CN114754019A - Fixed air volume control method and system based on impeller - Google Patents
Fixed air volume control method and system based on impeller Download PDFInfo
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- CN114754019A CN114754019A CN202210369664.XA CN202210369664A CN114754019A CN 114754019 A CN114754019 A CN 114754019A CN 202210369664 A CN202210369664 A CN 202210369664A CN 114754019 A CN114754019 A CN 114754019A
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- 238000000034 method Methods 0.000 title claims abstract description 30
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- 238000005259 measurement Methods 0.000 abstract description 6
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- 238000004590 computer program Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229920001296 polysiloxane Polymers 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
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- 230000009123 feedback regulation Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
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- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The invention belongs to the technical field of impeller air volume control, and particularly provides a fixed air volume control method and a system based on an impeller, wherein the method comprises the following steps: calculating the current air quantity passing through the valve according to the rotating speed of the impeller; comparing and analyzing the current air volume and the preset air volume to obtain an air volume difference value; and converting the air volume difference into the corresponding rotating speed of the impeller according to the air volume difference so as to realize closed-loop feedback control on the impeller. By improving the measurement mode and the throttling mode, the defects of poor control performance and low precision of the existing air quantity determining device are overcome, and the control precision of the air quantity determining device is improved. The self-adaptive control of the air quantity can be realized, the stability of the air quantity is ensured, and the resistance loss of the system is reduced.
Description
Technical Field
The invention relates to the technical field of impeller air volume control, in particular to a fixed air volume control method and a fixed air volume control system based on an impeller.
Background
With the development of domestic coal-fired units towards an intelligent direction, the accurate measurement and control of key parameters such as air quantity are of great importance. In order to measure and calibrate the online air volume measuring device, various portable air volume measuring devices are developed domestically, wherein the common and typical air volume measuring devices are pitot tubes, backrest tubes and flute tubes. The conventional portable air volume measuring device is generally processed by stainless steel pipes and is limited by factors such as materials, transportation conditions and the like, and the length of the conventional portable air volume measuring device is generally within 2m and is generally not more than 3m under special conditions. However, with the continuous improvement of the capacity grade of domestic coal-fired units, the size of the flue is continuously increased, wherein the size of the hot secondary air flue at the outlet of the air preheater of a million units generally reaches more than 6m multiplied by 5m, if a conventional portable air volume measuring device is still adopted, the requirement of cross section grid method measurement cannot be met, and the accuracy of air volume measurement is greatly reduced. If the pitot tube of the air volume measuring device is connected by extending materials such as a silicone tube, and the shell is extended by a stainless steel tube, the temperature of hot secondary air at the outlet of the air preheater basically exceeds 300 ℃, and the materials such as the silicone tube can not meet the requirement of high temperature resistance.
According to the control requirements of the existing air quantity fixing device, a sensor for measuring air quantity has high requirements on air speed in a pitot tube mode, and meanwhile, an adjusted valve plate is easy to block and cannot be adjusted in air quantity.
Disclosure of Invention
The invention aims at the technical problems of poor control performance and low precision of the fixed air volume device in the prior art.
The invention provides a fixed air volume control method based on an impeller, which comprises the following steps:
s1, calculating the current air volume passing through the valve according to the rotating speed of the impeller;
s2, comparing and analyzing the current air volume and the preset air volume to obtain an air volume difference value;
and S3, converting the air volume difference into the corresponding rotating speed of the impeller so as to realize closed-loop feedback control of the impeller.
Preferably, after the impeller is stopped, the rotating speed of the last stable operation is automatically saved and is referred to for use in the next restart.
Preferably, the S3 specifically includes: and converting the rotating speed and the torque corresponding to the impeller according to the air volume difference, and controlling the rotating speed and the torque in a closed loop manner to automatically adjust and control the current air volume of the valve.
Preferably, the S1 specifically includes: the wind speed measuring device obtains the rotating speed of the impeller and converts the rotating speed to obtain the current air quantity passing through the valve.
Preferably, the S3 specifically includes: the wind speed measuring device converts the air volume difference into an electric signal of the corresponding rotating speed of the impeller, and sends the electric signal to the controller, and the controller controls the rotating speed of the impeller in a closed-loop feedback mode according to the electric signal.
