CN220817896U - Sound-absorbing pipe and air pipe machine with same - Google Patents

Abstract

The utility model discloses a silencing pipe and an air duct machine with the same, wherein the silencing pipe comprises a plurality of noise reduction modules, the noise reduction modules are spliced and enclosed to form the silencing pipe, an air outlet channel is defined at the inner side of the silencing pipe, the noise reduction modules are provided with resonant cavities and communication holes communicated with the resonant cavities, and the resonant cavities are communicated with the air flow channel through the communication holes. According to the sound-absorbing pipe, the sound-absorbing effect of the sound-absorbing pipe can be increased by utilizing the plurality of sound-absorbing modules to splice and surround the sound-absorbing pipe, the air-out noise of the air pipe machine is reduced, and the use experience of the air pipe machine can be further improved; meanwhile, the noise elimination pipe can be flexibly assembled according to the number of noise reduction modules designed by different models and installation spaces, so that the universality of the noise elimination pipe can be improved, and the market competitiveness of the air pipe machine is improved.

Description

Sound-absorbing pipe and air pipe machine with same

Technical Field

The utility model relates to the technical field of air conditioners, in particular to a silencing pipe and an air pipe machine with the silencing pipe.

Background

The air duct machine is a relatively commonly used air conditioner at present, but huge noise is often accompanied in the running process of a fan of an indoor unit of the air duct machine, the noise generated by the air duct machine comprises mechanical noise and airflow noise, but the airflow noise is far greater than the mechanical noise, and main airflow noise is generated at an air outlet of the air conditioner. The existing method for reducing the noise at the air outlet generally comprises the steps of arranging a sound absorbing material layer at the air outlet, absorbing the noise generated at the air outlet through the sound absorbing material layer, reducing the noise to a certain extent, modifying the structure at the air outlet, and achieving complex structure, poor sound absorbing effect, multiple types of air duct machines at present, different air duct machines with different types, and poor universality.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the silencing pipe, which can increase the sound absorption effect of the silencing pipe, reduce the air outlet noise of the air pipe machine and improve the use experience of the air pipe machine; meanwhile, the noise elimination pipe can be flexibly assembled according to the number of noise reduction modules designed by different models and installation spaces, so that the universality of the noise elimination pipe can be improved, and the market competitiveness of the air pipe machine is improved.

The utility model also provides an air duct machine with the silencing pipe.

According to the silencing tube of the first aspect of the utility model, the silencing tube comprises a plurality of noise reduction modules, the noise reduction modules are spliced and enclose the silencing tube, an air outlet channel is defined on the inner side of the silencing tube, the noise reduction modules are provided with resonant cavities and communication holes communicated with the resonant cavities, and the resonant cavities are communicated with the air flow channel through the communication holes.

According to the sound-absorbing pipe, the sound-absorbing effect of the sound-absorbing pipe can be increased by utilizing the plurality of sound-absorbing modules to splice and surround the sound-absorbing pipe, the air-out noise of the air pipe machine is reduced, and the use experience of the air pipe machine can be further improved; meanwhile, the noise elimination pipe can be flexibly assembled according to the number of noise reduction modules designed by different models and installation spaces, so that the universality of the noise elimination pipe can be improved, and the market competitiveness of the air pipe machine is improved.

According to some embodiments of the utility model, at least part of the air flow channel increases in cross-sectional area along the air flow direction of the air flow channel.

According to some embodiments of the utility model, the cross-sectional area of the gas flow channel increases and then decreases in the direction of the gas flow channel.

According to some embodiments of the utility model, the wall of the gas flow channel is formed with a radially outwardly concave cavity.

According to some embodiments of the utility model, the noise reduction pipe comprises at least one noise reduction pipe section, a plurality of noise reduction pipe sections are sequentially connected along the length direction of the noise reduction pipe, at least part of the noise reduction modules are formed into first modules, and the first modules are connected end to end along the circumferential direction of the noise reduction pipe to form the noise reduction pipe section.

According to some embodiments of the utility model, a part of the plurality of noise reduction modules is formed as a second module which is disposed perpendicular to the air outlet direction and connected to the peripheral edge of the inlet of the sound-deadening pipe so as to block a partial section of the inlet of the sound-deadening pipe.

According to some embodiments of the utility model, a part of the plurality of noise reduction modules is formed as a third module, which is disposed perpendicular to the air outlet direction and connected to a peripheral edge of the outlet of the sound-deadening pipe, so as to block a partial section of the outlet of the sound-deadening pipe.

According to some embodiments of the utility model, the cross section of the air flow channel is rectangular, a plane perpendicular to the length direction of the air flow channel is set as a first plane, the first direction and the second direction in the first plane are the width direction and the height direction of the air flow channel respectively, wherein the third module and the second module are arranged on the same side of the air flow channel in the first direction, the second module seals the cross section of at least one end of the inlet of the air flow channel in the first direction, and the third module seals the cross section of at least one end of the outlet of the air flow channel in the first direction.

