A mechanical fixing device for busbars used in harmonic mitigation in low-impedance regions

Abstract

This utility model discloses a busbar mechanical fixing device for harmonic mitigation in low-impedance areas, relating to the fields of power electronics and power transmission and distribution technology. It includes several mounting frames arranged in sequence, each mounting frame comprising a horizontally positioned support plate and a limiting plate vertically positioned at the end of the support plate. The upper parts of the mounting frames collectively support two electromagnetic shielding baffles for electromagnetic shielding protection of the busbar. Each of the two electromagnetic shielding baffles has a heat dissipation groove on its opposite surface, arranged axially and with open ends. This utility model not only provides effective electromagnetic shielding protection for the busbar, effectively reducing magnetic field interference between adjacent busbars, lowering impedance and temperature rise, but also effectively improves the vibration resistance and stability of the busbar.

Description

Technical Field

[0001] This utility model relates to the fields of power electronics and power transmission and distribution technology, and in particular to a busbar mechanical fixing device for harmonic control in low impedance areas. Background Technology

[0002] In power systems, busbars are core components for power distribution, and the stability of their mechanically fixed structure directly affects the system's safety and efficiency. Especially in low-impedance region harmonic mitigation technologies, the installation of busbars faces the following technical challenges:

[0003] 1. Skin effect and proximity effect caused by high frequency harmonics: High frequency harmonic current will cause uneven current distribution in conductors (skin effect), and increase resistance loss due to magnetic field interference from adjacent conductors (proximity effect), resulting in abnormal heating of the busbar. Existing fixing devices mostly adopt simple support structures, which make it difficult to optimize magnetic field distribution and cannot effectively reduce impedance and temperature rise.

[0004] 2. Electromagnetic interference and heat dissipation are contradictory. Dense busbar layout will couple high-frequency harmonic magnetic fields, which will aggravate system noise. In the existing technology, electromagnetic shielding covers often sacrifice heat dissipation performance, while heat dissipation slot design may weaken the shielding effect. It is difficult to achieve both.

[0005] 3. Mechanical loosening caused by harmonic vibration: High current harmonics can cause electromagnetic vibration of the busbar. Long-term operation can easily lead to loosening of bolts, increased contact resistance, and even arcing. Traditional anti-loosening bolts or rigid clamps lack vibration reduction design and cannot adapt to high-frequency vibration environment.

[0006] Therefore, there is an urgent need for a mechanical fixing device for busbars that can overcome the above-mentioned shortcomings. Utility Model Content

[0007] To overcome the shortcomings of the prior art, this utility model discloses a busbar mechanical fixing device for harmonic control in low impedance areas. This utility model can not only provide effective electromagnetic shielding protection for the busbar, effectively reduce magnetic field interference between adjacent busbars, reduce impedance and temperature rise, but also effectively improve the vibration resistance and stability of the busbar.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] A busbar mechanical fixing device for harmonic mitigation in low-impedance regions, comprising:

[0010] Several mounting brackets are arranged in sequence. Each mounting bracket includes a horizontally positioned support plate and a vertically positioned limiting plate at the end of the support plate.

[0011] Two electromagnetic shielding baffles are supported on the support plates of several mounting brackets and are set parallel to the limiting plate. The two electromagnetic shielding baffles form a clamping space for clamping the busbar, which is used to provide electromagnetic shielding protection for the busbar.

[0012] Among them, the two electromagnetic shielding baffles are provided with heat dissipation grooves on their opposite surfaces, which are arranged along their axial direction and have open structures at both ends. The heat dissipation grooves are used to reduce the contact area between the electromagnetic shielding baffles and the busbar and to form a ventilation and heat dissipation channel.

[0013] Several bolts, passing through the electromagnetic shielding baffle, busbar, and limiting plate, are used to clamp and fix the busbar.

[0014] Furthermore, the bottom surface of the heat dissipation groove is provided with a protruding ridge that is arranged along the axial direction of the heat dissipation groove and protrudes from the heat dissipation groove. An insulating pad that abuts against the busbar can be detachably installed on the end face of the protruding ridge.

[0015] Furthermore, the convex end face is provided with a mounting groove that is arranged along the convex axial direction and has an open structure at both ends, and the back face of the insulating pad is provided with a mounting strip that is interference-fitted with the mounting groove.

