JP2013068388A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerator that can improve cooling efficiency and reduce power consumption.SOLUTION: The refrigerator includes: a compressor; a condenser; a freezing evaporator which cools a freezer compartment; a refrigerating evaporator which cools a refrigerator compartment; a switching valve which selects the freezing evaporator or the refrigerating evaporator to be supplied with the refrigerant; and a heat radiation fan which cools the condenser. When the mode is changed to a freezing cooling mode for supplying the refrigerant to the freezing evaporator from a refrigeration cooling mode for supplying the refrigerant to the refrigerating evaporator, the refrigerator performs first control to rotate the heat radiation fan at a predetermined speed Nr in the freezing cooling mode. When the mode is changed from a stop mode for stopping the compressor to the freezing cooling mode, the refrigerator performs second control to stop the heat radiation fan or to rotate the heat radiation fan at a speed lower than the predetermined speed Nr in the freezing cooling mode.

Description

  This embodiment relates to a refrigerator.

  Conventionally, in a refrigerator, by reducing the temperature of the compressor and condenser constituting the refrigeration cycle, the refrigerant condensation temperature is lowered and the cooling efficiency is improved. If the condenser is radiating heat, but the outside air temperature is low, for example, if the temperature of the refrigerator is 10 ° C or lower, driving the radiating fan will cause excessive heat dissipation and the refrigerant will stay in the condenser. This causes a so-called refrigerant stagnation phenomenon in which the cooling efficiency is lowered without being circulated through the refrigeration cycle.

  In view of this, there has been proposed a control in which the radiating fan is stopped to prevent a refrigerant stagnation phenomenon when the outside air temperature is low (see, for example, Patent Document 1 below).

  By the way, the refrigerator is provided with an evaporator for cooling the freezer storage room and the refrigerated storage room, respectively, and the refrigerant discharged from the compressor and circulated through the condenser by the switching valve is switched to the freezing evaporator and the refrigeration evaporator. Supplying the refrigerant to the refrigeration evaporator to cool the refrigeration storage chamber by flowing the refrigerant, the refrigeration cooling mode to flow the refrigerant to the refrigeration evaporator to cool the refrigeration storage chamber, and stopping the compressor There has been known one that switches and executes a stop mode in which the supply of the refrigerant to the freezing evaporator and the refrigerating evaporator is stopped.

  In the refrigerator that switches between the cooling modes as described above, even when the outside air temperature is low, the refrigerant may circulate properly in the refrigeration cycle. There is a risk of worsening.

JP 2009-144969 A

  The present invention has been made in consideration of the above-described problems, and an object of the present invention is to provide a refrigerator that can improve cooling efficiency and reduce power consumption in a refrigerator that switches and executes a cooling mode.

  The refrigerator according to the present invention includes a compressor, a condenser, a refrigeration evaporator for cooling the refrigeration storage room, a refrigeration evaporator for cooling the refrigeration storage room, the refrigeration evaporator, and the refrigeration evaporator. A refrigeration cooling mode for flowing the refrigerant to the refrigeration evaporator, a refrigeration cooling mode for flowing the refrigerant to the refrigeration evaporator, and a refrigeration cooling mode for flowing the refrigerant to the refrigeration evaporator; In the refrigerator that switches and executes the stop mode for stopping the compressor and stopping the supply of the refrigerant to the refrigeration evaporator and the refrigeration evaporator, in the refrigeration cooling mode switched from the refrigeration cooling mode, the The first control for rotating the heat dissipating fan at a predetermined speed is executed, and the heat dissipating fan is stopped in the refrigeration cooling mode switched from the stop mode, or from the predetermined speed And executes a second control to rotate the cooling fan at a rotational speed are.

