CN111059587A - Central flue system and sealing state detection method thereof - Google Patents
Central flue system and sealing state detection method thereof Download PDFInfo
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- CN111059587A CN111059587A CN201811206842.7A CN201811206842A CN111059587A CN 111059587 A CN111059587 A CN 111059587A CN 201811206842 A CN201811206842 A CN 201811206842A CN 111059587 A CN111059587 A CN 111059587A
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- flue
- valve body
- fan
- detection module
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2807—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for pipes
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/28—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds
- G01M3/2876—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for pipes, cables or tubes; for pipe joints or seals; for valves ; for welds for valves
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Examining Or Testing Airtightness (AREA)
- Ventilation (AREA)
Abstract
The utility model provides a central flue system, is linked together through respective tobacco pipe and public flue including installing the range hood at different floors, every range hood's air outlet all, all installs valve body, its characterized in that in every tobacco pipe: the flue fan is arranged in the common flue, the smoke pipe is provided with a flow velocity detection module for detecting the flow velocity of a pipeline where the corresponding valve body is arranged, the flue pipe also comprises an indoor unit controller for controlling the opening and closing of the valve body and a host computer controller for controlling the rotating speed or frequency of the flue fan, and the flow velocity data output by the flow velocity detection module can be transmitted to the host computer controller through the indoor unit controller. The invention also discloses a method for detecting the sealing state of the central flue system. The invention has the advantages that: the central flue system is combined with valve body sealing detection to detect the sealing conditions of the flue and the valve body, the detection method is simple and reliable, possible valve plate defects or flue cracks can be found in advance, and a good installation foundation is provided for actual use of a user.
Description
Technical Field
The invention relates to a central flue system, in particular to a central flue system and a sealing state detection method thereof.
Background
At present, floors of newly-built floors in cities are generally higher and higher, and the outlet of a high-rise common flue is generally arranged at the top of the floors, so that the outlet resistance of a system can be influenced by the switching condition of a range hood of each user, and the smoke exhaust condition of users at the bottom is severe. However, the cross-sectional area of the common flue is generally predefined by building design specifications and cannot be replaced, and if the area of the flue channel cannot be increased, the air volume is increased at once, which may cause flue blockage and increase the flow rate and noise of the whole flue system.
In addition, the user side angle-adjustable valve is combined with a roof flue outlet main fan to intensively filter and discharge and is started to be applied to certain finish-finished building plates in recent years, the roof main fan carries out frequency conversion and valve plate preset angles to achieve flow distribution aiming at different on-time users, the problem that bottom users exhaust smoke is solved to a certain extent, but the mode has higher requirement on flue tightness, and the low layer which is not good in sealing cannot exhaust smoke.
For buildings such as engineering and fine decoration, the flow distribution at the user side is realized by matching the common flue booster fan (the total air volume is controlled by changing the rotating speed in a frequency conversion or gear shifting mode) and adjusting the angle of a valve plate, because the resistance of different floors can be changed (the distance of the flue is increased to cause the loss along the way, and the opening of an upstairs valve can also influence the downstairs), the lower the floor is, the more difficult the smoke is discharged. Because the smoke exhaust mode is actually negative pressure smoke exhaust (the traditional range hood is positive pressure smoke exhaust), the rotation of the flue pressurization main fan is required to generate negative pressure in the flue, and the user side discharges smoke by means of the negative pressure difference between a kitchen and a flue port (under the condition that the indoor range hood does not have the main fan). If the flue has local leakage or the adjustable check valve is not sealed tightly, the pressure in the flue can be released, the smoke discharge of a user at the bottom is influenced, and therefore the smoke discharge of the user at a lower layer is greatly influenced by the tightness of the flue and the valve body.
Disclosure of Invention
The first technical problem to be solved by the present invention is to provide a central flue system capable of detecting the sealing performance of a valve body and the sealing performance of a flue in view of the above-mentioned prior art.
The second technical problem to be solved by the present invention is to provide a simple and reliable method for detecting the sealing state of the central flue system in view of the above-mentioned current state of the prior art.
