Fuse employing double-groove pressure point structure

Abstract

The utility model belongs to the technical field of fuses, and particularly relates to a fuse adopting a double-groove pressure point structure, which comprises a tube body, a fuse piece, a first outer cap and a second outer cap, the fuse piece is arranged in the tube body, the first outer cap is sleeved at one end of the tube body, the second outer cap is sleeved at the other end of the tube body, one end of the fuse piece is electrically connected with the first outer cap, and the other end of the fuse piece is electrically connected with the second outer cap. The other end of the fuse piece is electrically connected with the second outer cap, a first fixing groove and a first limiting groove are formed in the outer side of one end of the tube body, a first fixing piece is arranged on the side portion of the first outer cap, one end of the first fixing piece is embedded into the first fixing groove, and the side portion of the first outer cap is partially embedded into the first limiting groove. According to the utility model, one end of the first fixing piece is embedded into the first fixing groove, and the side part of the first outer cap is partially embedded into the first limiting groove, so that the fixing effect of the first outer cap on the tube body can be enhanced, the risk that the fuse is uncapped due to short circuit is reduced, and the fuse can bear greater energy.

Description

Technical Field

[0001] The utility model belongs to the technical field of fuses, and particularly relates to a fuse adopting a double-slot pressing point structure. Background Art

[0002] With the increasing global demand for renewable energy, photovoltaic power generation, as a clean and renewable energy source, has been more and more widely used. However, during the operation of a photovoltaic power generation system, the current may become too large due to various reasons (such as short circuit, overload, etc.), thereby damaging the system. Therefore, in a photovoltaic power generation system, as an important protection device, the performance of the fuse directly affects the safe operation of the system. At present, the voltage of the photovoltaic system is gradually approaching 2000Vdc, and low-voltage fuses can no longer meet the protection requirements. In order to meet the circuit protection requirements of the 2000Vdc photovoltaic system, a fuse for 2000Vdc photovoltaic protection is developed to solve the industry problem of the mismatch between the fuse voltage and the system voltage. However, high-voltage fuses are prone to de-capping when the circuit is short-circuited, making them unable to withstand greater energy, and it is easy to occur that the fuse cannot be disconnected in time or the breaking capacity is insufficient when breaking high voltage and large current, thereby reducing the safety of the photovoltaic system.

[0003] Therefore, there is an urgent need to propose a new technical solution to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to: aiming at the deficiencies of the prior art, provide a fuse adopting a double-slot pressing point structure, which can reduce the risk of the fuse de-capping caused by circuit short-circuit, enable it to withstand greater energy, avoid the problems that the fuse may not be disconnected in time or the breaking capacity is insufficient when breaking high voltage and large current, thereby improving the safety of the photovoltaic system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A fuse adopting a double-slot pressing point structure includes a tube body, a fuse strip, a first outer cap and a second outer cap. The fuse strip is arranged inside the tube body. The first outer cap is sleeved at one end of the tube body, and the second outer cap is sleeved at the other end of the tube body. One end of the fuse strip is electrically connected to the first outer cap, and the other end of the fuse strip is electrically connected to the second outer cap. A first fixing groove and a first limiting groove are arranged on the outer side of one end of the tube body. A first fixing member is arranged on the side of the first outer cap, and one end of the first fixing member is embedded into the first fixing groove, and a part of the side of the first outer cap is embedded into the first limiting groove.

[0007] Preferably, a second fixing groove and a second limiting groove are provided on the outer side of the other end of the tube body. A second fixing member is provided on the side of the second outer cap. One end of the second fixing member is embedded in the second fixing groove, and a part of the side of the second outer cap is embedded in the second limiting groove.

[0008] Preferably, a first inner cap is provided at one end of the tube body. The first outer cap is sleeved on the outer side of the first inner cap. The first inner cap is electrically connected to the fuse piece and the first outer cap respectively.

