An instrument metering device based on magnetic field polarity sensing

Abstract

The present application relates to the technical field of metrological detection, in particular to a kind of instrument metering device based on magnetic field polarity perception.The instrument metering device includes rotating component driven by fluid, magnetic sensitive device and magnetic field generating device, rotating component is connected with magnetic sensitive device or magnetic field generating device, and drives magnetic sensitive device or magnetic field generating device to rotate on device arrangement track;Magnetic field generating device at least includes one magnetic pole pair.This kind of instrument metering device can complete metering action under the premise of guaranteeing high metrological accuracy with smaller device volume, expands the range of application scene, has better applicability.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metrological detection, in particular to an instrument metering device based on magnetic field polarity sensing. BACKGROUND

[0002] Traditional instrument metering, such as gas metering or water metering, mostly uses optical sampling technology because of its excellent anti-interference ability; however, ordinary optical sampling technology has the disadvantages of high complexity, high power consumption and low resolution, and can only achieve a metering resolution of 0.01 (m3), which cannot realize higher metering accuracy. In order to measure more accurately, the existing technology often uses magnetic resistance sampling to meter, which has a higher metering resolution, generally up to 0.002 (m3). High metering resolution makes the magnetic resistance sampling technology have a significant advantage in occasions requiring high-precision metering.

[0003] In the existing magnetic resistance sampling technology, when the fluid to be metered flows through the instrument, the magnet assembly can be driven to rotate, at this time a magnetic field sensing device is arranged at a certain specific position near the rotating magnet assembly, the presence or absence of the magnetic field is detected through the magnetic field sensing device, when the magnet assembly moves to the position farthest from the magnetic field sensing device, the magnetic field strength sensed by the sensing device reaches the relatively weakest degree, and then an corresponding electric signal is output; when the magnet assembly moves to the position closest to the magnetic field sensing device, the magnetic field strength sensed by the sensing device reaches the relatively strongest degree, and another corresponding electric signal is output at this time; at this time, the processing unit can obtain the metering result by analyzing the change characteristics of the above two electric signals in quantity, time sequence and frequency.

[0004] Although the above metering method has high metering accuracy and can meet the application requirements of most high-precision metering occasions. However, it has certain disadvantages. On the one hand, in order to meet the requirement of a relatively large distance range between the magnet assembly and the sensing device, so that the sensing device can clearly distinguish the different magnetic field strengths of the magnet assembly at the two extreme positions, and ensure the accuracy of obtaining two different electric signals, a larger activity space is required, which raises higher requirements for hardware arrangement space, and thus increases the volume of the instrument and the manufacturing cost; on the other hand, the existence of external interference magnetic field can destroy the sensing accuracy of the sensing device, causing the electric signal to be misidentified, and thus serious metering errors occur. SUMMARY

[0005] The purpose of the present application is to provide an instrument metering device based on magnetic field polarity sensing, which can complete metering actions with a smaller device volume while ensuring high metering accuracy, and has better anti-interference performance and can perform various high-precision metering tasks.

[0006] In order to achieve the above purpose, the specific technical scheme adopted by the present application is as follows:

[0007] An instrument meter device based on magnetic field polarity sensing, comprising a rotating component driven to rotate by fluid, a magnetic sensitive device and a magnetic field generating device, the rotating component is connected with the magnetic sensitive device or the magnetic field generating device and drives the magnetic sensitive device or the magnetic field generating device to rotate on a device arrangement track; the magnetic field generating device contains at least one magnetic pole pair.

[0008] As a preferred embodiment of the present application, the device arrangement track contains a first circular track and a second circular track; the track diameter of the first circular track is smaller than the track diameter of the second circular track.

[0009] As a preferred embodiment of the present application, the magnetic field generating device contains n magnetic pole pairs, each of the magnetic pole pairs contains two magnetic poles with opposite polarity.

[0010] As a preferred embodiment of the present application, 2n magnetic poles in one of the magnetic field generating devices are uniformly and alternately distributed, dividing the track surface of the device arrangement track into 2n sector-shaped magnetic pole sensing areas, and the central angle of each of the sector-shaped magnetic pole sensing areas is α = 360° / (2n).

