1U panel pluggable graphite surge protector

Abstract

The invention relates to a 1U panel pluggable graphite surge protector, and belongs to the technical field of surge protectors, the 1U panel pluggable graphite surge protector comprises an outer shell, an inner shell, a graphite gap assembly and a tripping mechanism, the graphite gap assembly comprises a first electrode plate, a second electrode plate, a graphite sheet and a graphite PCB, the arrangement direction of the plurality of graphite flakes is parallel to the height direction of the shell; the tripping mechanism comprises a tripping piece and an elastic piece, the second electrode piece is connected with the tripping piece in a tin soldering mode, and when the surge protector works, current sequentially passes through the pin elastic piece B, the tripping piece, the second electrode piece, the multiple graphite pieces, the first electrode piece and the pin elastic piece A. According to the invention, the test requirements of high current waveforms of 8 / 20 [mu] S and 10 / 350 [mu] S are compatible, and the method is more suitable for outdoor equipment; the hidden danger of follow current combustion of a switch type device is solved; the effect of reducing rear-end residual voltage while large-current follow current interruption is ensured; the problem that B-stage large through-flow and C-stage low residual voltage can be achieved only by using B + C stages in a conventional scheme is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of surge protectors, and in particular to a 1U panel pluggable graphite surge protector. Background Art

[0002] A surge protector, also known as a lightning arrester, is a device used to protect electrical equipment from damage caused by lightning or transient overvoltage fluctuations; for the convenience of the maintenance and replacement of surge protectors, pluggable surge protectors have emerged. A 1U panel pluggable surge protector refers to a panel pluggable surge protection device with a 1U standard rack height, that is, a unit height of 1.75 inches or 44.45 mm.

[0003] Currently, varistor modules are mainly used in 1U-sized panel pluggable surge protectors. The varistor elements in varistor surge protectors cannot withstand a current waveform of more than 10 kA with a 10 / 350 μS waveform during use, and the residual voltage after 10 μS of the surge cannot be made low enough, such as within 800 V. Moreover, in the case of a surge waveform of more than 80 kA with an 8 / 20 μS waveform, two-stage protection is required to meet the requirements of large current carrying capacity and low residual voltage. Summary of the Invention

[0004] To help solve the hidden danger of combustion caused by continuous fault current, while ensuring intermittent current and reducing the residual voltage at the rear end, and meeting the simultaneous tolerance of 10 / 350 μS and 8 / 20 μS surge current waveforms, the present invention provides a 1U panel pluggable graphite surge protector.

[0005] The 1U panel pluggable graphite surge protector provided by the present invention adopts the following technical solutions: A 1U panel pluggable graphite surge protector, comprising: A housing; An inner housing, which is arranged inside the housing; A graphite gap assembly, which is arranged in the inner housing. The graphite gap assembly includes a first electrode plate, a second electrode plate, graphite sheets, and a graphite PCB board. A plurality of graphite sheets are provided, and the arrangement direction of the plurality of graphite sheets is parallel to the height direction of the housing. The plurality of graphite sheets are arranged between the first electrode plate and the second electrode plate. The first electrode plate is used for electrically connecting with the pin spring piece A. A graphite gap spacer is arranged between adjacent graphite sheets, and each graphite sheet is electrically connected to the graphite PCB board; The tripping mechanism, the tripping mechanism includes a tripping piece and an elastic member. The tripping piece is slidably arranged in the inner shell, and the sliding direction of the tripping piece is parallel to the length direction of the outer shell. The second electrode piece is soldered to the tripping piece to form a tripping point, and the tripping point is located in the arrangement direction of the graphite sheets. The tripping piece is used to be electrically connected to the pin elastic piece B, and the elastic member is used to pull the tripping piece to move and separate from the second electrode piece during tripping. When the surge protector works, the current sequentially passes through the pin elastic piece B, the tripping piece, the second electrode piece, multiple graphite sheets, the first electrode piece, and the pin elastic piece A.

[0006] Preferably, the second electrode piece is integrally connected with a second electrode piece lead, and the second electrode piece lead is welded through the tripping piece.

[0007] Preferably, the second electrode piece lead is located at the central position of the graphite sheet.

[0008] Preferably, the inner shell has a graphite installation cavity, and the first electrode piece, the second electrode piece, the graphite sheets, and the graphite PCB board are all located in the graphite installation cavity. One side of the inner shell away from the opening of the graphite installation cavity has a tripping piece installation groove, the second electrode piece lead extends into the tripping piece installation groove, and the elastic member is arranged in the tripping piece installation groove.

