JP2019207087A - Cooling storage - Google Patents

Abstract

To shorten a time required for identifying a cause of high temperature abnormality of a cooling storage.SOLUTION: In a refrigerator 1, high temperature abnormality 1 is informed under the assumption that a compressor 22 is stopped, in a case where a state that an inside temperature is higher than a set temperature by 10 K (8.3 K from upper limit temperature) or more is continued for two hours, and difference between a temperature of a condenser 23 and an ambient temperature of the refrigerator 1 is constantly less than 3 K, and high temperature abnormality 2 is informed under the assumption that the compressor 22 is operated, in a case where a state that the inside temperature is higher than the set temperature by 10 K or more is continued for 2 hours, and the difference becomes 3 K or more even if temporarily during that time.SELECTED DRAWING: Figure 6

Description

  The technology disclosed in this specification relates to a cold storage.

  2. Description of the Related Art Conventionally, a technique for notifying a high temperature abnormality when the internal temperature of a cooling storage becomes higher than a predetermined cooling temperature range is known (see, for example, Patent Document 1). Specifically, the temperature alarm device described in Patent Document 1 issues a high temperature alarm after a certain time when the temperature measuring element detects a temperature higher than a predetermined temperature range.

  Conventionally, there is known a technique for notifying a low temperature abnormality when the internal temperature of a cooling storage is lower than a predetermined cooling temperature range (see, for example, Patent Document 1). Specifically, the temperature alarm device described in Patent Document 1 issues a low temperature alarm after a predetermined time when the temperature measuring element detects a temperature lower than a predetermined temperature range.

  Further, conventionally, in a cooling storage, when a predetermined defrosting start condition is satisfied, the evaporator is defrosted by heating the evaporator with a heating unit, and when the internal temperature rises to a predetermined defrosting end temperature, defrosting is performed. What ends is known. Further, in such a cooling storage, there is known one that reports a defrosting abnormality when the temperature inside the chamber does not rise to the defrosting end temperature even after a certain period of time (see, for example, Patent Document 2). ). Specifically, the refrigerator described in Patent Document 2 includes a defrosting temperature detection unit that detects the temperature of a cooler (equivalent to an evaporator), and the temperature of the defrosting temperature detection unit does not increase after the defrosting heater is energized. When the time of the defrost timer is longer than the set time, an alarm means is used to alarm.

JP-A-2-29585 JP-A-4-158182

  Generally, when a high temperature abnormality, low temperature abnormality, defrosting abnormality, etc. occurs, an operator who performs maintenance of the cooling storage (for example, a service person of the manufacturer of the cooling storage) inspects the cooling storage to identify the cause, and the identified cause Perform maintenance according to For this reason, if it takes time to identify the cause, it takes time for the maintenance to be completed, and there is a possibility that stored items such as food may deteriorate. For this reason, it is desirable to identify the cause in a short time.

In the present specification, a technique for shortening the time required for identifying the cause of the high temperature abnormality of the cooling storage is disclosed.
Moreover, in this specification, the technique which shortens the time required to identify the cause of the low temperature abnormality of a cooling storage is disclosed.
Moreover, in this specification, the technique which shortens the time required to identify the cause of the defrost abnormality of a cooling storage is disclosed.

  The cooling storage disclosed in this specification includes a storage body having an open / close door, a refrigeration circuit having a compressor and a condenser, an internal temperature sensor for detecting the internal temperature, and a condensation for detecting the temperature of the condenser. A temperature sensor, an ambient temperature sensor for detecting the temperature around the cooling storage, a notification unit for notifying abnormality, and a control unit, wherein the control unit operates the compressor to move inside the store. In the cooling operation for cooling, the compressor is stopped when the internal temperature detected by the internal temperature sensor decreases to a predetermined lower limit temperature, and then the compression is performed when the internal temperature rises to a predetermined upper limit temperature. A cooling operation for resuming the operation of the machine, and a notification process for notifying the notification unit of an abnormality when a high temperature abnormality occurs, and the state in which the internal temperature is higher than the upper limit temperature by a predetermined temperature continues for a predetermined time, And in the meantime When the difference between the temperature detected by the condenser temperature sensor and the temperature detected by the ambient temperature sensor is always less than a predetermined value, the first type abnormality is notified, and the internal temperature is higher than the upper limit temperature. A notification process for notifying a second type of abnormality is executed when the state where the temperature is higher than the predetermined temperature continues for the predetermined time and the difference is temporarily equal to or higher than the predetermined value during that time.

The cause is different between the first type abnormality (hereinafter referred to as “first type high temperature abnormality”) and the second type abnormality (hereinafter referred to as “second type high temperature abnormality”). Conventionally, since the operator could not know whether the high temperature abnormality is the first type high temperature abnormality or the second type high temperature abnormality, the following problem has occurred.
-The second type of high temperature abnormality is not due to the failure of the parts, but may be caused by the installation environment and usage status of the cooling storage. Conventionally, parts are inspected even in the case of the second type of high temperature abnormality, and it takes time to identify the cause.
The parts that may have failed are different between the first type high temperature abnormality and the second type high temperature abnormality. Conventionally, for example, even the first type of high temperature abnormality is inspected to the parts that cause the second type of high temperature abnormality, and it takes time to identify the cause because the number of parts to be inspected increases.
According to said cooling storage, it distinguishes and alert | reports 1st type high temperature abnormality and 2nd type high temperature abnormality. In other words, the cooling storage binarizes and reports the high temperature abnormality. For this reason, for example, in the case of the first type of high temperature abnormality, the operator does not need to check the parts that cause the second type of high temperature abnormality. For this reason, the time required for specifying the cause of the high temperature abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance.

  The control unit may end the notification when the internal temperature detected by the internal temperature sensor decreases to the lower limit temperature.

  If the internal temperature drops to the lower limit temperature, it can be said that the high temperature abnormality is surely eliminated. For this reason, according to said cooling storage, alerting | reporting can be complete | finished when high temperature abnormality is eliminated reliably.

  The cooling storage disclosed in this specification includes a storage body having an open / close door, a refrigeration circuit having a compressor and a condenser, an internal temperature sensor for detecting the internal temperature, and a condensation for detecting the temperature of the condenser. A temperature sensor, an ambient temperature sensor for detecting the temperature around the cooling storage, a notification unit for notifying abnormality, and a control unit, wherein the control unit operates the compressor to move inside the store. In the cooling operation for cooling, the compressor is stopped when the internal temperature detected by the internal temperature sensor decreases to a predetermined lower limit temperature, and then the compression is performed when the internal temperature rises to a predetermined upper limit temperature. A cooling operation for resuming the operation of the machine, and a notification process for notifying the notification unit of the abnormality when a low temperature abnormality occurs, and the state where the internal temperature is lower than the lower limit temperature by a predetermined temperature or more continues for a predetermined time, And in the meantime When the difference between the temperature detected by the condenser temperature sensor and the temperature detected by the ambient temperature sensor is always less than a predetermined value, the first type abnormality is notified, and the internal temperature is lower than the lower limit temperature. A notification process for notifying the second type of abnormality is executed when the state where the temperature is lower than the predetermined temperature continues for the predetermined time and the difference is temporarily equal to or higher than the predetermined value during that time.

