A power diode device

Abstract

The present invention relates to the technical field of diodes, and in particular provides a power diode device, including a body. A first cover is sleeved on the upper section of the body, and a second cover is sleeved on the lower section of the body. There is an activity space between the opposite ends of the first cover and the second cover. Pressing rings are fixed on the opposite ends of the first cover and the second cover. A thin spring located in the activity space is elastically connected between the two pressing rings. The thin spring is sleeved on the periphery of the body. When the first cover and the second cover move in opposite directions, the thin spring is pressed to compress and shorten in the activity space, and the two pressing rings are used to push the first cover and the second cover to move in the reverse direction to implement fire extinguishing or flame retardancy for the heat source range on the PCB board. These inert substances block between the bottom end of the body and the top surface of the PCB board, and when high heat is generated on the PCB board, it thus plays a very good protective role for the diode.

Description

Technical Field

[0001] The present invention relates to the technical field of diodes, and particularly to a power diode device. Background Art

[0002] A high-power diode is composed of a body and positive and negative terminal pins connected to both ends thereof, and only allows current to flow in a single direction. Connecting the positive and negative pins of multiple diodes together has a rectifying function, which is commonly known as a rectifier bridge. In most cases, high-power diodes are used independently and can be applied in high-power environments.

[0003] When a high-power diode is used on a PCB board, it will generate relatively high heat. In addition, if a certain component in the PCB circuit fails, due to the circuit connection relationship, the heat of the diode will rise sharply. The power diode lacks a cooling and automatic protection function, which affects its service life. Therefore, this defect needs to be improved. Summary of the Invention

[0004] In order to solve the above problems and improve the service life of the power diode, the present invention provides a power diode device, including a body. A first cover is sleeved on the upper section of the body, and a second cover is sleeved on the lower section of the body. There is an activity space between the opposite ends of the first cover and the second cover. Pressing rings are fixed on the opposite ends of the first cover and the second cover. A thin spring located in the activity space is elastically connected between the two pressing rings. The thin spring is sleeved on the periphery of the body. When the first cover and the second cover move in opposite directions, they press the thin spring to compress and shorten in the activity space. When the two ends of the thin spring elastically elongate, the two pressing rings are used to push the first cover and the second cover to move in the opposite direction;

[0005] The first pole pin penetrates upward through the first cover, and the second pole pin penetrates downward through the second cover. When the first cover moves upward, it also moves upward along the first pole pin. When the second cover moves downward, it also moves downward along the second pole pin;

[0006] An inner cavity is provided in the second cover. The lower section of the body penetrates through the inner cavity. A clamping cavity is formed between the inner cavity and the outer wall of the second cover. The clamping cavity is filled with an inert medium. A discharge hole is opened at the bottom end of the second cover, and the discharge hole communicates with the clamping cavity. The discharge hole is filled with a plastic plug. When the plastic plug moves downward with the second cover and approaches the PCB board, when the plastic plug plastically deforms, the inert medium in the clamping cavity is discharged from the discharge hole onto the PCB board;

[0007] An expanding agent is filled between the bottom of the inner cavity of the second cover and the bottom end of the body. The length of the first pole pin is greater than the length of the second pole pin.

[0008] As a further preference, two copper sheets are fixed on the bottom surface of the second cover. The two copper sheets are symmetrically arranged on both sides of the second pole pin, and the two copper sheets extend along both sides of the second pole pin to the bottom end of the second pole pin.

[0009] As a further preference, the discharge hole is opened at a side position of the second cover. The top ends of the two copper sheets are connected to the side position of the bottom surface of the second cover and are symmetrically arranged on both sides of the plastic plug.

[0010] As a further preference, the copper sheet is an arc-shaped thin plate that gradually bends from one side of the second pole pin to the other side of the second pole pin.

[0011] When the bottom end of the second pole pin is spot-welded to the PCB board, the bottom ends of the two copper sheets elastically abut against the PCB board. When the second cover moves downward, the two copper sheets are pushed to abut against the PCB board and continue to bend downward.

[0012] As a further preference, the two copper sheets are inclined with respect to the direction of the second pole pin.

[0013] As a further preference, a connecting piece is connected between the two copper sheets and is close to the lower part of the plastic plug. A tight hole is opened in the middle of the plastic plug. When the connecting piece moves upward as the two copper sheets bend upward and gradually approaches the tight hole, and the surface of the connecting piece is provided with a cone-shaped cover. When the connecting piece bends upward with the two copper sheets and gradually approaches the tight hole, it can penetrate into the tight hole to expand and open the tight hole.

