JP2002081839A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator having a plurality of storing chambers and comprising a plurality of evaporators in which it keeps a high cooling efficiency and shows a high storing quality of food. SOLUTION: There are provided a plurality of storing chambers 2, 3, and evaporators 9, 11 having a plurality of different evaporating temperature regions. A fin shape of the evaporator 11 having a relative low evaporating temperature region is a right flat surface. The evaporator 9 for a refrigerator chamber having a relative high evaporating temperature region comprises a refrigerant pipe 21 and fins 22 having an incremental area different from the right flat surface. A plurality of fins 22 are assembled into a plurality of straight pipes of the refrigerant pipes 21 in such a way that they become in parallel with a flow of cold air, so that a heat exchanging efficiency at the air supplying side is increased and a cooling capability is increased, resulting in that a variation in temperature for the stored food can be kept low and storing quality of the food can be kept high.

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 storage rooms and a plurality of evaporators.

[0002]

2. Description of the Related Art In recent years, refrigerators have been proposed in which a plurality of storage compartments are provided with an evaporator and each is cooled.

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

A conventional refrigerator evaporator is disclosed in Japanese Patent Publication No. 56-29606.

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

FIG. 17 is a side sectional view showing a schematic structure of a refrigerator showing a conventional example. FIG. 18 is a refrigeration cycle diagram showing a conventional example. FIG. 19 shows a conventional evaporator of a refrigerator.

In FIG. 17, reference numeral 101 denotes a refrigerator main body, which is composed of a freezer compartment 102 and a refrigerator compartment 103 which are partitioned so as not to mix cold air therebetween. Freezer 1
02, a first evaporator 104 is installed. In the refrigerator compartment 103, a second evaporator 105 is installed. Reference numeral 106 denotes a first blower provided adjacent to the first evaporator 104, and reference numeral 107 denotes a second blower provided adjacent to the second evaporator 105. 108 is the refrigerator body 1
01 is a compressor provided on the lower rear side.

In FIG. 18, reference numeral 109 denotes a condenser;
110 is a capillary tube as a decompressor, 111 is a refrigerant tube connecting the first evaporator 104 and the second evaporator 105, and includes a compressor 108, a condenser 109, a capillary tube 110, and a first evaporator 104. , Refrigerant pipe 111,
The second evaporator 105 is connected in order to form a closed circuit.

In FIG. 19, a meandering refrigerant pipe 1 is shown.
The fin pitches of the continuous fins 113 and 114 arranged in the twelve straight pipe portions are arranged so as to be shifted from sparse to dense in the airflow direction over several stages.

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

The refrigerant compressed by the compressor 108 and radiated and liquefied by the condenser 109 is decompressed by the capillary tube 110, partially evaporated in the first evaporator 104, and passed through the second evaporator 105. While the remainder evaporates, each performs a heat exchange action. Thereafter, the refrigerant in the gas state is supplied to the compressor 1
08 is inhaled. Such a refrigeration cycle is repeated as the compressor 108 is driven.

Further, due to the forced ventilation of the first blower 106 and the second blower 107, the air in the freezing room 102 and the refrigerating room 103 is heat-exchanged in the first evaporator 104 and the second evaporator 105. You. Each of the first and second blowers 106 and 107 is operated and stopped by the temperature detectors (not shown) provided in the freezing room 102 and the refrigerator compartment 103, or the compressor 108 is operated and stopped by the temperature sensors (not shown). The chamber is controlled to a predetermined temperature.

[0013]

However, the above-mentioned conventional configuration has a first evaporator 104 and a second evaporator 105.
Are connected by a refrigerant pipe 111 having no decompression function,
The evaporation temperature of each evaporator is almost the same, and
02, the cooling control of the refrigerator compartment 103 is performed by the first blower 106
And the operation control of the second blower 107, especially in the refrigerator compartment 103 where the temperature difference from the evaporation temperature is large, the cooling efficiency is lowered by cooling with low-temperature cold air more than necessary, and wasteful power is consumed. In addition, there is a drawback that indoor temperature fluctuation and humidity decrease are caused, temperature stress is applied to the food, and drying is promoted to deteriorate the food quality.

