JP6311286B2 - Refrigeration system - Google Patents

Description

  The present invention relates to a refrigeration system, and more particularly to a refrigeration system including a plurality of refrigerated indoor air conditioners.

  Conventionally, a refrigeration system including a plurality of refrigerated indoor air conditioners is known (see, for example, Patent Document 1). In Patent Document 1, a refrigerator, a plurality of showcases (refrigerated indoor air conditioners) to which refrigerant is supplied from the refrigerator, and the refrigerator and the plurality of showcases are provided and flow into the showcase. A refrigeration system including a plurality of solenoid valves for controlling the flow of refrigerant is disclosed. And it is comprised so that the temperature in a showcase may be hold | maintained at desired temperature by turning on and off a solenoid valve.

  Here, in the conventional refrigeration system composed of a refrigerator and a plurality of showcases as described in Patent Document 1, all or all refrigerants flowing through a number of showcases are stopped simultaneously (all Or when many solenoid valves are simultaneously turned off), the compressor of the refrigerator may stop temporarily. For this reason, there is an inconvenience that power consumption is increased due to repeated operation and stop of the compressor. Therefore, in Patent Document 1, the refrigerant flowing through the plurality of showcases is sequentially stopped while shifting the timing, the timing at which the compressor stops is predicted, and at least one electromagnetic valve is turned on in accordance with the timing. Thus, the compressor is configured not to stop. As a result, the number of driven showcases is leveled, and the repetition of operation and stop of the compressor is suppressed, so that it is possible to save power accordingly.

Japanese Patent No. 4850103

  However, in the refrigeration system described in Patent Document 1, at least one solenoid valve is turned on (at least one refrigerated indoor air conditioner is always driven), so the operating rate of the refrigerated indoor air conditioner is As a result, it is difficult to realize a low state, and as a result, it is difficult to achieve power saving while realizing a state with a low operating rate.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to provide a refrigeration system that can achieve power saving while realizing a low operating rate. Is to provide.

A refrigeration system according to one aspect of the present invention includes a refrigerator, a plurality of refrigerated indoor air conditioners connected to the refrigerator, and a control unit that controls on / off of the plurality of refrigerated indoor air conditioners, A plurality of refrigerated indoor air conditioners are controlled based on the operation rate of the plurality of refrigerated indoor air conditioners while shifting the timings of the on controls of the plurality of refrigerated indoor air conditioners from each other and shifting the timings of the off controls from each other. The first control in which all the machines are turned off and the second control in which at least one of the plurality of refrigerated indoor air conditioners is controlled to be turned on are selectively performed. ing.

In the refrigeration system according to one aspect of the present invention, as described above, the control unit controls the timings of the on-controls of the plurality of refrigerated indoor air conditioners to be shifted from each other and the timings of the off-controls are shifted from each other. However , based on the operation rate of the plurality of refrigerated indoor air conditioners, the first control for turning off all of the plurality of refrigerated indoor air conditioners and at least one of the plurality of refrigerated indoor air conditioners turned on. By selectively configuring the second control to be controlled so as to be in a state, the on-control of a plurality of refrigerated room air conditioners is performed, including a state in which the number of driven refrigerated room air conditioners is zero. Are controlled so that the timings of the off-controls are shifted from each other and the timings of the off-controls are shifted from each other.

  In the refrigeration system according to the above aspect, preferably, the refrigeration system further includes a plurality of control valves that are provided for each of the plurality of refrigeration room air conditioners and that control the flow of refrigerant flowing into the refrigeration room air conditioner, and the control unit includes a plurality of control valves. By turning the control valves on and off while shifting the timings, the timings of the on-controls of the plurality of refrigerated indoor air conditioners are shifted from each other, and the timings of the off-controls are shifted from each other. If comprised in this way, the timing of ON control of several refrigeration room air conditioners will mutually be shifted mutually, and the timing of OFF control will mutually be shifted easily by turning on and off a control valve, shifting timing mutually. Can do.

  In the refrigeration system according to the one aspect described above, preferably, the refrigeration system further includes a plurality of temperature detection units provided for each of the plurality of refrigeration room air conditioners, and the control unit detects a temperature outside the target temperature range by the temperature detection unit. If the temperature outside the target temperature range is detected, a plurality of temperature detection units detect the temperature outside the target temperature range. The refrigeration room air conditioners are controlled so that the timings of the on-controls are shifted from each other and the timings of the off-controls are shifted from each other. If comprised in this way, even when the temperature outside a target temperature range is detected by a plurality of temperature detection parts, it is suppressed that a plurality of refrigerating room air conditioners are turned on or off at the same time. Can be achieved.

