A 2P leakage circuit breaker

Abstract

The patent of the present invention relates to a 2P leakage circuit breaker, including a circuit breaker bottom shell, a middle base shell, an operating handle and many other parts. It is characterized by a return spring piece, the various parts of the tripping mechanism are connected by a specific rotating shaft, the operating handle is connected to the tripping buckle through a connecting rod, the lock buckle has an effective bending section to cooperate with the short-circuit releaser, and the middle base shell is provided with a through slot for the reasonable layout of various key components. The beneficial effects are reflected in: fewer accessories for the tripping mechanism, lower costs and more stable performance; the internal layout is optimized to reduce the overall thickness, close to the 1P thickness, which is convenient for installation and function expansion; the return spring piece ensures the reset of the top rod of the leakage releaser and improves the operational stability. The circuit breaker has excellent comprehensive performance and can better meet the power system's requirements for cost, space and safety.

Description

Technical Field

[0001] The invention relates to the technical field of circuit breaker technology, in particular to a 2P leakage circuit breaker. Background Art

[0002] In modern power systems, circuit breakers play a vital role in ensuring safe and stable operation of circuits. With the increasing number of electrical equipment and the increasingly complex power environment, higher requirements are placed on the performance, safety, and space utilization efficiency of circuit breakers.

[0003] Traditional 2P leakage circuit breakers have many design deficiencies. In terms of the tripping mechanism, its structure is often complex and contains a large number of accessories. Too many accessories not only lead to high production costs, but also easily cause unstable performance during long-term operation due to mutual wear between components and reduced matching accuracy. For example, after frequent opening and closing operations, complex tripping mechanisms may experience jamming, malfunctions, and other faults, affecting their ability to quickly and accurately respond to faults such as overload, short circuit, and leakage, and thus fail to effectively protect electrical equipment and personnel safety.

[0004] At the same time, in terms of spatial layout, traditional 2P leakage circuit breakers lack reasonable planning. Various components such as short-circuit releases, leakage releases, circuit board components, etc. are usually distributed, without fully considering the efficient use of space. This makes the overall size of the circuit breaker larger and thicker, and in some application scenarios with high space requirements, such as distribution boxes, electrical control cabinets, etc., the installation will be greatly restricted. Especially in some electrical equipment with compact space or distribution box renovation projects in old buildings, the large size of traditional 2P leakage circuit breakers may make it impossible to install smoothly, or require large-scale renovation of the installation space, increasing the installation cost and construction difficulty.

[0005] In addition, with the development of energy management and smart grid technology, the demand for intelligent function integration and miniaturization of circuit breakers is becoming stronger and stronger. The structure and layout of traditional 2P leakage circuit breakers can no longer meet these new requirements. There is an urgent need for a new type of 2P leakage circuit breaker design that can reduce costs, improve stability and significantly reduce overall thickness while ensuring or even improving performance, so as to better adapt to the complexity and variability of modern power systems and the requirements for efficient use of space. Summary of the invention

[0006] In view of the deficiencies in the background technology, the present invention provides a 2P leakage circuit breaker.

[0007] The technical scheme adopted by the present invention is: a 2P leakage circuit breaker, including a circuit breaker bottom shell, a middle base shell, an upper cover, an operating handle, a tripping mechanism, a short-circuit tripping device, a leakage tripping device, a magnetic ring, an arc extinguishing component, a circuit board component and a double metal mechanism, and also includes a return spring fixed on the circuit breaker bottom shell, the tripping mechanism includes a contact seat rotatably connected to a rotating shaft 1 of the circuit breaker bottom shell, a jump buckle rotatably connected to a rotating shaft 2 at the upper end of the contact seat, a lock buckle rotatably connected to a rotating shaft 3 below the contact seat, a moving contact rotatably connected to a rotating shaft 4 on both sides of the lower end of the contact seat, and a contact sleeved on the rotating shaft. The lock buckle torsion spring of shaft three and the contact torsion spring sleeved on the rotating shaft four, the operating handle and the jump buckle are connected by a connecting rod, the jump buckle and the lock buckle are provided with mutually engaged engaging steps, the lower end of the lock buckle has an action bending section that bypasses the lower end of the contact seat and bends toward one side of the short-circuit releaser, the action bending section is provided with an action surface that interacts with the output end of the short-circuit releaser, one side of the contact seat is provided with a card slot for engaging with a return spring sheet, the top of the return spring sheet extends to the top rod of the leakage releaser, and the return spring sheet has an elastic force to press the top rod back into the leakage releaser;

[0008] A through slot is provided on one side of the middle base shell, the short-circuit releaser and the leakage releaser are stacked above the through slot, the circuit board assembly is arranged on the side of the short-circuit releaser and the leakage releaser, and the magnetic ring is arranged below the short-circuit releaser and the leakage releaser.

