A frequency converter box assembly with an electromagnetic interference shielding layer

Abstract

This utility model discloses a frequency converter enclosure assembly with an anti-electromagnetic interference shielding layer, belonging to the technical field of frequency converter enclosure assemblies. It includes an enclosure and a hinged door on the front of the enclosure. The door is equipped with a sealing component. Openings are provided at the lower ends of both sides of the enclosure, and dustproof components are installed inside the openings. Cooling fans are installed on both sides of the enclosure above the openings. A metal shielding frame is installed inside the enclosure. This utility model can achieve efficient heat dissipation while ensuring the airtightness and anti-electromagnetic interference performance of the frequency converter enclosure. The concave design increases the flow path and improves heat exchange efficiency. Simultaneously, airflow through the top of the metal shielding frame and the gaps in the heat-conducting plate carries away heat. This dual-path rapid heat dissipation prevents heat accumulation and eliminates the need for numerous ventilation holes. It maintains the enclosure's airtightness to prevent impurities from entering while ensuring anti-electromagnetic interference effectiveness, thus ensuring stable operation of the frequency converter.

Description

Technical Field

[0001] This utility model relates to a frequency converter enclosure assembly, and more particularly to a frequency converter enclosure assembly with an anti-electromagnetic interference shielding layer, belonging to the technical field of frequency converter enclosure assembly. Background Technology

[0002] A frequency converter (VDC) is a power control device that uses frequency conversion technology and microelectronics to control AC motors by switching industrial semiconductor devices and changing the frequency of the motor's power supply. A VDC mainly consists of a rectifier, filter, braking unit, drive unit, detection unit, and microprocessor unit. In modern industrial automation, VDCs are widely used in complex electromagnetic environments such as industrial workshops as core equipment for motor speed regulation and energy saving. However, they are prone to electromagnetic interference and are susceptible to external interference, leading to reduced control accuracy and unstable operation. Therefore, VDC enclosure components with electromagnetic interference shielding layers have emerged. These components include the enclosure body and the shielding layer. The shielding layer blocks electromagnetic interference through reflection and absorption mechanisms, and commonly uses metal or composite shielding materials.

[0003] Current technologies still have shortcomings:

[0004] In the fields of modern industrial automation and power electronics, inverter enclosures need to combine electromagnetic interference protection with airtightness. Airtightness can prevent dust, oil, and other contaminants from entering, avoiding internal circuit failures and adapting to harsh industrial conditions. However, excessive airtightness can hinder airflow, making it difficult for the inverter to dissipate heat and causing components to overheat. Usually, ventilation holes are opened to dissipate heat, but this will compromise the integrity of the enclosure and reduce electromagnetic interference protection performance.

[0005] To address this issue, a frequency converter enclosure assembly with an electromagnetic interference shielding layer was designed. Utility Model Content

[0006] The main purpose of this utility model is to provide a frequency converter housing assembly with an anti-electromagnetic interference shielding layer to solve the problems mentioned in the background art.

[0007] The objective of this utility model can be achieved by adopting the following technical solution:

[0008] An inverter enclosure assembly with an anti-electromagnetic interference shielding layer includes an enclosure and a door hinged to the front of the enclosure. The door is equipped with a sealing component. Openings are provided at the lower ends of both sides of the enclosure. Dustproof components are provided inside the openings. Cooling fans are installed on both sides of the enclosure and above the openings. A metal shielding frame is installed inside the enclosure. Recessed metal shielding plates are welded to both sides of the metal shielding frame. Heat dissipation plates are evenly arranged on the opposite sides of the recessed metal shielding plates. Heat-conducting plates are symmetrically and evenly arranged on the top of the metal shielding frame, and the ends of the heat-conducting plates are fixedly connected to the top of the heat dissipation plates.

[0009] Preferably, the sealing assembly includes a limiting rod and a movable metal shielding plate. The limiting rod is evenly installed at the four corners inside the door. The movable metal shielding plate is slidably installed between the ends of the limiting rod. A metal shielding strip is installed on the side of the movable metal shielding plate near the box body. The outline shape of the metal shielding strip is adapted to the shape of the outer edge of the metal shielding frame and the concave metal shielding plate. A bolt is rotatably installed at the middle position on the side of the movable metal shielding plate away from the metal shielding strip. An inner thread is connected to the outer thread of the bolt, and the inner thread is fixedly installed through and in the middle position of the door.

