Power conversion device and noise reduction device

Abstract

The utility model discloses power conversion equipment and a noise reduction device, and belongs to the technical field of new energy equipment. The power conversion equipment comprises a box body, an electronic device, a fan and a noise reduction device, the box body forms an equipment shell and a heat dissipation shell; the electronic device is arranged in the equipment shell; the noise reduction device comprises an air duct shell and a noise reduction structure, the air duct shell is provided with a first opening communicated with the heat dissipation shell and at least two second openings communicated with the outside, the first opening and the second openings are located on different wall surfaces, and the noise reduction structure is arranged in the air duct shell; the fan is installed in a heat dissipation channel formed by the heat dissipation shell and the air duct shell. According to the invention, sound energy pollution of heat dissipation devices such as a fan of the power conversion equipment can be reduced.

Description

Technical Field

[0001] This application belongs to the technical field of new energy equipment, and particularly relates to a power conversion device and a noise reduction device. Background Art

[0002] With the rapid development of the new energy industry, power conversion devices such as photovoltaic inverters are getting closer and closer to residential areas, and the sound energy of power conversion devices such as photovoltaic inverters has also become an index that people pay great attention to. At present, in order to better dissipate heat from the electronic devices in the power conversion device, heat dissipation devices such as fans are usually provided inside the power conversion device to dissipate heat from the electronic devices in the power conversion device through the heat dissipation devices such as fans. However, heat dissipation devices such as fans are prone to generate sound energy during operation, which has an adverse impact on the surrounding environment. Summary of the Utility Model

[0003] This application aims to solve at least one of the technical problems existing in the prior art. For this reason, this application provides a power conversion device and a noise reduction device to reduce the sound energy pollution of heat dissipation devices such as fans of the power conversion device.

[0004] In a first aspect, this application provides a power conversion device, including: a box body, electronic devices, a fan, and a noise reduction device; the box body forms a device shell and a heat dissipation shell; the electronic devices are arranged inside the device shell; the noise reduction device includes a duct shell and a noise reduction structure, the duct shell has a first opening communicating with the heat dissipation shell and at least two second openings communicating with the outside, the first opening and the second openings are located on different walls, and the noise reduction structure is arranged inside the duct shell; the fan is installed in the heat dissipation channel formed by the heat dissipation shell and the duct shell.

[0005] According to the power conversion device of this application, by arranging a noise reduction device outside the heat dissipation shell, the duct of the noise reduction device has a first opening communicating with the heat dissipation shell and at least two second openings communicating with the outside, and the first opening and the second openings are located on different walls. On the one hand, by arranging a plurality of second openings communicating with the outside, a plurality of air ducts can be formed, so as to change the outward propagation path of the fan noise, thereby achieving a certain noise reduction effect; on the other hand, by arranging a noise reduction structure inside the duct shell, the sound wave energy can be absorbed, further reducing the outward propagating sound energy.

[0006] According to an embodiment of this application, the second openings include two, and the two second openings are arranged oppositely and on the adjacent walls of the first opening.

[0007] According to an embodiment of this application, the heat dissipation shell includes an air inlet and an air outlet;

[0008] The first opening is in communication with the air outlet of the heat dissipation housing, or the first opening is in communication with the air inlet of the heat dissipation housing.

[0009] According to an embodiment of the present application, the noise reduction structure includes a sound absorption layer, and the sound absorption layer is disposed on the inner wall of the air duct housing.

[0010] According to an embodiment of the present application, the noise reduction structure includes at least one resonance cavity. The resonance cavity is disposed on the opposite wall surface of the wall surface where the first opening is located, and the ventilation hole of the resonance cavity faces the first opening.

[0011] According to an embodiment of the present application, there are a plurality of the resonance cavities, and the plurality of resonance cavities are arranged along the extending direction of the air duct housing. A spacing is provided between adjacent two of the resonance cavities to form an expansion cavity, and the opening of the expansion cavity faces the first opening; and / or,

[0012] There are a plurality of the fans, and there are a plurality of the resonance cavities. The ventilation holes of the plurality of resonance cavities are provided in one-to-one correspondence with the plurality of fans.

[0013] According to an embodiment of the present application, the noise reduction structure includes a partition plate. The partition plate divides the air duct housing into a first chamber and a second chamber. The first opening and the second opening are disposed in the first chamber, and the partition plate is provided with at least one through hole communicating the first chamber and the second chamber.

[0014] According to an embodiment of the present application, the partition plate has multiple sections connected in a bent manner, and the through hole is disposed on the sections of the multiple-section partition plate except for the two end sections; and / or,

[0015] The second chamber is filled with a sound absorption material; and / or,

[0016] The wall surface of the partition plate is provided with a sound absorption layer.

