A PCB board structure with moisture-proof performance

Abstract

The invention discloses a PCB board structure with moisture-proof performance, belonging to the technical field of PCB boards. The invention can meet the heat dissipation demand of the PCB board body by setting a heat dissipation frame, and at the same time use an exhaust pipe to provide isolation support, and an external moisture absorption beam can timely sense the air humidity of the outside. When there is more moisture, the moisture will be absorbed by the external moisture absorption beam and transported to the isolation cover inside the exhaust pipe, so that the isolation cover is partially dissolved, thereby no longer blocking the overflow ball. At this time, the overflow ball can actively approach and contact the elastic oil bag under the magnetic attraction of the magnetic suction column, and change from the original heat insulation state to the heat conduction state. The overflow ball will overflow in the heated state, and release the gas to the outside through the exhaust pipe, squeeze out the moisture in the space between the PCB board body and the heat dissipation frame, improve the invasion of moisture, and at the same time warn the outside through the color change phenomenon of the pre-broken comb, so that measures can be taken in time to prevent the PCB board body from being damaged by moisture.

Description

Technical Field

[0001] The present invention relates to the technical field of PCB boards, and more particularly to a PCB board structure with moisture-proof performance. Background Art

[0002] PCB, whose Chinese name is printed circuit board, is also called printed circuit board. It is an important electronic component, a support for electronic components, and a carrier for electrical connection of electronic components. Since it is made by electronic printing technology, it is called "printed" circuit board. PCB, short for printed circuit board, is one of the important components of the electronics industry. Almost every electronic device, from electronic watches and calculators to computers, communication electronic equipment, and military weapon systems, as long as there are electronic components such as integrated circuits, must use printed boards to make electrical interconnections between various components. The printed circuit board consists of an insulating base plate, connecting wires, and pads for assembling and welding electronic components. It has the dual functions of a conductive line and an insulating base plate.

[0003] However, the existing PCB boards have poor moisture resistance and are easily invaded by moisture in a high humidity environment, causing circuit short circuits or insulation damage. It is also difficult for technicians to know the moisture resistance of the PCB boards in a timely manner and to provide targeted protection to avoid damage. Summary of the invention

[0004] 1. Technical issues to be solved

[0005] In view of the problems existing in the prior art, the purpose of the present invention is to provide a PCB board structure with moisture-proof performance. The heat dissipation demand of the PCB board body can be met by setting a heat dissipation frame, and the exhaust pipe is used to provide isolation support. The external moisture absorption beam can timely sense the external air humidity. When there is more moisture, the moisture will be absorbed by the external moisture absorption beam and transported to the isolation cover on the inner side of the exhaust pipe, so that the isolation cover will be partially dissolved, so that the overflow ball will no longer be blocked. At this time, the overflow ball can actively approach and contact the elastic oil bag under the magnetic attraction of the magnetic column, and change from the original heat insulation state to the heat conduction state. The overflow ball will overflow when heated and release it to the outside through the exhaust pipe, squeezing out the moisture in the space between the PCB board body and the heat dissipation frame, improving the moisture invasion. At the same time, the color change phenomenon of the pre-breaking comb is used to warn the outside world, so that measures can be taken in time to prevent the PCB board body from being damaged by moisture.

[0006] 2. Technical solution

[0007] To solve the above problems, the present invention adopts the following technical solutions.

[0008] A PCB board structure with moisture-proof performance comprises a PCB board body, a matching heat dissipation frame is provided on one side of the PCB board body, a plurality of evenly distributed exhaust pipes are fixedly connected between the PCB board body and the heat dissipation frame, and the exhaust pipes are distributed around the edge, an external moisture absorption bundle extending to the outside is inlaid on the exhaust pipe, the exhaust pipe comprises a middle tube, a heat conductive sheet and a visible sheet, the heat conductive sheet and the visible sheet are respectively connected to the upper and lower ends of the middle tube, a deformable film sleeve is sleeved on the upper end of the visible sheet, a pre-breaking comb is fixedly connected between the deformable film sleeve and the visible sheet, a plurality of evenly distributed overflow balls are fixedly connected to the outer end of the deformable film sleeve, an isolation cover is fixedly connected to the inner end of the middle tube, and the isolation cover covers the outside of the overflow ball, an elastic oil bag is fixedly connected to the lower end of the heat conductive sheet, and the elastic oil bag is filled with heat-conducting oil, and a plurality of evenly distributed magnetic suction columns are inlaid and connected in the elastic oil bag.

