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 and a noise reduction device, the box body forms a heat dissipation shell; the electronic device is arranged in the equipment shell; the noise reduction device comprises an air duct shell and a draught fan, the air duct shell comprises a first opening and a second opening, the first opening and the second opening are communicated to form an air duct, the air duct comprises multiple sections arranged in a bent mode, the first opening is communicated with the heat dissipation shell, the second opening is used for being communicated with the outside, and the draught fan is arranged in the air duct shell. And the fan is arranged in the air duct, so that the sound energy pollution 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 indicator that people are very concerned about. At present, in order to better dissipate heat from the electronic devices in the power conversion device, a heat dissipation device such as a fan is usually provided inside the power conversion device to dissipate heat from the electronic devices in the power conversion device through the heat dissipation device such as a fan. However, heat dissipation devices such as fans are prone to generate sound energy during operation, which has an adverse impact on the surrounding environment. Utility Model Content

[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 the power conversion device.

[0004] In a first aspect, this application provides a power conversion device, including: a box body, electronic devices, and a noise reduction device; the box body forms an equipment shell and a heat dissipation shell; the electronic devices are arranged inside the equipment shell; the noise reduction device includes a duct shell and a fan, the duct shell includes a first opening and a second opening, the first opening and the second opening are communicated to form a duct, the duct includes multiple sections arranged in a bent manner, the first opening is communicated with the heat dissipation shell, the second opening is used for communicating with the outside, and the fan is arranged inside the duct.

[0005] According to the power conversion device provided by the embodiments of this application, by installing the noise reduction device on the power conversion device, a fan is arranged inside the noise reduction device, and the fan is installed inside the noise reduction device outside the box body. On the one hand, the specification selection of the duct shell and the fan can be increased, the installation space of the fan can be increased by expanding the size of the duct, so that a large-size, low-speed, and low-noise fan can be selected to reduce the noise generated by the fan and improve the noise reduction effect on the power conversion device. At the same time, since the noise reduction device is arranged outside the box body, it is also convenient for disassembling and assembling the noise reduction device and for maintenance; on the other hand, in terms of structural space, adjusting the fan from being installed inside the box body to being installed outside the box body can increase the space for stacking the fans front and back. By increasing the distance between the obstacles in front and behind the fan and the air inlets and outlets of the fan, the eddy current noise generated when the air flow passes through the obstacles can be effectively reduced, thereby improving the noise reduction effect on the power conversion device.

[0006] According to an embodiment of this application, the axis of the fan intersects the normal of the plane where the first opening is located and the normal of the plane where the second opening is located respectively.

[0007] According to an embodiment of the present application, the axis of the fan is perpendicular to the normal of the plane where the first opening is located and the normal of the plane where the second opening is located, respectively.

[0008] According to an embodiment of the present application, the cross-sectional area of the first opening is larger than that of the second opening; and / or, the first opening is rectangular.

[0009] According to an embodiment of the present application, the noise reduction device includes a sound absorption layer, and the sound absorption layer is disposed opposite to the air outlet side of the fan.

[0010] According to an embodiment of the present application, the air duct housing further includes a cover body, the cover body includes a first port and a second port that are communicated with each other, the cover body includes multiple sections that are bent, the first port is communicated with the second opening, and the second port is used for communicating with the outside.

[0011] According to an embodiment of the present application, the air duct housing further includes a baffle, the baffle is located in the air duct and is disposed between the fan and the second opening, one end of the baffle is spaced apart from the air duct housing to form a ventilation opening, and the other end is connected to the air duct housing, and the ventilation opening is located at the end of the baffle away from the second opening;

[0012] The first opening, the ventilation opening and the second opening are sequentially communicated to form the air duct.

[0013] According to an embodiment of the present application, the normal of the baffle is perpendicular to the normal of the plane where the second opening is located.

[0014] According to an embodiment of the present application, the cabinet includes a plurality of them, and the plurality of heat dissipation shells of the plurality of cabinets are all communicated with the first opening.

[0015] According to an embodiment of the present application, the power conversion device further includes a sound barrier, and at least a part of the sound barrier is disposed opposite to the second opening of the air duct.

