SFC frequency conversion starting device
By introducing a water vapor adsorption filter and an automatic cleaning module into the frequency converter cabinet, the problems of low heat dissipation efficiency and dust blockage in traditional frequency converter cabinets are solved, achieving efficient heat dissipation and self-cleaning, and improving the operational stability and maintenance convenience of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SHANGHAI YICONG ELECTRIC CO LTD
- Filing Date
- 2025-06-29
- Publication Date
- 2026-06-23
AI Technical Summary
Traditional frequency converter cabinets have low heat dissipation efficiency, are prone to equipment failure due to condensation and dust blockage, and lack self-cleaning function, affecting equipment safety and ease of maintenance.
An SFC variable frequency starter device was designed, which uses a water vapor adsorption filter to filter moisture and dust, constructs an efficient air convection heat dissipation system, and is equipped with an automatic cleaning module. The module removes dust from the filter plate surface by scraping and brushing, and adjusts the position of the comb clamp to manage the wires, so as to achieve dry and clean operation of the internal components.
It improves the heat dissipation efficiency of frequency converter components, avoids condensation and dust blockage, ensures the safe and stable operation of equipment, and enhances the convenience of maintenance and the reliability of equipment.
Smart Images
Figure CN224401399U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to frequency converter starting devices, and in particular to an SFC frequency converter starting device, belonging to the field of frequency converter starting technology. Background Technology
[0002] SFC is an abbreviation for Static Frequency Converter, also known as a static variable frequency starter. SFC uses power electronic devices such as thyristors to convert a fixed-frequency power supply into a variable-frequency power supply, providing variable frequency power to the motor and thus achieving soft starting and speed regulation. During the starting process, it gradually increases the output frequency, allowing the motor speed to rise smoothly and avoiding the large starting current and mechanical shock found in traditional starting methods.
[0003] It has the following advantages: 1. Reduced starting current: It can limit the starting current to a lower level, reducing the impact on the power grid and also reducing the wear of motor windings and mechanical parts. 2. Smooth speed regulation: It can achieve stepless speed regulation of the motor within a wide range to meet the speed requirements under different operating conditions. 3. Improved power factor: Through reasonable control strategies, the power factor of the device can be made higher, reducing reactive power consumption.
[0004] Variable frequency drive (VFD) components are typically installed in VFD cabinets. However, traditional VFD cabinets often rely on natural convection or simple fan installations for heat dissipation. Due to the lack of internal heat dissipation design, the airflow inside the cabinet is turbulent, making it difficult to form an efficient heat conduction path, resulting in low heat dissipation efficiency for the VFD components. Even when forced convection is achieved using fans, improper airflow planning often fails to adequately cover the heat-generating components, making it difficult to meet the heat dissipation requirements of high-power VFD equipment.
[0005] Furthermore, in environments with large temperature differences between day and night or high humidity, traditional frequency converter cabinets lack effective air filtration devices. When humid outside air enters the cabinet directly, condensation easily forms inside due to the temperature difference. If these condensed water droplets come into contact with the frequency converter components, they can cause short circuits, corrosion, and other malfunctions, seriously threatening equipment safety. At the same time, ordinary frequency converter cabinets lack self-cleaning functions. With increased use, the air inlet filter is easily clogged with dust and debris, further weakening ventilation and increasing the risk of equipment overheating.
[0006] Therefore, an SFC variable frequency starter is proposed. Utility Model Content
[0007] In view of this, the present invention provides an SFC variable frequency starter device to solve or alleviate the technical problems existing in the prior art, and at least provides a beneficial option.
[0008] The technical solution of this utility model is implemented as follows: An SFC variable frequency starter includes a variable frequency cabinet, an installation plate installed inside the variable frequency cabinet, a frame plate installed inside the variable frequency cabinet, a water vapor adsorption filter element installed inside the frame plate, a connecting plate installed on the water vapor adsorption filter element, a limiting piece rotatably installed on the frame plate, a partition plate installed inside the variable frequency cabinet, ventilation slots provided inside both the partition plate and the frame plate, an air exchange chamber installed on the back of the variable frequency cabinet, a motor installed on the frame plate, a threaded rod installed at the output end of the motor, a movable plate slidably installed inside the frame plate, a cleaning plate slidably installed inside the movable plate, a spring installed inside the movable plate, a scraper and brush bristles installed on the cleaning plate, a dust discharge trough installed inside the variable frequency cabinet, a guide rail installed on the back of the variable frequency cabinet, a sliding plate slidably installed on the guide rail, and a baffle installed below the sliding plate.