The cause is different between the first type of abnormality (hereinafter referred to as “first type of low temperature abnormality”) and the second type of abnormality (hereinafter referred to as “second type of low temperature abnormality”). Conventionally, since the operator could not know whether the low temperature abnormality was the first type low temperature abnormality or the second type low temperature abnormality, there was the following problem.
• The first type of low-temperature anomalies may be caused by the installation environment of the cooling storage, not the failure of the parts. Conventionally, parts are inspected even in the case of the first type of low temperature abnormality, and it takes time to identify the cause.
The parts that may have failed are different between the first type low temperature abnormality and the second type low temperature abnormality. Conventionally, for example, even the first type of low temperature abnormality has been inspected to the parts causing the second type of low temperature abnormality, and the number of parts to be inspected increases, so it takes time to identify the cause.
According to said cooling storage, it distinguishes and alert | reports a 1st type low temperature abnormality and a 2nd type low temperature abnormality. In other words, the cooling storage binarizes and reports the low temperature abnormality. For this reason, for example, in the case of the first type of low temperature abnormality, the operator does not need to check the parts that cause the second type of low temperature abnormality. For this reason, the time required for specifying the cause of the low temperature abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance.

  The control unit may end the notification when the internal temperature detected by the internal temperature sensor rises to the upper limit temperature.

  If the internal temperature rises to the upper limit temperature, it can be said that the low temperature abnormality has been reliably eliminated. For this reason, according to said cooling storage, alerting | reporting can be complete | finished when low temperature abnormality is eliminated reliably.

  The cooling storage disclosed in the present specification includes a storage body having an open / close door, a refrigeration circuit having a compressor and an evaporator, an internal temperature sensor for detecting the internal temperature, and a heating unit for heating the evaporator. The defrosting unit includes a notifying unit for notifying abnormality and a control unit, and the control unit stops the compressor and heats the evaporator by the heating unit when a predetermined defrosting start condition is satisfied. A defrosting start process for starting the operation, a defrosting end process for ending the defrosting operation when the internal temperature detected by the internal temperature sensor rises to a predetermined defrosting end temperature, and the defrosting operation. When the forced decommissioning operation forcibly terminating the defrosting operation when the inside temperature does not rise to the defrosting end temperature even after a certain time has elapsed from the start, and when the forced termination process is executed, Information that informs the notification section of the abnormality When the forced end process is performed and the internal temperature is lower than a temperature obtained by subtracting a predetermined temperature from the defrost end temperature, the first type abnormality is notified and the forced end process is executed. When the internal temperature at that time is equal to or higher than the temperature obtained by subtracting the predetermined temperature from the defrosting end temperature, a notification process for notifying the second type abnormality is executed.

The cause is different between the first type abnormality (hereinafter referred to as “first type defrost abnormality”) and the second type abnormality (hereinafter referred to as “second type defrost abnormality”). Conventionally, since the operator could not know whether the defrost abnormality is the first type defrost abnormality or the second type defrost abnormality, the following problem has occurred.
-The second type of defrosting abnormality may be caused by the usage status of the cooling storage, not the failure of the parts. Conventionally, parts are inspected even in the case of the second type defrost abnormality, and it takes time to identify the cause.
The parts that may have failed are different between the first type defrost abnormality and the second type defrost abnormality. Conventionally, for example, even the first type defrost abnormality is inspected to the parts that cause the second type defrost abnormality, and the number of parts to be inspected increases, so it takes time to identify the cause.
According to said cooling storage, it distinguishes and alert | reports 1st type defrost abnormality and 2nd type defrost abnormality. In other words, the cooling storage binarizes and reports the defrost abnormality. For this reason, for example, in the case of the first type defrost abnormality, the operator does not have to check the parts that cause the second type defrost abnormality. For this reason, the time required for specifying the cause of the defrost abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance.

  An operation unit that receives an instruction to end the notification may be provided, and the control unit may end the notification when the operation unit receives the instruction.

If the notification is not terminated when the maintenance is completed, the defrost abnormality remains informed even when the maintenance is completed, and the user of the cooling storage may be confused.
According to said cooling storage, notification of a defrost abnormality can be complete | finished by the operator who performed the maintenance operating an operation part, for example. Thereby, it can suppress that the user of a cooling storage is confused.

  The notification unit is a display unit that displays the internal temperature, and when the control unit notifies the first type abnormality or the second type abnormality, the internal temperature and the first type abnormality are displayed. The alarm number or the alarm number of the second type abnormality may be alternately displayed on the display unit.

  According to the above cooling storage, one display unit is used for displaying the internal temperature and displaying the alarm number. Therefore, the display unit for displaying the internal temperature and the display unit for displaying the alarm number are separately provided. The cost can be reduced compared with the case of preparing for.

  A light-emitting unit that notifies that the inspection of the cooling storage is necessary by lighting is provided, and the control unit turns off the light-emitting unit when displaying the internal temperature, and the alarm number of the first type abnormality or When the alarm type number for the second type of abnormality is displayed, the light emitting unit may be turned on.

When the internal temperature and the alarm number are alternately displayed, it is difficult for the user to determine whether the internal temperature is displayed or whether the alarm number is displayed.
According to the above cooling storage, the light emitting part is turned off when displaying the internal temperature, and the light emitting part is turned on when displaying the alarm number, so the alarm number is displayed whether the internal temperature is displayed. It becomes easy to understand whether it is.

  The technology disclosed in this specification can be realized in various modes such as an apparatus, a method, a computer program for realizing the functions of these apparatuses or methods, a recording medium on which the computer program is recorded, and the like.

Front view of the refrigerator according to the first embodiment Sectional view of the AA line shown in FIG. Cross-sectional view of the cooling unit and its surroundings Block diagram showing the electrical configuration of the refrigerator Enlarged view of the operation unit Timing chart for explaining notification of high temperature abnormality Timing chart for explaining notification of low temperature abnormality according to Embodiment 2 Timing chart for explaining notification of defrost abnormality according to Embodiment 3

<Embodiment 1>
The first embodiment will be described with reference to FIGS. In the following description, the vertical direction and the horizontal direction are based on the vertical direction and the horizontal direction shown in FIG. 1, and the front-rear direction is based on the front-back direction shown in FIG.

(1) Whole structure of refrigerator With reference to FIG.1 and FIG.2, the whole structure of the refrigerator 1 (an example of a cooling storage) which concerns on Embodiment 1 is demonstrated. The refrigerator 1 is a two-door refrigerator mainly used for business.

  As shown in FIG. 2, the refrigerator 1 includes a storage body 11 made of a heat insulating box having openings 11A and 11B on the front side. The openings 11 </ b> A and 11 </ b> B are partitioned vertically by a prismatic front frame 11 </ b> C extending in the left-right direction at the approximate center in the vertical direction. As shown in FIGS. 1 and 2, two heat insulating doors 12 (12 </ b> A, 12 </ b> B) that open and close the openings 11 </ b> A and 11 </ b> B are attached to the storage body 11. The heat insulating door 12 is an example of an open / close door. Four legs 13 that support the storage body 11 are attached to the lower surface of the storage body 11.

