Tunnel fan and internet-of-things frequency conversion regulation and control device

Abstract

The invention discloses a tunnel fan. The tunnel fan comprises a fan body; the front-end silencer and the rear-end silencer comprise an outer barrel, an inner barrel and an inner barrel, the glass wool board layer is laid on the inner side wall of the outer cylinder body; the polymer metal damping sound insulation felt layer is laid on the glass wool board layer; the multiple silencing pipes are arranged in the outer barrel at intervals, multiple sets of silencing holes are formed in the side walls of the silencing pipes in an array mode, and the hole diameters of the silencing holes are sequentially decreased in the air flow direction; and the frequency converter is connected with a motor of the fan body. The transmission of noise can be absorbed, blocked and reduced, and an efficient noise reduction effect is provided for the fan body. The invention further discloses an internet-of-things frequency conversion regulation and control device which comprises an internet-of-things module which is provided with a gateway module, is connected with the frequency converter and is used for receiving an issued instruction and controlling the motor of the fan body through the frequency converter; a mobile client; a fan remote controller; and the central dispatching room display screen realizes remote control of the frequency converter by the mobile client, adjusts the operation parameters of the fan body, and adapts to the environment state of the tunnel.

Description

Technical Field

[0001] The present invention relates to the field of tunnel ventilation equipment, and more specifically, to a tunnel fan and an Internet of Things frequency conversion control device. Background Art

[0002] The ventilation system is an important part of ensuring the safety of workers and the quality of the project. A good ventilation duct can ensure that there is enough fresh air supply in the tunnel and effectively remove harmful gases and dust. However, during the operation of the tunnel fan, due to the rotation of the impeller, blade passing frequency noise will be generated. This noise is caused by the periodic rotation of the blades and is generated at a specific base frequency and multiple frequency. This noise has obvious periodic characteristics, and the frequency is related to the blade speed and the number of blades. Broadband noise will also be generated. Broadband noise is emitted when the airflow separates after forming turbulence on the blade surface. Its spectrum has no obvious fluctuations in the entire frequency range and presents a broadband characteristic. Broadband noise is mainly caused by the separation of the turbulent boundary layer or the blade. Aerodynamic noise will also be generated. Aerodynamic noise includes discrete noise and broadband noise. According to the theory of fan aerodynamic noise, discrete noise is mainly generated by the periodic disturbance of the rotating blades and the air; broadband noise is mainly caused by random pulsations caused by factors such as the separation of the tip vortex and the blade wake vortex, the turbulent boundary layer, and the uneven incoming flow. Low-frequency noise will also be generated, including steady-load noise generated by the rotation of blades or lift surfaces and unsteady-load noise generated by blades passing through local loss areas or wake areas of flow. Incoming turbulence interference noise will also be generated, which is broadband noise generated by the interference of incoming turbulence and blades, and is difficult to quantify due to the instability of incoming air. Blade self-noise will also be generated, including trailing edge noise, blade tip noise, separation noise and laminar boundary layer noise, which have typical broadband characteristics. Therefore, the noise frequency distribution range of tunnel fans is relatively wide, ranging from low frequency to high frequency. If noise treatment is not performed, it will seriously affect the comfort of the tunnel environment and the health of construction workers.

[0003] In the prior art, for example, Chinese patent application CN216343060U discloses a built-in suction muffler for a fan, including a muffler body, both sides of the muffler body are connected with mounting pipes, the surface of the mounting pipe is slidably connected with a fitting plate, an elastic fitting structure is provided between the fitting plate and the mounting pipe, both sides of the bottom of the muffler body are fixed with support plates, the outer side of the support plate is slidably connected with a vertical plate, the bottom of the vertical plate is fixed with a support seat, the inside of the support plate is provided with a limited hole, the number of the limited holes is four, the inside of the vertical plate is slidably connected with a mounting rod, and the mounting rod is slidably connected with the limiting hole. This prior art improves the noise reduction effect by improving the fit between the muffler body and the fan, but is not designed for the noise characteristics of the fan, and its improvement is very limited, and cannot meet the fan noise reduction needs in the tunnel environment. Summary of the invention

[0004] An object of the present invention is to solve at least the above problems and to provide at least the advantages which will be described hereinafter.

[0005] In order to achieve these purposes and other advantages according to the present invention, there is provided a tunnel fan, comprising: Fan body; A front end silencer and a rear end silencer, wherein the front end silencer and the rear end silencer are respectively sealed and connected to the air inlet and the air outlet of the fan body; wherein, The front end muffler and the rear end muffler have the same structure, and both include: An outer cylinder, one end of which is correspondingly and sealedly connected to the air inlet or the air outlet of the fan body; A glass wool board layer is laid on the inner wall of the outer cylinder; A polymer metal damping sound insulation felt layer, which is laid on the glass wool board layer; A plurality of silencer pipes are arranged in the outer cylinder at intervals, the axial direction of the silencer pipe is parallel to the axial direction of the outer cylinder, a plurality of groups of silencer holes are arranged in an array on the side wall of the silencer pipe, each group of silencer holes is an array, the apertures of the silencer holes in the same array are the same, and the apertures of the plurality of groups of silencer holes decrease in sequence along the wind flow direction; A frequency converter is connected to the motor of the fan body.

