JP2017053586A - Refrigeration system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration system capable of automatically adjusting an operation of a showcase by appropriately determining an abnormality of the showcase.SOLUTION: In a refrigeration system, a refrigerant circuit is constituted by a compressor 10, a condenser, indoor expansion valves 17 and evaporators, and a plurality of showcases 3 cooled by the evaporators are provided. The refrigeration system includes a control section 31 for controlling the capacity of the compressor 10 on the basis of low-pressure side pressure and set pressure of the compressor 10 and changing the set pressure on the basis of a deviation of a temperature of the showcase 3 from a set temperature in a first cycle. The control section 31 calculates a system deviation integration value by integrating the deviation obtained in the first cycle in a range of a second cycle longer than the first cycle, and determines an abnormality of the system when the system deviation integration value exceeds a preset system management value. The control section 31 performs automatic adjustment to correct the abnormality of the system.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a refrigeration system, and more particularly, to a refrigeration system capable of automatically adjusting an operation of a showcase by appropriately judging an abnormality of the showcase.

  Conventionally, monitoring and management means for refrigeration equipment installed in supermarkets and convenience stores, etc., as a means of judging equipment abnormalities, the temperature inside the cabinet is detected by a detector such as a temperature sensor attached to the showcase or refrigerator compartment. It was common to measure and detect that the internal temperature was abnormal, and to issue an alarm with a lamp or buzzer.

  As a refrigeration system that performs such monitoring, conventionally, for example, the temperature of various freezing facilities such as a freezer / refrigerator showcase, a freezer / refrigerator, a refrigerator installed in a store such as a supermarket, and the measured temperature The operating status of the refrigeration equipment by comparing the internal average temperature, maximum internal temperature, minimum internal temperature, internal temperature setting, internal average temperature allowable temperature difference, internal maximum / minimum temperature allowable temperature difference Has been disclosed (see, for example, Patent Document 1).

JP-A-8-061814

However, in the technique described in Patent Document 1, the average temperature inside the cabinet is used as a management index, but this average temperature inside the cabinet is affected by the measurement period. Therefore, there is a problem that it is necessary to set the average temperature inside the cabinet, the maximum temperature inside the cabinet, and the minimum temperature inside the cabinet for each refrigeration facility such as the target refrigeration / refrigeration showcase, refrigeration / refrigerator, and refrigerator. ing.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigeration system that can appropriately determine an abnormality of a showcase and automatically adjust the operation of the showcase. is there.

  In order to achieve the above object, a refrigeration system according to the present invention includes a refrigerant circuit including a compressor, a condenser, an expansion valve, and an evaporator, and includes a plurality of cooling spaces that are cooled by the evaporator, A control unit that controls the capacity of the compressor based on the low-pressure side pressure and the set pressure of the compressor, and changes the set pressure based on the deviation between the temperature of the cooled space and the set temperature in the first period. In the refrigeration system, the control unit obtains a system deviation integrated value by integrating the deviations acquired in the first period in a range of a second period longer than the first period, and the system deviation When the integrated value exceeds a preset system management value, and the system deviation integrated value exceeds a preset system management value, it is determined that the system is abnormal. Characterized by automatic adjustment so as to eliminate the beam abnormality.

  Further, the present invention is characterized in that, in the above configuration, the second period is set within a period from when the pull-down operation after the defrost operation is completed to when the next defrost operation is started.

  Moreover, this invention is the said structure. WHEREIN: The said control part is the range of the 3rd period longer than the said 1st period and below a 2nd period, for every said to-be-cooled space acquired by the said 1st period. The individual deviation is integrated to obtain an individual deviation integrated value, and when the individual deviation integrated value exceeds a preset individual management value, it is determined that the cooling space is abnormal, and the control unit It is characterized by automatic adjustment so as to eliminate the abnormal space.

  Further, the present invention is characterized in that, in the above configuration, the automatic adjustment by the control unit is performed by adjusting the degree of superheat.

  Moreover, the present invention is characterized in that, in the above configuration, the automatic adjustment by the control unit is performed by adjusting an opening of an electromagnetic valve that adjusts an amount of refrigerant sent to the evaporator.