[0011] As a preferred embodiment of the present application, the track surface of the device arrangement track is mapped with a reference positioning surface, and the reference positioning surface contains 2n first-level positioning sectors; the central angle α` of the first-level positioning sector is the same as the central angle α of the sector-shaped magnetic pole sensing area; each of the first-level positioning sectors contains m second-level positioning sectors, where m is the arrangement number of the magnetic sensitive device; and the central angle of each of the second-level positioning sectors is β = α` / m.

[0012] As a preferred embodiment of the present application, one of the circumferential directions of the reference positioning surface is selected as a positioning direction, and m second-level positioning sectors contained in each of the first-level positioning sectors are sequentially marked as a first characteristic area to an mth characteristic area according to the positioning direction; m magnetic sensitive devices are fixedly arranged in the characteristic areas and fall on the device arrangement track; and the characteristic area mark numbers of the magnetic sensitive devices are all different.

[0013] As a preferred embodiment of the present application, the rotating component is connected with the magnetic field generating device and drives the magnetic field generating device to rotate on the second circular track; the magnetic field generating device contains two magnetic pole pairs, dividing the track surface of the device arrangement track into four sector-shaped magnetic pole sensing areas, and the central angle of each of the sector-shaped magnetic pole sensing areas is α = 90°; two magnetic sensitive devices are fixedly arranged on the first circular track, and the two magnetic sensitive devices are located in two second-level positioning sectors with different characteristic area mark numbers.

[0014] As a preferred embodiment of the present application, the magnetically sensitive device fixedly arranged in each secondary positioning sector is located on the sector center line of the secondary positioning sector.

[0015] As a preferred embodiment of the present application, the magnetically sensitive device and the magnetic field generating device are wrapped with a shielding layer for resisting external magnetic interference.

[0016] As a preferred embodiment of the present application, the instrument metering device further comprises a processor electrically connected with all the magnetically sensitive devices, for collecting the detection signals sent by the magnetically sensitive devices and performing metering.

[0017] In summary, the present application has the following advantages:

[0018] 1. The magnetically sensitive device can determine the current magnetic field polarity. Since the rotating part drives one of the magnetically sensitive device or the magnetic field generating device to rotate, and the other part is fixedly arranged in a specific secondary positioning sector, the magnetically sensitive device rotates relative to the magnetic field generating device on the device arrangement track surface. During the relative rotation, the magnetically sensitive device can generate different detection signals according to different magnetic field polarities, and the processor can calculate the flow data according to the detection signals. In this process, the relative distance between the magnetic field generating device and the magnetically sensitive device does not need to be set very large to obtain accurate metering data, greatly reducing the size of the instrument device.

[0019] 2. According to the distribution of the magnetic pole pairs in the magnetic field generating device, the track surface of the device arrangement track is regionally divided. It is divided into a plurality of sector-shaped magnetic pole sensing areas, which correspond to different magnetic field polarities in turn. According to the 2n sector-shaped magnetic pole sensing areas, 2n primary positioning sectors are mapped, and the primary positioning sectors are divided into m secondary positioning sectors in combination with the preset number of magnetically sensitive devices, further accurately defining the arrangement and position of the magnetically sensitive devices, and defining the angle relationship between the plurality of magnetically sensitive devices in combination with the selection rule of the characteristic area marker. This angle relationship ensures that the sector-shaped magnetic pole sensing area rotates relative to the magnetically sensitive device by any unit degree, and at least one magnetically sensitive device can obtain a detection signal, so as to obtain continuous, complete and accurate metering data.

[0020] 3. The shielding layer for resisting external magnetic interference is wrapped outside the magnetically sensitive device and the magnetic field generating device. Since the volume of the present instrument metering device is small, the shielding layer can be wrapped and covered with less shielding layer, and the additional weight caused by the additional shielding layer is also reduced. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are only used to show the principles, implementation manners, applications, characteristics and effects of the specific embodiments of the present application and other related contents, and cannot be considered as limitations of the present application.

