Molded case circuit breaker

Abstract

The utility model discloses a molded case circuit breaker, which comprises a base with an accommodating cavity, and terminal cavities are arranged at two ends of the base; the operating mechanism is arranged in the containing cavity and used for controlling connection and disconnection of a circuit connected with the molded case circuit breaker, conducting bars are arranged at the two ends of the operating mechanism, and one end of each conducting bar is arranged in the terminal cavity and used for being connected with an external circuit; and the fixing device is detachably arranged in the terminal cavity and is used for being matched with a threaded fastener to connect a cable, and the fixing device comprises a connecting seat and a threaded gasket arranged on the connecting seat. Due to the introduction of the retaining assembly, the connecting seat is effectively prevented from being ejected out by external force in the mounting process. The limiting arm is tightly matched with the limiting groove and the groove, and the elastic piece supports the limiting arm, so that a stable anti-retreating mechanism is formed, the connecting seat can be ensured to be stable and not loose even under the impact of vibration or external force, and the reliability of circuit connection is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, and particularly relates to a molded case circuit breaker. Background Art

[0002] In the power system, as a key protection and control component, the molded case circuit breaker is widely used in low-voltage distribution networks to quickly cut off the power supply when faults such as overload and short circuit occur in the circuit, so as to protect electrical equipment and personal safety. When connecting external lines, traditional molded case circuit breakers often use the method of directly fastening with bolts. Although this method is simple, there are many inconveniences in the installation and maintenance processes, such as low installation efficiency, easy loosening, and great damage to the cables. In addition, traditional fixing devices often lack an effective anti-loosening mechanism. Under the action of vibration or external force, the connecting seat may become loose or even fall off, affecting the normal operation of the circuit breaker and the safety of the circuit. Summary of the Utility Model

[0003] (1) Technical Problems to be Solved

[0004] To solve the above problems, the utility model provides a molded case circuit breaker, aiming to solve the problem that traditional fixing devices often lack an effective anti-loosening mechanism. Under the action of vibration or external force, the connecting seat may become loose or even fall off, affecting the normal operation of the circuit breaker and the safety of the circuit.

[0005] (2) Technical Solutions

[0006] A molded case circuit breaker of the utility model, the molded case circuit breaker includes:

[0007] A base with a cavity, and terminal cavities are provided at both ends of the base;

[0008] An operating mechanism, which is arranged in the cavity and is used to control the on-off of the circuit connecting the molded case circuit breaker. Conductive bars are provided at both ends of the operating mechanism, and one end of the conductive bar is arranged in the terminal cavity for connecting external lines;

[0009] A fixing device, which is detachably arranged in the terminal cavity and is used to cooperate with a threaded fastener to connect a cable. The fixing device includes a connecting seat and a threaded gasket arranged on the connecting seat;

[0010] A chute is provided at the top of the connecting seat, and the threaded gasket is clamped on the connecting seat through the chute. A clamping groove is provided at the terminal cavity, and the connecting seat has a connecting portion with an I-shaped structure for installing the connecting seat in cooperation with the clamping groove;

[0011] A backstop component is further provided on the connecting seat. The backstop component is used to prevent the connecting seat from being pushed out by an external force during installation. The backstop component includes a limiting arm with a toothed portion and a button that can press one end of the limiting arm to contact the backstop limit. A limiting groove that cooperates with the limiting arm is also provided at the terminal cavity, and a groove that cooperates with the toothed portion is provided in the limiting groove.

[0012] In the present utility model, the backstop component is arranged on the upper part of the connecting seat. A connecting groove for inserting the limiting arm is further provided on the connecting seat. The button is movably arranged on the top of the connecting seat, and one end of the button extends into the connecting groove;

[0013] The limiting arm includes a pressing portion with an arc-shaped structure and an arm body with a horizontal structure. The toothed portion is arranged at the bottom of the arm body. The pressing portion and the arm body are of an integral structure;

[0014] The connecting groove includes a straight groove portion for cooperating with one end of the arm body to connect and a movable area for cooperating with the pressing portion. The pressing portion can swing up and down under the action of the button.

[0015] In the present utility model, an elastic member and a convex block are further provided in the connecting groove. The convex block is used as the rotation fulcrum of the limiting arm. A circular groove for clamping the elastic member is provided at the bottom of the movable area. The other end of the elastic member abuts against the bottom of the pressing portion.

[0016] In the present utility model, the connecting portion is composed of a bottom plate, a connecting column and a seat body. The bottom plate and the seat body are respectively arranged at both ends of the connecting column;

[0017] The clamping groove is composed of two convex walls. The connecting column is arranged between the two convex walls. The bottom plate and the seat body sandwich the convex walls up and down to form a limiting structure.

