Fog gun barrel and fog gun vehicle

Abstract

The utility model relates to the technical field of municipal administration, and provides a fog gun barrel and a fog gun lorry, and the fog gun barrel comprises a barrel body, a spraying assembly and a silencing layer; the two axial ends of the barrel are open, the first end, in the axial direction, of the barrel is an air inlet end, the second end, in the axial direction, of the barrel is a spraying end, and the spraying assembly is arranged in the barrel and used for generating water mist and spraying the water mist out of the spraying end; the silencing layer comprises a silencing cotton layer and a damping layer; the silencing cotton layer is arranged on the inner wall of the barrel in an attached mode, and the damping layer is arranged on the silencing cotton layer in an attached mode. According to the utility model, the silencing cotton layer and the damping layer are arranged in the cylinder body, and the silencing cotton layer is beneficial to isolating noise in the cylinder body. The damping performance of the damping layer can restrain vibration of the cylinder body and reduce noise. Noise of the fog gun barrel is reduced by preventing noise transmission and improving vibration.

Description

Technical Field

[0001] This utility model relates to the field of municipal technology, and in particular to a fog cannon tube and a fog cannon vehicle. Background Technology

[0002] With increasing environmental awareness, effective ways and methods to control air pollution and reduce the concentration of particulate matter in the air have been extensively studied.

[0003] Fog cannons are a means of reducing the concentration of particulate matter in the air. They suppress dust by spraying extremely fine water mist particles, decomposing and diluting the concentration of particulate matter in the air, thus effectively controlling dust pollution. They are also widely used due to their long range, wide coverage, and flexibility in terms of time and location of use. However, as fog cannons become more widely adopted, while dust pollution has been largely controlled, the operation of these vehicles generates significant noise from the fans and the spraying of water mist, creating new environmental problems.

[0004] Fog cannons are designed with high flow rate and high thrust as their main specifications. The noise they generate during operation is mainly rotating mechanical fluid noise, including turbulent noise and fluid vibration noise. Turbulent noise is mainly caused by unsteady internal flow. From the perspective of the generation mechanism of turbulent noise, it can be mainly divided into two categories: rotational noise (discrete noise) and eddy noise (broadband noise). Flow-induced vibration noise is caused by the vibration of the structure due to the turbulent pulsation and acoustic pulsation pressure generated by the fluid flow.

[0005] Existing fog cannons lack noise reduction features, resulting in significant noise from turbulence and fluid vibration. Therefore, minimizing the noise generated during fog cannon operation is a crucial technical challenge that must be overcome for the long-term widespread application of fog cannons. Utility Model Content

[0006] The purpose of this utility model is to provide a fog cannon and a fog cannon vehicle, which reduces the noise when the fog cannon sprays fine water mist particles by improving the fog cannon.

[0007] This utility model provides a fog cannon tube, comprising: a tube body, a spray assembly, and a sound-absorbing layer;

[0008] The cylinder is open at both ends along its axial direction. The first end of the cylinder along its axial direction is the air inlet end, and the second end of the cylinder along its axial direction is the spray end. The spray assembly is built into the cylinder to generate water mist and spray it out from the spray end.

[0009] The sound-absorbing layer includes a sound-absorbing cotton layer and a damping layer; the sound-absorbing cotton layer is attached to the inner wall of the cylinder, and the damping layer is attached to the sound-absorbing cotton layer.

[0010] Furthermore, the sound-absorbing layer also includes a metal foil layer, which is attached to the sound-absorbing cotton layer.

[0011] Furthermore, the damping layer is a butyl rubber layer.

[0012] Furthermore, the metal foil layer is an aluminum foil layer.

[0013] Furthermore, the fog cannon also includes a multi-frequency active silencer, which is disposed on the outer wall of the cannon body.

[0014] Furthermore, the multi-frequency active silencer is disposed on the outer wall of the cylinder near its spray end.

[0015] Furthermore, the spray assembly includes a fan, a spray pipe, and a nozzle;

[0016] The fan is disposed inside the cylinder for blowing air to the spray end, the nozzle is disposed inside the cylinder and is located on the side of the fan near the spray end, and the nozzle is disposed on the nozzle and communicates with the inner cavity of the nozzle.

[0017] Furthermore, the fog cannon also includes a filter screen, which is disposed at the spray end.

[0018] Furthermore, along the axial direction of the cylinder from the first end to the second end, the inner diameter of the cylinder gradually decreases.

[0019] This utility model also provides a fog cannon vehicle, which includes the fog cannon tube described above.

[0020] In this invention, the cylinder body is equipped with a sound-absorbing cotton layer and a damping layer. The sound-absorbing cotton layer helps to isolate noise within the cylinder. The damping property of the damping layer can suppress cylinder vibration and reduce noise. The noise of the fog cannon cylinder is reduced by blocking noise transmission and improving vibration.