[0009] Preferably, a second inner cap is provided at one end of the tube body. The second outer cap is sleeved on the outer side of the second inner cap. The second inner cap is electrically connected to the fuse piece and the second outer cap respectively.

[0010] Preferably, the inside of the tube body is filled with arc extinguishing material, and the arc extinguishing material wraps the surface of the fuse piece.

[0011] Preferably, the surface of the fuse piece has at least one discharge hole.

[0012] Preferably, a narrow diameter is provided between adjacent holes of the discharge holes.

[0013] Preferably, the distance between adjacent discharge holes is 8 mm to 10 mm.

[0014] Preferably, at least one bending part is formed on the surface of the fuse piece.

[0015] Preferably, a first connecting part is provided at one end of the fuse piece, and a second connecting part is provided at the other end of the fuse piece.

[0016] The beneficial effects of the present utility model are as follows: The present utility model includes a tube body, a fuse piece, a first outer cap, and a second outer cap. The tube body can be a ceramic tube for placing the fuse piece. The fuse piece can be silver, which will melt when an abnormal high voltage and high current occur, thereby playing a role in protecting the circuit. The fuse piece is arranged inside the tube body. The first outer cap is sleeved at one end of the tube body, and the second outer cap is sleeved at the other end of the tube body. One end of the fuse piece is electrically connected to the first outer cap, and the other end of the fuse piece is electrically connected to the second outer cap. Both the first outer cap and the second outer cap are used for electrical connection with external devices. On the outer side of one end of the tube body, there are a first fixing groove and a first limiting groove. Both the first fixing groove and the first limiting groove are continuous grooves arranged on the outer side of the tube body, that is, annular grooves. On the side part of the first outer cap, there is a first fixing member. One end of the first fixing member is embedded into the first fixing groove, and a part of the side part of the first outer cap is embedded into the first limiting groove. The first fixing member is formed by mechanical extrusion of the first outer cap, that is, a pressing point structure, so that the first outer cap can be fixed on the tube body. By mechanically performing annular extrusion on the first outer cap, a part of the first outer cap is embedded into the first limiting groove along the ring shape, that is, a closing and tightening structure, which enhances the fixing effect of the first outer cap on the tube body. One end of the first fixing member of the present utility model is embedded into the first fixing groove, and a part of the side part of the first outer cap is embedded into the first limiting groove, which can enhance the fixing effect of the first outer cap on the tube body, reduce the risk of the fuse cap coming off due to circuit short - circuit, enable it to withstand greater energy, and avoid the problems that the fuse may not be able to break timely or has insufficient breaking ability when breaking high voltage and large current, thereby improving the safety of the photovoltaic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 One of the exploded views of the present utility model.

[0018] Figure 2 Another exploded view of the present utility model.

[0019] Figure 3 Another exploded view of the present utility model.

[0020] Figure 4 Partial structural schematic diagram of the fuse piece of the present utility model.

[0021] Wherein: 1. Tube body; 11. First fixing groove; 12. First limiting groove; 13. Second fixing groove; 14. Second limiting groove; 2. Fuse piece; 21. Drain holes; 22. Narrow diameter; 23. Bending part; 24. First connecting part; 25. Second connecting part; 3. First outer cap; 31. First fixing member; 4. Second outer cap; 41. Second fixing member; 5. First inner cap; 6. Second inner cap; 7. Arc - extinguishing material. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] If certain terms are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. The specification and claims do not use the difference in names as a way to distinguish components, but rather use the difference in the functions of components as the criterion for distinction. As used throughout the specification and claims, the term "comprising" is an open-ended term and should be interpreted as "including but not limited to". In the utility model, unless otherwise clearly specified and limited, terms such as "installed", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0023] The following will further elaborate on the present utility model in conjunction with the attached Figures 1 to 4 drawings and specific embodiments, but it is not intended to limit the present utility model.

