CN103233885A - Differential pressure and pressure combined control method and system for fluid delivery system of reversible fluid pump - Google Patents
Differential pressure and pressure combined control method and system for fluid delivery system of reversible fluid pump Download PDFInfo
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- CN103233885A CN103233885A CN2013101204976A CN201310120497A CN103233885A CN 103233885 A CN103233885 A CN 103233885A CN 2013101204976 A CN2013101204976 A CN 2013101204976A CN 201310120497 A CN201310120497 A CN 201310120497A CN 103233885 A CN103233885 A CN 103233885A
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Abstract
The invention relates to a control technique for the fluid delivery system of a reversible fluid pump, and particularly relates to a differential pressure and pressure combined control method and a system for the fluid delivery system of the reversible fluid pump. According to the method, by mounting a high-limit liquid level detecting pipe and a low-limit liquid level detecting pipe on a transduction cylinder, the position of the high-limit liquid level detecting pipe is taken as a control position of the high-limit liquid level, and the position of the low-limit liquid level detecting pipe is taken as a control position of the low-limit liquid level; during the pumping process of the transduction cylinder, the by detecting the mutation of pressure difference between the gas pressure inside the high-limit liquid level detection pipe and the interior of the transduction cylinder, the tendency is taken as a judgment criteria for high-limit liquid level of the transduction cylinder; during the pressure rushing process of the transduction cylinder, by detecting gas pressure inside the low-limit liquid level detecting pipe and the mutation of pressure difference at the upper part of the transduction cylinder, the tendency is taken as the judgment criteria for low-limit liquid level control; and during the emptying process of the transduction cylinder, and when that the pressure inside the transduction cylinder lowers to a set pressure limit value is detected, next circulating and pumping process is started.
Description
Technical field
But the present invention relates to the control technique of reversed flow body pump fluid delivery system, but be specifically related to controlling method and the system of a kind of reversed flow body pump fluid delivery system differential pressure and pressure combination.
Background technique
But reversed flow body pumping system (Reveres Fluidic Device is hereinafter to be referred as the RFD system) is applied to the conveying of radioactive fluid in the reprocessing as a kind of fluid delivery system of freedom from repairs.
As shown in Figure 1, RFD system works principle and process are as follows: device starts instantaneous, vacuum ejector 1 is air-breathing, in transducing tube 3, produce negative-pressure gas, liquid-vaqor interface rises, and enters 3 accumulation of energys of transducing tube but reversed flow body pump (RFD) 4 sucks feed liquid from feed tank 5, at this moment, system does not have flow output, and the gas that vacuum ejector 1 is discharged enters ventilation system through outlet pipe; After liquid level arrives setting value, close vacuum ejector 1, open simultaneously and press empty sparger 2, system enters pressure towards the stage, presses empty sparger 2 to transducing tube 3 input barotropic gas, and liquid-vaqor interface descends gradually, this moment, transducing tube downstream formed positive press liquid, and directly entered discharge nozzle 6 via RFD and go out stream; After transducing tube 3 liquid levels reach setting value, the empty sparger 2 of occlusion pressure, transducing tube barotropic gas begins exhaust and enters exhaust phase, RFD is owing to run out of steam, it is zero that outflow reduces until the whole system flow gradually, open vacuum ejector 1 enter the next back suction accumulation of energy stage this moment, and system goes round and begins again according to this and forms intermittence and go out stream.
The controlling method of traditional RFD fluid delivery system is with aspiration procedure in the RFD fluid delivery process and presses the liquid level signal of breaking through journey to be converted to time signal as control criterion that evacuation procedure is by the criterion of transducing tube pressure limit as control.At RFD system running, on the one hand because the initial liquid level difference of feed tank, duration control method determines that there is big difficulty initial suction (perhaps press and the dash) time; Owing to feed tank liquid level difference, duration control method is to the certain influence that defines of suction time on the other hand.
Summary of the invention
The objective of the invention is at problems of the prior art, controlling method and the system of the combination of a kind of RFD fluid delivery system differential pressure and pressure are provided, but with aspiration procedure in the RFD fluid delivery process with press the liquid level signal break through journey to be converted to the differential pressure signal of telemeasurement, evacuation procedure is by setting transducing tube pressure limit as the criterion of control.
