CN105300459A - Self-cleaning flow detection device - Google Patents
Self-cleaning flow detection device Download PDFInfo
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- CN105300459A CN105300459A CN201510848861.XA CN201510848861A CN105300459A CN 105300459 A CN105300459 A CN 105300459A CN 201510848861 A CN201510848861 A CN 201510848861A CN 105300459 A CN105300459 A CN 105300459A
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Abstract
The invention discloses a self-cleaning flow detection device which comprises a flow detection device and a pressure tapping purging device, wherein the flow detection device comprises a flow integrating purging controller, a differential pressure transmitter, a pressure transmitter and a temperature sensor; the pressure tapping purging device comprises a gas filtering reducing valve, an electromagnetic stop valve, an electromagnetic directional valve, a pressure tapping pipeline and a tri-valve set; the flow integrating purging controller is electrically connected with the differential pressure transmitter, the pressure transmitter, the temperature sensor, the electromagnetic stop valve and the electromagnetic directional valve by a signal wire; the pressure tapping pipeline comprises a differential pressure high pressure tapping pipeline, a differential pressure low pressure tapping pipeline and a pressure tapping pipeline; the inlet of the gas filtering reducing valve is connected with a purging gas pipeline; the pressure of the purging gas is higher than the pressure of a measured pipeline, and the flow integrating purging controller is used for controlling the states of the electromagnetic stop valve and the electromagnetic directional valve through electric signals, so as to achieve the switching of a purging state and a pressure tapping state of the pipeline. The device is compact in structure and high in measurement precision and can avoid damage caused by the fact that purging gas enters the transmitter.
Description
Technical field
The present invention relates to pipeline flow checkout equipment technical field, especially a kind of automatically cleaning flow detector.
Background technology
Differential flow measurement is conventional flow-measuring method, it forms differential pressure through restriction device or particular conduit when utilizing gas or liquid and other medium to flow in pipeline, this differential pressure is measured to detect the flow of the fluid flowing through pipeline by differential pressure transmitter, due to medium density different pressure and temperature conditions be change, in order to the actual flow of accurate-metering fluid, also need to adopt pressure unit and temperature sensor to detect the pressure and temperature of medium, and calculate actual flow by temperature and pressure compensation algorithm.Differential pressure measured by differential pressure transmitter and pressure transmitter measurement pressure needs to utilize pressure pipeline to carry out pressure.When coal gas, waste gas, normal air etc. contain the gas flow measurement of the impurity such as water or dust, pressure pipeline often results in blockage by the impact of impurity, affect the accuracy of flow measurement, need to carry out pipeline cleaning, need time serious to change pressure pipeline, add maintenance workload and maintenance cost; In order to avoid there are the problems referred to above, normal employing pressure blowing method of pipeline in prior art, this method mainly contains two kinds of modes:
One is by transforming pressure pipeline, increases source purge gas pipeline and stop valve, manual site can operate the cleaning of each stop valve realization to pressure pipeline;
Two is that stop valve is replaced by electromagnet cut off valve, is operated solenoid valve by operated from a distance button, or adopts PLC to carry out self-timing control.
In prior art there is following problem in above method: one be the instantaneous delivery of flow instrument in purge is zero, and cause measurement deviation, accuracy of detection is low; Two is can not reliably end under electromagnet cut off valve fault condition, high-pressure blowing gas may be caused to seal in transmitter and cause device damage, add operation and maintenance cost, the efficiency that impact detects.
Summary of the invention
Technical matters to be solved by this invention, is exactly for the above-mentioned deficiency existing for prior art, provides a kind of automatically cleaning flow detector; Structure of the present invention is simple, be easy to operation, measuring accuracy is high, working service is easy to maintenance, solve in prior art because the instantaneous delivery of flow instrument in purge is zero cause measurement deviation problem, adopt gas circuit dual cut-out, avoid sweep gas and seal in the problem that transmitter causes damage, by flow detector and pressure blow device combined, realize continuous flow integrating and on-line automatic timing purges or artificial long-range purging.
