Oil nozzle matching part flow testing device and method

Abstract

The invention discloses an oil nozzle matching part flow testing device and method, and belongs to the technical field of oil nozzle flow testing. The oil nozzle matching part flow testing device comprises a clamping assembly, an oil supply assembly, a driving part and a control system. The clamping assembly comprises a clamp body, a sealing sliding plate, a testing pressure head and a needle valve ejector rod, the needle valve ejector rod is movably arranged on the testing pressure head in a penetrating mode, the tail of a needle valve sequentially penetrates into the clamp body, the sealing sliding plate and the testing pressure head and abuts against the bottom end of the needle valve ejector rod, and an oil return cavity is formed among the needle valve ejector rod, the testing pressure head and the needle valve. A pressure cavity is formed between the needle valve and the clamp body. One end of the oil supply assembly communicates with an oil tank, the other end of the oil supply assembly communicates with a pressure cavity, and a flowmeter is arranged between the oil supply assembly and the pressure cavity. The driving part is in driving connection with the needle valve ejector rod and used for driving the needle valve ejector rod to move in the vertical direction, so that the needle valve rises to the preset lift range. The control system is separately in control connection with the oil supply assembly and the driving part. The oil nozzle matching part flow testing device and method have the beneficial effects of being good in universality and high in working efficiency.

Description

technical field [0001] The invention relates to the technical field of oil nozzle flow testing, in particular to a flow testing device and method for an oil nozzle assembly. Background technique [0002] In the research and development process of the fuel injector, it is necessary to test the actual flow value of the nozzle of the fuel injector at different lifts to complete the design parameter verification of the nozzle; and to test the nozzle at a certain fixed lift during the manufacturing process The flow rate is to meet the production quality consistency of the nozzle. Among them, the nozzle is usually a long needle valve nozzle assembly, and the flow test of the long needle valve nozzle assembly needs to be completed by the nozzle assembly flow test device. Among them, the flow test refers to lifting the needle valve of the long needle valve nozzle assembly to a certain height lift, so that the oil circuit where the long needle valve nozzle assembly to be tested is l...

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Problems solved by technology

[0004] However, in the current flow test device for the nozzle coupler, a stepped surface or an annular groove must be provided at the tail of the needle valve to assemble the spring, and the sliding sleeve is pressed tightly to form a high-pressure seal, so that the tail of the needle valve can be positioned at the oil-free position. In the pressure zone, it is impossible to complete the nozzle flow test without ring groove or step surface at the end of the needle valve, resulting in poor versatility; the lifting height of the needle valve is limited by the manual fine-tuning knob, the work efficiency is low and the accuracy of manual adjustment cannot be achieved. Guarantee; and when actually testing the flow rate of the nozzle assembly under different lifts, after the test nozzle is clamped, it is necessary to open the safety door of the flow test bench many times in the state of clamping and pressing, which is complicated and cumbersome.

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