According to some embodiments of the utility model, the sound attenuating tube satisfies:

Wherein t is the transmission coefficient of the silencing tube; k is the number of cycles per unit length in the direction of acoustic wave propagation; s ₁₂ is the cross-sectional area of the inlet of the airflow channel, S ₂₁ is the cross-sectional area of the airflow channel at the rest of the airflow channel except the inlet and the outlet; l2 is the spacing between the second module and the third module.

According to some embodiments of the utility model, a spacing between the second module and the third module is 1/4 of a wavelength of the acoustic wave in a length direction of the sound-absorbing pipe.

According to some embodiments of the utility model, a part of the plurality of noise reduction modules is formed as a fourth module, the fourth module is disposed parallel to the length direction of the sound reduction pipe, the plurality of fourth modules are disposed in the sound reduction pipe and divide the air flow channel into a plurality of sub-air channels, and the plurality of sub-air channels are arranged in a plane perpendicular to the length direction of the sound reduction pipe.

According to some embodiments of the utility model, among the plurality of fourth modules, the fourth module disposed at the inlet position of the airflow passage has a windward side disposed away from the inlet of the airflow passage, the windward side being a cambered surface protruding away from the outlet.

According to some embodiments of the utility model, the noise reduction module comprises: an outer plate portion, an inner plate portion, and a partition plate portion, the outer plate portion and the inner plate portion being arranged at intervals in a thickness direction of the noise reduction module, the partition plate portion being connected between the outer plate portion and the inner plate portion and dividing a space between the outer plate portion and the inner plate portion into a plurality of resonance chambers, the communication hole being formed in the inner plate portion.

According to some embodiments of the utility model, a plurality of the noise reduction modules are detachably connected.

According to some embodiments of the utility model, the noise reduction module further comprises: the extension pipe is connected with the periphery of the communication hole and extends along the central axis of the communication hole, and the extension pipe is arranged in the resonant cavity.

According to some embodiments of the utility model, each of the noise reduction modules has a plurality of the resonance chambers, each of which communicates with the air flow passage through at least one of the communication holes.

According to some embodiments of the utility model, the number of communication holes of at least two of the resonance chambers in each of the noise reduction modules is different.

The air duct machine according to the second aspect of the utility model comprises a main machine body and the silencing pipe according to the first aspect of the utility model, wherein the main machine body is provided with an air inlet and an air outlet; the silencing pipe is connected to the air inlet and/or the air outlet.

According to the air duct machine, the silencing pipe of the first aspect is arranged, so that the overall performance of the air duct machine is improved.

Additional aspects and advantages of the utility model 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 utility model.

Drawings

FIG. 1 is a schematic illustration of an air duct machine according to an embodiment of the present utility model;

FIG. 2 is an exploded view of an air duct machine according to an embodiment of the present utility model;

FIG. 3 is a partial exploded view of an air handler according to an embodiment of the present utility model;

FIG. 4 is a schematic view of an acoustic pipe according to an embodiment of the present utility model;

FIG. 5 is a schematic view of another angle of a sound tube according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view taken along line A-A shown in FIG. 5;

FIG. 7 is another angular cross-sectional view of a sound attenuating tube in accordance with an embodiment of the present utility model;

FIG. 8 is a further angular cross-sectional view of a sound attenuating tube in accordance with an embodiment of the present utility model;

fig. 9 is a simulated histogram of sound absorption and noise reduction effects of a sound reduction tube according to an embodiment of the present utility model.

Reference numerals:

100. an air duct machine;

10. a main body; 11. an air outlet;

20. An acoustic pipe; 21. an air flow channel; 22. a noise reduction module; 221. a first module; 222. a second module; 223. a third module; 224. a fourth module; 23. a noise reduction pipe section; 24. a resonant cavity; 25. a communication hole; 26. an extension tube;

30. A boom; 40. a bracket; 50. and a latch assembly.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

First, a brief description will be given of an air duct machine 100 according to an embodiment of the second aspect of the present utility model with reference to fig. 1 to 3, the air duct machine 100 including a muffler pipe 20 according to an embodiment of the first aspect of the present utility model.

As shown in fig. 1 to 3, an air duct machine 100 according to a second aspect of the present utility model includes a main body 10 and a muffler pipe 20 according to a first aspect of the present utility model, the main body 10 having an air inlet and an air outlet 11; the muffler pipe 20 is connected to the air inlet and/or the air outlet 11. That is, the muffler pipe 20 may be connected to the air inlet of the main body 10, may be connected to the air outlet 11 of the main body 10, or may be connected to the air inlet of the main body 10, or may be connected to the air outlet 11 of the main body 10.

Referring now to fig. 4-9, a muffler pipe 20 according to an embodiment of the first aspect of the present utility model will be described.

