A circuit breaker

Abstract

This utility model discloses a circuit breaker, comprising: a housing and an arc-extinguishing system, wherein the arc-extinguishing system is disposed inside the housing; the arc-extinguishing system includes: an arc-initiating plate, a first magnetic plate, an arc-isolating plate, and an arc-extinguishing chamber; the arc-extinguishing chamber is provided with multiple parallel-arranged arc-extinguishing grid plates, each with an arc-extinguishing groove, the arc-extinguishing grooves of adjacent arc-extinguishing grid plates being staggered; the arc-isolating plate and the first magnetic plate are arranged in parallel, and a cavity is formed between the arc-isolating plate and the first magnetic plate, the opening of which faces the arc-extinguishing groove; the arc-initiating plate is located on the periphery of the arc-extinguishing chamber and the arc-isolating plate. The circuit breaker of this utility model can divide the electric arc into multiple segments, achieving rapid arc extinguishing.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, and more specifically to a circuit breaker. Background Technology

[0002] A circuit breaker is an instrument that allows external operating devices to manually open or close a energized circuit and automatically disconnect overloaded or short-circuited circuits. The arc-extinguishing chamber is a crucial component of a circuit breaker; the electric arc generated during the opening and closing process is extinguished in the arc-extinguishing chamber to prevent damage to the circuit breaker.

[0003] Currently, the arc-extinguishing chamber of circuit breakers mainly uses arc-extinguishing grid plates for arc extinguishing. The structure of the arc-extinguishing chamber primarily consists of arc-initiating plates, arc-extinguishing grid plates, and a housing. Multiple arc-extinguishing grid plates are typically arranged at intervals. During arc extinguishing, the arc-initiating plates need to introduce the arc between two adjacent arc-extinguishing grid plates. However, existing arc-extinguishing chambers cannot effectively cut off the arc, resulting in poor arc extinguishing performance.

[0004] Therefore, developing a circuit breaker with good arc extinguishing effect is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0005] In view of this, the present invention provides a circuit breaker with good arc extinguishing effect.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A circuit breaker, comprising:

[0008] case,

[0009] An arc-extinguishing system is disposed inside the housing. The arc-extinguishing system includes an arc-initiating plate, a first magnetically conductive plate, an arc-isolating plate, and an arc-extinguishing chamber. Multiple parallel-arranged arc-extinguishing grid plates are disposed within the arc-extinguishing chamber. Each arc-extinguishing grid plate has an arc-extinguishing groove, and the arc-extinguishing grooves of adjacent arc-extinguishing grid plates are staggered. The arc-isolating plate and the first magnetically conductive plate are arranged in parallel, and a cavity is formed between them, with the opening of the cavity facing the arc-extinguishing groove. The arc-initiating plate is located around the arc-extinguishing chamber and the arc-isolating plate.

[0010] The beneficial effect of adopting the above technical solution is that the arc-extinguishing grooves on the multiple arc-extinguishing grid plates in this utility model are arranged in an alternating manner. When the electric arc enters the arc-extinguishing chamber, it is divided into multiple small arc segments. As the resistance increases, the electric arc gradually disappears, thus extinguishing the arc. The arc-extinguishing system of this utility model can effectively improve the arc-extinguishing effect.

[0011] Preferably, the housing is provided with an inlet terminal and an outlet terminal, respectively, and the inlet terminal and the outlet terminal are respectively connected to the wire.

[0012] Preferably, the housing is further provided with a short-circuit protection mechanism, which includes a magnetic yoke, an electromagnetic coil, and a trip unit. The magnetic yoke is sleeved on the outside of the trip unit and is U-shaped. The electromagnetic coil is sleeved on the outside of the trip unit and placed within the U-shaped space of the magnetic yoke. An input terminal block is connected to the end of the electromagnetic coil, and the input terminal block is connected to the input terminal. In the event of a short circuit, the push rod in the short-circuit protection mechanism pushes open the moving contact rod, thereby disconnecting the circuit breaker.

[0013] Preferably, the end of the trip unit is connected to a stationary contact rod, and the stationary contact rod is provided with a stationary contact point; the trip unit is provided with a push rod inside, and the end of the trip unit near the stationary contact rod has an opening for the push rod to be pushed out. When a short circuit occurs, the current increases instantaneously, and the electromagnetic coil generates a magnetic field. Under the action of the magnetic field, the push rod inside the trip unit will move outward, pushing open the moving contact rod and automatically disconnecting the circuit breaker.

