JP2001133112A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator having a plurality of evaporators in which high storage quality of food is ensured through freezing cycle exhibiting high cooling efficiency. SOLUTION: A compressor 51, a condenser 52, a capillary tube 53, a first evaporator 48 in a refrigeration compartment 46, and a second evaporator 49 in a freezing compartment 47 are coupled in series to constitute a refrigeration cycle. A refrigerant flow rate varying unit 50 is disposed between the first evaporator 48 and the second evaporator 49 and the difference between the room temperature and the evaporation temperature is reduced by controlling the evaporation temperature of the first evaporator 48 and the second evaporator 49 variably. According to the arrangement, efficiency of the refrigeration cycle is enhanced and storage performance of foods is enhanced by suppressing room temperature variation or dehumidifying function.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a plurality of cooling chambers and a plurality of evaporators.

[0002]

2. Description of the Related Art In recent years, refrigerators have been proposed in which an evaporator is provided in each of a plurality of refrigerators to cool the refrigerator.

A conventional refrigerator of this kind is disclosed in
JP-A-210753 discloses an example.

Hereinafter, the conventional refrigerator will be described with reference to the drawings.

FIG. 4 is a side sectional view showing a schematic structure of a refrigerator showing a conventional example. FIG. 5 is a refrigeration cycle diagram showing a conventional example. FIG. 6 is a block diagram of an operation control circuit showing a conventional example.

In FIG. 4, reference numeral 1 denotes a refrigerator main body, which is a freezer compartment 2 partitioned so as not to mix cold air with each other.
And the refrigerator compartment 3. A first evaporator 4 is installed in the freezer compartment 2, and a second evaporator 5 is installed in the refrigerator compartment 3. Reference numeral 6 denotes a first blower provided adjacent to the first evaporator 4, and reference numeral 7 denotes a second blower provided adjacent to the second evaporator 5. Reference numeral 8 denotes a compressor provided at a lower rear portion of the refrigerator body 1.

In FIG. 5, reference numeral 9 denotes a condenser, 10 denotes a capillary tube as a decompressor, 11 denotes a refrigerant tube connecting the first evaporator 4 and the second evaporator 5, and a compressor 8; The condenser 9, the capillary tube 10, the first evaporator 4, the refrigerant pipe 11, and the second evaporator 5 are sequentially connected to form a closed circuit.

Next, in FIG. 6, a control means 12, which is a control section, has, as input terminals, a freezer compartment temperature controller 13 for setting the temperature of the freezer compartment 2 and a refrigerator compartment temperature control for setting the temperature of the refrigerating compartment 3. A refrigerator 14, a freezer compartment temperature detecting means 15 for detecting the temperature of the freezing compartment 2, and a refrigerator compartment temperature detecting means 16 for detecting the temperature of the refrigerating compartment 3 are connected. The second relay 18 is connected.

A first switch 20 that is turned on / off in accordance with the operation of the first relay 17 is connected to one of the terminals of the power supply 19, and the output terminal of the first switch 20 is connected to the compressor 8. And the second switch 21 are connected.
The contact point a of the second switch 21 is connected to the first blower 6 described above, and the contact b is connected to the second blower 7 described above.

[0010] Regarding the refrigerator configured as described above,
The operation will be described below.

The refrigerant compressed by the compressor 8 and radiated and liquefied by the condenser 9 is decompressed by the capillary tube 10, partially evaporated in the first evaporator 4, and passed through the second evaporator 5. While the remainder evaporates, each performs a heat exchange action. Thereafter, the gaseous refrigerant is sucked into the compressor 8. Such a refrigeration cycle is repeated as the compressor 8 is driven.

A first blower 6 and a second blower 7
, The air in the freezing compartment 2 and the refrigerating compartment 3 undergo heat exchange in the first evaporator 4 and the second evaporator 5.

Here, if the temperature of the freezing room temperature detecting means 15 is higher than the set temperature based on the setting of the freezing room temperature controller 13, the first relay 17 is operated by the control means 12 and the first relay 17 is operated. The switch 20 is turned on, and the compressor 8 is operated. Further, when the temperature of the refrigerator compartment temperature detecting means 16 is higher than the set temperature based on the setting of the refrigerator compartment temperature controller 14, the second relay 18 is operated by the control means 12 and the contact of the second switch 21 is turned on. b, and the second blower 7 is operated. By this action, the refrigerator compartment 3 is selectively cooled and controlled to a predetermined temperature.