[0017] According to an embodiment of the present application, the noise reduction device includes a baffle plate. The baffle plate is connected to the air duct housing, and at least a part of the baffle plate is spaced apart from the second opening to form a ventilation opening;

[0018] Along the normal direction of the wall surface where the second opening is located, at least a part of the projection of the second opening falls within the projection of the baffle plate.

[0019] According to an embodiment of the present application, there are a plurality of the second openings, and the plurality of second openings are spaced apart and disposed on the same wall surface of the air duct housing. There are a plurality of the baffle plates, and the plurality of baffle plates are provided in one-to-one correspondence with the plurality of second openings. A spacing is formed between adjacent baffle plates to form the ventilation opening.

[0020] Second aspect, the present application provides a noise reduction device, which is applied to the power conversion device described in any of the above embodiments. The noise reduction device includes:

[0021] An air duct housing, which has a first opening communicating with the heat dissipation housing and at least two second openings communicating with the outside. The first opening and the second openings are located on different walls;

[0022] A noise reduction structure, which is arranged inside the air duct housing.

[0023] According to the noise reduction device of the present application, by arranging the noise reduction device outside the heat dissipation housing, the air duct of the noise reduction device has a first opening communicating with the heat dissipation housing and at least two second openings communicating with the outside. The first opening and the second openings are located on different walls. On the one hand, by providing multiple second openings communicating with the outside, multiple air channels can be formed, so as to change the outward propagation path of the fan noise, thereby achieving a certain noise reduction effect; on the other hand, by arranging the noise reduction structure inside the air duct housing, the sound wave energy can be absorbed, further reducing the sound energy propagating outward. Description of the Drawings

[0024] The above and / or additional aspects and advantages of the present application will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 is one of the structural schematic diagrams of the power conversion device provided by the embodiment of the present application;

[0026] Figure 2 is one of the structural schematic diagrams of the noise reduction device provided by the embodiment of the present application;

[0027] Figure 3 is Figure 1 the structural schematic diagram of;

[0028] Figure 4 is the second structural schematic diagram of the power conversion device provided by the embodiment of the present application;

[0029] Figure 5 is the third structural schematic diagram of the power conversion device provided by the embodiment of the present application;

[0030] Figure 6 is the second structural schematic diagram of the noise reduction device provided by the embodiment of the present application;

[0031] Figure 7 is Figure 6 the structural schematic diagram of;

[0032] Figure 8 is the structural schematic diagram of the resonant cavity provided by the embodiment of the present application;

[0033] Figure 9 It is the third structural schematic diagram of the noise reduction device provided by the embodiment of the present application;

[0034] Figure 10 is Figure 9 the structural schematic diagram;

[0035] Figure 11 It is the fourth structural schematic diagram of the noise reduction device provided by the embodiment of the present application;

[0036] Figure 12 is Figure 11 one of the structural schematic diagrams;

[0037] Figure 13 It is the fourth structural schematic diagram of the power conversion device provided by the embodiment of the present application;

[0038] Figure 14 is Figure 11 two of the structural schematic diagrams;

[0039] Figure 15 It is the fifth structural schematic diagram of the power conversion device provided by the embodiment of the present application.

[0040] Reference numerals:

[0041] Noise reduction device 1, air duct housing 11, first opening 111, second opening 112, first chamber 113, second chamber 114, sound absorption layer 121, resonance chamber 122, ventilation hole 1221, expansion chamber 123, partition 124, through hole 1241, baffle 125;

[0042] Cabinet 2, air inlet 21, air outlet 22, heat dissipation housing 23, equipment housing 24, fan 3. Detailed implementation manners

[0043] The embodiments of the present application will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present application and should not be construed as a limitation to the present application.

[0044] Reference will be made below to Figures 1 - 15 describe the power conversion device and the noise reduction device 1 according to the embodiments of the present application.

[0045] The power conversion device provided by the embodiments of the present application includes: a cabinet 2, electronic devices, a fan 3, and a noise reduction device 1; as Figure 1 shown, the cabinet 2 forms an equipment housing 24 and a heat dissipation housing 23; the electronic devices are arranged in the equipment housing 24; as Figure 2As shown, the noise reduction device 1 includes a duct housing 11 and a noise reduction structure. The duct housing 11 has a first opening 111 communicating with the heat dissipation housing 23 and at least two second openings 112 communicating with the outside. The first opening 111 and the second openings 112 are located on different walls. The noise reduction structure is arranged inside the duct housing 11; as Figure 4 and Figure 11 shown, the fan 3 is installed in the heat dissipation channel formed by the heat dissipation housing 23 and the duct housing 11.

[0046] Among them, the device housing 24 is used to accommodate and protect the internal electronic devices. The heat dissipation housing 23 communicates with the device housing 24 to dissipate heat from the electronic devices inside the device housing 24.

