Silencing pipe and duct type air conditioner with same

Abstract

The silencing pipe comprises a plurality of noise reduction modules, the multiple noise reduction modules are spliced and define the silencing pipe, an airflow channel is defined by the inner side of the silencing pipe, each noise reduction module is provided with a resonant cavity and a communicating hole communicating with the resonant cavity, and the communicating holes are communicated with the resonant cavity. And the resonant cavity is communicated with the airflow channel through the communicating hole. According to the silencing pipe, the multiple noise reduction modules are spliced and encircled to form the silencing pipe, the sound absorption effect of the silencing pipe can be improved, the air outlet noise of the duct type air conditioner can be reduced, and then the use experience of the duct type air conditioner can be improved; meanwhile, the number of the noise reduction modules can be designed according to different types and installation spaces of the silencing pipe so that the silencing pipe can be flexibly assembled, the universality of the silencing pipe can be improved, and the market competitiveness of the duct type air conditioner can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to a muffler pipe and a duct air conditioner having the same. Background Art

[0002] Duct air conditioners are currently the most commonly used air conditioners, but the operation of the fan of the indoor unit of the duct air conditioner is often accompanied by huge noise. The noise generated includes mechanical noise and airflow noise, but the airflow noise is much greater than the mechanical noise, and the main airflow noise is generated at the air outlet of the air conditioner. The existing method of reducing the noise at the air outlet is generally to set a sound-absorbing material layer at the air outlet to absorb the noise generated at the air outlet through the sound-absorbing material layer. This method can reduce the noise to a certain extent, but it requires the structure of the air outlet to be modified. The structure is complex and the sound absorption effect is poor. In addition, there are many models of duct air conditioners at present, and different models need to be equipped with different air ducts, which has poor versatility. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a muffler that can increase the sound absorption effect of the muffler, reduce the air outlet noise of the duct air conditioner, and improve the user experience of the duct air conditioner; at the same time, the muffler can also be designed according to different models and installation spaces. The number of noise reduction modules can be flexibly assembled, thereby increasing the versatility of the muffler and improving the market competitiveness of the duct air conditioner.

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

[0005] According to the first aspect of the present invention, the silencer tube comprises a plurality of noise reduction modules, the plurality of noise reduction modules are spliced ​​and enclose the silencer tube, the inner side of the silencer tube defines an air flow channel, the noise reduction module has a resonance cavity and a connecting hole connected to the resonance cavity, and the resonance cavity is connected to the air flow channel through the connecting hole.

[0006] According to the silencer pipe of the present invention, a plurality of noise reduction modules are used to splice and enclose the silencer pipe, so that the sound absorption effect of the silencer pipe can be increased, the air outlet noise of the duct machine can be reduced, and the user experience of the duct machine can be improved; at the same time, the number of noise reduction modules can be designed according to different machine models and installation spaces for flexible assembly of the silencer pipe, thereby increasing the versatility of the silencer pipe and improving the market competitiveness of the duct machine.

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

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

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

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

[0011] According to some embodiments of the present invention, some of the multiple noise reduction modules are formed into a second module, which is arranged perpendicular to the air outlet direction and connected to the periphery of the inlet of the muffler duct to block a partial cross-section of the inlet of the muffler duct.

[0012] According to some embodiments of the present invention, some of the multiple noise reduction modules are formed into a third module, and the third module is arranged perpendicular to the air outlet direction and connected to the periphery of the outlet of the silencer duct to block a partial cross-section of the outlet of the silencer duct.

[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 set as a first plane, and the first direction and the second direction within the first plane are the width direction and the height direction of the airflow channel, 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 blocks the cross-section of at least one end of the inlet of the airflow channel in the first direction, and the third module blocks the cross-section of at least one end of the outlet of the airflow channel in the first direction.

