RU104306U1 - FLOW METER - Google Patents

Abstract

 A flow meter comprising a measuring cylinder with inlet and outlet pipelines, a piston located inside the measuring cylinder, a piston left extreme position sensor, a piston right extreme position sensor, a countdown control unit whose input is connected to the output of said left and right piston extreme position sensors, characterized in that it contains a magnetic guide located along the lower outer surface of the measuring cylinder, and a metal carriage made with possible zhnosti move along the upper outer surface of the measuring cylinder, a piston mounted in the upper and lower magnets, which are arranged opposite one another, wherein the sensor is a left end position of the piston and a sensor of the right extreme working position of the piston based on the Hall effect.

Description

The utility model relates to the field of engine building and can be used to measure fuel consumption during engine tests when working on dimethyl ether or propane-butane mixtures.

A known flow meter containing a measuring cylinder with inlet and outlet pipelines, a piston located inside the measuring cylinder, a sensor of the left extreme position of the piston, a sensor of the right extreme position of the piston, a control unit for counting the time, the input of which is connected to the output from the said sensors of the left and right extreme positions piston (see utility model RU 1902, G01F 3/16, 03.16.1996).

The technical solution mentioned above has the following disadvantages:

- the error in fixing the position of the piston by the sensors of the extreme positions of the piston;

- lack of visual control over the movement of the piston;

- the ability to rotate the piston when moving inside the measuring cylinder.

The task to which the claimed utility model is directed is to create a flow meter without the above disadvantages.

The claimed utility model provides the following technical results:

- improving the accuracy of fixing (signaling) the position of the piston by the sensors of the extreme positions of the piston and, therefore, reducing the error in measuring the flow rate;

- ensuring reliability;

- providing visual control over the beginning and end of the fuel consumption measurement process.

The problem is solved by the fact that the flow meter contains a measuring cylinder with inlet and outlet pipelines, a piston located inside the measuring cylinder, a sensor of the left extreme position of the piston, a sensor of the right extreme position of the piston, a time counter control unit, the input of which is connected to the output of the said left sensors and the right extreme positions of the piston. The flow meter comprises a magnetic guide located along the lower outer surface of the measuring cylinder, and a metal carriage configured to move along the upper outer surface of the measuring cylinder, the upper and lower magnets are installed in the piston, which are located opposite each other, while the sensor of the left extreme position of the piston and the piston right extreme position sensor operate based on the Hall effect.

Improving the accuracy of fixing (signaling) by sensors of the extreme points of the piston position and ensuring reliability is achieved through the use of sensors based on the Hall effect, which respond directly to changes in magnetic flux from a magnet located in the upper part of the piston. The advantages of Hall-based sensors are the absence of mechanical moving parts and high speed (up to 100 kHz). Due to this, Hall sensors are highly reliable, durable and do not require physical contact with the measured medium.

The reliability of the flow meter is ensured by the installation of a lower magnet in the lower part of the piston and the location of a magnetic guide along the lower outer surface of the measuring cylinder. The lower magnet orientates the piston down to the magnetic guide, which minimizes the possibility of turning the piston when it moves inside the measuring cylinder.

Providing visual control during engine tests for the beginning and end of the fuel consumption measurement process is ensured by installing a metal carriage on the outer surface of the measuring cylinder, which moves after the piston equipped with a magnet from one extreme point to another.

The essence of the utility model is illustrated in the drawing.

The drawing shows a device for measuring flow.

The flow meter includes a measuring cylinder 1, a piston 2, an upper magnet 3, a lower magnet 4, a magnetic guide 5, a carriage 6, a sensor 7 of the left extreme position of the piston, a sensor 8 of the right extreme position of the piston, and a countdown control unit 9.

The measuring cylinder 1 is made of non-magnetic stainless steel, the piston 2 is made of fluoroplastic, and the carriage 6 is made of metal. The sensor 7 of the left extreme position of the piston and the sensor 8 of the right extreme position work on the basis of the Hall effect.

The countdown control unit 9 is equipped with a stopwatch, and the start button 10 and LED 11 are located on its front panel. The input of the countdown control unit 9 is connected to the output of the sensor 7 of the left extreme position of the piston and the sensor 8 of the right extreme position of the piston.

