High-voltage fuse for photovoltaic system

Abstract

The invention relates to the technical field of fuses, and discloses a high-voltage fuse for a photovoltaic system, which comprises a shell and a fusion tube arranged in the shell, the fusion tube comprises a tube body and a fuse wire arranged in the tube body, the tube body is filled with an arc extinguishing medium, the tube body is provided with a plurality of guide bulges distributed around the circumference of the central axis of the tube body, and the guide bulges are arranged in the shell. Each guide protrusion comprises an inner protrusion located inside the tube body and an outer protrusion located outside the tube body, the outer protrusions and the inner protrusions are in one-to-one correspondence and extend synchronously, the inner protrusions divide the space in the tube body into a plurality of cavities, the cavities are filled with the arc extinguishing media, the inner protrusions are used for separating the arc extinguishing media, and the arc extinguishing media are filled with the arc extinguishing media. The outer protrusions serve as auxiliary positioning structures of the pipe body and the shell.

Description

Technical Field

[0001] This invention relates to the field of fuse technology, specifically a high-voltage fuse for photovoltaic systems. Background Technology

[0002] With the continuous expansion of photovoltaic (PV) installed capacity, high-voltage fuses, as key protection devices on the DC side of PV systems, are widely used in PV strings, combiner boxes, and inverters. Their core function is to quickly melt the fuse and cut off the circuit when abnormal conditions such as short circuits or overloads occur, preventing the fault from escalating and ensuring the safe and stable operation of the PV system. Unlike traditional AC fuses, high-voltage fuses for PV systems need to operate for extended periods under high DC voltage and complex outdoor environments (high temperature, high humidity, and strong vibration), placing higher demands on their structural stability, arc-extinguishing performance, and mechanical strength.

[0003] Currently, the core structure of existing high-voltage fuses in photovoltaic systems typically includes a shell, fuse tube, fuse wire, and arc-extinguishing medium. The fuse tube is the core component that carries the fuse wire and the arc-extinguishing medium. The arc-extinguishing medium (often high-purity silica sand, etc.) fills the inside of the fuse tube and is used to absorb arc energy and cool the arc when the fuse wire melts, achieving reliable arc extinguishing and preventing arc reignition that could cause equipment damage or safety accidents. However, the existing fuse tube structure design has many shortcomings and cannot meet the requirements of photovoltaic systems under high-voltage operating conditions. The main technical problems are as follows: Firstly, the fuse tube is mostly a smooth cylindrical structure with insufficient bending strength. During outdoor installation and transportation of photovoltaic power stations, the fuse tube is easily affected by external impacts or vibrations, resulting in deformation, cracking, and other problems. At the same time, when the fuse wire melts and generates a high-temperature arc, a large arc-extinguishing gas pressure and electrodynamic force are generated inside the tube, further aggravating the damage to the tube and even causing the fuse tube to burst, affecting the normal operation and service life of the fuse.

[0004] Secondly, the arc-extinguishing medium inside the fuse tube is mostly a monolithic filling without an effective separating structure. During the transportation, installation, or long-term operation of the fuse, factors such as vibration and tilting can easily cause the arc-extinguishing medium to stratify and slide, resulting in uneven distribution of the medium within the tube. This not only reduces the contact area between the arc-extinguishing medium and the inner wall of the tube, affecting the heat conduction efficiency of the arc, but also leads to unstable arc-extinguishing performance. When a circuit fault occurs, it cannot quickly and reliably extinguish the arc, potentially causing the fault to escalate and affecting the safe operation of the photovoltaic system.

[0005] Third, the positioning structure design between the fuse tube and the housing is inadequate. Existing fuse tubes and housings are mostly positioned solely by end structures, lacking effective auxiliary positioning mechanisms, resulting in poor connection stability. Under conditions such as strong outdoor winds and equipment vibration, the fuse tube is prone to shifting or loosening within the housing. This not only affects the reliability of the contact between the fuse wire and the circuit contacts but may also exacerbate tube wear due to tube movement, further shortening the fuse's lifespan and even posing safety hazards.