[0047] The fan 3 can be arranged inside the heat dissipation housing 23, or the fan 3 can be arranged inside the device housing 24, or the fan 3 can be arranged between the device housing 24 and the heat dissipation housing 23. The heat dissipation housing 23 is used to provide space to promote air flow and help dissipate heat from the electronic devices. The fan 3 is used to force the air flow inside the device housing 24 and the heat dissipation housing 23 to improve the heat dissipation efficiency of the electronic devices.

[0048] As Figure 2 and Figure 11 shown, the noise reduction device 1 includes a duct housing 11 and a noise reduction structure. The first opening 111 of the duct housing 11 can communicate with the air inlet 21 and the air outlet 22 of the heat dissipation housing 23. At least two second openings 112 all communicate with the outside, that is, the duct housing 11 is provided with at least three ventilation openings, at least one of which communicates with the heat dissipation housing 23 and at least two communicate with the outside.

[0049] The second opening 112 can include two or more. By providing a plurality of second openings 112 communicating with the outside, a plurality of air channels can be formed, thereby reducing the speed of the air flow entering or discharging from the duct housing 11, achieving a certain effect of dispersing sound waves, and thus improving the noise reduction effect of the duct housing 11.

[0050] Among them, the first opening 111 and the second openings 112 are located on different walls. In other words, the first opening 111 and the second openings 112 can be located on adjacent walls or on opposite walls.

[0051] In the case where the first opening 111 and the second openings 112 are located on adjacent walls, the propagation path of the sound waves discharged from the duct housing 11 needs to change the flow direction at least once, and the flow speed of the sound waves is reduced, further achieving the noise reduction effect.

[0052] In the case where the first opening 111 and the second openings 112 are located on opposite walls, the sound waves discharged from the duct housing 11 need to be shunted at least once, and the flow speed of the sound waves is reduced, achieving the noise reduction effect.

[0053] Among them, the noise reduction structure can be selected to use noise reduction adsorption materials or noise reduction physical baffle structures according to different requirements and design requirements, or both can be used in combination to achieve the best noise reduction effect. For example, porous materials, foam materials or other types of sound-absorbing materials can be covered on the inner surface of the air duct shell 11 to absorb sound waves; at the same time, partitions 124, baffle plates 125 or other shaped baffle plates are arranged in the air duct to change the propagation path of the sound waves, block or disperse the sound waves, and further reduce the sound energy.

[0054] According to the power conversion device provided by the embodiment of the present application, by arranging the noise reduction device 1 outside the heat dissipation shell 23, the air duct of the noise reduction device 1 has a first opening 111 communicating with the heat dissipation shell 23 and at least two second openings 112 communicating with the outside. The first opening 111 and the second opening 112 are located on different walls. On the one hand, by arranging a plurality of second openings 112 communicating with the outside, a plurality of air channels can be formed, so as to change the outward propagation path of the noise of the fan 3, thereby achieving a certain noise reduction effect; on the other hand, by arranging a noise reduction structure in the air duct shell 11, the sound wave energy can be absorbed, and the sound energy propagating outward can be further reduced.

[0055] In some embodiments, such as Figure 2 , Figure 6 and 8 shown, the second opening 112 includes two, and the two second openings 112 are arranged oppositely and are arranged on the adjacent walls of the first opening 111.

[0056] In this embodiment, the two second openings 112 are arranged oppositely and are arranged on the adjacent walls of the first opening 111. The propagation path of the sound wave needs to change direction at least once, so as to optimize the air flow path, which helps to improve the heat dissipation efficiency and reduce the sound energy.

[0057] In some embodiments, such as Figure 1 shown, the heat dissipation shell 23 includes an air inlet 21 and an air outlet 22. The fan 3 sucks the cold air flow from the outside into the heat dissipation shell 23 through the air inlet 21 and drives the hot air flow in the heat dissipation shell 23 to be discharged from the air outlet 22, so as to realize the heat dissipation of the heat dissipation shell 23.

[0058] Among them, the first opening 111 and the heat dissipation shell 23 have at least the following two setting positions:

[0059] First, as Figure 5 and Figure 15 shown, the first opening 111 communicates with the air outlet 22 of the heat dissipation shell 23.

[0060] In this embodiment, the first opening 111 is the inlet of the air duct housing 11. The sound waves in the heat dissipation housing 23 are introduced into the first opening 111 of the air duct housing 11 from the air outlet 22 of the heat dissipation housing 23. After the sound waves are absorbed, blocked or dispersed in the air duct housing 11, they are then discharged into the outside through the second opening 112 of the air duct housing 11, achieving noise reduction of the sound waves.

[0061] Second, as Figure 4 and Figure 13 shown, the first opening 111 is communicated with the air inlet 21 of the heat dissipation housing 23.

