CN210349622U

CN210349622U - Small-sized circuit breaker

Info

Publication number: CN210349622U
Application number: CN201921368883.6U
Authority: CN
Inventors: 刘成萍; 周长青; 葛伟骏
Original assignee: Zhejiang Chint Electrics Co Ltd
Current assignee: Zhejiang Chint Electrics Co Ltd
Priority date: 2019-08-21
Filing date: 2019-08-21
Publication date: 2020-04-17
Anticipated expiration: 2029-08-21

Abstract

A miniature circuit breaker comprises a moving contact and a static contact which are arranged in a shell, wherein a shielding part is arranged between the moving contact and the static contact, and a limit groove is arranged in the shell; the shielding part comprises a connecting end connected with the moving contact and a shielding end used for shielding electric arcs between the moving contact and the fixed contact; the connecting end of the shielding piece is rotatably arranged on the movable contact, an elastic piece is arranged between the shielding piece and the movable contact, a contact part matched with the limiting groove is arranged on the shielding piece, the contact part slides in the limiting groove when the shielding piece rotates, and the elastic piece drives the shielding piece to rotate to enable the shielding end to extend into a position between the movable contact and the fixed contact when the shielding piece is separated; during closing, the moving contact swings to enable the limiting groove to act on the contact part, drives the shielding part to overcome elastic force to enable the shielding part to move out between the moving contact and the static contact.

Description

Small-sized circuit breaker

Technical Field

The utility model relates to a circuit protector, concretely relates to miniature circuit breaker.

Background

The direct current power system has cut-off critical power or low current, and the electric arc is not easy to extinguish because the direct current has no zero-crossing current unlike the alternating current. The opening distance of the existing miniature circuit breaker is between 5mm and 5.5mm, the circuit breaker cannot elongate electric arcs when critical current or small current is cut off, the electric arcs continuously burn, are difficult to extinguish, have long burning time, and are not beneficial to normal use of the circuit breaker.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure, miniature circuit breaker that the reliability is high.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a miniature circuit breaker comprises a moving contact and a static contact which are arranged in a shell, wherein a shielding part is arranged between the moving contact and the static contact, and a limit groove is arranged in the shell; the shielding part comprises a connecting end connected with the moving contact and a shielding end used for shielding electric arcs between the moving contact and the fixed contact; the connecting end of the shielding piece is rotatably arranged on the movable contact, an elastic piece is arranged between the shielding piece and the movable contact, a contact part matched with the limiting groove is arranged on the shielding piece, the contact part slides in the limiting groove when the shielding piece rotates, and the elastic piece drives the shielding piece to rotate to enable the shielding end to extend into a position between the movable contact and the fixed contact when the shielding piece is separated; when the switch is switched on, the moving contact swings to enable the limiting groove to act on the contact part, and the shielding part is driven to overcome the elasticity of the elastic part to enable the shielding part to move out of the position between the moving contact and the static contact.

Preferably, the connecting end of the shielding element is provided with a mounting groove, the moving contact is supported in the mounting groove through a rotating connecting element, the shielding element can rotate around the rotating connecting element, the elastic element is sleeved on the rotating connecting element, one end of the elastic element is connected with the shielding element, and the other end of the elastic element is connected with the moving contact.

Preferably, the shield comprises the linking arm and a shielding baffle that two symmetries set up, the one end of two linking arms is equipped with the first connecting hole that is used for the installation to rotate the connecting piece as the link, and the space between two linking arms is as the mounting groove, and the other end of two linking arms passes through the shielding baffle and connects and form the shielding end.

Preferably, the moving contact is provided with a second connecting hole penetrating through the side wall, a moving contact gap for accommodating the shielding baffle is arranged on the moving contact, one end of the moving contact is a moving contact, and the second connecting hole is positioned between the moving contact and the moving contact gap; the second connecting hole corresponds to the first connecting hole, and the rotating connecting piece penetrates through the first connecting hole and the second connecting hole to support the moving contact in the middle of the mounting groove.

