Fuse switch

Abstract

A fuse switch includes a base, a panel, and a protective component. The base contains several sets of circuits. The panel has toggle switches for opening and closing these circuits. The protective component has two ends connected to a power circuit and an electrical circuit, respectively, and the power circuit and electrical circuit are electrically connected only through the protective component. The protective component disconnects the circuit when the current is too high. The protective component includes a disassembly block and a fuse mounted on the disassembly block. The two ends of the fuse are connected to the power circuit and the electrical circuit, respectively. The disassembly block is detachably mounted on the base. The advantages of this invention are: by integrating the fuse into a single detachable disassembly block, this structure transforms the traditional method of manually operating small fuses one by one in a narrow chamber into an external modular replacement operation performed in an open space.

Description

Technical Field

[0001] This utility model relates to a switch, and more particularly to a fuse switch. Background Technology

[0002] Switches with instantaneous high current protection are commonly used in various electrical equipment, power distribution systems, and household appliances to prevent damage from short circuits or surge currents. These switches are typically connected in series between the power source and the load, utilizing an integrated fuse as an overcurrent protection element. Under normal operation, the switch is closed and conducting, with current flowing smoothly through the fuse to supply power to the load. If a sudden high current exceeding a set threshold occurs in the circuit, the fuse melts rapidly due to thermal effect, forcibly cutting off the circuit and protecting downstream equipment. During use, operators can control the load by switching the switch on and off, relying on the fuse for overcurrent protection. When the fuse blows, the switch housing or fuse cover needs to be opened, the blown fuse removed, and a new fuse of the same specification replaced to restore the switch's protection and conduction functions.

[0003] However, existing switches with built-in fuses are not easy to replace after the fuse fails. Fuses are often located deep within the switch housing in narrow chambers and are usually fixed by welding or tight fastening, making disassembly and replacement cumbersome. Maintenance personnel typically need to remove the entire switch from its installation position and use special tools to pry open the housing to access the fuse. Limited operating space and small parts make removing the blown fuse and installing a new one time-consuming and laborious, and can easily damage the switch's insulating shell or internal contacts during disassembly and assembly. This makes fuse replacement inconvenient, increases equipment maintenance difficulty and downtime, and causes inconvenience to users. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a fuse switch that improves the ease of fuse replacement.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fuse switch, comprising a base, a panel, and a protective component. The base contains several sets of circuits. The panel has a toggle switch for switching the circuits on and off. The protective component has two ends connected to a power supply circuit and an electrical circuit, respectively, and the power supply circuit and the electrical circuit are electrically connected only through the protective component. The protective component is used to disconnect the circuit when the current is too high. The protective component includes a disassembly block and a fuse mounted on the disassembly block. The two ends of the fuse are connected to the power supply circuit and the electrical circuit, respectively. The disassembly block is detachably mounted on the base.

[0006] The beneficial effects of this invention are as follows: By integrating the fuse into a single detachable assembly block, this structure transforms the traditional method of manually operating each small fuse individually within a narrow chamber into an external, modular replacement operation performed in an open space. During maintenance, the operator does not need to remove the entire switch from the equipment panel or use tools to pry open the switch housing. Simply remove the assembly block containing the fuse from the base, and the old fuse can be easily removed and the new fuse installed in an open, visible environment. After completion, the assembly block is reinstalled on the base. This significantly reduces reliance on operating space and specialized tools, effectively avoiding mechanical damage such as scratches on the switch's insulating casing or deformation and breakage of internal contacts that may occur due to repeated operations in confined spaces, and greatly shortens equipment downtime for maintenance. As a preferred method, the disassembly block and the base can be connected by a plug-in connection with a slide rail and a slide groove. The disassembly block has guide protrusions on both sides and a corresponding guide groove on the base, so that the disassembly block can be accurately slid in and fixed along a predetermined path. Disassembly and assembly can be completed without additional tools, further simplifying the operation.

