Electromagnetic tripping device of circuit breaker

Abstract

The present application discloses an electromagnetic tripping device for a circuit breaker, comprising an adjustment mechanism, a linkage mechanism, and an electromagnetic system. The adjustment mechanism is connected to the linkage mechanism, which is connected to the iron core of the electromagnetic system. The adjustment mechanism includes a knob and an adjustment rod. The knob has two adjustment parts, each of which is connected to the adjustment rod. The adjustment rod of the adjustment mechanism is connected to the linkage mechanism. When the knob is rotated, the two adjustment parts of the knob act synchronously and jointly on the adjustment rod, triggering the adjustment rod to move up and down, driving the linkage mechanism to operate, so that the linkage mechanism drives the iron core of the electromagnetic system to move up and down. The electromagnetic tripping device for a circuit breaker of the present invention has a simple structure, ensures that the adjustment rod is evenly stressed, ensures that the tripping current of each phase is consistent, and improves the reliability of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage electrical appliances, and in particular to an electromagnetic tripping device for a circuit breaker. Background Art

[0002] Molded case circuit breakers generally consist of an arc extinguishing system, a contact system, a mechanical operating system, and a thermal-magnetic tripping system. The thermal-magnetic tripping system includes both a thermal system and a magnetic system, corresponding to the overload current protection and short-circuit current protection functions of the molded case circuit breaker.

[0003] The existing direct-acting electromagnetic tripping device is equipped with a knob and an adjustment rod. Turning the knob triggers the adjustment rod to move up and down, driving the linkage mechanism. The linkage mechanism then drives the iron core up and down to adjust the product's tripping current. The adjustment mechanism, linkage mechanism, and electromagnetic system are arranged vertically in sequence. The tripping mechanism is located on one side of the linkage mechanism. The fixed shaft passes through the adjustment rod fixing hole and the bracket fixing hole respectively. The adjustment rod is installed on the bracket and can move up and down along the fixed shaft. Turning the knob can achieve the adjustment rod up and down movement. Turning the knob causes the protrusion of the adjustment rod to rotate along the spiral surface of the knob. The spiral surface gradually presses down the protrusion, causing the adjustment rod to move downward. The adjustment mechanism adjusts the product's tripping current by adjusting the first air gap length and the second air gap length.

[0004] The adjusting rod rotates with the helical surface via the top tip of the conical protrusion, but this structure only has one knob. When the knob is turned, only one point presses down on the adjusting rod, which can easily cause uneven force on the adjusting rod, resulting in an imbalance in horizontal balance. This causes the adjusting rod to tilt and press down on the linkage mechanism, making the lengths of the first and second air gaps in the three-phase core inconsistent. This leads to inconsistent tripping currents across the three phases, which can easily cause malfunction or failure of one phase. Summary of the Invention

[0005] The object of the present invention is to overcome the defects of the prior art and provide an electromagnetic tripping device for a circuit breaker with a simple structure, which makes the adjustment rod evenly stressed, ensures the tripping current of each phase is consistent, and improves the reliability of the circuit breaker.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An electromagnetic tripping device for a circuit breaker includes an adjustment mechanism, multiple linkage mechanisms, and multiple electromagnetic systems. The adjustment mechanism is connected to the multiple linkage mechanisms, which are respectively connected to the iron cores of the multiple electromagnetic systems. The adjustment mechanism includes a knob and an adjustment rod. The knob has two adjustment parts, which are respectively connected to the adjustment rod. The adjustment rod of the adjustment mechanism is connected to the multiple linkage mechanisms. When the knob is turned, the two adjustment parts of the knob synchronously act on the adjustment rod, triggering the adjustment rod to move up and down, driving the linkage mechanism to operate, so that the linkage mechanism drives the iron cores of the electromagnetic systems to move up and down.

