A low-noise ventilation fan for a long tunnel of a highway

Abstract

The utility model provides a kind of low-noise ventilation fan of highway long tunnel, including air inlet cylinder, exhaust cylinder, fan cylinder and noise reduction flow guide cylinder;The air outlet end of air inlet cylinder and the air inlet end of exhaust cylinder are respectively communicated at the both ends of fan cylinder;Noise reduction flow guide cylinder is engagedly connected in air inlet cylinder and is located on the central axis of air inlet cylinder, and there is a flow guide passage between the inner peripheral wall of air inlet cylinder;Two clamping blocks are provided on the outer side wall of one end of noise reduction flow guide cylinder;A mounting bracket is provided on the inner side wall of the air outlet end of air inlet cylinder, two clamping interfaces corresponding with clamping block are opened on the mounting cylinder side wall of mounting bracket;Noise reduction flow guide cylinder is engagedly connected by clamping block and clamping interface;The other end of noise reduction flow guide cylinder is conically arranged and extends to the air inlet end of air inlet cylinder.The utility model not only can effectively carry out noise reduction and sound attenuation to the airflow entering air inlet cylinder, but also can guide the airflow entering fan cylinder, reduce the noise generated by airflow turbulence, improve noise reduction and sound attenuation effect.

Description

Technical Field

[0001] The utility model relates to the technical field of tunnel ventilation equipment, and particularly relates to a low-noise ventilation fan for long expressway tunnels. Background Art

[0002] In the modern transportation system, long expressway tunnels, with their excellent ability to penetrate mountains and deep valleys and connect traffic arteries, have become the "throat" for breaking through the constraints of complex terrain and maintaining the efficient operation of the road network. The supporting ventilation fans are like the "respiratory systems" of the tunnels. By continuously operating, they timely discharge toxic and harmful gases such as carbon monoxide and nitrogen oxides emitted by vehicles, quickly disperse the thick smoke caused by traffic accidents, and create a safe and comfortable driving environment for passing vehicles with a constant air cleanliness and good visibility conditions.

[0003] However, the existing ventilation fans generate high-decibel noises during operation. These high-decibel noises not only interfere with the normal communication of drivers and passengers in the tunnel, distract the driver's attention, and increase the potential risk of traffic accidents, but also seriously interfere with the life and rest of residents along the tunnel.

[0004] Therefore, there is an urgent need to provide a low-noise ventilation fan for long expressway tunnels to reduce the noise of the ventilation fan and thus reduce the interference to drivers and passengers and residents along the tunnel. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a low-noise ventilation fan for long expressway tunnels, effectively solving the technical problem that the existing ventilation fans for long expressway tunnels generate high-decibel noises during operation.

[0006] To solve the above technical problem, the utility model provides a low-noise ventilation fan for long expressway tunnels, which includes an air intake cylinder, an exhaust cylinder, a fan cylinder, and a noise reduction and flow guiding cylinder; the air outlet end of the air intake cylinder and the air inlet end of the exhaust cylinder are respectively connected to both ends of the fan cylinder; the noise reduction and flow guiding cylinder is snap-connected inside the air intake cylinder and located on the central axis of the air intake cylinder, and a flow guiding channel is formed between the noise reduction and flow guiding cylinder and the inner peripheral wall of the air intake cylinder; two clamping blocks are arranged on the outer side wall of one end of the noise reduction and flow guiding cylinder; an installation frame is arranged on the inner side wall of the air outlet end of the air intake cylinder, and two clamping interfaces corresponding to the clamping blocks are opened on the side wall of the installation cylinder of the installation frame; the noise reduction and flow guiding cylinder is snap-connected through the clamping blocks and the clamping interfaces; the other end of the noise reduction and flow guiding cylinder is tapered and extends to the air inlet end of the air intake cylinder.

[0007] Preferably, the installation frame includes an installation cylinder and four connecting rods equally spaced and connected to the outer peripheral wall of the installation cylinder; the central axis of the installation cylinder and the central axis of the air intake cylinder are on the same straight line, and the installation cylinder is fixed inside the air intake cylinder through the four connecting rods.

