Circuit breaker capable of rapidly extinguishing arc

Abstract

The utility model relates to a circuit breaker capable of rapidly extinguishing an arc, which comprises a shell formed by a first shell and a second shell, and a middle cover arranged between the first shell and the second shell, and further comprises a wiring assembly, a handle; the operating mechanism is arranged in the first cavity, and the two moving contacts partially extend into the second cavity and the third cavity respectively; the two arc extinguishing systems are arranged in the second cavity and the third cavity respectively, the front ends of the arc extinguishing systems are provided with static contact assemblies corresponding to the moving contacts, the lower ends of the two arc extinguishing systems are provided with end tabs, and the end tabs extend from the bottoms of the arc extinguishing systems to the bottoms of the moving contacts at the maximum opening distance. An arc blocking sheet which is in linkage with the moving contact is arranged between the moving contact and the contact support, and the arc blocking sheet is located above the moving path of the moving contact. The arc blocking sheet completely seals the upper space of the opening and closing area of the moving contact and the static contact, so that the air pressure in the contact space can be rapidly increased during opening, the electric arc can be rapidly transferred into an arc running channel formed by the run-on plates under the action of air blowing, the distance between the arc running channels is reduced, the magnetic field intensity of the arc running channel is also enhanced, and the service life of the arc running channel is prolonged. And when the contact is broken, the electric arc is easily transferred from the contact to the arc running channel, so that the service life of the contact is prolonged.

Description

Technical Field

[0001] The utility model relates to the field of low-voltage electrical appliances, in particular to a circuit breaker capable of quickly extinguishing arcs. Background Art

[0002] Miniature circuit breakers are terminal equipment for power distribution lines. They are small in size and modular, and are mainly used to protect lines. They are widely used for terminal power distribution in homes, office buildings, shopping malls, communication base stations, and rural outdoor power distribution. At present, when traditional miniature circuit breakers on the market are manually closed, the closing speed of the moving contact varies with the speed of the hand push, which can easily cause arcing between the moving contact and the static contact, thereby affecting the service life of the contact.

[0003] In the field of low-voltage circuit breaker technology, improving short-circuit breaking capacity has always been a difficult problem. For traditional circuit breakers, if the breaking capacity is improved by only making partial changes to the structure, the current limiting capacity can be increased by increasing the opening distance of the circuit breaker, that is, increasing the arc length and increasing the arc resistance, thereby achieving the purpose of improving the circuit breaker's breaking capacity. However, the development trend of circuit breakers is increasingly tending towards miniaturization and compactness. How to improve the breaking capacity while the size of the circuit breaker is decreasing has become a hot topic and key issue in research. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model aims to provide a circuit breaker capable of quickly extinguishing arcs.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A circuit breaker capable of rapid arc extinguishing, comprising a housing composed of a first housing and a second housing, wherein a first chamber is provided in the housing, and a middle cover is provided between the first housing and the second housing, wherein the middle cover partially separates the first chamber into a second chamber and a third chamber, and further comprising:

[0007] Wiring components are arranged at both ends of the housing;

[0008] A handle rotatably disposed in the first chamber of the housing;

[0009] An operating mechanism is disposed in the first chamber and is linked with the handle, and includes a contact support and two side-by-side moving contacts linked with the contact support, and the two moving contacts are partially extended into the second chamber and the third chamber respectively;

[0010] Two arc extinguishing systems are respectively placed in the second chamber and the third chamber, and the front end of the arc extinguishing system is provided with a static contact assembly corresponding to the moving contact.

[0011] Arc starting plates are provided at the lower ends of both arc extinguishing systems. The arc starting plates extend from the bottom of the arc extinguishing systems to the bottom of the moving contact at the maximum open distance. A arc blocking piece is arranged between the moving contact and the contact support and is linked with the moving contact. The arc blocking piece is located above the movement path of the moving contact.

[0012] The moving contact is fixedly arranged on the contact support through a moving contact holder.

[0013] Two moving contacts are arranged side by side, and their bottoms are connected together through a connecting part. The connecting part is rotatably arranged on the moving contact holder through a connecting shaft, and the connecting shaft is arranged perpendicular to the rotating shaft of the operating mechanism.

[0014] The arc blocking piece is arranged between the moving contact holder and the moving contact.

[0015] A limiting support is arranged above the arc blocking piece on any side of the housing.

[0016] A lower piece for isolating and connecting the wiring component and the static contact piece of the static contact is arranged on one side of the middle cover.

[0017] A limiting support is arranged on one side of the lower piece.

[0018] The lock catch includes a round hole for serving as a rotation center, a fan-shaped body distributed in a fan shape with the round hole as the center, and a lapping part extending from the other side of the round hole and forming a lapping fit with the jump catch. A cavity is formed between the fan-shaped body and the contact support, and a lock catch return spring is arranged in the cavity.

