Contact opening increasing and overtravel angle deflection structure of moving contact

Abstract

The application relates to the technical field of circuit breakers, in particular to a movable contact angle deflection structure capable of increasing the opening distance of contacts without changing the overtravel, which comprises a movable contact mounted on the front side of the base, a static contact mounted on the rear side of the base, and a connecting rod mounted between the cantilever and the movable contact; the length ratio of the cantilever and the connecting rod is adjusted, the backward tilting angle of the movable contact is changed, the contact support structure of the movable contact is changed, the left and right clamping plates of the movable contact are shifted, the opening distance between the movable contact and the static contact is increased, the electrical gap between the contacts is increased, the insulation level of the circuit breaker is improved, the breaking capacity of the product is improved, the overtravel of the movable contact is not changed, the contact is good, a limiting rod is designed, the movable contact clamping plate is elastically limited after the movable contact and the static contact are separated, the opening distance between the movable contact and the static contact is not reduced when the circuit breaker is opened, and the insulation level is not reduced.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a moving contact angle deflection structure that increases the contact opening distance without changing the overtravel. Background Technology

[0002] Circuit breakers are crucial protection and control devices in power systems. Their core function is to connect and disconnect load current during normal operation and to quickly interrupt short-circuit current during fault conditions, thereby ensuring the safety of the power system and electrical equipment. Among the performance indicators of circuit breakers, contact gap and overtravel are two extremely critical parameters. Contact gap refers to the minimum electrical clearance between the moving and stationary contacts when the circuit breaker is open. Overtravel refers to the distance the moving contact continues to travel after the circuit breaker is closed, relative to the distance it traveled when it just contacted the stationary contact. Overtravel ensures sufficient contact pressure between the moving and stationary contacts, thus guaranteeing good conductivity.

[0003] In existing technologies, conventional circuit breaker products have a relatively small opening distance between the moving and stationary contacts. Insufficient opening distance directly leads to insufficient electrical clearance margin between contacts. Under high-voltage conditions, the contact gap is prone to arcing and re-breakdown, which seriously affects the insulation performance and breaking reliability of the circuit breaker. If the opening distance is increased by directly increasing the swing amplitude of the moving contact, it will cause changes in the overtravel, which in turn affects the contact pressure and conductivity between the moving and stationary contacts, and may even cause problems such as poor contact and excessive temperature rise. Therefore, a moving contact angle deflection structure that increases the contact opening distance without changing the overtravel is needed to improve the above problems. Summary of the Invention

[0004] To address this issue, the present invention provides a moving contact angle deflection structure that increases the contact gap without changing the overtravel, thereby solving the aforementioned problems.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A moving contact angle deflection structure that increases the contact opening distance without changing the overtravel includes a base, an operating mechanism installed on the front side of the base, a main shaft installed between the operating mechanism and the base, multiple cantilever arms installed above the main shaft, a moving contact installed on the front side inside the base, a stationary contact installed on the rear side inside the base, and a connecting rod installed between the cantilever arms and the moving contact. A bracket is installed inside the lower part of the base. Moving contact clamps are provided on both sides of the moving contact. The lower end of the moving contact clamp is located inside the bracket and rotatably connected to the bracket. An installation groove is opened on the inner side of the bracket near the moving contact clamp. An installation plate is installed inside the installation groove. A limit rod is rotatably connected to one side of the installation plate. An elastic plate is fixedly connected below the limit rod. The elastic plate is inclined and forms a gap with the inner wall of the installation groove. One side of the limit rod protrudes from the installation groove and is located on one side of the moving contact clamp. A limit plate is fixedly connected to the upper part of one end of the installation plate. The limit plate is inclined and located in front of the elastic plate. A main elastic rod is fixedly connected to one end of the installation plate. One end of the main elastic rod is located on one side of the elastic plate.

[0006] Preferably, a connecting pin is installed between one end of the cantilever and one end of the connecting rod, and one end of the cantilever is inserted into the inside of one end of the connecting rod and rotatably connected by the connecting pin.

[0007] Preferably, the lower end of the moving contact clamp has a rotating shaft passing through it, the rotating shaft is rotatably connected to the bracket, and the rotating shaft is away from the stationary contact.

[0008] Preferably, a mounting shaft hole is fixedly connected to one side of the mounting plate. The mounting shaft hole passes through the lower end of the elastic plate, and the elastic plate is rotatably connected to the mounting plate through the mounting shaft hole. A locking bolt is threaded inside the mounting shaft hole, and one end of the locking bolt is screwed into the mounting groove.