In the above-described conventional refrigerator evaporator, the fin pitches of the fins arranged in the straight pipe portion of the refrigerant pipe are set to be sparse and dense in the air flow direction so that frost does not concentrate on a part of the fins. , The surface area of the evaporator is reduced, the cooling capacity becomes insufficient during operation under high load conditions, and the temperature in the refrigerator increases. On the other hand, if the evaporator is enlarged to increase the surface area in order to solve the cooling capacity shortage, there is also a problem that the internal volume of the refrigerator decreases.

The present invention has been made to solve the conventional problems, and an object of the present invention is to provide a refrigerator which ensures a cooling capacity without changing the size of the outer shape of the evaporator. And by making the evaporation temperature of the evaporator close to the set temperature of the cooling chamber, the cooling efficiency is high,
An object of the present invention is to provide a refrigerator having high food storage quality.

[0016]

According to a first aspect of the present invention, there is provided an evaporator having a plurality of storage chambers and a plurality of evaporators having different evaporation temperature zones, and having a relatively low evaporation temperature zone. The fin shape of the evaporator in the relatively high evaporating temperature zone is a shape with a different area from the straight surface. As a result, the heat exchange efficiency on the air side is increased, the cooling capacity of the evaporator is increased, and the temperature difference between the inside of the refrigerator and the evaporation temperature can be reduced.

According to a second aspect of the present invention, in the first aspect of the present invention, since the shape subjected to the area increase processing is a shape subjected to the bending processing in the air flow direction, the surface area in the pipe is increased. The heat exchange efficiency in the pipe increases due to the increase in the heat transfer coefficient and the heat transfer coefficient, the cooling capacity in the evaporator can be increased, and the temperature difference between the inside and the evaporation temperature can be reduced.

According to a third aspect of the present invention, in the first or the second aspect of the present invention, the fin shape of the evaporator in the relatively high evaporating temperature zone is defined by a straight plane and a straight plane in the width direction. It is a combination of shapes with different area increase processing, and the fin shape can be used properly in the part with a large amount of frost and the part with a small amount of frost, and even in the frosted state, the ventilation of the entire evaporator can be secured A decrease in cooling capacity during frost can be suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the fin shape of the evaporator in the relatively high evaporation temperature zone is a straight plane at the center in the width direction, and the left and right sides are formed. The part has a shape that has been subjected to an area increase process different from a straight plane, so that clogging in the central part, which generally has a large amount of passing air and a large amount of frost, is suppressed, and the cooling of the evaporator as a whole in practical use Capability is not easily reduced.

According to a fifth aspect of the present invention, in the first or second aspect, a groove is provided on the inner surface of the pipe of the evaporator. As the rate increases, the surface area inside the tube and the heat transfer coefficient increase, so that the heat exchange efficiency in the tube increases, thereby increasing the cooling capacity of the evaporator and further reducing the temperature difference between the inside and the evaporating temperature.

According to a sixth aspect of the present invention, there is provided the invention according to any one of the first to fifth aspects, wherein
Since the fin pitch of the evaporator in the relatively high evaporation temperature zone is smaller than the fin pitch of the evaporator in the relatively low evaporation temperature zone, the cooling capacity of the evaporator in the relatively high evaporation temperature zone is increased, and evaporation is performed. The temperature can be set high, and the temperature difference between the inside of the refrigerator and the evaporation temperature can be reduced without causing frost to accumulate on the fins and causing a decrease in cooling capacity.

According to a seventh aspect of the present invention, there is provided the invention according to any one of the first to sixth aspects, wherein
To provide a refrigerator having a high cooling efficiency and a high food storage quality in which an evaporator in a relatively high evaporation temperature zone is used for cooling a refrigerator compartment and an evaporator in a low evaporation temperature zone is used for cooling a freezer compartment. Can be.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a refrigerator according to the present invention will be described below with reference to the drawings. In addition,
The same reference numerals are given to the same components as those in the related art, and the detailed description is omitted.