[0016] In a second aspect, the present application provides a noise reduction device applied to the power conversion device according to any one of the above embodiments, and the noise reduction device includes:

[0017] An air duct housing, the air duct housing includes a first opening and a second opening, the first opening and the second opening are communicated to form an air duct, and the air duct includes multiple sections that are bent;

[0018] A fan, and the fan is disposed in the air duct.

[0019] According to the noise reduction device provided by the embodiments of the present application, it can be installed on a power conversion device. On the one hand, by installing the fan in the noise reduction device outside the box, the specification selection of the air duct housing and the fan is relatively flexible. The size of the air duct can be enlarged, and the selection of the fan structure size can be increased. For example, a large-size, low-speed, and low-noise fan can be selected, thereby reducing the noise generated by the fan, improving the noise reduction effect on the power conversion device, and also facilitating the disassembly and assembly of the noise reduction device and maintenance. On the other hand, in terms of structural space, by adjusting the installation of the fan from inside the box to outside the box, the space for stacking the fans front and back is no longer crowded, and the obstacles in front and behind the fan can be kept away from the air inlet and outlet of the fan, thereby effectively reducing the eddy current noise generated when the air flow passes through the obstacles, and thus improving the noise reduction effect on the power conversion device.

[0020] Additional aspects and advantages of the present application will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 is a schematic structural diagram of a box in the related art;

[0023] Figure 2 is a schematic structural diagram of a box provided by an embodiment of the present application;

[0024] Figure 3 is one of the schematic structural diagrams of the noise reduction device provided by an embodiment of the present application;

[0025] Figure 4 is another schematic structural diagram of the noise reduction device provided by an embodiment of the present application;

[0026] Figure 5 is yet another schematic structural diagram of the noise reduction device provided by an embodiment of the present application;

[0027] Figure 6 is still another schematic structural diagram of the noise reduction device provided by an embodiment of the present application;

[0028] Figure 7 is Figure 6 the schematic structural diagram at A-A in

[0029] Figure 8 is one of the schematic structural diagrams of the noise reduction device provided by an embodiment of the present application;

[0030] Figure 9 is Figure 8 the schematic structural diagram at B-B in

[0031] Figure 10 It is the sixth structural schematic diagram of the noise reduction device provided by the embodiment of the present application;

[0032] Figure 11 It is the structural schematic diagram of the cover body provided by the embodiment of the present application;

[0033] Figure 12 It is Figure 10 the structural schematic diagram at C-C in

[0034] Figure 13 It is one of the structural schematic diagrams of the power conversion device provided by the embodiment of the present application;

[0035] Figure 14 It is the second structural schematic diagram of the power conversion device provided by the embodiment of the present application;

[0036] Figure 15 It is the third structural schematic diagram of the power conversion device provided by the embodiment of the present application.

[0037] Reference numerals:

[0038] Cabinet 1, electronic device 11, fan assembly 12, heat dissipation shell 13, equipment shell 14;

[0039] Noise reduction device 2, air duct shell 21, first opening 211, second opening 212, baffle 213, ventilation opening 214, mounting plate 215, avoidance opening 216, flanging 217, cover body 22, first port 221, second port 222, fan 23, mounting plate 24, connecting piece 25, sound barrier 26, fastener 27, cover plate 28. Detailed implementation manners

[0040] 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 denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference 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.

[0041] Next, reference is made to Figures 2 - 15 describe the power conversion device and the noise reduction device according to the embodiments of the present application.

[0042] As Figure 2 shown, for the sake of clear description, the whole machine back inlet air is taken as an example in this article for a detailed description of the design.

[0043] As Figure 2 , Figure 3 and Figure 4As shown in the figure, a power conversion device according to an embodiment of the present application includes: a box body 1, electronic devices 11, and a noise reduction device 2; the box body 1 forms a device shell and a heat dissipation shell 13; the electronic devices 11 are arranged in the device shell 1; the noise reduction device 2 includes a duct shell 21 and a fan 23, the duct shell 21 includes a first opening 211 and a second opening 212, the first opening 211 and the second opening 212 are connected to form a duct, the duct includes multiple sections arranged in a bent manner, the first opening 211 is connected to the heat dissipation shell 13, and the second opening 212 is used for connection to the outside, and the fan 23 is arranged in the duct.

