CN203414122U - Liquid flow non-magnetic detecting device - Google Patents
Liquid flow non-magnetic detecting device Download PDFInfo
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- CN203414122U CN203414122U CN201320517515.XU CN201320517515U CN203414122U CN 203414122 U CN203414122 U CN 203414122U CN 201320517515 U CN201320517515 U CN 201320517515U CN 203414122 U CN203414122 U CN 203414122U
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Abstract
The utility model relates to a liquid flow non-magnetic detecting device which comprises a microprocessor unit, a power source control circuit, a drive control circuit, an LC oscillating circuit, an LC oscillation detection circuit, an envelope detection circuit and a triggering circuit. The power source control circuit and the drive control circuit are connected with the microprocessor unit and the LC oscillating circuit, the LC oscillation detection circuit, the envelope detection circuit and the triggering circuit are connected in sequence. The output end of the power source control circuit and the output end of the drive control circuit are connected with the two ends of the LC oscillation circuit respectively. The triggering circuit is connected with a timer capturing input end of the microprocessor unit. The LC oscillating circuit is located above an impeller, a half of the impeller is an insulation zone, and the other half of the impeller is an electric conductive zone. After oscillation waveform output by the LC oscillating circuit is processed through the LC oscillation detection circuit, the envelope detection circuit and the triggering circuit, timer capture is conducted on the oscillation waveform by the microprocessor unit. Position change of the electric conductive zone and the insulation zone of the impeller is judged and finally the liquid flow is calculated. The liquid flow non-magnetic detecting device is long in measurement distance, wide in application range, capable of enabling limitation of selection of single chip microcomputers to be small and reducing cost and good in universality.
Description
Technical field
The utility model relates to a kind of non-magnetic flowmeter, relates in particular to a kind of fluid flow without magnetic detection device.
Background technology
In water meter with nonmagnetic, current more employing MSP430FW427 chip microcontroller flow detection, this single-chip microcomputer is inner integrated SCAN IF is without magnetic detection module.SCAN IF is the peculiar module of MSP430FW42X series monolithic that TIX releases without magnetic detection module, it can, in the motion of automatic inspection line under low-power consumption or rotation, be mainly used in the instrument such as heat meter, hot water and cold water instrument, gas instrument and industrial flow meter.In existing water meter with nonmagnetic, flow detection part is mainly comprised of without magnetic detection module and two external LC sensors thereof the SCAN IF of single-chip microcomputer inside, and LC sensor is placed in the top of water meter turbine, and half of impeller is insulating material, and second half is covered with metallic copper.When LC sensor is when doing LC vibration, while running into the region that is covered with copper, vibration is decay very soon, and its waveform as shown in Figure 1; While running into insulative material region, oscillatory extinction is slower, and its waveform as shown in Figure 2.Visible LC sensor above insulative material region time oscillatory extinction process a lot of slowly than above being covered with the region of copper time.By setting suitable reference voltage and delay time, if the crest of waveform is all under reference voltage in Measuring Time, just can determine that now LC sensor is in being covered with the region of copper, otherwise in insulative material region.And SCAN IF in MSP430FW42X series monolithic without magnetic detection module by AFE (analog front end) (AFE), signal treatment state machine (PSM) and sequential state machine (TSM) three parts form, AFE (analog front end) is for encouraging external LC sensor, sensor can connect at most four, can be selected by analog input multi-way switch, selected sensor is by the direct input comparator of its simulating signal, comparer is compared selected simulating signal with the reference voltage of the digital to analog converter generation of 10, if voltage is output as height more than reference voltage, otherwise be low, so just outside simulating signal is converted to digital signal.Digital signal after conversion is admitted to a programmable signal treatment state machine, it processes this digital signal by the state table being stored in MSP430FW42X series monolithic, control the generation that SCAN IF interrupts without magnetic detection module, thereby judge flow velocity and the direction of flow, reach the object of flow detection.Existing flow, without magnetic detection mode, can only could be realized on MSP430FW42X series monolithic, cannot on other low-cost monolithic machines, realize, and therefore, existing water meter with nonmagnetic cost is high, has in the use very large limitation.On the other hand, this without magnetic detection mode, copper layer on impeller is that 0.1mm is when thick, the spacing of LC sensor and impeller can not surpass 3mm, therefore just can measure, at some watchcases, require in thicker instrument, as watchcase thickness is greater than the instrument of 5mm, just can not adopt thisly without magnetic detection mode, range of application is limited.
