CN109029593A - Turbine flowmeter and flow rate testing methods - Google Patents
Turbine flowmeter and flow rate testing methods Download PDFInfo
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- CN109029593A CN109029593A CN201811208887.8A CN201811208887A CN109029593A CN 109029593 A CN109029593 A CN 109029593A CN 201811208887 A CN201811208887 A CN 201811208887A CN 109029593 A CN109029593 A CN 109029593A
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- turbine
- signal
- probe portion
- rotating disk
- probe
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
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- Fluid Mechanics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Volume Flow (AREA)
Abstract
Disclose a kind of turbine flowmeter and flow rate testing methods, by obtaining multiple amplitudes with the ac signal of turbine rotation state change, and according to the multiple amplitude with the envelope of the ac signal of turbine rotation state change come detection flows, thus, it is possible to improve the measurement accuracy of fluid flow.
Description
Technical field
The present invention relates to flow detection technical fields, and in particular to a kind of turbine flowmeter and flow rate testing methods.
Background technique
Turbine flowmeter is the equipment for detecting detection fluid flow.
Turbine flowmeter in the prior art is usually fixed on shell using induction coil and permanent magnet together,
When ferromagnetism turbo blade passes through magnet, the magnetic resistance of magnetic circuit changes, to generate inductive signal.Signal is put through amplifier
Big and shaping, is sent to counter or frequency meter, shows total instantaneous flow and cumulative amount.
However, the measuring accuracy of turbine flowmeter in the prior art is relatively low, it is easy to appear measurement error, is not suitable for
The relatively high occasion of required precision uses.
Summary of the invention
In view of this, the present invention provides a kind of turbine flowmeter and flow rate testing methods, to improve the survey of fluid flow
Accuracy of measurement.
In a first aspect, the embodiment of the present invention provides a kind of turbine flowmeter, comprising:
Multiple probe portions, each probe portion are configured as output amplitude with the ac signal of turbine rotation state change；
And
Test section is configured as the envelope of the ac signal exported according to the multiple probe portion come detection flows.
Preferably, the probe portion includes:
Oscillating circuit, for generating undamped alternating current electric signal；
Probe, for receiving undamped alternating current electric signal output amplitude with the ac signal of turbine rotation state change.
Preferably, the turbine flowmeter further includes with the rotating disk of the turbine rotation, and the probe is relative to described
Rotating disk setting；
The rotating disk is configured as changing the Distribution of Magnetic Field of the probe region during rotation.
Preferably, the probe is inductance.
Preferably, the test section detects the flow according to the comparison result of the envelope and predetermined threshold.
Preferably, the multiple probe portion includes the first probe portion and the second probe portion；
The test section is configured as the envelope of the first ac signal exported according to first probe portion and described
The rotary state of turbine described in the envelope detected of second ac signal of the second probe portion output.
Preferably, the frequency for the undamped alternating current electric signal that the oscillating circuit of the multiple probe portion generates is different.
Preferably, the oscillating circuit of the probe portion includes:
Capacitor；
The capacitance of the oscillating circuit capacitor of the multiple probe portion is different.
Preferably, the envelope of the ac signal of the multiple probe portion output is in difference in the turbine or rotating disk
It is located at different sections when the section of position.
Preferably, the test section is configured as the envelope of the first ac signal exported according to first probe portion
The position section variation of the turbine or rotating disk is obtained with the envelope of the second ac signal of second probe portion output
Time series, and the rotary state of the turbine according to the position section transformation period Sequence Detection.
Preferably, each value of the position section transformation period sequence is one of tetra- values of A, B, C, D, wherein is taken
Value A corresponds to the turbine or rotating disk is located at first position section, and value B corresponds to the turbine or rotating disk is located at second
Position section, value C corresponds to the turbine or rotating disk is located at the third place section, and value D corresponds to the turbine or rotation
Turntable is located at the 4th position section.
Preferably, the test section is configured as in detecting the position section transformation period sequence that there are sequences
A period of time of ABC, ABD, ACD, BCD and ABCD determine that the turbine or rotating disk are rotated in a first direction a circle.
Preferably, the test section is configured as in detecting the position section transformation period sequence that there are sequences
A period of time of CBA, DBA, DCA, DCB, DCBA determine that the turbine or rotating disk are rotated in a second direction, a circle.