[0014] Preferably, the housing further includes a tripping mechanism, which comprises: a handle, a tension spring, a connecting rod, a moving contact rod, a lever, and a return spring; the middle portion of the moving contact rod and the middle portion of the lever are rotatably connected coaxially by a rotating shaft, and the rotating shaft is connected to the housing; the return spring is sleeved outside the rotating shaft and abuts against the lever and a fixed shaft, the fixed shaft being connected to the housing; one end of the connecting rod is connected to the handle, and the other end is connected to the moving contact rod, the other end of which is provided with a moving contact point; the moving contact rod swings to open and close the moving contact point and the stationary contact point; one end of the tension spring is connected to the housing, and the other end is connected to the end of the moving contact rod near the handle. The circuit breaker can be opened and closed by actuating the tripping mechanism via the handle.

[0015] Preferably, the end of the connecting rod away from the handle is connected to a jumper, and the jumper is connected to the moving contact rod.

[0016] Preferably, the connection end between the jump buckle and the movable contact rod is provided with an indicator, and both the jump buckle and the movable contact rod are rotatably connected to the indicator.

[0017] Preferably, the housing also includes an overload protection mechanism, which comprises a tripping rod and a bimetallic strip. One end of the tripping rod is connected to a lever, and the other end is connected to the bimetallic strip. One end of the bimetallic strip is connected to a moving contact rod via a wire, and the other end is connected to an outgoing terminal block via a wire. The outgoing terminal block is connected to the outgoing terminal. When an overload occurs, the bimetallic strip overheats and deforms, causing the tripping rod to rotate the lever, which in turn rotates the moving contact rod, causing the moving contact and stationary contact to disconnect, thus disconnecting the circuit breaker.

[0018] Preferably, the end of the stationary contact rod with the stationary contact point is hook-shaped, and a hook-shaped second magnetic sheet is provided on the inner side of the hook-shaped end of the stationary contact rod.

[0019] Preferably, the housing is connected with a snap fastener for connection to external components.

[0020] As can be seen from the above technical solution, compared with the prior art, this utility model discloses a circuit breaker, the beneficial effects of which are:

[0021] (1) In this utility model, the arc entering the arc-extinguishing chamber is divided into small arc segments by the arc-extinguishing grid, which can achieve rapid arc extinguishing;

[0022] (2) The combination of short circuit protection mechanism, tripping mechanism and overload protection mechanism can automatically disconnect the circuit when a short circuit or overload occurs. Attached Figure Description

[0023] 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, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 The attached figure is a schematic diagram of the external structure of the circuit breaker provided by this utility model;

[0025] Figure 2 The attached figure is a schematic diagram of the internal structure of the circuit breaker provided by this utility model;

[0026] Figure 3 The attached figure shows the invention provided by this utility model. Figure 2 A structural diagram of the back side;

[0027] Figure 4 The attached figure shows the invention provided by this utility model. Figure 2 Front view of the rear;

[0028] Figure 5 The attached figure is a structural schematic diagram of the arc extinguishing system provided by this utility model;

[0029] Figure 6 The attached figure is a structural schematic diagram of the arc-extinguishing chamber provided by this utility model;

[0030] Figure 7 The attached figure is a structural schematic diagram of the arc-extinguishing grid provided by this utility model.

[0031] In the figure,

[0032] 1-Shell;

[0033] 2-Arc extinguishing system;

[0034] 21-Arc-initiating plate; 22-First magnetically conductive plate; 23-Arc-isolating plate; 24-Arc-extinguishing chamber; 25-Arc-extinguishing grid plate; 26-Arc-extinguishing groove; 27-Second magnetically conductive plate;

[0035] 3-Incoming terminal; 4-Outgoing terminal;

[0036] 5-Short circuit protection mechanism;

[0037] 51-Magnetic yoke; 52-Electromagnetic coil; 53-Trigger; 54-Push rod;

[0038] 6-Incoming terminal block; 7-Stationary contact rod; 8-Stationary contact point;

[0039] 9-Trigger mechanism;

[0040] 91-Handle; 92-Tension spring; 93-Connecting rod; 94-Moving contact rod; 95-Lever; 96-Return spring; 97-Rotating shaft; 98-Fixed shaft; 99-Moving contact; 910-Clutch; 911-Indicator;

[0041] 10 - Overload protection mechanism;

[0042] 101-Trigger lever; 102-Bimetallic strip;

[0043] 11-Outgoing terminal block; 12-Snap-on clip. Detailed Implementation

[0044] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] like Figure 1 , 5 As shown in Figures 6 and 7, this utility model embodiment discloses a circuit breaker, comprising:

[0046] Casing 1,

[0047] Arc extinguishing system 2 is disposed inside the housing 1. Arc extinguishing system 2 includes: an arc-initiating plate 21, a first magnetic conductive plate 22, an arc-isolating plate 23, and an arc-extinguishing chamber 24. Multiple parallel arc-extinguishing grid plates 25 are disposed within the arc-extinguishing chamber 24, each with an arc-extinguishing groove 26. The arc-extinguishing grooves 26 of adjacent arc-extinguishing grid plates 25 are staggered. The arc-isolating plate 23 and the first magnetic conductive plate 22 are arranged in parallel, forming a cavity between them, with the opening of the cavity facing the arc-extinguishing groove 26. The arc-initiating plate 21 is located around the arc-extinguishing chamber 24 and the arc-isolating plate 23. The arc-initiating plate 21, the first magnetic conductive plate 22, and the second magnetic conductive plate 27 all serve to initiate the arc, guiding the electric arc into the arc-extinguishing chamber 24 for arc extinguishing.

