JP2005127654A - Freezer-refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve reliability of a compressor by restricting temperature rise with respect to excessive temperature rise of a discharge gas temperature of the compressor and a controller for controlling operation frequency of electric power to the compressor since, when outdoor temperature is high, the operation of the compressor just after power-on is conducted at the maximum operation frequency of the compressor despite large load on the compressor. <P>SOLUTION: A freezer-refrigerator is structured so that the operation frequency of the compressor 1 just after power-on when the outdoor temperature is high can be fixed as an operation frequency lower than the maximum operation frequency for a predetermined period of time. Whereby, reliability can be improved as load on the compressor is decreased and excessive temperature rise of the discharge gas of the compressor 1 and the controller 19 are restricted. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a refrigerator-freezer, and more particularly, to a refrigerator that includes a plurality of evaporators, and a switching valve alternately switches a flow path of a refrigerant to each evaporator, and alternately cools the interior of each refrigerator.

  In recent years, there has been proposed a refrigerator-freezer that is divided into a plurality of compartments and provided with an evaporator in each compartment for cooling (see, for example, Patent Document 1).

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

  FIG. 3 is a refrigeration cycle configuration diagram of a conventional refrigerator-freezer, and FIG. 4 is a power supply voltage, a switching valve operation, a compressor operating frequency, a compressor discharge gas temperature, a controller temperature, and a refrigerator compartment sensor during operation of the conventional refrigerator-freezer. It is a timing chart of the temperature of this and the temperature of a freezer compartment sensor.

  As shown in FIG. 3, the refrigeration cycle of the conventional refrigerator-freezer control method includes a compressor 1, a discharge pipe 2 of the compressor 1, a condenser 3 provided on the downstream side of the discharge pipe 2, and a condenser 3. A switching valve 4 provided on the downstream side, a refrigerator compartment evaporator 6 installed in the refrigerator compartment 5, a refrigerator compartment capillary 7 branched from the selector valve 4 and communicating with the refrigerator compartment evaporator 6, and a freezer compartment 8, a freezer compartment evaporator 9, a freezer compartment capillary 10 that branches from the switching valve 4 and communicates with the freezer compartment evaporator 9 and the switching valve 4, a suction pipe 11 of the compressor 1, and refrigeration. A connecting pipe 12 that connects the downstream side of the chamber evaporator 6 and the downstream side of the freezer compartment evaporator 9 and simultaneously connects to the suction pipe 11, and a refrigerator compartment sensor 13 that is installed in the refrigerator compartment 5 and detects the temperature of the refrigerator compartment 5. A freezer sensor 14 installed in the freezer 8 for detecting the temperature of the freezer 8, and the outside air temperature An outside air temperature sensor 15 to be detected, and a control device 16 composed of electronic components that detect the temperature of the refrigerator compartment sensor 13, the freezer compartment sensor 14, and the outside air temperature sensor 15 and supply power to the compressor 1 to control the operating frequency. Has been.

  About the refrigerator refrigerator comprised as mentioned above, the operation | movement is demonstrated below.

