JP2835267B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator in which the temperature of a freezing room and the temperature of a storage room are controlled by independent systems of a freezing room refrigeration cycle and a freezing room refrigeration cycle.

[0002]

2. Description of the Related Art In a refrigerator having a freezer compartment and a refrigerator compartment (storage compartment), generally, only one system of a refrigerating cycle comprising a combination of a compressor, a condenser and an evaporator is provided, and the cool air of the evaporator is cooled. A fan for circulating in the refrigerator and a damper device for selectively supplying the circulating air to the refrigerator are provided.

It is known that a refrigeration cycle is operated at a high COP (coefficient of performance) and one of the conditions for improving the operation efficiency is to raise the evaporation temperature of the refrigerant as much as possible. On the other hand, in the refrigerator in which the evaporator in the refrigeration cycle is also used for cooling the freezing room and the refrigeration room as described above, it is necessary to set the evaporation temperature in accordance with the cooling temperature of the freezing room. Since it is practically impossible to set the refrigeration cycle higher, there is a problem that it is difficult to improve the operation efficiency of the refrigeration cycle and to realize power saving accompanying the refrigeration cycle.

Conventionally, in order to cope with such problems, the temperature of the freezer compartment and the refrigerating compartment are controlled by independent refrigerating compartment refrigerating cycles and refrigerating compartment refrigerating cycles. By raising the refrigerant evaporation temperature on the side of the room refrigeration cycle and improving its operation efficiency, it is possible to reduce the power consumption of the refrigerator as a whole, including the refrigeration cycle for the refrigerator and the refrigeration cycle for the freezer. Is being done.

[0005] Of the refrigerators provided with the two refrigerating cycles, in particular, the refrigerating compartments are arranged in the center and the refrigerating compartments are arranged above and below the refrigerating compartments. It is considered that the evaporator in the inside is arranged as shown in FIG.

That is, FIG. 5 is a schematic front view of the refrigerator main body 1 with the door removed, and the refrigerator main body 1 has a freezer compartment 2 disposed in the center and a freezer compartment thereof. A refrigerator room 3 and a vegetable room 4 as storage rooms are arranged above and below the room 2. A freezer compartment duct (not shown) defined through a partition cover 2a is provided at the back of the freezer compartment 2, and a freezer evaporator 5 included in the freezer compartment refrigeration cycle is provided in the duct. Be placed. A refrigerator compartment duct (not shown) defined by a heat insulating cover 3a is provided at the back of the refrigerator compartment 3, and a refrigerator compartment evaporator 6 of the refrigerator compartment refrigeration cycle is disposed in the duct. Is done.

In this case, each of the evaporators 5 and 6 is configured to have a size corresponding to each heat load. However, in order to reduce a dead space generated on the left and right sides, a large dimension in the lateral direction is set. On the other hand, the shape has a small dimension in the height direction.

A freezer compartment fan 7 is provided at the upper center of the freezer compartment duct. When the fan 7 is operated, the cool air of the freezer compartment evaporator 5 is cooled.
The air is supplied into the freezing room 2 through the air outlet 2b. At the upper center of the refrigerator compartment duct, a refrigerator compartment fan 8 is provided. When the fan 8 is operated, the cool air of the refrigerator compartment evaporator 6 blows out the air from the air outlet 3b.
Is supplied to the refrigerator compartment 3 via the
From the vegetable compartment 4 via an air duct (not shown). The cool air supplied to the freezer compartment 2 or the refrigerator compartments 3 and 4 as described above is supplied to the freezer compartment duct or the freezer compartment duct via air ducts (not shown) formed on the partition walls 9 and 10 between the compartments. It is designed to be returned to the refrigerator compartment duct.

[0009]

It is certain that the refrigerator configured as described above can promote power saving as compared with a refrigerator provided with only one refrigeration cycle, but the evaporators 5 and 6 have high efficiency. Air flow flowing up and down in the freezer compartment duct and the refrigerator compartment duct due to the operation of the fans 7 and 8,
The time for heat exchange with each of the evaporators 5 and 6 is shortened, and the amount of air flowing through each of the evaporators 5 and 6 is reduced.
Will be greatly different between the central part and the peripheral part. For this reason, it is inevitable that the heat exchange efficiency is reduced, and it is difficult to say that the power saving effect is sufficiently obtained.

