CN111288003A

CN111288003A - Utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial compressor of perpendicular installation

Info

Publication number: CN111288003A
Application number: CN202010272172.XA
Authority: CN
Inventors: 崔兴华; 闵云; 杜菲; 石小兵
Original assignee: Shanghai Jinxian Electromechanical Technology Co ltd
Current assignee: Shanghai Jinxian Electromechanical Technology Co ltd
Priority date: 2020-04-09
Filing date: 2020-04-09
Publication date: 2020-06-16

Abstract

The invention discloses a vertically-installed large-scale axial-flow explosion-proof smoke exhaust fan structure for a comprehensive pipe gallery, which comprises a pipe gallery and an air cylinder, wherein an air port is formed in the upper side wall inside the pipe gallery, a plurality of cylinder seats are arranged on the outer side wall of the air cylinder, the cylinder seats are fixedly installed on the upper side wall inside the pipe gallery through spring vibration reduction mechanisms, the spring vibration reduction mechanisms are uniformly distributed on the peripheral side of the air port, the vertical central line of the air cylinder is vertical to the horizontal central line of the pipe gallery, a supporting mechanism is arranged on the inner side wall of the air cylinder, which is close to the air port, an axial-flow fan is fixedly installed on the supporting mechanism, the axial-flow fan is an explosion-proof motor, a hub is fixedly installed at the output shaft end of the axial-flow fan through a coupler, and a plurality of blades are uniformly arranged on the peripheral side wall of the hub, so that, the motor is ensured to be used in the environment with high wind pressure, large wind volume and overhigh temperature.

Description

Utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial compressor of perpendicular installation

Technical Field

The invention relates to the technical field of smoke exhaust fans, in particular to a vertically-installed large-scale axial-flow explosion-proof smoke exhaust fan structure for a comprehensive pipe gallery.

Background

The building main body of the comprehensive pipe gallery is a large-pipe-diameter tunnel, and the ventilation working condition of the comprehensive pipe gallery is divided into a heat working condition, an accident working condition and an inspection working condition. For a comprehensive pipe gallery with cables, a heat supply pipe network and a gas pipeline, a main channel in a tunnel usually has larger heat productivity and needs ventilation and cooling; the accident condition comprises a dangerous gas leakage condition and a fire hazard condition: when leakage working condition occurs, SF is in the pipe gallery₆The gas or the gas can harm equipment and human bodies in the pipe gallery, gas explosion is easy to generate, explosion-proof exhaust of the pipe gallery is required to be rapidly carried out, and fire smoke in the pipe gallery is required to be exhausted out of the pipe gallery under the working condition of fire; air quality needs to satisfy personnel's safety requirement when patrolling personnel and getting into the tunnel at ordinary times, consequently, utility tunnel's ventilation design needs to satisfy equipment operation safety and operation personnel safety.

According to the ventilation operating mode's of utility tunnel demand, need dispose the fan of a large amount of different functions, these fans include the heat dissipation fan of airing exhaust of normal atmospheric temperature operating mode, the exhaust fan and the explosion-proof fan under the urgent operating mode, just can ensure that the ventilation system in the piping lane satisfies equipment operation safety and operation personnel safety. According to utility tunnel's civil engineering structure, ventilation system's all fans need install perpendicularly in the top of piping lane, if combine all fan performance together, realize by the large-scale axial fan of a big amount of wind, high wind pressure, will reduce equipment investment and civil engineering installation cost by a wide margin, will improve the operating efficiency of fan moreover, realize the energy-conserving operation of ventilation system.

The existing large axial flow fans with high wind pressure and large wind volume have a lot of products, but the existing large axial flow fans cannot simultaneously have high-temperature smoke exhaust and explosion prevention functions, and the stability is poor in the vertical installation process.

