Arc extinguish chamber structure and circuit breaker

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses an arc extinguish chamber structure and a circuit breaker. The arc extinguish chamber structure comprises a shell, an arc extinguish grid plate group, a flame extinguish assembly, an arc extinguish cover and at least one blocking piece, wherein the shell is provided with a first mounting cavity and a second mounting cavity which are communicated with each other; the arc extinguishing grid sheet group is arranged in the first mounting cavity; the flame extinguishing assembly is arranged in the second mounting cavity; the arc extinguishing cover is fixed at one end, close to the second mounting cavity, of the shell, covers the second mounting cavity and is provided with an exhaust hole; the at least one blocking piece is arranged between the flame extinguishing assembly and the arc extinguishing cover, the two ends of the blocking piece are in lap joint with the shell, and the arc extinguishing cover is used for abutting each blocking piece against the shell. According to the technical scheme, the stopping pieces are arranged, each stopping piece abuts against the shell through the arc extinguishing cover, the flame extinguishing assembly is stopped by the stopping pieces when impacting upwards, and the problem that part of the arc extinguishing cover at the exhaust hole is damaged due to the fact that the flame extinguishing assembly directly makes contact with the arc extinguishing cover under the impact of airflow can be solved.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and in particular to an arc-extinguishing chamber structure and a circuit breaker. Background Technology

[0002] Circuit breakers are used to distribute electrical energy and protect lines and power equipment from faults such as overload, undervoltage, short circuit, and single-phase grounding. The arc-extinguishing chamber, on the other hand, eliminates electric arcs during the closing and opening processes. As the breaking capacity of circuit breakers increases, the requirements for the arc-extinguishing capacity of the arc-extinguishing chamber also increase, consequently requiring higher structural strength from the chamber.

[0003] During high-voltage rated ultimate short-circuit breaking capacity tests, existing circuit breakers experience upward movement of the flame extinguishing assembly within the arc-extinguishing chamber, impacting the arc-extinguishing cover due to the airflow generated during arc extinguishing. Existing arc-extinguishing chambers address this by installing pressure components outside the arc-extinguishing cover to prevent it from being ejected and causing the flame extinguishing assembly to fly out. However, these existing chambers do not solve the problem of the flame extinguishing assembly directly contacting the arc-extinguishing cover under airflow impact, thus damaging it. Because the arc-extinguishing cover at the exhaust port has low structural strength, the flame extinguishing assembly primarily damages the portion of the arc-extinguishing cover at the exhaust port. Utility Model Content

[0004] The purpose of this invention is to provide an arc-extinguishing chamber structure and circuit breaker that can solve the problem of the flame extinguishing assembly contacting the arc-extinguishing cover under the impact of airflow, thereby damaging part of the arc-extinguishing cover at the exhaust port.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] On the one hand, an arc-extinguishing chamber structure is provided, comprising:

[0007] The housing has a first mounting cavity and a second mounting cavity that are connected to each other.

[0008] An arc-extinguishing grid assembly is disposed within the first mounting cavity;

[0009] A flame extinguishing assembly is disposed within the second mounting cavity;

[0010] An arc-extinguishing cover is fixed to one end of the housing near the second mounting cavity. The arc-extinguishing cover covers the second mounting cavity and has an exhaust hole.

[0011] At least one abutment is disposed between the flame extinguishing assembly and the arc extinguishing cover, and both ends of the abutment overlap the housing. The arc extinguishing cover is used to press each abutment against the housing.

[0012] In some possible implementations, the housing has at least one set of grooves on the end face near the second mounting cavity. The set of grooves corresponds one-to-one with the abutment. The set of grooves includes two placement slots, and the two ends of each abutment overlap the corresponding two placement slots.

[0013] In some possible implementations, in each of the placement slots and the corresponding stopper, one is provided with a positioning protrusion and the other is provided with a positioning hole, the positioning protrusion being inserted into the positioning hole.

[0014] In some possible implementations, the sidewall of the stop member is in contact with the wall of the corresponding placement groove.

[0015] In some possible implementations, the depth of each placement slot is less than or equal to the thickness of the abutment.

[0016] In some possible implementations, each of the placement slots is a through slot.