Preferably, the test section is configured as detecting the value of the position section transformation period sequence less than 2
Interval the turbine is determined when repeating or rotating disk is dither state.
Second aspect, the embodiment of the present invention provide a kind of flow rate testing methods, comprising:
Multiple amplitudes are obtained with the ac signal of turbine rotation state change；And
According to the multiple amplitude with the envelope of the ac signal of turbine rotation state change come detection flows.
Preferably, obtaining multiple amplitudes with the ac signal of turbine rotation state change includes:
Acquisition amplitude with turbine rotation state change the first ac signal and the second ac signal；Described first hands over
The envelope difference phase of galvanic electricity signal and second ac signal.
Preferably, the method also includes:
The rotation shape of the turbine according to the envelope detected of first ac signal and second ac signal
State.
Preferably, the envelope of first ac signal and second ac signal is in the turbine or rotating disk
It is located at different sections when in different location section.
Preferably, according to the envelope detected of first ac signal and second ac signal turbine
Rotary state includes:
The turbine or rotating disk are obtained according to the envelope of first ac signal and second ac signal
Position section transformation period sequence；
According to the rotary state of turbine described in the position section transformation period Sequence Detection.
Preferably, each value of the position section transformation period sequence is one of tetra- values of A, B, C, D, wherein is taken
Value A corresponds to the turbine or rotating disk is located at first position section, and value B corresponds to the turbine or rotating disk is located at second
Position section, value C corresponds to the turbine or rotating disk is located at the third place section, and value D corresponds to the turbine or rotation
Turntable is located at the 4th position section.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
There are sequence ABC, ABD, ACD, BCD and ABCD in detecting the position section transformation period sequence for the moment
Determine that the turbine or rotating disk are rotated in a first direction a circle.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
There are sequence C BA, DBA, DCA, DCB, DCBA in detecting the position section transformation period sequence for the moment
Determine that the turbine or rotating disk are rotated in a second direction, a circle.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
The whirlpool is determined when detecting that the value of the position section transformation period sequence is repeated with the interval less than 2
Wheel or rotating disk are dither state.
The technical solution of the embodiment of the present invention by obtaining multiple amplitudes with the ac signal of turbine rotation state change,
And according to the multiple amplitude with the envelope of the ac signal of turbine rotation state change come detection flows, thus, it is possible to than
Relatively accurately measure fluid flow.
Detailed description of the invention
By referring to the drawings to the description of the embodiment of the present invention, the above and other purposes of the present invention, feature and
Advantage will be apparent from, in the accompanying drawings:
Fig. 1 is the schematic diagram of turbine flowmeter of the embodiment of the present invention；
Fig. 2 is the circuit diagram of oscillating circuit of the embodiment of the present invention；
Fig. 3 is probe portion of the embodiment of the present invention with the signal waveforms with the variation output of rotating disk relative position；
Fig. 4 is the circuit diagram of turbine flowmeter test section of the embodiment of the present invention；
Fig. 5 is the signal waveforms of test section of the embodiment of the present invention；
Fig. 6 is relative positional relationship schematic diagram of the embodiment of the present invention two probes in rotating disk rotation process；
Fig. 7 is the signal waveforms that the embodiment of the present invention two probes correspond to the output of different location relationship；
Fig. 8 is the oscillator signal waveform diagram of a comparative example turbine flowmeter；
Fig. 9 is the flow chart of flow rate testing methods of the embodiment of the present invention.
Specific embodiment
Below based on embodiment, present invention is described, but the present invention is not restricted to these embodiments.Under
Text is detailed to describe some specific detail sections in datail description of the invention.Do not have for a person skilled in the art
The present invention can also be understood completely in the description of these detail sections.In order to avoid obscuring essence of the invention, well known method, mistake
There is no narrations in detail for journey, process, element and circuit.
In addition, it should be understood by one skilled in the art that provided herein attached drawing be provided to explanation purpose, and
What attached drawing was not necessarily drawn to scale.
