JP2003279220A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of a refrigerator of a structure having a thermo- compression system as a refrigerating cycle, wherein as for Freon refrigerant used as a working fluid, influence upon the environment is pointed out, and hydrocarbon-base refrigerant has combustibility, so in the case of leakage, the danger of ignition is caused to need a special countermeasure. <P>SOLUTION: As a refrigerator, a Stirling refrigerator using a reverse-Stirling cycle is used, and the stirring refrigerator is installed in the vicinity of a condenser. A cooling part of the Stirling refrigerator is fitted to the condenser disposed in a space in a refrigerating chamber. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a Stirling refrigerator.

[0002]

2. Description of the Related Art A conventional refrigerator has a vapor compression type refrigeration cycle, and a refrigerant in its refrigerant circuit is mainly a chlorofluorocarbon refrigerant or a hydrocarbon refrigerant. For fluorocarbon refrigerants, CF containing chlorine or fluorine in the molecule
Refrigerants such as C-12, HCFC-22, and HFC-134a are used.

Now, the structure of a conventional refrigerator will be described with reference to the drawings. In FIG. 37, 1 is a refrigerating room, 2 is a freezing room, 3 is a refrigerating room door, 4 is a freezing room door, 5 is an inner box made of plastic or the like, 6 is an outer box made of an iron plate or the like, and 7 is Main body heat insulation wall made of urethane foam, etc.
Reference numeral 8 denotes a partition wall that separates the refrigerating compartment 1 and the freezing compartment 2. The refrigerating compartment 1 and the freezing compartment 2 are configured in a space surrounded by the refrigerating compartment door 3, the freezing compartment door 4, the main body heat insulation wall 7, and the partition wall 8. ing.

Further, 11 is a cooler, 12 is a cooling fan installed in the vicinity of the cooler 11, 13 is a fan grill that separates the cooler 11 from the freezer compartment 2, and 13a is a freezer provided in the fan grill 13. The chamber outlet and 13b are freezer inlets. Reference numeral 14 is a damper thermostat for adjusting the amount of cold air installed in an air passage communicating with the refrigerating compartment 1, 15 is a cold air duct for the refrigerating compartment, 16 is a refrigerating compartment panel for partitioning the refrigerating compartment cold air duct 15 and the refrigerating compartment 1, 16a, Reference numeral 16b denotes a refrigerating compartment outlet provided on the refrigerating compartment panel 16. Reference numeral 17a is a refrigerating compartment return air passage suction port, and 17b is a refrigerating compartment return air passage outlet. On the other hand, 59 is a compressor installed outside the refrigerator body.

The structure of the refrigerant circuit will be described with reference to FIG. In the figure, 60 is a condenser, 61 is an expander such as a capillary tube or an electronic expansion valve, and a compressor 59, a condenser 6
0, the expander 61, and the cooler 11 are connected by a refrigerant pipe such as a copper pipe. Freon-based or hydrocarbon-based refrigerant is enclosed in this refrigerant circuit, and refrigeration of mineral oil, ester oil, etc. for the purpose of preventing seizure and wear of the sliding parts of the compressor is provided inside the compressor 59. Machine oil is enclosed.

A concrete structure of the condenser 60 is shown in FIG.
39 is a perspective view showing a state where the refrigerator door is removed,
Reference numeral 60a denotes a condenser pipe, which is a part of a condenser 60 arranged on the side of the outer box 6 in the heat insulating wall 7 on the side surface of the main body.
Reference numeral b denotes a cabinet pipe arranged around the openings of the refrigerating compartment 1 and the freezing compartment 2, and the cabinet pipe 60b is also provided with a function of preventing dew condensation of the openings.

The gas refrigerant enclosed in the refrigerant circuit is the compressor 5
9 is compressed to a high temperature and high pressure, is condensed into a liquid refrigerant in the condenser 60, is expanded into a low temperature and low pressure liquid refrigerant in the expander 61, and is cooled by the cooler 1.
When vaporized by 1, the cooling fan 12 exchanges heat with the air in the refrigerator to cool the air. The cool air is blown into the freezer compartment 2 from the freezer compartment outlet 13a of the fan grill 13, and circulates in the cooler 11 again through the freezer compartment inlet port 13b. On the other hand, the cool air that has passed through the cooling fan 12 is introduced into the refrigerating compartment cool air duct 15 via the cool air amount adjusting damper thermostat 14, and is introduced into the refrigerating compartment 1 through the refrigerating compartment outlets 16a and 16b of the refrigerating compartment panel 16. Cold room 1
After cooling, the air is circulated from the refrigerating compartment return air passage outlet 17b to the cooler 11 through the refrigerating compartment return air passage suction port 17a.

[0008]

Although the conventional refrigerator has the above-mentioned structure, the conventionally used CFC-based refrigerant is not used or discharged from the viewpoint of preventing ozone layer depletion and preventing global warming. It is regulated. Also, regarding hydrocarbon-based refrigerants that are not affected by ozone layer depletion and are considered to have little effect on global warming, since hydrocarbon-based refrigerants are flammable, in the unlikely event that the refrigerant leaks,
There is a risk of ignition and failure.

Further, the structure of the refrigerator requires a condenser and a refrigerant pipe, so that the structure is complicated and large, and the manufacturing cost increases, and it is difficult to separate the refrigerant pipe from the main body at the time of disposal. There is a problem that the refrigerant easily leaks when the compressor is removed. Furthermore, the refrigerating machine oil enclosed in the compressor is exposed to high temperatures inside the compressor to generate sludge such as refrigerating machine oil deterioration products.
There is a problem that the sludge is clogged in a capillary tube or the like to cause poor cooling.

The present invention has been made in order to solve the above problems, without using a CFC-based refrigerant that affects ozone layer depletion or global warming, or a flammable hydrocarbon-based refrigerant. In addition, it has a low cost and space saving structure, and it is easy to disassemble and separate when it is discarded in the refrigerator.
Furthermore, it aims at obtaining a refrigerator with high reliability of freezing performance.

[0011]

A refrigerator according to the present invention has a Stirling refrigerating device installed in a space near a cooler.

In addition, a plurality of Stirling refrigerators are used, and the Stirling refrigerators are installed in spaces partitioned into a plurality of compartments.

Further, a means for detecting the temperature of the Stirling refrigerator and the temperature inside the refrigerator is provided, and the Stirling refrigerator is controlled by the output of the detecting means.

Further, when the cooling unit of the Stirling refrigerator is installed in the refrigerator, the Stirling refrigerator is installed in the detachable heat insulating material independent of the heat insulating wall of the main body.

The cooling unit of the Stirling refrigerator and the defrosting means of the cooler and the means for evaporating the defrosting water are also provided.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1. Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a first embodiment of the present invention. In the figure, 1 is a refrigerating room, 2 is a freezing room, 3 is a refrigerating room door provided in front of the refrigerating room 1, 4 is a freezing room door provided in front of the freezing room 2, and 5 is made of plastic or the like. A box, 6 is an outer box made of an iron plate, 7 is a main body heat insulating wall made of urethane foam, and the like, 8 is a partition wall for partitioning the refrigerating compartment 1 and the freezing compartment 2, the refrigerating compartment door 3, the freezing compartment A refrigerating room 1 and a freezing room 2 are formed in a space surrounded by the door 4, the main body heat insulating wall 7, and the partition wall 8.

