High voltage miniature circuit breaker

Abstract

The utility model relates to a kind of high-voltage miniature circuit breaker, including shell and the operating mechanism, static contact, arc extinguishing cover being set in the shell, operating mechanism is provided with moving contact, moving contact is provided with fulcrum hinged on shell, operating mechanism is connected in the middle section of moving contact by contact push rod and connecting piece, since the distance of connecting point of connecting piece to fulcrum is less than the distance of contact part to fulcrum, the movement distance of contact part of moving contact is amplified by lever action of moving contact, the movement distance of contact part of moving contact is greater than the lower end moving distance of contact push rod in operating mechanism, the breaking distance of moving contact is improved without changing operating mechanism, realize big opening distance.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical equipment, specifically a high-voltage miniature circuit breaker. Background Technology

[0002] Miniature circuit breakers, also known as micro circuit breakers, are mainly used in various places such as industrial, commercial, high-rise and residential buildings. They can be used for overload and short circuit protection of lines, and can also be used for infrequent operation switching of lines under normal conditions.

[0003] To meet the high voltage requirements of the new energy sector, miniature circuit breakers need to improve their breaking distance and arc extinguishing capability. However, due to the compact design of miniature circuit breakers, existing miniature circuit breakers have small breaking distances, small arc extinguishing chamber volumes, and few arc extinguishing grids, making it difficult to achieve high voltage breaking. Summary of the Invention

[0004] To address the aforementioned shortcomings, this utility model provides a small-sized, large-aperture high-voltage miniature circuit breaker.

[0005] To achieve the above objectives, this utility model employs a high-voltage miniature circuit breaker, comprising a housing and an operating mechanism, a stationary contact, and an arc-extinguishing shroud disposed within the housing. The operating mechanism is equipped with a moving contact, which, along with the stationary contact, is positioned at the front end of the arc-extinguishing shroud for breaking and closing. One end of the moving contact forms a fulcrum hinged to the housing, and the other end forms a contact portion for contacting the stationary contact. The operating mechanism includes a contact support, a contact push rod, and a connecting piece. The upper end of the contact push rod is connected to the contact support, and the lower end of the contact push rod is connected to one end of the connecting piece. The other end of the connecting piece is connected to the middle section of the moving contact, pushing the moving contact to swing between the breaking and closing positions around the fulcrum. The swing distance of the contact portion of the moving contact is longer than the movement distance of the lower end of the contact push rod.

[0006] This invention features a fulcrum hinged to the housing on the moving contact. The operating mechanism is connected to the middle section of the moving contact via a contact push rod and a connecting piece. Since the distance from the connection point of the connecting piece to the fulcrum is less than the distance from the contact part to the fulcrum, the lever effect of the moving contact amplifies the movement distance of the contact part of the moving contact, making the movement distance of the contact part of the moving contact greater than the movement distance of the lower end of the contact push rod in the operating mechanism. This increases the breaking distance of the moving contact without changing the operating mechanism, achieving a large opening distance.

[0007] Specifically, the contact push rod is hinged to the contact support, and a contact spring is provided between the contact support and the contact push rod. The contact spring pushes the contact push rod toward the stationary contact.

[0008] The above technical solution uses a contact spring to provide pressure to the contact push rod, ensuring that the contact push rod can push the moving contact to connect tightly with the stationary contact.

[0009] Specifically, the stationary contact is obliquely outward relative to the moving contact, and the moving contact and the stationary contact form an "eight" shape when separated. The distance between the contact portions of the stationary contact and the moving contact is greater than the swing distance of the contact push rod.

[0010] The above technical solution increases the breaking distance between the moving contact and the stationary contact by setting the stationary contact at an angle.

[0011] Specifically, the arc-extinguishing shroud is disposed below the moving contact and the stationary contact, with the opening of the arc-extinguishing shroud facing upwards. The moving contact moves within the opening of the arc-extinguishing shroud, and a moving arc-inducing plate is disposed on the outside of the moving contact at the breaking position. The moving arc-inducing plate extends to one end of the arc-extinguishing shroud, and a stationary arc-inducing plate extending to the other end of the arc-extinguishing shroud is connected to the top of the stationary contact.

[0012] In the above technical solution, the arc extinguishing chamber is arranged horizontally to accommodate the movement of the moving contact within its opening. A stationary arc-inducing plate and a moving arc-inducing plate are respectively installed on the stationary and moving contacts to accelerate the interruption of the arc and allow it to enter the arc extinguishing chamber, thereby improving the arc extinguishing capability.

[0013] Specifically, a protrusion is formed on the shell below the arc extinguishing hood, and the outer side of the arc extinguishing hood abuts against the protrusion, so that a venting channel is formed between the lower edge of the arc extinguishing hood and the shell. Vents are formed at both ends of the venting channel, and vents are formed on the shell outside the vents.