[0008] Preferably, the knob includes two rotatable gears, the two gears are meshed and connected, the two adjusting parts are provided on the two gears, a single adjusting part is a spiral structure provided on the bottom surface of a single gear, the adjusting rod is located below the gear, the adjusting rod protrudes upward and is provided with two protrusions corresponding to the spiral structures of the two gears, and the ends of the protrusions abut against the spiral surface of the spiral structure.

[0009] Preferably, the spiral structures of the two gears have the same structure and are arranged in mirror symmetry, and the two protrusions have the same structure and their ends are arranged flush.

[0010] Preferably, the gear is provided with an indicator mark for installation.

[0011] Preferably, the highest and lowest points of the spiral structure are spaced apart, and there is a height difference between the highest point of the spiral structure and the bottom surface of the gear to form a stop step; in the initial state, the end of the protrusion abuts against the bottom surface of the gear and is located between the highest and lowest points of the spiral structure, and the side wall of the protrusion abuts against the stop step of the spiral structure.

[0012] Preferably, it also includes a bracket and a fixed shaft, the gear of the knob can be rotatably mounted on the bracket, the adjusting rod is mounted on the bracket through the fixed shaft, and can move up and down along the fixed shaft, the bracket is provided with a fixing hole fixedly matched with the fixed shaft, and the adjusting rod is provided with a fixed shaft hole slidingly matched with the fixed shaft; during assembly, the end of the fixed shaft is inserted into the fixing hole of the bracket, and the adjusting rod can be slidably mounted on the fixed shaft through the fixed shaft hole thereon.

[0013] Preferably, the knob also includes a mounting portion arranged on the bottom surface of the gear, and each gear can be rotatably mounted on the bracket through the mounting portion thereon. The mounting portion is a cylinder, and an annular groove is provided in the middle of the mounting portion. The bracket is provided with a receiving hole for accommodating the mounting portion of the knob, and the receiving hole has an arc side wall. After assembly, the arc side wall of the bracket extends into the annular groove of the knob, and when the gear rotates, the annular groove rotates along the arc side wall.

[0014] Preferably, there are two fixed shafts, and both ends of the adjusting rod are mounted on the bracket through two fixed shafts. The bracket is provided with two fixing parts for fixing the two fixed shafts; each fixing part includes two fixing sleeves, one above and one below, with a limiting gap between the two fixing sleeves, each fixing sleeve has one fixed hole, and the fixing holes of the two fixing sleeves are aligned, the end of the adjusting rod is sleeved on the fixed shaft and placed in the limiting gap, and the two ends of the fixed shaft are respectively fixed in the fixing holes of the two fixing sleeves.

[0015] Preferably, an adjustment boss for extending out of the housing of the circuit breaker is provided on the top surface of one of the two gears.

[0016] Preferably, the adjustment rod is located above the linkage mechanism, and the adjustment rod protrudes downward and is provided with a plurality of pressure rods that cooperate with the linkage mechanism.

[0017] The electromagnetic tripping device of the circuit breaker of the present invention acts on the adjusting rod synchronously through the two adjusting parts of the knob, so that the adjusting rod is evenly stressed and can move up and down in a horizontal and balanced manner, thereby avoiding the problem of inconsistent lengths of air gaps in the three-phase iron core and inconsistent three-phase tripping currents caused by the tilting of the adjusting rod pressing down the linkage mechanism, effectively avoiding the problem of malfunction or non-operation of a phase caused by such a problem. The structure is simple, the tripping current of each phase is guaranteed to be consistent, and the reliability of the circuit breaker is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the electromagnetic tripping device of the present invention;

[0019] Figure 2 is a perspective view of the adjustment mechanism and linkage mechanism of the present invention;

[0020] Figure 3 is a top view of the adjustment mechanism and linkage mechanism of the present invention;

[0021] Figure 4 is a bottom perspective view of a gear serving as a driving wheel of the present invention;

[0022] Figure 5 is a top perspective view of a gear serving as a driving wheel of the present invention;

[0023] Figure 6 is a bottom perspective view of a gear serving as a driven wheel of the present invention;

[0024] Figure 7 is a top perspective view of a gear serving as a driven wheel of the present invention;

[0025] Figure 8 It is a structural schematic diagram of the adjustment rod of the present invention;

[0026] Figure 9It is a schematic structural diagram of the support of the present invention. DETAILED DESCRIPTION

[0027] The following is combined with Figures 1 to 9 The following embodiments are provided to further illustrate the specific implementation of the electromagnetic tripping device for a circuit breaker of the present invention. The electromagnetic tripping device for a circuit breaker of the present invention is not limited to the description of the following embodiments.

