RU195321U1 - The conversion unit into an electrical signal of the rotation parameters made in the form of an impeller of a measuring device element - Google Patents

Abstract

The utility model relates to devices for measuring parameters of fluid flows, including for measuring fluid flow, by passing a continuous stream through a measuring device in the cavity of which an element of the type of an impeller, driven by flow rotation, is installed, with subsequent conversion of the parameters of rotation of the impeller into an electrical signal . A block is proposed for converting into an electrical signal the rotation parameters of a measuring device element made in the form of an impeller, comprising a ring magnet (1 (11)) connected to the impeller and stationary Hall sensors (4 (16), 6 (18)) electrically connected to the control unit and calculations. Each Hall sensor (4 (16), 6 (18)) contains an additional pair of Hall sensors (5 (17), 7 (19)), with sensors (4-5 (16-17), 6-7 (18- 19)) Halls forming a pair are located in one perpendicular axis (10 (22)) of rotation of the impeller of the plane with the possibility of synchronous passage through the zones of paired north (N1 (N2, N3, N4)) and south S1 ((S2, S3, S4 )) of the poles defining one pole portion (2, 3 (12, 13, 14, 15)) of the ring magnet (1 (11)). Each pair of Hall sensors (4-5 (16-17), 6-7 (18-19)) is made with the possibility of independent electrical communication with the control and calculation unit. 3 s.p. f-ly, 2 ill.

Description

The utility model relates to devices for measuring the parameters of fluid flows, including for measuring fluid flow, by passing a continuous flow through a measuring device in the cavity of which an element of the type of an impeller, driven by flow rotation, is installed, with subsequent conversion of the parameters of rotation of the impeller into an electrical signal . The utility model can find application in electromagnetic transducers of various measuring devices (flow metering devices), including water meters installed at various facilities in public water supply systems and for individual consumers in everyday life.

A known meter for accounting for water, including a sensor housing with inlet and outlet nozzles, an impeller mounted on an axis in the cavity of the housing, first and second magnets mounted in the upper part of the impeller diametrically relative to its axis, a control and calculation unit based on a microcontroller, a liquid crystal indicator, a power source, as well as a Hall sensor mounted on the outside of the water meter casing above the path of the magnets during rotation of the impeller [Patent No. 2333320 C1, publ. 10.27.2008]. The counter also contains a conversion factor optimization unit, a timer, a pulse power generation unit for the Hall sensor, a communication unit with a computer, the first input of the Hall sensor connected to a common bus of the meter’s electronic circuit for water metering, the second input of the Hall sensor connected to the output of the pulse power generation unit and the output of the Hall sensor is connected to the first input of the control and calculation unit based on the microcontroller. Among the shortcomings of such a counter, one can mention the presence of an external power source, for example, a household AC network, as well as poor protection of the counter from unauthorized exposure to an external electromagnetic field.

There is also known a counting device for water and gas flow meters, comprising a device for collecting information, an electronic device for converting the speed of the sensitive element into the number of passed past meter substances with a sensor power system, additionally equipped with a transmission coefficient optimization unit depending on the current flow rate, and an indication device [ Patent No. 2111115 C1, publ. May 27, 1999]. In the counting device, the information pickup device is made in the form of two installed through a diamagnetic partition at the same level diametrically relative to the axis of rotation of the magnet of the sensing element of the Hall sensors, the interaction surfaces of which are identical with the magnet of the sensing element, and the outputs of the sensors are combined. The sensors are electrically connected to the power system, which generates power pulses alternately to one of the Hall sensors on the command of the previous one. In this case, the display device is additionally equipped with a switching circuit only for a fixed reading time. Among the advantages of such a calculating device, the authors note reliability in handling and operation, increased sensitivity to low costs and low power consumption. At the same time, the counting device of the described design did not solve the issues of protection against unauthorized exposure to an external electromagnetic field, as well as improving the accuracy of measurement (converting the speed of the impeller to an electrical signal).

Also known is a device for measuring fluid flow with protection against unauthorized access, comprising a sensor housing having an inlet and an outlet, an impeller mounted on an axis in the cavity of the housing, at least one magnet mounted in the upper part of the impeller, and a counting device enclosed in the housing wherein the counting device contains an electromagnetic sensor interacting with the impeller magnet and connected to the computing device associated with the digital indicator, the power source [Pat t RU №156181 U1, publ. 11/10/2015]. The fluid flow measuring device comprises a non-volatile memory device, an electronic real-time timer, a wireless information transmission module, and an electromagnetic sensor located at a minimum distance from the impeller magnet through a diamagnetic partition contains at least two Hall sensors, the outputs of which are connected to the inputs of the computing device, the power inputs of the Hall sensors, computing device, non-volatile memory device, electronic timer are connected to the output of power supply

