Circuit breaker

Abstract

The invention provides a circuit breaker. The circuit breaker at least comprises an insulating shell and an internal element, the internal elements at least comprise an operating handle, a connecting rod, a moving contact support, a moving contact, a static contact, an arc extinguish chamber, a tripping device and a fault protection device, the moving contact support is at least provided with the moving contact and the tripping device, and the moving contact support is arranged in the middle of the insulating shell in a manner of rotating or longitudinally moving along a Y axis; at least one linkage connecting rod is arranged between the operating handle and the tripping device on the moving contact support, and the linkage connecting rod is arranged in a longitudinal movement mode. According to the circuit breaker, the operating handle is located at the top of the circuit breaker, the opening and closing distance of the moving contact is large, and the tripping device is arranged on the moving contact support, so that the opening and closing speed is high, and the breaking capacity and the safety of the circuit breaker are improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] The photovoltaic DC high-voltage circuit breakers of the prior art generally adopt the form of multi-pole circuit breakers assembled in series to achieve more break points to meet the high voltage use conditions. They are large in size, low in safety, high in power consumption and uneconomical. The multi-pole circuit breaker action linkage has an action time deviation, which easily causes a certain pole circuit breaker to burn out too much and cause the entire product to fail. On the other hand, the operating handle in the prior art drives the connecting rod to be arranged in the X-axis direction, and the moving contact support is set at the upper position of the insulating shell. The moving contact is driven by the eccentric swing structure to form a small range of swing. This design makes the swing of the moving contact small, and the contact opening distance cannot be increased in a limited space. During the opening and closing process of the circuit breaker, the arc generated is large, so the safety of the circuit breaker cannot be guaranteed. Summary of the invention

[0003] Based on the above background, the present invention provides a circuit breaker, in which the operating handle is located at the top of the circuit breaker, the opening and closing spacing of the moving contacts is large, the opening and closing speed is fast, the power-off setting is reasonable, and the opening and closing efficiency and safety are improved.

[0004] The technical solution of the present invention is as follows:

[0005] At least it includes an insulating shell and internal components; the internal components at least include an operating handle, a connecting rod, a moving contact support, a moving contact, a static contact, an arc extinguishing chamber, a tripping device, and a fault protection device. The moving contact support is provided with at least the moving contact and the tripping device. The moving contact support is arranged in the middle of the insulating shell in a manner of rotational movement or longitudinal movement along the Y axis. At least one linked connecting rod is arranged between the operating handle and the tripping device on the moving contact support, and the linked connecting rod is arranged for longitudinal movement.

[0006] In the above embodiment, the tripping device and the moving contact are arranged on the moving contact support, and rotate together with the moving contact. The moving contact support is operated by connecting the connecting rod with the operating handle arranged on the top to realize the rotational movement of the moving contact, so that the opening and closing stroke of the moving contact is large. The tripping device can complete the tripping unlocking by triggering the moving contact support on the moving contact support to realize the automatic opening of the circuit breaker and realize rapid tripping. The rotatable moving contact support arranged in the middle position carries the moving contact for rotational movement, and two moving contacts can be arranged on both sides at the same time to further increase the opening distance. It has the advantages of compact structure, simple and reliable.

[0007] In some embodiments, the linked connecting rod is at an angle of no more than 25 degrees to the Y-axis.

[0008] In the above embodiment, the operating handle and the tripping device on the moving contact support are connected to the Y-axis through a connecting rod at an angle not greater than 25 degrees. The moving contact support is rotated by rotating the handle to realize the closing and opening operations of the circuit breaker.

[0009] In some embodiments, the insulating housing is provided with at least left, middle, and right width functional areas in the transverse X-axis direction, and the moving contact support is provided in the middle width functional area.

[0010] In the above embodiment, the moving contact support is arranged in the middle position, which is more reasonably arranged as the main functional component, and the remaining functional components are arranged around it to realize the complete circuit breaker function with compact structure and reliable operation and action.

[0011] In some embodiments, the arc extinguishing chamber and / or fault protection device are correspondingly arranged in the left and right width functional areas.

[0012] In the above embodiment, the functional components are selectively arranged according to the functional performance requirements of the product. In the case of a single contact, an arc extinguishing chamber can be set on either the left or right side. In the case of a double contact, arc extinguishing chambers are arranged on both the left and right sides. The modular functional components are selected according to functional requirements.

[0013] In some embodiments, at least upper, middle and lower height functional zones are arranged in the longitudinal Y-axis direction of the insulating housing, and the moving contact support is arranged in the middle height functional zone.

[0014] In the above embodiment, the moving contact support is arranged in the middle position, and various functional components are arranged around the four aspects of the X and Y axes to achieve a reasonable layout.

[0015] In some embodiments, the operating handle is provided in the upper height functional area, and the fault protection device and / or the installation fixture are provided in the upper and lower height functional areas.

