JPH0627606B2 - refrigerator - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an invention in which a radiant defrosting tube heater arranged to defrost a cooler efficiently generates heat.

[Background of the Invention]

A conventional refrigerator having this kind of structure will be described with reference to FIGS. 6 to 7. Reference numeral 1 denotes a refrigerator main body, 2 and 3 are freezer compartments formed inside the refrigerator main body 1, and are refrigerator compartments. is there. Reference numeral 4 denotes a partition wall that divides the freezing compartment 2 and the refrigerating compartment 3 from each other. Reference numeral 5 indicates a cold air passage formed in the partition wall 4. 6 is a cooler installed at the rear of the freezer compartment 2,
Reference numeral 7 denotes a radiation type defrosting tube heater installed below the cooler 6. Reference numeral 8 denotes rubber caps attached to both ends of the defrosting tube heater 7 for terminal treatment of lead wires (not shown). Reference numeral 9 is a ceiling cover installed between the cooler 6 and the defrosting tube heater 7. The ceiling cover 9 prevents the defrosting water dropped from the cooler 6 from hitting the defrosting tube heater 7 and generating an evaporation sound. In addition, the ceiling cover 9 has the defrosting tube heater 7 with the mounting legs 9a at both ends.
Is attached to the rubber cap 8 on the side, and also the support leg 9b
Is suspended on the cooler 6 described above. Reference numeral 10 is a gutter that receives the defrosted water dropped from the cooler 6. This gutter 10
As shown in the figure, is installed at the time of filling the refrigerator body 1 with the foamed heat insulating material. Reference numeral 11 is a protective body made of aluminum or the like. This protector 11 prevents the gutter 10 from being abnormally heated by the defrosting tube heater 7 and deforming. Reference numeral 12 is a drain provided to drain the defrost water accumulated in the gutter 10 to the outside of the storage. It should be noted that the defrosting tube heater 7 is normally used for the purpose of preventing frost or the like from forming in the cool air passage 5 (passage for returning the cool air discharged into the refrigerating chamber 3 to the cooler 6 portion) as shown in the figure. , This cold air passage 5
It is installed against. Reference numeral 13 is a partition plate that divides the inside of the freezer compartment 2 into a place where the cooler 6 is installed and a place where food is put. Reference numeral 14 is a fan guard, and 15 is a blower for cold air forced circulation. In the refrigerator having the conventional structure having such a configuration, the normal cooling operation is performed as follows.
That is, the cool air cooled by the cooler 6 is discharged into the freezer compartment 2 through the partition plate 13 and the fan guard 14 by the blower 15 for forced circulation in the refrigerator, while not shown in the refrigerating compartment 3 as well. It is discharged through the cold air passage.

The cold air discharged into the freezer compartment 2 and the refrigerating compartment 3 cools the food in each compartment, and then returns to the cooler 6 again. That is, the cold air in the freezer compartment 2 returns from the freezer compartment return cold air passage 16 and the refrigerating compartment cool air returns from the cold air passage 5.

While repeating this operation, frost is formed on the cooler 6,
When the defrosting tube heater 7 is energized to remove the accumulated frost, the cold air around the defrosting tube heater is heated by the heater 7 and rises to the cooler 6 side to remove the frost attached to the cooler 6. Comb The water melted in this process drops from the cooler 6 toward the defrosting tube heater 7. However, since the ceiling cover 9 is provided on the upper portion of the defrosting tube heater 7, the defrosting water directly ahead hits the defrosting tube heater 7 and does not emit an evaporation sound. Further, when the defrosting tube heater 7 is heated, the surface of the gutter 10 and the like are covered with the aluminum-made protective member 11, so that the gutter 10 is not abnormally heated and deformed.

Like the anomaly, the conventional refrigerator has a protective body 11 that covers the entire gutter 10 so that the refrigerator can be put to practical use. However, the cost of the protective body that covers the entire gutter 10 is great, and the refrigerator is also cooler. 6, ceiling cover 9, defrosting tube heater 7
In the refrigerator to which the above is attached, the fan guard 14 and the partition plate 13 are removed, and the cooler 6 is pulled out to the freezer compartment 2 side. At the time of service of the cooler 6, there was a problem that the defrosting tube heater 7 hits the part of the partition wall 4 and the cooler 6 is difficult to pull out.