  As shown in FIG. 2, a machine room 16 whose upper side is opened is provided on the storage body 11. The machine room 16 accommodates a cooling unit 17, an electrical equipment box 18, an operation unit 19 (see FIG. 1), an ambient temperature thermistor 33 (see FIG. 4), a power supply unit (not shown), and the like.

A control unit 35 (see FIG. 4) described later is accommodated in the electrical box 18.
As shown in FIG. 1, the operation unit 19 is exposed to the front side from an opening provided on the front side of the machine room 16. The operation unit 19 will be described later.
An ambient temperature thermistor 33 (an example of an ambient temperature sensor) is provided in the operation unit 19. The ambient temperature thermistor 33 detects the ambient temperature of the refrigerator 1 and outputs it to the controller 35. Since the ambient temperature thermistor 33 is disposed outside the storage body 11, the ambient temperature can be rephrased as the outside air temperature.

  With reference to FIG. 3, the structure of the cooling unit 17 and its periphery is demonstrated. The cooling unit 17 is a unit in which a refrigeration circuit 21 is attached to a heat insulating unit base 20. The unit table 20 is formed to be slightly larger than the opening 11E formed in the ceiling wall 11D of the storage body 11, and is disposed on the ceiling wall 11D so as to close the opening 11E.

The refrigeration circuit 21 includes a compressor 22, a condenser 23, a condenser fan 24, an evaporator 25, an expansion valve (not shown), and the like. The compressor 22 may be an inverter compressor having a variable rotational speed, or may be a constant speed compressor having a constant rotational speed.
A filter (not shown) is provided on the front side of the condenser 23 to prevent dust in the air from adhering to the condenser 23 and reducing the condensation capacity. Further, a clogging thermistor 31 (see FIG. 4) for detecting clogging of the filter is attached to the refrigerant pipe of the condenser 23. The clogging thermistor 31 is an example of a condenser temperature sensor.

  The evaporator 25 is attached to the lower side of the unit table 20, and is accommodated in an air circulation path 28 constituted by a ceiling (the ceiling wall 11D and the unit table 20) and a duct portion 27 described below.

  The duct portion 27 forms an air circulation path 28 with the ceiling, and also functions as a drain pan that receives defrost water that is water in which frost attached to the evaporator 25 has melted. The duct portion 27 includes a substantially flat bottom wall 27A inclined downward toward the rear side, a side wall 27B rising upward from left and right edges of the bottom wall 27A, and a rear edge of the bottom wall 27A. It has a rear wall 27C that rises slightly upward.

  A circular suction port 27D for sucking air into the air circulation path 28 is formed in the front portion of the bottom wall 27A. The rear wall 27C is spaced forward from the rear wall 11F of the storage body 11, and an outlet 27E is formed between the rear wall 27C and the rear wall 11F of the storage body 11. The rear wall 27C is integrally formed with a drain groove 27F having a U-shaped cross section extending from the substantially horizontal center to the rear side. A drainage passage 11G is formed in the rear wall 11F of the storage body 11, and the drainage groove 27F has a rear end inserted into the drainage passage 11G. The defrost water received by the duct part 27 is discharged | emitted out of the store | warehouse | chamber via the drainage channel 11G from the drainage groove 27F.

The internal fan 29 is attached to the suction port 27D of the duct portion 27 from above. When the internal fan 29 rotates, the internal air is drawn into the air circulation path 28 from the suction port 27D, cooled by the evaporator 25, and blown out from the blowout port 27E.
The internal thermistor 30 (an example of the internal temperature sensor) is disposed between the internal fan 29 and the evaporator 25 in the air circulation path 28. The internal thermistor 30 detects the internal temperature and outputs it to the control unit 35. The internal thermistor 30 also serves as a defrosting thermistor during the defrosting operation.

  A defrost heater 32 (an example of a heating unit) is attached to the lower end of the cooling fin of the evaporator 25. The defrost heater 32 is for heating the evaporator 25 to defrost the evaporator 25. In the following description, defrosting is also referred to as defrost.

(2) Electrical configuration of refrigerator The electrical configuration of the refrigerator 1 will be described with reference to FIG. The refrigerator 1 includes a control unit 35. The control unit 35 is connected to the operation unit 19, the compressor 22, the internal fan 29, the condenser fan 24, the internal thermistor 30, the clogging thermistor 31, the ambient temperature thermistor 33, the defrost heater 32, and the like.

  The control unit 35 includes a CPU 35A, a ROM 35B, a RAM 35C, and the like. The control unit 35 controls each unit of the refrigerator 1 by executing a control program stored in the ROM 35B. The control unit 35 may include an ASIC (Application Specific Integrated Circuit), an FPGA (Field Programmable Gate Array), or the like instead of the CPU 35A or in addition to the CPU 35A.

(3) Operation Unit The operation unit 19 will be described with reference to FIG. The operation unit 19 includes a display device 40 (an example of a display unit), a plurality of operation buttons 41, an inspection lamp 42 (an example of a light emitting unit), a filter lamp 43, a defrosting lamp 44, and the like.

The display device 40 displays the current internal temperature, the target temperature in the internal storage, and the like. In addition, when an abnormality such as a high temperature abnormality described later occurs, the display device 40 displays an alarm number corresponding to the abnormality.
The plurality of operation buttons 41 are buttons for the user to perform various operations such as setting a target temperature. In the following description, the set target temperature is referred to as a set temperature.

  The inspection lamp 42 includes a translucent graphic indicating that the refrigerator 1 needs to be inspected and a character string “inspection”, and a light source such as an LED arranged behind the graphic and the character string. . The control unit 35 turns on the inspection lamp 42 when the abnormality of the refrigerator 1 is detected, and turns off the inspection lamp 42 when the inspection of the refrigerator 1 is performed and no abnormality is detected.

  The filter lamp 43 is a transparent or translucent graphic indicating that clogging of the filter provided on the front side of the condenser 23 has been detected, and a character string “filter”, and the graphic and the character string are arranged behind the graphic lamp and the character string. And a light source such as an LED. When the temperature detected by the clogging thermistor 31 is kept at a predetermined temperature or higher for a predetermined time or longer, the controller 35 assumes that the filter is clogged and turns on the filter lamp 43. When the control unit 35 assumes that the clogging has been eliminated, the control unit 35 turns off the filter lamp 43.

  The defrosting lamp 44 is arranged behind the figure and the character string, a transparent or translucent figure indicating that the evaporator 25 is being defrosted and a character string “defrosting” and the character string. And a light source such as an LED. The controller 35 turns on the defrosting lamp 44 when the defrosting operation is started, and turns off the defrosting lamp 44 when the defrosting operation is finished.

(4) Process Executed by Control Unit Here, the cooling operation and the high temperature abnormality notification process (an example of the notification process) among the processes executed by the control unit 35 will be described.

(4-1) Cooling Operation The cooling operation will be described with reference to FIG. In the cooling operation, the internal temperature is maintained within a predetermined cooling temperature range by switching the operation / stop of the compressor 22 and the condenser fan 24. The upper limit temperature of the cooling temperature range is, for example, a set temperature + 1.7K [Kelvin], and the lower limit temperature is a set temperature −2.0K. 1.7K and 2.0K are examples, and are not limited thereto.

