Fuse

Abstract

The utility model relates to the technical field of electrical equipment, and discloses a fuse which comprises a shell, a fusible core arranged in the shell and a conducting strip electrically connected with the fusible core, a fixing groove used for containing the conducting strip and a wiring hole communicated with the fixing groove are formed in the shell, and a wire electrically connected with the conducting strip penetrates through the wiring hole. A fixing groove is formed in the shell, an elastic piece used for pressing a wire on the conducting strip in an abutting mode is arranged in the fixing groove, an unlocking hole communicated with the fixing groove is formed in the shell, an unlocking piece is movably arranged in the unlocking hole, and the unlocking piece is used for pushing the elastic piece to the side away from the wiring hole so that a gap which is formed by the elastic piece and the conducting strip and used for allowing the wire to stretch in can be enlarged. According to the fuse, the wire is fixed in the wiring hole through the elastic sheet, and the effect of improving the wiring convenience of the fuse is achieved.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and in particular to a fuse. Background Technology

[0002] A fuse is an electrical safety device mainly used for overload and short-circuit protection in circuits. Its basic working principle is to use the thermal effect of current to cut off abnormal or overload current in the circuit through the fusible element, thereby protecting electrical equipment from damage.

[0003] In related technologies, a fuse includes a housing, a fusible element disposed in the housing, and a conductive strip electrically connected to the fusible element. The housing has a fixing groove for accommodating the conductive strip and a wiring hole communicating with the fixing groove. The wiring hole is used to pass through a wire electrically connected to the conductive strip. The aforementioned wire is generally fixed by a bolt threaded into the wiring hole.

[0004] However, when wiring the aforementioned fuse, it is necessary to first loosen the bolts with a screwdriver or other tools, then insert the wires into the wiring holes, and finally tighten the bolts to fix the wires in the wiring holes. The operation is complicated and inconvenient for wiring, so it needs to be improved. Utility Model Content

[0005] To improve wiring ease, this application provides a fuse.

[0006] The fuse provided in this application adopts the following technical solution:

[0007] A fuse includes a housing, a fusible element disposed in the housing, and a conductive piece electrically connected to the fusible element. The housing has a fixing groove for accommodating the conductive piece and a wiring hole communicating with the fixing groove. The wiring hole is used to pass through a wire electrically connected to the conductive piece. The fixing groove has a spring piece for pressing the wire against the conductive piece. The housing has an unlocking hole communicating with the fixing groove. An unlocking member is movably disposed in the unlocking hole. The unlocking member is used to push the spring piece away from the wiring hole, thereby increasing the gap formed between the spring piece and the conductive piece for the wire to extend into.

[0008] By adopting the above technical solution, when wiring a fuse, simply insert the wire with the terminal block directly into the wiring hole, positioning the wire between the spring and the conductive plate. The spring will deform, generating elastic force that clamps the wire between the spring and the conductive plate, thus fixing the wire in the wiring hole. Compared to fixing the wire with bolts, this eliminates the need to loosen or tighten bolts each time wiring is done, simplifying the operation and improving the ease of fuse wiring.

[0009] When connecting wires without terminals, first press the unlocking mechanism towards the spring contact, increasing the gap between the spring and the conductive plate for the wire to enter the terminal hole. Then, insert the wire into the terminal hole and finally release the unlocking mechanism. The spring contact will press the wire against the conductive plate, thus securing the wire in the terminal hole. To remove the wire from the terminal hole, simply press the unlocking mechanism towards the spring contact, increasing the gap between the spring and the conductive plate, allowing the wire to be pulled out. This simple operation facilitates easy insertion and removal of wires.

[0010] Optionally, the spring includes a movable part, a fixed part, and a connecting part disposed between the movable part and the fixed part. The unlocking member abuts against the movable part. The movable part can abut the wire against the conductive sheet when the wire is inserted into the wiring hole. The fixed groove is provided with a rotating shaft. The connecting part is wound around the rotating shaft. The movable part and the fixed part have a tendency to move away from each other.

[0011] By adopting the above technical solution, when the wire is inserted into the wiring hole, the movable part will move along the rotating axis and undergo elastic deformation, thereby generating elastic force on the wire and pressing the wire against the conductive sheet. The structure is simple and the operation is convenient.

