Electric leakage tripping mechanism and miniature circuit breaker

Abstract

The utility model discloses an electric leakage tripping mechanism and a miniature circuit breaker. The device comprises a handle; a linkage rod; the lock catch is matched with the linkage rod to form a locking position, and the locking position can form an opening when the lock catch rotates relative to the linkage rod; one end of the U-shaped connecting rod is arranged in the locking position, and the other end of the U-shaped connecting rod is linked with the handle; the electric leakage release is arranged in the shell; the tripping rod is rotatably arranged in the shell and is in linkage fit with the electric leakage tripper; the reset piece is fixedly arranged on the tripping rod, one end of the reset piece extends to the moving path of the linkage rod, and the tripping rod comprises a rotating part which is in rotating fit with the shell; the first linkage part extends downwards from the rotating part and is arranged at the front end of an ejector rod of the electric leakage release; and the second linkage part extends from the rotating part to one side of the linkage rod, is positioned on the upper side of the first linkage part and is used for forming linkage fit with the lock catch. The structure of the electric leakage tripping mechanism is optimized, so that the electric leakage tripper directly triggers the lock catch through the tripping rod to complete the tripping action, the number of parts is reduced, the occupied space of the electric leakage tripping mechanism is reduced, and meanwhile, the electric leakage protection reliability of the electric leakage tripping mechanism is higher.

Description

Technical Field

[0001] The utility model specifically relates to a leakage tripping mechanism and a small circuit breaker. Background Art

[0002] Currently, miniature circuit breakers, also known as miniature circuit breakers, are suitable for overload and short-circuit protection of AC 50 / 60Hz circuits with a rated voltage of 230 / 400V and a rated current not exceeding 125A. They can also be used for infrequent line switching under normal circumstances. Miniature circuit breakers are primarily used in various locations, including industrial, commercial, high-rise, and residential buildings. A miniature leakage circuit breaker is a switch that automatically activates when the leakage current in a circuit exceeds a predetermined value, protecting people and electrical appliances. A miniature leakage circuit breaker consists of multiple L-line circuit breaker units and an N-line leakage protection module assembled with these units. The N-line leakage protection module of existing miniature leakage circuit breakers has a complex structural design, and the tripping force of the trip rod is unstable, resulting in unreliable tripping performance and insensitive leakage tripping. Utility Model Content

[0003] In view of the deficiencies in the prior art, the present invention aims to provide a leakage tripping mechanism and a miniature circuit breaker.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A leakage tripping mechanism, comprising:

[0006] A handle rotatably disposed within the housing;

[0007] A linkage rod rotatably disposed within the housing;

[0008] A lock buckle rotatably provided on the linkage rod, wherein the lock buckle cooperates with the linkage rod to form a locked position, and the locked position can form an opening when the lock buckle rotates relative to the linkage rod;

[0009] A U-shaped connecting rod, one end of which is located in the locking position and the other end of which is linked to the handle;

[0010] A leakage release device is arranged in the housing;

[0011] A tripping rod is rotatably arranged in the housing and is linked with the leakage release;

[0012] A reset member is fixedly arranged on the tripping rod, and one end of the reset member extends to the moving path of the linkage rod.

[0013] The trip rod comprises:

[0014] A rotating portion, rotatingly engaged with the housing;

[0015] A first linkage portion extends downward from the rotating portion and is disposed at the front end of the top rod of the leakage release;

[0016] The second linkage portion extends from the rotating portion to one side of the linkage rod and is located on the upper side of the first linkage portion, and is used to form a linkage cooperation with the lock buckle.

[0017] A shielding cover is provided on the outer side of the leakage release.

[0018] The rotating part has a positioning hole, and a positioning shaft matched with the positioning hole is provided in the shell. The positioning shaft is inserted into the positioning hole and constitutes a rotational connection between the tripping rod and the positioning shaft.

[0019] The first linkage portion extends along the outer contour of the leakage release, and a mating surface is provided at the mating position between the first linkage portion and the top rod of the leakage release.

[0020] The reset element is a reset torsion spring.

