Miniature circuit breaker

Abstract

The utility model provides a miniature circuit breaker, which comprises a shell provided with a first area positioned in the middle, and a second area and a third area which are respectively arranged on the left side and the right side of the first area; the knob is positioned in the middle of the first area and is connected with the driving tripping mechanism through a link rod; the contact mechanism comprises a static contact located below the driving tripping mechanism and a moving contact assembly rotationally installed on the shell; and the energy storage mechanism and the driving tripping mechanism are arranged in the first area and arranged on the left side and the right side of the rotary knob respectively, and the energy storage mechanism is matched with the driving tripping mechanism and used for increasing the closing speed of the moving contact assembly. Therefore, even if the circuit breaker is installed in a narrow space, the knob can be manually operated conveniently. In addition, through the arrangement of the energy storage mechanism, the movable contact and the static contact can be rapidly connected, the phenomenon that the contact is ablated or fusion welded due to high temperature due to the fact that the contact is connected or disconnected due to human factors is avoided, and the service life of the circuit breaker is prolonged.

Description

Technical Field

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

[0002] A miniature circuit breaker is a low-voltage protective device used in power distribution systems to connect or interrupt load lines. It has both a manual switch function and the ability to automatically perform overload, short circuit, and leakage protection.

[0003] The shell of the small circuit breaker includes a first area located in the middle, and second areas arranged on both sides of the first area. The second area is equipped with wiring terminals, and the first area is equipped with an operating mechanism, a contact mechanism and an arc extinguishing chamber. The operating mechanism includes a knob, a connecting rod and a driving tripping mechanism. The traditional knob is installed on the side of the first area, that is, it is arranged close to the side wall of the shell. In this way, when the circuit breaker is installed in a narrow space, it is inconvenient to reach in and rotate the knob, which has the defect of inconvenient manual operation. In addition, there are uncontrollable factors in the manual closing process, and the closing speed is completely affected by human factors. For example, if the human hand closes the circuit at a slower speed, the moving and static contacts contact at a slow speed, resulting in a phenomenon of seeming to be connected but not connected, and there is a risk of contact ablation or even welding, which shortens the service life of the circuit breaker. Utility Model Content

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defect of the prior art that it is inconvenient to manually operate the knob in a narrow space, thereby providing a small circuit breaker that is easy to operate.

[0005] To this end, the utility model provides a small circuit breaker, including a shell, a knob, a contact mechanism, an energy storage mechanism and a drive tripping mechanism, the shell having a first area located in the middle, and a second area and a third area respectively arranged on the left and right sides of the first area; the knob is located in the middle of the first area and is connected to the drive tripping mechanism through a connecting rod; the contact mechanism includes a static contact located below the drive tripping mechanism and a moving contact assembly rotatably installed in the shell; the energy storage mechanism and the drive tripping mechanism are arranged in the first area and respectively arranged on the left and right sides of the knob, and the energy storage mechanism cooperates with the drive tripping mechanism to increase the closing speed of the moving contact assembly.

[0006] The driving tripping mechanism includes a rotating wheel rotatably mounted on the housing, and a first elastic member is provided between the rotating wheel and the moving contact assembly; an energy storage mechanism includes a first locking member and a second elastic member, the first locking member can be installed on the housing in a translational manner, and has a locking position in which it cooperates with the moving contact assembly and is locked, and an unlocking position driven by the knob and separated from the moving contact assembly, and the second elastic member applies an elastic force in the direction of the locking position to the first locking member for translation; during the closing process, the moving contact assembly has a first state in which it is linked with the rotating wheel and rotates toward the static contact, a second state in which it cooperates with the first locking member and locks and maintains a constant distance with the static contact, and a third state in which it is unlocked from the first locking member and is in contact and communication with the static contact, wherein when the moving contact assembly is in the second state, the rotating wheel rotates relative to the moving contact assembly, and the first elastic member stores energy; after the moving contact assembly is unlocked from the first locking member, the first elastic member releases energy.

[0007] The moving contact assembly has moving contacts and limit blocks respectively arranged at two ends thereof, and one end of the first locking member adjacent to the moving contact assembly is provided with a stopper which can abut against the limit block.

[0008] The knob has a protrusion which abuts against the first locking member and drives the first locking member to translate toward the unlocking position.

