A molded case circuit breaker

Abstract

The present application discloses a molded case circuit breaker, which includes an operating mechanism, a dynamic contact structure, a magnetic flux release, and a transmission rod; the trigger end cooperates with the actuating portion of the magnetic flux release, the trip end cooperates with the operating mechanism, and the reset end cooperates with the dynamic contact structure; after the magnetic flux release is actuated, the trigger end is driven to rotate the transmission rod in a first rotation direction, and during the rotation, the trip end triggers the operating mechanism, so that the operating mechanism drives the dynamic contact structure to rotate toward an opening position; when the dynamic contact structure changes to the opening position, the dynamic contact structure pushes the reset end to rotate the transmission rod in a second rotation direction, and the trigger end drives the magnetic flux release to reset; the first reverse direction and the second rotation direction are opposite directions; the blocking portion blocks the transmission rod after the transmission rod rotates a predetermined distance in the second rotation direction to limit excessive rotation of the transmission rod; the predetermined distance means that the trigger end can complete the resetting of the magnetic flux release; the present application has the characteristic of protecting magnetic flux.

Description

Technical Field

[0001] The present application relates to the electrical field, and more particularly to a molded case circuit breaker. Background Art

[0002] In the field of molded case circuit breakers, magnetic flux releases are widely used as tripping devices. Simply providing a signal to turn them on can cause the circuit breaker's operating mechanism to trip. This signal can come from a variety of sources, including a host computer, leakage protection from the circuit board itself, or overload or short-circuit protection.

[0003] But after the magnetic flux release is actuated, it is often necessary to reset. Conventional reset mode, as shown in CN214378280U, relies on a lever in the operating mechanism, which is used to reset the tripper when it is released.

[0004] This reset method requires the circuit breaker to be re-closed to complete the reset, that is, the operating mechanism must be re-operated.

[0005] There are design possibilities for consistently resetting the flux release during the circuit breaker opening process. This approach reduces the operating force required for the user, eliminating the need to re-engage the magnetic flux release. However, the movable contact, for example, has a more uncertain range of motion than the operating mechanism, making it prone to excessive movement, causing the magnetic flux release to over-reset and potentially damaging its internal components.

[0006] Obviously, how to solve this problem is a direction worthy of research for the reset research of flux release. Summary of the Invention

[0007] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide a molded case circuit breaker.

[0008] The present application provides: a molded case circuit breaker, which includes:

[0009] An operating mechanism, used to perform closing and opening operations;

[0010] The dynamic contact structure has a closing position and an opening position. The dynamic contact structure is a rotating setting and is connected to the operating mechanism, and the position conversion is realized under the drive of the operating mechanism;

[0011] a flux release that actuates upon receipt of a signal;

[0012] The transmission rod is rotatably arranged and has a trigger end, a trip end, and a reset end located at the non-rotating center position of the transmission rod;

[0013] The trigger end cooperates with the actuating portion of the magnetic flux release, the trip end cooperates with the operating mechanism, and the reset end cooperates with the dynamic contact structure. After the magnetic flux release is actuated, the trigger end is driven to rotate the transmission rod in a first rotation direction. During the rotation, the trip end triggers the operating mechanism, causing the operating mechanism to drive the dynamic contact structure to rotate toward the open position. When the dynamic contact structure changes to the open position, the dynamic contact structure pushes the reset end to rotate the transmission rod in a second rotation direction, and the trigger end drives the magnetic flux release to reset. The first reverse direction and the second rotation direction are opposite directions.

[0014] The blocking portion is located on the trajectory of the transmission rod rotating in the second rotation direction, and blocks the transmission rod after the transmission rod rotates a predetermined distance in the second rotation direction to limit excessive rotation of the transmission rod; the predetermined distance refers to the trigger end being able to complete the resetting of the magnetic flux release.

[0015] In some embodiments of the present application, the blocking portion is arranged on a side of any one of the trigger end, the trip end, and the reset end that rotates in the second rotation direction.

[0016] In some embodiments of the present application, a circuit breaker housing is further included, and the blocking portion is integrally formed on the circuit breaker housing or fixed on the circuit breaker housing.

