Fusion tube cooling structure of drop-out fuse
By installing a water storage shell around the outside of the fusion tube, heat exchange is achieved between rainwater and water inside the storage shell, solving the problem of the small heat dissipation area of the fusion tube, realizing effective heat dissipation and timely cooling, and extending the service life of the fusion tube.
Patent Information
- Application Number
- CN202423030465.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-10
AI Technical Summary
During high temperatures in summer, the heat dissipation area of the drop-out fuse tube is small, resulting in excessively high temperatures and shortening its service life.
No. 1 and No. 2 water storage shells are installed on the outside of the molten tube. The rainwater and the water in the water storage shells are used for heat exchange to increase the heat dissipation area. After the molten tube falls, the water in the water storage shells cools the molten tube in time.
By increasing the heat dissipation area and timely cooling, the temperature rise of the melting tube can be reduced, the service life can be extended, and the probability of fire can be reduced.
Smart Images
Figure CN223486987U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of drop-out fuse technology, specifically to a cooling structure for the fuse tube of a drop-out fuse. Background Technology
[0002] The working principle of a drop-out fuse can be divided into three stages: normal operation, fault occurrence, and after the fuse has blown.
[0003] During normal operation: The moving contacts at both ends of the fuse tube, relying on the tension of the fuse wire, push the upper moving contact into the "duckbill" protrusion and make tight contact with the upper stationary contact, forming a closed state. At this time, current can flow normally through the fuse tube.
[0004] In case of a fault: When a short circuit occurs in the circuit, the excessive current will cause the fuse to melt, generating an electric arc. Under the high temperature of the electric arc, the steel paper tube lining the fuse tube will decompose and generate a large amount of gas. This gas will form high pressure inside the fuse tube and be ejected downwards, extinguishing the electric arc.
[0005] After the fuse blows: After the fuse blows, it loses its tension, the movable joint is released, and the fuse tube falls rapidly under the spring pressure of the upper and lower stationary contacts and the weight of the fuse tube itself, thereby cutting off the faulty circuit.
[0006] During the high temperatures of summer, the circuit load is large, and the existing fuse tubes have a small outer diameter and a small heat dissipation area, which can lead to excessively high internal temperatures, thus seriously affecting the service life of the fuse. Utility Model Content
[0007] To address the aforementioned technical deficiencies, this invention provides a cooling structure for the fuse tube of a drop-out fuse, which accelerates heat dissipation from the fuse tube and increases its service life.
[0008] This utility model discloses a cooling structure for a drop-out fuse tube, including a fuse tube lined with a steel paper tube, a fuse wire disposed inside the steel paper tube, an upper moving contact at the upper end of the fuse tube, a lower moving contact at the lower end of the fuse tube, and a first water storage shell and a second water storage shell fitted around the outside of the fuse tube. The first water storage shell includes a first cylindrical body, a first annular connecting part, and a first annular fixing part. The inner diameter of the first annular fixing part is equal to the outer diameter of the fuse tube, and the first annular fixing part is fitted and fixed to the upper end of the fuse tube. The inner diameter of the first cylindrical body is larger than the outer diameter of the fuse tube. The first cylinder is coaxially sleeved on the outside of the melt tube. The first cylinder is connected to the first annular fixing part through the first annular connecting part. The first annular connecting part is provided with a vent hole. The second water storage shell includes the second cylinder, the second annular connecting part and the second annular fixing part. The inner diameter of the second annular fixing part is equal to the outer diameter of the melt tube. The second annular fixing part is sealed and fixed at the lower end of the melt tube. The inner diameter of the second cylinder is larger than the outer diameter of the first cylinder. The second cylinder is coaxially sleeved on the outside of the first cylinder. The second cylinder is connected to the second annular fixing part through the second annular connecting part.
[0009] When the above structure is used outdoors, the end with the upper moving contact is on top, and the end with the lower moving contact is on the bottom. When it rains, rainwater will flow into the outer side of the first water storage shell and be stored in the second water storage shell. The water in the second water storage shell comes into contact with the outer side of the fuse tube and quickly exchanges heat, carrying away the heat inside the fuse tube. The water in the second water storage shell then exchanges heat with the outside through the second water storage shell. Since the outer diameter of the second cylinder on the second water storage shell is larger than the outer diameter of the fuse tube, the heat exchange area is greatly increased, which can effectively dissipate the heat of the fuse tube. At the same time, when a short circuit fault occurs, the excessive current will cause the fuse to melt and the fuse tube to fall. During the melting process, the internal temperature of the fuse tube will be very high. However, after falling, some of the water in the second water storage shell will remain in the first water storage shell to cool down the fuse tube in time, reducing the probability of the fuse tube catching fire. It should be noted that the water in the first water storage shell will flow out from the vent hole set on the first annular connection part, but the outflow speed is very slow.
[0010] Preferably, the inner diameter of the second cylinder is 2.5 times the outer diameter of the molten tube, which greatly increases the heat dissipation area.
[0011] Furthermore, the inner diameter of the No. 2 cylinder is 0.4 cm larger than the outer diameter of the No. 1 cylinder, and the inner wall of the No. 2 cylinder is closer to the outer wall of the No. 1 cylinder. This not only reduces the evaporation of water in the No. 2 water storage shell, but also ensures that most of the water in the No. 2 water storage shell remains in the No. 1 water storage shell during a fall.
