JP2740410B2 - Cooling storage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling storage which forms two independent refrigeration cycles.

[0002]

2. Description of the Related Art A conventional cooling storage is known, for example,
As disclosed in JP-A-43670, a system provided with one refrigeration cycle is generally used. In this case, cooling is stopped during defrosting operation, and power is supplied to a heater to perform defrosting of the cooler. However, it was not possible to avoid a rise in the internal temperature during this period.

As an improvement of the prior art, Japanese Patent Application Laid-Open No.
JP-A-210378 discloses a two-system refrigeration cycle in which a cooling operation of one refrigeration cycle is performed while a cooling operation of the other refrigeration cycle is performed. Are disclosed which reduce the differential.

[0004]

As described above, the two-stage refrigeration cycle has a remarkable rise in the internal temperature during the defrosting operation as compared with the one-stage refrigeration cycle. Although it can be avoided, it leaves a problem that the temperature in the refrigerator corresponding to the side performing the cooling operation and the temperature in the refrigerator corresponding to the side performing the defrosting operation become uneven. there were.

Further, in the above-mentioned prior art, since a propeller fan is used for cooling air circulation, the discharge amount of the cooling air from the discharge port varies depending on the rotation direction. That is,
If the fan rotates clockwise, much cool air will be discharged to the left of the discharge port.If the fan rotates counterclockwise, much cool air will be discharged to the right of the discharge port. It was not possible to eliminate the non-uniformity of the internal temperature caused by the rotation direction of the chamber.

Further, in this technique, the refrigerating capacity of the compressor is changed in synchronization with the inverter frequency by PID control based on the temperature detected by the temperature sensor. However, it is impossible to accurately detect the discharge cool air temperature, the response of the control of the refrigerating capacity is deteriorated, and there is a problem that the temperature in the refrigerator greatly overshoots the set temperature.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has as its object to provide a cooling storage for eliminating non-uniformity in the internal temperature and preventing overshooting of the internal temperature with respect to a set temperature. is there.

[0008]

As means for achieving the above object, two independent refrigeration cycles are formed, and the evaporators of the respective refrigeration cycles and the mutual refrigeration provided corresponding to the evaporators are formed. Equipped with a cooling air circulation fan that rotates in the same direction, a cooling unit provided in the upper part of the storage,
A cover plate that covers the cooling unit and that has a suction port facing each fan, and a cool air passage that is continuous with the cover plate and that is spaced from the inner back wall and has an outlet at the lower end. The formed back plate and a pair of shunts provided in the cool air passage and diverted to the cooling unit side in a defrosting operation state and individually mounted at an appropriate mounting angle corresponding to each cooling unit. An object of the present invention is to provide a cooling storage comprising a plate and a temperature sensor provided at an intersecting position on an extension of the flow dividing plate.

[0009]

According to the cooling storage of the present invention, a part of the cool air discharged from the cooling unit (9) or (10) performing the cooling operation is divided into the distribution plate (31A) or (32A).
Cooling unit (1) performing defrosting operation by the action of
0) or (9), as a result, it is possible to eliminate the non-uniformity of the temperature distribution in the refrigerator, and furthermore, the flow dividing plate (31A) and (3)
By making the mounting angle of 2A) different, it is possible to eliminate the variation in the discharge amount of the discharge cool air caused by the rotation direction of the fans (12) and (20).

Further, since a temperature sensor is provided at an intersecting position on the extension of the flow dividing plates (31B) and (32A), the cool air discharged from the cooling units (9) and (10) reaches the temperature sensor without being disturbed. An accurate discharge cool air temperature can be detected.

[0011]

FIG. 1 is a front view of an essential part showing an internal structure of a cooling storage according to the present invention, and FIG. 2 is a longitudinal sectional view of an essential part of the cooling storage. FIG. Body (2)
A storage main body having a heat insulating structure provided with a main body (1).
A first condensing unit (3) and a second condensing unit (4) constituting two independent refrigeration cycles are installed on the upper outer wall of the refrigerator, and these units (3), (3) 4) comprises an electric compressor (5), a condenser (6), a condenser air cooling fan (7) and the like.

