JP2009079857A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator without impairing luminance of an LED, by preventing melting of a solder part by restraining a high temperature rise in a lighting system, as a compact lighting system, even when using a high intensity LED as an illuminator in a storage chamber. <P>SOLUTION: This refrigerator is composed of the storage chamber 5 formed in a thermal insulation casing, a door 8 openably-closably blocking up a front opening part of this storage chamber, a fan 11 driven when blocking up this door and supplying cold air generated by a cooler 9 in the storage chamber, a duct 13 arranged in a ceiling part of the storage chamber and flowing the cold air, the lighting system 15 in a storage by the LED 20 arranged so as to exchange heat with the cold air flowing in this duct, and a shade 21 covering the indoor side of this lighting system, and is characterized in that the cold air is made to flow in the duct by driving the fan by turning on the lighting system when opening the door. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator provided with a lighting device in a storage room using semiconductor light emitting elements.

  In recent years, high-brightness type LEDs, which are semiconductor light-emitting elements, have been developed and put into practical use. However, when used as an interior lighting device of a refrigerator, the LED solder part generates heat when the LEDs are lit because the input is large. There is a problem that the solder chip of the board melts due to the temperature rise, and in order to suppress the temperature, the area of the board on which the LED is mounted is enlarged to increase the heat dissipation performance, or the current consumption of the LED is limited. The configuration was adopted.

In this regard, even when a high-intensity LED is used as an illuminating body in the storage room, the temperature rise due to heat generation is prevented by reducing the input to the lighting device according to the opening time when the storage room door is opened. The configuration described above is described in Patent Document 1.
JP 2006-292221 A

  However, as described above, increasing the area of the substrate not only increases the cost of the substrate, but also reduces the space efficiency in the storage chamber, and if the current consumption is limited, the original high-brightness LED Therefore, the brightness held by can not be realized.

  The present invention has been made in consideration of the above points, and even when a high-intensity LED is used as an illuminating body in a storage room, as a compact illuminating device, the temperature of the illuminating device is suppressed and melting of the solder portion is suppressed. An object of the present invention is to provide a refrigerator that prevents the luminance of the LED from being impaired while preventing it.

  In order to solve the above-mentioned problems, a refrigerator according to claim 1 of the present invention is a storage chamber formed in a heat-insulating housing, a door for closing the front opening of the storage chamber so as to be openable and closable, and driving when the door is closed. The fan that supplies the cool air generated by the cooler into the storage chamber, the duct that is disposed in the ceiling of the storage chamber, and the LED that is provided to exchange heat with the cool air that flows in the duct. And when the door is opened, when the door is opened, the lighting device is turned on and the fan is driven so that cool air is circulated through the duct. It is characterized by that.

  According to a third aspect of the present invention, there is provided a refrigerator according to a third aspect of the present invention, wherein a storage room formed in the heat insulating housing, a door that closes the front opening of the storage room so as to be openable and closable, The lighting device in the warehouse by the LED arranged in the section and a shade covering the indoor side of the lighting device, the lighting device has a plate surface made of a good heat conductor on the back surface of the substrate soldered with the LED. And the lighting device to which the substrate is attached is fixed to the ceiling.

  According to the first aspect of the present invention, when the illumination time of the interior lamp by opening the door is longer than a predetermined time, the illumination device can be forcibly cooled by the cold air flow, and the brightness of the LED is impaired. In addition, the interior of the storage room can be brightly illuminated with light from the LED at low cost without increasing the size of the substrate. It is possible to promote heat dissipation of the LED that is energized by the plate surface of the heat conductor, and to suppress the temperature rise of the soldered portion.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. The refrigerator main body (1) which shows the schematic longitudinal cross-sectional view in FIG. 1 consists of the heat insulation box which interposed the heat insulating material (4) between the outer box (2) and the inner box (3), and refrigerated food is on the uppermost part. A refrigeration room (5) for storing and storing food is provided, and a storage room according to a predetermined storage temperature, such as a vegetable room (6) and a freezer room (7), is arranged at the lower part of the refrigeration room (5). A door (8) that can be opened and closed by a hinge provided on one side of the main body is attached, and a drawer-type door is disposed in the front opening of each storage room other than the vegetable room (6).

  Each of the storage chambers circulates cold air by a refrigeration cooler (9) and a refrigeration cooler (10) provided for each refrigeration space and refrigeration space, and cooling fans (11) (12), ducts, Cooling control is performed to a predetermined set temperature.