[0006] Preferably, the structures of the front-end muffler and the rear-end muffler further include adjustable muffler components, respectively, and the adjustable muffler components include: A resonance chamber, the cross section of which along the radial direction of the outer cylinder is elliptical, and the resonance chamber is coaxially arranged in the outer cylinder; three baffles, which are arranged in the resonance chamber at a certain distance, and divide the resonance chamber into a third resonance cavity, a first resonance cavity, a second resonance cavity and a fourth resonance cavity in sequence along the wind flow direction; A first silencer pipe is arranged at one end close to the long axis of the resonance chamber, one end of the first silencer pipe is connected to the outer cylinder, and the other end passes through the third resonance chamber and the first resonance chamber in sequence, and then is connected to the second resonance chamber, a first adjustment silencer pipe is coaxially sleeved in the first silencer pipe, a first gear is coaxially sleeved on one end of the first adjustment silencer pipe that passes through the first silencer pipe and is located in the outer cylinder, wherein the first silencer pipe contacts the side wall surface of the first adjustment silencer pipe; A second silencer pipe is arranged close to the first silencer pipe and is located at one end of the long axis at the same end of the resonance chamber, one end of the second silencer pipe is communicated with the third resonance chamber, and the other end passes through the second resonance chamber and the fourth resonance chamber in sequence, and then communicates with the outer cylinder body, a second regulating silencer pipe is coaxially rotatably sleeved in the second silencer pipe, the second regulating silencer pipe rotates and passes through the third resonance chamber, and a second gear is coaxially sleeved on one end of the second regulating silencer pipe located on the outer cylinder body, wherein the side wall and end face of the second regulating silencer pipe located in the outer cylinder body are sealed, the second gear is staggered with the first gear, and the second silencer pipe contacts the side wall of the second regulating silencer pipe; A third silencer pipe, which is symmetrically arranged with the first silencer pipe at the other end of the long axis of the resonance chamber, the third silencer pipe is located in the first resonance cavity, and its two ends are respectively connected with the third resonance cavity and the second resonance cavity, a third regulating silencer pipe is coaxially rotatably sleeved in the third silencer pipe, one end of the third regulating silencer pipe is rotated to pass through the third resonance cavity in turn, and a third gear is coaxially sleeved on one end of the third regulating silencer pipe located in the outer cylinder, wherein the side wall and end face of the third regulating silencer pipe located in the outer cylinder are sealed, and the third silencer pipe is in contact with the side wall of the third regulating silencer pipe; A driving unit, which drives the first gear, the second gear and the third gear to rotate synchronously respectively; The first muffler pipe, the second muffler pipe and the third muffler pipe are all provided with a plurality of groups of external muffler holes in an array in sequence along the wind flow direction of the fan body, each group of external muffler holes is an array, the apertures of the external muffler holes in the same array are the same, and the apertures of the plurality of groups of external muffler holes decrease in sequence along the wind flow direction; The first regulating silencer pipe, the second regulating silencer pipe and the third regulating silencer pipe are all provided with a plurality of groups of first silencer holes and a plurality of groups of second silencer holes in an array in sequence along the wind flow direction of the fan body, the first silencer holes and the second silencer holes are alternately arranged along the circumferential side wall, each group of first silencer holes is an array, the first silencer holes in the same array have the same aperture, the apertures of the plurality of groups of first silencer holes decrease in sequence along the wind flow direction, and the apertures of the plurality of groups of first silencer holes correspond to the apertures of the outer silencer holes in the radial direction, each group of second silencer holes is an array, the apertures of the plurality of groups of second silencer holes are the same, and the apertures of the second silencer holes are not larger than the apertures of the outer silencer holes with the smallest apertures; When the driving unit drives the first gear, the second gear and the third gear to rotate to a first position, the first muffler hole is coaxially aligned with the outer muffler hole; When the driving unit drives the first gear, the second gear, and the third gear to rotate to a second position, the second muffler hole is coaxially aligned with the outer muffler hole.

[0007] Preferably, the driving unit comprises: A driving motor is installed in the outer cylinder, and the driving motor is connected to the frequency converter; A reduction gearbox, whose input shaft is coaxially fixed with the output shaft of the driving motor, and the reduction gearbox has a first output shaft, a second output shaft and a third output shaft arranged in a certain position, and the first output shaft, the second output shaft and the third output shaft are coaxially sleeved with a first driving gear, a second driving gear and a third driving gear, respectively, wherein the second driving gear and the third driving gear are staggered, and the first driving gear, the second driving gear and the third driving gear are respectively meshed with the first gear, the second gear and the third gear.