[0006] In summary, given the technical problems of insufficient bending strength of the fuse tube, easy delamination and slippage of the arc extinguishing medium, and poor stability of the connection between the fuse tube and the shell in existing high-voltage fuses for photovoltaic systems, there is an urgent need for a structurally optimized high-voltage fuse to improve its operational reliability and service life, and to meet the protection requirements of photovoltaic systems under high voltage and complex operating conditions. Summary of the Invention

[0007] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a high-voltage fuse for photovoltaic systems. By setting circumferentially distributed guide protrusions on the fuse tube body, it can improve the bending strength of the tube body, separate the arc-extinguishing medium to prevent its delamination and slippage, increase the contact area to accelerate arc heat dissipation, and improve the connection stability between the fuse tube and the shell through external protrusions for auxiliary positioning. In this way, it can improve the operational reliability and service life of the fuse, solve the problems of insufficient bending strength of the fuse tube, easy delamination and slippage of the arc-extinguishing medium, poor connection stability between the fuse tube and the shell, and difficulty in meeting the use requirements of high voltage and complex outdoor conditions of photovoltaic systems.

[0008] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: A high-voltage fuse for a photovoltaic system includes a housing and a fuse tube disposed within the housing. The fuse tube includes a tube body and a fuse wire disposed within the tube body. The tube body is filled with an arc-extinguishing medium. The tube body is provided with a plurality of guide protrusions circumferentially distributed around the central axis of the tube body. Each guide protrusion includes an inner protrusion located inside the tube body and an outer protrusion located outside the tube body. The outer protrusions correspond one-to-one with the inner protrusions and extend synchronously. The inner protrusions divide the internal space of the tube body into multiple chambers. The arc-extinguishing medium is filled in the multiple chambers. The inner protrusions are used to separate the arc-extinguishing medium. The outer protrusions serve as an auxiliary positioning structure between the tube body and the housing.

[0009] Preferably, each guide protrusion is an integral structure with the tube body.

[0010] Preferably, each guide protrusion and tube body is a separate structure.

[0011] Preferably, the guide protrusion is provided with an exhaust channel. The inlet of the exhaust channel is located on the inner protrusion near the fuse, and the outlet of the exhaust channel is located outside the outer protrusion. A guide sleeve is provided inside the housing, and the guide sleeve wraps around the outside of the channel outlet. Each guide protrusion is provided with a corresponding exhaust channel, and the number of exhaust channels is the same as the number of guide protrusions, forming a uniformly distributed exhaust system. The exhaust channel runs through the outer and inner protrusions, forming a complete exhaust path with the inner cavity of the tube and the guide sleeve.

[0012] Preferably, the exhaust channel is configured in the shape of a flared mouth, with a gradually changing structure that is wider at the inside and narrower at the outside. The exhaust channel is wider closer to the inlet and narrower closer to the outlet. The inlet of the channel is expanding and the outlet of the channel is contracting.

[0013] Preferably, the guide sleeve includes two independent semi-rings, which are respectively fixedly installed on two housings.

[0014] Preferably, a pair of symmetrical positioning blocks are provided on the inner wall of the guide sleeve corresponding to the position of each external protrusion. The positioning blocks are used to support the external protrusion and realize the positioning function.

[0015] Preferably, the guide protrusion is a triangular shape that is wider on the inside and narrower on the outside.

[0016] Preferably, the innermost ends of each channel entrance are located on the same elliptical arc, and each guide protrusion is evenly distributed around the tube.

[0017] Preferably, the fuse tube is provided with end caps at both ends, the end caps are wrapped around the two ends of the tube body, and the end caps at both ends are respectively fixed with terminals by screws. The fuse is electrically connected to the end caps and terminals, and the terminals at both ends are fixed with and electrically connected to the terminals by screws. The terminals are fixedly installed inside the housing.

[0018] (III) Beneficial Effects Compared with the prior art, the present invention provides a high-voltage fuse for photovoltaic systems, which has the following advantages: 1. This high-voltage fuse for photovoltaic systems, by setting multiple guide protrusions, can not only improve the bending strength of the tube body, but also use the inner protrusions to separate the arc extinguishing medium, preventing the arc extinguishing medium from delamination and slippage. It also increases the contact area between the arc extinguishing medium and the inner wall of the tube body, accelerating the conduction of arc heat. The outer protrusions can serve as an auxiliary positioning structure between the tube body and the shell, initially improving the connection stability between the fuse tube and the shell.

