9, and a freezer room 11 arranged in parallel from the top.

  The freezer compartment 11, the vegetable compartment 9, the ice making compartment 5, and the switching compartment 7 are cooled by the refrigerator for cooling compartment cooling 13, and the freezing compartment 11 is cooled by the evaporator 15 for cooling freezing compartment respectively.

  As shown in FIG. 4, the refrigeration compartment cooling evaporator 13 and the refrigeration compartment cooling evaporator 15 are arranged in parallel via the three-way valve 17 and the expansion devices 19 and 21, and the compressor 23 and the condenser 25. It constitutes the refrigeration cycle. The evaporator 13 for refrigerated compartment cooling is disposed in the interior of the vegetable compartment 9 (right side in FIG. 1), and has a pipe temperature detection sensor 27 for detecting the completion of defrosting in the upper pipe on the downstream side, while circulating cold air. A cooling air circulation fan 29 is provided.

  The cold air exchanged by the evaporator 13 for refrigerating compartment cooling is stored in the refrigerating chamber via a cold air passage 31 provided with a damper (not shown) for controlling the intake of cooling air by the operation of the cooling air circulation fan 29. 3. The ice making chamber 5 and the switching chamber 7 (the passage is not shown) and the vegetable chamber 9 are sent to each other, and after cooling inside the cabinet, the process returns to the evaporator 13 for cooling the refrigerated compartment.

  At this time, as shown in FIG. 2, the return cold air that has passed through the vegetable compartment 9 repeats circulation to return to the refrigerated compartment cooling evaporator 13 via the duct 33.

  The duct 33 through which the return cold air passes is composed of a front-side inner duct surface 33a, a rear-side evaporator-side duct 33b, and left and right duct surfaces 33c. Are arranged along. A heater 35 for heating the return cold air is provided inside the duct 33.

  The heater 35 serves as means for heating the return cold air from the vegetable compartment 9, and is provided on the inner wall of the inner duct surface 33 a of the duct 33 as an arrangement place.

  As a result, the return cold air flowing into the duct 33 from the intake port 77 of the duct 33 is heated by the heater 35, and then the flow toward the refrigerated compartment cooling evaporator 13 is secured.

  In this case, it is also possible to provide a combination type in which the heaters 35 are provided inside and outside the inside duct 33b to heat all.

  Further, as a place where the heater 35 is provided outside, it is also possible to provide it on the inner wall of the evaporator-side duct surface 33b as shown in FIG. In the case of this embodiment, it is desirable that the heater 35 be installed in an area of 2/3 or less, which is upstream of the refrigeration compartment cooling evaporator 13.

  As a result, the heater 35 becomes a combined heating means for directly heating the refrigerated compartment cooling evaporator 13 by its heat conduction through the duct 33 in addition to heating the return cold air, so that quick defrosting can be performed. Become. At this time, since direct heating by the heater 35 is from the upstream side below the evaporator, efficient heating can be performed.

  On the other hand, a refrigeration compartment cooling evaporator 15 is disposed on the back of the refrigeration compartment cooling evaporator 13, and the cold air heat exchanged in the freezer compartment cooling evaporator 15 by the cold air circulation fan 39 passes through the freezer compartment 11. After passing, the circulation returning to the refrigeration compartment cooling evaporator 15 is repeated.

  Therefore, since the installation space for the freezing compartment cooling evaporator 15 is not required in the back of the freezer compartment 11, the freezer compartment volume can be increased accordingly.

  On the other hand, a temperature compensation heater 43 is provided in the vegetable compartment 9 that is strongly influenced by the cold air of the freezer compartment cooling evaporator 15 to warm the vegetable compartment 9 by the temperature sensor 41 when the inside temperature becomes below a specified value.

  According to the refrigerator 1 configured as described above, in order to perform defrosting, the cold-air circulation fan 29 is operated with the refrigeration section cooling evaporator 13 in the operation stop mode.

  Thus, the return cold air that has passed through the final vegetable compartment 9 returns to the refrigerated compartment cooling evaporator 13 through the duct 33 and repeats the operation of circulating again.

  During this circulation, the returned cold air is heated by the heater 35 as it passes through the duct 33. At the same time, since the inside of the vegetable compartment 9 is heated by the heat conduction of the heater heat by the heater 35, the vegetable compartment 9 does not reach below the specified temperature even if it is affected by the cold air of the evaporator 15 for cooling the freezing compartment, The operation stop time of the temperature compensation heater 43 can be extended, which is very preferable in terms of running cost.

  On the other hand, the refrigeration compartment cooling evaporator 13 is defrosted by circulation of return cold air in which heat energy is stored. At the same time, defrosting is quickly performed by the combination of the heat conduction of the heater heat through the duct 33 on the front surface. As a result, the defrosting proceeds sequentially from the upstream side below the evaporator to the upstream downstream, and the defrosting is completed by the detection by the upper pipe temperature detection sensor 27. At this time, since the pipe temperature detection sensor 27 is provided in the upper pipe of the evaporator, it is possible to accurately detect the completion of defrosting.

The outline cutaway view of the refrigerator concerning the present invention. The expansion explanatory drawing of the principal part which implemented this invention in the store | warehouse | chamber interior back side. The outline front view of a refrigerator. Refrigeration cycle diagram. The schematic explanatory drawing which showed the circulation of the cold air which passes through the evaporator for refrigeration division cooling. The schematic explanatory drawing which showed the circulation of the cold air which passes through the evaporator for freezing division cooling. The same explanatory drawing as FIG. 2 which provided the heater provided in a duct in the evaporator side duct surface.

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Refrigerating room 5 Ice making room 7 Switching room 9 Vegetable room 11 Freezer room 13 Evaporator for refrigeration compartment cooling 15 Evaporator for refrigeration compartment cooling 19, 21 Throttle device 23 Compressor 25 Condenser 27 Piping temperature detection sensor 29, 39 Cold air circulation Fan 33 Duct 33a Internal duct surface 33b Evaporator side duct surface for refrigeration compartment cooling 35 Heater

Claims (7)

  The refrigeration compartment cooling evaporator and the cold air circulation fan that constitute the refrigeration cycle with the compressor, the condenser, and the expansion device, the refrigeration compartment cooling evaporator and the cold air circulation fan, and the refrigeration compartment cooling A refrigerator comprising a heater for heating the return cold air in a duct through which a part or all of the return cold air returns to the evaporator.   The refrigerator according to claim 1, wherein the duct provided with the heater is disposed along a front surface inside the refrigerator of the refrigeration compartment cooling evaporator.   The refrigerator according to claim 2, wherein the heater provided in the duct is located in an area of 2/3 or less from the upstream side of the evaporator for cooling a refrigerated section.   The refrigerator according to claim 3, wherein a pipe temperature detection sensor for detecting completion of defrosting is provided in an upper pipe of the evaporator for cooling a refrigerated compartment.   The refrigerator according to claim 2, wherein the heater for heating the return cold air is provided along a duct surface inside the duct.   The refrigerator according to claim 2, wherein the heater for heating the return cold air is provided along an evaporator-side duct surface.   2. The refrigerator according to claim 1, wherein the evaporator for a freezing compartment is disposed on a back surface of an evaporator for cooling a refrigerated compartment provided in the interior of a vegetable compartment.

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