CN108731210B - Full-range high-precision air quantity adjusting device - Google Patents
Full-range high-precision air quantity adjusting device Download PDFInfo
- Publication number
- CN108731210B CN108731210B CN201810801392.XA CN201810801392A CN108731210B CN 108731210 B CN108731210 B CN 108731210B CN 201810801392 A CN201810801392 A CN 201810801392A CN 108731210 B CN108731210 B CN 108731210B
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- adjusting
- air quantity
- fine
- valve
- air
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- 230000001105 regulatory effect Effects 0.000 claims abstract description 68
- 238000000034 method Methods 0.000 claims abstract description 8
- 230000007246 mechanism Effects 0.000 claims description 64
- 238000009423 ventilation Methods 0.000 abstract description 5
- 230000033228 biological regulation Effects 0.000 description 20
- 238000004378 air conditioning Methods 0.000 description 3
- 230000001276 controlling effect Effects 0.000 description 3
- 230000008844 regulatory mechanism Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000012864 cross contamination Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 208000015181 infectious disease Diseases 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air-Flow Control Members (AREA)
- Flow Control (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention discloses a full-range high-precision air quantity adjusting device which comprises an air pipeline, wherein two air quantity adjusting valves are arranged between the inner walls of the air pipeline, and the two air quantity adjusting valves are respectively a fine air quantity adjusting valve and a coarse air quantity adjusting valve, so that stable air quantity adjusting process is realized. The opening degree of the fine air quantity regulating valve is reduced along with the increase of the opening degree of the coarse air quantity regulating valve, and the opening degree of the fine air quantity regulating valve is increased along with the decrease of the opening degree of the coarse air quantity regulating valve. The invention combines the coarse adjustment and the fine adjustment to adjust, and can effectively solve the problems that the whole accuracy of the air volume adjustment in the existing ventilation industry is poor, the adaptability of the adjustment in different air volume ranges is poor, and the accuracy cannot be stabilized in the adjustment range.
Description
Technical Field
The invention relates to the technical field of air quantity regulation, in particular to a full-range high-precision air quantity regulating device.
Background
The accuracy of stable air quantity adjustment in air conditioning systems in the industries of medicine, electronics, operating rooms, food and the like is critical to stable and energy-saving operation of the whole system, the air quantity is the air quantity of a pipeline which is adjusted by adjusting the opening of a valve, and the accuracy of the air quantity adjustment by the adjusting valve is related to the operation risks of the whole air conditioning system, such as stability, cross contamination, operating room infection and the like. The ventilation system needs to realize stable adjustment of different working air volume ranges, so that the air volume adjusting device needs to be capable of realizing stable adjustment under different air volume setting requirements such as low air volume, normal air volume, high air volume and the like. The adjustment accuracy of the air volume adjusting device is very important for the whole purifying air conditioning system.
CN207111950U discloses an air quantity regulating valve, including valve body, blade, regulating gear and rotation axis, the blade is located the cavity of intercommunication valve body both sides outer space to be connected with the rotation axis, the rotation axis supports on the both sides wall of valve body, and the rotation axis passes the lateral wall of valve body at one end, is connected with the regulating gear that is located the valve body outside, and when regulating gear rotated, can drive the rotation axis rotation to drive the blade rotation, with the angle of opening and shutting of regulating blade. The opening and closing angles of the blades are adjusted in a split mode by adopting the mutually meshed adjusting gears, so that the flow adjusting range is enlarged, and the adjusting precision is improved.
CN205037522U discloses a convenient air supply outlet of air regulation, it has a box that is equipped with the air intake, and high-efficient filter sets up in this box, and the bottom half is equipped with the diffuser, is equipped with air regulation mechanism on this box, and this air regulation mechanism is connected with air regulation pole and air regulation blade, makes the air regulation blade that sets up on this air regulation mechanism rotate through rotating air regulation pole for air regulation blade's angle changes, reaches the purpose of adjusting the air variation. The air quantity adjusting structure changes the position and the method of original air quantity adjustment, integrates the high-efficiency air supply port and the air quantity adjusting valve, greatly lightens the working strength of debugging workers when the clean room is debugged, and can effectively prevent the sealing of the clean room.
As shown in fig. 1, a conventional damper adjusts the air volume. The air quantity is adjusted by adjusting the ventilation area in the valve body through the opening degree C of the air quantity adjusting valve plate. The adjusting precision of the air quantity adjusting valve is related to the adjusting performance of the whole air quantity adjusting.
