Blocking structure of arc extinguish chamber and circuit breaker

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a blocking structure of an arc extinguish chamber and a circuit breaker. The blocking structure of the arc extinguish chamber is used for the circuit breaker, the circuit breaker comprises a shell and the arc extinguish chamber located in the shell, the arc extinguish chamber comprises a left partition plate, a right partition plate, a movable run-on plate and a plurality of arc extinguish grid pieces, the blocking structure is arranged on the back of the arc extinguish chamber, and all the arc extinguish grid pieces are divided into first sections and second sections in the vertical direction. The first section is positioned above the second section; and the blocking structure is located at the second section and is used for blocking the rear end of the arc extinguishing grid sheet in the second section. The arrangement of the blocking structure can increase the pressure intensity in the arc extinguish chamber to compress the arc and enhance the air blowing effect on one hand, and can change the distribution of the airflow field in the arc extinguish chamber, guide the airflow to the movable run-on plate and improve the arc striking effect of the movable run-on plate on the other hand, so that the arc can enter the arc extinguish chamber more easily, and the service life of the arc extinguish chamber is prolonged. Therefore, the working voltage and the breaking performance of the circuit breaker product are improved.

Description

Technical Field

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

[0002] With the rapid development of economy and the rapid improvement of people's living standards, there is a higher demand for household electricity safety. Circuit breakers can be installed on terminal distribution lines. At the same time, they can also connect, carry and disconnect currents under normal or abnormal circuit conditions, forming effective protection for lines and electrical equipment.

[0003] At present, in order to improve the operating voltage and breaking performance of circuit breakers, increasing the number of arc extinguishing chamber grids is an effective method, but this will lead to an increase in the height of the arc extinguishing chamber. However, due to product structure limitations, the contact spacing cannot be increased at will. In order to allow the arc to be introduced into the arc extinguishing chamber, the arc-striking part at the front end of the moving arc-striking plate of the arc extinguishing chamber can only be lengthened, and the angle between the arc extinguishing chamber and the arc extinguishing chamber can be reduced.

[0004] However, doing so will increase the difficulty of transferring the moving arc root to the arc extinguishing chamber, which is not conducive to the arc entering the arc extinguishing chamber to achieve the purpose of rapid arc extinguishing, and may even fail to extinguish the arc normally, resulting in breaking failure. Utility Model Content

[0005] The utility model aims to provide a blocking structure of an arc extinguishing chamber and a circuit breaker, so as to solve the technical problem in the prior art that the arc-striking part at the front end of the moving arc-striking plate of the arc extinguishing chamber is lengthened, and the angle between the moving arc root and the arc extinguishing chamber is reduced, which makes it difficult for the moving arc root to transfer to the arc extinguishing chamber, is not conducive to the arc entering the arc extinguishing chamber, and achieves the purpose of rapid arc extinguishing, and may even fail to extinguish the arc normally, causing a breaking failure.

[0006] The utility model provides a blocking structure of an arc extinguishing chamber, which is used for a circuit breaker. The circuit breaker comprises a shell and the arc extinguishing chamber located in the shell. The arc extinguishing chamber comprises a left partition, a right partition, a movable arc-striking plate and a plurality of arc-extinguishing grids. The left partition and the right partition are arranged opposite to each other. All the arc-extinguishing grids are sequentially arranged between the left partition and the right partition in an up-down direction. The movable arc-striking plate is arranged above the uppermost arc-extinguishing grid, and an arc-striking portion is arranged at the front end of the movable arc-striking plate. The blocking structure is arranged at the back of the arc extinguishing chamber, and all the arc-extinguishing grids are divided into a first section and a second section in an up-down direction, and the first section is located above the second section.

[0007] The blocking structure is located at the second section and is used to block the rear end of the arc extinguishing grid in the second section;

[0008] The sealing structure is connected to the housing, or the sealing structure is connected to the arc extinguishing chamber.

[0009] As a further technical solution, the sealing structure is a sealing plate, and a side of the sealing plate facing the arc-extinguishing grid is detachably connected to the arc-extinguishing grid.