Reference numeral 9 is a Stirling refrigerator, 9a is a heat radiating portion of the Stirling refrigerator 9, and 9b is a cooling portion.
a is the space outside the refrigerator, and the cooling unit 9b
Is installed so as to penetrate the main body heat insulating wall 7 and project into the space on the far side of the freezer compartment 2. In this case, the Stirling refrigerator 9 is installed horizontally as a whole. Ten defrosting heaters are installed in the vicinity of the cooling unit 9b.
On the upper part of 0, 11 coolers are attached.
12 cooling fans are installed in the upper part of. Thirteen
Is a fan grill that separates the freezer compartment 2 from the cooler 11,
13a is a freezer outlet of the fan grill 13, 13b
Is a freezer inlet of the fan grill 13. The cool air cooled by the cooler 11 by the cooling fan 12 is sent into the freezer compartment 2 through the freezer compartment outlet 13a to cool foods and the like, and then returns to the cooler 11 through the freezer compartment inlet 13b and circulates. To do.

Further, 14 is a damper thermostat for adjusting the amount of cold air installed in an air passage communicating with the refrigerating compartment 1, 15 is a cold air duct for the refrigerating compartment, 16 is a refrigerating compartment that separates the cool air compartment 15 from the refrigerating compartment. Chamber panels 16a and 16b are refrigerating compartment outlets provided in the refrigerating compartment panel 16. Reference numeral 17a is a refrigerating compartment return air passage suction port, and 17b is a refrigerating compartment return air passage outlet. The cold air that has passed through the cooling fan 12 is introduced into the cold room cold air passage 15 through the cold air amount adjusting damper thermostat 14, and the cold room outlets 16a, 16 of the cold room panel 16 are provided.
After being introduced into the refrigerating compartment 1 via b to cool the refrigerating compartment 1, the refrigerating compartment return air duct suction opening 17a circulates the refrigerating compartment return air duct 17b back to the cooler 11. Here, since the air returned from the refrigerating chamber 1 and the freezing chamber 2 contains water, the cooling unit 9b and the cooler 11 are frosted, so that the defrosting heater 10 is energized and cooled periodically. The portion 9b and the cooler 11 are heated to defrost.

The food stored in the refrigerating compartment 1 is usually cooled to 0 to 10 ° C, while the food stored in the freezing compartment 2 is usually frozen to about -18 to -22 ° C. Has been done. Therefore, the temperature of the cooler 11 needs to be set to −22 ° C. or lower. When a cooler is installed in the internal space of the refrigerating compartment 1, it is necessary to insulate the fan grill 13 so that the temperature on the refrigerating compartment 1 side of the fan grill 13 that separates the cooler 11 from the internal space does not drop too much. However, since the cooling unit 9a and the cooler 11 of the Stirling refrigerator 9 are provided in the space of the freezer compartment 2, there is no need to specially insulate the fan grill 13 from heat.

The structure of a free piston type Stirling refrigerator will be described as an example. FIG. 2 is a sectional view showing the structure of a free piston type Stirling refrigerator shown in, for example, Japanese Patent Laid-Open No. 2000-39222, where 9 is a Stirling refrigerator, 9a is a heat radiating portion, 9b is a cooling portion, and 9c is a piston. , 9d is a displacer, 9e is a regenerator, 9f is a piston support spring, 9g is a displacer support spring, 9h is a compression space, and 9i is an expansion space.
Here, the Stirling refrigerator 9 is filled with a non-flammable, non-toxic, and safe gas that has little effect on the global environment, such as helium and nitrogen. In the case of a free-piston type Stirling refrigerator, a dynamic vibration reducer is generally installed and the vibration and noise are low.

As described above, the space on the back side of the freezer compartment 2 is partitioned by the fan grill 13 and the cooler 11 is arranged therein.
By connecting the Stirling refrigerator 9 to the cooler 11,
When a free piston type refrigerator is used as the Stirling refrigerator 9 because it uses a working fluid that is excellent in space saving and is environmentally friendly, a refrigerator with low vibration and noise can be obtained. It is possible to obtain a highly reliable refrigerator because the refrigerator is not used. Further, even when a refrigerator having a mechanical drive unit is used as the Stirling refrigerator, there is no portion having an extremely small cross-sectional area such as a capillary tube or an expansion valve as in the conventional case, and therefore the reliability is similarly high. Further, in any type of Stirling refrigerator 9, since there is no refrigerant pipe, it is possible to obtain a refrigerator excellent in disassembly at the time of discarding the refrigerator.

Although the example in which the Stirling refrigerator 9 is installed horizontally is shown above, the Stirling refrigerator 9 may be installed vertically, and such an embodiment is shown in FIG.
In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 3, the Stirling refrigerator 9 is installed vertically, and the cooler 11 is installed above the cooling unit 9b. Therefore,
The Stirling refrigerator 9, the cooler 11, and the cooling fan 12 are installed in the space on the inner side of the freezer compartment 2 from the lower side in the vertical direction, so that the space is not wasted. In this embodiment, the example of the free piston type Stirling refrigerator shown in FIG. 2 is shown, but the limitation of horizontal and vertical placement does not depend on the type of Stirling refrigerator, and the drive of the Stirling refrigerator is not possible. Depending on the design of the section, it is designed to be placed vertically or horizontally.

In the above, the bottom freezer type refrigerator in which the freezing compartment 2 is located in the lower stage is shown, but an embodiment of a top freezer type refrigerator in which the freezing compartment 2 is located in the upper stage is shown. FIG. 4 is a sectional view of a refrigerator showing such an embodiment.
In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, the upper part of the refrigerator is a freezer compartment 2 and the lower part is a refrigerating compartment 1, 18 is a cooling air passage on the refrigerating compartment side, 19a is a freezing compartment return air passage suction port, and 19b is a freezing compartment return air passage. It is a mouth. Also in this case, as in the above embodiment, the cooler 1 attached to the cooling unit 9b of the Stirling refrigerator 9.
The cold air cooled in 1 is cooled by the cooling fan 12 through the freezing chamber outlet 13a of the fan grill 13 and the freezing chamber 2
The inside of the freezer compartment 2 is cooled by being sent inside. On the other hand, by the cooling fan 12, the cooling air passage 1 in the freezer compartment
After the cool air is sent into the inside of the refrigerating compartment 1 via 8 and the damper thermostat 14 for adjusting the cool air quantity to cool the inside of the refrigerating compartment 1, the refrigerating compartment return air duct blowout via the refrigerating compartment return air duct suction port 17a. Circulation returns from the port 17b to the cooler 11.

