Lightning protection operating mechanism and circuit breaker

Abstract

The utility model discloses a lightning protection operating mechanism and a circuit breaker. The lightning protection operating mechanism comprises a lock catch, a jump pin, a moving contact and a contact supporting piece. The jump pin and the moving contact are rotatably installed at the two ends of the contact supporting piece respectively. The lock catch is hinged with the contact supporting piece, and the tail part of the lock catch is hasped with the jump pin; the tail part of the moving contact is provided with a protruding part. A convex rib is arranged at the head of the lock catch; when lightning strike electricity makes the moving contact repulsion open, the protruding part and the convex rib contact and cooperate to limit the rotation angle of the lock catch, so that the lock catch and the jump pin are kept in a locked state. The circuit breaker comprises a shell and a static contact fixed in the shell, wherein the shell is also provided with the lightning protection operating mechanism; the head part of the moving contact is in separated contact with the static contact; the hinged shaft is installed on the shell, and the lightning protection operating mechanism can rotate in the shell around the hinged shaft. The lightning protection device is reasonable in structure and convenient to operate, and can effectively prevent the switch from tripping mistakenly after lightning stroke, thereby avoiding the problem that 5G signal interruption brings inconvenience to life and social operation of people.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low voltage electrical equipment technical field, concretely relates to a lightning protection operating mechanism and circuit breaker. BACKGROUND

[0002] The communication cabinet is usually built in the open ground, the roof, the mountainous area and the position vulnerable to lightning, and the communication cabinet contains a large number of metal components, such as shell, support, cable and the like, which increases the risk of lightning strike. When the communication cabinet is struck by lightning, when lightning occurs, the circuit breaker in the communication cabinet is struck by lightning, and the loop generates about 15KA-40KA large current instantaneously, and the time is not more than 1ms, at this time, the electric repulsion between the moving contact and the static contact is far greater than the contact terminal voltage, the contact is repelled, the moving contact is impacted and vibrated by the large electric repulsion, the moving contact is transmitted to the whole operating mechanism through the contact support, the lock catch and the trip catch are tripped, and switch misoperation occurs.

[0003] If the communication cabinet is damaged by lightning or causes switch misoperation under lightning, it will cause the interruption of 5G signal in the local area, and bring inconvenience to people's life and social operation. Therefore, the circuit breaker applied to the communication cabinet has high requirements for lightning protection performance. The existing lightning protection of the small circuit breaker for communication is to reduce the electric repulsion and the hom force between the contacts of the circuit breaker, so that the contacts are not easy to repel, but the structure of the circuit breaker is relatively complex, the electric repulsion between the contacts of the circuit breaker cannot be completely avoided, and switch misoperation still occurs, and the effect of preventing switch misoperation is not ideal. Therefore, it is necessary to develop a circuit breaker that does not trip after lightning. CONTENT OF UTILITY MODEL

[0004] To solve the above problems, the purpose of the utility model is to provide a lightning protection operating mechanism and circuit breaker which can not trip after lightning and effectively avoid switch misoperation.

[0005] The purpose of the utility model is realized by the following technical scheme:

[0006] A lightning protection operating mechanism, comprising a lock catch, a trip catch, a moving contact and a contact support, the trip catch and the moving contact are rotatably installed at both ends of the contact support, the lock catch and the contact support are hingedly connected through a hinge shaft, the head of the lock catch extends towards the moving contact, and the tail of the lock catch is buckled with the trip catch. The tail of the moving contact is provided with a protruding part extending towards the head of the lock catch, the inside of the head of the lock catch is provided with a convex rib corresponding to and matched with the protruding part, when the moving contact is repelled by the electric repulsion caused by lightning current, the protruding part contacts and cooperates with the convex rib to limit the clockwise rotation angle of the lock catch, so that the lock catch and the trip catch remain in the locked state, and the circuit breaker is prevented from mis-tripping. In the closed state, there is a gap between the protruding part and the convex rib, and the head of the lock catch can rotate clockwise in the gap until the tail of the lock catch is tripped with the trip catch.

[0007] The utility model also provides a lightning -resistant circuit breaker, including casing and fixed in casing's static contact, still install above -mentioned lightning -resistant operating mechanism in casing, the head of static contact is separated with the dynamic contact of head formula contact, hinge shaft is installed on the casing, the lightning -resistant operating mechanism can rotate in the casing around hinge shaft.