Disclosure of Invention

The invention aims to provide a vertically-installed large axial-flow explosion-proof smoke exhaust fan structure for a comprehensive pipe gallery, and aims to solve the problems that the large axial-flow fan cannot simultaneously have high-temperature smoke exhaust and explosion-proof functions and is poor in stability in the vertical installation process in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a vertical installation large-scale axial flow explosion-proof smoke exhaust fan structure for utility tunnel, including piping lane and dryer, the inside lateral wall of piping lane is equipped with the wind gap, the lateral wall of dryer is equipped with a plurality of tube socket, the tube socket all is through spring damping mechanism fixed mounting at the inside lateral wall of piping lane, a plurality of spring damping mechanism is even distributes in week side in the wind gap, the vertical central line of dryer is perpendicular with the horizontal central line of piping lane, the position that the inside wall of dryer is close to the wind gap is equipped with supporting mechanism, fixed mounting has axial flow fan on the supporting mechanism, axial flow fan is flame proof type motor, axial flow fan's output shaft end has wheel hub through shaft coupling fixed mounting, the week lateral wall of wheel hub is even is equipped with a plurality of blade, the blade passes through bolt fixed mounting on wheel hub, the blade activity is in the dryer, the lateral wall of dryer is equipped with the terminal, the junction box is electrically connected with the axial flow fan, and the outer side wall of the axial flow fan is covered with an anti-corrosion fire-resistant layer.

Preferably, the spring damping mechanism comprises a spring damper, one end of the spring damper is fixed on the upper side wall of the inner part of the pipe gallery through a plurality of expansion bolts, and the other end of the spring damper is fixed on the barrel seat through a fastening bolt.

Preferably, the support mechanism comprises a base, one end of each of a plurality of support arms is fixedly mounted on the side wall of the base, the other end of each support arm is fixedly mounted on the inner side wall of the air duct, and the axial flow fan is fixedly mounted on the base.

Preferably, a foundation steel base plate is arranged between the spring damper and the pipe gallery, and the expansion bolts penetrate through the foundation steel base plate.

Preferably, an adjusting nut is in threaded connection with the fastening bolt and is positioned between the spring damper and the barrel seat.

Preferably, the anti-corrosion fire-resistant layer is made of epoxy resin materials.

Preferably, the thickness of the anti-corrosion refractory layer is more than 75 μm.

Preferably, a protective cover is fixedly mounted on one surface of the hub, which is far away from the axial flow fan.

Compared with the prior art, the invention has the beneficial effects that: the invention relates to a vertically-installed large-scale axial-flow explosion-proof smoke exhaust fan structure for a comprehensive pipe gallery, which is characterized in that blades can rotate in an air duct through the matching arrangement of an axial-flow fan, a coupler and a hub, the vibration of the air duct caused by the impact of high air pressure and large air volume can be attenuated through the matching arrangement of a spring damper, an expansion bolt, a fastening bolt, a base steel backing plate and an adjusting nut, the loose connection of components in the air duct is prevented, the support effect on the axial-flow fan is realized through the matching arrangement of a base and a plurality of support arms, the connection with an external power supply can be realized through a junction box, an anticorrosion fire-resistant layer made of an epoxy resin material is adopted, the shell of the axial-flow fan is subjected to hot galvanizing treatment in the manufacturing process, the damage of the axial-flow fan caused by external high temperature can be prevented, the invention can prevent the, the axial flow machine is ensured to be used in the environment with high wind pressure, large wind volume and overhigh temperature.

Drawings

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;

FIG. 3 is an enlarged view of the structure at B in FIG. 1;

FIG. 4 is a schematic structural view of the support mechanism of the present invention disposed in the air duct;

fig. 5 is a schematic bottom view of the present invention.

