Cascade Refrigeration System with Variable Flow and Single Working Substance Sharing Condenser and Evaporator
A technology of condensing evaporator and cascading refrigeration, which is applied in the direction of refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve the problems of complex system, difficult to change working medium flow control, etc., and achieve simple system structure and convenient inter-stage energy Adjustment, system simple effect
Active Publication Date: 2019-01-22
TIANJIN UNIV OF COMMERCE
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Problems solved by technology
However, since the cryogenic working medium is in a supercritical state at room temperature, an expansion vessel is usually installed in the low-temperature refrigeration system, the system is complicated and it is difficult to realize variable working medium flow control
Method used
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Embodiment 1
[0023] figure 1 It is a schematic diagram of a cascade refrigeration system with a variable flow single working medium sharing a condenser and an evaporator of the present invention, consisting of multiple refrigeration compressors 1, a condenser 3, a condensation evaporator 5, an evaporator 6, and a high-temperature stage throttle valve 4-1 It is composed of a low-temperature throttling valve 4-2, and the exhaust end of each refrigeration compressor 1 is respectively connected with a first solenoid valve 2-1 and a second solenoid valve 2-2, and each refrigeration compressor 1 The suction end of each is respectively connected with a third solenoid valve 2-3 and a fourth solenoid valve 2-4, and the first solenoid valve 2-1 connected to each refrigeration compressor 1 is connected in parallel with the condensing The inlet of the evaporator 3 is connected, and the second solenoid valve 2-2 connected to each of the refrigeration compressors 1 is connected in parallel with the inle...
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The invention discloses a cascaded refrigeration system in which a single working medium with variable flow rate shares a condenser and an evaporator. Each refrigerating compressor unit of the present invention is composed of a refrigerating compressor and four electromagnetic valves, the exhaust end of the refrigerating compressor is respectively connected to the first electromagnetic valve and the second electromagnetic valve, and the suction end of each refrigerating compressor is respectively connected to the third electromagnetic valve. The solenoid valve and the fourth solenoid valve, the first solenoid valve connected to each refrigeration compressor is connected in parallel to the inlet of the condenser, and the second solenoid valve connected to each refrigeration compressor is connected in parallel to the inlet of the condensing side of the condensing evaporator , the third solenoid valve connected to each refrigeration compressor is connected in parallel to the outlet of the evaporation side of the condensing evaporator, and the fourth solenoid valve connected to each refrigeration compressor is connected in parallel to the outlet of the evaporator; the outlet of the condenser passes through the high temperature stage The throttle valve is connected to the inlet of the evaporating side of the condensing evaporator, and the outlet of the condensing side of the condensing evaporator is connected to the inlet of the evaporator through a low-temperature throttling valve. The cascade refrigerating system of the invention is composed of a single working medium, without expansion vessels and other devices, and the system structure is simple.
Description
technical field [0001] The invention relates to a refrigeration unit, more specifically, to a multi-head cascade refrigeration cycle system, which is used to improve the efficiency of the cascade refrigeration system and to regulate the refrigerant flow rate of the refrigeration system. Background technique [0002] The single-stage compression refrigeration system is not suitable for low-temperature refrigeration systems with a compression ratio (the ratio of the discharge pressure to the suction pressure) greater than 12 due to the limitation of the suction and discharge compression ratio of the compressor. In the prior art, when the compression ratio is greater than 12, a two-stage compression refrigeration system is usually used. The two-stage compression refrigeration unit can be driven by a motor, or it can be realized by combining multiple heads. However, the high and low pressure of these two methods are interoperable, and the oil return problem of the compressor is...
Claims
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IPC IPC(8): F25B7/00F25B41/04F25B41/20
CPCF25B7/00F25B2600/25F25B41/20
Inventor 杨永安严雷李瑞申郑标帝
Owner TIANJIN UNIV OF COMMERCE