Instrument metering device based on magnetic field polarity perception

Abstract

The invention relates to the technical field of metering detection, in particular to an instrument metering device based on magnetic field polarity perception. The instrument metering device comprises a rotating part driven by fluid to rotate, a magneto-sensitive device and a magnetic field generating device, and the rotating part is connected with the magneto-sensitive device or the magnetic field generating device and drives the magneto-sensitive device or the magnetic field generating device to rotate on a device arrangement track; the magnetic field generating device at least comprises a magnetic pole pair. According to the instrument metering device, on the premise that high metering precision is guaranteed, metering action can be completed with a small device size, the application scene range is expanded, and better applicability is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of metrological detection, and particularly to an instrument metering device based on magnetic field polarity perception. Background Art

[0002] For traditional instrument metering, such as gas meter metering or water meter metering, optical sampling technology is mostly used because of its excellent anti-interference ability. However, ordinary optical sampling technology has the disadvantages of high complexity, high power consumption and low resolution. Generally, it can only achieve a metering resolution of 0.01 (m³) and cannot achieve higher metering accuracy. In order to perform more accurate measurements, in the prior art, magnetoresistive sampling is often used for metering, and its metering resolution is relatively high, generally up to 0.002 (m³). The high metering resolution makes the magnetoresistive sampling technology have significant advantages in occasions where high-precision metering is required.

[0003] In the existing magnetoresistive sampling technology, when the fluid to be metered flows through the instrument, it can drive the magnet assembly to rotate. At this time, a magnetic field sensing device is arranged at a specific position near the rotating magnet assembly to detect the presence or absence of a magnetic field through this magnetic field sensing device. When the magnet assembly moves to the position farthest from the magnetic field sensing device, the magnetic field intensity sensed by the sensing device reaches the relatively weakest level, and then a corresponding electrical signal is output; when the magnet assembly moves to the position closest to the magnetic field sensing device, the magnetic field intensity sensed by the sensing device reaches the relatively strongest level, and at this time another corresponding electrical signal is output; at this time, the processing unit can obtain the metering result by analyzing the change characteristics of the above two electrical signals in terms of quantity, timing 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, there are certain drawbacks. On the one hand, in order to meet the requirement of a relatively large relative distance range between the magnet assembly and the sensing device, so that the sensing device can clearly distinguish the different magnetic field intensities of the magnet assembly at the two extreme positions and ensure the acquisition accuracy of the two different electrical signals, a large activity space is required, which puts forward higher requirements for the hardware layout space, and then increases the volume of the instrument and the manufacturing cost; on the other hand, the existence of an external interference magnetic field will destroy the sensing accuracy of the sensing device, cause the electrical signal to be misidentified, and then result in serious metering errors. Summary of the Invention

[0005] The purpose of the present invention is to provide an instrument metering device based on magnetic field polarity perception, which can complete the metering action with a smaller device volume on the premise of ensuring high metering accuracy, and at the same time has better anti-interference ability and can be competent for various high-precision metering tasks.

[0006] In order to achieve the above purpose, the specific technical solutions adopted by the present invention are as follows: An instrument metering device based on magnetic field polarity perception, comprising a rotating component driven by a fluid to rotate, a magnetic sensor device, and a magnetic field generating device. The rotating component is connected to the magnetic sensor device or the magnetic field generating device and drives the magnetic sensor device or the magnetic field generating device to rotate on a device arrangement track. The magnetic field generating device includes at least one pair of magnetic poles.

[0007] Preferably in the present invention, the device arrangement track includes 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.

[0008] Preferably in the present invention, the magnetic field generating device includes n pairs of magnetic poles, and each pair of magnetic poles includes two magnetic poles with opposite polarities.

[0009] Preferably in the present invention, the 2n magnetic poles in one magnetic field generating device are evenly and alternately distributed, dividing the track plane of the device arrangement track into 2n fan-shaped magnetic pole induction areas, and the central angle of each fan-shaped magnetic pole induction area is α = 360° / (2n).