[0009] Furthermore, the middle tube is made of a breathable material to form a hollow cylindrical structure, the heat conducting sheet is made of a heat conducting material, and the visible sheet is made of a transparent material.

[0010] Furthermore, the isolation cover includes multiple groups of thermal insulation sheets, adhesive strips and hygroscopic beams, the thermal insulation sheets together constitute a sheet structure, and the adhesive strips are inlaid and connected between the thermal insulation sheets, one end of the hygroscopic beam is connected to the outer hygroscopic beam, and the other end extends to the inside of the adhesive strip, and the thermal insulation sheets are connected as a whole through the adhesive strip, which can not only isolate the heat of the elastic oil bag, but also prevent the overflow ball from approaching the elastic oil bag. After the adhesive strip is dissolved by the moisture conduction effect of the hygroscopic beam, the thermal insulation sheet that loses the adhesive effect of the adhesive strip can no longer block the overflow ball. The overflow ball can actively approach and contact the elastic oil bag under the magnetic effect of the magnetic column, thereby triggering the overflow action.

[0011] Furthermore, the heat insulation sheet is made of heat insulation material, the adhesive strip is made of water-soluble material, and the moisture absorbing beam is made of moisture conductive material.

[0012] Furthermore, the overflow ball is a hollow spherical structure made of a lightweight heat-conductive material, and a plurality of overflow micropores are provided on the overflow ball. The overflow ball is filled with magnetic powder and ammonium bicarbonate powder. The overflow ball has a low weight and is easy to move close to the elastic oil bag under the action of magnetic attraction. The ammonium bicarbonate powder will accelerate the decomposition rate when heated, thereby generating a large amount of gas and overflowing, thereby squeezing out the moisture inside.

[0013] Furthermore, the pre-breaking comb includes a color-changing layer, a plurality of pre-breaking strips and a plurality of moisture-conducting bundles. The color-changing layer is fixedly connected to the upper end of the visual sheet, and the pre-breaking strips and the moisture-conducting bundles are fixedly connected between the overflow ball and the color-changing layer. When the overflow ball is moved by the magnetic attraction force, the pre-breaking strips will be pulled, thereby causing the pre-breaking strips to break. After the colored aqueous solution inside flows out, it will be absorbed by the moisture-conducting bundles and changed color on the color-changing layer, so that an intuitive warning can be given through the visual sheet.

[0014] Furthermore, the color-changing layer is made of light-colored or white hygroscopic material, the pre-breaking strip is made of non-elastic material and has an easy-to-break line at the center, the pre-breaking strip is filled with a colored aqueous solution, and the moisture-conducting bundle is made of elastic moisture-conducting material.

[0015] Furthermore, the magnetic column includes a support column, a magnetic block and a stop column from top to bottom, and the distance between the magnetic columns is greater than the diameter of the overflow ball. The support column supports the magnetic block and is not easy to interfere with the elastic oil bag's absorption of heat when the PCB board body is working. The stop column limits the overflow ball to avoid the situation where the overflow ball and the magnetic block are attached to each other due to excessive deformation of the elastic oil bag, affecting heat conduction, so that heat can be absorbed in time and the overflow action can be triggered.

[0016] Furthermore, the support column is made of a hard heat-conducting material, the magnetic attraction block is made of a magnetic material, and the stop column is made of an elastic heat-conducting material.

