Fuse

Abstract

The utility model discloses a fuse which comprises a conductive housing, and the side wall of the conductive housing is provided with a through hole. The first electromagnet is fixedly connected with the conductive shell through a conductive rod; the second electromagnet is connected to the conductive shell in a sliding mode through an insulating rod, in the initial state, the first electromagnet and the second electromagnet are connected in an inserted mode, and in the power-on state, the polarities of the opposite sides of the first electromagnet and the second electromagnet are the same; and the conductive firing pin is fixedly connected to one side, far away from the first electromagnet, of the second electromagnet, and the conductive firing pin can extend out along the through hole of the conductive shell. The safety socket can be used for many times and is good in safety.

Description

Technical Field

[0001] The utility model relates to the technical field of fuses, in particular to a large-current and high-voltage current-limiting fuse. Background Art

[0002] Fuses are widely used in high and low voltage power distribution systems and control systems as well as electrical equipment. As short circuit and overcurrent protectors, they are one of the most commonly used protective devices. Their working principle is: when the current exceeds the specified value for a period of time, the fuse melts the fuse with the heat generated by itself, thereby disconnecting the circuit. Existing fuses usually include a barrel, a conductive rod, a metal wire, an elastic component and a striker. The current enters the metal wire through the conductive rod. When the current is too large, the metal wire melts, causing the elastic component to drive the striker to move, thereby achieving the effect of power off.

[0003] At present, fuses are usually used once. Once they blow, they need to be replaced with new ones, which not only increases costs but also affects the stability and reliability of the power system. At the same time, existing fuses may generate arcs or sparks when cutting off the current, which may not only cause safety accidents such as fires, but also cause harm to surrounding equipment and personnel. Utility Model Content

[0004] To this end, the utility model proposes a high-current and high-voltage current-limiting fuse that can be used multiple times and has good safety.

[0005] In view of the above technical problems, the utility model provides the following technical solutions:

[0006] A fuse comprises a conductive shell, wherein the side wall of the conductive shell has a through hole; a first electromagnet is fixedly connected to the conductive shell via a conductive rod; a second electromagnet is slidably connected to the conductive shell via an insulating rod, wherein in an initial state, the first electromagnet is plug-connected with the second electromagnet, and in a power-on state, the polarities of the opposite sides of the first electromagnet and the second electromagnet are the same; a conductive striker is fixedly connected to a side of the second electromagnet away from the first electromagnet, and the conductive striker can extend along the through hole of the conductive shell.

[0007] In some embodiments of the utility model, the conductive shell includes a first side wall and a second side wall parallel to each other and a cylindrical side wall located therebetween, the conductive rod is connected to the first side wall, the second side wall is provided with the through hole, and the insulating rod is slidably connected to the cylindrical side wall.

[0008] In some embodiments of the utility model, a guide slot extending along the center line direction of the cylindrical side wall of the conductive shell is provided, one end of the insulating rod is connected to the second electromagnet, and the other end is slidably connected to the guide slot.

[0009] In some implementations of the utility model, an elastic member is provided between the insulating rod and the end of the guide slot, and the elastic force of the elastic member acts on the insulating rod, so that the second electromagnet is subjected to a force in a direction close to the first electromagnet.

[0010] In some embodiments of the utility model, the guide slide groove is provided with a support shaft extending along the center line direction of the conductive shell, the insulating rod is sleeved on the support shaft, and the elastic member is a compression spring sleeved on the support shaft.

[0011] In some embodiments of the utility model, the first electromagnet includes a first iron core, the second electromagnet includes a second iron core, a conductive plug-in portion is provided on a side of the first iron core opposite to the second iron core, and the conductive plug-in portion includes an insertion rod arranged on one of the first iron core and the second iron core and a socket arranged on the other of the first iron core and the second iron core.

[0012] In some embodiments of the utility model, the first electromagnet includes a first coil sleeved on a first iron core, a first end of the first coil is connected to the conductive rod, and the other end of the first coil is connected to the conductive plug-in portion.

[0013] In some embodiments of the utility model, the second electromagnet includes a second coil sleeved on a second iron core, a first end of the second coil is connected to the conductive striker, and the other end is connected to the conductive plug-in portion.

