CN219085919U - Overcurrent protector and backup protection device - Google Patents

Abstract

The embodiment of the application provides an overcurrent protector and a backup protection device, and relates to the field of power distribution equipment. The overcurrent protector includes: a housing and a fuse. The shell is provided with a containing cavity. The fuse is arranged in the accommodating cavity and is arranged on the shell. The fuse is configured to blow when the backup protection device is connected with a first current and not to blow when the backup protection device is connected with a second current; the first current is smaller than the second current, and the time of the first current flowing through the fuse is longer than the time of the second current flowing through the fuse. According to the embodiment of the application, the overcurrent protector is arranged to comprise the fuse element, so that the fuse element can be fused when carrying the first current, the first current is prevented from damaging the surge protector, and the fuse element can not be fused when carrying the second current, so that the second current reaches the surge protector and is processed by the surge protector.

Description

Overcurrent protector and backup protection device

Technical Field

The embodiment of the application relates to the technical field of power distribution equipment, in particular to an overcurrent protector and a backup protection device.

Background

With the development of power distribution technology, the requirements of people on the power distribution safety performance of a power distribution system are also increasing. For example, surge protectors are provided in power distribution systems to shunt the surge current when it is entered therein, thereby reducing damage to equipment in the power distribution system from the surge current.

However, in the power distribution system, other types of overload currents (such as short-circuit currents) besides the set currents also damage the devices in the power distribution system, so that on the basis of ensuring functions of different devices, providing a device capable of selectively breaking the circuits of the power distribution system when different currents pass is a problem to be solved.

Disclosure of Invention

In view of the foregoing, embodiments of the present application provide an overcurrent protector and a backup protection device to protect equipment in a power distribution system by selectively breaking a circuit of the power distribution system when different currents pass.

In a first aspect, embodiments of the present application provide an overcurrent protector for a backup protection device. The overcurrent protector includes: a housing and a fuse. The shell is provided with a containing cavity. The fuse is arranged in the accommodating cavity and is arranged on the shell. The fuse is configured to blow when the backup protection device is connected with a first current and not to blow when the backup protection device is connected with a second current; the first current is smaller than the second current, and the time of the first current flowing through the fuse is longer than the time of the second current flowing through the fuse.

According to the embodiment of the application, the overcurrent protector comprises the shell and the fuse element, so that the fuse element can be fused when carrying first current (short-circuit current), the first current is prevented from damaging the surge protector, and the fuse element is not fused when carrying second current, and the second current can conveniently reach the surge protector and is processed by the surge protector; the shell can insulate the fuse element from the external conductive part when the fuse element bears the first current or the second current, so that short circuit caused by electric connection of the fuse element and the external conductive part is avoided, and an electric arc generated at a fusing part can be sealed when the fuse element is fused, so that the external part is prevented from being damaged by the electric arc.

In some embodiments, the fuse has the same shape and the same area in cross-section throughout.

Through the scheme, the fuse can be fused when bearing the first current, and is not fused when bearing the second current, and the whole volume of the fuse can be reduced, so that the volume of the overcurrent protector is reduced.

In some embodiments, the fuse includes a connecting segment and a fusing segment connected, the connecting segment is connected with the housing, and a cross-sectional area S1 of the connecting segment and a cross-sectional area S2 of the fusing segment satisfy: S1/S2 is more than 1 and less than or equal to 1.5.

Through the scheme, firstly, the cross section area of the connecting section is larger than that of the fusing section, so that the fusing section is easy to fuse when carrying the first current, and the connecting section is used for mounting the fusing section on the shell and is not easy to fuse when carrying the first current or the second current; secondly, compared with the connection of the fusing section and the shell, the connection area of the connecting part of the fusing element and the shell is larger, and the fusing element and the shell can be connected more firmly; finally, since S1/S2 is less than or equal to 1.5, although the cross-sectional area of the connecting section is larger than that of the fusing section, the difference between the two cross-sectional areas is smaller, so that the overcurrent protector of the embodiment of the application can properly reduce the volume of the overcurrent protector while ensuring the beneficial effects in the two aspects, and is suitable for different installation spaces.