As shown in fig. 4 and 8, according to the muffler pipe 20 of the embodiment of the first aspect of the present utility model, the muffler pipe 20 includes a plurality of noise reduction modules 22, the plurality of noise reduction modules 22 are spliced and enclose the muffler pipe 20, an air flow passage 21 is defined at an inner side of the muffler pipe 20, the noise reduction modules 22 have a resonance chamber 24 and a communication hole 25 communicating with the resonance chamber 24, and the resonance chamber 24 communicates with the air flow passage 21 through the communication hole 25.

Specifically, the main body 10 may process the outdoor air and drive the air processed by the outdoor air into the room, so as to realize a device for providing fresh air to the room; the silencing tube 20 can guide the air flow, so that the air flow is guided into the room or the main machine 10 for treatment; meanwhile, the silencing tube 20 further comprises a plurality of noise reduction modules 22, so that the silencing tube 20 can further perform sound absorption and noise reduction treatment on the air outlet or the air inlet of the main machine body 10, air flow noise generated by the air pipe machine 100 is reduced, and the use comfort of a user is further improved.

When the air flow enters the air flow channel 21, sound waves generated by the air flow can enter the resonant cavity 24 through the communication holes 25, the sound waves can drive air in the resonator to vibrate in the resonant cavity 24, and the air can rub against the inner wall of the resonant cavity 24 during vibration, so that the energy of the sound waves can be converted into heat energy, the energy of the sound waves is reduced, the effects of sound absorption and noise reduction are achieved, when the natural frequency of the resonant cavity 24 is the same as the frequency of the sound waves, the sound waves can resonate with the air in the resonant cavity 24, the degree of the sound waves driving the air to vibrate is maximum, and at the moment, the degree of converting the energy of the sound waves into heat is the highest, namely the sound absorption and noise reduction effects of the resonant cavity 24 are optimal.

The number of the noise reduction modules 22 may be two, three or more, for example, the noise reduction modules 22 are spliced and bound to form the noise reduction pipe 20, and further, the number of the noise reduction modules 22 may be designed according to different models and installation spaces to flexibly assemble the noise reduction pipe 20, so that the universality of the noise reduction pipe 20 may be increased, and the market competitiveness of the air duct machine 100 may be improved; meanwhile, the plurality of noise reduction modules 22 can also increase the sound absorption effect, so that the noise reduction effect of the noise reduction pipe 20 can be increased, the air-out noise of the air duct machine 100 can be reduced, and the experience of a user can be improved.

According to the air duct machine 100 provided by the embodiment of the utility model, the plurality of noise reduction modules 22 are spliced and surround the noise elimination pipe 20, so that the sound absorption effect of the noise elimination pipe 20 can be increased, the air outlet noise of the air duct machine 100 is reduced, and the use experience of the air duct machine 100 can be further improved; meanwhile, the number of the noise reduction modules 22 can be designed for the noise reduction pipe 20 to be flexibly assembled according to different models and installation spaces, so that the universality of the noise reduction pipe 20 can be improved, and the market competitiveness of the air duct machine 100 can be improved.

According to some embodiments of the utility model, at least part of the cross-sectional area of the airflow channel 21 increases in the airflow direction of the airflow channel 21. That is, along the air flow direction of the air flow passage 21, the air flow passage 21 may have a partial or full cross-sectional area, so that noise can be reduced, wind resistance can be reduced, and the air-out effect of the muffler pipe 20 can be improved.

According to some embodiments of the present utility model, as shown in fig. 6 to 7, the cross-sectional area of the air flow channel 21 increases and then decreases in the air flow direction of the air flow channel 21. In this way, in the air flow direction of the air flow passage 21, the air flow passage 21 can reflect part of the sound wave, and then perform secondary resonance and sound absorption through the resonance chamber 24, so that noise can be further reduced.

According to some embodiments of the utility model, the wall of the airflow channel 21 is formed with a cavity recessed radially outwards. Therefore, when sound waves enter the cavity, the sound waves can be reflected and resonated for multiple times, and then the reflected waves and the attenuated waves can be formed for multiple times, so that noise can be further reduced, and the sound absorption effect is improved.

According to some embodiments of the present utility model, as shown in fig. 6, the muffler pipe 20 includes at least one noise reduction pipe segment 23, the plurality of noise reduction pipe segments 23 are sequentially connected along the length direction of the muffler pipe 20, at least part of the plurality of noise reduction modules 22 are formed as first modules 221, and the plurality of first modules 221 are connected end to end along the circumferential direction of the muffler pipe 20 to form the noise reduction pipe segment 23. For example, the number of the first modules 221 may be two, three, and more, and the number of the noise reduction pipe sections 23 may be one, two, three, and more. The noise reduction pipe section 23 is internally provided with an airflow channel 21, the plurality of first modules 221 are connected end to form an annular noise reduction pipe section 23, the annular noise reduction pipe section 23 can absorb sound waves in multiple directions in the circumferential direction, and then the sound absorption effect of the noise reduction pipe section 23 can be improved.

It should be noted that, in this embodiment, the cross-sectional areas of the plurality of noise reduction pipe sections 23 may be different, so that the number of noise reduction pipe sections 23 may be designed according to different modes, and the applicability of the noise reduction pipe 20 may be increased.