[0009] More preferably, the movable plate is provided with a threaded groove, and the movable plate and the threaded rod are connected by a thread.
[0010] More preferably, one end of the spring is installed inside the movable plate, and the other end of the spring is installed on the back of the cleaning plate, and the spring drives the cleaning plate to tend to approach the water vapor adsorption filter.
[0011] More preferably, the inner wall of the frame plate is provided with a vertical sliding groove, and the two sides of the movable plate are provided with protrusion structures adapted to the sliding groove, the protrusion structures being slidably disposed in the sliding groove.
[0012] More preferably, the scraper is made of silicone, and the frame plate is located on the right side of the mounting plate.
[0013] More preferably, a grooved plate is installed on the mounting plate, a T-shaped block is slidably installed in the grooved plate, a rotating seat is provided on the T-shaped block, a threaded sleeve is rotatably installed on the T-shaped block through the rotating seat, a stud is threadedly connected to the threaded sleeve, a top pressure plate is installed at one end of the stud, and a comb clamp is installed at the other end of the stud.
[0014] More preferably, the top pressure plate is located on the back of the T-shaped block, and the back of the top pressure plate is provided with anti-slip ripples.
[0015] The present invention has the following advantages due to the adoption of the above technical solution:
[0016] I. In this utility model, an efficient air convection heat dissipation system is constructed through optimized internal space layout, effectively improving the heat dissipation efficiency of the frequency converter components. Simultaneously, a water vapor adsorption filter element is installed at the air inlet, which can accurately intercept and adsorb water vapor and dust in the air, thereby effectively preventing condensation caused by temperature differences between the inside and outside of the frequency converter cabinet, creating a dry and clean operating environment for the internal frequency converter components. Furthermore, the device has an automatic cleaning module that, through automatic reciprocating motion, periodically cleans the air inlet surface of the water vapor adsorption filter plate, promptly removing dust and impurities adhering to the surface, ensuring unobstructed ventilation channels, and avoiding the problem of reduced air exchange efficiency caused by filter plate blockage.
[0017] II. In this utility model, by setting up a slotted plate, a T-block, a rotating seat, a stud, a top pressure plate, a comb clamp, and a threaded sleeve, the position and angle of the comb clamp can be quickly adjusted according to the actual placement of the frequency converter components through simple sliding of the T-block and tightening of the threaded sleeve. This adjustable design achieves precise positioning and orderly storage of complex circuits, greatly improving the efficiency and standardization of internal frequency converter component wiring, effectively avoiding problems such as tangled and messy wiring, and enhancing maintenance convenience.
[0018] The above overview is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features of the present invention will become readily apparent from the accompanying drawings and the following detailed description. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0021] Figure 2 This is a schematic diagram of the rear structure of this utility model;
[0022] Figure 3 This is an exploded structural diagram of the top pressure plate of this utility model;
[0023] Figure 4 In this utility model Figure 3 Partial structural diagram;
[0024] Figure 5 This is an exploded view of the water vapor adsorption filter element of this utility model;
[0025] Figure 6 This is a cross-sectional structural diagram of the present invention;
[0026] Figure 7 In this utility model Figure 6 Partial structural diagram.