In some embodiments, the fuse further includes a transition section configured in plurality, the transition section being connected between adjacent two of the fuse sections.

Through above-mentioned scheme, when the fuse inserts first electric current, the possibility that all has the fusing of the fusing section of a plurality of positions is favorable to improving the fusing efficiency of fuse.

In some embodiments, the fuse is configured in a plurality, each fuse mounted to the housing, and the plurality of fuses are connected in parallel.

Through the scheme, when the fuse element bears the second current, the plurality of fuse elements can shunt the second current so as to reduce the possibility of fusing the fuse element when bearing the second current.

In some embodiments, portions of the fuse protrude from an outer surface of the housing.

By the above scheme, in the axis direction of the fuse, the size of the shell can be reduced, and the volume of the overcurrent protector can be further reduced.

In some embodiments, the housing further includes a conductive end cap that is soldered to the fuse.

Through the scheme, the fuse element can be mounted on the shell through the conductive end cover, specifically, the fuse element can be connected with the conductive end cover firstly, then the fuse element and the conductive end cover are mounted on the shell together, and compared with the case that the shell is directly connected with the fuse element, the mounting accuracy can be improved; in addition, when the conductive end cover is in tin soldering connection with the fuse, compared with other welding modes such as spot welding, the contact resistance between the conductive end cover and the fuse can be reduced, and the firmness of physical connection and the stability of electric connection between the conductive end cover and the fuse can be improved.

In some embodiments, a tin bath is provided on the conductive end cap, and a portion of the fuse is located in the tin bath to be soldered to the conductive end cap.

Through the scheme, the tin bath can position the fuse element, so that the fuse element is not easy to slide on the conductive end cover, and the connection area of the conductive end cover and the fuse element is ensured; the tin bath can also limit tin material, so that the flow of the tin material is avoided, and the connection firmness of the conductive end cover and the fuse element is further improved.

In a second aspect, an embodiment of the present application further provides a backup protection device. The backup protection device is used for protecting the surge protector. The backup protection device comprises a housing, a terminal block and the overcurrent protector of the first aspect. The housing has a mounting cavity. The binding post is installed in the shell, and is located the installation cavity at least partially. The overcurrent protector is accommodated in the mounting cavity and is electrically connected with the wiring terminal.

Through the scheme, the wiring terminal can be connected into the first current and the second current and output the second current; the overcurrent protector can be fused when the wiring terminal is connected with the first current so as to disconnect the circuit of the power distribution system and prevent the first current from entering the surge protector and damaging the surge protector; the housing may mount and house the terminal and the overcurrent protector and insulate the terminal, the overcurrent protector from an external conductive member.

In some embodiments, the connection terminals include an incoming terminal and an outgoing terminal; the overcurrent protector comprises a first conductive end cover and a second conductive end cover; the first conductive end cover is connected with the wire inlet terminal in a soldering way; and/or, the second conductive end cover is in tin soldering connection with the wire outlet terminal.

Through above-mentioned scheme, when first electrically conductive end cover and incoming wire terminal tin soldering are connected, and second electrically conductive end cover and outgoing wire terminal tin soldering are connected, the resistance between binding post and the overcurrent protector is littleer, and the reliability of physical connection between the two is higher, and the stability of electricity connection is higher.

The foregoing description is only an overview of the technical solutions of the embodiments of the present application, and may be implemented according to the content of the specification, so that the technical means of the embodiments of the present application can be more clearly understood, and the following detailed description of the present application will be presented in order to make the foregoing and other objects, features and advantages of the embodiments of the present application more understandable.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an overcurrent protector according to an embodiment of the present application.

FIG. 2 is a schematic diagram of a conductive end cap and fuse in an embodiment of the present application.

Fig. 3 is a schematic view of a fuse in an embodiment of the present application.

Fig. 4 is a schematic view of a backup protection device in an embodiment of the present application.

Fig. 5 is an internal structural view of the backup protection device in the embodiment of the present application.