  First, when the power is turned on, the control device 16 determines the operating frequency of the compressor 1 according to the detected temperatures of the outside air temperature sensor 15 and the freezer compartment sensor 14. The operating frequency of the compressor 1 is determined to be a high frequency if the detected temperature of the freezer compartment sensor 14 is high, and conversely, if the detected temperature of the freezer compartment sensor 14 is low, the operating frequency is determined to be a low frequency. Limited by sensor 15. If the detected temperature of the outside air temperature sensor 15 is high, it is limited to a high operating frequency. Conversely, if the detected temperature of the outside temperature sensor 15 is low, it is limited to a low operating frequency. Accordingly, when the power is turned on, the temperature of the freezer compartment 8 is substantially equal to the outside air temperature, and the detected temperature of the freezer compartment sensor 14 is higher than the freezer temperature. Therefore, the operating frequency of the compressor 1 is limited by the detected temperature of the outside air temperature sensor 15. The operation is started at the upper limit operation frequency (70 Hz). When the compressor 1 starts operation, the compressed high-temperature and high-pressure gasified refrigerant is discharged from the discharge pipe 2 and liquefied by the condenser 3. The flow path of the switching valve 4 is switched to the freezer compartment evaporator 9 side immediately after the power is turned on (arrow 17). The liquefied refrigerant is decompressed by the freezer compartment capillary 10, and the freezer compartment evaporator 9 cools the freezer compartment 8. Then evaporate. (Hereinafter, the state where the switching valve 4 is switched to the freezer compartment evaporator 9 side is referred to as a freezer compartment cooling mode.) The refrigerant evaporated and gasified in the freezer compartment evaporator 9 is connected to the connection pipe 12 and the suction pipe 11. A refrigeration cycle that flows in sequence and is compressed again by the compressor 1 is continuously performed. At this time, since the temperature of the freezer compartment 8 is gradually lowered, the freezer compartment sensor 14 is also gradually lowered. However, since the temperature of the freezer compartment 8 is high, the compressor 1 is subjected to a heavy load, and the compressor discharge gas temperature and control are increased. The temperature of the device 16 increases.

  Next, when either the freezing chamber cooling mode is performed for a predetermined time or the detection temperature of the freezing chamber sensor 14 is equal to or lower than the predetermined cooling temperature, the switching valve 4 is on the refrigerator compartment evaporator 6 side. The flow path is switched to (arrow 18), and the liquefied refrigerant is decompressed by the refrigerating chamber capillary 7, and the refrigerating chamber evaporator 6 cools the refrigerating chamber 5 to evaporate. (Hereinafter, the state in which the flow path of the switching valve 4 is switched to the refrigerator compartment evaporator 6 side is referred to as the refrigerator compartment cooling mode.) The refrigerant evaporated and gasified in the refrigerator compartment evaporator 6 is the connection pipe 12 and the suction pipe 11. The refrigeration cycle that flows in this order and is compressed again by the compressor 1 is continuously performed. The operating frequency of the compressor 1 at this time is determined by the refrigerator compartment sensor 13 and the outside air temperature sensor 15 in the same manner as in the freezer compartment cooling mode, but immediately after the power is turned on, the temperature of the refrigerator compartment 5 is almost equal to the outside air temperature. Equally, since the temperature detected by the cold room sensor 13 is higher than the temperature at the cold room, the operation frequency of the compressor 1 continues to operate at the upper limit frequency (70 Hz) limited by the temperature detected by the outside air temperature sensor 15. At this time, since the temperature of the refrigerator compartment 5 gradually decreases, the refrigerator compartment sensor 13 also gradually decreases. However, since the temperature of the refrigerator compartment 5 is high, the compressor 1 is heavily loaded, and the compressor discharge gas temperature, The temperature of the control device 16 further increases.

  Further, when either one of the cold room cooling mode is performed for a predetermined time or the temperature detected by the cold room sensor 13 is equal to or lower than the predetermined cooling temperature, the switching valve 4 is again connected to the freezer compartment evaporator 9 side. The flow path is switched to, the operating frequency of the compressor 1 is determined according to the detected temperatures of the outside air temperature sensor 15 and the freezer compartment sensor 14, and the freezer compartment cooling mode is performed. At this time, the compressor discharge gas temperature and the temperature of the control device 16 further increase.

  Thereafter, the freezer compartment cooling mode and the refrigerator compartment cooling mode are alternately repeated, the operation frequency of the compressor 1 is determined for each mode, and the freezer compartment 8 and the refrigerator compartment 5 are gradually cooled to a predetermined cooling temperature. . At this time, the load applied to the compressor 1 reaches a certain time peak, and the compressor discharge gas temperature and the temperature of the control device 16 also reach the peak. Thereafter, the load applied to the compressor 1 gradually decreases, and the compressor discharge The gas temperature and the temperature of the control device 16 also gradually decrease.

