Anti-interference shell of active filter

Abstract

The utility model discloses an anti-interference shell of an active filter, which comprises a cabinet body, a cabinet door is rotatably arranged at an outlet of the front surface of the cabinet body, metal plates are arranged on the inner wall of the cabinet body and the back surface of the cabinet door, a metal frame is arranged at the edge of the outlet of the front surface of the cabinet body, and the outer side edge of the metal frame is welded on the metal plate of the inner wall of the cabinet body. Air inlets are formed in corresponding positions of the bottoms of the left and right side walls of the cabinet body and the metal plates on the left and right side walls, air outlets are formed in corresponding positions of the top and the top metal plate of the cabinet body, ventilation plates and filter screens are mounted at the air inlets and the air outlets, and an exhaust fan is mounted at the top air outlet of the cabinet body; according to the shell, the metal plates are arranged on the inner wall of the cabinet body and the back face of the cabinet door, the metal frame is arranged on the edge of an outlet in the front face of the cabinet body, when the cabinet door is closed, the metal plates on the back face of the cabinet door can make contact with the metal frame, the inner wall of the cabinet body and the metal plates on the back face of the cabinet door integrally form a relatively-closed metal box, and therefore external electromagnetic interference is shielded.

Description

Technical Field

[0001] The utility model relates to the technical field of filters, in particular to an anti-interference housing for an active filter. Background Technique

[0002] An active filter is a new type of power electronic device used for dynamically suppressing harmonics and compensating reactive power. It can compensate for harmonics and reactive power that change in both magnitude and frequency. Existing active filters are usually used together with other electrical equipment. Therefore, high-frequency electromagnetic waves emitted by other electrical equipment during use will generate radio frequency interference to the active filter. If the interference is not suppressed in time, it will affect the normal operation of the equipment. Moreover, the housings of existing active filters mostly use air circulation for heat dissipation, and dust in the external air is likely to interfere with the operation of the active filter, affecting the heat dissipation of the active filter and reducing the working efficiency of the active filter.

[0003] Therefore, we design an anti-interference housing for an active filter here. Content of the Utility Model

[0004] The purpose of the utility model is to provide an anti-interference housing for an active filter aiming at the deficiencies of the prior art, so as to solve the problems raised in the background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: an anti-interference housing for an active filter, including a cabinet body. A cabinet door is rotatably installed at the front outlet of the cabinet body. Metal plates are installed on the inner wall of the cabinet body and the back of the cabinet door. A metal frame is arranged at the edge of the front outlet of the cabinet body, and the outer edge of the metal frame is welded to the metal plate on the inner wall of the cabinet body. Air inlets are arranged at the bottom of the left and right side walls of the cabinet body and at the corresponding positions of the metal plates on the left and right side walls. Air outlets are arranged at the top of the cabinet body and at the corresponding positions of the top metal plate. Ventilation plates and filters are installed at the air inlets and air outlets. An exhaust fan is installed at the air outlet at the top of the cabinet body. Three pairs of vertically distributed strip-shaped support plates are installed between the left and right inner side walls of the cabinet body. Two symmetrical auxiliary heat dissipation structures are installed between each pair of strip-shaped support plates. An active filter is installed at the top of each pair of strip-shaped support plates.

[0006] Preferably, the auxiliary heat dissipation structure includes a first strip plate and a second strip plate. Both the first strip plate and the second strip plate are fixedly installed between the strip-shaped support plates. A pair of sliding rods are installed between the two strip plates. A slider is slidably installed on the sliding rods. A vertical heat conduction plate is installed on the top of the slider. A plurality of heat dissipation fins are installed on one side of the heat conduction plate close to the second strip plate. A screw rod is rotatably installed between the first strip plate and the second strip plate. A threaded through hole is provided on the slider, and the threaded through hole is matched with the screw rod. A rotating shaft is rotatably installed on the side of the second strip plate away from the first strip plate through a bearing seat. A pair of meshing bevel gears are installed between the rear end of the rotating shaft and the rotating shaft of the screw rod. The front end of the rotating shaft passes through the strip-shaped support plate and a knob is installed.

[0007] Preferably, the metal plate is made of aluminum plate.

[0008] Preferably, the ventilation plate is an aluminum honeycomb ventilation plate.

[0009] Preferably, the metal frame is an aluminum rectangular frame.

[0010] Preferably, a conductive coating is applied to the joint between the ventilation plate and the metal plate at the air inlet and outlet.

[0011] Preferably, the heat conduction plates of the two auxiliary heat dissipation structures between each pair of strip-shaped support plates are arranged oppositely.