  In the cooling operation, the control unit 35 operates the compressor 22, the condenser fan 24, and the internal fan 29, and stops the compressor 22 and the condenser fan 24 when the internal temperature decreases to the lower limit temperature. When these are stopped, the internal temperature gradually rises. The controller 35 restarts the operation of the compressor 22 and the condenser fan 24 when the internal temperature rises to the upper limit temperature of the cooling temperature range. By repeating this, the internal temperature is maintained within the cooling temperature range.

  For example, in FIG. 6, time T1 is a time when the refrigerator 1 is turned on. When the power is turned on, the control unit 35 operates the compressor 22, the condenser fan 24, and the internal fan 29. When these are operated, the internal temperature decreases. Time point T2 is a time point when the internal temperature is lowered to the lower limit temperature of the cooling temperature range. The controller 35 stops the compressor 22 and the condenser fan 24 when the internal temperature decreases to the lower limit temperature of the cooling temperature range. When these are stopped, the internal temperature rises. Time T3 is a time when the internal temperature rises to the upper limit temperature of the cooling temperature range. For this reason, the control unit 35 resumes the operation of the compressor 22 and the condenser fan 24 at time T3.

  If the operation of the compressor 22 and the condenser fan 24 is resumed at time T3, the internal temperature should decrease, but in the example shown in FIG. 6, some abnormality occurs in the refrigerator 1 between time T2 and time T3. The case where the inside temperature does not decrease even when the operation of the compressor 22 and the condenser fan 24 is restarted at time T3 is shown.

(4-2) High temperature abnormality notification process The high temperature abnormality notification process will be described with reference to FIG. In the present embodiment, a temperature that is 10K or more higher than the set temperature (in other words, a temperature that is 8.3K or more higher than the upper limit temperature) is defined as a high temperature. 10K is an example, and it can be determined as appropriate how many times higher than the set temperature is set as the high temperature. The high temperature abnormality notifying process is a process of notifying the user that a high temperature abnormality has occurred when a state where the internal temperature is higher than the set temperature by 10K or more (that is, a high temperature state) continues for two hours or more. 8.3K is an example of a predetermined temperature, and 2 hours is an example of a predetermined time.

  Here, the reason why the high temperature abnormality is not reported when the high temperature state continues for less than 2 hours even when the internal temperature becomes high (a state higher than the set temperature by 10K or more) is that the refrigerator 1 operates normally. This is because the insulated door 12 may be opened and the internal temperature may be temporarily high. For this reason, the control part 35 does not alert | report high temperature abnormality, when the state which the state continued even if the internal temperature became high temperature is less than 2 hours.

  The high temperature abnormality can be classified into a high temperature abnormality 1 (an example of the first type abnormality) and a high temperature abnormality 2 (an example of the second type abnormality) described below. The cause is different between the high temperature abnormality 1 and the high temperature abnormality 2. For this reason, the control part 35 distinguishes and alert | reports the high temperature abnormality 1 and the high temperature abnormality 2 in order to make it easy for the operator who maintains the refrigerator 1 to specify the cause of high temperature abnormality. In other words, the control unit 35 divides the high temperature abnormality into two and notifies it.

(A) High temperature abnormality 1
The high temperature abnormality 1 is an abnormality in which the internal temperature becomes high due to the compressor 22 being stopped. Possible causes for the compressor 22 to stop include failure of the compressor 22 itself, failure of the control board of the compressor 22, failure of a relay that turns on / off the power supply to the compressor 22, and the like.

  When the compressor 22 is in operation, the high-temperature and high-pressure refrigerant is sent from the compressor 22 to the condenser 23, so that the temperature of the condenser 23 (temperature detected by the clogging thermistor 31) is the ambient temperature of the refrigerator 1 ( Temperature detected by the ambient temperature thermistor 33). On the other hand, when the compressor 22 is stopped, the circulation of the refrigerant in the refrigeration circuit 21 is stopped, so the temperature of the refrigerant staying in the condenser 23 is lowered to a temperature close to the ambient temperature, and the condenser The difference between the temperature of 23 and the ambient temperature is reduced.

  For this reason, the control unit 35 continues the state where the internal temperature is higher than the set temperature by 10K or more for 2 hours, and the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is always 3K during the 2 hours. If it is less than (an example of a predetermined value), the high temperature abnormality 1 is notified that the compressor 22 has stopped. This will be specifically described below.

  In FIG. 6, time T6 is a time when the internal temperature drops to the lower limit temperature and the compressor 22 is stopped, and time T7 is a time when the internal temperature subsequently increases to the upper limit temperature. In the example shown in FIG. 6, it is assumed that the cause of the high temperature abnormality 1 occurs between time T6 and time T7. For this reason, even if the internal temperature rises to the upper limit temperature at time T7, the compressor 22 remains stopped, and the internal temperature rises even after time T7. At the time T8, the internal temperature reaches a temperature 10K higher than the set temperature. In the example shown in FIG. 6, the state in which the internal temperature is higher than the set temperature by 10K or more continues until time T9 when 2 hours have elapsed from time T8.

  In the example shown in FIG. 6, since the compressor 22 is stopped at the time point T6, the temperature of the condenser 23 decreases at the time point T6. The absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is 3K or less between time T6 and time T7, and the state where the absolute value of the difference is 3K or less continues until time T9. doing. That is, during the 2 hours from the time T8 to the time T9 (in other words, while the internal temperature is higher than the set temperature by 10K or more for 2 hours), the absolute value of the difference between them is always 3K or less. For this reason, the control unit 35 displays the alarm number of the high temperature abnormality 1 on the display device 40 at time T9.

  The above-mentioned 8.3K (predetermined temperature), 2 hours (predetermined time), and 3K (predetermined value) are examples. The predetermined temperature, the predetermined time, and the predetermined value can be appropriately determined.

(B) High temperature abnormality 2
The high temperature abnormality 2 is an abnormality in which the internal temperature becomes high despite the compressor 22 being operated. The reason why the internal temperature becomes high even though the compressor 22 is in operation is as follows: failure of components other than the compressor 22, output of abnormal internal temperature due to failure of the internal thermistor 30, refrigeration circuit 21. Severe usage conditions such as refrigerant leakage, use in a high temperature environment (an example of an installation environment), and frequent opening / closing of doors are conceivable.

In the case of the high temperature abnormality 2, since the compressor 22 is operated, the high-temperature and high-pressure refrigerant is sent from the compressor 22 to the condenser 23. For this reason, in the case of the high temperature abnormality 2, the difference between the temperature of the condenser 23 and the ambient temperature becomes large.
For this reason, the control unit 35 continues the state where the internal temperature is higher than the set temperature by 10K or more for 2 hours, and the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is temporarily during the 2 hours. However, if it is 3K or more, the high temperature abnormality 2 is notified that the compressor 22 is operating. This will be specifically described below.

  In FIG. 6, time T2 is a time when the internal temperature drops to the lower limit temperature and the compressor 22 is stopped, and time T3 is a time when the internal temperature subsequently rises to the upper limit temperature. In the example shown in FIG. 6, it is assumed that the cause of the high temperature abnormality 2 occurs between time T2 and time T3. For this reason, even if the internal temperature rises to the upper limit temperature at the time T3 and the operation of the compressor 22 is resumed, the internal temperature rises. At the time T4, the internal temperature reaches a temperature 10K higher than the set temperature. In the example shown in FIG. 6, the state in which the internal temperature is higher than the set temperature by 10K or more continues until time T5, which is the time when 2 hours have elapsed from time T4.