In this way, the space on the back side of the freezer compartment 2 is partitioned by the fan grill 13, the cooler 11 is disposed there, and the Stirling refrigerator 9 is connected to the cooler 11, which simplifies the structure and saves space. A refrigerator excellent in space can be obtained.

Furthermore, since the temperatures of the refrigerating compartment 1 and the freezing compartment 2 are different, stirling refrigerators may be installed individually, and such an embodiment is shown in FIG. FIG. 5 is a sectional view showing this embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, a Stirling refrigerator 9 is installed on the freezer compartment 2 side as in the above embodiment. Also, refrigerator room 1
A refrigerating room Stirling refrigerator 20 is installed on the back side of the refrigerator. Reference numeral 20a denotes a heat radiating portion, and 20b denotes a cooling portion. A refrigerating compartment cooler 21 is attached to the cooling portion 20b, and cold air cooled by the refrigerating compartment cooling fan 21 by the refrigerating compartment cooler 21 is cooled by the refrigerating compartment fan grill 23. Is sent to the inside of the refrigerating compartment 1 through a refrigerating compartment fan grill outlet 23a provided in the refrigerating compartment, and after the refrigerating compartment 1 is cooled, it returns to the refrigerating compartment cooler 22 through the refrigerating compartment fan grill suction opening 23b and circulates. .

By arranging the Stirling refrigerator in each of the compartments in which the inside of the refrigerator is partitioned in this way, the cooling air passage structure can be simplified, and independent temperature control can be performed for each of the refrigerating compartment 1 and the freezing compartment 2. It will be possible. Furthermore, since the temperature of the refrigerating compartment 1 is below freezing, it is possible to operate the cooling unit 20b of the refrigerating compartment Stirling refrigerator 20 and the refrigerating compartment cooler 21 at temperatures below freezing, and to perform defrosting. There is no need to install a heater or the like.

Next, operation control of the refrigerator according to this embodiment will be described. Here, the embodiment of FIG. 3 will be described as an example. FIG. 6 is a sectional view showing components of a control system in the embodiment of FIG. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 24 is a refrigerating compartment temperature sensor that detects the temperature of the refrigerating compartment, 25 is a freezing compartment temperature sensor that detects the temperature of the freezing compartment, and 26 is installed in the cooling unit 9b or the cooler 11 of the Stirling refrigerator 9, and A cooling unit temperature sensor for detecting the temperature, 27 is a Stirling refrigerator 9
The radiator 28 installed in the heat radiation part of the machine room fan is installed in the machine room space where the main body of the Stirling refrigerator 9 and the heat radiation part 9a are installed, and is a machine room fan installed to cool the radiator 27. is there. Further, 29 is a base plate on which the main body of the Stirling refrigerator 9 and the machine room fan 27 are placed, 30 is a machine room cover, and the machine is provided with a space surrounded by the main body heat insulating wall 7, the base plate 29, and the machine room cover 30. The chamber is made up.

FIG. 7 shows the machine room of the refrigerator according to the embodiment,
It is a principal part projection view which looked at the machine room cover 30 from the back side in the state, 6 is an outer box, 9 is a Stirling refrigerator,
9j is a leg attached to the main body of the Stirling refrigerator 9, 27 is a radiator, 28 is a machine room fan, 29 is a base plate,
Reference numeral 31 is a heat radiation unit temperature sensor that is attached to the heat radiation unit 9a of the Stirling refrigerator 9 or the heat radiator 27 and detects the temperature thereof.

FIG. 8 is a block diagram of operation control in this embodiment. The outputs of the refrigerator compartment temperature sensor 24 and the freezer compartment temperature sensor 25 determine the temperature inside the refrigerator. For example, when a rapid cooling operation needs to be performed, the output of the Stirling refrigerator 9, the rotation speed of the cooling fan 12, and the cooling air The opening / closing operation of the quantity adjusting damper thermostat 14 is controlled. Here, the Stirling refrigerator 9 is capacity-controlled and output-controlled, for example, by varying the amplitude of its piston in the case of a free piston type refrigerator, or by changing the rotation speed of the drive unit in the case of a mechanical refrigerator. . Further, the operating states of the Stirling refrigerator 9 are grasped by the outputs of the cooling unit temperature sensor 26 and the heat radiating unit temperature sensor 31, and the rotation speed of the cooling fan 12 and the rotation speed of the machine room fan 28 are controlled as necessary, which is optimum. It is possible to control the operating state.

For example, when the freezer compartment temperature sensor 25 detects that the temperature inside the freezer compartment 2 is high, the Stirling refrigerator 9 and the cooling fan 12 are operated and the freezer compartment 2 is cooled. At this time, when the cold room temperature sensor 24 detects that the temperature inside the cold room 1 is also high, the damper thermostat 14 for adjusting the amount of cold air is opened and the cold room 1 is also cooled. When warm food or the like is put in the freezer compartment 2 and the temperature thereof suddenly rises, the temperature change is detected by the freezer compartment temperature sensor 25, the Stirling refrigerator 9 is operated at high capacity, and the cooling fan 12 is also rotated at high speed. Be driven. Further, from the operating state of the Stirling refrigerator 9 detected by the cooling unit temperature sensor 26 and the heat radiating unit temperature sensor 31, the machine room fan 28 is operated at a high rotation speed, so that the temperature of the Stirling refrigerator 9 is increased by a high load. Preventing it, and keeping the temperatures of the heat radiating portion 9a and the cooling portion 9b at an optimum level.

On the other hand, it is desired to cool the temperature of the freezer compartment 2 to a lower deep temperature zone, for example, about -30 ° C, for the purpose of improving the storability of food, rather than the normally controlled level of -18 ° C to -22 ° C. Also in this case, the Stirling refrigerator 9 can be operated at a high capacity and the cooling fan 12 and the machine room fan 28 can be operated at a high speed without using a special device such as an electronic expansion valve, so that the control can be easily performed. Is possible.

With the above configuration, the temperature inside the refrigerator can be maintained at an optimum level, and if necessary, the temperature inside the refrigerator can be cooled to a low temperature such as a deep temperature zone, and the capacity is easy. It is possible to obtain a variable refrigerator.

In the above embodiment, when the cooling fan 12 is operated, cold air is always sent into the freezer compartment 2. Therefore, the cooling fan 12 is operated with the temperature of the cooler 11 higher than the temperature of the freezer compartment 2. Then, the temperature of the freezer compartment 2 will rise. An embodiment for solving this problem is shown in FIG. FIG. 9 is a sectional view showing such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numeral 32 is a damper thermostat for adjusting the amount of cold air in the freezer compartment, which is installed between the cooling fan 11 and the freezer compartment outlet 13a of the fan grill 13.

