CN116153731B - Static end structure and circuit breaker using same - Google Patents
Static end structure and circuit breaker using same Download PDFInfo
- Publication number
- CN116153731B CN116153731B CN202211089820.3A CN202211089820A CN116153731B CN 116153731 B CN116153731 B CN 116153731B CN 202211089820 A CN202211089820 A CN 202211089820A CN 116153731 B CN116153731 B CN 116153731B
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- static
- supporting shell
- protective sleeve
- end structure
- end supporting
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
- H01H73/02—Details
- H01H73/04—Contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/62—Heating or cooling of contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H1/00—Contacts
- H01H1/64—Protective enclosures, baffle plates, or screens for contacts
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The application relates to a static end structure and a circuit breaker using the same, belonging to the field of electrical equipment, aiming at the problems, the application adopts the following technical scheme: a static end structure comprises a cylindrical static end supporting shell, a static arc contact arranged at the central shaft of the static end supporting shell, a shielding cover tightly matched with the static end supporting shell, a contact finger tightly matched between the shielding cover and the static end supporting shell, and a cross beam arranged at the bottom end of the static end supporting shell; the static arc contact is arranged on the cross beam, and the surface of the cross beam is coated with a protective sleeve; a plurality of round holes are circumferentially distributed on the shielding cover; a plurality of strip-shaped holes are circumferentially distributed on the contact finger, and each round hole is matched with at least one strip-shaped hole; the protective sleeve is a polytetrafluoroethylene piece, and the thickness of the protective sleeve is 6-10mm. The polytetrafluoroethylene protective sleeve has good high temperature resistance, can isolate the impact of high-temperature, high-speed and high-pressure air flow on the cross beam, effectively reduces metal dust, and ensures the insulation performance and the breaking performance of the circuit breaker; the round hole is adapted to the strip-shaped hole, so that the heat dissipation capacity of the static end supporting shell is improved.
Description
Technical Field
The application belongs to the field of electrical equipment, and particularly relates to a static end structure and a circuit breaker using the same.
Background
The current static end support is limited by the current capacity, the cost and the processing difficulty, an aluminum structure is adopted in most of the existing static end support, and when a static arc contact breaks away from the throat of a nozzle in the process of breaking off high-capacity short-circuit current, high-temperature, high-speed and high-pressure air flow is blown to the static side from the nozzle, so that the aluminum structure is easy to burn and erode when being impacted by high-temperature gas, and the bottom structure of the static end is damaged; in addition, a large amount of metal dust is generated after ablation, which deteriorates insulation and breaking performance of the circuit breaker. Therefore, there is a need for improved dead end structures to address the problem of severe ablation of the aluminum dead end support tail.
Disclosure of Invention
The application provides a static end structure and a circuit breaker using the same, aiming at the technical problem that the static end structure of the existing aluminum circuit breaker is easy to ablate.
The application adopts the following technical scheme: a dead end structure comprising:
the static end supporting shell is cylindrical, and a cross beam is arranged at the bottom end of the static end supporting shell;
the static arc contact is arranged at the central shaft of the static end supporting shell and is arranged on the cross beam through a connecting piece;
the protective sleeve is used for coating the surface of the cross beam;
the shielding cover is tightly matched with the outer end of the static end supporting shell, and a plurality of round holes are circumferentially distributed on the shielding cover;
the contact finger is tightly matched between the shielding cover and the static end supporting shell, a plurality of strip-shaped holes are circumferentially distributed on the contact finger, and a contact finger sheet is formed between two adjacent strip-shaped holes;
each round hole is matched with at least one strip-shaped hole;
the protective sleeve is a polytetrafluoroethylene piece, and the thickness of the protective sleeve is 6-10mm.
The beam can provide enough strength to support the static arc contact, the polytetrafluoroethylene protective sleeve has good high temperature resistance, can separate the impact of high-temperature, high-speed and high-pressure air flow on the beam, effectively reduces metal dust, and ensures the insulativity and breaking performance of the circuit breaker; the round hole adaptation bar hole, the heat of quiet end support shell outer end department can be through bar hole and round hole effluvium, improves quiet end support shell's heat dispersion, and then improves quiet end structural stability.