On the other hand, the temperature of the freezer compartment temperature detecting means 15 is higher than the set temperature based on the setting of the freezer compartment temperature controller 13, and the temperature of the refrigerator compartment is detected from the set temperature based on the setting of the refrigerator compartment temperature controller 14. When the temperature of the means 16 is low, the second relay 18 is operated by the control means 12 to be connected to the contact a of the second switch 21 and the first blower 6
Is driven. By this operation, the freezing compartment 2 is selectively cooled and controlled to a predetermined temperature.

When the temperature of the freezing room temperature detecting means 15 is lower than the set temperature based on the setting of the freezing room temperature controller 13, the first relay 17 is operated by the control means 12 and the first switch is operated. 20 turns off, and the operation of the compressor 8 is stopped.

[0016]

However, in the above-mentioned conventional structure, the first evaporator 4 and the second evaporator 5 are connected by the refrigerant pipe 11 having no decompression function. The temperatures are almost the same, and the freezer compartment 2 and the refrigerator compartment 3
Is controlled by the operation control of the first blower 6 and the second blower 7, so that the cooling efficiency is increased by cooling with the low-temperature cold air more than necessary especially in the refrigerator compartment 3 having a large temperature difference from the evaporation temperature. This leads to the disadvantage that power is wasted and wasteful electric power is consumed, and at the same time, indoor temperature fluctuations and humidity decrease are caused, temperature stress is applied to the food, and drying is accelerated, thereby deteriorating the quality of the food.

The present invention solves the conventional problems, and provides a refrigerator having high cooling efficiency and high food storage quality by bringing the evaporation temperature of each evaporator closer to the set temperature of each cooling chamber. Aim.

[0018]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention is directed to an apparatus having a plurality of cooling chambers for cooling and storing food, comprising a compressor, a condenser, and a plurality of evaporators connected in series. A variable refrigerant flow rate device was provided, and a plurality of evaporators were installed in a cooling chamber having a higher set temperature in order from the upstream side of the refrigeration cycle.

Thus, the evaporation temperature of each evaporator can be arbitrarily changed and controlled to increase the efficiency by cooling close to the set temperature of each cooling chamber and suppress drying.

In the apparatus provided with a cooling chamber for cooling and storing food, a compressor, a condenser, a plurality of evaporators connected in series, a capillary tube provided between the condenser and the evaporator, and a plurality of evaporators are provided. A variable refrigerant flow device was provided between the units, and a plurality of evaporators were installed in a cooling chamber having a higher set temperature in order from the upstream side of the refrigeration cycle.

This makes it possible to more reliably change and control the evaporation temperature of each evaporator, to further increase the efficiency by cooling closer to the set temperature of each cooling chamber, and to suppress drying.

[0022]

DETAILED DESCRIPTION OF THE INVENTION The invention according to claim 1 of the present invention comprises a plurality of cooling chambers for cooling and storing food, comprising a compressor, a condenser, and a plurality of evaporators connected in series. Constitute a refrigeration cycle provided with a refrigerant flow variable device,
The plurality of evaporators are installed in a cooling chamber having a higher set temperature in order from the upstream side of the refrigerating cycle, and the evaporating temperatures of the plurality of evaporators can be changed and controlled, so that the efficiency of the refrigerating cycle increases, and The difference between the storage temperature and the cold air temperature is reduced, and temperature fluctuation and drying are suppressed.

According to a second aspect of the present invention, there is provided an apparatus having a plurality of cooling chambers for cooling and storing food, wherein a compressor, a condenser, a plurality of evaporators connected in series, the condenser and the evaporator are provided. A refrigeration cycle comprising a capillary tube provided between the vessels and a variable refrigerant flow device provided between the plurality of evaporators, and the plurality of evaporators are sequentially set at a set temperature from the upstream side of the refrigeration cycle. Installed in a high cooling room, the evaporation temperature of multiple evaporators can be more reliably changed,
It can be controlled, the efficiency of the refrigeration cycle is increased, and the difference between the storage temperature of the food and the cool air temperature is reduced, thereby suppressing temperature fluctuation and drying.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the refrigerant flow variable device is configured so that the temperature difference between the evaporation temperature of each evaporator and the internal temperature is 5 ° C. or less. , The temperature fluctuation and drying in the cooling chamber can be further suppressed, the efficiency of the refrigeration cycle can be further improved, and energy can be saved.

