A planar magnetic blowout arc extinguishing structure and a circuit breaker

Abstract

The present invention provides a planar magnetic blowout arc extinguishing structure and a circuit breaker, wherein the planar magnetic blowout arc extinguishing structure comprises: a contact mechanism, an arc extinguishing chamber, a magnetic blowout piece and a positioning piece, wherein the magnetic blowout piece is pressed and arranged between a cover and a static contact; the positioning piece passes through the static contact and the magnetic blowout piece in sequence, and is used to limit the position of the magnetic blowout piece. Since the magnetic blowout piece is pressed and fixed between the cover and the static contact, and then positioned by the positioning piece, the magnetic blowout piece is not only quick and convenient to install, but also firmly installed; in addition, the cover can prevent the arc from running around and burning the static contact, thereby extending the service life of the static contact.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and particularly to a planar magnetic blowout arc extinguishing structure and a circuit breaker. Background Art

[0002] The molded case circuit breaker is a type of circuit breaker that can automatically cut off the current when the current exceeds the trip setting, and has protection functions such as long-time overload and instantaneous short-circuit. It can also be used in cooperation with modules such as leakage protectors, measuring devices, and electric operating mechanisms.

[0003] Currently, the primary task of circuit breaker interruption is to extinguish the arc generated when the moving and static contacts are disconnected. However, due to the existence of a critical current in the circuit breaker opening current, when the circuit breaker opening loop is near the critical current, the electromagnetic force generated by the arc itself is not sufficient to move the arc, often resulting in the arc continuously burning at the entrance of the arc extinguishing chamber. The arc cannot be quickly stretched into the arc extinguishing chamber, ultimately leading to the re-ignition of the arc and even the failure of interruption. In addition, the stagnation of the arc at the entrance of the arc extinguishing chamber will also cause serious ablation of the arc path and reduce the service life of the circuit breaker. To solve the above problems, by setting magnetic blowout pieces, the arc can be guided into the arc extinguishing chamber, thereby improving the arc extinguishing efficiency. However, the existing magnetic blowout pieces have the defects of cumbersome installation and high cost. Summary of the Invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of cumbersome installation and high cost of the magnetic blowout pieces in the prior art, so as to provide a planar magnetic blowout arc extinguishing structure with quick and convenient installation and low cost, and a circuit breaker with the planar magnetic blowout arc extinguishing structure.

[0005] To this end, the present invention provides a planar magnetic blowout arc extinguishing structure, including a contact mechanism, an arc extinguishing chamber, a magnetic blowout member, and a positioning member. The contact mechanism has a moving contact and a static contact that can be in contact and connected or separated and disconnected. The arc extinguishing chamber has a cover adapted to shield the static contact; a magnetic blowout member, tightly arranged between the cover and the static contact; a positioning member, sequentially passing through the static contact and the magnetic blowout member for defining the position of the magnetic blowout member.

[0006] The magnetic blowout member is positioned and connected to the base of the circuit breaker through a positioning structure. The positioning structure includes: a first through hole provided on the static contact; a second through hole provided on the magnetic blowout member and opposite to the first through hole; a positioning member, sequentially passing through the first through hole and the second through hole and then being positioned and connected to the magnetic blowout member.

[0007] The cover is detachably fixed to the static contact.

[0008] The cover is fixedly connected to the static contact through a hook structure, and the hook structure includes: a plurality of elastic hooks, which are arranged at the bottom of the cover. After the elastic hooks pass through the first through holes of the static contact, they can be hooked and connected with the bottom surface of the static contact.

[0009] It also includes a gas blowing member arranged in the arc extinguishing chamber and used for blowing the arc toward the arc extinguishing grid.

[0010] The gas blowing member comprises two gas producing plates which are arranged in parallel and extend into the arc extinguishing chamber, and a connecting plate connecting the two gas producing plates.

