Structure for suppressing flashover

Abstract

The utility model relates to a structure for suppressing flashover, which is arranged in an electric arc deionization area in front of an air outlet of an arc extinguish chamber and comprises a plurality of deionization units arranged at certain intervals along the air outlet direction. Wherein the deionization unit closest to the gas outlet is provided with a porous structure, and the adjacent deionization unit is provided with a space blocking structure; the space blocking structure comprises an air blocking plate assembly for blocking airflow from flowing in the air outlet direction, and the air blocking plate assembly comprises an air blocking plate for enabling part of the airflow to generate reverse flow. Compared with the prior art, by adopting the internal and external multiple deionization units, the purpose of multiple arc suppression is achieved, the creepage path and distance of the arc are increased, and the insulation effect of the arc spraying opening is improved; the arc ejection speed is slowed down through the deionization unit with the space blocking structure, the arc energy is reduced, and the arc is restrained through the deionization unit with the porous structure.

Description

TECHNICAL FIELD

[0001] The utility model relates to a circuit breaker technical field especially is related to a structure of arc suppression. BACKGROUND

[0002] In the light storage power generation system and AC-DC distribution system, with the continuous progress of power supply network technology, the system capacity is getting larger and larger, the system voltage is continuously improved, and the space in the distribution cabinet is compact; At the same time, it is also required that the volume of the existing electrical device is continuously integrated and miniaturized, the short-circuit fault current breaking capacity is continuously improved, the arc flying generated when breaking abnormal current is also getting higher and higher, most of which can realize zero arc flying. The original conventional circuit breaker often adopts the way of adding arc cover to suppress and block the arc, which will greatly increase the size of the circuit breaker, reduce the economy and reliability of the distribution system; Or increase a simple arc suppression device in the circuit breaker, this scheme can reduce the arc flying distance, but it is also difficult to completely suppress the arc flying out of the circuit breaker. SUMMARY

[0003] The utility model discloses a structure of arc suppression, which overcomes the defects of the prior art, improves the arc suppression capability and realizes zero arc flying distance.

[0004] The utility model discloses a structure of arc suppression, which overcomes the defects of the prior art, improves the arc suppression capability and realizes zero arc flying distance.

[0005] A structure of arc suppression is arranged in the arc extinction chamber, including a plurality of arc suppression units arranged at intervals in the outflow direction, wherein the arc suppression unit closest to the outlet is provided with a porous structure, and the adjacent arc suppression units are provided with a space blocking structure; The space blocking structure includes a gas baffle assembly that blocks the flow of gas in the outflow direction, and the gas baffle assembly includes a gas baffle that causes a portion of the gas flow to flow in the opposite direction.

[0006] Further, the gas baffle assembly includes a first gas baffle and a second gas baffle arranged in sequence in the outflow direction, the first gas baffle divides the space into a plurality of passages, and the second gas baffle causes a portion of the gas flow passing through the first gas baffle to flow in the opposite direction and converge into a passage.

[0007] Further, the first gas baffle and the second gas baffle are respectively provided with two and arranged symmetrically along the axial direction.

[0008] Further, the first gas baffle and the second gas baffle are respectively provided with two and arranged symmetrically along the axial direction.

[0009] Further, the first gas baffle and the second gas baffle are respectively provided with two and arranged symmetrically along the axial direction.

[0010] Further, when the arc extinction region comprises two extinction units provided with porous structures, the gas outlet holes of the extinction unit close to the inside of the arc extinguishing chamber are larger than the gas outlet holes of the extinction unit close to the gas outlet.

[0011] Further, the arc extinction region comprises three extinction units, wherein the middle extinction unit is provided with a space blocking structure, and the other two extinction units are provided with porous structures.

[0012] Further, a limiting boss is arranged in the arc extinguishing chamber, and the arc extinguishing chamber is provided with an arc striking piece, and the limiting boss is arranged at the position where the end of the arc striking piece extends to the gas outlet.

[0013] Further, the arc extinguishing chamber is provided with two gas outlets, which are respectively arranged at the two ends of the arc extinguishing grid in the arc extinguishing chamber, and the arc extinction region in front of the two gas outlets is respectively provided with the arc flying suppression structure.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] 1. The utility model discloses a multiple extinction unit, which can achieve the purpose of multiple arc suppression, increase the arc creeping path and distance, and increase the insulation effect of the arc striking port.