[0016] In the above embodiment, the installation fixture is arranged at the bottom to facilitate the installation of the circuit breaker, and the operating handle is arranged at the top to facilitate operation, and the overall layout is compact and reasonable.

[0017] In some embodiments, the arc extinguishing chamber and the fault protection device are respectively provided with connection terminals for connecting conductors on the outside.

[0018] In the above embodiments, the connection terminal is a component electrically connected to the outside, and being arranged on the outside is more convenient for installation and application.

[0019] In some embodiments, the arc extinguishing chamber is arranged on one side or both sides of the moving contact support. When the arc extinguishing chamber is arranged on both sides of the moving contact support, the fault protection device is arranged above or below the arc extinguishing chamber.

[0020] In the above embodiment, arc extinguishing chambers are arranged on both sides as a double-breakpoint structure, and two series breaks are formed during breaking, which is more conducive to arc extinguishing and improves the breaking capacity. After arc extinguishing chambers are arranged on both sides, fault protection devices are arranged above and below, making the circuit breaker compact and greatly improving the breaking capacity.

[0021] In some embodiments, the fault protection device includes a magnetically operated fault protection device and a thermally operated fault protection device.

[0022] In the above embodiment, the magnetic action fault protection device is combined with the thermal action fault protection device to automatically trip the circuit breaker for overload and short circuit faults, which has a simple structure and low cost.

[0023] In some embodiments, when the magnetically-actuated fault protection device is arranged below the arc extinguishing chamber on the side corresponding to the lower left corner of the insulating shell, the thermally-actuated fault protection device is arranged above the arc extinguishing chamber on the other side corresponding to the upper right corner of the insulating shell; when the magnetically-actuated fault protection device is arranged above the arc extinguishing chamber on the side corresponding to the upper right corner of the insulating shell, the thermally-actuated fault protection device is arranged below the arc extinguishing chamber on the other side corresponding to the lower left corner of the insulating shell.

[0024] In the above embodiment, after the arc extinguishing chamber is positioned, magnetic / thermal action fault protection devices can be set in the upper and lower areas. The regional setting position of the thermal / magnetic action fault protection device makes the layout of the circuit breaker more compact and the volume of the shell smaller.

[0025] In some embodiments, the stationary contact is arranged on one side or both sides of the moving contact support.

[0026] In the above embodiment, the setting of one side or both sides of the static contact determines whether the breaking form of the circuit breaker is a double breakpoint or a single breakpoint. In applications where the performance requirements of the circuit breaker are not high, a single breakpoint structure can be set to reduce the cost. In applications where the performance requirements are high, a double breakpoint structure is set, and the circuit breaker has high breaking performance.

[0027] In some embodiments, a conductor carrying current is arranged corresponding to the moving track of the moving contact.

[0028] In some embodiments, the current direction of the conductor carrying current is opposite to the direction of the arc current generated when the moving contact and the static contact are separated.

[0029] In the above embodiment, a current-carrying conductor is arranged below or above the moving track of the moving contact, and the current on the conductor is opposite to the arc current formed by the opening of the moving and static contacts, so that a Lorentz force is generated between the conductor and the arc. The conductor is in a fixed form, and the Lorentz force is applied to the arc to push the arc toward the arc extinguishing chamber. The Lorentz force generated by its own structure is used to quickly push the arc toward the arc extinguishing chamber, accelerate the arc to enter the arc extinguishing chamber, realize rapid ionization, and improve the breaking capacity.

[0030] In some embodiments, the arc extinguishing chamber is in a straight line shape, an arc line shape, an angle shape, or a combination of the straight line shape, the arc line shape, and the angle shape.

[0031] In the above embodiments, a straight line, an arc line, at least one curved angle, and a combination of these shapes are used for arrangement, so that more grid pieces can be realized in a limited space, and the arc extinguishing effect is better.

[0032] In some embodiments, when the static contact is arranged on a single side of the moving contact support, the moving contact is a single breakpoint, one end of the moving contact is a movable contact portion, and the other end is a fixed soft wire lead-out portion.

[0033] In some embodiments, when the stationary contact is arranged on both sides of the moving contact support, the moving contact has a double breakpoint, and both ends of the moving contact are movable contact parts.

[0034] In the above embodiment, in single breakpoint, one end of the moving contact is in active contact with the static contact, and the other end is indirectly or directly connected to the terminal through the lead-out portion. In double breakpoint, both ends of the moving contact have two break openings formed when disconnected from the active contact portion of the static contact. In applications where the performance requirements of the circuit breaker are not high, a single breakpoint structure can be set to have low cost. In applications where the performance requirements are high, a double breakpoint structure can be set to have high breaking performance of the circuit breaker.

[0035] In some embodiments, the tripping device at least includes a lock buckle, a trip buckle and an elastic element.