[0008] Preferably, the end of the mounting cylinder near the noise-reducing guide cylinder is open, and the end of the mounting cylinder away from the noise-reducing guide cylinder is closed; a spring is fixed inside the mounting cylinder; the diameter of the noise-reducing guide cylinder is smaller than the inner diameter of the mounting cylinder, and the end of the noise-reducing guide cylinder near the mounting cylinder has a compression groove adapted to the spring; when the noise-reducing guide cylinder is engaged with the snap-fit ​​interface through the snap-fit ​​block, the noise-reducing guide cylinder is inserted into the mounting cylinder, and the spring is compressed by the compression groove, so that the snap-fit ​​block is firmly engaged in the snap-fit ​​interface.

[0009] Preferably, it also includes a filter screen; the filter screen is sleeved outside the mounting cylinder and located between the snap-fit ​​interface and the connecting rod; when the snap-fit ​​block is snapped into the snap-fit ​​interface, the snap-fit ​​block can abut against the side of the filter screen.

[0010] Preferably, a sound-absorbing layer is provided on the outer peripheral wall of the noise reduction guide tube.

[0011] Preferably, a cavity for filling sound-absorbing cotton is formed inside the side wall of the air intake cylinder, and multiple air holes communicating with the cavity are opened on the inner side wall of the air intake cylinder; the multiple air holes are evenly distributed around the inner peripheral wall of the air intake cylinder.

[0012] Preferably, the fan casing includes a main casing, a base, a motor, and fan blades; a hoisting rod is provided on each side of the outer wall of the main casing; an electric telescopic rod is connected to each side of the upper surface of each hoisting rod; the base is fixed to the inner wall of the casing; the motor is mounted on the base; and the fan blades are connected to the output shaft of the motor.

[0013] Preferably, a first connecting flange is provided at each end of the lifting rod; two second connecting flanges corresponding to the first connecting flanges are provided on the outer wall of the air outlet end of the air inlet; and two third connecting flanges corresponding to the first connecting flanges are provided on the outer wall of the air inlet end of the exhaust pipe.

[0014] Preferably, the air intake end of the air intake cylinder is provided with a detachable protective cover.

[0015] Preferably, the wall thickness of the exhaust pipe decreases sequentially from the air inlet end to the air outlet end.

[0016] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0017] (1) The present invention provides a low-noise ventilation fan for long tunnels of highways, which can not only effectively reduce the noise of the airflow entering the air intake, but also guide the airflow entering the fan cylinder, reduce wind resistance, reduce the noise generated by airflow turbulence, and improve the noise reduction effect, thus effectively solving the technical problem of high noise of ventilation fans in long tunnels of highways during operation.

[0018] (2) The low-noise ventilation fan for long tunnels on highways provided by this utility model has an installation cylinder and a connecting rod. The central axis of the installation cylinder and the central axis of the air inlet cylinder are on the same straight line. This not only improves the installation stability of the mounting frame in the air inlet cylinder and provides reliable installation support for the noise reduction guide cylinder, but also makes the width of the guide channel between the noise reduction guide cylinder and the inner peripheral wall of the air inlet cylinder consistent, so that the airflow can pass through the guide channel evenly and stably, thereby effectively improving the noise reduction and guide effect.

[0019] (3) The present invention provides a low-noise ventilation fan for a long highway tunnel. Because the mounting cylinder is equipped with a spring and the noise reduction guide cylinder is provided with a compression groove, when the noise reduction guide cylinder is connected to the locking interface through the locking block, the noise reduction guide cylinder is inserted into the mounting cylinder and the spring is squeezed by the compression groove, so that the locking block is firmly locked in the locking interface. This not only enhances the stability of the connection between the noise reduction guide cylinder and the mounting frame, preventing the noise reduction guide cylinder from loosening or falling off during the operation of the low-noise ventilation fan in the long highway tunnel, but also buffers the vibration generated during the operation of the low-noise ventilation fan in the long highway tunnel, reducing the noise caused by vibration. At the same time, it facilitates the installation and disassembly of the noise reduction guide cylinder and improves the equipment maintenance efficiency.

