CN100577254C - Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator - Google Patents
Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator Download PDFInfo
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- CN100577254C CN100577254C CN200710071923A CN200710071923A CN100577254C CN 100577254 C CN100577254 C CN 100577254C CN 200710071923 A CN200710071923 A CN 200710071923A CN 200710071923 A CN200710071923 A CN 200710071923A CN 100577254 C CN100577254 C CN 100577254C
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Abstract
The invention provides an intelligent detection alarm system for the jam of the air filter box of large air-cooled generator. The present product has the defects that the filter box can be jammed by dust and foreign matters, so that the pressure difference between the inside and the outside is increased, the air supplement volume is decreased, and the cooling effect of the generator turns poor. The alarm system of the invention includes a dynamic sampling probe (1), which is connected with a negative pressure chamber of a micro differential pressure transmitter(5), the micro differential pressure transmitter is connected with a DC power supply (6). The micro differential pressure transmitter changes the differential pressure between a positive pressure chamber and the negative pressure chamber into a linear standard current signal, and inputs the standard current signal representing the amount of the differential pressure into an intelligent control unit (7) through a circuit. The intelligent control unit quantifies the standard current signal into a digital signal, compares the digital signal with a set value and sends off an alarm signal, and prompts a watcher to replace the filtering sponge and the desiccant material timely so as to avoid machine halt and other major accidents. The product of the invention is an intelligent jam detecting and alarming device used in the air filter box of large air-cooled generator.
Description
Technical field:
The present invention relates to use on a kind of air filtering case of large-scale air cooling generator, Intelligent Measurement stopping state and the equipment of in time reporting to the police belong to the electromechanical intelligent device.
Background technology:
The air cycle cool ing system that the air cooling system of large-scale air cooling generator is made up of generator rotating blading air intake vent, generator inside (rotor and stator) circulation cooling air channel, generator pit air outlet, aerial cooler, wind-supplying mouth etc.The course of work is: the rotating blading of generator rotating blading air intake vent will be lower than 40 ℃ cold wind and be blown into generator inside, cold wind flows along the cooling air channel of rotor and stator, heat taken out of from the generator pit air outlet becomes 60 ℃---80 ℃ hot blast, be brought down below 40 ℃ cold wind through aerial cooler again, the a small amount of workplace air that enters with wind-supplying mouth (20 ℃---30 ℃) mixes then, enters generator rotating blading air intake vent and is blown into generator inside with the cold wind that still is lower than 40 ℃ again.Outside the circulation cooling air channel of generator inside (rotor and stator), form generator air outside circulation air path (seeing Fig. 1 for details) by generator pit air outlet, aerial cooler, wind-supplying mouth, generator rotating blading air intake vent.Under the driving of generator rotating blading, the outside factory building of air circulation channel and wind-supplying mouth space forms negative pressure, so workplace air constantly enters air circulation channel to replenish the air quantity of leakage that air cycle cool ing system is rushed down by wind-supplying mouth.Air filtering box is installed at the wind-supplying mouth place, workplace air is replenished after the dedusting dehumidifying again enter air circulation channel, enters generator with the air that guarantees clean dried.The difference of air filtering box external pressure and air circulation channel internal pressure is general to be required to about 20KPa; could satisfy the required benefit air quantity of large-scale air cooling generator process air cooler like this; but running time one is long; air filtering box can be stopped up by dust and foreign matter gradually; make the difference of this pressure increasing; mending air quantity descends gradually; the generator cooling effect also worse and worse; the operator on duty is difficult to timely discovery; late when treating the rising of master-control room discovery generator internal temperature, be easy to cause great production accidents such as shutdown.
Summary of the invention:
The objective of the invention is to disclose a kind of complete set of equipments of air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction, to judge whether air filtering box stops up, output alarm signal, the prompting operator on duty changes filtration sponge and the desiccant material in the air filtering box.
Above-mentioned purpose realizes by following technical scheme:
The air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction, its composition comprises: dynamic sampling probe, described dynamic sampling probe is installed in Side in wind-supplying mouth place air filtering box, in air circulation channel, face and close body of wall, described dynamic sampling probe comprises probe segment and connecting pipe part, described connecting pipe is installed in pressure tappings, install along mending the wind direction, the other end opening of described connecting pipe is towards identical with the air circulation direction, described dynamic sampling probe is connected with differential pressure transmitter negative pressure chamber, described differential pressure transmitter links to each other with dc source, differential pressure transmitter becomes linear normalized current signal with the differential pressure signal between plemum and the negative pressure chamber, to represent the normalized current signal input intelligent control unit of differential pressure size by circuit, intelligent control unit is a data signal with the normalized current signal quantization, compares with setting value and sends cue.
