TWI414739B - Refrigerator - Google Patents

Abstract

The invention provides a refrigerator, in case of abnormal stop of a mechanical chamber, capable preventing temperature overtop of the mechanical chamber, and also preventing temperature overtop of the casing of the refrigerator. For the refrigerator of the invention, a compressor (11) is provided in the mechanical chamber (10), and a mechanical chamber fan (20) is fixed for cooling the machien in the mechanical chamber, which is characterized in that: a control device (21) is used for detecting abnormal stop of the fan in the mechanical chamber, and preventing temperature overtop of the mechanical chamber and the refrigerator casing caused by stoping the compressor; and a fan abnormality display (23) is used for displaying abnormality of the fan of the mechanical chamber when the compressor stops.

Description

refrigerator

The present invention relates to a refrigerator.

In the machine room of the refrigerator, although it is a small space, it is provided with a machine that generates heat with operation, such as a compressor or a condenser. For this reason, in order to wind-heat the machine for heating, a fan is provided in the machine room. Such a machine room fan also has a phenomenon of stopping due to a failure. If the operation of the compressor is continued while the vehicle is stopped, the temperature of the compressor rises, and the temperature of the refrigerant rises, and the refrigerant piping of the outer casing of the refrigerator is placed. It has also risen excessively. In particular, in an environment with high outside temperatures, the outer casing of the refrigerator has a high temperature.

In the case of such a refrigerator, in the case where the machine room fan is in a malfunction or a state of being locked, as described in Japanese Laid-Open Patent Publication No. 2003-121032 (Patent Document 1), the following control techniques are known: In order to prevent the corruption of the food in the box as a priority, the compressor required for cooling the original refrigerator is switched to a low speed, and the operation is continued to avoid the overload conversion of the compressor. However, in the case of such a prior refrigerator, there is a problem to be solved as follows: since the compressor is switched to the low speed operation when the machine room fan fails without considering the outside air temperature, the refrigeration efficiency is caused by the low speed operation even in the following cases. Variation: The outside air temperature is relatively low, so the refrigerant temperature does not become excessively high even if the normal operation of the compressor is continued.

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2003-121032

The present invention has been made in view of the problems of the prior art, and an object thereof is to provide a refrigerator which can prevent not only the temperature of a machine room or a compressor therein but also a refrigerator casing when the machine room fan is abnormally stopped. The temperature is excessively high.

A first aspect of the present invention is a refrigerator provided with a compressor in a machine room, and a machine room fan is provided to wind-cool the machinery in the machine room to provide a machine room fan; wherein: an outer temperature sensor is provided; Measuring an outside air temperature around the refrigerator; a fan abnormality monitoring mechanism for detecting an abnormal stop of the mechanical room fan; and a compressor control mechanism, wherein the fan abnormality monitoring mechanism detects an abnormal stop of the mechanical room fan, When the outside air temperature measured by the outside air temperature sensor is higher than the first specific value, control is performed to stop the compressor; and the fan abnormality display means is configured when the compressor control unit stops the compressor. The abnormality of the machine room fan is displayed.

Another feature of the present invention is a refrigerator which is provided with a variable frequency control compressor in a machine room, and is provided with a mechanical room fan to wind a machine in the mechanical chamber to provide a machine room fan; wherein: an external temperature sensor is provided And measuring the outside air temperature of the refrigerator; the fan abnormality monitoring mechanism detects an abnormal stop of the mechanical room fan; and the compressor control mechanism detects that the abnormality of the mechanical room fan is detected by the fan abnormality monitoring mechanism. When the outside air temperature measured by the outside air temperature sensor is higher than the first specific value, the compressor is controlled to be decelerated at a lower speed than the normal operation speed; and the fan abnormality display mechanism is When the compressor is decelerated by the compressor control mechanism, an abnormality of the machine room fan is displayed.

Still another feature of the present invention is a refrigerator that is provided with a compressor that operates at a certain speed in a machine room, and that is provided with a machine room fan to wind the machinery in the machine room to provide a machine room fan; a detector that measures an outside air temperature around the refrigerator; a fan abnormality monitoring mechanism that detects an abnormal stop of the mechanical room fan; and a compressor control mechanism that detects the mechanical room fan when the fan abnormality monitoring mechanism detects When the abnormal temperature is stopped and the outside air temperature measured by the outside air temperature sensor is higher than the first specific value, the compressor is controlled to be intermittently operated at a predetermined cycle; and the fan abnormality display mechanism is as described above. The compressor control unit displays an abnormality of the machine room fan when the compressor is intermittently operated.

[Effects of the Invention]

According to the refrigerator of the present invention, when the machine room fan is abnormally stopped, if the outside air temperature is higher than a specific value, the abnormality of the machine room fan is displayed outside, and the compressor is stopped, or the low speed operation or the intermittent operation is performed, Even if the machine room fan is stopped, the temperature of the machine room does not rise due to the heat generated by the compressor. As a result, the refrigerant can be prevented from becoming high temperature, and the surface of the refrigerator can be prevented from excessively high temperature due to the refrigerant in the refrigerant pipe circulating in the outer casing of the refrigerator.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

[First embodiment]

As shown in FIG. 1, the main system of the refrigerator 1 is formed by the heat insulating box 2, and the internal storage compartment is divided into the refrigerator compartment 4 and the freezing compartment 6.

