CN116045420A - Multithread pressure gradient control method - Google Patents
Multithread pressure gradient control method Download PDFInfo
- Publication number
- CN116045420A CN116045420A CN202211621769.6A CN202211621769A CN116045420A CN 116045420 A CN116045420 A CN 116045420A CN 202211621769 A CN202211621769 A CN 202211621769A CN 116045420 A CN116045420 A CN 116045420A
- Authority
- CN
- China
- Prior art keywords
- exhaust
- control
- air
- air supply
- area
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/04—Ventilation with ducting systems, e.g. by double walls; with natural circulation
- F24F7/06—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
- F24F7/08—Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit with separate ducts for supplied and exhausted air with provisions for reversal of the input and output systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F7/00—Ventilation
- F24F7/003—Ventilation in combination with air cleaning
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F2110/00—Control inputs relating to air properties
- F24F2110/40—Pressure, e.g. wind pressure
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Signal Processing (AREA)
- Fuzzy Systems (AREA)
- Mathematical Physics (AREA)
- Control Of Positive-Displacement Air Blowers (AREA)
Abstract
The application discloses a multithread pressure gradient control method which is applied to a multi-feed multi-row large-range negative pressure region control system, and divides an overall region into a plurality of independent negative pressure control regions, wherein the control method comprises single-region negative pressure control and system variable exhaust control; on the premise of constant air supply quantity, the single-area negative pressure control ensures the flow of air from high pressure to low pressure by adjusting the valve position of the air exhaust valve, thereby ensuring the pressure gradient meeting the requirements; the variable exhaust control of the system is specifically that a control strategy is formed by valve position control of an exhaust valve and variable frequency control of a fan, and is corrected through state feedback to form a closed-loop control logic. The method of fixed air supply and variable air exhaust realizes the directional movement of the negative pressure flow field of the whole area, and meanwhile, the pressure gradient function is realized by means of the adjustment of the air supply valve and the air exhaust valve in each area.
Description
Technical Field
The application relates to a multithread pressure gradient control method, which is applied to a multi-feed multi-row type large-range negative pressure region control system, solves the control problems that series flow among regions, exhaust air cannot be discharged from the lowest pressure position and the like, and belongs to the technical field of marine ventilation.
Background
The main body of the negative pressure area for the ship is established by pressure gradients among a plurality of single areas, gradient sorting is carried out according to the toxicity of pollutants, and an air supply and exhaust system is generally used for one-supply one-row ventilation, and is shown in fig. 1. The negative pressure gradient control method is simple, is only suitable for a single-thread system, is influenced by epidemic situations in recent years, and the atmospheric environment control system of the ship brings forward the requirement of realizing a negative pressure area for a large-scale personnel living area.
Disclosure of Invention
The technical problem to be solved by the application is that the air supply and exhaust pipelines are correspondingly increased in each middle area relative to one air supply and one air exhaust pipeline to reduce the total air supply and total air exhaust load, but because the air supply fan and the exhaust fan are commonly used in all areas, the problem that independent negative pressure control is difficult to realize in all areas exists.
In order to solve the technical problems, the technical scheme of the application is to provide a multithread pressure gradient control method which is applied to a multi-feed multi-row type large-range negative pressure area control system and divides an integral area into a plurality of independent negative pressure control areas; the system comprises a blower and an exhaust fan, wherein the blower is connected with a main air supply pipeline, the main air supply pipeline supplies air to each region through independent branch air supply pipelines, independent air supply valves are arranged on each branch air supply pipeline, independent exhaust branch pipelines are arranged in each region, independent exhaust valves are arranged on each branch exhaust pipeline, all the exhaust branch pipelines are summarized to the main air supply pipeline, and the main air exhaust pipeline is connected with the exhaust fan;
the control method comprises single-area negative pressure control and system variable exhaust control;
the single-area negative pressure control is specifically to set a valve position of a single-area air supply valve on the premise of fixed air supply quantity, when pressure fluctuation exists in the environment of the area, the differential air quantity is adjusted by adjusting the valve position of an air exhaust valve and increasing and decreasing the air exhaust quantity, so that the flow quantity of air from high pressure to low pressure is ensured, and the pressure gradient meeting the requirement is ensured;
the variable exhaust control of the system is specifically that a control strategy is formed by valve position control of an exhaust valve and variable frequency control of a fan: measuring the front-back pressure difference of each exhaust valve, judging whether each exhaust valve is in a reasonable use interval, and performing primary judgment on the state of each exhaust branch pipeline; and summarizing the valve position judgment results of the exhaust valves of all the exhaust branch pipes, judging the total exhaust amount requirement, adjusting the frequency of the exhaust fan to control the state of the exhaust main pipeline, adjusting the front-rear pressure difference of the exhaust valves of all the exhaust branch pipes, and correcting through the next wheel shape feedback of each exhaust branch pipe to form a closed loop control logic.
