A guide rail buckle of a molded case circuit breaker

Abstract

The utility model belongs to the technical field of circuit breaker, specifically relates to a guide rail buckle of moulded case circuit breaker. Including circuit breaker body, its back portion is equipped with the guide rail groove of DIN guide rail adaptation, the guide rail groove has the upper engaging part and lower engaging part, still includes the sliding block of sliding in the back portion of circuit breaker body, the sliding block one end is equipped with the lock fixed part of cooperation with lower engaging part, and the reset groove between the guide rail groove and sliding block is set up, the fixed seat of being opposite fixed with circuit breaker body, the movable seat being linked with sliding block and the elastic reset spare connected between fixed seat and movable seat are equipped in reset groove. Sliding block pulls out and makes lock fixed part separate from lower engaging part when stretching elastic reset spare, and lock fixed part is engaged in lower engaging part after sliding block release and elastic reset spare drive sliding block back to position. The utility model realizes the two -way linkage of lock fixed part through the cooperation of sliding block, movable seat and elastic reset spare, has simplified the installation and dismounting operation, has improved locking reliability and use safety.

Description

Technical Field

[0001] This utility model belongs to the field of circuit breaker technology, specifically relating to a guide rail clip for a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers are widely used in low-voltage power distribution systems to distribute electrical energy and provide overload and short-circuit protection for lines and equipment. For ease of installation, molded case circuit breakers typically have a rail clip structure on the back that is compatible with DIN rails.

[0003] Existing DIN rail locking structures for molded case circuit breakers typically require multiple cooperating locking components on the back of the circuit breaker to achieve a releasable locking mechanism between the circuit breaker and the DIN rail. This results in a large number of parts and a cumbersome assembly process. Furthermore, when installing the circuit breaker onto the rail, one side must be pre-positioned, then the locking components must be operated to allow the other side to move, and finally the locking components must be reset after the rail is fully in place. This entire process involves numerous steps, and the locking components are prone to wear or deformation after prolonged use, leading to unreliable locking and causing the circuit breaker to loosen and potentially fall off. Therefore, there is an urgent need for a simple, easy-to-operate, and reliable DIN rail locking structure for molded case circuit breakers. Utility Model Content

[0004] This invention solves the problems mentioned in the background art by setting a movable seat connected to the slider and a fixed seat fixed relative to the circuit breaker body, and connecting an elastic reset member between the two. When the slider is pulled out, the movable seat stretches the elastic reset member to unlock it. After release, the elastic reset member drives the slider to automatically return to its original position and lock.

[0005] The technical solution of this utility model is implemented as follows: a guide rail clip for a molded case circuit breaker includes a circuit breaker body, the back of which is provided with a guide rail groove adapted to a DIN rail, the guide rail groove having an upper engaging part and a lower engaging part, and further includes: A slider is slidably disposed on the back of the circuit breaker body, and one end of the slider is provided with a locking part that cooperates with the lower engaging part; A reset groove is provided between the guide rail groove and the slider. The reset groove is provided with a fixed seat that is fixed relative to the circuit breaker body, a movable seat connected to the slider, and an elastic reset member connected between the fixed seat and the movable seat. When the slider is pulled out, it stretches the elastic reset member, causing the locking part to disengage from the lower engaging part. After the slider is released, the elastic reset member drives the slider back to its original position, causing the locking part to engage with the lower engaging part.

[0006] The present invention is further configured such that the elastic reset element is a serpentine spring.

[0007] The present invention is further configured such that first guide grooves are provided on both sides of the reset groove, and the two sides of the serpentine spring are respectively placed in the first guide grooves.

[0008] The present invention is further provided with a first anti-detachment head and a second anti-detachment head at the outer ends of the fixed seat and the movable seat, respectively, to prevent the end of the serpentine spring from detaching.

[0009] The present invention is further configured such that a second guide groove is provided in the reset groove, and the second anti-detachment head slides in cooperation with the second guide groove to constrain the sliding direction of the movable seat.

[0010] The present invention is further configured such that a limiting groove wall is provided on the side of the second guide groove away from the guide rail groove, and when the slider is pulled out to the maximum position, the second anti-detachment head abuts against the limiting groove wall.

[0011] The present invention is further configured such that the opening of the reset groove is covered with a protective cover, the protective cover is detachably connected to the back of the circuit breaker body, and the protective cover is provided with a flexible clearance portion at the position corresponding to the first anti-disengagement head and the second anti-disengagement head.

