A patch fuse for an adjustable low-power power supply

Abstract

The present invention relates to a patch fuse for a small-power power supply that is adjustable. The present invention includes a housing, a first end-face electrode, a second end-face electrode, a metal card slot, a fuse body, and a movable slotted cover plate; the first end-face electrode and the second end-face electrode are respectively fixed at the left and right ends of the bottom of the housing and are all or partially exposed outside the housing; the metal card slot is located in the inner cavity of the housing, and the two ends are connected to the first end-face electrode and the second end-face electrode; openings are provided at the left and right ends of the housing, the width of the openings is equal to the diameter of the fuse body, and the height of the openings can make the metal contact piece of the fuse body touch the metal card slot; the fuse body is snap-connected to the left and right ends of the housing and is movably snap-connected to the movable slotted cover plate. The present invention can quickly and conveniently adjust the fusing current of the fuse without replacing the fuse body.

Description

Technical Field

[0001] The present invention relates to the technical field of small power supply circuit protection devices, and more specifically, to a patch fuse for small power supply that is adjustable. Background Art

[0002] With the rapid development of power electronics technology, power electronic devices are becoming increasingly closely related to people's work and life. And all electronic devices rely on a reliable power supply, and small power supplies are also applied in various occasions. More and more power supplies have very strict requirements for the protection circuit, and fuses often restrict the protection and application of small power supplies.

[0003] Fuses are usually used as circuit protection devices and are electrically connected to the components to be protected in the circuit. Generally, a fuse has its unique rated current capacity, which is determined by the metal components that make up the fuse. With the development of the current electronics industry, there are increasingly high requirements for miniaturization and integration of components in the field of power supply products, and the volume of chip protection components has also been greatly reduced. At the same time, whether it is electronic products, intelligent devices or various power equipment in the industrial field, a power supply is required. There are increasingly high requirements for the miniaturization and reliability of fuses for small power supplies. Especially in power supply circuit protection, the fuse needs to meet the strict requirements of the equipment: its characteristics should be clean, the resistance after breaking should be high, the entire fusing process should be carried out inside the package, the arc suppression characteristics should be good, and it should be able to withstand shocks and vibrations.

[0004] The existing patch fuses are still in a stage where a fuse can only be used in a specific power supply circuit, or when the fuse burns out, only another fuse of the same model can be replaced. The problems brought about by this state are that only professionals can replace it, and each replacement is very troublesome; at the same time, since most patch fuses are welded, and the life of the PCB pads is limited, multiple weldings will also cause the PCB of the power supply circuit to be damaged due to heat; at the initial stage of product circuit design, it is necessary to test various indicators of the power supply and adjust the fusing current of the fuse to achieve the purpose of debugging various states; some fuses cannot be truly fused due to the problem of the fusing space. Therefore, it is of great significance to study a patch fuse for small power supply that is adjustable, which can quickly and conveniently adjust the fusing current of the fuse without replacing the fuse body, or can timely replace the fuse wire when the fuse in the circuit burns out. Summary of the Invention

[0005] In view of the above deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a patch fuse for a low-power power supply that can be adjusted. Without replacing the fuse body, the fusing current of the fuse can be quickly and conveniently adjusted, and the fuse wire can be replaced in time when the fuse of the circuit melts.

[0006] The technical solution adopted by the present invention to achieve the above object is: a patch fuse for a low-power power supply that can be adjusted, including a housing, a first end face electrode, a second end face electrode, a metal card slot, a fuse body, and a moving slotted cover plate;

[0007] The first end face electrode and the second end face electrode are respectively fixed at the left and right ends of the bottom of the housing and are all or partially exposed outside the housing; the metal card slot is located in the inner cavity of the housing, and both ends are connected to the first end face electrode and the second end face electrode; openings are provided at the left and right ends of the housing, the width of the opening is equal to the diameter of the fuse body, and the height of the opening can make the metal contact piece of the fuse body touch the metal card slot; the fuse body is snap-connected to the left and right ends of the housing and is movably snap-connected to the moving slotted cover plate.

[0008] The housing includes an upper substrate, a lower substrate, a left substrate, and a right substrate; the upper substrate is connected to the lower substrate, and the left end of this connection structure is connected to the left substrate and the right end is connected to the right substrate.

[0009] The upper substrate includes a front cover plate, an upper cover plate, and a rear cover plate that are integrally formed; the bottom of the front cover plate and the rear cover plate is connected to the lower substrate, and the left end of the front cover plate, the upper cover plate, and the rear cover plate is connected to the left substrate, and the right end is connected to the right substrate.

