CN111472967A - Automatic discharge capacity adjusting system and method for dosing pump - Google Patents
Automatic discharge capacity adjusting system and method for dosing pumpDownload PDFInfo
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- CN111472967A CN111472967ACN202010271800.2ACN202010271800ACN111472967ACN 111472967 ACN111472967 ACN 111472967ACN 202010271800 ACN202010271800 ACN 202010271800ACN 111472967 ACN111472967 ACN 111472967A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B13/00—Pumps specially modified to deliver fixed or variable measured quantities
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B15/00—Pumps adapted to handle specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B43/00—Machines, pumps, or pumping installations having flexible working members
- F04B43/02—Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
- F04B43/04—Pumps having electric drive
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
Description
Technical Field
The invention belongs to the technical field of oil and gas field ground engineering, and particularly relates to an automatic discharge capacity adjusting system and method of a dosing pump.
Background
In the process of oil and gas field development, various chemical agents such as demulsifiers, paraffin removal (prevention) agents, scale inhibitors and the like are added to oil and gas gathering and transportation sites to ensure normal production of oil and gas fields. When adding the medicament, a metering pump (divided into a plunger type and a diaphragm type) is generally adopted to pressurize and drive the chemical medicament into a pipeline, and the dosage of the medicament is synchronously metered. The displacement of the metering pump can be adjusted according to the field requirement, and the general adjusting method comprises two methods: one is manual adjustment, and the stroke length of the metering pump is manually adjusted according to the requirement after the pump is stopped, so that the purpose of adjusting the displacement is achieved; the other is automatic adjustment, the stroke length or the reciprocating frequency of the metering pump is remotely and automatically adjusted in the operation process of the pump, and the purpose of adjusting the displacement is achieved.
In the process of oil gas gathering and transportation, due to the fact that most stations are discontinuously transported under the influence of various factors, the frequent stopping (or changing) of transportation of an upstream station causes that the dosing amount of a downstream station needs to be frequently adjusted (the dosing concentration is constant, and the dosing amount needs to be adjusted when the liquid amount changes). Along with the continuous progress of oil and gas field digital construction, the metering pump of manual regulation uses less and less, and metering pump field application that can automatically regulated increases. At present, the control methods for automatically adjusting the metering pump also have two types: firstly, frequency conversion control is carried out, namely, the reciprocating frequency of a metering pump is adjusted through a frequency conversion controller to realize displacement adjustment; and the second is electric stroke control, namely the stroke length of the metering pump is adjusted through an electric stroke controller, so that the displacement is adjusted.
At present, the automatic regulation dosing pump (metering pump) used in oil and gas fields adopts a single control mode, namely frequency conversion control or electric stroke control. Because the number of the upstream stations of the dosing station is large, if the upstream stations stop (or change the output) at the same time, the liquid output of the dosing station is changed greatly, the dosing amount cannot be adjusted to a required value at all by a single control mode, the dosing concentration may be greater than or less than a specified concentration during the period, so that the medicament is wasted or the preset dosing effect cannot be achieved, the production of an oil and gas field is influenced, and a plurality of stations have to replace dosing pumps.
In the prior art, a plurality of dosing systems and methods are available, the simultaneous adjustment of the stroke and the frequency of a dosing pump cannot be realized, and the requirement of the displacement adjustment of the dosing pump in an oil-gas field station library cannot be met.
Disclosure of Invention
The invention provides a system and a method for automatically adjusting the discharge capacity of a dosing pump, and aims to provide a method for adjusting the discharge capacity of the dosing pump, which can greatly increase the adjustment range of the discharge capacity of the dosing pump, reduce the waste of chemicals and the replacement cost of equipment, and better meet the dosing requirements of the chemicals in an oil field.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a dosing pump discharge capacity automatic regulating system, includes the dosing pump at least, its characterized in that: the device also comprises a flowmeter, an upper computer, a control mechanism, a frequency converter, a motor and a stroke control device; the flow meter is in signal connection with an upper machine, and the control mechanism is in signal connection with the frequency converter, the stroke control device and the upper machine through cables; the frequency converter is electrically connected with the motor through a cable, the motor is electrically connected with the dosing pump, and the dosing pump is connected with a stroke control device for controlling the stroke of the dosing pump.
