CN202403743U - Flow sensor - Google Patents
Flow sensor Download PDFInfo
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- CN202403743U CN202403743U CN 201120499092 CN201120499092U CN202403743U CN 202403743 U CN202403743 U CN 202403743U CN 201120499092 CN201120499092 CN 201120499092 CN 201120499092 U CN201120499092 U CN 201120499092U CN 202403743 U CN202403743 U CN 202403743U
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Abstract
The utility model discloses a flow sensor, which comprises a power input interface, two capacitors, two magnetic resistance (MR) sensing chips and a signal output interface. The two capacitors are used for preventing interferences, the two capacitances and the two MR sensing chips are connected with two power lines induced by the power input interface respectively, and the two MR sensing chips are respectively connected with the signal output interface which is used for outputting collected signals. The flow sensor has the advantages that the MR sensing chips are rapid in response, stable in signal outputting and capable of enabling the flow sensor to collect flow signals on blades of a fluid flow metering instrument so that the resolution ratio and the accuracy of the metering instrument are greatly increased. The flow sensor is particularly applicable to a rotary wing type fluid flow metering instrument.
Description
Technical field
The utility model relates to a kind of flow sensor that is applied on the rotary wind type fluid metering instrument.
Background technology
The existing flow sensor that is used for the fluid metering instrument, the general flow sensor that adopts based on tongue tube, hall device, Wei root effect device.The fluid of flow-meter of flowing through promotes to have the impeller rotation of magnet steel or magnet ring, and its wheel speed is very fast, and existing flow sensor is gathered very difficulty to the flow signal that impeller produced of high speed rotating.Also there is following deficiency in existing flow sensor: (1) SF is low excessively: usually can not be on impeller the Direct Sampling flow signal; Sample again after reduction gear slows down but impeller linked, cause accuracy of instrument to descend yet the resolution of its instrument is reduced.(2) the sensor power consumption is excessive, can not satisfy the measuring instrument that adopts the powered battery scheme; (3) reliability is low: when flow-meter is measured than low discharge or big flow (impeller is at low speed or high speed rotating), cause flow signal to be lost.(4) serviceable life is low excessively: too high and sampling time of sensor sample frequency scraps because of surpassing its age limit when long.(5) the output signal is hard to manage: the output signal because of the sensor self reason with the random disturbance signal, cause signal of sensor is difficult to handle to cause the measuring instrument precise decreasing.
The utility model content
The purpose of the utility model is to provide a kind of a kind of flow sensor that characteristics such as good reliability, sampling frequency domain are wide, low in energy consumption, long service life can be exported ideal signal that has that can be widely used in rotary wind type fluid metering instrument.
This flow sensor that the utility model provides; Comprise that a power input interface, two are used for jamming-proof electric capacity; Two MR sensing chips, a signal output interface; Said two electric capacity and two MR sensing chips are connected in respectively on two power leads of power input interface introducing, and two MR sensing chips are connected with said signal output interface respectively, with the signal output of gathering.
Said MR sensing chip response frequency is more than 10 KHzs, and supports intermittent power supply power supply mode.
Be separated with mutually between the two MR sensing chips distance and angle is arranged be installed on the pcb board.
The utility model is the pulse signal that is produced by high sensitivity MR sensing chip acquisition stream flowmeter body amount instrument wheel rotation, handles back output reliable signal through chip internal.Because the sensing chip that the utility model adopted is highly sensitive, can sense the changes of magnetic field of absolute value greater than 25 Gausses, make to be widely used in rotary wind type fluid metering instrument; The utility model has adopted novel magnetic induction chip, makes the lifting greatly of sampling frequency domain, reliability and durability strengthens greatly and can sample the flow signal of fluid under each flow point reliably; And the utility model is supported the pulsed intermission power supply method, and make and compare with existing sensors: under same power supply and same SF, the sensor overall power reduces more than 100 times; The magnetosensitive sensing chip that the utility model adopted has characteristics such as response is fast, stable output signal, the flow signal on the feasible directly acquisition stream flowmeter body amount instrument impeller, thus the resolution of instrument and precision are significantly promoted; The utility model is particularly useful for rotary wind type fluid metering instrument.
Description of drawings
Fig. 1 is the theory diagram of the utility model.
Fig. 2 the utility model application principle figure.
Fig. 3 is the signal graph of impeller the utility model output when clockwise rotating.
Fig. 4 is the signal graph of impeller the utility model output when rotating counterclockwise.