Preferably, the elastic element is symmetrically sleeved between the moving contact and the connecting arms, the elastic element is a torsion spring with a U-shaped part in the middle and torsion spring coils at two ends, the U-shaped part of the torsion spring spans over the moving contact, the torsion spring coils at two ends of the torsion spring are respectively sleeved at two ends of the rotating connecting element, and one ends of the two torsion spring coils, which are far away from the U-shaped part, are respectively connected with the two connecting arms; the edge of the first connecting hole close to one side of the torsion spring forms a stable boss, the torsion spring of the torsion spring is sleeved outside the stable boss, the rotating connecting piece penetrates through the stable boss, and the end face of the stable boss is in contact with the moving contact.

Preferably, shielding baffle and contact site all are located the tip of shielding end, shielding baffle connects between two linking arms and seals the well lower part of shielding end tip, and the upper end face of shielding baffle is less than the upper portion formation baffle of linking arm and dodges the groove.

Preferably, the contact portion is a cylindrical structure protruding from the outer side of the shielding end of the shielding member and capable of extending into the limiting groove.

Preferably, the limiting groove is disposed on the base and/or the cover body, the limiting groove includes a first contact wall and a second contact wall for cooperating with the contact portion, and the first contact wall and the second contact wall are disposed opposite to each other and are both located between the static contact and the moving contact.

Preferably, the first contact wall of the limiting groove is a concave arc surface, and the second contact wall is a convex arc surface opposite to the first contact wall.

Preferably, an operating mechanism, a bimetal component, an electromagnetic trip and an arc extinguishing mechanism are further arranged in the shell; the operating mechanism comprises a support, a lever, a trip buckle, a lock catch and a contact support, wherein the support and the contact support are coaxially arranged in the shell; one side of the other end arm of the lock catch is arranged opposite to the electromagnetic release, and the other side of the other end wall is provided with a release hook which is arranged corresponding to the bimetal component; the electromagnetic release is positioned on one side of the operating mechanism, and the arc extinguish chamber is positioned below the electromagnetic release.

The utility model discloses a miniature circuit breaker, through setting up shielding mechanism between moving contact and static contact, during the separating brake, the shield stretches into between moving contact and the static contact, forces the electric arc lengthening between moving contact and the static contact to make electric arc burn and cool down along the shield surface, effectively reduces the burning time of electric arc, makes electric arc extinguish sooner; when the breaker is switched on, the shielding part can rotate to leave between the moving contact and the fixed contact, so that the normal work of the breaker can not be influenced. The utility model discloses in, the removal of shielding part between moving contact, static contact is realized through moving contact, spacing groove and elastic component cooperation, and simple structure does benefit to batch production.

In addition, because the shielding part is of a symmetrical structure, the moving contact is also symmetrically arranged in the shielding part, so that the shielding part has a stable connection structure, the stress of the shielding part is uniform in the rotation process, and the shielding effect of the shielding part is further ensured.

Drawings

Fig. 1 is a schematic structural diagram of a miniature circuit breaker of the present invention;

fig. 2 is a schematic diagram of the position of the shielding member when the miniature circuit breaker is opened;

fig. 3 is a schematic diagram of the position of the shielding member when the miniature circuit breaker is switched on;

fig. 4 is a schematic structural view of a limiting groove of the miniature circuit breaker of the present invention;

fig. 5 is a schematic view of the connection between the shield and the moving contact of the miniature circuit breaker of the present invention;

fig. 6 is a schematic structural diagram of a movable contact of the miniature circuit breaker of the present invention;

fig. 7 is a schematic view of the connection between the moving contact and the torsion spring of the miniature circuit breaker of the present invention;

fig. 8 is a schematic structural view of a torsion spring and a rotating shaft of the miniature circuit breaker of the present invention;

fig. 9 is a schematic structural view of a shield of the miniature circuit breaker of the present invention;

fig. 10 is a schematic structural view of a shield (inelastic member front face) of the miniature circuit breaker of the present invention;

fig. 11 is a schematic structural view of a shield (back surface without elastic member) of the miniature circuit breaker of the present invention.

