CN106768127B - Pulse type flow accurate measurement and control system and method - Google Patents
Pulse type flow accurate measurement and control system and method Download PDFInfo
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- CN106768127B CN106768127B CN201710015643.7A CN201710015643A CN106768127B CN 106768127 B CN106768127 B CN 106768127B CN 201710015643 A CN201710015643 A CN 201710015643A CN 106768127 B CN106768127 B CN 106768127B
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- 238000005259 measurement Methods 0.000 title claims abstract description 190
- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000005303 weighing Methods 0.000 claims abstract description 202
- 238000004364 calculation method Methods 0.000 claims abstract description 47
- 238000003860 storage Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims description 310
- 239000002184 metal Substances 0.000 claims description 12
- 230000001276 controlling effect Effects 0.000 description 16
- 238000010586 diagram Methods 0.000 description 10
- 238000004590 computer program Methods 0.000 description 7
- 239000003795 chemical substances by application Substances 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 239000003814 drug Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000001186 cumulative effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F11/00—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it
- G01F11/28—Apparatus requiring external operation adapted at each repeated and identical operation to measure and separate a predetermined volume of fluid or fluent solid material from a supply or container, without regard to weight, and to deliver it with stationary measuring chambers having constant volume during measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F15/00—Details of, or accessories for, apparatus of groups G01F1/00 - G01F13/00 insofar as such details or appliances are not adapted to particular types of such apparatus
- G01F15/07—Integration to give total flow, e.g. using mechanically-operated integrating mechanism
- G01F15/075—Integration to give total flow, e.g. using mechanically-operated integrating mechanism using electrically-operated integrating means
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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- Fluid Mechanics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Flow Control (AREA)
- Measuring Volume Flow (AREA)
Abstract
The invention provides a pulse type flow accurate measurement and control system and a method thereof, which relate to the technical field of pulse type flow measurement, wherein the system comprises a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism.
Description
Technical Field
The invention relates to the technical field of pulse flow measurement, in particular to a pulse flow accurate measurement and control system and a pulse flow accurate measurement and control method.
Background
Currently, in industrial applications, such as tap water purification plants, power plants, sewage treatment plants, petrochemical plants, etc., chemical dosing processes, such as addition of auxiliaries, catalysts, etc., are required. In the process of adding medicaments, in order to meet the control of the added medicaments, the control is generally required by a pulse metering pump, and the form of fluid conveyed by the pulse metering pump is pulse flow.
The current pulse flow measurement and control scheme is that a common flowmeter is subjected to filtering average treatment or is directly metered and controlled according to pulse travel, and the measuring precision is low and the error is large; or directly weighing the storage tank by an electronic scale or a common platform balance, measuring the quantity of fluid by measuring the total weight of the starting materials and the residual total weight, replacing a plurality of storage tanks, replacing the storage tanks frequently, stopping the operation of a metering pump, and not ensuring continuous proportional control, and measuring the flow with large measuring range, large dividing value and smaller instantaneous value which is required by the storage tank.
Disclosure of Invention
The embodiment of the invention provides a pulse type accurate flow measuring and controlling system and method, which are used for solving the problems that the current method of directly weighing a storage tank by an electronic scale or a common platform scale, measuring the quantity of fluid by measuring the total weight at the beginning and the residual total weight, replacing a plurality of storage tanks, replacing the storage tanks frequently, stopping the operation of a metering pump, not ensuring continuous proportional control, measuring the flow with large measuring range, large dividing value and smaller instantaneous value can not be measured.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the pulse type flow accurate measurement and control system comprises a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism;
the calculation control module is used for controlling the measurement bypass inlet control device and the measurement bypass outlet valve to be opened and controlling the pulse metering pump to be started so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank;
the calculation control module is also used for controlling the measurement bypass inlet control device to be closed when the liquid medium reaches a preset high liquid level of the weighing tank, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank in a reduced manner;
the calculation control module is also used for controlling the measurement bypass inlet control device to be opened again when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, so that the liquid medium in the storage tank continuously enters the weighing tank;
the calculation control module is also used for determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank;
the calculation control module is further used for obtaining a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference of the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level;
the calculation control module is further used for determining the accumulated flow of the liquid medium according to the summation of the first total flow and the second total flow.
