An integrated arc chute structure for a circuit breaker

Abstract

The utility model relates to an integrated arc extinguishing chamber structure of circuit breaker, including bottom shell, install arc extinguishing chamber in bottom shell, arc extinguishing chamber includes contact support and located arc extinguishing grid piece on both sides of contact support, contact support includes base, a pair of support plate and movable contact, support plate connects on base and interval forms movable slot, movable contact sets up in the top of movable slot, the bottom surface of base is connected with arc guide plate, and the top surface is equipped with the support spring of movable contact bottom surface, the front side of support plate both sides is equipped with the clamping groove, and arc extinguishing grid piece is equipped with a pair of clamping feet, and clamping foot corresponds and inserts a pair of support plate's clamping groove and with the inner wall of clamping groove is close tightly, realized with contact support connection arc extinguishing grid piece and arc guide plate, formed integrated arc extinguishing chamber, clamping foot inserts clamping groove and clamps from both sides support plate, can directly pull to one side to quickly remove, optimized arc extinguishing chamber subassembly's connection mode, simplified arc extinguishing chamber installation to bottom shell operation step.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to an integrated arc-extinguishing chamber structure for a circuit breaker. Background Technology

[0002] A circuit breaker is a switching device capable of closing, carrying, and interrupting current under normal circuit conditions and closing, carrying, and interrupting current under abnormal circuit conditions within a specified time. It can automatically disconnect the circuit in the event of severe overload, short circuit, or undervoltage faults and has been widely used. The arc generated when the circuit breaker opens its contacts can cause a short circuit in internal components. Typically, an arc-extinguishing chamber is installed inside the circuit breaker to protect it. Under the contraction force of the magnetic lines of force and the action of the arc-initiating plate at the bottom of the arc-extinguishing chamber, the arc is drawn into the arc-extinguishing grid plates that constitute the arc-extinguishing chamber. A long arc is divided into multiple short arcs, and all short arcs extinguish simultaneously when the alternating current crosses zero. The existing arc-extinguishing chamber structure of circuit breakers typically consists of scattered contact supports, arc-extinguishing grids, and arc-starting plates. These components require corresponding clips and slots within the circuit breaker's base shell for sequential assembly. This structure necessitates the individual removal or fixing of each component during arc-extinguishing chamber assembly and disassembly, resulting in complex procedures, numerous parts to handle, and hindering assembly efficiency. Furthermore, the compactness between components is poor. Therefore, designing an integrated arc-extinguishing chamber structure for circuit breakers that improves assembly efficiency and optimizes component connections has become an urgent technical challenge. Summary of the Invention

[0003] To solve the above problems, this utility model provides an integrated arc-extinguishing chamber structure for a circuit breaker.

[0004] The present invention provides an integrated arc-extinguishing chamber structure for a circuit breaker, comprising a bottom shell, an arc-extinguishing chamber installed inside the bottom shell, and an arc-extinguishing chamber including a contact support and arc-extinguishing grid plates located on both sides of the contact support. The contact support includes a base, a pair of support plates, and a moving contact. The support plates are connected to the base and form movable slots at intervals. The moving contact is disposed at the top of the movable slot. An arc-inducing plate is connected to the bottom surface of the base, and a support spring is provided on the top surface to connect to the bottom surface of the moving contact. Clamping slots are provided on both sides of the front of the support plates, and the arc-extinguishing grid plates are provided with a pair of clamping feet. The clamping feet extend into the clamping slots of the pair of support plates and abut against the inner wall of the clamping slots.

