A molded case circuit breaker contact structure

Abstract

The utility model relates to the technical field of molded case circuit breaker, specifically is a molded case circuit breaker contact structure, the utility model discloses the movable contact and static contact, movable contact outer wall fixedly connected with the accommodation shell one and connecting shaft, movable contact inner wall fixedly connected with two link plates, fixed mounting has the accommodation shell two between two link plates outer wall, the inside rotatable connection of accommodation shell two has winding shaft, and the outside winding of winding shaft is provided with the protective band, and the inside rotatable connection of accommodation shell one has the winding shaft, the utility model discloses the protective band of convenient removal and replacement protection part can be set up, can shield protection to movable contact end portion, avoid abrasion, influence normal touch function, can prolong the service life of movable contact, save resources, when the resilience of reset spring is deficient, needs replacement, does not need to remove entire contact structure to complete replacement, makes the contact structure have convenient maintenance's performance.

Description

Technical Field

[0001] This utility model relates to the technical field of molded case circuit breakers, specifically a contact structure for a molded case circuit breaker. Background Technology

[0002] Molded case circuit breakers can automatically cut off the current when the current exceeds the trip setting. Molded case refers to the use of plastic insulators as the outer shell of the device to isolate conductors from grounded metal parts. Molded case circuit breakers usually contain a thermomagnetic trip unit, while larger molded case circuit breakers are equipped with solid-state trip sensors.

[0003] In the prior art, such as the moving contact structure of a molded case circuit breaker proposed in patent application number "CN202020182087.X", this utility model has the function of conducting and cutting off the circuit: through the contact between the moving contact system and the stationary contact system, it can safely and reliably connect and disconnect all currents below the short-circuit current; through the uniform distribution of springs, it can improve the stability of the contact pressure between the moving and stationary contacts, thereby achieving the purpose of effectively controlling the temperature rise of the circuit breaker and the current carrying capacity of the circuit.

[0004] In the existing technology, the contacts in a molded case circuit breaker include moving contacts and stationary contacts. When the circuit is short-circuited, the moving contact and the stationary contact come into contact and cooperate to complete the connection or disconnection of the circuit. However, the moving contact is in contact with the stationary contact for a long time, which is prone to friction damage. In order to ensure the normal operation of the contact, the entire moving contact needs to be replaced, which is not only troublesome, but also cannot extend the service life of the moving contact, resulting in a waste of resources. Utility Model Content

[0005] The purpose of this utility model is to provide a contact structure for a molded case circuit breaker to solve the problems mentioned in the background art.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A contact structure for a molded case circuit breaker includes a moving contact and a stationary contact. A first housing and a connecting shaft are fixedly connected to the outer wall of the moving contact. Two connecting plates are fixedly connected to the inner wall of the moving contact. A second housing is fixedly installed between the outer walls of the two connecting plates. A winding shaft is rotatably connected inside the second housing. A protective strip is wound around the outside of the winding shaft. A take-up shaft is rotatably connected inside the first housing. One end of the protective strip passes around one end of the moving contact and is fixedly connected to the take-up shaft. A retaining strip is fixedly connected to one end of the moving contact.

[0008] A connecting rod 1 is fixedly connected to the outer wall of the stationary contact. A connecting block is sleeved on one end of the connecting rod 1. An insert block is movably inserted inside the connecting block. Two connecting rods 2 are fixedly connected to the outer wall of the insert block. A return spring is sleeved on the outside of the two connecting rods 2.

[0009] Preferably, a knob is fixedly connected to one end of the take-up shaft, and two limiting rods are fixedly connected to the outer wall of the take-up shaft, with a locking block movably inserted into one end of each of the two limiting rods.

[0010] Preferably, a spring sheet is installed between one end of the card block and the inner wall of the limiting rod, and a plurality of card slots are opened on the inner wall of the storage shell, and the card slots fit with the card block.

