JPH11132580A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the freshness retaining performance of food while saving energy. SOLUTION: The refrigerator comprises an oscillatory compressor 7 having a resonance spring coupled with the shaft of a linear motor, and a control means 13 for increasing the refrigerating capacity by increasing the stroke when the evaporation temperature and the condensation temperature increase and decreasing the refrigerating capacity by decreasing the stroke when the evaporation temperature and the condensation temperature decrease by operating the oscillatory compressor 7 while keeping the top dead center clearance of a piston at a first predetermined value regardless of the pressure conditions of cooling system. According to the arrangement, deficiency of cooling is eliminated by increasing the refrigerating capacity naturally and power consumption can be reduced under light load by decreasing the refrigerating capacity naturally, thereby reducing the input power.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the operation control of a refrigerator and a refrigerator, and aims at reducing power consumption and improving the freshness of food.

[0002]

2. Description of the Related Art FIG. 7 shows an example of a conventional refrigerator-freezer.
FIG. 1 is a schematic diagram of a refrigerator-freezer disclosed in Japanese Utility Model Laid-Open No. 7-159014.

[0003] 101 is a refrigerator main body, 102 is a freezer compartment, 1
03 is a refrigerator compartment, 104 is a freezer compartment temperature detector, 105 is a refrigerator compartment temperature detector, 106 is a refrigerator compartment damper, 107 is a compressor, 108 is an evaporator, 109 is a defrost heater, 110
Is a fan.

The operation of this conventional refrigerator will be described. During normal operation, the freezer compartment temperature detector 104 installed in the freezer compartment 102 detects the compressor 1 when the detected temperature is equal to or higher than the set temperature.
07 and the fan 110 are operated. The returned cool air from the freezing room 102 and the cold room 103 passes through the evaporator 108, and the cool air is further cooled.

[0005] The cooled cold air is blown to the freezing room 102 by the fan 110 to cool the freezing room 102 to a predetermined temperature. Further, when the temperature detected by the refrigerator compartment temperature detector 105 installed in the refrigerator compartment 103 is equal to or higher than the set temperature, the refrigerator compartment damper 106 is opened, and the cool air is blown to the refrigerator compartment 103 through the refrigerator compartment damper 106 and the refrigerator compartment 103 is cooled. Cooling. When the refrigerator compartment 103 is below the set temperature, the refrigerator compartment damper 1
06 is closed, and the cool air is not blown to the refrigerator compartment 103.

[0006] The frost on the evaporator 108 during the operation of the compressor 107 energizes the defrost heater 109 at predetermined time intervals to heat the evaporator 108 and perform defrosting.

[0007]

However, in the above-described conventional configuration, it is necessary to periodically remove the frost from the evaporator 108, so that the defrost heater 109 is energized and heated to remove the heated air. The frost is melted by staying in the evaporator 108. However, part of the heat generated at this time is
, The temperature of the food in the freezing room 102 rises temporarily, and if this is repeated, the freshness of the frozen food decreases.

Further, since the evaporator temperature and the freezing room temperature are increased after the defrosting, the compressor operation time for cooling the freezing room temperature to the predetermined temperature after the defrosting is completed becomes longer, and the power consumption is reduced. There was a problem of increasing.

The present invention has been made to solve the above-mentioned conventional problems. By preventing heat during defrosting from entering the freezing compartment, the temperature of food in the freezing compartment rises temporarily and freshness is reduced. An object of the present invention is to provide a refrigerator that does not have any problem.

[0010] Further, by suppressing the temperature rise of the evaporator and the freezing room during defrosting, the compressor operation time for cooling the freezing room temperature to a predetermined temperature after the defrosting is completed is shortened, and the power consumption is reduced. It is an object to provide a refrigerator.

