1, the compressor should be used to lift more than the weight of the unit weight lifting equipment, lifting speed, acceleration should be limited to the permissible range of speed, acceleration should be limited to the permissible range of speed. Compressor should be lifted by lifting equipment with a capacity greater than the weight of the unit, and the lifting speed and acceleration should be limited to the permitted range.
2, try to install the compressor in a cool, clean, well-ventilated place to ensure that the compressor inhalation air clean and moisture content is minimal.
3, the compressor inhalation air is not allowed to contain flammable gases and corrosive gases, so as not to cause an explosion or internal corrosion. 4, air-cooled machine should have an exhaust fan or duct hot air out of the outdoor, to avoid hot air circulation to the air inlet.
5, the compressor sewage, waste oil emissions should comply with local environmental protection departments.
6, water-cooled machine cooling water quality should meet the following requirements:
(1), the total hardness of C a C O 3 to indicate that it should be less than 1,000 P P M (1,000 mg ／ liter)
(2), the PH value of 6.0 to 8.0 between
(3), the water quality of the compressor, the compressor should not be used as a cooling water. 0 ~ 8.0 between
(3), suspended solids do not exceed 50 P P M (50 mg / liter)
Poor quality cooling water will reduce the cooling effect of the cooler, and seriously lead to the failure of the entire cooler can not be used.
7, this series of machines use 50 Hz three-phase alternating current power supply, voltage determined by the user when ordering, 3 80 V, 6k V, 10k V, etc., the control power supply using a single-phase alternating current power supply 220 V, 50 Hz, and requires a reliable grounding, high-voltage electrical strictly in accordance with the relevant high-voltage electrical operating procedures.
8, before starting the compressor, read the manual page 20 "compressor start" compressor, cooling, the fan must run in the specified direction (cooling fan steering should be referred to the motor on the logo), otherwise the compressor may be caused by oil shortage or temperature rise.
9, when the compressor is in remote control, the machine may start at any time, should be listed to remind.
The maintenance of the compressor must be carried out under the guidance of qualified personnel.
1, must use the correct tools.
2. Use the original spare parts, otherwise the machine will break down easily.
3, must use the correct special screw compressor synthetic oil, otherwise the oil does not meet the requirements of the machine failure caused by 4, the compressor is working, the exhaust temperature of about 1,000 ℃, some parts of the hot, please do not touch these parts to avoid burns.
5, when it is necessary to repair the machine, you must cut off the main power supply, shut down the connection with the external air circuit, and ensure that the system has no pressure, no high temperature before proceeding.
Principle of operation Screw compressor is a volumetric compressor, the compression of air by the device in the casing of the parallel meshing with each other, the volume of the groove of the yin and yang rotor to achieve the change. The rotor rotates in the casing, which is precisely matched to the rotor, so that the gas between the teeth of the rotor grooves continuously generates periodic volume changes along the axis of the rotor, and is pushed from the suction side to the discharge side, completing the three working processes of suction, compression, and exhaust. Air flow Air → Air filter → Load reducing valve → Main unit → Check valve → Oil-air separator → Minimum pressure valve → Aftercooler → Air-water separator → Outlet (air supply) Water separated from the air-water separator is discharged through the drain solenoid valve. Lubricating oil flow Lubricating oil → separator tank → temperature control valve → oil cooler or bypass → oil filter → oil stop valve → main unit The air + oil mixture changes direction and turns in the separator tank, most of the oil is separated, and a small portion of the remaining oil is separated through the oil separator, and this portion of the oil is drawn out by the pipe inserted in the oil separator and flows into the low-pressure part of the main unit through the throttling check valve. Throttle check valve throttle effect is to make all the separated oil is pumped out in time, without letting go of too much compressed air, if the throttle hole is blocked, the oil will be accumulated in the oil separator, will seriously affect the separation effect; throttle check valve another role is to prevent the host machine lubricating oil backflow into the oil separator during the shutdown. The hot oil in the separator tank flows into the temperature control valve, which controls the ratio of oil flow to the cooler and bypass oil according to the temperature of the oil flow, in order to control the exhaust temperature from being too low, and too low an exhaust temperature will cause moisture in the air to be precipitated in the separator tank, emulsifying the oil and preventing it from continuing to be used, and then finally the oil is sprayed through the filter into the main unit. Lubricating oil circulation is maintained by the pressure difference between the separator tank and the host low-pressure chamber, in order to maintain oil circulation during machine operation, it is necessary to ensure that the separator tank always has 0.2-0.3MPa pressure, the minimum pressure valve is to play this role.
