Arc extinguishing type total circuit breaker protection structure and distribution box

Abstract

The utility model relates to a circuit breaker protection structure and distribution box, specifically is arc extinguishing type total circuit breaker protection structure and distribution box, including circuit breaker casing and install in circuit breaker casing's circuit breaker switch and rotation connection in circuit breaker switch one end's main contact, the utility model; through setting up arc chamber in circuit breaker bottom, cleverly utilize air compressor mechanism to realize efficient arc extinguishing, when contact is about to contact with arc chamber arc -leading piece or close breaking critical state, the exhaust port of control compressed air mechanism opens synchronously, high pressure compressed air is oriented to blow to arc region, and the arc is cooled through forced convection, improves arc area gas pressure to inhibit ionization, and fast takes away arc gap ionized gas, realizes the preliminary extinguishing of arc; at the same time, the arc produced in the moment of making -up and breaking is introduced into the metal grid piece group in arc chamber through arc -leading structure accurately, and the residual ionized gas is forcedly driven into the grid piece gap, further strengthens arc extinguishing effect.

Description

Technical Field

[0001] This utility model relates to a circuit breaker protection structure and distribution box, specifically an arc-extinguishing type main circuit breaker protection structure and distribution box. Background Technology

[0002] A distribution box is a device in an electrical system used for centralized distribution of electrical energy, control and protection of circuits. It is usually composed of a metal or plastic shell and internal components such as circuit breakers, fuses, residual current devices (RCDs), and terminals. Its core function is to distribute electrical energy from the main power supply to various branch circuits, and at the same time monitor the circuit status through internal circuit breakers. In the event of overload, short circuit, leakage or other faults, the corresponding circuit is cut off to prevent equipment damage or safety accidents.

[0003] The main circuit breaker is the core switching device in a circuit system responsible for controlling and protecting the main power supply. It is installed at the very beginning of the power supply line and is directly connected to the main power supply (such as the grid line). When a serious fault occurs in the circuit (such as a short circuit or a continuous overload), it can quickly cut off the main power supply of the entire system to prevent the fault from spreading to the main grid or causing damage to a wider range of equipment.

[0004] When the contacts of a circuit breaker break the circuit, an electric arc is generated between the contacts. If the arc cannot be extinguished in time, it will continue to burn, causing the contact temperature to rise sharply, and may even cause the contacts to weld together, making it impossible for the circuit breaker to break the circuit normally. Existing circuit breakers are equipped with an arc extinguishing device. When the contacts break the circuit and generate an arc, the arc extinguishing grid, magnetic blow-out coil and other devices in the arc extinguishing chamber are used to divide, lengthen and cool the arc, and finally extinguish the arc, ensuring that the circuit breaker can reliably disconnect the circuit in a very short time.

[0005] Traditional circuit breakers often rely on a single arc-extinguishing method, such as cooling with metal grids or natural air. This results in a slow arc-extinguishing speed and a prolonged arc duration during the contact switching process. High temperatures can easily lead to contact erosion, welding, or even arc gap reignition. Furthermore, traditional structures are poorly adapted to the differences in arc characteristics between the "connection" and "disconnection" stages of a circuit breaker: during connection, the initial arc energy is concentrated but lacks rapid suppression methods; during disconnection, it is difficult to effectively expel ionized gas from the arc gap, leading to problems such as residual ionized gas and incomplete arc extinguishing. Utility Model Content

[0006] The purpose of this utility model is to provide an arc-extinguishing type main circuit breaker protection structure and distribution box to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] An arc-extinguishing type main circuit breaker protection structure includes a circuit breaker housing, a circuit breaker switch installed inside the circuit breaker housing, and a main contact rotatably connected to one end of the circuit breaker switch. A sliding support mechanism and a housing that slides above the sliding support mechanism are installed on the main contact. An air compression mechanism and an exhaust mechanism disposed below the housing are rotatably installed inside the housing. An arc-extinguishing chamber and an arc-extinguishing assembly disposed inside the arc-extinguishing chamber are installed inside the arc-extinguishing chamber. The arc-extinguishing assembly cooperates with the sliding support mechanism.