[0007] Furthermore, the disassembly block is provided with a receiving groove for accommodating the fuse. Limiting walls are respectively provided at both ends of the receiving groove along the axial direction of the fuse, and the distance between the limiting walls on both sides of the receiving groove forms an interference fit with the fuse.

[0008] By setting limiting walls at both ends of the receiving groove to form an interference fit with the fuse, reliable initial positioning of the fuse is provided. During the movement and installation of the disassembly block as a whole, the fuse will not slide out axially from the receiving groove or deviate from the predetermined position, ensuring the success rate of modular operation and avoiding installation jamming or poor contact problems caused by fuse misalignment. As a preferred method, the receiving groove can be designed as an open long groove recessed on the surface of the disassembly block. The fuse can be pressed between the two limiting walls from the side. The limiting walls themselves can be made of a certain elastic insulating material and integrally formed with the disassembly block. The deformation recovery force of the material itself is used to clamp the metal cap at the end of the fuse, realizing quick clamping without additional parts.

[0009] Furthermore, the receiving groove is provided with an opening and a limiting arc block at both ends along the radial direction of the fuse, the fuse is inserted into the receiving groove through the opening, and the limiting arc block cooperates with the outer peripheral surface of the fuse to prevent the fuse from moving toward the limiting arc block.

[0010] This structure clearly defines the radial insertion direction of the fuse and provides a unilateral limit, allowing the operator to intuitively place the fuse into the receiving slot from the open side. The limiting arc block on the other side acts as a support and stop, preventing the fuse from coming out backward under vibration or installation thrust. This positioning method simplifies the operation of inserting and removing the fuse, achieving a convenient "place and fit" experience. As a preferred method, the inner surface curvature of the limiting arc block matches the outer circumferential curvature of the standard cylindrical fuse tube, forming an arc-shaped support that fits snugly against the fuse. The limiting arc block only needs to be placed in the middle or bottom area of ​​the receiving slot in the depth direction, leaving ample space for finger operation above, facilitating the pinching and removal of the fuse.

[0011] Furthermore, the limiting arc blocks are symmetrically arranged on both sides of the center line of the receiving groove.

[0012] Symmetrically arranged limiting arc blocks wrap around the outer periphery of the fuse from both sides, providing a balanced and stable radial constraint force. This wrapping design reliably secures the fuse to the predetermined axis of the receiving groove, ensuring precise alignment of the fuse ends with the power supply and electrical circuit connection points even under conditions of multi-directional vibration, guaranteeing the long-term stability of the electrical connection and the reliability of overcurrent protection. As a preferred option, these limiting arc blocks can be designed as two relatively independent arc-shaped springs extending from the bottom of the receiving groove. The diameter of their inscribed circles in the free state is slightly smaller than the fuse diameter, so when the fuse is inserted, the springs are slightly opened and generate a clamping force, thus adaptively securing fuses of different diameters.

[0013] Furthermore, both the power supply path and the electrical path are provided with U-shaped snap-fit ​​blocks. The snap-fit ​​blocks are made of conductive material and are respectively tightened and connected to both ends of the fuse to realize the electrical connection between the two snap-fit ​​blocks.

[0014] The power path and electrical path are each connected to both ends of the fuse via a U-shaped conductive snap-fit ​​block. This connection method utilizes the elastic deformation of the metal material itself to continuously and tightly grip the conductive caps at the fuse ends, maintaining reliable low-resistance contact even under prolonged use and temperature changes, preventing malfunctions such as loosening of contact or arcing caused by thermal expansion and contraction or mechanical vibration. As a preferred method, the edge of the U-shaped opening of the snap-fit ​​block can be machined with guide bevels or rounded corners. When the snap-fit ​​block, along with the fuse, is pushed into the base, the conductive caps at both ends of the fuse will smoothly open along these guide structures and slide into the bottom of the U-shaped snap-fit ​​block, achieving a labor-saving plug-and-play connection.