[0009] Furthermore, one end of the lock torsion spring is connected to the torsion spring step 1 on the lock, and the other end is connected to the torsion spring step 2 on the contact seat; one end of the contact torsion spring is connected to the torsion spring step 2, and the other end is connected to the moving contact.

[0010] Furthermore, the leakage release comprises a shell, a base, and a coil support, a yoke, a magnet, an armature, a push rod and a metal support member arranged in the shell, the yoke is a U-shaped structure, the yoke comprises a first arm and a second arm, the magnet is arranged between the first arm and the second arm of the yoke, the coil frame is sleeved on the first arm, and a coil is wound on the coil frame, the armature is horizontally arranged on the yoke, one end of the push rod is in contact with the armature and the other end passes through the shell;

[0011] It also includes an elastic member and a first spring base, wherein the first spring base is fixed on the armature, a second spring base and abutment step are provided on the upper end of the metal support member, one end of the elastic member is connected to the first spring base, and the other end is connected to the second spring base, and one end of the armature is against the abutment step.

[0012] Furthermore, the double-metal mechanism includes a pull rod and a double-metal, the pull rod is provided with a connecting long slot, a guiding long slot and a bending connection part, the lock buckle is provided with a connecting column movably connected to the connecting long slot, the middle seat shell is provided with a through slot, the bending connection part is connected to the double-metal after passing through the through slot, a guide column movably connected to the guiding long slot is provided on one side of the through slot, and a movable gap is left between the connecting long slot and the connecting column, and between the guiding long slot and the guide column.

[0013] Furthermore, the double metal is arranged on the back side of the middle seat shell, one end of which is connected to an arc-starting piece, the bottom of the arc-starting piece has a positioning protrusion, and the middle seat shell is provided with a positioning groove that is plugged into and cooperates with the positioning protrusion.

[0014] Furthermore, it also includes an experimental button, a reset elastic member, a power-taking torsion spring and a power-taking plate, wherein the power-taking plate is connected to the bottom shell of the circuit breaker, and the power-taking torsion spring is mounted on the hole column on the bottom shell of the circuit breaker. The upper end of the power-taking torsion spring has a power-taking part located above the power-taking plate, and the lower end of the power-taking torsion spring has a connecting part extending to the side of the moving contact. When the experimental button is pressed down, the experimental button can press the power-taking part down so that the power-taking part and the power-taking plate are abutted to achieve electrical connection, and the connecting part can only contact the moving contact to achieve electrical connection when the circuit breaker is closed.

[0015] Furthermore, it also includes a positioning mechanism for positioning the connecting part, the positioning mechanism includes a guide column 1 located below the hole column and a guide column 2 and a guide column 3 arranged at intervals and obliquely below the guide column 1, and the connecting part of the power-taking torsion spring extends from the side of the guide column 1 and the clamping groove between the guide column 2 and the guide column 3 to the side of the moving contact.

[0016] Furthermore, a pressing portion is extended from one side of the experimental button, and the pressing portion is provided with an engaging opening engaged with the power-taking part.

[0017] Furthermore, a spring step is provided on the bottom shell of the circuit breaker below the test button, one end of the reset elastic member is connected to the spring step, and the other end is connected to the lower end of the test button.

[0018] Furthermore, the power extraction piece is electrically connected to a first terminal of the circuit breaker through a wire, and the moving contact is electrically connected to a second terminal of the circuit breaker.

[0019] The beneficial effects of the present invention are:

[0020] 1. Reduce production costs: The tripping mechanism of the present invention only has a tripping buckle, a locking buckle, a contact seat, a moving contact and a small amount of torsion springs, and adopts a simple design with a small number of accessories. Compared with the traditional complex structure of the tripping mechanism, the cost investment in the procurement, processing, assembly and quality inspection of many parts is reduced. For example, unnecessary connecting parts and auxiliary brackets are reduced, which greatly reduces the cost of raw materials. At the same time, the assembly process is simpler and more efficient due to the reduction of parts, which shortens the assembly time and reduces labor costs, thereby significantly reducing the manufacturing cost of the product as a whole and improving the price competitiveness of the product in the market.

[0021] 2. Improve performance stability: Streamlined tripping mechanism accessories mean fewer potential failure points. The coordination between the various components is more direct and precise, reducing the accumulation of coordination errors and mutual interference caused by too many components. For example, in the long-term operation process, there will be no tripping failure or malfunction caused by wear and looseness of too many small parts. Its detection and response to faults such as overload, short circuit and leakage are faster and more accurate, which effectively improves the reliability and stability of the circuit breaker, ensures the safe operation of the power system, and reduces the risk of equipment damage and maintenance costs caused by circuit breaker failure.

