The screw air compressor is a volumetric compressor that adjusts the rotation. The gas is compressed by the working volume reduction. There are no moving parts other than the two screw rotors that adjust the rotation, and there is a rotary compressor (such as a centrifugal compressor). ) and the advantages of reciprocating compressors (such as piston compressors), such as small size, light weight, smooth operation, less wearing parts, high efficiency, large single-stage pressure ratio, energy stepless adjustment, etc. The industry has been rapidly developed and applied. Its basic structure is as follows.
Fully enclosed screw compressor structure exhaust orifice; 2 built-in motor; 3 suction shut-off valve; suction port; 5 suction check valve; 6* suction filter; 7* filter; 8* gas volume Adjust oil piston; one adjustment slide valve; 10* yin and yang rotor; 11* main bearing; 12* oil separator; 13* oil slab.
2 Failure phenomenon analysis and treatment A Fusheng SA37A twin-screw air compressor has high exhaust gas temperature and trips by itself, and the exhaust high temperature indicator light is on (more than the set value 100*C).
2.1 Screw air compressor cooling system At the extreme ambient temperature, the main engine exhaust temperature is 10 overcooling system to take away 80% of the compressor heat, while at the same time to lubricate the rotor and bearings, seal the rotor, improve the efficiency of the compressor. After cooling, the final exhaust temperature is lower than 100, higher than 70C. The cooling system consists of a cooling circuit, a temperature control valve, a filter, a fuel cut solenoid valve, a check valve, etc., such as a cooling circuit. 2.2 Failure Analysis and Treatment Analysis The causes of this failure are: (1) incorrect lubricant specifications; 2) insufficient lubricant; 3) high ambient temperature; 4) thermal control valve failure; (5) air filter Not clean; 6) oil filter clogged; (7) cooling fan failure; several possibilities. Only 4 or 8 are left, so the two are excluded one by one.
First of all, to confirm whether the machine temperature measuring component is faulty, use the temperature measuring instrument to proofread, and find that the temperature measuring component has no problem. Then check the temperature difference between the oil cooler inlet and outlet, whether it is between 5-8C. As a result, it was found that the detected temperature was larger than this range, indicating that the oil flow was insufficient, the oil passage was clogged, or the thermal control valve was not fully opened.
Since the oil filter has been checked, it is denied that the oil circuit is clogged, so check whether the thermal control valve is normal. Take out the valve sleeve inside the heat control valve, soak it in the boiling water of about 100C, and find that the valve core extends about 10mm, indicating that the inside of the valve core is normal. Carefully found that there are many scratches on the outside of the outer part of the thermal control valve sleeve, which may be caused by acrobatics in the oil circuit. These scratches cause the thermal control valve sleeve to have resistance during the telescopic process, and the spring cannot completely top it. On, the oil cannot be cooled by the oil cooler. Replace the thermal control valve and the device returns to normal.
3 Other common faults and treatments of screw air compressors 3.1 The compressor can not be started normally or the normal operation and maintenance measures are mainly carried out: whether the rotating motor is flexible after the power is cut off; check that the input power supply voltage cannot be lower than the rated value by 10%, and three Phase current imbalance error <5%; check the contact condition of the three-phase power supply air switch connection, whether there is phase loss; check the safety relay, time breaker, AC contactor contact failure; check the relief valve failure, whether the shutdown is not strict or card Death, causing the starting air intake to be the most excessive, causing an overload trip; checking whether the water pressure of the waterway is low, the water pressure protection can not be activated.
3.2 The working pressure of the unit can not be set up to check the failure of the unloading valve, whether it is stuck or not; the control solenoid valve on the salty valve is faulty or damaged; check the failure of the loading switch, whether the electromagnetic loss on the unloading valve causes the unloading valve Failure to open; checking the proportional control valve on the unloading valve: The main failure causes and countermeasures of the modern commercial industrial drum type flying shears Huang Wenfeng Zhao Gangjun (Anyang Iron and Steel Co., Ltd., Anyang 455000, China) 1 Failure causes and countermeasures of the cutting edge locking mechanism 1.1 The structure of the cutting edge locking and the faulty cutting edge assembly are locked on the cutting drum by 15 sets of cutting edge locking devices. The cutting edge locking device is composed of a cylinder tube, a knife seat, a cutting edge assembly, a locking wedge, a connecting plate, a support, a disc spring group, a cylinder rod and a safety valve. The cutting edge assembly is composed of a cutting edge, a lower gasket group, a side gasket group and the like. When replacing the cutting edge, use the pneumatic oil pump to inject the pressure oil into the lower part of the cylinder rod, so that the cylinder rod compresses the disc spring group and moves upwards, and the locking wedge is opened by the top plate to loosen the cutting edge assembly. After the old cutting edge assembly is assembled and the new cutting edge assembly is assembled, the pressure pump is released, and the cylinder rod moves downward under the action of the disc spring group, and the locking oblique block is pulled down through the connecting plate, and the inclined surface is pressed against the shearing On the side of the blade, the purpose of locking is achieved. The safety valve acts to protect the lock cylinder seal.