A refrigerating evaporator (hereinafter referred to as "R evaporator") 7 and a cooling fan (hereinafter referred to as "R fan") 8 are disposed on the back surface of the refrigerating compartment 4, and freezing is disposed on the back surface of the freezing compartment 6. An evaporator (hereinafter referred to as "F evaporator") 14 and a cooling fan (hereinafter referred to as "F fan") 13 are used. A machine room 10 is provided in the space below the freezer compartment 6 to form a space. As will be described later, the machine room 10 is provided with a compressor 11, a machine room fan 20, a three-way valve 15, and the like.

As shown in Fig. 2, the refrigeration cycle is sequentially connected to the compressor 11 and the condenser 12 that discharge the refrigerant, and in the subsequent stage, the two pipes are connected in parallel, and are connected to each other on the suction side of the compressor 11, and the two pipes are connected. The freezing capillary 16 and the F evaporator 14 are connected in series by the three-way valve 15; and the refrigeration capillary 17 and the R evaporator 7 are connected. Further, a check valve 18 is connected between the outlet of the F evaporator 14 and the suction side of the compressor 11.

The three-way valve 15 can switch the flow of the refrigerant to the R evaporator 7 side and the F evaporator 14 side into four modes: full opening to the flow paths of both the R evaporator 7 and the F evaporator 14 and only the open R evaporation. On the side of the unit 7, the F evaporator 14 side is closed, the R flow is closed, only the F evaporator 14 side is opened, the R evaporator 7 side is closed, and the F flow is closed.

In the refrigerating cycle, the following refrigerant flow is performed: when the temperature of the refrigerator compartment 4 and the freezer compartment 6 is higher than a specific temperature, the three-way valve 15 is fully opened to the slave compressor 11 The discharged refrigerant reaches the three-way valve 15 from the condenser 12, and is branched into the capillary tubes 16, 17, and is evaporated by both the R evaporator 7 and the F evaporator 14, respectively, and passes through the suction pipe from the accumulator to return to the compressor 11. The cold air generated by both the R evaporator 7 and the F evaporator 14 is sprayed into the respective chambers by the R fan 8 and the F fan 13, and the stored product is cooled.

When the freezing chamber 6 has been cooled to the set temperature by the cooling action described above, and the temperature of the refrigerating chamber 4 has not been lowered to the set temperature, the three-way valve 15 is switched to become R flow, and the refrigerant is introduced only from the three-way valve 15. To the side of the R evaporator 7. The cold air is introduced into the refrigerating compartment 4 by the operation of the R fan 8, and is cooled.

When only the freezing chamber 6 is at a set temperature or higher, the three-way valve 15 is F-flowed, and the refrigerant discharged from the compressor 11 is evaporated from the condenser 12 and the capillary 16 in the F evaporator 14, and returned to the compressor via the accumulator. 11. The cold air generated in the F evaporator 14 is supplied to the freezing compartment 6 by the F fan 13, and is cooled.

When the refrigerating compartment 4 and the freezing compartment 6 have been cooled to a specific temperature, respectively, they are controlled in such a manner that a temperature sensor disposed at an appropriate portion in the tank detects the same, and the switching three-way valve 15 is alternately cooled, or It is to stop the operation of the compressor 11 and the cooling fans 8, 13. These are controlled by the control device 21 shown in Fig. 1.

The configuration of the machine room 10 will be described with reference to Fig. 3 . In the machine room 10, a plurality of refrigerating cycle parts and piping such as a connecting pipe of the condenser 11 or the condenser 12 disposed on the bottom surface of the main body, the three-way valve 15, the capillary tubes 16, 17, and the heat radiating pipe 25 are disposed. Further, the machine room 10 is provided with a machine room fan (hereinafter referred to as "C fan") 20 for taking outside air into the inside of the machine room 10, and the compressor 11 and the heat pipe 25 are provided. The heating element is air-cooled. This C fan 20 is also controlled by the control unit 21.

In order to obtain a wide heat dissipation area, the heat pipe 25 is piped as follows: from the condenser 12, after passing through the sky face or the back surface of the casing of the refrigerator 1 (not shown), the machine is returned to the machine room 10, and is connected to the three sides. Valve 15.

For example, in the case where the storage place of the refrigerator 1 is in a high-temperature gas environment or in a high-temperature gas environment in summer, and the heat-dissipation condition is poor, for example, the compressor 11 cannot be dissipated due to a failure of the C-fan 20, and the high-temperature state is maintained. Then, the temperature in the machine room 10 is excessively high and the temperature of the outer casing of the refrigerator 1 is excessively high.

