CN108321039B - Fuse element and manufacturing method thereof - Google Patents
Fuse element and manufacturing method thereof Download PDFInfo
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- CN108321039B CN108321039B CN201810076920.XA CN201810076920A CN108321039B CN 108321039 B CN108321039 B CN 108321039B CN 201810076920 A CN201810076920 A CN 201810076920A CN 108321039 B CN108321039 B CN 108321039B
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- melt
- fuse element
- sheet
- hole
- filamentous
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
- H01H69/02—Manufacture of fuses
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H85/00—Protective devices in which the current flows through a part of fusible material and this current is interrupted by displacement of the fusible material when this current becomes excessive
- H01H85/02—Details
- H01H85/04—Fuses, i.e. expendable parts of the protective device, e.g. cartridges
- H01H85/05—Component parts thereof
- H01H85/055—Fusible members
- H01H85/08—Fusible members characterised by the shape or form of the fusible member
Abstract
The invention discloses a fuse element and a manufacturing method thereof, wherein the fuse element comprises a filamentous melt, a sheet melt formed on the filamentous melt and a through hole formed on the sheet melt, and the sheet melt forms a narrow connecting part at the through hole to form a fusing part of the fuse element. The invention integrates the filamentous melt and the flaky melt on the same fuse element by respectively forming the flaky melt and the through holes on the filamentous melt, so that the fuse element has the advantages of uniform dimension of the filamentous melt, low cost and convenient assembly, and simultaneously can control the position of a fusing point/an arc extinguishing point of the fuse element and adjust the impedance by controlling the thickness of the flaky melt and the position/the dimension of the through holes on the flaky melt.
Description
Technical Field
The invention relates to the technical field of fuses, in particular to a fuse element and a manufacturing method thereof.
Background
Fuses are widely used in electronic and electrical products to protect the products from excessive current. The principle that the fuse can protect a product is that when current flows through a conductive fuse with proper impedance, the fuse is blown due to overheating when the current exceeds rated current, and then the current is isolated from entering the product. The higher the impedance after the burn-off, the better the isolation effect. Generally, the larger the cross-sectional area of the fuse, the lower the resistance and the higher the rated current. The fuse is connected with the protected circuit in series, and when the fuse is used in a rated current range, the voltage drop and the temperature rise are smaller and better. The fuse wire is heated by excessive current, an arc is generated before the fuse wire is completely blown, the arc is instantaneous and local high energy, the destructive power is strong, and the important factors which must be considered in the design and the manufacture of the fuse wire are included.
As shown in fig. 1, a conventional fuse device 10 is shown, wherein the fuse device 10 includes a fuse element 11, a protective carrier 12 sleeved outside the fuse element 11, and metal caps 13 sealed at two ends of the protective carrier 12, and the metal caps 13 are electrically conductively connected to the fuse element 11 by soldering with solder 16. The fuse element 11 is generally formed by a conductive wire, a conductive sheet, or an insulating wire or an insulating rod coated with a conductive wire, that is, the fuse element is generally in a filament form or a sheet form.
The fuse element in the form of a filament is much smaller in external dimensions than the fuse element in the form of a pellet, and is less expensive to manufacture and more uniform in external dimensions.
The assembly of the filamentary fuse element is much easier in the manufacturing process, and there are many automatic assembly devices available on the market that can satisfy the assembly of the filamentary fuse element in the fuse device. However, there is no automated apparatus capable of automatically assembling the chip fuse element. The main reasons for this are: as for the fuse element, because the fuse element has the characteristic of circular cross section, the fuse element can be fixed and assembled by adopting a universal and simple assembling machine and a clamp without excessively considering the installation angle of the fuse element; however, since the fuse element in a sheet shape has a flat shape, it is necessary to control the fuse element in a correct direction during assembly, and additional jigs, positioning devices, and the like are required, which increases the cost and complicates the process.
Although, in view of the above comparison, the fuse element is obviously more suitable for industrial production than the fuse element in the form of a pellet, since the fuse element is uniform and thin in size, the melting point/arc-extinguishing point is rather difficult to control. In contrast, the point of structural weakness can be made in the pellet fuse element to control the fuse element's melting and arc-extinguishing points. In addition, in a fuse device assembled from filamentary fuse elements, it is difficult to change the magnitude of its resistance unless a different fuse element is replaced; in a fuse device assembled from a sheet-like fuse element, the impedance can be adjusted by changing the weak structure thereof.