[0010] Preferably in the present invention, a reference positioning plane is mapped on the track plane of the device arrangement track. The reference positioning plane includes 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 fan-shaped magnetic pole induction area. Each first-level positioning sector includes m second-level positioning sectors, where m is the number of magnetic sensor devices arranged. The central angle of each second-level positioning sector is β = α` / m.

[0011] Preferably in the present invention, one circumferential direction of the reference positioning plane is selected as the positioning direction. According to the positioning direction, the m second-level positioning sectors included in each first-level positioning sector are sequentially marked as the first feature area to the mth feature area. The m magnetic sensor devices are fixedly arranged in the feature areas and fall on the device arrangement track. The feature area label numbers of the arranged magnetic sensor devices are all different.

[0012] Preferably in the present invention, the rotating component is connected to the magnetic field generating device and drives the magnetic field generating device to rotate on the second circular track. The magnetic field generating device includes two pairs of magnetic poles, dividing the track plane of the device arrangement track into four fan-shaped magnetic pole induction areas, and the central angle of each fan-shaped magnetic pole induction area is α = 90°. Two magnetic sensor devices are fixedly arranged on the first circular track, and the two magnetic sensor devices are located in two second-level positioning sectors with different feature area label numbers.

[0013] Preferably in the present invention, the magnetic sensor device fixedly arranged in each second-level positioning sector is located on the sector center line of the second-level positioning sector.

[0014] Preferably in the present invention, the magnetic sensor device and the outside of the magnetic field generating device are wrapped with a shielding layer, and the shielding layer is used to resist external magnetic interference.

[0015] Preferably in the present invention, this kind of instrument metering device further includes a processor that is electrically connected to all the magnetic sensor devices and is used to collect the detection signals sent by the magnetic sensor devices and perform metering.

[0016] In summary, the present invention has the following beneficial effects: 1. The magnetic sensor device can determine the magnetic field polarity at the current location. Since the rotating part will drive one of the magnetic sensor device or the magnetic field generating device to rotate, and the other part is fixedly arranged in a specific secondary positioning sector, the magnetic sensor device rotates relative to the magnetic field generating device on the device layout orbital plane. During this relative rotation, the magnetic sensor device can generate different detection signals according to different magnetic field polarities, and the processor can calculate the flow data based on these detection signals; in this process, the relative distance between the magnetic field generating device and the magnetic sensor device does not need to be set very large to obtain accurate metering data, greatly reducing the volume of the instrument device.

[0017] 2. According to the distribution of the magnetic pole pairs in the magnetic field generating device, the orbital plane of the device layout track is divided into regions. It is divided into multiple sector-shaped magnetic pole induction regions, which correspond to different magnetic field polarities that are evenly and alternately distributed in sequence; 2n primary positioning sectors are also mapped according to the 2n sector-shaped magnetic pole induction regions, and the primary positioning sectors are divided into m secondary positioning sectors in combination with the preset number of magnetic sensor devices, further precisely defining the layout partition and position of the magnetic sensor devices. Combining the selection rules of the characteristic region marker numbers, the angular relationship between the multiple magnetic sensor devices is defined. This angular relationship ensures that for any unit-degree rotation of the sector-shaped magnetic pole induction region relative to the magnetic sensor device, at least one magnetic sensor device can obtain a detection signal, so as to obtain continuous, complete and accurate metering data.

[0018] 3. A shielding layer for resisting external magnetic interference is wrapped outside the magnetic sensor device and the magnetic field generating device. Since the volume of this instrument metering device is small, less shielding layer can be used to complete the wrapping coverage, and it also reduces the extra weight brought by the additional shielding layer. Description of the Drawings

[0019] The drawings are only used to show the principles, implementation methods, applications, characteristics and effects of the specific implementation manners and other related contents of the present application, and should not be considered as a limitation to the present application.