Under the cutting edge, the shim drum locks the wedge-safety valve cutting edge structure. 2 The main faults and causes of the cutting edge locking device During the use, the cutting edge locking device has the lower cutting edge falling off, the connecting bolt between the side gasket and the cutting edge is broken, and the gasket is pulled out, resulting in the cutting edge. Unable to lock. There are two main reasons for the failure of the lower cutting edge: First, the drum type flying shear is related to the stress during the cutting process and the shearing process. The shearing process of the flying shear is generally: when entering the flying shear to start the cutting pass, the cutting edge first reaches the starting position 1 and waits for the cutting command. When the cutting point is set, the drum starts to accelerate to the position f2, and then the uniform speed Run, cutting is completed from the shear angle f3 to the position f4.
In order to reduce the impact of the steel plate on the transport roller during shearing, the shear line design of the flying shear is higher than that of the transport roller. When the cutting edge of the flying shear is operated to the f6 position, it will contact the lower surface of the steel plate and start to cut. The segmented steel plate is lifted off the roller table. Due to the difference in speed, the lower cutting edge has a certain sliding relative to the steel plate before entering the shearing. The cutting edge is subjected to the gravity and friction of the steel plate. Meanwhile, in the shearing process, the flying shear is removed. In addition to the shearing force required for shear deformation, there are lateral pressure, tensile force and dynamic load in the horizontal direction, in order to prevent the cutting edge from hindering the steel plate during the shearing process or subjecting the steel plate to excessive tensile stress and To reduce the impact load of the flying shear, it is generally set at the shear angle f3. The instantaneous partial velocity Vx of the flying shear cutting edge in the moving direction of the steel plate is equal to or slightly larger than the moving speed V0 of the steel plate, and whether the upper limit value of the Vx or the pressure switch is accurate. The load-reducing valve is closed; check the tension of the transmission belt, whether it is too loose, the main engine speed is insufficient, and the air supply is reduced; check the air filter for blockage; check whether the air consumption exceeds the rated discharge capacity of the main engine or the pipe. Net leakage condition; check whether the pressure return pipe is loose or leaking; check the minimum pressure valve failure, stuck, and air leakage.
3.3 The unit pressure is high, the shutdown is stopped, or the safety valve is opened. The venting maintenance measures are mainly carried out: check whether the upper limit of the pressure switch exceeds the rated working pressure; check whether the oil separator filter is clogged; check whether there is a loss of the relief valve or the solenoid valve is out of control. Causes the shutdown to fail and the unloading is out of control.
3.4 After the shutdown, the lubricating oil overflows from the suction port. Inspection and repair measures are to check whether the replacement of the relief valve seal is invalid or the return spring is broken. The second is to check whether the compressor main engine oil shutoff valve is broken or the spring is broken.
3.5 The fuel consumption of the unit is too large. The fuel consumption of the unit is too large: the condensate discharged from the unit water separator is milky white (that is, the oil content of the exhaust gas is too high). Maintenance measures must be carried out: check whether the amount of lubricating oil is suitable, and excessive filling is not conducive to the load of the separation and weighting filter element; check the filter return line, such as the one-way valve is blocked, causing oil return failure; check the separation filter If the fine separation filter is not installed correctly or the core is damaged, the oil separation is invalid; check the quality of the lubricant, the oil is different, and the separation effect of the non-special oil is poor.
3.6 The operating unit exhaust gas is less than 70 degrees. The treatment measures are: when the exhaust gas temperature is low, the water cooling type can reduce the cooling water flow; the temperature control valve failure can increase the elastic force by adding the gasket to the temperature control valve spool spring. Salty and no-load time.
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Grade : Incoloy 800 (UNS N08800), Incoloy 800H/HT (UNS N08810), Incoloy 825 (UNS N08825)
Standard : ASTM A564 / ASME SA564
Dimensions : ANSI/ASME B16.5, B 16.47 Series A & B, EN-1092, BS4504, BS 10, B16.48, DIN, etc.
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