Further, the weighing measurement module further comprises a weighing sensor, an upper connecting metal hose and a lower connecting metal hose; the weighing sensor is connected with the weighing tank and is used for sensing the weight of the liquid medium in the weighing tank; the upper connecting metal hose is connected with an upper end inlet of the weighing tank and is connected with the measuring bypass inlet control device; the lower connecting metal hose is connected with the lower end outlet of the weighing tank and is connected with the measuring bypass outlet valve; the calculation control module is connected with the weighing sensor.
Here, the level of the weighing measurement module is higher than the level of the reservoir tank; the measuring bypass inlet control device is a pipeline pump capable of remotely controlling start and stop.
Alternatively, the level of the weighing measurement module is lower than the level of the reservoir tank; the measurement bypass inlet control device is a second valve capable of being opened and closed in a remote control mode.
In addition, the calculation control module is specifically configured to query a preset flow relation table according to the rotation speed value of the frequency converter, and determine the flow value of the current liquid medium at the rotation speed of the current frequency converter;
according to the formula:
S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time period for the liquid medium to enter the weighing tank.
In addition, the calculation control module is specifically further configured to obtain, according to the weighing sensor, a first weight and a second weight corresponding to each time the liquid medium decreases from the preset high liquid level to the preset low liquid level;
according to the formula:
determining a second total flow S when the liquid medium does not enter the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium to be reduced from the preset high liquid level to the first weight corresponding to the preset low liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the number of times the liquid medium is lowered from the preset high level to the preset low level.
The pulse type flow accurate measurement and control method is applied to a pulse type flow accurate measurement and control system, and the system comprises a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism;
the method comprises the following steps:
controlling the measuring bypass inlet control device and the measuring bypass outlet valve to be opened, and controlling the pulse metering pump to be started, so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank;
when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank;
when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank;
determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank;
acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference of the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level;
and determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow.
Specifically, the determining the first total flow of the liquid medium when entering the weighing tank according to the rotation speed value of the frequency converter and the time length of the liquid medium entering the weighing tank includes:
inquiring a preset flow relation table according to the rotating speed value of the frequency converter, and determining the flow value of the current liquid medium at the rotating speed of the current frequency converter;
according to the formula:
S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time period for the liquid medium to enter the weighing tank.
Specifically, a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank are obtained according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference between the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference between the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level, and the method comprises the following steps:
acquiring a first weight and a second weight corresponding to the liquid medium which is reduced from the preset high liquid level to the preset low liquid level each time according to the weighing sensor;
according to the formula:
determining a second total flow S when the liquid medium does not enter the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium to be reduced from the preset high liquid level to the first weight corresponding to the preset low liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the decrease of the liquid medium from the preset high level to the measured flow valueThe number of times of low liquid level is preset.
