CYZ type horizontal explosion-proof self-priming centrifugal oil pump

The CYZ horizontal explosion-proof self-priming centrifugal oil pump is the latest product developed through digestion, absorption, and improvement based on relevant technical data at home and abroadoil pumpThe ideal product for the petroleum industry, land oil depots, and tank trucks, and suitable for use as ship cargo oil pumps, bilge pumps, ballast pumps, and machine cooling water circulation. It can transport petroleum products such as gasoline, kerosene, diesel, aviation kerosene, as well as seawater and clean water, with a medium temperature of -20 ℃ -80 ℃. If corrosion-resistant mechanical seals and stainless steel materials are used, it can also be applied to chemical, pharmaceutical, brewing, electroplating, printing and dyeing, papermaking, power mining, etc. It is an efficient and energy-saving oil pump.

CYZ type horizontal explosion-proof self-priming centrifugal oil pump model meaning:

Structural diagram and working principle of CYZ horizontal explosion-proof self-priming centrifugal oil pump:

1. Coupling, 2. Pump shaft, 3. Bearings, 4. Mechanical seal, 5. Bearing body, 6. Pump casing, 7. Outlet seat, 8. Inlet seat, 9. Front sealing ring, 10. Impeller, 11. Rear cover, 12. Water stop ring, 13. Liquid inlet hole, 14. Liquid return hole

Structure working principle:

The CYZ type horizontal self-priming centrifugal oil pump adopts an axial return liquid pump body structure. The pump body is composed of a suction chamber, a liquid storage chamber, a scroll chamber, a liquid return hole, a gas-liquid separation chamber, etc. After the pump starts normally, the impeller sucks the liquid in the suction chamber and the air in the suction pipeline together, and is completely mixed in the impeller. Under the effect of centrifugal force, the liquid carries the gas to the outer edge of the scroll 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 a diffusion tube. At this point, due to the sudden decrease in flow rate, lighter gases are separated from the mixed gas-liquid mixture, and the gases continue to rise and be discharged through the pump outlet. The degassed liquid returns to the storage chamber and enters the impeller again through the reflux hole, where it mixes with the gas sucked in from the suction pipeline inside the impeller. Under the action of the high-speed rotating impeller, it flows towards the outer edge of the impeller. As this process repeats itself, the amount of air sucked into the pipeline decreases continuously until all gas is sucked out, completing the self-priming process, and the pump is put into normal operation. Due to its unique exhaust capability, this pump is able to transport liquids containing gases without the need for bottom valves, and has excellent cleaning function when used on oil tankers.

Some pumps also have cooling chambers at the bottom of their bearing bodies. When the bearing heats up and causes the temperature of the bearing to rise above 70 ℃, any coolant pipe joint can be used at the cooling chamber Inject coolant for circulating cooling. The sealing mechanism inside the pump to prevent 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 sealing ring wears out to a certain extent after long-term operation of the pump and affects the efficiency and self-priming performance of the pump, it should be replaced.

　　Product Features:

1. CYZ explosion-proof self-priming pump belongs to self-priming centrifugal pump, which has the advantages of simple structure, easy 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. Before operation, it is only necessary to ensure that a certain amount of oil is stored in the pump body. When used on oil tankers or water transport vessels, it can also serve as a cleaning pump with good cleaning effect.

The CYZ explosion-proof self-priming pump is made of high-quality materials and sealed with hard alloy mechanical seals, which are durable and long-lasting. The discharge pipeline does not require the installation of a safety valve, and the suction pipeline does not require the installation of a bottom valve, thus simplifying the pipeline system and improving working conditions.

The use and application of CYZ type horizontal explosion-proof self-priming centrifugal oil pumpDisassembly and maintenance

（1） Preparation and inspection work before starting:

1. This series of oil pumps uses high-quality calcium based butter No. 10 engine oil for lubrication according to the working and operating conditions of the pump. If a grease lubricated pump is used, butter should be regularly added to the bearing box. If a grease lubricated pump is used, the oil level should be sufficient.

2. Check if the liquid storage inside the pump casing is higher than the upper edge of the impeller. If it is insufficient, the liquid can be directly injected into the pump body from the filling port on the pump casing. The pump should not be started and operated when the liquid storage is insufficient, otherwise the pump cannot work normally and the mechanical seal may be damaged.

