Light and heavy fuel boosting gear pump

The light and heavy fuel boosting gear pump is a volumetric boosting and conveying equipment for the fuel system. It adopts a high alloy gear structure and is suitable for conveying medium in the narrow and narrow viscosity range of light diesel and heavy fuel oil. It can also be equipped with an external clearance fine adjustment structure and an internal overload valve, ensuring stable pressure output. Some models are equipped with insulation jackets to prevent heavy oil from solidifying at low temperatures, which are used for boiler and burner oil supply and boosting. Modular disassembly and maintenance are convenient.

#Product Details of Light and Heavy Fuel Boosting Gear Pump

The light and heavy fuel boosting gear pump is a volumetric boosting and conveying component designed for industrial fuel supply systems. It is specifically suitable for switching between light and heavy fuel conveying conditions, and can transport low viscosity light diesel, as well as medium and high viscosity heavy oil and fuel oil. Unlike single medium conveying oil pumps, it is used in industrial boilers, asphalt mixing stations, incinerators, and heating equipment burners for fuel supply and boosting systems. It is also suitable for fuel transfer and fuel pretreatment processes in oil depots. The whole machine can choose between two structures: ordinary room temperature type and jacket insulation type, which can adapt to all-weather continuous pressurized oil supply and also support intermittent oil supply mode with equipment start stop alternation.

The entire unit consists of a pump body, front and rear pump covers, heat-treated alloy master and slave gears, quenched and tempered transmission shaft, floating thrust plate, shaft end sealing component, and built-in reflux valve to form a conveying unit. According to the requirements of the working conditions, an external end face clearance fine adjustment screw can be added. After long-term operation pressure attenuation, the gear fit clearance can be adjusted without disassembling the whole machine, and the rated boosting capacity can be restored. The gears have undergone nitriding and hardening treatment, providing resistance to erosion; A multi-channel axial force balance structure is arranged inside the cavity to counteract the unidirectional thrust generated by gear rotation under pressurization conditions, reduce unilateral wear of the thrust plate, and ensure smooth vibration during long-term pressurization operation. The internal moving components rely on the delivery of fuel to achieve self lubrication, without the need for additional independent lubrication oil circuits, simplifying the layout of on-site pipelines. For the conditions where heavy oil is prone to solidification, the jacket version of the pump body and pump cover are integrated with an insulation layer, which can be continuously supplied with steam and heat transfer oil to prevent the shutdown medium from cooling and blocking the gears.

After the device is connected to the driving power, the motor drives the gears to rotate synchronously through an elastic coupling. The volume of the cavity on the side where the gears disengage continues to expand, forming negative pressure. The fuel in the storage tank is filled into the gear teeth gap through a widened and smooth oil inlet channel. As the gear continues to rotate, the medium carried by the tooth groove is transported along the inner wall of the pump casing to the oil pressure area. The gear re engages with the compression chamber volume, and the fuel forms a stable pressure output to the burner pipeline. The entire process of suction, transportation, pressurization, and discharge runs continuously. The pump body has a smooth and unobstructed flow channel, which takes into account the low resistance transportation of light diesel and the flow requirements of heavy oil. The flow pulsation amplitude is small, the fuel supply pressure of the burner is stable, and the fuel is fully atomized.

The pump body is integrated with a built-in reflux valve, which is responsible for short-term overload protection and has a preset opening pressure at the factory. When the outlet pipeline is blocked, the valve is closed, and the pressure inside the chamber exceeds the rated range, the valve automatically opens, and some of the medium flows back to the oil suction chamber to release high pressure, reducing pressure impact and causing damage to the pump body, fuel pipeline, and burner accessories. This structure is only suitable for temporary protection in case of sudden blockage and cannot be used as a stabilizing device for a long time. When the working conditions require stabilizing, independent pressure regulating accessories can be installed in the external pipeline to work together. The inner wall of the pump body has been smoothed to prevent the accumulation of gum and impurities, thereby reducing the problem of decreased volumetric efficiency caused by long-term operation. The device has self-priming capability, and only a small amount of medium needs to be pre filled into the chamber for initial startup, simplifying the startup operation.