[0014] The cone-shaped cover is a conical cover that gradually tapers from bottom to top, and the top end and the bottom end of the cone-shaped cover are communicated.

[0015] As a further preference, a through hole is opened on the connecting piece, and the bottom end of the cone-shaped cover is connected to the through hole, and the bottom opening of the cone-shaped cover is vertically communicated with the through hole.

[0016] As a further preference, bite openings are opened on both side edges of the two copper sheets. The parts where the connecting piece is connected to the two copper sheets are close to the bite openings. When the two copper sheets continue to bend due to the bottom ends abutting against the PCB board, the top parts bend and deform with the bite openings as the deformation parts, and while bending and deforming at the bite opening parts, the connecting piece drives the cone-shaped cover to penetrate into the tight hole of the plastic plug.

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] 1. When the heat on the PCB board reaches the expansion coefficient of the expander, a strong expansion effect will be generated by this part of the expander. The expansion effect releases a driving force downward and acts on the second cover with this thrust, pushing the second cover to descend along the body. While the body descends, it also provides a thrust to the plastic plug, and the descending action of the body drives the plastic plug closer to the PCB board. The high-temperature heat on the PCB board will then be transferred to the plastic plug at a close distance. As the temperature of the plastic plug continues to rise, the plastic plug will undergo plastic deformation. Since the shape of the plastic deformation of the plastic plug is irregular when it undergoes plastic deformation, it will cause the plastic plug to become loose from the discharge hole. Since the discharge hole is opened at the bottom of the clamping cavity and an inert medium is filled in the clamping cavity, for example, when the inert medium is an inert gas mixed with a flame retardant powder, it has a pressure due to being compressed in the clamping cavity. When the plastic plug becomes loose due to plastic deformation, the high-pressure inert medium first knocks off the plastic plug, and then is quickly ejected onto the PCB board through the discharge hole to extinguish the fire or retard the flame for the heat source range on the PCB board. These inert substances block between the bottom end of the body and the top surface of the PCB board, and when high heat is generated on the PCB board, it thus plays a very good protective role for the diode.

[0019] 2. When the copper sheet bends upward as the second cover descends, the connecting piece will deflect upward accordingly and gradually bring the conical thorn cover closer to the plastic plug. When the conical thorn cover leans against the plastic plug, it will gradually insert the top tip of the conical thorn cover into the tight hole of the plastic plug in such a way that the tight hole is enlarged, which will make the clamping cavity corresponding above the tight hole communicate with the copper sheet through the tight hole. At this time, the inert medium in the clamping cavity will flow into the conical thorn cover through the tight hole, then be discharged into the through hole through the conical thorn cover, and then be discharged onto the PCB board through the through hole. At this time, even if the heat on the PCB board is not sufficient to cause the plastic plug to undergo plastic deformation, even if the plastic plug does not undergo plastic deformation and falls off from the discharge hole, it is still possible, under the descending action of the second cover, to use the bending of the copper sheet to pierce the conical thorn cover into the plastic plug, so that the inert medium falls on the PCB board to exert its flame retardant function, and it can also improve the service life of the diode. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A plan view of a power diode device provided by an embodiment of the present invention;

[0021] Figure 2 A power diode device provided by an embodiment of the present invention is composed of Figure 1 The schematic diagram under the rotating perspective drawn out;

[0022] Figure 3 A schematic diagram of a power diode device provided by an embodiment of the present invention under the bottom partial perspective;

[0023] Figure 4A schematic plan view after the power diode device provided by the embodiment of the present invention is dissected;

[0024] Figure 5 A schematic internal structure view after the power diode device provided by the embodiment of the present invention is dissected from a partial perspective.

[0025] In the figure: 1, body; 2, first cover; 3, second cover; 4, activity space; 5, pressure ring; 6, thin spring; 7, inner cavity; 8, clamping cavity; 9, inert medium; 10, discharge hole; 11, plastic plug; 12, copper sheet; 13, connecting piece; 14, tight hole; 15, conical thorn cover; 16, through hole; 17, bite. Specific embodiments

[0026] The following will clearly and completely describe the above and other embodiments and advantages of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only partial embodiments of the present invention, rather than all embodiments.

