Safety circuit breaker capable of isolating electric fire

Abstract

The utility model discloses a safety circuit breaker for isolating electric fire, which belongs to the technical field of circuit breakers, and comprises a circuit breaker shell, wiring terminals connected with a circuit system are respectively arranged on two sides of the circuit breaker shell, a ceramic rotating shaft is attached to and rotatably connected with an inner cavity of the circuit breaker shell, a channel is arranged in the ceramic rotating shaft, and the ceramic rotating shaft is connected with a circuit system. According to the utility model, the ceramic rotating shaft is arranged in the circuit breaker shell, then the protective cover is used for packaging, the position of the channel is adjusted through the rotation of the ceramic rotating shaft, when the channel and the accommodating groove are staggered, the movable terminal is separated from the movable terminal, and the connecting lead is arranged in the inner cavity of the channel. The movable terminals at the two ends are isolated through the ceramic rotating shaft, the isolation protection effect is achieved, after the channel is aligned to the containing groove, the movable terminals and the connecting terminals are tightly attached under supporting of the first supporting springs and the second supporting springs, communication of a circuit is guaranteed, and the safety of the circuit breaker is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a safety circuit breaker for isolating electric fire. Background Art

[0002] A circuit breaker is a switch device that can close, carry and disconnect current under normal circuit conditions and close, carry and disconnect current under abnormal circuit conditions within a specified time. Circuit breakers are divided into high-voltage circuit breakers and low-voltage circuit breakers according to their scope of use. The boundary between high and low voltage is relatively vague, and those above 3kV are generally called high-voltage electrical appliances.

[0003] When a traditional circuit breaker disconnects a circuit, the distance between the two ends of the disconnected circuit will gradually increase. At the moment of disconnection, there will be a tip discharge phenomenon, and then the discharge phenomenon will disappear as the switch is disconnected. When the circuit breaker is in a high-voltage circuit, the tip discharge will produce sparks more frequently, and the sparks will easily cause safety hazards in the circuit breaker. Utility Model Content

[0004] The purpose of the utility model is to provide a safety circuit breaker that isolates electric sparks. The insulating ceramic shaft is located between two active electrons, which can isolate electric sparks. At the same time, a channel with built-in connecting wires and movable terminals is opened inside the ceramic shaft. By rotating the ceramic shaft and adjusting the position of the channel, the connecting wires and the movable terminals can be connected and disconnected, thereby avoiding the generation of electric sparks and improving the safety of the circuit breaker when opening and closing, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a safety circuit breaker for isolating electric fire, comprising a circuit breaker housing, wherein wiring terminals connected to a circuit system are respectively arranged on both sides of the circuit breaker housing, an inner cavity of the circuit breaker housing is fitted and rotatably connected with a ceramic shaft, a channel is provided inside the ceramic shaft, a connecting wire is provided in the inner cavity of the channel, movable terminals are installed at both ends of the connecting wire, a first supporting spring is provided in the channel, and the two ends of the first supporting spring are respectively fitted on the opposite sides of the movable terminal, storage grooves are provided on both sides of the inner cavity of the circuit breaker housing, and a movable terminal electrically connected to the wiring terminal is movably arranged in the inner cavity of the storage groove, an end of the movable terminal away from the first supporting spring passes through the inner cavity of the storage groove and fits with the movable terminal, and a protective cover fitted with the ceramic shaft is installed at the front end of the circuit breaker housing.

[0006] Preferably, a protrusion is integrally formed on the surface of the ceramic shaft, a through groove is provided at the center of the protective cover, and one end of the protrusion away from the ceramic shaft penetrates the through groove and extends outward.

[0007] Preferably, a second supporting spring is fixed to the inner cavity of the receiving groove, and one end of the second supporting spring facing each other is fixedly connected to one side of the movable terminal.

[0008] Preferably, a threaded hole is provided on one side of the movable terminal facing each other, the inner cavity of the threaded hole is threadedly connected to a fastening screw with a pressing piece, and the end of the connecting wire is wrapped around the outside of the fastening screw and limited by the pressing piece.

[0009] Preferably, both ends of the ceramic shaft are fixed with limiting columns, both sides of the inner cavity of the circuit breaker housing are provided with guide grooves, and the limiting columns are located in the inner cavity of the guide grooves.

[0010] Preferably, an arc-shaped chamfer is provided at one end of the movable terminal away from the first supporting spring, and grooves aligned with the movable terminal are provided on both sides of the inner cavity of the circuit breaker housing.

[0011] Preferably, a plurality of countersunk holes are provided around the surface of the protective cover, and mounting screws are movably provided in the countersunk holes. The mounting screws penetrate the protective cover and are threadably connected to the circuit breaker housing.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 1. The utility model places a ceramic shaft inside the circuit breaker housing and then uses a protective cover to encapsulate it. The position of the channel is adjusted by rotating the ceramic shaft. When the channel is misaligned with the storage slot, the movable terminal is separated from the active terminal, and the ceramic shaft isolates the active terminals at both ends to play an isolation and protection role. When the channel is aligned with the storage slot, the active terminal and the connecting terminal are tightly fitted under the support of the first support spring and the second support spring, ensuring the connectivity of the circuit and improving the safety of the circuit breaker.