[0021] In addition, a metal foil layer is provided inside the middle cylinder of this utility model. The metal foil layer can protect the sound-absorbing cotton layer and the damping layer, and also has sound insulation and waterproof functions. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a fog cannon vehicle according to an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a fog cannon barrel according to an embodiment of the present invention;

[0024] Figure 3 This is a block diagram illustrating the principle and structure of a multi-frequency active muffler according to an embodiment of the present invention.

[0025] Figure 4This is a noise reduction waveform diagram of an embodiment of the present invention. Detailed Implementation

[0026] The fog cannon and fog cannon vehicle proposed in this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this utility model will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this utility model.

[0027] Combination Figure 1 As shown, this embodiment provides a fog cannon vehicle, including a vehicle body 100, a water tank 200, a water pump 300, a fog cannon 400, and a support 500.

[0028] The vehicle body 100 is consistent with existing municipal spray trucks. The water tank 200 is rectangular and is mounted on the vehicle body 100. The mist cannon 400 is mounted on the bracket 500, which is also mounted on the vehicle body 100. The water tank 200 is located between the bracket 500 and the front of the vehicle. The inlet of the water pump 300 is connected to the water tank 200, and the outlet of the water pump 300 is connected to the mist cannon 400, for supplying liquid to the mist cannon 400.

[0029] Please continue to refer to this. Figure 1 As shown, the support frame 500 includes a base 510, a support frame 520, and a telescopic component 530. The base 510 is mounted on the vehicle body 100 and is a block structure, serving to stabilize the entire support frame 500. The support frame 520 is a U-shaped frame, fixedly connected to the base 510, with its opening facing upwards. The fog cannon 400 is located within the support frame 520 and rotatably connected to its two upright arms. The telescopic component 530 connects the base 510 and the fog cannon 400. The telescopic component 530, for example, is a hydraulic cylinder. It serves two purposes: firstly, it stabilizes the fog cannon 400; secondly, its extension and retraction can drive the fog cannon 400 to rotate, adjusting its elevation angle. The remaining structure of the fog cannon vehicle can remain consistent with existing structures and will not be described in detail here.

[0030] Please refer to Figure 2 As shown, the fog cannon 400 includes: a cylinder body 10, a spray assembly 20, a sound-absorbing layer 30, a multi-frequency active silencer 40, and a filter screen 50.

[0031] The cylinder 10 is a cylindrical tube with a variable diameter, and the first end of the cylinder 10 along its axial direction ( Figure 2 (right end) towards the second end ( Figure 2 The inner diameter of the cylinder 10 gradually decreases from the left end. The cylinder 10 has openings at both axial ends, and the first end of the cylinder 10 along its axial direction (…) Figure 2The right end of the cylinder 10 is the air inlet, and the second end of the cylinder 10 along its axial direction is the air inlet. Figure 2 The left end of the cylinder 10 is the spray end. Therefore, the inner diameter of the air inlet end of the cylinder 10 is larger than the inner diameter of the spray end. As the airflow enters through the air inlet end and flows towards the spray end, the airflow becomes accelerated due to the smaller flow cross-sectional area, and is sprayed out at high speed from the spray end.

[0032] Please continue to refer to this. Figure 2 As shown, the spray assembly 20 is built into the cylinder 10 to generate water mist and spray it out from the spray end.

[0033] The spray assembly 20 includes a fan 21, a spray pipe 22, and a nozzle 23;

[0034] The fan 21 includes a first bracket 211, a second bracket 212, a motor 213, a drive shaft 214, and fan blades 215.

[0035] The first bracket 211 is fixedly connected to the inner wall of the cylinder 10. The motor 213 is fixedly mounted on the first bracket 211. The output shaft of the motor 213 is driven by one end of the transmission shaft 214. An external cable is connected to the motor, and the cable can be sealed through the side wall of the cylinder 10. The other end of the transmission shaft 214 is fixedly connected to the fan blade 215, wherein the transmission shaft 214 and the fan blade 215 are coaxially arranged with the cylinder 10. The second bracket 212 is fixedly connected to the inner wall of the cylinder 10. The first bracket 211 is located at the air inlet end of the cylinder 10 where the second bracket 212 is located. Figure 2 Between the right end of the first bracket 211 and the second bracket 212, the middle part of the drive shaft 214 is rotatably mounted on the second bracket 212 via a bearing. The second bracket 212 serves to stabilize the drive shaft 214. The distance between the first bracket 211 and the second bracket 212 along the axial direction of the cylinder 10 can be adaptively adjusted.