(Embodiment 1) FIG. 1 is a sectional view of a refrigerator according to Embodiment 1 of the present invention. FIG. 2 is a front view of an evaporator for cooling the refrigerator compartment of the refrigerator according to the embodiment. FIG. 3 is a perspective view of fins of the evaporator for cooling the refrigerator compartment of the embodiment. 4, 6, 8,
FIG. 10 is a front view of another evaporator for cooling the refrigerator of the embodiment. FIGS. 5, 7, and 9 are perspective views of other fins of the evaporator for cooling the refrigerator compartment of the embodiment.

1 to 10, reference numeral 1 denotes a refrigerator main body, in which at least one refrigerator compartment 2 is disposed in an upper portion and at least one freezer compartment 3 is disposed in a lower portion.
And a heat insulating door 8.

In the refrigerating cycle, the compressor 6, the condenser 7, the first decompression means 10, the refrigerating compartment evaporator 9, the expansion valve 20, and the refrigerating compartment evaporator 11 are sequentially connected. A diversion connection 19 provided between the evaporator 9 and the refrigerating compartment is connected to a junction 15 provided between the expansion valve 20 and the evaporator 11 in the freezing room, and the second decompression means 12 is connected. It is constituted by the provided bypass path.

The connecting pipe 16 for connecting the refrigerating compartment evaporator 9, the expansion valve 20, and the freezing compartment evaporator 11 has a diameter which does not cause a large resistance of refrigerant passage, and for example, a pipe having a diameter substantially equal to the diameter of the evaporator is used.

The refrigerating compartment evaporator 9 is disposed in the refrigerating compartment 2, for example, on the inner surface of the refrigerating compartment. A room fan 13 and a refrigeration duct 17 are provided.

Here, the refrigerator compartment evaporator 9 is connected to the refrigerant pipe 21.
And a fin 2 having a shape different from that of a straight plane and having been subjected to an area increase processing
2, and a plurality of fins 22 are incorporated in a plurality of straight pipe portions of the refrigerant pipe 21 so as to be parallel to the flow of the cool air. The fin having a shape obtained by performing an area increase processing different from a straight plane is a shape obtained by performing a bending processing in an airflow direction, for example, a corrugated fin 22a,
Z-shaped fin 22b, U-shaped fins 22c, 22d
It is.

The refrigerating compartment evaporator 9 includes a combination of a fin 23 having a straight plane shape and a fin 22 having a shape subjected to the above-described area increase processing as shown in FIG. In the embodiment, in particular, the center part in the width direction of the evaporator is a fin 23 of a straight plane shape, and the left and right sides are fins 22 of a shape subjected to area increase processing.

The freezer compartment evaporator 11 is disposed in the freezer compartment 3, for example, at the back of the freezer compartment, and has a refrigerator near the freezer compartment 3 in which air in the freezer compartment 3 is passed through the freezer compartment evaporator 11 and circulated. A room fan 14 and a refrigeration duct 18 are provided. And
The fins forming the freezer evaporator 11 are formed in a straight plane shape, and a predetermined fin pitch in consideration of frost formation is secured.

The expansion valve 20 adjusts the flow of the refrigerant from the refrigerator compartment evaporator 9 to the freezer compartment evaporator 11 by opening the valve, and is provided in the freezer compartment 3. Junction 15
Is also provided in the freezing room 3, for example, near the expansion valve 20. One branch connection 19 is located in the refrigerator compartment 3, for example, near the refrigerator compartment evaporator 9.

The compressor 6 and the condenser 7 are arranged in the machine room 5 at the lower back of the refrigerator body 1.

The refrigerating compartment 2 and the freezing compartment 3 are provided with temperature detecting means (not shown) for detecting room temperature, and the compressor 6, the expansion valve 20 and the refrigerating compartment fan 1 are detected by the temperature detecting means.
3 and control means (not shown) for controlling the freezer compartment fan 14.

With respect to the refrigerator configured as described above,
The operation will be described below.

When the temperature in the freezing compartment 3 rises, the temperature detecting means detects that the temperature exceeds a predetermined temperature. Upon receiving this signal, the control means operates the compressor 6, the freezer compartment fan 14, and the expansion valve 20. The high-temperature and high-pressure refrigerant discharged by the operation of the compressor 6 is condensed and liquefied by the condenser 7, decompressed by the first decompression means 10, and arrives at the branch connection 19.