Preferably, when the controller performs closed-loop feedback control on the rotating speed of the impeller according to the electric signal, and when the wind pressure exceeds the control range of the valve, the controller automatically determines that the feedback adjustment is invalid.
Preferably, the impeller generates electricity to charge a storage battery when rotating, and the storage battery supplies power to the wind speed measuring device, namely the controller.
The invention also provides a fixed air volume control method based on the impeller, and the system is used for realizing the fixed air volume control method based on the impeller, and specifically comprises the following steps:
the air speed measuring device is used for calculating the current air quantity passing through the valve according to the rotating speed of the impeller and comparing and analyzing the current air quantity with the preset air quantity to obtain an air quantity difference value; then converting the air volume difference into an electric signal of the corresponding rotating speed of the impeller, and sending the electric signal to a controller;
and the controller is used for carrying out closed-loop feedback control on the rotating speed of the impeller according to the electric signal.
Has the beneficial effects that: the invention provides a fixed air volume control method and a fixed air volume control system based on an impeller, wherein the method comprises the following steps: calculating the current air quantity passing through the valve according to the rotating speed of the impeller; comparing and analyzing the current air volume and the preset air volume to obtain an air volume difference value; and converting the air volume difference into the corresponding rotating speed of the impeller so as to realize closed-loop feedback control on the impeller. By improving the measuring mode and the throttling mode, the defects of poor control performance and low precision of the conventional air quantity determining device are overcome, and the control precision of the air quantity determining device is improved. The self-adaptive control of the air quantity can be realized, the stability of the air quantity is ensured, and the resistance loss of the system is reduced.
Drawings
Fig. 1 is a flow chart of a fixed air volume control method based on an impeller according to the present invention.
Detailed Description
The following detailed description of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.
Fig. 1 is a fixed air volume control method based on an impeller provided by the invention, which comprises the following steps:
s1, calculating the current air volume passing through the valve according to the rotating speed of the impeller; after the impeller is machined and formed, the rotating speed of the impeller and the air volume have a corresponding relation, the relation can be obtained through theoretical calculation or measurement, and the method belongs to the prior art. Therefore, according to the principle of measuring the wind speed by an impeller, the wind quantity passing through the valve at present is obtained by measuring the rotating speed of the impeller and calculating.
S2, comparing and analyzing the current air volume with the preset air volume to obtain an air volume difference value; the calculated air volume is compared with the set air volume to obtain the torque required to be throttled, the torque is controlled in a power generation mode, and the air volume required to be set is obtained.
Specifically, a preset air volume, that is, an air volume required in actual work is stored in advance. The difference between the preset air volume and the current air volume forms an air volume difference value which is the volume to be adjusted. And if the current air volume is smaller than the preset air volume, correspondingly adjusting to accelerate the rotating speed of the impeller, otherwise, correspondingly adjusting to reduce the rotating speed of the impeller.
And S3, converting the air volume difference into the corresponding rotating speed of the impeller so as to realize closed-loop feedback control on the impeller. The whole operation is closed loop from the collection of the impeller rotating speed, the calculation of the air volume, the comparison and the feedback control of the impeller rotating speed, and the automatic control is realized without external interference.
The scheme solves the defects of poor control performance and low precision of the conventional constant air volume device by redesigning an air speed measuring system and a throttling system of the constant air volume device.
In the preferred embodiment, after the impeller stops, the rotating speed of the last stable operation is automatically saved and is used for reference when the impeller is restarted next time. The valve can memorize the torque of the last stable operation after the ventilation is stopped, so that the air quantity can be controlled at any time.
In a preferred embodiment, the wind volume difference is converted into a corresponding rotation speed of the impeller to realize closed-loop feedback control on the impeller, specifically comprising: and converting the rotating speed and the torque corresponding to the impeller according to the air volume difference, and controlling the rotating speed and the torque in a closed loop manner to automatically adjust and control the current air volume of the valve. And according to the actual engineering requirement, calculating to obtain the rotating speed by adopting the relationship between the rotating speed of the impeller and the air volume according to the air volume difference value. And the corresponding torque can be obtained through calculation according to the actual engineering requirement, and the control of the impeller can be realized according to the corresponding rotating speed and the corresponding torque.
