High-protection closed frequency converter

Abstract

The utility model provides a high protective closed frequency converter applied to the frequency converter field, comprising a housing and a packaging aluminum plate, one side of the housing is provided with a sealing ring and a buckling groove, and the packaging aluminum plate is provided with a packaging bump and a sealing assembly; the sealing assembly comprises a first L-shaped annular plate and a second L-shaped annular plate, the first L-shaped annular plate is fixed to the packaging protruding block, a double-layer elastic buckle is fixed between the bottom of the first L-shaped annular plate and the bottom of the second L-shaped annular plate, and the double-layer elastic buckle is matched with the inner contour of the buckling groove; and a sealing sponge is clamped between the L-shaped annular plate I and the L-shaped annular plate II. According to the utility model, the innovatively designed double-layer elastic buckle is tightly matched with the buckling groove, and the extrusion sealing of the sealing sponge is combined, so that a unique multi-stage sealing structure is formed, dust and liquid are effectively prevented from invading, reliable guarantee is provided for stable operation of the frequency converter, high integration of sealing and heat dissipation functions is realized, and the structure is compact and stable.

Description

Technical Field

[0001] This application relates to the field of frequency converters, and in particular to a highly protective sealed frequency converter. Background Technology

[0002] With the development of Industry 4.0 and intelligent manufacturing, frequency converters, as core equipment in electric drive systems, directly impact industrial production efficiency and energy utilization efficiency through their performance and reliability. However, existing frequency converters have significant shortcomings in their adaptability to harsh environments. Traditional frequency converter protection structures often employ simple sealing strips or bolt fastening methods. Sealing strips are susceptible to aging and hardening due to factors such as temperature and chemical corrosion, and bolts are prone to loosening under equipment vibration, resulting in decreased protective performance and inability to prevent dust and liquid intrusion. According to industry statistics, traditional frequency converters used in dusty environments experience failure rates exceeding 35% due to dust intrusion, severely impacting equipment operational stability and production continuity.

[0003] In terms of heat dissipation, traditional frequency converters mostly rely on single air cooling or simple heat sink designs. Single air cooling is insufficient for heat dissipation efficiency during high-power operation, making it difficult to quickly remove large amounts of heat; simple heat sinks are prone to dust accumulation, further reducing heat dissipation performance. Taking a certain model of traditional frequency converter as an example, after two hours of continuous high-load operation, the internal temperature can reach 85℃, far exceeding the normal operating temperature range of electronic components (40-60℃), accelerating component aging, shortening equipment life, and increasing maintenance costs and downtime risks.

[0004] Furthermore, the maintenance of traditional frequency converters is complex, and the sealed structure is difficult to disassemble, resulting in long maintenance times and high costs. Related data shows that a single maintenance of a traditional frequency converter takes an average of about 4 hours and requires professional technicians, leading to high maintenance costs. Therefore, developing a frequency converter with high protection, efficient heat dissipation, and convenient maintenance has become an urgent need in the industry. Utility Model Content

[0005] The purpose of this application is to address the problems of poor protection performance, low heat dissipation efficiency, and difficult maintenance of existing frequency converters. Compared with the prior art, it provides a highly protective sealed frequency converter, including a housing and an encapsulation aluminum plate fastened to one side of the housing. A circuit board is fixed inside the housing, and a frequency converter coil is provided on the circuit board. An encapsulation opening is provided on one side of the housing. A sealing ring and a fastening groove are provided inside the encapsulation opening. An encapsulation protrusion matching the encapsulation opening is provided on the encapsulation aluminum plate. A sealing component that cooperates with the fastening groove is fixed on the outside of the encapsulation protrusion.

[0006] The sealing assembly includes an L-shaped ring plate one and an L-shaped ring plate two. The L-shaped ring plate one is fixed on the encapsulation protrusion. A double-layer elastic buckle is fixed between the bottom of the L-shaped ring plate one and the bottom of the L-shaped ring plate two. The double-layer elastic buckle matches the inner contour of the buckle groove. The side of the L-shaped ring plate one is provided with a disassembly bolt through a threaded groove. The bottom end of the disassembly bolt is slidably connected to the top end of the L-shaped ring plate two.

[0007] A sealing sponge is also sandwiched between the L-shaped ring plate one and the L-shaped ring plate two.

