Noise reduction type counter-rotating fog gun

Abstract

The invention discloses a noise reduction type disrotatory fog gun, and relates to the technical field of environmental protection. The noise reduction type contra-rotating fog gun comprises an air guide barrel, a first sound absorption barrel, a contra-rotating air outlet device and a spraying device. The first sound absorption cylinder is arranged in the air guide cylinder, a first sound absorption cavity is formed between the first sound absorption cylinder and the air guide cylinder, a plurality of first sound absorption holes are densely formed in the first sound absorption cylinder, the first sound absorption holes communicate with the first sound absorption cavity, the contra-rotating air outlet device is installed in the first sound absorption cylinder, and the spraying device is installed at the air outlet end of the air guide cylinder; the contra-rotating air outlet device comprises a driving part, a first impeller, a reverse transmission assembly and a second impeller, the driving part is connected with the first impeller, the reverse transmission assembly is connected between the first impeller and the second impeller, and the first impeller and the second impeller are coaxially arranged. According to the noise reduction type disrotatory fog gun, long-distance water mist blowing can be achieved, the operation requirements of different scenes are met, noise can be effectively reduced, and noise pollution is relieved.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and more specifically, to a noise-reducing counter-rotating fog cannon. Background Technology

[0002] A fog cannon is a dust suppression device used to reduce air pollution. The fog cannon's spraying device can spray out fine water mist, and the fan installed in the fog cannon blows the water mist to a distance to adsorb dust particles suspended in the air, reduce the concentration of particulate matter in the air, and achieve the effect of suppressing dust and cleaning and purifying the air. It is often used in construction sites, transportation ports, mining and other work environments with high dust levels.

[0003] Current fog cannons face a dilemma between water mist blowing distance and noise pollution: if the water mist blowing distance is far enough, the fan power needs to be increased, but the increase in fan power will inevitably lead to increased noise and cause noise pollution in the surrounding area; if noise pollution is reduced, the fan power needs to be reduced, but the reduction in fan power will directly lead to a shorter water mist blowing distance.

[0004] In view of this, it is particularly important to design and manufacture a noise-reducing counter-rotating fog cannon with a longer water mist blowing distance and lower noise, especially in fog cannon production. Summary of the Invention

[0005] The purpose of this invention is to provide a noise-reducing counter-rotating mist cannon that can achieve long-distance water mist blowing, meet the operational needs of different scenarios, and effectively reduce noise and alleviate noise pollution.

[0006] The present invention is achieved by the following technical solution.

[0007] A noise-reducing counter-rotating fog cannon includes an air guide tube, a first sound-absorbing tube, a counter-rotating air outlet device, and a spraying device. The first sound-absorbing tube is disposed inside the air guide tube and forms a first sound-absorbing cavity with the air guide tube. The first sound-absorbing tube is densely provided with a plurality of first sound-absorbing holes, which are connected to the first sound-absorbing cavity. The counter-rotating air outlet device is installed inside the first sound-absorbing tube, and the spraying device is installed at the air outlet end of the air guide tube. The counter-rotating air outlet device includes a driving component, a first impeller, a reverse transmission assembly, and a second impeller. The driving component is connected to the first impeller, and the reverse transmission assembly is connected between the first impeller and the second impeller. The first impeller and the second impeller are coaxially arranged, and the driving component is used to drive the first impeller and the second impeller to rotate in opposite directions.

[0008] Optionally, the blades of the first and second impellers are arranged in a mirror-symmetrical configuration; And / or, the distance between the first impeller and the second impeller is 600mm-650mm; And / or, the inlet angle of the first impeller is 4°-5° larger than the inlet angle of the second impeller.

[0009] Optionally, the reverse transmission assembly includes a housing, a first rotating shaft, a first bevel gear sleeved on the first rotating shaft, a second rotating shaft, a second bevel gear sleeved on the second rotating shaft, a third rotating shaft, a third bevel gear sleeved on the third rotating shaft, a fourth rotating shaft, and a fourth bevel gear sleeved on the fourth rotating shaft. A limiting cavity is provided inside the housing. The first, second, third, and fourth bevel gears mesh head-to-tail and are all located within the limiting cavity. The first and third rotating shafts are coaxially arranged, as are the second and fourth rotating shafts. The first, second, third, and fourth rotating shafts are all rotatably engaged with the housing. The first rotating shaft is connected to the first impeller, and the third rotating shaft is connected to the second impeller.

[0010] Optionally, the counter-rotating air outlet device further includes a drive cover, which includes a cover cylinder and a second sound-absorbing cylinder. The cover cylinder is disposed inside the second sound-absorbing cylinder and forms a second sound-absorbing cavity with the second sound-absorbing cylinder. The second sound-absorbing cylinder is densely provided with a plurality of second sound-absorbing holes, which communicate with the second sound-absorbing cavity. The drive component is disposed inside the cover cylinder.

[0011] Optionally, the drive cover also includes multiple partitions, which are arranged parallel to each other along the air outlet direction and are all located inside the second sound-absorbing cavity to divide the second sound-absorbing cavity into multiple sub-sound-absorbing cavities.

[0012] Optionally, a first partition is provided inside the first sound-absorbing cavity. The first partition extends along the air outlet direction. The first end of the first partition along the air outlet direction is connected to the first end wall of the first sound-absorbing cavity, and the second end of the first partition along the air outlet direction is spaced apart from the second end wall of the first sound-absorbing cavity.