[0027] In one embodiment, as Figures 1 - 5 shown:

[0028] This embodiment provides a power diode device, including a body 1. A first cover 2 is sleeved on the upper section of the body 1, and a second cover 3 is sleeved on the lower section of the body 1. An activity space 4 is provided between the opposite ends of the first cover 2 and the second cover 3. Pressure rings 5 are fixed on the opposite ends of the first cover 2 and the second cover 3. A thin spring 6 located in the activity space 4 is elastically connected between the two pressure rings 5. The thin spring 6 is sleeved on the periphery of the body 1. The thin spring 6 can be a plastic spring, etc. When the first cover 2 and the second cover 3 move in opposite directions, the thin spring 6 is compressed and shortened in the activity space 4. When the two ends of the thin spring 6 elastically elongate, the two pressure rings 5 are used to push the first cover 2 and the second cover 3 to move in the opposite direction;

[0029] The first pole pin penetrates upward through the first cover 2, and the second pole pin penetrates downward through the second cover 3. When the first cover 2 moves upward, it also moves upward along the first pole pin. When the second cover 3 moves downward, it also moves downward along the second pole pin;

[0030] An inner cavity 7 is provided in the second cover 3. The lower section of the body 1 penetrates through the inner cavity 7. A clamping cavity 8 is formed between the inner cavity 7 and the outer wall of the second cover 3. The clamping cavity 8 is filled with an inert medium 9. A discharge hole 10 is opened at the bottom end of the second cover 3. The discharge hole 10 communicates with the clamping cavity 8. The discharge hole 10 is filled with a plastic plug 11. When the plastic plug 11 moves downward with the second cover 3 and approaches the PCB board, when the plastic plug 11 plastically deforms, the inert medium 9 in the clamping cavity 8 is discharged from the discharge hole 10 onto the PCB board;

[0031] An expander is filled between the bottom of the inner cavity of the second cover 3 and the bottom end of the body 1, and an expander is filled between the top of the inner cavity of the first cover 2 and the top end of the body 1. The length of the first pole pin is greater than that of the second pole pin.

[0032] When the diode is actually used, the first pole pin is bent downward along the side of the body 1 and then welded to the PCB board, and the bottom end of the second pole pin is directly welded to the PCB board. The second cover 3 is located on the bottom side, and the first cover 2 is located on the upper side. When a large current is transmitted to the two pins due to a PCB board circuit or component failure, higher heat will be transferred to the first cover 2 and the second cover 3 in a short time. Under the protection of the first cover 2 and the second cover 3, the higher heat can make the body 1 have a certain heat insulation effect, improving the heat resistance performance of the body 1. As the heat on the PCB board becomes higher and higher, especially when high heat is transferred to the second cover 3 at close range, it is transferred to the expander at the bottom of the inner cavity of the second cover 3 through the second cover 3. When the heat reaches the expansion coefficient of the expander, this part of the expander will produce a strong expansion effect. The expansion effect releases a downward driving force and acts on the second cover 3 with this thrust, pushing the second cover 3 to descend along the body 1. While the body 1 descends, it also provides a thrust to the plastic plug 11, and the descending movement of the body 1 drives the plastic plug 11 to approach the PCB board. At this time, the high-temperature heat on the PCB board will be transferred to the plastic plug 11 at close range. As the temperature on the plastic plug 11 continues to rise, the plastic plug 11 will undergo plastic deformation. Since the shape of the plastic deformation of the plastic plug 11 is irregular when it undergoes plastic deformation, the tightness between the plastic plug 11 and the discharge hole 10 will become smaller (loose). Since the discharge hole 10 is opened at the bottom of the clamping cavity 8 and an inert medium 9 is filled in the clamping cavity 8, for example, when the inert medium 9 is an inert gas mixed with a flame retardant powder, it has a pressure due to being compressed in the clamping cavity 8. When the plastic plug 11 becomes loose due to plastic deformation, the high-pressure inert medium 9 first knocks off the plastic plug 11, and then is quickly sprayed onto the PCB board through the discharge hole 10 to extinguish or retard the fire for the heat source range on the PCB board. These inert substances block between the bottom end of the body 1 and the top surface of the PCB board, and when high heat is generated on the PCB board, it thus plays a very good protective role for the body 1 (diode).