Although the left and right dead spaces of the evaporators 5 and 6 are reduced, the upper and lower dead spaces of the evaporators 5 and 6 are inevitably increased.
There is also a problem that the volume efficiency of the refrigerator body is reduced. In addition, the heat insulation wall of the refrigerator compartment 3 can be originally thinner than the heat insulation wall of the freezer compartment 2.
Since the refrigerator evaporator 6 is disposed at the back of the refrigerator, it is necessary to increase the thickness dimension of the heat insulating wall corresponding to the evaporator 6, and if the internal volume of the refrigerator compartment 3 is correspondingly small, Inevitably, the volume efficiency of the refrigerator body is reduced from this aspect.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a sufficient power saving effect by providing two refrigeration cycles and to improve the volumetric efficiency of a refrigerator body. It is to provide a refrigerator that becomes like this.

[0012]

According to the present invention, in order to achieve the above object, a freezing room is arranged at a central portion, and storage rooms having a higher set temperature than the freezing room are arranged above and below the freezing room. A refrigerator comprising a refrigerator body, wherein the temperature control of the freezing room and each storage room is performed by a freezing room refrigeration cycle and a storage room refrigeration cycle of independent systems, respectively. The storage evaporator and the storage room evaporator of the storage room refrigeration cycle are disposed adjacent to the left and right in the deep part of the storage room, and circulate vertically while being in contact with the storage room evaporator and the storage room evaporator. A freezing room fan and storage for supplying cold air from each evaporator to the freezing room and the upper storage room by generating an air flow. After the room fan is arranged corresponding to each of the evaporators, the room fan is arranged between the freezing room evaporator and the storage room evaporator, and the inside is configured as an air duct for guiding the cool air in the upper storage room to the lower storage room. The heat insulating partition member is provided (claim 1).

In this case, the defrosting of the freezer evaporator can be performed by the forced defrosting method using the heating means, and the defrosting of the storage room evaporator can be performed by the off-cycle natural defrosting method ( Claim 2).

[0014] Further, the dew-proof pipe for the freezer compartment is constituted by using a heat-dissipating pipe in the freezing cycle for the freezer compartment, and the dew-proof pipe for the storage compartment is used for the heat dissipation in the refrigerating cycle for the storage compartment. It can also be configured using a pipe (claim 3).

Further, an evaporating dish for receiving defrost water from the evaporator for the freezer compartment and the evaporator for the storage compartment is provided, and a heat source for evaporating the defrost water in the evaporator dish is used as a heat source in the refrigerating cycle for the storage compartment. A configuration using piping may be used (claim 4).

[0016]

In the refrigerator according to the first aspect of the present invention, the temperature control of the freezing room and the storage rooms provided above and below the freezing room is performed by a freezing cycle for the freezing room and a freezing cycle for the freezing room of independent systems. Therefore, in particular, the refrigerant evaporation temperature in the storage room refrigeration cycle can be increased, and the COP of the refrigeration cycle can be increased. in this case,
Although the COP of the refrigeration cycle for the freezer compartment cannot be increased, the operation efficiency of the entire refrigerator including the refrigeration cycle for the storage compartment and the refrigeration cycle for the freezer compartment can be improved as a whole, and power saving can be achieved. Become.

Further, since the evaporators of the freezing cycle for the freezer compartment and the refrigerating cycle for the storage compartment are arranged adjacent to the left and right of the deep portion of the freezing compartment,
Even when the lateral dimension of each evaporator is set to be small, the dead space generated on the left and right of the evaporator naturally decreases, and accordingly, the dimension of each evaporator in the height direction can be set relatively large. In this case, since the airflow generated by the freezing room fan and the storage room fan corresponding to each evaporator is configured to flow up and down while being in contact with each evaporator,
The time required for heat exchange between the air flow and each evaporator becomes longer. In addition, as a result of the reduction in the lateral dimension of each evaporator, the amount of air flow in the evaporators is made uniform between the central portion and the peripheral portion.
Therefore, unlike the conventional configuration shown in FIG. 5, the heat exchange efficiency is not reduced, and the power saving effect can be sufficiently exhibited.