Therefore, it is an important subject in the fuse technology field to provide a fuse with the advantages of the uniformity of the fuse element, low cost and convenient processing, and the advantages of the controllable melting point and impedance of the chip fuse element.
Disclosure of Invention
In view of the above-mentioned shortcomings in the prior art, the present invention provides a fuse element and a method for manufacturing the same, which combines the advantages of the fuse element and the pellet fuse element, so as to provide the advantages of low cost and convenient processing of the fuse element, and controllable fusing effect of the pellet fuse element.
In order to achieve the above object, the present invention provides a method for manufacturing a fuse element, including:
providing a filamentous melt;
partially stamping the filamentous melt, and forming a sheet-shaped melt at the stamping position; and
and punching a formed through hole on the sheet-shaped melt, wherein a narrow connecting part is formed at the formed through hole of the sheet-shaped melt so as to form a fusing part of the fuse element.
By adopting the technical scheme, the sheet melt and the through holes are respectively formed on the filamentous melt by adopting a stamping and punching mode, and the filamentous melt and the sheet melt are integrated on the same fuse element, so that the fuse element has the advantages of uniform size of the filamentous melt, low cost and convenience in assembly, and meanwhile, the position of a fusing point/an arc extinguishing point of the fuse element can be controlled and the impedance can be adjusted by controlling the thickness of the sheet melt and the position/size of the through holes on the sheet melt.
In an embodiment of the method for manufacturing a fuse element of the present invention, the step of partially punching the filamentary melt includes: and respectively stamping two opposite sides of the filiform melt.
In the embodiment of the manufacturing method of the fuse element, the punching depths of the two sides are the same.
In an embodiment of the method for manufacturing a fuse element of the present invention, the step of partially punching the filamentary melt includes: and stamping the middle section of the filamentous melt.
In an embodiment of the method for manufacturing a fuse element of the present invention, the step of partially punching the filamentary melt includes: and stamping a plurality of positions in the filamentous fused mass.
In the embodiment of the manufacturing method of the fuse element, the multiple positions at least comprise the middle section and two ends of the filamentous melt. In an embodiment of the method for manufacturing a fuse element of the present invention, the step of punching a through hole on the sheet melt includes: punching a plurality of through holes on a sheet-shaped melt formed by punching the middle section of the filamentous melt, and forming a narrow connecting part with the smallest cross section area at the through hole to form a fusing part of the fuse element.
In the embodiment of the manufacturing method of the fuse element, the plurality of through holes are arranged along the width direction of the fuse element to form at least one row of open pore structures, and the cross-sectional areas of the narrow connecting parts between the through holes in the same row are equal.
The invention also provides a fuse element, which comprises the fuse element prepared by the manufacturing method.
In an embodiment of the fuse element of the present invention, the fuse element includes a fuse melt, a sheet melt formed on the fuse melt, and a through hole formed on the sheet melt.
In the embodiment of the fuse element, the two opposite sides of the filamentous melt are respectively provided with the concave parts at the positions where the sheet-shaped melt is formed.
In the embodiment of the fuse element, the depths of the concave parts at two sides are the same.
In an embodiment of the fuse element of the present invention, the recessed portion is an arc shape with a middle portion narrower than both ends.
In an embodiment of the fuse element of the present invention, the through hole is an elliptical hole having a long axis extending along a length direction of the fuse element.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional structural view of a conventional fuse device.
Fig. 2 is a schematic top view of the fuse element according to embodiment 1 of the present invention.
Fig. 3 is a schematic side view of the fuse element of fig. 2.
Fig. 4 is a schematic top view of the fuse element of fig. 2 prior to stamping of the filamentary melt.
Fig. 5 is a schematic top view of the fuse element of fig. 2 after punching of the filamentary melt.
Fig. 6 is a schematic top view of the fuse element according to embodiment 2 of the present invention. A fuse element having the same side structure as that of embodiment 1 is shown.
Fig. 7 is a schematic top view of the fuse element according to embodiment 3 of the present invention. A fuse element having the same side structure as that of embodiment 1 is shown.
Fig. 8 is a schematic top view of the structure of the manufacturing process of the fuse element according to embodiment 4 of the present invention.
Fig. 9 is a schematic side view of the completed fuse element according to embodiment 4 of the present invention.
