JPH0510653A - Refrigerator - Google Patents

Abstract

PURPOSE:To restrict the temperature rise in a refrigerator during a defrosting operation as much as possible. CONSTITUTION:As a defrosting operation is started, a blower fan 62 is stopped, and indoor fans 30a, 30b are operated. A hog gas valve 57 is opened and an evaporator 51 is heated, thereby hot air is not blown toward an outer circumference of a storing box 20 but frosting of the evaporator 51 is removed (the first defrosting period), the blower fan 62 is operated after the first defrosting period and at the same time the evaporator 51 is heated to blow the hot air against the outer circumference of the storing box 20 so as to remove frost adhered to the storing box 20 (the second defrosting period). At this time, the indoor fans 30a, 30b are stopped and a positive heat exchanging with the wall part of the storing box 20 is avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and in particular,
The present invention relates to a defrosting control of a refrigerator in which cooling air is circulated around the storage box to indirectly cool the inside of the storage box.

[0002]

2. Description of the Related Art Conventionally, as a refrigerator of this type, Japanese Patent Laid-Open No.
The ones disclosed in JP-A-3-185359 and JP-A-2-157576 are known.

The former one has a refrigerator main body in which a plurality of independent storage boxes are arranged in a heat insulating box with a predetermined air flow circulation passage, and an evaporator is installed between the heat insulating box and the storage box. A cooling mechanism that opens a bypass path at a predetermined time to directly connect the evaporator and the compressor, a blower fan that blows air so that the air passes through the evaporator in the air flow circulation passage, and a predetermined close contact with the ceiling portion of the storage box. On the basis of the detection result of the thermo-sensor, the defrosting control means for opening the bypass path in the cooling mechanism to directly connect the evaporator and the compressor is configured.

In such a structure, when the cooling fan blows the air cooled by the evaporator to the outer circumference of the storage box,
The air in the storage box is cooled through the wall material of the storage box,
The perishables and the like stored in each storage box are indirectly cooled. Further, when frost adheres, the defrost control means opens the bypass path in the cooling mechanism to directly connect the evaporator and the compressor based on the detection result of the thermosensor, so that a high-temperature compressed refrigerant is present in the evaporator. It is introduced and hot air is blown to the outer circumference of the storage box to melt the frost.

In the latter, one storage box is arranged in the heat insulation box, and a convection fan is provided in the storage box to blow downward cooling air upward for convection. Has been done.

Also in this case, the perishable fan blows upwardly the cool air that has been stored in the storage box indirectly, and the cool air that tends to stay downward in the storage box in the natural state. This allows the air in the storage box to circulate,
When air flows along the wall material of the storage box, heat is actively exchanged to enhance the cooling effect and make the temperature uniform.

[0007]

In the former refrigerator described above, when the frost is removed, the evaporator heats the air in the air flow circulation passage, and based on the detection result of the thermosensor provided in the ceiling portion of the storage box. Since the heated air was circulated in the airflow circulation path until the frost on the same part was removed, the inside of the storage box was warmed from the part where frost did not adhere to the storage box, and the temperature inside the storage room increased more than necessary. There was a problem that it would end up.

On the other hand, such a refrigerator that indirectly cools the inside of the storage box is characterized in that the inside of the storage box is maintained at high humidity, and in particular, like the latter, the air in the storage is blown. It has been found that it is suitable for thawing a large frozen product when it is circulated. However, when air is circulated, heat exchange with the wall material of the storage box is promoted, and when the former defrosting is performed, the temperature inside the storage box rises significantly.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a refrigerator capable of suppressing an increase in internal temperature during defrosting as much as possible.

[0010]

In order to achieve the above object, the invention according to claim 1 is to dispose a storage box made of a heat conducting member in the heat insulation box, and to arrange the inner wall of the heat insulation box and the storage box. The refrigerator main body having an air flow circulation passage formed between the outer wall and the outer wall, a heat exchange mechanism for cooling and heating a heat exchanger arranged in the air flow circulation passage, and the air in the air flow circulation passage A blower mechanism that circulates through a heat exchanger, a temperature control unit that includes a temperature sensor to control the cooling operation of the heat exchange mechanism so that the temperature in the storage box is within a predetermined range, and the refrigerator body. The internal fan that circulates the internal air in the storage box and the internal fan that stops the blower mechanism at a predetermined time and activates the internal fan, and heats the heat exchanger of the heat exchange mechanism to perform the heat exchange. The first defrost period to defrost the vessel A second defrosting period in which the blower mechanism is operated and the internal fan is stopped after the first defrosting period, and the heat exchanger of the heat exchange mechanism is heated to defrost the storage box. And a defrost control means having

The invention according to claim 2 provides the invention according to claim 1.
In the refrigerator according to claim 1, the storage box is provided with a partition made of a heat-conductive member that partitions the storage box into small chambers, and the internal fan is installed in the small chamber formed by the partition to defrost the box. Is formed.