[0044] Among them, the device shell is used to accommodate and protect the internal electronic devices 11. The heat dissipation shell 13 formed by the box body 1 is connected to the device shell, and the heat dissipation shell 13 is used to provide a space to promote air flow and help the electronic devices 11 in the device shell dissipate heat.

[0045] The duct shell 21 is arranged outside the box body 1 and is detachably connected to the box body 1. The duct shell 21 can be connected to the box body 1 by at least one of threaded connection, snap connection, and plug-in connection, so as to facilitate the installation and maintenance of the box body 1 and the noise reduction device 2.

[0046] In this embodiment, by installing the fan 23 in the duct shell 21 outside the box body 1, a large-size, low-speed, and low-noise fan 23 can be selected, thereby reducing the noise generated by the fan 23, and the obstacles in front of and behind the fan 23 can be kept away from the air inlets and outlets of the fan 23, which can reduce the eddy current noise of the air flow passing through the obstacles, thereby improving the noise reduction effect on the power conversion device.

[0047] As Figure 4 shown, the fan 23 is arranged in the duct. The fan 23 is used to force the air flow in the duct shell 21 and the heat dissipation shell 13, and improve the heat dissipation efficiency of the electronic devices 11; the electronic devices 11 can be located inside the heat dissipation shell 13 or outside the heat dissipation shell 13.

[0048] The noise reduction device 2 includes a duct shell 21 and a fan 23. The first opening 211 of the duct shell 21 can be connected to the air inlet or outlet of the heat dissipation shell 13, the second opening 212 is connected to the outside, and the fan 23 is located in the duct formed by the connection of the first opening 211 and the second opening 212 to force the air flow in the duct.

[0049] The duct is the channel formed by the duct shell 21. The duct includes multiple bent parts to guide the air to make at least one commutation during the flowing process. The first opening 211 of the duct is connected to the heat dissipation shell 13, and the second opening 212 of the duct is connected to the outside to realize the air inlet and outlet in the heat dissipation shell 13 and help the electronic devices 11 in the device shell dissipate heat.

[0050] In this embodiment, by installing the fan 23 in the air duct, the air duct has multiple sections with a bent setting. The airflow forcibly driven by the fan 23 undergoes at least one commutation in the bent air duct. The propagation path of the airflow sound wave needs to change its direction at least once, the flow velocity of the sound wave is reduced, the sound energy is reflected into the air duct, and the remaining part of the sound energy is refracted towards the outlet of the air duct, reducing the sound energy transmitted out of the air duct, and the noise reduction effect can be achieved;

[0051] In the related art, as Figure 1 shown, the power conversion device is mostly of an integrated structure. The fan assembly enters along the slideway from the fan assembly installation opening on the side of the box body. The fan assembly includes: a fan, a bracket, and a grille. There is insufficient operating space for the fan in the assembly method of the fan assembly and the box body. Only high-speed small fans can be placed in the box body, and high-speed small fans will cause relatively high fan noise; moreover, the fan is too close to the radiator and the grille holes. When the air flow enters and flows through the fan, air flow disorder is likely to occur, forming vortex noise. In addition, there is no noise reduction space at the air inlet of the fan, and no noise reduction accessories can be designed. Therefore, the low-noise requirements of some customers are often not met.

[0052] According to the power conversion device provided by the embodiment of the present application, by installing the fan 23 in the noise reduction device 2 outside the box body 1, on the one hand, the specification selection of the air duct shell 21 and the fan 23 can be increased. The installation space of the fan 23 can be increased by expanding the size of the air duct, so that a large-size, low-speed, and low-noise fan 23 can be selected, reducing the noise generated by the fan 23 and improving the noise reduction effect on the power conversion device. At the same time, since the noise reduction device 2 is arranged outside the box body, it is also convenient for disassembly and assembly of the noise reduction device 2 and for maintenance; on the other hand, in terms of structural space, by adjusting the installation of the fan 23 from inside the box body 1 to outside the box body 1, the space for stacking the fans 23 front and back can be increased. By increasing the distance between the obstacles in front and behind the fan 23 and the air inlet and outlet of the fan 23, the vortex noise generated when the air flow passes through the obstacles can be effectively reduced, thereby improving the noise reduction effect on the power conversion device.