It is sectional drawing of the refrigerator concerning the 1st Embodiment of this invention. It is a figure which shows the refrigerating cycle of the refrigerator of FIG. It is a timing chart of the operation control of the refrigerator of FIG. 1, Comprising: The case where outside temperature is an intermediate temperature range is shown. It is a timing chart of the driving | operation control of the refrigerator of FIG. 1, Comprising: The case where outside temperature is a high temperature zone is shown. It is a timing chart of the driving | operation control of the refrigerator of FIG. 1, Comprising: The case where outside temperature is a low temperature zone is shown. It is a figure which shows the refrigerating cycle of the refrigerator concerning the 2nd Embodiment of this invention.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a refrigerator 1 according to the present embodiment is formed by forming a storage space inside a heat insulation box, and a freezing room or a freezing storage room 2 of an ice making room, a refrigeration room by a partition wall. And a plurality of storage rooms such as a refrigerated storage room 3 in a vegetable room.

  At the rear of the storage space, a freezing evaporator 4 for cooling the frozen storage room 2, a freezing fan 6 for circulating the cold air in the frozen storage room 2, and a refrigeration for cooling the refrigerated storage room 3. A refrigeration fan 7 for circulating the cool air in the refrigeration storage chamber 3 and the evaporator 5 is provided.

  Each storage room is cooled and held at a predetermined set temperature by the refrigeration evaporator 4, the refrigeration evaporator 5, and the refrigeration or refrigeration fans 6 and 7, respectively. It is cooled by the refrigerant supplied from the compressor 9 installed in the machine room 8 at the lower back of the refrigerator main body.

  As shown in FIG. 2, the refrigeration cycle of the refrigerator 1 includes a compressor 9 that discharges high-temperature and high-pressure refrigerant gas, a condenser 10 that receives the refrigerant gas discharged from the compressor 9 and liquefies heat, and the condensation A switching valve 11 provided on the outlet side of the vessel 10 for switching the refrigerant flow path, the refrigeration evaporator 4 and the refrigeration evaporator 5, and a refrigeration decompression device as a throttle means for the evaporators 4, 5. 12 and the decompression device 13 for refrigeration, and the check valve 14 are connected by piping.

  Specifically, the compressor 9, the condenser 10, and the switching valve 11 are connected in series, and one outlet of the switching valve 11, the refrigeration decompression device 12, the refrigeration evaporator 4, and the check valve 14 are connected in series. The other outlet of the switching valve 11, the refrigeration decompression device 13, and the refrigeration evaporator 5 are connected in series.

  Then, the refrigerant circuit is configured by joining the pipe connected to the outlet side of the check valve 14 and the pipe connected to the outlet side of the refrigeration evaporator 5 and returning the suction pipe 15 to the compressor 9. Yes. Accordingly, the low-temperature side refrigeration evaporator 4 connected from the switching valve 11 via the refrigeration decompression device 12 and the high-temperature side refrigeration evaporator 5 connected from the switching valve 11 via the refrigeration decompression device 13. Are connected in parallel.

  The switching valve 11 switches the flow path so that the refrigerant liquefied by the condenser 10 is supplied to the refrigeration evaporator 4 and the refrigeration evaporator 5 alternately or simultaneously. A three-way valve with a flow restrictor function that functions as an expansion valve that can control the flow rate as well as switching the path is used.

  Capillary tubes are used as the refrigeration decompression device 12 and the refrigeration decompression device 13, and the refrigeration decompression device 12 is tighter than the refrigeration decompression device 13, that is, has a larger flow resistance. The refrigerant flowing from the switching valve 11 is depressurized by the decompressors 12 and 13 and then evaporated by the evaporators 4 and 5 to lower the temperature of the evaporators 4 and 5. 15 to return to the compressor 9.

  The machine room 8 is formed in the lower part of the back surface of the refrigerator 1, the compressor 9 is disposed close to one side in the width direction, and the heat radiating fan 16 and the condenser 10 are disposed on the other side in the width direction. ing. The heat radiating fan 16 takes outside air into the machine room 8 and blows it to the condenser 10 and the compressor 9 to cool them.

