A large-pitch double-break circuit breaker

Abstract

This invention provides a large-pitch double-break circuit breaker, comprising: a contact assembly disposed on a housing, including a moving contact and a stationary contact, wherein the stationary contact and the moving contact can make or break contact; and a contact cover disposed on the stationary contact, having a gas guiding channel capable of generating gas and blowing the arc toward the arc extinguishing assembly. This circuit breaker improves the arc ignition force and arc blowing force, thereby effectively improving the arc extinguishing efficiency.

Description

Technical Field

[0001] This invention relates to the field of low-voltage power distribution, and specifically to a large-opening-distance double-break circuit breaker. Background Technology

[0002] Currently, circuit breakers on the market are equipped with arc-extinguishing chambers for extinguishing arcs. The arc enters the arc-extinguishing chamber from the point where the moving contact and the stationary contact make contact. The arc-extinguishing chamber is simply composed of several arc-extinguishing grids and an arc-extinguishing cover that encloses all the arc-extinguishing grids. Under the impetus of the magnetic field and fluid effect in the arc-extinguishing chamber, the arc is separated into multiple short arcs by multiple arc-isolating grids, thus achieving the effect of arc extinguishing. However, the arc extinguishing effect achieved by this method is generally not very good. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to overcome the defect that the arc extinguishing effect of the arc extinguishing chamber in the prior art is generally poor, so as to provide a large-pitch double-break circuit breaker with good arc extinguishing effect.

[0004] Therefore, the present invention provides a large-pitch double-break circuit breaker, including a contact assembly disposed on a housing, including a moving contact and a stationary contact, wherein the stationary contact and the moving contact can make contact or break apart;

[0005] The contact cover, located on the stationary contact, has a gas-guiding channel that can generate gas and blow the arc toward the arc-extinguishing assembly.

[0006] Furthermore: the arc extinguishing assembly includes an arc extinguishing grid, an arc extinguishing chamber for accommodating the arc extinguishing grid, and an air outlet communicating with the arc extinguishing chamber. The contact cover has a blocking surface and a guiding surface. The guiding surface is used to accelerate the gas blowing arc into the arc extinguishing chamber, and the blocking surface is used to prevent gas backflow.

[0007] Furthermore: the blocking surface is a vertical surface, and the air guiding surface is an inclined air guiding surface extending toward the arc-extinguishing chamber.

[0008] Furthermore: the air guiding channel is provided with an arc-inducing angle, and the arc-inducing angle is provided with a slot and an arc-inducing plate. The arc-inducing plate is locked inside the slot and fits against the inclined surface of the air guiding channel. The arc-inducing plate is used to guide the air blowing direction toward the arc-extinguishing chamber.

[0009] Furthermore, a slot is provided at the arc-starting plate, and the slot engages with the arc-starting plate.

[0010] Furthermore: the stationary contact is provided with a contact point for contacting the moving contact, and the side wall of the housing has an air-blocking rib extending therefrom to prevent airflow and arc backflow.

[0011] Furthermore: a flared opening is formed between the air-blocking rib and the arc-guiding plate.

[0012] Furthermore, the stationary contact is provided with a silver coating for sealing the bottom of the air passage, and the silver coating covers the outside of the contact.

[0013] Furthermore, the contact cover is provided with reinforcing ribs to prevent the contact cover from cracking.

[0014] Furthermore: the stationary contact includes an extension section, a bending section, and a connecting section, the contact point is disposed at the connecting section, and the connecting section is disposed adjacent to the upper or lower panel of the housing.

[0015] The technical solution of this invention has the following advantages:

[0016] 1. The large-pitch double-break circuit breaker provided by the present invention has a contact cover that serves two purposes: firstly, it shields the stationary contact to prevent it from being burned due to arc erratic movement; secondly, since the contact cover is made of a gas-generating material, it can generate a large amount of gas. Furthermore, due to the arrangement of the gas guiding channel, when the moving and stationary contacts are broken, the gas guiding channel can generate gas and push the arc towards the arc-extinguishing chamber. This reduces arc stagnation and accelerates the time it takes for the arc to enter the arc-extinguishing grid, thereby improving the arc-extinguishing effect.

[0017] 2. The large-pitch double-break circuit breaker provided by the present invention has an inclined surface and a vertical surface on the contact cover. The vertical surface can prevent gas backflow, while the inclined surface can accelerate the gas blowing to the arc-extinguishing chamber, thereby improving the gas blowing speed.

[0018] 3. The large-pitch double-break circuit breaker provided by the present invention can effectively guide the air blowing direction toward the arc extinguishing chamber through the setting of the arc-initiating plate.

[0019] 4. The large-spacing double-break circuit breaker provided by the present invention has air-blocking ribs on the side wall of the receiving cavity, which can effectively prevent airflow and arc backflow.