[0013] Optionally, a second partition is also provided in the first sound-absorbing cavity. The second partition extends along the air outlet direction, with the first end of the second partition along the air outlet direction connected to the second end wall, and the second end of the second partition along the air outlet direction spaced apart from the first end wall.

[0014] Optionally, the distance between the first partition and the second partition is 10mm-20mm; And / or, the distance between the first partition and the second end wall is 30mm-50mm; And / or, the distance between the second partition and the first end wall is 30mm-50mm.

[0015] Optionally, a plurality of partitions are provided in the first sound-absorbing cavity, and the partitions are arranged parallel to each other along the air outlet direction to divide the first sound-absorbing cavity into a plurality of sub-sound-absorbing cavities.

[0016] Optionally, the ratio of the sum of the areas of the plurality of first sound-absorbing holes to the surface area of ​​the first sound-absorbing cylinder is 4%-5%; And / or, the diameter of the first sound-absorbing hole is 1.5mm-2.0mm.

[0017] Optionally, the air duct includes a first end plate, a main air section, a second end plate, an air guide section, and a third end plate connected in sequence. The first sound-absorbing cylinder includes a first sound-absorbing section and a second sound-absorbing section connected to each other. The first sound-absorbing cavity includes a first cavity section and a second cavity section. A counter-rotating air outlet device is disposed in the first sound-absorbing section. The first sound-absorbing section is disposed in the main air section and is simultaneously connected to the first end plate and the second end plate to form the first cavity section. The second sound-absorbing section is disposed in the air guide section and is simultaneously connected to the second end plate and the third end plate to form the second cavity section. The first sound-absorbing section and the main air section are both cylindrical, and the second sound-absorbing section and the air guide section are both conical.

[0018] Optionally, the air duct further includes a fourth end plate and an air inlet section, the first sound-absorbing tube further includes a third sound-absorbing section, the first sound-absorbing cavity further includes a third cavity section, the fourth end plate is connected to the first end plate through the air inlet section, the third sound-absorbing section is disposed in the air inlet section and is connected to both the fourth end plate and the first end plate to form a third cavity section, wherein both the third sound-absorbing section and the air inlet section are conical in shape.

[0019] Optionally, the noise-reducing counter-rotating fog cannon also includes a noise-reducing guide cone. The noise-reducing guide cone is disposed inside the air guide tube and located between the counter-rotating air outlet device and the spray device. The noise-reducing guide cone includes a noise-reducing plate and a third sound-absorbing tube. The third sound-absorbing tube extends along the air outlet direction, and the noise-reducing plate is connected inside the third sound-absorbing tube. The third sound-absorbing tube is densely provided with multiple third sound-absorbing holes.

[0020] Optionally, the sum of the areas of the multiple third sound-absorbing holes is 1.5%-4% of the surface area of ​​the third sound-absorbing cylinder; And / or, the diameter of the third sound-absorbing hole is 1mm-1.5mm.

[0021] Optionally, the noise reduction plate is arranged in a spiral shape with the axis of the third sound-absorbing cylinder as the center; or, there are multiple noise reduction plates, which are arranged radially with the axis of the third sound-absorbing cylinder as the center.

[0022] The noise-reducing counter-rotating fog cannon provided by this invention has the following beneficial effects: The noise-reducing counter-rotating mist cannon provided by this invention comprises a first sound-absorbing cylinder disposed within an air guide duct, forming a first sound-absorbing cavity between the cylinder and the air guide duct. The first sound-absorbing cylinder is densely covered with multiple first sound-absorbing holes, which communicate with the first sound-absorbing cavity. A counter-rotating air outlet device is installed within the first sound-absorbing cylinder, and a spraying device is installed at the air outlet end of the air guide duct. The counter-rotating air outlet device includes a driving component, a first impeller, a reverse transmission assembly, and a second impeller. The driving component is connected to the first impeller, and the reverse transmission assembly is connected between the first and second impellers. The first and second impellers are coaxially arranged, and the driving component drives the first and second impellers to rotate in opposite directions. Compared with the prior art, the noise-reducing counter-rotating mist cannon provided by this invention, due to the use of a first sound-absorbing cylinder forming a first sound-absorbing cavity with the air guide duct and densely covered with multiple first sound-absorbing holes, and a first and second impeller connected by a reverse transmission assembly, can achieve long-distance water mist blowing, meeting the operational needs of different scenarios, and effectively reducing noise and mitigating noise pollution. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of the structure of the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention from one perspective; Figure 2 This is a structural schematic diagram of the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention from another perspective; Figure 3 This is a schematic diagram of the reverse transmission component of the counter-rotating air outlet device in the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention. Figure 4 This is a schematic diagram of the drive cover of the counter-rotating air outlet device in the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention. Figure 5 This is a schematic diagram of the connection between the air guide tube and the first sound-absorbing tube in the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention. Figure 6 This is a schematic diagram of the noise-reducing guide cone in the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention, from one perspective. Figure 7 This is a schematic diagram of the noise-reducing guide cone in the noise-reducing counter-rotating fog cannon provided in the first embodiment of the present invention from another perspective. Figure 8This is a schematic diagram of the noise-reducing guide cone in the noise-reducing counter-rotating fog cannon provided in the second embodiment of the present invention, from one perspective. Figure 9 This is a schematic diagram of the noise-reducing guide cone in the noise-reducing counter-rotating fog cannon provided in the second embodiment of the present invention from another perspective.