According to some embodiments of the present utility model, as shown in fig. 6, a portion of the plurality of noise reduction modules 22 is formed as a second module 222, and the second module 222 is disposed perpendicular to the air outlet direction and connected to the peripheral edge of the inlet of the muffler pipe 20 to block a partial section of the inlet of the muffler pipe 20. The second module 222 may increase the contact area between the muffler 20 and the main body 10, further may increase the connection tightness between the muffler 20 and the main body 10, and may effectively prevent the air flow from leaking from the gap between the muffler 20 and the main body 10, and further may ensure the air outlet effect of the air duct machine 100.

Further, the inlet of the muffler pipe 20 is identical to the air outlet 11 of the main body 10 in size, so that noise generated by the increase of the flow rate of the air can be avoided, and the air outlet effect of the air pipe machine 100 can be ensured.

According to some embodiments of the present utility model, as shown in fig. 7, a portion of the plurality of noise reduction modules 22 is formed as a third module 223, and the third module 223 is disposed perpendicular to the air outlet direction and connected to the peripheral edge of the outlet of the muffler pipe 20 to block a partial section of the outlet of the muffler pipe 20. In this way, the third module 223 may block and reflect a part of the sound wave of the airflow entering the airflow channel 21, so as to change the propagation path and speed of the sound wave, so that the sound wave may be reflected and absorbed in the airflow channel 21 for multiple times, and further noise may be reduced.

Further, the outlet of the muffler pipe 20 is consistent with the size of the air outlet 11 of the main body 10, so that the air outlet effect of the air pipe machine 100 can be ensured; meanwhile, noise generated by the increase of the flow velocity of the sound-absorbed air flow caused by the diameter shrinkage can be effectively avoided.

According to some embodiments of the present utility model, as shown in fig. 6 to 7, the cross section of the air flow channel 21 is rectangular, and a plane perpendicular to the length direction of the air flow channel 21 is set as a first plane, and a first direction (e.g., a left-right direction shown in fig. 7) and a second direction (e.g., an up-down direction shown in fig. 7) within the first plane are a width direction and a height direction of the air flow channel 21, respectively. Specifically, the rectangular structure is simple, and is adapted to the air outlet 11 of the main machine body 10, so that the assembly convenience and the space occupation ratio of the silencing tube 20 can be improved, and meanwhile, the air outlet smoothness of the air duct machine 100 can be increased, and the air outlet effect of the air duct machine 100 is ensured.

Wherein the third module 223 and the second module 222 are disposed on the same side of the airflow channel 21 in the first direction, the second module 222 blocks a cross section of at least one end of the inlet of the airflow channel 21 in the first direction, and the third module 223 blocks a cross section of at least one end of the outlet of the airflow channel 21 in the first direction. That is, the second module 222 may block only a cross section of one end of the inlet of the airflow passage 21 in the first direction, or may block a cross section of both ends of the inlet of the airflow passage 21 in the first direction; the third module 223 may block only a cross section of one end of the outlet of the airflow passage 21 in the first direction, or may block a cross section of both ends of the outlet of the airflow passage 21 in the first direction.

For example, as shown in fig. 6, the second module 222 and the third module 223 are disposed opposite to each other in the front-rear direction of the air flow passage 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 disposed at both ends in the first direction, and a U-shaped groove is formed at both ends of the air outlet 11. The width of the inlet of the airflow channel 21 defined between the two second modules 222 is the same as the width of the air outlet 11 of the main body 10, and the width of the outlet of the airflow channel 21 defined between the two third modules 223 is the same as the width of the air outlet 11.

According to some embodiments of the present utility model, the muffler pipe 20 satisfies:

Where t is the transmission coefficient of the sound-deadening pipe 20; k is the number of cycles per unit length in the direction of acoustic wave propagation; s ₁₂ is the cross-sectional area of the inlet of the airflow passage 21, and S ₂₁ is the cross-sectional area of the airflow passage 21 at the rest of the positions except the inlet and the outlet; l2 is the spacing between the second module 222 and the third module 223.

Specifically, when the noise emitted from the sound source propagates in the medium, the sound pressure or intensity thereof will be gradually attenuated as the propagation distance increases, and further, when the distance between the second module 222 and the third module 223 increases, the noise may be relatively reduced. t is the transmission coefficient of the sound-deadening pipe 20, and the smaller the projection coefficient is, the smaller the sound wave penetration rate is, and the higher the sound absorption effect is.

For example, as shown in fig. 6 to 7, S ₁₂＝L4×L3,S₂₁ =l1×l3, 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.

According to some embodiments of the present utility model, the spacing between the second module 222 and the third module 223 is 1/4 of the wavelength of the sound wave in the length direction of the sound-deadening pipe 20. It is calculated that, when L2 is equal to 1/4 wavelength of the sound wave, the projection coefficient is the smallest, so that the sound wave transmittance is the smallest, the noise of the air conditioner 100 is the lowest, and thus the distance between the second module 222 and the third module 223 is 1/4 of the sound wave wavelength, and the sound absorption effect of the sound absorption tube 20 can be obtained to the greatest extent.

