JPH1114207A - Backup operation unit for refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a matter to be reserved even when various units are abnormal. SOLUTION: A refrigerator including a coolant circuit comprising a compressor 1, a condenser 2, an electronic expansion valve 3, an evaporator 4 and a suction proportional valve 5 connected sequentially is further provided with a sensor 7 for detecting the suction air temperature of the evaporator 4, and a backup control means executing start/stop control of the compressor 1 upon occurrence of abnormality in the suction temperature sensor 7 based on an operating rate being set depending on the actual operating rate of the compressor 1 during cooling operation between the defrosting operation immediately before occurrence of abnormality and the following defrosting operation. Upon occurrence of abnormality in the suction temperature sensor 7 during operation of the refrigerator, start/stop control of the compressor 1 is executed based on an operating rate being set depending on the actual operating rate immediately before occurrence of abnormality which will be substantially equal to the operating rate at the time of occurring abnormality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backup operation device for a refrigeration system.

[0002]

2. Description of the Related Art Generally, a refrigerating apparatus (for example, a refrigerating apparatus for a refrigerating container or a refrigerating storage) has a refrigerant circuit in which a compressor, a condenser, an electronic expansion valve, an evaporator, and a suction proportional valve are sequentially connected. A variety of sensors such as a suction temperature sensor for detecting the temperature of the suction air of the evaporator, a heat exchange temperature sensor for detecting the temperature of the refrigerant of the evaporator, and a discharge temperature sensor for detecting the temperature of the discharge air of the evaporator are provided. It is configured. These sensors are necessary for the operation control of the refrigeration system.For example, the temperature information from the suction temperature sensor is used as data for the standard mode operation for maintaining the internal temperature at the set value. The temperature information from the heat exchange temperature sensor is used as data for determining the end time of the defrosting operation, and the temperature information from the blowout temperature sensor is used to determine the refrigerant flow rate by the electronic expansion valve so that the temperature inside the refrigerator does not greatly change. It is to be used as data for high freshness control for controlling and evaporating pressure control by a suction proportional valve.

[0003]

However, when an abnormality occurs in the various sensors, the electronic expansion valve, the suction proportional valve, and the like during operation of the refrigeration system having the above-described configuration, the internal temperature is set to a predetermined value. Problems such as the inability to maintain the defrosting operation, the inability to determine the end time of the defrosting operation, the inability to perform high freshness control, and the deterioration of the storage state of perishables and the like stored in the refrigerator. May occur.

[0004] Since the above-mentioned problems are fatal for a refrigerated container, it is necessary to give priority to protection of stored items when various equipment is abnormal.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to enable protection of stored items even when various devices are abnormal.

[0006]

In the basic configuration of the present invention (the invention of claim 1), as means for solving the above-mentioned problems, a compressor 1, a condenser 2, an electronic expansion valve 3, an evaporator 4, In a refrigerating apparatus provided with a refrigerant circuit in which suction proportional valves 5 are sequentially connected, a suction temperature sensor 7 for detecting a suction air temperature of the evaporator 4 and, when the suction temperature sensor 7 is abnormal, a filter immediately before the abnormality occurs. Backup operation control means for executing start / stop control of the compressor 1 based on an operation rate set according to an actual operation rate of the compressor 1 during a cooling operation from a frost operation to a next defrost operation is additionally provided. doing.

[0007] With the above-described configuration, when an abnormality occurs in the suction temperature sensor 7 during the operation of the refrigeration system and the internal temperature cannot be maintained at the set value, the time when the abnormality occurs is determined. The start / stop control of the compressor 1 is executed based on the operation rate set in accordance with the actual operation rate immediately before the occurrence of the abnormality, which hardly differs from the actual operation rate. Even if the control of the storage can no longer be performed, the storage items in the storage can be protected well.

As described in the second aspect of the present invention, a heat exchange temperature sensor 8 for detecting a refrigerant temperature of the evaporator 4 and, when the heat exchange temperature sensor 8 is abnormal, according to a defrosting operation time immediately before the occurrence of the abnormality. In the case where the defrosting operation control means for performing the defrosting operation is provided, even when the heat exchange temperature sensor 8 becomes abnormal during the operation of the refrigerating apparatus and the end time of the defrosting operation cannot be determined, an abnormality occurs. The defrosting operation end time can be determined based on the defrosting operation time immediately before the occurrence of the abnormality, which will be almost the same as the time, and the storage state of the storage object in the warehouse due to the continuation of the defrosting operation is prevented. be able to.