  The refrigerating room (5) blows out the cold air generated by the refrigerating cooler (9) provided on the back surface inside the main body from the duct provided on the back surface by the fan (11) and refrigerates a part of the cold air. A structure in which the ceiling surface of the room (5) is blown and cooled from the front outlet (13a) to the upper part of the front of the room through the ceiling duct (13) installed in the front-rear direction with the ceiling surface slightly recessed toward the heat insulating material (4). And has the largest storage space as a storage room in the refrigerator, and a plurality of mounting shelves (14) are provided in the room to form a storage space for stored items, and the ceiling duct ( In the portion 13), an illuminating device (15) for illuminating the inside of the refrigerator compartment (5) is installed so as to exchange heat with the cold air flowing in the duct (13).

  The illumination device (15) has an opening formed in a portion near the front opening of the ceiling duct (13) installed in the front-rear direction on the ceiling surface of the refrigerator compartment (5), as shown in FIG. It is attached by a fixture (16) so as to close (13b). The fixture (16) is fixed with a fixture (17) shown in a partially enlarged cross-sectional view in FIG. 3 and a perspective view in FIG. 4. The fixture (17) is a high-performance semiconductor light emitting device. The substrate (19) to which the luminance type LED (20) is fixed is locked and fixed by the locking portions (17a) and (17b).

  The high-brightness type LED (20) has a characteristic that a sufficient brightness can be obtained with a low voltage and a small power, the brightness can be easily controlled by a current, the response speed is fast, the light emission is stable and the life is long. It is turned on and off by a door switch (not shown) that operates in conjunction with opening and closing of the refrigerator compartment door (8), and is input when the door is opened and is turned on by pulse energization.

  As shown in FIG. 5, the substrate (19) is formed from an epoxy resin formed in a thin plate shape that is long in the width direction of the refrigerator compartment (5), and the LED (20) 2 are fixed by soldering in the width direction, the interior side of the opening (13b) facing the LED (20) is covered with a shade (21), and the fixture (16) is attached to the ceiling duct ( 13) It is attached to a member, and when the refrigerator compartment door (8) is opened, the LED (20) is lit to act to illuminate the refrigerator compartment (5).

  The substrate (19) is attached to the fixture (17) with the LED (20) being tilted upward and inclined upward so that the refrigerator (5) illuminates the refrigerator compartment (5) widely from the upper front. On the back side of 19), a copper foil pattern (22) is formed as shown in FIG. 6 and its surface is covered with an epoxy resin resist (23) for insulation.

  In addition, the shade (21) is lightly diffusing light from the LED (20) and irradiating the interior (5). Although it is made of high acrylic resin, it is installed so as not to protrude from the lower surface of the ceiling duct (13), and consideration is given so as not to reduce the storage space above the refrigerator compartment (5).

  Moreover, since the illuminating device (15) is arranged on the ceiling surface near the front opening in the front-rear direction of the refrigerating room (5) as described above, 5) Since the interior is directed from the upper front to the back direction so that the stored item is illuminated from the direction of viewing by the user, the stored item can be easily viewed without being backlit. ) Is slightly separated from the stored item, so that the heat effect on the stored item can be reduced.

  Thus, the LED (20) is lit when the refrigerator door (8) is opened, but the temperature rises with the lighting. In particular, when the number of LEDs used is reduced to reduce costs and the brightness is increased to maintain brightness, the temperature rises further, and the LED (20) is fixed depending on the atmospheric conditions. The temperature exceeds the melting temperature of the solder that is being melted, resulting in a failure exceeding safety standards.

  Therefore, in one embodiment of the present invention, in order to ensure reliability, copper which is a good heat conductor is provided on the back surface of the substrate (19) on which the LED (20) in the lighting device (15) is soldered. By forming the foil pattern (22) widely and covering the surface with a resist (23), the copper foil pattern (22) dissipates the heat of the soldered portion of the LED (20) that is heated up. By this heat dissipation, the temperature rise of the soldered portion is suppressed, and it can be kept at a safe low temperature below the melting point.

  Further, in the configuration shown in the embodiment, the lighting device (15) is provided in a ceiling duct (13) portion disposed in the ceiling portion of the refrigerator compartment (5), and the cold air flowing in the duct (13) ( When the refrigerator compartment door (8) is opened, the lighting device (15) is turned on and the cooling air circulation fan (11) is driven to connect the ceiling duct ( The cool air from the cooler (9) is circulated through 13).