Further, FIG. 10 shows a typical refrigerator operation pattern of this embodiment. At time t1, the output of the freezer compartment temperature sensor 25 causes the Stirling refrigerator 9 to operate at a high capacity, and the temperatures of the cooling unit 9b and the cooler 11 are sufficiently lowered. The cooling fan 12 is also operated at a high speed to exhibit the required refrigerating capacity. At this time, the damper thermostat 32 for adjusting the amount of cold air in the freezing compartment is in the open mode, and the damper thermostat 14 for adjusting the amount of cold air in the refrigerating compartment 1 is in the closed mode, which is the freezing operation mode.
At time t2, the freezer compartment temperature sensor 25 detects that the temperature of the freezer compartment 2 has dropped sufficiently, the Stirling refrigerator 9 operates at a low capacity, the cooling fan 12 operates at a low speed, and the damper thermostat 32 for adjusting the freezer compartment cool air amount. In the closed mode, the cold air amount adjusting damper thermostat 14 on the refrigerating compartment 1 side is switched to the refrigerating operation mode in the open mode. Since there is little influence on the temperature of the freezer compartment 2 in the refrigerating operation mode, the capacity of the Stirling refrigerator 9 or the like is controlled so that the temperature of the cooler 11 becomes 0 ° C. or higher, so that the cooler can be operated in the refrigerating operation mode. It is possible to perform the operation of cooling the refrigerating compartment 1 while melting the frost adhering to 11 during the refrigerating operation mode. Here, the machine room cooling fan 28 is controlled by the operating state of the Stirling refrigerator 9 and the output of the heat radiation part temperature sensor 31, and for example, the time t1 to t when the Stirling refrigerator 9 is in a high capacity operation.
2 is operated at high speed, and the Stirling refrigerator 9 is operated at low speed during time t2 to t3 during low capacity operation.

With the above configuration, the cooling unit 9
Frost on the b and the cooler 11 is suppressed, and a defrosting device such as a defrosting heater is unnecessary. Further, since the moisture in the cold air sent to the refrigerating compartment 1 circulates without adhering to the cooler 11, there is an effect that the humidity inside the refrigerating compartment 1 is maintained.

In the above embodiment, the freezer compartment 2 is connected to the cooler 11
Although a refrigerator of a type that cools with cold air that has been heat-exchanged with is shown, a method of directly cooling the inside of the refrigerator may be used. FIG. 11 is a sectional view showing an embodiment in this case. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numeral 33 denotes a cooling plate which is also made of a metal such as iron or aluminum and which also serves as an inner box of the freezing chamber 2. The cooling plate 33 is attached to the cooling unit 9b of the Stirling refrigerator 9 and forms a space of the freezing chamber 2. The cooling plate 33 is provided with a suction port 33 a, and the cooling fan 12 is installed in the space on the back side of the cooling plate 33. 34
a is a return air passage suction port from the refrigerator compartment 1 to the freezer compartment 2
Reference numeral 4b is a return air passage outlet.

The cooling plate 33 directly cooled by the cooling unit 9b of the Stirling refrigerator 9 directly cools the inside of the freezer compartment 2. In addition, the cooling fan 12 sends the cool air inside the freezer compartment 2 to the cold compartment cold air passage 15 through the suction port 33a of the cooling plate 33, and the refrigerating compartment outlets 16a and 16b of the refrigerating compartment panel 16 for refrigerating compartment. After cooling the refrigerating chamber 1 by being introduced into the inside 1, the cooling chamber 1 is circulated back to the freezing chamber 2 from the return air passage blowing port 34b through the return air passage suction port 34a. In the present embodiment, since the cooling plate 33 directly contacts the partition walls 8 of the refrigerating compartment 1 and the freezing compartment 2, the temperature of the partition wall 8 becomes low. Therefore, a high-performance heat insulating material such as a vacuum heat insulating material may be used for the partition wall 8.

With the above configuration, it is not necessary to use a cooler or a damper thermostat for adjusting the amount of cold air,
The structure of the refrigerator is simple and space-saving is excellent.
The effect is that a low-cost refrigerator can be obtained.

The connection between the Stirling refrigerator and the main body should be easy to attach and detach in order to simplify the manufacturing method, simplify the service work when the Stirling refrigerator fails, and improve the disassembly / separation property when the refrigerator is discarded. It is better to do it. An embodiment relating to this purpose is shown in FIG. FIG. 12 is a sectional view of an essential part showing a mounting portion of the Stirling refrigerator. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 9 is a Stirling refrigerating machine, 35 is a refrigerating machine heat insulating material such as urethane foam resin or styrofoam, which is separate from the main body heat insulating wall 7. After the Stirling refrigerating machine 9 is attached, screws 36 and the like are fixed. It is attached to the main body heat insulation wall 7 by a member.
FIG. 13 is a projection view of the mounting portion of the Stirling refrigerator 9 of FIG. 12 viewed from the bottom. As described above, the Stirling refrigerator 9 is detachably attached to the main body, which has the effects of simplifying the manufacturing process, improving serviceability, and improving disassembly / separation at the time of discarding the refrigerator. Although the refrigerating machine mounting heat insulating material 35 is made of urethane foam resin or styrofoam in the above embodiment, a vacuum heat insulating panel may be used.

In the above embodiment, the example in which the inside of the refrigerator is divided into two is shown, but the inside of the refrigerator is divided into three or more rooms and the temperature is changed in each room so that the refrigerator is highly functionalized. However, a Stirling refrigerator can be installed in the same manner. An example of the form of the refrigerator will be described with reference to the drawings. Figure 1
4 is a projection view of the refrigerator viewed from the front, and in the figure,
1 is a refrigerating room, 2 is a freezing room, 37 is an ice making room, 38 is a switching room in which temperature zones can be switched, and 39 is a vegetable room. As described above, the refrigerator compartment 1 is, for example, 0 ° C. to 10 ° C., and the freezer compartment 2 is, for example, −1.
8 ° C. to −22 ° C., the ice making chamber 37 is, for example, −18 ° C. to −22.
C., the temperature of the switching chamber 38 is arbitrarily set in a refrigerating temperature zone, a freezing temperature zone, etc., and the temperature of the vegetable chamber 39 is set to 3 to 10.degree.

FIG. 15 is a front view showing a refrigerator of another form. The same members as those in FIG. 14 are designated by the same reference numerals, and detailed description thereof will be omitted. In the form of FIG. 15, the vegetable compartment 39 is arranged in the lower stage of the refrigerator compartment 1. Also,
FIG. 16 is a front projection view showing a refrigerator of another form. The same members as those in FIG. 14 are designated by the same reference numerals, and detailed description thereof will be omitted. Although the vegetable compartment 39 is arranged in the lower stage of the refrigerating compartment 2 also in the form of FIG. 16, the freezing compartment 2 is for the purpose of improving the organization of foods.
It is divided and arranged in b. Further, FIG. 17 is a front projection view showing a refrigerator of another form. The same members as those in FIG. 14 are designated by the same reference numerals, and detailed description thereof will be omitted. In the refrigerator shown in FIG. 17, a refrigerator compartment 1 and a freezer compartment 2 are provided.
A vegetable compartment 39 is arranged between the two.

