Freon piping layout
The main feature of Freon refrigerant is that it dissolves with lubricating oil. Therefore, it must be ensured that the lubricating oil brought out from each refrigeration compressor can return to the refrigeration compressor after passing through the condenser, evaporator and a series of equipment and pipelines. from the crankcase.
(1) Basic principles
1. Ensure that each evaporator is fully supplied with liquid.
2. Avoid excessive pressure loss.
3. Prevent liquid refrigerant from entering the refrigeration compressor.
4. Prevent the lack of lubricating oil in the crankcase of the refrigeration compressor.
5. It should be able to keep airtight, clean and dry.
6. The convenience of operation and maintenance should be considered, and proper attention should be paid to neatness.
(2) Layout principles of Freon pipelines
1. Suction pipe
1) The suction pipe of the compressor should have a slope of not less than 0.01, facing the compressor, as shown in the figure.
2) When the evaporator is higher than the refrigeration compressor, in order to prevent the liquid refrigerant from flowing into the compressor from the evaporator during shutdown, the return air pipe of the evaporator should first be bent upwards to the highest point of the evaporator, and then downwards to the compressor，Suction pipe of freon compressor.
3)When Freon compressors are running in parallel, the amount of lubricating oil returned to each refrigeration compressor may not be equal to the amount of lubricating oil taken away from the compressor. Therefore, a pressure equalizing pipe and an oil balancing pipe must be installed on the crankcase so that The oil in the crankcase of the refrigeration compressor with more oil return flows into the compressor with less oil return through the oil balance pipe.
4) The freon gas in the ascending suction riser must have a certain flow rate to bring the lubricating oil back into the compressor.
5) In the system with variable load, in order to ensure oil return at low load, two rising risers can be used, and an oil collecting elbow is used to connect the two pipes. The two pipes should be connected from the upper part to the horizontal pipe connection.
6) When the return gas branch pipes of multiple groups of evaporators are connected to the same suction main pipe, different methods should be adopted according to the relative positions of the evaporators and the refrigeration compressors.
Guangxi Cooler Refrigeration Equiment Co.,Ltd.
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Post time: Feb-08-2023