Further, as described above, both the evaporator for the freezer compartment and the evaporator for the storage compartment are arranged at the back of the freezer compartment, so that the thickness of the heat insulating wall of the storage compartment is increased as in the conventional configuration. As a result, it is possible to improve the volumetric efficiency of the refrigerator body. In addition, since the heat insulating partition member that partitions between the freezing room evaporator and the storage room evaporator also serves as an air duct for guiding the cool air in the upper storage room to the lower storage room, it can be seen from this aspect as well. The volumetric efficiency of the refrigerator body can be improved.

In the refrigerator according to the second aspect, the defrosting of the evaporator for the storage room is periodically performed by the off-cycle natural defrosting method. It is only necessary at the time of defrosting, and compared with the conventional configuration in which the relatively large evaporator for cooling the freezing room and the storage room needs to be forcibly defrosted, it is possible to reduce the number of times. Power saving can be promoted. In addition, since the off-cycle natural defrosting is performed every time the operation of the storage room evaporator is stopped, the amount of frost is relatively small. As a result, the radiation fin pitch of the storage room evaporator is set to be small. As a result, the volume efficiency can be improved, and the size can be reduced.

In the refrigerator according to the third aspect of the present invention, a dew-proof pipe using a heat-dissipating pipe that generates heat during operation of the freezer-room refrigeration cycle is provided as the dew-proof pipe for the freezer. Because it is possible to reliably obtain the dew-proof function of the pipe, and because the dew-proof pipe using the heat-dissipating pipe that generates heat during the operation of the refrigeration cycle for the storage room is provided as the dew-proof pipe for the storage room. Also, the dew prevention function of the dew prevention pipe can be reliably obtained.

In the refrigerator according to the present invention, the defrosting water in the evaporating dish (defrosting water from the evaporator for the freezer compartment and the evaporator for the storage compartment) is heated by the heat from the radiation pipe in the refrigerating cycle for the storage compartment. Which evaporates, but in general,
Since the operation time of the refrigeration cycle for the storage room is longer than the operation time of the refrigeration cycle for the freezer room, sufficient heat is given to the evaporating dish, and the defrost water inside the evaporating dish is surely ensured. It can be evaporated.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. FIG. 1 shows a schematic configuration of the refrigerator in a state where the main part is seen through. In FIG. 1, a refrigerator main body 11 has a freezer compartment 12 (actually, for example, divided into two upper and lower compartments, but is omitted here) arranged at the center, and the freezer compartment 11 is provided. A refrigerator compartment 13 and a vegetable compartment 14 are arranged above and below the refrigerator compartment 12 as storage rooms at a higher set temperature than the freezing compartment 12. A partition cover 15 is provided at the back of the freezer compartment 12.
a, and a refrigerator compartment duct 16 defined through a heat insulating cover 16a are provided adjacent to each other on the left and right sides.
The six spaces are partitioned by a heat insulating partition member 17.

A vertically extending air duct 17a is formed inside the heat insulating partition member 17, and this air duct 17a is arranged so as to guide cold air in the refrigerator compartment 13 into the vegetable compartment 14 as described later. ing.

In the freezer compartment duct 15, a freezer compartment evaporator (hereinafter abbreviated as F-eva) 18 of a freezer compartment refrigeration cycle, which will be described later, is disposed. A refrigerator evaporator (hereinafter abbreviated as R-evaporator) 19 as a storage-room evaporator of a storage-room refrigeration cycle, which will be described later, is provided.
It is provided adjacent to the back of the freezer compartment 2 on the left and right, and is separated from each other by a heat insulating partition member 17.

Fever 18 in freezer compartment duct 15
A fan 20 for a freezing room is arranged at a position above the air conditioner. When the fan 20 is operated, an air circulation path described below is formed. That is, the freezer compartment duct 15 → the outlet port 15 formed in the partition cover 15a.
b → Freezer compartment 12 → Suction port 12a formed at the bottom of freezer compartment 12 → Free air compartment air duct (not shown) formed in partition wall 21 between freezer compartment 12 and vegetable compartment 14 → Freezer compartment duct 15 A flowing air flow path is formed, and accordingly, an air flow that flows upward while contacting the F-eva 18 is generated.

