Air duct assembly and electrical cabinet

Abstract

The utility model discloses an air duct assembly and an electrical cabinet. The air duct assembly comprises a first housing and a second housing. The first shell is provided with a first air duct; the second shell and the first shell are arranged in the first direction, and the second shell is provided with a second air duct; the second shell is suitable for being matched with the first shell so that the first air channel can communicate with the second air channel. The second shell at least protrudes relative to one surface of the first shell so as to guarantee the heat dissipation effect or be conveniently connected with other elements, the second shell is further suitable for being separated relative to the first shell, so that the elements are allowed to be mounted or dismounted in the first direction, only the second shell needs to be separated from the first shell, the first shell does not need to be dismounted, and the mounting and dismounting efficiency is improved. Therefore, the maintenance is more convenient.

Description

Technical Field

[0001] This utility model relates to the field of heat dissipation devices, specifically to an air duct assembly and an electrical cabinet. Background Technology

[0002] In existing electrical cabinets, the air duct is usually integrally molded and fixed inside the cabinet. The air duct is connected to the air vents on the cabinet door for air intake or exhaust. The air duct usually has a larger section in a place where there are no components inside the cabinet to achieve a larger airflow in a compact space, thereby increasing the heat dissipation effect. However, when the cabinet door is opened and the internal components need to be accessed from one side of the door, some components are blocked by this larger section of the air duct, making it impossible to disassemble them from the door side. The entire air duct must be disassembled. However, the air duct usually has a certain length and multiple connection points to achieve a stable connection with the cabinet. The disassembly of the air duct is also difficult, which increases the overall maintenance time and the precision required for operation, thus increasing maintenance costs. Utility Model Content

[0003] The purpose of this utility model is to overcome the above-mentioned defects or problems existing in the background art or to provide a material basis for overcoming the above-mentioned defects or problems existing in the background art, and to provide a duct assembly and an electrical cabinet.

[0004] To achieve the above objectives, the present invention and its preferred embodiments adopt the following technical solutions, but the embodiments are not limited to the following solutions:

[0005] Option 1, an air duct component, including

[0006] The first housing has a first air duct;

[0007] The second housing is arranged along a first direction with the first housing and has a second air duct; it is adapted to cooperate with the first housing so that the first air duct and the second air duct are connected; the second housing protrudes from at least one surface of the first housing and is also adapted to detach from the first housing.

[0008] Option 2, based on Option 1, involves gradually increasing the ventilation area of ​​the second air duct along a direction away from the first air duct.

[0009] Option 3, based on Option 2, has an air outlet in the second air duct, and the first and second air ducts pass through the air in sequence. Along the direction closer to the air outlet, the ventilation area of ​​the second air duct gradually increases.

[0010] Alternatively, the second air duct may be equipped with an air inlet, and air flows through the second air duct and the first air duct in sequence. Along the direction away from the air inlet, the ventilation area of ​​the second air duct gradually decreases.

[0011] Option 4, based on Option 1, the second air duct is provided with an air outlet or an air inlet, the bottom surface of the second air duct is inclined downward along the direction close to the air outlet or the air inlet, and / or the air outlet or the air inlet is provided with waterproof louvers.

[0012] Option 5, based on Option 1, also includes a sealing element. When the second housing and the first housing are engaged, their positions are fixed to each other and the sealing element is pressed to seal the connection between the first air duct and the second air duct.

[0013] Option six, based on option one, also includes filter cotton, which is adapted to be detachably installed in the second air duct.

[0014] Option 7, based on Option 6, involves attaching the filter cotton to the second air duct using Velcro.

[0015] Option 8, based on Option 6 or Option 7, further includes an elastic element installed in the second air duct and adapted to be embedded in the filter cotton.