[0017] In some embodiments of the present application, the trip device further includes a magnetic flux cover, and the blocking portion is integrally formed on the magnetic flux cover or fixed on the magnetic flux cover.

[0018] In some embodiments of the present application, a magnetic flux mounting frame is further included, the magnetic flux release is fixed on the magnetic flux mounting frame, and the blocking portion is integrally formed on the magnetic flux mounting frame or fixed on the magnetic flux mounting frame.

[0019] In some embodiments of the present application, the operating mechanism further includes a mechanism bracket, and the blocking portion is integrally formed on the mechanism bracket or fixed on the mechanism bracket.

[0020] In some embodiments of the present application, the movable contact structure includes a movable contact and a rotating shaft, and the portion of the movable contact structure used to push the reset end is located on the movable contact and / or on the rotating shaft.

[0021] In some embodiments of the present application, the moving contact structure includes a moving contact and a rotating shaft. The moving contact is arranged in the rotating shaft. The moving contact extends from one side of the rotating shaft. The end of the rotating shaft extending away from the moving contact is the part of the moving contact structure used to push the reset end.

[0022] In some embodiments of the present application, the straight-line distance from the trigger end to the rotation center of the transmission rod is the first lever arm, the straight-line distance from the tripping end to the rotation center of the transmission rod is the second lever arm, and the straight-line distance from the reset end to the rotation center of the transmission rod is the third lever arm, and the third lever arm is greater than the first lever arm and greater than the second lever arm.

[0023] In some embodiments of the present application, the angle between the trigger end and the reset end is a first angle, the angle between the trigger end and the trip end is a second angle, and the angle between the trip end and the reset end is a third angle. The first angle is greater than the second angle, and the second angle is greater than the third angle.

[0024] In some embodiments of the present application, a reset spring is further included, which is connected to the transmission rod and is used to provide a biasing force for the transmission rod to rotate in a direction to reset the magnetic flux release.

[0025] In some embodiments of the present application, a circuit breaker housing is also included, which includes a base and a middle cover, wherein the base is located above the middle cover; the dynamic contact structure is located in the space formed by the base and the middle cover; the transmission rod is directly or indirectly rotated on the middle cover; a through hole is provided on the middle cover, and the reset end is located near the through hole. When the dynamic contact structure changes to the opening position, the dynamic contact structure uses the through hole to push the reset end to move.

[0026] In some embodiments of the present application, a magnetic flux mounting frame is further included, which is located on the middle cover and fixed to the circuit breaker housing, and the magnetic flux release is fixed in the magnetic flux mounting frame; a pivot portion is provided on the middle cover or the magnetic flux mounting frame, and the transmission rod forms a rotational connection with the pivot portion.

[0027] In some embodiments of the present application, in the first direction, the actuating portion of the magnetic flux tripper is higher than the pivoting portion, and the blocking portion is located between the actuating portion and the pivoting portion, or the actuating portion is located between the blocking portion and the pivoting portion.

[0028] In some embodiments of the present application, the pivoting portion is provided with spaced rotating seats and a through hole located between the two rotating seats, the transmission rod is rotatably connected to the rotating seat, and the reset end and the tripping end are respectively cooperated with the dynamic contact structure and the operating mechanism through the through hole.

[0029] In some embodiments of the present application, a magnetic flux mounting frame is provided with a magnetic flux mounting cavity and a shielding member, the magnetic flux mounting cavity has a mounting opening, and the magnetic flux release slides into the magnetic flux mounting cavity through the mounting opening; the shielding member is detachably fixed to the magnetic flux mounting frame and is used to block the mounting opening to limit the detachment of the magnetic flux release.

[0030] In some embodiments of the present application, a circuit assembly is further included, and the magnetic flux mounting frame further includes a wire clamping structure, and the leads of the magnetic flux release and / or the circuit assembly are passed through the wire clamping structure.

[0031] In some embodiments of the present application, a backup protector is also included. The backup protector includes an armature and a bracket. The armature is rotatably connected to the bracket through a rotating pin. The rotating pin has an interference fit portion, and the interference fit portion is inserted into the armature to form an interference fit.

