HIGH-VOLTAGE DIRECT-CURRENT THERMAL FUSE

• US 20200135422A1
• Filed: 08/22/2018
• Published: 04/30/2020
• Est. Priority Date: 06/30/2017
• Status: Active Grant

• Current Assignee: Xiamen Set Electronics Company Limited
• Original Assignee: Xiamen Set Electronics Company Limited
• Inventors: HONG, Yaoxiang
• Granted Patent: US 11,049,683 B2
• Time in Patent Office: Days
• CPC Class Codes: H01H 37/761 with a fusible element forming part of the switched circuit H01H37/767 takes precedence
• CPC Class Codes: H01H 85/12 Two or more separate fusible members in parallel
• CPC Class Codes: H01H 85/165 Casings
• CPC Class Codes: H01H 85/38 Means for extinguishing or suppressing arc by powder filling H01H85/18; by mechanical tension applied to fusible member H01H85/36

Abstract

A high-voltage direct-current thermal fuse including: a fusible component having two fusible alloy support arms parallel to each other; a fluxing agent; a fusing cavity; and two pins. The fusible component and the fluxing agent are sealed within the fusing cavity. The two pins are respectively connected to the two support arms. Technically, the fluxing agent only needs to have contact with the fusible alloy. Practically, the fluxing agent is usually coated over the fusible alloy. The fusible component in the high-voltage direct-current thermal fuse of the present application is a U-shaped structure having two parallel support arms. A high electric field intensity is generated when an arc is being cut off, as a result, the electrons repel each other, and the arc is lengthened, thereby increasing the speed of cutting off the arc.

Claims

1. A high-voltage direct-current thermal fuse, comprising:

a fusible component having fusible alloy support arms, wherein the fusible alloy support arms do not intersect;

a fluxing agent;

a fusing cavity, wherein the fusible component and the fluxing agent are sealed within the fusing cavity; and

pins, wherein the pins are respectively connected to the fusible alloy support arms.

2. The high-voltage direct-current thermal fuse according to claim 1, wherein the fusible component has a U-shaped, M-shaped, S-shaped or trapezoid-shaped structure;

a number of the fusible alloy support arms is two, and a number of the pins is two;

the two fusible alloy support arms and the two pins are connected in a one-to-one correspondence manner.

3. The high-voltage direct-current thermal fuse according to claim 1, further comprising an insulation block, wherein the insulation block is arranged between the two fusible alloy support arms and separates the two pins.

4. The high-voltage direct-current thermal fuse according to claim 3, further comprising a housing and a bottom plate;

wherein the insulation block is arranged on the bottom plate;

the housing, the bottom plate, the insulation block, and the two pins form the fusing cavity.

5. The high-voltage direct-current thermal fuse according to claim 1, wherein a fusible alloy connection segment is connected between the two fusible alloy support arms.

6. The high-voltage direct-current thermal fuse according to claim 1, wherein n conductive members and n−

1 fusible alloy connection segments arranged at intervals are connected between the two fusible alloy support arms, and n is a natural number;

when n is greater than or equal to 2, each fusible alloy connection segment is arranged between two conductive members.

7. The high-voltage direct-current thermal fuse according to claim 6, wherein one conductive member is connected between the two fusible alloy support arms.

8. The high-voltage direct-current thermal fuse according to claim 6, wherein two conductive members and one fusible alloy connection segment arranged between the two conductive members are connected between the two fusible alloy support arms.

9. The high-voltage direct-current thermal fuse according to claim 6, wherein when n is greater than or equal to 3, cross-sectional areas of the fusible alloy connection segments differ from one another, and an operating temperature of the fusible alloy connection segment having a smaller cross-sectional area is higher than an operating temperature of the fusible alloy connection segment having a larger cross-sectional area.

10. The high-voltage direct-current thermal fuse according to claim 6, wherein a place at which the fusible alloy support arms, the fusible alloy connection segment, and the conductive member are connected is provided with connection holes.

11. The high-voltage direct-current thermal fuse according to claim 1, wherein the two pins are perpendicular to the fusible alloy support arms.

12. The high-voltage direct-current thermal fuse according to claim 1, wherein a non-metallic partition film is arranged inside the fusing cavity to divide the fusing cavity into an inner cavity and an outer cavity, and the inner cavity and the outer cavity are mutually sealed;

the fluxing agent is arranged inside the inner cavity, and a quartz sand is arranged inside the outer cavity.

13. The high-voltage direct-current thermal fuse according to claim 1, further comprising a plurality fusible components connected in parallel.

14. The high-voltage direct-current thermal fuse according to claim 13, wherein conductive members having equal electric potential in the plurality of fusible components connected in parallel are integrated into one body.

15. The high-voltage direct-current thermal fuse according to claim 1, wherein the fusible component has a hollow tube structure, and the fluxing agent is placed inside the tube.

16. The high-voltage direct-current thermal fuse according to claim 1, wherein an external connection part of each pin is wavy at a side near the fusing cavity and is flat at a side away from the fusing cavity.

17. The high-voltage direct-current thermal fuse according to claim 2, further comprising an insulation block, wherein the insulation block is arranged between the two fusible alloy support arms and separates the two pins.

18. The high-voltage direct-current thermal fuse according to claim 2, wherein a fusible alloy connection segment is connected between the two fusible alloy support arms.

19. The high-voltage direct-current thermal fuse according to claim 2, wherein n conductive members and n−

1 fusible alloy connection segments arranged at intervals are connected between the two fusible alloy support arms, and n is a natural number;

when n is greater than or equal to 2, each fusible alloy connection segment is arranged between two conductive members.

20. The high-voltage direct-current thermal fuse according to claim 2, wherein the two pins are perpendicular to the fusible alloy support arms.