Arc extinguishing mechanism and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing mechanism and a circuit breaker. The circuit breaker comprises an arc extinguishing mechanism, the arc extinguishing mechanism comprises a shell, an arc extinguishing piece and a shielding assembly, and the shell is provided with an opening; the arc extinguishing piece is arranged in the shell; the shielding assembly is assembled on the shell and shields the opening; and the shielding assembly comprises an arc isolating sheet and a baffle plate, the arc isolating sheet is connected with the baffle plate, and the arc isolating sheet is configured to be capable of overturning in a direction far away from the arc extinguishing piece relative to the baffle plate under the action of an electric arc. The arc extinguishing mechanism can ensure the assembly stability of the arc isolating sheet, solves the problem that the arc isolating sheet is blown away from the shell of the arc extinguishing mechanism, further ensures the sealing performance of the circuit breaker, facilitates the rising of air pressure in the shell of the circuit breaker, ensures the breaking and arc extinguishing stability of the circuit breaker, ensures the protection grade of the circuit breaker, and improves the reliability of the circuit breaker. The problem that foreign matter falls into the circuit breaker from the opening of the shell is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to an arc extinguishing mechanism and a circuit breaker. Background Art

[0002] The automatic arc blowing technology (also known as air blowing technology) of low-voltage circuit breakers mainly relies on the energy of the electric arc to increase the pressure in the arc extinguishing chamber. The pressure difference between this pressure and the atmosphere outside the arc extinguishing chamber can form an airflow discharged from the arc extinguishing chamber through the air outlet. This airflow can cool the arc and generate a driving force for the arc, forcing the arc to quickly enter the arc extinguishing grid and extinguish, so as to achieve the arc extinguishing effect.

[0003] In order to better achieve air blowing and ensure a good arc extinguishing effect, the circuit breaker provided by the related technology needs to set the arc extinguishing system as a closed space. At the same time, in order to ensure that the gas can be discharged smoothly, an opening needs to be set in the shell, and a shielding component is set at the opening; the shielding component includes an arc isolation sheet and a baffle, wherein the arc isolation sheet is usually made of Nomix paper or other similar flexible materials, and an exhaust port is set on the baffle. When the circuit breaker encounters a major fault and is disconnected, the flexible arc isolation sheet will be blown up by the airflow formed by the arc to ensure that the gas is discharged reliably.

[0004] Under normal circumstances, the arc-isolating plates can automatically reset after the gas in the arc-extinguishing chamber is discharged; however, the arc-isolating plates configured in the circuit breaker provided by the related technology are easily separated from the shell when blown up by the gas, which leads to a decrease in the sealing of the circuit breaker shell, which is not conducive to the increase in air pressure inside the circuit breaker shell, and has an adverse effect on the breaking and arc extinguishing of the circuit breaker. The protection level of the circuit breaker will also be reduced due to the decrease in sealing, and foreign matter is likely to fall into the circuit breaker from the exhaust port set on the baffle. Utility Model Content

[0005] The utility model aims to provide an arc extinguishing mechanism and a circuit breaker, which can ensure the assembly stability of the arc isolation plate, improve the problem of the arc isolation plate being blown away from the shell of the arc extinguishing mechanism, and further ensure the sealing of the circuit breaker, which is conducive to the increase of the air pressure inside the shell of the circuit breaker, ensure the stability of the circuit breaker's disconnection and arc extinguishing, and ensure the protection level of the circuit breaker, and improve the problem of foreign matter falling into the circuit breaker from the opening of the shell.

[0006] The embodiment of the utility model is achieved as follows:

[0007] In a first aspect, the utility model provides an arc extinguishing mechanism, comprising:

[0008] A shell body, wherein the shell body is provided with an opening;

[0009] An arc extinguishing member, the arc extinguishing member is arranged in the housing; and

[0010] A shielding assembly is assembled on the shell and shields the opening; the shielding assembly includes an arc-isolating plate and a baffle, the arc-isolating plate is connected to the baffle, and the arc-isolating plate is configured to be able to flip relative to the baffle in a direction away from the arc-extinguishing member under the action of the electric arc.

[0011] In an optional embodiment, the arc isolation piece includes a connecting portion and a flipping portion connected to each other, the connecting portion is connected to the baffle, and the flipping portion is configured to flip relative to the baffle in a direction away from the arc extinguishing member under the action of the electric arc.

