Tripping mechanism of molded case circuit breaker

Abstract

The utility model discloses a tripping mechanism of a molded case circuit breaker, and relates to the technical field of circuit breakers, the tripping mechanism comprises two lug plates, a conducting strip is mounted between the two lug plates, one end, close to the conducting strip, of one lug plate is fixedly connected with a mounting plate, the mounting plate is provided with a connecting assembly, and the mounting plate is provided with a rotating shaft through the connecting assembly; through cooperative arrangement of the lantern ring, the balls, the fastening sleeve and other structures, during use, the rotating shaft can be pulled out of the supporting plate and the torsional spring can be disassembled and replaced only by rotating the fastening sleeve and taking down the fastening sleeve, and the situation that the torsional spring is difficult to take down from the rotating shaft to be disassembled and replaced is avoided as much as possible; and the applicability is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of circuit breakers, in particular to a tripping mechanism of a molded case circuit breaker. BACKGROUND

[0002] The molded case circuit breaker can automatically cut off the current when the current exceeds the trip setting. The molded case refers to using a plastic insulator as the housing of the device to isolate the conductors and the grounded metal parts. The molded case circuit breaker usually contains a thermal magnetic trip unit, and large-sized molded case circuit breakers are equipped with solid-state trip sensors. The tripping unit is divided into thermal magnetic tripping and electronic tripping.

[0003] The existing tripping mechanism of the molded case circuit breaker mostly sets the torsional spring on the rotating shaft, so that the movable block is away from the conductive sheet. When the circuit is abnormal, magnetic force is generated between the movable block and the conductive sheet, so that the movable block overcomes the elastic force of the torsional spring and contacts the conductive sheet, thereby cutting off the current. However, the torsional spring will be fatigued after long-term use, and it is difficult to remove it from the rotating shaft for disassembly and replacement, thereby reducing the applicability. CONTENT OF THE UTILITY MODEL

[0004] The utility model discloses a tripping mechanism of a molded case circuit breaker, which can overcome the defects of the prior art.

[0005] To achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0006] The tripping mechanism of the molded case circuit breaker comprises two connecting pieces, two conductive sheets are installed between the two connecting pieces, one end of the connecting piece close to the conductive sheet is fixedly connected with a mounting plate, a connecting assembly is arranged on the mounting plate, the mounting plate is installed with a rotating shaft through the connecting assembly, a torsional spring is sleeved on the rotating shaft, the connecting assembly comprises two support plates fixedly connected to the side wall of the mounting plate, the rotating shaft is located between the two support plates and penetrates through the support plates at both ends, a sleeve ring is arranged on the side wall of the two support plates opposite to each other, a plurality of rolling balls are rotatably connected to the side wall of the sleeve ring close to the support plate, and a fastening sleeve is threadedly connected to both ends of the rotating shaft.

[0007] By adopting the above technical scheme, when in use, first, the torsional spring is located between the two support plates, then the rotating shaft is penetrated through the two support plates and the torsional spring to install the torsional spring, then the two sleeves and the fastening sleeve are respectively sleeved on the two ends of the rotating shaft, the fastening sleeve is rotated to make the fastening sleeve close to the support plate, the sleeve is pushed to the support plate, the ball is abutted with the support plate, the rotating shaft is fixed between the two support plates to prevent movement while being rotatable, when the torsional spring is damaged due to fatigue, only the fastening sleeve needs to be rotated and removed to disassemble and replace, thereby avoiding the problem that the torsional spring is difficult to be removed from the rotating shaft for disassembly and replacement, and the applicability is reduced.

[0008] Optionally, the conductive sheet is provided with a movable block, one end of the movable block is fixedly connected with two connecting plates, the ends of the connecting plates away from the movable block are sleeved on the rotating shaft, one end of the movable block between the two connecting plates is fixedly connected with a limiting plate, the torsional spring is abutted with the side wall of the mounting plate at both ends, one end of the torsional spring located above is fixedly connected with a pressing rod, and the end of the limiting plate away from the movable block is located between the pressing rod and the mounting plate.