It will also be appreciated that in the following description, " circuit " refers to be passed through electrically by least one element or sub-circuit
The galvanic circle that connection or electromagnetism connect and compose.When title element or the " connection of another element of circuit " being connected to " or element/circuit
" between two nodes when, it, which can be, is directly coupled or connected another element or there may be intermediary element, element it
Between connection can be physically, in logic or its combination.On the contrary, when claiming element " being directly coupled to " or " directly connecting
Be connected to " another element when, it is meant that the two be not present intermediary element.
Unless the context clearly requires otherwise, "include", "comprise" otherwise throughout the specification and claims etc. are similar
Word should be construed as the meaning for including rather than exclusive or exhaustive meaning；That is, be " including but not limited to " contains
Justice.
In the description of the present invention, it is to be understood that, term " first ", " second " etc. are used for description purposes only, without
It can be interpreted as indication or suggestion relative importance.In addition, in the description of the present invention, unless otherwise indicated, the meaning of " multiple "
It is two or more.
Fig. 1 is the schematic diagram of turbine flowmeter of the embodiment of the present invention.As shown in Figure 1, turbine flowmeter includes the first detection
Portion 1, the second probe portion 2 and test section 3.First probe portion 1 and the second probe portion 2 are configured to output amplitude and turn with turbine
The first ac signal and the second ac signal of dynamic state change.Test section 3 is configured as according to the first ac signal
Carry out detection flows with the envelope of the second ac signal.In an optional implementation, the turbine of turbine flowmeter is configured
For the Distribution of Magnetic Field for changing ambient enviroment during rotation, so that the first probe portion 1 and the second probe portion 2 can be with magnetic
The change of field distribution exports corresponding ac signal.In another optional implementation, eddy-current flowmeter is arranged with turbine
The rotating disk 4 of rotation, rotating disk 4 is configured as changing the Distribution of Magnetic Field of ambient enviroment during rotation, so that first
Probe portion 1 and the second probe portion 2 can export corresponding ac signal with the change of Distribution of Magnetic Field.Rotating disk 4 is arranged can be with
So that the setting of the first probe portion 1 and the second probe portion 2 is not only restricted to the position of turbine, meanwhile, setting rotating disk 4 allows to
Its revolving speed ratio with turbine is adjusted, it is also possible that the parameter setting of probe portion is more convenient.
Specifically, magnetic material can be arranged in a manner of asymmetric by the inside or surface in turbine or rotating disk 4
And/or metal, so that turbine or rotating disk 4 can change the Distribution of Magnetic Field of surrounding enviroment when rotating.
The turbine flowmeter of the embodiment of the present invention is by taking two probe portions as an example, it should be appreciated that the detection of the turbine flowmeter
Portion may be three or more.By obtaining multiple amplitudes with the ac signal of turbine rotation state change, and according to
The multiple amplitude carrys out detection flows with the envelope of the ac signal of turbine rotation state change.
In the present embodiment, the first probe portion 1 includes the first oscillating circuit 11 and the first probe 12.First oscillating circuit 11
For generating the first undamped alternating current electric signal.First probe 12 is for receiving the first undamped alternating current electric signal and exporting with rotating disk
First ac signal of 4 rotary states variation.In embodiments of the present invention, the first probe 12 is inductance L1.When the first oscillation
When the first undamped alternating current electric signal that circuit 11 generates is by the first probe 11, the first alternation is generated around the first probe 11
Magnetic field.When magnetic material in the effective range of the first alternating magnetic field and/or metal, magnetic field can be with magnetic material and/or gold
Belong to mobile variation and changes.This variation is converted into voltage or curent change to influence the output exchange of the first probe portion 12
The amplitude of electric signal.
Second probe portion 2 includes the second oscillating circuit 21 and the second probe 22.Second oscillating circuit 21 is for generating second
Undamped alternating current electric signal.Second probe 12 becomes for receiving the second undamped alternating current electric signal and exporting with 4 rotary state of rotating disk
The second ac signal changed.In embodiments of the present invention, second probe 22 is inductance L2.When the second oscillating circuit 21 produces
When the second raw undamped alternating current electric signal is by the second probe 21, the second alternating magnetic field is generated around the second probe 21.When
Magnetic material and/or when metal in the effective range of second alternating magnetic field, magnetic field can become with magnetic material and/or metal are mobile
Change and changes.This variation is converted into voltage or curent change to influence the output ac signal width of the second probe portion 22
Value.