According to some embodiments of the present utility model, as shown in fig. 6 to 7, a portion of the plurality of noise reduction modules 22 is formed as a fourth module 224, the fourth module 224 is disposed parallel to the length direction of the sound attenuating tube 20, the plurality of fourth modules 224 are disposed within the sound attenuating tube 20 and divide the air flow passage 21 into a plurality of sub-air passages, and the plurality of sub-air passages are arranged in a plane perpendicular to the length direction of the sound attenuating tube 20. The number of the fourth modules 224 may be set according to the width of the air outlet 11, and the plurality of sub-air channels may increase the sound absorbing effect of the sound absorbing tube 20, so as to further reduce the noise of the air duct machine 100.

According to some embodiments of the present utility model, as shown in fig. 6, among the plurality of fourth modules 224, the fourth module 224 disposed at the inlet position of the airflow passage 21 has a windward side disposed away from the outlet of the airflow passage, the windward side being a cambered surface protruding away from the outlet. The cambered surface can guide the airflow entering the airflow channel 21, so that the airflow can smoothly enter the airflow channel 21, and further, vortex generation on the surface of the fourth module 224 can be effectively prevented, and thus, noise generation can be further effectively reduced.

According to some embodiments of the utility model, the noise reduction module 22 includes: an outer plate portion, an inner plate portion, and a partition plate portion, the outer plate portion and the inner plate portion being arranged at intervals in a thickness direction of the noise reduction module 22, the partition plate portion being connected between the outer plate portion and the inner plate portion and dividing a space between the outer plate portion and the inner plate portion into a plurality of resonance chambers 24, and a communication hole 25 being formed in the inner plate portion. Therefore, the resonant cavity 24 is formed between the outer plate portion and the inner plate portion, the partition plate portion divides the resonant cavity 24 into a plurality of independent resonant cavities 24, and different resonant cavities 24 can be arranged to be resonant cavities 24 for absorbing noise with different frequencies, so that the sound absorption frequency band can be widened, the sound absorption effect is increased, and the air outlet noise of the air duct machine 100 is reduced.

According to some embodiments of the utility model, a plurality of noise reduction modules 22 are detachably connected. Therefore, the convenience of the assembly and disassembly of the silencing tube 20 can be improved, meanwhile, the silencing tube 20 can be flexibly assembled according to different models and installation spaces, and the universality of the silencing tube 20 is enhanced.

According to some embodiments of the utility model, as shown in fig. 7, the noise reduction module 22 further includes: and an extension pipe 26, the extension pipe 26 being connected to the periphery of the communication hole 25 and extending along the central axis of the communication hole 25, the extension pipe 26 being provided in the resonance chamber 24. Thus, extension tube 26 and resonant cavity 24 may be configured as a helmholtz resonating and muffling structure, specifically, the resonant frequency of the helmholtz resonating and muffling structure is calculated as follows:

Wherein ω is a resonance frequency of the helmholtz resonance muffling structure; c is the sound velocity; v is the volume of the resonant cavity and S is the cross-sectional area of the extension tube 26; l is the length of the extension tube 26.

Further, the volume of the resonant cavity 24 may be changed by changing the length, height or width of the resonant cavity 24, and the cross-sectional area of the extension pipe 26 may be changed according to the length and diameter of the extension pipe 26, so that, in the product design, the natural frequency of the resonant cavity 24 may be changed by changing the length of the extension pipe 26, the diameter of the communication hole 25 and the size of the resonant cavity 24, for example, by changing the size of one or more of the diameter d of the communication hole 25, the length L of the extension pipe 26, the length L of the resonant cavity 24, the width w of the resonant cavity 24 or the height h of the resonant cavity 24, so that the natural frequency of the resonant cavity 24 meets the design requirement, and at the same time, the form of the resonant cavity 24 meets the arrangement space requirement.

Optionally, the extension tube 26 extends inwardly of the resonant cavity 24 and/or the extension tube 26 extends outwardly away from the body. That is, the extension tube 26 may extend inwardly toward the cavity 24, the extension tube 26 may extend outwardly away from the body, or one end of the extension tube 26 may extend inwardly toward the cavity 24, and the other end may extend outwardly away from the body. Thereby, the extending direction of the extension pipe 26 can be adjusted according to the arrangement space requirement, so that the noise reduction device can be adapted to more arrangement space.

Preferably, the extension tube 26 is disposed in the resonant cavity 24, and the upper surface of the extension tube 26 is level with the upper surface of the resonant cavity 24, so that the appearance of the noise reduction module 22 can be neat, and the aesthetic property and the assembly convenience of the noise reduction tube 20 can be improved.

