CN200986461Y - Intelligent capacitance type liquid level measuring apparatus - Google Patents

Intelligent capacitance type liquid level measuring apparatus Download PDF

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Publication number
CN200986461Y
CN200986461Y CN 200620062253 CN200620062253U CN200986461Y CN 200986461 Y CN200986461 Y CN 200986461Y CN 200620062253 CN200620062253 CN 200620062253 CN 200620062253 U CN200620062253 U CN 200620062253U CN 200986461 Y CN200986461 Y CN 200986461Y
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CN
China
Prior art keywords
circuit
processing unit
central processing
level measuring
measuring instrument
Prior art date
Application number
CN 200620062253
Other languages
Chinese (zh)
Inventor
洪添胜
刘志壮
张文昭
李震
张俊林
刑志卿
李加念
Original Assignee
华南农业大学
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Priority to CN 200620062253 priority Critical patent/CN200986461Y/en
Application granted granted Critical
Publication of CN200986461Y publication Critical patent/CN200986461Y/en

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Abstract

The utility model provides an intelligent capacitive liquid level gauge, and comprises a capacitive transducer (A) and a signal processing device (B). An output end of the capacitive transducer (A) is connected with an input end of the signal processing device (B). The signal processing device (B) comprises a power supply circuit (7), a communication circuit (8), a capacitive frequency conversion circuit (10), a central processing unit (11), and a display circuit (12). An input end of the capacitive frequency conversion circuit (10) is connected with an output end of the capacitive transducer (A). An output end of the frequency conversion circuit (10) is connected with an input interface of the central processing unit (11). An output interface of the central processing unit (11) is connected with the display circuit (12). The utility model coverts change of capacitance into frequency change through the capacitive frequency conversion circuit; then the central processing unit is used to measure frequency and then height is calculated through software equations. The digital temperature sensor is adopted to measure the temperature, and then the measured temperature is compensated and corrected in segments through the software equations of the central processing unit; finally, liquid level height is displayed on the display circuit.

Description

The intelligent capacitance fluid level measuring instrument

Technical field:

The utility model is a kind of capacitance type liquid level measuring instrument, and particularly a kind of real-time level pick-up unit that detects motion such as vehicular spraying machine, automotive oil tank, warehouse paint case or static opaque transparent liquid case belongs to the renovation technique of capacitance type liquid level measuring instrument.

Background technology:

In numerous occasions, motion or static opaque transparent liquid case are carried out the real-time level supervision and controlled extremely important.The structure and the kind of the existing liquid level instrument that is used to detect liquid case liquid level are various, mainly contain float type, ultrasonic type and vapour-pressure types such as floatage-type, float-type, floating-type and gravity type from big class, but ubiquitous shortcoming is a function singleness, intelligent degree is low, there is not the configuration communication interface, can not realize remote monitoring, and the situation of element function drift can appear in long-term use, so that directly cause measuring accuracy to descend.

The utility model content:

The purpose of this utility model is to overcome above-mentioned shortcoming and a kind of communication interface that has is provided, and can realize remote monitoring, and can avoid occurring using for a long time the problem of element function drift, guarantees the intelligent capacitance fluid level measuring instrument of measuring accuracy.

Structural representation of the present utility model as shown in Figure 1, include capacitive transducer (C) and signal processing apparatus (D) thereof, the output terminal of capacitive transducer (C) is connected with the input end of signal processing apparatus (D), wherein signal processing apparatus (D) includes power circuit (7), telecommunication circuit (8), electric capacity freq converting circuit (10), CPU (central processing unit) (11), display circuit (12), wherein the input end of electric capacity freq converting circuit (10) is connected with the signal output part of capacitive transducer (C), the output terminal of freq converting circuit (10) is connected with the input interface of CPU (central processing unit) (11) by telecommunication circuit (8), and the output interface of CPU (central processing unit) (11) is connected with display circuit (12).