[0010] The inner cavity of the housing is filled with a heat-insulating and insulating filler.

[0011] The metal card slot includes an elastic element and two connecting parts; the elastic element is connected between the two connecting parts; each connecting part includes a metal contact surface, a left metal card, and a right metal card, the metal contact surface is fixed to the bottom surfaces of the left metal card and the right metal card for connecting to the first end face electrode or the second end face electrode, the distance between the left metal card and the right metal card is the thickness of the metal contact piece of the fuse body, and two semi-circular spherical surfaces are provided on the opposite sides of the left metal card and the right metal card, and the spherical surfaces are arranged in an intersecting layout.

[0012] The upper parts of the left metal card and the right metal card are of an outwardly inclined side opening type.

[0013] Metal conductors are provided below the lowest spherical surfaces of the left metal card and the right metal card, and the metal conductors are flush with the tangents of their corresponding spherical surfaces.

[0014] The fuse body includes metal contact pieces, rotating devices, arc extinguishing cavities, fuse wires, and an outer cavity; there are two rotating devices, which are respectively and hermetically connected to both ends of the arc extinguishing cavity; the rotating devices are circular structures, and metal contact pieces are connected to both opposite ends; the metal contact pieces are located at the positions where the rotating devices are connected to the arc extinguishing cavity; several fuse wires of the same grade or different grades are connected between two metal contact pieces connecting different rotating devices, the fuse wires are located inside the arc extinguishing cavity, and arc extinguishing materials are arranged inside the arc extinguishing cavity; the outside of the arc extinguishing cavity is wrapped with the outer cavity.

[0015] Grooves matching the openings are respectively arranged at both ends of the outer cavity.

[0016] The fuse body further includes a handle, which is made of insulating material and is connected to the other side of the rotating device relative to the arc extinguishing cavity.

[0017] The present invention has the following advantages and beneficial effects:

[0018] 1. The present invention can quickly and conveniently adjust the fusing current of the fuse without replacing the fuse body, and when the fuse in the circuit blows, the fuse wire can be replaced in time, improving the multiple use performance, adjustable performance of the fuse in the circuit, improving the operation performance, reducing the R & D difficulty of the circuit, reducing the R & D cost, ensuring the reliability of R & D, and being beneficial to the testing and use of the product.

[0019] 2. The fuse body structure of the present invention realizes that a fuse has multiple identical or different fusing currents, and different fusing currents can be selected according to the actual application occasions, improving the selectivity of the fuse.

[0020] 3. The fuse body structure of the present invention can continue to be used without replacing the fuse when fusing occurs at one place, improving the usability of the fuse and increasing the repeatability of the fuse; moreover, without replacing the fuse body, the integrity of the PCB structure is ensured and the service life is extended.

[0021] 4. Each fuse wire of the present invention has an independent arc extinguishing cavity, ensuring the quick and reliable fusing of the fuse wire, ensuring the quick response of the fuse, and improving the reliability of the equipment.

[0022] 5. The outer cavity of the present invention encloses each independent arc extinguishing cavity, effectively preventing foreign objects from entering, ensuring the performance index of the fuse, preventing the arc extinguishing cavity from contacting other objects, and improving the stability of the fuse.

[0023] 6. The present invention adopts the structure of a fuse metal slot. Each metal slot has a protruding part, and at the same time, an elastic element is connected to the middle of the metal slot. This structure is beneficial to the locking of the metal contact piece, increases the operability of the fuse, ensures the effective contact of the fuse, and improves the reliability of the fuse.

[0024] 7. The present invention adopts the structure of a handle and a moving slot, which enhances the practical performance of the fuse and makes the operation simple and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of the overall structure of the fuse of the present invention;

[0026] Figure 2 is a sectional view of the fuse of the present invention;

[0027] Figure 3 is a side view of the fuse of the present invention;

[0028] Figure 4 is a schematic diagram of the metal slot of the present invention;

[0029] Figure 5 is a structural diagram of the fuse body of the present invention.

[0030] Among them, 1 is the upper substrate, 2 is the lower substrate, 3 is the left substrate, 4 is the right substrate, 5 is the first end face electrode, 6 is the second end face electrode, 7 is the metal slot, 8 is the fuse body, and 9 is the moving slot cover plate. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following further describes the present invention in detail with reference to the drawings and embodiments.