[0022] 3. Reduce the overall thickness: Through the innovative internal layout design, the short-circuit release and the leakage release are stacked above the through slot of the middle shell, the circuit board assembly is set on its side, and the magnetic ring is set below. This compact and reasonable layout method greatly optimizes the space utilization efficiency, so that the overall thickness of the 2P leakage circuit breaker is greatly reduced while having a bipolar protection function. It can be seen from the attached figure that its thickness is equivalent to that of the 1P circuit breaker. In installation environments with limited space such as distribution boxes and electrical control cabinets, it can be laid out and installed more conveniently, without the need for large-scale space modification to accommodate traditional 2P leakage circuit breakers, saving installation space and costs, improving the utilization of the internal space of electrical equipment, and providing more space margin for the installation and wiring of other electrical components.

[0023] 4. Structural coordination optimization: The connection and coordination relationship between the various components of the tripping mechanism, such as the contact seat, jumper, lock, moving contact, etc., has been carefully designed. For example, the operating handle and the jumper are connected by a connecting rod, and the jumper and the lock are provided with mutually engaging steps. This connection method enables the action of the operating handle to be accurately transmitted to the tripping mechanism, realizing reliable opening and closing control. At the same time, the design of the action bend at the lower end of the lock and the action surface that interacts with the output end of the short-circuit release ensures a rapid response in the event of a short-circuit fault, thereby improving the timeliness and effectiveness of the short-circuit protection. The action bend at the lower end of the lock can bypass the contact seat and extend to the short-circuit release, thereby improving space utilization, making the structure of the entire tripping mechanism more compact and more reasonably coordinated, and improving the overall reliability of the circuit breaker.

[0024] 5. Improve the return ability of the leakage release: The return spring fixed on the bottom shell of the circuit breaker is closely matched with the tripping mechanism and the leakage release. Its top extends to the top rod of the leakage release, and uses its own elastic force to press the top rod back into the leakage release, ensuring the rapid reset of the leakage release after the action. This is not only conducive to the circuit breaker to resume normal operation in time after eliminating the leakage fault, reducing power outage time and improving the continuity of power supply, but also avoids the subsequent misoperation or fault hidden dangers caused by the failure of the leakage release top rod to reset in time, further enhancing the stability and safety of the circuit breaker operation.

[0025] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the appearance structure of the present invention.

[0027] Figure 2 This is a front view diagram of the device in the open state after the upper cover is hidden.

[0028] Figure 3 This is a schematic diagram from another perspective of the open switch state after the upper cover is hidden.

[0029] Figure 4 This is a schematic diagram of the back side of the circuit breaker in the open state after the upper cover and the bottom shell of the circuit breaker are hidden.

[0030] Figure 5 This is a front view diagram of the device in the closed state after the upper cover is hidden.

[0031] Figure 6 This is a schematic diagram of the back side of the circuit breaker in the open state after the upper cover and the bottom shell of the circuit breaker are hidden.

[0032] Figure 7 It is a structural diagram of the tripping mechanism.

[0033] Figure 8 This is a schematic diagram of the appearance of the leakage release.

[0034] Fig. 9 This is the internal schematic diagram of the leakage release.

[0035] Fig.10 Schematic diagram of the internal structure of the leakage release.

[0036] Fig.11 Schematic diagram of the yoke and metal support.

[0037] Fig.12 This is a schematic diagram of a dual-gold institution.

[0038] Fig.13 A schematic diagram of the structure of the lock.

[0039] Fig.14 Schematic diagram of the pull rod structure.

[0040] Fig.15 It is a schematic diagram of the structure of the middle seat shell and the double metal.

[0041] Fig.16 Schematic diagram of the structure of the middle seat shell

[0042] Fig.17 This is a schematic diagram of the structure of the arc starting piece.

[0043] Fig.18 This is a local schematic diagram of the experimental button.

[0044] Fig.19 This is a schematic diagram of the structure of the experimental button.

[0045] Figure 1-19 Middle: 1. Circuit breaker bottom shell; 2. Middle base shell; 3. Upper cover; 4. Operating handle; 5. Short circuit release; 6. Leakage release; 7. Magnetic ring; 8. Arc extinguishing assembly; 9. Circuit board assembly; 10. Double metal mechanism; 11. Return spring; 12. Shaft 1; 13. Contact seat; 14. Shaft 2; 15. Jumper; 16. Shaft 3; 17. Lock; 18. Shaft 4; 19. Moving contact; 20. Lock Buckle torsion spring; 21, contact torsion spring; 22, connecting rod; 23, engaging step; 24, action bend; 25, action surface; 26, slot; 27, through slot; 28, torsion spring step 1; 29, torsion spring step 2; 601, housing; 602, base; 603, coil support; 604, yoke; 605, magnetic steel; 606, armature; 607, ejector rod; 608, metal support; 609, the first One arm; 610, second arm; 611, coil; 612, elastic member; 613, first spring base; 614, second spring base; 615, abutting step; 102, pull rod; 103, double metal; 104, connecting long groove; 105, guiding long groove; 106, bending connection; 107, connecting column; 108, through groove; 109, guide column; 110, arc-starting sheet; 112, positioning protrusion ; 113, positioning groove; 30, experimental button; 31, reset elastic member; 32, power-taking torsion spring; 33, power-taking sheet; 34, hole column; 35, power-taking part; 36, connecting part; 37, guide column one; 38, guide column two; 39, guide column three; 40, pressing part; 41, fitting mouth; 42, spring step; 43, wire; 44, first terminal; 45, second terminal; 46, static contact. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0048] The invention provides a 2P leakage circuit breaker.