The control mechanism adopts a P L C control cabinet.
The stroke control device adopts an electric stroke controller.
The motor adopts a three-phase motor.
The automatic regulation method of the discharge capacity of the dosing pump comprises the following steps
The method comprises the following steps: collecting station-entering liquid volume information
Step two: calculating the dosing discharge capacity according to the preset dosing concentration according to the station entering liquid amount information collected in the step one;
step three: controlled dosing is carried out according to the dosing discharge capacity calculated in the step two;
step four: calculating the accumulated liquid amount at intervals of preset time, and when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is not more than a preset value, keeping the discharge capacity of the medicine adding pump unchanged, and continuously adding medicine according to the current discharge capacity; and returning to the step one when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is larger than a preset value.
The station entering liquid amount information is acquired by starting an automatic discharge capacity adjusting system of the dosing pump in the step one, the upper computer acquires the station entering liquid amount information from the flowmeter, and the station entering liquid amount information is sent to the control mechanism after being acquired by the upper computer; in the second step, the control mechanism processes the acquired station liquid amount information, and the discharge capacity of the dosing pump is calculated according to the set dosing concentration; then the control mechanism controls the stroke control device and the frequency converter through the result obtained by calculation; the stroke control device adjusts the stroke length of the dosing pump, and the dosing pump starts dosing after the frequency of the motor is adjusted through the frequency converter.
The preset interval time for calculating the accumulated liquid amount in the fourth step is 15-25 minutes.
The predetermined interval time is 20 minutes.
And in the fourth step, the preset value of the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is 5-15%.
In the seventh step, the predetermined value of the error Δ Q between the current accumulated liquid amount and the previous accumulated liquid amount is 10%.
Has the advantages that:
1. the invention provides a dosing pump which is simultaneously matched with a variable frequency controller and an electric stroke controller, and the two adjusting modes are combined. When the requirement cannot be met by adopting one adjusting mode, the two modes are adjusted simultaneously, so that the adjusting range of the discharge capacity of the dosing pump can be greatly increased (at least increased by 1 time), the dosing requirement of the oil field medicament is better met, the waste of the medicament and the equipment replacement cost are reduced, and the technical guarantee is provided for the normal production of the oil and gas field.
2. The dosing pump adopts the adjusting method when the variable frequency controller and the electric stroke controller are adopted, so that the problem that the dosing pump damages equipment when the dosing pump works for a long time under the condition of too low motor frequency or small stroke is avoided.
3. The invention provides a method for controlling the discharge capacity of a dosing pump when the reading of a flow meter changes frequently due to the influence of various factors, which can avoid the problem that equipment is damaged due to frequent changes of a frequency converter and an electric stroke regulator.
The foregoing description is only an overview of the technical solutions of the present invention, and in order to clearly understand the technical solutions of the present invention and to implement the technical solutions according to the contents of the description, the following detailed description is given with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a flow chart of the method of the present invention.
In the figure: 1-a flow meter; 2-an upper computer; 3-a control mechanism; 4-a frequency converter; 5, a motor; 6-a dosing pump; 7-stroke control means.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the automatic dosing pump displacement adjusting system shown in fig. 1 at least comprises adosing pump 6, aflowmeter 1, anupper computer 2, acontrol mechanism 3, a frequency converter 4, amotor 5 and astroke control device 7; theflowmeter 1 is in electrical signal connection with theupper computer 2, and thecontrol mechanism 3 is in electrical signal connection with the frequency converter 4, thestroke control device 7 and theupper computer 2 through cables respectively; the frequency converter 4 is electrically connected with themotor 5 through a cable, themotor 5 is electrically connected with thedosing pump 6, and thedosing pump 6 is connected with astroke control device 7 for controlling the stroke of thedosing pump 6.
