Insulation column structure for increasing creepage distance

Abstract

The utility model belongs to the field of photovoltaic energy storage inverters, and discloses an insulating column structure for increasing creepage distance. The periphery of the insulator is provided with an integrally-formed connecting plate which radially extends in the direction away from the center of the insulator, and an annular outer wall perpendicular to the connecting plate is integrally formed at the far end of the connecting plate to jointly form an insulating column structure body. A broken line outline is formed on the outer surface of the insulation column structure body. Therefore, on the premise that the height of the insulator is limited, the creepage distance is increased, so that the insulator meets the requirements of safety regulations.

Description

Technical Field

[0001] The utility model belongs to the field of photovoltaic energy storage inverters, in particular to an insulating column structure with increased creepage distance. Background Art

[0002] When the IGBT (insulated gate bipolar transistor) module is crimped onto the PCB (printed circuit board), the deformation of the circuit board (PCBA) needs to be minimized to ensure good heat dissipation performance. To this end, it is necessary to add support points around the IGBT module and lock it to the aluminum heat sink. The existing PCBA board has a small distance from the metal lock below, with a height of only 12mm. The cylindrical and hexagonal columnar structures made of conventional bulk molding compound (BMC) cannot achieve the required creepage distance and cannot meet the 1500V safety regulations. Utility Model Content

[0003] The purpose of the utility model is to propose an insulating column structure with increased creepage distance, wherein the outer periphery of the insulator has an integrally formed annular outer wall extending toward the distal end, forming an insulating column body with an outer surface having a broken line contour, thereby increasing the creepage distance to meet the requirements of safety regulations.

[0004] To achieve the above purpose, the utility model provides an insulating column structure with increased creepage distance, including an insulator, the outer periphery of the insulator has an integrally formed connecting plate extending radially away from the center, and the distal end of the connecting plate is integrally formed with an annular outer wall perpendicular to the connecting plate, together forming an insulating column structure body; the outer surface of the insulating column structure body forms a broken line outer contour. Thus, under the premise of limited insulator height, the creepage distance is increased to meet the safety regulations.

[0005] Preferably, the thickness of the connecting plate is less than the height of the annular outer wall. Thus, more broken lines are formed, the contour is further enlarged, and the creepage distance is also increased accordingly, thereby improving the insulation safety of the insulating column structure body. Preferably, vertical ribs are arranged vertically downward on the lower surface of the connecting plate. Further, by increasing the number of broken lines on the outer surface, the distance of the broken line outer contour formed on the outer surface of the insulating column structure body is increased.

[0006] Preferably, the bottom surface of the connecting plate is a plane, and the top surface of the connecting plate is integrally formed with at least two circles of concentrically arranged annular outer walls.

[0007] Preferably, the insulator has a first end face and a second end face parallel to the first end face, the first end face is provided with a first mounting hole, the second end face is provided with a second mounting hole corresponding to the position of the first mounting hole and not connected to the first mounting hole, an insert nut is installed in the first mounting hole, and an insert screw is installed in the second mounting hole.

[0008] Preferably, the insert nut and the insert screw are injection-molded and installed in their respective corresponding mounting holes, thereby improving the connection strength between the two and reducing the frequency of the problem of the insert nut and / or the insert screw being loosened during the vibration test.

[0009] Preferably, a first anti-loosening structure is coaxially connected to the upper surface of the insert nut, and the outer periphery of the first anti-loosening structure is a polygonal or knurled structure.

[0010] Preferably, a second anti-loosening structure is coaxially connected to the upper surface of the screw head of the insert screw, and the outer periphery of the second anti-loosening structure is a polygonal or knurled structure.

[0011] The use of an anti-loosening structure with a polygonal or knurled outer circumference can increase the undercut between the inner wall thread of the mounting hole, effectively preventing excessive external force generated during transportation vibration from causing it to loosen, which in turn leads to poor heat dissipation of the IGBT module and failure of the entire machine.

[0012] Preferably, the upper half of the insulator is integrally formed with a clamping portion, the bottom surface of the clamping portion contacts the upper surface of the connecting plate, and the top surface of the clamping portion is higher than the upper surface of the annular outer wall. This makes it easier to use tools in conjunction with the clamping portion to achieve installation and removal operations. The clamping portion serves to avoid the pins of the PCBA board in a larger area, allowing it to arrange more components, while allowing it to adapt to the pin heights of different models, thereby improving the applicability of the insulating column structure.

[0013] Preferably, the insert nut and the insert screw are made of copper, stainless steel or 45# steel. Materials with different breaking torques are selected according to different working conditions.