Said signal processing device (D) also includes temperature sensing circuit (9), the temp probe of temperature sensing circuit (9) places in the testing liquid, the output terminal of temperature sensing circuit (9) is connected with the input interface of CPU (central processing unit) (11) by telecommunication circuit (8), and the output interface of CPU (central processing unit) (11) is connected with display circuit (12).

Above-mentioned CPU (central processing unit) (11) is a single-chip microcomputer.

The output terminal of above-mentioned CPU (central processing unit) (11) also is connected with warning driving circuit (13).

The input end of above-mentioned CPU (central processing unit) (11) also is connected with button inputting circuits (14).

Above-mentioned capacitive transducer (C) is a concentric circles pillar capacitive transducer, include inner core (1), urceolus (2), upper end insulated terminal (3), lower end insulated terminal (4), connecting line (5), inner core (1) is nested with forms concentric cylinder in urceolus (2), on inner core (1) and the urceolus (2), following two ends have been fixed with the upper end insulated terminal (3) and the lower end insulated terminal (4) of fixation respectively, and upper end insulated terminal (3) and lower end insulated terminal (4) all have and can allow slowly the come in and go out aperture of the cavity between inner core (1) and urceolus (2) of testing liquid (6), connecting line (5) is a single-core shielding line, its center is connected with inner core (1), and its outside line is connected with urceolus (2).

Above-mentioned inner core (1) is the metal inner core, and its outside surface scribbles insulating paint; Or be the middle plastic tube that metal sandwich is arranged.

Above-mentioned urceolus (2) is a metal outer cylinder, and its outside surface scribbles insulating paint.

Above-mentioned electric capacity freq converting circuit (10) includes 555 timing chips and peripheral resistance (R1, R2) thereof, electric capacity (C1, C2, C13).

Above-mentioned single-chip microcomputer is 51 series or AVR series monolithic, and telecommunication circuit (8) adopts RS232 or RS485 interface; Display circuit (12) is the LCD display circuit.

The utility model is because the structure that adopts the output terminal of capacitive transducer to be connected with the input end of signal processing apparatus, wherein signal processing apparatus includes power circuit, telecommunication circuit, electric capacity freq converting circuit, CPU (central processing unit), display circuit, and the utility model is converted to frequency change by the electric capacity freq converting circuit with capacitance variations; Utilize the CPU (central processing unit) survey frequency again, by software formula computed altitude; Adopt the digital temperature sensor detected temperatures, by the compensation of software formula and the segmentation correction of CPU (central processing unit), on display circuit, show liquid level at last again.Intelligent capacitance liquid level instrument of the present utility model has temperature compensation, software correction, machinery and goes characteristics such as liquid fluctuating, user's self-correcting, also has overload alarm and serial communication function.This liquid level instrument hardware circuit is reliable, stable performance; Software design is reasonable, and formula calculates liquid level, the measuring accuracy height, and the linearity is good, is a kind of rational in infrastructure, function admirable, convenient and practical intelligent capacitance fluid level measuring instrument.

Description of drawings:

Fig. 1 is the structural representation of the utility model capacitive transducer (A);

Fig. 2 is the hardware circuit principle figure of the utility model signal processing apparatus (B);

Fig. 3 is the utility model software main program process flow diagram;

Fig. 4 is the utility model user self-correcting subroutine flow chart;

Fig. 5 is the utility model serial ports interrupt routine process flow diagram;

Fig. 6 is the utility model level gauging subroutine flow chart;

Fig. 7 is the utility model frequency measurement subroutine flow chart.

