CN1271582C - Flow detecting and automatic control experiment instrument - Google Patents
Flow detecting and automatic control experiment instrument Download PDFInfo
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- CN1271582C CN1271582C CN 200410068175 CN200410068175A CN1271582C CN 1271582 C CN1271582 C CN 1271582C CN 200410068175 CN200410068175 CN 200410068175 CN 200410068175 A CN200410068175 A CN 200410068175A CN 1271582 C CN1271582 C CN 1271582C
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Abstract
The present invention discloses a flow detection and automatic control laboratory instrument which has an auto-circulation water supply device; a water pump is arranged in the auto-circulation water supply device; the water pump is connected with a pipeline system via a hose; an electromagnetic flow meter, a turbine flow meter, a Venturi flow meter, a perforated plate flow meter, a water level system and a linear motor are orderly connected in series in the pipeline system; the water in a water outlet of the pipeline system returns to the auto-circulation water supply device via a hose; the electromagnetic flow meter, the turbine flow meter, the Venturi flow meter, the perforated plate flow meter and the water level system are connected with a secondary instrument, a flow detection control instrument and a computer via the respective sensors. The present invention belongs to a technique intensive table experiment device and combines the flow detection and automatic control systems in industry with the traditional experiment system of engineering fluid mechanics, which is suitable for the modern teaching requirement. The present invention can synchronously use various flow meters for detection in different flow and has the functions of using the computer to collect data, calibrating the flow and the water level, automatically controlling the flow, etc.
Description
Technical field
The present invention relates to experimental demonstration instrument, relate in particular to a kind of flow detection and automatic control experiment instrument.
Background technology
Detection Technology and Automatic Equipment are parts of autonetics section, it mainly to signal obtain with real-time processing technique, advanced sensor technology, intelligence instrument, measure and control device, new measuring-control system study, development and application.
The Detection Technology and Automatic Equipment specialty is a comprehensive branch of learning that integrates subjects such as physics, mathematics, electronic technology, computer technology and process control technology.The main direction of studying of this subject comprises: advanced sensor technology, intelligence instrument, signal obtain and real-time processing, automatic checkout and control system.
This flow detection is made up of PCL control card, data collecting card, computing machine and control circuit with the control teaching experiment system, realizes control to flow by the valve in the direction switch pipeline of controlling motor.Control is divided into manual control and controls dual mode automatically.Manually control is directly to control the lifting of motor valve and the switch of water pump by control circuit, and control then is the man-machine conversation by computing machine automatically, realizes all controls.The host computer watchdog routine is write with VB6 and is formed.Flow automatic control flow chart such as Fig. 3 of watchdog routine, wherein " first flow " refers to that motor carries out the operation that single step approaches in this scope; " dead band " refers to that system thinks that flow reaches target flow in this error range, and motor is failure to actuate; " pulse width " refers to the motor step-length, and promptly motor is carried out single step and approached when operating the duration in each step in first flow range.Watchdog routine also has functions such as data acquisition, flow calibration, discharge process curve plotting, level measuring, water level control, achievement printing.
Summary of the invention
The purpose of this invention is to provide a kind of flow detection and automatic control experiment instrument.
It has self-circulating water feeder, in self-circulating water feeder, be provided with water pump, water pump joins by flexible pipe and piping system, the interior electromagnetic flowmeter of having connected in proper order of piping system, turbo flow meter, the saturating favourable flow counter of literary composition, orifice flowmeter, water level system and linear electric motors, the water delivering orifice of piping system passes through the flexible pipe backwater to self-circulating water feeder, electromagnetic flowmeter, turbo flow meter, the saturating favourable flow counter of literary composition, orifice flowmeter and water level system are joined by the pickup wire and the secondary instrument of its sensor separately by separately respectively, secondary instrument joins by secondary instrument signal wire and flow detection controller, and the flow detection controller joins by exporting sampled signal line and input control line and computing machine.
Advantage of the present invention:
1) forms the desk-top experimental provision that genus is technology-intensive by electromagnetic flowmeter, whirlpool series pipe and manual automatic switchover controller, computer measurement and control system and the self-loopa water system that flowmeter, the saturating favourable flow counter of literary composition and orifice flowmeter form of sinking; Industrial control system is incorporated in the traditional experiment system of engineering fluid mechanics, is suitable for the modern teaching requirement.