[0012]

In the invention according to claim 1 configured as described above, the heat exchanger of the heat exchange mechanism is heated at the time of defrosting, but during the first defrosting period, the inside of the air flow circulation passage in the refrigerator body is The ventilation mechanism that circulates the air is stopped, the heat exchanger is warmed to remove frost, and the air warmed by this heat exchanger is prevented from flowing around the storage box, while the internal fan is operated to control the temperature. Avoid unevenness in

Further, in the second defrosting period following the first defrosting period, the heat exchanger of the heat exchange mechanism is heated and the blower mechanism is operated, and the heat exchanger causes the air in the air flow circulation passage to move. To melt the frost in the storage box, but at this time, stop the internal fan to prevent positive heat exchange from the wall material of the storage box to be warmed.

Next, in the invention according to claim 2 configured as described above, the inside of the storage box is partitioned into a small chamber by a partition wall made of a heat conducting member, and an internal fan is installed in the small chamber to defrost the box. The inside of the thaw box is cooled by the cold heat of the frozen mass stored in the thaw box by operating the internal fan during the first defrosting period, and other Cool the small room. Then, in the second defrosting period, the inside fan is stopped so that the inside of the refrigerator is not overheated by the hot air outside the storage box.

[0015]

As described above, according to the present invention, a refrigerator capable of suppressing the temperature rise in the refrigerator as much as possible by controlling the blower mechanism and the operating state of the refrigerator fan in combination during defrosting. Can be provided.

According to the second aspect of the present invention, the inside of the storage box can be cooled as much as possible even during defrosting by the cold heat of the frozen mass stored in the defrosting box.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a front view of a refrigerator according to an embodiment of the present invention, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partially cutaway top view.

In the figure, the refrigerator main body comprises a heat insulating box 10 and a storage box 20, and the heat insulating box 10 has a heat insulating material 1 such as urethane foam between the inner wall of the outer box 11 and the outer wall of the inner box 12.
3 is filled, and a pair of left and right openings 1 is provided on the front surface.
4a and 14b are formed and the openings 14a and 1 are formed.
Insulating doors 15a and 15b for opening and closing 4b are attached by hinges so as to be opened and closed.

The storage box 20 is formed of a metal plate material such as stainless steel, which is a heat conducting member, in the form of a housing having an opening 21 on one surface thereof.
Both of the openings 14a and 14b are aligned as desired, and are fixedly supported on the outer peripheral edge of the inner surface of the front wall of the heat insulating box 10. At this time, the left and right side walls 22, 23, the upper wall 24, the bottom wall 25, and the rear wall 26 of the storage box 20 are held at a predetermined distance from the inner wall of the inner box 12 in the heat insulating box 10, and the gap is maintained by the air flow. A circulation passage W is formed.

In the storage box 20, a partition wall 27 made of a metal plate made of stainless steel, which is a heat conducting member, is fixed to the upper wall 24 and the bottom wall 25 of the storage box 20 at the upper side and the lower side, respectively. The inside is divided into a room RM1 on the right side in the figure and a room RM2 (defrosting box) on the left side in the figure. The partition 27 and the storage box 20 are the same.
And do not necessarily have to be hermetically sealed. Further, in this embodiment, the partition wall 27 is formed of a flat plate, but it may be formed of a plate material having a large surface area such as a corrugated plate to improve the heat exchange efficiency.

Each of the two internal fans 30a and 30b is constructed by fixing the fan 32 to the rotation axis of the fan motor 31, and is attached to the left side wall 22 via a supporting member so as to face the partition wall 27. Has been. A cover 40 for forming an air flow path is attached to the front surfaces of the internal fans 30a and 30b. The cover 40 has an exhaust port 41 formed in a portion facing the fan 32 and a lower portion. A suction port 42 is formed in the.
That is, the upper side end of the cover 40 contacts the upper wall 24, the left side end bent to have an L-shaped cross section contacts the left side wall 22 of the storage box, and the right side end of the cover 40 rear wall. 26
And the lower side forms the suction port 42 with a predetermined gap from the left side wall 22.

The left side wall 2 of the storage box 20 in the heat insulating box 10
An evaporator 51 of a cooling mechanism (heat exchange mechanism) 50 is fixed to the wall portion facing 2 with its air flow path oriented vertically, and between the evaporator 51 and the left side wall 22 of the storage box 20. Has an air circulation hole 61 formed in the upper part thereof, and a blower fan (blower mechanism) 62 is provided in the air circulation hole 61.
The shield plate 60 in which is disposed is fixed by its upper piece so as to hang from the upper wall of the inner box 12 in the heat insulating box 10.
A sufficient gap is formed between the lower side of the shielding plate 60 and the lower wall of the inner box 12, and the evaporator 51 is removed from the gap.
An air cooling flow path communicating with the upper air circulation hole 61 via the air flow path is formed.