This programme is achieved by the following technical measures:
A kind of automatically cleaning flow detector, comprise flow detector and pressure blow device, described flow detector comprises flow accumulation and purges controller, differential pressure transmitter, pressure unit, temperature sensor, and described pressure blow device comprises gas filtration reduction valve, electromagnet cut off valve, solenoid directional control valve, pressure pipeline, three valve groups, described flow accumulation purges controller by signal wire and differential pressure transmitter, pressure unit, temperature sensor, electromagnet cut off valve, solenoid directional control valve is electrically connected, and described electromagnet cut off valve comprises electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three, described solenoid directional control valve comprises two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three, described pressure pipeline comprises differential pressure high pressure pressure pipeline, differential pressure low pressure pressure pipeline, pressure pressure pipeline, the entrance of described gas filtration reduction valve connects sweep gas pipeline, the pressure of described sweep gas higher than measured pipeline pressure, the outlet of gas filtration reduction valve respectively with electromagnet cut off valve one, electromagnet cut off valve two, the entrance of electromagnet cut off valve three is connected in parallel, the outlet of electromagnet cut off valve one is connected with the media outlet of two-position three way magnetic valve one, the working hole of two-position three way magnetic valve one is connected with differential pressure high pressure pressure pipeline, the medium entrance of two-position three way magnetic valve one is connected with the high pressure entry of three valve groups, and the high-pressure outlet of three valve groups is connected with the high-pressure process interface of differential pressure transmitter, the outlet of electromagnet cut off valve two is connected with the media outlet of two-position three way magnetic valve two, the working hole of two-position three way magnetic valve two is connected with differential pressure low pressure pressure pipeline, the medium entrance of two-position three way magnetic valve two is connected with the low-pressure inlet of three valve groups, and the low tension outlet of three valve groups is connected with the low pressure event interface of differential pressure transmitter, the outlet of electromagnet cut off valve three is connected with the media outlet of two-position three way magnetic valve three, and the working hole of two-position three way magnetic valve three is connected with pressure pressure pipeline, and the medium entrance of two-position three way magnetic valve three is connected with pressure unit, described flow accumulation purges controller controls electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three, two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three state by electric signal, realizes the switching of blowing pipeline and pressure state.
Described sweep gas adopts with the source of the gas of predetermined pressure higher than measured pipeline pressure, described source of the gas is nitrogen, pressurized air, steam, source of the gas is supplied by pipe network or is supplied by gas-holder, when flow accumulation purging controller controls in the state of purging, sweep gas enters measured pipeline from source of the gas through purging pipeline, realizes purging the purging of pipeline and cleaning.
Automatically cleaning flow detector is in pressure duty, under flow accumulation purges controller control, electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three remain off state, described two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three keeps medium entrance and working hole to connect, differential pressure high pressure pressure pipeline, two-position three way magnetic valve one, the high-pressure channel of three valve groups, differential pressure transmitter high-pressure process interface forms the differential pressure high pressure pressure pipeline connected, differential pressure low pressure pressure pipeline, two-position three way magnetic valve two, the low-pressure channel of three valve groups, differential pressure transmitter low pressure event interface forms the differential pressure low pressure pressure pipeline connected, pressure pressure pipeline, two-position three way magnetic valve three, pressure unit forms the pressure pressure pipeline connected, described flow accumulation purges controller and receives differential pressure transmitter, pressure unit, the electric signal of temperature sensor, temperature and pressure compensation algorithm is adopted to calculate actual instantaneous delivery.
Automatically cleaning flow detector is in purging duty, under flow accumulation purges controller control, described electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three stays open state, control two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three is for media outlet is to working hole, differential pressure high pressure pressure pipeline, two-position three way magnetic valve one, electromagnet cut off valve one, gas filtration reduction valve forms the differential pressure high-pressure blowing pipeline connected, the pressure of differential pressure low pressure, two-position three way magnetic valve two, electromagnet cut off valve two, gas filtration reduction valve forms the differential pressure low pressure purge pipeline connected, pressure pressure pipeline, two-position three way magnetic valve three, electromagnet cut off valve one, gas filtration reduction valve forms the pressure purge pipeline connected, sweep gas is blown into on-the-spot pipeline from pipeline, realize pipe-line purging, under actual instantaneous delivery keeps pressure state, initial value is constant, under avoiding purging state, instantaneous delivery makes zero, described flow accumulation purges controller and carries out integrating generation integrated flow to actual instantaneous delivery.
