CN220856483U - Conductive loop of molded case circuit breaker - Google Patents

Abstract

The invention provides a conductive loop of a molded case circuit breaker, which comprises a contact, a rotating shaft, a shell, a protective cover, a flexible connection, a conductive piece, a fixing piece and an elastic piece. The contact is tightly fixed on one end of the contact, the other end of the contact is fixedly conducted with one end of the flexible connection, the other end of the flexible connection is fixedly conducted with the conductive piece, and the contact, the flexible connection and the conductive piece are sequentially connected and conducted to form a conductive loop of the molded case circuit breaker together. The flexible connection is provided with an upper flexible section and a lower flexible section, the upper flexible section and the lower flexible section are hollow, circulation in the middle of heat dissipation air is facilitated, and heat is taken away. The upward overturning action speed of the contact is improved through the electromagnetic force between the upper flexible section and the lower flexible section, so that the molded case circuit breaker can cut off current more quickly. The protective cover is provided with a conductive section protective tongue which is coupled with the limiting block, so that the contact piece is isolated from an arc extinguishing cavity in the shell, and damage of high-temperature metal particles to the contact piece during breaking current is avoided.

Description

Conductive loop of molded case circuit breaker

Technical Field

The present invention relates to a circuit breaker, and more particularly, to a conductive loop structure of a circuit breaker.

Background

The molded case circuit breaker consists of a moving contact, a fixed contact, an arc extinguishing chamber, a shell, an operating mechanism, a rotating shaft, a tripping protection unit and the like.

The operating mechanism drives the rotating shaft provided with the moving contact to rotate in the shell, so that the moving contact is attached to or separated from the fixed contact, and the connection and disconnection of a protected circuit are realized. When a fault occurs in the circuit, the tripping protection unit senses and acts to drive the operating mechanism to trip, so that the moving contact and the fixed contact are rapidly separated, and the effect of cutting off fault current is achieved. In the process of rapidly separating the moving contact from the fixed contact, an arc can be generated between the moving contact and the fixed contact, and enters an arc extinguishing chamber to be extinguished. The arc generating and extinguishing process is often accompanied with the ablation process of high-heat arc to the moving contact, the fixed contact, the arc extinguishing chamber and the like, a large amount of metal and nonmetal particles are generated, and on one hand, the internal structure of the molded case circuit breaker is easy to burn out, so that the product is invalid; on the other hand, the structure is easy to be blocked, so that the product cannot work normally.

The moving contact conductive loop in the prior art comprises a moving contact, a flexible connection and a conductor which are sequentially connected to form a conductive path, wherein the moving contact comprises a moving contact and a moving contact blade, and the moving contact are welded together. The soft connection consists of copper wire soft braided wires, one end of the soft connection is welded and fixed with the movable contact piece to form electric connection, and the other end of the soft connection is welded with the conductor to form electric connection. In the circuit breaker with larger rated current, each phase of moving contact adopts a mode of connecting a plurality of moving contacts in parallel to increase the sectional areas of the contact point and the current path so as to reduce the adverse effects of Hall force and skin effect. The soft connection formed by the copper wire soft braided wires and the whole copper braided wires are loose structures, so that the thickness of the copper braided wires is increased for increasing the conductive sectional area of the copper braided wires in rated current products, the action of the actuation contact piece is easy to be conducted in a less flexible way, the normal action and the action speed of fault current are influenced, the performance of breaking fault current of the products is influenced, and potential use safety hazards are caused.

Disclosure of Invention

The invention aims to provide a movable contact conductive loop structure of a molded case circuit breaker with a contact protection cover and copper foil in flexible connection, which solves the problems of insulation protection and quick action in the breaking fault current process of a conductive system of the molded case circuit breaker.