[0016] 2. The extinction unit with the space blocking structure can slow down the arc ejection speed and reduce the arc energy, and then the extinction unit with the porous structure can achieve the purpose of arc suppression.

[0017] 3. The first gas baffle with the space blocking structure divides the airflow into multiple airflow paths, and the second gas baffle blocks part of the airflow to make the airflow converge into one path, and the blocked airflow is opposite to the original airflow path direction, which can offset part of the airflow and reduce the arc energy of the gas outlet.

[0018] 4. The arc extinction region of the utility model has a larger space distance than the existing arc extinction region, which can increase the space between the high potential of the arc striking piece and the low potential of the external grounding device, increase the creeping distance, and improve the arc cooling effect.

[0019] 5. The limiting boss arranged at the position matched with the arc striking piece on both sides of the arc extinguishing chamber can improve the positioning effect of the arc striking piece, facilitate the installation of the arc extinguishing chamber, increase the creeping distance between the arc striking piece and the grounding device on both sides, and reduce the breakdown of the arc striking piece and the grounding device. DRAWINGS

[0020] Figure 1 It is a schematic view of the arc flying suppression structure in the first embodiment.

[0021] Figure 2Schematic diagram of the principle of airflow passing through the air baffle assembly in Example 1;

[0022] Figure 3 It is a structural diagram of the limiting boss;

[0023] Figure 4 This is a schematic diagram of the structure for suppressing arcing in Example 3.

[0024] Reference numerals:

[0025] 1-arc extinguishing chamber; 2-arc extinguishing zone; 3-air outlet; 4-porous extinguishing unit; 5-external grounding device; 6-arc striking plate; 7-connecting terminal; 8-static contact; 9-limiting boss; 10-housing; 11-air baffle assembly; 12-first air baffle; 13-second air baffle. DETAILED DESCRIPTION

[0026] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0027] The arc dissociation area of ​​existing circuit breakers has a small spatial distance, and the high-temperature charged particles generated during disconnection are difficult to completely dissociate, causing the arc to eject from the circuit breaker, and failing to achieve the zero arcing requirement of the circuit breaker body. Due to the need to meet the non-polarity wiring requirements, the incoming and outgoing line terminals may be connected to high-potential power lines. The spatial distance between the high potential of the arc striker and the low potential of the external grounding device is short, and the creepage distance is small, which makes it easy for the terminal to short-circuit to the ground when disconnecting the short-circuit current. The arc dissociation area between the arc striker and the external grounding device is a key area for suppressing arcs. If the suppression effect is poor, when disconnecting the short-circuit current, a breakdown will occur between the power supply and the grounding device, causing an arcing short circuit, and a short-circuit accident will occur during use.

[0028] To address existing issues, this embodiment provides a structure for suppressing arcing. This structure is located in the arc extinguishing zone 2 in front of the gas outlet 3 of the arc extinguishing chamber 1 and includes multiple arc extinguishing units spaced at regular intervals along the gas outlet direction. The arc extinguishing unit closest to the gas outlet 3 has a porous structure, while the adjacent arc extinguishing units have a spatial barrier structure.

[0029] The space blocking structure includes an air baffle assembly 11 that blocks the air flow in the air outlet direction. The air baffle assembly includes an air baffle that causes a part of the air flow to generate a reverse flow.

[0030] The arc extinguishing chamber 1 of this embodiment is provided with two gas outlets 3, located at either end of the arc extinguishing grid within the arc extinguishing chamber 1. The arc flashover suppression structure of this embodiment is provided in the arc extinguishing zone 2 in front of the two gas outlets 3. In this embodiment, an external grounding device 5 for detection can be provided outside the gas outlet 3, and external equipment can also be connected.

[0031] Two arc striking pieces 6 are provided in the arc extinguishing chamber 1, and one end of the two arc striking pieces 6 extends to the arc extinguishing zone 2 on both sides. The arc striking piece 6 on one side is connected to the static contact 8.

