Circuit breaker

Abstract

The utility model provides a circuit breaker, and relates to the technical field of electrical equipment. The circuit breaker comprises an operating mechanism, a tripping mechanism and a limiting piece. The operating mechanism comprises a lock catch, a contact support and a moving contact; the tripping mechanism comprises an armature. By arranging the first protruding part on the lock catch, arranging the second protruding part on the contact support and arranging the third protruding part on the armature, when a line where the circuit breaker is located breaks down, the third protruding part firstly changes the position of the lock catch through the first protruding part so that the lock catch can be unlocked, and then the position of the contact support is changed through the second protruding part so that the circuit breaker can be unlocked. The position of the moving contact is further changed, so that the moving contact and the static contact are quickly separated, the separation speed of the moving contact and the static contact is effectively improved, the quick breaking capacity of the circuit breaker under the overload or short circuit condition is further improved, and the influence on the use performance of the circuit breaker is reduced; in addition, the position where the armature is located when the circuit where the circuit breaker is located does not break down is limited through the limiting piece, and the use reliability of the circuit breaker is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of electrical equipment, and particularly relates to a circuit breaker. Background Art

[0002] A circuit breaker is a device that protects a circuit from faults such as overload or short circuit, and is widely used in power systems and industrial control. The main function of a circuit breaker is to cut off the circuit under abnormal current conditions to prevent equipment damage or fire accidents.

[0003] An electromagnetic release is one of the important components in a circuit breaker. When an overload or short circuit fault occurs in the circuit, the current in the circuit will increase sharply instantaneously. The current passing through the circuit breaker increases sharply, and the electromagnetic release generates a strong electromagnetic force to drive the operating mechanism of the circuit breaker, causing the moving contact to separate from the static contact, thereby cutting off the current and realizing the functions of short circuit protection and large current instantaneous protection.

[0004] In the related art, the electromagnetic release unlocks the latch of the operating mechanism by hitting it. When the latch is unlocked, the moving contact separates from the static contact under the action of elastic elements such as springs, thereby triggering the breaking action of the circuit breaker. However, in the existing design, the separation speed of the moving contact and the static contact is slow, and the circuit breaker cannot achieve effective fast tripping, which affects the performance of the circuit breaker. Summary of the Utility Model

[0005] This application provides a circuit breaker, which can accelerate the separation speed of the moving contact and the static contact, realize the fast tripping of the circuit breaker, and thus reduce the impact on the performance of the circuit breaker.

[0006] An embodiment of this application provides a circuit breaker, which includes an operating mechanism, a tripping mechanism, and a limiting member.

[0007] The operating mechanism includes a latch, a contact support, and a moving contact. The latch has a first protrusion, the contact support is connected to the moving contact, and the contact support has a second protrusion.

[0008] The tripping mechanism includes an armature. The armature has a third protrusion. The third protrusion is located above the first protrusion. The third protrusion is used to change the positions of the latch and the moving contact through the first protrusion and the second protrusion when a fault occurs in the circuit where the circuit breaker is located, so as to realize the tripping of the circuit breaker.

[0009] The limiting member is connected to the tripping mechanism and / or the housing of the circuit breaker, and the limiting member is used to limit the armature.

[0010] Through the above solution, a first protrusion is provided on the latch, a second protrusion is provided on the contact support, and a third protrusion is provided on the armature. When a fault occurs in the circuit where the circuit breaker is located, the third protrusion first changes the position of the latch through the first protrusion to unlock the latch, and then changes the position of the contact support through the second protrusion, thereby changing the position of the moving contact, so that the moving contact and the static contact are quickly separated, effectively improving the separation speed of the moving contact and the static contact, and further improving the quick breaking ability of the circuit breaker under overload or short circuit conditions, reducing the impact on the service performance of the circuit breaker; in addition, the position of the armature when no fault occurs in the circuit where the circuit breaker is located is restricted by a limiting member, avoiding the situation where the yoke cannot adsorb the armature, and ensuring the reliability of the circuit breaker in use.

[0011] In some embodiments, the tripping mechanism further includes a conductive plate, a yoke and an elastic member; the armature is rotatably connected to the yoke, and the conductive plate is fixedly connected to the yoke; both the armature and the yoke are connected to the elastic member.

[0012] Through the above solution, the tripping mechanism is jointly constituted by the armature, the conductive plate, the yoke and the elastic member. The number of parts of the tripping mechanism is small and it is convenient for assembly; and the armature is rotatably connected to the yoke, and the magnetic field generated on the yoke can directly act on the armature. The elastic member is connected between the armature and the yoke and can also directly act on the armature and generate a force opposite to the force of the yoke. This tripping mechanism has the characteristics of simple structure and stable cooperation.

[0013] In some embodiments, the conductive plate includes a wiring part, a conductive part and a static contact part; the wiring part is used to cooperate with the wiring frame of the circuit breaker to form a wiring terminal; the conductive part is used to connect the wiring part and the static contact part, and the conductive part is fixedly connected to the yoke; the static contact part is used to connect to the moving contact.

[0014] Through the above solution, the conductive plate is integrally formed by the wiring part, the conductive part and the static contact part, and the conductive part of the conductive plate is fixedly connected to the yoke, effectively reducing the number of parts of the tripping mechanism, and having the characteristics of compact structure and convenient assembly.

[0015] In some embodiments, a static contact and an arcing horn are provided on the static contact part; the static contact is connected to the moving contact; the arcing horn is located at the end of the static contact part far from the conductive part, and the arcing horn is integrally provided with the static contact part.

[0016] Through the above solution, by integrally arranging the arcing angle on the static contact part, the arc generated on the static contact part can move more smoothly along the arcing angle to the end of the arcing angle. Compared with the traditional way of separately arranging the static contact part and the arcing angle, this embodiment can reduce the action of the arc jumping from the static contact part to the arcing angle, and by integrally arranging the arcing angle and the static contact part, the structure of the conductive plate can be effectively simplified, and further the structure of the tripping mechanism can be simplified, making the assembly operation of the tripping mechanism more convenient.