[0012] Optionally, the end of the movable part away from the connecting part is provided with a guide slope, and the guide slope is inclined along the direction in which the wire extends into the wiring hole.

[0013] By adopting the above technical solution, when the wire is inserted into the wiring hole, the wire will extend into the wiring hole along the guide slope. When the wire is pressed against the conductive plate by the movable part, the guide slope increases the contact area between the wire and the movable part, thereby making the movable part have a good limiting effect on the wire, and thus the electrical connection effect between the wire and the conductive plate is good.

[0014] Optionally, a partition plate is provided on the rotating shaft, the partition plate is disposed between the fixed part and the movable part, and the partition plate is located on the moving path of the movable part.

[0015] By adopting the above technical solution, when the movable part moves towards the side closer to the fixed part, the partition plate can limit the maximum movement distance of the movable part, reduce the possibility of the spring reducing its elasticity due to excessive deformation, make the spring have a good limiting effect on the wire, and extend the service life of the spring.

[0016] Optionally, the rotating shaft is provided with a protrusion located between the connecting part and the rotating shaft. When the movable part deforms, the connecting part will abut against the protrusion.

[0017] By adopting the above technical solution, when the spring moves along the rotating shaft, it generates friction with the shaft. The protrusion reduces the contact area between the spring and the shaft, thereby reducing the friction and making the spring move more smoothly. Furthermore, the protrusion increases the distance between the spring and the shaft, increasing the spring's range of motion. This allows for greater deformation of the spring, resulting in increased elastic force and allowing it to better utilize its elasticity. The spring also provides good control over the conductor.

[0018] Optionally, the wall of the unlocking hole is provided with a mounting block, and the side wall of the unlocking component is provided with a mounting groove. The mounting block and the mounting groove are slidably engaged, and the side of the mounting groove near the movable part is closed.

[0019] By adopting the above technical solution, when the unlocking component is released, the moving part will press the unlocking component towards the outside of the housing, and the groove wall of the mounting groove will abut against the side wall of the mounting block, thereby limiting the unlocking component in the unlocking hole, making it difficult for the unlocking component to move out of the unlocking hole and difficult to lose, thus improving the overall integrity of the fuse.

[0020] Optionally, the unlocking component includes a mounting part and a limiting part disposed on one side of the mounting part, and a stop is provided on the wall of the unlocking hole, the stop being located on the side of the limiting part closer to the movable part.

[0021] By adopting the above technical solution, when the unlocking part is pressed, the stop block can prevent the unlocking part from completely entering the fixed groove, thus limiting the sliding distance of the unlocking part and limiting the deformation of the moving part, so as not to lose elasticity due to excessive deformation, thereby extending the service life of the spring.

[0022] Optionally, a test resistor is provided inside the housing. One end of the test resistor is electrically connected to an indicator light, and the other end is electrically connected to a first conductive element. The indicator light is electrically connected to a second conductive element. The first conductive element is electrically connected to one end of the molten core, and the second conductive element is electrically connected to the other end of the molten core. The housing is provided with a light-transmitting part corresponding to the position of the indicator light.

[0023] By adopting the above technical solution, when the fuse element of the fuse blows, the current no longer passes through the fuse element, but flows into the indicator light and test resistor along the first conductive element, and flows out along the second conductive element. At this time, the indicator light will change from dark to bright, indicating to the staff that the fuse element has blown and needs to be replaced with a new fuse element, without having to open the fuse casing to check whether the fuse element has blown. This makes it easier for staff to observe the working status of the fuse and the fault condition of the circuit.

[0024] Optionally, the light-transmitting part has an observation hole, and a transparent plate is provided in the observation hole. The indicator light is located on the side of the transparent plate near the molten core.

[0025] By adopting the above technical solution, when the indicator light changes from dim to bright, the light from the indicator light penetrates the transparent plate, allowing staff to observe whether the fuse core has melted from the outside of the fuse, facilitating observation. Furthermore, the transparent plate ensures good sealing of the casing, thus improving the fuse's moisture resistance.