[0009] The arc-extinguishing main circuit breaker protection structure described above includes: the sliding support mechanism comprising two cylindrical conductors disposed at the bottom of the main contacts and a limiting block disposed at the top of the main contacts; one side of the limiting block is provided with a groove and a bidirectional pressing member disposed on the groove.

[0010] The arc-extinguishing type main circuit breaker protection structure described above: the air compression mechanism includes a rotating shaft rotatably mounted inside the chamber and a cam fixedly connected to the rotating shaft. A piston block is sleeved on the cam, and the piston block is slidably mounted on the inner wall of the chamber.

[0011] The arc-extinguishing type main circuit breaker protection structure described above: the exhaust mechanism includes a limiting sliding seat located at the bottom of the chamber and an exhaust port opened on one side of the limiting sliding seat. An exhaust pipe is installed around the exhaust port at one end of the limiting sliding seat, and a one-way air valve is provided at one end of the chamber that only allows air to enter the chamber.

[0012] The arc-extinguishing type main circuit breaker protection structure described above includes: the exhaust mechanism further includes two sets of guide posts symmetrically installed on the side of the exhaust port and two opening and closing plates that are slidably installed on the two sets of guide posts respectively. A spring is provided between the guide posts and the opening and closing plates. Rollers are rotatably installed at the rear ends of the two opening and closing plates. The bidirectional pressing member is pressed and engaged with the rollers on the two opening and closing plates.

[0013] The arc-extinguishing type main circuit breaker protection structure described above: the top of the main contact is provided with a transmission tooth plate and a gear that meshes with the transmission tooth plate, and the gear is fixedly sleeved on one end of the rotating shaft.

[0014] The arc-extinguishing type main circuit breaker protection structure described above: the arc-extinguishing assembly includes multiple arc-extinguishing grid plates disposed in the arc-extinguishing chamber and two arc-inducing plates disposed at both ends of the arc-extinguishing grid plates. Each of the two arc-inducing plates is provided with an opening, which cooperates with the cylindrical conductor.

[0015] A distribution box includes a distribution box body, and an arc-extinguishing type main circuit breaker protection structure as described above is installed inside.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: by setting an arc-extinguishing chamber at the bottom of the circuit breaker, the air compression mechanism is cleverly used to achieve efficient arc extinguishing. When the contact is about to contact the arc-initiating plate of the arc-extinguishing chamber or is close to the critical state of breaking, the exhaust port of the compressed air mechanism is controlled to open synchronously, and the high-pressure compressed air is blown directionally towards the arc area. The arc is cooled by forced convection, the air pressure in the arc area is increased to suppress ionization, and the free gas in the arc gap is quickly removed, thus achieving the initial extinguishing of the arc. At the same time, the arc generated at the moment of connection and disconnection is accurately guided onto the metal grid plate group in the arc-extinguishing chamber through the arc-initiating structure, and the residual free gas is forcibly driven into the grid plate gap, further enhancing the arc extinguishing effect.

[0017] In this invention, the electric arc is guided to the metal grid at the moment of disconnection and connection, dividing it into multiple segments. Each grid segment is equivalent to an electrode, increasing the electrode voltage drop and ensuring that the arc is reliably extinguished when the AC crosses zero. Combined with the blowing action of compressed air, the cooling of the arc, the pressure increase in the arc zone, and the discharge of free gas are further enhanced, thereby achieving a faster and more thorough arc extinguishing effect, improving the arc extinguishing efficiency of the circuit breaker, extending the service life of the contacts, enhancing the reliability and safety of the circuit breaker, and effectively protecting the circuit and related equipment from arc damage. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the arc-extinguishing type main circuit breaker protection structure.

[0019] Figure 2 This is a schematic diagram of the internal structure of the arc-extinguishing type main circuit breaker protection structure.