Fig. 10 is a schematic top view of the structure of the manufacturing process of the fuse element according to embodiment 5 of the present invention.
Fig. 11 is a schematic side view of the completed fuse element according to embodiment 5 of the present invention.
Fig. 12 is a schematic top view of the fuse element according to embodiment 6 of the present invention. A fuse element having the same side structure as that of example 5 is shown.
Fig. 13 is a schematic top view of the fuse element according to embodiment 7 of the present invention. A fuse element having the same side structure as that of example 5 is shown.
Fig. 14 is a schematic top view of the structure of the manufacturing process of the fuse element according to embodiment 8 of the present invention.
Fig. 15 is a schematic side view of the completed fuse element according to embodiment 8 of the present invention.
The correspondence of reference numerals to components is as follows:
a fuse device 10; a fuse element 11; a protective carrier 12; a metal cap 13; a chip fuse element 14; a connecting portion 15; a solder 16; a fuse element 20; a filamentary melt 21; a sheet melt 22; recessed portions 23, through holes 24; a fusing portion 25; a first sheet melt 22A; a first recessed portion 23A; a first through hole 24A; the first fusing portion 25A; a second sheet melt 22B; a second recessed portion 23B; a second through hole 24B; and a second fuse portion 25B.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Example 1:
referring to fig. 2 to 5, embodiment 1 of the present invention provides a fuse element 20 having the advantages of both a fuse element in a filament shape and a fuse element in a sheet shape, and a method for manufacturing the fuse element 20.
As shown in fig. 2, the fuse element 20 includes a filament-like melt 21, a sheet-like melt 22 formed on the filament-like melt 21, and a through-hole 24 formed on the sheet-like melt 22. The wire-shaped melt 21 is formed from a metal wire of uniform thickness, both ends of which can be connected to the protective carrier of the fuse device in an electrically conductive manner by means of a solder via metal caps. The sheet-shaped melt 22 is formed in the middle of the filamentous melt 21 by punching. As shown in fig. 2 and fig. 3, when the sheet-shaped melt 22 is formed by stamping, two opposite sides of the middle section of the filament-shaped melt 21 are simultaneously stamped, a concave portion 23 is formed at each stamping, the concave portions 23 at two sides are symmetrical in position and have the same shape, size and speed, so as to form a rectangular sheet body with a long axis extending along the length direction of the fuse element 20, the concave portions 23 at two sides are in a shape that the middle portion is narrower than the two ends, so that the middle portion of the formed sheet-shaped melt 22 is narrower than the two ends, and the joints between the two ends and the filament-shaped melt 21 are in a natural transition arc shape.
For the sheet-like melt 22, we can adjust its dividing ability by changing the thickness of its sheet, the thinner the sheet is, the easier it is to divide, i.e. the fuse element of the present invention with the sheet-like melt has controllable dividing effect.
Through the scheme, the fuse element of the embodiment 1 of the invention is formed by integrally forming the filamentous melt 21 and the sheet melt 22, has the advantages of uniform size of the filamentous melt, low cost, convenience in automatic integration and the like, and has the advantage of controllable breaking effect of the sheet melt.
Furthermore, the through hole 24 is disposed on the sheet-shaped melt 22, and the sheet-shaped melt 22 forms a narrow connection portion at the formed through hole 24 to form the fusing portion 25 of the fuse element, so that the fuse element 20 can play a good role of power-off protection, in the embodiment of the present invention, at least one through hole 24, and more preferably a plurality of through holes are preferably disposed on the sheet-shaped melt 22 of the fuse element 20, so that the narrow connection portion 24 is formed at the position of the fuse element 20 where the through hole is disposed, so as to reduce the cross-sectional area through which the current passes, increase the resistance of the narrow connection portion, and enable the current to pass through the narrow connection portion to play a role of temperature rise, thereby ensuring that the narrow connection portion constitutes the fusing portion 25 of the fuse element 20. In addition, in the embodiment with a single through hole 24, the ratio of the width of the narrow connecting portion to the width of the through hole can be designed according to the actual application requirement.