3. Check if the rotating parts of the pump are stuck or bumped.

4. Check for loose nuts at the pump body feet and connections.

5. Check the coaxiality or parallelism between the pump shaft and the motor shaft.

6. Check if there is any air leakage in the inlet pipeline. If there is any air leakage, it must be eliminated.

7. Open the valve of the suction pipeline and slightly open it Do not fully open the outlet control valve.

（2） Starting and operation:

1. Start the oil pump and pay attention to whether the direction of the pump shaft is correct.

2. Pay attention to any abnormal sounds and vibrations during rotation.

3. Pay attention to the readings of the pressure gauge and vacuum gauge. After starting, when the readings of the pressure gauge and vacuum gauge fluctuate for a period of time and stabilize, it indicates that the pump has been filled with liquid and the oil pump is operating normally.

4. During the self suction (or tank cleaning) process before the normal oil delivery operation of the pump, special attention should be paid to the idle condition of the oil temperature rising inside the pump. If this process is too long and the oil temperature inside the pump is too high, the pump should be stopped to check the cause.

5. If the temperature of the liquid inside the pump is too high and causes difficulty in self-priming, it can be temporarily stopped. The liquid in the discharge pipeline can be used to flow back into the pump or to directly replenish the liquid into the pump through the storage port on the pump body, so as to cool down the liquid inside the pump, and then start it.

6. Adjust the outlet control valve to make the pressure gauge reading point to the specified area, avoiding the oil pump from working within the lower limit range of the specified area, to prevent motor overload caused by excessive shaft power, or cavitation caused by excessive flow, affecting the normal operation of the pump, causing strong vibration and noise.

7. If there is strong vibration and noise during the operation of the pump, it may be caused by cavitation. There are two reasons for cavitation: one is that the inlet pipe flow rate is too high, and the other is that the suction stroke is too high. When the flow rate is too high, the outlet control valve can be adjusted to increase the pressure gauge reading in the inlet pipeline

When there is a blockage, it should be promptly eliminated; When the suction distance is too high, the installation height of the pump can be appropriately reduced.

When the pump stops for some reason during operation and needs to be restarted, the outlet control valve should be slightly opened (not fully closed), which is beneficial for the gas to be discharged from the outlet during the self-priming process and can ensure that the pump starts under lighter loads.

9. Pay attention to checking whether there is any leakage in the pipeline system.

（3） Stop the pump:

Firstly, the gate valve on the discharge pipeline must be closed.

2. Stop the pump from rotating.

During the cold season, the liquid stored in the pump body and the water in the cooling chamber of the bearing body should be emptied to prevent freezing and cracking of the components.

Disassembly and maintenance:

The characteristic of this pump is its simple and reliable structure, as well as its durability. Under normal circumstances, the pump generally does not require frequent disassembly and maintenance. Once a malfunction is detected, it can be resolved at any time.

When maintaining the pump, attention should be paid to several main parts.

A. Rolling bearings: When the oil pump runs for a long time and the bearings wear out to a certain extent, they need to be replaced.

B. Front sealing ring and rear sealing ring: When the sealing ring is worn to a certain extent, it needs to be replaced.

C. Mechanical seal: Mechanical seals should generally not be disassembled for inspection without oil leakage. If there is a serious leakage at the leakage port at the lower end of the bearing body, the mechanical seal should be disassembled and inspected. When installing and dismantling mechanical seals, they must be handled with care, paying attention to the cleanliness of the mating surfaces, protecting the mirror surfaces of the stationary and moving rings, and strictly prohibiting knocking and collision. The main reason for leakage caused by mechanical sealing is due to the rubbing of the mirror surface. The repair method can be to grind the friction surface to restore the mirror finish. Another reason for leakage in mechanical seals is improper installation or deformation and aging of the "o" - shaped rubber seal ring (or buffer pad). At this point, it is necessary to adjust or replace the "O" ring seal for reassembly.

2. Disassembly and assembly sequence of oil pump:

A. Remove the motor or disconnect the coupling.

B. Remove the bearing assembly, check the radial clearance between the impeller and the front ring, and check if the impeller nut is loose.

C. Remove the impeller nut, pull out the impeller, and check the radial clearance between the impeller and the rear sealing ring.

D. Loosen the set screw of the mechanical seal, pull out the dynamic ring part of the mechanical seal, check the fit of the dynamic and static ring end faces, and inspect the "o" - shaped sealing ring (or slow seal)

The sealing condition of the gasket.

E. Unscrew the fastening nut of the coupling and pull out the coupling.

F. Remove the bearing end cover and disassemble the pump shaft and bearing.

G. Assemble in reverse order during installation.

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