[0014] According to some embodiments of the present invention, the muffler meets the following requirements:

[0015]

[0016] Wherein, t is the transmission coefficient of the muffler; k is the number of cycles per unit length in the direction of sound wave propagation; S 12 is the cross-sectional area of ​​the inlet of the air flow channel, S 21 is the cross-sectional area of ​​the air flow channel except 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 muffler, the distance between the second module and the third module is 1 / 4 of the wavelength of the sound wave.

[0018] According to some embodiments of the present invention, some of the multiple noise reduction modules are formed into a fourth module, and the fourth module is arranged parallel to the length direction of the muffler pipe. The multiple fourth modules are arranged in the muffler pipe and divide the air flow channel into multiple sub-air ducts, and the multiple sub-air ducts are arranged in a plane perpendicular to the length direction of the muffler pipe.

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

[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, 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 resonance cavities, and the connecting hole is formed on the inner plate portion.

[0021] According to some embodiments of the present invention, a plurality of the 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 is connected to the periphery of the communicating hole and extends along the central axis of the communicating hole, and the extension tube is disposed in the resonance cavity.

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

[0024] According to some embodiments of the present invention, at least two of the resonance cavities in each of the noise reduction modules have different numbers of the communication holes.

[0025] The duct machine according to the second aspect of the present invention comprises a main body and a silencer according to the first aspect of the present invention, wherein the main body has an air inlet and an air outlet; the silencer is connected to the air inlet and / or the air outlet.

[0026] According to the duct air conditioner of the present invention, the overall performance of the duct air conditioner is improved by providing the silencer pipe of the first aspect.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

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

[0033] Figure 6 is along Figure 5 A cross-sectional view of the line AA shown in FIG.

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

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

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

[0037] Reference numerals:

[0038] 100. Duct machine;

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

[0040] 20. muffler; 21. air flow 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. Suspension rod; 40. Bracket; 50. Locking assembly. DETAILED DESCRIPTION

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

[0043] First, refer to Figure 1-Figure 3The duct air conditioner 100 according to the second embodiment of the present invention is briefly described. The duct air conditioner 100 includes the silencer 20 according to the first embodiment of the present invention.

[0044] like Figure 1-Figure 3 As shown, the air duct machine 100 according to the second aspect of the present invention comprises a main body 10 and a muffler pipe 20 according to the first aspect of the present invention, the main body 10 has an air inlet and an air outlet 11; the muffler pipe 20 is connected to the position of the air inlet and / or the air outlet 11. That is, the muffler pipe 20 can be connected to the air inlet of the main body 10, and can also be connected to the air outlet 11 of the main body 10, and can also be connected to both the air inlet of the main body 10 and the air outlet 11 of the main body 10.

[0045] Reference below Figure 4-Figure 9 A sound-absorbing duct 20 according to an embodiment of the first aspect of the present invention will be described.

[0046] like Figure 4 and Figure 8 As shown, according to the silencer 20 of the first aspect of the embodiment of the present invention, the silencer 20 includes a plurality of noise reduction modules 22, and the plurality of noise reduction modules 22 are spliced ​​and enclose the silencer 20, and the inner side of the silencer 20 defines an air flow channel 21, and the noise reduction module 22 has a resonance cavity 24 and a connecting hole 25 connected to the resonance cavity 24, and the resonance cavity 24 is connected to the air flow channel 21 through the connecting hole 25.

[0047] Specifically, the main body 10 can process outdoor air and drive the processed outdoor gas into the room, so as to realize a device for providing fresh air to the room; the silencer 20 can guide the airflow and direct the airflow to the room or the main machine 10 for processing; at the same time, since the silencer 20 also includes a plurality of noise reduction modules 22, the silencer 20 can also perform sound absorption and noise reduction processing on the air outlet or air inlet of the main body 10, thereby reducing the airflow noise generated by the duct machine 100 and further improving the user's comfort.

