Fuse with improved insulating property

Abstract

The utility model relates to a fuse capable of increasing insulating property, which comprises a fuse wire and two same shells, and the two shells are arranged in a central symmetry manner by taking the central axis of the fuse wire as a central line and correspond to each other; the fuse comprises a fusing part and two connecting parts connected to the two ends of the fusing part in the X-axis direction, the shell is provided with a containing cavity, a plurality of partition ribs are fixed to the bottom wall of the containing cavity in the X-axis direction at intervals and extend to be fixed to the inner side wall of the containing cavity in the Y-axis direction, and each shell further comprises two clamping faces located on the two sides of the containing cavity in the X-axis direction. The two fixing faces are located on the two sides of the containing cavity in the Y-axis direction; the corresponding fixing surfaces of the two shells are attached and fixed, the corresponding clamping surfaces clamp and fix the connecting part, and the fusing part is located in the accommodating cavity; and on one hand, the flatness of the product during forming is reduced, and on the other hand, sputtered powder metal objects after the fusing part is fused can be scattered in different cavities formed by the separation of the separation ribs, so that the insulation performance of the fuse is effectively improved.

Description

Technical Field

[0001] This utility model relates to the technical field of current protection devices, and in particular to a fuse with improved insulation performance. Background Technology

[0002] Fuses are widely used in high and low voltage power distribution systems, electrical control systems, and electrical equipment. They can melt the fusible element by generating heat after the current exceeds the specified value for a period of time, thereby breaking the circuit and achieving the effect of current protection.

[0003] In recent years, with the rapid development of new energy vehicles, the requirements for the protection devices of the entire electronic control system and power supply have become increasingly higher, and the requirements for the insulation performance of fuses have become increasingly higher.

[0004] However, most existing fuses cannot balance production costs and insulation performance. Utility Model Content

[0005] Therefore, it is necessary to provide a fuse with relatively low cost and strong insulation performance to address the problem that current fuses cannot balance manufacturing costs and insulation performance.

[0006] This application first provides a fuse with enhanced insulation performance, including a fuse wire and two identical housings, wherein the two housings are symmetrically arranged about the central axis of the fuse wire and correspond to each other.

[0007] The fuse includes a fusible part and two connecting parts connected to both ends of the fusible part along the X-axis direction. The housing has a receiving cavity. The bottom wall of the receiving cavity has multiple partition ribs fixed at intervals along the X-axis direction. The partition ribs extend along the Y-axis direction to be fixed to the inner side wall of the receiving cavity. Each housing also includes two clamping surfaces located on both sides of the receiving cavity along the X-axis direction and two fixing surfaces located on both sides of the receiving cavity along the Y-axis direction.

[0008] The two housings are fixed together by their corresponding fixing surfaces, and the corresponding clamping surfaces clamp the connecting part. The fused part is located inside the receiving cavity.

[0009] In one embodiment, the cross-section of the receiving cavity along the XOZ plane is an inverted trapezoid, and the projection of the partition rib along the Z-axis is a reciprocating broken line.

[0010] In one embodiment, each of the fixed surfaces is fixed with a plug-in portion and has a plug-in groove. The plug-in portion is plugged into the plug-in groove on the corresponding fixed surface of another housing. The top surface of the plug-in portion is fixed to the bottom wall of the corresponding plug-in groove by ultrasonic melting.

[0011] In one embodiment, the surface roughness of the top surface of the insertion portion is different from that of the corresponding bottom wall of the insertion slot.

[0012] In one embodiment, a first energy-conducting rib is fixed to one of the top surface of the insertion portion and the bottom wall of the corresponding insertion slot, and the cross-sectional area of ​​the first energy-conducting rib gradually decreases along the Z-axis away from the fixed surface.

[0013] In one embodiment, the clamping surface is fixed with a limiting pin and has a limiting hole. The limiting pin corresponds to the limiting hole on the clamping surface of another housing. The connecting part has a through hole corresponding to the limiting pin and the limiting hole. The limiting pin passes through the corresponding through hole to the corresponding limiting hole.

[0014] In one embodiment, the top surface of the limiting pin and the bottom wall of the limiting hole are fixed by ultrasonic melting, and the two have different surface roughnesses. The top surface of the limiting pin is fixed with a second energy-conducting rib, and the cross-sectional area of ​​the second energy-conducting rib gradually decreases along the Z-axis away from the clamping surface.

[0015] In one embodiment, a limiting portion is fixed on the fixed surface, the connecting portion abuts against the limiting portion along the Y-axis direction, the insertion portion is fixed to the top surface of the limiting portion, the limiting portion protrudes towards the receiving cavity along the Y-axis direction, and the connecting portion also abuts against the protruding portion of the limiting portion along the X-axis direction.

