Noise reduction structure, power electronic equipment and fan

Abstract

The noise reduction structure comprises at least one noise reduction unit, each noise reduction unit is provided with a rectification channel and a noise reduction cavity which are arranged adjacently, the rectification channel penetrates through the noise reduction structure and can be ventilated, and the noise reduction cavity is arranged in a sealed mode along the two ends of the extension direction of the rectification channel. A communicating opening is formed in the side wall of the silencing cavity and can communicate with the silencing cavity and the rectifying channel. Through the technical scheme provided by the invention, the problem that the noise reduction effect of a noise reduction structure in the prior art is relatively poor can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of noise reduction, and in particular to a noise reduction structure, a power electronic device and a fan. Background Art

[0002] When energy storage AC units, photovoltaic inverters, charging piles and other devices are working, they will generate a lot of heat, which needs to be dissipated by fans. In order to improve the heat dissipation effect, multiple high-speed fans are usually used to work at the same time, but this will generate a lot of noise, which will cause serious noise pollution and affect the physical and mental health of workers.

[0003] The main noise source of the fan is aerodynamic noise, and the aerodynamic noise of the fan is mainly divided into discrete noise and broadband noise. The discrete noise of the fan is caused by the blades beating the surrounding gas medium during high-speed rotation, causing the surrounding gas pressure pulsation. The broadband noise of the fan is mainly caused by the eddy current noise caused by the airflow pressure pulsation caused by the turbulent boundary layer of the blades and its shedding.

[0004] In order to reduce the aerodynamic noise of the fan, in the prior art, a noise reduction structure such as a honeycomb panel is usually provided at the air inlet of the fan. However, the honeycomb panel mainly utilizes the principle of rectification noise reduction to eliminate the broadband noise of the fan during operation, so that the noise reduction structure such as the honeycomb panel cannot effectively reduce the discrete noise of the fan, and thus the noise reduction effect of the noise reduction structure in the prior art is poor. Utility Model Content

[0005] The utility model provides a noise reduction structure, a power electronic device and a fan, so as to solve the problem that the noise reduction effect of the noise reduction structure in the prior art is poor.

[0006] According to one aspect of the utility model, a noise reduction structure is provided, which includes at least one noise reduction unit, each of which has a rectifying channel and a silencer cavity arranged adjacent to each other, the rectifying channel runs through the noise reduction structure, the rectifying channel can be ventilated, the silencer cavity is sealed at both ends along the extension direction of the rectifying channel, and a connecting port is arranged on the side wall of the silencer cavity, and the connecting port can connect the silencer cavity and the rectifying channel.

[0007] Furthermore, the noise reduction structure includes a plurality of noise reduction units, and the plurality of noise reduction units are distributed in an array.

[0008] Furthermore, two adjacent noise reduction units are staggered along the extension direction of the rectifying channel; and / or, the rectifying channel and the silencer chamber in the same noise reduction unit are staggered along the extension direction of the rectifying channel; and / or, the rectifying channel or the silencer chamber in a noise reduction unit is staggered with the rectifying channel or the silencer chamber in another noise reduction unit along the extension direction of the rectifying channel.

[0009] Furthermore, the noise reduction unit includes a plurality of rectifying channels and a plurality of silencing cavities, and the plurality of rectifying channels and the plurality of silencing cavities are regularly arranged or randomly arranged.

[0010] Further, each noise reduction unit includes a plurality of rectifying channels, which are arranged around the periphery of the silencer chamber, and a plurality of connecting ports are arranged on the side wall of the silencer chamber. One rectifying channel is arranged corresponding to at least one connecting port, and the rectifying channel is connected to the silencer chamber through the corresponding connecting port; or, each noise reduction unit includes a plurality of silencer chambers, which are arranged around the periphery of the rectifying channel, and the connecting ports of the plurality of silencer chambers are all connected to the rectifying channel.

[0011] Furthermore, a partition is provided in the silencing chamber to divide the silencing chamber into a plurality of chambers, and the chambers are connected with the rectification channel through a connecting port on the side wall of the silencing chamber.

