CN206451676U - Chip fuse - Google Patents

Abstract

The utility model discloses a chip fuse, comprising an intermediate PCB board with a through slot and a fuse electrically connected to the intermediate PCB board, shielding plates are respectively arranged on the upper and lower sides of the intermediate PCB board, and the intermediate PCB board and the two shielding plates form a receiving cavity for receiving the fuse, and the chip fuse also comprises a support plate, the two support plates are respectively arranged on the upper and lower sides of the intermediate PCB board and clamped between the shielding plate and the intermediate PCB board, and the two support plates are provided with avoidance slots corresponding to the through slot. According to the chip fuse provided by the utility model, by adding support plates on both sides of the intermediate PCB board, the fuse is placed in a larger space, which effectively improves the breaking performance of the chip fuse.

Description

Chip fuse

technical field

The utility model relates to a fuse, in particular to a patch fuse.

Background technique

SMD fuses currently on the market usually include melt, square ceramic tubes, and copper end caps; most of the fuses are single or double. The maximum size is mostly 4X12mm. The maximum current is only about 60A, which cannot meet the growing market demand.

The record of Chinese patent application number 201110123326.X provides a suspended fuse type surface mount fuse with PCB substrate structure. The metal fuse is placed between the two PCB substrates to form a suspended fuse structure. Part of the fuse is exposed outside the end of the insulator and bent to make it close to the end electrode. A reinforcement is provided on the inner side of the PCB shell cover. electrode, and extend to the edge of both ends of the insulator to be electrically connected to the end face electrode, so that the end of the reinforced electrode is in contact with the end face electrode, and at the same time, the two ends of the fuse are respectively in surface contact with the corresponding reinforced electrode, ensuring the fuse The reliability of the connection between the wire and the end electrode.

The fuse with the above-mentioned PCB substrate structure can meet the demand for large current, but the structure of the above-mentioned patented product has the problem that the fusing space is too small, which leads to local overheating in the fusing space, which in turn affects the breaking performance and other electrical properties of the fuse.

Therefore, it is necessary to provide a fuse with a PCB substrate structure with better breaking performance.

Contents of the invention

The purpose of the utility model is to provide a PCB substrate structure fuse with better breaking performance to meet the market demand for high-current fuses.

In order to achieve the above purpose, the utility model discloses a chip fuse, which includes a middle PCB board with a through groove and a melt electrically connected to the middle PCB board, and the upper and lower sides of the middle PCB board are respectively provided with The shielding plate that shields the melt, the chip fuse also includes a support plate, and the two support plates are respectively arranged on the upper and lower sides of the middle PCB board and sandwiched between the shielding plate and the middle PCB Between the plates, the two support plates are provided with avoidance grooves corresponding to the through grooves.

Compared with the prior art, the chip fuse provided by the utility model realizes the electrical connection of the melt through the middle PCB board, and sets a support board to block and shield the board on both sides of the middle PCB board, so that the middle PCB There is a certain distance between the two sides of the plate and the shielding plate, so as to increase the fusing space of the fuse and effectively improve the breaking performance of the chip fuse provided by the utility model.

Preferably, the melt spans the through groove and both ends of the melt are electrically connected to one side of the middle PCB board; the melt spans the through groove so that most of the melt is in the through groove and The installation space formed by the escape groove is in a suspended shape, so that the fusing part of the melt has a larger fusing space, and the breaking performance of the patch fuse is improved.

Preferably, the two ends of the melt are respectively electrically connected to the upper side of the middle PCB, and the connections between the two ends of the melt and the middle PCB are respectively located at the two ends of the through groove outside.

Preferably, the size of the avoidance groove is larger than the size of the through groove, so that the connection between the melt and the intermediate PCB board is located in the communication cavity between the avoidance groove and the through groove.

Specifically, the middle PCB board includes a connecting portion provided with the through-groove and fixing portions arranged at both ends of the connecting portion, and the upper side of the fixing portion is higher than the upper side of the connecting portion; several The melts are respectively electrically connected to the upper sides of the connecting parts.