[0010] Preferably, the dustproof component includes a mounting frame and a filter screen. The mounting frame is located inside the opening, and one side of the mounting frame extends to the outside of the opening. A through groove is provided on the top of the mounting frame, and a limiting groove is provided on the inner bottom wall of the mounting frame. The filter screen is engaged inside the limiting groove, and the outer side of the filter screen is slidably connected to the inside of the through groove. A baffle is fixed on the top of the filter screen.

[0011] Preferably, the mounting frame is a right-angled trapezoidal frame, and the filter screen is inclinedly set at the bottom of the baffle.

[0012] Preferably, the limiting rod passes through the movable metal shielding plate and extends to the outside of the movable metal shielding plate. A connecting hole is provided at the connection between the movable metal shielding plate and the limiting rod. A baffle is fixed to the end of the limiting rod.

[0013] Preferably, the top of the baffle is provided with a rotating block, and the outer side of the rotating block is provided with anti-slip texture.

[0014] Preferably, the end of the bolt is fixed with a handle, and the handle is a non-slip handle.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. This utility model, through the combined use of a housing, door, opening, cooling fan, metal shielding frame, concave metal shielding plate, heat dissipation plate, and heat conduction plate, can achieve efficient heat dissipation while ensuring the airtightness and electromagnetic interference protection performance of the inverter housing. The concave design increases the flow path and improves heat exchange efficiency. At the same time, air flows through the top of the metal shielding frame and the gap of the heat conduction plate to remove heat. The dual path quickly removes internal heat, avoiding heat accumulation. There is no need to open a large number of heat dissipation holes. It maintains the airtightness of the housing to prevent impurities from entering and ensures the electromagnetic interference protection effect, ensuring the stable operation of the inverter.

[0017] 2. This utility model utilizes a combination of a limiting rod, a metal shielding plate, a metal shielding strip, bolts, and an internal threaded tube. By rotating the bolts, the movable metal shielding plate and the metal shielding strip are moved to fit against the outer edge of the metal shielding frame and the concave metal shielding plate. This causes the metal shielding frame, the concave metal shielding plate, the movable metal shielding plate, and the metal shielding strip to form a more tightly sealed space, significantly reducing electromagnetic leakage paths, greatly improving the electromagnetic interference protection effect, and strengthening the space sealing to prevent external impurities from entering, thus providing more reliable electromagnetic protection for the stable operation of the frequency converter.

[0018] 3. This utility model, through the combined use of the mounting frame, filter screen, baffle, limiting groove and through groove, enables quick installation by cooperating with the mounting frame and limiting groove. It can pre-filter the air entering the inlet and the box, effectively blocking dust and ensuring the cleanliness of internal components. The filter screen can be removed for cleaning by lifting the baffle upwards. The operation is convenient, maintaining the dustproof effect while reducing the difficulty of maintenance, and is suitable for long-term use. Attached Figure Description

[0019] Figure 1 This is the front view of the present invention;

[0020] Figure 2 This is a schematic diagram showing the connection between the metal shielding frame and the heat sink of this utility model.

[0021] Figure 3 This is a bottom structural diagram of the box door of this utility model;

[0022] Figure 4 This is a sectional view of the mounting frame of this utility model.

[0023] In the picture: 1. Box body; 2. Box door;

[0024] 3. Sealing assembly; 301. Limiting rod; 302. Movable metal shielding plate; 303. Metal shielding strip; 304. Bolt; 305. Internal threaded tube;

[0025] 4. Opening;

[0026] 5. Dustproof components; 501. Mounting frame; 502. Filter screen; 503. Baffle; 504. Limiting groove; 505. Through groove;

[0027] 6. Cooling fan; 7. Metal shielding frame; 8. Recessed metal shielding plate; 9. Heat sink; 10. Heat conduction plate. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0029] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0030] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0031] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0032] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not 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 a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0033] Example 1

[0034] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes a frequency converter enclosure assembly with an anti-electromagnetic interference shielding layer, including an enclosure 1 and an enclosure door 2 hinged to the front of the enclosure 1. The enclosure door 2 is provided with a sealing component 3. Both sides of the enclosure 1 have openings 4 at their lower ends. Dustproof components 5 are provided inside the openings 4. Cooling fans 6 are installed on both sides of the enclosure 1 above the openings 4. A metal shielding frame 7 is installed inside the enclosure 1. Recessed metal shielding plates 8 are welded to both sides of the metal shielding frame 7. Heat dissipation plates 9 are evenly arranged on the sides of the recessed metal shielding plates 8 that are far apart from each other. Heat conducting plates 10 are symmetrically and evenly arranged on the top of the metal shielding frame 7, and the ends of the heat conducting plates 10 are fixedly connected to the top of the heat dissipation plates 9.

