CN102735295A - Liquid flow quantity measurement and control system - Google Patents
Liquid flow quantity measurement and control system Download PDFInfo
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- CN102735295A CN102735295A CN2012102357103A CN201210235710A CN102735295A CN 102735295 A CN102735295 A CN 102735295A CN 2012102357103 A CN2012102357103 A CN 2012102357103A CN 201210235710 A CN201210235710 A CN 201210235710A CN 102735295 A CN102735295 A CN 102735295A
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Abstract
The invention relates to a liquid flow quantity measurement and control system, which is formed by a plurality of flow quantity detection units and a main control unit. The power supply of the system is obtained by half-wave rectification, and the other half wave time is used for communicating through power wires. Each flow quantity detection unit circularly transmits the detection data to the main control unit according to the address order. The system adopts the counting value of the characteristic value of the cyclic wave of the electric network as the time reference of system synchronization.
Description
(1) technical field:
The present invention relates to a kind of fluid flow TT&C system; It is made up of a plurality of flow detection unit and a main control unit; Its power supply adopts half-wave rectification; In addition hemiwave time is used between them through power line communication, and each flow detection unit sends by the sequence of addresses circulation to main control unit and detects data, and system adopts the time reference of the eigenwert count value of grid cyclic wave as system synchronization.
(2) background technology:
Flow is a significant process parameter in the commercial production; In fields such as oil, chemical industry, metallurgy, water conservancies consequence is arranged all. use aspect many and all need flow be measured and control; Economical and easy to install is the basic demand of these controlling units. liquid flow sensor can be measured the instantaneous delivery of various liquid, gas and steam in circular pipe, the rectangular duct exactly; Its output signal has pulse output, and electric current output etc. are multiple.For some more large-scale application systems; Simultaneously the fluid in the multiple-way duct is measured and controlled with regard to needing; It relates to message exchange between the equipment in the system, and modal a kind of communication mode is many slaves of a main frame, adopts the multi-computer communication of RS485, RS232,12C bus between each principal and subordinate's machine; Need with many buses; Message exchange takies a large amount of CPU times and hardware resource since flow measurement to control general place scope all very big, take the least possible port line for some provisional measurements controls with regard to the both sides that require to communicate.The present invention adopts each slave that is articulated on the power lead through the system of power lead to main frame transmission information, and it has characteristics easy and the saving hardware resource.
(3) summary of the invention:
Existing fluid flow TT&C system, its data bus all are the version that adopts many signal wires, and hardware cost is high; The wiring trouble, the independent separately timing of each main frame slave in the system, its cumulative errors very greatly also must constantly be corrected when communication; If the interrupt mode addressing is adopted in the message exchange between the main frame slave, the waste hardware resource is if adopt the inquiry mode addressing; Take a large amount of CPU times, native system has overcome above-mentioned shortcoming.
System is made up of a plurality of flow detection unit and a main control unit; The detection pulse signal of being sent here by flow sensor amplifies through shaping. and be coupled to single-chip microcomputer through photoelectric device and carry out data processing; Single-chip microcomputer makes liquid line realize leading to, closing according to result and flow prevalue control electromagnetic valve switch; And the calculated flow rate integrating with, show that do not establish the flow prevalue is the natural count state if parameters such as instantaneous delivery are delivered to display, the liquid that flows through flowmeter does not have determined value.When liquid passed through sensor with flow Q, producing frequency was the pulse signal of f, and the relation of f and Q is:
f＝K ·Q
K is the meter constant of sensor in the formula. the step-by-step counting that single-chip microcomputer is seen off sensor obtains instantaneous delivery. obtain the flow accumulation value according to calculating then.
