CN215869248U - Modular single-breakpoint contact device - Google Patents

Abstract

The utility model discloses a modularized single-breakpoint contact device which comprises an installation shell, and a moving contact, a static contact, a rotating shaft and a magnetism increasing block which are arranged in the installation shell, wherein an inclined plane and a second bending part in the static contact are connected with a second horizontal plane to form a U-shaped structure, so that excessive cutting of materials of the static contact is avoided, the current carrying area is effectively ensured, and the service life of parts is prevented from being influenced by overhigh temperature rise; one part of the U-shaped structure is in a current reversal direction with the moving contact, the length of the current reversal part is longer, and the moving contact is acted by the electric force of the part, so that the opening speed and the opening distance can be increased; the current reverse part of the moving contact forms an acute angle with the inclined plane and the third horizontal plane of the static contact, so that the opening distance between the moving contact and the static contact can be increased when the moving contact and the static contact are separated; the U-shaped magnetism increasing block is arranged in the middle of the U-shaped structure of the static contact, so that the transfer speed of the electric arc can be increased.

Description

Modular single-breakpoint contact device

Technical Field

The utility model relates to a low-voltage molded case circuit breaker, in particular to a modular single-breakpoint contact device.

Background

The plastic case circuit breaker can cut off the circuit and protect the safety of equipment and personnel when the circuit has short circuit and overload faults. In the above two faults, the short-circuit fault current is large and serious in harm, and particularly when an abnormal short-circuit current occurs in a circuit, the short-circuit current is larger and serious in harm than the normal short-circuit current, so that a large opening distance is required between the moving contact and the static contact in order to quickly and reliably break the short-circuit current. And if the current-carrying capacity of the contact is not enough when the circuit breaker is in normal use, the temperature rise is too high, and the service life of parts is influenced. When the circuit breaker operates under such an excessive temperature rise for a long time, the circuit breaker can be burnt or more serious safety accidents can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a modular single-breakpoint contact device for solving the technical problems in the background art.

The technical scheme adopted by the utility model for solving the technical problems is as follows:

a modularized single-breakpoint contact device comprises a first shell and a second shell which are symmetrically assembled to form an installation shell, wherein the left side and the right side of the installation shell are respectively provided with a wire outlet end and a wire inlet end, a rotating shaft is arranged in the installation shell, a movable contact is movably connected onto the rotating shaft, a fixed contact is arranged at the lower end of the installation shell close to the wire inlet end, two sides of the fixed contact are provided with magnetizing blocks, the fixed contact comprises a first horizontal plane, a first bending part, a second horizontal plane, a second bending part, an inclined plane and a third horizontal plane, one end of the first horizontal plane extends out of the installation shell, and the other end of the first horizontal plane is bent downwards to form a first bending part; the second horizontal plane is positioned at the lower end of the first horizontal plane, one end of the second horizontal plane is connected with the first bending part, the other end of the second horizontal plane is bent upwards to form a second bending part, and limiting bosses are arranged on the side walls of the front end and the rear end of the second horizontal plane; the other end of the second bending part is connected with the inclined plane, the inclined plane inclines towards a second horizontal plane, a space is reserved between the inclined plane and the first bending part, and the end part of the inclined plane is connected with a third horizontal plane; the first fold width W1 is greater than the second fold width W2; and the upper end surface of the inclined surface is provided with a static contact, and the moving contact moves downwards along the rotating shaft and is in contact with the static contact.

Furthermore, the magnetism increasing block comprises a horizontal part arranged between the inclined surface and the second horizontal surface, the front end and the rear end of the horizontal part are respectively provided with a vertical surface in an upward mode, and the horizontal part is connected with the vertical surfaces to form a U-shaped structure.

Furthermore, the right side end of the moving contact is an arc striking pin, the lower end of the arc striking pin is provided with a moving contact, the left side of the moving contact is provided with a moving center movably connected with the rotating shaft, the moving contact moves up and down along the rotating shaft, and the moving contact is in contact with the fixed contact.

Further, when the movable contact is in contact with the fixed contact, the bottom surface of the movable contact is attached to the upper end surface of the fixed contact.