[0011]

In order to achieve the above object, a refrigerator according to the present invention comprises a vibration type compressor comprising a linear motor, a resonance spring connected to a shaft of the linear motor, a condenser, Operating the vibration type compressor in a state in which the top dead center position of the piston is maintained at a first predetermined value regardless of the pressure condition of the cooling system, and a cooling system in which a pressure reducer and an evaporator are sequentially joined. Control means for increasing the stroke to increase the refrigerating capacity when the evaporating temperature and the condensing temperature rise, and decreasing the refrigerating capacity by decreasing the stroke when the evaporating temperature and the condensing temperature fall. doing.

[0012] Thereby, at light load, the refrigerating capacity can be naturally reduced, the input can be reduced, and the power consumption can be reduced.

Further, during the defrosting, by operating the vibrating compressor with the top dead center position of the piston kept at a second predetermined value larger than the first predetermined value, the evaporation temperature is reduced to zero.
Control means for defrosting the evaporator at a temperature of not less than ° C.

Thus, the temperature of the food in the freezer compartment does not rise temporarily, and the freshness holding time is not shortened by increasing the refrigerant temperature without using the heat of the heater at the time of defrosting. In addition, the temperature rise of the evaporator and the freezing room is eliminated, and the time for cooling the freezing room temperature to the predetermined temperature after the completion of the defrosting is greatly shortened, so that the power consumption can be significantly reduced.

Further, during the defrosting, there is provided control means for changing the value of the second predetermined value in accordance with the outside air temperature to raise the temperature of the evaporator to 0 ° C. or more to perform defrosting of the evaporator. ing.

Thus, defrosting can be performed more effectively.

[0017]

DETAILED DESCRIPTION OF THE INVENTION According to the first aspect of the present invention, there is provided a cylindrical cylinder provided with a suction valve and a discharge valve;
A vibration type comprising a piston arranged in the cylinder, a linear motion machine such as a linear motor that connects a shaft to the piston and reciprocates the piston in the axial direction, and a resonance spring connected to the shaft of the linear motor. A compressor, a condenser, a decompressor, and a cooling system in which an evaporator is sequentially connected, and the top dead center position of the piston is maintained at a first predetermined value regardless of the pressure condition of the cooling system. When the evaporating temperature and the condensing temperature rise by operating the vibrating compressor, the refrigerating capacity is increased by increasing the stroke, and when the evaporating temperature and the condensing temperature decrease, the refrigerating capacity is reduced by decreasing the stroke. Control means for lowering the refrigeration capacity, and has the effect of reducing the refrigeration capacity naturally at light load, reducing input and reducing power consumption. .

According to a second aspect of the present invention, during the defrosting of the evaporator, the vibration type compressor is operated with the top dead center position of the piston kept at a second predetermined value larger than the first predetermined value. The defrosting of the evaporator is performed by setting the evaporation temperature to 0 ° C. or more, and the top dead center position of the piston is set to the second predetermined value when the detected temperature of the evaporator temperature detector becomes equal to or higher than the defrost end set temperature. Control means for returning the temperature from the value to the first predetermined value, wherein the temperature of the food in the freezer compartment rises temporarily by increasing the refrigerant temperature without using the heat of the heater at the time of defrosting to perform defrosting. As a result, the freshness holding period is not shortened. At the same time, eliminate the rise in the temperature of the evaporator and the freezing room, and after the defrost is completed, extremely shorten the time for cooling the freezing room temperature to a predetermined temperature,
This has the effect that power consumption can be significantly reduced.

According to a third aspect of the present invention, during the defrosting of the evaporator, the vibration type compressor is operated with the top dead center position of the piston kept at a second predetermined value larger than the first predetermined value. At the same time, the value of the second predetermined value is not changed in accordance with the outside air temperature, the evaporating temperature is set to 0 ° C. or more, and the evaporator is defrosted. Control means for returning the top dead center position of the piston from a second predetermined value to a first predetermined value when the above is achieved,
It has the effect that more effective defrosting can be performed.