In this case, preferably, the control unit, by turning on and off of the refrigeration compartment air conditioner corresponding to the temperature detection unit temperature is detected outside the goal temperature range, driving the number of cold room air conditioner is predetermined If the number of driven units is out of the range, at least one of the refrigerating room air conditioners other than the refrigerating room air conditioner that was turned on or off immediately before is turned on or off to drive the refrigerating room air conditioner. Control is made so that the number is within the range of the number of drive units determined in advance. With this configuration, the driving of the refrigerated indoor air conditioner beyond the range of the predetermined number of driven units is suppressed, so that the number of driven refrigerated indoor air conditioners is leveled, resulting in power saving. Can be achieved.

  In the refrigeration system in which the refrigerated indoor air conditioner is turned on or off when the number of driven refrigerated indoor air conditioners deviates from the range of the predetermined number of driven units, preferably the control unit includes the refrigerated indoor air conditioner. If the number of drive units exceeds the range of drive units determined in advance, the target temperature of the refrigeration room air conditioners other than the refrigeration room air conditioner that was turned on immediately before and that is in the on state of the refrigeration room air conditioner. Turn off the refrigerated indoor air conditioner corresponding to the temperature measurement unit that detected the temperature with the largest absolute value of the difference from the lower limit of the range, and the number of refrigerated indoor air conditioners to be driven will be within the range of the predetermined number of driven units. If the temperature is lower than that of the refrigerated indoor air conditioner that was turned off immediately before, and the refrigerated indoor air conditioner in the off state, the temperature having the largest absolute value of the difference from the upper limit of the target temperature range Detect It is configured to the refrigeration compartment air conditioner corresponding to the temperature measuring unit in the ON state. If comprised in this way, the area | region of a comparatively low temperature (relatively high temperature) state will be made by turning off the refrigeration room air conditioner arrange | positioned in the comparatively low temperature (relatively high temperature) area | region. Furthermore, since it can suppress that it becomes low temperature (high temperature), it can suppress that the temperature in the area | region (for example, warehouse) where a refrigeration system is arrange | positioned locally becomes low (it becomes high).

In the refrigeration system in which the refrigerated indoor air conditioner is turned on or off when the number of driven refrigerated indoor air conditioners deviates from the range of the predetermined number of driven units, preferably the control unit includes the refrigerated indoor air conditioner. If the number of drive units exceeds the range of drive units determined in advance, the operating rate of the refrigerated indoor air conditioners other than the refrigerated indoor air conditioner that was turned on immediately before, If the lowest refrigerated room air conditioner is turned off and the number of refrigerated room air conditioners driven falls below the predetermined number of drive units, the refrigerated room air conditioners other than the chilled room air conditioner that was turned off immediately before And among the refrigerated indoor air conditioners in the off state, the refrigerated indoor air conditioner having the highest operating rate is turned on. Here, in general, the refrigerated indoor air conditioner disposed in a region where the temperature tends to be relatively high (relatively low) has a high (low) operation rate. Therefore, if the number of refrigerated indoor air conditioners exceeds the predetermined number of driven units (if it falls below), the refrigerated indoor air conditioners other than the refrigerated indoor air conditioners that have just been turned on (off state) In addition, among the refrigerated indoor air conditioners that are in the on state (off state), the refrigerated indoor air conditioner having the lowest operation rate (the highest) is turned off ( on state), so that the temperature is relatively low (relatively high temperature). It can suppress that the area | region of this state becomes further low temperature (high temperature). Thereby, it can suppress that the temperature in the area | region (for example, warehouse) where a refrigeration system is arrange | positioned becomes low locally (it becomes high).

  According to the present invention, as described above, it is possible to save power while realizing a state where the operation rate is low.

It is a block diagram of the refrigeration system by 1st and 2nd embodiment of this invention. It is the figure which showed the relationship between the operation rate of the unit cooler of the refrigeration system by 1st and 2nd embodiment of this invention, and the number of drives. It is the flowchart which showed the control processing of the refrigeration system by 1st Embodiment of this invention. It is the flowchart which showed the control processing of the refrigeration system by 2nd Embodiment of this invention.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments embodying the present invention will be described below with reference to the drawings.

(First embodiment)
First, with reference to FIG. 1 and FIG. 2, the structure of the refrigeration system 100 by 1st Embodiment of this invention is demonstrated.