[0008] Preferably, the number of groups of silencer holes, the number of groups of external silencer holes, the number of groups of first silencer holes and the number of groups of second silencer holes are all 4, the apertures of the four groups of silencer holes, the four groups of external silencer holes and the four groups of first silencer holes are 3 mm, 2 mm, 1.5 mm and 1 mm respectively along the wind flow direction, and the apertures of the four groups of second silencer holes are all 1 mm.

[0009] Preferably, a plurality of silencer pipes are arranged at intervals along the circumferential direction outside the resonance chamber.

[0010] Provide an Internet of Things frequency conversion control device for controlling the tunnel fan; The Internet of Things frequency conversion control device comprises: An Internet of Things module, which is arranged on the wind tube of the fan body, and a gateway module is arranged on the Internet of Things module, and the gateway module is connected to the inverter through an interface, and the gateway module is used to receive the issued instructions and control the motor of the fan body and / or the drive motor through the inverter to complete the instructions; A data acquisition module, which is in communication with the gateway module and is used to collect environmental data in the tunnel; A mobile client, which is in communication connection with the gateway module, and is used to issue instructions and transmit them to the gateway module via a mobile network, and is used to receive the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to receive the operating parameters of the motor of the fan body and / or the drive motor and transmitted uplink by the frequency converter; A wind turbine remote controller, which is in communication connection with the gateway module, receives the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to issue instructions and transmit them to the gateway module through the network; The central dispatching room display screen is connected to the fan remote controller interface, and the central dispatching room display screen is used to display the environmental data in the tunnel, and is used to display the operating parameters of the motor of the fan body and / or the drive motor.

[0011] Preferably, the tunnel environment data includes gas concentration.

[0012] Preferably, the operating parameters of the motor of the fan body include operating frequency and air volume, and the operating parameters of the drive motor include driving the first gear, the second gear and the third gear to rotate to the first position or the second position.

[0013] The present invention has at least the following beneficial effects: First, after the motor is started, the tunnel fan can supply fresh air to the tunnel, or draw dirty air from the tunnel to the outside of the tunnel to ensure the safety of the tunnel environment. However, noise will be generated during operation. By setting a front-end muffler located at the air inlet of the fan body, the dynamic noise generated by the fan body when inhaling air can be reduced. By setting a rear-end muffler located at the air outlet of the fan body, the dynamic noise and airflow noise generated by the fan body when exhausting air can be reduced.

[0014] Second, when the speed of the blade increases, the frequency of the noise generated will also increase. When the impeller speed reaches a certain value, the first gear, the second gear and the third gear are driven to rotate to the second position so that the second muffler hole is coaxially aligned with the outer muffler hole, thereby changing the actual aperture. The smaller the aperture, the better the muffler effect on high-frequency sound. When the impeller speed is lower than the set value, the first gear, the second gear and the third gear are driven back to the first position to enhance the muffler effect on low-frequency sound.

[0015] Third, based on the motor speed, impeller speed, wind tube size and blade size of the fan body commonly used in tunnels, setting the apertures to 3 mm, 2 mm, 1.5 mm and 1 mm is conducive to achieving the most efficient reduction in noise during normal operation of the fan body.

[0016] Fourth, by setting up the Internet of Things module, the Internet of Things module acts as a central controller, and realizes data collection and remote monitoring through connection with other components (data acquisition module, etc.), thereby improving ventilation efficiency and reducing energy consumption, and improving the response speed and accuracy of ventilation.

[0017] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1A schematic diagram of the top view of the tunnel fan according to one of the technical solutions of the present invention; Figure 2 A schematic diagram of the side structure of the fan body according to one of the technical solutions of the present invention; Figure 3 A longitudinal cross-sectional schematic diagram of a position of the front end muffler according to one of the technical solutions of the present invention; Figure 4 A schematic diagram of the position distribution of the muffler pipe and the adjustable muffler assembly according to one of the technical solutions of the present invention; Figure 5 A schematic cross-sectional view of the long axis of the adjustable muffler assembly according to one of the technical solutions of the present invention; Figure 6 A schematic diagram of the internal structure of a reduction gear box in the drive unit according to one of the technical solutions of the present invention; Figure 7 A transmission schematic diagram of the driving unit according to one of the technical solutions of the present invention; Figure 8 A schematic diagram of an array of the first muffler holes and the second muffler holes according to one of the technical solutions of the present invention; Fig. 9 It is a cross-sectional schematic diagram of a side wall when the first gear, the second gear, and the third gear are located at a first position according to one technical solution of the present invention; Fig.10 It is a cross-sectional schematic diagram of a side wall when the first gear, the second gear, and the third gear of one technical solution of the present invention are located at the second position; Fig.11 The present invention is a flow chart of the frequency conversion control device of the Internet of Things according to one of the technical solutions of the present invention.