[0009] Preferably, the graphite surge protector further includes a heat insulation member, and the heat insulation member includes a first heat insulation sheet, a second heat insulation sheet, and a third heat insulation sheet. The first heat insulation sheet covers the opening of the graphite installation cavity on the inner shell. There are two second heat insulation sheets, and the two second heat insulation sheets are respectively located between the inner wall of the graphite installation cavity and the outer walls of multiple graphite sheets. The third heat insulation sheet is located between the second electrode piece and the inner wall of the graphite installation cavity. The graphite gap spacer, the first heat insulation sheet, the second heat insulation sheet, and the third heat insulation sheet are all made of high-temperature heat insulation materials.

[0010] Preferably, a graphite fixing block is arranged between the first electrode piece and the second electrode piece. The graphite fixing block includes a graphite fixing block A and a graphite fixing block B. The graphite fixing block A and the graphite fixing block B enclose multiple graphite gap spacers and multiple graphite sheets. The graphite fixing block B separates the graphite PCB board and the graphite sheets. There are two graphite fixing blocks B, and the two graphite fixing blocks B enclose an introduction groove. The graphite PCB board is provided with pins, and the pins pass through the introduction groove and contact the graphite sheets.

[0011] Preferably, the arrangement direction of the graphite fixing block A and the graphite fixing block B is parallel to the length direction of the outer shell, and the graphite fixing block A is located on the side of the graphite fixing block B close to the insertion end of the surge protector.

[0012] Preferably, the tripping mechanism further includes a sliding block and a microswitch. The sliding block is connected to the tripping piece. The microswitch is arranged inside the housing. The sliding block is used to trigger the microswitch during tripping.

[0013] Preferably, a colored indicating piece is arranged on the sliding block. The indicating piece extends along the length direction of the housing away from the pin elastic piece A. An indicating window is opened at one end of the housing away from the pin elastic piece A. The indicating window is used to observe the state of the indicating piece.

[0014] Preferably, the housing includes a first housing and a second housing. The first housing and the second housing are spliced with each other. The edge of the first housing and the edge of the second housing are overlapped in a staggered manner. The first housing is provided with a first partition board. The second housing is provided with a second partition board. The first partition board is used to abut against the second partition board. After the first housing and the second housing are spliced, the overlapping part of the edge of the first housing and the edge of the second housing and the abutting part between the first partition board and the second partition board are staggered.

[0015] In summary, the present invention includes the following beneficial technical effects: When a continuous fault current occurs, multiple graphite sheets in the graphite gap assembly heat up, causing the temperature of the second electrode sheet to rise. When the solder at the tripping point melts due to the increase in temperature, under the traction of the elastic member, the tripping piece moves away from the second electrode sheet, causing the tripping piece to be separated from the second electrode sheet, thereby achieving tripping and disconnecting the electrical connection between the tripping piece and the second electrode sheet. Using graphite sheets inside the surge protector instead of a varistor module can reduce the possibility of combustion when a continuous fault current passes through, helping to solve the potential hazard of combustion caused by continuous fault current. Due to the limited size of the 1U surge protector, the internal space of the housing is limited. First, the arrangement direction of multiple graphite sheets is designed to be parallel to the height direction of the housing, enabling as many graphite sheets as possible to be placed. The more graphite sheets, the larger the chopped current. Second, compared with the case where multiple graphite sheets are arranged along the length direction of the housing, it can also shorten the current path, making the current path smoother and the residual voltage at the back end smaller, meeting the requirements of withstanding both 10 / 350μS and 8 / 20μS surge current waveforms, and solving the problem of achieving high current carrying capacity of class B and low residual voltage of class C that can only be realized by using class B + C in the conventional solution. Setting the tripping direction of the tripping piece along the length direction of the housing allows for a large moving space of the tripping piece, ensuring the tripping effect and sufficient electrical safety distance, and preventing potential arc problems caused by incomplete tripping such as solder melting and sticking. The second electrode pin is integrally provided with the second electrode sheet, and the second electrode pin is located at the center of the graphite sheet, which is beneficial to transfer heat to the second electrode pin, can shorten the heat transfer path, and the heat is more concentrated to transfer to the second electrode pin, improving the thermal response speed, so that the tripping action can be completed in a shorter time. Brief Description of the Drawings

[0016] Figure 1 is an exploded view of the overall structure of an embodiment of the present invention.

[0017] Figure 2 is a schematic structural view after hiding the first housing in an embodiment of the present invention.

[0018] Figure 3 is an exploded view of the inner housing in an embodiment of the present invention.

[0019] Figure 4 is an exploded view of the inner housing, the graphite fixing block and the heat insulation member in an embodiment of the present invention.

[0020] Figure 5 is a schematic structural view of the graphite gap assembly in an embodiment of the present invention.

