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 insulating cover and an arc extinguishing chamber, the contact mechanism comprises a static contact, a plurality of moving contact pieces and a moving contact support, and the moving contact pieces are arranged on the moving contact support side by side; the insulating cover and the moving contact support are buckled and connected, an installation cavity is defined between the insulating cover and the moving contact support, one end of each moving contact piece is located in the installation cavity, and the other end of each moving contact piece extends towards the arc extinguish chamber; the insulating cover comprises an airflow baffle plate which is arranged opposite to the arc extinguish chamber. The gas flow baffle is used for blocking gas flowing out of the arc extinguish chamber in the reverse direction, the gas is prevented from entering the cavity of the circuit breaker, then electrical elements in the cavity of the circuit breaker are protected from being impacted by the gas and eroded by charged particles, and the safety performance of products is 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, some customers require that low-voltage electrical appliances can reach DC2000 - 2500V. Therefore, the existing products can no longer meet the customer needs and urgent replacement is needed. 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] With the increase of the breaking voltage, the breaking difficulty increases accordingly. This also leads to a large amount of gas carrying high-temperature charged particles generated in the arc extinguishing chamber after the circuit breaker is disconnected. The gas that cannot be discharged in time from the rear of the arc extinguishing chamber will flow back out of the arc extinguishing chamber, and then the gas carrying high-temperature charged particles will enter the cavity of the circuit breaker, impacting the electrical components in the cavity and affecting the safety performance of the circuit breaker. Summary of the Utility Model

[0004] The first object of the utility model is to provide an arc extinguishing device to solve the technical problem that the gas carrying high-temperature charged particles in the existing technology enters the cavity of the circuit breaker and affects the safety performance of the circuit breaker.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] An arc extinguishing device includes a contact mechanism and an arc extinguishing chamber. The contact mechanism includes a static contact, a plurality of moving contact pieces and a moving contact support. The plurality of moving contact pieces are arranged side by side on the moving contact support. It further includes an insulating cover. The insulating cover and the moving contact support are snap-connected and an installation cavity is formed between them. One ends of the plurality of moving contact pieces are located in the installation cavity, and the other ends of the plurality of moving contact pieces all extend towards the arc extinguishing chamber. The insulating cover includes an air flow baffle, and the air flow baffle is arranged opposite to the arc extinguishing chamber.

[0007] Further, an expansion groove is arranged on the surface of the air flow baffle close to the arc extinguishing chamber.

[0008] Further, the insulating cover further includes a bottom plate and a rib plate connected between the air flow baffle and the bottom plate.

[0009] Further, the rib plate has a hollow structure, and the rib plate and the through hole on the air flow baffle cooperate to form the expansion groove.

[0010] Further, an arc extinguishing element is arranged in the expansion groove.

[0011] Further, the insulating cover further includes two side plates, the two side plates are respectively connected to opposite sides of the bottom plate, and the moving contact support is clamped between the two side plates.

[0012] Further, the contact mechanism further includes a rotating shaft, and the plurality of moving contact pieces, the moving contact support, and the two side plates are all sleeved on the rotating shaft.

[0013] Further, the number of the moving contact pieces is multiple and is divided into a plurality of arc-shaped moving contact pieces and a plurality of main moving contact pieces, and one end of the plurality of arc-shaped moving contact pieces extends into the arc extinguishing cavity of the arc extinguishing chamber;

[0014] The arc extinguishing device further includes an insulating arc separating member, the insulating arc separating member includes a partition plate, and the partition plate extends from the arc extinguishing chamber towards the moving contact support and is inserted between the adjacent arc-shaped moving contact piece and the main moving contact piece.

[0015] Further, a partition plate slot for inserting the partition plate is provided on the moving contact support; the distance range between one end of the partition plate close to the moving contact support and the air flow baffle is 0-2 mm.

[0016] 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.

[0017] The beneficial effects of the present invention:

[0018] The present invention provides an arc extinguishing device and a circuit breaker. The arc extinguishing device includes a contact mechanism, an insulating cover, and an arc extinguishing chamber. Among them: the contact mechanism includes a static contact, a plurality of moving contact pieces, and a moving contact support, and the plurality of moving contact pieces are arranged side by side on the moving contact support; the insulating cover and the moving contact support are buckled and connected, and an installation cavity is formed between the two. One ends of the plurality of moving contact pieces are all located in the installation cavity, and the other ends of the plurality of moving contact pieces all extend towards the arc extinguishing chamber; the insulating cover includes an air flow baffle, and the air flow baffle is arranged opposite to the arc extinguishing chamber.