12 Air Filter The air filter is mainly composed of a paper filter element and a housing. Air through the microporous paper filter element, so that dust and other solid impurities filtered in the outer surface of the filter core, not into the compressor host to prevent wear and tear of the relative moving parts and lubricating oil to accelerate oxidation. Therefore, the paper filter element should be cleaned or replaced in a timely manner, depending on the environment and time of use. The cleaning method is to take out the filter element and gently knock on the upper and lower surfaces to remove the dust and dirt on the filter element. Do not brush with oil or water. If the filter paper is torn or dusty and the clogging is so severe that it cannot be removed, the filter element must be replaced with a new one. Load-reducing valve The load-reducing valve is mainly composed of valve body, valve, piston, cylinder, spring, sealing ring, etc. There is an integrated control block on the end face, and there is a bleeder valve and control solenoid valve on the upper side, which integrates the functions of on-off adjustment and stopping and bleeding, etc. When the compressor starts up, the load-reducing valve will be closed when the compressor stops. When the compressor is started, the valve is closed to reduce the starting load of the compressor; when the pressure exceeds the rated discharge pressure, the microcomputer controller sends out a signal to make the solenoid valve is de-energized, the valve is closed, so that the compressor is in the no-load state until the pressure is reduced to the specified value, the valve opens, the compressor and enter normal operation, this process is called on-off regulation. A small portion of the gas is released through the small hole in the valve during the load shedding to balance the suction volume of the small hole in the load reducing valve, so that the pressure in the separator tank remains at 0.2-0.3MPa, to maintain a normal lubricating oil cycle The opening and closing action of the load reducing valve is controlled by the regulating system of electronic controllers and solenoid valves mounted in the end face of the valve; automatic control of the valve's opening and closing action of the valve. Whether flexible, the reliability of the compressor is very important, therefore, the relief valve should be maintained on a regular basis to maintain a good working condition, maintenance, the parts must be removed to check the wear and tear of the friction surface, pay special attention to check the surface of the rubber sealing ring, such as damage or cracks, it is necessary to replace the new parts, in the re-installation of the parts should be cleaned up, the friction surface of the metal parts should be coated with lubricating oil.
13 oil and gas separator oil separation part is mainly composed of separating oil tank and oil fine separator, from the host exhaust port of the oil and gas mixture into the oil separator tank space, after changing the direction, the role of the turn, most of the oil gathered in the lower part of the tank, containing a small amount of lubricating oil compressed air through the oil fine separator so that lubricating oil to obtain full recovery, the lubricating oil collected by the oil fine separator is inserted into the tube inside the oil fine separator, and the oil fine separator is inserted into the oil fine separator, and the oil fine separator is inserted into the oil fine separator. The lubricating oil collected by the separator is pumped out by the tube inserted into the separator and flows into the low pressure part of the main unit through the throttling check valve. The upper part of the oil separator tank is equipped with a safety valve, when the pressure inside the container is too high, the air will be released through the safety valve to ensure the safe use of the compressor. The lower part of the oil separator tank is equipped with a refueling port and an oil marking, the oil level must be kept in the middle of the oil level indicator after the machine is started. The differential pressure transmitter is used to detect the clogging of the oil separator. When the oil separator is seriously clogged, the indicator light of the differential pressure transmitter will come on and the filter element should be replaced. After the compressor has stopped working for a period of time, the moisture in the air will condense and deposit at the bottom of the separator tank, so the moisture should be discharged frequently through the oil drain valve installed at the bottom of the separator tank to prolong the service life of the lubricant. In the process of using, if there is a large amount of oil in the exhaust gas, you should check whether the oil pumping pipe and throttle check valve are smooth. If there is no problem, take out the separator and check it. If there is any damage that causes a short circuit of filtration or serious clogging, it must be replaced with a new product. Minimum pressure valve The minimum pressure valve consists of valve body, valve spool, spring, sealing ring, etc. It is installed at the outlet of the oil separator, and its function is to keep the pressure inside the oil separator tank from dropping below 0.25-0.4MPa, which enables the compressed air containing oil to be well separated inside the separator and reduces the loss of lubricating oil. At the same time, the gas pressure required to build up oil pressure is guaranteed. The minimum pressure valve also serves as a check valve to prevent backflow of compressed air in the system during shutdown. The minimum pressure valve is pneumatically operated and the opening pressure is set by the pressure reducing valve 22, which is adjusted at the factory. The function of the cooler is to cool the compressed air and lubricating oil discharged from the compressor. The air-cooled units use plate-fin coolers, which are all made of welded aluminum alloy, while the water-cooled units use high-efficiency copper tubular coolers, whereby most of the heat generated by the compressor is carried away by the lubricating oil and carried away by cooling air (or water for water-cooled models) through the forced convection method in the oil cooler. In the air-cooled heat exchange process, the air side of the thermal resistance plays a dominant role, so it is necessary to keep the surface of the fins and tubes clean, if a large amount of oil and dirt (water-cooled units for scale) should be cleaned regularly.