[0021] A first limit seat is provided between the first linkage part and the second linkage part, a positioning protrusion is provided on the first linkage part near the rotating part, and a second limit seat is provided on the upper side of the positioning protrusion. The reset torsion spring is sleeved outside the positioning protrusion, one end of which is limited by the second limit seat, and the other end of which is limited in its extension direction by the first limit seat, so that it extends to the moving path of the linkage rod.

[0022] One end of the linkage rod is provided with a protrusion for forming linkage cooperation with the reset member.

[0023] The leakage tripping mechanism is also provided with a leakage indicating component.

[0024] The leakage indication component comprises:

[0025] A leakage lock buckle rotatably arranged in the housing;

[0026] A leakage indicator rotatably arranged in the housing,

[0027] The leakage lock is overlapped with the leakage indicator and limits the rotation of the leakage indicator. The trip rod extends upward to form a linkage rod that cooperates with the leakage lock, and the leakage indicator cooperates with the lock.

[0028] A small circuit breaker comprises a shell, wherein the above-mentioned leakage tripping mechanism is arranged in the shell.

[0029] The beneficial effects of the utility model are as follows: the structure of the leakage tripping mechanism is optimized, so that the leakage tripper triggers the lock directly through the tripping rod to complete the tripping action, the number of parts is reduced, the occupied space is reduced, and the reliability of the leakage protection is higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a structural schematic diagram of the leakage tripping mechanism disclosed in the present utility model located inside a housing.

[0031] Figure 2 This is a front view of the leakage tripping mechanism disclosed in the utility model.

[0032] Figure 3 This is a front view of the leakage tripping mechanism disclosed in the present utility model from another direction.

[0033] Figure 4 This is a schematic diagram of the cooperation between the linkage rod and the lock buckle disclosed in the present utility model.

[0034] Figure 5 This is a schematic diagram of the cooperation between the leakage indicator and the leakage lock disclosed in the utility model.

[0035] Figure 6 This is a structural schematic diagram of the trip rod disclosed in the utility model. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] like Figure 1 As shown, the utility model provides a leakage tripping mechanism, which is mainly used in a circuit breaker to achieve leakage tripping protection, and is generally installed in the N-pole chamber of the circuit breaker.

[0039] The leakage trip mechanism includes a handle, a linkage rod, a lock, a U-shaped pull rod, a leakage trip device, and a trip rod. The linkage rod and the lock cooperate with each other to achieve linkage with the handle. Both are preferably located in the L-pole chamber, and both are partially located in the N-pole chamber, forming a linkage with the trip rod located in the N-pole chamber. That is, the lock partially enters the N-pole chamber to form a linkage portion 910, which can be a columnar body arranged perpendicular to the lock.

[0040] The handle 200 rotatably arranged in the housing 100 is used for manual operation, driving the linkage rod and the lock to move synchronously and realize manual opening and closing operations.

[0041] The linkage rod 800 is rotatably arranged in the shell 100. The upper end of the linkage rod is provided with a transverse L-shaped groove at the position where the lock is matched. The L-shaped groove is composed of a transverse groove 820 for releasing the restriction on the U-shaped linkage rod and a vertical groove 830 that forms a restriction with the U-shaped linkage rod.

[0042] The lock buckle 900 is rotatably arranged on the linkage rod 800, and the lock buckle 900 cooperates with the linkage rod 800 to form a locking position 1000, and the locking position 1000 can form an opening when the lock buckle 900 rotates relative to the linkage rod 800. The locking position is achieved by the cooperation of the hook head 920 at the upper end of the lock buckle and the vertical groove. The two cooperate to limit the U-shaped connecting rod to the locking position, so that the handle drives the linkage rod and the lock buckle to move synchronously. When disengaging, the lock buckle is rotated relative to the linkage rod, so that the U-shaped connecting rod is disengaged from the locking position, releasing the restriction on the linkage rod, and completing the disengaging action.

[0043] One end of the U-shaped connecting rod 700 is set in the locking position 1000, and the other end thereof is linked to the handle 200.

[0044] The leakage release 300 arranged in the housing 100 is fixed in a specific groove in the housing, and a shielding cover is provided on the surface thereof, which plays a role in shielding interference signals, thereby facilitating the working reliability of the leakage protection module of the circuit breaker.