[0015] Furthermore, the spacing of the snap-fit ​​blocks gradually decreases from the opening toward its bottom.

[0016] The gradually decreasing spacing from the opening to the bottom of the snap-fit ​​block results in a progressively increasing clamping force on the conductive cap at the fuse end during insertion, ultimately maximizing the contact area and clamping force at the bottom. This progressive tightening design not only improves connection tightness but also significantly reduces wear on the fuse cap and the snap-fit ​​block itself during insertion and removal, extending the service life of the connecting components. As a preferred approach, this tapering variation can be implemented only in the lower middle section near the bottom of the two side walls of the snap-fit ​​block, while the majority of the upper section remains parallel or slightly open. This utilizes the high clamping force of the lower tapering section to ensure conductive stability during operation while retaining the initial insertion guidance convenience provided by the wider opening at the top.

[0017] Furthermore, a snap-fit ​​plate is provided between the base and the panel, and the snap-fit ​​plate is provided with a flexible snap-fit ​​block. The disassembly block is provided with a slot corresponding to the snap-fit ​​block, and the slot is located above the receiving groove.

[0018] The slot is positioned opposite the receiving groove. The engagement of the elastic block on the latch plate with the slot provides an independent secondary mechanical lock for the disassembly block, in addition to the expansion connection. This ensures the protective component is securely locked within the base during operation, effectively resisting the risk of loosening due to external impacts and long-term vibration, thus improving the overall safety and reliability of the switch. As a preferred design, the latch can be a cantilevered plastic spring with a barb at its end, while the slot on the disassembly block is a recess or through-hole matching the shape of the barb. When disassembly is required, the lock can be released simply by pressing or flicking the spring with a fingertip or a simple tool, ensuring both reliable locking and quick disassembly. Both the latch and the slot can be symmetrically arranged to improve connection stability. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model; Figure 2 This is an exploded structural diagram of an embodiment of the present utility model; Figure 3 This is a schematic diagram of the explosion structure of the protective component according to an embodiment of the present invention; Figure 4 This is a front view of the disassembly block according to an embodiment of the present utility model; Figure 5 This is a schematic diagram of the structure of the snap-fit ​​block in an embodiment of the present invention. Detailed Implementation

[0020] This utility model embodiment provides a fuse switch such as... Figure 1-5As shown, the device includes a base 1, a panel 2, and a protective assembly 3. The base 1 contains multiple sets of circuits. A toggle switch 21 for switching each circuit on and off is rotatably mounted on the panel 2. Each circuit includes a power path 41 and an electrical path 42, and the power path 41 and electrical path 42 are electrically connected only through the protective assembly 3. The protective assembly 3 includes a disassembly block 31 and a fuse 32 mounted on the disassembly block 31. The disassembly block 31 is detachably mounted on the base 1. The two ends of the fuse 32 are connected to the power path 41 and the electrical path 42 respectively, so that it melts and breaks the circuit when the current in the circuit is too high. The disassembly block 31 has a receiving groove 311 for accommodating the fuse 32. Limiting walls 312 are provided at both ends of the receiving groove 311 along the axial direction of the fuse 32, and the distance between the two limiting walls 312 forms an interference fit with the fuse 32. The receiving groove 311 has openings 313 and limiting arc blocks 314 at both ends of the fuse 32 radially. The fuse 32 is inserted into the receiving groove 311 through the opening 313. The limiting arc blocks 314 cooperate with the outer peripheral surface of the fuse 32. The limiting arc blocks 314 are symmetrically arranged on both sides of the center line of the receiving groove 311. The ends of the power passage 41 and the electrical passage 42 are formed with U-shaped snap-fit ​​blocks 6. The snap-fit ​​blocks 6 are made of conductive material. The two ends of the fuse 32 are respectively tightened and connected in the two snap-fit ​​blocks 6 to form an electrical connection. The spacing between the openings of the snap-fit ​​blocks 6 and their bottoms is gradually reduced. A snap-fit ​​plate 7 is also fixed between the base 1 and the panel 2. The snap-fit ​​plate 7 is provided with elastic snap-fit ​​blocks 71. The disassembly block 31 has a slot 315 corresponding to the snap-fit ​​blocks 71. The slot 315 is located above the receiving groove 311 (that is, the slot 315 is closer to the panel 2 than the receiving groove 311).