[0036] In this embodiment, the fan blade 215 can be straight, curved, or other types, and can have a 3-blade, 5-blade, or 7-blade structure. The fan blade 215 can be selected based on usage requirements, which will not be elaborated here.

[0037] The aforementioned fan 21 can blow air towards the spray end, so the airflow passes through the air inlet of the cylinder 10. Figure 2 (right end) towards the spray end ( Figure 2 (The left end of the middle) flows.

[0038] Please continue to refer to this. Figure 2 As shown, the nozzle 22 is disposed inside the cylinder 10, and the nozzle 22 is located near the spray end of the fan 21. Figure 2 On the left side of the nozzle 22, the nozzle 23 is disposed on the nozzle 22 and communicates with the inner cavity of the nozzle 22.

[0039] The nozzle 22 is connected to the liquid outlet of the water pump 300, which supplies liquid into the nozzle 22, which is then sprayed out through the nozzle 23 to form mist particles. The outlet of the nozzle 23 faces the spray end of the cylinder 10. Figure 2 (Left end of the middle). Water pump 300 is preferably a high-pressure water pump.

[0040] Nozzle 23 is preferably a high-pressure atomizing nozzle. A high-pressure atomizing nozzle is a device that uses high-pressure water flow to create mist through a nozzle. Its principle is that water expands rapidly under ultra-high pressure, causing the water flow velocity to decrease sharply, producing extremely fine atomized particles and achieving a uniform spray effect over a large working area. Using a high-pressure atomizing nozzle can spray water mist into the air, achieving effects such as cooling, increasing humidity, etc.

[0041] The nozzle 23 can be a columnar nozzle, a fan-shaped nozzle, a rotating nozzle, etc. The nozzle 23 can be selected based on actual usage requirements, such as using a TB type nozzle. The structure, principle, and installation method of the nozzle 23 are existing technologies and will not be described in detail here.

[0042] The mist particles sprayed from nozzle 23 are directed by fan 21 towards the spray end ( Figure 2 The air is blown out from the left end of the nozzle, causing the mist-like particles to be ejected in a jet-like pattern.

[0043] In this embodiment, the nozzle 22 is an annular tube with multiple nozzles 23 connected to its circumference. The nozzle 22 is welded to the inner wall of the cylinder 10 via a connecting rod. In other alternative embodiments, the nozzle 22 can be a spiral structure or other irregular structure, and the specific distribution of the nozzle 22 can be adaptively adjusted based on actual usage requirements.

[0044] In this embodiment, the spray assembly 20 adopts a structure of fan 21, nozzle 22, and spray head 23. In other alternative embodiments, the spray assembly 20 may have the same structure as the spray assembly 20 in an existing fog cannon.

[0045] Please continue to refer to this. Figure 2 As shown, the sound-absorbing layer 30 is attached to the inner wall of the cylinder 10 for passive noise reduction, and the multi-frequency active silencer 40 is disposed on the outer wall of the cylinder 10 for active noise reduction.

[0046] The sound-absorbing layer 30 includes a sound-absorbing cotton layer 31, a damping layer 32, and a metal foil layer 33 arranged sequentially.

[0047] The sound-absorbing cotton layer 31 is adhered to the inner wall of the cylinder 10. The sound-absorbing cotton is made of 100% polyester fiber, hot-pressed and arranged in a cocoon shape, possessing sound-absorbing properties. The sound-absorbing cotton is also adhered to the inner wall of the cylinder 10 by a high-viscosity coating, ensuring that the sound-absorbing cotton layer 31 adheres tightly to the inner wall of the fog cannon. The sound-absorbing cotton layer 31 helps to isolate noise inside the cylinder 10. The sound-absorbing cotton layer 31 is prior art and will not be described in detail here.

[0048] The damping layer 32 is adhered to the sound-absorbing cotton layer 31. In this embodiment, the damping layer 32 is a butyl rubber layer. The damping layer 32 can also be made of other elastic materials with damping and vibration reduction properties. The damping property of the butyl rubber layer can suppress cylinder vibration and reduce noise. A high-viscosity coating is uniformly applied to the butyl rubber layer to adhere it to the sound-absorbing cotton layer 31, ensuring that the butyl rubber layer adheres tightly to the sound-absorbing cotton.

[0049] A metal foil layer 33 is bonded to the sound-absorbing cotton layer 31. In this embodiment, the metal foil layer 33 is an aluminum foil layer. Other metals, such as copper foil, can also be used. The metal foil layer 33 can be adhered to the butyl rubber layer through a vulcanization process, or the two can be tightly adhered through a high-viscosity coating. The metal foil layer 33 protects the sound-absorbing cotton layer 31 and the damping layer 32, and also provides sound insulation and waterproofing.