14 Air-water separator The water in the compressed air is separated by the air-water separator, and then drained by the solenoid valve at the bottom of the air-water separator. When the drain solenoid valve needs to be serviced, the service ball valve should be closed and the manual drain ball valve should be opened moderately to ensure that not too much compressed air is wasted. The drain solenoid can then be removed for servicing. Temperature control valve The temperature control valve controls the minimum oil injection temperature of the compressor, because a low oil injection temperature will cause the exhaust temperature of the compressor to be low, and condensate will be analyzed in the oil-air separator, which will deteriorate the quality of the lubricating oil and shorten its service life. When the oil injection temperature is controlled above a certain temperature, the mixture of discharged air and lubricant is always above the dew point temperature. Its working principle is that the oil from the separator tank enters the temperature control valve, when the temperature is less than 70 ℃, the bypass port of the temperature control valve is fully open, and part of the hot oil is filtered to enter the host directly; when the temperature is more than 70 ℃, the temperature control element 5 extends, pushing the piston 2, and starts to close the bypass port gradually, and the amount of its closure is determined by the inlet oil temperature, and when the inlet oil temperature is higher, the bypass port is fully closed, and all of the oil enters the cooler to be cooled. Oil Filter The function of the oil filter is to filter out particles, dust and other impurities in the lubricating oil circulation process to ensure the normal operation of the compressor, and a differential pressure transmitter is installed on the upper part of its mounting, if the oil filter is blocked, the indicator light of the differential pressure transmitter is on, the oil filter should be replaced.
15 Operation Panel Description No. 1 2 3 4 5 6 Name Pressure gauge Pressure gauge NEZA PLC controller Button Button Function Display working pressure Display oil pressure Display machine status, fault and maintenance information Emergency stop Stop Stop Start No. 7 8 9 10 11 Name Button Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator Indicator NEZA PLC display The NEZA PLC display is used to show the relevant parameters and information of the compressor, and the buttons on it are used to set the system parameters or view the relevant information. 16 N E Z A P L C OPERATING INSTRUCTIONS Key Functions There are eight keys on the NEZA display***: ESC, ↑, ↓, →, ENTER, ▲, ▼, ALARM. ESC key: exit or clear ↑ key: number increase or move up item ↓ key: number decrease or move down item → key: cursor move left ENTER key: confirm key ▲ key: page up ▼ key: page down ALARM key: reset key Parameter Setting and Modification Parameter modification without password input Use ▲▼ key to find the page where the parameter is to be set, then there will be a quadrilateral at the modifiable parameter, then use ↑↓ key to change the quadrilateral. Then use ↑↓ key to move the quadrilateral to the parameter to be modified, press ENTER to confirm, at this time, there will be a cursor flashing in the place of the original parameter. Use ↑↓ key to input the desired parameter, use → key to move the cursor, the parameter is set, press ENTER to confirm, the setting is complete. Use ▲▼ keys to find the page where the parameter is located, there is a quadrilateral at the modifiable parameter, then use ↑↓ keys to move the quadrilateral to the parameter to be modified, press ENTER to confirm, at this time, a line will pop up, "Please enter the password", enter 1234 at this page, then press ENTER to confirm, at the original parameter, there will be a cursor flashing. Enter 1234 and press ENTER to confirm, the cursor will flash at the original parameter. Use ↑↓ key to input the desired parameter, use → key to move the cursor, the parameter setting is completed, ENTER to confirm, and press Setting is completed. The setting method is the same as above. Entering 1111 after the setting for machine-side control sets the compressor to machine-side control. Entering 2222 after setting for remote control sets the compressor to remote control. Pressure High Delay Shutdown Setting Pressure High Delay Shutdown Setting When Pressure High Delay Shutdown is turned on, the compressor will automatically shut down when the compressor discharge pressure reaches the upper pressure limit and does not drop below the lower pressure limit within the set time period, and will automatically start when the compressor discharge pressure drops below the lower pressure limit. Enter 1111 after 1111 is displayed to turn on the pressure high delayed shutdown function. Enter 2222 after 2222 is displayed for OFF to disable the high pressure delay stop function. 