In order to achieve the above purpose, the invention designs a conductive loop of a molded case circuit breaker, which comprises a contact, a rotating shaft, a shell, a protective cover, a flexible connection, a conductive piece, a fixing piece and an elastic piece. The contact is tightly fixed on one end of the contact, the other end of the contact is fixedly conducted with one end of the flexible connection, the other end of the flexible connection is fixedly conducted with the conductive piece, and the contact, the flexible connection and the conductive piece are sequentially connected and conducted to form a conductive loop of the molded case circuit breaker together. The conductive loop of the molded case circuit breaker is rotatably arranged on the rotating shaft through the contact piece. The rotating shaft is rotatably arranged in the rotor cavity of the shell, so that the contact piece can rotate in the shell. The contact is provided with a protective cover. The flexible connection is characterized in that an upper flexible section and a lower flexible section are arranged in the flexible connection. The upper flexible section is arranged close to the inner shell of the outer shell, and the lower flexible section is arranged close to the bottom shell of the outer shell; the upper flexible section and the lower flexible section are hollow. The protection casing is equipped with electrically conductive section protection tongue, electrically conductive section protection tongue covers pivot epaxial stopper, electrically conductive section protection tongue and stopper phase coupling for the contact is isolated with the arc extinguishing chamber in the shell.

Further, the two ends of the flexible connection are provided with a contact fixing end and a conductive piece fixing end of the rigid conductor. The contact piece fixed end is fixedly conducted with the contact piece, and the conductive piece fixed end is fixedly conducted with the conductive piece. The contact piece fixed end and the conductive piece fixed end are connected and conducted with each other through the upper flexible sections and the lower flexible sections of the two flexible conductors.

Further, the contact piece comprises a contact section, a conductive section and a movable end. The contact section is provided with a contact groove for fixing the contact, and the contact section is provided with an assembly hole for installing the protective cover. The middle part of the movable end is provided with a rotating hole. And a fixed groove coupled with the fixed end of the contact piece is formed in one side, close to the flexible connection, of the movable end. The upper side of the fixed slot is provided with an arc-shaped upper supporting surface, and the lower side of the fixed slot is provided with an arc-shaped lower supporting surface. An elastic piece action groove for installing an elastic piece is formed in one side, close to the rotating shaft, of the movable end. The movable end is connected and conducted with the contact section through natural transition of the conductive section.

Further, the shield is provided with contact segment shields coupled to the contact segments on the contact segments. The two sides of the contact section protection sheet are provided with side protection sheets matched with the contact section; and the side protection sheet is provided with mounting holes corresponding to the mounting holes on the contact section. And the side, close to the conducting segment of the contact piece, of the contact segment protection piece is naturally transitionally extended to form a conducting segment protection tongue. And a notch contact hole for fixedly mounting the contact is reserved on one side of the contact section protection sheet, which is close to the contact groove of the contact sheet.

Further, the outer shell is enveloped by an inner shell at the upper part, a bottom shell at the lower part and a side wall to form a rotor cavity and an arc extinguishing cavity which are hollow in the interior. The rotor cavity is positioned in the middle of the shell; the rotor cavity is coupled with the shaft. The bottom shell is provided with a circular arc bearing surface at a position close to and facing to the fixed end of the flexible connecting conductive piece. The bottom shell and the bearing surface are coupled with the lower flexible section.

Further, a connecting section which is fixedly connected and conducted with the soft connection is arranged on one side, close to the soft connection, of the conductive piece. The connecting section is close to and faces the position of the soft connection, an arc-shaped supporting surface is arranged on the connecting section, and the inner shell and the supporting surface are coupled with the flexible section.

The invention has the technical effects that the hollow flexible connection moving contact with copper foil which is split up and down is designed; the internal space of the shell is more reasonably utilized, the current carrying area of the soft connection is increased, and the heat dissipation effect of the link is improved, so that the operation temperature rise of the molded case circuit breaker is reduced; meanwhile, the upper and lower stranding flexible connection structure with copper foil can effectively provide electromagnetic force in the breaking fault current process, so that the action speed of the movable contact is improved, and the rapid breaking fault current of the molded case circuit breaker is ensured. In addition, the contact adopts the protection cover with the conductive segment protection tongue, and through the staggered protection design of the conductive segment protection tongue and the insulating rotating shaft, the contact is more effectively helped to isolate metal and nonmetal particles from the arc extinguishing chamber in the breaking fault current process, and the influence of the metal and nonmetal particles is avoided, so that the reliability of a product is improved.