[0025] Icons: 100-Noise-reducing counter-rotating mist cannon; 110-Air guide tube; 111-Air inlet; 112-Air outlet; 113-First end plate; 114-Main air section; 115-Second end plate; 116-Air guide section; 117-Third end plate; 118-Fourth end plate; 119-Air inlet section; 120-First sound-absorbing tube; 121-First sound-absorbing hole; 122-First sound-absorbing section; 123-Second sound-absorbing section; 124-Third sound-absorbing section; 130-Counter-rotating air outlet device; 131-Drive component; 132-First impeller; 133-Reverse transmission assembly; 1331-Housing shell; 1332-First rotating shaft; 1333-First bevel gear; 1334-Second rotating shaft; 1335-Second bevel gear Wheel; 1336-Third shaft; 1337-Third bevel gear; 1338-Fourth shaft; 1339-Fourth bevel gear; 134-Second impeller; 135-Drive cover; 1351-Cover cylinder; 1352-Second sound-absorbing cylinder; 1353-Second sound-absorbing cavity; 1354-Separator; 1355-Second sound-absorbing hole; 140-Spray device; 150-First sound-absorbing cavity; 151-First partition; 152-Second partition; 153-First cavity section; 154-Second cavity section; 155-Third cavity section; 156-Partition block; 157-Partition plate; 160-Noise-reducing guide cone; 161-Noise-reducing plate; 162-Third sound-absorbing cylinder; 163-Third sound-absorbing hole; 164-Divider plate. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this invention, it should be noted that the terms "inner," "outer," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0030] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connected," "installed," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, features in the following embodiments can be combined with each other.

[0032] First Embodiment Please refer to the reference. Figure 1 and Figure 2 This invention provides a noise-reducing counter-rotating mist cannon 100 for spraying water mist to suppress dust. It can achieve long-distance water mist delivery, meeting the operational needs of different scenarios, and effectively reduce noise and alleviate noise pollution.

[0033] The noise-reducing counter-rotating mist cannon 100 includes an air guide duct 110, a first sound-absorbing tube 120, a counter-rotating air outlet device 130, and a spray device 140. The first sound-absorbing tube 120 is disposed within the air guide duct 110, forming a first sound-absorbing cavity 150 with the air guide duct 110. The first sound-absorbing tube 120 is densely provided with multiple first sound-absorbing holes 121, which communicate with the first sound-absorbing cavity 150. The counter-rotating air outlet device 130 is installed within the first sound-absorbing tube 120 and is used to generate negative pressure to form an airflow. The air guide duct 110 has an air inlet end 111 and an air outlet end 112 arranged opposite to each other along the airflow direction. The spray device 140 is installed at the air outlet end 112 of the air guide duct 110 and is used to generate water mist. The water mist can be blown far away under the action of the airflow to achieve the effect of suppressing dust and purifying the air.

[0034] It should be noted that during the operation of the noise-reducing counter-rotating fog cannon 100, the counter-rotating air outlet device 130 generates negative pressure to form an airflow. The airflow flows within the first sound-absorbing cylinder 120, generating noise. During this process, multiple first sound-absorbing holes 121 absorb the noise into the first sound-absorbing cavity 150 and absorb the noise along the extension path of the first sound-absorbing cavity 150, thereby achieving the effect of noise reduction.

[0035] Furthermore, the counter-rotating air outlet device 130 includes a drive component 131, a first impeller 132, a reverse transmission assembly 133, and a second impeller 134. The drive component 131 is connected to the first impeller 132, and the reverse transmission assembly 133 is connected between the first impeller 132 and the second impeller 134. The first impeller 132 and the second impeller 134 are coaxially arranged, and the drive component 131 is used to drive the first impeller 132 and the second impeller 134 to rotate in opposite directions. Specifically, since the first impeller 132 and the second impeller 134 rotate in opposite directions, the eddies generated during their rotation will cancel each other out, reducing the energy loss caused by the eddies and concentrating the energy in the axial air outlet direction, effectively improving the working efficiency of the entire counter-rotating air outlet device 130. Compared with the single impeller solution in the prior art, it can effectively reduce the power of the drive component 131 (i.e., the rotational speed of the first impeller 132 and the second impeller 134) while ensuring that the water mist blowing distance remains unchanged, thereby effectively reducing the noise generated by the counter-rotating air outlet device 130 during operation and reducing noise pollution.

[0036] Thus, in the noise-reducing counter-rotating mist cannon 100 of the present invention, on the one hand, the first sound-absorbing cylinder 120, which forms a first sound-absorbing cavity 150 with the air guide duct 110 and is densely provided with a plurality of first sound-absorbing holes 121, can absorb the noise generated when the airflow flows, thereby reducing noise pollution; on the other hand, the first impeller 132 and the second impeller 134, which rotate in opposite directions under the action of the driving member 131 and the reverse transmission assembly 133, can concentrate energy in the axial air outlet direction, reduce the power of the driving member 131 while ensuring the water mist blowing distance, thereby reducing the rotational speed of the first impeller 132 and the second impeller 134, thereby reducing noise and reducing noise pollution.

[0037] Optionally, the blades of the first impeller 132 and the second impeller 134 are mirror-symmetrically arranged, that is, the bending directions of the first impeller 132 and the second impeller 134 are opposite, so as to ensure that the vortices generated by the first impeller 132 and the second impeller 134 when they rotate in opposite directions will cancel each other out.

