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Basic layout and installation of refrigeration piping taboo
Release time:2016-10-17 15:31:33
Freon refrigerants and lubricants dissolve each other are the main features. Therefore, when you are decorating the refrigeration piping, must be from each of the refrigeration compressor with oil after the condenser, evaporator and after a series of equipment, pipes, all the way back to compressor crankcase.
Suction pipe
(1) taking into account the continuing flow of oil from evaporator compressor compressor suction pipe should be not less than 0. 01 gradient, slope to the compressor.
(2) when the evaporator is above refrigeration compressors, in order to prevent downtime liquid refrigerant from the evaporator into the compressor, evaporator suction tube should bend upwards from the evaporator, the highest point, then down through to the compressor.
(3) when freon refrigeration compressors in parallel operation, go back to each of the refrigeration compressor lubricants may not be equal to the amount of lubricating oil and away from it, pipe must be equipped with pressure in the crankcase and oilpipes, making oil more everyone by balancing the flow of oil in the refrigerant compressor oil less compressor.
(4) increase freon gas in the vertical suction pipe must have a certain flow rate, canbring the oil back to the compressor.
(5) in the refrigeration system of variable load, in order to ensure oil return at low load, may need to use very small pipe diameter, especially energy adjustment range islarger, more prominent. In order to avoid pressure drop at full load is too large, twoup riser, between the two pipes with a set of oil elbow connection.
(6) multi-evaporator return air duct is connected to the same when the suction ductshould be based on the relative position of the evaporator and compressor to takea different approach.
Exhaust pipe
(1) in order to prevent oil or condensing liquid flow back into the compressor, compressor exhaust pipe O.O1 ~0.02 slope, slope oil separator or condenser.
(2) when the individual oil separator, if the compressor is below the condenser, exhaust pipe design into a u-shaped pipe to prevent condensation of liquid refrigerant and lubricant to flow back into the compressor.
Refrigeration piping layout
(1) ensure the adequate supply of each evaporator.
(2) to avoid excessive pressure loss.
(3) to prevent liquid refrigerant into the refrigeration compressor.
(4) to prevent the loss of refrigeration compressor oils.
(5) should be able to keep the air-tight, clean and dry.
(6) should be considered convenient operation and maintenance, and with due regard for order.
Installation of air conditioning and refrigeration piping taboo
Taboo: refrigeration piping installation without doing a clean, dry
Refrigeration piping installation prior to cleaning, drying, in addition to increasing pollution blowing workload of the system after installation, also affects the normal operation of the system. Refrigeration compressor cylinder wear and caused partial blockage problems.
Refrigeration piping installation without the reasons for cleaning, drying, due to construction quality acceptance of construction workers failed to comply with specifications and installation of cooling pipe technology standard. Before the correct way is to install refrigeration piping inner wall must be rust, washing and drying, so you canhave the system after the installation conditions of the commissioning. Tube descaling methods in actual rust method, according to the refrigeration system characteristics as well as different materials used different ways of rust-rust.
Taboo II: the bending radius of the pipe and tee interface does not meet the requirements
Refrigeration and tee with pipe bending radius interface does not meet the requirements, will increase the system's resistance, reduce the cooling effect of refrigeration systems.
The bending radius of the pipe and three-way interfaces do not meet requirementsreasons, construction workers still follow the General construction technology of pipeline design, construction management, technical measures lack refrigeration pipingor the appropriate installation standards.
Refrigeration piping bends and tees shall meet the following requirements:
1, refrigeration piping bends as far as possible with cold bending made by simmering, prevent oxidation due to heating or sand embedded in the walls of the tube increases the dirt in the system. Bending radius of curvature equal to or greater than theintake pipe diameter 3.5 back.
2, the refrigeration pipeline cannot be welded pipe bending and clamping down onbends.
3, refrigeration piping tees interface, you cannot use the "t"-shaped three-way, smooth siphon should be used.
Taboo III: refrigeration piping and refrigeration compression time of slope and aspect does not meet the requirements
Refrigeration compression refrigeration piping and slope and aspect does not meetthe requirements of the time, will allow the refrigeration system is not running properly or even fatal accidents.
Refrigeration piping and refrigeration compression time of slope and aspect does not meet the requirements of reason is due to the construction workers had not seriously implemented construction quality approval standard and refrigeration pipe construction craft standard. Construction site management and technical supervision should be strengthened.
Taboo IV: laying the refrigeration piping and refrigeration accessories do not meet the requirements
Laying the refrigeration piping and refrigeration accessories do not meet the requirements will affect the normal operation of the refrigeration system and reduce cooling capacity.
Refrigeration piping and refrigeration accessories installation method does not meet the requirements of reason is due to an earnestly familiarity with drawing of pipe required elevation, aspect, slope, and other key data, resulting in inconsistent with the plans, as before the test run cannot be found and corrected in a timely manner, the system will not run properly.