Drawings

Fig. 1 is a schematic structural diagram of a conductive loop closing state of a molded case circuit breaker according to the present invention;

FIG. 2 shows a structure of a conductive loop of a molded case circuit breaker in a breaking state;

FIG. 3 is an exploded view of the shield of the conductive circuit of the molded case circuit breaker in accordance with the present invention;

fig. 4 is an enlarged view of a part of a protective cover of a conductive circuit of a molded case circuit breaker according to the present invention;

FIG. 5 is a schematic diagram of a prior art copper braid of a molded case circuit breaker conductive loop;

FIG. 6 is a schematic diagram of a flexible copper foil connection of a conductive circuit of a molded case circuit breaker according to the present invention;

Detailed Description

Features and exemplary embodiments of various aspects of the present application will be described in detail below, and in order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the particular embodiments described herein are meant to be illustrative of the application only and not limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the application by showing examples of the application.

Marking:

The contact 1, 1a, the contact section 101, the conductive section 102, the movable end 103, the contact groove 104, the fitting hole 105, the fixing groove 106, the upper supporting surface 107, the lower supporting surface 108, the rotation hole 109, the elastic member action groove 110,

The contact point 2 is provided with a contact point,

The rotation shaft 3, the limiting block 301,

Outer housing 4, rotor chamber 401, bearing surface 402, inner housing 403, bottom housing 404, arc extinguishing chamber 405,

Shield 5, side shield plate 501, spacer plate 502, contact hole 503, contact section shield plate 504, conductive section shield tongue 505, mounting hole 506, mounting groove 507

Flexible connection 6, contact fixing ends 601, 601a, conductive member fixing ends 602, 602a, upper flexible section 603, lower flexible section 604, flexible sections 603a, 603b,

Conductive member 7, connection section 701, conduction section 702, transition section 703, terminal 704, support surface 705,

A fixing member 8 and an elastic member 9.

As shown in fig. 1 and 2, the conductive circuit of the molded case circuit breaker provided by the invention comprises a contact piece 1, a contact 2, a rotating shaft 3, a shell 4, a protective cover 5, a flexible connection 6, a conductive piece 7, a fixing piece 8 and an elastic piece 9. The contact 2 is tightly fixed on one end of the contact 1, the other end of the contact 1 is fixedly conducted with one end of the flexible connection 6, the other end of the flexible connection 6 is fixedly conducted with the conductive piece 7, and the contact 2, the contact 1, the flexible connection 6 and the conductive piece 7 are sequentially connected and conducted to form a conductive loop of the molded case circuit breaker together. The conductive loop of the molded case circuit breaker is rotatably arranged on the rotating shaft 3 through the contact piece 1. The shaft 3 is rotatably mounted in a rotor cavity 401 of the housing 4 such that the contact 1 is rotatable in the housing 4. As shown in fig. 1, when the contact 1 approaches to the bottom case 404 along with the rotating shaft 3, the molded case circuit breaker is in a closing state; as shown in fig. 2, when the contact 1 moves away from the bottom case 404 along with the rotating shaft 3, the molded case circuit breaker is in a breaking state.

The outer case 4 shown in fig. 1 is formed with an inner case 403 at the upper portion, a bottom case 404 at the lower portion, and a sidewall envelope to form a hollow space inside. The inner part of the broken line located in the middle of the housing 4 is a rotor chamber 401. The rotor chamber 401 is coupled to a rotation shaft 3, and the rotation shaft 3 is rotatable in the rotor chamber 401. The movable cavity of the contact 1 rotating along with the rotating shaft 3 is an arc extinguishing cavity 405. When the circuit breaker breaks a fault current, a large amount of metal and non-metal particles are generated in the arc extinguishing chamber 405. The bottom shell 404 is provided with a circular arc-shaped bearing surface 402 near to and towards the fixed end 602 of the conductive piece of the flexible connection 6. The bottom shell 404 and the bearing surface 402 are coupled with a lower flexible section 604. When the flexible connection 6 is pulled by the action of the contact 1 or the flexible connection 6 is electrified by the conductive loop to receive electromagnetic force, the lower flexible section 604 of the flexible connection 6 close to the bearing surface 402 is clung to the bearing surface 402, so that support and force transmission are obtained.