[0033] Such as Figures 3 to 5As shown, two copper sheets 12 are fixed on the bottom surface of the second cover 3. The two copper sheets 12 are symmetrically arranged on both sides of the second pole pin. The copper sheet 12 is an arc-shaped thin plate that gradually bends from one side of the second pole pin to the other side. The two copper sheets 12 extend along both sides of the second pole pin to the bottom end of the second pole pin. The bottom ends of the two copper sheets 12 abut against the PCB board. When the second cover 3 descends, it drives the two copper sheets 12 to descend. The two copper sheets 12 will gradually bend downward because their bottom ends abut against the PCB board. Under the supporting action of the two copper sheets 12, the second cover 3 is prevented from completely falling onto the PCB board. Also, since the discharge hole 10 is opened at a side position of the second cover 3, and the top ends of the two copper sheets 12 are connected to the side position of the bottom surface of the second cover 3, and the two copper sheets 12 are symmetrically arranged on both sides of the plastic plug 11, and the two copper sheets 12 are inclined with respect to the direction of the second pole pin. Therefore, when the discharge hole 10 is opened, in addition to most of the inert medium 9 directly falling onto the PCB board, a part of the inert medium 9 also falls onto the two copper sheets 12 and is distributed to the second pole pin along the arc-shaped trend and inclined pattern of the two copper sheets 12, directly blocking the heat source on the second pole pin and also being able to retard the fire area that may occur within the range of the second pole pin on the PCB board.

[0034] In another embodiment, as Figures 2 to 5 shown, a connecting piece 13 is connected between the two copper sheets 12 and is close to the lower part of the plastic plug 11. A tight hole 14 is opened in the middle of the plastic plug 11. When the connecting piece 13 moves upward as the two copper sheets 12 bend upward and gradually approaches the tight hole 14, a conical thorn cover 15 is provided on the surface of the connecting piece 13. When the connecting piece 13 bends upward with the two copper sheets 12 and gradually approaches the tight hole 14, it can penetrate into the tight hole 14 to expand and open the tight hole 14;

[0035] The conical thorn cover 15 is a conical cover that gradually tapers from bottom to top, and the top end and the bottom end of the conical thorn cover 15 are communicated. A through hole 16 is opened on the connecting piece 13, and the bottom end of the conical thorn cover 15 is connected to the through hole 16, and the bottom end opening of the conical thorn cover 15 is vertically communicated with the through hole 16.

[0036] When the two copper sheets 12 bend upward as the second cover 3 descends, the connecting piece 13 will deflect upward accordingly, and drive the conical spike cover 15 to gradually approach the plastic plug 11. When the conical spike cover 15 abuts against the plastic plug 11, the conical spike cover 15 will gradually insert its tip into the tight hole 14 of the plastic plug 11 in such a way as to expand the tight hole 14. This will enable the clamping cavity 8 corresponding above the tight hole 14 to communicate with the copper sheet 12 through the tight hole 14. At this time, the inert medium 9 in the clamping cavity 8 will flow into the conical spike cover 15 through the tight hole 14, then be discharged into the through hole 16 through the conical spike cover 15, and then be discharged onto the PCB board through the through hole 16. At this time, even if the heat on the PCB board is not sufficient to cause plastic deformation of the plastic plug 11, and even if the plastic plug 11 does not undergo plastic deformation and fall off from the discharge hole 10, under the downward movement of the second cover 3, the copper sheet 12 can be bent to drive the conical spike cover 15 to pierce into the plastic plug 11, so that the inert medium 9 can fall onto the PCB board to play its flame retardant function, and the service life of the diode can also be extended.

[0037] Bite openings 17 are provided on both side edges of the two copper sheets 12. The parts where the connecting piece 13 is connected to the two copper sheets 12 are close to the bite openings 17. When the two copper sheets 12 continue to bend with their bottoms abutting against the PCB board, the top parts bend and deform with the bite openings 17 as the deformation parts. While bending and deforming at the bite opening 17 parts, the conical spike cover 15 is driven by the connecting piece 13 to pierce into the tight hole 14 of the plastic plug 11. The provision of the bite openings 17 makes it easier for the two copper sheets 12 to bend at the bite opening 17 parts when bending. In a short time, the two copper sheets 12 drive the connecting piece 13 to deflect upward, and through the upward deflection action of the connecting piece 13 in a short time, the conical spike cover 15 is inserted into the plastic plug 11 through the tip of the top spike part, and in a short time, the inert medium 9 in the second cover 3 is discharged onto the PCB board. That is, when the PCB board has a high heat phenomenon, the time for the inert medium 9 to be discharged onto the PCB board is shortened, enabling the diode to trigger the above mechanism action in a short time, and further extending the service life of the diode.

