An anti-interference device for a frequency converter

Abstract

The utility model discloses a kind of frequency converter anti-interference devices, including frequency converter shell, frequency converter body and filter, the inside of frequency converter shell is also provided with shielding layer, shielding layer is equipped with several through holes of shielding layer penetration;The top of frequency converter shell is equipped with cooling fan, the inner wall of frequency converter shell is equipped with several elastic supports of contact with shielding layer;The bottom of frequency converter shell is equipped with air inlet connected with shielding layer, the inside of air inlet is equipped with filter screen, the utility model relates to frequency converter technical field, through the through hole on shielding layer and wire shielding coating, form low impedance heat dissipation path while ensuring electromagnetic shielding effectiveness, effectively reduce the electromagnetic leakage risk of through-hole edge, realize the double optimization of electromagnetic interference suppression and high-efficiency heat dissipation;The multilayer composite structure of shielding layer further cooperates and optimizes electromagnetic shielding topology and heat conduction path, electromagnetic isolation and internal heat are quickly exported, avoid the temperature rise problem caused by traditional closed shielding structure.

Description

Technical Field

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

[0002] As a core power control device in industrial automation, the frequency converter generates strong electromagnetic interference (EMI) due to its high-frequency switching action. This not only affects the normal operation of surrounding sensitive electronic equipment but may also lead to a decrease in its own control accuracy or even malfunction due to external electromagnetic signal interference. To suppress electromagnetic interference, traditional technologies typically use a metal shielding housing to enclose the frequency converter body and a built-in filter to remove interference signals.

[0003] However, when existing inverter anti-interference devices are in use, although the completely sealed metal shielding layer can effectively isolate electromagnetic interference, it will hinder the dissipation of heat inside the inverter. Some improvement solutions enhance ventilation by opening heat dissipation holes on the shielding layer, but the presence of heat dissipation holes will form an electromagnetic leakage path and weaken the shielding effect. Therefore, an inverter anti-interference device is provided. Utility Model Content

[0004] The purpose of this invention is to provide an anti-interference device for frequency converters to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a frequency converter anti-interference device, comprising a frequency converter housing, wherein the frequency converter housing is provided with a frequency converter body and a filter inside, and the frequency converter housing is further provided with a shielding layer covering the outside of the frequency converter body for isolating electromagnetic interference;

[0006] The shielding layer is provided with several openings that penetrate the shielding layer;

[0007] The top of the inverter housing is equipped with a cooling fan, and the inner wall of the inverter housing is equipped with several elastic support members that contact the shielding layer. The elastic support members create a heat dissipation space between the inverter housing and the shielding layer.

[0008] The bottom of the inverter housing is provided with an air inlet connected to the shielding layer, and the inner side of the air inlet is provided with a removable filter screen.

[0009] Preferably, the openings are arranged in a honeycomb array, and the inner wall of each opening is covered with a wire shielding coating.

[0010] Preferably, the shielding layer includes a metal mesh layer and a conductive fiber cloth layer attached to the outer surface of the metal mesh layer, and a thermally conductive insulating layer is further provided between the metal mesh layer and the conductive fiber cloth layer.

[0011] Preferably, it also includes a temperature monitoring module, which includes a temperature sensor disposed in the heat dissipation space and an alarm unit electrically connected to the temperature sensor. The alarm unit is configured to trigger an audible and visual alarm when the detected temperature exceeds a set threshold.

[0012] Preferably, the elastic support is a silicone cylinder, and its end forms an elastic contact support with the outer surface of the shielding layer.

[0013] Compared with existing technologies, the beneficial effects of this utility model are as follows: This utility model provides an anti-interference device for frequency converters. Through the honeycomb array of through-holes distributed on the shielding layer and the inner wall wire shielding coating, it forms a low-impedance heat dissipation path while ensuring electromagnetic shielding effectiveness, effectively reducing the risk of electromagnetic leakage at the edge of the through-holes, and achieving dual optimization of electromagnetic interference suppression and efficient heat dissipation. The multi-layer composite structure of the shielding layer further synergistically optimizes the electromagnetic shielding topology and heat conduction path, taking into account both electromagnetic isolation and rapid internal heat dissipation, avoiding the temperature rise problem caused by traditional closed shielding structures. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the main cross-sectional structure of this utility model;

[0015] Figure 2 for Figure 1 A magnified schematic diagram of the structure at point A;

[0016] Figure 3 This is a partially enlarged structural diagram of the shielding layer of this utility model.

[0017] In the diagram: 1. Inverter housing; 2. Inverter body; 3. Filter; 4. Shielding layer; 41. Port; 42. Wire shielding coating; 43. Metal mesh layer; 44. Conductive fiber cloth layer; 45. Thermally conductive insulation layer; 5. Cooling fan; 6. Elastic support; 7. Air inlet; 8. Filter screen; 9. Temperature monitoring module; 91. Temperature sensor; 92. Alarm unit. Detailed Implementation

[0018] 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.

[0019] Please see Figure 1-3This utility model provides a technical solution: a frequency converter anti-interference device, including a frequency converter housing 1, a frequency converter body 2 and a filter 3 are provided inside the frequency converter housing 1, and a shielding layer 4 covering the outside of the frequency converter body 2 is also provided inside the frequency converter housing 1 for isolating electromagnetic interference.

[0020] The shielding layer 4 is provided with several through-holes 41 that penetrate the shielding layer;

[0021] The top of the inverter housing 1 is provided with a cooling fan 5, and the inner wall of the inverter housing 1 is provided with several elastic support members 6 that are in contact with the shielding layer 4. The elastic support members 6 make the inverter housing 1 and the shielding layer 4 form a heat dissipation space.

