A circuit breaker trip unit and trip mechanism employing the same

Abstract

The utility model relates to a circuit breaker release and release mechanism adopting the release, and the release includes first fastener, second fastener, a connecting shaft is worn first fastener, second fastener and is rotationally connected, the second shaft hole on second fastener can form locking position or unlocking position with the translation of connecting shaft, and the first fastener is connected with the second fastener and has the tension spring. The release mechanism further includes the linkage that is connected with the connecting shaft, and the linkage is equipped with the limiting slot, and the second connecting shaft is connected on the connecting hole of the second fastener of release. The first fastener and second fastener of release are mutually buckled and are connected, and the second connecting shaft is limited in the limiting slot, or after the first fastener and second fastener are released by external force, the second fastener translates relative to the first fastener, and the second connecting shaft is separated from the limiting slot. The utility model release mechanism, reasonable structure, can open the shutter rapidly, and stable performance.

Description

Technical Field

[0001] This utility model relates to a trip unit and tripping mechanism for a circuit breaker used to protect circuits in a power distribution device. Background Technology

[0002] Circuit breakers are primarily used to protect circuits, such as against leakage current, overload, or short circuits, and are an indispensable component of power distribution equipment. They mainly rely on moving contacts to connect or disconnect stationary contacts to achieve switching. In existing technologies, this can be achieved through manual opening and closing, or through intelligent control via signals. The response speed of opening and closing is crucial; the faster the opening speed, the less electric arc, and the safer the circuit.

[0003] The tripping mechanism is a crucial component in the opening and closing mechanism. The performance of the trip unit determines the performance of the tripping mechanism. It must be able to react quickly and trip rapidly to enable rapid circuit breaking, while also being protected from external interference such as vibration to avoid accidental tripping, and ensuring the stability of its structure after long-term use. Summary of the Invention

[0004] In order to overcome the shortcomings of the existing technology in that the tripping speed is not fast enough, this utility model provides a circuit breaker trip unit that can quickly disconnect and a tripping mechanism using the trip unit.

[0005] This utility model is achieved through the following technical solution: A circuit breaker tripping device includes a first fastener and a second fastener. The first fastener has a first shaft hole, and one end of the second fastener has a second shaft hole. A connecting shaft passes through the first shaft hole and the second shaft hole and is rotatably connected. The second shaft hole can be translated relative to the connecting shaft to form a locked position or an unlocked position. The other end of the second fastener has a connecting hole. A tension spring is connected between the first fastener and the second fastener. The first fastener and the second fastener are fastened together. The connecting shaft is in the locked position of the second shaft hole, or after the first fastener and the second fastener are disengaged by external force, the second fastener translates so that the connecting shaft is in the unlocked position of the second shaft hole.

[0006] Preferably, the first fastener is configured as a double-layer structure, with the two layers connected as one unit by a connecting piece. The second fastener is located inside the double-layer structure of the first fastener, and the connecting piece forms a fastening part. The second fastener has a fastening groove for engaging the fastening part. Preferably, the inner surface of the connecting piece is in contact with the wall of the buckle groove, and the inner surface of the connecting piece is provided with a groove that is not exposed at the top of the buckle groove wall.

[0007] Preferably, the first shaft hole on the double-layer structure of the first fastener is formed as a flange from the outside to the inside.

[0008] Preferably, the fastening part of the first fastener and the fastening groove of the second fastener are respectively provided with a first hook and a second hook on their opposite outer sides. The tension spring is provided between the first hook and the second hook. The double-layer structure of the first fastener includes a first side piece and a second side piece. The first hook is provided on the first side piece, and a groove is opened on one side of the first hook. The second side piece is provided with a support edge facing the first side piece corresponding to the position of the first hook. A locking foot is protruding on one side of the support edge. The edge of the support edge abuts against the first hook, and its locking foot is locked in the groove.

[0009] Preferably, the second shaft hole is a strip-shaped hole, with the side of the strip-shaped hole closer to the connecting hole being the locked position and the side of the strip-shaped hole farther from the connecting hole being the unlocked position.