Alternatively, in some embodiments of the present utility model, the projection shape of the extension pipe 26 on the outer plate portion is circular, rectangular, triangular or pentagonal, and thus, the projection shape of the extension pipe 26 on the outer plate portion may be adjusted according to the actual situation of the arrangement space, thereby satisfying more product design requirements.

Alternatively, the speed of sound is typically 340m/s.

According to some embodiments of the present utility model, each noise reduction module 22 has a plurality of resonance chambers 24, and each resonance chamber 24 communicates with the airflow passage 21 through at least one communication hole 25. For example, the number of resonant cavities 24 may include two, three, and more. Wherein, each resonant cavity 24 can be through one or more intercommunicating pore 25 intercommunication air current passageway 21, like this, can make each resonant cavity 24 all can produce resonance effect, accomplish the sound absorption work, simultaneously, a plurality of resonant cavities 24 can also increase the noise reduction effect, reduce the noise of tuber pipe machine 100, improve customer's use experience and feel.

For example, the number of the communication holes 25 may be one, two, three or more, where when the number of the communication holes 25 is low, the absorption of the low-frequency sound wave is better, and when the number of the communication holes 25 is high, the absorption of the high-frequency sound wave is better, so that the number of the communication holes can be selected according to the frequency of the noise of the air duct machine, thus the sound wave can be better absorbed, and the noise is reduced.

It should be noted that, in this embodiment, the natural frequencies of the plurality of resonant cavities 24 may not be completely the same, so the noise reduction module 22 may have better sound absorption and noise reduction effects on sound waves with a plurality of frequencies, and the resonant cavities 24 with different frequencies may also generate coupling resonance, so that the sound absorption frequency band of the noise reduction module 22 may be widened, thereby realizing wide-band absorption to a greater extent, greatly reducing noise, and improving the use effect of the air duct machine 100.

According to some embodiments of the present utility model, the number of communication holes 25 of at least two resonant cavities 24 in each noise reduction module 22 is different. This allows the natural frequencies of at least two of the resonant cavities 24 to be different, thereby widening the sound absorption frequency band of the noise reduction module 22 and improving the sound absorption effect.

The ductwork machine 100 according to the embodiment of the second aspect of the present utility model includes the silencer duct 20 according to the embodiment of the above-described first aspect of the present utility model.

According to the ductwork machine 10 of the embodiment of the present utility model, by providing the silencer duct 20 of the embodiment of the first aspect described above, the overall performance of the ductwork machine 100 is improved.

1-3, In some embodiments of the present utility model, the air duct machine 100 further includes a boom 30, a bracket 40, and a latch assembly 50, and the main body 10 further includes a lifting lug formed thereon, specifically, the bracket 40 includes a connection plate and a mounting plate, where the connection plate and the mounting plate are both formed in an L shape, and a latch via hole is formed on the connection plate, and the latch assembly 50 connects the connection plate and the muffler pipe 20 through the latch via hole; the connecting plate is connected in the mounting panel and is close to one side between the main part, is formed with the mounting hole on the connecting plate, and the fastener passes the mounting hole and makes between support 40 and the main part link to each other, and in addition, the upper end of connecting plate is formed with the extension towards the extension, is formed with the mounting groove on the extension, and the mounting groove is worn to establish to the jib 30 and cooperate in the lug for fixed mounting tuber pipe machine 100.

An air duct machine 100 according to an embodiment of the present utility model is described below with reference to fig. 1 to 9.

Referring to fig. 1, an air duct machine 100 includes a main body 10, a hanger 30, a bracket 40, and a muffler pipe 20, wherein the muffler pipe 20 is connected to the main body 10 through the bracket 40, the bracket 40 is connected to the main body 10 through a fastener, the main body 10 has an air outlet 11, the muffler pipe 20 is connected to the main body 10 at the position of the air outlet 11, an air flow channel 21 is defined at the inner side of the muffler pipe 20, and air flows into the air flow channel 21 through the air outlet 11 of the main body 10.

Specifically, the main body 10 is further formed with a lifting lug, the bracket 40 includes a connecting plate and a mounting plate, both of which are formed in an L shape, wherein a latch via hole is formed in the connecting plate, and the latch assembly 50 passes through the latch via hole to connect the connecting plate and the muffler pipe 20; the connecting plate is connected in the mounting panel and is close to one side between the main part, is formed with the mounting hole on the connecting plate, and the fastener passes the mounting hole and makes between support 40 and the main part link to each other, and in addition, the upper end of connecting plate is formed with the extension towards the extension, is formed with the mounting groove on the extension, and the mounting groove is worn to establish to the jib 30 and cooperate in the lug for fixed mounting tuber pipe machine 100.

Specifically, the muffler pipe 20 includes a plurality of noise reduction modules 22, and the plurality of noise reduction modules 22 are spliced and enclose the muffler pipe 20, and the noise reduction modules 22 have a resonance chamber 24 and a communication hole 25 communicating with the resonance chamber 24, and the resonance chamber 24 communicates with the airflow passage 21 through the communication hole 25.