2) can be by to the synchronous detection of various flowmeters under the different flow, and machine shows relatively with screen as calculated, understands the performance of each flowmeter.Can by computer control inflow-rate of water turbine size, and can show the control procedure curve, for the experimental teaching of flow control theory with the man-machine conversation mode.
3) be furnished with computing machine and data acquisition, demarcation and flow automatically control software and hardware, possess that the result shows, printing function.The functions such as automatic switch control that also have flux cumulating, pump;
Description of drawings
Fig. 1 is flow detection and automatic control experiment instrument structural representation;
Fig. 2 is a flow detection controller circuit diagram of the present invention;
Fig. 3 is a flow auto-control software process flow diagram of the present invention.
Embodiment
As shown in Figure 1, flow detection and automatic control experiment instrument have self-circulating water feeder 1, in self-circulating water feeder, be provided with water pump, water pump joins by flexible pipe and piping system 8, the piping system 8 interior electromagnetic flowmeters 2 of having connected in proper order, turbo flow meter 3, the saturating favourable flow counter 4 of literary composition, orifice flowmeter 5, water level system 6 and linear electric motors 7, the water delivering orifice of piping system 8 passes through the flexible pipe backwater to self-circulating water feeder 1, electromagnetic flowmeter 2, turbo flow meter 3, the saturating favourable flow counter 4 of literary composition, orifice flowmeter 5 and water level system 6 are joined with secondary instrument 9 by the pickup wire 12 of its sensor separately by separately respectively, secondary instrument 9 joins by secondary instrument signal wire 13 and flow detection controller 10, and flow detection controller 10 joins by exporting sampled signal line and input control line and computing machine 11.
As shown in Figure 2, one route of 220V power lead is by the power switch K5 of the insurance wire connection flow detection controller front panel of 15A, power switch K5 links to each other with the yellow line of linear electric motors and a pin of water pump socket, another pin of water pump socket links to each other with the output pin of the first solid-state relay G1, the blue or green line of linear electric motors links to each other with the output pin of electric capacity one end and the second solid-state relay G2, the white line of linear electric motors links to each other the first solid-state relay G1 with the output pin of the electric capacity other end and the 3rd solid-state relay G3, another output pin of the second solid-state relay G2 and the 3rd solid-state relay G3 links to each other with another route of 220V power lead; Pin ground connection is born in the input of the first solid-state relay G1, the second solid-state relay G2 and the 3rd solid-state relay G3, the positive pin of the input of the first solid-state relay G1 connects the 3rd group 1,3 pin of the manual change-over switch K1 of flow detection controller front panel, the positive pin of the input of the second solid-state relay G2 by upper limit position switch catcher moving/the 2nd group 1,3 pin of automatic transfer switch K1, the positive pin of the input of the 3rd solid-state relay G3 by the lower position switch catcher moving/the 1st group 1,3 pin of automatic transfer switch K1.The 1st group 2 pin of manual change-over switch K1 connect the industry control card of computing machine and introduce the DO2 pin, the 2nd group 2 pin of manual change-over switch K1 connect the industry control card of computing machine and introduce the DO1 pin, the 3rd group 2 pin of manual change-over switch K1 connect the industry control card of computing machine and introduce the DO0 pin, the 1st group 4 pin of manual change-over switch K1 connect 2 pin of the valve pass button K2 of flow detection controller front panel, the 2nd group 4 pin of manual change-over switch K1 connect 4 pin that valve closes button K2, the 3rd group 4 pin of manual change-over switch K1 connect the pin of the switch pump K4 of flow detection controller front panel, another pin of switch pump K4 connects the valve of flow detection controller front panel and drives 1 of button (K3), the industry control card introducing+5V power supply of 4 pin and computing machine, other has 2 pin that valve closes button K2 to connect 3 pin that button K3 left by valve, and other has 3 pin that valve closes button K2 to connect 2 pin that button K3 left by valve.The first solid-state relay G1 adopts the 25A solid-state relay, and the second solid-state relay G2 and the 3rd solid-state relay G3 adopt the 2A solid-state relay.
