JP3049425B2 - Refrigerator with two evaporators - 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, and more particularly, to a refrigerator provided with an evaporator for a freezer compartment and an evaporator for a refrigerator compartment separately.

[0002]

2. Description of the Related Art Generally, refrigerators are used for freezing or refrigerated storage of foods and drinks. As shown in FIG. 1, the refrigerator has a receiving space separated into a freezer compartment 10 a and a refrigerator compartment 10 b in a case 10, and the freezer compartment 10 a and the refrigerator compartment 10 b are provided on one side of the case 10. The door 12 is opened and closed. A device for forming a refrigerating cycle and lowering the temperatures of the freezing room 10a and the refrigerating room 10b includes a compressor 20, a condenser 30, a capillary tube 40 (see FIG. 2), an evaporator, and the like.

In a large-capacity refrigerator or the like, the evaporator is separately provided as an evaporator 50 for a freezer compartment and an evaporator 52 for a refrigerator compartment. Each of the evaporators 50 and 52 includes a freezer compartment 10a,
It is provided outside the refrigerator compartment 10b and is of a pin tube type for high heat exchange efficiency. The air in the freezing and refrigerating compartments 10a and 10b is supplied to the evaporators 50 and 52, respectively.
Are also separately provided, and a constant-speed induction motor is used as the motor 70 for driving each of the blowers 60, 62. Each of the evaporators 50 and 52 has a function of removing frost formed by condensing moisture in the air due to a temperature difference.
A defrosting device (not shown) such as a defrosting heater is provided.

[0003] The operation of a general refrigerator is shown in FIG.
This will be described with reference to FIG. First, the compressor 20 compresses a low-temperature and low-pressure gaseous refrigerant to a high-temperature and high-pressure. The compressed high-temperature and high-pressure gaseous refrigerant is cooled and condensed while passing through the condenser 30 to become a high-pressure liquid state. And the capillary tube 40
The temperature and the pressure of the high-pressure liquid state refrigerant while passing through are lowered. Next, in each of the evaporators 50 and 52, the surrounding heat is removed while changing to a low-temperature low-pressure gas state.
The surrounding air of each evaporator 50, 52 is cooled. At this time, the air cooled by the evaporators 50 and 52 is supplied to the freezing room 10 by the operation of the blowing fans 60 and 62.
a, It flows into the refrigerator compartment 10b. That is, the freezing room 10a and the refrigerating room 10b are
Is cooled by the evaporators 50 and 52 in the air circulation process. The frost formed on the evaporators 50 and 52 is melted by the operation of the defroster and discharged to the outside via a drain passage (not shown).

The linking system of the evaporators 50 and 52 is classified into a parallel system and a series system. The serial type is a mode in which a refrigerant pipe for supplying a refrigerant passes through one of the two evaporators first, and then is connected to another evaporator. The parallel type is a type in which a refrigerant pipe for supplying a refrigerant to each evaporator is branched from a main refrigerant pipe.

FIG. 2 is a diagram showing a parallel type, in which each evaporator 5
The amount of refrigerant flowing into the refrigerant pipes 0, 52 is the freezing room 10a.
And at the branch point of each refrigerant pipe, it is adjusted by an adjusting device such as a three-way valve 80 based on the temperature of the refrigerator compartment 10b. That is, when the temperature of the refrigerator compartment 10b falls below the set temperature and the temperature of the freezer compartment 10a rises above the preset temperature, the three-way valve 80 shuts off the refrigerant pipe of the refrigerator evaporator 52 and the freezer compartment. The refrigerant flow is guided to the refrigerant pipe of the evaporator 50 for use. Thereby, the cooling action of the freezing room evaporator 50 becomes more active, and the temperature of the freezing room 10a is reduced intensively. Conversely, when the temperature of the refrigerator compartment 10b becomes higher than the set temperature, the temperature of the refrigerator compartment 10b is reduced intensively by causing the refrigerant to flow toward the refrigerator compartment 10b. Of course, when the temperatures of the freezing compartment 10a and the refrigerating compartment 10b simultaneously fall below the set temperature, the operation of the compressor 20 stops, and the refrigerant flow stops. After all, in the case where the freezing room 10a and the refrigerating room 10b are simultaneously cooled using one evaporator, the thermodynamic loss generated due to the difference in the temperature band between the freezing room 10a and the refrigerating room 10b is reduced. Will be able to At this time, the freezing room 10a, the refrigeration room 10
Since each of the blower fans 60 and 62 for circulating the air of b is driven by the constant speed induction motor 70, the freezing compartments 10a and
The temperature of the refrigerating compartment 10b is adjusted by adjusting the amount of refrigerant flowing into each of the evaporators 50 and 52 and operating the compressor 20.

