阅读说明：本技术 一种无磁计量装置、计量方法和流体计量设备 (Nonmagnetic metering device, metering method and fluid metering equipment ) 是由 朱林海 罗军 戴坡 孙标 于 2020-05-29 设计创作，主要内容包括：本发明涉及一种无磁计量装置、计量方法和流体计量设备。一种无磁计量装置,包括计量部和检测部；所述计量部包括三个或以上的初级线圈、与所述初级线圈数量相同的次级线圈、部分金属化圆盘以及穿过所述部分金属化圆盘中心的轴；单个所述次级线圈内置在单个所述初级线圈中,并同心、同平面装设,形成电感耦合的单一线圈组件；形成的三个或以上所述线圈组件绕所述轴同平面装设；所述检测部具有激励模块、检测模块和计量处理器；所述激励模块与所有的所述初级线圈分别连接,同时与所述计量处理器连接。本发明中,每一个初级线圈里面含有一个次级线圈,除去金属涡电流损耗剩余的能量基本被同心布置的次级线圈接收,提高了能量的利用率,误差小。(The invention relates to a non-magnetic metering device, a metering method and fluid metering equipment. A non-magnetic metering device comprises a metering part and a detection part; the metering portion comprises three or more primary coils, secondary coils with the same number as the primary coils, a partially metallized disk and a shaft passing through the center of the partially metallized disk; the single secondary coil is arranged in the single primary coil and is arranged concentrically and coplanar to form an inductively coupled single coil assembly; three or more coil assemblies formed are co-planarly mounted about the axis; the detection part is provided with an excitation module, a detection module and a metering processor; the excitation module is respectively connected with all the primary coils and is simultaneously connected with the metering processor. In the invention, each primary coil is internally provided with a secondary coil, and the energy left by removing the metal eddy current loss is basically received by the concentrically arranged secondary coils, so that the utilization rate of the energy is improved and the error is small.)

1. A nonmagnetic metering device is characterized by comprising a metering part and a detecting part;

the metering part comprises three or more primary coils, secondary coils with the same number as the primary coils, a partially metallized disk and a shaft arranged at the center of the partially metallized disk; the single secondary coil is arranged in the single primary coil and is arranged concentrically and coplanar to form an inductively coupled single coil assembly; three or more coil assemblies formed are co-planarly mounted about the axis;

the detection part is provided with an excitation module, a detection module and a metering processor; the excitation module is respectively connected with all the primary coils and is simultaneously connected with the metering processor; the detection module is respectively connected with all the stimulation coils and is simultaneously connected with the metering processor.

2. The nonmagnetic metering device of claim 1, wherein all of the secondary coils are connected in parallel with each other and then connected to the detection module, respectively.

3. The nonmagnetic metering device of claim 2, wherein the detection module comprises an amplification circuit and a sampling circuit, the discharge circuit comprises a plurality of amplifiers, and the sampling circuit comprises a plurality of samplers; one end of the amplifier is connected with the secondary coil, and the other end of the amplifier is connected with the metering processor through the sampler.

4. The nonmagnetic metering device of claim 3, wherein the metering processor has a plurality of ADC detection channels; each of the samplers is connected to one of the ADC detection channels.

5. The nonmagnetic metering device of claim 3, wherein the detection portion further comprises a discharge control module connected with the metering processor; the amplifiers are also respectively connected with the discharge control module.

6. The nonmagnetic metering device of claim 1, wherein all of the primary coils are the same size; all of the secondary coils are the same size.

7. The nonmagnetic metering device of claim 1, wherein the metalized portions of the partially metalized disks are all 1/n or (n-1)/n; n is the number of primary coils.

