Silencer pipe and ducted air conditioner having the same

Abstract

The application discloses a kind of muffler pipe and air duct machine with it, the muffler pipe includes multiple noise reduction modules, multiple the noise reduction module splicing and enclose the muffler pipe, the inside of the muffler pipe defines airflow passage, the noise reduction module has resonance cavity and the communication hole that communicates with the resonance cavity, the resonance cavity is communicated with the airflow passage by the communication hole.According to the muffler pipe of the application, by splicing and surrounding the muffler pipe using multiple noise reduction modules, the sound absorption effect of the muffler pipe can be increased, the air outlet noise of the air duct machine can be reduced, and the use experience of the air duct machine can be improved.

Description

Silencers and ducted air conditioners Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to a silencer duct and a ducted air conditioner having the same. Background Technology

[0002] Ductless air conditioners are commonly used air conditioners, but the indoor unit's fan often generates significant noise during operation. This noise includes mechanical and airflow noise, but airflow noise is far greater than mechanical noise, and the main airflow noise originates at the air outlet. Current methods for reducing noise at the outlet typically involve installing a sound-absorbing material layer to absorb the noise generated at the outlet. While this method can reduce noise to some extent, it requires structural modifications to the outlet, resulting in a complex structure and poor sound absorption. Furthermore, the wide variety of ductless air conditioner models requires different ducts, leading to poor versatility. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a silencer tube that can increase the sound absorption effect of the silencer tube, reduce the exhaust noise of the ducted air conditioner, and improve the user experience of the ducted air conditioner. Simultaneously, it allows for flexible assembly of the silencer tube by designing the number of noise reduction modules according to different models and installation spaces, thereby increasing the versatility of the silencer tube and enhancing the market competitiveness of the ducted air conditioner.

[0004] The present invention also proposes a duct air conditioner having the above-mentioned silencer pipe.

[0005] According to a first aspect of the present invention, the silencer tube includes a plurality of noise reduction modules, the plurality of noise reduction modules are spliced ​​together and surround the silencer tube, an airflow channel is defined on the inner side of the silencer tube, and the noise reduction module has a resonant cavity and a communication hole communicating with the resonant cavity, the resonant cavity communicating with the airflow channel through the communication hole.

[0006] According to the present invention, by using multiple noise reduction modules spliced ​​together and enclosing the silencer, the sound absorption effect of the silencer can be increased, the air outlet noise of the ducted air conditioner can be reduced, and thus the user experience of the ducted air conditioner can be improved. At the same time, the silencer can be flexibly assembled according to the number of noise reduction modules designed according to different models and installation spaces, thereby increasing the versatility of the silencer and improving the market competitiveness of the ducted air conditioner.

[0007] According to some embodiments of the present invention, at least a portion of the cross-sectional area of ​​the airflow channel is increased along the airflow direction of the airflow channel.

[0008] According to some embodiments of the present invention, the cross-sectional area of ​​the airflow channel first increases and then decreases along the airflow direction of the airflow channel.

[0009] According to some embodiments of the present invention, the wall of the airflow channel is formed with a cavity that is recessed radially outward.

[0010] According to some embodiments of the present invention, the silencer includes at least one noise reduction pipe segment, a plurality of noise reduction pipe segments are connected sequentially along the length direction of the silencer, at least a portion of the plurality of noise reduction modules are formed as a first module, and a plurality of first modules are connected end to end along the circumference of the silencer to form the noise reduction pipe segment.

[0011] According to some embodiments of the present invention, a portion of the plurality of noise reduction modules is formed as a second module, the second module being arranged perpendicular to the air outlet direction and connected to the periphery of the inlet of the silencer pipe to block a portion of the cross-section of the inlet of the silencer pipe.

[0012] According to some embodiments of the present invention, a portion of the plurality of noise reduction modules is formed as a third module, the third module being disposed perpendicular to the air outlet direction and connected to the periphery of the outlet of the silencer pipe to block a portion of the cross-section of the outlet of the silencer pipe.

[0013] According to some embodiments of the present invention, the cross-section of the airflow channel is rectangular, and a plane perpendicular to the length direction of the airflow channel is defined as a first plane. The first direction and the second direction within the first plane are the width direction and the height direction of the airflow channel, respectively. The third module and the second module are arranged on the same side of the airflow channel in the first direction. The second module blocks the cross-section of the inlet of the airflow channel at least one end in the first direction, and the third module blocks the cross-section of the outlet of the airflow channel at at least one end in the first direction.

[0014] According to some embodiments of the present invention, the silencer pipe satisfies:

[0015]

[0016] Where t is the transmission coefficient of the silencer tube; k is the number of wave cycles per unit length in the direction of sound wave propagation; S 12 S is the cross-sectional area of ​​the inlet of the airflow channel. 21 L1 is the cross-sectional area of ​​the airflow channel excluding the inlet and outlet; L2 is the distance between the second module and the third module.

