Lower isolation circuit breaker for environment-friendly cabinet

Abstract

The utility model discloses a lower isolation circuit breaker used for an environmental protection cabinet, comprising a rack, the rack is provided with an operation mechanism, an arc extinguish chamber and a moving contact knife, the upper end of the arc extinguish chamber is connected with the operation mechanism, the lower end of the arc extinguish chamber is connected with a first static contact, the bottom surface of the rack is connected with a second static contact, and the second static contact is connected with a third static contact. The first static contact and the second static contact are respectively arranged on the motion trail of the moving contact knife, an insulating sleeve is coated outside the arc extinguish chamber, a shielding seat is arranged on the insulating sleeve corresponding to the upper end of the arc extinguish chamber, a connecting window matched with flexible connection is arranged on the side wall of the shielding seat, an insulating beam is connected to the side wall of the bottom surface of the rack, and the insulating beam is connected with the arc extinguish chamber. The insulating beam extends towards the operating shaft to form a connecting flange, the movable contact knife is rotatably connected to the connecting flange, the movable contact knife is also in clearance fit with a blocking cover, a blocking cover seat is connected between the adjacent blocking covers, and the blocking cover seat is rotatably connected with the rack. The structure layout is reasonable, the use is reliable, and the use effect is good.

Description

Technical Field

[0001] The utility model relates to a lower isolating circuit breaker used in an environmental protection cabinet. Background Art

[0002] The isolating circuit breaker under the environmental protection cabinet is a key device that integrates the functions of an isolating switch and a circuit breaker, and is installed at the bottom of the environmental protection cabinet. During normal operation, it can accurately control the on and off of the circuit according to the load demand, and realize the power supply management of downstream equipment; during the inspection and maintenance process, it can form a clear disconnection point to safely isolate the live parts from the inspection area and ensure the personal safety of the operation and maintenance personnel. When the circuit suddenly has a short circuit, overcurrent or other faults, the lower isolating circuit breaker can act quickly to cut off the fault current within milliseconds, effectively preventing the spread of the fault. However, the existing structure is inconvenient to use, and the position of the arc extinguishing chamber bracket is not convenient for soft connection and arc extinguishing chamber assembly. Similarly, the position of the lower outlet seat is not conducive to the installation and connection of the busbar due to the structure of the bottom insulating beam, which reduces the assembly efficiency of the structure. At the same time, the bottom insulating beam structure also limits the structural layout. Utility Model Content

[0003] In view of the deficiencies in the prior art, the utility model provides a lower isolating circuit breaker for an environmental protection cabinet, which has a reasonable structural layout, is reliable in use, and has good use effects.

[0004] To achieve the above-mentioned objectives, the utility model provides a lower isolating circuit breaker for an environmental protection cabinet, comprising a frame, the frame being provided with an operating mechanism, an arc extinguishing chamber and a moving contact knife, the upper end of the arc extinguishing chamber being connected to the operating mechanism, the lower end of the arc extinguishing chamber being connected to a first static contact, the bottom surface of the frame being connected to a second static contact, the first static contact and the second static contact being respectively arranged on the movement trajectory of the moving contact knife, the arc extinguishing chamber being covered with an insulating sleeve, a shielding seat being provided on the insulating sleeve corresponding to the upper end of the arc extinguishing chamber, a connecting window for matching a soft connection being provided on the side wall of the shielding seat, an insulating beam being connected to the side wall of the bottom surface of the frame, the insulating beam extending a connecting flange toward the operating shaft, the moving contact knife being rotatably connected to the connecting flange, the moving contact knife also being gap-fitted with a shield, a shield seat being connected between adjacent shields, and the shield seat being rotatably connected to the frame.