Also known is an electrical measuring device for fluid flows, which comprises a housing with inlet and outlet nozzles, through which a fluid can flow, for example a liquid, an element made in the form of an impeller, mounted in the cavity of the housing on the axis with the possibility of rotation under the action of the flow passing through the cavity liquid, and forming a block of conversion into an electrical signal of the parameters of the rotation of the impeller, a rotating magnet and Hall sensors [Patent EP No. 2383547 B1, publ. 03/22/2017]. Hall sensors are located in the zone of passage of the magnet in one perpendicular axis of rotation of the impeller of the plane, at the same distance from the axis of rotation of the impeller and offset relative to each other by an angle α in the direction of rotation, where 0 ° <α <180 °. According to the authors, such an electrical meter allows a reliable and tamper-resistant electronic assessment, and at the same time it has a fairly simple and inexpensive design.

Formed in the framework of the described electrical measuring device, the block of conversion into an electrical signal of the parameters of rotation of the impeller according to the set of common technical features can be adopted as a prototype for the inventive block of conversion into an electrical signal of the parameters of rotation of the impeller.

According to the results of the analysis of the prior art, it should also be noted that the term “unit for converting rotation parameters made into the form of an impeller of elements” of various measuring devices used in the framework of the utility model is also referred to as “electromagnetic transducer”, “counting device”, etc. All devices of the prior art that are similar in design and function are thus considered, regardless of their name, to be analog devices.

The objective of the utility model is to create a unit for converting rotation parameters into an electrical signal of the made form of the impeller of an element of the measuring device, in particular, a water meter. Further, in the description text, for simplicity, the unit for converting the rotation parameters into an electric signal of the executed form of the impeller of the measuring device element will be referred to as the conversion unit.

The conversion unit and the measuring device containing it, in particular the water meter, should provide significantly higher (compared with other electronic meters) resistance to a powerful magnetic field, which increases protection against burglary by the action of permanent magnets (in addition to mechanical meters, they must provide complete protection against hacking through exposure to permanent magnets). In addition, the conversion unit and the measuring device containing it, in particular, a water meter, should provide an increase in the amplitude of the useful signal in the absence of a constant component, which greatly facilitates the digital processing of signals, and should also ensure that the temperature instability of the Hall sensors does not affect the measurement results.

The problem is solved, and the indicated technical results are achieved by the claimed unit of conversion into an electrical signal of the rotation parameters of the measuring device element made in the form of an impeller, comprising at least one impeller connected to the impeller, in particular, a magnetic field source made in the form of an annular a magnet with at least one pair of poles, and at least two stationary mounted magnetic field sensors made in the form of electrically connected Hall sensors and control unit, and Hall sensors are located in the zone of passage of the magnet in one perpendicular axis of rotation of the impeller of the plane, at the same distance from the axis of rotation of the impeller and offset relative to each other by an angle α in the direction of rotation, where 0 ° <α <180 °. The problem is solved, and the indicated technical results are achieved due to the fact that the claimed conversion unit for each Hall sensor contains an additional paired Hall sensor, while the Hall sensors forming a pair are located in one perpendicular axis of rotation of the impeller of the plane with the possibility of synchronous passage through the zones of the paired the north and south poles defining one pole portion of the ring magnet. Moreover, each pair of Hall sensors is made with the possibility of independent electrical communication with the control and calculation unit.

In the inventive conversion unit, in fact, a differential circuit is used to read signals (revolutions) from a magnet based on a Hall sensor. If the traditional circuit is a circuit in which, for example, two Hall sensors are installed with respect to the poles of the magnet in such a way that the revolution is read at one moment in time from only one sensor, then the differential sensors used in the construction of the claimed unit of conversion of the differential circuit are installed in pairs, so that at one point in time, two Hall sensors from the same pair are located in the areas of opposite poles (north-south) of the pole portion of the magnet, and, thereby, reading the signal (turnover) is carried out simultaneously with two Hall sensors. In this case, the signal to be further processed is doubled and the best signal-to-noise ratio is achieved. The use of a differential circuit provides a very high resistance to unauthorized exposure to a strong magnetic field, which increases protection against burglary through exposure to permanent magnets.

In preferred embodiments of the inventive conversion unit, the paired Hall sensors are located relative to each other at an angle β = 360 ° / n, where n is the number of pairs of magnet poles.

Also preferred are implementation forms of the inventive conversion unit, in which the angle α = 45 °.

In preferred embodiments of the inventive unit, each pair of Hall sensors is capable of independent electrical communication with a separate analog-to-digital converter included in the control and calculation unit.