[0010] A circuit breaker tripping mechanism employs the aforementioned tripping device. A linkage component is also connected to the connecting shaft of the tripping device. The linkage component has an arc-shaped sidewall, and a limiting groove is formed at the bottom of the arc-shaped sidewall towards the connecting shaft. A second connecting shaft is connected to the connecting hole of the second fastener of the tripping device, and a moving rod is simultaneously connected to the second connecting shaft. The first and second fasteners of the tripping device are interlocked, and the second connecting shaft is confined within the limiting groove. The connecting shaft is in the locked position of the second shaft hole. Alternatively, after external force causes the first and second fasteners to disengage, the second connecting shaft disengages from the limiting groove, and the connecting shaft is in the unlocked position of the second shaft hole.

[0011] Preferably, the linkage is connected to an operating panel via a connecting rod, and the operating panel pushes and pulls the linkage. The moving rod is connected to a moving contact via a moving rod drive mechanism, and the moving rod drive mechanism drives the moving rod to disengage from the limiting groove at an angle upward.

[0012] Preferably, the outer sides of the linkage are respectively connected by a connecting shaft to a first driving block and a second driving block. The first driving block and the second driving block are respectively provided with driving block tails. The first fastener and the fastening part are provided with fastener tails in different directions. The driving block tails are respectively located on the outer sides of the fastener tails, and a column is connected between the two driving block tails and the fastener tails are passed through.

[0013] Preferably, the linkage is configured as a double-layer structure, and the trip unit is located within the double-layer structure of the linkage.

[0014] The beneficial effects of this utility model are as follows: In this utility model trip device, the first fastener and the second fastener can rotate relative to each other. When they are fastened, they are kept in the fastened state by a tension spring. After the external force is applied, the first fastener deflects at a certain angle and quickly trips, and the second fastener is displaced so that the circuit breaker can be quickly tripped. The structure is reasonable and the tripping is rapid.

[0015] This utility model's tripping mechanism, when the trip unit is engaged, ensures that the second connecting shaft is confined within the limiting groove. After tripping, the second fastener is released, allowing the second connecting shaft to disengage from the limiting groove, thereby achieving rapid circuit breaker opening. This utility model has a reasonable structure, can quickly open circuits, and has stable performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the trip unit of this utility model.

[0017] Figure 2 yes Figure 1 A schematic diagram of the explosion structure.

[0018] Figure 3 This is a structural schematic diagram of the first fastener of this utility model.

[0019] Figure 4 yes Figure 1 A cross-sectional structural diagram.

[0020] Figure 5 This is a schematic diagram of the release mechanism of this utility model.

[0021] Figure 6 This is a schematic diagram of the working principle of the release mechanism of this utility model.

[0022] Figure 7 This is a schematic diagram of the circuit breaker in the closed state.

[0023] Figure 8 This is a schematic diagram of the circuit breaker in the open state.

[0024] Figure 9 This is a schematic diagram of the circuit breaker in the ready state after tripping. Detailed Implementation

[0025] The utility model will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0026] like Figure 1-4As shown, a circuit breaker trip unit 10 includes a first fastener 1 and a second fastener 3. The first fastener has a first shaft hole 14, and one end of the second fastener has a second shaft hole 31. A connecting shaft 2 passes through the first shaft hole and the second shaft hole and is rotatably connected. A tension spring 4 connects the first fastener and the second fastener. The first fastener 1 has a double-layer structure, with the two layers connected as one unit by a connecting piece 18. That is, the double-layer structure is formed by bending the two ends of the connecting piece relative to each other. The second fastener is located within the double-layer structure of the first fastener. The connecting piece 18 forms a fastening part 12, and the second fastener has a fastening groove 32 that mates with the fastening part. The first fastener has a fastener tail 11 in a different direction from the fastening part 12. The other end of the second fastener has a connecting hole 34, and the second shaft hole 31 can be translated relative to the connecting shaft 2 to form a locked position or an unlocked position. In this embodiment, the second shaft hole 31 is a strip-shaped hole. The side of the strip-shaped hole closer to the connecting hole is the locked position 3412, and the side of the strip-shaped hole farther from the connecting hole is the unlocked position 311. When the first fastener and the second fastener are engaged and held in the engaged state by the tension spring 4, the connecting shaft 2 is in the locked position 312 of the second shaft hole. Alternatively, when an external force causes the first fastener to disengage from the second fastener, the second fastener moves so that the connecting shaft is in the unlocked position 311 of the second shaft hole. When an external force is applied to the tail 11 of the first fastener 1, the first fastener deflects around the connecting shaft 2 to a certain extent, and the first fastener 1 disengages relative to the second fastener 3, thereby causing relative movement of the second fastener, which facilitates the subsequent tripping of the circuit breaker.