  As shown in FIG. 1, the refrigeration system 100 according to the first embodiment includes a refrigerator 1, a unit cooler 2, a solenoid valve 3, a temperature sensor 4, and a control unit 5. The unit cooler 2 and the temperature sensor 4 are disposed in the warehouse 6. The unit cooler 2 is an example of the “refrigerated indoor air conditioner” in the present invention. The electromagnetic valve 3 is an example of the “control valve” in the present invention. The temperature sensor 4 is an example of the “temperature detection unit” in the present invention.

  The refrigerator 1 includes a condenser 11 and a compressor 12. Moreover, the compressor 12 has a role which compresses the gas refrigerant suck | inhaled from the low voltage | pressure side in the refrigerating cycle mentioned later, and discharges it to a high voltage | pressure side. The compressor 12 is an inverter-controlled compressor capable of controlling the refrigerant discharge amount by changing the rotation speed (operation frequency).

The condenser 11 has a function of cooling a superheated gas state refrigerant (for example, carbon dioxide (CO ₂ )) flowing through the inside using external air. Further, the refrigerant condensed (liquefied) in the condenser 11 flows into the unit cooler 2 through the electromagnetic valve 3.

  A plurality of unit coolers 2 (six in the first embodiment) are provided in the warehouse 6. Each of the six unit coolers 2 (unit coolers 2a, 2b, 2c, 2d, 2e, and 2f) includes an expansion valve 21 and an evaporator 22, respectively.

  The expansion valve 21 has a role of expanding and contracting (reducing pressure) the refrigerant cooled (liquefied) by the condenser 11 and supplying the refrigerant to the evaporator 22. The expansion valve 21 is configured to open and close the valve mechanism using the driving force of a stepping motor driven by pulse control. Further, the liquid refrigerant expanded and contracted by the expansion valve 21 flows into the evaporator 22 in a gas-liquid two-phase state composed of a gas phase and a liquid phase.

  The evaporator 22 is provided with a blower (not shown), and air (cool air) for cooling the inside of the warehouse 6 is circulated through the warehouse 6 by the blower. Further, when the circulating refrigerant evaporates (vaporizes), the evaporator 22 takes heat from the circulating air and cools the circulating air. Further, the refrigerant after evaporation in the evaporator 22 is returned to the compressor 12 of the refrigerator 1 in a gas state containing a large amount of gas phase.

  Thus, in the refrigeration system 100, a refrigeration cycle is configured in which the refrigerant discharged from the compressor 12 flows in the order of the condenser 11, the expansion valve 21, and the evaporator 22 and is returned to the compressor 12.

  The electromagnetic valve 3 is provided between the refrigerator 1 and the unit cooler 2. Here, in the first embodiment, a total of six solenoid valves 3 are provided for each unit cooler 2 (unit coolers 2a to 2f). The electromagnetic valve 3 has a function of controlling the flow of refrigerant flowing into the unit cooler 2. That is, when the electromagnetic valve 3 is turned on, the refrigerant flows into the unit cooler 2 (expansion valve 21, evaporator 22), and the unit cooler 2 is turned on (driving state). Further, when the solenoid valve 3 is turned off, the refrigerant does not flow to the unit cooler 2 (expansion valve 21, evaporator 22), and the unit cooler 2 is turned off (non-driven state).

  In the first embodiment, the temperature sensors 4 (temperature sensors 4a, 4b, 4c, 4d, 4e, and 4f) are arranged in the vicinity of the unit cooler 2 and correspond to each of the six unit coolers 2 ( 6 units in total).

  The controller 5 is configured to receive temperature data detected from the temperature sensor 4 and to control the on / off of the electromagnetic valve 3. Here, in the first embodiment, the controller 5 controls the six unit coolers 2 while shifting the timings of the on-controls of the six unit coolers 2 to each other and shifting the timings of the off-controls of the six unit coolers 2 to each other. All the coolers 2 are turned off, or at least one of the six unit coolers 2 is controlled to be turned on. Specifically, the control unit 5 shifts the timings of the on-controls of the six unit coolers 2 from each other by turning the six solenoid valves 3 on and off while shifting the timings, and the timings of the off-controls. Are controlled so as to be shifted from each other. That is, the control unit 5 is configured to control so that two or more unit coolers 2 (solenoid valves 3) are not turned on (off) at the same time.