[0012] The beneficial effects of the drop-out fuse tube cooling structure obtained by this utility model are as follows: water is stored in the second water storage shell, and the water in the second water storage shell comes into contact with the outer surface of the fuse tube and exchanges heat quickly. The water in the second water storage shell then exchanges heat with the outside through the second water storage shell. Since the outer diameter of the second cylinder on the second water storage shell is larger than the outer diameter of the fuse tube, the heat exchange area is greatly increased, thereby effectively dissipating the heat of the fuse tube. At the same time, after the drop, some of the water in the second water storage shell will remain in the first water storage shell to cool the fuse tube in time, reducing the probability of the fuse tube catching fire. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model. Detailed Implementation
[0014] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.
[0015] Example 1:
[0016] like Figure 1 As shown, this utility model discloses a cooling structure for a drop-out fuse tube, including a fuse tube 2, a steel paper tube 3 lined inside the fuse tube 2, a fuse wire 4 disposed inside the steel paper tube 3, an upper moving contact 1 disposed at the upper end of the fuse tube 2, a lower moving contact 12 disposed at the lower end of the fuse tube 2, and a first water storage shell and a second water storage shell sleeved on the outside of the fuse tube 2. The first water storage shell includes a first cylinder 8, a first annular connecting part 6, and a first annular fixing part 5. The inner diameter of the first annular fixing part 5 is equal to the outer diameter of the fuse tube 2, and the first annular fixing part 5 is sleeved and fixed to the upper end of the fuse tube 2. The inner diameter of the first cylinder 8 is larger than the outer diameter of the fuse tube 2, and the first cylinder 8 is coaxially sleeved on the outside of the fuse tube 2. On the side, the first cylinder 8 is connected to the first annular fixing part 5 through the first annular connecting part 6. The first annular connecting part 6 is provided with a vent hole 7. The second water storage shell includes the second cylinder 9, the second annular connecting part 10 and the second annular fixing part 11. The inner diameter of the second annular fixing part 11 is equal to the outer diameter of the melt tube 2. The second annular fixing part 11 is sealed and fixed to the lower end of the melt tube 2. The inner diameter of the second cylinder 9 is 0.4 cm larger than the outer diameter of the first cylinder 8. The inner diameter of the second cylinder 9 is 2.5 times the outer diameter of the melt tube 2. The second cylinder 9 is coaxially sleeved on the outside of the first cylinder 8. The second cylinder 9 is connected to the second annular fixing part 11 through the second annular connecting part 10.
[0017] When the above structure is used outdoors, the end with the upper moving contact 1 is at the top, and the end with the lower moving contact 12 is at the bottom. When it rains, rainwater will flow into the outer side of the first water storage shell and be stored in the second water storage shell. The water in the second water storage shell comes into contact with the outer side of the fused tube 2 and quickly exchanges heat, carrying away the heat in the fused tube 2. The water in the second water storage shell then exchanges heat with the outside through the second water storage shell. Since the outer diameter of the second cylinder 9 on the second water storage shell is larger than the outer diameter of the fused tube 2, the heat exchange area is large. The current is greatly increased, which can effectively dissipate the heat of the fuse tube 2. At the same time, when a short circuit fault occurs in the circuit, the excessive current will cause the fuse 4 to melt and the fuse tube 2 to fall. During the melting process of the fuse 4, the internal temperature of the fuse tube 2 will be very high. However, after falling, some of the water in the second water storage shell will remain in the first water storage shell to cool down the fuse tube 2 in time, reducing the probability of the fuse tube 2 catching fire. It should be noted that the water in the first water storage shell will flow out from the vent 7 set on the first annular connection part 6, but the flow rate is very slow.
Claims
1. A cooling structure for a drop-out fuse tube, comprising a fuse tube (2), a steel paper tube (3) lined inside the fuse tube (2), a fuse wire (4) disposed inside the steel paper tube (3), an upper moving contact (1) disposed at the upper end of the fuse tube (2), and a lower moving contact (12) disposed at the lower end of the fuse tube (2), characterized in that, A first water storage shell and a second water storage shell are fitted around the outside of the molten tube (2). The first water storage shell includes a first cylinder (8), a first annular connecting part (6), and a first annular fixing part (5). The inner diameter of the first annular fixing part (5) is equal to the outer diameter of the molten tube (2). The first annular fixing part (5) is fitted and fixed to the upper end of the molten tube (2). The inner diameter of the first cylinder (8) is larger than the outer diameter of the molten tube (2). The first cylinder (8) is coaxially fitted around the outside of the molten tube (2). The first cylinder (8) is connected to the first annular fixing part (5) through the first annular connecting part (6). The connecting part (6) is provided with a vent hole (7). The second water storage shell includes a second cylinder (9), a second annular connecting part (10) and a second annular fixing part (11). The inner diameter of the second annular fixing part (11) is equal to the outer diameter of the melt tube (2). The second annular fixing part (11) is sealed and fixed at the lower end of the melt tube (2). The inner diameter of the second cylinder (9) is greater than the outer diameter of the first cylinder (8). The second cylinder (9) is coaxially sleeved on the outside of the first cylinder (8). The second cylinder (9) is connected to the second annular fixing part (11) through the second annular connecting part (10).
2. The cooling structure for a drop-out fuse tube according to claim 1, characterized in that, The inner diameter of the second cylinder (9) is 2.5 times the outer diameter of the melting tube (2).
3. The cooling structure for the fuse tube of a drop-out fuse according to claim 2, characterized in that, The inner diameter of the second cylinder (9) is 0.4 cm larger than the outer diameter of the first cylinder (8).