[0012] By adopting the above technical solution, the beneficial effects that this utility model can achieve are: 1. By cooperating with the fixed seat, the movable seat and the elastic reset component, the slider is driven to move in both directions between pulling out to unlock and releasing to lock, which reduces the number of parts and improves assembly efficiency and structural simplicity.

[0013] 2. By constraining both sides of the serpentine spring through the first guide groove and sliding between the second guide groove and the second anti-dislodgement head, the movable seat and slider are driven to slide smoothly along the fixed direction, which improves the accuracy of the locking part's reset and the reliability of its operation.

[0014] 3. The first and second anti-slip heads at the outer ends of the fixed and movable seats prevent the ends of the serpentine spring from coming off at both ends during reciprocating tension. At the same time, the second anti-slip head abuts against the limit groove wall when the slider is pulled out to the maximum position to limit the stroke, thereby improving durability and safety during long-term use. Attached Figure Description

[0015] Figure 1 This is an assembly diagram of the circuit breaker body and the guide rail clips; Figure 2 This is a schematic diagram of the back structure after the circuit breaker body and guide rail are assembled; Figure 3 yes Figure 2 A schematic diagram of the cross-sectional structure at point AA.

[0016] The reference numerals in the figure are as follows: 1. Circuit breaker body; 2. DIN rail; 3. Rail groove; 4. Upper locking part; 5. Lower locking part; 6. Slider; 7. Locking part; 8. Reset groove; 9. Fixed seat; 10. Movable seat; 11. Elastic reset element; 12. First guide groove; 13. First anti-disengagement head; 14. Second anti-disengagement head; 15. Second guide groove; 16. Limiting groove wall; 17. Protective cover; 18. Flexible clearance part. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. See also: Figure 1-3 : Example: This embodiment provides a DIN rail clip for a molded case circuit breaker, including a circuit breaker body 1, with a rail groove 3 on its back adapted to a DIN rail 2. The rail groove 3 has an upper engaging portion 4 and a lower engaging portion 5, and further includes: The slider 6 is slidably disposed on the back of the circuit breaker body 1, and one end of the slider 6 is provided with a locking part 7 that cooperates with the lower engaging part 5. A reset groove 8 is provided between the guide rail groove 3 and the slider 6. The reset groove 8 is provided with a fixed seat 9 that is fixed relative to the circuit breaker body 1, a movable seat 10 connected to the slider 6, and an elastic reset member 11 connected between the fixed seat 9 and the movable seat 10. When the slider 6 is pulled out, it stretches the elastic reset member 11, causing the locking part 7 to disengage from the lower engaging part 5. After the slider 6 is released, the elastic reset member 11 drives the slider 6 back to its original position, causing the locking part 7 to engage with the lower engaging part 5.

[0018] A guide rail groove 3 extending along its length is provided on the back of the circuit breaker body 1. The cross-sectional shape of the guide rail groove 3 is adapted to the cross-sectional shape of the standard DIN rail 2. An upper engaging part 4 and a lower engaging part 5 are formed at both ends of the guide rail groove 3 along its length. The upper engaging part 4 is located at the upper end of the guide rail groove 3 and is used to form a preliminary positioning engagement with the upper edge of the DIN rail 2 during installation. The lower engaging part 5 is located at the lower end of the guide rail groove 3 and is used to cooperate with the locking part 7 described later to achieve a releasable locking of the lower edge of the DIN rail 2.

[0019] A sliding groove is formed on the back of the circuit breaker body 1 and on one side of the guide rail groove 3. The sliding groove extends along the length of the circuit breaker body 1, and its extension direction is parallel to the extension direction of the guide rail groove 3. A slider 6 is embedded in the sliding groove. The outer contour of the slider 6 is adapted to the inner wall contour of the sliding groove. The slider 6 can slide back and forth along the length of the sliding groove, specifically through a sliding fit between the sliding ribs fixed on both sides of the slider 6 and the groove openings on the corresponding side walls of the sliding groove. A locking part 7 is integrally formed at the end of the slider 6 facing the guide rail groove 3. The position of the locking part 7 corresponds spatially to the lower engaging part 5 of the guide rail groove 3. When the slider 6 slides along the sliding groove towards the guide rail groove 3 to its limit position, the locking part 7 extends into the guide rail groove 3 and together with the lower engaging part 5 forms a closed engaging space, which is used to accommodate the lower edge of the DIN guide rail 2. When the slider 6 slides away from the guide rail groove 3 along the sliding groove, the locking part 7 retracts from the guide rail groove 3.