[0017] Furthermore, the external hygroscopic bundle includes a hygroscopic main bundle, a plurality of dispersed threads and a plurality of color-changing silica gels. The color-changing silica gels are connected to the periphery of the hygroscopic main bundle through the dispersed threads, and the dispersed threads have different lengths. The hygroscopic capacity of the color-changing silica gel can not only assist in absorbing moisture, but also change color itself to provide certain prompts. Due to the presence of the color-changing silica gel, when there is less moisture, the color-changing silica gel can absorb it and will not trigger the action in the visual film.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the advantages of the present invention are:

[0020] (1) This solution can meet the heat dissipation requirements of the PCB board body by setting up a heat dissipation frame, and at the same time use the exhaust pipe to provide isolation support. The external moisture absorption beam can timely sense the humidity of the external air. When there is a lot of moisture, the moisture will be absorbed by the external moisture absorption beam and transported to the isolation cover inside the exhaust pipe, causing the isolation cover to partially dissolve, thereby no longer blocking the overflow ball. At this time, the overflow ball can actively approach and contact the elastic oil bag under the magnetic attraction of the magnetic column, and change from the original heat insulation state to the heat conduction state. The overflow ball will overflow when heated and release it to the outside through the exhaust pipe, squeezing out the moisture in the space between the PCB board body and the heat dissipation frame, improving the moisture invasion. At the same time, the color change of the pre-break comb can be used to warn the outside world, so that timely measures can be taken to prevent the PCB board body from being damaged by moisture.

[0021] (2) The isolation cover includes multiple groups of thermal insulation sheets, adhesive strips and moisture absorption beams. The thermal insulation sheets together form a sheet structure, and the adhesive strips are embedded and connected between the thermal insulation sheets. One end of the moisture absorption beam is connected to the outer moisture absorption beam, and the other end extends to the inner side of the adhesive strip. The thermal insulation sheets are connected as a whole through the adhesive strip, which can not only isolate the heat of the elastic oil bag, but also prevent the overflow ball from approaching the elastic oil bag. After the adhesive strip is dissolved by the moisture conduction effect of the moisture absorption beam, the thermal insulation sheet that loses the adhesive effect of the adhesive strip can no longer block the overflow ball. The overflow ball can actively approach and contact the elastic oil bag under the magnetic effect of the magnetic column, thereby triggering the overflow action.

[0022] (3) The overflow ball is a hollow spherical structure made of a lightweight thermal conductive material, and a plurality of overflow micropores are opened on the overflow ball. The overflow ball is filled with magnetic powder and ammonium bicarbonate powder. The overflow ball is light in weight and can be easily moved close to the elastic oil bag under the action of magnetic attraction. The ammonium bicarbonate powder will accelerate the decomposition rate when heated, thereby generating a large amount of gas and overflowing, thereby squeezing out the moisture inside.

[0023] (4) The pre-break comb includes a color-changing layer, a plurality of pre-break strips and a plurality of moisture-conducting bundles. The color-changing layer is fixedly connected to the upper end of the visual sheet. The pre-break strips and the moisture-conducting bundles are fixedly connected between the overflow ball and the color-changing layer. When the overflow ball is moved by the magnetic attraction, the pre-break strips will be pulled, thereby causing the pre-break strips to break. After the colored aqueous solution inside flows out, it will be absorbed by the moisture-conducting bundles to the color-changing layer and change color, so that an intuitive warning can be given through the visual sheet.

[0024] (5) The magnetic column includes a support column, a magnetic block and a stop column from top to bottom, and the distance between the magnetic columns is greater than the diameter of the overflow ball. The support column supports the magnetic block and is not easy to interfere with the elastic oil bag's absorption of heat when the PCB board body is working. The stop column limits the overflow ball to avoid the situation where the overflow ball and the magnetic block are attached to each other due to excessive deformation of the elastic oil bag, which affects the heat conduction, so that heat can be absorbed in time and the overflow action can be triggered.

[0025] (6) The external hygroscopic bundle includes a main hygroscopic bundle, a plurality of dispersed threads and a plurality of color-changing silica gels. The color-changing silica gels are connected to the main hygroscopic bundle through the dispersed threads, and the lengths of the dispersed threads are different. The hygroscopic capacity of the color-changing silica gel can not only assist in absorbing moisture, but also change color to provide certain prompts. Due to the presence of the color-changing silica gel, when there is less moisture, the color-changing silica gel can absorb it and will not trigger the action in the visual film. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the present invention when it is working;

[0028] Figure 3 It is a schematic diagram of the structure of the exhaust pipe of the present invention;

[0029] Figure 4 for Figure 3 The structural diagram at A in the middle;

[0030] Figure 5 It is a schematic diagram of the structure of the pre-breaking comb of the present invention before and after it is broken;

[0031] Figure 6 It is a structural schematic diagram of the overflow ball of the present invention;

[0032] Figure 7 It is a structural schematic diagram of the magnetic column of the present invention;

[0033] Figure 8 It is a schematic diagram of dyeing the outer moisture absorption bundle of the present invention.