The embodiment of the invention provides a system and a method for accurately measuring and controlling pulse flow, wherein the system comprises a calculation control module, a storage tank, a pulse metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism; the calculation control module can control the measurement bypass inlet control device and the measurement bypass outlet valve to be opened and control the pulse metering pump to be started, so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank; when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank; when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank; determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank; acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference of the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level; and determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow. The invention can realize continuous accurate measurement of various liquid medium pulse flow, can realize remote monitoring and control of the pulse flow, and the whole measuring module is not in direct contact with the measured medium, has no complicated mechanical structural parts, has low failure rate, and can realize long-period stable operation. The invention can solve the problems that the continuous proportional control can not be ensured, the measuring range required by the measuring storage tank is large, the dividing value is large, and the flow with smaller instantaneous value can not be measured in the prior art.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a pulse flow accurate measurement and control system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a pulse flow accurate measurement and control system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a pulse flow accurate measurement and control system according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a pulse flow accurate measurement and control system according to an embodiment of the present invention;
fig. 5 is a flowchart of a method for precisely measuring and controlling pulse flow according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a pulse type flow accurate measurement and control system, which includes a calculation control module 11, a reservoir tank 12, a pulse type metering pump 13, and a measurement bypass 14; the pulse metering pump 13 is provided with a frequency converter 21 for regulating the rotation speed or a remotely controlled travel regulating mechanism (not shown in the figure); the outlet of the agent storage tank 12 is connected with the inlet of the pulse metering pump 13 through a first connecting pipeline 15 and a second connecting pipeline 16 which are arranged in parallel; the first connecting pipeline 15 is provided with a first valve 17; the second connecting pipeline 16 is provided with a measurement bypass inlet control device 18 and a measurement bypass outlet valve 19; the measurement bypass 14 is arranged between the measurement bypass inlet control device 18 and a measurement bypass outlet valve 19; the measurement bypass 14 includes a weighing measurement module 20; the weighing measurement module 20 comprises a weighing tank 201; the calculation control module 11 is respectively connected with the first valve 17, the measurement bypass inlet control device 18, the measurement bypass outlet valve 19 and the weighing measurement module 20, and is in control connection with the pulse metering pump 13 through a frequency converter 21 or a stroke adjusting mechanism.
It should be noted that the computing control module 11 may be any one of a microprocessor, a distributed control system (Distributed Control System, abbreviated as DCS), a programmable logic controller (Programmable Logic Controller, abbreviated as PLC), an industrial control computer (Industrial Personal Computer, abbreviated as IPC), and the like, but is not limited thereto.
The calculation control module 11 controls the opening of the measurement bypass inlet control device 18 and the measurement bypass outlet valve 19 and controls the actuation of the pulse metering pump 13 such that the liquid medium in the reservoir tank 12 enters the weigh tank 201 and reaches a predetermined high level in the weigh tank 201. The volume of the reservoir tank 12 may be 0.1 cubic meters. The minimum flow of the pulse metering pump 13 may be 1 liter per hour.
The calculation control module 11 may also control the measurement bypass inlet control means 18 to close when the liquid medium reaches a preset high level in the weigh tank 201, such that the liquid medium in the weigh tank 201 is pumped out by the pulse metering pump 13 and reduced to a preset low level in the weigh tank 201.
The calculation control module 11 may also re-control the opening of the measurement bypass inlet control means 18 when the liquid medium reduction reaches a preset low level in the weigh tank 201 so that the liquid medium in the reservoir tank 12 continues to enter the weigh tank 201. By repeating this, a plurality of working cycles (i.e. the liquid level of the liquid medium decreases from a preset high level to a preset low level and then increases from the preset low level to a preset high level) can be formed.
The calculation control module 11 may also determine the first total flow rate of the liquid medium when entering the weigh tank 201 based on the rotational speed value of the frequency converter 21 and the length of time the liquid medium enters the weigh tank.
The calculation control module 11 may also obtain a first weight of the liquid medium reaching a preset high level of the weigh tank 201 and a second weight of the liquid medium reaching a preset low level of the weigh tank 201 according to the weigh measurement module 20; the flow rate of the pulse metering pump can be measured according to the difference between the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference between the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level. When the flow of the metering pump is smaller than the required control value, the output signal of the computer control module increases the rotating speed of the frequency converter or the stroke of the stroke adjusting mechanism, and otherwise, the rotating speed or the stroke is reduced. When the liquid medium in the weighing tank 201 is in the time range from the set first weight to the second weight, the calculation control module 11 establishes and updates a corresponding relation table of the flow rate of the metering pump and the rotating speed of the frequency converter or the stroke value of the stroke adjusting mechanism while the flow rate is measured.
The calculation control module 11 may also determine the cumulative flow rate of the liquid medium based on the sum of the first total flow rate and the second total flow rate.
Further, as shown in fig. 2, the weighing module 20 may further include a load cell 202, an upper connection metal hose 203, and a lower connection metal hose 204. The weighing sensor 202 is connected with the weighing tank 201 and can sense the weight of the liquid medium in the weighing tank 201; the upper connecting metal hose 203 is connected with the upper end inlet of the weighing tank 201 and is connected with the measuring bypass inlet control device 18; the lower connecting metal hose 204 is connected with the lower end outlet of the weighing tank 201 and is connected with the measuring bypass outlet valve 19; the calculation control module 11 is connected with the load cell 202.