[0020] Figure 1 It is a schematic structural diagram of this instrument metering device; Figure 2 Schematic diagram of the device layout form in Embodiment 5; Figure 3 Schematic diagram of the device layout form in Embodiment 7; Figure 4 Schematic diagram of the device layout form in Embodiment 8.

[0021] In the figure: magnetosensitive device 1, magnetic field generating device 2, device layout track 3, first circular track 31, second circular track 32. Specific implementation manners

[0022] The technical solutions of the embodiments of the present invention will be explained and described below with reference to the accompanying drawings of the embodiments of the present invention. However, the following embodiments are only the preferred embodiments of the present invention, not all of them. Based on the embodiments in the implementation manners, other embodiments obtained by those skilled in the art without creative efforts all fall within the protection scope of the present invention.

[0023] Terms such as "first", "second", etc. in the description, claims and the above-mentioned drawings of this specification are used to distinguish different objects, rather than to describe a specific order. In addition, the term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0024] As Figure 1 shown, this instrument metering device measures fluids based on the working principle of magnetic field polarity perception. The above-mentioned fluids include but are not limited to common gases or tap water, etc. When the fluid flows in the pipeline, it will drive the rotating components therein to rotate via the metering device. The specific implementation forms of the rotating components can be blade impellers, annular blade impellers, etc. There are reserved installation positions on them, and the magnetosensitive device 1 or the magnetic field generating device 2 can be fixed at the installation positions, so that the rotating components can drive one of them to rotate.

[0025] The magnetosensitive device 1 is the sensing component in the present invention, which can sense the magnetic field and distinguish the magnetic field polarity. In an instrument metering device, the number of magnetosensitive devices 1 can be one or multiple. The more the number, the higher the resolution accuracy of the device, but the corresponding data processing volume and economic cost will also increase. Therefore, in practical applications, a balance in quantity needs to be found.

[0026] The magnetic field generating device 2 is used to excite a magnetic field and includes at least one pair of magnetic poles, which can be implemented in the form of a permanent magnet or an electromagnet; each pair of magnetic poles includes two opposite magnetic poles, namely the N pole and the S pole. It should be emphasized that the "opposite" concept of the opposite magnetic poles in the present invention does not mean that the N pole and the S pole are distributed relative to the center along the spatial position, but refers to the opposite polarity; in fact, in some of the following embodiments, the two opposite magnetic poles of each pair of magnetic poles are both adjacent and spaced apart, rather than being symmetrically distributed in space.

[0027] Embodiment 1 The device arrangement track 3 includes a first circular track 31 and a second circular track 32, and both tracks are circular because the distances from each arrangement point on the circular track (circumference) to the center of the circle are equal, which is beneficial to reducing the separation distance between the magnetic sensor 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 internal and external distribution relationship between the magnetic sensor device 1 and the magnetic field generating device 2. One is that the magnetic sensor device 1 is arranged on the first circular track 31 (relatively inside), and the magnetic field generating device 2 is arranged on the second circular track 32 (relatively outside), as Figure 1 shown; the other is that the magnetic sensor device 1 is arranged on the second circular track 32 (relatively outside), and the magnetic field generating device 2 is arranged on the first circular track 31 (relatively inside), as Figure 2 shown. Since the present invention senses and identifies the rotating magnetic field excited by the magnetic field generating device 2 through the magnetic sensor device 1, the smaller separation distance between the two does not affect the judgment accuracy of the magnetic sensor 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 plane. Usually, the two track planes are spatially coincident, that is, located in the same plane, but in some special cases, the two track planes can also be coaxially parallel, because this does not affect the magnetic sensor device 1's identification of different polarities, but the distance between the two track planes cannot be too large, which may lead to a decrease in the induction sensitivity of the magnetic sensor device 1.