[0020] (4) The low-noise ventilation fan for long highway tunnels provided by this utility model has a filter screen, which can filter the air entering the air intake, intercept dust, debris and other particles in the air, ensure that the air entering the fan casing is clean, and extend the service life of the low-noise ventilation fan for long highway tunnels. At the same time, when the snap-fit ​​block is engaged in the snap-fit ​​interface, the snap-fit ​​block is used to limit and fix the filter screen, which not only prevents the filter screen from sliding or falling off when it is impacted by airflow, but also allows the filter screen to be removed after the noise reduction guide tube is disassembled, making it convenient for cleaning or replacement of the filter screen.

[0021] (5) The present invention provides a low-noise ventilation fan for a long tunnel on a highway. Since the air inlet is provided with a cavity and the cavity is filled with sound-absorbing cotton, and the inner side wall of the air inlet is provided with multiple air holes, the sound-absorbing cotton can not only absorb the noise generated by the airflow through the air inlet and reduce the noise intensity, but also allow the noise to fully enter the cavity and contact the sound-absorbing cotton through the evenly distributed air holes, thereby improving the noise reduction effect.

[0022] (6) The low-noise ventilation fan for long highway tunnels provided by this utility model has a protective cover on the air inlet end of the air inlet cylinder that can be detachably set (such as plug-in, snap-fit ​​connection, threaded connection, etc.). This can not only effectively prevent large debris and foreign objects from entering the air inlet cylinder and avoid damage to internal components such as noise reduction guide cylinder and filter screen, but also ensure the normal operation of the low-noise ventilation fan for long highway tunnels. Furthermore, it can facilitate the installation and removal of the protective cover, improving the convenience and efficiency of maintenance.

[0023] (7) The present invention provides a low-noise ventilation fan for long tunnels on highways. By gradually reducing the thickness of the exhaust pipe wall from the air inlet end to the air outlet end, it can not only increase the air supply efficiency, but also reduce the overall weight of the exhaust pipe, reduce material costs and installation difficulty. Attached Figure Description

[0024] To more clearly illustrate the technical solutions of the prior art and the embodiments of this application, the drawings used in the description of the prior art and the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of the overall structure of a low-noise ventilation fan for a long highway tunnel according to the present invention.

[0026] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0027] Figure 3 This is a cross-sectional view of a low-noise ventilation fan for a long highway tunnel according to the present invention.

[0028] Figure 4 for Figure 3 A magnified view of a portion of point B in the middle.

[0029] Figure 5 This is a schematic diagram of the air intake cylinder in this utility model.

[0030] Figure 6 for Figure 5 A magnified view of a portion of point C.

[0031] Explanation of reference numerals in the attached drawings: air inlet 100, mounting bracket 110, mounting cylinder 111, snap-fit ​​interface 111A, connecting rod 112, spring 113, cavity 120, air hole 130, second connecting flange 140, protective cover 150, exhaust pipe 200, third connecting flange 210, fan cylinder 300, main cylinder 310, hoisting rod 311, first connecting flange 311A, electric telescopic rod 312, base 320, motor 330, fan blade 340, noise reduction guide cylinder 400, snap-fit ​​block 410, extrusion groove 420, sound absorption layer 430, guide channel 500, filter screen 600. Detailed Implementation

[0032] To better understand the purpose, structure, and function of this utility model, the following detailed description of a low-noise ventilation fan for long highway tunnels provided by this utility model is provided in conjunction with the accompanying drawings, so that those skilled in the art can better understand and implement this utility model. However, the embodiments described are not intended to limit this utility model.

[0033] Please see Figures 1 to 6 As shown in the embodiment of this application, a low-noise ventilation fan for a long highway tunnel is provided, including an air inlet 100, an exhaust 200, a fan duct 300, and a noise reduction guide tube 400; the air outlet of the air inlet 100 and the air inlet of the exhaust 200 are respectively connected to the two ends of the fan duct 300; the noise reduction guide tube 400 is engaged and connected inside the air inlet 100 and located on the central axis of the air inlet 100, and a guide flow is formed between the guide tube 400 and the inner peripheral wall of the air inlet 100. The noise reduction guide tube 400 has two snap-fit ​​blocks 410 on one outer side wall; the air inlet 100 has a mounting bracket 110 on the inner side wall of the air outlet, and the mounting tube 111 of the mounting bracket 110 has two snap-fit ​​interfaces 111A corresponding to the snap-fit ​​blocks 410; the noise reduction guide tube 400 is connected to the snap-fit ​​interfaces 111A by snap-fit ​​blocks 410; the other end of the noise reduction guide tube 400 is tapered and extends to the air inlet end of the air inlet 100. The outer peripheral wall of the noise reduction guide tube 400 is provided with a sound-absorbing layer 430. The sound-absorbing layer 430 is made of centrifugal glass wool.

