Centrifugal chiller units are vapour-compressed refrigeration, with low-temperature low-pressure refrigerant gases entering the compressor and then becoming high-temperature high-pressure gases, which are discharged from the compressor into the condenser and heat exchange with cooled water within the compressor. High-pressure refrigerant liquids that are condensed by condensers enter the evaporation unit after condensing valves are reduced by pressure. Refrigerant evaporates gas within the evaporation unit, while using evaporation subheat to reduce the temperature of frozen water and the end of the supply system. Refrigerant gas enters the compressor and starts the next cycle。
The work flow chart of the refrigerant system pipeline for chillers is as follows:
Compressor inhaler pipe: evaporationer inhaler
Compressor vents: compressor vents condensers (with exhaust anti-reversity valves)
Main supply pipe route: the condenser's main expansion valve evaporation unit (the main expansion valve controls the supply)
Lead valves for liquid tubes: condenser swelling valves (regulating lead valves for fluids based on overheating of gas to control the main expansion valves)。
Ejection fluids (spray noise reduction): a compressor exhausts (ball valves, filters, electromagnetic valves) at the bottom of the condenser, the liquid droplet of the refrigerant absorbs acoustic energy, thereby reducing the overall acoustic energy of the compressor, while also reducing exhaust overheating。
Electric jets (e. G. Electric cooling): the compressor generator at the bottom of the condenser (ball valves, electromagnetic valves, dry filters, needle valves, anti-reverse valves) enters the electrostatic cavity and is recoiled by a chiller。
(b) electric backpipes: compressor evaporation units; (dry filters)
Resilient tubes (balanced tubes): gas inhaled at the top of the pump。
The lubricant system provides the lubricant necessary for the main electrical motor, the various bearings of the compressor and the gear lubrication of the booster. The lubricant in the tank is pressured by an internal pump into the oil cooler, where the lubricant is cooled to a certain temperature (35 °c ~ 50 °c) and then passed through the oil filter and then supplied to the bearings. In order to minimize the discharge of lubricant into the main power source, the motor is then entered into the evaporation unit, with a combo seal on the inside of the bearings at both ends of the axle of the generator and into the high pressure gas seal oil from the compressor snails。
The oil circuit system provides the fleet compressor with lubrication and heat; it uses oil pressure to drive the conductor pistons, and controls the turnip opening and closing and thus the load。
(a) pipes: pumps (oil cut-off valves) compressors (oil filters)
(a) resume pipelines: gas pumps (back to gas cut-off valves) in low-speed gear tanks for compressors
(a) high-speed gear tank oil cooling
Oil refrigerator:
Plumbing: electromagnetic valves
Plumbing: water volume control valves
The centrifugal compressor uses a stand-alone fuel pump, which consists of electrics, heaters, oil separators, which enters the compressor after filtering, the temperature of which depends on the cooling effect of the cooler, and the water volume valve controls the temperature (35 °c ~ 50 °c)
Temperature and pressure sensors are present throughout the conduits of the centrifuge group, which determine the operational status of the crew by detecting the temperature and pressure values of the pipe。
A safety valve is installed on containers (e. G. Evaporationers, condensers and pumps) in the cold water unit to release to the atmosphere when the pressure inside the container is too high to reduce the pressure of the container. The safety valve is designed for two safety valves, adjusting the three cut-off valve poles, which can support the maintenance of one valve, while the other valve works。
The function of the heat expansion valve
Resilient pressure relief: when high-pressure constant-temperature liquid flows past the expansion valve, it becomes a low-temperature low-pressure refrigerant liquid that quickly evaporates into the evaporation unit, thus achieving the goal of inhaling to the outside world。
Control flow: the swelling valve controls the opening of the valve by feeling changes in the refrigerant overheating at the evaporation unit's export point, regulating the flow of refrigerants into the evaporation unit, and matching the fluid supply to the heat load of the evaporation unit. When the evaporation unit heat loads increase, the valve opening increases, and the flow of refrigerants increases, and vice versa, the flow of refrigerants decreases。
Controls overheat: the swelling valves have the function of controlling overheat in the evaporation unit, keeping the evaporation unit in full use of the heat transfer area, and preventing accidents with gas belts that damage compressors。
Return gas cut-off valve: compressor gear tank bottom returns oil here。
Oil cut-off valves: to compressors after switching pipeline roads and plates。
Oil pressure control valves: by regulating the by-product flow of the oil in the pumps, regulating the pressure for oil。
Respiratory gas is returned to the compressor inhaler。
Centrifugal compressor control logic statement:
The logic of centrifugal compressor control has been explained in detail in our previous articles, so this paper is not repeated. We have friends who need to know, click on the following links:
Detailed working principles and control logic for centrifuge compressors
Finally, look at the multi-brand centrifugal compressor graphics. If this is of help to you, please help me
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