[0025] The invention described in claim 4 is the invention according to claims 1 to 3.
In the invention according to any one of the above, the first evaporator and the second evaporator in order from the upstream side, the first evaporator is installed in the refrigerator compartment, the second evaporator is installed in the freezer compartment In particular, the temperature difference between the plus temperature of the refrigerator compartment and the evaporation temperature of the first evaporator is reduced, and the temperature fluctuation and the dehumidifying action of the refrigerator compartment are suppressed, so that the food storage property of the refrigerator compartment is enhanced.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the evaporating temperature of the evaporator in the refrigerator is -5 to 5 ° C.
The temperature difference between the refrigerator compartment temperature and the evaporation temperature of the first evaporator is further reduced, and the temperature fluctuation and the dehumidifying action of the refrigerator compartment are suppressed, and the food storage property of the refrigerator compartment is further enhanced.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, during rapid freezing of the freezing chamber, the throttle amount of the refrigerant flow variable device is reduced to lower the evaporation temperature of the evaporator in the freezing chamber. In addition, the temperature of cold air supplied to the freezing room is lowered, and the freezing speed of food and the like is increased, and the effect of quick freezing is enhanced.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a refrigerator according to the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a refrigeration cycle diagram of Embodiment 1 of a refrigerator according to the present invention. FIG. 2 is a Mollier diagram of a refrigeration cycle of the refrigerator of the embodiment.

In FIG. 1, reference numeral 22 denotes a compressor, 23 denotes a condenser, 24 denotes a first evaporator, 25 denotes a second evaporator, and 26 denotes a third evaporator, which are connected in series. 27 is a capillary tube, the outlet of the condenser 23 and the first evaporator 2
4 is connected to the entrance. 28 is a refrigerant flow variable device provided between the first evaporator 24 and the second evaporator 25,
Reference numeral 29 denotes a refrigerant flow variable device provided between the second evaporator 25 and the third evaporator 26. Refrigerant flow rate variable device 2
For example, electric expansion valves 8 and 29 are used. Three
Reference numeral 0 denotes a suction pipe which connects the outlet of the third evaporator 26 and the compressor 22 to form an annular refrigeration cycle.

The first evaporator 24 is connected to the refrigerator body 3
In the first cooling chamber 32 having the highest set temperature, the second evaporator 25 is provided in the second cooling chamber 33 having the next highest set temperature, and the third evaporator 26 is provided in the first cooling chamber 33 having the highest temperature. It is installed in the lower third cooling chamber 34.

Reference numeral 35 denotes a first blower provided in the first cooling chamber 32, 36 denotes a second blower provided in the second cooling chamber 33, and 37 denotes a first blower provided in the third cooling chamber 34. Three blowers. 38 is a first evaporator temperature detecting means provided near the outlet of the first evaporator 24, 39 is a first cooling chamber 32
It is a first cooling chamber temperature detecting means for detecting the temperature inside the cooling chamber.
Reference numeral 40 denotes a second evaporator temperature detecting means provided near the outlet of the second evaporator 25, and reference numeral 41 denotes a second cooling chamber temperature detecting means for detecting a temperature in the second cooling chamber 33. Reference numeral 42 denotes third evaporator temperature detecting means provided near the outlet of the third evaporator 26, and reference numeral 43 denotes third cooling chamber temperature detecting means for detecting the temperature in the third cooling chamber 34.

Reference numeral 44 denotes control means, which is a first evaporator temperature detecting means 38, a first cooling chamber temperature detecting means 39, a second evaporator temperature detecting means 40, a second cooling chamber temperature detecting means 41,
The opening degree of the refrigerant flow variable devices 28 and 29 is controlled by the third evaporator temperature detecting means 42 and the third cooling chamber temperature detecting means 43.

The operation of the refrigeration cycle configured as described above will be described below.