The technical scheme adopted by the invention for solving the first technical problem is as follows: this central flue system, including installing the range hood on different floors, the air outlet of every range hood all is linked together through respective tobacco pipe and public flue, all installs valve body, its characterized in that in every tobacco pipe: the flue gas purification device comprises a common flue, a flue fan, a flow rate detection module, an indoor unit controller and a host computer controller, wherein the flue fan is arranged in the common flue, the flow rate detection module is arranged on the flue pipe and used for detecting the flow rate of a pipeline where a corresponding valve body is arranged, the indoor unit controller is used for controlling the valve body to be opened and closed, the host computer controller is used for controlling the rotating speed or frequency of the flue fan, and the flow rate data output by the flow rate detection module can be transmitted to the host computer controller through the indoor.
The flow rate detection module can be arranged at various positions of the smoke pipe, and is preferably arranged at the front end or the rear end of the valve body (4).
A method for detecting the sealing state of a central flue system is characterized by comprising the following steps: firstly, valve body leakage detection is carried out, and then flue tightness detection is carried out.
Preferably, the valve body leak detection comprises the steps of:
①, all valve bodies are closed, and the flue fan is started to a certain rotating speed n0 to operate;
②, acquiring the flow rate of the pipeline where the corresponding valve body is located through the flow rate detection module;
③, sequencing the flow rate data transmitted by the intelligent distribution valve body by the host controller;
④, judging whether the flow rate under the valve closing condition is in the built-in range according to the sorting table, if the flow rate is out of the range, judging that the leakage exists, and prompting the inspection.
The technical scheme adopted by the invention for solving the second technical problem is as follows: the method for detecting the sealing state of the central flue system is characterized by comprising the following steps of:
①, when any valve is opened to a certain angle and other valve bodies are closed, the central fan is opened to a certain rotating speed n1 to operate;
②, acquiring the flow speed V1 of the pipeline where the valve body is opened currently through the flow speed detection module;
③, the central fan is started to a certain rotation speed n2 for operation;
④, acquiring the flow speed V2 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑤, the central fan is started to a certain rotation speed n3 for operation;
⑥, acquiring the flow speed V3 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑦, solving
Calculating to obtain K1 and K2 values;
⑧, judgment
Whether the value is close to 1, if the value of | K1/K2-1| is less than or equal to m (m is 0.02,0.07]) And considering that the main fan similarity law is still established, the resistance coefficient is unchanged, the sealing is good, and if K exceeds the range, the flue is indicated to have leakage, and the inspection is prompted.
Compared with the prior art, the invention has the advantages that: the central flue system is capable of passing; the flow velocity detection module can detect the tightness of the valve body and the tightness of the flue by matching with the host controller, the resistance should be constant under the sealed condition of the valve body in a fully closed state, the whole fan runs according to the principle of a similar law, the tightness of the flue and the valve body is detected by combining the valve body sealing detection, the detection method is simple and reliable, the possible valve block defect or flue crack can be found in advance, and a good installation foundation is provided for the practical use of a user.
Drawings
FIG. 1 is a schematic structural view of an overall flue system according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a flue system of a single range hood according to an embodiment of the present invention;
FIG. 3 is a structural cross-sectional view of a single extractor hood in accordance with an embodiment of the present invention;
FIG. 4 is a functional block diagram according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of another functional module according to an embodiment of the present invention;
fig. 6 is a flowchart of a sealing state detection method according to an embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the accompanying examples.
As shown in fig. 1 to 5, the central flue system in this embodiment is installed in the range hoods 1 on different floors, each range hood 1 includes a fan 11, an air outlet of each range hood 1 is communicated with the common flue 3 through a respective smoke tube 2, a valve body 4 is installed in each smoke tube 2, a flow rate detection module 6 for detecting the flow rate of the pipeline where the corresponding valve body 4 is located is installed on the smoke tube 2, and the flow rate detection module 6 may be installed at the front end of the valve body 4 or at the rear end of the valve body 4. An indoor machine controller 7 for controlling the opening and closing of the valve body is further installed on the smoke pipe 2, the indoor machine controller 7 is electrically connected with the flow rate detection module 6, and the indoor machine controller 7 drives the valve plate 42 of the valve body 4 to open and close through controlling the valve plate driving module 41.