The advantages and benefits of the claimed utility model will be further discussed in more detail on some preferred, but not limiting the scope of claims, examples of implementation forms of the conversion unit with links to the positions of the figures of the drawings, which are schematically represented:

FIG. 1 - conversion unit with an annular magnet formed by two pole sections;

FIG. 2 is a conversion unit with an annular magnet formed by four pole sections.

In FIG. 1 schematically shows a conversion unit with an annular magnet 1 formed by two pole sections 2 (poles N1, S1) and 3 (poles N2, S2). The ring magnet 1 is connected to the impeller, in particular mounted on the impeller of the measuring device. To simplify and in connection with the knowledge of specialists in the art of possible connections of the impeller with an annular magnet, the impeller and other structural elements of the measuring device that are not part of the conversion unit are not shown in the drawings. The conversion unit also contains two pairs of permanently installed Hall sensors 4-5 and 6-7. The pairs of Hall sensors 4-5 and 6-7 are capable of independent electrical communication with the control and calculation unit (not shown in the drawings) by means of the control unit and calculation of the corresponding separate analog-to-digital converter 8 or 9.

All Hall sensors 4-5 and 6-7 are located in the zone of passage of magnet 1 in one perpendicular axis 10 of rotation of the impeller of the plane, at the same distance from axis 10 of rotation of the impeller. Hall sensors 4 and 6, which are part of various pairs, are located offset from each other by an angle α in the direction of rotation (indicated by an arrow). Sensors 4 and 5, as well as Hall 6 and 7, which are part of one pair, are located in one perpendicular axis 10 of rotation of the impeller of the plane with the possibility of synchronous passage through the zones of paired north N1 (N2) and south S1 (S2) poles that define one pole section 2 (3) of the ring magnet 1.

In the embodiment of FIG. 1 of the implementation form, the paired sensors 4 and 5, as well as 6 and 7 of the Hall are located relative to each other at an angle β = 180 ° (n is the number of pairs of magnet poles equal to two).

In the embodiment of FIG. 1 of the implementation form, the angle α between the Hall sensors 4 and 6, which are part of various pairs, is 90 °.

In FIG. 2 schematically shows a conversion unit with an annular magnet 11 formed by four pole sections 12 (poles N1, S1), 13 (poles N2, S2), 14 (poles N3, S3), 15 (poles N4, S4). The ring magnet 11 is connected to the impeller, in particular mounted on the impeller of the measuring device. As in the implementation form discussed above, to simplify and in connection with the knowledge of specialists in the art of possible connections of the impeller with a ring magnet, the impeller and other structural elements of the measuring device that are not part of the conversion unit are not shown in the drawings. The conversion unit also contains two pairs of permanently installed Hall sensors 16-17 and 18-19. The pairs of Hall sensors 16-17 and 18-19 are made with the possibility of independent electrical communication with the control and calculation unit (not shown in the drawings) by means of the control unit and calculation of the corresponding separate analog-to-digital converter 20 or 21.

All Hall sensors 16-17 and 18-19 are located in the zone of passage of the magnet 11 in one perpendicular axis 22 of rotation of the impeller of the plane, at the same distance from the axis of rotation of the impeller 22. Hall sensors 16 and 18, which are part of different pairs, are offset relative to each other by an angle α in the direction of rotation (indicated by an arrow). Hall sensors 16 and 17, as well as 18 and 19, which are part of one pair, are located in one plane perpendicular to the axis of rotation of the impeller with the possibility of synchronous passage through the zones of paired northern N1 (N2, N3, N4) and southern S1 (S2, S3, S4) poles defining one pole portion 12 (13, 14, 15) of the ring magnet 11.

In the embodiment of FIG. In the implementation form, paired Hall sensors 16 and 17, as well as Hall 18 and 19 are located relative to each other at an angle β = 90 ° (n is the number of pairs of magnet poles equal to four).

In the embodiment of FIG. 2 of the implementation form, the angle α between the Hall sensors 4 and 6, which are part of various pairs, is 45 °.

It should be obvious to those skilled in the art that other forms of implementation are possible with a different number of Hall sensor pairs, a different number and arrangement of pole sections, different angles α (0 <α <180 °), etc.

It should also be obvious to those skilled in the art that the conversion unit of the claimed design can be integrated into the composition of measuring devices, in particular water meters, of any suitable design. In this regard, the design of the measuring device, in particular the water meter, in the framework of this description will not be considered in detail using additional graphic materials.

The inventive unit conversion into an electrical signal of the rotation parameters made in the form of an impeller element of the measuring device in the measuring device, in particular a water meter, operates as follows.