[0021] Figure 6 is a schematic structural view of the tripping mechanism in an embodiment of the present invention.

[0022] Figure 7 is a schematic partial structural view in an embodiment of the present invention.

[0023] Figure 8 is a sectional view of the structure of the outer housing in an embodiment of the present invention.

[0024] Description of the Reference Numerals: 1. Outer housing; 101. First housing; 102. Second housing; 2. First electrode sheet; 3. Second electrode sheet; 4. Graphite sheet; 5. Graphite gap spacer; 6. Pin spring piece A; 7. Tripping piece; 8. Elastic member; 9. Pin spring piece B; 10. Second electrode pin; 11. Inner housing; 12. Graphite installation cavity; 13. Tripping piece installation groove; 14. Graphite PCB board; 15. Heat insulation member; 151. First heat insulation sheet; 152. Second heat insulation sheet; 153. Third heat insulation sheet; 16. Sliding block; 17. Microswitch; 18. Indicator piece; 19. Indicator window; 20. First partition board; 21. Second partition board; 22. Graphite fixing block; 221. Graphite fixing block A; 222. Graphite fixing block B; 23. Pin; 24. Introduction groove; 25. Hook; 26. Braided copper wire. Detailed Description of the Embodiment

[0025] The following will be further described in detail Figures 1-8 with reference to the present invention.

[0026] An embodiment of the present invention discloses a 1U panel pluggable graphite surge protector. Refer to Figure 1 , the 1U panel pluggable graphite surge protector includes a housing 1, an inner housing 11, a graphite gap assembly and a tripping mechanism; wherein, the housing 1 includes a first housing 101 and a second housing 102, the first housing 101 and the second housing 102 are spliced and fixed by bolts to form a sealed housing, the height of the spliced housing 1 is 1U to match a standard rack with a unit height of 1.75 inches or 44.45 mm, and the height direction of the housing 1 refers to Figure 1 the width direction of the housing 1 in

[0027] Refer to Figure 2 and Figure 3 , the inner housing 11 is fixedly installed in the housing 1, the length direction of the inner housing 11 is parallel to the length direction of the housing 1, a graphite installation cavity 12 is opened on one side of the inner housing 11, the opening of the graphite installation cavity 12 is located on one side in the height direction of the inner housing 11, the graphite gap assembly is arranged in the graphite installation cavity 12, and the inner housing 11 can provide protection for the graphite gap assembly.

[0028] Refer to Figure 2 and Figure 3 , specifically, the graphite gap assembly includes a first electrode plate 2, a second electrode plate 3, a graphite sheet 4 and a graphite PCB board 14, the first electrode plate 2 and the second electrode plate 3 are arranged opposite to each other in the graphite installation cavity 12, and the arrangement direction of the first electrode plate 2 and the second electrode plate 3 is parallel to the height direction of the housing 1; there are multiple graphite sheets 4 arranged, the arrangement direction of the multiple graphite sheets 4 is parallel to the height direction of the housing 1, the multiple graphite sheets 4 are located between the first electrode plate 2 and the second electrode plate 3, and both the first electrode plate 2 and the second electrode plate 3 are in contact with the adjacent graphite sheets 4, the first electrode plate 2 extends out of the inner housing 11 for electrically connecting with the pin spring piece A6; a graphite gap spacer 5 is clamped between adjacent graphite sheets 4, the graphite gap spacer 5 separates adjacent graphite sheets 4, so that there is a gap between adjacent graphite sheets 4 and intermittent current can flow; for the convenience of installing the graphite PCB board 14, grooves are opened on the mutually approaching surfaces of the first electrode plate 2 and the second electrode plate 3, and the graphite PCB board 14 is clamped between the grooves of the first electrode plate 2 and the second electrode plate 3, and each graphite sheet 4 is electrically connected to the graphite PCB board 14.

[0029] Refer to Figure 2 and Figure 3, specifically, the tripping mechanism includes a tripping piece 7 and an elastic member 8. On one side of the inner shell 11 away from the graphite installation cavity 12, there is a tripping piece installation groove 13. The tripping piece 7 is slidably arranged in the tripping piece installation groove 13. The sliding direction of the tripping piece 7 is parallel to the length direction of the outer shell 1. The first electrode piece 2 is located on the side of the inner shell 11 away from the tripping piece installation groove 13. A second electrode piece pin 10 is integrally connected to the second electrode piece 3. The second electrode piece pin 10 passes through the inner shell 11 and extends into the tripping piece installation groove 13 to be soldered to the tripping piece 7, forming a tripping point, so that the tripping point is located in the arrangement direction of the graphite sheets 4. The tripping piece 7 is used for electrically connecting with the pin spring piece B9, and the elastic member 8 is used for pulling the tripping piece 7 to move and separate from the second electrode piece pin 10 on the second electrode piece 3 during tripping. When the surge protector works, the current sequentially passes through the pin spring piece B9, the tripping piece 7, the second electrode piece pin 10, the second electrode piece 3, multiple graphite sheets 4, the first electrode piece 2, and the pin spring piece A6.