[0032] The arc suppression structure also includes a limiting boss 9 provided in the arc extinguishing chamber 1, such as Figure 3 As shown in the dotted area, the limiting boss 9 is provided at the position where the end of the arc-striking piece 6 extends toward the air outlet 3. In this embodiment, the limiting boss 9 is provided on the housing 10 of the device. Since the bending characteristics of the arc-striking piece 6 are subject to certain deformation, the limiting bosses 9 added on both sides of the housing 10 can improve the positioning effect of the arc-striking pieces 6 on both sides, thereby facilitating the installation of the arc extinguishing chamber 1. In addition, the limiting bosses 9 can increase the creepage distance between the arc-striking piece 6 and the external grounding devices 5 on both sides, thereby reducing the high potential of the arc-striking piece 6 and the breakdown of the external grounding devices 5.

[0033] Example 1

[0034] like Figure 1 As shown, the arc extinguishing zone 2 of this embodiment includes two extinguishing units. The extinguishing unit near the gas outlet 3 has a porous structure, referred to as the porous extinguishing unit 4 in this embodiment. The extinguishing unit near the arc extinguishing chamber 1 has a spatial barrier structure. The arc-strike plates 6 and arc-extinguishing grids on both sides are retracted toward the interior of the circuit breaker, increasing the distance between the high-potential arc-strike plates 6 and the low-potential external grounding device 5, thereby improving arc cooling.

[0035] The porous deionization unit 4 utilizes deionization material. The spatial barrier structure utilizes an air baffle assembly 11 to slow the airflow velocity at the air outlet 3, increasing the contact area between the arc and the insulating material and reducing the arc energy. The porous deionization unit 4 following the air baffle assembly 11 further cools and deionizes the high-temperature free particles, achieving arc suppression.

[0036] like Figure 2As shown, the baffle assembly 11 in this embodiment includes a first baffle 12 and a second baffle 13 arranged in sequence along the gas outlet direction, and the first baffle 12 and the second baffle 13 are respectively provided with two and arranged in axial symmetry. The orientations of the first baffle 12 and the second baffle 13 are both inclined at a certain angle with the gas outlet direction, and the first baffle 12 and the second baffle 13 are close to the arc chamber 1 at one end and close to the central axis of the gas outlet 3. In this embodiment, the orientations of the first baffle 12 and the second baffle 13 are consistent, and the angle of inclination in this embodiment is an acute angle. The first baffle 12 divides the space into multiple passages, three passages in this embodiment, including the upper and lower side air flow paths and the middle main air flow path; the second baffle 13 retains the main air flow path, while blocking the two air flow paths divided by the first baffle 12 to generate counterflow and converge to the main air flow path.

[0037] By Figure 2 As shown by the arrows in the baffle assembly 11, after the high-temperature gas flow is discharged from the arc chamber 1, it first passes through the first baffle 12, and after being divided by the first baffle 12, part of it flows out from the main air flow path, and the other part flows out from the two side air flow paths; the gas flowing out from the side air flow paths forms counterflow after being blocked by the second baffle 13 and returns to the main air flow path. Since the reverse air flow and the main air flow path are opposite in direction, they can offset part of the main path air flow, reducing the arc energy of the gas flow at the gas outlet 3. Further, the gas flow discharged from the main air flow path passes through the porous arc extinction unit 4, allowing the charged particles to be more fully filtered, achieving arc suppression.

[0038] Embodiment Two

[0039] The basic structure of this embodiment is the same as that of Embodiment One, except that the arc extinction zone 2 in this embodiment includes three arc extinction units, and a porous arc extinction unit is provided on the front side of the arc extinction unit containing the baffle assembly 11 in Embodiment One. In this embodiment, the porous arc extinction unit 4 close to the arc chamber 1 is referred to as the internal porous arc extinction unit 4, and the porous arc extinction unit 4 close to the gas outlet 3 is referred to as the external porous arc extinction unit 4.

[0040] The internal porous arc extinction unit 4 can be a metal mesh or insulating material with relatively large gas outlet holes to filter out part of the charged particles; the external porous arc extinction unit 4 can be a metal device with smaller gas outlet holes to achieve more complete filtering.

[0041] After the high-temperature gas flow is discharged from the arc chamber 1, it is first filtered once by the internal porous arc extinction unit 4, then the high-temperature gas flow is slowed down and cooled by the baffle assembly 11 to reduce the arc energy, and then filtered again by the external porous arc extinction unit 4 to achieve better arc extinction effect and better achieve complete suppression of the arc inside the circuit breaker.