[0012] In an optional embodiment, the connecting portion is provided with a notch, and the flip portion extends into the notch.

[0013] In an optional embodiment, the connecting portion includes a first side edge, a second side edge, and a third side edge connected in sequence at an angle, and the first side edge, the second side edge, and the third side edge together form a gap; the flipping portion is connected to the second side edge, and a gap is distributed between the flipping portion and at least one of the first side edge and the third side edge.

[0014] In an optional embodiment, one of the connecting portion and the baffle is provided with a protrusion, and the other of the connecting portion and the baffle is provided with an inserting hole, and the protrusion is inserted into the inserting hole.

[0015] In an optional embodiment, the connecting portion includes a connecting body and a flange, the flange is movably connected to the connecting body, and the flange can be folded relative to the connecting body; the flange is provided with a protrusion or a plug-in hole, and the flange is connected to the baffle through the protrusion and the plug-in hole that are plug-fitted together, the flange and the connecting body are respectively located on both sides of the baffle, and the connecting body is located on the side of the baffle away from the arc extinguishing member.

[0016] In an optional embodiment, the connecting body includes a fourth side, a fifth side and a sixth side connected in sequence at an angle, the connecting portion includes a plurality of flanges, and the fourth side, the fifth side and the sixth side are all connected with flanges.

[0017] In an optional embodiment, the connecting portion and the baffle are connected by fasteners.

[0018] In an optional embodiment, at least one of the arc isolation sheet and the baffle is plugged into the housing; and / or,

[0019] The baffle is provided with an exhaust port.

[0020] In a second aspect, the utility model provides a circuit breaker, comprising the arc extinguishing mechanism of any one of the aforementioned implementation modes.

[0021] The beneficial effects of the arc extinguishing mechanism of the embodiment of the utility model include: the arc extinguishing mechanism provided by the embodiment of the utility model includes a housing, an arc extinguishing member and a shielding assembly, the housing is provided with an opening, the arc extinguishing member is provided in the housing, the shielding assembly is assembled in the housing and shields at the opening; the shielding assembly includes an arc-isolating sheet and a baffle, the arc-isolating sheet is connected to the baffle, and the arc-isolating sheet is configured to be able to flip relative to the baffle in a direction away from the arc-extinguishing member under the action of the electric arc. Since the arc-isolating sheet is connected to the baffle, the stability of the arc-isolating sheet assembled to the housing can be improved. After the arc-isolating sheet is blown up by the airflow generated by the electric arc, the arc-isolating sheet is not easy to separate from the housing, and then it can be ensured that after the arc is extinguished, the arc-isolating sheet can be reset to the position of shielding the opening, ensuring the sealing, which is conducive to the rise of the air pressure in the housing during arc extinguishing, ensuring the stability of arc extinguishing, improving the protection level, and improving the problem of foreign matter falling into the opening of the housing.

[0022] The beneficial effects of the circuit breaker of the embodiment of the utility model include: the circuit breaker provided by the embodiment of the utility model includes the aforementioned arc extinguishing mechanism, which can ensure the assembly stability of the arc isolation plate, improve the problem of the arc isolation plate being blown away from the shell of the arc extinguishing mechanism, and thus ensure the sealing of the circuit breaker, which is conducive to the increase of the air pressure inside the shell of the circuit breaker, ensure the stability of the circuit breaker's disconnection and arc extinguishing, and ensure the protection level of the circuit breaker, and improve the problem of foreign matter falling into the circuit breaker from the opening of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 It is a partial structural cross-sectional view of the circuit breaker when the arc isolation sheet is not blown up in the embodiment of the utility model;

[0025] Figure 2 for Figure 1 The enlarged view of the middle II;

[0026] Figure 3 It is a partial structural cross-sectional view of the circuit breaker when the arc isolation piece is blown up in the embodiment of the utility model;

[0027] Figure 4 This is a schematic diagram of the structure of the arc isolation plate in the embodiment of the utility model;

[0028] Figure 5 The structure of the shielding component in the embodiment of the utility model is shown in FIG. Figure 1 ;

[0029] Figure 6 The structure of the shielding component in the embodiment of the utility model is shown in FIG. Figure 2 ;

[0030] Figure 7 This is a schematic diagram of the structure of the baffle in the embodiment of the utility model;

[0031] Figure 8 A cross-sectional view of a shielding assembly in an embodiment of the utility model;

[0032] Fig. 9 It is a structural schematic diagram of a shielding assembly in other embodiments of the utility model;

[0033] Fig.10 It is a schematic diagram of the partial structure of the circuit breaker in the embodiment of the utility model;

[0034] Fig.11 It is a schematic diagram of the structure of the shell in the embodiment of the utility model.