As shown in fig. 3, the air quantity adjusting valve plate works in different opening ranges and has different adjusting precision, the adjusting precision difference of the whole working area is larger, the adjusting precision of the valves in different opening ranges is different, each valve has the adjusting precision determined by the structure of the valve, and the adjusting precision in the working area is better. The air quantity regulating valve has higher regulating precision in a working area with 40-60% of opening, and the precision is low when the air quantity regulating valve is in a low-opening working area and a high-opening working area.
When the air quantity is stably regulated at 2000M3/H by the air quantity regulating valve, the working opening degree of the valve is about 20 percent, and the precision of the air quantity regulating valve is lower; when stable adjustment of the air quantity at 4000M3/H is realized, the working opening degree of the valve is about 50%, and the adjustment precision is good; when stable adjustment of the air quantity at 8000M3/H is realized, the working opening degree of the valve is about 80%, and the precision of the air quantity adjusting valve is low;
the air volume adjustment cannot realize high-precision adjustment under different air volume control requirements.
The current air quantity adjusting technology cannot realize high-precision adjustment under different air quantity requirements, when the large air quantity is required to be stably adjusted, the opening of the working area of the adjusting valve plate is large, when the small air quantity is realized to be stably adjusted, the opening of the working area of the adjusting valve is small, the working area of the adjusting valve plate can be changed due to the requirements of different air quantity control ranges, and the whole air quantity adjustment cannot be stored for stable precision. The adjusting precision of the air quantity adjusting valve is not linear, which is determined by the air quantity adjusting valve and the air flow characteristic, so that the stable high-precision adjustment in the whole range can not be realized, and the good valve manufacturing process can not change the characteristic.
Therefore, the adjusting precision of any air quantity adjusting device in the prior art is in a range, and the high-precision adjustment of different air quantity requirements in actual use cannot be met.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a full-range high-precision air volume adjusting device with adjusting precision under different air volume requirements.
The aim of the invention is achieved by the following technical scheme.
The utility model provides a full-range high accuracy air regulation device, includes the air pipe, install two air regulation valves between the inner wall of air pipe, two air regulation valves are thin air regulation valve and thick air regulation valve respectively, in the regulation process that realizes stable amount of wind the aperture of thin air regulation valve reduces along with the aperture increase of thick air regulation valve, the aperture of thin air regulation valve reduces along with the aperture of thick air regulation valve and increases.
Further, the fine air quantity adjusting valve is provided with a fine adjusting mechanism, and the coarse air quantity adjusting valve is provided with a coarse adjusting mechanism.
Further, the fine adjusting mechanism is an electric adjusting mechanism or a manual adjusting mechanism, and the coarse adjusting mechanism is an electric adjusting mechanism or a manual adjusting mechanism.
Further, the fine air quantity adjusting valve comprises a group of fine adjusting valve plates, and the coarse air quantity adjusting valve comprises a group of coarse adjusting valve plates.
Further, the fine adjusting mechanism and the coarse adjusting mechanism are electric adjusting mechanisms, the fine adjusting mechanism and the coarse adjusting mechanism are respectively connected to a linkage controller, the linkage controller is used for controlling the coarse air volume adjusting valve to adjust the opening degree firstly, the opening degree of the fine air volume adjusting valve changes along with the coarse air volume adjusting valve to keep stable air volume, and the opening degree of the coarse air volume adjusting valve is kept unchanged after the opening degree of the fine air volume adjusting valve reaches a preset adjusting range, and then the fine air volume adjusting valve is controlled to adjust air volume.
Further, a fine air quantity adjusting valve and a coarse air quantity adjusting valve are sequentially arranged by taking the wind direction as the positive direction.
Compared with the prior art, the invention has the advantages that: the invention combines the coarse adjustment and the fine adjustment to adjust, and can effectively solve the problems that the whole accuracy of the air volume adjustment in the existing ventilation industry is poor, the adaptability of the adjustment in different air volume ranges is poor, and the accuracy cannot be stabilized in the adjustment range.
Drawings
Fig. 1 is a schematic diagram of a prior art structure.
Fig. 2 is a schematic structural view of the present invention.
Fig. 3 is a schematic diagram of the valve opening and the adjustment accuracy in different air volume states.
