JPH04190077A - Freezing refrigerator - Google Patents

Abstract

PURPOSE:To prevent frosting in a duct as well as concentrated frosting on the lower part of a cooler by a method wherein a returning duct, communicating a refrigerating chamber with a heat exchanging chamber, and a heater are buried in a heat insulating back wall while the heater is arranged near the discharging side opening of the returning duct. CONSTITUTION:Cold air, whose heat is exchanged in a cooler 11, is sent into a discharging duct 20 and is sent out into a freezing chamber 8 to cool materials to be cooled, then, is returned into a heat exchanging chamber 13 through a suction duct 22. On the other hand, one part of the cold air is sent out into a refrigerating chamber 6 through a returning duct 23. In this case, the cold air, passing through the returning duct 23, is heated by a duct heater 24 and, therefore, frosting in the duct 23 can be prevented surely. On the other hand, wet returning cold air, discharged out of the discharging side opening 23B of the returning duct 23, is heated by the heater 29 and, thereafter, is returned into the heat exchanging chamber 13 whereby frosting on the lower part of the cooler 11 can be prevented effectively.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to a refrigerator-freezer that has a freezer compartment and a refrigerator compartment separated by a partition wall, and that cools both compartments with a single cooling unit. It is.

(b) Prior art As prior art to the present invention, for example, Japanese Patent Application Laid-Open No. 63-1292
Publication No. 83 discloses that the interior of the refrigerator is divided by a partition wall into a freezer compartment in which a cooling unit is installed and a refrigerator compartment, communication passages are formed above and below the partition wall to communicate the two compartments, and the cooling unit is A refrigerator-freezer is configured with a cold air circulation system that circulates part of the cold air heat-exchanged in the cooler to the refrigerator compartment. A duct heater that heats, a heat insulating material covering the heater, a duct cover covering the heat insulating material, a support plate disposed inside the duct, and return cold air attached to the support plate and passing through the duct. The duct cover is screwed onto the wall of the freezing chamber, and one end opening of the duct is made to communicate with the lower communication passage, and the other end opening is used to suck in cold air from the cooling unit. A refrigerator-freezer configured to face the mouth is disclosed.

(c) Problems to be Solved by the Invention According to the conventional refrigerator-freezer, since the cooling unit and the return duct are disposed within the freezer compartment, there is a problem that the effective volume inside the refrigerator is reduced.

Furthermore, since the return duct passes through the freezing chamber, it is necessary to increase the capacity of the duct heater and the return air heater to prevent the humid air in the duct from forming ice, which is uneconomical and inefficient.

Furthermore, since the opening at the other end of the duct and the cooling unit face each other across the space in the freezer compartment, it is difficult to prevent concentrated frost formation at the bottom of the cooler unless the return air heater has a considerably large capacity. It was difficult.

Moreover, since priority must be given to preventing frost formation within the duct, the surface temperature of the duct becomes high, and this has the problem of increasing the temperature of the freezer compartment.

In view of the problems of the prior art, the present invention aims to increase the effective volume of the freezer compartment, reduce the capacity of the heater to prevent frost formation in the duct, and prevent concentrated frost formation at the bottom of the cooler. We provide a refrigerator-freezer that aims to prevent this and eliminate the influence of temperature on the freezer compartment.

(d) Means for Solving the Problems In order to achieve the above object, the present invention divides the inside of a heat insulating box into a refrigerator compartment and a freezing compartment having an opening on one side by a partition wall, and A cooler and a cold air circulation fan are housed in a cooling box defining a heat exchange chamber that communicates with the freezing chamber through a section, and a discharge port is provided in the upper part of the freezing chamber to supply discharged cold air to the freezing chamber. A part of the discharged cold air is guided to the refrigerator compartment through a passage formed in the partition wall. A refrigerator-freezer is provided in which a return duct communicating with an exchange room and a heater for heating the return cold air are buried, and a heater for heating the return cold air discharged from the opening is arranged near the discharge side opening of the return duct. It consists of

(E) Effect According to the present invention, since a cooler, a cold air circulation fan, and a return duct are not provided in the freezing compartment, the effective volume of the freezing compartment increases.

In addition, since the return duct is buried within the insulated back wall, the return cold air from the refrigerator compartment will not drop due to the temperature influence of the freezer compartment, so the heater capacity can be reduced. Furthermore, it is possible to prevent the temperature of the freezer compartment from rising due to the heat of the heater.