[0053] In some embodiments, as Figure 7 、 Figure 9 and Figure 12 shown, the axis of the fan 23 intersects with the normal of the plane where the first opening 211 is located and the normal of the plane where the second opening 212 is located respectively. The arrow direction in the figure is the axis direction of the fan 23.

[0054] Among them, the fan 23 is located between the first opening 211 and the second opening 212. The axis of the fan 23 is the ventilation direction of the fan 23. The normal line of the plane where the first opening 211 is located is the ventilation direction of the first opening 211, and the normal line of the plane where the second opening 212 is located is the ventilation direction of the second opening 212. In this embodiment, by the positional relationship among the fan 23, the first opening 211, and the second opening 212, the bending angle and the number of bends of the air duct can be defined.

[0055] Among them, the air duct formed by the air duct shell 21 has at least the following structural forms:

[0056] First, as Figure 7 , Figure 9 and Figure 12 show, the axis of the fan 23 is perpendicular to the normal line of the plane where the first opening 211 is located and the normal line of the plane where the second opening 212 is located respectively.

[0057] Among them, the plane where the first opening 211 is located is parallel to the plane where the second opening 212 is located, and the ventilation direction of the fan 23 is perpendicular to the ventilation directions of the first opening 211 and the second opening 212.

[0058] Among them, the ventilation directions of the first opening 211 and the second opening 212 can be 180° or 0°.

[0059] In this embodiment, the air duct is bent at least in two sections. The first opening 211 and the second opening 212 with the same opening direction are respectively arranged at the head and the tail. When the fan 23 forces the air flow to flow in the air duct, the propagation path of the air flow sound wave passes through at least two reversals. One reversal point is between the first opening 211 and the air duct wall, and the other reversal point is between the second opening 212 and the air duct wall. The sound energy is reflected into the air duct, and the remaining part of the sound energy is refracted and transmitted towards the outlet of the air duct, thereby reducing the sound energy transmitted out of the air duct and achieving the noise reduction effect.

[0060] Second, the axis of the fan 23 forms an angle with the normal line of the plane where the first opening 211 is located and the normal line of the plane where the second opening 212 is located respectively.

[0061] Among them, the ventilation direction of the fan 23 can form an angle with the ventilation direction of the first opening 211, the ventilation direction of the fan 23 can form an angle with the ventilation direction of the second opening 212. The ventilation direction of the fan 23 is inclined with respect to the ventilation directions of the first opening 211 and the second opening 212. The normal lines of the planes where the first opening 211 and the second opening 212 are located can be relatively inclined or relatively parallel.

[0062] In this embodiment, the ventilation direction of the fan 23 is inclined with respect to the ventilation direction of the first opening 211 and the ventilation direction of the second opening 212, so that the airflow driven by the fan 23 can be reversed at least twice at the first opening 211 and the second opening 212.

[0063] In some embodiments, as Figure 7 , Figure 9 and Figure 12 shown, the first opening 211 and the second opening 212 are spaced apart on the air duct, and the projections of the first opening 211 and the second opening 212 in the same direction do not overlap, so as to avoid the situation that the airflow directly flows out between the first opening 211 and the second opening 212 without being reversed.

[0064] In some embodiments, as Figure 7 , Figure 9 and Figure 12 shown, the cross-sectional area of the first opening 211 is larger than the cross-sectional area of the second opening 212, and the first opening 211 is rectangular.

[0065] In this embodiment, the cross-sectional area of the first opening 211 communicating with the air inlet or outlet of the heat dissipation shell 13 is larger than the cross-sectional area of the second opening 212 communicating with the outside, so that the air volume from the heat dissipation shell 13 to the air duct shell 21 can be increased, the refraction of sound waves in the air duct shell 21 can be increased, the sound energy transmitted from the second opening 212 can be reduced, and the noise reduction effect of the air duct shell 21 on the fan 23 can be further realized.

[0066] Among them, the first opening 211 is rectangular, and the rectangular first opening 211 is adapted to the ventilation openings 214 of most of the heat dissipation shells 13 of the boxes 1, so that the use scenarios of the noise reduction device 2 can be increased.

