Arc extinguishing device and circuit breaker

Abstract

The utility model relates to the technical field of low-voltage electric appliances, in particular to an arc extinguishing device and a circuit breaker. The arc extinguishing device comprises a contact mechanism, an arc extinguishing chamber and an insulating part, the contact mechanism comprises a static contact and a plurality of moving contacts distributed side by side, the plurality of moving contacts are divided into a plurality of arc moving contacts and a plurality of active contacts, and one ends of the plurality of arc moving contacts extend into an arc extinguishing cavity of the arc extinguishing chamber; the insulating part comprises a baffle plate and a rib plate, the baffle plate is arranged between the plurality of active contact pieces and the arc extinguish chamber, a winding air channel is formed between the baffle plate and the side wall of the arc extinguish chamber, one end of the rib plate is connected to the baffle plate, and the other end of the rib plate extends towards the extension direction of the movable contact piece and is inserted between the adjacent arc movable contact piece and the active contact piece. In the using process, the winding air channel can deionize charged particles while performing pressure relief on the arc extinguishing cavity, and the rib plate can prevent the charged particles from being transferred to an active area of the active contact piece, so that the breaking performance and the arc extinguishing effect of the device are improved.

Description

Technical Field

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

[0002] In the existing low-voltage electrical appliance field, the DC breaking capacity can only reach DC1500V. However, in the current market, there are already customers requiring that low-voltage electrical appliances can reach DC2000 - 2500V. Therefore, the existing products can no longer meet the customer needs and urgently need to be updated. According to the latest development plan of the low-voltage electrical appliance industry standard, the breaking voltage of circuit breaker products will develop to AC2000V and DC3000V.

[0003] At present, although the circuit breaker with arc contacts on the market can introduce the arc generated after the circuit breaker is disconnected into the arc extinguishing chamber, with the increase of the breaking voltage, the breaking difficulty increases accordingly. This also causes the arc or charged particles generated after the circuit breaker is disconnected to easily overflow from the arc extinguishing chamber, generating an arc between the moving and static contacts adjacent to the arc contact, resulting in the failure of current breaking. In severe cases, it will also cause the moving and static contacts to be punctured.

[0004] Therefore, how to prevent the arc or charged particles from overflowing from the arc extinguishing chamber and enable the product to have excellent breaking performance has become a technical problem that needs to be solved urgently by those skilled in the art. Summary of the Utility Model

[0005] The first object of the utility model is to provide an arc extinguishing device to solve the technical problem that the arc or charged particles generated after the circuit breaker is disconnected in the existing technology easily overflow from the arc extinguishing chamber, generating an arc between the moving and static contacts adjacent to the arc contact, resulting in the failure of current breaking. In severe cases, it will also cause the moving and static contacts to be punctured.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] An arc extinguishing device includes a contact mechanism, an arc extinguishing chamber and an insulating member, wherein:

[0008] The contact mechanism includes a static contact and a plurality of moving contact pieces arranged side by side. The plurality of moving contact pieces are divided into several arc moving contact pieces and several main moving contact pieces. One end of the several arc moving contact pieces extends into the arc extinguishing cavity of the arc extinguishing chamber;

[0009] The insulating member includes a baffle and a rib plate; the baffle is arranged between the several main moving contact pieces and the arc extinguishing chamber, and a meandering air duct is formed between the baffle and the side wall of the arc extinguishing chamber; one end of the rib plate is connected to the baffle, and the other end of the rib plate extends in the extending direction of the moving contact piece and is inserted between the adjacent arc moving contact piece and the main moving contact piece.

[0010] Further, the number of the rib plates is two, and the plurality of arc moving contacts are arranged between the two rib plates.

[0011] Further, a plurality of first convex strips are arranged on a surface of the baffle plate close to the arc extinguishing chamber;

[0012] And / or, a plurality of second convex strips are arranged on a surface of a side wall of the arc extinguishing chamber close to the baffle plate.

[0013] Further, a plurality of first convex strips are arranged on a surface of the baffle plate close to the arc extinguishing chamber, and a plurality of second convex strips are arranged on a surface of a side wall of the arc extinguishing chamber close to the baffle plate; the plurality of first convex strips and the plurality of second convex strips are arranged in a staggered manner.