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

[0049] The noise reduction module 22 includes multiple noise reduction modules 22, for example, the number of noise reduction modules 22 can be two, three or more, and multiple noise reduction modules 22 are spliced ​​and enclosed to form a silencer 20. Therefore, the number of noise reduction modules 22 can be designed according to different machine models and installation spaces to flexibly assemble the silencer 20, thereby increasing the versatility of the silencer 20 and improving the market competitiveness of the duct machine 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 20, reducing the air outlet noise of the duct machine 100, and improving the user experience.

[0050] According to the duct air conditioner 100 of the embodiment of the present invention, by utilizing a plurality of noise reduction modules 22 to splice and enclose a silencer duct 20, the sound absorption effect of the silencer duct 20 can be increased, the air outlet noise of the duct air conditioner 100 can be reduced, and the use experience of the duct air conditioner 100 can be improved; at the same time, the silencer duct 20 can be flexibly assembled by designing the number of noise reduction modules 22 according to different models and installation spaces, thereby increasing the versatility of the silencer duct 20 and improving the market competitiveness of the duct air conditioner 100.

[0051] According to some embodiments of the present invention, along the airflow direction of the airflow channel 21, the cross-sectional area of ​​at least part of the airflow channel 21 is increased. That is, along the airflow direction of the airflow channel 21, the cross-sectional area of ​​part of the airflow channel 21 can be increased, or the cross-sectional area of ​​the whole airflow channel 21 can be increased, so that the wind resistance can be reduced while reducing the noise, and the air outlet effect of the muffler 20 can be improved.

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

[0053] According to some embodiments of the present invention, a cavity that is concave radially outward is formed on the wall surface of the airflow channel 21. In this way, when sound waves enter the cavity, they can be reflected and resonated multiple times, and then multiple reflections and attenuation waves can be formed, thereby further reducing noise and improving the sound absorption effect.

[0054] According to some embodiments of the present invention, Figure 6As shown, the muffler 20 includes at least one noise reduction pipe section 23, and multiple noise reduction pipe sections 23 are sequentially connected along the length direction of the muffler 20. At least part of the multiple noise reduction modules 22 is formed as a first module 221, and multiple first modules 221 are connected end to end along the circumference of the muffler 20 to form a noise reduction pipe section 23. For example, the number of first modules 221 can be two, three or more, and the number of noise reduction pipe sections 23 can be one, two, three or more. Among them, an air flow channel 21 is formed inside the noise reduction pipe section 23, and multiple first modules 221 are connected end to 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, thereby increasing the sound absorption effect of the noise reduction pipe section 23.

[0055] It should be noted that, in the present embodiment, the cross-sectional areas of the plurality of noise reduction pipe sections 23 may be different, and thus the number of noise reduction pipe sections 23 may be designed according to different modes, which may increase the applicability of the silencer 20 .

[0056] According to some embodiments of the present invention, Figure 6 As shown, part of the multiple noise reduction modules 22 is formed into a second module 222, and the second module 222 is arranged perpendicular to the air outlet direction and connected to the periphery of the inlet of the muffler 20 to block a part of the cross section of the inlet of the muffler 20. Among them, the second module 222 can increase the contact area between the muffler 20 and the main body 10, thereby increasing the tightness of the connection between the muffler 20 and the main body 10, and can effectively prevent the airflow from leaking from the gap between the muffler 20 and the main body 10, thereby ensuring the air outlet effect of the duct air conditioner 100.

[0057] Furthermore, the inlet of the silencer 20 is consistent in size with the air outlet 11 of the main body 10 , so that the noise generated by the increase in gas flow rate can be avoided, and at the same time, the air outlet effect of the duct air conditioner 100 can be guaranteed.

[0058] According to some embodiments of the present invention, Figure 7 As shown, part of the multiple noise reduction modules 22 is formed into a third module 223, and the third module 223 is arranged perpendicular to the air outlet direction and connected to the periphery of the outlet of the muffler 20 to block a part of the cross section of the outlet of the muffler 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, so that the sound waves can be reflected and absorbed multiple times in the airflow channel 21, thereby further reducing the noise.