[0014] The beneficial effects brought by the utility model are as follows: an annular outer wall is integrally formed on the outer periphery of the insulator, and its local diameter is increased while the height of the insulator remains unchanged to form an insulating column structure body, and the distance of its outer surface contour is increased, that is, the creepage distance is increased, so that the insulating column structure body meets the requirements of safety regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional structural schematic diagram of an insulating column structure with increased creepage distance according to the utility model;

[0016] Figure 2 It is a schematic diagram of the isometric structure from a first perspective of an insulating column structure for increasing creepage distance of the utility model;

[0017] Figure 3 It is a schematic diagram of the isometric structure from a second perspective of an insulating column structure for increasing creepage distance of the utility model;

[0018] Figure 4aIt is a schematic diagram of the top view of the structure of an insert nut of an insulating column structure with increased creepage distance according to the utility model;

[0019] Figure 4b for Figure 4a A side view schematic diagram of the structure;

[0020] Figure 5a It is a schematic diagram of the top view of the structure of an insert screw of an insulating column structure with increased creepage distance according to the utility model;

[0021] Figure 5b for Figure 5a A side view schematic diagram of the structure;

[0022] Figure 6 This is a schematic structural diagram of an insulating column structure with vertical ribs for increasing creepage distance according to the utility model;

[0023] Figure 7 The utility model is a structural schematic diagram of an insulating column structure with increased creepage distance, in which the bottom surface of a connecting plate is a plane.

[0024] Among them, 100-insulator, 101-first end face, 1011-first mounting hole, 102-second end face, 1021-second mounting hole, 200-insert nut, 210-first anti-loosening structure, 300-insert screw, 310-second anti-loosening structure, 400-connecting plate, 410-vertical rib, 500-annular outer wall, 600-clamping portion. DETAILED DESCRIPTION

[0025] The specific implementation methods of the present invention are further described below in conjunction with the accompanying drawings. It should be noted that the description of these implementation methods is used to help understand the present invention, but does not constitute a limitation of the present invention. In addition, the technical features involved in each implementation method of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0026] The utility model provides an insulating column structure with increased creepage distance, which is used to provide support points around the IGBT module and fix it to the aluminum heat sink. Figure 1-Figure 5bAs shown, it includes an insulator 100, which is cylindrical and has a first end face 101 and a second end face 102 parallel to the first end face 101. The first end face 101 and the second end face 102 are respectively provided with a first mounting hole 1011 and a second mounting hole 1021. The first mounting hole 1011 and the second mounting hole 1021 correspond to each other in position and are not connected. The insert nut 200 and the insert screw 300 are respectively injection-molded and installed in the first mounting hole 1011 and the second mounting hole 1021. The injection molding method is used to improve the connection strength and reduce the frequency of the problem of the insert nut 200 and / or the insert screw 300 loosening in the vibration test. Preferably, in order to further improve the anti-loosening effect, the upper surface of the insert nut 200 is coaxially connected with a first anti-loosening structure 210, and the outer peripheral surface of the first anti-loosening structure 210 is a polygonal or knurled structure such as a pentagon, hexagon or heptagon; preferably, it is a hexagonal nut, the diameter of which is larger than the diameter of the insert nut 200 and smaller than the inner diameter of the first mounting hole 1011, and is installed in coordination with it; the upper surface of the screw head of the insert screw 300 is coaxially connected with a second anti-loosening structure 310, and the outer peripheral surface of the second anti-loosening structure 310 is a polygonal or knurled structure such as a pentagon, hexagon or heptagon; preferably, it is a hexagonal nut, which is fixed to the screw head of the insert screw 300 as an integral structure and is installed in coordination with the second mounting hole 1021. The use of an anti-loosening structure with a hexagonal outer periphery can increase the amount of undercut between it and the inner wall thread of the mounting hole, effectively avoiding excessive external force generated during transportation vibration and causing it to loosen, thereby causing poor heat dissipation of the IGBT module and causing the failure of the entire machine. The insert nut 200 and the insert screw 300 are made of stainless steel or copper, which can effectively increase the breaking torque of the entire insulating column structure, reduce the damage or destruction caused by external forces, and increase the service life; 45# steel is preferably used, which has a greater breaking torque and a longer service life.

[0027] In order to increase the creepage distance of the insulator 100 and solve the problem that the distance between the PCBA board and the metal lock component below is too small to meet the 1500V safety regulations, the outer periphery of the insulator 100 has an integrally formed connecting plate 400 extending radially away from the center, and the far end of the connecting plate 400 is integrally formed with an annular outer wall 500 perpendicular to it, and the connecting plate 400 is located in the middle section of the outer periphery of the insulator 100. The thickness of the connecting plate 400 is less than the height of the annular outer wall 500, forming an outer contour with a broken line, thereby increasing the creepage distance. Figure 1 As shown, the creepage distance is L1+L2+L3+L4+L5+L6+L7+L8+L9+L10+L11, which is the distance between two conductive parts measured on the insulating surface of the insulator 100. The creepage distance must meet the requirements of safety regulations to eliminate safety hazards.