[0009] The driving tripping mechanism also includes a jump buckle and a third elastic member, one end of the third elastic member is against the jump buckle, and the other end is against the rotating wheel. A locking opening for inserting the end of the connecting rod is formed between the jump buckle and the rotating wheel under the elastic force of the third elastic member.

[0010] The shell is also provided with a leakage tripping mechanism, which includes a first electromagnet and a first pull rod. The first electromagnet is arranged in the third area, and includes a first coil, a first moving iron core and a first static iron core. When leakage occurs, the first coil will be energized, and the first moving iron core will move toward the first static iron core under the action of the magnetic field. The end of the first moving iron core away from the first static iron core is provided with a first hanging hole; the first pull rod is movably mounted on the support frame, and has a first hook and a second hook respectively arranged at its two ends. The first hook is hooked and connected to the first hanging hole, and the second hook is suitable for driving the tripping and unlocking of the driving tripping mechanism.

[0011] An overcurrent tripping mechanism is also provided in the shell, and the overcurrent tripping mechanism is provided below the energy storage mechanism and on the left side of the drive tripping mechanism. The overcurrent tripping mechanism includes a second coil, a second moving iron core, a second static iron core and a push rod. The second coil, the second moving iron core and the second static iron core. When there is a leakage, the second coil will be energized, and the second moving iron core will move toward the second static iron core under the action of the magnetic field. A second hanging hole is provided at the end of the second moving iron core away from the second static iron core; the push rod is driven by the second moving iron core to drive the tripping to unlock.

[0012] An overload release mechanism is also provided in the shell, and the overload release mechanism is provided between the first area and the third area, and includes a bimetallic strip and a second pull rod, the second pull rod has a third hook and a fourth hook respectively provided at two ends thereof, the third hook is abutted against the top of the bimetallic strip, and the fourth hook extends into the hook groove of the tripping buckle.

[0013] A leakage indication mechanism is also provided in the shell, and the leakage indication mechanism includes a visible window, a leakage indicator and a second locking member. The visible window is provided in the first area on the shell and is located on the right side of the visible window; the leakage indicator is movably mounted on the shell through a fourth elastic member, and is provided with an indication part which can be arranged corresponding to the visible window, and the indication part has a first position corresponding to when the circuit breaker is working normally, and a second position corresponding to when the circuit breaker is leaking; the second locking member is movably mounted on the shell through a fifth elastic member, and has a locking position which is locked in cooperation with the leakage indicator when the circuit breaker is working normally, and an unlocking position which is separated from the leakage indicator under the drive of the first pull rod when the circuit breaker is leaking.

[0014] The end of the leakage indicator away from the indicating portion is provided with a first buckle, and the second locking member is provided with a second buckle that cooperates and locks with the first buckle.

[0015] The leakage indicator is rotatably mounted on the housing and has a first rotating arm and a second rotating arm located on both sides of its rotation center. The end of the first rotating arm is provided with the indicating portion, and the end of the second rotating arm is provided with the first buckle.

[0016] The second locking member is rotatably mounted on the housing, and has a third rotating arm and a fourth rotating arm located on both sides of its rotating center. The third rotating arm is provided with the second buckle, and the fourth rotating arm is driven by the first pull rod.

[0017] A pushing portion is provided in the middle of the first pull rod and can abut against the fourth rotating arm to drive the second locking member to unlock.

[0018] The technical solution of this utility model has the following advantages:

[0019] 1. The miniature circuit breaker provided by the utility model has a shell with a first area located in the middle, and a second area and a third area respectively arranged on the left and right sides of the first area. The knob is located in the middle of the first area, so that it is convenient to manually operate the knob even if the circuit breaker is installed in a narrow space; in addition, by setting an energy storage mechanism, the moving and static contacts can be quickly connected, avoiding the situation where the contacts are not connected due to human factors, resulting in the contact being burned or welded due to high temperature, thereby improving the service life of the circuit breaker.