Technological scheme of the present invention is as follows: but the controlling method of a kind of reversed flow body pump fluid delivery system differential pressure and pressure combination, but described reversed flow body pump fluid delivery system comprises the vacuum ejector that is connected with the transducing tube and presses empty sparger, but the transducing tube is connected with feed tank by reversed flow body pump; This method is by installing high limit liquid level detecting tube and lower bound liquid level detecting tube at the transducing tube, with the control position as high limit liquid level, the position of high limit liquid level detecting tube, with the control position as the lower bound liquid level, the position of lower bound liquid level detecting tube; In transducing tube aspiration procedure, by detecting the sudden change of the pressure difference between the gas pressure and transducing tube inside in the high limit liquid level detecting tube, the criterion of controlling as the high limit liquid level of transducing tube with this trend; Break through in the journey in transducing tube pressure, by the sudden change of the pressure difference on gas pressure and transducing tube top in the detection lower bound liquid level detecting tube, with the criterion of this trend as the control of lower bound liquid level; In transducing tube evacuation procedure, when detection transducing cylinder pressure drops to the pressure limit of setting, start the transducing tube aspiration procedure of next circulation.
But the control system of a kind of reversed flow body pump fluid delivery system differential pressure and pressure combination, comprise the vacuum ejector that is connected with the transducing tube and press empty sparger, but the transducing tube is connected with feed tank by reversed flow body pump, wherein, at the transducing tube high limit liquid level detecting tube and lower bound liquid level detecting tube are installed, high limit liquid level detecting tube is positioned at transducing tube top, lower bound liquid level detecting tube is positioned at the transducing tube bottom, described high limit liquid level detecting tube links to each other with the high voltage terminal of high potential difference pressure transmitter, the low voltage terminal of high potential difference pressure transmitter links to each other with transducing tube top, described lower bound liquid level detecting tube links to each other with the low voltage terminal of low level differential pressure transmitter, and the high voltage terminal of low level differential pressure transmitter links to each other with transducing tube top; The teletransmission pressure transmitter is installed in pressure washing pipe road above the transducing tube; Described high potential difference pressure transmitter, low level differential pressure transmitter and teletransmission pressure transmitter are connected with the PLC programmable controller respectively, and the PLC programmable controller is controlled vacuum ejector respectively and pressed empty sparger.
Beneficial effect of the present invention is as follows: transducing tube of the present invention does not have field instrument, can realize telecontrol; Whole system has automatically reset characteristics, and system can not add up effect by generation time; This controlling method has been eliminated initial liquid level difference to the influence of system's operation.
Description of drawings
Fig. 1 is RFD system architecture and working principle schematic representation;
Fig. 2 is control system structural representation of the present invention;
Fig. 3 is the differential pressure variation tendency schematic representation of high limit liquid level control;
Fig. 4 is the differential pressure variation tendency schematic representation of lower bound liquid level control;
Fig. 5 is controlling method flow chart of the present invention.
Embodiment
Below in conjunction with drawings and Examples the present invention is described in detail.
But core concept of the present invention is with aspiration procedure in the RFD fluid delivery process and presses the liquid level signal of breaking through journey to be converted to the differential pressure signal of telemeasurement that evacuation procedure is by setting transducing tube pressure limit as the criterion of control.
As shown in Figure 2, but reversed flow body pump fluid delivery system differential pressure is formed with the hardware of the control system of pressure combination and is comprised the vacuum ejector 1 that is connected with transducing tube 3 and press empty sparger 2, but transducing tube 3 is connected with feed tank 5 by reversed flow body pump (RFD) 4, and RFD also is connected with discharge nozzle 6.At transducing tube 3 high limit liquid level detecting tube 7 and lower bound liquid level detecting tube 8 are installed, high limit liquid level detecting tube 7 is positioned at transducing tube 3 tops, lower bound liquid level detecting tube 8 is positioned at transducing tube 3 bottoms, described high limit liquid level detecting tube 7 links to each other with the high voltage terminal of high potential difference pressure transmitter 9, the low voltage terminal of high potential difference pressure transmitter 9 links to each other with transducing tube 3 tops, described lower bound liquid level detecting tube 8 links to each other with the low voltage terminal of low level differential pressure transmitter 10, and the high voltage terminal of low level differential pressure transmitter 10 links to each other with transducing tube 3 tops; Teletransmission pressure transmitter 11 is installed in pressure washing pipe road above transducing tube 3; Described high potential difference pressure transmitter 9, low level differential pressure transmitter 10 and teletransmission pressure transmitter 11 are connected with PLC programmable controller 12 respectively, PLC programmable controller 12 also connects the suction electromagnetic valve 13 of vacuum ejector respectively, and the pressure of pressing empty sparger is towards solenoid valve 14.PLC programmable controller 12 also can be connected with data acquistion system and process control machine.