On the other hand, the freezer compartment evaporator 50 is
Since the device provided outside of 0a cannot be provided with a defrosting device that performs a heat-generating action such as a defrosting heater due to the characteristics of the freezing room 10a to be maintained at a low temperature of 0 ° C. or lower,
Moisture in the air condensed by the heat exchange action becomes frost and accumulates. Therefore, the heat exchange efficiency gradually decreases.

[0007] When the refrigerator evaporator 52 is provided outside the refrigerator compartment 10b, it is difficult to provide a defrosting device in the refrigerator compartment 10b like the freezer compartment evaporator 50. In addition, even if a defrosting device is provided, a pin tube type evaporator 52
Due to the structure of the above, the moisture generated by the frost being melted by the defrosting action is not sufficiently discharged and is accumulated. For this reason, there is a possibility that the storage state of the food stored in the refrigerator compartment 10b may be deteriorated due to the decay of moisture. In addition, each evaporator 5
When 0 and 52 are provided inside the freezer compartment 10a and the refrigerator compartment 10b, the respective blowing fans 60 and 62 must also be provided inside the freezer compartment 10a and the refrigerator compartment 10b. For this reason, the actual use capacity of the freezing and refrigerating compartments 10a and 10b is reduced due to the installation of the blowers 60 and 62.

According to such a conventional technique, each evaporator 5
The amount of refrigerant flowing into the refrigerant pipes 0 and 52 is
a. Since the temperature must be adjusted based on the temperature of the refrigerator compartment 10b, a separate mechanism such as the three-way valve 80 is required. Therefore, the manufacturing cost of the refrigerator increases, and the noise generated when the three-way valve 80 is operated lowers the commercial value of the refrigerator. Further, unlike the freezing room 10a, the food is not stored in a frozen state in the refrigerator room 10b. For this reason, air is condensed in the process of passing through the evaporator 52, and is supplied to the refrigerator compartment 10b via the blower fan 62 in a moisture-free state while being melted by the evaporator 52 during operation of the defroster. Since the frost is discharged to the outside through a separate drain passage, there is a disadvantage that the humidity is reduced and the stored food is easily dried.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art. It is an object of the present invention to provide an evaporator for a refrigerator in a refrigerator, and To automatically control the temperature of the freezer compartment and the refrigerator compartment without using a separate device such as a valve, to perform a moisturizing action in the refrigerator compartment and to prevent various problems caused by the use of the three-way valve. To provide a refrigerator having two evaporators.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a case which forms a receiving space separated into a freezer compartment and a refrigerator compartment, a freezer compartment mounted on one side of the case, Each of the doors for opening and closing the refrigerator compartment, equipment for forming an evaporator, a compressor, a condenser, and a capillary refrigeration cycle, and a blower fan for circulating air through the evaporator are configured to include the evaporator and the blower In a refrigerator in which fans are separately provided for a freezer compartment and a refrigerator compartment, the evaporator for a freezer compartment is provided .
And a refrigerator compartment evaporator are connected in parallel, and
Refrigerant pipe for supplying refrigerant to evaporator and refrigerant to refrigerator evaporator
The refrigerant pipe supplying the main refrigerant pipe from the main refrigerant pipe without passing through another adjusting device
The simple branching and the provision of the refrigerator compartment evaporator and the refrigerator compartment blower fan connected to the refrigerator compartment in the refrigerator compartment enable a dehumidifying function to perform a moisturizing function due to evaporation of water. It is characterized by having such a configuration. Further, since the refrigerating room evaporator is in the form of a direct cooling plate,
It is characterized in that moisture is smoothly discharged during the defrosting operation and the space occupied in the refrigerator compartment is not large. Furthermore,
The blower fan is configured to be adjustable in rotation speed by being linked with a variable speed motor.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail with reference to FIG. In the structure of the present invention, the same parts as those of the conventional structure are not described, and are denoted by the same reference numerals. FIG. 3 is a cross-sectional view illustrating a structure of a refrigerator having two evaporators according to an embodiment of the present invention, and FIG. 4 is a view illustrating components forming a refrigeration cycle in a refrigerator having two evaporators according to an embodiment of the present invention. FIG. 5 is a schematic diagram illustrating the operation of a refrigerator having two evaporators according to an embodiment of the present invention. 2 according to an embodiment of the present invention
As shown in FIG. 3, the refrigerator having two evaporators includes a freezer evaporator 50 for cooling the freezer 10a and a refrigerator compartment 1.
0b for cooling the refrigerator. The refrigerating room evaporator 53 is a panel type which is smaller than a conventional pin tube type, and is connected in parallel with the freezing room evaporator 50. As described above, the panel type is preferably used for the refrigerator compartment evaporator 53 in the present invention, but a conventional pin tube type may be used.