[0014] In some implementation modes of the present invention, the number of coils of the first coil and the second coil is the same.

[0015] In some implementation modes of the present invention, a conductive sheet is provided at the end of the conductive striker.

[0016] The technical solution of the utility model has the following technical effects compared with the prior art:

[0017] In the fuse provided by the utility model, under normal working conditions, the current enters the first electromagnet through the conductive housing and the conductive rod. Since the first electromagnet and the second electromagnet are plugged and connected to each other, the first electromagnet and the second electromagnet are energized and generate magnetism respectively. Since the two sides repel each other, but the current flowing into them is constant, the distance between the two remains unchanged, and the current is electrically connected to the external conductive device through the second electromagnet through the striker. When the current suddenly increases, the repulsive force between the first electromagnet and the second electromagnet will also increase, and the second electromagnet drives the striker to move instantly, so that the first electromagnet and the second electromagnet are disconnected and connected, achieving the effect of power failure. When it is necessary to restore, it is only necessary to restore the plug-in connection between the first electromagnet and the second electromagnet. The fuse does not achieve power failure by material melting, which can reduce material costs. At the same time, it can be quickly restored and used multiple times, achieving the effect of saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein:

[0019] Figure 1 It is a cross-sectional view of a specific implementation of the fuse of the utility model;

[0020] Figure 2 It is a cross-sectional view of the fuse of the utility model when the current is disconnected;

[0021] Figure 3 This is a front view of the fuse of the utility model when the current is disconnected;

[0022] Figure 4 The utility model is a schematic diagram of the structure of the conductive shell of the fuse. DETAILED DESCRIPTION

[0023] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0025] In the description of the present invention, 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, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0026] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0027] like Figure 1-Figure 3 The figure shows a specific embodiment of the fuse provided by the utility model, and the fuse 1 comprises: a conductive shell 2, the side wall of which has a perforation; a first electromagnet 4, a second electromagnet 5 and a conductive striker 6 located in the conductive shell 2. The first electromagnet 4 is fixedly connected to the conductive shell 2 through a conductive rod 3, and the second electromagnet 5 is slidably connected to the conductive shell 2 through an insulating rod 12. In the initial state, the first electromagnet 4 and the second electromagnet 5 are plug-connected, and in the power-on state, the first electromagnet 4 and the second electromagnet 5 have the same polarity on the opposite side, and have a repulsive force on each other; the conductive striker 6 is fixedly connected to the side of the second electromagnet 5 away from the first electromagnet 4, and the conductive striker 6 can extend along the perforation of the conductive shell 2.

[0028] The working principle of the fuse 1 is as follows: under normal working conditions, the current enters the first electromagnet 4 through the conductive housing 2 and the conductive rod 3. Since the first electromagnet 4 and the second electromagnet 5 are plugged and connected to each other, the current enters the second electromagnet 5 through the first electromagnet 4. The first electromagnet 4 and the second electromagnet 5 are energized to generate magnetism. The first electromagnet 4 and the second electromagnet 5 repel each other on opposite sides, but the current flowing in is constant, so the repulsive force generated is also constant, and the distance between them remains unchanged. Then the current passes through the second electromagnet 5 and is electrically connected to the external conductive device through the striker. When the current suddenly increases, the excessive current causes the magnetism on the first electromagnet 4 and the second electromagnet 5 to increase, thereby causing the repulsive force between them to increase. At the same time, because the first electromagnet 4 is fixed to the conductive housing 2, the second electromagnet 5 moves in a direction away from the first electromagnet 4, and the second electromagnet 5 drives the striker to move instantly, so that the first electromagnet 4 and the second electromagnet 5 are disconnected from the plug connection, achieving the effect of power failure. When it is necessary to restore, it is only necessary to restore the plugging of the first electromagnet 4 and the second electromagnet 5. The fuse 1 does not achieve power outage by fusing materials, which can reduce material costs. At the same time, it can be quickly restored and used multiple times, achieving the effect of saving time and labor.