Fig. 4 is a block diagram showing the control function of the control device 21 in the refrigerator of the present embodiment. Fig. 5 is a flow chart showing the control function of controlling the compressor 11 to prevent the outer casing of the refrigerator 1 from becoming excessively high when the C fan 20 is abnormally stopped.

The outside air temperature sensor 22 for measuring the outside air temperature is provided in an appropriate place of the refrigerator 1 (for example, the back surface, the ceiling surface, or the side surface of the machine room 10), and the outside air temperature measurement value is input to the control device 21. Further, it is assumed that an operation panel for temperature adjustment and a display 23 are provided at appropriate places in the door of the refrigerating compartment 4 to display display information output from the control device 21. Further, the control device 21 inputs an operation signal of the power switch 24 of the refrigerator 1, controls the start and stop of the compressor 11, and controls the start and stop of the C fan 20 of the machine room 10, and monitors the operation of the C fan 20. The detection stops abnormally.

The control operation of the compressor 11 when the C fan 20 of the control device 21 is abnormally stopped is as follows.

The control device 21 starts the compressor 11 by turning on the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). Then, if no abnormality occurs in the C fan 20, the normal operation is continued (the fork is not at step S3).

When the C fan 20 is abnormally stopped, the control device 21 resets the C fan 20 to a predetermined number of times N (for example, three times) (steps S3 to S5). The time interval of this repetition is preferably set to 5 minutes, 20 minutes, and 1 hour. Then, if the C fan 20 is actually restarted after the restart control until N times, it is determined that the C fan 20 is not malfunctioning, and returns to the normal operation (the fork is NO in step S5, and the fork is stepped in step S3. no).

However, if the restart attempt of the C-fan 20 for N times is not actually restarted, it is determined whether the temperature measured by the outside air temperature sensor 22 is greater than a specific value Tref1 (= 31 ° C), Tref 2 (= 33 ° C). ) is high (YES at step S5, and proceeds to step S6). This temperature condition is merely an example and is not limited thereto. Further, in the above description, the specific value has two Tref1 and Tref2, and Tref1 is used to increase the outside air temperature, and Tref1 is used to reduce the hysteresis characteristic. However, for the sake of simplicity, Tref1 and Tref2 are used. It is also possible to set the same value. This point is also the same in the description of the following embodiments.

In this step 6, if the outside air temperature is higher than the specific value Tref2 and the compressor 11 is continuously operated, the inside of the machine room 10 becomes high temperature and the outer casing of the refrigerator 1 is excessively high temperature, and the compressor 11 is prevented in order to prevent it. The operation is stopped (steps S6, S7). Then, the display 23 is caused to display an abnormality of the C fan 20 (step S8). On the other hand, the C fan 20 is abnormally stopped, and even if the restart attempt for N times is not actually restarted, if the outside air temperature is lower than Tref2, the operation of the compressor 11 is continued to make the food in the box. The cooling is continued (steps S6, S9). However, in this case, since there is no doubt that the C-fan 20 has abnormality, the display 23 is caused to display an abnormality of the C-fan 20 (step S10). Further, even if the compressor 11 is once stopped due to the high outside air temperature, if the outside air temperature is lowered, if the outside air temperature is lower than Tref1, the compressor 11 is restarted and the cooling operation is resumed.

When the abnormality of the C fan 20 of the display 23 is seen, the user once switches the power supply and then turns back on again. If the operation is normally turned on and off, the user's power is considered to be put into operation again. The operation of the refrigerator 1 is restarted (the forks are not in steps S11 and S12).

In order to recover abnormally, no matter how many times the user restarts the operation of the refrigerator 1, if the abnormality of the C fan 20 is not restored, the manufacturer must be repaired. Therefore, when the repair technician performs the inspection and repair of the refrigerator 1, it is judged to be a technician by the special operation of the power switch 24 which has been set in advance, and is transferred to the inspection ‧ repair mode (steps S11, S12, S13) ).

In this way, according to the refrigerator 1 of the present invention, even if the C fan 20 is abnormally stopped once, the control device 21 judges whether the C fan 20 is actually malfunctioning by restarting the trial N times, because When the restart of the C fan 20 can be performed within the restart attempt of N times, the normal operation is continued, so that the abnormality of the C fan 20 can be surely determined.

Then, the control device 21 regards the C fan 20 as a true failure even if the C fan 20 cannot be restarted even if the restart attempt is made N times. Then, in this case, the control device 21 refers to the outside air temperature, and determines whether it is the following environment by whether the outside air temperature is higher than a specific temperature, for example, by stopping the compressor 11 in a high temperature environment, thereby preventing The outer casing of the refrigerator 1 is excessively heated, and the environment C is kept in a stopped state, and the outer casing of the refrigerator 1 is liable to become excessively high in temperature when the compressor 11 is continuously operated.

Further, in the present embodiment, it is assumed that the C-fan 20 is abnormally stopped by the N-time restart attempt, but this is a technique adopted as needed, and for the simplification of control, for example, The second stop detection is judged to be abnormal stop.

