Fuse

Abstract

The utility model relates to the technical field of circuit protection, in particular to a fuse which comprises a first plug and a second plug, the first plug comprises a first shell and a first conductive part, the first shell is internally provided with an accommodating space, and the first conductive part penetrates through the first shell and extends into the accommodating space; the second plug comprises a second shell, a second conductive part, a fusing column and an elastic conductive part, and the second conductive part penetrates through the second shell and is electrically connected with the fusing column through the elastic conductive part; the first plug is detachably connected with the second plug, and when the first plug is connected with the second plug, the elastic conductive piece enables the fusing column to abut against the first conductive piece. According to the technical scheme, the problem of poor contact between the fusing column in the fuse and the wire in the prior art can be effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of circuit protection, and in particular to a fuse. Background Art

[0002] A fuse is an electrical appliance that uses the heat generated by itself to melt the fuse and disconnect the circuit when the current exceeds the specified value. It is widely used in the field of circuit protection.

[0003] At present, fuses are generally installed on the path of the wire. The fuse generally includes a first plug and a second plug. The first plug and the second plug are connected to the wire respectively, and a fuse column connected to the wire is arranged between the first plug and the second plug. When the current in the circuit exceeds the specified value, the fuse column melts, thereby protecting the circuit.

[0004] However, since the fuse column needs to be replaced frequently, the first plug and the second plug also need to be frequently plugged in and out, which may easily cause poor contact between the fuse column and the wire, thus affecting the stability of the circuit. Utility Model Content

[0005] The present application provides a fuse to solve the problem of poor contact between a fuse post and a wire in a fuse in the related art.

[0006] The present application provides a fuse, comprising:

[0007] A first plug, the first plug comprising a first shell and a first conductive member, the first shell having a receiving space therein, the first conductive member passing through the first shell and extending into the receiving space;

[0008] The second plug includes a second housing, a second conductive member, a fuse column and an elastic conductive member, wherein the second conductive member is disposed through the second housing and is electrically connected to the fuse column through the elastic conductive member;

[0009] The first plug is detachably connected to the second plug. When the first plug is connected to the second plug, the elastic conductive member causes the fuse column to abut against the first conductive member.

[0010] In some embodiments, the elastic conductive member includes a spring, a first end of the spring is fixedly connected to the second conductive member, and a second end of the spring is abutted against the fuse column.

[0011] In some embodiments, the elastic conductive member includes a metal spring, a first end of the metal spring is fixedly connected to the second conductive member, and a second end of the metal spring is abutted against the fuse column.

[0012] In some embodiments, the second plug further includes a limiting sleeve, which is disposed in the second shell and located on the circumferential outer side of the elastic conductive member and the fuse column.

[0013] In some embodiments, the first end of the limiting sleeve is connected to the second conductive member and / or the second shell, and the second end of the limiting sleeve extends into the accommodating space and extends to the first conductive member.

[0014] In some embodiments, the first end of the second conductive member is located in the second shell and fixedly connected to the elastic conductive member, and the second end of the second conductive member passes through the second shell.

[0015] In some embodiments, the second conductive member includes a second wire and a second conductive terminal disposed at an end of the second wire, the second conductive terminal has a second connecting surface fixedly connected to the elastic conductive member, and the area of ​​the second connecting surface is larger than the cross-sectional area of ​​the second wire.

[0016] In some embodiments, a second through hole is provided on the second shell, and the second end of the second conductive member passes through the second through hole and out of the second shell. The fuse further includes a second sealing member that seals the second through hole and the second conductive member.

[0017] In some embodiments, the second shell includes a cylinder and a closing portion arranged at one end of the cylinder, the second through hole is arranged at the closing portion, and the second sealing member is sleeved on the second conductive member and has an interference fit with the inner wall of the closing portion.

[0018] In some embodiments, a first plug-in portion is disposed on the first shell, and a second plug-in portion is disposed on the second shell, and the first plug-in portion is detachably connected to the second plug-in portion.