[0011] Preferably, a guide shaft is fixedly installed on the inner wall of the moving contact near the corner, two fixing plates are fixedly connected to the inner wall of the moving contact, a stop is rotatably connected between the outer walls of the two fixing plates via a shaft, and two tension springs are fixedly connected to the inner wall of the moving contact, with one end of each tension spring fixedly connected to the stop via a shaft.

[0012] Preferably, a U-shaped tie rod is fixedly connected to the outer wall of the insert block, and several insertion holes are opened on the upper and lower surfaces of the insert block. A limiting post is inserted into each of the several insertion holes, and a limiting spring is installed between the bottom end of the limiting post and the inner wall of the insertion hole.

[0013] Preferably, the upper and lower inner sidewalls of the connecting block are provided with a plurality of fixing holes, and the fixing holes are matched with the limiting post. The two connecting rods are threaded with bolts inside, and one end of the two bolts is connected to a connecting head through a shaft.

[0014] The beneficial effects of this utility model are:

[0015] 1. This utility model uses a protective strip to shield and protect the end of the moving contact, preventing wear and tear that could affect normal operation and service life. The protective strip can be wound up by rotating the rewind shaft, allowing for easy movement and replacement of the protective strip at the end of the moving contact. This ensures the protective strip maintains its protective force, providing continuous and long-term protection to the end of the strip. Furthermore, the spring's rebound force causes one end of the locking block to engage with the corresponding slot, fixing the position of the limiting rod and thus the rewind shaft, ensuring the stability of the protective strip covering the end of the moving contact.

[0016] 2. In this utility model, when the return spring's rebound force is insufficient and needs to be replaced, it is not necessary to disassemble the entire contact structure. Simply remove the two bolts from the two connecting rods respectively, causing the connecting head to separate from the two. Then, by using the U-shaped pull rod, pull the insert block to pull it out of the connecting block, and move the limiting post out of the fixing hole, releasing the fixation between the insert block and the connecting block. The insert block can then be removed from the connecting block, allowing the two connecting blocks to be easily disassembled. The return springs on the two connecting blocks can then be replaced. After replacement, the two connecting blocks can be reinstalled in their original positions, making the contact structure easy to maintain. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a partial structural schematic diagram of the present invention;

[0020] Figure 3 This utility model Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a cross-sectional view of the storage shell in this utility model;

[0022] Figure 5 This is a schematic diagram of the structure of the connecting block and the insert block in this utility model;

[0023] Figure 6 This is a cross-sectional view of the connecting rod 2 and the connecting head in this utility model;

[0024] Figure 7 This is a partial structural diagram of the connecting block and the insert block in this utility model.

[0025] The attached figures are labeled as follows:

[0026] 1. Moving contact; 2. Stationary contact; 3. Connecting rod one; 4. Connecting rod two; 5. Storage shell one; 6. Connecting shaft; 7. Protective belt; 8. Guide shaft; 9. Stop block; 10. Rewinding shaft; 11. Limiting rod; 12. Locking block; 14. Connecting block; 15. Bolt; 16. Connecting head; 17. Locking strip; 18. Storage shell two; 19. Limiting post; 20. Winding shaft; 21. Return spring; 22. Insert block. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0028] A contact structure for a molded case circuit breaker, such as Figures 1-7As shown, it includes a moving contact 1 and a stationary contact 2. A storage shell 5 and a connecting shaft 6 are fixedly connected to the outer wall of the moving contact 1. Two connecting plates are fixedly connected to the inner wall of the moving contact 1. A storage shell 18 is fixedly installed between the outer walls of the two connecting plates. A winding shaft 20 is rotatably connected inside the storage shell 18. A protective strip 7 is wound around the outside of the winding shaft 20. A take-up shaft 10 is rotatably connected inside the storage shell 5. One end of the protective strip 7 passes around the moving contact 1 and is fixedly connected to the take-up shaft 10. A retaining strip 17 is fixedly connected to one end of the moving contact 1. A connecting rod 3 is fixedly connected to the outer wall of the stationary contact 2. A connecting block 14 is sleeved on one end of the connecting rod 3. An insert block 22 is movably inserted inside the connecting block 14. Two connecting rods 4 are fixedly connected to the outer wall of the insert block 22. A return spring 21 is sleeved on the outside of the two connecting rods 4.

