Arc-free circuit breaker

Abstract

According to the technical scheme, the arc-free circuit breaker comprises a circuit breaker shell, a control module, a motor holding relay and a silicon controlled rectifier are arranged in the circuit breaker shell, the motor holding relay and the silicon controlled rectifier are electrically connected with the control module, and the motor holding relay and the silicon controlled rectifier are connected in parallel; the motor holding relay comprises a wire inlet electrode and a wire outlet electrode, the silicon controlled rectifier is electrically connected with the wire outlet electrode through a silicon controlled rectifier electrode, the wire outlet electrode is connected with an elastic steel reed, the end, provided with a wire inlet contact, of the wire inlet electrode is arranged on one side of the steel reed, and the steel reed can be tightly attached to or separated from the wire inlet contact through a driving mechanism. The motor holding relay is connected with the silicon controlled rectifier in parallel, the power-on time of the silicon controlled rectifier is controlled through the motor holding relay and the control module, switching-on and switching-off of the motor holding relay are completed within the conduction time of the silicon controlled rectifier, and switching-on and switching-off of the motor holding relay within the conduction time of the silicon controlled rectifier do not generate electric arcs. The burns of the outlet end of the relay in the prior art are reduced or avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to an arc-free circuit breaker. Background Art

[0002] The relay in the circuit breaker is a normal carrier of the load, with the characteristics of low heat generation and stable operation. However, it has a fatal flaw, that is, an arc will be generated at the moment of breaking, causing contact burns, thus seriously affecting the life of the switch; the thyristor is a semiconductor material, which has sensitive current on-off control and no mechanical opening and closing structure. It will not generate an arc when switching on and off the current, but it also has a fatal problem, that is, it generates serious heat during operation. At the same time, it will generate energy loss when it is on, causing energy waste, and is not suitable for long-term operation.

[0003] In addition, traditional electromagnetic relays and magnetic latching relays also have many problems: when the electromagnetic relay is closed, the magnetic force of the electromagnet needs to be maintained, so it needs to be powered on continuously, which will cause serious heat generation and energy waste; magnetic latching relays solve this problem through permanent magnets, but permanent magnets will lose magnetism when the temperature rises, causing the magnetic attraction to decrease and tripping to occur, seriously affecting the stability and safety of equipment operation. When there is more severe mechanical vibration, the permanent magnet will also be attracted and disconnected, and the switch will trip and close alternately, which is even more dangerous. Utility Model Content

[0004] In order to solve the technical problems existing in the above-mentioned background technology, the utility model provides an arc-free circuit breaker, which achieves the effects of no arc, low heat generation, no power loss, no influence of temperature rise, stable and reliable operation, etc.

[0005] The technical solution of this utility model is as follows:

[0006] An arc-free circuit breaker comprises a circuit breaker housing, wherein a control module and a motor holding relay and a thyristor electrically connected to the control module are arranged in the circuit breaker housing, and the motor holding relay and the thyristor are connected in parallel;

[0007] The motor holding relay includes an incoming line electrode and an outgoing line electrode, the thyristor is electrically connected to the outgoing line electrode through the thyristor electrode, the outgoing line electrode is connected to an elastic steel reed, one end of the incoming line electrode provided with an incoming line contact is arranged on one side of the steel reed, and the side of the steel reed close to the incoming line contact can be closely attached to or separated from the incoming line contact through a driving mechanism;

[0008] The driving mechanism includes a driving motor and a gear swing arm arranged on one side of the circuit breaker housing. The output end of the driving motor is connected to the swing arm through a gear set. The middle part of the gear swing arm is hinged to the inner wall of the circuit breaker housing, and one end of the gear swing arm is connected to the side of the steel spring away from the incoming contact. The other end is provided with a tooth segment, which is meshed with the gear set.

[0009] The motor holding relay is connected in parallel with the thyristor. The energization time of the thyristor can be controlled through the motor holding relay and the control module. The closing and opening of the motor holding relay are completed within the conduction time of the thyristor. During the conduction period of the thyristor, the closing and opening of the motor holding relay will not generate electric arcs, reducing or avoiding the burning of the contacts of the relay in the prior art, and the thyristor does not need to conduct for a long time to avoid overheating. The opening and closing of the motor holding relay are controlled by driving the motor to drive the gear swing arm to control the copper reed to conduct or disconnect. This can avoid the phenomenon that the motor holding relay cannot open and close normally due to high temperature.