Furthermore, since heat is not supplied from the defrosting tube heater 7 into the cold air passage 5 that cannot be covered with the aluminum protective body 11, heat from the defrosting tube heater 7 is not applied. When the supply is too much, the partition wall 4 that forms the cold air passage 5
There was also a problem such as thermal deformation of the heat insulating material.

[Object of the Invention]

The present invention has been made to solve the above various problems.

[Structure of Invention]

According to the present invention, a gutter is installed so as to face a cooler-side opening of a cold air passage provided in a partition wall to guide cold air circulating in the refrigerator to the cooler, and the cooler is arranged above the gutter. Along with
A defrosting tube heater for defrosting the cooler is placed between the gutter and the cooler, and the heat generating part of the defrosting tube heater is located inside a box-shaped cover with an open top surface. The upper surface of the tube heater is covered with a ceiling cover, a heating chamber surrounded by the box-shaped cover and the ceiling cover is located in the trough, and the box-shaped member faces the cooler-side opening of the cold air passage. A cutout window is provided in a part of the cover, and as a means for heating the inside of the cold air passage during defrosting, it is continuous from the gutter surface located immediately below the box-shaped cover to the end on the anti-cooler side of the bottom surface of the cold air passage. A heat transfer material such as an aluminum plate is attached.

Example of Invention

The details of the present invention will be described below with reference to an embodiment shown in FIGS.

Note that the same reference numerals in the drawings indicate the same things, and therefore their explanation is omitted.

27 is a radiation type defrosting tube heater provided with the present invention. Rubber caps 28 for treating the ends of lead wires (not shown) are provided at both ends of the defrosting tube heater 27. Reference numeral 29 is a box-shaped cover having an open top surface. Inside the box-shaped cover 29, the heat generating portion 27a of the radiation type defrosting tube heater 27 is located. Also, this box-shaped cover 29
As shown in FIG. 4, the cross-sectional shape is U-shaped, and the rising piece 29c located on the partition side of the box-shaped cover 29 has a middle portion on the upper side so that heated air can easily rise along the rising piece. It is inclined to the partition side.

Further, the box-shaped cover 29 elastically holds the rubber cap 28 by the holding portion 29b provided on the side wall 29a.

The box-shaped cover 29 is fixed to the rubber cap 28 by inserting the legs 30a of the ceiling cover 30 into the cutout holes 31 formed in the side wall 29a of the ceiling cover 30 as shown in FIG. It is completed when the spread to (Fig. 5) is limited. Reference numeral 32 is an air intake provided on the bottom surface of the box-shaped cover 29. From this air inlet 32, the cold air that has cooled the freezing chamber 2 and the refrigerating chamber 3 is supplied to the heating chamber 33 configured by the box-shaped cover 29, the ceiling cover 30, the defrosting pipe heater 27, and the like. It is a thing. Reference numeral 34 denotes an opening provided in a rising piece 29c portion (a rising piece located on the partition side) of the box-shaped cover 29. The opening 34 just faces the return passage 5 from the refrigerating chamber 3, and when the defrosting tube heater 27 is made to generate heat, it is an opening suitable for supplying an appropriate amount of heat to the passage 5, so that it has a box shape. It extends to the bottom surface of the cover 29. 5
Reference numeral 0 indicates the cold air return passage 5 from the refrigerating chamber 3 from the surface of the gutter 10 located immediately below the opening 34 provided in the box-shaped cover 29.
Cross section U continuously pasted to the end of the bottom of the
It is a heat transfer material such as a letter-shaped aluminum plate.