[0014] Further, a gas generating member is arranged on a side wall of the arc extinguishing chamber, and the second convex strip is arranged on the gas generating member.

[0015] Further, a plurality of third convex strips are arranged on a surface of the rib plate close to the arc moving contact;

[0016] And / or, an insulating protective shell is coated on the abdomen of the arc moving contact, and a plurality of fourth convex strips are arranged on a surface of the insulating protective shell close to the rib plate.

[0017] Further, the length of the arc moving contact is greater than the length of the main moving contact; one end of the arc moving contact having an arc moving contact penetrates through the baffle plate and extends into the arc extinguishing cavity of the arc extinguishing chamber.

[0018] Further, the contact mechanism further includes a moving contact support, and the plurality of moving contacts are arranged side by side on the moving contact support; a rib plate slot for inserting the rib plate is arranged on the moving contact support.

[0019] Further, the insulating member further includes a bottom insulating plate, and the bottom insulating plate is arranged at one ends of the baffle plate and the rib plate close to the static contact; a protective space is formed by enclosing the baffle plate, the rib plate and the bottom insulating plate, and one end of the main moving contact having a main moving contact moves in the protective space.

[0020] The second object of the present invention is to provide a circuit breaker, including the arc extinguishing device described in any one of the above.

[0021] The beneficial effects of the present invention:

[0022] The present utility model provides an arc extinguishing device and a circuit breaker. The arc extinguishing device includes a contact mechanism, an arc extinguishing chamber, and an insulating member, wherein: The contact mechanism includes a static contact and a plurality of dynamic contact pieces arranged side by side. The plurality of dynamic contact pieces are divided into a plurality of arc dynamic contact pieces and a plurality of main dynamic contact pieces. One end of the plurality of arc dynamic contact pieces extends into the arc extinguishing cavity of the arc extinguishing chamber; The insulating member includes a baffle plate and a rib plate. The baffle plate is arranged between the plurality of main dynamic contact pieces and the arc extinguishing chamber. A meandering air duct is formed between the baffle plate and the side wall of the arc extinguishing chamber. One end of the rib plate is connected to the baffle plate, and the other end of the rib plate extends in the extending direction of the dynamic contact piece and is inserted between adjacent arc dynamic contact pieces and main dynamic contact pieces.

[0023] During the use of the above device, the gas overflowing from the arc extinguishing cavity flows into the air duct on the side of the arc dynamic contact piece, and the arc extinguishing cavity is timely depressurized through the air duct, avoiding the problem that the static and dynamic contacts are damaged or the arc continues to burn due to the reverse impact of the gas on the static and dynamic contacts, and improving the breaking performance of the arc extinguishing device; Since the air duct is meandering, it can effectively block the charged particles in the gas, thereby improving the arc extinguishing effect; The rib plate can block the arc and / or charged particles overflowing from the arc extinguishing cavity, avoiding the transfer of the arc and / or charged particles to the active area of the main dynamic contact piece, thereby avoiding the problems of current breaking failure and breakdown of the main dynamic contact piece, and further improving the breaking performance of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 It is a three-dimensional structure schematic diagram of the arc extinguishing device provided by the embodiment of the present utility model;

[0026] Figure 2 It is an assembly schematic diagram of the insulating member and the gas generating member provided by the embodiment of the present utility model;

[0027] Figure 3 It is a structural schematic diagram of the arc dynamic contact piece and the insulating protective shell provided by the embodiment of the present utility model;

[0028] Figure 4 It is an assembly schematic diagram of a plurality of dynamic contact pieces, a static contact, and an insulating member provided by the embodiment of the present utility model.

[0029] ICON:

[0030] 1 - Contact mechanism; 11 - Static contact; 111 - Arc static contact point; 112 - Main static contact point; 12 - Arc moving contact piece; 13 - Active moving contact piece; 14 - Moving contact support; 141 - Rib slot;

[0031] 2 - Arc extinguishing chamber; 21 - Gas generating component; 211 - Second convex strip;

[0032] 3 - Insulating component; 31 - Baffle; 311 - First convex strip; 32 - Rib; 321 - Third convex strip; 33 - Bottom insulating plate;

[0033] 4 - Air duct;

[0034] 5 - Insulating protective shell; 51 - Fourth convex strip;

[0035] 6 - Protection space. Detailed implementation mode

[0036] Next, the technical solution of the present utility model will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative work belong to the scope of protection of the present utility model.

