CS205452B1 - Instrument for quality checking of injection system of oil engines - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for checking the quality of an injection device for diesel engines, and more particularly to the tightness and flow rate of discharge valves and injection nozzles comprising an injection unit equipped with a test discharge valve and an injector with a test injection nozzle, a fuel reservoir, a low pressure filling circuit and an electric motor. by means of a coupling with an injection unit, interconnected by a discharge line with an injector, by raining into a still collector under which a glass scale is placed.

In an effort to doolllt oo the least smoke and iodine content in the exhaust gases of modern diesel engines, there are increasingly stringent requirements for equal supply of fuel transported by individual injection jacks of the injection pump to the engine rolls.

In the known in-line injection pumps, for example, at the nominal speed of the injection pump, the sizing can be adjusted by rotating the pistons in the individual injection sections for the same delivery rate per cycle for all injection sections, but at the same control rod position deliveries from the individual injection molding machines. Photo The distribution of the supply is usually expressed by the so-called dispersion of the supply according to the relationship

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V «V max min

D. —-. 100 (%) ^v. Three kt V _m . ^ - the next measured delivery,

Y _m4h - Nothing turns on delivery per cycle;

▼ _e * arithmetic mean delivery value.

Supply D Dispersion Value D Siní for known injection pumps 6 1 more prooent.

These present values of supply variance D are considered to be unacceptably high and the effort is to reduce to about 1% in the future,

Said dispersion of the supply when the speed is changed, however, when the injection pump control rod is in the upright position, is unequal, and the speed is varied by the function of a plurality of knots into a single unit of injection unit starting from the cam to the injection nozzle. Detailed analyzes have shown that the non-equivalent operation of discharge valves and injection nozzles has the greatest influence on the dispersion value of the supply,

In both of these nodes, unequal operation occurs both due to non-compliance with the production-intensive geometrical dimensions and dimensions of the parts, but in particular to flow losses, unequal and variable, and a change in the speed of the injection pump,

Known pneumatic devices or flow methods for determining the value of the wire coefficients in sorting, for example, discharge valves, injection nozzles and the like, are not well known and, moreover, give biased results, in particular

This does not affect the effects of the complex non-stationary fuel flow that is typical of the pump displacement.

The above-mentioned drawbacks are eliminated by a device for checking the quality of an injection device for diesel engines, in particular for leaks and discharge valves and injection nozzles, consisting of an injector comprising the injector to be tested, fuel tank data, low pressure filling circuit and electric motor coaxial energy to operate at two constant speed unequal heights and connected by a coupling to the injection unit, interconnected by a discharge line with an injector injecting into the collector, below which a glass scale is placed,

It consists of having a cavity in a pick-up collector, into which the injector connects through the discharge pipe to the outlet of the injection unit, and a glass scale comprising a reclaimed slide, one outlet raining into the inclined monsoon and the other outlet outside, the adjustable slide provided with a lever whose cone is connected and spring and by means of a rod with a movable core of electromagnets, connected to a speed counter and a button.

According to another embodiment, the essence of the invention is also that the piston of the injection unit is provided below its upper face with a peripheral groove, the upper edge of which is guided

205 452 parallel to the pieto sele, this surface circumferential groove being interconnected by a radial channel drilled therein and a β-connected axial channel with the space above the heel.

The device according to the invention makes it possible to carry out an assessment of the injection device nodes under conditions very close to the actual operation and guarantees an objective assessment.

An embodiment of the device according to the invention is shown schematically in the accompanying drawings, in which Fig. 1 shows the injection unit in vertical section, Fig. 2 shows the hematite arrangement of the oil device and Figs.

The injection unit is substantially the same as that of a conventional injection pump, particularly with respect to the arrangement of the cam 11, the jack 12, the roll 13, the piston spring 15, the discharge valve 16 and the throat 17. However, this injection unit is simplified change the size of the displaced fuel volume by the injection pump, this adjustment is intentional to prevent this volume from decreasing due to the rotation of the piston 14> The piston 14 is provided with an over-yellow groove 141 "interconnected by an axial and radial channel with space above the piston 14"

The dispensed fuel volume per cycle is then given by the product of the cross section of the piston 14 and the effective stroke, the effective stroke of the piston 14 being equal to the difference in piston length 14 from its face to the upper edge of said annular surface groove 141 and the diameter of the feed channel 131. of the piston 14 and the displacement volume per cycle is approximately the same as the injection pump for which the test component is intended.