[0035] Icons: 010-circuit breaker; 100-arc extinguishing mechanism; 110-housing; 111-opening; 112-slot; 120-arc extinguishing member; 130-shielding assembly; 140-arc isolation plate; 150-connecting portion; 151-first side; 152-second side; 153-third side; 154-notch; 155-protrusion; 160-connecting body; 161-flange; 162-fourth side; 163-fifth side; 164-sixth side; 170-flipping portion; 180-baffle; 181-plug hole; 182-exhaust port; 190-fastener; 201-moving contact; 202-static contact. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the terms "inside", "outside", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "setting" 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 an indirect connection 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.

[0041] Please refer to Figure 1 This embodiment provides a circuit breaker 010, which can be used to disconnect current to ensure the safety of electricity use and improve the risk caused by circuit short circuit.

[0042] The circuit breaker 010 includes a trip assembly (not shown), a moving contact 201, a stationary contact 202 and an arc extinguishing mechanism 100; the arc extinguishing mechanism 100 includes a shell 110 and an arc extinguishing member 120, the shell 110 is provided with an opening 111, the trip assembly, the arc extinguishing member 120, the moving contact 201 and the stationary contact 202 are all assembled on the shell 110, and the moving contact 201 can move relative to the shell 110 to contact or separate from the stationary contact 202; when the moving contact 201 contacts the stationary contact 202, the circuit is turned on; when the moving contact 201 separates from the stationary contact 202, the circuit is cut off. Among them, when a short circuit occurs at the load end of the circuit breaker 010, the short-circuit current of the circuit breaker 010 increases rapidly, causing the trip assembly to drive the circuit breaker 010 to trip and open under the action of the increased electromagnetic field, that is, the moving contact 201 and the static contact 202 are quickly separated under the action of the electric repulsion force, and an arc is generated between the moving contact 201 and the static contact 202. The arc energy can be divided into several short arcs under the action of the arc extinguishing element 120, and can form an airflow to be discharged from the opening 111 of the shell 110, thereby achieving the arc extinguishing effect.

[0043] The structures of the moving contact 201, the stationary contact 202, the trip assembly and the arc extinguishing member 120 of the circuit breaker 010 are similar to those in the related art and will not be described in detail here.

[0044] To ensure air tightness and arc extinguishing reliability; please refer to Figure 1 , Figure 2 and Figure 3 The arc extinguishing mechanism 100 of this embodiment also includes a shielding assembly 130, which is assembled on the shell 110 and shields the opening 111 of the shell 110; the shielding assembly 130 includes an arc-isolating sheet 140 and a baffle 180, the arc-isolating sheet 140 is connected to the baffle 180, and the arc-isolating sheet 140 is configured to be able to flip relative to the baffle 180 in a direction away from the arc-extinguishing member 120 under the action of the electric arc, so that the gas in the arc-extinguishing chamber can be smoothly discharged from the opening 111 of the shell 110.

[0045] Since the arc isolation sheet 140 is connected to the baffle 180, the stability of the arc isolation sheet 140 assembled on the shell 110 can be improved. After the arc isolation sheet 140 is blown up by the airflow generated by the electric arc, the arc isolation sheet 140 is not easy to separate from the shell 110, thereby ensuring that after the arc is extinguished, the arc isolation sheet 140 can be reset to the position of blocking the opening 111, thereby ensuring the sealing of the circuit breaker 010, which is beneficial to the increase of the air pressure inside the shell 110 of the circuit breaker 010, ensuring the stability of the disconnection and arc extinguishing of the circuit breaker 010, and ensuring the protection level of the circuit breaker 010, and improving the problem of foreign matter falling into the circuit breaker 010 from the opening 111 of the shell 110.