[0019] 2. This high-voltage fuse for photovoltaic systems, based on the guide protrusion, achieves multiple beneficial effects by integrating an exhaust channel within the guide protrusion. First, the channel inlet is close to the fuse melting point, directly capturing high-pressure gas without long-distance gas diffusion, shortening the exhaust path. Simultaneously, multiple evenly distributed exhaust channels exhaust gas synchronously, effectively mitigating sudden pressure increases within the tube and preventing fuse tube rupture. Second, the exhaust channel effectively blocks arc-extinguishing medium particles from passing through, ensuring no leakage of the medium during exhaust. Finally, the channel outlet faces the guide sleeve, guiding high-pressure gas out orderly along the guide sleeve, preventing turbulent gas flow from impacting the tube body, terminals, and casing. Rapid exhaust prevents arc leakage caused by excessive internal pressure, while directional exhaust prevents high-pressure gas from impacting other components of the photovoltaic system, reducing safety hazards.

[0020] 3. This high-voltage fuse for photovoltaic systems expands the gas capture range and reduces the resistance of gas entering the channel by setting the exhaust channel in a funnel shape, thus solving the problem of sudden pressure rise inside the pipe. At the same time, the internally expanding channel inlet can exert a squeezing force on the surrounding arc-extinguishing medium to prevent the medium from sliding, while the externally contracting channel outlet can prevent external water vapor from entering.

[0021] 4. This high-voltage fuse for photovoltaic systems features a separate design for the tube body and the guide protrusion. After assembly, the pressure generated by the arc-extinguishing medium inside the tube body can push the guide protrusion outward. Since the guide protrusion is a triangular shape that is wider on the inside and narrower on the outside, the outward compression of the guide protrusion can enhance the sealing between the guide protrusion and the tube body. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention.

[0023] Figure 2 This is an exploded view of Embodiment 1 of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure after removing the shell in Embodiment 1 of the present invention.

[0025] Figure 4 This is a schematic diagram of the fusion tube structure according to Embodiment 1 of the present invention.

[0026] Figure 5 This is a cross-sectional view of the fusion tube and guide sleeve according to Embodiment 1 of the present invention.

[0027] Figure 6 This is a front view of the fusion tube according to Embodiment 1 of the present invention, with auxiliary lines marking the inside.

[0028] Figure 7 This is a cross-sectional view of the fusion tube according to Embodiment 2 of the present invention.

[0029] Figure 8This is an exploded view of the fusion tube of Embodiment 2 of the present invention.

[0030] Figure 9 This is a schematic diagram of the guide protrusion in Embodiment 2 of the present invention.

[0031] Figure 10 This is a front view of the guide protrusion in Embodiment 2 of the present invention.

[0032] In the diagram: 1. Shell; 2. Terminals; 3. Fusible tube; 31. Tube body; 311. Arc extinguishing medium; 32. End cap; 33. Fusible wire; 34. Terminal; 35. Guide protrusion; 351. Outer protrusion; 352. Inner protrusion; 353. Exhaust channel; 3531. Channel inlet; 3532. Channel outlet; 4. Guide sleeve; 41. Positioning block. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] In the description of this invention, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0035] In addition, a fixed connection refers to a connection in which parts or components are fixed and there is no relative movement; a transmission connection refers to a connection in which mechanical motion or torque is transmitted to other working parts through a transmission component; a sliding connection refers to a connection in which two objects are in contact but not fixed and can slide relative to each other; and a rotational connection refers to a connection in which two objects are in contact but not fixed and can rotate relative to each other.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] Example 1: like Figures 1 to 6 As shown, this embodiment provides a high-voltage fuse for a photovoltaic system, such as... Figure 1 and Figure 2 As shown, it includes a housing 1 and a fusible tube 3 disposed within the housing 1. The fusible tube 3 includes a tube body 31 and a fusible wire 33 disposed within the tube body 31. The tube body 31 is filled with an arc-extinguishing medium 311. Figure 4 As shown, the tube body 31 is provided with a plurality of guide protrusions 35 circumferentially distributed around the central axis of the tube body 31, such as Figure 5 As shown, each guide protrusion 35 is an integral structure with the tube body 31. Each guide protrusion 35 includes an inner protrusion 352 located inside the tube body 31 and an outer protrusion 351 located outside the tube body 31. The outer protrusion 351 corresponds to the inner protrusion 352 and extends synchronously. The inner protrusion 352 divides the internal space of the tube body 31 into multiple chambers, and the arc-extinguishing medium 311 is filled in multiple chambers. The inner protrusion 352 is used to separate the arc-extinguishing medium 311. Based on the above technical solution, by setting multiple guide protrusions 35, the bending strength of the tube body 31 can be improved, and the arc-extinguishing medium 311 can be separated by the inner protrusion 352 to prevent the arc-extinguishing medium 311 from delamination and sliding. It can also increase the contact area between the arc-extinguishing medium 311 and the inner wall of the tube body 31, accelerating the conduction of arc heat. The outer protrusion 351 can serve as an auxiliary positioning structure between the tube body 31 and the shell 1, initially improving the connection stability between the fused tube and the shell.