[0062] In this embodiment, the first opening 111 is the outlet of the air duct housing 11. The external sound waves enter the air duct housing 11 through the second opening 112 of the air duct housing 11. After the sound waves are absorbed, blocked or dispersed in the air duct housing 11, they are then discharged into the air inlet 21 of the heat dissipation housing 23 through the first opening 111 of the air duct housing 11, and then discharged into the outside through the air outlet 22 of the heat dissipation housing 23. Since the flow velocity of the incoming air is small and the sound waves are small, the sound energy generated when the fan 3 operates is small, achieving noise reduction of the sound waves.

[0063] In some embodiments, the noise reduction structure includes a sound absorption layer 121, and the sound absorption layer 121 is laid on the inner wall of the air duct housing 11. The sound absorption layer 121 on the wall surface can absorb and attenuate the sound energy to improve the noise reduction effect.

[0064] Among them, the sound absorption layer 121 can be a porous material, a foam material or other types of sound absorption materials.

[0065] In some embodiments, as Figure 2 shown, the noise reduction structure includes a sound absorption layer 121, and the sound absorption layer 121 is disposed opposite to the first opening 111.

[0066] The wall surface of the air duct housing 11 opposite to the first opening 111 is provided with a sound absorption layer 121. The other wall surfaces of the air duct housing 11 can also be provided with a sound absorption layer 121, or can not be provided with a sound absorption layer 121, and the noise reduction effect can be achieved.

[0067] In this embodiment, as Figure 3 shown, due to the directivity of the sound waves of the fan 3, during the process of the sound waves propagating to the outside, they will first propagate to the wall surface directly in front of the fan 3, and the sound absorption layer 121 is pasted on this wall surface. A part of the sound energy is absorbed and attenuated by the sound absorption layer 121 on the wall surface, a part of the sound energy is reflected into the cavity of the air duct housing 11, and there is still a small part of the sound energy that changes direction and propagates to the outside. In this way, compared with the original way of directly releasing the sound energy of the fan 3 to the outside in the back-inlet air mode, this noise reduction device 1 significantly reduces the sound energy propagated by the fan 3 to the outside and achieves the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0068] In some embodiments, asFigure 6 As shown, the noise reduction structure includes at least one resonance cavity 122. The resonance cavity 122 is disposed on the opposite wall of the wall where the first opening 111 is located, and the ventilation hole 1221 of the resonance cavity 122 faces the first opening 111.

[0069] Wherein, sound absorption layers 121 are pasted on the inner walls of the air duct shell 11.

[0070] The resonance cavity 122 is a chamber with an opening. The ventilation hole 1221 of the resonance cavity 122 is arranged opposite to the first opening 111. The resonance cavity 122 can include one or more. Multiple resonance cavities 122 can be arranged at intervals or closely arranged.

[0071] In this embodiment, as Figure 7 shown, during the process of the sound energy sound wave of the fan 3 propagating outward through the air duct shell 11, a part of the sound energy is absorbed and attenuated by the resonance cavity 122 in front of the fan 3. The narrowband frequency that the resonator can eliminate coincides with the first-order passing noise frequency of the fan 3, achieving a certain noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0072] In some embodiments, as Figure 6 shown, the resonance cavity 122 includes multiple ones. The multiple resonance cavities 122 are arranged along the extension direction of the air duct shell 11. An expansion cavity 123 is formed by arranging adjacent two resonance cavities 122 at intervals. The opening of the expansion cavity 123 faces the first opening 111; and the fan 3 includes multiple ones, the resonance cavity 122 includes multiple ones, and the ventilation holes 1221 of the multiple resonance cavities 122 are arranged in one-to-one correspondence with the multiple fans 3.

[0073] Wherein, as Figure 6 shown, the ventilation hole 1221 of the resonance cavity 122 communicates the resonance cavity 122 with the inner cavity of the air duct shell 11. The multiple resonance cavities 122 are arranged at intervals, and an expansion cavity 123 is formed between adjacent two resonance cavities 122. The resonance cavities 122 are arranged at intervals to form the shell structure of the air duct shell 11 with expansion and contraction. The resonance cavity 122 is arranged opposite to the fan 3, which can achieve a better noise reduction effect on the directional sound wave generated by the fan 3.

[0074] In this embodiment, as Figure 7As shown, during the process of the sound energy of the fan 3 propagating outward through the air duct housing 11, a part of the sound energy is absorbed and attenuated by the resonance cavity 122 in front of the fan 3. The narrowband frequency that the resonator can eliminate coincides with the first-order passing noise frequency of the fan 3, achieving a certain noise reduction effect. During the process of a part of the sound energy propagating outward through the air duct housing 11, the sound energy needs to pass through the housing structure of the air duct housing 11 formed by the resonance cavity 122 and the expansion cavity 123. The acoustic impedance changes at the interface of expansion and contraction, and part of the sound energy will be reflected back into the cavity of the air duct housing 11, thereby attenuating the sound energy propagating outward and achieving the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0075] In some embodiments, as Figure 7 shown, there are multiple resonance cavities 122. The multiple resonance cavities 122 are arranged along the extending direction of the air duct housing 11. An expansion cavity 123 is formed by spacing between adjacent two resonance cavities 122. The opening of the expansion cavity 123 faces the first opening 111.