[0030] When a continuous fault current occurs, multiple graphite sheets 4 in the graphite gap assembly heat up, causing the second electrode piece 3 and the second electrode piece pin 10 to heat up. When the temperature rises to the point where the solder joint between the second electrode piece pin 10 and the tripping piece 7 melts, under the pulling action of the elastic member 8, the tripping piece 7 moves in a direction away from the second electrode piece pin 10, causing the tripping piece 7 to separate from the second electrode piece pin 10, thereby achieving tripping and disconnecting the electrical connection between the tripping piece 7 and the second electrode piece pin 10. In the surge protector of the present invention, compared with using a varistor module, the graphite sheets 4 can quickly trip and cut off the power supply when a continuous fault current passes, which helps to solve the hidden danger of combustion caused by the continuous fault current.

[0031] Due to the limited size of the 1U surge protector, the internal space of the outer shell 1 is limited. In the present invention, first, the arrangement direction of multiple graphite sheets 4 is designed to be parallel to the height direction of the outer shell 1, so that as many graphite sheets 4 as possible can be placed. The more graphite sheets 4 there are, the larger the chopped current. Second, compared with the case where multiple graphite sheets 4 are arranged along the length direction of the outer shell 1, it can also shorten the current path, make the current path smoother, and the residual voltage at the rear end smaller, meeting the requirements of withstanding both 10 / 350μS and 8 / 20μS surge current waveforms at the same time, and solving the problem of achieving high current carrying capacity of class B and low residual voltage of class C that can only be achieved by using class B + C in the conventional solution. Third, the tripping direction of the tripping piece 7 is set along the length direction of the outer shell 1, so that the tripping piece 7 has a large moving space, which can ensure the tripping effect and ensure sufficient electrical safety distance, preventing potential arc problems caused by incomplete tripping such as solder melting, wire drawing, and adhesion.

[0032] Refer to Figure 1 and Figure 4, Further, in the embodiment of the present invention, there are 10 graphite sheets 4 arranged. In other embodiments, the number of graphite sheets 4 can be set as needed, and the arrangement direction of multiple graphite sheets 4 can also be designed to be parallel to the length direction of the housing 1.

[0033] Referring to Figure 4 and Figure 5 , to further improve the product safety performance and solve the hidden danger of combustion caused by continuous fault current, the graphite gap spacer 5 is made of a high-temperature resistant and heat-insulating material. Specifically, the graphite gap spacer 5 is made of polytetrafluoroethylene material. In other embodiments, the graphite gap spacer 5 can also be made of ceramic material or other high-temperature resistant and heat-insulating materials. The graphite gap spacer 5 is elliptical annular, which helps to save costs. The polytetrafluoroethylene material has a wide temperature range, the long-term use temperature is from -200°C to 260°C, and the short-term can reach 400°C. It is insulated and high-temperature resistant, which can improve the weather resistance of the graphite gap spacer 5, and it will slowly decompose above 450°C without carbonization. Moreover, the thickness of the polytetrafluoroethylene sheet can be as thin as 0.01 mm, which can fully meet the different gap requirements between the graphite sheets 4.

[0034] Referring to Figure 1 , Figure 4 and Figure 5 , to facilitate the fixation of the graphite sheet 4 and the graphite gap spacer 5, a graphite fixing block 22 is fixed between the first electrode sheet 2 and the second electrode sheet 3 by screws. The graphite fixing block 22 includes a graphite fixing block A221 and a graphite fixing block B222. The arrangement direction of the graphite fixing block A221 and the graphite fixing block B222 is parallel to the length direction of the housing 1, and the graphite fixing block A221 is located on the side of the graphite fixing block B222 close to the plug-in end of the surge protector. The graphite fixing block A221 and the graphite fixing block B222 surround multiple graphite gap spacers 5 and multiple graphite sheets 4, which is convenient for installing and fixing the graphite sheet 4 and the graphite gap spacer 5 between the graphite fixing block A221 and the graphite fixing block B222. Specifically, grooves are provided on the inner walls of the graphite fixing block A221 and the graphite fixing block B222, and both ends of the graphite gap spacer 5 are respectively clamped in the grooves of the graphite fixing block A221 and the graphite fixing block B222, so as to fix the position of the graphite gap spacer 5.