Embodiment:

Embodiment:

The utility model includes capacitive transducer C and signal processing apparatus D thereof, the structural representation of capacitive transducer C as shown in Figure 1, the hardware circuit principle figure of the utility model signal processing apparatus D as shown in Figure 2, the output terminal of capacitive transducer C is connected with the input end of signal processing apparatus D, wherein signal processing apparatus D includes power circuit 7, telecommunication circuit 8, electric capacity freq converting circuit 10, CPU (central processing unit) 11, display circuit 12, wherein the input end of electric capacity freq converting circuit 10 is connected with the signal output part of capacitive transducer A, the output terminal of freq converting circuit 10 is connected with the input interface of CPU (central processing unit) 11 by telecommunication circuit 8, and the output interface of CPU (central processing unit) 11 is connected with display circuit 12.

In the present embodiment, said signal processing device D also includes temperature sensing circuit 9, the temp probe of temperature sensing circuit 9 places in the testing liquid, the output terminal of temperature sensing circuit 9 is connected with the input interface of CPU (central processing unit) 11 by telecommunication circuit 8, and the output interface of CPU (central processing unit) 11 is connected with display circuit 12.

Above-mentioned power circuit 7 usefulness L7805 voltage stabilizings are to 5V, and CPU (central processing unit) 11 is a single-chip microcomputer, and single-chip microcomputer is 51 series or AVR series monolithic, and telecommunication circuit 8 adopts RS232 or RS485 interface; Display circuit 12 is the LCD display circuit.Above-mentioned electric capacity freq converting circuit 10 includes 555 timing chips and peripheral resistance R 1 thereof, R2, capacitor C 1, C2, C13.In the present embodiment, telecommunication circuit 8 is RS232.Temperature sensing circuit 9 usefulness DS1820 make temp probe.2 of the A of electric capacity freq converting circuit 10 and B meet capacitive transducer A, and when electric capacitance change, 555 oscillatory circuits convert thereof into frequency change.Single-chip microcomputer 11 is the AVR single-chip microcomputer, adopts Mega8, and this chip has the E of 8Kbyte 2PROM and I 2CEPROM, program and the user data chip internal that can write direct; The single-chip microcomputer major function is to detect frequency and temperature, utilizes the computed in software liquid level, the temperature correction, and linearity correction, output show and report to the police.The mode and the single-chip microcomputer of LCD display circuit 12 usefulness four figures certificates join.

In addition, use for ease of the user, the output terminal of above-mentioned CPU (central processing unit) 11 also is connected with warning driving circuit 13.The input end of above-mentioned CPU (central processing unit) 11 also is connected with button inputting circuits 14.

The utility model capacitive transducer C adopts the concentric cylindrical electric capacity with buffering liquid fluctuating, include inner core 1, urceolus 2, upper end insulated terminal 3, lower end insulated terminal 4, connecting line 5, inner core 1 is nested with forms concentric cylinder in urceolus 2, on inner core 1 and the urceolus 2, following two ends have been fixed with the upper end insulated terminal 3 and the lower end insulated terminal 4 of fixation respectively, and upper end insulated terminal 3 and lower end insulated terminal 4 all have and can allow slowly the come in and go out aperture of the cavity between inner core 1 and urceolus 2 of testing liquid 6, aperture can allow liquid slowly come in and go out, when the outside liquid level slowly changes, liquid level between the tube is in company with variation, when the liquid fluctuation of outside, aperture plays buffer action, and liquid changes very little in the tube.Connecting line 5 is a single-core shielding line, and its center is connected with inner core 1, and its outside line is connected with urceolus 2, and A, B 2 points of the center of connecting line 5 and outside line difference map interlinking 2 medium frequency change-over circuits 10.

In the present embodiment, above-mentioned inner core 1 is the metal inner core, and its outside surface scribbles insulating paint; Or be the middle plastic tube that metal sandwich is arranged.Above-mentioned urceolus 2 is a metal outer cylinder, and its outside surface scribbles insulating paint.

The utility model is converted to frequency change by the electric capacity freq converting circuit with capacitance variations; Utilize measuring frequency of single-chip again, by software formula computed altitude; Adopt digital temperature sensor DS18B20 detected temperatures, by compensation of software formula and segmentation correction, on LCD, show liquid level at last again.