[0024] Embodiment 1

[0025] A fuse with a double-slot press point structure includes a tube body 1, a fuse link 2, a first outer cap 3, and a second outer cap 4. The tube body 1 can be a ceramic tube or a fiber tube and is used to place the fuse link 2. The fuse link 2 can be made of silver and will melt when abnormal high voltage and high current occur, thus playing a role in protecting the circuit. There can be multiple fuse links 2, which can be adaptively set according to the magnitude of the passing current. The fuse link 2 is arranged inside the tube body 1. The first outer cap 3 is sleeved on one end of the tube body 1, and the second outer cap 4 is sleeved on the other end of the tube body 1. One end of the fuse link 2 is electrically connected to the first outer cap 3, and the other end of the fuse link 2 is electrically connected to the second outer cap 4. Both the first outer cap 3 and the second outer cap 4 are used for electrical connection with external devices. On the outer side of one end of the tube body 1, there are a first fixing groove 11 and a first limiting groove 12. Both the first fixing groove 11 and the first limiting groove 12 are continuous grooves arranged on the outer side of the tube body 1, that is, annular grooves. On the side part of the first outer cap 3, there is a first fixing part 31. One end of the first fixing part 31 is embedded into the first fixing groove 11, and a part of the side part of the first outer cap 3 is embedded into the first limiting groove 12. The first fixing part 31 is formed by mechanical extrusion of the first outer cap 3, that is, a press point structure, so that the first outer cap 3 can be fixed on the tube body 1. By mechanically performing annular extrusion on the first outer cap 3, a part of the first outer cap 3 is embedded into the first limiting groove 12 along the ring shape, that is, a closing and tightening structure, which enhances the fixing effect of the first outer cap 3 on the tube body 1, makes the combination of the first outer cap 3 and the tube body 1 more firm, and further reduces the risk of the fuse cap coming off due to a short circuit in the circuit. One end of the first fixing part 31 is embedded into the first fixing groove 11, and a part of the side part of the first outer cap 3 is embedded into the first limiting groove 12, which can enhance the fixing effect of the first outer cap 3 on the tube body 1, reduce the risk of the fuse cap coming off due to a short circuit in the circuit, enable it to withstand greater energy, and avoid the problems of being unable to break timely or insufficient breaking ability that may occur when the fuse breaks high voltage and large current, thereby improving the safety of the photovoltaic system. The first outer cap 3 is crimped on the tube body 1 to provide the first layer of fastening method. The first outer cap 3 and the tube body 1 adopt a closing and tightening structure to provide the second layer of fastening method. At the same time, a press point structure is adopted to provide the third layer of fastening method, making the combination of the first outer cap 3 and the tube body 1 more stable, further reducing the risk of the fuse cap coming off due to a short circuit in the circuit, and enabling it to withstand greater energy.

[0026] In this embodiment, a second fixing groove 13 and a second limiting groove 14 are provided on the outer side of the other end of the pipe body 1. Both the second fixing groove 13 and the second limiting groove 14 are continuous grooves provided on the outer side of the pipe body 1, that is, annular grooves. A second fixing member 41 is provided on the side of the second outer cap 4. One end of the second fixing member 41 is embedded in the second fixing groove 13, and a part of the side of the second outer cap 4 is embedded in the second limiting groove 14. The second fixing member 41 is formed by mechanical extrusion of the second outer cap 4, that is, a press point structure, so that the second outer cap 4 can be fixed on the pipe body 1. By mechanically performing annular extrusion on the second outer cap 4, a part of the second outer cap 4 is embedded into the second limiting groove 14 along the ring shape, that is, a closing and tightening structure, which enhances the fixing effect of the second outer cap 4 on the pipe body 1, makes the combination of the second outer cap 4 and the pipe body 1 more firm, and further reduces the risk of the fuse cap coming off due to circuit short - circuit. One end of the second fixing member 41 is embedded in the second fixing groove 13, and a part of the side of the second outer cap 4 is embedded in the second limiting groove 14, which can further enhance the fixing effect of the second outer cap 4 on the pipe body 1, reduce the risk of the fuse cap coming off due to circuit short - circuit, enable it to withstand greater energy, and avoid the problems that the fuse may not be able to break timely or has insufficient breaking capacity when breaking high - voltage and large - current, thereby improving the safety of the photovoltaic system. The second outer cap 4 is crimped on the pipe body 1 to provide the first layer of fastening method. The second outer cap 4 and the pipe body 1 adopt a closing and tightening structure to provide the second layer of fastening method, and at the same time adopt a press point structure to provide the third layer of fastening method, making the combination of the second outer cap 4 and the pipe body 1 more stable, further reducing the risk of the fuse cap coming off due to circuit short - circuit, and enabling it to withstand greater energy.