[0038] Body settings, such as Figure 5As shown, the cross-section of the guide protrusion 35 is an isosceles trapezoid. The upper base width of the outer protrusion 351 is 0.8mm and the lower base width is 1mm. The upper base width of the inner protrusion 352 is 1.8mm and the lower base width is 2mm. The angle between the hypotenuse of the trapezoid and the surface of the tube is 45°, which avoids the sharp edges of the protrusion from scratching the arc-extinguishing medium or the shell, and further improves the bending strength of the tube. The top of the outer protrusion 351 is rounded with a radius of 0.2mm to prevent sharp protrusions from piercing the fuse or scratching the inner wall of the tube, while reducing the resistance during arc-extinguishing medium filling and ensuring smoother medium filling. There are 6 guide protrusions 35, and the distance between two adjacent guide protrusions is... The central angle between the two sections is 60° to ensure uniform stress distribution and even separation of the arc-extinguishing medium. It also provides a reasonable spacing for subsequent exhaust channels to prevent interference between them. The pipe wall thickness is 2mm, the overall length is 100-120mm, and the outer diameter is 25-30mm. A transition arc with a radius of 0.3mm is used at the connection between the guide protrusion and the pipe to disperse stress concentration and prevent cracking under vibration or high-temperature conditions. The inner protrusion 352 has a positioning protrusion every 20mm along the pipe axis, with a height of 0.1mm and a diameter of 0.5mm. This further restricts the sliding of the arc-extinguishing medium, ensuring that the medium remains uniform after filling.

[0039] like Figure 5As shown, in some embodiments, unlike a typical fuse tube 3, the exhaust structure of existing photovoltaic high-voltage fuse tubes has obvious defects and cannot meet the requirements for rapid and safe discharge of high-pressure gas. Therefore, the tube body 31 of the present invention is provided with an exhaust channel 353 inside the guide protrusion 35. The channel inlet 3531 of the exhaust channel 353 is located on the inner protrusion 352 near the fuse 33, and the channel outlet 3532 of the exhaust channel 353 is located outside the outer protrusion 351. A guide sleeve 4 is provided inside the housing 1, and the guide sleeve 4 wraps around the outside of the channel outlet 3532. Each guide protrusion 35 is provided with a corresponding exhaust channel 353, and the number of exhaust channels 353 is the same as the number of guide protrusions 35, forming a uniformly distributed exhaust system. The exhaust channel runs through the outer protrusion 351 and the inner protrusion 352, forming a complete exhaust path with the inner cavity of the tube body 31 and the guide sleeve 4. Based on the above technical solution, by integrating an exhaust channel 353 within the guide protrusion 35, multiple beneficial effects are achieved. First, the channel inlet 3531 is close to the melting point of the fuse 33, which can directly capture high-pressure gas without long-distance gas diffusion, shortening the exhaust path. At the same time, multiple evenly distributed exhaust channels 353 exhaust simultaneously, effectively alleviating the sudden increase in pressure inside the pipe and preventing the fuse tube from bursting. Second, the exhaust channel 353 can effectively block the passage of arc-extinguishing medium 311 particles, ensuring that the medium does not leak during the exhaust process. Finally, the channel outlet 3532 faces the guide sleeve 4, which can guide the high-pressure gas to be discharged in an orderly manner along the guide sleeve 4, avoiding gas turbulence impacting the pipe body 31, the terminal 34, and the housing 1. Rapid exhaust can prevent arc leakage caused by excessive pressure inside the pipe, while directional exhaust can prevent high-pressure gas from impacting other components of the photovoltaic system, reducing safety hazards.