Summary of the invention
It is less without the measuring distance of magnetic measuring device that the utility model mainly solves original flow, cannot in the thicker instrument of watchcase, realize and measuring, the technical matters that usable range is less; Provide a kind of fluid flow without magnetic detection device, its measuring distance is larger, and his-and-hers watches thickness of the shell is not placed restrictions on, no matter watchcase is thick or thin, can realize flow measurement, and usable range is wide.
The utility model solves original flow simultaneously and must use MSP430FW42X series monolithic could realize flow measurement without magnetic measuring device, cannot realize with other low-cost monolithic machines, and cost is high, has circumscribed technical matters; Provide a kind of fluid flow without magnetic detection device, its single-chip microcomputer used only need meet and has timer capture function and just can realize flow measurement, and therefore available low-cost monolithic machine is realized, and effectively reduces costs, and has very strong transplantability, and versatility is good.
Above-mentioned technical matters of the present utility model is mainly solved by following technical proposals: the utility model comprises the LC oscillatory circuit of the impeller top that is arranged on liquid meter, impeller is towards the one side of LC oscillatory circuit, half is the insulating regions that insulating material is made, second half is the conductive region that conductive material is made, also comprise microprocessor unit, power control circuit, excitation control circuit, LC oscillation detection circuit, envelope detection circuit and trigger circuit, the first output terminal of described microprocessor unit is connected with the input end of described power control circuit, the second output terminal of microprocessor unit is connected with the input end of described excitation control circuit, power control circuit, the output terminal of excitation control circuit is connected with the two ends of described LC oscillatory circuit respectively, the oscillation output end of LC oscillatory circuit is connected with the input end of described envelope detection circuit, the output terminal of envelope detection circuit is connected with the input end of described trigger circuit, the timer capture input end of the output terminal of trigger circuit and described microprocessor unit is connected.The first output terminal output control signal of microprocessor unit is to the input end of power control circuit, make power control circuit unlocking electronic switch realize power supply, high level pulse signal of the second output terminal output of microprocessor unit is given the input end of excitation control circuit, excitation control circuit encourages control, makes LC oscillatory circuit carry out the charging of a period of time.Charge after electricity, the second output terminal of microprocessor unit becomes low level signal, making to encourage control circuit to stop excitation controlling, LC oscillatory circuit starting oscillation, the waveform of output is under the effect of LC oscillation detection circuit and envelope detection circuit, extract in waveform the part higher than reference voltage, again after trigger circuit shaping, flow to the timer capture input end of microprocessor unit, analysis and processing finally by microprocessor unit, judge the change in location of conductive region and insulating regions on impeller, finally calculate the fluid flow that flows through liquid meter.The utility model single-chip microcomputer used only need meet and has timer capture function and just can realize flow measurement, therefore available low-cost monolithic machine is realized, as 8 machine STM8L052 single-chip microcomputers, price is less than half of MSP430FW42X series monolithic, single-chip microcomputer is selected and is not had limitation, can greatly reduce costs, have very strong transplantability, versatility is good.And the measuring distance between LC oscillatory circuit and impeller can reach 5～8mm, measuring distance is larger, in the thicker instrument of watchcase, also can realize flow measurement, and usable range is wide.
As preferably, described power control circuit comprises resistance R 1 and triode T1, and described excitation control circuit comprises resistance R 3, resistance R 5, capacitor C 3 and triode T3, and described LC oscillation detection circuit comprises resistance R 4, capacitor C 2 and triode T2, one end of resistance R 1, one end of resistance R 3 respectively with the first output terminal of described microprocessor unit, the second output terminal is connected, the other end of resistance R 1 is connected with the base stage of triode T1, the other end of resistance R 3 is connected with the base stage of triode T3 through capacitor C 3, the emitter of triode T1 meets voltage VCC, the collector of triode T1 is connected with one end of the parallel circuit of inductance L 1 with the capacitor C 1 that forms LC oscillatory circuit through resistance R 2, the collector of another termination triode T3 of this parallel circuit, the grounded emitter of triode T3, resistance R 5 is connected between the base stage of triode T3 and the emitter of triode T3, capacitor C 2 and resistance R 4 parallel connections, one end of this parallel circuit is connected with the collector of triode T3, the other end of this parallel circuit is connected with the base stage of triode T2, the emitter of triode T2 is connected with the also contact of capacitor C 1, inductance L 1 and resistance R 2, and the collector of triode T2 is connected with the input end of described envelope detection circuit.