Preferably, the middle PCB board is respectively provided with positioning holes on the outer sides of both ends of the through groove, and the two ends of the melt are respectively welded in the positioning holes.

Preferably, the shading plate, the middle PCB board, and the supporting plate are respectively provided with several connecting holes; several connecting columns respectively pass through the connecting holes to connect the shading plate, the The middle PCB board and the support board; the setting purpose of the connection hole is to make the welding connection part of the melt and the middle PCB board relatively flat, and the middle PCB board will not protrude more, so that the structure of the utility model chip fuse link Relatively compact.

Specifically, an electrical connection terminal is provided on the side of the shielding plate away from the support plate; the connection column has conductivity, and the connection column is electrically connected to the middle PCB board and the electrical connection terminal; The side of the shielding plate facing away from the support plate is provided with an electrical connection end, so that the patch fuse of the present invention can be conveniently installed and connected to an external circuit as an electrical component.

Description of drawings

Fig. 1 is a schematic diagram of the three-dimensional structure of the chip fuse of the present invention.

Fig. 2 is a sectional view along A-A direction in Fig. 1 .

Fig. 3 is an enlarged view of part B in Fig. 2 .

Fig. 4 is a schematic diagram of the structure of the lower shielding plate.

Fig. 5 is a structural schematic diagram of the support plate.

FIG. 6 is a schematic structural diagram of the middle PCB board.

Fig. 7 is a schematic diagram of the structure of the upper shielding plate.

detailed description

In order to describe the technical content, structural features, achieved goals and effects of the present utility model in detail, the following will be described in detail in conjunction with the embodiments and accompanying drawings.

As shown in Figures 1-3, the chip fuse provided by the utility model includes a middle PCB board 200 provided with a through groove 230 and a melt 500 electrically connected to the middle PCB board 200, and the upper and lower sides of the middle PCB board 200 Shielding plates for shielding the melt 500 are respectively provided, and the chip fuse also includes a support plate 300, and the two support plates 300 are respectively arranged on the upper and lower sides of the middle PCB board 200 and sandwiched between the shield board and the middle PCB board 200, The two support plates 300 define escape grooves 320 corresponding to the through grooves 230 . Combined with Figure 4-Figure 7, more specifically:

The patch fuse shown in FIGS. 1-3 includes a lower shielding plate 100 , a supporting plate 300 , a middle PCB board 200 , a supporting plate 300 , and an upper shielding plate 400 from bottom to top. Among them, the middle part of the middle PCB board 200 is provided with a through groove 230, and the two support plates 300 located on the upper and lower sides of the middle PCB board 200 are respectively provided with avoidance grooves 320, the through groove 230, the avoidance groove 320 and the shielding through groove 230 and The upper shielding plate 400 and the lower shielding plate 100 of the escape groove 320 jointly enclose a substantially closed installation space, so that most of the melt 500 electrically connected to the middle PCB board 200 is located in the installation space, so that The fusing part of the fuse 500 located in the installation space has a larger fusing space, which improves the breaking performance of the chip fuse provided by the utility model.

The structures of the lower shielding board 100 , the middle PCB board 200 , the support board 300 , and the upper shielding board 400 will be described in detail below.

The lower shielding plate 100 shown in Figure 4 is a flat cube structure, and the upper side of the lower shielding plate 100 is rectangular; the two ends of the lower shielding plate 100 are respectively provided with connecting holes 110, and there are four connecting holes 110, The four connection holes 110 are respectively located at the four corners of the lower shielding plate 100 and pass through the upper and lower sides of the lower shielding plate 100 . It can be understood that the lower shielding plate 100 should have shielding and shielding effects on the melt 500 and can be made of insulating and high temperature resistant materials.

The support plate 300 shown in FIG. 5 has a flat cubic structure corresponding to the lower shielding plate 100 , and the upper and lower sides of the support plate 300 have a rectangular structure. The support plate 300 is provided with connecting holes 310 corresponding to the lower shielding plate 100 and runs through its upper and lower sides, and the middle part of the support plate 300 is provided with an escape groove 320. As shown in FIG. 5 , the escape groove 320 also runs through the upper and lower sides of the support plate 300 , and the avoidance groove 320 is a rectangle similar to the shape of the support plate 300 . The support plate 300 can also be made of insulating and high temperature resistant material.