Preferably, the fixed air supply amount is to sum air quantity set values of all air supply valves to obtain total air quantity required by the system currently, calculate the rotating speed of the blower according to a fitting formula of the rotating speed corresponding to the specific model of the blower and the air quantity, and perform variable frequency regulation on the blower according to the rotating speed.
Preferably, in the single-area negative pressure control, the air quantity entering the single area is set by the valve position of the air supply valve to realize fixed air quantity air inlet; and the valve position of the exhaust valve is regulated by actually measured differential pressure signals fed back by the sensor in the area, and the exhaust amount is changed to realize differential pressure gradient control of the negative pressure area.
Preferably, in the variable exhaust control of the system, the total exhaust amount requirement is judged, and the exhaust fan frequency is adjusted to control the state of the exhaust main pipeline by PID control.
The method has the advantages that the directional movement of the negative pressure flow field of the whole area is realized by the method of fixing the air supply quantity and changing the air exhaust quantity, and meanwhile, the pressure gradient function is realized by means of the air supply valve and the air exhaust valve in each area.
Drawings
FIG. 1 is a schematic diagram of a prior art in-ship single-thread negative pressure gradient;
FIG. 2 is a schematic diagram of a multi-line Cheng Fuya gradient;
FIG. 3 is a schematic diagram of a fixed air supply control flow;
FIG. 4 is a schematic diagram of a single zone negative pressure control flow;
fig. 5 is a schematic diagram of a variable exhaust control flow.
Detailed Description
For the purposes of promoting an understanding of the principles of the invention, reference will now be made to the preferred embodiments and specific examples will be described in connection with the accompanying drawings.
The embodiment provides a novel control method aiming at the negative pressure region of the multithreaded pressure gradient so as to ensure the gradient maintenance of the large-range negative pressure region. The control method operates in the control scheme of fixed air supply and variable air exhaust according to the control concept of the air quantity of the whole area, the air supply quantity is set according to the system, the frequency of the air supply machine and the valve position of the air supply regulating valve of each area are controlled to be constant during normal system operation, and the frequency of the total exhaust fan is regulated by the negative pressure state of each area.
The whole area is divided into a plurality of independent negative pressure control areas, and taking fig. 2 as an example, the whole area is divided into an area 1, an area 2 and an area 3, and the negative pressure is sequentially enhanced. The air supply system comprises an air supply pipeline, an air supply valve, an air exhaust pipeline and an exhaust fan, wherein the air supply pipeline is connected with one or a group of air supply fans, the air supply pipeline is used for supplying air to each region through an independent air supply branch pipeline, independent air supply valves are arranged on each air supply branch pipeline, independent air exhaust valves are arranged on each air exhaust branch pipeline, all air exhaust branch pipelines are summarized to the air exhaust pipeline, and the air exhaust pipeline is connected with the exhaust fan.
For a single area, the control method adopts single-area negative pressure control, and on the premise of fixed air supply quantity, the valve position of an air supply valve of the single area is set; when the pressure fluctuation exists in the environment of the area, the valve position of the exhaust valve is properly adjusted, the air discharge quantity is increased or decreased to adjust the differential air quantity, so that the flow quantity of air from high pressure to low pressure is ensured, and the pressure gradient meeting the requirement is ensured.