[0016] Option 9, an electrical cabinet, includes a cabinet body, a cabinet door, a first object, and an air duct assembly as described in any one of Options 1 to 8, wherein the cabinet door is adapted to open or close relative to the cabinet body, and the cabinet door is provided with an air hole communicating with one end of the second air duct opposite to the first air duct; the first object is adapted to be installed or removed relative to the cabinet body along a first direction when the cabinet door is open and the second housing is detached relative to the first housing.

[0017] Option 10, based on Option 9, involves fixing the second housing to the cabinet door, with the second housing sealingly abutting against the first housing.

[0018] As can be seen from the above description of the present invention and its preferred embodiments, compared with the prior art, the technical solution of the present invention and its preferred embodiments have the following beneficial effects due to the adoption of the following technical means:

[0019] 1. In Scheme 1 and its preferred embodiments, a duct assembly includes a first housing and a second housing.

[0020] The first casing is provided with a first air duct;

[0021] The second housing is arranged along the first housing in the first direction, and the second housing is provided with a second air duct; the second housing is adapted to cooperate with the first housing so that the first air duct and the second air duct are connected.

[0022] The second housing protrudes from at least one surface relative to the first housing to expand the second airflow channel to ensure heat dissipation or facilitate connection with other components. Because the second housing protrudes from the surface of the first housing, if a component located on one side of the first housing is installed along the first direction and close to the first housing, or disassembled along the first direction and away from the first housing, the protrusion will obstruct its installation or disassembly path, making installation or disassembly inconvenient. The second housing is also suitable for detaching from the first housing, allowing components to be installed or disassembled along the first direction simply by separating the second housing from the first housing, without disassembling the first housing, thus facilitating maintenance.

[0023] 2. In Scheme 2 and its preferred embodiments, the ventilation area of ​​the second air duct gradually increases along the direction away from the first air duct, which can reduce turbulence, reduce wind resistance, and thus make the airflow smooth and increase the air volume.

[0024] 3. In Scheme 3 and its preferred embodiments, the second air duct is provided with an air outlet, and the first air duct and the second air duct pass through in sequence. Along the direction closer to the air outlet, the ventilation area of ​​the second air duct gradually increases, thereby increasing the air volume.

[0025] Alternatively, the second air duct may have an air inlet. The second air duct and the first air duct pass through the air in sequence. Along the direction away from the air inlet, the ventilation area of ​​the second air duct gradually decreases, thereby increasing the air intake and guiding the air.

[0026] 4. In Scheme 4 and its preferred embodiments, the second air duct is provided with an air outlet or an air inlet, and the bottom surface of the second air duct slopes downward along the direction close to the air outlet or air inlet, so that water will flow out along the slope, improving the waterproof effect and increasing the air passage area.

[0027] And / or the air outlet or air inlet is equipped with waterproof louvers, thereby achieving a waterproof effect through the waterproof louvers.

[0028] 5. In Scheme 5 and its preferred embodiments, a sealing element is also included. When the second housing and the first housing are sealed together, their positions are fixed to each other and the sealing element is squeezed to seal the connection between the first air duct and the second air duct, thereby preventing air leakage at the connection, which could damage other components or reduce the heat dissipation effect.

[0029] 6. In Scheme 6 and its preferred embodiments, a filter cotton is also included. The filter cotton is suitable for detachable installation in the second air duct to achieve dust prevention and other effects, and is easy to replace.

[0030] 7. In Scheme 7 and its preferred embodiments, the filter cotton is attached to the second air duct by Velcro, which facilitates installation and disassembly.

[0031] 8. In Scheme 8 and its preferred embodiments, an elastic element is also included. The elastic element is installed in the second air duct and is suitable for embedding the filter cotton, so as to limit the shaking of the filter cotton or increase the strength of the filter cotton.

[0032] 9. In Scheme 9 and its preferred embodiments, an electrical cabinet includes a cabinet body, a cabinet door, a first object and the aforementioned air duct assembly. The cabinet door is adapted to be opened or closed relative to the cabinet body, and the cabinet door is provided with an air hole communicating with one end of the second air duct away from the first air duct. The first object is adapted to be installed or removed relative to the cabinet body along a first direction when the cabinet door is open and the second housing is detached relative to the first housing.