[0028] Embodiment 2 The magnetic field generating device 2 includes n magnetic pole pairs, and each magnetic pole pair includes two magnetic poles with opposite polarities, that is, the magnetic field generating device 2 includes 2n magnetic poles. Moreover, the 2n magnetic poles are evenly and alternately distributed, dividing the orbital plane of the device arrangement track 3 into 2n sector-shaped magnetic pole induction regions, and the central angle of each sector-shaped magnetic pole induction region is α = 360° / (2n). Since both orbits of the device arrangement track 3 are circular, on the premise of the uniform and alternate distribution of the 2n magnetic poles, the magnetic pole induction regions provided by each magnetic pole are all sector-shaped, and their respective central angles are equal, that is, α = 360° / (2n); the 2n magnetic poles divide the orbital plane of the device arrangement track 3 into 2n sector-shaped magnetic pole induction regions. Specifically, the divided orbital plane can be the orbital plane of the first circular track 31 or the orbital plane of the second circular track 32, which depends on which circular track the magnetic field generating device 2 is allocated and arranged on.

[0029] Embodiment 3 A reference positioning surface is mapped on the orbital plane of the device arrangement track 3. The reference positioning surface is a spatial fixed positioning concept similar to a coordinate axis. In the present invention, since the rotating component always drives either the magnetic sensor device 1 or the magnetic field generating device 2 to rotate, and the other is fixed in position, in order to determine the spatial distribution position of the fixed one on one of the circular tracks of the device arrangement track 3, the reference positioning surface is mapped. The reference positioning surface includes 2n first-level positioning sectors. It can be known that the number of first-level positioning sectors is 2n, which is the same as the number of sector-shaped magnetic pole induction regions, and its central angle α` is the same as the central angle α of the sector-shaped magnetic pole induction region, which makes the shapes of the respective sector-shaped magnetic pole induction regions and the respective first-level positioning sectors be in a similar relationship. Further, each first-level positioning sector includes m second-level positioning sectors, where m is the arrangement number of the magnetic sensor devices 1; the central angle of each second-level positioning sector is β = α` / m. It should be noted here that each first-level positioning sector includes m second-level positioning sectors, that is to say, a total of 2n·m second-level positioning sectors are included in a reference positioning surface. Here, m is numerically the arrangement number of the magnetic sensor devices 1 in a set of this instrument metering device.

[0030] Therefore, one circumferential direction of the reference positioning surface is selected as the positioning direction, and the m second-level positioning sectors respectively included in each first-level positioning sector are sequentially marked as the first feature region to the mth feature region according to the positioning direction.

[0031] For example, in a possible reference positioning surface, there are four primary positioning sectors. Set m = 3, that is, there are three secondary positioning sectors in each primary positioning sector. Select the clockwise circumferential direction of the reference positioning surface as the positioning direction, and sequentially label the three secondary positioning sectors included in each primary positioning sector as the first feature area β1 to the third feature area β3. Then, fix and arrange the three magnetosensitive devices 1 in the feature areas and on the device arrangement track 3 (specifically, it can be on the first circular track 31 or on the second circular track 32). It should be particularly noted that the feature area label numbers where the magnetosensitive devices 1 are arranged are all different. That is, the three magnetosensitive 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 certain magnetosensitive device 1 has been arranged in the first feature area s1 of one of the primary positioning sectors, the other two magnetosensitive devices 1 cannot be arranged in the first feature area s1 of the remaining primary positioning sectors and can only be arranged in the second feature area s2 or the third feature area s3. This is to ensure that for any unit-degree rotation of the sector-shaped magnetic pole induction area relative to the magnetosensitive device, at least one magnetosensitive device can obtain a detection signal, so as to obtain continuous, complete, and accurate measurement data; one unit degree is numerically equal to the central angle β of the secondary positioning sector. It can be seen that the more the number of magnetosensitive devices 1 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 more data processing volume.

