QZXD series vacuum pump maintenance instructions

I. Overview

QZXD series vacuum pump is a single-stage rotary oil seal pump. Its absolute working working pressure is 200Pa-8500Pa. It can withdraw the dry gas (such as the additional gas ballast can remove a certain amount of water vapor). Due to its convenient use, wide working pressure range, direct start at atmospheric pressure, long service life, it is the first choice of self-prepared vacuum pump for suction and suction trucks. In particular, the QZXDG type pump is a low-speed (400-500r/min), high-vacuum (above 99% vacuum), low-noise, low-energy vacuum pump and is an alternative to the 50QZXDF-98/8500.

QZXD series vacuum pump model and its meaning:

Second, the technical performance indicators

model	Rotating speed (r/min)	Absolute working pressure (vacuum)	Theoretical speed (L/s)	Shaft power (kw)	Applicable models
50QZXDF-98/8500	1,000	8500Pa (91.5%)	98	5.5	3-5 tons models
50QZXDH-45/7000	800	7000Pa (93%)	45	4	1-3 tons of models
50QZXDG-30/400	500	400Pa (99.6%)	30	3
50QZXDH-68/7000	800	7000Pa (93%)	68	5	More than 5 tons
50QZXDG-45/400	500	400Pa (99.6%)	45	4

Third, the structure

QZXD series rotary vane vacuum pump mainly consists of pump body, rotor and shaft assembly front and rear pump cover, rotary vane, slip ring, bearing cap and sealing device. The rotor turning center is eccentric to the center of the pump body, and the pump body is easy to dismantle and repair.

Fourth, the working principle

When the eccentric rotor rotates, the rotary vane slides against the inner wall of the pump under the action of centrifugal force, the volume of the suction chamber gradually increases, and the sucked gas is sucked into it until the rotary vane is turned to inhale and the suction gas is isolated. . As the rotor continues to rotate, the isolated gas is gradually compressed and the pressure is increased. When the pressure exceeds the pressure at the exhaust port, the gas is discharged outside the pump. In this way, the air in the container is evacuated and vacuumed.

V. Dismantling and repair

1. Unscrew the bearing cap 4 M8 bolts and remove the bearing cap.

2. Unscrew the eight M10 bolts on the pump cover at one end of the bearing cap, remove the bearing cap, and then remove the pump cap to withdraw the rotary vane (if you need to replace the rotary vane).

3. Unscrew the eight M10 bolts on the other pump end to pull out the rotor or shaft assembly.

Six, installation, maintenance requirements

1. Use a suitable shelf to solve the iron and hold the hoop to install the pump under the car girder. The pump's position level, left and right, and front and back are determined by the shaft axis of the power takeoff output shaft, and do not interfere with the components produced by the car beam. As close as possible to the power take-off and the girder. The connection inclination between the pump shaft and the power take-off output shaft must not exceed 7 degrees.

2. It is forbidden to leak the inlet pipe system, otherwise it will affect the degree of vacuum. The exhaust pipe should also be free from leakage to prevent the vacuum oil from escaping, polluting the environment and wasting energy.

3. Since this pump is an oil seal pump, it must have enough N32 mechanical oil when it is in normal rotation. No.32 refrigerating machine oil should be used in the cold winter season in the northeast and northwest regions. The engine oil should be sealed and lubricated, but the oil in the pump is also Because it will be pumped out of the pump when exhausted, it is necessary to install primary and secondary oil-gas separators on the outside of the exhaust port to fully separate the oil and gas. The oil is recovered and then used by the pump. The gas is discharged into the atmosphere and the pump runs smoothly. It is pollution-free and energy-saving.

QZXD vacuum pump suction system schematic:

note:

1. Pipelines are not allowed to leak, otherwise the suction truck will not work.

2. The vat must be fitted with spill-prevention devices. Otherwise, it is easy to use the faecal sewage into the vacuum pump to damage the entire system.

3. The connection between the oil return port of the primary oil and gas separator and the oil return port of the secondary oil and gas separator and the oil suction pipe must be made of rigid pipe or hard oil resistant rubber hose (steel wire braided hose). No heat deformable plastic tube is allowed.

4. When using the new pump, add 1-2 liters of No.32 mechanical oil directly to the pump and add No. 32 refrigerating machine oil when used in the cold regions of northeast and northwest.

A moisture separator should be installed at the suction port of the pump.

Our factory is equipped with primary and secondary oil and gas separators, four-way valves, water and gas separators with one-way valves, and spill-prevention devices for supporting use and independent pricing.