[0017] In some embodiments, the yoke includes a bottom plate, and a first magnetic conductive plate and a second magnetic conductive plate symmetrically arranged on the bottom plate; the conductive plate is fixedly connected to the bottom plate; the armature is rotatably connected between the first magnetic conductive plate and the second magnetic conductive plate, and the armature is located at the opening position or the clapping position; wherein, when the circuit where the circuit breaker is located is normal, the armature is located at the opening position; when the circuit where the circuit breaker is located fails, the armature moves from the opening position to the clapping position, and changes the positions of the latch and the moving contact through the third protrusion, the first protrusion, and the second protrusion to achieve tripping of the circuit breaker.

[0018] Through the above solution, the armature is rotatably connected between the first magnetic conductive plate and the second magnetic conductive plate of the yoke, and the magnetic field generated on the yoke can directly act on the armature. The elastic member is connected between the armature and the yoke and can also directly act on the armature and generate a force opposite to that of the yoke. The tripping mechanism adopting this setting form has the characteristics of simple structure and stable cooperation.

[0019] In some embodiments, the armature has a mounting plate, and a first ear plate and a second ear plate are symmetrically arranged on the mounting plate; first mounting holes for the rotation shaft to pass through are formed on both the first ear plate and the second ear plate; second mounting holes for the rotation shaft to pass through are formed on both the first magnetic conductive plate and the second magnetic conductive plate; the armature is rotatably connected to the first magnetic conductive plate and the second magnetic conductive plate through the rotation shaft.

[0020] Through the above solution, the armature is rotationally matched with the yoke through the rotation shaft, enabling the armature to rotate more smoothly between the opening position and the clapping position, reducing the direct influence of the current passing through the conductive plate on the armature. In addition, it can also reduce the influence of dust or debris generated by rotational wear and other sundries on the normal rotation of the armature, improve the reliability of the rotation of the armature relative to the yoke, and ensure that the armature can rotate from the opening position to the clapping position in a timely manner.

[0021] In some embodiments, the limiting member includes a first limiting portion provided on the housing; when the armature is located at the opening position, the top surface of the third protrusion of the armature abuts against the bottom surface of the first limiting portion.

[0022] Through the above scheme, by setting the first limiting portion on the shell, the third protrusion is limited, and then the rotation range of the armature is limited, so as to avoid the yoke being unable to adsorb the armature when the line where the circuit breaker is located fails due to the large distance between the armature and the yoke, thereby ensuring the reliability of the circuit breaker.

[0023] In some embodiments, a first mounting column is provided on the second magnetic conductive plate; the limiting member includes a second limiting portion provided on the first mounting column; when the armature is located in the open position, the top surface of the armature abuts against the bottom surface of the second limiting portion.

[0024] Through the above scheme, by setting the second limiting part on the second magnetic conductive plate, the rotation range of the armature is limited, so as to avoid the yoke being unable to adsorb the armature when the line where the circuit breaker is located fails due to the large distance between the armature and the yoke, thereby ensuring the reliability of the circuit breaker.

[0025] In some embodiments, the elastic member is a tension spring; a second mounting column is provided on the armature; one end of the tension spring is connected to the first mounting column, and the other end of the tension spring is connected to the second mounting column.

[0026] Through the above scheme, a tension spring is set to apply a pulling force to the side of the armature away from the yoke, so that the armature can be maintained in the open position when the circuit breaker is in a closed state. When the magnetic field force applied by the yoke to the armature is greater than the pulling force of the tension spring, the armature rotates to the snap-on position. This can ensure the normal operation of the tripping mechanism, prevent the armature from shaking or rotating at will, causing the armature to rotate to the snap-on position prematurely, and improve the accuracy of the operation of the tripping mechanism.

[0027] In some embodiments, the elastic member is a torsion spring; the torsion spring is sleeved on the rotating shaft, one end of the torsion spring abuts against the mounting plate, and the other end of the torsion spring abuts against the bottom plate.

[0028] Through the above scheme, by setting the torsion spring, the armature can be kept in the open position when the circuit breaker is in the closed state. When the magnetic field force applied by the yoke to the armature is greater than the pulling force of the tension spring, the armature rotates to the snap-on position, which can ensure the normal operation of the tripping mechanism, prevent the armature from shaking or rotating randomly, causing the armature to rotate to the snap-on position in advance, and improve the accuracy of the operation of the tripping mechanism.

[0029] The above description is only an overview of the technical solution of the embodiment of the present application. In order to more clearly understand the technical means of the embodiment of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the embodiment of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of a circuit breaker provided by an embodiment of the present application.

[0031] Figure 2 It is Figure 1 an enlarged view of part A in

[0032] Figure 3 It is a schematic structural diagram of a connection structure between a conductive plate and a yoke provided by an embodiment of the present application.

[0033] Figure 4 It is a schematic structural diagram of a connection structure between a yoke and a second limiting part provided by an embodiment of the present application.

[0034] Figure 5 It is a schematic structural diagram of an armature provided by an embodiment of the present application.

[0035] Figure 6 It is a schematic structural diagram of a connection structure among an armature, a yoke and an elastic member provided by an embodiment of the present application.

[0036] Description of reference numerals:

[0037] 10. Housing;

[0038] 20. Operating mechanism;

[0039] 21. Lock; 22. Contact support; 23. Moving contact;

[0040] 211. First protruding part;

[0041] 221. Second protruding part;

[0042] 30. Tripping mechanism;

[0043] 31. Armature; 32. Conductive plate; 33. Yoke; 34. Elastic member;

[0044] 311. Third protruding part; 312. Mounting plate; 313. First ear plate; 314. Second ear plate; 315. First mounting hole; 316. Second mounting post;

[0045] 3161. Second hanging groove;

[0046] 321. Wiring part; 322. Conductive part; 323. Static contact part;

[0047] 3231. Static contact; 3232. Arc guiding angle;

[0048] 331. Base plate; 332. First magnetic conductive plate; 333. Second magnetic conductive plate; 334. Rotating shaft; 335. Second mounting hole; 336. First mounting post;

[0049] 3361. First hanging slot;

[0050] 40. Positioning member;

[0051] 41. First limiting portion; 42. Second limiting portion;

[0052] 50. Wiring frame;

[0053] OX. First direction; OY. Second direction. Detailed implementation manners

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application.

