CN107605525B - Flow guiding device and flow guiding method for tunnel jet fan - Google Patents
Flow guiding device and flow guiding method for tunnel jet fan Download PDFInfo
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- CN107605525B CN107605525B CN201711020321.8A CN201711020321A CN107605525B CN 107605525 B CN107605525 B CN 107605525B CN 201711020321 A CN201711020321 A CN 201711020321A CN 107605525 B CN107605525 B CN 107605525B
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Abstract
The invention provides a tunnel jet fan flow guiding device and a flow guiding method, wherein the tunnel jet fan flow guiding device comprises: a guiding device shell (9), a guiding device rotating shaft (11) and guiding device guiding vanes (6); an air inlet of the guide device shell (9) is fixedly connected with a jet fan outlet (5) of the jet fan (4); the angle of the guide vane of the guide device can be adjusted. The advantages are that: under the condition that the height of the tunnel building is not changed, the efficiency of the jet fan can be effectively improved by arranging the flow guiding device at the outlet end of the jet fan, and the method has good application prospect for tunnels with limited tunnel building heights; the device can also be applied to the situation that a large barrier in front of the jet fan cannot avoid, so that the ventilation air flow of the tunnel is improved. By changing the outlet airflow direction of the jet fan, the distance of the main hole formed by the high-speed airflow of the jet fan to the uniform wind speed is shortened, and the resistance loss caused by the fact that the high-speed airflow of the jet fan directly blows to a large obstacle is reduced.
Description
Technical Field
The invention belongs to the technical field of tunnel ventilation, and particularly relates to a tunnel jet fan flow guiding device and a flow guiding method.
Background
The jet fan has simple structure, flexible arrangement and simple control, and is widely applied to highway tunnel ventilation systems. In general, the highway tunnel is more abundant in height, and a certain setting interval is arranged between the fan and the tunnel roof, so that the friction between the high-speed air flow of the jet fan and the tunnel wall surface can be effectively controlled.
Under the conditions of urban tunnels, underwater tunnels and the like, due to the restrictions of project engineering cost and route selection, the tunnel clearance height is limited, the distance between a jet fan and a tunnel roof is small, high-speed air flow is blown out along a straight line and is in conical diffusion, and the additional resistance between the high-speed air flow and the tunnel wall surface is greatly increased, so that the operation cost of the tunnel is increased; in addition, the jet fan forms uniform air flow in the main hole, and the auxiliary pressurizing effect is weakened.
Therefore, how to reduce the energy consumption of the jet fan by adopting a simpler method under the condition of limited tunnel height, and improve the overall effect of the system becomes a urgent need to be solved for improving the economical efficiency of tunnel operation.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a tunnel jet fan flow guiding device and a flow guiding method, which can effectively solve the problems.
The technical scheme adopted by the invention is as follows:
the invention provides a tunnel jet fan flow guiding device, comprising: a guiding device shell (9), a guiding device rotating shaft (11) and guiding device guiding vanes (6);
the jet fan (4) is hung below the tunnel roof (1) through a jet fan hanging bracket (2); the shell (9) of the flow guiding device is horizontally arranged, one end of the shell is an air inlet, and the other end of the shell is an air outlet; an air inlet of the guide device shell (9) is fixedly connected with a jet flow fan outlet (5) of the jet flow fan (4), and air flow discharged by the jet flow fan (4) is guided into the guide device;
a plurality of deflector rotating shafts (11) are rotatably arranged at the inner center position of the deflector shell (9) from top to bottom; each guide device rotating shaft (11) is fixedly provided with one guide device guide blade (6), so that the guide device guide blade (6) is positioned between an air inlet of the guide device shell (9) and an air outlet of the guide device shell (9); when the guide device rotating shaft (11) rotates, the guide device guide vane (6) is driven to rotate, so that the inclination angle of the guide device guide vane (6) is adjusted; the guide vanes (6) of the guide device are arranged in a downward inclined mode; the airflow discharged from the jet fan outlet (5) of the jet fan (4) flows downwards along the guide vane (6) of the guide device in an inclined way and finally flows out of the shell (9) of the guide device, so that the angle of the airflow at the outlet of the jet fan (4) is adjusted, the friction between the jet fan and the wall surface of a tunnel is reduced, and the efficiency of the jet fan is improved.
Preferably, the diversion device rotating shaft (11) is a bolt.
Preferably, the air inlet of the guide device shell (9) is fixedly connected with the jet fan outlet (5) of the jet fan (4) through bolts or welding.