[0009] Preferably, the mounting plate has a protrusion on the side away from the limiting plate, and the protrusion is located on the side of the elastic plate.

[0010] Preferably, the distance between the limiting plate at one end of the elastic plate and the inner wall of the mounting groove is greater than the distance between the other end of the limiting plate and the inner wall of the mounting groove.

[0011] Preferably, a secondary elastic rod is fixedly connected to one side of the mounting plate on the side of the main elastic rod. A connecting bolt is threaded onto the secondary elastic rod, and one end of the connecting bolt can be screwed into the main elastic rod. The secondary elastic rod does not contact the elastic plate.

[0012] Preferably, a secondary elastic rod is fixedly connected to one side of the mounting plate on the other side of the main elastic rod. One end of the secondary elastic rod has a slot, and one end of the main elastic rod is threaded with a connecting bolt. The connecting bolt corresponds to the slot position, and one end of the connecting bolt can be screwed into the secondary elastic rod. The secondary elastic rod does not contact the elastic plate.

[0013] Preferably, the main elastic rod, secondary elastic rod one, and secondary elastic rod two are made of the same material, but the thicknesses of the main elastic rod, secondary elastic rod one, and secondary elastic rod two are different.

[0014] Preferably, the main elastic rod, secondary elastic rod one, and secondary elastic rod two are made of different materials, and the elastic coefficients of the main elastic rod, secondary elastic rod one, and secondary elastic rod two are different.

[0015] Compared with the prior art, the present invention changes the backward tilt angle of the moving contact by adjusting the ratio of the cantilever and the connecting rod lengths, while also changing the contact support structure of the moving contact and shifting the rotation positioning of the left and right clamps of the moving contact, thereby increasing the opening distance between the moving contact and the stationary contact. This is beneficial to increasing the electrical clearance between the contacts, improving the insulation level of the circuit breaker, and improving the breaking capacity of the product, without changing the overtravel of the moving contact, thus ensuring good contact. This invention incorporates a limiting rod that elastically limits the moving contact clamp after the moving contact separates from the stationary contact. This prevents the moving contact from rebounding and reducing the opening distance with the stationary contact during opening, thus avoiding a decrease in insulation level. Furthermore, the design includes a main elastic rod and a secondary elastic rod, which can be adjusted to control the elastic force that the moving contact needs to overcome when closing. This allows for adjustments to the resistance required when closing the circuit based on different installation conditions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the base when the circuit is closed according to the present invention; Figure 3 This is a schematic diagram of the internal structure of the base during the tripping operation of the present invention; Figure 4 This is a schematic diagram of the structure of the moving contact of the present invention; Figure 5 For the present invention Figure 4 A magnified structural diagram of A in the middle; Figure 6 This is a schematic diagram of the mounting plate of the present invention; Figure 7 This is a schematic diagram of the limiting rod of the present invention; Figure 8 This is a schematic diagram of the main elastic rod of the present invention.

[0017] In the diagram: 1. Base; 2. Operating mechanism; 3. Main shaft; 4. Cantilever; 5. Stationary contact; 6. Moving contact; 7. Connecting rod; 8. Connecting pin; 9. Moving contact clamp; 10. Bracket; 11. Rotating shaft; 12. Mounting slot; 13. Mounting plate; 14. Limiting rod; 141. Elastic plate; 15. Limiting plate; 16. Mounting shaft hole; 17. Locking bolt; 18. Main elastic rod; 181. Secondary elastic rod one; 182. Secondary elastic rod two; 183. Slot; 184. Connecting bolt one; 185. Connecting bolt two. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] Example: Please refer to Figure 1-8 The present invention discloses a moving contact angle deflection structure that increases the contact opening distance without changing the overtravel, comprising a base 1, an operating mechanism 2 installed on the front side of the base 1, a main shaft 3 installed between the operating mechanism 2 and the base 1, a plurality of cantilever 4 installed above the main shaft 3, a moving contact 6 installed on the front side inside the base 1, a stationary contact 5 installed on the rear side inside the base 1, and a connecting rod 7 installed between the cantilever 4 and the moving contact 6. A bracket 10 is installed inside the lower part of the base 1. Moving contact plates 9 are provided on both sides of the moving contact 6. The lower end of the moving contact plates 9 is located inside the bracket 10 and is rotatably connected to the bracket 10. An installation groove 12 is opened on the inner side of the bracket 10 near the moving contact plates 9. An installation plate 13 is installed inside the installation groove 12. A limit rod 14 is rotatably connected to one side of the installation plate 13. An elastic plate 141 is fixedly connected below the limit rod 14. The elastic plate 141 is inclined and forms a gap with the inner wall of the installation groove 12. One side of the limit rod 14 protrudes from the installation groove 12 and is located on one side of the moving contact plates 9. A limit plate 15 is fixedly connected to the upper part of one end of the installation plate 13. The limit plate 15 is inclined and located in front of the elastic plate 141. A main elastic rod 18 is fixedly connected to one end of the installation plate 13. One end of the main elastic rod 18 is located on one side of the elastic plate 141.

