The two horizontal instrument air compressors of Zhongyuan Dahua Group Co., Ltd. selected the 2D3 5- 20/ 9 type oil-free lubricating air compressor produced by Shenyang Gas Compressor Factory. In-line symmetrical balance arrangement, the two-stage reciprocating compressor is driven by the YR400-10 three-phase winding asynchronous 135 kW motor, which completes the supply of all instrument regulating valve air supply during the stop of the device, and the protection device stops smoothly and starts driving. Performance parameters of the compressor.
Compressor various performance parameters Process parameters Equipment parameters Technical parameters mm Section inlet pressure MPa 0 1 Section outlet pressure MPa 0 3 Section 2 outlet pressure MPa 0 9 Section inlet temperature 30 Section 2 Exit temperature 170 Flow rate Nm 3 / h 1 000 Cooling water Consumption m 3 / h 18 Compressor motor section cylinder diameter mm 420 Radial clearance between the slider and the frame slide 0 145 0 248 Two-stage cylinder diameter mm 240 Radial clearance between the slider pin and the connecting rod small tile 0 06 0 103 shaft power kW 120 radial clearance between crankshaft pin and connecting rod block 0 07 0 132 stroke mm 180 outer stop clearance between piston and cylinder head 2 2 5 voltage V 380 between piston and cylinder block Inner dead center clearance 2 2 5 speed r/min 585 axial clearance between piston ring and ring groove 0 22 0 347 power kW 135 radial clearance between the sliding pin and bushing 0 03 0 073 2 compression Machine structure and performance
2. 1 transmission system
It consists of crankshaft, connecting rod and crosshead transmission components. It is easy to disassemble and assemble, easy to adjust the gap and easy to maintain.
2 .2 compression system
Composed of cylinder, piston and valve block compression components, the structure is simple, the space is used reasonably, the materials are selected properly, and the maintenance experience is mature.
2. 3 sealing system
In the one-stage and two-stage cylinders, there are three sets of sealing rings and one set of throttle rings; the sealing ring and the throttle ring are made of PTFE; cooling water flows from the outside of the sealed cavity to reduce the sealing element. Wear and tear.
2 .4 lubrication system
The crankshaft drives the gear oil pump to pressurize the lubricating oil to 0 25 M Pa, which is filtered and cooled and sent to each lubrication point. The oil pump is compact in design, reasonable in structure and easy to maintain.
2. 5 cooling system
Closed circulating cooling water, forced circulation cooling by the pump, reduces the temperature of the compression casing and compressed air, protects the sealing ring, and improves the efficiency of the compressor.
2. 6 security system
The manual control of the electric appliance and the automatic control system of the instrument, from the safety of the compressor itself, add 6 kinds of protection signals, and when the conditions are all met, the operation can be started to ensure that the compressor does not cause an accident.
3 Problems and improvements in operation
3. 1 cooling water sight glass
When driving in 1989, the mirror glass is made of plexiglass. During long-term operation, the temperature of the cooling water will gradually increase. In summer, it can reach 60. The mirror glass is deformed by the thermal expansion and cooling water pressure, and the glass is later affected by the glass. Turbidity affects the line of sight, and finally reaches the burst leak; while the mirror housing is cast from gray cast iron, when the mirror surface leaks, it does not dare to force tightly. If accidentally, the mirror gland cracks or breaks. , the amount of leakage will be greater.
In view of the above situation, we changed the plexiglass to quartz glass, which increased the cost, but also increased the strength of the glass, prolonged the service life of the glass mirror, reduced the number of times of glass replacement, and always kept the height of the mirror clear; The glass goggles are replaced by A3 steel plates to ensure their strength and toughness, reducing the leakage point of the sight glass. The reconstructed cooling water sight glass has no problems in operation.
3 .2 fuel tank electric heater
During the overhaul process, it was found that there was a large amount of carbon deposits on the oil pump filter, and the electric heater also had a thick layer of carbon deposit, the oil viscosity was lowered, and the lubrication effect of the sealing point was not good. The reason is that one of the starting conditions of the compressor is that the oil should be preheated to 20, and the technicians use the electric heater for a long time in the winter in order to prepare the machine. When the oil temperature is appropriate, the power can not be turned off in time, so that the surface of the electric heater first deposits carbon and reduces the oil. The viscosity, when there is more carbon on the heater, not only affects the heat transfer, but also the carbon will fall into the oil, be sucked by the oil pump, block the filter, and affect the supply of the lubricant.
In response to the above situation, we have added an oil temperature control switch to the electric heater. When the oil temperature is lower than 20, the electric heater is automatically used; when the oil temperature reaches 30, the electric heater is automatically disconnected. Through the use, it proves that our transformation is successful, which not only ensures the long-term backup of the compressor, but also ensures the oil viscosity and the lubrication point is well lubricated.
3. 3 Valve damage
During the trial operation after an overhaul, I heard an abnormal noise in the cylinder and the temperature at the end of the casing also increased. First, it was determined that there was foreign matter in the cylinder or the valve was damaged. The shutdown was found and the outlet valve group was The valve piece breaks and breaks, the broken valve piece is stuck at the end of the piston, and the piston indirectly collides with the housing.
Due to the timely discovery and accurate judgment, the accident has been avoided.
The cause of the accident was that the old and new combinations were used in the maintenance of the valve group. The old spring elasticity has slightly failed, and the new spring has normal spring force. During the suction and exhaust process, the valve plate is deflected and broken. In the future maintenance, we summed up the experience, the new and old springs are not mixed, and the valve with cracks is not used, ensuring the normal operation of the compressor.
4 Summary
Shenyang Gas Compressor Factory 2D3 5- 20/ 9 type oil-free lubricating air compressor, after 12 years of operation of Zhongyuan Dahua Group, the performance parameters are fully up to standard. Especially after two technical improvements, the instrument air compressor not only ensures the normal operation of the device when it stops, but also helps the process air compressor to do work in the summer. The continuous operation power is not reduced. The overhaul cycle is changed from 2 years to 4 years. The consumption of materials has been decreasing year by year.
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