[0020] Figure 3 This is a schematic diagram of the circuit breaker housing structure in the arc-extinguishing main circuit breaker protection structure.

[0021] Figure 4 This is a schematic diagram of the internal structure of the circuit breaker housing in the arc-extinguishing main circuit breaker protection structure.

[0022] Figure 5 This is a schematic diagram of the cross-sectional structure of the circuit breaker housing in the protection structure of an arc-extinguishing main circuit breaker.

[0023] Figure 6 This is a schematic diagram of the air compression mechanism, exhaust mechanism, arc extinguishing components, and sliding support mechanism in the protection structure of an arc-extinguishing main circuit breaker.

[0024] Figure 7 This is a schematic diagram of the arc-extinguishing components and sliding support mechanism in the protection structure of an arc-extinguishing main circuit breaker.

[0025] Figure 8 This is a schematic diagram of the internal structure of the air compression mechanism and exhaust mechanism in the protection structure of an arc-extinguishing main circuit breaker.

[0026] Figure 9 For the protection structure of arc-extinguishing type main circuit breaker Figure 8 Enlarged structural diagram of section A.

[0027] Figure 10 This is a schematic diagram of the sliding support mechanism and the exhaust mechanism in the protection structure of an arc-extinguishing main circuit breaker.

[0028] In the diagram: 1. Distribution box body; 2. Circuit breaker housing; 3. Circuit breaker switch; 4. Main contacts; 5. Cylindrical conductor; 6. Arc extinguishing chamber; 7. Arc extinguishing grid; 8. Arc ignition plate; 9. Limiting block; 10. Bidirectional extrusion component; 11. Chamber body; 12. Rotating shaft; 13. Cam; 14. Piston block; 15. One-way air valve; 16. Limiting sliding seat; 17. Guide column; 18. Opening and closing plate; 19. Spring; 20. Transmission gear plate; 21. Gear; 22. Exhaust pipe. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Please see Figures 1-10 As an embodiment of this utility model, the arc-extinguishing main circuit breaker protection structure includes a circuit breaker housing 2, a circuit breaker switch 3 installed inside the circuit breaker housing 2, and a main contact 4 rotatably connected to one end of the circuit breaker switch 3. A sliding support mechanism and a chamber 11 sliding above the sliding support mechanism are installed on the main contact 4. An air compression mechanism and an exhaust mechanism disposed below the chamber 11 are rotatably installed inside the chamber 11. An arc-extinguishing chamber 6 and an arc-extinguishing assembly disposed inside the arc-extinguishing chamber 6 are installed inside the circuit breaker housing 2. The arc-extinguishing assembly cooperates with the sliding support mechanism.

[0031] In this embodiment, by setting an arc-extinguishing chamber 6 at the bottom of the circuit breaker, during the movement of the main contact 4 of the circuit breaker, the main contact 4 will synchronously drive the sliding support mechanism to move. At this time, the sliding support mechanism will drive the air compression mechanism in the opposite direction. During this process, the air compression mechanism will continuously compress the external air into the chamber 11. Then, when the main contact 4 is about to contact or approach the critical state of the arc-extinguishing component of the arc-extinguishing chamber 6, the exhaust mechanism on the chamber 11 is controlled to open synchronously, blowing high-pressure compressed air in a direction towards the arc area. By forced convection cooling the arc, increasing the air pressure in the arc area to suppress ionization, and quickly removing the free gas in the arc gap, the arc is initially extinguished. At the same time, the arc generated at the moment of connection and disconnection is accurately guided into the arc-extinguishing component in the arc-extinguishing chamber 6 through the arc-initiating structure, forcibly driving the residual free gas into the arc-extinguishing component, further enhancing the arc-extinguishing effect.

[0032] As a further embodiment of this utility model, the sliding support mechanism includes two cylindrical conductors 5 disposed at the bottom of the main contact 4 and a limiting block 9 disposed at the top of the main contact 4. A groove is provided on one side of the limiting block 9 and a bidirectional extrusion member 10 is disposed on the groove.

