Fusing type power line assembly with thermal buffering function

Abstract

The invention discloses a fusing type power line assembly with a thermal buffering function. The fusing type power line assembly comprises a bottom shell, a fuse and an outer shell. An integrated copper pin and an integrated partition plate are arranged in the bottom shell, and the partition plate is located between the copper pin and the outer side wall of the bottom shell, so that an independent heat insulation cavity is formed through division. And the fuse is arranged in an area between the partition plate and the copper pin and is connected in series in a live wire loop. According to the structure, the physical isolation and air heat insulation layer is established between the heating fuse and the side wall of the shell, so that direct conduction of heat to the side wall is effectively slowed down, the surface temperature of the side wall of the shell at the corresponding position is remarkably reduced, local overheating and scalding risks are avoided, and the use safety and comfort are improved.

Description

Technical Field

[0001] This invention relates to the field of plug technology, and more particularly to a power cord assembly with an integrated fuse, especially a fusible power cord assembly with heat buffering function. Background Technology

[0002] With the increasing power of electrical equipment and the stricter electrical safety standards, integrating fuses into plugs has become a common way to improve electrical safety. These plugs typically connect the fuse in series with the live wire circuit. When an overload occurs or a short circuit happens, the fuse melts to cut off the circuit, thus protecting downstream equipment and the circuit itself.

[0003] However, due to limitations in the internal space layout of the plug or for structural compactness considerations, some existing fuse plugs place the fuse close to the side wall of the plug housing (such as the front, left, or right side walls). When the fuse operates under normal rated load, it generates significant heat, with temperatures far exceeding ambient temperatures (e.g., above 50°C). When this heat source is in close contact with the side wall of the housing, the heat is rapidly conducted to the housing surface, resulting in noticeable localized high-temperature spots. Users may experience burning sensations or discomfort when plugging or unplugging the plug or accidentally touching these hot spots, posing safety hazards and affecting the user experience. Secondly, uneven temperature distribution on the housing surface may interfere with the accurate assessment of the plug's overall heat dissipation performance, even leading to misjudgments. For example, the "Combined Safety Plug with Fuse" disclosed in Chinese Patent Publication No. CN2737002Y has a fuse installation position close to the side wall, which results in excessively high localized temperatures on the side wall. Summary of the Invention

[0004] The purpose of this invention is to provide a fuse-type power cord assembly with heat buffering function. This power cord assembly effectively slows down the direct conduction of heat to the side wall by setting a heat insulation cavity that physically isolates the fuse and the side wall of the housing, thereby avoiding local overheating of the side wall.

[0005] To achieve the above-mentioned technical objectives, the technical solution of the present invention is as follows:

[0006] A fusible power cord assembly with thermal buffer function includes a bottom shell, a fuse, and an outer shell that seals the top of the bottom shell; the bottom shell has an integrated copper foot, which includes a flat plate and a neutral copper foot, a live copper foot, and a ground copper foot vertically mounted on the flat plate; the neutral copper foot, the live copper foot, and the ground copper foot pass through corresponding through holes opened at the bottom of the bottom shell.

[0007] On one side of the integrated copper pin (such as the front, left, or right side), a partition is integrally formed inside the bottom shell. The partition is located between the integrated copper pin and the corresponding outer wall of the bottom shell, and divides the internal space of the bottom shell on that side into an independent heat insulation cavity. The fuse is located in the area between the partition and the integrated copper pin and is connected in series in the live wire circuit of the plug.

[0008] With the above structure, the fuse, which generates heat during operation, is separated from the side wall of the plug housing by the partition and the heat insulation cavity. The air inside the heat insulation cavity forms a heat buffer layer, slowing down the rate at which heat is directly conducted through the housing material to the outer wall, allowing heat to be dissipated more evenly through other paths (such as other walls of the bottom shell), thereby reducing the surface temperature of the outer wall at the location of the fuse and eliminating localized high-temperature points.

[0009] Furthermore, multiple reinforcing plates are provided between the partition and the outer wall of the bottom shell to connect the two. These reinforcing plates can increase the overall structural strength and deformation resistance of the outer shell in the area where the heat insulation cavity is located, without significantly affecting its heat insulation effect.

[0010] Furthermore, in the area between the partition and the integrated copper foot, the bottom shell is provided with two spaced-apart brackets and a support plate for supporting the fuse, the support plate being connected to the two brackets.

[0011] Furthermore, the top of the bracket is provided with an upward-facing support column, and the support plate is provided with support column through holes that are adapted to the support column. During installation, the support column passes through the support column through holes, thereby achieving rapid and accurate positioning of the support plate.

