Self-priming centrifugal oil pump, self-priming booster pump

1. This pump is a self-priming centrifugal pump, featuring advantages such as simple structure, convenient operation, stable operation, easy maintenance, high efficiency, long service life, and strong self-priming capability. It does not require a foot valve in the pipeline; only a fixed amount of priming liquid needs to be stored in the pump body before operation. When used on oil tankers or water transport vessels, it can also serve as a tank cleaning pump with excellent tank cleaning effect.2. This pump is precision-made from high-quality materials, with an alloy mechanical seal that is durable. No safety valve is needed in the discharge pipeline, and no foot valve is required in the suction pipeline, which simplifies the pipeline system and improves working conditions.

Working Principle:

All CYZ series self-priming pumps adopt an axially liquid-returning pump body structure. The pump body consists of a suction chamber, a liquid storage chamber, a volute chamber, a liquid return hole, a gas-liquid separation chamber, etc. After the pump starts normally, the impeller draws in the liquid stored in the suction chamber and the air in the suction pipeline, and they are fully mixed in the impeller. Under the action of centrifugal force, the liquid carrying gas flows toward 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 pipe. At this point, due to the sudden decrease in flow velocity, the lighter gas is separated from the mixed gas-liquid, and the gas continues to rise and discharge through the pump body's discharge port. The degassed liquid returns to the liquid storage chamber and enters the impeller again through the return hole, mixing with the gas sucked from the suction pipeline inside the impeller. Under the action of the high-speed rotating impeller, it flows toward the outer edge of the impeller again. As this process repeats continuously, the air in the suction pipeline decreases until the air is completely exhausted, completing the self-priming process, and the pump then operates normally.

Because this pump has this unique gas-exhausting capability, it can transport liquids containing gas without the need for a foot valve, and it has excellent tank cleaning function when used on oil tankers.

Some pumps also have a cooling chamber at the bottom of their bearing housing. When the bearing temperature rise exceeds 70°C due to bearing heat generation, coolant can be injected through any coolant pipe joint outside the cooling chamber for circulating cooling. The sealing mechanism that prevents liquid leakage from high-pressure to low-pressure areas inside the pump consists of 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 pump has been in operation for a long time and the sealing rings wear to a certain extent, affecting the pump's efficiency and self-priming performance, they should be replaced.

Pump Operation:

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

2. The rolling bearings of the CYZ type self-priming pump have no cooling device. The change in bearing temperature rise reflects the pump's assembly quality. The bearing temperature rise shall not exceed 35°C above the ambient temperature, and the temperature shall not be higher than 75°C;

3. The rotor of the CYZ type self-priming pump has a certain axial float during operation, and the clearance between the end faces of the two couplings of the motor and the water pump shall be ensured;

4. During the operation of the CYZ type self-priming pump, instruments, pump speed, and the wear conditions of the impeller, sealing ring, guide vane sleeve, balance disc, and shaft sleeve shall be inspected at regular intervals. If the wear is excessive, they shall be replaced in time. In addition, monitor the pump's flow rate, head, temperature, and lubrication condition; when the pump fails, it shall be stopped and repaired with reference to the fault troubleshooting table.