[0027] In this embodiment, a first inner cap 5 is provided at one end of the pipe body 1. The first outer cap 3 is sleeved on the outer side of the first inner cap 5. The first inner cap 5 is electrically connected to the fuse piece 2 and the first outer cap 3 respectively. The first inner cap 5 is hollow and is crimped at one end of the pipe body 1. The fuse piece 2 passes through the pipe body 1 and is welded on the first inner cap 5. The first outer cap 3 is crimped on the first inner cap 5. By controlling the relative dimensions of the first outer cap 3 and the first inner cap 5, the tightness of the fit is ensured.

[0028] In this embodiment, a second inner cap 6 is provided at one end of the pipe body 1. The second outer cap 4 is sleeved on the outer side of the second inner cap 6. The second inner cap 6 is electrically connected to the fuse piece 2 and the second outer cap 4 respectively. The second inner cap 6 is hollow and is crimped at one end of the pipe body 1. The fuse piece 2 passes through the pipe body 1 and is welded on the second inner cap 6. The second outer cap 4 is crimped on the second inner cap 6. By controlling the relative dimensions of the second outer cap 4 and the second inner cap 6, the tightness of the fit is ensured.

[0029] Embodiment 2

[0030] The difference between this embodiment and Embodiment 1 is that the surface of the fuse sheet 2 has at least one discharge hole 21. By providing the discharge hole 21, the fuse sheet 2 can meet the breaking requirement of 50 kA @ 2000 Vdc.

[0031] In this embodiment, a narrow path 22 is provided between adjacent holes of the discharge hole 21. The length of the fuse sheet 2 needs to meet the voltage requirement of 2000 Vdc. The specific length setting can be designed according to the actual situation and is not specifically limited here. By designing the width of the narrow path 22, it can meet the requirement of a current density of 50 kA. The specific width setting can be designed according to the actual situation and is not specifically limited here.

[0032] In this embodiment, the distance L between adjacent discharge holes 21 is 8 mm to 10 mm. For example, it can be 8 mm to 8.5 mm, 8.5 mm to 9 mm, 9 mm to 9.5 mm, or 9.5 mm to 10 mm. Preferably, L is 8.5 mm to 9.5 mm. By designing the pitch between the discharge holes 21, there is enough fracture surface to withstand the voltage after fusing, enabling the fuse sheet 2 to withstand a DC voltage of 2000 V and a large current of 50 kA in the tube body 1 with a length less than 130 mm, achieving normal breaking without catching fire or arcing.

[0033] In this embodiment, at least one bending portion 23 is formed on the surface of the fuse sheet 2, and the bending portion 23 is V-shaped. By providing the bending portion 23, the fuse sheet 2 has a certain elasticity, thus having a higher ability to resist pulse shock and mechanical shock.

[0034] A buffer member is provided on the side of the fuse sheet 2. The buffer member includes two bending portions 23 and a discharge hole 21 provided between the two bending portions 23. Two adjacent buffer members are provided in the middle of the fuse sheet 2, and only two discharge holes 21 are provided between the two buffer members. Four discharge holes 21 are provided between the buffer member in the middle of the fuse sheet 2 and other buffer members. This design makes the middle of the fuse sheet 2 have more dense bending portions 23, which can improve the ability of the middle of the fuse sheet 2 to resist pulse shock and mechanical shock.