Reference numerals:

1. a backup protection device; 11. an overcurrent protector; 111. a housing; 1110. a conductive end cap; 11101. a first conductive end cap; 11102. a second conductive end cap; A. a tin bath; 112. a fuse; 1121. a connection section; 1122. a fuse section; 1123. a transition section; 12. a housing; 13. a connection terminal; 131. a wire inlet terminal; 132. a wire outlet terminal; 14. and an indication module.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.

The terms "comprising" and "having" and any variations thereof in the description and claims of the present application and in the description of the drawings are intended to cover a non-exclusive inclusion.

The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: there are three cases, a, B, a and B simultaneously. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.

Furthermore, the terms first, second and the like in the description and in the claims of the present application or in the above-described figures, are used for distinguishing between different objects and not for describing a particular sequential order, and may be used to expressly or implicitly include one or more such features.

In the description of the present application, unless otherwise indicated, the meaning of "plurality" means two or more (including two), and similarly, "plural sets" means two or more (including two).

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, e.g., the terms "connected" or "coupled" of a mechanical structure may refer to a physical connection, e.g., the physical connection may be a fixed connection, e.g., by a fastener; the physical connection may also be a detachable connection; the physical connection may also be an integral connection. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.

In order to facilitate understanding of the technical solutions of the embodiments of the present application, the following description will explain terms and actions mentioned later.

The distribution system is a system consisting of a distribution substation, a high-voltage distribution line, a distribution transformer, a low-voltage distribution line and corresponding control protection equipment. Distribution is the direct connection to and distribution of electrical energy to consumers in an electrical power system.

A surge protector is one of the control protection devices. The surge protector is also called a lightning protector and is used for protecting electric and electronic equipment from lightning electromagnetic pulse induced voltage, operation transient state and resonance (< 100 microseconds) overvoltage.

The backup protection device 1 is another one of the control protection apparatuses. The backup protection device 1 is arranged at the front end of the surge protector and is used for realizing selective breaking of a circuit of the power distribution system when short-circuit current and lightning current exist in the power distribution system, and the problem that the surge protector is in fusion penetration short-circuit due to abnormal transient overvoltage can be effectively avoided. Wherein lightning current is generated in the circuit of the power distribution system when lightning strikes. The short-circuit current may be generated in a loop formed by the power distribution system and the load after the load end is shorted.

The technical solutions of the embodiments of the present application are explained in detail below with reference to the accompanying drawings.

The embodiment of the application provides an overcurrent protector 11 applied to a backup protection device 1. Fig. 1 is a schematic diagram of an overcurrent protector 11 in some embodiments of the present application. As shown in fig. 1, the overcurrent protector 11 includes: a housing 111 and a fuse 112. Wherein the housing 111 has a receiving cavity. The fuse 112 is disposed in the accommodating chamber and is mounted to the housing 111. The fuse 112 is configured to blow when the backup protection device 1 is connected to a first current and not to blow when connected to a second current. Wherein the first current is less than the second current, and the time for the first current to flow through the fuse 112 is greater than the time for the second current to flow through the fuse 112.

The case 111 is a member for mounting and accommodating the fuse 112. When the fuse 112 carries current, the housing 111 can insulate the fuse 112 from external components, avoiding short circuits in the electrical connection of the external components to the fuse 112. In addition, when the fuse element 112 is fused, the housing 111 can also seal the arc generated by the fuse element 112 in the accommodating cavity, so as to avoid the influence of the arc on other components caused by leakage. The housing 111 may be provided in various shapes, for example, a hollow cylindrical shape, a hollow rectangular parallelepiped shape, etc., which is not particularly limited in this application.

The fusing of the fuse 112 means that the fuse 112 is influenced by the first current in the process of bearing the first current, and the heat reaches a certain value to be disconnected. Specifically, the heat of the fuse 112 may be determined according to Joule's law Q=I ² Rt is calculated, wherein Q is the heat of the fuse 112, I is the current flowing through the fuse 112, R is the resistance of the fuse 112, t is the time for the current to flow through the fuse 112, and it can be seen that when the resistance R of the fuse 112 is constant, the magnitude of the current I carried by the fuse 112 and the time t for the current to flow through the fuse 112 become the influence on the fuse 112, a key factor in whether to blow or not.

