At the exhaust end, since the exhaust port is disposed in a small space, the continuous meshing of the two helical teeth gradually reduces the volume of the cavity between the teeth before the communication with the exhaust port, thereby achieving the purpose of compressing the gas. The process of gas compression is completed. Finally, the interdental cavity communicates with the exhaust port, and the compressed gas is discharged from the body to complete a working cycle. From the mainframe structure and working mechanism of the screw air compressor, it is easy to see that it has fewer moving parts, only the oil film exists between the rotors that mesh with each other, and there is no piston mechanism and complex similar to the reciprocating motion of the piston machine. Inlet and outlet valve mechanism, so it has little wear, more reliable operation and long life. Secondly, the main machine operates like a turbomachine, there is no unbalanced inertial force, and the gas compression is continuous, no impact, the machine can work smoothly at high speed, and no special equipment foundation is needed. In addition, the system of the screw machine 2 screw air compressor system constitutes the system design of the screw air compressor machine is very simple and reasonable, 21 can be divided into a part of the air flow air suction filter, through the intake valve into the compression In the main engine, after being compressed into the oil separator, the oil in the compressed air is removed, and then discharged to the exhaust pipe through the minimum pressure valve air cooler. The fuel system air pressure pushes the oil out of the oil separator, flows through the oil cooler and the oil filter, and finally reaches the compressor main unit and its lubrication point. A bypass valve is mounted on the fuel injection system. When the oil temperature is lower than 4, the oil enters the body directly without passing through the cooler. When the oil temperature exceeds 55, the valve closes to allow all of the oil to cool through the oil cooler before entering the mainframe. Cooling system and condensate drain system The cooling system consists of an air cooler and an oil cooler, which are cooled by a fan on the motor. Xiao set 7 orders + a few 2, and then discharged the machine. The refrigeration system works like an air conditioner. A gas water separator is also installed before the compressed air discharge port, and the separator is equipped with an automatic drain valve and a manual drain valve to automatically discharge the condensed water during the compressor operation or manually discharge the condensed water after the compressor is stopped. 1 information index cooler 2 cents 鸹 ç’ æ² å· å· 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 4 . It is a computer controller and its control panel as the control center, with the compressor main unit outlet temperature sensor 5 and the whole machine air supply port program, the output electric signal triggers the conventional electric control element to realize the control of the compressor. The main function realized by it is to control the operation of the compressor; this function mainly includes controlling the star-shaped step-down start of the main motor; using the solenoid valve to control the compressor to automatically load and unload within the set range; to minimize the power consumption, when the gas network When the air consumption is small, it automatically stops the compressor and restarts automatically at the appropriate time. Protect the compressor; detect the temperature of the compressor main engine outlet in real time. If the temperature exceeds the set value, the compressor will stop and appear on the control panel. When the compressor main motor is overloaded, the compressor will also stop alarming. Monitor the working condition of the wearing parts; set the oil filter separator air filter replacement cycle, when the set value is exceeded, the relevant information will be displayed on the control panel to warn the operator to replace the displayed parts. ......4. Remote control function By changing the code of the control status selector, the remote control function can be realized, including only the remote control on and off, loading and unloading, and outputting the running status and fault alarm signal to the outside world. 4 Maintenance and maintenance The machine has the function of automatic monitoring, and its maintenance work is relatively simple. Through two years of practice, we summarize the main routine maintenance work of the screw air compressor as the following points to check the information on the display screen every day, check the loading and unloading time interval of the machine, the exit temperature, noise and whether there are other mentions; The cooler is purged every other week; the oil-air filter oil filter is replaced every 4000 hours; the oil separator is replaced every 8,000 hours of operation. Under normal maintenance and maintenance, the machine rarely fails. In the past two years of use, we have encountered a total of downtime. This downtime has a certain generation. Through this maintenance experience, we have made an understanding of the running performance of the machine. At 1 o'clock, we have a deeper understanding of the importance of 1 maintenance. . The maintenance example machine screen causes the compressor head outlet temperature to exceed the set value, causing automatic shutdown. According to our usual observations, the working temperature of the machine under normal conditions is below 80. We first ruled out the possibility that the oil cooler is not well cooled and the temperature rise is too fast. Through the observation of the relevant parameters of the display screen, it is found that the temperature rise range is normal when the host is loaded, and the temperature rises sharply after the short-term cooling step when unloading, and notices that the oil cooler emits cold air when unloading, which indicates that the oil is in the oil. The cooler was not entered when unloading. We judge that the fault is most likely caused by the oil circuit + smooth. First of all, we put the suspicion on the bypass of the oil circuit. The flashing bypass valve is the only switch that switches the bypass into the oil cooler. Under the guidance of the manufacturer, we will disassemble the bypass valve and exchange the spring and the spool position, so that the bypass valve is in the long open state, that is, regardless of whether the oil temperature exceeds 40, the oil must be cooled by the oil cooler. Enter the host. A small new machine, the result of the failure still exists. We had to check the devices of Kushiro. After the reverse search, the most important one was to focus on the oil filter. For this reason, we replaced a new oil filter. After the startup, the fault was eliminated. . In fact, the cause of the fault is that part of the dirt in the air is brought into the oil, and then circulated into the oil filter through the oil passage, causing a large resistance to oil filtration. The movement power of the oil comes from the air pressure of the oil separator. When loading, due to the large air pressure, the oil can overcome the oil resistance in the filter and reach the host. Therefore, the temperature rise range of the main engine is relatively normal when loading. However, when unloading, because the air pressure is small, the oil can't overcome the resistance and can't reach the host, and naturally it can't cool down. It was only because the oil cooler had not reached the replacement cycle, so it was not suspected at first. 