(Embodiment 1) Hereinafter, a first embodiment of a refrigerator according to the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of a refrigerator according to a first embodiment of the present invention, FIG. 2 is a sectional view of a vibrating compressor of the embodiment, and FIG.
Is an electric circuit diagram of the embodiment, and FIG. 4 is an operation flowchart of the embodiment.

In FIG. 1, 1 is a refrigerator main body, 2 is a freezer compartment, 3 is a refrigerator compartment, 4 is a freezer compartment temperature detector, 5 is a refrigerator compartment temperature detector, 6 is a refrigerator compartment damper, 7 is a compressor, 8 Is an evaporator and 9 is a fan. 10 is a cooling duct, which is an evaporator 8
Is connected to the freezer compartment 2 and the refrigerator compartment 3. The freezer compartment damper 12 is provided for the cooling duct 10 to the freezer compartment 2, and the refrigerator compartment damper is provided for the cooling duct 10 to the refrigerator compartment 3. 6 are provided. The control means 13 includes the vibration type compressor 7,
The fan 9 and the refrigerator compartment damper 6 are controlled.

The cooling system is constructed by sequentially joining the vibrating compressor 7, the condenser 14, the decompressor 15, and the evaporator 8.

In FIG. 2, a cylindrical cylinder 16 is provided at the center of the vibrating compressor 7, and a yoke 17 and a permanent magnet 18 are annularly disposed around the cylinder 16. An annular coil 19 is provided between the yoke 17 and the permanent magnet 18 and acts on the permanent magnet 18 to move in the axial direction of the cylinder 16.

A compression piston 20 is housed in the cylinder 16 and forms a compression chamber 23 having a suction valve 21 and a discharge valve 22 and is connected to the coil 19 to move in the cylinder 16 in the axial direction. . 24 is a resonance spring, 2
Reference numeral 5 denotes a displacement detector including a differential transformer and the like connected in the axial direction of the piston 20.

A magnetic field generated by the permanent magnet 18 is formed between the permanent magnet 18 and the cylinder 16. When an alternating current is supplied to the coil 19 disposed between the permanent magnet 18 and the cylinder 16, the coil 19 is supplied with the alternating current according to the frequency of the supplied alternating current. A thrust is applied to the piston 19, and the piston 20 connected to the coil 19 is driven in the axial direction. That is, the permanent magnet 18 and the coil 18 constitute a linear motor 26.

Next, the electric circuit shown in FIG. 3 will be described. The control means 13 is mainly composed of a microcomputer 27, and has an input terminal I ₁ , output terminals O ₁ , O ₂ ,
It has O ₃ .

The refrigerator 27 is connected to the input terminal I ₁ of the microcomputer 27. The output terminals O ₁ and O ₂ of the microcomputer 27 are connected to a refrigerator damper 6 and an evaporator fan 9.

Converter circuit 28 for converting AC to DC
Are connected to a commercial power supply. An electrolytic capacitor 29 is provided on the positive side of the DC output section of the converter circuit 28.
Transistor TR in the inverter circuit 30
1, the collectors of TR3 are connected. On the negative side of the DC output section of the converter circuit 28, the negative side of the electrolytic capacitor 29, the transistors TR2 and
The emitter of TR4 is connected.

In the inverter circuit 30, the emitter of TR1 and the collector of TR2 are connected, and the emitter of TR3 and T
The collector of R4 is connected, and the coil 18 of the vibrating compressor 7 is connected between the emitter of TR1 and the emitter of TR3. Then, according to a signal from the base stripe circuit 31, TR1 and TR4 and TR3 and TR2 are each paired and repeatedly turned ON / OFF.

An analog position signal of the piston 20 from the displacement detector 25 is converted into a digital signal via an A / D converter 32, and is input to an input terminal I _{3 of the} microcomputer 27.
Is input to the top dead center position calculating means 33. The top dead center position calculation means 33 compares the preset top dead center reference value (first predetermined value) with the current top dead center position signal and outputs the signal to the output base drive circuit 31 according to the difference.