[0020] 5. The large-spacing double-break circuit breaker provided by the present invention has an air-blocking rib and an arc-starting plate forming a flared mouth, which sandwiches the arc-extinguishing chamber in the middle, which is beneficial for arc blowing and arc ignition. Attached Figure Description

[0021] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall structure of the large-opening-pitch double-break circuit breaker.

[0023] Figure 2 for Figure 1A three-dimensional structural diagram of the removal of the moving contact;

[0024] Figure 3 for Figure 1 A schematic diagram of the three-dimensional structure from another angle;

[0025] Figure 4 for Figure 1 A three-dimensional structural diagram of the contact cover removed;

[0026] Figure 5 This is a three-dimensional structural diagram of the contact cover;

[0027] Figure 6 This is a diagram showing the positional relationship between the contact cover and the arc-extinguishing grid.

[0028] Figure 7 This is a three-dimensional structural diagram of the other side of the contact cover;

[0029] Figure 8 This is a schematic diagram of the cross-sectional structure of the contact cover.

[0030] Reference numerals: 1. Contact assembly; 11. Moving contact; 12. Stationary contact; 13. Contact point; 2. Housing; 3. Contact cover; 31. Air guide channel; 32. Blocking surface; 33. Air guide surface; 4. Arc extinguishing assembly; 41. Arc extinguishing grid; 42. Arc extinguishing chamber; 43. Air outlet; 5. Slot; 51. Arc ignition plate; 6. Air baffle; 61. Silver coating; 7. Reinforcing rib; 8. Extension section; 81. Bending section; 82. Connecting section. Detailed Implementation

[0031] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0033] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Example

[0036] This embodiment provides a large-pitch double-break circuit breaker, including a contact assembly 1 disposed on a housing 2, including a moving contact 11 and a stationary contact 12, which can make or break contact with each other; and a contact cover 3 disposed on the stationary contact 12, which has a gas guiding channel 31 that can generate gas and blow the arc toward the arc extinguishing assembly 4.

[0037] The specific improvements mentioned above are as follows: Figure 1 As shown: A moving contact 11 and a stationary contact 12 are provided inside the housing 2. The stationary contact 12 is fixedly installed inside the housing 2. When energized, the moving contact 11 is inserted into the contact cover 3 and connected to the stationary contact 12. When the electrical appliance is disconnected, the moving contact 11 will separate from the stationary contact 12. During the separation process, a large number of electric arcs are generated. During the generation of electric arcs, the temperature of the contact cover 3 rises, generating a large amount of gas. The gas pushes the electric arc into the arc-extinguishing chamber 42. This is superior to the existing technology. After the disconnection process, the gas generated by the contact cover 3 pushes the electric arc into the arc-extinguishing chamber 42, thereby increasing the arc-extinguishing efficiency.

[0038] Based on the above embodiments: the arc extinguishing assembly 4 includes an arc extinguishing grid plate 41, an arc extinguishing chamber 42 for accommodating the arc extinguishing grid plate 41, and an air outlet 43 connected to the arc extinguishing chamber 42. The contact cover 3 is provided with a blocking surface 32 and a guiding surface 33. The guiding surface 33 is used to accelerate the gas blowing arc into the arc extinguishing chamber 42, and the blocking surface 32 is used to prevent the gas from retreating.

[0039] The specific improvements mentioned above are as follows: Figure 1 As shown: After the circuit breaker is disconnected, the electric arc quickly enters the arc-extinguishing chamber 42 due to the air blowing effect of the contact cover 3, and is then extinguished by the arc-extinguishing grid plate 41. Finally, the gas is discharged through the air outlet 43.

[0040] The specific improvements mentioned above are as follows: Figures 5-8As shown: The contact cover 3 is provided with a blocking surface 32 and a gas guiding surface 33. The blocking surface 32 can effectively block the gas from retreating, and the gas guiding surface 33 can be set at an angle to effectively accelerate the gas blowing arc into the arc extinguishing chamber 42.

[0041] Based on the above embodiments: the air guiding channel 31 is provided with an arc-inducing angle, a slot 5 is provided at the arc-inducing angle, an arc-inducing piece 51 is provided at the arc-inducing angle, the arc-inducing piece 51 is engaged in the slot 5, the arc-inducing piece 51 is in contact with the air guiding inclined surface, and the arc-inducing piece 51 is used to guide the air blowing direction toward the arc extinguishing chamber 42.

[0042] The specific improvements mentioned above are as follows: Figure 6 As shown: a slot 5 is provided in the gas guiding channel 31. The shape of the arc ignition piece 51 provided in the slot 5 is in contact with the gas guiding inclined surface. The function of the arc ignition piece 51 is to effectively guide the electric arc into the arc extinguishing chamber 42. The arc ignition piece 51 is locked in the slot of the contact cover, which has the advantages of simple structure and quick and convenient assembly.

[0043] Based on the above embodiments: the stationary contact 12 is provided with a contact point 13, which is used to contact the stationary contact 12.