8. The nonmagnetic metering device of claim 1, wherein the number of primary coils and secondary coils is 3.

9. A nonmagnetic metering method for use with the nonmagnetic metering device of any of claims 1 to 8, comprising the steps of:

s1, the metering processor drives the excitation module to sequentially excite all the primary coils according to a preset sequence, simultaneously drives the detection module to sequentially detect all the secondary coils according to the preset sequence, and transmits the detection voltage value to the metering processor;

s2, the metering processor sequentially identifies the detection voltage value of each secondary coil, and if the detection voltage value is greater than or equal to a first preset voltage value, the detection voltage value is marked as a voltage value state 1; if the pressure value is less than or equal to the second preset pressure value, marking as the pressure value state 0; arranging the pressure value states of each secondary coil according to the preset sequence to obtain a pressure value state sequence;

s3, the measurement processor judges whether the pressure value state sequence is a preset sequence, if yes, the number of turns is accumulated to 1; otherwise, step S1 is executed.

10. A fluid metering apparatus comprising a non-magnetic metering device according to any one of claims 1 to 8.

Technical Field

The invention relates to the field of fluid metering, in particular to a non-magnetic metering device, a metering method and fluid metering equipment.

Background

At present, when the flow rate or flow rate of a fluid such as liquid or gas is detected, the fluid pushes a mechanical part to rotate, and the flow rate or flow rate of the liquid or gas is calculated through the rotation of a mechanical part.

The existing fluid metering technology comprises a magnetic sensing technology, an LC oscillation excitation nonmagnetic metering technology, a single primary coil excitation multi-stage coil induction type nonmagnetic metering technology and a multi-coil direct excitation nonmagnetic metering technology. The main flow metering mode is magnetic metering, most sensors adopt reed pipes and Hall elements, the sensors have magnetic characteristics and emit pulse signals under the action of magnetic fields, but the sensors have obvious defects, for example, the reed pipes are packaged by glass and can burst in areas with large weather temperature difference and transportation, and the reed pipes cannot be used for high-precision metering due to limited action times; the Hall element is a moisture-sensitive device and is easily influenced by humidity, so that the static current of the device is large, and the battery of the metering equipment is consumed in advance; the magnetic sensors have the common defect that the close proximity of the magnets can cause metering problems, and a user simulates a metering process and can reversely offset metering pulses, so that the interference of a magnetic field cannot be avoided. In the magnetic metering device, the permanent magnet is in a rotating position, and when the magnetic sensor passes by the vicinity of the magnet, the magnetic sensor can act, but the magnetic sensor is easily interfered by external magnetism, so that metering errors are caused.

The non-magnetic metering can realize metering without magnet triggering, has higher stability, high precision and stronger anti-interference capability, and slowly replaces magnetic metering. However, in the existing sensor based on LC oscillation, a metalized disc is adopted in a rotating part, damping can be changed when the rotating part is close to the disc, pulses are output through a comparator, the requirement of the mode of LC excitation on inductance is high, the inductance requires a large inductance value under the condition of increasing distance, but an iron core is arranged in the middle of a large inductor and is greatly influenced by strong magnetism, and hollow inductance can cause very weak energy and insufficient distance, so that the practical application is very poor; the non-magnetic metering of the LC oscillation mode is limited to distance reasons, an iron core inductor is needed, and the iron core is influenced by strong magnetism to influence the inductance effect, so that the interference of a magnet is not really eliminated, and only a transition technology of a magnetic metering technology and a non-magnetic metering technology is adopted; the single primary coil excites the multi-stage coil to induce, the energy is little due to the balance effect of the multi-stage secondary coil on the energy, weak signals are not conditioned in the scheme, and a comparator is directly adopted and can only adapt to short-distance non-magnetic measurement; the multi-coil direct excitation does not have a magnetic technology, a secondary coil is not provided, but the influence of a reverse magnetic field generated by eddy current on a magnetic field of a directly excited primary coil is too small, the excitation energy of the primary coil is strong, the influence of the reverse magnetic field caused by the eddy current on the primary coil is no longer a certain level, even if the reverse magnetic field is amplified, an excitation signal can be simultaneously amplified by the same times, the change caused by the eddy current is difficult to extract from an excitation source signal, and the influence on metering is large.

Patent No. ZL200680007522.8 discloses an invention patent of an induction type angular position sensor, belonging to a technical scheme of a single primary coil and multiple secondary coils, and solving the problem that the traditional magnetic sensor is easily interfered by a permanent magnet. However, because the invention adopts a single primary coil for excitation and 4 secondary coils for induction, according to the law of conservation of energy, the energy obtained by each secondary coil is only less than 1/4 in practice, and the technical scheme directly adopts a comparator for comparison, under the condition of a slight distance, the input voltage difference of the comparator is extremely small, the comparator has hysteresis voltage (tens of mV), and the output of the comparator is easy to be unstable due to the voltage range, thereby influencing the metering.