Detailed Description

The following describes a detailed embodiment of the miniature circuit breaker according to the present invention with reference to the embodiments shown in fig. 1 to 11. The small-sized circuit breaker of the present invention is not limited to the description of the following embodiments.

A miniature circuit breaker comprises a movable contact 2 and a fixed contact 3 which are arranged in a shell 1, wherein a shielding part is arranged between the movable contact 2 and the fixed contact 3, and a limit groove 4 is arranged in the shell 1; the shielding part comprises a connecting end connected with the moving contact 2 and a shielding end used for shielding electric arcs between the moving contact 2 and the static contact 3; the connecting end of the shielding part is rotatably arranged on the movable contact 2, an elastic part 7 is arranged between the shielding part and the movable contact 2, a contact part 8 matched with the limiting groove 4 is arranged on the shielding part, the contact part 8 slides in the limiting groove 4 when the shielding part rotates, and the elastic part 7 drives the shielding part to rotate to enable the shielding end to extend into a position between the movable contact 2 and the static contact 3 when the shielding part is switched off; when the switch is switched on, the moving contact 2 swings to enable the limiting groove 4 to act on the contact part 8, and the shielding part is driven to overcome the elasticity of the elastic part 7 to enable the shielding part to move out of the space between the moving contact 2 and the static contact 3.

The utility model discloses a miniature circuit breaker, through setting up the shielding mechanism between moving contact 2 and static contact 3, when separating brake, the shielding part stretches into between moving contact 2 and static contact 3, forces the electric arc between moving contact 2 and static contact 3 to lengthen, and makes electric arc burn and cool down along the shielding part surface, effectively reduces the burning time of electric arc, makes electric arc extinguish sooner; when the breaker is switched on, the shielding part can rotate to leave between the moving contact 2 and the static contact 3, so that the normal work of the breaker can not be influenced. The utility model discloses in, the removal of shielding part between moving contact 2, static contact 3 is realized through moving contact 2, spacing groove 4 and the cooperation of elastic component 7, and simple structure does benefit to batch production.

As shown in fig. 1-3, the miniature circuit breaker includes a housing 1 composed of a base and a cover, an operating mechanism, a bimetal assembly, an electromagnetic trip and an arc extinguish chamber are arranged in the housing 1, a moving contact 2 is arranged on a contact support of the operating mechanism, and a static contact 3 opposite to the moving contact 2 is fixedly arranged in the housing 1; a shielding piece for shielding electric arcs between the moving contact 2 and the static contact 3 is arranged between the moving contact 2 and the static contact 3; the shielding piece rotates under the coordination of a limiting groove 4 arranged on the shell 1; the shielding part is provided with a shielding end and a connecting end, the connecting end is used for being rotationally connected with the moving contact 2, the shielding end is used for shielding electric arcs between the moving contact 2 and the static contact 3, an elastic part 7 is arranged between the shielding part and the moving contact 2, one end of the elastic part 7 acts on the shielding part, the other end acts on the moving contact 2, the shielding part rotates towards the direction far away from the moving contact 2, the shielding part is provided with a contact part 8 matched with the limiting groove 4, and the contact part 8 slides in the limiting groove 4 when the shielding part rotates; when the brake is switched off, the elastic element 7 drives the shielding element to rotate, so that the shielding end extends into a space between the moving contact 2 and the static contact 3 to shield electric arcs; when the breaker is switched on, the moving contact 2 swings to drive the shielding part to move, so that the limiting groove 4 acts on the contact part 8 to drive the shielding part to overcome the elastic force of the elastic part 7 to rotate, and the shielding part moves out of the space between the moving contact 2 and the static contact 3 so as to avoid interfering with the normal work of the breaker.

