Control device and control method for extraction device

Abstract

The purpose of the present invention is to provide a control device which is for an extraction device, and is capable of estimating the total amount of air intrusion more accurately and optimizing the operation of the extraction device. A control device (7) that controls an extraction device (6) provided in a refrigerator (1) is provided with: an estimating unit that estimates the total amount of air intruding into the refrigerator (1); a determining unit that determines whether or not the total amount of air intrusion is equal to or greater than a preset allowable value; an activation control unit (6) that determines an activation duration time of the extraction device (6) on the basis of the total amount of air intrusion when the total amount of air intrusion is equal to or greater than the allowable value, and that activates the extraction device (6) for the activation duration time; an exhaust air amount calculation unit that calculates an amount of exhaust air that is the amount of air actually exhausted by the extraction device (6); and a correction unit that corrects at least one among the total amount of air intrusion and the activation duration time when the difference between the total amount of air intrusion and the amount of exhaust air is equal to or larger than a predetermined amount.

1 . A control device that controls an extraction device provided in a chiller, the control device comprising:
 an estimating unit that estimates a total amount of infiltrated air into the chiller;   a determination unit that determines whether or not the total amount of infiltrated air is equal to or larger than an allowable value set in advance;   a starting control unit that determines a starting continuation time of the extraction device based on the total amount of infiltrated air and starts the extraction device for the starting continuation time in a case where the total amount of infiltrated air is equal to or larger than the allowable value;   a discharge air amount calculating unit that calculates a discharge air amount, which is an amount of air actually discharged by the extraction device; and   a correcting unit that corrects at least any one of the total amount of infiltrated air and the starting continuation time in a case where a difference between the total amount of infiltrated air and the discharge air amount is equal to or larger than a predetermined amount.   
     
     
         2 . The control device according to  claim 1 ,
 wherein the correcting unit corrects at least any one of the total amount of infiltrated air and the starting continuation time by multiplying the total amount of infiltrated air or the starting continuation time by a correction constant according to the difference between the total amount of infiltrated air estimated by the estimating unit and the discharge air amount.   
     
     
         3 . The control device according to  claim 2 ,
 wherein the correction constant is a value obtained by dividing the discharge air amount by the total amount of infiltrated air.   
     
     
         4 . The control device according to  claim 1 ,
 wherein the chiller is divided into a plurality of sections,   an air infiltration effect degree is set for each of the sections,   the estimating unit estimates an air infiltration amount for each of the sections and estimates the total amount of infiltrated air of the entire chiller from the estimated air infiltration amount of each of the sections, and   the correcting unit corrects the air infiltration amount for each of the sections according to the air infiltration effect degree in a case of correcting the total amount of infiltrated air.   
     
     
         5 . A chiller that adopts a low-pressure low-GWP refrigerant, the chiller comprising:
 an extraction device; and   the control device according to  claim 1 .   
     
     
         6 . A control method for an extraction device provided in a chiller, the control method comprising:
 an estimation step of estimating a total amount of infiltrated air into the chiller;   a determination step of determining whether or not the total amount of infiltrated air is equal to or larger than an allowable value set in advance;   a starting control step of determining a starting continuation time of the extraction device based on the total amount of infiltrated air and starting the extraction device for the starting continuation time in a case where the total amount of infiltrated air is equal to or larger than the allowable value;   a discharge air amount calculation step of calculating a discharge air amount, which is an amount of air actually discharged by the extraction device; and   a correction step of correcting at least any one of the total amount of infiltrated air and the starting continuation time in a case where a difference between the total amount of infiltrated air and the discharge air amount is equal to or larger than a predetermined amount.   
     
     
         7 . A chiller that adopts a low-pressure low-GWP refrigerant, the chiller comprising:
 an extraction device; and   the control device according to  claim 2 .   
     
     
         8 . A chiller that adopts a low-pressure low-GWP refrigerant, the chiller comprising:
 an extraction device; and   the control device according to  claim 3 .   
     
     
         9 . A chiller that adopts a low-pressure low-GWP refrigerant, the chiller comprising:
 an extraction device; and   the control device according to  claim 4 .