  In the example shown in FIG. 6, since the compressor 22 is stopped at the time point T2, the temperature of the condenser 23 decreases at the time point T2. And the absolute value of the difference of the temperature of the condenser 23 and ambient temperature is less than 3K between the time T2 and the time T3. However, since the operation of the compressor 22 is restarted at time T3, the temperature of the condenser 23 has increased from time T3, and the absolute value of the difference between time T4 and time T5 is approximately 3K or more. It has become. That is, during the 2 hours from the time T4 to the time T5 (in other words, while the internal temperature is higher than the set temperature by 10K or more for 2 hours), the absolute value of the difference between them is temporarily 3K. That's it. For this reason, the control part 35 displays the alarm number of the high temperature abnormality 2 on the display device 40 at time T5.

(4-3) Alarm number display and inspection lamp lighting When the control unit 35 displays a high temperature abnormality alarm number on the display device 40, the internal temperature and the high temperature abnormality alarm number are alternately displayed. . In that case, the control unit 35 turns on the inspection lamp 42 only while the alarm number is displayed in order to make it easy to understand whether the displayed information is the internal temperature or the alarm number.

  After displaying the alarm number, the control unit 35 ends the display of the alarm number and turns off the inspection lamp 42 when the internal temperature drops to the lower limit temperature of the cooling temperature range. This terminates the notification of the high temperature abnormality.

(5) Effect of Embodiment According to the refrigerator 1 according to the first embodiment, the high temperature abnormality is divided into the high temperature abnormality 1 and the high temperature abnormality 2 and is notified. For this reason, for example, in the case of the high temperature abnormality 1, the worker who performs maintenance does not have to inspect the components that cause the high temperature abnormality 2. For this reason, the time required for specifying the cause of the high temperature abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance. In addition, since the time required to identify the cause can be shortened, the work load on the operator can be reduced.

  Moreover, according to the refrigerator 1, when an operator prepares for arrangement of parts that may be repaired, by obtaining an alarm number from the user of the refrigerator 1 in advance, parts that may be repaired are obtained. You can narrow down. For this reason, preparation time can also be shortened.

  Moreover, according to the refrigerator 1, it can be judged from the temperature of the condenser 23, and ambient temperature whether the compressor 22 was drive | operated. For this reason, in the case of the refrigerator provided with the clogging thermistor 31 which detects the temperature of the condenser 23, and the ambient temperature thermistor 33 which detects ambient temperature, it is for confirming whether the compressor 22 was drive | operated. There is no need to provide new control components. For this reason, the cost for dividing a high temperature abnormality into two can be reduced.

  Moreover, according to the refrigerator 1, when the internal temperature falls to the lower limit temperature, the notification of the high temperature abnormality is terminated. If the internal temperature drops to the lower limit temperature, it can be said that the high temperature abnormality is surely eliminated. For this reason, according to the refrigerator 1, notification can be terminated when the high temperature abnormality is reliably resolved.

  Moreover, according to the refrigerator 1, since one display apparatus 40 is used for the display of the internal temperature and the display of the alarm number, a display unit for displaying the internal temperature and a display unit for displaying the alarm number are provided. Cost can be reduced compared with the case where it is provided separately.

  Further, according to the refrigerator 1, since the inspection lamp 42 is turned off when displaying the internal temperature, and the inspection lamp 42 is turned on when displaying the alarm number, an alarm number is displayed as to whether the internal temperature is displayed. It becomes easy to understand what is being done.

<Embodiment 2>
A second embodiment will be described with reference to FIG. The control unit 35 according to the second embodiment executes a low temperature abnormality notification process (an example of a notification process).

(1) Low temperature abnormality notification process The low temperature abnormality notification process will be described with reference to FIG. In the present embodiment, a temperature that is 5K or more lower than the set temperature (in other words, a temperature that is 3.0K or more lower than the lower limit temperature) is defined as a low temperature. 5K is an example, and it is possible to appropriately determine how many times the temperature lower than the set temperature is set as the low temperature. The low temperature abnormality notifying process is a process of notifying the user that a low temperature abnormality has occurred when a state where the internal temperature is 5K or more lower than the set temperature (ie, a low temperature state) continues for one hour or longer. 3.0K is an example of a predetermined temperature, and 1 hour is an example of a predetermined time.

  Here, the reason why the low temperature abnormality is not reported when the internal temperature is low (5K or more lower than the set temperature) and the state continues for less than 1 hour is that the internal temperature is generally lower than the set temperature. This is because the refrigerator 1 is considered to be operating normally if the duration of the state continues for less than 1 hour even when the state is lower than 5K. For this reason, the control part 35 does not alert | report a low-temperature abnormality, when the state for which the state continued was less than 1 hour, even if the internal temperature became 5K or more lower than preset temperature.

  The low temperature abnormality can be divided into a low temperature abnormality 1 (an example of the first type abnormality) and a low temperature abnormality 2 (an example of the second type abnormality) described below. Low temperature abnormality 1 and low temperature abnormality 2 have different causes. For this reason, the control part 35 distinguishes and alert | reports the low temperature abnormality 1 and the low temperature abnormality 2 in order to make it easy for the operator who maintains the refrigerator 1 to specify the cause of low temperature abnormality. In other words, the control unit 35 divides the low temperature abnormality into two and notifies it.

(A) Low temperature abnormality 1
Low temperature abnormality 1 is an abnormality in which the internal temperature becomes low even though the compressor 22 is stopped. Reasons for the internal temperature to become low despite the compressor 22 being stopped include abnormal internal temperature output due to a failure of the internal thermistor 30, use in a low temperature environment (an example of an installation environment), etc. Can be considered.

As described in the first embodiment, when the compressor 22 is stopped, the circulation of the refrigerant in the refrigeration circuit 21 is stopped. Therefore, the temperature of the refrigerant staying in the condenser 23 is lowered to a temperature close to the ambient temperature, The difference between the temperature of the condenser 23 and the ambient temperature is reduced.
For this reason, the control unit 35 continues the state where the internal temperature is 5K or more lower than the set temperature for 1 hour, and the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is always 3K during the 1 hour If it is less than (an example of the predetermined value), the low temperature abnormality 1 is notified that the compressor 22 has stopped. This will be specifically described below.

  In FIG. 7, time T1 is a time when the internal temperature rises to the upper limit temperature and the operation of the compressor 22 is started, and time T2 is a time when the internal temperature subsequently decreases to the lower limit temperature. In the example shown in FIG. 7, it is assumed that the cause of the low temperature abnormality 1 occurs between time points T1 and T2. For this reason, even if the compressor 22 stops at the time T2, the inside temperature has fallen. At the time T3, the internal temperature reaches a temperature 5K lower than the set temperature. In the example shown in FIG. 7, the state in which the internal temperature is 5K or more lower than the set temperature continues until time T4 when 1 hour has elapsed from time T3.