[0018] In the present utility model, a protrusion is provided on the top surface of the bottom plate, and a backstop groove for cooperating with the protrusion is provided at the bottom of the convex wall to prevent the connecting seat from being pushed out by an external force.

[0019] In the present utility model, sliders are provided on both sides of the threaded gasket. A backstop wall is further provided at the end of the sliding groove. The backstop wall and the sliding groove form a semi-enclosed structure. A threaded groove is provided in the middle of the threaded gasket.

[0020] In the present utility model, the groove is arranged above the clamping groove, and the groove and the limiting arm are located at the same horizontal position.

[0021] (III) Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0023] (1) In this utility model, by designing a fixing device with a chute and a threaded gasket, the rapid installation and disassembly of the cable are realized. The threaded gasket is clamped on the connecting seat through the chute, which not only simplifies the installation steps but also reduces the direct damage to the cable, improving the installation efficiency and convenience.

[0024] (2) The introduction of the anti-retreat component in this utility model effectively prevents the connecting seat from being pushed out by external forces during the installation process. The close fit of the limiting arm with the limiting groove and the groove, as well as the supporting effect of the elastic member on the limiting arm, jointly form a stable anti-retreat mechanism. Even under vibration or external impact, it can ensure that the connecting seat is stable and does not loosen, guaranteeing the reliability of the circuit connection. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of this utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 It is a schematic diagram of the connection structure between the plastic case circuit breaker and the fixing device in Embodiment 1;

[0027] Figure 2 It is a schematic diagram of the internal structure of the plastic case circuit breaker in Embodiment 1;

[0028] Figure 3 It is a three-dimensional structure schematic diagram of the connecting seat in Embodiment 1;

[0029] Figure 4 It is a schematic diagram of the assembled structure of the connecting seat and the threaded gasket in Embodiment 1;

[0030] Figure 5 It is a three-dimensional structure schematic diagram of the limiting arm in Embodiment 1;

[0031] Figure 6 It is a three-dimensional structure schematic diagram of the connecting seat and the limiting arm in Embodiment 1;

[0032] Figure 7 It is a sectional structure schematic diagram of the connecting seat in Embodiment 1;

[0033] Figure 8 It is a partially enlarged schematic diagram of the structure of the base in Embodiment 1.

[0034] 10. Base, 11. Terminal cavity, 12. Operating mechanism, 13. Connecting seat, 14. Card slot, 15. Conductive bar, 16. Base plate, 17. Seat body, 18. Limiting arm, 19. Protrusion, 20. Arm body, 21. Pressing part, 22. Elastic member, 23. Threaded gasket, 24. Chute, 25. Button, 26. Connecting groove, 27. Activity area, 28. Tooth-shaped part, 29. Limiting groove, 30. Groove, 31. Convex wall, 32. Convex block, 33. Connecting column. Detailed implementation manner

[0035] Compared with the embodiments shown in the drawings, the feasible embodiments within the protection scope of the present disclosure may have fewer components, have other components not shown in the drawings, different components, components arranged differently, or components connected differently, etc. In addition, two or more components in the drawings may be implemented in a single component, or a single component shown in the drawings may be implemented as multiple separate components.

[0036] Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present utility model belongs. The "first", "second" and similar terms used in the specification and claims of the patent application of the present utility model do not denote any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "a" or "one" do not necessarily denote a quantity limitation. Words such as "including", "comprising" or "having" mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connection" or "communication" and similar terms are not limited to the physical or mechanical connection or communication shown in the drawings, but may include equivalent connections or communications thereto, whether direct or indirect. "Upper", "lower", "left", "right", "horizontal", "vertical", etc. are only used to represent relative position relationships, and when the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0037] The technical solutions of the present utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0038] Embodiment 1

[0039] As Figures 1 - 2As shown in the figure, the utility model discloses a plastic case circuit breaker, which mainly includes a base 10, two top covers assembled with the base 10, and an operating mechanism 12 arranged inside the plastic case circuit breaker. The base 10 has a cavity for accommodating the operating mechanism 12 and other components, and the top cover is used to seal the cavity, that is, the top cover and the base 10 form a complete housing of the plastic case circuit breaker.

[0040] Specifically, both ends of the base 10 also have terminal cavities 11 for setting terminals. Conductive bars 15 extending towards both ends of the base 10 are arranged at both ends of the operating mechanism 12. One end of the conductive bar 15 is connected to the operating mechanism 12, and the other end is arranged inside the terminal cavity 11 for connecting external cables.