When the frequency of undamped alternating current electric signal is several times even tens times of turbine or rotating disk rotational frequency, for width
The variation meeting of value so that the envelope of the first ac signal and the second ac signal with the turned position of turbine or rotating disk
It is different and change.
The envelope that test section 3 passes through detection the first ac signal and the second ac signal, it can detect turbine
Rotary state, to calculate its velocity of rotation, and then flow is calculated according to the velocity of rotation of turbine.
Preferably, turbine flowmeter further includes communication section 5 and control unit 6.Test section 3 by communication section 5 and control unit 6 into
Row communication.Control unit 6 calculates fluid flow according to the output signal of test section 3.Control unit 6 can pass through MCU
(Microcontroller Unit, micro-control unit), PLC (Programmable Logic Controller, it is programmable to patrol
Volume controller), FPGA (Field-Programmable Gate Array, field programmable gate array), DSP (Digital
Signal Processor, digital signal processor) or specific integrated circuit realize.
Fig. 2 is the circuit diagram of oscillating circuit of the embodiment of the present invention.As shown in Fig. 2, the oscillating circuit packet of the embodiment of the present invention
Include DC power supply DC, capacitor CX and transistor circuit 11a.In embodiments of the present invention, probe (not shown) is connected to AB
Both ends, it is in parallel with capacitor CX.Transistor circuit 11a is made of two transistor Opposite direction connections, and in the present embodiment, transistor is
MOS (metal oxide semiconductor, Metal Oxide Semiconductor Field Effect Transistor) pipe.It should be understood that transistor electricity
Road 11a can also be made of triode or other transistors.When DC power supply DC is to power on circuitry, in the wink of power on circuitry stream
Between capacitor CX can generate a charging pulse, probe can generate a self-induced e.m.f, because the electric current and voltage max of the two exist
90 degree of mutual deviation on time phase, cause to vibrate, to form pure oscillation signal VAB at the both ends AB.Transistor circuit 11a is in function
Can on be equivalent to a negative resistance, noise can be reduced, improve the performance of oscillating circuit.It should be understood that oscillating circuit shown in Fig. 2 is only
It is one of implementation of the present embodiment, other oscillating circuits that can generate undamped alternating current electric signal can be applied to this
In embodiment.
The embodiment of the present invention is by probe inductance formation LC oscillation circuit in parallel with the capacitor CX of oscillating circuit, thus in AB
Both ends form pure oscillation signal.Meanwhile in an optional implementation, inductance can be set in oscillating circuit, with
The capacitor CX parallel connection is to form LC oscillation circuit, to form pure oscillation signal at the both ends AB.It in this way can be to probe
Inductance value is suitably adjusted, to reach superior technique effect.
Fig. 3 is probe portion of the embodiment of the present invention with the signal waveforms with the variation output of rotating disk relative position.Such as Fig. 3 institute
Show, the half of rotating disk 4 is set as nonmetallic materials, the other half is set as metal material (dash area in such as figure).It revolves as a result,
Turntable 4 relative to probe position can there are two types of: position a and position b.Position a, the non-metallic part of rotating disk 4, which is located at, to be visited
Capitiform at field region.Position b, the metal part of rotating disk 4 are located at the field region that probe is formed.When rotating disk 4 is located at
When a of position, the non-metallic part of rotating disk 4 is located at the field region that probe is formed, i.e., in t4-t5 or t6-t7 period, rotation
Disk 4 does not influence or influences very little on the magnetic field at probe, and the feedback voltage V FB that probe portion exports ac signal is larger.When
When rotating disk 4 is located at position b, the metal part of rotating disk 4 is located at the field region that probe is formed, i.e., in t5-t6 or t7-t8
Between section, the metal part of rotating disk 4 in magnetic field due to rotating at this time, so as to cause the feedback voltage of probe portion output signal
VFB amplitude reduces.
The embodiment of the present invention passes through acquisition amplitude with the ac signal of turbine rotation state change, and according to the amplitude
With the envelope and a certain moment rotating disk of predetermined threshold multilevel iudge of the ac signal of turbine rotation state change relative to spy
The position of head, so as to calculate the revolving speed of turbine, by the revolving speed of turbine and pipeline specifications can with calculate and flow through pipeline
Fluid flow.