Described flow accumulation purges controller and is provided with self-timing purging, artificial long-range purging two kinds of patterns, flow accumulation purges controller and carries out self-timing purging by human interface device, control sweep gas under being operated in auto state, or is switched purging and detected state by manual operation, realized artificial long-range purging; Under self-timing purge mode, according to purging limit interval time pre-set and purging duration limit, flow accumulation purges controller and calculates, confirms to purge from last time the purging interval time started, when purging interval time exceed purge interval time limit after, automatically carry out into purging state, and start to calculate the purging duration, after the purging duration exceedes purging duration limit, purge stopping; Under artificial long-range purge mode, the man-machine interface that operating personnel can purge controller band by flow accumulation purges controller to flow accumulation and sends and purge instruction or stop purging instruction, realizes Long-distance Control and purges.
Described automatically cleaning flow detector is located in an instrument box.
Described flow accumulation purges the position that controller is located at the outside convenient operation of instrument box.
The beneficial effect of this programme
1. the present invention is combined by flow detector and pressure blow device, is adopted integrated design, realize flow detection and continuous flow integrating, and on-line automatic timing purges or artificial long-range purging, effectively solve pressure pipeline blockage problem, achieve the long-term online dirty gas flow of stably measured; Structure of the present invention is simple, be easy to operation, measuring accuracy is high, working service is easy to maintenance, solve in prior art because the instantaneous delivery of flow instrument in purge is zero cause measurement deviation problem, adopt gas circuit dual cut-out, avoid sweep gas and seal in the problem that transmitter causes damage, present invention achieves the long-term online dirty gas flow of stably measured.
2. device of the present invention can all be arranged in an instrument box, the switching of crossing in pipeline between each valve body state can form two kinds of pipelines: pressure pipeline and cleaning pipeline, can regularly to the dust in pipeline, dirtyly to clean, prevent line clogging, thus solve the technical matters that cannot normally detect because of line clogging in prior art, guarantee that instrument is operated in optimum Working; Dual cut-out can be carried out to pressure pipeline during purging, avoid sweep gas and seal in the problem that transmitter causes damage, reduce and make to make good use of maintenance cost, improve work efficiency and plant factor, high financial profit; Under device is operated in purging state, under actual instantaneous delivery keeps pressure state, initial value is constant, and under avoiding purging state, instantaneous delivery makes zero, and Measurement sensibility is good, and measuring accuracy is high.In addition, it is compact that said apparatus is all arranged on an instrument box inner structure, occupies little space, and is particularly useful for the field of employment that space is smaller.
3. the present invention adopts two-position three way magnetic valve control, switching and field pipes and purges the connection status of pipeline or pressure pipeline, adopt electromagnet cut off valve to control to purge connection or the disconnection of pipeline simultaneously, achieve the dual cut-out to pressure pipeline, structural stability, reliability are high, avoid sweep gas and seal in the problem that transmitter causes damage.
Accompanying drawing explanation
Fig. 1 is the structural representation of the specific embodiment of the invention.
Wherein, 1 flow accumulation purges controller, 2 differential pressure transmitters, 3 pressure units, 4 temperature sensors, 5 gas filtration reduction valve, 6 electromagnet cut off valve one, 7 electromagnet cut off valve two, 8 electromagnet cut off valve three, 9 two-position three way magnetic valve one, 10 two-position three way magnetic valve two, 11 two-position three way magnetic valves three, 12 differential pressure high pressure pressure pipelines, 13 differential pressure low pressure pressure pipelines, 14 pressure pressure pipelines, 15 3 valve groups.
Embodiment
For the technical characterstic of this programme can be clearly demonstrated, below by an embodiment, and in conjunction with its accompanying drawing, this programme is set forth.