When the temperature detecting means of the refrigerating compartment 2 exceeds a predetermined temperature, the expansion valve 20 performs an opening operation, and the refrigerant reaches the refrigerating compartment evaporator 9. The operation of the refrigerating compartment fan 13 sucks air in the refrigerating compartment 2 and actively exchanges heat with the refrigerating compartment evaporator 9 having the fins 22 having a shape different from a straight plane to discharge as lower-temperature air. Is done.

As a result, when the temperature of the air in the refrigerator compartment 2 decreases and the temperature detecting means detects that the temperature is lower than the predetermined temperature, the expansion valve 20 is closed by the control means. Also,
Similarly, the refrigerating compartment fan 13 operates when the temperature detecting means of the refrigerating compartment 2 exceeds a predetermined temperature, and stops when the temperature detecting means is lower than the predetermined temperature.

When the expansion valve 20 is closed, the refrigerant flows into the second pressure reducing means 12 from the branch connection 19, and is further reduced in pressure and arrives at the freezer evaporator 11. By the operation of the freezing room fan 14, the air in the freezing room 3 is cooled by the freezing duct 18.
The refrigerant is positively exchanged heat, and the refrigerant evaporates in the freezer evaporator 11. The vaporized refrigerant is sucked into the compressor 6 again. The heat-exchanged air is discharged as lower-temperature air, and when the temperature of the air in the freezing room 3 decreases and the temperature detecting unit detects that the temperature is lower than a predetermined temperature, the control unit controls the compressor 6 and the freezing room fan. 14 and the expansion valve 20 is operated and closed.

When the temperature detecting means of the refrigerating compartment 2 detects that the temperature exceeds a predetermined temperature, and the expansion valve 20 is in an open state, the refrigerant reaches the refrigerating compartment evaporator 9 from the branching connection 19. Then, it flows into the freezer evaporator 11 via the expansion valve 20. Further, a part of the refrigerant flows into the second decompression means 12 at the branch connection 19, merges with the flow of the refrigerant at the merge connection 15, and flows into the freezer evaporator 11. The refrigerant evaporated and vaporized in the refrigerator compartment evaporator 9 and the freezer compartment evaporator 11 is sucked into the compressor 6 again.

Here, when the difference between the temperature of the refrigerator compartment 2 and the predetermined temperature is large, the expansion valve 20 increases the opening of the valve to increase the flow rate of the refrigerant in the refrigerator compartment evaporator 9, The cooling capacity of the refrigerator evaporator 9 is increased. When the difference between the temperature of the refrigerating compartment 2 and the predetermined temperature is small, the expansion valve 20 reduces the opening degree of the valve to reduce the flow rate of the refrigerant in the refrigerating compartment evaporator 9, thereby reducing the refrigerating compartment evaporator. 9, the cooling capacity is reduced. By the operation of the refrigerator compartment fan 13, the air in the refrigerator compartment 2 is sucked through the refrigerator duct 17, and the heat is actively exchanged, and a part of the refrigerant evaporates in the refrigerator compartment evaporator 9. The heat-exchanged air is discharged, and when the temperature detecting means detects that the temperature is lower than a predetermined temperature, the control means stops the refrigerator compartment fan 13 and operates and closes the expansion valve.

Similarly, when the freezing room fan 14 is operated to cool the freezing room 3 and the temperature detecting means detects that the temperature is lower than a predetermined temperature, the control means stops the compressor 6 and the freezing room fan 14 and the expansion valve. Activate and close.

The cooling operation is performed by repeating the above-described operation to adjust the temperature of the refrigerator compartment 2 and the freezer compartment 3. By the operation of the expansion valve 20, the evaporation temperature of the refrigerator compartment 2 and the refrigerator compartment evaporator 9 is increased. Is kept relatively small.

The fins of the freezer evaporator, which has a relatively low evaporation temperature range, have a straight plane shape and a predetermined fin pitch in consideration of frost formation. Even if frost is formed in the freezer evaporator when it is opened or when moisture from food occurs, the cooling capacity can be secured for a certain period without clogging the fins immediately, and the efficiency of frost formation can be improved relatively inexpensively. .

