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CN-122000231-A - High-safety vacuum circuit breaker for power distribution control equipment

CN122000231ACN 122000231 ACN122000231 ACN 122000231ACN-122000231-A

Abstract

The invention relates to the technical field of high-voltage electrical appliance switching equipment, and discloses a high-safety vacuum circuit breaker for power distribution control equipment, which comprises a vacuum circuit breaker body and a movable frame for bearing the vacuum circuit breaker body; the vacuum circuit breaker body comprises a solid-sealed pole body, wherein the solid-sealed pole body is provided with an upper transverse outlet and a lower transverse outlet, a plum blossom contact is arranged at the transverse outlet, a vacuum tank and an inner sealing cylinder positioned below the vacuum tank are packaged in the solid-sealed pole body, an insulating transmission sleeve is arranged in the inner sealing cylinder, and an inner core of an insulating transmission rod is movably arranged in an inner cavity of the insulating transmission sleeve in a penetrating mode. Through setting up wax type temperature sensing package in the conducting arm base, utilize the jump diaphragm as triggering medium, established the direct linkage relation between contact temperature and the mechanical locking, effectively prevented because of the contact fusion welding, the arc or the explosion accident that lead to of forced switching out, promoted the fortune dimension security of distribution equipment.

Inventors

  • Pu Shangzhen

Assignees

  • 无锡恩美特科技有限公司

Dates

Publication Date
20260508
Application Date
20260402

Claims (10)

  1. 1. A high safety vacuum circuit breaker for a power distribution control device, comprising: A vacuum circuit breaker body (1) and a movable carriage (19) carrying the vacuum circuit breaker body (1); the vacuum circuit breaker body (1) comprises a solid-sealed pole main body (2), wherein the solid-sealed pole main body (2) is provided with an upper transverse outlet and a lower transverse outlet, and a plum blossom contact (4) is arranged at the transverse outlet; The inside of the solid-sealed pole main body (2) is sealed with a vacuum tank (5) and an inner sealing cylinder (6) positioned below the vacuum tank (5); An insulating transmission sleeve (15) is arranged in the inner sealing cylinder (6), an insulating transmission rod inner core (12) is movably arranged in the inner cavity of the insulating transmission sleeve (15), and a heat dissipation channel (14) is formed between the inner wall of the insulating transmission sleeve (15) and the outer wall of the insulating transmission rod inner core (12); The solid-sealed pole body (2) is provided with a conductive arm base (3) at the outer part of a transverse outlet corresponding to the plum blossom contact (4), the conductive arm base (3) is positioned at the outer part of the plum blossom contact (4), and a wax type thermal bulb (7) is embedded in the conductive arm base (3); The output end of the wax type temperature sensing bulb (7) is connected with a movable ejector rod (9) which transversely penetrates into the solid sealing pole body (2), and a kick type diaphragm (10) positioned at the tail end of the stroke of the movable ejector rod (9) is arranged in the solid sealing pole body (2).
  2. 2. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 1, wherein when the temperature of the conducting arm base (3) rises, the wax type thermal bulb (7) drives the movable ejector rod (9) to move horizontally to trigger the jump type diaphragm (10), the jump type diaphragm (10) is excited to turn over and slap down the insulating transmission rod inner core (12) to move downwards, so as to drive a locking executing mechanism positioned at the bottom of the solid sealing pole main body (2) to lock the movable frame (19), an annular umbrella skirt (16) distributed at intervals along the axial direction is arranged on the outer wall of the insulating transmission sleeve (15), and a gap is reserved between the outer peripheral surface of the annular umbrella skirt (16) and the inner wall of the inner sealing cylinder (6); Annular reinforcing ribs (13) which are distributed at intervals along the axial direction are arranged on the outer wall of the insulating transmission rod inner core (12), the annular reinforcing ribs (13) are located in the heat dissipation channel (14), the annular umbrella skirt (16) is used for enhancing the insulating performance between the insulating transmission sleeve (15) and the inner sealing cylinder (6), and the annular reinforcing ribs (13) are used for enhancing the rigidity of the insulating transmission rod inner core (12) and changing the airflow form in the heat dissipation channel (14).
  3. 3. The high-safety vacuum circuit breaker for the power distribution control equipment according to claim 2, wherein a limit bump (17) is fixedly connected to the outer side edge of the annular umbrella skirt (16), a step structure matched with the limit bump (17) is arranged on the inner wall of the inner sealing cylinder (6), and the axial movement and circumferential rotation of the insulating transmission sleeve (15) in the inner sealing cylinder (6) are limited through the limit bump (17).
  4. 4. The high-safety vacuum circuit breaker for the power distribution control equipment according to claim 2, wherein the inner wall of the insulating transmission sleeve (15) is provided with internally-protruding turbulence ribs (11), the turbulence ribs (11) and the annular reinforcing ribs (13) on the outer wall of the insulating transmission rod inner core (12) are distributed in a staggered mode on the axial position, and cooling air flow in the cooling channel (14) flows through gaps between the turbulence ribs (11) and the annular reinforcing ribs (13) to form turbulence.
  5. 5. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 1, wherein the conducting arm base (3) is elastically abutted with the transverse outlet end face of the solid-sealed pole main body (2) through a constant-pressure floating disc spring (8) to adapt to thermal expansion and cold contraction and mechanical vibration, and the jump type diaphragm (10) is arranged above the top end of the insulating transmission rod inner core (12) and is positioned in a transition area between the vacuum tank (5) and the inner sealing cylinder (6).
  6. 6. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 2, wherein the locking actuator comprises a bevel pressing block (18) fixedly connected to the bottom end of the insulating transmission rod inner core (12) and a bevel movable block (29) in sliding fit with the bevel pressing block (18), the bevel pressing block (18) is provided with a first vertically downward bevel, the bevel movable block (29) is provided with a second bevel for receiving the first bevel, and the vertical downward movement of the insulating transmission rod inner core (12) is converted into the horizontal linear movement of the bevel movable block (29).
  7. 7. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 6, wherein a movable safety shield (21) is assembled on a panel of the movable frame (19), the movable safety shield (21) is used for shielding an operation hole, a dead lock groove (22) is formed in the surface of the movable safety shield (21), a locking pin (26) is fixed at one end of the inclined plane movable block (29), and when the inclined plane movable block (29) is driven to move forwards horizontally, the locking pin (26) is inserted into the dead lock groove (22) to prevent the movable safety shield (21) from moving.
  8. 8. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 7, further comprising a bracket (23) fixed on the outside of the movable frame (19), wherein a cap ring sleeve (24) is fixed on the bracket (23), the locking pin (26) is penetrated in the cap ring sleeve (24), an axially extending strip-shaped groove (28) is arranged on the surface of the locking pin (26), and a rotation stopping rib (25) embedded in the strip-shaped groove (28) is arranged on the inner wall of the cap ring sleeve (24).
  9. 9. The high-safety vacuum circuit breaker for the power distribution control equipment according to claim 8, wherein a return spring (27) is sleeved outside the locking pin (26), and the return spring (27) is positioned between the cap ring sleeve (24) and the inclined plane movable block (29) and is used for pushing the inclined plane movable block (29) and the inclined plane pressing block (18) to reset after the wax type thermal bulb (7) is cooled and contracted.
  10. 10. The high-safety vacuum circuit breaker for power distribution control equipment according to claim 7, wherein the movable safety shield (21) is of a sliding plate structure, a limiting buckle plate (20) is further arranged on a panel of the movable frame (19), and the limiting buckle plate (20) is used for limiting the sliding range of the movable safety shield (21).