Based on the foregoing description, since the surge protector needs to shunt the lightning current in the circuit of the power distribution system, the backup protection device 1 needs to break the circuit of the power distribution system when there is a short-circuit current in the circuit of the power distribution system, and thus the first current may be the short-circuit current and the second current may be the lightning current. Since the short circuit current in the electrical circuit of the power distribution system is typically not less than 0.63 kiloamperes and not more than 1.2 kiloamperes, the lightning current is typically not less than 30 kiloamperes and not more than 300 kiloamperes, it can be seen that the maximum lightning current (300 kiloamperes) is about 476 times the minimum short circuit current (0.63 kiloamperes), i.e. the first current is less than the second current. In addition, since the short-circuit current flows through the fuse 112 for about 10 hours ^-3 In seconds, the lightning current flows through the fuse 112 for about 10 seconds ^-6 Second, it can be seen that the lightning current flows through the fuse 112 for about 1/1000 of the time that the short-circuit current flows through the fuse 112, i.e. the first current flows through the fuse 112 for a longer time than the second current flows through the fuse 112. In summary, and based on the joule law, when the resistance of the fuse 112 is constant, the heat energy generated when the lightning current flows through the fuse 112 is smaller than the heat energy generated when the short-circuit current flows through the fuse 112, so that the fuse 112 can be fused when carrying the first current (short-circuit current) and not fused when carrying the second current (lightning current).

The fuse 112 may be provided in various shapes, such as a cylindrical shape, a rectangular parallelepiped shape, and the like. In addition, the material of the fuse 112 may be various, such as pure copper, red copper, and the like. The specific shape and material of the fuse 112 are not particularly limited, as long as the fuse 112 is able to fuse when carrying a first current and not fuse when carrying a second current.

When the fuse 112 is mounted to the housing 111, there are various mounting methods. In some possible embodiments, mounting channels may be provided at both ends of the housing 111 to mount both ends of the fuse 112 in the mounting channels and expose the fuse 112 to the housing 111. In other possible embodiments, referring to FIG. 2, the housing 111 further includes a conductive end cap 1110, the conductive end cap 1110 being soldered to the fuse 112. In this way, the fuse 112 can be mounted on the housing 111 through the conductive end cap 1110, specifically, the fuse 11 and the conductive end cap 1110 can be connected first, and then the fuse 112 and the conductive end cap 1110 are connected together on the housing 111, so that the mounting accuracy can be improved compared with the case where the main body portion of the housing 111 is directly connected with the fuse 112. In addition, when the conductive end cap 1110 is soldered to the fuse 112, the contact resistance between the conductive end cap 1110 and the fuse can be reduced, and the physical connection between the conductive end cap 1110 and the fuse can be improved in terms of the stability of the electrical connection, as compared with other soldering methods such as spot welding.

Further, when the conductive end cover 1110 is soldered to the fuse 112, a solder may be directly disposed on a portion of the conductive end cover 1110 opposite to the fuse 112, so as to connect the conductive end cover 1110 and the fuse 112 through the solder; with continued reference to fig. 2, a tin bath a may also be provided on the conductive end cap 1110, and a portion of the fuse 112 may be located in the tin bath a to be soldered to the conductive end cap 1110. The tin bath A can position the fuse element 112, so that the fuse element 112 is not easy to slide on the conductive end cover 1110, and the relative connection area and the connection firmness of the conductive end cover 1110 and the fuse element 112 are ensured; in addition, the tin bath a can limit the tin material, so that the tin material can be reduced from flowing to the part outside the opposite part of the conductive end cover 1110 and the fuse 112, and the connection firmness of the conductive end cover 1110 and the fuse 112 is further ensured.

In the technical solution of the embodiment of the present application, by setting the overcurrent protector 11 to include the housing 111 and the fuse element 112, the fuse element 112 can be fused when carrying the first current (short-circuit current), so as to avoid the damage of the first current to the surge protector, and not fused when carrying the second current (lightning current), so that the second current reaches the surge protector and is processed by the surge protector; in addition, the shell 111 can insulate the fuse 112 from the external conductive component when the fuse 112 carries the first current or the second current, so as to avoid short circuit caused by electrical connection between the fuse 112 and the external conductive component, and can seal the arc generated at the fusing part when the fuse 112 fuses, so as to avoid the arc damaging the external component.

