CYZ self-priming centrifugal oil 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 ability. There is no need for a bottom valve in the pipeline, and it is only necessary to ensure that a certain amount of priming oil is stored in the pump body before work. When used on oil tankers or water transport ships, it can also serve as a stripping pump with good stripping effect.2. This pump is refined from high-quality materials, and its seal is an alloy mechanical seal, which is durable. There is no need to install a safety valve in the discharge pipeline and a bottom valve in the suction pipeline, thus simplifying the pipeline system and improving working conditions.

Working principle:

CYZ series self-priming pumps all adopt a pump body structure with axial liquid return. 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 sucks the liquid stored in the suction chamber and the air in the suction pipeline together, 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 tube. At this time, due to the sudden decrease in flow rate, 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 exhausted, completing the self-priming process, and the pump then operates normally.

Because this pump has this unique gas discharge capability, it can transport liquids containing gas without the need for a bottom valve, and has a good stripping function when used on oil tankers.

Some pumps also have a cooling chamber at the bottom of the bearing body. When the temperature rise of the bearing 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 inside the pump that prevents liquid leakage 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 body. 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. CYZ type self-priming oil pump balances axial force through an internal balance mechanism. The balance device has balance liquid outflow, and the balance liquid is connected to the suction section through a balance pipe, or a short pipe is set outside the balance chamber, and the balance liquid flows out of the pump through the short pipe. To ensure the normal operation of the pump, the balance pipe is not allowed to be blocked;

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

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

4. During the operation of 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 status; when the pump fails, it shall be stopped and repaired with reference to the fault elimination table.