[0032] Compared with the prior art, this application has the following advantages:

[0033] By utilizing a dynamic contact structure to reset the actuated flux release, and utilizing a blocking portion to rotate the transmission rod in the second rotational direction by a predetermined distance (the predetermined distance refers to the time it takes for the trigger end to reset the flux release), this structure eliminates the need for the operating mechanism to re-engage (the next time the circuit breaker is operated) as in the prior art. This allows for a very smooth resetting of the flux release, ensuring complete reset after each trip. The blocking portion design also ensures more stable resetting of the flux release, preventing damage to the flux release caused by excessive resetting. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without any creative work.

[0035] Figure 1 An axial view of a molded case circuit breaker according to an embodiment of the present application is shown;

[0036] Figure 2 The figure shows the magnetic flux release and the moving contact structure (closed state) in the molded case circuit breaker of the embodiment of the present application;

[0037] Figure 3 The figure shows the magnetic flux release and the moving contact structure (after actuation) in the molded case circuit breaker according to the embodiment of the present application.

[0038] Figure 4 The figure shows the magnetic flux release and the moving contact structure (after opening) in the molded case circuit breaker according to the embodiment of the present application.

[0039] Figure 5 A schematic diagram showing an actuated state (dashed line portion) and a reset state of a transmission rod and a magnetic flux release in a molded case circuit breaker according to an embodiment of the present application is shown;

[0040] Figure 6 A schematic diagram of a transmission rod in a molded case circuit breaker according to an embodiment of the present application is shown;

[0041] Figure 7 A partial enlarged view of the location where the transmission rod is arranged in the middle cover of the molded case circuit breaker according to an embodiment of the present application is shown;

[0042] Figure 8 A schematic diagram of a magnetic flux release and a magnetic flux mounting frame in a molded case circuit breaker according to an embodiment of the present application is shown;

[0043] Figure 9A schematic diagram of a magnetic flux mounting frame in a molded case circuit breaker according to an embodiment of the present application is shown;

[0044] Figure 10 A schematic diagram of a backup protector in a molded case circuit breaker according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0045] The following describes in detail embodiments of the present application. Examples of these embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals throughout represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended only to explain the present application and are not to be construed as limiting the present application.

[0046] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0048] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "electrically connected," and "fixed" should be interpreted broadly. For example, they may refer to fixed electrical connections, removable electrical connections, or integrated connections; they may refer to mechanical electrical connections or electrical electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal connections between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0049] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it can mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it can mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature. Example

[0050] like Figure 1 As shown, an embodiment of the present application is a molded case circuit breaker, which includes a circuit breaker housing 100, an operating mechanism 200, a moving contact structure 300 and a static contact.

[0051] The circuit breaker housing 100 is used to accommodate components such as the operating mechanism 200, the movable contact structure 300, and the static contact. The circuit breaker housing 100 here at least includes a base 110 and a middle cover 120, and the base 110 and the middle cover 120 are fastened together by screws.

[0052] The moving contact structure 300 and the static contact are accommodated in a space formed by the base 110 and the middle cover 120 .

[0053] like Figure 2 As shown, the movable contact structure 300 includes a rotating shaft 310 and a movable contact 320. The movable contact 320 is mounted on the rotating shaft 310, and the rotating shaft 310 is rotatable relative to the base 110. The movable contact structure 300 has a closed position and an open position. The closed position is where the movable contact 320 contacts the static contact, and the open position is where the movable contact 320 separates from the static contact and comes to rest.

[0054] like Figure 1 As shown, operating mechanism 200 is an operating mechanism for a molded case circuit breaker and includes components such as a handle, a lever, a tension spring, an upper connecting rod, a trip latch, a lock latch, a re-latch, and a pull rod 210. The trip latch, lock latch, and re-latch are used to achieve locking, allowing operating mechanism 200 to remain in the closed state after a closing operation. In the closed state, if the re-latch (pull rod 210) rotates, the three latches can be unlocked, and operating mechanism 200 can be transformed into the open state after an opening operation. During the next closing operation, after the re-latch is completed, the trip latch, lock latch, and re-latch can be re-locked, allowing the closing operation to be performed again, bringing operating mechanism 200 into the closed state. The operating principles of locking, unlocking, closing, and opening operations of the three latches of operating mechanism 200 are common knowledge and will not be elaborated here.