[0026] Optionally, a fixing ring is provided on the inner side wall of the housing, and the pin of the indicator light is disposed in the fixing ring. The fixing ring is provided with a through hole for the first conductive element or the second conductive element to pass through.

[0027] By adopting the above technical solution, the indicator light pin is fixed in the fixing ring. Compared with the exposed setting of the indicator light pin, the fixing ring can protect the indicator light pin from deformation and damage, thereby fixing the position of the indicator light and extending the service life of the indicator light.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. The wire is pressed against the conductive plate by a spring clip, thereby fixing the wire in the wiring hole without tightening or loosening the bolt, making wiring simple;

[0030] 2. When it is necessary to remove the wire, simply push the unlocking piece towards the moving part to facilitate removing the wire;

[0031] 3. The indicator light can accurately show the working status of the fuse without opening the fuse housing, which is convenient and quick. Attached Figure Description

[0032] Figure 1 This is an overall structural diagram of an embodiment of this application.

[0033] Figure 2 This is a schematic diagram of the structure after the shell portion is hidden in an embodiment of this application.

[0034] Figure 3 This is a partial structural diagram of the unlocking mechanism shown after the shell portion is hidden in an embodiment of this application.

[0035] Figure 4 This is a partial structural diagram of the protrusions displayed after the shell portion is hidden in an embodiment of this application.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Housing; 11. Light-transmitting part; 12. Transparent plate; 13. Fixing ring; 131. Through hole; 14. Observation hole; 2. Fusible core; 21. First conductive element; 22. Second conductive element; 23. Test resistor; 24. Indicator light; 3. Conductive sheet; 4. Wiring hole; 41. Fixing groove; 5. Spring; 51. Fixing part; 52. Connecting part; 53. Movable part; 531. Guide slope; 6. Rotating shaft; 61. Divider plate; 62. Protrusion; 7. Limiting block; 8. Unlocking hole; 81. Mounting block; 82. Stop block; 9. Unlocking element; 92. Pressing groove; 93. Mounting groove; 94. Mounting part; 95. Sliding part; 96. Limiting part. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0039] This application discloses a fuse.

[0040] Reference Figure 1 and Figure 2 A fuse includes a housing 1, a fuse core 2 disposed in the housing 1, and a conductive sheet 3 electrically connected to the fuse core 2. The housing 1 has a fixing groove 41 for accommodating the conductive sheet 3 and a wiring hole 4 communicating with the fixing groove 41. The wiring hole 4 is used to pass through a wire electrically connected to the conductive sheet 3. The fixing groove 41 is provided with a spring piece 5 for pressing the wire against the conductive sheet 3.

[0041] Reference Figure 1 and Figure 2 The spring 5 is elastic and includes a fixed part 51, a movable part 53, and a connecting part 52 disposed between the movable part 53 and the fixed part 51. A rotating shaft 6 is provided in the fixed groove 41, and the connecting part 52 is wound around the rotating shaft 6. The movable part 53 can deform along the rotating shaft 6, and the fixed part 51 and the movable part 53 have a tendency to move away from each other. A guide slope 531 is provided at the end of the movable part 53 away from the connecting part 52. The guide slope 531 is inclined along the direction in which the wire extends into the wiring hole 4, and the guide slope 531 can guide the wiring terminal into the fixed groove 41.

[0042] Reference Figure 1 and Figure 2 A limiting block 7 is provided in the fixing groove 41, which can limit the fixing part 51. When the movable part 53 is deformed by pressure, the limiting block 7 abuts against the side of the fixing part 51 away from the movable part 53. The housing 1 is provided with an unlocking member 9 for limiting the movable part 53. Alternatively, the fixing part 51 can be directly fixed in the fixing groove 41 so that the fixing part 51 is not easy to move along the rotation axis 6.

[0043] Reference Figure 1 and Figure 2With the above configuration, when a wire needs to be connected to the fuse, simply insert the terminal at the end of the wire into the wiring hole 4, so that the movable part 53 abuts the wire against the conductive piece 3, thus achieving an electrical connection between the wire and the fuse. The operation is simple. The guide slope 531 facilitates the insertion of the wire into the wiring hole 4 and makes the connection more secure after the wire is in place.