  Further, the present invention is characterized in that, in the above configuration, the automatic adjustment by the control unit is performed by adjusting a rotation amount of an indoor fan that blows air to the evaporator.

  Further, according to the present invention, in the configuration described above, even when the control unit determines that the cooled space is abnormal and automatically adjusts to eliminate the cooled space abnormality, the abnormality of the cooled space is resolved. If not, a notification unit for notifying that effect is provided.

  According to the present invention, the individual deviation is obtained by integrating the deviations for each space to be cooled acquired in the first cycle in the range of the third cycle longer than the first cycle and less than or equal to the second cycle. If the individual deviation exceeds the preset individual management value, it is determined that the cooling space is abnormal, and the control unit automatically adjusts to eliminate the cooling space abnormality. When there is an abnormality in the space to be cooled, the operation of the space to be cooled can be properly returned to normal.

1 is a circuit diagram of a refrigeration cycle showing an embodiment of a refrigeration system according to the present invention. It is a block diagram which shows the controller in this embodiment. It is explanatory drawing which shows the temperature control of the showcase in this embodiment. It is explanatory drawing which shows the example of the fluctuation | variation of the deviation temperature e in this embodiment. It is explanatory drawing which shows the example of the fluctuation | variation of the system deviation integrated value e 'in this embodiment. It is explanatory drawing which shows the example of the fluctuation | variation of the individual deviation e''n for every showcase in this embodiment. It is explanatory drawing which shows the parameter | index of the whole system and the state for every showcase based on the relationship between system deviation integrated value e 'and a system management value in this embodiment, and the relationship between an individual deviation and an individual management value. It is a flowchart which shows the control operation of the state judgment of each showcase in this embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a circuit diagram of a refrigeration cycle showing an embodiment of a refrigeration system according to the present invention.
The refrigeration system includes a refrigerator 1 installed outdoors and an indoor unit 2 installed in a store facility such as a convenience store or a supermarket. The indoor unit 2 is provided with a plurality of showcases 3 as cooled spaces.

The refrigerator 1 includes, for example, an inverter-type compressor 10 whose output can be varied, and is configured so that the output of the compressor 10 can be finely adjusted.
The refrigerator 1 includes a condenser 11 and an outdoor fan 12.

The showcase 3 of the indoor unit 2 includes an evaporator 15, an indoor fan 16, an indoor expansion valve 17, and an indoor electric valve 18.
Then, the refrigerant sent from the compressor 10 via the condenser 11 is sent to the evaporator 15 via the refrigerant pipe 19 via the indoor electric valve 18 and the indoor expansion valve 17 of the indoor unit 2, and again, The cycle is returned to the compressor 10 via the refrigerant pipe 19.

Further, a low pressure sensor 20 for detecting the refrigerant pressure flowing into the compressor 10 is provided on the refrigerant inflow side of the compressor 10 of the refrigerator 1, and the compressor 10 A high pressure sensor 21 is provided for detecting the refrigerant pressure to be discharged. Furthermore, a discharge temperature sensor 22 that detects the temperature of the refrigerant discharged from the compressor 10 is provided on the discharge side of the compressor 10.
An outside air temperature sensor 23 that detects the outside air temperature is provided outside the refrigerator 1.

  The showcase 3 is provided with an internal temperature sensor 24 that detects the internal temperature of the showcase 3. The showcase 3 is provided with an inlet temperature sensor 25 that detects the refrigerant temperature on the inflow side of the evaporator 15 of the showcase 3 and an outlet temperature sensor 26 that detects the refrigerant temperature on the outflow side of the evaporator 15.