[0059] Furthermore, the outlet of the silencer 20 is consistent with the size of the air outlet 11 of the main body 10, so that the air outlet effect of the duct air conditioner 100 can be guaranteed; at the same time, it can also effectively avoid the noise caused by the increase in flow velocity due to the reduction in diameter of the air flow after sound absorption.

[0060] According to some embodiments of the present invention, Figure 6-Figure 7 As shown, the cross section of the airflow channel 21 is rectangular, and a plane perpendicular to the length direction of the airflow channel 21 is set as a first plane. A first direction (eg Figure 7 left and right directions as shown) and a second direction (e.g. Figure 7 The vertical direction shown in the figure is respectively the width direction and the height direction of the air flow channel 21. Specifically, the rectangular structure is simple and is adapted to the air outlet 11 of the main body 10, thereby improving the assembly convenience and space occupation of the muffler 20, and at the same time, it can also increase the smoothness of the air outlet of the duct air conditioner 100 and ensure the air outlet effect of the duct air conditioner 100.

[0061] 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 the 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 the cross section of at least one end of the outlet of the airflow channel 21 in the first direction. In other words, the second module 222 can only block the cross section of one end of the inlet of the airflow channel 21 in the first direction, or can block the cross section of both ends of the inlet of the airflow channel 21 in the first direction; the third module 223 can only block the cross section of one end of the outlet of the airflow channel 21 in the first direction, or can block the cross section of both ends of the outlet of the airflow channel 21 in the first direction.

[0062] For example Figure 6 As shown, the second module 222 and the third module 223 are arranged opposite to each other in the front-to-back direction of the airflow channel 21, and 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 arranged at both ends in the first direction, and U-shaped grooves are formed at both ends of the air outlet 11. Among them, the inlet of the airflow channel 21 defined between the two second modules 222, and the width of the inlet is the same as the width of the air outlet 11 of the main body 10, and the outlet of the airflow channel 21 defined between the two third modules 223, and the width of the outlet is also the same as the width of the air outlet 11.

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

[0064]

[0065] Wherein, t is the transmission coefficient of the muffler 20; k is the number of cycles per unit length in the direction of sound wave propagation; S 12 is the cross-sectional area of ​​the inlet of the air flow channel 21, S 21is the cross-sectional area of ​​the remaining positions of the air flow channel 21 except the inlet and the outlet; L2 is the distance between the second module 222 and the third module 223.

[0066] Specifically, when the noise emitted by the sound source propagates in the medium, its sound pressure or sound intensity will gradually decay as the propagation distance increases, and thus, when the distance between the second module 222 and the third module 223 increases, the noise can be relatively reduced. t is the transmission coefficient of the muffler 20. The smaller the transmission coefficient, the smaller the sound wave penetration rate, and thus the higher the sound absorption effect.

[0067] For example Figure 6-Figure 7 As shown, S 12 =L4×L3,S 21 =L1×L3, wherein L1 is the width of the air flow channel 21, L3 is the height of the air flow channel 21, and L4 is the width of the air outlet 11.

[0068] According to some embodiments of the present invention, in the length direction of the muffler 20, the spacing between the second module 222 and the third module 223 is 1 / 4 of the wavelength of the sound wave. It is calculated that when L2 is equal to 1 / 4 of the wavelength of the sound wave, the projection coefficient is the smallest, and therefore, the sound wave transmittance is the smallest, and the noise of the duct machine 100 is the lowest, so that the spacing between the second module 222 and the third module 223 is 1 / 4 of the wavelength of the sound wave, and the muffler 20 can obtain the maximum sound absorption effect.

