SU85912A1 - Liquid flow meter - Google Patents

Description

The invention relates to a flow meter, for example, fuel consumption during engine testing.

Flowmeters are known for weighing fuel when testing engines, consisting of a weight tank, connected by flexible hoses to a pipeline and to a pressure tank and suspended from the weights, as well as electrical differentiation devices, consisting of a capacitor in series in the sensor circuit and parallel resistance .

However, the known liquid flow meters have the disadvantage that they do not provide the ability to determine both the average and the instantaneous flow rate without the use of clock mechanisms.

The described flow meter differs from the known flow meters of this kind by using electrical capacitive differentiating devices connected in a circuit between a rheostat scale sensor and an amplifier, with a pointing or recording device. This makes it possible to determine both the average and the instantaneous flow rate of a liquid without using clock mechanisms.

FIG. 1 shows a liquid flow meter; in fig. 2 and 3 - types of differentiating devices.

The fuel during the engine test flows through the fuel line and fills the measuring tank / and the weight tank 2 connected to the same line; the measuring tank 1 is fixed fixedly slightly above the weighing tank 2. Both tanks are connected to the fuel line according to the usual shtikhprobera scheme; when the engine is powered with fuel directly from the gas storage facility, the weight tank is filled with fuel, and the measuring tank is partially filled, so that the air pressure remaining in the upper part of the measuring tank balances the fuel head in the system. During measurement, electromagnet no. 85912-2 valve 3 is closed and fuel consumption starts from the weighing tank. The measured weight is balanced by a quadrant, which consists of a pipe counterweight 4, a load receiving cam 5 and a supporting axis 6 of the quadrant. An axis 6 is fitted with a slider moving along a rheostat sensor 7 mounted on a fixed quadrant arm.

The lifting cam 5 has a profile curve that ensures the proportionality of the angular displacements of the quadrant and the measured weight.

The action of the measuring device is based on the measurement of these movements using differentiating devices of two types (Fig. 2 and Fig. 3). A device is connected to a quadrant by means of switch 8.

The switching on and off of the differentiating devices in the process of measuring the fuel consumption is carried out by a relay device operating from the end contacts 9 and 10 located on the rheostat sensor.

The differentiating devices each have their own amplifier 11 and 12, where 14 is the electrical voltage at the input, 15 is the output voltage, 16 is the resistance. The device of the first type (Fig. 1) has in the system a recording galvanometer 13 with a profile scale, and a device of the second type, indicating a galvanometer 17, also with a profile scale.

Subject invention

A liquid mass flow meter, for example, fuel consumption during engine testing, consisting of a weight tank connected by flexible hoses to a pipeline and to a pressure tank and advised to weights, characterized in that, in order to determine both the average and the instantaneous flow rate in time , applied capacitive electrical differentiating devices included in the electrical circuit between the rheostatic sensor of the balance and the amplifier with electrical devices connected indicating or recording the fluid flow .