[0012] Compared with the prior art, the present utility model provides an anti-interference housing for an active filter, having the following beneficial effects:

[0013] For the anti-interference housing of the active filter, by arranging metal plates on the inner wall of the cabinet body and the back surface of the cabinet door, and arranging a metal frame at the front outlet edge of the cabinet body, when the cabinet door is closed, the metal plate on the back surface of the cabinet door can be in contact with the metal frame, so that the metal plates on the inner wall of the cabinet body and the back surface of the cabinet door form a relatively enclosed metal box as a whole, thereby shielding external electromagnetic interference. By arranging a filter screen at the air inlet and outlet of the cabinet body, dust can be prevented from entering the cabinet body and affecting the heat dissipation of the active filter. At the same time, an auxiliary heat dissipation structure is also arranged in the cabinet body to help the active filter dissipate heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the overall structure of the present utility model;

[0015] Figure 2 is a side sectional view of the cabinet body of the present utility model;

[0016] Figure 3 is a schematic diagram of the auxiliary heat dissipation structure of the present utility model.

[0017] Reference numerals: 1, cabinet body; 2, cabinet door; 3, metal plate; 4, ventilation plate; 5, filter screen; 6, exhaust fan; 7, strip-shaped support plate; 8, auxiliary heat dissipation structure; 8-1, first strip-shaped plate; 8-2, second strip-shaped plate; 8-3, slide bar; 8-4, slider; 8-5, heat conduction plate; 8-6, heat sink; 8-7, screw rod; 8-8, rotating shaft; 8-9, bevel gear; 8-10, knob; 9, metal frame; 10, active filter. Detailed implementation manners

[0018] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figures 1-3 , in this implementation manner: An anti-interference housing for an active filter, including a cabinet body 1, please refer to Figure 1 and Figure 2, a cabinet door 2 is rotatably installed at the front exit of the cabinet body 1. Metal plates 3 are installed on the inner wall of the cabinet body 1 and the back of the cabinet door 2. The metal plates 3 are made of aluminum plates. The function of the metal plates 3 is to shield electromagnetic interference. A metal frame 9 is provided at the edge of the front exit of the cabinet body 1. The metal frame 9 is an aluminum rectangular frame. The outer edge of the metal frame 9 is welded to the metal plate 3 on the inner wall of the cabinet body 1. When the cabinet door 2 is closed, the metal plate 3 on the back of the cabinet door 2 can just contact the metal frame 9, so that the metal plate 3 in the cabinet body 1 and the metal plate 3 on the back of the cabinet door 2 are connected to form a relatively closed metal box. The active filter 10 placed in the metal box can shield external electromagnetic interference. Air inlets are provided at the bottoms of the left and right side walls of the cabinet body 1 and at the corresponding positions of the metal plates on the left and right side walls. Air outlets are provided at the top of the cabinet body 1 and at the corresponding positions of the top metal plate. Ventilation plates 4 and filter screens 5 are installed at the air inlets and air outlets. The function of the filter screen 5 is to prevent dust from entering the cabinet body 1 and interfering with the operation of the active filter 10. The ventilation plates 4 are aluminum honeycomb ventilation plates. Conductive paint is applied to the joints between the ventilation plates 4 and the metal plates 3 at the air inlets and outlets, so as to reduce the electrical discontinuity of the formed metal box structure. Using aluminum honeycomb ventilation plates can minimize electromagnetic leakage while ensuring ventilation inside the cabinet body 1. An exhaust fan 6 is installed at the air outlet at the top of the cabinet body 1. The exhaust fan 6 can discharge the air inside the cabinet body 1 through the air outlet. At the same time, external air can enter the cabinet body 1 through the air inlet, so as to form an air duct inside the cabinet to take away the heat generated when the active filter 10 works. Three pairs of vertically distributed strip-shaped support plates 7 are installed between the left and right inner side walls of the cabinet body 1. Two symmetrical auxiliary heat dissipation structures 8 are installed between each pair of strip-shaped support plates 7. The active filter 10 is installed at the top of each pair of strip-shaped support plates 7.