[0011] The connecting plate is arranged adjacent to the static contact bearing portion of the static contact, and can cover a portion of the static contact bearing portion and expose the static contact.

[0012] The bottom of the gas production plate abuts against the static contact, and the middle of the gas production plate has a positioning plate extending outward and abutting against the step of the corresponding arc extinguishing chamber side plate.

[0013] The arc extinguishing grid located at the bottom of the arc extinguishing chamber has an arc striking angle extending toward the static contact point and used for striking an arc.

[0014] The present invention also provides a circuit breaker, comprising the planar magnetic arc blowing-out structure as described above.

[0015] The technical solution of the present invention has the following advantages:

[0016] 1. The planar magnetic blowing arc extinguishing structure provided by the present invention includes a contact mechanism, an arc extinguishing chamber, a magnetic blowing part and an air blowing part. During assembly, the magnetic blowing part is first placed on the static contact, and then the cover is fixedly connected to the static contact, so that the magnetic blowing part is pressed and arranged between the cover and the bending part. In this way, the installation is quick and convenient; in addition, the cover can prevent the arc from running around and burning the static contact, thereby extending the service life of the static contact.

[0017] 2. In the planar magnetic blow-out arc extinguishing structure provided by the present invention, the positioning piece on the circuit breaker base passes through the first through hole of the static contact and the second through hole of the magnetic blow-out piece in sequence, and is then positioned and connected with the magnetic blow-out piece, thereby limiting the position of the magnetic blow-out piece, thus ensuring the magnetic blow-out effect.

[0018] 3. In the planar magnetic blow-out arc extinguishing structure provided by the present invention, the cover is fixedly connected to the bent portion by a hook structure, and the installation method using elastic hooks has the advantage of quick and convenient assembly and disassembly.

[0019] 4. In the planar magnetic arc extinguishing structure provided by the present invention, the connecting plate is arranged adjacent to the static contact bearing part, which can cover part of the static contact bearing part and expose the static contact. The connecting plate can prevent the arc from running around and burning the static contact, thereby extending the service life of the static contact.

[0020] 5. The planar magnetic blowout arc extinguishing structure provided by the present invention, during assembly, the bottom of the gas generating plate abuts against the bent portion, and the positioning plate in the middle thereof can abut against the step of the corresponding arc extinguishing chamber side plate, so that the gas blowing member is assembled with the arc extinguishing chamber. The above-mentioned gas blowing member has the advantages of simple structure, quick and convenient disassembly and assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order 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 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 invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0022] Figure 1 is a three-dimensional view of the planar magnetic blowout arc extinguishing structure of the present invention installed on a circuit breaker;

[0023] Figure 2 is Figure 1 a sectional view of;

[0024] Figure 3 is a three-dimensional view of the planar magnetic blowout arc extinguishing structure;

[0025] Figure 4 is an exploded structural schematic diagram of the planar magnetic blowout arc extinguishing structure;

[0026] Figure 5 is Figure 4 a structural schematic diagram after removing part of the side plate in;

[0027] Figure 6 is Figure 4 a sectional view of;

[0028] Figure 7 is an assembly schematic diagram of a static contact, a cover and a magnetic blowing member;

[0029] Figure 8 is an exploded schematic diagram of a static contact, a cover and a magnetic blowing member;

[0030] Figure 9 is a three-dimensional view of the gas blowing member.