  Further, in the refrigerator 1, a freezer temperature sensor 20 that measures the internal temperature of the freezer storage room 2 is provided on the ceiling surface of the freezer storage room 2, and the cold storage room 3 has a duct that sends cold air to the cold storage room. A temperature sensor 21 for the refrigerator compartment that measures the internal temperature is provided, and an outside temperature sensor 22 that detects the temperature (external temperature) of the installation atmosphere of the refrigerator 1 at the door that closes the front of the refrigerator compartment 3 so as to be openable and closable. Is provided.

  And in the refrigerator 1, based on the detection temperature of various temperature sensors, such as the temperature sensor 20 for freezer compartments, the temperature sensor 21 for refrigerator compartments, and the temperature sensor 22 outside a store | warehouse | chamber, the compressor 9 and the switching valve 11 are not shown by the control means not shown. Further, by controlling the heat radiating fan 16, a cooling operation is performed in which the four cooling modes of the refrigeration cooling mode, the refrigeration cooling mode, the simultaneous cooling mode, and the stop mode are switched.

  In the refrigeration cooling mode, the refrigeration evaporator 4 side of the switching valve 11 is fully opened and the refrigeration evaporator 5 side is fully closed, and only the refrigeration storage chamber 2 is cooled by flowing a refrigerant through the refrigeration evaporator 4, and refrigeration cooling is performed. In the mode, the refrigeration evaporator 4 side of the switching valve 11 is fully closed and the refrigeration evaporator 5 side is fully opened, and only the refrigeration storage chamber 3 is cooled by flowing a refrigerant through the refrigeration evaporator 5.

  In the simultaneous cooling mode, the refrigeration evaporator 4 side of the switching valve 11 is fully opened, and the opening degree on the refrigeration evaporator 5 side is opened smaller than the fully opened state so as to reduce the refrigerant flow rate to the refrigeration evaporator 5. The refrigeration storage chamber 2 and the refrigeration storage chamber 3 are simultaneously cooled by flowing a refrigerant through both the refrigeration evaporator 4 and the refrigeration evaporator 5. In the stop mode, the compressor 9 is stopped and the refrigeration evaporator 4 side and the refrigeration evaporator 5 side of the switching valve 11 are both closed to supply the refrigerant to the refrigeration evaporator 4 and the refrigeration evaporator 5. Shut off and stop cooling of the freezer storage room 2 and the refrigerated storage room 3.

  In the present embodiment, the refrigeration cooling mode and the simultaneous cooling mode will be described separately, but since the refrigerant flows through the refrigeration evaporator 5 in any mode, the simultaneous cooling mode is also an aspect of the refrigeration cooling mode. included.

  As an example, the cooling operation of the refrigerator 1 of the present embodiment includes a refrigeration cooling mode, a simultaneous cooling mode, a refrigeration cooling mode, a stop mode, a refrigeration cooling mode, a stop mode, a simultaneous cooling mode, as shown in FIGS. The refrigeration cooling mode and the refrigeration cooling mode are executed in this order.

  At that time, during the execution of the refrigeration cooling mode and the simultaneous cooling mode, the heat radiating fan 16 is rotated at a predetermined rotational speed to promote heat dissipation of the condenser 10 and the compressor 9 (time A and time B in FIGS. 3 to 5). , Time G and time H), during execution of the stop mode, the heat dissipation fan 16 is stopped (see time D and time F in FIGS. 3 to 5).

  During the execution of the refrigeration cooling mode, the operation of the heat radiating fan 16 is controlled based on the type of the cooling mode immediately before the refrigeration cooling mode and the detected temperature Ts of the outside temperature sensor.

