Arc isolation structure of circuit breaker

Abstract

The utility model discloses an arc isolating structure of a circuit breaker. The circuit breaker mainly solves the problem that gas generated when a conventional circuit breaker is broken cannot well enter an arc extinguish chamber. The circuit breaker is characterized in that the circuit breaker further comprises an arc guide cover (5), the static contact is arranged in the arc guide cover, the arc guide cover is provided with a first open slot (51) and a second open slot (52), the first open slot faces an inlet of the arc extinguish chamber, and the second open slot is used for the moving contact to extend into and be matched with the static contact for use; and the baffle plate is arranged in the shell and is oppositely arranged on at least one side of the edge of the second open slot and / or above the second open slot. The utility model provides an arc isolating structure of a circuit breaker, which is provided with an arc guide cover, and a plurality of baffle plates are arranged at the position of an open slot for moving of a moving contact, so that on one hand, the possibility of upward exhausting of gas is reduced, and on the other hand, a high-voltage area is formed, and the gas can enter an arc extinguish chamber downwards.

Description

Technical Field

[0001] The utility model relates to the field of circuit breakers, in particular to an arc isolation structure of a circuit breaker. Background Art

[0002] Miniature circuit breakers have the characteristics of advanced structure, reliable performance, strong breaking capacity, beautiful and compact appearance, etc. They are used for overload and short-circuit protection of lighting, distribution lines and equipment in office buildings, residential buildings and similar buildings, and can also be used for infrequent on-off operation and conversion of lines.

[0003] In order to increase the arc guiding effect, most conventional circuit breaker housings are equipped with arc guiding channels, which are open. When the moving contact and the static contact are separated, relatively high-temperature gas will be generated. Since there is no obstruction on the moving contact and the static contact in the upper and lower directions, some gas cannot enter the arc extinguishing chamber well to extinguish the arc. Utility Model Content

[0004] In order to overcome the shortcomings of the background technology, the utility model provides an arc isolation structure of a circuit breaker, which mainly solves the problem that the gas generated when the conventional circuit breaker is disconnected cannot enter the arc extinguishing chamber well.

[0005] The technical solution of the utility model is:

[0006] An arc-isolating structure for a circuit breaker comprises a shell, wherein a static contact, a moving contact and an arc-extinguishing chamber are arranged in the shell, and further comprises an arc-guiding cover, wherein the static contact is arranged in the arc-guiding cover, and the arc-guiding cover is provided with a first opening groove and a second opening groove, wherein the first opening groove faces the entrance of the arc-extinguishing chamber, and the second opening groove is used for the moving contact to extend into and cooperate with the static contact; a baffle is arranged in the shell, at least one side of the edge of the second opening groove and / or above the second opening groove relative to the baffle.

[0007] The baffle includes a first baffle, one end of the second opening groove is arranged on the top end surface of the arc guide cover, and the first baffle is arranged on the top end surface of the arc guide cover and on the edge of the second opening groove.

[0008] The baffle includes a second baffle and a lock buckle rotatably arranged in the shell. The second baffle is arranged on the surface of the lock buckle opposite to the second opening groove, and the second baffle is correspondingly arranged above the second opening groove.

[0009] Magnetic conductive sheets are arranged on the outer walls of both sides of the arc guide cover.

[0010] An air inlet is provided on at least one side of the outer wall of the arc guide hood, and the air inlet is used for gases with lower temperatures on both sides of the arc extinguishing chamber to enter the arc guide hood.

[0011] The air inlet is arranged above the static contact.

[0012] The arc guide cover comprises a side plate, and a plurality of notches are arranged on the side plate. The notches are arranged opposite to the arc extinguishing chamber, and an air inlet channel is formed between the notches and the air inlet.

[0013] The arc extinguishing chamber comprises a plurality of arc extinguishing grids, through grooves are formed between the arc extinguishing grids, and the through grooves are arranged opposite to the notches.

[0014] The arc guide cover comprises a first cover body and a second cover body which are detachably connected.

[0015] An arc running channel with one end facing the moving contact and the other end facing the arc extinguishing chamber is arranged in the first cover body and / or the second cover body.