[0055] There are many reasons for the re-hooking (traction rod 210) to cause it to rotate, which are basically caused by the actuation of the release.

[0056] One of these is the activation of the magnetic flux release 400. There are many reasons why the magnetic flux release 400 can be activated, including leakage, overload, short circuit, or a shunt signal from the host computer. Of course, these various reasons do not necessarily apply simultaneously; only some of them may be present.

[0057] Regardless of the reason, the flux release 400 will be actuated after receiving the signal.

[0058] like Figure 2-Figure 4 As shown, the transmission rod 500 is rotatably arranged relative to the circuit breaker housing 100 .

[0059] The transmission rod 500 is arranged between the flux release 400 and is used to trigger the opening operation of the operating mechanism 200 (triggering the operating mechanism 200 after the flux release 400 is actuated, so that the operating mechanism 200 performs the opening operation) and reset the flux release 400 under the dynamic contact structure 300.

[0060] like Figure 2-Figure 4 As shown, the transmission rod 500 includes a trigger end 510, a trip end 520, and a reset end 530. The trigger end 510, the trip end 520, and the reset end 530 are located at a non-rotation center O of the transmission rod 500.

[0061] like Figure 2-Figure 4 As shown, the trigger end 510 cooperates with the actuating portion of the magnetic flux release 400 , the trip end 520 cooperates with the operating mechanism 200 , and the reset end 530 cooperates with the dynamic contact structure 300 .

[0062] The tripping action is as follows: after the magnetic flux release 400 is actuated, it drives the trigger end 510 to rotate the transmission rod 500 in the first rotation direction F1. During the rotation, the trip end 520 triggers the operating mechanism 200, causing the operating mechanism 200 to drive the dynamic contact structure 300 to rotate toward the opening position.

[0063] The reset action is as follows: when the dynamic contact structure 300 changes to the opening position, the dynamic contact structure 300 pushes the reset end 530 to make the transmission rod 500 rotate in the second rotation direction F2, and the trigger end 510 drives the magnetic flux release 400 to reset.

[0064] like Figure 3-Figure 4 As shown, the first rotation direction F1 and the second rotation direction F2 are two opposite rotation directions.

[0065] The above tripping and resetting actions are continuous, that is, reset is performed immediately after tripping. Compared with the prior art in which the flux release 400 is reset by the re-tripping action of the operating mechanism 200, this method completes the reset of the flux release 400 in the current operation (the prior art can only reset in the next operation).

[0066] like Figure 2-Figure 4 As shown, the blocking portion 600 is located on the trajectory of the transmission rod 500 rotating in the second rotational direction F2. After the transmission rod 500 rotates a predetermined distance D1 in the second rotational direction F2, the blocking portion 600 blocks the transmission rod 500 to prevent excessive rotation of the transmission rod 500. Here, the predetermined distance D1 refers to the distance that ensures that the trigger end 510 can completely reset the magnetic flux release 400.

[0067] like Figure 5 As shown, after the predetermined distance D1 has passed, the blocking portion 600 blocks the transmission rod 500, preventing it from further rotating in the second rotational direction F2, thereby preventing excessive resetting. Simply put, after the predetermined distance D1 has passed, even if there is still "force" on the transmission rod 500, the contact between the blocking portion 600 and the transmission rod 500 will absorb this force, preventing it from acting on the magnetic flux release 400. Therefore, the magnetic flux release 400 will not be damaged by excessive resetting.

[0068] like Figure 1 As shown, the transmission rod 500 also includes a return spring 700 to reset the magnetic flux trip. One end of the return spring 700 is connected to the transmission rod 500, while the other end remains relatively stationary. When the magnetic flux tripper 400 is actuated (the transmission rod 500 rotates in the first rotational direction F1), the return spring 700 deforms under the action of the transmission rod 500. When the transmission rod 500 rotates in the second rotational direction F2, the return spring 700 accelerates the rotation of the transmission rod 500, ensuring rapid resetting of the magnetic flux tripper 400. Furthermore, the presence of the return spring 700 ensures that the impact force on the transmission rod 500 during actuation of the magnetic flux tripper 400 is cushioned, ensuring a more stable operation. There are many options for the return spring 700. A torsion spring is preferred, but other options include tension springs, leaf springs, compression springs, and so on.

