一种热磁式可调断路器

Abstract

本实用新型公开一种热磁式可调断路器，包括壳体、牵引杆、热脱扣调节单元和磁脱扣调节单元，热脱扣调节单元包括延时旋钮、延时调节杆和双金属片，延时调节杆横向滑移于牵引杆后侧，其上端有带多级变厚阶梯面的延时调节块，双金属片受热形变顶推阶梯面驱动牵引杆动作，延时旋钮下端偏心驱动柱驱动延时调节杆横向滑移，切换阶梯面与双金属片顶推头对位；磁脱扣调节单元包括瞬动旋钮、瞬动调节杆、衔铁和扭簧件，衔铁由扭簧件提供预紧力，瞬动旋钮通过周向变高的螺旋抵接面驱动瞬动调节杆转动，改变扭簧件对衔铁预紧力。该断路器采用热脱扣与磁脱扣独立调节结构，布局紧凑、传动配合稳定、操作顺畅，可精准调控过载延时与短路瞬时保护参数。

Claims

1. A thermomagnetic adjustable circuit breaker, comprising a housing (1), a traction rod (2) rotatably mounted inside the housing (1), a thermal trip adjustment unit (3) for adjusting overload delay action, and a magnetic trip adjustment unit (4) for adjusting short-circuit instantaneous action, characterized in that: The thermal trip adjustment unit (3) includes a delay knob (31), a delay adjustment rod (32), and several bimetallic strips (33); The delay adjustment rod (32) includes a sliding rod body (321), several delay adjustment blocks (322) arranged laterally along the upper end of the sliding rod body (321), and a sliding adjustment mating part (323) protruding backward. The sliding rod body (321) is slidably mounted on the rear side of the traction rod (2). Each delay adjustment block (322) has multiple stepped surfaces (3221) arranged laterally on the upper side of the rear side. The thickness of the rear protrusion of each stepped surface (3221) changes step by step. Adjacent stepped surfaces (3221) are connected by a slope. The upper end of the traction rod (2) is provided with a limiting block (21) that abuts against the front side of the delay adjustment block (322). The delay adjustment block (322) can drive the traction rod (2) to rotate by pushing the limiting block (21) forward. Several bimetallic strips (33) are disposed behind the corresponding delay adjustment block (322). The lower end of the bimetallic strip (33) is fixed to the corresponding housing support (5), and the upper end has a deformation push head (331). When the bimetallic strip (33) is heated and deformed, the deformation push head (331) moves forward to approach the corresponding stepped surface (3221). The upper end of the delay knob (31) is exposed on the top surface of the housing (1), and the lower end is provided with an eccentric drive column (311). The eccentric drive column (311) is inserted into the matching groove (3231) on the sliding adjustment fitting part (323). When the delay knob (31) is rotated, the eccentric drive column (311) abuts against the matching groove (3231) of the sliding adjustment fitting part (323) to drive the delay adjustment rod (32) to slide laterally, thereby switching different stepped surfaces (3221) and the deformation push head (331) for alignment. The magnetic trip adjustment unit (4) includes an instantaneous knob (41), an instantaneous adjustment rod (42), several armatures (43) and a torsion spring (44); The armature (43) is rotatably connected to the corresponding housing bracket (5) through a hinge shaft. The lower end of each armature (43) is a spring abutment plate (431), and the upper end extends a transmission cooperation rod (432). The transmission cooperation rod (432) of the armature (43) mounted on the same housing bracket (5) is arranged in parallel with the bimetallic strip (33). The upper end of the traction rod (2) is provided with a limiting top block (22) located in front of the transmission cooperation rod (432). The transmission cooperation rod (432) of the armature (43) pushes the limiting top block (22) forward, which can drive the traction rod (2) to rotate. The instantaneous adjustment rod (42) includes a rotating rod body (421), a plurality of torsion spring pressure blocks (422) arranged laterally along the front side of the rotating rod body (421), and a height adjustment fitting part (423). The rotating rod body (421) is rotatably assembled inside the housing (1) and located behind the armature (43). The torsion spring (44) is sleeved on the hinge shaft. The first torsion spring support (441) at the lower end of the torsion spring (44) abuts against the rear side of the spring body abutment plate (431) of the armature (43), and the second torsion spring support (442) at the upper end abuts against the lower end face of the torsion spring pressure block (422). The upper end of the instantaneous knob (41) is exposed on the top surface of the housing (1), and the lower end is provided with a height driving part (411). The lower end surface of the height driving part (411) has a spiral abutment surface (412). The spiral abutment surface (412) gradually changes in height along the circumference and forms an abutment with the upper end surface of the height adjustment fitting part (423). When the instantaneous knob (41) is rotated, the spiral abutment surface (412) gradually presses down on the height adjustment fitting part (423) along the circumference, driving the instantaneous adjustment rod (42) to rotate, driving the torsion spring pressure block (422) to swing down and compress the second torsion spring support leg (442). When the knob is rotated in the opposite direction, the spiral abutment surface (412) is raised to make room, and the torsion spring member (44) drives the torsion spring pressure block (422) to swing up and reset, thereby adjusting the preload of the torsion spring member (44) on the armature (43).