[0019] During the working process of the device, when the current is disconnected, a large amount of gas carrying high-temperature charged particles will be generated in the arc extinguishing chamber. Most of these gases are discharged to the outside from the rear of the arc extinguishing chamber, and the remaining gases impact towards the moving contact pieces from the front of the arc extinguishing chamber; the function of the air flow baffle is to block the gas flowing out of the arc extinguishing chamber in the reverse direction, prevent this part of the gas from entering the cavity inside the circuit breaker, and further protect the electrical components in the cavity of the circuit breaker from the impact of the gas and the erosion of the charged particles, thereby improving the safety performance of the product. Description of the Drawings

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0021] Figure 1 Schematic cross-sectional view of the arc extinguishing device provided by an embodiment of the present invention;

[0022] Figure 2 Schematic three-dimensional structure view of the insulating cover provided by an embodiment of the present invention;

[0023] Figure 3 Schematic three-dimensional structure view of the arc extinguishing device from one angle provided by an embodiment of the present invention;

[0024] Figure 4 Schematic three-dimensional structure view of the arc extinguishing device from another angle provided by an embodiment of the present invention;

[0025] Figure 5 Assembly schematic view of multiple moving contact pieces, static contacts, and insulating arc separating members provided by an embodiment of the present invention.

[0026] Icon:

[0027] 1 - Contact mechanism; 11 - Static contact; 111 - Arc static contact point; 112 - Main static contact point; 12 - Arc moving contact piece; 13 - Main moving contact piece; 14 - Moving contact support; 141 - Partition slot; 15 - Rotating shaft;

[0028] 2 - Insulating cover; 21 - Airflow baffle; 22 - Expansion slot; 23 - Bottom plate; 24 - Rib plate; 25 - Side plate;

[0029] 3 - Arc extinguishing chamber;

[0030] 4 - Insulating arc separating member; 41 - Partition; 42 - Baffle; 43 - Bottom insulating plate; 44 - Top insulating plate;

[0031] 5 - Arc extinguishing piece;

[0032] 6 - Protection space. Specific embodiments

[0033] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the described embodiments are some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0034] It should be noted that in the description of the present utility model, the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It 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. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0035] 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.

[0036] An embodiment of the present utility model provides an arc extinguishing device. Referring to Figure 1 and Figure 2 , the arc extinguishing device includes a contact mechanism 1, an insulating cover 2, and an arc extinguishing chamber 3, wherein: the contact mechanism 1 includes a static contact 11, a plurality of moving contact pieces, and a moving contact support 14. The plurality of moving contact pieces are arranged side by side on the moving contact support 14; the insulating cover 2 and the moving contact support 14 are snap-connected and an installation cavity is formed between them. One ends of the plurality of moving contact pieces are all located in the installation cavity, and the other ends of the plurality of moving contact pieces all extend towards the arc extinguishing chamber 3; the insulating cover 2 includes an air flow baffle 21, and the air flow baffle 21 is disposed opposite to the arc extinguishing chamber 3.

[0037] During the working process of the device, when the current is disconnected, a large amount of gas carrying high-temperature charged particles will be generated in the arc extinguishing chamber 3. Most of these gases are discharged to the outside from the rear of the arc extinguishing chamber 3, and the remaining gases impact towards the direction of the moving contact pieces from the front of the arc extinguishing chamber 3; the function of the air flow baffle 21 is to block the gas flowing out of the arc extinguishing chamber 3 in the reverse direction, preventing this part of the gas from entering the cavity inside the circuit breaker, thereby protecting the electrical components in the circuit breaker cavity from the impact of the gas and the erosion of charged particles, and improving the safety performance of the product.

[0038] Furthermore, an expansion groove 22 is provided on the surface of the air flow baffle 21 close to the arc extinguishing chamber 3. The expansion groove 22 is used to accommodate the gas flowing out of the arc extinguishing chamber 3 in the reverse direction, so as to avoid excessive air pressure between the insulating cover 2 and the arc extinguishing chamber 3 and cause the gas to overflow from the connection gap.

[0039] Further, the insulating cover 2 further includes a bottom plate 23 and a rib plate 24 connected between the air flow baffle 21 and the bottom plate 23. On the basis of the above structure, the rib plate 24 has a hollow structure, and the rib plate 24 cooperates with the through holes on the air flow baffle 21 to form an expansion groove 22.

[0040] The rib plate 24 provided in this embodiment can, on the one hand, play a role in connecting the air flow baffle 21 and the bottom plate 23, improve the structural strength of the air flow baffle 21, and prevent the air flow baffle 21 from shaking or even being damaged under the impact of gas; on the other hand, it expands the capacity of the expansion groove 22, enabling the expansion groove 22 to accommodate more gas.

[0041] Further, an arc extinguishing member 5 is provided in the expansion groove 22. The function of the arc extinguishing member 5 is to eliminate the charged particles in the gas, so that the charged ions entering the expansion groove 22 cannot leave, thereby improving the arc extinguishing effect of the device.