Further, the outside air temperature sensor 22 stops the compressor 11 when the outside air temperature is higher than the specific temperature. However, the present invention is not limited thereto, and the compressor is used when the abnormal stop of the C fan 20 is detected. 11 simple control of stopping is also possible.

[Second embodiment]

A refrigerator according to a second embodiment of the present invention will be described with reference to Figs. 4 and 6 . The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, as shown in Figs. 1 to 3 . Therefore, in the following description, elements common to the first embodiment will be described using common symbols.

The present embodiment is characterized in that the control device 21 controls the compressor 11 at the time of abnormal stop of the C fan 20 by the control device 21, and controls the compressor 11 when the C fan 20 is abnormally stopped. It is set to rotate at a low speed to make the operation of the refrigeration cycle as continuous as possible. If the C-fan 20 is not restarted after the N-time restart attempt, the C-fan 20 is regarded as an abnormal failure, and the compressor 11 is stopped according to the outside air temperature. End the operation of the refrigeration cycle.

The functional configuration of the control device 21 is the same as that of the first embodiment, as shown in FIG. Then, the control flow of the control device 21 is as shown in FIG. 6. Further, in the following aspects, the control system in which the compressor 11 is rotated at a low speed and continues to operate means that the compressor 11 is operated at a frequency that is reduced to a preset minimum frequency if the inverter 11 is controlled by the inverter; On the other hand, the case where the compressor 11 is operated at a constant speed means that, in the following description, instead of the control for reducing the rotation to the low speed, the rotation of the compressor 11 is intermittently operated at a predetermined cycle. control.

The control device 21 turns on the compressor 11 by the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). Then, if no abnormality occurs in the C fan 20, the normal operation is continued (the fork is not at step S3).

When the C fan 20 is abnormally stopped, the control device 21 continues the operation until the compressor 11 reduces the number of rotations to a specific value (steps S3 and S4A). Then, the restart of the C fan 20 is repeated until the preset number of times N (steps S4B, S5). The number of times of repetition N and the time interval of repetition are the same as those of the first embodiment. Then, if the C fan 20 is actually restarted after the restart control until N times, it is determined that the C fan 20 is not malfunctioning, and returns to the normal operation (the fork is NO in step S5, and the fork is stepped in step S3. no).

However, if the restart attempt of the C-fan 20 for N times is not actually restarted, it is determined whether the temperature measured by the outside air temperature sensor 22 is greater than a specific value Tref1 (= 31 ° C), Tref 2 (= 33 ° C). ) is high (YES at step S5, and proceeds to step S6). This temperature condition is the same as that of the first embodiment.

Then, in the aspect after step S6, the same control as in the first embodiment is executed.

In this way, the refrigerator 1 according to the second embodiment can exhibit the same functions and effects as those of the first embodiment. In addition, according to the second embodiment, when the abnormal stop of the C fan 20 is detected, the compressor 11 is once switched to a specific low speed operation, while the operation of the continuous refrigeration cycle is continued, and the C fan is operated. Since the re-starting of 20 is repeated until N times, there is an advantage that during the restart attempt, the temperature inside the tank can be suppressed from rising, and damage to the food in the box can be avoided as much as possible.

Further, in the second embodiment, the outside air temperature sensor 22 stops the compressor 11 when the outside air temperature is high. However, the present invention is not limited thereto, and the abnormality of the C fan 20 is detected. When it is stopped and the N-restart is attempted and the C-fan 20 is not restarted, the control for stopping the compressor 11 without considering the outside air temperature may be employed.

[Third embodiment]

A refrigerator according to a third embodiment of the present invention will be described with reference to Figs. 4 and 7 . The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, as shown in Figs. 1 to 3 . Therefore, in the following description, elements common to the first embodiment will be described using common symbols.

The present embodiment is also characterized in that the control device 21 controls the compressor 11 when the C fan 20 is abnormally stopped by the control device 21, and controls the device 11 to perform N times when the C fan 20 is abnormally stopped. If the C fan 20 is not restarted, it is regarded as an abnormal failure, and the compressor 11 is stopped according to the outside air temperature. If the outside air temperature is lowered thereafter, the compressor 11 is re-executed. The start causes the operation of the refrigeration cycle to be intermittent in the possible range.

The functional configuration of the control device 21 is the same as that of the first embodiment, as shown in FIG. Then, the control flow of the control device 21 is as shown in FIG.

The control device 21 turns on the compressor 11 by the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). Thereafter, the processing of steps S1 and S10 is the same as the processing of the first embodiment shown in FIG. 5.

It is confirmed that the C fan 20 is abnormally stopped, and the compressor 11 is stopped or continuously operated according to the temperature of the outside air temperature. After the display 23 displays the abnormality of the C fan 20, the control device 21 continuously monitors the outside air temperature. After the compressor 11 is stopped, if the temperature is less than Tref1 as measured by the outside air temperature sensor 22, the elapsed time from the stop of the compressor 11 is observed, and it is determined whether or not a certain time has elapsed (steps S21, S22). . Then, if the outside air temperature becomes Tref1 or less and the specific time has elapsed since the compressor 11 was stopped, the compressor 11 is restarted (step S23). At the time of restarting here, since the abnormality of the C fan 20 has not been eliminated, the display 23 is continuously displayed with the abnormality of the C fan 20 (step S24).

