A flying arc shield and circuit breaker

Abstract

The utility model relates to low voltage electric appliance technical field especially relates to a kind of anti arc cover and circuit breaker.The anti arc cover is used to cover the exhaust end of arc-extinguishing chamber of circuit breaker;The anti arc cover includes multiple wallboards, and multiple wallboards are enclosed to form the inner chamber of the anti arc cover, and the wallboard of the anti arc cover is arranged opposite the exhaust port of arc-extinguishing chamber is insulation wallboard, and the remaining wallboard of anti arc cover is metal wallboard, and first gas outlet is provided on insulation wallboard.Insulation wallboard is used to ensure the insulation performance of the anti arc cover, and eliminate the failure risk caused by high-temperature melting of metal surface insulating paint;Metal wallboard is used to improve the structural strength of the anti arc cover, to avoid the anti arc cover damage under gas impact.Due to the anti arc cover is provided with insulation wallboard and metal wallboard simultaneously, so that the anti arc cover has the advantages of high structural strength, not easy to damage, good insulation performance and good interphase isolation effect.

Description

Technical Field

[0001] This utility model relates to the field of low-voltage electrical technology, and in particular to an anti-arc flash cover and a circuit breaker. Background Technology

[0002] During the breaking process, circuit breakers generate high-temperature and high-pressure gas containing a large number of metal particles. In order to prevent the metal particles from damaging the electrical equipment around the circuit breaker, an anti-arc fly-off cover is usually installed on the outside of the exhaust end of the arc-extinguishing chamber of the circuit breaker to block the discharge of metal particles.

[0003] The current arc flash protection covers are divided into two types according to the material: (1) Arc flash protection covers made of metal; the advantage of this type of arc flash protection cover is that it has high structural strength and is not easily damaged; its disadvantage is that the insulating paint on the inner and outer surfaces of the arc flash protection cover is easily melted and ineffective by the high temperature gas generated when the product is broken, thereby causing a phase-to-phase short circuit. (2) Arc flash protection covers made of insulating material; the advantage of this type of arc flash protection cover is that it has good insulation and good phase-to-phase isolation effect; its disadvantage is that it has low structural strength and is easily broken by the high pressure gas generated when the product is broken.

[0004] Therefore, designing an anti-arc shield that combines the advantages of the two types of anti-arc shields while eliminating their disadvantages has become a technical problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] The first objective of this invention is to provide an anti-arc flyback cover, which has advantages such as high structural strength, resistance to damage, good insulation performance, and good phase-to-phase isolation.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An anti-arc flash cover is used to cover the exhaust end of the arc-extinguishing chamber of a circuit breaker; the anti-arc flash cover includes multiple wall panels, which together form the inner cavity of the anti-arc flash cover. The wall panel of the anti-arc flash cover that is opposite to the exhaust port of the arc-extinguishing chamber is an insulating wall panel, and the remaining wall panels of the anti-arc flash cover are metal wall panels. A first air outlet is provided on the insulating wall panel.

[0008] Furthermore, multiple metal wall panels are connected end to end to form a shell with openings at both ends, and the insulating wall panel covers one opening of the shell.

[0009] Furthermore, the anti-arc flash cover also includes a metal ring plate fixedly connected between the insulating wall panel and the metal wall panel;

[0010] The metal ring plate covers the periphery of the inner end face or the periphery of the outer end face of the insulating wall plate, and / or, the inner hole of the metal ring plate is fitted onto the insulating wall plate.

[0011] Furthermore, the metal ring plate covers the periphery of the outer end face of the insulating wall plate, and the outer end face of the insulating wall plate is provided with a protrusion in the middle for inserting into the inner hole of the metal ring plate, and the outer end face of the protrusion and the outer end face of the metal ring plate are coplanar;

[0012] And / or, the metal wall panel and the metal ring plate are integrally formed by a bending process;

[0013] And / or, the metal ring plate is provided with a plurality of first mounting holes, and the insulating wall plate is provided with a plurality of second mounting holes, wherein the first mounting holes and the second mounting holes are connected in a one-to-one correspondence;

[0014] And / or, the metal ring plate is engaged with the insulating wall plate;

[0015] And / or, the metal ring plate is provided with reinforcing ribs.