[0034] Because the system is equipped with an air inlet 100, an exhaust 200, a fan duct 300, and a noise reduction guide duct 400, and the noise reduction guide duct 400 is equipped with a snap-fit ​​block 410, and the air outlet of the air inlet 100 is equipped with a mounting bracket 110, which has a snap-fit ​​interface 111A, the combined use of these components can not only effectively reduce the noise of the airflow entering the air inlet 100, but also guide the airflow entering the fan duct 300, reduce wind resistance, reduce noise generated by airflow turbulence, and improve the noise reduction effect, thus effectively solving the technical problem of high noise during operation of ventilation fans in long highway tunnels.

[0035] Specifically, by setting up an air intake duct 100, an exhaust duct 200, and a fan duct 300, when the fan duct 300 is running, airflow enters from the exhaust duct 200 and exits from the exhaust duct 200 after flowing through the fan duct 300, thereby achieving the ventilation function of long highway tunnels. By setting up a noise reduction guide tube 400, it not only serves as a guide channel 500 formed between itself and the inner peripheral wall of the air intake duct 100, guiding the airflow in an orderly manner when it enters the air intake duct 100, reducing noise caused by turbulent phenomena such as airflow collision and swirling; but also absorbs noise by utilizing the sound-absorbing layer 430 on the surface of the noise reduction guide tube 400, thereby achieving noise reduction and silencing of the airflow entering the air intake duct 100. Meanwhile, by setting two snap-fit ​​blocks 410 on the outer side wall of one end of the noise reduction guide tube 400, and setting a mounting bracket 110 on the inner side wall of the air outlet end of the air inlet tube 100, and opening two snap-fit ​​interfaces 111A on the side wall of the mounting tube 111 of the mounting bracket 110 corresponding to the snap-fit ​​blocks 410, the snap-fit ​​blocks 410 and snap-fit ​​interfaces 111A are used to achieve quick installation and disassembly of the noise reduction guide tube 400 in the air inlet tube 100, which facilitates the maintenance and repair of the noise reduction guide tube 400.

[0036] Furthermore, the card interface 111A includes an axial groove and a transverse groove that are interconnected, and the axial groove and the transverse groove are arranged perpendicularly to each other to form an L-shape. When it is necessary to engage the card block 410 with the card interface 111A, first slide the card block 410 into the axial groove, and then rotate the noise reduction guide cylinder 400 to make the card block 410 slide from the axial groove into the transverse groove, thereby engaging the card block 410 in the transverse groove. Conversely, when it is necessary to separate the card block 410 from the card interface 111A, simply slide the card block 410 along the opposite path, making the operation simple and convenient. The fan casing 300 includes a main casing 310, a base 320, a motor 330, and fan blades 340. A lifting rod 311 is installed on each side of the outer wall of the main casing 310. An electric telescopic rod 312 is connected to each side of the upper surface of each lifting rod 311. The base 320 is fixed to the inner wall of the casing. The motor 330 is mounted on the base 320. The fan blades 340 are connected to the output shaft of the motor 330. By installing a lifting rod 311 on each side of the outer wall of the main casing 310, it works in conjunction with the electric telescopic rods 312 to mount the fan casing 300 onto the tunnel. Simultaneously, the telescopic function of the electric telescopic rods 312 allows for flexible adjustment of the height of the fan casing 300 according to actual installation requirements. In addition, a first connecting flange 311A ​​is provided at each end of the hoisting rod 311; two second connecting flanges 140 corresponding to the first connecting flanges 311A ​​are provided on the outer wall of the air outlet end of the air inlet 100; and two third connecting flanges 210 corresponding to the first connecting flanges 311A ​​are provided on the outer wall of the air inlet end of the exhaust pipe 200. When assembling the low-noise ventilation fan for this long highway tunnel, first insert the air inlet 100 and exhaust pipe 200 into the two ends of the fan cylinder 300 respectively, then align the first connecting flanges 311A ​​with the corresponding second connecting flanges 140 and third connecting flanges 210 respectively, and tighten them by passing bolts or other connecting parts through the connecting holes on the flanges. This will quickly and firmly connect the fan cylinder 300 with the air inlet 100 and exhaust pipe 200, ensuring that the connection will not loosen due to airflow impact or other factors during operation. When it is necessary to inspect or maintain the low-noise ventilation fan in the long tunnel of the highway, simply unscrew the bolts and other connecting parts on the connecting flange to easily separate the fan casing 300 from the air inlet casing 100 and the exhaust casing 200, which facilitates the inspection, repair or replacement of each component and greatly improves the efficiency of equipment installation and maintenance.