As shown in FIG. 4, the cooling mechanism 50 includes a compressor 52 for compressing a refrigerant, a condenser 54 for condensing the compressed compressed refrigerant under the action of air cooling by an air cooling fan 53, and a condensing condenser. A dryer 55 that dehumidifies the refrigerant, a capillary tube 56 that converts the dehumidified condensed refrigerant into a low-temperature low-pressure refrigerant, and an evaporator that cools by the heat of vaporization of the low-temperature low-pressure refrigerant and supplies the vaporized refrigerant to the compressor 52. 51 and is housed in an auxiliary box 10a formed on the left side of the heat insulating box 10 except for the evaporator 51.

A hot gas valve 57 is interposed between the output side of the compressor 52 and the input side of the evaporator 51. When the hot gas valve 57 is opened, the hot compressed refrigerant compressed by the compressor 52 is compressed. Is the evaporator 5
1 to heat the evaporator 51. The hot gas valve 57 opens when energized and closes when de-energized.

The compressor 52 is the compressor motor 5
2a and a compression mechanism 52b that is driven by being connected to the rotation axis of the compressor motor 52a,
The drive of the compressor motor 52a is controlled by an electric control circuit 70 (temperature control means, defrost control means) as shown in FIG.

The electric control circuit 70 is connected to a commercial AC power source, and a main power switch 72 for opening and closing the commercial AC power source and the internal power supply paths PW1 and PW2, and an internal temperature T1 in the room RM1 are set upper limits. A series circuit S1 in which an exciting coil of a relay R1 is connected in series to a temperature sensor Th1 that conducts when the temperature becomes equal to or higher than a temperature TH, and a lower limit temperature set in the refrigerator temperature T1.
A series circuit S2 in which an exciting coil of a relay R3 is connected in series to a temperature sensor Th2 that conducts when the temperature falls below TL,
Exciting coil self-holding circuit S in relay R2 and relay R4 including forced release circuits R4-3 and R2-3, respectively.
3, S4, an operation control circuit S5 that includes a cam timer TM to control the cooling operation and the defrosting operation, and the power supply paths PW1 and PW2
In between, make contacts R5-1 and R6-of relays R5 and R6
A serial circuit S6 in which the changeover switch 34 and the internal fans 30a and 30b are connected in series to a parallel circuit in which 1 is connected in parallel.
And a series circuit S7 in which the break contact R6-2 of the relay R6 and the blower fan 62 are connected in series in the power supply paths PW1 and PW2. The changeover switch 34 is for selecting whether or not to operate the internal fans 30a and 30b. The operator 34a of the changeover switch 34 is attached to the front of the auxiliary box 10a.

Here, in the cam timer TM, the movable contact is normally connected to the first contact which is the fixed contact, and the movable contact is connected to the second contact which is the fixed contact for a predetermined time at every fixed time. That is, the cam timer TM is set to the time required to dissolve the frost adhering to the storage box 20 together with the time to start the start of defrosting, and the movable contact is the first contact while the former time is being measured. After the time measurement is completed, the movable contact is connected to the second contact to measure the latter time, and when the simultaneous measurement is completed, the movable contact is switched to the first contact to restart the former time measurement.

The operation control circuit S5, to which the cam timer TM is connected, performs the cooling operation when the movable contact of the cam timer TM connected to the power supply path PW2 is connected to the first contact, and at the same time, moves. The defrosting operation is performed when the contact is connected to the second contact.
The make contact R2-2 of the relay R2, the break contact R4-2 of the relay R4, and the compressor motor 5 are connected between 1 and PW2.
2a are connected in series, and the first contact of the cam timer TM, the air-cooling fan 53 and the make contact R of the relay R2 are connected.
2-2 and the break contact R4-2 of the relay R4 are connected in series, and the first contact of the cam timer TM and the relay R5.
Exciting coils are connected in series. In addition, relay R2
Make contact R2-2 and break contact R4 of relay R4
The make contact point R6-3 of the relay R6 serving as a bypass path is connected in parallel to the series circuit of -2.

On the other hand, regarding the defrosting operation, the second contact of the cam timer TM and the hot gas valve 57 are connected in series between the power supply paths PW1 and PW2.
Similarly, the second contact of the cam timer TM and the temperature sensor Th3 which becomes non-conductive when the temperature of the evaporator 51 becomes equal to or higher than the set heating temperature TE and the exciting coil of the relay R6 are connected in series.

The temperature sensors Th1 and Th2 are mounted above the chamber RM1, respectively.
3 is connected to the evaporator 51.