[0035] Referring to Figure 1 , Figure 4 and Figure 5 , the graphite fixing block B222 separates the graphite PCB board 14 and the graphite sheet 4; thus, the graphite PCB board 14 is located on the side of the graphite sheet 4 away from the plug-in end of the surge protector. On the one hand, it does not affect the number of graphite sheets 4 set; on the other hand, it helps to reduce the influence of the heat of the graphite sheet 4 on the graphite PCB board 14, and avoids the situation that the performance of the graphite PCB board 14 decreases or is damaged due to overheating.

[0036] Reference Figure 4 and Figure 5 , there are two graphite fixing blocks B222, and an inlet groove 24 is formed by surrounding the two graphite fixing blocks B222. The graphite PCB board 14 is provided with pin headers 23, and the pin headers 23 correspond to the graphite sheets 4 one by one. The pin headers 23 pass through the inlet groove 24 and are in contact with the corresponding graphite sheets 4. When a fault current passes through the graphite gap assembly, the graphite PCB board 14 is conducive to the fault current sequentially breaking down the gaps between the graphite sheets 4.

[0037] Reference Figure 1 and Figure 3 , for facilitating the protection of the inner shell 11 and the outer shell 1, there are heat insulation buffer regions between the inner wall of the graphite installation cavity 12 on the side far from the opening and the graphite gap assembly, and between the inner walls on the opposite sides of the graphite installation cavity 12 in the thickness direction of the outer shell 1 and the graphite gap assembly; the graphite surge protector further includes a heat insulation member 15. Specifically, the heat insulation member 15 includes a first heat insulation sheet 151, a second heat insulation sheet 152, and a third heat insulation sheet 153. The first heat insulation sheet 151, the second heat insulation sheet 152, and the third heat insulation sheet 153 are all made of high-temperature resistant heat insulation materials. Specifically, the first heat insulation sheet 151, the second heat insulation sheet 152, and the third heat insulation sheet 153 are all polytetrafluoroethylene sheets. In other embodiments, the first heat insulation sheet 151, the second heat insulation sheet 152, and the third heat insulation sheet 153 can also be made of ceramic materials or other high-temperature resistant heat insulation materials. Among them, the first heat insulation sheet 151 covers the opening of the graphite installation cavity 12 of the inner shell 11, and the cross-sectional area of the first heat insulation sheet 151 is larger than the cross-sectional area of the graphite installation cavity 12 of the inner shell 11, so as to separate the first electrode sheet 2 from the inner wall of the outer shell 1.

[0038] Reference Figure 1 and Figure 3 , there are two second heat insulation sheets 152, and the arrangement direction of the two second heat insulation sheets 152 is parallel to the thickness direction of the outer shell 1. The two second heat insulation sheets 152 are respectively located in the heat insulation buffer regions between the inner wall of the graphite installation cavity 12 and the outer walls of the plurality of graphite sheets 4, so that the graphite fixing block A221, the graphite fixing block B222, and the graphite sheets 4 can be separated from the inner wall of the inner shell 11.

[0039] Reference Figure 1 and Figure 4 , the third heat insulation sheet 153 is located in the heat insulation buffer region between the second electrode sheet 3 and the inner wall of the graphite installation cavity 12 to separate the second electrode sheet 3 from the inner wall of the graphite installation cavity 12. Through the arrangement of the first heat insulation sheet 151, the second heat insulation sheet 152, and the third heat insulation sheet 153, the transfer of heat to the inner shell 11 and the outer shell 1 can be reduced, so as to reduce the damage of the inner shell 11 and the outer shell 1.

[0040] Reference Figure 1 and Figure 3, the second electrode pin 10 is integrally connected to the second electrode 3 and located at the center of the graphite sheet 4, which is beneficial to transfer heat to the second electrode pin 10, can shorten the heat transfer path, and the heat is more concentratedly transferred to the second electrode pin 10, improving the thermal response speed and enabling the tripping action to be completed in a shorter time. Further, the tripping point is set on the side of the inner shell 11, and both ends of the tripping piece installation groove 13 communicate with the spaces at both ends in the length direction of the outer shell 1, so that the heat at the tripping point can dissipate towards both ends in the length direction of the outer shell 1, and the space for air flow is large, which can greatly improve the heat dissipation effect at the tripping point. In other embodiments, the second electrode pin 10 can also extend to the side of the inner shell 11 close to the plug end of the surge protector, so that the tripping point is located on the side of the inner shell 11 close to the plug end in the length direction.

[0041] Refer to Figure 3 , further, the second electrode pin 10 is welded to the tripping piece 7 by piercing. Due to the limited space of the tripping piece installation groove 13, the welding table surface is small. By welding the second electrode pin 10 to the tripping piece 7 by piercing, the welding strength can be ensured, and at the same time, low-melting-point tin can be used for welding to improve the tripping sensitivity. In other embodiments, the second electrode pin 10 and the tripping piece 7 can also be connected by surface welding.

