Tandem line protector
By using a modular series circuit protector with threaded locking connection and quick-release design, the problems of heat accumulation and contact pressure attenuation under high current charging of power lines are solved, thus achieving safe circuit protection and simplified maintenance.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2026-04-07
AI Technical Summary
Existing power cords are prone to continuous Joule heating under high-current charging conditions, leading to thermal degradation of insulation materials and oxidation of conductors. Furthermore, spring-loaded fuses experience contact pressure attenuation under mechanical vibration, forming localized hot spots, increasing the risk of fire, and are complex to maintain.
The modular series circuit protector uses a hot-melt fuse that is threaded and locked inside the housing to increase the heat dissipation area and melts to cut off the circuit when the current exceeds the limit. It is designed with a quick-release protective cover and standard interface to simplify replacement and adapt to harsh working conditions.
It effectively prevents heat buildup, reduces maintenance complexity, ensures circuit safety, adapts to dusty and humid environments, and enables rapid fuse replacement.
Smart Images
Figure CN224096681U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a series connection type line protector, concretely is a circuit design of series connection hot melt fuse, its principle is in the live wire series connection a hot melt fuse, perceives the current inside the electric wire, when the circuit failure, instantaneous current is overproof, the fuse wire temperature rises because of heat, and fuses when reaching its melting point, thereby cutting off the circuit, plays the role of protecting the circuit. BACKGROUND
[0002] As a basic component of power transmission, power lines have been deeply integrated into various production and life scenes in modern society. With the rapid development of the new energy vehicle industry, the large current charging working condition puts forward more stringent requirements on the cable system: the persistent joule heat generated during the charging process can accelerate the thermal degradation of the insulation material and the oxidation process of the conductor, and in extreme cases, it may induce short circuit or arc discharge, forming a fire risk. Some charging plugs adopt a spring crimp type fuse integrated scheme, and the dynamic contact interface is prone to nonlinear attenuation of contact pressure under the action of mechanical vibration and high frequency plugging stress, resulting in an increase in contact impedance and the formation of local hot spots. Restricted by the compact plug structure, heat forms a self-excited heat accumulation effect in the closed cavity, significantly accelerating the material aging rate. SUMMARY
[0003] To solve the above problems, the purpose of the utility model is to provide a modular line protector.
[0004] In order to achieve the above technical purpose, the technical scheme of the utility model is:
[0005] A series connection type line protector, comprising a shell with an open inner cavity structure, the shell is provided with a protective cover, a first positioning groove and a second positioning groove are arranged in the shell, a first limiting nut is arranged in the first positioning groove, the first limiting nut is matched with a first fastening screw, a second limiting nut is arranged in the second positioning groove, the second limiting nut is matched with a second fastening screw, a fuse link is arranged between the first limiting nut and the second limiting nut, one end of the fuse link is connected to the first limiting nut through the first fastening screw, the other end of the fuse link is connected to the second limiting nut through the second fastening screw, the first limiting nut is connected with a first positioning terminal through the first fastening screw, the second limiting nut is connected with a second positioning terminal through the second fastening screw, the fuse link is connected in series on the wire through the first positioning terminal and the second positioning terminal, one side of the fuse cover is hinged to the shell, the other side of the fuse cover is connected to the shell through a buckle.
[0006] The buckle comprises a clamping hook and a clamping groove, the clamping hook is arranged on the protective cover, and the clamping groove is arranged on the shell.
[0007] The utility model discloses a line protector is external independent protection unit, and the hot melt fuse is transferred from the inside of the plug to the special protection shell, and the spring clamp connection is replaced by the thread mechanical locking, eliminates the risk of contact surface loosening, can expand the heat dissipation surface area simultaneously, avoids heat accumulation, and under the condition of instantaneous current overproof, the temperature is too high and will melt the fuse, to cut off the circuit, completes the protection of the electric appliance in the circuit. Secondly, the quick detachable protection cover and standard interface design make the fuse replacement not need to disassemble the plug body, and only need to open the protection cover when operating to complete the fuse replacement, and the maintenance complexity is reduced obviously. In addition, the modular structure allows the fuse specification to be configured according to the charging power grading. Finally, the protection shell can be designed as dustproof and waterproof, ensuring the long-term stability under the harsh conditions of high humidity, dust and the like. BRIEF DESCRIPTION OF DRAWINGS
[0008] The utility model will be further explained in detail in combination with the drawings and specific embodiment.