[0044] Reference Figure 2 and Figure 3 The housing 1 comprises two detachably connected parts. This detachable connection can be achieved through snap-fit ​​or bolt connection; any method that allows for detachment is acceptable. A spring piece 5 is fitted onto the rotating shaft 6. The fixed part 51 is limited by the limiting block 7, and the movable part 53 is limited by the unlocking part 9, ensuring that the spring piece 5 will not rotate relative to the housing 1 when not subjected to external force. If the spring piece 5 fails after prolonged use, it can be removed from the other part of the housing 1 and replaced after removing a portion of the housing 1.

[0045] Reference Figure 1 and Figure 2 The housing 1 has a light-transmitting part 11 with an observation hole 14. A transparent plate 12 is fixed to the observation hole 14. A fixing ring 13 is also fixed to the inner wall of the housing 1. The fixing ring 13 has a through hole 131 for wiring. In this embodiment, the number of through holes 131 is preferably two. One end of the fused core 2 is connected to a first conductive element 21, and the other end is connected to a second conductive element 22. In this embodiment, both the first conductive element 21 and the second conductive element 22 are preferably wires. In other cases, other conductive elements such as metal sheets can be selected according to customer needs.

[0046] Reference Figure 1 and Figure 2 A test resistor 23 is electrically connected to the first conductive element 21, and an indicator light 24 is electrically connected to the test resistor 23. The indicator light 24 is electrically connected to the second conductive element 22. The indicator light 24 is located on the side of the transparent plate 12 near the fuse 2, and the pin of the indicator light 24 is located in the fixing ring 13. The second conductive element 22 extends into the through hole 131 and is electrically connected to the pin of the indicator light 24. With the above settings, when the fuse 2 melts, the indicator light 24 will change from dark to bright, thereby indicating to the operator that the fuse 2 has melted and needs to be replaced with a new fuse 2, facilitating the observation of the working status of the fuse 2.

[0047] Reference Figure 2 and Figure 3The housing 1 has an unlocking hole 8 communicating with the fixing groove 41. An unlocking member 9 is slidably disposed in the unlocking hole 8, abutting against the side of the movable part 53 away from the fixing part 51. The unlocking member 9 can push the spring piece 5 away from the wiring hole 4. The unlocking member 9 includes a mounting part 94, a sliding part 95 abutting against the movable part 53, and a limiting part 96 disposed on one side of the mounting part 94. A pressing groove 92 is provided on the side wall of the unlocking member 9 away from the movable part 53 for easy pressing of the unlocking member 9. A mounting block 81 is provided on the hole wall of the unlocking hole 8. A mounting groove 93 is provided on the mounting part 94 that slidably engages with the mounting block 81. The side of the mounting groove 93 near the movable part 53 is closed.

[0048] Reference Figure 4 A partition plate 61 is fixed on the rotating shaft 6 between the fixed part 51 and the movable part 53. The partition plate 61 is located on the moving path of the movable part 53 and is fixedly connected in the fixed groove 41. A protrusion 62 is provided on the rotating shaft 6. The protrusion 62 is located between the connecting part 52 and the rotating shaft 6. When the movable part 53 deforms, the connecting part 52 will abut against the protrusion 62. The cross-section of the protrusion 62 is preferably semi-circular, so that the movable part 53 can move along the arc surface of the protrusion 62, and the movement process is smoother.

[0049] Reference Figure 4 Through the above-mentioned arrangement, the partition plate 61 can limit the maximum deformation of the movable part 53, making the spring piece 5 less likely to lose its elasticity due to excessive deformation. The protrusion 62 leaves a gap between the spring piece 5 and the rotating shaft 6, increasing the movement space of the spring piece 5, allowing the spring piece 5 to release greater elastic force, thereby improving the clamping effect of the spring piece 5 on the wire.

[0050] The implementation principle of a fuse according to an embodiment of this application is as follows: When wiring the fuse is required, simply insert the wire with the terminal block 4 into the wiring hole 4, so that the wire is clamped between the movable part 53 and the conductive piece 3. Alternatively, the unlocking member 9 can be pressed first, and then the wire can be inserted into the fixing groove 41 for easy connection of wires without terminals. When it is necessary to pull the wire out of the wiring hole 4, simply press the unlocking member 9 towards the movable part 53, so that the gap formed between the movable part 53 and the conductive piece 3 for the wire to enter the fixing groove 41 is increased, and then the wire can be pulled out of the wiring hole 4. This eliminates the need to tighten or loosen the bolts every time a wire is connected or disconnected, making the operation simple and convenient for inserting and removing wires.