An embodiment of the present invention will be described by taking the refrigerator of the form shown in FIG. 17 as an example. FIG. 18 is a sectional view showing such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 40 is a vegetable compartment door, 41 is a partition wall that separates the refrigerator compartment 1 and the vegetable compartment 39, 42 is a partition wall that separates the vegetable compartment 39 and the freezer compartment 2, and 43a is a refrigerator compartment 1 to the vegetable compartment 3
9 is a vegetable compartment air passage inlet, 43b is a vegetable compartment air passage outlet, 44a is a vegetable compartment return air passage inlet from the vegetable compartment 39 to the cooler 11, and 44b is a vegetable compartment return air passage outlet. is there.

The cooling section 9b of the Stirling refrigerator 9 is installed in the space partitioned by the fan grill 13 on the inner side of the freezer compartment 2. The cold air blown into the refrigerating compartment 1 rises in temperature to the refrigerating compartment by cooling the refrigerating compartment 1, is sucked in through the vegetable compartment air duct inlet 43a, and then passes through the vegetable compartment air duct outlet 43b. Entering the inside of the chamber 39, the vegetable chamber 39 is cooled. The air inside the vegetable compartment 39 is sucked in from the vegetable compartment return air passage inlet 44a, and returns to the cooler 11 through the vegetable compartment return air passage outlet 44b to circulate.

With the above configuration, the refrigerator has 3
By cooling with a Stirling refrigerator even in a form of partitioning into three or more compartments, it is possible to obtain a refrigerator that has little effect on the global environment, is excellent in safety, and is excellent in space saving.

When the Stirling refrigerator is used, unlike the conventional vapor compression refrigeration cycle, since the refrigerant pipe is not required, the cabinet pipe 60b of the condenser 60 which also serves as the dew-proof pipe of the refrigerator is not provided. Here, the structure for preventing dew condensation of the refrigerator according to the present invention will be described. FIG. 19 is a perspective view showing a state where the door of the refrigerator is removed according to the embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, reference numeral 45 denotes a dew-proof heater installed in the opening of the refrigerator to prevent the opening of the refrigerator from being exposed to dew. With this configuration, even when the Stirling refrigerator is used, dew does not adhere to the opening of the refrigerator.

Next, the defrosting structure of the cooler 11 in this embodiment will be described. FIG. 20 is a sectional view showing such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure, 46 is installed below the cooler 11,
This is an umbrella for protecting the defrosting water dropped by defrosting the surface of the cooler 11 or the defrosting heater 10. Reference numeral 47 indicates an upward flow generated during defrosting.

The cooling unit 9b of the Stirling refrigerator 9 and the cooler 11 attached to the cooling unit 9b are cooled to a low temperature by the drive of the Stirling refrigerator 9, so the cooler 11
Moisture contained in the air flow passing through the water is frozen and frost is easily generated on the surface. When frost forms on the cooling unit 9b and the cooler 11, the contact area with the air flow blown by the cooling fan 12 is significantly reduced. Therefore, there is a possibility that the air flow cannot be efficiently cooled. Therefore, the defrosting heater 10 is installed below the cooling unit 9b and the cooler 11, and an umbrella 46 is provided to protect the surface of the cooler 11 from defrosting water dropped by defrosting. A quartz glass tube heater is usually used as the defrosting heater 10, but a sheathed heater or a ceramic heater may be used. When the defrosting heater 10 is energized,
The generated thermal energy warms the air around the defrosting heater 10 and rises as a heat flow 47. Heat flow 47 is cooler 1
1, the heat energy of the defrosting heater 10 is efficiently transmitted to the cooler 11 and melts the frost generated on the surface of the cooler 11.

In the above, the embodiment in which the defrosting heater 10 is arranged below the cooling unit 11 or the cooling unit 9b of the Stirling refrigerator 9 has been described.
Alternatively, a method of directly attaching to the cooling unit 9b and heating may be used.
21 and 22 are sectional views showing an embodiment in this case. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. Figure 2
Reference numeral 48 is a defrosting heater directly attached to the cooler 11 or the cooling unit 9b of the Stirling refrigerator 9. As the defrosting heater 48, a crimp type pipe heater is usually used, but a mica heater or a sheath heater may be used. Further, as shown in FIG. 22, a mica heater or a ceramic heater may be used as the flat heater 49. When the defrosting heater 48 is energized, the generated thermal energy is directly transferred to the cooler 11 or the cooling unit 9b of the Stirling refrigerator 9.
Therefore, the heat transfer efficiency is excellent, the frost generated on the surface of the cooler 11 can be surely melted, the time required for defrosting can be shortened, and energy saving can be realized.

Now, the refrigerator 11 of the refrigerator according to the present invention will be described. FIG. 23 shows a cooler 11 showing such an embodiment.
FIG. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In order to improve the transfer efficiency of the cold heat accumulated in the cooler 11 cooled by the drive of the Stirling refrigerator 9, it is required to increase the surface area of the heat exchange portion which is in contact with the air flow. Therefore, as shown in FIG. 23, a plurality of fins 50 are arranged in parallel and a plurality of pipes 51 are arranged vertically to the fins 50. When the space formed by the plurality of fins 50 is arranged so as to be vertical, and the Stirling refrigerator 9 in which one end of the pipe 51 is joined to the cooling unit 9b of the Stirling refrigerator 9 with heat conductive grease or the like is driven, The airflow generated by the airflow of the cooling fan 12 passes between the fins 50 of the cooler 11 and is efficiently heat-exchanged and cooled. The fins 50 and the pipes 51 of the cooler 11 may be made of a heat conductive material such as aluminum or copper.

In order to improve the transfer efficiency of cold heat to the air flow, it is effective to increase the surface area of the heat exchange portion which is in contact with the air flow as described above. If the distance between the fins 50 is narrowed, the transmission efficiency is improved. However, since the air flow circulating in the refrigerator contains a large amount of water, when passing through the cooled cooler 11, the water in the air flow is frozen on the surfaces of the fins 50 and the pipes 51, Frost is likely to occur. As described above, when frost is formed on the cooler 11, the contact area with the air flow is significantly reduced, and efficient cooling cannot be achieved.
If 2 is packed too much, there is a problem that the thermal efficiency of the cooler 11 is likely to be deteriorated, and the fins through which the air flow passes are clogged with frost, resulting in poor cooling. Therefore, by setting the fin pitch 52 of such a cooler to 3 to 7 mm, the heat transfer efficiency (cooling performance) is good, and the deterioration of the cooling performance due to frost formation is unlikely to occur, and stable and highly efficient cooling performance can be obtained. Therefore, the power consumption of the refrigerator can be suppressed. In the above description, the cooler 11 including the fins 50 and the pipes 51 is described as an example.
The same applies to the cooler 11 shown in FIG. 24 and FIG. 25, which is exemplified by −33140, and the fin pitch 52 of the partition and the partition forming the space through which the air flow passes through the cooler is 3 to 3.
If it is set to 7 mm, it is possible to obtain a refrigerator that saves energy and does not cause cooling failure.