17 COMPRESSOR AIR CONTROL, SAFETY DEVICES AND ELECTRICAL PRINCIPLE CONTROL SYSTEM The control system automatically controls the compressor's discharge volume according to the compressed air consumption, and maintains the compressor in the predetermined range of maximum and minimum discharge pressures, depending on the compressed air pressure change to achieve automatic control. The system consists of pressure sensors, solenoid valves and load reducing valves. Once the compressor is started, the compressor is in no-load operation (the relief valve is closed), when the oil pressure rises to the pressure (0.2-0.3MPa) and the exhaust temperature reaches 50 ℃, the loading switch on the dashboard to the loading position, the compressor begins to suction work (the relief valve is in the full-open state) to separate the pressure in the tank rises gradually, when the working pressure is greater than the opening pressure set by the minimum pressure valve, the compressor starts to suction work (the relief valve is in the full-open state). When the operating pressure is greater than the opening pressure set by the minimum pressure valve, the compressor discharges compressed air and operates at full load. When the air consumption is less than the rated discharge volume, the system pressure rises. When the air consumption decreases and the compressor pressure reaches the upper limit value set by the system, the PLC outputs a signal, the solenoid valve on the relief valve is de-energized, the suction port of the relief valve is closed, and the compressor unloads. If the pressure drops to the lower limit value set by the system (the difference between the upper limit value and the lower limit value is adjustable, usually 0.05-0.15MPa), the solenoid valve on the relief valve is energized, and the suction port of the relief valve opens, and the compressor runs at full load. The safety valve is installed on the separator tank. In case of failure of the regulating system, when the exhaust pressure rises to the opening pressure of the safety valve, the gas will be injected into the atmosphere by opening the spool of the valve to make the pressure of the separator tank drop, and when the pressure drops to the closing pressure of the safety valve, the valve will be closed automatically. Generally, the opening pressure of safety valve is 0.15-0.2MPa higher than the rated pressure of the compressor. High temperature protection When the compressor discharge temperature exceeds the set value (115℃), the temperature sensing probe connected to the discharge orifice of the host computer will control the temperature electric contact action, automatically cut off the power supply of the motor, so that the compressor will be shut down in an emergency. When the water-cooled model is short of water or the water flow rate is too low, the water flow rate switch will be activated. If the water flow rate does not return to normal within 20 seconds and the exhaust temperature has risen to 110℃, the motor power will be cut off automatically and the compressor will be shut down. When the oil filter (essential oil separator) is clogged and the differential pressure reaches 0.1-0.15MPa, the differential pressure transmitter will be activated, and the controller screen will display a fault message, and the compressor will not shut down. When the air inlet filter is clogged, the differential pressure transmitter will be activated, the controller will display a fault message and the compressor will not shut down. The Y-△ starting method is adopted, and the electrical protection functions include: phase sequence protection (preventing compressor from reversing), phase failure protection, and motor thermal overload protection. 18 Compressor Installation 1. Before installation, check whether the packing box is intact and whether there is any damage to the compressor. After unpacking, the handling and installation of the unit should be carried out strictly according to the relevant handling precautions. There are two forklift holes under the base of the unit, and the wood should be put on the top of the unit when forklift is used to prevent the forklift from crushing the unit's door plate (see the figure). If slings are used, make sure to use crossbars, which can counteract the lateral pressure exerted by the slings on the box. Note: It is not advisable to put protective material between the sling and the acoustic enclosure of the unit, as this will damage the upper two door panels of the unit. The screw compressor should be placed on a level concrete floor capable of supporting its weight. 3. The screw compressor should be raised by 150mm (see below) to facilitate the connection of the inlet and outlet piping. 4、It is recommended that the air inlet and outlet of the acoustic enclosure should be 1.5m away, so that the cooling air can circulate freely, so that the cooled hot air can be fully discharged to the outdoors, and to avoid the possibility of repeated circulation of the cooling air too much. 5, piping, all pipes and fittings should meet the rated pressure, should minimize the use of elbows and various types of valves to reduce pressure loss. Piping diameter should be greater than the following rough calculation: d = 3.85 (L? V 1.85 / P? Δ P) 0.2 mm where: L - piping length m V - exhaust m3 / min P - working pressure (absolute pressure) MPa Δ P - allowable pressure loss (generally take 0.01 - pressure loss). Loss (generally take 0.01-0.02MPa) 19 6, for water-cooled units, cooling water supply pressure should be 0.2-0.6MPa, both import and export should be equipped with valves (see Figure), if there may be debris in the cooling water should be installed filters, 7, for air-cooled units, it is recommended that the installation of ducts will be cooled hot air out of the outside (see Figure), the exhaust pressure loss should not be too high. 7. For air-cooled units, it is recommended to install air ducts to direct the hot cooling air outside (see Fig.), and the pressure loss of the exhaust air should be not more than 6mm water column, otherwise, the extractor fan should be increased, and the air volume of the extractor fan should be not less than that specified in the following table. 