In the figure: the device comprises a pipe gallery 1, a wind barrel 2, a wind port 3, a barrel seat 4, a spring damping mechanism 5, a spring damper 501, an expansion bolt 502, a fastening bolt 503, a foundation steel backing plate 504, an adjusting nut 505, a support mechanism 6, a base 601, a support arm 602, an axial flow fan 7, a shaft coupling 8, a hub 9, a blade 10, a junction box 11 and a protective cover 12.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides a technical solution: a vertically-installed large-sized axial-flow explosion-proof smoke exhaust fan structure for a comprehensive pipe gallery comprises a pipe gallery 1 and an air duct 2, wherein an air port 3 is formed in the upper side wall inside the pipe gallery 1, the air duct 2 needs to completely cover an axial-flow fan 7 and blades 10, the air duct 2 is processed by hot galvanizing, a spinning flange is formed, the thickness of the plate is not smaller than 6mm, an aluminum ring is fixedly installed on the inner side wall of the air duct 2 corresponding to the blades 10 through rivets, the fixing rivets are made of aluminum materials, the tip portion of each blade 10 is guaranteed to be in steel-aluminum contact with the corresponding aluminum ring, no spark is generated, the air duct 2 is made of low-carbon steel materials, the air duct 2 is made of an integral rolling process, the air duct 2 is only provided with one welding line and is connected in a butt welding connection mode, a plurality of drum bases 4 are arranged on the outer side wall of the air duct 2, the drum bases 4 are fixedly installed on the upper side, the vertical central line of the air duct 2 is vertical to the horizontal central line of the pipe gallery 1, a supporting mechanism 6 is arranged at the position, close to the air port 3, of the inner side wall of the air duct 2, an axial flow fan 7 is fixedly installed on the supporting mechanism 6, the axial flow fan 7 is an explosion-proof motor, a hub 9 is fixedly installed at the output shaft end of the axial flow fan 7 through a coupler 8, a plurality of blades 10 are uniformly arranged on the peripheral side wall of the hub 9, the blades 10 are fixedly installed on the hub 9 through bolts, the blades 10 are movably arranged in the air duct 2, the blades 10, the hub 9 and the coupler 8 can be made of stainless steel materials, the blade intervals are uniform, and the angle is determined according to; before the fan is integrally installed, 100% X-ray detection can be performed on the used blades and the hub to prevent cracks inside the fan, the outer side wall of the air duct 2 is provided with a junction box 11, the junction box 11 is electrically connected with the axial flow fan 7, and the junction box marks and the rotor rotating direction meet the IEC standard. The outer side wall of the axial flow fan 7 is covered with an anti-corrosion fire-resistant layer, the axial flow fan 7 is subjected to complete machine dynamic balance check after being assembled, dynamic balance vibration frequency spectrum analysis is carried out, the rated frequency of the axial flow fan 7 is selected to be 50Hz, -5% -3% (except for the case of adopting variable frequency starting), the rated voltage is selected to be 380V +/-7% or 220V +/-7%, the rated power of the axial flow fan is required to be at least 1.15 times of the axial power of the fan, the axial flow fan 7 is an explosion-proof motor, and electrical equipment is required to meet the explosion-proof regulation of the existing national standard' explosion hazard environment electric device design specification GB50058 related to the 2 areas of the explosive gas environment.

The insulation grade of the axial flow fan 7 is in accordance with the H grade; insulating materials suitable for tropical climate are adopted. The technical specification of the insulating material must comply with the IEC-85 standard.

The axial flow fan 7 is of a closed type, and the protection type is IP55 and Exd11BT 4.

Specifically, spring damper mechanism 5 includes spring damper 501, and the one end of spring damper 501 is fixed on the inside upper wall of piping lane 1 through a plurality of expansion bolts 502, and the other end of spring damper 501 is fixed on barrel holder 4 through holding bolt 503, and through the cooperation setting of spring damper 501, expansion bolts 502, holding bolt 503, basis steel backing plate 504 and adjusting nut 505, the vibration that can attenuate dryer 2 and produce because of the impact of high wind pressure and big amount of wind, prevent that the inside part of dryer 2 from connecting not hard up.

Specifically, the support mechanism 6 includes a base 601, one end of a plurality of support arms 602 is fixedly mounted on a side wall of the base 601, the other end of the support arms 602 is fixedly mounted on an inner side wall of the air duct 2, and the axial flow fan 7 is fixedly mounted on the base 601 and plays a supporting role for the axial flow fan 7.