[0022] Figure 1 Fig. 1 is a structural schematic diagram of the present metering device;

[0023] Figure 2 Fig. 5 is a schematic diagram of the device arrangement form in Example 5;

[0024] Figure 3 Fig. 7 is a schematic diagram of the device arrangement form in Example 7;

[0025] Figure 4 Fig. 8 is a schematic diagram of the device arrangement form in Example 8.

[0026] In the figure: magnetic sensitive device 1, magnetic field generating device 2, device arrangement track 3, first circular track 31, second circular track 32. DETAILED DESCRIPTION

[0027] The technical solutions of the embodiments of the present application will be explained and described below in combination with the drawings of the embodiments of the present application. The following embodiments are only preferred embodiments of the present application, and are not all. Based on the embodiments in the embodiments, other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0028] The terms "first", "second", and the like in the specification and claims in the specification and the above drawings are used to distinguish different objects, and are not used to describe a specific order. In addition, the term "comprising" and any variation thereof is intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device.

[0029] As shown in Figure 1 The present metering device is based on the working principle of magnetic field polarity sensing to meter fluid, including but not limited to common gas or tap water, etc. When the fluid flows in the pipeline, it drives the rotating part in the metering device to rotate. The specific implementation form of the rotating part can be a blade impeller, an annular blade impeller, etc., which is provided with a mounting position. The mounting position can fix the magnetic sensitive device 1 or the magnetic field generating device 2, so that the rotating part can drive one of them to rotate.

[0030] The magnetic sensitive device 1 is a sensing component in the present application, which can sense the magnetic field and distinguish the magnetic field polarity. In one metering device, the number of magnetic sensitive devices 1 can be one or more. The more the number is, the higher the resolution accuracy of the device is, but the data processing amount and the economic cost will also increase accordingly. Therefore, in actual application, the number balance needs to be found.

[0031] The magnetic field generating device 2 is used to excite a magnetic field, which at least contains one magnetic pole pair, which can be realized in the form of permanent magnets or electromagnets; each magnetic pole pair contains two opposite magnetic poles, namely N pole and S pole, and it is emphasized that the "opposite" concept of the opposite magnetic poles in the present application does not mean that the N pole and the S pole are distributed along the center of the circle in the spatial position, but means that the polarity is opposite; in fact, in the following part of the embodiment, the two opposite magnetic poles of each magnetic pole pair are adjacent and spaced, rather than spatially symmetrical.

[0032] Embodiment 1

[0033] The device arrangement track 3 contains a first circular track 31 and a second circular track 32, both of which are circular, because the distance between each arrangement point on the circular track (circumference) and the center of the circle is equal, which is conducive to reducing the separation distance between the magnetic sensitive device 1 and the magnetic field generating device 2, thereby reducing the volume of the entire device. Based on this, it can be known that there are two cases for the relative inner-outer distribution relationship between the magnetic sensitive device 1 and the magnetic field generating device 2, one is that the magnetic sensitive device 1 is arranged on the first circular track 31 (relative inner side), and the magnetic field generating device 2 is arranged on the second circular track 32 (relative outer side), as shown in Figure 1 ; the second is that the magnetic sensitive device 1 is arranged on the second circular track 32 (relative outer side), and the magnetic field generating device 2 is arranged on the first circular track 31 (relative inner side), as shown in Figure 2 Since the present application is to induce and identify the rotating magnetic field excited by the magnetic field generating device 2 by the magnetic sensitive device 1, the smaller separation distance between the two will not affect the judgment accuracy of the magnetic sensitive device 1. It should be noted that the track diameter of the first circular track 31 is smaller than that of the second circular track 32, which makes the second circular track 32 always in the outer ring position; and each of the two circular tracks naturally forms a track surface, and usually the two track surfaces are spatially coincident, that is, in the same plane, but in some special cases, the two track surfaces can also be coaxially and parallelly distributed, because this does not affect the identification of the magnetic sensitive device 1 for different polarities, but the distance between the two track surfaces cannot be too large, which may cause the decline of the sensing sensitivity of the magnetic sensitive device 1.