Described air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction, described intelligent control unit comprise by, current/voltage converter joining with single-chip microcomputer, amplifier and joining with it warning luminous tube, MAX485 chip and joining with it RS485 serial communication transmission mouth, charactron scanning circuit and joining with it charactron drive circuit and charactron, key circuit and connect superincumbent resistance.
This technical scheme has following beneficial effect:
1. because air circulation channel is a negative pressure with respect to the outer Side of wind-supplying mouth place air filtering box,, just enter into air circulation channel so workplace air enters into Side in the air filtering box by the outer Side of air filtering box.The negative pressure of air circulation channel is recorded and is delivered to negative pressure chamber's (seeing Fig. 2 for details) of differential pressure transmitter by the dynamic pressure probe of this particular design, because the plemum of differential pressure transmitter inlet is exposed in the factory building room air, is normal pressure so record the factory building room air.Differential pressure transmitter becomes linear 4---20m A international standard current signal with the differential pressure signal between plemum and the negative pressure chamber (00.0---30.0KPa).The 24V dc source is the differential pressure transmitter power supply, and its power line also is a 4---20mA normalized current signal transmssion line simultaneously.Represent the 4---20mA normalized current signal of differential pressure size to enter intelligent control unit, intelligent control unit is the data signal of 00.0---30.0KPa with this 4---20mA normalized current signal quantization, compare with setting value 00.0---30.0KPa (being generally 20.0KPa), judge the duty of filter box.
2. dynamic pressure of the present invention is popped one's head in shape as depicted in figs. 1 and 2, and air dynamic behaviour is better, and measurable flow moves the known gas pressure of direction, and is insensitive to Reynolds number, and disorderly error is little of ignoring.
3. can finish Based Intelligent Control: by 4 little button input setting values and switchover operation state and input setting value state; 3 charactrons of first row show measured value 00.0---30.0KPa, second row 3 charactron display setting value 00.0---30.0KPa (being generally 20.0KPa); If measured value is lower than setting value, the warning luminous tube goes out, and illustrates that air filtering box is working properly; If measured value is higher than setting value, the warning luminous tube is bright, illustrates that then air filtering box stops up, and output alarm signal promptly points out the operator on duty in time to change filtration sponge and desiccant material in the air filtering box.Parameters such as all measured values, setting value, alarm signal are transferred to the master-control room computer by the RS485 serial communication interface at any time and carry out screen display, printing, record and form production report and historical record.
Description of drawings:
Fig. 1: air filtering box and dynamic pressure probe scheme of installation.Among the figure: dynamic sampling probe 1, dynamically pressure connecting pipe 2 filters sponge and drying material 3, air filtering box clamping iron net 4.
Fig. 2: be Fig. 1 left view direction pressure tappings position view.
Fig. 3: intelligent testing and warning system for obstruction of air filtering case schematic diagram.
Among the figure: pressure reduction transformer 5,24V dc source 6, intelligent control unit 7.
Fig. 4: intelligent control unit schematic diagram.
Fig. 5: intelligent control unit software flow pattern.
The specific embodiment of the present invention:
Embodiment 1:
The present invention is by dynamic pressure probe 1, the elementary errors of particular design
Send device 5,24V dc source 6, intelligent control unit 7 to form (seeing Fig. 2 for details).Side in wind-supplying mouth place air filtering box, the dynamic pressure probe (seeing Fig. 1 for details) of a particular design is placed at the body of wall position that faces.For judging whether air filtering box stops up, by the negative pressure in the dynamic pressure probe measurement air circulation channel (its absolute value equals workplace air with respect to the differential pressure value in the air circulation channel).
Dynamic pressure probe (seeing Fig. 1 and Fig. 2 for details) is by stainless steel pipe processing and be welded.The inside that is probe segment or connecting pipe part all requires very high surface smoothness, and defectives such as wedge angle, right angle, burr must not be arranged, and can only be that light face or fillet are excessive, to guarantee to have good air dynamic behaviour.
Dynamic pressure probe mounting position (seeing Fig. 1 for details), near better near the body of wall, the negative pressure of measuring is more representative, can be the air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction real data are provided in air circulation channel.
It is 0.075 grade of matured product that differential pressure transmitter is selected precision for use, and the 24V dc source selects for use the regular tap power supply both can.
Intelligent control unit (seeing Fig. 3 for details) is made up of current/voltage converter, single-chip microcomputer (80 C196), amplifier, warning luminous tube, MAX485 chip, charactron scanning circuit, charactron drive circuit, charactron, button, resistance etc.Profile can be made into a standard-sized intelligent instrument specially for same, installs and uses at the power plant scene with convenient.