[0016] Furthermore, at least one of the metal panels is provided with a second air outlet.

[0017] Furthermore, the second air outlet is not provided on the metal wall panel on the same side as the operating end of the circuit breaker;

[0018] And / or, the metal wall panels located on both sides of the operating end of the circuit breaker are provided with the second air outlet;

[0019] And / or, a second air outlet is provided on the metal wall panel opposite to the operating end of the circuit breaker.

[0020] Furthermore, the number of arc-extinguishing chambers is multiple, and the multiple arc-extinguishing chambers are arranged side by side; the anti-arc cover also includes an insulating partition, which extends from the insulating wall panel to the arc-extinguishing chamber and is placed between two adjacent arc-extinguishing chambers.

[0021] Furthermore, the insulating wall panel and the insulating barrier are integrally formed;

[0022] And / or, the insulating barrier divides the inner cavity of the anti-arc shield into several independent compartments, each compartment corresponding to the exhaust end of the arc-extinguishing chamber.

[0023] Furthermore, at least one of the metal panels is provided with a third mounting hole for connecting the circuit breaker body to the circuit breaker.

[0024] The second objective of this invention is to provide a circuit breaker comprising an arc-extinguishing chamber and an anti-arc flyback cover as described in any of the preceding claims.

[0025] The beneficial effects of this utility model are:

[0026] This invention provides an anti-arc flash cover and a circuit breaker. The anti-arc flash cover is used to cover the exhaust end of the arc-extinguishing chamber of the circuit breaker. The anti-arc flash cover includes multiple wall panels that together form the inner cavity of the anti-arc flash cover. The wall panel opposite to the exhaust port of the arc-extinguishing chamber is an insulating wall panel, and the remaining wall panels are metal wall panels. A first vent is provided on the insulating wall panel. Most of the high-pressure, high-temperature gas generated when the circuit breaker trips is discharged from the exhaust port of the arc-extinguishing chamber and the first vent on the insulating wall panel. The metal wall panel does not come into direct contact with the high-pressure, high-temperature gas, thus reducing the risk of the insulating varnish on the surface of the metal wall panel melting and failing due to high temperature. Simultaneously, the metal wall panel improves the structural strength of the anti-arc flash cover, thereby preventing cracks or even explosions under the impact of high-pressure gas. The arc flash protection provided in this application has advantages such as high structural strength, not easy to be damaged, good insulation performance and good phase-to-phase isolation effect. It combines the advantages of arc flash protection made of all-metal material and arc flash protection made of all-insulated material, while eliminating the disadvantages of the two existing arc flash protections mentioned above. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 A three-dimensional structural schematic diagram of an anti-arc flyback cover provided in one embodiment of the present utility model;

[0029] Figure 2 for Figure 1 A three-dimensional structural diagram of the embodiment shown from another angle;

[0030] Figure 3 for Figure 1 A three-dimensional structural schematic diagram of the embodiment shown from another angle;

[0031] Figure 4 for Figure 1 Top view of the embodiment shown;

[0032] Figure 5 for Figure 1 A three-dimensional structural schematic diagram of the metal wall panel and metal ring plate in the illustrated embodiment;

[0033] Figure 6 for Figure 1 A three-dimensional structural schematic diagram of the insulating wall panel and insulating partition in the illustrated embodiment;

[0034] Figure 7 for Figure 6 A three-dimensional structural diagram from another angle;

[0035] Figure 8 for Figure 4 Sectional view at AA;

[0036] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0037] Figure 10 A three-dimensional structural schematic diagram of a metal wall panel, a metal ring plate, and reinforcing ribs provided for one embodiment of the present utility model;

[0038] Figure 11 A three-dimensional structural schematic diagram of an anti-arc flash cover provided for another embodiment of this utility model;

[0039] Figure 12 for Figure 11 Enlarged view of point D in the middle;

[0040] Figure 13 A side view of a circuit breaker provided in an embodiment of this utility model;

[0041] Figure 14 for Figure 13 Sectional view at BB;

[0042] Figure 15 A three-dimensional structural schematic diagram of the circuit breaker provided in an embodiment of this utility model.