[0049] In this embodiment, refer to Figure 1-19 The 2P leakage circuit breaker includes a circuit breaker bottom shell 1, a middle base shell 2, an upper cover 3, an operating handle 4, a tripping mechanism, a short-circuit tripping device 5, a leakage tripping device 6, a magnetic ring 7, an arc extinguishing assembly 8, a circuit board assembly 9 and a double metal mechanism 10, and also includes a return spring 11 fixed on the circuit breaker bottom shell, the tripping mechanism includes a contact seat 13 rotatably connected to a rotating shaft 12 of the circuit breaker bottom shell, a tripping buckle 15 rotatably connected to a rotating shaft 2 14 at the upper end of the contact seat 13, a lock buckle 17 rotatably connected to a rotating shaft 3 16 below the contact seat, a moving contact 19 rotatably connected to a rotating shaft 4 18 on both sides of the lower end of the contact seat, and a contact sleeve 16 disposed on the rotating shaft 17. The lock buckle torsion spring 20 of the third 16 and the contact torsion spring 21 mounted on the rotating shaft 4 18, the operating handle and the jump buckle are connected by a connecting rod 22, the jump buckle and the lock buckle are provided with mutually engaged engaging steps 23, the lower end of the lock buckle has an action bent section 24 that bypasses the lower end of the contact seat and bends to one side of the short-circuit releaser, the action bent section 24 is provided with an action surface 25 that interacts with the output end of the short-circuit releaser, one side of the contact seat is provided with a card slot 26 for engaging with a return spring piece, the top of the return spring piece extends to the top rod of the leakage releaser, and the return spring piece has an elastic force to press the top rod back into the leakage releaser;

[0050] A through slot 27 is provided on one side of the middle base shell, the short-circuit releaser and the leakage releaser are stacked above the through slot, the circuit board assembly is arranged on the side of the short-circuit releaser and the leakage releaser, and the magnetic ring is arranged below the short-circuit releaser and the leakage releaser.

[0051] The tripping mechanism of the present invention only has a tripping buckle, a locking buckle, a contact seat, a moving contact and a small amount of torsion springs. The overall structure is simpler and the coordination is more reasonable. Fewer accessories means lower costs and fewer potential failure points. The coordination between the various components is more direct and accurate, reducing the accumulation of coordination errors and mutual interference caused by too many components.

[0052] Tripping mechanism action principle: Figure 1 As shown, it is in the open state. At this time, push the handle to the right to tilt the contact seat through the tripping buckle, so that the contact seat and the moving contact rotate clockwise, so that the moving contact contacts the static contact to close the circuit. Figure 2 On the contrary, rotate the handle counterclockwise to return the contact seat and the moving contact to their original positions, thus opening the moving contact from the static contact.

[0053] Among them, the return spring is fixed to the bottom shell of the circuit breaker and linked with the contact seat and the leakage release. After the leakage release is actuated, the top rod can be reset with the help of its elastic force, ensuring that the circuit breaker can quickly resume normal operation after the leakage fault is eliminated, reducing power outage time and enhancing operational stability. The various components of the tripping mechanism are connected and matched through specific rotating shafts, such as the engagement steps of the jumper and the lock to achieve reliable opening and closing control locking, and the action bend of the lock cooperates with the action surface of the output end of the short-circuit release, which can quickly trigger the tripping action in the event of a short circuit (the output end of the short-circuit release extends and hits the action surface, causing the lock to rotate to complete the tripping and opening), improving the timeliness and effectiveness of short-circuit protection.

[0054] Among them, the middle base shell is opened through the through slot, and combined with the circuit breaker bottom shell and the upper cover to form sufficient installation space, the short-circuit releaser and the leakage releaser are stacked in the through slot, and the circuit board assembly and the magnetic ring are installed therein. Through reasonable layout, the installation space is saved while the space utilization rate is improved, which can effectively reduce the overall thickness of the circuit breaker, making the thickness of the 2P circuit breaker almost the same as that of the 1P circuit breaker, which is convenient for installation in a small space and reserves space for integrating more functions.