[0037] In a preferred embodiment, the mounting frame 110 includes a mounting cylinder 111 and four connecting rods 112 that are equally spaced on the outer peripheral wall of the mounting cylinder 111; the central axis of the mounting cylinder 111 is on the same straight line as the central axis of the air inlet cylinder 100, and the mounting cylinder 111 is fixed inside the air inlet cylinder 100 by the four connecting rods 112.

[0038] Since the mounting cylinder 111 is equipped with a mounting cylinder 111 and a connecting rod 112, and the central axis of the mounting cylinder 111 is on the same straight line as the central axis of the air inlet cylinder 100, it can not only improve the installation stability of the mounting bracket 110 in the air inlet cylinder 100 and provide reliable installation support for the noise reduction guide cylinder 400, but also make the width of the guide channel 500 between the noise reduction guide cylinder 400 and the inner peripheral wall of the air inlet cylinder 100 consistent at all points, so that the airflow can pass through the guide channel 500 evenly and stably, thereby effectively improving the noise reduction and airflow guiding effect.

[0039] In a preferred embodiment, the end of the mounting cylinder 111 near the noise-reducing guide cylinder 400 is open, and the end of the mounting cylinder 111 away from the noise-reducing guide cylinder 400 is closed. A spring 113 is fixed inside the mounting cylinder 111. The diameter of the noise-reducing guide cylinder 400 is smaller than the inner diameter of the mounting cylinder 111, and a compression groove 420 adapted to the spring 113 is provided at the end of the noise-reducing guide cylinder 400 near the mounting cylinder 111. When the noise-reducing guide cylinder 400 is engaged with the snap-fit ​​interface 111A through the snap-fit ​​block 410, the noise-reducing guide cylinder 400 is inserted into the mounting cylinder 111, and the spring 113 is compressed by the compression groove 420, so that the snap-fit ​​block 410 is firmly engaged in the snap-fit ​​interface 111A.

[0040] Because a spring 113 is installed inside the mounting cylinder 111 and a compression groove 420 is provided on the noise reduction guide cylinder 400, when the noise reduction guide cylinder 400 is engaged with the locking interface 111A through the locking block 410, the noise reduction guide cylinder 400 is inserted into the mounting cylinder 111, and the spring 113 is compressed by the compression groove 420, so that the locking block 410 is firmly engaged in the locking interface 111A. This not only enhances the stability of the connection between the noise reduction guide cylinder 400 and the mounting frame 110, preventing the noise reduction guide cylinder 400 from loosening or falling off during the operation of the low-noise ventilation fan in the long highway tunnel, but also buffers the vibration generated by the low-noise ventilation fan during the operation of the long highway tunnel, reducing the noise caused by vibration. At the same time, it facilitates the installation and disassembly of the noise reduction guide cylinder 400 and improves the equipment maintenance efficiency.