As in the third aspect of the present invention, an outlet temperature sensor 9 for detecting the outlet air temperature of the evaporator 4;
When the blowout temperature sensor 9 is abnormal, the high freshness control operation by the control of the electronic expansion valve 3 and the suction proportional valve 5 is stopped, and the compressor 1 is started based on the suction air temperature detected by the suction temperature sensor 7. When the operation switching control means for switching to the standard mode operation for performing the stop control is provided,
During the operation of the refrigeration system, even when an abnormality occurs in the blow-out temperature sensor 7 and the high-freshness control operation cannot be performed, the operation can be switched to the standard mode operation. Deterioration of the storage state of the object can be prevented.

As in the invention of claim 4, when the electronic expansion valve 3 is abnormal, the high freshness control operation by controlling the electronic expansion valve 3 and the suction proportional valve 5 is stopped and detected by the suction temperature sensor 7. When the operation switching control means for switching to the standard mode operation for controlling the start / stop of the compressor 1 based on the intake air temperature is provided, an abnormality occurs in the electronic expansion valve 3 during the operation of the refrigeration apparatus, and the high freshness control operation is performed. When the operation cannot be performed, it is possible to switch to the standard mode operation, and it is possible to prevent the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation.

As in the invention of claim 5, when the suction proportional valve 5 is abnormal, the high freshness control operation by the control of the suction proportional valve 5 and the electronic expansion valve 3 is stopped and detected by the suction temperature sensor 7. If the operation switching control means for switching to the standard mode operation for starting and stopping the compressor 1 based on the suction air temperature is provided, an abnormality occurs in the suction proportional valve 5 during the operation of the refrigeration system, and the high freshness control is performed. Even when the operation cannot be performed, the operation can be switched to the standard mode operation, and it is possible to prevent the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

This refrigerating apparatus is used for a refrigerating container or a refrigerating storage. As shown in FIG. 1, a compressor 1, a condenser 2, an electronic expansion valve 3, and an evaporator 4 are provided.
And a refrigerant circuit in which suction proportional valves 5 are sequentially connected. Reference numeral 6 denotes a fan for sending air in the refrigerator to the evaporator 5 and blowing out cool air cooled by the evaporator 5 into the refrigerator.

The refrigeration system includes the evaporator 4
A suction temperature sensor 7 for detecting the temperature of the suction air, a heat exchange temperature sensor 8 for detecting the temperature of the refrigerant in the evaporator 4,
An outlet temperature sensor 9 for detecting the outlet air temperature of the evaporator 4 is additionally provided. Temperature information from these sensors 7 to 9 is input to the controller 10 and used as data for various operation controls. It is to be done. Reference numeral 11 denotes an alarm buzzer.

That is, the controller 10 has a function of executing a standard mode operation for controlling start / stop of the compressor 1 based on the suction air temperature detected by the suction temperature sensor 7, and a function of the heat exchange sensor 8. A function of executing a defrosting operation based on the detected refrigerant temperature of the evaporator 4,
A function of executing a refrigerant flow rate control and an evaporation pressure control (that is, a high freshness control operation) by the electronic expansion valve 3 and the suction proportional valve 5 based on the blown air temperature detected by the blowout temperature sensor 9. I have.

When the suction temperature sensor 7 is abnormal, the controller 10 sets the controller according to the actual operation rate of the compressor 1 during the cooling operation from the defrosting operation immediately before the occurrence of the abnormality to the next defrosting operation. A function as backup operation control means for executing the operation of the compressor 1 based on the operation rate to be performed, and when the heat exchange temperature sensor 8 is abnormal, the defrost operation is performed according to the defrost operation time immediately before the occurrence of the abnormality. When the blowout temperature sensor 8, the electronic expansion valve 3 or the suction proportional valve 5 is abnormal, the high freshness control operation by controlling the electronic expansion valve 3 and the suction proportional valve 5 is stopped. As operation switching control means for switching to a standard mode operation for performing start / stop control of the compressor 1 based on the suction air temperature detected by the suction temperature sensor 7. And it has a door.