8, such as the compressor and dryer supporting the use of the ideal piping system is installed between the compressor and dryer a storage tank, so that the compressor can be discharged gas cooling and separation of some of the condensate, while after the storage tank of the lower temperature and water content of the compressed air transported into the dryer, you can reduce the load on the dryer, energy saving. Schematic diagram of pipeline installation Schematic diagram of air-cooled unit installation 20 Preparation work before start-up 1. Check whether there is any looseness in the connection of each part, if there is any looseness, it must be tightened in order to avoid oil leakage, air leakage or other accidents at work. 2. 2、Check whether the measuring instruments are loose or damaged. 3、Connect the electrical appliances and ground according to the electrical schematic diagram. Check the wiring in the control cabinet to avoid the failure caused by loose wiring due to transportation. 4, check whether the compressor lubricant is enough, if not enough, should be added to the full, if more than the drain. Stop (or factory time) more than four months have not been used in the unit, you need to add 3 liters of lubricating oil to the air inlet of the host, to prevent the host no oil when starting. The oil added to the main engine should be absolutely clean and free of impurities. 5, clean up the unit near the unit and put on the unit of all unrelated objects. Compressor start 1, close the unit power supply switch (user-provided, and according to the total power of the machine to select the copper-core soft wire into the electronic control cabinet), the power indicator light, open the cooling water valve (water-cooled units). 2. Open the air discharge valve of the unit. 3, the newly installed compressor should check the direction of rotation, the method is to point the compressor motor (time should be as short as possible), carefully observe the direction of rotation of the motor is in line with the specified direction of rotation, if the direction of rotation is not right, please change the three-phase power line, two of the wiring position. If the direction of rotation is not correct, please change the position of two wires of the three-phase power supply line. 4, after the correct direction of rotation, and then start the compressor so that the motor reaches the rated speed, if there is any abnormal sound, immediately stop the machine, must be eliminated. 5、After the compressor enters into normal operation, the oil pressure gauge will be raised to 0.2-0.3 (MPa), and the compressor will run under this condition for 5-10 minutes, and the exhaust temperature will reach about 50℃, and then the loading switch on the instrument panel will be turned to the loading position, and the compressor will enter into normal operation. 1. After the compressor is in operation, pay attention to the oil level. If the oil level drops rapidly and the compressed air contains a large amount of oil, check and deal with the problem according to the troubleshooting table. 2、 Pay attention to whether the indicator reading of each instrument is within the normal range, and the air pressure should be within the rated pressure range. In the compressor suction temperature ≤ 40 ℃, the exhaust temperature should be ≤ 115 ℃. 3, when the oil fine separator and oil filter inlet and outlet pressure difference is too large, the controller screen display alarm, the compressor can still run, but should be stopped in time to replace the new parts, in order to avoid the lack of oil caused by the machine burned out of serious accidents. 4, when the exhaust temperature (or pressure) is too high, the controller screen shows an alarm, the host automatically stops, the display shows over-temperature (over-pressure) prompts, please find out the cause and deal with the fault before restarting. Compressor shutdown When the compressor needs to be shut down, press the shutdown button, the shutdown procedure will be completed automatically; or manual shutdown, first press the unloading button, the compressor is unloaded, and then press the shutdown button when the oil pressure drops to below 0.4MPa. After stopping the compressor, the bleeder holes in the load reducing valve and the bleeder solenoid valve on the oil separator should be deflated immediately, and the power supply switch should be pulled down after the deflation is completed. Close the cooling water valve (water-cooled units). The emergency stop button should be used only in case of emergency. Note: 1. After stopping the compressor, it is usually necessary to wait 2 to 5 minutes before pulling down the power supply switch to ensure that the compressed air in the tank is bled off through the bleeder solenoid valve, so that the next startup will be free of any load. 2. In winter, after stopping the compressor, the cooling water valve should be closed (water-cooled unit) and the cooling water in the oil cooler should be drained (see the figure below) to avoid icing and expanding of the oil cooler. 