[0029] Specifically, in an optional embodiment, the conductive shell 2 is cylindrical as a whole, and includes a first side wall and a second side wall parallel to each other and a cylindrical side wall located therebetween. The conductive rod 3 is connected to the first side wall and extends along the center line direction of the conductive shell 2. The second side wall is provided with the through hole, and the striker can pass through the through hole without contacting the second side wall.

[0030] Specifically, the insulating rod 12 is slidably connected to the cylindrical side wall. In an optional embodiment, Figure 4 As shown, a guide slot 10 extending along the center line direction of the conductive shell 2 is provided on the cylindrical side wall of the conductive shell 2, and the insulating rod 12 extends in a direction perpendicular to the center line direction of the conductive shell 2, one end of which is connected to the second electromagnet 5, and the other end is slidably connected to the guide slot 10; the above-mentioned sliding guide structure can avoid shaking of the second electromagnet 5 when sliding, thereby avoiding contact with the conductive shell 2 due to unstable movement of the second electromagnet 5 under abnormal working conditions with large current.

[0031] Specifically, an elastic member 13 is provided between the insulating rod 12 and the end of the guide slot 10, and the elastic force of the elastic member 13 acts on the insulating rod 12, so that the second electromagnet 5 is subjected to a force in a direction close to the first electromagnet 4. The elastic member 13 provides a supporting force to the insulating rod 12, thereby ensuring that the second electromagnet 5 is spaced apart from and connected to the first electromagnet 4 in the initial state.

[0032] Specifically, in an optional embodiment, the guide slide groove 10 is provided with a support shaft 11 extending along the center line direction of the conductive housing 2, the insulating rod 12 is sleeved on the support shaft 11, and the elastic member 13 is a compression spring sleeved on the support shaft 11. The support effect of the insulating rod 12 is further enhanced by providing the above-mentioned support shaft 11, so that it can slide stably when the second electromagnet 5 is subjected to a large repulsive force. At the same time, the compression spring sleeved on the support shaft 11 can also make the movement stability of the insulating rod 12 better when it is reset.

[0033] Specifically, the first electromagnet 4 and the second electromagnet 5 are not connected in a unique manner. In an optional embodiment, the first electromagnet 4 includes a first iron core, the second electromagnet 5 includes a second iron core, and a conductive plug-in portion is provided on the side opposite to the first iron core and the second iron core. The conductive plug-in portion includes a plug rod 8 provided on one of the first iron core and the second iron core and a socket 7 provided on the other of the first iron core and the second iron core. For example, Figure 3 As shown, the conductive plug-in portion includes a socket 7 provided on the first core and an insertion rod 8 provided on the second core. In the initial state and the normal power-on state, the insertion rod 8 is inserted into the socket 7 to achieve electrical connection between the two.

[0034] Specifically, in an optional embodiment, the first electromagnet 4 includes a first coil sleeved on the first iron core, the first end of the first coil is connected to the conductive rod 3, and the other end is connected to the conductive plug-in portion, that is, the socket 7 on the first iron core. The second electromagnet 5 includes a second coil sleeved on the second iron core, the first end of the second coil is connected to the conductive striker 6, and the other end is connected to the conductive plug-in portion, that is, the plug 8 on the second iron core.

[0035] The number of coils of the first coil is the same as that of the second coil, so that the magnetic properties of the first electromagnet 4 and the second electromagnet 5 are the same, thereby facilitating the repulsion operation.

[0036] It should be noted that:

[0037] The calculation formula of magnetic field strength is: H=N×I / Le.

[0038] Where: H is the magnetic field strength, in A / m; N is the number of turns of the excitation coil; I is the excitation current (measured value), in A; Le is the effective magnetic path length of the test sample, in m. Under other conditions, the magnetic field strength is proportional to the current, so the larger the current, the stronger the magnetism of the electromagnet. Therefore, when the external current increases, the magnetism of the first electromagnet 4 and the second electromagnet 5 becomes stronger.

[0039] A conductive sheet 9 is disposed at the end of the conductive striker 6 , and the conductive sheet 9 can be provided so that current can pass through the conductive sheet 9 and connect to an external conductive device.

