CN120376385A - Safety fuse for electric automobile charging facility - Google Patents
Safety fuse for electric automobile charging facilityInfo
- Publication number
- CN120376385A CN120376385A CN202510721273.3A CN202510721273A CN120376385A CN 120376385 A CN120376385 A CN 120376385A CN 202510721273 A CN202510721273 A CN 202510721273A CN 120376385 A CN120376385 A CN 120376385A
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- China
- Prior art keywords
- fuse
- charging facility
- melt
- safety fuse
- shell
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Abstract
The invention discloses a safety fuse for an electric automobile charging facility, which relates to the technical field of circuit protection equipment and comprises a shell structure, a melt structure and an elastic mounting piece, wherein the shell structure comprises a mesoporous shell, detachable end covers are arranged at two ends of the mesoporous shell, round copper sheets are fixed at two ends of the melt body in the length direction, a bimetal arc sheet is arranged between the two round copper sheets, a fusing feedback assembly is arranged at the other side of the melt body, and the elastic mounting piece is arranged at the outer sides of the two round copper sheets. Through the bimetal arc piece that sets up, when the circuit appears lasting overload for bimetal arc piece is heated crooked, makes the fusing district produce the microcrack in advance, reduces the response delay of fuse, does benefit to the frequent start of filling the stake soon, through the fusing feedback subassembly that sets up, after the fuse-element body melts, can make the fusing feedback subassembly part stretch out the mesopore casing for prompt and feedback to maintainer, can in time change the fuse-element body.
Description
Technical Field
The invention relates to the technical field of circuit protection equipment, in particular to a safety fuse for an electric automobile charging facility.
Background
With the rapid development of the global new energy automobile industry, the large-scale construction and safe operation of electric automobile charging facilities become core problems of industry attention. As a core component of overcurrent protection of a charging system, the reliability of a fuse directly affects the safety of charging equipment and a battery system.
The conventional fuse generally adopts a rigid plug-in or fixed welding structure to realize the electrical connection between the melt and the electrode. In the charging process of the electric automobile, the electric automobile is influenced by factors such as vibration of a charging pile, especially road vibration under the working condition of a vehicle-mounted charger, cable plugging stress and the like, and a contact interface between a melt and an electrode is easy to loosen, oxidize or increase in clearance, so that contact resistance is increased.
When the circuit is continuously overloaded in the traditional fuse, the problem of response delay often occurs under high-power pulse load, which is not beneficial to frequent start-up and shutdown conditions of the quick-charging pile.
The insulating shell of the existing fuse generally adopts common epoxy resin materials, the heat dissipation performance is insufficient, the temperature rise of a melt is too high, the arc extinguishing efficiency is low, and after the melt is melted, maintenance personnel cannot immediately judge the state of the fuse.
In view of the above, the present invention is specifically proposed to solve the above-mentioned technical problems.
Disclosure of Invention
The invention aims to provide a safety fuse for an electric automobile charging facility, which aims to solve the technical problems that the contact surface of a fuse melt and an electrode of the fuse in the prior art is easy to loosen and the arc extinguishing efficiency is low.
The invention aims to provide a safety fuse for an electric automobile charging facility, which comprises the following components:
The shell structure comprises a middle hole shell, two ends of the middle hole shell are provided with detachable end covers to form a containing cavity, and the end covers are in threaded connection with electrode terminals;
the melt structure is detachably arranged in the accommodating cavity and comprises a melt body, circular copper sheets are fixed at two ends of the melt body in the length direction, a bimetal arc-shaped sheet is arranged between the two circular copper sheets and positioned at one side of the melt body, and a fusing feedback assembly is arranged at the other side of the melt body;
the elastic mounting piece is arranged on the outer sides of the two circular copper sheets, and the outer ends of the elastic mounting piece are electrically connected with the electrode terminals.
Further, the melt structure further comprises an insulation protection sleeve sleeved on the melt body, and two ends of the insulation protection sleeve are respectively abutted with the inner sides of the two circular copper sheets.
Further, the outer circumference of the insulating protective sleeve is sleeved with a plurality of cooling fins along the length direction of the insulating protective sleeve.
Further, two positioning convex strips are symmetrically arranged between the two circular copper sheets, the positioning convex strips are of a U-shaped structure, two ends of the U-shaped structure are respectively connected with the two circular copper sheets, and the radiating fins are positioned on the inner side of the U-shaped structure;
the two end surfaces of the inner side of the middle hole shell are provided with positioning clamping grooves, and two positioning convex strips are respectively detachably arranged in the two positioning clamping grooves.
