The high-pressure fuel pipe is a part of the high-pressure fuel circuit. It is required that the fuel pipe should bear a certain amount of oil pressure and have a certain fatigue strength to ensure the sealing requirements of the pipeline. The high-pressure fuel pipe for vehicles is mainly used in high-pressure injection diesel engines and high-pressure injection direct injection gasoline engines, and can withstand the oil pressure required during engine operation.
Chinese name
High pressure oil pipe
Structure
Steel wire winding skeleton layer
Classification
High pressure steel wire braided hose
Purpose
Submarine natural gas transmission and oil transportation
The oil pipe is composed of steel wire wound skeleton layer and internal and external oil resistant and corrosion resistant synthetic rubber, which is used for the transmission of hydraulic oil pipe of construction machinery, submarine natural gas, oil, irrigation, steel plant, chemical plant and other media.[1]
Classification: high pressure steel wire braided hose, high pressure steel wire wound hose, large diameter high pressure hose, steel wire (fiber) reinforced nylon elastomer resin pipe, steel wire reinforced soft, ultra-high pressure hose, high temperature resistant hose, polyurethane hose.
Structure: high pressure oil pipe is composed of steel wire winding skeleton layer, internal and external oil resistant rubber, corrosion resistant synthetic rubber and weathering resistant special rubber.
Usage: used for excavator, loader, side dump, hydraulic power, hydraulic support, cement conveying pipe, agricultural irrigation hose, hydraulic oil pipe of construction machinery, submarine natural gas transmission, oil transportation.
Abnormal vibration
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Abnormal vibration at the joint of high-pressure oil pipe, which leads to oil leakage accident, is a complex problem.Because the high-pressure fuel pipe connects the high-pressure fuel pump and the fuel injector, it belongs to the fuel injection system and plays a very important role.
High pressure oil pipe can withstand high pressure up to 150MPa, abnormal vibration will cause huge losses, and there is also a great fire hazard.To troubleshootFuel injectorThe opening and closing of the needle valve will cause strong high-frequency vibration of the high-pressure oil pipe, which is one of the important reasons for the damage of the high-pressure oil pipe.To this end, the middle part of the high-pressure oil pipe can be fixed on adjacent bolts and other fasteners with clips to reduce resonance.In addition, the quality of the high-pressure oil pipe shall be controlled, and it shall be correctly assembled. The pipe clamp shall be installed in the correct position, and no missing installation is allowed.If the high-pressure oil pipe joint leaks, some emergency measures need to be known are:
1. Cut a soft metal sheet or plastic sheet into a small ring shape and pad it in the joint cavity, and then press the horn head;
2. Wrap the fuse and cotton thread around the shoulder several times along the tightening direction, and tighten the joint nut. Apply soap or chewed bubble gum and chewing gum on the nut seat.
Burst remedy
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When the rubber hose with the pressure of the hydraulic system between 25-8.0MPa breaks, the adhesive method can be adopted: wipe the area around the broken hose;Apply one of "anaerobic" glue, "epoxy resin" glue, "801" glue or "502" glue (the length of glue coating is about 2-3 times of the length of the broken part) on the broken part of the hose;Use adhesive tape or canvas strip to wind 4-5 layers of adhesive coating (each layer shall be coated with adhesive);Tie the ends of the wrapping tape and the canvas strip into a dead knot;It can be used after 15-20 minutes of solidification.Transposition method: in the hydraulic system, the rubber hoses of the same oil circuit have the same specifications, but bear different oil pressures.Most of the broken hoses are hoses that bear high oil pressure.For example, among the two oil pipes of the same specification on the boom cylinder of W4-60 excavator and ZL series loader, the oil pipe connected to the boom cylinder cavity always bears a large oil pressure.According to this, the transposition method can be used: simply glue or bind the broken hose;Interchange the oil pipes in the big and small cavities of the boom cylinder (that is, use the unbroken oil pipe to bear the high pressure, and use the damaged oil pipe that has been simply bonded or bundled to bear the low pressure).
matters needing attention
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The above methods are all emergency methods in case of emergencies, and the performance of the rubber hose will inevitably be greatly reduced. Therefore, in practical application, it is necessary to avoid the situation of rubber hose cracking, so it is necessary to check frequently and maintain more.