[0033] 10. In Scheme Nine and its preferred embodiments, the second housing is fixedly connected to the cabinet door, allowing it to move accordingly to detach from or seal with the first housing when the cabinet door is opened or closed. This eliminates the need for operation of the second housing, making it more convenient. Furthermore, the cabinet door remains in the same position relative to the cabinet body when closed, maintaining a tight seal and ensuring greater stability. The sealed contact between the second housing and the first housing is also easier to achieve than methods like a sealed plug-in connection, without affecting the opening or closing of the cabinet door. Attached Figure Description

[0034] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of some parts of the electrical cabinet in Example 1;

[0036] Figure 2 This is a schematic diagram of the first housing in Embodiment 1;

[0037] Figure 3 This is a schematic diagram of the assembly of the second housing and the cabinet door in Embodiment 1;

[0038] Figure 4 This is a perspective view of the second housing in Embodiment 1;

[0039] Figure 5 This is a schematic diagram of the structure of the second shell in Embodiment 1;

[0040] Figure 6 This is a diagram showing the sealing fit between the first housing and the second housing in Example 1.

[0041] Explanation of key figure labels:

[0042] First housing 1; First air duct 11; Second housing 2; Second air duct 21; Grid plate 22; Sealing element 3; Filter cotton 4; Elastic element 5; Waterproof louvers 6; Cabinet door 7; First object 8; Cabinet body 9; First direction 10. Detailed Implementation

[0043] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0044] Unless otherwise expressly defined, the use of terms such as "first," "second," or "third" in the claims, description, and drawings of this utility model is for distinguishing different objects and not for describing a specific order.

[0045] Unless otherwise expressly defined, in the claims, description, and accompanying drawings of this utility model, the use of directional terms such as "center," "lateral," "longitudinal," "horizontal," "vertical," "top," "bottom," "inner," "outer," "upper," "lower," "front," "rear," "left," "right," "clockwise," and "counterclockwise" to indicate orientation or positional relationships is based on the orientation and positional relationships shown in the accompanying drawings and is only for the convenience of describing the invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific scope of protection of the invention.

[0046] Unless otherwise expressly defined, the terms "fixed connection" or "fixed connection" used in the claims, description and drawings of this utility model shall be interpreted broadly to refer to any connection in which there is no displacement or relative rotation relationship between the two parties, including non-removable fixed connection, detachable fixed connection, integral connection and fixed connection through other devices or components.

[0047] In the claims, description and accompanying drawings of this utility model, the terms "comprising", "having", and variations thereof are used to mean "including but not limited to".

[0048] refer to Figures 1-6 An electrical cabinet includes a cabinet body 9, a cabinet door 7, a first object 8, and an air duct assembly.

[0049] The air duct assembly includes a first housing 1, a second housing 2, a sealing element 3, a filter cotton 4, an elastic element 5, and waterproof louvers 6. It should be understood that the air duct assembly in this application does not include the corresponding air vents on the cabinet door 7 or cabinet body 9.

[0050] Cabinet 9 ( Figure 1 (Only a portion of the structure of cabinet 9 is shown in the image.) The cabinet 9 is suitable for housing a heating element, a first object 8, and an air duct assembly. Cabinet 9 has an access hole extending along a first direction 10. The first direction 10 is as follows: Figure 1 As shown.

[0051] The cabinet door 7 is adapted to open or close relative to the cabinet body 9 to open or block the access hole. The cabinet door 7 is provided with a vent (not shown in the figure). In this embodiment, the cabinet body 9 and the cabinet door 7 are rotatably connected. Of course, in some implementations, the cabinet body 9 and the cabinet door 7 may be in a sliding connection or other form that allows relative movement.