The invention also provides a diversion method based on the diversion device of the tunnel jet fan, which comprises the following steps:
step 1, installing a flow guiding device (10) at a jet fan outlet (5) of a jet fan (4) hung below a tunnel roof (1); according to the distance between the jet fan (4) and the tunnel roof (1), basic parameters of the flow guiding device (10) are determined, and the method comprises the following steps: the length of the guide vane (6) of the guide device, the inclination angle of the guide vane (6) of the guide device and the length of the shell (9) of the guide device;
and 2, enabling airflow discharged from a jet fan outlet (5) of the jet fan (4) to flow downwards along the guide vane (6) of the guide device in an inclined way and finally flow out of a shell (9) of the guide device, thereby adjusting the airflow angle of the outlet of the jet fan (4), reducing the friction between the jet fan and the wall surface of a tunnel, and improving the efficiency of the jet fan.
Preferably, the following factors are also taken into account when determining the basic parameters of the deflector (10): whether an obstacle exists in front of the jet fan, the horizontal distance between the obstacle and the jet fan and the height of the obstacle.
Preferably, if an obstacle exists in front of the jet fan, the direction of the air flow at the outlet of the jet fan is changed by adjusting the inclination angle of the guide vane (6) of the guide device, so that the distance that the high-speed air flow of the jet fan forms the main hole with uniform air speed is shortened, and the resistance loss caused by the fact that the high-speed air flow of the jet fan directly blows to the obstacle is reduced.
The flow guiding device and the flow guiding method of the tunnel jet fan provided by the invention have the following advantages:
(1) Under the condition that the height of the tunnel building is not changed, the efficiency of the jet fan can be effectively improved by arranging the flow guiding device at the outlet end of the jet fan, and the method has good application prospect for tunnels with limited tunnel building heights;
(2) The device can also be applied to the situation that a large barrier in front of the jet fan cannot avoid, so that the ventilation air flow of the tunnel is improved. The distance that the high-speed airflow of the jet fan forms the uniform wind speed of the main hole is shortened by changing the airflow direction of the outlet of the jet fan, so that the resistance loss caused by the fact that the high-speed airflow of the jet fan directly blows to a large obstacle is reduced;
(3) The tunnel jet flow fan flow guiding device provided by the invention can be used for manufacturing flow guiding devices with different specifications according to different specifications of fans. According to factors such as distance between jet fan and the tunnel wall and road surface gradient, adjust guiding vane angle to guiding device, reach the purpose that reduces pressure loss, raise the efficiency, guiding vane angle of adjustment is according to the actual conditions of tunnel, but angle of adjustment is generally within 10.
(4) The invention can realize engineering standardization and integrated production, improves the product quality and simplifies the construction flow.
(5) The invention has simple structure, convenient installation and small maintenance amount in the later period.
Drawings
FIG. 1 is a schematic diagram of the installation of a jet fan deflector in a tunnel;
FIG. 2 is a cross-sectional view of a jet fan deflector provided by the present invention;
FIG. 3 is a schematic diagram of the change in air flow caused by too close a distance between the air flow of the jet fan and a large obstacle when the jet fan deflector is not installed;
FIG. 4 is a schematic diagram of the change in air flow caused by the flow of jet fan through a large obstruction when the jet fan deflector has been installed;
FIG. 5 is a schematic diagram of a front view structure of a jet fan flow guiding device provided by the invention;
FIG. 6 is a longitudinal airflow diffusion cloud of a jet fan;
FIG. 7 is a schematic view of a structure illustrated in a jet fan position friction loss coefficient table;
wherein: the device comprises a 1-tunnel top plate, a 2-jet fan hanging bracket, a 3-jet fan inlet airflow direction, a 4-jet fan, a 5-jet fan outlet, a 6-guide device guide vane, a 7-jet fan outlet airflow direction, an 8-airflow change angle, a 9-guide device shell, a 10-guide device, a 11-guide device rotating shaft and a 12-tunnel inner large obstacle.
Detailed Description
In order to make the technical problems, technical schemes and beneficial effects solved by the invention more clear, the invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The invention provides a diversion device and a diversion method of a tunnel jet fan, which mainly comprises the following steps: the flow guiding device is arranged at the position of the outlet of the jet flow fan of the tunnel, so that the flow guiding device is connected with the outlet of the jet flow fan to form a whole, the air flow direction of the jet flow fan can be adjusted by adjusting the angle of the flow guiding blade of the flow guiding device, the friction between the air flow of the jet flow fan and the wall surface of the tunnel is reduced, and the efficiency of the jet flow fan is improved. Therefore, the invention effectively solves the problem that the height of the tunnel building is limited and the efficiency of the jet fan is affected.