Further, the fusing feedback assembly comprises a metal wire connected to the middle part of the melt body;
The wire facing away from the melt body one end is connected with a trigger pin;
The trigger pin is sleeved with a connecting plate in sliding connection, and four corners of the connecting plate are fixed on the inner wall of the middle hole shell through upright posts;
A spring is arranged between the inner wall of the middle hole shell and the connecting plate, the spring is sleeved on the trigger pin, and two ends of the spring are fixedly arranged on the outer wall of the connecting plate and the trigger pin respectively;
the middle hole shell is provided with a feedback hole coaxial with the trigger pin, and the upper end of the trigger pin is at least partially positioned in the feedback hole.
Further, a plurality of metal grid plates are arranged on the inner wall of the middle hole shell at one side deviating from the trigger pin, the metal grid plates are uniformly arranged along the length direction of the middle hole shell, and the metal grid plates are obliquely arranged.
Further, the inner side wall of the insulating protective sleeve is coated with a gas-generating ceramic coating.
Further, the elastic mounting piece comprises a metal telescopic rod, one end of the metal telescopic rod is electrically connected with the corresponding electrode terminal, the other end of the metal telescopic rod is provided with a contact copper sheet, the contact copper sheet is fixedly connected with the corresponding round copper sheet, and a buffer spring is sleeved between the contact copper sheet and the metal telescopic rod.
Further, an annular flange is sleeved at one end of the electrode terminal, which is away from the end cover, a plurality of mounting holes are uniformly distributed in the annular flange, and the annular flange is mounted on a mounting plate of the charging equipment through countersunk bolts and the mounting holes.
Further, the outer surface of the electrode terminal is subjected to silver plating or tin plating treatment.
By adopting the technical scheme, the invention has the following beneficial effects:
1. Through set up detachable end cover at mesopore casing both ends, be convenient for dismantle shell structure to dismantle and change the fuse-element body.
2. Through the bimetal arc piece that sets up, when the circuit appears lasting overload for bimetal arc piece is heated crooked, makes the fusing district produce the microcrack in advance, reduces the response delay of fuse, does benefit to the frequent start-stop of quick filling stake.
3. Through the elastic mounting piece that sets up, when electric automobile receives the vibration in-process that charges, elastic mounting piece carries out buffering shock attenuation to the fuse-element body, avoids fuse-element body and electrode terminal to appear breaking phenomenon, prevents that the contact resistance of fuse-element body and electrode terminal from rising.
4. Through the fusing feedback subassembly that sets up, after the fuse-element body melts, can make fusing feedback subassembly part stretch out the mesopore casing for prompt and feedback maintainer, can in time change the fuse-element body, guarantee to fill the steady operation of electric pile.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:
fig. 1 is a schematic structural diagram of a safety fuse for an electric vehicle charging facility according to an embodiment of the present application;
FIG. 2 is a schematic illustration of the safety fuse for an electric vehicle charging facility of FIG. 1 with a central hole housing removed;
FIG. 3 is a schematic view of the structure of FIG. 2 from another perspective;
Fig. 4 is a schematic diagram of an internal structure of a melt structure of a safety fuse for an electric vehicle charging facility according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a middle hole casing of a safety fuse for an electric vehicle charging facility according to an embodiment of the present application.
Reference numeral 1, a middle hole shell; 2, an end cover, 3, an electrode terminal, 4, a feedback hole, 5, a positioning convex strip, 6, an insulating protective sleeve, 7, a round copper sheet, 8, a contact copper sheet, 9, a metal telescopic rod, 10, a buffer spring, 11, a radiating fin, 12, a metal grid sheet, 13, a metal wire, 14, a trigger pin, 15, a connecting plate, 16, a spring, 17, a melt body, 18, a bimetal arc sheet and 19, a positioning clamping groove.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1 to 5, the embodiment of the application provides a safety fuse for an electric automobile charging facility, which comprises a shell structure, a melt structure and an elastic mounting piece, wherein the shell structure comprises a mesoporous shell 1, two ends of the mesoporous shell 1 are provided with detachable end covers 2 to form a containing cavity, the end covers 2 are in threaded connection with electrode terminals 3, the melt structure is detachably mounted in the containing cavity, the melt structure comprises a melt body 17, two ends of the melt body 17 in the length direction are both fixed with round copper sheets 7, a bimetal arc-shaped sheet 18 is arranged between the two round copper sheets 7 and is positioned on one side of the melt body 17, a fusing feedback assembly is arranged on the other side of the melt body 17, the elastic mounting piece is arranged on the outer sides of the two round copper sheets 7, and the outer ends of the elastic mounting piece are electrically connected with the electrode terminals 3.