[0036] In the above embodiments, the tripping device adopts a locking and jumping structure and is arranged on the moving contact support, which has the characteristics of compact structure and reliable operation.

[0037] In some embodiments, a transfer rod is provided between the tripping device and the fault protection device.

[0038] In the above embodiment, the tripping button serves as a triggering device of the tripping mechanism, is arranged on the moving contact support, performs rotational motion, and is linked with the fault tripping device by a transfer rod to realize the fault tripping device striking the tripping button, thereby realizing the overload and short circuit protection functions.

[0039] In some embodiments, the lock is connected to the connecting rod.

[0040] In the above embodiment, the lock is connected to the connecting rod to realize the closing and opening operations of the moving contact support by operating the handle. The lock arranged on the moving contact support is directly driven by the connecting rod to perform the closing and opening operations, which has the advantages of compact structure and reliable operation.

[0041] In some embodiments, the two ends of the tripping device on the tripping device complete the tripping action of the circuit breaker after being pushed by the fault protection device.

[0042] In the above embodiment, the circuit breaker is tripped by triggering the fault protection device, so that the circuit breaker is automatically tripped when a fault occurs, so that the moving contact is separated and the faulty line is cut off.

[0043] In some embodiments, the tripping device is provided with a repulsion arm, and the repulsion arm is correspondingly located behind the moving contact.

[0044] In the above embodiment, when a large current is suddenly encountered, an electric repulsive force is formed between the moving and static contacts to cause the moving contact to bounce. During the bouncing process, the moving contact triggers the repulsion arm of the trip button, causing the trip button to rotate and trip to realize the rapid tripping and opening of the circuit breaker. The moving contact repulsion cooperates with the repulsion arm of the trip button to realize the early repulsion and tripping of the circuit breaker when encountering a large current, and the circuit breaker can be quickly disconnected when disconnected.

[0045] In some embodiments, the tripping device is provided with a booster arm, and the booster arm is correspondingly located in the waist-round hole supported by the moving contact.

[0046] In the above embodiment, when a short circuit fault suddenly occurs, the magnetic action protection device will push the magnetic transfer rod, which will hit the tripping latch through the magnetic transfer rod. After the tripping latch is tripped and released, it can continue to rotate so that the booster arm hits the moving contact support to achieve boost acceleration rotation and increase the separation force and separation speed of the moving contact, thereby preventing contact adhesion and improving the breaking capacity.

[0047] In some embodiments, an insulating gas-generating plastic sheet is also provided on the moving contact support.

[0048] In the above embodiment, the insulating gas-generating plastic sheet corresponds to the arc generated when the moving contact and the static contact are separated. When disconnecting, an arc will be generated between the moving and static contacts, and the high temperature of the arc will corrode the moving contact support. The insulating gas-generating plastic sheet is arranged at the position where the moving contact support faces the moving and static contacts, and the high temperature of the arc is encountered to generate gas to blow the arc. The insulating gas-generating plastic sheet is used to generate gas when it encounters the arc, and the arc is blown toward the arc extinguishing chamber, which has the effect of improving the disconnection capacity.

[0049] The beneficial effects of the present invention are as follows:

[0050] 1. In the circuit breaker disclosed in the present application, an operating handle is arranged at the top of the circuit breaker, and a connecting rod connected to the operating handle moves in the longitudinal direction. The operating handle directly drives the movable contact support to rotate through the connecting rod, which changes the eccentric swinging structure layout of the movable contact support of the traditional circuit breaker, so that the movable contact support has a larger rotation angle, realizes a large stroke of the movable contact, and a large opening distance between the movable contact and the static contact. By increasing the opening distance, the isolation capacity and breaking capacity of the circuit breaker can be improved. Under the same conditions, the installation category voltage level of the circuit breaker and the electrical performance of the circuit breaker, especially the electrical life and the circuit breaking capacity, can be improved.

[0051] 2. The circuit breaker disclosed in the present application has a moving contact that uses two contact parts to contact the two static contacts of the circuit breaker to achieve double breakpoints. When the double breakpoints interrupt the fault current, the two breakpoints start arcing at the same time to form two series arcs, which can better limit the current and extinguish the arc. It can also be set to a single breakpoint form. When the performance requirements of the circuit breaker are not high in the application, setting it as a single breakpoint is low-cost.

[0052] 3. The circuit breaker disclosed in the present application adopts a multi-trigger point design for the tripping catch. On the premise of realizing overload and short-circuit protection, it can also utilize the electric repulsion between the moving and static contacts during a short circuit. The moving contact triggers the tripping catch to unlock, which greatly improves the unlocking speed. In addition, the magnetic tripping system triggers the tripping part to rotate the tripping catch, so that the booster arm strikes the moving contact support to achieve boost acceleration rotation and increase the separation force and separation speed of the moving contact, thereby preventing contact adhesion and improving the breaking capacity.