Composition graphs 1, a kind of automatically cleaning flow detector, comprise flow detector and pressure blow device, described flow detector comprises flow accumulation and purges controller 1, differential pressure transmitter 2, pressure unit 3, temperature sensor 4, and described pressure blow device comprises gas filtration reduction valve 5, electromagnet cut off valve, solenoid directional control valve, pressure pipeline, three valve groups 15, described flow accumulation purging controller 1 carries out electric signal by signal wire with differential pressure transmitter 2, pressure unit 3, temperature sensor 4, electromagnet cut off valve, solenoid directional control valve and is connected, form detecting and controlling system, described electromagnet cut off valve comprises electromagnet cut off valve 1, electromagnet cut off valve 27, electromagnet cut off valve 38, described solenoid directional control valve comprises two-position three way magnetic valve 1, two-position three way magnetic valve 2 10, two-position three way magnetic valve 3 11, and described pressure pipeline comprises differential pressure high pressure pressure pipeline 12, differential pressure low pressure pressure pipeline 13, pressure pressure pipeline 14, the entrance of described gas filtration reduction valve 5 connects sweep gas pipeline, the outlet of gas filtration reduction valve 5 respectively with electromagnet cut off valve 1, electromagnet cut off valve 27, the entrance of electromagnet cut off valve 38 is connected in parallel, wherein the outlet of electromagnet cut off valve 1 is connected with the media outlet (the R mouth namely in figure) of two-position three way magnetic valve 1, the working hole (the A mouth in figure) of two-position three way magnetic valve 1 is connected with differential pressure high pressure pressure pipeline 12, the medium entrance (the P mouth in figure) of two-position three way magnetic valve 1 is connected with the high pressure entry of three valve groups 15, the high-pressure outlet of three valve groups 15 is connected with the high-pressure process interface of differential pressure transmitter 2, the outlet of electromagnet cut off valve 27 is connected with the media outlet of two-position three way magnetic valve 2 10, the working hole of two-position three way magnetic valve 2 10 is connected with differential pressure low pressure pressure pipeline 13, the medium entrance of two-position three way magnetic valve 2 10 is connected with the low-pressure inlet of three valve groups 15, and the low tension outlet of three valve groups 15 is connected with the low pressure event interface of differential pressure transmitter 2, the outlet of electromagnet cut off valve 38 is connected with the media outlet (the R mouth in figure) of two-position three way magnetic valve 3 11, the working hole of two-position three way magnetic valve 3 11 is connected with pressure pressure pipeline 14, and the medium entrance of two-position three way magnetic valve 3 11 is connected with pressure unit 3.Described automatically cleaning flow detector can be located in an instrument box.Certainly, described flow accumulation purges the position that controller also can be located at the outside convenient operation of instrument box.
Described sweep gas adopt with predetermined pressure and pressure higher than the source of the gas of measured pipeline pressure, source of the gas can be nitrogen, pressurized air, steam etc., and source of the gas is supplied by pipe network or supplied by gas-holder, for the purging of pressure pipeline.When flow accumulation purging controller controls in the state of purging, sweep gas enters measured pipeline from source of the gas through purging pipeline, realizes purging the purging of pipeline and cleaning.
Described flow accumulation purges controller 1 controls electromagnet cut off valve 1, electromagnet cut off valve 27, electromagnet cut off valve 38, two-position three way magnetic valve 1, two-position three way magnetic valve 2 10, two-position three way magnetic valve 3 11 state by electric signal, realizes the switching of blowing pipeline and pressure state.
Automatically cleaning flow detector when pressure duty, flow accumulation purge controller 1 control under, described electromagnet cut off valve 1, electromagnet cut off valve 27, electromagnet cut off valve 38 remain off state, described two-position three way magnetic valve 1, two-position three way magnetic valve 2 10, two-position three way magnetic valve 3 11 keeps medium entrance and working hole to connect, differential pressure high pressure pressure pipeline 12, two-position three way magnetic valve 1, the high-pressure channel of three valve groups 15, differential pressure transmitter 2 high-pressure process interface forms the differential pressure high pressure pressure pipeline connected, differential pressure low pressure pressure pipeline 13, two-position three way magnetic valve 2 10, the low-pressure channel of three valve groups 15, differential pressure transmitter 2 low pressure event interface forms the differential pressure low pressure pressure pipeline connected, pressure pressure pipeline 14, two-position three way magnetic valve 3 11, pressure unit 3 forms the pressure pressure pipeline connected, and described flow accumulation purges controller 1 and receives differential pressure transmitter 2, pressure unit 3, the electric signal of temperature sensor 4, adopts temperature and pressure compensation algorithm to calculate actual instantaneous delivery.