As shown in fig. 4, the limiting groove 4 includes a first contact wall 41 and a second contact wall 42 for cooperating with the contact portion 8, the first contact wall 41 and the second contact wall 42 are disposed opposite to each other and are both located between the static contact 3 and the moving contact 2, and the elastic element 7 and the first contact wall 41 respectively provide an opposite movement trend for the shielding element, so that the shielding element is in a dynamic balance state; when the brake is switched off, the elastic element 7 drives the shielding element to rotate and enables the contact part 8 to be kept in contact with the first contact wall 41, and the shielding end extends into a position between the moving contact 2 and the static contact 3; when the switch is closed, the moving contact 2 swings to enable the shielding element to overcome the elasticity of the elastic element 7, the shielding end moves out of the space between the moving contact 2 and the static contact 3, and the contact part 8 keeps in contact with the first contact wall 41 at the moment. The first contact wall 41 is preferably a segment of a circular arc wall, and the second contact wall 42 is a circular arc wall having the same bending direction as the first contact wall 41. The limiting groove 4 can be arranged on the base or the cover body, and also can be arranged on the base and the cover body at the same time, and is set according to the number of the contact parts 8 and whether the contact parts are symmetrical structures, and preferably arranged on the base and the cover body at the same time.

As shown in fig. 5, 9, 10 and 11, the connecting end of the shielding member is provided with an installation slot for accommodating the moving contact 2, the location of the installation slot is preferably located in the middle of the connecting end, the moving contact 2 is supported in the installation slot through a rotating connecting member 6, the shielding member can rotate around the rotating connecting member 6, the elastic member 7 is sleeved on the rotating connecting member 6, one end of the elastic member is connected with the shielding member, and the other end of the elastic member is connected with the moving contact 2; the shielding end 8 of shielding part is equipped with towards the convex contact site 8 of 4 directions of spacing groove, contact site 8 stretches into spacing groove 4, and the preferred cylinder that can stretch into spacing groove 4 of shape of contact site 8 makes the curved surface of contact site 8 do benefit to and cooperates with the contact of spacing groove 4, reduces the friction. The shielding piece can adopt symmetrical or asymmetrical structure, the utility model discloses preferably be symmetrical structure, make the shielding piece atress even, stable in structure at the rotation in-process.

In a preferred embodiment, as shown in fig. 5, the shielding member is composed of two symmetrically arranged connecting arms 5 and a shielding baffle 9, one end of each connecting arm 5 is provided with a first connecting hole 51 for installing the rotating connecting member 6 as a connecting end, a gap between the two connecting arms is used as a mounting groove, and the other ends of the two connecting arms 5 are connected through the shielding baffle 9 to form a shielding end.

As shown in fig. 2, 6 and 8, one end of the movable contact 2 is connected to a contact support of the operating mechanism, the other end is provided with a movable contact, one side of the movable contact 2 is located in a mounting groove between two connecting arms 5, the movable contact 2 is provided with a second connecting hole 21 penetrating through the side wall, a movable contact gap 22 accommodating the shielding baffle 9 is arranged on the movable contact 2, one end of the movable contact 2 is the movable contact, the second connecting hole 21 is located between the movable contact and the movable contact gap 22, the second connecting hole 21 corresponds to the first connecting hole 51, and the rotating connecting piece 6 penetrates through the first connecting hole 51 and the second connecting hole 21 to support the movable contact 2 in the middle of the mounting groove.

As shown in fig. 9, the rotating connecting member 6 is specifically a rotating shaft, the elastic member 7 is symmetrically sleeved between the moving contact 2 and the connecting arms 5, the elastic member 7 is preferably a torsion spring having a U-shaped portion 71 at the middle and torsion spring coils at two ends, the U-shaped portion 71 of the torsion spring straddles over the moving contact 2, the torsion spring coils at two ends of the torsion spring are respectively sleeved at two ends of the rotating shaft, and one end of each of the two torsion spring coils, which is far away from the U-shaped portion 71, is respectively connected to the two connecting arms 5. The U-shaped part 71 of the torsion spring acts on the movable contact 2, one end of each of the two torsion spring coils, which is far away from the U-shaped part 71, acts on the shielding part, so that the shielding part rotates towards the direction far away from the movable contact 2, and in the switching-on process, the two ends of the torsion spring gradually approach the U-shaped part 71 along with the shielding part, so that the torsion spring generates resistance required to be overcome by the shielding part; the edge of the first connecting hole 51 close to one side of the torsion spring forms a stable boss 52, the torsion spring is sleeved outside the stable boss 52, the rotating shaft penetrates through the stable boss 52, the end face of the stable boss 52 is in contact with the moving contact 2, and the gap between the torsion spring and the rotating shaft is reduced to ensure the structural stability of the torsion spring during torsion.