For total exhaust of the system, the control method adopts system variable exhaust control, which means that a control strategy is formed by exhaust valve position control and fan variable frequency control: measuring the front-back pressure difference of each exhaust valve, judging whether each exhaust valve is in a reasonable use interval, and performing primary judgment on the state of each exhaust branch pipeline; and summarizing the valve position judgment results of the exhaust valves of all the exhaust branch pipes, judging the total exhaust amount requirement, adjusting the frequency of the exhaust fan to control the state of the exhaust main pipeline, adjusting the front-rear pressure difference of the exhaust valves of all the exhaust branch pipes, and correcting through the next wheel shape feedback of each exhaust branch pipe to form a closed loop control logic.
See, in particular, figures 3-5.
Referring to fig. 3, for the fixed air supply control in this embodiment, the air volume setting values of all air supply valves (fixed air volume valves) are summed to obtain the total air volume currently required by the system, the fan rotation speed is calculated according to the fitting formula of the rotation speed and the air volume corresponding to the specific model of the fan, and the fan is subjected to variable frequency adjustment according to the rotation speed.
Referring to fig. 4, in the single-area negative pressure control in the present embodiment, the air volume entering the negative pressure area is set by the air supply valve (fixed air volume valve) to realize fixed air volume air intake; and the valve position of an exhaust valve (variable air volume valve) is regulated by actually measuring differential pressure signals fed back by a sensor in the negative pressure region, and the exhaust volume is changed to realize differential pressure gradient control of the negative pressure region.
Referring to fig. 5, for the system variable exhaust control in this embodiment, the differential pressure between the front and rear of the exhaust valve is measured, and if the exhaust valve is within a reasonable use range, a preliminary determination can be made on the state of the exhaust branch pipe; and summarizing and uploading all exhaust branch pipe valve position judging results, judging the total exhaust amount requirement by a control system, adjusting the frequency of an exhaust fan by PID control to control the state of an exhaust main pipeline, adjusting the front-rear pressure difference of exhaust valve valves of all exhaust branch pipelines, and correcting by the feedback of the next wheel state of each exhaust branch pipe to form closed-loop control.
The multithread pressure gradient control method provided by the embodiment has the implementation effects that: under the requirement of a multithread pressure difference gradient control system, the control method realizes the directional movement of the negative pressure flow field of the whole area by a method of fixing the air supply quantity and changing the air exhaust quantity, and simultaneously realizes the pressure gradient function by means of the regulation of the air supply valve and the air exhaust valve in each area. In addition, by means of the control strategy formed by the valve position control of the exhaust valve and the variable frequency control of the fan, the common balance of the exhaust air quantity and the pressure difference gradient of the system is realized.
Claims (4)
1. The multithread pressure gradient control method is characterized by being applied to a multi-feed multi-row large-range negative pressure area control system, and dividing an integral area into a plurality of independent negative pressure control areas; the system comprises a blower and an exhaust fan, wherein the blower is connected with a main air supply pipeline, the main air supply pipeline supplies air to each region through independent branch air supply pipelines, independent air supply valves are arranged on each branch air supply pipeline, independent exhaust branch pipelines are arranged in each region, independent exhaust valves are arranged on each branch exhaust pipeline, all the exhaust branch pipelines are summarized to the main air supply pipeline, and the main air exhaust pipeline is connected with the exhaust fan;
the control method comprises single-area negative pressure control and system variable exhaust control;
the single-area negative pressure control is specifically to set a valve position of a single-area air supply valve on the premise of fixed air supply quantity, when pressure fluctuation exists in the environment of the area, the differential air quantity is adjusted by adjusting the valve position of an air exhaust valve and increasing and decreasing the air exhaust quantity, so that the flow quantity of air from high pressure to low pressure is ensured, and the pressure gradient meeting the requirement is ensured;
the variable exhaust control of the system is specifically that a control strategy is formed by valve position control of an exhaust valve and variable frequency control of a fan: measuring the front-back pressure difference of each exhaust valve, judging whether each exhaust valve is in a reasonable use interval, and performing primary judgment on the state of each exhaust branch pipeline; and summarizing the valve position judgment results of the exhaust valves of all the exhaust branch pipes, judging the total exhaust amount requirement, adjusting the frequency of the exhaust fan to control the state of the exhaust main pipeline, adjusting the front-rear pressure difference of the exhaust valves of all the exhaust branch pipes, and correcting through the next wheel shape feedback of each exhaust branch pipe to form a closed loop control logic.