[0067] Among them, the first opening 211 can communicate with the heat dissipation shells 13 of multiple boxes 1, and the length of the first opening 211 can be set according to the installation quantity of the boxes 1, so as to realize the heat dissipation of multiple boxes 1 by one noise reduction device 2. Since the number of fans 23 is reduced, the overall volume of the power conversion device can be reduced, and the noise pollution of the power conversion device can be reduced.

[0068] In some embodiments, as Figure 7 , Figure 9 and Figure 12 shown, the cross-sectional area of the first opening 211 is larger than the cross-sectional area of the second opening 212.

[0069] In this embodiment, the cross-sectional area of the first opening 211 communicating with the air inlet or outlet of the heat dissipation housing 13 is larger than that of the second opening 212 communicating with the outside, so that the air volume from the heat dissipation housing 13 into the air duct housing 21 can be increased, the refraction of sound waves in the air duct housing 21 can be increased, the sound energy transmitted out through the second opening 212 can be reduced, and further the noise reduction effect of the air duct housing 21 on the fan 23 can be realized.

[0070] In some embodiments, such as Figure 3 and Figure 4 shown, the first opening 211 is rectangular.

[0071] In this embodiment, the first opening 211 is rectangular, and the rectangular first opening 211 is adapted to the ventilation openings 214 of most of the heat dissipation housings 13 of the enclosures 1, so that the usage scenarios of the noise reduction device 2 can be increased.

[0072] Among them, the first opening 211 can communicate with the heat dissipation housings 13 of multiple enclosures 1, and the length of the first opening 211 can be set according to the installation quantity of the enclosures 1, so as to realize the heat dissipation of a noise reduction device 2 for multiple enclosures 1. Since the number of fans 23 is reduced, the overall volume of the power conversion device can be reduced, and the noise pollution of the power conversion device can be reduced.

[0073] In some embodiments, Figure 13 、 Figure 14 and Figure 15 shown, the enclosure 1 includes multiple ones, and the multiple heat dissipation housings 13 of the multiple enclosures 1 are all communicated with the first opening 211. It can provide air volume to assist in heat dissipation for the radiator of one enclosure 1, or can also provide air volume to assist in heat dissipation for the radiators of multiple enclosures 1, so as to facilitate the centralized noise reduction treatment of the noise of multiple devices.

[0074] In some embodiments, 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 21. The sound absorption layer on the wall surface can absorb and attenuate the sound energy to improve the noise reduction effect.

[0075] Among them, the sound absorption layer can be a porous material, a foam material or other types of sound absorption materials.

[0076] In some embodiments, the noise reduction device 2 includes a sound absorption layer, and the sound absorption layer is disposed opposite to the air outlet side of the fan 23.

[0077] The sound absorption layer can be connected to the inner wall of the air duct housing 21, and the sound absorption layer and the inner wall of the air duct housing 21 can be connected by means of pasting or clamping.

[0078] The wall surface of the air duct housing 21 disposed opposite to the air outlet side of the fan 23 is provided with a sound absorption layer, and the other wall surfaces of the air duct housing 21 can also be provided with a sound absorption layer, or can not be provided with a sound absorption layer, and the noise reduction effect can be realized in both cases.

[0079] In this embodiment, as Figure 7 , Figure 9 and Figure 12 shown, due to the directivity of the sound waves of the fan 23, 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 23, and an acoustic absorption layer is attached to this wall surface. A part of the sound energy is absorbed and attenuated by the acoustic absorption layer on the wall surface, a part of the sound energy is reflected into the air duct inside the air duct housing 21, and only a small part of the sound energy changes direction and propagates to the outside. Thus, compared with the original way of the fan 23 directly releasing the sound energy to the outside in the back-inlet mode, the noise reduction device 2 significantly reduces the sound energy propagated by the fan 23 to the outside and achieves the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0080] In some embodiments, acoustic absorption layers are provided on the inner walls of the air duct, which can increase the sound energy absorbed and attenuated by the acoustic absorption layer on the wall surface and further achieve the noise reduction effect.

[0081] In some embodiments, as Figure 10 , Figure 11 and Figure 12 shown, the air duct housing 21 further includes a cover body 22. The cover body 22 includes a first opening 221 and a second opening 222 that are connected and communicate with each other. The cover body 22 includes multiple sections that are bent. The first opening 221 communicates with the second opening 212, and the second opening 222 is used to communicate with the outside.

