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The high-pressure 3ZB - 350 triplex plunger pump is a common industrial pump. Its working principle is based on the fundamental principle of positive displacement pumps, which realizes the suction and discharge of liquid through the reciprocating motion of the plunger in the cylinder. The following is a detailed introduction: I. Application Fields The high-pressure 3ZB - 350 triplex plunger pump is mainly used in the following operations in the oil drilling industry: Cementing Operation: In the process of oil drilling, cementing is a crucial step. Its purpose is to enhance the stability and sealing of the wellbore, ensuring the safety of subsequent drilling and production operations. The high-pressure 3ZB - 350 triplex plunger pump can transport cementing materials such as cement slurry to the specified downhole location at high pressure and large displacement, enabling the cement slurry to form a solid cement ring around the wellbore, achieving functions such as isolating the formation and protecting the casing. Fracturing Operation: For some low-permeability oil and gas reservoirs, fracturing operations are required to increase the production of oil and gas wells. This plunger pump can provide high-pressure liquid to inject fracturing fluid into the formation, causing the formation to form fractures, thereby increasing the seepage channels for oil and gas and improving the extraction efficiency of oil and gas. Well Flushing Operation: Well flushing is to remove oil, impurities, sediment, etc. from the well to keep the wellbore clean and unobstructed. The plunger pump can transport media such as clean water, crude oil, or special well-flushing fluid at high pressure to flush the wellbore wall and downhole equipment, carrying the dirt and impurities out of the wellhead. Drilling Fluid Circulation: During the drilling process, continuous circulation of drilling fluid is required to cool and lubricate the drill bit and carry cuttings. Although the mud pump is the main equipment for drilling fluid circulation, in some special situations or small-scale drilling operations, the 3ZB - 350 triplex plunger pump can also serve as an auxiliary equipment to provide power for the drilling fluid circulation, ensuring that the drilling fluid can circulate normally in the well and maintaining the smooth progress of the drilling operation. In general, the high-pressure 3ZB - 350 triplex plunger pump meets the technological requirements of various operations such as cementing, fracturing, and well flushing by providing high-pressure and large-displacement liquid transportation, which is of great significance for ensuring the quality and efficiency of drilling projects and increasing oil and gas production. II. Structural Composition The high-pressure 3ZB - 350 triplex plunger pump for oil drilling is mainly composed of the PG series power end and the T series fluid end. The following is a relevant introduction: PG Series Power End Crankshaft: It has a double-key eccentric wheel structure with a specific eccentricity. For example, in some models of the PG series, it is 63.5, which can convert the rotary motion into the reciprocating motion of the plunger. Connecting Rod: It is made of cast steel and processed by special tooling. It is connected to the connecting rod bearing seat with 6 double-ended bolts and self-locking nuts, transmitting the motion of the crankshaft to the crosshead. Crosshead: Generally made of nodular cast iron, it is designed as a full cylinder with an oil groove and is equipped with a semi-circular aluminum-magnesium alloy tile to bear the load of the connecting rod. It moves in a reciprocating linear motion under the drive of the connecting rod, providing stable linear motion guidance for the plunger. Gears: The large gear has a double-connected helical gear structure with a double-arc tooth profile, which can offset the axial force. It is made of alloy steel casting and undergoes tooth surface quenching treatment. The small gear shaft is an alloy steel forging, and the small gear and the shaft are an integral structure. Power transmission and speed change are realized through gear transmission. Housing and Pump Cover: The housing material varies according to different models. For example, PG04 uses castings, and PG05 uses a steel welded structure. Both have undergone stress relief treatment to provide support and protection for internal components. The pump cover plays a role in sealing and protection. T Series Fluid End Plunger Assembly: It is the key component for realizing the suction and discharge of liquid. The plunger moves reciprocally in the pump cylinder under the drive of the power end, forming a variable volume chamber through cooperation with the inner wall of the pump cylinder to complete the suction and discharge process of liquid. The parameters such as the diameter, length, and material of the plunger will be designed according to the working pressure and flow requirements of the pump. Pump Head: Usually made of high-strength forged steel, it has good compressive strength and sealing performance. The inside of the pump head is designed