As preferably, described envelope detection circuit comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5 and diode D, the output terminal of described LC oscillation detection circuit is connected with the positive pole of diode D, resistance R 6 and capacitor C 4 parallel connections, one end of this parallel circuit is connected with the positive pole of diode D, the other end ground connection of this parallel circuit, resistance R 7 and capacitor C 5 parallel connections, one end of this parallel circuit is connected with the negative pole of diode D, the other end ground connection of this parallel circuit, the negative pole of diode D is connected with the input end of described trigger circuit.
As preferably, described trigger circuit are not gate U, and the input end of not gate U is connected with the output terminal of described envelope detection circuit, and the timer capture input end of the output terminal of not gate U and described microprocessor unit is connected.Trigger circuit also can adopt comparer to realize, and can reach wave shaping object equally.
As preferably, described trigger circuit are not gate U, and the input end of not gate U is connected with the negative pole of diode D, and the timer capture input end of the output terminal of not gate U and described microprocessor unit is connected.Trigger circuit also can adopt comparer to realize, and can reach wave shaping object equally.
The beneficial effects of the utility model are: single-chip microcomputer used only need meet and has timer capture function and just can realize flow measurement, therefore available low-cost monolithic machine is realized, and single-chip microcomputer is selected and do not had limitation, can greatly reduce costs, have very strong transplantability, versatility is good.And the measuring distance between LC oscillatory circuit and impeller is larger, in the thicker instrument of watchcase, also can realize flow measurement, usable range is wide.
Accompanying drawing explanation
Fig. 1 is the waveform that LC sensor is exported while running into the region that is covered with copper on impeller.
Fig. 2 is the waveform that LC sensor is exported while running into insulating regions on impeller.
Fig. 3 is a kind of circuit theory syndeton block diagram of the present utility model.
Fig. 4 is a kind of circuit theory diagrams of the present utility model.
Fig. 5 is a kind of structural representation of the installation site relation of LC oscillatory circuit and impeller in the utility model.
Fig. 6 is when in the utility model, LC oscillatory circuit is positioned at the insulating regions top of impeller, input waveform and the output waveform of trigger circuit.
Fig. 7 is when in the utility model, LC oscillatory circuit is positioned at the conductive region top of impeller, input waveform and the output waveform of trigger circuit.
1. LC oscillatory circuits in figure, 2. microprocessor unit, 3. power control circuit, 4. excitation control circuit, 5.LC oscillation detection circuit, 6. envelope detection circuit, 7. trigger circuit, 8. impeller, 9. insulating regions, 10. conductive region.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment: a kind of fluid flow of the present embodiment, without magnetic detection device, as shown in Figure 3, comprises LC oscillatory circuit 1, microprocessor unit 2, power control circuit 3, excitation control circuit 4, LC oscillation detection circuit 5, envelope detection circuit 6 and trigger circuit 7.The first output terminal of microprocessor unit 2 is connected with the input end of power control circuit 3, the second output terminal of microprocessor unit 2 is connected with the input end of excitation control circuit 4, the output terminal of power control circuit 3, excitation control circuit 4 is connected with the two ends of LC oscillatory circuit 1 respectively, the oscillation output end of LC oscillatory circuit 1 is connected with the input end of envelope detection circuit 6, the output terminal of envelope detection circuit 6 is connected with the input end of trigger circuit 7, and the timer capture input end of the output terminal of trigger circuit 7 and microprocessor unit 2 is connected.As shown in Figure 5, LC oscillatory circuit 1 is arranged on impeller 8 tops of liquid meter, and impeller 8 is towards the one side of LC oscillatory circuit 1, and half is the insulating regions 9 that insulating material is made, and second half is the conductive region 10 that is covered with metallic copper.
As shown in Figure 4, power control circuit 3 comprises resistance R 1 and triode T1, excitation control circuit 4 comprises resistance R 3, resistance R 5, capacitor C 3 and triode T3, LC oscillation detection circuit 5 comprises resistance R 4, capacitor C 2 and triode T2, envelope detection circuit 6 comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5 and diode D, and trigger circuit 7 are not gate U.One end of resistance R 1, one end of resistance R 3 respectively with the first output terminal PowerSNR of microprocessor unit 2, the second output terminal DriveSNR is connected, the other end of resistance R 1 is connected with the base stage of triode T1, the other end of resistance R 3 is connected with the base stage of triode T3 through capacitor C 3, the emitter of triode T1 meets voltage VCC, the collector of triode T1 is connected with one end of the parallel circuit of inductance L 1 with the capacitor C 1 that forms LC oscillatory circuit 1 through resistance R 2, the collector of another termination triode T3 of this parallel circuit, the grounded emitter of triode T3, resistance R 5 is connected between the base stage of triode T3 and the emitter of triode T3, capacitor C 2 and resistance R 4 parallel connections, one end of this parallel circuit is connected with the collector of triode T3, the other end of this parallel circuit is connected with the base stage of triode T2, the emitter of triode T2 and capacitor C 1, the also contact of inductance L 1 and resistance R 2 is connected, the collector of triode T2 is connected with the positive pole of diode D, resistance R 6 and capacitor C 4 parallel connections, one end of this parallel circuit is connected with the positive pole of diode D, the other end ground connection of this parallel circuit, resistance R 7 and capacitor C 5 parallel connections, one end of this parallel circuit is connected with the negative pole of diode D, the other end ground connection of this parallel circuit, the negative pole of diode D is connected with the input end of not gate U, the timer capture input end OutSNR of the output terminal of not gate U and microprocessor unit 2 is connected.In the present embodiment, microprocessor unit 2 adopts STM8L052 chip microcontroller.
