JP2006090663A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator capable of preventing dew condensation in a cabinet even if using a quick freezing mode. <P>SOLUTION: This refrigerator is provided with the cabinet 2 with a freezing storage chamber 6 disposed, and a variable speed type compressor 41 for allowing a refrigerant to flow to a refrigerating cycle 40 connecting a condenser 42 to a cooler 48 embedded in the cabinet 2 to cool the freezing storage chamber 6 and an antisweating pipe 43 embedded in the cabinet 2 to prevent dew condensation on an external wall. After the completion (te) of the quick freezing mode operation of operating the compressor 41 by high speed rotation to quickly cool the freezing storage chamber 6, operation is shifted to an antisweating mode of operating the compressor 41 by low speed rotation (tf-tg). <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerator having a quick freezing mode for rapidly cooling a freezing room.

Conventionally, when you want to freeze food quickly or to make ice quickly, you can turn on the quick freezing switch on the door surface to turn on the compressor and the fan in the refrigerator more than usual. Refrigerators equipped with a quick freezing mode for rapidly cooling the specification switching room (freezing storage room) when the number of rotations is increased and the freezing room, ice making room or freezing temperature zone is set are on the market (For example, patent document 1).
JP 2004-3867 A

  However, in recent years, due to the improvement of the freezing capacity, if the quick freezing mode is used, the freezer compartment is cooled to a low temperature, for example, about −30 to −40 ° C., so that dew condensation on the outer wall of the cabinet due to the temperature difference from the outside temperature. May occur. In this case, if the compressor is in operation, the high-temperature refrigerant flows through the dew-proof pipe embedded in the outer wall, and the outer wall becomes a high temperature, for example, 20 ° C. or higher, so that the occurrence of condensation can be prevented. . However, after the quick refrigeration mode is completed, the operation proceeds to a normal cooling operation, and the compressor is stopped until it reaches the ON temperature of the compressor, for example, -18 ° C. It takes a long time for the room temperature to reach the ON temperature of the compressor after cooling to about ℃, and the outer wall of the cabinet becomes low temperature, for example, less than 20 ℃ due to heat leakage from the room, thus avoiding the occurrence of condensation It was something that could not be done.

  The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a refrigerator capable of preventing condensation of a cabinet even when a quick freezing mode is used.

  In order to solve the above problems, a refrigerator according to the present invention includes a cabinet provided with a freezer storage chamber, a condenser, a dew-proof pipe embedded in the cabinet to prevent dew condensation on the outer wall, and cooling for cooling the freezer storage chamber. A variable speed compressor for flowing a refrigerant in a refrigeration cycle connected to a refrigerator, and after the quick refrigeration mode operation for rapidly cooling the refrigeration storage chamber by operating the compressor at a high speed rotation, It is characterized by shifting to a condensation prevention mode in which the compressor is operated at a low speed.

  According to the above invention, even if the refrigeration storage room is in a low temperature state after the operation of the quick freezing mode, the outer wall of the cabinet is warmed by flowing the high-temperature refrigerant through the dew-proof pipe by forcibly rotating the compressor. The occurrence of condensation can be prevented, and unnecessary power consumption can be suppressed because rotation is performed at a low speed.

  An embodiment of the present invention will be described. As shown in FIG. 2 which is a longitudinal sectional view of the refrigerator according to the present invention, the refrigerator main body 1 is a refrigerated storage room in order from the top in a cabinet 2 filled with a heat insulating material between an outer box and an inner box. The refrigeration room 3, the vegetable room 4, the freezing room 6 that is a freezing storage room, and the specification switching room 5 that becomes a freezing storage room when the set temperature is changed to the -freezing temperature zone are configured. Although not particularly shown, an ice making room which is a freezing storage room is provided on the side of the specification switching room 5. The front opening of the main body 1 is provided with doors 7 to 10 that sequentially close the storage chambers 3 to 6 in an openable manner.

  The refrigerator compartment 3 and the vegetable compartment 4 are partitioned by a partition plate 11, and each of the refrigerator compartment 3 and the vegetable compartment 4 is approximately 1 to 5 based on the temperature detected by a refrigeration temperature sensor 54 (hereinafter referred to as R sensor) attached to the back of the refrigerator compartment 3. In the temperature range. A refrigeration cooler 46 (hereinafter referred to as “R EVA”) is provided on the back surface of the refrigerator compartment 3, and a refrigeration fan 18 (hereinafter referred to as “R fan”) is provided above the refrigerator. When the R fan 18 is rotated, the cold air generated by the R EVA 44 is supplied to the refrigerating room 3 to cool the room, and the vegetable room 4 is cooled, and the cooled air is returned to the R EVA 46 again. To be cooled.