The refrigerating room duct 16 has an upper part connected to an auxiliary duct 16b located at the back of the refrigerating room 13, and a refrigerating room fan 22 as a storage room fan is provided in the auxiliary duct 16b. Are located. When the refrigerating room fan 22 is operated, an air circulation path described below is formed. That is, the refrigerator compartment duct 16
→ Air outlet 16c formed in auxiliary duct 16b → Refrigerator 13 → Suction port 13a formed in the bottom of refrigerator 13 → Air duct (not shown) formed in partition wall 23 between freezer 12 and refrigerator 13 → The air duct 17a in the heat insulating partition member 17 → the vegetable compartment 14 → the suction port 14a formed in the ceiling of the vegetable compartment 14 → the vegetable compartment air duct (not shown) formed in the partition wall 21 → the refrigerator compartment duct 16 A flowing air flow path is formed, and accordingly, an air flow that flows upward while contacting the R-eva 19 is generated.

FIG. 2 schematically shows a piping configuration of a freezing room refrigeration cycle A including the fuel-evaporator 8. This figure 2
, The compressed vaporized refrigerant discharged from the refrigerating operation compressor 24 passes through the condenser 25 and the dew-proof pipe 26 constituting the heat-dissipating pipes, respectively.
7. After being liquefied through the capillary tube 28, it is supplied to the F-eva 18 where it is returned to the compressor 24 after heat exchange and evaporation. In this refrigerating room refrigeration cycle A, the frost on the F-eva 18 is melted by a forced defrosting method using a heating means (defrost heater or hot gas from the compressor 24) not shown. I have.

FIG. 3 schematically shows a piping configuration of a refrigeration cycle B for a storage room including the R-eva 19. In FIG. 3, the compressed vaporized refrigerant discharged from the refrigeration compressor 29 passes through an evaporating dish pipe 30, a condenser 31 and a dew-prevention pipe 32, each constituting a heat-dissipating pipe, and then passes through a dryer 33 and a capillary tube 34. After being liquefied, it is supplied to the R-eva 19, where it is heat-exchanged, evaporated and then returned to the compressor 29. The storage room refrigeration cycle B is configured to periodically melt the frost on the R-eva 19 by a so-called off-cycle natural defrosting method.

FIG. 4 shows each refrigeration cycle A as described above.
2 and B are substantially shown. That is, in the refrigerating room refrigerating cycle A, the condenser 25 is heat-conductively provided inside the steel plate portion constituting the left side surface (the right side surface in FIG. 4) of the refrigerator main body 11, and the condenser 25 is protected. A dew pipe 26 is heat-conductively provided inside the front surfaces of the partition walls 21 and 23 (and the front surface of the partition wall between the upper and lower freezer compartments, not shown).

In the refrigerating cycle B for the storage room, the evaporating dish pipe 30 is provided at the bottom of the refrigerator main body 11 so as to receive the defrosted water from the F-eva 18 and the R-eva 19. The condenser 31 is disposed so as to be in contact with the inside of the steel plate portion constituting the right side surface (the left side surface in FIG. 4) of the refrigerator main body 11 and the dew-proof pipe 32 is disposed in contact with the back surface of the refrigerator main body 11. In addition, it is provided on the inside of the front side peripheral portion of the refrigerator main body 11 (each front side peripheral portion of the refrigerator compartment 13 and the vegetable compartment 14) in heat conduction.

According to the configuration of the present embodiment, the following operations and effects can be obtained. Temperature control of the freezer compartment 12, the refrigerator compartment 13 and the vegetable compartment 1
Since the temperature control of 4 is performed by the freezing room refrigeration cycle A and the storage room refrigeration cycle B, which are independent systems, in particular, the refrigerant evaporation temperature in the storage room refrigeration cycle B can be increased. , The CO of the refrigeration cycle B
P can be increased. In this case, the COP of the refrigeration cycle A for the freezer compartment cannot be increased, but the overall operation efficiency of the refrigerator including the refrigeration cycle B for the storage compartment and the refrigeration cycle A for the freezer compartment can be improved as a whole, thereby saving power. Can be achieved.