[0019] Explanation of the numbers in the drawings in the specification: fan body 100, front silencer 200, rear silencer 300, outer cylinder 21, glass wool board layer 22, polymer metal damping sound insulation felt layer 23, silencer pipe 24, inverter 400, adjustable silencer assembly 500, third resonance cavity 50, first resonance cavity 51, second resonance cavity 52, fourth resonance cavity 53, first silencer pipe 54, first adjustment silencer pipe 55, second silencer pipe 56, second adjustment silencer pipe 57, third silencer pipe 58, third adjustment silencer pipe 59, drive unit 600, first gear 60, second gear 61, third gear 62, outer silencer hole 501, first silencer hole 502, second silencer hole 503, reduction gear box 63, first driving gear 64, second driving gear 65, third driving gear 66, Internet of Things module 1, mobile client 2, central dispatching room display screen 3. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0021] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the orientation or positional relationship indicated by the terms is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0022] like Figures 1 to 11 As shown, the present invention provides a tunnel fan, comprising: The fan body 100; the fan body 100 basically includes a wind tube, an impeller arranged in the wind tube, and a motor driving the impeller to rotate. Some also include a bracket for supporting the wind tube. The wind tube is also provided with a mounting frame, etc., for mounting the motor.

[0023] The front end silencer 200 and the rear end silencer 300 are respectively sealed and connected to the air inlet and the air outlet of the fan body 100; due to the rotation of the impeller, blade passing frequency noise will be generated. This noise is caused by the periodic rotation of the blades and is generated at a specific base frequency and multiple frequency. This noise has obvious periodic characteristics, and the frequency is related to the blade speed and the number of blades. Broadband noise will also be generated. Broadband noise is emitted when the airflow separates after forming turbulence on the blade surface. Its spectrum has no obvious fluctuations in the entire frequency range and presents a broadband characteristic. Broadband noise is mainly caused by the separation of the turbulent boundary layer or the blade. Aerodynamic noise will also be generated. Aerodynamic noise includes discrete noise and broadband noise. According to the theory of fan aerodynamic noise, discrete noise is mainly generated by the periodic disturbance of the rotating blades and the air; broadband noise is mainly caused by random pulsations caused by factors such as the separation of the tip vortex and the blade wake vortex, the turbulent boundary layer, and the uneven incoming flow. Low-frequency noise is also generated, including steady-load noise generated by the rotation of blades or lift surfaces and unsteady-load noise generated by blades passing through local loss areas or wake areas of flow. Incoming turbulence interference noise is also generated, which is broadband noise generated by the interference of incoming turbulence and blades. It is difficult to quantify due to the instability of incoming air. Blade self-noise is also generated, including trailing edge noise, blade tip noise, separation noise and laminar boundary layer noise, which has typical broadband characteristics. Therefore, the noise frequency distribution range of tunnel fans is relatively wide, ranging from low frequency to high frequency.

[0024] Therefore, the noise of the tunnel fan is completely absorbed by arranging the front silencer 200 and the rear silencer 300, thereby reducing the noise and improving the quality of the tunnel sound ring.

[0025] Specifically, the front end muffler 200 and the rear end muffler 300 have the same structure, and both include: The outer cylinder 21 has one end correspondingly and sealedly connected to the air inlet or the air outlet of the fan body 100; The glass wool board layer 22 is laid on the inner wall of the outer cylinder 21; the glass wool board is rolled into a cylinder and laid on the inner wall of the outer cylinder 21. The glass wool board has good sound absorption performance and can effectively reduce noise and reduce sound propagation.

[0026] The polymer metal damping sound insulation felt layer 23 is laid on the glass wool board layer 22; the polymer metal damping sound insulation felt is rolled into a cylinder and laid on the glass wool board layer 22. The polymer metal damping sound insulation felt is a high-performance sound insulation material. From the high-frequency sound domain to the low-frequency sound domain, it can significantly reduce the energy of sound penetration, has a very good inhibitory effect on both low-frequency and high-frequency sounds, and can effectively suppress the propagation of various vibrations.

[0027] A plurality of silencer pipes 24 are provided at intervals in the outer cylinder 21, the axial direction of the silencer pipes 24 is parallel to the axial direction of the outer cylinder 21, a plurality of groups of silencer holes are arrayed on the side wall of the silencer pipes 24, each group of silencer holes is an array, the apertures of the silencer holes in the same array are the same, and the apertures of the plurality of groups of silencer holes decrease successively along the wind flow direction; the silencer pipes 24 reduce noise by absorption, sound insulation and dissipation, the structural design of the silencer pipes 24 is based on acoustic principles, and the sound reduction effect is achieved by changing the propagation path of sound waves and reducing the reflection of sound waves, and by setting silencer hole arrays with different apertures, the noise in different frequency bands can be reduced, thereby adapting to the noise reduction needs of tunnel fans.

[0028] The frequency converter 400 is connected to the motor of the fan body 100. The frequency converter 400 is used to control the speed and torque of the motor, thereby controlling the air volume of the fan body.