[0053] 4. Through the structural coordination between the moving contact support, the moving contact, the static contact and the tripping device, and by setting the energized conductor below or above the moving contact's moving track, a Lorentz force is generated between the conductor and the arc. The Lorentz force is applied to the arc to push the arc toward the arc extinguishing chamber. The Lorentz force is used to push the arc toward the arc extinguishing chamber, accelerate the arc to enter the arc extinguishing chamber, achieve rapid ionization, and improve the circuit breaker's breaking capacity. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0055] Figure 1 A schematic diagram of the structure of a double-break circuit breaker disclosed in the first embodiment of the present invention;

[0056] Figure 2 It is a schematic diagram of the azimuth structure of the double-break circuit breaker disclosed in the first embodiment of the present invention;

[0057] Figure 3 It is a schematic diagram of the upper, middle and lower layout of the double-break circuit breaker disclosed in the first embodiment of the present invention;

[0058] Figure 4 It is a schematic diagram of the left-middle-right layout of the double-break circuit breaker disclosed in the first embodiment of the present invention;

[0059] Figure 5 It is a schematic diagram of the Lorentz force arc blowing principle in the circuit breaker disclosed in the first embodiment of the present invention;

[0060] Figure 6 It is a schematic structural diagram of an arc extinguishing chamber in a circuit breaker disclosed in the first embodiment of the present invention;

[0061] Figure 7 It is a schematic structural diagram of an arc extinguishing chamber of other shapes in a circuit breaker disclosed in the first embodiment of the present invention;

[0062] Figure 8 It is a schematic structural diagram of a circuit breaker disclosed in the first embodiment of the present invention in which the movable contact is a double contact;

[0063] Fig. 9 It is a structural schematic diagram of a hand-connecting rod controlled tripping device and a moving contact in a circuit breaker disclosed in the first embodiment of the present invention;

[0064] Fig.10 It is a schematic diagram of the structure of the cooperation of the tripping pusher in the circuit breaker disclosed in the first embodiment of the present invention;

[0065] Fig.11 It is a structural schematic diagram of a tripping mechanism in a circuit breaker disclosed in the first embodiment of the present invention;

[0066] Fig.12 A schematic diagram of the gas generation principle of the insulating gas generating plastic sheet in the circuit breaker disclosed in the first embodiment of the present invention;

[0067] Fig.13 It is another structural schematic diagram of the double breakpoint circuit breaker disclosed in the second embodiment of the present invention;

[0068] Fig.14 A schematic diagram of the structure of a single breakpoint circuit breaker disclosed in a third embodiment of the present invention;

[0069] Fig.15 The third embodiment of the present invention discloses a circuit breaker in which the middle moving contact is a single contact structure schematic diagram. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical scheme and advantages of the implementation of the present invention clearer, the technical scheme in the embodiment of the present invention will be described in more detail below in conjunction with the drawings in the embodiment of the present invention. In the drawings, the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, not all of the embodiments.

[0071] The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be construed as limiting the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0072] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0073] First embodiment:

[0074] like Figures 1 to 12 As shown, a circuit breaker 1000 at least includes an insulating housing 20 and internal components; the internal components at least include an operating handle 10, a connecting rod 11, a moving contact support 12, a moving contact 16, a static contact 17, an arc extinguishing chamber 13, a tripping device 14, and a fault protection device 15. The moving contact support 12 is provided with at least the moving contact 16 and the tripping device 14. The moving contact support 12 is arranged in a rotational manner at the middle position of the insulating housing 20. At least one linked connecting rod 11 is arranged between the operating handle 10 and the tripping device 14 on the moving contact support 12. The linked connecting rod 11 is arranged for longitudinal movement, and the linked connecting rod 11 is arranged at an angle of no more than 25 degrees to the Y axis. The static contact 17 is arranged on both sides of the moving contact support 12. Figure 2In the figure, directions are indicated by X and Y axes, wherein an angle of 25 degrees indicates the arrangement angle range of the linked connecting rod and the Y axis, and two angles of 25 degrees indicate that connecting rods can be arranged on both sides of the Y axis. The operating handle 10 is connected to the tripping device 14 on the moving contact support 12 through the connecting rod at an angle of no more than 25° in the Y axis direction. The moving contact support 12 is rotated by rotating the operating handle 10 to realize the closing and opening operations of the circuit breaker 1000. The tripping device 14 and the moving contact 16 are arranged on the moving contact support 12, and the moving contact support 12 is operated by the connecting rod 11. The moving contact 16 rotates with the moving contact support 12. After the closing is completed, if a fault occurs, the tripping device 14 on the moving contact support 12 can be triggered to complete the tripping and opening. Through this angle setting and the linkage connecting rod 11 being set for longitudinal movement, the connecting rod 11 is arranged in the Y-axis direction and the handle 10 directly drives the moving contact support 12 in the middle of the housing 20 from the top to rotate, which has a large rotation angle, is convenient for increasing the opening and closing distance of the moving contact 16, and improves the safety of the circuit breaker. On the other hand, the tripping device 14 and the moving contact 16 are arranged on the moving contact support 12, and rotate with the moving contact 16. The moving contact support 12 is operated to realize rotational movement by connecting the connecting rod 11 through the operating handle 10 arranged at the top. The tripping device 14 can be triggered on the moving contact support 12, so that the moving contact support 12 completes the rapid tripping and unlocking to realize the automatic opening of the circuit breaker 1000, which has the advantages of compact structure, simple and reliable.