[0027] like Figure 4 As shown, when the first fastener and the second fastener are fastened together, the inner surface 182 of the connecting piece contacts the fastening groove wall 321 of the fastening groove. The inner surface of the connecting piece has a groove 181 that avoids the top of the fastening groove wall 321. When disengaging, external force will cause the fastening part 12 of the first fastener to rotate at a certain angle, thereby disengaging. Without the groove, when the fastening part disengages from the fastening groove, the top of the fastening groove wall 321 will abut against the inner surface of the connecting piece 18, and the inner surface 182 of the connecting piece 18 will slide off along the top of the fastening groove wall 321. This will cause severe wear on the top, and the point-contact sliding will result in unstable performance, and even a slight vibration may cause accidental disengagement. However, with the groove 181 provided to avoid the top, the inner surface 182 of the connecting piece slides off along the fastening groove wall 321, which is a surface sliding disengagement. This will not cause wear on the top of the fastening groove wall, and the overall performance will be more stable. It will also allow for rapid disengagement after a certain external force is applied.

[0028] like Figure 3As shown, the first shaft holes 14 on the double-layer structure of the first fastener are formed as flanged holes from the outside to the inside. The edges of the flanged holes are smoother, and the protruding flanges reduce the gap between the double-layer structures, thus limiting the position of the second fastener located within the double-layer structure of the first fastener. The contact surface between the first shaft hole 14 and the connecting shaft 2 is larger, and the distance between the forces exerted by the two first bearing holes on the connecting shaft is also reduced, making the connecting shaft structure more robust and less prone to breakage.

[0029] The first fastener has a first hook 13 and a second hook 33 on opposite outer sides of its engaging part 12 and its groove 32, respectively. A tension spring 4 is located between the first hook and the second hook, and the tension spring can drive the first fastener and the second fastener to engage. When there is no external force, it keeps them stably engaged. The double-layer structure of the first fastener includes a first side piece and a second side piece. The first hook 13 is located on the first side piece, and a groove 15 is opened on one side of the first hook. The second side piece has a supporting edge 16 facing the first side piece corresponding to the position of the first hook. A locking foot 17 protrudes from one side of the supporting edge. The edge of the supporting edge 16 abuts against the first hook 13, and its locking foot 17 is engaged in the groove 15. The edge of the supporting edge abuts against the first hook, and the locking foot engages in the groove, maintaining the stability of the double-layer structure of the first fastener from different directions.

[0030] like Figure 2 As shown, the second shaft hole 31 is a strip-shaped hole. The side of the strip-shaped hole closer to the connecting hole is the locking position 312, and the side of the strip-shaped hole farther from the connecting hole is the unlocking position 311. The second shaft hole of the strip-shaped hole allows the second fastener to have a certain amount of movement in the fastened and unfastened states, thereby ensuring that the second connecting shaft disengages from the limiting groove and subsequent series of actions.