[0020] A reset groove 8 is provided on the back of the circuit breaker body 1, located between the guide rail groove 3 and the slide groove. The reset groove 8 extends along the length of the circuit breaker body 1, and its extension direction is parallel to the extension directions of the guide rail groove 3 and the slide groove. The end of the reset groove 8 facing the guide rail groove 3 is adjacent to the guide rail groove 3, and the end of the reset groove 8 away from the guide rail groove 3 is adjacent to the slide groove. When the slider 6 slides in the slide groove, the end of the slider 6 facing the guide rail groove 3 extends into the reset groove 8.

[0021] A fixing seat 9 is fixedly installed at the end of the reset groove 8 away from the guide rail groove 3. The fixing seat 9 is integrally molded with the circuit breaker body 1, that is, the fixing seat 9 is directly injection molded into the bottom of the reset groove 8 as a protruding structure on the back of the circuit breaker body 1. The fixing seat 9 extends into the reset groove 8 along its length. The main body of the fixing seat 9 is a columnar rod structure. The outer end of the rod structure, i.e., the end facing the movable seat 10, is provided with a first anti-slip head 13. The radial dimension of the first anti-slip head 13 is larger than the radial dimension of the rod structure body, forming a flange structure. The first anti-slip head 13 is used to prevent the end of the serpentine spring from slipping off the fixing seat 9.

[0022] A movable seat 10 is fixedly installed at one end of the slider 6 that extends into the reset groove 8. The movable seat 10 and the slider 6 are connected by integral molding, that is, the movable seat 10 is directly injection molded onto the end face of the slider 6 as an extension structure of the end of the slider 6. The movable seat 10 extends into the reset groove 8 along its length direction. The extension direction of the movable seat 10 is opposite to the extension direction of the fixed seat 9. That is, the fixed seat 9 extends into the reset groove 8 from the end away from the guide rail groove 3, and the movable seat 10 extends into the reset groove 8 from the end facing the guide rail groove 3 through the drive of the slider 6. The two are arranged facing each other. The main body of the movable seat 10 is a columnar rod structure. A second anti-slip head 14 is provided at the outer end of the rod structure, that is, the end facing the fixed seat 9. The radial dimension of the second anti-slip head 14 is larger than the radial dimension of the main body of the movable seat 10 rod structure. The second anti-slip head 14 is used to prevent the end of the serpentine spring from slipping off the movable seat 10.

[0023] The serpentine spring has a wave-shaped, curved strip structure, formed by stamping and bending a spring steel strip to create multiple continuous peaks and troughs. One end of the serpentine spring facing the guide rail groove 3 is fitted onto the rod structure of the movable seat 10. This end of the serpentine spring is limited by the second anti-detachment head 14 of the movable seat 10 to prevent it from axially detaching from the movable seat 10. The other end of the serpentine spring, away from the guide rail groove 3, is fitted onto the rod structure of the fixed seat 9. This end of the serpentine spring is limited by the first anti-detachment head 13 of the fixed seat 9 to prevent it from axially detaching from the fixed seat 9. The serpentine spring is fitted onto both ends via hooks integrally formed at both ends. The serpentine spring is freely mounted between the fixed seat 9 and the movable seat 10 via the hooks at both ends. When the slider 6 is not subjected to external force, the serpentine spring, relying on its own elastic force, pushes the movable seat 10 and the connected slider 6 towards the guide rail groove 3, keeping the locking part 7 engaged with the lower engaging part 5.

[0024] A first guide groove 12 is formed on each of the two opposing inner sidewalls of the reset groove 8. The two first guide grooves 12 extend along the length direction of the reset groove 8, and their positions correspond to those of the reset groove 8 in the width direction. The two side edges of the serpentine spring are respectively embedded in the two first guide grooves 12. The width of the first guide groove 12 is adapted to the thickness of the steel strip of the serpentine spring. The side edges of the serpentine spring can slide within the first guide groove 12 but cannot deviate in the width direction of the reset groove 8. The extension direction of the first guide groove 12 is consistent with the length direction of the reset groove 8, that is, consistent with the stretching direction of the serpentine spring, to ensure that the serpentine spring always moves along the axial direction of the fixed seat 9, that is, the length direction of the reset groove 8, during the stretching or reset process.

