JP2008286422A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce costs of a defrosting heater of a refrigerator using a combustible refrigerant and to miniaturize a cooling unit. <P>SOLUTION: In this refrigerator comprising a cooler 13 composed of a refrigerant tube and a plurality of fins, an electrically heated winding 9 of low rated output, provided with a cover radiant 12 on its upper portion, and a radiant heater 8 composed of the glass tube 10 and a cap 11, and using a combustible refrigerant, the rise of the surface temperature of the glass tube 10 can be prevented even when the defrosting heater using the inexpensive single tube as the glass tube 10 of the radiant heater 8, is applied, further cooling performance of high efficiency can be achieved by applying an efficient constitution of a cooling air trunk hardly disturbing the cooling flow channel, and an internal volume of the refrigerator can be increased by effectively utilizing a surplus space by miniaturizing the cooling unit. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a refrigerator using a combustible refrigerant that can ensure safety even when an inexpensive defrost heater is employed.

  In recent years, refrigerators have been defluorinated using a flammable refrigerant, and it is necessary to consider the environment. For this reason, even if a flammable refrigerant leaks into the refrigerator, the glass temperature of the defrost heater has a double structure to prevent the temperature rise so that the surface temperature of the defrost heater does not reach the ignition temperature ( For example, see Patent Document 1).

  Hereinafter, the conventional refrigerator will be described with reference to the drawings.

  FIG. 5 shows the periphery of a cooler of a conventional refrigerator described in Patent Document 1, and the cooler 7 includes a refrigerant pipe that circulates while the refrigerant evaporates and a cooling fin that exchanges heat.

  At the lower part of the cooler 7, a radiant heater 1 (defrost heater) is provided with caps at both ends of an electric heating coil 2, an inner glass tube 3, an outer glass tube 4, and a cover radiant 6 which is an umbrella for preventing defrosting water from splashing. 5 is held and configured.

In the above configuration, the frost attached to the cooler 7 is removed while the radiant heater 1 is energized at regular intervals and the defrost water falling from the cooler 7 is not directly applied to the radiant heater 1 while being avoided by the cover radiant 6. Frost.
JP 2003-90672 A

  However, in the above-described conventional refrigerator, the glass tube of the defrost heater is not connected to the inner glass tube 3 and the outer glass tube 4 so that the surface temperature of the defrost heater does not reach the ignition temperature even if flammable refrigerant leaks into the refrigerator. Since the temperature rise is prevented by using a double structure, an expensive defrost heater must be used, and a large-diameter glass tube must be protected from defrost water, so the cover radiant becomes larger and cools. There was a problem that the air path obstruction caused cooling performance deterioration and the cooling unit was enlarged.

  The present invention solves the above-described conventional problems, and can suppress the temperature rise of the surface temperature of the glass tube even when the glass tube of the radiant heater is single by keeping the rated output of the radiant heater low. High-efficiency cooling performance can be realized by using an efficient cooling air passage configuration with less air passage obstruction, and the internal volume of the refrigerator can be increased by making effective use of excess space by downsizing the cooling unit. The object is to provide a refrigerator.

  In order to solve the above-mentioned conventional problems, the refrigerator of the present invention is a radiant composed of a refrigerant tube and a plurality of fins, a cover radiant provided on the top, and a low rated output electric heating coil, a glass tube and a cap. In a refrigerator using a combustible refrigerant provided with a heater, the glass tube of the radiant heater is a single tube.

  This makes it possible to prevent the surface temperature of the glass tube from rising even when an inexpensive defrosting heater with a single tube is used, and to achieve high efficiency by making an efficient cooling air passage configuration with little cooling air passage obstruction. Cooling performance can be realized, and the internal volume of the refrigerator can be increased by effectively utilizing the surplus space by downsizing the cooling unit.

  The refrigerator of the present invention is capable of preventing the temperature rise of the surface of the glass tube even when the glass tube of the radiant heater is single by keeping the rated output of the radiant heater low, and is efficient with less cooling air path obstruction. By adopting a cooling air passage configuration, high-efficiency cooling performance can be realized, and the internal volume of the refrigerator can be increased by reducing the size of the cooling unit.

  The invention according to claim 1 uses a flammable refrigerant comprising a cooler comprising a refrigerant tube and a plurality of fins, an electric heating winding provided with a cover radiant on the top, a radiant heater comprising a glass tube and a cap. In the refrigerator, the glass tube of the radiant heater is a single tube, and the surface temperature of the glass tube is lower than the ignition temperature of the flammable refrigerant, so that the cost of the radiant heater can be reduced.

  The invention according to claim 2 is the invention according to claim 1, wherein the rated output of the radiant heater is 70 W or more and 100 W or less, and the surface temperature of the glass tube is surely lower than the ignition temperature of the flammable refrigerant. It can be.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the clearance from the glass tube surface of the radiant heater to the cover radiant is 8 mm or more and 15 mm or less, and the defrosting efficiency is increased. However, it is possible to prevent water on the glass tube surface.

  The invention according to claim 4 is the invention according to any one of claims 1 to 3, wherein the width of the cover radiant is 20 mm or less, and the cooling air passage is minimized. Cooling performance can be maintained.

  According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the width dimension of the cover radiant is less than half the depth dimension of the cooler. The road resistance can be minimized, and high-efficiency cooling performance with little obstruction of the cooling air path can be realized.

  The invention according to claim 6 is the invention according to any one of claims 1 to 5, wherein the height of the cooler is set to 150 mm or less, and the cooling unit can be reduced in size. By effectively using the space, the internal volume of the refrigerator can be increased.