Automatically cleaning flow detector is purging under duty, under flow accumulation purges controller 1 control, and described electromagnet cut off valve 1, electromagnet cut off valve 27, electromagnet cut off valve 38 stays open state, controls two-position three way magnetic valve 1, two-position three way magnetic valve 2 10, two-position three way magnetic valve 3 11 is for media outlet is to working hole, i.e. R-A conducting, differential pressure high pressure pressure pipeline 12, two-position three way magnetic valve 1, electromagnet cut off valve 1, gas filtration reduction valve 5 forms the differential pressure high-pressure blowing pipeline connected, differential pressure low pressure pressure 13, two-position three way magnetic valve 2 10, electromagnet cut off valve 27, gas filtration reduction valve 5 forms the differential pressure low pressure purge pipeline connected, pressure pressure pipeline 14, two-position three way magnetic valve 3 11, electromagnet cut off valve 1, gas filtration reduction valve 5 forms the pressure purge pipeline connected, and sweep gas is blown into on-the-spot pipeline from pipeline, realize pipe-line purging, under actual instantaneous delivery keeps pressure state, initial value is constant, and under avoiding purging state, instantaneous delivery makes zero, described flow accumulation purges controller 1 and carries out integrating generation integrated flow to actual instantaneous delivery.
Described flow accumulation purges controller and is provided with self-timing purging, artificial long-range purging two kinds of modes, flow accumulation purges controller and passes through human interface device, self-timing purging is carried out under making sweep gas be operated in auto state, also can be switched by manual operation and purge and detected state, realize artificial long-range purging; Under self-timing purge mode, according to purging limit interval time pre-set and duration limit can be purged, the software of flow accumulation purging controller automatically calculates and purges from last time the purging interval time started, when purging interval time exceed purge interval time limit after, automatically carry out into purging state, and start to calculate the purging duration, after the purging duration exceedes purging duration limit, purge stopping.Under artificial long-range purge mode, the man-machine interface that operating personnel can purge controller band by flow accumulation purges controller to flow accumulation and sends and purge instruction or stop purging instruction, realizes Long-distance Control and purges.
By reference to the accompanying drawings the embodiment of invention is described although above-mentioned; but not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (7)
1. an automatically cleaning flow detector, it is characterized in that, comprise flow detector and pressure blow device, described flow detector comprises flow accumulation and purges controller, differential pressure transmitter, pressure unit, temperature sensor, and described pressure blow device comprises gas filtration reduction valve, electromagnet cut off valve, solenoid directional control valve, pressure pipeline, three valve groups, described flow accumulation purges controller by signal wire and differential pressure transmitter, pressure unit, temperature sensor, electromagnet cut off valve, solenoid directional control valve is electrically connected, and described electromagnet cut off valve comprises electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three, described solenoid directional control valve comprises two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three, described pressure pipeline comprises differential pressure high pressure pressure pipeline, differential pressure low pressure pressure pipeline, pressure pressure pipeline, the entrance of described gas filtration reduction valve connects sweep gas pipeline, the pressure of described sweep gas higher than measured pipeline pressure, the outlet of gas filtration reduction valve respectively with electromagnet cut off valve one, electromagnet cut off valve two, the entrance of electromagnet cut off valve three is connected in parallel, the outlet of electromagnet cut off valve one is connected with the media outlet of two-position three way magnetic valve one, the working hole of two-position three way magnetic valve one is connected with differential pressure high pressure pressure pipeline, the medium entrance of two-position three way magnetic valve one is connected with the high pressure entry of three valve groups, and the high-pressure outlet of three valve groups is connected with the high-pressure process interface of differential pressure transmitter, the outlet of electromagnet cut off valve two is connected with the media outlet of two-position three way magnetic valve two, the working hole of two-position three way magnetic valve two is connected with differential pressure low pressure pressure pipeline, the medium entrance of two-position three way magnetic valve two is connected with the low-pressure inlet of three valve groups, and the low tension outlet of three valve groups is connected with the low pressure event interface of differential pressure transmitter, the outlet of electromagnet cut off valve three is connected with the media outlet of two-position three way magnetic valve three, and the working hole of two-position three way magnetic valve three is connected with pressure pressure pipeline, and the medium entrance of two-position three way magnetic valve three is connected with pressure unit, described flow accumulation purges controller controls electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three, two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three state by electric signal, realizes the switching of blowing pipeline and pressure state.