22 COMPRESSOR MAINTENANCE DRAINING CONDENSATE Moisture in the air may condense in the oil tank, especially in wet weather, when the exhaust temperature is below the pressure dew point of the air, or when the compressor is shut down for cooling, and more condensate may precipitate. Excessive water in the oil will cause emulsification of the lubricating oil, affecting the safe operation of the machine, such as: - causing poor lubrication of the compressor main unit; - deterioration of the oil separation effect, and increase in the pressure difference between the oil separator and the oil concentrate separator; - causing corrosion of the machine parts. Therefore, a condensate discharge schedule should be established according to the humidity conditions. Discharge of condensate should be carried out when the machine is stopped, when the machine is sufficiently cooled down and the condensate is sufficiently precipitated, e.g. in the morning before starting the machine. 1. Open the door and pull out the drain tube. 2. 2. Slowly loosen the screw plug to drain until oil flows out, then tighten the screw plug. Oil change must be done after shutdown and without internal pressure. Run the machine so that the exhaust temperature reaches 60-80℃ and the lubricant is fully preheated, then stop the machine and wait until the internal pressure is released. 2. Open the door and pull out the oil drain pipe. 3、Prepare the oil container, unscrew the screw plug to drain the oil. 4. For water-cooled unit, unscrew the oil drain screw plug at the bottom of the oil cooler and drain the oil in the oil cooler. 5. Screw on the screw plug. 6. Discharge the waste oil should be properly disposed of. Add new oil according to the following steps: 1, for water-cooled units, should be unscrewed from the oil cooler on the upper part of the refueling screw plug, the oil cooler is filled with oil. 2, open the oil tank on the refueling plug, the oil cooler should be filled with oil. 2, open the oil tank on the refueling port, the rest of the lubricating oil all added to the oil tank. 3. Screw on the screw plug, start the machine for 3-5 minutes to load, observe the oil level, the oil level should be in the middle of the oil level indicator. 4, fill in the replacement record 23 compressor oil replenishment In operation, the oil level of the compressor should be maintained between the lowest oil level and the highest oil level, more oil will affect the separation effect, less oil will affect the lubrication and cooling performance of the machine, in the oil change cycle, if the oil level is lower than the lowest oil level, should be timely replenishment of lubricating oil, the method is: 1, the machine released, pull down the main switch. Stop and wait for the pressure release 2, open the oil tank on the gas port, add the appropriate amount of lubricant to the oil tank. Compressor lubricant must use the correct compressor lubricant, and should be strictly in accordance with the requirements of the oil change, the poor quality of the compressor lubricant will produce the following consequences: - carbon or oil emulsification, blockage of the oil circuit, the valve action failure, which will cause the entire system paralyzed, the host burned. - Poor oil separation, shortening the service life of oil separator and oil filter. - The service life of the host moving parts will be shortened. Therefore, the lubricating oil of the compressor should be special screw compressor oil, add or replace the same manufacturer, the same brand of lubricating oil, different brands, different manufacturers of lubricating oil can not be mixed. Screw compressor oil must meet the following requirements: - high oxidation stability; - high temperature stability; - reduce the formation of sludge deposits; - reduce the tendency to foam, conducive to the separation; - have a high auto-ignition point and flash point, not easy to catch fire, flash point should be High auto-ignition point and flash point, not easy to catch fire, flash point should be more than 200 ℃; - pour point must be lower than the lowest ambient temperature of 5 ℃ or less; - good air separation, conducive to the separation, to reduce the oil content in the air; - good anti-corrosion properties; - long service life; - It must be a specialized screw compressor oil. 24 Replacement of oil filters The oil filters are located on the oil coolers, two per unit. The oil filters are located on the oil cooler and should be replaced every 2,500-3,000 hours or whenever the differential pressure sender alarm is activated (differential pressure of the filter is greater than 0.13 MPa). Replacement steps: 1, stop the machine and make sure the pressure has been released, pull down the power switch. 