[0025] A second guide groove 15 is provided in the section of the reset groove 8 facing the guide rail groove 3. The second guide groove 15 extends along the length direction of the reset groove 8, and its extension direction is consistent with the length direction of the reset groove 8. A second anti-detachment head 14 is embedded in the second guide groove 15, and the outer contour of the second anti-detachment head 14 is adapted to the inner wall contour of the second guide groove 15. The second anti-detachment head 14 can slide back and forth along the length direction of the second guide groove 15. The cooperation between the second anti-detachment head 14 and the second guide groove 15 ensures that the movable seat 10 and the slider 6 connected to it can only move along the extension direction of the second guide groove 15, that is, the length direction of the reset groove 8. When the slider 6 is pulled outward, the second anti-detachment head 14 slides in the second guide groove 15 in a direction away from the guide rail groove 3; when the slider 6 is released, the second anti-detachment head 14 slides back to its original position in the second guide groove 15 towards the guide rail groove 3.

[0026] At the end of the second guide groove 15 opposite to the guide rail groove 3, a limiting groove wall 16 is formed. The limiting groove wall 16 is the closed end wall of the second guide groove 15 at this end, and its extension direction is perpendicular to the length direction of the second guide groove 15. When the slider 6 is pulled outward to the maximum stroke position, the end face of the second anti-detachment head 14 opposite to the guide rail groove 3 abuts against the end face of the limiting groove wall 16 facing the guide rail groove 3. The limiting groove wall 16 limits the maximum pull-out stroke of the slider 6 by preventing the second anti-detachment head 14 from continuing to move in the direction opposite to the guide rail groove 3.

[0027] A protective cover 17 covers the opening of the reset slot 8 facing the outer back of the circuit breaker body 1. The protective cover 17 covers the opening of the reset slot 8 to prevent external debris from entering the interior of the reset slot 8. The edge of the protective cover 17 is provided with a snap-fit ​​structure, and the edge of the opening of the reset slot 8 is provided with a corresponding snap-fit ​​structure. The snap-fit ​​is inserted into the snap-fit ​​to achieve a detachable connection between the protective cover 17 and the back of the circuit breaker body 1. The protective cover 17 is provided with a flexible clearance portion 18 at the position corresponding to the first anti-disengagement head 13 of the fixed seat 9 and the second anti-disengagement head 14 of the movable seat 10. The flexible clearance portion 18 is an opening on the solid part of the protective cover 17 corresponding to the position of the first anti-disengagement head 13 and the second anti-disengagement head 14, and a silicone film is covered at the opening. When the fixed seat 9 and the movable seat 10 are relatively displaced along the length direction in the reset slot 8, the first anti-disengagement head 13 and the second anti-disengagement head 14 pass through the flexible clearance portion 18, and the flexible clearance portion 18 undergoes local elastic deformation to make clearance. After the anti-detachment head is reset, the flexible relief part 18 returns to its original shape by its own elasticity.

[0028] The slider 6 has a finger groove on its outer surface that is exposed on the back of the circuit breaker body 1. The finger groove is an inwardly recessed arc-shaped groove structure with its concave direction facing the inside of the slider 6. The operator inserts his finger into the finger groove and applies force to the finger groove to pull the slider 6 to slide along the groove.

[0029] The working principle of this utility model will be explained below.

[0030] Under normal conditions, when no external force is applied, the serpentine spring is in its free length state. It uses its own elastic restoring force to push the movable seat 10 and the slider 6 fixedly connected to it toward the guide rail groove 3. At this time, the locking part 7 on the slider 6 extends into the guide rail groove 3 and is opposite to the lower locking part 5, and a locking engagement is formed between the locking part 7 and the lower locking part 5.