The refrigerant flowing in the refrigerant pipe 21 of the refrigerator compartment evaporator 9 in a relatively high evaporation temperature zone undergoes heat exchange via the refrigerant pipe 21 or the fins 22 to cool the surrounding air. . At this time, since the fins 22 have a shape obtained by performing an area increasing process different from the straight plane, the heat exchange efficiency on the air side increases due to an increase in the surface area on the air side and an increase in the heat transfer coefficient. The cooling capacity can be increased without changing the size of the outer shape as compared with the fin having the shape. In other words, since the temperature inside the refrigerator can be suppressed from rising without lowering the evaporation temperature of the refrigerator evaporator 9 excessively, the temperature fluctuation to the stored food can be reduced, and the storage quality of the food can be kept high.

Further, as shown in FIG. 10, the refrigeration compartment evaporator 9 is formed by combining a fin 23 having a straight plane shape and a fin 22 having a shape subjected to area increase processing in the width direction of the refrigeration compartment evaporator 9. The portion where the amount of frost is large is a fin 23 having a straight plane shape.
If the fin shape is selectively used as the fin 22 having a reduced area of frost formation, the area of the fin 22 is increased so that the ventilation of the entire evaporator can be ensured even in the frost state, and the cooling capacity at the time of frost reduction is reduced. Is suppressed.

Further, if the central portion in the width direction of the evaporator is a fin 23 having a straight plane shape and the left and right side portions are formed as fins 22 having an increased area, a general arrangement relationship with the refrigerator compartment fan 13 can be obtained. Since the amount of passing air is large, clogging in the central portion where the amount of frost is large can be suppressed. In other words, the fins 23 having a straight plane shape have relatively smaller airflow resistance than the fins 22 having a shape subjected to area increase processing. The cooling capacity of the entire vessel does not suddenly decrease, and the practical cooling efficiency can be increased.

The above-described embodiment of the evaporator is effective in a refrigerating room having a large room capacity and a large amount of moisture from the storage and moisture from the outside air infiltrating, but is particularly effective only in an evaporator for a refrigerating room. The present invention is not limited thereto, and a certain effect can be obtained even when used for an evaporator for a freezing room.

Next, if the relatively high evaporation temperature zone is maintained at, for example, about -5.degree. C. to + 5.degree. C., the frost adhering to the refrigerator evaporator 9 during the circulation of the refrigerant is released while the circulation of the refrigerant is stopped. And the temperature difference between the refrigerator compartment and the evaporating temperature is kept relatively small, so that the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and food can be kept Storage quality can be kept high. Further, periodic defrosting by a heater or the like is unnecessary.

As described above, the refrigerator of the present embodiment has a plurality of storage rooms and a plurality of evaporators of different evaporating temperature zones, and the fin shape of the evaporator of a relatively low evaporating temperature zone is straight. And the refrigerator evaporator 9 in a relatively high evaporation temperature zone.
Is composed of a refrigerant pipe 21 and fins 22 having a shape obtained by performing an area increase processing different from a straight plane, and a plurality of fins 22 are formed on a plurality of straight pipe portions of the refrigerant pipe 21 so as to be parallel to the flow of cool air. As a result, the heat exchange efficiency on the air side is increased, the cooling capacity is increased, the temperature fluctuation in the stored food can be reduced, and the storage quality of the food can be kept high.
Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

In the present embodiment, the fin shape subjected to the area increase processing different from the straight plane is a corrugated fin 22a, a Z-shaped fin 22b, 22c, 2c.
Although a 2d U-shaped fin or a straight-plane fin 23 and a combination of these fins are shown, it is needless to say that the present invention is not limited to this.

Further, in the present embodiment, the plurality of storage rooms are a refrigerator room and a freezer room, and an evaporator of a relatively high evaporation temperature zone among a plurality of different evaporation temperature zones is arranged in the refrigerator room. As described above, it is needless to say that the same effect can be obtained by arranging in a vegetable room, a bottle room, a low-temperature new room, or a combination of these.

(Embodiment 2) FIG. 11 is a front view of an evaporator for cooling a refrigerator compartment of a refrigerator according to Embodiment 2 of the present invention. FIG. 12 is a cross-sectional view of a refrigerant pipe of an evaporator for cooling a refrigerator in the embodiment. FIG.
FIG. 15 to FIG. 15 are cross-sectional views of other refrigerant pipes of the evaporator for cooling the refrigerator compartment of the embodiment.

