High breaking arc discharge structure of hydraulic electromagnetic circuit breaker

Abstract

The utility model discloses a high breaking arc discharge structure of a hydraulic electromagnetic circuit breaker. The high breaking arc discharge structure comprises a circuit breaker shell, a moving contact, a static contact, an arc extinguish chamber, a first arc striking angle, a second arc striking angle and a magnetic blow-out assembly, the moving contact is movably installed in the circuit breaker shell, and the static contact, the arc extinguish chamber, the first arc striking angle, the second arc striking angle and the magnetic blow-out assembly are all fixed in the circuit breaker shell. The circuit breaker shell is provided with a first exhaust port and a second exhaust port which are communicated with the interior of the circuit breaker shell, the arc extinguish chamber is located between the first exhaust port and the second exhaust port, the first arc striking angle and the second arc striking angle are arranged at the two ends of the arc extinguish chamber respectively, and the moving contact swings between the first arc striking angle and the second arc striking angle; the magnetic blow-out assembly is located on the side face of the moving contact and located between the first arc striking angle and the second arc striking angle. Therefore, after the moving contact and the static contact are separated and separated, arc extinguishing can be rapidly carried out, gas generated during arc extinguishing can be rapidly discharged, and the safety of internal components of the circuit breaker can be effectively ensured.

Description

Technical Field

[0001] The utility model relates to the field of electrical protection equipment, in particular to a high breaking and arc exhausting structure of a hydraulic electromagnetic circuit breaker. Background Art

[0002] At present, small circuit breakers mainly adopt the thermal magnetic tripping principle. When short-circuit occurs, the gas generated by the arc is discharged unidirectionally, with slow gas flow. It is difficult for the arc to enter the arc extinguishing chamber or it takes a long time to enter, which accelerates the burning of the contacts and reduces the service life of the circuit breaker. At the same time, the utilization rate of the arc extinguishing grid is relatively low, and the short-circuit breaking capacity is relatively poor.

[0003] The prior art with the publication number CN205081028U discloses an arc extinguishing device for an air circuit breaker, which includes a housing and a grid combination arranged in the housing; the housing is composed of a bottom plate and two arc separating walls fixed on the bottom plate, the grid combination includes a plurality of arc extinguishing grids arranged at intervals, and the bottom plate is provided with exhaust holes; an arc leading device which is beneficial to the arc entering the grid combination is arranged at a position close to the moving and static contacts inside the housing, the arc leading device includes two relatively spaced gas generating plates and a magnetic conductor arranged on one side of each gas generating plate close to the arc separating wall, and an arc runway is formed between the two gas generating plates.

[0004] In the prior art, although the gas generating plate can generate a large amount of gas to improve the arc extinguishing efficiency, due to the instantaneous action of the gas generating plate, it causes the single exhaust hole to be unable to timely discharge the high-pressure and high-temperature gas, resulting in the high-pressure and high-temperature gas backflowing inside the circuit breaker, which easily leads to the failure of the circuit breaker structure; and it also reduces the arc extinguishing efficiency. Summary of the Utility Model

[0005] In order to solve the problems that in the prior art during arc extinguishing, the high-pressure and high-temperature gas easily backflows inside the circuit breaker and the exhaust efficiency of the circuit breaker is low, the purpose of the utility model is to provide a high breaking and arc exhausting structure of a hydraulic electromagnetic circuit breaker, which can improve the exhaust efficiency, improve the breaking capacity of the circuit breaker, and includes the internal structure of the circuit breaker.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions: a high breaking and arc exhausting structure of a hydraulic electromagnetic circuit breaker, which includes a circuit breaker housing, a moving contact, a static contact, an arc extinguishing chamber, a first arc leading angle, a second arc leading angle and a magnetic blowing component; the moving contact is movably installed inside the circuit breaker housing, and the static contact, the arc extinguishing chamber, the first arc leading angle, the second arc leading angle and the magnetic blowing component are all fixed inside the circuit breaker housing; the circuit breaker housing is provided with a first exhaust port and a second exhaust port communicated with its interior, the arc extinguishing chamber is located between the first exhaust port and the second exhaust port, the first arc leading angle and the second arc leading angle are respectively arranged at both ends of the arc extinguishing chamber, and the moving contact swings between the first arc leading angle and the second arc leading angle; the magnetic blowing component is located on the side of the moving contact and is between the first arc leading angle and the second arc leading angle.