The noise reduction module 22 includes an outer plate portion, an inner plate portion, a partition plate portion and an extension tube 26, wherein the outer plate portion and the inner plate portion are disposed at intervals along a thickness direction of the noise reduction module 22, the partition plate portion is connected between the outer plate portion and the inner plate portion and divides a space between the outer plate portion and the inner plate portion into a plurality of resonance cavities 24, a communication hole 25 is formed on the inner plate portion, the extension tube 26 is connected at a peripheral edge of the communication hole 25 and extends along a central axis of the communication hole 25, the extension tube 26 is disposed in the resonance cavities 24, an upper end face of the extension tube 26 is flush with an upper end face of the inner plate portion, and the extension tube 26 and the resonance cavities 24 are configured as a helmholtz resonance noise reduction structure. Wherein the plurality of helmholtz resonating silencing structures together construct a plurality of noise reduction modules 22.

The sound-absorbing pipe 20 in this embodiment is composed of 100 helmholtz resonance sound-absorbing structures, the natural frequencies of the helmholtz resonance sound-absorbing structures are different, the sound-absorbing frequency bands are different, and the coupling resonance of the plurality of resonant cavities 24 can be widened by adjusting and controlling the position layout, so that the coupling resonance of the plurality of resonant cavities can be respectively applied to the noise frequency peak part of the air duct machine 100.

For example, as shown in fig. 9, the sound absorption and noise reduction effects of the ducted air conditioner 100 including the muffler pipe 20 of the present embodiment are simulated, and the sound absorption and noise reduction effects of the ducted air conditioner 100 not including the muffler pipe 20 of the present embodiment are simulated, and the sound absorption and noise reduction effects of the ducted air conditioner 100 of the two structures are compared. Experiments show that the noise frequency peak value of the air duct machine 100 is 300-1800Hz, so that the sound absorption bandwidth of the silencing pipe 20 can be set at 300-1800Hz, and in fig. 9, after the silencing pipe 20 is arranged, the sound absorption and noise reduction effects of the air duct machine 100 are improved in a plurality of sound wave frequency bands; meanwhile, under the condition of the same outline and air volume of the air pipe machine 100 under the frequency of 300-1800Hz of the designed frequency band, the noise reduction pipe 20 can reduce the noise by 6dB.

Further, the plurality of noise reduction modules 22 includes a first module 221, a second module 222, a third module 223, and a fourth module 224, where the first module 221 includes a plurality of noise reduction modules, the second module 222 and the third module 223 include two noise reduction modules, and the fourth module 224 includes one noise reduction module.

The plurality of first modules 221 are formed into a ring-shaped noise reduction pipe section 23 in an end-to-end connection manner, an air flow channel 21 is formed inside the noise reduction pipe section 23, the cross section of the air flow channel 21 is rectangular, and the size of the noise reduction pipe section 23 is larger than that of the air outlet 11.

The two second modules 222 are perpendicular to the air outlet module and are respectively arranged at two ends of the air inlet pipe in the width direction and connected with the periphery of the inlet of the silencing pipe 20, the two third modules 223 are perpendicular to the air outlet module and are arranged at two ends of the air inlet pipe in the width direction and connected with the periphery of the outlet of the silencing pipe 20, and the inlet of the air inlet pipe is formed between the two second modules 222. The two third modules 223 are formed as outlets of the air inlet duct, and the sizes of the inlet and the outlet are identical to the size of the air outlet 11 of the main body 10, and the width size of the air inlet duct is slightly larger than the width size of the air outlet 11. That is, the cross-sectional area of the airflow passage 21 in the present embodiment increases and decreases, and the cross-section of the airflow passage 21 in the air-out direction forms a rectangle.

The fourth module 224 is disposed at the middle part of the air flow channel 21 in the width direction, and a surface of the fourth module 224 disposed toward the air outlet 11 is formed into a cambered surface protruding toward the air outlet 11, which can be used for drainage and preventing vortex generation.

Further, the muffler pipe 20 satisfies:

Where t is the transmission coefficient of the sound-deadening pipe 20; k is the number of cycles per unit length in the direction of acoustic wave propagation; s ₁₂ is the cross-sectional area of the inlet of the airflow passage 21, and S ₂₁ is the cross-sectional area of the airflow passage 21 at the rest of the positions except the inlet and the outlet; l2 is the spacing between the second module 222 and the third module 223.

Further, it is experimentally calculated that the distance between the second module 222 and the third module 223 in the length direction of the sound-deadening pipe 20 is 1/4 of the wavelength of the sound wave, and the sound absorption effect is optimal.

According to the air duct machine 100 of the embodiment of the present utility model, by arranging the silencer duct 20 of the embodiment of the first aspect, and splicing and surrounding the silencer duct 20 by using the plurality of noise reduction modules 22, the sound absorption effect of the silencer duct 20 can be increased, the air-out noise of the air duct machine 100 can be reduced, and the use experience of the air duct machine 100 can be further improved; meanwhile, the number of the noise reduction modules 22 can be designed for the noise reduction pipe 20 to be flexibly assembled according to different models and installation spaces, so that the universality of the noise reduction pipe 20 can be improved, and the market competitiveness of the air duct machine 100 can be improved.