[0014] The above technical solution retains an arc venting channel on the outside of the arc extinguishing chamber. The exhaust gas generated by extinguishing the electric arc is discharged from the vents at both ends through the arc venting channel, preventing the high-temperature exhaust gas from accumulating inside the shell.

[0015] Specifically, the stationary contact head has an integrally formed terminal block, the terminal block is provided with a magnetic yoke, an armature is hinged to the magnetic yoke, and the top of the armature is linked to the operating mechanism.

[0016] The above technical solution uses a magnetic yoke and an armature to form an overcurrent trip unit, thereby achieving overcurrent protection in high-voltage environments.

[0017] Specifically, a partition is provided between the moving contact and the terminal block in the housing. The partition is disposed close to the terminal block, and its upper end extends above the fulcrum of the moving contact. In the above technical solution, a partition is used to isolate the moving contact from the terminal block, preventing short circuits.

[0018] Specifically, the lower end of the contact support has symmetrical push rod connecting parts on both sides, and the upper end of the contact push rod has two contact connecting pieces, which are respectively hinged in the push rod connecting parts.

[0019] Specifically, the lower end of the contact push rod forms two connecting ends, and there are two connecting pieces. One end of the two connecting pieces is hinged to the two connecting ends, and the other end is hinged to both sides of the moving contact. The connecting pieces are in an upwardly curved arc shape.

[0020] Specifically, the contact spring is a double torsion spring structure, with the middle part of the contact spring connected to the contact support, and the two ends of the contact spring hooked to the outside of the contact connecting piece. Attached Figure Description

[0021] Figure 1 This is a front view of a specific embodiment of the present invention with one side of the shell removed.

[0022] Figure 2 This is a three-dimensional schematic diagram of a specific embodiment of the present invention with one side of the shell removed.

[0023] Figure 3 This is a front view of a specific embodiment of the present invention with one side of the shell and the arc-extinguishing cover removed.

[0024] Figure 4 This is a schematic diagram of the operating mechanism of a specific embodiment of this utility model.

[0025] Figure 5 This is an exploded view of the operating mechanism of a specific embodiment of this utility model. Detailed Implementation

[0026] like Figures 1-5 As shown, a specific embodiment of this utility model is a high-voltage miniature circuit breaker, including a housing 1 and an operating mechanism 2, a stationary contact 3, and an arc-extinguishing cover 4 disposed within the housing 1. The operating mechanism 2 is provided with a moving contact 5, which is positioned at the front end of the arc-extinguishing cover 4 to separate and close the circuit. One end of the moving contact 5 forms a fulcrum 51 hinged to the housing 1, and the other end forms a contact portion 52 for contacting the stationary contact 3. The operating mechanism 2 includes a contact support 21 and a contact push rod 22. The upper end of the connecting piece 23 and the contact push rod 22 is hinged to the contact support 21. A contact spring 24 is provided between the contact support 21 and the contact push rod 22. The contact spring 24 pushes the contact push rod 22 toward the stationary contact 3. The lower end of the contact push rod 22 is connected to one end of the connecting piece 23. The other end of the connecting piece 23 is connected to the middle section of the moving contact 5, which pushes the moving contact 5 to swing around the fulcrum 51 between the open and closed positions. The swing distance of the contact part 52 of the moving contact 5 is longer than the movement distance of the lower end of the contact push rod 22.

[0027] The lower end of the contact support 21 forms symmetrical push rod connecting parts 211 on both sides. The upper end of the contact push rod 22 forms two contact connecting pieces 221, which are respectively hinged within the push rod connecting parts 211. The lower end of the contact push rod 22 forms two connecting ends 222. There are two connecting pieces 23. One end of the two connecting pieces 23 is hinged to the two connecting ends 222, and the other end of the connecting pieces 23 is hinged to both sides of the moving contact 5. The connecting pieces 23 are in an upwardly curved arc shape.

[0028] The contact spring 24 is a double torsion spring structure. The middle part of the contact spring 24 is connected to the contact support 21, and the two ends of the contact spring 24 are hooked to the outside of the contact connecting piece 221.

[0029] The stationary contact 3 is obliquely outward relative to the moving contact 5. When the moving contact 5 and the stationary contact 3 are separated, they form an "eight" shape. The distance between the contact portion 52 of the stationary contact 3 and the moving contact 5 is greater than the swing distance of the contact push rod 22.

[0030] An arc-extinguishing shroud 4 is positioned below the moving contact 5 and the stationary contact 3, with the opening of the shroud 4 facing upwards. The moving contact 5 moves within the opening of the arc-extinguishing shroud 4. A moving arc-inducing plate 53 is provided on the outer side of the moving contact 5 at the breaking position, extending to one end of the arc-extinguishing shroud 4. The top of the stationary contact 3 is connected to a stationary arc-inducing plate 31 extending to the other end of the arc-extinguishing shroud 4. A protrusion 11 is formed on the housing 1 below the arc-extinguishing shroud 4. The outer side of the arc-extinguishing shroud 4 abuts against the protrusion 11, forming a venting channel 12 between the arc-extinguishing shroud 4 and the lower edge of the housing 1. Vents 13 are formed at both ends of the venting channel 12, and vents 14 are formed on the housing 1 outside the vents 13.