As shown in fig. 9-11, the shielding baffle 9 and the contact portion 8 are both located at the end portion of the shielding end, the shielding baffle 9 is connected between the two connecting arms 5 and seals the middle and lower portions of the end portion of the shielding end, and a baffle avoiding groove 91 is formed at the upper end surface of the shielding baffle 9 lower than the upper portion of the connecting arm 5 for matching with the U-shaped portion 71 of the torsion spring and the moving contact gap 22 of the moving contact 2; the contact site 8 is two cylindrical structures of symmetry that the outside protrusion of two linking arms 5 formed and can stretch into the spacing groove 4, the top of contact site 8 is higher than the upper portion of linking arm 5, forms the space that supplies the U-shaped portion 71 activity of torsional spring between two contact sites 8 and the shielding baffle 9, is favorable to reducing the shared space of shield in casing 1. Preferably, the limiting grooves 4 are symmetrically arranged on the cover body and the base at the same time so as to ensure the stress balance and the rotation stability of the shielding part. As shown in fig. 4, the first contact wall 41 and the second contact wall 42 of the limiting groove 4 are preferably formed by two opposite arc surfaces, the first contact wall 41 is a concave arc surface, the second contact wall 42 is a convex arc surface opposite to the first contact wall 41, the first contact wall 41 is always in contact with the contact portion 8, so that the whole shielding member has a tendency of rotating, and in the breaking process, the second contact wall 42 prevents the shielding member from being unable to block the movable contact and the stationary contact 3 under the action of air blowing.

As shown in fig. 1, an operating mechanism, a bimetal assembly, an electromagnetic trip and an arc extinguishing mechanism are further arranged in a housing 1 of the circuit breaker; the operating mechanism comprises a support, a lever, a trip buckle, a lock catch and a contact support, wherein the support and the contact support are coaxially arranged in the shell 1, the trip buckle, the lock catch and the contact support are connected to the support, one end of the lever is connected with the handle, the other end of the lever is connected with the trip buckle, the trip buckle is connected with an end arm hasp of the lock catch, one end of the contact support is provided with a moving contact 2, and the moving contact 2 is arranged opposite to a static contact 3 fixedly arranged in the shell 1; one side of the other end arm of the lock catch is arranged opposite to the electromagnetic release, and the other side of the other end wall is provided with a release hook which is arranged corresponding to the bimetal component; the electromagnetic release is positioned on one side of the operating mechanism, and the arc extinguish chamber is positioned below the electromagnetic release.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims

1. The utility model provides a miniature circuit breaker, is including setting up moving contact (2) and static contact (3) in casing (1), its characterized in that: a shielding part is arranged between the moving contact (2) and the static contact (3), and a limiting groove (4) is arranged in the shell (1);

the shielding part comprises a connecting end connected with the moving contact (2) and a shielding end used for shielding electric arcs between the moving contact (2) and the static contact (3); the connecting end of the shielding part is rotatably arranged on the movable contact (2), an elastic part (7) is arranged between the shielding part and the movable contact (2), a contact part (8) matched with the limiting groove (4) is arranged on the shielding part, the contact part (8) slides in the limiting groove (4) when the shielding part rotates, and the elastic part (7) drives the shielding part to rotate to enable the shielding end to extend into a position between the movable contact (2) and the static contact (3) when the shielding part is switched off; when the switch is switched on, the moving contact (2) swings to enable the limiting groove (4) to act on the contact part (8), and the shielding part is driven to overcome the elasticity of the elastic part (7) to enable the shielding part to move out of the position between the moving contact (2) and the static contact (3).

2. A miniature circuit breaker according to claim 1, wherein: the connecting end of the shielding part is provided with a mounting groove, the moving contact (2) is supported in the mounting groove through a rotating connecting part (6), the shielding part can rotate around the rotating connecting part (6), the rotating connecting part (6) is sleeved with an elastic part (7), one end of the elastic part is connected with the shielding part, and the other end of the elastic part is connected with the moving contact (2).