The refrigerant compressed by the compressor 21 is supplied to the condenser 23
And liquefies into the capillary tube 27. The depressurized liquid refrigerant enters the first evaporator 24 and the second evaporator 25, and a part of the liquid refrigerant at a saturation temperature of a pressure corresponding to the throttle amount (opening degree) of the refrigerant flow variable devices 28 and 29. Evaporates. The evaporating temperature of the first evaporator 24 becomes lower because the closer the opening of the refrigerant flow rate varying device 28 becomes, the closer the evaporating pressure of the second evaporator 25 becomes. Conversely, if the opening degree of the refrigerant flow variable device 28 is reduced, the pressure in the first evaporator 24 increases, and the evaporation temperature also increases.

The evaporating temperatures of the first evaporator 24 and the second evaporator 25 are controlled by controlling the degree of opening of the refrigerant flow variable devices 28 and 29 by the control means 44. Evaporator temperature detecting means 38, first cooling chamber temperature detecting means 39, second evaporator temperature detecting means 40, second cooling chamber temperature detecting means 41, third evaporator temperature detecting means 42, Of the cooling chamber temperature detecting means 43.

The remainder of the refrigerant further depressurized by the refrigerant flow variable devices 28 and 29 evaporates in the third evaporator 26 at an evaporation temperature corresponding to the suction pressure (low pressure) of the compressor 22 and passes through the suction pipe 30. Return to the compressor 21.

The above operation will be described with reference to the Mollier diagram shown in FIG. 2. The condenser 23 reduces the pressure from the point A to the point B, the capillary tube 27 reduces the pressure from the point B to the point C, and the point C reduces the first evaporator 24. The entered refrigerant evaporates at a temperature saturated to the pressure of P1. Point D is the inlet of the refrigerant flow variable device 28 and outlet E
The pressure is reduced to a point and enters the second evaporator 25 to evaporate at a temperature saturated to the pressure of P2. The point F is the inlet of the variable refrigerant flow device 29, the pressure is reduced to the point G of the outlet, and the refrigerant enters the third evaporator 26 and evaporates at the temperature saturated with the pressure of P3. Then, it is sucked into the compressor 22 at the point H and is compressed to the point A.

Here, when the opening degree of the refrigerant flow variable device 28 is reduced, the point C becomes the point C 'and the point D becomes the point D', the pressure rises to the pressure of P4, and the evaporation temperature of the first evaporator 24 also rises. I do. Conversely, when the opening degree of the refrigerant flow variable device 28 is increased, the pressure at the point C decreases and the evaporation temperature of the first evaporator 24 also decreases.

Therefore, when the first cooling chamber 32 having the highest set temperature is kept at, for example, the refrigeration temperature (0 to 5 ° C.), the opening degree of the refrigerant flow variable device 28 is controlled to control the first evaporator 24. By increasing the evaporation temperature and reducing the temperature difference between the cooling chamber and the evaporator, the supercooling of the temperature of the cool air sent by the first blower 35 is suppressed, the temperature fluctuation in the cooling chamber is reduced, and the dehumidifying action can be suppressed. it can. For this reason, the storage quality of the food stored in the first cooling chamber 32 is improved. In addition, by increasing the evaporation temperature appropriately, the efficiency of the refrigeration cycle is increased and energy is saved.

Further, the opening degrees of the refrigerant flow variable devices 28 and 29 are controlled, and the evaporation temperatures of the first evaporator 24 and the second evaporator 25 are periodically (for example, about once an hour) + 5 ° C. ~ 1
By setting the temperature to about 0 ° C., a special heating device is not required, the temperature rise in the cooling chamber can be suppressed, the evaporator can be defrosted, and the heating device can be rationalized.

When the load on the cooling chamber is large or at the initial stage of installation, the opening degree of the refrigerant flow variable devices 28 and 29 is controlled to increase the amount of circulating refrigerant so that the predetermined temperature can be reached in a short time. it can.

The third cooling chamber 34 is maintained at a predetermined temperature, for example, a freezing temperature (-20 ° C.) by the third evaporator 26 and the third blower 37, but the load of the cooling chamber is reduced. When it becomes larger, the first evaporator temperature detecting means 38,
The first cooling chamber temperature detecting means 39, the second evaporator temperature detecting means 40, the second cooling chamber temperature detecting means 41, the third evaporator temperature detecting means 42, and the third cooling chamber temperature detecting means 43 By controlling the degree of opening of the refrigerant flow variable devices 28 and 29 and increasing the amount of circulating refrigerant, a predetermined temperature can be achieved in a short time. Conversely, when the load on the cooling chamber is small, the opening degree of the refrigerant flow variable devices 28 and 29 is controlled to reduce the amount of circulating refrigerant, thereby improving system efficiency and saving energy.