Further, the shielding cover is provided with an outer edge, and the outer edge is bent inwards to form an annular flange; the contact finger comprises an arc section and a bending section, the strip-shaped hole extends from the edge of the bending section to the arc section, the edge of the bending section is abutted to the annular flange, and the arc section is at least partially tightly matched between the shielding cover and the static end supporting shell.
Further, the shielding cover is provided with an annular wall connected with the outer edge, the round hole is formed in the annular wall, and the outer surface of the annular wall is flush with the outer surface of the static end supporting shell.
Further, a first step is arranged at the outer end of the static end supporting shell, the annular wall is tightly matched with the first step, the first step comprises a first limiting surface axially arranged and a first abutting surface radially arranged, the end part of the annular wall abuts against the first abutting surface, and an annular groove is formed in the first limiting surface; the annular wall can deform inwards under the action of external force to form limiting parts which are arranged continuously or at intervals, and the limiting parts are embedded in the annular groove, so that the static end supporting shell is tightly matched with the shielding cover.
Further, the outer end of the static end supporting shell is provided with a second step adjacent to the first step, the circular arc section is tightly matched with the second step, the second step comprises a second limiting surface axially arranged and a second abutting surface radially arranged, an annular step is arranged on the inner surface of the annular wall and is axially clamped with the second abutting surface, and the circular arc section is radially pressed by the annular step, so that the circular arc section is tightly matched with the second limiting surface.
Further, the shield case is provided with a first inclined surface and a second inclined surface, the first inclined surface is located at the end portion of the annular wall and faces the first step, and the second inclined surface is located on the annular step and faces the second step.
Further, an assembly hole for the connecting piece to pass through is formed in the cross beam, the protective sleeve is U-shaped, a through hole matched with the assembly hole in position is formed in the protective sleeve, a hollow protruding end is arranged at the end part of the static arc contact, and the protruding end penetrates through the through hole and is inserted into the assembly hole so as to be fixed on the cross beam through the connecting piece.
Further, the static arc contact is provided with a ring surface, the ring surface is adjacent to the protruding end, and when the connecting piece is connected with the protruding end, the ring surface presses on the protective sleeve.
Further, the outer surface of the outer edge is an arc surface.
The application has the beneficial effects that: the application relates to a static end structure and a circuit breaker using the same, wherein a beam adopted by the circuit breaker can provide enough strength to support a static arc contact, and a polytetrafluoroethylene protective sleeve has good high-temperature resistance, can isolate high-temperature, high-speed and high-pressure air flow from impacting the beam, effectively reduces metal dust, and ensures the insulativity and breaking performance of the circuit breaker; the round hole adaptation bar hole, the heat of quiet end support shell outer end department can be through bar hole and round hole effluvium, improves quiet end support shell's heat dispersion, and then improves quiet end structural stability.
Drawings
FIG. 1 is a schematic view of the dead end structure of example 1;
FIG. 2 is a schematic view of the cross-sectional structure in the direction A-A in FIG. 1;
FIG. 3 is a schematic side view of the stationary end structure of embodiment 1;
FIG. 4 is a schematic structural view of a stationary end support housing;
FIG. 5 is a schematic view of the internal structure of the shield;
FIG. 6 is a schematic structural view of a protective sleeve;
in the figure: 1-a static end supporting shell; 11-a cross beam; 111-fitting holes; 12-a first step; 121-a first limiting surface; 122-a first interference surface; 123-an annular groove; 13-a second step; 131-a second limiting surface; 132-a second interference surface; 2-static arc contacts; 21-a protruding end; 22-torus; 3-protecting sleeve; 31-perforating; 4-shielding case; 41-round holes; 42-outer edge; 421-annular rim; 422-arc surface; 43-a circumferential wall; 431-annular step; 432-a first inclined surface; 433-a second inclined surface; 5-contact fingers; 51-bar-shaped holes; 52-arc segments; 53-bending section.
Detailed Description
The technical solutions of the embodiments of the present application will be explained and illustrated below with reference to the drawings of the present application, but the following embodiments are only preferred embodiments of the present application, and not all the embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present application.