[0069] Here, there are many locations where the blocking portion 600 is set, or in other words, there are many specific locations where the blocking portion 600 blocks the transmission rod 500 .

[0070] like Figure 2-Figure 4As shown, it can be arranged on the side where the trigger end 510 rotates in the second rotation direction F2, and prevents the transmission rod 500 from resetting the magnetic flux release 400 by blocking the trigger end 510; it can also be arranged on the side where the tripping end 520 rotates in the second rotation direction F2, and prevents the transmission rod 500 from resetting the magnetic flux release 400 by blocking the tripping end 520; it can also be arranged on the side where the reset end 530 rotates in the second rotation direction F2, and prevents the transmission rod 500 from resetting the magnetic flux release 400 by blocking the reset end 530; or it can be other parts of the transmission rod 500, as long as it can block the transmission rod 500 and prevent excessive resetting.

[0071] As a more preferred method, in this embodiment, blocking is adopted on the trigger end 510 to prevent excessive resetting. This is because the trigger end 510 is the most direct acting on the actuating component of the flux release 400. Blocking it is the most direct and has the best effect in preventing excessive resetting.

[0072] The blocking portion 600 can be provided in a variety of configurations. It can be a part of the circuit breaker housing 100 (integrally formed) or fixed to the circuit breaker housing 100 (in separate components, assembled using other assembly structures such as screws). It can also be integrally formed on the magnetic flux cover (a portion of the housing of the magnetic flux trip 400 itself) or fixed to the magnetic flux cover (in separate components, assembled using other assembly structures such as screws). It can also be integrally formed on the mechanism bracket or fixed to the mechanism bracket (in separate components, assembled using other assembly structures such as screws). It can also be integrally formed on the magnetic flux mounting frame 800 or fixed to the magnetic flux mounting frame 800 (in separate components, assembled using other assembly structures such as screws). Regardless of the configuration, as long as the blocking portion 600 is stably provided and prevents excessive resetting, it will suffice.

[0073] like Figure 7-Figure 9 As shown, as a preferred embodiment, the magnetic flux mounting frame 800 is fixed to the magnetic flux mounting frame 800 through integral molding. In this manner, the magnetic flux release 400 is fixed to the magnetic flux mounting frame 800, which is in turn fixed to the circuit breaker housing 100. Here, the magnetic flux mounting frame 800 is fixed to the middle cover 120 using screws. Of course, the magnetic flux mounting frame 800 can also be fixed to other components of the circuit breaker housing 100 (such as the base 110).

[0074] like Figure 7-Figure 9As shown, the pivotal connection 810 is used to pivotally connect the transmission rod 500. In this embodiment, the pivotal connection 810 is an integral part of the magnetic flux mounting frame 800. This structure allows the magnetic flux release 400 and its mating transmission rod 500 to be mounted on the same component, facilitating product assembly and design. Of course, the pivotal connection 810 can also be independent of the magnetic flux mounting frame 800, or it can be directly fixed to the middle cover 120. The design of the pivotal connection 810 facilitates the assembly of the transmission rod 500.

[0075] like Figure 7-Figure 9 As shown, the pivoting portion 810 has spaced-apart rotating seats 820 and a through-hole 830 located between the two rotating seats 820. The transmission rod 500 also includes an intermediate portion 540, which forms a rotational connection with the two rotating seats 820. Here, an additional pin is used to penetrate the rotating seats 820 and the intermediate portion 540 to form a rotational connection. Of course, the pin and the intermediate portion 540 can also be made into an integrated structure. The through-hole 830 in the pivoting portion 810 is designed because the traction rod 210 and the dynamic contact structure 300 are located below the pivoting portion 810, so that the reset end 530 and the release end 520 can be inserted and mated.

[0076] like Figure 7-Figure 9 As shown, the blocking portion 600 is positioned between the actuating portion of the magnetic flux trip 400 and the pivoting portion 810. Specifically, this refers to the height direction (first direction). That is, the actuating portion of the magnetic flux trip 400 is higher than the blocking portion 600, and the blocking portion 600 is higher than the pivoting portion 810. This height design creates a more compact structure and also optimizes the positioning of the blocking portion 600, effectively preventing excessive resetting of the transmission rod 500. Of course, as long as the trigger end 510 is sufficiently long, the actuating portion of the magnetic flux trip 400 can alternatively be positioned between the blocking portion 600 and the pivoting portion 810.