Therefore, the present invention can control the position of the breaking point of the fuse element (i.e., the fuse portion having a weak structure) by providing the through hole 24. Moreover, by changing the opening size and shape of the through hole, the segmentation capability of the fuse element can be adjusted, the thinner the fusing part is, the weaker the structure is, the stronger the segmentation capability is, the higher the impedance after segmentation is, and the better the isolation effect is. Wherein, the through hole 24 can be formed in the middle of the sheet-like melt 22 by a punching process. The through hole 24 may be an elliptical hole, a circular hole, a hexagonal hole or a capsule hole, or any other shape; the sheet melt 22 may be rectangular, oval, or circular, or any other shape. The shape and location of the through-holes 24 and the sheet melt 22 can be arranged according to the requirements of the sectioning point and the sectioning capability of the fuse element, and the present invention is not limited thereto, but only to a few common, easy-to-implement or effective embodiments.
As shown in fig. 1, in example 1, a rectangular sheet-like melt 22 was formed in the middle of a filament-like melt 21, the long side of the rectangular sheet-like melt 22 was parallel to the longitudinal direction of the fuse element, a through-hole 24 was formed in the middle of the rectangular sheet-like melt 22, the through-hole 24 was an elliptical hole having a long axis extending in the longitudinal direction of the fuse element 20, the center of the through-hole 24 coincided with the center of the sheet-like melt 22, the long axis of the through-hole 24 accounted for more than half the length of the sheet-like melt 22, and the short axis of the through-hole 24 accounted for more than half the width of the sheet-like. The narrow connecting portion, where the distance between both sides of the through hole 24 and the long side of the sheet-like melt 22 is the shortest, has the smallest cross-sectional area, and constitutes the fusing portion 25 of the fuse element 20.
In the fuse element embodiment of the present invention, the fuse element may be made of a metal selected from silver or copper, or the fuse element may be made of a metal alloy selected from silver/copper or copper/tin, or the fuse element may be made by plating tin on copper or plating silver on copper.
Furthermore, in the embodiment of the present invention, a metal layer may be further disposed on the fusing portion of the fuse element, and the material of the metal layer is preferably tin, so as to reduce the melting point of the fusing portion and improve the protection effect of the fuse.
With reference to fig. 2, 4 and 5, the method for manufacturing the fuse element in embodiment 1 is illustrated, and the main steps are as follows:
step 101: providing a filamentary melt 21, as shown in FIG. 4;
step 102: stamping the middle section of the filiform melt 21, and forming a rectangular sheet melt 22 at the stamping position, wherein the long side of the rectangular sheet melt 22 is parallel to the length direction of the filiform melt 21; and
step 103: an oval through hole 24 is punched in the middle of the sheet-like melt 22 to form the fuse element 20, wherein the long axis direction of the oval through hole 24 extends along the length direction of the filament-like melt 21, and narrow connecting portions with the shortest distance and the smallest cross-sectional area are formed between the two long sides of the sheet-like melt 22 and the two sides of the through hole 24 respectively to form a fusing portion 25 of the fuse element 20.
As shown in fig. 3, in step 102, the step of pressing the filamentous melt 21 may further be: both the upper and lower opposite sides of the filamentary melt 21 are punched to form two recessed portions 23 of the same depth.
Through the manufacturing method, the sheet-shaped melt and the through holes are respectively formed on the filamentous melt in a stamping and punching mode, the filamentous melt and the sheet-shaped melt are integrated on the same fuse element, the manufacturing process is simple, stamping and punching equipment is ready, the operability is high, the cost is low, the characteristics of the filamentous melt are still reserved at two ends of the fuse element, the fuse element is convenient to assemble through a metal cap and a protective carrier of a fuse device, and the assembly equipment is ready, so that the fuse element manufactured by the manufacturing method has the advantages of a protofilament fuse and an original sheet fuse, the processing is convenient, the cost is low, and the breaking point and the segmenting effect can be controlled.
Referring again to fig. 6 and 7, two other embodiments of fuse element 11 of the present invention are illustrated: example 2 and example 3.
Example 2:
as shown in fig. 6, the fuse element 20 includes a fuse element 21, a sheet-like fuse element 22 formed in a middle section of the fuse element 21, and two first through holes 24A formed in the sheet-like fuse element 22, the two first through holes 24A are arranged in a row of opening structures along a short side direction of the sheet-like fuse element 22, and are symmetrically opened on the rectangular sheet-like fuse element 22 with an axis of the fuse element 21 as a center of symmetry, and the two first through holes 24A are all elliptical holes having long axes extending in a length direction of the fuse element 20. A narrow connecting portion is formed between the two first through holes 24A, and a narrow connecting portion is formed between each first through hole 24A and the long side of the sheet-like melt 22 adjacent to the first through hole, so that three narrow connecting portions are formed in total, and the three narrow connecting portions are the narrowest connecting portions with the smallest cross-sectional area on the sheet-like melt 22, and constitute the first fusing portion 25A of the fuse element 20.