Next, the operation of this embodiment having the above configuration will be described. After installing the refrigerator, the operator 34a of the changeover switch 34 is operated to select whether the room RM2 is for thawing or refrigerating. That is, when the operator 34a is operated to make the changeover switch 34 conductive, the internal fans 30a and 30b circulate the air inside the case to make the chamber RM2 a forced convection chamber suitable for thawing, and vice versa. When 34 is made non-conductive, the internal fans 30a and 30b do not operate, and the inside of the chamber RM2 becomes a natural convection chamber suitable for refrigeration.

Now, in order to make the chamber RM2 a natural convection chamber, the changeover switch 34 is turned off and the main power switch 72
When the switch is turned on, the internal temperature T1 is equal to or higher than the set upper limit temperature TH, so that the temperature sensor Th1 conducts and the relay R1
Energize the excitation coil of. Then, the make contacts R1-1 and R1-2 in the self-holding circuit S3 of the relay R2.
Is turned on, and the exciting coil of the relay R2 is energized, so that the make contact R2-1 is turned on to keep the relay R2 in the on state.

When the relay R2 is turned on, the make contact R2
-2 becomes conductive, the compressor motor 52a and the air-cooling fan 53 are energized via the break contact R4-2 of the relay R4, and the cooling mechanism 50 is started.

On the other hand, when the main power switch 72 is turned on, the movable contact of the cam timer TM is connected to the first contact, and the exciting coil of the relay R6 connected to the second contact is not energized. Therefore, the break contact R6
-2 is in conduction, the blower fan 62 starts blowing air, sucks air from the gap between the lower side of the shielding plate 60 and the lower wall of the inner box 12 through the air flow path of the evaporator 51, and Storage box 20 for sucking in air from air circulation hole 61
The air begins to be blown to the air flow circulation passage W formed around the.
Therefore, when the cooling mechanism 50 is started, the air sucked by the blower fan 62 is heat-exchanged when passing through the air flow path of the evaporator 51, and the cooled air is cooled by the air circulation holes 6
1 to the air flow circulation passage W formed around the storage box 20
Be blown to.

The cool air sent out from the air circulation hole 61 is the upper wall 24 of the storage box 20 and the inner box 1 of the heat insulation box 10.
It flows between the inner wall of 2 and the both wall materials are cooled. As for the wall material of the inner box 12, since the heat insulating member 13 is filled on the opposite surface, only heat exchange is performed to cool the wall material, but for the upper wall 24, the inside of the chambers RM2, RM1 Since the temperatures T2 and T1 are higher, heat exchange is positively performed via the upper wall 24.

As a result, the cold heat of the cold air flowing in the air flow circulation passage W is taken by the air in the chambers RM2, RM1.
2, the temperatures T2 and T1 in the cold storage in RM1 decrease, and the temperature of the cool air in the air flow circulation passage W increases. Also, the air flow circulation passage W
As the cool air flows through the inside, heat is exchanged through the upper wall 24, the right side wall 23, and the bottom wall 25 to cool the inside of the storage box 20. In addition, a part of the cool air flows along the rear wall 26 to cool the inside of the storage box 20.

In this way, heat is exchanged between the walls 22 to 27, the temperature inside the chamber in the chambers RM1 and RM2 gradually decreases, the temperature T1 inside the chamber falls below the set upper limit temperature TH, and the temperature sensor Th1. Even if is turned off, since the relay R2 is in the on state and is held by itself, the operation of the cooling mechanism 50 is continued.

However, when the internal temperature T1 becomes lower than the set lower limit temperature TL, the temperature sensor Th2 is turned on and the relay R3 is turned on.
Energize the excitation coil of. Then, similarly to the case of the self-holding circuit S3 described above, the relay R4 is turned on, the break contact R4-3 constituting the forced release circuit of the relay R2 is turned off, and the self-holding state of the relay R2 ends. Also, as in the case of the relay R2, the relay R4
Since the ON state of the break contact is self-maintained, the break contact R4-
2 is turned off, the make contact R2-2 is also turned off. Therefore, the compressor motor 52a and the air cooling fan 5
The power supply to 3 is stopped, and the cooling operation of the cooling mechanism 50 is released.

Thereafter, the electric control circuit 70 controls the inside temperature T1 to be maintained within the range between the set upper limit temperature TH and the set lower limit temperature TL as shown in FIG. The set upper limit temperature TH and the set lower limit temperature TL in the refrigerator are adjusted within a range of several degrees with reference to about 0 degrees Celsius.

Initially, the internal fans 30a, 30 in the room RM2
In b, since the changeover switch 34 is in the non-conducting state, make contacts R5-1 and R6-1 in the relays R5 and R6.
Not working regardless of the situation. However, at time t0
It is assumed that the frozen mass frozen at about -30 degrees Celsius is housed in the chamber RM2 for thawing, and the changeover switch 34 is turned on.

