Fuse with protection device

Abstract

The utility model relates to fuse technology field, concretely is a kind of fuse with protection device, including lower shell, the top of lower shell is detachably connected with upper shell, the end of lower shell is detachably installed with contact, the inside one side of contact near lower shell is provided with fuse link, protection assembly is arranged between lower shell and upper shell. This fuse can directly extract the fuse link protected in protective sleeve at the gap between upper shell and lower shell, without completely pouring out quartz sand in inner cavity, and the several inclined holes arranged on the side of protective sleeve, so that part of quartz sand will also enter into protective cavity and contact with fuse link when inserting into inner cavity, avoid that fuse link generates spark, affect the use safety of fuse, and the plugboard and closure plate arranged on side make the whole fuse more convenient and efficient when replacing maintenance.

Description

Technical Field

[0001] This utility model relates to the field of fuse technology, specifically a fuse with a protective device. Background Technology

[0002] A fuse is a structure that cuts off power by melting the fuse at high temperature when the current exceeds a threshold. This structure can prevent high-voltage current from damaging the device. The existing knife-shaped structure can adopt a knife-shaped end structure, which makes it easy to insert directly into the inside of the circuit device, reducing the time spent. At the same time, the existing structure has a protective structure on the outside and quartz sand inside the protective structure, which can play a good role in extinguishing the arc.

[0003] According to a public notice (No.: CN222883473U) of a knife-type contact fuse with a protective device, the above application utilizes a combined end cap to achieve a sealing effect when combined with a protective shell. The insulating sleeve and limiting slide can be spliced ​​with the outer left and right positioning plates. During the splicing process, the splicing is carried out along the positioning slide groove of the combined end cap, keeping the insulating sleeve fixed in the fixed position of the combined end cap. When disassembly is required, the left and right positioning plates can be directly separated by the threaded rod to remove the knife-type contact from the inside of the combined end cap, facilitating flexible disassembly and replacement.

[0004] However, when replacing the internal fuse element in the aforementioned device, the entire outer casing still needs to be opened and the quartz sand poured out. This necessitates the use of additional containers to hold the quartz sand during fuse replacement, and other impurities can easily be introduced during the pouring process, reducing the safety of the fuse in subsequent use. Therefore, we propose a fuse with a protective device. Utility Model Content

[0005] The purpose of this invention is to provide a fuse with a protective device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a fuse with a protective device, comprising a lower housing, an upper housing detachably connected to the top of the lower housing, a contact detachably mounted at the end of the lower housing, a fusible element disposed on the inner side of the contact near the lower housing, a protective assembly disposed between the lower housing and the upper housing, the protective assembly comprising a mating groove formed on the inner wall of the end of the lower housing, a closed groove formed on the side of the lower housing, an I-beam connecting block detachably mounted inside the mating groove, a protective sleeve fixedly mounted on the side of the I-beam connecting block near the inner wall of the lower housing, V-belts fixedly mounted at the upper and lower ends of the protective sleeve, a protective cavity formed inside the protective sleeve, and oblique holes formed on the side wall of the protective sleeve.

[0007] Preferably, an insert plate is slidably installed inside the docking groove, a sealing plate is fixedly installed on the side of the insert plate away from the center of the lower housing, a bolt is rotatably installed inside the insert plate, a protruding strip is fixedly installed on the side wall of the insert plate, and sealing strips are fixedly installed on the outer walls of both sides of the sealing plate.

[0008] Preferably, the size of the insert plate is adapted to the I-beam connecting block, and the inner wall of the end of the mating groove is provided with a threaded hole adapted to the bolt.

[0009] Preferably, the triangular band is arranged in the shape of an isosceles triangle, and the included angle between the two sets of hypotenuses on the side of the triangular band away from the protective sleeve is set as an acute angle.

[0010] Preferably, the number of the oblique holes is set in multiple sets, and the multiple sets of oblique holes are evenly distributed in a linear array in the vertical direction on the left and right sides of the protective sleeve. The inner diameter of the oblique holes gradually decreases from bottom to top, and the oblique holes are inclined with the side closer to the center of the protective sleeve being higher and the side farther away from the center of the protective sleeve being lower.