[0020] 2. The energy storage mechanism of the miniature circuit breaker provided by the utility model includes a first locking member and a second elastic member. The first locking member can be installed on the housing in a translational manner. It has a locking position that cooperates with the moving contact assembly to lock, and an unlocking position that is driven by the knob and separated from the moving contact assembly. When closing the circuit, the knob drives the rotating wheel and the moving contact assembly to rotate through the connecting rod until the moving contact assembly is locked by the first locking member. The position of the moving contact remains stationary, and the rotating wheel continues to rotate relative to the moving contact assembly under the drive of the knob. The first elastic member accumulates energy. When the knob rotates to the position that drives the first locking member to separate from the moving contact assembly, the first elastic member releases energy, thereby quickly driving the moving contact assembly to contact and connect with the static contact. Compared with the prior art, the driving force for the connection of the moving and static contacts is generated by the action of the energy storage mechanism inside the circuit breaker itself, avoiding the situation that the contacts are seemingly connected but not connected due to human factors, resulting in the contact being ablated or welded due to high temperature, thereby improving the service life of the circuit breaker.

[0021] 3. The miniature circuit breaker provided by the utility model has a knob with a protrusion that abuts against the first locking member and drives it to translate toward the unlocking position. In the initial state of closing the switch, the protrusion of the knob and the first locking member are at a certain distance. When the knob is rotated by a certain angle, the protrusion abuts against the first locking member and drives the locking member to translate toward the unlocking position, so that the stopper of the locking member is separated from the limit block of the moving contact assembly, that is, the unlocking of the first locking member is achieved by the knob, which has the advantage of simple structure.

[0022] 4. The miniature circuit breaker provided by the utility model has a leakage indication mechanism comprising a leakage indication member, a second locking member and a first pull rod. When the circuit breaker works normally, the second locking member cooperates with the leakage indication member to lock, and the indication portion of the leakage indication member is in the first position. When leakage occurs, the first pull rod drives the second locking member to switch from the locked position to the unlocked position, that is, the second locking member contacts and locks with the leakage indication member, and the indication portion of the leakage indication member switches to the second position under the action of the fourth elastic member. In this way, the user can intuitively determine whether the circuit breaker trips due to leakage through the visual window, which is convenient for circuit maintenance.

[0023] 5. In the miniature circuit breaker provided by the utility model, a sliding portion is provided in the middle of the first pull rod, which can abut against the fourth rotating arm and drive the second locking member to unlock. In this way, the first pull rod can drive the leakage indicator to operate while driving the trip button to unlock, and the structure is simpler. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a miniature circuit breaker of the utility model;

[0026] Figure 2 is a schematic diagram of the structure of the shell;

[0027] Figure 3 It is a structural schematic diagram of the driving tripping mechanism and the energy storage mechanism (the circuit breaker is in the open state);

[0028] Figure 4 It is a structural schematic diagram of the driving tripping mechanism and the energy storage mechanism (the first locking member is in the locking position);

[0029] Figure 5 A schematic diagram of the structure of the driving tripping mechanism and the energy storage mechanism (the first locking member is in the unlocked position and the circuit breaker is closed);

[0030] Figure 6 It is a schematic diagram of the assembly of the overload release mechanism and the drive release mechanism;

[0031] Figure 7 It is a schematic diagram of the explosion structure of the energy storage mechanism and the driving release mechanism;

[0032] Figure 8 It is a schematic diagram of the structure of the leakage tripping mechanism, the overload tripping mechanism, the drive tripping mechanism and the overcurrent tripping mechanism;

[0033] Fig. 9 It is a structural schematic diagram of the leakage tripping mechanism and the driving tripping mechanism;

[0034] Fig.10 It is a structural schematic diagram of the leakage indication mechanism and the driving tripping mechanism (the leakage indication member is in the first position);

[0035] Fig.11 It is a structural schematic diagram of the leakage indication mechanism and the driving tripping mechanism (the leakage indication member is in the second position);

[0036] Fig.12 It is a schematic diagram of the explosion structure of the leakage indicator and the second locking member;

[0037] Fig.13 is a three-dimensional diagram of a first pull rod;

[0038] Fig.14 A perspective view of a circuit breaker.