[0035] The heat generated by the inverter inside the metal shielding frame 7 and the recessed metal shielding plate 8 is conducted to the metal shielding frame 7 and the recessed metal shielding plate 8, and then transferred to the heat dissipation plate 9 and the heat conduction plate 10 on the outside through thermal conduction. After the cooling fan 6 is turned on, the air outside the housing 1 enters the housing 1 through the opening 4. Under the guidance and division of the heat dissipation plate 9, the airflow is evenly distributed and flows through the outside of the recessed metal shielding plate 8. Because the recessed metal shielding plate 8 adopts a recessed structure design, the airflow path is extended, which significantly improves the heat exchange efficiency between the air and the recessed metal shielding plate 8, causing the heat to be carried away. Then the airflow is discharged from the cooling fan 6. At the same time, some of the air entering through the opening 4 rises to the top middle position along the front and rear sides of the metal shielding frame 7, and is located in the end area of ​​the heat conduction plate 10. It then enters the gap between the evenly distributed heat conduction plates 10 through the space at the end of the heat conduction plate 10, and exchanges heat with the heat accumulated on the top of the metal shielding frame 7. Finally, it is also discharged to the outside of the housing 1 through the cooling fan 6.

[0036] Example 2

[0037] The solution in Example 1 will be further described below with reference to its specific working method.

[0038] like Figure 1 and Figure 3 As shown, in a preferred embodiment, based on the above method, the sealing assembly 3 further includes a limiting rod 301 and a movable metal shielding plate 302. The limiting rod 301 is evenly installed at the four corners of the inner side of the box door 2. The movable metal shielding plate 302 is slidably installed between the ends of the limiting rod 301. A metal shielding strip 303 is installed on the side of the movable metal shielding plate 302 near the box body 1. The outline shape of the metal shielding strip 303 is adapted to the shape of the outer edge of the metal shielding frame 7 and the concave metal shielding plate 8. A bolt 304 is rotatably installed at the middle position of the side of the movable metal shielding plate 302 away from the metal shielding strip 303. An inner threaded tube 305 is threaded to the outer side of the bolt 304, and the inner threaded tube 305 is fixedly installed through and fixed at the middle position of the box door 2.

[0039] After installing the frequency converter inside the metal shielding frame 7, close the enclosure door 2 and lock it to the enclosure 1, thus closing the enclosure door 2 and enclosure 1 to form a closed space. Then, rotate the bolt 304. With the thread engagement of the internal threaded tube 305, the bolt 304 extends into the enclosure 1. Simultaneously, the bolt 304 pushes the movable metal shielding plate 302 and the metal shielding strip 303 into the enclosure 1 until the movable metal shielding plate 302 contacts the ends of the metal shielding frame 7 and the concave metal shielding plate 8. The limiting rod 301 then engages with the movable metal shielding plate. The sliding direction of 302 serves as a guide to prevent the movable metal shielding plate 302 from shifting during movement, ensuring that the metal shielding strip 303 can accurately fit with the outer edge of the metal shielding frame 7 and the concave metal shielding plate 8. The fit between the metal shielding strip 303 and the outer edge of the metal shielding frame 7 and the concave metal shielding plate 8 creates a more enclosed space with the metal shielding frame 7, the concave metal shielding plate 8, the metal shielding strip 303, and the movable metal shielding plate 302, thereby improving the electromagnetic interference protection effect.

[0040] like Figure 1 and Figure 4 As shown, in a preferred embodiment, based on the above method, the dustproof component 5 further includes a mounting frame 501 and a filter screen 502. The mounting frame 501 is located inside the opening 4, and one side of the mounting frame 501 extends to the outside of the opening 4. A through groove 505 is provided on the top of the mounting frame 501, and a limiting groove 504 is provided on the inner bottom wall of the mounting frame 501. The filter screen 502 is engaged inside the limiting groove 504, and the outer side of the filter screen 502 is slidably connected to the inside of the through groove 505. A baffle 503 is fixed on the top of the filter screen 502.