Further, when the freezer compartment 8, the refrigerator compartment, and the G are cooled and the detected temperatures of the freezer compartment sensor 14 and the refrigerator compartment sensor 13 are both equal to or lower than a predetermined cooling temperature, the operation of the compressor 1 is stopped. However, if the detected temperature of the freezer sensor 14 or the refrigerator compartment sensor 13 becomes higher than a predetermined cooling temperature while the compressor 1 is stopped, the operation of the compressor 1 is started again.
JP 2001-91130 A

  However, in the above conventional configuration, the operating frequency of the compressor 1 is determined according to the detected temperatures of the outside air temperature sensor 15, the freezer compartment sensor 14 and the refrigerating compartment sensor 13, so when the outside air temperature is high, immediately after turning on the power. Since the inside temperatures of the freezer compartment α and the H refrigerator compartment 5 are also high, the compressor 1 is operated at the maximum operating frequency even though the load applied to the compressor is large. The discharge gas temperature rises excessively, and the reliability of the compressor 1 is adversely affected. Further, the temperature of the electronic components constituting the control device 16 that controls the operating frequency by supplying electric power to the compressor 1 also rises excessively, and the reliability of the control device 16 is adversely affected. was there.

  The present invention solves the conventional problems, and an object thereof is to provide a refrigerator-freezer in which the reliability of the compressor is improved and the reliability of the control device is further improved.

The present invention includes an outside air temperature sensor that detects an outside air temperature, a refrigerating room sensor that detects the temperature of the refrigerating room, a freezing room sensor that detects the temperature of the freezing room, a refrigerating room evaporator for cooling the refrigerating room, A freezer compartment evaporator for cooling the freezer compartment, a compressor with a variable number of revolutions, and the evaporator is connected in parallel, and a refrigerant flow path from the compressor is connected to the refrigerator compartment evaporator and the freezer compartment evaporator. A switching valve for switching, and a control device for supplying electric power to the compressor and controlling an operating frequency, and when the outside air temperature sensor detects a set temperature or more immediately after turning on the power, the refrigerator compartment sensor and the freezer compartment When at least one of the sensors detects a set temperature or higher, the operating frequency of the compressor in the freezer cooling mode and the operating frequency of the compressor in the freezer cooling mode are the maximum within a predetermined time after turning on the power. It is characterized in that the compressor is operated by being separately fixed at an operating frequency lower than the operating frequency, and the load on the compressor is reduced, and an excessive increase in the discharge gas temperature of the compressor is suppressed. Then, the reliability of the compressor is improved, and an excessive increase in the temperature of the control device is suppressed to improve the reliability of the control device.

  As described above, according to the first aspect of the present invention, when the outside air temperature sensor detects the set temperature or more immediately after the power is turned on, at least one of the refrigerator compartment sensor and the freezer compartment sensor detects the set temperature or more. In this case, the compressor operating frequency in the cold room cooling mode and the operating frequency of the compressor in the cold room cooling mode are fixed to operating frequencies lower than the maximum operating frequency within a predetermined time after turning on the power, respectively. Therefore, the load on the compressor is reduced, the excessive increase in the compressor discharge gas temperature is suppressed, the reliability of the compressor is improved, and the excessive increase in the temperature of the control device is further suppressed. Reliability can be improved.