The middle PCB board 200 as shown in FIG. 6 also has a flat cubic structure corresponding to the lower shielding board 100 and the supporting board 300 , and the upper and lower sides of the middle PCB board 200 have a rectangular structure. The four corners of the middle PCB 200 are correspondingly provided with four connection holes 250 , and the middle part of the middle PCB 200 is also provided with a through groove 230 , and the size of the through groove 230 is larger than that of the escape groove 320 . As shown in FIG. 6 , the through groove 230 also runs through the upper and lower side surfaces of the support plate 300 , and the escape groove 320 is a rectangle similar to the shape of the outer edge of the support plate 300 . Specifically, the intermediate PCB board 200 includes a connecting portion 210 and a fixing portion 220 disposed at both ends of the connecting portion 210, wherein the connecting portion 210 is provided with a through groove 230, and the connecting hole 250 is opened in the fixing portion 220; As shown, the upper side of the fixing part 220 is higher than the upper side of the connecting part 210, so that in the chip fuse of the present invention, there is a certain gap between the middle part of the upper side of the middle PCB board 200 and the support plate 300.

The upper shielding plate 400 shown in Figure 7 is the same as the lower shielding plate 100 in a flat cubic structure, and the lower side of the upper shielding plate 400 is rectangular; the two ends of the upper shielding plate 400 are respectively provided with connection holes 410 There are four connecting holes 410 in total, and the four connecting holes 410 are respectively located at the four corners of the upper shielding plate 400 and penetrate through the upper and lower sides of the upper shielding plate 400 . It can be understood that the upper shielding plate 400 should have shielding and shielding effects on the melt 500 and can be made of insulating and high temperature resistant materials.

As shown in FIGS. 1-3 , connecting columns 600 corresponding to the number and size of the connecting holes respectively pass through the connecting holes to connect the lower shielding board 100 , the middle PCB board 200 , the support board 300 , and the upper shielding board 400 . Specifically in this embodiment, the number of connecting posts 600 is four, and the four connecting posts 600 pass through the connecting holes respectively, so that the lower shielding board 100, the middle PCB board 200, the support board 300, and the upper shielding board 400 are reliable and Connect firmly.

As shown in FIG. 6, the melt 500 spans the through groove 230, and the two ends of the melt 500 are respectively electrically connected to the middle PCB board 200, so that most of the melt 500 is suspended in the through groove 230 and the avoidance groove 320. In the installation space of the chip fuse, the fusing part of the fuse 500 has a larger fusing space, and the breaking performance of the chip fuse is improved. 2, 3, and 6, more specifically, several parallel melts 500 are arranged along the long side direction of the through groove 230, and several parallel melts 500 are electrically connected to the middle PCB board The upper side of the melt 200 and the two ends of the melt 500 are respectively electrically connected to the outer sides of the two ends of the through groove 230 . Wherein, although the avoidance groove 320 is provided corresponding to the through groove 230, the size of the avoidance groove 320 is larger than the size of the through groove 230, and the length of the avoidance groove 320 is slightly longer than the length of the through groove 230, so that the two ends of the melt 500 and the middle PCB board The junction of 200 is located in the communication cavity between the escape groove 320 and the through groove 230 .

Please refer to Fig. 2, Fig. 3, and Fig. 6, only two ends of the melt 500 are fixedly connected to the outer sides of the through groove 230 of the middle PCB board 200, and most of the melt 500 is suspended in the through groove 230 , the avoidance groove 320 , and the closed space surrounded by the upper shielding plate 400 and the lower shielding plate 100 . The lower shielding plate 100, the support plate 300, the middle PCB board 200, the support plate 300, and the upper shielding plate 400 arranged in sequence constitute a large and stable and reliable fusing space, so that the utility model chip fuse has better breaking performance.