  Further, when the temperature sensor 4 detects a temperature outside the target temperature range (T1) by the temperature sensor 4, the control unit 5 corresponds to the temperature sensor 4 in which the temperature outside the target temperature range (T1) is detected (arranged nearby). The unit cooler 2 (solenoid valve 3) is turned on and off. For example, when a temperature outside the target temperature range (T1) is detected by the temperature sensor 4a, the unit cooler 2a (solenoid valve 3a) disposed in the vicinity of the temperature sensor 4a is turned on / off. Here, the target temperature range (T1) is, for example, a range of ± 2 degrees (T0-2 ≦ T1 ≦ T0 + 2) with respect to the set temperature (T0). Specifically, when the temperature sensor 4 detects a temperature T (> T0 + 2) higher than the target temperature range (T1) by the temperature sensor 4, the controller 5 turns on the unit cooler 2 (solenoid valve 3). The vicinity of the unit cooler 2 is cooled. When the temperature sensor 4 detects a temperature T (<T0-2) lower than the target temperature range (T1) by the temperature sensor 4, the controller 5 turns off the unit cooler 2 (solenoid valve 3), The cooling in the vicinity of the unit cooler 2 is stopped.

  Further, when temperatures outside the target temperature range (T1) are detected by the plurality of temperature sensors 4, the timings of the on-controls of the plurality of unit coolers 2 are shifted from each other, and the timings of the off-controls are shifted from each other. It is configured to control. For example, when the temperature sensors 4a and 4b detect a temperature T (lower temperature T) higher than the target temperature range (T1), the unit coolers 2a and 2b (solenoid valves 3a and 3b) are simultaneously turned on (off). Instead, it is configured to be turned on (off) while shifting the timing from each other. Specifically, after the unit cooler 2a (solenoid valve 3a) is turned on (off), the unit cooler 2b (solenoid valve 3b) is turned on (off) after a predetermined time has elapsed (for example, several seconds later). Is done.

  Moreover, the control part 5 is comprised so that the range of the drive unit number of the unit cooler 2 may be previously determined with respect to the whole operation rate (average operation rate) of the six unit coolers 2. FIG. For example, as shown in FIG. 2, when the overall operation rate (average operation rate) of six unit coolers 2 is 0% or more and less than 34% (pattern 1), the number of unit coolers 2 driven is It is determined from 0 (minimum drive number) to 2 (maximum drive number). When the overall operation rate (average operation rate) of the six unit coolers 2 is 34% or more and less than 67% (pattern 2), the number of unit coolers 2 driven is two (minimum number of drives). ~ 4 units (maximum number of drives) are determined. Further, when the total operation rate (average operation rate) of the six unit coolers 2 is 67% or more and 100% or less (pattern 3), the number of unit coolers 2 driven is four (minimum number of drives). ~ 6 units (maximum drive number) are determined.

  And the control part 5 turns on / off the unit cooler 2 corresponding to the temperature sensor 4 from which the temperature outside the target temperature range (T1) is detected (arranged), so that the number of unit coolers 2 driven is increased. When the predetermined number of drive units is out of range, at least one of the unit coolers 2 other than the unit cooler 2 that has been turned on or off immediately before is turned on or off, and the unit cooler 2 Control is made so that the number of drives falls within a predetermined number of drives. For example, when the number of drive units of the unit cooler 2 is determined between 2 and 4, the unit cooler 2a is turned on (drive state) and the number of drive units becomes 5 units. In this case, one of the unit coolers 2b to 2f other than the unit cooler 2a that was turned on immediately before is turned off, and the number of driven units is set to four.

  In addition, when the number of drive units of the unit cooler 2 exceeds the range of drive units determined in advance, the control unit 5 is a unit cooler 2 other than the unit cooler 2 that was turned on immediately before and the unit cooler 2 is turned on. Among the coolers 2, the unit cooler 2 corresponding to the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the lower limit value (T0-2) of the target temperature range is configured to be turned off. For example, when the unit cooler 2a is turned on (driving state) and the number of drive units becomes five, the unit coolers 2b to 2f other than the unit cooler 2a that has been turned on immediately before are turned on. In the unit cooler 2 in the state (driving state), the unit cooler 2 disposed in the vicinity of the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the lower limit value (T0-2) of the target temperature range is off. In this state, the number of drives is set to four.

  In addition, when the number of drive units of the unit cooler 2 falls below the range of drive units determined in advance, the control unit 5 is a unit cooler 2 other than the unit cooler 2 that has been turned off immediately before and the unit in the off state. Among the coolers 2, the unit cooler 2 corresponding to the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the upper limit value (T0 + 2) of the target temperature range is turned on. For example, when the unit cooler 2a is turned off (non-driven state) so that the number of driven units becomes 1, the unit coolers 2b to 2f other than the unit cooler 2a that has been turned off immediately before, and Among the unit coolers 2 in the off state (non-drive state), the unit cooler 2 disposed in the vicinity of the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the upper limit value (T0 + 2) of the target temperature range is on. As a result, the number of drives is set to two.

  Next, with reference to FIG. 3, operation | movement of the control part 5 of the refrigeration system 100 by 1st Embodiment is demonstrated.