[0010] The specific model of the above-mentioned motor holding relay is that the motor holding relay is a time-delay relay, and the delay time is 10 - 100 ms.

[0011] Regarding the structure of the gear set, the gear set includes a meshing worm and worm gear. The worm is connected to the output end of the driving motor. The worm gear is rotatably connected to one side inside the circuit breaker housing and meshes with the tooth section of the gear swing arm through a reduction gear coaxially connected to it.

[0012] The specific structure of the above-mentioned gear swing arm is that the gear swing arm includes a first sector plate and a second sector plate located in the same plane and integrally formed. One end of the first sector plate close to its center and one end of the second sector plate close to its center are connected, and the connection is rotatably connected to the circuit breaker housing through a rotating shaft. The tooth section is arranged along the arc edge of the second sector plate.

[0013] Regarding the structure of the first sector plate, the first sector plate is arranged close to the copper reed. The first sector plate has an arc surface, and the arc surface is arranged on the lower surface close to the copper reed. The arc surface is convenient for installing the reed connecting piece on it.

[0014] The installation position of the above-mentioned reed connecting piece is that a circular hole concentric with the arc surface is provided on one side of the first sector plate close to the arc surface. A reed connecting piece is rotatably connected in the circular hole. The end of the reed connecting piece close to the copper reed is in sliding contact with the copper reed. The first sector plate swings under the drive of the gear set, and then drives the end of the steel reed passing through it to move closer to or away from the incoming line contact, realizing the electrical connection or disconnection between the incoming line contact and the outgoing line contact.

[0015] To avoid that the thickness from the sliding hole to the end of the reed connecting piece away from the first sector plate is relatively thick, resulting in the outgoing line contact not being able to fit well with the incoming line contact. For this reason, an outgoing line contact is provided on the side of the steel reed close to the incoming line contact. A sliding hole for sliding contact with the copper reed is provided on the reed connecting piece, and the thickness from the sliding hole to the end of the reed connecting piece away from the first sector plate is not greater than the thickness of the outgoing line contact.

[0016] To facilitate the second sector plate to drive the first sector plate to achieve a larger swing range under the drive of the reduction gear, the radius of the first sector plate is set to be 1 / 3 - 2 / 3 of the radius of the second sector plate.

[0017] The beneficial effects of the present utility model are as follows:

[0018] The motor holding relay and the thyristor are in a parallel state; when closing, the control module inputs a positive control voltage to the control terminal of the thyristor, and the thyristor conducts without arc generation. At this time, the thyristor serves as a load carrier, and the entire circuit breaker is in a conducting state, and the thyristor starts to heat up; after a 50 ms delay, the control module controls the motor holding relay to close. Because it is in parallel with the thyristor and the thyristor has been conducting in advance, no arc will be generated when the motor holding relay closes, and the incoming and outgoing contacts of the motor holding relay will not be burned;

[0019] After the motor holding relay closes, the system will detect its closing state. After detecting successful closing, a reverse control voltage is output to the thyristor, and the thyristor disconnects without arc generation, and the thyristor stops heating. The relay serves as a load carrier, and no arc is generated during the entire closing and operation process. The heating time of the thyristor is about 50 ms, and the heat generation is extremely small;

[0020] When opening, the control module outputs a positive voltage to the thyristor, and the thyristor is in a conducting state. At this time, both the thyristor and the motor holding relay are in a conducting state. After the thyristor conducts for 50 ms, the control module controls the motor holding relay to open. Because the thyristor and the motor holding relay are in parallel and have been connected in advance, no arc will be generated when the motor holding relay opens. The control module controls the thyristor to disconnect without arc generation, and the thyristor stops heating. At this time, both the thyristor and the motor holding relay are in a disconnected state, and the circuit breaker opens successfully. No arc is generated during the entire process. The heating time of the thyristor is about 50 ms, and the heat generation is extremely small;

