Single pump related knowledge

1. The composition of the single pump consists of piston, plunger sleeve, return spring, spring seat, oil outlet valve, oil outlet valve seat, oil outlet valve spring and oil outlet valve. 2. Outlet valve structure 1) out valve and valve seat is a precision couple, made of high quality alloy steel, the guide hole, the upper and lower ends and seat hole after precision machining and grinding, after the match can not be exchanged. 2) The conical part of the oil outlet valve is the axial seal conical surface of the valve. The cone part of the valve slides in the guide hole to act as a guide. Tail processing groove, cross-shaped cross-section, so that the fuel through. The middle of the oil valve called the cylinder vacuum surface, with the sealing cone between the formation of a decompression volume. 3) The lower end face of the valve seat and the upper end face of the plunger sleeve are closely fitted by precision machining. They are pressed by the tightening nut at the specified tightening torque. Compression between the nut and the seat has a thickness of copper high-pressure gaskets. There is also a low pressure gaskets between the outlet nut and the top of the housing. 4) In the oil pressure valve nut is equipped with groove reduction tank, in order to reduce the volume of cavity space, to promote rapid spray stop, limit the maximum lift valve role. 3. The role of the oil valve 1) Prevent the oil drip before injection to improve the injection speed: When the fuel injection pump, until the oil pressure is higher than the preloading valve spring preload and residual pressure in the high-pressure tubing, the oil The valve rises and its sealing cone leaves the valve seat. Must wait until the vacuum valve on the valve with the valve seat completely out of the pilot hole, the pump oil chamber to enter the high-pressure fuel pipe. p pump> p spring + p residual - open; p pump spring + p residual - off. 2) to prevent drip after fuel injection, increase the closing speed: stop the fuel supply, the lower end of the pressure relief valve out of the oil into the catheter, the high-pressure tubing and pump chamber access will be cut off. When the oil valve is fully landed after a drop of a distance, so the high-pressure tubing volume has been increased, so that the rapid decline in oil pressure 1MPa ~ 2MPa, quickly and simply off the oil to prevent the fluctuation due to hydraulic pressure and "pipe shrink" And produce after the spray drops. 3) to prevent the reverse flow of fuel, the high-pressure tubing to maintain a certain residual pressure.

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