An excitation fuse

Abstract

An excitation fuse includes an upper housing, a lower housing, a gas generating device, a piston, and a conductor. The piston has an upwardly recessed bottom forming a through-type central groove, with a pin formed on each side of the groove. The lower housing has a centrally extending wall in its lower chamber, with guide grooves formed on each side below the pins. A fusible link rests on the central wall, but does not block the lower or upper chambers. The bottom of the piston overlaps the fusible link, and the pins of the piston extend beyond the fusible link and are inserted downwards into the corresponding guide grooves, and / or the top of the central wall extends beyond the fusible link and is inserted upwards into the central groove. When the gas generating device receives an excitation signal, it generates and releases high-pressure gas, which drives the piston. Because the piston is pre-guided and positioned with the lower housing, it can move smoothly downwards without deviation or jamming, ensuring that the piston's movement effectively cuts off the conductor.

Description

Technical Field

[0001] This utility model relates to the technical field of fuses, and in particular to an excitation fuse. Background Technology

[0002] An activated fuse is a protective device that quickly disconnects a circuit. An activated fuse generally includes an upper housing, a lower housing, a gas generator, a piston, and a conductor. The upper housing has a cavity containing the gas generator, piston, and conductor, which can be connected to an external circuit requiring protection. The gas generator receives an activation signal, generates and releases high-pressure gas, which drives the piston to move, cutting off the conductor and thus disconnecting the circuit.

[0003] However, the piston may experience unstable movement direction during operation, which may cause the piston to get stuck in the inner cavity of the housing, resulting in insufficient piston stroke; or it may cause the piston to be misaligned with the pre-break point of the conductor, resulting in the conductor breaking effect not meeting expectations.

[0004] Therefore, a small excitation fuse is disclosed in Chinese Patent Publication No. CN 112863968 B. In this solution, a guide structure is provided in the piston to assist in guiding displacement. The guide structure is to add guide ridges on both sides of the piston and guide grooves on the shell. Although the guide structure in this solution can play a certain guiding role, this guide structure will first reduce the structural strength of the "groove square". Secondly, this structure is not suitable for pistons that already have other structures on both sides of the piston and there is no space to make this guide structure, as well as pistons that are too far away from the inner wall of the lower cavity during operation. Utility Model Content

[0005] The purpose of this invention is to provide an excitation fuse that has the advantage of improving the stability of the piston movement process.

[0006] To achieve the above objectives, the solution of this utility model is: An actuated fuse includes an upper housing, a lower housing, a gas generating device, a piston, and a conductor; the upper housing and the lower housing are arranged vertically; the upper housing has an upper chamber with a bottom opening, and the gas generating device is located at the top of the upper chamber; the piston is slidably mounted in the upper chamber and located below the gas generating device; the lower housing has a lower chamber with a top opening; the conductor is sandwiched between the upper housing and the lower housing, and the conductor has a fusible portion located between the upper chamber and the lower chamber; The piston has an upward-recessed bottom forming a through-hole, with a pin on each side of the through-hole; the lower chamber of the lower housing has a central wall extending forward and backward, with a guide groove on each side of the central wall located below the pin. The fusible link is mounted on the middle wall, and the fusible link does not block the lower chamber and the upper chamber; the bottom of the piston is attached to the fusible link, and the piston pin extends beyond the fusible link and is inserted downward into the corresponding guide groove and / or the top part of the middle wall extends beyond the fusible link and is inserted upward into the middle groove.

[0007] Furthermore, the fusion break is located in the middle of the central wall, and the front-to-back width of the fusion break is smaller than the front-to-back length of the central wall.

[0008] Furthermore, the front and rear ends of the two pins at the bottom of the piston in the upper chamber are respectively formed into small pins that protrude downwards. These small pins pass over the fuse section and are inserted into the guide groove in the lower chamber. The distance between the two small pins is equal to or greater than the front and rear width of the fuse section.

[0009] Furthermore, the middle wall forms upward protruding bosses on the front and rear sides of the fused portion, and the bosses extend upward past the fused portion and insert into the middle groove of the piston in the upper chamber.

[0010] Furthermore, the boss is recessed with a slot, and the front and rear sides of the fused part are provided with positioning blocks for engaging in the slot for positioning; the bottom surface of the piston's central groove is provided with a locking block, which can be aligned and engaged with the slot after the piston moves down to the end point.

[0011] Furthermore, the width of the central groove allows for a tight fit when the central wall is inserted.

[0012] Furthermore, the left and right ends of the fuse part are provided with connecting parts that can extend out of the left and right sides of the upper and lower housings; the top surface of the fuse part is provided with a concave-convex structure, and the bottom surface of the corresponding pin is provided with a recessed structure that matches the concave-convex structure.