with a liquid inlet and a liquid outlet, which are connected to the plunger chamber. The flow direction of the liquid is controlled by a one-way valve to ensure that the liquid can only flow in one direction, realizing the normal operation of the pump. Valve Group: It includes the suction valve and the discharge valve, which are generally made of high-strength and high-wear-resistant materials such as cemented carbide. The suction valve opens when the plunger moves backward, allowing the liquid to smoothly enter the pump chamber. The discharge valve opens when the plunger moves forward, discharging the liquid in the pump chamber into the outlet pipeline. The performance of the valve group directly affects the flow and pressure stability of the pump. Sealing Parts: They are used to ensure the sealing of the fluid end and prevent liquid leakage. Common sealing parts include sealing rings and gaskets, which are generally made of oil-resistant, high-pressure-resistant rubber or polytetrafluoroethylene. Under high-pressure and high-frequency reciprocating motion, the sealing parts need to have good wear resistance and anti-aging performance. III. Movement Process Suction Process Plunger Moves Backward: When the crankshaft rotates, it drives the connecting rod to make the plunger move backward in the cylinder liner. At this time, the volume in the cylinder liner gradually increases. Pressure Drops: As the volume in the cylinder increases, the pressure drops rapidly. When the pressure in the cylinder is lower than the pressure of the liquid in the suction pipe, the suction valve is opened under the action of the pressure difference. Liquid Suction: The liquid enters the cylinder liner from the suction pipe until the plunger moves to the last position, and the suction process ends. For example, in the drainage operation in a coal mine shaft, the backward movement of the plunger reduces the pressure in the cylinder, sucking the mine water from the roadway into the cylinder of the pump. Discharge Process Plunger Moves Forward: The crankshaft continues to rotate, driving the plunger to move forward in the cylinder liner, and the volume in the cylinder liner gradually decreases. Pressure Rises: The liquid in the cylinder is squeezed, and the pressure rises sharply. When the pressure in the cylinder is higher than the pressure of the liquid in the discharge pipe, the suction valve closes, and the discharge valve is opened. Liquid Discharge: The liquid is squeezed by the plunger and enters the discharge pipe through the discharge valve to be transported to the required place. For example, in the process of oil transportation, under high pressure, the crude oil is pressed from the cylinder into the oil pipeline and transported to the refinery or storage tank. Three-cylinder Collaborative Operation: This pump has three cylinders, and the three plungers perform the suction and discharge processes in sequence with a certain phase difference. This design makes the flow of the pump more uniform, the pressure fluctuation smaller, and the operation more stable. For example, in chemical production, uniform flow and stable pressure are crucial for the precise control of chemical reactions, and the collaborative operation characteristic of the triplex plunger pump can meet this requirement. IV. Performance Parameters Pressure: Taking the 3ZB - 350 model of Kerry Petroleum as an example, the maximum pressure can reach 70 MPa. Flow Rate: Different flow rate outputs can be provided according to different working conditions and equipment configurations to meet the requirements of various operations for liquid transportation volume. Rotational Speed: It is related to the power source and transmission system equipped. A suitable rotational speed ensures that the plunger can perform reciprocating motion at a specified frequency, thereby ensuring the normal operation of the pump. Power: It needs to match the pressure, flow rate, and rotational speed parameters of the pump to provide sufficient power to drive the plunger to move and realize high-pressure liquid transportation. V. Advantages High-pressure Output: The 3ZB - 350 triplex plunger pump can generate relatively high pressure, usually reaching 35 MPa or more, and even some models can reach 70 MPa. This makes it suitable for operations requiring high pressure, such as oil field fracturing, high-pressure cleaning, and mine grouting, and can meet the strict requirements of these working conditions for liquid pressure. Flexible Flow Rate Adjustment: This plunger pump can achieve multi-stage speed regulation through the gearbox, realizing flexible adjustment of the flow rate within a certain range. It can conveniently adjust the flow rate according to different work requirements to adapt to various process parameter changes, improving the applicability and work efficiency of the equipment. Relatively Simple Structure: The structure is compact, with a weight of only 2,100 kilograms. Compared with ordinary products, it has a smaller volume and lighter weight, which is convenient for installation and transportation. The overall structure is relatively simple, mainly composed of basic components