[0039] Description of the accompanying drawings: 1. housing; 2. static contact; 3. moving contact assembly; 4. knob; 5. connecting rod; 6. rotating wheel; 7. first elastic member; 8. first locking member; 9. second elastic member; 10. moving contact; 11. limit block; 12. stop block; 13. protrusion; 14. first contact surface; 15. second contact surface; 16. slide groove; 17. jump buckle; 18. third elastic member; 19. locking opening; 20. moving contact frame; 21. moving contact; 22. first rotating shaft; 23. second convex column; 31. visual window; 32. second locking member; 33. indicating part; 34. fourth elastic member; 35. fifth elastic member; 36. leakage indicator; 38. first buckle tooth; 39. second buckle tooth; 40. first coil; 41. first rotating arm; 42. second rotating arm; 43. third rotating arm; 44 , the fourth rotating arm; 45, the first moving iron core; 46, the first static iron core; 47, the first pull rod; 48, the pushing part; 49, the hanging hole; 50, the first hook; 53, the first indicating part; 54, the second indicating part; 55, the circuit board assembly; 56, the second hook; 57, the third boss; 58, the bimetallic strip; 59, the second pull rod; 60, the third hook; 61, the fourth hook; 62, the hook groove; 63, the second coil; 64, the second moving iron core; 65, the second static iron core; 67, the push rod; 81, the first area; 82, the second area; 83, the third area; 84, the terminal; 101, the leakage tripping mechanism; 102, the driving tripping mechanism; 103, the overload tripping mechanism; 104, the overcurrent tripping mechanism; 105, the leakage indicating mechanism; 106, the energy storage mechanism; 107, the arc extinguishing chamber. DETAILED DESCRIPTION

[0040] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0041] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] Example

[0045] This embodiment provides a miniature circuit breaker, such as Figure 1 As shown, it includes a housing 1, a knob 4, a contact mechanism, an energy storage mechanism 106, a drive tripping mechanism 102, a leakage tripping mechanism 101, an overcurrent tripping mechanism 104, an overload tripping mechanism 103 and a leakage indication mechanism 105.

[0046] Shell 1, such as Figure 1 and Figure 2 As shown, it has a first area 81 located in the middle, and a second area 82 and a third area 83 respectively arranged on the left and right sides of the first area 81 , and the sides of the second area 82 and the third area 83 are both provided with connection terminals 84 .

[0047] The knob 4 is located in the middle of the first area 81 and is connected to the driving tripping mechanism 102 through the connecting rod 5. Figure 3As shown, the knob 4 has a protrusion 13 that abuts against the first locking member 8 of the energy storage mechanism and drives it to translate toward the unlocking position, and a second contact surface 15 that is arranged corresponding to the first contact surface 14, wherein when the first locking member 8 is in the locking position, the first contact surface 14 abuts against the second contact surface 15, thereby limiting the translation position of the first locking member 8. In this embodiment, the first contact surface 14 and the second contact surface 15 are arc-shaped contact surfaces that cooperate with each other, thereby reducing the friction between the knob 4 and the first locking member 8. The connecting rod 5 is a U-shaped rod, one end of which is inserted into the jack of the knob 4, and the other end can cooperate with the rotating wheel 6.

[0048] Contact mechanism, such as Figure 3 As shown, it includes a stationary contact 2 located below the driving tripping mechanism 102, and a moving contact assembly 3 rotatably mounted in the housing 1. In this embodiment, the moving contact assembly 3 includes a moving contact frame 20, and a moving contact 21 fixed on the moving contact frame 20, the stationary contact 2 is provided with a stationary contact, the moving contact 21 is provided with a moving contact 10 corresponding to the stationary contact, the moving contact frame 20 is made of plastic, and a limit block 11 is provided at the end of the moving contact frame 20 away from the moving contact 10, and the limit block 11 is a first convex column integrally formed on the moving contact frame 20. During the closing process, the moving contact assembly 3 has a first state (such as the first state) in which it is linked with the rotating wheel 6 and rotates toward the direction close to the stationary contact 2. Figure 3 ), and a second state (as shown) in which the first locking member 8 is locked and the distance with the static contact 2 is kept unchanged. Figure 4 ), and a third state (as shown) in which the first locking member 8 is unlocked and in contact with the static contact 2. Figure 5 As shown), wherein, when the moving contact assembly 3 is in the second state, the rotating wheel 6 rotates relative to the moving contact assembly 3, and the first elastic member 7 stores energy; after the moving contact assembly 3 is unlocked from the first locking member 8, the first elastic member 7 releases energy.