Furthermore, a second containing cavity used for installing the rotating shaft is arranged in the first shell, a limiting surface used for limiting the upward movement of the moving contact is arranged on the side, close to the wire inlet end, of the top of the first shell, and a first containing cavity used for installing the static contact is arranged on the side, close to the wire inlet end, of the lower end of the first shell.

Furthermore, a clamping groove with the size matched with the limiting boss is formed in the first accommodating cavity, and the limiting boss is clamped in the clamping groove.

Compared with the prior art, the utility model has the beneficial effects that:

1. the second horizontal plane, the second bending part and the inclined plane in the static contact are connected to form a U-shaped structure, so that the static contact material is not cut too much, the current carrying area can be effectively ensured, and the influence of overhigh temperature rise on the service life of parts is avoided;

2. one part of the U-shaped structure is in a current reversal direction with the moving contact, the length of the current reversal part is longer, and the moving contact is acted by the electric force of the part, so that the opening speed and the opening distance can be increased;

3. the current reverse part of the moving contact forms an acute angle with the inclined plane and the third horizontal plane of the static contact, and the opening distance between the moving contact and the static contact, namely the minimum distance between the moving contact and the static contact, can be increased when the moving contact and the static contact are separated. The arc can be rapidly elongated, the longer the arc is, the more the number of the grid pieces are contacted, so that the arc is cut into more arc sections, the arc quenching speed is higher, and the effect is better;

4. the magnetizing block comprises a horizontal part arranged between the inclined surface and a second horizontal surface, the front end and the rear end of the horizontal part are respectively provided with a vertical surface upwards, and the horizontal part and the vertical surfaces are connected to form a U-shaped structure;

5. the width W1 of the static contact from the first horizontal plane to the second horizontal plane is consistent, the width W2 from the second horizontal plane to the inclined plane is slightly narrowed, namely W1 is larger than W2, but the current-carrying capacity is not influenced by the narrowed part, and the structure effectively ensures the current-carrying area of the static contact so as to ensure that the temperature rise of the breaker in use reaches the use standard.

Drawings

FIG. 1: the utility model has an integral structure;

FIG. 2: the structure diagrams of the shell on one side and the half U-shaped magnetism increasing block are taken off;

FIG. 3: the utility model takes off the structure diagram of the shell on one side;

FIG. 4: a schematic structure of the shell;

FIG. 5: the structure diagram of the static contact of the utility model;

FIG. 6: the structure diagram of the moving contact of the utility model;

1. the device comprises a first shell, a second shell, a third shell, a fourth shell, a fifth shell, a sixth shell, a fourth shell, a sixth shell, a fourth shell, a sixth shell, a fourth shell, a sixth shell, a fourth shell, a sixth shell, a fourth shell, a sixth horizontal plane, a fourth shell, a sixth horizontal plane, a fourth shell, a sixth horizontal plane, a fourth.

Detailed Description

In order to facilitate an understanding of the utility model, the utility model will now be described more fully hereinafter with reference to the accompanying drawings, in which several embodiments of the utility model are shown, but which may be embodied in different forms and not limited to the embodiments described herein, but which are provided so as to provide a more thorough and complete disclosure of the utility model.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may be present, and when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present, as the terms "vertical", "horizontal", "left", "right" and the like are used herein for descriptive purposes only.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and the knowledge of the terms used herein in the specification of the present invention is for the purpose of describing particular embodiments and is not intended to limit the present invention, and the term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.

