High pressure tubing manufacturer explains the principle of high pressure tubing

High pressure oil pipe is the entrance of connecting high pressure common rail pipe and fuel injection pump of electric control system. It needs sufficient total fuel flow to reduce the pressure drop of fuel flow, and make the working pressure in the high pressure pipeline system change less, can withstand the impact of high pressure fuel, and the working pressure in the high pressure common rail can be quickly constructed when opened. The size of the high-pressure tubing of each cylinder should be the same as far as possible, so that each injection pump of the diesel engine has the same injection working pressure, and the oil supply reduces the deviation of the injection amount between the engine cylinders. The high pressure tubing should be avoided as far as possible, so as to minimize the working pressure loss from the high pressure common rail to the injector. The outer diameter of the company's high pressure tubing is 6 mm and the inner diameter is 2.4mm. The outer diameter of Denso's high pressure tubing is 8 mm and the inner diameter is 3 mm. High pressure tubing manufacturer

The high pressure in the high pressure common rail chamber can be directly applied to the gusher and can also reduce the supercharger mechanism in the fuel injection pump. In addition, the high pressure in the high pressure common rail chamber is continuous high pressure, and the driving torque of the oil pump is much smaller than that of the traditional gasoline pump.

Through the working pressure on the oil pump to control the vacuum solenoid valve, but also according to the engine load, economy and emission standards to sensitively control the oil pressure in the high pressure common rail chamber, especially to improve the engine slow speed performance index. High pressure tubing manufacturer

Through the vacuum solenoid valve on the injection pump to control the gushing on time check, gushing oil quantity and gushing speed, but also sensitive to control the pre-gushing and post-gushing oil quantity and main gushing.

The high pressure common rail system consists of five parts, namely high pressure oil pump, common rail chamber and high pressure tubing, fuel injector, ECU, various sensors and actuators. The fuel supply pump sends the fuel pump from the tank to the oil inlet of the high pressure oil pump. The high pressure oil pump driven by the engine pressurizes the fuel and sends it into the common rail chamber. Then the solenoid valve controls the fuel injectors of each cylinder to inject oil at the corresponding time. High pressure tubing manufacturer

Pre-injection reduces the rate of pressure rise and peak pressure by injecting a small amount of fuel into the cylinder prior to the main injection, where it is pre-mixed or partially burned to shorten the fire delay of the main injection. Engine operation is relatively relaxed, while reducing cylinder temperature and nox emissions. Pre-injection also reduces the possibility of fire and improves the cold performance of high pressure common rail systems. High pressure tubing manufacturer

The main injection initially reduces the injection rate and also reduces the amount of oil injected into the cylinder during fire delays. Increasing the injection speed in the middle of the main injection can shorten the injection time, thus shortening the slow burning period, and complete the combustion within the more effective crankshaft Angle range of the engine, increasing the output power, reducing fuel consumption, and reducing carbon emissions. Rapid oil cutoff at the end of the main injection reduces incomplete combustion of fuel, reducing smoke and hydrocarbon emissions.