  First, as shown in FIG. 3, in step S <b> 1, the range of the number of unit coolers 2 to be driven is determined with respect to the overall operation rate (average operation rate) of the six unit coolers 2. Here, the overall operation rate (average operation rate) of the six unit coolers 2 is 34% or more and less than 67% (pattern 2), and the number of driven unit coolers 2 is determined to be 2 to 4 units. (See FIG. 2).

  Next, in step S2, the temperature values of all the temperature sensors 4 (4a to 4f) are acquired. In step S3, it is determined whether or not the temperature sensor 4 (4a to 4f) has detected a temperature outside the target temperature range (T1). In step S3, if the temperatures T detected by all the temperature sensors 4 are within the target temperature range (T1), the process returns to step S2.

  On the other hand, in step S3, if the temperature T detected by at least one temperature sensor 4 among all the temperature sensors 4 (4a to 4f) is outside the target temperature range (T1), the process proceeds to step S4. Here, if one temperature sensor 4 has detected a temperature outside the target temperature range (T1), the unit cooler 2 disposed in the vicinity of the temperature sensor 4 is turned on and off. For example, when the temperature sensor 4a detects a temperature T (<T0-2) lower than the target temperature range (T1), the unit cooler 2a (electromagnetic valve 3a) is turned off. When the temperature sensor 4a detects a temperature T (> T0 + 2) higher than the target temperature range (T1), the unit cooler 2a (electromagnetic valve 3a) is turned on.

  If there are a plurality of temperature sensors 4 that detect temperatures outside the target temperature range (T1) in step S3, the unit cooler 2 (solenoid valve 3) corresponding to these temperature sensors 4 is turned on / off in step S4. The on / off timing is shifted so as not to overlap each other. For example, when the temperature sensors 4a and 4b detect a temperature T (<T0-2) lower than the target temperature range (T1), the unit cooler 2a (solenoid valve 3a) is turned off, After the elapse of time, the unit cooler 2b (solenoid valve 3b) is turned off. Further, when the temperature sensors 4a and 4b detect a temperature T (> T0 + 2) higher than the target temperature range (T1), a predetermined time elapses after the unit cooler 2a (solenoid valve 3a) is turned on. Thereafter, the unit cooler 2b (electromagnetic valve 3b) is turned on.

  Next, in step S5, it is determined whether or not the number of drive units of the unit cooler 2 is out of the predetermined drive number range (here, 2 to 4 units). In step S5, if the number of driven unit coolers 2 is within the predetermined number of driven units, the process proceeds to step S6 to turn on / off other unit coolers 2 (other than the unit cooler 2 turned off immediately before). Is not performed, and then the process returns to step S2.

  On the other hand, if the number of unit coolers 2 to be driven is outside the range of the predetermined number of drive units, the process proceeds to step S7. Here, when the number of drive units of the unit cooler 2 exceeds the range of drive units determined in advance, the unit cooler 2 other than the unit cooler 2 turned on immediately before and the unit cooler 2 in the on state Then, the unit cooler 2 corresponding to the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the lower limit value (T0-2) of the target temperature range is turned off. On the other hand, when the number of drive units of the unit cooler 2 falls below the range of drive units determined in advance, the unit cooler 2 other than the unit cooler 2 that was turned off immediately before and the unit cooler 2 in the off state, The unit cooler 2 corresponding to the temperature sensor 4 that detects the temperature at which the absolute value of the difference from the upper limit value (T0 + 2) of the unit cooler 2 is the largest is turned on. As a result, the number of drive units is set within the range of drive units determined in advance. Then, it returns to step S2.

  Note that the processing in steps S2 to S7 is always performed (or at regular time intervals) during operation of the refrigeration system 100.

  Further, in the first embodiment, in the pattern 1, since the number of unit coolers 2 to be driven is allowed in the range of 0 to 2 units, all the unit coolers 2 are turned off in step S7. The unit coolers 2a to 2f are allowed to be turned off.

  In the first embodiment, the following effects can be obtained.

  In the first embodiment, as described above, the control unit 5 controls the plurality of unit coolers 2 so that the timings of the on-controls of the plurality of unit coolers 2 are shifted from each other and the timings of the off-controls are shifted from each other. By configuring so that all the coolers 2 are turned off or at least one of the plurality of unit coolers 2 is turned on, the number of unit coolers 2 driven is reduced to 0. Control is performed so that the timings of the on-controls of the plurality of unit coolers 2 are shifted from each other and the timings of the off-controls are shifted from each other. However, power saving can be achieved.