[0032] Embodiment 4 Each magnetosensitive device 1 fixedly arranged in each secondary positioning sector is located on the sector center line of the secondary positioning sector; such an arrangement can make the central included angles formed between the magnetosensitive devices 1 be integer multiples of one unit degree, making the later calculation more convenient and conducive to improving the calculation accuracy.

[0033] Embodiment 5 As Figure 2 shown, the selected number of magnetosensitive devices 1 is three, and the magnetic field generating device 2 includes a magnetic pole pair. The two opposite magnetic poles in the magnetic pole pair are distributed relative to each other in space, dividing the track surface of the device arrangement track 3 into two sector-shaped magnetic pole induction areas, and the central angle of each sector-shaped magnetic pole induction area is α = 180°; at the same time, the reference positioning surface includes a total of two primary positioning sectors, the central angle α` of each primary positioning sector is 90°, and each primary positioning sector includes three secondary positioning sectors in the clockwise positioning direction; and one unit degree is the same as the central angle β of the secondary positioning sector, which is 60°; and the magnetosensitive device A is arranged in Figure 2On the sector center line of the second feature area s2 of the upper-middle part of the first-level positioning sector, the magnetic sensor device B is arranged on the sector center line of the first feature area s1 of the lower-middle part of the first-level positioning sector, and the magnetic sensor device C is arranged on Figure 2 the sector center line of the third feature area s3 of the lower-middle part of the first-level positioning sector; thus, the marked numbers of the feature areas where each magnetic sensor device 1 is arranged are all different, and the central included angles formed by each magnetic sensor device 1 are all twice the degree of a unit degree, that is, 120°; and the three magnetic sensor devices 1 all fall on the upper second circular orbit 32 and are fixed in position. In this embodiment, the rotating component is fixedly connected to the magnetic field generating device 2, driving a magnetic pole pair in the magnetic field generating device 2 to rotate on the first circular orbit 31.

[0034] Using A, B, and C to represent the three magnetic sensor devices 1, each magnetic sensor device 1 uses a high level 1 to represent sensing the relative magnetic pole N level, and a low level 0 to represent sensing the S level. Then, within any rotation period of the magnetic field generating device 2, the three magnetic sensor devices 1 generate a total of six detection signals, corresponding to six states respectively. The truth table corresponding to each state can be exemplified as shown in Table 1 below. Among them, switching between two adjacent states once represents that the volume of the measured fluid has increased by a measurement unit V.

[0035] When the magnetic field generating device 2 rotates, the rotating magnetic field will have different excitation effects on the three magnetic sensor devices 1. Assuming a clockwise rotation direction and rotating 60° each time, the state change sequence is state 1, state 2... state 5, state 6 in turn. Then, when rotating counterclockwise, the state change sequence is state 6, state 5... state 2, state 1 in turn.

[0036] Table 1 Statistical table of the states of magnetic sensor devices A, B, and C Embodiment 6 The difference from Embodiment 5 is that the number of magnetic sensor devices 1 is reduced to two, using A and C to represent the two magnetic sensor devices 1 respectively. This embodiment can simulate the scenario in Embodiment 1 where when the B magnetic sensor device 1 among the three magnetic sensor devices 1 of A, B, and C fails and is damaged, the remaining two magnetic sensor devices 1 can still ensure the normal metering function. Ignoring the B magnetic sensor device, the corresponding state statistical table is exemplified as shown in Table 2 below. Different from Table 1, state 1 and state 6 have the same state result, state 3 and state 4 have the same state result, and the volume increase of the fluid corresponding to the two state results is both 2V; while the volume increase of the fluid corresponding to state 2 and state 5 is still V (unchanged compared to Table 1), thus maintaining accurate metering.