[0042] Embodiment three

[0043] As Figure 4 shown, the arc extinction zone 2 of the embodiment includes two porous extinction units, which are referred to as porous extinction units 4 in the embodiment.

[0044] The high-temperature arc first passes through the inner porous extinction unit 4 to perform the first cooling and extinction of the arc, then passes through the air between the inner and outer porous extinction units 4 to perform the cooling, and then passes through the outer porous extinction unit 4 to perform the second arc extinction, so that the arc is suppressed inside the arc discharge port of the circuit breaker, the arc discharge port 3 only discharges high-temperature gas, and the arc is effectively suppressed.

[0045] As Figure 4 shown in the middle line, the potential path on the right side of the arc extinguishing chamber 1: the potential passes through the potential path in sequence from the wire terminal 7, the arc striking piece 6, the arc extinction zone 2, the air outlet 3 and the external grounding device 5 on the same side. The potential path on the left side of the arc extinguishing chamber 1: the potential passes through the potential path in sequence from the wire terminal 7, the static contact 8, the arc striking piece 6, the arc extinction zone 2, the air outlet 3 and the external grounding device 5 on the same side.

[0046] In other embodiments, the porous extinction unit 4 can also be provided with more than two layers to further improve the extinction and filtering effect of the high-temperature charged particles of the arc.

[0047] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0048] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0049] In the present application, unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise expressly limited. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise expressly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0051] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0052] The above detailed the preferred embodiments of the present application. It should be understood that those skilled in the art can make many modifications and changes without creative labor according to the concept of the present application. Therefore, any technical solution obtained by logical analysis, reasoning or limited experiment on the basis of the prior art according to the concept of the present application shall be within the protection scope determined by the claims.

Claims

1. A structure for suppressing arcing, characterized in that: An arc extinguishing zone (2) arranged in front of an air outlet (3) of an arc extinguishing chamber (1) comprises a plurality of extinguishing units arranged at intervals along an air outlet direction; the extinguishing unit closest to the air outlet (3) is provided with a porous structure, and the adjacent extinguishing units are provided with a space barrier structure; the space barrier structure comprises an air baffle assembly (11) that blocks airflow in the air outlet direction, and the air baffle assembly (11) comprises an air baffle that causes a portion of the airflow to generate a reverse flow.

2. The structure for suppressing arcing according to claim 1, characterized in that: The air baffle assembly (11) comprises a first air baffle (12) and a second air baffle (13) arranged in sequence along the air outlet direction; the first air baffle (12) divides the space into a plurality of passages; the second air baffle (13) causes a portion of the airflow passing through the first air baffle (12) to generate a reverse flow and converge into one passage.

3. The structure for suppressing arcing according to claim 2, characterized in that: Two of the first air baffles (12) and the second air baffles (13) are respectively provided and are symmetrically arranged along the axial direction.

4. The structure for suppressing arcing according to claim 2 or 3, characterized in that: The first air baffle (12) and the second air baffle (13) are both inclined at a certain angle to the air outlet direction.

5. The structure for suppressing arcing according to claim 4, characterized in that: The first air baffle (12) and the second air baffle (13) are oriented in the same direction.

6. The structure for suppressing arcing according to claim 1, characterized in that: When the arc extinguishing zone (2) includes two extinguishing units provided with a porous structure, the gas outlet of the extinguishing unit close to the interior of the arc extinguishing chamber (1) is larger than the gas outlet of the extinguishing unit close to the gas outlet (3).

7. The structure for suppressing arcing according to claim 1, characterized in that: The arc deionization zone (2) comprises three deionization units, wherein the deionization unit located in the middle is provided with a space barrier structure, and the other two deionization units are provided with porous structures.

8. The structure for suppressing arcing according to claim 1, characterized in that: It also includes a limiting boss (9) arranged in the arc extinguishing chamber (1), wherein an arc striking piece (6) is provided in the arc extinguishing chamber (1), and the limiting boss (9) is located at the end of the arc striking piece (6) extending toward the gas outlet (3).

9. The structure for suppressing arcing according to claim 1, characterized in that: The arc extinguishing chamber (1) is provided with two air outlets (3), which are respectively located at the two ends of the arc extinguishing grid in the arc extinguishing chamber (1); the arc flashover suppression structure is respectively provided in the arc extinguishing zone (2) in front of the two air outlets (3).

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