Further, the first cooling chamber 32 and the second cooling chamber 3
3 can control the opening degree of the refrigerant flow variable devices 28 and 29 to freely set the temperature from refrigeration to freezing, and can provide a highly convenient refrigerator according to the demand of the user.

Further, the first evaporator temperature detecting means 38, the first cooling chamber temperature detecting means 39, the second evaporator temperature detecting means 40, the second cooling chamber temperature detecting means 41, the third evaporator temperature detecting means The information obtained by the detecting means 42 and the third cooling chamber temperature detecting means 43 is determined by the control means 44, and the difference between the evaporation temperature of the evaporator in each cooling chamber and the temperature in the cooling chamber is set to 5 ° C. or less. By controlling the degree of opening of the refrigerant flow variable devices 28 and 29, it is possible to further suppress temperature fluctuations and dehumidifying effects in each cooling chamber, and to further improve system efficiency by setting an appropriate evaporation temperature and refrigerant circulation amount, thereby conserving energy. Can be achieved.

(Embodiment 2) FIG. 3 is a refrigeration cycle diagram of Embodiment 2 of a refrigerator according to the present invention. In FIG. 3, the refrigerator main body 45 includes a refrigerator compartment 46 and a freezer compartment 47. The first evaporator 48 is installed in the refrigerator compartment 46, and the second evaporator 49 is installed in the freezer compartment 47. Reference numeral 50 denotes a refrigerant flow variable device such as an electric expansion valve, which is provided between the first evaporator 48 and the second evaporator 49. 51 is a compressor, 52 is a condenser, 53 is a capillary tube, 54 is a suction pipe connecting the second evaporator 49 and the compressor 51, and the first evaporator 48 and the second evaporator 49 are connected in series. To form an annular refrigeration cycle.

Reference numeral 55 denotes the first evaporator 48 and the refrigerator 4
6 is the first blower for forcibly exchanging heat with the air,
Reference numeral 56 denotes a second blower for forcibly exchanging heat between the second evaporator 49 and the air in the freezing room 47. 57 is a first evaporator temperature detecting means provided near the outlet of the first evaporator 48;
Reference numeral 8 denotes a refrigerator compartment temperature detecting means for detecting the temperature in the refrigerator compartment 46. 59 is a second evaporator temperature detecting means provided near the outlet of the second evaporator 49, and 60 is a freezing room temperature detecting means for detecting the temperature in the freezing room 47.

Reference numeral 61 denotes a control means. The first evaporator temperature detection means 57, the refrigerator temperature detection means 58, the second evaporator temperature detection means 59, and the freezing room temperature detection means 60 open the refrigerant flow rate variable device 50. Control the degree.

With the above configuration, the temperature difference between the temperature of the refrigerator compartment 46 and the evaporation temperature of the first evaporator 48 can be kept small, and the efficiency of the refrigeration cycle can be increased. Further, the temperature fluctuation of the refrigerator compartment 46 can be reduced.
Furthermore, the dehumidifying effect on the inside of the refrigerator compartment 46 can be suppressed, and the refrigerator compartment 46 can be kept high in humidity to suppress the drying of the food.

Further, by controlling the opening of the refrigerant flow variable device 50 and periodically (eg, about once an hour), the evaporating temperature of the first evaporator 48 is set to + 5 ° C. to 10 ° C. The first evaporator 48 can be defrosted without requiring a special heating device, suppressing the temperature rise of the refrigerator compartment 46,
The heating device can be rationalized.

When the load of the refrigerator compartment 46 is large or in the initial stage of installation, the predetermined temperature can be reached in a short time by controlling the opening degree of the refrigerant flow variable device 50 and increasing the refrigerant circulation amount. .

Further, the refrigerating chamber 46 can be provided with a function as a temperature switching chamber capable of controlling the opening degree of the refrigerant flow variable device 50 to freely set the temperature from refrigeration to freezing. It is also possible to provide a highly convenient refrigerator according to the requirements.