[0010] As a further technical solution, at least one slot is provided on one side of the sealing plate facing the arc extinguishing grid, and the slot extends along the left-right direction of the sealing plate, and the slot is used to insert the arc extinguishing grid;

[0011] And / or, at least one insert is provided on a side of the sealing plate facing the arc-extinguishing grid, and the insert extends along the left-right direction of the sealing plate, and the insert is used to be inserted between adjacent arc-extinguishing grids.

[0012] As a further technical solution, the sealing plate is recessed from a side facing the arc extinguishing grid to a side facing away from the arc extinguishing grid to form the slot, and a plurality of slots are provided along the upper and lower directions of the sealing plate;

[0013] The inserting pieces are formed between adjacent slots.

[0014] As a further technical solution, along the left-right direction of the sealing plate, the slot passes through the left and right ends of the sealing plate.

[0015] As a further technical solution, at least one exhaust hole is provided on the sealing plate, and the exhaust hole passes through a side of the sealing plate facing the arc-extinguishing grid and a side away from the arc-extinguishing grid.

[0016] As a further technical solution, a plurality of exhaust holes are provided, and all the exhaust holes are divided into a plurality of groups in the left-right direction of the sealing plate, each group has a plurality of exhaust holes along the up-down direction of the sealing plate, and all the exhaust holes are not at the same height.

[0017] As a further technical solution, the blocking structure is made of insulating material.

[0018] As a further technical solution, along the up and down direction, the length of the second section is greater than the length of the first section.

[0019] The utility model provides a circuit breaker, which comprises the blocking structure of the arc extinguishing chamber.

[0020] Compared with the prior art, the arc extinguishing chamber sealing structure and circuit breaker provided by the utility model have the following technical advantages:

[0021] The utility model provides a blocking structure of an arc extinguishing chamber, which is used for a circuit breaker. The circuit breaker comprises a shell and an arc extinguishing chamber located in the shell. The arc extinguishing chamber comprises a left partition, a right partition, a movable arc-striking plate and a plurality of arc-extinguishing grids. The left partition and the right partition are arranged opposite to each other. All arc-extinguishing grids are sequentially arranged between the left partition and the right partition at intervals along the up-down direction. The movable arc-striking plate is arranged above the uppermost arc-extinguishing grid, and an arc-striking portion is arranged at the front end of the movable arc-striking plate. The blocking structure is arranged at the back of the arc extinguishing chamber, and all arc-extinguishing grids are divided into a first section and a second section along the up-down direction, and the first section is located above the second section. The blocking structure is located at the second section and is used for blocking the rear end of the arc-extinguishing grid in the second section. The blocking structure is connected to the shell, or the blocking structure is connected to the arc extinguishing chamber.

[0022] The setting of the sealing structure can, on the one hand, increase the pressure inside the arc extinguishing chamber, compress the arc, and enhance the effect of air blowing. On the other hand, it can change the distribution of the airflow field inside the arc extinguishing chamber, guide the airflow to the moving arc-striking plate, improve the arc-striking effect of the moving arc-striking plate, and make the arc more conducive to entering the arc extinguishing chamber, thereby improving the operating voltage and breaking performance of the circuit breaker product. At the same time, the sealing structure is only located at the second section and blocks the rear end of the arc extinguishing grid in the second section. Since the rear end of the arc extinguishing grid in the first section is not blocked, the arc extinguishing grid in the first section can be exhausted to the back of the arc extinguishing chamber at the first section. In addition, the sealing structure can be connected to the housing of the circuit breaker or to the arc extinguishing chamber to increase adaptability.

[0023] The circuit breaker provided by the utility model includes the sealing structure of the arc extinguishing chamber mentioned above. Therefore, the technical advantages and effects achieved by the circuit breaker include the technical advantages and effects achieved by the sealing structure of the arc extinguishing chamber mentioned above, which will not be elaborated in detail here.

[0024] Other features and advantages of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of a sealing plate provided in an embodiment of the utility model installed on an arc extinguishing chamber;

[0027] Figure 2 An exploded view of the installation of the sealing baffle and the arc extinguishing chamber provided in the embodiment of the utility model;

[0028] Figure 3A schematic diagram of a sealing plate facing the arc extinguishing chamber provided in an embodiment of the utility model;

[0029] Figure 4 A schematic diagram of a sealing plate provided in an embodiment of the utility model, facing away from the arc extinguishing chamber.