[0005] With the above structure, the arc-initiating plate is connected to the bottom surface of the base, and the clamping feet of the arc-extinguishing grid extend into the clamping groove of the support plate and abut against the inner wall of the clamping groove. This first integrates the contact support, arc-extinguishing grid, and arc-initiating plate into a complete arc-extinguishing chamber structure, which is then installed into the bottom shell of the circuit breaker. This simplifies the assembly process and improves the compactness between the various components, helping the arc to be correctly introduced into the arc-extinguishing grid for extinguishing. When the circuit breaker automatically disconnects the circuit, the motor inside the circuit breaker drives the push rod, which pushes the moving contact towards the base, separating it from the stationary contact. The support spring compresses, generating elastic force, and the arc generated by the separation of the moving contact contracts under the magnetic field lines. Under the action of force and the arc-starting plate, the arc is drawn into the arc-extinguishing grid plates located on both sides of the contact support and separated, and the long arc is divided into multiple short arcs. When the AC current crosses zero, the short arcs are extinguished. By directly pulling the arc-extinguishing grid plates to both sides of the contact support, the clamping feet are pulled out of the clamping slots, and the arc-extinguishing grid plates are quickly separated from the contact support, which is convenient for replacing and maintaining the arc-extinguishing grid plates. It realizes the connection of the arc-extinguishing grid plates and the arc-starting plate using the contact support to form an integrated arc-extinguishing chamber. The clamping feet extend into the clamping slots to clamp the support plates from both sides, and the arc-extinguishing grid plates can be pulled directly to the side to be quickly removed from the contact support. This optimizes the connection method of the arc-extinguishing chamber assembly and simplifies the operation steps of installing the arc-extinguishing chamber to the base.

[0006] As a further improvement of this utility model, the front of the support plate is also provided with a sliding groove perpendicular to the base, the bottom of the sliding groove is provided with an inlet and outlet, the bottom shell is provided with a cavity that matches the volume of the arc-extinguishing chamber, the cavity is provided with an opening for the arc-extinguishing chamber to enter and exit, and the side wall of the cavity is provided with a plug-in block corresponding to the sliding groove.

[0007] With the above structure, by aligning the arc-extinguishing chamber with the opening of the cavity, aligning the plug-in block with the inlet and outlet of the slide, and then pushing the arc-extinguishing chamber into the cavity, while the plug-in block enters the slide, the installation of the arc-extinguishing chamber in the bottom shell is completed. The movement of the plug-in block along the slide guides the movement path of the arc-extinguishing chamber when it enters and exits the cavity.

[0008] As a further improvement of this utility model, the end of the clamping foot is provided with a snap-fit ​​part that protrudes into the inner side of the arc-extinguishing grid plate, and the inner wall of the clamping groove is provided with a snap-fit ​​groove corresponding to the snap-fit ​​part.

[0009] With the above structure, after the clamping foot extends into the clamping groove, the snap-fit ​​part protruding inward at the end enters the snap-fit ​​groove accordingly, restricting the clamping foot from leaving the clamping groove, and preventing the arc-extinguishing grid plate from coming loose from the contact support due to slight bumps when disassembling and assembling the arc-extinguishing chamber.

[0010] As a further improvement of this utility model, the side of the snap-fit ​​part is provided with an arc-shaped extrusion surface.

[0011] With the above structure, the side of the snap-fit ​​part has an arc-shaped extrusion surface. When it is necessary to pull the arc-extinguishing grid plate to remove it from the contact support, the arc-shaped extrusion surface contacts the edge of the snap-fit ​​groove, guiding the snap-fit ​​part to move outward away from the snap-fit ​​groove, making it easier to actively remove the arc-extinguishing grid plate.

[0012] As a further improvement of this utility model, the bottom surface of the base is provided with a protruding positioning post and a fixing buckle. The arc-guiding plate is provided with a positioning hole corresponding to the positioning post and a buckle hole corresponding to the fixing buckle. The positioning post is inserted downward into the positioning hole and fits against the inner wall of the positioning hole. The fixing buckle passes through the buckle hole so that the base fits against the arc-guiding plate for buckle connection.

[0013] With the above structure, by aligning the positioning pin with the positioning hole on the arc-initiating plate and the fixing buckle with the buckle hole, the fixing buckle is pushed through the buckle hole and hooked onto the bottom surface of the arc-initiating plate, so that the base fits against the arc-initiating plate for buckle connection. At the same time, the positioning pin is inserted into the positioning hole to prevent the arc-initiating plate from sliding laterally.

[0014] As a further improvement of this utility model, the side of the positioning post is provided with multiple vertical protrusions, which abut against the inner wall of the positioning hole.

[0015] With the above structure, the protruding ridge on the side of the positioning post abuts against the inner wall of the positioning hole. After the positioning post is inserted into the positioning hole, it has interference friction with the hole wall, which restricts the vertical movement of the arc-guiding plate at the positioning hole.

