Cooling storage

Abstract

The present invention provides a cooling storage unit that can control the rotation speed of the compressor so that the temperature inside the cooling duct approaches a preset target temperature. [Solution] The system comprises a cold air supply device 17 that supplies cold air into a cooling duct 40, a duct temperature sensor 18 that measures the temperature inside the cooling duct 40, and a control unit 19. The cold air supply device 17 includes a compressor 22. The control unit 19 performs the following: a first process in which, when condition (1) is met, a numerical value X1 is accumulated at predetermined time intervals S1, and the rotational speed of the compressor 22 is increased when the accumulated value is less than or equal to a predetermined value D1; a second process in which, when condition (2) is met, a numerical value X2 is accumulated at predetermined time intervals S2, and the rotational speed of the compressor 22 is decreased when the accumulated value is greater than or equal to a predetermined value D2; and a third process in which, when condition (3) is met, a numerical value X3 is accumulated at predetermined time intervals S3, and the rotational speed of the compressor 22 is decreased when the accumulated value is greater than or equal to a predetermined value D3.

Claims

1. A box with thermal insulation properties, An interior box is positioned inside the box, forming a cooling duct that serves as a passage for cold air between it and the box, and its interior is a storage room. A cooling air supply device that supplies cold air into the cooling duct, A duct temperature sensor for measuring the temperature inside the cooling duct, It comprises a control unit and, The cold air supply device comprises a compressor, a condenser, a cooler, and a refrigerant pipe that circulates the compressor, the condenser, and the cooler and is filled with refrigerant. When the temperature inside the cooling duct measured by the duct temperature sensor is defined as the duct temperature measurement value TS, and the preset target temperature inside the cooling duct is defined as the target temperature TM, The control unit performs a first process in which, when the following condition (1) is met, it accumulates a numerical value X1 calculated by the following formula (1) at predetermined time intervals S1, and when the accumulated value is less than or equal to a predetermined value D1, it increases the rotational speed of the compressor. If the following condition (2) is met, the numerical value X2 calculated by the following formula (2) is accumulated at predetermined intervals S2, and when the accumulated value is equal to or greater than a predetermined value D2, the second process is performed to reduce the rotational speed of the compressor. A cooling storage facility that, when the following condition (3) is met, performs a third process in which a numerical value X3 calculated by the following formula (3) is accumulated at predetermined intervals S3, and when the accumulated value is equal to or greater than a predetermined value D3, the rotation speed of the compressor is reduced. Condition (1): TM<T2<TM+predetermined value A1 Condition (2): TM - predetermined value A2 ≤ T2 ≤ TM Condition (3): TM-predetermined value A3<T2<TM-predetermined value A2 Numerical value X1 = T1 - T2 - predetermined value B1 ... Formula (1) Numerical value X² = T1 - T² ... Formula (2) Numerical value X3 = T1 - T2 + predetermined value B2 ... Formula (3) However, in the above conditions (1) to (3) and the above formulas (1) to (3), A1 > 0 A2 > 0 A3 > 0 A3 > A2 B1 > 0 B2 > 0 T1: Duct temperature measurement value TS before a predetermined time S4 T2: Current duct temperature measurement TS That is the case.

2. The cooling storage unit according to claim 1, wherein the control unit sets the predetermined value B1 when the following condition (5) is met to a value smaller than the predetermined value B1 when the following condition (4) is met, and then performs the first process. Condition (4): TM+predetermined value A4<T2 Condition (5): TM ≤ T2 ≤ TM + predetermined value A4 however, A4 < A1 A4 > 0 That is the case.

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