[0038] The above orientation references do not represent the specific orientations of the components in this implementation scheme. This implementation scheme is only for the convenience of describing the scheme and is set with relative descriptions referring to the orientations in the figure. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0039] The above specific implementation manners have further elaborated on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above is only the specific implementation manner of the present invention and is not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A power diode device, characterized in that: The invention comprises a body (1), wherein a first cover (2) is sleeved on the upper section of the body (1), and a second cover (3) is sleeved on the lower section of the body (1); an activity space (4) is provided between the opposite ends of the first cover (2) and the second cover (3); a pressure ring (5) is fixed on the opposite ends of the first cover (2) and the second cover (3); a thin spring (6) located in the activity space (4) is elastically connected between the two pressure rings (5); the thin spring (6) is sleeved on the outer periphery of the body (1); when the first cover (2) and the second cover (3) move in relative directions, the thin spring (6) is compressed and shortened in the activity space (4); when the two ends of the thin spring (6) elastically lengthen, the two pressure rings (5) are used to push the first cover (2) and the second cover (3) to move in opposite directions; The first pole pin passes through the first cover (2) upwards, and the second pole pin passes through the second cover (3) downwards; when the first cover (2) moves upwards, it also moves upwards along the first pole pin, and when the second cover (3) moves downwards, it also moves downwards along the second pole pin; An inner cavity (7) is provided in the second cover (3), the lower section of the body (1) passes through the inner cavity (7), a sandwich cavity (8) is formed between the inner cavity (7) and the outer wall of the second cover (3), the sandwich cavity (8) is filled with an inert medium (9), a discharge hole (10) is provided at the bottom end of the second cover (3), the discharge hole (10) is communicated with the sandwich cavity (8), a plastic plug (11) is filled in the discharge hole (10), when the plastic plug (11) moves downward with the second cover (3), it approaches the PCB board, when the plastic plug (11) is plastically deformed, the inert medium (9) in the sandwich cavity (8) is discharged from the discharge hole (10) onto the PCB board; An expansion agent is filled between the bottom of the inner cavity of the second cover (3) and the bottom end of the body (1), and the length of the first pole pin is greater than the length of the second pole pin.

2. A power diode device according to claim 1, characterized in that: Two copper sheets (12) are fixed on the bottom surface of the second cover (3), the two copper sheets (12) are symmetrically arranged on both sides of the second pole pin, and the two copper sheets (12) extend along both sides of the second pole pin to the bottom end of the second pole pin.

3. A power diode device according to claim 2, characterized in that: The discharge hole (10) is opened at a side position of the second cover (3), and the top ends of the two copper sheets (12) are connected to the side positions of the bottom surface of the second cover (3) and are symmetrically arranged on both sides of the plastic plug (11).

4. A power diode device according to claim 3, characterized in that: The copper sheet (12) is an arc-shaped thin plate that is gradually bent from one side of the second pole pin to the other side of the second pole pin; When the bottom end of the second pole pin is welded on the PCB board, the bottom ends of the two copper sheets (12) elastically contact the PCB board, and when the second cover (3) moves downward, the two copper sheets (12) are pushed against the PCB board to continue to bend downward.

5. A power diode device according to claim 4, characterized in that: The two copper sheets (12) are inclined relative to the direction of the second pole pin.

6. A power diode device according to claim 5, characterized in that: A connecting piece (13) close to the bottom of the plastic plug (11) is connected between the two copper sheets (12); a tight hole (14) is provided in the middle of the plastic plug (11); when the connecting piece (13) moves upward as the two copper sheets (12) bend upward, it gradually approaches the tight hole (14); a cone thorn cover (15) is provided on the surface of the connecting piece (13); when the connecting piece (13) bends upward as the two copper sheets (12) bend upward and gradually approaches the tight hole (14), it can penetrate into the tight hole (14) to expand and open the tight hole (14); The cone thorn cover (15) is a cone-shaped cover which gradually tapers from the bottom to the top, and the top end of the cone thorn cover (15) is communicated with the bottom end.

7. A power diode device according to claim 6, characterized in that: The connecting piece (13) is provided with a through hole (16), the bottom end of the cone piercing cover (15) is connected to the through hole (16), and the bottom end opening of the cone piercing cover (15) is in vertical communication with the through hole (16).

8. A power diode device according to claim 7, characterized in that: Both sides of the two copper sheets (12) are provided with bites (17), and the parts where the connecting pieces (13) are connected to the two copper sheets (12) are close to the bites (17). When the two copper sheets (12) continue to bend due to the bottom ends being pressed against the PCB board, the top ends are bent and deformed with the bites (17) as the deformation parts, and while the bites (17) are bent and deformed, the connecting piece (13) carries the cone piercing cover (15) and pierces into the tight hole (14) of the plastic plug (11).

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