[0055] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the drawings are intended to cover non-exclusive inclusion.

[0056] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase "embodiment" appearing in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] The term "and / or" herein is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0058] The directional terms used in the following description are all the directions shown in the figures, and do not limit the specific structure of the current-limiting module of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the present application 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 construed as a limitation of the present application.

[0059] In addition, expressions such as the OX direction and the OY direction used to describe the directions indicating the operation and structure of the components of the circuit breaker in this embodiment are not absolute but relative. Although these indications are appropriate when the components of the circuit breaker are in the positions shown in the figures, when these positions change, these directions should have different interpretations to correspond to the changes.

[0060] In addition, the terms "first", "second", etc. in the specification and claims of the present application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more of such features.

[0061] In the description of the present application, unless otherwise specified, the meaning of "a plurality" refers to two or more (including two). Similarly, "a plurality of groups" refers to two or more groups (including two groups).

[0062] In the description of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "mounted", "connected", and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a mechanical structure may refer to a physical connection. For example, a physical connection may be a fixed connection, such as a fixed connection through a spacer, such as a fixed connection through screws, bolts or other spacers; a physical connection may also be a detachable connection, such as a snap connection or a snap-fit connection; a physical connection may also be an integral connection, such as a connection formed by welding, bonding or integrally molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0063] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings.

[0064] The electromagnetic release and the operating mechanism, as key structural components of a circuit breaker, play an important role in the process of interrupting short-circuit current. The design of the electromagnetic release and the operating mechanism has always been a key concern in the design and development of circuit breakers.

[0065] The electromagnetic release generally includes components such as an armature, a yoke, and an elastic member. The current-carrying member in the circuit breaker passes through the yoke, and the current can be used to generate a magnetic field in the yoke.

[0066] The operating mechanism generally includes components such as a latch, a trip latch, and a moving contact. The latch is a component used to keep the circuit breaker in the closed state. When the circuit breaker is in the closed state, the latch holds the moving contact in contact with the static contact, so that the circuit can work normally; under normal circumstances, the latch maintains the closed state of the circuit breaker through a spring or other mechanical force. Once acted upon by a release force (such as an electromagnetic release), the latch unlocks. The trip latch is a component in the circuit breaker that realizes the breaking function of the circuit breaker. The trip latch is connected to the latch. After the latch unlocks, the trip latch is activated, and the trip latch releases the moving contact, causing the moving contact to separate from the static contact, thereby completing the breaking action of the circuit breaker and making the circuit breaker in the open state.

[0067] When an overload or short-circuit fault occurs in the circuit where the circuit breaker is located, the current passing through the circuit breaker increases instantaneously, and the magnetic field generated on the yoke correspondingly increases. The magnetic field attracts the armature to act, and the armature applies an external force to the latch, causing the latch to unlock. The unlocking of the latch activates the trip latch, and the moving contact is released, and the moving contact gradually separates from the static contact, realizing the breaking of the circuit breaker.

[0068] Although the armature applies an external force to the latch to unlock the latch, the trip latch is activated, the moving contact is released, and the moving contact gradually separates from the static contact, which can realize the breaking of the circuit breaker. However, under the condition that the current passing through the circuit breaker far exceeds the normal current range, higher requirements are put forward for the separation speed of the moving contact and the static contact. The main reason is that: the separation speed of the moving contact and the static contact determines the breaking speed of the circuit breaker. In this way, if the circuit breaker cannot break quickly, it will weaken the protection effect of the circuit breaker on the circuit and affect the use performance of the circuit breaker.

[0069] Based on this, the embodiments of the present application provide a circuit breaker that can accelerate the separation speed of the moving contact and the static contact, realize the quick tripping of the circuit breaker, and thus reduce the impact on the use performance of the circuit breaker.

[0070] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0071] Figure 1 It is a schematic structural diagram of a circuit breaker provided by an embodiment of the present application, as Figure 1As shown in the figure, the circuit breaker includes an operating mechanism 20, a tripping mechanism 30, and a limiting member 40.

[0072] The operating mechanism 20 includes a latch 21, a contact support 22, and a moving contact 23. The latch 21 has a first protrusion 211. The contact support 22 is connected to the moving contact 23, and the contact support 22 has a second protrusion 221.

[0073] The tripping mechanism 30 includes an armature 31. The armature 31 has a third protrusion 311. The third protrusion 311 is located above the first protrusion 211. The third protrusion 311 is used to change the positions of the latch 21 and the moving contact 23 through the first protrusion 211 and the second protrusion 221 when a fault occurs in the circuit where the circuit breaker is located, so as to achieve the tripping of the circuit breaker.

[0074] The limiting member 40 is connected to the tripping mechanism 30 and / or the housing 10 of the circuit breaker. The limiting member 40 is used to limit the armature 31.

[0075] The housing 10 is a component in the circuit breaker for accommodating the operating mechanism 20, the tripping mechanism 30, the limiting member 40, etc.

[0076] Among them, the moving contact 23 is connected to the contact support 22. The connection manner between the moving contact 23 and the contact support 22 can refer to the connection manner between the moving contact 23 and the contact support 22 in the prior art, and this embodiment will not elaborate on this.

[0077] It should be noted that the latch 21 can be in the first position or the second position. When the latch 21 is in the first position, the latch 21 maintains the closed state of the circuit breaker; when the latch 21 is in the second position, the latch 21 is unlocked.

