Refrigeration screw compressor because of its large refrigerating capacity, wearing parts less, long maintenance cycle, high volumetric efficiency, exhaust temperature is low and the liquid hammer insensitive and can realize refrigerating capacity stepless regulation characteristics become refrigeration compressor market a dark horse. Become a cold storage, cold chain, refrigeration, refrigeration and other commercial industrial refrigeration field of the latest rookie rookie". With the application of screw compressor products more and more widely, do you really master the use of screw refrigeration compressor know-how?  Screw refrigeration compressor before the boot is very necessary to check
Refrigeration express reporter suggested that everyone in the use of screw compressor when the boot check essential, which is very important to ensure the normal operation of the refrigeration system.
Examination of specific as follows: operational records check, understand last stoppage reasons and time, if it is normal to shut down, and continuous stop time is not more than a month can boot according to the normal operation rules; if continuous stop for more than a month or repair after the boot, by the head of the room under the auspices of the boot. Check the system, low-pressure circulation barrel and intercooler level whether between 30% ~ 50%, if the level is too high should be first open the ammonia pump to the system for liquid or through a discharge valve to discharge liquid barrel liquid discharge, liquid is reduced to below 50%. Check the compressor, and check the oil level is in oil mirror less than 1 / 2 and a lower oil mirror more than 1 / 2; check the level indicator is in "0" bit; check the compressor valve state, including meter valve. All the above tests are normal, you can start the boot.
Screw refrigeration compressor manual and automatic starting procedure
According to refrigeration express reporter learned that the power of the screw refrigeration compressor is divided into two types of manual and automatic.
The manual boot steps are as follows: start the cooling water pump and a coolant pump, supply water to the condenser and evaporator; open exhaust valve of compressor; start the pump; compressor unloading to "0"; after 30 seconds of running the oil pump, oil pressure and exhaust pressure difference to 0.4~0.6MPa, press the start button of the compressor, the compressor start, also bypass electromagnetic valve A is automatically opened. After the normal operation of the motor, A valve is automatically closed; observe the suction pressure meter, and gradually open the suction valve and manual loading, pay attention to the inspiratory pressure should not be too low. After entering the normal operation of the compressor, adjust the hydraulic control valve, so that the oil pressure difference is 0.15~0.3MPa; check the pressure of the parts of the equipment, temperature, especially the temperature of moving parts is normal. If there is any abnormal situation, should stop the inspection.
Automatically boot steps are as follows: open exhaust valve of compressor, start the cooling water pump and a coolant pump; compressor start button, then pump automatically put into operation, slide valve automatically return "0". After the oil pressure difference is established, the time delay is about 15 seconds, the main motor is started automatically, and the bypass solenoid valve A is automatically opened. After the normal operation of the motor, the A valve is automatically closed; when the main motor starts, it should be slow to open the suction valve at the same time, otherwise the high vacuum will increase the vibration and noise of the machine. Compressor will be automatically added to 100%, to enter the normal working state. According to the pressure setting or refrigerant temperature setting value automatically adjust the load position.
Screw refrigeration compressor how to stop?
Screw refrigeration compressor shutdown is also divided into two types of manual and automatic.
The manual shutdown steps as follows, shutdown sequence for unloading, stop main engine, close the suction stop valve, stop pump, water supply pump. Press the host to stop button, the bypass solenoid valve B automatically open, shut down after the B valve automatically closed.
Automatic shutdown steps are as follows: according to the compressor stop button, slide valve automatically returned to "0", the main motor automatically stops, and B of bypass electromagnetic valve automatically opens, the pump automatically stop the delay, automatically shut down after the shutdown valve B; close the suction stop valve. Such as long-term shutdown, exhaust valve should also be closed; shut down the pump power supply and compressor power switch.
Screw refrigeration compressor operation in the attention of what?
Should observe the suction and exhaust pressure, exhaust temperature, oil temperature and oil pressure of the compressor operation, and record. The instrument is accurate. Compressor operation in the process because of a security action automatically stop, we must identify the cause of the fault can be boot. By no means to change their settings or the method of shielding failure again. When the power failure caused by the failure of the mainframe, due to bypass solenoid valve B can not be turned on, the compressor may be turned upside down phenomenon, then quickly shut down the suction valve, reduce the upside. If the temperature is lower than the season for a long time down, should be all the water in the system to put a net, to avoid freezing equipment. If the temperature is low in the season, the first open pump, according to the motor rotating steering wheel shaft coupling, so that the oil in the compressor cycle, full lubrication, the process must be carried out in a manual mode. Unit long-term shutdown, should every 10 days or so to open a pump, ensure the compressor in various parts of the lubrication oil, each pump start 10 minutes; every 2-3 months to start a compressor, 1 hour each time to ensure moving parts do not stick together. Before each boot, the best disk moving compressor a few laps, check whether the compressor has a card resistance, and make the lubricating oil evenly distributed parts.
What is the state of the normal operation of the refrigeration system?
Air conditioning and refrigeration big market experts said, should be judged from many aspects. For example, from the air breathing, the general should be controlled at 1/3 of the absolute value of the evaporation temperature, and not less than 5. Because the screw machine is not sensitive to the wet stroke, air breathing over the heat generally controlled at 5. From the condensing temperature, the vertical and horizontal condenser is higher than the temperature of the cooling water outlet. 4 to 6 DEG C; the use of evaporative condenser wet bulb temperature high 6 ~ 10 degrees Celsius. From the freezing water temperature (brine temperature), than the evaporation temperature of 4 ~ 6. From the cold storage room temperature, direct evaporation type than the evaporation temperature high 8 to 12 DEG C; exhaust pressure is slightly higher than the condensation pressure; suction pressure is slightly lower than the evaporation pressure; exhaust temperature is less than 105 degrees Celsius (screw machine); injection temperature is not more than 60 DEG C; injection pressure, screw machine than the exhaust pressure high 0.15 ~ 0.30 MPa. |
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