The schematic side structure of the fuse element of this embodiment 2 is the same as the schematic side structure of the fuse element of embodiment 1 (see fig. 3), and similarly, a concave portion 23 is formed by punching on both opposite sides of the filamentary melt 21, and the shapes and sizes of the two concave portions 23 are the same, and the positions are symmetrical, so that the sheet-like melt 22 is uniformly formed on the middle section of the filamentary melt 21, and the fuse element 20 is kept relatively uniform in the external dimensions.
Example 3:
as shown in fig. 7, the fuse element 20 includes a filamentous melt 21, a sheet-like melt 22 formed in the middle of the filamentous melt 21, and six first through holes 24A formed in the sheet-like melt 22, where the six first through holes 24A are arranged in two rows to form a three-row open structure, two through holes 24A in each row of open structure are arranged along the short side of the sheet-like melt 22, and two adjacent rows of open structures are arranged along the long side direction of the sheet-like melt 22, so that the six first through holes 24A are uniformly arranged in a rectangular matrix on the sheet-like melt 22. The narrow connecting portion between the first through holes 24A in the same row is the narrowest connecting portion on the sheet-like melt 22, constituting the first fusing portion 25A of the fuse element 20; meanwhile, the narrow connection point between the two first through holes 24A at the head and tail of each row of the first through holes 24A and the long side of the sheet-like melt 22A on the near side also constitutes the narrowest connection point on the sheet-like melt 22 with the smallest cross-sectional area, and constitutes the first fusing part 25A of the fuse element 20.
The schematic side structure of the fuse element of this embodiment 3 is the same as the schematic side structure of the fuse element of embodiment 1 (see fig. 3), and similarly, a concave portion 23 is formed by punching on both sides of the upper and lower opposite sides of the filamentary melt 21, and the shapes and sizes of the two concave portions 23 are the same, and the positions are symmetrical, so that the sheet-like melt 22 is uniformly formed on the middle section of the filamentary melt 21, and the fuse element 20 is kept relatively uniform in the outer dimensions.
Example 4:
with continued reference to FIGS. 8 and 9, yet another embodiment of the fuse element of the present invention is illustrated: the structure and the manufacturing method of the embodiment 4 are schematically illustrated. Fig. 8 is a schematic top view of the structure of the fuse element of embodiment 4 in the manufacturing process, and fig. 9 is a schematic side view of the structure of the completed fuse element of embodiment 4.
As shown in fig. 8, the method for manufacturing the fuse element 20 includes:
step 201: providing a filamentous melt 21;
step 202: stamping the middle section and two ends (positions close to the two ends) of the filamentous melt 21, forming a rectangular first flaky melt 22A at the middle section, and forming rectangular second flaky melts 22B at the two ends respectively, wherein the long sides of the rectangular first flaky melt 22A and the rectangular second flaky melt 22B are parallel to the length direction of the filamentous melt 21; and
step 203: two oval first through holes 24A are punched in the middle of the first sheet-like melt 22A, and two oval second through holes 24B are punched in the middle of the second sheet-like melt 22B, respectively, to form the fuse element 20. Wherein, the major axis directions of the two elliptic first through holes 24A and the two elliptic second through holes 24B extend along the length direction of the filamentous melt 21. The two first through holes 24A are arranged in a row of hole structures along the short side direction of the sheet-shaped melt 22, and the two first through holes 24A are symmetrically arranged on the rectangular first sheet-shaped melt 22A in a left-right manner with the axis of the filament-shaped melt 21 as the center of symmetry.
Three narrow connecting portions having the same width and the same cross-sectional area are formed between the two first through holes 24A and the long side of the sheet-like melt 22A on the near side, and the three narrow connecting portions are the narrowest connecting portion having the smallest cross-sectional area on the first sheet-like melt 22, and constitute the first fusion portion 25A of the fuse element 20.
The two sides of each second through hole 24A and the two long sides of the first sheet-like melt 22A form a narrow connection portion with the shortest distance therebetween, and constitute a second fusing portion 25B of the fuse element 20.