[0038] Optionally, the distance between the first impeller 132 and the second impeller 134 is 600mm-650mm. A reasonable distance between the first impeller 132 and the second impeller 134 can ensure that there is enough space between the first impeller 132 and the second impeller 134 for vortex cancellation, ensuring that energy is concentrated in the axial air outlet direction, thereby increasing the air volume and thus increasing the water mist blowing distance.

[0039] Optionally, the first impeller 132 is positioned closer to the air inlet 111 than the second impeller 134, and the second impeller 134 is positioned closer to the air outlet 112 than the first impeller 132. The inlet angle of the first impeller 132 is 4°-5° larger than that of the second impeller 134, so as to ensure that the airflow flows stably from the air inlet 111 to the air outlet 112, and drives the water mist sprayed by the spray device 140 to be blown far away.

[0040] Please refer to Figure 3The reverse transmission assembly 133 includes a housing 1331, a first rotating shaft 1332, a first bevel gear 1333 sleeved on the first rotating shaft 1332, a second rotating shaft 1334, a second bevel gear 1335 sleeved on the second rotating shaft 1334, a third rotating shaft 1336, a third bevel gear 1337 sleeved on the third rotating shaft 1336, a fourth rotating shaft 1338, and a fourth bevel gear 1339 sleeved on the fourth rotating shaft 1338. A limiting cavity (not shown in the figure) is provided inside the housing 1331. The first bevel gear 1333, the second bevel gear 1335, the third bevel gear 1337, and the fourth bevel gear 1339 mesh head-to-tail and are all located within the limiting cavity. The first rotating shaft 1332 and the third rotating shaft 1336 are coaxially arranged, and the second rotating shaft 1334 and the fourth rotating shaft 1338 are coaxially arranged. The first rotating shaft 1332, the second rotating shaft 1334, the third rotating shaft 1336 and the fourth rotating shaft 1338 are all rotatably engaged with the housing 1331. The housing 1331 can simultaneously limit the first rotating shaft 1332, the second rotating shaft 1334, the third rotating shaft 1336 and the fourth rotating shaft 1338. Specifically, the first rotating shaft 1332 is connected to the first impeller 132, and the third rotating shaft 1336 is connected to the second impeller 134. The first impeller 132 can rotate under the drive of the driving member 131, thereby driving the first rotating shaft 1332 to rotate. The first rotating shaft 1332 drives the second bevel gear 1335 and the fourth bevel gear 1339 to rotate simultaneously through the first bevel gear 1333. The second bevel gear 1335 and the fourth bevel gear 1339 both drive the third bevel gear 1337 to rotate, thereby driving the second impeller 134 to rotate through the third rotating shaft 1336, so that the first impeller 132 and the second impeller 134 rotate in opposite directions.

[0041] Please refer to Figure 4 Optionally, the counter-rotating air outlet device 130 further includes a drive cover 135. The drive cover 135 includes a cover cylinder 1351 and a second sound-absorbing cylinder 1352. The cover cylinder 1351 is disposed inside the second sound-absorbing cylinder 1352 and forms a second sound-absorbing cavity 1353 between the cover cylinder 1351 and the second sound-absorbing cylinder 1352. The second sound-absorbing cylinder 1352 is densely provided with a plurality of second sound-absorbing holes 1355, which communicate with the second sound-absorbing cavity 1353. The drive component 131 is disposed inside the cover cylinder 1351. Specifically, during the operation of the counter-rotating air outlet device 130, the airflow flows between the first sound-absorbing cylinder 120 and the second sound-absorbing cylinder 1352 and generates noise. During this process, the plurality of first sound-absorbing holes 121 absorb the noise into the first sound-absorbing cavity 150, and the plurality of second sound-absorbing holes 1355 absorb the noise into the second sound-absorbing cavity 1353, thereby improving the noise reduction effect.

[0042] In this embodiment, the drive cover 135 also includes a plurality of spacers 1354. The plurality of spacers 1354 are arranged parallel to each other along the air outlet direction and are all disposed within the second sound-absorbing cavity 1353 to divide the second sound-absorbing cavity 1353 into a plurality of sub-sound-absorbing cavities (not shown in the figure). The plurality of spacers 1354 work together to guide noise in segments to the plurality of sub-sound-absorbing cavities during the sound absorption process, thereby further improving the noise reduction effect.

[0043] Please refer to Figure 5 It is worth noting that a first partition 151 is provided inside the first sound-absorbing cavity 150. The first partition 151 extends along the air outlet direction, with its first end connected to the first end wall of the first sound-absorbing cavity 150 along the air outlet direction, and its second end spaced apart from the second end wall of the first sound-absorbing cavity 150 along the air outlet direction. Specifically, the first partition 151 is disposed between the air guide duct 110 and the first sound-absorbing cylinder 120, and is parallel to both the air guide duct 110 and the first sound-absorbing cylinder 120. The first partition 151 divides the first sound-absorbing cavity 150 into a U-shape, so that the extension path inside the first sound-absorbing cavity 150 is U-shaped, significantly extending the effective sound absorption path inside the first sound-absorbing cavity 150, allowing the first sound-absorbing cavity 150 to continuously absorb noise along its extension path, achieving a good noise reduction effect.