FIG. 3 is a schematic illustration of a fuse 112 in accordance with some embodiments of the present application. As shown in fig. 3, the fuse 112 may include a connecting section 1121 and a fusing section 1122 connected, the connecting section 1121 being connected with the housing 111, a cross-sectional area S1 of the connecting section 1121 and a cross-sectional area S2 of the fusing section 1122 satisfying: S1/S2 is more than or equal to 1 and less than or equal to 1.5.

The connection segment 1121 is used to secure the fuse segment 1122 and carry current. There are a variety of ways in which the connecting segment 1121 secures the fused segment 1122. In some embodiments, the connecting segment 1121 may be connected to the fuse segment 1122 and mounted to the housing 111 to secure the fuse segment 1122. In other embodiments, the connecting segment 1121 may be connected to the fuse segment 1122 and electrically connected to the conductive end cap 1110 described above to effect securement of the fuse segment 1122.

The form of the fuse 112 may be variously provided. In some possible arrangements, the connecting segment 1121 may be provided in two segments, the fuse segment 1122 may be provided in one segment, and the fuse segment 1122 may be connected between the two connecting segments 1121. In other possible arrangements, as shown in FIG. 3, the fuse 112 further includes a transition section 1123, the fuse sections 1122 being configured in a plurality, the transition section 1123 being connected between adjacent fuse sections 1122. In this form, there may be a plurality of fuse segments 1122 electrically connected via transition segments 1123 in fuse 112, that is, when fuse 112 is connected to the first current, any one of the plurality of fuse segments 1122 may be fused, which is advantageous for improving the fusing efficiency of fuse 112. In still other possible arrangements, the fuse 112 is configured in plural, each fuse 112 is mounted to the housing 111, and the plural fuses 112 are connected in parallel. In this way, when the fuse 112 carries the second current, the plurality of fuses 112 may shunt the second current to reduce the likelihood that the fuse 112 fuses when carrying the second current.

The cross section of the connecting section 1121 is a surface exposed after the connecting section 1121 is cut in a direction perpendicular to the axis of the connecting section 1121. The cross section of the fuse section 1122 is a surface exposed by cutting the fuse section 1122 in a direction perpendicular to the axis of the fuse section 1122. The cross-section of connecting segment 1121 and the cross-section of fuse segment 1122 may each be circular or rectangular in shape. The cross-sectional area may be the aforementioned circular area or rectangular area.

To facilitate an understanding of the cross-sectional area of the fuse 112 versus the fusing, a detailed description is provided below.

According to the law of resistance r=ρl/S, where R is the resistance of the fuse 112, L is the length of the fuse 112, ρ is the resistivity of the fuse 112, and S is the cross-sectional area of the fuse 112, it can be seen that, in the case where the length L of the fuse 112, the resistivity ρ of the fuse 112 is constant, the cross-sectional area S of the fuse 112 is inversely proportional to the resistance R.

In combination with the aforementioned joule law, in the case where the magnitude of the current carried by the fuse 112 and the time of the current flowing therethrough are both consistent, the thermal energy Q generated by the fuse 112 is proportional to the resistance R of the fuse 112, that is, the thermal energy Q generated by the fuse 112 is inversely proportional to the cross-sectional area S of the fuse 112, that is, when the cross-sectional area S of the fuse 112 is smaller, the thermal energy Q generated by the fuse 112 is greater, and the fuse 112 is more easily fused.

With an understanding of the cross-sectional area of the fuse 112 versus the fusing.

In some possible embodiments, the cross-sectional area S1 of the connecting segment 1121 and the cross-sectional area S2 of the fuse segment 1122 may satisfy S1/s2=1, and the cross-sectional shape of the connecting segment 1121 is the same as the cross-sectional shape of the fuse segment 1122. That is, the cross-sectional shape is the same throughout the fuse 112 and the area is the same.