Here, as shown in fig. 3, the level of the weighing measurement module 20 is higher than the level of the reservoir tank 12, and the measurement bypass inlet control device 18 may be a pipeline pump 181 capable of remotely controlling start and stop.
Alternatively, as shown in FIG. 4, where the level of the weighing measurement module 20 is below the level of the reservoir tank 12, the measurement bypass inlet control device 18 may be a second valve 182 that can be remotely controlled to open and close.
In addition, the calculation control module 11 may specifically query a preset flow relation table according to the rotation speed value of the frequency converter, and determine the flow value of the current liquid medium at the rotation speed of the current frequency converter.
According to the formula:
S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time period for the liquid medium to enter the weighing tank.
Here, a corresponding relation curve of the rotation speed value of the frequency converter and the flow value of the liquid medium can be preset to form a flow relation table, so that the flow relation table can be directly queried according to the rotation speed value of the frequency converter, and the flow value of the current liquid medium at the rotation speed of the current frequency converter can be obtained. It is worth to say that, the flow relation table can be automatically established and updated in real time by the calculation control module according to the value corresponding to the real-time revolution number of the frequency converter and the flow of the liquid medium.
In addition, the calculation control module 11 may specifically further obtain, according to the load cell, a first weight and a second weight corresponding to each time the liquid medium decreases from the preset high liquid level to the preset low liquid level.
According to the formula:
determining a second total flow S when the liquid medium does not enter the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium to be reduced from the preset high liquid level to the first weight corresponding to the preset low liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the number of times the liquid medium is lowered from the preset high level to the preset low level; wherein P is n+1 -P n For the measured flow value, the value is determined in time units, P n+1 And P n Is a value at two time points at 1 second intervals. The term (P) n+1 -P n )≠(P n -P n-1 ) I.e. the flow value corresponding to two time points is varied. Thus, the obtained second total flow is the instantaneous flow without pulse influence of the pulse metering pump.
The embodiment of the invention provides a pulse type flow accurate measurement and control system, which comprises a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism; the calculation control module can control the measurement bypass inlet control device and the measurement bypass outlet valve to be opened and control the pulse metering pump to be started, so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank; when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank; when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank; determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank; acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference of the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level; and determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow. The invention can realize continuous accurate measurement of various liquid medium pulse flow, can realize remote monitoring and control of the pulse flow, and the whole measuring module is not in direct contact with the measured medium, has no complicated mechanical structural parts, has low failure rate, and can realize long-period stable operation. The invention can solve the problems that the continuous proportional control can not be ensured, the measuring range required by the measuring storage tank is large, the dividing value is large, and the flow with smaller instantaneous value can not be measured in the prior art.
The embodiment of the present invention provides a pulse type flow accurate measurement and control method corresponding to the pulse type flow accurate measurement and control system shown in fig. 1 to 4, as shown in fig. 5, comprising:
step 301, controlling the measurement bypass inlet control device and the measurement bypass outlet valve to be opened, and controlling the pulse metering pump to be started, so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank.
Step 302, when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank in a reduced manner.
Step 303, when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, controlling the measurement bypass inlet control device to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank. After step 303, step 302 may be returned to complete a plurality of working cycles (i.e., the level of the liquid medium decreases from a preset high level to a preset low level and then increases from the preset low level to the preset high level), after which step 304 may be performed.
Step 304, determining a first total flow rate of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time period when the liquid medium enters the weighing tank.
Here, the following manner may be adopted specifically:
and inquiring a preset flow relation table according to the rotating speed value of the frequency converter, and determining the flow value of the current liquid medium at the rotating speed of the current frequency converter. Thereafter, according to the formula: s is S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time period for the liquid medium to enter the weighing tank.
Step 305, obtaining a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference between the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference between the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level.