The control process after restarting the compressor 11 is the same as the process of step S11 and subsequent steps in the first embodiment shown in Fig. 5. When the abnormal notification of the C fan 20 of the display 23 is seen, the user once switches the power supply. In the case of being turned back on again, if the operation is normally turned on and off, it is regarded that the power of the user is put back into operation, and the operation of the refrigerator 1 is restarted (in step S11, S12, the fork is not ).

In order to recover abnormally, no matter how many times the user restarts the operation of the refrigerator 1, if the abnormality of the C fan 20 is not restored, the manufacturer must be repaired. Therefore, when the repair technician performs the inspection and repair of the refrigerator 1, it is judged to be a technician by the special operation of the power switch 24 which has been set in advance, and is transferred to the inspection ‧ repair mode (steps S11, S12, S13) ).

In this way, according to the refrigerator 1 of the third embodiment, the same effects and effects as those of the first embodiment can be exhibited. In addition, according to the third embodiment, the C fan 20 is abnormally stopped, and the compressor 11 is stopped even if the outside air temperature is high, and thereafter the outer air temperature is lowered to Tref1, and the compressor 11 is stopped. When the specific time has elapsed, the compressor 11 is restarted, and the cooling in the tank is started again. In this way, it is possible to prevent the outer casing of the refrigerator 1 from becoming excessively high due to the high outside air temperature and the stop of the compressor 11. And try to avoid damage to the food inside the box.

Further, in the present embodiment, it is assumed that the abnormal restart of the C fan 20 is confirmed by the N-time restart attempt, but this is a technique employed as needed, and for the simplification of control, It is also possible to stop the detection once and determine that it is abnormally stopped.

[Fourth embodiment]

A refrigerator according to a fourth embodiment of the present invention will be described with reference to Figs. 4 and 8 . The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, as shown in Figs. 1 to 3 . Therefore, in the following description, elements common to the first embodiment will be described using common symbols.

The present embodiment is also characterized in that the control device 21 controls the compressor 11 when the C fan 20 is abnormally stopped by the control device 21, and controls the compressor 11 when the C fan 20 is abnormally stopped. In order to rotate at a low speed, the operation of the refrigeration cycle is continued as much as possible. If the restart attempt is repeated N times and the C fan 20 is not restarted, it is regarded as an abnormal failure, and the compressor 11 is stopped according to the outside air temperature, and The operation of the refrigeration cycle is once completed, but as in the third embodiment, the outside air temperature is also monitored thereafter. If the outside air temperature is lowered and a certain time has elapsed since the stop of the compressor 11, the compressor 11 is restarted. Start the cooling in the box again.

The functional configuration of the control device 21 is the same as that of the first embodiment, as shown in FIG. Then, the control flow of the control device 21 is as shown in FIG. Further, in the following aspects, the control system in which the compressor 11 is rotated at a low speed and continues to operate means that the compressor 11 is operated at a frequency that is reduced to a preset minimum frequency if the inverter 11 is controlled by the inverter; On the other hand, the case where the compressor 11 is operated at a constant speed means that, in the following description, instead of the control for reducing the rotation to the low speed, the rotation of the compressor 11 is intermittently operated at a predetermined cycle. control.

The control device 21 turns on the compressor 11 by the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). After the step S2, the processing of steps S3 to S10 and the processing of steps S11 to S13 are common to the processing of the third embodiment shown in FIG. 6. Then, the processing of steps S21 to S24 subsequent to step S8 is common to the processing of the third embodiment shown in FIG.

In this way, the refrigerator 1 according to the fourth embodiment can exhibit the same functions and effects as those of the first embodiment. Further, according to the fourth embodiment, as in the second embodiment, the control device 21 rotates the compressor 11 at a low speed when the C-fan 20 is abnormally stopped, so that the operation of the refrigeration cycle is continued as much as possible. If the C-fan 20 is not restarted after the N-th restart attempt, the compressor 11 is regarded as an abnormal failure, and the compressor 11 is stopped according to the outside air temperature, and the operation of the refrigeration cycle is once completed, so the restart attempt is performed here. During the period, the temperature inside the box can be suppressed from rising, and the damage of the food inside the box can be avoided as much as possible.

In addition, according to the fourth embodiment, the fourth embodiment is controlled such that, in the case of the abnormality of the C fan 20, if the outside air temperature is high, the operation of the compressor 11 is once stopped, and thereafter, When the outside air temperature is monitored, if the outside air temperature is lowered and a certain time has elapsed since the stop of the compressor 11, the compressor 11 is restarted, and the cooling in the tank is started again. Therefore, similarly to the third embodiment, it is possible to prevent the outer casing of the refrigerator 1 from being excessively heated by the high outside air temperature and the stop of the compressor 11, and the damage of the food in the box can be avoided as much as possible.