When the cross-sectional shapes of the fuse 112 are the same throughout and the areas are the same, the volume of the overcurrent protector 11 can be reduced. This is because, if the cross-section of the connection section 1121 is different from the cross-section of the fusing section 1122 in shape and area, in order for the fusing section 1122 to fuse when carrying the first current, it is necessary to design the cross-sectional area S2 of the fusing section 1122 to a predetermined size and design the cross-sectional area S1 of the connection section 1121 to be larger than the cross-sectional area S2 of the fusing section 1122 in order to avoid the connection section 1121 fusing instead of the fusing section 1122. However, when the cross-sectional area S1 of the connecting section 1121 is larger than the cross-sectional area S2 of the fusing section 1122, the volume of the housing 111 needs to be set larger in order for the accommodating chamber to accommodate the connecting section 1121, and when the volume of the housing 111 is set larger, the volume of the overcurrent protector 11 increases.

Therefore, the cross sections of the fuse 112 are the same in shape and the same in area, so that the fuse 112 can be fused when carrying a first current, and not fused when carrying a second current, and the overall volume of the fuse can be reduced, and the volume of the overcurrent protector 11 can be reduced.

In other possible embodiments, the cross-sectional area S1 of the connecting segment 1121 and the cross-sectional area S2 of the fuse segment 1122 satisfy: S1/S2 is more than 1 and less than or equal to 1.5.

If the cross-sectional area S1 of the connecting segment 1121 and the cross-sectional area S2 of the fuse segment 1122 satisfy: S1/S2 < 1, then the resistance of the connection segment 1121 will be large relative to the fused segment 1122, and the connection segment 1121 will be fused in place of the fused segment 1122.

If the cross-sectional area S1 of the connecting segment 1121 and the cross-sectional area S2 of the fuse segment 1122 satisfy: S1/S2 > 1.5, then as the cross-sectional area S1 of the connecting segment 1121 increases, the size of the housing 111 also needs to increase, which in turn results in an increase in the volume of the overcurrent protector 11.

Therefore, the above embodiment has the following advantageous effects: first, since the cross-sectional area S1 of the connection section 1121 is larger than the cross-sectional area S2 of the fusing section 1122, the fusing section 1122 can be easily fused when the first current is carried, and the connection section 1121 mounts the fusing section 1122 on the housing 111 and is not easily fused when either the first current or the second current is carried; second, the connecting section 1121 is connected to the housing 111, so that the area of the connecting portion between the fuse 112 and the housing 111 is larger than the area of the connecting portion between the fuse 1122 and the housing 111, and the connection between the fuse 112 and the housing 111 is more secure; finally, since S1/S2 is less than or equal to 1.5, although the cross-sectional area of the connecting section 1121 is larger than the cross-sectional area of the fusing section 1122, the difference between the two cross-sectional areas is smaller, so that the overcurrent protector 11 according to the embodiment of the application can properly reduce its volume while ensuring the beneficial effects of the two aspects, and is suitable for different installation spaces.

According to other embodiments of the present application, portions of the fuse 112 protrude from the outer surface of the housing 111.

When the fuse 112 is provided in the same shape and the same area in cross section throughout, one or both ends of the fuse 112 may protrude from the outer surface of the housing 111, so that in case the length L of the fuse 112 is fixed, the size of the housing 111 may be reduced to reduce the volume of the overcurrent protector 11.

When the fuse 112 is provided to include the connection section 1121 and the fuse section 1122, the cross-sectional area S1 of the connection section 1121 and the cross-sectional area S2 of the fuse section 1122 satisfy: if 1 < S1/S2 is less than or equal to 1.5, the connecting section 1121 of one or both ends of the fuse 112 may protrude from the outer surface of the housing 111, so that the size of the housing 111 may be reduced, thereby reducing the volume of the overcurrent protector 11.

In the technical solution of the embodiment of the present application, by setting the portion of the fuse 112 to protrude from the outer surface of the housing 111, the volume of the overcurrent protector 11 can be reduced in the axial direction of the fuse 112.