[0041] Specifically, by making the end of the mounting cylinder 111 near the noise-reducing guide cylinder 400 an open structure and the end away from the noise-reducing guide cylinder 400 a closed structure, the spring 113 is fixedly installed inside the mounting cylinder 111, while providing a channel for the noise-reducing guide cylinder 400 to be inserted into the mounting cylinder 111. By fixing a spring 113 inside the mounting cylinder 111, the elastic force generated by the elastic deformation of the spring 113 provides an auxiliary force for the connection between the noise-reducing guide cylinder 400 and the mounting cylinder 111. By setting the diameter of the noise-reducing guide tube 400 to be smaller than the inner diameter of the mounting tube 111, and by opening a compression groove 420 at the end of the noise-reducing guide tube 400 near the mounting tube 111 that matches the spring 113, when the noise-reducing guide tube 400 is engaged with the locking interface 111A via the locking block 410, the noise-reducing guide tube 400 can be smoothly inserted into the mounting tube 111. The compression groove 420 contacts the spring 113 and compresses the spring 113. The spring 113 is compressed and generates a reverse elastic force, causing the noise-reducing guide tube 400 to be subjected to pressure into the mounting tube 111, making the locking block 410 more firmly engaged in the locking interface 111A, thereby enhancing the stability of the connection between the noise-reducing guide tube 400 and the mounting bracket 110. In addition, during the compression process, the spring 113 can absorb and buffer the vibration generated by the low-noise ventilation fan of the long highway tunnel during operation, reducing the noise caused by vibration transmission and further improving the noise reduction effect.

[0042] In a preferred embodiment, a filter screen 600 is also included; the filter screen 600 is sleeved outside the mounting cylinder 111 and located between the snap-fit ​​interface 111A and the connecting rod 112; when the snap-fit ​​block 410 is snapped into the snap-fit ​​interface 111A, the snap-fit ​​block 410 can abut against the side of the filter screen 600.

[0043] Because of the filter screen 600, the air entering the air intake duct 100 can be filtered, intercepting dust, debris and other particles in the air, ensuring that the air entering the fan duct 300 is clean and extending the service life of the low-noise ventilation fan in the long highway tunnel. At the same time, when the snap-fit ​​block 410 is engaged in the snap-fit ​​interface 111A, the snap-fit ​​block 410 is used to limit and fix the filter screen 600. This not only prevents the filter screen 600 from sliding or falling off when impacted by airflow, but also allows the filter screen 600 to be removed after the noise reduction guide duct 400 is disassembled, making it convenient for cleaning or replacement of the filter screen 600.

[0044] In a preferred embodiment, a cavity 120 for filling sound-absorbing cotton is formed inside the side wall of the air inlet cylinder 100, and a plurality of air holes 130 communicating with the cavity 120 are provided on the inner side wall of the air inlet cylinder 100; the plurality of air holes 130 are evenly distributed around the inner peripheral wall of the air inlet cylinder 100.

[0045] Because the air intake 100 is provided with a cavity 120, which is filled with sound-absorbing cotton, and the inner wall of the air intake 100 is provided with multiple air holes 130, the sound-absorbing cotton can not only absorb the noise generated by the airflow passing through the air intake 100 and reduce the noise intensity, but also the noise can fully enter the cavity 120 and come into contact with the sound-absorbing cotton through the evenly distributed air holes 130, thereby improving the noise reduction effect.

[0046] In a preferred embodiment, the air intake end of the air intake cylinder 100 is detachably provided with a protective cover 150.

[0047] Because the air intake end of the air intake cylinder 100 is detachably equipped (such as by plug-in, snap-fit, or threaded connection) with a protective cover 150, it can not only effectively prevent large debris or foreign objects from entering the air intake cylinder 100 and avoid damaging internal components such as the noise reduction guide cylinder 400 and the filter screen 600, thus ensuring the normal operation of the low-noise ventilation fan in the long tunnel of the highway; it can also facilitate the installation and removal of the protective cover 150, improving the convenience and efficiency of maintenance.

[0048] In a preferred embodiment, the wall thickness of the exhaust stack 200 decreases sequentially from the air inlet to the air outlet. By decreasing the wall thickness of the exhaust stack 200 sequentially from the air inlet to the air outlet, not only can the air supply efficiency be increased, but the overall weight of the exhaust stack 200 can also be reduced, thereby lowering material costs and installation difficulty.

[0049] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.