[0040] Specific settings, such as Figure 5As shown, the inner wall roughness of the exhaust channel 353 is no more than Ra0.8μm, and the channel is straight without any bends, reducing resistance during gas flow and improving exhaust smoothness, while preventing gas from stagnating in the channel and causing pressure buildup. Furthermore, the channel inlet 3531 has an arc-shaped chamfered structure with a chamfer radius of 0.1mm and an inlet edge width of 0.2mm, which expands the gas capture range, prevents sharp edges from scratching the fuse, and prevents arc-extinguishing medium particles from clogging the inlet. Furthermore, the connection between the channel outlet 3532 and the outer wall of the outer protrusion 351 is beveled with a transition angle of 30° and an outlet width of 0.1mm. In one step, the length of the exhaust channel 353 is consistent with the length of the guide protrusion 35, which is 80-100mm. The channel is parallel to the central axis of the pipe body throughout its length, and the channel wall thickness is 0.3mm to ensure the structural strength of the channel and prevent damage caused by high-pressure gas impact. In another step, the edge of the channel inlet 3531 is passivated with a passivation thickness of 0.05mm to prevent damage or detachment of the inlet edge caused by high-pressure gas impact during exhaust, while also improving the wear resistance of the inlet. In yet another step, the distance between each exhaust channel 353 and the adjacent channel is 15-20mm to ensure that multiple channels do not interfere with each other when exhausting simultaneously, forming a uniform exhaust distribution and avoiding excessive local pressure inside the pipe.

[0041] Specific settings, such as Figure 2 As shown, in this invention, the guide sleeve 4 includes two independent semi-rings, which are respectively fixedly installed on two housings 1. The guide sleeve 4 is fixed to the housing 1 by any one of adhesive bonding, bolting, or heat fusion fixing; Figure 5 The guide sleeve 4 has a pair of symmetrical positioning blocks 41 on the inner wall corresponding to each of the outer protrusions 351. The positioning blocks 41 are used to support the outer protrusions 351 and realize the positioning function.

[0042] like Figure 5 and Figure 6 As shown, in some embodiments, unlike general exhaust structures, the resistance when gas enters the exhaust channel 353 is relatively large, affecting the exhaust speed and failing to fix the surrounding arc-extinguishing medium, which may still result in medium slippage. Furthermore, the channel outlet is connected to the outside, allowing outdoor rainwater, moisture, dust, etc., to easily enter the pipe body through the exhaust channel. Therefore, the exhaust channel 353 of this invention is suitable for... Figure 5As shown, the exhaust channel 353 is configured in a funnel shape with a gradually narrowing structure, wider at the inside and narrower at the outside. The exhaust channel 353 is wider near the inlet 3531 and narrower near the outlet 3532. The inlet 3531 is expanding, and the outlet 3532 is contracting. Based on the above technical solution, by configuring the exhaust channel 353 in a funnel shape, the gas capture range can be expanded, the resistance to gas entering the channel can be reduced, and the problem of sudden pressure rise inside the pipe can be solved. At the same time, the expanding inlet 3531 can exert a squeezing force on the surrounding arc-extinguishing medium 311 to prevent the medium from sliding, and the contracting outlet 3532 can prevent external moisture from entering.

[0043] Specific settings, such as Figure 6 As shown, in some embodiments, when the fuse 33 is a plate-shaped fuse, in order to limit the length of the inner protrusion 352 within the tube 31, so that each exhaust channel 353 can uniformly discharge the high-pressure gas generated at the fuse break position, the plate-shaped fuse 33 applicable to the present invention includes six guide protrusions 35 in any fuse tube 3. The innermost ends b (including b1, b2, b3, b4, b5 and b6) of the six channel inlets 3531 are located on the same elliptical arc c. The six guide protrusions 35 are evenly distributed circumferentially within the tube 31. The central axis a (including a1, a2, a3, a4, a5 and a6) of the six guide protrusions 35 is located on the six bisectors, and the innermost ends b of the six channel inlets 3531 are respectively located on the corresponding central axis a.

[0044] Specific settings, such as Figure 3 and Figure 4 As shown, similar to the prior art, the fuse tube 3 in this invention is also provided with end caps 32 at both ends. The end caps 32 are wrapped around both ends of the tube body 31. The end caps 32 at both ends are respectively fixed with terminals 34 by screws. The fuse 33 is electrically connected to the end caps 32 and terminals 34. The terminals 34 at both ends are fixed with terminals 2 by screws and electrically connected. The terminals 2 are fixedly installed inside the housing 1.