[0043] icon:

[0044] 1-Insulating wall panel; 11-First air outlet; 12-Stepped surface; 13-Second mounting hole; 14-Positioning block;

[0045] 2-Metal wall panel; 21-Second air outlet; 22-Third mounting hole;

[0046] 3-Metal ring plate; 31-First mounting hole; 32-Positioning hole;

[0047] 4-Insulating barrier;

[0048] 5-Separation compartments;

[0049] 6-Reinforcing ribs;

[0050] 100 - Arc-extinguishing chamber; 110 - Raised bar;

[0051] 200 - Circuit breaker body; 210 - Base plate; 220 - Base; 230 - Pressure block. Detailed Implementation

[0052] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0053] It should be noted that in the description of this utility model, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] It should be noted that in the description of this utility model, the terms "connection" and "installation" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or a connection through an intermediate medium; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0055] A first aspect of this utility model provides an anti-arc flash cover, which is used to cover the exhaust end of the arc-extinguishing chamber 100 of a circuit breaker; see reference Figures 1 to 3 The anti-arc flight shield includes multiple wall panels, which together form the inner cavity of the anti-arc flight shield; combined with Figure 14 The wall panel of the anti-arc flash cover, which is opposite to the exhaust port of the arc extinguishing chamber 100, is an insulating wall panel 1, and the remaining wall panels of the anti-arc flash cover are metal wall panels 2. The insulating wall panel 1 is provided with a first air outlet 11.

[0056] The arc-extinguishing shield provided in this application consists of an insulating wall panel 1 and a metal wall panel 2. As the names suggest, the insulating wall panel 1 is made of insulating material, and the metal wall panel 2 is made of metal. The insulating wall panel 1 is positioned opposite the exhaust port of the arc-extinguishing chamber 100. When the circuit breaker breaks, most of the high-pressure and high-temperature gas generated is discharged sequentially from the exhaust port of the arc-extinguishing chamber 100 and the first exhaust port 11 on the insulating wall panel 1. Since the insulating wall panel 1 is made entirely of insulating material, the risk of failure caused by the melting of the insulating varnish on the metal surface due to high temperature is eliminated, ensuring the overall insulation performance of the arc-extinguishing shield. The metal wall panel 2 does not come into direct contact with the high-pressure and high-temperature gas, thus reducing the risk of the insulating varnish on the surface of the metal wall panel 2 melting and failing due to high temperature. At the same time, the metal wall panel 2 improves the structural strength of the arc-extinguishing shield, thereby avoiding the problem of cracks or even explosion of the arc-extinguishing shield under the impact of high-pressure gas. The arc flash protection provided in this application has advantages such as high structural strength, not easy to be damaged, good insulation performance and good phase-to-phase isolation effect. It combines the advantages of arc flash protection made of all-metal material and arc flash protection made of all-insulated material, while eliminating the disadvantages of the two existing arc flash protections mentioned above.

[0057] Furthermore, at least one metal panel 2 is provided with a third mounting hole 22 for connecting the circuit breaker body 200. In this embodiment, the metal panel 2 on the same side as the operating end of the circuit breaker and the metal panel 2 away from the operating end of the circuit breaker are respectively provided with third mounting holes 22. When installing the anti-arc flash cover, screws or other fasteners are passed through the third mounting holes 22 and screwed onto the circuit breaker body 200 to fix the anti-arc flash cover onto the circuit breaker body 200.

[0058] In some embodiments, at least one metal wall panel 2 is provided with a second vent 21. The second vent 21, as part of the arc-extinguishing shield, increases the pressure relief path; when the circuit breaker trips, the generated gas is simultaneously exhausted through the first vent 11 and the second vent 21, improving the exhaust efficiency and pressure relief capacity of the arc-extinguishing shield. Furthermore, since the insulating wall panel 1 is opposite the exhaust port of the arc-extinguishing chamber 100, i.e., the first vent 11 faces the exhaust port of the arc-extinguishing chamber 100, most of the gas carrying charged particles generated when the circuit breaker trips is discharged through the first vent 11. Therefore, compared to the second vent 21, the first vent 11 has a smaller aperture and a denser arrangement, which better blocks the metal particles carried in the gas, thereby better eliminating metal particles in the exhaust gas and preventing damage to electrical equipment around the circuit breaker. The second vent 21 has a larger aperture, which accelerates the airflow inside and outside the arc-extinguishing shield, improving its pressure relief and cooling capacity.