[0030] Icons: 1-arc extinguishing chamber; 2-left partition; 3-right partition; 4-moving arc-striking plate; 5-arc extinguishing grid; 6-arc-striking part; 7-sealing plate; 8-slot; 9-insert; 10-exhaust hole; 11-rounded corner. DETAILED DESCRIPTION

[0031] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0035] The present invention will be further described in detail below through specific implementation examples in conjunction with the accompanying drawings.

[0036] Specific structure such as Figures 1 to 4 shown.

[0037] The present embodiment provides a blocking structure of an arc extinguishing chamber 1, which is used for a circuit breaker. The circuit breaker includes a housing and the arc extinguishing chamber 1 located in the housing. The arc extinguishing chamber 1 includes a left partition 2, a right partition 3, a movable arc-striking plate 4 and a plurality of arc-extinguishing grids 5. The left partition 2 and the right partition 3 are arranged opposite to each other. All the arc-extinguishing grids 5 are sequentially arranged between the left partition 2 and the right partition 3 in an up-down direction. The movable arc-striking plate 4 is arranged above the uppermost arc-extinguishing grid 5, and an arc-striking portion 6 is arranged at the front end of the movable arc-striking plate 4. The blocking structure is arranged at the back of the arc extinguishing chamber 1, and all the arc-extinguishing grids 5 are divided into a first section and a second section in an up-down direction, and the first section is located above the second section. The blocking structure is located at the second section and is used to block the rear end of the arc-extinguishing grid 5 in the second section. The blocking structure is connected to the housing, or the blocking structure is connected to the arc extinguishing chamber 1.

[0038] The setting of the sealing structure can, on the one hand, increase the internal pressure of the arc extinguishing chamber 1, compress the arc, and enhance the effect of air blowing. On the other hand, it can change the distribution of the airflow field inside the arc extinguishing chamber 1, guide the airflow to the moving arc-striking plate 4, improve the arc-striking effect of the moving arc-striking plate 4, and make the arc more conducive to entering the arc extinguishing chamber 1, thereby improving the operating voltage and breaking performance of the circuit breaker product. At the same time, the sealing structure is only located at the second section and blocks the rear end of the arc extinguishing grid 5 in the second section. Since the rear end of the arc extinguishing grid 5 in the first section is not blocked, the arc extinguishing grid 5 in the first section can be exhausted to the back of the arc extinguishing chamber 1 at the first section. In addition, the sealing structure can be connected to the housing of the circuit breaker, or to the arc extinguishing chamber 1, to increase adaptability.

[0039] In this embodiment, the sealing structure can be integrally formed with the housing of the circuit breaker, fixedly connected or detachably connected, and the sealing structure can also be integrally formed with the arc extinguishing chamber 1, fixedly connected or detachably connected. The fixed connection can be riveted or other fixed connections, and the detachable connection can be plug-in, inlay, clamp, glue or screw connection.

[0040] In the optional technical solution of this embodiment, the sealing structure is a sealing plate 7, and the side of the sealing plate 7 facing the arc extinguishing grid 5 is detachably connected to the arc extinguishing grid 5. The sealing plate 7 is a plate structure with a simple structure and convenient manufacturing. At the same time, the sealing plate 7 is detachably connected to the arc extinguishing grid 5, and is easy to install and disassemble.

[0041] The present embodiment is not limited thereto, and the sealing structure may also be a cover body, and the cover body has a cover cavity. The shape of the cover body is determined according to specific requirements, and the cover cavity corresponds to the arc-extinguishing grid 5 .

[0042] In the optional technical solution of this embodiment, at least one slot 8 is provided on the side of the sealing plate 7 facing the arc extinguishing grid 5, and the slot 8 extends along the left and right direction of the sealing plate 7, and the slot 8 is used to plug the arc extinguishing grid 5; and / or, at least one plug 9 is provided on the side of the sealing plate 7 facing the arc extinguishing grid 5, and the plug 9 extends along the left and right direction of the sealing plate 7, and the plug 9 is used to be plugged between adjacent arc extinguishing grids 5.