[0016] As a further improvement of this utility model, the bottom surface of the base is provided with a positioning groove, and the positioning post, fixing buckle and the middle part of the arc-inducing plate are all set in the positioning groove, and the end of the arc-inducing plate extends to the bottom of the arc-extinguishing grid plate.

[0017] With the above structure, the bottom surface of the base is provided with a positioning groove, and the positioning column, fixing buckle and the middle part of the arc-quenching plate are all set in the positioning groove, which reduces the space occupied by the arc-quenching chamber and makes the structure of the integrated arc-quenching chamber more compact. The end of the arc-quenching plate extends to the bottom of the arc-quenching grid, which can effectively guide the long arc into the arc-quenching grid for separation.

[0018] As a further improvement of this utility model, the number of arc-extinguishing grid plates located on the contact support side is 10.

[0019] With the above structure, the number of arc-extinguishing grid plates located on the contact support side is 10, which can effectively separate the long arc into short arcs and help to completely extinguish the arc. Attached Figure Description

[0020] Figure 1 The diagram shows the assembly structure of the bottom shell and arc-extinguishing chamber of this utility model.

[0021] Figure 2The diagram shown is a schematic of the arc-extinguishing chamber structure.

[0022] Figure 3 The diagram shown is a structural schematic of the arc-extinguishing chamber in its disassembled state.

[0023] Figure 4 The diagram shown is a schematic of the contact support structure.

[0024] Figure 5 The diagram shows the positioning post and fixing buckle structure of part A.

[0025] 1-Bottom shell, 2-Arc extinguishing grid plate, 3-Base, 4-Support plate, 5-Moving contact, 6-Movable groove, 7-Arc ignition plate, 8-Support spring, 9-Clamping groove, 10-Clamping foot, 11-Slide groove, 12-Inlet / outlet, 13-Cavity, 14-Plug-in block, 15-Snap-in part, 16-Snap-in groove, 17-Extrusion surface, 18-Positioning post, 19-Fixing buckle, 20-Positioning hole, 21-Snap-in hole, 22-Protruding ridge, 23-Positioning groove. Detailed Implementation

[0026] like Figures 1-5 The diagram shows an integrated arc-extinguishing chamber structure for a circuit breaker, comprising a base shell 1, an arc-extinguishing chamber installed inside the base shell 1, the arc-extinguishing chamber including a contact support and arc-extinguishing grid plates 2 located on both sides of the contact support, the contact support including a base 3, a pair of support plates 4 and a moving contact 5, the support plates 4 being connected to the base 3 and forming movable grooves 6 at intervals, the moving contact 5 being disposed at the top of the movable groove 6, an arc-inducing plate 7 being connected to the bottom surface of the base 3, a support spring 8 being provided on the top surface connecting to the bottom surface of the moving contact 5, clamping grooves 9 being provided on both sides of the front of the support plates 4, and a pair of clamping feet 10 being provided on the arc-extinguishing grid plates 2, the clamping feet 10 correspondingly extending into the clamping grooves 9 of the pair of support plates 4 and abutting against the inner wall of the clamping grooves 9.

[0027] The arc-initiating plate 7 is connected to the bottom surface of the base 3. The clamping feet 10 of the arc-extinguishing grid plate 2 extend into the clamping groove 9 of the support plate 4 and abut against the inner wall of the clamping groove 9. This first connects the components such as the contact support, the arc-extinguishing grid plate 2, and the arc-initiating plate 7 into a complete arc-extinguishing chamber structure, which is then installed into the bottom shell 1 of the circuit breaker. This simplifies the assembly steps and improves the compactness between the various components, which helps the arc to be correctly introduced into the arc-extinguishing grid plate 2 for extinguishing. When the circuit is automatically disconnected by the circuit breaker, the motor inside the circuit breaker drives the push rod, which pushes the moving contact 5 to move towards the base 3 and separate from the stationary contact. The support spring 8 is compressed to generate elastic force. The arc generated by the separation of the moving contact 5 is subjected to the contraction force of the magnetic lines of force and the arc-initiating force. Under the action of plate 7, the arc is introduced into the arc-extinguishing grid 2 located on both sides of the contact support and separated. The long arc is transformed into multiple short arcs, which are extinguished when the AC current crosses zero. By directly pulling the arc-extinguishing grid 2 to both sides of the contact support, the clamping foot 10 is pulled out from the clamping groove 9, completing the rapid separation of the arc-extinguishing grid 2 from the contact support, which facilitates the replacement and maintenance of the arc-extinguishing grid 2. It realizes the connection of the arc-extinguishing grid 2 and the arc-initiating plate 7 using the contact support to form an integrated arc-extinguishing chamber. The clamping foot 10 extends into the clamping groove 9 to clamp the support plate 4 from both sides, and can directly pull the arc-extinguishing grid 2 to the side to quickly remove it from the contact support. This optimizes the connection method of the arc-extinguishing chamber assembly and simplifies the operation steps of installing the arc-extinguishing chamber to the base shell 1.