[0059] In some embodiments, the metal wall panel 2 on the same side as the operating end of the circuit breaker is not provided with a second vent 21 to prevent hot air ejected from the arc-extinguishing cover from injuring the operator. Except for the metal wall panel 2 on the same side as the operating end of the circuit breaker, the other metal wall panels 2 may selectively have second vents 21 provided according to the pressure relief and installation requirements of the circuit breaker. For example, when the pressure relief requirement of the circuit breaker is low or electrical components are installed on the back side of the circuit breaker (i.e., the side away from the operating end), the metal wall panels 2 on both sides of the operating end of the circuit breaker are provided with second vents 21, while the metal wall panel 2 away from the operating end of the circuit breaker is not provided with a second vent 21; when the pressure relief requirement of the circuit breaker is high or no electrical components are installed on the back side of the circuit breaker, except for the metal wall panel 2 on the same side as the operating end of the circuit breaker, the other metal wall panels 2 are provided with second vents 21, allowing air to escape from the top, left, right, and rear of the arc-extinguishing cover. Of course, if the installation environment of the circuit breaker ensures that the hot air ejected on the same side as the operating end of the circuit breaker will not cause safety problems, a second air outlet 21 can also be provided on the metal wall panel 2 on the same side as the operating end of the circuit breaker.

[0060] The anti-arc flyback shield provided in this embodiment achieves multi-directional exhaust through the first air outlet 11 and the second air outlet 21, thereby improving the pressure relief capacity of the anti-arc flyback shield. At the same time, compared with the second air outlet 21, the first air outlet 11 has a smaller aperture and a denser arrangement of orifices, thus achieving both air pressure release and effectively eliminating free metal particles in the exhaust gas.

[0061] In some embodiments, a plurality of metal wall panels 2 are connected end to end to form a shell with openings at both ends. An insulating wall panel 1 covers one opening of the shell, and the shell fits onto the arc-extinguishing chamber 100 through its other opening. Specifically, refer to Figure 11 There are four metal wall panels 2, which are connected end to end to form a rectangular shell with openings at both the top and bottom. An exhaust port is provided at the top of the arc-extinguishing chamber 100. Multiple metal wall panels 2 are arranged around the arc-extinguishing chamber 100, and an insulating wall panel 1 covers the top opening formed by the multiple metal wall panels 2.

[0062] It should be noted that the connection form of the multiple metal wall panels 2 is adjusted according to the orientation of the exhaust port of the arc-extinguishing chamber 100. When an exhaust port is provided on one side of the arc-extinguishing chamber 100 in the horizontal direction, the multiple metal wall panels 2 are connected to form a shell. The bottom and one side of the shell have openings respectively. The shell is fitted onto the arc-extinguishing chamber 100 through its bottom opening. The horizontal opening of the shell is opposite to the exhaust port of the arc-extinguishing chamber 100 and is covered by an insulating wall panel 1.

[0063] In some embodiments, continue to refer to Figures 1 to 3The anti-arc flash cover provided in this application also includes a metal ring plate 3 fixedly connected between the insulating wall plate 1 and the metal wall plate 2; the metal ring plate 3 covers the periphery of the inner end face or the periphery of the outer end face of the insulating wall plate 1, and / or, the inner hole of the metal ring plate 3 is fitted onto the insulating wall plate 1. The inner end face of the insulating wall plate 1 is the end face located inside the anti-arc flash cover, and the outer end face of the insulating wall plate 1 is the end face located outside the anti-arc flash cover. The function of the metal ring plate 3 is: firstly, the metal ring plate 3 connects the insulating wall plate 1 and the metal wall plate 2; secondly, when the metal ring plate 3 covers the periphery of the inner and outer end faces of the insulating wall plate 1, it can share some of the gas impact force borne by the insulating wall plate 1, thereby improving the structural strength of the insulating wall plate 1 and preventing the insulating wall plate 1 from falling off or breaking under the impact of gas. Preferably, as Figures 1 to 3 As shown, the metal ring plate 3 covers the periphery of the outer end face of the insulating wall plate 1. This arrangement allows the metal ring plate 3 to be secured to the outside of the insulating wall plate 1, thereby preventing the insulating wall plate 1 from falling off the metal wall plate 2 under the impact of gas from the inside out.