It should be noted that the mesoporous shell 1 is made of an insulating high-temperature-resistant epoxy resin material, has good insulating performance and high-temperature resistance, can stably work in a high-temperature environment of an electric automobile charging facility, an O-shaped rubber ring is arranged at the screwed joint of the end cover 2 and the electrode terminal 3 to prevent dust and water from entering, the end cover 2 and the mesoporous shell 1 are fixedly connected through a plurality of fastening bolts to facilitate disassembly and replacement of a melt structure, the melt body 17 is of a rectangular sheet-shaped structure, is made of lead-tin alloy, the middle part of the melt body is a weak fusing area with gradually changed width, the weak area is fused preferentially when in overload, when abnormal conditions such as overload or short circuit occur in a circuit, the melt body 17 is fused due to heat generated by overlarge current, so that the circuit is cut off, the protection function is achieved, two circular copper sheets 7 are welded at two ends of the melt body 17 respectively, the bimetal arc sheets 18 are of iron-nickel alloy, the metal arc sheets close to the melt body 17 are of copper, when the circuit is continuously overloaded, the bimetal arc sheets 18 are bent and deform due to temperature rise, lateral pressure is applied to the melt body 17, so that the fuse-out time is shortened from the traditional fusing protection area to the pre-fusing structure of 60ms, and the triggering time of the conventional fusing structure is shortened to the triggering time of the pre-fusing structure of the fuse structure of 120ms is realized.
In the above scheme, through setting up detachable end cover 2 at mesopore casing 1 both ends, be convenient for dismantle shell structure, thereby dismantle and change fuse-element body 17, through the bimetal arc piece 18 of setting, when the circuit appears lasting overload, make bimetal arc piece 18 be heated and crooked, make the fuse area produce the microcrack in advance, reduce the response delay of fuse, do benefit to the frequent start and stop of quick charge stake, through the elastic mounting spare that sets up, when electric automobile receives vibration in the charging process, the elastic mounting spare buffers the shock attenuation to fuse-element body 17, avoid fuse-element body 17 and electrode terminal 3 to appear the disconnection phenomenon, prevent that the contact resistance of fuse-element body 17 and electrode terminal 3 from rising, through the fusing feedback subassembly that sets up, after fuse-element body 17 fuses, can make the fusing feedback subassembly part stretch out mesopore casing 1 for indicate and feedback maintainer, can in time change fuse-element body 17, guarantee the steady operation of charge stake.
In some possible embodiments, referring to fig. 2 and 3, the melt structure further comprises an insulation protection sleeve 6 sleeved on the melt body 17, and two ends of the insulation protection sleeve 6 respectively abut against the inner sides of the two circular copper sheets 7. The outer circumference of the insulating protective sleeve 6 is sleeved with a plurality of cooling fins 11 along the length direction thereof.
The insulating protective sleeve 6 is made of rubber, and the heat of the melt body 17 is led out through the mesoporous shell 1 by the plurality of radiating fins 11, so that the surface temperature of the fuse is less than or equal to 80 ℃.
In some possible embodiments, referring to fig. 2, 3 and 5, two positioning convex strips 5 are symmetrically arranged between two circular copper sheets 7, the positioning convex strips 5 are in a U-shaped structure, two ends of the U-shaped structure are respectively connected with two circular copper sheets 7, the radiating fins 11 are located inside the U-shaped structure, two positioning clamping grooves 19 are formed in two end faces inside the middle hole shell 1, and the two positioning convex strips 5 are respectively detachably arranged in the two positioning clamping grooves 19.
In the above-mentioned scheme, through the positioning slot 19 that sets up for two location sand strips 5 slidable set up in positioning slot 19, thereby fix a position the installation to the fuse-element structure, and the fuse-element structure is located and holds the intracavity, does not contact with mesopore casing 1 inner wall direct contact, has increased the radiating area to the fuse-element structure, has improved the radiating efficiency to the fuse-element structure.
