The compressor unit is mainly composed of a body, an intermediate body, a cylinder, a crankshaft, a connecting rod, a crosshead, a piston assembly, packing and a gas valve.
1. The main body of the fuselage is cast iron on the upper part of each main bearing disassembly crankshaft and connecting rod, open. The main bearing near the motor end is the axial positioning bearing of the crankshaft, and the end of the bearing has a sealing device to prevent leakage of lubricating oil. The bearing is made of aluminum and covered with a thin strip of alloy. The main bearing bush is made of thin-walled bearing alloy. The crankcase cover can only be opened after 30 minutes in an emergency stop, and there is a danger of explosion if it is opened too early.
2. The intermediate body is a key component connecting the fuselage and the cylinder. It is cast and cast iron casting. There are large and small windows on both sides of the middle body, mainly for disassembling the packaging and adjusting the piston gap. Check that the piston rod parallels when the piston reciprocates. (That is, the eccentricity of the piston rod is 0.04mm, and the maximum does not exceed 0.07mm), and the scraping device is installed at the rear end of the chute. Its function is to keep the air in the crankcase from being confused with the nitrogen in the cylinder and the stuffing box. The lubricating oil in the crankcase can be recovered and recirculated. The upper part and the bottom of the middle body are provided with special holes, which can provide channels and interfaces for isolating the stuffing box through nitrogen protection, water cooling and nitrogen protection of the pressure stuffing box.
3. The surface of the cylinder is water-cooled and has an interior with a water jacket. When the cooling water is circulated, the heat generated in the compression process is partially taken away to improve the heating conditions of the cylinder block. The flow direction of the gas pipe in the cylinder is upward and downward, and the flow direction of the cooling water interface is downward and upward. The cylinder bore in the cylinder has a working surface, mirror-like and wear-resistant. Use a clean non-woven cylinder bore.
4. The crankshaft is an important part of the compressor. It is forged in one piece of high-quality carbon steel. There are two main journals and two curved necks in the crankcase. The two curved necks are 180 degrees to improve dynamic balance. The main journal and the curved neck have oblique oil holes, and the surface of the oil holes and journal is round and polished to improve the fatigue strength of the crankshaft. The lubricating oil is pressed out from the main shaft neck and reaches the crank neck through the main shaft oil hole. Then, press the connecting rod to the oil hole of the crosshead pin to ensure lubrication and cooling of the moving parts.
5. The connecting rod is the connecting part of the crosshead and the crankshaft. It is composed of the shaft body, connecting rod big end bearing and connecting rod small end bearing and connecting bolts. The shaft is forged from high-quality carbon steel with good mechanical properties. The rod nut is slotted and positioned to have a split pin. The connecting rod crank pin bearing is a two-piece shell type aluminum bearing that can be mounted on the crank pin. The toggle pin bearing connecting rod is a monolithic solid aluminum bushing that retracts into the eye of the connecting rod. The size of the connecting rod has a through oil hole, and the lubricating oil can directly pass along the oil hole to lubricate the large and small bearings and cool the large and small head bearings. If the running clearance is too large and the bearing noise is caused, it should be replaced in time.
6. The crosshead is a cast steel split structure. There are two aluminum bushes on the outside of the upper beam. The cross head is provided with sliding parts for easy installation and adjustment of the lower gasket. The crosshead and the piston rod transfer the connecting rod nut. Connect and use the internal toothed fixing cover to the loose lock (A03), (A08) and the pin bolt to prevent loosening. The bolt cross-head pin is made of carbonized steel and is connected to the transverse body by a tapered and tapered surface to be brought into close contact with the pin. The key on the tapered surface can be used to prevent the pin from rotating from the hole seat. The lubrication between the crosshead and the glide path of the middle body is realized by the oil eyes of the crosshead leading to the glide path of the middle body.
7. The piston assembly consists of a piston rod, piston body and piston ring. The piston rod is made of nitrided alloy steel, and the surface is nitrided to improve its wear resistance. The piston ring is an important and not easy to wear part of the compressor. Its function is to prevent gas from leaking from the high-pressure side of the cylinder to the low-pressure side. The materials, machining accuracy and assembly quality will directly affect the operation of the compressor. The piston ring of the hydrogen compressor on site is filled with PTFE + carbon-graphite material, which is suitable for high pressure and oil-free lubrication.
8. The package is a component that prevents gas from leaking between the piston rod and the cylinder in the cylinder. The quality of the piston rod seal directly affects the performance of the compressor. The basic requirements for packaging are good sealing performance and durability. The sealant at the front end of the field wiper and the pressure stuffing box is copper packing, while the back sealing packing and insulating packing are filled with Teflon + carbon-graphite. The slinger ring is the long-term wear of the slinger ring, causing oil to leak to the leakage edge of the piston rod. At this time, the oil baffle ring throws out the lubricating oil attached to the piston rod to protect the lubricating oil under the inertia of the reciprocating movement of the piston rod of the piston rod. Cleaning, at the same time, can also prevent lubricant from entering the cylinder and causing the cylinder to explode. When the compressor is not in use, open the nitrogen valve to fill the inside of the compressor with nitrogen, protect the piston rod and prevent rust inside the compressor.
9. The air valve is one of the most important components of the compressor. It consists of a valve seat, a valve plate and a valve spring and unloaded. The performance of the gas valve is directly related to the reliability and the efficiency of the compressor. The gas valve adopts a mesh valve in this equipment to avoid the following shortcomings: The guide part is very easy to wear and has no oil lubrication. When the unloading is not working, the intake valve is completely closed. When the compressor starts to work, at this time, under the effect of the unloading, the intake valve is forcibly opened to the specified 50%, 100% state. In order to make the outlet pressure reach the specified working pressure. When the intake valve stops, the intake valve opens to 100% position, so that the residual air in the cylinder is discharged to the cylinder passing the air valve, enters the intake buffer tank, and is discharged through the exhaust valve to make the piston in the cylinder . Pressure balance before and after.