The present invention is according to high limit liquid level pressure difference, lower bound liquid level pressure difference and transducing tube pressure limit, and the switching of control solenoid valve realizes the automatic control of three processes of RFD system.
High limit liquid level control: high limit liquid level detecting tube is installed at the transducing tube.Limit the control position of liquid level as height with the position of high limit liquid level detecting tube.Equipment outdoor mounted teletransmission high potential difference pressure transmitter, high limit liquid level detecting tube links to each other with the high voltage terminal of high potential difference pressure transmitter, and the low voltage terminal of high potential difference pressure transmitter links to each other with transducing tube top.PLC receives high potential difference pressure transmitter signal.In transducing tube aspiration procedure, when liquid level rises to when beginning to flood the bottom opening of high-order observing and controlling pipe, its inside will produce a fluid column, gas is compressed in the detecting tube, make difference between its inside and the transducing tube inside defeat on the occasion of and raise gradually, namely produce a zero-based sudden change, as shown in Figure 3, with the criterion of this trend as the high limit liquid level control of transducing tube.
Lower bound liquid level control: lower bound liquid level detecting tube is installed at the transducing tube.With the control position as the lower bound liquid level, the position of lower bound liquid level detecting tube.Equipment outdoor mounted teletransmission low level differential pressure transmitter, the high voltage terminal of low level differential pressure transmitter links to each other with transducing tube top, and the low voltage terminal of low level differential pressure transmitter links to each other with the lower bound liquid level detecting tube of transducing tube bottom.PLC receives low level differential pressure transmitter signal.Break through in the journey in transducing tube pressure, when liquid level drops to the position that is lower than lower bound liquid level detecting tube bottom opening, the fluid column of lower bound liquid level detecting tube falls suddenly under the effect of gravity, the pressure difference moment vanishing in the lower bound liquid level detecting tube and transducing tube liquid level top, thereby form " V " type pressure reduction sudden change of a step type, as shown in Figure 4, the pressure reduction with this trend changes the criterion of controlling as the lower bound liquid level.
Pressure limit control: the teletransmission pressure transmitter is installed in the pressure washing pipe road above the transducing tube.The transducing tube pressure limit P that sets
0Limit the criterion of control as the pressure of evacuation procedure.In the evacuation procedure, drop to the pressure limit P of setting when the transducing cylinder pressure
0The time, open vacuum ejector, the aspiration procedure of next circulation begins.