[0037] Table 2 Statistical table of the states of magnetic sensor devices A and C Embodiment 7 AsFigure 3 As shown, the difference from Embodiment 6 is that the number of magnetosensitive devices 1 is two, and the magnetic field generating device 2 includes two magnetic pole pairs. The four opposite magnetic poles are evenly and alternately distributed in space, dividing the orbital plane of the device arrangement track 3 into four fan-shaped magnetic pole induction regions, and the central angle of each fan-shaped magnetic pole induction region is α = 90°; at the same time, the reference positioning surface altogether includes four first-level positioning sectors, the central angle of each first-level positioning sector is α` = 90°, and each first-level positioning sector includes two second-level positioning sectors in the clockwise positioning direction; and the degree of a unit is the same as the central angle degree β of the second-level positioning sector, which is 45°; and, the magnetosensitive device A is arranged on Figure 3 the sector center line of the second characteristic region s2 of one of the first-level positioning sectors, and the magnetosensitive device B is arranged on the sector center line of the first characteristic region s1 of another first-level positioning sector. Thus, the central angle formed by the magnetosensitive device A and the magnetosensitive device B is one time the degree of a unit, that is, 45°.

[0038] Embodiment 8 As Figure 4 shown, the difference from the above implementation is that the magnetosensitive device 1 is arranged on the upper first circular track 31 and fixed in position. In this implementation, the rotating component is fixedly connected to the magnetic field generating device 2, driving 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 and arranged on the outer ring track, and the magnetosensitive device 1 is fixedly arranged on the inner ring track. The four opposite magnetic poles are evenly and alternately distributed in space, dividing the orbital plane of the device arrangement track 3 into four fan-shaped magnetic pole induction regions, and the central angle of each fan-shaped magnetic pole induction region is α = 90°; at the same time, the reference positioning surface altogether includes four first-level positioning sectors, and the central angle of each first-level positioning sector is α` = 90°; each first-level positioning sector includes two second-level positioning sectors in the clockwise positioning direction; and the degree of a unit is the same as the central angle degree β of the second-level positioning sector, which is 45°; the magnetosensitive device A is arranged on Figure 4 the sector center line of the second characteristic region s2 of one of the first-level positioning sectors, and the magnetosensitive device B is arranged on the sector center line of the first characteristic region s1 of another first-level positioning sector. The central angle formed by the magnetosensitive device A and the magnetosensitive device B is three times the degree of a unit (45°), that is, 135°.

[0039] In the implementation manners described above, the rotating component is fixedly connected to the magnetic field generating device 2, driving the magnetic field generating device 2 to rotate on the first circular orbit 31 or the second circular orbit 32. In addition, it should be noted that, based on the claims of the present invention, the rotating component can also be fixedly connected to the magnetic sensor device 1, driving the magnetic sensor device 1 to rotate on the first circular orbit 31 or the second circular orbit 32. At this time, the relevant distribution rules regarding the magnetic sensor device 1 still apply, because the magnetic sensor device 1 and the magnetic field generating device 2 are always relatively rotating. Here, it can still be regarded that the position of the magnetic sensor device 1 is fixed and the magnetic field generating device 2 rotates relatively. Whether the rotating component is specifically fixedly connected to the magnetic sensor device 1 or the magnetic field generating device 2 is actually determined based on the spatial setting requirements of the actual product, the hardware parameter configuration, and the production material model, and all of them are applicable to the technical solution provided by the present invention.

[0040] It should be noted that in the present invention, both the outer sides of the magnetic sensor device 1 and the magnetic field generating device 2 are wrapped with a magnetic shielding layer, and the magnetic shielding layer 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 devices or apparatuses, and is usually made of materials with high magnetic permeability. Common types of magnetic shielding layers include, for example, a metal shielding layer made of ferromagnetic materials such as soft iron, silicon steel, permalloy, or a gas shielding layer formed by surrounding the device with gas materials such as nitrogen, argon, etc.