Embodiment
Fig. 1 the utility model theory diagram can be found out from this figure, and the utility model comprises power input interface, is used for jamming-proof electric capacity, two MR sensing chip: A and B, a signal output interface.After the power supply of the utility model filters high frequency interference by the power interface input through two ceramic condensers; Supply with two MR sensing chips and make its chip operate as normal, the flow signal that two MR sensing chips will be sensed is separately exported by signal output interface after treatment.The MR sensing chip principle of work that the utility model adopted is as shown in the figure; The MR inductance bridge is sensed faint flow signal; After signal amplifier amplifies; After converting digital pulse signal to by the comparer of band Schmidt output, deliver to OCL at last through the driving gate processing of circuit again and drive the flow signal that output was stable, load capacity is strong after output circuit carried out power amplification.
Why the utility model can realize low-power consumption; Be because adopted the novel MR sensing chip of supporting the pulsed intermittent power supply; Its opening time (TAW), I was reduced to 1Us; If (Period=1mS), the utility model is worked its power consumption less than 0.03Mw under the 3V power supply so to adopt frequency to be 1000 hertz.
Fig. 2 is the utility model application principle figure; The impeller rotation of the utility model fluid propelling fluid measuring instrument in reality is used; Magnet ring on its impeller or magnet steel be rotation and produce the magnetic field of a variation around the magnet thereupon also, and the utility model is sensed the digital pulse signal of one group of band impeller sense of rotation characteristic of output after its changes of magnetic field.Two MR sensing chips 1 are installed on the pcb board 2 among the figure, and a segment distance and an angle are arranged between these two MR sensing chips.The below of pcb board is that magnet steel 3 is housed above the impeller, and two MR sensing chips 1 are as shown in Figure 3 through the signal of signal output interface output when impeller clockwise rotates, and the signal of signal output interface output is as shown in Figure 4 when impeller rotates counterclockwise.Installation site between two MR sensing chips makes the utility model can differentiate the flow direction of the fluid metering instrument of flowing through.
As shown in the figure; The impeller rotation of the utility model fluid propelling fluid measuring instrument in reality is used; Magnet ring on its impeller or magnet steel be rotation and produce the magnetic field of a variation around the magnet thereupon also, and the utility model is sensed the digital pulse signal of one group of band impeller sense of rotation characteristic of output after its changes of magnetic field.Why the utility model can differentiate the flow direction of the fluid metering instrument of flowing through.
Claims (3)
1. flow sensor; It is characterized in that this sensor comprises that a power input interface, two are used for jamming-proof electric capacity; Two MR sensing chips, a signal output interface; Said two electric capacity and two MR sensing chips are connected in respectively on two power leads of power input interface introducing, and two MR sensing chips are connected with said signal output interface respectively, with the signal output of gathering.
2. flow sensor according to claim 1 is characterized in that said MR sensing chip response frequency is more than 10 KHzs, and supports intermittent power supply power supply mode.
3. flow sensor according to claim 1 and 2, it is characterized in that being separated with mutually between the two MR sensing chips distance and angle is arranged be installed on the pcb board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120499092 CN202403743U (en) | 2011-12-05 | 2011-12-05 | Flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120499092 CN202403743U (en) | 2011-12-05 | 2011-12-05 | Flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202403743U true CN202403743U (en) | 2012-08-29 |
Family
ID=46701385
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120499092 Expired - Lifetime CN202403743U (en) | 2011-12-05 | 2011-12-05 | Flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202403743U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949726A (en) * | 2015-06-25 | 2015-09-30 | 成都千嘉科技有限公司 | Magnetic inductive character wheel direct reading device |
| CN105136215A (en) * | 2015-08-26 | 2015-12-09 | 北京云网天成科技有限公司 | Device and method for measuring fluid direction |
| CN114877956A (en) * | 2022-05-31 | 2022-08-09 | 浙江威星智能仪表股份有限公司 | Electromechanical separation intelligent water meter |
-
2011
- 2011-12-05 CN CN 201120499092 patent/CN202403743U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104949726A (en) * | 2015-06-25 | 2015-09-30 | 成都千嘉科技有限公司 | Magnetic inductive character wheel direct reading device |
| CN105136215A (en) * | 2015-08-26 | 2015-12-09 | 北京云网天成科技有限公司 | Device and method for measuring fluid direction |
| CN114877956A (en) * | 2022-05-31 | 2022-08-09 | 浙江威星智能仪表股份有限公司 | Electromechanical separation intelligent water meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120829 |
|
| CX01 | Expiry of patent term |