11 to 15, reference numeral 24 denotes a refrigerator compartment evaporator, which comprises a refrigerant pipe 25 and fins 22 having a shape which has been processed to have an area different from that of a straight plane. A plurality of fins 22 are incorporated in the tube so as to be parallel to the flow of cool air. And refrigerant pipe 2
A groove 26 is provided on the inner surface of the fifth member 5. As the groove 26, a groove 26a provided in parallel with the refrigerant flow direction of the refrigerant pipe 25, a groove 26b provided spirally in the flow direction,
Alternatively, it is composed of a plurality of grooves 26c composed of a combination of these.

With respect to the refrigerator configured as described above,
The operation will be described below.

The refrigerant flowing in the refrigerant pipe 25 of the refrigerator evaporator 24 undergoes heat exchange via the refrigerant pipe 25 or the fins 22 to cool the surrounding air. At this time, since the groove 26 is provided on the inner surface of the refrigerant pipe 25, the heat exchange efficiency in the pipe increases due to the increase in the surface area and the heat transfer coefficient in the pipe. Further, since the fins 22 have a shape obtained by processing an area different from that of a straight plane, the heat exchange efficiency on the air side increases due to an increase in the surface area on the air side and an increase in the heat transfer coefficient. The cooling capacity of the vessel can be greatly increased. Therefore, the refrigerator compartment evaporator 9
Since the temperature of the inside of the storage can be suppressed without lowering the evaporation temperature of the storage too much, the temperature fluctuation in the stored food can be reduced, and the storage quality of the food can be kept high. further,
If the relatively high evaporation temperature zone is maintained at, for example, about −5 ° C. to + 5 ° C., the refrigeration chamber can be cooled while the frost adhering to the refrigeration chamber evaporator 9 during the circulation of the refrigerant is melted while the circulation of the refrigerant is stopped. Since the temperature difference between the cooling and refrigerating compartment and the evaporation temperature is kept relatively small, the dehumidifying effect can be suppressed, the inside of the refrigerating compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity. I can do it. Further, periodic defrosting by a heater or the like is unnecessary.

As described above, the refrigerator of the present embodiment has a plurality of storage rooms and a plurality of evaporators in different evaporating temperature zones. It comprises a pipe 25 and a fin 22 having a shape obtained by performing an area increasing process different from a straight plane, and incorporating a plurality of fins 22 into a plurality of straight pipe portions of the refrigerant pipe 25 so as to be parallel to the flow of cool air. Further, since the groove 26 is provided on the inner surface of the refrigerant pipe 25, the heat exchange efficiency on the air side and the heat exchange efficiency in the pipe are increased, the cooling capacity is increased, the temperature fluctuation to the stored food can be reduced, and the food Storage quality can be kept high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

The groove 26 provided on the inner surface of the refrigerant pipe 25
In the present embodiment, the groove 26a is provided in parallel with the refrigerant flow direction of the refrigerant pipe 25, the groove 26b is provided spirally in the flow direction, or a plurality of grooves 26c formed by a combination thereof. However, it is a matter of course that the present invention is not limited to this.

(Embodiment 3) FIG. 16 is a front view of an evaporator for cooling a refrigerator compartment and a freezer compartment of a refrigerator according to Embodiment 3 of the present invention.

In FIG. 16, reference numeral 27 denotes a refrigerator evaporator.
It is composed of a refrigerant pipe 28 and a plurality of fins 29, and the pitch between the fins 29 is P1. Reference numeral 30 denotes a freezer evaporator, which is composed of a refrigerant pipe 31 and a plurality of fins 32, and the pitch between the fins 32 is P2. The outlet of the refrigerant pipe 28 of the refrigerator compartment evaporator 27 and the freezer compartment evaporator 30
Is connected to the inlet of the refrigerant pipe 31 via the expansion valve 20. Here, the pitch P1 between the fins 29 of the refrigerator compartment evaporator 27 is set smaller than P2 between the fins 32 of the freezer compartment evaporator 30.