  On the other hand, the specification switching chamber 5, the freezing chamber 6 and the ice making chamber are partitioned by a heat insulating partition wall 16, and the freezing chamber 6 is detected by a freezing temperature sensor 55 (hereinafter referred to as F sensor). Therefore, the specification switching chamber 5 is controlled to be held in various set temperature zones. On the back surfaces of the specification switching chamber 5 and the freezer compartment 6, there is provided a freezer compartment evaporator 48 (hereinafter referred to as "F EVA") whose evaporation temperature is set lower than that of the R evaporator 46, and in the upper part thereof, a freezer compartment fan. 19 (hereinafter referred to as F fan) is provided. When the F fan 19 is operated, the cold air generated by the F EVA 48 is supplied to the specification switching chamber 5 and the ice making chamber or the freezer compartment 6 to cool the chambers. It is supposed to be cooled by. Further, the F eva 48 is provided with a defrost heater 20 including a pipe heater that performs defrost.

  The vegetable room 4, the specification switching room 5 and the ice making room are partitioned by a heat insulating partition wall 17, and the refrigeration room 3 and vegetable room 4, the specification switching room 5, the ice making room and the freezing room 6 are respectively cooled. The flow is made independent.

  A machine room 30 is provided at the bottom of the back surface of the main body 1, a variable speed compressor 41, a condenser 42, a heat dissipating fan 31 (hereinafter referred to as C fan) that radiates these, and an outside air temperature are detected. An outside air temperature sensor 53 is provided. A control device 50 is provided on the back of the machine room 30 to supply power to each electrical component and control it based on the detected temperatures of the outside air temperature sensor 53, the R sensor 54, the F sensor 55, and the like.

  An operation panel 13 is arranged at the lower front of the refrigerator compartment door 7. An input signal is output to the control device 50 by a pressing operation on the operation panel 13, and quick freezing is put into a quick freezing mode to be described later. A switch 14 is provided.

The refrigeration cycle 40 according to the present invention includes a condenser 42 that condenses refrigerant on the discharge side of the compressor 41, an outer wall of the cabinet 2, here, a back surface, a side surface, a front surface, and a refrigerating cycle 40 according to the present invention, as shown in FIG. A dew proof pipe 43 that is buried over the front surfaces of the partition plate 11 and the heat insulating partition walls 16 and 17 and prevents condensation on the outer wall is disposed. A switching valve 44, which is a flow rate or flow path adjustment / switching device, is connected to the downstream side of the dew-proof pipe 43, and a freezing capillary tube 47 (hereinafter referred to as a refrigeration capillary tube 47) is connected to one outlet side of the switching valve 44. F
A tube connecting the F evaporator 48 and the accumulator 49 in order, and the other connecting a tube connecting the second capillary tube 44 (hereinafter referred to as the R capillary tube) and the R evaporator 46. ing. The outlet side pipe of the R evaporator is connected to the inlet side of the F evaporator 48, and the outlet side pipe of the accumulator 49 is connected to the suction side of the compressor 41.

  The outlet piping of the R evaporator 46 is provided with a refrigeration defrost sensor 51 (hereinafter referred to as RD sensor) for detecting the piping temperature of the R evaporator 46, and the accumulator 49 has an outlet piping temperature of the F evaporator 48. Is provided with a defrosting sensor 52 for refrigeration (hereinafter referred to as FD sensor).

  Here, the normal cooling mode will be described. In the normal cooling mode, the R cooling mode and the F cooling mode are alternately switched to cool each chamber. In the R cooling mode, the detected temperature of the R sensor 54 is the ON temperature of the compressor 41, for example, 5 When the temperature rises to 0 ° C., the refrigerating room 3 and the vegetable room 4 are cooled by operating the switching valve 44 so that the refrigerant flows to the R EVA 46 side. On the other hand, in the F cooling mode, when the detected temperature of the F sensor 55 reaches the ON temperature of the compressor 41, for example, −18 ° C., the switching valve 44 is operated so that the refrigerant flows to the F EVA 48 side and the freezer compartment 6 and the like. Cool down. In addition, since it is necessary to cool the storage room being cooled to a minimum, even if the storage room that has not been cooled reaches the ON temperature, it may be in the F cooling mode for a predetermined time, for example, 20 minutes in the R cooling mode. For example, the cooling mode is not switched for 40 minutes.