2. automatically cleaning flow detector as claimed in claim 1, it is characterized in that, described sweep gas adopts with the source of the gas of predetermined pressure higher than measured pipeline pressure, described source of the gas is nitrogen, pressurized air, steam, source of the gas is by pipe network or gas-holder supply, when flow accumulation purging controller controls in the state of purging, sweep gas entering measured pipeline from source of the gas through purging pipeline, realizing purging the purging of pipeline and cleaning.
3. automatically cleaning flow detector as described in claim 1 or 2, it is characterized in that, automatically cleaning flow detector is in pressure duty, under flow accumulation purges controller control, electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three remain off state, described two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three keeps medium entrance and working hole to connect, differential pressure high pressure pressure pipeline, two-position three way magnetic valve one, the high-pressure channel of three valve groups, differential pressure transmitter high-pressure process interface forms the differential pressure high pressure pressure pipeline connected, differential pressure low pressure pressure pipeline, two-position three way magnetic valve two, the low-pressure channel of three valve groups, differential pressure transmitter low pressure event interface forms the differential pressure low pressure pressure pipeline connected, pressure pressure pipeline, two-position three way magnetic valve three, pressure unit forms the pressure pressure pipeline connected, and described flow accumulation purges controller and receives differential pressure transmitter, pressure unit, the electric signal of temperature sensor, adopts temperature and pressure compensation algorithm to calculate actual instantaneous delivery.
4. automatically cleaning flow detector as described in claim 1 or 2, it is characterized in that, automatically cleaning flow detector is in purging duty, under flow accumulation purges controller control, described electromagnet cut off valve one, electromagnet cut off valve two, electromagnet cut off valve three stays open state, controls two-position three way magnetic valve one, two-position three way magnetic valve two, two-position three way magnetic valve three for media outlet is to working hole, differential pressure high pressure pressure pipeline, two-position three way magnetic valve one, electromagnet cut off valve one, gas filtration reduction valve forms the differential pressure high-pressure blowing pipeline connected, the pressure of differential pressure low pressure, two-position three way magnetic valve two, electromagnet cut off valve two, gas filtration reduction valve forms the differential pressure low pressure purge pipeline connected, pressure pressure pipeline, two-position three way magnetic valve three, electromagnet cut off valve one, gas filtration reduction valve forms the pressure purge pipeline connected, and sweep gas is blown into on-the-spot pipeline from pipeline, realize pipe-line purging, under actual instantaneous delivery keeps pressure state, initial value is constant, and under avoiding purging state, instantaneous delivery makes zero, described flow accumulation purges controller and carries out integrating generation integrated flow to actual instantaneous delivery.
5. automatically cleaning flow detector as described in claim 1 or 2, it is characterized in that, described flow accumulation purges controller and is provided with self-timing purging, artificial long-range purging two kinds of patterns, flow accumulation purges controller and carries out self-timing purging by human interface device, control sweep gas under being operated in auto state, or is switched purging and detected state by manual operation, realized artificial long-range purging; Under self-timing purge mode, according to purging limit interval time pre-set and purging duration limit, flow accumulation purges controller and calculates, confirms to purge from last time the purging interval time started, when purging interval time exceed purge interval time limit after, automatically carry out into purging state, and start to calculate the purging duration, after the purging duration exceedes purging duration limit, purge stopping; Under artificial long-range purge mode, the man-machine interface that operating personnel can purge controller band by flow accumulation purges controller to flow accumulation and sends and purge instruction or stop purging instruction, realizes Long-distance Control and purges.
6. automatically cleaning flow detector as claimed in claim 1, it is characterized in that, described automatically cleaning flow detector is located in an instrument box.
7. automatically cleaning flow detector as claimed in claim 6, is characterized in that, described flow accumulation purges the position that controller is located at the outside convenient operation of instrument box.
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| CN201510848861.XA CN105300459B (en) | 2015-11-26 | 2015-11-26 | Automatically cleaning flow detector |
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| CN105903729A (en) * | 2016-06-15 | 2016-08-31 | 武金玉 | Anti-blocking purging device |
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| CN107764361A (en) * | 2017-09-13 | 2018-03-06 | 美核电气（济南）股份有限公司 | Purging system and method for nuclear power station differential pressure measurement |
| CN108918789A (en) * | 2018-09-08 | 2018-11-30 | 深圳市能源环保有限公司 | A kind of purge gass air supply system of the continuous on-line monitoring system of power-plant flue gas |
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