As shown in FIG. 3, the actual operation rate Tr of the compressor 1 is determined during the cooling operation from the defrosting operation to the next defrosting operation (in other words, during the defrost cycle Ta). ON time of T _1, T _2, is calculated as the ratio of the integrated value of T ₃ · · Tn.

That is, Tr = (T ₁ + T ₂ + T ₃ +... T
n) / Ta, and the actual operation rate Tr updates the previous data every time the defrosting operation is completed. If there is a stop, abnormal stop, or forced defrost during the defrost cycle, it is invalid. Also, 1
The actual operation rate before the second defrosting operation is performed (ie,
(Initial value) Tr = 50%.

The actual operation rate Tr obtained as described above
The operation rate of the backup operation is set based on.

That is, in the backup operation, as shown in FIG. 4, one cycle is about 10 minutes, and when Tr <30%, the operation is stopped for 8 minutes and then for 2 minutes, and when 30% ≦ Tr <40%, the operation is performed for 7 minutes. 3 minutes after stopping for 3 minutes, and when 40% ≦ Tr <50%, 4 minutes after stopping for 6 minutes, 50% ≦ Tr <60%
In the case of, operation is performed for 5 minutes after stopping for 5 minutes, and 60% ≦ Tr <70
%, The motor is stopped for 6 minutes after stopping for 4 minutes, and when 70% ≦ Tr, the motor is operated for 7 minutes after stopping for 3 minutes.

The defrosting operation time Tdef updates the previous data at the end of defrosting. Note that the first defrosting time (that is, the initial value) Tdef = 30 minutes.

Next, a backup operation control in the refrigeration apparatus according to the present embodiment will be described with reference to a flowchart shown in FIG.

[0023] The suction temperature sensor 7 in step S ₁
Abnormalities of whether caused determination is made, if a positive result is obtained in this, the process proceeds to step S _2, with start-stop control of the compressor 1 is performed based on the set operation ratio by the method described above , the alarm buzzer 11 goes to step S ₉
Is sounded to notify the user of the occurrence of the abnormality. Therefore, the start / stop control of the compressor 1 is executed based on the operation rate set in accordance with the actual operation rate Tr immediately before the occurrence of the abnormality, which hardly differs from the time of occurrence of the abnormality. Can be satisfactorily protected, and the user can confirm the occurrence of abnormality by the alarm buzzer 11.

[0024] When a negative determination is made in step S ₁ is abnormality in the heat exchanger temperature sensor 8 occurs whether the determination in step S ₃ is made, if a positive result is obtained in this, the process proceeds to step S _4, with the defrosting operation from the previous defrosting time Tdef is executed, is sounded alarm buzzer 11 proceeds to step S _9, notifies the abnormality to the user. Therefore, the end time of the defrosting operation can be determined based on the defrosting time Tdef immediately before the occurrence of the abnormality, which will be almost the same as the time of occurrence of the abnormality, and the storage state of the storage items in the refrigerator due to the continuation of the defrosting operation The deterioration can be prevented, and the user can confirm the occurrence of the abnormality by the alarm buzzer 11.

If a negative determination is made in step S ₃ , it is determined in step S ₅ whether an abnormality has occurred in the blowout temperature sensor 9. If an affirmative determination is made here, the process proceeds to step S ₈ , The high freshness control operation by the control of the electronic expansion valve 3 and the suction proportional valve 5 is stopped, and the mode is switched to a standard mode operation in which the start / stop control of the compressor 1 is performed based on the suction air temperature detected by the suction temperature sensor 7. together is, is sounding the warning buzzer 11 proceeds to step S _9, notifies the abnormality to the user. Therefore, even when the blowout temperature sensor 9 becomes abnormal and the high-freshness control operation cannot be performed, the operation can be switched to the standard mode operation. Can be prevented, and the user can set the alarm buzzer 11
Can confirm the occurrence of an abnormality.