[0029] In the above technical solution, after the motor is started, the tunnel fan can supply fresh air from outside to the tunnel, or draw dirty air from the tunnel to the outside of the tunnel to ensure the safety of the tunnel environment. However, noise will be generated during the operation. By setting the front end silencer 200, the front end silencer 200 is located at the air inlet of the fan body 100, which can reduce the dynamic noise generated by the fan body 100 when inhaling air. This noise is mainly caused by the rotation of the blades and the flow of air. The front end silencer 200 absorbs and blocks the noise from propagating outward by setting the glass wool board layer 22 and the polymer metal damping sound insulation felt layer 23, and the noise is attenuated during the propagation process by setting the silencer pipe 24, thereby achieving the purpose of reducing noise. By setting the rear end silencer 300, the rear end silencer 300 is located at the air outlet of the fan body 100, which can reduce the dynamic noise and airflow noise generated when the fan body 100 discharges air. The principle of the rear end silencer 300 is the same as that of the front end silencer 200, which will not be repeated here. In general, the front silencer 200 and the rear silencer 300 work together to provide an efficient noise reduction effect for the fan body 100 by absorbing, blocking and reducing the propagation of noise, ensuring that the noise impact of the fan body 100 on the surrounding environment is minimized when the fan body 100 is in operation.

[0030] In another technical solution, the structures of the front end muffler 200 and the rear end muffler 300 both further include an adjustable muffler assembly 500, and the adjustable muffler assembly 500 includes: A resonance chamber, the cross section of which along the radial direction of the outer cylinder 21 is elliptical, and the resonance chamber is coaxially arranged in the outer cylinder 21; Three baffles are arranged in the resonance chamber at a certain distance, and the resonance chamber is divided into a third resonance chamber 50, a first resonance chamber 51, a second resonance chamber 52 and a fourth resonance chamber 53 in sequence along the wind flow direction; A first muffler pipe 54 is provided at one end close to the long axis of the resonance chamber, one end of the first muffler pipe 54 is communicated with the outer cylinder 21, and the other end passes through the third resonance chamber 50 and the first resonance chamber 51 in sequence, and then communicates with the second resonance chamber 52, a first adjustment muffler pipe 55 is coaxially sleeved in the first muffler pipe 54, a first gear 60 is coaxially sleeved on the end of the first adjustment muffler pipe 55 that passes through the first muffler pipe 54 and is located in the outer cylinder 21, wherein the side walls of the first muffler pipe 54 and the first adjustment muffler pipe 55 are in contact; A second silencer pipe 56 is arranged close to the first silencer pipe 54 and is located at one end of the long axis at the same end of the resonance chamber. One end of the second silencer pipe 56 is communicated with the third resonance chamber 50, and the other end passes through the second resonance chamber 52 and the fourth resonance chamber 53 in sequence, and then communicates with the outer cylinder 21. A second regulating silencer pipe 57 is coaxially sleeved in the second silencer pipe 56. The second regulating silencer pipe 57 rotates and passes through the third resonance chamber 50. A second gear 61 is coaxially sleeved on one end of the second regulating silencer pipe 57 located in the outer cylinder 21. The side wall and end face of the second regulating silencer pipe 57 located in the outer cylinder 21 are sealed. The second gear 61 is staggered with the first gear 60. The side wall of the second silencer pipe 56 is in contact with the side wall of the second regulating silencer pipe 57. A third silencer pipe 58 is symmetrically arranged with the first silencer pipe 54 at the other end of the long axis of the resonance chamber. The third silencer pipe 58 is located in the first resonance cavity 51, and its two ends are respectively connected with the third resonance cavity 50 and the second resonance cavity 52. ​​A third regulating silencer pipe 59 is coaxially rotatably sleeved in the third silencer pipe 58. One end of the third regulating silencer pipe 59 rotates and passes through the third resonance cavity in turn. A third gear 62 is coaxially sleeved on one end of the third regulating silencer pipe 59 located in the outer cylinder 21. The side wall and end face of the third regulating silencer pipe 59 located in the outer cylinder 21 are sealed, and the third silencer pipe 58 is in contact with the side wall of the third regulating silencer pipe 59. A driving unit 600, which drives the first gear 60, the second gear 61 and the third gear 62 to rotate synchronously; The first muffler pipe 54, the second muffler pipe 56 and the third muffler pipe 58 are all provided with a plurality of groups of external muffler holes 501 in an array in sequence along the wind flow direction of the fan body 100, each group of external muffler holes 501 is an array, the apertures of the external muffler holes 501 in the same array are the same, and the apertures of the plurality of groups of external muffler holes 501 decrease in sequence along the wind flow direction; The first regulating silencer pipe 55, the second regulating silencer pipe 57 and the third regulating silencer pipe 59 are all provided with a plurality of groups of first silencer holes 502 and a plurality of groups of second silencer holes 503 in an array in sequence along the wind flow direction of the fan body 100. The first silencer holes 502 and the second silencer holes 503 are alternately arranged along the circumferential side wall. Each group of first silencer holes 502 is an array. The apertures of the first silencer holes 502 in the same array are the same. The apertures of the plurality of groups of first silencer holes 502 decrease in sequence along the wind flow direction. The apertures of the plurality of groups of first silencer holes 502 correspond to the apertures of the outer silencer holes 501 in the radial direction. Each group of second silencer holes 503 is an array. The apertures of the plurality of groups of second silencer holes 503 are the same. The apertures of the second silencer holes 503 are not larger than the aperture of the outer silencer hole 501 with the smallest aperture. When the driving unit 600 drives the first gear 60, the second gear 61 and the third gear 62 to rotate to the first position, the first muffler hole 502 is coaxially aligned with the outer muffler hole 501; When the driving unit 600 drives the first gear 60 , the second gear 61 , and the third gear 62 to rotate to the second position, the second muffler hole 503 is coaxially aligned with the outer muffler hole 501 .