In the present embodiment, an integrated controller 30 is provided in the refrigeration system.
FIG. 2 is a block diagram showing a control configuration of the refrigeration system of the present invention. As shown in FIG. 2, the integrated controller 30 includes a control unit 31 for performing predetermined control and arithmetic processing collectively, a storage unit 32 for storing predetermined information, and a notification unit 33. Yes.
The control unit 31 includes a low-pressure sensor 20 for the refrigerator 1, a high-pressure sensor 21, a discharge temperature sensor 22, a refrigerator information acquisition unit 34 that acquires information from the outside air temperature sensor 23, and an internal temperature sensor 24 for the showcase 3, And a showcase information acquisition unit 35 that acquires information from the inlet temperature sensor 25 and the outlet temperature sensor 26, and the control unit 31 acquires the information acquired by the refrigerator information acquisition unit 34 and the showcase information acquisition unit 35. Is configured to determine the status of the system.
Furthermore, the control unit 31 includes a setting condition output unit 37 that determines a system state, sets a system operating condition based on the determination result, and outputs the system operating condition to the refrigerator 1 and the showcase 3. .
The storage unit 32 includes a history storage unit 36. For example, information such as a system management value and an individual management value described later is stored in the storage unit 32.

The refrigerator 1 includes a refrigerator control unit 38. The refrigerator 1 includes a refrigerator output unit 40 that outputs detection values from the low pressure sensor 20, the high pressure sensor 21, the discharge temperature sensor 22, and the outside air temperature sensor 23.
In addition, the refrigerator control unit 38 sends the detection values of the low pressure sensor 20, the high pressure sensor 21, the discharge temperature sensor 22 and the outside air temperature sensor 23 output from the refrigerator output unit 40 to the refrigerator information acquisition unit 34 of the integrated controller 30. Configured to send.
The refrigerator control unit 38 is based on the detection values output from the low pressure sensor 20, the high pressure sensor 21, the discharge temperature sensor 22 and the outside air temperature sensor 23 of the refrigerator output unit 40 and the setting conditions sent from the setting condition output unit 37. The operation of the compressor 10 and the outdoor fan 12 is controlled.

The showcase 3 includes a showcase control unit 39. The showcase 3 includes a showcase output unit 41 that outputs values detected by the internal temperature sensor 24, the inlet temperature sensor 25, and the outlet temperature sensor 26.
Further, the showcase control unit 39 sends the detected values of the internal temperature sensor 24, the inlet temperature sensor 25, and the outlet temperature sensor 26 output from the showcase output unit 41 to the showcase information acquisition unit 35 of the integrated controller. It is configured.
The showcase control unit 39 is based on the detection values output from the interior temperature sensor 24, the inlet temperature sensor 25 and the outlet temperature sensor 26 of the showcase output unit 41 and the setting conditions sent from the setting condition output unit 37. The operation of the indoor fan 16 and the indoor expansion valve 17 is controlled.

FIG. 3 is an explanatory diagram showing temperature control of the showcase 3. As shown in FIG. 3, in the thermocycle operation period excluding the period from the start of the defrost operation to the end of the pull-down operation, the refrigerator information acquisition unit 34 of the control unit 31 includes the refrigerator control unit 38. From the low-pressure sensor 20, the high-pressure sensor 21, the discharge temperature sensor 22, and the outside air temperature sensor 23 of the refrigerator 1, and the showcase information acquisition unit 35 receives the storage of the showcase 3 from the showcase control unit 39. Detection values of the inner temperature sensor 24, the inlet temperature sensor 25, and the outlet temperature sensor 26 are acquired.
Then, the control unit 31 determines system information based on each of the detection values described above, sets the system operating condition based on the determination result, and sets the refrigerator control unit 38 and the show by the setting condition output unit 37. The data is sent to the case control unit 39. The refrigerator control unit 38 and the showcase control unit 39 are based on the setting condition sent from the setting condition output unit 37 so that the internal temperature of the showcase 3 becomes the set temperature. The indoor fan 16 and each indoor expansion valve 17 are driven and controlled.

In the present embodiment, the showcase information acquisition unit 35 of the control unit 31 basically calculates the set temperature of the showcase 3 connected to the same refrigerant pipe 19 and the internal temperature detected by the internal temperature sensor 24. get.
The showcase information acquisition unit 35 acquires the internal temperature of the showcase 3 by the internal temperature sensor 24 at a predetermined cycle such as an interval of 10 seconds.
The control unit 31 obtains the moving average temperature TP for each first period based on the acquired temperature information. Here, the first period can be arbitrarily set, and is set to 15 minutes, for example. Moreover, the reason why the moving average temperature TP is obtained is to remove a temperature change due to a disturbance, for example, when the door of the showcase 3 is opened to display a product.