[0033] In this embodiment, the main contact 4 can conduct the electric arc to the cylindrical conductor 5, the limiting block 9 is set on the top of the main contact 4, and the upper and lower ends of the bidirectional extrusion member 10 are both designed with bevels.

[0034] As a further embodiment of the present invention, the air compression mechanism includes a rotating shaft 12 rotatably mounted inside the chamber 11 and a cam 13 fixedly connected to the rotating shaft 12. A piston block 14 is sleeved on the cam 13 and the piston block 14 is slidably mounted on the inner wall of the chamber 11.

[0035] In this embodiment, the piston block 14 is slidably mounted on the inner wall of the chamber 11. When the rotating shaft 12 rotates, it will synchronously drive the cam 13 and the piston block 14 to rotate, thereby causing the piston block 14 to swing up and down, introducing external gas into the chamber 11 and compressing the air.

[0036] As a further embodiment of this utility model, the exhaust mechanism includes a limiting sliding seat 16 disposed at the bottom of the chamber 11 and an exhaust port opened on one side of the limiting sliding seat 16. An exhaust pipe 22 is installed around the exhaust port at one end of the limiting sliding seat 16, and a one-way air valve 15 is provided at one end of the chamber 11, which only allows air to enter the chamber 11.

[0037] In this embodiment, the limiting sliding seat 16 is located below the chamber 11, and an exhaust pipe 22 is provided outside the exhaust port. Gas is discharged into a designated area through the exhaust pipe 22, and external gas is introduced into the chamber 11 through the one-way valve 15. Gas inside the chamber 11 cannot be discharged outward through the one-way valve 15.

[0038] As a further embodiment of this utility model, the exhaust mechanism also includes two sets of guide posts 17 symmetrically installed on the side of the exhaust port and two opening and closing plates 18 respectively slidably installed on the two sets of guide posts 17. A spring 19 is provided between the guide posts 17 and the opening and closing plates 18. Rollers are rotatably installed at the rear ends of the two opening and closing plates 18. The bidirectional extrusion member 10 is in extrusion cooperation with the rollers on the two opening and closing plates 18.

[0039] In this embodiment, two slidable opening and closing plates 18 are provided on the exhaust port, and the spring 19 elastically resets the opening and closing plates 18.

[0040] As a further embodiment of this utility model, the top of the main contact 4 is provided with a transmission tooth plate 20 and a gear 21 that meshes with the transmission tooth plate 20, and the gear 21 is fixedly sleeved on one end of the rotating shaft 12.

[0041] In this embodiment, the transmission gear plate 20 meshes with the gear 21, and the rotation of the gear 21 will synchronously drive the rotating shaft 12 to rotate.

[0042] As a further embodiment of this utility model, the arc extinguishing assembly includes a plurality of arc extinguishing grid plates 7 disposed in the arc extinguishing chamber 6 and two arc-inducing plates 8 disposed at both ends of the arc extinguishing grid plates 7. Each of the two arc-inducing plates 8 is provided with an opening, which cooperates with the cylindrical conductor 5.

[0043] In this embodiment, when the main contact 4 of the circuit breaker is activated, it first drives the transmission gear plate 20 to move. The transmission gear plate 20 then drives the gear 21 to rotate, which in turn drives the rotating shaft 12 to rotate. This causes the piston block 14 to move repeatedly inside the chamber 11, drawing in external air and compressing it continuously. Subsequently, when the main contact 4 is about to contact the arc-starting plate 8 or is close to the critical breaking state, the bidirectional pressing member 10 on the limiting block 9 will press the rollers at the rear ends of the two opening and closing plates 18 towards both ends, thereby driving the two opening and closing plates 18 to move towards both ends. 8 is opened, and the spring 19 is compressed. At this time, the exhaust port on one side of the limit sliding seat 16 is opened simultaneously. At this time, high-pressure compressed air is blown directionally to the arc area through the exhaust pipe 22. The arc is cooled by forced convection, the air pressure in the arc area is increased to suppress ionization, and the free gas in the arc gap is quickly removed, so as to achieve the initial extinguishing of the arc. At the same time, the arc generated at the moment of connection and disconnection is accurately guided to the arc extinguishing grid plate 7 in the arc extinguishing chamber 6 through the arc ignition plate 8, and the residual free gas is forced into the gap of the arc extinguishing grid plate 7 to further enhance the arc extinguishing effect.