On the other hand, in the upper rear portion of the storage (8),
A first cooling unit (9) that forms one refrigeration cycle together with the condensing unit (3), and a second cooling unit (10) that forms the other refrigeration cycle together with the second condensing unit (4). And side by side. The first cooling unit (9) includes a first evaporator (11)
And a propeller fan (12) for circulating a first cold air installed in front of the fan (12). It is covered with a first cooling cover (15) formed with 14), a first defrost heater (16) is provided below the evaporator (11), and a body (1) is further provided below the heater (16). A tray (18) for guiding defrost water is disposed in a drain passage (17) formed along the rear wall. On the other hand, the second cooling unit (10) is provided with a second evaporator (19) and a propeller fan (20) installed in front of the second evaporator and rotating in the same direction as the first propeller fan (12). )
These are covered by a second cooling cover (23) forming an air inlet (21) in front of the fan (20) and an outlet (22) below the rear of the evaporator (19). Below the (19), a second defrost heater (2
4), and a defrost water receiving tray is provided below the heater (24) although not shown.

The first and second cooling units (9) and (10) are PID-controlled by a temperature sensor (34) for detecting the temperature of the discharged cool air. Thus, the first and second cooling units (9) and (10) are arranged in a space (26) communicating with each other by a unit cover (25) covering them. Unit cover (2
5) forms a large number of suction ports (27) facing the fans (12) and (20) in front of the suction ports (13) and (21) upstream of the suction ports (13) and (21), and forms a cooling cover (15). ), (23), a cover plate (25A) extending rearward with a space therebetween, and a rear end extending from the rear end of the cover plate (25A) and extending downward with a space from the inner back wall. Exit (14), (2
A rear plate (25B) forming a rear cold air passage (28) communicating with the air outlet (2) and forming an air outlet (29A) at a lower end located downstream of the air outlets (14) and (22); 25A) and the rear side plate (25B) extend forward from both ends of the back plate (25B) with an interval to the inner wall of the refrigerator, and the outlets (14), (2)
2), a pair of side plates (2) having a side cold air passage (30) communicating therewith, and an outlet (29B) formed at a front end and a lower end.
5C).

Further, in the rear cool air passage (28), cool air discharged from the outlets (14) and (22) is uniformly introduced into the storage (8) from substantially the entire area of the outlet (29A) of the unit cover (25). The first cooling unit (9) to be blown out
And three second distribution plates (32A), (32B) and (32B) corresponding to the second cooling unit (10) and three first distribution plates (31A), (31B) and (31C) corresponding to 32
C) is attached to the back wall of the refrigerator, and among these, the first and second middle flow dividing plates (31B) and the first and second internal flow dividing plates (31A) and (32A) located on the inner side, and (3
2B) is inclined lower inward of the refrigerator, and has upper ends of the first and second internal distribution plates (31A) and (32A) and the first middle distribution plate (3).
1B) are at the corresponding outlets (14) and (2)
1) and 2, which are arranged close to 2) and located outside
The outer diverter plates (31C) and (32C) are inclined low outside the refrigerator. Further, when the rotation direction of each of the propeller fans (12) and (20) is determined to be clockwise in advance, the first internal flow dividing plate (31A) and the first middle flow dividing plate (31)
The inclination angle of B) is more gently inclined than the inclination angles of the second internal distribution plate (32A) and the second intermediate distribution plate (32B), whereby the first internal distribution plate (31A) and the first medium distribution plate (32A) are inclined. The upper end of the flow dividing plate (31B) is deeply inserted in the horizontal direction of the outlet (14) of the first cooling cover (15), and is positioned so as to take in a large amount of cool air discharged from the outlet (14). The upper ends of the second inner distribution plate (32A) and the second middle distribution plate (32B) are made to enter shallowly with respect to the horizontal direction of the outlet (22) of the second cooling cover (23), and the outlet (22) Position to take in the cool air discharged from the air.