[0034] Embodiment 2

[0035] The magnetic field generating device 2 comprises n pairs of magnetic poles, each pair of magnetic poles comprising two magnetic poles with opposite polarity, i.e. the magnetic field generating device 2 comprises 2n magnetic poles. Furthermore, the 2n magnetic poles are uniformly and alternately distributed, dividing the track surface of the device arrangement track 3 into 2n sector-shaped magnetic pole induction areas, each sector-shaped magnetic pole induction area having a central angle of a = 360° / (2n). Since both tracks of the device arrangement track 3 are circular, each magnetic pole provides a sector-shaped magnetic pole induction area with an equal central angle a = 360° / (2n) under the condition of uniform and alternate distribution. The 2n magnetic poles divide the track surface of the device arrangement track 3 into 2n sector-shaped magnetic pole induction areas, specifically, the divided track surface can be the track surface of the first circular track 31 or the track surface of the second circular track 32, depending on which circular track the magnetic field generating device 2 is assigned to be arranged on.

[0036] Embodiment 3

[0037] The track surface of the device arrangement track 3 is mapped with a reference positioning surface. The reference positioning surface is a spatially fixed positioning concept similar to a coordinate axis. Since in the present application, the rotating component always drives one of the magnetic sensitive device 1 and the magnetic field generating device 2 to rotate, while the other one is fixed in position, in order to determine the spatial distribution position of the one that is fixed in position on one of the circular tracks of the device arrangement track 3, the reference positioning surface is mapped. The reference positioning surface comprises 2n first-level positioning sectors. It can be seen that the first-level positioning sectors are 2n in number, which is the same as the number of sector-shaped magnetic pole induction areas, and have the same central angle a` as the central angle a of the sector-shaped magnetic pole induction areas, which makes each sector-shaped magnetic pole induction area similar in shape to each first-level positioning sector. Further, each first-level positioning sector comprises m second-level positioning sectors, where m is the number of arrangements of the magnetic sensitive device 1; each second-level positioning sector has a central angle of β = a` / m. It should be noted here that each first-level positioning sector comprises m second-level positioning sectors, i.e. a reference positioning surface comprises 2n·m second-level positioning sectors. Here, m is the number of arrangements of the magnetic sensitive device 1 in a set of the present instrument measuring device.

[0038] Accordingly, one of the circumferential directions of the reference positioning surface is selected as the positioning direction, and m second-level positioning sectors contained in each first-level positioning sector are sequentially labeled as a first feature area to an mth feature area according to the positioning direction.

[0039] For example, in one possible reference positioning surface, there are four primary positioning sectors, and m=3 is set, meaning each primary positioning sector contains three secondary positioning sectors. The clockwise circumferential direction of the reference positioning surface is selected as the positioning direction. The three secondary positioning sectors contained in each primary positioning sector are sequentially labeled as first feature area β1 to third feature area β3. Then, three magnetically sensitive devices 1 are fixedly arranged in the feature areas and placed on the device arrangement track 3 (specifically, on the first circular track 31 or the second circular track 32). It is particularly important to note that the feature area labels for each magnetically sensitive device 1 are different. That is, the three magnetically sensitive devices 1 are respectively arranged in the first feature area s1, the second feature area s2, and the third feature area s3 of any four primary positioning sectors. For example, if a magnetic sensor 1 is already positioned in the first feature area s1 of one of the primary positioning sectors, then the other two magnetic sensors 1 cannot be positioned in the first feature area s1 of the remaining primary positioning sectors; they can only be positioned in the second feature area s2 or the third feature area s3. This is to ensure that at least one magnetic sensor can acquire a detection signal when the sector-shaped magnetic pole induction area rotates relative to the magnetic sensor by any unit degree, thereby obtaining continuous, complete, and accurate measurement data. One unit degree is numerically equal to the central angle β of the secondary positioning sector. Therefore, the more magnetic sensors 1 are arranged, the smaller the central angle β of the secondary positioning sector, the smaller the value of one unit degree, the higher the measurement accuracy, and the greater the data processing volume.

[0040] Example 4

[0041] The magnetic sensing devices 1, which are fixedly arranged in each secondary positioning sector, are all located on the sector center line of that secondary positioning sector. This arrangement ensures that the angle between the centers of the circles formed by each magnetic sensing device 1 is an integer multiple of one unit degree, making subsequent calculations more convenient and improving calculation accuracy.