  In the example shown in FIG. 7, since the compressor 22 is stopped at the time T2, the temperature of the condenser 23 is decreased at the time T2. At time T3, the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is 3K or less. And the state where the absolute value of these differences is 3K or less continues until time T4. That is, during the 1 hour from the time T3 to the time T4 (in other words, while the state in which the internal temperature is 5K or more lower than the set temperature continues for 1 hour), the absolute value of the difference between them is always 3K or less. For this reason, the control part 35 displays the alarm number of the low temperature abnormality 1 on the display apparatus 40 at the time T4.

  In addition, 5K (predetermined temperature), 1 hour (predetermined time), and 3K (predetermined value) mentioned above are examples. The predetermined temperature, the predetermined time, and the predetermined value can be appropriately determined.

(B) Low temperature abnormality 2
The low temperature abnormality 2 is an abnormality in which the internal temperature becomes low because the compressor 22 has been operated. Possible causes of the low internal temperature due to the operation of the compressor 22 include failure of the control board of the compressor 22 and failure of a relay for turning on / off the current supply to the compressor 22.

  In the case of the low temperature abnormality 2, since the compressor 22 is operated, the high temperature and high pressure refrigerant is sent from the compressor 22 to the condenser 23. For this reason, when the compressor 22 is operated, the temperature of the condenser 23 (detected by the clogging thermistor 31) becomes higher than the ambient temperature (temperature detected by the ambient temperature thermistor 33). For this reason, in the case of the low temperature abnormality 2, the difference between the temperature of the condenser 23 and the ambient temperature increases.

  For this reason, the control unit 35 continues the state where the internal temperature is 5K or more lower than the set temperature for one hour, and the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is temporarily during that one hour. However, if the temperature is 3K or more, the low temperature abnormality 2 is notified that the compressor 22 is operating. This will be specifically described below.

  In FIG. 7, time T5 is a time when the internal temperature rises to the upper limit temperature and the operation of the compressor 22 is resumed, and time T6 is a time when the internal temperature subsequently decreases to the lower limit temperature. In the example shown in FIG. 7, it is assumed that the cause of the low temperature abnormality 2 occurs between time T5 and time T6. For this reason, even if the internal temperature falls to the lower limit temperature at time T6, the compressor 22 remains in operation, and the internal temperature is lowered even after time T6. At the time T7, the internal temperature reaches a temperature 5K lower than the set temperature. In the example illustrated in FIG. 7, the state in which the internal temperature is lower than the set temperature by 5K or more continues until time T8 when 1 hour has elapsed from time T7.

  In the example shown in FIG. 7, the operation of the compressor 22 is resumed at time T5, and the absolute value of the difference between the temperature of the condenser 23 and the ambient temperature is always 3K or more after time T5. That is, during the 1 hour from the time T7 to the time T8 (in other words, the state where the internal temperature is 5K or more lower than the set temperature continues for 1 hour), the absolute value of the difference between them is temporarily 3K. That's it. For this reason, the control unit 35 displays the alarm number of the low temperature abnormality 2 on the display device 40 at time T8.

(2) Alarm number display and inspection lamp lighting When the control unit 35 displays a low temperature abnormality alarm number on the display device 40, the inside temperature and the low temperature abnormality alarm number are alternately displayed. In that case, the control unit 35 turns on the inspection lamp 42 only while the alarm number is displayed in order to make it easy to understand whether the displayed information is the internal temperature or the alarm number.

  After displaying the alarm number, the control unit 35 ends the display of the alarm number and turns off the inspection lamp 42 when the internal temperature rises to the upper limit temperature of the cooling temperature range. This terminates the notification of the low temperature abnormality.

(3) Effect of Embodiment According to the refrigerator 1 according to the second embodiment, the low temperature abnormality is divided into the low temperature abnormality 1 and the low temperature abnormality 2 and is notified. For this reason, for example, in the case of the low temperature abnormality 1, the operator does not have to inspect the parts that cause the low temperature abnormality 2. For this reason, the time required for specifying the cause of the low temperature abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance.

  Further, according to the refrigerator 1 according to the second embodiment, when the internal temperature rises to the upper limit temperature, the low temperature abnormality notification is terminated. If the internal temperature rises to the upper limit temperature, it can be said that the low temperature abnormality has been reliably eliminated. For this reason, according to the refrigerator 1, the notification can be terminated when the low temperature abnormality is reliably resolved.

  Other effects of the refrigerator 1 according to the second embodiment are substantially the same as those of the first embodiment.

<Embodiment 3>
Embodiment 3 will be described with reference to FIG. The control unit 35 according to the third embodiment executes a defrost abnormality notification process (an example of a notification process) when the defrosting operation for melting the frost attached to the evaporator 25 is forcibly terminated.

(1) Defrosting operation Defrosting operation is demonstrated with reference to FIG. When the cooling operation described above is performed, frost adheres to the evaporator 25. For this reason, the control part 35 performs a defrost operation, when predetermined | prescribed defrost start conditions are satisfied. The predetermined defrosting start conditions are “a certain time has elapsed since the last defrosting operation was completed”, “predetermined time has been reached”, “defrosting was instructed by the user”, etc. is there. The defrosting start conditions can be determined as appropriate.

  When the predetermined defrosting start condition described above is satisfied, the control unit 35 defrosts the evaporator 25 by the heater defrost method. The heater defrosting method is a method of defrosting by heating the evaporator 25 by the defrosting heater 32. In the heater defrost method, the control unit 35 stops the compressor 22, the condenser fan 24, and the internal fan 29 and energizes the defrost heater 32 to heat the evaporator 25.

With reference to FIG. 8, the defrosting by a heater defrost system is demonstrated concretely. Time T1 is the time when the defrosting start condition is satisfied. For this reason, the control part 35 starts the defrost operation by a heater defrost system at the time T1 (an example of a defrost start process).
In the defrosting operation, the compressor 22 is stopped and the defrosting heater 32 is energized, so that the internal temperature rises. Time T2 is the time when the internal temperature detected by the internal thermistor 30 (in other words, the defrosting thermistor) rises to a predetermined heater defrost end temperature (an example of the defrost end temperature) after starting the defrosting operation. is there. When the internal temperature rises to the heater defrost end temperature, the controller 35 ends energization to the defrost heater 32 (an example of a defrost end process). However, the control unit 35 does not restart the operation of the compressor 22, the condenser fan 24, and the internal fan 29 immediately after draining the evaporator 25 even after the energization to the defrosting heater 32 is finished, and for 5 minutes. When elapses, these operations are resumed. This returns to the cooling operation.

(2) Forced termination of defrosting operation The forced termination of the defrosting operation will be described with reference to FIG. The control unit 35 forces the defrosting operation when the internal temperature does not rise to the heater defrosting end temperature even after 1 hour (an example of a fixed time) has elapsed since the start of the defrosting operation by the heater defrost method. finish.

  For example, time point T5 and time point T9 in FIG. 8 are times when one hour has elapsed since the start of the defrosting operation by the heater defrost method. At these times, the internal temperature is lower than the heater defrost end temperature. For this reason, the control unit 35 forcibly ends the defrosting operation at time T5 or time T9. When the defrosting operation is forcibly terminated, the control unit 35 ends energization of the defrosting heater 32 and waits for 5 minutes for draining, and then the compressor 22, the condenser fan 24 and the internal fan 29. Resume operation.