[0017] In some possible implementations, the blocking member is a long strip structure.

[0018] In some possible implementations, at least two vent holes are provided, and the at least two vent holes are spaced apart along the length direction of the arc-extinguishing shroud. Each vent hole extends along the width direction of the arc-extinguishing shroud, and the elongated structure is intersected with all the vent holes.

[0019] In some possible implementations, the arc-extinguishing chamber structure further includes screws that pass through the arc-extinguishing cover and are threadedly connected to the housing.

[0020] On the other hand, a circuit breaker is provided, including a mounting base and an arc-extinguishing chamber structure as described in any of the above embodiments, wherein the arc-extinguishing chamber structure is fixed to the mounting base.

[0021] The beneficial effects of this utility model are:

[0022] The arc-extinguishing chamber structure provided by this utility model includes a shell, an arc-extinguishing grid assembly, a flame-extinguishing component, an arc-extinguishing cover, and at least one blocking member. By setting the arc-extinguishing grid assembly and the flame-extinguishing component, the electric arc is extinguished. The airflow generated during the arc extinguishing process is discharged from the exhaust port of the arc-extinguishing cover, thereby achieving arc extinguishing. By setting at least one blocking member, and by using the arc-extinguishing cover to press each blocking member firmly against the shell, the flame-extinguishing component is blocked when it impacts upwards, preventing damage to the portion of the arc-extinguishing cover at the exhaust port. This solves the problem of the flame-extinguishing component contacting the arc-extinguishing cover under the impact of airflow and thus damaging the portion of the arc-extinguishing cover at the exhaust port. Furthermore, by pressing each blocking member firmly against the shell using the arc-extinguishing cover, the blocking member can be fixed, eliminating the need for a separate fixing structure.

[0023] This utility model also provides a circuit breaker, including a fixed base and an arc-extinguishing chamber structure. The arc-extinguishing chamber structure is fixed to the fixed base. This circuit breaker can solve the problem that the flame extinguishing assembly contacts the arc-extinguishing cover under the impact of airflow, thereby damaging part of the arc-extinguishing cover at the exhaust port. Attached Figure Description

[0024] Figure 1 This is an exploded view of the arc-extinguishing chamber structure provided by this utility model;

[0025] Figure 2 This is a schematic diagram of the arc-extinguishing chamber structure (arc-extinguishing cover not shown) provided by this utility model;

[0026] Figure 3 This is a top view of the arc-extinguishing chamber structure provided by this utility model;

[0027] Figure 4 yes Figure 3 Sectional view at point AA;

[0028] Figure 5 This is a schematic diagram of the structure of the arc-blocking seat involved in this utility model;

[0029] Figure 6 This is a schematic diagram of the structure of the blocking component involved in this utility model.

[0030] In the picture:

[0031] 1. Housing; 11. First mounting cavity; 12. Second mounting cavity; 13. Placement groove; 131. Positioning protrusion; 14. Arc-blocking seat; 15. Side plate;

[0032] 2. Arc-extinguishing grid assembly; 21. Grid;

[0033] 3. Flame extinguishing assembly; 31. Flame extinguishing disc; 32. Arc baffle;

