The layout principle of freon refrigerant pipeline

The main feature of Freon refrigerant is that it dissolves with lubricating oil. Therefore, it must be ensured that the lubricating oil from each refrigeration compressor can be returned to all after passing through the condenser, evaporator, and a series of equipment and pipelines. Comes in the crankcase of the refrigeration compressor.　　(1) Basic Principles

　　1. Ensure that each evaporator is fully supplied with liquid.

　　2, to 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 airtight, clean and dry.

　　 6. Convenient operation and maintenance should be considered, and proper attention should be paid to neatness.

　　(2) Principles of piping layout

　　1, suction pipe

　　1) The suction pipe of the compressor should have a slope of not less than 0.01. To the compressor. .

　　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 pipe of the evaporator should first bend upward to the z* high point of the evaporator. Then pass down to the compressor.

　　 Freon compressor suction pipe

When 　　 Freon compressors are operated in parallel, the lubricating oil returned to each refrigeration compressor is not necessarily the same as the lubrication taken away from the compressor The amount of oil is equal, therefore, a pressure equalizing pipe and an oil balance 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 rising suction standpipe must have a certain flow rate in order to bring the lubricating oil back into the compressor.

　　5) In a variable load system, in order to ensure that the oil can be returned even under low load, two rising risers can be used, and the two pipes are connected by an oil collecting elbow. The pipes should be connected to the horizontal pipe from above.

　　6) When multiple sets of evaporator return air branch pipes are connected to the same suction main pipe, different methods should be adopted according to the relative position of the evaporator and the refrigeration compressor.

　　2, exhaust pipe

　　 1) In order to prevent lubricating oil or liquid that may condense from flowing back to the compressor, the exhaust pipe of the refrigeration compressor should have a slope of 0.01～0.02 , Slope oil separator or condenser.

　　2) When the oil separator is not used, if the compressor is lower than the condenser, the exhaust pipe should be designed as a U-shaped bend, as shown in the figure, to prevent condensation of liquid refrigerant and lubrication The oil flows back to the refrigeration compressor

　　3. The pipe from the condenser to the accumulator

　　1) There are two ways to connect the liquid pipe between the condenser and the accumulator. Type;

　　2) The pipe diameter of the straight-through liquid receiver should be selected according to the liquid flow rate not greater than 0.5m/s when operating at full load. .

　　3) The inlet valve z* of the liquid reservoir is preferably an angle valve (the resistance of the angle valve is small).

　　4) The liquid receiver should be lower than the condenser, and the distance between the center of the angle valve and the condenser liquid outlet should be no less than 200mm.

　　5) When a straight-through liquid reservoir is used, the supercooled liquid from the condenser will lose the degree of supercooling after entering the liquid reservoir.

　　6) There is a balance pipe at the top of the wave-type accumulator communicating with the top of the condenser, and liquid refrigerant enters and exits from the bottom of the accumulator to adjust and stabilize the refrigerant circulation.

　　7) The liquid refrigerant from the condenser can directly reach the expansion valve through the liquid pipe.

　　8) The height difference between the condenser and the wave accumulator should be greater than 300mm, z* the flow rate of the liquid refrigerant in the pipeline and the necessity of the condenser liquid outlet to the liquid level of the accumulator when the load is large The height difference H value is shown in the table.

　　The liquid flow rate and height difference H value in the pipeline

　　4, the pipeline between the condenser or the liquid reservoir and the evaporator

　　1) To avoid If flash gas is generated in the liquid pipe, the liquid supply pipe from the liquid reservoir and the suction pipe of the compressor should be pasted together, and heat insulation materials should be used for heat preservation;

　　2) The evaporator is located in the condensation If there is no solenoid valve installed on the liquid pipe under the device or liquid reservoir, the liquid pipe should be equipped with an inverted U-shaped liquid seal, and its height should not be less than 2m.

　　3) When multiple evaporators of different heights are located on the condenser or liquid reservoir, in order to avoid the flash gas that may be formed enters an evaporator with z* height, the method should be as shown in the figure take over.

　　4) The air flow direction of the direct evaporative air cooler should be such that the hot air is in contact with the evaporator outlet pipe.

　　5) Freon cooling pipes supplied with thermal expansion valves generally adopt the form of top in and bottom out to ensure oil return. The cascade pipes should keep the liquid supply mode of the rear set of pipes z* as top in and bottom out.

　　6) The cooling pipes can be connected in series when the pressure drop allows. Freon cooling pipes supplied by thermal expansion valves generally adopt the form of top in and bottom out to ensure oil return. Tandem piping As long as the liquid supply mode of a group of piping after z* is maintained as top in and bottom out, it is not required that each group of piping adopts the liquid supply mode of top in and bottom out.

　　 Freon refrigeration system piping commonly used copper pipes or seamless steel pipes, generally use copper pipes when the pipe diameter is less than 20mm, and use seamless steel pipes when the pipe diameter is larger. The pipes of the ammonia refrigeration system are all seamless steel pipes.

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