[0044] Furthermore, a second partition 152 is also provided inside the first sound-absorbing cavity 150. The second partition 152 extends along the air outlet direction, with its first end connected to a second end wall along the air outlet direction, and its second end spaced apart from the first end wall along the air outlet direction. Specifically, the second partition 152 is disposed between the air guide duct 110 and the first sound-absorbing cylinder 120, and is parallel to both the air guide duct 110 and the first sound-absorbing cylinder 120. The second partition 152 and the first partition 151 are parallel and spaced apart. The second partition 152 and the first partition 151 work together to divide the first sound-absorbing cavity 150 into an S-shape, so that the extension path inside the first sound-absorbing cavity 150 is arranged in an S-shape, further extending the effective sound absorption path inside the first sound-absorbing cavity 150, thereby further improving the noise reduction effect.

[0045] Optionally, there are multiple first partitions 151 and multiple second partitions 152. By setting multiple first partitions 151 and multiple second partitions 152, the effective sound absorption path in the first sound absorption cavity 150 can be further extended to ensure the noise reduction effect.

[0046] Optionally, the distance between the first partition 151 and the second partition 152 is 10mm-20mm, that is, the height of the extension path inside the first sound-absorbing cavity 150 is 10mm-20mm. A reasonable distance between the first partition 151 and the second partition 152 can ensure that noise propagates forward along the extension path and improve the sound absorption effect of the first sound-absorbing cavity 150.

[0047] Optionally, the distance between the first partition 151 and the second end wall is 30mm-50mm; the distance between the second partition 152 and the first end wall is 30mm-50mm; reasonable distances between the first partition 151 and the second end wall and between the second partition 152 and the first end wall can ensure the propagation effect of noise at the bend of the extension path, and further improve the sound absorption effect of the first sound-absorbing cavity 150.

[0048] Optionally, the ratio of the sum of the areas of the plurality of first sound-absorbing holes 121 to the surface area of ​​the first sound-absorbing cylinder 120 is 4%-5%. A reasonable ratio of the sum of the areas of the plurality of first sound-absorbing holes 121 to the surface area of ​​the first sound-absorbing cylinder 120 can improve the sound absorption effect of the first sound-absorbing cylinder 120 and ensure the noise reduction effect.

[0049] Optionally, the diameter of the first sound-absorbing hole 121 is 1.5mm-2.0mm. A reasonable diameter of the first sound-absorbing hole 121 can improve the sound absorption effect of the first sound-absorbing cylinder 120 and ensure the noise reduction effect.

[0050] It is worth noting that the air duct 110 includes a first end plate 113, a main air section 114, a second end plate 115, an air guide section 116, and a third end plate 117 connected in sequence; the first sound-absorbing tube 120 includes a first sound-absorbing section 122 and a second sound-absorbing section 123 connected to each other; the first sound-absorbing cavity 150 includes a first cavity section 153 and a second cavity section 154. A counter-rotating air outlet device 130 is disposed within the first sound-absorbing section 122, which is disposed within the main air section 114 and simultaneously connected to the first end plate 113 and the second end plate 115 to form the first cavity section 153. The second sound-absorbing section 123 is disposed within the air guide section 116 and simultaneously connected to the second end plate 115 and the third end plate 117 to form the second cavity section 154. The first sound-absorbing section 122 and the main air section 114 are both cylindrical, while the second sound-absorbing section 123 and the air-guiding section 116 are both conical. The diameters of the second sound-absorbing section 123 and the air-guiding section 116 gradually decrease along the air outlet direction. The air outlet flows from the first sound-absorbing section 122 to the second sound-absorbing section 123 and then flows outward. During this process, the first sound-absorbing section 122 can absorb and reduce the noise generated by the air outlet through the first sound-absorbing hole 121 provided on it. The second sound-absorbing section 123 can absorb and reduce the noise generated by the air outlet through the first sound-absorbing hole 121 provided on it, and can also pressurize the air outlet through the tapered structure to increase the air outlet velocity, thereby increasing the water mist blowing distance.

[0051] In this embodiment, a partition plate 157 is provided in the first cavity 153. The position of the partition plate 157 corresponds to the position of the first impeller 132. The partition plate 157 is used to divide the first cavity 153 into two halves along the air outlet direction, so as to guide the noise to the two halves of the first cavity 153 in segments during the sound absorption process, thereby further improving the noise reduction effect.

[0052] Furthermore, the air duct 110 also includes a fourth end plate 118 and an air inlet section 119; the first sound-absorbing tube 120 also includes a third sound-absorbing section 124; and the first sound-absorbing cavity 150 also includes a third cavity section 155. The fourth end plate 118 is connected to the first end plate 113 through the air inlet section 119, and the third sound-absorbing section 124 is disposed in the air inlet section 119 and is simultaneously connected to the fourth end plate 118 and the first end plate 113 to form the third cavity section 155. The third sound-absorbing section 124 and the air inlet section 119 are both cone-shaped. The diameters of the third sound-absorbing section 124 and the air inlet section 119 gradually decrease along the air outlet direction. The air outlet is introduced into the first sound-absorbing section 122 from the third sound-absorbing section 124. In this process, the third sound-absorbing section 124 can absorb and reduce the noise generated by the air outlet through the first sound-absorbing hole 121 set on it. On the other hand, it can pressurize the air outlet through the tapered structure, increase the flow rate of the air outlet, and thus increase the air intake volume.