  The invention according to claim 1 of the present invention includes an outside temperature sensor for detecting outside temperature, a refrigerating room sensor for detecting the temperature of the refrigerating room, a freezing room sensor for detecting the temperature of the freezing room, and cooling the refrigerating room. A freezer compartment evaporator for cooling, a freezer compartment evaporator for cooling the freezer compartment, a compressor having a variable rotation speed, and the evaporator connected in parallel to evaporate the refrigerant flow path from the compressor. And a control valve that supplies power to the compressor to control the operating frequency, and when the outside temperature sensor detects a set temperature or more immediately after power-on, When at least one of the refrigerator compartment sensor and the freezer compartment sensor detects a set temperature or higher, the operating frequency of the compressor in the freezer compartment cooling mode and the temperature in the refrigerator compartment cooling mode are within a predetermined time after turning on the power. Above The compressor is operated with the operating frequency of the compressor being fixed to an operating frequency lower than the maximum operating frequency, respectively, and the load applied to the compressor is reduced, and the discharge gas of the compressor is reduced. An excessive increase in temperature is suppressed to improve the reliability of the compressor, and an excessive increase in temperature of the control device is further suppressed to improve the reliability of the control device.

  Hereinafter, embodiments of a refrigerator-freezer according to the present invention will be described with reference to the drawings. In addition, about the structure same as the past, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

(Embodiment 1)
FIG. 1 is a refrigeration cycle configuration diagram of a refrigerator-freezer according to Embodiment 1 of the present invention, and FIG. 2 is a power supply voltage, switching valve operation, compressor operating frequency, compressor discharge gas during operation of the refrigerator-freezer of the embodiment. It is a timing chart of temperature, the temperature of a control apparatus, the temperature of a refrigerator compartment sensor, and the temperature of a freezer compartment sensor.

  In FIG. 1, the control device 19 is composed of electronic components that detect the temperatures of the refrigerator compartment sensor 13, the freezer compartment sensor 14, and the outside air temperature sensor 15 and apply power to the compressor 1 to control the operating frequency.

  About the refrigerator refrigerator comprised as mentioned above, the operation | movement is demonstrated below.

  First, when the refrigerator is turned on, the control device 19 detects the temperatures of the outside air temperature sensor 15 and the freezer compartment sensor 14. At this time, when the detected temperature is 30 ° C. or more, which is the set value, the operating frequency of the compressor 1 is not the maximum operating frequency (70 Hz) regardless of the detected temperature of the refrigerator compartment sensor 13 and is one step in the freezer compartment cooling mode. It is fixed at a low operating frequency (60 Hz) and is further fixed at a lower operating frequency (50 Hz) in the refrigerating room cooling mode, and the freezing room cooling mode and the refrigerating room cooling mode are alternated for 4 hours, which is a predetermined time after the power is turned on Repeated.

  Next, when 4 hours, which is a predetermined time, elapses after the power is turned on, the operating frequency of the compressor 1 is not fixed and is determined according to the detected temperatures of the outside air temperature sensor 15, the freezer compartment sensor 14, and the refrigerator compartment sensor 13. The operation is continued.

  However, the freezer compartment 8, the refrigerator compartment, and the G are cooled within 4 hours, which is a predetermined time after the power is turned on, and the detected temperatures of the freezer compartment sensor 14 and the refrigerator compartment sensor 13 are both equal to or lower than the prescribed cooling temperature. At the time, the operation of the compressor 1 is stopped, and the operation frequency is not fixed when the operation of the compressor 1 is started next time, and is determined according to the detected temperatures of the outside air temperature sensor 15, the freezer compartment sensor 14 and the refrigerator compartment sensor 13. Is done.

  On the other hand, when the temperature of the outside air temperature sensor 15 and the freezer compartment sensor 14 is lower than the set value 30 ° C. when the controller 19 is turned on when the refrigerator is turned on, the outside air temperature sensor 15 and the freezer The operating frequency of the compressor 1 is determined according to the temperature detected by the room sensor 14 and the cold room sensor 13.