(3) Defrost abnormality notification process The defrost abnormality notification process is a process of notifying the user of a defrost abnormality when the defrosting by the heater defrost method is forcibly terminated.
The defrost abnormality can be divided into defrost abnormality 1 (an example of the first type abnormality) and defrost abnormality 2 (an example of the second type abnormality) described below. The causes of defrost abnormality 1 and defrost abnormality 2 are different. For this reason, the control part 35 distinguishes and alert | reports the defrost abnormality 1 and the defrost abnormality 2 in order to make it easy for the operator who maintains the refrigerator 1 to specify the cause of a defrost abnormality. In other words, the control unit 35 notifies the defrost abnormality in two parts.

(A) Defrost abnormality 1
Defrost abnormality 1 is an abnormality in which the internal temperature does not rise to the heater defrost end temperature due to the defrost heater 32 not being energized. Possible causes of deenergizing heater 32 not being energized include failure of defrosting heater 32, failure of a relay that turns on / off energization of defrosting heater 32, disconnection of a thermal fuse, and the like.

  When the defrosting heater 32 is not energized, the internal temperature does not increase. Therefore, the internal temperature when the defrosting operation is forcibly ended is usually a temperature obtained by subtracting 15K (an example of a predetermined temperature) from the heater defrost end temperature. It becomes as follows. For this reason, the control unit 35 assumes that the defrost heater 32 is not energized when the internal temperature when the defrost operation by the heater defrost method is forcibly terminated is equal to or lower than the temperature obtained by subtracting 15K from the heater defrost end temperature. Defrost abnormality 1 is notified. This will be specifically described below.

  In FIG. 8, time T4 is a time when a predetermined defrosting start condition is satisfied. For this reason, the control part 35 starts the defrost operation by a heater defrost system at the time T4. Time T5 is the time when 1 hour has elapsed from time T4. In the example shown in FIG. 8, it is assumed that the cause of the defrost abnormality 1 occurs at time T4. For this reason, in the example shown in FIG. 8, 1 hour has passed without the inside temperature rising to the heater defrost end temperature by not energizing the defrost heater 32. For this reason, the defrosting operation is forcibly terminated at time T5.

  In the example shown in FIG. 8, since the defrost heater 32 is not energized, the internal temperature when the defrost operation is forcibly terminated at time T5 is equal to or lower than the temperature obtained by subtracting 15K from the heater defrost end temperature. For this reason, the control unit 35 displays the alarm number of defrost abnormality 1 on the display device 40 at time T5.

  In addition, 15K (predetermined temperature) mentioned above is an example. The predetermined temperature can be determined as appropriate.

(B) Defrost abnormality 2
The defrost abnormality 2 is an abnormality in which the internal temperature does not rise to the heater defrost end temperature even though the defrost heater 32 is energized. The reason why the internal temperature did not rise to the heater defrost end temperature even though the defrosting heater 32 was energized was because of an abnormal internal temperature output due to the failure of the internal thermistor 30 and the opening / closing of the heat insulation door 12. The use situation such as the attachment of a large amount of frost to the evaporator 25 due to the above can be considered.

  In the defrost abnormality 2, since the defrost heater 32 is energized, the internal temperature rises to some extent. For this reason, normally, the internal temperature when the defrosting operation is forcibly ended is higher than the temperature obtained by subtracting 15K from the heater defrost end temperature. For this reason, the control part 35 presupposes that the defrost heater 32 was supplied with electricity when the internal temperature when forcedly ending the defrosting operation by the heater defrost method is higher than the temperature obtained by subtracting 15K from the heater defrost end temperature. Defrost abnormality 2 is notified. This will be specifically described below.

  In FIG. 8, time T8 is a time when a predetermined defrosting start condition is satisfied. For this reason, the control part 35 starts the defrost operation by a heater defrost system at the time T8. Time T9 is the time when 1 hour has elapsed from time T8. In the example shown in FIG. 8, it is assumed that the cause of the defrost abnormality 2 occurs between time T7 and time T8. For this reason, in the example shown in FIG. 8, 1 hour has passed without the inside temperature rising to the heater defrost end temperature. For this reason, the defrosting operation is forcibly terminated at time T9.

  In the example shown in FIG. 8, since the defrost heater 32 is energized, the internal temperature when the defrost operation is forcibly terminated at time T9 is lower than the heater defrost end temperature, but the heater defrost end temperature is 15K. Higher than reduced temperature. For this reason, the control part 35 displays the warning number of the defrost abnormality 2 on the display apparatus 40 at the time T9.

(4) Display of alarm number and lighting of inspection lamp When the control unit 35 displays the alarm number of the defrost abnormality on the display device 40, the controller 35 alternately displays the internal temperature and the alarm number of the defrost abnormality. In that case, the control unit 35 turns on the inspection lamp 42 only while the alarm number is displayed in order to make it easy to understand whether the displayed information is the internal temperature or the alarm number.

  After displaying the alarm number of the defrost abnormality, the control unit 35 ends the alarm number display and turns off the inspection lamp 42 when the upper button 41A of the operation unit 19 is pressed for 3 seconds or longer. This terminates the notification of the defrost abnormality. In the example shown in FIG. 8, the upper button 41A of the operation unit 19 is pressed for 3 seconds or longer at time T7. For this reason, the notification of the defrost abnormality is completed at time T7.

(5) Effects of the Embodiment According to the refrigerator 1 according to the third embodiment, the defrost abnormality is divided into the defrost abnormality 1 and the defrost abnormality 2 and is notified. For this reason, for example, in the case of the defrost abnormality 1, the operator does not have to inspect the parts that cause the defrost abnormality 2. For this reason, the time required for specifying the cause of the defrost abnormality can be shortened. As a result, it is possible to reduce the possibility of deterioration of stored items such as food due to the time required for completing the maintenance.

  Moreover, according to the refrigerator 1, it can be judged from an alarm number whether the defrost heater 32 was supplied with electricity. For this reason, it is not necessary to perform the operation | work for confirming whether the defrost heater 32 was supplied with electricity.

  Further, according to the refrigerator 1 according to the third embodiment, for example, an operator who has performed maintenance can operate the operation unit 19 to end the notification of the defrost abnormality. If the notification is not terminated when the maintenance is completed, the defrost abnormality remains notified even when the maintenance is completed, and the user of the refrigerator 1 may be confused. According to the refrigerator 1, since the notification of the defrost abnormality can be ended by operating the operation unit 19, it is possible to suppress the user of the refrigerator 1 from being confused.

Other effects of the refrigerator 1 according to the third embodiment are substantially the same as those of the first embodiment.
<Other embodiments>
The technology disclosed in the present specification is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope disclosed by the present specification.

  (1) In the above embodiment, the refrigerator 1 has been described as an example of the cooling storage. However, the cooling storage may be a freezer, a refrigerator with a refrigerator and a freezer, or a showcase. Also good.

  Here, in the third embodiment, the predetermined temperature for dividing the defrost abnormality into two is 15K. 15K can be applied to both refrigerators and freezers. For this reason, when the predetermined temperature is 15K, it is not necessary to separately develop the control program in the refrigerator and the freezer, and the development man-hours of the control program can be suppressed.