[0019] The fuse provided in the present application includes a first plug and a second plug that are detachably connected. Specifically, the first plug includes a first housing and a first conductive member, the first housing has a storage space, the first conductive member is inserted into the first housing and extends into the storage space, and the first conductive member is used to connect the first plug to the circuit so that current can flow into the first plug. The second plug includes a second housing, and a second conductive member is arranged in the second housing, and the second conductive member is used to connect the second plug to the circuit so that current can flow into the second plug. When the first plug and the second plug are plugged in, the fuse column and other structures on the second plug can extend into the storage space and contact the first conductive member in the storage space, thereby realizing the conduction of current between the first plug and the second plug. In order to improve the connection stability between the fuse column and the first conductive member, an elastic conductive member is arranged in the second housing, and the second conductive member is electrically connected to the fuse column through the elastic conductive member. When the first plug is connected to the second plug, the elastic conductive member abuts the fuse column against the first conductive member, thereby realizing a close connection between the fuse column and the first conductive member, reducing the probability of poor contact between the fuse column and the first conductive member, thereby reducing the risk of heating at the contact between the fuse column and the first conductive member. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0021] Figure 1 A schematic diagram of the structure of a fuse provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of a first plug of a fuse provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of the second plug of the fuse provided in an embodiment of the present application.

[0024] Description of reference numerals:

[0025] 10. Fuse;

[0026] 100. first plug; 101. accommodating space;

[0027] 110. first housing; 111. bayonet;

[0028] 120, a first conductive member; 121, a first conductive wire; 122, a first conductive terminal;

[0029] 130, a first sealing member;

[0030] 200, second plug;

[0031] 210, second housing; 211, buckle; 212, cylinder; 213, closing portion;

[0032] 220, second conductive member; 221, second conductive wire; 222, second conductive terminal;

[0033] 230. Elastic conductive member;

[0034] 240, fuse column;

[0035] 250, second sealing member;

[0036] 260. Limiting sleeve. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0038] A fuse is an electrical device used to protect circuits and electrical equipment from short circuits and overloads. According to the definition of the IEC127 standard, a fuse is also called a "fuse link", which is usually connected in series in the circuit to be protected. When a short circuit or severe overload occurs in the circuit, the fuse link in the fuse will automatically melt and play a protective role.

[0039] The working principle of the fuse is based on the heat generated when current passes through a conductor. When current passes through the fuse's fuse element, the fuse element will generate heat, and the amount of heat generated depends on the magnitude of the current and the time it passes through. The design and installation of the fuse determine the speed at which the heat is dissipated. If the heat generation rate is less than the heat dissipation rate, the fuse will not blow; if the heat generation rate is equal to the heat dissipation rate, the fuse will not blow for a considerable period of time; only when the heat generation rate is greater than the heat dissipation rate will the fuse blow, thereby protecting the circuit.

[0040] Specifically, in a photovoltaic power plant, an appropriate amount of photovoltaic modules are connected in series through photovoltaic connection plugs to form a photovoltaic string. The photovoltaic string is connected to the combiner box fuse and sent to the inverter to complete the DC-AC conversion. In the prior art, when a positive and negative short circuit occurs at the string outlet, the combiner box fuse can be blown to protect the equipment above the combiner box from being affected.

[0041] However, since the fuse column needs to be replaced frequently, the first plug and the second plug also need to be frequently plugged in and out, resulting in loose contact between the first plug and the second plug, and thus poor contact between the fuse column and the wire, affecting the stability of the circuit.

[0042] In view of this, the present application provides a fuse, which increases the tightness of the abutment between the fuse column and the wire by arranging an elastic conductive member between the first plug and the second plug, thereby solving the problem of poor contact between the fuse column and the wire in the fuse in the related art.

[0043] The fuse provided in the embodiments of the present application is described below with reference to the accompanying drawings.

[0044] It should be noted that the fuse provided in the embodiment of the present application can be used in photovoltaic power plants, wind power plants and other occasions, and can also be used in other occasions requiring current overload protection, and this embodiment does not limit this.

[0045] Figure 1 A schematic diagram of the structure of a fuse provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of a first plug of a fuse provided in an embodiment of the present application; Figure 3 A schematic diagram of the structure of the second plug of the fuse provided in an embodiment of the present application.

[0046] like Figures 1 to 3 As shown, the fuse 10 of this embodiment includes: a first plug 100 and a second plug 200 .

[0047] The first plug 100 includes a first shell 110 and a first conductive member 120 . The first shell 110 has a receiving space 101 therein. The first conductive member 120 penetrates the first shell 110 and extends into the receiving space.