[0044] A distribution box includes a distribution box body 1, and the distribution box body 1 is equipped with an arc-extinguishing type main circuit breaker protection structure as described above.

[0045] The above embodiments are exemplary and not restrictive. Therefore, without departing from the spirit or basic characteristics of this utility model, any technical solutions that can be implemented in other specific forms are included in this utility model.

Claims

1. An arc-extinguishing type main circuit breaker protection structure, comprising a circuit breaker housing (2), a circuit breaker switch (3) installed inside the circuit breaker housing (2), and a main contact (4) rotatably connected to one end of the circuit breaker switch (3), characterized in that, The main contact (4) is equipped with a sliding support mechanism and a housing (11) that slides above the sliding support mechanism. An air compression mechanism and an exhaust mechanism located below the housing (11) are rotatably installed inside the housing (11). An arc-extinguishing chamber (6) and an arc-extinguishing assembly located inside the arc-extinguishing chamber (6) are installed inside the circuit breaker housing (2). The arc-extinguishing assembly cooperates with the sliding support mechanism.

2. The arc-extinguishing type main circuit breaker protection structure according to claim 1, characterized in that, The sliding support mechanism includes two cylindrical conductors (5) disposed at the bottom of the main contact (4) and a limiting block (9) disposed at the top of the main contact (4). A groove is provided on one side of the limiting block (9) and a bidirectional extrusion member (10) is disposed on the groove.

3. The arc-extinguishing type main circuit breaker protection structure according to claim 2, characterized in that, The air compression mechanism includes a rotating shaft (12) rotatably installed inside the chamber (11) and a cam (13) fixedly connected to the rotating shaft (12). A piston block (14) is sleeved on the cam (13) and the piston block (14) is slidably installed on the inner wall of the chamber (11).

4. The arc-extinguishing type main circuit breaker protection structure according to claim 3, characterized in that, The exhaust mechanism includes a limiting sliding seat (16) located at the bottom of the chamber (11) and an exhaust port located on one side of the limiting sliding seat (16). An exhaust pipe (22) is installed around the exhaust port at one end of the limiting sliding seat (16). A one-way air valve (15) is provided at one end of the chamber (11) that only allows air to enter the chamber (11).

5. The arc-extinguishing type main circuit breaker protection structure according to claim 4, characterized in that, The exhaust mechanism also includes two sets of guide posts (17) symmetrically installed on the side of the exhaust port and two opening and closing plates (18) respectively slidably installed on the two sets of guide posts (17). A spring (19) is provided between the guide posts (17) and the opening and closing plates (18). Rollers are rotatably installed at the rear ends of the two opening and closing plates (18). The bidirectional extrusion member (10) is in extrusion cooperation with the rollers on the two opening and closing plates (18).

6. The arc-extinguishing type main circuit breaker protection structure according to claim 5, characterized in that, The top of the main contact (4) is provided with a transmission tooth plate (20) and a gear (21) that meshes with the transmission tooth plate (20). The gear (21) is fixedly sleeved on one end of the rotating shaft (12).

7. The arc-extinguishing type main circuit breaker protection structure according to claim 6, characterized in that, The arc extinguishing assembly includes multiple arc extinguishing grid plates (7) disposed in the arc extinguishing chamber (6) and two arc-inducing plates (8) disposed at both ends of the arc extinguishing grid plates (7). Both arc-inducing plates (8) are provided with openings, which cooperate with the cylindrical conductor (5).

8. A distribution box, comprising a distribution box body (1), characterized in that, The distribution box body (1) is equipped with an arc-extinguishing type main circuit breaker protection structure as described in any one of claims 1-7.

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