[0007] Preferably, the two magnetic blow components are symmetrically arranged on both sides of the moving contact.

[0008] Preferably, the magnetic blow component includes a gas generating sheet and a magnetic conducting sheet. The magnetic conducting sheet is fixed on the gas generating sheet, and the gas generating sheet is fixedly connected to the breaker housing.

[0009] Preferably, the magnetic conducting sheet is arranged on the end face of the gas generating sheet facing away from the moving contact.

[0010] Preferably, an installation groove is arranged on the gas generating sheet, and the magnetic conducting sheet is arranged in the installation groove.

[0011] Preferably, a clamping groove is arranged on the gas generating sheet, and a clamping projection protrudes from the inner wall of the breaker housing. The clamping projection and the clamping groove are clamped to fix the gas generating sheet on the breaker housing.

[0012] Preferably, an arc extinguishing runway is arranged in the arc extinguishing chamber, and the first arc leading angle and the second arc leading angle are respectively arranged at both ends of the arc extinguishing runway.

[0013] Preferably, it includes two arc extinguishing end plates and a plurality of arc extinguishing grid plates. The arc extinguishing grid plates are arranged between the arc extinguishing end plates and are fixedly connected to the arc extinguishing end plates. The plurality of arc extinguishing grid plates cooperate to form.

[0014] Preferably, a breaking part is fixed in the breaker housing. The breaking part divides the internal cavity of the breaker housing into an arc extinguishing space and an operating space. The moving contact, the arc extinguishing chamber, the first arc leading angle, the second arc leading angle, and the magnetic blow component are all arranged in the arc extinguishing space. The first exhaust port and the second exhaust port are both communicated with the arc extinguishing space.

[0015] The beneficial effects of the technical solution of the present utility model are as follows: The above-mentioned breaker adopts a double-exhaust structure, and this double-exhaust structure can accelerate the flow of the gas generated during the breaking of the breaker, thereby greatly improving the time for the arc to enter the arc extinguishing chamber, reducing the burning of the contacts by the arc, and at the same time improving the utilization rate of the arc extinguishing chamber, and can effectively improve the breaking capacity of the breaker; When the moving contact and the static contact are separated, an arc is generated. The first arc leading angle and the magnetic blow component lead the arc away from the contact point and quickly push the arc towards the arc extinguishing chamber, thereby reducing the burning of the contacts; After the moving contact and the static contact are separated and broken, due to the magnetic blow component accelerating the arc to enter the arc extinguishing chamber, the arc extinguishing efficiency of the arc extinguishing chamber is improved, and since the two exhaust ports are respectively arranged on both sides of the arc extinguishing chamber, the gas generated during arc extinguishing can be quickly discharged, which can effectively protect the internal components of the breaker. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic structural diagram of a hydraulic electromagnetic breaker;

[0017] Figure 2 is a schematic structural diagram of the hydraulic electromagnetic breaker after removing the front housing;

[0018] Figure 3 It is a schematic structural diagram of a hydraulic electromagnetic circuit breaker after removing the front housing, an arc extinguishing end plate, and a group of magnetic blow components;

[0019] Figure 4 It is a schematic connection structure diagram of a product piece and a magnetic conductive plate.

[0020] Reference numerals: 1. Circuit breaker housing; 11. Rear housing; 12. Front housing; 13. Breaking part; 14. First exhaust port; 15. Second exhaust port; 16. Arc baffle;

[0021] 2. Arc extinguishing chamber; 21. Arc extinguishing end plate; 22. Arc extinguishing grid plate;

[0022] 3. First arc guiding angle; 4. Second arc guiding angle;

[0023] 5. Magnetic blow component; 51. Gas generating piece; 52. Magnetic conductive piece;

[0024] 6. Moving contact; 61. Electromagnetic coil; 62. Oil cup; 63. Armature; 64. Handle; 65. Tripping mechanism; 66. Moving contact rod. Detailed implementation manners

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", etc. are based on the orientation or positional relationship shown in the drawings, and are 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 thus should not be construed as limiting the present invention.

[0027] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more, unless otherwise clearly defined.