With respect to the refrigerator configured as described above,
The operation will be described below.

The refrigerant flowing in the refrigerant pipe 28 of the refrigerator evaporator 27 exchanges heat through the refrigerant pipe 28 or the fins 29 to cool the surrounding air. Similarly, the refrigerant flowing in the refrigerant pipe 31 of the freezer evaporator 30 is the refrigerant pipe 3
1 or heat exchange is performed via the fins 32 to cool the surrounding air. Then, by controlling the valve opening of the expansion valve 20, the evaporation temperature of the refrigerator compartment evaporator 27 is reduced.
It becomes relatively higher than the evaporation temperature of 0. If the relatively high evaporation temperature zone is maintained at, for example, about −5 ° C. to + 5 ° C., the refrigeration chamber can be cooled while frost adhering to the refrigeration chamber evaporator 9 during the circulation of the refrigerant is melted while the circulation of the refrigerant is stopped. So
Even if the pitch P1 between the fins 29 of the refrigerator compartment evaporator 27 and the pitch between the fins 32 of the freezer compartment evaporator 30 are set smaller than P2, frost is accumulated on the fins of the refrigerator compartment evaporator and the cooling capacity is reduced. Don't imitate Therefore, the surface area can be increased by an amount corresponding to the reduced fin pitch, and the cooling capacity can be increased.

As described above, the refrigerator of the present embodiment has a plurality of storage rooms and a plurality of evaporators in different evaporating temperature zones, and the fins 29 of the refrigerating room evaporator 27 in a relatively high evaporating temperature zone. The pitch P1 between the fins 3 of the freezer evaporator 30
Since the pitch between the two is set to be smaller than P2, the frost does not accumulate on the fins 29 of the refrigerating room evaporator 27, and the cooling capacity does not decrease. Therefore, the surface area can be increased by an amount corresponding to the reduced fin pitch, the cooling capacity can be increased, the temperature fluctuation in the stored food can be reduced, and the storage quality of the food can be kept high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

[0064]

As described above, the first aspect of the present invention has a plurality of storage chambers and a plurality of evaporators having different evaporation temperature zones, and the fins of the evaporator having a relatively low evaporation temperature zone. The shape is a straight surface, and the fin shape of the evaporator in the relatively high evaporation temperature zone is a shape with a different area than the straight surface, so the heat exchange efficiency on the air side increases and the cooling capacity increases. In addition, the temperature fluctuation in the stored food can be reduced, and the storage quality of the food can be kept high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

The invention described in claim 2 is the same as that in claim 1.
In the invention described in the above, since the shape subjected to the area increase processing is a shape subjected to bending processing in the airflow direction, the heat exchange efficiency in the pipe is increased, the cooling capacity is increased, and the temperature fluctuation to the stored food is reduced. And keep the food storage quality high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

The third aspect of the present invention is the first aspect of the present invention.
Alternatively, in the invention according to the second aspect, the fin shape of the evaporator in the relatively high evaporation temperature zone is a combination of a shape obtained by performing an area increasing process different from a straight plane and a straight plane in the width direction. By selectively using the fin shape in the large amount portion and the small amount portion, even in the frosted state, the frosting balance of the entire evaporator can be obtained, ventilation can be ensured, and a decrease in the cooling capacity at the time of frosting can be suppressed.

According to a fourth aspect of the present invention, in the third aspect of the present invention, the fin shape of the evaporator in the relatively high evaporation temperature zone is a straight plane at the center in the width direction, and the left and right sides are formed. In the part, the area is processed differently from the straight plane, so the clogging of the central part where the amount of passing air is large and the amount of frost is large is generally suppressed, and the cooling capacity of the entire evaporator is reduced. Thus, a highly practical evaporator can be provided.