In the figure: 1. the air duct 2, the fine adjusting mechanism 3, the linkage controller 4, the coarse adjusting mechanism 5, the fine adjusting valve plate 6, the coarse adjusting valve plate 7, the air quantity adjusting mechanism 8 and the air quantity adjusting valve plate.
Detailed Description
The invention will now be described in detail with reference to the drawings and the accompanying specific examples.
As shown in fig. 1, a conventional control valve controls the air volume (the direction of the arrow is the wind direction). The air quantity is adjusted by controlling the opening degree C of the air quantity adjusting valve plate 8 through the air quantity adjusting mechanism 7 to adjust the ventilation area in the valve body. The adjusting precision of the air quantity adjusting valve is related to the adjusting performance of the whole air quantity adjusting.
Under the prior art condition, the air quantity regulating valve has different regulating precision in different working areas. The working accuracy range of the regulating valve per se is also different under different air quantity control requirements, which is determined by the structural performance of the equipment per se and the characteristics of the air flow.
As shown in fig. 3, the air quantity adjusting valve plate 8 has different adjusting precision in different opening ranges, and the whole air quantity adjusting precision is the precision of the air quantity adjusting valve in the whole adjusting range, so that the air quantity adjusting cannot perform stable precision adjustment on the air quantity in the adjusting range.
The adjustment accuracy of the air volume adjusting valve is greatly different along with the difference of the opening degree, for example, when the control position of the air volume adjusting valve is in a region of 0-20%, the adjustment accuracy of the air volume adjusting valve is about 30%. When the control position of the air quantity regulating valve is in the area of 20% -40%, the regulating precision of the air quantity regulating valve is about 20%. When the control position of the air quantity regulating valve is in the area of 40% -45%, the regulating precision of the air quantity regulating valve is about 10%. When the control position of the air quantity regulating valve is in the region of 45% -55%, the regulating precision of the air quantity regulating valve is about 5%. When the control position of the air quantity regulating valve is in the area of 55% -60%, the regulating precision of the air quantity regulating valve is about 10%. When the control position of the air quantity regulating valve is in the 60% -80% area, the regulating precision of the air quantity regulating valve is about 20%. When the control position of the air quantity regulating valve is in the area of 80% -100%, the regulating precision of the air quantity regulating valve is about 30%. (precision is used to describe that each control device has its best precision working area, and the precision of different areas is greatly different)
As shown in fig. 2, a full-range high-precision air volume adjusting device (the arrow direction is the wind direction) comprises an air duct 1, two air volume adjusting valves are installed between the inner walls of the air duct 1, the two air volume adjusting valves are respectively a fine air volume adjusting valve and a coarse air volume adjusting valve, in the adjusting process of stable air volume, the opening of the fine air volume adjusting valve is reduced along with the increase of the opening of the coarse air volume adjusting valve, and the opening of the fine air volume adjusting valve is increased along with the decrease of the opening of the coarse air volume adjusting valve.
The fine air quantity regulating valve is provided with a fine regulating mechanism 2, and the coarse air quantity regulating valve is provided with a coarse regulating mechanism 4.
The fine adjusting mechanism 2 is an electric adjusting mechanism or a manual adjusting mechanism, and the coarse adjusting mechanism 4 is an electric adjusting mechanism or a manual adjusting mechanism.
The fine air quantity regulating valve comprises a group of fine regulating valve plates 5, and the coarse air quantity regulating valve comprises a group of coarse regulating valve plates 6. The valve plate refers to a shielding object for adjusting the air quantity, and not just refers to a sheet-shaped structure.
The fine adjusting mechanism 2 and the coarse adjusting mechanism 4 are electric adjusting mechanisms, the fine adjusting mechanism 2 and the coarse adjusting mechanism 4 are respectively connected to the linkage controller 3, the linkage controller 3 is used for controlling the coarse air volume adjusting valve to adjust the opening degree firstly, the opening degree of the fine air volume adjusting valve changes along with the opening degree, the opening degree of the coarse air volume adjusting valve is kept unchanged after the opening degree of the fine air volume adjusting valve reaches a preset adjusting range, and then the opening degree of the fine air volume adjusting valve is controlled to adjust the opening degree.