On the other hand, the freezing room 47 is maintained at a predetermined temperature, for example, a freezing temperature (−20 ° C.) by the second evaporator 49 and the second blower 56, but the load on the freezing room is increased. In some cases, the opening degree of the refrigerant flow variable device 50 is controlled by the first evaporator temperature detecting means 57, the refrigerator temperature detecting means 58, the second evaporator temperature detecting means 59, and the freezing room temperature detecting means 60, thereby circulating the refrigerant. By increasing the amount, a predetermined temperature can be reached in a short time. Conversely, the refrigerator compartment 46,
When the load on the freezing chamber 47 is small, the opening degree of the refrigerant flow variable device 50 is controlled to reduce the amount of circulating refrigerant, thereby improving system efficiency and saving energy.

The information obtained by the first evaporator temperature detecting means 57 and the refrigerating room temperature detecting means 58 is judged by the control means 61, and the evaporating temperature of the first evaporator 48 in the refrigerating room 46 is reduced by -5. By controlling the opening degree of the refrigerant flow variable device 50 so as to control the temperature in the range of up to 5 ° C., the difference between the evaporation temperature of the first evaporator 48 and the temperature of the refrigerator compartment 46 is further reduced. Temperature fluctuation can be further reduced. Further, since the evaporation temperature of the first evaporator 48 is higher, the dehumidifying effect on the refrigerator compartment 46 can also be suppressed, and the refrigerator compartment 46 can be kept more humid to suppress the drying of food and further improve the storage quality. it can.

Further, in the freezer compartment 47, when it is necessary to rapidly freeze foods for home freezing or the like,
First evaporator temperature detecting means 57, refrigerator compartment temperature detecting means 5
8. The information obtained by the second evaporator temperature detecting means 59 and the freezing room temperature detecting means 60 is determined by the control means 61,
By narrowing the opening of the refrigerant flow variable device 50 so as to lower the evaporation temperature of the second evaporator 49, the second evaporator 4
9, the temperature of the cold air supplied to the freezer compartment 47 by the second blower 56 is lowered, and rapid freezing is enabled.

[0056]

As described above, according to the first aspect of the present invention, there are provided a plurality of cooling chambers for cooling and storing food, wherein a compressor, a condenser, and a plurality of evaporators connected in series are provided. Since a refrigerant flow variable device is provided and a plurality of evaporators are installed in a cooling chamber having a higher set temperature in order from the upstream side of the refrigeration cycle, the evaporation temperature of each evaporator is arbitrarily varied and controlled,
Cooling close to the set temperature of each cooling chamber can increase the efficiency of the refrigeration cycle and save energy. In addition, it is possible to improve the storage quality of food by suppressing temperature fluctuation and drying.

Further, the degree of opening of the refrigerant flow variable device is controlled periodically, and the evaporator can be defrosted without requiring a special heating device, so that the heating device can be rationalized.

In addition, at the time of high load in the cooling room or at the beginning of installation,
By controlling the opening degree of the refrigerant flow variable device to increase the amount of circulating refrigerant, it is possible to reach a predetermined temperature in a short time. Conversely, when the cooling chamber is lightly loaded, the degree of circulation of the refrigerant is reduced by controlling the degree of opening of the variable refrigerant flow device, thereby conserving energy by improving system efficiency.

Further, the opening degree of the refrigerant flow variable device is controlled,
By setting each cooling chamber freely from the temperature of refrigeration to the temperature of freezing, it is possible to provide a refrigerator with high convenience for the user.

According to a second aspect of the present invention, there is provided a cooling room for cooling and storing food, wherein a compressor, a condenser, a plurality of evaporators connected in series, a condenser and an evaporator are provided. Since a capillary tube provided between them and a refrigerant flow rate variable device provided between a plurality of evaporators were provided, and a plurality of evaporators were installed in a cooling chamber having a higher set temperature in order from the upstream side of the refrigeration cycle. The evaporation temperature of the vessel can be more reliably changed,
By controlling, the efficiency of the refrigeration cycle can be further increased by cooling closer to the set temperature of each cooling chamber, and the storage quality of the food can be further enhanced.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the refrigerant flow variable device is configured so that the temperature difference between the evaporation temperature of each evaporator and the internal temperature is 5 ° C. or less. , The temperature fluctuation and drying in the cooling chamber can be suppressed more stably, the efficiency of the refrigeration cycle can be further improved, and energy can be saved.