Fig. 4 is the circuit diagram of turbine flowmeter test section of the embodiment of the present invention.As shown in figure 4, test section 3 includes buffer
Buf, envelope detector 31, comparator cmp and filter circuit 32.For characterizing the feedback electricity of the output ac signal of probe portion
Pressure VFB is output to envelope detector 31 via buffer buf, and envelope detector 31 will be exported after feedback voltage V FB processing
The envelope of ac signal, and it is output to one end (reverse input end) of comparator cmp.The other end of comparator cmp is (the same as mutually defeated
Enter end) input predetermined threshold VREF, the envelope for exporting ac signal is passed through by filter circuit afterwards compared with predetermined threshold VREF
Output signal VP.In an optional implementation manner, the undamped alternating current that predetermined threshold VREF can be exported according to oscillating circuit
The amplitude of electric signal is configured with it by rotating disk effect.Metal material is set as with rotating disk half below, separately
Half is set as being illustrated for nonmetallic materials.It should be understood that in a non-symmetrical way can also be with come the other way that is arranged
Realize same or similar effect.When Distribution of Magnetic Field region of the non-metallic part of rotating disk 4 in probe, output exchange telecommunications
Number envelope be located at first interval, output signal VP is smaller.When the metal part of rotating disk 4 is in the Distribution of Magnetic Field region of probe
When, the envelope of output voltage is located at second interval, and output signal VP is larger.It can be judged in this way according to the size of output signal VP
Position of the rotating disk 4 relative to probe portion.
In the present embodiment, the non-inverting input terminal and inverting input terminal of comparator cmp input respectively predetermined threshold VREF and
Export ac signal envelope, therefore, export ac signal envelope be located at first interval when, output signal VP compared with
Small, when being located at second interval, output signal VP is larger.It should be understood that the circuit that those skilled in the art can also be similar or equivalent
Structure, such as exchange the identical function of connection relationship realization of input terminal.
Fig. 5 is the signal waveforms of test section of the embodiment of the present invention.As shown in figure 5, before time tl, rotating disk 4
For non-metallic part in the Distribution of Magnetic Field region of probe, the feedback voltage V FB of output voltage is larger, exports the envelope of ac signal
VE_FB is located at first interval, is higher than predetermined threshold VREF, at this point, the output voltage VP of test section is lower.In the t1-t2 period
Interior, the metal part of rotating disk 4 initially enters the Distribution of Magnetic Field region of probe, and the amplitude of feedback voltage V FB starts to be gradually reduced,
The envelope VE_FB of output voltage declines, but is still higher than predetermined threshold VREF, at this point, the output voltage VP of test section 3 keeps original
State is constant.Within the t2-t3 period, the metal part of rotating disk 4 in the Distribution of Magnetic Field region of probe, feedback voltage V FB's
Amplitude is begun to decline, and the envelope VE_FB for exporting ac signal drops to second interval, is lower than predetermined threshold VREF, output electricity
Pressure VP is begun to ramp up.At the t3 moment, output voltage VP rises to highest, remains unchanged after t3.
Fig. 6 is relative positional relationship schematic diagram of the embodiment of the present invention two probes in rotating disk rotation process.Such as Fig. 6
Shown, the turbine flowmeter of the embodiment of the present invention includes two probe portions, the first probe portion 1 and the second probe portion 2.In the present invention
In embodiment, rotating disk 4 has 4 kinds relative to the position of the first probe portion 1 and the second probe portion 2.Position a, the non-gold of rotating disk 4
Belong to the field region that part is located at the first probe portion 1, the metal part of rotating disk 4 is located at the field region of the second probe portion 2.Position
B is set, the non-metallic part of rotating disk 4 is located at the field region of the first probe portion 1 and the second probe portion 2.Position c, rotating disk 4
Metal part is located at the field region of the first probe portion 1, and the non-metallic part of rotating disk 4 is located at the field regions of the second probe portion 2
Domain.Position d, the metal part of rotating disk 4 are located at the field region of the first probe portion 1 and the second probe portion 2.