[0048] The second plug 200 includes a second housing 210 , a second conductive member 220 , a fuse column 240 and an elastic conductive member 230 . The second conductive member 220 is disposed through the second housing 210 and is electrically connected to the fuse column 240 through the elastic conductive member 230 .

[0049] The first plug 100 and the second plug 200 are detachably connected. When the first plug 100 and the second plug 200 are connected, the elastic conductive member 230 causes the fuse column 240 to abut against the first conductive member 120 .

[0050] Applying the technical solution of this embodiment, the fuse 10 includes a detachably connected first plug 100 and a second plug 200. Specifically, the first plug 100 includes a first housing 110 and a first conductive member 120. The first housing 110 has a receiving space 101. The first conductive member 120 is disposed in the first housing 110 and extends into the receiving space 101. The first conductive member 120 is used to connect the first plug 100 to a circuit so that current can flow into the first plug 100.

[0051] The second plug 200 includes a second housing 210, in which a second conductive member 220 is disposed, and the second conductive member 220 is used to connect the second plug 200 to a circuit so that current can flow into the second plug 200. When the first plug 100 and the second plug 200 are plugged in and matched, the fuse column 240 and other structures on the second plug 200 can extend into the accommodation space 101 and contact the first conductive member 120 in the accommodation space 101, thereby achieving current conduction between the first plug 100 and the second plug 200.

[0052] In order to improve the connection stability between the fuse column 240 and the first conductive member 120, an elastic conductive member 230 is disposed in the second housing 210, and the second conductive member 220 is electrically connected to the fuse column 240 through the elastic conductive member 230. When the first plug 100 is connected to the second plug 200, the elastic conductive member 230 abuts the fuse column 240 against the first conductive member 120, thereby achieving a tight connection between the fuse column 240 and the first conductive member 120, reducing the probability of poor contact between the fuse column 240 and the first conductive member 120, thereby reducing the risk of heat generation at the contact point between the fuse column 240 and the first conductive member 120.

[0053] It should be noted that the use of the elastic conductive member 230 to abut the fuse column 240 against the first conductive member 120 can also enable the fuse to be compatible with different types of fuse columns 240. For example, when the lengths of different types of fuse columns 240 are different, due to the setting of the elastic conductive member 230, fuse columns 240 of different lengths can be compatible and arranged in the second housing 210.

[0054] It should also be noted that, since the first plug 100 and the second plug 200 are detachably connected, when one of them is damaged, it can be replaced without affecting the other, which facilitates the replacement and maintenance of the fuse.

[0055] Furthermore, if Figures 1 to 3 As shown, in some embodiments, the elastic conductive member 230 includes a spring, a first end of the spring is fixedly connected to the second conductive member 220 , and a second end of the spring is abutted against the fuse column 240 .

[0056] In the above structure, the spring has a simple structure and low cost, and the spring is made of metal, which can ensure the current passing capacity between the fuse column 240 and the second conductive member 220. When the first plug 100 and the second plug 200 are in an unconnected state, the spring is in an uncompressed state. When the first plug 100 and the second plug 200 are in a plugged state, the fuse column 240 is tightly connected to the first conductive member 120, and the spring is in a compressed state, so that the first plug 100 and the second plug 200 can be smoothly buckled.

[0057] Of course, in some embodiments, the elastic conductive member 230 may also include a metal spring, a first end of the metal spring is fixedly connected to the second conductive member 220 , and a second end of the metal spring is abutted against the fuse column 240 .

[0058] On one hand, the metal spring piece can ensure the current passing capacity between the fuse column 240 and the second conductive member 220 . On the other hand, the metal spring piece is elastic and can also achieve the effect of abutting the fuse column 240 against the first conductive member 120 .

[0059] like Figures 1 to 3 As shown, in some embodiments, the second plug 200 further includes a limiting sleeve 260 , which is disposed in the second housing 210 and located on the circumferential outer side of the elastic conductive member 230 and the fuse column 240 .

[0060] In the above structure, the limiting sleeve 260 can limit the fuse column 240 to prevent the fuse column 240 and the first conductive member 120 from being misaligned, thereby reducing the contact area between the fuse column 240 and the first conductive member 120 and causing poor contact between the two.