[0082] Among them, the normal of the plane where the first opening 221 is located and the normal of the plane where the second opening 222 is located have an included angle. The included angle between the normal of the plane where the first opening 221 is located and the normal of the plane where the second opening 222 is located can be 30° to 120°. Exemplarily, the included angle between the normal of the plane where the first opening 221 is located and the normal of the plane where the second opening 222 is located can be 90°, 60° or 30°.

[0083] In this embodiment, the cover body 22 can cover the second opening 212 of the air duct housing 21. Since the cover body 22 has multiple sections that are bent, the air flow in the air duct housing 21 still needs to change the direction and be reflected in the sound wave propagation path after flowing into the cover body 22 from the second opening 212. Part of the sound energy is reflected back into the air duct from the second opening 212, thereby reducing the sound energy transmitted out of the air duct housing 21 and further achieving the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0084] In some embodiments, as Figure 10 and Figure 11 shown, a plurality of second openings 222 are provided, and the plurality of second openings 222 are spaced apart to further increase the sound energy reflected back into the air duct from the second opening 212, thereby further reducing the sound energy transmitted out of the air duct housing 21 and increasing the noise reduction effect. The arrow direction in the figure indicates the sound wave propagation direction.

[0085] In some embodiments, such as Figure 8 and Figure 9 shown, the air duct housing 21 further includes a baffle 213. The baffle 213 is located inside the air duct, and the baffle 213 is disposed between the blower 23 and the second opening 212. One end of the baffle 213 is spaced apart from the air duct housing 21 to form a ventilation opening 214. The other end of the baffle 213 is connected to the air duct housing 21. The ventilation opening 214 is located at the end of the baffle 213 away from the second opening 212; the first opening 211, the ventilation opening 214, and the second opening 212 are sequentially communicated to form an air duct.

[0086] Wherein, the baffle 213 is disposed at the air outlet of the blower 23, and the baffle 213 is disposed opposite to the air outlet of the blower 23. The sound energy generated by the blower 23 is reflected by the baffle 213, and part of the reflected sound energy is enclosed in the air duct, thereby reducing the sound energy transmitted from inside the air duct housing 21.

[0087] It should be noted that the design of the baffle 213 can obstruct the sound energy. Part of the medium and high frequency energy has a short wavelength and weak diffraction ability, and it is difficult to bypass the baffle 213 and transmit out of the air duct.

[0088] Wherein, the cross-sectional area of the ventilation opening 214 formed by the baffle 213 spaced apart from the air duct housing 21 can be determined according to the specifications of the air duct housing 21 and the blower 23. The first opening 211 and the second opening 212 are communicated through the ventilation opening 214.

[0089] In this embodiment, by providing the baffle 213, the length of the air duct can be increased, and at the same time, the number of bends of the air duct is increased, thereby increasing the number of times of air flow commutation in the air duct, increasing the number of times of flow direction change of the propagation path of the air flow sound wave, increasing the amount of sound energy reflection, reducing the sound energy transmitted from inside the air duct, and further improving the noise reduction effect.

[0090] In some embodiments, such as Figure 9 shown, the normal line of the baffle 213 is perpendicular to the normal line of the plane where the second opening 212 is located.

[0091] In this embodiment, the extending direction of the baffle 213 is perpendicular to the plane where the second opening 212 is located, and the normal line of the plane where the ventilation opening 214 is located is perpendicular to the normal line of the plane where the second opening 212 is located, increasing the length and the number of bends of the air duct. The propagation path of the sound wave between the ventilation opening 214 and the second opening 212 undergoes at least one commutation, further reducing the sound energy transmitted from inside the air duct housing 21.

[0092] In some embodiments, such as Figure 4 and Figure 7As shown, the air duct housing 21 further includes a mounting plate 215. The end of the mounting plate 215 is connected to the inner wall of the air duct housing 21 to divide the air duct into a first part and a second part. The first part is provided with a first opening 211, and the second part is provided with a second opening 212. The air duct housing 21 is provided with an avoidance opening 216. The first part and the second part communicate through the avoidance opening 216, and the fan 23 is installed in the avoidance opening 216.