[0013] Furthermore, the piston top surface is recessed with a groove for accommodating the bottom of the gas generating device, and a gap is formed between the groove and the gas generating device.

[0014] Furthermore, the groove is a frustum-shaped groove that is narrow at the bottom and wide at the top, and an arc-shaped protrusion is formed in the middle of the bottom surface of the groove.

[0015] Furthermore, the piston sidewall is provided with an annular sealing groove, and a sealing ring is fitted inside the annular sealing groove to form a sealing fit with the upper chamber sidewall.

[0016] After adopting the above technical solution, when the gas generating device receives an excitation signal, it generates and releases high-pressure gas, which can drive the piston to move. Since the piston has been pre-guided and positioned with the lower housing, when the piston moves downward, the pin can move accurately along the guide groove, or the middle groove of the piston can move downward along the middle wall. Regardless of whether the pin or the middle wall is used, both are guided and cooperated with the guide groove and the middle groove respectively, so that the piston can move downward smoothly without deviation or jamming, ensuring that the movement of the piston can effectively cut off the conductor and disconnect the circuit. Attached Figure Description

[0017] Figure 1 This is a perspective view of an embodiment of the present utility model; Figure 2 This is an exploded view of an embodiment of the present utility model; Figure 3 This is a cross-sectional view of an embodiment of the present utility model; Figure 4 This is a perspective view of the piston according to an embodiment of the present utility model; Figure 5 This is a side view of the piston according to an embodiment of the present invention; Figure 6 This is a bottom view of the piston according to an embodiment of the present invention; Figure 7 This is a perspective view of the lower housing according to an embodiment of the present utility model.

[0018] Labeling: Upper shell 1, Upper chamber 11, Lower shell 2, Lower chamber 21, Middle wall 22, Boss 221, Slot 222, Guide groove 23, Arc extinguishing material 231, Gas generating device 3, Piston 4, Middle groove 41, Locking block 411, Pin 42, Small pin 421, Recessed structure 422, Groove 43, Arc-shaped protrusion 431, Annular sealing groove 44, Sealing ring 45, Conductor 5, Fusible part 51, Positioning block 511, Concave-convex structure 512, Connecting part 52. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] like Figures 1 to 7 As shown, an excitation fuse of this embodiment includes an upper housing 1, a lower housing 2, a gas generating device 3, a piston 4, and a conductor 5.

[0021] like Figure 2 and Figure 3 As shown, the upper housing 1 and the lower housing 2 are arranged vertically and can be fixed by screws; the upper housing 1 has an upper chamber 11 with a bottom opening, and a gas generating device 3 is provided on the top of the upper chamber 11. The piston 4 is slidably installed in the upper chamber 11 and located below the gas generating device 3. The bottom of the piston 4 is recessed upward to form a through groove 41, and a pin 42 is formed on the left and right sides of the groove 41.

[0022] The lower housing 2 has a lower chamber 21 with a top opening. A middle wall 22 extending from front to back is formed in the middle of the lower chamber 21. A guide groove 23 located below the pin 42 is formed on the left and right sides of the middle wall 22, respectively.

[0023] The conductor 5 is sandwiched between the upper housing 1 and the lower housing 2, and the conductor 5 has a fuse portion 51 located between the upper chamber 11 and the lower chamber 21. The left and right ends of the fuse portion 51 may be provided with connecting portions 52 that can extend out of the left and right sides of the upper housing 1 and the lower housing 2. The connecting portions 52 are used to connect with external circuits that need protection.

[0024] The fusible part 51 is mounted on the middle wall 22, and the fusible part 51 does not block the lower chamber 21 and the upper chamber 11.

[0025] The bottom of the piston 4 overlaps with the fuse part 51, and the pin 42 of the piston 4 passes over the fuse part 51 and is inserted downward into the corresponding guide groove 23 and / or the top part of the middle wall 22 passes over the fuse part 51 and is inserted upward into the middle groove 41 to form a guiding position.

[0026] Therefore, when the gas generating device 3 receives an excitation signal, it generates and releases high-pressure gas, which drives the piston 4 to move. Since the piston 4 has been guided and positioned with the lower housing 2, when the piston 4 moves downward, the pin 42 can move accurately along the guide groove 23, or the middle groove 41 of the piston 4 can move downward along the middle wall 22. Whether using the pin 42 or the middle wall 22, both are guided and cooperated with the guide groove 23 and the middle groove 41 respectively, so that the piston 4 can move downward smoothly without deviation or jamming, ensuring that the movement of the piston 4 can effectively cut off the conductor 5 and thus disconnect the circuit.

[0027] In this embodiment, the upper shell 1, the lower shell 2, and the piston 4 are made of insulating plastic material, and the conductor 5 is made of conductive material.

