50CYZ-60 centrifugal pump, diesel unloading pump

1. This pump is a self-priming centrifugal pump, which has the advantages of simple structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life and strong self-priming capacity. There is no need for a foot valve in the pipeline, and it is only necessary to ensure that a fixed amount of priming oil is stored in the pump body before work. When used on oil tankers or water transport ships, it can also be used as a tank stripping pump with good tank stripping effect.2. This pump is refined with high-quality materials, and the seal is made of alloy mechanical seal, which is durable. There is no need to install a safety valve on the discharge pipeline and no foot valve on the suction pipeline, which simplifies the pipeline system and improves the working conditions.

Working principle:

The CYZ series self-priming pumps all adopt an axial liquid return pump body structure. The pump body is composed of a suction chamber, a liquid storage chamber, a volute chamber, a liquid return hole, a gas-liquid separation chamber and other components. After the pump starts normally, the impeller sucks the liquid stored in the suction chamber and the air in the suction pipeline together, and completely mixes them in the impeller. Under the action of centrifugal force, the liquid carries the gas and flows to the outer edge of the volute chamber, forming a white foam belt with a certain thickness and a high-speed rotating liquid ring on the outer edge of the impeller. The gas-liquid mixture enters the gas-liquid separation chamber through the diffusion tube. At this time, as the flow rate suddenly drops, the lighter gas is separated from the mixed liquid, and the gas continues to rise and discharge through the discharge port of the pump body. The degassed liquid returns to the liquid storage chamber, and enters the impeller again through the return hole, and mixes again with the gas sucked from the suction pipeline inside the impeller, and flows to the outer edge of the impeller again under the action of the high-speed rotating impeller. As this process repeats continuously, the air in the suction pipeline is continuously reduced until the air is exhausted, the self-priming process is completed, and the pump will put into normal operation.

Because this pump has this unique exhaust capacity, it can transport liquids containing gas without installing a foot valve, and has a good tank stripping function when used on oil tankers.

A cooling chamber is also provided at the bottom of the bearing housing of some pumps. When the bearing temperature rise exceeds 70°C due to bearing heating, cooling liquid can be injected for circulating cooling through any one of the cooling liquid pipe joints outside the cooling chamber. The sealing mechanism inside the pump that prevents liquid from leaking from the high-pressure area to the low-pressure area is the front and rear sealing rings. The front sealing ring is installed on the pump body, and the rear sealing ring is installed on the bearing housing. When the sealing rings are worn to a certain extent after long-term operation of the pump, which affects the efficiency and self-priming performance of the pump, they should be replaced.

Pump operation:

1. The CYZ self-priming oil pump relies on an internal balancing mechanism to balance the axial force. The balancing device has balancing liquid flowing out, and the balancing liquid is connected to the suction section through a balance water pipe or a short pipe is installed outside the balance chamber, and the balancing liquid flows out of the pump through the short pipe. To ensure the normal operation of the pump, the balance water pipe must not be blocked;

2. All rolling bearings of CYZ self-priming pumps are not equipped with cooling devices. The change in bearing temperature rise reflects the assembly quality of the pump. The bearing temperature rise must not be higher than 35°C above the ambient temperature, and the temperature should not be higher than 75°C;

3. There is a certain axial movement of the rotor of the CYZ self-priming pump during operation, and the clearance between the end faces of the two couplings of the motor and the water pump should be ensured;

4. During the operation of the CYZ self-priming pump, the instrument, the pump speed and the wear of the impeller, sealing rings, guide vane sleeves, balance discs and shaft sleeves should be checked at regular intervals. If the wear is excessive, they should be replaced in time. In addition, monitor the pump flow, head, temperature and lubrication status; when the pump fails, stop the pump and refer to the troubleshooting list for maintenance.