In an embodiment, referring to fig. 1-3, a modular single-breakpoint contact device includes a first housing 1 and a second housing 5, which are symmetrically assembled to form an installation shell, where the left and right sides of the installation shell are respectively an outgoing line end and an incoming line end, a rotating shaft 4 is disposed in the installation shell, a moving contact 3 is movably connected to the rotating shaft 4, a fixed contact 2 is disposed at a lower end of the installation shell near the incoming line end, and magnetizing blocks 6 are disposed at two sides of the fixed contact 2. The first horizontal surface 21 of the stationary contact 2 extends out of the outlet end of the housing for connection to a circuit. The moving contact 3 is located above the static contact 2, and is installed in the cavity of the rotating shaft 4 to form elastic connection with the rotating shaft 4. During normal action, the rotating shaft 4 and the moving contact 3 move up and down together under the driving of the operating mechanism. When abnormal short-circuit current occurs, as shown in the arrow direction in fig. 2, the moving contact 3 can move upward around the rotation center on the rotation shaft under the action of the electromotive force of the current in the direction opposite to that of the static contact 2, and is opened to a certain distance quickly. At this time, the mechanism is not operated, so the rotating shaft is not operated. The reversed current part has longer size, can effectively improve the repulsion speed and distance of the moving contact, and has an acute angle structure with the inclined surface 25 of the static contact, so that the opening distance H between the moving contact and the static contact can be effectively increased. When the breaker mechanism is operated, the movable contact 3 is operated to the highest position, as shown in fig. 3, and the maximum opening distance H is obtained between the movable contact 3 and the fixed contact 2.

The magnetic increasing block 6 includes a horizontal portion 61 disposed between the inclined surface 25 and the second horizontal surface 23, the horizontal portion 61 is provided with vertical surfaces 62 at front and rear ends thereof, and the horizontal portion 61 and the vertical surfaces 62 are connected to form a U-shaped structure.

As shown in fig. 4, the static contact includes a first horizontal surface 21, a first bending portion 22, a second horizontal surface 23, a second bending portion 24 and an inclined surface 25, one end of the first horizontal surface 21 extends out of the mounting housing, the other end of the first horizontal surface is bent downward to form the first bending portion 22, the second horizontal surface 23 is located at the lower end of the first horizontal surface 21, one end of the second horizontal surface is connected to the first bending portion 22, the other end of the second horizontal surface is bent upward to form the second bending portion 24, the other end of the second bending portion 24 is connected to the inclined surface 25, the inclined surface 25 is inclined toward the second horizontal surface 23, a gap is formed between the inclined surface 25 and the first bending portion 22, and a gap is formed between the second horizontal surface 23, and an acute angle is formed between the inclined surface 25 and the second horizontal surface 23. As shown by the arrow in fig. 2, when the current is applied, the direction of the current is opposite to the direction of the current of the movable contact, and the length L of the inclined surface 25 is long, such a reverse current can increase the repulsion speed and the repulsion distance of the movable contact 3 when the movable contact and the stationary contact are attached. The upper end surface of the inclined surface 25 is provided with a stationary contact 231, the movable contact 3 moves downwards along the rotating shaft 4 and contacts with the stationary contact 231, and the side walls of the front end and the rear end of the second horizontal surface 23 are provided with limiting bosses 221.

Preferably, the width W1 of the static contact 2 from the first horizontal plane 21 to the second horizontal plane 23 is uniform, and the width W2 from the second horizontal plane 23 to the inclined plane 25 is slightly narrowed, i.e., W1 > W2, but the narrowed portion does not affect the current-carrying capacity. The structure effectively ensures the current carrying area of the static contact 2 so as to ensure that the temperature rise of the breaker in use reaches the use standard.

Preferably, the fixed contact 2 is provided with a fixed contact insulating cover, the fixed contact 2 is wrapped inside the insulating cover, and the U-shaped magnetism increasing block 6 is also wrapped in the insulating cover, so that arc discharge and burning loss when the fixed contact 2 and the magnetism increasing block 6 generate electric arcs can be prevented, and arc extinction is not facilitated.

As shown in fig. 3, a second accommodating cavity 13 for installing the rotating shaft 4 is provided in the housing 1, a limiting surface 11 for limiting the upward movement of the movable contact 3 is provided at the top of the housing 1 near the wire inlet end, and a first accommodating cavity 12 for installing the static contact 2 is provided at the lower end of the housing 1 near the wire inlet end. A clamping groove 121 with the size matched with the limiting boss 221 is formed in the first accommodating cavity 12, the limiting boss 221 is clamped in the clamping groove 121 to play a limiting role, and the static contact 2 is fixed to enable the static contact to be stable in structure.