[0051] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fuse comprising a housing (1), a fuse core (2) arranged in the housing (1), a conducting sheet (3) electrically connected with the fuse core (2), a fixing groove (41) for accommodating the conducting sheet (3) being formed on the housing (1), and a wire hole (4) communicating with the fixing groove (41), the wire hole (4) being used for threading a wire electrically connected with the conducting sheet (3), characterized in that: The fixed groove (41) is provided with a spring (5) for pressing the wire against the conductive sheet (3), the shell (1) is provided with an unlocking hole (8) communicated with the fixed groove (41), the unlocking hole (8) is movably provided with an unlocking piece (9), the unlocking piece (9) is used for pushing the spring (5) to the side away from the wiring hole (4), so that the gap formed by the spring (5) and the conductive sheet (3) for the wire to extend into is increased. ​ 2. A fuse according to claim 1, characterized in that: The spring (5) comprises a movable part (53), a fixed part (51) and a connecting part (52) arranged between the movable part (53) and the fixed part (51), the unlocking piece (9) abuts against the movable part (53), the movable part (53) can abut against the wire on the conductive sheet (3) when the wire extends into the wiring hole (4), the fixed groove (41) is provided with a rotating shaft (6), the connecting part (52) is arranged around the rotating shaft (6), the movable part (53) and the fixed part (51) have a tendency to move away from each other.

3. A fuse according to claim 2, wherein: The end of the movable part (53) away from the connecting part (52) is provided with a guide inclined surface (531), the guide inclined surface (531) is inclined in the direction of the wire extending into the wiring hole (4).

4. A fuse according to claim 2, wherein: The rotating shaft (6) is provided with a partition plate (61), the partition plate (61) is arranged between the fixed part (51) and the movable part (53), and the partition plate (61) is located on the moving path of the movable part (53).

5. A fuse according to claim 2, wherein: The rotating shaft (6) is provided with a protrusion (62), the protrusion (62) is located between the connecting part (52) and the rotating shaft (6), when the movable part (53) deforms, the connecting part (52) abuts against the protrusion (62).

6. A fuse according to claim 2, wherein: The hole wall of the unlocking hole (8) is provided with a mounting block (81), the side wall of the unlocking piece (9) is provided with a mounting groove (93), the mounting block (81) and the mounting groove (93) are in sliding fit, and the side of the mounting groove (93) close to the movable part (53) is designed in a closed manner.

7. A fuse according to claim 6, characterised in that: The unlocking piece (9) comprises a mounting part (94) and a limiting part (96) arranged on one side of the mounting part (94), the hole wall of the unlocking hole (8) is provided with a stop block (82), and the stop block (82) is located on the side of the limiting part (96) close to the movable part (53).

8. The fuse of claim 1, wherein: The inside of the shell (1) is provided with a test resistance (23), one end of the test resistance (23) is electrically connected with an indicating lamp (24), the other end of the test resistance (23) is electrically connected with a first conductive piece (21), the indicating lamp (24) is electrically connected with a second conductive piece (22), the first conductive piece (21) is electrically connected at one end of the fuse core (2), and the second conductive piece (22) is electrically connected at the other end of the fuse core (2), and the shell (1) is provided with a light transmission part (11) corresponding to the position of the indicating lamp (24).

9. A fuse according to claim 8, characterised in that: The light transmission part (11) is provided with an observation hole (14), the observation hole (14) is provided with a transparent plate (12), and the indicating lamp (24) is located on the side of the transparent plate (12) close to the fuse core (2).

10. A fuse according to claim 8, wherein: The inner side wall of the shell (1) is provided with a fixing ring (13), the pin of the indicating lamp (24) is arranged in the fixing ring (13), and the fixing ring (13) is provided with a through hole (131) for penetrating the first conductive piece (21) or the second conductive piece (22).

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