[0061] Specifically, the limiting sleeve 260 can block the circumferential outer side of the elastic conductive part 230 and the fuse column 240. Even if the fuse column 240 is displaced under the action of the elastic conductive part 230, the setting of the limiting sleeve 260 can ensure that the fuse column 240 and the first conductive part 120 have a sufficiently large base area, thereby ensuring that the current can flow smoothly between the fuse column 240 and the first conductive part 120.

[0062] Specifically, Figures 1 to 3 As shown, in some embodiments, the first end of the limiting sleeve 260 is connected to the second conductive member 220 , and the second end of the limiting sleeve extends into the accommodating space and extends to the first conductive member 120 , thereby ensuring the contact area between the fuse column 240 and the first conductive member 120 .

[0063] Of course, in some embodiments, the limiting sleeve 260 may also be disposed on the second shell 210 , or the limiting sleeve 260 may be disposed on both the second shell 210 and the second conductive member 220 .

[0064] Furthermore, if Figures 1 to 3 As shown, in some embodiments, the first end of the second conductive member 220 is located in the second shell 210 and fixedly connected to the elastic conductive member 230, and the second end of the second conductive member 220 passes through the second shell 210 and is connected to the circuit, thereby achieving conduction between the second plug 200 and the circuit.

[0065] Accordingly, in some embodiments, the first end of the first conductive member 120 is located in the first shell 110 and abuts against the fuse column 240. The first end of the first conductive member 120 passes through the first shell 110 and is connected to the circuit, thereby achieving conduction between the first plug 100 and the circuit.

[0066] like Figures 1 to 3 As shown, in some embodiments, the second conductive member 220 includes a second wire 221 and a second conductive terminal 222 arranged at the end of the second wire 221, and the second conductive terminal 222 has a second connecting surface fixedly connected to the elastic conductive member 230, and the area of ​​the second connecting surface is larger than the cross-sectional area of ​​the second wire 221.

[0067] Such a configuration can increase the contact area between the second conductive member 220 and the elastic conductive member 230 , thereby making the fuse have a greater current-passing capacity.

[0068] Accordingly, in some embodiments, the first conductive member 120 includes a first wire 121 and a first conductive terminal 122 arranged at the end of the first wire 121, the first conductive terminal 122 has a first connecting surface that abuts against the fuse column 240, and the area of ​​the first connecting surface is larger than the cross-sectional area of ​​the first wire 121, so that the first conductive member 120 and the fuse column 240 have a larger contact area.

[0069] like Figures 1 to 3 As shown, in some embodiments, a second through hole is provided on the second shell 210 , and the second end of the second conductive member 220 passes through the second through hole and out of the second shell 210 . The fuse 10 further includes a second sealing member 250 that seals the second through hole and the second conductive member 220 .

[0070] In the above structure, the second sealant 250 can not only seal the gap between the second through hole and the second conductive member 220, but also prevent the second conductive member 220 from shaking, thereby reducing the probability of the second conductive member shaking in the second shell, so that the conductive path in the fuse can be stably connected and matched.

[0071] Accordingly, in some embodiments, a first through hole is provided on the first shell 110, and the first end of the first conductive member 120 passes through the first conductive hole and out of the first shell 110. The fuse 10 also includes a first seal 130 for sealing the first through hole and the first conductive member 120. The first seal 130 has the same function as the second seal 250 and will not be repeated here.

[0072] Specifically, Figures 1 to 3 As shown, in some embodiments, the second shell 210 includes a cylinder 212 and a closing portion 213 arranged at one end of the cylinder 212, the second through hole is arranged at the closing portion 213, and the second sealing member 250 is sleeved on the second conductive member 220 and is interference fit with the inner wall of the closing portion 213.

[0073] It should be noted that the second sealing member 250 is conformably matched to the inner wall of the closing portion 213 and is connected in the closing portion by interference fit, thereby ensuring the sealing effect while ensuring the fixing effect of the second conductive member 220 .