Native system relates to a kind of fluid flow TT&C system; It is to be made up of a plurality of flow detection unit and a main control unit; The power supply of each flow detection unit and main control unit is made half-wave rectification by public rectification diode with the mains supply power supply and is obtained, and hemiwave time is used in the system through power line communication in addition; Each flow detection unit and main control unit all begin an eigenwert counting to grid cyclic wave in the system after public power switch is connected; And with the count value of this grid cyclic wave eigenwert time reference as system synchronization, can adopt grid cyclic wave zero crossing counting, because the grid alternating current source frequency is low; And only obtain, therefore have high accuracy and stability in the near zero-crossing point judgement.Each flow detection unit all is equipped with toggle switch and all is provided with own unique address; The transmission that detects data is to preset after calculating by the count value of address and grid cyclic wave eigenwert; Confirm that each flow detection unit sends the time of detecting data to main control unit, this transmitting time is to send by the sequence of addresses circulation, leaves the time of several main control units to flow detection unit sending controling instruction as required therebetween; The flow detection unit adopts inquiry mode to receive in the time of sending controling instruction; And the corresponding relation of the count value of the address of above-mentioned transmitting time and this grid cyclic wave eigenwert is made form be preset in main control unit and each flow detection unit, it is a beginning transmitting time of confirming the count value sign of grid cyclic wave eigenwert by sequence of addresses, each flow detection unit transmitting time non-overlapping copies; Each flow detection unit of each start is read the toggle switch address earlier; The count value of the corresponding cycle eigenwert when obtaining to begin to send of tabling look-up again, the half-wave when the flow detection unit count down to prevalue to the grid cyclic wave eigenwert just begin to send, and each flow detection unit sends to main control unit in order automatically and detects data; Main control unit receives the detection data by presetting the transmitting-receiving time; After all flow detection unit all send and finish, this transmitting-receiving timing unit zero clearing from the beginning circulation transmission again, main control unit is when receiving the detection data; Press the count value identification flow detection unit of grid cyclic wave eigenwert; Do not represent that the corresponding discharge detecting unit does not exist or fault if certain time is detected data, needn't carry out the registration of flow detection unit when therefore starting shooting, main control unit can also extraly send steering orders such as control electromagnetic valve switch to the flow detection unit; When main control unit during to flow detection unit sending controling instruction; The sending controling instruction time of then tabling look-up and selecting one to characterize with the count value of grid cyclic wave eigenwert, come sending controling instruction and flow detection element address, the flow detection unit that is addressed is in each sending controling instruction the time; Receive through inquiry mode; Above-mentioned each transmitting-receiving time only accomplishes in the hemiwave time of grid cyclic wave, only takies a small amount of time of CPU, all is connected to an electronic switch on the passage of its signal transmission of said flow detection unit and main control unit; This electronic switch is only connected when receiving or sending the detection data; Electronic switch always turn-offs at the hemiwave time of electrical network to system power supply, half-wave conducting when transmitting-receiving detects data in addition, and detection data that main control unit will receive and address thereof and time are kept in the storer so that demonstration or take storer away and read and write by host computer.
Native system is made up of following modules:
Public power switch and rectification unit; Half-wave rectification as power switch control and power supply; Rectification unit comprises rectification diode and electronic switch; This electronic switch is by Single-chip Controlling in the control module, and electronic switch is connected other hemiwave time at electrical network to the hemiwave time of system's power supply and turn-offed, and is used to improve security of system;
Main control unit; Constitute by isolating diode, power supply, cycle detection, storer, single-chip microcomputer, electronic switch, signal condition and keyboard display; Be connected at the power supply front end and isolate diode and be used for the isolated DC supply voltage, main control unit is used to receive the detection data of sending the flow detection unit and preserves and to flow detection unit sending controling instruction;
The flow detection unit; Constitute by isolating diode, power supply, cycle detection, storer, toggle switch, single-chip microcomputer, electronic switch, signal condition, flow sensor, signal Processing and driver, solenoid valve; Also be connected to the isolation diode at the power supply front end and be used for the isolated DC supply voltage, the flow detection unit is used for sending detection data and control electromagnetic valve switch to main control unit.
(4) description of drawings:
Fig. 1 is a kind of circuit structure block scheme of fluid flow TT&C system.