Fig. 3 shows a contact 1 of a conductive circuit of a molded case circuit breaker according to the present invention, which is a sheet structure made of a conductive material. It is particularly pointed out that the number of contacts 1 per phase of molded case circuit breakers of different current specifications is different. The number of the contact pieces 1 of each phase of the plastic shell circuit breaker with small current specification is one; in order to reduce the adverse effects of Hall force and skin effect, each phase of the molded case circuit breaker with large current specification adopts a mode of connecting a plurality of contact pieces 1 in parallel to increase the cross sections of contact points and current paths. The contact 1 is formed by three parts of a contact section 101, a conductive section 102 and a movable end 103, and is bent. The contact section 101 is located at one end of the contact piece 1, a contact groove 104 is formed in the contact section 101, the shape of the contact groove 104 is matched with that of the contact 2, and the contact 2 is fixed to the contact groove 104 to achieve connection and conduction between the contact 2 and the contact piece 1. The molded case circuit breaker drives the contact piece 1 to be attached to and detached from the static contact through the operating mechanism, so that the on-off of a protection circuit is realized. The contact section 101 is provided with an assembly hole 105 for mounting the protective cover 5. The other end of the contact 1 is provided with a movable end 103. A rotation hole 109 is provided in the middle of the movable end 103. The contact 1 is rotatably mounted on the rotating shaft 3 through the rotation hole 109. A fixed slot 106 is arranged on one side of the movable end 103 close to the flexible connection 6. The fixing groove 106 is coupled with the contact fixing end 601 of the flexible connection 6. The contact fixing end 601 of the flexible connection 6 is fixed in the fixing groove 106, so that connection conduction between the flexible connection 6 and the contact 1 is realized. The upper side of the fixed slot 106 is provided with an arc-shaped upper supporting surface 107, and the lower side of the fixed slot 106 is provided with an arc-shaped lower supporting surface 108. When the flexible connection 6 is pulled by the action of the contact 1 or the conductive loop is electrified and the flexible connection 6 is subjected to electromagnetic force, the upper flexible section 603 of the flexible connection 6 close to the upper supporting surface 107 is clung to the upper supporting surface 107, so that the support and the transmission of the force are obtained; the lower flexible section 604 of the flexible connection 6 adjacent to the lower support surface 108 will abut against the lower support surface 108, resulting in support and force transfer. The movable end 103 is provided with an elastic member action groove 110 at one side close to the rotating shaft 3, and the elastic member action groove 110 is used for mounting the elastic member 9. The movable end 103 is connected and conducted with the contact section 101 through the natural transition of the conductive section 102.

The protective cover 5 made of insulating material for the conductive circuit of the molded case circuit breaker according to the present invention shown in fig. 3 is provided with a contact segment protecting piece 504 coupled with the contact segment 101 on the contact segment 1. The contact section guard piece 504 is provided with side guard pieces 501 on both sides, which are shape-matched with the contact section 101. The contact section protection sheet 504 and the side protection sheet 501 are enveloped to form a space installation groove 507 for installing the contact sheet 1, and the contact section 101 is insulated and protected, so that the contact section 101 is isolated from the arc extinguishing cavity 405 in the shell 4, and the damage of high-temperature metal particles and nonmetal particles of the arc extinguishing cavity 405 to the contact sheet 1 when the plastic shell circuit breaker breaks current is avoided. It should be noted that, for the structure that the multiple contact pieces 1 are connected in parallel, a plurality of spacer pieces 502 are disposed between the side protection pieces 501 on both sides, and the space enclosed by the side protection pieces 501 and the contact section protection pieces 504 on both sides is divided into a plurality of mounting grooves 507. The side guard 501 and the spacer 502 are provided with mounting holes 506. The mounting holes 506 correspond to the mounting holes 105 on the contact section 101. The contact segment protecting piece 504 is near one side of the conductive segment 102 of the contact 1, and extends in a natural transition manner to form a conductive segment protecting tongue 505. The conducting segment protection tongue 505 is coupled with the rotating shaft 3, and covers the passage of the conducting segment 102 to the arc extinguishing cavity 405, so that the contact 1 is isolated from the arc extinguishing cavity 405 in the shell 4, and the damage of high-temperature metal particles and nonmetal particles of the arc extinguishing cavity 405 to the contact 1 when the plastic-case circuit breaker breaks current is avoided. The contact segment protecting piece 504 is close to one side of the contact slot 104 of the contact piece 1, and is provided with a notch contact hole 503 for fixedly mounting the contact 2. The contact 2 is fixed to the contact piece 1 just penetrating from the contact hole 503, and the protective cover 5 protects the contact piece 1 in an insulating manner, so that the connection and disconnection of a conductive loop of the molded case circuit breaker are not affected.

