JP3906868B2 - refrigerator - Google Patents

Description

  The present invention relates to a defrosting tube heater for a refrigerator in which a freezer compartment is disposed at the lowermost part.

  An example of a conventional refrigerator will be described with reference to FIGS. 3 is a longitudinal sectional view of a conventional refrigerator, and FIG. 4 is an explanatory view of the cooler chamber of FIG.

  In the figure, reference numeral 101 denotes a refrigerator main body. The refrigerator main body 101 is filled with a heat insulating material such as urethane foam between an outer box and an inner box to form a storage room, and a refrigerator room 103 from above. The vegetable compartment 105, the freezer compartment 107, and doors 109, 111, 113 for opening and closing each storage compartment are formed in front of the opening. Reference numeral 115 denotes a partition wall, and the partition wall 115 is provided to partition the vegetable compartment 105 and the freezing compartment 107.

  117 is a cooler, and the cooler 117 is attached to the back wall 119 of the freezer compartment 107 and is connected to a compressor 121 forming a part of a known refrigerating cycle to supply cool air for the storage compartment. . Reference numeral 123 denotes a cool air circulation fan. The cool air circulation fan 123 is attached to the upper portion of the cooler 117 and blows the cool air from the cooler 117 to the refrigerator compartment 103, the vegetable compartment 105, and the freezer compartment 107. 125 is a cool air return duct, and the cool air return duct 125 is provided in parallel with the cooler 117 on the back wall 119 so that the return cool air from the refrigerator compartment 103 and the vegetable compartment 105 is blown below the cooler 117. Is provided.

  Reference numeral 127 denotes a partition plate. The partition plate 127 is disposed between the cooler 117 and the cool air return duct 125, and moisture is formed on the inner surface of the cool air return duct 125 due to a temperature difference between the cooler chamber 129 and the cool air return duct 125. The duct 125 and the cooler chamber 129 are thermally partitioned so that dew condensation, frost formation, and the like can be suppressed by the return cold air containing the.

  Reference numeral 131 denotes a defrosting tube heater. The defrosting tube heater 131 is disposed at the lower part of the cooler 117 and is frosted on the cooler by cold air containing moisture blown through the cold air return duct 125. It is provided to defrost frost. Reference numeral 133 denotes a residual frost prevention heater, which is attached to the partition plate 127 to heat the partition plate 127 and is disposed to prevent residual frost in the cool air return duct.

Such a technique is disclosed in, for example, Japanese Patent Application Laid-Open No. 8-110146.
JP-A-8-110146

  The above conventional refrigerator has the following problems. That is, in order to prevent the cooling efficiency in the warehouse from decreasing due to frost on the cooler, a defrosting tube heater that defrosts the frost that has formed frost, and a residual frost prevention that prevents residual frost in the cool air return duct A heater was needed.

At the same time, in the conventional technology, the defrosting tube heater is provided to defrost the frost that forms on the cooler, and is necessarily provided so as to be positioned on the projection surface below the cooler. There are many cases. For this reason, the heat from the defrosting tube heater does not reach the bottom of the cool air return duct 125, that is, the portion on the right side of the partition wall 127 shown in FIG. However, since this part is a part where the air flowing through the duct changes its direction and flows toward the cooler, the air easily stagnate and easily adheres to frost, and the attached frost remains even after the defrosting operation of the refrigerator is completed. If it is, the frost that remains during the cooling operation of the refrigerator again grows further with frost adhering. Thus the area of the outlet portion of the cooler of the cool air return duct is reduced by frost grown, cooling efficiency circulation of cool air stagnation will beat low.

  In order to prevent this, the exit area from the duct 125 to the cooler may be increased in consideration of frost. In this case, in order to guide the cool air from the duct 125 to the lower side of the cooler 117. Since it is necessary to extend the tip of the partition wall 127 to the lowermost part of the cooler 117, a space for mounting the cooler must be increased, and the volume of the storage chamber is reduced and the parts are also enlarged. Therefore, there is a refrigerator having a configuration in which a residual frost prevention heater is embedded in a duct outlet portion on the right side portion of the previous partition wall 127.

  In such a cold conventional refrigerator, there is a problem that the cost of the refrigerator is increased due to an increase in the number of parts such as the plurality of heaters described above and the trouble of attaching these heaters.