[0074] It should be noted that the second sealing member 250 may include a sealing ring and a plurality of conical sealing bodies arranged on the sealing ring. Specifically, the sealing ring includes a first annular surface and a second annular surface arranged opposite to each other, wherein the first annular surface is arranged close to the first plug 100, and the second annular surface is arranged away from the first plug 100. A plurality of conical sealing bodies are arranged on the second annular surface, and the plurality of conical sealing bodies are arranged in a circumferential direction of the second annular surface. The cross-sectional area of ​​each conical sealing body gradually decreases in the direction from the first annular surface to the second annular surface. When the second sealing member 250 is installed in the closing portion 213, the tips of the plurality of conical sealing bodies gather together to form a conical structure that conforms to the inside of the closing portion. The through hole in the middle of the sealing ring is used to pass through the second conductive member 220, so as to achieve the function of sealing and fixing the second conductive member.

[0075] In some embodiments, the structure of the first sealing member 130 may be the same as that of the second sealing member 250 , which will not be described in detail herein.

[0076] like Figures 1 to 3 As shown, in some embodiments, a first plug-in portion is disposed on the first shell 110, and a second plug-in portion is disposed on the second shell 210, and the first plug-in portion and the second plug-in portion are detachably connected.

[0077] In the above structure, one of the first plug-in portion and the second plug-in portion may be a buckle, and the other may be a bayonet, and the buckle may extend into the bayonet to achieve a detachable connection between the first plug and the second plug.

[0078] Exemplarily, a bayonet 111 may be provided on the first shell 110 , and a buckle 211 may be provided on the second shell 210 . The buckle 211 is inserted into the bayonet 111 to achieve connection between the first plug 100 and the second plug 200 .

[0079] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0080] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0081] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the application described herein can be implemented in an order other than those illustrated or described herein, for example.

[0082] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0083] Finally, it should be noted that the above implementation modes are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned implementation modes, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned implementation modes can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the implementation modes of the present application.

Claims

1. A fuse, characterized in that: include: A first plug, the first plug comprising a first shell and a first conductive member, the first shell having a receiving space therein, the first conductive member passing through the first shell and extending into the receiving space; The second plug comprises a second housing, a second conductive member, a fuse column and an elastic conductive member, wherein the second conductive member is inserted through the second housing and is electrically connected to the fuse column through the elastic conductive member; The first plug is detachably connected to the second plug. When the first plug is connected to the second plug, the elastic conductive member causes the fuse column to abut against the first conductive member.

2. The fuse according to claim 1, characterized in that: The elastic conductive member comprises a spring, a first end of the spring is fixedly connected to the second conductive member, and a second end of the spring is abutted against the fuse column.

3. The fuse according to claim 1, characterized in that: The elastic conductive member comprises a metal spring sheet, a first end of the metal spring sheet is fixedly connected to the second conductive member, and a second end of the metal spring sheet is abutted and matched with the fuse column.

4. The fuse according to claim 2 or 3, characterized in that: The second plug further comprises a limiting sleeve, which is arranged in the second housing and located outside the elastic conductive member and the fuse column in the circumferential direction.

5. The fuse according to claim 4, characterized in that: The first end of the limiting sleeve is connected to the second conductive member and / or the second shell, and the second end of the limiting sleeve extends into the accommodating space and to the first conductive member.

6. The fuse according to any one of claims 1 to 3, characterized in that: The first end of the second conductive member is located in the second shell and fixedly connected to the elastic conductive member, and the second end of the second conductive member passes through the second shell.

7. The fuse according to claim 6, characterized in that: The second conductive member includes a second wire and a second conductive terminal arranged at an end of the second wire, the second conductive terminal has a second connecting surface fixedly connected to the elastic conductive member, and the area of ​​the second connecting surface is larger than the cross-sectional area of ​​the second wire.

8. The fuse according to any one of claims 1 to 3, characterized in that: The second housing is provided with a second through hole, and the second end of the second conductive member passes through the second through hole and out of the second housing. The fuse further includes a second sealing member for sealing the second through hole and the second conductive member.

9. The fuse according to claim 8, characterized in that: The second shell includes a cylinder and a closing portion arranged at one end of the cylinder, the second through hole is arranged at the closing portion, and the second sealing member is sleeved on the second conductive member and is interference fit with the inner wall of the closing portion.

10. The fuse according to any one of claims 1 to 3, characterized in that: The first shell is provided with a first plug-in portion, and the second shell is provided with a second plug-in portion, and the first plug-in portion is detachably connected to the second plug-in portion.

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