[0045] Example 2: Please see Figure 7-10 This embodiment provides a high-voltage fuse for a photovoltaic system. Unlike Embodiment 1, because integrally molding the tube body 31 and guide protrusions 35 is costly, in this embodiment, each guide protrusion 35' and the tube body 31' are separate structures. Figure 8 As shown, the tube body 31' and each guide protrusion 35' are produced by injection molding respectively, and then assembled together, as follows. Figure 9 and Figure 10As shown, the guide protrusion 35' is a separate part, comprising an integral outer protrusion 351' and an inner protrusion 352'. An exhaust channel 353' is located at the center of the guide protrusion 35', and the exhaust channel 353' is shaped like a flared mouth, wider inside and narrower outside. The guide protrusion 35' is shaped like a triangle, wider inside and narrower outside. Based on the above technical solution, through the separate design of the tube body 31' and the guide protrusion 35', the pressure generated by the arc-extinguishing medium 311' inside the tube body 31' after assembly can push the guide protrusion 35' outward. Since the guide protrusion 35' is shaped like a triangle, wider inside and narrower outside, the outward compression of the guide protrusion 35' can enhance the sealing between the guide protrusion 35' and the tube body 31'.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-voltage fuse for a photovoltaic system, comprising a housing (1) and a fuse tube (3) disposed within the housing (1), the fuse tube (3) comprising a tube body (31) and a fuse wire (33) disposed within the tube body (31), the tube body (31) being filled with an arc-quenching medium (311), characterized in that: The tube body (31) is provided with a plurality of guide protrusions (35) circumferentially distributed around the central axis of the tube body (31). Each guide protrusion (35) includes an inner protrusion (352) located inside the tube body (31) and an outer protrusion (351) located outside the tube body (31). The outer protrusion (351) corresponds to the inner protrusion (352) and extends synchronously. The inner protrusion (352) divides the space inside the tube body (31) into a plurality of chambers. The arc extinguishing medium (311) is filled in the plurality of chambers. The inner protrusion (352) is used to separate the arc extinguishing medium (311). The outer protrusion (351) serves as an auxiliary positioning structure between the tube body (31) and the shell (1).

2. A high-voltage fuse for a photovoltaic system according to claim 1, characterized in that, Each guide protrusion (35) and the tube body (31) are an integral structure.

3. A high-voltage fuse for a photovoltaic system according to claim 1, characterized in that, Each guide protrusion (35) and tube body (31) is a separate structure.

4. A high-voltage fuse for a photovoltaic system according to any one of claims 2 or 3, characterized in that, An exhaust channel (353) is provided inside the guide protrusion (35). The inlet (3531) of the exhaust channel (353) is located on the inner protrusion (352) near the fuse (33). The outlet (3532) of the exhaust channel (353) is located outside the outer protrusion (351). A guide sleeve (4) is provided inside the housing (1). The guide sleeve (4) wraps around the outside of the outlet (3532). Each guide protrusion (35) is provided with an exhaust channel (353). The number of exhaust channels (353) is the same as the number of guide protrusions (35), forming a uniformly distributed exhaust system. The exhaust channel runs through the outer protrusion (351) and the inner protrusion (352) throughout, forming a complete exhaust path with the inner cavity of the tube body (31) and the guide sleeve (4).

5. A high-voltage fuse for a photovoltaic system according to claim 4, characterized in that, The exhaust channel (353) is configured in the shape of a flared mouth and adopts a gradual structure that is wider at the inside and narrower at the outside. The exhaust channel (353) is wider closer to the channel inlet (3531) and narrower closer to the channel outlet (3532). The channel inlet (3531) is in an expanding shape and the channel outlet (3532) is in a contracting shape.

6. A high-voltage fuse for a photovoltaic system according to claim 5, characterized in that, The guide sleeve (4) includes two independent semi-rings, which are respectively fixedly installed on two housings (1).

7. A high-voltage fuse for a photovoltaic system according to claim 6, characterized in that, The inner wall of the guide sleeve (4) is provided with a pair of symmetrical positioning blocks (41) corresponding to the position of each external protrusion (351). The positioning blocks (41) are used to support the external protrusion (351) and realize the positioning function.

8. A high-voltage fuse for a photovoltaic system according to claim 3, characterized in that, The guide protrusion (35) is a triangular shape that is wider on the inside and narrower on the outside.

9. A high-voltage fuse for a photovoltaic system according to claim 7, characterized in that, The innermost ends of each channel entrance (3531) are located on the same elliptical arc, and each guide protrusion (35) is evenly distributed around the circumference of the tube (31).

10. A high-voltage fuse for a photovoltaic system according to any one of claims 1, characterized in that, The fuse tube (3) is provided with end caps (32) at both ends. The end caps (32) are wrapped around the two ends of the tube body (31). The end caps (32) at both ends are respectively fixed with terminals (34) by screws. The fuse (33) is electrically connected to the end caps (32) and terminals (34). The terminals (34) at both ends are fixed with the terminals (2) by screws and electrically connected. The terminals (2) are fixedly installed inside the housing (1).

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