[0020] Please refer to Figure 3, the auxiliary heat dissipation structure 8 includes a first strip plate 8-1 and a second strip plate 8-2. Both the first strip plate 8-1 and the second strip plate 8-2 are fixedly installed between the strip support plates 7. A pair of slide rods 8-3 are installed between the two strip plates. A slider 8-4 is slidably installed on the slide rods 8-3. A vertical heat conduction plate 8-5 is installed on the top of the slider 8-4. A plurality of heat dissipation fins 8-6 are installed on one side of the heat conduction plate 8-5 close to the second strip plate 8-2. When the heat conduction plate 8-5 is in contact with the active filter 10, the heat generated when the active filter 10 works can be conducted to the heat dissipation fins 8-6 through the heat conduction plate 8-5, thereby increasing the heat dissipation area of the active filter 10 and helping the active filter 10 to dissipate heat. A screw rod 8-7 is rotatably installed between the first strip plate 8-1 and the second strip plate 8-2. A threaded through hole is provided on the slider 8-4, and the threaded through hole is matched with the screw rod 8-7. A rotating shaft 8-8 is rotatably installed on the side of the second strip plate 8-2 away from the first strip plate 8-1 through a bearing seat. A pair of meshing bevel gears 8-9 are installed between the rear end of the rotating shaft 8-8 and the rotating shaft of the screw rod 8-7. The front end of the rotating shaft 8-8 passes through the strip support plate 7 and a knob 8-10 is installed. Rotating the knob 8-10 can drive the rotating shaft 8-8 to rotate, and then the screw rod 8-7 can be driven to rotate through bevel gear transmission. By matching the screw rod 8-7 with the threaded through hole on the slider 8-4, the movement of the slider 8-4 driving the heat conduction plate 8-5 can be controlled, so that the heat conduction plate 8-5 can contact the active filter 10 installed on the strip support plate 7. The heat conduction plates 8-5 of the two auxiliary heat dissipation structures 8 between each pair of strip support plates 7 are arranged oppositely. When installing the active filter 10, the two heat conduction plates 8-5 should be on both sides of the active filter 10. After the active filter 10 is installed, control the two heat conduction plates 8-5 to contact the active filter 10.

[0021] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An anti-interference housing of an active filter, comprising a cabinet (1), characterized in that: A cabinet door (2) is rotatably mounted at the front outlet of the cabinet (1), a metal plate (3) is mounted on the inner wall of the cabinet (1) and the back of the cabinet door (2), a metal frame (9) is arranged at the edge of the front outlet of the cabinet (1), the outer edge of the metal frame (9) is welded to the metal plate (3) on the inner wall of the cabinet (1), air inlets are arranged at the bottom of the left and right side walls of the cabinet (1) and at corresponding positions of the metal plates on the left and right side walls, an air outlet is arranged at the top of the cabinet (1) and at corresponding positions of the top metal plate, a ventilation plate (4) and a filter (5) are mounted at the air inlet and the air outlet, an exhaust fan (6) is mounted at the top air outlet of the cabinet (1), three pairs of vertically distributed strip support plates (7) are mounted between the left and right inner walls of the cabinet (1), two symmetrical auxiliary heat dissipation structures (8) are mounted between each pair of strip support plates (7), and an active filter (10) is mounted on the top of each pair of strip support plates (7).

2. The anti-interference housing of an active filter according to claim 1, characterized in that: The auxiliary heat dissipation structure (8) comprises a first strip plate (8-1) and a second strip plate (8-2), the first strip plate (8-1) and the second strip plate (8-2) are both fixedly mounted between the strip support plates (7), a pair of slide bars (8-3) are mounted between the two strip plates, a slider (8-4) is slidably mounted on the slide bars (8-3), a vertical heat conduction plate (8-5) is mounted on the top of the slider (8-4), a plurality of heat sinks (8-6) are mounted on the side of the heat conduction plate (8-5) close to the second strip plate (8-2), the first strip plate ( A screw rod (8-7) is rotatably mounted between the first strip plate (8-1) and the second strip plate (8-2), a threaded through hole is provided on the slider (8-4), and the threaded through hole cooperates with the screw rod (8-7), a rotating shaft (8-8) is rotatably mounted on a side of the second strip plate (8-2) away from the first strip plate (8-1) through a bearing seat, a pair of mutually meshing bevel gears (8-9) are mounted between the rear end of the rotating shaft (8-8) and the rotating shaft of the screw rod (8-7), and a front end of the rotating shaft (8-8) passes through the strip support plate (7) and is mounted with a knob (8-10).

3. The anti-interference housing of an active filter according to claim 1, characterized in that: The metal plate (3) is an aluminum plate.

4. The anti-interference housing of an active filter according to claim 1, characterized in that: The ventilation plate (4) is an aluminum honeycomb ventilation plate.

5. The anti-interference housing of an active filter according to claim 1, characterized in that: The metal frame (9) is an aluminum rectangular frame.

6. The anti-interference housing of an active filter according to claim 1, characterized in that: Conductive paint is applied at the joint between the ventilation plate (4) and the metal plate (3) of the air inlet and outlet.

7. The anti-interference housing of an active filter according to claim 2, characterized in that: The heat conducting plates (8-5) of the two auxiliary heat dissipation structures (8) between each pair of strip-shaped support plates (7) are arranged opposite to each other.

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