[0041] Insert the filter screen 502 into the through groove 505 at the top of the mounting frame 501, and move the filter screen 502 downwards until the bottom of the filter screen 502 is inserted into the limiting groove 504, which serves to limit the filter screen 502. At the same time, the bottom of the baffle 503 contacts the top of the mounting frame 501, completing the installation of the filter screen 502. This allows the air entering the inlet 4 to first pass through the filter screen 502, and after being filtered by the filter screen 502, it enters the inlet 4 and the housing 1, thus preventing dust. In addition, lifting the baffle 503 upwards allows the filter screen 502 to be removed from the mounting frame 501 for cleaning, making the operation convenient.

[0042] like Figure 1 and Figure 4 As shown, in a preferred embodiment, based on the above method, the mounting frame 501 is a right-angled trapezoidal frame, and the filter screen 502 is inclinedly arranged at the bottom of the baffle 503.

[0043] The mounting frame 501 adopts a right-angled trapezoidal structure, which, together with the inclined filter screen 502, can increase the contact area between the filter screen 502 and the air, improve the dust filtration efficiency, and prevent dust from accumulating quickly and causing blockage. On the other hand, the inclined structure can reduce the accumulation of dust that falls naturally onto the filter screen 502.

[0044] like Figure 1 and Figure 3 As shown, in a preferred embodiment, based on the above method, the limiting rod 301 further penetrates the movable metal shielding plate 302 and extends to the outside of the movable metal shielding plate 302. A connecting hole is provided at the connection between the movable metal shielding plate 302 and the limiting rod 301, and a baffle is fixed at the end of the limiting rod 301.

[0045] The baffle prevents the movable metal shielding plate 302 from falling off the limiting rod 301, thereby improving the structural stability of the sealing assembly 3.

[0046] like Figure 1 and Figure 4 As shown, in a preferred embodiment, based on the above method, the top of the baffle 503 is provided with a rotating block, and the outer side of the rotating block is provided with anti-slip texture.

[0047] The rotating block increases the friction between the hand and the rotating block. When the filter screen 502 needs to be removed for cleaning, the operator can easily lift the baffle 503 upwards through the rotating block, avoiding hand slippage and inconvenience.

[0048] like Figure 3 As shown, in a preferred embodiment, based on the above method, the end of the bolt 304 is further fixed with a handle, and the handle is a non-slip handle.

[0049] The anti-slip handle eliminates the need for wrenches or other tools, allowing operators to directly rotate the adjusting bolt 304 by hand. This simplifies the sealing process of the door 2 and improves installation and maintenance efficiency.

[0050] Example 3

[0051] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0052] Insert the filter screen 502 into the through groove 505 at the top of the mounting frame 501. Under the action of gravity, the filter screen 502 moves downward until its bottom is locked into the limiting groove 504 to achieve the limiting. At this time, the bottom of the baffle 503 is in contact with the top of the mounting frame 501, and the installation of the filter screen 502 is completed. When the filter screen 502 needs to be cleaned, simply lift the baffle 503 upward to remove the filter screen 502 from the mounting frame 501. The operation is convenient.

[0053] After installing the frequency converter inside the metal shielding frame 7, close the enclosure door 2 to form an initial enclosed space with the enclosure 1. Then, rotate the bolt 304. Under the threaded engagement of the bolt 304 and the inner threaded tube 305, the bolt 304 extends into the enclosure 1, simultaneously pushing the movable metal shielding plate 302 and the metal shielding strip 303 to move until the movable metal shielding plate 302 is in close contact with the ends of the metal shielding frame 7 and the concave metal shielding plate 8, and the metal shielding strip 303 is in contact with the outer edges of both ends. Finally, the metal shielding frame 7, the concave metal shielding plate 8, the metal shielding strip 303, and the movable metal shielding plate 302 form a highly sealed space, significantly improving the electromagnetic interference protection effect.