[0028] In the present utility model, unless otherwise clearly specified or limited, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components. 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.

[0029] In the present utility model, unless otherwise clearly specified or limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on the top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal level than the second feature. The first feature being "below", "beneath" and "under the bottom of" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal level than the second feature.

[0030] As Figures 1 to 3 shown, a high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker includes a circuit breaker housing 1, a moving contact 6, a static contact, an arc extinguishing chamber 2, a first arc guiding angle 3, a second arc guiding angle 4, and a magnetic blow component 5; the moving contact 6 is movably installed in the circuit breaker housing 1, and the static contact, the arc extinguishing chamber 2, the first arc guiding angle 3, the second arc guiding angle 4, and the magnetic blow component 5 are all fixed in the circuit breaker housing 1;

[0031] The circuit breaker housing 1 is provided with a first exhaust port 14 and a second exhaust port 15 that communicate with its interior. The arc extinguishing chamber 2 is located between the first exhaust port 14 and the second exhaust port 15. The first arc guiding angle 3 and the second arc guiding angle 4 are respectively arranged at both ends of the arc extinguishing chamber 2. The moving contact 6 swings between the first arc guiding angle 3 and the second arc guiding angle 4. The magnetic blow component 5 is located on the side of the moving contact 6 and is between the first arc guiding angle 3 and the second arc guiding angle 4.

[0032] With such a setting, the above circuit breaker adopts a double-exhaust structure, which can accelerate the flow of the gas generated during the opening of the circuit breaker, thereby greatly enhancing the time for the arc to enter the arc extinguishing chamber 2, reducing the burning of the contacts by the arc, and improving the utilization rate of the arc extinguishing chamber 2 at the same time, effectively enhancing the breaking capacity of the circuit breaker; when the moving contact 6 separates from the static contact, an arc is generated, and the first arc guiding angle 3 and the magnetic blowing component 5 draw the arc out from the contact point and quickly push the arc towards the arc extinguishing chamber 2, thereby reducing contact burning; after the moving contact 6 separates and breaks from the static contact, due to the magnetic blowing component 5 accelerating the arc into the arc extinguishing chamber 2, the arc extinguishing efficiency of the arc extinguishing chamber 2 is improved, and since the two exhaust ports are respectively arranged on both sides of the arc extinguishing chamber 2, the gas generated during arc extinguishing can be quickly discharged.

[0033] In this embodiment, as Figure 2 and Figure 3 shown, two sets of magnetic blowing components 5 are symmetrically arranged on both sides of the moving contact. With such a setting, the arc extinguishing effect of the above structure can be provided.

[0034] In this embodiment, as Figure 3 shown, the magnetic blowing component 5 includes a gas generating piece 51 and a magnetic conducting piece 52. The magnetic conducting piece 52 is fixed on the gas generating piece 51, and the gas generating piece 51 is fixed in the circuit breaker housing 1. With such a setting, when the static contact and the moving contact 6 separate, the high heat of the arc causes the gas to be released on both sides, pushing the arc towards the arc extinguishing chamber 2, thereby effectively reducing burning.

[0035] Further preferably, the magnetic conducting piece 52 is arranged on the end face of the gas generating piece 51 facing away from the moving contact 6.

[0036] Further preferably, as Figure 4 shown, an installation groove 512 is arranged on the end face of the gas generating piece 51 facing away from the moving contact 6, and the magnetic conducting piece is arranged in the installation groove 512.

[0037] Further preferably, as Figure 4 shown, a clamping groove 511 is arranged on the gas generating piece 51, and a clamping projection protrudes from the inner wall of the circuit breaker housing. The clamping projection and the clamping groove are clamped to fix the gas generating piece on the circuit breaker housing.

[0038] In this embodiment, as Figure 2 and Figure 3 shown, the arc extinguishing chamber 2 includes two arc extinguishing end plates 21 and a plurality of arc extinguishing grid plates 22. The arc extinguishing grid plates 22 are arranged between the arc extinguishing end plates 21, the arc extinguishing grid plates 22 are fixedly connected to the arc extinguishing end plates 21, and the plurality of arc extinguishing grid plates 22 cooperate to form an arc extinguishing runway. The first arc guiding angle 3 and the second arc guiding angle 4 are respectively arranged at both ends of the arc extinguishing runway.