An end portion in the lateral width direction of the heat transfer material 50 is a fitting portion 4c between the upper member 4a and the lower member 4b of the partition wall which constitutes the partition wall 4.
It is fixed by sandwiching it. Reference numeral 51 denotes a heat transfer material such as an aluminum plate attached over the entire upper surface of the cold air passage 5. The heat transfer material 51 is also formed in an inverted U shape like the previous heat transfer material 50 and is formed between the partition walls 4a and 4b. The end is caught in. Reference numeral 35 denotes a guide piece provided above the opening 34. The guide piece 35 may have a length of about 3 to 10 mm and is formed so as to project in a substantially vertical direction with respect to the rising piece 29c so that the heated air or the heat wire does not rise along the rising piece from the upper part of the opening during defrosting. Has been devised. In other words, the heated air to the opening 34 efficiently supplies the amount of heat to the return passage 5 and serves to dissolve the frost adhering to the wall surface of the passage 5. Reference numeral 36 is a cutout window formed to face the return passage 16 from the freezer compartment 2. Since there is no temperature difference in the return passage 16, the amount of frost is smaller than that in the passage 5. In consideration of this, the passage 16 is provided with a canopy 36a for supplying less heat than the passage 5. Again 3
Reference numeral 6b denotes a notch provided at the upper end of the notch window 36 to supply heated air around the outlet of the freezer return passage 16 at the time of defrosting to remove frost, flicker or the like adhering around the outlet of the passage 16. Effectively acts on. Further, in the cutout 36b, a part of the cool air from the return passage 16 passes through the cutout 36b and is then guided to the upper cooler during the cooling operation, and the ventilation resistance during the cooling operation can be reduced. 37 is a hole provided in the bottom surface of the box-shaped cover 29 that also serves as an air intake. This hole and the size of the air intake 32 described above can supply the gutter 10 with the amount of heat without frost remaining in the gutter 10.
It is a size that does not deform. Reference numeral 38 denotes a support leg provided on the gutter 10. The support leg 38 is formed to have an elastic shape as shown in the figure, and when the rubber cap 28 is located at the holding portion 38a through the opening L of the support leg 38,
The support legs 38 fix the rubber cap 28 on the gutter 10.

Reference numeral 39 denotes an air discharge port opened in the upper portion of the box-shaped cover 29, and has an opening area sufficient to dissolve frost attached to the cooler during defrosting.

The defrosting tube heater 27 is installed in the refrigerator 1 after the rubber cap 28 is held by the holding portion 29b of the box-shaped cover 29, and then the ceiling cover 30 is installed in the box-shaped cover 29 to spread the box-shaped cover 29. Prevent it and position it.

The rubber cap 28 is incorporated in the support leg 38 of the gutter 10 in which the defrosting tube heater 27 thus assembled is incorporated in the main body side.

As described above, the refrigerating operation in the thus constructed refrigerator is substantially the same as that described in the conventional example, but at the time of defrosting, the defrosting water from the cooler 6 is dripped toward the defrosting pipe heater 27. As in the conventional case, the ceiling cover 30 prevents the heat from the defrosting tube heater 27, but most of the heat is not supplied to an extra place or a place where it should not be heated. It is used to heat the air temperature in the heating chamber 33 formed by the ceiling cover 30 and the ceiling cover 30. This is because the ceiling cover 30 and the box-shaped cover 29 are made of a metal having high reflectance such as aluminum, so that the heat rays radiated in the circumferential direction from the radiant tube heater are opened as necessary. It is used to raise the temperature of the air in the heating chamber as a result of diffuse reflection in the heating chamber except for the openings. For this reason, convection is generated in this portion and the warmed air is gradually raised from the air discharge port 39 provided in the upper part of the heating chamber along the slope of the rising piece 29c and then supplied to the cooler side. Defrosting is accelerated. In this process, the cooling air passage 5 is efficiently supplied with heated air by the action of the upper guide piece of the opening. Further, in the cutout portion 36b at the upper part of the rising piece, a part of the heated air rising from the air discharge port 39 is supplied to the peripheral portion of the passage 16 through the cutout portion 36b to accelerate the defrosting. The gutter bottom is supplied with the amount controlled by the air inlet or the hole of the box-shaped cover.

Further, a part of the radiant heat ray that has passed through the opening 34 of the box-shaped cover 29 is reflected by the surface of the heat transfer material attached to the gutter surface, and the height difference from the defrosting tube heater is small, so that the incident angle is small. It is possible to efficiently heat the upper surface of the cold air return passage 5 which is small and is not heated easily as shown by an arrow P2 in FIG. 4, and the heat absorbed without being reflected by the surface of the heat transfer material 50 is The heat is conducted to the entire bottom surface of the cold air return passage and the heating of this portion can be efficiently performed.