[0028] like Figure 1-3 As shown, the electromagnetic tripping device of the circuit breaker of the present invention includes an adjustment mechanism 1, multiple linkage mechanisms 2, multiple electromagnetic systems 3, and a tripping mechanism 4. The adjustment mechanism 1 is connected to the multiple linkage mechanisms 2, and the multiple linkage mechanisms 2 are respectively connected to the iron cores of the multiple electromagnetic systems 3. The linkage mechanisms 2 are also connected to the tripping mechanism 4. When a tripping current exists in the electromagnetic system 3, the iron core of the electromagnetic system 3 moves to drive the linkage mechanism 2, and the linkage mechanism 2 drives the tripping mechanism 4 to complete the tripping action. In particular, the adjustment mechanism 1 includes a knob 10 and an adjustment rod 11. The knob 10 has two adjustment parts, and the two adjustment parts are respectively connected to the adjustment rod 11. The adjustment rod 11 of the adjustment mechanism 1 is connected to the multiple linkage mechanisms 2. When the knob 10 is turned, the two adjustment parts of the knob 10 act synchronously and jointly on the adjustment rod 11, triggering the adjustment rod 11 to move up and down, driving the linkage mechanism 2 to move, so that the linkage mechanism 2 simultaneously drives the multiple iron cores to move up and down to adjust the tripping current. The electromagnetic tripping device of the circuit breaker of the present invention acts on the adjusting rod synchronously through the two adjusting parts of the knob, so that the adjusting rod is evenly stressed and can move up and down in a horizontal and balanced manner, thereby avoiding the problem of inconsistent lengths of air gaps in the three-phase iron core and inconsistent three-phase tripping currents caused by the adjusting rod tilting and pressing down the linkage mechanism, effectively avoiding the problem of malfunction or non-operation of a phase caused by this, and improving the reliability of the circuit breaker.

[0029] In one embodiment of the present invention, a knob 10 includes a transmission member having two spaced adjustment portions, capable of upward and downward movement. The knob 10 acts on an adjustment rod 11 via the transmission member. Rotating the knob 10 triggers the transmission member to move upward and downward, causing the two adjustment portions to act on the adjustment rod 11. This uniformly forces the adjustment rod 11 upward and downward, driving the multiple linkage mechanisms 2 to operate. This avoids the problem of inconsistent air gap lengths in the three-phase core and inconsistent three-phase tripping currents caused by the tilting of the adjustment rod pressing down on the linkage mechanism. However, this embodiment has the disadvantage of increasing the transmission structure and the height of the electromagnetic trip device's adjustment structure, hindering a compact design.

[0030] like Figure 1-3As shown, in a preferred embodiment of the present invention, the knob 10 includes two rotatable gears 101, wherein the top surface of one of the gears 101 is provided with an adjustment boss 102 that can be manually operated, and the adjustment boss 102 can extend out of the circuit breaker housing for user operation. The two gears 101 are located inside the housing and are invisible to the user. The two gears 101 are meshed and connected, and the two adjustment parts are provided on the two gears 101. The single adjustment part is a spiral structure 103 integrally provided on the bottom surface of the single gear 101. The adjustment rod 11 is located below the gear 101. The adjustment rod 11 protrudes upward and is provided with two protrusions 111 corresponding to the spiral structures 103 of the two gears 101. The ends of the protrusions 111 abut against the spiral surface of the spiral structure 103. The meshing connection of the two gears realizes synchronous rotation, which has a simple structure, improves the synchronization and stability of the rotation of the spiral structure, and thereby improves the smoothness of the up and down movement of the adjustment rod. The adjustment rod 11 is located above the linkage mechanism 2. It protrudes downward and is equipped with a pressure rod 112 that cooperates with the linkage mechanism 2. There are three pressure rods 112, evenly spaced apart. Accordingly, the electromagnetic trip device of the circuit breaker of the present invention has a three-pole electromagnetic system 3, with a single pressure rod 112 acting on a single-pole electromagnetic system 3 through the linkage mechanism 2. Of course, a multi-pole electromagnetic system can also be configured, and the adjustment mechanism 1 of the present invention is equally applicable, by simply adding pressure rods 112 accordingly.