[0041] In order to improve the connection effect with external cables, usually a wiring terminal matching with the end of the conductive bar 15 is arranged outside the end of the conductive bar 15, or a threaded hole is directly arranged at the end of the conductive bar 15 to cooperate with a threaded fastener to press the external cable tightly. That is, the cable is arranged on the top surface or bottom surface of the conductive bar 15, and is pressed by the threaded fastener to achieve electrical connection. The threaded fastener can adopt a bolt, a screw, etc. with a threaded columnar structure and a head with an umbrella structure.

[0042] Both of the above two schemes have the problem that the matching models of the threaded fasteners are relatively single, that is, when the threaded fastener is lost, it can only be assembled through the corresponding size model.

[0043] To solve this problem, refer to Figures 3 - 4 A detachable fixing device is arranged in the terminal cavity 11. The fixing device includes a connecting seat 13 and a threaded gasket 23 slidably assembled on the connecting seat 13. The threaded gasket 23 has a threaded hole. When the fixing device is inserted into the terminal cavity 11, it abuts against the bottom of the conductive bar 15. That is, through the detachable threaded gasket 23, when there are different threaded fasteners, the corresponding threaded gasket 23 can be replaced for adaptation, and the original state is kept highly consistent in use and appearance, which is more reliable.

[0044] Specifically, the connecting seat 13 is integrally in an I-shaped structure, which is composed of a bottom plate 16, a connecting column 33 and a seat body 17. The bottom plate 16 and the seat body 17 are respectively arranged at both ends of the connecting column 33. In this embodiment, the three are of an integral structure, and the length and width of the connecting column 33 are both smaller than the length and width of the seat body 17 and the bottom plate 16. A card slot 14 for clamping the connecting seat 13 is arranged in the terminal cavity 11. The card slot 14 is composed of two hollow rectangular convex walls 31. The convex walls 31 are arranged on both side walls of the lower part of the terminal cavity 11, and the connecting column 33 is clamped between the two convex walls 31, and the two are in an interference fit.

[0045] Specifically, the bottom surface of the seat body 17 and the top surface of the bottom plate 16 are also in contact and cooperation with the top surface and the bottom surface of the convex wall 31, that is, the connecting seat 13 is arranged in the terminal cavity 11 by clamping the convex wall 31 through the seat body 17 and the bottom plate 16.

[0046] A protrusion 19 is provided on the top surface of the bottom plate 16, and an anti-withdrawal groove for cooperating with the protrusion 19 is provided at the bottom of the convex wall 31 to prevent the connecting seat 13 from being pushed out by an external force.

[0047] During the actual use process, the fixing component still has problems such as being easily dislocated or offset during installation or wiring. To overcome this problem, an anti-withdrawal component is also provided on the connecting seat 13 in the present utility model. Refer to Figures 5 - 8 , the anti-withdrawal component includes a limiting arm 18 and a button 25 for pressing one end of the limiting arm 18 to make it in contact and limit. Among them, the button 25 is movably arranged, that is, a groove for the installation and movement of the button 25 is provided on the connecting seat 13. The bottom end of the button 25 abuts against one side of the limiting arm 18. When the button 25 is pressed down, the other side of the limiting arm 18 will tilt up.

[0048] Specifically, a limiting groove 29 for inserting the limiting arm 18 is further provided in the terminal cavity 11. The limiting groove 29 is arranged above the clamping groove 14 and is at the same horizontal position as the limiting arm 18. When the connecting seat 13 is integrally clamped in the clamping groove 14, the limiting arm 18 is inserted into the limiting groove 29.

[0049] In order to better enhance the anti-withdrawal effect, a toothed portion 28 is further provided on the bottom surface of the end of the limiting arm 18 that cooperates with the limiting groove 29, and a groove 30 for cooperating with the toothed portion 28 is provided in the limiting groove 29. The groove 30 and the toothed portion 28 are engaged to better prevent the connecting seat 13 from disengaging from the clamping groove 14 under the action of an external force, that is, the groove 30 and the toothed portion 28 have the same shape.

[0050] Specifically, the limiting arm 18 is composed of a pressing portion 21 with an arc-shaped structure and an arm body 20 with a horizontal structure. The pressing portion 21 and the arm body 20 are integrally formed, and the pressing portion 21 tilts upward. The bottom of the button 25 abuts against the top of the pressing portion 21. The toothed portion 28 is provided at the bottom of the arm body 20. A connecting groove 26 for inserting the limiting arm 18 is provided on the seat body 17. The limiting arm 18 is installed by inserting a part of the end where the arm body 20 is connected to the pressing portion 21 into the connecting groove 26.