[0042] Optionally, the arc extinguishing member 5 is a metal wire wound into a ball. The peripheral edge of the notch of the expansion groove 22 protrudes inward to form an annular retaining ring; the arc extinguishing member 5 is inserted into the expansion groove 22 through deformation and cannot escape from the groove under the block of the annular retaining ring.

[0043] Continue to refer to Figure 2 , the insulating cover 2 further includes two side plates 25, the two side plates 25 are respectively connected to the opposite sides of the bottom plate 23, and the moving contact support 14 is clamped between the two side plates 25, and the insulating cover 2 is connected to the moving contact support 14 through the two side plates 25.

[0044] Refer to Figure 3 , the contact mechanism 1 further includes a rotating shaft 15, and a plurality of moving contact pieces, the moving contact support 14 and the two side plates 25 are all sleeved on the rotating shaft 15; thus, the moving contact pieces can rotate around the axis of the rotating shaft 15.

[0045] Refer to Figure 4 and Figure 5 , the number of moving contact pieces is multiple and is divided into a plurality of arc-shaped moving contact pieces 12 and a plurality of main moving contact pieces 13, and one end of the plurality of arc-shaped moving contact pieces 12 extends into the arc extinguishing chamber of the arc extinguishing chamber 3;

[0046] The arc extinguishing device further includes an insulating arc separating member 4, and the insulating arc separating member 4 includes a partition plate 41, and the partition plate 41 extends from the arc extinguishing chamber 3 towards the moving contact support 14 and is inserted between adjacent arc-shaped moving contact pieces 12 and main moving contact pieces 13.

[0047] It should be noted that the number of the arc-shaped moving contact pieces 12 and the main moving contact pieces 13 is adjusted according to the product model and usage requirements, and is not limited herein.

[0048] Specifically, an arc static contact point 111 and a main static contact point 112 are provided on the static contact 11, where: the arc static contact point 111 is located in the arc extinguishing chamber, and the arc moving contact point on the arc moving contact piece 12 can contact or separate from the arc static contact point 111; the main static contact point 112 is located on the side of the partition 41 away from the arc moving contact piece 12, and the main contact point on the main moving contact piece 13 can contact or separate from the main static contact point 112.

[0049] In the above structure, since the partition 41 is inserted between the adjacent arc moving contact pieces 12 and the main moving contact pieces 13, the partition 41 can block the arc and / or charged particles in the moving area of the arc moving contact piece 12, avoiding the transfer of the arc and / or charged particles to the moving area of the main moving contact piece 13, thus avoiding the problems of current breaking failure and breakdown of the main moving contact piece 13, and improving the breaking performance of the device.

[0050] In this embodiment, the number of partitions 41 is two, and several arc moving contact pieces 12 are arranged between the two partitions 41. Several main moving contact pieces 13 are arranged on the side of each partition 41 away from the arc moving contact piece 12.

[0051] Continue to refer to Figure 5 Also, the insulating arc separating member 4 further includes a baffle 42. The baffle 42 is arranged between several main moving contact pieces 13 and the arc extinguishing chamber 3. One end of several arc moving contact pieces 12 penetrates through the baffle 42 and extends into the arc extinguishing chamber of the arc extinguishing chamber 3; the end of the partition 41 close to the arc extinguishing chamber 3 is connected to the baffle 42. The baffle 42 is used to separate the main moving contact pieces 13 from the arc extinguishing chamber 3. Through the cooperation of the partition 41 and the baffle 42, the moving area of the main moving contact pieces 13 is separated from the arc extinguishing chamber 3 and the moving area of the arc moving contact pieces 12, thus preventing charged particles from spreading to the main and static contact points.

[0052] Furthermore, the insulating arc separating member 4 further includes a bottom insulating plate 43. The bottom insulating plate 43 is arranged at the ends of the partition 41 and the baffle 42 close to the static contact 11; the partition 41, the baffle 42 and the bottom insulating plate 43 enclose a protection space 6, and the end of the main moving contact piece 13 with the main contact point moves in the protection space 6. The bottom insulating plate 43 is used to prevent air flow from overflowing from below the partition 41 and the baffle 42 to the main and static contact points, so as to achieve a complete arc isolation effect between the main and static contact points during the movement of the moving contact piece.

[0053] Furthermore, the insulating arc separating member 4 further includes a top insulating plate 44. The top insulating plate 44 is arranged at the ends of the partition 41 and the baffle 42 away from the static contact 11. The top insulating plate 44 is used to prevent air flow from overflowing from above the partition 41 and the baffle 42 to the main and static contact points, further improving the isolation effect of the protection space 6.