[0012] Furthermore, an opening is provided on the partition to connect two adjacent chambers, and / or a sound-absorbing material is provided in the silencing chamber.

[0013] Furthermore, the noise reduction structure also includes a grille plate, on which a plurality of first meshes and a plurality of second meshes are arranged, the first meshes and the second meshes are both through holes, the first meshes form a rectifying channel, both ends of the second meshes are provided with sealing plates, the sealing plates can seal the second meshes, the second meshes and the sealing plates cooperate to form a silencer cavity, and a connecting port is provided on the side wall of the second mesh.

[0014] Furthermore, the end surface of the grid plate is a plane structure or a curved structure.

[0015] According to one aspect of the utility model, a power electronic device is provided, which includes a ventilation channel and the noise reduction structure provided above, wherein the noise reduction structure is arranged in the ventilation channel, the rectification channel of the noise reduction structure is connected to the ventilation channel, and the noise reduction structure is arranged at the air inlet of the ventilation channel, and / or the air outlet of the ventilation channel, and / or on the inner wall of the ventilation channel.

[0016] Furthermore, the power electronic device comprises a plurality of noise reduction structures, the plurality of noise reduction structures are stacked and arranged along the extension direction of the rectifying channel, and at least one of the plurality of noise reduction structures is arranged correspondingly to the rectifying channel.

[0017] According to another aspect of the utility model, a fan is provided, comprising a fan, a fan frame and the noise reduction structure provided above, wherein the noise reduction structure and the fan are fixed on the fan frame at intervals along the axial direction of the fan frame.

[0018] By applying the technical solution of the utility model, during the ventilation process, the airflow can circulate in the rectifying channel, and part of the airflow can flow from the rectifying channel into the muffler chamber through the connecting port. In this way, when the airflow enters the rectifying channel, the rectifying channel can rectify the airflow, slow down the velocity gradient of the airflow, thereby reducing the generation of vortices, and effectively reducing broadband noise. At the same time, when the sound waves of the airflow propagate in the rectifying channel and pass through the connecting port, the sound waves will enter the muffler chamber through the connecting port. Due to the local resonance of the muffler chamber, the gas in the connecting port and the muffler chamber moves back and forth under the action of the sound waves, eliminating the sound waves of specific frequencies. Since discrete noise has a specific frequency, the above structure can effectively reduce discrete noise. At the same time, when the sound wave passes through the connecting port, due to the friction and damping of the inner wall of the connecting port, a considerable part of the sound energy is lost due to heat consumption. In addition, the muffler chamber filled with gas has the characteristic of hindering the pressure change from the connecting port. Due to the combined effect of these factors, the noise can be effectively reduced. With such arrangement, the local resonance effect of the silencing cavity and the rectification effect of the rectification channel are coupled with each other, and the noise reduction structure can effectively reduce broadband noise and discrete noise, thereby improving the noise reduction effect of the noise reduction structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of the structure of the noise reduction structure provided in the first embodiment of the utility model is shown;

[0021] Figure 2 Shows Figure 1 A partial enlarged view of the middle A;

[0022] Figure 3 A schematic diagram of the structure of a noise reduction unit provided in the first embodiment of the present utility model is shown;

[0023] Figure 4 A schematic diagram showing the structure of the coordination between the rectifying channel and the muffler cavity provided in the first embodiment of the utility model is shown;

[0024] Figure 5 A schematic diagram of the structure of a noise reduction unit provided in the second embodiment of the present utility model is shown;

[0025] Figure 6 A schematic diagram showing the structure of another noise reduction unit provided in the second embodiment of the present utility model is shown;

[0026] Figure 7 The schematic diagram of the structure of the noise reduction structure provided in the third embodiment of the present utility model is shown;

[0027] Figure 8 A schematic diagram of the structure of the noise reduction structure provided by the fourth embodiment of the present utility model is shown;

[0028] Fig. 9 The structure diagram of the power electronic device provided by the fifth embodiment of the present utility model is shown;

[0029] Fig.10 It shows a schematic structural diagram of two noise reduction structures superimposed on each other provided in Embodiment 5 of the present utility model;

[0030] Fig.11 It shows a schematic structural diagram of the superposition of three noise reduction structures provided in the fifth embodiment of the present utility model;

[0031] Fig.12 A structural schematic diagram of a fan provided in Embodiment 6 of the present utility model is shown.