[0069] According to some embodiments of the present invention, Figure 6-Figure 7 As shown, part of the multiple noise reduction modules 22 is formed into a fourth module 224, the fourth module 224 is arranged parallel to the length direction of the muffler 20, and the multiple fourth modules 224 are arranged in the muffler 20 and divide the air flow channel 21 into multiple sub-air ducts, and the multiple sub-air ducts are arranged in a plane perpendicular to the length direction of the muffler 20. Among them, the number of the fourth modules 224 can be set according to the width of the air outlet 11, and the multiple sub-air ducts can increase the sound absorption effect of the muffler 20, thereby further reducing the noise of the duct machine 100.

[0070] According to some embodiments of the present invention, Figure 6 As shown, 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, the windward surface is disposed away from the outlet of the airflow channel, and the windward surface is a curved surface convex away from the outlet. The curved surface can guide the airflow entering the airflow channel 21, so that the airflow can smoothly enter the airflow channel 21, thereby effectively preventing eddy currents from being generated on the surface of the fourth module 224, thereby further effectively reducing the generation of noise.

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

[0072] According to some embodiments of the present invention, multiple noise reduction modules 22 are detachably connected, which can increase the convenience of installation and removal of the muffler 20, and at the same time, the muffler 20 can be flexibly assembled according to different models and installation spaces, thereby enhancing the versatility of the muffler 20.

[0073] According to some embodiments of the present invention, Figure 7 As shown, the noise reduction module 22 further includes: an extension tube 26, 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, and the extension tube 26 is arranged in the resonance cavity 24. Therefore, the extension tube 26 and the resonance cavity 24 can be configured to form a Helmholtz resonance silencing structure. Specifically, the resonance frequency of the Helmholtz resonance silencing structure is calculated as follows:

[0074]

[0075] Wherein, ω is the resonance frequency of the Helmholtz resonance silencing structure; C is the speed of sound; V is the volume of the resonance cavity; S is the cross-sectional area of ​​the extension tube 26 ; and L is the length of the extension tube 26 .

[0076] Furthermore, the volume of the resonance cavity 24 can be changed by changing the length, height or width of the resonance cavity 24, and the cross-sectional area of ​​the extension tube 26 can be changed according to the length and diameter of the extension tube 26. Therefore, in product design, when the sound speed remains unchanged, the natural frequency of the resonance cavity 24 can be changed by changing the length of the extension tube 26, the diameter of the connecting hole 25 and the size of the resonance cavity 24. For example, by changing one or more of the diameter d of the connecting hole 25, the length L of the extension tube 26, the length l of the resonance cavity 24, the width w of the resonance cavity 24 or the height h of the resonance cavity 24, the natural frequency of the resonance cavity 24 can meet the design requirements, and at the same time, the shape of the resonance cavity 24 can meet the requirements of the layout space.

[0077] Optionally, the extension tube 26 extends toward the resonance cavity 24, and / or the extension tube 26 extends outward away from the main body. In other words, the extension tube 26 may extend toward the resonance cavity 24, or may extend outward away from the main body, or may have one end of the extension tube 26 extend toward the resonance cavity 24 and the other end extend outward away from the main body. Thus, the extension direction of the extension tube 26 can be adjusted according to the layout space requirements, so that the noise reduction device can adapt to more layout spaces.

[0078] Preferably, the extension tube 26 is disposed in the resonance cavity 24 , and the upper surface of the extension tube 26 is flush with the upper surface of the resonance cavity 24 , which can increase the neatness of the appearance of the noise reduction module 22 , and further increase the aesthetics and assembly convenience of the silencer 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 layout space, thereby meeting more product design needs.

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

[0081] According to some embodiments of the present invention, each noise reduction module 22 has a plurality of resonance cavities 24, and each resonance cavity 24 is connected to the air flow channel 21 through at least one connecting hole 25. For example, the number of resonance cavities 24 may include two, three or more. Among them, each resonance cavity 24 may be connected to the air flow channel 21 through one or more connecting holes 25, so that each resonance cavity 24 can produce a resonance effect to complete the sound absorption work. At the same time, multiple resonance cavities 24 can also increase the noise reduction effect, reduce the noise of the duct machine 100, and improve the customer's use 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. Then, the number of connecting holes can be selected according to the frequency of the duct machine noise, which can better absorb sound waves and reduce noise.