During actual use, theupper computer 2 collects the station entering liquid volume data through theflowmeter 1 and transmits the station entering liquid volume data to thecontrol mechanism 3, and thecontrol mechanism 3 calculates the discharge capacity of the dosing pump according to the incoming liquid flow and the required dosing concentration and outputs signals to thestroke control device 7 and the frequency converter 4 respectively. The frequency converter 4 is started by a motor electrically connected with a cable, so that the speed of thedosing pump 6 is automatically adjusted; thestroke control device 7 adjusts the stroke of thedosing pump 6, so that the discharge capacity of thedosing pump 6 is adjusted, and automatic dosing is realized.
Thedosing pump 6 is simultaneously matched with the frequency converter 4 and thestroke control device 7, and the two adjusting modes are combined. When the requirement cannot be met by adopting one adjusting mode, the two modes are simultaneously adjusted, so that the adjusting range of the discharge capacity of thedosing pump 6 can be greatly increased (at least increased by 1 time), the dosing requirement of the oil field medicament is better met, the waste of the medicament and the equipment replacement cost are reduced, and the technical guarantee is provided for the normal production of the oil and gas field. The invention provides an adjusting method when adosing pump 6 adopts two adjusting modes of a frequency converter 4 and astroke control device 7, which not only avoids the problem that thedosing pump 6 damages equipment when the frequency of amotor 5 is too low or the stroke is smaller after long-time working, but also avoids the problem that the frequency converter 4 and thestroke control device 7 are frequently changed to damage the equipment due to frequent change of the reading of a flow meter caused by various factors (such as pressure fluctuation of incoming liquid from each station at the upstream, gas influence and the like).
The connection of the whole system and the connection of a power line of the dosing pump are strictly executed according to design, and preliminary debugging is needed after the connection is finished, so that the normal operation of the design functions of all parts is ensured. When the frequency converter is applied specifically, the frequency converter is matched and installed according to the power required by the dosing pump motor, belongs to mature products, can select products of Miton Luo company, can realize 10-50Hz frequency conversion digital display, is high in adjustment precision, is simple to maintain, and does not need additional control equipment. The rated voltage is 380V +/-10%, the control signal is 4-20mA, the protection level is IP56, and the output precision is +/-0.5%.
The electric stroke controller can be selected from products of Miton Luo company, has the functions of electric adjustment and manual adjustment, can be directly installed on a dosing pump (metering pump), does not need additional control equipment, is supplied with power by 220V in a single phase, has the adjustment range of 0-100 percent, has a control signal of 4-20mA, has a protection level IP65 and has an output precision of +/-0.5 percent F.S.
The frequency converter and the electric stroke controller need to be installed according to the instruction provided by a manufacturer.
The invention provides a dosing pump which is simultaneously matched with a variable frequency controller and an electric stroke controller, and the two adjusting modes are combined. When the requirement cannot be met by adopting one adjusting mode, the two modes are adjusted simultaneously, so that the adjusting range of the discharge capacity of the dosing pump can be greatly increased (at least increased by 1 time), the dosing requirement of the oil field medicament is better met, the waste of the medicament and the equipment replacement cost are reduced, and the technical guarantee is provided for the normal production of the oil and gas field.
The dosing pump adopts two adjusting modes of the frequency converter and the stroke controller, so that the problem that the dosing pump damages equipment when the frequency of a motor is too low or the stroke is too small after long-time working is avoided.
The invention provides a method for controlling the discharge capacity of a dosing pump when the reading of a flow meter changes frequently due to the influence of various factors, which can avoid the problem that equipment is damaged due to frequent changes of a frequency converter and an electric stroke regulator.
Example two:
the automatic dosing pump displacement regulating system shown in fig. 1 is different from the first embodiment in that thecontrol mechanism 3 adopts a P L C control cabinet.
Thestroke control device 7 adopts an electric stroke controller.
Themotor 5 adopts a three-phase motor.
In actual use, thecontrol mechanism 3 adopts a P L C control cabinet to complete calculation and logic control functions, thestroke control device 7 adopts an electric stroke controller to timely acquire signals sent by the P L C control cabinet to adjust the stroke length so that the discharge capacity of the dosing pump meets the current dosing requirement, and themotor 5 adopts a three-phase motor to ensure that the dosing pump has better operation performance.
The frequency converter and the motor, the frequency converter and the P L C controller, the electric stroke controller and the P L C controller, and the P L C controller and the upper computer are connected by cables.