[0031] In the above technical solution, the adjustable silencer assembly 500 is arranged based on the principle of the Helmholtz resonator. The sound wave enters from the outer cylinder 21 through the first silencer pipe 54, and is reflected and dissipated in the first silencer pipe 54, and then enters the second resonance cavity 52, and is reflected and dissipated in the second resonance cavity 52, and then enters the third silencer pipe 58, and is reflected and dissipated in the third silencer pipe 58, and then enters the third resonance cavity 50, and is reflected and dissipated in the third resonance cavity 50, and then enters the second silencer pipe 56, and is reflected and dissipated in the second silencer pipe 56, until it re-enters the outer cylinder 21. Among them, the second resonance cavity 52 and the third resonance cavity 50 form an effect of mutual superposition and dissipation of sound waves. This technical solution further improves the noise reduction efficiency by setting the adjustable silencer assembly 500.

[0032] Since the required air volume is different in different tunnel environments, the motor speed of the fan body 100 is different, resulting in different impeller rotation speeds and air flow rates, so that the main frequency band frequency in the generated noise frequency band will be different. When the speed of the blade increases, the noise frequency generated will also increase. The frequency corresponding to the noise signal is always a multiple of the speed (rotation frequency). This multiple relationship is the order. When the impeller speed reaches a certain value, the first gear 60, the second gear 61 and the third gear 62 are driven to rotate to the second position so that the second silencer hole 503 is coaxially aligned with the outer silencer hole 501, thereby changing the actual aperture. The smaller the aperture, the better the silencing effect on high-frequency sounds. When the impeller speed is lower than the set value, the first gear 60, the second gear 61 and the third gear 62 are driven back to the first position to enhance the silencing effect on low-frequency sounds.

[0033] In another technical solution, the driving unit 600 includes: A driving motor, which is installed in the outer cylinder 21 and connected to the frequency converter 400; The reduction gear box 63 has an input shaft coaxially fixed with the output shaft of the driving motor. The reduction gear box 63 has a first output shaft, a second output shaft and a third output shaft arranged in a certain position. The first output shaft, the second output shaft and the third output shaft are coaxially sleeved with a first driving gear 64, a second driving gear 65 and a third driving gear 66, respectively, wherein the second driving gear 65 and the third driving gear 66 are staggered, and the first driving gear 64, the second driving gear 65 and the third driving gear 66 are respectively meshed with the first gear 60, the second gear 61 and the third gear 62.

[0034] In the above technical solution, a driving method for synchronously driving the first gear 60, the second gear 61 and the third gear 62 is provided. The driving motor originally has a high speed, so the speed is reduced by the reduction gear box 63, and then the speed is synchronously reduced again through the transmission of the first driving gear 64, the second driving gear 65 and the third driving gear 66, so that the first gear 60, the second gear 61 and the third gear 62 change positions at a slow speed to adapt to the rotation needs of small torque.

[0035] In another technical solution, the number of groups of silencer holes, the number of groups of outer silencer holes 501, the number of groups of first silencer holes 502 and the number of groups of second silencer holes 503 are all 4, and the apertures of the four groups of silencer holes, the four groups of outer silencer holes 501 and the four groups of first silencer holes 502 are 3 mm, 2 mm, 1.5 mm and 1 mm respectively along the wind flow direction, and the apertures of the four groups of second silencer holes 503 are all 1 mm. Based on the motor speed, impeller speed, wind tube size and blade size of the fan body 100 commonly used in tunnels, setting the apertures of 3 mm, 2 mm, 1.5 mm and 1 mm is conducive to achieving the most efficient reduction of noise during normal operation of the fan body 100.

[0036] In another technical solution, a plurality of silencer pipes 24 are circumferentially spaced apart from each other at the periphery of the resonance chamber, and cooperate with the adjustable silencer assembly 500 to effectively absorb multi-frequency noise.

[0037] An Internet of Things frequency conversion control device is provided for controlling the tunnel fan; the Internet of Things frequency conversion control device comprises: An Internet of Things module 1, which is arranged on the wind tube of the fan body 100, and is provided with a gateway module, a transceiver antenna, an RS485 interface and a power adapter. The gateway module is connected to the inverter 400 through an interface, and the gateway module is used to receive the issued instructions and control the motor of the fan body 100 and / or the drive motor through the inverter 400 to complete the instructions; A data acquisition module is communicatively connected with the gateway module, and is used to collect environmental data in the tunnel; the environmental data in the tunnel includes gas concentration.