  In the first embodiment, as described above, a plurality of electromagnetic valves 3 provided for each of the plurality of unit coolers 2 and controlling the flow of refrigerant flowing into the unit cooler 2 are provided, and a plurality of control units 5 are provided. The electromagnetic valves 3 are turned on and off while shifting the timings, whereby the timings of the on-controls of the plurality of unit coolers 2 are shifted from each other and the timings of the off-controls are shifted from each other. Thereby, by turning on / off the electromagnetic valves 3 while shifting the timings from each other, the timings of the ON controls of the plurality of unit coolers 2 can be easily shifted from each other, and the timings of the OFF controls can be shifted from each other.

  In the first embodiment, as described above, a plurality of temperature sensors 4 provided for each of the plurality of unit coolers 2 are provided, and the temperature outside the target temperature range T1 is detected by the control unit 5 by the temperature sensor 4. When the temperature of the unit cooler 2 corresponding to the temperature sensor 4 in which the temperature outside the target temperature range T1 is detected is turned on and off, and the temperature outside the target temperature range T1 is detected by the plurality of temperature sensors 4. Is configured to shift the timings of the on-controls of the plurality of unit coolers 2 from each other and to shift the timings of the off-controls from each other. Thereby, even when the temperature outside the target temperature range T1 is detected by the plurality of temperature sensors 4, the plurality of unit coolers 2 are suppressed from being turned on and off at the same time, so that power saving can be achieved.

  Moreover, in 1st Embodiment, as mentioned above, the control part 5 is comprised so that the range of the drive unit number of the unit cooler 2 may be predetermined with respect to the operation rate of several unit cooler 2, and the control part 5 is comprised. When the unit cooler 2 corresponding to the temperature sensor 4 in which the temperature outside the target temperature range T1 is detected is turned on and off, the number of unit coolers 2 is out of the predetermined drive number range, At least one of the unit coolers 2 other than the unit cooler 2 that has just been turned on or off is brought into an on state or an off state, and the number of drive units of the unit cooler 2 falls within a predetermined drive number range. It is configured to control as follows. Thereby, since it is suppressed that the unit cooler 2 drives exceeding the range of the drive number determined beforehand, the drive number of the unit cooler 2 is leveled, As a result, power saving can be achieved.

  Further, in the first embodiment, as described above, when the number of drive units of the unit cooler 2 exceeds the range of drive units determined in advance, the control unit 5 other than the unit cooler 2 that has been turned on immediately before. The unit cooler 2 and the unit cooler 2 corresponding to the temperature sensor 4 that detects the temperature having the largest absolute value of the difference from the lower limit value of the target temperature range among the unit coolers 2 in the on state are turned off. When the number of driven coolers 2 falls below the range of drive numbers determined in advance, the unit cooler 2 other than the unit cooler 2 that was turned off immediately before, and the target temperature range of the unit coolers 2 that are turned off The unit cooler 2 corresponding to the temperature sensor 4 that has detected the temperature having the largest absolute value of the difference from the upper limit value is set to the on state. As a result, the unit cooler 2 disposed in the relatively low temperature (relatively high temperature) region is turned off (on state), so that the relatively low temperature (relatively high temperature) region is further cooled (high temperature). Therefore, the temperature in the region (warehouse 6) where the refrigeration system 100 is arranged can be prevented from becoming locally low (high).

(Second Embodiment)
Next, the refrigeration system according to the second embodiment will be described with reference to FIG. The second embodiment differs from the first embodiment in which the unit cooler is turned on and off based on the temperature detected by the temperature sensor when the number of driven unit coolers is outside the range of the predetermined number of driven units. The unit cooler is turned on and off based on the operation rate of the cooler.

  Since the structure of the refrigeration system 101 (refer FIG. 1) by 2nd Embodiment is the same as that of the said 1st Embodiment, description is abbreviate | omitted.

  Next, with reference to FIG. 4, operation | movement of the control part 5a (refer FIG. 1) of the refrigeration system 101 by 2nd Embodiment is demonstrated.

  Since the operations in steps S1 to S6 are the same as those in the first embodiment, description thereof will be omitted.

  In step S5, it is determined whether or not the number of unit coolers 2 driven is out of the predetermined number of drive units (here, assumed to be 2 to 4 units). In step S5, if the number of unit coolers 2 to be driven is within the range of the number of drive units determined in advance, the process proceeds to step S6. On the other hand, if the number of drive units of the unit cooler 2 is outside the range of drive numbers determined in advance, the process proceeds to step S8.