Implementation process of the present invention is as follows:
The air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction course of work sees Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5 for details.Negative pressure in the dynamic pressure probe measurement air circulation channel of particular design is delivered to the negative pressure chamber of differential pressure transmitter, and workplace air enters the plemum of differential pressure transmitter.Differential pressure transmitter becomes linear 4---20m A international standard current signal with the differential pressure signal between plemum and the negative pressure chamber (00.0---30.0KPa).The 24V dc source is the differential pressure transmitter power supply, and its power line also is a 4---20mA normalized current signal transmssion line simultaneously.The current/voltage converter of representing the 4---20mA normalized current signal of differential pressure size at first to enter in the intelligent control unit becomes the acceptable 0--5V signal of A/D converter, and the 0--5V signal enters that 10 A/D converters become 0～2 in the 80C196 single-chip microcomputer
10Data signal, 0～
210 quantized digital signal is engineering differential pressure value 00.0～30.0kPa, i.e. measured value Δ P
SurveySetting value Δ P
IfBy " increase key ", " reducing key " " shift key " input single-chip microcomputer is as Δ P
Survey＜Δ P
IfThe time, illustrate that air filtering box is working properly, the DO0 mouth output low level of single-chip microcomputer.As Δ P
Survey＞Δ P
IfThe time, illustrate that air filtering box stops up, the DO0 mouth output high level of single-chip microcomputer, it is luminous to amplify driving warning luminous tube through booster output, and the prompting operator on duty changes filtration sponge and the desiccant material in the air filtering box." operation/setting key " is used for the air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction and is operated in running status or is operated in the conversion of importing between the setting value state.Single-chip microcomputer by charactron scanning circuit and charactron drive circuit with measured value Δ P
SurveyWith setting value Δ P
IfDelivering to charactron shows.Serial port of single chip computer SIO becomes standard RS485 serial communication interface by the MAX485 chip, with all measured value Δ P
Survey, setting value Δ P
If, parameter such as alarm signal is transferred to the master-control room computer at any time and carries out screen display, printing, record and form production report and historical record.
Claims (2)
1. air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction, its composition comprises: dynamic sampling probe, it is characterized in that: described dynamic sampling probe is installed in air filtering box inboard, wind-supplying mouth place, in air circulation channel, face and close body of wall, described dynamic sampling probe comprises probe segment and connecting pipe part, described connecting pipe is installed in pressure tappings, install along mending the wind direction, the other end opening of described connecting pipe is towards identical with the air circulation direction, described dynamic sampling probe is connected with differential pressure transmitter negative pressure chamber, described differential pressure transmitter links to each other with dc source, differential pressure transmitter becomes linear normalized current signal with the differential pressure signal between plemum and the negative pressure chamber, to represent the normalized current signal input intelligent control unit of differential pressure size by circuit, intelligent control unit is a data signal with the normalized current signal quantization, compares with setting value and sends cue.
2. air filtering case of large-scale air cooling generator intelligent testing and warning system for obstruction according to claim 1 is characterized in that: described intelligent control unit comprises by transmitting mouth, charactron scanning circuit and joining with it charactron drive circuit and charactron, key circuit and connect superincumbent resistance with the joining current/voltage converter of single-chip microcomputer, amplifier and joining with it warning luminous tube, MAX485 chip and joining with it RS485 serial communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710071923A CN100577254C (en) | 2007-03-22 | 2007-03-22 | Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710071923A CN100577254C (en) | 2007-03-22 | 2007-03-22 | Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101269283A CN101269283A (en) | 2008-09-24 |
| CN100577254C true CN100577254C (en) | 2010-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710071923A Expired - Fee Related CN100577254C (en) | 2007-03-22 | 2007-03-22 | Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator |
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| CN (1) | CN100577254C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112128485B (en) * | 2020-09-28 | 2022-02-22 | 湛江市长合环保科技有限公司 | Butt joint pipeline convenient to overhaul, disassemble and assemble for water treatment |
| CN112973257B (en) * | 2021-02-18 | 2022-04-22 | 珠海格力电器股份有限公司 | Filter element anti-blocking detection method and device, storage medium and water purification equipment |
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| CN101269283A (en) | 2008-09-24 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Harbin Gaige Electric Engineering Co., Ltd. Assignor: Heilongjiang University Contract record no.: 2010230000034 Denomination of invention: Intelligent testing and warning system for obstruction of air filtering case of large-scale air cooling generator Granted publication date: 20100106 License type: Exclusive License Open date: 20080924 Record date: 20100621 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100106 Termination date: 20110322 |