2. The multithreaded pressure gradient control method of claim 1, wherein the fixed air supply quantity is that the air quantity set values of all air supply valves are summed to obtain the total air quantity required by the system currently, the rotating speed of the blower is calculated according to a fitting formula of the rotating speed corresponding to the specific model of the blower and the air quantity, and the variable frequency regulation is carried out on the blower according to the rotating speed.
3. The multi-thread pressure gradient control method as set forth in claim 1, wherein in the single-area negative pressure control, the air quantity entering the single area is set by a valve position of an air supply valve to realize fixed air quantity air inlet; and the valve position of the exhaust valve is regulated by actually measured differential pressure signals fed back by the sensor in the area, and the exhaust amount is changed to realize differential pressure gradient control of the negative pressure area.
4. The method of claim 1, wherein in the variable exhaust control of the system, the total exhaust demand is determined, and the exhaust fan frequency is adjusted to control the state of the exhaust main pipeline by using PID control.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211621769.6A CN116045420A (en) | 2022-12-16 | 2022-12-16 | Multithread pressure gradient control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211621769.6A CN116045420A (en) | 2022-12-16 | 2022-12-16 | Multithread pressure gradient control method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116045420A true CN116045420A (en) | 2023-05-02 |
Family
ID=86112393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211621769.6A Pending CN116045420A (en) | 2022-12-16 | 2022-12-16 | Multithread pressure gradient control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116045420A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116678085A (en) * | 2023-06-01 | 2023-09-01 | 四川先通医药科技有限公司 | Control method, storage medium and device of radiopharmaceutical production ventilation system |
-
2022
- 2022-12-16 CN CN202211621769.6A patent/CN116045420A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116678085A (en) * | 2023-06-01 | 2023-09-01 | 四川先通医药科技有限公司 | Control method, storage medium and device of radiopharmaceutical production ventilation system |
| CN116678085B (en) * | 2023-06-01 | 2024-04-16 | 四川先通医药科技有限公司 | Control method, storage medium and device of radiopharmaceutical production ventilation system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN116045420A (en) | Multithread pressure gradient control method | |
| CN101379280B (en) | Air intake control device of V-diesel engine | |
| EP2252784B1 (en) | Bleed airflow balancing control using simplified sensing | |
| CN1782344A (en) | Regulating valve of main and auxiliary fuel loop | |
| CA2477510A1 (en) | Dual fuel engine | |
| US20120199211A1 (en) | Airflow control system | |
| SE517494C2 (en) | Method and apparatus for controlling a supercharged internal combustion engine | |
| CN112000160A (en) | Wide-range high-precision gas pressure and flow rapid adjusting device and adjusting method thereof | |
| CN108592079A (en) | The simplified control method of various gas mixing automatic adjustment | |
| CN102301105A (en) | Method and apparatus for controlling turbine efficiency | |
| CN101462645A (en) | Automatic adjustable dragging method pipe | |
| CN212433647U (en) | Wide-range high-precision gas pressure and flow quick adjusting device | |
| US8037866B2 (en) | Method and device for controlling a suction pressure of an internal combustion engine | |
| JPS5841116B2 (en) | Sewage treatment feed gas control method | |
| CN110595790A (en) | Heater oxygenating flow adjusting and rectifying device | |
| CN206904977U (en) | The combustion gas of regulation stability of flow and precision passes through adjusting means | |
| CN209324766U (en) | Gas cushion type mud water balances quick response two-in-parallel regulating system | |
| CN109469658A (en) | A kind of gas cushion type mud water balance quick response two-in-parallel regulating system | |
| CN201136703Y (en) | Auto-adjusting laval nozzle | |
| CN219800935U (en) | Fuel cell air loop back pressure control device | |
| CN220378385U (en) | Argon-oxygen mixing device for closed cycle internal combustion engine and closed cycle internal combustion engine | |
| CN115306598B (en) | Device for uniformly feeding air to gas engine | |
| CN2426052Y (en) | Piston type pressure-reducing valve | |
| CN207033610U (en) | Fuel gas with low heat value engine blender | |
| CN206872024U (en) | A kind of thermal power plant's compressed air distribution system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |