Frequency converter with anti-interference function

Abstract

A frequency converter with an anti-interference function comprises a base and a frequency converter body, the base is provided with a containing groove, the groove bottom of the containing groove is provided with a plurality of cushion wheels, the cushion wheels have rotational freedom degrees, the frequency converter body is borne on the cushion wheels, and transverse elastic assemblies are arranged between the two sides of the frequency converter body and the groove wall of the containing groove. A longitudinal elastic assembly is arranged between the top of the frequency converter and the groove wall of the containing groove. Through the transverse elastic assembly and the longitudinal elastic assembly, the frequency converter is endowed with the shaking freedom degree in the working process, interference of external vibration is reduced, and the effects of vibration resistance and convenience in installation and maintenance are achieved; and meanwhile, heat dissipation is realized by arranging a heat dissipation fan, the heat dissipation efficiency is improved by arranging a telescopic heat dissipation air channel close to the frequency converter, and enough space for mounting and dismounting the frequency converter is ensured by linkage with a clamping plate.

Description

Technical Field

[0001] This invention relates to the field of variable frequency drive installation protection, and specifically to a variable frequency drive with anti-interference function. Background Technology

[0002] A frequency converter is an electronic device that controls the speed of an AC motor by changing the frequency and voltage of the power supply. Through an AC-DC-AC conversion process, combined with modern control algorithms, it achieves efficient and flexible control of the motor. Its core technology lies in the inverter's PWM modulation and intelligent control strategies, and it is widely used in industrial energy conservation, automation, and precision drive fields.

[0003] During operation, the performance and lifespan of frequency inverters are affected by various environmental factors, such as high temperatures, which can cause electronic components to overheat, leading to performance degradation or damage, and poor heat dissipation, which may trigger overheat protection shutdown. In certain special applications, such as engineering equipment used in mining areas, special attention needs to be paid to: dust accumulation, which can block heat dissipation channels and reduce heat dissipation efficiency; and vibration and mechanical shock, as continuous vibration can cause loose solder joints, broken component leads, and poor connector contact.

[0004] Current frequency converters are all fixed installations. When operating in mining areas, dust, high temperatures, and vibrations significantly reduce their lifespan and increase maintenance frequency. This application proposes a frequency converter with anti-interference capabilities to improve its lifespan and facilitate installation and maintenance. Summary of the Invention

[0005] The purpose of this invention is to provide a frequency converter with anti-interference function to solve the above-mentioned technical problems.

[0006] An anti-interference frequency converter includes a base and a frequency converter. The base is provided with a receiving groove, and the bottom of the receiving groove is provided with multiple pads. The pads have rotational freedom. The frequency converter is supported on the pads. Lateral elastic components are provided between the two sides of the frequency converter and the groove wall of the receiving groove, and longitudinal elastic components are provided between the top of the frequency converter and the groove wall of the receiving groove.

[0007] Furthermore, the lateral elastic component includes a positioning plate and a clamping plate. A first convex shaft is connected to the clamping plate, passing through the positioning plate. A first spring is sleeved on the first convex shaft, with its two ends abutting against the positioning plate and the clamping plate, respectively. Under external vibration conditions, the frequency converter can slide back and forth within the receiving groove. Due to the presence of the lateral elastic component, the kinetic energy of the frequency converter's swaying is absorbed and released by the first spring.

[0008] Furthermore, a motor is connected to the base, and the motor's output shaft is connected to a bidirectional lead screw. The positioning plates are all threaded into the bidirectional lead screw. A second convex shaft is connected to the positioning plate, and the first and second convex shafts are coaxially coupled. The base has a shaft groove, and the second convex shaft engages with the shaft groove. This design allows for adjustment of the positioning plate's position, adjustment of the first spring's preload according to operating conditions, and provision of sufficient installation space when installing the frequency converter.

[0009] Furthermore, the longitudinal elastic component includes a push rod, one end of which passes through the base and is connected to a limit cap, and the other end is connected to a pressure plate. A second spring is sleeved on the push rod, with its two ends contacting the groove wall of the receiving slot and the surface of the pressure plate, respectively. Ball bearings are embedded in the pressure plate. Under the elastic force of the second spring, the pressure plate is pressed tightly against the top surface of the frequency converter, exerting a downward force on the frequency converter.

[0010] Furthermore, the base has semi-wheel grooves on both sides, and a composite plate is connected to both sides of the base. The composite plate also has semi-wheel grooves, and the base and the semi-wheel grooves on the composite plate form a complete wheel groove for accommodating the wheel pad. The composite plate allows for convenient installation and removal of the wheel pad.

[0011] Furthermore, the pressure plate includes a detachable inner ring and an outer ring. The inner ring is connected to a push rod, and its outer edge has an inner ball groove. The outer ring has an outer ball groove, an enlarged groove, and a stop portion on its inner side. The inner ball groove contacts the lower half of the ball, and the outer ball groove contacts the upper half of the ball. The stop portion contacts the inner ring, and the outer ring can rotate relative to the inner ring. A through pin groove is provided on both the inner and outer rings, and a pin is mounted on the pin groove. This design facilitates the installation and removal of the longitudinal elastic component.

[0012] Furthermore, frames are connected to both sides of the inverter on the base, cooling fans are connected to the frames, and telescopic air ducts are also connected to the frames. The telescopic air ducts are connected to the clamping plate via connectors. After the cooling fans are started, they dissipate heat from the inverter. The telescopic air ducts are designed to bring the air inlet closer to the inverter, which can improve the heat dissipation efficiency at the inverter. On the other hand, the telescopic air ducts move with the clamping plate, which is intended to allow sufficient space for the inverter to be installed when the clamping plate is moved back.

[0013] Furthermore, the base is connected to a front frame and a rear frame on both sides. The front frame and rear frame provide anti-detachment protection for the frequency converter.

[0014] Furthermore, the rear frame is equipped with winding posts. After the inverter's wiring side is connected to the inverter, the wiring is wound around the upper winding posts before connecting to external electrical components. This is designed to ensure that the wiring connected to the inverter terminals operates synchronously with the inverter from the terminal to the winding posts, thereby protecting the connection point.

[0015] Beneficial effects: Compared with the prior art, the frequency converter with anti-interference function of the present invention reduces the interference of external vibration by giving the frequency converter a degree of freedom of movement during operation through lateral and longitudinal elastic components, thus achieving the effects of vibration resistance and convenient installation and maintenance; at the same time, heat dissipation is achieved by setting up a cooling fan, and heat dissipation efficiency is improved by setting up a telescopic cooling air duct close to the frequency converter; and sufficient space is ensured for installation and disassembly of the frequency converter through linkage with the clamping plate. The overall device has a simple structure and is suitable for complex working environments with vibration and high temperature. Attached Figure Description

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 : A schematic diagram of the structure of the frequency converter with anti-interference function of the present invention; Figure 2 : A structural diagram showing the front frame after it has been concealed; Figure 3 : Schematic diagram of the lateral elastic component; Figure 4 : Figure 2 A magnified schematic diagram of the structure at point A, i.e., the longitudinal elastic component; Figure 5 : Exploded view of the longitudinal elastic component; In the diagram: Base 1, receiving groove 101, frequency converter 2, washer 3, positioning plate 4, clamping plate 5, first convex shaft 6, first spring 7, motor 8, double-acting lead screw 9, second convex shaft 10, top rod 11, limit cap 12, second spring 13, ball bearing 14, inner ring 15, outer ring 16, inner ball groove 151, outer ball groove 161, enlarged groove 162, abutment part 163, pin groove 17, pin shaft 18, end cap 20, frame 21, cooling fan 22, telescopic air duct 23, connector 24, front frame 25, rear frame 26, winding post 27, composite plate 28. Detailed Implementation

[0017] To make the objectives, features, and advantages of this invention more apparent and understandable, the following description is provided in conjunction with the accompanying drawings. Figures 1-5 Detailed descriptions of specific embodiments of the present invention are provided. Several embodiments of the invention are illustrated in the accompanying drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the invention will be thorough and complete.

[0018] Reference Appendix Figures 1-2An anti-interference frequency converter includes a base 1 and a frequency converter 2. The base 1 is installed at a target position using fasteners such as bolts. The base 1 has a receiving groove 101, and the bottom of the receiving groove 101 is provided with multiple pads 3, each having a degree of rotational freedom. The frequency converter 2 is supported on the pads 3. Lateral elastic components are provided between the two sides of the frequency converter 2 and the groove wall of the receiving groove 101, providing horizontal elastic force to limit and dampen the frequency converter's displacement while preserving its degree of freedom. A longitudinal elastic component is provided between the top of the frequency converter 2 and the groove wall of the receiving groove 101, providing vertical elastic force to limit the frequency converter's displacement while preserving its downward displacement and damping the frequency converter.

[0019] Reference Appendix Figures 2-3 The lateral elastic component includes a positioning plate 4 and a clamping plate 5. The positioning plate 4 can be positioned at a certain position on both sides of the inverter 2. A first convex shaft 6 is connected to the clamping plate 5, and the first convex shaft 6 passes through the positioning plate 4. A first spring 7 is sleeved on the first convex shaft 6, and the two ends of the first spring 7 abut against the positioning plate 4 and the clamping plate 5, respectively. Under external vibration, the inverter can slide back and forth in the receiving groove. Due to the presence of the lateral elastic component, the kinetic energy of the inverter's shaking is absorbed and released by the first spring 7.

[0020] The position of the positioning plate 4 is adjustable, designed to adjust the preload of the first spring 7 according to the working conditions, and to reserve sufficient installation space when installing the frequency converter 2. A motor 8 is connected to the base 1, and the output shaft of the motor 8 is connected to a bidirectional lead screw 9. The positioning plates 4 are threaded into the bidirectional lead screw 9. A second convex shaft 10 is connected to the positioning plate 4, and the first convex shaft 6 and the second convex shaft 10 are coaxially engaged. A shaft groove is provided on the base 1, and the second convex shaft 10 engages with the shaft groove. The motor 8 drives the dual-shaft lead screw 9 to rotate, thereby causing the two positioning plates 4 to move towards or away from each other. The shaft groove guides the movement of the positioning plates. When installing the frequency converter 2, the positioning plates are pre-retracted to reserve sufficient installation space. After the frequency converter is installed, the positioning plates are then controlled to move closer to the frequency converter until the clamping plate 4 adheres to the outer wall of the frequency converter, compressing the first spring 7.

[0021] Reference Appendix Figure 2 , Figure 4 and Figure 5The longitudinal elastic component includes a top rod 11, one end of which passes through the base 1 and is connected to a limit cap 12, and the other end is connected to a pressure plate. A second spring 13 is sleeved on the top rod 11. The two ends of the second spring 13 contact the groove wall of the receiving groove 101 and the surface of the pressure plate, respectively. Ball bearings 14 are embedded in the pressure plate. Under the elastic force of the second spring 13, the pressure plate presses tightly against the top surface of the frequency converter 2, exerting a downward force on the frequency converter and pressing it tightly against the rollers 3 on the bottom surface of the receiving groove. The contact point between the pressure plate and the frequency converter is the ball bearings 14, which is designed to cause rolling friction between the frequency converter and the pressure plate during shaking.

[0022] In this invention, the installation of the frequency converter abandons the traditional fastener installation method. Instead, it utilizes springs to adapt to external vibration interference. Specifically, rollers at the bottom and ball bearings on the top of the frequency converter induce rolling friction during shaking, resulting in low frictional force. Springs in both the lateral and longitudinal directions preserve the frequency converter's freedom of movement and clamp and position it, absorbing vibration energy and offering the advantages of convenient installation and disassembly.

[0023] Reference Appendix Figure 2 The base 1 has half-wheel grooves on both sides, and the base 1 is connected to the two sides of the composite plate 28. The composite plate 28 is also provided with half-wheel grooves. The half-wheel grooves on the base 1 and the composite plate 28 form a complete wheel groove for accommodating the pad wheel 3. Based on the setting of the composite plate 28, the pad wheel 3 can be easily installed and removed.

[0024] refer to Figure 4 and Figure 5 The pressure plate includes a detachable inner ring 15 and an outer ring 16. The inner ring 15 is connected to the push rod 11. The outer edge of the inner ring 15 is provided with an inner ball groove 151. The inner side of the outer ring 16 is provided with an outer ball groove 161, an enlarged groove 162 and abutment part 163. The inner ball groove 151 contacts the lower half of the ball 14, the outer ball groove 161 contacts the upper half of the ball 14, and the abutment part 163 contacts the inner ring 15. The outer ring 16 can rotate relative to the inner ring 15. The inner ring 15 and the outer ring 16 are provided with a through pin groove 17, and a pin 18 is provided on the pin groove 17.

[0025] The function of the enlarged groove 162 is to place the ball 14, unlock the inner ring 15 and the outer ring 16, that is, without inserting the pin 18, rotate the outer ring 16 so that the enlarged groove 162 on it is aligned with the inner ball groove 151. At this time, the ball 14 can be inserted. Then rotate the outer ring 16 until the outer ball groove 161 is aligned with the inner ball groove 151. During the rotation, the inner wall of the outer ring gradually squeezes the ball until the ball is stuck in the inner ball groove 151. At this time, the ball 14 can be inserted. Then rotate the outer ring 16 until it is stuck between the outer ball groove 161 and the inner ball groove 151. At this time, the pin 18 is inserted through the pin groove 17 to complete the fixation. The end cap 20 is connected to the end of the pin 18 for limiting.

[0026] As is common sense, frequency converters require heat dissipation during operation, which is even more critical in outdoor environments such as mining areas. In this embodiment, frames 21 are connected to both sides of the frequency converter 2 on the base 1. Cooling fans 22 are connected to the frames 21, and telescopic air ducts 23 are also connected to the frames 22. The telescopic air ducts 23 are connected to the clamping plate 5 via connectors 24. After the cooling fans are started, they draw air outwards, and the airflow dissipates heat from the frequency converter. The telescopic air ducts 23 are designed to bring the air inlet closer to the frequency converter, thereby improving the heat dissipation efficiency at the frequency converter. Furthermore, the telescopic air ducts 23 move with the clamping plate 5, allowing sufficient space for the frequency converter to be installed when the clamping plate retracts, and allowing it to be close to the frequency converter after installation.

[0027] Reference Appendix Figure 1 and Figure 2 The inverter installation in this invention is a non-fixed installation. By giving the inverter freedom to sway during operation, interference from external vibrations is reduced. In the aforementioned scheme, the inverter is positioned horizontally and vertically by lateral elastic components and longitudinal elastic components, respectively. At the same time, the friction between the clamping plate 5 and the pressing surface of the inverter 2 prevents the inverter 2 from falling off from the installation direction of the receiving slot. To ensure that the inverter 2 cannot fall off from the installation direction of the receiving slot, in this embodiment, a front frame 25 and a rear frame 26 are connected to both sides of the base 1. The front frame 25 and the rear frame 26 provide anti-detachment protection for the inverter and also have an anti-impact protection effect.

[0028] It should be noted that while this invention reduces external vibration interference by giving the inverter a degree of freedom to sway during operation, the risk of wires coming loose at the connection points of the terminals increases as the inverter sways. To address this issue, in this embodiment, the rear frame 26 is equipped with a winding post 27. After the wiring on the inverter 2's wiring side is connected to the inverter, the wiring is wound around the upper winding post 27 before connecting to external electrical components. This ensures that the wiring connected to the inverter's wiring terminal operates synchronously with respect to the inverter 2 from the wiring terminal to the winding post 27, thereby protecting the connection point.

[0029] The frequency converter of this invention, equipped with anti-interference function, reduces external vibration interference by providing the frequency converter with degrees of freedom of movement during operation through lateral and longitudinal elastic components, thus achieving vibration resistance and convenient installation and maintenance. Simultaneously, it achieves heat dissipation through a cooling fan, and improves heat dissipation efficiency by incorporating a telescopic cooling duct close to the frequency converter. Furthermore, its linkage with the clamping plate ensures sufficient space for installation and disassembly of the frequency converter. The overall device has a simple structure and is suitable for complex working environments involving vibration and high temperatures.

[0030] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A frequency converter with anti-interference function, comprising a base (1) and a frequency converter (2), characterized in that: The base (1) is provided with a receiving groove (101), and the bottom of the receiving groove (101) is provided with multiple pads (3). The pads (3) have rotational freedom. The frequency converter (2) is supported on the pads (3). The two sides of the frequency converter (2) are provided with transverse elastic components between the groove wall of the receiving groove (101), and the top of the frequency converter (2) is provided with a longitudinal elastic component between the groove wall of the receiving groove (101).

2. The frequency converter with anti-interference function according to claim 1, characterized in that: The lateral elastic component includes a positioning plate (4) and a clamping plate (5). A first convex shaft (6) is connected to the clamping plate (5). The first convex shaft (6) passes through the positioning plate (4). A first spring (7) is sleeved on the first convex shaft (6). The two ends of the first spring (7) abut against the positioning plate (4) and the clamping plate (5) respectively.

3. The frequency converter with anti-interference function according to claim 2, characterized in that: A motor (8) is connected to the base (1), and a two-way lead screw (9) is connected to the output shaft of the motor (8). The positioning plates (4) are threadedly engaged with the two-way lead screw (9). A second convex shaft (10) is connected to the positioning plate (4). The first convex shaft (6) and the second convex shaft (10) are coaxially engaged. A shaft groove is provided on the base (1), and the second convex shaft (10) is engaged with the shaft groove.

4. The frequency converter with anti-interference function according to claim 1, characterized in that: The longitudinal elastic component includes a top rod (11), one end of which passes through the base (1) and is connected to a limit cap (12), and the other end is connected to a pressure plate. A second spring (13) is provided on the top rod (11), and the two ends of the second spring (13) respectively contact the groove wall of the receiving groove (101) and the surface of the pressure plate. The pressure plate is embedded with balls (14).

5. The frequency converter with anti-interference function according to claim 1, characterized in that: The base (1) has half-wheel grooves on both sides, and the base (1) is connected to the two sides of the composite plate (28). The composite plate (28) has half-wheel grooves, and the half-wheel grooves on the base (1) and the composite plate (28) constitute a complete wheel groove for accommodating the pad wheel (3).

6. The frequency converter with anti-interference function according to claim 4, characterized in that: The pressure plate includes a detachable inner ring (15) and an outer ring (16). The inner ring (15) is connected to the push rod (11). The outer edge of the inner ring (15) is provided with an inner ball groove (151). The inner side of the outer ring (16) is provided with an outer ball groove (161), an enlarged groove (162), and a stop part (163). The inner ball groove (151) contacts the lower half of the ball (14), and the outer ball groove (161) contacts the upper half of the ball (14). The stop part (163) contacts the inner ring (15). The outer ring (16) can rotate relative to the inner ring (15). The inner ring (15) and the outer ring (16) are provided with a through pin groove (17), and a pin shaft (18) is provided on the pin groove (17).

7. The frequency converter with anti-interference function according to claim 6, characterized in that: The base (1) is connected to the two sides of the inverter (2) with a frame (21), a cooling fan (22) is connected to the frame (21), and a telescopic air duct (23) is also connected to the frame (22). The telescopic air duct (23) is connected to the clamp (5) through a connector (24).

8. The frequency converter with anti-interference function according to claim 7, characterized in that: The base (1) is connected to a front frame (25) and a rear frame (26) on both sides.

9. The frequency converter with anti-interference function according to claim 8, characterized in that: The rear frame (26) is provided with a winding post (27). After the wiring of the inverter (2) is connected to the inverter, the wiring is wound around the upper winding post (27) and then connected to the external electrical components.

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