[0037] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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, so it cannot be understood as a limitation of the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that in the description of the present utility model, the terms "connection" and "installation" 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 directly connected, or connected through an intermediate medium; it can be a mechanical connection, or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] An embodiment of the present utility model provides an arc extinguishing device. Referring to Figure 1 and Figure 2 , the device includes a contact mechanism 1, an arc extinguishing chamber 2, and an insulating component 3, where:

[0040] The contact mechanism 1 includes a static contact 11 and a plurality of moving contact pieces arranged side by side. The plurality of moving contact pieces are divided into several arc moving contact pieces 12 and several main moving contact pieces 13; one end of the several arc moving contact pieces 12 extends into the arc extinguishing cavity of the arc extinguishing chamber 2;

[0041] The insulating part 3 includes a baffle 31 and a rib plate 32; the baffle 31 is arranged between the several main moving contact pieces 13 and the arc extinguishing chamber 2, and a winding air duct 4 is formed between the baffle 31 and the side wall of the arc extinguishing chamber 2; one end of the rib plate 32 is connected to the baffle 31, and the other end of the rib plate 32 extends in the extending direction of the moving contact piece and is inserted between the adjacent arc moving contact piece 12 and the main moving contact piece 13.

[0042] During the use of the above device, when the current is disconnected, the arc moving contact piece 12 can introduce the arc into the arc extinguishing cavity of the arc extinguishing chamber 2, so that the arc is cut and extinguished in the arc extinguishing cavity; at this time, there is a large amount of gas carrying high-temperature charged particles in the arc extinguishing cavity, and these gases will inevitably overflow reversely from the cavity opening of the arc extinguishing cavity; the overflowing gas will first flow into the air duct 4 on the side of the arc moving contact piece 12, and the arc extinguishing cavity is depressurized in time through the air duct 4, avoiding the problem that the gas impacts the static and moving contacts reversely, resulting in damage to the static and moving contacts or continuous combustion of the arc, and improving the breaking performance of the arc extinguishing device; because the air duct 4 is winding, it can effectively deionize the charged particles in the gas, deionize the charged particles while the gas leaks out, thereby improving the arc extinguishing effect.

[0043] In addition, since the rib plate 32 is inserted between the adjacent arc moving contact piece 12 and the main moving contact piece 13, the rib plate 32 can block the arc and / or charged particles overflowing from the arc extinguishing cavity, avoiding the transfer of the arc and / or charged particles to the moving area of the main moving contact piece 13, thereby avoiding the problems of current breaking failure and breakdown of the main moving contact piece 13, and further improving the breaking performance of the device.

[0044] Continue to refer to Figure 1 , in this embodiment, the number of rib plates 32 is two, and several arc moving contact pieces 12 are arranged between the two rib plates 32. A plurality of main moving contact pieces 13 are arranged on one side of each rib plate 32 away from the arc moving contact piece 12.

[0045] It should be noted that the numbers of the arc moving contact pieces 12 and the main moving contact pieces 13 are adjusted according to the product model and usage requirements, and are not limited here.

[0046] Continue to refer to Figure 1 and Figure 2, the length of the arc moving contact 12 is greater than that of the main moving contact 13; one end of the arc moving contact 12 penetrates through the baffle 31 and extends into the arc extinguishing chamber of the arc extinguishing chamber 2; correspondingly, a through hole for the arc moving contact 12 to penetrate through is provided on the baffle 31. An arc static contact 111 and a main static contact 112 are provided on the static contact 11, wherein: the arc static contact 111 is located in the arc extinguishing chamber, and the arc moving contact on the arc moving contact 12 can contact or separate from the arc static contact 111; the main static contact 112 is located on the side of the baffle 31 away from the arc extinguishing chamber 2 and on the side of the rib plate 32 away from the arc moving contact 12, and the main contact on the main moving contact 13 can contact or separate from the main static contact 112.

[0047] During the use of the above device, when the current is disconnected, the baffle 31 and the rib plate 32 can block the gas carrying charged particles from flowing to the active area of the main moving contact 13, avoiding the problem of breakdown of the main and static contacts and improving the breaking performance of the arc extinguishing device; the air duct 4 between the baffle 31 and the arc extinguishing chamber 2 plays a role in relieving pressure and deionizing charged particles, deionizing the charged particles in the air duct 4 while allowing the gas to leak out, thereby improving the arc extinguishing effect.