[Fifth Embodiment]

A refrigerator according to a fifth embodiment of the present invention will be described with reference to Figs. 4 and 9 . The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, as shown in Figs. 1 to 3 . Therefore, in the following description, elements common to the first embodiment will be described using common symbols.

The present embodiment is also characterized in that the control device 21 controls the compressor 11 when the C fan 20 is abnormally stopped by the control device 21, and the control device 21 controls the compressor even when the C fan 20 is abnormally stopped. If the C-fan 20 is not restarted, it is regarded as an abnormal failure, and the rotational speed of the compressor 11 is changed in accordance with the outside air temperature. However, in the case of the present embodiment, the following points are different: for the control of the compressor 11 of the control device 21 in the second embodiment shown in Fig. 6, the comparison reference value Tref1 of the two stages is set in the outside air temperature. (=31 ° C) / Tref2 (= 33 ° C) and Tref3 (= 35 ° C) / Tref4 (= 37 ° C).

The functional configuration of the control device 21 is the same as that of the first embodiment, as shown in FIG. Then, the control flow of the control device 21 is as shown in FIG. Further, in the following aspects, the control system in which the compressor 11 is rotated at a low speed and continues to operate means that the compressor 11 is operated at a frequency that is reduced to a preset minimum frequency if the inverter 11 is controlled by the inverter; On the other hand, the case where the compressor 11 is operated at a constant speed means that, in the following description, instead of the control for reducing the rotation to the low speed, the rotation of the compressor 11 is intermittently operated at a predetermined cycle. control.

The control device 21 turns on the compressor 11 by the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). Then, if no abnormality occurs in the C fan 20, the normal operation is continued (the fork is not at step S3).

When the C fan 20 is abnormally stopped, the control device 21 restarts the restart of the C fan 20 until the preset number N is reached (steps S4 and S5). The number of times of repetition N and the time interval of repetition are the same as those of the first embodiment. Then, if the C fan 20 is actually restarted after the restart control until N times, it is determined that the C fan 20 is not malfunctioning, and returns to the normal operation (the fork is NO in step S5, and the fork is stepped in step S3. no).

However, if the restart attempt of the C-fan 20 for N times is not actually restarted, it is determined whether the temperature measured by the outside air temperature sensor 22 is lower than the first reference value Tref1 (= 31 ° C) / Tref 2 (= 33 ° C) is high (YES at step S5, and proceeds to step S6). This temperature condition is the same as that of the first embodiment. Then, if the outside air temperature is lower than the first reference value Tref1/Tref2, the air cooling of the machine room 10 is stopped by the abnormal stop of the C fan 20, and the machine room 10 is not operated even if the compressor 11 is continuously operated. Excessively becoming a high temperature, and the temperature of the outer casing of the refrigerator 1 is not excessively high, so that the normal operation of the compressor 11 is continued, and the indicator 23 is caused to display the abnormal stop of the C fan 20, and the user is notified (in step S6). If the fork is no, proceed to steps S9 and S10).

In step S6, if the outside air temperature is higher than the first reference value Tref1 (= 31 ° C) / Tref 2 (= 33 ° C), and the normal operation of the compressor 11 is continued, the inside of the machine room 10 is likely to be high temperature, so the steps are performed. Control of S7A~S7C. In other words, since the compressor 11 is not in the following environment, the compressor 11 is maintained at the normal operation speed R1 (steps S7A, S7B), and the environment is such that the outer temperature ratio is the second even when the C fan 20 is in an abnormal stop state. When the reference value Tref3/Tref4 is low, the inside of the machine room 10 becomes high temperature, and the temperature of the outer casing of the refrigerator 1 becomes excessively high. In this case, by stopping the C fan 20, in order to prevent the temperature from rising, it is necessary to rotate the compressor 11 at a high speed R2 (>R1), but it is necessary to maintain the running speed of R1 to avoid the inside of the box as much as possible. The damage of the food.

On the other hand, when the C-fan 20 is in an abnormally stopped state, if the outside air temperature is higher than the second reference value Tref3/Tref4, the inside of the machine room 10 becomes high temperature, and the temperature of the casing of the refrigerator 1 becomes excessively high, in order to avoid The compressor 11 is continuously operated in the event of damage to the food in the box, but the operation is performed until the low speed R3 (<R1) is reduced (steps S7A, S7C). Then, in either of the above cases, the indicator 23 is caused to display the abnormal stop of the C fan 20 (step S8).

Thereafter, the processing in and after step S11 is the same as in the first embodiment. In order to recover abnormally, no matter how many times the user restarts the operation of the refrigerator 1, if the abnormality of the C fan 20 is not restored, it must be made to the manufacturer. Repair commission. Therefore, when the repair technician performs the inspection and repair of the refrigerator 1, it is judged to be a technician by the special operation of the power switch 24 which has been set in advance, and is transferred to the inspection ‧ repair mode (steps S11, S12, S13) ).