[0083] It should be noted that, in the present embodiment, the natural frequencies of the plurality of resonance cavities 24 may not be exactly the same, so that the noise reduction module 22 can have a good sound absorption and noise reduction effect on sound waves of multiple frequencies, and the resonance cavities 24 of different frequencies can also produce coupled resonance, thereby widening the sound absorption band of the noise reduction module 22, thereby achieving a greater degree of broadband absorption, significantly reducing noise, and improving the use effect of the duct machine 100.

[0084] According to some embodiments of the present invention, at least two resonance cavities 24 in each noise reduction module 22 have different numbers of communicating holes 25. This allows the natural frequencies of at least two resonance cavities 24 to be different, thereby broadening the sound absorption frequency band of the noise reduction module 22 and improving the sound absorption effect.

[0085] The duct unit 100 according to the second embodiment of the present invention comprises the silencer pipe 20 according to the first embodiment of the present invention.

[0086] According to the duct air conditioner 10 of the embodiment of the present invention, the silencer pipe 20 of the first embodiment is provided, thereby improving the overall performance of the duct air conditioner 100.

[0087] For example Figure 1-Figure 3 As shown, in some specific embodiments of the present invention, the duct machine 100 also includes a hanger 30, a bracket 40 and a locking assembly 50, and a lifting ear is formed on the main body 10. Specifically, the bracket 40 includes a connecting plate and a mounting plate, and the connecting plate and the mounting plate are both formed in an "L" shape, wherein a locking through-hole is formed on the connecting plate, and the locking assembly 50 passes through the locking through-hole to connect the connecting plate and the muffler 20; the connecting plate is connected to the side of the mounting plate close to the main body, and a mounting hole is formed on the connecting plate, and a fastener passes 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 plate body to form an extension portion, and a mounting groove is formed on the extension portion. The hanger 30 passes through the mounting groove and fits in the lifting ear for fixed installation of the duct machine 100.

[0088] Reference below Figure 1-Figure 9 An air duct machine 100 according to a specific embodiment of the present invention is described.

[0089] Reference Figure 1 The duct machine 100 includes a main body 10, a suspension rod 30, a bracket 40 and a muffler 20, wherein the muffler 20 is connected to the main body 10 through the bracket 40, and the bracket 40 is connected to the main body 10 through a fastener. The main body 10 has an air outlet 11, and the muffler 20 is connected to the air outlet 11 of the main body 10. The inner side of the muffler 20 defines an air flow channel 21, and the air flow enters the air flow channel 21 through the air outlet 11 of the main body 10.

[0090] Specifically, a lifting ear is also formed on the main body 10, and the bracket 40 includes a connecting plate and a mounting plate, and the connecting plate and the mounting plate are both formed in an "L" shape, wherein a locking through hole is formed on the connecting plate, 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 close to the main body, and a mounting hole is formed on the connecting plate. The fastener passes 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 plate body to form an extension portion, and a mounting groove is formed on the extension portion. The hanging rod 30 passes through the mounting groove and fits in the lifting ear for fixed installation of the duct machine 100.

[0091] Specifically, the silencer 20 includes a plurality of noise reduction modules 22 , which are spliced ​​together to enclose the silencer 20 . The noise reduction modules 22 have a resonance cavity 24 and a connecting hole 25 connected to the resonance cavity 24 . The resonance 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 and an extension tube 26. The outer plate and the inner plate are arranged at intervals along the thickness direction of the noise reduction module 22. The partition 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 resonance cavities 24. The 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 arranged in the resonance cavity 24, and the upper end surface of the extension tube 26 is flush with the upper end surface of the inner plate. The extension tube 26 and the resonance cavity 24 together form a Helmholtz resonance silencing structure. A plurality of Helmholtz resonance silencing structures together form a plurality of noise reduction modules 22.