Claims (10)

1, a kind of intelligent capacitance fluid level measuring instrument, include capacitive transducer (C) and signal processing apparatus (D) thereof, the output terminal of capacitive transducer (C) is connected with the input end of signal processing apparatus (D), it is characterized in that signal processing apparatus (D) includes power circuit (7), telecommunication circuit (8), electric capacity freq converting circuit (10), CPU (central processing unit) (11), display circuit (12), wherein the input end of electric capacity freq converting circuit (10) is connected with the signal output part of capacitive transducer (C), the output terminal of freq converting circuit (10) is connected with the input interface of CPU (central processing unit) (11) by telecommunication circuit (8), and the output interface of CPU (central processing unit) (11) is connected with display circuit (12).
2, intelligent capacitance fluid level measuring instrument according to claim 1, it is characterized in that said signal processing device (D) also includes temperature sensing circuit (9), the temp probe of temperature sensing circuit (9) places in the testing liquid, the output terminal of temperature sensing circuit (9) is connected with the input interface of CPU (central processing unit) (11) by telecommunication circuit (8), and the output interface of CPU (central processing unit) (11) is connected with display circuit (12).
3, intelligent capacitance fluid level measuring instrument according to claim 1 is characterized in that above-mentioned CPU (central processing unit) (11) is single-chip microcomputer.
4, intelligent capacitance fluid level measuring instrument according to claim 1 is characterized in that the output terminal of above-mentioned CPU (central processing unit) (11) also is connected with warning driving circuit (13).
5, intelligent capacitance fluid level measuring instrument according to claim 1 is characterized in that the input end of above-mentioned CPU (central processing unit) (11) also is connected with button inputting circuits (14).
6, according to each described intelligent capacitance fluid level measuring instrument of claim 1 to 5, it is characterized in that above-mentioned capacitive transducer (C) is a concentric circles pillar capacitive transducer, include inner core (1), urceolus (2), upper end insulated terminal (3), lower end insulated terminal (4), connecting line (5), inner core (1) is nested with forms concentric cylinder in urceolus (2), on inner core (1) and the urceolus (2), following two ends have been fixed with the upper end insulated terminal (3) and the lower end insulated terminal (4) of fixation respectively, and upper end insulated terminal (3) and lower end insulated terminal (4) all have and can allow slowly the come in and go out aperture of the cavity between inner core (1) and urceolus (2) of testing liquid (6), connecting line (5) is a single-core shielding line, its center is connected with inner core (1), and its outside line is connected with urceolus (2).
7, intelligent capacitance fluid level measuring instrument according to claim 6 is characterized in that above-mentioned inner core (1) is the metal inner core, and its outside surface scribbles insulating paint; Or be the middle plastic tube that metal sandwich is arranged.
8, intelligent capacitance fluid level measuring instrument according to claim 7 is characterized in that above-mentioned urceolus (2) is a metal outer cylinder, and its outside surface scribbles insulating paint.
9, intelligent capacitance fluid level measuring instrument according to claim 8 is characterized in that above-mentioned electric capacity freq converting circuit (10) includes 555 timing chips and peripheral resistance (R1, R2) thereof, electric capacity (C1, C2, C13).
10, intelligent capacitance fluid level measuring instrument according to claim 3 is characterized in that above-mentioned single-chip microcomputer is 51 series or AVR series monolithic, and telecommunication circuit (8) adopts RS232 or RS485 interface; Display circuit (12) is the LCD display circuit.
CN 200620062253 2006-07-28 2006-07-28 Intelligent capacitance type liquid level measuring apparatus CN200986461Y (en)