[0019] A bimetallic strip is further arranged in the first chamber. The bimetallic strip is located at the rear end of the moving contact placed in the second chamber. A guiding groove is arranged between the middle cover and the second housing. A pull rod is arranged in the guiding groove. The rear end of the pull rod is placed behind the bimetallic strip, and the front end of the pull rod is linked with the operating mechanism.

[0020] A hook part is arranged at the lower end of the lock catch, and the hook part is placed behind the front end of the pull rod.

[0021] The beneficial effects of the utility model are as follows: The arc blocking piece completely encloses the upper space of the opening and closing area of the moving contact and the static contact. During opening, it can quickly increase the air pressure in the contact space. Under the action of air blowing, the arc quickly enters the arc running channel formed by the arc starting plate, and the arc quickly moves from the arc running channel to the arc extinguishing chamber, reducing the distance between the arc running channels and also enhancing the magnetic field strength of the arc running channels. When the contacts are disconnected, the arc is easily transferred from the contacts to the arc running channels, thereby prolonging the service life of the contacts. Description of the Drawings

[0022] Figure 1 It is an exploded schematic view of the housing of the utility model.

[0023] Figure 2 This is a schematic structural view of one inner side (the arc extinguishing system is not shown) of the present utility model.

[0024] Figure 3 This is a schematic structural view of the other inner side (the arc extinguishing system is not shown) of the present utility model.

[0025] Figure 4 This is a schematic sectional view at the arc blocking piece of the present utility model.

[0026] Figure 5 This is a schematic structural view of the operating mechanism of the present utility model.

[0027] Figure 6 This is a schematic structural view of the cooperation of the operating mechanism, static contact and arc ignition plate of the present utility model.

[0028] Figure 7 This is a partial exploded view of the operating mechanism of the present utility model.

[0029] Figure 8 This is a schematic structural view of the middle cover of the present utility model.

[0030] Figure 9 This is a schematic structural view of the lock catch of the present utility model. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0033] Such as Figure 1 、 Figure 2 And Figure 3As shown, the present application discloses a circuit breaker capable of rapid arc extinguishing, which includes a housing composed of a first housing 10 and a second housing 20, wherein a first chamber 12 is arranged in the housing, and a middle cover 30 is arranged between the first housing 10 and the second housing 20, wherein the middle cover 30 partially separates the first chamber 12 into a second chamber 13 and a third chamber 14, and wiring assemblies are arranged at both ends of the housing, respectively, and the wiring assemblies are wiring terminals, each of which has one at each end, and one of them is placed in a cavity composed of the middle cover and the partition 34, and the cavity is connected to the second cavity, and the other is fixed in the cavity composed of the first housing and the second housing, and the wiring assemblies are arranged at both ends of the housing, respectively. The cavity is connected to the first cavity, and an electromagnetic release 700 is also provided in the second cavity. The wiring terminal located between the middle cover and the second shell is directly connected to the electrical coil of the electromagnetic release, and the other end of the coil of the electromagnetic release is connected to the static contact. The arc extinguishing system is an arc extinguishing chamber, which is two and is respectively located in the second cavity and the third cavity, and is located below the electromagnetic release. The static contact is arranged above the front end of the arc extinguishing chamber, and an arc striking plate is arranged below it, and the moving contact under the arc striking plate extends to form an arc runway. The operating mechanism and the handle are arranged in the first cavity, so that the handle can drive the operating mechanism to perform opening and closing operations.

[0034] The wiring assembly 100 is disposed at both ends of the housing, and the wiring assembly is a wiring terminal for external wiring.

[0035] The handle 200 is rotatably disposed in the first chamber 12 of the housing, and is linked to the operating mechanism via a U-shaped connecting rod. The handle can drive the operating mechanism to move via the U-shaped connecting rod.

[0036] like Figure 2 , Figure 3 and Figure 5 As shown, the operating mechanism 300 is arranged in the first chamber 12 and is linked with the handle 200. It includes a contact support 330 and two side-by-side moving contacts 340 linked with the contact support 330, and the two moving contacts 340 are partially extended into the second chamber 13 and the third chamber 14 respectively, that is, the present application adopts a double moving and static contact design, which drives the two moving contacts to open and close relative to the static contact through an operating mechanism.

[0037] Two arc extinguishing systems, the arc extinguishing system is a conventional arc extinguishing chamber (not shown in the drawings), which is respectively placed in the second chamber 13 and the third chamber 14, and the front end of the arc extinguishing system is provided with a static contact assembly 600 arranged corresponding to the moving contact 340, and the bottom of the static contact assembly is also welded and fixed by a first arc-starting plate, which extends to the top of the arc extinguishing chamber.