[0077] like Figure 9 As shown, in order to prevent the leads of the flux release 400 or the leads of other circuit components of the circuit breaker from becoming disorganized, the flux mounting frame 800 further includes a wire clamping structure 840. The wire clamping structure 840 can be understood as a wire clamp or a hook, so that the leads can be threaded through the wire clamping structure 840. There can be one or more wire clamping structures 840. A larger number of wire clamping structures 840 is more conducive to organizing the leads.

[0078] like Figure 7-Figure 9As shown, for the installation of the flux release 400, the flux mounting frame 800 is provided with a flux mounting cavity 850 and a shielding member 860. The flux mounting cavity 850 has a mounting opening 870, which faces away from the traction rod 210. The flux release 400 is inserted into the mounting opening 870, allowing it to slide into the flux mounting cavity 850. The actuating portion (driving rod) of the flux release 400 extends from the avoidance opening on the flux mounting frame 800 to mate with the trigger end 510. The shielding member 860 and the flux mounting frame 800 are detachably engaged by screws, and the shielding member 860 can cover the mounting opening 870 to prevent the flux release 400 from detaching. Here, the shielding member 860 can also be fixed to the flux mounting frame 800 using a snap-on method. In order to ensure that the shielding member 860 is easy to install, a slide rail and a slide groove structure can also be set on the magnetic flux mounting frame 800 and the shielding member 860. Here, the installation opening 870 can also be opened in other directions.

[0079] The magnetic flux mounting frame 800 is fastened to the middle cover 120 by screws. In addition, it can also be fastened by other means or fastened to other components of the circuit breaker housing 100 .

[0080] like Figure 4 As shown, the primary power source for the reset flux release 400 relies on the rotating shaft 310 of the movable contact structure 300 to trigger the reset terminal 530. Using the rotating shaft 310 for triggering offers several advantages. The rotating shaft 310 is typically made of plastic, resulting in better insulation and poorer thermal conductivity, which prevents damage to the transmission rod 500 due to overheating or electrical corrosion. Of course, excluding insulation and thermal conductivity considerations and solely considering reset, the movable contact 320 can also be used to trigger the reset terminal 530.

[0081] like Figure 4 As shown, when the shaft 310 is used for reset, the main reason is that the end of the shaft 310 extending away from the movable contact 320 is the portion of the movable contact structure 300 used to push the reset end 530. This design fully utilizes this space without affecting the movable contact 320. At the same time, this portion is further away from the movable contact 320 and away from strong electricity than other portions.

[0082] like Figure 6As shown, in terms of the lever arm, the linear distance from the trigger end 510 to the rotation center O of the transmission rod 500 is the first lever arm L1, the linear distance from the trip end 520 to the rotation center O of the transmission rod 500 is the second lever arm L2, and the linear distance from the reset end 530 to the rotation center O of the transmission rod 500 is the third lever arm L3. The third lever arm L3 is greater than both the first lever arm L1 and the second lever arm L2. This lever arm design ensures that the rotating shaft 310 resets the magnetic flux release 400. Of course, the lever arm relationship is not limited to this design. Alternatively, the first lever arm L1 and the first lever arm L2 can both be greater than the third lever arm L3, or the first lever arm L1 can be greater than both the first lever arm L2 and the first lever arm L3. Regardless of the lever arm relationship, as long as the magnetic flux release 400 can be reset, it will be sufficient.

[0083] like Figure 6 As shown, regarding the positions of the three terminals, the angle between the trigger terminal 510 and the reset terminal 530 is a first angle A, the angle between the trigger terminal 510 and the trip terminal 520 is a second angle B, and the angle between the trip terminal 520 and the reset terminal 530 is a third angle C. The first angle A is greater than the second angle B, and the second angle B is greater than the third angle C. This arrangement better accommodates the positions of the flux release 400, the movable contact structure 300, and the operating mechanism 200, and provides a more compact overall structure. Of course, the first angle A, the second angle B, and the third angle C may also have other magnitude relationships, as long as they can accommodate the positions of the flux release 400, the movable contact structure 300, and the operating mechanism 200.