The piston 2 moves inside the measuring cylinder 1. A powerful upper magnet 3 is installed in the upper part of the piston 2. The lower magnet 4 is mounted opposite the upper magnet 3 in the lower part of the piston 2. The lower magnet 4 orientates the piston 2 down to the magnetic guide 5. Thus, the piston is held from turning inside the measuring cylinder.

The first solenoid valve 12 is located in the inlet pipe 16 of the flow meter, in communication with the left end of the measuring cylinder 1. The second solenoid valve 13 is located in communication with the right end of the measuring cylinder 1 in the pipe 15 supplying fuel to the engine. The countdown control unit 9 is connected to the first solenoid valve 12 and to the second solenoid valve 12.

The fuel pump 19 provides fuel from the fuel tank 20. The inlet of the pump 19 is connected to the supply pipe 16 by means of a pipe jumper 17 with a throttle 18. The output of the fuel pump 19 is connected to the pressure pipe 21, which is connected to the input ends of the fuel supply pipe 15 to the engine and the supply pipeline 16 flow meter.

Fuel is discharged from the measuring cylinder through the discharge pipe 22 with a transparent insert 14. By means of the transparent insert 14, visual monitoring of the absence of cavitation in the fuel flow is carried out.

The flow meter works as follows.

Before the start of the fuel consumption measurement cycle, the second solenoid valve 13 is open and fuel, for example dimethyl ether, is supplied from the tank 20 by the fuel pump 19 in series through the pressure pipe 21, pipe 15 and the discharge pipe 22 to the engine (not shown). In this case, the piston 2 is in the left extreme position.

When you press the start button 10, the first solenoid valve 12 opens, and the second solenoid valve 13 closes and the fuel consumption measurement cycle begins.

The fuel pump 19 delivers fuel through the pressure pipe 21 to the inlet pipe 16 of the flow meter and through it to the left side of the measuring cylinder 1. The piston 2 begins to move to the right, measuring the amount of fuel supplied to the engine. The measured volume of spent fuel when moving the piston 2 is pre-calibrated. When the piston moves away from the sensor 7 of the left extreme position of the piston, it sends a signal to the control unit of the countdown 9, in which the stopwatch is turned on and the countdown begins. When the piston 2 approaches the sensor 8 of the right extreme position of the piston, it sends a signal to the control unit 9 and the stopwatch stops, at the same time, the first solenoid valve 12 closes and the second solenoid valve 13 opens. The process of measuring the time spent measuring volume is completed. The fuel is again supplied by the fuel pump 19 to the engine through a second solenoid valve 13.

The piston returns to its original position due to the flow of fuel into the right side of the measuring cylinder through the fuel supply pipe 15 to the engine and leakage of fuel from the left side of the measuring cylinder 1 through the throttle 18 located in the pipe bridge 17 to the inlet of the fuel pump 19. When the piston 2 reaches the left extreme the position sensor 7 of the left extreme position of the piston generates an output signal supplied to the control unit of the countdown 9, and on the front panel of the control unit of the countdown 9 LED 11, indicating a state of readiness for the next measurement cycle.

During the fuel consumption measuring cycle, the movement of the piston 2 can be visually monitored by the carriage 6, which follows the piston along the outer surface of the measuring cylinder 1. The carriage 6 is magnetically connected with the piston 2 and, repeating its movement, moves to the right above the measuring cylinder 1.

Given the known measured volume of fuel and the measured time of movement of the piston between the sensor 7 of the left extreme position of the piston and the sensor 8 of the right extreme position of the piston, it is possible to calculate the fuel consumption entering the engine.

The claimed utility model provides a decrease in the error in measuring the flow rate and an increase in the reliability of the fuel consumption meter during engine tests when working on dimethyl ether or propane-butane mixtures.

Claims (1)

A flow meter comprising a measuring cylinder with inlet and outlet pipelines, a piston located inside the measuring cylinder, a piston left extreme position sensor, a piston right extreme position sensor, a countdown control unit whose input is connected to the output of said left and right piston extreme position sensors, characterized in that it contains a magnetic guide located along the lower outer surface of the measuring cylinder, and a metal carriage made with possible zhnosti move along the upper outer surface of the measuring cylinder, a piston mounted in the upper and lower magnets, which are arranged opposite one another, wherein the sensor is a left end position of the piston and a sensor of the right extreme working position of the piston based on the Hall effect.