[0017] According to some embodiments of the present invention, in the length direction of the silencer, the distance between the second module and the third module is 1 / 4 of the sound wave wavelength.

[0018] According to some embodiments of the present invention, a portion of the plurality of noise reduction modules is formed as a fourth module, the fourth module being arranged parallel to the length direction of the silencer, the plurality of fourth modules being disposed within the silencer and dividing the airflow channel into a plurality of sub-channels, the plurality of sub-channels being arranged in a plane perpendicular to the length direction of the silencer.

[0019] According to some embodiments of the present invention, among the plurality of fourth modules, the fourth module disposed at the inlet position of the airflow channel has a windward surface, the windward surface being disposed away from the inlet of the airflow channel, and the windward surface being an arc surface away from the outlet protrusion.

[0020] According to some embodiments of the present invention, the noise reduction module includes: an outer plate portion, an inner plate portion, and a partition portion, wherein the outer plate portion and the inner plate portion are arranged at intervals along the thickness direction of the noise reduction module, the partition portion is connected between the outer plate portion and the inner plate portion, and divides the space between the outer plate portion and the inner plate portion into a plurality of resonant cavities, and the connecting hole is formed on the inner plate portion.

[0021] According to some embodiments of the present invention, multiple noise reduction modules are detachably connected.

[0022] According to some embodiments of the present invention, the noise reduction module further includes: an extension tube, the extension tube being connected to the periphery of the communicating hole and extending along the central axis of the communicating hole, the extension tube being disposed within the resonant cavity.

[0023] According to some embodiments of the present invention, each of the noise reduction modules has a plurality of the resonant cavities, and each of the resonant cavities is connected to the airflow channel through at least one of the connecting holes.

[0024] According to some embodiments of the present invention, the number of connecting holes in at least two of the resonant cavities in each of the noise reduction modules is different.

[0025] According to a second aspect of the present invention, a ducted air conditioner includes a main body and a silencer pipe according to a first aspect of the present invention, the main body having an air inlet and an air outlet; the silencer pipe is connected to the air inlet and / or the air outlet.

[0026] According to the ductwork machine of the present invention, by providing the silencer pipe described in the first aspect, the overall performance of the ductwork machine is improved.

[0027] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 is a schematic diagram of a ductwork machine according to an embodiment of the present invention;

[0029] Figure 2 is an exploded view of a ductwork machine according to an embodiment of the present invention;

[0030] Figure 3 is a partial exploded view of the ductwork unit according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a silencer pipe according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of the silencer pipe from another angle according to an embodiment of the present invention;

[0033] Figure 6 is a cross-sectional view along line AA shown in Figure 5;

[0034] Figure 7 is a cross-sectional view of the silencer pipe from another angle according to an embodiment of the present invention;

[0035] Figure 8 is a cross-sectional view of the silencer pipe from another angle according to an embodiment of the present invention;

[0036] Figure 9 is a simulation bar chart of the sound absorption and noise reduction effect of the silencer tube according to an embodiment of the present invention.

[0037] Figure label:

[0038] 100. Ductless air conditioner;

[0039] 10. Main unit; 11. Air outlet;

[0040] 20. Silencer; 21. Airflow channel; 22. Noise reduction module; 221. First module; 222. Second module; 223. Third module; 224. Fourth module; 23. Noise reduction pipe section; 24. Resonance cavity; 25. Connecting hole; 26. Extension pipe;

[0041] 30. Hanging rod; 40. Bracket; 50. Locking assembly. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] First, a duct air conditioner 100 according to a second aspect embodiment of the present invention will be briefly described with reference to Figures 1-3. The duct air conditioner 100 includes a silencer duct 20 according to a first aspect embodiment of the present invention.

[0044] As shown in Figures 1-3, the ducted air conditioner 100 according to the second aspect of the present invention includes a main body 10 and a silencer duct 20 according to the first aspect of the present invention. The main body 10 has an air inlet and an air outlet 11; the silencer duct 20 is connected to the air inlet and / or the air outlet 11. That is, the silencer duct 20 can be connected to the air inlet of the main body 10, or to the air outlet 11 of the main body 10, or both.

[0045] The silencer 20 according to a first aspect of the present invention will now be described with reference to Figures 4-9.

[0046] As shown in Figures 4 and 8, according to the first aspect of the present invention, the silencer 20 includes a plurality of noise reduction modules 22, which are spliced ​​together and enclose the silencer 20. An airflow channel 21 is defined on the inner side of the silencer 20. The noise reduction module 22 has a resonant cavity 24 and a connecting hole 25 communicating with the resonant cavity 24. The resonant cavity 24 is connected to the airflow channel 21 through the connecting hole 25.