[0048] Continue to refer to Figure 1 , the contact mechanism 1 further includes a moving contact support 14, and a plurality of moving contacts are arranged side by side on the moving contact support 14; a rib plate slot 141 for inserting the rib plate 32 is provided on the moving contact support 14.

[0049] In this embodiment, the number of the rib plate slots 141 is two and corresponds to the two rib plates 32 one by one; one end of the rib plate 32 is inserted into the corresponding rib plate slot 141, and the other end is connected to the baffle 31, so that the main and static contacts and the arc moving and static contacts can be completely separated, preventing the arc and / or charged particles from transferring to the main and static contacts.

[0050] Continue to refer to Figure 2 , a plurality of first ridges 311 are provided on the surface of the baffle 31 close to the arc extinguishing chamber 2;

[0051] and / or, a plurality of second ridges 211 are provided on the surface of the side wall of the arc extinguishing chamber 2 close to the baffle 31.

[0052] In this embodiment, by providing ridges on the inner wall surface of the air duct 4, the air duct 4 extends in a meandering shape to improve the blocking effect on charged particles.

[0053] On the basis of the above structure, a plurality of first ridges 311 are provided on one side of the baffle 31 close to the arc extinguishing chamber 2, and a plurality of second ridges 211 are provided on one side of the side wall of the arc extinguishing chamber 2 close to the baffle 31; the plurality of first ridges 311 and the plurality of second ridges 211 are arranged in an interleaved manner. The above structure forms a certain maze shape for the free gas generated in the arc moving and static contact areas to diffuse, thereby increasing the difficulty for charged particles to overflow from the air duct 4. While ensuring that the air duct 4 has a good pressure relief effect, a good deionization effect is guaranteed.

[0054] Continue to refer to Figure 2 , a gas generating member 21 is provided on the side wall of the arc extinguishing chamber 2, and the second ridge 211 is provided on the gas generating member 21.

[0055] Refer to Figure 2 and Figure 3 , a plurality of third ridges 321 are provided on one side of the rib plate 32 close to the moving arc contact 12;

[0056] And / or, the abdomen of the moving arc contact 12 is coated with an insulating protective shell 5, and a plurality of fourth ridges 51 are provided on one side of the insulating protective shell 5 close to the rib plate 32.

[0057] In the above structure, the insulating protective shell 5 can provide insulation protection for the abdomen of the moving arc contact 12, avoiding breakdown of the moving arc contact 12; the arrangement of the third ridges 321 and the fourth ridges 51 forms a meandering gap between the moving arc contact 12 and the rib plate 32, so as to avoid charged particles from overflowing through the gap between the moving arc contact 12 and the rib plate 32, further improving the breaking performance of the device.

[0058] On the basis of the above structure, the plurality of third ridges 321 and the plurality of fourth ridges 51 are arranged in an interleaved manner, further increasing the difficulty for charged particles to overflow.

[0059] Refer to Figure 4 , the insulating member 3 further includes a bottom insulating plate 33, and the bottom insulating plate 33 is arranged at one end of the baffle 31 and the rib plate 32 close to the static contact 11; the baffle 31, the rib plate 32 and the bottom insulating plate 33 enclose a protective space 6, and the end of the moving main contact 13 with the main contact moves within the protective space 6. The bottom insulating plate 33 is used to prevent air flow from diffusing from below the baffle 31 and the rib plate 32 to the active and static contacts, so as to achieve a complete arc isolation effect between the active and static contacts during the movement of the moving contact.

[0060] In this embodiment, one end of the bottom insulating plate 33 extends below the arc extinguishing chamber 2, and a positioning plate is arranged below the bottom insulating plate 33; during installation, the positioning plate is first inserted into the static contact 11 or the circuit breaker housing, and then the arc extinguishing chamber 2 is placed above the bottom insulating plate 33, and the installation of the insulating member 3 is completed.