A flue fan 5 is installed in the public flue 3, a host controller 8 is installed on the roof, the host controller 8 is communicated with an indoor unit controller 7 through a wireless module 9, and flow speed data output by the flow speed detection module 6 can be transmitted to the host controller 8 through the indoor unit controller 7. In addition, the host controller 8 controls the rotational speed and frequency of the flue gas fan 5 through a flue gas fan drive module 10.
In addition, a filtering device 12 is installed in the common flue 3, the filtering device 12 is arranged at the front end of the air inlet of the central fan 6, and the oil smoke in the common flue 3 is purified by the filtering device 12 and then is discharged from the outlet of the common flue 3. The outlet of the smoke tube 2 is provided with a fire damper 13.
As shown in fig. 6, in the method for detecting the sealing state of the central flue system, the valve body leakage is first detected, and then the flue sealability is detected.
Wherein, valve body leakage detection includes the following steps:
①, all valve bodies are closed, and the flue fan is started to a certain rotating speed n0 to operate;
②, acquiring the flow rate of the pipeline where the corresponding valve body is located through the flow rate detection module;
③, sequencing the flow rate data transmitted by the intelligent distribution valve body by the host controller;
④, judging whether the flow rate under the valve closing condition is in the built-in range according to the sorting table, if the flow rate is out of the range, judging that the leakage exists, and prompting the inspection.
The flue tightness detection method comprises the following steps:
①, when any valve is opened to a certain angle and other valve bodies are closed, the central fan is opened to a certain rotating speed n1 to operate;
②, acquiring the flow speed V1 of the pipeline where the valve body is opened currently through the flow speed detection module;
③, the central fan is started to a certain rotation speed n2 for operation;
④, acquiring the flow speed V2 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑤, the central fan is started to a certain rotation speed n3 for operation;
⑥, acquiring the flow speed V3 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑦, solving
Calculating to obtain K1 and K2 values;
⑧, judgment
Whether the value is close to 1, if the value of | K1/K2-1| is less than or equal to m (m is 0.02,0.07]) And considering that the main fan similarity law is still established, the resistance coefficient is unchanged, the sealing is good, and if K exceeds the range, the flue is indicated to have leakage, and the inspection is prompted.
As can be seen from the flowchart of FIG. 6, if the suspected leakage valve index determined in step ④ of valve body leakage detection is within the normal range, it indicates that the valve body is not leaking, and then the step ① of flue tightness detection is performed.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many modifications or improvements may be made to the present invention without departing from the principle of the present invention, for example, a fan may not be installed inside the range hood, and these are all considered to be within the protection scope of the present invention.
Claims (5)
1. The utility model provides a central flue system, is including installing range hood (1) at different floors, and the air outlet of every range hood (1) all is linked together with public flue (3) through respective tobacco pipe (2), all installs valve body (4), its characterized in that in every tobacco pipe (2): the flue gas purification device is characterized in that a flue fan (5) is installed in the public flue (3), a flow speed detection module (6) used for detecting the flow speed of a pipeline where the corresponding valve body (4) is located is installed on the smoke pipe (2), the flue gas purification device further comprises an indoor unit controller (7) used for controlling the valve body (4) to be opened and closed and a host computer controller (8) used for controlling the rotating speed or the frequency of the flue fan, and flow speed data output by the flow speed detection module (6) can be transmitted to the host computer controller (8) through the indoor unit controller (7).
2. The central flue system of claim 1 wherein: the flow velocity detection module (6) is installed at the front end or the rear end of the valve body (4).
3. A method of detecting a sealing state of a central flue system according to claim 1, wherein: firstly, valve body leakage detection is carried out, and then flue tightness detection is carried out.