[0078] The moving contact 23 can be in the third position or the fourth position. When the moving contact 23 is in the third position, the latch 21 is in the first position, and the moving contact 23 is connected to the static contact 3231, and the circuit breaker is in the closed state; when the moving contact 23 is in the fourth position, the latch 21 is in the second position, and the moving contact 23 is separated from the static contact 3231, and the circuit breaker is in the open state.

[0079] Among them, the tripping mechanism 30 is used to trigger the tripping action of the circuit breaker when a fault occurs in the circuit where the circuit breaker is located. The armature 31 is a key moving component in the tripping mechanism. When a fault occurs in the circuit where the circuit breaker is located, the armature 31 is affected by the electromagnetic force, moves, and triggers the tripping action.

[0080] A third protrusion 311 that cooperates with the first protrusion 211 of the latch 21 and the second protrusion 221 of the contact support 22 is provided on the armature 31.

[0081] In one embodiment, as Figure 1As shown, the third protrusion 311 is located above the first protrusion 211, and the first protrusion 211 is located above the second protrusion 221, that is, the third protrusion 311, the first protrusion 211, and the second protrusion 221 are arranged in sequence along the first direction OX; and the projections of the first protrusion 211 and the second protrusion 221 along the first direction OX are both within the projection range of the third protrusion 311 along the first direction OX.

[0082] When there is no fault in the circuit where the circuit breaker is located, the latch 21 is in the first position, the moving contact 23 is in the third position, the moving contact 23 is connected to the static contact 3231, and the circuit breaker is in the closed state; when a fault occurs in the circuit where the circuit breaker is located, the armature 31 moves in the clockwise direction. During the process of the armature 31 moving in the clockwise direction, the armature 31 first hits the first protrusion 211 of the latch 21 through the third protrusion 311, causing the latch 21 to move from the first position to the second position in the counterclockwise direction, and the latch 21 is unlocked; after the latch 21 is unlocked, the armature 31 then hits the second protrusion 221 of the contact support 22 through the third protrusion 311, causing the contact support 22 to drive the moving contact 23 to move from the third position to the fourth position in the counterclockwise direction. In this case, the moving contact 23 is separated from the static contact 3231, so that the circuit breaker is in the open state.

[0083] Compared with the method of controlling the separation of the moving contact 23 and the static contact 3231 by the tripping mechanism 30 in the prior art, in this application, not only does the armature 31 apply an external force to the latch 21 to unlock the latch 21, but also the armature 31 applies an external force to the moving contact 23 to accelerate the separation speed of the moving contact 23 and the static contact 3231, effectively improving the fast tripping ability of the circuit breaker under overload or short - circuit conditions, ensuring that the equipment and the circuit can be protected in time, and reducing the impact on the use performance of the circuit breaker.

[0084] In another embodiment, when the first protrusion 211 is located below the second protrusion 221, the third protrusion 311 is located below the first protrusion 211, that is, the third protrusion 311, the first protrusion 211, and the second protrusion 221 are arranged in sequence along the opposite direction of the first direction OX. Correspondingly, the connection structure between the tripping mechanism 30 and the limiting member 40 also needs to be adjusted so that when a fault occurs in the circuit where the circuit breaker is located, the armature 31 can first hit the first protrusion 211 of the latch 21 through the third protrusion 311 to unlock the latch 21; after the latch 21 is unlocked, the armature 31 then hits the second protrusion 221 of the contact support 22 through the third protrusion 311, causing the contact support 22 to drive the moving contact 23 to be separated from the static contact 3231, so that the circuit breaker is in the open state.

[0085] It should be noted that the first protruding portion 211, the second protruding portion 221, and the third protruding portion 311 may also have other positional relationships, and this embodiment does not specifically limit this.

[0086] Among them, the limiting member 40 is used to limit the position of the armature 31 when no fault occurs in the circuit where the circuit breaker is located.

[0087] It should be noted that by limiting the position of the armature 31 when no fault occurs in the circuit where the circuit breaker is located through the limiting member 40, it is possible to prevent the armature 31 from being unable to sense the magnetic field generated by the yoke 33 due to an excessive rotation range, and avoid the situation where the yoke 33 cannot adsorb the armature 31.

[0088] In this embodiment, the limiting member 40 may be provided only on the tripping mechanism 30, or only on the housing 10, or may be provided on both the tripping mechanism 30 and the housing 10 at the same time. This embodiment does not specifically limit this.

[0089] In the embodiment of the present application, a first protruding portion 211 is provided on the latch 21, a second protruding portion 221 is provided on the contact support 22, and a third protruding portion 311 is provided on the armature 31. When a fault occurs in the circuit where the circuit breaker is located, the third protruding portion 311 first changes the position of the latch 21 through the first protruding portion 211 to unlock the latch 21, and then changes the position of the contact support 22 through the second protruding portion 221, thereby changing the position of the moving contact 22, so that the moving contact 22 is quickly separated from the static contact 3231, effectively improving the separation speed of the moving contact 22 and the static contact 3231, and further improving the quick breaking ability of the circuit breaker under overload or short circuit conditions, reducing the impact on the use performance of the circuit breaker; in addition, the position of the armature 31 when no fault occurs in the circuit where the circuit breaker is located is also limited by the limiting member 40, avoiding the situation where the yoke 33 cannot adsorb the armature 31, and ensuring the use reliability of the circuit breaker.

[0090] Figure 2 For Figure 1 the enlarged view of part A in. As Figure 1 and Figure 2 shown, in some embodiments, the tripping mechanism 30 further includes a conductive plate 32, a yoke 33, and an elastic member 34.

[0091] The armature 31 is rotatably connected to the yoke 33, and the conductive plate 32 is fixedly connected to the yoke 33.

[0092] Both the armature 31 and the yoke 33 are connected to the elastic member 34.