(5) embodiment:
A kind of circuit structure block scheme of fluid flow TT&C system is as shown in Figure 1, and it is used for the liquid flow measurement control in liquid handling pond.This system is made up of public power switch 1 and rectification unit 2 and main control unit A, a plurality of flow detection unit B; Rectification unit comprises rectification diode and electronic switch; This electronic switch is by Single-chip Controlling in the control module, and electronic switch is connected other hemiwave time at electrical network to the hemiwave time of system's power supply and turn-offed.Its main control unit A is made up of isolation diode 3, power supply 4, all wave measurements 5, storer 6, single-chip microcomputer 7, electronic switch 8, signal condition 9, keyboard display 10; Wherein isolate diode 3 and be used to block the passage that direct supply high voltage protective signal transmits; Wave measurement 5 was used for that the grid cyclic wave zero cross signal is triggered single-chip microcomputer 7 after shaping and produced interruptions and the grid cyclic wave zero cross signal is counted week; Electronic switch 8 turn-offed in the time beyond the measurement data that the reception measuring unit that makes it to preset under single-chip microcomputer 7 controls is sent; And in the time of connecting, electronic switch still turn-offs in the hemiwave time of system's power supply at electrical network, just conducting of hemiwave time in addition.The flow detection unit B constitutes by isolating diode 13, power supply 14, all wave measurements 15, toggle switch 12, storer 16, single-chip microcomputer 17, electronic switch 18, signal condition 19, driver 20, solenoid valve 21, signal Processing 22, flow sensor 23, and is identical among the effect of wherein isolating diode 13, power supply 14, all wave measurements 15, electronic switch 18 and the main control unit A.The address of each measuring unit B is preset by toggle switch, and the data of detection are sent to main control unit A through electronic switch 18.
The detection pulse signal of being sent here by flow sensor amplifies through shaping. be coupled to the timer/counter input end T1 of single-chip microcomputer 17 through photoelectric device; 89C4051 by single-chip microcomputer 17 carries out data processing; Export steering order then, the controlling liquid pipeline leads to, closes, and the switch controlling signal of solenoid valve 21 is from single-chip microcomputer 17 outputs; Amplify the conducting of triggering bidirectional triode thyristor through driver 20, solenoid valve is opened.
Claims (2)
1. fluid flow TT&C system; It is made up of a plurality of flow detection unit and a main control unit, and the power supply of each flow detection unit and main control unit is made half-wave rectification by public rectification diode with the mains supply power supply and obtained; Hemiwave time is used in the system through power line communication in addition; Each flow detection unit and main control unit all begin an eigenwert counting to grid cyclic wave in the system after public power switch is connected, and with the count value of this grid cyclic wave eigenwert time reference as system synchronization, it is characterized in that; Each flow detection unit all is equipped with toggle switch and all is provided with own unique address; The transmission that detects data is to preset after calculating by the count value of address and grid cyclic wave eigenwert, confirms that each flow detection unit sends the time of detecting data to main control unit, and this transmitting time is to send by the sequence of addresses circulation; Leave the time of several main control units as required therebetween to flow detection unit sending controling instruction; The flow detection unit adopts inquiry mode to receive in the time of sending controling instruction, and the corresponding relation of the address of above-mentioned transmitting time and the count value of this grid cyclic wave eigenwert is made form is preset in main control unit and each flow detection unit, and it is a beginning transmitting time of confirming the count value sign of grid cyclic wave eigenwert by sequence of addresses; Each flow detection unit transmitting time non-overlapping copies; Each flow detection unit of each start is read the toggle switch address earlier, the count value of the corresponding cycle eigenwert when obtaining to begin to send of tabling look-up again, and the half-wave when the flow detection unit count down to prevalue to the grid cyclic wave eigenwert just begins to send; Each flow detection unit sends to main control unit in order automatically and detects data; Main control unit detects data by presetting the reception of transmitting-receiving time, after all flow detection unit all send and finish, and this transmitting-receiving timing unit zero clearing from the beginning circulation transmission again; Main control unit is when receiving the detection data; Press the count value identification flow detection unit of grid cyclic wave eigenwert, when main control unit during to flow detection unit sending controling instruction, the sending controling instruction time of then tabling look-up and selecting one to characterize with the count value of grid cyclic wave eigenwert; Come sending controling instruction and flow detection element address; The flow detection unit that is addressed is in each sending controling instruction the time, receives through inquiry mode, all is connected to an electronic switch on the passage that its signal of said flow detection unit and main control unit transmits; This electronic switch is only connected when detecting data receiving or send, and detection data that main control unit will receive and address thereof and time are kept in the storer so that demonstration or take storer away and read and write by host computer.