[0038] A mobile client 2, which is in communication connection with the gateway module via a mobile network connection, the mobile client 2 is used to issue instructions and transmit them to the gateway module via a mobile network, and is used to receive the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to receive the operating parameters of the motor and / or the drive motor of the fan body 100 and transmitted uplink by the inverter 400; A wind turbine remote controller, which is in communication connection with the gateway module, receives the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to issue instructions and transmit them to the gateway module through the network; The central dispatching room display screen 3 is connected to the fan remote controller interface, and the central dispatching room display screen 3 is used to display the tunnel environment data, and is used to display the operating parameters of the motor and / or the drive motor of the fan body 100. The operating parameters of the motor of the fan body 100 include the operating frequency and the air volume, and the operating parameters of the drive motor include driving the first gear 60, the second gear 61 and the third gear 62 to rotate to the first position or the second position.

[0039] In the above technical solution, the IoT module 1 and the mobile client 2 transmit signals bidirectionally, the mobile client 2 authorizes the control operation of the gateway module, and issues instructions to the inverter 400, thereby adjusting the motor of the wind turbine body 100. The data of the wind turbine body 100 and the inverter 400 are uploaded to the mobile client 2 and the central dispatch room display through the transceiver antenna by the mobile network.

[0040] By setting up the Internet of Things module 1 and the fan remote controller, the mobile client 2 can operate the inverter 400, such as setting the fan start and stop, the operating speed, and checking the real-time status of the fan, effectively reducing reactive power loss, and realizing the real-time monitoring and adjustment function of the fan. All the inverter 400 and fan information of the mobile client 2 can be instantly integrated into the central dispatch room display for centralized monitoring and use. The rotation of the drive motor can also be adjusted according to the motor speed (impeller speed) of the fan body 100, so as to realize remote control of the position of the first gear 60, the second gear 61 and the third gear 62, so as to accurately remove noise and improve the comfort of the tunnel environment.

[0041] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. Tunnel fan, characterized in that: include: Fan body; A front end silencer and a rear end silencer, wherein the front end silencer and the rear end silencer are respectively sealed and connected to the air inlet and the air outlet of the fan body; wherein, The front end muffler and the rear end muffler have the same structure, and both include: An outer cylinder, one end of which is correspondingly and sealedly connected to the air inlet or the air outlet of the fan body; A glass wool board layer is laid on the inner wall of the outer cylinder; A polymer metal damping sound insulation felt layer, which is laid on the glass wool board layer; A plurality of silencer pipes are arranged in the outer cylinder at intervals, the axial direction of the silencer pipe is parallel to the axial direction of the outer cylinder, a plurality of groups of silencer holes are arranged in an array on the side wall of the silencer pipe, each group of silencer holes is an array, the apertures of the silencer holes in the same array are the same, and the apertures of the plurality of groups of silencer holes decrease in sequence along the wind flow direction; A frequency converter is connected to the motor of the fan body.