[0016] Furthermore, both electromagnetic shielding plates have an insulating coating on their opposite sides.

[0017] Furthermore, the lower part of the electromagnetic shielding baffle is provided with a notch that is compatible with the support plate.

[0018] Furthermore, the end of the support plate away from the limiting plate is provided with fixing screw holes for suspending and fixing the mounting bracket.

[0019] Furthermore, a support member for horizontally supporting the support plate is provided on the lower part of the mounting bracket near the limiting plate.

[0020] Furthermore, the support components include:

[0021] The support rod is vertically installed at the bottom of the support plate and is fixedly connected to the cabinet body;

[0022] The inner rod is located inside the support rod and is engaged with the support rod through a self-locking threaded pair. The upper end of the inner rod rotates through the support plate, and its end face is on the same plane as the support plate. The upper end face of the inner rod is provided with a countersunk rotating hole for driving the inner rod to rotate and realizing the extension and retraction adjustment of the support member.

[0023] Furthermore, the rotating hole has a cross-shaped or straight-line structure.

[0024] Furthermore, the limiting plate surface is provided with mounting screw holes, and the electromagnetic shielding baffle plate surface is provided with threaded through holes that correspond to and match the mounting screw holes. The bolts are threadedly engaged with the mounting screw holes and the threaded through holes.

[0025] Compared with the prior art, the beneficial effects of this utility model are: by setting two electromagnetic shielding baffles, which can be clamped on both sides of the busbar, not only can the busbar be electromagnetically shielded and protected, but also the vertical stability of the busbar installation can be guaranteed.

[0026] By setting up heat dissipation slots, the contact area between the electromagnetic shielding baffle and the busbar is effectively reduced, while airflow channels are formed, achieving ventilation and heat dissipation for the busbar.

[0027] By setting up insulating pads, not only can the busbars be insulated and protected, but also vibration-damping buffer protection can be achieved between the busbars and the electromagnetic shielding baffle.

[0028] By setting up support components, horizontal support can be achieved for the mounting frame, providing strong support for the horizontal and stable installation of the busbar.

[0029] By providing a notch at the bottom of the electromagnetic shielding baffle, the electromagnetic shielding baffle can remain vertically stable at the top of the support plate, providing strong support for the efficient and stable clamping of the busbar in the future.

[0030] This invention, while ensuring normal heat dissipation of the busbar, can not only provide effective electromagnetic shielding protection for the busbar, effectively reduce magnetic field interference between adjacent busbars, reduce impedance and temperature rise, but also effectively improve the vibration resistance and stability of the busbar. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of this utility model;

[0032] Figure 2 This is a schematic diagram of the mounting frame and support structure of this utility model;

[0033] Figure 3 This is a schematic diagram of the electromagnetic shielding baffle structure of this utility model;

[0034] Figure 4 This is a schematic diagram of the installation structure of the insulating pad of this utility model.

[0035] In the diagram: 1. Mounting bracket; 1.1. Limiting plate; 1.1.1. Mounting screw hole; 1.2. Support plate; 1.2.1. Fixing screw hole; 2. Support component; 2.1. Support rod; 2.2. Inner rod; 2.2.1. Countersunk rotating hole; 2.3. Base; 3. Electromagnetic shielding baffle; 3.1. Threaded through hole; 3.2. Heat dissipation groove; 3.2.1. Raised ridge; 3.2.1.1. Mounting groove; 3.3. Insulating pad; 3.3.1. Mounting strip; 3.4. Recess; 4. Bolt. Detailed Implementation

[0036] The technical solution of this utility model will be described below with reference to the accompanying drawings of the embodiments of this utility model. In the description, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right" indicating the orientation or positional relationship, they are only corresponding to the drawings of this utility model for the convenience of describing this utility model, and do not indicate or imply that the device or element referred to must have a specific orientation.

[0037] Please refer to the instruction manual appendix. Figure 1-4 This utility model provides a technical solution:

[0038] Example 1: A busbar mechanical fixing device for harmonic mitigation in low impedance areas includes several mounting frames 1 arranged in sequence. Each mounting frame 1 includes a horizontally arranged support plate 1.2 and a limiting plate 1.1 vertically arranged at the end of the support plate 1.2. The end of the support plate 1.2 away from the limiting plate 1.1 is provided with a fixing screw hole 1.2.1. The mounting frame 1 can be suspended and fixedly installed in a low-voltage distribution cabinet, high-voltage switch cabinet or power electronic equipment through the fixing screw hole 1.2.1.