[0009] By adopting the above technical scheme, the pressing rod is pressed against the limiting plate and abutted with the mounting plate by the elastic force of the torsional spring, and the movable block is away from the conductive sheet, when the circuit is abnormal, the magnetic force is generated between the movable block and the conductive sheet, the movable block is close to the conductive sheet, the elastic force of the torsional spring is overcome, and the movable block is in contact with the conductive sheet, so that the current is cut off.

[0010] Optionally, the upper surfaces of the terminal pieces are fixedly connected with terminal columns, and the top ends of the terminal columns are fixedly connected with limiting discs.

[0011] By adopting the above technical scheme, the cable is connected with the terminal piece through the terminal column, and the cable is prevented from being separated from the terminal column through the limiting disc.

[0012] Optionally, the side walls of the two ends of the rotating shaft are provided with limiting grooves, the inner side walls of the sleeves are fixedly connected with limiting blocks, and the limiting blocks are slidingly arranged in the limiting grooves.

[0013] By adopting the above technical scheme, the sleeves can be prevented from rotating on the rotating shaft through the limiting grooves and the limiting blocks.

[0014] Optionally, the side wall of one end of the fastening sleeve close to the sleeve is fixedly connected with a plurality of annular arrays of fixing blocks, the fixing blocks are provided with holes, and the ends of the fixing blocks away from the sleeve are provided with fixing bolts, the fixing bolts are penetrated through the holes and are in threaded connection with the sleeve.

[0015] By adopting the above technical scheme, after the fastening sleeve is attached to the collar, the fixed bolt is screwed through the hole and the collar, so that when the rotating shaft drives the collar to rotate, the fastening sleeve rotates with the collar, preventing the fastening sleeve from separating from the rotating shaft and causing the rotating shaft to move.

[0016] Optionally, the limiting groove is provided with a positioning rod, one end of the positioning rod is fixedly connected with the side wall of the limiting groove, and the limiting block is sleeved on the positioning rod.

[0017] By adopting the above technical scheme, the stability of the limiting block in the limiting groove can be improved by the positioning rod.

[0018] Optionally, the hole is arc-shaped.

[0019] By adopting the above technical scheme, by the arc-shaped hole, when the fastening sleeve is close to the collar, the hole is aligned with the connecting hole on the collar, the fixed bolt is screwed through the hole and the collar, and errors of the hole and the connecting hole on the collar are avoided, so that the fixed bolt is screwed with the collar.

[0020] Optionally, a rotating ring is embedded in the side wall of the support plate close to the collar, the rotating ring is rotationally connected with the support plate, and one end of the ball away from the collar abuts against the rotating ring.

[0021] By adopting the above technical scheme, when the ball is stuck and cannot rotate, the ball abuts against the support plate, preventing the rotating shaft from rotating.

[0022] In summary, the application has the following beneficial effects:

[0023] 1. The application is provided by cooperation between the collar, the ball and the fastening sleeve, and in use, the torsional spring is first located between the two support plates, then the rotating shaft is penetrated through the two support plates and the torsional spring to install the torsional spring, and then the two collars and the fastening sleeve are sleeved on the two ends of the rotating shaft, the fastening sleeve is rotated to approach the support plate, the collar is pushed to the support plate, the ball abuts against the support plate, the rotating shaft is fixed between the two support plates to prevent movement and rotation, when the torsional spring is damaged due to fatigue, the fastening sleeve is only rotated and removed for replacement, thereby avoiding the problem that the torsional spring is difficult to remove from the rotating shaft for replacement, reducing the applicability.

[0024] 2. After the fastening sleeve is attached to the collar, the fixed bolt is screwed through the hole and the collar, so that when the rotating shaft drives the collar to rotate, the fastening sleeve rotates with the collar, preventing the fastening sleeve from separating from the rotating shaft and causing the rotating shaft to move. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1The whole structure schematic diagram of the utility model is shown in the figure.