[0029] A knob is fixedly connected to one end of the take-up shaft 10. Two limiting rods 11 are fixedly connected to the outer wall of the take-up shaft 10. A locking block 12 is movably inserted into one end of each limiting rod 11. A spring plate is installed between one end of the locking block 12 and the inner wall of the limiting rod 11. Several slots are opened on the inner wall of the storage shell 5, and the slots fit with the locking blocks 12. Under the action of the spring plate's rebound force, one end of the locking block 12 can be driven into the corresponding slot to fix the position of the limiting rod 11, thereby fixing the position of the take-up shaft 10 and ensuring the stability of the protective strip 7 covering the end of the moving contact 1.

[0030] A guide shaft 8 is fixedly installed on the inner wall of the moving contact 1 near the corner. Two fixed plates are fixedly connected to the inner wall of the moving contact 1. A stop block 9 is rotatably connected between the outer walls of the two fixed plates via a shaft. Two tension springs are fixedly connected to the inner wall of the moving contact 1, and one end of each tension spring is fixedly connected to the stop block 9 via a shaft. The tension springs, in conjunction with the stop block 9, can compress and fix the position of the protective strip 7. When the protective strip 7 moves, the stop block 9, in conjunction with the tension springs, can rotate accordingly without affecting the movement of the protective strip 7. The protective strip 7 is made of wear-resistant conductive copper metal and does not affect the conductivity between the moving contact 1 and the stationary contact 2.

[0031] In use, both the moving contact 1 and the stationary contact 2 are movably installed inside the molded case circuit breaker. The moving contact 1 is connected to the inner wall of the molded case circuit breaker via the connecting shaft 6. When a short circuit occurs, the moving contact 1 rotates via the connecting shaft 6, and one end of the moving contact 1 presses down on the stationary contact 2, causing the stationary contact 2 to rotate. The two connecting rods 1 and 2 move accordingly, and the return spring 21 deforms accordingly, causing the connector 16 to separate from the retaining strip 17, thus completing the disconnection of the line. This is the prior art and will not be described in detail.

[0032] When the circuit is disconnected, the end of the moving contact 1 comes into contact with and rubs against the stationary contact 2. The protective strip 7 can shield and protect the end of the moving contact 1, preventing wear that could affect normal operation and extend its service life. The protective strip 7 can be wound up by rotating the take-up shaft 10, allowing it to move along the end of the moving contact 1. This movement and replacement of the protective strip 7 at the end of the moving contact 1 ensures that the protective strip 7 maintains its protective force and provides continuous and long-term protection to the end of the moving contact 1. When the take-up shaft 10 is rotated, the two limit rods... 11 rotates inside the housing 5 following the winding shaft 10, causing the two locking blocks 12 to move. This causes the inclined surfaces of the two locking blocks 12 to contact the locking slots and generate displacement, allowing the locking blocks 12 to move out of the locking slots and into the limiting rod 11. The spring sheet is compressed and contracted until the rotation of the winding shaft 10 stops. Under the action of the spring sheet's rebound force, one end of the locking block 12 can be driven into the corresponding locking slot, fixing the position of the limiting rod 11, thereby fixing the position of the winding shaft 10 and ensuring the stability of the protective strip 7 covering the end of the moving contact 1.

[0033] A U-shaped tie rod is fixedly connected to the outer wall of the insert block 22. Several insertion holes are opened on the upper and lower surfaces of the insert block 22. A limiting post 19 is inserted into each of the insertion holes. A limiting spring is installed between the bottom end of the limiting post 19 and the inner wall of the insertion hole. Several fixing holes are opened on the upper and lower inner side walls of the connecting block 14, and the fixing holes fit with the limiting post 19. Bolts 15 are threaded inside the two connecting rods 24. One end of the two bolts 15 is connected to the connecting head 16 through the shaft.

