This article continues to introduce the structure and working principle of mechanical blade type oil transfer pumps and plunger type oil transfer pumps for diesel generator sets.
The fuel consumption of diesel engines varies under different operating conditions. When the load is high, the fuel consumption is high, causing the pressure at the outlet of the fuel pump to decrease. At this time, the plunger is pushed by the plunger spring, increasing the stroke of the plunger and increasing the pump oil volume. On the contrary, as the load on the diesel engine decreases, the fuel consumption decreases, the pressure at the outlet of the fuel transfer pump increases, the plunger stroke decreases, and the pump fuel volume decreases accordingly.
The oil drain hole is used to remove fuel from the gap between the push rod and the pump body, preventing fuel from flowing along the push rod. Insert the tappet into the cam chamber to dilute the lubricating oil in the cam chamber.
The fuel pump is also equipped with a manual fuel pump to remove air from the fuel system. When in use, the handle can be pulled up and down. When the handle is raised, the plunger of the hand oil pump moves upward, and the pressure below the plunger decreases. Fuel enters the fuel valve from the inlet and flows into the upper part of the fuel transfer pump plunger through the oil passage. When the handle is pressed down, the inlet valve closes. The oil pressure above the fuel pump increases, and the check valve is pushed open to pressure the fuel out from the outlet.
The fuel pump is a single acting piston type, installed on the side of the fuel injection spring and driven by an eccentric wheel on the fuel injection pump shaft. Its function is to suck fuel from the fuel tank and supply sufficient fuel to the fuel injection pump at a certain pressure. Before starting the diesel engine, the hand pump on the fuel pump is used to pump oil and remove air from the oil circuit. It can smoothly suck up fuel within 1 meter below the center of the fuel pump within 0.5 minutes. After pumping, the handle nut must be tightened.
The 46 cylinder B series and B series reinforced fuel injection pumps use roller type fuel transfer pumps, while the 12 cylinder B series fuel injection pump is equipped with two roller type fuel transfer pumps with inlet and outlet pipe joints on the left side and a separate hand pump installed at the front end of the diesel engine body.
The working principle of the fuel transfer pump: When the roller and top rod of the fuel transfer pump are at the lowest position of the eccentric wheel of the fuel injection pump, the piston is pushed upward by the action of the spring, and the fuel in the upper chamber of the piston is expelled. At this point, the one-way valve on the oil outlet side closes, and fuel is sent to the fuel filter, creating a space in the lower chamber of the piston The one-way valve of the fuel inlet is opened, sucking in fuel. The eccentric wheel continues to rotate, and the movable chamber begins to move downwards until the roller and top rod come into contact with the highest point of the eccentric wheel. The fuel is squeezed open and enters the upper cavity of the piston through the one-way valve on the outlet side. This cycle continues, sucking in and discharging the fuel. When the positive force of the oil outlet pipeline increases to the point where the oil pressure at both ends of the piston is equal, the piston no longer moves with the top rod to maintain balance, and the oil pump stops working.
Dingbo Power was founded in 1974 and is one of the earliest manufacturers of generators and diesel generator sets in China. If you want get more information, please feel free to send email to sales@dieselgeneratortech.com we will pay highly attention on your question.
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