The area of the first flaky melt 22A formed in the middle section of the punched filamentous melt 21 is larger than the area of the second flaky melt 22B formed at the two ends of the punched filamentous melt 21, the area of the middle section is larger, and the formed flaky melt is thinner, so that fusing is facilitated. The major axis length of the oval first through hole 24A opened in the first sheet-like melt 22A is equivalent to the major axis length of the oval second through hole 24B opened in the second sheet-like melt 22B, but the minor axis length of the oval first through hole 24A is smaller than the minor axis length of the second through hole 24B, so that the first through hole 24A is smaller than the second through hole 24B.
As shown in fig. 9, in step 202, the step of pressing the filamentous melt 21 may further be: all carry out the punching press to the upper and lower relative both sides of this filiform fuse-element 21's middle section and both ends position, form the first depressed part 23A of two that the degree of depth is the same in the both sides of middle section, respectively form the same two second depressed parts 23B of degree of depth in the both sides at both ends, and first depressed part 23A is equivalent with the degree of depth of second depressed part 23B, the arc shape of natural transition is presented with linking department of precursor form fuse-element in the both ends of first depressed part 23A, the preparation of stamping die of being convenient for, second depressed part 23B is the arc that the middle part is narrower than both ends, the arc shape can let middle sectional area minimum, be convenient for control fusing position. In addition, the first recessed portion 23A and the second recessed portion 23B should be formed so as to keep the external dimensions of the fuse element 20 relatively uniform as much as possible.
Example 5:
referring again to fig. 10 and 11, a further embodiment of the fuse element of the present invention is illustrated: the structure and the manufacturing method of the embodiment 5 are schematically illustrated. Fig. 10 is a schematic top view of the structure of the fuse element of embodiment 5 in the manufacturing process, and fig. 11 is a schematic side view of the structure of the completed fuse element of embodiment 5.
As shown in fig. 10, the method for manufacturing the fuse element 20 includes:
step 301: providing a filamentous melt 21;
step 302: stamping the middle section of the filamentous melt 21 to form an oval sheet-shaped melt 22 at the stamping position, wherein the long axis of the oval sheet-shaped melt 22 extends along the length direction of the filamentous melt 21; and
step 303: an oval through hole 24 is punched in the middle of the sheet-like melt 22 to constitute the fuse element 20. The major axis of the oval through hole 24 extends in the longitudinal direction of the filament melt 21, and narrow connection portions are formed between both sides of the sheet melt 22 and both sides of the through hole 24, respectively, to constitute the fusing portion 25 of the fuse element 20. The major axis of the oval through-hole 24 is more than half of the major axis of the oval sheet melt 22, and the minor axis of the oval through-hole 24 is more than half of the minor axis of the oval sheet melt 22.
As shown in fig. 11, in step 302, the step of pressing the filamentous melt 21 may further be: both the upper and lower opposite sides of the filamentary melt 21 are punched to form two recessed portions 23 of the same depth.
Referring again to fig. 12 and 13, two other embodiments of the fuse element 11 of the present invention are illustrated: example 6 and example 7.
Example 6:
as shown in fig. 12, the fuse element 20 includes a filament-like melt 21, a sheet-like melt 22 formed in a middle section of the filament-like melt 21, and two first through holes 24A formed in the sheet-like melt 22, and the sheet-like melt 22 is an elliptical sheet body having a major axis extending in a longitudinal direction of the fuse element 20. The two first through holes 24A are respectively elliptical holes extending in the longitudinal direction of the fuse element 20, and the two first through holes 24A are arranged in a row of open hole structures in the minor axis direction of the sheet-like melt 22 and symmetrically opened on the elliptical sheet-like melt 22 with the axis of the filament-like melt 21 as the center of symmetry. Three narrow connecting portions with equal width and cross-sectional area are formed between the two first through holes 24A and the long side of the sheet-like melt 22A on the near side, and the three narrow connecting portions are the narrowest connecting portions with the smallest cross-sectional area on the sheet-like melt 22, and constitute the first fusing portion 25A of the fuse element 20.