[0049] The energy storage mechanism 106 is disposed in the first area 81 and is located on the left side of the knob 4. The energy storage mechanism 106 cooperates with the driving tripping mechanism 102 to increase the closing speed of the contact assembly 3. Figure 3 , Figure 4 and Figure 5 As shown, the energy storage mechanism 106 includes a first locking member 8 and a second elastic member 9. The first locking member 8 can be installed on the housing 1 in a translational manner and has a locking position (such as Figure 4 As shown), and the unlocked position (as shown) driven by the knob 4 and separated from the moving contact assembly 3 Figure 5As shown). In this embodiment, the first locking member 8 has a stopper 12 adjacent to one end of the moving contact assembly 3 and capable of abutting against the limit block 11, and a first contact surface 14 adjacent to the knob 4, the first contact surface 14 being an arc surface. The second elastic member 9 is a compression spring, one end of which abuts against the inner wall of the housing 1, and the other end abuts against the first locking member 8, and the second elastic member 9 applies an elastic force to the first locking member 8 to translate in the direction of the locking position. Figure 2 As shown, a slide groove 16 is formed on the housing 1 for the first locking member 8 to slide left and right.

[0050] Drive the tripping mechanism 102, such as Figure 3 and Figure 7 As shown, it includes a rotating wheel 6, a jump button 17, a first elastic member 7 and a third elastic member 18. In this embodiment, the rotating wheel 6, the jump button 17 and the moving contact frame 20 all rotate around the same first rotating shaft 22, the first elastic member 7 is a tension spring, and the rotating wheel 6 drives the moving contact frame 20 to rotate through the tension spring, as shown in FIG. Figure 6 As shown, the rotating wheel 6 is formed with a second convex column 23 for hanging one end of the tension spring, and the moving contact frame 20 is formed with a hanging hole for hanging the other end of the tension spring. One end of the third elastic member 18 abuts against the jumper 17, and the other end abuts against the rotating wheel 6. Under the elastic force of the third elastic member 18, a locking opening 19 for inserting the end of the connecting rod 5 is formed between the jumper 17 and the rotating wheel 6. During the closing process, the end of the connecting rod 5 abuts against the locking opening 19, thereby driving the rotating wheel 6 to rotate in the closing direction; when a short circuit, overload, etc. occur, the jumper 17 rotates counterclockwise relative to the rotating wheel 6 under the action of an external force, thereby opening the locking opening 19, and the end of the connecting rod 5 moves out of the opened locking opening 19, and the rotating wheel 6 rotates in the opening direction under the action of the reset spring. It should be noted that, in addition to the driving tripping mechanism in this embodiment, there are various implementation schemes of the driving tripping mechanism in the prior art. Therefore, for those skilled in the art, the structure of the driving tripping mechanism can be adaptively changed.

[0051] Leakage tripping mechanism 101, such as Figure 8 and Fig. 9 As shown, it includes a first electromagnet and a first pull rod 47. The first electromagnet is arranged in the third area 83, and includes a first coil 40, a first moving iron core 45 and a first static iron core 46. When leakage occurs, the first coil 40 will be energized, and the first moving iron core 45 will move toward the first static iron core 46 under the force of the magnetic field. The end of the first moving iron core 45 away from the first static iron core 46 is provided with a first hanging hole 49; the first pull rod 47 is movably mounted on the support frame 51, as shown in FIG. Fig.13As shown, the housing 1 has a first hook 50 and a second hook 56 disposed at both ends thereof, the first hook 50 is hooked and connected with the first hanging hole 49, and the second hook 56 is suitable for driving the tripping button 17 of the driving tripping mechanism 102 to unlock. As shown in the figure, a circuit board assembly 55 is also disposed in the third area 83 of the housing 1, and the circuit board assembly 55 includes a circuit board and a zero-sequence transformer disposed on the circuit board.

[0052] The overload release mechanism 103 is disposed between the first area 81 and the third area 83. Figure 6 and Figure 8 As shown, it includes: a bimetallic strip 58; a second pull rod 59, having a third hook portion 60 and a fourth hook portion 61 respectively arranged at both ends thereof, the third hook portion 60 abuts against the top of the bimetallic strip 58, and the fourth hook portion 61 extends into the hook groove 62 of the jump buckle 17.