[0028] The front of the support plate 4 is also provided with a sliding groove 11 perpendicular to the base 3. The bottom of the sliding groove 11 is provided with an inlet and outlet 12. The bottom shell 1 is provided with a cavity 13 that matches the volume of the arc-extinguishing chamber. The cavity 13 is provided with an opening for the arc-extinguishing chamber to enter and exit. The side wall of the cavity 13 is provided with a plug-in block 14 corresponding to the sliding groove 11.

[0029] By aligning the arc-extinguishing chamber with the opening of the cavity 13, aligning the plug-in block 14 with the inlet and outlet 12 of the slide groove 11, and then pushing the arc-extinguishing chamber into the cavity 13, the plug-in block 14 enters the slide groove 11, thus completing the installation of the arc-extinguishing chamber in the bottom shell 1. The plug-in block 14 is moved along the slide groove 11 to guide the movement path of the arc-extinguishing chamber when it enters and exits the cavity 13.

[0030] The end of the clamping foot 10 is provided with a snap-fit ​​part 15 that protrudes into the inside of the arc-extinguishing grid plate 2, and the inner wall of the clamping groove 9 is provided with a snap-fit ​​groove 16 corresponding to the snap-fit ​​part 15.

[0031] After the clamping foot 10 extends into the clamping groove 9, the snap-fit ​​part 15 protruding inward at the end enters the snap-fit ​​groove 16, restricting the clamping foot 10 from leaving the clamping groove 9, and preventing the arc-extinguishing grid plate 2 from coming loose from the contact support due to slight bumps when disassembling and assembling the arc-extinguishing chamber.

[0032] The snap-fit ​​part 15 has an arc-shaped extrusion surface 17 on its side.

[0033] The side of the snap-fit ​​part 15 has an arc-shaped pressing surface 17. When the arc-extinguishing grid plate 2 needs to be pulled and removed from the contact support, the arc-shaped pressing surface 17 contacts the edge of the snap-fit ​​groove 16, guiding the snap-fit ​​part 15 to move outward away from the snap-fit ​​groove 16, making it easier to actively remove the arc-extinguishing grid plate 2.

[0034] The bottom surface of the base 3 is provided with a protruding positioning post 18 and a fixing buckle 19. The arc-guiding plate 7 is provided with a positioning hole 20 corresponding to the positioning post 18 and a buckle hole 21 corresponding to the fixing buckle 19. The positioning post 18 is inserted downward into the positioning hole 20 and fits against the inner wall of the positioning hole 20. The fixing buckle 19 passes through the buckle hole 21 to make the base 3 fit against the arc-guiding plate 7 for buckle connection.

[0035] By aligning the positioning pin 18 with the positioning hole 20 on the arc-inducing plate 7 and the fixing buckle 19 with the buckle hole 21, the fixing buckle 19 is pushed through the buckle hole 21 and hooked onto the bottom surface of the arc-inducing plate 7, so that the base 3 is attached to the arc-inducing plate 7 for buckle connection. At the same time, the positioning pin 18 is inserted into the positioning hole 20 to prevent the arc-inducing plate 7 from sliding laterally.

[0036] The side of the positioning post 18 is provided with multiple vertical protrusions 22, which abut against the inner wall of the positioning hole 20.