[0084] like Figure 7 As shown, the middle cover 120 has a through hole 130. This is because the dynamic contact structure 300 is arranged in the space between the middle cover 120 and the base 110. In order to ensure that the actuation and reset of the magnetic flux release 400 are more reasonable, the transmission rod 500 is arranged near the through hole 130, so that the reset end 530 of the transmission rod 500 can cooperate with the dynamic contact structure 300 using the through hole 130.

[0085] like Figure 3-Figure 4As shown, it is worth noting that the trigger end 510 and the actuating portion of the magnetic flux trip 400 are connected by abutment (basically maintaining consistent contact). Alternatively, the two can be connected by hooking or snapping. The reset end 530 and the movable contact structure 300 are not always connected. Instead, when the rotating shaft 310 of the movable contact structure 300 rotates to a certain position toward the open position, it triggers the reset end 530. The trip end 520 and the draw rod 210 of the operating mechanism 200 are also not always in contact. Instead, the trip end 520 triggers the draw rod 210 after the magnetic flux trip 400 is actuated (that is, after the transmission rod 500 rotates a certain angle in the first rotational direction F1), causing the operating mechanism 200 to trip. After the magnetic flux trip 400 is reset, the trip end 520 will no longer contact the draw rod 210.

[0086] like Figure 10 As shown, for the triggering pull rod 210, a backup protector is also provided within the circuit breaker housing 100. The backup protector comprises an armature 900, a yoke 910, a bracket 920, and a reset torsion spring 930. Both the armature 900 and the yoke 910 are U-shaped, with the bracket 920 positioned within the U-shaped yoke 910. The armature 900 is rotatably connected to the bracket 920 via a rotating pin 940. The reset torsion spring 930 is sleeved on the rotating pin 940 and abuts against the armature 900. The armature 900 has a striking portion 901. When a short circuit occurs in the circuit breaker's circuit, the armature 900 is attracted by the yoke 910 and rotates, causing the striking portion 901 to strike the pull rod 210. The rotating pin 940 has an interference fit portion 941, which inserts into the armature 900 to form an interference fit, ensuring a stable connection between the armature 900 and the rotating pin 940. Since the rotating pin 940 is provided with an interference fit portion 941 , the rotating pin 940 is similar to a stepped shaft. Of course, the interference fit portion 941 here is located at one end of the rotating pin 940 .

[0087] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise inconsistent.

[0088] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A molded case circuit breaker, characterized in that: include, An operating mechanism, used to perform closing and opening operations; The dynamic contact structure has a closing position and an opening position. The dynamic contact structure is a rotating setting and is connected to the operating mechanism, and the position conversion is realized under the drive of the operating mechanism; a flux release that actuates upon receipt of a signal; The transmission rod is rotatably arranged and has a trigger end, a trip end, and a reset end located at the non-rotating center position of the transmission rod; The trigger end cooperates with the actuating portion of the magnetic flux release, the trip end cooperates with the operating mechanism, and the reset end cooperates with the dynamic contact structure. After the magnetic flux release is actuated, the trigger end is driven to rotate the transmission rod in a first rotation direction. During the rotation, the trip end triggers the operating mechanism, causing the operating mechanism to drive the dynamic contact structure to rotate toward the open position. When the dynamic contact structure changes to the open position, the dynamic contact structure pushes the reset end to rotate the transmission rod in a second rotation direction, and the trigger end drives the magnetic flux release to reset. The first reverse direction and the second rotation direction are opposite directions. a blocking portion, located on a trajectory of the transmission rod rotating in the second rotation direction, and blocking the transmission rod after the transmission rod rotates a predetermined distance in the second rotation direction, so as to limit excessive rotation of the transmission rod; The predetermined distance refers to the time at which the trigger end can complete the resetting of the flux release.

2. The molded case circuit breaker according to claim 1, characterized in that: The blocking portion is arranged on a side of any one of the trigger end, the trip end and the reset end that rotates in the second rotation direction.

