Insulation base plate supporting structure capable of increasing voltage-withstanding distance

Abstract

The utility model discloses an insulating base plate supporting structure capable of enhancing voltage withstanding distance, which comprises an insulating base plate, the insulating base plate is a step type structure formed by a high-order part and a low-order part, and a fixing groove is arranged on the surface of the high-order part higher than the low-order part. A positioning hole and a fixing groove are formed in the surface, flush with the high-order part, of the low-order part, the insulating base plate is fixed between the PCB and the case metal shell, and the fixing groove of the high-order part and a high-voltage area of the PCB are fixedly installed through a fastener. And the positioning hole and the fixing groove of the low-step part are fixedly mounted with the case metal shell through a positioning pin and a fastener respectively. The utility model is suitable for the fixed design of high and low voltage coexisting PCBs, optimizes the creepage distance and voltage resistance through a specific geometric structure, ensures that the safety standards of the pollution level 2 and the material group II are met, and enhances the electrical isolation effect of high and low voltage areas.

Description

TECHNICAL FIELD

[0001] The utility model relates to the electrical insulation and fixed structure technical field of electronic equipment, concretely relates to an insulation backing board support structure of reinforced withstand voltage distance. BACKGROUND

[0002] In the PCB (printed circuit board) layout design of the existing 3200V high voltage machine type, in order to meet the creepage distance requirement, according to the standard of pollution level 2, material group II, the creepage distance of secondary circuit needs to reach 22mm. Since the PCB adopts the metal screw pressure contact fixed mode, therefore, in the metal contact area of 22mm diameter, electronic components cannot be laid out, thereby leading to that the available space of PCB is seriously limited, the compactness of overall layout is affected, and the design difficulty and material waste are increased. UTILITY MODEL CONTENTS

[0003] The utility model discloses a kind of insulation backing boards of reinforced withstand voltage distance, and it is suitable for the PCB fixed design of high-low voltage coexistence, including insulation backing board, the insulation backing board is the stepped structure of high-order part and low-order part, the surface of high-order part on higher low-order part is equipped with fixed groove, the surface of low-order part on with high-order part is equipped with positioning hole and fixed groove, the insulation backing board is fixed between PCB and case metal shell, the fixed groove of high-order part is fixedly installed by fastener with high voltage area of PCB, the positioning hole and fixed groove of low-order part are fixedly installed by positioning tip and fastener with case metal shell respectively.

[0004] The utility model discloses a kind of insulation backing boards of reinforced withstand voltage distance, and it is suitable for the PCB fixed design of high-low voltage coexistence, including insulation backing board, the insulation backing board is the stepped structure of high-order part and low-order part, the surface of high-order part on higher low-order part is equipped with fixed groove, the surface of low-order part on with high-order part is equipped with positioning hole and fixed groove, the insulation backing board is fixed between PCB and case metal shell, the fixed groove of high-order part is fixedly installed by fastener with high voltage area of PCB, the positioning hole and fixed groove of low-order part are fixedly installed by positioning tip and fastener with case metal shell respectively.

[0005] Further, the outer circle of the positioning hole is provided with a groove for increasing the insulation creepage distance between the positioning pin and the PCB.

[0006] Further, the insulation backing board and the case metal shell are provided with flame-retardant PC insulation paper.

[0007] Further, the insulation backing board is made of nylon PA66 insulation backing board containing 30% glass fiber.

[0008] Further, the positioning hole is located on one end of the low-order part of the insulation backing board, away from the high-order part.

[0009] Further, the fixed groove contains an embedded round nut, which is fixed by a screw to ensure stability.

[0010] The utility model technical scheme brings the beneficial effects of:

[0011] 1. The insulating pad for enhancing the withstand voltage distance of the utility model discloses a stepped design, through the specific geometry optimization creeping distance and withstand voltage performance, ensure to meet the safety standard of pollution level 2, material group II, enhance the electrical isolation effect of high and low voltage area;

[0012] 2, adopt double fixed mode, through the initial positioning of metal positioning pin, and adopt the embedded round nut of upper and lower surface to carry out mechanical fixation, thereby ensure the stability of insulating pad and PCB, prevent the structure loosening caused by vibration or environmental change;

[0013] 3, the outer circle of positioning hole is equipped with groove structure, through the specific space layout increases the insulation creeping distance between positioning pin and PCB, ensure to meet the safety requirement of 22mm and above creeping distance, effectively improve the withstand voltage capacity and long-term reliability of system. BRIEF DESCRIPTION OF DRAWINGS

[0014] Fig. 1 It is the top structure schematic view of the utility model.

[0015] Fig. 2 It is the bottom structure schematic view of the utility model.

[0016] Fig. 3 It is the sectional view of the utility model with PCB, case metal shell installation.

[0017] Among them, 1-case metal shell;2-flame-retardant PC insulating paper;3-cross countersunk screw;4-metal positioning pin;5-riveted stud;6-insulating pad;7-PCB;8-cross disc head screw;9-embedded round nut;10-groove;11-positioning hole. DETAILED DESCRIPTION

[0018] The technical scheme of the utility model will be explained in detail below, but the protection scope of the utility model is not limited to the embodiment.