[0038] like Figure 6As shown in the figure, arc ignition plates 500 are provided at the lower ends of both arc extinguishing systems. The arc ignition plates 500 extend from the bottom of the arc extinguishing systems to the bottom of the moving contact 340 at the maximum opening distance, so as to meet the arc ignition requirements of the moving contact at the maximum repulsive opening distance. A arc blocking piece 350 linked with the moving contact 340 is arranged between the moving contact 340 and the contact support 330, and the arc blocking piece 350 is located above the movement path of the moving contact 340.

[0039] The design of this arc blocking piece can block the space above the opening and closing area of the static and moving contacts. The arcs generated during the breaking process are blocked by the arc blocking piece, which can prevent the arcs from moving upward and entering the first chamber.

[0040] The front end of the arc blocking piece has a circular arc transition and is adapted to the upper end of the static contact, which can avoid possible interference during the closing process.

[0041] As Figure 7 shown in the figure, the moving contact 340 is fixedly arranged on the contact support 330 through a moving contact holder 370. Two moving contacts 340 are arranged side by side, and their bottoms are connected together through a connecting part. The connecting part is rotatably arranged on the moving contact holder 370 through a connecting shaft, and the connecting shaft is perpendicular to the rotating shaft of the operating mechanism 300.

[0042] In this way, the two moving contacts have the effect of rotating around the connecting shaft, so as to ensure that even when the sizes of the moving contact and / or the static contact are inconsistent, the moving contact can respectively make reliable contact with the static contact, realizing automatic compensation for the size difference of the double contacts.

[0043] The connecting shaft can be a rivet, and the double moving contact assembly is directly fixed on the moving contact holder by riveting, and it can rotate relative to the rivet.

[0044] The arc blocking piece 350 is arranged between the moving contact holder 370 and the moving contact. The direct contact area between the moving contact holder and the moving contact is large, and the friction force is large. Sometimes the moving contact cannot rotate flexibly, resulting in poor contact synchronization. By adding the arc blocking piece, the rotation friction force of the moving contact becomes smaller. After closing and opening, the automatic adjustment of the synchronization of the two pairs of contacts can be realized. One end of the arc blocking piece is set as a connecting part with a round hole. The moving contact holder, the moving contact and the connecting part are connected, that is, the rivet passes through the round hole of the moving contact and the connecting part in turn and is connected with the moving contact holder, and the cooperation between the two is used to fix the arc blocking piece.

[0045] A limiting support 32 is provided on any side of the housing and is arranged above the arc-blocking piece 350. The limiting support is a boss structure and can be directly formed on the side wall of the housing. The arc-blocking surface of the arc-blocking piece is limited and supported by the limiting support, so that the air pressure in the contact space is rapidly increased, and the arc is rapidly transferred into the arc path under the action of air blowing. Figure 4 As shown, the limiting support member 32 is located above the arc baffle plate. When the arc baffle surface below the arc baffle plate is subjected to an upward impact force, its upper side is limited by the limiting support member and can withstand a larger impact force, thereby rapidly increasing the internal air pressure.

[0046] The arc-starting plates are two parallel structures connected at one end. They are made of copper to enhance the magnetic field strength of the arc track, allowing the arc to quickly move from the arc track to the arc extinguishing chamber. Reducing the distance between the arc tracks also enhances the magnetic field strength of the arc track. When the contacts are disconnected, the arc is easily transferred from the contacts to the arc track, thereby extending the service life of the contacts.

[0047] like Figure 8 As shown, a lower sheet 31 for isolating a static contact sheet 610 connecting the wiring assembly and the static contact is provided on one side of the middle cover, and the lower sheet directly isolates the static contact sheet 610. The static contact sheet can be directly extended from the static contact to the wiring terminal, thereby improving the insulation performance between the moving contact and the static contact sheet. At the same time, the edge of the lower sheet is raised to form a wrapping portion, thereby further improving the creepage distance.

[0048] In the present application, the limiting support member 32 may be disposed on one side of the lower plate 31 to limit and support the upper side of the arc-blocking plate.

[0049] like Figure 9 As shown, the lock 310 includes a circular hole 311 used as a rotation center, a fan-shaped body 312 distributed in a fan shape with the circular hole 311 as the center, and a lap joint 313 extending from the other side of the circular hole to form an lap joint with the jump buckle, and a cavity is formed between the fan-shaped body and the contact support, and a lock reset spring 360 is provided in the cavity. The mountain-shaped body closes the entire cavity to achieve insulation in the cavity, which can prevent arc from entering and burning the lock reset spring 360.