[0031] like Figure 5-9 As shown, a circuit breaker tripping mechanism is disposed within the circuit breaker housing. Besides the aforementioned trip unit 10, it also includes a linkage 5. The linkage has a double-layer structure, with the trip unit 10 housed within this structure. The connecting shaft 2 of the trip unit passes through and rotatably connects to the linkage 5. The linkage has an arc-shaped sidewall 51, with a limiting groove 52 recessed at the bottom of the arc-shaped sidewall towards the connecting shaft. An inclined wall 53 extends outward from the outer side of the limiting groove. A second connecting shaft 6 passes through the connecting hole 34 of the second fastener. In the engaged state, the second connecting shaft 6 is located within the limiting groove 52. Simultaneously, a moving rod 8 passes through the second connecting shaft. The lower end of the moving rod 8 is connected to a moving contact via a moving rod drive mechanism. The moving rod drive mechanism drives the moving rod obliquely upward, causing the second connecting shaft 6 to disengage from the limiting groove 52, generating an obliquely upward thrust on the second fastener through the second connecting shaft.

[0032] The linkage is connected to the operating panel 7 via a connecting rod 71. The operating panel pushes and pulls the linkage. The operating panel is equipped with an operating handle 72. Rotating the operating panel drives the connecting rod to pull the linkage up and down. When the circuit breaker is in the connected state, the linkage is subjected to a downward force from the operating panel, keeping the moving contact in contact with the stationary contact.

[0033] The downward force is transmitted to the second connecting shaft 6 through the limiting groove 52. The limiting groove limits the second connecting shaft 6 so that it cannot move upward. When the second connecting shaft is released from the limiting groove, the inclined wall 53 can be limited to the inside of the inclined wall and slide along the arc-shaped side wall, or facilitate the reset of the second connecting shaft 6.

[0034] The first fastener 1 and the second fastener 3 of the trip unit are fastened together. The second connecting shaft 6 is limited in the limiting groove 52. The connecting shaft 2 is located in the locking position 312 of the second shaft hole. Alternatively, after the first fastener and the second fastener are disengaged by external force, the second connecting shaft is disengaged from the limiting groove 52 and the connecting shaft is located in the unlocking position 311 of the second shaft hole.

[0035] When the fastening part 12 is engaged with the fastening groove 32, the first fastener 1 and the second fastener 3 are relatively close together, exerting an inward pulling force on the second connecting shaft 6. The second connecting shaft is confined within the limiting groove 52, and the connecting shaft 2 is in the locking position 312 of the second shaft hole. The second connecting shaft 6 is blocked by the upper sidewall of the limiting groove and cannot move upward. When an external force causes the fastening part to disengage from the fastening groove, the second fastener 3 moves relative to the connecting shaft 2. Due to the upward force, the second fastener 3 moves away from the connecting shaft and outward. The second connecting shaft 6 disengages from the limiting groove 52 and moves outward. The connecting shaft is then in the unlocking position 311 of the second shaft hole. The second connecting shaft 6 is no longer blocked by the upper sidewall of the limiting groove 52 and slides upward along the arc-shaped sidewall 51 of the linkage. Here, the performance of the trip unit affects the tripping response speed. It must ensure the fastening capability so that the second connecting shaft is confined within the limiting groove, and it must be able to respond quickly once a certain force is applied externally.

[0036] The outer sides of the linkage are respectively connected by connecting shafts to a first driving block 61 and a second driving block 62. The first driving block and the second driving block are respectively provided with driving block tails. The first fastener and the fastening part are provided with fastener tails 11 in different directions. The driving block tails are respectively located on the outer sides of the fastener tails, and the two driving block tails are connected by a column 63, which passes through the fastener tail 11. The deflection of the first driving block 61 and the second driving block 62 can drive the driving block tails to deflect through the column 63.

[0037] The first drive block 61 and the second drive block 62 are respectively equipped with corresponding striking rods 9 on their outer sides. The first drive block and the second drive block are mainly used to receive different external forces. When there is a short circuit or overload, the metal sheet deforms due to heat and pushes the first drive block 61 to move through the connecting mechanism. When there is a leakage current, the motor receives a signal and drives the operating panel to rotate, which pushes the second drive block 62 to move through the connecting mechanism. The working principle of these short circuit, overload, and leakage current is the same as that of other circuit breakers, and will not be described in detail here. The final result is that the first drive block or the second drive block is deflected along the connecting shaft 2 by the striking rods 9 respectively. After the first drive block and the second drive block swing, they drive the tail 11 of the fastener connected through the column 63 to rotate, and the fastening part 12 of the first fastener deflects and disengages from the second fastener.

