Device and method for measuring the flow rate of a nozzle assembly

Abstract

The invention discloses a device and method for testing the flow rate of an oil nozzle assembly, which belongs to the technical field of oil nozzle flow testing. The flow test device for nozzle coupler includes clamping assembly, oil supply assembly, drive and control system; On the test pressure head, the tail of the needle valve penetrates the clamp body, the sealing slide plate and the test pressure head in sequence and abuts against the bottom end of the needle valve ejector rod, and the needle valve ejector rod, the test pressure head and the needle valve form a loop between each other. Oil chamber, a pressure chamber is formed between the needle valve and the clamp body; one end of the oil supply assembly communicates with the oil tank, and the other end communicates with the pressure chamber, and a flow meter is arranged between the oil supply assembly and the pressure chamber; the driver and the needle valve The ejector rod is driven and connected to drive the needle valve ejector rod to move in the vertical direction so that the needle valve is raised to a preset lift; the control system is respectively connected to the oil supply assembly and the driving member for control. Beneficial effects: good versatility and high work 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...

AI Technical Summary

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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