[0028] In order to further increase the creepage distance in a limited space, such as Figure 6As shown, vertical ribs 410 extending vertically downward are arranged on the lower surface of the connecting plate 400, the lower surface of the vertical ribs 410 and the lower surface of the annular outer wall 500 are in the same plane, the width of the vertical ribs 410 is ≥1mm, and the distance between two adjacent vertical ribs 410 is ≥1mm. Each additional vertical rib 410 is equivalent to increasing the creepage distance by the length of two vertical ribs 410, and the insulation performance of the insulating column structure is further improved under the premise of meeting safety regulations. A stepped outer surface can also be formed on the periphery of the insulator 100, and the creepage distance can be increased by multiple broken line outer contours.

[0029] Furthermore, the inner diameter of the annular outer wall 500 is larger than the outer diameter of the sleeve connected thereto, so that the contact section between the sleeve and the insulator is lengthened, which facilitates the installation of the sleeve and avoids the problem of excessive or insufficient torque. The connection between the sleeve and the insulator is a prior art, and the structure of the sleeve and the connection method between the two are not repeated here.

[0030] Furthermore, if Figure 2 As shown, a clamping portion 600 is integrally formed and connected to the upper half of the insulator 100. The clamping portion 600 is selected to be hexagonal or has a parallel opposite side structure. It is used to achieve installation and disassembly using standard tools to increase convenience. The bottom surface of the clamping portion 600 contacts the upper surface of the connecting plate 400. The top surface of the clamping portion 600 is higher than the upper surface of the annular outer wall 500, which plays a role in avoiding the pins of the PCBA board. Because the pin heights of different models are different, in order to make the insulating column structure adapt to the pin heights of different models, the distance between the top surface of the clamping portion 600 and the upper surface of the annular outer wall 500 is 4.5mm to 5.5mm.

[0031] like Figure 7 As shown, in this embodiment, the bottom surface of the connecting plate 400 is a plane, and two concentrically arranged annular outer walls 500 are integrally formed on the top surface of the connecting plate 400, and the spacing between the two annular outer walls 500 is ≥1mm. The two annular outer walls 500 are arranged, and the creepage distance must climb the height of the two annular outer walls 500. The number of outer surface fold lines is increased to increase the creepage distance. The bottom surface of the connecting plate 400 is a plane, and an insulating component with a fold line profile on the outer surface can be added below to further increase the creepage distance.

[0032] The utility model increases the creepage distance, that is, the distance between two conductive parts, by configuring the insulator 100 to have an integrally formed connecting plate 400 on its outer periphery, configuring an annular outer wall 500 at the far end of the connecting plate 400, and adding vertical ribs 410 to the connecting plate 400 or configuring two circles of the annular outer wall 500, so as to achieve a sufficient creepage distance, meet safety regulations, improve safety, and reduce potential safety hazards, under the premise that the height of the insulator 100 is limited.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An insulating column structure with increased creepage distance, comprising an insulator, characterized in that: The outer periphery of the insulator has an integrally formed connecting plate extending radially away from its center, and the distal end of the connecting plate is integrally formed with an annular outer wall perpendicular thereto, together forming an insulating column structure body; the outer surface of the insulating column structure body forms a broken line outer contour.

2. The insulating column structure with increased creepage distance as claimed in claim 1, characterized in that: The thickness of the connecting plate is smaller than the height of the annular outer wall.

3. The insulating column structure with increased creepage distance as claimed in claim 1, characterized in that: The lower surface of the connecting plate is provided with vertical ribs extending vertically downward.

4. The insulating column structure with increased creepage distance according to claim 1, characterized in that: The bottom surface of the connecting plate is a plane, and the top surface of the connecting plate is integrally formed with at least two circles of concentrically arranged annular outer walls.

5. The insulating column structure with increased creepage distance as claimed in claim 1, characterized in that: The insulator has a first end face and a second end face parallel to the first end face, a first mounting hole is opened on the first end face, a second mounting hole corresponding to the position of the first mounting hole and not connected to the second end face is opened on the second end face, an insert nut is installed in the first mounting hole, and an insert screw is installed in the second mounting hole.

6. The insulating column structure with increased creepage distance as claimed in claim 5, characterized in that: The insert nut and the insert screw are injection-molded and installed in their corresponding installation holes.

7. The insulating column structure with increased creepage distance as claimed in claim 5, characterized in that: The upper surface of the insert nut is coaxially connected with a first anti-loosening structure, and the outer periphery of the first anti-loosening structure is a polygonal or knurled structure.

8. The insulating column structure with increased creepage distance as claimed in claim 5, characterized in that: A second anti-loosening structure is coaxially connected to the upper surface of the screw head of the insert screw, and the outer periphery of the second anti-loosening structure is a polygonal or knurled structure.

9. The insulating column structure with increased creepage distance as claimed in claim 2, characterized in that: The upper half of the insulator is integrally formed with a clamping portion, the bottom surface of the clamping portion contacts the upper surface of the connecting plate, and the upper surface of the clamping portion is higher than the upper surface of the annular outer wall.

10. An insulating column structure with increased creepage distance as claimed in any one of claims 5 to 8, characterized in that: The insert nut and the insert screw are made of copper, stainless steel or 45# steel.

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