As shown in Figure 3, under automatic control state, by " setting flow " button settings system flow value, the current system of system's real-time sampling actual flow value, the absolute value and " the first flow " that then calculate the difference of " setting value " and " real-time sampling flow value (being called for short " sampled value ") " compare, if the absolute value of the difference of " setting value " and " real-time sampling flow value " is more than or equal to " first flow ", then the motor valve is that step-length is carried out corresponding ON/OFF action with " pulse width " of default, otherwise just " setting flow value " absolute value and " dead band " with the difference of " actual flow value " compared, if the absolute value of the difference of " setting flow value " and " actual flow value " is more than or equal to " dead band ", then the motor valve is being 1 second that step-length is carried out the action of corresponding ON/OFF, if the absolute value of the difference of " setting flow value " and " actual flow value " is less than " dead band ", then system thinks that automatic control reaches requirement, and motor no longer moves.Still carry out but detect circulation automatically, any other reason causes the flow system flow conversion to surpass " dead band " scope, and system all will repeat above step.
The course of work of the present invention is:
Electromagnetic flowmeter and the whirlpool flowmeter that sinks adopts up-to-date commercially available prod (25 type), is furnished with the percentages show instrument and the integrating instrument that show direct-reading; Saturating favourable flow counter of literary composition and orifice flowmeter are furnished with the high-quality differential pressure pickup of this chamber development, are furnished with the electric pilot that shows direct-reading.Electric pilot is sent into computing machine with the electric signal of differential pressure pickup after amplifier amplifies simultaneously, by the processing of non-linear parallel processing software, directly fits to flow value by computing machine.
The flow detection controller is to be used for flow, water pump control mode are selected.When switch is tangentially manual, can utilize controller stopping, opening with the size of flow and manually control to water pump; When switch is tangentially automatic, can be by the man-machine conversation mode by computer-implemented automatic control to pump, flow, water level.
Computer system is made up of 586 above computing machines, PCL-711S industry control card and flow detection and system monitoring software.Functions such as system has data acquisition, flow calibration, the demonstration of expression flow, flow accumulation, flow and pump is controlled automatically, discharge process curve plotting, level measuring, water level control, achievement printing.
Experiment content
1) checks whether orifice flowmeter, the civilian pressure reduction output terminal of favourable flow counter thoroughly are connected correctly with differential pressure pickup, and whether high-pressure side is connected to the water inlet pipe with red point of sensor.
2) close the valve of water level input end.
3) change-over switch with the flow detection controller places " manually " state, switches off the pump and power switch.
4) open the total power switch of display instrument, open the power supply of the saturating favourable flow counter of literary composition, orifice flowmeter and three electric pilots of water level.The selector switch K3 of turbo flow meter integrating instrument is got to low six, and selector switch K5 gets to instantaneous, 6 return-to-zero of return-to-zero K switch.Utilize the zeroing turn-knob of electric pilot panel that electric pilot is returned to zero.
5) open computing machine, enter flow detection and control teaching experiment system software (when pipeline underfill current, electromagnetic flowmeter reading genus bigger than normal is normal).
Begin experiment
1) under " manually " state, open the power supply of flow detection controller, the boiling water pump is observed flow detection and the data on flows of controlling in the teaching experiment system software form simultaneously.If the data error of each passage greatly or some channel data is shown as full scale or be zero, please check whether the line of this passage is correct.Confirm that line is correct, data error is still bigger than normal, then rate given data again.
2) data on flows normally can be controlled automatically in the form.The change-over switch of flow detection controller is placed " automatically " state, and the user can set flow, the variation of observing system flow as required.The software detail operations is seen the software operation instruction.
3) the water level experiment please enter into the water level interface, opens the water level water intaking valve, clicks and carries out the control of knob observation fluctuation in stage to system.
Experiment finishes to retreat outflow Detection ﹠ Controling teaching experiment system software, shut down computer successively, water pump, flow detection controller power supply, the change-over switch of flow detection controller is placed " manually " state, close the power supply of the saturating favourable flow counter of literary composition, orifice flowmeter and three electric pilots of water level again, close the general supply of display instrument.
Claims (2)
1, a kind of flow detection and automatic control experiment instrument, it is characterized in that it has self-circulating water feeder (1), in self-circulating water feeder, be provided with water pump, water pump joins by flexible pipe and piping system (8), the interior electromagnetic flowmeter (2) of having connected in proper order of piping system (8), turbo flow meter (3), the saturating favourable flow counter (4) of literary composition, orifice flowmeter (5), water level system (6) and linear electric motors (7), the water delivering orifice of piping system (8) passes through the flexible pipe backwater to self-circulating water feeder (1), electromagnetic flowmeter (2), turbo flow meter (3), the saturating favourable flow counter (4) of literary composition, orifice flowmeter (5) and water level system (6) are joined with secondary instrument (9) by the pickup wire (12) of its sensor separately by separately respectively, secondary instrument (9) joins by secondary instrument signal wire (13) and flow detection controller (10), and flow detection controller (10) joins with computing machine (11) by output sampled signal line and input control line (14).