[0093] The silencer pipe 20 in this embodiment is composed of 100 Helmholtz resonance silencer structures. The natural frequencies of the multiple Helmholtz resonance silencer structures are different, and the sound absorption frequency bands are different. By adjusting the position layout, the multiple resonance cavities 24 can be coupled to resonate to broaden the sound absorption frequency band, and then they can act on the noise frequency peak parts of the duct machine 100 respectively.

[0094] For example Fig. 9 As shown, the sound absorption and noise reduction effect of the duct air conditioner 100 with the above-mentioned silencer 20 in this embodiment is simulated, and at the same time, the sound absorption and noise reduction effect of the duct air conditioner 100 without the silencer 20 in this embodiment is simulated, and the sound absorption and noise reduction effects of the two structures of the duct air conditioner 100 are compared. The experiment shows that the peak value of the noise frequency of the duct air conditioner 100 is 300-1800Hz, so the sound absorption bandwidth of the silencer 20 can be set at 300-1800Hz, and from Fig. 9It is concluded that by providing the above-mentioned silencer 20, the sound absorption and noise reduction effect of the duct air conditioner 100 is improved in multiple sound wave frequency bands; at the same time, at the design frequency band of 300-1800 Hz, under the conditions of the same duct air conditioner 100 profile and air volume, the use of the silencer 20 of this embodiment can reduce noise by 6 dB.

[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, and the interior of the noise reduction pipe section 23 forms an air flow channel 21. The cross-section of the air flow 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] The 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 and connected to the periphery of the muffler 20 inlet. The two third modules 223 are perpendicular to the air outlet module, and are arranged at both ends of the air inlet outlet in the width direction and connected to the periphery of the muffler 20 outlet. The inlet of the air inlet is formed between the two second modules 222. The two third modules 223 form the outlet of the air inlet, and the dimensions of the inlet and outlet are consistent with the dimensions of the air outlet 11 of the main body 10, and the width dimension of the air inlet is slightly larger than the width dimension of the air outlet 11. In other words, the cross-sectional area of ​​the airflow channel 21 in this embodiment increases first and then decreases, and in the air outlet direction, the cross-section of the airflow channel 21 forms a rectangle.

[0098] The fourth module 224 is arranged in the middle of the air flow channel 21 in the width direction. The side of the fourth module 224 arranged toward the air outlet 11 is formed into a curved surface protruding toward the air outlet 11, which can be used for guiding flow and preventing the generation of vortices.

[0099] Furthermore, the muffler 20 satisfies:

[0100]

[0101] Wherein, t is the transmission coefficient of the muffler 20; k is the number of cycles per unit length in the direction of sound wave propagation; S 12 is the cross-sectional area of ​​the inlet of the air flow channel 21, S 21 is the cross-sectional area of ​​the remaining positions of the air flow channel 21 except the inlet and the outlet; L2 is the distance between the second module 222 and the third module 223.

[0102] Furthermore, experimental calculations show that, in the length direction of the muffler 20, the spacing between the second module 222 and the third module 223 is 1 / 4 of the wavelength of the sound wave, and the sound absorption effect is optimal.

[0103] According to the duct air conditioner 100 of the embodiment of the present invention, by setting the silencer 20 of the first aspect embodiment, which is spliced ​​and surrounded by multiple noise reduction modules 22, the sound absorption effect of the silencer 20 can be increased, and the air outlet noise of the duct air conditioner 100 can be reduced, thereby improving the user experience of the duct air conditioner 100; at the same time, the silencer 20 can also be designed according to the number of noise reduction modules 22 of different models and installation spaces for flexible assembly, thereby increasing the versatility of the silencer 20 and improving the market competitiveness of the duct air conditioner 100.

[0104] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0105] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0106] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0107] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

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

Claims

1. A muffler, characterized in that: The silencer pipe includes a plurality of noise reduction modules, which are spliced ​​and enclosed to form the silencer pipe. The inner side of the silencer pipe defines an air flow channel. The noise reduction module has a resonance cavity and a connecting hole connected to the resonance cavity. The resonance cavity is connected to the air flow channel through the connecting hole.