[0048] To further optimize the above technical solution, the inlet and outlet ends of the housing 1 are respectively provided with inlet terminal 3 and outlet terminal 4, and inlet terminal 3 and outlet terminal 4 are respectively connected to the wire.

[0049] like Figure 2-4 As shown, in order to further optimize the above technical solution, the housing 1 is also provided with a short circuit protection mechanism 5. The short circuit protection mechanism 5 includes: a magnetic yoke 51, an electromagnetic coil 52 and a trip unit 53. The magnetic yoke 51 is sleeved on the outside of the trip unit 53 and is U-shaped. The electromagnetic coil 52 is sleeved on the outside of the trip unit 53 and is placed in the U-shaped space of the magnetic yoke 51. The end of the electromagnetic coil 52 is connected to an inlet terminal block 6, which is connected to the inlet terminal 3.

[0050] To further optimize the above technical solution, a stationary contact rod 7 is connected to the end of the trip unit 53, and a stationary contact point 8 is provided on the stationary contact rod 7; a push rod 54 is provided inside the trip unit 53, and an opening is provided at the end of the trip unit 53 near the stationary contact rod 7 for the push rod 54 to be pushed out.

[0051] like Figure 2-4 As shown, to further optimize the above technical solution, a release mechanism 9 is also provided inside the housing 1. The release mechanism 9 includes: a handle 91, a tension spring 92, a connecting rod 93, a movable contact rod 94, a lever 95, and a return spring 96. The middle part of the movable contact rod 94 and the middle part of the lever 95 are coaxially rotatably connected by a rotating shaft 97, and the rotating shaft 97 is connected to the housing 1. The return spring 96 is sleeved outside the rotating shaft 97 and abuts between the lever 95 and the fixed shaft 98, and the fixed shaft 98 is connected to the housing 1. One end of the connecting rod 93 is connected to the handle 91, and the other end is connected to the movable contact rod 94. The other end of the movable contact rod 94 is provided with a movable contact 99. The movable contact rod 94 swings to drive the opening and closing of the movable contact 99 and the stationary contact 8. One end of the tension spring 92 is connected to the housing 1, and the other end is connected to the end of the movable contact rod 94 near the handle 91.

[0052] To further optimize the above technical solution, the fixed shaft 98 passes through the movable contact rod 94, and the movable contact rod 94 is provided with an arc-shaped waist-shaped hole at the position corresponding to the fixed shaft 98, so as to avoid the fixed shaft 98 affecting the swing of the movable contact rod 94.

[0053] To further optimize the above technical solution, a jumper 910 is connected to the end of the connecting rod 93 away from the handle 91, and the jumper 910 is connected to the moving contact rod 94.

[0054] To further optimize the above technical solution, an indicator 911 is provided at the connection end between the jump buckle 910 and the moving contact rod 94, and both the jump buckle 910 and the moving contact rod 94 are rotatably connected to the indicator 911.

[0055] To further optimize the above technical solution, an overload protection mechanism 10 is also provided inside the housing 1. The overload protection mechanism 10 includes: a tripping rod 101 and a bimetallic strip 102; one end of the tripping rod 101 is connected to the lever 95, and the other end is connected to the bimetallic strip 102; one end of the bimetallic strip 102 is connected to the moving contact rod 94 through a wire, and the other end is connected to the outgoing terminal block 11 through a wire, and the outgoing terminal block 11 is connected to the outgoing terminal 4.

[0056] To further optimize the above technical solution, the end of the stationary contact rod 7 with the stationary contact point 8 is hook-shaped, and a hook-shaped second magnetic conductive sheet 27 is provided on the inner side of the hook-shaped end of the stationary contact rod 7. The shape of the second magnetic conductive sheet 27 can also serve to induce an arc.

[0057] To further optimize the above technical solution, the housing 1 is connected with a buckle 12 for connecting with external components.