[0031] When installing the circuit breaker onto the DIN rail 2, first insert the upper edge of the DIN rail 2 into the upper engaging part 4 of the rail groove 3. Then, the operator inserts their fingers into the finger groove on the slider 6 and pulls the slider 6 in a direction away from the rail groove 3. The slider 6 slides backward within the groove, causing the connected movable seat 10 to move backward synchronously. During the backward movement of the movable seat 10, the sliding engagement between the second anti-disengagement head 14 and the second guide groove 15 maintains a linear motion direction. Simultaneously, the backward movement of the movable seat 10 causes the end of the serpentine spring facing the movable seat 10 to move backward, stretching the serpentine spring between the fixed seat 9 and the movable seat 10. This increases the distance between the crests and troughs of the serpentine spring, storing elastic potential energy within the spring. As the slider 6 moves backward, the locking part 7 at the end of the slider 6 disengages from the rail groove 3 along with the slider 6, causing the lower engaging part 5 to be in a yielding state. At this point, the lower edge of the DIN rail 2 is inserted into the area of ​​the lower engaging part 5 at the lower end of the rail groove 3. The operator then releases the slider 6, causing the serpentine spring to release its stored elastic potential energy. The elastic restoring force pulls the movable seat 10 and the connected slider 6 back to their original position in the rail groove 3. After the slider 6 returns to its original position, the locking part 7 extends back into the rail groove 3, working together with the lower engaging part 5 to lock and fix the lower edge of the DIN rail 2, completing the circuit breaker installation.

[0032] When it is necessary to remove the circuit breaker from the DIN rail 2, the operator inserts their fingers into the finger slot again and pulls the slider 6 in the direction away from the guide rail groove 3. The slider 6 moves backward, causing the movable seat 10 to move backward, stretching the serpentine spring and causing the locking part 7 to disengage from the guide rail groove 3, releasing the locking part 7 from the lower locking part 5. At this time, the lower edge of the DIN rail 2 is removed from the lower locking part 5, and then the upper edge of the DIN rail 2 is removed from the upper locking part 4, completing the removal of the circuit breaker. During the process of pulling out the slider 6, when the slider 6 is pulled to the maximum stroke position, the second anti-disengagement head 14 on the movable seat 10 abuts against the limiting groove wall 16 at the end of the second guide groove 15, preventing the slider 6 from moving further backward. After the operator releases the slider 6, the serpentine spring automatically drives the slider 6 to return to the locked position.

[0033] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of protection of the present utility model. Therefore, all equivalent changes made to the structure, shape, and principle of the present utility model should be covered within the scope of protection of the present utility model.

Claims

1. A guide rail latch for a molded case circuit breaker, comprising a circuit breaker body (1), the back of which is provided with a guide rail groove (3) adapted to a DIN rail (2), the guide rail groove (3) having an upper engaging portion (4) and a lower engaging portion (5), characterized in that, Also includes: The slider (6) is slidably disposed on the back of the circuit breaker body (1), and one end of the slider (6) is provided with a locking part (7) that cooperates with the lower locking part (5). A reset groove (8) is provided between the guide rail groove (3) and the slider (6). The reset groove (8) is provided with a fixed seat (9) that is fixed relative to the circuit breaker body (1), a movable seat (10) connected to the slider (6), and an elastic reset member (11) connected between the fixed seat (9) and the movable seat (10). When the slider (6) is pulled out, it stretches the elastic reset member (11) so that the locking part (7) disengages from the lower engaging part (5). After the slider (6) is released, the elastic reset member (11) drives the slider (6) back to its original position so that the locking part (7) engages with the lower engaging part (5).

2. The guide rail clip for a molded case circuit breaker according to claim 1, characterized in that, The elastic reset element (11) is a serpentine spring.

3. The guide rail clip for a molded case circuit breaker according to claim 2, characterized in that, The reset groove (8) has a first guide groove (12) on both sides, and the two sides of the serpentine spring are respectively placed in the first guide groove (12).

4. The guide rail clip for a molded case circuit breaker according to claim 2, characterized in that, The outer ends of the fixed seat (9) and the movable seat (10) are respectively provided with a first anti-detachment head (13) and a second anti-detachment head (14) to prevent the end of the serpentine spring from detaching.

5. The guide rail clip for a molded case circuit breaker according to claim 4, characterized in that, The reset groove (8) is further provided with a second guide groove (15), and the second anti-detachment head (14) slides in cooperation with the second guide groove (15) to constrain the sliding direction of the movable seat (10).

6. The guide rail clip for a molded case circuit breaker according to claim 5, characterized in that, The second guide groove (15) is provided with a limiting groove wall (16) on the side away from the guide rail groove (3). When the slider (6) is pulled out to the maximum position, the second anti-detachment head (14) abuts against the limiting groove wall (16).

7. The guide rail clip for a molded case circuit breaker according to claim 4, characterized in that, The opening of the reset slot (8) is covered by a protective cover (17), which is detachably connected to the back of the circuit breaker body (1). The protective cover (17) has a flexible clearance part (18) at the position corresponding to the first anti-disengagement head (13) and the second anti-disengagement head (14).

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