[0032] As Figures 1-3 shown, a patch fuse for an adjustable low-power power supply includes a housing, a first end face electrode 5, a second end face electrode 6, a metal slot 7, a fuse body 8, and a moving slot cover plate 9; among them, the housing includes an upper substrate 1, a lower substrate 2, a left substrate 3, and a right substrate 4; the upper substrate 1 is connected to the lower substrate 2, and the left end of this connection structure is connected to the left substrate 3, and the right end is connected to the right substrate 4. The upper substrate 1 includes a front cover plate, an upper cover plate, and a rear cover plate that are integrally formed;

[0033] The bottom of the front cover plate and the rear cover plate is connected to the lower substrate, and the left ends of the front cover plate, the upper cover plate, and the rear cover plate are connected to the left substrate, and the right ends are connected to the right substrate. The upper substrate 1, the lower substrate 2, the left substrate 3, and the right substrate 4 are connected together to form a cavity or a cavity with a filler. The first end face electrode 5 and the second end face electrode 6 are connected to the front cover plate of the upper substrate 1 and a part of the rear cover plate, and are simultaneously connected to the left substrate 3 and the right substrate 4. The first end face electrode 5 and the second end face electrode 6 can be wrapped outside the cover plate and the substrate or embedded inside the cover plate and the substrate to form an integral body with the cover plate and the substrate. The metal card slot 7 is connected to the first end face electrode 5 and the second end face electrode 6, and can be wrapped by the filler in the cavity. This filler is a heat-insulating and insulating material. The fuse body 8 is connected to the left substrate 3 and the right substrate 4, and is simultaneously movably connected to the movable slotted cover plate 9.

[0034] The upper substrate 1 can cold-press or hot-press the raw material through a forming die with a specific shape to form the required contact surface, and then cure and form; or the cavity can also be realized by etching or machining after curing the material first. If necessary, a heat-insulating and insulating filler can be added to the cavity, and the volume of the filler should consider the movement track of the fuse body 8. The upper substrate 1 mainly includes Figure 1 the front cover plate, the rear cover plate, and the upper cover plate in the overall schematic diagram of the fuse shown, and the three form a cavity that wraps around three sides of the fuse body 8; or it is composed of the inner wall fillers of the front cover plate, the rear cover plate, and the upper cover plate, which wrap around three sides of the fuse body 8, but ensure that there is a slot with the same size as the fuse body 8 in the movable slotted cover plate 9 or the inner wall fillers of the front cover plate, the rear cover plate, and the upper cover plate to ensure the movement of the fuse body 8. The upper substrate 1 mainly provides peripheral structural protection for the fuse body 8 to prevent other foreign objects from bumping into the fuse body 8 and affecting the performance and life of the fuse.

[0035] The lower substrate 2 can cold-press or hot-press the raw material through a forming die with a specific shape to form the required contact surface, and then cure and form; or the cavity can also be realized by etching or machining after curing the material first. If necessary, a heat-insulating and insulating filler can be added to the cavity. The lower substrate 2 is mainly Figure 1 the carrier of the first end face electrode 5 and the second end face electrode 6 shown, which plays a role in fixing and carrying the first end face electrode 5 and the second end face electrode 6, and cooperates with the upper substrate 1 to form a cavity open on both the left and right sides. Like the upper substrate 1, it can be an empty cavity or a cavity with a filler, but the operating space between the metal card slot 7 and the fuse body 8 should be ensured to ensure the free movement of the fuse body 8.

[0036] The left substrate 3 and the right substrate 4 mainly form a cavity with the upper substrate 1 and together with the lower substrate 2 form the outer shell of the fuse, which plays the role of protecting the fuse body 8 and the role of a bracket. The surfaces of the left substrate 3 and the right substrate 4 are respectively connected to the first end face electrode 5 and the second end face electrode 6, which can be seamlessly connected or the end face electrodes are wrapped on the outer surfaces of the left substrate 3 and the right substrate 4. The left substrate 3 and the right substrate 4 need to have openings, the size of which is the same as the diameter of the fuse body 8, and at the same time the height is not less than the just-touching distance between the metal contact piece 8-1 and the metal card slot 7 in the fuse body 8, ensuring that the fuse body 8 can rotate smoothly and at the same time ensuring the normal movement of the fuse body 8.

[0037] The manufacturing methods of the first end face electrode 5 and the second end face electrode 6 are as follows: A metal thin layer is formed on the upper substrate 1, the lower substrate 2, the left substrate 3 and the right substrate 4 by means of pressing a metal copper sheet or sputtering electroplating, and then the end face electrodes are etched out of the metal thin layer according to the required dimensions. These end face electrodes can be wrapped around the upper substrate 1, the lower substrate 2, the left substrate 3 and the right substrate 4, or embedded in the upper substrate 1, the lower substrate 2, the left substrate 3 and the right substrate 4. The first end face electrode 5 and the second end face electrode 6 are mainly used for welding with the pads of the PCB to ensure the effective combination of the fuse and the PCB.