[0026] If a negative determination in step S _5, a determination is made whether abnormality in the electronic expansion valve 3 in step S ₆ has occurred, if a positive result is obtained in this,
The process proceeds to step S _8, the electronic expansion valve 3 and the suction proportional valve 5 controlled by start-stop control of the compressor 1 based on the intake air temperature detected by the suction temperature sensor 7 stops the high freshness control operation with is switched to standard mode operation for performing an alarm buzzer 1 proceeds to step S ₉
1 is sounded to notify the user of the occurrence of an abnormality. Therefore,
Even when the electronic expansion valve 3 becomes abnormal and the high freshness control operation cannot be performed, the mode can be switched to the standard mode operation, thereby preventing the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation. The alarm buzzer 11 allows the user to confirm the occurrence of an abnormality.

[0027] If a negative determination in step S _6, a determination is made whether abnormality in the intake proportional valve 5 has occurred in step S _7, when a positive result is obtained in this,
The process proceeds to step S _8, the electronic expansion valve 3 and the suction proportional valve 5 controlled by start-stop control of the compressor 1 based on the intake air temperature detected by the suction temperature sensor 7 stops the high freshness control operation with is switched to standard mode operation for performing an alarm buzzer 1 proceeds to step S ₉
1 is sounded to notify the user of the occurrence of an abnormality. Therefore,
Even if the suction proportional valve 5 becomes abnormal and the high freshness control operation cannot be performed, it is possible to switch to the standard mode operation, thereby preventing the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation. The alarm buzzer 11 allows the user to confirm the occurrence of an abnormality.

[0028] When a negative determination is made in step S _7, all sensors, 7-9, together because abnormality in the electronic expansion valve 3 and the suction proportional valve 5 has not occurred continues the normal operation, steps and return to S ₁ to monitor the occurrence of abnormality.

[0029]

According to the invention of the present application (the invention of claim 1),
In a refrigerating apparatus including a refrigerant circuit in which a compressor 1, a condenser 2, an electronic expansion valve 3, an evaporator 4, and a suction proportional valve 5 are sequentially connected, a suction temperature sensor for detecting a suction air temperature of the evaporator 4. 7, when the suction temperature sensor 7 is abnormal, based on an operation rate set according to the actual operation rate of the compressor 1 during the cooling operation from the defrosting operation immediately before the occurrence of the abnormality to the next defrosting operation. Backup operation control means for executing start / stop control of the compressor 1 is additionally provided, and during operation of the refrigeration system, an abnormality occurs in the suction temperature sensor 7 so that the internal temperature cannot be maintained at the set value. In this case, the start / stop control of the compressor 1 is performed based on the operation rate set according to the actual operation rate immediately before the occurrence of the abnormality, which will be almost the same as the time of occurrence of the abnormality. Abnormality of temperature sensor 7 Even when no longer more able to control the-compartment air temperature, an excellent effect that it is possible to satisfactorily protect the internal storage thereof.

As described in the second aspect of the present invention, the heat exchange temperature sensor 8 for detecting the refrigerant temperature of the evaporator 4 and, when the heat exchange temperature sensor 8 is abnormal, according to the defrosting operation time immediately before the occurrence of the abnormality. In the case where the defrosting operation control means for performing the defrosting operation is provided, even when the heat exchange temperature sensor 8 becomes abnormal during the operation of the refrigerating apparatus and the end time of the defrosting operation cannot be determined, an abnormality occurs. The defrosting operation end time can be determined based on the defrosting operation time immediately before the occurrence of the abnormality, which will be almost the same as the time, and the storage state of the storage object in the warehouse due to the continuation of the defrosting operation is prevented. be able to.

As in the third aspect of the present invention, an outlet temperature sensor 9 for detecting the outlet air temperature of the evaporator 4;
When the blowout temperature sensor 9 is abnormal, the high freshness control operation by the control of the electronic expansion valve 3 and the suction proportional valve 5 is stopped, and the compressor 1 is started based on the suction air temperature detected by the suction temperature sensor 7. When the operation switching control means for switching to the standard mode operation for performing the stop control is provided,
During the operation of the refrigeration system, even when an abnormality occurs in the blow-out temperature sensor 7 and the high-freshness control operation cannot be performed, the operation can be switched to the standard mode operation. Deterioration of the storage state of the object can be prevented.