Specifically, it is found that the efficiency of the jet fan is influenced by the distance between the jet fan and the tunnel wall surface in addition to the characteristic influence of the jet fan. The friction loss coefficient of the jet fan position is shown in the following table:
single jet fan position friction loss reduction coefficient eta
Note that: d in Table j The inner diameter of the jet fan is shown, and Z is the distance between the center of the jet fan and the wall surface of the tunnel.
From the above table, it can be found that the closer the jet fan is to the wall surface of the tunnel, the larger the friction loss is, thereby leading to the drop of the rising pressure of the jet fan. Under the condition of a certain tunnel clearance height, friction loss of the jet fan can be effectively reduced by changing the outlet direction of the jet fan. According to the result of numerical simulation, the boosting efficiency can be improved by about 40%.
Based on the above, the inventor designs and researches a diversion device of a tunnel jet fan, which can improve the overall efficiency of the jet fan under the condition of limited building height. Referring to fig. 1, 2 and 5, the tunnel jet fan deflector includes: a deflector housing 9, a deflector rotating shaft 11 and deflector guide vanes 6;
the jet fan 4 is hung below the tunnel roof 1 through a jet fan hanging bracket 2; the diversion device shell 9 is horizontally arranged, one end of the diversion device shell is an air inlet, and the other end is an air outlet; an air inlet of the guide device shell 9 is fixedly connected with a jet fan outlet 5 of the jet fan 4, and air flow discharged by the jet fan 4 is guided into the guide device; the air inlet of the guide device shell 9 is fixedly connected with the jet fan outlet 5 of the jet fan 4 through bolts or welding and the like.
A plurality of deflector rotating shafts 11 are rotatably arranged at the inner center position of the deflector shell 9 from top to bottom, and the deflector rotating shafts 11 can be bolts; a guide vane 6 of the guide device is fixedly arranged on each guide device rotating shaft 11, so that the guide vane 6 of the guide device is positioned between an air inlet of the guide device shell 9 and an air outlet of the guide device shell 9; when the guide device rotating shaft 11 rotates, the guide device guide vane 6 is driven to rotate, so that the inclination angle of the guide device guide vane 6 is adjusted; the guide vanes 6 of the guide device are arranged obliquely downwards; the airflow discharged from the jet fan outlet 5 of the jet fan 4 flows downwards obliquely along the guide vane 6 of the guide device and finally flows out of the shell 9 of the guide device, so that the angle of the airflow at the jet fan 4 outlet is adjusted, the friction between the jet fan and the wall surface of the tunnel is reduced, and the efficiency of the jet fan is improved.
The inventor carries out a great deal of research experiments, and discovers that the following relationship exists between the inclination angle alpha of the guide vane of the guide device and the rising pressure of the jet fan:
wherein: ΔP is the jet fan boost pressure, ρ is the air density, V j For the outlet wind speed of the jet fan, V r For tunnel longitudinal wind speed, A J Is the cross-sectional area of the jet fan, A r For the tunnel clearance area, eta' is an additional resistance coefficient, and is related to the height of the fan from the tunnel wall surface and the airflow direction of the jet fan, and the specific numerical value needs to be according to the actual situationVerification or numerical simulation makes verification determinations.
Therefore, as the distance between the jet fan and the side wall of the tunnel has great influence on the pressure loss of the jet fan, under the condition that the clearance height of the tunnel is limited, the additional pressure loss of the jet fan caused by too low installation height can be reduced through the flow guiding device, and the pressurization efficiency of the fan is improved.
The flow guiding device can also be applied to the situation that the additional pressure loss is overlarge because the distance between the outlet of the jet fan and the large obstacle is too small and the high-speed airflow directly impacts the large obstacle. The device can shorten the mixing distance of high-speed air flow and main hole air flow, and reduce the air flow speed of impacting large obstacles in an effective longitudinal distance, thereby reducing pressure loss. The device simple structure, it is convenient to adjust, and the maintenance volume is little, can carry out supporting use with different fan models, in tunnels such as city tunnel, tunnel headroom height limited under water tunnel to and the unable tunnel of effectively dodging of large-scale barrier and fan longitudinal distance, the device promotes the effect obvious to jet fan efficiency.