The refrigerating compartment evaporator 53 has a substantially "" shape, and is mounted on the upper edge inside the refrigerating compartment 10b. A blower fan 62 for guiding the air in the refrigerator compartment 10b is mounted on one side thereof, and the air guided by the blower fan 62 comes into contact with the refrigerator compartment evaporator 53 and then flows into the refrigerator compartment 10b again. A guide cover 90 that forms a circulation ventilation path is provided in a form that covers the refrigerator compartment evaporator 53.

At the center of the guide cover 90, an air inlet 90a is formed near the blower fan 62 and allows air in the refrigerator compartment 10b to be sucked into the cooler room 10b when the blower fan 62 operates. An exhaust port 90b is formed at both ends to allow the sucked air to be discharged again to the refrigerator compartment 10b via the refrigerator evaporator 53.

Then, as shown in FIG.
Refrigerant pipes, which are channels for supplying the refrigerant to 0 and 53, are simply branched from the main refrigerant pipe without passing through a separate adjusting device such as a conventional three-way valve 80 (see FIG. 2). Each blower fan 60,
A variable speed type whose rotation speed can be adjusted is used as the motor 72 for driving the motor 62.

According to the control logic for adjusting the temperature of the freezing room 10a as shown in FIG. 5, the temperature of the freezing room 10a (T
₁ ) is higher than the set temperature (T _set1 ), the compressor 20 and the freezing room blower fan 60 operate, and the freezer room temperature (T ₁ ) is activated by the operation of the compressor 20 and the freezing fan 60. _Falls below the set temperature (T _set1 ), the operation of the compressor 20 and the blower fan 60 stops. The temperature (T) of the refrigerator compartment as shown in FIG.
According to the control logic for adjusting ₂ ), when the temperature (T ₂ ) of the refrigerator compartment is higher than the set temperature (T _set2 ), the refrigerating compartment blower fan 62 operates, and When the temperature (T ₂ ) of the refrigerator compartment falls below the set temperature (T _set2 ) by the operation, the operation of the blower fan 62 stops.

The number of rotations of the freezing room fan 60 during operation is calculated by "the number of rotations of the freezing room fan = proportional coefficient × (freezer room temperature-set temperature) + minimum number of rotations". The number of rotations of the blower fan 62 at the time of operation is calculated by “the number of rotations of the refrigeration room blower fan = proportional coefficient × (refrigerator room temperature−set temperature) + minimum number of rotations”. Here, the proportionality coefficient is determined by the size of each blower fan 60, 62, the freezing room 10a.
And the bulk of the refrigerator compartment 10b, the capacity of the motor 72, and the like.