[0008] Furthermore, the aluminum plate is provided with heat dissipation fins on the side away from the outer shell. The heat dissipation fins are separated by a partition and have an inner cavity. The heat dissipation fins are provided with a liquid dissipation notch in the partition. The aluminum plate is fixed with a guide tube in the liquid dissipation notch. One end of the guide tube is connected to a number of nozzles that are evenly distributed at equal angles. The other end of the guide tube is provided with a conical groove. A water-absorbing sponge is fixed in the conical groove.

[0009] A magnetic elastic plate is fixed to the side of the encapsulation bump opposite to the outer shell, and a conical plug is fixed to the side of the magnetic elastic plate away from the outer shell. The conical plug matches the inner contour of the conical groove.

[0010] Furthermore, the bottom of the inner cavity and the sealing sponge are both connected to the water-absorbing sponge through a guide fiber bundle.

[0011] Furthermore, the magnetic elastic plate has elasticity close to the outer shell, and the nozzle is a one-way atomizing nozzle.

[0012] Furthermore, an elastic bellows is fixed to the circumferential side of the port of the conical groove, and the end of the elastic bellows away from the conical groove is glued and fixed to the outer wall of the magnetic elastic plate.

[0013] Compared to existing technologies, the advantages of this application are:

[0014] This innovative design features a double-layer elastic buckle that fits tightly with the locking groove, combined with the compression seal of the sealing sponge, forming a unique multi-level sealing structure that effectively prevents dust and liquid intrusion, providing a reliable guarantee for the stable operation of the frequency converter. The design of components such as the heat dissipation fins, guide pipes, nozzles, and magnetic elastic plates utilizes the changing magnetic field generated when the frequency converter coil is running. This magnetic field drives the magnetic elastic plate to reciprocate elastically, triggering coolant circulation. The nozzles atomize and spray the coolant, allowing for thorough heat exchange with the air within the inner cavity of the heat dissipation fins. This invention achieves a high degree of integration of sealing and heat dissipation functions through the design of components such as the magnetic elastic plate and elastic bellows, resulting in a compact and stable structure. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this application;

[0016] Figure 2 This is a schematic diagram of the exploded structure of this application;

[0017] Figure 3 This is a schematic diagram of the front structure of the encapsulation aluminum plate proposed in this application;

[0018] Figure 4 This is a cross-sectional structural diagram of this application;

[0019] Figure 5 for Figure 4 Enlarged structural diagram of section A in the middle;

[0020] Figure 6 for Figure 4 A magnified structural diagram of section B.

[0021] Explanation of the labels in the diagram:

[0022] 1. Outer shell; 11. Encapsulation port; 12. Sealing ring; 13. Fastening groove; 2. Encapsulation aluminum plate; 21. Heat dissipation fins; 22. Encapsulation bump; 23. Partition plate; 24. Inner cavity; 25. Discharge notch; 3. Circuit board; 31. Frequency converter coil; 4. Sealing assembly; 41. L-shaped ring plate one; 42. L-shaped ring plate two; 43. Double-layer elastic buckle; 44. Removal bolt; 5. Magnetic elastic plate; 6. Flow guiding fiber bundle; 7. Sealing sponge; 8. Flow guiding tube; 81. Nozzle; 82. Absorbent sponge; 83. Elastic corrugated tube; 84. Conical groove; 9. Conical plug. Detailed Implementation

[0023] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments in this application without creative effort are within the scope of protection of this application.

[0024] Example:

[0025] This utility model provides a highly protective, sealed frequency converter. Please refer to [link / reference]. Figures 1-6 The device includes a housing 1 and an encapsulation aluminum plate 2 fastened to one side of the housing 1. A circuit board 3 is fixed inside the housing 1. A frequency converter coil 31 is provided on the circuit board 3. An encapsulation opening 11 is provided on one side of the housing 1. A sealing ring 12 and a fastening groove 13 are provided inside the encapsulation opening 11. An encapsulation protrusion 22 that matches the encapsulation opening 11 is provided on the aluminum plate 2. A sealing component 4 that cooperates with the fastening groove 13 is fixed on the outside of the encapsulation protrusion 22.