[0009] Figure 1 It is line protector structure explosion schematic drawing.
[0010] Figure 2 It is wire and protection cover position structure schematic drawing.
[0011] Figure 3 It is fuse assembly whole schematic drawing.
[0012] Figure 4 It is line protector finished product schematic drawing. SPECIFIC EMBODIMENT
[0013] As Figures 1-4 Shown, a kind of series line protector, including the shell with open inner cavity structure, first positioning groove 13 and second positioning groove 14 are arranged in the shell, first limiting nut 2 is arranged in the first positioning groove 14, first positioning groove 14 limits first limiting nut 2, first limiting nut 2 is screwed with first fastening screw 9, second limiting nut 3 is arranged in the second positioning groove 14, second positioning groove 14 limits second limiting nut 3, second limiting nut 3 is equipped with second fastening screw 10.
[0014] The fuse 8 is connected between the first limiting nut 2 and the second limiting nut 3, one end of the fuse 8 is connected to the first limiting nut 2 through the first fastening screw 9, the other end of the fuse 8 is connected to the second limiting nut 3 through the second fastening screw 10, the first limiting nut 2 is connected to the first positioning terminal 4 through the first fastening screw 9, the first positioning terminal 4 is riveted and connected to the end of the first live wire 4, the second limiting nut 3 is connected to the second positioning terminal 5 through the second fastening screw 10, the second positioning terminal 5 is riveted and connected to the end of the second live wire 7, and the fuse 8 is connected in series between the first live wire 4 and the second live wire 7 through the first positioning terminal 4 and the second positioning terminal 5.
[0015] The shell is provided with a protective cover 1, one side of the protective cover 1 is hinged to the shell, and the other side of the protective cover 1 is connected to the shell through a buckle, the buckle comprises a clamping hook 11 and a clamping groove 12, the clamping hook 11 is arranged on the protective cover 1, and the clamping groove 12 is arranged on the shell.
[0016] Assembly steps:
[0017] 1. The first live wire 6 and the second live wire 7 are stripped according to the design requirements, the length of the exposed copper wire is controlled, and the size is confirmed again after stripping to meet the requirements; 2. The first positioning terminal 4 and the second positioning terminal 5 are riveted and connected to the first live wire 6 and the second live wire 7 respectively according to the design requirements, and the riveting size is confirmed to meet the requirements; 3. The live wire with the riveted terminal is tightened through the first fastening screw 9 and the second fastening screw 10 at the first limiting nut 2 and the second limiting nut 3 of the shell; 4. Finally, the protective cover clamping hook 2 is turned and clamped in the protective cover clamping groove 12; after completion, it is necessary to detect whether the size is reasonable and whether the appearance is good according to the drawing.
[0018] The above embodiment does not limit the utility model in any way, and any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the utility model.
Claims
1. A series-type line protector, comprising a housing with an open inner cavity structure, the housing being provided with a protective cover, characterized in that: The housing is provided with a first positioning groove and a second positioning groove. A first limiting nut is provided in the first positioning groove, and a first fastening screw is fitted to the first limiting nut. A second limiting nut is provided in the second positioning groove, and a second fastening screw is fitted to the second limiting nut. A fuse is provided between the first limiting nut and the second limiting nut. One end of the fuse is connected to the first limiting nut via the first fastening screw, and the other end of the fuse is connected to the second limiting nut via the second fastening screw. A first positioning terminal is connected to the first limiting nut via the first fastening screw, and a second positioning terminal is connected to the second limiting nut via the second fastening screw. The fuse is connected in series with the first positioning terminal and the second positioning terminal on a wire. One side of the protective cover is hinged to the housing, and the other side of the protective cover is connected to the housing via a buckle.
2. The series-type line protector according to claim 1, characterized in that: The buckle includes a hook and a slot.
3. A series-type line protector according to claim 2, characterized in that: The hook is located on the protective cover, and the slot is located on the housing.