Thermal adjustable draw bar structure of molded case circuit breaker

Abstract

The invention discloses a thermal adjustable draw bar structure of a molded case circuit breaker, which comprises a knob, a deflector rod, a movable draw plate and a draw bar, and is characterized in that the knob is in gear connection with the deflector rod through a gear, and the knob rotates to drive the deflector rod to rotate horizontally; the traction rod is provided with a baffle, the baffle is provided with a limiting strip-shaped hole, the movable traction plate is attached to the baffle, the rear end of the movable traction plate is provided with a positioning pin connected with the strip-shaped hole, the movable traction plate is fixedly provided with a shifting groove and a contact head, the pin shaft I is in contact connection with the shifting groove in the shifting groove, and the shifting groove is a vertical groove channel; the cross section of the contact head is trapezoidal, the contact head is provided with an inclined surface, and the inclined surface or the top surface is in contact with a thermal tripping screw of a bimetallic strip. Compared with a traditional thermal tripping adjusting device of the molded case circuit breaker, the thermal tripping adjusting device is ingenious and simple in structural design, an old draw bar is arranged to be a movable structure of two assemblies, and by additionally arranging the shifting mechanism, the thermal tripping adjusting device is convenient to operate. Not only is too much limited base space not occupied, but also the contact distance between the bimetallic strip thermal tripping screw and the draw bar can be adjusted, and the thermal tripping time for mounting overload circuits of different specifications can be conveniently adjusted and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of molded case circuit breaker equipment, and in particular to a thermally adjustable traction rod structure of a molded case circuit breaker. Background Art

[0002] There are multiple tripping modes for molded case circuit breakers, including bimetallic thermal tripping, electronic tripping, and electromagnetic tripping. The bimetallic thermal tripping mode utilizes the bending of a bimetallic strip to rotate the drawbar through the bent end. The rotation of the drawbar triggers the re-tripping action, realizing the action of the tripping mechanism to complete the tripping. Its structure includes bimetallic strips in three-phase positions and a rotatable drawbar near the bimetallic strips. The thermal tripping mode is a temperature-sensitive, delayed slow tripping mode. The tripping reaction time is determined by the temperature-sensitive bending time of the bimetallic strip, for example, 20 minutes to complete the tripping. When the molded case circuit breaker is mounted on lines with different power specifications, the tripping reaction time of this delayed tripping mode needs to be adjusted. Because the bimetallic strip material is fixed, there will be matching problems. Therefore, in order to expand the application range of molded case circuit breakers, it is necessary to design a control structure that meets the usage requirements of different specifications. The structure should not be too complex to avoid occupying limited base space, and it should not require too many complex interventions and modifications to the original action mechanism. Summary of the Invention

[0003] The purpose of the present invention is to provide a thermally adjustable drawbar structure for a molded case circuit breaker, which has a simple and ingenious structural design, is easy to operate, and can realize the adjustment and adaptation operation of the thermal trip.

[0004] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is: A thermally adjustable drawbar structure for a molded case circuit breaker includes a knob, a lever, a dynamic drawbar plate, and a drawbar. The drawbar is horizontally arranged at the front end of a bimetallic strip and can be rotated to trigger the tripping action of the molded case circuit breaker. The structure is characterized by: The knob is set on the base on one side of the traction rod and can rotate horizontally. A gear is set at its lower end. The shift lever includes a rotating shaft and a connecting rod. The rotating shaft is hinged to the base and can rotate horizontally. The shift lever gear is fixed to the rotating shaft. One end of the connecting rod is fixedly connected to the rotating shaft, and the other end is fixedly provided with a vertical pin shaft I. The knob is connected to the shift lever gear through the gear. Rotating the knob drives the shift lever to rotate horizontally. The traction rod is provided with a baffle, which is provided with a limited strip hole. The dynamic traction plate is fitted with the baffle, and a positioning pin is provided at its rear end to connect with the strip hole. The positioning pin can slide left and right in the strip hole, that is, the dynamic traction plate can be slidably connected with the baffle; The dynamic traction plate is fixedly provided with a toggle groove and a contact head. The pin shaft I is in contact with the toggle groove in the toggle groove. The toggle groove is a vertical groove. The cross-section of the contact head is trapezoidal and is provided with an inclined surface. The inclined surface or the top surface contacts the thermal release screw of the bimetallic strip.

[0005] Furthermore, the knob is arranged on the upper end shell of the electromagnetic release, and the shell is provided with a mounting hole, and the lower end of the knob can be inserted into the mounting hole. The upper end of the base is provided with a face cover, and the face cover is provided with a limiting hole. The upper end of the knob can pass through the limiting hole. A circle of retaining edge is provided in the middle of the knob, and the knob can be limited by the mounting hole and the limiting hole of the face cover.

[0006] Furthermore, the upper end housing of the electromagnetic release is also provided with an adjusting gear, which is meshed and connected with the knob gear and the lever gear respectively.