[0031] Description of the reference numerals: 1. Moving contact; 2. Static contact; 21. Wiring part; 22. Bent part; 221. First through hole; 23. Static contact carrier part; 231. Vertical connection section; 232. Horizontal carrier section; 24. Static contact; 3. Arc extinguishing chamber; 31. Arc extinguishing grid; 310. Arc leading angle; 32. Side plate; 33. Step; 4. Cover; 40. Installation cavity; 41. First shielding part; 42. Second shielding part; 43. Elastic hook; 5. Magnetic blow component; 51. Second through hole; 6. Air blow component; 61. Gas generating plate; 62. Connection plate; 63. Positioning plate; 7. Base; 71. Positioning piece. Detailed implementation manners

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] In the description of the present invention, it should be noted that 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 accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0034] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0035] In addition, the technical features involved in different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0036] Embodiment

[0037] This embodiment provides a circuit breaker with a planar magnetic blow arc extinguishing structure disposed inside it, such as Figure 3 and 4As shown, the planar magnetic blowout arc extinguishing structure includes a contact mechanism, an arc extinguishing chamber 3, a cover 4, a magnetic blowout member 5 and a gas blowout member 6.

[0038] The contact mechanism includes a moving contact 1 and a stationary contact 2 that can be connected or disconnected. Figure 7 and 8 As shown, the static contact 2 includes a wiring portion 21, a bending portion 22 and a static contact bearing portion 23 which are connected in sequence, the bending portion 22 has a first connecting section which is inclined and connected to the wiring portion 21, and a second connecting section which is connected to the first connecting section and the static contact bearing portion 23 and is arranged in a flat plate, a first through hole 221 being formed on the second connecting section, the static contact bearing portion 23 has a vertical connecting section 231 connected to the second connecting section, and a transverse bearing section 232 which extends to above the first through hole 221 and is suitable for arranging the static contact 24.

[0039] The cover 4 is arranged at the bottom of the arc extinguishing chamber 3. Figure 8 As shown, the cover 4 is detachably fixedly mounted on the bending portion 22 through a hook structure, and is suitable for shielding the bending portion 22. The hook structure includes: a plurality of elastic hooks 43, which are arranged at the bottom of the cover 4. After the elastic hooks 43 pass through the first through hole 221, they can be hooked and connected with the bottom surface of the bending portion 22. In this embodiment, the cross section of the cover 4 has a first shielding portion 41 in the shape of a Chinese character "几", and a second shielding portion 42 which is arranged along an inclination and connected to the first shielding portion 41. The two side edges of the first shielding portion 41 in the shape of a Chinese character "几" are fitted and abutted against the bending portion 22, and the middle part thereof is enclosed with the bending portion 22 to form an installation cavity 40 suitable for installing the magnetic blowing part 5. In this embodiment, the cover 4 is formed with a third through hole for the static contact bearing portion 23 to pass through.

[0040] The magnetic blowing member 5 is in the shape of a flat plate and is disposed between the transverse bearing section 232 and the bending portion 22. The magnetic blowing member 5 is disposed along the width direction of the bending portion 22. A second through hole 51 is disposed in the middle of the magnetic blowing member 5 and is disposed opposite to the first through hole 221. Figure 1 and 2 As shown, the positioning member 71 on the base 7 passes through the first through hole 221 and the second through hole 51 in sequence, and is then positioned and connected with the magnetic blowing member 5 .

[0041] Arc extinguishing chamber 3, such as Figure 5 As shown, a plurality of arc extinguishing grids 31 are arranged therein, and the arc extinguishing grids 31 located at the bottom of the arc extinguishing chamber 3 have arc striking angles 310 extending toward the static contact 24 for striking an arc. The arc extinguishing chamber 3 has side plates 32 arranged opposite to each other on both sides, and a step 33 is arranged in the middle of the side plates 32.

[0042] The gas blowing member 6 is arranged in the arc extinguishing chamber 3. The gas blowing member can generate gas when the circuit breaker is disconnected, thereby generating an airflow to blow the arc toward the arc extinguishing grid, so that the arc extinguishing effect is better. Figure 3 , 4 As shown in FIG. 9 , the gas blowing member 6 includes two gas production plates 61 arranged in parallel and extending into the arc extinguishing chamber 3, and a connecting plate 62 connecting the two gas production plates 61. The connecting plate 62 is arranged adjacent to the static contact bearing portion 23, as shown in FIG. Figure 6 As shown, it can cover part of the static contact bearing portion 23 and expose the static contact 24. The bottom of the gas production plate 61 abuts against the bent portion 22, and the middle part thereof has a positioning plate 63 extending outward and abutting against the step 33 of the side plate 32 of the arc extinguishing chamber 3.