[0016] In one embodiment, the clamping surface is machined with a spark pattern.

[0017] In one embodiment, the fusible portion includes a fusible segment and two connecting segments, both of which are arranged along the X-axis and connected to the corresponding connecting portion, and the fusible segment connects the two connecting segments;

[0018] The fused segment is perpendicular or inclined to the connecting segment along the XOY plane.

[0019] The aforementioned fuse with enhanced insulation performance uses two identical housings symmetrically arranged around the fuse's central axis, reducing the cost of housing mold opening and effectively lowering production difficulty and cost. Furthermore, by setting multiple baffle ribs within the housing cavity, the flatness of the product during molding is reduced, and when the fuse melts due to current overload, the sputtered powder metal will scatter into different cavities formed by the baffle ribs, thereby effectively improving the insulation performance of the fuse. Attached Figure Description

[0020] Figure 1 A perspective view of an insulation-performing fuse added to this application;

[0021] Figure 2 for Figure 1 A 3D view of one of the shells hidden within;

[0022] Figure 3 for Figure 2 A 3D view of the fuse hidden in the image;

[0023] Figure 4 Perspective views of fuses in two different embodiments of the fuse with added insulation performance for this application.

[0024] Reference numerals: 10, housing; 11, receiving cavity; 12, clamping surface; 12a, limiting pin; 12b, limiting hole; 12c, second energy guiding rib; 13, fixing surface; 13a, insertion part; 13b, insertion groove; 13c, first energy guiding rib; 13d, limiting part; 20, fuse; 21, fusible part; 21a, fusible section; 21b, connecting section; 22, connecting part; 22a, through hole. Detailed Implementation

[0025] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0030] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0031] Please combine Figure 1 , Figure 2 as well as Figure 3 As shown, this application first provides a fuse with enhanced insulation performance, including a fuse wire 20 and two identical housings 10. The two housings 10 are symmetrically arranged around the central axis of the fuse wire 20 and correspond to each other. The fuse wire 20 includes a fusing part 21 and two connecting parts 22 connected to both ends of the fusing part 21 along the X-axis. The housing 10 has a receiving cavity 11. The bottom wall of the receiving cavity 11 is fixed with multiple partition ribs 11a at intervals along the X-axis. The partition ribs 11a extend along the Y-axis and are fixed to the inner side wall of the receiving cavity 11. Each housing 10 also includes two clamping surfaces 12 located on both sides of the receiving cavity 11 along the X-axis and two fixing surfaces 13 located on both sides of the receiving cavity 11 along the Y-axis. The corresponding fixing surfaces 13 of the two housings 10 are fitted and fixed, and the corresponding clamping surfaces 12 clamp and fix the connecting parts 22. The fusing part 21 is located inside the receiving cavity 11.

[0032] In this application, by using two identical housings 10 symmetrically arranged with the central axis of the fuse 20 as the center line, the mold opening cost of the housing 10 is reduced, effectively reducing the production difficulty and cost. In addition, by setting multiple partition ribs 11a in the receiving cavity 11, on the one hand, the flatness of the product during molding is reduced, and on the other hand, when the current overload causes the fuse part 21 to melt, the sputtered powder metal will be scattered in the different cavities formed by the partition ribs 11a, thereby effectively improving the insulation performance of the fuse of this application.

[0033] Please refer to Figure 3 As shown, in some embodiments, the cross-section of the receiving cavity 11 along the XOZ plane is an inverted trapezoid, and the projection of the partition rib 11a along the Z-axis is a reciprocating broken line.

[0034] Preferably, four partition ribs 11a are provided inside the receiving cavity 11, wherein one partition rib 11a is provided on each of the two inclined surfaces of the receiving cavity 11, and two partition ribs 11a are provided on the bottom wall of the receiving cavity 11.

[0035] Of course, in other embodiments, the shape and number of the partition ribs 11a can also be adjusted according to actual needs, as long as the accommodating cavity 11 can be divided into different chambers to store the powder metal material sputtered after the melting part 21 melts. This application does not make any further limitations here.

[0036] Please refer to Figure 3 As shown, in some embodiments, each fixed surface 13 is fixed with a plug-in portion 13a and has a plug-in groove 13b. The plug-in portion 13a is plugged into the plug-in groove 13b on the corresponding fixed surface 13 of the other housing 10. The top surface of the plug-in portion 13a and the bottom wall of the corresponding plug-in groove 13b are fixed by ultrasonic melting.