[0016] The beneficial effects of the utility model are as follows: the utility model provides an arc isolation structure of a circuit breaker, which is provided with an arc guide cover, and a plurality of baffles are arranged at the opening slot for the movement of the moving contact, which reduces the possibility of gas upward discharge on the one hand, and forms a high-pressure area on the other hand, which is conducive to the gas entering downward into the arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an internal stereoscopic schematic diagram of an embodiment of the utility model.

[0018] Figure 2 for Figure 1 A magnified schematic diagram of center A.

[0019] Figure 3 It is a partial three-dimensional schematic diagram of an embodiment of the utility model.

[0020] Figure 4 The figure is a three-dimensional schematic diagram of an arc guide cover according to an embodiment of the utility model.

[0021] Figure 5 The figure is a schematic diagram of an explosion of an arc guide cover according to an embodiment of the utility model.

[0022] Figure 6 It is a partial three-dimensional schematic diagram of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings: as shown in the figure, an arc isolation structure of a circuit breaker includes a shell 1, in which a static contact 2, a moving contact 3 and an arc extinguishing chamber 4 are arranged, and also includes an arc guide cover 5, in which the static contact is arranged, and the arc guide cover is provided with a first opening groove 51 and a second opening groove 52, the first opening groove faces the entrance of the arc extinguishing chamber, and the second opening groove is used for the moving contact to extend into and cooperate with the static contact; a baffle is arranged in the shell, relative to at least one side of the edge of the second opening groove and / or above the second opening groove.

[0024] The second opening groove is used for the moving contact to extend into and cooperate with the static contact, and provides corresponding space when the moving contact rotates. The first opening groove faces the arc extinguishing chamber, which is convenient for guiding the high-temperature and high-pressure gas generated during disconnection to the arc extinguishing chamber, and an opening is opened on the side wall for the static contact to extend into. The baffle is arranged at the second opening groove to effectively reduce the space above the second opening groove. On the one hand, it reduces the possibility of gas discharge, and on the other hand, it forms a high-pressure area, which is conducive to the gas entering downward into the arc extinguishing chamber.

[0025] In this embodiment, as shown in the figure, the baffle includes a first baffle 61, one end of the second opening slot is arranged at the top end surface of the arc guide cover, and the first baffle is arranged at the top end surface of the arc guide cover and at the edge of the second opening slot. The first baffle is arranged at the edge of the second opening slot to prevent gas from escaping from the side and more effectively push the arc to move toward the arc extinguishing chamber.

[0026] In this embodiment, as shown in the figure, the baffle includes a second baffle 62, and also includes a lock buckle 7 rotatably arranged in the housing, and the second baffle is arranged on the surface of the lock buckle opposite to the second opening slot, and the second baffle is correspondingly arranged above the second opening slot. The second baffle is arranged on the lock buckle, and when the circuit breaker is tripped, the second baffle will be arranged above the second opening slot, which is conducive to forming a local high voltage and more effectively pushing the arc to move toward the arc extinguishing chamber.

[0027] In this embodiment, as shown in the figure, the outer walls of both sides of the arc guide cover are provided with magnetic conductive sheets 53. The arc guide function is a prior art and will not be described in detail. The magnetic conductive sheet can be installed on the outer wall of the arc guide cover by means of clamping, etc. Specifically, a clamping block 50 can be provided on the arc guide cover to clamp the circumferential outer wall of the magnetic conductive sheet.

[0028] In this embodiment, as shown in the figure, an air inlet 54 is provided on at least one side of the outer wall of the arc guide cover, and the air inlet is used for the gas with lower temperature on both sides of the arc extinguishing chamber to enter the arc guide cover. After entering the arc extinguishing chamber, the high-temperature gas will be extinguished and cooled. A part of it will be discharged from the shell through the opening on the shell, and the other part will enter the air inlet through the through grooves on both sides of the arc extinguishing chamber to form a circulating airflow to cool the moving and static contacts, so as to avoid high temperature in the moving and static contact area and damage to the moving and static contacts. After passing through the moving and static contacts, the airflow will enter the arc extinguishing chamber again from the arc running channel. It should be noted that part of the airflow will flow out from the opening when breaking, but most of it will still enter the arc extinguishing chamber according to the flow path of the arc running channel. The feasibility of this product has been proved by airflow field simulation and experiments.