[0026] The sealing assembly 4 includes an L-shaped ring plate 41 and an L-shaped ring plate 42. The L-shaped ring plate 41 is fixed on the encapsulation protrusion 22. A double-layer elastic buckle 43 is fixed between the bottom of the L-shaped ring plate 41 and the L-shaped ring plate 42. The double-layer elastic buckle 43 matches the inner contour of the fastening groove 13 and can fit tightly against the inner wall of the fastening groove 13 when fastened, forming the first sealing line. The side of L-shaped ring plate 41 is provided with a disassembly bolt 44 through a threaded groove. The bottom end of the disassembly bolt 44 is slidably connected to the top end of L-shaped ring plate 42. By rotating the disassembly bolt 44, the position of L-shaped ring plate 42 can be easily controlled. The sealing component 4 is fastened and disassembled by the compression deformation of the double-layer elastic buckle 43 by L-shaped ring plate 42. A sealing sponge 7 is also sandwiched between L-shaped ring plate 41 and L-shaped ring plate 42. Under the fastening and compression of L-shaped ring plate 41 and L-shaped ring plate 42, the sealing sponge 7 further fills the gap, enhances the sealing effect, and forms a second sealing line. At the same time, after the sealing sponge 7 absorbs water, it will squeeze L-shaped ring plate 41 and L-shaped ring plate 42, causing the double-layer elastic buckle 43 to expand outward, further improving the fastening and sealing performance of the double-layer elastic buckle 43 to the fastening groove 13.

[0027] The aluminum plate 2 is provided with heat dissipation fins 21 on the side away from the outer shell 1. The heat dissipation fins 21 are separated into an inner cavity 24 by a partition 23. The heat dissipation fins 21 are provided with a liquid dissipation notch 25 in the partition 23. The aluminum plate 2 is fixed with a guide tube 8 in the liquid dissipation notch 25. One end of the guide tube 8 is connected to a number of nozzles 81 that are evenly distributed at equal angles. The other end of the guide tube 8 is provided with a conical groove 84. A water-absorbing sponge 82 is fixed in the conical groove 84. A magnetic elastic plate 5 is fixed on the side of the encapsulation protrusion 22 opposite to the outer shell 1. A conical plug 9 is fixed on the side of the magnetic elastic plate 5 away from the outer shell 1. The conical plug 9 matches the inner contour of the conical groove 84.

[0028] Furthermore, the bottom of the inner cavity 24 and the sealing sponge 7 are connected to the water-absorbing sponge 82 through the guide fiber bundle 6, so that the cooling water can circulate within the system.

[0029] The magnetic elastic plate 5 has elasticity close to the outer shell 1, which can provide a certain pre-tightening force when fastened to ensure the sealing effect. The nozzle 81 is a one-way atomizing nozzle, which can atomize and spray cooling water, increasing the contact area between cooling water and air and improving heat dissipation efficiency. An elastic bellows 83 is also fixed to the circumferential side of the port of the conical groove 84. The end of the elastic bellows 83 away from the conical groove 84 is glued and fixed to the outer wall of the magnetic elastic plate 5. While ensuring the sealing of cooling water, the elastic bellows 83 can adapt to the movement of the magnetic elastic plate 5.

[0030] In the actual manufacturing process, the outer shell 1 is made of high-strength aluminum alloy. During the die-casting mold design stage, the structure of the outer shell 1 is optimized through finite element analysis to ensure that it meets the high strength requirements while reducing weight. The encapsulation port 11 on one side of the outer shell 1 is milled using a high-precision CNC machining center, with the machining accuracy controlled within ±0.03mm to ensure the precise dimensions of the encapsulation port 11. A sealing ring 12 and a fastening groove 13 are installed inside the encapsulation port 11. The sealing ring 12 is made of fluororubber with excellent high-temperature resistance, oil resistance, and aging resistance, and is manufactured through a molding process to ensure a tight fit with the inner wall of the encapsulation port 11. The fastening groove 13 is formed by stamping and then precision machined by CNC, with its dimensional accuracy strictly controlled within ±0.02mm to achieve precise matching with the sealing component 4.

[0031] The encapsulation aluminum plate 2 is precision milled to set the encapsulation bumps 22. A sealing component 4 is installed on the outside of the encapsulation bumps 22. The L-shaped ring plate 41 is fixed to the encapsulation bumps 22 using laser welding, ensuring welding strength and stability. The double-layer elastic buckle 43 is made of highly elastic and wear-resistant thermoplastic polyurethane (TPU) material, precision injection molded. Its shape perfectly matches the inner contour of the interlocking groove 13. Its elasticity performance has been rigorously tested, maintaining an elasticity retention rate of over 95% within a temperature range of -40℃ to 120℃. During installation, the disassembly bolt 44 is installed using high-precision thread processing equipment to ensure thread accuracy, guaranteeing smooth sliding between the bottom of the disassembly bolt 44 and the top of the L-shaped ring plate 42. An anti-loosening nut design is also used to prevent bolt loosening during equipment operation. The sealing sponge 7 is precisely cut according to the actual gap size using CNC cutting equipment, ensuring that it can fully fill the gap under the interlocking compression of the L-shaped ring plate 41 and L-shaped ring plate 42, enhancing the sealing effect.