Further, the invention described in claim 5 is the first invention.
Alternatively, in the invention according to claim 2, since the groove is provided on the inner surface of the pipe of the evaporator, the heat exchange efficiency in the pipe is increased together with the heat exchange efficiency on the air side, the cooling capacity is increased, and the temperature fluctuation to the stored food is increased. And the storage quality of food can be kept high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

Further, the invention according to claim 6 is the same as the invention according to claim 1.
In the invention according to any one of claims 5 to 5, the fin pitch of the evaporator in the relatively high evaporation temperature zone is smaller than the fin pitch of the evaporator in the relatively low evaporation temperature zone. The cooling capacity of the evaporator in the high evaporating temperature zone can be increased, the evaporating temperature can be set high, and the temperature difference between the inside of the refrigerator and the evaporating temperature can be reduced without frost being accumulated on the fins and causing a decrease in the cooling capacity. Therefore, the temperature fluctuation in the stored food can be reduced, and the storage quality of the food can be kept high. Further, the dehumidifying effect can be suppressed, the inside of the refrigerator compartment can be kept at a high humidity, and the storage quality of food can be kept high in terms of humidity.

Further, the invention described in claim 7 is the first invention.
The invention according to any one of claims 6 to 6, wherein the evaporator in the relatively high evaporation temperature zone is used for cooling the refrigerator compartment, and the evaporator in the low evaporation temperature zone is used for cooling the freezer compartment. A refrigerator with high efficiency and high storage quality of food can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a refrigerator according to a first embodiment of the present invention.

FIG. 2 is a front view of an evaporator for cooling the refrigerator compartment of the refrigerator according to the embodiment.

FIG. 3 is a perspective view of a fin of an evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 4 is a front view of another evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 5 is a perspective view of another fin of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 6 is a front view of another evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 7 is a perspective view of another fin of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 8 is a front view of another evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 9 is a perspective view of another fin of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 10 is a front view of another evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 11 is a front view of an evaporator for cooling a refrigerator of a refrigerator according to a second embodiment of the present invention;

FIG. 12 is a sectional view of a refrigerant pipe of an evaporator for cooling a refrigerator in the embodiment.

FIG. 13 is a sectional view of another refrigerant pipe of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 14 is a sectional view of another refrigerant pipe of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 15 is a sectional view of another refrigerant pipe of the evaporator for cooling the refrigerator compartment of the embodiment.

FIG. 16 is a front view of an evaporator for cooling the refrigerator compartment and the freezer compartment of the refrigerator according to the third embodiment of the present invention.

FIG. 17 is a side sectional view of a conventional refrigerator.

FIG. 18 is a refrigeration cycle diagram of a conventional refrigerator.

FIG. 19 is a front view of a main part of a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Refrigerator room 3 Freezer room 9,24,27 Refrigerator room evaporator 11 Freezer room evaporator 22 Fin with increased area processing 22a Corrugated fin 22b Z-shaped fin 22c, 22d U-shaped Fins 23 Straight fins 26 Grooves 26a Grooves provided in parallel 26b Grooves provided spirally 26c Plural grooves 29 in combination

Claims (7)

[Claims] An evaporator having a plurality of storage chambers and a plurality of different evaporating temperature zones, wherein the fin shape of the evaporator having a relatively low evaporating temperature zone is a straight plane, and the evaporator having a relatively high evaporating temperature zone. A refrigerator characterized in that the fin shape of the evaporator is a shape obtained by performing an area increase processing different from a straight plane. 2. The shape subjected to the area increase processing is a shape obtained by bending in the airflow direction.
A refrigerator according to claim 1. 3. The fin shape of the evaporator in a relatively high evaporation temperature zone is a combination of a shape obtained by performing an area increase processing different from a straight plane in the width direction and a straight plane. The refrigerator according to claim 2. 4. The fin shape of the evaporator in a relatively high evaporation temperature zone is a straight plane in the center in the width direction, and the left and right sides are shaped to have a different area from the straight plane. The refrigerator according to claim 3, wherein 5. The refrigerator according to claim 1, wherein a groove is provided on an inner surface of the pipe of the evaporator. 6. The fin pitch of an evaporator in a relatively high evaporating temperature zone is smaller than a fin pitch of an evaporator in a relatively low evaporating temperature zone. A refrigerator according to any one of the preceding claims. 7. The method according to claim 1, wherein an evaporator in a relatively high evaporating temperature zone is used for cooling a refrigerator, and an evaporator in a relatively low evaporating temperature band is used for cooling a freezing room. The refrigerator according to any one of claims 6 to 13.