[0021] The working principle of this embodiment is as follows: During assembly, the fuse 32 is first inserted into the receiving groove 311 through the opening 313. The interference fit of the limiting wall 312 and the radial restriction of the limiting arc blocks 314 on both sides form a preliminary positioning to prevent the fuse 32 from moving during installation. Then, the disassembly block 31, together with the fuse 32, is inserted into the corresponding mounting position of the base 1, so that the two ends of the fuse 32 are tightened and clamped by the snap-fit ​​blocks 6 of the power passage 41 and the electrical passage 42, respectively, to achieve electrical connection and prevent the fuse from falling off. At the same time, the snap-fit ​​block 71 on the snap-fit ​​plate 7 elastically snaps into the snap-fit ​​groove 315, forming a secondary positioning for the disassembly block 31 to ensure that the protective component 3 will not fall off. When the dial 21 is turned to the on position, the current passes through the power passage 41, snap-fit ​​block 6, fuse 32, another snap-fit ​​block 6 and electrical passage 42 in sequence to form a conductive circuit. When an overload or short circuit occurs in the circuit, the large current will cause the fuse 32 to blow, thus achieving power-off protection. To replace it, simply insert the notch 22 on the panel 2 to pull out the disassembly block 31, remove the blown fuse 32, replace it with a new fuse, and then reinsert it into the base 1.

[0022] The above embodiments are merely one preferred embodiment of the present utility model. Ordinary changes and substitutions made by those skilled in the art within the scope of the present utility model's technical solution are all included within the protection scope of the present utility model.

Claims

1. A fuse switch, comprising a base, a panel, and a protective component, wherein the base has a plurality of circuits, the panel has a toggle switch for switching the plurality of circuits on and off, and the protective component has its two ends connected to a power circuit and an electrical circuit respectively, wherein the power circuit and the electrical circuit are electrically connected only through the protective component, and the protective component is used to disconnect the circuit when the current in the circuit is too large, characterized in that: The protective assembly includes a disassembly block and a fuse mounted on the disassembly block, with the two ends of the fuse connected to a power supply path and an electrical path, respectively; the disassembly block is detachably mounted on a base.

2. The fuse switch according to claim 1, characterized in that: The disassembly block is provided with a receiving groove for accommodating the fuse. Limiting walls are provided at both ends of the receiving groove along the axial direction of the fuse. The distance between the limiting walls on both sides of the receiving groove forms an interference fit with the fuse.

3. The fuse switch according to claim 2, characterized in that: The receiving groove is provided with an opening and a limiting arc block at both ends along the radial direction of the fuse. The fuse is inserted into the receiving groove through the opening. The limiting arc block cooperates with the outer peripheral surface of the fuse to prevent the fuse from moving toward the limiting arc block.

4. The fuse switch according to claim 3, characterized in that: The limiting arc blocks are symmetrically arranged on both sides of the center line of the receiving groove.

5. The fuse switch according to claim 1, characterized in that: Both the power supply path and the electrical path are equipped with U-shaped snap-fit ​​blocks. The snap-fit ​​blocks are made of conductive material and are respectively tightened and connected to both ends of the fuse to realize the electrical connection between the two snap-fit ​​blocks.

6. The fuse switch according to claim 5, characterized in that: The spacing between the snap-fit ​​blocks gradually decreases from the opening toward the bottom.

7. The fuse switch according to claim 1, characterized in that: A snap-fit ​​plate is provided between the base and the panel. The snap-fit ​​plate is provided with a flexible snap block. The disassembly block is provided with a slot corresponding to the snap block. The slot is located above the receiving slot.

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