[0020] In this embodiment, specifically: a connecting pin 8 is installed between one end of the cantilever 4 and one end of the connecting rod 7, and one end of the cantilever 4 is inserted into the interior of one end of the connecting rod 7 and rotatably connected by the connecting pin 8.

[0021] In this embodiment, specifically: a rotating shaft 11 passes through the lower end of the moving contact clamp 9, and the rotating shaft 11 is rotatably connected to the bracket 10. The rotating shaft 11 is located away from the stationary contact 5. That is, the rotating shaft 11 is positioned on the side of the moving contact clamp 9 away from the stationary contact 5, meaning that the rotation center is located away from the stationary contact 5 relative to the contact surface of the moving contact 6. By positioning the rotating shaft 11 away from the stationary contact 5, the spatial relationship between the rotation center of the moving contact 6 and the contact surface is changed, allowing the moving contact 6 to obtain a larger effective opening distance increment during oscillation, while the overtravel remains unchanged.

[0022] In this embodiment, specifically: a mounting shaft hole 16 is fixedly connected to one side of the mounting plate 13, the mounting shaft hole 16 passes through the lower end of the elastic plate 141, the elastic plate 141 is rotatably connected to the mounting plate 13 through the mounting shaft hole 16, and a locking bolt 17 is threaded inside the mounting shaft hole 16, one end of the locking bolt 17 is screwed into the mounting groove 12.

[0023] In this embodiment, specifically: the mounting plate 13 has a protrusion on the side away from the limiting plate 15, and the protrusion is located on one side of the elastic plate 141. This prevents the elastic plate 141 from rotating to the other side.

[0024] In this embodiment, specifically: the distance between the limiting plate 15 at one end of the elastic plate 141 and the inner wall of the mounting groove 12 is greater than the distance between the other end of the limiting plate 15 and the inner wall of the mounting groove 12. When the circuit is closed, as the elastic plate 141 is pushed by the passive contact clamp 9 along with the limiting rod 14, the rotation of the elastic plate 141 is restricted by the limiting plate 15 and retracts into the mounting groove 12, thus preventing elastic limiting of the contact clamp 9.

[0025] In this embodiment, specifically: a secondary elastic rod 181 is fixedly connected to one side of the mounting plate 13, located on the side of the main elastic rod 18. A connecting bolt 184 is threaded onto the secondary elastic rod 181, and one end of the connecting bolt 184 can be screwed into the main elastic rod 18. The secondary elastic rod 181 does not contact the elastic plate 141. When it is necessary to increase the elastic resistance, the secondary elastic rod 181 is connected to the main elastic rod 18 as one unit by screwing in the connecting bolt 184. At this time, the secondary elastic rod 181 and the main elastic rod 18 jointly participate in the elastic support of the elastic plate 141, increasing the overall elastic stiffness. Consequently, the elastic resistance that the moving contact needs to overcome when closing increases accordingly.

[0026] In this embodiment, specifically: a secondary elastic rod 182 is fixedly connected to one side of the mounting plate 13 on the other side of the main elastic rod 18. One end of the secondary elastic rod 181 has a slot 183, and one end of the main elastic rod 18 is threaded with a connecting bolt 185. The connecting bolt 185 corresponds to the slot 183, and one end of the connecting bolt 185 can be screwed into the secondary elastic rod 182. The secondary elastic rod 182 does not contact the elastic plate 141. The secondary elastic rod 182 can be selectively connected to the main elastic rod 18 through the connecting bolt 185. When the connecting bolt 185 is screwed in, the secondary elastic rod 182 and the main elastic rod 18 are integrated, further increasing the elastic stiffness. The slot 183 design allows the connecting bolt 185 to have a certain adjustment stroke during screwing in, facilitating installation and fine-tuning of its position.