Example 1
The present embodiment is a dead-end structure, as shown in fig. 1 to 6, including:
the static end supporting shell 1 is cylindrical, a cross beam 11 is arranged at the bottom end of the static end supporting shell 1, and semicircular through holes are formed in two sides of the cross beam 11;
the static arc contact 2 is arranged at the central shaft of the static end supporting shell 1 and is arranged on the cross beam 11 through a fastening bolt;
a protective sleeve 3 for coating the surface of the cross beam 11;
the shielding cover 4 is tightly matched with the outer end of the static end supporting shell 1, and a plurality of round holes 41 are circumferentially distributed on the shielding cover 4;
the contact finger 5 is tightly matched between the shielding cover 4 and the static end supporting shell 1, a plurality of strip-shaped holes 51 are circumferentially distributed on the contact finger 5, and a contact finger sheet is formed between two adjacent strip-shaped holes 51;
each circular hole 41 is fitted with at least one of said strip-shaped holes 51;
the protective sleeve 3 is a polytetrafluoroethylene piece, and the thickness of the protective sleeve is 6-10mm.
The beam 11 can provide enough strength to support the static arc contact 2, the semicircular through holes increase the gas through-flow capacity of the static end support shell 1 so as to facilitate the rapid diffusion and cooling of high-temperature gas, the polytetrafluoroethylene protective sleeve 3 has good high-temperature resistance, can block the impact of high-temperature, high-speed and high-pressure gas flow on the beam 11, effectively reduce metal dust, and ensure the insulativity and breaking performance of the circuit breaker; the round hole 41 is matched with the strip-shaped hole 51, and heat at the outer end of the static end supporting shell 1 can be dissipated through the strip-shaped hole 51 and the round hole 41, so that the heat dissipation capacity of the static end supporting shell 1 is improved, and the stability of a static end structure is further improved.
When the circuit breaker is in a closing state, the static arc contact 2 and the contact finger 5 play a role in through flow, and the shielding cover 4 surrounds the outer side of the contact finger 5 to play a role in optimizing electric field distribution; in the opening process, the contact fingers 5 are separated at first, current is transferred to the static arc contact 2, after the static arc contact 2 is separated from the moving arc contact, an electric arc is formed between the static arc contact 2 and the moving arc contact, the temperature of gas near the static arc contact 2 is rapidly increased, after the static arc contact 2 is separated from the throat of the nozzle, high-temperature gas is blown out along the direction from the nozzle to the static arc contact 2, high-temperature, high-pressure and high-speed air flow is formed, and the bottom of the static end supporting shell 1 is impacted and ablated.
The shielding cover 4 is provided with an outer edge 42, and the outer edge 42 is inwards bent to form an annular flange 421; the contact finger 5 comprises an arc section 52 and a bending section 53, the strip-shaped hole 51 extends from the edge of the bending section 53 to the arc section 52, the edge of the bending section 53 is abutted against the annular flange 421, and the arc section 52 is at least partially tightly fitted between the shielding cover 4 and the static end supporting shell 1. The arc section 52 is clamped by the shielding cover 4 and the static end supporting shell 1 to form radial limit, the bending section 53 is abutted against the annular flange 421 to form axial limit, and therefore the contact finger 5 cannot easily fall off to form a stable structure.
The shielding cover 4 is provided with a circular wall 43 connected with the outer edge 42, the circular hole 41 is positioned on the circular wall 43, and the outer surface of the circular wall 43 is flush with the outer surface of the static end supporting shell 1. The arrangement can ensure the consistency of the outer part of the whole static end structure, and the appearance is attractive.
The outer end of the static end supporting shell 1 is provided with a first step 12, the annular wall 43 is tightly matched with the first step 12, the first step 12 comprises a first limiting surface 121 axially arranged and a first abutting surface 122 radially arranged, the end part of the annular wall 43 abuts against the first abutting surface 122, and an annular groove 123 is formed in the first limiting surface 121; the annular wall 43 can deform inwards under the action of external force to form a limiting part which is continuously arranged or arranged at intervals, and the limiting part is embedded in the annular groove 123, so that the static end supporting shell 1 is tightly matched with the shielding cover 4. The limiting part formed under the action of external force has the riveting effect, and radial pressing force is formed between the shielding cover 4 and the static end supporting shell 1 so as to prevent the shielding cover 4 from easily falling off.