[0046] It should be noted that the arc extinguishing chamber refers to a space in the housing 110 corresponding to the arc extinguishing member 120 , and the space is connected to the opening 111 of the housing 110 .

[0047] Optionally, the arc isolation plate 140 can be made of Nomix paper or other similar flexible materials to ensure that the arc isolation plate 140 can flip relative to the baffle 180 in a direction away from the arc extinguishing member 120 under the action of the electric arc, so as to ensure that the gas in the arc extinguishing chamber can be reliably discharged, thereby ensuring the reliability of arc extinguishing and cooling, and at the same time ensuring that after the arc is extinguished, the arc isolation plate 140 can reliably reset to a position close to the baffle 180 to reliably cover the opening 111.

[0048] Optionally, the baffle 180 may be made of a hard material such as a laminate.

[0049] Please refer to Figure 4 and Figure 5The arc-isolating piece 140 of this embodiment includes a connecting portion 150 and a flipping portion 170 connected to each other, the connecting portion 150 is connected to the baffle 180, and the flipping portion 170 is configured to flip relative to the baffle 180 in a direction away from the arc-extinguishing member 120 under the action of the arc. Such a configuration can ensure that the arc-isolating piece 140 is stably connected to the baffle 180 while ensuring that the arc-isolating piece 140 can flip under the action of the arc, so as to ensure that the gas in the arc-extinguishing chamber can be discharged smoothly, and ensure the arc-extinguishing and temperature-reducing effects.

[0050] Furthermore, when the arc isolation plate 140 is not subjected to external force, the arc isolation plate 140 can cover the baffle plate 180; the baffle plate 180 is provided with an exhaust port 182, so that the gas in the arc extinguishing chamber can be discharged from the exhaust port 182 and the opening 111 of the shell 110 in sequence, that is, the gas in the arc extinguishing chamber can be blown out from the exhaust port 182 to blow the arc isolation plate 140, so that the arc isolation plate 140 is flipped relative to the baffle plate 180, and the gas can be blown out from the opening 111 of the shell 110.

[0051] It should be understood that in other embodiments, the baffle 180 is not provided with the exhaust port 182, and the length of the baffle 180 is smaller than the length of the arc isolation plate 140. When the arc isolation plate 140 is not subjected to external force, the baffle 180 only covers the connecting portion 150 of the arc isolation plate 140, but cannot cover the flipping portion 170 of the arc isolation plate 140. That is, a gap is reserved at the end of the baffle 180 for gas to blow toward the flipping portion 170 of the arc isolation plate 140, so as to blow the arc isolation plate 140 to flip it and ensure that the gas is blown out from the opening 111 of the shell 110.

[0052] Optionally, see Figure 4 The connecting portion 150 of the arc isolation piece 140 is provided with a notch 154, and the turning portion 170 extends into the notch 154. In this way, the length of the turning portion 170 can be increased, so that when the arc isolation piece 140 turns over under the action of the arc, it has a larger turning amplitude, so as to expose more space corresponding to the opening 111, and ensure that the gas in the arc extinguishing chamber is discharged reliably and efficiently.

[0053] Furthermore, the connecting portion 150 includes a first side 151, a second side 152, and a third side 153 connected in sequence at an angle, the first side 151 and the third side 153 are distributed on the same side of the second side 152, the first side 151, the second side 152, and the third side 153 together form a notch 154, and the connecting portion 150 is roughly in a "concave" shape; the flip portion 170 is connected to the second side 152, and the flip portion 170 and the first side 151 and the third side 153 are both distributed with gaps. The connection between the flip portion 170 and the second side 152 can be used as the rotation axis of the flip portion 170 to ensure that the flip portion 170 has a larger flipping range, so that under the action of the arc, more space corresponding to the opening 111 is exposed, and the gas in the arc extinguishing chamber is ensured to be discharged reliably and efficiently.

[0054] Of course, in other embodiments, the flip portion 170 is spaced apart from only one of the first side edge 151 and the third side edge 153 .

[0055] Alternatively, in other embodiments, the connection portion 150 may not be provided with the notch 154 , and the flip portion 170 is connected to the end of the connection portion 150 .

[0056] The angle between the first side 151 and the second side 152, and the angle between the second side 152 and the third side 153 can be set as needed; in this embodiment, the angle between the first side 151 and the second side 152, and the angle between the second side 152 and the third side 153 are all 90°.