[0042] Example 5

[0043] like Figure 2 As shown, three magnetic sensing devices 1 are selected, and the magnetic field generating device 2 includes a magnetic pole pair. The two opposing magnetic poles in the magnetic pole pair are spatially distributed, dividing the track surface of the device arrangement track 3 into two sector-shaped magnetic pole induction areas. The central angle of each sector-shaped magnetic pole induction area is α = 180°. At the same time, the reference positioning surface includes two primary positioning sectors, each with a central angle α' = 90°. Each primary positioning sector contains three secondary positioning sectors in the clockwise positioning direction. The unit degree is the same as the central angle β of the secondary positioning sector, which is 60°. Furthermore, the magnetic sensing device A is arranged on... Figure 2The magnetic sensitive device B is arranged on the sector center line of the second characteristic sector s2 of the upper half of the primary positioning sector, the magnetic sensitive device C is arranged on the sector center line of the first characteristic sector s1 of the lower half of the primary positioning sector, and the magnetic sensitive device A is arranged on the sector center line of the third characteristic sector s3 of the middle half of the primary positioning sector. Figure 2 The characteristic sector marks of the respective magnetic sensitive devices 1 are all different, and the included angle between the centers of the respective magnetic sensitive devices 1 is twice a unit degree, that is, 120°. The three magnetic sensitive devices 1 are all located on the second circular track 32 and fixed, and in this embodiment, the rotating part is fixedly connected with the magnetic field generating device 2, and drives one pair of magnetic poles in the magnetic field generating device 2 to rotate on the first circular track 31.

[0044] Using A, B and C to represent the three magnetic sensitive devices 1, using high level 1 to represent that the relative magnetic pole N is sensed, and using low level 0 to represent that the S is sensed, then in any one rotating period of the magnetic field generating device 2, the three magnetic sensitive devices 1 generate six detection signals in total, which correspond to six states respectively, and the truth table corresponding to each state can be shown in Table 1 as follows, wherein the switching of the adjacent two states once represents that the volume of the measured fluid is increased by one measurement unit V.

[0045] When the magnetic field generating device 2 rotates, the rotating magnetic field will produce different excitation effects on the three magnetic sensitive devices 1, and assuming that the rotating direction is clockwise, and the rotating angle is 60° each time, then the state change sequence is state 1, state 2, …, state 5, state 6 in turn, and when the rotating direction is counterclockwise, the state change sequence is state 6, state 5, …, state 2, state 1 in turn.

[0046] Table 1 State statistical table of A, B and C magnetic sensitive devices

[0047]

[0048] Embodiment 6

[0049] The difference from embodiment 5 is that the number of the magnetic sensitive devices 1 is reduced to two, and using A and C to represent the two magnetic sensitive devices 1, this embodiment can simulate the scenario that when the B magnetic sensitive device 1 among the three magnetic sensitive devices 1 in embodiment 1 is damaged, the remaining two magnetic sensitive devices 1 can still ensure the normal metering function. Ignoring the B magnetic sensitive device, at this time, the corresponding state statistical table is shown in Table 2 as follows, which is different from Table 1 in that state 1 and state 6 have the same state result, state 3 and state 4 have the same state result, and the volume of the fluid corresponding to the two state results is increased by 2V; and the volume of the fluid corresponding to state 2 and state 5 is still increased by V (unchanged compared with Table 1), so that the accurate metering is maintained.

[0050] Table 2 State statistical table of A and C magnetic sensitive devices

[0051]