In this way, the refrigerator 1 according to the fifth embodiment can exhibit the same functions and effects as those of the first embodiment. In addition, according to the fifth embodiment, the reference of the outside air temperature is divided into two stages, and in a high-temperature environment in which the outside air temperature exceeds 35 ° C, the compressor 11 is operated at a certain speed to suppress the box. When the internal temperature rises and the outside air temperature becomes higher, the rotation speed of the compressor 11 is more concentrated. By this means, the operation of the minimum capacity of the refrigeration cycle can be continued, and the temperature of the outer casing of the refrigerator 1 can be prevented. Excessive temperature rises and tries to avoid damage to the food in the box.

Furthermore, in the above description, the rotation speed of the compressor 11 is controlled in two stages by two-stage temperature monitoring. However, if more stages are provided, the rotation speed is continuously made according to the outside air temperature. Sexual changes are also possible.

Further, when the compressor 11 is operated at a constant speed, the ratio of the operation time in one cycle during the intermittent operation may be changed.

[Sixth embodiment]

A refrigerator according to a sixth embodiment of the present invention will be described with reference to Figs. 10 and 11 . The structure of the refrigerator 1 in the present embodiment is the same as that of the first embodiment, as shown in Figs. 1 to 3 . Therefore, in the following description, elements common to the first embodiment will be described using common symbols.

The present embodiment is characterized in that, as shown in FIG. 10, a machine room temperature sensor 26 for measuring the temperature in the room is provided in the machine room 10, and the C fan 20 is operated by the control device 21. The control of the compressor 11 at the time of abnormal stop is performed with reference to the measured temperature of the outside air temperature sensor 22 and with reference to the measured temperature of the machine room temperature sensor 26. That is, the control device 21 is controlled such that when the C fan 20 is abnormally stopped, if the compressor 11 is restarted for N times and the C fan 20 is not restarted, it is regarded as an abnormal failure, and the outside air temperature is considered. In the case where the temperature is high and the temperature of the machine room is also high, the rotational speed of the compressor 11 is switched to a low speed or stopped. Further, the machine room temperature sensor 26 is preferably provided in the vicinity of the compressor 11 or the heat pipe 25 which is provided in the machine room in the heat generating component.

The functional configuration of the control device 21 is as shown in FIG. Then, the control flow of the control device 21 is as shown in FIG. The control device 21 turns on the compressor 11 by the power source, activates the C fan 20, and monitors the operation of the C fan 20 (steps S1, S2). Then, if no abnormality occurs in the C fan 20, the normal operation is continued (the fork is not at step S3).

When the C fan 20 is abnormally stopped, the control device 21 restarts the restart of the C fan 20 until the preset number N is reached (steps S4 and S5). The number of times of repetition N and the time interval of repetition are the same as those of the first embodiment. Then, if the C fan 20 is actually restarted after the restart control until N times, it is determined that the C fan 20 is not malfunctioning, and returns to the normal operation (the fork is NO in step S5, and the fork is stepped in step S3. no).

However, if the restart attempt of the C-fan 20 for N times is not actually restarted, it is determined whether the temperature measured by the outside air temperature sensor 22 is greater than a specific value Tref1 (= 31 ° C) / Tref 2 (= 33 ° C ) is high (YES at step S5, and proceeds to step S6). This temperature condition is the same as that of the first embodiment. Then, if the outside air temperature is lower than the specific value Tref1/Tref2, the air cooling of the machine room 10 is stopped by the abnormal stop of the C fan 20, and the machine room 10 does not become high even if the compressor 11 is continuously operated. The temperature and the temperature of the outer casing of the refrigerator 1 are not excessively high, so that the normal operation of the compressor 11 is continued, and the indicator 23 is caused to display the abnormal stop of the C fan 20, and the user is notified (the fork is not succeeded in step S6). Go to steps S9, S10).

In step S6, if the outside air temperature is higher than the specific value Tref1/Tref2, the mechanical room temperature is further referred to, and if the machine room temperature has become excessively high, the compressor 11 is stopped, thereby preventing the machine room 10 from being thereby obtained. The inside becomes a high temperature, and the temperature of the outer casing of the refrigerator 1 becomes excessively high (steps S6, S31, and S32). Then, the indicator 23 is caused to display the abnormal stop of the C fan 20 and notify the user (step S8).

Thereafter, the processing in and after step S11 is the same as in the first embodiment. In order to recover abnormally, no matter how many times the user restarts the operation of the refrigerator 1, and the abnormality of the C fan 20 is not restored, the manufacturer must be repaired. Commissioned. Therefore, when the repair technician performs the inspection and repair of the refrigerator 1, it is judged to be a technician by the special operation of the power switch 24 which has been set in advance, and is transferred to the inspection ‧ repair mode (steps S11, S12, S13) ).