2, use the disassembling tool to disassemble the oil cooler in counterclockwise direction. 2. Use the disassembling tool to spin out the filter counterclockwise and pay attention to the residual oil overflow. 3. Check whether the new filter and its sealing ring are intact. 4. Tighten the filter clockwise by hand (no tools required). 5 、Check if it is normal after turning on the machine. The performance of the oil separator directly affects the oil content in the air. Oil fine separator is located in the separator tank, every 2500-3000 hours of operation, or as long as the differential pressure transmitter alarm (differential pressure greater than 0.1MPa) should be replaced in a timely manner, such as running time of less than 3,000 hours, at least once a year to replace the air or lubricating oil quality is not good, it will speed up the clogging of the oil fine separator, the differential pressure transmitter alarm in advance. Replacement steps: 1. Stop the machine and make sure that the pressure has been released, and pull down the main switch of the power supply. Remove the piping on the separator tank cover 2 and take out the pumping pipe. 2. Remove the separator tank cover bolts. 3. Turn bolt 1 clockwise so that cover 2 is lifted up a little. 4. Turn the cover plate. 5. Pull out the oil separator. 6. Replace the separator with a new one and install it in the reverse order. 7, fill in the replacement record 25 Replacement of air inlet filter Filter is generally replaced every 1500 hours of operation, or as long as the differential pressure transmitter alarm (differential pressure greater than 0.005MPa) should be replaced in a timely manner, during which time you can clean the surface of the filter element. When the air quality is not good, it will accelerate the clogging of the filter and the differential pressure transmitter will alarm in advance. Maintenance steps: 1. Stop the machine and make sure the pressure has been released, and pull down the power switch. 2. Unscrew the butterfly nut and remove the cover plate. Unscrew the compression nut and take out the filter element. 4、 Clean the filter element or replace it with a new one. Cleaning method: a) Knocking method to remove dirt: gently knock the upper and lower end surfaces of the filter element, that is, you can clean the dust and dirt on the filter element, pay attention to the strength of knocking to avoid damaging the filter element. b) Blow the filter element with dry compressed air. (b) Use dry compressed air to blow the surface of the filter element to remove dirt, but the compressed air pressure should not be greater than 0.4MPa. 5, clean up the dirt in the shell. 6, assembly in reverse order. 6. Assemble in reverse order. Note: Before assembling, check whether the sealing ring of the filter element is intact to ensure the sealing performance. 7, fill in the replacement record. Maintenance of one-way throttle valve The one-way throttle valve is used to recover the oil separated from the oil fine separator to the low-pressure end of the main unit, so that the oil fine separator will not be soaked with oil and affect the separating effect. When the oil is dirty, the one-way throttle valve is easy to be clogged, so it needs to be checked and cleaned regularly. Judgment method of clogging: feel the oil return pipe by hand, if the temperature is low, it means the oil return is low, and the one-way throttle valve may be clogged. Maintenance procedure: 1. Stop the machine and make sure the pressure has been released. 2. 2. Remove the oil return pipe and unscrew the valve assembly from the lower pipe nut. 3. Unscrew the connector, take out the spring and ball, unscrew the throttle body, and take out the screen. 4, use gasoline to clean the parts, and finally blow dry with compressed air. 5, check whether the seal ring is intact, and then installed in reverse order. 26 Safety Valve Maintenance The safety valve is installed on the separator tank and should be inspected once a year or according to the regulations of the local labor department. Stop the machine and make sure that the pressure has been released, and pull down the main switch of power supply. Unscrew the safety valve. 3. Check whether the operation is sensitive on the specialized test equipment. Adjustment is required, remove the seal, loosen the lock nut, then you can adjust the opening pressure by twisting the adjusting nut, clockwise twisting the adjusting nut is to increase the opening pressure, and vice versa. After adjustment, tighten the lock nut and seal. Install the safety valve back to the unit. Note: The opening pressure of the safety valve should be less than the design pressure of the oil filling. Motor bearing refueling Motor bearings should be guaranteed to have good lubrication during operation, when the operation reaches 5000h, should be supplemented or replaced with No.3 general lithium grease, if the bearing overheating or grease deterioration occurs during operation, the grease should be replaced in time, filling the grease accounts for 2/3 of the bearing chamber. motor oil injection ports are in the front and back of the end cover, you can use a grease gun to supplement the grease.