[0031] Specifically, if Figure 1-7 As shown, the spiral structures 103 of the two gears 101 have the same structure and are arranged in mirror symmetry. The two protrusions 111 have the same structure and their ends are arranged flush. The highest and lowest points of the spiral structure 103 are spaced apart, and there is a height difference between the highest point of the spiral structure 103 and the bottom surface of the gear 101, forming a stop step 1030. Figure 2 As shown, in the initial state, the end of the protrusion 111 abuts against the bottom surface of the gear 101 between the highest and lowest points of the spiral structure 103, and the side wall of the protrusion 111 abuts against the stop step 1030 of the spiral structure 103. Since the spiral structures 103 of the two gears 101 are completely mirror-symmetrical, no matter where they are rotated, such as Figure 2 As shown, the contact points where the spiral structures 103 of the two gears 101 abut against the protrusions 111 are at the same height, so that the adjusting rod 11 can be horizontally balanced, and the phase pressure rods 112 on the adjusting rod 11 can act horizontally on the linkage mechanism 2, so that the lengths of the first air gap and the second air gap in the iron cores of each phase of the electromagnetic system are consistent, so that the tripping currents of each phase are consistent.

[0032] In the present invention, two gears 101 are directly meshed and connected to achieve synchronous rotation. One gear 101 has an adjustment boss 102 as a driving wheel, and the other gear 101 serves as its driven wheel. During rotation, the two gears 101 rotate in opposite directions. That is, the spiral structures 103 of the two gears 101 are arranged to be mirror-symmetrical, and the spiral structures 103 of the two gears 101 are arranged in opposite directions from the lowest point to the highest point. Of course, it is also possible to add a driving wheel with an adjustment boss 102, and the two gears 101 serve as driven wheels of the driving wheel, located on either side of the driving wheel. During rotation, the two gears 101 rotate in the same direction. That is, the spiral structures 103 of the two gears 101 are arranged to have the same direction from the lowest point to the highest point.

[0033] In the present invention, the two adjustment parts have the same structure and are arranged in mirror symmetry, and are respectively provided on the two gears 101. Of course, the two adjustment parts can also have different structures, such as two helical structures 103 arranged on the same central axis on the same gear 101. When rotating, the two helical structures 103 rotate in the same direction, that is, the two helical structures 103 are arranged in the same direction from the lowest point to the highest point. For greater stability, the lowest points of the two helical structures 103 can be placed on either side of the central axis of the gear 101. Accordingly, the two protrusions 111 are dispersed on both sides of the central axis of the gear 101.

[0034] For ease of assembly, an indicator mark 105 is provided on the gear 101. The indicator mark 105 is arranged on the top surface of the gear 101. Figure 3 As shown, during assembly, the indicator marks 105 of the two gears 101 are placed on the meshing connection sides of the two gears 101, and the arrows of the indicator marks 105 point towards each other, so that the spiral structures 103 of the two gears 101 become mirror-symmetrical.