  As described above, the refrigerator-freezer of the present embodiment is a control composed of electronic components that detect the temperatures of the refrigerator compartment sensor 13, the freezer compartment sensor 14, and the outside air temperature sensor 15 and supply power to the compressor 1 to control the operating frequency. When the temperature detected by the outside air temperature sensor 15 and the freezer compartment sensor 14 is 30 ° C. or more which is a set value when the power is turned on, the operating frequency of the compressor 1 is not the maximum operating frequency (70 Hz), In the freezer compartment cooling mode, the operation frequency is fixed to one step lower (60 Hz), and in the refrigerating compartment cooling mode, the operation frequency is fixed to one step lower (50 Hz). Since the refrigerator compartment cooling mode is alternately repeated, the compressor 1 is operated at a low operation frequency when the load applied to the compressor 1 reaches a peak. 1, the excessive increase in the discharge gas temperature of the compressor 1 is suppressed, the reliability of the compressor 1 is improved, and the excessive increase in the temperature of the control device 19 is further suppressed, so that the reliability of the control device 19 is improved. Can be improved.

  In the present embodiment, the detection temperatures of the outside air temperature sensor 15 and the freezer compartment sensor 14 are compared with the set value of 30 ° C., but the detection temperatures of the outside air temperature sensor 15 and the refrigerator compartment sensor 13 may be used. Even if the detected temperatures of the outside air temperature sensor 15 and the refrigerating room sensor 13 are compared with a set value of 30 ° C., the same effect as the present embodiment can be obtained.

  Further, in the present embodiment, the set value for comparing the detected temperature of the outside air temperature sensor 15 and the freezer compartment sensor 14 is compared with the same 30 ° C., but the detected temperature of the outside air temperature sensor 15 and the detected temperature of the freezer compartment sensor 14 are compared. Different set values may be provided for each. By providing different set values for the detected temperature of the outside air temperature sensor 15 and the detected temperature of the freezer compartment sensor 14, the magnitude of the load applied to the compressor 1 can be set in detail. As a result, the reliability of the control device 19 can be improved.

As described above, the present invention reduces the load on the compressor, suppresses an excessive increase in the compressor discharge gas temperature, improves the reliability of the compressor, and further suppresses an excessive increase in the temperature of the control device. The reliability of the control device can be improved, and it can be widely applied to the field of cooling equipment.

Refrigeration cycle block diagram of Embodiment 1 of the refrigerator-freezer according to the present invention Timing chart of power supply voltage, switching valve operation, compressor operating frequency, compressor discharge gas temperature, control device temperature, refrigerator temperature, freezer temperature during operation of the refrigerator-freezer of the embodiment Refrigeration cycle configuration diagram of conventional refrigerator-freezer Timing chart of power supply voltage, switching valve operation, compressor operating frequency, compressor discharge gas temperature, controller temperature, refrigerator temperature, and freezer temperature during conventional refrigerator-freezer operation

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 4 Switching valve 6 Cold room cooler 9 Freezer room cooler 13 Cold room sensor 14 Freezer room sensor 15 Outside temperature sensor 19 Control apparatus

Claims (1)

  An outside air temperature sensor for detecting the outside air temperature, a refrigerating room sensor for detecting the temperature of the refrigerating room, a freezing room sensor for detecting the temperature of the freezing room, a refrigerating room evaporator for cooling the refrigerating room, and a freezing room A freezer compartment evaporator for cooling, a compressor having a variable number of revolutions, a switching valve for switching the refrigerant flow path from the compressor to the refrigerator compartment evaporator and the freezer compartment evaporator, wherein the evaporator is connected in parallel. And a control device for supplying electric power to the compressor and controlling an operating frequency, and when the outside temperature sensor detects a set temperature or more immediately after turning on the power, further, at least one of the refrigerator compartment sensor and the freezer compartment sensor When either of them detects a set temperature or higher, the operating frequency of the compressor when the switching valve is switched to the refrigerator compartment evaporator within a predetermined time after power-on and the switching valve is the freezer compartment evaporator. In Refrigerator was characterized by operating the compressor operation frequency of said compressor when on behalf Ri and each being separately secured to the lower operating frequency than the maximum operating frequency.

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