[0032] The F-eva 18 and the R-eva 19 are
Are arranged adjacent to the left and right sides of the back of the vehicle, so that even when the lateral dimensions of the F-eva 18 and the R-eva 19 are set to be small, the dead space generated on the left and right thereof is naturally reduced. Accordingly, the height dimension of each of the evaluations 18 and 19 can be set relatively large. In this case, the airflow generated by the freezer compartment fan 20 and the refrigerator compartment fan 22 corresponding to each of the evaporators 18 and 19 flows upward while being in contact with the F and Eva 18, respectively. Therefore, the time for heat exchange between the air flow and each of the evaporators 18 and 19 becomes longer. Of course, like this, each eva 18 and 1
As a result, the amount of air flow in the evaporators 18 and 19 becomes uniform between the central portion and the peripheral portion, and therefore, as in the conventional configuration shown in FIG. The efficiency is not reduced, and the power saving effect can be sufficiently exhibited.

As described above, the F-eva 18 and the R-eva 19
Are arranged at the back of the freezer compartment 12, the thickness of the heat insulating wall of the refrigerator compartment 13 (and the vegetable compartment 14) does not need to be increased as in the conventional configuration. It is possible to realize an improvement in volumetric efficiency.
Further, the heat insulating partition member 17 for partitioning between the F-eva 18 and the R-eva 19 has a configuration in which an air duct 17a for guiding cool air in the refrigerator compartment 13 to the vegetable compartment 14 is provided inside. Therefore, the volumetric efficiency of the refrigerator body 11 can be improved.

Since the defrosting of the R-eva 19 is periodically performed by the off-cycle natural defrost method, the power for defrost is only required when the F-eva 18 is forcibly defrosted. Therefore, the size of the relatively large evaporator for cooling the freezer compartment and the refrigerating compartment can be reduced as compared with the conventional configuration in which forced defrosting needs to be performed, and power saving can be promoted from this aspect as well. In addition, in the R-eva 19, the amount of frost is relatively small because the off-cycle natural defrost is performed every time the operation is stopped. As a result, the radiation fin pitch of the R-eva 19 is reduced. Can be set small to improve the volumetric efficiency, and the size can be reduced.

During operation of the refrigeration cycle A for the freezer compartment, the dew prevention pipe 26 utilizing the heat radiating pipe in the refrigeration cycle A generates heat. Further, during operation of the storage room refrigeration cycle B, the dew prevention pipe 32 using the heat radiating pipe in the refrigeration cycle B generates heat. A dew-proof function can also be reliably obtained.

The evaporating dish 35 from the F-eva 18 and the R-eva 19
The defrost water flowing into the storage chamber is evaporated by heat from the evaporating dish pipe 30 formed by the heat radiating pipe in the storage room refrigeration cycle B. In general, the storage room refrigeration cycle B Is longer than the operation time of the freezing room refrigeration cycle A, sufficient heat is given to the evaporating dish 35, and the defrost water inside the evaporating dish 35 can be surely evaporated. .

[0037]

As is apparent from the above description, according to the refrigerator of the first aspect, the freezing room is arranged at the center and the storage rooms having a higher set temperature than the freezing room above and below the freezing room. In a refrigerator having a refrigerator body arranged and arranged, a freezing room evaporator of a freezing room refrigeration cycle of an independent system and a storage room evaporator of a freezing room refrigeration cycle are horizontally adjacent to the back of the freezing room. In addition to the above arrangement, a heat insulating partition member configured as an air duct for guiding the cool air in the upper storage chamber to the lower storage chamber is disposed between the evaporator for the freezer compartment and the evaporator for the storage compartment. ,
The power saving effect provided by providing two refrigeration cycles can be sufficiently exerted, and the volume efficiency of the refrigerator body can be improved.

According to the refrigerator of the second aspect, the electric power is required only for the defrosting of the evaporator for the freezer compartment, so that the electric power required for the defrosting is reduced.