With respect to the refrigerator configured as described above,
The operation will be described below with reference to the flowchart of FIG.

In step 1, the power is turned on. During normal operation of the refrigerator, a freezing compartment temperature signal from the freezer compartment temperature detector 4 at step 2, input to the input terminal I ₁ of the microcomputer 27, the current of the freezing compartment temperature and the upper limit set temperature (-18 ° C. so) If the temperature of the freezer compartment is equal to or higher than the upper limit set temperature, the process proceeds to step 3, in which the vibration compressor 7 is operated and the evaporator fan 10 is operated.

In the control means 13, the electrolytic capacitor 29 is charged via the converter circuit 28 and supplies DC power to the inverter circuit 30. When an operation command for the vibrating compressor 7 is issued from the microcomputer 27, an inverter waveform is output from the base drive circuit 31, and TR1 and TR4 and TR3 and TR2 of the inverter circuit 30 are turned on / off alternately as a pair. repeat.

The power obtained by converting the direct current to the alternating current from the inverter circuit 30 is supplied to the coil 19 of the vibrating compressor 7, the vibrating compressor 7 starts operating, and the piston 20 connected to the coil 19 supplies the alternating current. Vibrates in the axial direction of the cylinder 16 in accordance with the frequency of the refrigerant, and the refrigerant is compressed in the compression chamber 23.

At steps 5, 6, and 7, control is performed to maintain the top dead center position of the piston 20 at a first predetermined value. In step 5, the position signal of the piston 20 from the displacement detector 25 is compared with a top dead center reference value (first predetermined value), and the current top dead center position is compared with the top dead center reference value (first predetermined value). If it is large (if it is on the anti-compressor side), at step 5 the inverter output is set to 1
Increase the level. If the current top dead center position is smaller than the top dead center reference value (first predetermined value) (if it is on the compressor side), the inverter output is reduced by one step in step 7.

As shown in Table 1, the vibration type compressor 7 has the characteristic that the piston center position changes and the stroke changes depending on the condensation temperature and the evaporation temperature. When the condensing temperature and the evaporating temperature are high, that is, under high load conditions, the center position of the piston moves toward the anti-compression chamber side as shown in steps 9, 10, and 11, the stroke increases, and the compressor capacity naturally increases. To increase. Conversely, when the condensing temperature and the evaporating temperature are low, that is, when the load is light, the steps 15, 16, 1 are performed.
As shown in FIG. 7, the center position of the piston moves toward the compression chamber, the stroke is reduced, and the compressor capacity is naturally reduced.

Accordingly, the condensing temperature and the evaporating temperature increase in a high temperature such as in summer, so that the refrigerating capacity naturally increases and the lack of cooling is eliminated, and the condensing temperature and the evaporating temperature decrease in a low temperature in winter or the like. And the refrigeration capacity is reduced to reduce input and perform power saving operation.

As described above, the refrigerator of the present embodiment has a cylindrical cylinder 16 provided with the suction valve 20 and the discharge valve 21.
A piston 19 disposed in the cylinder 16, a linear motor such as a linear motor 26 for connecting a shaft to the piston 19 and reciprocating the piston 19 in the axial direction, and a shaft for the linear motor 26. A vibration compressor 7 including a resonance spring 23, a condenser 14, a pressure reducer 15,
By operating the vibratory compressor 7 with the cooling system in which the evaporator 8 is sequentially joined and the piston 19 at the top dead center clearance maintained at the first predetermined value regardless of the pressure condition of the cooling system. A control means 13 for increasing the refrigerating capacity by increasing the stroke when the evaporating temperature and the condensing temperature rise, and decreasing the refrigerating capacity by decreasing the stroke when the evaporating temperature and the condensing temperature fall. doing.

Therefore, when the load is high, the refrigerating capacity is naturally increased to eliminate the cooling shortage, and when the load is light, the refrigerating capacity is naturally reduced, the input is reduced, and the power consumption can be reduced.

