Molded case circuit breaker instantaneous protection adjustable mechanism

Abstract

The utility model relates to a molded case circuit breaker instantaneous protection adjustable mechanism, and relates to the technical field of circuit breakers, the molded case circuit breaker instantaneous protection adjustable mechanism comprises a base, an operating mechanism is arranged on the base, one side of the operating mechanism is provided with a draw bar used for driving the operating mechanism to act and executing circuit breaker tripping, and one side of the draw bar far away from the operating mechanism is provided with a tripping trigger mechanism. The tripping triggering mechanism comprises an armature, a tension adjusting mechanism is arranged in the base and comprises an adjusting seat, an adjusting rod is rotationally connected into the adjusting seat, a hanging ring is arranged on the adjusting rod, a connecting ring is arranged at the end, away from the base, of the armature, the position of the connecting ring is higher than the position of the hanging ring, and a tension spring used for adjusting tension is arranged on the adjusting rod. One end of the tension spring is connected with the connecting ring, and the other end is connected with the hanging ring. According to the invention, the tension effect of the tension spring on the armature is improved, and the adjusting effect of instantaneous current is effectively improved.

Description

Technical Field

[0001] This application relates to the field of circuit breaker technology, and in particular to an adjustable mechanism for instantaneous protection of a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers (MCCBs) offer two-stage protection: overload time-delay protection and short-circuit instantaneous protection. They can also be used in conjunction with residual current devices (RCDs), measuring devices, and electrical control modules. In low-voltage power distribution systems, they are commonly used as terminal switches or branch switches, replacing the fuses and knife switches that were previously commonly used.

[0003] Existing molded case circuit breakers have a fixed rated current for instantaneous short-circuit protection, which makes them unable to meet the changing current requirements of electrical loads in actual situations. Furthermore, some existing circuit breakers that can adjust the instantaneous protection current suffer from insufficient tension of the internal spring on the armature at low settings, resulting in insignificant adjustment effects. Summary of the Invention

[0004] The purpose of this application is to provide an adjustable mechanism for instantaneous protection of a molded case circuit breaker, so as to solve the problem that the tension of the spring on the armature is insufficient when the circuit is at its lowest setting, resulting in an insignificant adjustment effect.

[0005] The adjustable mechanism for instantaneous protection of a molded case circuit breaker provided in this application adopts the following technical solution:

[0006] An adjustable mechanism for instantaneous protection of a molded case circuit breaker includes a base, an operating mechanism mounted on the base, a traction rod on one side of the operating mechanism for driving the operating mechanism to trip the circuit breaker, a trip trigger mechanism on the side of the traction rod away from the operating mechanism, the trip trigger mechanism including an armature, a tension adjustment mechanism inside the base, the tension adjustment mechanism including an adjustment seat on one side of the traction rod and an adjustment knob on the adjustment seat, an adjustment rod rotatably connected inside the adjustment seat, a hanging ring on the adjustment rod, a connecting ring on the end of the armature away from the base, the connecting ring being higher than the hanging ring, a tension spring on the adjustment rod for adjusting the armature tension, one end of the tension spring being connected to the connecting ring and the other end of the tension spring being connected to the hanging ring, and the adjustment knob controlling the rotation of the adjustment rod.

[0007] By adopting the above technical solution, there is a height difference between the hanging ring and the connecting ring on the adjusting rod, and the connecting ring is higher than the hanging ring. This causes the tension spring to be in an inclined state after connecting the hanging ring and the connecting ring. At this time, the tension spring is in its limit state due to its own weight. Slightly rotating the adjusting rod can cause the tension spring to deform and stretch.

[0008] Meanwhile, when adjusting via the tension adjustment mechanism, the adjustment rod will rotate toward the base. Due to the inclined setting of the tension spring, the tension distance of the tension spring becomes longer and the deformation speed increases, resulting in a significant tension force on the armature, which effectively improves the adjustment effect of the instantaneous current.

[0009] Optionally, the adjustment knob includes an adjustment part, and an adjustment block is fixedly connected to the side of the adjustment part near the base. The lower end face of the adjustment block is provided with a spiral surface, which extends spirally towards the adjustment part along the edge of the adjustment block.