The invention also provides a diversion method based on the diversion device of the tunnel jet fan, which comprises the following steps:
step 1, installing a flow guiding device 10 at a jet fan outlet 5 of a jet fan 4 suspended below a tunnel roof 1; according to the distance between the jet fan 4 and the tunnel roof 1, basic parameters of the diversion device 10 are determined, including: the length of the guide vane 6 of the guide device, the inclination angle of the guide vane 6 of the guide device and the length of the shell 9 of the guide device;
and 2, the air flow discharged from the jet flow fan outlet 5 of the jet flow fan 4 flows downwards obliquely along the guide vane 6 of the guide device and finally flows out of the shell 9 of the guide device, so that the air flow angle of the jet flow fan 4 outlet is adjusted, the friction between the jet flow fan and the tunnel wall surface is reduced, and the efficiency of the jet flow fan is improved.
In addition, the following factors are also considered in determining the basic parameters of the deflector 10: whether an obstacle exists in front of the jet fan, the horizontal distance between the obstacle and the jet fan and the height of the obstacle.
Specifically, in the case of a sufficient tunnel installation height, the distance required for the jet fan high-speed airflow to form a uniform wind speed in the main hole is generally about 100m, as shown in fig. 6. Because the tunnel is also provided with a variable information plate, a lane indication mark, a smoke exhaust channel and other large obstacles, the distance from the outlet of the jet fan is about 30m in many cases, and the boosting effect of the jet fan is reduced in the case, as shown in fig. 3. By installing the deflector at the jet fan outlet, the distance required for mixing the high-speed air flow with the main hole air flow can be shortened, and the additional resistance caused by blocking of the barrier can be reduced, as shown in fig. 4.
Therefore, when an obstacle exists in front of the jet fan, the inclination angle of the guide vane of the guide device is adjusted, so that the air flow direction of the outlet of the jet fan is changed, the distance that the high-speed air flow of the jet fan forms the uniform air speed of the main hole is shortened, and the resistance loss caused by the fact that the high-speed air flow of the jet fan directly blows to the obstacle is reduced.
The device has simple structure and convenient installation, can be matched with jet fans of any model for use, and improves the outlet airflow condition of the jet fans. The device can be matched with a jet fan in a factory, and can also be used for reforming the jet fan of an established tunnel.
The flow guiding device and the flow guiding method of the tunnel jet fan provided by the invention have the following advantages:
(1) Under the condition that the height of the tunnel building is not changed, the efficiency of the jet fan can be effectively improved by arranging the flow guiding device at the outlet end of the jet fan, and the method has good application prospect for tunnels with limited tunnel building heights;
(2) The device can also be applied to the situation that a large barrier in front of the jet fan cannot avoid, so that the ventilation air flow of the tunnel is improved. The distance that the high-speed airflow of the jet fan forms the uniform wind speed of the main hole is shortened by changing the airflow direction of the outlet of the jet fan, so that the resistance loss caused by the fact that the high-speed airflow of the jet fan directly blows to a large obstacle is reduced;
(3) The tunnel jet flow fan flow guiding device provided by the invention can be used for manufacturing flow guiding devices with different specifications according to different specifications of fans. According to factors such as distance between jet fan and the tunnel wall and road surface gradient, adjust guiding vane angle to guiding device, reach the purpose that reduces pressure loss, raise the efficiency, guiding vane angle of adjustment is according to the actual conditions of tunnel, but angle of adjustment is generally within 10.
(4) The invention can realize engineering standardization and integrated production, improves the product quality and simplifies the construction flow.
(5) The invention has simple structure, convenient installation and small maintenance amount in the later period.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which is also intended to be covered by the present invention.