Fig. 7 is the signal waveforms that the embodiment of the present invention two probes correspond to the output of different location relationship.Such as Fig. 7 institute
Show, rotating disk 4 corresponds to different values relative to each position of the first probe portion 1 and the second probe portion 2, rotating disk 4 it is non-
When metal part is located at the field region of probe portion, the output signal VP of test section 3 is low, value 0；The metal of rotating disk 4
When part is located at the field region of probe portion, the output signal VP of test section 3 is height, value 1.A, b, c, d are corresponding for position
Value is respectively A, B, C, D, then A, B, C, D are respectively 01,00,10,11.
Specifically, in the t9-t10 period, rotating disk 4 is a relative to the position of two probe portions, i.e., rotating disk 4 is non-
Metal part is located at the field region of the first probe portion 1, and metal part is located at the field region of the second probe portion 2.At this point, first
The envelope VE_FB1 that probe portion 1 exports ac signal is larger, is higher than threshold voltage VREF, the output signal VP1 of comparator CMP
For low level (0).The envelope VE_FB2 that second probe portion 2 exports ac signal is smaller, is lower than threshold voltage VREF, comparator
The output signal VP2 of CMP is high level (1).That is the corresponding value A of position a is 01.
In the t10-t11 period, rotating disk 4 is b, the i.e. non-metal portion of rotating disk 4 relative to the position of two probe portions
Quartile is in the field region of the first probe portion 1 and the second probe portion 2.At this point, the envelope of the first probe portion 1 output ac signal
VE_FB1 is larger, is higher than threshold voltage VREF, and the output signal VP1 of comparator CMP is low level (0).The output of second probe portion 2
The envelope VE_FB2 of ac signal is larger, is higher than threshold voltage VREF, and the output signal VP2 of comparator CMP is low level
(0).That is the corresponding value B of position b is 00.
In the t11-t12 period, rotating disk 4 is c, the i.e. metal part of rotating disk 4 relative to the position of two probe portions
Positioned at the field region of the first probe portion 1, the non-metallic part of rotating disk 4 is located at the field region of the second probe portion 2.At this point,
The envelope VE_FB1 that first probe portion 1 exports ac signal is smaller, is lower than threshold voltage VREF, and the output of comparator CMP is believed
Number VP1 is high level (1).The envelope VE_FB2 that second probe portion 2 exports ac signal is larger, is higher than threshold voltage VREF,
The output signal VP2 of comparator CMP is low level (0).That is the corresponding value C of position c is 10.
In the t12-t13 period, rotating disk 4 is d, the i.e. metal part of rotating disk 4 relative to the position of two probe portions
Positioned at the field region of the first probe portion 1 and the second probe portion 2.At this point, the envelope of the first probe portion 1 output ac signal
VE_FB1 is smaller, is lower than threshold voltage VREF, and the output signal VP1 of comparator CMP is high level (1).The output of second probe portion 2
The envelope VE_FB2 of ac signal is smaller, is lower than threshold voltage VREF, and the output signal VP2 of comparator CMP is high level
(1).That is the corresponding value D of position d is 11.
Turbine flowmeter can be according to the output signal VP of the comparator CMP of the first probe portion 1 and the second probe portion 2 as a result,
Value judge position of the rotating disk 4 relative to two probe portions, to judge the turnning circle and rotation direction of rotating disk 4.
Specifically, when test section 3 in detecting the position section transformation period sequence there are sequence ABC, ABD,
A period of time of ACD, BCD and ABCD determine the rotating disk 4 along first direction one circle of rotation (clockwise).
When test section 3 in detecting the position section transformation period sequence there are sequence C BA, DBA, DCDA, DCB,
A period of time of DCBA determines the rotating disk 4 one circle of rotation (counterclockwise) in a second direction.
When test section 3 is when the value for detecting the position section transformation period sequence is repeated with the interval less than 2
(such as ABABCDA) determines that the rotating disk 4 is dither state.
The embodiment of the present invention, which passes through, obtains two amplitudes with the ac signal of turbine rotation state change, and according to described
Two amplitudes obtain the rotation direction and number of revolutions of rotating disk with the envelope of the ac signal of turbine rotation state change,
Thus, it is possible to which relatively accurately fluid flow is detected, it is also possible to reduce due to rotating disk shake and bring survey
Measure error.