such as the pump body, plunger, cylinder, and transmission mechanism. This simple structure makes the maintenance and upkeep of the equipment relatively easy, reducing the maintenance cost and difficulty. It can also maintain good stability and reliability in some harsh working environments. High Work Efficiency: The design of the triplex plunger pump enables the reciprocating motion of the plunger to efficiently convert mechanical energy into the pressure energy and kinetic energy of the liquid during the working process, thereby achieving high work efficiency. Under the same power input, it can output a larger flow rate and pressure, improving the working efficiency of the entire system. Long Service Life: It uses high-quality components such as a large-torque gearbox that exceeds international standards, and the materials and manufacturing processes of each component are carefully designed and optimized. It has high wear resistance and corrosion resistance and can maintain good performance under long-term high-load working conditions, extending the service life of the equipment. VI. Daily Maintenance and Upkeep Maintenance Points Daily Inspection: Regularly check the running sound and vibration of the pump, observe whether there are any leaks at each connection part, and check whether parameters such as oil temperature, oil pressure, and liquid level are normal. Check the Running State: During the operation of the pump, often observe whether its running sound is normal and whether there are any abnormal vibrations and noises. If any abnormalities are found, the pump should be stopped immediately for inspection to determine whether it is caused by loose parts, wear, or other faults. Monitor Pressure and Flow Rate: Closely monitor the pressure and flow rate display values of the pump to ensure that they operate within the rated range. Abnormal fluctuations in pressure or flow rate may be caused by pipeline blockage, valve failure, or damage to internal components of the pump, and timely troubleshooting is required. Check the Sealing Condition: Check all sealing parts of the pump body, including the plunger and the cylinder, the connection of the inlet and outlet pipelines, etc., for any liquid leakage. Minor leaks can be tightened in time, and if the leakage is serious, the sealing elements need to be replaced. Check the Lubrication System: Check the oil level and oil quality of the lubricating oil. The oil level should be maintained within the normal scale range, and the oil quality should be clear, odorless, and free of obvious impurities. If the oil level is too low, it should be replenished in time, and if the oil quality deteriorates, the lubricating oil should be replaced. Regular Maintenance and Upkeep Replace Lubricating Oil: Depending on the frequency of use and the working environment, the lubricating oil should generally be replaced every 500 - 1,000 operating hours or every 3 - 6 months. When replacing, completely drain the old oil and clean the oil tank and lubricating pipeline with clean kerosene or a special cleaning agent, and then add an appropriate amount of new lubricating oil that meets the regulations. Check Wearing Parts: At regular intervals (such as every 1,000 - 2,000 operating hours), check the wearing parts such as the plunger, sealing ring, valve seat, and spring. Check whether there are any wear marks or scratches on the surface of the plunger, whether the sealing ring is aged or deformed, and whether the valve seat and spring are damaged. If there are any problems, replace them in time. Clean the Filter: The liquid inlet filter needs to be cleaned regularly, usually every 200 - 300 operating hours, to prevent impurities from clogging the filter and affecting the suction effect of the pump. If the filter is damaged, it should be replaced in time. Calibrate Instruments: Regularly calibrate the instruments such as the pressure gauge and flow meter on the pump, usually once a year, to ensure the accurate measurement of the instruments and provide reliable data for the operation monitoring of the pump. Tighten Connectors: Regularly (such as once a month) check the foundation bolts of the pump and the connecting bolts between various components to ensure that the connections are tight and prevent the bolts from loosening due to vibration, which may affect the normal operation of the pump. Maintenance and Upkeep in Special Situations Long-term Shutdown Maintenance: If the pump needs to be shut down for a long time, first drain the liquid in the pump, and then flush the pump body with clean water or a special cleaning agent to prevent the residual liquid from corroding the pump body. After flushing, an appropriate amount of anti-rust oil can be injected into the pump to protect the internal components. Maintenance after Fault Repair: After the pump fails and is repaired, in addition to focusing on checking the repaired parts, a comprehensive inspection and maintenance of the entire pump should also be carried out. For example, check whether the relevant parts are installed correctly and firmly, and run the new parts for a break-in period to ensure that the pump returns to normal operation.