[0026] Figure 2 The connecting assembly plane structure schematic diagram of the utility model is shown in the figure.

[0027] Figure 3 The utility model discloses a Figure 2 The A area amplification structure schematic diagram of the utility model is shown in the figure.

[0028] Figure 4 The utility model discloses a

[0029] The connecting assembly plane structure schematic diagram of the utility model is shown in the figure. Specific implementation mode

[0030] The following will be combined with the attached Figures 1-4 Further detailed description will be made to the application.

[0031] Please refer to Figures 1-3 The tripping mechanism of the molded case circuit breaker includes two wiring pieces 1 for being connected with cables, the two wiring pieces 1 are provided with the conductive piece 2, one of the wiring pieces 1 is fixedly connected with the mounting plate 3 close to one end of the conductive piece 2, the mounting plate 3 is provided with the connecting assembly, the mounting plate 3 is provided with the rotating shaft 4 through the connecting assembly, the rotating shaft 4 is provided with the torsional spring 5.

[0032] The connecting assembly includes the support plate 6, the sleeve ring 7, the ball 8 and the fastening sleeve 9, the support plate 6 is provided with two and is fixedly connected on the side wall close to the conductive piece 2 of the mounting plate 3, the two support plates 6 are in the same horizontal plane and are provided with the gap between, the rotating shaft 4 is located between the two support plates 6 and the both ends respectively penetrate the support plate 6, the both ends of the rotating shaft 4 extend to the outside of the support plate 6, the sleeve ring 7 is provided with two and is respectively provided on the both ends of the rotating shaft 4, the ball 8 is provided with two groups, each group is provided with a plurality of, each group of the ball 8 is rotatably connected on the side wall close to the support plate 6 of the sleeve ring 7, the fastening sleeve 9 is provided with two and is respectively screw-connected on the both ends of the rotating shaft 4.

[0033] In use, first, the torsion spring 5 is placed between the two support plates 6, then the rotating shaft 4 is penetrated through the two support plates 6 and the torsion spring 5 to install the torsion spring 5, then the two sleeves 7 and the fastening sleeve 9 are respectively sleeved on the two ends of the rotating shaft 4, the fastening sleeve 9 is rotated to make the fastening sleeve 9 close to the support plate 6, the sleeve 7 is pushed to the support plate 6, the ball 8 is abutted with the support plate 6, the rotating shaft 4 is fixed between the two support plates 6 to prevent movement while rotating, when the torsion spring 5 is damaged due to fatigue, only the fastening sleeve 9 needs to be rotated and removed to disassemble and replace, which can avoid the problem that the torsion spring 5 is difficult to disassemble and replace from the rotating shaft 4, thereby reducing the applicability.

[0034] With reference to Figure 1 And Figure 2 , the movable block 10 for contacting the conductive sheet 2 to cut off the current between the two connecting pieces 1 is arranged above the conductive sheet 2, one end of the movable block 10 is fixedly connected with two connecting plates 11, the ends of the connecting plates 11 away from the movable block 10 are sleeved on the rotating shaft 4, one end of the movable block 10 between the two connecting plates 11 is fixedly connected with a limiting plate 12, the torsion spring 5 is abutted with the side wall of the mounting plate 3 at both ends, one end of the torsion spring 5 above is fixedly connected with a pressing rod 13, the end of the limiting plate 12 away from the movable block 10 is located between the pressing rod 13 and the mounting plate 3, the pressing rod 13 is pressed against the mounting plate 3 by the elastic force of the torsion spring 5, the movable block 10 is away from the conductive sheet 2, when the circuit is abnormal, the magnetic force between the movable block 10 and the conductive sheet 2 makes the movable block 10 close to the conductive sheet 2, overcomes the elastic force of the torsion spring 5 and contacts the conductive sheet 2, thereby cutting off the current.