[0064] Based on the above structure, as an optional embodiment:

[0065] The metal ring plate 3 covers the periphery of the outer end face of the insulating wall plate 1. The outer end face of the insulating wall plate 1 is provided with a protrusion in the middle for inserting into the inner hole of the metal ring plate 3. The outer end face of the protrusion and the outer end face of the metal ring plate 3 are coplanar.

[0066] And / or, the metal wall panel 2 and the metal ring plate 3 are integrally formed by bending process;

[0067] And / or, the metal ring plate 3 is provided with a plurality of first mounting holes 31, and the insulating wall plate 1 is provided with a plurality of second mounting holes 13, the first mounting holes 31 and the second mounting holes 13 are connected in a one-to-one correspondence;

[0068] And / or, the metal ring plate 3 is snapped into the insulating wall plate 1;

[0069] And / or, the metal ring plate 3 is provided with reinforcing ribs 6.

[0070] In some embodiments, refer to Figure 4 , Figure 8 and Figure 9The outer end face of the insulating wall plate 1 has a protrusion at its center, and a stepped surface 12 is formed around the protrusion. A metal ring plate 3 is fitted onto the protrusion and covers the stepped surface 12. The inner circumferential surface of the metal ring plate 3 and the circumferential surface of the protrusion can be a clearance fit, a transition fit, or an interference fit, preferably a clearance fit. The outer end face of the metal ring plate 3 is coplanar with the outer end face of the protrusion. In the above structure, the stepped surface 12, the outer end face of the protrusion, and their connecting surfaces together constitute the outer end face of the insulating wall plate 1. The metal ring plate 3 is embedded in the outer end face of the metal ring plate 3, which enhances the stability of the connection between the two and makes them less prone to relative wobbling. Of course, the outer end face of the metal ring plate 3 and the outer end face of the protrusion can also be non-coplanar, for example, the outer end face of the metal ring plate 3 is 1 mm higher than the outer end face of the protrusion, or the outer end face of the metal ring plate 3 is 1 mm lower than the outer end face of the protrusion.

[0071] In some other embodiments, the outer end face of the insulating wall plate 1 may not have a protrusion. In this case, the outer end face of the insulating wall plate 1 is a complete plane, and the outer end face of the insulating wall plate 1 abuts against and is coplanar with the inner end face of the metal ring plate 3.

[0072] In an embodiment where the metal ring plate 3 covers the periphery of the inner end face of the insulating wall plate 1, the inner end face of the insulating wall plate 1 may have a protrusion in the middle and a stepped surface formed around the protrusion, or the inner end face of the insulating wall plate 1 may be a complete plane.

[0073] In some embodiments, refer to Figure 5 and Figure 6 The metal ring plate 3 has several first mounting holes 31, and the insulating wall plate 1 has several second mounting holes 13. The first mounting holes 31 and second mounting holes 13 are connected in a one-to-one correspondence. A set of corresponding first mounting holes 31 and second mounting holes 13 can be connected by fasteners such as screws and pins to achieve the installation and fixation of the insulating wall plate 1 and the metal ring plate 3. Furthermore, the stepped surface 12 has multiple first mounting holes 31 arranged in a ring, and the metal ring plate 3 has multiple second mounting holes 13 arranged in a ring. The insulating wall plate 1 is fixed to the metal ring plate 3 through the multiple first mounting holes 31 and second mounting holes 13.