[0011] Preferably, an arc-shaped band is fixedly installed on the side of the protective sleeve, and a fan-shaped groove is formed on the inner wall of the arc-shaped band.

[0012] Preferably, the arc-shaped band is arranged in an inverted V shape and is located in the gap between two adjacent sets of inclined holes. The number of fan-shaped grooves is set to multiple sets, and the multiple sets of fan-shaped grooves are evenly distributed inside the arc-shaped band.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: Through the cooperation and transmission of the I-beam connecting block, mating groove, closed groove, insert plate, closed plate, bolt, protrusion, closed belt, protective sleeve, V-belt, protective cavity, and oblique hole, the operator can directly pull out the fuse protected in the protective sleeve at the gap between the upper and lower shells without completely emptying the quartz sand in the inner cavity. Furthermore, the several oblique holes provided on the side of the protective sleeve ensure that some quartz sand will still enter the protective cavity and contact the fuse when it is inserted into the inner cavity, thus preventing the fuse from generating sparks and affecting the safety of the fuse. The insert plate and closed plate provided on the side make the entire fuse more convenient and efficient to replace and maintain. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is an exploded view of the present invention; Figure 3 This is a schematic diagram showing the insert plate and protective sleeve separated in this utility model. Figure 4 This utility model Figure 3Enlarged view of region A in the middle; Figure 5 This is a schematic diagram showing the protective sleeve and the I-beam connecting block of this utility model in a separated state; Figure 6 This is a cross-sectional view of the protective sleeve of this utility model.

[0015] The components represented by each number in the attached diagram are listed below: 1. Lower housing; 2. Upper housing; 3. Contact; 4. Fuse; 5. I-beam connector; 6. Butt groove; 7. Enclosed groove; 8. Insert plate; 9. Enclosed plate; 10. Bolt; 11. Raised strip; 12. Enclosed strip; 13. Protective sleeve; 14. V-belt; 15. Protective cavity; 16. Angled hole; 17. Arc-shaped strip; 18. Sector-shaped groove. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] Please see Figures 1-6 The diagram shows a fuse with a protective device, including a lower housing 1, an upper housing 2 detachably connected to the top of the lower housing 1, a contact 3 detachably installed at the end of the lower housing 1, a fuse element 4 provided on the inner side of the contact 3 near the lower housing 1, a protective assembly provided between the lower housing 1 and the upper housing 2, the protective assembly including a mating groove 6, the mating groove 6 being opened on the inner wall of the end of the lower housing 1, a closed groove 7 being opened on the side of the lower housing 1, an I-beam connecting block 5 detachably installed inside the mating groove 6, a protective sleeve 13 being fixedly installed on the side of the I-beam connecting block 5 near the inner wall of the lower housing 1, a triangular belt 14 being fixedly installed at the upper and lower ends of the protective sleeve 13, a protective cavity 15 being opened inside the protective sleeve 13, and an oblique hole 16 being opened on the side wall of the protective sleeve 13.

[0018] Please see Figure 1 , Figure 2 There are two sets of I-shaped connecting blocks 5, and the I-shaped connecting blocks 5 have internal connection ports to facilitate the connection between the contact 3 and the fuse 4. At the same time, the mating groove 6 is adapted to the size of the I-shaped connecting blocks 5, so that the I-shaped connecting blocks 5 can be locked in the mating groove 6. This facilitates the temporary fixation of the I-shaped connecting blocks 5, the contact 3 and the protective sleeve 13 during installation, making it convenient for the workers to assemble. Specifically, the upper shell 2 and the lower shell 1 are completely identical and mirror images of each other to facilitate the assembly and use of the fuse.

[0019] An insert plate 8 is slidably installed inside the docking groove 6. A sealing plate 9 is fixedly installed on the side of the insert plate 8 away from the center of the lower housing 1. A bolt 10 is rotatably installed inside the insert plate 8. A protruding strip 11 is fixedly installed on the side wall of the insert plate 8. Sealing strips 12 are fixedly installed on the outer walls of both sides of the sealing plate 9.