As described in the fourth aspect of the invention, when the electronic expansion valve 3 is abnormal, the high freshness control operation by the control of the electronic expansion valve 3 and the suction proportional valve 5 is stopped and detected by the suction temperature sensor 7. When the operation switching control means for switching to the standard mode operation for controlling the start / stop of the compressor 1 based on the intake air temperature is provided, an abnormality occurs in the electronic expansion valve 3 during the operation of the refrigeration apparatus, and the high freshness control operation is performed. When the operation cannot be performed, it is possible to switch to the standard mode operation, and it is possible to prevent the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation.

When the suction proportional valve 5 is abnormal, the high freshness control operation by the control of the suction proportional valve 5 and the electronic expansion valve 3 is stopped and detected by the suction temperature sensor 7. If the operation switching control means for switching to the standard mode operation for starting and stopping the compressor 1 based on the suction air temperature is provided, an abnormality occurs in the suction proportional valve 5 during the operation of the refrigeration system, and the high freshness control is performed. Even when the operation cannot be performed, the operation can be switched to the standard mode operation, and it is possible to prevent the storage state of the storage object from being deteriorated due to the inability to perform the high freshness control operation.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of a refrigeration apparatus according to an embodiment of the present invention.

FIG. 2 is a flowchart showing backup operation control in the refrigeration apparatus according to the embodiment of the present invention.

FIG. 3 is an explanatory diagram for explaining a method of calculating an actual operation rate of the compressor in the refrigeration apparatus according to the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing a setting example of a compressor operation rate during a backup operation in the refrigeration apparatus according to the embodiment of the present invention.

[Explanation of symbols]

1 is a compressor, 2 is a condenser, 3 is an electronic expansion valve, 4 is an evaporator, 5 is a suction proportional valve, 7 is a suction temperature sensor, 8 is a heat exchange temperature sensor, 9 is an outlet temperature sensor, 10 is a controller, 11 is an alarm buzzer.

Claims (5)

[Claims] 1. A refrigerating apparatus having a refrigerant circuit in which a compressor (1), a condenser (2), an electronic expansion valve (3), an evaporator (4) and a suction proportional valve (5) are sequentially connected. A suction temperature sensor (7) for detecting a suction air temperature of the evaporator (4); and, when the suction temperature sensor (7) is abnormal, during a cooling operation from a defrosting operation immediately before the occurrence of the abnormality to a defrosting operation. Backup operation control means for executing start / stop control of the compressor (1) based on an operation rate set in accordance with an actual operation rate of the compressor (1). Driving device. 2. A heat exchange temperature sensor (8) for detecting a refrigerant temperature of the evaporator (4), and the heat exchange temperature sensor (8).
2. The backup operation device for a refrigeration system according to claim 1, further comprising a defrosting operation control means for executing a defrosting operation in accordance with the defrosting operation time immediately before the occurrence of the abnormality. 3. An outlet temperature sensor (9) for detecting an outlet air temperature of the evaporator (4), and the electronic expansion valve (3) and the suction proportional valve (5) when the outlet temperature sensor (9) is abnormal. Operation switching control means for stopping the high freshness control operation by the control of the above and switching to a standard mode operation for starting and stopping control of the compressor (1) based on the suction air temperature detected by the suction temperature sensor. The backup operation device for a refrigeration system according to any one of claims 1 and 2, characterized in that: 4. When the electronic expansion valve (3) is abnormal, a high freshness control operation by controlling the electronic expansion valve (3) and the suction proportional valve (5) is stopped and detected by the suction temperature sensor (7). 4. An operation switching control means for switching to a standard mode operation for performing start / stop control of the compressor (1) based on the suction air temperature. Refrigeration equipment backup operation device. 5. When the suction proportional valve (5) is abnormal, the high freshness control operation by controlling the suction proportional valve (5) and the electronic expansion valve (3) is stopped and detected by the suction temperature sensor (7). An operation switching control means for switching to a standard mode operation for performing start / stop control of the compressor (1) based on the suction air temperature is provided. A backup operation device of the refrigeration device according to claim 1.