[0074] In some embodiments, refer to Figure 5 The metal wall panel 2 and the metal ring plate 3 are integrally formed through a bending process to simplify the processing and assembly of the anti-arc flash cover. In processing the metal wall panel 2 and the metal ring plate 3, a metal sheet of a predetermined shape is first cut using a laser cutting process, and various through holes (including air vents, mounting holes, and the inner hole of the metal ring plate 3) are cut into the metal sheet. Then, the metal sheet is bent to form the individual metal wall panels 2 and metal ring plates 3. Finally, the joints of the bent metal sheets are welded, thus completing the processing and fixing of the metal wall panel 2 and the metal ring plate 3.

[0075] In some other embodiments, the individual metal wall panels 2 and metal ring plates 3 can also be cut separately and fixed together by welding.

[0076] In some embodiments, refer to Figure 10 The metal ring plate 3 is provided with reinforcing ribs 6. The metal ring plate 3 and the reinforcing ribs 6 can be integrally formed during cutting and blanking to further simplify the processing and assembly process of the anti-arc flash cover. The number of reinforcing ribs 6 can be adjusted according to the actual situation. In this embodiment, there are three arc-extinguishing chambers 100, and one reinforcing rib 6 is provided between every two adjacent arc-extinguishing chambers 100. Furthermore, the outer end face of the insulating wall plate 1 is provided with a groove for embedding the reinforcing ribs 6, so that the outer end face of the insulating wall plate 1, the outer end face of the metal ring plate 3, and the outer end face of the reinforcing ribs 6 are coplanar. The reinforcing ribs 6 can also share part of the gas impact force borne by the insulating wall plate 1, thereby further improving the structural strength of the insulating wall plate 1.

[0077] In some embodiments, refer to Figure 11 and Figure 12 The metal ring plate 3 is provided with positioning holes 32, and the insulating wall plate 1 is provided with positioning blocks 14, which are engaged in the positioning holes 32. Specifically, the insulating wall plate 1 is provided with a stepped surface 12 (as described above), and multiple positioning blocks 14 are arranged in a ring on the stepped surface 12. The metal ring plate 3 is provided with multiple positioning holes 32 arranged in a ring. The positioning blocks 14 are corresponding to each other and are engaged in the positioning holes 32 through elastic deformation. The insulating wall plate 1 is engaged on the metal ring plate 3 through the positioning blocks 14 and the positioning holes 32. The positioning holes and positioning blocks and the first and second mounting holes can be provided in only one of these two installation methods, or they can be provided simultaneously.

[0078] In some embodiments, refer to Figure 7 and Figure 14 The arc-extinguishing chambers 100 are multiple, arranged side-by-side. The anti-arc flash cover also includes insulating spacers 4, which extend from the insulating wall panel 1 towards the arc-extinguishing chambers 100 and are placed between two adjacent arc-extinguishing chambers 100. The number of insulating spacers 4 is adjusted according to the number of arc-extinguishing chambers 100, with one insulating spacer 4 placed between every two adjacent arc-extinguishing chambers 100. The insulating spacers 4 are used to separate adjacent arc-extinguishing chambers 100, preventing insulation breakdown between adjacent arc-extinguishing chambers 100 and ensuring phase-to-phase insulation.

[0079] In some embodiments, the insulating partition 4 divides the inner cavity of the arc-extinguishing cover into several independent compartments 5, each compartment 5 corresponding to the exhaust end of the arc-extinguishing chamber 100. Specifically, refer to... Figure 14The upper end of the insulating partition 4 is connected to the insulating wall panel 1, and its lower end is placed between two adjacent arc-extinguishing chambers 100. Its two ends in the horizontal direction respectively abut against the front and rear metal wall panels 2 or have a small gap (the width of the gap ranges from 0.5mm to 2mm). The insulating wall panel 1, the metal wall panel 2 and the insulating partition 4 together form the partition chamber 5.