By the action of the heater that heats the returned cold air just before it is heat exchanged with the cooler, concentrated frost formation at the bottom of the cooler can be prevented.

(F) Examples Examples of the present invention will be described below with reference to FIGS. 1 to 8. All drawings relate to the refrigerator-freezer of the present invention.
Figure 1 is a cross-sectional plan view, Figure 2 is a perspective view with the door partially open, Figure 3 is a longitudinal front view, Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 5 is a duct and related items. A perspective view showing the structure of the parts, Fig. 6 is a perspective view showing the installation state of the heater that prevents frost formation on the cooler, Fig. 7 is a sectional view taken along line B-B in Fig. 6, and Fig. 8 is the cooler. The heater that prevents frost formation and its installation are shown in an exploded perspective view of the parts. 1 is an exploded perspective view of the parts. In the constructed heat insulating box body, a heat insulating partition wall 5 is provided inside the box body 1.
The compartment is divided into a right-hand side refrigerating room 6 and a left-hand side freezing room 8 having an opening 7 on one side. A heat insulating opening/closing door 9 is provided in front of the refrigerator compartment 6 and the freezer compartment 8. 1
0 is a side-opening cooling box that defines a heat exchange chamber 13 in which a plate fin type cooler 11 and a cooling unit such as a cold air circulation fan 12 are housed above the cooling box. 10 is connected so that the freezing chamber 8 and the heat exchange chamber 13 are communicated with each other. Reference numeral 14 denotes a machine room arranged in parallel with the heat insulating box 1, and inside the machine room 14, a condensing unit 15 connected to the cooler 11 and the cooling box 10 are housed above the condensing unit 15. A machine room door 16 that can be opened and closed is provided on the front surface.

A cooler 1 is installed in the upper part of the freezer compartment 8 along the ceiling wall.
1, and the cooling air is exchanged through the opening 7 by the cold air circulation fan 12.
A plurality of discharge ports 17 are formed on the lower surface for supplying cold air blown out from the refrigerator compartment 8 to the refrigerator compartment 8, and a part of the discharged cold air is passed through a passage 18 formed in the upper part of the partition wall 5 to the refrigerator compartment 8. A discharge duct 20 having a refrigeration duct 19 leading to the refrigerator 6 is provided. In addition, a plurality of suction ports 21 are provided on the side of the freezer compartment 8 to return the cold air after cooling to the heat exchange compartment 13.
A suction duct 22 is provided.

Furthermore, a return duct 23 that communicates between the refrigerator compartment 6 and the heat exchange chamber 13 and a duct heater 24 that heats the returned cold air are buried in the insulation back wall of the insulation box 1. To explain in detail, the suction side opening 23A of the return duct 23 faces the refrigerator compartment 6 from the rear wall of the refrigerator compartment 6, and the discharge side opening 23A of the duct 23 faces the refrigerator compartment 6 from the rear wall of the refrigerator compartment 6.
B faces into the opening 7 formed on one side of the freezer compartment 8. A duct heater 24, which is constructed by bonding a meandering heater to an aluminum sheet, is arranged to surround the duct 23. In addition, 25 and 26 are
This is a sealing material that prevents leakage of the foamed heat insulating material 4 such as polyurethane. Further, 27 is a heat insulating material such as foamed polyethylene, which is placed in advance in the space between the return duct 23 and the inner box 2. The heat insulating material 27 is effective in preventing the foaming solution from circulating due to the narrow spacing. 28 is provided opposite to the refrigerator compartment 6 side of the passage 18,
This is a damper device that adjusts the amount of cold air sent into the refrigerator compartment 6.

In addition, as shown in FIGS. 6 to 8, the return duct 23
A heater 29 is disposed near the discharge side opening 23B to prevent frost formation on the lower part of the cooler 11 by heating the return cold air discharged from the opening 23B. The heater 2
Similar to the duct heater 24 described above, 9 is constructed by adhering a meandering heater to an aluminum sheet. The heater 29 has a guide plate 30A bent at the lower part and tilted low toward the heat exchange chamber 13. The attachment plate 30A is glued to the root 30, and a heat insulating plate 3I is glued to cover the guide plate 30A. on the other hand,
A support plate 32 is removably fixed to the wall surface of the freezer compartment 8 along the lower edge of the opening 7. This support plate 32 has a bent portion 32A whose upper portion is bent low toward the heat exchange chamber 13, and the tip thereof is bent upward to form a mounting surface 32B.