[0028] In this embodiment, the fuse section 51 is mounted on the middle of the middle wall 22. The front-to-back width of the fuse section 51 is smaller than the front-to-back length of the middle wall 22, so that the upper chamber 11 and the lower chamber 21 on the front and back sides of the fuse section 51 are connected to each other. At the same time, the front and back ends of the two pins 42 at the bottom of the piston 4 in the upper chamber 11 respectively form small pins 421 that protrude downwards. The small pins 421 pass over the fuse section 51 and are inserted into the guide groove 23 in the lower chamber 21, thereby achieving guidance and positioning. The middle wall 22 forms bosses 221 that protrude upwards on the front and back sides of the fuse section 51 respectively. The bosses 221 pass over the fuse section 51 and are inserted into the middle groove 41 of the piston 4 in the upper chamber 11, which can also achieve guidance and positioning.

[0029] In this embodiment, small pins 421 and bosses 221 are preferably provided at the same time. Of course, only one of the guide structures can be provided. For example, when the depth of the guide groove 23 in the lower chamber 21 is limited, small pins 421 can be omitted and only bosses 221 can be provided.

[0030] See Figure 5 In this embodiment, the boss 221 may be recessed with a slot 222, and the front and rear sides of the fuse part 51 may be provided with positioning blocks 511 for locking into the slot 222 for positioning. The bottom surface of the middle groove 41 of the piston 4 may also be provided with a locking block 411. After the piston 4 moves down to the end point, the locking block 411 can be aligned and engaged with the slot 222.

[0031] The left-right distance between the two pins 42 of the piston 4, that is, the width of the middle groove 41, can be equal to or slightly greater than the width of the middle wall 22, so as to facilitate alignment and insertion into the guide groove 23.

[0032] Furthermore, the width of the central groove 41 can be slightly smaller than the width of the central wall 22, so that the two can achieve a tight fit when the central wall 22 is inserted into the central groove 41. Therefore, the smaller width of the central groove 41 has the following advantages: 1. The closer the fit between the device and the middle wall 22, the better the guiding effect. 2. It can position piston 4 after it has moved to its final position, preventing piston 4 from rebounding; 3. Increased friction with the middle wall 22 can lengthen the time it takes for the piston 4 to reach its final position, which can achieve a delayed cutting effect in a structure with a cutting plate below the piston 4 (refer to existing technology).

[0033] In this embodiment, the distance between the two small pins 421 before and after the pin 42 can be slightly greater than the front and rear width of the fuse part 51, so as to facilitate the small pins 421 to be pre-inserted into the guide groove 23 for guiding and positioning.

[0034] Of course, the spacing between the two small pins 421 can also be equal to the front and rear width of the fuse part 51. Setting a smaller spacing between the two small pins 421 can improve the guiding effect. Specifically, the spacing between the small pins 421 and the front and rear of the fuse part 51 can be selected according to the actual guiding requirements.

[0035] See Figure 4 and Figure 7 In this embodiment, the top surface of the fuse part 51 may be provided with a concave-convex structure 512, and the bottom surface of the pin 42 between the two small pins 421 may be provided with a recessed structure 422 that matches the concave-convex structure 512. This can facilitate the positioning and cooperation of the piston 4 with the fuse part 51 during assembly, and can accurately assist in cutting off the fuse part 51 when the piston 4 moves down.

[0036] In this embodiment, the bottom of the guide groove 23 may be provided with an arc-extinguishing material 231 so that the piston 4 can quickly extinguish the arc after moving down to cut off the fused part 51.

[0037] like Figure 3 In this embodiment, the top surface of the piston 4 is recessed with a groove 43 for accommodating the bottom of the gas generating device 3. A gap is formed between the groove 43 and the gas generating device 3. This allows the gas generated by the gas generating device 3 to be concentrated in the groove 43, thereby concentrating the force and increasing the pressure on the piston 4, enabling the piston 4 to effectively break through the fused part 51. Furthermore, since the piston 4 utilizes the groove 43 to partially enclose the gas generating device 3, the overall height of the piston 4 will increase accordingly, which can effectively reduce the swing angle of the piston 4 during its downward movement and prevent the piston 4 from deviating during its downward movement.

[0038] Furthermore, in this embodiment, the groove 43 can be a frustoconical groove 43 that is narrow at the bottom and wide at the top, and an arc-shaped protrusion 431 is formed in the middle of the bottom surface of the groove 43, so that the cross-section of the groove 43 can be "W" shaped. The "W" shaped groove 43 can make the force of the gas released by the gas generating device 3 on the piston 4 more concentrated, while also dispersing the pressure of the high-pressure gas on the bottom surface of the "groove 43". The added arc-shaped protrusion 431 increases the thickness between the bottom surface of the groove 41 of the piston 4 and the bottom surface of the "groove 43", improving the structural strength of the piston 4 and making the bottom surface of the "groove 43" of the piston 4 less prone to breakage, ensuring that the piston 4 can move down stably and reliably to break the fuse part 51.