[0020] Please see Figure 3 , Figure 4 as well as Figure 5 There are two sets of insert plates 8, which are respectively set at both ends of the sealing plate 9 to match the two ends of the lower housing 1, so as to connect and install the two I-shaped connecting blocks 5 at both ends of the lower housing 1. At the same time, the protrusion 11 is matched with the size of the docking groove 6, and the sealing strip 12 is matched with the size of the sealing groove 7 between the upper housing 2 and the lower housing 1. So that after the upper housing 2 and the lower housing 1 are spliced ​​and installed, the insert plates 8 and the sealing plate 9 can seal the connection between the upper housing 2 and the lower housing 1. At the same time, the combination of the insert plates 8 and the sealing plate 9 can be pulled out along this path to expose the cavity inside the upper housing 2 and the lower housing 1, and then the fuse 4 inside can be removed.

[0021] The size of the insert plate 8 is adapted to the I-beam connecting block 5, and the inner wall of the end of the mating groove 6 is provided with a threaded hole adapted to the bolt 10.

[0022] Please see Figure 3 , Figure 4 After the insert plate 8 is inserted into the docking groove 6, it can stably clamp the I-beam connecting block 5, preventing the I-beam connecting block 5 from falling off. At the same time, through the cooperation of the threaded hole and the bolt 10, the insert plate 8 can be detachably connected in the docking groove 6, which is convenient for the staff to maintain and replace the internal equipment.

[0023] The V-belt 14 is arranged in an isosceles triangle, and the included angle between the two sets of hypotenuses on the side of the V-belt 14 away from the protective sleeve 13 is set as an acute angle.

[0024] Please see Figure 3 , Figure 5 as well as Figure 6 The V-belt 14 makes the resistance encountered by the protective sleeve 13 when it is inserted into and pulled out of the cavity between the upper housing 2 and the lower housing 1 relatively small. Especially when the cavity between the upper housing 2 and the lower housing 1 is filled with quartz sand, the V-belt 14 can better cooperate with the protective sleeve 13 to remove it. At the same time, the protective sleeve 13 wraps around the outside of the fuse 4 to protect it and prevent the quartz sand from bending and damaging the fuse 4.

[0025] The oblique holes 16 are arranged in multiple sets, and the multiple sets of oblique holes 16 are evenly distributed in a vertical linear array on the left and right sides of the protective sleeve 13. The inner diameter of the oblique holes 16 gradually decreases from bottom to top, and the oblique holes 16 are inclined with the side closer to the center of the protective sleeve 13 being higher and the side farther away from the center of the protective sleeve 13 being lower.

[0026] Please see Figure 6 The inclined arrangement of the oblique hole 16 allows the quartz sand to enter the protective cavity 15 and come into contact with the fuselage 4 when the protective sleeve 13 enters the cavity between the upper shell 2 and the lower shell 1. However, due to the restriction of the protective sleeve 13, the quartz sand will not excessively compress the fuselage 4, thus providing a certain protection for the fuselage 4 and ensuring its quality of use.

[0027] An arc-shaped band 17 is fixedly installed on the side of the protective sleeve 13, and a fan-shaped groove 18 is opened on the inner wall of the arc-shaped band 17.

[0028] Please see Figure 5 , Figure 6 The outer edge of the arc-shaped band 17 faces away from the protective sleeve 13, thereby further reducing the resistance of the quartz sand on the side of the protective sleeve 13 when the arc-shaped band 17 is inserted into the cavity between the upper shell 2 and the lower shell 1 along with the protective sleeve 13, and at the same time guiding the quartz sand to prevent it from entering the protective cavity 15 inside the protective sleeve 13 in large quantities.

[0029] The arc-shaped band 17 is arranged in an inverted V shape and is located in the gap between two adjacent sets of inclined holes 16. There are multiple sets of fan-shaped grooves 18, which are evenly distributed inside the arc-shaped band 17.

[0030] Please see Figure 6 The inverted V-shaped design of the arc-shaped belt 17 can reduce the resistance of the quartz sand to the arc-shaped belt 17 to a certain extent. While providing protection for the protective sleeve 13, it also facilitates the insertion of the protective sleeve 13 when the quartz sand fills the cavity between the lower shell 1 and the upper shell 2, making it convenient for maintenance and replacement by the staff. The design of the fan-shaped groove 18 allows some of the quartz sand to move through the fan-shaped groove 18, further reducing the resistance of the arc-shaped belt 17 and facilitating the safe insertion of the protective sleeve 13.