[0038] As Figure 4 shown, the metal card slot 7 includes an elastic element 7-4 and two connecting parts, and the elastic element is connected between the two connecting parts. The structures of the two connecting parts are the same, and each includes a left metal card 7-1, a metal connecting surface 7-2 and a right metal card 7-3. The main functions of the metal card slot 7 are: (1) to make electrical connections with the first end face electrode 5 and the second end face electrode 6; (2) to contact and lock with the metal contact piece 8-1 in the fuse body 8 (as Figure 5 shown). The metal card slot 7 ensures the electrical connection of the fuse, improves the reliability of the fuse, and ensures its stability.

[0039] The left metal card 7-1 and the right metal card 7-3 have semi-circular spherical surfaces, and at the bottommost ball, a contact metal conductor is added with the spherical surface as the tangent. The distance between the left metal card 7-1 and the right metal card 7-3 is the thickness of the metal contact piece 8-1, and the spherical surfaces of the left metal card 7-1 and the right metal card 7-3 are in an intersecting layout. At the same time, the upper halves of the left metal card 7-1 and the right metal card 7-3 are in an inclined side opening shape and can be cast by a forming die.

[0040] The metal contact surface 7-2 is connected to the left metal card 7-1 and the right metal card 7-3 by electroplating or other means, and is also connected to the first end face electrode 5 and the second end face electrode 6, ensuring effective connection.

[0041] The elastic element 7-4 is on the side of the left metal card 7-1 / right metal card 7-3, ensuring the pressing of the metal contact piece 8-1.

[0042] As Figure 5 shown, the fuse body 8 includes a metal contact piece 8-1, a rotating device 8-2, a handle 8-3, an arc extinguishing cavity 8-4, a fuse wire 8-5, and an outer cavity 8-6. The fuse body 8 mainly ensures the installation of different fuse wires or multiple identical fuse wires, the installation of metal contact pieces, as well as the installation of the arc extinguishing cavity and the outer cavity, etc.

[0043] The metal contact piece 8-1 is connected to the fuse wire 8-5 and is located at the position where the rotating device 8-2 is connected to the arc extinguishing cavity 8-4. The fuse can install 1 to N identical or different rated fuse wires 8-5 according to different requirements. The arc extinguishing cavity 8-4 forms a closed connection with the rotating device 8-2, enclosing the fuse wire 8-5 inside. At the same time, arc extinguishing materials are placed in the arc extinguishing cavity 8-4. The outer cavity 8-6 wraps around the outside of the arc extinguishing cavity 8-4 to form a sealed cavity. At the same time, the arc extinguishing cavity 8-4 is connected to the rotating device 8-2. The handle 8-3 is integrally cast with the rotating device 8-2, that is, an insulator extends a certain distance from the outside of the rotating device 8-2. Except for the metal contact piece 8-1 and the fuse wire 8-5, the above are all insulating and heat-insulating materials. Serial numbers are engraved on the rotating device 8-2, and the positions of these serial numbers are consistent with the positions of the contact pieces of the actual fuse wire 8-5, which is beneficial to the adjustment of the fuse wire 8-5. At the same time, the outer cavity 8-6 of the fuse body 8 has a groove that fits the openings of the left substrate 3 and the right substrate 4, ensuring the smooth up and down movement of the fuse body 8.

[0044] The fuse body realizes that a fuse has multiple identical or different fusing currents, can select different fusing currents according to the actual application scenarios, improving the selectivity of the fuse; can continue to be used without replacing the fuse when one fuse blows, improving the usability of the fuse and increasing the repeatability of the fuse; the arc extinguishing cavity ensures that each fuse wire has an independent arc extinguishing cavity, ensuring the quick and reliable fusing of the fuse wire, ensuring the quick response of the fuse, and improving the reliability of the equipment. The outer cavity contains each independent arc extinguishing cavity, effectively preventing foreign objects from entering, ensuring the performance indicators of the fuse, preventing the arc extinguishing cavity from contacting other objects, and improving the stability of the fuse.

[0045] The fuse body 8 mainly consists of different or identical fuse wires. By rotating the fuse body, different currents can be adjusted. When a group of fuse wires blows, the body can also be rotated to replace the fuse wires.

