A capacitor fixing device for a frequency converter

Abstract

This utility model discloses a capacitor fixing device for a frequency converter, including a housing and a base. The base is welded to the bottom of the housing, and a capacitor bank is placed on the top of the base. A pressure cap is fixedly mounted on the top of the housing. Track grooves are formed on both sides of the front wall of the housing. A drawer plate is vertically embedded in the pressure cap. Sliding grooves are formed on both sides of the drawer plate, and the track grooves are embedded within the sliding grooves. Clamping feet are welded to both sides of the drawer plate, and corresponding locking grooves are formed on both edges of the pressure cap. The clamping feet are engaged with the locking grooves for fixation. Internal holes are machined on both the drawer plate and the housing wall. Serrated anti-collision blocks are machined on both sides and the rear end of the inner wall of the housing. This utility model, by providing a drawer plate for easy maintenance, exposes the positive terminal wiring area of ​​the capacitor bank without disassembling the capacitor bank itself. This facilitates on-site maintenance and wire inspection when cabinet space is limited, reduces the risk of losing parts, and simplifies assembly.

Description

Technical Field

[0001] This utility model relates to the field of frequency converter technology, specifically to a frequency converter capacitor fixing device. Background Technology

[0002] Frequency converters typically integrate multiple sets of aluminum electrolytic capacitors or film capacitors to filter the bus voltage and store energy. Due to their large capacity and size, the capacitor banks need to be securely fixed inside the frequency converter housing to ensure operation under harsh conditions such as long-term operation, frequent vibration, or high temperature and humidity.

[0003] Currently, there are two main types of common capacitor fixing devices:

[0004] One type involves covering the top of the capacitor bank with a pressure cover. The pressure cover is connected to the inverter housing by multiple screws. When it is necessary to inspect or rewire the positive terminal of the capacitor, all the screws must be loosened and the pressure cover removed before the operation can be carried out. This is cumbersome and the pressure cover is easily damaged or the screws fail due to repeated disassembly and assembly, which increases maintenance costs and safety hazards.

[0005] Another type is designed to improve on-site maintenance efficiency. No clamping or protective structures are installed on the outside of the capacitor bank. It is positioned only by bottom clips or supports, leaving the top wiring area exposed. Although this is convenient for wiring operations, it is easily affected by dust, moisture, arcing, or metal debris during daily operation and lacks an effective protective structure.

[0006] It is evident that current common fixed installations cannot achieve a balance between structural stability and ease of maintenance, which is detrimental to the long-term stable operation of the internal components of the frequency converter.

[0007] Therefore, there is an urgent need for a frequency converter capacitor fixing device to solve the above-mentioned technical defects. Utility Model Content

[0008] The purpose of this utility model is to provide a frequency converter capacitor fixing device to solve the problem mentioned in the background art of being unable to simultaneously achieve protection and ease of maintenance.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a frequency converter capacitor fixing device, comprising a housing and a base, wherein the base is welded to the bottom of the housing, a capacitor bank is placed on the top of the base, a pressure cap is fixedly assembled on the top of the housing, track grooves are provided on both sides of the front wall of the housing, a draw plate is vertically embedded in the pressure cap, a sliding groove is provided on both sides of the draw plate, the track groove is embedded in the sliding groove, a locking foot is welded to both sides of the draw plate, a locking groove is provided on both sides of the pressure cap, the locking foot is fastened to the locking groove, an inner hole is machined on both sides of the draw plate and the housing wall, and anti-collision blocks with a serrated design are machined on both sides and the rear end of the inner wall of the housing.

[0010] As a further technical solution of this utility model, a drying plate is adhered to the inner side of the drawer, and moisture-absorbing particles are distributed inside the drying plate.

[0011] As a further technical solution of this utility model, a connecting piece is provided on the inner wall of the shell near its front side. The connecting piece is an epoxy resin film and is fastened to the outside of the positive electrode of the capacitor bank.

[0012] As a further technical solution of this utility model, a threaded sleeve is welded to the middle of the bottom end of the pressure cap, a screw is screwed into the threaded sleeve, a pressure plate is screwed to the bottom end of the screw, a screw hole is opened in the middle of the pressure plate, and the screw is assembled in the screw hole.

[0013] As a further technical solution of this utility model, the pressure plate has arc-shaped protrusions on both sides, and the pressure plate is adapted to the shape of the capacitor bank.

[0014] As a further technical solution of this utility model, the base consists of two sets of symmetrically arranged plastic support members, which are placed under the front and rear ends of the capacitor bank.

[0015] Compared with the prior art, the beneficial effects of this utility model are: by setting a pull-out plate that is easy to maintain, the positive terminal wiring area can be exposed without disassembling the capacitor bank body, which makes it convenient to complete on-site maintenance and wire inspection when the cabinet space is limited, reduces the risk of losing parts, reduces the cumbersome assembly, and takes into account both capacitor protection and easy maintenance functions.

[0016] By incorporating a drying plate, the capacitor bank continuously absorbs moisture from inside the casing, which helps to enhance the insulation reliability of the capacitor bank and provides excellent protection.

