Anti-surge current safety device

Abstract

The utility model discloses an anti-surge current safety device which comprises a box body, the box body is provided with an accommodating groove, a box cover is arranged at the opening of the accommodating groove, and the box cover and the box body are enclosed to form an accommodating space; a fuse link and an NTC thermistor are arranged in the accommodating space; the fuse link is spiral, one end of the fuse link is connected with one end of the NTC thermistor, and the other end of the fuse link penetrates through the box cover outwards to form a first connecting end of the current safety device; the other end of the NTC thermistor penetrates through the box cover outwards to form a second connecting end of the current safety device; the fuse link and the NTC thermistor are integrated in the box body, so that the space in the box body can be fully utilized, the occupied space of the fuse link and the NTC thermistor is saved, the circuit design of a product is simplified, and the fuse can be suitable for application scenes with compact space; and meanwhile, by arranging the spiral fuse link, the surge current can be further inhibited, so that the product circuit is effectively protected.

Description

Technical Field

[0001] The utility model relates to the technical field of electronic components, in particular to a current fuse device with surge resistance. Background Art

[0002] In the current field of electronic technology, current fuses are widely used as important circuit protection devices. The main function of traditional current fuses is current interruption. When an overcurrent occurs in the circuit, the fuse melts to cut off the current and protect the circuit and equipment. However, it has obvious limitations, that is, it does not have the function of suppressing surge current. To solve this problem, the common practice is to add an NTC (Negative Temperature Coefficient Thermistor) in the circuit.

[0003] Although the NTC can suppress surge current to a certain extent, in some application scenarios with compact space, this method will appear very crowded. This not only brings great difficulties to the circuit layout but also may affect the overall performance and reliability of the equipment. With the continuous development of electronic products with limited space today, this traditional solution is difficult to meet the actual needs. Summary of the Invention

[0004] The purpose of the utility model is to overcome the above-mentioned shortcomings, and provide a current fuse device with surge resistance, which saves the space occupied by the fuse and the NTC thermistor, is conducive to simplifying the circuit design of the product, and thus can be applied to application scenarios with compact space; at the same time, by setting a spiral fuse, the surge current can be further suppressed, thereby effectively protecting the product circuit.

[0005] To achieve the above purpose, the specific scheme of the utility model is as follows:

[0006] A current fuse device with surge resistance, including a box body, the box body has a receiving groove, a box cover is arranged at the opening of the receiving groove, and the box cover and the box body enclose to form a receiving space;

[0007] A fuse and an NTC thermistor are arranged in the receiving space; the fuse is spiral, one end of the fuse is connected to one end of the NTC thermistor, and the other end of the fuse penetrates through the box cover outward to form the first connection end of the current fuse device; the other end of the NTC thermistor penetrates through the box cover outward to form the second connection end of the current fuse device.

[0008] The utility model is further arranged such that a partition board extends from the inner side wall of the box cover towards the receiving space, and the partition board is arranged between the fuse and the NTC thermistor.

[0009] The utility model is further arranged such that the fuse and the NTC thermistor are distributed on both sides of the receiving space.

[0010] The present utility model is further configured such that the fuse element and the NTC thermistor are located at two opposite ends of the diagonal of the accommodation space.

[0011] The present utility model is further configured such that the fuse element spirally extends around the axis of the straight line segment at one end of the NTC thermistor.

[0012] The present utility model is further configured such that the accommodation space is filled with quartz sand.

[0013] The present utility model is further configured such that an iron rod is provided on the inner side wall of the box cover, and the iron rod penetrates into the fuse element along the axis of the fuse element.

[0014] The present utility model is further configured such that the box cover is detachably connected to the box body.

[0015] The present utility model is further configured such that convex ribs are provided on both side walls of the box cover, limiting grooves are provided on the corresponding two side walls of the accommodation groove, and the length of the convex ribs is equal to the length of the limiting grooves.

