Tripping device for circuit breaker

Abstract

The invention belongs to the technical field of circuit breakers, and discloses a tripping device for a circuit breaker, the tripping device is provided with a rotating shaft assembly and a spur rack assembly, the rotating shaft assembly is composed of a rotating shaft main body capable of moving up and down and rotating around a shaft, a cylindrical gear and a telescopic limiting rod, and the surface of the rotating shaft main body above the cylindrical gear is provided with a spiral sliding groove; a rotating shaft body of the cylindrical gear and the spiral sliding groove is sleeved with a moving contact assembly with a moving contact, the moving contact assembly can only move up and down along with the rotating shaft body, the rotating shaft body is sleeved with a switch capable of driving the rotating shaft body to rotate and move up and down, and the spur rack assembly is provided with a static contact and a spur rack meshed with the cylindrical gear. The static contact and the moving contact are connected and disconnected through the up-down movement of the rotating shaft main body; the device has the advantages of being simple in structure, low in cost, capable of preventing misoperation and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of circuit breakers, and in particular relates to a tripping device for circuit breakers. Background Art

[0002] Circuit breakers are widely used in various industrial production activities. With the rapid development of standardization and automation, circuit breakers are also used in various industries. During the use of existing multifunctional circuit breakers, the function of preventing false triggering of opening and closing cannot fully meet the various harsh use environments of actual applications, which can easily cause unsafe accidents, damage power connection facilities, and endanger personal safety.

[0003] In the prior art, CN221057343U discloses a tripping device and a circuit breaker, including an electromagnetic component and a tripping box component connected to the electromagnetic component, wherein the electromagnetic component is used to access a conductive circuit having a contact component. The tripping box component cooperates with the contact component for transmission, and when a fault occurs, the current in the circuit increases instantaneously, thereby causing the electromagnetic component connected to the conductive circuit to respond, thereby driving the tripping box component to move linearly, so that the tripping box component is separated from the contact component, and the transmission cooperation between the tripping box component and the contact component is released, so that the contact component can be smoothly switched from the closed state to the open state, and the conductive circuit is disconnected.

[0004] The above-mentioned prior art has the following shortcomings: 1. The structure is relatively complex; 2. It cannot effectively prevent misoperation. Summary of the invention

[0005] In order to solve the above problems, the purpose of the present invention is to disclose a tripping device for a circuit breaker, which is implemented by adopting the following technical solutions.

[0006] A tripping device for a circuit breaker comprises a rotating shaft assembly and a spur rack assembly, wherein the rotating shaft assembly is capable of driving a moving contact to move up and down, and when the moving contact is at the highest point, the moving contact is disconnected from the static contact, and the position of the moving contact is limited at this time, and when the moving contact is at the lowest point, the moving contact is connected to the static contact, and the spur rack assembly is meshed with the rotating shaft assembly to drive the rotating shaft assembly to rotate, and the spur rack assembly is driven by the electromagnet assembly to move in a left straight line.

[0007] The above-mentioned tripping device for circuit breaker is characterized in that: the rotating shaft assembly is composed of a rotating shaft body that can move up and down and rotate around the axis, a column gear and a telescopic limit rod, the column gear is fixed on the rotating shaft body and is coaxial with the rotating shaft body, a spiral slide groove is provided on the surface of the rotating shaft body above the column gear, the axis of the spiral slide groove is coaxial with the rotating shaft body, one end of the telescopic limit rod is connected to the bottom of the column gear, the rotating shaft body below the column gear is sleeved with an elastic telescopic component, the lower end of the elastic telescopic component is fixed to the circuit breaker housing, and the upper end of the elastic telescopic component is rotatably connected to the lower wall of the column gear by the axis of the column gear; A moving contact assembly is sleeved on the rotating shaft body between the column gear and the spiral slide groove, the moving contact is located on the moving contact assembly, and the moving contact assembly can only move up and down with the rotating shaft body; A switch is sleeved on the rotating shaft body outside the spiral slide groove. The switch is composed of a switch body and a sliding head. A second through hole is provided in the switch body and is used to be sleeved with the rotating shaft body. One end of the sliding head is fixed to the inner wall of the through hole, and the other end of the sliding head can slide along the spiral slide groove. The switch body can only rotate around the axis of the second through hole. The spur rack assembly is composed of an electromagnet assembly, a static contact, a spur rack, a connecting rod and a limit plate. The electromagnet assembly is composed of a coil and a moving iron core. The moving iron core is linearly slidably connected to the coil. The static contact is fixed above the coil. The right end of the spur rack is fixed to the left end of the moving iron core. The upper end of the connecting rod is fixed to the left end of the spur rack. The limit plate is fixed to the lower end of the connecting rod. The coil is fixed to the circuit breaker housing. The spur rack meshes with the column gear, the column gear is located in front of the spur rack, and the moving contact is located directly above the stationary contact; When the sliding head is located at the top of the spiral slide groove, the movable end of the telescopic limit rod moves to the bottom of the limit plate and is supported by the lower surface of the limit plate, the moving contact is located at the low point, and the static contact and the moving contact are connected; when the sliding head is located at the bottom of the spiral slide groove, the movable end of the telescopic limit rod is disengaged from the limit plate, the moving contact is located at the high point, and the static contact and the moving contact are disengaged.