2. a kind of flow detection according to claim 1 and automatic control experiment instrument, it is characterized in that, the circuit of described flow detection controller (10) is: a route of 220V power lead is by the power switch (K5) of the insurance wire connection flow detection controller front panel of 15A, power switch (K5) links to each other with the yellow line of linear electric motors and a pin of water pump socket, another pin of water pump socket links to each other with an output pin of first solid-state relay (G1), the blue or green line of linear electric motors links to each other with an output pin of electric capacity one end and second solid-state relay (G2), the white line of linear electric motors links to each other first solid-state relay (G1) with an output pin of the electric capacity other end and the 3rd solid-state relay (G3), second solid-state relay (G2) links to each other with another route of 220V power lead with the 3rd solid-state relay (G3) another output pin separately; First solid-state relay (G1), pin ground connection is born in the input of second solid-state relay (G2) and the 3rd solid-state relay (G3), the positive pin of input of first solid-state relay (G1) connect the 3rd group of manual change-over switch (K1) of flow detection controller front panel 1,3 pin, the positive pin of input of second solid-state relay (G2) by upper limit position switch catcher moving/the 2nd group of automatic transfer switch (K1) 1,3 pin, the positive pin of input of the 3rd solid-state relay (G3) by lower position switch catcher moving/the 1st group of automatic transfer switch (K1) 1,3 pin, the 1st group 2 pin of manual change-over switch (K1) connect the industry control card of computing machine (11) and introduce the D02 pin, the 2nd group 2 pin of manual change-over switch (K1) connect the industry control card of computing machine (11) and introduce the D01 pin, the 3rd group 2 pin of manual change-over switch (K1) connect the industry control card of computing machine (11) and introduce the D00 pin, the 1st group 4 pin of manual change-over switch (K1) connect 2 pin of the valve pass button (K2) of flow detection controller front panel, the 2nd group 4 pin of manual change-over switch (K1) connect 4 pin that valve closes button (K2), the 3rd group 4 pin of manual change-over switch (K1) connect a pin of the switch pump (K4) of flow detection controller front panel, another pin of switch pump (K4) connects the valve of flow detection controller front panel and drives 1 of button (K3), the industry control card introducing+5V power supply of 4 pin and computing machine (11), other has 2 pin that valve closes button (K2) to connect 3 pin that button (K3) left by valve, and other has 3 pin that valve closes button (K2) to connect 2 pin that button (K3) left by valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410068175 CN1271582C (en) | 2004-11-10 | 2004-11-10 | Flow detecting and automatic control experiment instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410068175 CN1271582C (en) | 2004-11-10 | 2004-11-10 | Flow detecting and automatic control experiment instrument |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1606045A CN1606045A (en) | 2005-04-13 |
| CN1271582C true CN1271582C (en) | 2006-08-23 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200410068175 Expired - Fee Related CN1271582C (en) | 2004-11-10 | 2004-11-10 | Flow detecting and automatic control experiment instrument |
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| CN (1) | CN1271582C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100451899C (en) * | 2007-10-22 | 2009-01-14 | 哈尔滨工业大学 | Digital type multiple gears synchronous flow-control system |
| CN102352833A (en) * | 2011-08-15 | 2012-02-15 | 浙江大学 | Bus-type intelligentized digitalizer for detecting performances of swimming pool water pump |
| CN105043470A (en) * | 2015-04-30 | 2015-11-11 | 宁波职业技术学院 | Open type flow measurement system device for teaching |
| CN108877429A (en) * | 2018-08-29 | 2018-11-23 | 苏州市格致科教仪器设备制造有限公司 | A kind of hydrodynamics comprehensive experimental device |
| CN113984112B (en) * | 2021-09-30 | 2022-11-01 | 浙江大学台州研究院 | Intelligent automatic testing system for key part performance of toilet |
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| CN1606045A (en) | 2005-04-13 |
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Granted publication date: 20060823 Termination date: 20091210 |