[0080] In some embodiments, continue to refer to Figure 14 The distance between the exhaust port end face of the arc-extinguishing chamber 100 and the inner end face of the insulating wall plate 1 ranges from 2mm to 5mm. This arrangement reduces the overall height of the circuit breaker, meeting the needs of applications with limited installation space. Compared to conventional all-metal arc-extinguishing shields, the wall plate opposite the exhaust port of the arc-extinguishing chamber 100 provided in this application is an insulating wall plate 1. The insulating wall plate 1 does not pose a risk of insulation failure; therefore, reducing the distance between the exhaust port end face of the arc-extinguishing chamber 100 and the inner end face of the insulating wall plate 1 will not cause phase-to-phase short circuits. Compared to conventional fully insulating arc-extinguishing shields, the four side walls of the arc-extinguishing shield provided in this application are metal wall plates 2, which have higher structural strength. Therefore, reducing the distance between the exhaust port end face of the arc-extinguishing chamber 100 and the inner end face of the insulating wall plate 1 will not cause damage to the arc-extinguishing shield under gas impact. Of course, for applications where the installation space of the circuit breaker is not restricted, the distance between the end face of the exhaust port of the arc-extinguishing chamber 100 and the inner end face of the insulating wall plate 1 is also not restricted. In this case, the distance can be greater than 5mm.

[0081] In some embodiments, such as Figure 7 As shown, the insulating wall panel 1 and the insulating barrier 4 are integrally formed to simplify the processing and assembly of the anti-arc flash cover.

[0082] Of course, in some other embodiments, the insulating wall panel 1 and the insulating partition 4 can also be separate structures, and the two are fixedly connected by fasteners such as snap-fit ​​or screws. For example, a plurality of first slots are provided on the inner end face of the insulating wall panel 1, and a plurality of second slots are provided on the circuit breaker body 200. The first slots, the insulating partition 4 and the second slots correspond one-to-one. One end of the insulating partition 4 is inserted into the corresponding first slot, and the other end of the insulating partition 4 is inserted into the corresponding second slot, thus realizing the fixed installation of the insulating partition 4.

[0083] In summary, among the multiple wall panels of the anti-arc flash cover provided in this embodiment, the wall panel opposite to the exhaust port of the arc-extinguishing chamber 100 is an insulating wall panel 1, and the remaining wall panels are metal wall panels 2. The insulating wall panel 1 ensures the insulation performance of the anti-arc flash cover, preventing the risk of failure caused by the melting of the external metal insulating varnish at high temperatures. The metal wall panels 2 enhance the structural strength of the anti-arc flash cover, preventing damage under gas impact. The anti-arc flash cover also includes a metal ring plate 3 surrounding the insulating wall panel 1. The metal ring plate 3 connects the insulating wall panel 1 and the metal wall panel 2 and also shares some of the gas impact force borne by the insulating wall panel 1, thereby improving the structural strength of the insulating wall panel 1. The anti-arc flash cover also includes an insulating partition 4 disposed between two adjacent arc-extinguishing chambers 100. The insulating partition 4 prevents insulation breakdown between adjacent arc-extinguishing chambers 100.

[0084] A second aspect of this application provides a circuit breaker, as shown in the following embodiment. Figures 13 to 15 The circuit breaker includes a circuit breaker body 200, a plurality of arc-extinguishing chambers 100 mounted on the circuit breaker body 200, and an anti-arc flash cover as described in any of the above embodiments. The circuit breaker incorporates at least all the technical effects of the aforementioned anti-arc flash cover, which will not be elaborated further here.

[0085] Continue to refer to Figure 13 and Figure 14 The circuit breaker body 200 includes a base plate 210 and a base 220 that are fastened together, and also includes several pressure blocks 230 fixed to the top surface formed after the base plate 210 and the base 220 are fastened together. Each arc-extinguishing chamber 100 has a pressure block 230 on each side, and each arc-extinguishing chamber 100 is pressed and fixed to the top surface by the pressure blocks 230 on both sides. Furthermore, each arc-extinguishing chamber 100 has a protruding strip 110 on each side, and two adjacent protruding strips 110 are pressed to the top surface by the same pressure block 230. The protruding strip 110 located at the edge is pressed to the top surface by a single pressure block 230. This structure enables the arc-extinguishing chamber 100 to be installed and fixed on the circuit breaker body 200.