Now, the movable contact of the cam timer TM is connected to the first contact to energize the exciting coil of the relay R5, and the make contact R5-1 is conductive. Therefore, at the same time when the changeover switch 34 is turned on, the internal fan 30
The a and 30b start blowing air, and sucks the air in the compartment from the lower suction port 42 of the cover 40 and discharges it from the exhaust port 41 toward the partition wall 27. Then, the air in the chamber RM2 first flows parallel to the right direction in the drawing along the upper wall 24, and the partition wall 2
7, the direction is changed downward and flows along the partition wall 27, and then it contacts the bottom wall 25 and is changed again in the horizontal direction and flows leftward. It is sucked from the mouth 42.

The air blown by the internal fans 30a and 30b is cooled as it flows along the surface of the frozen mass, and the internal temperature T2 of the internal cold storage chamber T2 is reduced by circulating the cooled air in the chamber RM2. It drops sharply as shown by the alternate long and short dash line. At this time, when the cooled air flows along each of the walls 22 to 27, heat exchange is performed via the wall material to cool the air in the air flow circulation passage W or to remove the air in the chamber RM1. Cooling. Then, due to the cooling action by the chamber RM2 and the cooling action by the cooling mechanism 50, the inside temperature T1 in the chamber RM1 decreases, and this inside temperature T1 is set lower limit temperature TL.
As described above, the compressor motor 5
2a and the air-cooling fan 53 are de-energized so that the cooling mechanism 5
The cooling operation of 0 is canceled. However, even if the cooling operation of the cooling mechanism 50 is released, the blower fan 62 continues to blow air unless the movable contact of the cam timer TM is connected to the second contact.

When the cooling operation is canceled, the air circulating in the air flow circulation passage W is not cooled by the evaporator 51, but as described above, the air in the air flow circulation passage W does not remain due to the frozen mass. It is cooled as it flows along each wall 24, 25 around the chamber RM2. Therefore, when the frozen mass is thawed, the cold heat in the chamber RM2 is released into the air flow circulation passage W through the walls 24 and 25, so that the blower fan 62 is operated regardless of the cooling operation of the cooling mechanism 50. By placing the air through the air in the air circulation passage W, the chamber RM1
It has the effect of cooling the inside. As a result, as shown in FIG. 6, the inside temperature T in the chambers RM1 and RM2 during the thawing period.
The rise of 1 and T2 is suppressed, the temperature Tf of the frozen mass gradually rises, and the thawing proceeds.

By the way, when the main power switch 72 is turned on, since the exciting coil of the relay R6 is not energized, its break contact R6-4 is conductive and the cam timer TM is energized. Therefore, the same cam timer TM
Inside the above, the motor M rotates to start timing, and when the time when frost adheres, the movable contact is switched to the second contact.

It is assumed that the movable contact of the cam timer TM is switched to the second contact after the internal temperature T1 reaches the set lower limit temperature TL and the operation of the cooling mechanism 50 is stopped as described above.

When the movable contact is switched to the second contact,
The power supply to the air-cooling fan 53 is stopped and the relay R
The energization of the exciting coil in No. 5 is also stopped, and conversely, the energizing coil of the relay R6 is energized and the hot gas valve 5
7 is also energized.

Therefore, the make contact R5-1 interposed in the power supply path of the internal fans 30a and 30b becomes non-conducting, but instead the relay R6 is energized so that the make contact R6-1 becomes conductive. The operation of the inner fans 30a and 30b is continued. On the other hand, the break contact R of the relay R6
Since 6-2 becomes non-conductive, the blower fan 62 is stopped and the movement of air in the airflow circulation passage W is stopped.

On the other hand, a make contact R6- interposed in the power supply path for the compressor motor 52a and the air-cooling fan 53.
Since 3 is conducting, the compressor motor 52a operates,
Furthermore, since the hot gas valve 57 is energized, the hot gas valve 57 is also turned on.
Opens and sends the high-temperature compressed refrigerant compressed by the compressor 52 to the evaporator 51. Then, the evaporator 5
Since No. 1 is heated, the frost attached to the evaporator 51 gradually dissolves.

At this time, since the frozen mass is stored in the chamber RM2 and the internal fans 30a and 30b continue to operate, the internal temperature T2 does not rise so much regardless of the operation of the cooling mechanism 50. In addition, since the inside of the chamber RM1 is also cooled through the partition wall 27 by circulating the cool air in the chamber RM2, the rise in the internal temperature T1 is also gradual.

While a large amount of frost adheres to the evaporator 51, the amount of heat supplied to the evaporator 51 is consumed as the heat of frost melting, and the temperature of the evaporator 51 does not rise so much. However, when the attached frost is almost melted, the temperature of the evaporator 51 starts to rise. When the temperature of the evaporator 51 rises to the set heating temperature TE, the temperature sensor Th3 becomes non-conductive, and the exciting coil of the relay R6 is no longer energized.