[0037] The insertion and engagement between the insertion part 13a and the corresponding insertion slot 13b serves two purposes: firstly, it provides a positioning effect, facilitating the initial assembly of the two housings 10 and reducing manufacturing difficulty; secondly, the close fit and fixation after insertion increases the contact area between the fixing surfaces 13, restricting the relative movement between them, thereby increasing the connection and fixing strength between the two housings 10, and improving the overall connection strength of the fuse in this application, as well as its torque resistance and performance during installation.

[0038] Furthermore, the top surface of the insertion part 13a is ultrasonically melted and fixed to the bottom wall of the corresponding insertion groove 13b. The ultrasonically melted joint is located inside the insertion groove 13b and will not be exposed to the outside. The fixing surfaces 13 of the two housings 10 can fit flatly and ensure that the appearance joint of the two housings 10 is flat, thereby improving the appearance aesthetics of the fuse of this application.

[0039] Preferably, the insertion portion 13a and insertion slot 13b on each fixed surface 13 are arranged at intervals along the X-axis direction.

[0040] Of course, in some other embodiments, each fixed surface 13 may also be provided with different numbers and shapes of insertion parts 13a and insertion slots 13b, as long as the insertion parts 13a and the insertion slots 13b on the other housing 10 can be inserted into each other. This application will not give examples of each one.

[0041] In some embodiments, the surface roughness of the top surface of the insertion part 13a and the bottom wall of the corresponding insertion groove 13b are different; the different surface roughness can effectively improve the fixing effect of ultrasonic melting between the housings 10, thereby improving the connection strength of the fuse of this application.

[0042] Please refer to Figure 3 As shown, in some embodiments, a first energy-conducting rib 13c is fixed to one of the top surface of the insertion part 13a and the bottom wall of the corresponding insertion groove 13b. The cross-sectional area of ​​the first energy-conducting rib 13c gradually decreases along the Z-axis away from the fixed surface 13. The first energy-conducting rib 13c can be ultrasonically melted with the rough surface of the other to further improve the welding strength of ultrasonic melting.

[0043] Preferably, the top surface of the insertion part 13a and the bottom wall of the corresponding insertion groove 13b with lower surface roughness are fixed with the first energy-conducting rib 13c.

[0044] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, the clamping surface 12 is fixed with a limiting pin 12a and has a limiting hole 12b. The limiting pin 12a corresponds to the limiting hole 12b on the clamping surface 12 of the other housing 10. The connecting part 22 has a through hole 22a corresponding to the limiting pin 12a and the limiting hole 12b. The limiting pin 12a passes through the corresponding through hole 22a to the corresponding limiting hole 12b.

[0045] After the limiting pin 12a passes through the through hole 22a, it is inserted into the limiting hole 12b. On the one hand, it has the effect of limiting the fuse 20 to improve the connection strength of the fuse of this application. On the other hand, when the connecting part 22 is tightened by bolts, the limiting pin 12a passing through the through hole 22a can reduce the deformation of the connecting part 22 to improve the torsional strength of the fuse 20.

[0046] Please refer to Figure 3 As shown, in some embodiments, the top surface of the limiting pin 12a and the bottom wall of the limiting hole 12b are fixed by ultrasonic melting. The surface roughness of the two is different, and the top surface of the limiting pin 12a is fixed with a second energy guiding rib 12c. The cross-sectional area of ​​the second energy guiding rib 12c gradually decreases along the Z-axis away from the clamping surface 12.

[0047] By fixing the top surface of the limiting pin 12a to the bottom wall of the limiting hole 12b through ultrasonic melting, the ultrasonic melting area between the two housings 10 can be increased, thereby increasing the welding strength between them; the difference in surface roughness between the two and the setting of the second energy-conducting rib 12c can further increase the welding strength of ultrasonic melting, so as to improve the connection strength of the fuse in this application.

[0048] Please combine Figure 2 as well as Figure 3 As shown, in some embodiments, a limiting portion 13d is fixed on the fixing surface 13, the connecting portion 22 abuts against the limiting portion 13d along the Y-axis direction, the insertion portion 13a is fixed to the top surface of the limiting portion 13d, the limiting portion 13d protrudes towards the receiving cavity 11 along the Y-axis direction, and the connecting portion 22 also abuts against the protruding portion of the limiting portion 13d along the X-axis direction.

[0049] The limiting part 13d can limit the displacement of the fuse 20 along the X-axis and Y-axis directions to improve the fixing reliability of the housing 10 to the fuse 20, thereby improving the connection strength of the fuse of this application.