[0037] The protruding ridge 22 on the side of the positioning post 18 abuts against the inner wall of the positioning hole 20. After the positioning post 18 is inserted into the positioning hole 20, it causes interference friction with the hole wall of the positioning hole 20, thus restricting the vertical movement of the arc-guiding plate 7 at the positioning hole 20.

[0038] The bottom surface of the base 3 is provided with a positioning groove 23. The positioning post 18, the fixing buckle 19 and the middle part of the arc-inducing plate 7 are all set in the positioning groove 23. The end of the arc-inducing plate 7 extends to the bottom of the arc-extinguishing grid plate 2.

[0039] The base 3 has a positioning groove 23 on its bottom surface. The positioning column 18, the fixing buckle 19 and the middle part of the arc-inducing plate 7 are all set in the positioning groove 23, which reduces the space occupied by the arc-extinguishing chamber and makes the structure of the integrated arc-extinguishing chamber more compact. The end of the arc-inducing plate 7 extends to the bottom of the arc-extinguishing grid plate 2, which can effectively introduce the long arc into the arc-extinguishing grid plate 2 for separation.

[0040] The number of arc-extinguishing grid plates 2 located on the contact support side is 10.

[0041] With 10 arc-extinguishing grid plates 2 located on the contact support side, long arcs can be effectively separated into short arcs, which helps to completely extinguish the arc.

Claims

1. An integrated arc-extinguishing chamber structure for a circuit breaker, characterized in that: The device includes a bottom shell (1), an arc-extinguishing chamber is installed inside the bottom shell (1), the arc-extinguishing chamber includes a contact support and arc-extinguishing grid plates (2) located on both sides of the contact support, the contact support includes a base (3), a pair of support plates (4) and a moving contact (5), the support plates (4) are connected to the base (3) and form movable grooves (6) at intervals, the moving contact (5) is set at the top of the movable groove (6), the bottom surface of the base (3) is connected to an arc-inducing plate (7), the top surface is provided with a support spring (8) connected to the bottom surface of the moving contact (5), the front sides of the support plate (4) are provided with clamping grooves (9), the arc-extinguishing grid plates (2) are provided with a pair of clamping feet (10), the clamping feet (10) extend into the clamping grooves (9) of the pair of support plates (4) and abut against the inner wall of the clamping grooves (9).

2. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The front of the support plate (4) is also provided with a sliding groove (11) perpendicular to the base (3). The bottom of the sliding groove (11) is provided with an inlet and outlet (12). The bottom shell (1) is provided with a cavity (13) that matches the volume of the arc-extinguishing chamber. The cavity (13) is provided with an opening for the arc-extinguishing chamber to enter and exit. The side wall of the cavity (13) is provided with a plug-in block (14) corresponding to the sliding groove (11).

3. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The end of the clamping foot (10) is provided with a snap-fit ​​part (15) that protrudes into the inside of the arc-extinguishing grid plate (2), and the inner wall of the clamping groove (9) is provided with a snap-fit ​​groove (16) corresponding to the snap-fit ​​part (15).

4. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 3, characterized in that: The snap-fit ​​part (15) has an arc-shaped extrusion surface (17) on its side.

5. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The bottom surface of the base (3) is provided with a protruding positioning post (18) and a fixing buckle (19). The arc-guiding plate (7) is provided with a positioning hole (20) corresponding to the positioning post (18) and a buckle hole (21) corresponding to the fixing buckle (19). The positioning post (18) is inserted downward into the positioning hole (20) and fits against the inner wall of the positioning hole (20). The fixing buckle (19) passes through the buckle hole (21) so that the base (3) fits against the arc-guiding plate (7) for buckle connection.

6. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 5, characterized in that: The side of the positioning post (18) is provided with multiple vertical protrusions (22), which abut against the inner wall of the positioning hole (20).

7. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 5, characterized in that: The bottom surface of the base (3) is provided with a positioning groove (23). The positioning post (18), the fixing buckle (19) and the middle part of the arc-inducing plate (7) are all set in the positioning groove (23). The end of the arc-inducing plate (7) extends to the bottom of the arc-extinguishing grid plate (2).

8. The integrated arc-extinguishing chamber structure of a circuit breaker according to claim 1, characterized in that: The number of arc-extinguishing grid plates (2) located on the contact support side is 10.

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