According to the third aspect of the present invention, the defrosting pipe for the freezer compartment is constituted by using the heat radiating pipe in the refrigerating cycle for the freezing compartment, and the dewproofing pipe for the storage compartment is used for the freezing for the storage compartment. Since the configuration is made using the heat-dissipating pipes during the cycle, the dew-proof function of the dew-proof pipes can be reliably exhibited.

According to the refrigerator of the present invention, the heat-dissipating pipe in the refrigerating cycle for the storage room is used as a heat source of the evaporator for receiving the defrost water from the evaporator for the freezing room and the evaporator for the storage room. Therefore, sufficient heat is given to the evaporating dish, and the defrost water in the evaporating dish is surely evaporated.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a refrigerator in a see-through state, showing an embodiment of the present invention.

FIG. 2 is a piping diagram of a refrigeration cycle, part 1

FIG. 3 is a piping diagram of a refrigeration cycle, part 2

FIG. 4 is a perspective view schematically showing piping of a refrigeration cycle.

FIG. 5 is a front view of a refrigerator main body showing a conventional example.

[Explanation of symbols]

In the drawings, 11 is a refrigerator main body, 12 is a freezer compartment, 13 is a refrigerator compartment (storage compartment), 14 is a vegetable compartment (storage compartment), 15 is a freezer compartment duct, 15a is a partition cover, 16 is a refrigerator compartment duct, 16a is a heat insulating cover, 17 is a heat insulating partition member, 17a
Is an air duct, 18 is an evaporator for a freezer compartment, 19 is an evaporator for a refrigerator compartment, 20 is a fan for a refrigerator compartment, 22 is a fan for a refrigerator compartment (fan for a storage compartment), 24 is a compressor for refrigeration operation, and 26 is a dew-proof pipe ( 29 is a refrigerator for refrigeration operation, 30 is an evaporating dish pipe (radiating pipe), 32 is an anti-dew pipe (radiating pipe), 35 is an evaporating dish, A is a freezing room refrigeration cycle, and B is a storage. 1 shows a room refrigeration cycle.

──────────────────────────────────────────────────の Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F25D 17/08 F25D 19/04 F25D 21/04 F25D 21/06 F25D 21/14

Claims (4)

(57) [Claims] 1. A refrigerator having a freezer compartment in the center and a storage compartment having a higher set temperature than the freezer compartment above and below the freezer compartment, and controlling the temperature of the freezer compartment and each of the storage compartments. , Which are performed by a refrigeration cycle for a freezer compartment and a refrigeration cycle for a storage compartment, respectively, wherein the evaporator for the freezer compartment included in the refrigeration cycle for the freezer compartment and the evaporator for the storage compartment included in the refrigeration cycle for the storage compartment are provided. Are arranged adjacent to the left and right of the freezer compartment at the left and right sides, and the air from the respective evaporators is cooled by generating an airflow flowing vertically while contacting the evaporator for the freezer compartment and the evaporator for the storage compartment. And a fan for the freezer compartment and a fan for the storage compartment for supplying to the upper storage compartment, respectively, corresponding to the above evaporators. A heat insulating partition member disposed between the freezing room evaporator and the storage room evaporator and configured as an air duct for guiding the cool air in the upper storage room to the lower storage room. Refrigerator. 2. The defrosting of the freezer evaporator is performed by a forced defrosting method using a heating means, and the defrosting of the storage room evaporator is performed by an off-cycle natural defrosting method. The refrigerator according to 1. 3. A defrosting pipe for a freezing room is constructed by using a heat-dissipating pipe in a freezing cycle for a freezing room, and a dew-proofing pipe for a storage room is used for heat dissipation in a refrigerating cycle for a storage room. The refrigerator according to claim 1, wherein the refrigerator is configured using a pipe. 4. An evaporator for receiving defrost water from the evaporator for the freezer compartment and the evaporator for the storage compartment, wherein a heat source for evaporating the defrost water in the evaporator dish is a heat source in the refrigerating cycle for the storage compartment. The refrigerator according to claim 1, wherein the refrigerator is configured to use piping.