[0086] In some embodiments, the insulating spacer 4 and the pressure block 230 between two adjacent arc-extinguishing chambers 100 are in contact or plugged into each other. Specifically, between two adjacent arc-extinguishing chambers 100, the end of the insulating spacer 4 away from the insulating wall plate 1 abuts against or is inserted into the second slot on the pressure block 230, thereby preventing the individual chambers 5 from communicating with each other, further avoiding the problem of insulation breakdown between adjacent arc-extinguishing chambers 100.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. An anti-arc flash cover, used to cover the exhaust end of the arc-extinguishing chamber (100) of a circuit breaker; the anti-arc flash cover includes a plurality of wall panels, the plurality of wall panels enclosing to form the inner cavity of the anti-arc flash cover, characterized in that, The wall panel of the anti-arc shroud, which is opposite to the exhaust port of the arc extinguishing chamber (100), is an insulating wall panel (1), and the remaining wall panels of the anti-arc shroud are metal wall panels (2). The insulating wall panel (1) is provided with a first air outlet (11).

2. The anti-arc flyback cover according to claim 1, characterized in that, Multiple metal wall panels (2) are connected end to end to form a shell with openings at both ends, and the insulating wall panel (1) covers one opening of the shell.

3. The anti-arc flash cover according to claim 1 or 2, characterized in that, The anti-arc flash cover also includes a metal ring plate (3) fixedly connected between the insulating wall panel (1) and the metal wall panel (2); The metal ring plate (3) covers the periphery of the inner end face or the periphery of the outer end face of the insulating wall plate (1), and / or, the inner hole of the metal ring plate (3) is fitted onto the insulating wall plate (1).

4. The anti-arc flyback cover according to claim 3, characterized in that, The metal ring plate (3) covers the periphery of the outer end face of the insulating wall plate (1). The outer end face of the insulating wall plate (1) is provided with a protrusion that inserts into the inner hole of the metal ring plate (3). The outer end face of the protrusion and the outer end face of the metal ring plate (3) are coplanar. And / or, the metal wall panel (2) and the metal ring plate (3) are integrally formed by bending process; And / or, the metal ring plate (3) is provided with a plurality of first mounting holes (31), and the insulating wall plate (1) is provided with a plurality of second mounting holes (13), and the first mounting holes (31) and the second mounting holes (13) are connected in a one-to-one correspondence; And / or, the metal ring plate (3) is engaged with the insulating wall plate (1); And / or, the metal ring plate (3) is provided with reinforcing ribs (6).

5. The anti-arc flash cover according to claim 1 or 2, characterized in that, At least one of the metal wall panels (2) is provided with a second air outlet (21).

6. The anti-arc flash cover according to claim 5, characterized in that, The second air outlet (21) is not provided on the metal wall panel (2) on the same side as the operating end of the circuit breaker; And / or, the metal wall panels (2) located on both sides of the operating end of the circuit breaker are provided with the second air outlet (21); And / or, a second air outlet (21) is provided on the metal wall panel (2) opposite to the operating end of the circuit breaker.

7. The anti-arc flash cover according to claim 1 or 2, characterized in that, The number of arc-extinguishing chambers (100) is multiple, and the multiple arc-extinguishing chambers (100) are arranged side by side; the anti-arc cover also includes an insulating baffle (4), which extends from the insulating wall plate (1) to the arc-extinguishing chamber (100) and is placed between two adjacent arc-extinguishing chambers (100).

8. The anti-arc flyback cover according to claim 7, characterized in that, The insulating wall panel (1) and the insulating partition (4) are integrally formed; And / or, the insulating barrier (4) divides the inner cavity of the anti-arc cover into several independent compartments (5), and the compartments (5) are respectively covered on the exhaust end of the arc extinguishing chamber (100).

9. The anti-arc flash cover according to claim 1 or 2, characterized in that, At least one of the metal wall panels (2) is provided with a third mounting hole (22) for connecting the circuit breaker body (200) of the circuit breaker.

10. A circuit breaker, characterized in that, It includes an arc-extinguishing chamber (100) and an anti-arc flyback cover as described in any one of claims 1 to 9.

Images