The injection unit 1 is connected to the clutch £ second electric motor shaft 2 is provided in known manner so that it can operate at two constant speed such as 1400 rpm and at 700 min ^"3. The electric motor 2 is controlled by a switch 21 whose push button ko 211 brings the electric motor 2 to a higher speed, another button 212 to a lower speed and a third button 213 serves to stop the electric motor 2,

A feed pump 1 of known construction, driven from the camshaft of the injection unit 1, draws fuel from the fuel reservoir 6 and pushes it through the fuel cleaner 2 to the feed channel 131.

The fuel discharged by the injection unit 1 is led through the discharge line 18 to the injector χ, from which it injects through the injection nozzle 71 into the collector 72, from where it flows via the slide valve 73 either via line 77 back to fuel tank 6 or tube 78 to glass gauge 8. The lever 74 is mounted on the protruding cone of the slide valve 73 and is connected to a pull rod 72 connected to the movable core 801 of the electromagnet gfi. on the other hand, with a spring Ji acting against the tension of the electromagnet 80.

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The X-jumper, formed in a manner known per se as a source of pulse, feeds a speed counter 28, also known in construction, actuated by a button 22 and connected to the winding of the electromagnet 8 *.

Fig. 3 shows the slider 73 in the position it is in when measuring the fuel supply. The fuel ejected from the injection nozzle 71 is discharged to the gauge 8, the outlet of which is closed by the discharge valve 81. 81 hand lever 811 by 90 ° ·

Fig. 4 shows the slider 73 in the tz position prior to the delivery measurement, when the fuel being discharged through the pipe 21 goes back to the fuel reservoir.

By pressing button 211 s, the electric motor 2 is brought to a higher speed. The spring 76 holds the slide valve 23 shown in Fig. * 4 * Spray fuel is discharged through the pipe 77 back to the fuel reservoir J. Drain valve 81 is closed. current to the electromagnet 80, the core of which 801, by means of the rod 23 and the lever 74, rotates the slide 73 to the position shown in FIG. 3. At the same time, the speed counter 23 starts to count down and after a predetermined number of speeds, for example 100, 200, 500; likewise, it automatically turns off the power supply to the winding of the solenoid 80. so that the spring 76 immediately moves the slide 73 to the position shown in Figure 4 and subtracts the delivery amount for the set number of turns, i.e. for a certain number of strokes. reading the delivery ee monsoon 5 empties by turning the drain The valve 81 is stopped by the hand lever 811 and by pressing on the third button 213, the electric motor 2 stops. After emptying the scale 5 · it closes ·

By pressing the button 212 and then pressing the button 22, the fuel supply is thwarted in the same way as the number of revolutions that have been run, but at the same time at which the engine speed is light.

In order to verify the operation of the discharge valves 16 in series production, the individual discharge valves 16 are inserted sequentially into the injection unit 1, and the above-mentioned procedure measures the delivery at dual speed, whose size in both cases must not exceed the permitted tolerance pellets for the measured type of discharge valves 10 *.

When verifying the operation of the injection molding nozzles 71 in the batch production, they install the individual injection nozzles sequentially in the injector 2 and perform the same measurement and observe that the supply size at both mentioned engine speeds does not deviate from the tolerance field given for the type of injection nozzle being measured.

Analogously, other components of the injection molding device, such as discharge valve springs, injector springs, throats, injector ducts and the like can be inspected.

The evaluation of the injection device in the above-mentioned manner eo is carried out with conditions very close to the actual operation, which is a major advantage, guarantees an objective assessment ·

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Components that meet the measurement conditions described above guarantee a more accurate injection molding kit and thus a higher quality, while simultaneously improving engine parameters.

Claims (2)

THE INVENTION 1 · Units for quality control of injection molding units for diesel engines, in particular for leaks and throughput of discharge valves and injection nozzles, consisting of injection units comprising the tested discharge valve and the injector comprising the tested injection nozzle * further from the fuel reservoir, low pressure filling circuit and electromotor According to the method of connection with electric power sources, to operate at two constant revolutions at the same height and connected by a coupling to the injection unit, connected by a discharge pipe with an injector, into a calming collector under which a glass scale is placed. collector (72), into which the injector (7), connected and through the discharge line (18) with the outlet neck (17) of the injection unit (1), and the glass scale (8) is connected, an adjustable slide (73) ), one outlet of which flows into the glass canteen (8) and the other outlet of the limiter, wherein the adjustable slide (73) is provided with a lever (74), the ends of which are connected with a spring (76) and via a rod (75) with a movable core ( 801) an electromagnet (80) connected to a speed counter (23) controlled by a button (22) · Apparatus according to claim 1, characterized in that the injection unit (1) has a piston (14) beneath its upper face provided with a surface peripheral groove (141), the upper edge of which is guided in parallel and the piston face (14), groove (141) It is connected by radial channel and ace channel and space above the piston (14) »