SU235348A1 - DEVICE FOR MEASURING FLUID AND OIL DIESEL FLOW - Google Patents

Description

The invention relates to the field of instrumentation and is intended to measure fuel and oil consumption in diesel engine testing and testing; it can be used in the testing and study of gas turbines, compressors, gas generators, gasoline engines, etc.

Devices are known for measuring the fuel consumption of a volume and weight type. Weight flow measuring devices operate on the principle of direct weighing of a measuring tank on a scale. However, the accuracy of these devices is insufficient, and the equipment of the test bench is too cumbersome.

Improving the accuracy of measurement and simplification of bench equipment is achieved by the fact that the device consists of a rigidly mounted fuel tank with a float flooded in it, the weight of which is much less ejected, to its strength. In the submerged state, the float is held by a special valve on which the ejection force acts on one side and air pressure on the other. At the same time, the change in air pressure is proportional to the change in the buoyancy force, i.e. in proportion to the change in the weight of the fuel in the tank.

FIG. 1 shows the device, a general view; in fig. 2 is a diagram of its inclusion in the diesel fuel system.

The device SOST01GG from the supply tank /, in which the receiver 2 is rigidly mounted, fed through a jet 3 with-: fresh air. In the lower part of the receiver, a saddle 4 of a measuring valve is installed with a limiter of 5 of its stroke. A measuring valve 6 is located between the saddle 4 and the stopper 5. The receiver of the pulse tube 7 is connected to the pressure gauge 8. In parallel with the indicating pressure gauge, a self-recording secondary device can be connected instead, providing an automatic recording of the air pressure change in the receiver. The metering valve 6 is pressed against the seat 4 by a float .9. The float 9 is made in the form of a hollow cylinder, closed by a bottom with a load of 10 in its lower part, so that under the action of buoyancy it always takes up a strictly vertical position. In the upper part of the tank there is a receiving neck // with a fitting 12 for connecting the fuel supply line and with a transparent glass insert 13 indicating that there are no leakages of fuel (oil) during the measurement time. At the same level with the receiving mouth, the drainage neck 14 is made, which reduces the ioddsshrzhanie in the expendable m tank and the other level. The bottom of the supply tank through the triplex 15 and the pipeline 16 (see FPG. 2) is connected to the fuel system

diesel and pipe 17 to valve 18 for calibrating the pressure gauge.

The device works as follows.

Due to the fact that the device is located above the level of the most elevated point of the diesel fuel system, the fuel flows from the supply tank / into the diesel fuel system by gravity. During normal operation of the diesel (when no measurement is made), fuel from tank 19 is continuously pumped by pump 20 through valve 21 into the receiving neck 11. Partially fuel via the pipeline / 6 goes to the diesel, and partially is drained through neck 14 back into the tank 19. This ensures maintenance in the fuel tank / constant fuel level. In this case, a constant ejection force acts on the float.

 - p / -tp)

where P is the force acting on the float, Vo is the volume of the part of the float submerged in the fuel,

/ - the specific weight of the fuel, GTH - the weight of the float.

This force is sensed by the measuring valve 6. On the other hand, the measuring valve has an air pressure force equal to

CL - P CL,

where Rcl is the force of air pressure on the valve, RKL is the valve area, which perceives air pressure, P is the air pressure in the receiver.

If the buoyancy force P is greater than the YcL force, the valve closes and the pressure increases in the receiver due to flow through the air jet 3. When the air pressure on the valve is greater than the buoyancy force, the valve opens and the pressure in the receiver decreases.

When the air pressure and the force ejecting force float are equal, the valve is in equilibrium, and the air pressure in the receiver is kept constant. In order for the system to soon come to an equilibrium state and no oscillations arise in it, the valve stroke is limited by a limiter 5.

The weight of the float and the cross section of the valve are selected so that when the supply tank is fully filled, the air pressure in the receiver corresponds to the upper limit of measurement of the applied pressure gauge.

The fuel consumption is measured with the valve 21 closed. As the fuel (oil) is consumed, its level in the tank decreases, resulting in a decrease in the buoyancy force by

D I A / g. - /,

where D / g is the change in the fuel level in the tank

Changing the buoyant force by the value of Af causes the air pressure in the receiver to change by the amount of

l dr

Dr.

..,

On the other hand, a decrease in the level of fuel in the tank by an amount A / g corresponds to a change in its quantity in the tank by an amount

A C, A / g (GB - / - „) /,

where AST is the weight of the consumed fuel, F is the cross section of the fuel tank.

Hence the weight of fuel consumed from the tank, expressed in units of pressure, will be

D /.

l S, CL (/ - m)

If, at the same time, the number of Z divisions of the gauge scale is known, corresponding to a change in pressure per A / l price, one division,

expressed in kg1cm, will be.

The price of one division is determined by the preliminary calibration of the manometer. The taring of the device is performed by pouring into the tank before the weighted amount of fuel with high accuracy with the valve 18 closed and

engine off.

Measurement of fuel consumption by a diesel engine is reduced to determining the time spent on a certain weight of fuel on a gauge scale with the valves 21 and 18 closed.

Parallel to the pressure gauge or instead of it simultaneously with the closing of the valve 21, you can turn on the recording secondary device. As a result, the curve of the change in fuel consumption of a diesel engine in transient conditions is recorded or the stability of maintaining the diesel engine operation mode during the measurement of fuel consumption at a constant mode of operation is determined. For the use of standard secondary recording devices produced

It is convenient to use the air pressure at the inlet to the jet 3 on the order of 1.5-2 / cg / sg2, and the pressure measurement in the receiver 2 during the measurement in the range of 0.2-1 kg / cm. As a indicating pressure gauge, it is convenient to apply model pressure gauges to the same range of changes in air pressure in the receiver.

Subject invention

A device for measuring fuel and oil consumption, containing a supply tank, a float, a measuring device and a jet, characterized in that, in order to improve measurement accuracy and simplify bench equipment, the supply tank is equipped with a receiver, the measuring valve is installed in the lower part perceiving buoyancy force