Next, a method of evaporating defrost water for a refrigerator according to the present invention will be described. FIG. 26 is a sectional view showing such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.
In the figure, 53 is a cooler 11 and a defrosting heater 10.
Is a dew pan that is placed under the defroster and receives dripping defrosting water generated by defrosting the cooler 11 and the cooling unit 9b. The defrosting water collected in the dew tray 53 is the dew tray 53.
Drain hose 5
5 and is guided to the evaporation dish 56. Evaporating dish 56 here
The radiator 27 installed in the radiator 9a of the Stirling refrigerator 9 is disposed therein, and the defrosting water collected in the evaporation tray 56 soaks the radiator 27, and the heat of the radiator 27 causes Since it efficiently evaporates and a separate heating element for promoting evaporation is not installed, low cost and energy saving can be realized. Further, when the defrost water evaporates, the heat of vaporization is taken from the heat radiation portion 9a of the Stirling refrigerator 9 to cool it. This further promotes heat dissipation in the heat dissipation unit 9a, so that the refrigeration performance of the Stirling refrigerator 9 is improved, a large amount of cold heat can be taken out from the cooling unit 9b, and further energy saving can be achieved. Further, by using the defrosting method in which the defrosting heater 10 is attached to the cooler 11 or the cooling unit 9b and directly heated as described above, the radiator 27 thus installed in the heat radiating unit 9a is used as an evaporation dish. It may be arranged in 56 to be soaked in water and evaporated.

In the above, the radiator 27 installed in the heat radiating portion 9a of the Stirling refrigerator 9 is arranged in the evaporation tray 56, and the defrost water collected in the evaporation tray 56 is submerged to evaporate the defrost water. Although the embodiment has been described, a method of directly heating the evaporation dish 56 with the heat of the heat radiating portion 9a of the Stirling refrigerator 9 will be described. FIG. 27 is a sectional view showing such an embodiment. still,
In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In the figure,
5 arranged below the cooler 11 and the defrosting heater 10.
Reference numeral 3 denotes a dew tray that receives defrosting water generated by defrosting the cooler 11 and the cooling unit 9b. The defrosting water collected in the dew tray 53 is drainage port 54 of the dew tray 53.
Is discharged to the outside of the storage from time to time, flows through the drain hose 55, and is guided to the evaporation tray 56. Here, the evaporation tray 56 is installed in the vicinity of the heat radiation portion 9a of the Stirling refrigerator 9, and the defrost water collected in the evaporation tray 56 is evaporated by the heat of the heat radiation portion 9a.
Since there is no special heating element to promote evaporation,
Low cost and energy saving can be realized. In this case, as the material of the evaporation dish 56, a thermoplastic resin that does not normally corrode is often used, but a metal such as aluminum or stainless steel may be used in consideration of heat resistance and corrosion resistance. Further, when the metal evaporation tray 56 is used, it can be installed directly on the heat dissipation portion 9a of the Stirling refrigerator 9, and the heat of the heat dissipation portion 9a can be more efficiently transferred to the evaporation tray 56 and the evaporation tray 56.
Since it can be transmitted to the defrosted water collected in, the evaporation is promoted and the heat dissipation in the heat dissipation unit 9a is further promoted, so that the freezing performance of the Stirling refrigerator 9 is improved. In FIG. 27, the evaporating dish 56 is directly attached to the heat radiating portion 9a, but the radiator 27 installed in the heat radiating portion 9a as shown in FIG.
Even if it is attached to, the same effect can be obtained.
Further, by using the one in which the radiator 27 and the evaporation tray 56 are integrated, performance improvement and low cost can be realized.

Next, the defrosting control of the refrigerator according to the present invention will be described. FIG. 29 is a cross-sectional view showing such an embodiment, and FIGS. 30 and 31 are block diagrams of defrosting control in such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 29, 26 is a cooling part temperature sensor installed in the cooling part 9b of the Stirling refrigerator 9, 31 is a heat dissipation part temperature sensor installed in the heat dissipation part 9a of the Stirling refrigerator 9, and 57 is attached outside the refrigerator. It is an outside temperature sensor. The cooling unit temperature sensor 26 constantly monitors the temperatures of the cooling unit 9b and the cooler 11 of the Stirling refrigerator 9, and the frosted state of the cooler 11 is grasped based on the output of the cooling unit temperature sensor 26. Generally, when the amount of frost formed on the heat exchange unit such as the cooler 11 and the cooling unit 9b increases, the heat exchange is impaired, and the temperatures of the cooler 11 and the cooling unit 9b are supercooled. Therefore, when the temperature of the cooling part temperature sensor 26 falls below a certain set temperature, it is determined that frost has occurred, and the defrosting heater 10 is energized. As a result, it is possible to prevent the frost formed on the surface of the cooler 11 from becoming excessively large to the extent that the cooling performance is deteriorated, and the frost that has already been generated is melted. When the temperature of the cooling unit 9b detected by the cooling unit temperature sensor 26 rises above a predetermined value, the control device cuts off the power supply to the defrosting heater 10.

In the above description, the frosting condition is grasped only by the cooling part temperature sensor 26 installed in the cooling part 9b of the Stirling refrigerator 9, but the outside air temperature sensor 57 is installed,
By setting the set temperature of the cooling unit temperature sensor 26 that determines that there is frost in accordance with the outside air temperature, that is, by controlling the output of the outside air temperature sensor 57 and the output of the cooling unit temperature sensor 26 in combination, More detailed defrost control can be performed. In this case, the heat radiation part temperature sensor 31 of the heat radiation part 9a of the Stirling refrigerator 9 may be used instead of the outside air temperature. Further, in the case of a refrigerator in which the output of the Stirling refrigerator 9 and the rotation speed of the cooling fan 12 can be variably controlled, the defrosting control can be optimally performed by combining these operating states and grasping the frosting state.

Further, an effective method for grasping the frosted state will be described. 32 is a cross-sectional view showing such an embodiment, and FIG. 33 is a block diagram of defrosting control in such an embodiment. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 32, reference numeral 58 is a refrigerating room blowing temperature sensor. When frost is generated and grows on the cooler 11, heat exchange with the air flow blown by the cooling fan 12 is not efficiently performed, so that the temperature of the cool air passing through the cooler 11 is the frost-free cooler 11 The temperature does not become low compared to the temperature of cold air that has passed through. Therefore, the frosted state can be determined more accurately based on the temperature difference between the cooling unit temperature sensor 26 and the refrigerating room blowout temperature sensor 58. Accurately grasping the frosted state in this manner prevents the defrosting heater 10 from being energized in a state with little frosting, and does not interfere with the transfer efficiency of the cold heat accumulated in the cooler 11 to the air. Since frost can be prevented, optimum defrost control can be performed and energy saving can be realized. Cooler 11
Although the refrigerating chamber outlet temperature sensor 58 is mentioned as the temperature sensor on the downstream side of the above, the temperature sensor may be installed at any place as long as it is a cool air passage on the downstream side of the cooler. Also in the above defrosting control method, in the refrigerator in which the cooling fan 12 is capable of variably controlling the rotation speed, when the air volume of the air flow passing through the cooler changes, the temperature difference between the upstream side and the downstream side of the cooler 11 changes. Therefore, if the number of rotations of the cooling fan 12 is added to the frosting state determination element, more optimal defrosting control can be performed.