Claims

1. A low-noise ventilation fan for long highway tunnels, characterized in that, It includes an air inlet cylinder (100), an exhaust cylinder (200), a fan cylinder (300), and a noise reduction guide cylinder (400); the air outlet end of the air inlet cylinder (100) and the air inlet end of the exhaust cylinder (200) are respectively connected to the two ends of the fan cylinder (300); the noise reduction guide cylinder (400) is engaged and connected inside the air inlet cylinder (100) and located on the central axis of the air inlet cylinder (100), and forms a guide channel (500) between itself and the inner peripheral wall of the air inlet cylinder (100); one of the noise reduction guide cylinders (400) Two snap-fit ​​blocks (410) are provided on the outer side wall of the end; a mounting bracket (110) is provided on the inner side wall of the air outlet end of the air inlet cylinder (100), and two snap-fit ​​interfaces (111A) corresponding to the snap-fit ​​blocks (410) are opened on the side wall of the mounting cylinder (111) of the mounting bracket (110); the noise reduction guide cylinder (400) is connected to the snap-fit ​​interface (111A) through the snap-fit ​​blocks (410); the other end of the noise reduction guide cylinder (400) is tapered and extends to the air inlet end of the air inlet cylinder (100).

2. The low-noise ventilation fan for long highway tunnels according to claim 1, characterized in that, The mounting bracket (110) includes a mounting cylinder (111) and four connecting rods (112) that are equally spaced on the outer peripheral wall of the mounting cylinder (111); the central axis of the mounting cylinder (111) and the central axis of the air inlet cylinder (100) are on the same straight line, and the mounting cylinder (111) is fixed inside the air inlet cylinder (100) by the four connecting rods (112).

3. The low-noise ventilation fan for long highway tunnels according to claim 2, characterized in that, The mounting cylinder (111) has an open structure at one end near the noise reduction guide cylinder (400), and a closed structure at the other end away from the noise reduction guide cylinder (400). A spring (113) is fixed inside the mounting cylinder (111). The diameter of the noise reduction guide cylinder (400) is smaller than the inner diameter of the mounting cylinder (111), and the end of the noise reduction guide cylinder (400) near the mounting cylinder (111) has a compression groove (420) corresponding to the spring (113). When the noise reduction guide cylinder (400) is engaged with the interface (111A) through the snap-fit ​​block (410), the noise reduction guide cylinder (400) is inserted into the mounting cylinder (111), and the spring (113) is compressed by the compression groove (420), so that the snap-fit ​​block (410) is firmly engaged in the interface (111A).

4. The low-noise ventilation fan for long highway tunnels according to claim 2 or 3, characterized in that, It also includes a filter screen (600); the filter screen (600) is sleeved outside the mounting cylinder (111) and located between the card interface (111A) and the connecting rod (112); when the card block (410) is engaged and connected inside the card interface (111A), the card block (410) can abut against the side of the filter screen (600).

5. The low-noise ventilation fan for long highway tunnels according to claim 4, characterized in that, The outer peripheral wall of the noise reduction guide tube (400) is provided with a sound-absorbing layer (430).

6. The low-noise ventilation fan for long highway tunnels according to claim 4, characterized in that, The air inlet cylinder (100) has a cavity (120) inside its side wall for filling with sound-absorbing cotton, and the air inlet cylinder (100) has a plurality of air holes (130) that communicate with the cavity (120) on its inner side wall; the plurality of air holes (130) are evenly distributed around the inner peripheral wall of the air inlet cylinder (100).

7. The low-noise ventilation fan for long highway tunnels according to claim 4, characterized in that, The fan casing (300) includes a main casing (310), a base (320), a motor (330), and fan blades (340); a hoisting rod (311) is provided on each side of the outer wall of the main casing (310); an electric telescopic rod (312) is connected to each side of the upper surface of each hoisting rod (311); the base (320) is fixed to the inner wall of the casing; the motor (330) is mounted on the base (320); and the fan blades (340) are connected to the output shaft of the motor (330).

8. The low-noise ventilation fan for long highway tunnels according to claim 7, characterized in that, The hoisting rod (311) has a first connecting flange (311A) at each end; the outer wall of the air outlet of the air inlet (100) has two second connecting flanges (140) corresponding to the first connecting flanges (311A); the outer wall of the air inlet of the exhaust pipe (200) has two third connecting flanges (210) corresponding to the first connecting flanges (311A).

9. The low-noise ventilation fan for long highway tunnels according to claim 4, characterized in that, The air intake end of the air intake cylinder (100) is detachably equipped with a protective cover (150).

10. The low-noise ventilation fan for long highway tunnels according to claim 4, characterized in that, The wall thickness of the exhaust pipe (200) decreases sequentially from the air inlet end to the air outlet end.

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