2. a kind of Data Detection register system according to claim 1 is characterized in that comprising:
Public power switch and rectification unit; Half-wave rectification as power switch control and power supply; Rectification unit comprises rectification diode and electronic switch; This electronic switch is by Single-chip Controlling in the control module, and electronic switch is connected other hemiwave time at electrical network to the hemiwave time of system's power supply and turn-offed, and is used to improve security of system;
Main control unit; Constitute by isolating diode, power supply, cycle detection, storer, single-chip microcomputer, electronic switch, signal condition and keyboard display; Be connected at the power supply front end and isolate diode and be used for the isolated DC supply voltage, main control unit is used to receive the detection data of sending the flow detection unit and preserves and to flow detection unit sending controling instruction;
The flow detection unit; Constitute by isolating diode, power supply, cycle detection, storer, toggle switch, single-chip microcomputer, electronic switch, signal condition, flow sensor, signal Processing and driver, solenoid valve; Also be connected to the isolation diode at the power supply front end and be used for the isolated DC supply voltage, the flow detection unit is used for sending detection data and control electromagnetic valve switch to main control unit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201210235710 CN102735295B (en) | 2012-06-27 | 2012-06-27 | Liquid flow quantity measurement and control system |
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| CN 201210235710 CN102735295B (en) | 2012-06-27 | 2012-06-27 | Liquid flow quantity measurement and control system |
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| CN102735295A true CN102735295A (en) | 2012-10-17 |
| CN102735295B CN102735295B (en) | 2013-10-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102984866A (en) * | 2012-12-17 | 2013-03-20 | 湖南师范大学 | Intelligent power module for LED lamps, based on electric carrier waves with address control |
| CN103036754A (en) * | 2012-11-22 | 2013-04-10 | 青岛海尔空调电子有限公司 | Communication system and communication method of multi-online air-conditioner |
| CN110875792A (en) * | 2019-11-29 | 2020-03-10 | 东南大学 | Battery management unit sampling and data uploading method based on active synchronization |
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| US5122948A (en) * | 1990-06-28 | 1992-06-16 | Allen-Bradley Company, Inc. | Remote terminal industrial control communication system |
| CN1073272A (en) * | 1991-12-09 | 1993-06-16 | 横河电机株式会社 | Dcs |
| CN102124420A (en) * | 2008-05-09 | 2011-07-13 | 塞甘有限责任公司 | Addressable led light string |
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- 2012-06-27 CN CN 201210235710 patent/CN102735295B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1046822A (en) * | 1989-04-29 | 1990-11-07 | 裴丛国 | Multichannel analog signals circle transmission method and device |
| US5122948A (en) * | 1990-06-28 | 1992-06-16 | Allen-Bradley Company, Inc. | Remote terminal industrial control communication system |
| CN1073272A (en) * | 1991-12-09 | 1993-06-16 | 横河电机株式会社 | Dcs |
| CN102124420A (en) * | 2008-05-09 | 2011-07-13 | 塞甘有限责任公司 | Addressable led light string |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103036754A (en) * | 2012-11-22 | 2013-04-10 | 青岛海尔空调电子有限公司 | Communication system and communication method of multi-online air-conditioner |
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| CN102984866A (en) * | 2012-12-17 | 2013-03-20 | 湖南师范大学 | Intelligent power module for LED lamps, based on electric carrier waves with address control |
| CN110875792A (en) * | 2019-11-29 | 2020-03-10 | 东南大学 | Battery management unit sampling and data uploading method based on active synchronization |
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Effective date of registration: 20160427 Address after: 511495 Guangdong city of Guangzhou province Panyu District Village Street Gaosha industrial district C5 first Patentee after: Guangzhou XISEN automation equipment Co. Ltd Address before: 350004 Fuzhou City, Taijiang province Yi Chau longevity Park, block 401, 8, Patentee before: Zhang Jinmu |