[0010] By adopting the above technical solution, the adjustment knob is pressed between the lower spiral surface and the adjustment rod, thereby causing the adjustment rod to rotate.

[0011] Optionally, the side of the adjusting block near the base is provided with several arc-shaped grooves, which are arranged along the spiral surface. An adjusting ball is provided on the adjusting rod, which slides along the spiral surface and extends into the arc-shaped groove.

[0012] By adopting the above technical solution, when the adjustment knob is rotated, the adjustment ball slides on the spiral surface of the adjustment block and slides to the arc groove to fix the rotation angle of the adjustment rod. In addition, when the adjustment ball extends into the arc groove, the contact area between the arc groove and the adjustment ball is large, which can effectively prevent accidental contact that could cause the adjustment ball to adjust the setting, resulting in the circuit breaker tripping.

[0013] Optionally, the adjusting rod is provided with a protrusion, and a limit groove is formed in the protrusion, and the adjusting ball rotates in the limit groove.

[0014] By adopting the above technical solution, the ball rotates in the limiting groove, which can minimize the wear between the ball and the adjusting block, and at the same time make it convenient for the user to remove the ball from the arc groove.

[0015] Optionally, the adjustment knob may also include a limiting part, and a locking block is provided on the side of the adjustment seat away from the base. After the adjustment knob is rotated, the limiting part abuts against the locking block.

[0016] By adopting the above technical solution, we can minimize the risk of users turning the adjustment knob in the wrong direction, and at the same time minimize the risk of users turning the adjustment knob excessively, which could damage the circuit breaker.

[0017] Optionally, the length extension direction of the adjusting rod is parallel to the length extension direction of the traction rod.

[0018] By adopting the above technical solution, the positions of the parts on the adjusting rod and the traction rod can be made as corresponding as possible, and the cooperation between the parts on the adjusting rod and the traction rod can be made as convenient as possible.

[0019] Optionally, the tension adjustment mechanism is located on the side wall of the base, and the armature is located between the tension adjustment mechanism and the traction rod.

[0020] By adopting the above technical solution, the tension adjustment mechanism can directly adjust the tension of the armature, avoiding accidental contact with other electrical components inside the circuit breaker when adjusting the armature, which could lead to damage to the circuit breaker.

[0021] In summary, this application includes at least one of the following beneficial technical effects:

[0022] 1. By increasing the tension of the spring on the armature, the instantaneous current regulation effect is effectively improved;

[0023] 2. It is convenient for users to turn the adjustment knob, while effectively preventing accidental touches that could cause the adjustment ball to adjust the setting, leading to circuit breaker tripping. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of this application;

[0025] Figure 2 yes Figure 1 A magnified view of part A in the middle;

[0026] Figure 3 This is an exploded structural diagram of the connection between the adjusting rod and the armature in this application;

[0027] Figure 4 This is a schematic diagram of the connection between the adjusting rod and the adjusting knob in this application;

[0028] Figure 5 This is a cross-sectional structural schematic diagram of the adjustment block in this application;

[0029] Figure descriptions: 1. Base; 2. Operating mechanism; 3. Traction rod; 4. Armature; 401. Connecting ring; 5. Tension adjustment mechanism; 501. Adjusting seat; 502. Adjusting rod; 503. Adjusting knob; 504. Hanging ring; 505. Protrusion; 506. Adjusting ball; 507. Tension spring; 6. Rotating part; 7. Limiting part; 8. Adjusting part; 9. Adjusting block; 10. Arc groove; 11. Limiting groove. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1 -Appendix Figure 5 This application will be described in further detail below.

[0031] An adjustable mechanism for instantaneous protection of a molded case circuit breaker, as described in reference Figure 1 , Figure 2The circuit breaker includes a base 1, an operating mechanism 2 on the base 1, a traction rod 3 on one side of the operating mechanism 2 for driving the operating mechanism 2 to trip the circuit breaker, a trip trigger mechanism on the side of the traction rod 3 away from the operating mechanism 2, the trip trigger mechanism including an armature 4, three armatures 4 arranged along the length of the traction rod 3, a tension adjustment mechanism 5 on the side of the base 1 away from the traction rod 3, the tension adjustment mechanism 5 is located on the side wall of the base 1, the armature 4 is located between the tension adjustment mechanism 5 and the traction rod 3, the tension adjustment mechanism 5 is used to adjust the tripping force required for the armature 4 to touch the traction rod 3, so as to adjust the rated current of the short-circuit instantaneous protection.