[0050] In some embodiments, the clamping surface 12 is processed with spark patterns. The spark patterns can increase the roughness of the clamping surface 12 and improve the clamping reliability of the housing 10 to the fuse 20. On the other hand, they can facilitate the demolding of the housing 10, thereby improving production efficiency.

[0051] Please refer to Figure 4 As shown, in some embodiments, the fuse section 21 includes a fuse segment 21a and two connecting segments 21b. Both connecting segments 21b are arranged along the X-axis and connected to the corresponding connecting section 22. The fuse segment 21a connects the two connecting segments 21b. The fuse segment 21a is perpendicular or inclined to the connecting segments 21b along the XOY plane. Different fuse section 21 structures can provide different fuse rated currents. This application can select different fuse section 21 structures according to actual needs, and has high versatility.

[0052] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0053] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. An increased insulation performance fuse, characterized by, It includes a fuse (20) and two identical housings (10), the two housings (10) being symmetrically arranged about the central axis of the fuse (20) and corresponding to each other; The fuse (20) includes a fuse section (21) and two connecting sections (22) connected to both ends of the fuse section (21) along the X-axis direction. The housing (10) has a receiving cavity (11). The bottom wall of the receiving cavity (11) is fixed with multiple partition ribs (11a) at intervals along the X-axis direction. The partition ribs (11a) extend along the Y-axis direction to be fixed to the inner side wall of the receiving cavity (11). Each housing (10) also includes two clamping surfaces (12) located on both sides of the receiving cavity (11) along the X-axis direction, and two fixing surfaces (13) located on both sides of the receiving cavity (11) along the Y-axis direction. The two housings (10) are fixed together by their corresponding fixing surfaces (13), and the corresponding clamping surfaces (12) clamp the connecting part (22). The fused part (21) is located in the receiving cavity (11).

2. The increased insulation performance fuse of claim 1, wherein, The cross-section of the receiving cavity (11) along the XOZ plane is an inverted trapezoid, and the projection of the partition rib (11a) along the Z-axis is a reciprocating broken line.

3. The increased insulation performance fuse of claim 1, wherein, Each of the fixed surfaces (13) is fixed with a plug-in part (13a) and has a plug-in groove (13b). The plug-in part (13a) is plugged into the plug-in groove (13b) on the fixed surface (13) of the other housing (10). The top surface of the plug-in part (13a) and the bottom wall of the corresponding plug-in groove (13b) are fixed by ultrasonic melting.

4. The increased insulation performance fuse of claim 3, wherein, The surface roughness of the top surface of the insertion part (13a) is different from that of the bottom wall of the corresponding insertion groove (13b).

5. The increased insulation performance fuse of claim 4, wherein, The top surface of the insertion part (13a) and the bottom wall of the corresponding insertion groove (13b) are fixed with a first energy guiding rib (13c), and the cross-sectional area of ​​the first energy guiding rib (13c) gradually decreases along the Z-axis away from the fixed surface (13).

6. The increased insulation performance fuse of claim 3, wherein, The clamping surface (12) is fixed with a limiting pin (12a) and has a limiting hole (12b). The limiting pin (12a) corresponds to the limiting hole (12b) on the clamping surface (12) of the other housing (10). The connecting part (22) has a through hole (22a) corresponding to the limiting pin (12a) and the limiting hole (12b). The limiting pin (12a) passes through the through hole (22a) to the limiting hole (12b).

7. The increased insulation performance fuse of claim 6, wherein, The top surface of the limiting pin (12a) and the bottom wall of the limiting hole (12b) are fixed by ultrasonic melting. The surface roughness of the two is different. The top surface of the limiting pin (12a) is fixed with a second energy guiding rib (12c). The cross-sectional area of ​​the second energy guiding rib (12c) gradually decreases along the Z-axis away from the clamping surface (12).

8. The increased insulation performance fuse of claim 3, wherein, A limiting part (13d) is fixed on the fixed surface (13). The connecting part (22) abuts against the limiting part (13d) along the Y-axis direction. The insertion part (13a) is fixed to the top surface of the limiting part (13d). The limiting part (13d) protrudes towards the receiving cavity (11) along the Y-axis direction. The connecting part (22) also abuts against the protruding part of the limiting part (13d) along the X-axis direction.

9. The increased insulation performance fuse of claim 1, wherein, The clamping surface (12) is machined with spark patterns.

10. The increased insulation performance fuse of claim 1, wherein, The fusible section (21) includes a fusible segment (21a) and two connecting segments (21b). The two connecting segments (21b) are arranged along the X-axis and connected to the corresponding connecting section (22). The fusible segment (21a) connects the two connecting segments (21b). The fused segment (21a) is perpendicular or inclined along the XOY plane relative to the connecting segment (21b).

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