[0075] like Figure 3 and Figure 4As shown, in order to facilitate a more reasonable structural layout of each structure in the circuit breaker 1000 inside the circuit breaker housing, this embodiment divides the circuit breaker 1000 into functional areas in the upper, middle and lower dimensions and the left, middle and right dimensions, wherein the insulating housing 20 is provided with at least left, middle and right width functional areas in the transverse X-axis direction, and the middle width functional area is provided with the moving contact support 12. The left and right width functional areas are correspondingly provided with the arc extinguishing chamber 13 and / or the fault protection device 15. The insulating housing 20 is provided with at least upper, middle and lower height functional areas in the longitudinal Y-axis direction, and the middle height functional area is provided with the moving contact support 12. The upper height functional area is provided with the operating handle 10, and the upper and lower height functional areas are provided with the fault protection device 15 and / or the mounting fixture 18. The space position of the insulating housing 20 is divided into regions, and different functional components are arranged in corresponding regions. The moving contact support 12 is arranged in the middle position, which is more reasonably arranged as the main functional component. The remaining functional components are arranged around it to realize the complete function of the circuit breaker 1000 with the advantages of compact structure, reliable operation and action. The moving contact support is arranged in the middle position, and two moving contacts can be arranged in the surrounding space to realize a double breakpoint structure, which can greatly improve the breaking capacity of the circuit breaker. In addition, the layout can be made according to actual needs. For example, the functional components can be selectively arranged according to the functional performance requirements of the product. By arranging the arc extinguishing chamber 13 on the left and right sides, the arc extinguishing capacity of the circuit breaker can be improved. The modular functional components can be selected according to functional needs. In addition, the installation fixture 18 is arranged in the lower height functional area to facilitate the installation of the circuit breaker 1000, and the operating handle 10 is arranged in the upper height functional area for easy operation. The overall layout is compact and reasonable.

[0076] like Figure 5As shown, this embodiment discloses the process of arc blowing by the Lorentz force during the operation of the circuit breaker. In this embodiment, the outer sides of the arc extinguishing chamber 13 and the fault protection device 15 are respectively provided with connection terminals 19 for connecting conductors. The connection terminals 19 are components that are electrically connected to the outside. Being arranged on the outside is more convenient for installation and application. A conductor 171 carrying current is arranged corresponding to the moving track of the moving contact 16. Furthermore, the current direction of the conductor 171 carrying current is opposite to the arc current direction generated when the moving contact 16 and the static contact 17 are separated. A conductor 171 carrying current is arranged below or above the moving track of the moving contact 16. The current on the conductor 171 is opposite to the arc current direction formed by the opening of the moving and static contacts. In this way, a Lorentz force is generated between the conductor 171 and the arc. The conductor 171 is in a fixed form. The Lorentz force is applied to the arc to push the arc toward the arc extinguishing chamber 13. A powered conductor 171 is arranged under the moving track of the moving contact 16 , and the current direction of the powered conductor 171 and the arc current direction are limited, so as to accelerate the arc to enter the arc extinguishing chamber 13 to realize rapid extinguishing, thereby improving the breaking capacity of the circuit breaker 1000 .

[0077] Preferably, the arc extinguishing chamber 13 in this embodiment is arranged on both sides of the moving contact support 12, and the fault protection device 15 is arranged above or below the arc extinguishing chamber 13. The arc extinguishing chambers 13 arranged on both sides are double-breakpoint structures, and two series breaks are formed during breaking, which is more conducive to arc extinguishing and improves the breaking capacity. After the arc extinguishing chambers 13 are arranged on both sides, the fault protection device 15 is arranged above and below. The circuit breaker 1000 has a compact structure and a greatly improved breaking capacity.