[0035] With reference to Figure 1 , the connecting piece 1 is fixedly connected with a connecting column 14 on the upper surface, the connecting column 14 is fixedly connected with a limiting disc 15 at the top end, the cable is connected with the connecting piece 1 through the connecting column 14, and the cable is prevented from being separated from the connecting column 14 through the limiting disc 15.

[0036] With reference to Figure 4 , the limiting groove 16 is arranged on the side wall of the rotating shaft 4 at both ends, the limiting block 17 is fixedly connected with the inner side wall of the sleeve 7, and the limiting block 17 is slidingly arranged in the limiting groove 16, the sleeve 7 can be prevented from rotating on the rotating shaft 4 through the limiting groove 16 and the limiting block 17.

[0037] With reference to Figure 4The side wall of the fastening sleeve 9 close to the end of the sleeve ring 7 is fixedly connected with a plurality of annular arrays of fixing blocks 18, the fixing blocks 18 are provided with holes 19, and the end of the fixing blocks 18 away from the sleeve ring 7 is provided with a fixing bolt 20, the fixing bolt 20 penetrates through the hole 19 and is threadedly connected with the sleeve ring 7, after the fastening sleeve 9 is attached to the sleeve ring 7, the fixing bolt 20 is threadedly connected with the sleeve ring 7 through the hole 19, so that when the sleeve ring 7 is rotated by the rotating shaft 4, the fastening sleeve 9 rotates with the sleeve ring 7, preventing the fastening sleeve 9 from being separated from the rotating shaft 4 and causing the rotating shaft 4 to move.

[0038] With reference to Figure 4 The limiting groove 16 is provided with a positioning rod 21, one end of the positioning rod 21 is fixedly connected with the side wall of the limiting groove 16, and the limiting block 17 is sleeved on the positioning rod 21, so that the stability of the limiting block 17 in the limiting groove 16 is improved.

[0039] With reference to Figure 4 The hole 19 is arc-shaped, through the arc-shaped hole 19, when the fastening sleeve 9 is close to the sleeve ring 7, the hole 19 is aligned with the connecting hole on the sleeve ring 7, the fixing bolt 20 is conveniently threadedly connected with the sleeve ring 7 through the hole 19, and the error of the hole 19 and the connecting hole on the sleeve ring 7 is avoided, so that the fixing bolt 20 is threadedly connected with the sleeve ring 7.

[0040] With reference to Figure 3 and Figure 4 The side wall of the support plate 6 close to the sleeve ring 7 is embedded with a rotating ring 22, the rotating ring 22 is rotatably connected with the support plate 6, and one end of the ball 8 away from the sleeve ring 7 abuts against the rotating ring 22, through the rotating ring 22, when the ball 8 is stuck and cannot rotate, the ball 8 abuts against the support plate 6, so that the rotating shaft 4 is difficult to rotate.

[0041] The implementation principle of the present application is as follows: in use, first, the torsional spring 5 is placed between the two support plates 6, then the rotating shaft 4 is penetrated through the two support plates 6 and the torsional spring 5 to install the torsional spring 5, then the two sleeve rings 7 and the fastening sleeve 9 are respectively sleeved on the two ends of the rotating shaft 4, the limiting block 17 is located in the limiting groove 16 to prevent the sleeve ring 7 from rotating on the rotating shaft 4, then the fastening sleeve 9 is moved close to the support plate 6 by rotating the fastening sleeve 9, the sleeve ring 7 is pushed towards the support plate 6, the ball 8 is abutted with the support plate 6, the rotating shaft 4 is fixed between the two support plates 6 to prevent movement while allowing rotation, then the fixing bolt 20 is screwed through the hole 19 and the sleeve ring 7, the nut on the fixing bolt 20 is abutted with the fixing block 18, the rotating shaft 4 can drive the sleeve ring 7 to rotate, the fastening sleeve 9 rotates to prevent the fastening sleeve 9 from being separated from the rotating shaft 4, when the torsional spring 5 is damaged due to fatigue, the fixing bolt 20 is removed, then the fastening sleeve 9 is removed by rotating the fastening sleeve 9, the rotating shaft 4 is extracted, the torsional spring 5 is disassembled and replaced, the problem that the torsional spring 5 is difficult to be removed from the rotating shaft 4 for disassembly and replacement is avoided, the applicability is reduced, and the rotating ring 22 can prevent the ball 8 from being stuck and unable to rotate, the abutment between the ball 8 and the support plate 6 causes the rotating shaft 4 to be difficult to rotate.