Then, the control unit 31 calculates a deviation temperature e (e = TPA−TS) that is a difference between the moving average temperature TP and the set temperature TS.
FIG. 4 is an explanatory diagram showing an example of the variation of the deviation temperature e. As shown in FIG. 4, since the deviation temperature e is for calculating the moving average temperature for 15 minutes, the fluctuation of the deviation temperature e is considerably small.
Then, the control unit 31 controls to change the set pressure on the low pressure side of the compressor 10 based on the deviation temperature e.
This deviation temperature e is obtained for each showcase 3.

Normally, the deviation temperature e fluctuates within a small temperature range of about ± 1 ° C. or ± 2 ° C. with respect to the set temperature, as shown in FIG. It is difficult to judge abnormalities.
Therefore, in the present embodiment, the control unit 31 has a second period longer than the first period, and, as shown in the following formula, the control unit 31 integrates the deviation temperature e in each showcase 3 described above for each showcase 3. An individual deviation e′x is calculated.
e′1 = deviation temperature integrated value e′1 + deviation temperature e1 of the previous cycle
e′2 = deviation temperature integrated value e′2 + preceding temperature e2 of the previous cycle
Here, the second cycle is a cycle that can be arbitrarily set within the time from the end of the pull-down operation after the defrosting of the showcase 3 to the start of the defrosting. For example, it can be set arbitrarily such as 1 hour or 2 hours, and is the maximum time from the end of pull-down operation to the start of defrost.

Further, as shown in the following equation, the control unit 31 obtains a system deviation E and a system deviation integrated value E ′ obtained by integrating the deviation temperatures e1 to ex for each showcase 3.
System deviation E = e1 + e2 + ... + ex
System deviation integrated value E ′ = system deviation integrated value e ′ of the previous cycle + system deviation E
= E'1 + e'2 + e'3 + ... + e'x
Then, the control unit 31 determines whether or not the system deviation integrated value e ′ exceeds a preset system management value β, and a phenomenon in which the system deviation integrated value E ′ exceeds the system management value β is detected. In this case, the system is determined to be abnormal in the entire system in the same refrigerant pipe 19.

That is, as shown in FIG. 5, if the system deviation integrated value E ′ is within the range (± β) of the system management value β, the control unit 31 has a normal cooling state of the entire system in the same refrigerant pipe 19. It is judged that there is.
For example, in the case shown in FIG. 5, when the system deviation integrated value E ′ exceeds the upper limit (+ β) of the system management value, the control unit 31 tends to be cold as a whole system. When E ′ is less than the lower limit (−β) of the system management value, it is determined that there is an abnormality because the entire system tends to be too cold.
When the control unit 31 determines that the entire system is abnormal, the setting condition output unit 37 sets an operation condition for eliminating the abnormal state and sends it to the showcase control unit 39. The showcase control unit 39 automatically adjusts the operation of the showcase 3 based on the set condition, and if the abnormal state does not improve even after a predetermined time has passed, the notification unit 33 notifies the abnormality. Is configured to do.

Since FIG. 7 is an example in which the determination is made using the system deviation integrated value and the individual deviation integrated value, the determination in the third period will be described later.
First, a description will be given of a case where determination is made based on the system deviation integrated value and the individual deviation integrated value in the second period.

  The individual deviation integrated value e ′ for each showcase 3 is, for example, as shown in FIG. 6, when the showcase 3 has cases 1 to 4, the control unit 31 determines the individual deviation integrated value in case 1. Since e′1 exceeds + α, it is determined that the cooling tends to be bad. In case 4, since the individual deviation integrated value e′4 is less than −α, it is determined that the cooling tends to be too cold. is there. Note that Case 2 and Case 3 are determined to be normal because the individual deviation integrated value e ′ is within the range of ± α.