  Here, in 2nd Embodiment, when the drive number of the unit cooler 2 exceeds the range of the drive number determined beforehand, the control part 5a is unit cooler 2 other than the unit cooler 2 turned on immediately before. And among the unit cooler 2 of an ON state, the unit cooler 2 with the lowest operation rate is made into an OFF state. On the other hand, when the number of drive units of the unit cooler 2 falls below the range of drive units determined in advance, the control unit 5a is a unit cooler other than the unit cooler 2 that has been turned off immediately before, and is in the off state. Among the coolers 2, the unit cooler 2 with the highest operating rate is turned on.

  For example, when the temperature sensor 4a detects a temperature T (> T0 + 2) higher than the target temperature range (T1) and the unit cooler 2a (solenoid valve 3a) is turned on, the number of unit coolers 2 to be driven is determined. Suppose that it is out of the range of the number of drive units determined in advance (five). At this time, the unit coolers 2b to 2f other than the unit cooler 2a that was turned on immediately before and the unit cooler with the lowest operating rate among the unit coolers that are turned on are turned off, Is set to four (within a predetermined number of drive units). When the temperature sensor 4a detects a temperature T (<T0-2) lower than the target temperature range (T1) and the unit cooler 2a (solenoid valve 3a) is turned off, the unit cooler 2 is driven. It is assumed that the number is outside the predetermined number of drives (one). At this time, the unit cooler 2b to 2f other than the unit cooler 2a that has been turned off immediately before and the unit cooler 2 having the highest operating rate among the unit coolers 2 that are in the off state are turned on and driven. The number is set to 2 (within a predetermined number of drive units). Then, it returns to step S2.

  Other operations in the second embodiment are the same as those in the first embodiment.

In the second embodiment, as described above, when the number of drive units of the unit cooler 2 exceeds the range of drive units determined in advance, the unit coolers other than the unit cooler 2 that was turned on immediately before the control unit 5a. 2 and the unit cooler 2 having the lowest operating rate among the unit coolers 2 in the on state is turned off, and the number of unit coolers 2 falls below a predetermined number of drive units, immediately before The unit cooler other than the unit cooler 2 in the off state and the unit cooler 2 having the highest operating rate among the unit coolers 2 in the off state are configured to be in the on state. Here, in general, the unit cooler 2 disposed in a region where the temperature tends to be relatively high (relatively low) has a high (low) operation rate. Therefore, when the range of the predetermined number of drives is exceeded (when it falls below), a unit cooler 2 other than the unit cooler 2 that has just been turned on (off state) and that is in an on state (off state). By setting the unit cooler 2 having the lowest (highest) operating rate among the coolers 2 to the off state ( on state), the region of the relatively low temperature (relatively high temperature) state is further lowered (high temperature). Can be suppressed. Thereby, it can suppress that the temperature in the area | region (warehouse 6) where the refrigeration system 101 is arrange | positioned becomes low locally (it becomes high).

  The remaining effects of the second embodiment are similar to those of the aforementioned first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the example in which the refrigeration system of the present invention is arranged in a warehouse has been described, but the present invention is not limited to this. For example, the refrigeration system of the present invention may be arranged in a showcase other than a warehouse.

  Moreover, in the said 1st and 2nd embodiment, although the example which a refrigerant | coolant flows in into a unit cooler from the refrigerator was shown, this invention is not limited to this. For example, an evaporator and an expansion valve may be provided in the refrigerator in addition to the condenser and the compressor so that cold air flows from the refrigerator into the unit cooler and out into the warehouse.

  Moreover, in the said 1st and 2nd embodiment, although the example in which six unit coolers are provided in a warehouse was shown, this invention is not limited to this. For example, a plurality of unit coolers other than six may be provided in the warehouse.

  In the first and second embodiments, an example is shown in which an electromagnetic valve is provided between the refrigerator and the unit cooler to control the flow of the refrigerant flowing into the unit cooler from the refrigerator. It is not limited to this. For example, you may make it control the flow of the refrigerant | coolant which flows in into a unit cooler from a refrigerator with members other than a solenoid valve.

  Moreover, in the said 1st and 2nd embodiment, the range of the drive unit number of a unit cooler is determined in three patterns with respect to the operation rate of six unit coolers (refer FIG. 2). However, the present invention is not limited to this. For example, the range of the number of unit coolers to be driven may be determined by dividing the number into patterns other than three.

  In the first and second embodiments, the example in which the target temperature range is set to a range of ± 2 degrees with respect to the set temperature is shown, but the present invention is not limited to this. For example, the target temperature range may be a range other than ± 2 degrees with respect to the set temperature.