In a preferred embodiment, the wind speed measuring device converts the wind volume difference into an electric signal of the corresponding rotating speed of the impeller, and sends the electric signal to the controller, and the controller performs closed-loop feedback control on the rotating speed of the impeller according to the electric signal. The principle of the wind speed measuring device is mainly that wind speed is measured according to the rotating speed of an impeller, then the rotating speed of the impeller is converted through a photoelectric signal, and then the wind volume is obtained through the characteristics of a built-in system. Then, a deviation signal is obtained by comparing with the stored set value of the air volume, and the resistance of the impeller is set again according to the signal to ensure that the air volume reaches the set value.
In a preferred embodiment, when the controller performs closed-loop feedback control on the rotating speed of the impeller according to the electric signal, and when the wind pressure exceeds the control range of the valve, the feedback regulation is automatically judged to be invalid. And a transition excess control damage system is placed to play a self-protection role.
In a preferred embodiment, the impeller generates electricity to charge a battery when rotating, and the battery supplies power to the wind speed measuring device, i.e. the controller. Through installing a miniature battery, because the impeller can produce the torque and make the system produce the electric energy simultaneously, send back miniature battery and guarantee that the battery lasts work. Then the air quantity is set, and then the impeller is pushed by wind power to carry out the self-control air channel flow of the system.
The embodiment of the invention also provides a fixed air volume control method based on the impeller, and the system is used for realizing the fixed air volume control method based on the impeller and specifically comprises the following steps:
the air speed measuring device is used for calculating the current air quantity passing through the valve according to the rotating speed of the impeller and comparing and analyzing the current air quantity with the preset air quantity to obtain an air quantity difference value; then converting the air volume difference into an electric signal of the corresponding rotating speed of the impeller, and sending the electric signal to a controller;
and the controller is used for carrying out closed-loop feedback control on the rotating speed of the impeller according to the electric signal.
The principle of the wind speed measuring device is mainly that wind speed is measured according to the rotating speed of an impeller, then the rotating speed of the impeller is converted through a photoelectric signal, and then the wind volume is obtained through the characteristics of a built-in system. Then, a deviation signal is obtained by comparing with the stored set value of the air volume, and the resistance of the impeller is set again according to the signal to ensure that the air volume reaches the set value. The device repeats the automatic detection and adjustment operations after each shutdown and restart.
And the system repeats the automatic detection and adjustment operations after each shutdown and restart.
Has the beneficial effects that: the invention provides a fixed air volume control method and a fixed air volume control system based on an impeller, wherein the method comprises the following steps: calculating the current air quantity passing through the valve according to the rotating speed of the impeller; comparing and analyzing the current air volume and the preset air volume to obtain an air volume difference value; and converting the air volume difference into the corresponding rotating speed of the impeller according to the air volume difference so as to realize closed-loop feedback control on the impeller. By improving the measurement mode and the throttling mode, the defects of poor control performance and low precision of the existing air quantity determining device are overcome, and the control precision of the air quantity determining device is improved. The self-adaptive control of the air quantity can be realized, the stability of the air quantity is ensured, and the resistance loss of the system is reduced.
It should be noted that, in the foregoing embodiments, the description of each embodiment has an emphasis, and reference may be made to the related description of other embodiments for a part that is not described in detail in a certain embodiment.
As will be appreciated by one skilled in the art, 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 computer, 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.
While the preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (8)
1. A fixed air volume control method based on an impeller is characterized by comprising the following steps:
S1, calculating the current air volume passing through the valve according to the rotating speed of the impeller;
s2, comparing and analyzing the current air volume and the preset air volume to obtain an air volume difference value;
and S3, converting the air volume difference into the corresponding rotating speed of the impeller so as to realize closed-loop feedback control of the impeller.
2. The fixed air volume control method based on the impeller according to claim 1, wherein after the impeller is stopped, the rotation speed of the last stable operation is automatically saved and is used for reference in the next restart.
3. The method for controlling a fixed air volume based on an impeller according to claim 1, wherein the step S3 specifically includes: and converting the rotating speed and the torque corresponding to the impeller according to the air volume difference, and controlling the rotating speed and the torque in a closed loop manner to automatically adjust and control the current air volume of the valve.