  Specifically, in the R cooling mode, the R fan 18 is rotated to supply cold air to the refrigerator compartment 3, and the F fan 19 is stopped. In the F cooling mode, the F fan 19 is rotated to supply cold air to the freezer compartment 6 and the like, and the R fan 18 defrosts the R evaporator 44 so that the detected temperature of the RD sensor 51 becomes a predetermined temperature, for example, 3 ° C. Rotate until it reaches. In this way, the refrigeration chamber 3, the vegetable chamber 4, the switching chamber 5, the ice making chamber, and the freezing chamber 6 are maintained at appropriate temperatures by sequentially switching the R cooling mode and the F cooling mode alternately.

  In the compressor 41, the rotation frequency is determined based on the temperature difference between the set temperature of each chamber and the temperature detected by the R sensor 54 or the F sensor 55, and the storage chamber being cooled is set to the OFF temperature. If the storage room that has not reached cooling has reached the ON temperature, the rotation is stopped. The C fan 31 varies in rotation speed in synchronization with the rotation speed of the compressor 41, and stops when the compressor 41 stops.

  Next, the defrosting mode of F EVA 48 will be described. In the defrosting mode, a predetermined cooling operation cycle that considers that the cooling performance is deteriorated due to the frost formation of the F EVA 48, for example, the accumulated operation time of the compressor 41 has elapsed for 8 hours, and the F cooling mode ends. At this point, the normal cooling mode is entered. Immediately before the transition to the defrosting mode, in order to suppress the temperature rise of the freezer compartment 6 due to the defrosting, the end set temperature of the F cooling mode is lowered stepwise to force the freezer compartment 6 etc. Perform pre-cooling operation to cool down.

  After shifting to the defrost mode, the defrost heater 20 is energized to perform defrosting. When the detected temperature of the FD sensor 52 reaches the defrost end temperature, for example, 10 ° C., the defrost heater 20 is deenergized. To cancel the defrost mode. Then, for the pressure balance of the refrigeration cycle, the compressor 41 is stopped until a predetermined time, for example, 6 minutes elapses, and a normal cooling mode is shifted.

  Next, the quick freezing mode will be described with reference to FIG. When the quick freezing switch 14 is operated, the quick freezing mode shifts immediately if it is in the normal cooling mode at the timing t0, and shifts after the defrosting mode ends if the defrosting mode or precooling operation is in progress. To do.

  In the quick freezing mode, in order to rapidly cool the food stored in the freezer compartment 6 or the like, the mode is changed to the F cooling mode, and the compressor 41 is rotated at a high speed, for example, the rotation frequency is 63 Hz regardless of the temperature in the storage compartment. Let it run. At this time, the F fan 19 and the C fan 31 are also rotated at a high speed, thereby increasing the supply of cool air and enhancing the heat dissipation effect to perform rapid cooling.

  During this cooling, if the room temperature of the refrigerator compartment 3 reaches the ON temperature, the refrigerator compartment 3 and the vegetable compartment 4 will become hot if the refrigerator storage room is continuously cooled. When the timing shifts to the R cooling mode to cool the refrigerated storage chamber and the storage chamber temperature reaches the OFF temperature, the timing shifts to the F cooling mode again at the timing of tb. In addition, even if it transfers to R cooling mode, the compressor 41 is made to drive | operate by high speed rotation, The temperature in a storage chamber is rapidly reached to OFF temperature, and is made to transfer to F cooling mode.

  The quick freezing mode is a preset time from the time of transition to this mode, for example, 120 minutes, or when a time set by the user has elapsed, or a temperature at which the room temperature of the freezer compartment 6 is preset, For example, when the temperature reaches −30 ° C., it is assumed that the room has been sufficiently rapidly cooled, and the operation is terminated.

  Next, the dew condensation prevention mode which is one embodiment of the present invention will be described. The dew condensation prevention mode consists of a first predetermined time and a second predetermined time, and is shifted to the timing of tc when the quick freezing mode is finished. In the first predetermined time, in this embodiment, 20 minutes The same control as in the cooling mode is performed.

  In general, even if the normal cooling mode is performed, after the quick freezing mode is finished, if the room temperature of the refrigerator compartment 3 has not reached the ON temperature, the freezer compartment 6 is below the OFF temperature. It is in a stopped state. For this reason, the temperature of the outer wall of the cabinet 2 is a dew temperature measured from an experiment or the like, here, it may drop to 20 ° C. or less due to heat leakage, and condensation may occur. Is executed.