[0053] Please refer to the reference. Figure 6 and Figure 7 Optionally, the noise-reducing counter-rotating mist cannon 100 also includes a noise-reducing guide cone 160. The noise-reducing guide cone 160 is disposed within the air guide duct 110 and located between the counter-rotating air outlet device 130 and the spray device 140. The noise-reducing guide cone 160 includes a noise-reducing plate 161 and a third sound-absorbing cylinder 162. The third sound-absorbing cylinder 162 extends along the air outlet direction, and the noise-reducing plate 161 is connected inside the third sound-absorbing cylinder 162. The third sound-absorbing cylinder 162 is densely provided with a plurality of third sound-absorbing holes 163. Specifically, the third sound-absorbing cylinder 162 is located on the side of the second impeller 134 away from the first impeller 132, and is coaxially arranged with the second impeller 134 and the first impeller 132. The third sound-absorbing cylinder 162 is conical in shape, and its diameter gradually decreases along the air outlet direction. The air outlet flows in the air guide duct 110 along the air outlet direction. During this process, the third sound-absorbing cylinder 162 can guide the air outlet to ensure that the air outlet flows stably along the axial direction of the third sound-absorbing cylinder 162. On the other hand, it can absorb and reduce the noise generated by the air outlet through the third sound-absorbing hole 163. The noise reduction plate 161 inside the third sound-absorbing cylinder 162 can absorb the noise entering the third sound-absorbing cylinder 162 through the third sound-absorbing hole 163, so as to further improve the noise reduction effect.

[0054] Optionally, the ratio of the sum of the areas of the multiple third sound-absorbing holes 163 to the surface area of ​​the third sound-absorbing cylinder 162 is 1.5%-4%. A reasonable ratio of the sum of the areas of the multiple third sound-absorbing holes 163 to the surface area of ​​the third sound-absorbing cylinder 162 can improve the sound absorption effect of the third sound-absorbing cylinder 162 and ensure the noise reduction effect.

[0055] Optionally, the diameter of the third sound-absorbing hole 163 is 1mm-1.5mm. A reasonable diameter of the third sound-absorbing hole 163 can improve the sound absorption effect of the third sound-absorbing cylinder 162 and ensure the noise reduction effect.

[0056] In this embodiment, the noise reduction plate 161 is arranged in a spiral shape with the axis of the third sound-absorbing cylinder 162 as the center, so as to divide the inner cavity of the third sound-absorbing cylinder 162 into a spiral extension path. After the third sound-absorbing hole 163 absorbs the noise into the third sound-absorbing cylinder 162, the noise can be absorbed along the spiral extension path, extending the effective sound absorption path in the third sound-absorbing cylinder 162 and improving the noise reduction effect.

[0057] Furthermore, the noise-reducing guide cone 160 also includes multiple partition plates 164, and the number of noise-reducing plates 161 is also multiple. The multiple partition plates 164 are all disposed within the third sound-absorbing cylinder 162, and are arranged parallel to each other along the axial direction of the third sound-absorbing cylinder 162. The multiple partition plates 164 divide the inner cavity of the third sound-absorbing cylinder 162 into multiple segments. Each noise-reducing plate 161 is disposed within one segment of the inner cavity. The multiple partition plates 164 work together to guide noise into multiple segments of the inner cavity during the sound absorption process, further improving the noise reduction effect.

[0058] It is worth noting that, in order to verify the performance of the noise-reducing counter-rotating fog cannon 100 of this application, a comparative simulation test was conducted on five schemes, and the data in the table below were obtained. Among them, in Scheme 1, the distance between the first impeller 132 and the second impeller 134 is 500mm; in Scheme 2, the distance between the first impeller 132 and the second impeller 134 is 600mm; in Scheme 3, the distance between the first impeller 132 and the second impeller 134 is 650mm; in Scheme 4, the distance between the first impeller 132 and the second impeller 134 is 700mm; and Scheme 5 uses a single impeller for air outlet and does not have impeller spacing.

[0059]

[0060] As shown in the table above, when a dual-impeller air outlet is used, and the distance between the first impeller 132 and the second impeller 134 is 600mm-650mm, the maximum water mist blowing distance can be achieved with the minimum driving power of the drive component 131 and the minimum rotation speed of the first impeller 132 and the second impeller 134, while generating the minimum noise.

[0061] Furthermore, to further verify the performance of the noise-reducing counter-rotating fog cannon 100 of this application, a comparative simulation test was conducted on five schemes (the ratio of the sum of the areas of multiple first sound-absorbing holes 121 to the surface area of ​​the first sound-absorbing cylinder 120 is the perforation rate), and the data in the table below were obtained. Among them, the aperture of the first sound-absorbing hole 121 in scheme 6 is 1.6 mm, the aperture of the first sound-absorbing hole 121 in scheme 7 is 1.8 mm, the aperture of the first sound-absorbing hole 121 in scheme 8 is 2.0 mm, the aperture of the first sound-absorbing hole 121 in scheme 9 is 2.2 mm, and the aperture of the first sound-absorbing hole 121 in scheme 10 is 2.5 mm.

[0062]

[0063] As shown in the table above, the noise generated is minimal when the diameter of the first sound-absorbing hole 121 is 1.8mm-2.0mm.

[0064] Furthermore, to further verify the performance of the noise-reducing counter-rotating fog cannon 100 of this application, a comparative simulation test was conducted on five schemes (the ratio of the sum of the areas of the multiple first sound-absorbing holes 121 to the surface area of ​​the first sound-absorbing cylinder 120 is the perforation rate), and the data in the table below were obtained. Among them, the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 in scheme 11 is 0.6%, the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 in scheme 12 is 0.8%, the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 in scheme 13 is 1.0%, the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 in scheme 14 is 1.2%, and the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 in scheme 15 is 1.4%.