Thus, the existing fluid metering technology has shortcomings and needs to be improved and enhanced.

Disclosure of Invention

In view of the above-mentioned shortcomings of the prior art, the present invention provides a non-magnetic metering device, a metering method and a fluid metering apparatus, which are excited by a plurality of primary coils and a plurality of secondary coils, wherein the primary coils are respectively tangent and concentrically arranged in a ring, and each primary coil comprises a concentric secondary coil, so as to overcome the shortcomings of the direct excitation method and avoid the influence of the shortage of single excitation energy.

In order to achieve the purpose, the invention adopts the following technical scheme:

a non-magnetic metering device comprises a metering part and a detection part;

the metering part comprises three or more primary coils, secondary coils with the same number as the primary coils, a partially metallized disk and a shaft arranged at the center of the partially metallized disk; the single secondary coil is arranged in the single primary coil and is arranged concentrically and coplanar to form an inductively coupled single coil assembly; three or more coil assemblies formed are co-planarly mounted about the axis;

the detection part is provided with an excitation module, a detection module and a metering processor; the excitation module is respectively connected with all the primary coils and is simultaneously connected with the metering processor; the detection module is respectively connected with all the stimulation coils and is simultaneously connected with the metering processor.

Preferably, in the non-magnetic metering device, all the secondary coils are connected in parallel and then respectively connected with the detection module.

Preferably, the non-magnetic metering device, the detection module includes an amplification circuit and a sampling circuit, the discharge circuit includes a plurality of amplifiers, and the sampling circuit includes a plurality of samplers; one end of the amplifier is connected with the secondary coil, and the other end of the amplifier is connected with the metering processor through the sampler.

Preferably, the nonmagnetic metering device is provided with a plurality of ADC detection channels; each of the samplers is connected to one of the ADC detection channels.

Preferably, the detection part of the nonmagnetic metering device further comprises a discharge control module, and the discharge control module is connected with the metering processor; the amplifiers are also respectively connected with the discharge control module.

Preferably, all the primary coils of the nonmagnetic metering device have the same size; all of the secondary coils are the same size.

Preferably, the non-magnetic metering device is characterized in that the metalized part of the partially metalized disk accounts for 1/n or (n-1)/n of the whole non-magnetic metering device; n is the number of primary coils.

Preferably, the number of the primary coils and the secondary coils is 3.

A nonmagnetic metering method for the nonmagnetic metering device, comprising the steps of:

s1, the metering processor drives the excitation module to sequentially excite all the primary coils according to a preset sequence, simultaneously drives the detection module to sequentially detect all the secondary coils according to the preset sequence, and transmits the detection voltage value to the metering processor;

s2, the metering processor sequentially identifies the detection voltage value of each secondary coil, and if the detection voltage value is greater than or equal to a first preset voltage value, the detection voltage value is marked as a voltage value state 1; if the pressure value is less than or equal to the second preset pressure value, marking as the pressure value state 0; arranging the pressure value states of each secondary coil according to the preset sequence to obtain a pressure value state sequence;

s3, the measurement processor judges whether the pressure value state sequence is a preset sequence, if yes, the number of turns is accumulated to 1; otherwise, step S1 is executed.

A fluid metering device comprises the nonmagnetic metering device.

