JP4215727B2 - refrigerator - Google Patents

Description

  The present invention relates to a refrigerator provided with a control board storage section for storing a control board in a machine room.

  A conventional refrigerator is disclosed in Patent Document 1. In the refrigerator, a door that opens and closes the front is supported by the main body. The main body includes an insulating box having an outer wall made of a heat insulating material and having an open front surface. A machine room in which a compressor is installed is provided at the lower rear of the main body. A machine room cover is provided on the back of the machine room. The machine room cover is formed so as to protrude into the machine room, and a control board for controlling each part is housed on the outer surface side. As a result, a control board storage unit for storing the control board in the machine room is provided.

When the compressor is driven by the control of the control board, the refrigeration cycle is operated, and cold air is generated by heat exchange with the cooler on the low temperature side of the refrigeration cycle. The storage chamber provided in the heat insulation box is cooled by the cold air.
Japanese Patent Application Laid-Open No. 11-213321 (page 3 to page 5, FIG. 2)

  Table 3 in paragraph 11.8 of the international safety standard IEC60335-1 “Safety of electrical equipment for household and similar use, Part 1: General requirements” specifies that the temperature rise limit value of the outer surface of the capacitor is 20K. Has been. In addition, the international safety standard IEC60335-2-24 “Safety of electrical equipment for household use and similar applications Part 2: Individual requirements for refrigeration-like equipment and ice cream / ice making equipment” includes subtropical (ambient temperature 38 ° C) or tropical The temperature rise limit value of the equipment of the (ambient temperature 43 ° C.) class is specified to be reduced by 7K from the value in Table 3 above. Therefore, in the subtropical or tropical class, the temperature rise of the capacitor mounted on the control board needs to be 13K or less.

  However, according to the conventional refrigerator, the machine room is heated by the compressor on the high temperature side of the refrigeration cycle. For this reason, a margin for the international safety standard of the smoothing and noise preventing capacitors mounted on the control board is reduced, and a refrigerator capable of further improving safety has been demanded. In particular, in a medium-sized refrigerator or less, the machine room is narrow and the temperature rise is so high that the international safety standard is not satisfied, and the control board storage unit cannot be provided in the machine room. On the other hand, when the control board storage portion is provided in the storage chamber, the storage capacity of the stored item is reduced, and heat is radiated from the control board to the storage chamber, thereby increasing power consumption of the refrigerator. For this reason, there was a problem that a control board storage part could not be provided in the storage room, and electronic control could not be performed in a medium-sized or smaller refrigerator.

  An object of the present invention is to provide a refrigerator with high storage capacity while ensuring storage capacity. It is another object of the present invention to provide a medium-sized or smaller refrigerator capable of ensuring storage capacity and satisfying international safety standards.

  In order to achieve the above-mentioned object, the present invention has an insulating box body having an outer wall made of a heat insulating material, having a front surface and an inclined portion inclined on the outer wall at the lower end on the back side, and below the heat insulating box body. A duct that is provided and opens at the front, a machine room that is provided behind the duct facing the inclined part, a compressor that is installed in the machine room and operates a refrigeration cycle, and is provided in the inclined part And a control board storage section for storing the control board.

  According to this structure, a compressor is driven by control of a control board, a refrigeration cycle is drive | operated, and the storage chamber in a heat insulation box is cooled. The outer wall of the heat insulating box is formed of a heat insulating material, and the machine room is isolated from the front storage chamber by an inclined portion inclined at the lower end of the back surface of the outer wall. The air heated by the compressor rises, and outside air flows into the machine room through the lower duct. The control board storage section is cooled by exchanging heat with air before being heated by the compressor through the duct. The temperature of the air raised by the heat generated by the electronic components mounted on the control board rises, and part of the air is exhausted from the machine room and part of it falls. Since the descending air is provided with the control board housing portion in the inclined portion, collision with the air flowing from below through the duct is avoided. As a result, air naturally convects efficiently in the machine room.

  According to the present invention, in the refrigerator configured as described above, the control board storage portion is formed of a box attached to the inclined portion.