[0034] 4. Arc extinguishing cover; 41. Exhaust port; 5. Stopping component; 51. Positioning hole; 6. Screw. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0036] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0039] like Figures 1 to 6As shown, this utility model provides an arc-extinguishing chamber structure, including a housing 1, an arc-extinguishing grid assembly 2, a flame-extinguishing component 3, an arc-extinguishing cover 4, and at least one abutment 5. The housing 1 has a first mounting cavity 11 and a second mounting cavity 12 that are connected. The arc-extinguishing grid assembly 2 is disposed in the first mounting cavity 11. The flame-extinguishing component 3 is disposed in the second mounting cavity 12. The arc-extinguishing cover 4 is fixed to one end of the housing 1 near the second mounting cavity 12 and covers the second mounting cavity 12. The arc-extinguishing cover 4 has an exhaust hole 41. At least one abutment 5 is disposed between the flame-extinguishing component 3 and the arc-extinguishing cover 4, and both ends of the abutment 5 overlap the housing 1. The arc-extinguishing cover 4 is used to press each abutment 5 against the housing 1. By setting the arc-extinguishing grid assembly 2 and the flame-extinguishing component 3, the electric arc is extinguished. The airflow generated during the arc extinguishing process is discharged from the exhaust hole 41 of the arc-extinguishing cover 4, thereby achieving arc extinguishing. By providing at least one abutment 5 and securing each abutment 5 against the housing 1 via the arc-extinguishing cover 4, the flame extinguishing assembly 3 is blocked by the abutment 5 when it impacts upwards, preventing damage to the portion of the arc-extinguishing cover 4 at the exhaust port 41. This solves the problem of the flame extinguishing assembly 3 directly contacting the arc-extinguishing cover 4 under the impact of airflow, thus damaging the portion of the arc-extinguishing cover 4 at the exhaust port 41. Furthermore, securing each abutment 5 against the housing 1 via the arc-extinguishing cover 4 achieves fixation of the abutment 5, eliminating the need for a separate fixing structure.

[0040] Optionally, in this embodiment, the housing 1 includes an arc-isolating seat 14 and two side plates 15. The arc-isolating seat 14 is a frame structure, and the two side plates 15 are respectively disposed on both sides of the arc-isolating seat 14. The lower ends of the two side plates 15 and the arc-isolating seat 14 enclose a first mounting cavity 11, and the upper ends of the two side plates 15 and the arc-isolating seat 14 enclose a second mounting cavity 12. This configuration is simple in structure and convenient for processing and manufacturing. Further, to facilitate the assembly and disassembly of the flame extinguishing assembly 3, the flame extinguishing assembly 3 overlaps the arc-isolating seat 14. In addition, the arc-extinguishing grid plate assembly 2 in this embodiment includes multiple grid plates 21, which are parallel and spaced apart and fixed in the first mounting cavity 11. After the electric arc enters the first mounting cavity 11, it is divided into multiple short arc segments by the multiple grid plates 21. Optionally, the flame extinguishing assembly 3 includes at least two flame-extinguishing plates 31 and at least one arc-isolating plate 32, with an arc-isolating plate 32 provided between two adjacent flame-extinguishing plates 31. By setting an arc-blocking plate 32 to separate two adjacent flame-extinguishing plates 31, the arc-blocking plate 32 creates a gap between the two flame-extinguishing plates 31. This gap allows the electric arc to fully contact the flame-extinguishing plate 31, accelerating the cooling of the electric arc. In order to save space and cost while ensuring the arc-extinguishing effect, in this embodiment, there are three flame-extinguishing plates 31 and two arc-blocking plates 32, with one arc-blocking plate 32 between two adjacent flame-extinguishing plates 31.

[0041] Optionally, in this embodiment, the housing 1 has at least one set of grooves on the end face near the second mounting cavity 12. Each set of grooves corresponds to one of the abutment members 5. Each set of grooves includes two placement slots 13. Furthermore, the arc-extinguishing seat 14 is recessed with at least one set of grooves, and both ends of each abutment member 5 overlap with the corresponding two placement slots 13. By providing the placement slots 13, the overall structure of the arc-extinguishing chamber is made more compact, saving space. In addition, the arc-extinguishing plate 32 is 2 mm thick, ensuring the arc-extinguishing effect while allowing space for the abutment members 5 to overlap within the placement slots 13.

[0042] To ensure the accuracy of the position of the stopper 5 within the placement groove 13, optionally, in each placement groove 13 and the corresponding stopper 5, one is provided with a positioning protrusion 131, and the other is provided with a positioning hole 51, with the positioning protrusion 131 inserted into the positioning hole 51. In this embodiment, to facilitate the installation and processing of the stopper 5, each placement groove 13 has a positioning protrusion 131 extending vertically along its bottom wall, and the stopper 5 is correspondingly provided with a positioning hole 51, with the positioning protrusion 131 inserted into the positioning hole 51. Further, as... Figure 4 As shown, the positioning hole 51 is a through hole, and the length of the positioning protrusion 131 extending vertically is less than the depth of the through hole. That is, after the abutment 5 is installed on the positioning protrusion 131 through the positioning hole 51, the top surface of the positioning protrusion 131 is lower than the top surface of the abutment 5. With this setting, the arc extinguishing cover 4 can press the abutment 5 against the housing 1, avoid interference from the positioning protrusion 131, and make the fixing effect better.