Here, the following manner may be adopted specifically:
acquiring a first weight and a second weight corresponding to the liquid medium which is reduced from the preset high liquid level to the preset low liquid level each time according to the weighing sensor; thereafter, according to the formula:determining a second total flow S when the liquid medium does not enter the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium to be reduced from the preset high liquid level to the first weight corresponding to the preset low liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the number of times the liquid medium is lowered from the preset high level to the preset low level.
Step 306, determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow.
The embodiment of the invention provides a pulse type flow accurate measurement and control method, which is used for controlling the opening of a measurement bypass inlet control device and a measurement bypass outlet valve and controlling the starting of a pulse type metering pump, so that a liquid medium in a storage tank enters a weighing tank and reaches a preset high liquid level of the weighing tank; when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank; when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank; determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank; acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; the flow rate of the pulse metering pump can be measured according to the difference of the two-point measurement values in unit time in a time range, and the second total flow rate when the liquid medium does not enter the weighing tank is determined according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level; and determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow. The invention can realize continuous accurate measurement of various liquid medium pulse flow, can realize remote monitoring and control of the pulse flow, and the whole measuring module is not in direct contact with the measured medium, has no complicated mechanical structural parts, has low failure rate, and can realize long-period stable operation. The invention can solve the problems that the continuous proportional control can not be ensured, the measuring range required by the measuring storage tank is large, the dividing value is large, and the flow with smaller instantaneous value can not be measured in the prior art.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
Claims (5)
1. The pulse type flow accurate measurement and control system is characterized by comprising a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism;
the calculation control module is used for controlling the measurement bypass inlet control device and the measurement bypass outlet valve to be opened and controlling the pulse metering pump to be started so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank;
the calculation control module is also used for controlling the measurement bypass inlet control device to be closed when the liquid medium reaches a preset high liquid level of the weighing tank, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank in a reduced manner;
the calculation control module is also used for controlling the measurement bypass inlet control device to be opened again when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, so that the liquid medium in the storage tank continuously enters the weighing tank;
the calculation control module is also used for determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank;
the calculation control module is specifically used for inquiring a preset flow relation table according to the rotating speed value of the frequency converter and determining the flow value of the current liquid medium at the rotating speed of the current frequency converter;
according to the formula:
S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time length of the liquid medium entering the weighing tank;
the calculation control module is further used for obtaining a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; measuring the flow between two points according to the difference of the measurement values of the two points in unit time within a time range, and calculating and determining the second total flow of the liquid medium when the liquid medium flows out of the weighing tank according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level;
the calculation control module is specifically configured to obtain, according to a weighing sensor, a first weight and a second weight corresponding to each time the liquid medium is reduced from the preset high liquid level to the preset low liquid level;
according to the formula:
determining a second total flow S of the liquid medium out of the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium reaching the first weight corresponding to the preset high liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the number of times the liquid medium is lowered from the preset high level to the preset low level; the calculation control module is further used for determining the accumulated flow of the liquid medium according to the summation of the first total flow and the second total flow.
2. The pulsed accurate flow measurement and control system of claim 1 wherein the weighing measurement module further comprises a load cell, an upper connection metal hose, a lower connection metal hose; the weighing sensor is connected with the weighing tank and is used for sensing the weight of the liquid medium in the weighing tank; the upper connecting metal hose is connected with an upper end inlet of the weighing tank and is connected with the measuring bypass inlet control device; the lower connecting metal hose is connected with the lower end outlet of the weighing tank and is connected with the measuring bypass outlet valve; the calculation control module is connected with the weighing sensor.
3. The pulsed flow precision measurement and control system of claim 1, wherein a horizontal position of the weighing measurement module is higher than a horizontal position of the reservoir tank; the measuring bypass inlet control device is a pipeline pump capable of remotely controlling start and stop.
4. The pulsed flow precision measurement and control system of claim 1, wherein a horizontal position of the weighing measurement module is lower than a horizontal position of the reservoir tank; the measurement bypass inlet control device is a second valve capable of being opened and closed in a remote control mode.
