Combined type accumulator tube for high-pressure common rail system

Abstract

The invention relates to a combined type accumulator tube for a high-pressure common rail system. The combined type accumulator tube comprises a pressure sensor, spherical sealing bodies, a flow-limiting valve, fastening seat rings, an accumulator tube body, a pressure limiting valve and an oil inlet joint, wherein connection holes are arranged on the two ends of a centre through hole of the accumulator tube body; tapered surfaces are arranged on the inner ends of the connection holes; the two spherical sealing bodies are respectively assembled in the connection holes on the two ends of the accumulator tube body; the pressure sensor and the pressure limiting valve are directly arranged on the accumulator tube body and pressed against the spherical sealing bodies; two tapered holes are respectively arranged on the accumulator tube body; the tapered holes are communicated with the centre through hole of the accumulator tube body; the two spherical sealing bodies are respectively arranged in the two tapered holes; the two fastening seat rings are sleeved on the accumulator tube body; installation holes are arranged on the fastening seat rings; the flow-limiting valve and the oil inlet joint are respectively connected with a fastening seat ring and are pressed against the spherical sealing bodies. The combined type accumulator tube is formed by combining a plurality of mutually freestanding parts without forging; the same parts are formed in a standard manner, so that the utilization rate of the parts is greatly improved.

Description

technical field [0001] The invention relates to a pressure accumulator of a high-pressure common rail system used by a diesel engine to reduce emissions, in particular to a combined pressure accumulator of a high-pressure common rail system. Background technique [0002] The pressure accumulator is an important part of the high-pressure common rail system. It can store the high-pressure oil provided by the fuel injection pump, and can withstand the oil pressure of 80-160MPa, and provide constant high-pressure oil to the electronically controlled fuel injector through the oil pipe. ;The oil pipe is connected between the pressure accumulator pipe and the fuel injection pump, and the oil pipe is connected between the pressure accumulator pipe and the diesel engine with the electronically controlled fuel injector of each cylinder; in order to ensure the safe and reliable operation of the pressure accumulator pipe, ensure that the joints do not leak Generally, the pressure storag...

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Problems solved by technology

[0002] The pressure accumulator is an important part of the high-pressure common rail system. It can store the high-pressure oil provided by the fuel injection pump, and can withstand the oil pressure of 80-160MPa, and provide constant high-pressure oil to the electronically controlled fuel injector through the oil pipe. ;The oil pipe is connected between the pressure accumulator pipe and the fuel injection pump, and the oil pipe is connected between the pressure accumulator pipe and the diesel engine with the electronically controlled fuel injector of each cylinder; in order to ensure the safe and reliable operation of the pressure accumulator pipe, ensure that the joints do not leak Generally, the pressure storage tube is forged integrally, and the oil pipe joint and the pressure storage tube body are forged as one to ensure the pressure resistance and sealing performance of the pressure storage tube. However, the overall forging cost is high, processing is difficult, and the scrap rate is high. If part of it is damaged during the process, the pressure accumulator tube will be discarded as a whole, resulting in a lot of waste

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