[0016] The beneficial effects of the present utility model are as follows: By integrating the fuse element and the NTC thermistor in the box body, the present utility model can make full use of the space inside the box body, save the space occupied by the fuse element and the NTC thermistor, facilitate the simplification of the circuit design of the product, and thus be applicable to application scenarios with compact space; at the same time, by providing a spiral fuse element, the inrush current can be further suppressed, thereby effectively protecting the product circuit. Description of the Drawings

[0017] Figure 1 is an exploded schematic view of the current fuse device provided in the first embodiment of the present utility model;

[0018] Figure 2 is a schematic structural view of the current fuse device provided in the first embodiment of the present utility model;

[0019] Figure 3 is an exploded schematic view of the current fuse device provided in the fourth embodiment of the present utility model;

[0020] Figure 4 is a schematic structural view of the current fuse device provided in the fifth embodiment of the present utility model on the basis of the fourth embodiment;

[0021] Figure 5 is a schematic structural view of the current fuse device provided in the second embodiment of the present utility model;

[0022] Figure 6 is a schematic structural view of the current fuse device provided in the fifth embodiment of the present utility model on the basis of the second embodiment;

[0023] Description of the reference numerals: 1. Box body; 11. Accommodating groove; 12. Limiting groove; 2. Box cover; 21. Partition board; 22. Convex rib; 3. Fuse body; 4. NTC thermistor; 5. Iron rod. Detailed implementation manners

[0024] The present utility model will be further described in detail below in conjunction with the accompanying drawings and specific embodiments, but the implementation scope of the present utility model is not limited thereto.

[0025] Embodiment 1: As Figures 1 to 6 shown, a surge-resistant current fuse device described in this embodiment includes a box body, the box body is in a cuboid shape, the box body has an accommodating groove, a box cover is arranged at the opening of the accommodating groove, and the box cover and the box body enclose to form an accommodating space;

[0026] A fuse body and an NTC thermistor are arranged in the accommodating space; the fuse body is in a spiral shape, one end of the fuse body is connected to one end of the NTC thermistor, and the other end of the fuse body penetrates through the box cover outward to form a first connection end of the current fuse device; the other end of the NTC thermistor penetrates through the box cover outward to form a second connection end of the current fuse device.

[0027] Specifically, when the surge-resistant current fuse device in this embodiment is in use, the first connection end and the second connection end of the current fuse device are connected in series in the product circuit. Thus, when the product circuit is powered on and working, the fuse body plays an overload protection role, that is, the function of current interruption, when overloaded, to protect the product circuit from damage, and the characteristics of the NTC thermistor are used to suppress the surge current generated at the initial stage of the product circuit being powered on, preventing current impact, thereby effectively protecting the product circuit.

[0028] In this embodiment, by integrating the fuse body and the NTC thermistor in the box body, the space inside the box body can be fully utilized, the space occupied by the fuse body and the NTC thermistor is saved, which is beneficial to simplifying the circuit design of the product, and thus can be applied to application scenarios with a compact space; at the same time, by setting the spiral fuse body, the surge current can be further suppressed, thereby effectively protecting the product circuit.

[0029] In some implementation manners of the surge-resistant current fuse device described in this embodiment, a partition board extends from the inner side wall of the box cover towards the inside of the accommodating space, and the partition board is arranged between the fuse body and the NTC thermistor. By setting the partition board in this embodiment, the fuse body and the NTC thermistor are spaced apart, effectively ensuring the use reliability of the fuse body and the NTC thermistor, avoiding the risk of short circuit due to short circuit between the two, and making the structure safer to use.

[0030] A surge-resistant current fuse device described in this embodiment. In some embodiments, the fuse body spirally extends along the axis of the straight segment at one end of the NTC thermistor. With this arrangement, the volume of the current fuse device is further reduced, thereby reducing the space occupied by the current fuse device to adapt to application scenarios with limited installation space.

[0031] Embodiment 2: As Figure 5 and Figure 6 shown, the difference between this embodiment and Embodiment 1 is that the fuse body and the NTC thermistor are distributed on both sides of the accommodation space; the remaining structures are the same as those in Embodiment 1 and will not be elaborated here. With this arrangement, the mutual influence between the fuse body and the NTC thermistor is further reduced, and the reliability of the structure in use is further improved. Through the above settings, it is suitable for application scenarios with relatively compact installation space.