Further, the control unit 31 compares the system deviation integrated value E ′ and the individual deviation integrated values e′1 to e′4 with the system management value and the individual management value, so that the entire system in the same refrigerant pipe 19 and It is possible to determine what state each showcase 3 is in.
FIG. 7 is an explanatory diagram showing an index of the state of the entire system and each showcase 3 based on the relationship between the system deviation integrated value and the system management value and the relationship between the individual deviation integrated value and the individual management value. In FIG. 7, the index described is merely an example, and varies depending on the system configuration, the control program, and the like.

Specifically, as shown in FIG. 7, when the system deviation integrated value e ′ is in the range of ± β, it is divided into cases where it is less than −β and exceeds + β, and individual deviation integrated values e′1 to e ′. When '4 is all within the range of ± α, the individual deviation integrated values e'1 to e'4 are those less than -α and those within the range of ± α (nothing exceeds + α), When the individual deviation integrated values e′1 to e′4 exceed + α and within the range of ± α (no less than −α), the individual deviation integrated values e′1 to e′4 are −α. By dividing into cases where less than and more than + α are mixed, it is possible to determine to some extent the state of the entire system and cases 1 to 4 with these combinations.
For example, when the system deviation integrated value E ′ is in the range of ± β and the individual deviation integrated values e′1 to e′4 are all in the range of ± α, it can be determined that the entire system is normal. it can.
Further, when the system deviation integrated value E ′ is less than −β and the individual deviation integrated values e′1 to e′4 are all within the range of ± α, it is determined that the entire system tends to be too cold. Can do.
When the system deviation integrated value E ′ exceeds + β and the individual deviation integrated values e′1 to e′4 are all within the range of ± α, it can be determined that the entire system tends to be cold.

Similarly, when the system deviation integrated value E ′ is in the range of ± β and the individual deviation integrated values e′1 to e′4 are less than −α and within the range of ± α, the individual deviation It can be determined that the case where the integrated value is less than -α is cold.
When the system deviation integrated value E ′ is less than −β and the individual deviation integrated values e′1 to e′4 are less than −α and within the range of ± α, the individual deviation integrated value is −α. It can be judged that the case below is too cold.
When the system deviation integrated value E ′ exceeds + β and the individual deviation integrated values e′1 to e′4 are less than −α and within the range of ± α, the individual deviation integrated value is ± α. It can be determined that some cases within the range tend to be cold.

When the system deviation integrated value E ′ is in the range of ± β and the individual deviation integrated values e′1 to e′4 exceed + α and within the range of ± α, the individual deviation integrated value is + α. It can be judged that the case that exceeds is cold.
When the system deviation integrated value E ′ is less than −β and the individual deviation integrated values e′1 to e′4 exceed + α and within the range of ± α, the individual deviation integrated value exceeds + α. It can be determined that the case is cold. In this case, there is a high possibility that the case exceeding + α has some influence and the other cases are too cold.
When the system deviation integrated value E ′ exceeds + β and the individual deviation integrated values e′1 to e′4 exceed + α and within the range of ± α, the entire system tends to be cold. It can be judged.

When system deviation integrated value E ′ is in the range of ± β and individual deviation integrated values e′1 to e′4 are less than −α or more than + α, the individual deviation integrated value is set to + α. Cases exceeding the above tend to be cold, and cases where the individual deviation integrated value is less than -α are cold, and it can be determined that the entire system is in a poor balance.
When the system deviation integrated value E ′ is less than −β and the individual deviation integrated values e′1 to e′4 are less than −α or more than + α, the individual deviation integrated value exceeds + α. It can be determined that it is likely that it is cold and that this case has some effect and is causing the entire system to be too cold.
If the system deviation integrated value E ′ exceeds + β and the individual deviation integrated values e′1 to e′4 are less than −α or more than + α, the overall system tends to be cold. Judgment can be made.