[0042] Refer to Figure 3 and Figure 6 , the tripping piece 7 is electrically connected to the pin elastic piece B9 through a braided copper wire 26. To adapt to the required direction of the braided copper wire 26 after tripping, the braided copper wire 26 is flexible and bent, reducing the hidden danger that the braided copper wire 26 resists the tripping piece 7 and causes incomplete tripping; specifically, the braided copper wire 26 adopts a tight-type braided copper wire, and the cross-section of the braided copper wire 26 is greater than 5mm 2 . Using the braiding technology, the copper wires are tightly braided. By increasing the cross-section and tightness of the braided copper wire 26, it helps to improve the flow of lightning current and weaken the repulsive force between the copper wires inside the copper wire.

[0043] Refer to Figure 6 and Figure 7 , to facilitate pulling the tripping piece 7 away from the second electrode pin 10 during tripping, a hook 25 is integrally formed on the tripping piece 7, and the elastic member 8 is arranged in the tripping piece installation groove 13. Specifically, the elastic member 8 includes a spring. One end of the spring is fixed on the hook 25, and the other end is fixed on the inner wall of the tripping piece installation groove 13 of the inner shell 11. The spring is located on the side of the second electrode pin 10 close to the pin elastic piece B9, and the extending direction of the spring is parallel to the moving direction of the tripping piece 7. When the tripping piece 7 is soldered to the second electrode pin 10, the spring is in a stretched state.

[0044] Refer to Figure 1 andFigure 7 In the embodiment of the present invention, two springs are provided, and the hooks 25 correspond to the springs one by one. The arrangement direction of the two springs is parallel to the thickness direction of the outer shell 1. Since the release piece mounting groove 13 is located on the side of the inner shell 11, the installation of the two springs is satisfied, which helps to ensure the release effect. In other embodiments, the spring can also be replaced with an elastic cord.

[0045] When the soldering between the second electrode pin 10 and the release piece 7 melts, under the elastic force of the spring, the release piece 7 moves towards the direction close to the pin elastic piece B9, so that the release piece 7 is separated from the second electrode pin 10, thereby realizing the release.

[0046] Refer to Figure 2 and Figure 3 As shown in FIGS. and, the release mechanism further includes a sliding block 16 and a microswitch 17. The sliding block 16 is used to trigger the microswitch 17 during the release. The sliding block 16 is located on one side of the inner shell 11 close to the surge protector insertion end. The release piece 7 is L-shaped. One end of the release piece 7 far from the second electrode pin 10 is fixedly connected to the sliding block 16. The microswitch 17 is installed in the outer shell 1, and the microswitch 17 is located on the side of the sliding block 16 far from the inner shell 11.

[0047] When the soldering between the second electrode pin 10 and the release piece 7 melts, under the traction of the spring, the release piece 7 moves towards the direction close to the pin elastic piece B9. The release piece 7 drives the sliding block 16 to move synchronously, so that the sliding block 16 approaches the microswitch 17. Then the sliding block 16 presses the microswitch 17 to disconnect the telemetry signal as an alarm.

[0048] Refer to Figure 1 and Figure 7 As shown in FIGS. and, a colored indicating piece 18 is fixed on the sliding block 16. The indicating piece 18 extends along the length direction of the outer shell 1 towards the direction away from the surge protector insertion end. Specifically, the indicating piece 18 is attached to the outer wall of the inner shell 11 and spans the inner shell 11. An indicating window 19 is provided at one end of the first housing 101 far from the pin elastic piece A6. One end of the indicating piece 18 close to the indicating window 19 is L-shaped. The indicating window 19 is used to observe the state of the indicating piece 18. Among them, the color on the surface of the indicating piece 18 can be set as required.

[0049] When the release piece 7 is released from the second electrode pin 10, the release piece 7 drives the sliding block 16 to move, so that the sliding block 16 pulls the colored part of the indicating piece 18 close to the indicating window 19. Thus, through the indicating window 19 on the outside of the first housing 101, the indicating piece 18 can be seen, so that the maintenance personnel can observe the release situation of the release mechanism from the outside. The indicating piece 18 directly spans the inner shell 11, and the sliding block 16 linearly pulls the indicating piece 18, so that the arrangement of the indicating piece 18 is less interfered with.

