RU174189U1 - NATURAL GAS CONSUMPTION METER OF A DIAGRAM TYPE WITH A CALCULATOR BASED ON MAGNETIC SENSORS - Google Patents

Abstract

The utility model relates to a magnetic coupling of a diaphragm type natural gas flow meter with a calculator based on magnetic sensors and is designed to measure the flow of natural gas. A magnetic coupling with permanent magnets and Hall effect sensors is used to transmit the torque of the membrane shaft to the meter. Up to four permanent magnets can be installed in the outer coupling half. The angular distance between the magnets is a multiple of 90 °. Hall sensors are located on the inner coupling half next to the inner wall of the sleeve. The angular distance between the Hall sensors is a multiple of 45 °. Hall sensors must be installed in such a way that at any position of the external coupling half in the magnetic field of its magnets there can be only one magnetic sensor at a time. The technical result is an increase in the service life of the calculator without replacing the battery. 3 ill.

Description

The utility model relates to measuring equipment, namely, metering devices for the consumption of natural gas diaphragm type, and can be used for the manufacture of diaphragm metering devices with an electronic reading device.

In engineering and literature, there are a significant number of analogues that use a magnetic coupling to transmit torque [880106X 01/17/1957 US; ROCKWELL MFG CO]. A similar principle has been used in liquid flow meters with a magnetic field sensor [09 / 564,181 04.05.2000 US; SCHLUMBERGER RESOURCE MANAGEMENT SERVICES, INC .; MURRAY, Kent; (US). BIANCHI, Timothy; (US). Hamilton, David; (US). BRENNAN, William, J., Jr .; (US). LOVETT, Jerry, W .; (US). CASTLEBERRY, Walter; (US)], [WO / 2012/101479; ISICOVICH, Shlomo, BEN-ENOSH, Erez, M.T.R. WIRELESS COMMUNICATIONS LTD .; ISICOVICH, Shlomo; BEN-ENOSH, Erez)], [RU 2131115 C1; Belobagin B.H., Loshnevsky G.M., Makarovets H.A., Rostovtsev V.I., Proskurin N.M., Roizen M.I., Sivtsov S.V., Chukov P.N .; State Scientific and Production Enterprise "Alloy"] and a liquid flowmeter with sealed magnetic contact [199,433 05/27/1988 US; MCCORMICK, DENNIS QUARVE, VERNON KIMBER, ROBERT A.].

As a prototype of a useful model, a diaphragm type meter with rotating magnets is used [08104321 06/09/2008 EP, GEORGE WILSON IND LTD, Wurtzler David], containing four permanent magnets installed in an internal coupling half (in the prototype - an assembly drum) connected to the drive shaft membrane mechanism. The Hall sensor is installed next to the sleeve wall in the inner coupling half (in the prototype, the drum sensor), so the device contains an outer coupling coupling with permanent magnets and an inner coupling coupling with a Hall sensor located on the outer and inner sides of the sleeve, respectively.

In known and used electronic diaphragm-type natural gas flow meters, the magnetic coupling consists of internal and external coupling halves, while the torque is transmitted by magnetic coupling of permanent magnets: annular in the outer coupling and cylindrical in the inner. In the metering devices on the market with an electronic calculator, an optical effect is used to record the rotation of the inner coupling half, the essence of which is to determine the position of the optical target (by clearance), which is rigidly fixed to the axis of the inner coupling half. Since the optical effect used assumes the presence of a radiation source and a photodetector, this method requires the energy of the power source to emit light, as well as the energy of the power source to amplify the output signal of the photodetector. Thus, the average value of the consumed current for a G6 class diaphragm meter with an optical sensor based on three optical pairs of emitter-receiver in a pulsed mode of operation is 25 μA (with a duty cycle of 0.0021% and a current of each pair of 4 mA). With this value of energy consumption, to ensure the full service life of the meter (10 years) without changing the power supply, a 2.2 Ah battery cell will be required, without taking into account the energy consumption for displaying information on the display and the operation of the processor of the calculator. At the same time, the capacity of installed batteries in natural gas consumption meters is from 1.2 A * h to 3.2 A * h. Taking into account the energy consumption for indication (10 μA) and processor calculations (20 μA), the required battery capacity increases to 4.8 A * h, which leads to the need to replace the battery within the service life and entails an increase in the cost of the supplying company to provide this procedures.