[0050] The aforementioned sound-absorbing layer 30 can, on the one hand, block the transmission of noise from inside the cylinder 10 to the outside, and on the other hand, suppress cylinder vibration through the damping effect of the damping layer, thus comprehensively reducing noise.

[0051] In this embodiment, the nozzle 22, the first support 211, and the second support 212 are all connected to the inner wall of the cylinder 10. Therefore, the inner wall of the cylinder 10 has multiple connection points that pass through the sound-absorbing layer 30. These connection points should be sealed, for example, by applying sealant or by setting a sealing ring, to prevent liquid from leaking inward through the connection points.

[0052] Please continue to refer to this. Figure 1 As shown, the multi-frequency active silencer 40 is disposed on the outer wall of the cylinder 10 near its spray end. The multi-frequency active silencer 40 is positioned on the side of the cylinder 10 near the spray end along its axial center, i.e., within the range near the spray end. Preferably, the multi-frequency active silencer 40 is positioned corresponding to the position of the nozzle 22, where the vibration amplitude is larger, thus achieving a precise noise suppression effect.

[0053] The multi-frequency active silencer mainly adopts active noise reduction technology. Its principle is based on the fact that all sounds are composed of a certain spectrum. By generating a series of sound waves with the same spectrum as the noise of the cylinder 10 but opposite in phase, the sound waves of the noise source cancel each other out, thereby achieving the purpose of noise reduction.

[0054] Please refer to Figure 3 As shown, the multi-frequency active muffler 40 has a built-in processor 41, an active muffler control port 42, and a noise sensor 43.

[0055] The processor 41 can be a CPU, DSP, ASIC, FPGA or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0056] After acquiring the noise information of the cylinder 10, the noise sensor 43 sends it to the processor 41. The processor 41 performs noise information calculation and analysis and triggers the signal generator in the control port 42 of the active silencing device to synchronously generate a compensation signal with the same spectrum and opposite phase as the noise of the cylinder 10.

[0057] Please refer to Figure 4 As shown, the noise signal and the synchronously opposite compensation signal emitted by the control port 42 of the active noise reduction device cancel each other out to form a residual noise signal, thereby achieving the purpose of noise reduction.

[0058] The structure, principle, and usage of the multi-frequency active muffler 40 are all existing technologies. The multi-frequency active muffler 40 can be purchased from existing models, such as using an ANC type active noise cancellation module or other existing active noise cancellation equipment.

[0059] Please continue to refer to this. Figure 2 As shown, the filter 50 is disposed at the spray end ( Figure 2 (Right end of the cylinder). Filter screen 50 can be, for example, a mesh metal filter screen, which mainly prevents large particles of foreign matter from entering the cylinder.

[0060] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0061] The above description is only a description of the preferred embodiment of the present utility model and is not intended to limit the scope of the present utility model in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A fog cannon barrel, characterized in that, include: Cylinder body, spray assembly, and sound-absorbing layer; The cylinder is open at both ends along its axial direction. The first end of the cylinder along its axial direction is the air inlet end, and the second end of the cylinder along its axial direction is the spray end. The spray assembly is built into the cylinder to generate water mist and spray it out from the spray end. The sound-absorbing layer includes a sound-absorbing cotton layer and a damping layer; the sound-absorbing cotton layer is attached to the inner wall of the cylinder, and the damping layer is attached to the sound-absorbing cotton layer. The sound-absorbing cotton is made of 100% polyester fiber, which is hot-pressed and formed into a cocoon shape. The damping layer is a butyl rubber layer.

2. The fog cannon as described in claim 1, characterized in that, The sound-absorbing layer also includes a metal foil layer, which is attached to the sound-absorbing cotton layer.

3. The fog cannon as described in claim 1, characterized in that, The damping layer is a butyl rubber layer.

4. The fog cannon as described in claim 2, characterized in that, The metal foil layer is an aluminum foil layer.

5. The fog cannon as described in claim 1, characterized in that, The spray assembly includes a fan, a nozzle, and a spray head; The fan is disposed inside the cylinder for blowing air to the spray end, the nozzle is disposed inside the cylinder and is located on the side of the fan near the spray end, and the nozzle is disposed on the nozzle and communicates with the inner cavity of the nozzle.

6. The fog cannon as described in claim 1, characterized in that, The fog cannon also includes a filter screen, which is disposed at the spray end.

7. The fog cannon as described in claim 1, characterized in that, Along the axial direction of the cylinder, from the first end to the second end, the inner diameter of the cylinder gradually decreases.

8. A fog cannon vehicle, characterized in that, The fog cannon vehicle includes a fog cannon tube as described in any one of claims 1 to 7.

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