[0078] In addition, the fault protection device 15 includes a magnetic action fault protection device 152 and a thermal action fault protection device 151. The magnetic action protection device 152 uses the magnetic property of the current to generate a magnetic field to form a magnetic conductive material inside the current to generate an attraction action to trigger the tripping device. The thermal action protection device 151 in this embodiment uses the thermal property of the current to connect bimetallic materials with different thermal expansion coefficients in the circuit, and uses the current overload heating to bend the bimetallic materials to trigger the tripping device. By combining the magnetic action fault protection device 152 and the thermal action fault protection device 151, the circuit breaker 1000 is automatically tripped for overload and short circuit faults, and the structure is simple and the cost is low. When the fault protection device 15 is laid out, when the magnetic action fault protection device 152 is arranged below the arc extinguishing chamber 13 on the corresponding side at the lower left corner of the insulating housing 20, the thermal action fault protection device 151 is arranged above the arc extinguishing chamber 13 on the other side at the upper right corner of the insulating housing 20; when the magnetic action fault protection device 152 is arranged above the arc extinguishing chamber 13 on the corresponding side at the upper right corner of the insulating housing 20, the thermal action fault protection device 151 is arranged below the arc extinguishing chamber 13 on the other side at the lower left corner of the insulating housing 20. After the arc extinguishing chamber 13 is arranged, the thermal action fault protection device 151 or the magnetic action fault protection device 152 can be arranged in the upper and lower areas. After the arc extinguishing chamber 13 is arranged, the area setting position of the thermal action fault protection device 151 or the magnetic action fault protection device 152 makes the layout of the circuit breaker 1000 more compact and the volume of the housing smaller.

[0079] Preferably, in order to improve the arc treatment effect of the arc extinguishing chamber inside the circuit breaker 1000, the shape of the arc extinguishing chamber 13 can be changed according to the space inside the short circuit breaker 1000, and the arc extinguishing chamber 13 is in a straight line shape or an arc shape or an angle shape or a combination of the straight line shape, arc shape and angle shape, such as Figure 6 and Figure 7 As shown, there are two different shapes of arc extinguishing chamber 13, wherein: Figure 6 The arc-shaped arc extinguishing chamber 13, Figure 7 It is a straight arc extinguishing chamber 13. In the present embodiment, when the electric arc enters the arc extinguishing chamber 13, it will be cut into several segments of series arc to increase the arc voltage drop and achieve the effect of rapid arc extinguishing. The more slices the better. In order to achieve more slices in a limited space, the grid slices are arranged in a straight line, an arc line, at least one curved angle and a combination of these shapes according to the spatial structure. The grid slices are arranged in a straight line, an arc line, at least one curved angle and a combination of these shapes. More grid slices can be achieved in a limited space, and the arc extinguishing effect is better.

[0080] like Figure 8 and Fig.10As shown, in this embodiment, the static contact 17 is arranged on both sides supported by the moving contact 16, the moving contact 16 is a double breakpoint, both ends of the moving contact 16 are movable contact parts 161, and two ends of the moving contact 16 are provided with two break points formed when disconnecting with the static contact part. The double breakpoint structure is set in applications with high performance requirements, and the circuit breaker 1000 has high breaking performance. In addition, the operating handle 10 has a hand lever 101 extending upward to the outside of the insulating housing 20, and the circuit breaker 1000 is closed and opened by operating the hand lever 101 externally. The hand lever 101 is outward, which is convenient for the closing and opening operation of the circuit breaker 1000 and the closing and opening position indication of the circuit breaker 1000.

[0081] like Fig.11 As shown, the trip device 14 at least includes a lock 141, a jumper 142 and an elastic element 143. Further, the lock 141 is connected to the connecting rod 11. The trip device 14 forms one of the four connecting rods in the buckled state, and rotates the moving contact support 12 to realize the closing and opening operations of the circuit breaker 1000. When a fault occurs, the buckled lock 141 and the jumper 142 are struck to break one of the four connecting rods to realize the free tripping of the circuit breaker. The elastic element 143 applies a certain elastic force to the jumper 142 so that it can be kept in the buckle preparation position with the lock 141, which is convenient for the next closing operation. The trip device 14 adopts the lock 141 and the jumper 142 structure and is arranged on the moving contact support 12, which has the advantages of compact structure and reliable operation. The two ends 1421 of the jumper 142 on the trip device 14 complete the action tripping and tripping of the circuit breaker 1000 after being pushed by the fault protection device 15. Both ends of the trip button 142 can be pushed by the fault protection device 15, so that the buckle between the trip button 142 and the lock button 141 is disconnected, and one of the four connecting rods is destroyed, so that the circuit breaker 1000 is tripped and the moving contact support 12 returns to the open state, and the circuit breaker 1000 is tripped by triggering the fault protection device 15, so that the circuit breaker 1000 is automatically tripped when a fault occurs, thereby separating the moving contact 16 and cutting off the fault line.

[0082] Preferably, a transfer rod 153 is provided between the tripping button 142 on the tripping device 14 and the fault protection device 15. The tripping button 142, as a triggering device of the tripping mechanism 14, is arranged on the moving contact support 12, performs rotational motion, and is linked with the fault tripping device 15 by the transfer rod 153, so that the fault tripping device 15 strikes the tripping button 142, and realizes the overload and short circuit protection functions. The fault in the operation process of the circuit breaker 1000 is determined by the fault tripping device 15, and the tripping button 142 is triggered, so that the circuit breaker 1000 is tripped to realize the rapid separation of the moving contact 16 and the static contact 17 to cut off the fault.