[0032] On the side of the encapsulated aluminum plate 2 away from the outer casing 1, the heat dissipation fins 21 and the partition plate 23 are manufactured using an integral molding technology. Through extrusion molding, the heat dissipation fins 21 are ensured to have good heat dissipation performance and structural strength. A dissipation notch 25 is machined within the partition plate 23 using CNC electrical discharge machining to ensure the notch 25 is dimensionally accurate and does not damage the structure of the heat dissipation fins 21. The guide tube 8 is made of oxygen-free copper tubing with excellent thermal conductivity and is bent using high-precision bending equipment to ensure its shape meets design requirements. The guide tube 8 and the nozzle 81 are connected by laser welding, and the welding quality is ensured to be reliable through non-destructive testing. The spray angle and flow rate of the nozzle 81 are optimized through fluid dynamics simulation analysis and multiple actual tests to ensure that the cooling water can uniformly cover the surface of the heat dissipation fins 21. A conical groove 84 is provided at the other end of the guide tube 8. It is machined by CNC turning, and its dimensional accuracy is controlled within ±0.01mm. A water-absorbing sponge 82 is fixed in the conical groove 84. The water-absorbing sponge 82 is made of highly absorbent resin material, and its water absorption ratio is more than 50 times its own weight, and it has good water retention performance.

[0033] The magnetic elastic plate 5 is manufactured using a composite process of high-performance permanent magnets and highly elastic rubber. The permanent magnets are made of neodymium iron boron material, and after magnetization treatment, the surface magnetic induction intensity reaches 1.2T. The elastic rubber is made of silicone rubber with a Shore hardness of A50, and is tightly bonded to the permanent magnet through molding. A conical plug 9 is fixed on the side of the magnetic elastic plate 5 away from the outer shell 1. It is precision-machined using a CNC machining center, and the fitting accuracy between the conical plug 9 and the conical groove 84 is controlled within ±0.01mm to ensure the reliability of sealing and triggering cooling water circulation. The elastic bellows 83 is made of silicone rubber material and manufactured through a blow molding process. Its elasticity and aging resistance have been rigorously tested, ensuring the sealing of cooling water during equipment operation while accommodating the movement of the magnetic elastic plate 5. The bottom of the inner cavity 24 and the sealing sponge 7 are connected to the water-absorbing sponge 82 through the guide fiber bundle 6. The guide fiber bundle 6 is made of highly water-conducting polyester fiber and manufactured through a special weaving process to ensure smooth return of cooling water.

[0034] During assembly, the circuit board 3 is first fixed inside the housing 1 with screws. Anti-loosening screws are used, and a torque wrench is used to tighten them to the specified torque to ensure the circuit board 3 is securely installed and all electronic components are correctly connected. Then, the encapsulation bumps 22 of the aluminum plate 2 are aligned with the encapsulation opening 11 of the housing 1 and fastened. During this fastening process, the magnetic attraction of the magnetic elastic plate 5 causes the encapsulation bumps 22 to fit tightly against the encapsulation opening 11. When the frequency converter coil 31 operates, it generates a changing magnetic field. This magnetic field drives the magnetic elastic plate 5 to undergo reciprocating elastic deformation, intermittently pushing the cone plug 9 into the cone groove 84, squeezing the absorbent sponge 82 to release cooling water. The cooling water is atomized and sprayed from the nozzle 81 through the guide pipe 8, flowing and absorbing heat within the inner cavity 24 of the heat dissipation fins 21, achieving liquid cooling. The atomized cooling water condenses into liquid upon encountering hot air and flows back to the absorbent sponge 82 through the bottom of the inner cavity 24 and the guide fiber bundle 6, completing the cooling water circulation. During the cooling water circulation process, dust on the surface of the heat dissipation fins 21 is washed away, achieving a self-cleaning function.