[0005] The beneficial effects of this arrangement are as follows: with this arrangement, the connection between the soft connector and the arc extinguishing chamber in the traditional structure is often limited by space, and is prone to wiring redundancy or poor contact problems. However, the connection window has a reserved adapter interface, so that the soft connector can directly pass through the window and accurately connect to the upper end of the arc extinguishing chamber, which not only reduces the bending loss of the wire, but also avoids interference between external lines and other components, significantly improving assembly efficiency and connection stability. Integrating the insulating beam into the side wall of the bottom surface of the frame provides the lower outlet seat with a wider wiring space. Operators can directly fix and test the cables from the side without having to accommodate the bending operation of the traditional bottom layout, which greatly reduces the difficulty of wiring. The combined structure of the shield and the shield seat constructs a three-dimensional insulation barrier for the moving contact knife. The gap-fitted shield adjusts the shielding range synchronously with the movement of the moving contact knife. Adjacent shields form a continuous insulation surface through the shield seat, effectively blocking the air gap discharge path. This dynamic protection design adapts to the full working state of the moving contact knife, avoiding the insulation blind spots that are easily generated by traditional fixed insulation covers at the moving parts. Combined with the overall insulation isolation of the insulating beam, the equipment can still stably meet the insulation requirements in complex environments such as high humidity and high dust.

[0006] As a further configuration of the present invention, a buffer pad is provided on the insulating beam at an edge position corresponding to the connecting flange.

[0007] The beneficial effect of this arrangement is that, at the moment of isolation and closing, the moving contact blade rotates rapidly due to the driving force of the operating shaft, which can easily generate excessive impact due to inertia. In the absence of a buffer device in traditional structures, the moving contact blade may pass over the preset contact position of the static contact, resulting in poor contact or mechanical damage. The buffer pad accurately absorbs the closing impact energy through elastic deformation. When the moving contact blade rotates to the preset position, the edge of the connecting flange contacts the buffer pad, and the damping properties of the buffer material are used to convert kinetic energy into heat energy, effectively limiting the overshoot of the moving contact blade. At the same time, the elastic recovery force of the buffer pad helps the moving contact blade and the static contact form a stable fit, avoiding contact gaps caused by rigid collisions.

[0008] As a further configuration of the present invention, a partition is provided between the shield seats, a clearance groove is provided on the shield seat corresponding to the connection flange position, and the buffer pad is provided corresponding to the clearance groove position.

[0009] The beneficial effect of this arrangement is that the partitions between adjacent shield seats form a longitudinal insulation barrier, effectively separating the moving area of ​​the moving contact blade from the surrounding components, and significantly extending the creepage path between components with different potentials. Compared with the traditional design without partitions, this layout increases the surface discharge distance of the air gap by more than 30%, effectively reducing the risk of flashover in high humidity environments. The clearance groove not only provides installation space for the buffer pad, avoiding structural interference between the buffer pad and the shield seat, but also extends the surface insulation distance through the groove contour. The buffer pad is set corresponding to the clearance groove, so that the insulating material forms a continuous coverage, eliminating the insulation dead corner at the structural connection.

[0010] As a further configuration of the present invention, a plurality of creepage flanges are arranged at intervals on the insulating beam.

[0011] The beneficial effect of this arrangement is that the flanges form a stepped structure along the surface of the insulating beam. When current flows along the surface, it must form a tortuous path around the flanges, significantly extending the actual creepage distance. This design effectively reduces the risk of leakage in dirty or humid environments. In conjunction with partitions, shields, and other structures, it further strengthens the insulation defense and ensures safe operation of the equipment under complex operating conditions.

[0012] As a further configuration of the present invention, an insulating cover is provided on the frame between the first static contact and the second static contact.