In the description of the present utility model, 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; the device can be mechanically connected, electrically connected and communicated; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims (18)

1. The utility model provides a sound elimination pipe, its characterized in that, sound elimination pipe includes a plurality of noise reduction module, a plurality of noise reduction module concatenation encloses out sound elimination pipe, the inboard of sound elimination pipe is limited out the air current passageway, noise reduction module have resonant cavity and with the intercommunicating pore of resonant cavity intercommunication, the resonant cavity passes through the intercommunicating pore with air current passageway intercommunication.

2. The sound tube of claim 1, wherein at least a portion of the airflow channel increases in cross-sectional area along the airflow direction of the airflow channel.

3. The sound tube of claim 2, wherein the cross-sectional area of the air flow channel increases and decreases in the air flow direction of the air flow channel.

4. The sound tube of claim 1, wherein the wall of the airflow passage is formed with a radially outwardly concave cavity.

5. The muffler pipe as claimed in claim 1, wherein the muffler pipe includes at least one noise reduction pipe section, a plurality of the noise reduction pipe sections are sequentially connected along a length direction of the muffler pipe,

At least part of the plurality of noise reduction modules are formed into first modules, and the plurality of first modules are connected end to end along the circumferential direction of the noise reduction pipe to form the noise reduction pipe section.

6. The muffler pipe of claim 5, wherein portions of the plurality of noise reduction modules are formed as a second module disposed perpendicular to the air outlet direction and connected to a peripheral edge of the inlet of the muffler pipe to block a partial section of the inlet of the muffler pipe.

7. The muffler pipe as claimed in claim 6, wherein a portion of the plurality of noise reduction modules is formed as a third module which is disposed perpendicular to the air outlet direction and connected to a peripheral edge of the outlet of the muffler pipe to block a partial section of the outlet of the muffler pipe.

8. The sound-absorbing pipe according to claim 7, wherein the cross section of the air flow passage is rectangular, a plane perpendicular to the longitudinal direction of the air flow passage is set as a first plane, the first direction and the second direction in the first plane are the width direction and the height direction of the air flow passage, respectively,

Wherein the third module and the second module are arranged on the same side of the airflow channel in the first direction, the second module seals the section of at least one end of the inlet of the airflow channel in the first direction, and the third module seals the section of at least one end of the outlet of the airflow channel in the first direction.

9. The sound-damping tube of claim 7, wherein the sound-damping tube satisfies:

Wherein t is the transmission coefficient of the silencing tube; k is the number of cycles per unit length in the direction of acoustic wave propagation; s ₁₂ is the cross-sectional area of the inlet of the airflow channel, S ₂₁ is the cross-sectional area of the airflow channel at the rest of the airflow channel except the inlet and the outlet; l2 is the spacing between the second module and the third module.

10. The sound tube of claim 9, wherein the spacing between the second and third modules is 1/4 of the wavelength of sound waves in the length direction of the sound tube.

11. The muffler pipe of claim 7, wherein a portion of the plurality of noise reduction modules is formed as a fourth module, the fourth module being disposed parallel to a length direction of the muffler pipe, the plurality of fourth modules being disposed within the muffler pipe and dividing the airflow passage into a plurality of sub-air passages, the plurality of sub-air passages being arranged in a plane perpendicular to the length direction of the muffler pipe.

12. The sound tube of claim 11, wherein among the plurality of fourth modules, the fourth module disposed at the inlet location of the airflow passage has a windward side disposed away from the outlet of the airflow passage, the windward side being a cambered surface protruding away from the outlet.

13. The sound reduction tube according to any one of claims 1-12, wherein the noise reduction module comprises: an outer plate portion, an inner plate portion, and a partition plate portion, the outer plate portion and the inner plate portion being arranged at intervals in a thickness direction of the noise reduction module, the partition plate portion being connected between the outer plate portion and the inner plate portion and dividing a space between the outer plate portion and the inner plate portion into a plurality of resonance chambers, the communication hole being formed in the inner plate portion.

14. The sound tube of claim 1 wherein a plurality of said noise reduction modules are detachably connected.

15. The sound reduction tube of claim 1, wherein the noise reduction module further comprises: the extension pipe is connected with the periphery of the communication hole and extends along the central axis of the communication hole, and the extension pipe is arranged in the resonant cavity.

16. The sound tube of claim 1, wherein each of said sound reduction modules has a plurality of said resonance chambers, each of said resonance chambers being in communication with said air flow passage through at least one of said communication holes.

17. The sound pipe according to claim 16, wherein the number of the communication holes of at least two of the resonance chambers in each of the noise reduction modules is different.

18. An air duct machine comprising a main body and the sound-reducing duct according to any one of claims 1 to 17, the main body having an air inlet and an air outlet; the silencing pipe is connected to the air inlet and/or the air outlet.