The P L C control cabinet in the embodiment is a complete set of control cabinet, mainly comprises an air switch, a P L C, a power supply, a relay, a wiring terminal and the like, can be combined according to the size of an actual control scale, can adapt to various large-scale and small-scale industrial automation control occasions, adopts products produced by a loose manufacturer, and can be adopted by products produced by companies such as Siemens, Mitsubishi, Schneider and the like in specific application.
Example three:
the automatic regulation method for the discharge capacity of the dosing pump according to the figure 2 comprises the following steps
The method comprises the following steps: collecting station-entering liquid volume information
Step two: calculating the dosing discharge capacity according to the preset dosing concentration according to the station entering liquid amount information collected in the step one;
step three: controlled dosing is carried out according to the dosing discharge capacity calculated in the step two;
step four: calculating the accumulated liquid amount at intervals of preset time, and when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is not more than a preset value, keeping the discharge capacity of the medicine adding pump unchanged, and continuously adding medicine according to the current discharge capacity; and returning to the step one when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is larger than a preset value.
The method provides a method for controlling the discharge capacity of the dosing pump when the reading of the flow meter changes frequently due to the influence of various factors, and can avoid the problem that equipment is damaged due to frequent changes of a frequency converter and an electric stroke regulator.
Example four:
the automatic discharge capacity adjusting method of the dosing pump is different from the third embodiment in that: the station entering liquid amount information is acquired by starting an automatic discharge capacity adjusting system of the dosing pump in the step one, theupper computer 2 acquires the station entering liquid amount information from theflowmeter 1, and the station entering liquid amount information is acquired by theupper computer 2 and then sent to thecontrol mechanism 3; in the second step, thecontrol mechanism 3 processes the acquired information of the station entering liquid amount, and the discharge amount of thedosing pump 6 is calculated according to the set dosing concentration; then thecontrol mechanism 3 controls thestroke control device 7 and the frequency converter 4 through the result obtained by calculation; thestroke control device 7 adjusts the stroke length of thedosing pump 6, and thedosing pump 6 starts to dose after the frequency of themotor 5 is adjusted by the frequency converter 4.
After the medicine is added, if the pressure fluctuation and the gas influence of liquid coming from each station at the upstream cause the sudden change of the reading of a flowmeter, the system automatically calculates the accumulated liquid quantity at preset time intervals, the time interval can be manually set according to actual production, when the error between the accumulated liquid quantity at this time and the accumulated liquid quantity at the last time is less than or equal to a preset value, the discharge quantity of the medicine adding pump is unchanged, the medicine is continuously added according to the current discharge quantity, and otherwise, the discharge quantity of the medicine adding pump is recalculated and readjusted.
The invention provides a dosing pump which is simultaneously matched with a variable frequency controller and an electric stroke controller, and the two adjusting modes are combined. When the requirement cannot be met by adopting one adjusting mode, the two modes are adjusted simultaneously, so that the adjusting range of the discharge capacity of the dosing pump can be greatly increased (at least increased by 1 time), the dosing requirement of the oil field medicament is better met, the waste of the medicament and the equipment replacement cost are reduced, and the technical guarantee is provided for the normal production of the oil and gas field. The dosing pump adopts the adjusting method when the variable frequency controller and the electric stroke controller are adopted, so that the problem that the dosing pump damages equipment when the dosing pump works for a long time under the condition of too low motor frequency or small stroke is avoided. The invention provides a method for controlling the discharge capacity of a dosing pump when the reading of a flow meter changes frequently due to the influence of various factors, which can avoid the problem that equipment is damaged due to frequent changes of a frequency converter and an electric stroke regulator.
Example five:
according to the automatic adjustment method for the discharge capacity of the dosing pump shown in FIG. 1, the difference from the third embodiment is that: the preset interval time for calculating the accumulated liquid amount in the step seven is 15-25 minutes.
The predetermined interval time is 20 minutes.