[0043] In this embodiment, a plug-in piece 9 may be separately provided on the surface of the sealing baffle plate 7 facing the arc-extinguishing grid 5, and the plug-in piece 9 is in a strip shape and extends in the left and right direction of the sealing baffle plate 7. During installation, the sealing baffle plate 7 can be fixed to the back of the arc-extinguishing chamber 1 by simply inserting the plug-in piece 9 between adjacent arc-extinguishing grids 5. The installation and disassembly is convenient and the structure is simple. The number of plug-ins 9 may be less than the number of gaps between all the arc-extinguishing grids 5 in the second section, that is, the plug-in piece 9 is correspondingly inserted in part of the gaps between all the arc-extinguishing grids 5. Preferably, the number of plug-ins 9 is the same as the number of gaps between all the arc-extinguishing grids 5 in the second section, that is, the plug-in piece 9 is inserted in a one-to-one correspondence with the gaps between all the arc-extinguishing grids 5, so as to improve the stability of the installation. Alternatively, a groove body may be separately provided on the surface of the sealing baffle plate 7 facing the arc-extinguishing grid 5, and the groove body forms a slot 8, and the slot 8 is in a strip shape and extends in the left and right direction of the sealing baffle plate 7. During installation, it is only necessary to insert the arc-extinguishing grid 5 into the slot 8 to fix the sealing plate 7 on the back of the arc-extinguishing chamber 1. The installation and disassembly is convenient and the structure is simple. The number of slots 8 can be less than the number of all arc-extinguishing grids 5 in the second section, that is, some arc-extinguishing grids 5 are correspondingly inserted in the slots 8. Preferably, the number of slots 8 is the same as the number of all arc-extinguishing grids 5 in the second section, that is, all arc-extinguishing grids 5 in the second section are plugged into the slots 8 one by one, thereby improving the stability of the installation. It is also possible that a plug 9 is separately provided on the surface of the sealing plate 7 facing the arc-extinguishing grid 5, and the plug 9 is in the shape of a strip and extends in the left and right direction of the sealing plate 7. It is also possible that a groove body is separately provided on the surface of the sealing plate 7 facing the arc-extinguishing grid 5, and the groove body forms a slot 8, and the slot 8 is in the shape of a strip and extends in the left and right direction of the sealing plate 7. At this time, the number of plugs 9 and slots 8 is determined according to specific needs.

[0044] In this embodiment, the sealing plate 7 is preferably recessed toward the side away from the arc-extinguishing grid 5 from the side facing the arc-extinguishing grid 5 to form the slot 8, and a plurality of slots 8 are arranged at intervals along the up-down direction of the sealing plate 7; the intervals between adjacent slots 8 form the inserting piece 9. By providing the slots 8 on the sealing plate 7 and forming the inserting piece 9 at the same time, the manufacturing is convenient, and the inserting piece 9 and the slots 8 are assembled together with the arc-extinguishing grid 5, and the installation is stable.

[0045] In the optional technical solution of this embodiment, along the left and right directions of the sealing plate 7, the slot 8 penetrates the left and right ends of the sealing plate 7. That is, the slot 8 is a through slot that penetrates the left and right ends, which is easy to manufacture and easy to install and disassemble.

[0046] It should be noted that the slot 8 is connected so that the left and right width is small. However, the slot 8 may also not be connected to the left and right ends of the sealing baffle plate 7 along the left and right directions of the sealing baffle plate 7. If the slot 8 is not connected, the left and right width is large, but the airtight effect is better.

[0047] In an optional technical solution of this embodiment, at least one exhaust hole 10 is provided on the sealing plate 7, and the exhaust hole 10 passes through the side of the sealing plate 7 facing the arc extinguishing grid 5 and the side away from the arc extinguishing grid 5. The arc extinguishing grid 5 in the second section can be exhausted through the exhaust hole 10, thereby improving the exhaust effect.

[0048] Preferably, in this embodiment, a plurality of exhaust holes 10 are provided and staggered, so as to further improve the exhaust effect and prevent adjacent arc-extinguishing grids 5 from being short-circuited by electric arcs.

[0049] Furthermore, all the exhaust holes 10 are divided into multiple groups in the left-right direction of the sealing plate 7, and each group has multiple exhaust holes 10 along the upper-lower direction of the sealing plate 7, and all the exhaust holes 10 are not at the same height, and the regular arrangement improves the exhaust effect.

[0050] In the optional technical solution of this embodiment, the left and right ends of the sealing plate 7 are rounded corners 11, which avoids collision with other parts of the circuit breaker and causes damage, and occupies less space.