[0044] The specific improvements mentioned above are as follows: Figure 4 As shown: Contact 13 is disposed on stationary contact 12 and contacts moving contact 11. Contact 13 can be made of a highly conductive metal material.

[0045] Based on the above embodiments: an air-blocking rib 6 extends from the side wall of the housing 2 to prevent airflow and arc backflow, and a flared opening is formed between the air-blocking rib 6 and the arc-inducing plate 51.

[0046] The specific improvements mentioned above are as follows: the air baffle 6 and the arc-starting plate form a flared opening, sandwiching the arc-extinguishing chamber 42 in the middle, which is beneficial for arc starting and arc blowing.

[0047] Based on the above embodiments: a silver coating 61 for sealing the air passage 31 is provided at the stationary contact 12, and the silver coating 61 covers the outside of the contact 13.

[0048] The specific improvements mentioned above are as follows: the contact 13 is covered with a silver film, or the entire contact 13 is made of silver material. The contact 13 can provide good conductivity; the other is to seal the gas channel 31 at one end where the contact 13 is located (sealing means that the area of ​​the contact almost occupies the bottom position of the gas channel 31), so that one end of the gas channel 31 is sealed. After the break, the contact cover 3 generates gas, the gas pressure at one end of the contact 13 increases, and the gas pressure at the arc-extinguishing chamber 42 is lower than the gas pressure at the contact 13. Thus, the gas pressure generated by the contact cover 3 can push the arc towards the arc-extinguishing chamber 42.

[0049] Based on the above embodiments: the contact cover 3 is provided with reinforcing ribs 7 to prevent the contact cover 3 from cracking.

[0050] The specific improvement mentioned above is that by setting the reinforcing rib 7, it is possible to effectively prevent the contact cover 3 from being cracked by the airflow.

[0051] Based on the above embodiments: the stationary contact 12 includes an extension section 8, a bending section 81 and a connecting section 82, wherein the connecting section 82 is disposed adjacent to the upper panel or lower panel of the housing 2.

[0052] The specific improvements mentioned above are as follows: Figures 1-4 As shown: The stationary contact 12 includes an extension section 8, a bending section 81, and a connecting section 82. The contact is located at the position of the connecting section 82, which is located at the upper or lower panel of the housing 2. This can double the original opening distance to meet the high voltage breaking requirements.

[0053] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A large-opening-pitch double-break circuit breaker, characterized in that: include The contact assembly (1) is disposed on the housing (2) and includes a moving contact (11) and a stationary contact (12), which can make or break contact with each other; The contact cover (3) is provided on the stationary contact (12) and has a gas channel (31) that can generate gas and blow the arc toward the arc extinguishing assembly (4); The arc extinguishing assembly (4) includes an arc extinguishing grid plate (41), an arc extinguishing chamber (42) for accommodating the arc extinguishing grid plate (41), and an air outlet (43) connected to the arc extinguishing chamber (42). The contact cover (3) has a blocking surface (32) and a gas guiding surface (33). The gas guiding surface (33) is used to accelerate the gas blowing arc into the arc extinguishing chamber (42), and the blocking surface (32) is used to prevent the gas from retreating. The blocking surface (32) is a vertical surface, and the air guiding surface (33) is an inclined air guiding surface extending toward the arc extinguishing chamber (42); The stationary contact (12) is provided with a contact point (13), which is used to contact the moving contact (11). The side wall of the housing (2) is provided with a baffle rib (6) to prevent airflow and arc backflow. The stationary contact (12) is provided with a silver coating for sealing the bottom of the air channel (31), and the silver coating covers the outside of the contact (13).

2. The large-pitch double-break circuit breaker according to claim 1, characterized in that: The air guiding channel (31) is provided with an arc-inducing angle inside. A slot (5) and an arc-inducing plate (51) are provided at the arc-inducing angle. The arc-inducing plate (51) is inserted into the slot (5) and fits against the air guiding inclined surface. The arc-inducing plate (51) is used to guide the air blowing direction toward the arc-extinguishing chamber (42).

3. A large-pitch double-break circuit breaker according to claim 2, characterized in that: A slot (5) is provided at the arc-initiating piece, and the slot (5) engages with the arc-initiating piece (51).

4. A large-pitch double-break circuit breaker according to claim 3, characterized in that: A flared opening is formed between the air-blocking rib (6) and the arc-drawing plate (51).

5. A large-pitch double-break circuit breaker according to claim 4, characterized in that: The contact cover (3) is provided with reinforcing ribs (7) to prevent the contact cover (3) from cracking.

6. A large-pitch double-break circuit breaker according to claim 5, characterized in that: The stationary contact (12) includes an extension section (8), a bending section (81), and a connecting section (82). The contact point (13) is located at the connecting section (82), which is located adjacent to the upper or lower panel of the housing (2).

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