Compared with the prior art, the nonmagnetic metering device, the metering method and the fluid metering equipment provided by the invention have the following beneficial effects:

1) in the invention, each primary coil contains a secondary coil, and the energy left by removing the metal eddy current loss is basically received by the concentrically arranged secondary coils, so that the utilization rate of the energy is improved, and the metering error is small;

2) the non-magnetic metering device is limited by the structure, and the coil has a certain distance to the metal disc, so that the induction distance can be increased by increasing the energy of an excitation source and increasing the receiving area of the secondary coil;

3) the secondary coil is a complete circle in the primary coil, and when the secondary coil is matched with the partially metallized disk for use, the induction precision is higher, the receiving area is larger in an equal utilization space, and the induction distance can be increased;

4) the invention adopts an ADC detection channel to detect the induced voltage of the secondary coil, directly samples the regulated voltage value, the general conversion precision of the ADC detection channel in the metering processor can reach 12 bits, and if an oversampling technology is adopted, the conversion precision can reach 16 bits, so that under the remote condition, although the induced current is weak, the amplified signal is not large, the amplified signal can still be distinguished through ADC conversion.

Drawings

FIG. 1 is a schematic structural diagram of a non-magnetic metering device provided by the present invention;

FIG. 2 is a schematic diagram of the relative position between a partially metallized disk and a PCB in a non-magnetic metrology device provided in the present invention;

FIG. 3 is a schematic view of the coil assembly of the non-magnetic metering device of the present invention;

FIG. 4 is a circuit diagram of the nonmagnetic metering principle provided by the present invention;

FIG. 5 is a diagram of the change of the state sequence of the pressing value of the clockwise rotation of the partially metallized disk provided by the present invention;

FIG. 6 is a graph showing the variation of the state sequence of the depression values of the partially metallized disk rotating counterclockwise according to the present invention.

Detailed Description

In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

Referring to fig. 1 to 6, the present invention provides a non-magnetic metering device, which includes a metering portion and a detecting portion;

with additional reference to fig. 1, the metering section includes three or more primary coils 1/2/3, secondary coils 4/5/6 in the same number as the primary coils 1/2/3, a partially metallized disk 9, and an axis a disposed at the center of the partially metallized disk 9; a single secondary coil 4/5/6 is embedded within a single primary coil 1/2/3 and is concentrically and co-planarly disposed to form an inductively coupled single coil assembly; three or more coil assemblies are formed to be installed in the same plane around the axis A;

referring to fig. 4, the detection part has an excitation module 11, a detection module (not shown) and a metering processor 14; the excitation module 11 is connected to all the primary coils 1/2/3 respectively and also connected to the metering processor 14; the detection module is connected to all of the stimulation coils respectively and also to the measurement processor 14.

Specifically, referring to fig. 1-3, the partially metallized disk 9 rotates around an axis a, but it can be considered that the axis a rotates to drive the partially metallized disk 9 to rotate, so that the partially metallized disk 9 rotates, where the rotation may be along a direction 7 (clockwise) or a direction 8 (counterclockwise). Two adjacent primary coils 1/2/3 are tangentially arranged, and the tangent of all the tangential points is worse at the center of the axis a, so that it is required to ensure that the primary coil 1/2/3 is arranged in a balanced manner, that is, the connecting line of the central points of the primary coils 1/2/3 forms a regular polygon, such as a regular triangle or a square; each primary coil 1/2/3 is matched to one secondary coil 4/5/6. in this embodiment, primary coil 1 is matched to secondary coil 4, primary coil 2 is matched to secondary coil 5, primary coil 3 is matched to secondary coil 6, all of said primary coils 1/2/3 are of the same size, secondary coils 4/5/6 are of the same size, primary coils 1/2/3 are arranged non-pairwise with respect to each other, primary coil 1/2/3 is concentric with matched secondary coil 4/5/6, and primary coil 1/2/3 is inductively coupled to secondary coil 4/5/6. It should be noted here that the metallized portions of the partially metallized disk 9 are continuous, while the metal material of the metallized portions is the same, such as copper, iron, etc.; referring to fig. 2 and 3, the detecting part has a PCB 10, and the coil assembly is mounted on the PCB 10 according to its shape; the excitation module 11, the detection module and the metering processor 14 are all mounted on the PCB board 10. In this case, the PCB 10 is provided with the primary coil 1/2/3 and the secondary coil 4/5/6, the PCB 10 is fixed to a base watch or a structure, corresponding to a stator, the primary coil 1/2/3 is also fixed in position, and the partially metallized disk 9 is installed in a position corresponding to the coil assembly, corresponding to a rotor, according to a common use in the art.

