Novel pressure regulating valve structure

Abstract

The invention belongs to the technical field of diesel oil and natural gas dual fuel injection systems, and particularly relates to a novel pressure regulating valve structure. The novel pressure regulating valve structure comprises a regulating valve body, a piston, a valve joint and a valve seat. The piston is arranged in the regulating valve body. A piston gas cavity is formed by the piston andthe regulating valve body. A pressure relief gas channel is arranged at the bottom of the regulating valve body. The valve seat is arranged at the position, corresponding to the pressure relief gas channel, in the regulating valve body. A valve rod is arranged in the piston. The valve seat presses a steel ball onto a regulating valve body sealing conic face of the regulating valve body through spring force of a valve rod spring. The valve joint is arranged on the regulating valve body and is provided with an oil inlet hole. An oil cavity is formed between the valve joint and the piston. The novel pressure regulating valve structure has the beneficial effects that the structure is simple; the sealing structure is effective and reliable; the problem of serious leaking of current pressure regulating valve products is solved; the machining difficulty is reduced; and arrangement complexity of an oil channel and the gas channel is reduced.

Description

technical field [0001] The invention belongs to the technical field of diesel and natural gas dual-fuel injection systems, and in particular relates to a novel pressure regulating valve structure. Background technique [0002] Currently, medium and heavy-duty vehicles on the market mainly use diesel as fuel, and the combustion efficiency of this type of internal combustion engine is basically lower than 39%. Rail system) matching costs and technical difficulties are gradually increasing, which also brings about an increase in cost. [0003] With the adjustment of the country's energy structure and the improvement of emission requirements, the traditional internal combustion engines that use gasoline and diesel as combustion media will gradually decrease. Natural gas is rich in resources in my country, and it has gradually been used in the automobile market as an alternative fuel to diesel. However, the current natural gas internal combustion engines are all port injection,...

AI Technical Summary

Problems solved by technology

[0005] In the above-mentioned dual-fuel direct injection system, the pressure difference between natural gas and diesel oil needs to be controlled accurately and quickly, so the system must have a self-balancing pressure regulating valve to control the pressure of natural gas. At present, there is no mature pressure regulating valve product on the market. Some products are still in the sample stage, and their structures are complex, difficult to process, poor followability of natural gas pressure to diesel pressure, unstable pressure difference, easy to wear, and the performance and reliability of existing products cannot meet the requirements of dual-fuel systems

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