[0032] The above drawings include the following reference numerals:

[0033] 10. Noise reduction unit; 11. Rectification channel; 12. Silence chamber; 121. Communication port; 122. Chamber;

[0034] 20. Partition; 21. Opening;

[0035] 31. Grid plate; 32. Blocking plate;

[0036] 110, ventilation channel; 120, housing; 130, fixing frame;

[0037] 210. Fan; 220. Fan frame. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means a limitation on the utility model and its application or use. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0039] like Figures 1 to 4As shown, the first embodiment of the utility model provides a noise reduction structure, the noise reduction structure includes at least one noise reduction unit 10, each noise reduction unit 10 has a rectifying channel 11 and a silencer cavity 12 arranged adjacent to each other, the rectifying channel 11 runs through the noise reduction structure, the rectifying channel 11 can be ventilated, the silencer cavity 12 is sealed at both ends along the extension direction of the rectifying channel 11, and a connecting port 121 is arranged on the side wall of the silencer cavity 12, and the connecting port 121 can connect the silencer cavity 12 and the rectifying channel 11.

[0040] By applying the technical solution of the present application, during the ventilation process, the airflow can circulate in the rectifying channel 11, and part of the airflow can flow from the rectifying channel 11 into the muffler chamber 12 through the connecting port 121. In this way, when the airflow enters the rectifying channel 11, the rectifying channel 11 can rectify the airflow, slow down the velocity gradient of the airflow, thereby reducing the generation of vortices, and effectively reducing the broadband noise generated by the fan. At the same time, when the sound waves of the airflow propagate in the rectifying channel 11 and pass through the connecting port 121, the sound waves will enter the muffler chamber through the connecting port 121. Due to the local resonance of the muffler chamber 12, the gas in the connecting port 121 and the muffler chamber 12 moves back and forth under the action of the sound waves, eliminating the sound waves of a specific frequency. Since discrete noise has a specific frequency, the above structure is adopted to effectively reduce discrete noise. At the same time, when the sound wave passes through the connecting port 121, due to the friction and damping of the inner wall of the connecting port 121, a considerable part of the sound energy is lost due to heat consumption. In addition, the gas-filled silencer chamber 12 has the characteristic of hindering the pressure change from the communication port 121. Due to the combined effect of these factors, the noise can be effectively reduced. In this way, the local resonance effect of the silencer chamber 12 and the rectification effect of the rectification channel 11 are coupled with each other, and the noise reduction structure can better reduce broadband noise and discrete noise, thereby improving the noise reduction effect of the noise reduction structure.

[0041] Optionally, the ratio of the number of the rectifying channels 11 and the number of the silencer chambers 12 in the noise reduction unit 10 can be 1:1, 1:2, 1:6 or 6:1, or other ratios, which can be designed by the staff according to the needs. That is, at a location with a small air volume, the ratio of the silencer chamber 12 can be appropriately increased, and at a location with a large air volume, the ratio of the silencer chamber 12 can be appropriately reduced. Such a setting can ensure the smoothness of gas circulation.

[0042] The noise reduction structure includes a plurality of noise reduction units 10, which are arranged in an array. This arrangement facilitates the arrangement of the noise reduction structure, and can also increase the noise reduction range of the noise reduction structure, improve the noise reduction effect of the noise reduction structure, and facilitate the staff to arrange the noise reduction structure on the device that needs noise reduction.

[0043] Optionally, the plurality of noise reduction units 10 may be distributed in a planar array or a curved array.

[0044] Specifically, when a plurality of noise reduction units 10 are distributed in a planar array, the end face of the noise reduction structure may be a square structure, a circular structure, or a ring structure, and the staff can make their own selection according to their needs.

[0045] Furthermore, when a plurality of noise reduction units 10 are distributed in a curved array, the noise reduction structure may be a hyperbolic structure, a special-shaped surface structure, or an annular surface structure, and the staff can select it according to their needs.