[0017] By incorporating a base and anti-collision blocks, the weight of the capacitor is distributed, preventing component tilting or uneven force on the terminals, thus preventing potential connection problems. The base also absorbs impact forces, effectively reducing the risk of deformation or damage to the capacitor's metal casing caused by instantaneous impact forces. Attached Figure Description

[0018] Figure 1 This is a frontal cross-sectional view of the present invention.

[0019] Figure 2 This is a front view schematic diagram of the drawer panel structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the internal structure of the drawer of this utility model;

[0021] Figure 4 This is a top view cross-sectional structural diagram of the shell of this utility model;

[0022] Figure 5This is a bottom view schematic diagram of the pressure cap structure of this utility model.

[0023] In the diagram: 1. Housing; 2. Slot; 3. Clip foot; 4. Draw plate; 5. Pressure cap; 6. Threaded sleeve; 7. Screw; 8. Screw hole; 9. Pressure plate; 10. Slide groove; 11. Track groove; 12. Connecting piece; 13. Inner hole; 14. Base; 15. Anti-collision block; 401. Drying plate. Detailed Implementation

[0024] 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 only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-5 An embodiment of this utility model provides: a frequency converter capacitor fixing device, including a housing 1 and a base 14. The base 14 is welded to the bottom of the housing 1, and a capacitor group is placed on the top of the base 14. A pressure cover 5 is fixedly assembled on the top of the housing 1. Track grooves 11 are opened on both sides of the front wall of the housing 1. A draw plate 4 is vertically embedded in the pressure cover 5. Slide grooves 10 are opened on both sides of the draw plate 4. The track grooves 11 are embedded in the slide grooves 10. Clamping feet 3 are welded on both sides of the draw plate 4. Clamping grooves 2 are correspondingly provided on both sides of the pressure cover 5. The clamping feet 3 are fastened and fixed to the clamping grooves 2. The draw plate 4 and the wall of the housing 1 are both machined with inner holes 13. A connecting piece 12 is provided on the inner wall of the housing 1 near its front side. The connecting piece 12 is an epoxy resin film and is fastened to the outside of the positive electrode of the capacitor group.

[0026] Specifically, such as Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the pull plate 4 is slidably installed in the track groove 11 by means of the sliding groove 10 on both sides. The front locking foot 3 is fastened to the locking groove 2 on the pressure cover 5 to form a stable lock. During maintenance, the pull plate 4 only needs to be pried upward to make the locking foot 3 disengage from the locking groove 2, and the pull plate 4 can be pulled out from the front end of the housing 1. Therefore, it is not necessary to disassemble the capacitor bank body, and its positive terminal wiring area can be exposed, which is convenient for on-site maintenance and wire inspection when the cabinet space is limited.

[0027] A drying plate 401 is bonded to the inside of the drawer 4, and moisture-absorbing particles are distributed inside the drying plate 401.

[0028] Specifically, such as Figure 1 , Figure 2 and Figure 3As shown, a drying plate 401 is bonded to the inner side of the drawer plate 4. The interior is filled with moisture-absorbing granular material, which can continuously absorb moisture inside the shell 1. This helps to absorb internal moisture, thereby enhancing the insulation reliability of the capacitor bank and providing good protection.

[0029] A threaded sleeve 6 is welded to the middle of the bottom end of the pressure cap 5. A screw rod 7 is screwed into the threaded sleeve 6. A pressure plate 9 is screwed to the bottom end of the screw rod 7. A screw hole 8 is opened in the middle of the pressure plate 9. The screw rod 7 is assembled in the screw hole 8. The two sides of the pressure plate 9 are arc-shaped protrusions. The pressure plate 9 is adapted to the shape of the capacitor group.

[0030] Specifically, such as Figure 1 and Figure 5 As shown, a pressure cap 5 is fixed to the top of the housing 1 by welding. A threaded sleeve 6 is welded to the middle of the pressure cap 5, and a screw 7 is screwed into it. The bottom end of the screw 7 passes through the screw hole 8 in the middle of the pressure plate 9 and finally presses against the top of the capacitor group. When the screw 7 is turned, the pressure plate 9 can be pressed against the upper surface of the capacitor group. The pressure plate 9 has arc-shaped protrusions on both sides, which are compatible with the convex round cap structure on the top of common aluminum electrolytic capacitors, thereby forming a stable support surface, reducing operating vibration, and reducing damage caused by device shaking.

[0031] The base 14 consists of two sets of symmetrically arranged plastic support components, which are placed under the front and rear ends of the capacitor bank.

[0032] Specifically, such as Figure 1 and Figure 4 As shown, the base 14 consists of two symmetrically arranged plastic support components, which are placed below the front and rear ends of the capacitor bank and welded to the bottom of the housing 1. It is made of high-temperature and high-strength modified polypropylene injection molding, which has good flame retardancy. During installation, the bottom of the capacitor bank is naturally placed on the base 14 to form a four-point support structure, which not only distributes the weight of the capacitor body, but also avoids the component tilting or uneven force on the wiring terminals, thus preventing connection hazards.