[0043] Optionally, the side wall of the abutment 5 is fitted against the wall of the corresponding placement groove 13. This arrangement provides better positioning of the abutment 5. It is understandable that... Figure 2 and Figure 6 As shown, the sidewalls of the abutment 5 can be either the two sidewalls along its width or a single end face along its length. In this embodiment, both sidewalls of the abutment 5 along its width are fitted against the wall of the corresponding placement groove 13. Figure 6 The width direction is the width direction of the blocking part 5 itself, and the length direction is the length direction of the blocking part 5 itself.

[0044] Optionally, in this embodiment, as Figure 2 and Figure 6As shown, the depth of each placement groove 13 is less than or equal to the thickness of the abutment 5. When the depth of each placement groove 13 is less than the thickness of the abutment 5, after the abutment 5 is installed, a portion of the abutment 5 extends out of the placement groove 13. With this configuration, the arc-extinguishing cover 4 can press the abutment 5 tightly against the housing 1, avoiding interference with the housing 1 and improving the fixing effect. When the depth of each placement groove 13 is equal to the thickness of the abutment 5, after the abutment 5 is installed, the top surface of the abutment 5 is flush with the top surface of the arc-extinguishing seat 14, which also allows the arc-extinguishing cover 4 to press the abutment 5 tightly against the housing 1. In this embodiment, the width of each placement groove 13 is 6 mm. Figure 6 The thickness direction in the middle refers to the thickness direction of the abutment 5, and the thickness of the abutment 5 refers to the dimension of the abutment 5 along the thickness direction.

[0045] To facilitate the processing of the placement slots 13 and save processing steps, optionally in this embodiment, each placement slot 13 is a through slot, that is, one end of the placement slot 13 communicates with the second mounting cavity 12, and the other end of the placement slot 13 extends to the outer wall surface of the housing 1. In other embodiments, one end of the placement slot 13 communicates with the second mounting cavity 12, and the other end of the placement slot 13 does not extend to the outer wall surface of the housing 1, so that the abutment 5 can be attached to the placement slot 13.

[0046] Optionally, in this embodiment, as Figure 6 As shown, the blocking component 5 is a long strip structure. It is understandable that... Figure 6 The length direction in the diagram refers to the length direction of the stopper 5, and the two ends of the stopper 5 refer to the two ends along its own length direction. This design simplifies the structure and improves processing efficiency. Furthermore, the stopper 5 is made of iron, making it relatively sturdy and impact-resistant.

[0047] Optionally, such as Figure 3 As shown, at least two vent holes 41 are provided, spaced apart along the length of the arc-extinguishing cover 4. Each vent hole 41 extends along the width of the arc-extinguishing cover 4, and the elongated structure intersects with all the vent holes 41. This arrangement achieves venting while simultaneously improving impact resistance because the elongated structure's blocking range covers all the vent holes 41. Figure 3 The length direction in the middle is the length direction of the arc-extinguishing shield 4. Figure 3 The width direction is the same as the width direction of the arc-extinguishing cover 4. In this embodiment, the elongated structure is perpendicular to all the exhaust holes 41. In this embodiment, in order to further improve the ability to withstand impact, two elongated structures are provided, which are spaced apart on the housing 1, and further, the two elongated structures are spaced apart on the arc-extinguishing seat 14.

[0048] Optionally, such as Figure 1As shown, the arc-extinguishing chamber structure also includes screws 6. Specifically, screws 6 are installed on the side wall of the arc-extinguishing cover 4, and the screws 6 pass through the arc-extinguishing cover 4 and are threadedly connected to the housing 1. This arrangement enables a reliable connection between the arc-extinguishing cover 4 and the housing 1, and facilitates disassembly and assembly. In this embodiment, both side plates 15 are detachably connected to the arc-isolation seat 14, and the screws 6 pass through the arc-extinguishing cover 4 and the side plates 15 in sequence and are threadedly connected to the arc-isolation seat 14. The above arrangement makes disassembly and assembly more convenient.