[0052] refer to Figure 1 The first object 8 is adapted to be installed or removed from the cabinet 9 along the first direction 10 to be inserted into or removed from the cabinet 9. When the second housing 2 mates with the first housing 1, the first object 8 is removed from or inserted into the cabinet 9 along the first direction 10, subject to interference from the second housing 2. In this embodiment, the first object 8 is a bus capacitor, located below the first housing 1. The bus capacitor stabilizes the bus voltage and ensures efficient system operation. After being installed in the cabinet 9, it also achieves corresponding connections and fixation with other components. Of course, in other embodiments, the first object 8 can be other components. In this embodiment, the first object 8 should be considered as components arranged in different areas within the cabinet 9, and the first object 8 is not inside the air duct assembly.

[0053] refer to Figure 1 , Figure 2 The first housing 1 is installed inside the cabinet 9 and located on the upper side of the cabinet 9. The first housing 1 can be installed in the cabinet 9 by means of screws, welding, etc. The first housing 1 is provided with a first air duct 11, and the air inlet of the first air duct 11 is connected to the heat dissipation channel of the heat-generating element inside the cabinet 9.

[0054] refer to Figure 3 , Figure 4The second housing 2 is fixed to the cabinet door 7, such as by screws or welding, and is located above the cabinet door 7. The second housing 2 and the first housing 1 are arranged along the first direction 10. The second housing 2 is provided with a second air duct 21. In this embodiment, the air inlet end of the second air duct 21 is connected to the air outlet end of the first air duct 11 (i.e., air passes through the first air duct 11 and the second air duct 21 in sequence), and the air outlet end of the second air duct 21 is connected to a vent, which is used for air outlet. The second housing 2 is adapted to seal with the first housing 1 so that the first air duct 11 and the second air duct 21 are sealed and connected. In this embodiment, the second housing 2 and the first housing 1 are sealed and abutted. In this embodiment, the corresponding seal is achieved by a sealing element 3. The second housing 2 and the first housing 1 are sealed and abutted to achieve a sealing fit. When sealed, the two are fixed in position and press the sealing element 3 so that the sealing element 3 seals the connection between the first air duct 11 and the second air duct 21, thereby achieving a sealing effect.

[0055] Specifically, the seal 3 is installed on the first housing 1 or the second housing 2. For example, the first housing 1 or the second housing 2 has a sealing groove with an opening facing the other and suitable for installing the seal 3. The opening of the sealing groove can be along the first direction 10 or perpendicular to the first direction 10. Alternatively, the seal 3 can be engaged with the first air duct 11 or the second air duct 21, such as... Figure 5 The sealing element 3 engages with the second air duct 21. In this embodiment, refer to... Figure 6 As the cabinet door 7 closes, the first housing 1 and the second housing 2 gradually approach each other, and the sealing element 3 begins to press against the second housing 2 (if the sealing element 3 is installed on the first housing 1), and begins to deform until the cabinet door 7 is closed. At this time, since the second housing 2 is fixed to the cabinet door 7 and the first housing 1 is installed and fixed inside the cabinet body 9, when the cabinet door 7 is closed, the cabinet door 7 cooperates with the cabinet body 9 and does not move relative to the cabinet body 9. Therefore, the positions of the second housing 2 and the first housing 1 are fixed to each other, which can maintain the state of squeezing the sealing element 3 and maintain the sealing effect.