[0046] The volume of the silencing cavity 12 in different noise reduction structures can be set to different sizes, so that sound waves of different frequencies can be eliminated, thereby improving the effect of the noise reduction structure in eliminating discrete noise. In addition, the staff can change the wall thickness of the silencing cavity 12, thereby changing the depth of the communication port 121, so that sound waves of different frequencies can be eliminated at the same time.

[0047] Specifically, the noise reduction unit 10 includes a plurality of rectifying channels 11 and a plurality of silencing chambers 12, and the plurality of rectifying channels 11 and the plurality of silencing chambers 12 are arranged regularly or randomly. That is, the rectifying channels 11 and the silencing chambers 12 in the noise reduction unit 10 can be regularly distributed or irregularly distributed, and the staff can choose independently according to the needs. Such a setting can improve the use occasions of the noise reduction unit, and the staff can arrange the plurality of rectifying channels 11 and the plurality of silencing chambers 12 in the noise reduction unit 10 according to the specific structure of the device that needs to reduce noise.

[0048] Optionally, when the noise reduction structure includes multiple noise reduction units 10, all of them may be regularly distributed noise reduction units 10; all of them may be irregularly distributed noise reduction units 10; some of them may be regularly distributed noise reduction units 10 and the rest may be irregularly distributed noise reduction units 10.

[0049] Optionally, when multiple noise reduction units 10 are arranged in an array, the multiple noise reduction units 10 may be arranged regularly; the multiple noise reduction units may also be arranged randomly; or some noise reduction units 10 may be arranged randomly and the rest of the noise reduction units 10 may be arranged regularly. The staff may design independently according to the requirements.

[0050] Optionally, each noise reduction unit 10 includes two silencer cavities 12 and two rectifying channels 11, the two silencer cavities 12 are arranged in one row, the two rectifying channels 11 are arranged in another row, the two silencer cavities 12 are arranged in one-to-one correspondence with the two rectifying channels 11, and the silencer cavities 12 are connected to the corresponding rectifying channels 11 through a connecting port 121. Among them, a connecting port 121 can also be set between two adjacent silencer cavities 12 for communication, or two adjacent silencer cavities 12 can be set independently. A through hole can also be set between two adjacent rectifying channels 11 for communication.

[0051] Each noise reduction unit 10 may include a plurality of silencing chambers 12, and the plurality of silencing chambers 12 are arranged around the outer periphery of the rectifying channel 11, and the communication ports 121 of the plurality of silencing chambers 12 are all connected to the rectifying channel 11. Such an arrangement can improve the effect of eliminating discrete noise by the noise reduction unit 10. Moreover, when the noise reduction structure includes a plurality of the above-mentioned noise reduction units 10, the plurality of noise reduction units 10 can be arranged regularly to reduce the processing difficulty of the staff.

[0052] Specifically, in the present embodiment, each noise reduction unit 10 includes a plurality of rectifying channels 11, and the plurality of rectifying channels 11 are arranged around the outer periphery of the muffler chamber 12. The side wall of the muffler chamber 12 is provided with a plurality of connecting ports 121. One rectifying channel 11 is arranged corresponding to at least one connecting port 121, and the rectifying channel 11 is connected to the muffler chamber 12 through the corresponding connecting port 121. Such an arrangement can ensure the smoothness of the airflow, and at the same time ensure the rectifying effect of the noise reduction unit 10, so as to further enhance the effect of the noise reduction structure in eliminating broadband noise. Moreover, when the noise reduction structure includes a plurality of the above-mentioned noise reduction units 10, the plurality of noise reduction units 10 can be arranged regularly to reduce the processing difficulty of the staff.

[0053] Furthermore, a sound-absorbing material is arranged in the silencing cavity 12. With such an arrangement, the silencing cavity 12 can eliminate low- and medium-frequency noises, and the sound-absorbing material can eliminate high- and medium-frequency noises, which can further enhance the resonance silencing effect of the silencing cavity 12, thereby improving the noise reduction effect of the noise reduction structure. Moreover, when the airflow flows to the connecting port 121, secondary noise will be generated, and the sound-absorbing material can avoid the generation of secondary noise.