[0042] The above is only the preferred embodiment of the present application and is not used to limit the present application, although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacement for some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A tripping mechanism for a molded case circuit breaker, comprising two terminals (1), a conductive plate (2) installed between the two terminals (1), a mounting plate (3) fixedly connected to one end of one of the terminals (1) near the conductive plate (2), a connecting assembly provided on the mounting plate (3), a rotating shaft (4) mounted on the mounting plate (3) via the connecting assembly, and a torsion spring (5) sleeved on the rotating shaft (4), characterized in that: The connecting assembly includes two support plates (6) fixedly connected to one side wall of the mounting plate (3). The rotating shaft (4) is located between the two support plates (6) and its two ends pass through the support plates (6) respectively. Each of the two support plates (6) has a collar (7) on the opposite side wall. The collar (7) is rotatably connected to a plurality of balls (8) on the side wall near the support plate (6). Both ends of the rotating shaft (4) are threadedly connected to fastening sleeves (9).

2. The tripping mechanism of the molded case circuit breaker according to claim 1, characterized in that: A movable block (10) is provided above the conductive sheet (2). Two connecting plates (11) are fixedly connected to one end of the movable block (10). The ends of the connecting plates (11) away from the movable block (10) are all sleeved on the rotating shaft (4). A limiting plate (12) is fixedly connected between the two connecting plates (11) at one end of the movable block (10). Both ends of the torsion spring (5) abut against the side wall of the mounting plate (3). A pressure rod (13) is fixedly connected to the upper end of the torsion spring (5). The end of the limiting plate (12) away from the movable block (10) is located between the pressure rod (13) and the mounting plate (3).

3. The tripping mechanism of the molded case circuit breaker according to claim 2, characterized in that: Each of the connectors (1) has a terminal block (14) fixedly connected to its upper surface, and a limit plate (15) is fixedly connected to the top of the terminal block (14).

4. The tripping mechanism of the molded case circuit breaker according to claim 3, characterized in that: The rotating shaft (4) has limit grooves (16) on both sides of its sidewalls. The inner sidewall of the collar (7) is fixedly connected to a limit block (17), and the limit block (17) is slidably disposed in the limit groove (16).

5. The tripping mechanism of the molded case circuit breaker according to claim 4, characterized in that: The fastening sleeve (9) has a fixed connection of a plurality of ring array fixing blocks (18) on the side wall near the collar (7). The fixing blocks (18) have holes (19) and fixing bolts (20) are provided at the end of the fixing blocks (18) away from the collar (7). The fixing bolts (20) pass through the holes (19) and are threadedly connected to the collar (7).

6. The tripping mechanism of the molded case circuit breaker according to claim 5, characterized in that: The limiting groove (16) is provided with a positioning rod (21), one end of the positioning rod (21) is fixedly connected to the side wall of the limiting groove (16), and the limiting block (17) is sleeved on the positioning rod (21).

7. The tripping mechanism of the molded case circuit breaker according to claim 6, characterized in that: The hole (19) is arc-shaped.

8. The tripping mechanism of the molded case circuit breaker according to claim 7, characterized in that: The support plate (6) has a rotating ring (22) embedded in the side wall near the collar (7). The rotating ring (22) is rotatably connected to the support plate (6). The end of the ball (8) away from the collar (7) abuts against the rotating ring (22).

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