[0055] The width of the slot should be greater than the thickness of the return spring to ensure that sufficient return space is reserved for the return spring after the top rod of the leakage release acts on the lock buckle through the return spring to trip the trip mechanism and open the gate.

[0056] Specifically, one end of the lock torsion spring is connected to the torsion spring step 1 28 on the lock, and the other end is connected to the torsion spring step 29 on the contact seat. One end of the contact torsion spring is connected to the torsion spring step 2, and the other end is connected to the moving contact.

[0057] In this embodiment, the lock buckle torsion spring provides the lock buckle with appropriate rotational force and reset force, ensuring the stable operation and reset of the lock buckle in normal and fault conditions, and ensuring the reliability of the opening and closing operations. The contact torsion spring applies elastic force to the moving contact to ensure the stability of the contact pressure between the moving contact and the static contact 46, reduce contact resistance, reduce the risk of heating, improve the conductivity and sensitivity of the opening and closing operations, effectively prevent electrical faults caused by poor contact of the contacts, extend the service life of the contacts and improve the overall performance of the circuit breaker.

[0058] Specifically, the leakage release device includes a housing 601, a base 602, and a coil support 603, a yoke 604, a magnet 605, an armature 606, a push rod 607, and a metal support 608 arranged in the housing. The yoke is a U-shaped structure, and the yoke includes a first arm 609 and a second arm 610. The magnet is arranged between the first arm and the second arm of the yoke. The coil frame is sleeved on the first arm, and a coil 611 is wound on the coil frame. The armature is horizontally arranged on the yoke, and one end of the push rod is in contact with the armature and cooperates with the armature, and the other end passes through the housing.

[0059] It also includes an elastic member 612 and a first spring base 613, wherein the first spring base is fixed on the armature, and a second spring base 614 and abutting step 615 are provided on the upper end of the metal support member, one end of the elastic member is connected to the first spring base, and the other end is connected to the second spring base, and one end of the armature is against the abutting step.

[0060] In this embodiment, by providing a first spring base and a second spring base, and the two ends of the elastic member are connected by two spring bases, the pulling force can cause the armature to tilt, thereby achieving more stable force transmission and action control, optimizing the overall function of the release, and improving the reliability and accuracy of the tripping action.

[0061] By setting up a special first spring base and a second spring base, the two ends of the elastic member are connected to the two bases, and the elastic member will not be twisted or interfere with the metal support frame during operation. This ensures that during the operation of the release, the various components can work together stably, and the stability of the overall structure will not be affected by the abnormal force on the elastic member, thereby ensuring that the release can operate reliably under various working conditions and effectively improving the stability of the release.

[0062] The working principle of the leakage release is:

[0063] 1. Initial state:

[0064] When the releaser does not trigger the tripping action, the elastic member is in a stretched state, and its tension acts on the armature through the first spring base and the second spring base. The magnet forms a stable magnetic field under the action of the yoke and the fixing frame, and the magnetic field produces a certain suction force on the armature. Under the action of the suction force, the armature remains in place and the ejector rod is also in the initial position.

[0065] 2. Triggering the tripping action:

[0066] When an abnormal situation such as overload or short circuit occurs in the circuit, causing the current passing through the coil to change, the magnetic field strength generated by the coil will also change accordingly according to the principle of electromagnetic induction, breaking the balance between the field attraction and the tension of the elastic part. The Xi'an will tilt up under the tension of the elastic part and pass through the outer casing. The movement of the top rod can trigger the relevant mechanism of the circuit breaker, causing the circuit breaker to disconnect the circuit.

[0067] Specifically, the double-metal mechanism includes a pull rod 102 and a double metal 103, the pull rod is provided with a connecting long slot 104, a guiding long slot 105 and a bending connection portion 106, the lock buckle is provided with a connecting column 107 movably connected to the connecting long slot, the middle seat shell is provided with a through slot 108, the bending connection portion is connected to the double metal after passing through the through slot, and a guide column 109 movably connected to the guiding long slot is provided on one side of the through slot, and a movable gap is left between the connecting long slot and the connecting column, and between the guiding long slot and the guide column.

[0068] In this embodiment, by providing a connecting slot on the pull rod, and making the connecting column of the lock buckle movably connected thereto, and reserving an error gap (there is a movable gap between the connecting slot and the connecting column, and between the guide slot and the guide column), the problem of the lock buckle being directly tripped due to the thermal expansion and contraction of the double metal is effectively solved. When the double metal expands due to heat or contracts due to cold, the movable gap between the connecting slot and the connecting column can provide a buffer space for the size change of the double metal, avoiding the false tripping caused by the direct transmission of the slight deformation of the double metal to the lock buckle, greatly improving the stability and reliability of the circuit breaker, reducing the risk of power supply interruption caused by false arc breaking, and ensuring the continuous and stable operation of the power system.