This attachment removably fixes the support plate 32 to the surface 32B. As a result, the heater 29 is connected to the return duct 23.
It is located along the return cold air discharged from the discharge side opening 23B. 33 is a lead wire of the heater 29, and 34 is a clip for fixing the lead wire 33.

Note that the ends of the guide plate 30A of the plate 30 and the bent portion 32A of the support plate 32 face the drain pan 35 disposed below the cooler 11, Water droplets adhering to the drain pan 35 are collected.

In the above configuration, the cold air heat-exchanged in the cooler 11 is sent into the discharge duct 20 by the circulation fan 12, and is blown out from the discharge port 17 into the freezing compartment 8 to cool the uncooled air (
(not shown), returns to the heat exchange chamber 13 from the suction port 21 through the suction duct 22, and repeats the circulation operation in which heat is exchanged in the cooler 11 again.

On the other hand, a part of the cold air heat-exchanged in the cooler 11 is guided to the passage 18 through the refrigeration duct 19 and blown out into the refrigeration compartment 6 to cool non-cooled items (not shown). The air is sucked in through the suction side opening 23A, passes through the return duct 23, returns to the heat exchange chamber 13 through the discharge side opening 23B, and is heat exchanged again in the cooler 11, repeating the circulation operation.

At this time, since the cold air passing through the return duct 23 is warmed by the duct heater 24, frost formation inside the duct 23 can be reliably prevented.Moreover, since the return duct 23 is buried within the insulating back wall, In addition, the cold air can be efficiently heated with the small capacity duct heater 24 without being affected by the temperature of the freezer compartment 8.

In addition, the moist return cold air discharged from the discharge side opening 23B of the return duct 23 is heated by the heater 29, and then
Since the heat exchanger 13 returns to the heat exchange chamber 13, frost formation on the lower part of the cooler 11 can be effectively prevented.

(g) Effects of the Invention As described above, in the present invention, since a cooler, a cold air circulation fan, and a return duct are not provided in the freezing compartment, the effective volume of the freezing compartment increases.

In addition, since the return duct is buried in the insulated back wall, the return cold air from the refrigerator compartment will not drop due to the temperature influence of the freezer compartment, so a small-capacity duct heater can reduce the temperature of the air inside the duct. Frost can be reliably prevented. Moreover,
It is also possible to prevent the temperature of the freezer compartment from rising due to the heat of the heater.

Furthermore, since the return cold air immediately before being heat exchanged in the cooler is heated by the heater, concentrated frost formation at the bottom of the cooler can be effectively prevented.

[Brief explanation of drawings]

All drawings relate to embodiments of the refrigerator-freezer of the present invention.
Figure 1 is a cross-sectional plan view, Figure 2 is a perspective view with the door partially open, Figure 3 is a vertical front view, Figure 4 is a sectional view taken along line A-A in Figure 3, and Figure 5 is a duct and related items. Figure 6 is a perspective view showing the installation of the heater that prevents frost formation on the cooler, Figure 7 is a sectional view taken along line B-B in Figure 6, Figure 8 is the cooler. A heater for preventing frost formation and its installation is an exploded perspective view of parts. 1...Insulating box body, 5...Partition wall, 6...Refrigerating room,
7--opening, 8--freezing chamber, 13-cooling box body, 11
... Cooler, 12 - Cold air circulation fan, 13 - Heat exchange chamber, 17 - Discharge port, 18 - Passage, 20 - Discharge duct, 23 - Return duct), 23B - Discharge Side opening, 24... duct heater, 29... heater.

Claims (1)

[Claims] 1. A cooling box interior that is divided into a refrigerator compartment and a freezing compartment having an opening on one side by a partition wall, and defines a heat exchange chamber that communicates with the freezing compartment via the opening. A cooler and a cold air circulation fan are housed in the freezer compartment, and the upper part of the freezing compartment has a discharge port for supplying discharged cold air to the freezing compartment, and a part of the discharged cold air is passed through a passage formed in the partition wall to the freezer compartment. A discharge duct leading to the refrigerator compartment is provided, and a return duct that communicates the refrigerator compartment and the heat exchange chamber and a heater that heats the return cold air are embedded in the insulation back wall of the insulation box, and the return duct A refrigerator-freezer characterized in that a heater for heating the return cold air discharged from the opening is disposed near the opening on the discharge side of the refrigerator.