Through the inlet pipe of the housing of the measuring device, a fluid, in particular water, enters the cavity of the housing and, flowing through it, exits through the outlet pipe. When moving in the cavity from the inlet to the outlet pipe, the water rotates the impeller mounted in the housing cavity on the axis (corresponding to the rotation axis 10 (22)) with the possibility of free rotation (for example, on bearings) under the action of a flow of water passing through the cavity. An annular magnet 1 (11) is mounted on the impeller, which is rotated synchronously with the impeller itself. Pairs of Hall sensors 4-5 and 6-7 (16-17 and 18-19) relative to the impeller are installed stationary and together with the ring magnet 1 (11) form a block for converting rotation parameters into an electrical signal of a measuring device element made in the form of an impeller. Hall sensors are located in the zone of passage of magnet 1 (11) in one perpendicular axis 10 (22) of rotation of the impeller of the plane, at the same distance from axis 10 (22) of rotation of the impeller. Moreover, Hall sensors 4 (16) and 6 (18), which are part of various pairs, are traditionally, as in the conversion units of the prior art, positioned offset relative to each other by an angle α in the direction of rotation (indicated by an arrow) and allow read ”each impeller revolution twice at different points in time (the north pole N1 (N2, N3, N4) of the ring magnet will“ pass ”during one revolution of the impeller through the installation area of unpaired Hall sensors 4 (16) and 6 (18) at different times time). But, unlike the conversion units of the prior art, unpaired Hall sensors 4 (16) and 6 (18) are independently electrically connected to individual separate analog-to-digital converters 8 (20) or 9 (21) included in the control and calculation unit, which ensures the independence of the "calculation" of the impeller speed and digital processing of the corresponding analog signal. In this case, the paired (included in the same pair) sensors 4 (16) and 5 (17), as well as 6 (18) and 7 (19) Halls allow you to "read" each revolution of the impeller simultaneously from opposite poles N1 (N2, N3, N4) and S1 (S2, S3, S4) of one pole portion 2 or 3 (12 or 13, or 14, or 15) of the ring magnet 1, said pair sensors being electrically connected to one analog-to-digital converter 8 (20) or 9 (21). Thanks to the design features of the claimed conversion unit described above, all the above technical results are achieved, including:

- doubling the signal (increase in the amplitude of the useful signal by 2 times),

- the best signal to noise ratio,

- significantly higher resistance to unauthorized exposure to a magnetic field, which increases protection against hacking through exposure to permanent magnets.

As part of the measuring device, in particular the water meter, the signals received from Hall sensors 4-5 and 6-7 (16-17 and 18-19) are converted into analog-to-digital converters 8 (20) and 9 (21) from the control unit and calculations based on the microcontroller in digital form, and target data determined on the basis of the data obtained from the conversion unit on the parameters of the impeller rotation can be displayed on a liquid crystal display and / or transmitted via a corresponding communication unit to a remote computer, in particular from a processing center authorized to collect and process this type of information.

Claims (4)

1. The unit of conversion into an electrical signal of rotation parameters of a measuring device element made in the form of an impeller, comprising at least one magnetic field source connected to the impeller, made in the form of an annular magnet (1 (11)), with at least one pair poles (N1 (N2, N3, N4), S1 (S2, S3, S4)), and at least two permanently installed magnetic field sensors made in the form of electrically connected to the control and calculation unit of the sensors (4 (16) , 6 (18)) of the Hall, and the sensors (4 (16), 6 (18)) of the Hall are located in zones e the passage of the magnet (1 (11)) in one perpendicular axis (10 (22)) of the rotation of the impeller of the plane, at the same distance from the axis (10 (22)) of the rotation of the impeller and offset relative to each other by an angle α in the direction of rotation, where 0 ° <α <180 °, characterized in that for each Hall sensor (4 (16), 6 (18)) contains an additional paired Hall sensor (5 (17), 7 (19)), while the sensors (4- 5 (16-17), 6-7 (18-19)) Halls forming a pair are located in one perpendicular axis (10 (22)) of rotation of the impeller of the plane with the possibility of synchronous passage through the zones of pair seeding single (N1 (N2, N3, N4)) and south S1 ((S2, S3, S4)) poles defining one pole section (2, 3 (12, 13, 14, 15)) of the ring magnet (1 (11) ), and each pair of Hall sensors (4-5 (16-17), 6-7 (18-19)) is made with the possibility of independent electrical communication with the control and calculation unit. 2. The block according to claim 1, characterized in that the paired Hall sensors (4-5 (16-17), 6-7 (18-19)) are located relative to each other at an angle β = 360 ° / n, where n is the number of pairs of magnet poles. 3. The block according to claim 1, characterized in that the angle α = 45 °. 4. Block according to any one of paragraphs. 1-3, characterized in that each pair of Hall sensors (4-5 (16-17), 6-7 (18-19)) is made with the possibility of independent electrical communication with a separate analog-to-digital converter included in the control and calculation unit (8 (20), 9 (21)).

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