Specifically, a foundation steel plate 504 is arranged between the spring damper 501 and the pipe gallery 1, and the expansion bolts 502 penetrate through the foundation steel plate 504 to enhance the stability of the spring damper 501.

Specifically, an adjusting nut 505 is screwed to the fastening bolt 503 between the spring damper 501 and the cylinder base 4, and the damping force of the spring damper 501 can be adjusted by the adjusting nut 505.

Specifically, the anti-corrosion fire-resistant layer is made of epoxy resin materials which are non-toxic and have the characteristics of corrosion resistance, fire resistance and the like.

Specifically, the thickness of the anti-corrosion fireproof layer is larger than 75 μm, and the influence of high temperature on the axial flow fan 7 is effectively blocked.

Specifically, a shield 12 is fixedly mounted on the hub 9 on a surface thereof remote from the axial flow fan 7.

The working principle is as follows: in the invention, through the matching arrangement of the axial flow fan 7, the coupling 8 and the hub 9, the blade 10 can rotate in the wind cylinder 2, through the matching arrangement of the spring vibration absorber 501, the expansion bolt 502, the fastening bolt 503, the base steel backing plate 504 and the adjusting nut 505, the vibration of the wind cylinder 2 caused by the impact of high wind pressure and large wind volume can be attenuated, the loose connection of the components in the wind cylinder 2 can be prevented, through the matching arrangement of the base 601 and the plurality of supporting arms 602, the supporting function is realized for the axial flow fan 7, the connection with an external power supply can be realized through the junction box 11, the corrosion-resistant fire-resistant layer made of epoxy resin material is adopted, and the hot galvanizing treatment is carried out on the shell of the axial flow fan 7 in the manufacturing process, the damage of the axial flow fan 7 caused by external high temperature can be prevented, the abnormal phenomena of violent vibration, impact, rapid rise of shaft temperature and the, the axial flow fan 7 is ensured to be used in the environment with high wind pressure, large wind volume and overhigh temperature.

Before the axial flow fan 7 is started, the axial flow fan 7 and auxiliary equipment thereof are checked to determine whether the use condition of the axial flow fan is met or not, whether the installed axial flow fan 7 is naturally matched with a basic joint surface or not is checked, and no external weight is applied to each part of the axial flow fan 7.

And (4) checking whether sundries, chips and the like exist in the installed axial flow fan 7, or else, cleaning up the axial flow fan to ensure the safe operation of the axial flow fan.

And checking whether the mounted power supply wire of the axial flow fan is correctly connected to the junction box 11 of the axial flow fan 7 or not, and sealing.

The clearance between the blade 10 and the duct 2 and the presence or absence of collision and friction between other rotating parts and fixed parts are checked.

If the axial flow fan is not operated for a long period of time, the insulation resistance of the axial flow fan 7 is measured using a 500 volt megohm meter before the start-up, and the value thereof should not be lower than 0.5 megohm. Otherwise, the stator winding of the axial flow fan 7 should be dried, and the temperature of the drying process is not allowed to exceed 120 ℃.

And (4) checking whether circuit lines and instruments in an electric control system of the axial flow fan 7 are correct and intact. And whether the axial flow fan 7 controlled by the soft starter is connected with a circuit line and started according to the specification of the operation specification of the soft starter.

After the above inspection is finished, the trial operation of the axial flow fan 7 is carried out, whether the airflow direction of the axial flow fan 7 and the rotation direction of the blades 10 are consistent with the arrow marks on the nameplate of the axial flow fan 7 or not is checked, otherwise, the positions of two phase power lines entering the axial flow fan 7 need to be exchanged randomly, and then the machine is retested.

In the normal operation process of the axial flow fan 7, if the axial flow fan 7 is found to have abnormal phenomena such as violent vibration, impact, rapid rise of bearing temperature, overlarge current and the like, the machine is immediately stopped for inspection and is eliminated.

Setting the braking time (from 50 to 0Hz, generally 25 to 30s) and the like.

Only the axial fan 7 and its auxiliary equipment can be put into operation under the complete normal condition.