Further, in the third period, as shown in the following equation, the control unit 31 calculates the individual deviation integrated values e ″ 1 to e ″ for each showcase 3 from the deviation temperature e recorded for each first period. Find x.
e ″ 1 = deviation temperature integrated value e ″ 1 + deviation temperature e1 in the previous cycle
e ″ 2 = deviation temperature integrated value e ″ 2 + precise temperature e2 of the previous cycle
Here, the third period is a period that is longer than the first period and equal to or less than the second period, is appropriately set, and may be the same as the second period.
Then, the control unit 31 compares the individual deviation integrated value e ″ n in the third period with the individual management value α ′ set for each showcase 3, and detects a phenomenon exceeding the individual management value α ′. In the case where it is performed or when a phenomenon that exceeds a predetermined number of times continuously occurs, it is determined that automatic adjustment of the showcase 3 is necessary, and automatic adjustment control is performed.

As described above, by obtaining the system deviation integrated value E ′ and the individual deviation integrated value e′n in the second period, it becomes possible to determine the state of the entire system and each showcase 3 to some extent, which is necessary. The adjustment method can be determined.
Further, by obtaining the individual deviation integrated value e ″ in the third period, it is possible to determine a necessary adjustment method for each showcase 3.

In the present embodiment, the control unit 31 is configured to automatically adjust the operation of the showcase 3 according to the state of each showcase 3.
That is, the control unit 31 is configured to adjust, for example, the degree of superheat for the corresponding showcase 3 when it is determined that the showcase 3 is too cold, too cold, or poorly cooled. .
Specifically, when the temperature is too cold or too cold, the degree of superheat of the corresponding showcase 3 is adjusted to be large, and when the temperature is not good, the degree of superheat is adjusted to be small.

In addition, the control unit 31 of each showcase 3 shows a case where the individual deviation integrated value e ″ n is less than the individual management value −α ′ or a predetermined number of consecutively less than the individual management value −α ′. Showcase 3 in which the degree of superheat is adjusted to be larger than the case 3 and the individual deviation integrated value e ″ n exceeds the individual management value + α ′ or exceeds the individual management value + α ′ continuously for a predetermined number of times. On the other hand, it adjusts so that a superheat degree may be made small.
In addition, the showcase 3 judged to be cold or too cold, or the individual deviation integrated value e ″ n is less than the individual management value −α ′ or continuously less than the individual management value −α ′ for a predetermined number of times. For the showcase 3, the opening of the indoor motor operated valve 18 is closed to reduce the amount of refrigerant flowing to the evaporator 15 of the showcase 3.
On the other hand, showcase 3 judged to be cold, or showcase in which individual deviation integrated value e ″ n exceeds individual management value + α ′ or continuously exceeds individual management value + α ′ for a predetermined number of times. 3, the opening degree of the indoor motor operated valve 18 is opened to increase the amount of refrigerant flowing to the evaporator 15 of the showcase 3.

In this case, in this embodiment, when the operation of the showcase 3 is automatically adjusted by the control unit 31, the adjustment is performed while checking the state of the other showcase 3 connected to the same refrigerant pipe. Is preferred.
That is, when the automatic adjustment of the operation of a specific showcase 3 is performed, the amount of adjustment is determined so that the state of the other showcase 3 is not deteriorated, thereby maintaining the normal state of the entire system. It becomes possible.

As another means for adjusting the degree of superheat of the showcase 3, for example, it may be performed by adjusting the air volume of the indoor fan 16.
In this case, the degree of superheat is reduced with respect to the showcase 3 in which the individual deviation integrated value e ″ n is less than the individual management value −α ′ or is continuously less than the individual management value −α ′ for a predetermined number of times. As described above, the number of rotations of the indoor fan 16 is reduced to reduce the heat exchange amount in the evaporator 15 of the showcase 3.
On the contrary, when the individual deviation integrated value e ″ n exceeds the individual management value + α ′ or the showcase 3 in which the individual management value + α ′ is continuously exceeded for a predetermined number of times, The number of rotations of the fan 16 is increased to increase the amount of heat exchange in the evaporator 15 of the showcase 3.

  In addition, even when the degree of superheat of the showcase 3 is adjusted according to the state of each showcase 3 in this way, the state where the individual deviation of the showcase 3 exceeds the individual management value or the state below the individual management value When it is not solved, the control unit 31 notifies the failure by the notification unit 33.