[0054] Continue to refer to Figure 4, a partition slot 141 for inserting the partition 41 is provided on the moving contact support 14. In this embodiment, the number of partition slots 141 is two and corresponds to the two partitions 41 one by one; one end of the partition 41 is inserted into the corresponding partition slot 141, and the other end is connected to the baffle 42, so that the main and static contacts and the arcing moving and static contacts can be completely separated, preventing the arc and / or charged particles from transferring to the main and static contacts.

[0055] Continue to refer to Figure 1 , the distance between the end of the partition 41 close to the moving contact support 14 and the air flow baffle 21 ranges from 0 to 2 mm. In this embodiment, the air flow baffle 21 is arc-shaped, and the surface of the partition 41 close to the moving contact support 14 is also arc-shaped. The two oppositely arranged arc-shaped surfaces can prevent interference between each other during the rotation of the insulating cover 2; the distance between the above two arc-shaped surfaces is between 0 and 2 mm. This distance can effectively block the overflow of charged particles while avoiding the partition 41 affecting the rotation of the insulating cover 2, and can also accommodate machining and assembly errors.

[0056] Based on the above structure, the notch of the expansion slot 22 is located between the two partitions 41; in the state where the static contact 11 and the moving contact piece are separated, the end of the air flow baffle 21 far from the moving contact support 14 (i.e., the lower end in the figure) extends beyond the bottom insulating plate 43 or is flush with the bottom insulating plate 43. In this way, the air flow baffle 21 and the two partitions 41 can effectively block the gas flowing out of the arc extinguishing chamber 3 in the reverse direction, causing this part of the gas to rush into the expansion slot 22, and eliminating the charged particles in the gas through the arc extinguishing element 5 in the expansion slot 22, thus preventing this part of the gas from impacting the electrical components in the circuit breaker cavity and also preventing the charged particles from eroding the electrical components in the cavity, improving the safety performance of the product.

[0057] An embodiment of the second aspect of the present invention provides a circuit breaker, which 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.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, not to limit them; 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, comprising a contact mechanism (1) and an arc extinguishing chamber (3), wherein the contact mechanism (1) includes a static contact (11), a plurality of moving contact pieces, and a moving contact support (14), and the plurality of moving contact pieces are arranged side by side on the moving contact support (14), characterized in that, It further includes an insulating cover (2). The insulating cover (2) is snap-connected to the moving contact support (14), and an installation cavity is formed between them. One ends of the plurality of moving contact pieces are all located in the installation cavity, and the other ends of the plurality of moving contact pieces all extend towards the arc extinguishing chamber (3); The insulating cover (2) includes an air flow baffle (21), and the air flow baffle (21) is disposed opposite to the arc extinguishing chamber (3).

2. The arc extinguishing device according to claim 1, characterized in that, An expansion groove (22) is provided on a surface of the air flow baffle (21) close to the arc extinguishing chamber (3).

3. The arc extinguishing device according to claim 2, characterized in that, The insulating cover (2) further includes a bottom plate (23) and a rib plate (24) connected between the air flow baffle (21) and the bottom plate (23).

4. The arc extinguishing device according to claim 3, characterized in that The rib plate (24) has a hollow structure, and the rib plate (24) cooperates with through holes on the air flow baffle (21) to form the expansion groove (22).

5. The arc extinguishing device according to claim 2, characterized in that, An arc extinguishing member (5) is disposed in the expansion groove (22).

6. The arc extinguishing device according to claim 3, characterized in that, The insulating cover (2) further includes two side plates (25). The two side plates (25) are respectively connected to opposite sides of the bottom plate (23), and the moving contact support (14) is clamped between the two side plates (25).

7. The arc extinguishing device according to claim 6, characterized in that, The contact mechanism (1) further includes a rotating shaft (15). The plurality of moving contact pieces, the moving contact support (14), and the two side plates (25) are all sleeved on the rotating shaft (15).

8. The arc extinguishing device according to claim 1, characterized in that, The number of the moving contact pieces is multiple and is divided into a plurality of arc moving contact pieces (12) and a plurality of main moving contact pieces (13). One ends of the plurality of arc moving contact pieces (12) extend into the arc extinguishing cavity of the arc extinguishing chamber (3); The arc extinguishing device further includes an insulating arc separating member (4). The insulating arc separating member (4) includes a partition plate (41). The partition plate (41) extends from the arc extinguishing chamber (3) towards the moving contact support (14) and is inserted between adjacent arc moving contact pieces (12) and main moving contact pieces (13).

9. The arc extinguishing device according to claim 8, characterized in that, A partition slot (141) for inserting the partition plate (41) is provided on the moving contact support (14); The distance range between one end of the partition plate (41) close to the moving contact support (14) and the air flow baffle (21) is 0 to 2 mm.

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

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