[0013] This configuration offers the following benefits: the insulating cover directly blocks the air discharge path between the two static contacts, preventing the risk of phase-to-phase short circuits caused by insufficient spacing. Furthermore, the insulating cover prevents contaminants such as dust and moisture from adhering to the contact surfaces, reducing the risk of surface creepage. Complementing the creepage flange and shield, it further enhances overall insulation redundancy and ensures reliable insulation between contacts at different potentials. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0015] Figure 2 It is a cross-sectional view of an embodiment of the present utility model. DETAILED DESCRIPTION

[0016] The utility model provides an embodiment of a lower isolation circuit breaker for an environmental protection cabinet, such as Figures 1 to 2As shown, it includes a frame 1, on which an operating mechanism 2, an arc extinguishing chamber 3 and a moving contact knife 5 are provided. The upper end of the arc extinguishing chamber 3 is connected to the operating mechanism 2, and the lower end of the arc extinguishing chamber 3 is connected to a first static contact 31. The bottom surface of the frame 1 is connected to a second static contact 11, and the first static contact 31 and the second static contact 11 are respectively arranged on the movement trajectory of the moving contact knife 5. The arc extinguishing chamber 3 is covered with an insulating sleeve 6, and a shielding seat 61 is provided on the insulating sleeve 6 corresponding to the upper end of the arc extinguishing chamber 3. A connecting window 62 for matching soft connection is provided on the side wall of the shielding seat 61, and an insulating beam 4 is connected to the side wall of the bottom surface of the frame 1. The insulating beam 4 extends a connecting flange 41 toward the operating shaft, and the moving contact knife 5 is rotatably connected to the connecting flange 41. The moving contact knife 5 is also gap-fitted with a shield 51, and a shield seat 52 is connected between adjacent shields 51, and the shield seat 52 is rotatably connected to the frame 1. The beneficial effect of such an arrangement is as follows: with such an arrangement, the connection between the soft connection and the arc extinguishing chamber 3 in the traditional structure is often limited by space, and is prone to wiring redundancy or poor contact problems. However, the connection window 62, by reserving an adapter interface, allows the soft connection to directly pass through the window and accurately connect to the upper end of the arc extinguishing chamber 3, which not only reduces the bending loss of the wire, but also avoids interference between the external circuit and other components, significantly improving the assembly efficiency and connection stability. Integrating the insulating beam 4 into the side wall of the bottom surface of the frame 1 provides the lower outlet seat with a wider wiring space. The operator can directly fix and test the cables from the side without having to accommodate the bending operation of the traditional bottom layout, which greatly reduces the difficulty of wiring. The combined structure of the shield 51 and the shield seat 52 constructs a three-dimensional insulation barrier for the moving contact blade 5. The gap-fitting shield 51 adjusts the shielding range synchronously with the movement of the moving contact blade 5, and the adjacent shields 51 form a continuous insulating surface through the shield seat 52, effectively blocking the air gap discharge path. This dynamic protection design adapts to the full working state of the dynamic contact blade 5, avoids the insulation dead corners that are easily generated by the traditional fixed insulation cover 12 at the moving parts, and cooperates with the overall insulation isolation of the insulating beam 4, so that the equipment can still stably meet the insulation requirements in complex environments such as high humidity and dust.

[0017] As a further configuration of this embodiment, a buffer pad 42 is provided on the insulating beam 4 at a position corresponding to the edge of the connecting flange 41. The beneficial effect of this configuration is that, at the moment of isolation and closing, the movable contact blade 5 rotates rapidly under the driving force of the operating shaft, which is prone to excessive impact due to inertia. When the traditional structure lacks a buffer device, the movable contact blade 5 may pass the preset contact position of the static contact, resulting in poor contact or mechanical damage. The buffer pad 42 accurately absorbs the closing impact energy through elastic deformation. When the movable contact blade 5 rotates to the preset position, the edge of the connecting flange 41 contacts the buffer pad 42, and the damping characteristics of the buffer material are used to convert kinetic energy into heat energy for release, effectively limiting the overshoot amplitude of the movable contact blade 5. At the same time, the elastic restoring force of the buffer pad 42 can help the movable contact blade 5 and the static contact form a stable fit, avoiding the contact gap caused by rigid collision.