Description

High-safety vacuum circuit breaker for power distribution control equipment Technical Field The invention relates to the technical field of high-voltage electrical appliance switching equipment, in particular to a high-safety vacuum circuit breaker for power distribution control equipment. Background The vacuum circuit breaker is used as core control and protection equipment of a power distribution system, is widely applied to power grids and industrial and mining enterprises, is usually installed in a switch cabinet in cooperation with a chassis vehicle structure, and realizes maintenance or isolation through shaking in and shaking out operation. In the long-term operation process, the contact resistance is easily increased due to spring fatigue, oxidation corrosion or loosening of a fastener at the connecting part of the movable contact and the fixed contact of the circuit breaker, particularly at the plum blossom contact, so that abnormal temperature rise is generated. If the connection part is forced to swing out under the critical state of overheating or even local fusion welding, serious electrical accidents such as arc-drawing short circuit, contact damage or even explosion of a switch cabinet are extremely easy to occur. At present, the monitoring of the contact temperature of the circuit breaker mainly depends on a secondary electron monitoring system, for example, a wireless temperature measuring sensor, an infrared temperature measuring window or an optical fiber temperature measuring device is adopted. However, such active monitoring approaches have inherent limitations that are highly dependent on power supply life, signal transmission stability, and reliability of the background monitoring system, which will not function once the sensor fails or the signal is interrupted. More importantly, the existing temperature measurement system can only send out audible and visual alarm signals generally, an operation path cannot be cut off directly on a mechanical level, when the emergency repair or misjudgment of personnel is faced, the operation personnel are difficult to physically prevent from inserting a handle and forcibly rotating a screw rod mechanism of a chassis, and serious potential safety hazards exist. In addition, the modern vacuum circuit breaker mostly adopts the solid-sealed pole technology, and the vacuum arc-extinguishing chamber and the conductive loop are packaged in epoxy resin to improve the insulating performance and the environmental adaptability. The fully enclosed structure enhances the insulation strength, but also prevents the internal heat from being dissipated, and internal heat accumulation is easy to form. Because the internal space of the solid-sealed pole is narrow and the high-voltage insulation problem is involved, the direct arrangement of the mechanical transmission component in the pole faces great technical challenges, so that the insulation strength is prevented from being damaged, and the heat dissipation and assembly problems of the transmission component are solved, the traditional circuit breaker product is difficult to realize pure mechanical safety linkage by utilizing high-voltage side heat energy to directly drive the low-voltage side locking mechanism while keeping the insulation performance of the pole. Disclosure of Invention In order to overcome the defects in the prior art, the invention provides a high-safety vacuum circuit breaker for power distribution control equipment, and solves the problems in the prior art. The high-safety vacuum circuit breaker for the power distribution control equipment comprises a vacuum circuit breaker body and a movable frame for bearing the vacuum circuit breaker body; The vacuum circuit breaker body comprises a solid-sealed pole main body, wherein the solid-sealed pole main body is provided with an upper transverse outlet and a lower transverse outlet, and plum blossom contacts are arranged at the transverse outlets; The inside of the solid-sealed pole main body is sealed with a vacuum tank and an inner sealing cylinder positioned below the vacuum tank; an insulating transmission sleeve is arranged in the inner sealing cylinder, an inner core of an insulating transmission rod is movably arranged in an inner cavity of the insulating transmission sleeve in a penetrating manner, and a heat dissipation channel is formed between the inner wall of the insulating transmission sleeve and the outer wall of the inner core of the insulating transmission rod; The solid-sealed pole body is provided with a conductive arm base outside the transverse outlet corresponding to the plum blossom contact, the conductive arm base is positioned outside the plum blossom contact, and a wax type thermal bulb is embedded in the conductive arm base; the output end of the wax type temperature sensing bulb is connected with a movable ejector rod which transversely penetrates into the solid-sealed pole main body, and a kick-type diaphragm positione