[0007] Furthermore, the toggle groove opens toward the toggle rod, and its cross-section is U-shaped, open at the top and bottom, and its groove width is slightly larger than the diameter of the pin shaft I. The toggle groove will flip with the traction plate and traction rod. The design of the vertical U-shaped groove will not affect the connection between the toggle groove and the pin shaft I when flipping, and can ensure that the toggle rod can smoothly toggle the position of the traction plate on the traction rod.

[0008] The lower end of the bimetallic strip is fixed to the conductive connecting plate. When the conductive connecting plate is overheated, the bimetallic strip will be triggered to bend. The upper end of the bimetallic strip is provided with a thermal release screw facing the dynamic traction plate to contact the contact head of the dynamic traction plate.

[0009] The working process of the present invention is as follows: the knob is driven to rotate by a tool, the knob drives the dial rod to rotate, and the dial rod drives the dynamic traction plate provided with a dial groove to move left and right on the traction rod through the pin shaft I, thereby adjusting the relative position of the contact head on the dynamic traction plate and the thermal release screw of the bimetallic strip. When the dynamic traction plate is displaced to the left position, the thermal release screw is actuated and contacts the right end of the inclined surface. At this time, the thermal release distance is the largest and the delayed trigger time is the longest. When the dynamic traction plate is adjusted to the right position, the thermal release screw is actuated and contacts the top surface of the contact head. At this time, when the thermal release screw is not actuated, it is closest to the contact head and the delayed trigger time is the shortest.

[0010] The beneficial effects of the present invention are as follows: compared with the thermal trip adjustment device of the traditional molded case circuit breaker, the structural design of this case is ingenious and simple. The old traction rod is set as a movable structure of two components. By adding a toggle mechanism, it will not take up too much limited base space, and can adjust the contact distance between the bimetallic thermal trip screw and the traction rod, which is convenient for regulating the thermal trip time of overload circuits of different specifications. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 Schematic diagram of the structure of an embodiment of the present invention.

[0012] Figure 2 This is a schematic diagram of the connection of the action components of an embodiment of the present invention.

[0013] Figure 3 This is a schematic diagram of the assembly of the drawbar according to an embodiment of the present invention.

[0014] Figure 4 This is a schematic structural diagram of a dynamic traction plate according to an embodiment of the present invention.

[0015] 1-base, 2-housing, 3-traction rod, 4-knob, 5-shift lever, 6-bimetallic strip, 7-thermal release screw, 8-dynamic traction plate, 9-pin shaft I, 10-baffle, 11-bar hole, 12-locating pin, 13-shift groove, 14-contact head, 15-inclined surface, 16-stop edge, 17-adjusting gear, 18-shift lever gear, 19-connecting rod, 20-trigger plate. DETAILED DESCRIPTION

[0016] The following will be combined with the Figure 1 To the attached Figure 4 , clearly and completely describe the technical solution of the present invention.

[0017] A thermally adjustable drawbar 3 structure for a molded case circuit breaker includes a knob 4, a lever 5, a dynamic drawbar plate 8, and a drawbar 3. The drawbar 3 is horizontally disposed at the front end of a bimetallic strip 6 and can be rotated to trigger the tripping action of the molded case circuit breaker. The knob 4 is disposed on a base 1 on one side of the drawbar 3 and can rotate horizontally. A gear is disposed at its lower end. The drawbar 5 includes a rotating shaft and a connecting rod 19. The rotating shaft is hinged to the base 1 and can rotate horizontally. A drawbar gear 18 is fixedly disposed on the rotating shaft. One end of the connecting rod 19 is fixedly connected to the rotating shaft, and a vertical pin Ⅰ9 is fixedly disposed at the other end. The knob 4 is connected to the drawbar gear 18 via a gear. Rotation of the knob 4 drives the drawbar 5 to rotate horizontally. The traction rod 3 is provided with a baffle 10, and the baffle 10 is provided with a limited strip hole 11. The dynamic traction plate 8 is fitted with the baffle 10, and a positioning pin 12 is provided at its rear end to connect with the strip hole 11. The positioning pin can slide left and right in the strip hole 11, that is, the dynamic traction plate 8 can be slidably connected with the baffle 10; The dynamic traction plate 8 is fixedly provided with a toggle groove 13 and a contact head 14. The pin shaft I9 is ​​in contact with the toggle groove 13 in the toggle groove 13. The toggle groove 13 is a vertical groove. The cross-section of the contact head 14 is trapezoidal and is provided with an inclined surface 15. The inclined surface 15 or the top surface is in contact with the thermal release screw 7 of the bimetallic strip 6.

[0018] Furthermore, the knob 4 is arranged on the upper end shell 2 of the electromagnetic release, and the shell is provided with a mounting hole, and the lower end of the knob 4 can be inserted into the mounting hole. The upper end of the base 1 is provided with a face cover, and the face cover is provided with a limiting hole. The upper end of the knob 4 can pass through the limiting hole, and a circle of retaining edge 16 is provided in the middle of the knob 4. The knob 4 can be limited by the mounting hole and the face cover limiting hole.