[0032] Preferably, the fuse body and the NTC thermistor are located at the two diagonal ends of the accommodation space. This makes the interval between the fuse body and the NTC thermistor larger, and the reliability is further improved. Specifically, one end of the NTC thermistor extends towards the width of the receiving groove and is electrically connected in series with one end of the fuse body.

[0033] Embodiment 3: On the basis of Embodiment 1 or Embodiment 2, further, the accommodation space is filled with quartz sand (not shown in the figure). With this arrangement, the positions of the fuse body and the NTC thermistor can be fixed by the quartz sand, and at the same time, it can further play a flame-retardant role, and the structural use safety is higher.

[0034] Embodiment 4: As Figure 3 , Figure 4 and Figure 6 shown, on the basis of Embodiment 1, Embodiment 2 or Embodiment 3, further, an iron rod is provided on the inner side wall of the box cover, and the iron rod penetrates into the fuse body along the axis of the fuse body. In this embodiment, by providing the iron rod in cooperation with the spiral fuse body, the effect of suppressing surge current is further enhanced.

[0035] Embodiment 5: As Figure 4 and Figure 6 shown, on the basis of Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4, further, the box cover is detachably connected to the box body. With this arrangement, it is convenient for the disassembly and assembly of the current fuse device for the subsequent maintenance of the product circuit.

[0036] A surge-resistant current fuse device described in this embodiment. Specifically, as Figure 4 and Figure 6As shown in the figure, convex ribs are provided on both side walls of the box cover, and limiting grooves are provided on both corresponding side walls of the accommodating groove. The length of the convex rib is equal to the length of the limiting groove. In this embodiment, by providing the convex rib and the limiting groove, when the box cover is installed on the box body, the convex rib on the box cover is inserted into the limiting groove and slides along the track of the limiting groove until the convex rib abuts against the end of the limiting groove, thereby limiting the box cover and effectively preventing the depth of the box cover inserted into the accommodating groove from being excessive and affecting the reliable use of the fuse and the NTC thermistor.

[0037] The above is only a preferred embodiment of the present invention. Therefore, equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention are included in the protection scope of the patent application of the present invention.

Claims

1. A surge-resistant current fuse device, characterized in that, It includes a box body which has a receiving groove. A box cover is provided at the opening of the receiving groove. The box cover and the box body enclose to form a receiving space. A fuse body and an NTC thermistor are arranged in the receiving space. The fuse body is in a spiral shape. One end of the fuse body is connected to one end of the NTC thermistor. The other end of the fuse body penetrates through the box cover outward and constitutes the first connection end of the current fuse device. The other end of the NTC thermistor penetrates through the box cover outward and constitutes the second connection end of the current fuse device.

2. The current fuse device against surge according to claim 1, wherein A partition board extends from the inner side wall of the box cover towards the inside of the receiving space. The partition board is arranged between the fuse body and the NTC thermistor.

3. The current fuse device against surge according to claim 1, characterized in that, The fuse body and the NTC thermistor are distributed on both sides of the receiving space.

4. The current fuse device against surge according to claim 3, characterized in that, The fuse body and the NTC thermistor are located at the two diagonal ends of the receiving space.

5. The current fuse device against surge according to claim 1, characterized in that, The fuse body spirally extends around the axis of the straight line segment at one end of the NTC thermistor.

6. The current fuse device against surge according to claim 1, characterized in that, The receiving space is filled with quartz sand.

7. An anti-surge current protection device according to claim 1, characterized in that, An iron rod is provided on the inner side wall of the box cover. The iron rod penetrates into the fuse body along the axis of the fuse body.

8. An anti-surge current fuse device according to claim 1, characterized in that The box cover is detachably connected to the box body.

9. The current fuse device against surge according to claim 8, characterized in that, Convex ribs are provided on both side walls of the box cover. Limit grooves are provided on the corresponding two side walls of the receiving groove. The length of the convex ribs is equal to the length of the limit grooves.

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