[0061] In summary, during the operation of the arc extinguishing device provided by the present application, one end of the arc moving contact piece 12 with the arc moving contact moves in the arc extinguishing chamber and contacts or separates from the arc static contact 111, and one end of the active contact piece 13 with the active contact moves in the protection space 6 and contacts or separates from the main static contact 112; after the current is disconnected, the protection space 6 can isolate the arc in the active and static contact areas, preventing charged particles from spilling into the active and static contact areas, thereby improving the breaking performance of the device; the gaps between the insulating protective shell 5 and the rib plates 32 and the air ducts 4 are all serpentine, so that while relieving the pressure in the arc extinguishing chamber, it can effectively block the spillage of charged particles, further improving the arc extinguishing effect of the device.

[0062] The second aspect embodiment of the present invention provides a circuit breaker, and the circuit breaker includes the arc extinguishing device described in any of the above embodiments. Therefore, the circuit breaker at least has the technical effects of the above arc extinguishing device, which will not be elaborated here.

[0063] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An arc extinguishing device, characterized in that, It includes a contact mechanism (1), an arc extinguishing chamber (2) and an insulating member (3), wherein: The contact mechanism (1) includes a static contact (11) and a plurality of moving contact pieces arranged side by side. The plurality of moving contact pieces are divided into several arc moving contact pieces (12) and several main moving contact pieces (13). One end of the several arc moving contact pieces (12) extends into the arc extinguishing cavity of the arc extinguishing chamber (2); The insulating member (3) includes a baffle plate (31) and a rib plate (32); the baffle plate (31) is arranged between the several main moving contact pieces (13) and the arc extinguishing chamber (2), and a winding air duct (4) is formed between the baffle plate (31) and the side wall of the arc extinguishing chamber (2); one end of the rib plate (32) is connected to the baffle plate (31), and the other end of the rib plate (32) extends in the extending direction of the moving contact piece and is inserted between the adjacent arc moving contact piece (12) and the main moving contact piece (13).

2. The arc extinguishing device according to claim 1, characterized in that, The number of the rib plates (32) is two, and the several arc moving contact pieces (12) are arranged between the two rib plates (32).

3. The arc extinguishing device according to claim 1, characterized in that, A plurality of first convex strips (311) are arranged on the surface of the baffle plate (31) close to the arc extinguishing chamber (2); And / or, a plurality of second convex strips (211) are arranged on the surface of the side wall of the arc extinguishing chamber (2) close to the baffle plate (31).

4. The arc extinguishing device according to claim 3, characterized in that, A plurality of first convex strips (311) are arranged on the surface of the baffle plate (31) close to the arc extinguishing chamber (2), and a plurality of second convex strips (211) are arranged on the surface of the side wall of the arc extinguishing chamber (2) close to the baffle plate (31); the plurality of first convex strips (311) and the plurality of second convex strips (211) are arranged alternately.

5. The arc extinguishing device according to claim 4, characterized in that, A gas generating member (21) is arranged on the side wall of the arc extinguishing chamber (2), and the second convex strip (211) is arranged on the gas generating member (21).

6. The arc extinguishing device according to claim 1, characterized in that, A plurality of third convex strips (321) are arranged on the surface of the rib plate (32) close to the arc moving contact piece (12); And / or, the abdomen of the arc moving contact piece (12) is coated with an insulating protective shell (5), and a plurality of fourth convex strips (51) are arranged on the surface of the insulating protective shell (5) close to the rib plate (32).

7. The arc extinguishing device according to claim 1, characterized in that, The length of the arc moving contact piece (12) is greater than the length of the main moving contact piece (13); one end of the arc moving contact piece (12) with an arc moving contact point penetrates through the baffle plate (31) and extends into the arc extinguishing cavity of the arc extinguishing chamber (2).

8. The arc extinguishing device according to claim 1, characterized in that, The contact mechanism (1) further includes a moving contact support (14), and the plurality of moving contact pieces are arranged side by side on the moving contact support (14); a rib plate slot (141) for inserting the rib plate (32) is arranged on the moving contact support (14).

9. The arc extinguishing device according to claim 1, characterized in that, The insulating member (3) further includes a bottom insulating plate (33), and the bottom insulating plate (33) is arranged at one end of the baffle plate (31) and the rib plate (32) close to the static contact (11); the baffle plate (31), the rib plate (32) and the bottom insulating plate (33) enclose a protective space (6), and one end of the main moving contact piece (13) with a main contact point moves in the protective space (6).

10. A circuit breaker, characterized in that, Comprising the arc extinguishing device according to any one of claims 1 to 9.

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