[0047] Specifically, the main unit 10 can process outdoor air and drive the processed outdoor air into the room to provide fresh air to the room; the silencer duct 20 can guide the airflow to the room or the main unit 10 for processing; at the same time, since the silencer duct 20 also includes multiple noise reduction modules 22, the silencer duct 20 can also absorb and reduce the noise of the air outlet or inlet of the main unit 10, reduce the airflow noise generated by the duct air conditioner 100, and further improve the user's comfort.

[0048] When the airflow enters the airflow channel 21, the sound waves generated by the airflow can enter the resonant cavity 24 through the connecting hole 25. In the resonant cavity 24, the sound waves will drive the air inside the resonator to vibrate. When the air vibrates, it will rub against the inner wall of the resonant cavity 24, thereby converting the energy of the sound waves into heat energy, thus reducing the energy of the sound waves and achieving the effect of sound absorption and noise reduction. When the natural frequency of the resonant cavity 24 is the same as the frequency of the sound waves, the sound waves will resonate with the air inside the resonant cavity 24, and the degree to which the sound waves drive the air to vibrate is the greatest. At this time, the degree to which the energy of the sound waves is converted into heat is the highest, that is, the sound absorption and noise reduction effect of the resonant cavity 24 is the best.

[0049] The noise reduction module 22 includes multiple modules, such as two, three or more. Multiple noise reduction modules 22 are spliced ​​together to form a silencer duct 20. The number of noise reduction modules 22 can be designed according to different models and installation spaces to flexibly assemble the silencer duct 20, thereby increasing the versatility of the silencer duct 20 and improving the market competitiveness of the duct air conditioner 100. At the same time, multiple noise reduction modules 22 can also increase the sound absorption effect, thereby increasing the noise reduction effect of the silencer duct 20, reducing the air outlet noise of the duct air conditioner 100, and improving the user experience.

[0050] According to an embodiment of the present invention, the ducted air conditioner 100, by splicing and enclosing multiple noise reduction modules 22 to form a silencer 20, can increase the sound absorption effect of the silencer 20, reduce the air outlet noise of the ducted air conditioner 100, and thus improve the user experience of the ducted air conditioner 100; at the same time, it can also make the silencer 20 flexibly assembled according to different models and installation spaces by designing the number of noise reduction modules 22, thereby increasing the versatility of the silencer 20 and improving the market competitiveness of the ducted air conditioner 100.

[0051] According to some embodiments of the present invention, at least a portion of the cross-sectional area of ​​the airflow channel 21 is increased along the airflow direction of the airflow channel 21. That is, the cross-sectional area of ​​the airflow channel 21 can be partially increased or the entire cross-sectional area can be increased along the airflow direction of the airflow channel 21. In this way, noise can be reduced while wind resistance can be reduced, and the air outlet effect of the silencer 20 can be improved.

[0052] According to some embodiments of the present invention, as shown in Figures 6 and 7, the cross-sectional area of ​​the airflow channel 21 first increases and then decreases along the airflow direction. In this way, the airflow channel 21 can reflect part of the sound waves in the airflow direction, and then perform secondary resonance and sound absorption through the resonant cavity 24, thereby further reducing noise.

[0053] According to some embodiments of the present invention, the wall of the airflow channel 21 is formed with a cavity that is recessed radially outward. In this way, when sound waves enter the cavity, they can undergo multiple reflections and resonances, thereby forming multiple reflections and attenuation waves, which can further reduce noise and improve the sound absorption effect.

[0054] According to some embodiments of the present invention, as shown in FIG6, the silencer 20 includes at least one noise-reducing pipe segment 23, and multiple noise-reducing pipe segments 23 are connected sequentially along the length direction of the silencer 20. At least a portion of the multiple noise-reducing modules 22 are formed as first modules 221, and multiple first modules 221 are connected end to end along the circumference of the silencer 20 to form the noise-reducing pipe segment 23. For example, the number of first modules 221 can be two, three or more, and the number of noise-reducing pipe segments 23 can be one, two, three or more. An airflow channel 21 is formed inside the noise-reducing pipe segment 23, and the multiple first modules 221 are connected end to end to form an annular noise-reducing pipe segment 23. The annular noise-reducing pipe segment 23 can absorb sound waves in multiple directions in the circumference, thereby increasing the sound absorption effect of the noise-reducing pipe segment 23.

[0055] It should be noted that in this embodiment, the cross-sectional areas of the multiple noise reduction tube segments 23 can be different, and the number of noise reduction tube segments 23 can be designed according to different modes, which can increase the applicability of the silencer tube 20.