Specifically, the working principle of the non-magnetic metering device is as follows: the primary coil 1/2/3 will generate an excitation magnetic field under the action of the excitation circuit, the excitation magnetic field passes through the corresponding secondary coil 4/5/6, the excitation magnetic field will also reach the metallized disk, an eddy current effect will be generated on the metallized disk, the eddy current will generate a magnetic field opposite to the excitation magnetic field, the secondary coil 4/5/6 will get the sum of the excitation magnetic field and the eddy current generated magnetic field, that is, a composite magnetic field, the variation of the induced current will be caused according to the variation of the magnetic field, the discharge current will be different, and the voltage of the sample will vary, according to the variation of the voltage, the sample corresponding to each secondary coil will have a maximum value of voltage and a minimum value of voltage, the partial metallized disk 9 has a part of metal, so it can be realized at different positions during the rotation process, the voltages detected by each secondary coil are different, so as to enable the position of the partially metallised disc 9 to be determined, and thus metered. In actual implementation, the detected voltage value may be regarded as the maximum voltage value as long as it is greater than a certain threshold value, and may be regarded as the minimum voltage value as long as it is less than a certain threshold value. The threshold value is selected by using a method commonly used in the field, and is not limited. The non-magnetic metering device is limited by the structure, and the coil has a certain distance to the metal disc, so that the induction distance can be increased by increasing the energy of an excitation source and increasing the receiving area of the secondary coil; meanwhile, the secondary coil is a complete circle in the primary coil, and when the secondary coil is matched with the partial metalized disc for use, the induction precision is higher, the receiving area is larger in the equal utilization space, and the induction distance can be increased. For example, in general, the general sensing distance of the non-magnetic metering device in the prior art is 7-9mm, so that the detection cannot be performed or the detection precision is extremely low, while the sensing distance of the non-magnetic metering detection device provided by the invention can reach 10-12mm or even higher, and the non-magnetic metering detection device can be more flexible in practical use.

Please refer to fig. 4, wherein L1, L2, and L3 respectively represent the primary coil 1/2/3, and L4, L5, and L6 respectively represent the secondary coil 4/5/6. Preferably, in consideration of the fact that the same potential can be achieved for each of the secondary coils during the detection process, in this embodiment, all of the secondary coils 4/5/6 are connected in parallel with each other and then connected to the detection module respectively. Therefore, the error can be greatly reduced during detection. Here, the parallel connection state is that one of two output terminals (specifically, the upper and lower output terminals of L4/L5/L6 in fig. 4) of each of the secondary coils is connected together, and the other output terminal is connected to the detection module, so that the same potential of the plurality of secondary coils is achieved when the primary coil is excited.

Preferably, in this embodiment, the detection module includes an amplifying circuit 12 and a sampling circuit 13, the discharging circuit includes a plurality of amplifiers V25/V26/V27, and the sampling circuit 13 includes a plurality of samplers; one end of the amplifier is connected to the secondary coil and the other end is connected to the metering processor 14 through one of the samplers. Preferably, the amplifier is a triode; the sampler is a capacitor C1/C2/C3.

Preferably, in this embodiment, the measurement processor 14 has a plurality of ADC (analog to digital converter) detection channels 15; each of the samplers is connected to one of the ADC detection channels 15. It should be noted here that, of course, the measurement processor 14 is an MCU (micro controller Unit) commonly used in the art, where the conversion precision of the ADC detection channel is generally 12 bits, and if an oversampling technology is used, the conversion precision can reach 16 bits, the detection precision is extremely high, and the measurement precision can be effectively ensured, so that even in a long distance (the distance between the partially metallized disk and the secondary coil), although the induced current is weak, the amplified signal is not large, but can still be distinguished through the ADC conversion.

Preferably, in this embodiment, the detection unit further includes a discharge control module 16, and the discharge control module 16 is connected to the metering processor 14; a plurality of said amplifiers are also connected to said discharge control module 16, respectively.

Preferably, in this embodiment, all the primary coils 1/2/3 have the same size; all of the secondary coils 4/5/6 are the same size.

