Measuring device for oil injection rule of each hole of oil injection nozzle of diesel engine

Abstract

The invention provides a measuring device for an oil injection rule of each hole of an oil injection nozzle of a diesel engine. The measuring device comprises a constant volume bomb matrix with holes in the upper end face, a data acquisition and analysis system and a computer, wherein at least sensor devices same as the holes of the to-be-measured oil injection nozzle in number are arranged in the constant volume bomb matrix; each sensor device comprises a force sensor, a bracket and a pedestal; each pedestal is positioned on a lower end cover of the constant volume bomb matrix; the end face, close to the to-be-measured oil injection nozzle, of each force sensor connected with the corresponding bracket is perpendicular to the axis of a to-be-measured injection hole; the data acquisition and analysis system is connected with the computer; at least one side end face of the constant volume bomb matrix is provided with at least one hole allowing a signal line to pass through; one end of the signal line is connected with the corresponding force sensor, and the other end of the signal line is connected with the data acquisition and analysis system. According to the device, accurate measurement of the oil injection rule of each hole of the porous oil injection nozzle can be realized; the signals measured by all the force sensors can be collected by the multi-channel data acquisition and analysis system; the measuring device has actual application significance.

Description

technical field [0001] The invention relates to a measuring device for the fuel injection regularity of each hole of a fuel injector of a diesel engine, especially suitable for measuring the fuel spray regularity of each hole of a hole type fuel injector, and belongs to the technical field of diesel engine fuel injectors. Background technique [0002] The quality of the diesel engine combustion process is not only affected by the shape of the combustion chamber and the air flow characteristics in the cylinder, but also depends to a large extent on the fuel injection process and spray conditions of the fuel system. As a key component of the fuel supply system, the fuel injector's injection characteristics directly affect the atomization, heating, evaporation, and mixing with air of the fuel, which in turn affects the combustion, heat release, soot, and harmful exhaust gas formation of the diesel engine. [0003] For multi-hole injectors, due to the error of the machining proc...

AI Technical Summary

Problems solved by technology

However, for multi-hole injectors, it can only give the test results of the total injection pattern of all injection holes, but it cannot accurately test the injection pattern of each hole and the possible differences in the injection pattern of each hole.

[0005] At present, we know that there is a deformation test method for the test of each nozzle hole of the fuel injector. The test device is mainly based on the deformation of the diaphragm equipped with a strain gauge at one end of the test chamber corresponding to each nozzle hole under the action of fuel injection. To detect the instantaneous fuel injection quantity of each hole, and then obtain the fuel injection law of each hole, but this test method has not been substantively verified for feasibility, and in view of the characteristics of the test device itself (nozzles with different nozzle hole arrangements need to Independent test system), there are certain difficulties in the application and promotion of this test method

In addition, there is a test bench for the mass flow rate between holes to test the mass flow rate of each hole. The test bench isolates each spray jet through a special processing block (on the processing block used, each spray jet corresponds to A tapered hole), the gas phase and liquid phase of each spray jet are introduced into the corresponding siphon devices, and then the respective fuel injection volumes are obtained. The fuel injection volume of each hole can be tested by using this device. In theory, it is also The fuel injection law of each hole can be tested, but due to the poor dynamic response characteristics of the siphon device, it is still difficult to use this device to test the fuel injection law of each hole of the target fuel injection system, especially the continuous test

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