  Furthermore, the temperature of the air in the cool air return duct and the duct inside it rises due to the hot air from the residual frost prevention heater, and the heated air enters each storage room in the warehouse, particularly the refrigerator room and vegetable room. There was a problem that it was. Moreover, if the heater temperature of the residual frost prevention heater is lowered by avoiding excessive temperature rise in the duct in order to prevent this, there is a problem that the frost on the partition plate cannot be effectively heated.

  An object of the present invention is to provide a refrigerator that eliminates the above-mentioned problems and performs good cooling at low cost.

In order to achieve the above object, in the refrigerator of the present invention, a plurality of storage rooms each including a refrigerator compartment, a vegetable compartment, and a freezer compartment, a cooler that cools the air inside, and a lower portion of the cooler A defrosting tube heater disposed to defrost the cooler, a cool air return passage arranged in parallel on the back side of the refrigerator via the cooler and a partition member, and a lower side of the cooler. In the refrigerator having a discharge port of the cold air return passage and a discharge port provided above the cooler, the defrosting unit is disposed below the cooler and on the side opposite to the cooler with the partition member interposed therebetween. An end portion of the tube heater is arranged, and the lower part of the partition member rises toward the cold air return passage so that hot air of the defrost tube heater is sent to the cold air return passage, and the defrost tube heater to the cold air return passage of air heated are the condenser and arranged by Ku is intended.

Further, the shape of the lower end portion of the partition member is a shape in which heat from the end portion of the defrosting tube heater reaches the horizontal projection region of the cooler inside the cold air return passage .

Further, the shape of the lower end portion of the partition member is a tapered shape that rises on the cold air return path side .

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerator which performs cheap and favorable cooling can be provided.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a longitudinal sectional view of an essential part of a refrigerator room of the refrigerator of the present invention, and FIG. 2 is a perspective view of an essential part of the refrigerator room of the refrigerator of the present invention.

  In the figure, reference numeral 1 denotes a cooler room, and the cooler room 1 is formed on the back wall of the freezer compartment in a refrigerator provided in the lower part of the freezer compartment and vegetable compartment, 2, a refrigerator compartment, and a cold air return duct 3 in a vegetable compartment are arranged in parallel via a partition plate 4. The cooler 2 is connected to a well-known refrigeration cycle and supplies cold air. The cool air is blown into the respective chambers by a cool air circulation fan 5 disposed in the upper part of the cooler 2 to cool the chambers, and returns to the cooler 2 again through the cool air return duct 3. The cold air return duct 3 is formed by the partition plate 4.

  Further, since the projection surface of the cooler 2 on the cold air return duct 3 side of the partition plate 4 is cooled by the cooler 2, when the return cold air containing moisture from the refrigeration room and vegetable room passes, Moisture is absorbed and condensation or frosting occurs. In order to melt the adhering frost and prevent the residual frost, a conventional refrigerator is provided with a residual frost prevention heater in this portion.

  Reference numeral 6 denotes a defrosting tube heater. The defrosting tube heater 6 is used to prevent residual frost on the partition plate 4 of the cool air return duct 3 from remaining on the partition plate 4 below the cooler 2. A position that exerts a thermal influence, for example, is arranged extending to the cold air return duct 3 side. Accordingly, the defrosting tube heater 6 defrosts the frost in the cooler 2 and at the bottom of the partition plate 4 on the cold air return duct 3 side without using the residual frost prevention heater conventionally used for this portion. It melts surface frost and prevents residual frost. Thereby, the heater for anti-residual frost which was conventionally required can be omitted, and the manufacturing cost and labor during manufacturing can be reduced. Moreover, since the frost adhering to the vicinity of the exit of the cold air return duct 3 can be effectively defrosted or the residual frost can be suppressed, a decrease in cooling efficiency can be prevented.

  Reference numeral 7 denotes a shielding plate. The shielding plate 7 has a sunlight-like shape inclined downward, and is disposed on the cool air return duct 3 side of the partition plate 4 above the projection surface of the cooler 2 for defrosting. It is provided to prevent the hot air from rising by the tube heater 6 and to retain the hot air on the projection surface of the cooler 2 on the cold air return duct side 3 of the partition plate 4. By making the shielding plate 7 into a sunshine shape inclined downward, the ventilation resistance of the cold air is reduced. As an example, the extending dimension L2 of the shielding plate 7 is substantially half of the width dimension L1 of the cool air return duct 3, and the width dimension D2 of the shielding plate 7 is made substantially coincident with the width dimension D1 of the cooler 2. In this way, the rising of the hot air in the extended portion L1 of the defrosting tube heater 6 is temporarily stopped by the shielding plate 7 and the hot air is applied to the residual frost formed in the lower portion of the partition plate 4 to thereby leave the residual air. The frost can be heated so that the residual frost on the partition plate 4 is eliminated. Further, by temporarily stopping the rise of hot air in the extending portion L1 of the defrosting tube heater 6 by the shielding plate 7, this hot air does not directly enter the storage chambers through the cold air return duct 3, and each storage It is possible to prevent the chamber temperature from rising.