In the first and second embodiments, an example of a configuration using a carbon dioxide (CO ₂₎ as a refrigerant, the present invention is not limited thereto. In the present invention, a refrigerant other than carbon dioxide may be used as the refrigerant. For example, a natural refrigerant other than carbon dioxide may be used, or an alternative chlorofluorocarbon refrigerant having an ozone layer depletion coefficient of zero may be used.

  In the first and second embodiments, for convenience of explanation, the processing of the control unit has been described using a flow-driven flowchart that performs processing in order along the processing flow. However, the present invention is not limited to this. Absent. In the present invention, the processing of the control unit may be performed by event-driven (event-driven) processing that executes processing in units of events. In this case, it may be performed by a complete event drive type or a combination of event drive and flow drive.

1 Refrigerator 2, 2a-2f Unit cooler (refrigerated indoor air conditioner)
3, 3a-3f Solenoid valve (control valve)
4, 4a to 4f Temperature sensor (temperature detector)
5, 5a Control unit 100, 101 Refrigeration system

Claims (6)

A refrigerator,
A plurality of refrigerated indoor air conditioners connected to the refrigerator;
A controller that controls on / off of the plurality of refrigerated indoor air conditioners,
The control unit is based on the operating rate of the plurality of refrigerated indoor air conditioners while controlling the timings of the on-controls of the plurality of refrigerated indoor air conditioners to be shifted from each other and the timing of the off controls to be shifted from each other. Te, a first control in which the plurality of refrigeration compartment air conditioner is all turned off, a second control for controlling so that at least one refrigeration compartment air conditioner is turned on among the plurality of refrigeration compartment air conditioner and A refrigeration system configured to selectively perform . A plurality of control valves which are provided for each of the plurality of refrigerated indoor air conditioners and which control the flow of refrigerant flowing into the refrigerated indoor air conditioners;
The control unit shifts the timings of the on-controls of the plurality of refrigerated indoor air conditioners from each other and shifts the timings of the off-controls from each other by turning on and off the plurality of control valves while shifting the timings from each other. The refrigeration system of claim 1, wherein the refrigeration system is configured to control. A plurality of temperature detection units provided for each of the plurality of refrigerated indoor air conditioners;
When the temperature detection unit detects a temperature outside the target temperature range, the control unit turns on or off the refrigerating room air conditioner corresponding to the temperature detection unit where the temperature outside the target temperature range is detected. At the same time, when temperatures outside the target temperature range are detected by the plurality of temperature detection units, the timings of the on-controls of the plurality of refrigerating room air conditioners are shifted from each other, and the timings of the off-controls are set. The refrigeration system according to claim 1, wherein the refrigeration system is configured to be controlled to be shifted from each other. Before SL control unit, by performing on-off of the refrigerating compartment air conditioner temperature outside the target temperature range corresponding to the temperature detection unit is detected, the drive number of the refrigeration compartment air conditioner, the previously determined When the number of driven units is out of the range, at least one of the refrigerating room air conditioners other than the refrigerating room air conditioner that was turned on or off immediately before is turned on or off, and the refrigerating room air conditioner The refrigeration system according to claim 3, wherein the number of drive units is controlled so as to be within the range of the predetermined number of drive units.   The controller is a refrigerated indoor air conditioner other than the refrigerated indoor air conditioner that was turned on immediately before when the number of driven refrigerated indoor air conditioners exceeds the range of the predetermined number of driven units, and Of the refrigerated indoor air conditioners in the on state, the refrigerated indoor air conditioner corresponding to the temperature measuring unit that has detected the temperature having the largest absolute value of the difference from the lower limit value of the target temperature range is turned off, and the refrigerated room When the number of driven air conditioners falls below the range of the predetermined number of driven units, it is a refrigerated indoor air conditioner other than the refrigerated indoor air conditioner that has just been turned off, and an off-state refrigerated indoor air conditioner. 5. The refrigerator indoor air conditioner corresponding to the temperature measurement unit that detects the temperature having the largest absolute value of the difference from the upper limit value of the target temperature range is turned on. Refrigerated system as described .   The controller is a refrigerated indoor air conditioner other than the refrigerated indoor air conditioner that was turned on immediately before when the number of driven refrigerated indoor air conditioners exceeds the range of the predetermined number of driven units, and Of the refrigerated indoor air conditioners in the on state, the refrigerated indoor air conditioner with the lowest operating rate is turned off, and the number of drives of the refrigerated indoor air conditioners falls below the range of the predetermined number of driven units, immediately before The refrigerated indoor air conditioner other than the refrigerated indoor air conditioner that has been turned off and is configured to turn on the refrigerated indoor air conditioner having the highest operating rate among the refrigerated indoor air conditioners that are in the off state. The refrigeration system according to claim 4.

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