[0054] The heat generated by the inverter operation is first conducted to the metal shielding frame 7 and the concave metal shielding plate 8, and then transferred to the outer heat dissipation plate 9 and heat conduction plate 10 through thermal conduction. After the cooling fan 6 is started, the air flowing in from the opening 4 is first filtered by the filter screen 502 in the dustproof component 5 inside the opening 4 to remove dust and impurities before entering the housing 1. Some of the air flows directly upward and is evenly distributed under the guiding and dividing effect of the heat dissipation plate 9. It flows past the outside of the concave metal shielding plate 8. Because the concave structure of the concave metal shielding plate 8 extends the airflow path, it significantly improves the heat exchange efficiency. The heat is carried away by the airflow and discharged from the cooling fan 6.

[0055] Some air rises along the front and rear sides of the metal shielding frame 7 to the top middle of the metal shielding frame 7 and the end area of ​​the heat conduction plate 10. It enters the gap between the heat conduction plates 10 through the end space and completes heat exchange with the heat accumulated on the top of the metal shielding frame 7. Finally, it is also discharged to the outside of the box 1 through the cooling fan 6, realizing efficient heat dissipation through dual paths.

[0056] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A frequency converter cabinet assembly with an electromagnetic interference shielding layer, comprising a cabinet (1) and a cabinet door (2) hingedly mounted on the front face of the cabinet (1), characterized in that: A sealing component (3) is provided on the door (2). Openings (4) are provided at the lower ends of both sides of the box body (1). A dustproof component (5) is provided inside the opening (4). A cooling fan (6) is installed on both sides of the box body (1) and above the opening (4). A metal shielding frame (7) is installed inside the box body (1). A concave metal shielding plate (8) is welded on both sides of the metal shielding frame (7). A heat dissipation plate (9) is evenly provided on the side of the concave metal shielding plate (8) that is far apart from each other. A heat conduction plate (10) is symmetrically and evenly provided on the top of the metal shielding frame (7). The ends of the heat conduction plate (10) are fixedly connected to the top of the heat dissipation plate (9).

2. The frequency converter cabinet assembly with an electromagnetic interference shielding layer according to claim 1, characterized in that: The sealing assembly (3) includes a limiting rod (301) and a movable metal shielding plate (302). The limiting rod (301) is evenly installed at the four corners of the inner side of the box door (2). The movable metal shielding plate (302) is slidably installed between the ends of the limiting rod (301). A metal shielding strip (303) is installed on the side of the movable metal shielding plate (302) close to the box body (1). The outline shape of the metal shielding strip (303) is adapted to the shape of the outer edge of the metal shielding frame (7) and the concave metal shielding plate (8). A bolt (304) is rotatably installed at the middle position of the side of the movable metal shielding plate (302) away from the metal shielding strip (303). An inner threaded tube (305) is connected to the outer thread of the bolt (304), and the inner threaded tube (305) is fixedly installed through the middle position of the box door (2).

3. The frequency converter cabinet assembly with an electromagnetic interference shielding layer of claim 1, wherein: The dustproof component (5) includes a mounting frame (501) and a filter screen (502). The mounting frame (501) is located inside the opening (4), and one side of the mounting frame (501) extends to the outside of the opening (4). A through groove (505) is provided on the top of the mounting frame (501). A limiting groove (504) is provided on the inner bottom wall of the mounting frame (501). The filter screen (502) is engaged inside the limiting groove (504), and the outer side of the filter screen (502) is slidably connected to the inside of the through groove (505). A baffle (503) is fixed on the top of the filter screen (502).

4. The frequency converter enclosure assembly with an electromagnetic interference shielding layer of claim 3, wherein: The mounting frame (501) is a right-angled trapezoidal frame, and the filter screen (502) is inclinedly set at the bottom of the baffle (503).

5. The frequency converter enclosure assembly with an electromagnetic interference shielding layer of claim 2, wherein: The limiting rod (301) passes through the movable metal shielding plate (302) and extends to the outside of the movable metal shielding plate (302). A connecting hole is provided at the connection between the movable metal shielding plate (302) and the limiting rod (301). A baffle is fixed at the end of the limiting rod (301).

6. The frequency converter enclosure assembly with an electromagnetic interference shielding layer of claim 3, wherein: The top of the baffle (503) is provided with a rotating block, and the outer side of the rotating block is provided with anti-slip texture.

7. The frequency converter enclosure assembly with an electromagnetic interference shielding layer of claim 2, wherein: The end of the bolt (304) is fixed with a handle, and the handle is a non-slip handle.

Images