  The drive time of the fan (11) is during the opening time when the lighting device (15) is lit, but if the door is in a half-door state, the lighting device (15) will continue to be lit. Therefore, in consideration of the temperature rise due to this, control is performed so that the driving is continued for a time until the lighting device (15) is turned off for safety, for example, for 10 minutes.

  With this configuration, the copper foil pattern (22) on the back surface of the substrate (19) facing the cold air flow side is cooled by low-temperature cold air, and the soldered portion of the LED (20) on the substrate surface side is cooled by heat conduction And can dissipate heat.

  The good thermal conductor on the back surface of the substrate (19) is not limited to the configuration of the copper foil pattern (22), and although not particularly shown, an aluminum foil tape may be applied, or the substrate (19) itself. The same effect can be obtained by forming the metal plate with a metal plate having good heat conductivity.

  In addition, in the said Example, although it was set as the structure which arrange | positions an illuminating device (15) in the ceiling duct (13) of a refrigerator compartment (5), and accelerates | stimulates heat dissipation of a board | substrate (19) with a cold airflow, it is not restricted to this. First, if some space is provided around the board (19) to allow air to convection, heat dissipation is promoted by the good heat conductor on the back of the board (19), and the temperature of the soldered part of the LED (20) The rise can be suppressed.

  Moreover, although the refrigeration room (5) which has arrange | positioned the storage chamber which arrange | positions an illuminating device in the uppermost part of the refrigerator was demonstrated to the example, not only this but the uppermost storage room may be a freezer compartment, and also a lower part It goes without saying that the lighting device (15) may be installed on the indoor wall surface of the vegetable room (6) or the freezing room (7) arranged in the above-described manner with the same configuration as in the above embodiment.

It is a schematic longitudinal cross-sectional view which shows the refrigerator of this invention. It is whole sectional drawing of the illuminating device in FIG. FIG. 3 is an enlarged vertical sectional view of the substrate and the fixture of FIG. 2. FIG. 4 is a perspective view of FIG. 3. It is a surface view of the board | substrate shown in FIG. It is a reverse view of the board | substrate shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Outer box 3 Inner box 4 Heat insulation material 5 Refrigeration room 8 Door 9 Refrigeration cooler 11 Fan 13 Ceiling duct
13a Front outlet 13b Opening 15 Lighting device
16 Mounting tool 17 Fixing tool 17a, 17b Locking part
19 Board 20 LED 21 Shade
22 Copper foil pattern 23 Resist

Claims (7)

  A storage chamber formed in the heat-insulating housing, a door that freely closes and opens the front opening of the storage chamber, and a fan that is driven when the door is closed and supplies cool air generated by a cooler into the storage chamber; A duct through which cool air is circulated disposed in the ceiling of the storage room, a lighting device in a warehouse with LEDs provided to exchange heat with the cold air flowing in the duct, and a shade that covers the indoor side of the lighting device When the door is opened, the lighting device is turned on and the fan is driven to circulate cold air through the duct.   A lighting device in which a board having a plate surface made of a good heat conductor on the back surface is attached to an attachment member is fixed to a duct portion, and the back surface of the board is positioned on the cold air flow side. The refrigerator according to claim 1.   A storage room formed in a heat-insulating housing, a door for closing the front opening of the storage room so as to be openable and closable, and a warehouse with LEDs arranged on the ceiling of the storage room so as to light up when the door is opened. And a shade covering the indoor side of the lighting device. The lighting device has a plate surface made of a good heat conductor on the back surface of the substrate soldered with the LED, and the lighting device having the substrate attached thereto. A refrigerator characterized in that is fixed to the ceiling.   4. The refrigerator according to claim 2, wherein the substrate on which the LED is soldered has a copper foil pattern coated with a resist on its back surface.   4. The refrigerator according to claim 2, wherein the LED soldered substrate has an aluminum foil tape attached to the back surface thereof.   The refrigerator according to claim 1 or 3, wherein the substrate on which the LED in the lighting device is soldered is made of a metal having good heat conductivity.   The refrigerator according to claim 1 or 3, wherein the lighting device is arranged on the front side in the front-rear direction of the ceiling part of the storage room.

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