[0027] By combining the main elastic rod 18, secondary elastic rod one 181, and secondary elastic rod two 182 in different ways, various levels of elastic resistance can be adjusted: when only the main elastic rod 18 is working, the elastic resistance is minimal, suitable for applications with low closing force; when the main elastic rod 18 is connected to the secondary elastic rod one 181, the elastic resistance increases by one level, suitable for applications with medium closing force; when the main elastic rod 18 is connected to the secondary elastic rod two 182, the elastic resistance increases to another level, suitable for applications with different medium closing forces; when the main elastic rod 18, secondary elastic rod one 181, and secondary elastic rod two 182 are connected simultaneously, the elastic resistance is maximized, suitable for applications with high closing force.

[0028] In this embodiment, specifically: the main elastic rod 18, the first secondary elastic rod 181, and the second secondary elastic rod 182 are made of the same material, but the thicknesses of the main elastic rod 18, the first secondary elastic rod 181, and the second secondary elastic rod 182 are different. Different elastic coefficients are obtained by setting different thicknesses. Thicker elastic rods have greater stiffness and provide greater elastic force; thinner elastic rods have less stiffness and provide less elastic force. This scheme of achieving graded elastic coefficients through thickness differentiation design is simple to manufacture and has low cost.

[0029] In this embodiment, specifically: the main elastic rod 18, the first secondary elastic rod 181, and the second secondary elastic rod 182 are made of different materials, and their elastic moduli are different. The different elastic moduli are obtained by utilizing the inherent differences in the elastic moduli of the different materials. For example, the main elastic rod 18 can be made of spring steel, the first secondary elastic rod 181 can be made of beryllium copper alloy, and the second secondary elastic rod 182 can be made of stainless steel. The choice of different materials allows for a wider range of adjustment of the elastic moduli, meeting more diverse elastic resistance requirements.

[0030] In operation, this design adjusts the length ratio between the cantilever 4 and the connecting rod 7 to give the moving contact 6 a larger backward tilt angle compared to existing technologies at the final closing state. Simultaneously, the rotation axis 11 of the moving contact clamp 9 is shifted to a side farther from the stationary contact 5, changing the rotation center position of the moving contact 6. The synergistic effect of the change in tilt angle and the shift in rotation center allows the moving contact 6 to move to a position farther from the stationary contact 5 during opening, thus significantly increasing the opening distance between the moving and stationary contacts. Since the adjustment of the tilt angle and rotation center is a system optimization performed within the overall kinematic relationship of the linkage mechanism, it does not change the relative travel distance between the moving contact 6 and the stationary contact 5 on the closing contact surface. Therefore, the overtravel remains unchanged, ensuring that the contact pressure and conductivity between the moving and stationary contacts are unaffected.

[0031] When the circuit breaker trips, the operating mechanism 2 drives the main shaft 3 to rotate. The main shaft 3, through the cantilever 4 and connecting rod 7, moves the moving contact 6 away from the stationary contact 5. When the moving contact 6 reaches the final tripping position, the moving contact clamp 9 moves to the side of the limit rod 14. Under the elastic support of the main elastic rod 18, the limit rod 14 applies elastic resistance to the moving contact clamp 9, preventing the moving contact 6 from rebounding towards the stationary contact 5 due to inertia or the reaction force of the operating mechanism.

[0032] When the circuit breaker is closed, the moving contact 6 moves toward the stationary contact 5. When the moving contact 6 moves, the moving contact clamp 9 pushes the limit rod 14 to rotate around the mounting shaft hole 16. The elastic rod 141 presses the main elastic rod 18 to bend. At the same time, the elastic rod 141 is restricted by the limit plate 15 and retracts into the mounting groove 12. The moving contact clamp 9 thus loses the elastic restriction of the limit rod 14. When the moving contact 6 moves to the final closed position, the moving contact clamp 9 moves to the side of the limit rod 14.