[0056] refer to Figure 1 , Figure 5 The second housing 2 protrudes from at least one surface relative to the first housing 1. In this embodiment, to increase the airflow area, the second housing 2 protrudes from the surface of the first housing 1. Specifically, the ventilation area of ​​the second air duct 21 gradually increases along the direction away from the first air duct 11. In this embodiment, the end of the second air duct 21 away from the first air duct 11 is provided with an air outlet (i.e., the air outlet end of the second air duct 21), which is connected to the air hole. Along the direction close to the air outlet, the ventilation area of ​​the second air duct 21 gradually increases. Specifically, the bottom surface of the second air duct 21 slopes downward along the direction close to the air outlet, increasing the airflow area, reducing wind resistance, and also serving a waterproof function. Figure 1As shown, this also causes the lower surface of the second housing 2 to protrude relative to the lower surface of the first housing 1. Since the second housing 2 is located on the path for disassembling or installing the bus capacitor, it makes it difficult to easily disassemble or install the bus capacitor. Therefore, the second housing 2 is also suitable for detaching from the first housing 1, thereby preventing interference and facilitating the disassembly or installation of the bus capacitor. Specifically, in this embodiment, when the cabinet door 7 is opened, the second housing 2 moves with the cabinet door 7 to detach from the first housing 1, thereby facilitating the installation or disassembly of the bus capacitor relative to the cabinet 9 along the first direction 10.

[0057] refer to Figure 5 The waterproof louvers 6 are suitable for installation at the air outlet of the second air duct 21 of the second housing 2. The waterproof louvers 6 are existing technology and will not be described in detail here. In other embodiments, the waterproof louvers 6 can also be installed on the cabinet door 7.

[0058] refer to Figure 4 , Figure 5 The filter cotton 4 is suitable for detachable installation within the second air duct 21 to achieve a filtering function. Specifically, the filter cotton 4 is attached to the second air duct 21 via Velcro. The second air duct 21 has several grid plates 22, and the filter cotton 4 is attached to the grid plates 22 via Velcro. During installation, the filter cotton 4 is inserted into the second air duct 21 from the end closest to the first air duct 11. In other embodiments, the filter cotton 4 can also be installed via detachable connections such as snap-fit ​​or fasteners.

[0059] refer to Figure 4 , Figure 5 The elastic element 5 is installed inside the second air duct 21 and is adapted to embed the filter cotton 4. In this embodiment, the elastic element 5 is a wave-shaped spring to increase the embedding area. The two ends of the elastic element 5 are respectively fixed inside the second air duct 21 and located on the side of the grid plate 22 facing the filter cotton 4. When the filter cotton 4 is pasted on the grid plate 22, the elastic element 5 is embedded in the filter cotton 4. Multiple elastic elements 5 can be provided.

[0060] An optional disassembly / assembly process in this embodiment:

[0061] During installation and disassembly, opening cabinet door 7 allows the second housing 2 to detach from the first housing 1, enabling the first object 8 to be placed into cabinet 9 along the first direction 10. Closing cabinet door 7 then seals the second housing 2 against the first housing 1. During use, air flows through the first air duct 11, the second air duct 21, and the vents sequentially for heat dissipation. When maintenance of the first object 8 is required, opening cabinet door 7 allows the second housing 2 to detach from the first housing 1 along with cabinet door 7, enabling the first object 8 to be removed from cabinet 9 along the first direction 10.

[0062] In the above, the first air duct 11 and the second air duct 21 pass through the air in sequence. In other embodiments, the second air duct 21 and the first air duct 11 pass through the air in sequence. At this time, the second air duct 21 is provided with an air inlet, which is connected to the air hole. The air hole is used for air intake. Along the direction away from the air inlet, the ventilation area of ​​the second air duct 21 gradually decreases, and the bottom surface of the second air duct 21 is inclined downward along the direction close to the air inlet. Filter cotton 4 and elastic element 5 can also be installed in the second air duct 21. Waterproof louvers 6 are installed at the air inlet.

[0063] Furthermore, in the above-mentioned case, the second housing 2 is fixed to the cabinet door 7 to reduce the action of disassembling the second housing 2. However, in other embodiments, the second housing 2 may not be fixed to the cabinet door 7. The second housing 2 is detachably connected to the first housing 1 or the cabinet body 9. For example, the second housing 2 may be inserted into the first air duct 11 or sleeved on the first housing 1 and installed on the first housing 1 by means of fastener connection, snap-fit, etc. Then, the sealing element 3 is installed appropriately. The sealing element 3 abuts against the first housing 1 and the second housing 2 to achieve the sealing of the air duct.