[0035] like Figure 1 and Figure 8-9 As shown, the electromagnetic trip device of the circuit breaker of the present invention also includes a bracket 5 and a fixed shaft 6. The gear 101 of the knob 10 is rotatably mounted on the bracket 5. The adjusting rod 11 is mounted on the bracket 5 through the fixed shaft 6 and can move up and down along the fixed shaft 6. The bracket 5 is provided with a fixing hole 52 fixedly matched with the fixed shaft 6, and the adjusting rod 11 is provided with a fixed shaft hole 113 slidingly matched with the fixed shaft 6. During assembly, the end of the fixed shaft 6 is inserted into the fixing hole 52 of the bracket 5, and the adjusting rod 11 is slidably sleeved on the fixed shaft 6 through the fixed shaft hole 113 thereon.

[0036] The knob 10 of the present invention also includes a mounting portion 104 integrally formed on the bottom surface of the gear 101. Each gear 101 is rotatably mounted on the bracket 5 via the mounting portion 104. The mounting portion 104 is cylindrical and has an annular groove 1040 defined in its center. The bracket 5 is provided with a receiving hole 51 for receiving the mounting portion 104 of the knob 10. The receiving hole 51 has an arcuate sidewall 510. After assembly, the arcuate sidewall 510 of the bracket 5 extends into the annular groove 1040 of the knob 10. When the gear 101 rotates, the annular groove 1040 rotates along the arcuate sidewall 510. The spiral structure 103 surrounds the mounting portion 104 and is adhered to the outer wall of the mounting portion 104.

[0037] Specifically, there are two fixed shafts 6, with both ends of the adjustment rod 11 mounted on the bracket 5 via the two fixed shafts 6. The bracket 5 is provided with two fixing portions for securing the two fixed shafts 6. Each fixing portion includes two fixing sleeves 53, one above and one below, with a limiting gap 54 defined between the two fixing sleeves 53. Each fixing sleeve 53 has a fixing hole 52, and the fixing holes 52 of the two fixing sleeves 53 are aligned. The end of the adjustment rod 11 is sleeved onto the fixed shafts 6 and positioned within the limiting gap 54. The ends of the fixed shafts 6 are respectively fixed in the fixing holes 52 of the two fixing sleeves 53. After assembly, the adjustment rod 11 can move up and down along the fixed shafts 6 within the limiting gap 54. The two receiving holes 51 are symmetrically distributed about the perpendicular plane connecting the centers of the two fixing holes 52.

[0038] It should be noted that the specific structures and operational relationships between the adjustment mechanism 1 and the linkage mechanism 2, between the linkage mechanism 2 and the iron core of the electromagnetic system 3, and between the linkage mechanism 2 and the tripping mechanism 4 of the present invention are prior art and will not be repeated here.

[0039] The above is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention should not be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An electromagnetic tripping device for a circuit breaker, comprising an adjusting mechanism (1), a plurality of linkage mechanisms (2) and a plurality of electromagnetic systems (3), wherein the adjusting mechanism (1) is connected to the plurality of linkage mechanisms (2), and the plurality of linkage mechanisms (2) are respectively connected to the iron cores of the plurality of electromagnetic systems (3), characterized in that: The regulating mechanism (1) comprises a knob (10) and an regulating rod (11); the knob (10) has two regulating parts, the two regulating parts are respectively connected to the regulating rod (11); the regulating rod (11) of the regulating mechanism (1) is connected to a plurality of linkage mechanisms (2); when the knob (10) is rotated, the two regulating parts of the knob (10) act on the regulating rod (11) synchronously and jointly, triggering the regulating rod (11) to move up and down, driving the plurality of linkage mechanisms (2) to move, so that the linkage mechanisms (2) drive the iron core of the electromagnetic system (3) to move up and down; the knob (10) comprises at least two rotatable gears (101); the at least two gears (101) are meshed and connected, and the two regulating parts are arranged on the at least two gears (101).