When the volume of the overcurrent protector 11 is small, the overcurrent protector 11 can be better applied to the backup protection device 1. For example, when the overcurrent protector 11 needs to be fused in the process of carrying the first current, the overcurrent protector 11 needs to be set with various specifications according to the magnitude of the first current; when the first current is larger, the cross-sectional area S2 of the fusing section 1122 needs to be set larger, resulting in a larger volume of the overcurrent protector 11, and at this time, the overcurrent protector 11 may not be installed in the original installation position on the backup protection device 1; therefore, when the volume of the overcurrent protector 11 is set to be small, the volume of the overcurrent protector 11 does not increase so much even if the first current increases, so that the overcurrent protector 11 can be better applied to the backup protection device 1.

The embodiment of the application also provides a backup protection device 1 for protecting the surge protector. Fig. 4 is a schematic view of the backup protection device 1 in the embodiment of the present application. Fig. 5 is an internal structural view of the backup protection device 1 in the embodiment of the present application. As shown in fig. 4 and 5, the backup protection device 1 includes a housing 12, a connection terminal 13, and the overcurrent protector 11. The housing 12 has a mounting cavity. The terminal 13 is mounted to the housing 12 and is at least partially located in the mounting cavity. The overcurrent protector 11 is accommodated in the installation chamber and is electrically connected to the connection terminal 13.

The housing 12 is a member for accommodating the overcurrent protector 11. The housing 12 accommodates the overcurrent protector 11 through the installation chamber. At least a portion of the shape of the mounting cavity may be adapted to the shape of the overcurrent protector 11 such that the mounting cavity may limit the overcurrent protector 11 through the cavity wall to reduce the likelihood of vibration or movement of the overcurrent protector 11 within the housing 12.

The connection terminal 13 is a member for supplying a first current, and also a member for supplying and outputting a second current. The connection terminal 13 may include an incoming terminal 131 for receiving the first current or the second current and delivering the same to the overcurrent protector 11, and an outgoing terminal 132 for delivering the second current output from the overcurrent protector 11 to the surge protector. The incoming line terminal 131 and the outgoing line terminal 132 may be provided in various shapes, for example, in a "Z" shape, an "L" shape, etc., and the embodiment of the present application is not limited thereto, as long as the first current and/or the second current can be carried.

When the wiring terminal 13 is installed on the shell 12, the shell 12 can be provided with an incoming connection port and an outgoing connection port; wherein, inlet wire connector installation inlet wire terminal 131, outlet wire connector installation outlet wire terminal 132. After the wire inlet terminal 131, the wire outlet terminal 132 and the shell 12 are installed, the wire inlet terminal 131 can be completely contained in the installation cavity, and a part of the wire outlet terminal 132 can penetrate out of the shell 12 to be connected with the surge protector.

The overcurrent protector 11 is electrically connected to the connection terminal 13. Illustratively, when a portion of the fuse 112 is provided to protrude from the housing 111, the protruding portion may be electrically connected with the connection terminal 13; when the fuse 112 is completely accommodated in the accommodating chamber of the housing 111, the connection terminal 13 may be electrically connected with the conductive end cap 1110 in the housing 111. There are a variety of ways in which the terminal 13 can be electrically connected to the conductive end cap 1110. In one possible connection, the terminal 13 may be spot welded to the conductive end cap 1110, and in another possible connection, the overcurrent protector 11 includes a first conductive end cap 11101 and a second conductive end cap 11102; the first conductive end cover 11101 is soldered with the incoming terminal 131; and/or, the second conductive end cap 11102 is soldered to the outlet terminal 132. Specifically, the method includes the following three connection methods, namely, the first conductive end cover 11101 is soldered to the incoming line terminal 131, and the second conductive end cover 11102 is connected to the outgoing line terminal 132 by spot welding; the first conductive end cover 11101 is in spot welding connection with the incoming line terminal 131, the second conductive end cover 11102 is in soldering connection with the outgoing line terminal 132, the first conductive end cover 11101 is in soldering connection with the incoming line terminal 131, and the second conductive end cover 11102 is in soldering connection with the outgoing line terminal 132. When the first conductive end cover 11101 is soldered to the incoming terminal 131 and the second conductive end cover 11102 is soldered to the outgoing terminal 132, the resistance between the connection terminal 13 and the overcurrent protector 11 is smaller, the reliability of the physical connection therebetween is higher, and the stability of the electrical connection is higher.