[0053] Overcurrent tripping mechanism 104, such as Figure 1 As shown, it is arranged below the energy storage mechanism 106 and on the left side of the driving tripping mechanism 102. Figure 8 As shown, the overcurrent tripping mechanism 104 includes: a second coil 63, a second moving iron core 64 and a second static iron core 65. When leakage occurs, the second coil 63 will be energized, and the second moving iron core 64 will move toward the second static iron core 65 under the force of the magnetic field; a push rod 67 is driven by the second moving iron core 64 to drive the tripping button 17 to unlock. An arc extinguishing chamber 107 is arranged below the overcurrent tripping mechanism 104.

[0054] Leakage indicating mechanism 105, such as Figure 1 and Fig.10 As shown, it includes a leakage indicator 36 , a second locking member 32 and a first pull rod 47 .

[0055] The leakage indicator 36 is movably mounted on the housing 1 through the fourth elastic member 34. Fig.14 As shown, it is provided with an indicator portion 33 which can be arranged corresponding to the visual window 31, and the indicator portion 33 has a first position corresponding to the normal operation of the circuit breaker and a second position corresponding to the leakage of the circuit breaker. The visual window 31 and the knob 4 are arranged on the same side of the housing 1. In this embodiment, as Fig.12As shown, the leakage indicator 36 is rotatably mounted on the housing 1, and has a first rotating arm 41 and a second rotating arm 42 located on both sides of its rotation center. The end of the first rotating arm 41 is provided with an indicating portion 33, and the end of the second rotating arm 42 is provided with a first buckle 38. The indicating portion 33 includes a first area 53 and a second area 54 for indicating closing and opening, respectively. The first area 53 is painted green, and the second area 54 is painted red. When the circuit breaker is working normally, the green first area 53 is set corresponding to the visual window 31; when there is leakage, the red second area 54 is set corresponding to the visual window 31. In this embodiment, the fourth elastic member 34 is a torsion spring, and the torsion spring body is sleeved on the rotation axis of the leakage indicator 36, and one end of the torsion spring abuts against the inner wall of the housing 1, and the other end abuts against the first rotating arm 41. The middle part of the first pull rod 47 is provided with a push portion 48 that can abut against the fourth rotating arm 44 and drive the second locking member 32 to unlock.

[0056] The second locking member 32 is movably mounted on the housing 1 through the fifth elastic member 35, and has a locking position corresponding to the normal operation of the circuit breaker and the leakage indicator 36, and an unlocking position corresponding to the separation of the leakage indicator 36 from the leakage indicator 36; in this embodiment, Fig.12 As shown, the second locking member 32 is rotatably mounted on the housing 1, and has a third rotating arm 43 and a fourth rotating arm 44 located on both sides of the rotation center thereof, the third rotating arm 43 is provided with the second buckle 39, and the fourth rotating arm 44 is driven by the first pull rod 47. In this embodiment, the fifth elastic member 35 is a torsion spring, the main body of which is sleeved on the rotation axis of the second locking member 32, and one end of the torsion spring abuts against the inner wall of the housing 1, and the other end abuts against the fourth rotating arm 44, and the fourth elastic member 34 and the fifth elastic member 35 jointly apply an elastic force to the leakage indicator 36 and the second locking member 32 to make the first buckle 38 and the second buckle 39 cooperate and lock. It should be noted that for those skilled in the art, the fourth elastic member 34 and the fifth elastic member 35 can also be set as compression springs, and the installation position of the compression springs can be changed accordingly.