2. The electromagnetic tripping device of a circuit breaker according to claim 1, characterized in that: The knob (10) comprises two rotatable gears (101), the two gears (101) are meshed and connected, the two adjusting parts are arranged on the two gears (101), and a single adjusting part is a spiral structure (103) arranged on the bottom surface of the single gear (101). The adjusting rod (11) is located below the gear (101), and the adjusting rod (11) protrudes upward and is provided with two protrusions (111) corresponding to the spiral structures (103) of the two gears (101), and the ends of the protrusions (111) abut against the spiral surface of the spiral structure (103).

3. The electromagnetic tripping device of the circuit breaker according to claim 2, characterized in that The spiral structures (103) of the two gears (101) have the same structure and are arranged in mirror symmetry. The two protrusions (111) have the same structure and their ends are arranged flush.

4. The electromagnetic tripping device of a circuit breaker according to claim 3, characterized in that: The gear (101) is provided with an indicator mark (105) for installation.

5. The electromagnetic tripping device of the circuit breaker according to claim 3, characterized in that: The highest and lowest points of the spiral structure (103) are spaced apart, and there is a height difference between the highest point of the spiral structure (103) and the bottom surface of the gear (101), thereby forming a stop step (1030); in an initial state, the end of the protrusion (111) abuts against the bottom surface of the gear (101) and is located between the highest and lowest points of the spiral structure (103), and the side wall of the protrusion (111) abuts against the stop step (1030) of the spiral structure (103).

6. The electromagnetic tripping device of a circuit breaker according to claim 2, characterized in that: The invention also comprises a bracket (5) and a fixed shaft (6), wherein the gear (101) of the knob (10) is rotatably mounted on the bracket (5), and the adjusting rod (11) is mounted on the bracket (5) through the fixed shaft (6) and can move up and down along the fixed shaft (6). The bracket (5) is provided with a fixing hole (52) fixedly matched with the fixed shaft (6), and the adjusting rod (11) is provided with a fixing shaft hole (113) slidably matched with the fixed shaft (6); during assembly, the end of the fixing shaft (6) is inserted into the fixing hole (52) of the bracket (5), and the adjusting rod (11) is slidably sleeved on the fixing shaft (6) through the fixing shaft hole (113) thereon.

7. The electromagnetic tripping device of a circuit breaker according to claim 6, characterized in that: The knob (10) further comprises a mounting portion (104) arranged on the bottom surface of the gear (101), and each gear (101) is rotatably mounted on the bracket (5) via the mounting portion (104) thereon. The mounting portion (104) is a cylinder, and an annular groove (1040) is provided in the middle of the mounting portion (104). The bracket (5) is provided with a receiving hole (51) for receiving the mounting portion (104) of the knob (10), and the receiving hole (51) has an arc side wall (510). After assembly, the arc side wall (510) of the bracket (5) extends into the annular groove (1040) of the knob (10), and when the gear (101) rotates, the annular groove (1040) rotates along the arc side wall (510).

8. The electromagnetic tripping device of a circuit breaker according to claim 6, characterized in that: There are two fixed shafts (6), and both ends of the adjusting rod (11) are mounted on the bracket (5) through the two fixed shafts (6). The bracket (5) is provided with two fixing parts for fixing the two fixed shafts (6); each fixing part comprises two fixing sleeves (53) one above and one below, a limiting gap (54) is provided between the two fixing sleeves (53), each fixing sleeve (53) has one fixing hole (52), and the fixing holes (52) of the two fixing sleeves (53) are aligned. The end of the adjusting rod (11) is sleeved on the fixed shaft (6) and placed in the limiting gap (54), and the two ends of the fixed shaft (6) are respectively fixed in the fixing holes (52) of the two fixing sleeves (53).

9. The electromagnetic tripping device of a circuit breaker according to claim 2, characterized in that: An adjusting boss (102) for extending outside the housing of the circuit breaker is provided on the top surface of one of the two gears (101).

10. The electromagnetic tripping device of a circuit breaker according to claim 1, characterized in that: The adjusting rod (11) is located above the linkage mechanism (2), and the adjusting rod (11) protrudes downward and is provided with a plurality of pressure rods (112) that cooperate with the linkage mechanism (2).

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