Further, FIG. 34 shows a typical refrigeration of this embodiment.
The defrosting control pattern of a warehouse is shown. Time t on the horizontal axis of the figure₀Sometimes
The output of the freezer temperature sensor 25,
Of the cooling unit 9b and the cooler 11
The temperature drops. The temperatures in the freezer compartment 2 and the refrigerator compartment 1 have dropped sufficiently.
That is, the freezer temperature sensor 25 and the refrigerator temperature sensor
The Stirling refrigerator 9 detects t₁Sometimes stop
Stop. At this time, the cooler 11 is included in the passing air flow.
As the water content freezes and gradually frosts,
The discharge temperature rises and the temperature of the cooling section of the Stirling refrigerator 9 is increased.
Descends. That is, the difference between the outlet temperature of the refrigerating room and the temperature of the cooling section
Expands. However, frost that deteriorates the cooling performance
Since it was judged that there was still a margin by the amount, the defrost heat
The data 10 is not energized. The temperature of the freezer compartment 2 has risen
Is detected by the freezer compartment sensor 25_TwoUntil time, Stari
Cooling refrigerator 9 is stopped. Frost of the cooler 11 during the stop
Refrigerator cooling part temperature, cold room temperature sensor 24
Temperature rises. In this way Stirling refrigerator
9 starts and stops repeatedly at time t_ThreeRefrigerated at times
There is a difference between the room outlet temperature and the cooling part temperature.
Then, the defrosting heater 10 is energized. Then general
The Stirling refrigerator 9 stops and the cooling unit temperature sensor
-26 until it reaches the set temperature that determines that defrosting is complete.
Absent. Time t _FourWhen the cooling unit temperature sensor 26
When it is determined that the defrosting is completed, the defrosting heater 10 is turned off.
Then, the Stirling refrigerator 9 is operated. Like this
Accurately grasps the frosting condition and obtains stable cooling performance.
Controlled to

Next, a method of treating the defrosted water that has been evaporated and vaporized in the evaporation tray 56 will be described. FIG. 35 is a cross-sectional view showing such an embodiment, and FIG. 36 is a main part projection view of the machine room of the refrigerator as viewed from the back side. In this embodiment, the same members as those in the above embodiment are designated by the same reference numerals, and detailed description thereof will be omitted. In FIG. 35, reference numeral 28 denotes a machine room fan installed in the machine room space in which the main body of the Stirling refrigerator 9 and the heat radiating section 9a are installed to cool the radiator 27 and the heat radiating section 9a. In FIG. 36, 9j is a leg attached to the body of the Stirling refrigerator 9,
Is a base plate on which the Stirling refrigerator 9 and the machine room cooling fan 28 are mounted, 30 is a machine room cover for covering the machine room, 30a is provided on the machine room cover 30, and is provided on the upstream side of the machine room cooling fan 28. The suction port 30b is an outlet provided in the machine room cover 30 and provided on the downstream side of the machine room cooling fan 28. The defrosted water collected in the evaporation tray 56 by the defrosting operation is warmed by the heat of the heat radiating unit 9a and the radiator 27, and is evaporated and vaporized. Machine room fan 2 controlled to operate the vaporized water vapor during and after defrosting
By the air flow created by 8, the air is discharged from the outlet 30b of the machine room cover 30 and diffused into the outside air having low humidity. As a result, once evaporated water vapor does not condense on parts of the machine room that have a relatively low temperature, the problem of water dripping can be prevented, and corrosion of parts can also be prevented, making it safe and reliable. We can provide highly productive products. Further, due to the air flow from the machine room fan 28, the convective heat transfer between the surface of the defrost water in the evaporation tray 56 and the air is improved and the evaporation speed is also increased, so that the risk of defrost water overflowing from the evaporation tray 56 is eliminated. . Further, since the volume of the evaporation tray 56 can be small, space can be saved. Here, the Stirling refrigerator 9 is provided on the downstream side of the machine room fan 28.
Although the refrigerator cooling unit 9a is installed, the same effect can be obtained even with the configuration installed on the upstream side because an air flow is generated in the machine chamber.

[0058]

As described above, according to the present invention, by using a Stirling refrigerator using helium or nitrogen as a working fluid, there is little influence on the global environment,
In addition, it is possible to obtain a refrigerator that is free from the risk of ignition and explosion like flammable refrigerants. Further, by arranging the cooling unit of the Stirling refrigerator near the cooler, the structure of the refrigerator can be simplified, and a refrigerator with excellent space saving and reduced manufacturing cost can be obtained.

Further, in a refrigerator in which the interior of the refrigerator is divided into a plurality of rooms, the freezer compartment space is partitioned, and the cooling unit of the Stirling refrigerator is installed in this partitioned space, which simplifies the structure of the refrigerator. It is possible to obtain a refrigerator that effectively utilizes the internal volume.

Further, it has an inside temperature detecting means, and is provided with a temperature detecting means for the cooling part and the heat radiating part of the Stirling refrigerator.
By controlling the operation of the Stirling refrigerator by the output of the in-compartment temperature detecting means, it is possible to obtain a refrigerator capable of optimally controlling the in-compartment temperature.

By operating the Stirling refrigerator with variable capacity by capacity control, it is possible to obtain a refrigerator corresponding to a wide range of set temperatures.

By attaching the Stirling refrigerator to the refrigerator body in a detachable manner, it is possible to obtain a refrigerator having improved workability at the time of repair and improved disassembly / separation at the time of disposal.

Further, in the refrigerator provided with the Stirling refrigerator and the cooler, by providing the cooling section of the Stirling refrigerator and the defrosting means of the cooler, it is possible to obtain a refrigerator having a highly reliable cooling performance. .

Further, since the means for evaporating the defrost water is provided, a highly reliable refrigerator can be obtained without flooding the outside of the refrigerator with the evaporative water.

[Brief description of drawings]

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

FIG. 2 is an internal structural diagram of a Stirling refrigerator according to Embodiment 1 of the present invention.

FIG. 3 is a sectional view showing an example in which a Stirling refrigerator is vertically installed according to the first embodiment of the present invention.

FIG. 4 is a sectional view showing an example of a top freezer type according to the first embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an example in which the Stirling refrigerator according to the first embodiment of the present invention is arranged in each of a refrigerator compartment and a freezer compartment.

FIG. 6 is a sectional view showing a control component according to the first embodiment of the present invention.

FIG. 7 is a main part projection view of the rear surface of the refrigerator according to the first embodiment of the present invention.

FIG. 8 is a control block diagram of the refrigerator according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view showing an example in which a damper air for adjusting the amount of cold air is arranged in a freezer compartment according to Embodiment 1 of the present invention.

FIG. 10 is an operation control pattern diagram according to the first embodiment of the present invention.

FIG. 11 is a cross-sectional view showing an example of a type in which a freezer compartment is directly cooled according to the first embodiment of the present invention.