2. The thermomagnetic adjustable circuit breaker according to claim 1, characterized in that: The housing support (5) includes two opposing support plates (51), the armature (43) is rotatably mounted between the two support plates (51), and each support plate (51) has a hook foot (511) at its upper end; the torsion spring (44) includes a pair of torsion spring rings (443) and a U-shaped first torsion spring foot (441) connecting the lower ends of the pair of torsion spring rings (443), each torsion spring ring (443) has a second torsion spring foot (442) formed at its upper end, and each second torsion spring foot (442) is correspondingly engaged with the hook foot (511), and the rear side of the armature (43) transmission coupling rod (432) abuts against one of the hook feet (511) to achieve a limit; the bimetallic strip (33) is located behind the lower part of the armature (43) and between the two support plates (51).

3. The thermomagnetic adjustable circuit breaker according to claim 1, characterized in that: The spiral contact surface (412) is provided with a plurality of gear slots (413) in the circumferential direction. The upper end face of the height adjustment mating part (423) is provided with a protrusion (4231) that can fit into the gear slot (413). When the instantaneous knob (41) is rotated, the protrusion (4231) is engaged in the corresponding gear slot (413) to achieve gear positioning. The height adjustment mating part (423) extends upward at an angle, and each torsion spring pressure block (422) extends downward at an angle.

4. The thermomagnetic adjustable circuit breaker according to claim 1 or 2 or 3, characterized in that: The housing (1) is provided with a first assembly slot (101) and a second assembly slot (102) in parallel. A first support member (6) and a second support member (7) are vertically inserted into each assembly slot. The upper ends of the two support members are respectively detachably equipped with a first limiting cover (8) and a second limiting cover (9). The first limiting cover (8) and the first support member (6) together form a pivot hole (13), and the second limiting cover (9) and the second support member (7) together form another pivot hole (13). The two pivot holes are coaxially arranged. The instantaneous adjustment rod (42) The rotating rod (421) of the first and second limiting covers is rotatably inserted through the two pivot holes (13); the front ends of the first and second limiting covers are respectively extended with mounting base plates (10); the delay knob (31) is rotatably mounted on the mounting base plate (10) of the first limiting cover (8), and its eccentric drive column (311) extends downward into the clearance space below the mounting base plate (10); the instantaneous knob (41) is rotatably mounted on the mounting base plate (10) of the second limiting cover (9), and its height drive part (411) extends downward into the clearance space below the mounting base plate (10).

5. The thermomagnetic adjustable circuit breaker according to claim 1 or 2 or 3, characterized in that: The upper surfaces of the delay knob (31) and the instantaneous knob (41) are respectively provided with "I" shaped screw holes.

6. The thermomagnetic adjustable circuit breaker according to claim 1 or 2 or 3, characterized in that: The traction rod (2) has a rod body groove (23) and several adjusting block grooves (24) on the rear side of the rod body. The rod body groove (23) is formed by the upper limit wall (231) and the lower limit wall (232) that are spaced apart vertically. The adjusting block groove (24) is formed by the limiting top block (22) and the limiting protrusion (242) that are spaced apart horizontally. The sliding rod (321) is slidably disposed in the rod body groove (23), and each delay adjusting block (322) is slidably disposed in the corresponding adjusting block groove (24). The protrusion (3222) on the front side of the sliding rod (321) is slidably connected to the mating groove (25) on the rear side of the traction rod (2) through the sliding shaft.

7. The thermomagnetic adjustable circuit breaker according to claim 1 or 2 or 3, characterized in that: The bimetallic strip (33) has an adjusting screw (11) threaded onto its deformation push head (331). Rotating the adjusting screw (11) changes the distance between it and the delay adjusting block (322), and the locking nut (12) locks it in place.

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