  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)
1 is a perspective view of the periphery of the refrigerator cooler according to Embodiment 1 of the present invention, FIG. 2A is a side view of the periphery of the refrigerator cooler according to Embodiment 1, and FIG. 2B is the periphery of the cooler. FIG. 3 is a characteristic diagram showing the correlation between the rated output of the radiant heater and the glass tube surface temperature, and FIG. 4 is a gap dimension between the glass tube surface of the radiant heater and the cover radiant and the glass tube surface. It is a characteristic view which shows the correlation of temperature.

  1 to 4, reference numeral 13 denotes a refrigerator cooler, which includes a refrigerant pipe that circulates while the refrigerant evaporates and a cooling fin that exchanges heat.

  At the lower part of the cooler 13, a radiant heater 8 (defrost heater) has an electric heating winding 9 with a low rated output, a single glass tube 10, and a cover radiant 12, which is an umbrella for preventing the defrost water from splashing at both ends. It is configured to be held by a cap 11.

  And the rated output of the radiant heater 8 is set to 70 W or more and 100 W or less, and the surface temperature of the glass tube of the radiant heater 8 is controlled to be less than 430 ° C. that is the ignition temperature of the flammable refrigerant.

  In FIG. 2A, the gap dimension G1 from the glass tube surface of the radiant heater 8 to the cover radiant 12 is set to 8 mm or more and 15 mm or less. Further, the width W2 of the cover radiant 12 is set to 20 mm or less.

  The height H3 of the cooler 13 is set to 150 mm or less, and the width dimension W2 of the cover radiant 12 is set to half or less of the depth dimension D2.

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

  The frost attached to the cooler 13 causes the radiant heater 8 to be energized at regular intervals, and the defrost water falling from the cooler 13 is defrosted while being avoided by the cover radiant 12 so as not to be directly applied to the radiant heater 8. By controlling the heating value of the radiant heater 8 to a low rated output of 100 W or less, an excessive increase in the surface temperature of the glass tube can be prevented even with an inexpensive defrost heater with a single tube. The surface temperature of the glass tube can be suppressed below the ignition temperature of the combustible refrigerant. In addition, when the electric heating winding has a rated output of 70 W or more, an appropriate defrosting temperature can be ensured, and the defrosting time can be prevented from increasing and the temperature inside the chamber can be prevented from rising.

  Further, since the gap dimension G1 between the cover radiant 12 and the glass tube 10 of the radiant heater 8 is set to 8 mm or more, the far-infrared ray necessary for defrosting is cooled from the top by minimizing the hot-cold portion 16 on the glass tube surface. The distance irradiated to the container 13 can be secured, and even if the flammable refrigerant leaks into the refrigerator, the surface temperature of the defrost heater does not reach the ignition temperature. When the gap dimension G1 is less than 8 mm, the hot-cold portion 16 on the surface of the glass tube increases, the surface temperature rises dramatically, and a distance for irradiating the cooler 13 with far-infrared rays necessary for defrosting from the top is ensured. I can't. Moreover, it is possible to prevent the glass tube 10 from being covered with defrost water by setting the gap dimension G1 to 15 mm or less.

  In addition, the wind is configured so that the width of the cover radiant 12 is set to 20 mm or less and the relationship with the depth dimension D2 of the cooler 13 is set to 1/2 * D2 ≧ W2 so as to pass from the lower part of the cooler 13 to the upper part. The air path resistance of the cold air 15 circulating in the path 14 can be minimized, and high-efficiency cooling performance with little cooling air path obstruction can be realized.

  In addition, the cooling performance can be maintained even if the height dimension H3 of the cooler 13 is 150 mm or less, and the overall height H2 of the cooling unit can be downsized. Therefore, the internal space of the refrigerator can be reduced by effectively utilizing the surplus space. Can be increased.

  As described above, the refrigerator according to the present invention can ensure safety even when an inexpensive defrosting heater using a flammable refrigerant is employed, and can be applied to general refrigeration equipment.

1 is a perspective view of a refrigerator periphery of a refrigerator according to Embodiment 1 of the present invention. (A) Side view around the refrigerator cooler in the embodiment (b) Side view showing the air condition around the refrigerator cooler in the embodiment Characteristic chart showing correlation between rated output and temperature of refrigerator in the same embodiment Characteristic chart showing correlation between gap size and temperature of refrigerator in the same embodiment Perspective view around the cooler of a conventional refrigerator

Explanation of symbols

8 Radiant heater 9 Electric heating winding 10 Single glass tube 11 Cap 12 Cover radiant 13 Cooler

Claims (6)

  In a refrigerator using a flammable refrigerant comprising a cooler comprising a refrigerant tube and a plurality of fins, an electric heating winding provided with a cover radiant on the top, a radiant heater comprising a glass tube and a cap, the glass of the radiant heater The refrigerator is characterized in that the tube is a single tube and the surface temperature of the glass tube is lower than the ignition temperature of the combustible refrigerant.   The refrigerator according to claim 1, wherein the rated output of the radiant heater is 70 W or more and 100 W or less.   The refrigerator according to claim 1 or 2, wherein a gap from the glass tube surface of the radiant heater to the cover radiant is 8 mm or more and 15 mm or less.   The refrigerator according to any one of claims 1 to 3, wherein a width dimension of the cover radiant is 20 mm or less.   The refrigerator according to any one of claims 1 to 4, wherein a width of the cover radiant is less than half of a depth of the cooler.   The refrigerator according to any one of claims 1 to 5, wherein a height dimension of the cooler is set to 150 mm or less.