[0057] Of course, in other embodiments, the included angle between the first side 151 and the second side 152 , and the included angle between the second side 152 and the third side 153 may also be 80°, 100°, etc., which are not specifically limited here.

[0058] The connection method between the arc isolation plate 140 and the baffle 180 can be selected as needed; please refer to Figure 4 , Figure 5 , Figure 6 and Figure 7 In this embodiment, the connection portion 150 of the arc isolation sheet 140 is provided with a protrusion 155, and the baffle 180 is provided with an insertion hole 181, and the protrusion 155 is plugged into the insertion hole 181. Such a configuration ensures the stability of the connection between the arc isolation sheet 140 and the baffle 180 on the one hand, and ensures the ease of operation of connecting the arc isolation sheet 140 and the baffle 180 on the other hand.

[0059] Of course, in other embodiments, the connecting portion 150 is provided with a plug-in hole 181 , and the baffle 180 is provided with a protrusion 155 , and the protrusion 155 is plug-fitted with the plug-in hole 181 .

[0060] Optionally, the plug hole 181 may be a through hole or a blind hole, which is not specifically limited here.

[0061] In order to further improve the stability of the connection between the arc isolation sheet 140 and the baffle 180; please refer to Figure 4 , Figure 5 and Figure 6The connecting portion 150 includes a connecting body 160 and a flange 161, the connecting body 160 is provided with a notch 154, and the connecting body 160 is connected to the flip portion 170; the flange 161 is movably connected to the connecting body 160, and the flange 161 can be folded relative to the connecting body 160; the flange 161 is provided with a protrusion 155, and the flange 161 is connected to the baffle 180 through the protrusion 155 and the plug-in hole 181 that are plug-fitted, the flange 161 and the connecting body 160 are respectively located on both sides of the baffle 180, and the connecting body 160 is located on the side of the baffle 180 that is away from the arc extinguishing member 120, that is, when the flange 161 is connected to the baffle 180 through the protrusion 155 and the plug-in hole 181 that are plug-fitted, the connecting body 160 and the flange 161 jointly clamp the baffle 180; in this way, the stability of the connection between the arc isolation sheet 140 and the baffle 180 can be ensured.

[0062] When the protrusion 155 is plugged into the plug hole 181, only when the flange 161 is subjected to a force perpendicular to the axis of the protrusion 155 (such as Figure 8 When the force in the directions of F2 and F3 is applied to the arc extinguishing chamber 140, the flange 161 can separate the protrusion 155 from the plug hole 181 to cut off the connection between the arc-isolating plate 140 and the baffle 180. When a short circuit occurs at the load end of the circuit breaker 010, causing the moving contact 201 to separate from the static contact 202 and causing an arc to be drawn between the two, the gas in the arc-extinguishing chamber passes through the exhaust port 182 of the baffle 180 and blows onto the surface of the arc-isolating plate 140. The force (such as the force in the directions of F2 and F3 applied to the baffle 180) applied to the arc-isolating plate 140 by the gas. Figure 8 The direction of the force (in the direction F1) is parallel or approximately parallel to the axis of the protrusion 155. This force not only cannot separate the protrusion 155 from the plug-in hole 181, that is, not only cannot flip the flange 161 relative to the connecting body 160 so that the flange 161 and the connecting body 160 no longer clamp the baffle 180, but also can make the protrusion 155 more stably plugged into the plug-in hole 181, thereby ensuring the stability of the connection between the arc isolation plate 140 and the baffle 180, ensuring that the arc isolation plate 140 will not be separated from the shell 110 under the action of the gas blown out of the arc extinguishing chamber, ensuring that the arc isolation plate 140 can be reset to the position of blocking the opening 111, thereby ensuring the sealing of the circuit breaker 010, which is beneficial to the increase of the air pressure inside the shell 110 of the circuit breaker 010, ensuring the stability of the circuit breaker 010 in breaking and arc extinguishing, and ensuring the protection level of the circuit breaker 010, and improving the problem of foreign matter falling into the circuit breaker 010 from the opening 111 of the shell 110.