The outer end of the static end supporting shell 1 is provided with a second step 13 adjacent to the first step 12, the circular arc section 52 is tightly matched with the second step 13, the second step 13 comprises a second limiting surface 131 axially arranged and a second abutting surface 132 radially arranged, the inner surface of the annular wall 43 is provided with an annular step 431, the annular step 431 is axially clamped with the second abutting surface 132, and the circular arc section 52 is radially pressed by the annular step 431, so that the circular arc section 52 is tightly matched with the second limiting surface 131. Because the annular step 431 protrudes from the inner surface of the annular wall 43, an inward pressing force is formed on the contact finger 5, and the contact finger 5 is tightly matched on the static end supporting shell 1; when the contact finger 5 and the shielding case 4 are assembled in sequence, the annular step 431 simultaneously forms axial positioning and radial close-fitting force at the second step 13, so that interference can be avoided, and stable structure can be ensured.
The shield case 4 is provided with a first inclined surface 432 and a second inclined surface 433, the first inclined surface 432 is located at an end of the annular wall 43 and faces the first step 12, and the second inclined surface 433 is located on the annular step 431 and faces the second step 13. The design of inclined plane is convenient to assemble, reduces friction and produces the foreign matter.
The beam 11 is provided with an assembly hole 111 for the fastening bolt to pass through, the protective sleeve 3 is U-shaped, a through hole 31 which is matched with the position of the assembly hole 111 is arranged on the protective sleeve, the end part of the static arc contact 2 is provided with a hollow protruding end 21, and the protruding end 21 passes through the through hole 31 to be inserted into the assembly hole 111 so as to be fixed on the beam 11 through the connecting piece. The U-shaped protective sleeve 3 is used for coating three sides of the cross beam 11, can effectively isolate high-temperature, high-speed and high-pressure air flow, and can realize the assembly of the static end support shell 1, the static arc contact 2 and the protective sleeve 3 only by locking a connecting piece when the static arc contact 2 is assembled, so that reliable connection and no looseness are ensured.
The static arcing contact 2 is provided with a ring surface 22, the ring surface 22 is adjacent to the protruding end 21, and when a connecting piece (fastening bolt) is connected with the protruding end 21, the ring surface 22 is pressed on the protective sleeve 3. This arrangement allows the protective sheath 3 to be compressed by the static arcing contact 2, preventing the protective sheath 3 from falling off.
The outer surface of the outer edge 42 is an arc surface 422, so that the electric field value of the end part of the static arc contact 2 is effectively reduced, and the reliability of the product is improved.
Example 2
The embodiment is a circuit breaker, which has a static end structure and a dynamic end structure, and the static end structure is the static end structure of embodiment 1.
While the application has been described in terms of specific embodiments, it will be appreciated by those skilled in the art that the application is not limited thereto but includes, but is not limited to, those shown in the drawings and described in the foregoing detailed description. Any modifications which do not depart from the functional and structural principles of the present application are intended to be included within the scope of the appended claims.
Claims (10)
1. A dead end structure, comprising:
the static end supporting shell is cylindrical, and a cross beam is arranged at the bottom end of the static end supporting shell;
the static arc contact is arranged at the central shaft of the static end supporting shell and is arranged on the cross beam through a connecting piece;
the protective sleeve is used for coating the surface of the cross beam;
the shielding cover is tightly matched with the outer end of the static end supporting shell, and a plurality of round holes are circumferentially distributed on the shielding cover;
the contact finger is tightly matched between the shielding cover and the static end supporting shell, a plurality of strip-shaped holes are circumferentially distributed on the contact finger, and a contact finger sheet is formed between two adjacent strip-shaped holes;
each round hole is matched with at least one strip-shaped hole;
the protective sleeve is a polytetrafluoroethylene piece, and the thickness of the protective sleeve is 6-10mm.
2. The stationary end structure of claim 1, wherein the shield has an outer edge that is inwardly bent to form an annular flange; the contact finger comprises an arc section and a bending section, the strip-shaped hole extends from the edge of the bending section to the arc section, the edge of the bending section is abutted to the annular flange, and the arc section is at least partially tightly matched between the shielding cover and the static end supporting shell.