[0041] It should also be noted that this type of instrument metering device further includes a processor electrically connected to all magnetic sensor devices, which is used to collect the detection signals sent by the magnetic sensor devices and perform metering. The processor can be implemented using a single-chip microcomputer or a microprocessor MCU, and is used to collect the detection signals sent by the magnetic sensor devices and perform metering to calculate the flow rate of the measured gas or water body.

[0042] As described above, it is only the preferred embodiment disclosed in this application and the explanation of the applied technical principles. Those skilled in the art should understand that the protection scope involved in this disclosure is not limited to the technical solution formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, a technical solution formed by mutually replacing the above features with (but not limited to) technical features with similar functions disclosed in this disclosure.

[0043] In the above embodiments, the descriptions of each embodiment have their own emphases. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0044] The foregoing are only exemplary embodiments of the present disclosure, and thus cannot limit the scope of the present disclosure. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. Those skilled in the art will readily conceive of other embodiments of the present disclosure after considering the specification and practicing the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include known common knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

Claims

1. An instrument measuring device based on magnetic field polarity sensing, comprising a rotating part driven by a fluid, a magnetic sensitive device (1) and a magnetic field generating device (2), characterized in that: The rotating component is connected to 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.

2. The instrument measuring device based on magnetic field polarity perception according to claim 1 is 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. The instrument measuring device based on magnetic field polarity perception according to claim 2 is characterized in that: The magnetic field generating device (2) comprises n magnetic pole pairs, each of which comprises two magnetic poles with opposite polarities.

4. The instrument measuring device based on magnetic field polarity perception according to claim 3 is characterized in that: The 2n magnetic poles in a magnetic field generating device (2) are evenly and alternately distributed, and the track surface of the device arrangement track (3) is divided into 2n sector-shaped magnetic pole induction areas, and the central angle of each sector-shaped magnetic pole induction area is α=360° / (2n).

5. The instrument measuring device based on magnetic field polarity perception according to claim 4 is characterized in that: The track surface of the device arrangement track (3) is mapped with a reference positioning surface, and the reference positioning surface contains 2n primary positioning sectors; the center angle α' of the primary positioning sector is the same as the center angle α of the sector-shaped magnetic pole sensing area; each of the primary positioning sectors contains m secondary positioning sectors, wherein m is the number of the magnetic sensitive devices (1) arranged; and the center angle of each secondary positioning sector is β=α` / m.

6. The instrument measuring device based on magnetic field polarity perception according to claim 5, characterized in that: Selecting one of the circumferential directions of the reference positioning surface as the positioning direction, and marking the m secondary positioning sectors respectively contained in each of the primary positioning sectors as the first characteristic area to the mth characteristic area in sequence according to the positioning direction; m magnetically sensitive devices (1) are fixedly arranged in the characteristic area and fall on the device arrangement track (3); the marking numbers of the characteristic areas where the magnetically sensitive devices (1) are arranged are all different.

7. The instrument measuring device based on magnetic field polarity perception according to claim 6, characterized in that: The rotating component is connected to 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, dividing the track surface of the device arrangement track (3) into four sector-shaped magnetic pole induction areas, and the central angle of each sector-shaped magnetic pole induction 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 secondary positioning sectors with different characteristic area marking numbers.

8. The instrument measuring device based on magnetic field polarity perception according to claim 6, characterized in that: The magnetic sensitive devices (1) fixedly arranged in each of the secondary positioning sectors are located on the sector center line of the secondary positioning sector.

9. The instrument measuring device based on magnetic field polarity perception according to claim 1 is characterized in that: The outer sides of the magnetic sensitive device (1) and the magnetic field generating device (2) are wrapped with a shielding layer, and the shielding layer is used to resist external magnetic interference.

10. An instrument measuring device based on magnetic field polarity perception according to any one of claims 1 to 9, characterized in that: The instrument measuring device also comprises a processor electrically connected to all the magnetic sensitive devices (1) and used for collecting the detection signals sent by the magnetic sensitive devices (1) and performing measurement.

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