The schematic side view of the fuse element of this embodiment 6 is the same as the schematic side view of the fuse element of embodiment 5 (see fig. 11), and similarly, a concave portion 23 is formed by punching on both sides of the upper and lower opposite sides of the filamentary melt 21, and the shapes and sizes of the two concave portions 23 are the same, and the positions are symmetrical, so that the sheet-like melt 22 is uniformly formed on the middle section of the filamentary melt 21, and the fuse element 20 is kept relatively uniform in the outer dimensions.
Example 7:
as shown in fig. 13, the fuse element 20 includes a fuse element 21, a sheet-like melt 22 formed in a middle section of the fuse element 21, and four first through holes 24A formed in the sheet-like melt 22, the sheet-like melt 22 is an elliptical sheet body having a major axis extending in a longitudinal direction of the fuse element 20, and the four first through holes 24A are elliptical holes extending in the longitudinal direction of the fuse element 20, respectively. Further, the four first through holes 24A have a row of hole structures formed by two holes arranged in the short axis direction of the sheet-like melt 22, and three narrow connecting portions with equal width and cross-sectional area are formed between the two first through holes 24A in the row and between the two first through holes 24A and the long side of the sheet-like melt 22A on the near side, and the three narrow connecting portions are the narrowest connecting portion with the smallest cross-sectional area on the sheet-like melt 22, and form the first fusing portion 25A of the fuse element 20. The other two of the four first through holes 24A are respectively arranged at two ends of the long axis of the sheet melt 22 in a left-right symmetrical manner with the short axis of the elliptical sheet melt 22 as the symmetrical center, so that the four first through holes 24A are uniformly arranged on the elliptical sheet melt 22 in an elliptical matrix arrangement manner.
The schematic side view of the fuse element of this embodiment 7 is the same as the schematic side view of the fuse element of embodiment 1 (see fig. 11), and similarly, a concave portion 23 is formed by punching on both sides of the upper and lower opposite sides of the filamentary melt 21, and the shapes and sizes of the two concave portions 23 are the same, and the positions are symmetrical, so that the sheet-like melt 22 is uniformly formed on the middle section of the filamentary melt 21, and the fuse element 20 is kept relatively uniform in the outer dimensions.
Example 8:
with continued reference to fig. 14 and 15, yet another embodiment of the fuse element of the present invention is illustrated: embodiment 8 is a schematic structural diagram and a schematic diagram of a manufacturing method thereof. Fig. 14 is a schematic top view of the structure of the manufacturing process of the fuse element of embodiment 8, and fig. 15 is a schematic side view of the structure of the completed fuse element of embodiment 8.
As shown in fig. 14, the method for manufacturing the fuse element 20 includes:
step 401: providing a filamentous melt 21;
step 402: stamping the middle section and two ends (positions close to the two ends) of the filamentous melt 21, forming an elliptical first flaky melt 22A at the middle section, and forming elliptical second flaky melts 22B at the two ends respectively, wherein the long axes of the elliptical first flaky melt 22A and the elliptical second flaky melt 22B both extend along the length direction of the filamentous melt 21; and
step 403: two oval first through holes 24A are punched in the middle of the first sheet-like melt 22A, and two oval second through holes 24B are punched in the middle of the second sheet-like melt 22B, respectively, to form the fuse element 20. Wherein, the major axis directions of the two elliptic first through holes 24A and the two elliptic second through holes 24B extend along the length direction of the filamentous melt 21. The two first through holes 24A are arranged in a row of open pore structures along the short side direction of the sheet-shaped melt 22, and the two first through holes 24A are symmetrically arranged on the elliptical first sheet-shaped melt 22A in a left-right manner with the axis of the filament-shaped melt 21 as the center of symmetry.
Three narrow connecting portions having the same width and the same cross-sectional area are formed between the two first through holes 24A and the long side of the sheet-like melt 22A on the near side, and the three narrow connecting portions are the narrowest connecting portion having the smallest cross-sectional area on the first sheet-like melt 22, and constitute the first fusion portion 25A of the fuse element 20.
Narrow connecting portions are formed between both sides of each second through hole 24A and both ends of the short axis of the first sheet-like melt 22A at the shortest distance, and constitute second fusing portions 25B of the fuse element 20.
Wherein, the area of the first sheet-shaped melt 22A formed at the middle section of the punched filamentous melt 21 is larger than the area of the second sheet-shaped melt 22B formed at the two ends of the punched filamentous melt 21. The major axis length of the oval first through hole 24A opened in the first sheet-like melt 22A is equivalent to the major axis length of the oval second through hole 24B opened in the second sheet-like melt 22B, but the minor axis length of the oval first through hole 24A is smaller than the minor axis length of the second through hole 24B, so that the first through hole 24A is smaller than the second through hole 24B.