[0045] The trip rod 400 is rotatably arranged in the housing 100 and cooperates with the leakage release 300. That is, the action of the leakage release can drive the trip rod to move, resulting in a tripping action. When it moves, it can drive the lock to rotate relative to the linkage rod, so that an opening appears in the locking position 1000, and the U-shaped connecting rod disengages from the opening.

[0046] The reset member 410 is fixedly mounted on the trip rod 400, and one end of the reset member extends to the moving path of the linkage rod 800. In this embodiment, the reset member adopts a reset torsion spring, which is fixed to the trip rod. One end of the reset spring serves as a structure for the linkage rod to cooperate when the linkage rod is in operation. When the circuit breaker is closed, the linkage rod rotates relative to the circuit breaker and contacts one end of the reset torsion spring, thereby driving the entire trip rod to rotate and complete the reset of the trip rod. Compared with the previous method of directly using the torsion of the reset torsion spring to achieve the self-reset of the trip rod, the reset torsion spring is directly used as the member driven to reset. Its structure is simpler, and it relies on the linkage rod to drive the reset, which is more reliable. In other embodiments, a structure integrally formed on the trip rod can also be used as the reset end, that is, the present application uses the movement of the linkage rod when the circuit breaker is closed to drive the trip rod to reset.

[0047] The trip lever 400 comprises an integrally formed rotating portion, a first linkage portion, and a second linkage portion. The first linkage portion is positioned behind the second linkage portion in its direction of movement. The residual current release then drives the second linkage portion, which in turn drives the second linkage portion, thereby triggering the latch. In some embodiments, the first and second linkage portions can be integrally formed, with the first linkage portion's upper end widened to increase displacement, thereby driving the latch.

[0048] The rotating part 420 forms a rotational fit with the shell 100. The rotating part 420 has a positioning hole. A positioning shaft 110 that matches the positioning hole is provided in the shell 100. The positioning shaft 110 is inserted into the positioning hole and forms a rotational connection fit between the trip rod 400 and the positioning shaft 110.

[0049] The first linkage portion 430 extends downward from the rotating portion 420 and is positioned at the front end of the top rod of the leakage current release 300. The first linkage portion 430 extends along the outer contour of the leakage current release 300. A mating surface 490 is provided where the first linkage portion 430 mates with the top rod of the leakage current release 300. The thickness of this mating surface is greater than that of other portions of the first linkage portion, making its mating with the leakage current release more reliable. The elongated design of the first linkage portion allows it to be subjected to a relatively small force and a relatively small change in stroke, thereby triggering the second linkage portion to lock.

[0050] The second linkage part 440 extends from the rotating part 420 to the side of the linkage rod 800, and is located on the upper side of the first linkage part 430, and is used to form a linkage with the lock 900, that is, when the rotating part rotates relatively, it will drive the lock to move, and then make the lock rotate relative to the linkage rod to complete the tripping action.

[0051] A first limiting seat 470 is provided between the first linkage part 430 and the second linkage part 440. A positioning protrusion 460 is provided on the first linkage part 430 near the rotating part 420. A second limiting seat 480 is provided on the upper side of the positioning protrusion 460. The reset torsion spring is sleeved outside the positioning protrusion 460, one end of which is limited by the second limiting seat 480, and the other end of which is limited in its extension direction by the first limiting seat 470, so that it extends to the moving path of the linkage rod 800.

[0052] The first limiting seat and the second limiting seat are mainly used for positioning the reset torsion spring so that it can form a linkage with the linkage rod.

[0053] One end of the linkage rod 800 is provided with a protrusion 810 for forming a linkage cooperation with the reset member 410. By providing the protrusion, the linkage rod can better contact with the reset torsion spring and drive the trip rod to move.

[0054] The leakage tripping mechanism is further provided with a leakage indication component, which is used for switching the leakage indication state.

[0055] The leakage indication component comprises:

[0056] A leakage lock 500 rotatably disposed in the housing;

[0057] The leakage indicator 600 is rotatably arranged in the housing.

[0058] The leakage lock 500 overlaps with the leakage indicator 600 and limits the rotation of the leakage indicator 600. The trip rod extends upward to form a linkage rod 450 that cooperates with the leakage lock 500. The leakage indicator 600 cooperates with the lock.