[0012] Furthermore, after the support plate is installed, the fuse is positioned in the middle region of the plug height direction in the vertical direction. This arrangement avoids the fuse being too close to the top or bottom of the plug housing, thus preventing the creation of new localized hot spots, and also facilitates the installation and fixation of the fuse.

[0013] Furthermore, the fuse is a surface mount fuse, and the support plate is the circuit board that carries the surface mount fuse. This design results in a compact structure.

[0014] Furthermore, a positioning hole is provided in the central area of ​​the flat plate, and a corresponding upward-protruding positioning post is provided at the bottom of the bottom shell, the positioning post being inserted into the positioning hole. This structure is used to assist in determining the position of the integrated copper foot in the bottom shell.

[0015] Furthermore, the bottom of the inner shell is provided with multiple locking posts, and the flat plate is provided with locking holes that mate with the locking posts. Through the locking engagement of the locking posts and the locking holes, the one-piece copper feet can be securely locked inside the inner shell.

[0016] The beneficial effects provided by this invention are:

[0017] 1. Through the built-in partition and the heat insulation cavity formed therein, a physical isolation and air insulation layer are established between the heated fuse and the side wall of the outer casing, weakening the direct heat conduction path. This significantly reduces the surface temperature of the side wall and makes it more evenly distributed, avoiding the risk of burns when users come into contact with it, and improving the safety and comfort of using the product.

[0018] 2. The reinforcing plate set between the partition and the outer wall enhances the mechanical strength and impact and compression resistance of the outer shell of the insulation cavity area, preventing the area from deforming due to external compression and ensuring the long-term effectiveness of the insulation structure.

[0019] 3. The fuse is positioned in the middle of the plug in the vertical direction by means of the bracket and support plate, which avoids excessive heat concentration at the top or bottom of the plug housing.

[0020] 4. This isolation and heat dissipation structure can be flexibly arranged on the front, left or right side of the plug as needed to adapt to different internal layout requirements and has a wide range of applications. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a three-dimensional exploded view of a fuse plug.

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the bottom shell.

[0024] Figure 3 This is a schematic diagram of a three-dimensional structure for an integrated copper foot.

[0025] Figure 4 A three-dimensional structural diagram of the assembled base shell and integrated copper feet (including fuses and support plates).

[0026] Explanation of reference numerals in the attached figures:

[0027] 1-Bottom shell; 11-Front sidewall; 12-Baffle; 13-Insulation cavity; 14-Reinforcing plate; 15-Bracket; 151-Column; 16-Support plate; 161-Column perforation; 17-Positioning post; 18-Clamping post;

[0028] 2-Integrated copper pin; 21-Flat plate; 211-Positioning hole; 212-Clip hole; 22-Neutral copper pin; 23-Live copper pin; 24-Ground copper pin; 25-Live crimp post; 26-Neutral crimp post; 27-Ground crimp post;

[0029] 3-Fuse; 4-Casing. Detailed Implementation

[0030] like Figures 1 to 4 As shown, a fusible power cord assembly with thermal buffer function includes a bottom shell 1, an integrated copper foot 2, a fuse 3, and an outer shell 4 that encloses the top of the bottom shell 1.

[0031] The integrated copper feet 2 are housed within the base shell 1 and include a flat plate 21 and neutral wire copper feet 22, live wire copper feet 23, and ground wire copper feet 24 vertically mounted on the flat plate 21. These copper feet pass through corresponding through holes on the bottom of the base shell 1 for connection to external sockets. To ensure accurate positioning and secure fixation of the integrated copper feet 2 within the base shell 1, a positioning hole 211 is provided in the center of the flat plate 21, and a corresponding upward-protruding positioning post 17 is provided at the bottom of the base shell 1. During assembly, the positioning post 17 is inserted into the positioning hole 211 for initial positioning. Simultaneously, multiple locking posts 18 are also provided at the bottom of the base shell 1, and the flat plate 21 has corresponding locking holes 212, which securely lock the integrated copper feet 2 through locking engagement.

[0032] The top of the plate 21 is also provided with a live wire crimp post 25, a neutral wire crimp post 26 and a ground wire crimp post 27 for connecting internal wires.

[0033] Inside the bottom shell 1, and on one side of the integrated copper foot 2 (taking the front side as an example in this embodiment), a partition 12 is integrally formed. This partition 12 is located between the integrated copper foot 2 and the front sidewall 11 of the bottom shell 1, thereby dividing the internal space of the bottom shell 1 on this side into an independent, sealed or semi-sealed heat insulation cavity 13. Between the partition 12 and the front sidewall 11, a plurality of reinforcing plates 14 are also provided to connect the two, in order to enhance the structural strength of this area.