[0065]

[0066] As shown in the table above, the noise generated is minimal when the perforation rate of the first sound-absorbing hole 121 on the first sound-absorbing cylinder 120 is 0.8%-1.0%.

[0067] The noise-reducing counter-rotating fog cannon 100 provided in this embodiment of the invention has a first sound-absorbing cylinder 120 disposed inside an air guide duct 110, forming a first sound-absorbing cavity 150 between the cylinder and the air guide duct 110. The first sound-absorbing cylinder 120 is densely provided with a plurality of first sound-absorbing holes 121, which communicate with the first sound-absorbing cavity 150. A counter-rotating air outlet device 130 is installed inside the first sound-absorbing cylinder 120, and a spray device 140 is installed at the air outlet end 112 of the air guide duct 110. The counter-rotating air outlet device 130 includes a driving member 131, a first impeller 132, a reverse transmission assembly 133, and a second impeller 134. The driving member 131 is connected to the first impeller 132, and the reverse transmission assembly 133 is connected between the first impeller 132 and the second impeller 134. The first impeller 132 and the second impeller 134 are coaxially arranged, and the driving member 131 is used to drive the first impeller 132 and the second impeller 134 to rotate in opposite directions. Compared with the prior art, the noise-reducing counter-rotating mist cannon 100 provided by the present invention adopts a first sound-absorbing cylinder 120 that forms a first sound-absorbing cavity 150 with the air guide duct 110 and is densely provided with a plurality of first sound-absorbing holes 121, as well as a first impeller 132 and a second impeller 134 connected by a reverse transmission assembly 133. Therefore, it can achieve long-distance water mist blowing, meet the operational needs of different scenarios, and effectively reduce noise and reduce noise pollution.

[0068] Second Embodiment Please refer to the reference. Figure 8 and Figure 9This invention provides a noise-reducing counter-rotating fog cannon 100. Compared with the first embodiment, the difference in this embodiment is that the first sound-absorbing cavity 150 is no longer provided with a first partition 151 and a second partition 152, but is provided with multiple partitions 156, and the shape and number of noise-reducing plates 161 are different.

[0069] In this embodiment, a plurality of partitions 156 are provided in the first sound-absorbing cavity 150. The partitions 156 are arranged parallel to each other along the air outlet direction to divide the first sound-absorbing cavity 150 into a plurality of sub-sound-absorbing cavities (not shown in the figure). The partitions 156 work together to guide the noise to the plurality of sub-sound-absorbing cavities in segments during the sound absorption process, thereby further improving the noise reduction effect.

[0070] In this embodiment, there are multiple noise reduction plates 161 arranged radially around the axis of the third sound-absorbing cylinder 162. One end of each noise reduction plate 161 is connected to the other end at the axis of the third sound-absorbing cylinder 162, and the other end is connected to the inner wall of the third sound-absorbing cylinder 162. The multiple noise reduction plates 161 work together to isolate noise during the sound absorption process, prevent noise from penetrating the third sound-absorbing cylinder 162 and overflowing outward, and further improve the noise reduction effect.

[0071] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A noise-reducing counter-rotating fog cannon, characterized in that, The device includes an air guide tube (110), a first sound-absorbing tube (120), a counter-rotating air outlet device (130), and a spray device (140). The first sound-absorbing tube (120) is disposed inside the air guide tube (110) and forms a first sound-absorbing cavity (150) with the air guide tube (110). The first sound-absorbing tube (120) is densely provided with a plurality of first sound-absorbing holes (121), and the first sound-absorbing holes (121) are connected to the first sound-absorbing cavity (150). The counter-rotating air outlet device (130) is installed inside the first sound-absorbing tube (120), and the spray device (140) is installed at the air outlet end (112) of the air guide tube (110). The counter-rotating air outlet device (130) includes a driving component (131), a first impeller (132), a reverse transmission assembly (133), and a second impeller (134). The driving component (131) is connected to the first impeller (132), and the reverse transmission assembly (133) is connected between the first impeller (132) and the second impeller (134). The first impeller (132) and the second impeller (134) are coaxially arranged. The driving component (131) is used to drive the first impeller (132) and the second impeller (134) to rotate in opposite directions.

2. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The blades of the first impeller (132) and the second impeller (134) are arranged in a mirror-symmetrical manner; And / or, the distance between the first impeller (132) and the second impeller (134) is 600mm-650mm; And / or, the inlet angle of the first impeller (132) is 4°-5° larger than the inlet angle of the second impeller (134).

3. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The reverse transmission assembly (133) includes a housing (1331), a first rotating shaft (1332), a first bevel gear (1333) sleeved on the first rotating shaft (1332), a second rotating shaft (1334), a second bevel gear (1335) sleeved on the second rotating shaft (1334), a third rotating shaft (1336), a third bevel gear (1337) sleeved on the third rotating shaft (1336), a fourth rotating shaft (1338), and a fourth bevel gear (1339) sleeved on the fourth rotating shaft (1338). A limiting cavity is provided inside the housing (1331). The first bevel gear (1333) and the second bevel gear (1335)... The third bevel gear (1337) and the fourth bevel gear (1339) mesh head-to-tail and are both located in the limiting cavity. The first rotating shaft (1332) and the third rotating shaft (1336) are coaxially arranged, and the second rotating shaft (1334) and the fourth rotating shaft (1338) are coaxially arranged. The first rotating shaft (1332), the second rotating shaft (1334), the third rotating shaft (1336) and the fourth rotating shaft (1338) are all rotatably engaged with the housing (1331). The first rotating shaft (1332) is connected to the first impeller (132), and the third rotating shaft (1336) is connected to the second impeller (134).

4. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The counter-rotating air outlet device (130) further includes a drive cover (135), which includes a cover cylinder (1351) and a second sound-absorbing cylinder (1352). The cover cylinder (1351) is disposed inside the second sound-absorbing cylinder (1352) and forms a second sound-absorbing cavity (1353) between the cover cylinder (1351) and the second sound-absorbing cylinder (1352). The second sound-absorbing cylinder (1352) is densely provided with a plurality of second sound-absorbing holes (1355). The second sound-absorbing holes (1355) communicate with the second sound-absorbing cavity (1353). The drive component (131) is disposed inside the cover cylinder (1351).

5. The noise-reducing counter-rotating fog cannon according to claim 4, characterized in that, The drive cover (135) also includes a plurality of partitions (1354), which are arranged parallel to each other along the air outlet direction and are all disposed in the second sound-absorbing cavity (1353) to divide the second sound-absorbing cavity (1353) into a plurality of sub-sound-absorbing cavities.

6. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, A first partition (151) is provided inside the first sound-absorbing cavity (150). The first partition (151) extends along the air outlet direction. The first end of the first partition (151) along the air outlet direction is connected to the first end wall of the first sound-absorbing cavity (150). The second end of the first partition (151) along the air outlet direction is spaced apart from the second end wall of the first sound-absorbing cavity (150).

7. The noise-reducing counter-rotating fog cannon according to claim 6, characterized in that, The first sound-absorbing cavity (150) is also provided with a second partition (152), which extends along the air outlet direction. The first end of the second partition (152) along the air outlet direction is connected to the second end wall, and the second end of the second partition (152) along the air outlet direction is spaced apart from the first end wall.

8. The noise-reducing counter-rotating fog cannon according to claim 7, characterized in that, The distance between the first partition (151) and the second partition (152) is 10mm-20mm; And / or, the distance between the first partition (151) and the second end wall is 30mm-50mm; And / or, the distance between the second partition (152) and the first end wall is 30mm-50mm.

9. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The first sound-absorbing cavity (150) is provided with a plurality of partitions (156), which are arranged parallel to each other along the air outlet direction to divide the first sound-absorbing cavity (150) into a plurality of sub-sound-absorbing cavities.

10. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The sum of the areas of the plurality of first sound-absorbing holes (121) is 4%-5% of the surface area of ​​the first sound-absorbing tube (120); And / or, the diameter of the first sound-absorbing hole (121) is 1.5mm-2.0mm.

11. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The air guide tube (110) includes a first end plate (113), a main air section (114), a second end plate (115), an air guide section (116), and a third end plate (117) connected in sequence. The first sound-absorbing tube (120) includes a first sound-absorbing section (122) and a second sound-absorbing section (123) connected to each other. The first sound-absorbing cavity (150) includes a first cavity section (153) and a second cavity section (154). The counter-rotating air outlet device (130) is disposed in the first sound-absorbing section (122). The first cavity section (153) is located within the main air section (114) and is simultaneously connected to the first end plate (113) and the second end plate (115). The second sound-absorbing section (123) is located within the air guide section (116) and is simultaneously connected to the second end plate (115) and the third end plate (117) to form the second cavity section (154). The first sound-absorbing section (122) and the main air section (114) are both cylindrical, and the second sound-absorbing section (123) and the air guide section (116) are both conical.

12. The noise-reducing counter-rotating fog cannon according to claim 11, characterized in that, The air duct (110) further includes a fourth end plate (118) and an air inlet section (119). The first sound-absorbing tube (120) further includes a third sound-absorbing section (124). The first sound-absorbing cavity (150) further includes a third cavity section (155). The fourth end plate (118) is connected to the first end plate (113) through the air inlet section (119). The third sound-absorbing section (124) is disposed in the air inlet section (119) and is connected to both the fourth end plate (118) and the first end plate (113) to form the third cavity section (155). The third sound-absorbing section (124) and the air inlet section (119) are both conical.

13. The noise-reducing counter-rotating fog cannon according to claim 1, characterized in that, The noise-reducing counter-rotating fog cannon also includes a noise-reducing guide cone (160), which is disposed inside the air guide tube (110) and located between the counter-rotating air outlet device (130) and the spray device (140). The noise-reducing guide cone (160) includes a noise-reducing plate (161) and a third sound-absorbing tube (162). The third sound-absorbing tube (162) extends along the air outlet direction. The noise-reducing plate (161) is connected inside the third sound-absorbing tube (162). The third sound-absorbing tube (162) is densely provided with a plurality of third sound-absorbing holes (163).

14. The noise-reducing counter-rotating fog cannon according to claim 13, characterized in that, The sum of the areas of the plurality of third sound-absorbing holes (163) is 1.5%-4% of the surface area of ​​the third sound-absorbing tube (162); And / or, the diameter of the third sound-absorbing hole (163) is 1mm-1.5mm.

15. The noise-reducing counter-rotating fog cannon according to claim 13, characterized in that, The noise reduction plate (161) is arranged in a spiral shape with the axis of the third sound-absorbing cylinder (162) as the center; or, there are multiple noise reduction plates (161), and the multiple noise reduction plates (161) are arranged radially with the axis of the third sound-absorbing cylinder (162) as the center.

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