[0076] Among them, the multiple resonance cavities 122 are spaced apart. An expansion cavity 123 is formed between adjacent two resonance cavities 122. The resonance cavities 122 are spaced to form the housing structure of the air duct housing 11 with expansion and contraction. The acoustic impedance changes at the interface of expansion and contraction, and part of the sound energy will be reflected back into the cavity of the air duct housing 11, thereby attenuating the sound energy propagating outward and achieving the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0077] In some embodiments, there are multiple fans 3 and multiple resonance cavities 122. The ventilation holes 1221 of the multiple resonance cavities 122 are arranged in one-to-one correspondence with the multiple fans 3. The resonance cavity 122 and the fan 3 are arranged in alignment, which can achieve a better noise reduction effect on the directional sound waves generated by the fan 3.

[0078] Among them, as Figure 8 shown, the noise elimination principle of the resonance cavity 122 is briefly described as follows:

[0079] The resonance cavity 122 can be used to eliminate the following narrowband frequencies in the sound wave:

[0080]

[0081] In the formula: c is the wave speed; A is the cross-sectional area of the ventilation hole 1221 of the resonance cavity 122, r is the radius of the ventilation hole 1221; V is the cavity volume of the resonance cavity 122; L is the thickness of the ventilation hole 1221, which is the thickness of the plate where the ventilation hole 1221 is located here.

[0082] In this embodiment, by designing the radius r of the ventilation hole 1221 and the cavity volume V of the resonance cavity 122, the absorption effect of the narrowband noise with a relatively high energy proportion in the fan 3 can be improved, such as the first-order and second-order noises of the fan 3, etc.

[0083] Among them, as Figure 7 shown, the noise reduction principle of the expansion cavity 123 is briefly described as follows:

[0084] When plane sound waves propagate in a rigid-wall pipe, at the place where the cross-sectional area suddenly expands (or contracts), part of the sound waves are reflected on the interface of the expansion (or contraction) part, and the other part of the sound waves continue to propagate forward through the interface of the expansion (or contraction) part. Since the sound waves are reflected back, the sound propagating outward is reduced, achieving a certain noise reduction effect.

[0085] In some embodiments, as Figure 9 and Figure 10 shown, the noise reduction structure includes a partition 124. The partition 124 divides the air duct housing 11 into a first chamber 113 and a second chamber 114. The first opening 111 and the second opening 112 are arranged in the first chamber 113, and the partition 124 is provided with at least one through hole 1241 connecting the first chamber 113 and the second chamber 114.

[0086] Among them, the first opening 111 and the second opening 112 are arranged in the first chamber 113, which can not only achieve the heat dissipation effect but also achieve the noise reduction effect.

[0087] In this embodiment, as Figure 10 shown, the through hole 1241 on the partition 124 connects the first chamber 113 and the second chamber 114. During the process of the sound waves propagating to the outside through the air duct housing 11, part of the sound energy can enter the second chamber 114 through the ventilation hole 1221. Since part of the sound energy will be reflected into the second chamber 114, part of the sound energy propagating outward is attenuated, improving the noise reduction effect.

[0088] In some embodiments, as Figure 9 and Figure 10 shown, the partition 124 has multiple sections connected by bending, and the through hole 1241 is arranged on the sections of the multiple-section partition 124 except the two ends; and the second chamber 114 is filled with sound-absorbing material; and the wall surface of the partition 124 is provided with a sound-absorbing layer 121.

[0089] Among them, the partition 124 has multiple sections connected by bending. The folded-plate design of the partition 124 increases the length and curvature of the air flow channel, increases the contact area between the sound energy and the sound-absorbing material, and can achieve a greater noise reduction effect.

[0090] As Figure 9As shown, the segments at both ends of the multi-segment partition 124 are not provided with through holes 1241, and the through holes 1241 are provided on the partition 124 in the middle of the multi-segment partition 124, which can increase the sound absorption effect of the second chamber 114 and reduce the sound energy escaping from the second chamber 114. When the sound energy propagates to the second opening 112 communicating with the outside, the through holes 1241 are not provided at both ends of the multi-segment partition 124, and reflection plates are formed at both ends. A part of the sound energy is reflected back into the first chamber 113 by the reflection plates, reducing the outward propagation of the sound energy. A part of the sound energy passes through the through holes 1241 and is absorbed and attenuated by the sound-absorbing material filled in the second chamber 114. During the process of the sound energy of the fan 3 propagating outward, the sound energy reaches the partition 124 in front of the fan 3, and a part of the energy is absorbed, reduced in noise, and attenuated by the sound-absorbing layer 121 on the partition 124.