[0034] The fuse 3 is located in the area between the partition plate 12 and the integrated copper foot 2, specifically supported by a support plate 16. Two spaced-apart brackets 15 are provided in this area inside the bottom shell 1, and the two ends of the support plate 16 are connected to these two brackets 15. An upward-facing support column 151 is provided at the top of the support 15, and a corresponding support column through hole 161 is provided on the support plate 16. During installation, the support column 151 passes through the support column through hole 161, achieving quick alignment and support of the support plate 16. Preferably, the installation height of the support plate 16 is such that the fuse 3 on it is located in the middle area of ​​the plug height direction in the vertical direction, avoiding proximity to the top or bottom shell.

[0035] In this embodiment, the fuse 3 is preferably a surface mount fuse, and the support plate 16 is a printed circuit board (PCB) that carries the surface mount fuse, which has a compact structure.

[0036] Regarding circuit connections: Fuse 3 is connected in series in the live wire circuit. One end of it is connected to the live wire crimping post 25 via a wire (or PCB trace), and the other end is connected to the live wire inside the plug (not shown in the figure). The neutral wire and ground wire are crimped onto the neutral wire crimping post 26 and the ground wire crimping post 27, respectively.

[0037] Finally, the outer casing 4 is placed on top of the bottom casing 1 and secured, thus assembling the fuse plug of the present invention.

[0038] Working principle: When the plug is connected to the power supply and operates under load, the fuse 3 generates heat due to its own resistance. Because the fuse 3 is physically separated from the front sidewall 11 by the partition 12 and the heat insulation cavity 13, the air inside the heat insulation cavity 13 forms an effective heat buffer and insulation layer, preventing heat from being directly conducted to the front sidewall 11. Therefore, the surface temperature of the front outer casing corresponding to the fuse 3 position is significantly lower than in the prior art structure where the fuse is tightly attached to the sidewall, effectively eliminating localized high-temperature points and avoiding the risk of burns. The reinforcing plate 14 ensures the mechanical strength of the isolated area, and the central positioning of the support plate 16 promotes a balanced distribution of heat in the vertical direction.

[0039] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the invention. For example, the partition 12 and the heat insulation cavity 13 can be arranged on the left or right side according to layout requirements; the shape and number of reinforcing plates 14 can be adjusted; and the fuse 3 can also be fixed in other ways. The scope of protection of the invention is defined by the appended claims and their equivalents.

Claims

1. A fuse-type power cord assembly with heat buffer function, comprising a bottom shell (1), a fuse (3), and an outer shell (4) sealing the top of the bottom shell (1); the bottom shell (1) is provided with an integrated copper foot (2), the integrated copper foot (2) comprising a flat plate (21) and a neutral copper foot (22), a live copper foot (23), and a ground copper foot (24) vertically mounted on the flat plate (21); the neutral copper foot (22), the live copper foot (23), and the ground copper foot (24) respectively pass through corresponding through holes opened at the bottom of the bottom shell (1); characterized in that: On one side of the integrated copper foot (2), a partition (12) is provided inside the bottom shell (1). The partition (12) is located between the integrated copper foot (2) and the corresponding outer wall of the bottom shell (1), and divides the internal space of the bottom shell (1) on this side into an independent heat insulation cavity (13). The fuse (3) is located in the area between the partition (12) and the integrated copper pin (2), and is connected in series in the live wire circuit of the plug; In the area between the partition (12) and the integrated copper foot (2), the bottom shell (1) is provided with two spaced-apart brackets (15) and a support plate (16) for supporting the fuse (3). The support plate (16) is connected to the two brackets (15) so that the fuse (3) is located in the middle area of ​​the plug height direction in the vertical direction.

2. A fuse-type power cord assembly with thermal buffer function according to claim 1, characterized in that: A plurality of reinforcing plates (14) are provided between the partition (12) and the outer side wall (11) of the bottom shell (1) to connect the two.

3. A fuse-type power cord assembly with thermal buffer function according to claim 1, characterized in that: The top of the bracket (15) is provided with an upward support column (151), and the support plate (16) is provided with a support column through hole (161) adapted to the support column (151), through which the support column (151) passes.

4. A fuse-type power cord assembly with thermal buffer function according to claim 1, characterized in that: The fuse (3) is a surface mount fuse, and the support plate (16) is a circuit board that carries the surface mount fuse.

5. A fuse-type power cord assembly with thermal buffer function according to claim 1, characterized in that: The central area of ​​the flat plate (21) is provided with a positioning hole (211), and the bottom of the bottom shell (1) is provided with an upwardly protruding positioning post (17) at the corresponding position. The positioning post (17) is inserted into the positioning hole (211).

6. A fuse-type power cord assembly with thermal buffer function according to claim 1 or 5, characterized in that: The bottom of the bottom shell (1) is also provided with multiple locking posts (18), and the plate (21) is provided with locking holes (212) that cooperate with the locking posts (18).

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