In some possible embodiments, referring to fig. 1 to 5, the fusing feedback assembly comprises a metal wire 13 connected to the middle part of a melt body 17, one end of the metal wire 13, which faces away from the melt body 17, is connected with a trigger pin 14, a connecting plate 15 in sliding connection is sleeved on the trigger pin 14, four corners of the connecting plate 15 are fixed on the inner wall of the middle hole shell 1 through upright posts, a spring 16 is arranged between the inner wall of the middle hole shell 1 and the connecting plate 15, the spring 16 is sleeved on the trigger pin 14, two ends of the spring 16 are respectively fixedly arranged on the connecting plate 15 and the outer wall of the trigger pin 14, a feedback hole 4 coaxial with the trigger pin 14 is arranged on the middle hole shell 1, and the upper end of the trigger pin 14 is at least partially positioned in the feedback hole 4.
In the above scheme, under the effect of the spring 16, the upper end of the trigger pin 14 is normally located inside the feedback hole 4 and does not protrude out of the feedback hole 4, after the melt body 17 is fused, the metal wire 13 is reset along with the fusing, so as to drive the upper end of the trigger pin 14 to slide out upwards and protrude out of the feedback hole 4, and a red prompt cap convenient for observation can be arranged at the upper end of the trigger pin 14, so that maintenance personnel can conveniently judge the running state of the fuse, and the fuse can be inspected conveniently.
In some possible embodiments, as shown in fig. 3 and fig. 5, a plurality of metal grids 12 are disposed on the inner wall of the mesoporous shell 1 on the side facing away from the trigger pin 14, the metal grids 12 are thin copper sheets, and are mounted on the inner wall of the mesoporous shell 1 through an insulating bracket, the plurality of metal grids 12 are uniformly disposed along the length direction of the mesoporous shell 1, and the metal grids 12 are obliquely disposed.
In the above scheme, when the melt body 17 melts to generate an arc, the arc is sucked into the gap of the metal grid 12 under the action of a magnetic field (the grid itself is magnetically conductive) and divided into a plurality of short arcs, and the arc is rapidly extinguished within 10ms by utilizing the 'near-cathode effect' and the heat dissipation effect of the metal grid 12, so that the arc extinguishing efficiency is greatly improved compared with the traditional open structure.
In some possible embodiments, the inner side wall of the insulating protective sleeve 6 is coated with a gas-generating ceramic coating, the main component of the gas-generating ceramic coating is melamine cyanurate, inert gases such as N 2、CO2 and the like are generated by rapid decomposition at high temperature, the air pressure can reach 0.3MPa, the inert gases rapidly blow out the electric arc in the initial stage of electric arc generation, and the inert gases are matched with the metal grid 12 to form the composite arc extinction of 'gas blowing + grid', so that the energy of the electric arc is reduced, and the electric arc is prevented from burning the internal and external circuits of the mesoporous shell 1.
In some possible embodiments, as shown in fig. 2 and 3, the elastic mounting member includes a metal telescopic rod 9, one end of the metal telescopic rod 9 is electrically connected with the corresponding electrode terminal 3, the other end of the metal telescopic rod 9 is provided with a contact copper sheet 8, the contact copper sheet 8 is fixedly connected with the corresponding circular copper sheet 7, and a buffer spring 10 is sleeved between the contact copper sheet 8 and the metal telescopic rod 9.
In the above scheme, after installing the fuse-element structure, two contact copper sheets 8 respectively with two circular copper sheets 7 looks butt, extrusion buffer spring 10 for contact copper sheet 8 closely laminates with circular copper sheet 7 under the effect of elasticity, when producing the vibration, carries out buffering shock attenuation to the fuse-element structure, reduces the impact to the fuse-element structure, when dismantling, also can dismantle the fuse-element structure fast and change.
In some possible embodiments, as shown in fig. 1 to 3, an end of the electrode terminal 3 facing away from the end cap 2 is sleeved with an annular flange, on which a plurality of mounting holes are uniformly distributed, and the annular flange is mounted on a mounting plate of the charging device through countersunk bolts and the mounting holes.
In some possible embodiments, the outer surface of the electrode terminal 3 is subjected to silver plating or tin plating treatment, reducing the corrosion of the electrode terminal 3 from the environment.
The present embodiment is merely illustrative of the invention and is not intended to limit the invention, and those skilled in the art, after having read the present specification, may make modifications to the embodiment without creative contribution as required, but are protected by patent laws within the protection scope of the present invention.