[0093] Among them, the conductive plate 32 is mainly used for conducting electricity in the circuit breaker, and the conductive plate 32 is arranged in a long strip plate-like structure. The conductive plate 32 can be connected to the wiring frame 50 of the circuit breaker to form a wiring terminal to achieve the function of accessing current.

[0094] Among them, the yoke 33 is used to guide and concentrate the magnetic field, so that under the action of the magnetic field force, the armature 31 can be driven to move to achieve the opening of the circuit breaker.

[0095] It should be noted that the conductive plate 32 is arranged close to the yoke 33, and a part of the conductive plate 32 is fixedly connected to the yoke 33. When the circuit breaker is in the closed state, there is current passing through the conductive plate 32. When the current flows through the part of the conductive plate 32 connected to the yoke 33, the magnetic effect of the current will act on the yoke 33 to form a magnetic field on the yoke 33.

[0096] When a fault occurs in the circuit where the circuit breaker is located, the current passing through the conductive plate 32 increases instantaneously, and the magnetic field generated on the yoke 33 increases accordingly. Correspondingly, the magnetic suction force exerted by the yoke 33 on the armature 31 increases, and the armature 31 moves (rotates clockwise) to achieve the opening of the circuit breaker.

[0097] Among them, one end of the elastic member 34 is connected to the armature 31, and the other end of the elastic member 34 is connected to the yoke 33.

[0098] It should be noted that the elastic member 34 is used to maintain the armature 31 at the position where the armature 31 is located when the circuit breaker is in the closed state, that is, the opening position of the armature 31.

[0099] In the embodiment of the present application, the trip mechanism 30 is jointly constituted by the armature 31, the conductive plate 32, the yoke 33 and the elastic member 34. The trip mechanism 30 has few parts and is convenient for assembly; and the armature 31 is rotatably connected to the yoke 33, and the magnetic field generated on the yoke 33 can directly act on the armature 31. The elastic member 34 is connected between the armature 31 and the yoke 33 and can also directly act on the armature 31 and generate a force opposite to the acting force of the yoke 33. The trip mechanism 30 has the characteristics of simple structure and stable cooperation.

[0100] Figure 3 It is a schematic diagram of the connection structure between a conductive plate and a yoke provided by an embodiment of the present application. As Figures 1 to 3 shown, in some embodiments, the conductive plate 32 includes a wiring portion 321, a conductive portion 322 and a static contact portion 323.

[0101] The wiring portion 321 is used to cooperate with the wiring frame 50 of the circuit breaker to form a wiring terminal.

[0102] The conductive portion 322 is used to connect the wiring portion 321 and the static contact portion 323, and the conductive portion 322 is fixedly connected to the yoke 33.

[0103] The static contact portion 323 is used to connect with the moving contact 23.

[0104] Among them, the wiring portion 321, the conductive portion 322 and the static contact portion 323 are integrally arranged.

[0105] It should be noted that the wiring part 321 is located at the first end of the conductive plate 32. The wiring part 321 can be connected to the wiring frame 50 in the circuit breaker to form a wiring terminal, realizing the function of accessing current.

[0106] The static contact part 323 is located at the second end of the conductive plate 32. The static contact part 323 can be connected to the moving contact 23. After the static contact 3231 on the static contact part 323 is connected to the moving contact 23, the circuit breaker is in the closed state. At this time, current passes through the conductive plate 32, thereby generating a magnetic field on the yoke 33.

[0107] The conductive part 322 is located between the wiring part 321 and the static contact part 323. When current passes through the conductive plate 32, the current passes through the conductive part 322 and forms a magnetic field on the yoke 33, so that the yoke 33 can provide an electromagnetic force to drive the armature 31 to move, realizing the tripping function of the tripping mechanism 30.

[0108] In the embodiment of the present application, the conductive plate 32 is integrally formed by the wiring part 321, the conductive part 322 and the static contact part 323, and the conductive part 322 of the conductive plate 32 is fixedly connected to the yoke 33, effectively reducing the number of parts of the tripping mechanism 30, and having the characteristics of compact structure and convenient assembly.

[0109] As Figures 1 to 3 shown, in some embodiments, the static contact part 323 is provided with a static contact 3231 and an arcing horn 3232.

[0110] The static contact 3231 is connected to the moving contact 23.

[0111] The arcing horn 3232 is located at the end of the static contact part 323 far from the conductive part 322, and the arcing horn 3232 is integrally provided with the static contact part 323.

[0112] Among them, the static contact part 323 and the conductive part 322 are arranged at an angle, that is, the static contact part 323 is bent relative to the conductive part 322 to different directions so as to cooperate with the moving contact 23 in the circuit breaker. And the arcing horn 3232 is bent and extended in the direction towards the conductive part 322, and the arcing horn 3232 is spaced from the conductive part 322.

[0113] It should be noted that the tripping mechanism 30 is arranged in the housing 10 of the circuit breaker. Usually, an arc extinguishing grid is also arranged in the circuit breaker (not shown in the figure). After the tripping mechanism 30 is assembled into the housing 10, the side surface of the yoke 33 facing away from the conductive part 322 is close to the arc extinguishing grid, and can play a role in arc ignition and arc extinguishing together with the arc extinguishing grid.

[0114] By bending and extending the arcing angle 3232 towards the direction where the conductive part 322 is located, the electric arc can be guided to the positions of the yoke 33 and the arc extinguishing grid plates, facilitating the rapid transfer of the electric arc from the arcing angle 3232 to between the yoke 33 and the arc extinguishing grid plates, and preventing the electric arc from damaging other components.

[0115] Specifically, as Figure 2 shown, the bending direction of the static contact part 323 relative to the conductive part 322 is opposite to the orientation of the yoke 33, that is, the static contact part 323 bends towards the direction away from the conductive part 322. The arcing angle 3232 is provided at the end of the static contact part 323 away from the conductive part 322, and the arcing angle 3232 bends towards the direction close to the conductive part 322. In this way, the formed static contact part 323 not only satisfies the conductive function but also can realize the arcing function, with relatively high practicability.