[0051] In the optional technical solution of this embodiment, the sealing structure is made of insulating material to improve the arc extinguishing effect and safety of the arc extinguishing chamber 1.

[0052] In the optional technical solution of this embodiment, along the vertical direction, the length of the second section is greater than the length of the first section, that is, the back of the arc extinguishing chamber 1 is mostly blocked by the blocking structure from bottom to top, thereby improving the arc extinguishing effect.

[0053] A circuit breaker provided in this embodiment includes the sealing structure of the arc extinguishing chamber 1 mentioned above. Therefore, the technical advantages and effects achieved by the circuit breaker include the technical advantages and effects achieved by the sealing structure of the arc extinguishing chamber 1 mentioned above, which will not be repeated here.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A blocking structure of an arc extinguishing chamber, used for a circuit breaker, the circuit breaker comprising a housing and the arc extinguishing chamber (1) located in the housing, the arc extinguishing chamber (1) comprising a left partition (2), a right partition (3), a movable arc-striking plate (4) and a plurality of arc-extinguishing grids (5), the left partition (2) and the right partition (3) being arranged opposite to each other, all the arc-extinguishing grids (5) being arranged in sequence and spaced apart between the left partition (2) and the right partition (3) in the up-down direction, the movable arc-striking plate (4) being arranged above the uppermost arc-extinguishing grid (5), and an arc-striking portion (6) being arranged at the front end of the movable arc-striking plate (4), characterized in that: The blocking structure is arranged at the back of the arc extinguishing chamber (1), and along the up and down direction, all the arc extinguishing grids (5) are divided into a first section and a second section, and the first section is located above the second section; The blocking structure is located at the second section and is used to block the rear end of the arc extinguishing grid (5) in the second section; The sealing structure is connected to the housing, or the sealing structure is connected to the arc extinguishing chamber (1).

2. The arc extinguishing chamber sealing structure according to claim 1, characterized in that: The sealing structure is a sealing plate (7), and a side of the sealing plate (7) facing the arc-extinguishing grid (5) is detachably connected to the arc-extinguishing grid (5).

3. The arc extinguishing chamber sealing structure according to claim 2, characterized in that: At least one slot (8) is provided on a side of the sealing plate (7) facing the arc-extinguishing grid (5), and the slot (8) extends in the left-right direction of the sealing plate (7), and the slot (8) is used for plugging the arc-extinguishing grid (5); And / or, at least one insert (9) is provided on a side of the sealing plate (7) facing the arc-extinguishing grid (5), and the insert (9) extends in the left-right direction of the sealing plate (7), and the insert (9) is used to be inserted between adjacent arc-extinguishing grids (5).

4. The arc extinguishing chamber sealing structure according to claim 3, characterized in that: The sealing plate (7) is recessed from a side facing the arc extinguishing grid (5) to a side facing away from the arc extinguishing grid (5) to form the slot (8), and a plurality of slots (8) are provided along the upper and lower directions of the sealing plate (7); The inserting piece (9) is formed between adjacent slots (8).

5. The arc extinguishing chamber sealing structure according to claim 4, characterized in that: Along the left-right direction of the sealing plate (7), the slot (8) passes through the left and right ends of the sealing plate (7).

6. The arc extinguishing chamber sealing structure according to claim 2, characterized in that: At least one exhaust hole (10) is provided on the sealing plate (7), and the exhaust hole (10) passes through a side of the sealing plate (7) facing the arc extinguishing grid (5) and a side away from the arc extinguishing grid (5).

7. The arc extinguishing chamber sealing structure according to claim 6, characterized in that: A plurality of exhaust holes (10) are provided, and all the exhaust holes (10) are divided into a plurality of groups in the left-right direction of the sealing plate (7), and each group has a plurality of exhaust holes (10) in the up-down direction of the sealing plate (7), and all the exhaust holes (10) are not at the same height.

8. The arc extinguishing chamber sealing structure according to any one of claims 1 to 7, characterized in that: The sealing structure is made of insulating material.

9. The arc extinguishing chamber sealing structure according to any one of claims 1 to 7, characterized in that: In the up-down direction, the length of the second section is greater than the length of the first section.

10. A circuit breaker, characterized in that: A sealing structure for an arc extinguishing chamber comprising any one of claims 1-9.

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