[0063] For further information, please refer to Figure 4The connecting body 160 includes a fourth side 162, a fifth side 163 and a sixth side 164 which are connected in sequence at an angle, and the connecting portion 150 includes a plurality of flanges 161, and the fourth side 162, the fifth side 163 and the sixth side 164 are all connected with flanges 161. In this way, the plurality of flanges 161 can be used to wrap around the three sides of the baffle 180, so as to further improve the assembly stability of the arc isolation sheet 140 through the connection between the plurality of flanges 161 and the baffle 180.

[0064] The number of flanges 161 connected to the fourth side 162, the fifth side 163 and the sixth side 164 can be selected as needed; in this embodiment, each of the fourth side 162, the fifth side 163 and the sixth side 164 is connected to a flange 161. Of course, in other embodiments, the number of flanges 161 connected to at least one of the fourth side 162, the fifth side 163 and the sixth side 164 can also be two, three, etc., which is not specifically limited here.

[0065] The number of protrusions 155 provided on the flange 161 can be selected as needed; in this embodiment, the number of protrusions 155 connected to the flange 161 connecting the fourth side 162 and the sixth side 164 is two, and the number of protrusions 155 connected to the flange 161 connecting the fifth side 163 is three; the number of plug-in holes 181 provided on the baffle 180 is adapted to the number of protrusions 155 provided on the arc isolation plate 140, so that the multiple protrusions 155 are plugged in and matched with the multiple plug-in holes 181 in a one-to-one correspondence.

[0066] Of course, in other embodiments, the number of protrusions 155 connected to any flange 161 can also be one, four, etc., which is not specifically limited here.

[0067] It should be understood that in other embodiments, the arc isolation sheet 140 and the baffle 180 may also be connected in other ways, for example: Fig. 9 The connecting portion 150 of the arc isolation plate 140 and the baffle 180 are connected by a fastener 190. Specifically, the connecting body 160 and the baffle 180 may be connected by the fastener 190, or the connecting body 160, the baffle 180 and the flange 161 may be connected together by the fastener 190. The fastener 190 includes but is not limited to rivets and bolts. Or, for example, the connecting portion 150 of the arc isolation plate 140 and the baffle 180 are bonded, etc. Specifically, the connecting body 160 and the baffle 180 may be bonded, or both the connecting body 160 and the flange 161 may be bonded to the baffle 180. No specific limitation is made here.

[0068] It should be noted that, in the embodiment where the connection portion 150 is only connected to the connection body 160 and the baffle 180 , the flange 161 may not be provided on the connection portion 150 of the arc isolation sheet 140 .

[0069] Optionally, the flange 161 does not block the exhaust port 182 provided on the baffle 180 ; of course, in other embodiments, part of the exhaust port 182 is blocked by the flange 161 , which is not specifically limited here.

[0070] The method of assembling the shielding assembly 130 to the housing 110 can be selected as needed; please refer to Fig.10 and Fig.11 In this embodiment, both the arc-isolating sheet 140 and the baffle 180 are plugged into the housing 110 at the same time. Specifically, the housing 110 is provided with a slot 112, and the arc-isolating sheet 140 and the baffle 180 are plugged into the slot 112 together; specifically, the connecting body 160, the baffle 180 and the flange 161 are all plugged into the slot 112. Such a configuration ensures easy operation and stability of assembly.

[0071] Of course, in other embodiments, only the baffle 180 may be plugged into the slot 112 , which is not specifically limited here.

[0072] Alternatively, in other embodiments, at least one of the baffle 180 and the arc isolation sheet 140 may also be bonded to the housing 110 and connected via fasteners such as bolts, which is not specifically limited herein.

[0073] Optionally, the shell 110 includes an upper shell and a lower shell that are interlocked and connected, and the trip assembly, the arc extinguishing member 120, the moving contact 201 and the static contact 202 are all arranged in the installation space between the upper shell and the lower shell; the upper shell and the lower shell are assembled to form an opening 111, and the slot 112 is arranged in the lower shell.

[0074] The connection methods of the upper shell and the lower shell include but are not limited to clamping and connecting with fasteners such as bolts.

[0075] When the circuit breaker 010 of this embodiment is in use, if a short circuit occurs at the load end, the moving contact 201 can be separated from the static contact 202 to cut off the circuit. The arc energy generated when the moving contact 201 and the static contact 202 are separated can be cut under the action of the arc extinguishing member 120, and the gas in the arc extinguishing chamber can blow up the arc isolation plate 140 to discharge it from the arc extinguishing chamber; after the gas is discharged, the arc isolation plate 140 can also be reset to cover the baffle 180.