As shown in fig. 5, the right end of the movable contact 3 is an arc striking pin 33, the lower end of the arc striking pin 33 is provided with a movable contact 31, the left side of the movable contact 3 is provided with a movable center 32 movably connected with the rotating shaft 4, and the movable contact 3 moves up and down along the rotating shaft 4. When the movable contact moves downward, the movable contact 31 provided at the lower end of the arc runner 33 contacts the stationary contact 231. When the movable contact 31 contacts the fixed contact 231, the bottom surface of the movable contact 31 is attached to the upper end surface of the fixed contact 231.

The utility model is described above with reference to the accompanying drawings, it is obvious that the utility model is not limited to the above-described embodiments, and it is within the scope of the utility model to adopt such insubstantial modifications of the inventive method concept and solution, or to apply the inventive concept and solution directly to other applications without modification.

Claims (6)

1. A modularized single-breakpoint contact device comprises a mounting shell formed by symmetrically assembling a first shell (1) and a second shell (5), wherein the left side and the right side of the mounting shell are respectively provided with a wire outlet end and a wire inlet end, a rotating shaft (4) is arranged in the mounting shell, a movable contact (3) is movably connected onto the rotating shaft (4), the lower end of the mounting shell close to the wire inlet end is provided with a static contact (2), and the two sides of the static contact (2) are provided with magnet increasing blocks (6), and the modularized single-breakpoint contact device is characterized in that one end of the first horizontal plane (21) extends out of the mounting shell, the other end of the first horizontal plane (21) is bent downwards to form a first bent part (22);

the second horizontal plane (23) is positioned at the lower end of the first horizontal plane (21), one end of the second horizontal plane is connected with the first bending part (22), the other end of the second horizontal plane is bent upwards to form a second bending part (24), and limiting bosses (221) are arranged on the side walls of the front end and the rear end of the second horizontal plane (23);

the other end of the second bending part (24) is connected with the inclined surface (25), the inclined surface (25) inclines towards a second horizontal plane (23), a space is reserved between the inclined surface (25) and the first bending part (22) and the second horizontal plane (23), and the end part of the inclined surface (25) is connected with a third horizontal plane (26);

the width W1 of the first bend (22) is greater than the width W2 of the second bend (24);

and a static contact (231) is arranged on the upper end surface of the inclined surface (25), and the movable contact (3) moves downwards along the rotating shaft (4) and is in contact with the static contact (231).

2. The modular single-break-point contact device as claimed in claim 1, wherein the magnetism increasing block (6) comprises a horizontal part (61) arranged between the inclined surface (25) and the second horizontal surface (23), the front end and the rear end of the horizontal part (61) are respectively provided with an upright surface (62) upwards, and the horizontal part (61) and the upright surfaces (62) are connected to form a U-shaped structure.

3. The modular single-break contact device as claimed in claim 1, wherein the right end of the movable contact (3) is an arc-striking pin (33), the lower end of the arc-striking pin (33) is provided with a movable contact (31), the left side of the movable contact (3) is provided with a movable center (32) movably connected with the rotating shaft (4), the movable contact (3) moves up and down along the rotating shaft (4), and the movable contact (31) is in contact with the stationary contact (231).

4. A modular single-break contact device as claimed in claim 3, wherein when said movable contact (31) is in contact with said stationary contact (231), the bottom surface of said movable contact (31) is in contact with the upper end surface of said stationary contact (231).

5. The modular single-breakpoint contact device according to claim 1, wherein a second accommodating cavity (13) for installing the rotating shaft (4) is formed in the first housing (1), a limiting surface (11) for limiting the upward movement of the movable contact (3) is arranged on the side, close to the wire inlet, of the top of the first housing (1), and a first accommodating cavity (12) for installing the static contact (2) is arranged on the side, close to the wire inlet, of the lower end of the first housing (1).

6. The modular single-break contact device as claimed in claim 5, wherein a slot (121) having a size matched with the limit boss (221) is arranged in the first cavity (12), and the limit boss (221) is clamped in the slot (121).

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