In this case, unlike the normal F cooling mode, the compressor 41 is operated at a low speed, for example, a rotation frequency of 30 Hz.
After completion of the quick freezing mode operation, the refrigeration storage room is sufficiently cooled, so there is no need for further cooling. Therefore, the outer wall of the cabinet 2 is not heated, but is cooled by heat leakage and condensation occurs. Therefore, by forcibly rotating the compressor 41 and causing the refrigerant gas to flow through the dew prevention pipe 43, the cabinet 2 can be heated to prevent the occurrence of condensation. Moreover, useless supercooling can be prevented by rotating at a low speed, thereby saving power. Furthermore, by setting it to F cooling mode, even if it becomes supercooling, unlike the refrigerator compartment 3 and the vegetable compartment 4, a foodstuff does not freeze and a malfunction does not generate | occur | produce.

  Although the first predetermined time has not elapsed after completion of the quick freezing mode, the compressor 41 may be rotated at a low speed as described above to prevent condensation, but the outer wall of the cabinet 2 is in the quick freezing mode. Therefore, even if the compressor 41 is stopped, it takes some time for the outer wall temperature to decrease to the dew temperature. Therefore, by setting the first predetermined time shorter than the time until the outer wall temperature of the cabinet 2 measured from the experiment reaches the dew temperature, it is possible to surely prevent dew condensation and to prevent the first predetermined time. By not performing forced rotation of the compressor 41 at low speed, unnecessary cooling can be prevented and power saving can be achieved.

  On the other hand, the C fan 31 is stopped during the condensation prevention mode. As usual, when rotating in synchronization with the compressor 41, the condenser 42 and the compressor 41 are dissipated, so the temperature of the refrigerant gas flowing in the dew-proof pipe 43 decreases, and the outer wall of the cabinet 2 This is counterproductive for the purpose of heating. Therefore, by stopping the C fan 31, higher-temperature refrigerant gas can be caused to flow through the dew-proof pipe 43, and the occurrence of condensation can be prevented more reliably and effectively.

  Now, the dew condensation prevention mode is canceled at the timing te when the second predetermined time has elapsed from the timing td when the mode is forcibly shifted to the F cooling mode, and the mode is shifted to the normal cooling mode. This second predetermined time is a time measured by experiment or the like that does not drop below the dew temperature even when the compressor 41 is stopped, based on the relationship between the temperature rise in the freezer storage room and the temperature in the cabinet 2. Then it is 10 minutes.

  Accordingly, by releasing the dew condensation prevention mode after the second predetermined time has elapsed, it is possible to reliably prevent dew condensation, and if the compressor 41 is operated continuously at low speed, Even if the room temperature reaches the ON temperature, it is possible to prevent the problem that the room temperature is not cooled, and the subsequent cooling can be performed effectively.

  Next, another embodiment will be described with reference to FIG. In the present embodiment, when the room temperature of the refrigerator compartment 3 reaches the ON temperature during the dew condensation prevention mode shifted at the timing of tf, the mode shifts to the R cooling mode at the timing of tg. This is because the compressor 41 rotates and cools the refrigerating chamber 3 and the like without forcibly shifting to the F cooling mode, so that the dew-proof pipe 43 has a high-temperature refrigerant. This is because gas can flow and condensation can be prevented. In this case, since it changes to R cooling mode rapidly according to the request | requirement of cooling of the refrigerator compartment 3, it can also prevent that the refrigerator compartment 3 and the vegetable compartment 4 become high temperature.

  Further, when the mode is changed to the R cooling mode and the room temperature of the refrigerator compartment 3 reaches the OFF temperature, the mode is changed to the dew condensation prevention mode at the timing of th within the first predetermined time and the second predetermined time. ing. This is because the compressor 41 is not operated unless the freezer compartment 6 has reached the ON temperature even when the R cooling mode is finished and the F cooling mode is shifted to within the first predetermined time and the second predetermined time. This is because the outer wall temperature of the cabinet 2 may fall below the dew temperature.

  Therefore, by shifting to the dew condensation prevention mode as described above, the compressor 41 can be operated in a time zone in which dew condensation may occur even if the operation time of the R cooling mode is short. Condensation can be prevented from occurring.