[0021] The driving motor drives the gear swing arm to swing through the gear set. The first sector plate of the gear swing arm drives the reed connecting piece thereon to move, so that the copper reed inside can closely adhere to or disengage from the incoming contact, and the opening and closing of the motor holding relay are realized by controlling the conduction or disconnection of the copper reed. The movement of this mechanical structure can avoid the phenomenon that the magnetic attraction structure of the motor holding relay cannot open and close normally due to high temperature. Description of the Drawings

[0022] In the drawings:

[0023] Figure 1 is a structural schematic diagram;

[0024] Figure 2 is Figure 1 the first internal structural schematic diagram of

[0025] Figure 3 is Figure 1 the second internal structural schematic diagram of

[0026] Figure 4 is a schematic diagram of the first sectional structure;

[0027] Figure 5 is a schematic diagram of the internal structure in the closed state;

[0028] Figure 6 is a schematic diagram of the internal structure in the open state;

[0029] Figure 7 is a schematic diagram of the connection structure of the gear swing arm and the reed connector;

[0030] The components represented by the reference numerals in the figure are:

[0031] 1. Radiator; 2. First cover; 3. Second cover; 4. Pressure terminal; 5. Motor holding relay; 6. Current transformer; 7. Outlet electrode; 8. Thyristor electrode; 9. PBT insulation block; 10. Reed connector; 1001. Sliding contact hole; 11. Thyristor; 12. Inlet electrode; 13. Inlet contact; 14. Outlet contact; 15. Copper reed; 16. Worm; 17. Reduction gear; 18. Driving motor; 19. Gear swing arm; 1901. First sector plate; 1902. Second sector plate; 1903. Tooth section. Detailed implementation

[0032] Refer to Figure 1 , Figure 2 and Figure 3 As shown, an arc-free circuit breaker includes a circuit breaker housing. Pressure terminals 4 are provided on both sides of the circuit breaker housing for crimping the phase wire and the neutral wire. A control module and a motor holding relay 5, a thyristor 11, and a current transformer 6 that are electrically connected thereto are provided inside the circuit breaker housing. The motor holding relay 5 is a constant carrier of the power load, and the current transformer 6 is used for monitoring information such as current and power in the circuit. The above is the prior art, and the motor holding relay 5 and the thyristor 11 are connected in parallel.

[0033] The circuit breaker housing includes a first cover 2 and a second cover 3. Two first covers 2 are symmetrically arranged on both sides of the circuit breaker. A radiator 1 is provided on one side of the first cover 2 for quickly dissipating the temperature generated during the operation of the thyristor 11.

[0034] The specific model of the motor holding relay 5 is that the motor holding relay 5 is a time delay relay with a time delay of 10-100ms. The motor holding relay 5 includes an incoming line electrode 12 and an outgoing line electrode 7, and a PBT insulating block 9 is provided between the outgoing line electrode 7 and the heat sink 1 for electrical insulation. The thyristor 11 includes a thyristor electrode 8, and the thyristor 11 is electrically connected to the outgoing line electrode 7 through the thyristor electrode 8, and the outgoing line electrode 7 is connected to an elastic steel reed. The incoming line electrode 12 is provided with an end of an incoming line contact 13 arranged on one side of the steel reed, and the side of the steel reed close to the incoming line contact 13 can be closely attached to or separated from the incoming line contact 13 through a driving mechanism.

[0035] See also Figure 4 , Figure 5 and Figure 6 As shown, the driving mechanism includes a driving motor 18 and a gear swing arm 19 arranged on one side of the circuit breaker housing. The output end of the driving motor 18 is connected to the swing arm through a gear set. The middle part of the gear swing arm 19 is hinged to the inner wall of the circuit breaker housing, and one end of the gear swing arm 19 is connected to the side of the steel spring away from the incoming contact 13, and the other end is provided with a tooth segment 1903, which is meshed with the reduction gear 17 of the gear set.

[0036] Regarding the structure of the gear set, the gear set includes a meshing worm 16 and a worm wheel. The worm 16 is connected to the output end of the drive motor 18. The worm wheel is rotatably connected to one side of the circuit breaker housing and meshes with the tooth segment 1903 of the gear swing arm 19 through the coaxial reduction gear 17. The reduction gear 17 is a prior art and is not described here. The specific structure of the above-mentioned gear swing arm 19 is that the gear swing arm 19 includes a first sector plate 1901 and a second sector plate 1902 that are located in the same plane and are integrally formed. The end of the first sector plate 1901 close to the center of the circle is connected to the end of the second sector plate 1902 close to the center of the circle, and the connection is rotatably connected to the circuit breaker housing through a rotating shaft. The tooth segment is arranged along the arc edge of the second sector plate 1902.