Preferably, in the embodiment, the metalized part of the partially metalized disc 9 accounts for 1/n or (n-1)/n of the whole; n is the number of primary coils. Of course, the metallized portions of the partially metallized disk 9 may also be 1/n, 2/n, … … (n-2)/n, (n-1)/n; the determination principles are consistent and are not described in detail.

Preferably, in this embodiment, the number of the primary coils and the secondary coils is 3.

Specifically, the excitation module 11 is a driving circuit of a primary coil, and is responsible for the primary coil generating an excitation magnetic field, and the excitation circuit may be switched to act on a plurality of primary coils respectively, and may also excite simultaneously, which depends on different implementation manners, where the excitation module 11 is a common excitation module 11 in the art, and is not limited; wherein, L1, L2, and L3 respectively represent the primary coil 1/2/3, L4, L5, and L6 respectively represent the secondary coil 4/5/6, and the resistors R1/R2/R3 are grounded to provide a reference voltage (b-base level) of the amplifier circuit 12, so as to facilitate conduction of the amplifier tube, where the resistances of the resistors R1/R2/R3 are required to be equal, that is, R1 ═ R2 ═ R3; the amplifying circuit 12 amplifies weak induced current of the secondary coil 4/5/6, the amplified current is subjected to voltage sampling by the sampling circuit 13, the sampling circuit 13 configures a capacitor C1/C2/C3 for each amplifier, because the capacitor C1/C2/C3 has a voltage holding function, the abrupt change signal is not caused, and the transient interference is not easily affected, so that the capacitor C1/C2/C3 is selected as a sampling device, the capacitors C1/C2/C3 have equal capacitance values, and the temperature coefficients are good (specifically, the field implementation is taken as a reference, but not limited), the resistors R4/R5/R6 are charging current limiting resistors of the capacitors C1/C2/C3, the resistors R4/R5/R6 have equal resistance values, and the temperature coefficients are good (specifically, the field implementation is taken as a reference, not limited); after the sampling circuit 13 handles, by the inside ADC test channel 15 of measurement treater 14 converts, measurement treater 14 is controlling simultaneously discharge control module 16 can choose which way to discharge, and at this moment, excitation module 11 can be simultaneously to three primary coil stimulates, as long as control send control module just can realize detecting respectively, and the discharge time is all can be controlled, simultaneously measurement treater 14 is also controlling excitation module 11, can select a certain way of primary coil alone to stimulate. Because the excitation period is in the order of ms and the action time is in the order of ns, which is far larger than the rotation speed of the mechanical part of the metering device, the actions can be carried out in time sharing or simultaneously, and the result is not changed greatly.

The excitation module 11 drives the primary coil 1/2/3, the primary coil 1/2/3 generates an excitation magnetic field, the excitation magnetic field passes through the corresponding secondary coils 4/5/6(4, 5, 6), wherein the primary coil 1 and the secondary coil 4, the primary coil 2 and the secondary coil 5, and the primary coil 3 and the secondary coil 6 correspond to each other one by one, the excitation magnetic field also reaches the partially metallized disk 9, an eddy current effect is generated on a metal part on the partially metallized disk, the eddy current generates a magnetic field opposite to the excitation magnetic field, the secondary coil 4/5/6 obtains a sum of the excitation magnetic field and the eddy current generated magnetic field, namely a composite magnetic field, the induced current of the secondary coil 4/5/6 is amplified through the amplifying circuit 12 according to the change of the induced current caused by the change of the magnetic field, the amplified induced current becomes the discharge current of the capacitors C1, C2 and C3 in the sampling circuit 13, and since the metalized disc passes through different positions, the induced current changes, that is, the discharge currents of C1, C2 and C3 are different, and the discharge time control of the discharge control circuit is required to be consistent, so that the voltages of C1, C2 and C3 are different in the same discharge time, and are converted through the ADC detection channel 15 in the metering processor 14 to obtain different voltage values, and metering is realized according to the different voltage values (the voltage value detected by the secondary coil 4/5/6 appears periodic change when the partially metalized disc 9 rotates for one circle).