[0054] The noise reduction structure further includes a grille plate 31. The grille plate 31 is provided with a plurality of first meshes and a plurality of second meshes, both of which are through holes, and the first mesh forms a rectifying channel 11. Both ends of the second mesh are provided with a blocking plate 32, which can seal the second mesh, and the second mesh cooperates with the blocking plate 32 to form a muffler cavity 12, and a connecting port 121 is provided on the side wall of the second mesh. With such a configuration, the noise reduction structure is simple in structure, easy to process, and convenient to install.

[0055] The blocking plate 32 is a rigid structure, so that the silencer cavity 12 can better eliminate sound waves of a specific frequency, thereby effectively reducing the discrete noise generated by the rotation of the fan.

[0056] Specifically, the blocking plate 32 may be made of a steel plate or a PC or PE plastic material.

[0057] Specifically, the end surface of the grid plate 31 is a flat structure or a curved structure. In this way, the noise reduction structure can be installed at different positions, and the staff can select the specific structure of the grid plate 31 according to the needs.

[0058] Optionally, when the end surface of the grid plate 31 is a curved structure, the grid plate may be a hemispherical structure or a hyperbolic structure.

[0059] Optionally, the end surface of the grid plate 31 may also be a conical structure or a cubic structure.

[0060] Further, the cross section of the rectifying channel 11 is a circular structure or a square structure; and / or, the cross section of the muffler chamber 12 is a circular structure or a square structure. Optionally, the cross sections of the rectifying channel 11 and the muffler chamber 12 can be a circular structure, a hexagonal structure, a rectangular structure or a trapezoidal structure. Among them, the staff can independently select the design according to the needs.

[0061] Optionally, the volume of the rectifying channel 11 is the same as that of the muffler chamber 12 , or the volume of the rectifying channel 11 is larger than that of the muffler chamber 12 , or the volume of the rectifying channel 11 is smaller than that of the muffler chamber 12 .

[0062] like Figure 5 and Figure 6 As shown, the second embodiment of the utility model provides a noise reduction structure, which is different from the first embodiment in that two adjacent noise reduction units 10 are staggered along the extension direction of the rectifying channel 11. And / or, the rectifying channel 11 and the silencer cavity 12 in the same noise reduction unit 10 are staggered along the extension direction of the rectifying channel 11. And / or, the rectifying channel 11 or the silencer cavity 12 in the noise reduction unit 10 is staggered with the rectifying channel 11 or the silencer cavity 12 in another noise reduction unit 10 along the extension direction of the rectifying channel 11.

[0063] Such an arrangement can improve the application scope of the noise reduction structure, and the staff can design the structure of the noise reduction structure according to the needs.

[0064] like Figure 7 As shown, the third embodiment of the present invention provides a noise reduction structure, which is different from the first embodiment in that a partition 20 is provided in the silencing cavity 12 to divide the silencing cavity 12 into a plurality of chambers 122, and each chamber 122 is connected to the corresponding rectifying channel 11 through a connecting port 121 on the side wall of the silencing cavity 12. In this way, each chamber 122 and the corresponding connecting port 121 together form a sufficient silencing unit, which can eliminate noises of different frequencies and further improve the noise reduction effect of the noise reduction structure.

[0065] Specifically, when a partition 20 is provided in the muffler chamber 12 , the partition 20 can extend along the extension direction of the rectifying channel 11 , or the extension direction of the partition 20 can be perpendicular to or have an angle with the extension direction of the rectifying channel 11 .

[0066] Furthermore, when a plurality of partitions 20 are provided in the silencer chamber 12, the plurality of partitions 20 can be arranged parallel to each other, and the partitions 20 can extend along the extension direction of the rectifying channel 11, or the extension direction of the partitions 20 can be arranged perpendicular to the extension direction of the rectifying channel 11 or have an angle therebetween.