2. The tunnel fan according to claim 1, characterized in that: The structures of the front-end muffler and the rear-end muffler both further include an adjustable muffler component, and the adjustable muffler component includes: A resonance chamber, the cross section of which along the radial direction of the outer cylinder is elliptical, and the resonance chamber is coaxially arranged in the outer cylinder; three baffles, which are arranged in the resonance chamber at a certain distance, and divide the resonance chamber into a third resonance cavity, a first resonance cavity, a second resonance cavity and a fourth resonance cavity in sequence along the wind flow direction; A first silencer pipe is arranged at one end close to the long axis of the resonance chamber, one end of the first silencer pipe is connected with the outer cylinder, and the other end passes through the third resonance chamber and the first resonance chamber in sequence, and then is connected with the second resonance chamber, a first adjustment silencer pipe is coaxially sleeved in the first silencer pipe, a first adjustment silencer pipe passes through the end of the first silencer pipe located in the outer cylinder and is coaxially sleeved with a first gear, wherein the first silencer pipe contacts the side wall of the first adjustment silencer pipe; A second silencer pipe is arranged close to the first silencer pipe and is located at one end of the long axis at the same end of the resonance chamber, one end of the second silencer pipe is communicated with the third resonance chamber, and the other end passes through the second resonance chamber and the fourth resonance chamber in sequence, and then is communicated with the outer cylinder body, a second regulating silencer pipe is coaxially rotatably sleeved in the second silencer pipe, the second regulating silencer pipe rotates to pass through the third resonance chamber, and a second gear is coaxially sleeved on one end of the second regulating silencer pipe located in the outer cylinder body, wherein the side wall and end face of the second regulating silencer pipe located in the outer cylinder body are sealed, the second gear is staggered with the first gear, and the second silencer pipe contacts the side wall of the second regulating silencer pipe; A third silencer pipe, which is symmetrically arranged with the first silencer pipe at the other end of the long axis of the resonance chamber, the third silencer pipe is located in the first resonance cavity, and its two ends are respectively connected with the third resonance cavity and the second resonance cavity, a third regulating silencer pipe is coaxially rotatably sleeved in the third silencer pipe, one end of the third regulating silencer pipe is rotated to pass through the third resonance cavity in turn, and a third gear is coaxially sleeved on one end of the third regulating silencer pipe located in the outer cylinder, wherein the side wall and end face of the third regulating silencer pipe located in the outer cylinder are sealed, and the third silencer pipe is in contact with the side wall of the third regulating silencer pipe; A driving unit, which drives the first gear, the second gear and the third gear to rotate synchronously respectively; The first muffler pipe, the second muffler pipe and the third muffler pipe are all provided with a plurality of groups of external muffler holes in an array in sequence along the wind flow direction of the fan body, each group of external muffler holes is an array, the apertures of the external muffler holes in the same array are the same, and the apertures of the plurality of groups of external muffler holes decrease in sequence along the wind flow direction; The first regulating silencer pipe, the second regulating silencer pipe and the third regulating silencer pipe are all provided with a plurality of groups of first silencer holes and a plurality of groups of second silencer holes in an array in sequence along the wind flow direction of the fan body, the first silencer holes and the second silencer holes are alternately arranged along the circumferential side wall, each group of first silencer holes is an array, the first silencer holes in the same array have the same aperture, the apertures of the plurality of groups of first silencer holes decrease in sequence along the wind flow direction, and the apertures of the plurality of groups of first silencer holes correspond to the apertures of the outer silencer holes in the radial direction, each group of second silencer holes is an array, the apertures of the plurality of groups of second silencer holes are the same, and the apertures of the second silencer holes are not larger than the apertures of the outer silencer holes with the smallest apertures; When the driving unit drives the first gear, the second gear and the third gear to rotate to a first position, the first muffler hole is coaxially aligned with the outer muffler hole; When the driving unit drives the first gear, the second gear, and the third gear to rotate to a second position, the second muffler hole is coaxially aligned with the outer muffler hole.

3. The tunnel fan according to claim 2, characterized in that: The driving unit comprises: A driving motor is installed in the outer cylinder, and the driving motor is connected to the frequency converter; A reduction gearbox, whose input shaft is coaxially fixed with the output shaft of the driving motor, and the reduction gearbox has a first output shaft, a second output shaft and a third output shaft arranged in a certain position, and the first output shaft, the second output shaft and the third output shaft are coaxially sleeved with a first driving gear, a second driving gear and a third driving gear, respectively, wherein the second driving gear and the third driving gear are staggered, and the first driving gear, the second driving gear and the third driving gear are respectively meshed with the first gear, the second gear and the third gear.

4. The tunnel fan according to claim 2, characterized in that: The number of groups of silencer holes, the number of groups of external silencer holes, the number of groups of first silencer holes and the number of groups of second silencer holes are all 4. The apertures of the four groups of silencer holes, the four groups of external silencer holes and the four groups of first silencer holes are 3 mm, 2 mm, 1.5 mm and 1 mm respectively along the wind flow direction. The apertures of the four groups of second silencer holes are all 1 mm.

5. The tunnel fan according to claim 2, characterized in that: A plurality of silencer pipes are arranged at intervals along the circumferential direction outside the resonance chamber.

6. Internet of Things frequency conversion control device, characterized in that: Used to control the tunnel fan as described in any one of claims 1 to 5; The Internet of Things frequency conversion control device comprises: An Internet of Things module, which is arranged on the wind tube of the fan body, and a gateway module is arranged on the Internet of Things module, and the gateway module is connected to the inverter through an interface, and the gateway module is used to receive the issued instructions and control the motor of the fan body and / or the drive motor through the inverter to complete the instructions; A data acquisition module, which is in communication with the gateway module and is used to collect environmental data in the tunnel; A mobile client, which is in communication connection with the gateway module, and is used to issue instructions and transmit them to the gateway module via a mobile network, and is used to receive the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to receive the operating parameters of the motor of the fan body and / or the drive motor and transmitted uplink by the frequency converter; A wind turbine remote controller, which is in communication connection with the gateway module, receives the tunnel environment data collected by the data acquisition module and transmitted uplink by the gateway module, and is used to issue instructions and transmit them to the gateway module through the network; The central dispatching room display screen is connected to the fan remote controller interface, and the central dispatching room display screen is used to display the environmental data in the tunnel, and is used to display the operating parameters of the motor of the fan body and / or the drive motor.

7. The Internet of Things frequency conversion control device according to claim 6, characterized in that: The tunnel environment data includes gas concentration.

8. The Internet of Things frequency conversion control device according to claim 6, characterized in that: The operating parameters of the motor of the fan body include operating frequency and air volume, and the operating parameters of the drive motor include driving the first gear, the second gear and the third gear to rotate to the first position or the second position.

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