  Specifically, the detected temperature Ts of the outside temperature sensor 22 is lower than the first predetermined temperature T1 (for example, T1 = 17 ° C.) and higher than the second predetermined temperature T2 (for example, T2 = 10 ° C.). When in the temperature zone, as shown in FIG. 3, the cooling mode immediately before the refrigeration cooling mode is the simultaneous cooling mode or the refrigeration cooling mode, that is, in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode. Then, the first control for promoting the heat radiation of the condenser 10 and the compressor 9 by rotating the heat radiating fan 16 at a predetermined rotational speed Nr is executed (see time C and time I in FIG. 3).

  On the other hand, when the cooling mode immediately before the refrigeration cooling mode is the stop mode, that is, in the refrigeration cooling mode switched from the stop mode, the heat radiating fan 16 is stopped without being rotated and compared with the first control by the heat radiating fan 16. 2nd control which reduces the thermal radiation capability of the condenser 10 is performed (refer time E of FIG. 3). In the present embodiment, in the refrigeration cooling mode switched from the stop mode, the radiating fan 16 is stopped as the second control. However, the radiating fan 16 is rotated at a rotational speed lower than the predetermined rotational speed Nr to rotate the first radiating fan 16. Compared to the control, the heat dissipation capability of the condenser 10 by the heat dissipation fan 16 may be reduced.

  When the detected temperature Ts of the outside temperature sensor 22 is in a high temperature zone higher than the first predetermined temperature T1, as shown in FIG. 4, in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode, as described above. The first control is executed (see time C and time I in FIG. 4). In the refrigeration cooling mode switched from the stop mode, the first control is performed by rotating the heat dissipating fan 16 at a predetermined rotational speed Nr without executing the above-described second control for reducing the heat dissipating ability of the condenser 10 by the heat dissipating fan 16. The same control is executed (see time E in FIG. 4).

  As shown in FIG. 5, when the detected temperature Ts of the outside temperature sensor 22 is in a low temperature zone equal to or lower than the second predetermined temperature T2, in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode, as described above, Without executing the first control, the heat dissipation fan 16 is stopped and the same control as the second control described above is executed (see time C and time I in FIG. 5). In the refrigeration cooling mode switched from the stop mode, the heat dissipation fan 16 is stopped and the second control is executed (see time E in FIG. 5).

  As described above, in the refrigerator 1 of the present embodiment, when the outside temperature Ts is in the middle temperature range (T2 <Ts ≦ T1) from the second predetermined temperature T2 to the first predetermined temperature T1, the refrigeration evaporator 5 has In the refrigerating cooling mode switched from the simultaneous cooling mode in which the refrigerant flows or the refrigeration cooling mode, the first control is performed to rotate the heat dissipation fan 16 at a predetermined rotation speed Nr, and the heat dissipation fan 16 is switched in the refrigerating cooling mode switched from the stop mode. The second control is executed to stop and reduce the heat radiation capability of the condenser 10 by the heat radiation fan 16 compared to the first control.

  Thereby, in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode, the cooling fan 16 can lower the temperature of the compressor 9 or the condenser 10 to improve the cooling efficiency of the refrigerator 1.

  In addition, since the stagnation phenomenon in which the refrigerant in the refrigeration cycle stays in the condenser 10 is likely to occur immediately after the start of the compressor 9, the refrigerant supplied to the refrigeration evaporator 4 in the refrigeration cooling mode switched from the stop mode. In this embodiment, the amount of refrigerant that stays in the condenser 10 is reduced early by executing the second control that lowers the heat dissipation capability of the condenser 10 by the heat dissipation fan 16. It can be circulated in the refrigeration cycle, and the cooling efficiency can be improved. That is, when the outside temperature Ts is in the intermediate temperature range, in the refrigeration cooling mode switched from the stop mode, the second control is performed by improving the cooling efficiency by increasing the heat radiation performance of the heat radiating fan 16 and lowering the refrigerant condensing temperature. The cooling efficiency can be improved by giving priority to the elimination of the refrigerant stagnation and eliminating the superheat state at an early stage.