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Application Number Priority Date Filing Date Title
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010133067A1 (en) * 2009-05-21 2010-11-25 晶辉电器(深圳)有限公司 Electronic liquid level detection and display device and application methods thereof
CN101936746A (en) * 2010-08-02 2011-01-05 北京华控技术有限责任公司 Non-electric quantity determination system and method
CN102436012A (en) * 2011-09-06 2012-05-02 深圳市朗石生物仪器有限公司 Device and method for detecting liquid in pipeline
CN102501990A (en) * 2011-10-13 2012-06-20 楚天科技股份有限公司 Liquid level detecting device used for rotary type head tank of large liquid transmission filling machine
CN102720483A (en) * 2012-05-30 2012-10-10 中国石油大学(华东) New method for measuring liquid level of oilwell
CN103323074A (en) * 2013-06-28 2013-09-25 成都众易通科技有限公司 Oil level sensing device
CN103499379A (en) * 2013-10-15 2014-01-08 中国电子科技集团公司第三十八研究所 Fast detection system for amount of stored oil
CN103837170A (en) * 2012-11-28 2014-06-04 常州大学 Automatic frequency compensating circuit and method for frequency output type sensors
TWI476378B (en) * 2013-11-12 2015-03-11 Finetek Co Ltd Level and temperature sensing device
CN108225495A (en) * 2016-12-12 2018-06-29 中国航空工业集团公司西安航空计算技术研究所 A kind of capacitance level transducer on-line measurement system and its method
CN108603782A (en) * 2015-12-24 2018-09-28 埃尔特克有限公司 Horizontal device and method for detecting medium
US10564025B2 (en) 2011-01-25 2020-02-18 Hewlett-Packard Development Company, L.P. Capacitive fluid level sensing

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010133067A1 (en) * 2009-05-21 2010-11-25 晶辉电器(深圳)有限公司 Electronic liquid level detection and display device and application methods thereof
CN101936746B (en) * 2010-08-02 2012-09-05 北京华控技术有限责任公司 Non-electric quantity determination system and method
CN101936746A (en) * 2010-08-02 2011-01-05 北京华控技术有限责任公司 Non-electric quantity determination system and method
US10564025B2 (en) 2011-01-25 2020-02-18 Hewlett-Packard Development Company, L.P. Capacitive fluid level sensing
CN102436012A (en) * 2011-09-06 2012-05-02 深圳市朗石生物仪器有限公司 Device and method for detecting liquid in pipeline
CN102436012B (en) * 2011-09-06 2014-05-07 深圳市朗石生物仪器有限公司 Device and method for detecting liquid in pipeline
CN102501990A (en) * 2011-10-13 2012-06-20 楚天科技股份有限公司 Liquid level detecting device used for rotary type head tank of large liquid transmission filling machine
CN102720483A (en) * 2012-05-30 2012-10-10 中国石油大学(华东) New method for measuring liquid level of oilwell
CN103837170B (en) * 2012-11-28 2016-08-10 常州大学 Rate-adaptive pacemaker class sensor automatic frequency compensation circuit and method
CN103837170A (en) * 2012-11-28 2014-06-04 常州大学 Automatic frequency compensating circuit and method for frequency output type sensors
CN103323074A (en) * 2013-06-28 2013-09-25 成都众易通科技有限公司 Oil level sensing device
CN103499379A (en) * 2013-10-15 2014-01-08 中国电子科技集团公司第三十八研究所 Fast detection system for amount of stored oil
CN103499379B (en) * 2013-10-15 2015-05-27 中国电子科技集团公司第三十八研究所 Fast detection system for amount of stored oil
TWI476378B (en) * 2013-11-12 2015-03-11 Finetek Co Ltd Level and temperature sensing device
CN108603782A (en) * 2015-12-24 2018-09-28 埃尔特克有限公司 Horizontal device and method for detecting medium
CN108225495A (en) * 2016-12-12 2018-06-29 中国航空工业集团公司西安航空计算技术研究所 A kind of capacitance level transducer on-line measurement system and its method

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C14 Grant of patent or utility model
GR01 Patent grant
C17 Cessation of patent right
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20071205

Termination date: 20120728