The cold air discharged from the outlets (14) and (22) also enters the side cool air passage (30) from the outlet (29B) of the unit cover (25) in the horizontal and vertical directions of the storage (8). A plurality of diverter plates (3
3) is attached to the inner wall of the refrigerator. The temperature sensor (34) is provided at a position where an extension of the first middle flow dividing plate (31B) and the second inner flow dividing plate (32A) intersect, and the first middle flow dividing plate (31B) The second internal distribution plate (32A) is provided at a position to directly receive the discharged cool air.

In the above configuration, the respective refrigerating cycles are operated alternately to cool the food in the storage (8). At this time, the cooling air circulation operation is as shown by the arrow in FIG. The food is cooled uniformly by being blown out evenly in the refrigerator (8). The defrosting operation is controlled so that the operation is automatically stopped after the defrosting operation is performed for a predetermined time (30 minutes to 60 minutes) by a timer (not shown). The necessity of defrosting is controlled by providing a sensor (not shown) for detecting frost on the evaporator (11) or by performing a cooling operation for a predetermined time and then performing a defrosting operation.

As described above, the cooling units (9) and (10) are operated alternately. However, when it is desired to quickly lower the temperature to a predetermined temperature, both cooling units (9) and (10) are operated.
By operating (10) simultaneously, rapid cooling can be achieved. By the way, according to the present invention in which one of the refrigeration cycles is stopped to perform the defrosting operation and the other refrigeration cycle is to perform the cooling operation, for example, the second propeller fan (20) stops. When the second defrost heater (24) is energized to perform the defrosting operation of the second evaporator (19), the first cooling unit in which the first propeller fan (12) operates to perform the cooling operation (9)
The cool air heat-exchanged in the first evaporator (11) flows from the outlet (14) of the first cooling cover (15) to the rear cool air passage (28).
The discharged cool air passes through a rear cool air passage (28) and a side cool air passage (30), and is discharged to respective outlets (29).
A) and (29B) are blown into the storage (8).

At this time, the first internal distribution plate (31A) and the first
The middle shunt plate (31B) converts the discharged cool air blown out from the outlet (14) of the first cooling cover (15) into an arrow (A) in FIG.
As shown in the figure, the refrigerant is diverted to the side of the second cooling unit (10) performing the defrosting operation, and a part of the discharged cool air is positively directed toward the cool air passage (28) corresponding to the second cooling unit (10). It acts to lead the way. As a result, the cold air blowout from the outlet (29A) of the unit cover (25) is eliminated, and the cool air can be blown into the storage (8) from substantially the entire area of the outlet (29A).

On the other hand, when the first cooling unit (9) is performing a defrosting operation and the second cooling unit (10) is performing a cooling operation, as shown by an arrow (B) in FIG. , A second internal shunt plate (32A) and a second medium shunt plate (32B)
Of the second cooling cover (23) by the action of
The cool air discharged from 2) is positively guided in the direction of the cool air passage (28) corresponding to the first cooling unit (9). As a result, the partial cool air is blown out from the outlet (29A) in the same manner as described above. Thus, the cool air can be blown into the storage (8) from almost the entire area of the outlet (29A).

Further, as described above, the first middle flow dividing plate (31)
At a position where the extension line of B) and the extension line of the second internal distribution plate (32A) intersect, a temperature sensor (34) is provided.
Even if the first cooling unit (9) or the second cooling unit (10) performs the defrosting operation, the cooling air discharged from the other cooling unit (9) or (10) during the cooling operation is discharged. Among them, the coolest air having the lowest temperature hits the temperature sensor (34), so that the temperature of the discharged cool air can be detected more accurately.

Since the rotation directions of the first and second propeller fans (12) and (20) are clockwise, the air outlet (14) of the first cooling cover (15) and the second
The discharged cool air blown out from the outlet (22) of the cooling cover (23) is largely discharged to the left. That is, when the first cooling unit (9) is performing the cooling operation, the amount of cold air discharged from the outlet (14) increases in the outside direction of the refrigerator, and the second cooling unit (10) performs the cooling operation. When performing, the discharge amount of cool air from the outlet (22) increases in the in-compartment direction.