[0032] refer to Figure 2 , Figure 3 The tension adjustment mechanism 5 includes an adjustment seat 501 located on one side of the traction rod 3 and away from the operating mechanism 2. An adjustment knob 503 is vertically rotatably connected to the side of the adjustment seat 501 away from the base 1. An adjustment rod 502 is horizontally rotatably connected to the adjustment seat 501. The length direction of the adjustment rod 502 is parallel to the length direction of the traction rod 3. The adjustment rod 502 and the adjustment knob 503 cooperate to adjust the tension of the armature 4. Three hanging rings 504 are fixedly connected along the length direction of the adjustment rod 502. A tension spring 507 is hooked onto each hanging ring 504. A connecting ring 401 is fixedly connected to one end of the armature 4 away from the base 1. The hanging rings 504 correspond to the position of the armature 4. One end of the tension spring 507 is connected to the connecting ring 401, and the other end is connected to the hanging ring 504.

[0033] There is a height difference between the hanging ring 504 and the connecting ring 401 on the adjusting rod 502, and the connecting ring 401 is higher than the hanging ring 504, so that the tension spring 507 between the hanging ring 504 and the connecting ring 401 is tilted and suspended.

[0034] refer to Figure 3 , Figure 4 The adjustment knob 503 includes a rotating part 6, a limiting part 7, and an adjusting part 8. The rotating part 6 is a cylinder with a rotating groove on its upper end surface for easy rotation by the user.

[0035] An annular block is fixedly connected to the limiting part 7, and a locking block is fixedly connected to the side of the adjusting seat 501 away from the base 1. After the limiting part 7 is rotated, the side wall of the annular block abuts against the locking block, which is used to limit the rotation angle of the adjusting knob 503.

[0036] The adjusting part 8 is cylindrical, and an adjusting block 9 is fixedly connected to the side of the adjusting part 8 near the base 1. The lower end surface of the adjusting block 9 is set as a spiral surface, and the spiral surface extends spirally towards the adjusting part 8 along the edge of the adjusting block 9. Five arc-shaped grooves 10 are sequentially opened on the adjusting block 9 along the spiral extension direction.

[0037] A protrusion 505 is fixedly connected to the side of the adjusting rod 502 near the armature 4, and the position of the protrusion 505 corresponds to the position of the adjusting knob 503. An adjusting ball 506 is rotatably connected to the side of the protrusion 505 away from the base 1, and the adjusting ball 506 extends into the corresponding arc groove 10.

[0038] refer to Figure 5 The protrusion 505 is provided with a limiting groove 11. The limiting groove 11 is a concave hemispherical shape and the diameter of the limiting groove 11 on the surface of the protrusion 505 is smaller than the diameter of the adjusting ball 506, so that the adjusting ball 506 can roll freely in the limiting groove 11.

[0039] refer to Figure 3 , Figure 4 Rotating the adjusting knob 503 causes the adjusting ball 506 to roll along the spiral surface, moving it closer to or away from the rotating part, thereby causing the adjusting rod 502 to rotate closer to or away from the rotating part. Furthermore, after the adjusting ball 506 extends into the arc-shaped groove 10 along the spiral surface, the inner wall of the arc-shaped groove 10 fits against the outer wall of the adjusting ball 506, fixing the position of the adjusting ball 506 on the spiral surface, further fixing the rotation amplitude of the adjusting rod 502.

[0040] The specific implementation principle of this application is as follows: the tension adjustment mechanism 5 adjusts the magnitude of the instantaneous protective current that can be passed by adjusting the tension of the armature 4. Furthermore, by having the armature 4 closely attached to the trip trigger mechanism, the force required for the trip trigger mechanism to collide with the traction rod 3 is increased, thereby increasing the rated current that can be passed through the circuit breaker.