In the present embodiment, the control procedure of complete RFD fluid delivery system differential pressure and pressure combination comprises the steps: as shown in Figure 5
(1) the pressure limit P of setting transducing tube
0
(2) start the operation start button, open suction electromagnetic valve, the aspiration procedure by vacuum ejector brings into operation;
(3) the high potential difference pressure transmitter detects high limit liquid level detecting tube internal pressure Pd
1＞0 o'clock, close suction electromagnetic valve, vacuum ejector quits work; Simultaneously, open the compression solenoid valve, break through journey by the pressure of pressing empty sparger and bring into operation;
(4) the low level differential pressure transmitter detects lower bound liquid level detecting tube internal pressure Pd
2=0 o'clock, the closes compression solenoid valve, evacuation procedure begins;
(5) transducing tube teletransmission pressure transmitter detects transducing cylinder pressure P=P
0The time, open suction electromagnetic valve, aspiration procedure begins;
(6) program judges whether to proceed test, is then to change step (3) over to, otherwise off-test.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technology thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (2)
1. but the controlling method of a reversed flow body pump fluid delivery system differential pressure and pressure combination, but described reversed flow body pump fluid delivery system comprises the vacuum ejector that is connected with the transducing tube and presses empty sparger, but the transducing tube is connected with feed tank by reversed flow body pump, it is characterized in that: this method is by installing high limit liquid level detecting tube and lower bound liquid level detecting tube at the transducing tube, with the control position as high limit liquid level, the position of high limit liquid level detecting tube, with the control position as the lower bound liquid level, the position of lower bound liquid level detecting tube; In transducing tube aspiration procedure, by detecting the sudden change of the pressure difference between the gas pressure and transducing tube inside in the high limit liquid level detecting tube, the criterion of controlling as the high limit liquid level of transducing tube with this trend; Break through in the journey in transducing tube pressure, by the sudden change of the pressure difference on gas pressure and transducing tube top in the detection lower bound liquid level detecting tube, with the criterion of this trend as the control of lower bound liquid level; In transducing tube evacuation procedure, when detection transducing cylinder pressure drops to the pressure limit of setting, start the transducing tube aspiration procedure of next circulation.
2. but the control system of a reversed flow body pump fluid delivery system differential pressure and pressure combination, comprise the vacuum ejector that is connected with the transducing tube and press empty sparger, but the transducing tube is connected with feed tank by reversed flow body pump, it is characterized in that: at the transducing tube high limit liquid level detecting tube and lower bound liquid level detecting tube are installed, high limit liquid level detecting tube is positioned at transducing tube top, lower bound liquid level detecting tube is positioned at the transducing tube bottom, described high limit liquid level detecting tube links to each other with the high voltage terminal of high potential difference pressure transmitter, the low voltage terminal of high potential difference pressure transmitter links to each other with transducing tube top, described lower bound liquid level detecting tube links to each other with the low voltage terminal of low level differential pressure transmitter, and the high voltage terminal of low level differential pressure transmitter links to each other with transducing tube top; The teletransmission pressure transmitter is installed in pressure washing pipe road above the transducing tube; Described high potential difference pressure transmitter, low level differential pressure transmitter and teletransmission pressure transmitter are connected with the PLC programmable controller respectively, and the PLC programmable controller is controlled vacuum ejector respectively and pressed empty sparger.
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| CN2013101204976A CN103233885A (en) | 2013-04-09 | 2013-04-09 | Differential pressure and pressure combined control method and system for fluid delivery system of reversible fluid pump |
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| CN2013101204976A CN103233885A (en) | 2013-04-09 | 2013-04-09 | Differential pressure and pressure combined control method and system for fluid delivery system of reversible fluid pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194342A (en) * | 2016-12-08 | 2018-06-22 | 大陆汽车电子(芜湖)有限公司 | Jet pump test device |
| CN109879232A (en) * | 2019-02-22 | 2019-06-14 | 常熟市东卿机械制造有限公司 | A kind of hazardous fluids conveying device based on novel reverse flow steering pump |
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| CN102737737A (en) * | 2012-06-14 | 2012-10-17 | 中国核电工程有限公司 | Exhausting method and exhausting apparatus for RFD system |
| CN102937220A (en) * | 2012-10-16 | 2013-02-20 | 中国核电工程有限公司 | Adjustable and replaceable reversible fluid converter |
-
2013
- 2013-04-09 CN CN2013101204976A patent/CN103233885A/en active Pending
Patent Citations (6)
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Non-Patent Citations (2)
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| 徐聪: "核用RFD泵送系统的研究进展", 《中国核科学技术进展报告（第二卷）--中国核学会2011年学术年会论文集第5册（辐射防护分卷、核化工分卷）》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108194342A (en) * | 2016-12-08 | 2018-06-22 | 大陆汽车电子(芜湖)有限公司 | Jet pump test device |
| CN108194342B (en) * | 2016-12-08 | 2019-11-26 | 大陆汽车电子(芜湖)有限公司 | Jet pump test device |
| CN109879232A (en) * | 2019-02-22 | 2019-06-14 | 常熟市东卿机械制造有限公司 | A kind of hazardous fluids conveying device based on novel reverse flow steering pump |
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Application publication date: 20130807 |