4. The method of claim 3, wherein the valve body leak detection comprises the steps of:
①, all valve bodies are closed, and the flue fan is started to a certain rotating speed n0 to operate;
②, acquiring the flow rate of the pipeline where the corresponding valve body is located through the flow rate detection module;
③, sequencing the flow rate data transmitted by the intelligent distribution valve body by the host controller;
④, judging whether the flow rate under the valve closing condition is in the built-in range according to the sorting table, if the flow rate is out of the range, judging that the leakage exists, and prompting the inspection.
5. The method of claim 4, wherein the flue seal test comprises the steps of:
①, when any valve is opened to a certain angle and other valve bodies are closed, the central fan is opened to a certain rotating speed n1 to operate;
②, acquiring the flow speed V1 of the pipeline where the valve body is opened currently through the flow speed detection module;
③, the central fan is started to a certain rotation speed n2 for operation;
④, acquiring the flow speed V2 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑤, the central fan is started to a certain rotation speed n3 for operation;
⑥, acquiring the flow speed V3 of the pipeline where the valve body is opened currently through the flow speed detection module;
⑦, solving
Calculating to obtain K1 and K2 values;
⑧, judgment
Whether the value is close to 1, if the value of | K1/K2-1| is less than or equal to m (m is 0.02,0.07]) And considering that the main fan similarity law is still established, the resistance coefficient is unchanged, the sealing is good, and if K exceeds the range, the flue is indicated to have leakage, and the inspection is prompted.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811206842.7A CN111059587B (en) | 2018-10-17 | 2018-10-17 | Central flue system and sealing state detection method thereof |
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| CN201811206842.7A CN111059587B (en) | 2018-10-17 | 2018-10-17 | Central flue system and sealing state detection method thereof |
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| CN111059587A true CN111059587A (en) | 2020-04-24 |
| CN111059587B CN111059587B (en) | 2021-10-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524664A (en) * | 2020-11-19 | 2021-03-19 | 华帝股份有限公司 | Air volume control method and system for central flue system |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09145527A (en) * | 1995-11-21 | 1997-06-06 | Tokyo Gas Co Ltd | Method for detecting leak in multi-branched piping system arranged in house |
| DE20121330U1 (en) * | 2001-03-07 | 2002-07-25 | Woehler Mesgeraete Kehrgeraete | Measuring device for determining a leak rate |
| CN2627485Y (en) * | 2003-07-07 | 2004-07-21 | 兰州泰得燃烧设备工程有限公司 | Fluid medium leakage detection device |
| CN101532901A (en) * | 2009-04-13 | 2009-09-16 | 苏州工业设备安装集团有限公司 | Air leakage amount testing device of clean air conditioning system |
| CN201348557Y (en) * | 2009-01-23 | 2009-11-18 | 广东省建筑科学研究院 | Air leakage rate field test apparatus for air conditioner |
| CN201607311U (en) * | 2010-01-06 | 2010-10-13 | 江苏省建筑工程集团有限公司 | Air pipe air leakage testing device |
| CN203203771U (en) * | 2013-04-25 | 2013-09-18 | 天津三建建筑工程有限公司安装分公司 | Air leakage testing device for single-section air duct and component thereof in ventilation and air conditioning system |
| CN104006936A (en) * | 2014-06-05 | 2014-08-27 | 山东省产品质量检验研究院 | Device and method for detecting air leakage and fireproof performance of fireproof valve |
| CN203965113U (en) * | 2014-06-27 | 2014-11-26 | 中建三局第一建设工程有限责任公司 | A kind of pipeline pressure testing device |