[0033] All standard parts used in this application can be purchased from the market. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art and are also general components, which are common knowledge in this field.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A moving contact angle deflection structure that increases the contact gap without changing the overtravel, comprising a base (1), characterized in that: An operating mechanism (2) is installed on the front side of the base (1), a main shaft (3) is installed between the operating mechanism (2) and the base (1), a plurality of cantilever arms (4) are installed above the main shaft (3), a moving contact (6) is installed on the front side inside the base (1), a stationary contact (5) is installed on the rear side inside the base (1), and a connecting rod (7) is installed between the cantilever arms (4) and the moving contact (6). A bracket (10) is installed inside the base (1) at the bottom. Moving contact plates (9) are provided on both sides of the moving contact (6). The lower end of the moving contact plates (9) is located inside the bracket (10) and is rotatably connected to the bracket (10). An installation groove (12) is provided on the inner side of the bracket (10) near the moving contact plates (9). An installation plate (13) is installed inside the installation groove (12). A limit rod (14) is rotatably connected to one side of the installation plate (13). A limit rod (14) is fixedly connected below the limit rod (14). The elastic plate (141) is inclined and forms a gap with the inner wall of the mounting groove (12). The limiting rod (14) protrudes from the mounting groove (12) on one side and is located on the side of the moving contact clamp (9). A limiting plate (15) is fixedly connected above one end of the mounting plate (13). The limiting plate (15) is inclined and located in front of the elastic plate (141). A main elastic rod (18) is fixedly connected to one end of the mounting plate (13). One end of the main elastic rod (18) is located on one side of the elastic plate (141).

2. The moving contact angle deflection structure according to claim 1, which increases the contact gap without changing the overtravel, is characterized in that: A connecting pin (8) is installed between one end of the cantilever (4) and one end of the connecting rod (7). One end of the cantilever (4) is inserted into the interior of one end of the connecting rod (7) and is rotatably connected by the connecting pin (8).

3. The moving contact angle deflection structure according to claim 1, which increases the contact gap without changing the overtravel, is characterized in that: The lower end of the moving contact clamp (9) has a rotating shaft (11) passing through it. The rotating shaft (11) is rotatably connected to the bracket (10). The rotating shaft (11) is away from the stationary contact (5).

4. The moving contact angle deflection structure for increasing contact gap without changing overtravel according to claim 1, characterized in that: The mounting plate (13) is fixedly connected to a mounting shaft hole (16) on one side. The mounting shaft hole (16) passes through the lower end of the elastic plate (141). The elastic plate (141) is rotatably connected to the mounting plate (13) through the mounting shaft hole (16). A locking bolt (17) is threaded inside the mounting shaft hole (16). One end of the locking bolt (17) is screwed into the mounting groove (12).

5. The moving contact angle deflection structure according to claim 4, which increases the contact gap without changing the overtravel, is characterized in that: The mounting plate (13) has a protrusion on the side away from the limiting plate (15), and the protrusion is located on the side of the elastic plate (141).

6. The moving contact angle deflection structure according to claim 1, which increases the contact gap without changing the overtravel, is characterized in that: The distance between the limiting plate (15) at one end in front of the elastic plate (141) and the inner wall of the mounting groove (12) is greater than the distance between the other end of the limiting plate (15) and the inner wall of the mounting groove (12).

7. The moving contact angle deflection structure for increasing contact gap without changing overtravel according to claim 1, characterized in that: The mounting plate (13) is fixedly connected to a secondary elastic rod (181) on one side of the main elastic rod (18). A connecting bolt (184) is threaded onto the secondary elastic rod (181). One end of the connecting bolt (184) can be screwed into the main elastic rod (18). The secondary elastic rod (181) does not contact the elastic plate (141).

8. The moving contact angle deflection structure for increasing contact gap without changing overtravel according to claim 7, characterized in that: The mounting plate (13) is fixedly connected to a secondary elastic rod (182) on one side of the main elastic rod (18) and the other side of the secondary elastic rod (181). A slot (183) is provided at one end of the secondary elastic rod (181). A connecting bolt (185) is threaded to one end of the main elastic rod (18). The position of the connecting bolt (185) corresponds to the slot (183). One end of the connecting bolt (185) can be screwed into the secondary elastic rod (182). The secondary elastic rod (182) does not contact the elastic plate (141).

9. A moving contact angle deflection structure for increasing contact gap without changing overtravel according to claim 8, characterized in that: The main elastic rod (18), secondary elastic rod one (181), and secondary elastic rod two (182) are made of the same material, but the thicknesses of the main elastic rod (18), secondary elastic rod one (181), and secondary elastic rod two (182) are different.

10. A moving contact angle deflection structure for increasing contact gap without changing overtravel according to claim 8, characterized in that: The main elastic rod (18), secondary elastic rod one (181), and secondary elastic rod two (182) are made of different materials, and the elastic coefficients of the main elastic rod (18), secondary elastic rod one (181), and secondary elastic rod two (182) are different.

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