〔The invention's effect〕

As described above, according to the present invention, the heat generating portion of the defrosting tube heater is located in the box-shaped cover having an open upper surface, and the top surface of the defrosting tube heater is covered with the ceiling cover and the box-shaped cover and the ceiling cover. Since the heating room (the room where the heat generating part of the defrosting tube heater is located) surrounded by is located in the gutter installed in the lower part of the cooler, it is of course possible to perform efficient defrosting. The gutter can be prevented from being deformed without providing a large protective body as in the conventional case, and the inside of the cold air passage is not abnormally heated and thermally deformed.

Further, by providing an opening or a notch or the like for returning cold air in the rising piece 29c on the side of the intermediate partition, the amount of returning cold air during cooling operation can be increased and the refrigerating capacity can be increased.

Further, as a means for heating the inside of the cool air return passage during defrosting, a heat transfer material such as a continuous aluminum plate from the gutter surface located directly below the box-shaped cover to the end of the bottom surface inside the cool air return passage on the side opposite to the cooler. By affixing, the heat reflection and heat absorption of the heat transfer material can be used to efficiently heat the inside of the cold air return passage.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a refrigerator equipped with the present invention, FIG. 2 is a view showing a fixing structure of a defrosting tube heater shown in FIG. 1, and FIG. 3 is a cover installed in a gutter. FIG. 4 is a perspective view of a main part of the defrosting tube heater, FIG. 4 is a sectional view taken along line XX in FIG. 3, FIG. 5 is a view showing a combined state of a box-shaped cover and a ceiling cover included in the present invention, and FIG. Partial sectional view of a refrigerator showing a conventional structure,
FIG. 7 is a view showing a fixing structure of the defrosting tube heater shown in FIG. 1 ... Refrigerator body, 2 ... Freezer room, 3 ... Refrigerator room, 4 ...
… Partition walls, 5 …… Refrigerator passage, 6 …… Cooler, 27 ……
Defrosting tube heater, 27a ... Heating part of tube heater, 28 ...
... Rubber cap, 29 ... Box cover, 29a ... Side wall, 29b ... Clamping part, 29c ... Standing piece, 30 ...
Ceiling cover, 30a ... Leg, 31 ... Notched hole, 32 ...
Air inlet, 33 ... Heating chamber, 34 ... Opening, 35 ...
Guide piece, 36 ... Notched window, 36a ... Eaves, 36b
...... Rising piece notch, 37 ...... hole, 38 ...... support leg,
38a ... Holding part of support leg, 39 ... Air outlet, 40
...... Positioning legs 4a ...... Partition wall upper member 4b ......
Lower partition wall member, 50 ... Lower heat transfer material, 51 ... Upper heat transfer material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Susumu Yamazaki 800 Tomita, Ohira-cho, Shimotsuga-gun, Tochigi Inside Tochigi Plant, Hitachi, Ltd. (56) References: 57-109488 (JP, U) -16971 (JP, U)

Claims (1)

[Claims] 1. A gutter is installed so as to face a cooler-side opening of a cold air passage provided in a partition wall in order to guide the cool air circulating in the refrigerator to the cooler, and the cooler is provided above the gutter. In addition to arranging, a defrosting tube heater for defrosting the cooler is arranged between the gutter and the cooler, and the heat generating part of the defrosting tube heater is located in the box-shaped cover with the upper surface opened, The upper surface of the defrosting tube heater is covered with a ceiling cover, and a heating chamber surrounded by the box-shaped cover and the ceiling cover is located in the gutter, and faces the cooler-side opening of the cold air passage. A cutout window is provided in a part of the box-shaped cover, and as a means for heating the inside of the cold air passage during defrosting, an end portion on the anti-cooler side of the bottom surface inside the cool air passage from the gutter surface located immediately below the box-shaped cover Characterized by pasting continuous heat transfer material such as aluminum plate