[0076] To sum up, the arc extinguishing mechanism 100 configured for the circuit breaker 010 of the utility model can ensure the assembly stability of the arc isolation plate 140, improve the problem of the arc isolation plate 140 being blown away from the shell 110 of the arc extinguishing mechanism 100, and further ensure the sealing of the circuit breaker 010, which is beneficial to the increase of the air pressure inside the shell 110 of the circuit breaker 010, ensure the stability of the breaking and arc extinguishing of the circuit breaker 010, and ensure the protection level of the circuit breaker 010, and improve the problem of foreign matter falling into the circuit breaker 010 from the opening 111 of the shell 110.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An arc extinguishing mechanism, characterized in that: include: A housing (110), wherein the housing (110) is provided with an opening (111); An arc extinguishing member (120), the arc extinguishing member (120) being arranged in the housing (110); as well as, A shielding assembly (130), wherein the shielding assembly (130) is assembled on the housing (110), and the shielding assembly (130) shields the opening (111); the shielding assembly (130) comprises an arc-isolating sheet (140) and a baffle (180), the arc-isolating sheet (140) is connected to the baffle (180), and the arc-isolating sheet (140) is configured to be able to flip relative to the baffle (180) in a direction away from the arc-extinguishing member (120) under the action of an electric arc.

2. The arc extinguishing mechanism according to claim 1, characterized in that: The arc isolation piece (140) comprises a connecting portion (150) and a flipping portion (170) which are connected to each other, wherein the connecting portion (150) is connected to the baffle (180), and the flipping portion (170) is configured to flip relative to the baffle (180) in a direction away from the arc extinguishing member (120) under the action of an electric arc.

3. The arc extinguishing mechanism according to claim 2, characterized in that: The connecting portion (150) is provided with a notch (154), and the flip portion (170) extends into the notch (154).

4. The arc extinguishing mechanism according to claim 3, characterized in that: The connecting portion (150) comprises a first side edge (151), a second side edge (152) and a third side edge (153) which are connected in sequence at an angle, and the first side edge (151), the second side edge (152) and the third side edge (153) together form the notch (154); the flipping portion (170) is connected to the second side edge (152), and a gap is distributed between the flipping portion (170) and at least one of the first side edge (151) and the third side edge (153).

5. The arc extinguishing mechanism according to any one of claims 2 to 4, characterized in that: One of the connecting portion (150) and the baffle (180) is provided with a protrusion (155), and the other of the connecting portion (150) and the baffle (180) is provided with an inserting hole (181), and the protrusion (155) is inserted into the inserting hole (181).

6. The arc extinguishing mechanism according to claim 5, characterized in that: The connecting portion (150) comprises a connecting body (160) and a flange (161), wherein the flange (161) is movably connected to the connecting body (160) and can be folded relative to the connecting body (160); the flange (161) is provided with the protrusion (155) or the plug-in hole (181), and the flange (161) is connected to the baffle (180) through the protrusion (155) and the plug-in hole (181) that are plug-fitted, the flange (161) and the connecting body (160) are respectively located on two sides of the baffle (180), and the connecting body (160) is located on the side of the baffle (180) that is away from the arc extinguishing member (120).

7. The arc extinguishing mechanism according to claim 6, characterized in that: The connecting body (160) comprises a fourth side (162), a fifth side (163) and a sixth side (164) which are connected in sequence at an angle, and the connecting portion (150) comprises a plurality of flanges (161), and the fourth side (162), the fifth side (163) and the sixth side (164) are all connected to the flanges (161).

8. The arc extinguishing mechanism according to any one of claims 2 to 4, characterized in that: The connecting portion (150) and the baffle (180) are connected via a fastener (190).

9. The arc extinguishing mechanism according to claim 1, characterized in that: At least one of the arc isolation sheet (140) and the baffle (180) is plugged into the housing (110); and / or, The baffle (180) is provided with an exhaust port (182).

10. A circuit breaker, characterized in that: It comprises the arc extinguishing mechanism as described in any one of claims 1 to 9.

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