[0035] In this embodiment, a first connection portion 24 is provided at one end of the fuse sheet 2, and a second connection portion 25 is provided at the other end of the fuse sheet 2. The first connection portion 24 is used to connect with the first inner cap 5 or the first outer cap 3, and the second connection portion 25 is used to connect with the second inner cap 6 or the second outer cap 4. Both the first connection portion 24 and the second connection portion 25 are sheet-like structures, increasing the connection area between the fuse sheet 2 and the inner cap or the outer cap, facilitating the welding of the fuse sheet 2 and the inner cap or the outer cap.

[0036] In this embodiment, the inside of the tube body 1 is filled with an arc extinguishing material 7, and the arc extinguishing material 7 wraps the surface of the fuse sheet 2. The arc extinguishing material 7 can be quartz sand to achieve 50 KA breaking and improve the arc extinguishing effect of the fuse.

[0037] The other structures of this embodiment are the same as those of Embodiment 1 and will not be elaborated here.

[0038] Through the special design of the fuse sheet 2, that is, by providing the discharge holes 21 and the bending portion 23, the fuse of the present utility model can meet the requirements of withstanding a voltage of 2000Vdc and interrupting a current of 50kA; by using a tube body 1 with a length less than 130mm and adopting a double-slot pressure point structure, the fuse can withstand high voltage and large current without using a special fixing structure, making the volume of the fuse smaller, and the fusing efficiency higher, resulting in lower temperature rise power consumption of the fuse. The fuse sheet 2 is made of silver, and the discharge holes 21 and the narrow diameter 22 are provided on the fuse sheet 2. By designing the total cross-sectional area of the narrow diameter 22, the current density can be controlled. The discharge pitch of the discharge holes 21 is designed to be between 8 and 10mm. By designing the discharge pitch of the fuse sheet 2 and the total cross-sectional area of the fuse sheet 2, the current density can be controlled at an appropriate value and there are enough fracture surfaces to withstand the voltage after fusing, enabling the melt to withstand a DC voltage of 2000V and a large current of 50kA in the tube body 1 with a length less than 130mm, achieving normal interruption without catching fire or arcing.

[0039] The present utility model adopts a design of high voltage, large interruption capacity and small size, which can effectively interrupt high voltage and large current in a smaller space, solving the problem that the existing fuses have a large installation space in a photovoltaic system with limited space; by adopting a double-slot pressure point structure and a closing design, it can quickly and effectively cut off the circuit when the current is too large, avoiding the problems that the existing fuses may not be able to interrupt in time or have insufficient interruption capacity when interrupting high voltage and large current, thus improving the safety of the photovoltaic system.

[0040] Obviously, the utility model includes a tube body, a fuse piece, a first outer cap and a second outer cap. The tube body can be a ceramic tube for placing the fuse piece. The fuse piece can be silver, which will melt when an abnormally high voltage and high current occur, thus playing a role in protecting the circuit. The fuse piece is arranged inside the tube body. The first outer cap is sleeved on one end of the tube body, and the second outer cap is sleeved on the other end of the tube body. One end of the fuse piece is electrically connected to the first outer cap, and the other end of the fuse piece is electrically connected to the second outer cap. Both the first outer cap and the second outer cap are used for electrical connection with external devices. A first fixing groove and a first limiting groove are arranged on the outer side of one end of the tube body. Both the first fixing groove and the first limiting groove are continuous grooves arranged on the outer side of the tube body, that is, annular grooves. A first fixing member is arranged on the side of the first outer cap. One end of the first fixing member is embedded in the first fixing groove, and a part of the side of the first outer cap is embedded in the first limiting groove. The first fixing member is formed by mechanical extrusion of the first outer cap, that is, a pressing point structure, so that the first outer cap can be fixed on the tube body. By mechanically extruding the first outer cap in a circular shape, a part of the first outer cap is embedded in the first limiting groove in a circular shape, that is, a closing and tightening structure, which enhances the fixing effect of the first outer cap on the tube body. One end of the first fixing member of the utility model is embedded in the first fixing groove, and a part of the side of the first outer cap is embedded in the first limiting groove, which can enhance the fixing effect of the first outer cap on the tube body, reduce the risk of the fuse cap coming off due to circuit short circuit, enable it to withstand greater energy, and avoid the problems that the fuse may not be able to break timely or has insufficient breaking ability when breaking high voltage and large current, thus improving the safety of the photovoltaic system.