[0116] In the embodiment of the present application, by integrally arranging the arcing angle 3232 on the static contact part 323, the electric arc generated on the static contact part 323 can move more smoothly along the arcing angle 3232 to the end of the arcing angle 3232. Compared with the traditional way of separately arranging the static contact part 323 and the arcing angle 3232, this embodiment can reduce the action of the electric arc jumping from the static contact part 323 to the arcing angle 3232. And by integrally arranging the arcing angle 3232 and the static contact part 323, the structure of the conductive plate 32 can be effectively simplified, and then the structure of the tripping mechanism 30 can be simplified, making the assembly operation of the tripping mechanism 30 more convenient.

[0117] Figure 4 It is a schematic diagram of the connection structure of a yoke and a second limiting part provided by the embodiment of the present application. As Figure 4 shown, in some embodiments, the yoke 33 includes a bottom plate 331, and a first magnetic conductive plate 332 and a second magnetic conductive plate 333 symmetrically arranged on the bottom plate 331.

[0118] The conductive plate 32 is fixedly connected to the bottom plate 331.

[0119] The armature 31 is rotatably connected between the first magnetic conductive plate 332 and the second magnetic conductive plate 333, and the armature 31 is located at the open position or the clapping position.

[0120] Among them, when the circuit where the circuit breaker is located is normal, the armature 31 is located at the open position; when the circuit where the circuit breaker is located fails, the armature 31 moves from the open position to the clapping position, and changes the positions of the lock 21 and the moving contact 23 through the third protrusion 311, the first protrusion 211, and the second protrusion 221 to achieve the tripping of the circuit breaker.

[0121] Among them, the first magnetic conductive plate 332 and the second magnetic conductive plate 333 are symmetrically arranged on both sides of the bottom plate 331 along the second direction OY, and the first magnetic conductive plate 332 and the second magnetic conductive plate 333 are oppositely arranged and have the same extension direction.

[0122] It should be noted that the sizes of the first magnetic conductive plate 332 and the second magnetic conductive plate 333 may be the same or different, and this embodiment does not make specific limitations thereon.

[0123] It should be noted that the bottom plate 331, the first magnetic conductive plate 332 and the second magnetic conductive plate 333 jointly enclose an assembly groove, and the conductive part 322 of the conductive plate 32 is installed in the assembly groove. When there is current passing through the conductive plate 32, the current flows through the conductive part 322 and forms a magnetic field between the first magnetic conductive plate 332 and the second magnetic conductive plate 333, so that the magnetic yoke 33 can provide electromagnetic force to drive the release iron 311 to act, realizing the tripping function of the tripping mechanism 30.

[0124] Wherein, the armature 31 is rotatably connected to the first magnetic conductive plate 332 and the second magnetic conductive plate 333. The opening position of the armature 31 relative to the magnetic yoke 33 refers to the position where the armature 31 rotates away from the bottom plate 331; on the contrary, the closing position of the armature 31 relative to the magnetic yoke 33 refers to the position where the armature 31 rotates close to the bottom plate 331.

[0125] One end of the elastic member 34 is connected to the position of the armature 31 far from the rotational connection with the magnetic yoke 33, and the other end of the elastic member 34 is connected to the position of the magnetic yoke 33 close to the rotational connection. In this way, the armature 31 can be maintained in the opening position by the pulling force of the elastic member 34, ensuring that the armature 31 is always in the opening position in the open state of the circuit breaker.

[0126] It should be noted that when the circuit breaker is in the open state, there is no current passing through the conductive plate 32, and the armature 31 is in the opening position relative to the magnetic yoke 33. When the circuit breaker is in the closed state, a normal current passes through the conductive plate 32, and the electromagnetic force generated on the magnetic yoke 33 is less than the pulling force of the elastic member 34. At this time, the magnetic yoke 33 cannot adsorb the armature 31 to make the armature 31 rotate, and the armature 31 is still in the opening position relative to the magnetic yoke 33; when the current passing through the conductive plate 32 suddenly increases and reaches the current preset value, the electromagnetic force generated by the magnetic yoke 33 is greater than the pulling force of the elastic member 34, and the magnetic yoke 33 adsorbs the armature 31 to make the armature 31 rotate clockwise from the opening position to the closing position, thereby realizing the function of the tripping mechanism 30 and making the circuit breaker 200 trip.

[0127] The current preset value is the rated current of the circuit breaker. When a fault occurs in the circuit where the circuit breaker is located, the sudden change of the current makes the magnetic field force generated on the magnetic yoke 33 become larger, and then the armature 31 is adsorbed to the closing position to realize the tripping and disconnection of the circuit breaker.

[0128] In the embodiment of the present application, the armature 31 is rotatably connected between the first magnetic conductive plate 332 and the second magnetic conductive plate 333 of the yoke 33. The magnetic field generated on the yoke 33 can directly act on the armature 31. The elastic member 34 is connected between the armature 31 and the yoke 33 and can also directly act on the armature 31 to generate a force opposite to that of the yoke 33. The tripping mechanism 30 with this setting form has the characteristics of simple structure and stable cooperation.

[0129] Figure 5 Schematic structural diagram of an armature provided by an embodiment of the present application; Figure 6 Schematic connection structural diagram of an armature, a yoke and an elastic member provided by an embodiment of the present application. As Figure 5 and Figure 6 shown, in some embodiments, the armature 31 has a mounting plate 312, and a first ear plate 313 and a second ear plate 314 are symmetrically arranged on the mounting plate 312.

[0130] First mounting holes 315 for the rotation shaft 334 to pass through are formed on both the first ear plate 313 and the second ear plate 314.

[0131] Second mounting holes 335 for the rotation shaft 334 to pass through are formed on both the first magnetic conductive plate 332 and the second magnetic conductive plate 333.

