JPS6219669B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator that cools a storage compartment with a forced circulation cold air flow, and the object thereof is to increase the flow rate of the air curtain when the door is opened to reduce the intrusion of outside air into the storage compartment. Moreover, the purpose is to reduce the flow rate of the air curtain after closing the door to quickly return the storage chamber to a predetermined temperature.

Embodiments of the present invention will be described below with reference to the drawings. Reference numeral 1 denotes a so-called reach-in type refrigerator, the main body of which is composed of a heat insulating wall 2 with an opening 3 for storing and taking out products in the front. Two heat insulating columns 4A and 4B are erected at equal intervals in the opening to divide the opening 3 into three compartments 3A, 3B, and 3C, and three double-panel transparent panels are used to open and close these three compartments. Doors 5A, 5B, and 5C are arranged side by side on the front. Of these three doors, two doors 5B and 5C are pivoted to the main body via hinges 6B and 6C on the upper and lower right ends, and the remaining door 5A is pivoted to the main body via hinges 6A on the upper and lower left ends. As shown in Figure 3, the door 5B,
Doors 5C open in the direction of arrow H and close in the direction of arrow H', and door 5A opens in the direction of arrow M and closes in the direction of arrow M'. 7 is the ceiling wall 2 of the insulation wall
A partition plate is placed at an appropriate distance from the inner wall of the back wall 2B. Due to the partition plate, a plurality of shelves 8, a wire bottom 9, and the left and right side walls 2C, 2D are installed in the refrigerator. A storage room 11 equipped with a fluorescent light 10
and two axial blowers 15A, 1 supported by a plate fin type cooler 12 equipped with a defrosting heater 13 on the air inlet side and a fan case 14.
5B, a cold air outlet 17 opening at the upper front of the storage chamber, and a cold air suction opening 18 opening at the lower rear of the storage chamber. The partition plate is made of a metal plate, and the ceiling wall 7
A, a back wall 7B orthogonal to this ceiling wall, and a plurality of through holes 19, 19 that are inclined backward and downward at the upper part of this back wall.
It is integrally formed by bending the inclined part 7C which is perforated in the horizontal direction. Each of the blowers 15A, 15
As shown in FIG. 3, the propeller 15a is positioned at the opening 14A of the fan case 14, and the motor 15b is positioned opposite to the inclined portion 7C. death,
A high pressure chamber 1 is defined on the downstream side of the cooler 12 in the cold air passage 16 by this inclined portion and the fan case 14.
It is housed in 6A. Moreover, the cooler 12
Its center is on the left side of the center of the insulation wall 2, that is, the door 5A
It is installed so that it is biased to the side. 16B is a piping space defined between the cooler 12 and the right side wall 2D of the heat insulating wall when the cooler 12 is installed, in which a low pressure liquid pipe 22 equipped with an expansion valve 21 and a low pressure gas pipe 2 are provided.
3 is stored.

Reference numeral 24 denotes a machine room formed at the bottom of the main body, in which a refrigerant compressor 25, a condenser 26, a blower 27, and a drainage tank 28, which together with the cooler constitute a refrigeration cycle, are installed. 29 is the bottom wall 2E of the insulation wall 2
A drain pipe provided through the drain pipe leads the dew from the cooler 12 to the drain tank 28.

Next, cold air circulation in the refrigerator 1 will be explained.

During the cooling operation, the cold air that has been heat exchanged in the cooler 12 is forcedly circulated by the blowers 15A and 15B as shown by the arrows in FIG. Cooling. During this circulation, the cold air flowing into the high-pressure chamber 16A is partially diverted through the through holes 19, 19 of the inclined portion 7C, and this divided cold air crosses the upper part of the storage chamber 11, cooling the products and creating an air curtain. Absorbed by CA.

The flow rate of this divided cold air is for each door 5A, 5B,
Determined by opening and closing of 5C. That is, each blower 1
When forcedly circulating cold air with 5A and 15B,
When all the doors are closed and the opening 3 is closed, the storage room 11 is in a sealed state, so no dynamic pressure loss occurs in each of the blowers 15A and 15B, and the storage room 11 is closed.
The pressure is higher than that outside and an equilibrium state is maintained. Therefore, the flow path resistance of the air outlet 17 is greater than when the door is open, and as a result, the static pressure of the cold air at the inclined portion 7C becomes higher. Therefore, the flow rate of cold air supplied to the storage chamber 11 from the through holes 19, 19 increases, and the flow rate of cold air blown out from the blow-off port 17 to form the air curtain CA decreases.