Correspondingly, the invention also provides a nonmagnetic metering method, which comprises the following steps:

s1, the metering processor 14 drives the excitation module 11 to sequentially excite all the primary coils 1/2/3 according to a predetermined sequence, drives the detection module to sequentially detect all the secondary coils 4/5/6 according to a predetermined sequence, and transmits the detected voltage values to the metering processor 14; here, it should be noted that the time of each excitation of the primary coil is a time length commonly used in the art, and is not limited; the time of each excitation is ns grade, and the time interval of the two excitations is 10-30 ms;

s2, the measurement processor 14 sequentially identifies the detected voltage value of each secondary coil 4/5/6, and if the detected voltage value is greater than or equal to a first predetermined voltage value, the detected voltage value is recorded as a voltage value state 1; if the pressure value is less than or equal to the second preset pressure value, marking as the pressure value state 0; arranging the pressure states of each of the secondary coils 4/5/6 in the predetermined order to obtain a pressure state sequence;

s3, the measurement processor 14 determines whether the pressure state sequence is a predetermined sequence, if yes, the number of turns is accumulated to 1; otherwise, step S1 is executed.

Specifically, taking the number of the primary coils as 3, and the metallized portion of the partially metallized disk 9 as 2/3 as an example, the detailed description will be given: when the partially metallized disk 9 passes through the positions of the secondary coils 4 and 6, the metering processor 14 drives the excitation module 11 to excite the primary coil 1, the primary coil 2 and the primary coil 3 in a time-sharing manner, that is, the excitation is performed according to the sequence of the primary coils 1-3, firstly the primary coil 1 is excited to generate an excitation magnetic field passing through the secondary coil 4, and simultaneously the electronic control module 16 is turned on, so that the discharge time of each coil is consistent, the excitation magnetic field passes through the metallized disk, a reverse magnetic field is generated due to an eddy current effect to pass through the secondary coil 4, so that the composite magnetic field of the secondary coil 4 is reduced, the induced current is reduced, the corresponding amplified current is correspondingly reduced after being processed by the amplifiers V25/V26/V27, so that the voltage of the capacitor C1 reaches the maximum within the equal discharge time, and a binary system is obtained after being processed by the ADC, conversion to a floating point number, here recorded as V4max (the detected voltage value is greater than said first predetermined voltage value), while the master record state is 1; then, the primary coil 2 is excited to generate an excitation magnetic field penetrating through the secondary coil 5, meanwhile, the excitation magnetic field passes through the metalized disc to generate a reverse very weak magnetic field passing through the secondary coil 5, as the metal part of the partial metalized disc 9 is not at the corresponding position of the secondary coil 5 at all, the composite magnetic field is basically equal to the excitation magnetic field, the induced current reaches the maximum value at this time, the correspondingly amplified discharge current is the maximum value, the voltage of the corresponding capacitor C2 reaches the minimum value, after ADC conversion, binary conversion is carried out to obtain a floating point number, the floating point number is recorded as V5min (the detected voltage value is smaller than the second preset voltage value), and the recording state is 0; the primary coil 3 is excited again to generate an excitation magnetic field penetrating through the secondary coil 6, the metal of the metallized disc completely covers the secondary coil 6, the excitation magnetic field generates a magnetic field reversely penetrating through the secondary coil 6 after reaching the metal, so that the composite magnetic field of the secondary coil 6 is reduced, the induced current is reduced, correspondingly amplified current is relatively reduced after being processed by the amplifying circuit 12, the capacitor C3 reaches the maximum value, the binary system obtained after ADC is output through floating point operation, the record is V6max, and the master control record state is 1; at this time, the obtained pressure state number columns are arranged in 101 order according to the secondary coil 4/5/6;