[0039] Meanwhile, in this embodiment, the sidewall of piston 4 and the sidewall of upper chamber 11 can be sealed together to prevent high-pressure gas leakage and further prevent piston 4 from shifting downwards. Specifically, one or two annular sealing grooves 44 can be recessed on the upper sidewall of piston 4, and an O-ring seal 45 is fitted inside the annular sealing groove 44.

[0040] In summary, in this embodiment, by providing a central groove 41 and two spaced pins 42 on the piston 4, and a central wall 22 and two grooves 43 on the lower housing 2, the cooperation of the two pins 42 and grooves 43, as well as the pre-cooperation of the central groove 41 and central wall 22, can achieve a stable and reliable downward movement of the piston 4, preventing the piston 4 from deviating or jamming during movement and ensuring effective breaking of the conductor 5. Furthermore, the pins 42 and central wall 22 in this embodiment have a simple structure, high strength, and are relatively reliable and durable.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected by this utility model. It should be noted that for those skilled in the art, equivalent changes and modifications without departing from the principle of this utility model should still fall within the protection scope of this utility model.

[0042] In the description of the embodiments of this application, it should be understood that the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships commonly used when the product is in use, or the orientations or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. In the description of this application, "a plurality of" and "several" mean two or more, unless otherwise explicitly specified.

Claims

1. An actuated fuse, comprising an upper housing, a lower housing, a gas generating device, a piston, and a conductor; the upper housing and the lower housing are arranged vertically; the upper housing has an upper chamber with a bottom opening, the gas generating device is disposed at the top of the upper chamber, and the piston is slidably mounted in the upper chamber and located below the gas generating device; the lower housing has a lower chamber with a top opening; the conductor is sandwiched between the upper housing and the lower housing, and the conductor has a fusible portion located between the upper chamber and the lower chamber; characterized in that: The piston has an upward-recessed bottom forming a through-hole, with a pin on each side of the through-hole; the lower chamber of the lower housing has a central wall extending forward and backward, with a guide groove on each side of the central wall located below the pin. The fusible link is mounted on the middle wall, and the fusible link does not block the lower chamber and the upper chamber; the bottom of the piston is attached to the fusible link, and the piston pin extends beyond the fusible link and is inserted downward into the corresponding guide groove and / or the top part of the middle wall extends beyond the fusible link and is inserted upward into the middle groove.

2. The excitation fuse according to claim 1, characterized in that: The fusion section is located in the middle of the central wall, and the front-to-back width of the fusion section is smaller than the front-to-back length of the central wall.

3. The excitation fuse according to claim 2, characterized in that: The front and rear ends of the two pins at the bottom of the piston in the upper chamber form small pins that protrude downwards. These small pins pass over the fuse section and are inserted into the guide groove in the lower chamber. The distance between the two small pins is equal to or greater than the front and rear width of the fuse section.

4. An excitation fuse according to claim 2, characterized in that: The middle wall forms upward protruding bosses on the front and rear sides of the fused section, and the bosses extend upward past the fused section and insert into the middle groove of the piston in the upper chamber.

5. An excitation fuse according to claim 4, characterized in that: The boss has a recessed groove, and the front and rear sides of the fuse part are provided with positioning blocks for locking into the groove for positioning; the bottom surface of the piston's middle groove is provided with a locking block, which can be aligned and engaged with the groove after the piston moves down to the end point.

6. The excitation fuse according to claim 1, characterized in that: The width of the central groove is designed to allow for a tight fit when the central wall is inserted.

7. An excitation fuse according to claim 1, characterized in that: The fuse part has connecting parts at both ends that can extend to the left and right sides of the upper and lower housings; the top surface of the fuse part has a concave-convex structure, and the bottom surface of the corresponding pin has a recessed structure that matches the concave-convex structure.

8. An excitation fuse according to claim 1, characterized in that: The piston top surface is recessed with a groove for accommodating the bottom of the gas generator, and a gap is formed between the groove and the gas generator.

9. An excitation fuse according to claim 8, characterized in that: The groove is a frustum-shaped groove that is narrow at the bottom and wide at the top, and an arc-shaped protrusion is formed in the middle of the bottom surface of the groove.

10. An excitation fuse according to any one of claims 1, 8, or 9, characterized in that: The piston sidewall is provided with an annular sealing groove, and a sealing ring is fitted inside the annular sealing groove to seal against the sidewall of the upper chamber.

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