[0018] As a further arrangement of this embodiment, a partition 53 is provided between the shield seats 52, a clearance groove is provided on the shield seat 52 corresponding to the position of the connecting flange 41, and the buffer pad 42 is arranged corresponding to the position of the clearance groove. The beneficial effect of this arrangement is that the partition 53 between adjacent shield seats 52 forms a longitudinal insulation barrier, which effectively separates the moving area of ​​the dynamic contact blade 5 from the surrounding components, and greatly extends the creepage path between components with different potentials. Compared with the traditional design without a partition 53, this layout increases the surface discharge distance of the air gap by more than 30%, effectively reducing the flashover risk in a high humidity environment. The clearance groove not only provides installation space for the buffer pad 42, avoiding structural interference between the buffer pad 42 and the shield seat 52, but also extends the surface insulation distance through the groove contour. The buffer pad 42 is arranged corresponding to the clearance groove, so that the insulating material forms a continuous coverage, eliminating the insulation dead corner at the structural connection.

[0019] As a further feature of this embodiment, several creepage flanges 43 are spaced apart on the insulating beam 4. This arrangement creates a stepped structure along the surface of the insulating beam 4. Current flowing along the surface must zigzag around the flanges, significantly extending the actual creepage distance. This design effectively mitigates the risk of leakage in contaminated or humid environments. In conjunction with the partitions 53, shield 51, and other structures, it further strengthens the insulation barrier, ensuring safe operation of the equipment under complex operating conditions.

[0020] As a further feature of this embodiment, an insulating cover 12 is provided on the frame 1 between the first static contact 31 and the second static contact 11. This advantageous feature allows the insulating cover 12 to directly block the air discharge path between the two static contacts, preventing the risk of interphase short circuits caused by insufficient spacing. Furthermore, the insulating cover 12 prevents contaminants such as dust and water vapor from adhering to the contact surfaces, reducing the risk of surface creepage. This cover complements the creepage flange 43, the shield 51, and other structures, further enhancing overall insulation redundancy and ensuring insulation reliability between contacts of different potentials.

[0021] The above example is only one preferred specific example of the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A bottom-isolating circuit breaker for an environmental protection cabinet, comprising a frame, an operating mechanism, an arc extinguishing chamber, and a movable contact blade disposed on the frame, the arc extinguishing chamber being connected to the operating mechanism at its upper end, a first static contact being connected to its lower end, and a second static contact being connected to the bottom surface of the frame, the first and second static contacts being respectively disposed on the motion trajectory of the movable contact blade, the arc extinguishing chamber being covered with an insulating sleeve, and characterized in that: A shielding seat is provided on the insulating sleeve corresponding to the upper end of the arc extinguishing chamber, and a connecting window for matching the soft connection is opened on the side wall of the shielding seat. An insulating beam is connected to the side wall of the bottom surface of the frame, and the insulating beam extends a connecting flange toward the operating shaft. The movable contact knife is rotatably connected to the connecting flange, and a shield is also gap-fitted on the movable contact knife. A shield seat is connected between adjacent shields, and the shield seat is rotatably connected to the frame.

2. The lower isolation circuit breaker for an environmental protection cabinet according to claim 1, characterized in that: A buffer pad is provided on the insulating beam at a position corresponding to the edge of the connecting flange.

3. The lower isolation circuit breaker for an environmental protection cabinet according to claim 2, characterized in that: A partition is provided between the shield seats, a clearance groove is provided on the shield seat corresponding to the position of the connecting flange, and the buffer pad is provided corresponding to the position of the clearance groove.

4. The lower isolation circuit breaker for an environmental protection cabinet according to claim 1, characterized in that: A plurality of creepage flanges are arranged at intervals on the insulating beam.

5. The lower isolation circuit breaker for an environmental protection cabinet according to claim 1, characterized in that: An insulating cover is provided on the frame between the first static contact and the second static contact.

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