[0052] Example 7

[0053] As Figure 3 shown, the difference from Example 6 is that the number of magnetic sensitive devices 1 is two, and the magnetic field generating device 2 contains two magnetic pole pairs, four opposite magnetic poles are uniformly and alternately distributed in space, dividing the track surface of the device arrangement track 3 into four sector-shaped magnetic pole sensing areas, and the central angle of each sector-shaped magnetic pole sensing area is α = 90°; at the same time, the reference positioning surface contains four first-level positioning sectors, and the central angle of each first-level positioning sector is α' = 90°, each first-level positioning sector contains two second-level positioning sectors in the clockwise positioning direction; and a unit degree is the same as the central angle of the second-level positioning sector β, which is 45°; and the magnetic sensitive device A is arranged on the sector center line of the second feature area s2 of one of the first-level positioning sectors, and the magnetic sensitive device B is arranged on the sector center line of the first feature area s1 of the other first-level positioning sector, so that the central angle of the magnetic sensitive device A and the magnetic sensitive device B formed with each other is one unit degree, that is, 45°. Figure 3

[0054] Example 8

[0055] As Figure 4 shown, the difference from the above implementation is that the magnetic sensitive device 1 is arranged on the first circular track 31 and fixed in position, and in this implementation, the rotating component is fixedly connected with the magnetic field generating device 2, and drives the two magnetic pole pairs in the magnetic field generating device 2 to rotate on the second circular track 32. In this embodiment, the two magnetic pole pairs of the magnetic field generating device 2 are distributed in a circular ring shape, arranged on the outer ring track, and the magnetic sensitive device 1 is fixedly arranged on the inner ring track. Four opposite magnetic poles are uniformly and alternately distributed in space, dividing the track surface of the device arrangement track 3 into four sector-shaped magnetic pole sensing areas, and the central angle of each sector-shaped magnetic pole sensing area is α = 90°; at the same time, the reference positioning surface contains four first-level positioning sectors, and the central angle of each first-level positioning sector is α' = 90°; each first-level positioning sector contains two second-level positioning sectors in the clockwise positioning direction; and a unit degree is the same as the central angle of the second-level positioning sector β, which is 45°; the magnetic sensitive device A is arranged on the sector center line of the second feature area s2 of one of the first-level positioning sectors, and the magnetic sensitive device B is arranged on the sector center line of the first feature area s1 of the other first-level positioning sector, so that the central angle of the magnetic sensitive device A and the magnetic sensitive device B formed with each other is one unit degree (45°), that is, 135°. Figure 4

[0056] ​​In the above implementation, the rotating part is fixedly connected with the magnetic field generating device 2 to drive the magnetic field generating device 2 to rotate on the first circular track 31 or the second circular track 32. In addition, it should be noted that, based on the claims of the present application, the rotating part can also be fixedly connected with the magnetic sensitive device 1 to drive the magnetic sensitive device 1 to rotate on the first circular track 31 or the second circular track 32. At this time, the relevant distribution rules related to the magnetic sensitive device 1 still apply because the magnetic sensitive device 1 and the magnetic field generating device 2 are always relatively rotated. Here, the position of the magnetic sensitive device 1 can still be regarded as fixed, and the magnetic field generating device 2 is relatively rotated. Whether the rotating part is fixedly connected with the magnetic sensitive device 1 or the magnetic field generating device 2 is determined by the actual space setting requirements of the product, the hardware parameter configuration, and the actual production material model, and all of them are applicable to the technical solutions provided by the present application.

[0057] It should be noted that in the present application, the outer sides of the magnetic sensitive device 1 and the magnetic field generating device 2 are wrapped with a magnetic shielding layer, which is used to resist external magnetic interference. The magnetic shielding layer is a layered structure used to reduce or prevent external magnetic fields from interfering with equipment or devices, usually made of materials with high magnetic permeability. Common types of magnetic shielding layers include, for example, metal shielding layers made of ferromagnetic materials such as soft iron, silicon steel, permalloy, etc., or gas shielding layers formed by surrounding the device outside with gas materials such as nitrogen, argon, etc.

[0058] It should also be noted that the instrument metering device also includes a processor electrically connected to all the magnetic sensitive devices for collecting detection signals sent by the magnetic sensitive devices and performing metering. The processor can be implemented using a single-chip microcomputer or a microprocessor MCU for collecting detection signals sent by the magnetic sensitive devices and performing metering to calculate the flow of the measured gas or water body.

[0059] The above description is only for the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the protection scope involved in the present disclosure is not limited to the technical solutions formed by the specific combination of the above technical features, and also covers other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the disclosed concept. For example, the above features can be replaced with technical features with similar functions disclosed in the present disclosure (but not limited to) to form technical solutions.