[0034] Description of the numbers in the figure:

[0035] 1PCB board body, 2 heat dissipation frame, 3 exhaust pipe, 31 middle pipe, 32 thermal conductive sheet, 33 visible sheet, 4 outer moisture absorption bundle, 41 moisture absorption main bundle, 42 dispersion wire, 43 color-changing silica gel, 5 deformable film sleeve, 6 isolation cover, 61 thermal insulation sheet, 62 adhesive strip, 63 moisture absorption sub-beam, 7 elastic oil bag, 8 magnetic column, 81 support column, 82 magnetic block, 83 stop column, 9 overflow ball, 10 pre-breaking comb, 101 color-changing layer, 102 pre-breaking strip, 103 moisture conduction bundle. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "mounted / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1:

[0040] See also Figure 1-3 A PCB board structure with moisture-proof performance comprises a PCB board body 1, a matching heat dissipation frame 2 is provided on one side of the PCB board body 1, a plurality of evenly distributed exhaust pipes 3 are fixedly connected between the PCB board body 1 and the heat dissipation frame 2, and the exhaust pipes 3 are distributed around the edge, and an external moisture absorption beam 4 extending to the outside is inlaid and connected on the exhaust pipe 3, the exhaust pipe 3 comprises a middle tube 31, a heat conductive sheet 32 ​​and a visible sheet 33, the heat conductive sheet 32 ​​and the visible sheet 33 are respectively connected to the upper and lower ends of the middle tube 31, a deformable film sleeve 5 is sleeved on the upper end of the visible sheet 33, a pre-breaking comb 10 is fixedly connected between the deformable film sleeve 5 and the visible sheet 33, a plurality of evenly distributed overflow balls 9 are fixedly connected to the outer end of the deformable film sleeve 5, an isolation cover 6 is fixedly connected to the inner end of the middle tube 31, and the isolation cover 6 covers the outside of the overflow ball 9, an elastic oil bag 7 is fixedly connected to the lower end of the heat conductive sheet 32, and the elastic oil bag 7 is filled with heat-conducting oil, and a plurality of evenly distributed magnetic suction columns 8 are inlaid and connected in the elastic oil bag 7.

[0041] The middle tube 31 is made of a breathable material to form a hollow cylindrical structure, the heat conducting sheet 32 ​​is made of a heat conducting material, and the visible sheet 33 is made of a transparent material.

[0042] See also Figure 4 The isolation cover 6 includes multiple groups of heat-insulating sheets 61, adhesive strips 62 and hygroscopic beams 63. The heat-insulating sheets 61 together constitute a sheet structure, and the adhesive strips 62 are embedded and connected between the heat-insulating sheets 61. One end of the hygroscopic beam 63 is connected to the outer hygroscopic beam 4, and the other end extends to the inner side of the adhesive strip 62. The heat-insulating sheets 61 are connected as a whole through the adhesive strip 62, which can not only isolate the heat of the elastic oil bag 7, but also prevent the overflow ball 9 from approaching the elastic oil bag 7. After the adhesive strip 62 is dissolved by the moisture-conducting effect of the hygroscopic beam 63, the heat-insulating sheet 61 that loses the adhesive effect of the adhesive strip 62 can no longer block the overflow ball 9. The overflow ball 9 can actively approach and contact the elastic oil bag 7 under the magnetic effect of the magnetic column 8, thereby triggering the overflow action.

[0043] The heat insulating sheet 61 is made of a heat insulating material, the adhesive strip 62 is made of a water-soluble material, and the moisture absorbing beam 63 is made of a moisture conductive material.