[0057] The working principle of the circuit breaker of the utility model is as follows:

[0058] When the switch is closed: the knob 4 rotates clockwise under the action of external force, and the end of the link rod 5 abuts against the locking opening 19 of the driving tripping mechanism, thereby driving the rotating wheel 6 and the tripping buckle 17 to rotate clockwise around the first rotating shaft 22, and the rotating wheel 6 drives the moving contact assembly 3 to rotate in the direction close to the stationary contact 2 through the first elastic member 7; when the limit block 11 of the moving contact assembly 3 abuts against the stop block 12 of the first locking member 8, the position of the moving contact assembly 3 remains unchanged (that is, the distance between the moving contact 21 and the stationary contact 2 The distance remains unchanged), and the rotating wheel 6 continues to rotate clockwise under the action of the knob 4 and the connecting rod 5. During this process, the first elastic member 7 is stretched by the rotating wheel 6 to store energy; when the knob 4 is rotated until the protrusion 13 abuts against the first locking member 8, thereby driving the first locking member 8 to translate toward the left direction, the stopper 12 of the first locking member 8 is separated from the limit block 11 of the moving contact assembly 3, and the first elastic member 7 releases energy, thereby quickly driving the moving contact 21 of the moving contact assembly 3 to contact and communicate with the static contact 2.

[0059] When leakage occurs:

[0060] When the first coil 40 is energized, the first moving iron core 45 moves toward the direction close to the first static iron core 46 under the action of the magnetic field, thereby driving the first pull rod 47 to move toward the right side, and the push portion 48 of the first pull rod 47 abuts against the fourth rotating arm 44 of the second locking member 32, thereby driving the second locking member 32 to rotate counterclockwise, and the second clasp 39 of the second locking member 32 is separated from the first clasp 38 of the leakage indicator 36 (as shown in FIG. Fig.11 As shown), the leakage indicator 36 rotates counterclockwise under the action of the fourth elastic member 34, so that the second indicating portion 54 of the leakage indicator 36 is arranged corresponding to the visible window 31 of the housing 1.

[0061] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A miniature circuit breaker, characterized in that: include: The housing (1) comprises a first area (81) located in the middle, and a second area (82) and a third area (83) respectively arranged on the left and right sides of the first area (81); A knob (4) located in the middle of the first area (81) and connected to the driving release mechanism (102) via a connecting rod (5); A contact mechanism, comprising a stationary contact (2) located below the driving tripping mechanism (102), and a moving contact assembly (3) rotatably mounted in a housing (1); The energy storage mechanism (106) and the driving tripping mechanism (102) are arranged in the first area (81) and are respectively arranged on the left and right sides of the knob (4); the energy storage mechanism (106) cooperates with the driving tripping mechanism (102) to increase the closing speed of the moving contact assembly (3).

2. The miniature circuit breaker according to claim 1, characterized in that: The driving tripping mechanism (102) comprises a rotating wheel (6) rotatably mounted on the housing (1), and a first elastic member (7) is provided between the rotating wheel (6) and the moving contact assembly (3); An energy storage mechanism (106) comprises a first locking member (8) and a second elastic member (9), wherein the first locking member (8) is installed on the housing (1) in a translationally movable manner and has a locking position for locking with the moving contact assembly (3) and an unlocking position driven by the knob (4) and separated from the moving contact assembly (3), and the second elastic member (9) applies an elastic force to the first locking member (8) for translation in the direction of the locking position; During the closing process, the moving contact assembly (3) has a first state in which it is linked with the rotating wheel (6) and rotates toward the static contact (2); a second state in which it is locked with the first locking member (8) and maintains a constant distance with the static contact (2); and a third state in which it is in contact and connected with the static contact (2) after being unlocked from the first locking member (8). When the moving contact assembly (3) is in the second state, the rotating wheel (6) rotates relative to the moving contact assembly (3), and the first elastic member (7) stores energy; after the moving contact assembly (3) is unlocked from the first locking member (8), the first elastic member (7) releases energy.

3. The miniature circuit breaker according to claim 2, characterized in that: The moving contact assembly (3) has a moving contact point (10) and a limit block (11) respectively arranged at two ends thereof, and the first locking member (8) is provided with a stop block (12) at one end adjacent to the moving contact assembly (3) and capable of abutting against the limit block (11).

4. The miniature circuit breaker according to claim 2 or 3, characterized in that: The knob (4) has a protrusion (13) which abuts against the first locking member (8) and drives it to translate toward the unlocking position.

5. The miniature circuit breaker according to claim 2, characterized in that: The driving release mechanism (102) further comprises a jump button (17) and a third elastic member (18), one end of the third elastic member (18) being in contact with the jump button (17), and the other end of the third elastic member (18) being in contact with the rotating wheel (6), and a locking opening (19) for inserting the end of the connecting rod (5) is formed between the jump button (17) and the rotating wheel (6) under the elastic force of the third elastic member (18).