3. A miniature circuit breaker according to claim 2, wherein: the shielding part comprises linking arm (5) and a shielding baffle (9) that two symmetries set up, the one end of two linking arms (5) is equipped with first connecting hole (51) that are used for installing rotation connecting piece (6) as the link, and the space between two linking arms is as the mounting groove, and the other end of two linking arms (5) is passed through shielding baffle (9) and is connected formation shielding end.

4. A miniature circuit breaker according to claim 3, wherein: the moving contact (2) is provided with a second connecting hole (21) penetrating through the side wall, a moving contact notch (22) accommodating the shielding baffle (9) is arranged on the moving contact (2), one end of the moving contact (2) is a moving contact, and the second connecting hole (21) is positioned between the moving contact and the moving contact notch (22); the second connecting hole (21) corresponds to the first connecting hole (51), and the rotating connecting piece (6) penetrates through the first connecting hole (51) and the second connecting hole (21) to support the moving contact (2) in the middle of the mounting groove.

5. A miniature circuit breaker according to claim 3, wherein: the elastic element (7) is symmetrically sleeved between the moving contact (2) and the connecting arms (5), the elastic element (7) is a torsion spring with a U-shaped part (71) in the middle and torsion spring coils at two ends, the U-shaped part (71) of the torsion spring spans over the moving contact (2), the torsion spring coils at two ends of the torsion spring are respectively sleeved at two ends of the rotating connecting element (6), and one ends of the two torsion spring coils, which are far away from the U-shaped part (71), are respectively connected with the two connecting arms (5); the edge of the first connecting hole (51) close to one side of the torsion spring forms a stable boss (52), the torsion spring of the torsion spring is sleeved outside the stable boss (52), the rotating connecting piece (6) penetrates through the stable boss (52), and the end face of the stable boss (52) is contacted with the moving contact (2).

6. A miniature circuit breaker according to claim 3, wherein: shielding baffle (9) all are located the tip of shielding end with contact site (8), shielding baffle (9) are connected between two linking arm (5) and will shield the well lower part of end portion and seal, and the up end of shielding baffle (9) is less than the upper portion formation baffle of linking arm (5) and dodges groove (91).

7. A miniature circuit breaker according to claim 1, wherein: the contact part (8) is a cylindrical structure which is protruded from the outer side of the shielding end of the shielding piece and can extend into the limiting groove (4).

8. A miniature circuit breaker according to any of claims 1-7, wherein: the limiting groove (4) is arranged on the base and/or the cover body, the limiting groove (4) comprises a first contact wall (41) and a second contact wall (42) which are used for being matched with the contact part (8), and the first contact wall (41) and the second contact wall (42) are arranged oppositely and are both positioned between the static contact (3) and the movable contact (2).

9. A miniature circuit breaker according to claim 8, wherein: the first contact wall (41) of the limiting groove (4) is a concave arc surface, and the second contact wall (42) is a convex arc surface opposite to the first contact wall (41).

10. A miniature circuit breaker according to claim 1, wherein: an operating mechanism, a bimetal component, an electromagnetic trip and an arc extinguishing mechanism are also arranged in the shell (1); the operating mechanism comprises a support, a lever, a trip buckle, a lock catch and a contact support, wherein the support and the contact support are coaxially arranged in the shell (1), the trip buckle, the lock catch and the contact support are connected to the support, one end of the lever is connected with the handle, the other end of the lever is connected with the trip buckle, the trip buckle is connected with an end arm hasp of the lock catch, one end of the contact support is provided with a moving contact (2), and the moving contact (2) is arranged opposite to a static contact (3) fixedly arranged in the shell (1); one side of the other end arm of the lock catch is arranged opposite to the electromagnetic release, and the other side of the other end wall is provided with a release hook which is arranged corresponding to the bimetal component; the electromagnetic release is positioned on one side of the operating mechanism, and the arc extinguish chamber is positioned below the electromagnetic release.