5. The pulse type flow accurate measurement and control method is characterized by being applied to a pulse type flow accurate measurement and control system, wherein the system comprises a calculation control module, a storage tank, a pulse type metering pump and a measurement bypass; the pulse metering pump is provided with a frequency converter for adjusting the rotating speed or a remotely controlled stroke adjusting mechanism; the outlet of the agent storage tank is connected with the inlet of the pulse metering pump through a first connecting pipeline and a second connecting pipeline which are arranged in parallel; a first valve is arranged on the first connecting pipeline; the second connecting pipeline is provided with a measurement bypass inlet control device and a measurement bypass outlet valve; the measurement bypass is arranged between the measurement bypass inlet control device and the measurement bypass outlet valve; the measurement bypass comprises a weighing measurement module; the weighing measurement module comprises a weighing tank; the calculation control module is respectively connected with the first valve, the measurement bypass inlet control device, the measurement bypass outlet valve and the weighing measurement module, and is controlled and connected with the pulse metering pump through a frequency converter or a stroke adjusting mechanism;
the method comprises the following steps:
controlling the measuring bypass inlet control device and the measuring bypass outlet valve to be opened, and controlling the pulse metering pump to be started, so that the liquid medium in the storage tank enters the weighing tank and reaches a preset high liquid level of the weighing tank;
when the liquid medium reaches a preset high liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be closed, so that the liquid medium in the weighing tank is pumped out by the pulse metering pump, and the liquid medium reaches a preset low liquid level of the weighing tank;
when the liquid medium is reduced to reach a preset low liquid level of the weighing tank, the measuring bypass inlet control device is controlled to be opened again, so that the liquid medium in the storage tank continuously enters the weighing tank;
determining a first total flow of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank;
the method for determining the total first flow rate of the liquid medium when the liquid medium enters the weighing tank according to the rotating speed value of the frequency converter and the time length of the liquid medium entering the weighing tank comprises the following steps:
inquiring a preset flow relation table according to the rotating speed value of the frequency converter, and determining the flow value of the current liquid medium at the rotating speed of the current frequency converter;
according to the formula:
S 1 =Σw×t; determining a first total flow S of the liquid medium when entering the weighing tank 1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein w is the flow value; t is the time length of the liquid medium entering the weighing tank;
acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank according to the weighing measurement module; measuring the flow between two points according to the difference of the measurement values of the two points in unit time within a time range, and calculating and determining the second total flow of the liquid medium when the liquid medium flows out of the weighing tank according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level;
the weighing measuring module is used for acquiring a first weight when the liquid medium reaches a preset high liquid level of the weighing tank and a second weight when the liquid medium reaches a preset low liquid level of the weighing tank; measuring the flow rate between two points according to the difference of the two-point measurement value of unit time in a time range, and calculating and determining the second total flow rate of the liquid medium when the liquid medium flows out of the weighing tank according to the first weight, the second weight and the accumulated amount of the difference of the measurement values when the liquid medium is reduced from the preset high liquid level to the preset low liquid level, wherein the method comprises the following steps:
acquiring a first weight and a second weight corresponding to the liquid medium which is reduced from the preset high liquid level to the preset low liquid level each time according to a weighing sensor;
according to the formula:
determining a second total flow S of the liquid medium out of the weighing tank 2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein P is n+1 For the nth liquid medium reaching the first weight corresponding to the preset high liquid level, P n For the nth liquid medium to be reduced from the preset high liquid level to the second weight corresponding to the preset low liquid level, P n+1 -P n For the measured flow value, m is the number of times the liquid medium is lowered from the preset high level to the preset low level;
and determining the accumulated flow of the liquid medium according to the sum of the first total flow and the second total flow.
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| CN108196598A (en) * | 2018-03-05 | 2018-06-22 | 昆山鼎工业科技有限公司 | A kind of on-line automatic medicine system of continuous metal surface disposing line and its adding method thereof |
| CN114199332A (en) * | 2021-11-30 | 2022-03-18 | 保定雷弗流体科技有限公司 | Automatic detection device and method for flow of transfer pump |
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