[0091] Among them, the sound-absorbing material can be a porous material, a foam material or other types of materials.

[0092] In this embodiment, as Figure 10 shown, by setting the partition 124 as multi-segment with bent connections, the reflection effect of sound waves in the air duct shell 11 can be increased, the number of sound waves reflected out of the second chamber 114 can be reduced, the sound absorption effect of the second chamber 114 can be improved, and the noise reduction effect can be improved; by filling the second chamber 114 with a sound-absorbing material, the sound energy reflected into the second chamber 114 is absorbed by the sound-absorbing material, improving the noise reduction effect; by providing a sound-absorbing layer 121 on the wall surface of the partition 124 opposite to the first opening 111, a part of the sound energy that does not enter the second chamber 114 is reflected in the second chamber 114, and a part of the sound energy that does not enter the second chamber 114 is absorbed by the sound-absorbing layer 121, so that a part of the outward-propagating sound energy can be further attenuated, improving the noise reduction effect.

[0093] In some embodiments, the partition 124 has multi-segment with bent connections, and the through holes 1241 are provided on the segments of the multi-segment partition 124 except at both ends.

[0094] Among them, the segments at both ends of the multi-segment partition 124 are not provided with through holes, and the through holes 1241 are provided on the partition 124 in the middle of the multi-segment partition 124, which can increase the sound absorption effect of the second chamber 114 and reduce the sound energy escaping from the second chamber 114. When the sound energy propagates to the second opening 112 communicating with the outside, the through holes 1241 are not provided at both ends of the multi-segment partition 124, and reflection plates are formed at both ends. A part of the sound energy is reflected back into the first chamber 113 by the reflection plates, reducing the outward propagation of the sound energy.

[0095] In this embodiment, the partition 124 has multiple segments connected by bends, which can increase the reflection effect of sound waves in the air duct housing 11, reduce the number of sound waves reflected out of the second chamber 114, improve the sound absorption effect of the second chamber 114, and improve the noise reduction effect.

[0096] In some embodiments, the second chamber 114 is filled with sound-absorbing material, and the sound energy reflected into the second chamber 114 is absorbed by the sound-absorbing material, improving the noise reduction effect.

[0097] Among them, a part of the sound energy passes through the through hole 1241 and is absorbed and attenuated by the sound-absorbing material filled in the second chamber 114.

[0098] In some embodiments, the wall surface of the partition 124 is provided with a sound-absorbing layer 121.

[0099] Among them, sound-absorbing layers 121 can be provided on both sides of the partition 124, or a sound-absorbing layer 121 can be provided on the wall surface of the partition 124 facing away from the first opening 111, or a sound-absorbing layer 121 can be provided on the wall surface of the partition 124 opposite to the first opening 111.

[0100] In this embodiment, a part of the sound energy that does not enter the second chamber 114 is reflected in the second chamber 114, and a part of the sound energy that does not enter the second chamber 114 is absorbed by the sound-absorbing layer 121, so that a part of the sound energy propagating outward can be further attenuated, improving the noise reduction effect.

[0101] Among them, during the process of the sound energy of the fan 3 propagating outward, the sound energy is transmitted to the partition 124 in front of the fan 3, and a part of the energy is absorbed and attenuated by the sound-absorbing layer 121 on the partition 124.

[0102] In some embodiments, the partition 124 has multiple segments connected by bends, and the through hole 1241 is provided on the segments of the multiple segments of the partition 124 except the two ends; and the second chamber 114 is filled with sound-absorbing material.

[0103] In this embodiment, by setting the partition 124 to have multiple segments connected by bends, the reflection effect of sound waves in the air duct housing 11 can be increased, the number of sound waves reflected out of the second chamber 114 can be reduced, the sound absorption effect of the second chamber 114 can be improved, and the noise reduction effect can be improved; by filling the second chamber 114 with sound-absorbing material, the sound energy reflected into the second chamber 114 is absorbed by the sound-absorbing material, improving the noise reduction effect.

[0104] In some embodiments, the partition 124 has multiple segments connected by bends, the through hole 1241 is provided on the segments of the multiple segments of the partition 124 except the two ends; and the wall surface of the partition 124 is provided with a sound-absorbing layer 121.

[0105] Wherein, sound absorption layers 121 may be provided on both sides of the partition plate 124, or a sound absorption layer 121 may be provided on the wall surface of the partition plate 124 facing away from the first opening 111, or a sound absorption layer 121 may be provided on the wall surface of the partition plate 124 opposite to the first opening 111.