[0022] The bottom of the inverter housing 1 is provided with an air inlet 7 connected to the shielding layer 4. The inside of the air inlet 7 is provided with a removable filter screen 8 to block dust from entering the area around the inverter body 2.

[0023] During operation, after the cooling fan 5 is started, external air enters the area around the inverter body 2 through the bottom air inlet 7, is filtered by the filter screen 8, and then enters through the opening 41. The airflow that has absorbed heat enters the heat dissipation space through the opening 41 of the shielding layer 4, and is then discharged by the cooling fan 5, forming forced convection heat dissipation.

[0024] Specifically, the through-holes 41 are distributed in a honeycomb array, and the inner wall of each through-hole 41 is covered with a wire shielding coating 42. The wire shielding coating 42 can be made of silver-based conductive coating, which allows air to flow while suppressing high-frequency electromagnetic leakage. This achieves the formation of a low-impedance heat dissipation path while ensuring electromagnetic shielding effectiveness, effectively reducing the risk of electromagnetic leakage at the edge of the through-hole, and achieving dual optimization of electromagnetic interference suppression and efficient heat dissipation.

[0025] Specifically, the shielding layer 4 includes a metal mesh layer 43 and a conductive fiber cloth layer 44 attached to the outer surface of the metal mesh layer 43. The metal mesh layer 43 can be made of copper mesh, and the conductive fiber cloth layer 44 can be made of silver-plated fiber cloth. A thermally conductive insulating layer 45 is also provided between the metal mesh layer 43 and the conductive fiber cloth layer 44. The thermally conductive insulating layer 45 can be made of ceramic silicone composite material. The metal mesh layer 43 provides high-frequency electromagnetic shielding, the conductive fiber cloth layer 44 enhances low-frequency interference suppression, and the thermally conductive insulating layer 45 conducts internal heat to the heat dissipation space 7 while avoiding interlayer short circuits. Through the multi-layer composite structure of the shielding layer, the electromagnetic shielding topology and heat conduction path are further optimized in a coordinated manner, taking into account both electromagnetic isolation and rapid heat dissipation, realizing the dual functions of electromagnetic shielding and internal heat dissipation, and avoiding the temperature rise problem caused by traditional closed shielding structures.

[0026] Specifically, it also includes a temperature monitoring module 9, which contains a temperature sensor 91 located within the heat dissipation space. The temperature sensor 91 can be a PT100 resistance temperature detector (RTD), and an alarm unit 92 electrically connected to the temperature sensor 91. The alarm unit 92 is located on the outer wall of the inverter housing 1. When the temperature sensor 91 detects that the temperature of the heat dissipation space exceeds a set threshold, the alarm unit 92 triggers an audible and visual alarm to remind the user to check the heat dissipation system. The temperature monitoring module 9 collects temperature data within the heat dissipation space in real time and triggers an audible and visual alarm when the temperature exceeds the threshold, thereby achieving dynamic monitoring and early warning of the equipment's thermal status. This prevents component damage or unexpected shutdowns due to heat dissipation failure, improving system reliability and safety.

[0027] Specifically, the elastic support 6 is a silicone cylinder, and its end forms an elastic contact support with the outer surface of the shielding layer 4. Its contact surface is set as a hemispherical protrusion to increase the contact area and reduce local stress. The elastic support 6 can absorb the fan vibration and prevent the shielding layer 4 from shifting due to resonance.

[0028] Working principle: When this utility model is in operation, the cooling fan 6 is started, and external cold air enters from the bottom air inlet 7. After the dust is intercepted by the detachable filter screen 8, it passes through the opening 41 of the shielding layer 4 and enters the area around the inverter body 2. The airflow absorbs the heat generated by the inverter body 2, and then returns to the heat dissipation space between the shielding layer 4 and the inverter housing 1 through the opening 41. The top cooling fan 6 quickly exhausts the hot air in the heat dissipation space, forming a closed-loop forced convection of "bottom air inlet - internal heat absorption - top air exhaust".

[0029] In the description of this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] All standard parts used in this invention can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0031] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A frequency converter anti-interference device, characterized in that, Includes a frequency converter housing (1), inside which is provided a frequency converter body (2) and a filter (3), and inside the frequency converter housing (1) is also provided a shielding layer (4) covering the outside of the frequency converter body (2) for isolating electromagnetic interference; The shielding layer (4) is provided with several through-holes (41) that penetrate the shielding layer. The inverter housing (1) is provided with a heat dissipation fan (5) at the top, and a number of elastic support members (6) that contact the shielding layer (4) are provided on the inner wall of the inverter housing (1). The elastic support members (6) make a heat dissipation space between the inverter housing (1) and the shielding layer (4). The bottom of the inverter housing (1) is provided with an air inlet (7) connected to the shielding layer (4), and the inner side of the air inlet (7) is provided with a removable filter screen (8).

2. The inverter anti-interference device according to claim 1, characterized in that: The openings (41) are arranged in a honeycomb array, and the inner wall of each opening (41) is covered with a wire shielding coating (42).

3. The inverter anti-interference device according to claim 1, characterized in that: The shielding layer (4) includes a metal mesh layer (43) and a conductive fiber cloth layer (44) attached to the outer surface of the metal mesh layer (43). A thermally conductive insulating layer (45) is also provided between the metal mesh layer (43) and the conductive fiber cloth layer (44).

4. The inverter anti-interference device according to claim 1, characterized in that: It also includes a temperature monitoring module (9), which includes a temperature sensor (91) disposed in the heat dissipation space, and an alarm unit (92) electrically connected to the temperature sensor (91). The alarm unit (92) is configured to trigger an audible and visual alarm when the detected temperature exceeds a set threshold.

5. The inverter anti-interference device according to claim 1, characterized in that: The elastic support (6) is a silicone cylinder, and its end forms an elastic contact support with the outer surface of the shielding layer (4).

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