During actual use, after dosing is started, if the pressure fluctuation and the gas influence of liquid from each upstream station occur and the reading of the flow meter changes suddenly, the system automatically calculates the accumulated liquid amount every 20 minutes after starting the pump, and when the error between the accumulated liquid amount at this time and the accumulated liquid amount at the last time is smaller than or equal to a preset value, the dosing pump keeps dosing according to the current discharge amount. Otherwise, the discharge capacity of the dosing pump is recalculated and readjusted.
The predetermined interval time is set to 20 minutes, and is applicable to general system conditions. The set interval time is too long, and once the duration time of the large flow change is too long in the middle, the problems of medicament waste or insufficient dosing concentration to influence production are caused; the time is too short, and the dosing pump and the motor frequently change the working state, so that equipment is damaged or the service life is greatly shortened.
Example six:
according to the automatic adjustment method for the discharge capacity of the dosing pump shown in FIG. 1, the difference from the third embodiment is that: comprises the following steps
The method comprises the following steps: connecting all components of the automatic discharge capacity regulating system of the dosing pump;
step two: debugging an automatic discharge capacity adjusting system of the dosing pump;
step three: starting an automatic discharge capacity adjusting system of the dosing pump, and sending a station entering liquid quantity signal acquired from theflowmeter 1 to thecontrol mechanism 3 by theupper computer 2;
step four: thecontrol mechanism 3 processes the information of the station entering liquid amount and calculates the discharge capacity of thechemical dosing pump 6 according to the set chemical dosing concentration;
step five: thecontrol mechanism 3 controls thestroke control device 7 and the frequency converter 4 through the result obtained by calculation, thestroke control device 7 adjusts the stroke length of thedosing pump 6, and the frequency converter 4 adjusts the frequency of themotor 5;
step six: after the fifth step is finished, themedicine adding pump 6 starts to add medicine;
step seven: the control mechanism calculates the accumulated liquid amount at intervals of preset time, and when the error delta Q between the accumulated liquid amount at this time and the accumulated liquid amount at the last time is not larger than a preset value, the discharge capacity of the medicine adding pump is unchanged, and medicine adding is continued according to the current discharge capacity; and returning to the fourth step when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is larger than the preset value.
In actual use, liquid volume signals of an approach flow meter are collected and transmitted to a P L C control cabinet, the P L C control cabinet determines the approach liquid volume according to the collected approach liquid volume signals, the discharge Q1 of adosing pump 6 is calculated according to set dosing concentration, the P L C control cabinet controls an electric stroke regulator to regulate the stroke length of thedosing pump 6, and considering that the fault is increased when a motor works for a long time due to insufficient heat dissipation when the frequency of a common motor is regulated to be below 30Hz, the stroke length is firstly regulated to the stroke length percentage L, namely Q1/(0.6Q) is regulated0) For some special motors, the frequency percentage F may be 40%, and the stroke length may be adjusted by adjusting the stroke length percentage L to Q1/(0.4Q) for the pump0). After the discharge capacity of the dosing pump is roughly adjusted by changing the stroke length, the frequency converter is controlled to adjust the rotating speed of the motor, so that the frequency of the motor reaches about 30Hz, and the frequency percentage F is about 60%, and the discharge capacity of the dosing pump meets the requirement of current dosingThe requirement of the medicine.
After the discharge capacity of thedosing pump 6 is automatically adjusted to a required value, the reading of the flow meter can be changed suddenly high and suddenly low sometimes due to the fluctuation of liquid pressure, the influence of gas and the like of each upstream station, and in order to avoid the frequency converter 4 and the electric stroke regulator from frequently changing to damage equipment, the following method is adopted for adjustment:
the system automatically calculates the accumulated liquid amount every 20 minutes after starting the pump, and in specific application, the time interval can also be manually set according to actual production, when the error delta Q between the accumulated liquid amount at this time and the accumulated liquid amount at the last time is less than or equal to 10%, the discharge capacity of the medicine adding pump is unchanged, and medicine adding is continuously carried out according to the current discharge capacity; when the accumulated liquid volume error delta Q is larger than 10%, the oil is generally started or stopped at an upstream station, and the discharge capacity of the dosing pump is immediately adjusted according to the fourth step to the sixth step.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
In the case of no conflict, a person skilled in the art may combine the related technical features in the above examples according to actual situations to achieve corresponding technical effects, and details of various combining situations are not described herein.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The foregoing is illustrative of the preferred embodiments of the present invention, and the present invention is not to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent change and modification of the above embodiments according to the technical spirit of the present invention still fall within the scope of the technical solution of the present invention.