Claims (10)
1. A safety fuse for an electric vehicle charging facility, comprising:
The shell structure comprises a middle hole shell (1), two ends of the middle hole shell (1) are provided with detachable end covers (2) to form a containing cavity, and the end covers (2) are in threaded connection with electrode terminals (3);
The melt structure is detachably arranged in the accommodating cavity and comprises a melt body (17), round copper sheets (7) are fixed at two ends of the melt body (17) in the length direction, a bimetal arc-shaped sheet (18) is arranged between the two round copper sheets (7) and positioned at one side of the melt body (17), and a fusing feedback assembly is arranged at the other side of the melt body (17);
The elastic mounting pieces are arranged on the outer sides of the two circular copper sheets (7), and the outer ends of the elastic mounting pieces are electrically connected with the electrode terminals (3).
2. The safety fuse for an electric vehicle charging facility according to claim 1, wherein the melt structure further comprises an insulation protection sleeve (6) sleeved on the melt body (17), and two ends of the insulation protection sleeve (6) are respectively abutted against inner sides of the two circular copper sheets (7).
3. The safety fuse for an electric vehicle charging facility according to claim 1 or 2, characterized in that the outer circumference of the insulating protective sheath (6) is fitted with a plurality of heat radiating fins (11) along its length direction.
4. The safety fuse for the electric automobile charging facility according to claim 3, wherein two positioning convex strips (5) are symmetrically arranged between two circular copper sheets (7), the positioning convex strips (5) are of a U-shaped structure, two ends of the U-shaped structure are respectively connected with the two circular copper sheets (7), and the radiating fins (11) are positioned on the inner side of the U-shaped structure;
positioning clamping grooves (19) are formed in the two end faces of the inner side of the middle hole shell (1), and the two positioning convex strips (5) are detachably arranged in the two positioning clamping grooves (19) respectively.
5. A safety fuse for an electric vehicle charging facility as claimed in claim 3, characterized in that the fuse feedback assembly comprises a wire (13) connected in the middle of a melt body (17);
One end of the metal wire (13) deviating from the melt body (17) is connected with a trigger pin (14);
The trigger pin (14) is sleeved with a connecting plate (15) in sliding connection, and four corners of the connecting plate (15) are fixed on the inner wall of the middle hole shell (1) through upright posts;
a spring (16) is arranged between the inner wall of the middle hole shell (1) and the connecting plate (15), the spring (16) is sleeved on the trigger pin (14), and two ends of the spring (16) are fixedly arranged on the connecting plate (15) and the outer wall of the trigger pin (14) respectively;
the middle hole shell (1) is provided with a feedback hole (4) coaxial with the trigger pin (14), and the upper end of the trigger pin (14) is at least partially positioned in the feedback hole (4).
6. The safety fuse for an electric vehicle charging facility according to claim 5, wherein a plurality of metal grid plates (12) are provided on an inner wall of the middle hole housing (1) on a side facing away from the trigger pin (14), the plurality of metal grid plates (12) are uniformly provided along a length direction of the middle hole housing (1), and the metal grid plates (12) are obliquely provided.
7. A safety fuse for an electric vehicle charging installation as claimed in claim 3, characterized in that the inner side wall of the insulating protective sleeve (6) is coated with a gas-generating ceramic coating.
8. The safety fuse for an electric automobile charging facility according to claim 4, wherein the elastic mounting piece comprises a metal telescopic rod (9), one end of the metal telescopic rod (9) is electrically connected with the corresponding electrode terminal (3), the other end of the metal telescopic rod (9) is provided with a contact copper sheet (8), the contact copper sheet (8) is fixedly connected with the corresponding round copper sheet (7), and a buffer spring (10) is sleeved between the contact copper sheet (8) and the metal telescopic rod (9).
9. The safety fuse for an electric vehicle charging facility according to claim 8, wherein an annular flange is sleeved at one end of the electrode terminal (3) away from the end cover (2), a plurality of mounting holes are uniformly distributed in the annular flange, and the annular flange is mounted on a mounting plate of the charging device through countersunk bolts and the mounting holes.
10. The safety fuse for an electric vehicle charging facility according to claim 9, characterized in that the outer surface of the electrode terminal (3) is silver-plated or tin-plated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510721273.3A CN120376385A (en) | 2025-05-30 | 2025-05-30 | Safety fuse for electric automobile charging facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510721273.3A CN120376385A (en) | 2025-05-30 | 2025-05-30 | Safety fuse for electric automobile charging facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN120376385A true CN120376385A (en) | 2025-07-25 |
Family
ID=96440790
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202510721273.3A Pending CN120376385A (en) | 2025-05-30 | 2025-05-30 | Safety fuse for electric automobile charging facility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN120376385A (en) |
-
2025
- 2025-05-30 CN CN202510721273.3A patent/CN120376385A/en active Pending
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