[0069] Secondly, the cooperation between the long guide slot and the guide column on the middle housing accurately defines the moving track of the pull rod. This design enables the pull rod to move along a predetermined path when subjected to the force of the double metal, avoiding unstable factors such as shaking and offset of the pull rod during the movement. This ensures the accuracy and consistency of the lock release action, effectively improves the breaking capacity of the circuit breaker, and enables it to quickly and reliably cut off the circuit under abnormal conditions such as overload or short circuit, which plays a more effective role in protecting power equipment and reducing the risk of equipment damage and maintenance costs caused by circuit failures.

[0070] Furthermore, this innovative structural design is conducive to improving the service life of the entire circuit breaker. By reducing unnecessary mechanical wear and electrical shock caused by false operation, each component can operate under more stable and reasonable working conditions, extending the replacement cycle of key components such as locks, pull rods, and double metals. In the long run, it reduces the maintenance cost and operating cost of the power system and improves economic benefits.

[0071] In summary, the dual-metal mechanism of the present invention has extremely significant advantages in improving the performance of the circuit breaker, ensuring the safe and stable operation of the power system, and reducing the overall cost, and has good market application prospects and social benefits.

[0072] Among them, the pull rod as a whole is a flat strip structure, with a connecting long groove on one end, a bent connecting part on the other end, and a guiding long groove in the middle. The bent connecting part passes through the long groove to be connected with the double metal on the other side. For double P circuit breakers, the overall thickness of the circuit breaker can be reduced.

[0073] Specifically, the double metal is arranged on the back of the middle seat shell, and one end thereof is connected to an arc-starting piece 110. The bottom of the arc-starting piece 110 has a positioning protrusion 112, and the middle seat shell is provided with a positioning groove 113 that is plugged into and matched with the positioning protrusion.

[0074] In this embodiment, the double metal is arranged on the back of the middle base shell and connected to the arc-striking piece. The positioning protrusion at the bottom of the arc-striking piece is plugged into the positioning groove of the middle base shell, so that the arc-striking piece is installed more stably. When the circuit breaker breaks the circuit and generates an arc, the arc can be effectively guided, the efficiency of arc extinguishing can be improved, the risk of arc damage to other internal components of the circuit breaker can be reduced, and the service life of the circuit breaker can be extended. At the same time, the overall layout structure of the double metal and the arc-striking piece on the middle base shell is optimized, the compactness and coordination of the mechanism are enhanced, and the overall thickness of the circuit breaker can be reduced.

[0075] Specifically, it also includes an experimental button 30, a reset elastic member 31, a power-taking torsion spring 32 and a power-taking plate 33. The power-taking plate 33 is connected to the bottom shell of the circuit breaker. The power-taking torsion spring is sleeved on the hole column 34 on the bottom shell of the circuit breaker. The upper end of the power-taking torsion spring has a power-taking part 35 located above the power-taking plate. The lower end of the power-taking torsion spring has a connecting part 36 extending to the side of the moving contact. When the experimental button is pressed down, the experimental button can press the power-taking part down to make the power-taking part and the power-taking plate abut against each other to achieve electrical connection. The connecting part can only contact the moving contact to achieve electrical connection when the circuit breaker is closed.

[0076] In this embodiment, the power-taking torsion spring is cleverly coordinated with the test button, the power-taking sheet, and the moving contact to achieve effective control of the power-taking of the test button. When the test button is pressed down, the electrical connection between the power-taking part and the power-taking sheet can be accurately triggered, and whether the test circuit is fully conducted is determined by whether the connection part is in contact with the moving contact according to the opening and closing state of the circuit breaker, ensuring that the test circuit can only be powered normally due to the operation of the test button when the circuit breaker is closed, effectively avoiding the risk of abnormal circuit conduction caused by misoperation of the test button in the open state, improving the safety and reliability of the circuit breaker operation, and at the same time rationally utilizing the internal space of the circuit breaker to make the overall structure more compact and orderly.

[0077] Among them, since the connection part is set on the side of the moving contact, when the moving contact is not closed, the connection part and the moving contact are not in contact, and the two are not conducting. Therefore, even if the test button is pressed down, no path will be formed. Only when the switch is closed, the moving contact moves closer to the side of the connection part, so that the moving contact and the connection part are against each other to achieve electrical connection between the two. At this time, the test button is pressed down to form a test path.