[0041] According to the disclosure and teaching of the above specification, those skilled in the art of the utility model can also make changes and modifications to the above embodiments. Therefore, the utility model is not limited to the above specific embodiments. Any obvious improvements, substitutions or variations made by those skilled in the art on the basis of the utility model belong to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the utility model.

Claims

1. A fuse with a double-slot pressure point structure, characterized in that: The invention comprises a tube body (1), a fuse (2), a first outer cap (3) and a second outer cap (4), wherein the fuse (2) is arranged in the tube body (1), the first outer cap (3) is sleeved on one end of the tube body (1), and the second outer cap (4) is sleeved on the other end of the tube body (1), one end of the fuse (2) is electrically connected to the first outer cap (3), and the other end of the fuse (2) is electrically connected to the second outer cap (4), a first fixing groove (11) and a first limiting groove (12) are arranged on the outer side of one end of the tube body (1), a first fixing member (31) is arranged on the side of the first outer cap (3), one end of the first fixing member (31) is embedded in the first fixing groove (11), and a side portion of the first outer cap (3) is embedded in the first limiting groove (12).

2. The fuse with a double-slot pressure point structure as claimed in claim 1, characterized in that: A second fixing groove (13) and a second limiting groove (14) are arranged on the outer side of the other end of the tube body (1); a second fixing piece (41) is arranged on the side of the second outer cap (4); one end of the second fixing piece (41) is embedded in the second fixing groove (13); and a side portion of the second outer cap (4) is embedded in the second limiting groove (14).

3. The fuse with a double-slot pressure point structure as claimed in claim 1, characterized in that: A first inner cap (5) is provided at one end of the tube body (1), the first outer cap (3) is sleeved on the outer side of the first inner cap (5), and the first inner cap (5) is electrically connected to the fuse (2) and the first outer cap (3) respectively.

4. The fuse with a double-slot pressure point structure as claimed in claim 1, characterized in that: A second inner cap (6) is provided at one end of the tube body (1), the second outer cap (4) is sleeved on the outer side of the second inner cap (6), and the second inner cap (6) is electrically connected to the fuse (2) and the second outer cap (4) respectively.

5. The fuse with a double-slot pressure point structure according to any one of claims 1 to 4, characterized in that: The interior of the tube body (1) is filled with arc-extinguishing material (7), and the arc-extinguishing material (7) is wrapped around the surface of the fuse (2).

6. The fuse with a double-slot pressure point structure according to any one of claims 1 to 4, characterized in that: The surface of the melting piece (2) has at least one row of holes (21).

7. The fuse with a double-slot pressure point structure as claimed in claim 6, characterized in that: A narrow diameter (22) is provided between adjacent holes in the row of holes (21).

8. The fuse with a double-slot pressure point structure as claimed in claim 6, characterized in that: The distance between adjacent rows of holes (21) is 8 mm to 10 mm.

9. The fuse with a double-slot pressure point structure according to any one of claims 1 to 4, characterized in that: At least one bending portion (23) is formed on the surface of the melting piece (2).

10. The fuse with a double-slot pressure point structure according to any one of claims 1 to 4, characterized in that: A first connection portion (24) is provided at one end of the fuse (2), and a second connection portion (25) is provided at the other end of the fuse (2).

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