Double heat exchange refrigeration cycle system

Abstract

The invention discloses a double heat exchange refrigeration cycle system, including a plate exchanger, a large circulation pipeline circulation pump, a low-temperature pneumatic ball valve I, a low-temperature pneumatic ball valve II, a small circulation pipeline circulation pump, a heater, a one-way valve and Pipeline, which is characterized in that: all components are connected by pipelines, and when pre-freezing in the early stage, the circulation pump of the large circulation pipeline and the low-temperature pneumatic ball valve I are turned on to form a large circulation channel integrating the front box shelf and the condenser cooling coil; once dried , close the low-temperature pneumatic ball valve I, open the small circulation pipeline circulation pump and low-temperature pneumatic ball valve II to form two small circulation channels for the front box shelf and the condenser cooling coil. In the present invention, the heat transfer medium silicon oil is used to cool the shelf of the front box of the vacuum freeze dryer or the cooling coil of the condenser through the cooperation of the pipes of the circulation system and the switches of the motors and valves. The precise control of the temperature of the shelf and the temperature of the condenser is realized through the mutual cooperation of the motors and valves of the circulation 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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