6. The miniature circuit breaker according to claim 1, characterized in that: The housing (1) is also provided with a leakage tripping mechanism (101), and the leakage tripping mechanism (101) comprises: A first electromagnet is arranged in the third area (83), comprising a first coil (40), a first moving iron core (45) and a first static iron core (46); when leakage occurs, the first coil (40) is energized, and the first moving iron core (45) moves toward the first static iron core (46) under the force of the magnetic field; and a first hanging hole (49) is provided at the end of the first moving iron core (45) away from the first static iron core (46); The first pull rod (47) is movably mounted on the support frame (51), and has a first hook portion (50) and a second hook portion (56) respectively arranged at two ends thereof, wherein the first hook portion (50) is hooked and connected to the first hanging hole (49), and the second hook portion (56) is suitable for driving the tripping buckle (17) of the driving tripping mechanism (102) to unlock.

7. The miniature circuit breaker according to claim 1, characterized in that: An overcurrent release mechanism (104) is also provided in the housing (1), the overcurrent release mechanism (104) being provided below the energy storage mechanism (106) and located on the left side of the drive release mechanism (102), the overcurrent release mechanism (104) comprising: A second coil (63), a second moving iron core (64) and a second static iron core (65); when leakage occurs, the second coil (63) will be energized, and the second moving iron core (64) will move towards the second static iron core (65) under the force of the magnetic field; and a second hanging hole (66) is provided at the end of the second moving iron core (64) away from the second static iron core (65); The push rod (67) is driven by the second moving iron core (64) to drive the trip button (17) to unlock.

8. The miniature circuit breaker according to claim 1, characterized in that: An overload release mechanism (103) is also provided in the housing (1). The overload release mechanism (103) is provided between the first area (81) and the third area (83), and comprises: Bimetallic strip (58); The second pull rod (59) has a third hook portion (60) and a fourth hook portion (61) respectively arranged at two ends thereof, wherein the third hook portion (60) abuts against the top of the bimetallic strip (58), and the fourth hook portion (61) extends into the hook groove (62) of the jump buckle (17).

9. The miniature circuit breaker according to claim 1, characterized in that: A leakage indication mechanism (105) is also provided in the housing (1), and the leakage indication mechanism (105) comprises: A visual window (31) is provided in the first area (81) on the housing (1) and is located on the right side of the visual window (31); A leakage indicator (36) is movably mounted on the housing (1) via a fourth elastic member (34), and is provided with an indicator portion (33) that can be arranged corresponding to the visual window (31), and the indicator portion (33) has a first position corresponding to when the circuit breaker is working normally, and a second position corresponding to when the circuit breaker is leaking; The second locking member (32) is movably mounted on the housing (1) via a fifth elastic member (35), and has a locking position for locking with the leakage indicator (36) when the circuit breaker is operating normally, and an unlocking position for separating from the leakage indicator (36) under the drive of the first pull rod (47) when the circuit breaker is leaking electricity.

10. The miniature circuit breaker according to claim 9, characterized in that: The end of the leakage indicator (36) away from the indicating portion (33) is provided with a first buckle (38), and the second locking member (32) is provided with a second buckle (39) that cooperates and locks with the first buckle (38).

11. The miniature circuit breaker according to claim 10, characterized in that: The leakage indicator (36) is rotatably mounted on the housing (1), and comprises a first rotating arm (41) and a second rotating arm (42) located on both sides of its rotation center, the end of the first rotating arm (41) being provided with the indicating portion (33), and the end of the second rotating arm (42) being provided with the first buckle (38).

12. The miniature circuit breaker according to claim 10 or 11, characterized in that: The second locking member (32) is rotatably mounted on the housing (1), and has a third rotating arm (43) and a fourth rotating arm (44) located on both sides of its rotation center, the third rotating arm (43) is provided with the second buckle (39), and the fourth rotating arm (44) is driven by the first pull rod (47).

13. The miniature circuit breaker according to claim 12, characterized in that: A push portion (48) is provided in the middle of the first pull rod (47) and can abut against the fourth rotating arm (44) to drive the second locking member (32) to unlock.

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