[0037] See also Figure 7 As shown, the structure of the above-mentioned first fan-shaped plate 1901 is that the first fan-shaped plate 1901 is arranged close to the copper reed 15, and the first fan-shaped plate 1901 has an arcuate surface, and the arcuate surface is arranged close to the lower surface of the copper reed 15. The arcuate surface facilitates the rapid opening of a through hole at the center of the arcuate surface on the first fan-shaped plate 1901, and a pin shaft for connecting the reed connector 10 is passed through the through hole, so that the reed connector 10 is rotatably connected to the first fan-shaped plate 1901, so that when the first fan-shaped plate 1901 is driven to swing by the gear set, it can drive the reed connector 10 to move, so that one end of the copper reed 15 in the reed connector 10 can quickly cling to or detach from the incoming contact 13.

[0038] Specifically, the installation position of the reed connector 10 is as follows: a circular hole concentric with the arc surface is provided on the side of the first sector plate 1901 close to the arc surface. The reed connector 10 is rotatably connected in the circular hole. The end of the reed connector 10 close to the copper reed 15 is in sliding connection with the copper reed 15. The first sector plate 1901 swings driven by the gear set, thereby driving the end of the steel reed passing through it to approach or move away from the incoming line contact 13, realizing the electrical connection or disconnection between the incoming line contact 13 and the outgoing line contact.

[0039] To prevent the thickness from the sliding hole 1001 to the end of the reed connector 10 far from the first sector plate 1901 from being relatively thick, resulting in the outgoing line contact 14 not fitting well with the incoming line contact 13. Therefore, an outgoing line contact 14 is provided on the side of the steel reed close to the incoming line contact 13. A sliding hole 1001 for sliding connection with the copper reed 15 is provided on the reed connector 10. The thickness from the sliding hole 1001 to the end of the reed connector 10 far from the first sector plate 1901 is not greater than the thickness of the outgoing line contact 14.

[0040] To facilitate the second sector plate 1902 to drive the first sector plate 1901 to achieve a larger swing range driven by the reduction gear 17, the radius of the first sector plate 1901 is set to be 1 / 3 - 2 / 3 of the radius of the second sector plate 1902.

[0041] The motor holding relay 5 in this embodiment is in a parallel state with the thyristor 11; when closing, the control module inputs a positive control voltage to the control end of the thyristor 11, and the thyristor 11 conducts without arc generation. At this time, the thyristor 11 serves as a load carrier, and the entire circuit breaker is in a conducting state, and the thyristor 11 starts to heat up; the delay time of the time delay relay in this embodiment is set to 50 ms. After 50 ms of delay, the control module controls the motor holding relay 5 to close. Because it is in parallel with the thyristor 11 and the thyristor 11 has been conducting in advance, no arc will be generated when the relay closes, and it will not cause burns to the incoming line contact 13 and the outgoing line contact 14 of the motor holding relay 5;

[0042] After the motor holding relay 5 closes, the system will detect its closing state. After detecting successful closing, a reverse control voltage is output to the thyristor 11, and the thyristor 11 disconnects without arc generation, and the thyristor 11 stops heating. The relay serves as a load carrier, and no arc is generated during the entire closing and operation process. The heating time of the thyristor 11 is about 50 ms, and the heat generation is extremely small;

[0043] When tripping, the control module outputs a positive voltage to the thyristor 11. The thyristor 11 is in the conducting state. At this time, both the thyristor 11 and the motor holding relay 5 are in the conducting state. After the thyristor 11 conducts for 50 ms, the control module controls the motor holding relay 5 to trip. Since the thyristor 11 and the motor holding relay 5 are in parallel and have been connected in advance, no arc will be generated when the motor holding relay 5 trips. The control module controls the thyristor 11 to disconnect without arc generation, and the thyristor 11 stops heating. At this time, both the thyristor 11 and the relay are in the disconnected state, and the circuit breaker trips successfully. No arc is generated during the whole process. The heating time of the thyristor 11 is about 50 ms, and the heat generation is extremely small.