[0041]

[Table 1]

(Embodiment 2) Next, a second embodiment of the present invention will be described with reference to the drawings. The configurations of the refrigerator, the vibrating compressor and the electric circuit are the same as those of the first embodiment, and the detailed description is omitted. FIG. 5 is an operation flowchart of the second embodiment of the present invention.

With respect to the refrigerator configured as described above,
The operation will be described below with reference to the flowchart of FIG.

In step 21, the power is turned on. During normal operation of the refrigerator, the vibration compressor 7 is operated in step 22 according to steps 1 to 17 described in the second embodiment.

Next, in step 23, the operation time of the variable capacity compressor 7 is integrated in the microcomputer 27, and the integrated time is compared with the set time. Start frost. If the accumulated time is shorter than the set time, the process returns to step S22.

In step 24, the microcomputer 2
7, the top dead center reference value preset by the top dead center position calculating means 33 is changed to a second predetermined value larger than the first predetermined value.

In steps 25, 26 and 27, the piston 20
Is controlled to maintain the top dead center position at the second predetermined value.
In step 25, the position signal of the piston 20 from the displacement detector 25 is compared with the top dead center reference value (second predetermined value), and the current top dead center position is compared with the top dead center reference value (second predetermined value). If it is larger (if it is on the side opposite to the compression chamber), the inverter output is increased by one step in step 5. If the current top dead center position is smaller than the top dead center reference value (the second predetermined value) (if it is on the compression chamber side), the inverter output is reduced by one step in step 5.

In step 28, the refrigerator compartment damper 6 is closed. At this time, the top dead center position of the piston 20 of the variable capacity compressor 7 is moved toward the anti-compression chamber side to reduce the stroke, reduce the capacity, reduce the compression ratio, and reduce the evaporation temperature of the refrigerant in the evaporator 8. To 0 ° C. or higher.

The refrigerant evaporation temperature gradually increases, and the refrigerant evaporation temperature increases from 5 ° C. to about 10 ° C. Then, the frost adhering to the surface of the evaporator 8 is melted by heat transfer from the inside of the evaporator 8 piping to perform defrosting.

At step 29, the evaporator temperature signal of the evaporator temperature detector 34 provided in a part of the pipe of the evaporator 8 is compared with the defrosting end set temperature (around 15 ° C.), and the evaporator temperature signal is obtained. If the temperature is equal to or higher than the third set temperature, it is determined that the defrosting has been completed, and the process proceeds to step 30, where the integrated operation time of the vibration compressor 7 is reset.

At step 31, the microcomputer 2
The top dead center reference point preset by the top dead center position calculating means 33 is returned from the second predetermined value to the original first predetermined value.

As described above, during the defrosting of the evaporator 8, the refrigerator according to the present embodiment is configured such that the top dead center position of the piston 20 is maintained at the second predetermined value larger than the first predetermined value. By operating the compressor 7, the evaporator is defrosted by setting the evaporating temperature to 0 ° C. or higher, and when the detected temperature of the evaporator temperature detector 34 becomes equal to or higher than the defrosting end set temperature, the evaporator is turned on. And control means 13 for returning the dead center position from the second predetermined value to the first predetermined value.

Therefore, by increasing the refrigerant temperature without using the heat of the heater during defrosting and performing defrosting, the temperature of food in the freezer compartment does not rise temporarily and the freshness holding period is not shortened. In addition, the temperature rise of the evaporator and the freezing room is eliminated, and the time for cooling the freezing room temperature to the predetermined temperature after the completion of the defrosting is greatly shortened, so that the power consumption can be significantly reduced. Further, the elimination of the defrost heater enables a significant cost reduction.

(Embodiment 3) Next, a third embodiment of the present invention will be described with reference to the drawings. The configurations of the refrigerator, the vibrating compressor and the electric circuit are the same as those of the first embodiment, and the detailed description is omitted. FIG. 5 is an operation flowchart of the third embodiment of the present invention.