[0060] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the relevant description of other embodiments.

[0061] The above descriptions are merely some example embodiments of the present disclosure, and cannot limit the scope of the present disclosure. That is, equivalent changes and modifications made according to the teachings of the present disclosure are still within the scope of the present disclosure. Those skilled in the art will easily derive other embodiments of the present disclosure upon considering the specification and practicing the disclosure herein. The present application is intended to cover any variations, uses, or adaptive changes of the present disclosure following the general principles of the present disclosure and including common knowledge or conventional technical means in the art not described in the present disclosure. The specification and examples are merely considered as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. A magnetic field polarity sensing based metering device comprising a rotating member rotated by a fluid, a magnetic sensitive element (1) and a magnetic field generating means (2), characterized in that, The rotating component is connected with the magnetic sensitive device (1) or the magnetic field generating device (2) and drives the magnetic sensitive device (1) or the magnetic field generating device (2) to rotate on the device arrangement track (3); the magnetic field generating device (2) comprises at least one magnetic pole pair; 2n magnetic poles in one magnetic field generating device (2) are uniformly and alternately distributed, thereby dividing the track surface of the device arrangement track (3) into 2n sector-shaped magnetic pole sensing areas, and the central angle of each sector-shaped magnetic pole sensing area is α=360° / (2n); the track surface of the device arrangement track (3) is mapped with a reference positioning surface, and the reference positioning surface comprises 2n first-level positioning sectors; the central angle α` of the first-level positioning sector is the same as the central angle α of the sector-shaped magnetic pole sensing area; each first-level positioning sector comprises m second-level positioning sectors, wherein m is the arrangement number of the magnetic sensitive device (1); and the central angle of each second-level positioning sector is β=α` / m.

2. An instrument metering device based on magnetic field polarity sensing according to claim 1, characterized in that, The device arrangement track (3) comprises a first circular track (31) and a second circular track (32); the track diameter of the first circular track (31) is smaller than the track diameter of the second circular track (32).

3. An instrument measuring device based on magnetic field polarity sensing according to claim 2, characterized in that, The magnetic field generating device (2) comprises n magnetic pole pairs, and each magnetic pole pair comprises two magnetic poles with opposite polarities.

4. The instrument meter device based on magnetic field polarity sensing as claimed in claim 3, wherein, One of the circumferential directions of the reference positioning surface is selected as a positioning direction, and m second-level positioning sectors contained in each first-level positioning sector are sequentially marked as a first characteristic area to an mth characteristic area according to the positioning direction; m magnetic sensitive devices (1) are fixedly arranged in the characteristic areas and fall on the device arrangement track (3); the characteristic area mark numbers of the magnetic sensitive devices (1) are all different.

5. The instrument metering device based on magnetic field polarity sensing as claimed in claim 4, wherein, The rotating component is connected with the magnetic field generating device (2) and drives the magnetic field generating device (2) to rotate on the second circular track (32); the magnetic field generating device (2) comprises two magnetic pole pairs, thereby dividing the track surface of the device arrangement track (3) into four sector-shaped magnetic pole sensing areas, and the central angle of each sector-shaped magnetic pole sensing area is α=90°; two magnetic sensitive devices (1) are fixedly arranged on the first circular track (31), and the two magnetic sensitive devices (1) are located in two second-level positioning sectors with different characteristic area mark numbers.

6. The instrument meter device based on magnetic field polarity sensing of claim 5, wherein, The magnetic sensitive device (1) fixedly arranged in each second-level positioning sector is located on the sector center line of the second-level positioning sector.

7. A magnetic field polarity sensing based metering device as claimed in claim 1, wherein, The magnetic sensitive device (1) and the magnetic field generating device (2) are wrapped with a shielding layer, and the shielding layer is used for resisting external magnetic interference.

8. A magnetic field polarity sensing based metering device according to any one of claims 1 to 7, characterized in that, The instrument metering device further comprises a processor electrically connected with all the magnetic sensitive devices (1) and used for collecting detection signals sent by the magnetic sensitive devices (1) and performing metering.

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