[0106] In this embodiment, by setting the partition plate 124 to be multi-segmented with bent connections, the reflection effect of sound waves in the air duct housing 11 can be increased, the number of sound waves reflected out of the second chamber 114 can be reduced, the sound insulation effect of the second chamber 114 can be improved, and the noise reduction effect can be improved; by providing a sound absorption layer 121 on the wall surface of the partition plate 124, a part of the sound energy that does not enter the second chamber 114 is reflected in the second chamber 114, and a part of the sound energy that does not enter the second chamber 114 is absorbed by the sound absorption layer 121, so that a part of the outward-propagating sound energy can be further attenuated, and the noise reduction effect can be improved.

[0107] In some embodiments, as Figure 10 shown, the second chamber 114 is filled with sound absorption material; and a sound absorption layer 121 is provided on the wall surface of the partition plate 124.

[0108] Wherein, sound absorption layers 121 may be provided on both sides of the partition plate 124, or a sound absorption layer 121 may be provided on the wall surface of the partition plate 124 facing away from the first opening 111, or a sound absorption layer 121 may be provided on the wall surface of the partition plate 124 opposite to the first opening 111.

[0109] In this embodiment, by filling the second chamber 114 with sound absorption material, the sound energy reflected into the second chamber 114 is absorbed by the sound absorption material, and the noise reduction effect is improved; by providing a sound absorption layer 121 on the partition plate 124, a part of the sound energy that does not enter the second chamber 114 is reflected in the second chamber 114, and a part of the sound energy that does not enter the second chamber 114 is absorbed by the sound absorption layer 121, so that a part of the outward-propagating sound energy can be further attenuated, and the noise reduction effect is improved.

[0110] In some embodiments, as Figure 11 shown, the noise reduction device 1 includes a baffle 125. The baffle 125 is connected to the air duct housing 11 and at least partially spaced apart from the second opening 112 to form a ventilation opening; along the normal direction of the wall surface where the second opening 112 is located, at least a part of the projection of the second opening 112 falls within the projection of the baffle 125.

[0111] Wherein, as Figure 12 and Figure 14As shown, the sound waves propagate in the channel formed by the first opening 111, the vent and the second opening 112. The baffle 125 is arranged on the propagation path of the sound waves. The projection of the second opening 112 coincides with at least part of the projection of the baffle 125, which has a certain blocking and diversion effect on the sound waves, thereby achieving a certain noise reduction effect. The baffle 125 can be a folded plate structure, or a smoothly connected arc plate structure or a bellows structure.

[0112] Among them, Figure 11 and Figure 14 As shown, a sound-absorbing layer 121 is laid around the inner wall of the air duct shell 11. During the process of the sound energy of the fan 3 propagating outward, a part of the sound energy is absorbed by the sound-absorbing layer 121 on the inner wall of the air duct shell 11, and the sound energy is greatly attenuated; a part of the sound energy is blocked by the baffle 125 on the side of the second air outlet, and the sound energy of the fan 3 is reflected into the cavity of the air duct shell 11, reducing the outward propagation of the sound energy; the main medium and high frequency components in the sound energy of the fan 3 have a short wavelength and weak diffraction ability, and part of the energy is difficult to diffract through the baffle 125 to the first opening 111, thereby reducing the sound energy propagating to the outside.

[0113] In this embodiment, during the propagation of acoustic energy, the acoustic energy is absorbed by the sound absorbing layer 121 , diffracted by the internal baffle 125 , and reflected by the internal baffle 125 , thereby greatly attenuating the outward propagation of the acoustic energy.

[0114] In some embodiments, the second openings 112 include multiple, multiple second openings 112 are spaced apart and arranged on the same wall of the air duct shell 11, the baffles 125 include multiple, multiple baffles 125 are arranged one-to-one corresponding to the multiple second openings 112, and adjacent baffles 125 are spaced apart to form vents.

[0115] The plurality of baffles 125 are spaced apart to allow airflow to pass through while also helping to reduce acoustic energy. Each second opening 112 is provided with a baffle 125 on one side, further attenuating the outward propagation of acoustic energy through diffraction and reflection within the baffles 125 .

[0116] In this embodiment, if Figure 13 As shown, the first opening 111 can be connected to the air inlet 21 of the heat dissipation shell 23. In this assembly method, the sound wave propagation path in the noise reduction device 1 is as follows: Figure 12 As shown by the arrow in the middle; Figure 15 As shown, the first opening 111 can be connected to the air outlet 22 of the heat dissipation shell 23. In this assembly method, the sound wave propagation path in the noise reduction device 1 is as follows: Figure 14 As shown by the arrow in the middle,

[0117] The embodiment of the present application further provides a noise reduction device 1, which is applied to the power conversion device in any of the above embodiments. The noise reduction device 1 includes: an air duct housing 11 and a noise reduction structure. The air duct housing 11 has a first opening 111 communicating with the heat dissipation housing 23 and at least two second openings 112 communicating with the outside. The first opening 111 and the second openings 112 are located on different walls; the noise reduction structure is arranged inside the air duct housing 11.