[0027] Attached reference numerals: 1. Variable frequency cabinet; 2. Mounting plate; 3. Frame plate; 4. Water vapor adsorption filter element; 5. Connecting plate; 6. Limiting plate; 7. Partition plate; 8. Ventilation slot; 9. Air exchange chamber; 10. Motor; 11. Threaded rod; 12. Moving plate; 13. Cleaning plate; 14. Spring; 15. Scraper; 16. Brush bristles; 17. Ash discharge chute; 18. Guide rail; 19. Slide plate; 20. Baffle; 21. Slot plate; 22. T-block; 23. Rotating seat; 24. Stud; 25. Top pressure plate; 26. Comb clamp; 27. Threaded sleeve. Detailed Implementation
[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0030] like Figure 1-7As shown, this utility model embodiment provides an SFC variable frequency starter device, including a frequency converter cabinet 1, an installation plate 2 installed inside the frequency converter cabinet 1, a frame plate 3 installed inside the frequency converter cabinet 1, a water vapor adsorption filter element 4 installed inside the frame plate 3, a connecting plate 5 installed on the water vapor adsorption filter element 4, a limit plate 6 rotatably installed on the frame plate 3, a partition plate 7 installed inside the frequency converter cabinet 1, ventilation slots 8 installed in both the partition plate 7 and the frame plate 3, an air exchange chamber 9 installed on the back of the frequency converter cabinet 1, a motor 10 installed on the frame plate 3, a threaded rod 11 installed at the output end of the motor 10, a movable plate 12 slidably installed inside the frame plate 3, a cleaning plate 13 slidably installed inside the movable plate 12, a spring 14 installed inside the movable plate 12, a scraper 15 and bristles 16 installed on the cleaning plate 13, a dust discharge trough 17 installed inside the frequency converter cabinet 1, a guide rail 18 installed on the back of the frequency converter cabinet 1, a sliding plate 19 slidably installed on the guide rail 18, and a baffle 20 installed below the sliding plate 19. (Variable frequency drive (SFC) starters have numerous applications: 1. Power industry: used for starting large generators and for speed regulation and energy-saving operation of various motors in plant power systems. 2. Metallurgical industry: used for starting and speed regulation of large equipment such as blast furnace blowers and rolling mills. 3. Petrochemical industry: applied to equipment such as oil pipeline pumps and compressors to achieve energy saving and precise control. SFC plays an important role in the industrial field, effectively improving the operating efficiency and reliability of motors, and reducing energy consumption and equipment maintenance costs.)
[0031] In one embodiment, the movable plate 12 is provided with a threaded groove, and the movable plate 12 is connected to the threaded rod 11 by a thread. When the motor 10 is started and the threaded rod 11 is rotated, the movable plate 12 and the protrusion structure will slide along the groove under the action of the thread.
[0032] In one embodiment, one end of the spring 14 is installed inside the movable plate 12, and the other end of the spring 14 is installed on the back of the cleaning plate 13. The spring 14 drives the cleaning plate 13 to tend to approach the water vapor adsorption filter element 4. Under the preload of the spring 14, it is ensured that the scraper 15 and the bristles 16 are in contact with the water vapor adsorption filter element 4, thereby improving the cleaning effect.
[0033] In one embodiment, a vertically oriented sliding groove is provided on the inner wall of the frame plate 3, and protrusion structures adapted to the sliding groove are provided on both sides of the movable plate 12. The protrusion structures are slidably disposed within the sliding groove. Under the action of the thread, the movable plate 12 and the protrusion structures will slide along the sliding groove from top to bottom, which improves the stability during the sliding process and plays a guiding role.
[0034] In one embodiment, the scraper 15 is made of silicone, and the frame plate 3 is located on the right side of the mounting plate 2. Through optimized internal space layout, a highly efficient air convection heat dissipation system is constructed, effectively improving the heat dissipation performance of the frequency converter components.
[0035] In one embodiment, a grooved plate 21 is mounted on the mounting plate 2, and a T-block 22 is slidably mounted within the grooved plate 21. A rotating seat 23 is provided on the T-block 22, and a threaded sleeve 27 is rotatably mounted on the T-block 22 via the rotating seat 23. A stud 24 is threadedly connected to the threaded sleeve 27, a pressure plate 25 is mounted on one end of the stud 24, and a comb clamp 26 is mounted on the other end of the stud 24. The position and angle of the comb clamp 26 can be quickly adjusted according to the actual placement of the frequency converter components through simple sliding of the T-block 22 and tightening of the threaded sleeve 27.
[0036] In one embodiment, the top pressure plate 25 is located on the back of the T-block 22, and the back of the top pressure plate 25 is provided with anti-slip ripples. Rotating the threaded sleeve 27, and under the action of the thread, the stud 24 and the top pressure plate 25 are moved inward, while the top pressure plate 25 applies pressure to the inner wall of the groove plate 21 and completes the limiting and fixing.
[0037] When this utility model is in operation: First, the ventilation chamber 9 is started and the internal fan blades are rotated, thereby drawing external airflow into the frame plate 3. At this time, the water vapor adsorption filter element 4 can accurately intercept and adsorb water vapor and dust in the air, thus effectively preventing condensation caused by the temperature difference between the inside and outside of the inverter cabinet 1. The filtered air will be blown through the ventilation slot 8 to the arranged inverter elements, fully covering the heat-generating elements, improving heat dissipation efficiency, and creating a dry and clean operating environment for the internal inverter elements. When it is necessary to clean the dust and impurities on the surface of the water vapor adsorption filter element 4, the motor 10 is started and the threaded rod 11 is rotated. At this time, under the action of the thread, the moving plate 12 and the protrusion structure will slide from top to bottom along the slide groove. At this time, under the pre-tightening force of the spring 14, it can be ensured that the scraper 15 and the bristles 16 are simultaneously scraped against the water vapor adsorption filter element 4, thereby achieving a cleaning effect. Dust and impurities will fall into the ash discharge trough 17 under gravity. At this time, the slide plate 19 and baffle 20 are pulled along the guide rail 18 to expose the ash discharge trough 17 for cleaning. When adjusting the position of the comb clamp 26 according to the placement of the internal frequency conversion components, first rotate the threaded sleeve 27 and drive the stud 24 and top pressure plate 25 to move outward under the action of the thread, so that the top pressure plate 25 no longer applies top pressure to the inner wall of the trough plate 21, thereby releasing the limit of the T-block 22. At this time, the T-block 22 can be slid along the trough plate 21 and the position can be adjusted. After the adjustment is completed, rotate the threaded sleeve 27 in the opposite direction and drive the stud 24 and top pressure plate 25 to move inward under the action of the thread. At the same time, the top pressure plate 25 applies pressure to the inner wall of the trough plate 21 again and completes the limit fixation. By rotating the limit plate 6, the limit of the connecting plate 5 and the water vapor adsorption filter element 4 can be released and replaced.
[0038] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in this utility model, and these should all be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.
Claims
1. An SFC variable frequency starter, characterized in that: The system includes a frequency converter cabinet (1), an installation plate (2) installed inside the frequency converter cabinet (1), a frame plate (3) installed inside the frequency converter cabinet (1), a water vapor adsorption filter element (4) installed inside the frame plate (3), a connecting plate (5) installed on the water vapor adsorption filter element (4), a limiting piece (6) rotatably installed on the frame plate (3), a partition plate (7) installed inside the frequency converter cabinet (1), ventilation slots (8) installed in both the partition plate (7) and the frame plate (3), a ventilation chamber (9) installed on the back of the frequency converter cabinet (1), and a motor (10) installed on the frame plate (3). A threaded rod (11) is installed at the output end of the motor (10). A movable plate (12) is slidably installed inside the frame plate (3). A cleaning plate (13) is slidably installed inside the movable plate (12). A spring (14) is provided inside the movable plate (12). A scraper (15) and brush bristles (16) are installed on the cleaning plate (13). A dust discharge trough (17) is provided inside the frequency converter cabinet (1). A guide rail (18) is installed on the back of the frequency converter cabinet (1). A sliding plate (19) is slidably installed on the guide rail (18). A baffle (20) is installed below the sliding plate (19).
2. The SFC variable frequency starter according to claim 1, characterized in that: The movable plate (12) is provided with a threaded groove, and the movable plate (12) and the threaded rod (11) are connected by a thread.
3. The SFC variable frequency starter according to claim 1, characterized in that: One end of the spring (14) is installed inside the movable plate (12), and the other end of the spring (14) is installed on the back of the cleaning plate (13). The spring (14) drives the cleaning plate (13) to tend to approach the water vapor adsorption filter (4).
4. The SFC variable frequency starter according to claim 1, characterized in that: The inner wall of the frame plate (3) is provided with a vertical sliding groove, and the two sides of the movable plate (12) are provided with a protrusion structure that matches the sliding groove. The protrusion structure is slidably disposed in the sliding groove.
5. The SFC variable frequency starter according to claim 1, characterized in that: The scraper (15) is made of silicone, and the frame plate (3) is located on the right side of the mounting plate (2).
6. The SFC variable frequency starter according to claim 1, characterized in that: A groove plate (21) is installed on the mounting plate (2). A T-shaped block (22) is slidably installed in the groove plate (21). A rotating seat (23) is provided on the T-shaped block (22). A threaded sleeve (27) is rotatably installed on the T-shaped block (22) through the rotating seat (23). A stud (24) is threadedly connected inside the threaded sleeve (27). A top pressure plate (25) is installed at one end of the stud (24), and a comb clamp (26) is installed at the other end of the stud (24).
7. The SFC variable frequency starter according to claim 6, characterized in that: The top pressure plate (25) is located on the back of the T-block (22), and the back of the top pressure plate (25) is provided with anti-slip ripples.