[0067] Optionally, multiple partitions 20 may also cross each other, such as multiple partitions 20 crossing in a "M" shape, or in a "X" shape.

[0068] The volumes of different chambers 122 may be different, and the thicknesses of the partitions 20 may also be different, so that noises of different frequencies can be eliminated, further improving the noise reduction effect of the noise reduction structure.

[0069] Specifically, each of the multiple chambers 122 can be communicated with the adjacent rectifying channels 11 through the communication ports 121 .

[0070] like Figure 8 As shown, the fourth embodiment of the utility model provides a noise reduction structure, which is different from the third embodiment in that an opening 21 is provided on the partition plate 20 to connect two adjacent chambers 122. In this way, when the two adjacent chambers 122 are connected, discrete noise of a specific frequency can also be eliminated, so that the frequency of the noise that can be eliminated by the noise reduction structure can be further widened, thereby ensuring the noise reduction effect of the noise reduction structure.

[0071] Optionally, the partitions between two adjacent chambers 122 may all be provided with openings 21 , or some of the partitions between two adjacent chambers 122 may be provided with openings 21 , while the rest may not be provided with openings 21 .

[0072] Optionally, the plurality of chambers 122 may be connected to adjacent rectifying channels 11 through the connecting openings 121 .

[0073] Optionally, an opening 21 is provided on the partition between two adjacent chambers 122 to achieve mutual communication, but one of the chambers 122 is also connected to the corresponding rectifying channel 11 through the connecting port 121, and the other chamber 122 is only connected to the chamber 122 through the opening 21.

[0074] like Fig. 9As shown, the fifth embodiment of the utility model provides a power electronic device, which includes a ventilation channel 110 and the noise reduction structure provided above, the noise reduction structure is arranged in the ventilation channel 110, and the rectifying channel 11 of the noise reduction structure is connected to the ventilation channel 110. With such arrangement, the noise reduction structure can effectively eliminate the broadband noise and discrete noise in the ventilation channel 110. Specifically, the ventilation device includes a housing 120, the housing has the ventilation channel 110, and the housing 120 is provided with an air inlet and an air outlet connected to the ventilation channel 110, and the noise reduction structure can be arranged at the air inlet, the air outlet or the inner wall of the ventilation channel 110.

[0075] Optionally, the power electronic device may be an inverter, a charging pile, a converter, a frequency converter, a transformer, a battery compartment or the like.

[0076] Furthermore, the power electronic device includes a plurality of noise reduction structures, and the plurality of noise reduction structures are stacked and arranged along the extension direction of the rectifying channel 11 , and at least one of the plurality of noise reduction structures is arranged correspondingly to the rectifying channel 11 .

[0077] like Fig.10 As shown, the power electronic device includes two noise reduction structures. Such an arrangement can ensure the ventilation effect of the noise reduction structure, and the superposition of the rectification channels 11 of multiple noise reduction structures can achieve a multi-stage rectification effect, thereby further improving the noise reduction effect of the noise reduction structure.

[0078] Optionally, multiple noise reduction structures can be staggered, that is, the rectifying channel 11 can be arranged corresponding to the silencer cavity 12, as long as at least one rectifying channel 11 in the multiple noise reduction structures is arranged correspondingly, that is, multiple noise reduction units 10 can be ventilated after being stacked.

[0079] Optionally, a plurality of rectification channels 11 of noise reduction structures are provided correspondingly, and a plurality of silencing cavities 12 of noise reduction structures are provided correspondingly.

[0080] Furthermore, the silencer cavities 12 of the multiple noise reduction structures can be set to different structures or different sizes, or the side walls of the silencer cavities 12 can be of different thicknesses. This can change the resonance frequency of the silencer cavities 12 to form a resonance band with a certain bandwidth, thereby achieving sound absorption and noise reduction within a certain wide frequency range.

[0081] like Fig.11 As shown, the power electronic device includes three noise reduction structures. Such an arrangement can ensure the ventilation effect of the noise reduction structure, and the superposition of the rectification channels 11 of multiple noise reduction structures can achieve a multi-stage rectification effect, thereby further improving the noise reduction effect of the noise reduction structure.