According to this aspect, the refrigerator 1 according to the sixth embodiment can exhibit the same functions and effects as those of the first embodiment. In addition, according to the sixth embodiment, the machine room temperature sensor 26 for measuring the temperature in the room is provided in the machine room 10, and the compressor is abnormally stopped by the control unit 21 when the C fan 20 is abnormally stopped. The control of 11 is performed with reference to the measured temperature of the outside air temperature sensor 22 and with reference to the measured temperature of the machine room temperature sensor 26, when the outside air temperature is high temperature and the machine room temperature is also high temperature, The rotation speed of the compressor 11 is stopped, and by this control, as long as the outer casing of the refrigerator does excessively rise in temperature, the compressor 11 is stopped, and it is possible to prevent such excessive temperature from becoming excessive.

In the above description, the control for stopping the compressor 11 will be described. However, instead of this, the compressor 11 may be controlled to rotate at a low speed and continue to operate. Then, in this case, if the compressor 11 is controlled by the inverter, the compressor 11 is rotated at a low speed by operating at a frequency that is reduced to a preset minimum frequency. On the other hand, in the case where the compressor 11 is operated at a constant speed, instead of the control for reducing the rotation to the low speed, the compressor 11 is controlled to intermittently operate the rotation of the compressor 11 at a predetermined cycle.

1. . . refrigerator

2. . . Refrigerator body

4. . . Cold room

6. . . Freezer

7. . . Refrigeration evaporator (R evaporator)

8. . . Refrigeration cooling fan (R fan)

10. . . Mechanical room

11. . . compressor

12. . . Condenser

13. . . Cooling cooling fan (F fan)

14. . . Freezer evaporator (F evaporator)

15. . . Tripartite valve

20. . . Mechanical room fan (C fan)

twenty one. . . Control device

twenty two. . . External temperature sensor

twenty three. . . Indicator

twenty four. . . switch

25. . . Heat pipe

26. . . Mechanical room temperature sensor

Figure 1 is a cross-sectional view showing a refrigerator according to a first embodiment of the present invention;

Figure 2 is a refrigeration cycle diagram of the refrigerator of the above embodiment;

Figure 3 is a perspective view of the inside of the machine compartment of the refrigerator of the above embodiment;

Figure 4 is a block diagram of a control device in the refrigerator of the above embodiment;

Figure 5 is a flow chart showing the control action of the control device in the refrigerator of the above embodiment;

Figure 6 is a flow chart showing the control operation of the control device in the refrigerator of the second embodiment of the present invention;

Figure 7 is a flow chart showing the control operation of the control device in the refrigerator of the third embodiment of the present invention;

Figure 8 is a flow chart showing the control operation of the control device in the refrigerator of the fourth embodiment of the present invention;

Figure 9 is a flow chart showing the control operation of the control device in the refrigerator of the fifth embodiment of the present invention;

Figure 10 is a block diagram of a control device in a refrigerator according to a sixth embodiment of the present invention; and

Fig. 11 is a flow chart showing the control operation of the control device in the refrigerator of the above embodiment.

(no component symbol description)

Claims (4)

A refrigerator is provided with a compressor in a machine room, and is provided with a machine room fan to cool the machine in the machine room by air; and is characterized in that: an external temperature sensor is provided, which measures the outside air temperature of the refrigerator; the fan is abnormal a monitoring mechanism that detects an abnormal stop of the machine room fan; and a fan abnormality display mechanism that displays an abnormality of the machine room fan when the abnormality of the machine room fan is detected by the fan abnormality monitoring mechanism; a compressor control mechanism that controls the compressor to stop when the fan abnormality monitoring mechanism detects an abnormal stop of the machine room fan and the outside air temperature measured by the outside air temperature sensor is higher than a specific temperature Even if the fan abnormality monitoring mechanism detects the abnormal stop of the machine room fan, when the outside air temperature measured by the outside air temperature sensor is lower than a specific value, the operation of controlling the compressor continues. The refrigerator of claim 1, comprising: a machine room temperature sensor for measuring a temperature of the machine room; wherein the compressor control mechanism detects that the fan of the machine room is abnormally stopped when the fan abnormality monitoring mechanism detects When the outside air temperature measured by the outside air temperature sensor is higher than a specific value, and the machine room temperature measured by the machine room temperature sensor is higher than a specific value, control is performed to stop the compressor; even if the fan abnormality monitoring is performed The mechanism detects an abnormal stop of the mechanical chamber fan, the outside air temperature measured by the external air temperature sensor, and the mechanical room temperature measured by the mechanical room temperature sensor. When any one is lower than a specific value, and when both the outside air temperature measured by the outside air temperature sensor and the machine room temperature measured by the machine room temperature sensor are lower than a specific value, control is performed so that The operation of the aforementioned compressor continues. The refrigerator according to claim 1, wherein the compressor control mechanism is controlled to refer to an outside air temperature measured by the outside air temperature sensor after a predetermined time has elapsed, such as a specific value as described above. If it is low, the compressor is restarted. The refrigerator according to claim 1, wherein the fan abnormality monitoring mechanism restarts the engine to a certain number of times when the machine room fan is stopped, and does not start even if the machine room fan is restarted by the specific number of times. At this time, it is determined that the machine room fan is abnormally stopped, and the compressor control mechanism is notified.