[0039] Several mounting brackets 1 are supported by two electromagnetic shielding baffles 3. Specifically, the two electromagnetic shielding baffles 3 are set on the support plate 1.2 and are parallel to the limiting plate 1.1. In order to ensure the vertical and stable installation of the electromagnetic shielding baffles 3 on the support plate 1.2, the lower part of the electromagnetic shielding baffles 3 is provided with a notch 3.4 that is compatible with the support plate 1.2. The two electromagnetic shielding baffles 3 form a clamping space for clamping the busbar, which is used to provide electromagnetic shielding protection for the busbar. In order to achieve clamping and fixing the busbar, the limiting plate 1.1 is provided with mounting screw holes 1.1.1, and the electromagnetic shielding baffles 3 are provided with threaded through holes 3.1 that are compatible with the mounting screw holes 1.1.1. The corresponding mounting screw holes 1.1.1 and threaded through holes 3.1 are provided with bolts 4 that penetrate the busbar.

[0040] To ensure effective heat dissipation of the busbar, each of the two electromagnetic shielding baffles 3 has a heat dissipation groove 3.2 on its opposite surface, which is arranged along its axial direction and has an open structure at both ends. The heat dissipation groove 3.2 is used to reduce the contact area between the electromagnetic shielding baffles 3 and the busbar and to form a ventilation and heat dissipation channel.

[0041] In Example 2, harmonics may cause electromagnetic vibration of the busbar (especially in high-current applications). Long-term vibration can lead to loose bolts, increased contact resistance, and even arcing. It can also cause frictional damage between the busbar and the electromagnetic shielding baffle 3. To address this, the bottom surface of the heat dissipation groove 3.2 is provided with a protruding ridge 3.2.1 that is axially aligned with the heat dissipation groove 3.2. The end face of the protruding ridge 3.2.1 is detachably fitted with an insulating pad 3.3 that contacts the busbar. Specifically, the end face of the protruding ridge 3.2.1 is provided with an installation groove 3.2.1.1 that is axially aligned with the protruding ridge 3.2.1 and has open ends. The back face of the insulating pad 3.3 is provided with an installation strip 3.3.1 that is interference-fitted with the installation groove 3.2.1.1. The insulating pad 3.3 not only provides insulation protection for the busbar but also effectively provides vibration damping protection. To further improve the insulation protection performance, both back faces of the electromagnetic shielding baffles 3 are provided with an insulating coating.

[0042] In Example 3, during the suspended installation process, the mounting bracket 1 relies entirely on the fixing bolts in the fixing screw holes 1.2.1 for positioning. Harmonic vibrations can easily cause the mounting bracket 1 to loosen and lose its horizontal position, thus affecting the stable installation of the busbar. Therefore, a support member 2 is provided on the lower part of the mounting bracket 1 near the limiting plate 1.1 to provide horizontal support for the support plate 1.2. Specifically, the support member 2 includes a support rod 2.1 vertically set at the lower part of the support plate 1.2. The lower end of the support rod 2.1 is provided with a base 2.3, which is used to weld or bolt to the cabinet or electrical equipment. The support rod 2.1 is fitted with a self-locking threaded pair. The inner rod 2.2, with its self-locking threaded joint, effectively prevents accidental rotation due to vibration. To achieve the lifting and lowering adjustment of the inner rod 2.2, the upper end of the inner rod 2.2 rotates through the support plate 1.2, and its end face is on the same plane as the support plate 1.2. The upper end face of the inner rod 2.2 is provided with a countersunk rotating hole 2.2.1 for driving the inner rod 2.2 to rotate and realizing the telescopic adjustment of the support member 2. The rotating hole 2.2.1 has a cross-shaped or straight structure. By inserting a suitable screwdriver into the countersunk rotating hole 2.2.1, the lifting and lowering adjustment of the inner rod 2.2 can be driven, thereby ensuring the horizontal and stable support of the support member 2 for the mounting bracket 1.