[0050] Reference Figure 1 and Figure 8 As shown in FIGS. 1 and 2, the edge of the first housing 101 is overlapped with the edge of the second housing 102 in a staggered manner. Specifically, a first overlapping groove is formed in the inner wall of the edge of the first housing 101, and a second overlapping groove is formed in the outer wall of the edge of the second housing 102. When the first housing 101 and the second housing 102 are spliced, the edge of the first housing 101 overlaps in the second overlapping groove, and the edge of the second housing 102 overlaps in the first overlapping groove, thereby forming an interlocking structure. Further, a first partition plate 20 is fixed to the first housing 101, and a second partition plate 21 is fixed to the second housing 102. The first partition plate 20 extends out of the edge of the first housing 101, and there is a certain distance between the first partition plate 20 and the edge of the first housing 101. The first partition plate 20 is used to abut against the second partition plate 21. After the first housing 101 and the second housing 102 are spliced, the overlapping portion between the edge of the first housing 101 and the edge of the second housing 102 is staggered from the abutting portion between the first partition plate 20 and the second partition plate 21.

[0051] By staggering the overlapping portion between the edge of the first housing 101 and the edge of the second housing 102 from the abutting portion between the first partition plate 20 and the second partition plate 21, the creepage path is greatly extended, thereby effectively avoiding creepage at the first electrode plate 2, the second electrode plate 3, and the tripping point, and playing an electrical isolation role.

[0052] The implementation principle of the embodiment of the present invention is as follows: When a continuous fault current occurs, multiple graphite sheets 4 in the graphite gap assembly heat up, causing the second electrode plate 3 and the second electrode plate pin 10 to heat up. When the temperature rises to the melting point of the solder between the second electrode plate pin 10 and the tripping piece 7, under the pulling action of the elastic member 8, the tripping piece 7 moves towards the direction close to the pin spring piece B9, so that the tripping piece 7 is separated from the second electrode plate pin 10, thereby realizing tripping and disconnecting the electrical connection between the tripping piece 7 and the second electrode plate pin 10. Then, the sliding block 16 presses the micro switch 17 to disconnect the telemetry signal as an alarm. Compared with using a varistor module, the use of graphite sheets 4 inside the surge protector of the present invention can quickly trip and cut off the power supply when a continuous fault current passes, which helps to solve the hidden danger of combustion caused by the continuous fault current.

[0053] Due to the limited size of the 1U surge protector, the internal space of the housing 1 is limited. In the present invention, first, the arrangement direction of a plurality of graphite sheets 4 is designed to be parallel to the height direction of the housing 1, so that as many graphite sheets 4 can be placed as possible. The more graphite sheets 4 there are, the larger the chopped current; second, compared with the case where a plurality of graphite sheets 4 are arranged along the length direction of the housing 1, the current path can also be shortened, making the current path smoother, the residual voltage at the rear end smaller, and meeting the requirements of withstanding both 10 / 350 μS and 8 / 20 μS surge current waveforms simultaneously, solving the problem of achieving high current carrying capacity of Class B and low residual voltage of Class C that can only be realized by using Class B + C in the conventional solution; third, the tripping direction of the trip piece 7 is set along the length direction of the housing 1, so that the moving space of the trip piece 7 is large, the tripping effect can be guaranteed, and a sufficient electrical safety distance can be ensured, preventing potential arc hazards caused by incomplete tripping such as molten tin soldering, wire drawing, and adhesion; and the second electrode pin 10 is integrally connected to the second electrode piece 3 and is located at the center of the graphite sheet 4, which is beneficial to transfer heat to the second electrode pin 10, can shorten the heat transfer path, and the heat is more concentratedly transferred to the second electrode pin 10, improving the thermal response speed and enabling the tripping action to be completed in a shorter time.

[0054] The above are all preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A 1U panel pluggable graphite surge protector, characterized in that, Comprising: A housing (1); An inner housing (11), which is disposed inside the housing (1); A graphite gap assembly, which is disposed in the inner housing (11). The graphite gap assembly includes a first electrode sheet (2), a second electrode sheet (3), graphite sheets (4), and a graphite PCB board (14). A plurality of the graphite sheets (4) are provided, and the arrangement direction of the plurality of graphite sheets (4) is parallel to the height direction of the housing (1). The plurality of graphite sheets (4) are disposed between the first electrode sheet (2) and the second electrode sheet (3). The first electrode sheet (2) is used for electrically connecting with a pin spring piece A (6). A graphite gap spacer (5) is disposed between adjacent graphite sheets (4), and each graphite sheet (4) is electrically connected to the graphite PCB board (14); A tripping mechanism, which includes a tripping piece (7) and an elastic member (8). The tripping piece (7) is slidably disposed in the inner housing (11), and the sliding direction of the tripping piece (7) is parallel to the length direction of the housing (1). The second electrode sheet (3) is soldered to the tripping piece (7) to form a tripping point, and the tripping point is located in the arrangement direction of the graphite sheets (4). The tripping piece (7) is used for electrically connecting with a pin spring piece B (9). The elastic member (8) is used for pulling the tripping piece (7) to move and separate from the second electrode sheet (3) during tripping. When the surge protector works, the current sequentially passes through the pin spring piece B (9), the tripping piece (7), the second electrode sheet (3), the plurality of graphite sheets (4), the first electrode sheet (2), and the pin spring piece A (6).

