SU1749532A1 - Fuel system of bed for testing diesel engines - Google Patents

Abstract

Usage: engine-building, in particular the test of diesel fuel injection equipment. SUMMARY OF THE INVENTION: The stand fuel system comprises a supply tank 1, coarse and fine filters. A fuel priming pump is installed between the supply tank 1 and the measuring vessel 4. A vertically located measuring vessel 4 is placed parallel to the supply tank 1. A hydrostatic pressure sensor 9 is installed in the internal cavity of the measuring vessel at its lower end. Measuring vessel is made with the ratio of height to internal diameter of more than 8. 1 Cp f-ly, 1 ill. From diesel Ј Kdzseln) a O ate O) y

Description

The invention relates to the field of testing internal combustion engines, in particular to the fuel systems of test benches of diesel diesel engines, and can be used in the design of stands for testing units of heat and power plants and other types of heat engines.

The fuel systems of test benches for testing internal combustion engines are known, comprising a fuel tank, a supply line, a measuring tank installed on the scales, and connected by fuel lines to a fuel tank and supply line, cranes, a measuring and control unit and a time interval recorder.

The disadvantages of the well-known fuel stand systems are complex structures and low manufacturability, associated with the use of link weights and the need to connect a movable measuring tank with a supply line.

In addition to this, the well-known stand-up fuel systems do not allow testing the ICE with open fuel systems when only part of the fuel enters the engine and another part of the fuel returns to the fuel tank via the drain line. Known fuel systems also do not meet the requirements of fire safety,

A known fuel system is c / rei dp of testing an internal combustion engine comprising a fuel tank, supply and drain lines, a measuring tank mounted on the scales and connected by fuel lines to the supply and drain lines, taps, and a recorder.

The supply and drain lines are connected directly to the supply and drain lines of the tested internal combustion engine,

The disadvantages of the well-known fuel system of the stand are complex structures, low manufacturability and reliability, and, as a result, low accuracy of fuel consumption measurement. The disadvantages are due to the fact that the measuring capacitance is mounted on scales that are constantly in a loaded state and quickly go down. This requires frequent control calibrations of the scales and periodic repairs. The use of scales reduces the manufacturability and accuracy of fuel consumption measurement due to the influence of ambient conditions (vibrations, wind, temperature) on the reading of the scales.

The purpose of the inventions is to simplify the design and improve the manufacturability of measurements of mass fuel consumption, as well as

ease of use and operation of the stand.

The goal is achieved by the fact that in the fuel system of the stand containing the consumable

tank, coarse and fine filters, fuel pumping pump, measuring device with sensor and vertically arranged cylindrical measuring vessel communicated on one side with

0 with a supply tank, and on the other with a diesel engine fuel supply system, and connecting fuel lines with shut-off valves, the sensor of the measuring device is made as a hydrostatic pressure sensor and is installed in the inner cavity of a cylindrical measuring vessel on its lower end; the ratio of height to internal diameter is greater than 8. In addition, the fuel priming pump is installed in the connecting fuel line between the supply tank and the measuring vessel. e fuel system simplifies the construction of the stand,

5 improves the manufacturability and accuracy of measuring fuel consumption without disconnecting the fuel system of a diesel locomotive, and thus allows to simplify the design and improve the manufacturability of the measurement. This is achieved due to the fact that in the proposed technical solution, mass fuel consumption is measured using a hydrostatic measuring device with a pressure sensor installed in the inner belts of a measuring vessel cavity made in the form of a cylindrical pipe with a ratio of height to inner diameter greater than 8, and Not with the help of scales, as in the prototype.

0 In addition, the reliability of the fuel system of the test bench and measurement accuracy are improved, as the change in the hydrostatic pressure of the fuel in the measuring vessel is measured over a period of time.

5 with high accuracy.

The drawing shows a diagram of the proposed fuel system for testing diesel locomotives.

The proposed wall fuel system yes contains a supply tank 1, supplying 2 and discharge 3 lines connected to the supply and drain lines of the diesel diesel under test (not shown). Parallel to the consumable tank 1 is placed

5 is a vertically arranged cylindrical measuring vessel 4. The top of the measuring vessel 4 is connected by the fuel line 5 to the drain line 3, and the supply fuel line b and the overflow fuel line 7 to the fuel outlet from the boost pump 8 and the supply tank 1, respectively. At the lower end of the measuring vessel 4 in its inner part there is a hydrostatic pressure sensor 9 connected to a measuring device 10, the output of which is connected to the fuel control circuit of the boost pump 8. Taps 3 and supply 2 are fitted with taps (manual valves) 11-13 .