[0033] The inner walls of the housing 1 are machined with serrated anti-collision blocks 15 on both sides and the rear end;

[0034] Specifically, such as Figure 1 and Figure 4 As shown, serrated anti-collision blocks 15 are machined on both sides and the rear end of the inner wall of the housing 1. The anti-collision blocks 15 are made of flexible high-resilience silicone rubber and have good buffering and energy absorption performance. When the capacitor bank shakes due to transportation bumps or cabinet vibration during operation, the capacitor bank will first contact the raised part of the anti-collision block 15 to absorb the impact force and effectively reduce the risk of deformation or damage to the metal shell of the capacitor caused by the instantaneous impact force. At the same time, the anti-collision block 15 has a certain self-recovery deformation capability and is not easy to be crushed and fail even after long-term contact.

[0035] Working Principle: The capacitor bank is placed at the bottom of the housing 1 and supported by the base 14. The pressure cover 5 is installed at the top of the housing 1 and is manually tightened by a threaded sleeve 6 welded in the middle and a screw 7. The bottom end of the screw 7 passes through the screw hole 8 on the pressure plate 9. During the tightening process, the pressure plate 9 moves down and presses the top of the capacitor bank together, forming a longitudinal compression. The pressure cover 5 has slots 2 on both sides, and the pull plate 4 has feet 3 and sliding grooves 10 on both sides. The sliding grooves 10 cooperate with the track grooves 11 on the housing 1 to form a pull-out guide rail. The feet 3 automatically engage with the slots 2 and are pressed together to complete the sealing. When maintenance is required, simply pry the pull plate 4 upwards, and the feet 3 will disengage from the slots 2, allowing the pull plate 4 to move away from the track grooves 11 along the sliding grooves 10 and be pulled out as a whole. At this time, the positive terminal of the capacitor inside the housing 1 is exposed, allowing for direct wiring maintenance or testing without disassembling the entire capacitor body. Especially suitable for on-site maintenance in situations where cabinet space is limited. At the same time, a drying plate 401 is bonded to the inside of the drawer 4. The drying plate 401 is filled with moisture-absorbing particles, which can continuously absorb moisture inside the housing 1 during the operation of the device, enhancing the insulation stability of the capacitor bank. To prevent the capacitor from shifting or being impacted during operation or transportation, anti-collision blocks 15 with a serrated design are processed on both sides and the rear end of the inner wall of the housing 1. The anti-collision blocks 15 are made of high-resilience silicone rubber, which can provide flexible buffer when the capacitor shakes, avoiding deformation of the housing 1 or damage to the solder feet caused by mechanical impact. They have self-recovery ability and can maintain protective performance for a long time. A connecting piece 12 is provided on the inner wall of the front side of the housing 1. The connecting piece 12 is made of epoxy resin film material and is fastened to the outer area of ​​the positive electrode of the capacitor bank, which plays the role of electrical insulation, short circuit prevention and electromagnetic interference shielding.

[0036] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A capacitor fixing device for a frequency converter, comprising a housing (1) and a base (14), characterized in that: A base (14) is welded to the bottom of the inner shell (1). A capacitor bank is placed on the top of the base (14). A pressure cap (5) is fixedly installed on the top of the shell (1). Track grooves (11) are provided on both sides of the inner front wall of the shell (1). A draw plate (4) is vertically embedded in the pressure cap (5). A sliding groove (10) is provided on both sides of the draw plate (4). The track groove (11) is embedded in the sliding groove (10). A locking foot (3) is welded to both sides of the draw plate (4). A locking groove (2) is provided on both sides of the pressure cap (5). The locking foot (3) is fastened to the locking groove (2). An inner hole (13) is processed on the wall surface of the draw plate (4) and the shell (1). A serrated anti-collision block (15) is processed on both sides and the rear end of the inner wall of the shell (1).

2. The inverter capacitor fixing device according to claim 1, characterized in that: A drying plate (401) is bonded to the inside of the drawer (4), and moisture-absorbing particles are distributed inside the drying plate (401).

3. The inverter capacitor fixing device according to claim 1, characterized in that: The housing (1) has a connecting piece (12) near its front inner wall. The connecting piece (12) is an epoxy resin film and is fastened to the outside of the positive electrode of the capacitor bank.

4. The inverter capacitor fixing device according to claim 1, characterized in that: The pressure cap (5) has a threaded sleeve (6) welded to the middle of its bottom end. A screw rod (7) is screwed into the threaded sleeve (6). A pressure plate (9) is screwed to the bottom end of the screw rod (7). A screw hole (8) is opened in the middle of the pressure plate (9). The screw rod (7) is assembled in the screw hole (8).

5. The inverter capacitor fixing device according to claim 4, characterized in that: The pressure plate (9) has arc-shaped protrusions on both sides, and the pressure plate (9) is adapted to the shape of the capacitor bank.

6. The inverter capacitor fixing device according to claim 1, characterized in that: The base (14) consists of two sets of symmetrically arranged plastic support components, which are placed under the front and rear ends of the capacitor bank.

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