With respect to the refrigerator configured as described above,
The operation will be described below with reference to the flowchart of FIG.

In step 41, the power is turned on. During the normal operation of the refrigerator, the vibration compressor 7 is operated in step 42 according to steps 1 to 17 described in the second embodiment.

Next, at step 43, the operation time of the variable capacity compressor 7 is integrated in the microcomputer 27, and the integrated time is compared with the set time. Start frost. If the accumulated time is shorter than the set time, the process returns to step 42.

The outside air temperature of the refrigerator 1 is detected by the outside air temperature detector 35 by the piston 44. Then, in step 45,
When the top dead center reference value preset by the top dead center position calculating means 33 is changed to a second predetermined value larger than the first predetermined value, the second predetermined value is changed in accordance with the outside air temperature.

At steps 46, 47 and 48, the piston 20
Is controlled to maintain the top dead center position at the second predetermined value.
In step 46, the position signal of the piston 20 from the displacement detector 25 is compared with a top dead center reference value (second predetermined value), and the current top dead center position is compared with the top dead center reference value (second predetermined value). If it is larger (if it is on the opposite side of the compression chamber), the inverter output is increased by one step in step 47. If the current top dead center position is smaller than the top dead center reference value (second predetermined value) (if it is on the compression chamber side), the inverter output is reduced by one step in step 48.

In step 49, the refrigerator compartment damper 6 is closed. At this time, the top dead center position of the piston 20 of the variable capacity compressor 7 is moved toward the anti-compression chamber side to reduce the stroke, reduce the capacity, reduce the compression ratio, and reduce the evaporation temperature of the refrigerant in the evaporator 8. To 0 ° C. or higher.

The refrigerant evaporation temperature gradually increases, and the refrigerant evaporation temperature increases from 5 ° C. to about 10 ° C. Then, the frost adhering to the surface of the evaporator 8 is melted by heat transfer from the inside of the evaporator 8 piping to perform defrosting.

In step 50, the evaporator temperature signal of the evaporator temperature detector 34 provided in a part of the pipe of the evaporator 8 is compared with the defrosting end set temperature (about 15 ° C.). If the temperature is equal to or higher than the third set temperature, it is determined that the defrosting has been completely completed, and the routine proceeds to step 51, where the integrated operation time of the vibration compressor 7 is reset.

At step 52, the microcomputer 2
The top dead center reference value preset by the top dead center position calculation means 33 is returned from the second predetermined value to the original first predetermined value.

As described above, during the defrosting of the evaporator 8, the refrigerator according to the present embodiment is configured such that the top dead center position of the piston 20 is maintained at the second predetermined value larger than the first predetermined value. The compressor 7 is operated, the second predetermined value is changed in accordance with the outside air temperature, the evaporating temperature is set to 0 ° C. or more, and the evaporator is defrosted. And a control means 13 for returning the top dead center position of the piston 20 from the second predetermined value to the first predetermined value when the temperature becomes equal to or higher than the defrosting end set temperature.

Therefore, it has the effect that more effective defrosting can be performed.

[0066]

As described above, the present invention relates to a cylinder in a cylindrical state provided with a suction valve and a discharge valve, a piston disposed in the cylinder, and a shaft connected to the piston to move the piston in the axial direction. A linear motor such as a linear motor that reciprocates, and a vibrating compressor including a resonance spring connected to the shaft of the linear motor, a condenser, a decompressor, and a cooling system in which an evaporator is sequentially joined. By operating the vibrating compressor while maintaining the top dead center position of the piston at the first predetermined value regardless of the pressure condition of the cooling system, when the evaporation temperature and the condensation temperature rise, the stroke is reduced. Control means for increasing the refrigerating capacity by increasing the refrigerating capacity and decreasing the refrigerating capacity by decreasing the stroke when the evaporating temperature and the condensing temperature fall. At the time of load lowering the natural refrigeration capacity,
Input can be reduced, and power consumption can be reduced.