  Moreover, the present invention is characterized in that, in the refrigerator having the above-described configuration, the lower end of the control board storage portion protrudes from the lower end of the heat insulating box into the duct. According to this structure, the external air taken in from the duct reliably contacts the control board storage unit.

  Further, according to the present invention, in the refrigerator having the above-described configuration, a capacitor is provided in the control board storage unit, and the capacitor is disposed below the control board storage unit.

  According to the present invention, in the refrigerator having the above-described configuration, a transformer is provided in the control board storage unit, and the transformer is disposed below the control board storage unit.

  According to the present invention, in the refrigerator configured as described above, an evaporating dish for collecting and evaporating drain water is provided above the compressor and the control board storage unit. According to this configuration, the drain water stored in the evaporating dish by defrosting or the like is accelerated by the heat radiation of the compressor and the control board.

  According to the present invention, since the duct is provided below the heat insulation box and the control board storage section is provided at the inclined portion at the lower end of the heat insulation box, the control board storage section is heated by the compressor through the duct. Heat is exchanged with the air before cooling. Further, collision between the air that rises and descends in the control board housing portion and the air that flows in from below through the duct is avoided, and air naturally convects efficiently in the machine room. Thereby, the control board built in the control board storage part can be efficiently cooled. Therefore, a highly safe refrigerator can be provided. In addition, it is possible to provide a medium-sized or smaller refrigerator that can satisfy the international safety standard without reducing the storage capacity of stored items.

  Further, according to the present invention, since the control board storage part is formed of a box attached to the inclined part, the control board storage part can be easily provided in the inclined part.

  According to the present invention, since the lower end of the control board storage part protrudes into the duct from the lower end of the heat insulating box, the outside air taken in from the duct reliably contacts the control board storage part, and the control board storage part is more It can be cooled efficiently.

  Further, according to the present invention, since the capacitor and the transformer are arranged at the lower part of the control board housing part, the capacitor and the transformer are arranged away from the air rising due to the heat radiation of the compressor to further suppress the temperature rise of the capacitor and the transformer. Can do.

  Further, according to the present invention, since the evaporating dish is provided above the compressor and the control board storage unit, the area of the evaporating dish can be increased, and drain water can be quickly evaporated to prevent overflow.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a front view and a side sectional view showing a refrigerator according to an embodiment. The refrigerator 1 is provided with a heat insulating box 4 having an outer wall formed of a heat insulating material on the main body side, and has a refrigerator compartment 2 and a freezer compartment 3 partitioned by a partition wall 5 of the heat insulating box 4. The front surfaces of the refrigerator compartment 2 and the freezer compartment 3 can be opened and closed by doors 6 and 7, respectively.

  A cooler 13 and a blower 14 are provided at the rear of the freezer compartment 3 arranged in the upper stage. Below the refrigerating chamber 2, a duct 9 having an open front is provided. The lower end of the back surface of the heat insulating box 4 is formed with an inclined portion 8 whose outer wall is inclined. A machine room 15 communicating with the duct 9 is provided behind the refrigerator compartment 2 via the inclined portion 8.

  The machine room 15 is provided with a compressor 10 that operates a refrigeration cycle. Above the compressor 10 is provided an evaporating dish 11 that accumulates and evaporates drain water during defrosting. A control board storage unit 12 is provided in front of the compressor 10. The control board storage unit 12 is composed of a box attached to the inclined part 8, and stores a control board 17 (see FIG. 5) for controlling each part. In addition, an exhaust port 16 is provided at the upper back of the machine room 15.

  FIG. 3 shows a plan view of the machine room. The evaporating dish 11 is provided close to the inclined part 8 (see FIG. 2), and the compressor 10 and the control board storage part 12 are arranged below the evaporating dish 11. Thereby, the area of the evaporating dish 11 is ensured widely, drain water can be evaporated quickly, and overflow can be prevented. The evaporating dish 11 can be pulled out from the back for cleaning.

  FIG. 4 shows a schematic circuit diagram of the refrigerator. The power supply 18 is connected to the compressor 10, the blower 14, and the control board 17 in parallel. The control board 17 controls opening and closing of a switch 19 disposed between the compressor 10 and the blower 14 and the power source 18.