The wind direction is taken as the positive direction, and a fine air quantity regulating valve and a coarse air quantity regulating valve are sequentially arranged. The fine air quantity regulating valve is arranged in front of the coarse air quantity regulating valve to avoid the interference of the turbulent air flow behind the coarse air quantity regulating valve to the fine air quantity regulating valve. If an air homogenizing device is arranged between the coarse and fine air volume adjusting valves or air turbulence between the coarse and fine air volume adjusting valves is effectively treated, the coarse air volume adjusting valve can also be arranged in front of the fine air volume adjusting valve.
The operation mode is as follows:
the high-precision adjusting area (such as the opening degree is 30% -40%) of the fine adjusting mechanism 2 is preset, the linkage controller 3 monitors or manually detects the actual opening degree of the fine adjusting mechanism 2, when the actual opening degree of the fine adjusting mechanism 2 is smaller than the high-precision adjusting area (such as the opening degree is 20%) of the fine adjusting mechanism 2, the linkage controller 3 controls the electric adjusting mechanism or controls the coarse air volume adjusting valve to adjust the opening degree through the manual adjusting mechanism, the opening degree of the fine air volume adjusting valve is reduced along with the increase of the opening degree of the coarse air volume adjusting valve, the opening degree of the fine air volume adjusting valve is increased along with the decrease of the opening degree of the coarse air volume adjusting valve, and the fine adjusting mechanism 2 is ensured to always work in the working area of high-precision adjustment. The operating position of the coarse adjustment mechanism 4 is maintained unchanged. The linkage controller 3 controls the electric regulating mechanism or the manual regulating mechanism to start the fine regulating function of the fine air regulating valve, the fine regulating mechanism 2 is utilized to realize air quantity re-precision regulation, the actual regulating area position of the fine regulating mechanism 2 is collected manually or by the linkage controller 3 as a control signal, the regulating function of the redundancy air regulating valve is controlled, the linkage regulation of the coarse regulating valve plate 6 and the fine regulating valve plate 5 is adopted, the coarse air regulating valve and the fine air regulating valve are combined as a whole to regulate the air quantity, and the high-precision regulation of the device to the full-range air quantity is realized.
Claims (3)
1. The full-range high-precision air quantity adjusting method comprises an air pipeline and is characterized in that two air quantity adjusting valves are arranged between the inner walls of the air pipeline, the two air quantity adjusting valves are respectively a fine air quantity adjusting valve and a coarse air quantity adjusting valve, in the process of adjusting stable air quantity, the opening of the fine air quantity adjusting valve is reduced along with the increase of the opening of the coarse air quantity adjusting valve, the opening of the fine air quantity adjusting valve is increased along with the decrease of the opening of the coarse air quantity adjusting valve, and the coarse air quantity adjusting valve is used for adjusting the precision working area of the fine air quantity adjusting valve;
the fine air quantity regulating valve is provided with a fine regulating mechanism, and the coarse air quantity regulating valve is provided with a coarse regulating mechanism;
the fine adjusting mechanism is an electric adjusting mechanism or a manual adjusting mechanism, and the coarse adjusting mechanism is an electric adjusting mechanism or a manual adjusting mechanism;
the fine adjusting mechanism and the coarse adjusting mechanism are respectively connected to the linkage controller, the high-precision adjusting area of the fine adjusting mechanism is preset, the linkage controller monitors or manually detects the actual opening of the fine adjusting mechanism, when the actual opening of the fine adjusting mechanism is smaller than the high-precision adjusting area of the preset fine adjusting mechanism, the linkage controller controls the electric adjusting mechanism or controls the coarse air adjusting valve to adjust the opening through the manual adjusting mechanism, the opening of the fine air adjusting valve is reduced along with the increase of the opening of the coarse air adjusting valve, the opening of the fine air adjusting valve is increased along with the decrease of the opening of the coarse air adjusting valve, the fine adjusting mechanism is ensured to always work in the working area of the high-precision adjusting mechanism, the working position of the coarse adjusting mechanism is kept unchanged at the moment, the linkage controller controls the electric adjusting mechanism or the manual adjusting mechanism to open the fine adjusting function of the fine air adjusting valve, and air quantity re-precision adjustment is achieved through the fine adjusting mechanism.
2. The full-range high-precision air quantity adjusting method according to claim 1, wherein the fine air quantity adjusting valve comprises a group of fine adjusting valve plates, and the coarse air quantity adjusting valve comprises a group of coarse adjusting valve plates.