Furthermore, when all or one or two of the doors are opened, a portion of the dynamic pressure obtained by operating the blowers 15A and 15B escapes to the outside through the opening 3, resulting in a dynamic pressure loss. Therefore, the pressure in the storage chamber 11 is approximately the same as that outside the room, resulting in an unbalanced state, and the flow path resistance that the outlet 17 receives is small.
In other words, the static pressure of the cold air at the inclined portion 7C becomes low. Therefore, the flow rate of cold air supplied to the storage chamber 11 from the through holes 19, 19 decreases, and the air curtain CA
The flow rate of cold air increases.

If the cooler 12 becomes clogged with frost as the cooling operation by this cold air circulation progresses, a defrosting operation is started. During this defrosting operation, compressor 25, condenser 2
6 and both blowers 15A, 15B, and 27 are stopped, the defrosting heater 13 is energized, and the frost in the cooler 12 is removed by the defrosting heater.

According to such a configuration, pressure changes in the storage chamber 11 and changes in the high pressure chamber 1 occur as the doors 5A, 5B, and 5C open and close.
When the static pressure of cold air changes at 6A, the holes 19, 19 act to increase or decrease the flow rate of the cold air forming the air curtain CA, so when the door is opened, the flow rate of the air curtain CA is increased and stored. Room 1
It is possible to reduce the amount of outside air entering into the storage compartment 1, and to increase the flow rate of cold air blown into the storage compartment 11 from the ventilation holes 19, 19 after closing the door, so that the storage compartment 11 can quickly return to a predetermined temperature. . Also, blower 15
Since A and 15A are housed in the high pressure chamber 16A downstream of the cooler 12 in the cold air passage 16, they are constantly exposed to low-temperature cold air with low humidity during cooling operation, and also due to the high dynamic pressure of the blower itself. In addition, since it is supported by the fan case 14, the cold air passage 16 during defrosting operation can be prevented from condensation.
It is possible to avoid condensation, freezing due to the dew condensation, and failure due to overheating of the motor 15b due to the warm air.

As described above, the present invention comprises a main body composed of an insulating wall equipped with a door that can open and close the front opening, and a partition plate is arranged at an appropriate distance from the inner wall of the insulating wall to form a storage room. In a refrigerator that forms a cold air passage in which a cooler and a blower are installed, and an air outlet located at the upper front of the storage compartment, and forms an air curtain in front of the storage compartment by a forced circulation cold air flow to cool the storage compartment. A fan case supporting the blower is attached to the rear surface of the back wall of the partition plate to define a high pressure chamber in which the blower is housed downstream of the cooler in the cold air passage, and serves as the front wall of the high pressure chamber and receives the static pressure of the blower. It is characterized by the fact that a plurality of holes are formed in the back wall to communicate the high pressure room and the storage room, so when the door is opened, the flow rate of cold air forming the air curtain is increased compared to when the door is closed, and the flow rate is increased to flow into the storage room. The amount of outside air intrusion can be reduced,
Furthermore, the flow rate of cold air blown into the storage room from the vent after the door is closed is increased compared to when the door is opened, so that the storage room can quickly return to a predetermined temperature, and furthermore, condensation on the blower can be effectively prevented.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an embodiment of the refrigerator of the present invention;
2 is a sectional view taken along the line A-A' in FIG. 1, FIG. 3 is a sectional view taken along the line BB' in FIG. 2, and FIG. 4 is an enlarged view of FIG. 2C. 2...Insulating wall, 3...Opening, 5A, 5B, 5C
... Door, 7 ... Partition board, 7b ... Back wall, 11 ...
Storage room, 12... Cooler, 14... Fan case, 15A, 15B... Blower, 16... Cold air passage, 16A... High pressure chamber, 17... Air outlet, 19,
19...Through hole, CA...Air curtain.

Claims (1)

[Claims] 1 The main body is composed of an insulating wall equipped with a door that can open and close the front opening, and partition plates are arranged at appropriate intervals from the inner wall of the insulating wall to connect the storage room, cooler, and blower. In a refrigerator that cools the storage compartment by forming a cold air passage installed therein and an air outlet located at the upper front of the storage compartment, and forming an air curtain by forced circulation cold air flow at the front of the storage compartment, A fan case that supports the blower is attached to the back of the wall to define a high pressure chamber in which the blower is housed downstream of the cooler in the cold air passage, and a high pressure chamber is formed on the back wall that serves as the front wall of the high pressure chamber and receives the static pressure of the blower. A refrigerator characterized in that a plurality of through holes are formed to communicate between the refrigerator and the storage chamber.