2. The 1U panel pluggable graphite surge protector according to claim 1, wherein: The second electrode sheet (3) is integrally connected with a second electrode sheet lead (10), and the second electrode sheet lead (10) is welded through the tripping piece (7).

3. The 1U panel pluggable graphite surge protector according to claim 2, characterized in that: The second electrode sheet lead (10) is located at the central position of the graphite sheet (4).

4. A 1U panel pluggable graphite surge protector according to claim 2, characterized in that: The inner housing (11) has a graphite installation cavity (12), and the first electrode sheet (2), the second electrode sheet (3), the graphite sheets (4), and the graphite PCB board (14) are all located inside the graphite installation cavity (12). One side of the inner housing (11) away from the opening of the graphite installation cavity (12) has a tripping piece installation groove (13). The second electrode sheet lead (10) extends into the tripping piece installation groove (13), and the elastic member (8) is disposed in the tripping piece installation groove (13).

5. The 1U panel pluggable graphite surge protector according to claim 4, characterized in that: The graphite surge protector further includes a heat insulation member (15), which includes a first heat insulation sheet (151), a second heat insulation sheet (152), and a third heat insulation sheet (153). The first heat insulation sheet (151) covers the opening of the graphite installation cavity (12) on the inner housing (11). Two of the second heat insulation sheets (152) are provided, and the two second heat insulation sheets (152) are respectively located between the inner wall of the graphite installation cavity (12) and the outer walls of the plurality of graphite sheets (4). The third heat insulation sheet (153) is located between the second electrode sheet (3) and the inner wall of the graphite installation cavity (12). The graphite gap spacer (5), the first heat insulation sheet (151), the second heat insulation sheet (152), and the third heat insulation sheet (153) are all made of high-temperature resistant heat insulation materials.

6. The 1U panel pluggable graphite surge protector according to claim 1, characterized in that: A graphite fixing block (22) is arranged between the first electrode plate (2) and the second electrode plate (3). The graphite fixing block (22) includes a graphite fixing block A (221) and a graphite fixing block B (222); the graphite fixing block A (221) and the graphite fixing block B (222) enclose a plurality of graphite gap spacers (5) and a plurality of graphite plates (4), and the graphite fixing block B (222) separates the graphite PCB board (14) and the graphite plate (4); there are two graphite fixing blocks B (222), and the two graphite fixing blocks B (222) enclose an introduction groove (24). The graphite PCB board (14) is provided with a pin (23), and the pin (23) passes through the introduction groove (24) and contacts the graphite plate (4).

7. A 1U panel pluggable graphite surge protector according to claim 6, characterized in that: The arrangement direction of the graphite fixing block A (221) and the graphite fixing block B (222) is parallel to the length direction of the housing (1), and the graphite fixing block A (221) is located on the side of the graphite fixing block B (222) close to the plug end of the surge protector.

8. A 1U panel pluggable graphite surge protector according to claim 1, characterized in that: The tripping mechanism further includes a sliding block (16) and a microswitch (17). The sliding block (16) is connected to the tripping piece (7), the microswitch (17) is arranged in the housing (1), and the sliding block (16) is used to trigger the microswitch (17) during tripping.

9. A 1U panel pluggable graphite surge protector according to claim 8, characterized in that: A colored indicating piece (18) is arranged on the sliding block (16). The indicating piece (18) extends along the length direction of the housing (1) away from the pin spring piece A (6). An indicating window (19) is opened at one end of the housing (1) away from the pin spring piece A (6), and the indicating window (19) is used to observe the state of the indicating piece (18).

10. A 1U panel pluggable graphite surge protector according to any one of claims 1-9, characterized in that: The housing (1) includes a first housing body (101) and a second housing body (102). The first housing body (101) and the second housing body (102) are spliced with each other. The edge of the first housing body (101) is overlapped with the edge of the second housing body (102) in a staggered manner. The first housing body (101) is provided with a first partition plate (20), and the second housing body (102) is provided with a second partition plate (21). The first partition plate (20) is used to abut against the second partition plate (21). After the first housing body (101) and the second housing body (102) are spliced, the overlapping part of the edge of the first housing body (101) and the edge of the second housing body (102) is staggered with the abutting part between the first partition plate (20) and the second partition plate (21).

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