Tripping mechanism and residual-current circuit breaker

Abstract

The utility model discloses a tripping mechanism easy to trip and a residual-current circuit breaker. According to the technical scheme, the integrated tripping rod comprises a push rod, a rotating shaft integrally formed at the upper end of the push rod and a linkage arm integrally formed on one side of the push rod, the upper end of the push rod extends upwards to form a hanging buckle, a tripping plate is integrally formed on one side of the linkage arm, and an open groove is formed in the lower portion of the hanging buckle; the lower end of the reset button is provided with a hanging groove matched with the hanging buckle, and the lower portion of the hanging groove is provided with an inclined tripping face which extends into the open groove and is matched with the hanging buckle and a reset pressure exerting part which exerts pressure on the linkage arm.

Description

Technical Field

[0001] This utility model belongs to the field of low-voltage electrical equipment, and in particular relates to a miniature circuit breaker. Background Technology

[0002] To improve electrical safety, miniature circuit breakers typically include residual current protection (RCD). When the leakage current in the circuit exceeds a predetermined value, the RCD automatically triggers the tripping mechanism, which quickly cuts off the power supply, ensuring personal safety and preventing electric shock accidents. The structure of a traditional miniature circuit breaker with RCD protection is illustrated in Chinese Utility Model Patent No. CN102136401 B, entitled "A Miniature Circuit Breaker with Residual Current Protection." Its tripping mechanism includes an electromagnetic trip unit, a lever, and a connecting shaft. The upper end of the lever is attached to the slot of the reset button, and the connecting shaft trips the circuit breaker's latch. During tripping: the moving iron core of the electromagnetic trip unit drives the lever to rotate, separating the upper end of the lever from the reset button. Simultaneously, the lower end of the lever drives the connecting shaft, causing the circuit breaker's latch to separate from the trip button, thus completing the tripping process. Because it directly uses the force of the magnetic trip unit to drive the connecting shaft to trip, the resistance is relatively large. Under harsh working conditions, it is very easy to cause the coil to burn out and the circuit to break, resulting in product failure. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide an easy-to-release tripping mechanism and a residual current circuit breaker.

[0004] To solve the above problems, the technical solution adopted by this utility model includes: a tripping mechanism, characterized in that it includes:

[0005] An integrated release lever includes a push rod, a pivot integrally formed on the upper end of the push rod, and a linkage arm integrally formed on one side of the push rod. A hook extends upward from the upper end of the push rod, and a release plate is integrally formed on one side of the linkage arm. A slot is provided below the hook.

[0006] The reset button has a hanging groove at its lower end that engages with the hook, and below the hanging groove is an inclined release surface that extends into the groove and engages with the hook, and a reset pressure part that applies pressure to the linkage arm.

[0007] A reset torsion spring is sleeved on the rotating shaft, with its first lever arm connected to the push rod and its second lever arm connected to the reset pressure part;

[0008] A tripping torsion spring is installed inside the housing of the residual current circuit breaker, with its third lever arm connected to the housing of the residual current circuit breaker and its fourth lever arm connected to the bottom of the inclined tripping surface;

[0009] An electromagnetic trip unit, which cooperates with the push rod.

[0010] The tripping mechanism is characterized in that: a lever arm positioning groove is provided at the bottom of the inclined tripping surface.

[0011] The tripping mechanism is characterized in that: a second lever arm positioning post is provided on the reset pressure part.

[0012] The tripping mechanism is characterized in that: positioning sliders are integrally formed on both sides of the reset button.

[0013] The release mechanism is characterized in that: the hook is provided with an inclined sliding surface that cooperates with the inclined release surface.

[0014] The tripping mechanism is characterized in that it further includes a positioning post integrally formed inside the housing of the residual current circuit breaker for positioning the fourth lever arm.

[0015] The tripping mechanism is characterized in that the inclination angle of the inclined tripping surface is 55°-65°.

[0016] A residual current circuit breaker includes a housing, characterized in that: the housing is equipped with a tripping mechanism as described in any one of the above claims.

[0017] The advantages of the tripping mechanism and residual current circuit breaker of this utility model are as follows: The electromagnetic tripping device only needs to use instantaneous force to separate the integrated tripping rod from the reset button. After separation, the integrated tripping rod is driven to trip by the tripping torsion spring. Therefore, it will not cause the coil to burn out, and the tripping is more stable and reliable.

[0018] The present invention will be further described below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the release mechanism of this utility model;

[0020] Figure 2 This is a structural schematic diagram of the integrated release lever of this utility model;

[0021] Figure 3 This is a front structural diagram of the residual current circuit breaker of this utility model;

[0022] Figure 4 This is a schematic diagram of the back structure of the residual current circuit breaker of this utility model. Detailed Implementation Example 1:

[0023] Reference Figure 1-2As shown, the tripping mechanism of this utility model includes: an integrated tripping rod 1, a reset button 2, a reset torsion spring 3, a tripping torsion spring 4, and an electromagnetic tripping device 5. The integrated tripping rod 1 includes a push rod 6, a rotating shaft 7 integrally formed on the upper end of the push rod 6, and a linkage arm 8 integrally formed on one side of the push rod 6. The rotating shaft 7 rotatably mounts the integrated push rod 6 into the housing of the residual current circuit breaker. A hook 9 extends upward from the upper end of the push rod 6, and a tripping plate 10 is integrally formed on one side of the linkage arm 8. The tripping plate 10 is used to engage with the locking mechanism of the residual current circuit breaker. A slot 11 is provided below the hook 9. The lower end of the reset button 2 is provided with a hook groove 13 that engages with the hook 9. Below the hook groove 13, there is an inclined tripping surface 14 that extends into the slot 11 and engages with the hook 9, and a reset pressure part 15 that applies pressure to the linkage arm 8. The reset torsion spring 3 is sleeved on the rotating shaft 7. The first lever arm 16 of the reset torsion spring 3 is connected to the push rod 6, and the second lever arm 17 of the reset torsion spring 3 is connected to the reset pressure part 15. When reset is required: by pressing the reset button 2, the reset pressure part 15 applies pressure to the linkage arm 8, thereby driving the integrated trip rod 1 to rotate, and then hooking the hook 9 into the hanging slot 13. The trip torsion spring 4 is installed in the housing of the residual current circuit breaker. The third lever arm 18 of the trip torsion spring 4 is connected to the housing of the residual current circuit breaker, and the fourth lever arm 19 of the trip torsion spring 4 is connected to the bottom of the inclined trip surface 14. The fourth lever arm 19 gives the trip torsion spring 4 a large upward force. The electromagnetic trip device 5 is located on one side of the lower end of the push rod 6 and cooperates with the push rod 6. During tripping: The moving iron core of the electromagnetic trip unit 5 extends and presses against the push rod 6, causing the hook 9 and the slot 13 to separate. Because the tripping torsion spring 4 has a large upward force, its inclined tripping surface 14 can press against the lower end of the hook 9 to drive the rotation of the integrated tripping rod 1, thereby completing the tripping using the tripping plate 10. Note: To achieve smooth tripping, the torque of the tripping torsion spring 4 should be much greater than that of the reset torsion spring 3, typically 2-3 times greater.

[0024] Preferably, the bottom of the inclined release surface 14 is provided with a lever arm positioning groove 20 for more stable connection of the fourth lever arm 19 of the release torsion spring 4.

[0025] Preferably, the reset pressure part 15 is provided with a second lever arm positioning post 21 for more stable connection of the second lever arm 17 of the reset torsion spring 3.

[0026] Preferably, the reset button 2 has a positioning slider 22 integrally formed on both sides. The positioning slider 22 cooperates with the slide rail inside the leakage circuit breaker housing to reduce the resistance when the reset button 2 slides, thereby making it easier to reset.

[0027] Preferably, the hook 9 is provided with an inclined sliding surface 23 that cooperates with the inclined release surface 14. The cooperation of the two inclined surfaces makes it easier to rotate the integrated release lever 1. The inclination angle of the inclined release surface 14 is 55°-65°, ideally 60°.

[0028] Preferably, it also includes a positioning post 24 integrally formed inside the housing of the residual current circuit breaker for positioning the fourth lever arm 19, so as to position the fourth lever arm 19 after it is in place. Example 2:

[0029] Reference Figure 3-4 As shown, this utility model includes a housing 25, within which the release mechanism described in Embodiment 1 is installed. On the other side of the housing 25, components such as a latch 26 and a jump catch 27 are installed. The release plate 10 of the release mechanism extends into this side and connects to the unlocking part 28 of the latch 26. By applying an upward force to the unlocking part 28, separation from the jump catch 27 is achieved, thereby completing the release. The release principle of the latch 26 and the jump catch 27 is known technology and will not be described in detail here.

[0030] As stated above, this is not intended to limit the present invention in any way. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed structure and technical content to create equivalent embodiments without departing from the scope of the present invention. However, any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A tripping mechanism, characterized in that, include: An integrated release lever (1) includes a push rod (6), a pivot (7) integrally formed on the upper end of the push rod (6), and a linkage arm (8) integrally formed on one side of the push rod (6). A hook (9) extends upward from the upper end of the push rod (6), and a release plate (10) integrally formed on one side of the linkage arm (8). A slot (11) is provided below the hook (9). The reset button (2) has a hanging groove (13) at its lower end that cooperates with the hook (9). Below the hanging groove (13) is an inclined release surface (14) that extends into the slot (11) and cooperates with the hook (9) and a reset pressure part (15) that applies pressure to the linkage arm (8). A reset torsion spring (3) is fitted onto the rotating shaft (7), with its first lever arm (16) connected to the push rod (6) and its second lever arm (17) connected to the reset pressure part (15). The tripping torsion spring (4) is installed inside the housing of the residual current circuit breaker. Its third lever arm (18) is connected to the housing of the residual current circuit breaker, and its fourth lever arm (19) is connected to the bottom of the inclined tripping surface (14). The electromagnetic trip unit (5) is used in conjunction with the push rod (6).

2. The tripping mechanism according to claim 1, characterized in that: The bottom of the inclined release surface (14) is provided with a lever arm positioning groove (20).

3. The tripping mechanism according to claim 1, characterized in that: The reset pressure part (15) is provided with a second lever arm positioning post (21).

4. The tripping mechanism according to claim 1, characterized in that: The reset button (2) has positioning sliders (22) integrally formed on both sides.

5. The tripping mechanism according to claim 1, characterized in that: The hook (9) is provided with an inclined sliding surface (23) that cooperates with the inclined release surface (14).

6. The tripping mechanism according to claim 1, characterized in that: It also includes a positioning post (24) integrally formed inside the housing of the residual current circuit breaker for positioning the fourth lever arm (19).

7. The tripping mechanism according to claim 1, characterized in that: The tilt angle of the tilted tripping surface (14) is 55°-65°.

8. A residual current circuit breaker, comprising a housing (25), characterized in that: The housing (25) is equipped with a tripping mechanism as described in any one of claims 1-7.

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