[0031] A terminal block 32 is integrally formed on the stationary contact 3. A magnetic yoke 33 is provided on the terminal block 32. An armature 34 is hinged on the magnetic yoke 33. The top of the armature 34 is linked to the latch of the operating mechanism 2.

[0032] The housing 1 has a partition 15 between the moving contact 5 and the terminal block 32. The partition 15 is set close to the terminal block 32 above the stationary contact 3, and the upper end of the partition 15 extends above the fulcrum 51 of the moving contact 5.

[0033] The preferred embodiments of the present invention described above, especially the operating mechanism shown in the accompanying drawings of the specific embodiments of the present invention, may employ other common miniature circuit breaker operating mechanisms, such as C45, DZ47, and L7. These miniature circuit breaker operating mechanisms, as well as other obvious variations or combinations, are also within the scope of protection of the claims.

Claims

1. A high-voltage miniature circuit breaker, comprising a housing and an operating mechanism, a stationary contact, and an arc-extinguishing chamber disposed within the housing, wherein a moving contact is disposed on the operating mechanism, and the moving contact and the stationary contact are disposed at the front end of the arc-extinguishing chamber for breaking and closing, characterized in that: One end of the moving contact forms a fulcrum hinged to the housing, and the other end of the moving contact forms a contact portion for contacting the stationary contact. The operating mechanism includes a contact support, a contact push rod, and a connecting piece. The upper end of the contact push rod is connected to the contact support, and the lower end of the contact push rod is connected to one end of the connecting piece. The other end of the connecting piece is connected to the middle section of the moving contact, which pushes the moving contact to swing around the fulcrum between the open and closed positions. The swing distance of the contact portion of the moving contact is longer than the movement distance of the lower end of the contact push rod.

2. The high-voltage miniature circuit breaker according to claim 1, characterized in that: The contact push rod is hinged to the contact support, and a contact spring is provided between the contact support and the contact push rod. The contact spring pushes the contact push rod toward the stationary contact.

3. The high-voltage miniature circuit breaker according to claim 1 or 2, characterized in that: The stationary contact is obliquely outward relative to the moving contact. When the moving contact and the stationary contact are separated, they form an "eight" shape. The distance between the contact portions of the stationary contact and the moving contact is greater than the swing distance of the contact push rod.

4. The high-voltage miniature circuit breaker according to claim 3, characterized in that: The arc-extinguishing shroud is disposed below the moving contact and the stationary contact, with the opening of the arc-extinguishing shroud facing upward. The moving contact moves within the opening of the arc-extinguishing shroud. A moving arc-inducing plate is disposed on the outside of the moving contact at the breaking position. The moving arc-inducing plate extends to one end of the arc-extinguishing shroud. The top of the stationary contact is connected to a stationary arc-inducing plate extending to the other end of the arc-extinguishing shroud.

5. The high-voltage miniature circuit breaker according to claim 4, characterized in that: A protrusion is formed on the shell below the arc extinguishing hood, and the outer side of the arc extinguishing hood abuts against the protrusion, so that a venting channel is formed between the lower edge of the arc extinguishing hood and the shell. Vents are formed at both ends of the venting channel, and vents are formed on the shell outside the vents.

6. The high-voltage miniature circuit breaker according to claim 3, characterized in that: The stationary contact head has an integrally formed terminal block, the terminal block is provided with a magnetic yoke, an armature is hinged to the magnetic yoke, and the top of the armature is linked to the operating mechanism.

7. The high-voltage miniature circuit breaker according to claim 6, characterized in that: The housing has a partition between the moving contact and the terminal block, the partition being disposed close to the terminal block, and the upper end of the partition extending above the fulcrum of the moving contact.

8. The high-voltage miniature circuit breaker according to claim 2, characterized in that: The lower end of the contact support forms symmetrical push rod connecting parts on both sides, and the upper end of the contact push rod forms two contact connecting pieces, which are respectively hinged in the push rod connecting parts.

9. The high-voltage miniature circuit breaker according to claim 8, characterized in that: The lower end of the contact push rod forms two connecting ends. There are two connecting pieces. One end of the two connecting pieces is hinged to the two connecting ends, and the other end is hinged to both sides of the moving contact. The connecting pieces are in an upwardly curved arc shape.

10. The high-voltage miniature circuit breaker according to claim 8, characterized in that: The contact spring is a double torsion spring structure. The middle part of the contact spring is connected to the contact support, and the two ends of the contact spring are hooked to the outside of the contact connecting piece.

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