The operation of a refrigerator having two evaporators according to an embodiment of the present invention configured as described above will be described with reference to FIGS.
This will be described below with reference to FIG. In the refrigerator compartment 10b, the air inside the refrigerator compartment 10b is guided through the air inlet 90a of the guide cover 90 by the operation of the refrigerator compartment blower fan 62, cooled through the refrigerator compartment evaporator 53, and then exhausted from the guide cover again. It is cooled by a circulation process discharged through the port 90b. On the other hand, when the temperature of the refrigerator compartment 10b falls below the set value, the supply of the refrigerant to the refrigerator compartment evaporator 53 is interrupted by a separate adjusting device such as a three-way valve 80 (see FIG. 2) as in the related art. Instead, while the supply of the refrigerant is maintained as it is, the rotation speed of the blower fan 62 is reduced by operating the variable speed motor 72 to adjust the air circulation speed, or the operation of the blower fan 62 is stopped. It stops and the temperature starts to rise again. Also when the temperature of the freezing room 10a falls below the set value, the operation of the compressor 20 stops,
Therefore, the inflow of the refrigerant is interrupted, and the temperature rise is accelerated.

On the other hand, the refrigerator compartment 10b is maintained at a temperature of about 4 ° C. to 5 ° C. Therefore, when the operation of the compressor 20 is stopped, the temperature of the refrigerator evaporator 53 installed in the refrigerator compartment 10b becomes equal to or higher than zero degree, so that the frost melts naturally to perform the defrosting action. Become. At this time, since the refrigerating room evaporator 53 is a direct cooling plate type, during the defrosting operation, the water generated in the process of melting the frost does not accumulate but flows smoothly and flows through a drain passage (not shown). While being discharged to the outside of 10b, a part thereof is evaporated in the refrigeration room 10b to perform a moisturizing action.

[0019]

As described above, the refrigerator having two evaporators according to the present invention has the following effects. Since no separate control device such as a three-way valve for distributing the refrigerant supplied to the freezer evaporator or the refrigerator compartment evaporator is used, the operating noise generated when using the three-way valve is eliminated, and the overall manufacturing cost is reduced. There is an advantage that the freshness of the food is maintained for a long time by the moisturizing action by the refrigerator evaporator provided in the refrigerator compartment.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing the structure of a conventional refrigerator having two evaporators.

FIG. 2 shows a conventional refrigerator equipped with two evaporators.
The schematic block diagram which shows the element which comprises a refrigeration cycle.

FIG. 3 is a cross-sectional view illustrating a structure of a refrigerator having two evaporators according to an embodiment of the present invention.

FIG. 4 is a schematic configuration diagram showing components forming a refrigeration cycle in a refrigerator having two evaporators according to an embodiment of the present invention.

FIG. 5 is an operation flowchart illustrating a control logic for controlling the temperature of a freezer compartment and a refrigerator compartment in a refrigerator having two evaporators according to an embodiment of the present invention.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F25D 11/02 F25B 1/00 383 F25B 5/02 510 F25B 5/02 530

Claims (3)

(57) [Claims] 1. A case forming a receiving space separated into a freezer compartment and a refrigerator compartment, doors mounted on one side of the case for opening and closing the freezer compartment and the refrigerator compartment, an evaporator, a compressor, A condenser and a device that forms a refrigeration cycle such as a capillary tube;
Is configured to include a blowing fan for circulating air through the evaporator, the evaporator and the blowing fan is a freezer compartment, in the refrigerator that comes separately for the refrigerating chamber, the freezing chamber evaporator and the refrigerating compartment Connected in parallel with the evaporator
And a refrigerant pipe for supplying a refrigerant to the freezer evaporator.
The refrigerant pipe that supplies the refrigerant to the storage chamber evaporator is controlled from the main refrigerant pipe.
The simple branching without the use of a knot device and the provision of the refrigerator compartment evaporator and the refrigerator compartment blower fan associated therewith in the refrigerator compartment contribute to the evaporation of water during the defrosting operation. the Ruhoshime action is configured to be a refrigerator according to claim. 2. The refrigerating room evaporator is configured as a direct cooling plate, and moisture is smoothly discharged during a defrosting operation.
2. The refrigerator according to claim 1, wherein a space occupied in the refrigerator compartment is increased. 3. The refrigerator according to claim 1, wherein the blower fan is configured to be adjustable in rotation speed by being linked with a variable speed motor.