The sealing matching can be selected based on the temperature of the medium and the type of oil, using either packing seals or hard alloy mechanical seals. Select anti swelling sealing accessories for the transportation of light diesel fuel under working conditions; Seal structure is selected for high-temperature heavy oil working conditions. The sealing component tightly fits the gap between the transmission shaft and the pump cover, reducing the risk of fuel leakage, while blocking dust and water vapor from entering the cavity, and preventing hard impurities from scratching the gear tooth surface. The disassembly and assembly process of sealing accessories has been optimized, and daily maintenance does not require the overall disassembly of the pump body. Only the outer pump cover can be replaced, shortening the downtime of heating equipment. Conventional sealing is suitable for medium temperatures not exceeding 200 ℃, and special sealing components can be upgraded for high temperature continuous oil supply conditions.

At the medium adaptation level, this series of booster gear pumps is suitable for conveying fuel media that do not contain hard metal particles, long fiber impurities, and have lubricating properties. The medium's kinematic viscosity covers 5 to 1500mm ²/s, and is suitable for light and heavy fuel categories such as light diesel, fuel oil, heavy oil, and heavy diesel. Ordinary cast iron models are suitable for clean fuel transportation; Steel casting models are suitable for industrial fuel oils containing trace impurities; Paired with motor units, it can meet the oil supply needs of oil depots and chemical workshops. The equipment is not suitable for transporting highly corrosive and volatile media with flash points. The metal components in contact with the medium have undergone rust prevention treatment and are suitable for outdoor dusty working environments such as boiler rooms and mixing stations. The insulation machine can cope with low-temperature outdoor heavy oil transportation conditions.

In terms of installation and matching, the horizontal base of the whole machine is reserved with standard anchor fixing holes, and the ground installation is stable. The inlet and outlet can be flexibly adjusted according to the layout of the fuel pipeline, and the large-diameter interface reduces the flow resistance of the medium. The power end is equipped with an elastic coupling, which corrects the coaxiality during assembly, buffers the hydraulic impact under pressure boosting conditions, and reduces unilateral wear of the transmission shaft. Install a large area pre filter on the suction pipeline, with a flow area larger than the cross-sectional area of the inlet pipe, to intercept impurities from the bottom of the storage tank and prevent damage to the gears; All pipeline joints are equipped with oil resistant sealing gaskets to prevent air from infiltrating the chamber and causing pressure fluctuations. Before starting, check that the motor direction is consistent with the pump body identification. When the jacket type is transporting heavy oil, priority should be given to preheating the pump body with a heat source. It is forbidden to forcefully start the pump in a low-temperature solidification state, and it is also forbidden to fully close the outlet valve and operate it under pressure for a long time.

At the level of daily maintenance operations, the pump body adopts modular assembly, and the alloy gear, thrust plate, seal, and pump cover can be separately disassembled and taken out. General and simple tools can be used to complete the disassembly, making it easy to regularly clean the internal glue and impurities of the cavity, and check the wear status of the gear and thrust plate. The meshing force of the gears is balanced, and the overall vibration amplitude of the machine is low. With the use of shock-absorbing gaskets, the operating noise can be controlled, and it is suitable for the uninterrupted boosting and oil supply mode of the heating system throughout the day. Daily maintenance of inlet filter cleanliness, regular inspection of seal leakage, control of medium temperature range, avoidance of long-term overload operation of equipment, and adjustment of end face clearance as needed when pressure drops can prolong the service life of gears and sealing accessories, reduce unplanned shutdown frequency of boilers and mixing stations. After long-term shutdown, the insulation machine continues to maintain the temperature of the chamber, drain the residual heavy oil in the pump, and prevent the medium from solidifying and jamming the gear components.

During long-term use, the equipment failure rate is relatively low. As long as we adhere to media pre filtration, regular quarterly inspections, and standardized start stop operations, the core components can maintain stable pressure boosting and oil supply conditions for a long time. There are no large areas of dead corners in the internal flow channel. After shutdown, a clean fuel circulation flushing chamber is introduced to reduce the problems of insufficient boost and flow decline caused by gum accumulation, reduce the frequency of disassembly and cleaning of the whole machine, and ensure the stable operation of the entire fuel combustion system.

Overall, the light and heavy fuel booster gear pump relies on high alloy gears, optional external clearance fine adjustment structure, and built-in overload valve, and is divided into two forms: room temperature type and jacket insulation. It meets the needs of light and heavy fuel with wide and narrow viscosity transportation, stable boosting output, and is suitable for industrial boilers and mixing station burners for fuel boosting and oil supply. It can meet the basic needs of long-term continuous and stable pressure boosting transportation of light and heavy fuel.