[0056] According to some embodiments of the present invention, as shown in FIG6, a portion of the plurality of noise reduction modules 22 is formed as a second module 222. The second module 222 is arranged perpendicular to the air outlet direction and connected to the periphery of the inlet of the silencer duct 20 to block a portion of the inlet cross-section of the silencer duct 20. The second module 222 can increase the contact area between the silencer duct 20 and the main body 10, thereby increasing the tightness of the connection between the silencer duct 20 and the main body 10. This effectively prevents airflow leakage from the gap between the silencer duct 20 and the main body 10, thus ensuring the air outlet effect of the duct air conditioner 100.

[0057] Furthermore, the inlet of the silencer duct 20 is the same size as the air outlet 11 of the main body 10. This can avoid noise caused by increased gas flow rate, and at the same time, ensure the air outlet effect of the duct unit 100.

[0058] According to some embodiments of the present invention, as shown in FIG7, a portion of the plurality of noise reduction modules 22 is formed as a third module 223. The third module 223 is arranged perpendicular to the air outlet direction and connected to the periphery of the outlet of the silencer duct 20 to block a portion of the cross-section of the outlet of the silencer duct 20. In this way, the third module 223 can block and reflect part of the sound waves of the airflow entering the airflow channel 21, thereby changing the propagation path and speed of the sound waves. This allows the sound waves to undergo multiple reflections and absorptions in the airflow channel 21, thereby further reducing noise.

[0059] Furthermore, the outlet of the silencer 20 is consistent with the size of the air outlet 11 of the main body 10, which can ensure the air outlet effect of the duct air conditioner 100; at the same time, it can also effectively avoid the noise caused by the increased flow velocity due to the narrowing of the airflow after sound absorption.

[0060] According to some embodiments of the present invention, as shown in Figures 6 and 7, the cross-section of the airflow channel 21 is rectangular. A plane perpendicular to the length direction of the airflow channel 21 is defined as a first plane. The first direction (e.g., the left-right direction shown in Figure 7) and the second direction (e.g., the up-down direction shown in Figure 7) within the first plane are the width direction and the height direction of the airflow channel 21, respectively. Specifically, the rectangular structure is simple and adaptable to the air outlet 11 of the main body 10, thereby improving the assembly convenience and space ratio of the silencer 20. At the same time, it can also increase the airflow smoothness of the duct unit 100 and ensure the airflow effect of the duct unit 100.

[0061] In this configuration, the third module 223 and the second module 222 are arranged on the same side of the airflow channel 21 in the first direction. The second module 222 blocks at least one end of the inlet of the airflow channel 21 in the first direction, and the third module 223 blocks at least one end of the outlet of the airflow channel 21 in the first direction. That is, the second module 222 can block only one end of the inlet of the airflow channel 21 in the first direction, or it can block both ends of the inlet of the airflow channel 21 in the first direction; similarly, the third module 223 can block only one end of the outlet of the airflow channel 21 in the first direction, or it can block both ends of the outlet of the airflow channel 21 in the first direction.

[0062] For example, as shown in Figure 6, the second module 222 and the third module 223 are arranged facing each other in the front-back direction of the airflow channel 21. The second module 222, the third module 223 and the first module 221 are connected to form a U-shaped groove, and the second module 222 and the third module 223 are both arranged at both ends in the first direction, forming U-shaped grooves at both ends of the air outlet 11. The inlet of the airflow channel 21, which is defined between the two second modules 222, has the same width as the width of the air outlet 11 of the main body 10. The outlet of the airflow channel 21, which is defined between the two third modules 223, also has the same width as the width of the air outlet 11.

[0063] According to some embodiments of the present invention, the silencer 20 satisfies:

[0064]

[0065] Where t is the transmission coefficient of the silencer tube 20; k is the number of wave cycles per unit length in the direction of sound wave propagation; S 12 S is the cross-sectional area of ​​the inlet of airflow channel 21. 21 L1 is the cross-sectional area of ​​the airflow channel 21 excluding the inlet and outlet; L2 is the distance between the second module 222 and the third module 223.

[0066] Specifically, when noise emitted by a sound source propagates in a medium, its sound pressure or intensity gradually decreases as the propagation distance increases. Consequently, as the distance between the second module 222 and the third module 223 increases, the noise can decrease relatively. t is the transmission coefficient of the silencer 20; the smaller the transmission coefficient, the lower the sound wave penetration rate, and thus the higher the sound absorption effect.

[0067] For example, as shown in Figures 6 and 7. , Where L1 is the width of the airflow channel 21, L3 is the height of the airflow channel 21, and L4 is the width of the air outlet 11.