[0014] 2. The utility model facilitates the rotation of the ceramic shaft and limits the movement of the ceramic shaft by setting the protrusions and grooves, so as to avoid the channel and the storage groove being brought close to each other again due to the rotation of the ceramic shaft after the connection between the connecting wire and the movable terminal is disconnected, resulting in the movable terminal and the movable terminal being close to each other. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0016] Figure 2 It is a schematic diagram of a partially unfolded three-dimensional structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the sectional exploded three-dimensional structure of the ceramic shaft of the utility model;

[0018] Figure 4It is a schematic diagram of the cross-sectional three-dimensional structure of the circuit breaker housing of the utility model;

[0019] Figure 5 It is a three-dimensional structural schematic diagram of the protective cover of the utility model.

[0020] Numbers in the figure: 1. Circuit breaker housing; 2. Wiring terminal; 3. Ceramic shaft; 4. Channel; 5. Connecting wire; 6. Moving terminal; 7. First supporting spring; 8. Storage slot; 9. Movable terminal; 10. Protective cover; 11. Bump; 12. Through slot; 13. Second supporting spring; 14. Fastening screw; 15. Limiting column; 16. Guide slot; 17. Groove; 18. Mounting screw. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0022] The utility model provides Figures 1 to 5 A safety circuit breaker is shown, which can isolate electric fire, and comprises a circuit breaker housing 1. Both sides of the circuit breaker housing 1 are provided with connection terminals 2 connected to the circuit system. The inner cavity of the circuit breaker housing 1 is rotatably connected with a ceramic shaft 3. A channel 4 is provided inside the ceramic shaft 3. A connecting wire 5 is provided in the inner cavity of the channel 4. Both ends of the connecting wire 5 are provided with movable terminals 6. A first supporting spring 7 is provided in the channel 4. Both ends of the first supporting spring 7 are respectively fitted to the opposite sides of the movable terminal 6. Receiving grooves 8 are provided on both sides of the inner cavity of the circuit breaker housing 1. The inner cavity of the receiving groove 8 is movably provided with a movable terminal 9 electrically connected to the connection terminal. One end of the movable terminal 6 away from the first supporting spring 7 passes through the inner cavity of the receiving groove 8 and fits with the movable terminal 9. A protective cover 10 fitted with the ceramic shaft 3 is provided at the front end of the circuit breaker housing 1.

[0023] By placing the ceramic shaft 3 inside the circuit breaker housing 1 and then sealing it with a protective cover 10, the position of the channel 4 is adjusted by rotating the ceramic shaft 3. When the channel 4 is misaligned with the receiving slot 8, the movable terminal 6 is separated from the active terminal 9, and the ceramic shaft 3 isolates the active terminals 9 at both ends to play an isolation and protection role. When the channel 4 is aligned with the receiving slot 8, the active terminal 9 and the connecting terminal are tightly fitted under the support of the first support spring 7 and the second support spring 13, thereby ensuring the connectivity of the circuit and improving the safety of the circuit breaker.

[0024] A protrusion 11 is integrally formed on the surface of the ceramic shaft 3, and a through groove 12 is opened at the center of the protective cover 10. The end of the protrusion 11 away from the ceramic shaft 3 penetrates the through groove 12 and extends outward. The setting of the protrusion 11 facilitates the rotation of the ceramic shaft 3 and the adjustment of the position of the channel 4.

[0025] A second supporting spring 13 is fixed to the inner cavity of the storage groove 8, and the facing end of the second supporting spring 13 is fixedly connected to one side of the movable terminal 9. The second supporting spring 13 is arranged to facilitate supporting the movable terminal 9, and then the movable terminal 9 is fit with the movable terminal 6 to avoid the movable terminal 9 being fixed in position. When the ceramic shaft 3 is rotated, the movable terminal 6 shrinks in the box channel 4, causing the distance between the movable terminal 6 and the movable terminal 9 to gradually increase. During this period, the movable terminal 6 and the movable terminal 9 are not in contact but the distance is too close, which can easily lead to the occurrence of tip discharge and generate electric sparks.

[0026] A threaded hole is provided on the side facing the mobile terminal 6, and the inner cavity of the threaded hole is threadedly connected to a fastening screw 14 with a pressing plate. The end of the connecting wire 5 is wrapped around the outside of the fastening screw 14 and limited by the pressing plate. The connecting wire 5 can be connected to the mobile terminal 6 through the fastening screw 14, and the connecting wire 5 can be easily replaced.