Next, the operation of this embodiment will be described.
In the present embodiment, in the refrigeration / refrigeration cycle, by driving the compressor 10, the high-pressure refrigerant is sent to the outdoor heat exchanger, and the refrigerant condensed by exchanging heat with the outside air by the outdoor heat exchanger is The pressure is reduced by the indoor expansion valve 17 of the showcase 3 and then sent to the evaporator 15. This refrigerant is returned to the compressor 10 after the evaporator 15 cools the interior of the showcase 3 by exchanging heat with the interior air of the showcase 3.

Next, the operation in determining the state of each showcase 3 will be described with reference to the flowchart shown in FIG.
In the present embodiment, when the refrigeration system is operating, the interior temperature is controlled for each showcase 3 by the showcase control unit 39. When the showcase control unit 39 starts the internal temperature control for each showcase 3 based on a predetermined set temperature, first, the internal temperature sensor 24 detects the internal temperature, and the showcase control unit 39 The showcase information acquisition unit 35 acquires the internal temperature of each showcase 3 (ST1).

When the time of the first cycle has elapsed (ST2: YES), the control unit 31 performs the first cycle for each showcase 3 based on the internal temperature acquired by the showcase information acquisition unit 35. The moving average temperature TPA of the internal temperature is calculated (ST3).
The control unit 31 calculates the deviation temperature e for each showcase 3 based on the moving average temperature TPA of the internal temperature (ST4).

When the time of the second cycle has elapsed (ST5: YES), the control unit 31 calculates an individual deviation e′x obtained by integrating the deviation temperature e for each showcase 3 (ST6).
Further, the control unit 31 calculates the system deviation E and the system deviation integrated value E ′ of all the showcases 3 in the same refrigerant pipe 19 (ST7).
And the control part 31 memorize | stores the log | history of deviation temperature in the log | history memory | storage part 36 (ST8).

The control unit 31 determines whether or not the individual deviation integrated value e ″ n is in the range of the individual management value ± α (ST9), and the individual deviation integrated value e ″ n exceeds the individual management value + α. Alternatively, if it is less than the individual management value -α (ST9: YES), it is determined that there is an abnormality (ST10). Then, the setting condition output unit 37 sets an operating condition for eliminating the abnormal state and sends it to the showcase control unit 39. The showcase control unit 39 automatically operates the showcase 3 based on the set condition. Adjustment is performed (ST11).
Then, after automatically adjusting the operation of the showcase 3, it is determined whether or not the individual deviation integrated value e ″ n is within the range of the individual management value ± α (ST12), and the individual deviation integrated value e ″ is determined. When n exceeds the individual management value + α or less than the individual management value −α (ST12: YES), the control unit 31 determines that the showcase 3 is out of order and causes the notification unit 33 to notify it. (ST13).

As described above, according to the present embodiment, the control unit 31 causes each showcase 3 acquired in the first period in the range of the third period longer than the first period and equal to or less than the second period. The individual deviation is integrated by calculating the individual deviation integrated value, and when the individual deviation integrated value exceeds the preset individual management value, it is determined that the showcase 3 is abnormal, and the control unit 31 Since the automatic adjustment is performed to eliminate the abnormality, the operation of the showcase 3 can be properly restored to normal when there is an abnormality in the showcase 3.
In addition, since the second cycle is set within a period from the end of the pull-down operation after the defrost operation to the start of the next defrost operation, the second cycle is stable in a period excluding the defrost operation and the pull-down operation. A system deviation integrated value can be obtained.

  Further, a system deviation integrated value is obtained by integrating the deviations acquired in the first cycle by the control unit 31 within a range of the second cycle longer than the first cycle, and the system deviation integrated value is set in advance. When the management value is exceeded, it is determined that the system is abnormal, and the control unit 31 automatically adjusts so as to eliminate the system abnormality, so that the operation of the entire system can be returned to normal.

Since the automatic adjustment by the control unit 31 is performed by adjusting the degree of superheat, the cooling state of the showcase 3 can be adjusted by adjusting the degree of superheat.
In addition, the automatic adjustment by the control unit 31 is performed by adjusting the opening of the indoor motor-operated valve 18 that adjusts the amount of refrigerant sent to the evaporator 15. Thus, the cooling state of the showcase 3 can be adjusted.
Further, since the automatic adjustment by the control unit 31 is performed by adjusting the rotation amount of the indoor fan 16 that blows air to the evaporator 15, the showcase 3 is cooled by adjusting the rotation amount of the indoor fan 16. The state can be adjusted.