[0039] In this embodiment, as Figure 2 and Figure 3As shown, a recessed area is provided at the top of the arc extinguishing chamber 2, and part of the magnetic blow component 5 is located within the recessed area. Such an arrangement can better guide the arc path.

[0040] Further preferably, the second arc ignition angle 4 is provided at the top of the arc extinguishing chamber 2, the recessed area is located between the first arc ignition angle 3 and the second arc ignition angle 4, and further preferably, the magnetic conductive sheet 52 is located within the recessed area; among the multiple arc extinguishing grid plates, the first arc extinguishing grid plate is located below the magnetic blow component, and the last arc extinguishing grid plate is located on the left side of the magnetic blow component.

[0041] In this embodiment, as Figure 2 and Figure 3 shown, a breaking part 13 is fixed within the circuit breaker housing 1. The breaking part 13 divides the internal cavity of the circuit breaker housing 1 into an arc extinguishing space and an operating space. One end of the moving contact rod with the moving contact 6 is inserted into the arc extinguishing space. The moving contact 6, the arc extinguishing chamber 2, the first arc ignition angle 3, the second arc ignition angle 4, and the magnetic blow component 5 are all arranged within the arc extinguishing space. The first exhaust port 14 and the second exhaust port 15 are both communicated with the arc extinguishing space. With such an arrangement, the breaking part divides the interior of the circuit breaker housing into two parts, thereby preventing the high-temperature gas pressure from flowing back into the operating space, and designing the arc extinguishing chamber 2 as a two-way exhaust type, which is convenient for the release of the arc gas pressure. It can effectively transfer the high gas pressure generated by the arc between the moving and static contacts to the low-pressure chamber on the arc extinguishing chamber 2 side quickly, avoiding the arc not easily entering the arc extinguishing chamber 2, and shortening the arc entry time. The arc is effectively cut off by the arc extinguishing grid, and the gas is quickly discharged to the outside of the circuit breaker through the two-way exhaust duct, which can effectively improve the breaking capacity of the circuit breaker during short circuit. Further, a baffle plate 16 for further providing a blocking ability is provided within the circuit breaker housing 1.

[0042] In this embodiment, as Figures 1 to 3 shown, the moving contact 6 is installed at the end of the moving contact rod 66, and a hydraulic electromagnetic breaking component for driving the moving contact rod 66 is provided within the operating space; the hydraulic electromagnetic breaking component includes an electromagnetic coil 61, an oil cup 62, an armature 63, a handle 64, and a tripping mechanism 65; the oil cup 62 is fixedly connected to the circuit breaker housing 1, the electromagnetic coil 61 is wound around the oil cup 62, one end of the electromagnetic coil 61 is connected to the moving contact rod, the other end of the electromagnetic coil 61 is connected to the outgoing line terminal, the armature 63 is hinged within the circuit breaker housing 1, the handle 64 is rotatably installed within the circuit breaker housing 1, and the handle 64 and the moving contact rod 66 are connected through the tripping mechanism 65. When the coil attracts the armature 63 to move, the armature 63 can drive the tripping mechanism 65 to unlock, causing the moving contact 6 and the static contact to break. Among them, the specific structure of the hydraulic electromagnetic breaking component can refer to the prior arts such as the patent publication numbers CN219106049U, CN115020160A, CN212648166U, CN215896286U, and CN117747371A, etc.

[0043] In this embodiment, asFigure 1 As shown in the figure, the circuit breaker housing 1 includes a front housing 12 and a rear housing 11. The front housing 12 and the rear housing 11 are fixedly connected and cooperate to form the inner cavity. Two sets of magnetic blowout assemblies are respectively arranged on the front housing 12 and the rear housing 11.