[0019] Furthermore, the upper housing of the electromagnetic release is further provided with an adjusting gear 17 , which is meshed and connected with the gear of the knob 4 and the gear of the shift lever 18 .

[0020] Furthermore, the toggle groove 13 opens toward the toggle rod 5, and its cross-section is U-shaped, open at the top and bottom, and its groove width is slightly larger than the diameter of the pin shaft Ⅰ9. The toggle groove 13 will flip with the traction plate 8 and the traction rod 3. The design of the vertical U-shaped groove will not affect the connection between the toggle groove 13 and the pin shaft Ⅰ9 when flipping, and can ensure that the toggle rod 5 can smoothly toggle the position of the traction plate 8 on the traction rod.

[0021] The lower end of the bimetallic strip 6 is fixed to the conductive connecting plate. When the conductive connecting plate is overheated, the bimetallic strip 6 is triggered to bend. The upper end is provided with a thermal release screw 7 facing the dynamic traction plate 8 to contact the contact head 14 of the dynamic traction plate 8.

[0022] A trigger plate 20 is fixedly provided on the upper end of one side of the traction rod, and a manual button is provided on the surface cover. The lower end of the manual button can press the trigger plate 20 to realize manual test tripping and trigger tripping.

[0023] The working process of the present invention is as follows: the knob 4 is driven to rotate by a tool, the knob 4 drives the lever 5 to rotate, and the lever 5 drives the dynamic traction plate 8 provided with the toggle slot 13 to move left and right on the traction rod through the pin shaft Ⅰ9, thereby adjusting the relative position of the contact head 14 on the dynamic traction plate 8 and the thermal trip screw of the bimetallic strip 6. When the dynamic traction plate 8 is displaced to the left position, the thermal trip screw contacts the right end of the inclined surface 15 after actuation. At this time, the thermal trip distance is the largest and the delayed trigger time is the longest. When the dynamic traction plate 8 is adjusted to the right position, the thermal trip screw contacts the top surface of the contact head 14 after actuation. At this time, when the thermal trip screw is not actuated, it is closest to the contact head 14 and the delayed trigger time is the shortest.

[0024] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in the technical field, several improvements can be made without departing from the principles of the present invention. These improvements should also be regarded as the scope of protection of the present invention without paying creative labor.

Claims

1. A thermally adjustable drawbar structure for a molded case circuit breaker, comprising a knob, a lever, a dynamic drawbar plate, and a drawbar. The drawbar is horizontally disposed at the front end of a bimetallic strip and can be rotated to trigger the molded case circuit breaker tripping action. The structure is characterized by: The knob is set on the base on one side of the traction rod and can rotate horizontally. A gear is set at its lower end. The shift lever includes a rotating shaft and a connecting rod. The rotating shaft is hinged to the base and can rotate horizontally. The shift lever gear is fixed to the rotating shaft. One end of the connecting rod is fixedly connected to the rotating shaft, and the other end is fixedly provided with a vertical pin shaft I. The knob is connected to the shift lever gear through the gear. Rotating the knob drives the shift lever to rotate horizontally. The traction rod is provided with a baffle, which is provided with a limited strip hole. The dynamic traction plate is fitted with the baffle, and a positioning pin is provided at its rear end to connect with the strip hole. The positioning pin can slide left and right in the strip hole, that is, the dynamic traction plate can be slidably connected with the baffle; The dynamic traction plate is fixedly provided with a toggle groove and a contact head. The pin shaft I is in contact with the toggle groove in the toggle groove. The toggle groove is a vertical groove. The cross-section of the contact head is trapezoidal and is provided with an inclined surface. The inclined surface or the top surface contacts the thermal release screw of the bimetallic strip.

2. The thermally adjustable drawbar structure of a molded case circuit breaker according to claim 1, characterized in that: The knob is set on the upper end shell of the electromagnetic release. The shell is provided with a mounting hole. The lower end of the knob can be inserted into the mounting hole. The upper end of the base is provided with a cover. The cover is provided with a limiting hole. The upper end of the knob can pass through the limiting hole. A circle of retaining edge is provided in the middle of the knob. The knob can be limited by the mounting hole and the limiting hole of the cover.

3. The thermally adjustable drawbar structure of a molded case circuit breaker according to claim 1, characterized in that: The upper end housing of the electromagnetic release is also provided with an adjusting gear, which is meshed and connected with the knob gear and the shift lever gear respectively.

4. The thermally adjustable drawbar structure of a molded case circuit breaker according to claim 1, characterized in that: The opening of the toggle slot faces the toggle rod, and its cross section is U-shaped, with openings at the top and bottom, and the slot width is slightly larger than the diameter of the pin shaft I.

5. The thermally adjustable drawbar structure of a molded case circuit breaker according to claim 1, characterized in that: The lower end of the bimetallic strip is fixed to the conductive connecting plate. When the conductive connecting plate is overheated, the bimetallic strip will be triggered to bend. The upper end of the bimetallic strip is provided with a thermal release screw facing the dynamic traction plate to contact the contact head of the dynamic traction plate.

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