FIG. 12 is a main-portion cross-sectional view showing a mounting portion of a Stirling refrigerator according to the first embodiment of the present invention.

FIG. 13 is a main part projection view of the bottom part of the refrigerator showing the mounting part of the Stirling refrigerator according to the first embodiment of the present invention.

FIG. 14 is a projection view showing a form of a refrigerator according to the first embodiment of the present invention.

FIG. 15 is a projection view showing a form of a refrigerator according to the first embodiment of the present invention.

FIG. 16 is a projection view showing a form of a refrigerator according to the first embodiment of the present invention.

FIG. 17 is a projection view showing a form of a refrigerator according to the first embodiment of the present invention.

FIG. 18 shows three compartments according to the first embodiment of the present invention.
It is sectional drawing which shows the Example in the refrigerator divided into two rooms.

FIG. 19 is a perspective view showing an arrangement of dew-proof heaters according to the first embodiment of the present invention.

FIG. 20 is a sectional view showing a configuration of a defrosting method for a cooler according to the first embodiment of the present invention.

FIG. 21 is a sectional view showing a configuration of a defrosting method for a cooler according to the first embodiment of the present invention.

FIG. 22 is a sectional view showing a configuration of a defrosting method for a cooler according to the first embodiment of the present invention.

FIG. 23 is a perspective view showing a configuration of a cooler according to the first embodiment of the present invention.

FIG. 24 is a cross-sectional view showing the structure of the cooler according to the first embodiment of the present invention.

FIG. 25 is a sectional view showing the structure of the cooler according to the first embodiment of the present invention.

FIG. 26 is a cross-sectional view showing the configuration of the defrosting water evaporation mechanism according to the first embodiment of the present invention.

FIG. 27 is a cross-sectional view showing the configuration of the defrosting water evaporation mechanism according to the first embodiment of the present invention.

FIG. 28 is a cross-sectional view showing the configuration of the defrosting water evaporation mechanism according to the first embodiment of the present invention.

FIG. 29 is a sectional view showing a defrosting control configuration according to the first embodiment of the present invention.

FIG. 30 is a block diagram showing a defrost control method according to the first embodiment of the present invention.

FIG. 31 is a block diagram showing a defrost control method according to the first embodiment of the present invention.

FIG. 32 is a sectional view showing a defrost control configuration according to the first embodiment of the present invention.

FIG. 33 is a block diagram showing a defrost control method according to the first embodiment of the present invention.

FIG. 34 is a defrosting control pattern diagram according to the first embodiment of the present invention.

FIG. 35 is a sectional view showing a control configuration of defrost water treatment according to the first embodiment of the present invention.

FIG. 36 is a main part projection view showing the control configuration of the defrost water treatment according to the first embodiment of the present invention.

FIG. 37 is a cross-sectional view showing a conventional refrigerator.

FIG. 38 is a refrigerant circuit configuration diagram of a conventional refrigerator.

FIG. 39 is a perspective view showing a structure of a conventional refrigerator condenser.

[Explanation of symbols]

1 refrigerating room, 2 freezing room, 2a freezing room upper stage, 2b freezing room lower stage, 3 refrigerating room door, 4 freezing room door, 5 inner box, 6
Outer box, 7 main body heat insulation wall, 8 partition wall, 9 Stirling refrigerator, 9a heat dissipation part, 9b cooling part, 9c piston, 9d displacer, 9e regenerator, 9f piston support spring, 9g displacer support spring, 9h
Compression space, 9i expansion space, 9j leg part, 10 defrosting heater, 11 cooler, 12 cooling fan, 13 fan grill, 13a freezer outlet, 13b freezer inlet, 14 damper air temperature adjusting damper, 15 Refrigerator cold air duct, 16 Refrigerator panel, 16a Refrigerator outlet, 16b Refrigerator inlet, 17a Refrigerator return air inlet, 17b Refrigerator return air outlet, 18
Refrigerating room side cooling air passage, 19a Freezing room return air passage suction port, 19b Freezing room return air passage outlet, 20
Refrigerator Stirling refrigerator, 20a Heat dissipation part, 20b
Refrigerator, 21 Refrigerator cooler, 22 Refrigerator cooling fan, 23 Refrigerator fan grill, 23a Refrigerator fan grill outlet, 23b Refrigerator fan grill inlet, 24 Refrigerator temperature sensor, 25 Freezer compartment temperature sensor, 26 Cooling part temperature sensor, 27 radiator, 2
8 machine room fan, 29 base plate, 30 machine room cover,
30a Suction port, 30b Blowout port, 31 Radiator temperature sensor, 32 Freezer compartment cool air amount adjustment damper thermostat, 33 Cooling plate, 33a Suction port, 34a Return airway suction port, 34b Return airway blowout port, 35
Refrigerator mounting heat insulator, 36 fixing member, 37 ice making room, 38 switching room, 39 vegetable room, 40 vegetable room door, 4
1 partition wall, 42 partition wall, 43a vegetable room air passage suction port, 43b vegetable room air passage outlet, 44a vegetable room return air passage inlet, 44b vegetable room return air passage outlet, 45 dew-proof heater, 46 umbrella, 47 Heat flow, 4
8 Defrosting heater, 49 heater, 50 fins, 51
Pipe, 52 fin pitch, 53 dew pan, 54
Drainage port, 55 drain hose, 56 evaporation tray, 57
Outside air temperature sensor, 58 Refrigerating room blowout temperature sensor, 59 Compressor, 60 Condenser, 60a Condenser pipe, 60b Cabinet pipe, 61 Expander

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshige Konishi             2-3 2-3 Marunouchi, Chiyoda-ku, Tokyo             Inside Ryo Electric Co., Ltd. F term (reference) 3L045 AA01 AA07 BA01 CA02 DA02                       EA01 PA01 PA02 PA04 PA05                 3L046 AA01 AA04 BA09 CA06 MA01                       MA04 MA05                 3L048 AA01 BA01 BB07 BC02 CA06                       CB03 DA03 DB04 GA01 GA02                       GA03

Claims (7)

[Claims] 1. A refrigerator characterized in that it has a cooler in the interior space and a cooling unit of a Stirling refrigerator is installed near the cooler. 2. A refrigerator having a compartment divided into a plurality of rooms, wherein a freezer compartment space is partitioned, and a cooling unit of a Stirling refrigerator is arranged in the partitioned space. 3. An internal temperature detecting means, a cooling part of a Stirling refrigerator and a temperature detecting means of a heat radiating part, wherein the operation of the Stirling refrigerator is controlled by the output of the internal temperature detecting means. A refrigerator characterized by. 4. A refrigerator characterized in that a Stirling refrigerator is operated with variable capacity by capacity control. 5. A refrigerator in which a Stirling refrigerator is detachably attached to a refrigerator body. 6. A refrigerator comprising a Stirling refrigerator and a cooler, comprising a cooling unit of the Stirling refrigerator and a defrosting means for the cooler. 7. The refrigerator according to claim 6, further comprising means for evaporating defrost water.