  Further, in the refrigerator 1 of the present embodiment, when the outside temperature Ts is a high temperature zone (Ts> T1) higher than the first predetermined temperature T1, in the refrigeration cooling mode switched from the stop mode, the condensation by the heat radiating fan 16 The same control as the first control is executed without executing the second control for reducing the heat dissipation capability of the vessel 10. Even if the compressor 9 to be stopped is just started, if the outside temperature is high, the refrigerant is less likely to stay in the condenser 10 and easily circulates in the refrigeration cycle. However, the cooling efficiency of the refrigerator 1 can be improved by increasing the heat dissipation performance of the heat dissipation fan 16 and lowering the condensation temperature of the refrigerant without executing the second control.

  Further, in the refrigerator 1 of the present embodiment, when the outside temperature Ts is a low temperature zone (Ts ≦ T2) equal to or lower than the second predetermined temperature T2, in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode, The first control is not executed, and the control for reducing the heat dissipation capability of the condenser 10 by the heat dissipation fan 16 as in the second control is executed.

  Since the refrigerant tends to stay in the condenser 10 when the outside temperature is low, the amount of refrigerant supplied to the refrigeration evaporator 4 is insufficient even in the refrigeration cooling mode switched from the simultaneous cooling mode or the refrigeration cooling mode. However, in the refrigerator 1 of the present embodiment, the second control is performed to improve the cooling efficiency by increasing the heat dissipation performance of the heat dissipation fan 16 and lowering the refrigerant condensing temperature. Cooling efficiency can be improved by prioritizing the elimination of the phenomenon and eliminating the superheat state at an early stage.

  In the present embodiment, the operation of the heat dissipation fan 16 in the refrigeration cooling mode is controlled based on the type of the cooling mode immediately before the refrigeration cooling mode and the detected temperature Ts of the outside temperature sensor. Regardless of the detected temperature Ts, depending on the type of the cooling mode immediately before the refrigeration cooling mode, that is, in the refrigeration cooling mode switched from the refrigeration cooling mode or the simultaneous cooling mode, the first control is executed and the refrigeration cooling switched from the stop mode. The second control may be executed in the mode, and in such a case, the heat dissipation fan can be operated according to the state of the refrigerant in the refrigeration cycle with a simple control configuration, and the cooling efficiency is improved. Can do.

(Second Embodiment)
In the second embodiment, the operation of the radiating fan 16 in the refrigeration cooling mode is performed based on the type of the cooling mode immediately before the refrigeration cooling mode and the temperature detected by the temperature sensors 23 and 24 provided in the refrigeration evaporator 4. Control.

  Specifically, as shown in FIG. 6, the refrigeration evaporator 4 includes an inlet temperature sensor 23 that detects the temperature on the refrigerant inlet side of the refrigeration evaporator 4, and the temperature on the refrigerant outlet side of the refrigeration evaporator 4. And an outlet temperature sensor 24 for detecting.

  In the refrigeration cooling mode switched from the stop mode, if the difference between the detected temperature Ti of the inlet temperature sensor 23 and the detected temperature To of the outlet temperature sensor 24 is larger than a predetermined value, the radiating fan 16 is stopped and the first control is performed. The second control for reducing the heat dissipation capability of the condenser 10 by the heat radiating fan 16 is executed as compared with the above, but if the difference between the detected temperature Ti and the detected temperature To is less than or equal to a predetermined value, Without executing the second control for reducing the heat dissipation capability, the control similar to the first control is executed by rotating the heat dissipation fan 16 at a predetermined rotational speed Nr.

  In the refrigerator 1 of this embodiment, when the temperature at the refrigerant inlet side and the refrigerant outlet side of the refrigeration evaporator 4 is large in the refrigeration cooling mode, the amount of refrigerant supplied to the refrigeration evaporator 4 is insufficient. Therefore, in the refrigerator 1 of the present embodiment, the second control is executed to improve the cooling efficiency by increasing the heat dissipation performance of the radiating fan 16 and lowering the refrigerant condensing temperature. Cooling efficiency can be increased by prioritizing the elimination of the stagnation phenomenon and eliminating the superheat state at an early stage. Other configurations and operational effects are the same as those of the first embodiment, and detailed description thereof is omitted.