[0049] When installing the arc-extinguishing chamber structure in this embodiment, one flame extinguishing plate 31, one arc-blocking plate 32, another flame extinguishing plate 31, another arc-blocking plate 32, and another flame extinguishing plate 31 are placed sequentially on the arc-blocking seat 14. Then, two abutment members 5 are overlapped in the placement groove 13 and positioned by the positioning hole 51 and the positioning protrusion 131. Afterward, screws 6 are passed through the arc-extinguishing cover 4 and the side plate 15 in sequence and threadedly connected to the arc-blocking seat 14. At this time, the arc-extinguishing cover 4 presses each abutment member 5 against the placement groove 13. When the airflow generated by arc extinguishing rises and drives the flame extinguishing plate 31 and the arc-blocking plate 32 to impact upward, the abutment member 5 can resist the flame extinguishing plate 31.

[0050] This utility model also provides a circuit breaker, including a fixed base and an arc-extinguishing chamber structure. The arc-extinguishing chamber structure is fixed to the fixed base. This circuit breaker can solve the problem that the flame extinguishing assembly 3 contacts the arc-extinguishing cover 4 under the impact of airflow, thereby damaging part of the arc-extinguishing cover 4 at the exhaust port 41.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An arc-extinguishing chamber structure, characterized in that, include: The housing (1) has a first mounting cavity (11) and a second mounting cavity (12) that are connected to each other; Arc-extinguishing grid assembly (2) is disposed in the first mounting cavity (11); The flame extinguishing assembly (3) is disposed in the second mounting cavity (12); An arc-extinguishing cover (4) is fixed to one end of the housing (1) near the second mounting cavity (12). The arc-extinguishing cover (4) covers the second mounting cavity (12). An exhaust hole (41) is provided on the arc-extinguishing cover (4). At least one stopper (5) is disposed between the flame extinguishing assembly (3) and the arc extinguishing cover (4), and both ends of the stopper (5) overlap the housing (1). The arc extinguishing cover (4) is used to press each of the stoppers (5) against the housing (1).

2. The arc-extinguishing chamber structure according to claim 1, characterized in that, The housing (1) has at least one groove group on one end face near the second mounting cavity (12). The groove group is provided in a one-to-one correspondence with the abutment (5). The groove group includes two placement grooves (13), and the two ends of each abutment (5) are respectively connected to the two corresponding placement grooves (13).

3. The arc-extinguishing chamber structure according to claim 2, characterized in that, In each of the placement slots (13) and the corresponding stopper (5), one is provided with a positioning protrusion (131) and the other is provided with a positioning hole (51), and the positioning protrusion (131) is inserted into the positioning hole (51).

4. The arc-extinguishing chamber structure according to claim 3, characterized in that, The side wall of the blocking member (5) is in contact with the groove wall of the corresponding placement groove (13).

5. The arc-extinguishing chamber structure according to claim 2, characterized in that, The depth of each of the placement slots (13) is less than or equal to the thickness of the stop (5).

6. The arc-extinguishing chamber structure according to claim 2, characterized in that, Each of the placement slots (13) is a through slot.

7. The arc-extinguishing chamber structure according to any one of claims 1-6, characterized in that, The blocking component (5) has a long strip structure.

8. The arc-extinguishing chamber structure according to claim 7, characterized in that, At least two exhaust holes (41) are provided, and at least two exhaust holes (41) are spaced apart on the arc-extinguishing cover (4) along the length direction of the arc-extinguishing cover (4). Each exhaust hole (41) extends along the width direction of the arc-extinguishing cover (4), and the elongated structure is intersected with all the exhaust holes (41).

9. The arc-extinguishing chamber structure according to any one of claims 1-6, characterized in that, The arc-extinguishing chamber structure also includes a screw (6), which passes through the arc-extinguishing cover (4) and is threadedly connected to the housing (1).

10. A circuit breaker, characterized in that, It includes a fixed base and an arc-extinguishing chamber structure as described in any one of claims 1-9, wherein the arc-extinguishing chamber structure is fixed to the fixed base.

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