[0019] For example, Figs. 1 to 3The utility model discloses an insulation pad support structure of reinforced pressure distance, applicable to the PCB 7 with high and low voltage is fixed to the case metal shell 1, including insulation pad 6, in this embodiment, adopt the insulation pad of nylon PA66 containing 30% glass fiber. The insulation pad 6 is the stepped structure of high order part and low order part, and the creeping distance and pressure resistance are optimized through specific geometry. The surface of the high order part higher than the low order part is provided with a fixing groove, and the surface of the low order part level with the high order part is provided with a positioning hole 11 and a fixing groove, the high order part of the insulation pad 6 is fixed and installed with the high voltage area of the PCB 7 through a fastener, and the positioning hole 11 and the fixing groove of the low order part are fixed and installed with the case metal shell 1 through a metal positioning pin 4 and a fastener. In this embodiment, the fixing groove contains an embedded round nut 9, and the fastener adopts a cross countersunk screw or a cross disc head screw. The outer circle of the positioning hole 11 is provided with a groove 10, the insulation creeping distance between the metal positioning pin 4 and the PCB 7 is increased through the groove structure, and the distance of the case metal shell 1 creeping to the PCB 7 through the insulation pad 6 is more than 22mm. The structure is designed through the stepped structure, and the embedded round nut is fixed in the upper and lower surfaces, so that the stability of the insulation support is effectively improved, the creeping distance requirement (>=22mm) of the secondary circuit is met, and the safety specifications such as pollution level 2 and material group II are met.

[0020] The utility model structure is compact, in this embodiment, the overall size is 35mm*10mm*9.25mm. The case metal shell 1 and the insulation plate 6 are further provided with flame-retardant PC insulation paper 2. The insulation pad 6 is placed on the flame-retardant PC insulation paper 2, and the size of the insulation pad 6 is small, so the metal positioning pin 4 is used to determine the rotation point, and then the cross countersunk screw 3 is used to fix the case metal shell 1. The PCB 7 is fixed on the high order part of the support structure through the cross disc head screw, and the insulation pressure resistance is improved in the high voltage area of the PCB 7 by using the insulation pad support structure, the distance from any direction of the insulation pad 6 to the peripheral diameter of the PCB fixing groove is more than 22mm, which not only meets the layout of the PCB, but also meets the creeping distance requirement; in the low voltage area of the PCB 7, the press-in stud 5 and the cross disc head screw 8 are used to fix the PCB 7 to the case metal shell 1, so as to reduce unnecessary material cost, and safety and economy are considered.

[0021] The utility model discloses an insulating cushion board support structure has the advantage that the fixed structure is simplified, and only through single screw and positioning pin can realize firm installation, reduces the component quantity, reduces assembly complexity, promotes installation efficiency. Meanwhile, the structure ensures fixed stability, avoids the space waste and wiring limited problem because of traditional multipoint fixing, thereby improves the layout flexibility of PCB and the rationality of overall structure design, and gives consideration to safety and economy. Meanwhile, it also enhances the flexibility of PCB design, and effectively improves the overall reliability and manufacturability.

[0022] As described above, although the utility model has been shown and expressed with reference to specific preferred embodiments, it must not be interpreted as a limitation on the utility model itself. Various changes can be made to it in form and details without departing from the spirit and scope of the utility model defined in the appended claims.

Claims

1. An insulating pad support structure for enhancing withstand voltage distance, characterized in that, The device includes an insulating pad, which has a stepped structure consisting of a high-level part and a low-level part. The surface of the high-level part that is higher than the low-level part has a fixing groove, and the surface of the low-level part that is flush with the high-level part has a positioning hole and a fixing groove. The insulating pad is fixed between the PCB and the metal casing of the chassis. The fixing groove of the high-level part is fixedly installed to the high-voltage area of ​​the PCB by fasteners, and the positioning hole and fixing groove of the low-level part are fixedly installed to the metal casing of the chassis by positioning pins and fasteners, respectively.

2. The insulating pad support structure for enhancing withstand voltage distance according to claim 1, characterized in that, The outer ring of the positioning hole is provided with a groove.

3. The insulating pad support structure for enhancing withstand voltage distance according to claim 1, characterized in that, Flame-retardant PC insulating paper is provided between the insulating pad and the metal outer shell of the chassis.

4. The insulating pad support structure for enhancing withstand voltage distance according to claim 1, characterized in that, The insulating pad is made of nylon PA66 containing 30% glass fiber.

5. The insulating pad support structure for enhancing withstand voltage distance according to claim 1, characterized in that, The positioning hole is located on the lower part of the insulating pad, away from the higher part.

6. The insulating pad support structure for enhancing withstand voltage distance according to claim 1, characterized in that, The fixing groove contains an embedded round nut.

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