In the technical solution of the embodiment of the present application, by setting the backup protection device 1 to include the connection terminal 13, the overcurrent protector 11 and the housing 12, the connection terminal 13 can access the first current and the second current, and output the second current; the overcurrent protector 11 can be fused when the connecting terminal 13 is connected with a first current to disconnect a circuit of the power distribution system, prevent the first current from entering the surge protector, damage the surge protector, not be fused when the connecting terminal 13 is connected with a second current, and distribute the second current to the surge protector so that the surge protector can process the second current. In addition, the housing 12 may mount, house the connection terminal 13 and the overcurrent protector 11, and insulate the connection terminal 13, the overcurrent protector 11 from external conductive members.

It should be noted that if one incoming line terminal 131, one overcurrent protector 11, and one outgoing line terminal 132 constitute one unit, a plurality of units may be provided in the backup protection device 1. The backup protection 1 may also comprise an indication module 14. The indication module 14 may include a circuit board and an indicator light. The wiring board is connected between any two of the overcurrent protectors 11 to obtain electric power. The indicator lamp is connected with the circuit board, is installed and exposed out of the housing 12, and is extinguished based on the power failure of the circuit board when the fuse wire in the overcurrent protector 11 is blown, so as to indicate the on-off of the overcurrent protector 11.

The above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. An overcurrent protector for use in a backup protection device, the overcurrent protector comprising:

a housing having a receiving cavity;

the fusing piece is arranged in the accommodating cavity and is arranged on the shell; the fuse comprises a connecting section and a fusing section which are connected, wherein the cross section area S1 of the connecting section and the cross section area S2 of the fusing section meet the following conditions: S1/S2 is more than or equal to 1 and less than or equal to 1.5; the fuse is configured to blow when the backup protection device is connected to a first current and not to blow when the backup protection device is connected to a second current;

the first current is smaller than the second current, and the time of the first current flowing through the fuse is longer than the time of the second current flowing through the fuse.

2. The overcurrent protector of claim 1, wherein the fuse has the same shape and area in cross section throughout.

3. The overcurrent protector of claim 1, wherein the connecting section is connected to the housing, and wherein a cross-sectional area S1 of the connecting section and a cross-sectional area S2 of the fuse section satisfy: S1/S2 is more than 1 and less than or equal to 1.5.

4. The overcurrent protector of claim 3, wherein the fuse further comprises a transition section, the fuse section configured in plurality, the transition section connected between adjacent two of the fuse sections.

5. The overcurrent protector of any one of claims 2 to 4, wherein the fuse is configured in a plurality, each of the fuses is mounted to the housing, and a plurality of the fuses are connected in parallel.

6. The overcurrent protector of claim 1, wherein a portion of the fuse protrudes from an outer surface of the housing.

7. The overcurrent protector of claim 1, wherein the housing includes a conductive end cap that is soldered to the fuse.

8. The overcurrent protector of claim 7, wherein the conductive end cap is provided with a tin slot, and the portion of the fuse is positioned in the tin slot to be soldered to the conductive end cap.

9. A backup protection device for protecting a surge protector, characterized in that the backup protection device comprises a housing, a connection terminal and an overcurrent protector according to any one of claims 1 to 8;

the housing has a mounting cavity; the wiring terminal is mounted on the shell and at least partially positioned in the mounting cavity; the overcurrent protector is accommodated in the mounting cavity and is electrically connected with the wiring terminal.

10. The backup protection device of claim 9, wherein the connection terminal comprises an incoming terminal and an outgoing terminal; the overcurrent protector comprises a first conductive end cover and a second conductive end cover;

the first conductive end cover is connected with the wire inlet terminal in a soldering way; and/or the number of the groups of groups,

and the second conductive end cover is in tin soldering connection with the outgoing terminal.

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