[0038] In this embodiment, the connecting shaft sequentially passes through the first drive block 61, the linkage 5, the trip unit 10, and the second drive block 62. The second connecting shaft 6 passes through the connecting rod 8 and the second fastener 3 of the trip unit. The connecting shaft 2 is fixed inside the housing, and the components passing through it can rotate around it. The second connecting shaft 6 can swing inside the housing.

[0039] The specific tripping process in this embodiment is as follows.

[0040] In the normal closed-circuit working state, the first fastening part 12 of the trip unit is fastened to the fastening groove 32 of the second fastening part, and the first fastening part and the second fastening part are connected by a tension spring 4, so that the two are stable in the fastened state. The second connecting shaft 6 is subjected to an inward pulling force and is limited in the limiting groove 52. The connecting shaft 2 is located in the locking position 312 of the strip hole. Although the moving rod drive mechanism on the moving rod 8 drives it upward, the second connecting shaft 6 is limited in the limiting groove 52. The operating panel 7 exerts a downward force on the linkage as a whole, and the side wall of the limiting groove also exerts a downward force on the second connecting shaft 6. All of these cooperate with each other to keep the moving rod 8 in the pressed state, that is, the moving contact and the stationary contact are kept in contact and connected.

[0041] When a sudden event occurs, such as a short circuit or overload, the metal sheet deforms due to heat, which ultimately transmits the signal to the corresponding striking rod 9, striking the first drive block 61. In the event of a leakage, the motor drives the operating panel 7 to rotate, which ultimately transmits the signal to the corresponding striking rod 9, striking the second drive block 62. Different striking rods act on either the first or second drive block. Regardless of which drive block it is, the column 63 drives the tail 11 of the first fastener to rotate, causing the fastening part 12 of the first fastener to instantly and quickly disengage from the fastening groove 32 of the second fastener. During the disengagement process, the inner surface 182 of the connecting piece of the fastening part slides along the wall 321 of the fastening groove to disengage. This sliding disengagement does not cause wear on the top of the fastening groove wall, and the overall performance is stable.

[0042] After disengagement, the second fastener 3, driven by the moving rod mechanism, moves outward away from the connecting shaft. The connecting shaft then changes from its locked position 312 to its unlocked position 311 within the slot. The second fastener drives the second connecting shaft 6 away from the limiting groove 52, no longer contacting the upper side wall of the limiting groove, thus releasing it. The moving rod continues to move upward under the action of the moving rod mechanism. Since the second fastener is still restricted by the connecting shaft 2, the second connecting shaft 6 moves along the arc-shaped wall 51 of the linkage, separating the moving contact from the stationary contact, achieving disconnection. During the movement of the second connecting shaft, the second fastener simultaneously drives the first fastener, the first driving block, and the second driving block to rotate until the moving contact and the stationary contact are completely disconnected. The second connecting shaft is located outside the limiting groove, and the trip unit is in the disengaged state.

[0043] To facilitate the next reset, preparatory actions are required after disconnection. By electrically or manually driving the operating panel upwards, the operating panel 7 pulls the driving component 5 upwards via the connecting rod 71. This causes the limiting groove 52 to engage the second connecting shaft 6, pushing the second fastener towards the connecting shaft 2. The first and second fasteners then interlock. When closing the circuit breaker is required, the operating panel is rotated manually or intelligently. The operating panel then depresses, and through the limiting groove 52 and the second connecting shaft 6, the moving rod overcomes the force of the moving rod drive mechanism and presses down on the moving contact, making it contact the stationary contact.

[0044] The trip unit of this utility model has a reasonable structure, stable performance, long service life, and fast tripping speed. The tripping mechanism of this trip unit has a fast opening speed and is stable and reliable.

