Instructions for Using Nitrogen Pressurizer

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Below are the operating instructions for the nitrogen pressure booster; those who need them can refer to them: I. Instructions for the compressor 1. Purpose The ZW-0.38/5.5-25 type lubrication-free nitrogen compressor produces clean compressed nitrogen since no oil is used in the cylinders, and it can be widely applied in industries such as machinery, chemicals, pharmaceuticals, gas protection, and food packaging. 2. The machine is equipped with a motor, and the XHS-15 low-voltage control cabinet is used for Y—△ starting. 3. Main structure and working principle: (1) Transmission mechanism: This mechanism consists of a motor, pulleys, a crankshaft, connecting rods, a crosshead, piston rods, and other components. The pulley connected to the motor drives the large pulley on the compressor, causing the crankshaft to rotate; this, in turn, enables the piston to move back and forth through the connecting rods, crossheads, and piston rods. (2) Compression mechanism: This mechanism consists of a cylinder, piston, combined intake and exhaust valves, as well as packing. The piston body is equipped with piston rings and guide rings. . The piston is at the outer dead center and begins to move toward the inner dead center; the volume of the space between the upper part of the piston, the cylinder, and the valves increases, causing the pressure inside the cylinder to drop. The intake valve opens (while the exhaust valve closes), and gas is drawn into the cylinder. When the piston reaches the inner dead center, the intake process is complete ； The piston moves from the inner dead center to the outer dead center, and compression begins. When the pressure inside the cylinder exceeds the pressure in the exhaust system, the exhaust valve opens (while the intake valve closes), and the compressed gas is expelled from the cylinder. When the piston reaches the outer dead center, exhaust is completed, completing one working cycle. For details, refer to the random factory assembly drawing and layout diagram (0216B.00, 0216B.000). (3) Lubrication of the transmission mechanism: No oil is used for lubrication inside the compressor cylinders; the piston rings and support rings employed have self-lubricating properties, as well as resistance to high temperatures and corrosion. The filler is made of filled polytetrafluoroethylene material. The lubrication of the motor is carried out in accordance with its instructions. The components that require lubrication in this machine are the crankshaft, bearings, connecting rods, and crossheads, all of which are moving parts within the transmission mechanism, and splash lubrication is used for this purpose. There is an oil sump at the bottom of the crankcase, and a slinger is mounted on the large end of each connecting rod. As the connecting rods rotate with the crankshaft, the slingers alternately dip into or out of the oil surface, splashing lubricant onto various moving parts to lubricate the friction areas. When lubricating oil splashes onto the piston rod, the oil-scraping device located on the upper part of the middle body, together with the oil-retaining ring on the piston rod, prevents the lubricating oil from entering the cylinder. Refer to the lower part of the body in the random factory assembly drawing (0216B.00). The filtered lubricating oil is poured into the oil sump through the breather on the crankcase. The amount of oil in the sump must be as indicated by the oil level gauge, and must not exceed or fall short of the specified level. The lubricating oil used is grade 30 oil in winter (equivalent to N46 under the new standards), and grade 40 oil in summer (equivalent to N68 under the new standards). The performance parameters of the lubricating oil shall meet the requirements specified in Table 1. Table 1: Serial Number, Item, Quality Specifications
30# 40#
1. Kinematic viscosity (50°C), mm2/s: 27–33, 37–43
2. Freezing point, °C: ≤-10, ≤-10
3. Residual carbon%, %: ≤0.25, ≤0.25
4. Ash content%, %: ≤0.007, ≤0.007
5. Water-soluble acids and bases: None, None
6. Acidity, KOH mg/g: ≤0.2, ≤0.35
7. Mechanical impurities%, %: ≤0.007, ≤0.007
8. Moisture: None, None
9. Flash point (open cup), °C: ≥180, ≥190
10. Corrosion (T3 copper sheet): Pass, Pass

(4) Cooling system (see cooling water pipeline diagram for details): The compressor cylinders are equipped with inlet and outlet ports for water at the top and bottom respectively; the water inlet is located at the bottom of the cylinder while the outlet is located at the top. Cooling water is introduced through the inlet pipe, flows around the cylinder walls and around the valve chamber, and then exits through the drain pipe. The cooling water for the aftercooler enters through the inlet and exits through the after-drain outlet. When in use, the main drain valve should be closed, and the individual valves should be opened and adjusted to control the total water inflow as well as the distribution of water to each circuit. After stopping the machine, all the cooling water must be drained to prevent freezing and damage to the unit in winter; by closing the main inlet valve and opening the main outlet valve, the cooling water in all compartments of the system can be drained. The cooling water piping is to be installed by the user according to the cooling water piping diagram (0216B.060). The unit requires water cut-off protection, and target flow meters are provided; other pipe fittings are to be supplied by the user. The cooling system must operate properly while the unit is in use. If water supply is interrupted due to a fault, the compressor should be stopped immediately, and water supply and operation can resume only after the temperature of the unit, especially the cylinders, has dropped. Introducing cooling water into the machine when it is at high temperature can cause cracks and damage to its components. The cooling water pressure is generally in the range of 0.1 to 0.3 MPa, while the drainage temperature is usually between 21 and 38°C, with a maximum of 45°C℃ ； The temperature difference between inlet and outlet water is around 10°C; if the temperature difference is…