Testing process:
1. the first output terminal PowerSNR output low level signal of microprocessor unit, to resistance R 1, makes triode T1 conducting, realizes power supply; The high level pulse signal that the second output terminal DriveSNR output time of microprocessor unit is 1 μ s is to resistance R 3, within this time, and triode T3 conducting, excitation control circuit encourages control, makes LC oscillatory circuit carry out the charging of 1 μ s time;
2. LC oscillatory circuit completes after the charging of 1 μ s time, the second output terminal DriveSNR of microprocessor unit becomes low level, triode T3 cut-off, LC oscillatory circuit starting oscillation now, output waveform is to the input end of LC oscillation detection circuit, LC oscillation detection circuit extracts in waveform the part higher than setting voltage, through envelope detection circuit, process again, waveform after processing is flowed to the input end of not gate U, after not gate U shaping output with the waveform signal of one section of DC waveform the timer capture input end OutSNR to microprocessor unit;
When LC oscillatory circuit is positioned at the insulating regions top of impeller, as shown in Figure 6, top is the input waveform of not gate U, and bottom is the output waveform of not gate U; When LC oscillatory circuit is positioned at the conductive region top of impeller, as shown in Figure 7, top is the input waveform of not gate U, and bottom is the output waveform of not gate U;
3. the timer capture input end OutSNR of microprocessor unit receives the waveform signal that not gate U sends, and carries out timer capture, obtains the shared time △ of the DC waveform comprising in waveform signal T; As the value of catching △ T > T2b-
time, microprocessor unit is judged as the below that insulating regions on impeller rotates to LC oscillatory circuit, as the value of catching △ T < T2a+
time, microprocessor unit is judged as the below that conductive region on impeller rotates to LC oscillatory circuit, wherein, T3=T2b-T2a, T2b is insulating regions when top that LC oscillatory circuit is positioned at impeller, the end time of the DC waveform of trigger circuit output, T2a is LC oscillatory circuit while being positioned at the conductive region top of impeller, the end time of the DC waveform of trigger circuit output; Finally by microprocessor unit, according to the change in location of insulating regions and conductive region, calculated the fluid flow that flows through liquid meter, realize the measurement of fluid flow.
Claims (5)
1. a fluid flow is without magnetic detection device, the LC oscillatory circuit (1) that comprises impeller (8) top that is arranged on liquid meter, impeller (8) is towards the one side of LC oscillatory circuit (1), half is the insulating regions (9) that insulating material is made, second half is the conductive region (10) that conductive material is made, characterized by further comprising microprocessor unit (2), power control circuit (3), excitation control circuit (4), LC oscillation detection circuit (5), envelope detection circuit (6) and trigger circuit (7), the input end of the first output terminal of described microprocessor unit (2) and described power control circuit (3) is connected, the input end of the second output terminal of microprocessor unit (2) and described excitation control circuit (4) is connected, power control circuit (3), the output terminal of excitation control circuit (4) is connected with the two ends of described LC oscillatory circuit (1) respectively, the input end of the oscillation output end of LC oscillatory circuit (1) and described envelope detection circuit (6) is connected, the input end of the output terminal of envelope detection circuit (6) and described trigger circuit (7) is connected, the timer capture input end of the output terminal of trigger circuit (7) and described microprocessor unit (2) is connected.