[0046] The movable grooved cover plate 9 is mainly made of an insulating and heat-insulating soft material, and is made into a card slot at the edge of the openings of the left substrate 3 and the right substrate 4, which is beneficial to the sealing of the fuse body 8. It mainly seals the openings of the left substrate 3 and the right substrate 4, and at the same time is used to hold the fuse body 8, ensuring that no other objects enter the interior during the use of the fuse, and at the same time ensuring that the fuse body 8 does not move, improving the reliability and stability of the fuse and ensuring the safety of the entire circuit.

[0047] The processing flow of a patch fuse for a small-power power supply that can be adjusted according to the present invention is as follows:

[0048] (1) Process the upper substrate, lower substrate, left substrate and right substrate;

[0049] (2) Electroplate or embed the first end electrode and the second end electrode on the upper substrate, lower substrate, left substrate and right substrate;

[0050] (3) Process the metal card slot, install the metal card slot on the two end electrodes and fix it;

[0051] (4) Process the fuse body, and snap a certain metal sheet of the fuse body into the metal card slot;

[0052] (5) Package the upper substrate, lower substrate, left substrate and right substrate, or seal them after adding corresponding insulating and heat-insulating objects.

Claims

1. A patch fuse for a small-power power supply that is adjustable, characterized in that, It includes a housing, a first end face electrode, a second end face electrode, a metal card slot, a fuse body and a movable slotted cover plate; The first end face electrode and the second end face electrode are respectively fixed at the left and right ends of the bottom of the housing and are all or partially exposed outside the housing; The metal card slot is located in the inner cavity of the housing, and its two ends are connected to the first end face electrode and the second end face electrode; Openings are provided at the left and right ends of the housing, the width of the openings is equal to the diameter of the fuse body, and the height of the openings can make the metal contact piece of the fuse body touch the metal card slot; The fuse body is snap-connected to the left and right ends of the housing and is movably snap-connected to the movable slotted cover plate; The metal card slot includes an elastic element and two connecting parts, and the elastic element is connected between the two connecting parts; Each connecting part includes a metal contact surface, a left metal card and a right metal card. The metal contact surface is fixed to the bottom surfaces of the left metal card and the right metal card and is used for connecting to the first end face electrode or the second end face electrode. The distance between the left metal card and the right metal card is the thickness of the metal contact piece of the fuse body, and two semi-circular spherical surfaces are provided on the relative sides of the left metal card and the right metal card, and the spherical surfaces are arranged in an intersecting manner; The fuse body includes a metal contact piece, a rotating device, an arc extinguishing cavity, a fuse wire and an outer cavity; There are two rotating devices, which are respectively hermetically connected to both ends of the arc extinguishing cavity; The rotating device is of a circular structure, and metal contact pieces are connected to both opposite ends; The metal contact piece is located at the position where the rotating device is connected to the arc extinguishing cavity; A plurality of fuse wires of the same grade or different grades are connected between two metal contact pieces connecting different rotating devices. The fuse wires are located inside the arc extinguishing cavity, and arc extinguishing materials are arranged inside the arc extinguishing cavity; The outside of the arc extinguishing cavity is wrapped with the outer cavity; 2. The surface mount fuse for small power supply adjustable according to claim 1, wherein, The housing includes an upper substrate, a lower substrate, a left substrate and a right substrate; The upper substrate is connected to the lower substrate, the left ends of the upper substrate and the lower substrate are connected to the left substrate, and the right ends are connected to the right substrate; 3. The surface mount fuse for adjustable low-power power supply according to claim 2, wherein The upper substrate includes a front cover plate, an upper cover plate and a rear cover plate which are integrally formed; The bottom of the front cover plate and the rear cover plate is connected to the lower substrate, the left ends of the front cover plate, the upper cover plate and the rear cover plate are connected to the left substrate, and the right ends are connected to the right substrate; 4. A patch fuse for a small-power power supply that is adjustable, characterized in that, The inner cavity of the housing is filled with a heat-insulating and insulating filler; 5. A patch fuse for a small power supply that is adjustable, characterized in that, The upper parts of the left metal card and the right metal card are of an outwardly obliquely opening type; 6. The patch fuse for adjustable low-power power supply according to claim 1, wherein Metal conductors are provided below the lowermost spherical surfaces of the left metal card and the right metal card, and the metal conductors are flush with the tangents of the corresponding spherical surfaces; 7. A patch fuse for a small power supply that is adjustable, characterized in that, Grooves matching the openings are respectively provided at both ends of the outer cavity; 8. A patch fuse for an adjustable low-power power supply according to claim 1, characterized in that, The fuse body further includes a handle, and the handle is made of an insulating material and is connected to the other side of the rotating device relative to the arc extinguishing cavity.

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