[0043] The parts of this utility model not described in detail are prior art. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that this utility model can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments should be regarded as exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims in this utility model, and no reference numerals in the claims should be regarded as limiting the content of the claims.

Claims

1. A busbar mechanical fixture for low impedance area harmonic mitigation, characterized by, include: Several mounting brackets (1) are arranged in sequence. Each mounting bracket (1) includes a horizontally arranged support plate (1.2) and a limiting plate (1.1) vertically arranged at the end of the support plate (1.2). Two electromagnetic shielding baffles (3) are supported on the support plate (1.2) of several mounting brackets (1) and are set parallel to the limiting plate (1.1). The two electromagnetic shielding baffles (3) form a clamping space for clamping the busbar, which is used to electromagnetically shield the busbar. Among them, the two electromagnetic shielding baffles (3) are provided with heat dissipation grooves (3.2) arranged along their axial direction and with open structures at both ends. The heat dissipation grooves (3.2) are used to reduce the contact area between the electromagnetic shielding baffles (3) and the busbar and to form a ventilation and heat dissipation channel. Several bolts (4) pass through the electromagnetic shielding baffle (3), the busbar and the limiting plate (1.1) to clamp and fix the busbar.

2. A mechanical busbar mounting device for low impedance area harmonic mitigation according to claim 1, characterized in that: The bottom surface of the heat dissipation groove (3.2) is provided with a protruding ridge (3.2.1) that is arranged along the axial direction of the heat dissipation groove (3.2) and protrudes from the heat dissipation groove (3.2). An insulating pad (3.3) that abuts against the busbar can be detachably installed on the end face of the protruding ridge (3.2.1).

3. A busbar mechanical fixation device for low impedance area harmonic mitigation according to claim 2, characterized in that: The end face of the protruding ridge (3.2.1) is provided with a mounting groove that is axially arranged along the protruding ridge (3.2.1) and has open ends. 3.2.1.1), the back of the insulating pad (3.3) is provided with an installation strip (3.3.1) that is interference fit with the mounting groove (3.2.1.1).

4. A busbar mechanical fixation device for low impedance area harmonic mitigation according to claim 2, characterized in that: Both sides of the electromagnetic shielding baffles (3) are provided with an insulating coating.

5. A busbar mechanical fixing device for harmonic mitigation in low-impedance regions according to claim 1, characterized in that: The lower part of the electromagnetic shielding baffle (3) is provided with a notch (3.4) that is compatible with the support plate (1.2).

6. A busbar mechanical fixation device for low impedance area harmonic mitigation as claimed in claim 1, characterized in that: The support plate (1.2) has a fixing screw hole (1.2.1) at one end of its surface away from the limiting plate (1.1) for suspending and fixing the mounting bracket (1).

7. A busbar mechanical fixation device for low impedance area harmonic mitigation according to claim 6, characterized in that: The mounting bracket (1) has a support member (2) on the side near the limiting plate (1.1) at the bottom for horizontal support of the support plate (1.2).

8. A mechanical busbar mounting arrangement for low impedance area harmonic mitigation according to claim 7, characterized in that: Support member (2) includes: The support rod (2.1) is vertically installed at the bottom of the support plate (1.2) and fixedly connected to the cabinet body; The inner rod (2.2) is located inside the support rod (2.1) and is engaged with the support rod (2.1) through a self-locking threaded pair. The upper end of the inner rod (2.2) rotates through the support plate (1.2) and its end face is on the same plane as the support plate (1.2). The upper end face of the inner rod (2.2) is provided with a countersunk rotating hole (2.2.1) for driving the inner rod (2.2) to rotate and realizing the extension and retraction adjustment of the support member (2).

9. A busbar mechanical fixation device for low impedance area harmonic mitigation according to claim 8, characterized in that: The rotating hole (2.2.1) has a cross-shaped or straight-line structure.

10. A mechanical busbar mounting device for low impedance area harmonic mitigation as claimed in claim 1, wherein: The limiting plate (1.1) has mounting screw holes on its surface. 1.1.1), the electromagnetic shielding baffle (3) has a threaded through hole (3.1) that is compatible with the mounting screw hole (1.1.1), and the bolt (4) is threadedly engaged with the mounting screw hole (1.1.1) and the threaded through hole (3.1).

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