As shown in fig. 15, in step 402, the step of pressing the filamentous melt 21 may further be: the middle section and the two opposite sides of the two ends of the filamentous fused mass 21 are punched, two first concave parts 23A with the same depth are formed on the two sides of the middle section, two second concave parts 23B with the same depth are formed on the two sides of the two ends, and the depth of the first concave part 23A is equal to that of the second concave part 23B, so that the fuse elements 20 are kept relatively uniform in the shape dimension.
It should be noted that the structures, ratios, sizes, and the like shown in the drawings attached to the present specification are only used for matching the disclosure of the present specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions of the present invention, so that the present invention has no technical essence, and any structural modification, ratio relationship change, or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (11)
1. A method for manufacturing a fuse element, comprising the steps of:
providing a filamentous melt;
partially stamping the filamentous melt, and forming a sheet-shaped melt at the stamping position; and
punching a forming through hole on the sheet-shaped melt, wherein a narrow connecting part is formed at the forming through hole of the sheet-shaped melt to form a fusing part of the fuse element;
wherein the step of partially stamping the filamentary melt comprises: stamping the middle section of the filamentous melt;
the step of punching a through hole on the sheet-like melt includes: punching a plurality of through holes on a sheet-shaped melt formed by punching the middle section of the filamentous melt, and forming a narrow connecting part with the smallest cross section area at the through hole to form a fusing part of the fuse element; the through holes are arranged in the width direction of the fuse element to form at least one row of open pore structures, and the cross sectional areas of the through holes in the same row and the narrow connecting parts between the through holes and the long edges of the sheet-shaped melt on the adjacent side are equal.
2. The method of making a fuse element according to claim 1, wherein the step of partially stamping the filamentary melt comprises: and respectively stamping two opposite sides of the filiform melt.
3. The method of claim 2, wherein the stamping depth is the same for both sides.
4. The method of making a fuse element according to claim 1, wherein the step of partially stamping the filamentary melt comprises: and stamping a plurality of positions in the filamentous fused mass.
5. The method of claim 4, wherein the plurality of locations includes at least a middle portion and two ends of the filamentary melt.
6. A fuse element comprising the fuse element manufactured by the manufacturing method according to any one of claims 1 to 5.
7. The fuse element of claim 6, wherein the fuse element comprises a filamentary melt, a sheet melt formed on the filamentary melt, and a through hole formed on the sheet melt.
8. The fuse element of claim 7, wherein opposing sides of the filamentary melt each form a depression where the sheet melt is formed.
9. The fuse element of claim 8 wherein the recessed portions on both sides are of the same depth.
10. The fuse element of claim 8 or 9, wherein the recessed portion is arcuate with a central portion narrower than both ends.
11. The fuse element of claim 7 wherein the via is an elliptical hole having a major axis extending along a length of the fuse element.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810076920.XA CN108321039B (en) | 2018-01-26 | 2018-01-26 | Fuse element and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810076920.XA CN108321039B (en) | 2018-01-26 | 2018-01-26 | Fuse element and manufacturing method thereof |
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| CN108321039A CN108321039A (en) | 2018-07-24 |
| CN108321039B true CN108321039B (en) | 2020-03-17 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194620A (en) * | 2010-03-03 | 2011-09-21 | 矢崎总业株式会社 | Fuse and manufacturing method of the same |
| CN107481902A (en) * | 2017-09-29 | 2017-12-15 | 电安科技（嘉兴）有限公司 | Fuse unit and its fuse element |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005158352A (en) * | 2003-11-21 | 2005-06-16 | Jun Mizuno | Electric wire with fuse |
| JP5026914B2 (en) * | 2007-10-17 | 2012-09-19 | 太平洋精工株式会社 | Fuse element and fusible link using this fuse element |
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2018
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102194620A (en) * | 2010-03-03 | 2011-09-21 | 矢崎总业株式会社 | Fuse and manufacturing method of the same |
| CN107481902A (en) * | 2017-09-29 | 2017-12-15 | 电安科技（嘉兴）有限公司 | Fuse unit and its fuse element |
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| CN108321039A (en) | 2018-07-24 |
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