[0035] When maintenance of the frequency converter is required, use a screwdriver to loosen the disassembly bolt 44. The disassembly bolt 44 pushes the L-shaped ring plate 42 outward, the double-layer elastic buckle 43 resets, and the seal is released. The encapsulated aluminum plate 2 can then be opened to inspect, replace, or clean the circuit board 3, frequency converter coil 31, and other components inside the frequency converter. After maintenance, the encapsulated aluminum plate 2 is re-fastened, and the sealing assembly 4 is tightened by the disassembly bolt 44 to ensure the frequency converter regains its high protection and efficient heat dissipation performance.

[0036] The innovative double-layer elastic buckle 43 of this utility model fits tightly with the buckle groove 13, and together with the compression seal of the sealing sponge 7, it forms a unique multi-level sealing structure, which effectively prevents dust and liquid from entering and provides a reliable guarantee for the stable operation of the frequency converter.

[0037] The design of components such as the heat dissipation fins 21, the guide pipe 8, the nozzle 81, and the magnetic elastic plate 5 allows the variable magnetic field generated by the frequency converter coil 31 during operation to drive the magnetic elastic plate 5 to reciprocate elastically. The linkage of the magnetic elastic plate 5 triggers coolant circulation, and the nozzle 81 atomizes and sprays the coolant, allowing for thorough heat exchange with the air within the inner cavity 24 of the heat dissipation fins 21. This invention achieves a high degree of integration of sealing and heat dissipation functions through the design of components such as the magnetic elastic plate 5 and the elastic bellows 83, resulting in a compact and stable structure.

[0038] The above description is only the best implementation method adopted in this application in combination with current practical needs, but the scope of protection of this application is not limited thereto.

Claims

1. A highly protective sealed frequency converter, comprising a housing (1) and an encapsulation aluminum plate (2) fastened to one side of the housing (1), wherein a circuit board (3) is fixed inside the housing (1), and a frequency converter coil (31) is provided on the circuit board (3), characterized in that, The outer shell (1) has a sealing opening (11) on one side. The sealing opening (11) is provided with a sealing ring (12) and a fastening groove (13). The sealing aluminum plate (2) is provided with a sealing protrusion (22) that matches the sealing opening (11). A sealing component (4) that cooperates with the fastening groove (13) is fixed on the outside of the sealing protrusion (22). The sealing assembly (4) includes an L-shaped ring plate one (41) and an L-shaped ring plate two (42). The L-shaped ring plate one (41) is fixed on the encapsulation protrusion (22). A double-layer elastic buckle (43) is fixed between the bottom of the L-shaped ring plate one (41) and the L-shaped ring plate two (42). The double-layer elastic buckle (43) matches the inner contour of the fastening groove (13). The side of the L-shaped ring plate one (41) is provided with a disassembly bolt (44) through a threaded groove. The bottom end of the disassembly bolt (44) is limited and slidably connected to the top end of the L-shaped ring plate two (42). A sealing sponge (7) is also sandwiched between the L-shaped ring plate one (41) and the L-shaped ring plate two (42).

2. The highly protective sealed frequency converter according to claim 1, characterized in that, The encapsulated aluminum plate (2) has heat dissipation fins (21) on the side away from the outer shell (1). The heat dissipation fins (21) are separated by a partition (23) to form an inner cavity (24). The heat dissipation fins (21) have a liquid dissipation opening (25) in the partition (23). The encapsulated aluminum plate (2) has a guide tube (8) fixed in the liquid dissipation opening (25). One end of the guide tube (8) is connected to a number of nozzles (81) evenly distributed at equal angles. The other end of the guide tube (8) has a conical groove (84). A water-absorbing sponge (82) is fixed in the conical groove (84). A magnetic elastic plate (5) is fixed on the side of the encapsulation bump (22) opposite to the outer shell (1), and a cone plug (9) is fixed on the side of the magnetic elastic plate (5) away from the outer shell (1). The cone plug (9) matches the inner contour of the cone groove (84).

3. A highly protective sealed frequency converter according to claim 2, characterized in that, The bottom of the inner cavity (24) and the sealing sponge (7) are connected to the water-absorbing sponge (82) through the guide fiber bundle (6).

4. A highly protective sealed frequency converter according to claim 2, characterized in that, The magnetic elastic plate (5) has elasticity close to the outer shell (1), and the nozzle (81) is a one-way atomizing nozzle.

5. A highly protective sealed frequency converter according to claim 2, characterized in that, An elastic bellows tube (83) is also fixed to the circumferential side of the port of the conical groove (84), and the end of the elastic bellows tube (83) away from the conical groove (84) is glued to the outer wall of the magnetic elastic plate (5).

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