[0132] The armature 31 is rotatably connected to the first magnetic conductive plate 332 and the second magnetic conductive plate 333 through the rotation shaft 334.

[0133] Among them, second mounting holes 335 are provided on both the first magnetic conductive plate 332 and the second magnetic conductive plate 333. On the mounting plate 312 of the armature 31, a first ear plate 313 and a second ear plate 314 are symmetrically arranged along the second direction OY, and first mounting holes 315 are provided on both the first ear plate 313 and the second ear plate 314. The first mounting holes 315 and the second mounting holes 335 are located in relative positions.

[0134] It should be noted that the first ear plate 313 and the second ear plate 314 are located between the first magnetic conductive plate 332 and the second magnetic conductive plate 333. The rotation shaft 334 sequentially passes through the second mounting hole 335 on the first magnetic conductive plate 332, the first mounting hole 315 on the first ear plate 313, the first mounting hole 315 on the second ear plate 314, and the second mounting hole 335 on the second magnetic conductive plate 333.

[0135] In the first embodiment, the hole walls of the second mounting holes 335 on the first magnetic conductive plate 332 and the second magnetic conductive plate 333 are fixedly connected to the side surface of the rotation shaft 334, and the first mounting holes 315 on the first ear plate 313 and the second ear plate 314 are rotatably matched with the rotation shaft 334 to realize the rotational connection between the armature 31 and the yoke 33.

[0136] In the second embodiment, the second mounting holes 335 on the first magnetic conductive plate 332 and the second magnetic conductive plate 333 are all in rotational cooperation with the rotating shaft 334, and the hole walls of the first mounting holes 315 on the first ear plate 313 and the second ear plate 314 are fixedly connected to the side surface of the rotating shaft 334, so as to realize the rotational connection between the armature 31 and the yoke 33.

[0137] The rotational connection between the armature 31 and the yoke 33 can be realized in the above two embodiments, and this embodiment does not make specific limitations thereto.

[0138] In the embodiment of the present application, the armature 31 is in rotational cooperation with the yoke 33 through the rotating shaft 334, so that the armature 31 can rotate more smoothly between the open position and the clapping position, reducing the direct influence of the current passing through the conductive plate 32 on the armature 31. In addition, it can also reduce the influence of sundries such as dust or debris generated by rotational wear on the normal rotation of the armature 31, improve the reliability of the rotation of the armature 31 relative to the yoke 33, and ensure that the armature 31 can rotate from the open position to the clapping position in time.

[0139] As Figure 1 shown, in some embodiments, the limiting member 40 includes a first limiting portion 41 provided on the housing 10.

[0140] When the armature 31 is in the open position, the top surface of the third protruding portion 311 of the armature 31 abuts against the bottom surface of the first limiting portion 41.

[0141] As Figure 2 shown, the first limiting portion 41 is an inclined plate provided on the housing 10. The inclined plate cooperates with the third protruding portion 311 of the armature 31. When the armature 31 is in the open position, the top surface of the third protruding portion 311 facing the first limiting portion 41 abuts against the bottom surface of the first limiting portion 41, so as to facilitate the first limiting portion 41 to limit the open position of the armature 31.

[0142] In the embodiment of the present application, by providing the first limiting portion 41 on the housing 10 to limit the third protruding portion 311, and further limit the rotation range of the armature 31, it is avoided that the yoke 33 cannot adsorb the armature 31 when a fault occurs in the circuit where the circuit breaker is located due to the too large distance between the armature 31 and the yoke 33, ensuring the reliability of the use of the circuit breaker.

[0143] As Figures 2 to 4 shown, in some embodiments, a first mounting post 336 is provided on the second magnetic conductive plate 333.

[0144] The limiting member 40 includes a second limiting portion 42 provided on the first mounting post 336.

[0145] When the armature 31 is in the open position, the top surface of the armature 31 abuts against the bottom surface of the second limiting portion 42.

[0146] Among them, the first mounting post 336 is a column extending from the top surface of the second magnetic conductive plate 333, and the first mounting post 336 is arranged close to the rotation matching part of the armature 31 and the yoke 33.

[0147] It should be noted that the second limiting part 42 is a convex part arranged on the first mounting post 336. When the armature 31 is in the open position, the top surface of the armature 31 abuts against the bottom surface of the second limiting part 42, so as to limit the open position of the armature 31 by the second limiting part 42.

[0148] It should be noted that the second limiting part 42, the first mounting post 336 and the second magnetic conductive plate 333 are integrally formed, effectively reducing the number of parts of the tripping mechanism 30, having a compact structure and being convenient for assembly.

[0149] In the embodiment of the present application, by arranging the second limiting part 42 on the second magnetic conductive plate 333, the rotation range of the armature 31 is limited, avoiding that the yoke 33 cannot adsorb the armature 31 when a fault occurs in the circuit where the circuit breaker is located due to the too large distance between the armature 31 and the yoke 33, and ensuring the use reliability of the circuit breaker.

[0150] As Figure 6 shown, in some embodiments, the elastic member 34 is a tension spring; a second mounting post 316 is arranged on the armature 31; one end of the tension spring is connected to the first mounting post 336, and the other end of the tension spring is connected to the second mounting post 316.

[0151] Among them, the second mounting post 316 is a column arranged at the end of the armature 31 far from the yoke 33.

[0152] It should be noted that the elastic member 34 is a tension spring, the first end of the tension spring is connected to the first mounting post 336, and the second end of the tension spring is connected to the second mounting post 316, thereby applying a pulling force to the armature 31 to make the armature 31 have a tendency to rotate in a direction away from the yoke 33.

[0153] Referring to Figure 6 , a first hanging groove 3361 is arranged on the first mounting post 336, and the first end of the tension spring can be hung or sleeved in the first hanging groove 3361, which can play a role in fixing the first end of the tension spring while bearing the pulling force of the tension spring, preventing the tension spring from loosening or falling off, and improving the connection stability of the tension spring. A second hanging groove 3161 is arranged on the second mounting post 316. The second mounting post 316 can bear the pulling force of the tension spring, and the second hanging groove 3161 is used to fix the second end of the tension spring, having the same technical effect as the foregoing first mounting post 336, and will not be elaborated here.