[0059] That is, under normal conditions, the leakage lock restricts the movement of the leakage indicator. When the leakage release is activated, the trip rod rotates relatively, the linkage rod drives the leakage lock to move, and releases the restriction on the leakage indicator. At the same time, the second linkage drives the lock to move, and the lock also drives the leakage indicator to swing relatively, thereby completing the switching of the leakage status indication.

[0060] The utility model also discloses a small circuit breaker, which comprises a shell. The above-mentioned leakage tripping mechanism is arranged in the shell. By arranging the above-mentioned leakage tripping mechanism, the leakage protection function is realized.

[0061] The embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A leakage tripping mechanism, characterized by: It includes: A handle (200) rotatably disposed within the housing (100); A linkage rod (800) rotatably disposed within the housing (100); A lock catch (900) rotatably arranged on the linkage rod (800), wherein the lock catch (900) cooperates with the linkage rod (800) to form a locking position (1000), and the locking position (1000) can form an opening when the lock catch (900) rotates relative to the linkage rod (800); A U-shaped connecting rod (700), one end of which is located in the locking position (1000) and the other end of which is linked to the handle (200); A leakage release (300) disposed in the housing (100); A tripping rod (400) is rotatably arranged in the housing (100) and is linked with the leakage release (300); A reset member (410) is fixedly disposed on the tripping rod (400), and one end of the reset member extends to the moving path of the linkage rod (800). The tripping rod (400) comprises: A rotating portion (420) is rotationally coupled with the housing (100); A first linkage portion (430) extends downward from the rotating portion (420) and is positioned at the front end of the top rod of the leakage release (300); The second linkage portion (440) extends from the rotating portion (420) toward one side of the linkage rod (800) and is located on the upper side of the first linkage portion (430) for forming a linkage with the lock catch (900).

2. The leakage tripping mechanism according to claim 1, characterized in that: A shielding cover is provided on the outer side of the leakage release (300).

3. The leakage tripping mechanism according to claim 1, characterized in that: The rotating portion (420) has a positioning hole, and a positioning shaft (110) matching the positioning hole is provided in the housing (100). The positioning shaft (110) is inserted into the positioning hole and forms a rotational connection between the tripping rod (400) and the positioning shaft (110).

4. The leakage tripping mechanism according to claim 1, characterized in that: The first linkage portion (430) extends along the outer contour of the leakage release (300), and a mating surface (490) is provided at the mating position between the first linkage portion (430) and the top rod of the leakage release (300).

5. The leakage tripping mechanism according to claim 1, characterized in that: The reset element (410) is a reset torsion spring.

6. The leakage tripping mechanism according to claim 5, characterized in that: A first limiting seat (470) is provided between the first linkage part (430) and the second linkage part (440), a positioning protrusion (460) is provided on the first linkage part (430) near the rotating part (420), a second limiting seat (480) is provided on the upper side of the positioning protrusion (460), and the reset torsion spring is sleeved outside the positioning protrusion (460), one end of the reset torsion spring is limited by the second limiting seat (480), and the other end of the reset torsion spring is limited in its extension direction by the first limiting seat (470), so that the reset torsion spring extends to the moving path of the linkage rod (800).

7. The leakage tripping mechanism according to claim 1, 5 or 6, characterized in that: One end of the linkage rod (800) is provided with a protrusion (810) for forming a linkage fit with the reset member (410).

8. The leakage tripping mechanism according to claim 1, characterized in that: The leakage tripping mechanism is also provided with a leakage indicating component.

9. The leakage tripping mechanism according to claim 8, characterized in that: The leakage indication component comprises: A leakage lock buckle (500) rotatably arranged in the housing; A leakage indicator (600) rotatably arranged in the housing, The leakage lock buckle (500) is overlapped with the leakage indicator (600) and restricts the rotation of the leakage indicator (600); the tripping rod extends upward to form a linkage rod that forms a linkage with the leakage lock buckle (500); and the leakage indicator (600) forms a linkage with the lock buckle.

10. A miniature circuit breaker comprising a housing, characterized in that: The housing is provided with the leakage tripping mechanism according to any one of claims 1 to 9.

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