[0008] In the above-mentioned tripping device for circuit breaker, two limiting rings are arranged on the rotating shaft body, the two limiting rings are located between the column gear and the spiral slide groove, a limiting groove is formed between the two limiting rings, and the moving contact assembly is sleeved with the limiting groove.

[0009] In the above-mentioned tripping device for circuit breaker, the moving contact assembly is composed of a mounting plate and a moving contact. A first through hole which is transparent from top to bottom is provided at the left end of the mounting plate. The moving contact is fixed below the mounting plate. The first through hole is sleeved with the limiting groove.

[0010] In the above-mentioned tripping device for circuit breaker, two annular slide rails are also provided on the switch, the two annular slide rails are respectively located on the upper and lower side walls of the switch body, the annular slide rails are coaxial with the through hole, and the annular slide rails are annularly slidably connected to the circuit breaker housing.

[0011] In the above-mentioned tripping device for a circuit breaker, a push component is also provided on the switch, and the push component is fixed to the annular side wall of the switch body.

[0012] In the above-mentioned tripping device for a circuit breaker, the lower surface of the limiting plate forms a slope.

[0013] In the above-mentioned tripping device for a circuit breaker, the height of the spiral slide groove is smaller than the height of the column gear.

[0014] In the above-mentioned tripping device for a circuit breaker, the elastic telescopic component is a spring.

[0015] In the above-mentioned tripping device for a circuit breaker, the switch is made of insulating material.

[0016] In the above-mentioned tripping device for circuit breaker, the moving contact and the stationary contact are made of silver.

[0017] The present invention has the following beneficial effects: 1. Simple structure, few parts, relatively low failure rate and low cost.

[0018] 2. When the moving contact and the stationary contact are in the connected state, the switch cannot be turned, which can prevent the moving contact and the stationary contact from being separated due to misoperation, thereby causing the line to be disconnected.

[0019] 3. When there is a leakage and the moving contact and the static contact cannot be separated due to a fault, in an emergency, manual separation can be achieved by using a small rod to push the movable end of the telescopic limit rod to the separation limit plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of the three-dimensional structure of the rotating shaft assembly according to an embodiment of the present invention.

[0022] Figure 3 It is a schematic diagram of the three-dimensional structure of the spur rack assembly according to an embodiment of the present invention.

[0023] Figure 4 It is a schematic diagram of the three-dimensional structure of the moving contact assembly according to an embodiment of the present invention.

[0024] Figure 5 It is a schematic diagram of the three-dimensional structure of the switch according to the embodiment of the present invention.

[0025] In the figure, 1. shaft assembly, 11. shaft body, 12. spiral slide groove, 13. limit ring, 14. limit groove, 15. column gear, 16. telescopic limit rod, 2. spur rack assembly, 21. coil, 22. moving iron core, 23. static contact, 24. spur rack, 25. connecting rod, 26. limit plate, 3. moving contact assembly, 31. mounting plate, 32. first through hole, 33. moving contact, 4. switch, 41. switch body, 42. second through hole, 43. annular slide rail, 44. push component, 45. sliding head, 5. spring. DETAILED DESCRIPTION