Claims

1. A circuit breaker trip unit, characterized in that: The device includes a first fastener and a second fastener. The first fastener has a first shaft hole, and one end of the second fastener has a second shaft hole. A connecting shaft passes through the first shaft hole and the second shaft hole and is rotatably connected. The second shaft hole can be translated relative to the connecting shaft to form a locked position or an unlocked position. The other end of the second fastener has a connecting hole. A tension spring connects the first fastener and the second fastener. The first fastener and the second fastener are fastened together. The connecting shaft is in the locked position of the second shaft hole. Alternatively, if an external force causes the first fastener and the second fastener to disengage, the second fastener will translate so that the connecting shaft is in the unlocked position of the second shaft hole.

2. The circuit breaker trip unit according to claim 1, characterized in that: The first fastener is designed with a double-layer structure, and the two layers are connected as one unit by a connecting piece. The second fastener is located inside the double-layer structure of the first fastener. The connecting piece forms a fastening part, and the second fastener has a fastening groove for engaging the fastening part.

3. The circuit breaker trip unit according to claim 2, characterized in that: The inner surface of the connecting piece is in contact with the wall of the buckle groove, and the inner surface of the connecting piece is provided with a groove that is not exposed at the top of the buckle groove wall.

4. The circuit breaker trip unit according to claim 2, characterized in that: The first shaft hole on the double-layer structure of the first fastener is formed as a flip hole from the outside to the inside.

5. The circuit breaker trip unit according to claim 2, characterized in that: The first fastener has a first hook and a second hook respectively on the outer side of the fastening part of the first fastener and the fastening groove of the second fastener. The tension spring is located between the first hook and the second hook. The double-layer structure of the first fastener includes a first side piece and a second side piece. The first hook is located on the first side piece, and a groove is opened on one side of the first hook. The second side piece is provided with a support edge facing the first side piece corresponding to the position of the first hook. A locking foot is protruding on one side of the support edge. The edge of the support edge abuts against the first hook, and its locking foot is locked in the groove.

6. The circuit breaker trip unit according to any one of claims 1 to 5, characterized in that: The second shaft hole is a strip-shaped hole. The side of the strip-shaped hole closer to the connecting hole is the locked position, and the side of the strip-shaped hole farther away from the connecting hole is the unlocked position.

7. A circuit breaker tripping mechanism, characterized in that: The trip unit includes any one of claims 1 to 6, wherein the connecting shaft of the trip unit is further connected to a linkage member, the linkage member has an arc-shaped sidewall, the bottom of the arc-shaped sidewall is recessed towards the connecting shaft to form a limiting groove, the connecting hole of the second fastener of the trip unit is connected to a second connecting shaft, and the second connecting shaft is simultaneously connected to a moving rod, the first fastener and the second fastener of the trip unit are engaged with each other, the second connecting shaft is limited in the limiting groove, the connecting shaft is in the locked position of the second shaft hole, or after the first fastener and the second fastener are disengaged by external force, the second connecting shaft is disengaged from the limiting groove, and the connecting shaft is in the unlocked position of the second shaft hole.

8. A circuit breaker tripping mechanism according to claim 7, characterized in that: The linkage is connected to the operating panel via a connecting rod. The operating panel pushes and pulls the linkage. The moving rod is connected to the moving contact via a moving rod drive mechanism. The moving rod drive mechanism drives the moving rod to move obliquely upward away from the limiting groove.

9. A circuit breaker tripping mechanism according to claim 7, characterized in that: The outer sides of the linkage are respectively connected by a connecting shaft to a first driving block and a second driving block. The first driving block and the second driving block are respectively provided with driving block tails. The first fastener and the fastening part are provided with fastener tails in different directions. The driving block tails are respectively located on the outer sides of the fastener tails, and the two driving block tails are connected by a column and the fastener tails are passed through it.

10. A circuit breaker tripping mechanism according to any one of claims 7 to 9, characterized in that: The linkage component is configured with a double-layer structure, and the trip unit is located within the double-layer structure of the linkage component.

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