2. The muffler according to claim 1, characterized in that: Along the air flow direction of the air flow channel, the cross-sectional area of ​​at least a portion of the air flow channel increases.

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

4. The muffler according to claim 1, characterized in that: A cavity recessed radially outward is formed on the wall surface of the airflow channel.

5. The muffler pipe according to claim 1, characterized in that: The muffler pipe comprises at least one noise reduction pipe section, and a plurality of the noise reduction pipe sections are sequentially connected along the length direction of the muffler pipe. At least part of the multiple noise reduction modules is formed into a first module, and the multiple first modules are connected end to end along the circumference of the muffler pipe to form the noise reduction pipe section.

6. The muffler pipe according to claim 5, characterized in that: Part of the plurality of noise reduction modules forms a second module, which is arranged perpendicular to the air outlet direction and connected to the periphery of the inlet of the muffler pipe to block a partial cross-section of the inlet of the muffler pipe.

7. The muffler according to claim 6, characterized in that: Part of the multiple noise reduction modules forms a third module, and the third module is arranged perpendicular to the air outlet direction and connected to the periphery of the outlet of the muffler pipe to block a partial cross-section of the outlet of the muffler pipe.

8. The muffler pipe according to claim 7, characterized in that: The cross section of the airflow channel is rectangular, a plane perpendicular to the length direction of the airflow channel is set as a first plane, a first direction and a second direction in the first plane are respectively a width direction and a height direction of the airflow channel, Among them, 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 at least one end of the inlet of the airflow channel in the first direction, and the third module blocks the cross-section of at least one end of the outlet of the airflow channel in the first direction.

9. The muffler pipe according to claim 7, characterized in that: The muffler meets the following requirements: Wherein, t is the transmission coefficient of the muffler; k is the number of cycles per unit length in the direction of sound wave propagation; S 12 is the cross-sectional area of ​​the inlet of the air flow channel, S 21 is the cross-sectional area of ​​the air flow channel except the inlet and outlet; L2 is the distance between the second module and the third module.

10. The muffler pipe according to claim 9, characterized in that: In the length direction of the muffler, the distance between the second module and the third module is 1 / 4 of the wavelength of the sound wave.

11. The muffler pipe according to claim 7, characterized in that: Some of the multiple noise reduction modules form a fourth module, and the fourth module is arranged parallel to the length direction of the silencer pipe. The multiple fourth modules are arranged in the silencer pipe and divide the air flow channel into multiple sub-air ducts. The multiple sub-air ducts are arranged in a plane perpendicular to the length direction of the silencer pipe.

12. The muffler pipe according to claim 11, characterized in that: 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 is disposed away from the outlet of the airflow channel, and the windward surface is a curved surface protruding away from the outlet.

13. The muffler pipe according to any one of claims 1 to 12, characterized in that: The noise reduction module includes: an outer plate portion, an inner plate portion and a partition portion, 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 the resonance cavities, and the connecting hole is formed on the inner plate portion.

14. The muffler pipe according to claim 1, characterized in that: A plurality of the noise reduction modules are detachably connected.

15. The muffler 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 communication hole and extends along the central axis of the communication hole, and is disposed in the resonance cavity.

16. The muffler pipe according to claim 1, characterized in that: Each of the noise reduction modules has a plurality of the resonance cavities, and each of the resonance cavities is connected to the air flow channel through at least one of the communication holes.

17. The muffler pipe according to claim 16, characterized in that: The numbers of the communicating holes in at least two of the resonance cavities in each of the noise reduction modules are different.

18. A duct air conditioner, comprising a main body and a silencer according to any one of claims 1 to 17, wherein the main body has an air inlet and an air outlet; and the silencer is connected to the air inlet and / or the air outlet.

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