[0044] When the circuit breaker encounters a breaking current, during a short circuit, the electromagnetic coil 61 generates a magnetic field, attracting the armature 63 to close, unlocking the tripping mechanism 65, causing the moving and static contacts to separate and generate an arc. The arc magnetizes the entire arc extinguishing chamber 2 and the stepped arc angle. While the moving contact 6 separates, the high heat of the arc causes the gas generating sheets 51 on both sides to release gas, pushing the arc towards the arc extinguishing chamber 2. At the same time, the magnetic conductive sheet 52 and the stepped arc angle also lead the arc out from the contact point, reducing burn damage. After the moving and static contacts are completely disconnected, the arc baffle 16 divides the inside of the circuit breaker into two parts, preventing air pressure from flowing back. The arc extinguishing chamber 2 is designed as a two-way exhaust type, facilitating the release of the arc gas pressure. It can effectively transfer the high air pressure generated by the arc between the moving and static contacts to the low-pressure chamber on the arc extinguishing chamber 2 side quickly, avoiding the situation that the arc is not easy to enter the arc extinguishing chamber 2 and shortening the arc entry time. The arc extinguishing grid is used to effectively cut off the arc extinguishing, and the gas is quickly discharged to the outside of the circuit breaker through the two-way exhaust channel, which can effectively improve the short-circuit breaking capacity.

[0045] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0046] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and purposes of the present invention.

Claims

1. A high-breaking arc-discharging structure for a hydraulic electromagnetic circuit breaker, characterized in that: It includes a circuit breaker housing (1), a moving contact (6), a static contact, an arc extinguishing chamber (2), a first arcing horn (3), a second arcing horn (4), and a magnetic blowout assembly (5); the moving contact (6) is movably installed in the circuit breaker housing (1), and the static contact, the arc extinguishing chamber (2), the first arcing horn (3), the second arcing horn (4), and the magnetic blowout assembly (5) are all fixed in the circuit breaker housing (1); The circuit breaker housing (1) is provided with a first exhaust port (14) and a second exhaust port (15) that communicate with its interior. The arc extinguishing chamber (2) is located between the first exhaust port (14) and the second exhaust port (15). The first arcing horn (3) and the second arcing horn (4) are respectively arranged at both ends of the arc extinguishing chamber (2). The moving contact (6) swings between the first arcing horn (3) and the second arcing horn (4). The magnetic blowout assembly (5) is located on the side of the moving contact (6) and is between the first arcing horn (3) and the second arcing horn (4).

2. The high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 1, wherein: Two groups of magnetic blowout assemblies (5) are symmetrically arranged on both sides of the moving contact (6).

3. A high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 1, characterized in that: The magnetic blowout assembly (5) includes a gas generating sheet (51) and a magnetic conducting sheet (52). The magnetic conducting sheet (52) is fixed on the gas generating sheet (51), and the gas generating sheet (51) is fixedly connected to the circuit breaker housing (1).

4. A high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 3, characterized in that: The magnetic conducting sheet (52) is arranged on the end face of the gas generating sheet (51) facing away from the moving contact (6).

5. A high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 3, characterized in that: The gas generating sheet (51) is provided with a mounting groove (512), and the magnetic conducting sheet (52) is arranged in the mounting groove (512).

6. The high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 3, wherein: The gas generating sheet (51) is provided with a clamping groove (511), and a clamping projection protrudes from the inner wall of the circuit breaker housing (1). The clamping projection and the clamping groove (511) are clamped to fix the gas generating sheet (51) on the circuit breaker housing (1).

7. A high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 1, characterized in that: An arc extinguishing runway is arranged in the arc extinguishing chamber (2), and the first arcing horn (3) and the second arcing horn (4) are respectively arranged at both ends of the arc extinguishing runway.

8. A high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 7, characterized in that: It includes two arc extinguishing end plates (21) and a plurality of arc extinguishing grid plates (22). The arc extinguishing grid plates (22) are arranged between the arc extinguishing end plates (21), and the arc extinguishing grid plates (22) are fixedly connected to the arc extinguishing end plates (21). The plurality of arc extinguishing grid plates (22) cooperate to form...

9. The high-breaking arc-discharging structure of a hydraulic electromagnetic circuit breaker according to claim 1, characterized in that: A breaking part (13) is fixed in the circuit breaker housing (1). The breaking part (13) divides the internal cavity of the circuit breaker housing (1) into an arc extinguishing space and an operating space. The moving contact (6), the arc extinguishing chamber (2), the first arcing horn (3), the second arcing horn (4), and the magnetic blowout assembly (5) are all arranged in the arc extinguishing space. The first exhaust port (14) and the second exhaust port (15) are both communicated with the arc extinguishing space.

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