[0051] The connection groove 26 is also provided with an activity area 27 for the swinging of the pressing part 21. That is, since the limiting arm 18 needs to drive the arm body 20 to tilt upward to contact the limit through the activity of the pressing part 21, a cavity for the activity of the pressing part 21 is provided in the connection groove 26, and this cavity constitutes the activity area 27. In this embodiment, the activity area 27 is of a fan-shaped structure. To achieve this structure, the groove for installing the button 25 is communicated with the connection groove 26. When it is necessary to contact the limit, the button 25 needs to be pressed downward, and the arm body 20 is driven to tilt upward by pressing down the pressing part 21. In this embodiment, the limiting arm 18 is made of a high-molecular organic plastic with a certain high elasticity.

[0052] To enable the button 25 and the limiting arm 18 to reset better, an elastic member 22 and a convex block 32 are also provided in the connection groove 26. The convex block 32 is used as the rotation fulcrum of the limiting arm 18, and a circular groove for mounting the elastic member 22 is provided at the bottom of the activity area 27. The other end of the elastic member 22 abuts against the bottom of the pressing part 21. In this embodiment, the elastic member 22 can be a spring or an elastic block, such as a sponge block or a rubber block.

[0053] The above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by those of ordinary skill in the art to the technical solution of the present invention shall fall within the protection scope of the present invention. The technical content claimed by the present invention has been fully recorded in the claims.

Claims

1. A molded case circuit breaker, characterized in that, The molded case circuit breaker includes: A base with a cavity, and terminal cavities are provided at both ends of the base; An operating mechanism, which is arranged in the cavity and is used to control the on-off of the circuit connecting the molded case circuit breaker. Conductive bars are provided at both ends of the operating mechanism, and one end of the conductive bar is arranged in the terminal cavity for connecting external lines; A fixing device, which is detachably arranged in the terminal cavity and is used to cooperate with threaded fasteners to connect cables. The fixing device includes a connecting seat and a threaded gasket arranged on the connecting seat; A chute is provided at the top of the connecting seat, and the threaded gasket is clamped on the connecting seat through the chute. A clamping groove is provided at the terminal cavity, and the connecting seat has a connecting part with an I-shaped structure for installing the connecting seat in cooperation with the clamping groove; A back-off prevention component is further provided on the connecting seat. The back-off prevention component is used to prevent the connecting seat from being pushed out by external force during installation. The back-off prevention component includes a limiting arm with a toothed part and a button that can press one end of the limiting arm to contact the back-off limit. A limiting groove cooperating with the limiting arm is also provided at the terminal cavity, and a groove cooperating with the toothed part is provided in the limiting groove; 2. The molded case circuit breaker according to claim 1, wherein The back-off prevention component is arranged on the upper part of the connecting seat. A connecting groove for inserting the limiting arm is further provided on the connecting seat. The button is movably arranged on the top of the connecting seat, and one end of the button extends into the connecting groove; The limiting arm includes a pressing part with an arc-shaped structure and an arm body with a horizontal structure. The toothed part is arranged at the bottom of the arm body, and the pressing part and the arm body are of an integral structure; The connecting groove includes a straight groove part for cooperating with one end of the arm body to connect and a movable area for cooperating with the pressing part. The pressing part can swing up and down under the action of the button; 3. The molded case circuit breaker according to claim 2, wherein, An elastic member and a convex block are further provided in the connecting groove. The convex block is used as the rotation fulcrum of the limiting arm, and a round groove for clamping the elastic member is provided at the bottom of the movable area. The other end of the elastic member abuts against the bottom of the pressing part; 4. The molded case circuit breaker according to claim 1 or 3, characterized in that, The connecting part is composed of a bottom plate, a connecting column and a seat body. The bottom plate and the seat body are respectively arranged at both ends of the connecting column; The clamping groove is composed of two convex walls. The connecting column is arranged between the two convex walls, and the bottom plate and the seat body clamp the convex walls up and down to form a limiting structure; 5. The molded case circuit breaker according to claim 4, characterized in that, A protrusion is provided on the top surface of the bottom plate, and a back-off prevention groove cooperating with the protrusion is provided at the bottom of the convex wall to prevent the connecting seat from being pushed out by external force; 6. The molded case circuit breaker according to claim 5, characterized in that, Sliders are provided on both sides of the threaded gasket, and a back-off prevention wall is further provided at the end of the chute. The back-off prevention wall and the chute form a semi-surrounding structure, and a threaded groove is provided in the middle of the threaded gasket; 7. The molded case circuit breaker according to claim 6, wherein, The groove is arranged above the clamping groove, and the groove and the limiting arm are at the same horizontal position.

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