Therefore, when the first cooling unit (9) is in the cooling operation state, the first internal distribution plate (31A) and the first medium distribution plate (31B) that have entered deeply in the horizontal direction of the outlet (14). ), The cool air discharged from the outlet (14) is transferred to the cool air passage (2) corresponding to the second cooling unit (10).
8), the variation in the cool air discharge amount of the first cooling unit (9) due to the rotation direction of the first propeller fan (12) is corrected, and as a result, the blowing of the unit cover (25) is performed. This is to remarkably eliminate the variation in the amount of discharged cold air from the outlet (29A) by one layer.

On the other hand, when the second cooling unit (10) is in the cooling operation state, the second internal distribution plate (32A) and the second medium distribution plate (32B) which enter the air outlet (22) shallowly in the horizontal direction. ), The cool air discharged from the outlet (22) is transferred to the cool air passage (28) corresponding to the first cooling unit (9).
To the second cooling unit (1) caused by the rotation direction of the second propeller fan (20).
The variation of the cool air discharge amount of 0) is corrected, and as a result, the dispersion of the cool air discharge amount from the outlet (29A) of the unit cover (25) is more remarkably eliminated.

Furthermore, since the temperature of the discharged cold air can be accurately detected by the temperature sensor by eliminating the variation in the discharged amount of the cooled air, the cooling units (9) and (1)
0) can be controlled accurately. In the embodiment of the present invention, the rotation of the first and second propeller fans (12) and (20) is clockwise. However, when the rotation is counterclockwise, the first internal flow dividing plate ( 31A) and the angle of inclination of the first middle flow dividing plate (31B), the second internal flow dividing plate (32A).
And, by making the inclination angle of the second middle flow dividing plate (32B) gentle, the same operation and effect as those of the embodiment are exhibited.

Further, as for the mounting position of the temperature sensor (34), as long as the extension line of the first flow dividing plate (31) and the extension line of the second flow dividing plate (32) intersect, the same effect as in the above-described embodiment is obtained. It demonstrates.

[0026]

As described above, according to the present invention, when one of the cooling units performs the cooling operation, the other cooling unit performs the defrosting operation. Can be prevented, and part of the cool air discharged from the cooling unit performing the cooling operation can be prevented.
Since the flow dividing plate that guides to the cool air passage on the side of the cooling unit performing the defrosting operation is provided in the cool air passage corresponding to each cooling unit, the bias of the blown cool air is prevented, and the cool air flows into the storage from almost the entire area of the outlet. Can be blown out,
Variations in the amount of cold air discharge caused by the rotation directions of the first and second propeller fans for cooling air rotating in the same direction can be corrected by changing the mounting angle of the flow dividing plate. This has a remarkable advantage that an extreme variation in temperature distribution of the internal temperature can be eliminated.

Furthermore, since the accurate temperature of the discharged cool air can be detected, there is a remarkable advantage that the cooling unit can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is a front view of an essential part showing an internal structure of a cooling storage according to the present invention.

FIG. 2 is a vertical sectional side view of a main part of the cooling storage of the present invention.

[Explanation of symbols]

 (9) First cooling unit (10) Second cooling unit (11) First evaporator (12) First cool air circulation fan (19) Second evaporator (20) Second cool air circulation fan (25) Unit Cover (25A) Cover plate (25B) Back plate (27) Suction port (28) Cold air passage (29A) Outlet (31A) First internal shunt plate (32A) Second internal shunt plate (34) Temperature sensor

Claims (1)

(57) [Claims] 1. A refrigeration cycle comprising two independent systems, each comprising an evaporator of each refrigeration cycle and a cool air circulation fan provided corresponding to the evaporator and rotating in the same direction. A cooling unit provided at the top,
A cover plate that covers the cooling unit and that has a suction port facing each fan, and a cool air passage that is continuous with the cover plate and that is spaced from the inner back wall and has an outlet at the lower end. The formed back plate and a pair of shunts provided in the cool air passage and diverted to the cooling unit side in a defrosting operation state and individually mounted at an appropriate mounting angle corresponding to each cooling unit. A cooling storage, comprising: a plate; and a temperature sensor provided at an intersecting position on an extension of the flow dividing plate.