[0068] According to some embodiments of the present invention, the distance between the second module 222 and the third module 223 along the length of the silencer 20 is 1 / 4 of the sound wave wavelength. Calculations show that when L2 equals 1 / 4 of the sound wave wavelength, the projection coefficient is minimized, resulting in the lowest sound wave transmittance and the lowest noise level for the duct unit 100. Therefore, by ensuring the distance between the second module 222 and the third module 223 is 1 / 4 of the sound wave wavelength, the silencer 20 can achieve the maximum sound absorption effect.

[0069] According to some embodiments of the present invention, as shown in Figures 6 and 7, a portion of the plurality of noise reduction modules 22 is formed as a fourth module 224. The fourth module 224 is arranged parallel to the length direction of the silencer duct 20. The plurality of fourth modules 224 are disposed within the silencer duct 20 and divide the airflow channel 21 into a plurality of sub-ducts. The plurality of sub-ducts are arranged in a plane perpendicular to the length direction of the silencer duct 20. The number of fourth modules 224 can be set according to the width of the air outlet 11. The plurality of sub-ducts can increase the sound absorption effect of the silencer duct 20, thereby further reducing the noise of the duct air conditioner 100.

[0070] According to some embodiments of the present invention, as shown in FIG6, among the plurality of fourth modules 224, the fourth module 224 disposed at the inlet position of the airflow channel 21 has a windward surface, which is disposed away from the outlet of the airflow channel and is an arc surface protruding away from the outlet. The arc surface can guide the airflow entering the airflow channel 21, allowing the airflow to enter the airflow channel 21 smoothly, thereby effectively preventing the generation of eddies on the surface of the fourth module 224, and further effectively reducing noise generation.

[0071] According to some embodiments of the present invention, the noise reduction module 22 includes an outer plate, an inner plate, and a partition plate. The outer plate and the inner plate are arranged at intervals along the thickness direction of the noise reduction module 22. The partition plate is connected between the outer plate and the inner plate and divides the space between the outer plate and the inner plate into a plurality of resonant cavities 24. A connecting hole 25 is formed on the inner plate. Thus, a resonant cavity 24 is formed between the outer plate and the inner plate, and the partition plate divides the resonant cavity 24 into a plurality of individual resonant cavities 24. Different resonant cavities 24 can be configured to absorb noise of different frequencies, thereby widening the sound absorption frequency band, increasing the sound absorption effect, and reducing the air outlet noise of the duct fan 100.

[0072] According to some embodiments of the present invention, multiple noise reduction modules 22 are detachably connected. This increases the convenience of installing and disassembling the silencer 20, and also allows the silencer 20 to be flexibly assembled according to different models and installation spaces, enhancing the versatility of the silencer 20.

[0073] According to some embodiments of the present invention, as shown in FIG7, the noise reduction module 22 further includes an extension tube 26, which is connected to the periphery of the connecting hole 25 and extends along the central axis of the connecting hole 25. The extension tube 26 is disposed within the resonant cavity 24. Thus, the extension tube 26 and the resonant cavity 24 can be configured as a Helmholtz resonance noise reduction structure. Specifically, the resonant frequency of the Helmholtz resonance noise reduction structure is calculated as follows:

[0074]

[0075] in, The resonant frequency of the Helmholtz resonance silencing structure; Speed ​​of sound; Let V be the volume of the resonant cavity. The cross-sectional area of ​​extension tube 26; The length of extension tube 26.

[0076] Furthermore, the volume of the resonant cavity 24 can be changed by altering its length, height, or width. The cross-sectional area of ​​the extension tube 26 can be changed based on its length and diameter. Therefore, in product design, when the speed of sound remains constant, the natural frequency of the resonant cavity 24 can be altered by changing the length of the extension tube 26, the diameter of the connecting hole 25, and the dimensions of the resonant cavity 24. For example, the natural frequency can be changed by altering the diameter of the connecting hole 25. Length of extension tube 26 Length of resonant cavity 24 Width of resonant cavity 24 Or the height of the resonant cavity 24 One or more of the dimensions are chosen so that the natural frequency of the resonant cavity 24 meets the design requirements, and at the same time, the shape of the resonant cavity 24 meets the requirements of the arrangement space.

[0077] Optionally, the extension tube 26 extends toward the resonant cavity 24, and / or the extension tube 26 extends outward away from the main body. That is, the extension tube 26 can extend toward the resonant cavity 24, or it can extend outward away from the main body, or one end of the extension tube 26 can extend toward the resonant cavity 24 while the other end extends outward away from the main body. Thus, the extension direction of the extension tube 26 can be adjusted according to the arrangement space requirements, allowing the noise reduction device to adapt to more arrangement spaces.

[0078] Preferably, the extension tube 26 is disposed inside the resonant cavity 24, and the upper surface of the extension tube 26 is flush with the upper surface of the resonant cavity 24. This can increase the neatness of the appearance of the noise reduction module 22, and thus increase the aesthetics and assembly convenience of the silencer tube 20.