Then, the make contact R6-1 interposed in series in the power supply paths of the internal fans 30a and 30b becomes non-conductive to stop the internal fans 30a and 30b, and conversely the power supply of the blower fan 62 is performed. The break contact point R6-2, which is interposed in series with the passage, becomes conductive and the blower fan 62 starts to operate.

The blower fan 62 allows the air in the air flow circulation passage W to pass through the evaporator 51 and circulates in the air flow circulation passage W, but as described above, the evaporator 5 is used.
Since the temperature of No. 1 is rising, the air in the airflow circulation passage W becomes warm air and flows around the outer circumference of the storage box 20. And
At this time, the frost attached to the storage box 20 is melted.

By the way, while the blower fan 62 starts to operate, the internal fans 30a and 30b stop operating, so that the circulation of air in the chamber RM2 is stopped. As described above, if warm air is blown to the outer circumference of the storage box 20, the temperature of the wall material rises. At this time, the internal fans 30a, 30
Since b is stopped, air is not circulated and heat exchange with the wall material having an increased temperature is suppressed. Therefore, it is possible to prevent the temperature in the refrigerator from rising to an inappropriate temperature for food storage.

The temperature of the evaporator 51 is the set heating temperature TE.
When the temperature sensor Th3 rises to the non-conductive state, the break contact R6-4 of the relay R6 interposed in the power feeding path to the cam timer TM becomes conductive, and the motor M starts operating again inside the cam timer TM to start timing. . In addition,
After the movable contact of the cam timer TM is switched to the second contact, the temperature of the evaporator 51 rises and the temperature sensor Th3
Is the first defrosting period (ST1).

The cam timer TM starts counting the time required for melting the frost adhering to the preset storage box 20 by restarting the power supply. In addition, let this time be a 2nd defrost period (ST2).

In the second defrosting period, initially the relay R
Since the make contact R6-3 of No. 6 becomes non-conductive, power is not supplied to the compressor motor 52a, but when the internal temperature T1 in the chamber RM1 gradually rises and exceeds the set upper limit temperature TH, the temperature sensor Th1 becomes conductive, As with the cooling operation, the make contact R2-2 becomes conductive and the break contact R
4-2 becomes conductive. Therefore, the compressor motor 52
Since a is supplied with power again, the operation is restarted and the evaporator 5
1 is heated and hot air is supplied into the airflow circulation passage W by the blower fan 62. Then, when the frost attached to the storage box 20 is melted, the movable contact of the cam timer TM is switched from the second contact to the first contact, and the normal cooling operation is restored.

As described above, when the defrosting operation is started when the changeover switch 34 is brought into the conducting state for thawing, the cold heat of the frozen mass is used to suppress the temperature rise in the chambers RM1 and RM2. However, when the frozen mass is not accommodated, the changeover switch 34 is in a non-conducting state and the internal fan 30a, 30b is not operated even during the first defrosting period to suppress the temperature increase in the internal compartment. .

As described above, in the present invention, the evaporator 51 is
Although the blower fan 62 was not operated during the defrosting, when the blower fan 62 and the inside fans 30a and 30b are operated during the defrosting operation, the inside temperatures T1 and T2 are reduced.
Is as shown by the broken line in FIG. 6, and rises as shown by P and Q at the end of the defrosting operation.

Although the sequence control using the cam timer TM and the temperature sensors Th1 to Th3 is performed in the above embodiment, the defrosting control and the temperature control may be performed by software control by the microcomputer.

On the other hand, in the above-described embodiment, the chamber RM2
Although the internal fans 30a and 30b are installed inside, the room RM
The internal fans 30a and 30b may be provided in the inside of the unit 1 to form a thawing chamber. Further, although the two in-compartment fans 30a and 30b are arranged above and below, it is also possible to arrange only one fan below and blow air upward. Further, the blowing direction may be directed to the partition wall 27 so as to promote heat exchange by the partition wall 27.

Further, in the above-mentioned embodiment, the inside of the storage box is divided into two, but it is also applicable to those which are not divided, and a defrosting box is arranged in the center to divide into three. The number of divisions is arbitrary. Further, the division direction is arbitrary, such as division in the vertical direction instead of division into the right and left.

[Brief description of drawings]

FIG. 1 is a front view of a refrigerator according to an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the refrigerator.

FIG. 3 is a partially cutaway top view of the refrigerator.

FIG. 4 is a diagram showing a configuration of a cooling mechanism.

FIG. 5 is a circuit diagram of an electric control circuit.

FIG. 6 is a timing chart showing a state of temperature control.