3. The molded case circuit breaker according to claim 1, characterized in that: It also includes a circuit breaker housing, and the blocking portion is integrally formed on the circuit breaker housing or fixed on the circuit breaker housing; Alternatively, the magnetic flux release further comprises a magnetic flux cover, and the blocking portion is integrally formed on the magnetic flux cover or fixed on the magnetic flux cover; Or, it further includes a magnetic flux mounting frame, the magnetic flux release is fixed on the magnetic flux mounting frame, and the blocking portion is integrally formed on the magnetic flux mounting frame or fixed on the magnetic flux mounting frame; Alternatively, the operating mechanism further includes a mechanism bracket, and the blocking portion is integrally formed on the mechanism bracket or fixed on the mechanism bracket.

4. The molded case circuit breaker according to claim 1, characterized in that: The movable contact structure includes a movable contact and a rotating shaft, and the portion of the movable contact structure used to push the reset end is located on the movable contact and / or on the rotating shaft; Alternatively, the moving contact structure includes a moving contact and a rotating shaft, the moving contact is arranged in the rotating shaft, the moving contact extends from one side of the rotating shaft, and the end of the rotating shaft extending away from the moving contact is the part of the moving contact structure used to push the reset end.

5. The molded case circuit breaker according to claim 1, characterized in that: The straight-line distance from the trigger end to the rotation center of the transmission rod is the first lever arm, the straight-line distance from the trip end to the rotation center of the transmission rod is the second lever arm, and the straight-line distance from the reset end to the rotation center of the transmission rod is the third lever arm. The third lever arm is greater than the first lever arm and greater than the second lever arm. Or / and, the angle between the trigger end and the reset end is a first angle, the angle between the trigger end and the trip end is a second angle, and the angle between the trip end and the reset end is a third angle, the first angle is greater than the second angle, and the second angle is greater than the third angle; And / or, a reset spring is further included, which is connected to the transmission rod and is used to provide a biasing force for the transmission rod to rotate in a direction to reset the magnetic flux release.

6. The molded case circuit breaker according to claim 1, characterized in that: The circuit breaker housing includes a base and a middle cover, wherein the base is located above the middle cover; the movable contact structure is located in a space formed by the base and the middle cover; The transmission rod is directly or indirectly rotated on the middle cover; a through hole is provided on the middle cover, and the reset end is located near the through hole. When the dynamic contact structure changes to the opening position, the dynamic contact structure uses the through hole to push the reset end to move.

7. The molded case circuit breaker according to claim 6, characterized in that: It also includes a flux mounting frame, which is located on the middle cover and fixed to the circuit breaker housing, and the flux release is fixed in the flux mounting frame; a pivot portion is provided on the middle cover or the flux mounting frame, and the transmission rod forms a rotational connection with the pivot portion.

8. The molded case circuit breaker according to claim 7, characterized in that: In the first direction, the actuating portion of the magnetic flux tripper is higher than the pivoting portion, and the blocking portion is located between the actuating portion and the pivoting portion, or the actuating portion is located between the blocking portion and the pivoting portion; And / or, the pivoting portion is provided with spaced rotating seats and a through hole between the two rotating seats, the transmission rod is rotatably connected to the rotating seat, and the reset end and the tripping end cooperate with the dynamic contact structure and the operating mechanism respectively through the through hole.

9. The molded case circuit breaker according to claim 7, characterized in that: The magnetic flux mounting frame is provided with a magnetic flux mounting cavity and a shielding member. The magnetic flux mounting cavity has a mounting opening, and the magnetic flux release slides into the magnetic flux mounting cavity through the mounting opening; the shielding member is detachably fixed to the magnetic flux mounting frame and is used to block the mounting opening to limit the magnetic flux release from detaching; And / or: it also includes a line component, the magnetic flux mounting frame also includes a wire clamping structure, and the leads of the magnetic flux release and / or the line component are inserted into the wire clamping structure.

10. The molded case circuit breaker according to claim 1, characterized in that: It also includes a backup protector, which includes an armature and a bracket. The armature is rotatably connected to the bracket through a rotating pin. The rotating pin has an interference fit portion, and the interference fit portion is inserted into the armature to form an interference fit.

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