[0079] Optionally, in some embodiments of the present invention, the projection shape of the extension tube 26 on the outer plate is circular, rectangular, triangular or pentagonal. Thus, the projection shape of the extension tube 26 on the outer plate can be adjusted according to the actual situation of the arrangement space, thereby meeting more product design needs.

[0080] Optional, the speed of sound is typically 340 m / s.

[0081] According to some embodiments of the present invention, each noise reduction module 22 has multiple resonant cavities 24, and each resonant cavity 24 is connected to the airflow channel 21 through at least one connecting hole 25. For example, the number of resonant cavities 24 may include two, three or more. Each resonant cavity 24 can be connected to the airflow channel 21 through one or more connecting holes 25, so that each resonant cavity 24 can generate resonance and complete the sound absorption work. At the same time, multiple resonant cavities 24 can also increase the noise reduction effect, reduce the noise of the duct unit 100, and improve the user experience.

[0082] For example, the number of connecting holes 25 can be one, two, three or more. When the number of connecting holes 25 is low, the absorption of low-frequency sound waves is better, and when the number of connecting holes 25 is high, the absorption of high-frequency sound waves is better. Therefore, the number of connecting holes can be selected according to the frequency of the noise of the duct machine, so as to better absorb sound waves and reduce noise.

[0083] It should be noted that in this embodiment, the natural frequencies of the multiple resonant cavities 24 may not be exactly the same. In this way, the noise reduction module 22 can have a good sound absorption and noise reduction effect on sound waves of multiple frequencies. Furthermore, the resonant cavities 24 of different frequencies can also couple and resonate, thereby widening the sound absorption frequency band of the noise reduction module 22. This can achieve a greater degree of wideband absorption, significantly reduce noise, and improve the performance of the duct unit 100.

[0084] According to some embodiments of the present invention, the number of connecting holes 25 in at least two resonant cavities 24 in each noise reduction module 22 is different. This allows at least two resonant cavities 24 to have different natural frequencies, thereby widening the sound absorption bandwidth of the noise reduction module 22 and improving the sound absorption effect.

[0085] According to a second aspect of the present invention, the duct air conditioner 100 includes a silencer duct 20 according to the first aspect of the present invention described above.

[0086] According to an embodiment of the present invention, the duct air conditioner 100 improves the overall performance of the duct air conditioner 100 by providing the silencer duct 20 described in the first aspect embodiment.

[0087] For example, as shown in Figures 1-3, in some specific embodiments of the present invention, the duct unit 100 further includes a hanger 30, a bracket 40, and a locking assembly 50. The main body 10 also has a lifting lug. Specifically, the bracket 40 includes a connecting plate and a mounting plate, both of which are L-shaped. The connecting plate has a locking through hole, through which the locking assembly 50 passes to connect the connecting plate and the silencer 20. The connecting plate is connected to the side of the mounting plate near the main body, and a mounting hole is formed on the connecting plate. Fasteners pass through the mounting hole to connect the bracket 40 to the main body. In addition, the upper end of the connecting plate extends toward the main body to form an extension portion, on which a mounting groove is formed. The hanger 30 passes through the mounting groove and fits in the lifting lug for fixing the duct unit 100.

[0088] A duct air conditioner 100 according to a specific embodiment of the present invention is described below with reference to Figures 1-9.

[0089] Referring to Figure 1, the ducted air conditioner 100 includes a main body 10, a hanger 30, a bracket 40, and a silencer 20. The silencer 20 is connected to the main body 10 via the bracket 40, and the bracket 40 is connected to the main body 10 via fasteners. The main body 10 has an air outlet 11, and the silencer 20 is connected to the air outlet 11 of the main body 10. The inner side of the silencer 20 defines an airflow channel 21, and the airflow enters the airflow channel 21 through the air outlet 11 of the main body 10.

[0090] Specifically, the main body 10 also has a lifting lug, and the bracket 40 includes a connecting plate and a mounting plate. Both the connecting plate and the mounting plate are L-shaped. The connecting plate has a locking through hole, and the locking assembly 50 passes through the locking through hole to connect the connecting plate and the silencer 20. The connecting plate is connected to the side of the mounting plate near the main body. The connecting plate has a mounting hole, and the fastener passes through the mounting hole to connect the bracket 40 and the main body. In addition, the upper end of the connecting plate extends towards the main body to form an extension, and a mounting groove is formed on the extension. The hanging rod 30 passes through the mounting groove and fits in the lifting lug for fixing the duct air conditioner 100.