| US20150073732A1 (en) * | 2013-09-06 | 2015-03-12 | Carrier Corporation | System and method for measuring duct leakage in a hvac system |
| CN204554925U (en) * | 2015-01-25 | 2015-08-12 | 王克俭 | Residential building kitchen fume discharges system |
| CN205538127U (en) * | 2015-12-09 | 2016-08-31 | 北京瑞利恒安科技有限责任公司 | Airtight valve gas tightness detection device |
| CN107806971A (en) * | 2017-11-29 | 2018-03-16 | 重庆赛格尔汽车配件有限公司 | A kind of air tightness detection system |
| CN108050394A (en) * | 2017-12-08 | 2018-05-18 | 重庆科技学院 | Fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform |
| CN108072100A (en) * | 2018-01-04 | 2018-05-25 | 浙江大学 | Floor heating pipeline leak detecting device and detection method |
| CN207816529U (en) * | 2018-03-08 | 2018-09-04 | 湖北建研测控集团有限公司 | A kind of portable kitchen toilet flue draught detection device |
-
2018
- 2018-10-17 CN CN201811206842.7A patent/CN111059587B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09145527A (en) * | 1995-11-21 | 1997-06-06 | Tokyo Gas Co Ltd | Method for detecting leak in multi-branched piping system arranged in house |
| DE20121330U1 (en) * | 2001-03-07 | 2002-07-25 | Woehler Mesgeraete Kehrgeraete | Measuring device for determining a leak rate |
| CN2627485Y (en) * | 2003-07-07 | 2004-07-21 | 兰州泰得燃烧设备工程有限公司 | Fluid medium leakage detection device |
| CN201348557Y (en) * | 2009-01-23 | 2009-11-18 | 广东省建筑科学研究院 | Air leakage rate field test apparatus for air conditioner |
| CN101532901A (en) * | 2009-04-13 | 2009-09-16 | 苏州工业设备安装集团有限公司 | Air leakage amount testing device of clean air conditioning system |
| CN201607311U (en) * | 2010-01-06 | 2010-10-13 | 江苏省建筑工程集团有限公司 | Air pipe air leakage testing device |
| CN203203771U (en) * | 2013-04-25 | 2013-09-18 | 天津三建建筑工程有限公司安装分公司 | Air leakage testing device for single-section air duct and component thereof in ventilation and air conditioning system |
| US20150073732A1 (en) * | 2013-09-06 | 2015-03-12 | Carrier Corporation | System and method for measuring duct leakage in a hvac system |
| CN104006936A (en) * | 2014-06-05 | 2014-08-27 | 山东省产品质量检验研究院 | Device and method for detecting air leakage and fireproof performance of fireproof valve |
| CN203965113U (en) * | 2014-06-27 | 2014-11-26 | 中建三局第一建设工程有限责任公司 | A kind of pipeline pressure testing device |
| CN204554925U (en) * | 2015-01-25 | 2015-08-12 | 王克俭 | Residential building kitchen fume discharges system |
| CN205538127U (en) * | 2015-12-09 | 2016-08-31 | 北京瑞利恒安科技有限责任公司 | Airtight valve gas tightness detection device |
| CN107806971A (en) * | 2017-11-29 | 2018-03-16 | 重庆赛格尔汽车配件有限公司 | A kind of air tightness detection system |
| CN108050394A (en) * | 2017-12-08 | 2018-05-18 | 重庆科技学院 | Fuel gas pipeline leakage based on sound pressure signal identification detects positioning experiment platform |
| CN108072100A (en) * | 2018-01-04 | 2018-05-25 | 浙江大学 | Floor heating pipeline leak detecting device and detection method |
| CN207816529U (en) * | 2018-03-08 | 2018-09-04 | 湖北建研测控集团有限公司 | A kind of portable kitchen toilet flue draught detection device |
Non-Patent Citations (1)
| Title |
|---|
| 蔡宇武等: "防火阀门漏风量试验分析", 《消防设备研究》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112524664A (en) * | 2020-11-19 | 2021-03-19 | 华帝股份有限公司 | Air volume control method and system for central flue system |
| CN112524664B (en) * | 2020-11-19 | 2023-02-17 | 华帝股份有限公司 | Air volume control method and system for central flue system |
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| Publication number | Publication date |
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| CN111059587B (en) | 2021-10-01 |
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