3. The stationary end structure of claim 2 wherein said shield has an annular wall connected to said outer rim, said circular aperture being located in said annular wall, an outer surface of said annular wall being flush with an outer surface of said stationary end support housing.
4. The stationary end structure according to claim 3, wherein a first step is arranged at the outer end of the stationary end supporting shell, the first step comprises a first limiting surface arranged axially and a first abutting surface arranged radially, the end part of the annular wall abuts against the first abutting surface, and an annular groove is arranged on the first limiting surface; the annular wall can deform inwards under the action of external force so as to form limiting parts which are arranged continuously or at intervals, and the limiting parts are embedded in the annular groove.
5. The stationary end structure according to claim 4, wherein a second step adjacent to the first step is provided at an outer end of the stationary end supporting shell, the circular arc section is tightly fitted at the second step, the second step includes a second limiting surface axially provided and a second abutting surface radially provided, an annular step is provided on an inner surface of the annular wall, the annular step is axially clamped with the second abutting surface, and the circular arc section is radially pressed, so that the circular arc section is tightly fitted on the second limiting surface.
6. The dead-end structure of claim 5 wherein the shield is provided with a first inclined surface and a second inclined surface, the first inclined surface being located at the end of the annular wall and facing the first step, the second inclined surface being located on the annular step and facing the second step.
7. The stationary end structure according to claim 1, wherein the cross beam is provided with an assembly hole through which the connecting piece passes, the protective sleeve is U-shaped, a through hole is formed in the protective sleeve, the position of the through hole is matched with that of the assembly hole, the end part of the stationary arc contact is provided with a hollow protruding end, and the protruding end passes through the through hole and is inserted into the assembly hole so as to be fixed on the cross beam through the connecting piece.
8. The stationary end structure of claim 7, wherein said stationary contact is provided with a torus adjacent said protruding end, said torus pressing against said protective sleeve when said connector is connected to said protruding end.
9. The dead-end structure of claim 2 wherein the outer surface of the outer rim is arcuate.
10. A circuit breaker having a dead end structure and a moving end structure, wherein the dead end structure is the dead end structure of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211089820.3A CN116153731B (en) | 2022-09-07 | 2022-09-07 | Static end structure and circuit breaker using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211089820.3A CN116153731B (en) | 2022-09-07 | 2022-09-07 | Static end structure and circuit breaker using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116153731A CN116153731A (en) | 2023-05-23 |
| CN116153731B true CN116153731B (en) | 2023-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211089820.3A Active CN116153731B (en) | 2022-09-07 | 2022-09-07 | Static end structure and circuit breaker using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116153731B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106024436A (en) * | 2016-06-30 | 2016-10-12 | 平高集团有限公司 | Shielding case, touch finger assembly using the same, and circuit breaker |
| CN207572304U (en) * | 2017-12-06 | 2018-07-03 | 广东电网有限责任公司江门供电局 | A kind of fixed contact pedestal of sulfur hexafluoride breaker |
| CN110706966A (en) * | 2019-09-06 | 2020-01-17 | 平高集团有限公司 | Arc contact and circuit breaker |
| CN112735898A (en) * | 2020-12-01 | 2021-04-30 | 平高集团有限公司 | Arc contact and circuit breaker |
-
2022
- 2022-09-07 CN CN202211089820.3A patent/CN116153731B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106024436A (en) * | 2016-06-30 | 2016-10-12 | 平高集团有限公司 | Shielding case, touch finger assembly using the same, and circuit breaker |
| CN207572304U (en) * | 2017-12-06 | 2018-07-03 | 广东电网有限责任公司江门供电局 | A kind of fixed contact pedestal of sulfur hexafluoride breaker |
| CN110706966A (en) * | 2019-09-06 | 2020-01-17 | 平高集团有限公司 | Arc contact and circuit breaker |
| CN112735898A (en) * | 2020-12-01 | 2021-04-30 | 平高集团有限公司 | Arc contact and circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116153731A (en) | 2023-05-23 |
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