Low-temperature oil freezing prevention self-cascade refrigerating system and control method thereof

A technology of refrigeration system and antifreeze oil, applied in refrigerators, refrigeration components, refrigeration and liquefaction, etc., can solve problems such as lubricating oil ice blockage

Active Publication Date: 2016-10-12
HISENSE RONSHEN GUANGDONG FREEZER +1
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  • Abstract
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Problems solved by technology

[0005] The embodiment of the present invention provides an anti-low temperature freezing oil self-cascading refrigeration system and its control method, which can solve the problem that lubricating oil enters the evaporator unit through the intermediate regenerator to form ice blockage of lubricating oil

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  • Low-temperature oil freezing prevention self-cascade refrigerating system and control method thereof
  • Low-temperature oil freezing prevention self-cascade refrigerating system and control method thereof

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Embodiment Construction

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0030] In the prior art, in the self-cascading refrigeration system, with the operation of the system, the lubricating oil inside the compressor will also flow in the compressor, condenser, intermediate regenerator, and evaporator unit together with the refrigerant working fluid. Circulating flow in the pipeline. Since the differential pressure push of the system is continuous, the lubricating oil will not end up stagnant in the evaporator unit. When the syst...

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Abstract

The embodiment of the invention provides a low-temperature oil freezing prevention self-cascade refrigerating system and a control method thereof and relates to the technical field of refrigerating. The problems that lubricating oil enters an evaporator unit through an intermediate heat regenerator and lubricating oil ice blockage is caused can be solved. The system comprises a compression refrigerating device, an intermediate heat regenerator, a first throttling unit and an evaporator unit. A heat flow inlet of the intermediate heat regenerator is connected with a first outlet of the compression refrigerating device through a pipeline, and a heat flow outlet of the intermediate heat regenerator is connected to an inlet of the evaporator unit through the first throttling unit. A first cold flow inlet of the intermediate heat regenerator communicates with an outlet of the evaporator unit through a pipeline, and a cold flow outlet of the intermediate heat regenerator is connected with an inlet of the compression refrigerating device through a pipeline. A second outlet of the compression refrigerating device communicates with a second cold flow inlet of the intermediate heat regenerator through an oil freezing prevention unit. After the system is started, the oil freezing prevention unit is started to be in a bidirectional connecting state, and after the system is shut down, the oil freezing prevention unit is turned off to be in a unidirectional connecting state.

Description

technical field [0001] The invention relates to the technical field of refrigeration, in particular to an anti-low temperature freezing oil self-cascading refrigeration system and a control method thereof. Background technique [0002] Cascade refrigeration cycles are widely used to obtain lower temperatures. The cascade refrigeration cycle is composed of a classic cascade refrigeration cycle and a self-cascade refrigeration cycle. In the classic cascade refrigeration cycle, the increase in the number of cascade stages will make the structure more complicated, the efficiency lower, and the cost increased. The self-cascading refrigeration system has become a research hotspot due to its simple structure, high reliability, long life, and low cost. The self-cascade refrigeration system is mainly used to obtain the temperature below -40°C. It adopts the method of single-stage compression, natural separation, and multi-stage cascade of a single compressor and mixed working fluid....

Claims

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Application Information

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IPC IPC(8): F25B7/00F25B41/06F25B41/04F25B40/06F25B43/00F25B49/02F25B41/20F25B41/37
CPCF25B7/00F25B40/06F25B43/00F25B49/02F25B41/30F25B41/20
Inventor 付志明刘金平朱宝平潘垚池许雄文
Owner HISENSE RONSHEN GUANGDONG FREEZER
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