In the conductive circuit of the molded case circuit breaker provided by the invention shown in fig. 6, a connecting section 701 which is fixedly connected and conducted with the flexible connection 6 is arranged on one side of the conductive member 7 close to the flexible connection 6. The flexible connection 6 is fixedly connected with the connecting section 701, so that the flexible connection 6 is connected and conducted with the conductive piece 7. The connection section 701 is provided with a circular arc-shaped supporting surface 705 near and towards the flexible connection 6. The inner shell 403 and the support surface 705 are coupled to the flexible segment 603. When the flexible connection 6 is pulled by the action of the contact 1 or the flexible connection 6 is electrified by the conductive loop to receive electromagnetic force, the upper flexible section 603 of the flexible connection 6 close to the supporting surface 705 is clung to the supporting surface 705, so that support and transmission of force are obtained.

The two ends of the flexible connection 6 of the conductive circuit of the molded case circuit breaker provided by the invention shown in fig. 1 and 2 are provided with a contact fixing end 601 and a conductive piece fixing end 602 of a rigid conductor. The fixed end 601 of the contact is fixedly connected with the contact 1. The fixed end 602 of the conductive member is fixedly connected with the conductive member 7. The contact fixing end 601 and the conductive piece fixing end 602 are connected and conducted with each other through two flexible conductor upper flexible sections 603 and lower flexible sections 604. The upper flexible section 603 is arranged close to the inner shell 403 of the outer shell 4 and the lower flexible section 604 is arranged close to the bottom shell 404 of the outer shell 4. The upper flexible section 603 and the lower flexible section 604 are hollow, which is beneficial to circulation of heat dissipation air in the middle and takes away relevant heat. When fault current passes through the upper flexible section 603 and the lower flexible section 604, because the current passing through the upper flexible section 603 and the lower flexible section 604 are in the same direction, an electromagnetic force which attracts each other is generated between the upper flexible section 603 and the lower flexible section 604, so that the flexible connection 6 moves towards the bottom shell 404, thereby driving the contact 1 to have a tendency to flip upwards. When the molded case circuit breaker is opened, electromagnetic forces applied to the upper flexible section 603 and the lower flexible section 604 can effectively improve the upward overturning speed of the contact 1, so that the molded case circuit breaker cuts off current faster, and damage of fault current to a circuit is reduced.

While the invention has been described with respect to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Equivalent embodiments of the present invention will be apparent to those skilled in the art having the benefit of the teachings disclosed herein, when considered in the light of the foregoing disclosure, and without departing from the spirit and scope of the invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims (6)

1. A conductive loop of a molded case circuit breaker comprises a contact (1), a contact (2), a rotating shaft (3), a shell (4), a protective cover (5), a flexible connection (6), a conductive piece (7), a fixing piece (8) and an elastic piece (9);

The contact (2) is tightly fixed on one end of the contact (1), the other end of the contact (1) is fixedly conducted with one end of the flexible connection (6), the other end of the flexible connection (6) is fixedly conducted with the conductive piece (7), and the contact (2), the contact (1), the flexible connection (6) and the conductive piece (7) are sequentially connected and conducted to form a conductive loop of the molded case circuit breaker;

The conductive loop of the molded case circuit breaker is rotatably arranged on the rotating shaft (3) through the contact piece (1);