Claims (10)
1. An automatic dosing pump displacement adjusting system at least comprises a dosing pump (6), and is characterized in that: the device also comprises a flowmeter (1), an upper computer (2), a control mechanism (3), a frequency converter (4), a motor (5) and a stroke control device (7); the flow meter (1) is in electrical signal connection with the upper computer (2), and the control mechanism (3) is in electrical signal connection with the frequency converter (4), the stroke control device (7) and the upper computer (2) through cables; the frequency converter (4) is electrically connected with the motor (5) through a cable, the motor (5) is electrically connected with the dosing pump (6), and the dosing pump (6) is connected with a stroke control device (7) for controlling the stroke of the dosing pump (6).
2. The automatic dosing pump displacement regulating system as claimed in claim 1, wherein the control mechanism (3) adopts a P L C control cabinet.
3. The automatic dosing pump displacement adjustment system of claim 1, wherein: the stroke control device (7) adopts an electric stroke controller.
4. The automatic dosing pump displacement adjustment system of claim 1, wherein: the motor (5) adopts a three-phase motor.
5. The automatic regulation method for the discharge capacity of the dosing pump is characterized by comprising the following steps
The method comprises the following steps: collecting station-entering liquid volume information
Step two: calculating the dosing discharge capacity according to the preset dosing concentration according to the station entering liquid amount information collected in the step one;
step three: controlled dosing is carried out according to the dosing discharge capacity calculated in the step two;
step four: calculating the accumulated liquid amount at intervals of preset time, and when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is not more than a preset value, keeping the discharge capacity of the medicine adding pump unchanged, and continuously adding medicine according to the current discharge capacity; and returning to the step one when the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is larger than a preset value.
6. The method of claim 5, wherein the method further comprises the step of: the station entering liquid amount information is acquired by starting an automatic discharge capacity adjusting system of the dosing pump in the step one, the upper computer (2) acquires the station entering liquid amount information from the flowmeter (1), and the station entering liquid amount information acquired by the upper computer (2) is sent to the control mechanism (3); in the second step, the control mechanism (3) processes the acquired station liquid amount information, and the discharge amount of the dosing pump (6) is calculated according to the set dosing concentration; then the control mechanism (3) controls the stroke control device (7) and the frequency converter (4) through the result obtained by calculation; the stroke control device (7) adjusts the stroke length of the dosing pump (6), and the dosing pump (6) starts to dose medicine after the frequency of the motor (5) is adjusted by the frequency converter (4).
7. The method of claim 5, wherein the method further comprises the step of: the preset interval time for calculating the accumulated liquid amount in the fourth step is 15-25 minutes.
8. The method of claim 7, wherein the method further comprises the step of: the predetermined interval time is 20 minutes.
9. The method of claim 5, wherein the method further comprises the step of: and in the fourth step, the preset value of the error delta Q between the current accumulated liquid amount and the last accumulated liquid amount is 5-15%.
10. A method of automatically adjusting the displacement of a dosing pump as defined in claim 9, wherein: in the seventh step, the predetermined value of the error Δ Q between the current accumulated liquid amount and the previous accumulated liquid amount is 10%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010271800.2ACN111472967A (en) | 2020-04-08 | 2020-04-08 | Automatic discharge capacity adjusting system and method for dosing pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115903927A (en)* | 2022-12-02 | 2023-04-04 | 中国核动力研究设计院 | Wide-range flow linear adjustment method and system |
| CN115992808A (en)* | 2021-10-19 | 2023-04-21 | 中国石油化工股份有限公司 | Charging pump with adjustable feeding amount |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115992808A (en)* | 2021-10-19 | 2023-04-21 | 中国石油化工股份有限公司 | Charging pump with adjustable feeding amount |
| CN115903927A (en)* | 2022-12-02 | 2023-04-04 | 中国核动力研究设计院 | Wide-range flow linear adjustment method and system |
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