Claims (5)
1. The utility model provides a diversion method of tunnel jet fan guiding device which characterized in that, tunnel jet fan guiding device includes: a guiding device shell (9), a guiding device rotating shaft (11) and guiding device guiding vanes (6);
the jet fan (4) is hung below the tunnel roof (1) through a jet fan hanging bracket (2); the shell (9) of the flow guiding device is horizontally arranged, one end of the shell is an air inlet, and the other end of the shell is an air outlet; an air inlet of the guide device shell (9) is fixedly connected with a jet flow fan outlet (5) of the jet flow fan (4), and air flow discharged by the jet flow fan (4) is guided into the guide device;
a plurality of deflector rotating shafts (11) are rotatably arranged at the inner center position of the deflector shell (9) from top to bottom; each guide device rotating shaft (11) is fixedly provided with one guide device guide blade (6), so that the guide device guide blade (6) is positioned between an air inlet of the guide device shell (9) and an air outlet of the guide device shell (9); when the guide device rotating shaft (11) rotates, the guide device guide vane (6) is driven to rotate, so that the inclination angle of the guide device guide vane (6) is adjusted; the guide vanes (6) of the guide device are arranged in a downward inclined mode; the air flow discharged from the jet flow fan outlet (5) of the jet flow fan (4) flows downwards obliquely along the guide vane (6) of the guide device and finally flows out of the shell (9) of the guide device, so that the air flow angle of the jet flow fan (4) outlet is adjusted, the friction between the jet flow fan and the wall surface of a tunnel is reduced, and the efficiency of the jet flow fan is improved;
the diversion method of the diversion device of the tunnel jet fan comprises the following steps:
step 1, installing a flow guiding device (10) at a jet fan outlet (5) of a jet fan (4) hung below a tunnel roof (1); according to the distance between the jet fan (4) and the tunnel roof (1), basic parameters of the flow guiding device (10) are determined, and the method comprises the following steps: the length of the guide vane (6) of the guide device, the inclination angle of the guide vane (6) of the guide device and the length of the shell (9) of the guide device;
and 2, enabling airflow discharged from a jet fan outlet (5) of the jet fan (4) to flow downwards along the guide vane (6) of the guide device in an inclined way and finally flow out of a shell (9) of the guide device, thereby adjusting the airflow angle of the outlet of the jet fan (4), reducing the friction between the jet fan and the wall surface of a tunnel, and improving the efficiency of the jet fan.
2. The method of diversion of a tunnel jet fan diversion device according to claim 1, characterized in that the following factors are also considered when determining the basic parameters of the diversion device (10): whether an obstacle exists in front of the jet fan, the horizontal distance between the obstacle and the jet fan and the height of the obstacle.
3. The diversion method of the diversion device of the tunnel jet fan according to claim 2, wherein if an obstacle exists in front of the jet fan, the direction of the air flow at the outlet of the jet fan is changed by adjusting the inclination angle of the diversion blade (6) of the diversion device, the distance that the high-speed air flow of the jet fan forms the uniform air speed of the main hole is shortened, and the resistance loss caused by the direct blowing of the high-speed air flow of the jet fan to the obstacle is reduced.
4. The method for guiding a tunnel jet fan guiding device according to claim 1, characterized in that the guiding device rotating shaft (11) is a bolt.
5. The diversion method of the diversion device of the tunnel jet fan according to claim 1, wherein an air inlet of the diversion device shell (9) is fixedly connected with a jet fan outlet (5) of the jet fan (4) through bolts or welding.
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| CN201711020321.8A CN107605525B (en) | 2017-10-27 | 2017-10-27 | Flow guiding device and flow guiding method for tunnel jet fan |
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| CN108868859A (en) * | 2018-06-20 | 2018-11-23 | 中钢集团马鞍山矿山研究院有限公司 | A kind of mine skip shaft outgoing airflow shuts off partitioning system |
| CN110953174A (en) * | 2019-12-11 | 2020-04-03 | 深圳市创智联环保设备有限公司 | Jet fan capable of automatically steering |
| CN113207700B (en) * | 2021-04-26 | 2022-09-02 | 青岛科创信达科技有限公司 | Asymmetric stepped air supply system suitable for building cultivation and improvement method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| AT228259B (en) * | 1961-08-21 | 1963-07-10 | Ludwig Dipl Ing Hoffmann | Ventilation system for tunnels, galleries or shafts |
| JP3446255B2 (en) * | 1992-08-26 | 2003-09-16 | 三菱電機株式会社 | Air conditioner wind direction adjustment device |
| CN101315082A (en) * | 2007-05-30 | 2008-12-03 | 星普科技股份有限公司 | Fan using static blade and movable blade to change pressure |
| CN201420697Y (en) * | 2009-04-30 | 2010-03-10 | 陈祖能 | Mining building block-type axial-flow fan |
| CN102086773A (en) * | 2010-12-29 | 2011-06-08 | 上海纳米技术及应用国家工程研究中心有限公司 | Purification and ventilation device of air in tunnel |
| CN202926673U (en) * | 2012-11-08 | 2013-05-08 | 浙江金盾风机股份有限公司 | Jet fan with adjustable wind guide louvers |
| CN204126915U (en) * | 2014-09-14 | 2015-01-28 | 湖北省风机厂有限公司 | A kind of high thrust reversible tunnel jet blower |
| CN206409413U (en) * | 2017-01-22 | 2017-08-15 | 唐芬才 | A kind of safety of coal mines high effective ventilator |
| CN207348889U (en) * | 2017-10-27 | 2018-05-11 | 北京交科公路勘察设计研究院有限公司 | Tunnel jet blower guiding device |
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