  The above-described embodiments are presented as examples, and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments are included in the scope and gist of the invention, and are also included in the invention described in the scope of claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator 2 ... Refrigeration storage room 3 ... Refrigeration storage room 4 ... Refrigeration evaporator 5 ... Refrigeration evaporator 6 ... Refrigeration fan 7 ... Refrigeration fan 8 ... Machine room 9 ... Compressor 10 ... Condenser 11 ... Switching Valve 12 ... Refrigeration decompression device 13 ... Refrigeration decompression device 14 ... Check valve 15 ... Suction pipe 16 ... Radiation fan 20 ... Freezer compartment temperature sensor 21 ... Refrigeration compartment temperature sensor 22 ... Outside temperature sensor 23 ... Inlet temperature Sensor 24 ... Outlet temperature sensor

Claims (4)

Compressor, condenser, refrigeration evaporator for cooling the refrigerated storage room, refrigeration evaporator for cooling the refrigerated storage room, and switching to flow refrigerant to the refrigeration evaporator and the refrigeration evaporator A valve and a heat dissipating fan for cooling the condenser;
Refrigeration cooling mode in which a refrigerant flows through the refrigeration evaporator, a refrigeration cooling mode in which a refrigerant flows through the refrigeration evaporator, and supply of the refrigerant to the refrigeration evaporator and the refrigeration evaporator by stopping the compressor In the refrigerator that executes by switching between the stop mode to stop
In the refrigeration cooling mode switched from the refrigeration cooling mode, the first control is performed to rotate the heat dissipation fan at a predetermined number of revolutions, and in the refrigeration cooling mode switched from the stop mode, the heat dissipation fan is stopped, or A refrigerator that performs second control to rotate the heat dissipation fan at a lower rotational speed than the predetermined rotational speed. It is equipped with an outside temperature sensor that detects the temperature of the refrigerator installation atmosphere.
When the temperature detected by the outside temperature sensor is higher than a first predetermined temperature, the second fan is not executed in the refrigeration cooling mode switched from the stop mode, and the heat radiating fan is rotated at the predetermined rotational speed,
2. The refrigerator according to claim 1, wherein when the temperature detected by the outside temperature sensor is equal to or lower than a first predetermined temperature, the second control is executed in the refrigeration cooling mode switched from the stop mode. It is equipped with an outside temperature sensor that detects the temperature of the refrigerator installation atmosphere.
When the temperature detected by the outside temperature sensor is higher than a second predetermined temperature, the first control is executed in the refrigeration cooling mode switched from the refrigeration cooling mode,
When the temperature detected by the outside temperature sensor is equal to or lower than a second predetermined temperature, the first control is not performed in the refrigeration cooling mode switched from the refrigeration cooling mode, and the radiating fan is stopped, or the predetermined temperature The refrigerator according to claim 1 or 2, wherein the heat radiating fan is rotated at a rotational speed lower than the rotational speed. An inlet temperature sensor that detects the temperature of the refrigerant inlet side of the refrigeration evaporator, and an outlet temperature sensor that detects the temperature of the refrigerant outlet side of the refrigeration evaporator,
When the difference between the detected temperature of the inlet temperature sensor and the detected temperature of the outlet temperature sensor is greater than a predetermined value, the second control is executed in the refrigeration cooling mode switched from the stop mode,
When the difference between the detected temperature of the inlet temperature sensor and the detected temperature of the outlet temperature sensor is equal to or smaller than a predetermined value, the second control is not performed in the refrigeration cooling mode switched from the stop mode, and the heat dissipation fan is The refrigerator according to claim 1, wherein the refrigerator is stopped or the heat radiating fan is rotated at a rotation speed lower than the predetermined rotation speed.

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