[0082] Optionally, multiple noise reduction structures can be staggered, that is, the rectifying channel 11 can be arranged corresponding to the silencer cavity 12, as long as at least one rectifying channel 11 in the multiple noise reduction structures is arranged correspondingly, that is, multiple noise reduction units 10 can be ventilated after being stacked.

[0083] Optionally, a plurality of rectification channels 11 of noise reduction structures are provided correspondingly, and a plurality of silencing cavities 12 of noise reduction structures are provided correspondingly.

[0084] Furthermore, when multiple noise reduction units 10 are stacked along the extension direction of the rectification channel 11, through holes can be set on two adjacent sealing plates 32, so that the two adjacent sealing plates 32 are connected to each other, that is, the two adjacent silencer chambers 12 are connected to each other, which can also change the resonance frequency of the silencer chamber 12.

[0085] In other embodiments, the noise reduction structure includes four or more noise reduction units 10, and the staff can choose according to their needs. That is, in a location with a large air volume, the staff can increase the number of layers of the noise reduction structure accordingly. In addition, the resonance frequencies of the silencing cavities 12 of adjacent layers can be different, so that a resonance band with a certain bandwidth can be formed, thereby achieving sound elimination and noise reduction in a wider frequency range.

[0086] Furthermore, the power electronic device further comprises a fixing frame 130 , which is sleeved on the grille plate 31 , so that the grille plate 31 is fixed in the ventilation passage 110 through the fixing frame 130 , which has a simple structure and is easy to operate.

[0087] like Fig.12 As shown, the sixth embodiment of the utility model provides a fan, which includes a fan 210, a fan frame 220 and the noise reduction structure provided above, and the noise reduction structure and the fan 210 are fixed on the fan frame 220 at intervals along the axial direction of the fan frame 220. Among them, the fan 210 has an air inlet side and an air outlet side that are relatively arranged, the noise reduction structure can be arranged on the air inlet side or the air outlet side, and the airflow generated by the fan 210 can flow into the rectifying channel 11.

[0088] With such a configuration, after the airflow enters the rectifying channel 11, the rectifying channel 11 can rectify the airflow and slow down the velocity gradient of the airflow on the inlet and outlet sides, thereby reducing the generation of vortices on the inlet and outlet sides of the fan 210, thereby effectively reducing the broadband noise generated by the fan, and when the sound waves generated by the fan 210 propagate in the rectifying channel 11 and pass through the connecting port 121, the local resonance of the silencer chamber 12 will eliminate the sound waves of a specific frequency, thereby effectively reducing the discrete noise generated by the rotation of the fan 210. With such a configuration, the local resonance of the silencer chamber 12 and the rectifying effect of the rectifying channel 11 are coupled with each other, and the noise reduction structure can better reduce broadband noise and discrete noise, thereby improving the noise reduction effect of the noise reduction structure, thereby ensuring the physical and mental health of the staff.

[0089] Furthermore, the fan further comprises a fixing frame 130, and the fixing frame 130 is sleeved on the grille plate 31, so that the grille plate 31 is fixed to the fan frame 220 through the fixing frame 130, which has a simple structure and is easy to operate.

[0090] Furthermore, the fan equipped with the above-mentioned noise reduction structure is arranged in the ventilation passage 110. Such an arrangement can further reduce the noise generated by the fan, thereby reducing noise pollution.

[0091] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0092] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0093] In the description of the present utility model, it needs to be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present utility model; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0094] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0095] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the utility model.

[0096] The above description is only the preferred embodiment of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A noise reduction structure, characterized in that: The noise reduction structure comprises at least one noise reduction unit (10), each of the noise reduction units (10) having a rectifying channel (11) and a silencer chamber (12) arranged adjacent to each other, the rectifying channel (11) being arranged to penetrate the noise reduction structure, the rectifying channel (11) being ventilated, the silencer chamber (12) being sealed at both ends along the extension direction of the rectifying channel (11), a connecting port (121) being arranged on the side wall of the silencer chamber (12), the connecting port (121) being able to connect the silencer chamber (12) and the rectifying channel (11).