  In the refrigerator 1 having the above configuration, when the switch 19 is turned on under the control of the control board 17, the compressor 10 and the blower 14 are driven. The refrigeration cycle is operated by driving the compressor 10, and the air flowing in the cold air passage (not shown) exchanges heat with the cooler 13 on the low temperature side of the refrigeration cycle to generate cold air. The blower 14 discharges the cold air to the freezer compartment 3 and the refrigerator compartment 2, and cools the interiors of the freezer compartment 3 and the refrigerator compartment 2.

  FIG. 5 is a side sectional view showing details of the machine room 15. The control board storage portion 12 provided in the inclined portion 8 is arranged to protrude into the duct 9 from the lower end of the heat insulating box 4. The air heated by the drive of the compressor 10 (see FIG. 2) rises and is exhausted from the exhaust port 16 (see FIG. 2). As a result, low temperature outside air flows from the duct 9 into the machine chamber 15 as indicated by an arrow A.

  Prior to heat exchange with the compressor 10, the outside air that has flowed into the machine room 15 contacts the control board storage unit 12 disposed in front of the compressor 10 and exchanges heat. Further, part of the air that rises through heat exchange with the control board 17 is exhausted from the exhaust port 16 (see FIG. 2), and part of the air descends as shown by an arrow B. At this time, since the control board storage unit 12 is disposed to be inclined, the air naturally convects efficiently in the machine chamber 15 while avoiding a collision between the descending air and the ascending air.

  Thereby, the control board 17 built in the control board storage part 12 can be cooled efficiently. Therefore, the highly safe refrigerator 1 can be provided. Moreover, the refrigerator 1 which can satisfy an international safety standard can be provided, without reducing the storage capacity of a stored item even if it is medium size or less.

  Moreover, since the lower part of the control board storage part 12 protrudes in the duct 9, the control board storage part 12 can be reliably made to contact external air. A capacitor 21 and a transformer 22 are mounted on the lower part of the control board 17 disposed in the control board storage unit 12. Since the lower part of the control board storage part 12 protrudes in the duct 9, the capacitor | condenser 21 and the transformer 22 which are heat generating bodies can fully be cooled. Further, the capacitor 21 and the transformer 22 can be arranged away from the air rising due to the heat radiation of the compressor 10 to further suppress the temperature rise of the capacitor 21 and the transformer 22. The capacitor 21 and the transformer 22 may be provided separately from the control board 17.

  According to this invention, it can utilize for the refrigerator provided with the control board which controls each part.

The front view which shows the refrigerator of embodiment of this invention Side surface sectional drawing which shows the refrigerator of embodiment of this invention The top view which shows the machine room of the refrigerator of embodiment of this invention Schematic circuit diagram of the refrigerator of the embodiment of the present invention Side surface sectional drawing which shows the machine room of the refrigerator of embodiment of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigeration room 3 Freezing room 4 Heat insulation box 8 Inclination part 9 Duct 10 Compressor 11 Evaporating dish 12 Control board storage part 13 Cooler 14 Blower 15 Machine room 16 Exhaust port 17 Control board 21 Capacitor 22 Transformer

Claims (6)

  A heat insulating box having an outer wall made of a heat insulating material and opening the front surface and having an inclined portion inclined the outer wall at the lower end on the back side; a duct provided below the heat insulating box and opening the front surface; and A machine room that is provided behind the duct facing the inclined part, a compressor that is installed in the machine room and operates a refrigeration cycle, and a control board storage part that is provided in the inclined part and stores a control board A refrigerator characterized by comprising.   The refrigerator according to claim 1, wherein the control board storage part is formed of a box attached to the inclined part.   The refrigerator according to claim 1 or 2, wherein a lower end of the control board storage part protrudes into the duct from a lower end of the heat insulating box.   The refrigerator according to any one of claims 1 to 3, wherein a capacitor is provided in the control board storage unit, and the capacitor is disposed below the control board storage unit.   The refrigerator according to any one of claims 1 to 4, wherein a transformer is provided in the control board storage unit, and the transformer is disposed below the control board storage unit.   The refrigerator according to any one of claims 1 to 5, wherein an evaporating dish for collecting and evaporating drain water is provided above the compressor and the control board storage unit.

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