  (2) In the third embodiment, the defrosting operation is ended when the internal temperature detected by the internal thermistor 30 rises to the heater defrost end temperature, but the temperature of the evaporator 25 is detected separately from the internal thermistor 30. A thermistor (hereinafter referred to as a defrosting thermistor) is provided, and the defrosting operation may be terminated when the temperature detected by the defrosting thermistor rises to the heater defrost end temperature.

  (3) In the first embodiment, the case where the high temperature abnormality is notified by displaying the alarm number of high temperature abnormality 1 or the alarm number of high temperature abnormality 2 on the operation unit 19 has been described as an example. However, the notification method is limited to this. It can be determined as appropriate. For example, you may alert | report by sending an alarm number to the user (or service person) of the refrigerator 1 by an email. Moreover, you may alert | report by sounding an alarm buzzer. In that case, the buzzer sound may be different between the high temperature abnormality 1 and the high temperature abnormality 2. The same applies to the second and third embodiments.

  (4) In the said Embodiment 3, although the defrost heater 32 was demonstrated to the example as a heating part, a heating part is not limited to the defrost heater 32. FIG. For example, the heating unit may heat the evaporator 25 by supplying hot gas to the evaporator 25.

  (5) In the above embodiment, the case where the inspection lamp 42 is turned on to notify that the inspection of the refrigerator 1 is necessary has been described as an example, but the notification method is not limited thereto. For example, you may alert | report by a buzzer sound. When the internal temperature and the alarm number are alternately displayed on the display device 40, the buzzer may be sounded only while the alarm number is displayed.

DESCRIPTION OF SYMBOLS 1 ... Refrigerator (an example of a cooling storage), 11 ... Storage body, 12 ... Thermal insulation door (an example of an opening / closing door), 19 ... Operation part (an example of an alerting | reporting part), 21 ... Refrigerating circuit, 22 ... Compressor, 23 ... Condensation 25 ... evaporator, 30 ... internal thermistor (example of internal temperature sensor), 31 ... clogging thermistor (example of condenser temperature sensor), 32 ... defrost heater (example of heating unit), 33 ... ambient Temperature thermistor (an example of an ambient temperature sensor), 35 ... control unit, 40 ... a display device (an example of a display unit), 42 ... an inspection lamp (an example of a light emitting unit)

Claims (8)

A cold storage,
A storage body having an opening and closing door;
A refrigeration circuit having a compressor and a condenser;
An internal temperature sensor for detecting the internal temperature,
A condenser temperature sensor for detecting the temperature of the condenser;
An ambient temperature sensor for detecting the ambient temperature of the cooling storage;
An informing unit for informing the abnormality;
A control unit;
With
The controller is
A cooling operation in which the compressor is operated to cool the interior, and when the interior temperature detected by the interior temperature sensor falls to a predetermined lower limit temperature, the compressor is stopped, and then the interior temperature Cooling operation to resume the operation of the compressor when the temperature rises to a predetermined upper limit temperature,
A notification process for notifying the notification unit of an abnormality when a high temperature abnormality occurs, wherein a state where the internal temperature is higher than the upper limit temperature by a predetermined temperature or more continues for a predetermined time, and during that time, the condenser temperature sensor When the difference between the detected temperature and the temperature detected by the ambient temperature sensor is always less than a predetermined value, the first type abnormality is notified and the internal temperature is higher than the upper limit temperature by the predetermined temperature or more. Is continued for the predetermined time, and in the meantime, if the difference is temporarily greater than or equal to the predetermined value, a notification process for notifying the second type of abnormality,
Perform the cooling storage. The cooling storage according to claim 1,
The said control part is a cooling storage warehouse which complete | finishes alerting | reporting, if the internal temperature detected by the said internal temperature sensor falls to the said minimum temperature. A cold storage,
A storage body having an opening and closing door;
A refrigeration circuit having a compressor and a condenser;
An internal temperature sensor for detecting the internal temperature,
A condenser temperature sensor for detecting the temperature of the condenser;
An ambient temperature sensor for detecting the ambient temperature of the cooling storage;
An informing unit for informing the abnormality;
A control unit;
With
The controller is
A cooling operation in which the compressor is operated to cool the interior, and when the interior temperature detected by the interior temperature sensor falls to a predetermined lower limit temperature, the compressor is stopped, and then the interior temperature Cooling operation to resume the operation of the compressor when the temperature rises to a predetermined upper limit temperature,
A notification process for notifying the notification unit of an abnormality when a low temperature abnormality occurs, wherein a state where the internal temperature is lower than the lower limit temperature by a predetermined temperature or more continues for a predetermined time, and during that time, by the condenser temperature sensor When the difference between the detected temperature and the temperature detected by the ambient temperature sensor is always less than a predetermined value, the first type abnormality is notified and the internal temperature is lower than the lower limit temperature by the predetermined temperature or more. Is continued for the predetermined time, and in the meantime, if the difference is temporarily greater than or equal to the predetermined value, a notification process for notifying the second type of abnormality,
Perform the cooling storage. A cooling storehouse according to claim 3,
The said control part is a cooling storage warehouse which complete | finishes alerting | reporting, if the internal temperature detected by the said internal temperature sensor rises to the said upper limit temperature. A cold storage,
A storage body having an opening and closing door;
A refrigeration circuit having a compressor and an evaporator;
An internal temperature sensor for detecting the internal temperature,
A heating unit for heating the evaporator;
An informing unit for informing the abnormality;
A control unit;
With
The controller is
When a predetermined defrosting start condition is established, the compressor is stopped, and a defrosting start process for starting a defrosting operation for heating the evaporator by the heating unit;
A defrosting end process for terminating the defrosting operation when the internal temperature detected by the internal temperature sensor rises to a predetermined defrosting end temperature;
A forced termination process for forcibly terminating the defrosting operation when the internal temperature has not risen to the defrosting termination temperature even after a predetermined time has elapsed since the start of the defrosting operation;
In the notification process for notifying the notification unit of an abnormality when the forced termination process is executed, the internal temperature when the forced termination process is executed is lower than a temperature obtained by subtracting a predetermined temperature from the defrosting termination temperature. In such a case, the first type abnormality is notified, and the second type abnormality is notified when the internal temperature when the forced termination process is executed is equal to or higher than the temperature obtained by subtracting the predetermined temperature from the defrosting end temperature. Processing,
Perform the cooling storage. The cooling storage according to claim 5,
An operation unit for receiving an instruction to end the notification;
The said control part is a cooling storehouse which complete | finishes alerting | reporting, if the said instruction | indication is received by the said operation part. The cooling storage according to any one of claims 1 to 6,
The notification unit is a display unit that displays the internal temperature.
When the control unit notifies the first type abnormality or the second type abnormality, the control unit calculates the internal temperature and the first type abnormality alarm number or the second type abnormality alarm number. A cooling storage that is alternately displayed on the display unit. The cooling storage according to claim 7,
Provided with a light-emitting unit that notifies by lighting that inspection of the cooling storage is necessary,
The control unit turns off the light emitting unit when displaying the internal temperature, and turns on the light emitting unit when displaying the first type abnormality alarm number or the second type abnormality alarm number. , Cooling storage.

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