Preferably, in order to make the connection between the melt 500 and the middle PCB 200 simple and reliable, the two ends of the melt 500 can be welded to the middle PCB 200 respectively, specifically, the middle PCB 200 is connected to the two ends of the through groove 230 Positioning holes 240 are respectively opened on the outside, and electrical connection parts 210 are arranged in the positioning holes 240; the two ends of several melts 500 are respectively welded in the positioning holes 240; the purpose of setting the positioning holes 240 is to make the melt 500 and the middle PCB The soldering part of the board 200 is relatively flat and does not protrude more than the middle PCB board 200, so that the structure of the patch fuse of the present invention is relatively compact.

Furthermore, as shown in FIG. 4 , the lower side of the lower shielding plate 100 facing away from the support plate 300 is provided with an electrical connection terminal 120 ; the aforementioned connecting post 600 is also a conductive structure. The electrical connection terminal 120 of the intermediate PCB board 200 and the lower shielding plate 100 is electrically connected through the connection column 600, so that the melt 500 in the installation space and the electrical connection terminal 120 are electrically conducted, so that the chip fuse provided by the utility model, As an electrical component, it can be easily installed and connected to an external circuit.

Compared with the prior art, the chip fuse provided by the utility model realizes the electrical connection of the melt 500 through the middle PCB board 200, and sets a support plate 300 to block and block the two sides of the middle PCB board 200 respectively. So that there is a certain distance between the two sides of the middle PCB board 200 and the shielding plate, so as to achieve the purpose of increasing the fusing space of the fuse, and effectively improve the breaking performance of the chip fuse provided by the utility model. According to the chip fuse provided by the utility model, by adding support plates 300 on both sides of the middle PCB board 200, the melt 500 is located in a larger space, effectively improving the breaking performance of the chip fuse.

What is disclosed above is only the preferred embodiment of the present utility model, and of course the scope of rights of the present utility model cannot be limited with this. Therefore, the equivalent changes made according to the patent scope of the utility model still belong to the scope covered by the utility model .

Claims (8)

1. A chip fuse, comprising a middle PCB board provided with a through groove and a melt electrically connected to the middle PCB board, the upper and lower sides of the middle PCB board are respectively provided with shielding plates for shielding the melt , characterized in that, the chip fuse also includes a support plate, and the two support plates are respectively arranged on the upper and lower sides of the middle PCB board and sandwiched between the shielding board and the middle PCB board, The two support plates are provided with avoidance grooves corresponding to the through grooves. 2 . The chip fuse according to claim 1 , wherein the melt spans the through groove and both ends of the melt are electrically connected to one side of the intermediate PCB. 3 . 3. The chip fuse according to claim 2, characterized in that, the two ends of the melt are respectively electrically connected to the upper side of the middle PCB board, and the two ends of the melt are connected to the middle The connection points of the PCB board are respectively located outside the two ends of the through groove. 4. The chip fuse according to claim 2, characterized in that, the size of the escape groove is larger than the size of the through groove, so that the connection between the melt and the intermediate PCB board is located in the Avoid the groove and the communicating cavity of the through groove. 5. The chip fuse according to claim 2, characterized in that, the intermediate PCB board includes a connecting portion provided with the through-groove and fixing portions arranged at both ends of the connecting portion, and the fixing portion The upper side of the upper side is higher than the upper side of the connecting part; several of the melts are respectively electrically connected to the upper side of the connecting part. 6. The patch fuse according to claim 1, characterized in that, the middle PCB board is respectively provided with positioning holes on the outer sides of the two ends of the through groove, and the two ends of the melt are respectively welded to the in the positioning hole. 7. The chip fuse according to claim 1, wherein the shielding plate, the intermediate PCB board, and the support plate are respectively provided with several connecting holes; several connecting columns respectively pass through The connecting hole is used to connect the shielding board, the middle PCB board, and the supporting board. 8. The chip fuse according to claim 7, characterized in that, the side of the shielding plate away from the support plate is provided with an electrical connection terminal; the connection column has conductivity, and the connection column is electrically conductive Connect the middle PCB board and the electrical connection terminal.