[0026] like Figures 1 to 5 , a tripping device for a circuit breaker, comprising a rotating shaft assembly 1 and a spur rack assembly 2; The rotating shaft assembly 1 is composed of a rotating shaft body 11 that can move up and down and rotate around the axis, two limiting rings 13, a column gear 15 and a telescopic limiting rod 16. The two limiting rings 13 and the column gear 15 are fixed on the rotating shaft body 11 and are coaxial with the rotating shaft body 11. The two limiting rings 13 are located above the column gear 15. A limiting groove 14 is formed between the two limiting rings 13. A spiral groove 12 is provided on the surface of the rotating shaft body 11 above the two limiting rings 13. The axis of the spiral groove 12 is coaxial with the rotating shaft body 11. One end of the telescopic limiting rod 16 is connected to the bottom of the column gear 15. A spring 5 is sleeved on the rotating shaft body 11 below the column gear 15. The lower end of the spring 5 is fixed to the circuit breaker housing, and the upper end of the spring 5 is rotatably connected to the lower wall of the column gear 15 by the axis of the column gear 15. A moving contact assembly 3 is sleeved in the limiting groove 14. The moving contact assembly 3 is composed of a mounting plate 31 and a moving contact 33. A first through hole 32 which is transparent from top to bottom is provided at the left end of the mounting plate 31. The first through hole 32 is sleeved with the limiting groove 14. The moving contact 33 is fixed below the mounting plate 31. The mounting plate 31 can only move up and down with the rotating shaft body 11. A switch 4 is sleeved on the rotating shaft body 11 above the limiting ring 13. The switch 4 is composed of a switch body 41, two annular slide rails 43, a push component 44 and a slide head 45. A second through hole 42 which is transparent from top to bottom and is used for sleeved with the rotating shaft body 11 is provided in the switch body 41. One end of the slide head 45 is fixed to the inner wall of the through hole 42. The push component 44 is fixed to the annular side wall of the switch body 41. The two annular slide rails 43 are respectively located on the upper and lower side walls of the switch body 41. The annular slide rails 43 are coaxial with the through hole 42. The other end of the slide head 45 can slide along the spiral slide groove 12. The annular slide rail 43 is connected to the circuit breaker housing in an annular sliding manner. The spur rack assembly 2 is composed of a coil 21, a moving iron core 22, a stationary contact 23, a spur rack 24, a connecting rod 25 and a limiting plate 26. The moving iron core 22 is linearly connected to the coil 21, the stationary contact 23 is fixed above the coil 21, the right end of the spur rack 24 is fixed to the left end of the moving iron core 22, the upper end of the connecting rod 25 is fixed to the left end of the spur rack 24, the limiting plate 26 is fixed to the lower end of the connecting rod 25, the lower surface of the limiting plate 26 forms a slope, and the coil 21 is fixed to the circuit breaker housing; The spur rack 24 meshes with the column gear 15, the column gear 15 is located in front of the spur rack 24, and the moving contact 33 is located directly above the stationary contact 23; When the sliding head 45 is located at the top of the spiral groove 12, the movable end of the telescopic limit rod 16 moves to the bottom of the limit plate 26 and is supported by the lower surface of the limit plate 26, and the static contact 23 and the moving contact 33 are connected; when the sliding head 45 is located at the bottom of the spiral groove 12, the movable end of the telescopic limit rod 16 is disengaged from the limit plate 26, and the static contact 23 and the moving contact 33 are disengaged.

[0027] Working principle: When the electrical appliance leaks electricity, current flows through the coil 21, causing the moving iron core 22 to move toward the side of the spur rack 24, driving the limit plate 26 to move, causing the limit plate 26 to separate from the telescopic limit rod 16, and the spring 5 to push up the column gear 15, and the sliding head 45 slides to the bottom of the spiral slide groove 12, and the moving contact 33 and the static contact 23 separate, thereby achieving leakage protection; When it is necessary to reset, the switch 4 is rotated clockwise to make the sliding head 45 slide to the top of the spiral sliding groove 12. At this time, the movable end of the telescopic limit rod 16 is supported by the lower surface of the limit plate 26, and the spring 5 is in a compressed state. At this time, the moving contact 33 and the static contact 23 are connected; When it is necessary to temporarily manually disengage the moving contact 33 and the stationary contact 23 , it is only necessary to use a small rod to push the movable end of the telescopic limit rod 16 to disengage the limit plate 26 .

[0028] The present invention has the following beneficial effects: 1. Simple structure, few parts, relatively low failure rate and low cost.

[0029] 2. When the moving contact 33 and the stationary contact 23 are in a connected state, the switch 4 cannot be rotated, which can prevent the moving contact 33 and the stationary contact 23 from being separated due to misoperation, thereby causing the line to be disconnected.

[0030] 3. When there is a leakage and the moving contact 33 and the static contact 23 cannot be separated due to a fault, in an emergency, manual separation can be achieved by using a small rod to push the movable end of the telescopic limit rod 16 to the separation limit plate 26.

[0031] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including the equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A tripping device for a circuit breaker, comprising a rotating shaft assembly (1) and a spur rack assembly (2), characterized in that: The rotating shaft assembly (1) can drive the moving contact (33) to move up and down. When the moving contact (33) is at the highest point, the moving contact (33) is disconnected from the static contact (23). At this time, the position of the moving contact (33) is limited. When the moving contact (33) is at the lowest point, the moving contact (33) is connected to the static contact (23). The spur rack assembly (2) is meshed with the rotating shaft assembly (1) and can drive the rotating shaft assembly (1) to rotate. The spur rack assembly (2) is driven by the electromagnet assembly to move in a left straight line.