[0078] The working principle of the circuit breaker experimental button power supply structure:

[0079] When the circuit breaker is in the closed state, the moving contact is in the closed position, and the connecting part at the lower end of the power torsion spring can be in contact with the moving contact for electrical connection. At this time, if the test button is pressed, the pressing part of the test button will press down the power-taking part of the power torsion spring, so that it will be against the power-taking piece to achieve electrical connection. A current path is formed from the first terminal of the circuit breaker through the power-taking piece, the power torsion spring, the connecting part, the moving contact to the second terminal, thereby providing power for the experimental circuit to perform relevant tests such as leakage protection function.

[0080] When the circuit breaker is in the open state, the moving contact is separated. Although pressing the experimental button can make the power-taking part contact with the power-taking piece, since the connecting part is not in contact with the moving contact, a complete current loop cannot be formed and the experimental circuit will not be conductive.

[0081] Specifically, it also includes a positioning mechanism for positioning the connecting part, the positioning mechanism includes a guide column 1 37 located below the hole column and a guide column 2 38 and a guide column 39 spaced apart and obliquely below the guide column 1 37, and the connecting part of the power-taking torsion spring extends from the side surface of the guide column 1 and the clamping groove between the guide column 2 and the guide column 3 to the side surface of the moving contact.

[0082] In this embodiment, the positioning structure composed of guide pillars 1, 2 and 3 provides a specific guide and limit path for the connecting part of the power-taking torsion spring. The connecting part extends from the side of guide pillar 1 and the clamping groove between guide pillars 2 and 3 to the side of the moving contact. This layout makes the connecting part subject to clear constraints and guidance during movement, ensuring that it can accurately cooperate with the moving contact during the opening and closing actions of the circuit breaker and the operation of the test button, further enhancing the reliability and stability of the power-taking structure, and simplifying the assembly process, because the guide pillar structure can be integrally formed or simply assembled during the production of the circuit breaker bottom shell, which is convenient for large-scale production and manufacturing, reducing production costs and improving production efficiency.

[0083] Specifically, a pressing portion 40 is extended from one side of the experimental button, and an engaging opening 41 engaged with the power taking part is provided on the pressing portion 40 .

[0084] In this embodiment, the pressing action part extending from one side of the test button and the engaging opening provided thereon and engaged with the power taking part enable the test button to more stably and effectively transfer force to the power taking part of the power taking torsion spring during the pressing operation. When the test button is pressed, the engagement of the engaging opening with the power taking part ensures the accuracy of the force transmission direction and the point of action, so that the power taking part can accurately contact the power taking sheet to achieve electrical connection according to the design requirements, avoiding power taking failure or abnormality caused by the dispersion or deviation of the force during the pressing process, improving the sensitivity and reliability of the test button operation, optimizing the user operation experience, and making the detection operation of the circuit breaker leakage protection function more convenient, efficient and accurate.

[0085] Specifically, a spring step 42 is provided on the bottom shell of the circuit breaker below the test button, one end of the reset elastic member is connected to the spring step, and the other end is connected to the lower end of the test button.

[0086] In this embodiment, the spring step on the bottom shell of the circuit breaker below the test button and the reset elastic member connected thereto provide a reliable reset function for the test button. When the test button is released, the reset elastic member can quickly restore the test button to its initial position, while driving the power-taking part of the power-taking torsion spring to break away from the contact with the power-taking sheet, and timely cut off the test circuit, ensuring that the test circuit is in a disconnected state when not in the detection state, improving the safety of the circuit, and this structural design is simple and effective, without the need for complex mechanical or electronic reset devices, reducing production costs and structural complexity, improving product stability and reliability, and reducing the risk of equipment abnormality caused by reset failures.

[0087] Specifically, the power extraction piece is electrically connected to the first terminal 44 of the circuit breaker through a wire 43, and the moving contact is electrically connected to the second terminal 45 of the circuit breaker.

[0088] In this embodiment, the power taking piece is electrically connected to the first terminal of the circuit breaker through a wire, and the moving contact is electrically connected to the second terminal of the circuit breaker, thereby establishing a clear electrical connection relationship between the experimental button power taking structure and the main circuit of the circuit breaker.

[0089] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the concept of the present invention is not limited to this invention, and any modification using the concept of the present invention will be included in the scope of protection of this patent right.