2. a kind of fluid flow according to claim 1 is without magnetic detection device, it is characterized in that described power control circuit (3) comprises resistance R 1 and triode T1, described excitation control circuit (4) comprises resistance R 3, resistance R 5, capacitor C 3 and triode T3, and described LC oscillation detection circuit (5) comprises resistance R 4, capacitor C 2 and triode T2, one end of resistance R 1, one end of resistance R 3 respectively with the first output terminal of described microprocessor unit (2), the second output terminal is connected, the other end of resistance R 1 is connected with the base stage of triode T1, the other end of resistance R 3 is connected with the base stage of triode T3 through capacitor C 3, the emitter of triode T1 meets voltage VCC, the collector of triode T1 is connected with one end of the parallel circuit of inductance L 1 with the capacitor C 1 that forms LC oscillatory circuit (1) through resistance R 2, the collector of another termination triode T3 of this parallel circuit, the grounded emitter of triode T3, resistance R 5 is connected between the base stage of triode T3 and the emitter of triode T3, capacitor C 2 and resistance R 4 parallel connections, one end of this parallel circuit is connected with the collector of triode T3, the other end of this parallel circuit is connected with the base stage of triode T2, the emitter of triode T2 is connected with the also contact of capacitor C 1, inductance L 1 and resistance R 2, and the collector of triode T2 is connected with the input end of described envelope detection circuit (6).
3. a kind of fluid flow according to claim 1 and 2 is without magnetic detection device, it is characterized in that described envelope detection circuit (6) comprises resistance R 6, resistance R 7, capacitor C 4, capacitor C 5 and diode D, the output terminal of described LC oscillation detection circuit (5) is connected with the positive pole of diode D, resistance R 6 and capacitor C 4 parallel connections, one end of this parallel circuit is connected with the positive pole of diode D, the other end ground connection of this parallel circuit, resistance R 7 and capacitor C 5 parallel connections, one end of this parallel circuit is connected with the negative pole of diode D, the other end ground connection of this parallel circuit, the negative pole of diode D is connected with the input end of described trigger circuit (7).
4. a kind of fluid flow according to claim 1 and 2 is without magnetic detection device, it is characterized in that described trigger circuit (7) are not gate U, the input end of not gate U is connected with the output terminal of described envelope detection circuit (6), and the output terminal of not gate U is connected with the timer capture input end of described microprocessor unit (2).
5. a kind of fluid flow according to claim 3 is without magnetic detection device, it is characterized in that described trigger circuit (7) are not gate U, the input end of not gate U is connected with the negative pole of diode D, and the output terminal of not gate U is connected with the timer capture input end of described microprocessor unit (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201320517515.XU CN203414122U (en) | 2013-08-22 | 2013-08-22 | Liquid flow non-magnetic detecting device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320517515.XU CN203414122U (en) | 2013-08-22 | 2013-08-22 | Liquid flow non-magnetic detecting device |
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| CN203414122U true CN203414122U (en) | 2014-01-29 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575340A (en) * | 2013-08-22 | 2014-02-12 | 浙江利尔达物联网技术有限公司 | Liquid flow non-magnetic detector and detection method thereof |
| RU2602401C1 (en) * | 2015-09-02 | 2016-11-20 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Академия Федеральной службы охраны Российской Федерации" (Академия ФСО России) | Method of measuring fluid flow rate |
| CN113899298A (en) * | 2021-10-15 | 2022-01-07 | 济南瑞泉电子有限公司 | Inductance position sensing device based on phase shift sine and cosine double-circuit voltage detection |
-
2013
- 2013-08-22 CN CN201320517515.XU patent/CN203414122U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103575340A (en) * | 2013-08-22 | 2014-02-12 | 浙江利尔达物联网技术有限公司 | Liquid flow non-magnetic detector and detection method thereof |
| CN103575340B (en) * | 2013-08-22 | 2016-04-06 | 浙江利尔达物联网技术有限公司 | Liquid flow non-magnetic detector and detection method thereof |
| RU2602401C1 (en) * | 2015-09-02 | 2016-11-20 | Федеральное государственное казенное военное образовательное учреждение высшего образования "Академия Федеральной службы охраны Российской Федерации" (Академия ФСО России) | Method of measuring fluid flow rate |
| CN113899298A (en) * | 2021-10-15 | 2022-01-07 | 济南瑞泉电子有限公司 | Inductance position sensing device based on phase shift sine and cosine double-circuit voltage detection |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191210 Address after: Room 1301, building 1, No. 1326, Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: HANGZHOU GREEN WHALE TECHNOLOGY Co.,Ltd. Address before: Yuhang District, Hangzhou City, Zhejiang Province, 310000 West No. 1500 Building No. 1 room 105 Patentee before: ZHEJIANG LIERDA INTERNET OF THINGS TECHNOLOGY Co.,Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20140129 |