[0034] Specifically, when the return spring 21 becomes insufficient due to prolonged use and needs replacement, it is not necessary to disassemble the entire contact structure. Simply rotate the connecting bolts 15 to remove them from the two connecting rods 4, causing the connecting head 16 to separate from the two connecting rods. Then, through the U-shaped pull rod, the insert block 22 is pulled out of the connecting block 14. During this process, each limiting post 19 moves along with the insert block 22, its arc surface moving along the inner wall of the fixing hole and gradually moving out and into the insertion hole. The support spring is compressed, releasing the fixation between the insert block 22 and the connecting block 14. This allows the insert block 22 to be removed from the connecting block 14, making it easy to remove the two connecting blocks 14. The return springs 21 on the two connecting blocks 14 can then be replaced. After replacement, the two connecting blocks 14 can be reinstalled in their original positions, thus providing convenient maintenance for the contact structure.

[0035] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.

Claims

1. A molded case circuit breaker contact structure comprising a movable contact (1) and a stationary contact (2), characterized in that, The outer wall of the moving contact (1) is fixedly connected to a storage shell (5) and a connecting shaft (6). The inner wall of the moving contact (1) is fixedly connected to two connecting plates. A storage shell (28) is fixedly installed between the outer walls of the two connecting plates. A winding shaft (20) is rotatably connected inside the storage shell (28). A protective strip (7) is wound around the outside of the winding shaft (20). A take-up shaft (10) is rotatably connected inside the storage shell (5). One end of the protective strip (7) passes around the moving contact (1) and is fixedly connected to the take-up shaft (10). A retaining strip (17) is fixedly connected to one end of the moving contact (1). The outer wall of the stationary contact (2) is fixedly connected to a connecting rod (3). One end of the connecting rod (3) is fitted with a connecting block (14). A plug (22) is movably inserted into the connecting block (14). Two connecting rods (4) are fixedly connected to the outer wall of the plug (22). A return spring (21) is fitted on the outside of the two connecting rods (4).

2. A molded case circuit breaker contact structure according to claim 1, wherein A knob is fixedly connected to one end of the take-up shaft (10), and two limiting rods (11) are fixedly connected to the outer wall of the take-up shaft (10). A locking block (12) is movably inserted into one end of each of the two limiting rods (11).

3. A molded case circuit breaker contact structure according to claim 2 wherein, A spring sheet is installed between one end of the card block (12) and the inner wall of the limiting rod (11). The inner wall of the storage shell (5) has several card slots, and the card slots fit with the card block (12).

4. The molded case circuit breaker contact structure of claim 1, wherein, A guide shaft (8) is fixedly installed on the inner wall of the moving contact (1) near the corner. Two fixed plates are fixedly connected to the inner wall of the moving contact (1). A stop block (9) is rotatably connected between the outer walls of the two fixed plates through a shaft. Two tension springs are fixedly connected to the inner wall of the moving contact (1), and one end of the two tension springs is fixedly connected to the stop block (9) through a shaft.

5. The molded case circuit breaker contact structure of claim 1, wherein, The outer wall of the insert (22) is fixedly connected with a U-shaped pull rod. Several insertion holes are opened on the upper and lower surfaces of the insert (22). A limiting post (19) is inserted into each of the insertion holes. A limiting spring is installed between the bottom end of the limiting post (19) and the inner wall of the insertion hole.

6. A molded case circuit breaker contact structure according to claim 5 wherein, The connecting block (14) has several fixing holes on its upper and lower inner sidewalls, and the fixing holes are matched with the limiting post (19). The two connecting rods (4) are threaded with bolts (15), and one end of the two bolts (15) is connected to a connecting head (16) through a shaft.

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