[0064] Compared with the prior art, this embodiment has the following beneficial effects:

[0065] In one exemplary embodiment, a duct assembly includes a first housing 1 and a second housing 2.

[0066] The first housing 1 is provided with a first air duct 11;

[0067] The second housing 2 and the first housing 1 are arranged along the first direction 10. The second housing 2 is provided with a second air duct 21. The second housing 2 is adapted to cooperate with the first housing 1 so that the first air duct 11 and the second air duct 21 are connected.

[0068] The second housing 2 protrudes from at least one surface relative to the first housing 1 to expand the second air duct 21 to ensure heat dissipation or facilitate connection with other components. Because the second housing 2 protrudes from the surface of the first housing 1, if a component located on one side of the first housing 1 is installed along the first direction 10 and close to the first housing 1, or disassembled along the first direction 10 and away from the first housing 1, the protrusion will obstruct its installation or disassembly path, making installation or disassembly inconvenient. The second housing 2 is also suitable for detaching from the first housing 1, thereby allowing components to be installed or disassembled along the first direction 10. Only the second housing 2 needs to be separated from the first housing 1, without disassembling the first housing 1, thus making maintenance more convenient.

[0069] In one exemplary embodiment, the ventilation area of ​​the second air duct 21 gradually increases along the direction away from the first air duct 11, which can reduce turbulence, reduce wind resistance, thereby making the airflow smooth and increasing the air volume.

[0070] In one exemplary embodiment, the second air duct 21 is provided with an air outlet, and the first air duct 11 and the second air duct 21 pass through the air in sequence. Along the direction close to the air outlet, the ventilation area of ​​the second air duct 21 gradually increases, thereby increasing the air volume.

[0071] Alternatively, the second air duct 21 may be provided with an air inlet. The second air duct 21 and the first air duct 11 pass through the air in sequence. Along the direction away from the air inlet, the ventilation area of ​​the second air duct 21 gradually decreases, thereby increasing the air intake and guiding the air.

[0072] In one exemplary embodiment, the second air duct 21 is provided with an air outlet or an air inlet, and the bottom surface of the second air duct 21 is inclined downward along the direction close to the air outlet or air inlet, so that water will flow out along the inclined surface, improving the waterproof effect and increasing the air passage area.

[0073] The air outlet or air inlet is equipped with waterproof louvers 6, thereby achieving a waterproof effect through the waterproof louvers 6.

[0074] In one exemplary embodiment, a sealing element 3 is also included. When the second housing 2 and the first housing 1 are engaged, their positions are fixed to each other and the sealing element 3 is pressed together so that the sealing element 3 seals the connection between the first air duct 11 and the second air duct 21, thereby preventing air leakage at the connection, which could damage other components or reduce the heat dissipation effect.

[0075] In one exemplary embodiment, a filter cotton 4 is also included, which is adapted to be detachably installed in the second air duct 21 to achieve dust prevention and other effects, and to facilitate replacement.

[0076] In one exemplary embodiment, the filter cotton 4 is attached to the second air duct 21 by Velcro, thereby facilitating installation and removal.

[0077] In one exemplary embodiment, an elastic element 5 is also included. The elastic element 5 is installed in the second air duct 21 and is adapted to be embedded in the filter cotton 4, so as to limit the shaking of the filter cotton 4 or increase the strength of the filter cotton 4.

[0078] In one exemplary embodiment, an electrical cabinet includes a cabinet body 9, a cabinet door 7, a first object 8, and the aforementioned air duct assembly. The cabinet door 7 is adapted to be opened or closed relative to the cabinet body 9. The cabinet door 7 is provided with an air hole communicating with one end of the second air duct 21 that is away from the first air duct 11. The first object 8 is adapted to be installed or removed relative to the cabinet body 9 along a first direction 10 when the cabinet door 7 is open and the second housing 2 is detached relative to the first housing 1, thus having the beneficial effects brought about by the aforementioned air duct assembly.