[0091] Specifically, the muffler 20 includes multiple noise reduction modules 22, which are spliced ​​together to form the muffler 20. Each noise reduction module 22 has a resonant cavity 24 and a connecting hole 25 that communicates with the resonant cavity 24. The resonant cavity 24 is connected to the airflow channel 21 through the connecting hole 25.

[0092] The noise reduction module 22 includes an outer plate, an inner plate, a partition plate, and an extension tube 26. The outer plate and the inner plate are spaced apart along the thickness direction of the noise reduction module 22. The partition plate connects the outer plate and the inner plate, dividing the space between them into multiple resonant cavities 24. A connecting hole 25 is formed on the inner plate. The extension tube 26 is connected to the periphery of the connecting hole 25 and extends along the central axis of the connecting hole 25. The extension tube 26 is disposed within the resonant cavity 24, and its upper end face is flush with the upper end face of the inner plate. The extension tube 26 and the resonant cavity 24 together constitute a Helmholtz resonant noise reduction structure. Multiple Helmholtz resonant noise reduction structures together construct multiple noise reduction modules 22.

[0093] In this embodiment, the silencer duct 20 is composed of 100 Helmholtz resonant silencing structures. The natural frequencies and sound absorption frequency bands of the multiple Helmholtz resonant silencing structures are different. By adjusting the position layout, the multiple resonant cavities 24 can be coupled and resonated to broaden the sound absorption frequency band, thereby allowing them to act on the peak noise frequency part of the duct machine 100 respectively.

[0094] For example, as shown in Figure 9, the sound absorption and noise reduction effect of the ducted air conditioner 100 with the aforementioned silencer 20 in this embodiment was simulated. Simultaneously, the sound absorption and noise reduction effect of the ducted air conditioner 100 without the silencer 20 in this embodiment was also simulated, and the sound absorption and noise reduction effects of the two structures of the ducted air conditioner 100 were compared. The experiment showed that the peak noise frequency of the ducted air conditioner 100 is between 300-1800Hz, thus allowing the sound absorption bandwidth of the silencer 20 to be set within this range. Furthermore, as shown in Figure 9, by incorporating the silencer 20, the sound absorption and noise reduction effect of the ducted air conditioner 100 is improved across multiple sound wave frequency bands. Moreover, within the designed frequency band of 300-1800Hz, under the same ducted air conditioner 100 profile and airflow conditions, using the silencer 20 in this embodiment can reduce noise by 6dB.

[0095] Furthermore, the multiple noise reduction modules 22 include a first module 221, a second module 222, a third module 223 and a fourth module 224, wherein the first module 221 includes multiple modules, the second module 222 and the third module 223 each include two modules, and the fourth module 224 includes one module.

[0096] Multiple first modules 221 are connected end to end to form a ring-shaped noise reduction pipe section 23. The interior of the noise reduction pipe section 23 forms an airflow channel 21. The cross-section of the airflow channel 21 is rectangular, and the size of the noise reduction pipe section 23 is larger than the size of the air outlet 11.

[0097] Two second modules 222 are perpendicular to the air outlet module and are respectively arranged at both ends of the air inlet in the width direction, connected to the periphery of the silencer 20 inlet. Two third modules 223 are perpendicular to the air outlet module and are arranged at both ends of the air inlet in the width direction, connected to the periphery of the silencer 20 outlet. The two second modules 222 together form the air inlet of the air outlet. The two third modules 223 form the air outlet of the air outlet. The dimensions of the inlet and outlet are the same as the dimensions of the air outlet 11 of the main body 10, and the width of the air inlet is slightly larger than the width of the air outlet 11. That is to say, in this embodiment, the cross-sectional area of ​​the airflow channel 21 first increases and then decreases, and in the air outlet direction, the cross-section of the airflow channel 21 is rectangular.

[0098] The fourth module 224 is located in the middle of the airflow channel 21 in the width direction. The side of the fourth module 224 facing the air outlet 11 is formed as an arc surface that bulges towards the air outlet 11, which can be used to guide the airflow and prevent the generation of eddies.

[0099] Furthermore, the silencer 20 satisfies:

[0100]

[0101] Where t is the transmission coefficient of the silencer tube 20; k is the number of wave cycles per unit length in the direction of sound wave propagation; S 12 S is the cross-sectional area of ​​the inlet of airflow channel 21. 21 L1 is the cross-sectional area of ​​the airflow channel 21 excluding the inlet and outlet; L2 is the distance between the second module 222 and the third module 223.

[0102] Furthermore, experimental calculations show that the optimal sound absorption effect is achieved when the distance between the second module 222 and the third module 223 along the length of the silencer 20 is 1 / 4 of the sound wave wavelength.