However, due in turbine flowmeter there are multiple probe portions, can mutual coupling between the oscillating circuit of different probe portions
Interference is closed, output result detection mistake is caused.Fig. 8 is the oscillator signal waveform diagram of a comparative example turbine flowmeter.Such as Fig. 8 institute
Show, include two probe portions in the turbine flowmeter in the comparative example, the oscillating circuit of two probe portions generates amplitude, frequency respectively
The all of substantially equal undamped alternating current electric signal of rate.But since interference can be mutually coupled between oscillating circuit, so that output exchange
Electric signal VOSC has been superimposed the resonance frequency of low frequency, so as to cause two probe portions the ac signal that generates of oscillating circuit not
Constant amplitude, so influence after afterflow rate detection.Therefore, in the comparative example, due to the coupled interference between oscillating circuit, so that
The amplitude fluctuations of its ac signal VOSC generated are larger, be easy to cause fluid flow to detect mistake in this way, or even cannot examine
It surveys.
As a result, in an optional implementation, the first probe portion 1 and the second probe portion 2 are configured as oscillating circuit
Resonance frequency it is unequal, to reduce the coupled interference between oscillating circuit so that oscillating circuit generate exchange telecommunications
Number amplitude be held essentially constant to improve the accuracy of flow detection.Specifically, the first probe portion 1 and second can be set to visit
The probe inductance in survey portion 2 is identical, and the capacitance that oscillating circuit capacitor is arranged is different, so that the first probe portion 1 and second is visited
The resonance frequency of the oscillating circuit in survey portion 2 is unequal, to reduce the coupled interference between oscillating circuit, is similar to be formed
Width ac signal improves measurement accuracy.
Fig. 9 is the flow chart of flow rate testing methods of the embodiment of the present invention.As shown in figure 9, flow detection of the embodiment of the present invention
Method the following steps are included:
S100, multiple amplitudes are obtained with the ac signal of turbine rotation state change.
S200, according to the multiple amplitude with the envelope of the ac signal of turbine rotation state change come detection flows.
Preferably, obtaining multiple amplitudes with the ac signal of turbine rotation state change includes:
Acquisition amplitude with turbine rotation state change the first ac signal and the second ac signal；Described first hands over
The envelope difference phase of galvanic electricity signal and second ac signal.
Preferably, the method also includes:
The rotation shape of the turbine according to the envelope detected of first ac signal and second ac signal
State.
Preferably, the envelope of first ac signal and second ac signal is in the turbine or rotating disk
It is located at different sections when in different location section.
Preferably, according to the envelope detected of first ac signal and second ac signal turbine
Rotary state includes:
The turbine or rotating disk are obtained according to the envelope of first ac signal and second ac signal
Position section transformation period sequence；
According to the rotary state of turbine described in the position section transformation period Sequence Detection.
Preferably, each value of the position section transformation period sequence is one of tetra- values of A, B, C, D, wherein is taken
Value A corresponds to the turbine or rotating disk is located at first position section, and value B corresponds to the turbine or rotating disk is located at second
Position section, value C corresponds to the turbine or rotating disk is located at the third place section, and value D corresponds to the turbine or rotation
Turntable is located at the 4th position section.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
There are sequence ABC, ABD, ACD, BCD and ABCD in detecting the position section transformation period sequence for the moment
Determine that the turbine or rotating disk are rotated in a first direction a circle.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
There are sequence C BA, DBA, DCA, DCB, DCBA in detecting the position section transformation period sequence for the moment
Determine that the turbine or rotating disk are rotated in a second direction, a circle.
Preferably, the rotary state of the turbine according to the position section transformation period Sequence Detection includes:
The whirlpool is determined when detecting that the value of the position section transformation period sequence is repeated with the interval less than 2
Wheel or rotating disk are dither state.
The embodiment of the present invention, which passes through, obtains at least one amplitude with the ac signal of turbine rotation state change, and according to
At least one described amplitude carrys out detection flows with the envelope of the ac signal of turbine rotation state change, thus, it is possible to improve
The precision of flow detection.