[0079] In one exemplary embodiment, the second housing 2 is fixedly connected to the cabinet door 7, so that when the cabinet door 7 is opened or closed, the second housing 2 can move accordingly to disengage from or seal with the first housing 1 without requiring operation of the second housing 2, which is more convenient. Furthermore, when the cabinet door 7 is closed, its position relative to the cabinet body 9 remains unchanged, maintaining a sealed state that is not easily disengaged, resulting in more stable use. Moreover, the sealing contact between the second housing 2 and the first housing 1 is easier to achieve than sealing insertion methods, and does not affect the opening or closing of the cabinet door 7.

[0080] The foregoing description of the specifications and embodiments is intended to explain the scope of protection of this utility model, but does not constitute a limitation on the scope of protection of this utility model. Modifications, equivalent substitutions, or other improvements to the embodiments of this utility model or a portion thereof that can be obtained by those skilled in the art through logical analysis, reasoning, or limited experimentation, based on the teachings of this utility model or the foregoing embodiments, should all be included within the scope of protection of this utility model.

Claims

1. A duct assembly, characterized in that: include The first housing (1) is provided with a first air duct (11); The second housing (2) is arranged along the first housing (1) in the first direction (10) and is provided with a second air duct (21); it is adapted to cooperate with the first housing (1) so that the first air duct (11) and the second air duct (21) are connected; the second housing (2) protrudes from at least one surface of the first housing (1) and is also adapted to detach from the first housing (1).

2. The air duct assembly as described in claim 1, characterized in that: Along the direction away from the first air duct (11), the ventilation area of ​​the second air duct (21) gradually increases.

3. The air duct assembly as described in claim 2, characterized in that: The second air duct (21) is provided with an air outlet. The first air duct (11) and the second air duct (21) pass through the air in sequence. Along the direction close to the air outlet, the ventilation area of ​​the second air duct (21) gradually increases. Alternatively, the second air duct (21) may be provided with an air inlet, and the second air duct (21) and the first air duct (11) may pass through the air in sequence. Along the direction away from the air inlet, the ventilation area of ​​the second air duct (21) gradually decreases.

4. The air duct assembly as described in claim 1, characterized in that: The second air duct (21) is provided with an air outlet or an air inlet. The bottom surface of the second air duct (21) is inclined downward along the direction close to the air outlet or the air inlet, and / or the air outlet or the air inlet is provided with waterproof louvers (6).

5. A duct assembly as described in claim 1, characterized in that: It also includes a seal (3). When the second housing (2) is engaged with the first housing (1), the two are fixed in position and squeeze the seal (3) so that the seal (3) seals the connection between the first air duct (11) and the second air duct (21).

6. A duct assembly as described in claim 1, characterized in that: It also includes a filter cotton (4) which is adapted to be detachably installed in the second air duct (21).

7. A duct assembly as described in claim 6, characterized in that: The filter cotton (4) is attached to the second air duct (21) by Velcro.

8. A duct assembly as described in claim 6 or 7, characterized in that: It also includes an elastic element (5), which is installed in the second air duct (21) and is adapted to be embedded in the filter cotton (4).

9. An electrical cabinet, characterized in that: The device includes a cabinet (9), a cabinet door (7), a first object (8), and an air duct assembly as described in any one of claims 1-8. The cabinet door (7) is adapted to open or close relative to the cabinet (9), and the cabinet door (7) is provided with an air hole communicating with one end of the second air duct (21) away from the first air duct (11). The first object (8) is adapted to be installed or removed relative to the cabinet (9) in a first direction (10) when the cabinet door (7) is open and the second housing (2) is detached relative to the first housing (1).

10. An electrical cabinet as described in claim 9, characterized in that: The second housing (2) is fixed to the cabinet door (7), and the second housing (2) is in sealed contact with the first housing (1).

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