[0044] The driving motor 18 drives the gear swing arm 19 to swing through the gear set. The first sector plate 1901 of the gear swing arm 19 drives the reed connecting piece 10 thereon to move, so that the copper reed 15 therein can closely contact or separate from the incoming line contact 13, and the on / off of the motor holding relay 5 is controlled by controlling the conduction or disconnection of the copper reed 15. The action of this mechanical structure can avoid the phenomenon that the magnetic attraction structure of the motor holding relay 5 cannot be normally opened and closed due to high temperature.

Claims

1. An arc-free circuit breaker, comprising a circuit breaker housing, characterized in that: A control module and a motor holding relay (5) and a thyristor (11) electrically connected thereto are provided in the circuit breaker housing, and the motor holding relay (5) and the thyristor (11) are connected in parallel; The motor holding relay (5) comprises an incoming line electrode (12) and an outgoing line electrode (7), the thyristor (11) is electrically connected to the outgoing line electrode (7) via the thyristor electrode (8), the outgoing line electrode (7) is connected to an elastic steel reed, one end of the incoming line electrode (12) having an incoming line contact (13) is arranged on one side of the steel reed, and the side of the steel reed close to the incoming line contact (13) can be closely attached to or separated from the incoming line contact (13) through a driving mechanism; The driving mechanism comprises a driving motor (18) and a gear swing arm (19) arranged on one side of the inside of the circuit breaker housing, wherein the output end of the driving motor (18) is transmission-connected to the swing arm via a gear set, the middle part of the gear swing arm (19) is hinged to the inner wall of the circuit breaker housing, one end of the gear swing arm (19) is connected to the side of the steel spring sheet away from the incoming line contact (13), and the other end is provided with a tooth segment (1903), which meshes with the gear set.

2. The arc-free circuit breaker according to claim 1, characterized in that: The motor holding relay (5) is a time-delay relay, and the time-delay time is 10-100ms.

3. The arc-free circuit breaker according to claim 1, characterized in that: The gear set comprises a meshing worm (16) and a worm wheel, wherein the worm (16) is connected to the output end of the driving motor (18), and the worm wheel is rotationally connected to one side of the circuit breaker housing and meshes with the tooth segment (1903) of the gear swing arm (19) through a coaxial reduction gear (17).

4. The arc-free circuit breaker according to claim 3, characterized in that: The gear swing arm (19) comprises a first sector plate (1901) and a second sector plate (1902) which are located in the same plane and are integrally formed, one end of the first sector plate (1901) close to the center of the circle is connected to one end of the second sector plate (1902) close to the center of the circle, and the connection is rotatably connected to the circuit breaker housing through a rotating shaft, and the tooth segment (1903) is arranged along the arc edge of the second sector plate (1902).

5. The arc-free circuit breaker according to claim 4, characterized in that: The first fan-shaped plate (1901) is arranged close to the copper reed (15), and the first fan-shaped plate (1901) has an arc-shaped surface, and the arc-shaped surface is arranged close to the lower surface of the copper reed (15).

6. An arc-free circuit breaker according to claim 4 or 5, characterized in that: A circular hole concentric with the arcuate surface is provided on one side of the first sector plate (1901) close to the arcuate surface, a spring connector (10) is rotatably connected in the circular hole, and the end of the spring connector (10) close to the copper spring (15) is in sliding contact with the copper spring (15).

7. The arc-free circuit breaker according to claim 6, characterized in that: An outgoing line contact (14) is provided on one side of the steel spring sheet close to the incoming line contact (13); a sliding hole (1001) for slidingly contacting the copper spring sheet (15) is provided on the spring sheet connector (10); and the thickness from the sliding hole (1001) to the spring sheet connector (10) away from the first fan-shaped plate (1901) is not greater than the thickness of the outgoing line contact (14).

8. The arc-free circuit breaker according to claim 4, characterized in that: The radius of the first sector plate (1901) is 1 / 3-2 / 3 of the radius of the second sector plate (1902).

Images