[0043] As a convertible embodiment, the bent portion 22 is formed with a groove which is recessed downward and suitable for mounting the magnetic blowing component 5 .

[0044] The planar magnetic blowing arc extinguishing structure provided by the present invention comprises a contact mechanism, an arc extinguishing chamber 3, a magnetic blowing member 5 and an air blowing member 6. During assembly, the magnetic blowing member 5 is first placed on the bending portion 22, and then the cover 4 is fixedly connected to the bending portion 22, so that the magnetic blowing member 5 is pressed and arranged between the cover 4 and the bending portion 22, so that the installation is quick and convenient; in addition, the cover 4 can prevent the arc from running around and burning the static contact 2, thereby extending the service life of the static contact; in addition, by arranging the air blowing member 6, the gas-producing member can generate gas when the circuit breaker is disconnected, thereby generating an airflow to blow the arc toward the arc extinguishing grid 31, so that the arc extinguishing effect is better.

[0045] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A planar magnetic blowout arc extinguishing structure, comprising a contact mechanism and an arc extinguishing chamber (3). The contact mechanism has a moving contact (1) and a static contact (2) that can be in contact and connected or separated and disconnected. The arc extinguishing chamber (3) is provided with a cover (4) adapted to shield the static contact (2), and is characterized in that, Further included are: A magnetic blow component (5) disposed between the cover (4) and the static contact (2). A second through hole (51) is provided on the magnetic blow component (5), and a first through hole (221) is provided on the static contact (2). The first through hole (221) and the second through hole (51) are oppositely arranged. The magnetic blow component (5) is positioned and connected to the base (7) of the circuit breaker through a positioning structure. A positioning component (71) sequentially passes through the first through hole (221) on the static contact (2) and the second through hole (51) of the magnetic blow component (5), and is positioned and connected to the magnetic blow component (5). The positioning component (71) is used to define the position of the magnetic blow component (5). An air blow component (6) disposed in the arc extinguishing chamber (3) for blowing the arc towards the arc extinguishing grid plates (31). The air blow component (6) includes two gas generating plates (61) arranged in parallel and extending into the arc extinguishing chamber (3), and a connecting plate (62) connecting the two gas generating plates (61). The connecting plate (62) is disposed adjacent to the static contact bearing portion (23) of the static contact (2), and can block part of the static contact bearing portion (23) and expose the static contact (24).

2. The planar magnetic blowout arc extinguishing structure according to claim 1, characterized in that, The cover (4) is detachably fixed to the static contact (2).

3. The planar magnetic blowout arc extinguishing structure according to claim 2, characterized in that, The cover (4) is fixedly connected to the static contact (2) through a hook structure, and the hook structure includes: A plurality of elastic hooks (43) are disposed at the bottom of the cover (4). After passing through the first through hole (221) of the static contact (2), the elastic hooks (43) can be hooked and connected to the bottom surface of the static contact (2).

4. The planar magnetic blowout arc extinguishing structure according to any one of claims 1 to 3, characterized in that, The bottom of the gas generating plate (61) abuts against the static contact (2), and a positioning plate (63) extending outward and abutting against the step (33) of the corresponding side plate (32) of the arc extinguishing chamber (3) is provided in the middle thereof.

5. The planar magnetic blowout arc extinguishing structure according to any one of claims 1 to 3, characterized in that, The arc extinguishing grid plates (31) located at the bottom of the arc extinguishing chamber (3) have an arc leading angle (310) extending towards the static contact (24) for leading the arc.

6. A circuit breaker, characterized in that, It includes the planar magnetic blow arc extinguishing structure according to any one of claims 1-5.

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