[0118] According to the noise reduction device 1 provided by the embodiment of the present application, by arranging the noise reduction device 1 outside the heat dissipation housing 23, the air duct of the noise reduction device 1 has a first opening 111 communicating with the heat dissipation housing 23 and at least two second openings 112 communicating with the outside. The first opening 111 and the second openings 112 are located on different walls. On the one hand, by providing a plurality of second openings 112 communicating with the outside, a plurality of air passages can be formed, so as to change the outward propagation path of the noise of the fan 3, thereby achieving a certain noise reduction effect; on the other hand, by arranging a noise reduction structure inside the air duct housing 11, the sound wave energy can be absorbed, further reducing the sound energy propagating outward.

[0119] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects. The character " / " generally means that the related objects before and after are in an "or" relationship.

[0120] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0121] In the description of the present application, the "first feature", "second feature" may include one or more of such features.

[0122] In the description of the present application, the meaning of "a plurality" is two or more.

[0123] In the description of the present application, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but being in contact through additional features therebetween.

[0124] In the description of the present application, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0125] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "schematic embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. 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.

[0126] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A power conversion device, characterized in that, Comprising: A box body, which forms an equipment housing and a heat dissipation housing; Electronic devices, which are arranged inside the equipment housing; A noise reduction device, which includes an air duct housing and a noise reduction structure. The air duct housing has a first opening communicating with the heat dissipation housing and at least two second openings communicating with the outside. The first opening and the second openings are located on different walls, and the noise reduction structure is arranged inside the air duct housing; A fan, which is installed inside a heat dissipation channel formed by the heat dissipation housing and the air duct housing.

2. The power conversion device according to claim 1, characterized in that, There are two of the second openings, and the two second openings are arranged oppositely and are arranged on adjacent walls of the first opening.

3. The power conversion device according to claim 1, characterized in that The heat dissipation housing includes an air inlet and an air outlet; The first opening communicates with the air outlet of the heat dissipation housing, or the first opening communicates with the air inlet of the heat dissipation housing.

4. The power conversion device according to claim 1, wherein The noise reduction structure includes a sound absorption layer, and the sound absorption layer is laid on the inner wall of the air duct housing.

5. The power conversion device according to any one of claims 1-4, characterized in that, The noise reduction structure includes at least one resonance cavity, and the resonance cavity is arranged on the opposite wall of the wall where the first opening is located, and the ventilation holes of the resonance cavity face the first opening.

6. The power conversion device according to claim 5, wherein There are multiple resonance cavities, and the multiple resonance cavities are arranged along the extending direction of the air duct housing. An expansion cavity is formed by spacing between adjacent two resonance cavities, and the opening of the expansion cavity faces the first opening; And / or There are multiple fans, and there are multiple resonance cavities. The ventilation holes of the multiple resonance cavities are arranged in one-to-one correspondence with the multiple fans.

7. The power conversion device according to any one of claims 1-4, wherein The noise reduction structure includes a partition plate, and the partition plate divides the air duct housing into a first chamber and a second chamber. The first opening and the second openings are arranged in the first chamber, and the partition plate is provided with at least one through hole communicating the first chamber and the second chamber.

8. The power conversion device according to claim 7, wherein The partition plate has multiple sections connected by bending, and the through hole is arranged on the sections of the multiple partition plates except the two end sections; and / or The second chamber is filled with sound absorption material; and / or The wall surface of the partition plate is provided with a sound absorption layer.

9. The power conversion device according to claim 1, wherein The noise reduction device includes a baffle plate, and the baffle plate is connected to the air duct housing and at least partially forms a ventilation opening by being spaced apart from the second opening; Along the normal direction of the wall where the second opening is located, at least part of the projection of the second opening falls within the projection of the baffle plate.

10. The power conversion device according to claim 9, wherein, There are multiple second openings, and the multiple second openings are arranged at intervals on the same wall of the air duct housing. There are multiple baffle plates, and the multiple baffle plates are arranged in one-to-one correspondence with the multiple second openings. A ventilation opening is formed by spacing between adjacent baffle plates.

11. A noise reduction device, characterized in that, Applied to the power conversion device according to any one of claims 1-10 above, the noise reduction device includes: Air duct housing, the air duct housing having a first opening communicating with the heat dissipation housing and at least two second openings communicating with the outside, the first opening and the second openings being located on different walls; Noise reduction structure, the noise reduction structure being disposed within the air duct housing.

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