[0083] Preferably, the trip button 142 on the trip device 14 is provided with a repulsion arm 1423, and the repulsion arm 1423 is correspondingly located behind the moving contact 16. When a large current is suddenly encountered, an electric repulsion force is formed between the moving and static contacts to cause the moving contact 16 to bounce. During the bouncing process, the moving contact 16 triggers the repulsion arm 1423 of the trip button 142, so that the trip button 142 rotates to release the button to realize the rapid tripping and opening of the circuit breaker 1000. The moving contact 16 is used to repel the repulsion arm 1423 of the matching trip button to realize the early repulsion and tripping of the circuit breaker 1000 when encountering a large current, and the circuit breaker 1000 can be quickly disconnected when disconnecting.

[0084] Preferably, the tripping button 142 on the tripping device 14 is provided with a boosting arm 1424, and the boosting arm 1423 is correspondingly located in the waist-shaped hole of the moving contact support 12, such as Fig.10 As shown, when a short circuit fault occurs suddenly, the magnetic action protection device 152 will push the magnetic transfer rod 153, which will hit the trip button 142 through the magnetic transfer rod 153. After the trip button is unlocked and tripped, it can continue to be pushed by the action protection device to rotate so that the booster arm 1424 hits the moving contact support 12 to achieve boost acceleration rotation and increase the separation force and separation speed of the moving contact, thereby preventing the contacts from welding and sticking and improving the breaking capacity.

[0085] Preferably, the moving contact support 12 is further provided with an insulating gas-generating plastic sheet 121, and the insulating gas-generating plastic sheet 121 corresponds to the arc generated when the moving contact 16 and the stationary contact 17 are separated. Fig.12 As shown, when the circuit breaker 1000 is disconnected, an arc will be generated between the moving and static contacts, and the high temperature of the arc will corrode the moving contact support 12. An insulating gas-generating plastic sheet 121 is arranged at the position of the moving contact support 12 facing the moving and static contacts 17, and gas is generated when encountering the high temperature of the arc to blow the arc. The insulating gas-generating plastic sheet 121 generates gas when encountering the arc, and the arc is blown toward the arc extinguishing chamber 13. The insulating gas-generating sheet is made of materials such as nylon, polyoxymethylene, and melamine that generate mixed gas containing hydrogen when encountering high temperature, and has the function of protecting the moving contact support from being corroded by the arc and improving the breaking capacity.

[0086] Second embodiment:

[0087] like Fig.13As shown, it is the second embodiment of the present invention. The difference between this embodiment and the first embodiment is that: the moving contact support 12 is a longitudinal movement in the Y-axis direction to control the opening and closing of the moving contact 16 and the static contact 17, wherein a longitudinal movement guide groove is arranged below the moving contact support 12, and the moving contact support 12 makes the moving contact support move up and down under the constraint of the longitudinal movement guide groove. When the moving contact 16 and the static contact 17 are in contact to complete the closing operation, the magnetic action fault protection device 152 and the thermal action fault protection device 151 cooperate with the magnetic transfer connecting rod 154 to realize the unlocking of the tripping device 14, and complete the separation between the moving contact 16 and the static contact 17. In addition, in this embodiment, the shape of the arc extinguishing chamber 13 is a straight line. In other embodiments, the shape of the arc extinguishing chamber 13 can also be set to other shapes according to the internal space of the circuit breaker. In this embodiment, the longitudinal movement of the moving contact support 12 in the Y-axis direction by the connecting rod 11 can achieve the same technical effect as the first embodiment.

[0088] Third embodiment:

[0089] like Fig.14 and Fig.15 As shown, it is the third embodiment of the present invention. The difference between this embodiment and the first embodiment is that the circuit breaker 1000 is a single-breakpoint circuit breaker, wherein the static contact 17 is arranged on a single side of the support of the moving contact 16, and the arc extinguishing chamber 13 is arranged on a single side of the support 12 of the moving contact. In the case of a single breakpoint, one end of the moving contact 16 is in active contact with the static contact 17, and the other end is the lead-out portion 162 that is indirectly or directly connected to the terminal 19. When the performance requirements of the circuit breaker 1000 are not high in the application, it can be set as a single breakpoint, so that the cost is low. The opening and closing principle of this single-breakpoint circuit breaker is the same as that of the first embodiment. The single-breakpoint circuit breaker can also achieve a large opening and closing spacing of the moving contact, a fast opening and closing speed, and can achieve a large breaking capacity at a limited cost.

[0090] The present invention can be realized in other specific forms without departing from its spirit and essential characteristics. The current embodiment is considered to be exemplary and not restrictive in all aspects, and the scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning of the claims and the scope of equivalents are thus included in the scope of the present invention.