4. The method for controlling a fixed air volume based on an impeller according to claim 1, wherein the step S1 specifically includes: the wind speed measuring device obtains the rotating speed of the impeller and converts the rotating speed to obtain the current air quantity passing through the valve.
5. The method for controlling a fixed air volume based on an impeller according to claim 4, wherein the step S3 specifically comprises: the wind speed measuring device converts the air volume difference into an electric signal of the corresponding rotating speed of the impeller, and sends the electric signal to the controller, and the controller controls the rotating speed of the impeller in a closed-loop feedback mode according to the electric signal.
6. The fixed air volume control method based on the impeller according to claim 5, wherein when the controller performs closed-loop feedback control on the rotating speed of the impeller according to the electric signal, when the air pressure exceeds the control range of the valve, the feedback adjustment is automatically determined to be invalid.
7. The method for controlling the fixed wind amount based on the impeller according to claim 4, wherein the impeller generates electricity to charge a storage battery when rotating, and the storage battery supplies power to the wind speed measuring device, i.e. the controller.
8. An impeller-based constant air volume control method, characterized in that the system is used for realizing the impeller-based constant air volume control method according to any one of claims 1-7, and specifically comprises the following steps:
the air speed measuring device is used for calculating the current air quantity passing through the valve according to the rotating speed of the impeller and comparing and analyzing the current air quantity with the preset air quantity to obtain an air quantity difference value; then converting the air volume difference into an electric signal of the corresponding rotating speed of the impeller, and sending the electric signal to a controller;
and the controller is used for carrying out closed-loop feedback control on the rotating speed of the impeller according to the electric signal.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210369664.XA CN114754019A (en) | 2022-04-08 | 2022-04-08 | Fixed air volume control method and system based on impeller |
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| CN202210369664.XA CN114754019A (en) | 2022-04-08 | 2022-04-08 | Fixed air volume control method and system based on impeller |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393041A (en) * | 2008-11-06 | 2009-03-25 | 上海理工大学 | Air volume detecting method |
| US20120157794A1 (en) * | 2010-12-20 | 2012-06-21 | Robert Goodwin | System and method for an airflow system |
| KR101676968B1 (en) * | 2015-12-10 | 2016-11-16 | 한밭대학교 산학협력단 | Method andapparatus for controlling torque of wind turbine using wind speed observer |
| CN106545962A (en) * | 2016-10-31 | 2017-03-29 | 北京艾瑞克林科技有限公司 | A kind of control method of new blower fan and its air output and exhaust air rate |
| CN107044435A (en) * | 2016-05-13 | 2017-08-15 | 周卫华 | Determine air quantity intelligent control centrifugal fan |
| JP2020145772A (en) * | 2019-03-04 | 2020-09-10 | ミネベアミツミ株式会社 | Motor drive control device, fan, and motor drive control method |
| CN113757978A (en) * | 2020-05-29 | 2021-12-07 | 佛山市威灵洗涤电机制造有限公司 | Ventilation equipment and motor control method and system with constant air volume |
-
2022
- 2022-04-08 CN CN202210369664.XA patent/CN114754019A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101393041A (en) * | 2008-11-06 | 2009-03-25 | 上海理工大学 | Air volume detecting method |
| US20120157794A1 (en) * | 2010-12-20 | 2012-06-21 | Robert Goodwin | System and method for an airflow system |
| KR101676968B1 (en) * | 2015-12-10 | 2016-11-16 | 한밭대학교 산학협력단 | Method andapparatus for controlling torque of wind turbine using wind speed observer |
| CN107044435A (en) * | 2016-05-13 | 2017-08-15 | 周卫华 | Determine air quantity intelligent control centrifugal fan |
| CN106545962A (en) * | 2016-10-31 | 2017-03-29 | 北京艾瑞克林科技有限公司 | A kind of control method of new blower fan and its air output and exhaust air rate |
| JP2020145772A (en) * | 2019-03-04 | 2020-09-10 | ミネベアミツミ株式会社 | Motor drive control device, fan, and motor drive control method |
| CN113757978A (en) * | 2020-05-29 | 2021-12-07 | 佛山市威灵洗涤电机制造有限公司 | Ventilation equipment and motor control method and system with constant air volume |
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