  Furthermore, even when the control unit 31 automatically adjusts, when the abnormality of the showcase 3 is not resolved, the notification unit that notifies the fact is provided, so that the failure of the showcase 3 can be notified to the outside.

In the refrigeration system of the present embodiment, the control unit 31 of the integrated controller 30 starts from the set temperature TP and the set temperature TS of the showcase 3 acquired by the showcase information acquisition unit 35 by the internal temperature sensor 24 at a predetermined cycle. The moving average temperature TP and the deviation temperature e, which is the difference between the moving average temperature TP and the set temperature TS, are calculated every one cycle. The moving average temperature TP and the deviation temperature e are calculated for each showcase 3. You may make it perform by the showcase control part 39. FIG.
In the embodiment, the system deviation integrated value E ′ and the individual deviation integrated value e ″ are respectively obtained and the showcase 3 is automatically adjusted. For example, the individual deviation integrated value e ″ Alternatively, the showcase 3 may be automatically adjusted based on the individual deviation integrated value e ″.
The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Refrigerator 2 Indoor unit 3 Showcase 10 Compressor 11 Condenser 12 Outdoor fan 15 Evaporator 16 Indoor fan 17 Indoor expansion valve 18 Indoor motor operated valve 19 Refrigerant piping 20 Low pressure sensor 21 High pressure sensor 22 Discharge temperature sensor 23 Outside temperature sensor 24 Internal temperature sensor 25 Inlet temperature sensor 26 Outlet temperature sensor 30 Integrated controller 31 Control unit 32 Storage unit 33 Notification unit 34 Refrigerator information acquisition unit 35 Showcase information acquisition unit 37 Setting condition output unit 38 Refrigerator control unit 39 Showcase control unit

Claims (7)

A refrigerant circuit is constituted by a compressor, a condenser, an expansion valve, and an evaporator, and includes a plurality of cooled spaces that are cooled by the evaporator,
Control that controls the capacity of the compressor based on the low-pressure side pressure and the set pressure of the compressor, and changes the set pressure based on the deviation between the temperature of the cooled space and the set temperature in the first period. In the refrigeration system with a section,
The control unit obtains a system deviation integrated value by integrating the deviations acquired in the first cycle in a range of a second cycle longer than the first cycle, and the system deviation integrated value is preset. When the system management value is exceeded, if the system deviation integrated value exceeds a preset system management value, it is determined that the system is abnormal, and the control unit automatically adjusts so as to eliminate the system abnormality. A refrigeration system characterized by that.   2. The refrigeration system according to claim 1, wherein the second cycle is set within a period from when the pull-down operation after the defrost operation is completed to when the next defrost operation is started.   The control unit integrates the individual deviation for each space to be cooled acquired in the first cycle within a range of a third cycle that is longer than the first cycle and less than or equal to the second cycle. When the individual deviation integrated value exceeds a preset individual management value, it is determined that the cooling space is abnormal, and the control unit automatically adjusts so as to eliminate the cooling space abnormality. The refrigeration system according to claim 1 or 2, characterized in that:   The refrigeration system according to any one of claims 1 to 3, wherein the automatic adjustment by the control unit is performed by adjusting a degree of superheat.   The refrigeration according to any one of claims 1 to 3, wherein the automatic adjustment by the control unit is performed by adjusting an opening of an electric valve that adjusts an amount of refrigerant to be sent to the evaporator. system.   The refrigeration system according to any one of claims 1 to 3, wherein the automatic adjustment by the control unit is performed by adjusting an amount of rotation of an indoor fan that blows air to the evaporator.   Even when the controller determines that the space to be cooled is abnormal and automatically adjusts so as to eliminate the abnormality in the space to be cooled, if the abnormality in the space to be cooled does not disappear, a notification to that effect The refrigeration system according to any one of claims 1 to 6, further comprising a section.

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