The lower end of the measuring vessel 4 through the valve 14 mounted on the fuel line 15, is connected to the feed line 3 of the locomotive. The entrance to the booster pump 8 is connected to the fuel supply pipe 16 with the supply tank 1. The measuring vessel 4 is cylindrical in shape with a ratio of height to internal diameter greater than 8.

. Fuel stand system works as follows.

The supply tank 1 is filled with fuel from the fuel storage (not shown). The taps 11 and 14 on the fuel lines 5 and 15 are set to the open position and with the help of the feed pump 8 through the supply fuel lines 16 and 6 the measuring vessel 4 is filled to the level H, where H is the height of the fuel column in the measuring vessel 4 from the axis of installation of the hydrostatic pressure sensor 9 to the free surface of the fuel. This liquid column creates a hydrostatic pressure P pg-H, where p is the fuel density, g is the acceleration of free fall. Before starting the diesel, taps 12 and 13 are closed on the fuel lines 3 and 2, respectively. When starting the diesel (not shown), the fuel line 15 runs through the open The valve 14 enters the supply line of the diesel diesel under test, passes through the coarse and fine filters and partially enters the cylinders of the diesel under test. The remaining part of the fuel is drained from the diesel through the open valve 11 and the fuel line 5 into the measuring vessel 4. Excess fuel from the measuring vessel 4 is poured into the supply tank 1 through the overflow fuel pipe 7. During operation of the diesel, the fuel level in the measuring vessel 4 decreases and reaches the upper marks.

At the same time, the hydrostatic pressure decreases and the measuring device 10 switches on a measure of time (not shown) by a signal from the sensor 9 of the hydrostatic pressure. The cycle for measuring fuel consumption begins (measurements of the generation of a given mass of fuel). As the fuel level develops (the hydrostatic pressure) continues to decrease, and when the lower level is reached | And the signal from the hydrostatic pressure sensor 9 causes the measuring device 10 to turn off the time meter and calculate the mass flow rate of fuel. Fuel level

5 continues to decrease and reaches the lower mark IV. At the same time, the measuring device 10, according to the signal from the transmitter, switches on the feed pump 8, which fills the measuring vessel 4. As the level increases

10, the fuel to the top mark I, the measuring device 1, according to a signal from the hydrostatic pressure sensor, shuts off the feed pump 8 and the stand is ready for a new measurement cycle. Fuel consumption

is by the formula B -. where K is constant

t

for a given range of levels II and III, the coefficient obtained from the results of technological adjustment, g-time generation

0 fixed mass of fuel. The total reduced error of fuel consumption measurement based on the calibration results does not exceed 1-1.5%. To improve the accuracy of fuel consumption measurement, it is advisable

5, as a hydrostatic pressure meter, use a Sapfner-22 DN type sensor with a basic reduced measurement error of 0.25%. Application of the proposed stand fuel system

0 simplifies its design and manufacturing cost by eliminating unreliable and costly scales from the design, improves the manufacturability of the measurement of fuel consumption, and enables automation of the measurement process.

When you turn off the measuring device of the stand from the diesel diesel fuel system, open taps 12 and 13 on line x-3 and 2, close taps 11

0 and 14 on the fuel lines 5 and 15. In this case, the fuel from the supply tank 1 enters the diesel fuel system through the supply line 2 and is discharged into the supply tank 1 via the drain line 3.

5 After that, the measuring device 10 With the sensor 9 and the measuring vessel 4 can be disconnected from the diesel diesel fuel system,

Claims (1)

0 claims Fuel test bench system for diesel diesel engines containing a supply tank, coarse and fine filters, a fuel priming pump, measuring device with a sensor and a vertically arranged cylindrical measuring vessel communicated on the one side with the supply tank, and on the other, with the fuel injection system of a diesel engine and connecting fuel lines with 7 17495328 shut-off-valve, about the end of it, and the measuring vessel is designed to be simplified with the ratio of height to internal No design, sensor measuring diameter more than 8, and fuel pumping The device is designed as a hydro-pump sensor and is installed in the connecting pressure of the pressure and is installed in a conduit between the supply tank and the inner cavity of the measuring vessel on the lower vessel.