[0062] The invention described in claim 4 is the invention according to claims 1 to 3.
In the invention according to any one of the above, the first evaporator and the second evaporator in order from the upstream side, the first evaporator is installed in the refrigerator compartment, the second evaporator is installed in the freezer compartment Therefore, the temperature difference between the plus temperature of the refrigerator compartment and the evaporation temperature of the first evaporator is reduced, and the temperature fluctuation and the dehumidifying action of the refrigerator compartment are suppressed, so that the food storage property of the refrigerator compartment is improved.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, the evaporating temperature of the evaporator in the refrigerator compartment is set to -5 to -5.
Since the control is performed in the range of ° C., the temperature difference between the refrigerator compartment temperature and the evaporation temperature of the first evaporator is further reduced, and the temperature fluctuation and the dehumidifying action of the refrigerator compartment are suppressed, and the food storage property of the refrigerator compartment is further enhanced.

According to a sixth aspect of the present invention, in the fourth aspect of the invention, when the freezing compartment is rapidly frozen, the amount of restriction of the variable refrigerant flow rate device is reduced to lower the evaporation temperature of the evaporator in the freezing compartment. , The effect of quick freezing of food etc. is enhanced.

[Brief description of the drawings]

FIG. 1 is a refrigeration cycle diagram of Embodiment 1 of a refrigerator according to the present invention.

FIG. 2 is a Mollier diagram of a refrigeration cycle of the refrigerator of the embodiment.

FIG. 3 is a refrigeration cycle diagram of Embodiment 2 of the refrigerator according to the present invention.

FIG. 4 is a sectional view of a refrigerator showing a conventional example.

FIG. 5 is a refrigeration cycle diagram of a refrigerator showing a conventional example.

FIG. 6 is a block diagram of an operation control circuit of a refrigerator showing a conventional example.

[Explanation of symbols]

 22 Compressor 23 Condenser 24 First Evaporator 25 Second Evaporator 26 Third Evaporator 27 Capillary Tube 28, 29 Refrigerant Flow Rate Variable Device 32 First Cooling Room 33 Second Cooling Room 34 Third Cooling room 44 Control means 46 Refrigeration room 47 Freezing room 48 First evaporator 49 Second evaporator 50 Refrigerant flow rate variable device 51 Compressor 52 Condenser 53 Capillary tube 61 Control means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Yamada 4-5-2-5 Takaidahondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. (72) Hideki Fukui 4-chome Takaidahondori, Higashiosaka-shi, Osaka No.2 No.5 Matsushita Refrigeration Co., Ltd. F term (reference) 3L045 AA03 BA01 CA02 DA02 EA01 GA07 HA02 HA06 JA12 MA02 MA04 PA01 PA04 PA05 PA06

Claims (6)

[Claims] 1. A refrigeration cycle comprising a plurality of cooling chambers for cooling and storing food, comprising a compressor, a condenser, a plurality of evaporators connected in series, and a variable refrigerant flow device, A refrigerator characterized in that the plurality of evaporators are installed in a cooling room having a higher set temperature in order from an upstream side of a refrigeration cycle. 2. A refrigerator having a plurality of cooling chambers for cooling and storing food, comprising a compressor, a condenser, a plurality of evaporators connected in series, and a capillary provided between the condenser and the evaporator. A refrigeration cycle comprising a tube and a refrigerant flow variable device provided between the plurality of evaporators,
A refrigerator characterized in that the plurality of evaporators are installed in a cooling room having a higher set temperature in order from an upstream side of a refrigeration cycle. 3. The throttle amount of the variable refrigerant flow device is controlled so that the temperature difference between the evaporation temperature of each evaporator and the temperature in the refrigerator is set to 5 ° C. or less. Refrigerator. 4. A first evaporator and a second evaporator are arranged in this order from an upstream side, wherein the first evaporator is installed in a refrigerator compartment and the second evaporator is installed in a freezer compartment. Claim 1
The refrigerator according to any one of claims 1 to 3. 5. The evaporator in the refrigerator compartment has an evaporation temperature of -5 to 5 ° C.
The refrigerator according to claim 4, wherein the control is performed in the range of: 6. The refrigerator according to claim 4, wherein, during rapid freezing of the freezer, the amount of throttle of the refrigerant flow variable device is reduced to lower the evaporation temperature of the evaporator in the freezer.