[0031] Working principle: The operator uses a screwdriver to rotate the top of the bolt 10 to loosen the bolt 10, thereby releasing the limiting position of the mating groove 6 on the insert plate 8. When the bolts 10 in the two sets of insert plates 8 are completely loosened, the operator pulls the combination of the insert plate 8 and the sealing plate 9 upward to expose the cavity between the upper shell 2 and the lower shell 1. At this time, the operator holds the combination of the upper shell 2 and the lower shell 1 with both hands, hooks the I-shaped connecting blocks 5 on both sides with his / her fingers, and pushes upward to pull out the I-shaped connecting blocks 5, the contact 3, the protective sleeve 13 and the fuse 4 upward. When fully withdrawn, the staff replaces the fuse 4 inside the protective sleeve 13; After replacement, insert the I-shaped connecting block 5 along the mating groove 6 according to the above holding method. The fuse 4 enters the cavity between the upper housing 2 and the lower housing 1 under the protection of the outer protective sleeve 13. Then insert the insert plate 8 into the mating groove 6 again and tighten the bolt 10 to complete the replacement and maintenance of the fuse 4.

[0032] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fuse with a protective device, comprising a lower housing (1), characterized in that: The top of the lower housing (1) is detachably connected to the upper housing (2). The end of the lower housing (1) is detachably installed with a contact (3). The contact (3) is provided with a fuse (4) on the side of the lower housing (1) near the inside. A protective component is provided between the lower housing (1) and the upper housing (2). The protective component includes a docking groove (6). The docking groove (6) is opened on the inner wall of the end of the lower housing (1). A closed groove (7) is opened on the side of the lower housing (1). An I-shaped connecting block (5) is detachably installed inside the docking groove (6). A protective sleeve (13) is fixedly installed on the side of the I-shaped connecting block (5) near the inner wall of the lower housing (1). A triangular belt (14) is fixedly installed at the upper and lower ends of the protective sleeve (13). A protective cavity (15) is opened inside the protective sleeve (13). An oblique hole (16) is opened on the side wall of the protective sleeve (13).

2. A fuse with a protective device according to claim 1, characterized in that: The insertion plate (8) is slidably installed inside the docking groove (6). A sealing plate (9) is fixedly installed on the side of the insertion plate (8) away from the center of the lower housing (1). A bolt (10) is rotatably installed inside the insertion plate (8). A protruding strip (11) is fixedly installed on the side wall of the insertion plate (8). Sealing strips (12) are fixedly installed on the outer walls of both sides of the sealing plate (9).

3. A fuse with a protective device according to claim 2, characterized in that: The size of the insert plate (8) is adapted to the I-beam connecting block (5), and the inner wall of the end of the mating groove (6) is provided with a threaded hole adapted to the bolt (10).

4. A fuse with a protective device according to claim 1, characterized in that: The triangular band (14) is arranged in an isosceles triangle, and the included angle between the two sets of hypotenuses on the side of the triangular band (14) away from the protective sleeve (13) is set as an acute angle.

5. A fuse with a protective device according to claim 1, characterized in that: The number of the oblique holes (16) is set in multiple sets. The multiple sets of oblique holes (16) are evenly distributed in a linear array in the vertical direction on the left and right sides of the protective sleeve (13). The inner diameter of the oblique holes (16) gradually decreases from bottom to top. At the same time, the oblique holes (16) are inclined with the side closer to the center of the protective sleeve (13) being higher and the side farther away from the center of the protective sleeve (13) being lower.

6. A fuse with a protective device according to claim 5, characterized in that: An arc-shaped band (17) is fixedly installed on the side of the protective sleeve (13), and a fan-shaped groove (18) is opened on the inner wall of the arc-shaped band (17).

7. A fuse with a protective device according to claim 6, characterized in that: The arc-shaped band (17) is arranged in an inverted V shape and is located in the gap between two adjacent sets of inclined holes (16). The number of fan-shaped grooves (18) is arranged in multiple sets, and the multiple sets of fan-shaped grooves (18) are evenly distributed inside the arc-shaped band (17).

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