[0044] See also Figure 6 The overflow ball 9 is a hollow spherical structure made of a lightweight heat-conductive material, and a plurality of overflow micropores are provided on the overflow ball 9. The overflow ball 9 is filled with magnetic powder and ammonium bicarbonate powder. The overflow ball 9 has a low weight and is easy to move close to the elastic oil bag 7 under the action of magnetic attraction. The ammonium bicarbonate powder will accelerate the decomposition rate when heated, thereby generating a large amount of gas and overflowing, thereby squeezing out the moisture inside.

[0045] See also Figure 5 The pre-break comb 10 includes a color-changing layer 101, a plurality of pre-break strips 102 and a plurality of moisture-conducting bundles 103. The color-changing layer 101 is fixedly connected to the upper end of the visual sheet 33. The pre-break strips 102 and the moisture-conducting bundles 103 are fixedly connected between the overflow ball 9 and the color-changing layer 101. When the overflow ball 9 moves under the action of the magnetic attraction force, the pre-break strips 102 will be pulled, thereby causing the pre-break strips 102 to break. After the colored aqueous solution inside flows out, it will be absorbed by the moisture-conducting bundles 103 and is changed color on the color-changing layer 101, so that an intuitive warning can be given through the visual sheet 33.

[0046] The color-changing layer 101 is made of a light-colored or white hygroscopic material, the pre-breaking strip 102 is made of a non-elastic material and a break line is arranged at the center. The pre-breaking strip 102 has a low tear strength and is easily broken when pulled due to the setting of the break line. The pre-breaking strip 102 is filled with a colored aqueous solution, and the moisture-conducting bundle 103 is made of an elastic moisture-conducting material.

[0047] See also Figure 7The magnetic column 8 includes a support column 81, a magnetic block 82 and a stop column 83 from top to bottom, and the distance between the magnetic columns 8 is greater than the diameter of the overflow ball 9. The support column 81 supports the magnetic block 82 and is not easy to interfere with the elastic oil bag 7 absorbing heat when the PCB board body 1 is working. The stop column 83 limits the overflow ball 9 to avoid the situation where the overflow ball 9 and the magnetic block 82 are attached to each other due to excessive deformation of the elastic oil bag 7, which affects the heat conduction, so that heat can be absorbed in time and the overflow action can be triggered.

[0048] The support column 81 is made of a hard heat-conducting material, the magnetic attraction block 82 is made of a magnetic material, and the stop column 83 is made of an elastic heat-conducting material.

[0049] See also Figure 8 The external hygroscopic bundle 4 includes a hygroscopic main bundle 41, a plurality of dispersed threads 42 and a plurality of color-changing silica gels 43. The color-changing silica gels 43 are connected to the periphery of the hygroscopic main bundle 41 through the dispersed threads 42, and the dispersed threads 42 have different lengths. The hygroscopic capacity of the color-changing silica gel 43 can not only assist in absorbing moisture, but also change color to provide certain prompts. Due to the existence of the color-changing silica gel 43, when there is less moisture, the color-changing silica gel 43 can absorb it and will not trigger the action in the visual sheet 33.

[0050] The present invention can meet the heat dissipation demand of the PCB board body 1 by setting a heat dissipation frame 2, and at the same time use the exhaust pipe 3 to provide isolation support, the external moisture absorption beam 4 can timely sense the external air humidity, when the moisture is high, the moisture will be absorbed by the external moisture absorption beam 4 and transported to the isolation cover 6 on the inner side of the exhaust pipe 3, so that the isolation cover 6 is partially dissolved, so that the overflow ball 9 is no longer blocked. At this time, the overflow ball 9 can actively approach and contact the elastic oil bag 7 under the magnetic attraction of the magnetic column 8, and change from the original heat insulation state to the heat conduction state, and the overflow ball 9 will overflow in the heated state, and release it to the outside through the exhaust pipe 3, squeeze out the moisture in the space between the PCB board body 1 and the heat dissipation frame 2, improve the moisture invasion, and at the same time warn the outside world through the color change of the pre-breaking comb 10, so that timely measures can be taken to prevent the PCB board body 1 from being damaged by moisture.