[0041] There is a height difference between the hanging ring 504 and the connecting ring 401 on the adjusting rod 502, and the connecting ring 401 is higher than the hanging ring 504. As a result, the tension spring 507 is in an inclined state after connecting the hanging ring 504 and the connecting ring 401. At this time, the tension spring 507 is in its limit state due to its own weight. Slightly rotating the adjusting rod 502 can deform and stretch the tension spring 507.

[0042] Meanwhile, when the tension adjustment mechanism 5 is adjusted, the adjustment rod 502 will rotate towards the base 1. Due to the inclined setting of the tension spring 507, the stretching distance of the tension spring 507 becomes longer and the deformation speed increases, resulting in a significant tension force of the tension spring 507 on the armature 4.

[0043] In addition, when the adjusting knob 503 is turned, the resistance encountered by the adjusting ball 506 when sliding on the adjusting block 9 is small, and the contact surface between the arc groove 10 and the adjusting ball 506 is large when the adjusting ball 506 extends into the arc groove 10, which can effectively prevent accidental contact that causes the adjusting ball 506 to adjust its position, resulting in the circuit breaker tripping.

[0044] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A moulded case circuit breaker instantaneous protection adjustable mechanism, comprising a base (1), an operating mechanism (2) is arranged on the base (1), one side of the operating mechanism (2) is provided with a traction rod (3) for driving the operating mechanism (2) to act and execute the tripping of the circuit breaker, the traction rod (3) is provided with a tripping trigger mechanism away from one side of the operating mechanism (2), the tripping trigger mechanism comprises an armature (4), characterized in that: The base (1) is provided with a tension adjusting mechanism (5), the tension adjusting mechanism (5) includes an adjusting seat (501) arranged on one side of the traction rod (3), an adjusting knob (503) arranged on the adjusting seat (501), the adjusting seat (501) is rotationally connected with an adjusting rod (502), the adjusting rod (502) is provided with a hanging ring (504), the end of the armature (4) away from the base (1) is provided with a connecting ring (401), the position of the connecting ring (401) is higher than the position of the hanging ring (504), the adjusting rod (502) is provided with a tension spring (507) for adjusting the tension of the armature (4), one end of the tension spring (507) is connected with the connecting ring (401), the other end of the tension spring (507) is connected with the hanging ring (504), and the adjusting knob (503) is used for controlling the rotation of the adjusting rod (502).

2. The instantaneous trip unit for a molded case circuit breaker of claim 1, wherein: The adjusting knob (503) comprises an adjusting portion (8), and one side of the adjusting portion (8) close to the base (1) is fixedly connected with an adjusting block (9); the lower end surface of the adjusting block (9) is provided with a spiral surface, and the spiral surface spirally extends along the edge of the adjusting block (9) to the adjusting portion (8).

3. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 2, wherein: A plurality of arc-shaped grooves (10) are formed in the side of the adjusting block (9) close to the base (1), the arc-shaped grooves (10) are arranged along the spiral surface, the adjusting rod (502) is provided with an adjusting ball (506), and the adjusting ball (506) slides along the spiral surface and extends into the arc-shaped groove (10).

4. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 3, wherein: The adjusting rod (502) is provided with a protruding block (505), the protruding block (505) is provided with a limiting groove (11), and the adjusting ball (506) rotates in the limiting groove (11).

5. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 1, wherein: The adjusting knob (503) further comprises a limiting portion (7), and the side, away from the base (1), of the adjusting seat (501) is provided with a clamping block; after the adjusting knob (503) rotates, the limiting portion (7) abuts against the clamping block.

6. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 1, wherein: The length extension direction of the adjusting rod (502) is parallel to the length extension direction of the traction rod (3).

7. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 1, wherein: The hanging ring (504) is arranged along the length direction of the adjusting rod (502), the armature (4) is arranged along the length direction of the traction rod (3), and the hanging ring (504) corresponds to the position of the armature (4).

8. The molded case circuit breaker instantaneous protection adjustment mechanism of claim 1, wherein: The tension adjusting mechanism (5) is arranged on the side wall of the base (1), and the armature (4) is located between the tension adjusting mechanism (5) and the traction rod (3).

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