[0091] The present invention can be realized in other specific forms without departing from its spirit and essential characteristics. The current embodiment is considered to be exemplary and not restrictive in all aspects, and the scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning of the claims and the scope of equivalents are thus included in the scope of the present invention.

Claims

1. A circuit breaker, comprising at least an insulating housing and internal components; the internal components at least include an operating handle, a connecting rod, a moving contact support, a moving contact, a static contact, an arc extinguishing chamber, a tripping device, and a fault protection device; the moving contact support is provided with at least the moving contact and the tripping device; the moving contact support is provided at the middle position of the insulating housing in a rotating motion or in a longitudinal motion along the Y axis; at least one linkage connecting rod is provided between the operating handle and the tripping device on the moving contact support, characterized in that: The linked connecting rod is arranged for longitudinal movement.

2. The circuit breaker according to claim 1, characterized in that: The linkage connecting rod forms an angle of no more than 25 degrees with the Y axis.

3. The circuit breaker according to claim 1, characterized in that: The insulating housing is at least provided with left, middle and right width functional areas in the transverse X-axis direction, and the moving contact support is provided in the middle width functional area.

4. The circuit breaker according to claim 2, characterized in that: The arc extinguishing chamber and / or fault protection device are correspondingly arranged in the left and right width functional areas.

5. The circuit breaker according to claim 1, characterized in that: The insulating housing is provided with at least upper, middle and lower height functional zones in the longitudinal Y-axis direction, and the moving contact support is provided in the middle height functional zone.

6. The circuit breaker according to claim 5, characterized in that: The upper height functional area is provided with the operating handle, and the upper and lower height functional areas are provided with the fault protection device and / or the installation fixture.

7. The circuit breaker according to claim 1, characterized in that: The outer sides of the arc extinguishing chamber and the fault protection device are respectively provided with connection terminals for connecting conductors.

8. The circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber is arranged on one side or both sides of the moving contact support. When the arc extinguishing chamber is arranged on both sides of the moving contact support, the fault protection device is arranged above or below the arc extinguishing chamber.

9. The circuit breaker according to claim 1, characterized in that: The fault protection device includes a magnetic action fault protection device and a thermal action fault protection device.

10. The circuit breaker according to claim 9, characterized in that: When the magnetically-actuated fault protection device is arranged below the arc-extinguishing chamber on the side corresponding to the lower left corner of the insulating shell, the thermally-actuated fault protection device is arranged above the arc-extinguishing chamber on the other side corresponding to the upper right corner of the insulating shell; when the magnetically-actuated fault protection device is arranged above the arc-extinguishing chamber on the side corresponding to the upper right corner of the insulating shell, the thermally-actuated fault protection device is arranged below the arc-extinguishing chamber on the other side corresponding to the lower left corner of the insulating shell.

11. The circuit breaker according to claim 1, characterized in that: The stationary contact is arranged on one side or both sides of the movable contact support.

12. The circuit breaker according to claim 1, characterized in that: A conductor carrying current is arranged corresponding to the moving track of the moving contact.

13. The circuit breaker according to claim 12, characterized in that: The current direction of the conductor carrying current is opposite to the arc current direction generated when the moving contact and the static contact are separated.

14. The circuit breaker according to claim 1, characterized in that: The arc extinguishing chamber is in a straight line shape, an arc line shape, an angled shape, or a combination of the straight line shape, the arc line shape, and the angled shape.

15. The circuit breaker according to claim 11, characterized in that: When the static contact is arranged on a single side of the moving contact support, the moving contact is a single breakpoint, one end of the moving contact is a movable contact part, and the other end is a fixed soft wire lead-out part.

16. The circuit breaker according to claim 11, characterized in that: When the stationary contact is arranged on both sides of the moving contact support, the moving contact has double breakpoints, and both ends of the moving contact are movable contact parts.

17. The circuit breaker according to claim 1, characterized in that: The tripping device at least comprises a lock buckle, a jump buckle and an elastic element.

18. The circuit breaker according to claim 1, characterized in that: A transfer rod is provided between the tripping button on the tripping device and the fault protection device.

19. The circuit breaker according to claim 17, characterized in that: The lock buckle is connected to the connecting rod.

20. The circuit breaker according to claim 17, characterized in that: The two ends of the tripping device on the tripping device complete the tripping action of the circuit breaker after being pushed by the fault protection device.

21. The circuit breaker according to claim 1, characterized in that: The tripping button on the tripping device is provided with a repulsion arm, and the repulsion arm is correspondingly located behind the moving contact.

22. The circuit breaker according to claim 17, characterized in that: The tripping button on the tripping device is provided with a boosting arm, and the boosting arm is correspondingly located in the waist-round hole supported by the moving contact.

23. The circuit breaker according to claim 1, characterized in that: An insulating gas-generating plastic sheet is also provided on the moving contact support.

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