Claims

1. A 2P leakage circuit breaker, comprising a circuit breaker bottom shell, a middle base shell, an upper cover, an operating handle, a tripping mechanism, a short-circuit release, a leakage release, a magnetic ring, an arc extinguishing assembly, a circuit board assembly and a double metal mechanism, characterized in that: The breaker also includes a return spring fixed on the bottom shell of the circuit breaker, the tripping mechanism includes a contact seat rotatably connected to the rotating shaft 1 of the bottom shell of the circuit breaker, a jumper rotatably connected to the rotating shaft 2 at the upper end of the contact seat, a locker rotatably connected to the rotating shaft 3 below the contact seat, a moving contact rotatably connected to the rotating shaft 4 on both sides of the lower end of the contact seat, a locker torsion spring sleeved on the rotating shaft 3 and a contact torsion spring sleeved on the rotating shaft 4, the operating handle and the jumper are connected through a connecting rod, the jumper and the locker are provided with mutually engaged engaging steps, the lower end of the locker has an action bending section bypassing from the lower end of the contact seat and bending toward one side of the short-circuit releaser, the action bending section is provided with an action surface that interacts with the output end of the short-circuit releaser, one side of the contact seat is provided with a slot for engaging with the return spring, the top of the return spring extends to the top rod of the leakage releaser, and the return spring has an elastic force to press the top rod back into the leakage releaser; A through slot is provided on one side of the middle base shell, the short-circuit releaser and the leakage releaser are stacked above the through slot, the circuit board assembly is arranged on the side of the short-circuit releaser and the leakage releaser, and the magnetic ring is arranged below the short-circuit releaser and the leakage releaser.

2. The 2P leakage circuit breaker according to claim 1, characterized in that: One end of the lock torsion spring is connected to the torsion spring step 1 on the lock, and the other end is connected to the torsion spring step 2 on the contact seat. One end of the contact torsion spring is connected to the torsion spring step 2, and the other end is connected to the moving contact.

3. The 2P leakage circuit breaker according to claim 1, characterized in that: The leakage release comprises a shell, a base, and a coil support, a yoke, a magnet, an armature, a push rod and a metal support member arranged in the shell. The yoke is a U-shaped structure. The yoke comprises a first arm and a second arm. The magnet is arranged between the first arm and the second arm of the yoke. The coil frame is sleeved on the first arm and a coil is wound on the coil frame. The armature is horizontally arranged on the yoke. One end of the push rod is in contact with the armature and cooperates with the armature, and the other end passes through the shell. It also includes an elastic member and a first spring base, wherein the first spring base is fixed on the armature, a second spring base and abutment step are provided on the upper end of the metal support member, one end of the elastic member is connected to the first spring base, and the other end is connected to the second spring base, and one end of the armature is against the abutment step.

4. The 2P leakage circuit breaker according to claim 1, characterized in that: The double-metal mechanism includes a pull rod and a double metal, the pull rod is provided with a connecting long slot, a guiding long slot and a bending connection part, the lock buckle is provided with a connecting column movably connected to the connecting long slot, the middle seat shell is provided with a through slot, the bending connection part is connected to the double metal after passing through the through slot, a guide column movably connected to the guiding long slot is provided on one side of the through slot, and a movable gap is left between the connecting long slot and the connecting column, and between the guiding long slot and the guide column.

5. The 2P leakage circuit breaker according to claim 4, characterized in that: The double metal is arranged on the back of the middle seat shell, one end of which is connected with an arc-starting piece, the bottom of the arc-starting piece is provided with a positioning protrusion, and the middle seat shell is provided with a positioning groove for plugging and matching with the positioning protrusion.

6. The 2P residual current circuit breaker according to claim 1, characterized in that: It also includes an experimental button, a reset elastic member, a power-taking torsion spring and a power-taking sheet, wherein the power-taking sheet is connected to the bottom shell of the circuit breaker, and the power-taking torsion spring is mounted on the hole column on the bottom shell of the circuit breaker. The upper end of the power-taking torsion spring has a power-taking part located above the power-taking sheet, and the lower end of the power-taking torsion spring has a connecting part extending to the side of the moving contact. When the experimental button is pressed down, the experimental button can press the power-taking part down so that the power-taking part and the power-taking sheet are abutted to achieve electrical connection, and the connecting part can only contact the moving contact to achieve electrical connection when the circuit breaker is closed.

7. The 2P residual current circuit breaker according to claim 6, characterized in that: It also includes a positioning mechanism for positioning the connecting part, the positioning mechanism includes a guide column 1 located below the hole column and a guide column 2 and a guide column 3 spaced apart and arranged obliquely below the guide column 1, and the connecting part of the power-taking torsion spring extends from the side of the guide column 1 and the clamping groove between the guide column 2 and the guide column 3 to the side of the moving contact.

8. The 2P residual current circuit breaker according to claim 7, characterized in that: A pressing action portion is extended from one side of the experimental button, and an engaging opening engaged with the power taking part is provided on the pressing action portion.

9. The 2P residual current circuit breaker according to claim 8, characterized in that: A spring step is arranged on the bottom shell of the circuit breaker below the test button, one end of the reset elastic member is connected to the spring step, and the other end is connected to the lower end of the test button.

10. The 2P residual current circuit breaker according to claim 9, characterized in that: The power extraction piece is electrically connected to the first terminal of the circuit breaker through a wire, and the moving contact is electrically connected to the second terminal of the circuit breaker.

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