the partially metallized disk 9 rotates 120 degrees clockwise around the axis a, the metal part of the partially metallized disk 9 passes right below the secondary coils 5 and 6, the primary coil 1 is firstly excited to generate an excitation magnetic field passing through the secondary coil 4, the metallized part of the partially metallized disk 9 completely avoids the secondary coil 4, so that the influence of eddy current can be basically ignored, the composite magnetic field of the secondary coil 4 is basically equal to the excitation magnetic field, the induced current obtained by the secondary coil 4 is the largest at this time, the corresponding amplified discharge current is the largest, the voltage on the capacitor C1 reaches the minimum value, after ADC conversion, the converted floating point number is recorded as V4min, and the master control recorded state is 0; then, the primary coil 2 is excited, as the metallized disk completely passes right below the secondary coil 5, the composite magnetic field is reduced, the induced current is reduced, the corresponding amplified discharge current is reduced, the voltage on the capacitor C2 reaches the maximum value after discharge, after ADC processing, binary system is converted into floating point number and is recorded as V5max, and the master control recording state is 1; the primary coil 3 is excited again to generate an excitation magnetic field passing through the secondary coil 6, the metalized disc passes through the secondary coil 6 to cause the reduction of the composite magnetic field, the induced current corresponding to the secondary coil is reduced to cause the reduction of the amplified discharge current, C3 reaches the maximum value after discharge, after ADC processing, binary system is converted into a floating point number and is recorded as V6max, and the master control recording state is 1; at this time, the obtained pressure value state numbers are arranged in 011 order according to the order of the secondary coil 4/5/6;

the partially metallized disk 9 rotates clockwise by 120 degrees again around the axis a, at this time, the metal part of the partially metallized disk 9 just passes through the secondary coils 4 and 5, firstly the primary coil 1 is excited to generate an excitation magnetic field passing through the secondary coil 4, and simultaneously the excitation magnetic field also reaches the metal part of the partially metallized disk 9, and a reverse magnetic field is generated due to eddy current, so that the composite magnetic field of the secondary coil 4 is reduced, the induced current of the secondary coil 4 is reduced, the corresponding discharge current is reduced, the value of C1 on the capacitor reaches the maximum value after discharge, and after ADC processing, the binary re-floating point number is recorded as V4max, and the master control recording state is 1; then, exciting the primary coil 2 to generate an excitation magnetic field penetrating through the secondary coil 5, wherein the excitation magnetic field also reaches the metal part of the disc, and a reverse magnetic field is generated due to eddy current, so that the composite magnetic field of the secondary coil 4 is reduced, the induced current of the secondary coil 4 is reduced, the corresponding discharge current is reduced, the value of C2 on the capacitor reaches the maximum value after discharge, the maximum value is processed by ADC (analog to digital converter), the binary number of re-floating points is recorded as V5max, and the master control recording state is 1; the primary coil 3 is excited again to generate an excitation magnetic field penetrating through the secondary coil 6, as the metal part of the metallized disc does not pass through the secondary coil 6, the composite magnetic field is basically equal to the excitation magnetic field, the induced current of the secondary coil 6 is increased, the correspondingly amplified discharge current is increased, the voltage of the capacitor C3 reaches the minimum value after being discharged, the voltage is converted into a binary system through the ADC, the binary system is further converted into a floating point number and recorded as V6min, and the master control recording state is 0; at this time, the obtained pressure state numbers are arranged in 110 order according to the order of the secondary coil 4/5/6;

the partially metallized disk 9 is again rotated clockwise 120 degrees about axis a, the metallized portions of the partially metallized disk 9 pass over the secondary coils 4 and 6, and the process returns to step one, at which point the pressure state columns are again obtained as 101 in the order of secondary coil 4/5/6, and the nonmagnetic metering device completes one turn of the grabing. Counting the pressure state changes of 101, 011 and 110 in the clockwise rotation state of the partially metallized disk 9, as shown in fig. 5. If yes, the partial metalized disc 9 rotates counterclockwise, the operation is basically consistent, and only the rotation directions are different, so the process is not described here, and it is counted that the number of the pressing value states is 101, 110, and 011 in the counterclockwise rotation state of the partial metalized disc 9, which is specifically shown in fig. 6. When the metallized portion of the partially metallized disk 9 is 1/3, the pressure state numbers are 100, 010, and 001, and the principle is as described above.

Of course, the invention also provides fluid metering equipment comprising the nonmagnetic metering device. The fluid metering equipment comprises a water meter, a gas meter and the like, wherein the metering process is as described above, and meanwhile, the volume calculation of the water quantity or the gas quantity is also a common technical means in the field, which is not described herein again.

It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.