[0103] According to the embodiments of the present invention, the ducted air conditioner 100, by setting a silencer 20 as in the first aspect embodiment, and using multiple noise reduction modules 22 spliced ​​and enclosed, can increase the sound absorption effect of the silencer 20, reduce the air outlet noise of the ducted air conditioner 100, and thus improve the user experience of the ducted air conditioner 100; at the same time, it can also make the silencer 20 flexibly assembled according to different models and installation spaces, thereby increasing the versatility of the silencer 20 and improving the market competitiveness of the ducted air conditioner 100.

[0104] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this 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. Therefore, they should not be construed as limitations on this invention.

[0105] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0106] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0107] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0108] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A silencer pipe, characterized in that, The silencer includes multiple noise reduction modules, which are spliced ​​together to form the silencer. An airflow channel is defined on the inner side of the silencer. Each noise reduction module has a resonant cavity and a connecting hole communicating with the resonant cavity. The resonant cavity communicates with the airflow channel through the connecting hole. The multiple noise reduction modules are detachably connected. The silencer includes at least one noise reduction tube segment, which is connected sequentially along the length of the silencer. At least a portion of the multiple noise reduction modules forms a first module, which is connected end-to-end along the circumference of the silencer to form the noise reduction tube segment. A portion of the multiple noise reduction modules forms a second module, which is perpendicular to the air outlet direction and connected to the periphery of the silencer inlet to block a portion of the inlet cross-section. A portion of the multiple noise reduction modules forms a third module, which is perpendicular to the air outlet direction and connected to the periphery of the silencer outlet to block a portion of the outlet cross-section. The silencer satisfies the following: Where t is the transmission coefficient of the silencer tube; k is the number of wave cycles per unit length in the direction of sound wave propagation; S 12 S is the cross-sectional area of ​​the inlet of the airflow channel. 21 L1 is the cross-sectional area of ​​the airflow channel excluding the inlet and outlet; L2 is the distance between the second module and the third module.

2. The silencer pipe according to claim 1, characterized in that, Along the airflow direction of the airflow channel, at least a portion of the cross-sectional area of ​​the airflow channel increases.

3. The silencer pipe according to claim 2, characterized in that, Along the airflow direction of the airflow channel, the cross-sectional area of ​​the airflow channel first increases and then decreases.

4. The silencer pipe according to claim 1, characterized in that, The wall of the airflow channel has a cavity that is recessed radially outward.

5. The silencer pipe according to claim 1, characterized in that, The airflow channel has a rectangular cross-section. A plane perpendicular to the length direction of the airflow channel is defined as a first plane. The first direction and the second direction within the first plane are the width direction and the height direction of the airflow channel, respectively. The third module and the second module are arranged on the same side of the airflow channel in the first direction. The second module blocks the cross-section of the inlet of the airflow channel at least one end in the first direction, and the third module blocks the cross-section of the outlet of the airflow channel at at least one end in the first direction.

6. The silencer pipe according to claim 1, characterized in that, Along the length of the silencer, the distance between the second module and the third module is 1 / 4 of the sound wave wavelength.

7. The silencer pipe according to claim 1, characterized in that, A portion of the noise reduction modules is formed into a fourth module. The fourth module is arranged parallel to the length direction of the silencer. The multiple fourth modules are disposed inside the silencer and divide the airflow channel into multiple sub-channels. The multiple sub-channels are arranged in a plane perpendicular to the length direction of the silencer.

8. The silencer pipe according to claim 7, characterized in that, In the plurality of fourth modules, the fourth module located at the inlet position of the airflow channel has a windward surface, which is disposed away from the outlet of the airflow channel, and the windward surface is an arc surface that is raised away from the outlet.

9. The silencer pipe according to any one of claims 1-8, characterized in that, The noise reduction module includes an outer plate, an inner plate, and a partition plate. The outer plate and the inner plate are arranged at intervals along the thickness direction of the noise reduction module. The partition plate connects the outer plate and the inner plate and divides the space between the outer plate and the inner plate into multiple resonant cavities. The connecting hole is formed on the inner plate.

10. The silencer pipe according to claim 1, characterized in that, The noise reduction module further includes an extension tube, which is connected to the periphery of the connecting hole and extends along the central axis of the connecting hole, and the extension tube is disposed inside the resonant cavity.

11. The silencer pipe according to claim 1, characterized in that, Each of the noise reduction modules has multiple resonant cavities, and each of the resonant cavities is connected to the airflow channel through at least one of the connecting holes.

12. The silencer pipe according to claim 11, characterized in that, The number of connecting holes in at least two of the resonant cavities in each of the noise reduction modules is different.

13. A ducted air conditioner, characterized in that it comprises a main body and a silencer pipe according to any one of claims 1-12, the main body having an air inlet and an air outlet; the silencer pipe being connected to the air inlet and / or the air outlet.

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