[0058] Working principle:

[0059] Short circuit protection: When the circuit breaker is closed, if a short circuit occurs, the current will increase. The electromagnetic coil 52 will generate a magnetic field, causing the push rod 54 inside the trip unit 53 to push outward. Figure 2 As shown, during the process of the push rod 54 being pushed out, it will press against the left side of the lever 95, causing the lever 95 to rotate counterclockwise. The right side of the lever 95 will press against the upper end of the moving contact rod 94, causing the moving contact 99 to separate from the stationary contact 8, and the circuit breaker will disconnect.

[0060] Overload protection: When the circuit breaker is closed, if an overload occurs, the bimetallic strip 102 will generate heat and deform, such as... Figure 2 As shown, the bimetallic strip 102 will bend to the right, causing the trip lever 101 and the left side of the lever 95 to move to the right. At this time, the lever 95 rotates counterclockwise, and the right side of the lever 95 will press against the upper end of the moving contact rod 94, causing the moving contact 99 to separate from the stationary contact 8, and the circuit breaker will disconnect.

[0061] Arc extinguishing: When the circuit breaker is closing or opening, an electric arc will be generated. Under the arc ignition action of the arc ignition plate 21, the first magnetic plate 22, and the second magnetic plate 27, the electric arc is led into the arc extinguishing chamber 24. Under the action of the arc extinguishing grid plate 25 and the arc extinguishing groove 26, the electric arc is divided into small segments to achieve rapid arc extinguishing.

[0062] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A circuit breaker characterized by, include: case, An arc-extinguishing system is disposed inside the housing. The arc-extinguishing system includes: an arc-initiating plate, a first magnetically conductive plate, an arc-isolating plate, and an arc-extinguishing chamber. Multiple parallel-arranged arc-extinguishing grid plates are disposed within the arc-extinguishing chamber. Each arc-extinguishing grid plate has an arc-extinguishing groove, and the arc-extinguishing grooves of adjacent arc-extinguishing grid plates are staggered. The arc-isolating plate and the first magnetically conductive plate are arranged in parallel, and a cavity is formed between them, with the opening of the cavity facing the arc-extinguishing groove. The arc-initiating plate is located around the arc-extinguishing chamber and the arc-isolating plate. The housing is also provided with a short-circuit protection mechanism, which includes a magnetic yoke, an electromagnetic coil, and a trip unit. The magnetic yoke is sleeved on the outside of the trip unit and is U-shaped. The electromagnetic coil is sleeved on the outside of the trip unit and placed within the U-shaped space of the magnetic yoke. A stationary contact rod is connected to the end of the trip unit, and a stationary contact point is provided on the stationary contact rod. The end of the stationary contact rod with the stationary contact point is hook-shaped, and a hook-shaped second magnetic conductive sheet is provided on the inner side of the hook-shaped end of the stationary contact rod.

2. The circuit breaker of claim 1, wherein The housing is provided with an inlet terminal and an outlet terminal, respectively, and the inlet terminal and the outlet terminal are respectively connected to the wire.

3. The circuit breaker of claim 2, wherein, The end of the electromagnetic coil is connected to an input terminal block, which is connected to the input terminal.

4. The circuit breaker of claim 3, wherein, The trip unit has a push rod inside, and an opening is provided at one end of the trip unit near the stationary contact rod for the push rod to be pushed out.

5. The circuit breaker of claim 4, wherein, The housing also includes a release mechanism comprising: a handle, a tension spring, a connecting rod, a movable contact rod, a lever, and a return spring; the middle portion of the movable contact rod and the middle portion of the lever are rotatably connected coaxially by a rotating shaft, and the rotating shaft is connected to the housing; the return spring is sleeved outside the rotating shaft and abuts against the lever and a fixed shaft, the fixed shaft being connected to the housing; one end of the connecting rod is connected to the handle, and the other end is connected to the movable contact rod, the other end of which is provided with a movable contact point, the movable contact rod swinging to open and close the movable contact point and the stationary contact point; one end of the tension spring is connected to the housing, and the other end is connected to the end of the movable contact rod near the handle.

6. The circuit breaker of claim 5, wherein, The end of the connecting rod away from the handle is connected to a jumper, and the jumper is connected to the moving contact rod.

7. The circuit breaker of claim 6 wherein, An indicator is provided at the connection end between the jump buckle and the moving contact rod, and both the jump buckle and the moving contact rod are rotatably connected to the indicator.

8. The circuit breaker of claim 5 wherein, The housing is also provided with an overload protection mechanism, which includes a tripping rod and a bimetallic strip. One end of the tripping rod is connected to a lever and the other end is connected to the bimetallic strip. One end of the bimetallic strip is connected to a moving contact rod via a wire, and the other end is connected to a wire outlet terminal block via a wire. The wire outlet terminal block is connected to the wire outlet terminal.

9. The circuit breaker of claim 1, wherein, The housing is connected with clips for connecting to external components.

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