  Furthermore, a taper on the cold air return duct side is provided at the lower end of the partition plate 4 so that hot air from the defrosting tube heater 6 is sent to the cold air return duct 3. This taper portion makes it easy for the air heated by the heater 6 to move toward the inside of the cold air duct 3 to which frost has adhered, and allows the heat rays from the heater 6 to reach the inner wall surface of the duct. That is, the inclination of the taper part is formed so that at least the heat rays from the heater end part reach the area where the cooler 2 is projected in the substantially horizontal direction inside the duct 3.

  As described above, in order to prevent the residual frost in the partition plate portion of the cool air return duct, a defrosting tube heater is disposed at the lower part of the cooler at a position that thermally affects the residual frost on the partition plate. Therefore, the heater for preventing residual frost conventionally attached to the partition plate 4 to prevent the residual frost of the partition plate 4 or the heater embedded in the outlet side wall of the cold air return duct is deleted. By combining the defrosting prevention heater with the defrosting tube heater 6, an inexpensive refrigerator with a small number of parts can be provided.

  Further, the surface of the partition plate on the cold air return duct side prevents the rise of hot air by the defrosting tube heater above the projection surface of the cooler, and the surface of the partition plate on the cold air return duct side of the cooler A shielding plate for retaining the hot air is provided on the projection surface, and the shielding plate is shaped like a sunshine inclined downward. With this configuration, the rise of hot air generated from the defrosting tube heater 6 is temporarily stopped by the shielding plate 7, and this hot air effectively dissolves residual frost adhering to the lower portion of the partition plate 4, where the hot air is cooled, Since it enters into each store room through cold air return duct 3, the temperature rise of each store room becomes small, and the refrigerator which realizes good cooling in a warehouse can be provided.

  Furthermore, since the lower end surface portion of the partition plate is provided with an upward taper on the cold air return duct side so that the hot air of the defrosting tube heater is sent to the cold air return duct side, the inside of the cabinet heated by the heater By effectively guiding air into the cool air return duct and directing the heater's hot wire to the area where the cooler on the inner wall of the duct is projected, the defrost and residual frost can be prevented more effectively, and a better warehouse A refrigerator that achieves internal cooling can be provided.

The principal part longitudinal cross-sectional view of the cooler room of the refrigerator of this invention. The principal part perspective view of the cooler room of the refrigerator of this invention. The longitudinal cross-sectional view of the conventional refrigerator. Explanatory drawing of the cooler chamber of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Cooler room 2 ... Cooler 3 ... Cold air return duct 4 ... Partition plate 5 ... Cooling air circulation fan 6 ... Defrosting tube heater 7 ... Shielding plate

Claims (3)

A plurality of storage rooms each having a refrigeration room, a vegetable room, and a freezer room, a cooler that cools the air inside, and a defrosting tube that is disposed below the cooler and defrosts the cooler A heater, a cool air return passage arranged in parallel on the back side of the refrigerator via the cooler and a partition member, a discharge port of the cool air return passage provided below the cooler, and the cooler In a refrigerator provided with a discharge port provided above,
The end of the defrosting tube heater is disposed below the cooler and on the side opposite to the cooler across the partition member,
The lower part of the partition member is shaped to rise toward the cold air return passage so that hot air of the defrost tube heater is sent to the cold air return passage, and the air heated by the defrost tube heater is supplied to the cooler. A refrigerator that leads to the cold air return passage arranged in parallel .   The shape of the lower end portion of the partition member is a shape in which heat from an end portion of the defrosting tube heater reaches a horizontal projection region of the cooler inside the cold air return passage. Item 10. The refrigerator according to Item 1.   3. The refrigerator according to claim 1, wherein the shape of the lower end portion of the partition member is an upward tapered shape on the cold air return passage side.

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