[0040] When the fuse 1 is used for operation, the second electromagnet 5 is firstly connected with the first electromagnet 4, that is, the plug 8 on the second electromagnet 5 is inserted into the socket 7 on the first electromagnet 4. In the initial state, the second electromagnet 5 is located at the first position where it abuts against or maintains a certain gap with the first electromagnet 4 under the action of the elastic member 13; when the conductive housing 2 is powered, the current enters the first coil of the first electromagnet 4 through the conductive rod 3, and enters the second coil of the second electromagnet 5 through the socket 7 and the plug 8, and then passes through the striker to the external conductive device. Since the current flowing into the first electromagnet 4 and the second electromagnet 5 is constant, the repulsive force generated between the two is also constant, and the distance between the two remains unchanged and the conductive connection is maintained.

[0041] When the current suddenly increases, the magnetism of the first electromagnet 4 and the second electromagnet 5 increases, thereby causing the repulsive force between the two to increase. At the same time, the second electromagnet 5 moves away from the first electromagnet 4 under the action of the repulsive force, thereby driving the striker to move instantly outward along the perforation of the conductive shell 2, and the insertion rod 8 on the second electromagnet 5 is pulled out of the socket 7 of the first electromagnet 4, thereby achieving the effect of powering off.

[0042] When restoration is needed, it is only necessary to insert the plug rod 8 into the socket 7. The fuse 1 can not only be used multiple times, but also can be restored quickly without generating sparks and arcs, and has high safety.

[0043] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the present utility model.

Claims

1. A fuse, characterized in that: include: A conductive shell, wherein a side wall of the conductive shell has a perforation; A first electromagnet is fixedly connected to the conductive housing via a conductive rod; A second electromagnet is slidably connected to the conductive housing through an insulating rod. In an initial state, the first electromagnet is plug-connected with the second electromagnet, and in a power-on state, the first electromagnet and the second electromagnet have the same polarity on opposite sides. A conductive striker is fixedly connected to a side of the second electromagnet away from the first electromagnet, and the conductive striker can extend along the through hole of the conductive shell.

2. A fuse according to claim 1, characterized in that: The conductive shell comprises a first side wall and a second side wall which are parallel to each other and a cylindrical side wall located therebetween. The conductive rod is connected to the first side wall. The second side wall is provided with the through hole. The insulating rod is slidably connected to the cylindrical side wall.

3. A fuse according to claim 2, characterized in that: A guide slot extending along the center line of the conductive housing is disposed on the cylindrical side wall of the conductive housing. One end of the insulating rod is connected to the second electromagnet, and the other end is slidably connected to the guide slot.

4. A fuse according to claim 3, characterized in that: An elastic member is provided between the insulating rod and the end of the guide slot, and the elastic force of the elastic member acts on the insulating rod, so that the second electromagnet is subjected to a force in a direction close to the first electromagnet.

5. A fuse according to claim 4, characterized in that: The guide slide groove is provided with a support shaft extending along the center line direction of the conductive shell, the insulating rod is sleeved on the support shaft, and the elastic member is a compression spring sleeved on the support shaft.

6. A fuse according to claim 1, characterized in that: The first electromagnet includes a first iron core, the second electromagnet includes a second iron core, a conductive plug-in portion is provided on a side of the first iron core opposite to the second iron core, and the conductive plug-in portion includes an insertion rod arranged on one of the first iron core and the second iron core and a socket arranged on the other of the first iron core and the second iron core.

7. A fuse according to claim 6, characterized in that: The first electromagnet comprises a first coil sleeved on a first iron core, a first end of the first coil is connected to the conductive rod, and the other end of the first coil is connected to the conductive plug-in portion.

8. A fuse according to claim 7, characterized in that: The second electromagnet comprises a second coil sleeved on a second iron core, a first end of the second coil is connected to the conductive striker, and the other end of the second coil is connected to the conductive plug-in portion.

9. A fuse according to claim 8, characterized in that: The first coil and the second coil have the same number of coils.

10. A fuse according to claim 1, characterized in that: A conductive sheet is provided at the end of the conductive striker.

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