The utility model is designed to solve the problem of increasing the life of the computer without replacing the battery. The introduction of this model in production will reduce the power consumption of the calculator to an average value of 400 nA, while a battery with a capacity of 2.8 A * h will be sufficient to ensure continuous operation of the meter during the service life without replacing the battery.

The principle of operation of the utility model is to replace the sensitive element based on the optical effect with a sensitive element based on the Hall effect. In this case, the internal coupling half with an optical target is excluded from the design. A sensitive element detects the presence or absence of a magnetic field caused by the rotation of the magnet (s) of the external coupling half.

The magnetic coupling device contains an external coupling half 13 (Fig. 3), consisting of a sleeve 10 (Fig. 2), permanent magnets 8 and a mandrel 12. The external coupling coupling is mounted on the sleeve 17 (Fig. 3) from the inner side of the wall 16 of the meter housing. On the outer side of the housing wall, an inner half-sleeve is inserted into the sleeve, mounted on the PC board 14 with Hall sensors 15. The angular distance between the magnets of the outer half-coupler is a multiple of 90 °. The angular distance between the sensitivity axes of the Hall sensors of the inner half coupling is a multiple of 45 °, with an offset of 45 ° so that no one Hall sensor can be in any of the positions of the outer half coupling of the coupling in the magnetic field of its magnets.

Consider the device and operation of the claimed utility model. The figure 1 presents the proposed design of the magnetic coupling.

A magnetic coupling with a Hall-effect sensitive element consists of an internal coupling half 3 with a sensitive element (s) - Hall sensor (s) 4 and an external coupling half 1 with permanent magnets 5 separated by a metal sleeve 2 of the meter housing. The location of the Hall sensors depends on the design of the meter and can be any, subject to the following conditions:

1) the sensitivity axis of the sensors is perpendicular to the axis of rotation of the outer coupling half;

2) the sensor should be as far away as possible from the axis of rotation of the magnetic coupling half;

3) the sensor must be in the magnetic field of a permanent magnet passing above it during rotation of the external coupling half;

4) the angular distances between the magnets and the sensors must differ by at least 45 °.

The number of Hall sensors and magnets depends on the resolution requirements of the meter. When using one magnet and one Hall sensor, one pulse corresponds to the cyclic volume of the meter. When using two or more Hall sensors, the counting mechanism is able to detect the presence of an external magnetic field, since in normal operation modes the situation in which both Hall sensors are in the field of magnets is impossible.

In FIG. 2 shows the design of an external magnetic coupling half.

The clutch consists of a sleeve 10 with slots for magnets 11 and latches 9, mandrel 12 and neodymium magnets 8 (from one to four). When the latches 7 of the mandrel are latched, the magnets are fixed in the grooves of the sleeve, the flag 6 on the mandrel serves to engage with the membrane mechanism.

To increase the reliability of the sensitive element, a sensitive element based on a magnetic coupling with two Hall sensors located at an angle of 135 ° has been developed. This relative arrangement allows you to track the direction of rotation of the inner coupling half, as well as to monitor the presence of an external constant magnetic field, since under normal conditions all sensors cannot simultaneously be in the field of the coupling magnets.

Claims (1)

A magnetic coupling of a natural gas consumption meter with an electronic calculator and a Hall effect sensor, comprising an external magnetic coupling with permanent magnets installed in it and an internal coupling half with Hall effect sensors, characterized in that the rectangular coupling permanent magnets located in the external coupling are used at an angular distance multiple of 90 °, and Hall effect sensors located perpendicular to the axis of rotation of the outer coupling half with an angular distance multiple of 45 ° s by placing relatively permanent magnets of the outer coupling half.

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