[Explanation of symbols]

10 ... Insulation box 20 ... Storage box 27 ... Partition 30a, 30b ... In-compartment fan 34 ... Changeover switch 50 ... Cooling mechanism 51 ... Evaporator 57 ... Hot gas valve 62 ... Blower fan 70 ... Electric control circuit S5 ... Operation control circuit TM ... Cam timer Th1 to Th3 ... Temperature sensor W ... Air flow circulation passage RM1, RM2 ... Room TH ... Set upper limit temperature TL ... Lower limit temperature ST1 ... First defrost period ST2 ... Second defrost period

[Procedure amendment]

[Submission date] August 24, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0001

[Correction method] Change

[Correction content]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator, and in particular,
The present invention relates to a refrigerator that indirectly cools the inside of a storage box .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

In the former refrigerator described above, cooling and defrosting of the evaporator are performed simultaneously.
The temperature inside the storage box does not rise during defrosting because it cannot be covered.
Will rise.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

On the other hand, a refrigerator for indirectly cooling the inside of the storage box
In the case of the
In particular, like the latter, it blows the air inside the cabinet to circulate it.
It is suitable for thawing large frozen foods when wrapped.
I understood. However, when defrosting the wall material,
The air in the air flow circulation passage is heated by the vibrator, and the ceiling of the storage box
Based on the detection result of the thermosensor provided in the part,
Air flow circulation passage of the same heated air until the frost on the part is removed
It will be circulated inside. Therefore, in the storage box
The frost begins to melt from the area where frost does not adhere and the wall material is warmed up.
When circulated, the circulated air promotes heat exchange with the wall of the storage box.
As it progresses, the temperature inside the storage box rises significantly. Also, the reverse
In addition, when defrosting, it is refrigerated if the air in the refrigerator is blown and circulated.
Since the air is cooled at, the frost on the inner wall of the storage box
It will be difficult to remove.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

The present invention has been made in view of the above problems, and suppresses an increase in the temperature inside the chamber during defrosting as much as possible.
The purpose of the present invention is to provide a refrigerating cabinet that can suppress the defrosting while improving the defrosting efficiency .

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

In order to achieve the above object, the invention according to claim 1 provides a heat exchanger on the outer circumference of a storage box.
Refrigerator that blows air cooled by the inside to cool the inside of the storage box
In the cabinet, heat the heat exchanger at a specified time to defrost it.
Heat exchanger defrosting mechanism and the air inside the storage box
A circulation fan to circulate and a frozen product is stored in the storage box.
And the heat exchanger defrosting mechanism removes heat from the heat exchanger.
A circulation fan that operates the circulation fan when frosting occurs.
And an operation control means .

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction content]

Further, the invention according to claim 2 is in a storage box.
Equipped with a circulation fan that circulates the air inside the storage
In a refrigerator that indirectly cools the inside of the box,
A wall material defrosting mechanism that warms and defrosts the wall material of the storage box
When the wall material is being defrosted by the wall material defrosting mechanism,
Equipped with a circulation fan stop control means for stopping the circulation fan
It has the same configuration.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

[0012]

In the invention according to claim 1 configured as described above , the heat exchanger defrosting mechanism heats the heat exchanger during defrosting.
I'm sorry, but at this time frozen items are stored in the storage box
Itara circulation fan operation control means
Circulate the air. The air in the refrigerator is sprayed on the frozen food
Then, the cooled air circulates in the refrigerator.
And suppress the temperature rise. In other words,
Dissipate the heat positively and store it while defrosting the heat exchanger.
Do not let the temperature inside rise.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

In addition, according to claim 2 configured as described above.
In the invention, a refrigerating system for indirectly cooling a storage box
When the warehouse warms and defrosts the wall material with the wall material defrosting mechanism, it circulates
The fan stop control means stops the circulation fan. Sanawa
When warming the wall material, the wall material and the air in the refrigerator
By controlling the heat exchange of the
And does not interfere with the temperature rise of the wall material.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

As described above, the present invention provides a heat exchanger.
To dissipate the cold heat of frozen materials into the storage room during defrosting
As a result, it is possible to provide a refrigerator capable of suppressing an increase in the temperature inside the refrigerator as much as possible.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

According to the invention of claim 2, the wall
Make sure that cold air does not circulate inside the chamber when defrosting the material.
This prevents the temperature inside the refrigerator from rising and attaches it to the wall material.
Providing a refrigerator that can quickly remove the frost that has accumulated
You can

[Procedure Amendment 13]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

Two internal fans 30a, 30b (circulation fan
Each fan ) is configured by fixing the fan 32 to the rotation axis of the fan motor 31, and is attached to the left side wall 22 via a supporting member so as to face the partition wall 27. A cover 40 for forming an air flow path is attached to the front surfaces of the internal fans 30a and 30b. The cover 40 has an exhaust port 41 formed in a portion facing the fan 32 and a lower portion. A suction port 42 is formed in the. That is, the end of the upper side of the cover 40 is in contact with the upper wall 24, the end of the left side bent as an L-shaped cross section is in contact with the left side wall 22 of the storage box, and the end of the right side is the storage box 2.
0 of the rear wall 26, and the lower side thereof forms the suction port 42 with a predetermined gap from the left side wall 22.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