[0093] Wherein, the avoidance opening 216 can be a hole penetrating through the mounting plate 215, and the housing of the fan 23 is connected to the avoidance opening 216.

[0094] In this embodiment, the second opening 222, the first opening 211, the ventilation opening 214, the avoidance opening 216 and the second opening 212 communicate to form an air duct. Since the cross-sectional area of the avoidance opening 216 is smaller than the area of the surface where the mounting plate 215 is located, the air duct contracts at the avoidance opening 216, and the sound energy is blocked at the contraction. Part of the medium and high frequency energy has a short wavelength and weak diffraction ability, and it is difficult to diffract around the mounting plate 215 and transmit out from the avoidance opening 216, increasing the noise reduction effect.

[0095] In some embodiments, such as Figure 4 、 Figure 6 、 Figure 8 and Figure 10 As shown, the air duct housing 21 further includes a cover plate 28. The air duct housing 21 is provided with a mounting opening, and the cover plate 28 is detachably installed in the mounting opening. After the fan 23 and the mounting plate 215 are assembled, they are placed into the air duct through the mounting opening and assembled with the air duct housing 21. After the air duct housing 21 and the mounting plate 215 are assembled, the cover plate 28 covers the mounting opening to block the mounting opening, reducing the leakage amount of sound waves from the mounting opening, improving the noise reduction effect, and simplifying the assembly difficulty of the fan 23, the mounting plate 215 and the air duct housing 21.

[0096] In some embodiments, a sealing strip is provided on the end face of the first opening 211 of the air duct. When the air duct housing 21 is installed on the box body 1, the sealing strip is clamped between the end face of the first opening 211 and the box body 1.

[0097] In this embodiment, by providing a sealing ring, the sealing performance at the connection between the box body 1 and the air duct housing 21 can be increased, reducing the situations of sound leakage and air leakage.

[0098] In some embodiments, such as Figure 4 、 Figure 6 、 Figure 8 and Figure 10 As shown, the first opening 211 of the air duct is provided with a folded edge 217, and the folded edge 217 extends circumferentially around the first opening 211; a sealing strip is provided on the outer side of the folded edge 217. When the air duct housing 21 is installed on the box body 1, the sealing strip is clamped between the folded edge 217 and the box body 1.

[0099] In this embodiment, by providing a hem and a sealing ring, the connection area between the box body 1 and the air duct housing 21 can be increased, thereby increasing the sealing performance at the connection between the box body 1 and the air duct housing 21, and further reducing the cases of sound leakage and air leakage.

[0100] In some embodiments, the hem 217 can be connected to the box body by fasteners 27 such as bolts or screws.

[0101] In some embodiments, such as Figure 4 、 Figure 5 and Figure 13 as shown, a connecting member 25 is provided at the connection between the box body 1 and the air duct housing 21. One end of the connecting member 25 is connected to the box body 1, and the other end of the connecting member 25 is connected to the air duct housing 21 to increase the connection reliability between the box body 1 and the air duct housing 21.

[0102] Among them, the connecting member 25 can be a plate structure or a rib structure, such as a sheet metal plate or a sheet metal strip.

[0103] In some embodiments, such as Figure 13 as shown, the power conversion device further includes a sound barrier 26, and at least a part of the sound barrier 26 is disposed opposite to the second opening 212 of the air duct.

[0104] Among them, a sound barrier 26 is provided at the second opening 212 of the air duct, which can change the propagation path of sound waves.

[0105] In this embodiment, by providing a sound barrier 26 at the second opening 212, the outward propagation of sound energy can be reduced, achieving a noise reduction effect.

[0106] According to the power conversion device provided by the present application, by providing a baffle 213 with a reflecting function in the air duct housing 21, laying sound-absorbing materials on the inner wall surfaces of the air duct housing 21 and the wall surface of the baffle 213, and providing a cover body 22 and a sound barrier 26 at the second opening 212 of the air duct, based on the principles of sound absorption and noise reduction and reflection and diffraction, the outward propagation of sound energy can be reduced, and there is an obvious noise reduction effect.

[0107] The embodiment of the present application further provides a noise reduction device 2, which is applied to the power conversion device in any of the above embodiments. The noise reduction device 2 includes: an air duct housing 21 and a fan 23. The air duct housing 21 includes a first opening 211 and a second opening 212. The first opening 211 and the second opening 212 are communicated to form an air duct, and the air duct includes multiple sections arranged in a bent manner; the fan 23 is disposed in the air duct.