During the startup, shutdown or operation of the axial flow fan 7, if abnormal phenomena are found, the detection should be immediately carried out, the reason should be found out by checking the found small faults, and the detection should be completely carried out by checking if the large faults are found.

In the operation process of the axial flow fan 7, the vibration of the axial flow fan 7 and whether the current, the voltage and the power of the axial flow fan 7 are normal should be checked frequently. If the axial flow fan 7 is found to have violent abnormal phenomena such as vibration, impact, rapid rise of shaft temperature, overlarge or small current and the like, the machine is immediately stopped to check whether each component normally operates or not, and the operation is allowed to be restarted after the components are eliminated.

In order to avoid affecting the balance accuracy of the blade 10, the impurities such as dust and dirt on the inner and outer surfaces of the blade 10 and the axial flow fan 7 should be regularly cleaned, so as to prevent the axial flow fan 7 from being rusted.

To ensure personal safety, maintenance of the axial fan 7 must be performed after a shutdown.

When the axial flow fan equipment is started after maintenance, attention should be paid to whether each part of the axial flow fan is normal.

In the description of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The standard parts used in the invention can be purchased from the market, the special-shaped parts can be customized according to the description of the specification and the accompanying drawings, the specific connection mode of each part adopts conventional means such as bolts, rivets, welding and the like mature in the prior art, the machines, the parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection mode in the prior art, so that the detailed description is omitted.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. Utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial compressor of perpendicular installation, including piping lane (1) and dryer (2), its characterized in that: the side wall is equipped with wind gap (3) on the inside of piping lane (1), the lateral wall of dryer (2) is equipped with a plurality of tube seat (4), tube seat (4) all pass through spring damping mechanism (5) fixed mounting and go up the lateral wall in the inside of piping lane (1), a plurality of spring damping mechanism (5) even distribution is in week side of wind gap (3), the vertical central line of dryer (2) is perpendicular with the horizontal central line of piping lane (1), the position that the inside wall of dryer (2) is close to wind gap (3) is equipped with supporting mechanism (6), fixed mounting has axial fan (7) on supporting mechanism (6), axial fan (7) are flame proof type motor, axial fan's (7) output axle head (9) fixed mounting has wheel hub (9) through shaft coupling (8), the week side wall of wheel hub (9) is even is equipped with a plurality of blade (10), the blade (10) is fixedly mounted on the hub (9) through a bolt, the blade (10) is movable in the air duct (2), the outer side wall of the air duct (2) is provided with a junction box (11), the junction box (11) is electrically connected with the axial flow fan (7), and the outer side wall of the axial flow fan (7) is covered with an anti-corrosion fire-resistant layer.

2. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: the spring vibration reduction mechanism (5) comprises a spring vibration reducer (501), one end of the spring vibration reducer (501) is fixed on the upper side wall of the interior of the pipe gallery (1) through a plurality of expansion bolts (502), and the other end of the spring vibration reducer (501) is fixed on the barrel seat (4) through a fastening bolt (503).

3. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: the supporting mechanism (6) comprises a base (601), one end of a plurality of supporting arms (602) is fixedly mounted on the side wall of the base (601), the other end of each supporting arm (602) is fixedly mounted on the inner side wall of the air duct (2), and the axial flow fan (7) is fixedly mounted on the base (601).

4. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: a foundation steel backing plate (504) is arranged between the spring damper (501) and the pipe gallery (1), and the expansion bolts (502) penetrate through the foundation steel backing plate (504).

5. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: and an adjusting nut (505) is connected on the fastening bolt (503) and positioned between the spring damper (501) and the cylinder seat (4) through threads.

6. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: the anti-corrosion fire-resistant layer is made of epoxy resin materials.

7. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: the thickness of the anti-corrosion fire-resistant layer is more than 75 μm.

8. The utility model discloses a utility tunnel is with explosion-proof smoke exhaust fan structure of large-scale axial flow of vertical installation, its characterized in that: and a protective cover (12) is fixedly arranged on one surface of the hub (9) far away from the axial flow fan (7).