2. A tripping device for a circuit breaker according to claim 1, characterized in that: The shaft assembly (1) is composed of a shaft body (11) capable of moving up and down and rotating around an axis, a column gear (15) and a telescopic limit rod (16); the column gear (15) is fixed on the shaft body (11) and is coaxial with the shaft body (11); a spiral groove (12) is provided on the surface of the shaft body (11) above the column gear (15); the axis of the spiral groove (12) is coaxial with the shaft body (11); one end of the telescopic limit rod (16) is connected to the bottom of the column gear (15); an elastic telescopic component is sleeved on the shaft body (11) below the column gear (15); the lower end of the elastic telescopic component is fixed to the circuit breaker housing; the upper end of the elastic telescopic component is rotatably connected to the lower wall of the column gear (15) at the axis of the column gear (15); A moving contact assembly (3) is sleeved on the rotating shaft body (11) between the column gear (15) and the spiral slide groove (12), and the moving contact (33) is located on the moving contact assembly (3). The moving contact assembly (3) can only move up and down with the rotating shaft body (11); A switch (4) is sleeved on the rotating shaft body (11) outside the spiral slide groove (12), and the switch (4) is composed of a switch body (41) and a sliding head (45). A second through hole (42) which is transparent from top to bottom and is used for sleeved with the rotating shaft body (11) is provided in the switch body (41), one end of the sliding head (45) is fixed to the inner wall of the through hole (42), and the other end of the sliding head (45) can slide along the spiral slide groove (12), and the switch body (41) can only rotate around the axis of the second through hole (42); The spur rack assembly (2) is composed of an electromagnet assembly, a stationary contact (23), a spur rack (24), a connecting rod (25) and a limit plate (26); the electromagnet assembly is composed of a coil (21) and a moving iron core (22); the moving iron core (22) is linearly slidably connected to the coil (21); the stationary contact (23) is fixed above the coil (21); the right end of the spur rack (24) is fixed to the left end of the moving iron core (22); the upper end of the connecting rod (25) is fixed to the left end of the spur rack (24); the limit plate (26) is fixed to the lower end of the connecting rod (25); and the coil (21) is fixed to the circuit breaker housing; The spur rack (24) is meshed with the column gear (15), the column gear (15) is located in front of the spur rack (24), and the moving contact (33) is located directly above the stationary contact (23); When the sliding head (45) is located at the top of the spiral slide groove (12), the movable end of the telescopic limit rod (16) moves to the bottom of the limit plate (26) and is supported by the lower surface of the limit plate (26), the moving contact (33) is located at the low point, and the static contact (23) and the moving contact (33) are connected; when the sliding head (45) is located at the bottom of the spiral slide groove (12), the movable end of the telescopic limit rod (16) is disengaged from the limit plate (26), the moving contact (33) is located at the high point, and the static contact (23) and the moving contact (33) are disengaged.

3. A tripping device for a circuit breaker according to claim 2, characterized in that: Two limiting rings (13) are arranged on the rotating shaft body (11). The two limiting rings (13) are located between the column gear (15) and the spiral slide groove (12). A limiting groove (14) is formed between the two limiting rings (13). The moving contact assembly (3) is sleeved with the limiting groove (14).

4. A tripping device for a circuit breaker according to claim 3, characterized in that: The moving contact assembly (3) is composed of a mounting plate (31) and a moving contact (33). A first through hole (32) which is transparent from top to bottom is provided at the left end of the mounting plate (31). The moving contact (33) is fixed below the mounting plate (31). The first through hole (32) is sleeved with the limiting groove (14).

5. A tripping device for a circuit breaker according to claim 4, characterized in that: The switch (4) is also provided with two annular slide rails (43), which are respectively located on the upper and lower side walls of the switch body (41), the annular slide rails (43) are coaxial with the through hole (42), and the annular slide rails (43) are annularly slidably connected with the circuit breaker housing.

6. A tripping device for a circuit breaker according to claim 5, characterized in that: The switch (4) is also provided with a push component (44), which is fixed to the annular side wall of the switch body (41).

7. A tripping device for a circuit breaker according to claim 6, characterized in that: The lower surface of the limiting plate (26) forms a slope.

8. A tripping device for a circuit breaker according to claim 7, characterized in that: The height of the spiral slide groove (12) is smaller than the height of the column gear (15).

9. A tripping device for a circuit breaker according to claim 8, characterized in that: The elastic telescopic component is a spring (5).

10. A tripping device for a circuit breaker according to any one of claims 1 to 9, characterized in that: The material of the moving contact (33) and the stationary contact (23) is silver.

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