The rotating shaft (3) is rotatably arranged in a rotor cavity (401) of the shell (4) so that the contact piece (1) can rotate in the shell (4);

The contact (1) is provided with a protective cover (5);

It is characterized in that the method comprises the steps of,

The flexible connection (6) is provided with an upper flexible section (603) and a lower flexible section (604); the upper flexible section (603) is arranged close to the inner shell (403) of the outer shell (4), and the lower flexible section (604) is arranged close to the bottom shell (404) of the outer shell (4); the upper flexible section (603) and the lower flexible section (604) are hollow;

The protective cover (5) is provided with a conductive segment protection tongue (505), the conductive segment protection tongue (505) covers a limiting block (301) on the rotating shaft (3), and the conductive segment protection tongue (505) is coupled with the limiting block (301) so that the contact (1) is isolated from an arc extinguishing cavity (405) in the shell (4).

2. A conductive circuit of a molded case circuit breaker according to claim 1, characterized in that the two ends of the flexible connection (6) are provided with a contact fixing end (601) and a conductive piece fixing end (602) of a rigid conductor;

The contact piece fixing end (601) is fixedly communicated with the contact piece (1);

the fixed end (602) of the conductive piece is fixedly conducted with the conductive piece (7);

The contact fixing end (601) and the conductive piece fixing end (602) are connected and conducted with each other through the upper flexible section (603) and the lower flexible section (604) of the two flexible conductors.

3. A moulded case circuit breaker conductive circuit according to claim 1, wherein the contact (1) comprises a contact section (101), a conductive section (102), a movable end (103);

a contact groove (104) of the fixed contact (2) is arranged on the contact section (101); the contact section (101) is provided with an assembly hole (105) for installing the protective cover (5);

A rotating hole (109) is formed in the middle of the movable end (103);

A fixed groove (106) coupled with the contact fixed end (601) is formed in one side, close to the flexible connection (6), of the movable end (103); an arc-shaped upper supporting surface (107) is arranged on the upper side of the fixed groove (106); the lower side of the fixed groove (106) is provided with a circular arc-shaped lower supporting surface (108);

An elastic piece acting groove (110) for installing the elastic piece (9) is formed in one side, close to the rotating shaft (3), of the movable end (103);

The movable end (103) is connected and conducted with the contact section (101) through the natural transition of the conductive section (102).

4. A moulded case circuit breaker conductive circuit according to claim 1, wherein the protective cover (5) is provided with contact segment protection tabs (504) coupled with contact segments (101) on the contact (1);

side protection sheets (501) matched with the contact section (101) are arranged on two sides of the contact section protection sheet (504); the side protection piece (501) is provided with a mounting hole (506) corresponding to the mounting hole (105) on the contact section (101);

The contact section protection sheet (504) is close to one side of the conductive section (102) of the contact sheet (1) and extends in a natural transition manner to form a conductive section protection tongue (505);

The contact section protection sheet (504) is close to one side of the contact groove (104) of the contact sheet (1), and a notch contact hole (503) for fixedly mounting the contact (2) is reserved.

5. A moulded case circuit breaker conductive circuit according to claim 1, wherein the outer housing (4) forms an internally hollow rotor cavity (401) and an arc extinguishing cavity (405) from an inner housing (403) at the upper part and a bottom housing (404) at the lower part and a side wall envelope;

the rotor cavity (401) is positioned in the middle of the shell (4); the rotor cavity (401) is coupled with the rotating shaft (3);

The bottom shell (404) is provided with a circular arc-shaped bearing surface (402) at a position close to and facing the fixed end (602) of the conductive piece of the flexible connection (6);

the bottom shell (404) and the bearing surface (402) are coupled with a lower flexible section (604).

6. A conductive circuit of a molded case circuit breaker according to claim 1, wherein a connecting section (701) which is fixedly connected and conducted with the soft connection (6) is arranged on one side of the conductive member (7) close to the soft connection (6);

The connecting section (701) is provided with a circular arc-shaped supporting surface (705) at a position close to and facing the flexible connection (6);

The inner shell (403) and the support surface (705) are coupled with the flexible section (603).