2. The noise reduction structure according to claim 1, characterized in that: The noise reduction structure comprises a plurality of the noise reduction units (10), and the plurality of the noise reduction units (10) are distributed in an array.

3. The noise reduction structure according to claim 2, characterized in that: Two adjacent noise reduction units (10) are arranged in a staggered manner along the extension direction of the rectifying channel (11); and / or the rectifying channel (11) and the silencer cavity (12) in the same noise reduction unit (10) are arranged in a staggered manner along the extension direction of the rectifying channel (11); and / or the rectifying channel (11) or the silencer cavity (12) in the noise reduction unit (10) is arranged in a staggered manner with the rectifying channel (11) or the silencer cavity (12) in another noise reduction unit (10) along the extension direction of the rectifying channel (11).

4. The noise reduction structure according to claim 1, characterized in that: The noise reduction unit (10) comprises a plurality of the rectifying channels (11) and a plurality of the silencing chambers (12), and the plurality of the rectifying channels (11) and the plurality of the silencing chambers (12) are regularly arranged or randomly arranged.

5. The noise reduction structure according to claim 1, characterized in that: Each of the noise reduction units (10) comprises a plurality of the rectifying channels (11), the plurality of the rectifying channels (11) being arranged around the outer periphery of the muffler cavity (12), a plurality of the communicating ports (121) being arranged on the side wall of the muffler cavity (12), one of the rectifying channels (11) being arranged corresponding to at least one of the communicating ports (121), and the rectifying channel (11) being connected to the muffler cavity (12) via the corresponding communicating port (121); Alternatively, each of the noise reduction units (10) comprises a plurality of the silencer chambers (12), the plurality of the silencer chambers (12) being arranged around the periphery of the rectifying channel (11), and the connecting openings (121) of the plurality of the silencer chambers (12) being connected to the rectifying channel (11).

6. The noise reduction structure according to claim 1, characterized in that: A partition (20) is provided in the muffler cavity (12) to divide the muffler cavity (12) into a plurality of chambers (122); the chambers (122) are connected to the rectifying channel (11) through a connecting port (121) on a side wall of the muffler cavity (12).

7. The noise reduction structure according to claim 6, characterized in that: The partition plate (20) is provided with an opening (21) to connect two adjacent chambers (122), and / or a sound absorbing material is provided in the silencer chamber (12).

8. The noise reduction structure according to claim 1, characterized in that: The noise reduction structure further comprises: a grille plate (31), the grille plate (31) being provided with a plurality of first mesh holes and a plurality of second mesh holes, the first mesh holes and the second mesh holes being through holes, the first mesh holes forming the rectifying channel (11), both ends of the second mesh holes being provided with sealing plates (32), the sealing plates (32) being capable of sealing the second mesh holes, the second mesh holes cooperating with the sealing plates (32) forming the silencing chamber (12), the connecting opening (121) being provided on the side wall of the second mesh holes.

9. The noise reduction structure according to claim 8, characterized in that: The end surface of the grid plate (31) is a plane structure or a curved structure.

10. A power electronic device, characterized in that: The power electronic device comprises a ventilation channel (110) and a noise reduction structure according to any one of claims 1 to 9, wherein the noise reduction structure is arranged in the ventilation channel (110), a rectification channel (11) of the noise reduction structure is connected to the ventilation channel (110), and the noise reduction structure is arranged at an air inlet of the ventilation channel (110), and / or an air outlet of the ventilation channel (110), and / or on an inner wall of the ventilation channel (110).

11. The power electronic device according to claim 10, characterized in that: The power electronic device comprises a plurality of noise reduction structures, the plurality of noise reduction structures are stacked and arranged along the extension direction of the rectifying channel (11), and at least one of the plurality of noise reduction structures is arranged corresponding to the rectifying channel (11).

12. A fan, characterized in that: The fan comprises a fan (210), a fan frame (220), and a noise reduction structure according to any one of claims 1 to 9, wherein the noise reduction structure and the fan (210) are fixed on the fan frame (220) at intervals along an axial direction of the fan frame (220).

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