  Next, still another embodiment will be described. In the present embodiment, the first predetermined time or the second predetermined time is changed based on the temperature of the freezer compartment at the end of the operation in the quick freezing mode. In the embodiment in which the quick freezing mode is ended when the set time has elapsed, the room temperature at the end of the quick freezing mode may be significantly different depending on the load of the food, and when the room temperature is high, the first predetermined time or Even if the second predetermined time has not elapsed, the temperature difference from the outside air temperature is small, and no condensation occurs. Therefore, in the present embodiment, when the temperature of the freezer storage chamber is high at the end of the operation in the quick freezing mode, the first predetermined time or the second predetermined time is shortened to, for example, 15 minutes or 5 minutes, Condensation can be reliably prevented, and the normal cooling mode can be promptly shifted. Of course, when the temperature of the storage room is low, the first predetermined time or the second predetermined time may be extended.

  The above-described configuration is an embodiment of the present invention, and various changes can be made. The refrigeration cycle 40 is not limited to the configuration described in the present embodiment, but a so-called parallel cycle in which an R EVA 46 and an F EVA 48 are connected in parallel, a cycle using a two-stage compressor, or a single cooler. It may be a one-evaporation cycle for cooling the refrigerator compartment 3 or the freezer compartment 6. Further, the first predetermined time, the second predetermined time, the rotational speed of the compressor, the dew temperature, etc. are preferably changed as appropriate according to the form of the refrigerator, and also changed appropriately in relation to the outside air temperature. Is preferred.

  The present invention can be applied to various refrigerators equipped with a quick freezing mode.

It is a time chart which shows one Embodiment of this invention. It is a time chart which shows other embodiment of this invention. It is a longitudinal cross-sectional view which shows the refrigerator of this invention. It is the schematic which shows the refrigerating cycle of the refrigerator of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Refrigerator main body 3 ... Refrigeration room 6 ... Freezing room 14 ... Rapid freezing switch 31 ... C fan 41 ... Compressor 42 ... Condenser 43 ... Dew prevention pipe 44 ... Switching valve 46 ... R EVA 48 ... F Eva 50 ... Control device

Claims (8)

  A variable-speed type in which a refrigerant flows through a refrigeration cycle in which a cabinet having a freezer storage chamber, a condenser, a dew-proof pipe embedded in the cabinet to prevent dew condensation on the outer wall, and a cooler for cooling the freezer storage chamber are connected. After the end of the quick refrigeration mode operation in which the compressor is operated at a high speed rotation and the refrigeration storage chamber is rapidly cooled, a dew condensation prevention mode in which the compressor is operated at a low speed rotation is entered. A refrigerator characterized by that.   A refrigerated storage room and a refrigerated storage room cabinet, a condenser, a dew-proof pipe embedded in the cabinet to prevent dew condensation on the outer wall, and the refrigerated storage room and the refrigerated storage room for independent cooling. And a refrigerating cooler and a variable speed compressor for flowing the refrigerant through a refrigerating cycle in which a flow rate of refrigerant flowing through these coolers or a switching valve for changing the flow path is connected to the refrigerating cooler side. After the quick refrigeration mode operation in which the switching valve is operated so that the refrigerant flows and the compressor is operated at a high speed rotation to rapidly cool the refrigeration storage chamber, the switching valve is not operated and the compressor is operated. When the refrigerated storage chamber becomes higher than the ON temperature of the compressor during the dew condensation prevention mode, the mode is canceled and the refrigerant enters the refrigeration cooler side. Refrigerator, characterized in that to operate the switching valve to flow.   The refrigerator according to claim 1 or 2, wherein the dew condensation prevention mode shifts when the first predetermined time or more has elapsed after the end of the operation in the quick freezing mode.   The refrigerator according to any one of claims 1 to 3, wherein a heat dissipating fan for dissipating heat from the condenser and the compressor is provided, and the heat dissipating fan is stopped in the dew condensation prevention mode.   The refrigerator according to claim 3, wherein the dew condensation prevention mode is canceled when the second predetermined time or more has elapsed.   When the refrigeration chamber becomes higher than the compressor ON temperature during the dew condensation prevention mode, when the refrigeration storage chamber is cooled within the second predetermined time and becomes lower than the compressor OFF temperature, the dew condensation prevention mode is entered again. The refrigerator according to any one of claims 2 to 5, wherein the refrigerator is provided.   The refrigerator according to any one of claims 1 to 6, wherein the first predetermined time or the second predetermined time is changed based on the temperature of the freezer storage room at the end of the operation in the quick freezing mode.   When the outside air temperature is below a predetermined temperature, the compressor is rotated at a high speed for a predetermined time, and then the compressor OFF temperature is set low, and the rotation determined based on the temperature difference between the set temperature and the storage room temperature. The refrigerator according to any one of claims 1 to 7, wherein the compressor is operated at a speed.

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