[0108] According to the noise reduction device 2 provided by the embodiments of the present application, by installing the noise reduction device 2 on the power conversion device, a blower 23 is provided inside the noise reduction device 2, and the blower 23 is installed inside the noise reduction device 2 outside the box body 1. On the one hand, the specification selection of the air duct shell 21 and the blower 23 can be increased. The installation space of the blower 23 can be increased by expanding the size of the air duct, so that a blower 23 with a large size, low speed and low noise can be selected, the noise generated by the blower 23 can be reduced, and the noise reduction effect on the power conversion device can be improved. At the same time, since the noise reduction device 2 is arranged outside the box body, it is also convenient for disassembling and assembling the noise reduction device 2 and for maintenance. On the other hand, in terms of structural space, adjusting the blower 23 from being installed inside the box body 1 to being installed outside the box body 1 can increase the space for stacking the blower 23 front and back. By increasing the distance between the obstacles in front and behind the blower 23 and the air inlet and outlet of the blower 23, the eddy current noise of the air flow flowing through the obstacles can be effectively reduced, thereby improving the noise reduction effect on the power conversion device.

[0109] 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 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 type, 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, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0110] 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 should not be construed as a limitation of the present application.

[0111] In the description of the present application, the "first feature", "second feature" may include one or more of such features.

[0112] In the description of the present application, "a plurality of" means two or more.

[0113] 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 indirect contact between the first and second features through additional features therebetween.

[0114] In the description of the present application, the first feature being "above", "over" or "on top of" the second feature includes the first feature being directly above or obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature.

[0115] In the description of this specification, the description of reference terms such as "one embodiment", "some embodiments", "illustrative 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.

[0116] 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. 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 shell and a heat dissipation shell; Electronic devices, which are arranged inside the equipment shell; A noise reduction device, which includes a duct shell and a fan. The duct shell includes a first opening and a second opening. The first opening and the second opening are connected to form a duct. The duct includes multiple sections arranged in a bent manner. The first opening is connected to the heat dissipation shell, and the second opening is used to communicate with the outside. The fan is arranged inside the duct.

2. The power conversion device according to claim 1, characterized in that, The axis of the fan intersects the normal of the plane where the first opening is located and the normal of the plane where the second opening is located respectively.

3. The power conversion device according to claim 2, characterized in that, The axis of the fan is perpendicular to the normal of the plane where the first opening is located and the normal of the plane where the second opening is located respectively.

4. The power conversion device according to claim 1, characterized in that The cross-sectional area of the first opening is larger than that of the second opening; and / or, the first opening is rectangular.

5. The power conversion device according to claim 1, characterized in that, The noise reduction device includes a sound absorption layer, which is arranged opposite to the air outlet side of the fan.

6. The power conversion device according to any one of claims 1-5, characterized in that The duct shell further includes a cover body, which includes a first port and a second port that are connected. The cover body includes multiple sections arranged in a bent manner. The first port is connected to the second opening, and the second port is used to communicate with the outside.

7. The power conversion device according to any one of claims 1-5, characterized in that The duct shell further includes a baffle, which is located inside the duct and is arranged between the fan and the second opening. One end of the baffle is spaced apart from the duct shell to form a ventilation opening, and the other end is connected to the duct shell. The ventilation opening is located at the end of the baffle away from the second opening; The first opening, the ventilation opening and the second opening are sequentially connected to form the duct.

8. The power conversion device according to claim 7, characterized in that, The normal of the baffle is perpendicular to the normal of the plane where the second opening is located.

9. The power conversion device according to any one of claims 1-5, characterized in that, There are multiple box bodies, and the heat dissipation shells of the multiple box bodies are all connected to the first opening.

10. The power conversion device according to any one of claims 1-5, characterized in that, The power conversion device further includes a sound barrier, and at least part of the sound barrier is arranged opposite to the second opening of the duct.

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: A duct shell, which includes a first opening and a second opening. The first opening and the second opening are connected to form a duct. The duct includes multiple sections arranged in a bent manner; A fan, which is arranged inside the duct.

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