Further, during the defrosting of the evaporator, the evaporating temperature is reduced by operating the vibrating compressor with the top dead center position of the piston maintained at a second predetermined value larger than the first predetermined value. The defrosting of the evaporator is performed at 0 ° C. or higher, and the top dead center position of the piston is changed from the second predetermined value to the first predetermined value when the detected temperature of the evaporator temperature detector becomes equal to or higher than the defrost end setting temperature. Control means for returning the temperature of the refrigerant in the freezer compartment by temporarily increasing the refrigerant temperature without using the heat of the heater at the time of defrosting, thereby temporarily increasing the food temperature in the freezing room and shortening the freshness holding period. Never be. In addition, the temperature rise of the evaporator and the freezing room is eliminated, and the time for cooling the freezing room temperature to the predetermined temperature after the completion of the defrosting is greatly shortened, so that the power consumption can be significantly reduced.

During the defrosting of the evaporator, the vibrating compressor is operated while the top dead center position of the piston is kept at a second predetermined value larger than the first predetermined value, and the position of the piston is controlled according to the outside air temperature. Then, the value of the second predetermined value is changed, the evaporator is defrosted by setting the evaporating temperature to 0 ° C. or higher, and the piston is defrosted when the detected temperature of the evaporator temperature detector becomes equal to or higher than the defrost end set temperature. And control means for returning the top dead center position from the second predetermined value to the first predetermined value, so that more effective defrosting can be performed.

[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 sectional view of the vibration type compressor according to the embodiment.

FIG. 3 is an electric circuit diagram of the device.

FIG. 4 is an operation flowchart of the apparatus.

FIG. 5 is an operation flowchart of a second embodiment of the present invention.

FIG. 6 is an operation flowchart of a third embodiment of the present invention.

FIG. 7 is a configuration diagram of a conventional refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Freezer compartment 3 Refrigerator compartment 4 Freezer compartment temperature detector 5 Refrigerator compartment temperature detector 6 Refrigerator compartment damper 7 Vibration compressor 8 Evaporator 13 Control means

Claims (3)

[Claims] 1. A cylinder having a cylindrical body provided with a suction valve and a discharge valve, a piston disposed in the cylinder, a linear motor connected to a shaft of the piston to reciprocate the piston in an axial direction, and the like. A linear motor, a vibrating compressor composed of a resonance spring connected to the shaft of the linear motor, a cooling system in which a condenser, a decompressor, and an evaporator are sequentially joined, and a pressure condition of the cooling system. Regardless, by operating the vibrating compressor with the top dead center position of the piston maintained at the first predetermined value, when the evaporation temperature and the condensation temperature rise, the stroke increases, thereby increasing the refrigeration capacity. And a control means for increasing the temperature and decreasing the stroke when the evaporating temperature and the condensing temperature decrease, thereby decreasing the refrigerating capacity. 2. During the defrosting of the evaporator, the vibration type compressor is operated in a state where the top dead center position of the piston is maintained at a second predetermined value which is larger than the first predetermined value. Is set to 0 ° C. or more to perform defrosting of the evaporator. When the detected temperature of the evaporator temperature detector becomes equal to or higher than the defrosting end set temperature, the top dead center position of the piston is changed from a second predetermined value to a first predetermined value. 2. The refrigerator according to claim 1, further comprising control means for returning the temperature to the temperature. 3. The vibrating compressor is operated while the top dead center position of the piston is kept at a second predetermined value larger than the first predetermined value while the evaporator is being defrosted. Correspondingly, the value of the second predetermined value is changed, the defrosting of the evaporator is performed by setting the evaporating temperature to 0 ° C. or higher, and when the detected temperature of the evaporator temperature detector becomes equal to or higher than the defrost end set temperature, 2. The refrigerator according to claim 1, further comprising control means for returning the position of the top dead center of the piston from the second predetermined value to the first predetermined value.