[0154] In the embodiment of the present application, a tension spring is provided to apply a pulling force to the side of the armature 31 away from the yoke 33, so that the armature 31 can be held in the open position when the circuit breaker is in the closed state. When the magnetic field force applied by the yoke 33 to the armature 31 is greater than the pulling force of the tension spring, the armature 31 rotates to the clapper position. This can ensure the normal operation of the tripping mechanism 30 and prevent the armature 31 from shaking or rotating randomly, which may cause the armature 31 to rotate to the clapper position in advance, thereby improving the working accuracy of the tripping mechanism 30.

[0155] In some embodiments, the elastic member 34 is a torsion spring; the torsion spring is sleeved on the rotating shaft 334, one end of the torsion spring abuts against the mounting plate 312, and the other end of the torsion spring abuts against the bottom plate 331.

[0156] It should be noted that the elastic member 34 can be set as a torsion spring. The torsion spring can be sleeved on the rotating shaft 334 (not shown in the figure). The torsion spring usually has a first torsion arm and a second torsion arm. The first torsion arm of the torsion spring abuts against the mounting plate 312 of the armature 31, and the second torsion arm of the torsion spring abuts against the bottom plate 331 of the yoke 33. In this way, an elastic force can also be applied to the armature 31 to prevent the armature 31 from rotating randomly, which has the same effect as the tension spring in the foregoing embodiment, and this embodiment will not be elaborated herein.

[0157] In the embodiment of the present application, by setting the torsion spring, the armature 31 can be held in the open position when the circuit breaker is in the closed state. When the magnetic field force applied by the yoke 33 to the armature 31 is greater than the pulling force of the tension spring, the armature 31 rotates to the clapper position, which can ensure the normal operation of the tripping mechanism 30 and prevent the armature 31 from shaking or rotating randomly, which may cause the armature 31 to rotate to the clapper position in advance, thereby improving the working accuracy of the tripping mechanism 30.

[0158] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A circuit breaker, characterized in that, Comprising: An operating mechanism, including a latch, a contact support, and a moving contact. The latch has a first protrusion, the contact support is connected to the moving contact, and the contact support has a second protrusion; A tripping mechanism, including an armature. The armature has a third protrusion, and the third protrusion is located above the first protrusion. The third protrusion is used to change the positions of the latch and the moving contact through the first protrusion and the second protrusion when a fault occurs in the circuit where the circuit breaker is located, so as to achieve tripping of the circuit breaker; A limiting member, connected to the tripping mechanism and / or the housing of the circuit breaker. The limiting member is used to limit the armature.

2. The circuit breaker according to claim 1, characterized in that, The tripping mechanism further includes a conductive plate, a magnetic yoke, and an elastic member; The armature is rotatably connected to the magnetic yoke, and the conductive plate is fixedly connected to the magnetic yoke; Both the armature and the magnetic yoke are connected to the elastic member.

3. A circuit breaker according to claim 2, characterized in that, The conductive plate includes a wiring portion, a conductive portion, and a static contact portion; The wiring portion is used to cooperate with the wiring frame of the circuit breaker to form a wiring terminal; The conductive portion is used to connect the wiring portion and the static contact portion, and the conductive portion is fixedly connected to the magnetic yoke; The static contact portion is used to connect to the moving contact.

4. A circuit breaker according to claim 3, characterized in that, A static contact and an arcing horn are provided on the static contact portion; The static contact is connected to the moving contact; The arcing horn is located at the end of the static contact portion away from the conductive portion, and the arcing horn is integrally provided with the static contact portion.

5. A circuit breaker according to claim 2, characterized in that, The magnetic yoke includes a bottom plate, and a first magnetic conductive plate and a second magnetic conductive plate symmetrically arranged on the bottom plate; The conductive plate is fixedly connected to the bottom plate; The armature is rotatably connected between the first magnetic conductive plate and the second magnetic conductive plate, and the armature is located at an open position or a clapping position; Wherein, when the circuit where the circuit breaker is located is normal, the armature is located at the open position; when a fault occurs in the circuit where the circuit breaker is located, the armature moves from the open position to the clapping position, and changes the positions of the latch and the moving contact through the third protrusion, the first protrusion, and the second protrusion, so as to achieve tripping of the circuit breaker.

6. The circuit breaker according to claim 5, characterized in that, The armature has a mounting plate, and a first ear plate and a second ear plate are symmetrically arranged on the mounting plate; First mounting holes for the rotation shaft to pass through are provided on both the first ear plate and the second ear plate; Second mounting holes for the rotation shaft to pass through are provided on both the first magnetic conductive plate and the second magnetic conductive plate; The armature is rotatably connected to the first magnetic conductive plate and the second magnetic conductive plate through the rotation shaft.

7. A circuit breaker according to claim 5, characterized in that, The limiting member includes a first limiting portion provided on the housing; When the armature is located at the open position, the top surface of the third protrusion of the armature abuts against the bottom surface of the first limiting portion.

8. A circuit breaker according to claim 5, characterized in that, A first mounting post is provided on the second magnetic conductive plate; The limiting member includes a second limiting portion provided on the first mounting post; When the armature is located at the open position, the top surface of the armature abuts against the bottom surface of the second limiting portion.

9. A circuit breaker according to claim 8, wherein, The elastic member is a tension spring; A second mounting post is provided on the armature; One end of the tension spring is connected to the first mounting post, and the other end of the tension spring is connected to the second mounting post.

10. A circuit breaker according to claim 6, characterized in that, The elastic member is a torsion spring; The torsion spring is sleeved on the rotating shaft. One end of the torsion spring abuts against the mounting plate, and the other end of the torsion spring abuts against the bottom plate.

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