Refrigeration cycle system adopting double heat exchange

Abstract

The invention discloses a refrigeration cycle system adopting double heat exchange. The refrigeration cycle system comprises a plate heat exchanger, a major cycle pipeline circulating pump, a low-temperature pneumatic ball valve I, a low-temperature pneumatic ball valve II, a minor cycle circulating pump, a heater, a one-way valve and pipes. The refrigeration cycle system is characterized in that all the members are connected through pipelines; in pre-freezing of the earlier stage, the major cycle pipeline circulating pump and the low-temperature pneumatic ball valve I are turned on and opened to form a major cycle channel with a front box shelf and a condenser cooling coil integrated; in primary drying, the low-temperature pneumatic ball valve I is closed, and the minor cycle pipeline circulating pump and the low-temperature pneumatic ball valve II are turned on and opened to form two minor cycle channels with respective cycles in the front box shelf and the condenser cooling coil. According to the refrigeration cycle system, through on-off fit of the pipes, motors and the valves of the cycle system, a heat transfer medium, namely silicone oil, is used for cooling the front box shelf of a vacuum freezing drier or cooling the condenser cooling coil. Precise control over the temperature of the shelf and the temperature of a condenser is achieved through matching of the motors and the valves of the cycle system.

Description

technical field [0001] The invention relates to the field of refrigeration, in particular to a double heat exchange refrigeration cycle system. Background technique [0002] At present, most of the traditional freeze dryers are direct-injection refrigeration methods. During the entire operation stage of the freeze-drying process, the refrigerant is generally circulated directly into the cooling tube to directly expand and absorb heat, so as to achieve the cooling effect. During the freeze-drying process, the cooling object is switched by switching the refrigerant circuit, and the temperature of the shelf is generally controlled and adjusted by a cooling liquid supply solenoid valve. [0003] The existing direct-injection refrigeration methods of vacuum freeze dryers generally have the following defects: [0004] 1) When pre-freezing, the shelf cooler is used to cool the plate layer, so before entering the drying stage, the refrigerant circuit must be switched to the condens...

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Problems solved by technology

[0005] 2) The shelf temperature control performance is low, the compressor is poorly adapted to load changes, and the operation stability is reduced to a certain extent;

[0006] 3) Since there is only refrigerant in the condenser and the heat capacity is relatively small, the refrigeration system is prone to failure, resulting in rapid temperature rise and rapid vacuum destruction;

[0007] 4) Due to the process structure, the temperature of the condenser is not easy to control, and it is not easy to use the method of heating silicone oil to run the defrosting project

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