[0051] The above are only preferred specific implementations of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and improved concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PCB structure with moisture-proof performance, comprising a PCB body (1), characterized in that: A matching heat dissipation frame (2) is provided on one side of the PCB body (1); a plurality of evenly distributed exhaust pipes (3) are fixedly connected between the PCB body (1) and the heat dissipation frame (2); the exhaust pipes (3) are distributed around the edge; an external moisture absorption beam (4) extending to the outside is embedded and connected to the exhaust pipe (3); the exhaust pipe (3) comprises a middle pipe (31), a heat conducting sheet (32) and a visible sheet (33); the heat conducting sheet (32) and the visible sheet (33) are respectively connected to the upper and lower ends of the middle pipe (31); the upper end of the visible sheet (33) is A deformable film sleeve (5) is sleeved, a pre-break comb (10) is fixedly connected between the deformable film sleeve (5) and the visual sheet (33), a plurality of evenly distributed overflow balls (9) are fixedly connected to the outer end of the deformable film sleeve (5), an isolation cover (6) is fixedly connected to the inner end of the middle tube (31), and the isolation cover (6) covers the outer side of the overflow ball (9), an elastic oil bag (7) is fixedly connected to the lower end of the heat conducting sheet (32), and the elastic oil bag (7) is filled with heat conducting oil, and a plurality of evenly distributed magnetic suction columns (8) are embedded and connected in the elastic oil bag (7); The isolation cover (6) comprises a plurality of groups of heat-insulating sheets (61), adhesive strips (62) and hygroscopic beams (63); the heat-insulating sheets (61) together form a sheet-like structure, and the adhesive strips (62) are embedded and connected between the heat-insulating sheets (61); one end of the hygroscopic beam (63) is connected to the outer hygroscopic beam (4), and the other end extends to the inner side of the adhesive strip (62); the heat-insulating sheets (61) are connected as a whole through the adhesive strip (62); the adhesive strip (62) is dissolved after being subjected to the moisture-conducting effect of the hygroscopic beam (63); and the overflow ball (9) is filled with magnetic powder and ammonium bicarbonate powder.

2. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The middle tube (31) is made of a breathable material to form a hollow cylindrical structure, the heat conducting sheet (32) is made of a heat conducting material, and the visible sheet (33) is made of a transparent material.

3. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The heat insulation sheet (61) is made of a heat insulation material, the adhesive strip (62) is made of a water-soluble material, and the moisture absorbing beam (63) is made of a moisture conductive material.

4. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The overflow ball (9) is a hollow spherical structure made of a light heat-conducting material, and a plurality of overflow micropores are provided on the overflow ball (9).

5. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The pre-breaking comb (10) comprises a color-changing layer (101), a plurality of pre-breaking strips (102) and a plurality of moisture-conducting bundles (103); the color-changing layer (101) is fixedly connected to the upper end of the visual sheet (33); and the pre-breaking strips (102) and the moisture-conducting bundles (103) are both fixedly connected between the overflow ball (9) and the color-changing layer (101).

6. The PCB structure with moisture-proof performance according to claim 5, characterized in that: The color-changing layer (101) is made of a light-colored or white hygroscopic material, the pre-breaking strip (102) is made of a non-elastic material and is provided with an easy-to-break line at the center, the pre-breaking strip (102) is filled with a colored aqueous solution, and the moisture-conducting bundle (103) is made of an elastic moisture-conducting material.

7. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The magnetic column (8) comprises, from top to bottom, a support column (81), a magnetic block (82) and a stop column (83), and the distance between the magnetic columns (8) is greater than the diameter of the overflow ball (9).

8. The PCB structure with moisture-proof performance according to claim 7, characterized in that: The support column (81) is made of a hard heat-conducting material, the magnetic attraction block (82) is made of a magnetic material, and the stop column (83) is made of an elastic heat-conducting material.

9. The PCB structure with moisture-proof performance according to claim 1, characterized in that: The external hygroscopic bundle (4) comprises a main hygroscopic bundle (41), a plurality of dispersed threads (42) and a plurality of color-changing silica gels (43). The color-changing silica gels (43) are connected to the main hygroscopic bundle (41) through the dispersed threads (42), and the dispersed threads (42) have different lengths.

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