1 maintenance example 21 = machine due to excessive pressure caused by 0 stop. We started the machine and found that the machine only loaded and unloaded, so that the pressure in the helium separator was too high to start the safety valve and the system detected that the pressure exceeded the set value and stopped automatically. Through the analysis of the loading and unloading control process of the machine 2, we found that the main mechanism is to control the pressure of the solenoid valve to push the compressed gas into the piston chamber of 1 or to open the body by opening 1 The gas is discharged from the upper end of the hole 1 so that the machine is in a loaded or unloaded state. To do this, we first check the contacts of the relay that screwes the solenoid valve to see if the solenoid valve is always energized due to the contact sticking. After eliminating this possibility, we will remove the electromagnetic shock and find that the internal small spring cannot be recovered due to the serious dirt, so that the core can not move downwards, so that the small machine only loads and does not unload. Reassemble the solenoid valve after cleaning, and check for troubleshooting. Shortly after the maintenance example 32 was turned on, the safety valve was operated, and the pressure was normal at this time. We first ruled out the safety valve. Then the minimum pressure valve was inspected, and it was suspected that the opening pressure was too large, causing the internal pressure of the oil separator to be too large. However, the result of the inspection of the apricot was not abnormal, and it was finally determined that the filter element of the helium separator was blocked and caused to compress through the filter element. The gas pressure loss is too large, and the external pressure and the internal pressure pressure difference are large. Therefore, when the safety valve communicating with the internal pressure acts, the pressure sensor 6 communicating with the external pressure still exhibits a normal value. Replace the filter element of the oil separator and eliminate the fault. Through the above maintenance examples, we can see that this kind of failure has a great relationship with the operating environment of the air compressor. Therefore, keeping the working environment of the air compressor clean, regular inspection and replacement of the air filter oil and oil filter is very important to ensure the normal operation of the air compressor. 5 Fault judgment and treatment 5.1 Solenoid valve failure The empty machine is in operation 1, such as the normal sweat normally closed electromagnetic valve due to aging, the valve core fails or the electromagnetic line fails. The electromagnetic will not open or close, causing the unloading valve to fail to open and the system has no air supply. The cause of the failure of the solenoid valve is the fouling of the spool or the failure of the solenoid. If the scale is cleaned, if the coil is burnt, replace the solenoid valve in time to ensure that the initial pressure can be established and the unloading valve is opened to ensure the air supply. 5.2 In the case of faulty operation of the minimum pressure valve, the dissolved gas may be ineffective. Sometimes the fault occurs on the minimum pressure valve. When the pressure controlled by the minimum pressure valve is 1 014, the pressure valve opens. When the minimum pressure is due to the spool If the seal is not tight or the spring fails, the gas supply will not reach the rated value, and the pressurized gas is not effective. To solve the problem of 1 small force, when the valve core or the valve seat is not tightly sealed, it needs to be repaired to replace the valve core or the valve seat. When the spring fails, adjust or replace the spring to ensure that the supply pressure is constant. 5.3 Oil and gas separation filter failure When the helium separation filter is on both sides of the old screen too large column. 〃 or too small, 2, when the filter element + to filter separation, the lubricating oil is not well separated at the filter element. The oil and gas mixture passes through the minimum pressure valve and enters the subsequent system. The lubricating oil runs out too quickly, and a large amount of lubricating enthalpy is brought into the gas path. The enthalpy 1 in the dissolved water increases, resulting in an increase of 1 effluent oil. At this time, the spring 瞧, 肼诵æªæ¹ 肼诵æªæ¹ 饩, this asked. 5.4 Injecting the throttle orifice to block the fuel injection throttle plugging is the reason for the oil in the dissolved gas. Due to the long-term continuous operation of the air compressor, the impurities in the oil and air accumulate for a long time, so that the impurities or fibrous substances in the fuel injection pipeline increase, so that the throttle hole of the injection circuit is easy to be blocked. Make the fuel injection circuit not smooth. The oil level of the gas storage tank is gradually increased, and the oil passively brings out the minimum pressure valve, and the gas is rich in oil. At this time, the orifice and the fuel injection pipe should be cleaned. 5.5 The return pipe orifice is blocked by the orifice of the return pipe, which is the main way for the air compressor to run out too quickly. After the oil and gas mixture is separated by cyclone in the gas storage tank, most of the lubricating oil has settled into the bottom of the gas storage tank due to cyclone separation and gravity factors, and some of the oil filtered by the oil separator filter element has flowed down to the bottom of the filter element to gather. If the return pipe is unblocked, the oil is completely returned to the oil groove at the bottom of the compressor for relubrication. However, if the orifice in the return pipe is clogged, the lubricating oil settled to the bottom of the filter element cannot be returned to the air compressor oil groove, so that the oil in the bottom of the filter oil 5.6 changes the oil in the gas to increase the lubrication of the screw compressor used in the system. The oil is air compressor oil. It is required that the lubricating oil should contain anti-rust, anti-oxidation, anti-foam and anti-corrosion ingredients. If the lubricating oil quality does not meet the above requirements, the lubricating oil is easy to oxidize, and the foam is too foamy. In the operation, the oil is oxidized or the foam is too much. The lubricating oil that generates the foam is easily passed through the minimum pressure valve, and the lubricating oil runs out too quickly. . In this case, replace the required lubrication 汕. 6 Conclusion Because screw compressors have more advantages than other types of compressors. The machine has good safety, high reliability, and constant running air volume pressure, which is suitable for operation under various conditions. From the above analysis of the impact of frequent faults on gas, there are many solutions, and the maintenance workload is small, the operating cost is low, the labor intensity is small, and it is easy to grasp.
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