[0029] In this embodiment, as shown in the figure, the air inlet is arranged above the static contact.

[0030] In this embodiment, as shown in the figure, the arc guide cover includes a side plate 55, and a plurality of notches 551 are provided on the side plate. The notches are arranged opposite to the arc extinguishing chamber, and an air inlet channel 56 is formed between the notches and the air inlet. The gas in the arc extinguishing chamber is cooled by the arc extinguishing chamber, and then enters the notch through the air inlet channel to realize the flow of air.

[0031] In this embodiment, as shown in the figure, the arc extinguishing chamber includes a plurality of arc extinguishing grids, through grooves 41 are formed between the arc extinguishing grids, and the through grooves are arranged opposite to the notches.

[0032] In this embodiment, as shown in the figure, the arc guide cover comprises a detachably connected first cover body 501 and a second cover body 502. The first cover body and the second cover body can be opened in half, and the two can be fixed by means of a snap connection or a screw connection.

[0033] In this embodiment, as shown in the figure, the first cover body and / or the second cover body is provided with an arc running channel 503 with one end facing the moving contact and the other end facing the arc extinguishing chamber, which is beneficial for the gas to flow to the arc extinguishing chamber.

[0034] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0035] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0036] The embodiments described with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention. The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. An arc-isolating structure of a circuit breaker, comprising a housing (1), wherein a stationary contact (2), a moving contact (3) and an arc-extinguishing chamber (4) are arranged in the housing, characterized in that: Also includes An arc guide cover (5), wherein the static contact is arranged in the arc guide cover, and the arc guide cover is provided with a first opening groove (51) and a second opening groove (52), wherein the first opening groove faces the entrance of the arc extinguishing chamber, and the second opening groove is used for the moving contact to extend into and cooperate with the static contact; The baffle is arranged in the shell, and is arranged opposite to at least one side of the edge of the second opening slot and / or above the second opening slot.

2. The arc isolation structure of a circuit breaker according to claim 1, characterized in that: The baffle comprises a first baffle (61), one end of the second opening slot is arranged on the top end surface of the arc guide cover, and the first baffle is arranged on the top end surface of the arc guide cover and on the edge of the second opening slot.

3. The arc isolation structure of a circuit breaker according to claim 1 or 2, characterized in that: The baffle includes a second baffle (62) and a lock buckle (7) rotatably arranged in the shell, the second baffle is arranged on the surface of the lock buckle opposite to the second opening slot, and the second baffle is correspondingly arranged above the second opening slot.

4. The arc isolation structure of a circuit breaker according to claim 1, characterized in that: Magnetic conductive sheets (53) are provided on the outer walls of both sides of the arc guide cover.

5. The arc isolation structure of a circuit breaker according to claim 1, characterized in that: An air inlet (54) is provided on at least one outer wall of the arc guide hood, and the air inlet is used for gases with lower temperatures on both sides of the arc extinguishing chamber to enter the arc guide hood.

6. The arc isolation structure of a circuit breaker according to claim 5, characterized in that: The air inlet is arranged above the static contact.

7. The arc isolation structure of a circuit breaker according to claim 5, characterized in that: The arc guide cover comprises a side plate (55), on which a plurality of notches (551) are provided, the notches being arranged opposite to the arc extinguishing chamber, and an air inlet passage (56) being formed between the notches and the air inlet.

8. The arc isolation structure of a circuit breaker according to claim 7, characterized in that: The arc extinguishing chamber comprises a plurality of arc extinguishing grids, through grooves (41) are formed between the arc extinguishing grids, and the through grooves are arranged opposite to the notches.

9. The arc isolation structure of a circuit breaker according to claim 1, characterized in that: The arc guide cover comprises a first cover body (501) and a second cover body (502) which are detachably connected.

10. The arc isolation structure of a circuit breaker according to claim 9, characterized in that: An arc running channel (503) with one end facing the moving contact and the other end facing the arc extinguishing chamber is provided in the first cover body and / or the second cover body.

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