[0050] A double gold sheet 400 is also provided in the first chamber, and the double gold sheet 400 is located at the rear end of the moving contact placed in the second chamber, and a guide groove 33 is provided between the middle cover and the second shell body, and a pull rod 410 is provided in the guide groove 33, and the rear end of the pull rod 410 is placed behind the double gold sheet 400, and the front end of the pull rod 410 is linked to the operating mechanism. The design of the guide groove of the middle cover can realize the support and fixation of the pull rod, and also guide and limit it, thereby ensuring that the action of the double gold sheet can act on the operating mechanism more accurately.

[0051] The lower end of the latch 310 is provided with a hook portion 314, and the hook portion 314 is placed behind the front end of the pull rod 410. The pull rod can directly pull the latch through the hook portion to perform an unlocking action.

[0052] The embodiments should not be regarded as limitations of the present invention, but any improvements based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A circuit breaker capable of quickly extinguishing arcs, characterized in that: The invention comprises a shell composed of a first shell (10) and a second shell (20), wherein a first chamber (12) is provided in the shell, and a middle cover (30) is provided between the first shell (10) and the second shell (20), wherein the middle cover (30) partially separates the first chamber (12) into a second chamber (13) and a third chamber (14), and further comprises: A wiring assembly (100) is arranged at two ends of the housing; A handle (200) rotatably disposed in the first chamber (12) of the housing; An operating mechanism (300) is disposed in the first chamber (12) and is arranged in linkage with the handle (200), comprising a contact support (330) and two side-by-side movable contacts (340) arranged in linkage with the contact support (330), and the two movable contacts (340) are partially extended into the second chamber (13) and the third chamber (14) respectively; Two arc extinguishing systems are respectively placed in the second chamber (13) and the third chamber (14), and the front ends of the arc extinguishing systems are provided with a static contact assembly (600) arranged corresponding to the moving contact (340). An arc-starting plate (500) is provided at the lower ends of the two arc-extinguishing systems. The arc-starting plate (500) extends from the bottom of the arc-extinguishing system to the bottom of the moving contact (340) when the moving contact (340) is at a maximum opening distance. An arc-blocking plate (350) is provided between the moving contact (340) and the contact support (330) and is linked to the moving contact (340). The arc-blocking plate (350) is located above the moving path of the moving contact (340).

2. The circuit breaker capable of quickly extinguishing arcs according to claim 1, wherein: The moving contact (340) is fixedly arranged on the contact support (330) via a moving contact retaining frame (370).

3. The circuit breaker capable of quickly extinguishing arcs according to claim 2, wherein: Two moving contacts (340) are arranged side by side, and their bottoms are connected together via a connecting portion, and the connecting portion is rotatably arranged on the moving contact holder (370) via a connecting shaft, and the connecting shaft is arranged perpendicular to the rotating shaft of the operating mechanism (300).

4. A circuit breaker capable of quickly extinguishing arcs according to claim 2 or 3, characterized in that: The arc blocking piece (350) is arranged between the moving contact retaining frame (370) and the moving contact.

5. A circuit breaker capable of quickly extinguishing arcs according to claim 4, characterized in that: Any side of the housing is provided with a position-limiting support member (32) arranged above the arc-blocking sheet (350).

6. The circuit breaker capable of quickly extinguishing arc according to claim 4, wherein: A lower plate (31) of a stationary contact plate (610) for isolating a connection wiring assembly from a stationary contact is provided on one side of the middle cover.

7. The circuit breaker capable of quickly extinguishing arc according to claim 6, wherein: A position limiting support member (32) is provided on one side of the lower plate (31).

8. A circuit breaker capable of quickly extinguishing arcs according to claim 1, characterized in that: The operating mechanism comprises a lock buckle, wherein the lock buckle (310) comprises a circular hole (311) used as a rotation center, a fan-shaped body (312) distributed in a fan shape with the circular hole (311) as the center, and an overlapping portion (313) extending from the other side of the circular hole and overlapping with the jump buckle, and a cavity is formed between the fan-shaped body and the contact support, and a lock buckle reset spring (360) is arranged in the cavity.

9. The circuit breaker capable of quickly extinguishing arc according to claim 8, characterized in that: A double gold sheet (400) is also provided in the first chamber, the double gold sheet (400) is located at the rear end of the moving contact arranged in the second chamber, and a guide groove (33) is provided between the middle cover and the second shell body, a pull rod (410) is provided in the guide groove (33), the rear end of the pull rod (410) is placed behind the double gold sheet (400), and the front end of the pull rod (410) is arranged in linkage with the operating mechanism.

10. A circuit breaker capable of quickly extinguishing arcs according to claim 9, characterized in that: A hook portion (314) is provided at the lower end of the lock buckle (310), and the hook portion (314) is disposed behind the front end of the pull rod (410).

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