The left side wall 2 of the storage box 20 in the heat insulating box 10
The evaporator 51 of the cooling mechanism 50 is attached to the wall facing 2
The (heat exchanger) is fixed with its air flow path oriented in the vertical direction, and an air circulation hole 61 is formed in the upper part between the evaporator 51 and the left side wall 22 of the storage box 20. A shielding plate 60 having a blower fan 62 arranged in the air circulation hole 61 is fixed by its upper piece so as to hang from the upper wall of the inner box 12 in the heat insulating box 10. The shielding plate 60
A sufficient gap is formed between the lower side and the lower wall of the inner box 12 to form an air cooling flow passage that communicates with the upper air circulation hole 61 from the gap through the air flow passage of the evaporator 51. There is.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

The compressor 52 is the compressor motor 5
2a and a compression mechanism 52b that is driven by being connected to the rotation axis of the compressor motor 52a,
As shown in FIG. 5, the compressor motor 52a includes an electric control circuit 70 (circulation fan operation control means, circulation fan stop).
The drive is controlled by the control means) .

[Procedure Amendment 16]

[Document name to be amended] Statement

[Correction target item name] 0048

[Correction method] Change

[Correction content]

On the other hand, a make contact R6- interposed in the power supply path for the compressor motor 52a and the air-cooling fan 53.
Since 3 is conducting, the compressor motor 52a operates,
Furthermore, since the hot gas valve 57 is energized, the hot gas valve 57 is also turned on.
Opens and sends the high-temperature compressed refrigerant compressed by the compressor 52 to the evaporator 51. Then, the evaporator 5
Since No. 1 is heated, the frost attached to the evaporator 51 gradually dissolves. The temperature of the evaporator 51 is low and warm.
When the degree sensor Th3 is conducting, it is a heat exchanger.
This is when defrosting the evaporator 51.
Sometimes the movable contact of the cam timer TM touches the second contact and resets.
By energizing the exciting coil of Ray R6,
It is controlled to operate the valves 30a and 30b.

[Procedure Amendment 17]

[Document name to be amended] Statement

[Correction target item name] 0052

[Correction method] Change

[Correction content]

The blower fan 62 allows the air in the air flow circulation passage W to pass through the evaporator 51 and circulates in the air flow circulation passage W, but as described above, the evaporator 5 is used.
Since the temperature of No. 1 is rising, the air in the airflow circulation passage W becomes warm air and flows around the outer circumference of the storage box 20. And
At this time, the frost attached to the storage box 20 is melted. You
That is, when the evaporator 51 rises to a certain temperature
By operating the blower fan 62, the storage box 20
The defrosting of the wall material is performed while the internal fan 30a,
It is controlled to stop 30b.

[Procedure 18]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction content]

In this way, the blower fan 62 starts to operate, whereas the internal fans 30a and 30b stop operating, so that the circulation of air in the chamber RM2 is stopped. As described above, if warm air is blown to the outer circumference of the storage box 20, the temperature of the wall material rises. At this time, the internal fan 30a,
Since 30b is stopped, air is not circulated and heat exchange with the wall material having an increased temperature is suppressed. Therefore,
It is possible to prevent the temperature in the refrigerator from rising to an unsuitable temperature for food storage.

[Procedure Amendment 19]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

[Figure 5]

Claims (2)

[Claims] 1. A refrigerator main body in which a storage box made of a heat-conductive member is provided in the heat insulation box, and an air flow circulation passage is formed between an inner wall of the heat insulation box and an outer wall of the storage box, and the air flow. A heat exchange mechanism for cooling and heating a heat exchanger arranged in the circulation passage, an air blowing mechanism for circulating the air in the air flow circulation passage through the heat exchanger, and a temperature sensor for storing the heat. Temperature control means for controlling the cooling operation of the heat exchange mechanism so that the temperature in the box is within a predetermined range, an internal fan for circulating the internal air in the storage box of the refrigerator body, and a predetermined time A first defrost period for removing the frost from the heat exchanger by stopping the blower mechanism and operating the internal fan, and heating the heat exchanger of the heat exchange mechanism, and the first defrost After the period, activate the blower mechanism and Defrosting control means having a second defrosting period for defrosting the storage box by stopping the fan in the storage and heating the heat exchanger of the heat exchanging mechanism. refrigerator. 2. The refrigerator according to claim 1, wherein:
A defrosting box is formed by arranging a partition wall made of a heat conducting member that partitions the inside of the storage box into small chambers and installing the internal fan in the small chamber formed by the partition wall. And a refrigerator.