The above description is only a preferred embodiment of the present invention, is not intended to restrict the invention, for those skilled in the art
For, the invention can have various changes and changes.All any modifications made within the spirit and principles of the present invention are equal
Replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (11)
1. a kind of turbine flowmeter characterized by comprising
Multiple probe portions, each probe portion are configured as output amplitude with the ac signal of turbine rotation state change；And
Test section is configured as the envelope of the ac signal exported according to the multiple probe portion come detection flows.
2. turbine flowmeter according to claim 1, which is characterized in that the probe portion includes:
Oscillating circuit, for generating undamped alternating current electric signal；
Probe, for receiving undamped alternating current electric signal output amplitude with the ac signal of turbine rotation state change.
3. turbine flowmeter according to claim 2, which is characterized in that the turbine flowmeter further includes with the turbine
The rotating disk of rotation, the probe are arranged relative to the rotating disk；
The rotating disk is configured as changing the Distribution of Magnetic Field of the probe region during rotation.
4. turbine flowmeter according to claim 2, which is characterized in that the probe is inductance.
5. turbine flowmeter according to claim 1, which is characterized in that the test section is according to the envelope and predetermined threshold
The comparison result of value detects the flow.
6. turbine flowmeter according to claim 1, which is characterized in that the multiple probe portion include the first probe portion and
Second probe portion；
The test section is configured as the envelope and described second of the first ac signal exported according to first probe portion
The rotary state of turbine described in the envelope detected of second ac signal of probe portion output.
7. turbine flowmeter according to claim 2, which is characterized in that the oscillating circuit of the multiple probe portion generated
The frequency of undamped alternating current electric signal is different.
8. turbine flowmeter according to claim 7, which is characterized in that the oscillating circuit of the probe portion includes:
Capacitor；
The capacitance of the oscillating circuit capacitor of the multiple probe portion is different.
9. turbine flowmeter according to claim 8, which is characterized in that the ac signal of the multiple probe portion output
Envelope when the turbine or rotating disk are in different location section be located at different sections.
10. turbine flowmeter according to claim 9, which is characterized in that the test section is configured as according to described
The envelope of second ac signal of the envelope and second probe portion output of the first ac signal of one probe portion output
The position section transformation period sequence of the turbine or rotating disk is obtained, and according to the position section transformation period Sequence Detection
The rotary state of the turbine.
11. a kind of flow rate testing methods characterized by comprising
Multiple amplitudes are obtained with the ac signal of turbine rotation state change；And
According to the multiple amplitude with the envelope of the ac signal of turbine rotation state change come detection flows.
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| CN201811208887.8A CN109029593B (en) | 2018-10-17 | 2018-10-17 | Turbine flowmeter and flow detection method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811208887.8A CN109029593B (en) | 2018-10-17 | 2018-10-17 | Turbine flowmeter and flow detection method |
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| CN109029593B CN109029593B (en) | 2020-05-12 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286246A (en) * | 2019-07-25 | 2019-09-27 | 深圳市普颂电子有限公司 | Secondary speed detection method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5450760A (en) * | 1993-10-18 | 1995-09-19 | Lew; Hyok S. | Turbine flowmeter with capacitive transducer |
| CN1468366A (en) * | 2000-08-09 | 2004-01-14 | 艾尔斯特测量技术有限责任公司 | A device and a method for non-contacting sensing of the rotational state of a rotor |
| CN105318918A (en) * | 2015-08-13 | 2016-02-10 | 利尔达科技集团股份有限公司 | A non-magnetic flow metering device and a metering method thereof |
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2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5450760A (en) * | 1993-10-18 | 1995-09-19 | Lew; Hyok S. | Turbine flowmeter with capacitive transducer |
| CN1468366A (en) * | 2000-08-09 | 2004-01-14 | 艾尔斯特测量技术有限责任公司 | A device and a method for non-contacting sensing of the rotational state of a rotor |
| CN105318918A (en) * | 2015-08-13 | 2016-02-10 | 利尔达科技集团股份有限公司 | A non-magnetic flow metering device and a metering method thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110286246A (en) * | 2019-07-25 | 2019-09-27 | 深圳市普颂电子有限公司 | Secondary speed detection method and device |
| CN110286246B (en) * | 2019-07-25 | 2021-03-23 | 深圳市普颂电子有限公司 | Turbine rotating speed detection method and device |
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| Publication number | Publication date |
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| CN109029593B (en) | 2020-05-12 |
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