[0027] Limiting columns 15 are fixed at both ends of the ceramic shaft 3, and guide grooves 16 are opened on both sides of the inner cavity of the circuit breaker housing 1. The limiting columns 15 are located in the inner cavity of the guide grooves 16. The limiting columns 15 increase the stability of the ceramic shaft 3 in the inner cavity of the circuit breaker housing 1, so that the ceramic shaft 3 rotates with the limiting columns 15 as the rotation axis, ensuring the alignment of the channel 4 and the receiving groove 8, thereby preventing the movable terminal 6 from being unable to be inserted into the receiving groove 8 and contacting the movable terminal 9.

[0028] An arc-shaped chamfer is provided at one end of the movable terminal 6 away from the first support spring 7, and grooves 17 aligned with the movable terminal 6 are also provided on both sides of the inner cavity of the circuit breaker housing 1. Through the setting of the arc-shaped chamfer, the movable terminal 6 can be quickly retracted into the channel 4 when the ceramic shaft 3 is rotated.

[0029] There are multiple groups of countersunk holes around the surface of the protective cover 10, and mounting screws 18 are movably arranged in the countersunk holes. The mounting screws 18 pass through the protective cover 10 and are threadedly connected to the circuit breaker housing 1. By setting the mounting screws 18, the protective cover 10 can be installed, and the protective cover 10 and the circuit breaker housing 1 are used to limit the ceramic rotating shaft 3.

[0030] During specific use, the ceramic shaft 3 is placed inside the circuit breaker housing 1, and then the limiting column 15 is moved inward along the guide groove 16, and then the protective cover 10 is connected to the circuit breaker housing 1 by installing the screws 18. When the channel 4 is aligned with the storage groove 8, the movable terminal 6 and the movable terminal 9 are fitted together under the support of the first support spring 7 and the second support spring 13, and the connecting terminals 2 on both sides are connected by the connecting wire 5. When the ceramic shaft 3 is driven to rotate by the protrusion 11, the movable terminal 6 shrinks along the arc chamfered box channel 4, and then as the ceramic shaft 3 continues to rotate, when the movable terminal 9 is separated from the movable terminal 6, the two are isolated by the ceramic shaft 3 to avoid discharge and sparks. At the same time, the movable terminal 6 is moved into the groove 17 under the support of the first support spring 7 to limit the ceramic shaft 3.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A safety circuit breaker for isolating electric fire, comprising a circuit breaker housing (1), characterized in that: The circuit breaker housing (1) is provided with connection terminals (2) connected to the circuit system on both sides, the inner cavity of the circuit breaker housing (1) is rotatably connected to a ceramic shaft (3), the ceramic shaft (3) is provided with a channel (4), the inner cavity of the channel (4) is provided with a connecting wire (5), both ends of the connecting wire (5) are provided with movable terminals (6), a first support spring (7) is provided in the channel (4), the two ends of the first support spring (7) are respectively in contact with the opposite sides of the movable terminal (6), the inner cavity of the circuit breaker housing (1) is provided with a receiving groove (8), the inner cavity of the receiving groove (8) is movably provided with a movable terminal (9) electrically connected to the connection terminal, the end of the movable terminal (6) away from the first support spring (7) passes through the inner cavity of the receiving groove (8) and is in contact with the movable terminal (9), and the front end of the circuit breaker housing (1) is provided with a protective cover (10) in contact with the ceramic shaft (3).

2. A safety circuit breaker for isolating electric fire according to claim 1, characterized in that: A protrusion (11) is integrally formed on the surface of the ceramic rotating shaft (3), a through groove (12) is provided at the center of the protective cover (10), and one end of the protrusion (11) away from the ceramic rotating shaft (3) penetrates the through groove (12) and extends outward.

3. The safety circuit breaker for isolating electric fire according to claim 1, characterized in that: A second support spring (13) is fixed in the inner cavity of the receiving groove (8), and one end of the second support spring (13) facing each other is fixedly connected to one side of the movable terminal (9).

4. A safety circuit breaker for isolating electric fire according to claim 1, characterized in that: A threaded hole is provided on one side of the movable terminal (6) facing the other, and a fastening screw (14) with a pressing piece is threadedly connected to the inner cavity of the threaded hole, and the end of the connecting wire (5) is wound around the outside of the fastening screw (14) and is limited by the pressing piece.

5. The safety circuit breaker for isolating electric fire according to claim 1, characterized in that: Limiting columns (15) are fixed at both ends of the ceramic rotating shaft (3), flow guide grooves (16) are provided on both sides of the inner cavity of the circuit breaker housing (1), and the limiting columns (15) are located in the inner cavity of the flow guide grooves (16).

6. A safety circuit breaker for isolating electric fire according to claim 1, characterized in that: An arc-shaped chamfer is provided at one end of the movable terminal (6) away from the first supporting spring (7), and grooves (17) aligned with the movable terminal (6) are provided on both sides of the inner cavity of the circuit breaker housing (1).

7. The safety circuit breaker for isolating electric fire according to claim 1, characterized in that: A plurality of groups of countersunk holes are provided around the surface of the protective cover (10), and mounting screws (18) are movably arranged in the countersunk holes. The mounting screws (18) penetrate the protective cover (10) and are threadedly connected to the circuit breaker housing (1).

Images