3. The full-range high-precision air quantity adjusting method according to claim 1, wherein a fine air quantity adjusting valve and a coarse air quantity adjusting valve are sequentially arranged by taking the wind direction as a positive direction.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810801392.XA CN108731210B (en) | 2018-07-19 | 2018-07-19 | Full-range high-precision air quantity adjusting device |
| PCT/CN2019/096147 WO2020015632A1 (en) | 2018-07-19 | 2019-07-16 | Full-range high-precision air volume adjustment device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810801392.XA CN108731210B (en) | 2018-07-19 | 2018-07-19 | Full-range high-precision air quantity adjusting device |
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| Publication Number | Publication Date |
|---|---|
| CN108731210A CN108731210A (en) | 2018-11-02 |
| CN108731210B true CN108731210B (en) | 2024-02-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810801392.XA Active CN108731210B (en) | 2018-07-19 | 2018-07-19 | Full-range high-precision air quantity adjusting device |
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| Country | Link |
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| CN (1) | CN108731210B (en) |
| WO (1) | WO2020015632A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108731210B (en) * | 2018-07-19 | 2024-02-27 | 南京久诺科技有限公司 | Full-range high-precision air quantity adjusting device |
| CN110331248B (en) * | 2019-08-09 | 2022-04-15 | 天津燃洁斯工业设备有限公司 | Energy-saving regulation and control method for combustion fan of blast furnace hot blast stove |
| CN116045009A (en) * | 2023-02-07 | 2023-05-02 | 广州驰拓智能科技有限公司 | Variable air volume valve with accurate air volume adjustment function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990001058A (en) * | 1997-06-12 | 1999-01-15 | 오상수 | Air volume control device of car air conditioner |
| CN105257830A (en) * | 2015-10-21 | 2016-01-20 | 广东科艺普实验室设备研制有限公司 | Air volume adjusting valve with novel structure |
| CN107489777A (en) * | 2017-08-28 | 2017-12-19 | 珠海格力电器股份有限公司 | Volume damper, vav terminal and air-conditioning system for air channel |
| CN207388792U (en) * | 2017-10-12 | 2018-05-22 | 宁波吉利汽车研究开发有限公司 | A kind of automobile air conditioner inlet air regulating device and ventilating system |
| CN208846633U (en) * | 2018-07-19 | 2019-05-10 | 南京久诺科技有限公司 | A kind of gamut high-precision volume adjusting apparatus |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4377969A (en) * | 1980-12-08 | 1983-03-29 | Kewaunee Scientific Equipment Corp. | Automatic fume hood airflow control |
| CN205559340U (en) * | 2016-02-15 | 2016-09-07 | 湖南海盛重工科技有限公司 | Multistage centrifugal fan air speed automatic regulating apparatus |
| CN105953408A (en) * | 2016-06-29 | 2016-09-21 | 佛山市顺德区奇林电气有限公司 | Adjusting method and adjusting device for precise air inflow |
| CN207089622U (en) * | 2017-08-08 | 2018-03-13 | 珠海格力电器股份有限公司 | Air quantity variable end device and air-conditioning system |
| CN108731210B (en) * | 2018-07-19 | 2024-02-27 | 南京久诺科技有限公司 | Full-range high-precision air quantity adjusting device |
-
2018
- 2018-07-19 CN CN201810801392.XA patent/CN108731210B/en active Active
-
2019
- 2019-07-16 WO PCT/CN2019/096147 patent/WO2020015632A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR19990001058A (en) * | 1997-06-12 | 1999-01-15 | 오상수 | Air volume control device of car air conditioner |
| CN105257830A (en) * | 2015-10-21 | 2016-01-20 | 广东科艺普实验室设备研制有限公司 | Air volume adjusting valve with novel structure |
| CN107489777A (en) * | 2017-08-28 | 2017-12-19 | 珠海格力电器股份有限公司 | Volume damper, vav terminal and air-conditioning system for air channel |
| CN207388792U (en) * | 2017-10-12 | 2018-05-22 | 宁波吉利汽车研究开发有限公司 | A kind of automobile air conditioner inlet air regulating device and ventilating system |
| CN208846633U (en) * | 2018-07-19 | 2019-05-10 | 南京久诺科技有限公司 | A kind of gamut high-precision volume adjusting apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020015632A1 (en) | 2020-01-23 |
| CN108731210A (en) | 2018-11-02 |
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