[0008] The utility model discloses reasonable structure, convenient operation can be after lightning, not tripping, effectively prevent switch misjump, thereby avoid the problem of 5G signal interruption, bring inconvenience to people's life and social operation. BRIEF DESCRIPTION OF DRAWINGS

[0009] The structure of the utility model will be further explained in detail below in combination with the drawings.

[0010] Figure 1 It is the structure schematic drawing of lightning -resistant circuit breaker in the opening state of the utility model.

[0011] Figure 2 It is the structure schematic drawing of lightning -resistant circuit breaker in the closing state of the utility model.

[0012] Figure 3 It is the structure schematic drawing of lightning -resistant circuit breaker when repelling dynamic contact under lightning in the closing state.

[0013] Figure 4 It is the structure schematic drawing of lightning -resistant operating mechanism in the closing state of the utility model.

[0014] Figure 5 It is the structure schematic drawing of lightning -resistant operating mechanism when repelling dynamic contact under lightning in the closing state.

[0015] Figure 6 It is the structure schematic drawing of the lock catch of the utility model.

[0016] Figure 7 It is the structure schematic drawing of dynamic contact of the utility model.

[0017] Figure 8 It is the structure schematic drawing of contact support of the utility model.

[0018] As shown in the figure: 1-lock catch, 11-convex rib, 12-gap, 2-jump catch, 3-casing, 4-first pivot, 5-second pivot, 6-static contact, 7-dynamic contact, 71-protruding part, 8-contact support, 9-hinge shaft, 10-torsion spring, 13-main tension spring. DETAILED DESCRIPTION

[0019] The advantages and effects of the present application can be easily understood by those skilled in the art based on the content disclosed in the specification. The described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0020] It should be understood that the structures, proportions, sizes and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limiting conditions of the embodiments of the present application, so they do not have technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and the like in the specification are only for clear description, and are not used to limit the scope of the embodiments of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the embodiments of the present application.

[0021] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. It should be noted that the terms "include", "contain" or any other variant are intended to cover non-exclusive inclusion, so that the process, method, article or equipment containing a series of elements not only includes those elements, but also includes other elements not explicitly listed, or includes elements inherent to such process, method, article or equipment. Embodiment 1

[0022] As Figures 1-3 shown, the present embodiment provides a lightning protection circuit breaker, which comprises a shell 3, a static contact 6, a main tension spring 13 and a lightning protection operating mechanism.

[0023] The shell 3 is a circuit breaker mounting base.

[0024] The static contact 6 is fixed in the shell 3.

[0025] As Figures 4-8As shown, the lightning-proof operating mechanism is installed in the housing 3, which comprises the lock catch 1, the trip catch 2, the movable contact 7, the contact support 8 and the torsion spring 10.

[0026] The tail of the contact support 8 is provided with the first pin shaft 4, the head of the contact support 8 is provided with the second pin shaft 5, and the hinge shaft 9 is installed between the head and the tail of the contact support 8, penetrates the contact support 8 and is installed on the housing 3, is arranged close to the tail of the contact support 8, and enables the contact support 8 (the lightning-proof operating mechanism) to rotate in the housing 3 around the hinge shaft 9, and the first pin shaft 4, the second pin shaft 5 and the hinge shaft 9 are parallel to each other.

[0027] The trip catch 2 is rotatably installed on the tail of the contact support 8 through the first pin shaft 4.

[0028] The movable contact 7 is rotatably installed on the head of the contact support 8 through the second pin shaft 5, can rotate in the head of the contact support 8 around the second pin shaft 5, the head of the movable contact 7 is separated from the fixed contact 6, and the tail of the movable contact 7 is provided with a protruding part 71 extending towards the head of the lock catch 1. The protruding part 71 can be extended out of the contact support 8 by rotating (with the clockwise rotation of the movable contact 7) and forms mechanical interference with the convex rib 11 inside the head of the lock catch 1.

[0029] The lock catch 1 is hingedly connected with the contact support 8 through the hinge shaft 9, the head of the lock catch 1 extends towards the movable contact 7, and the tail of the lock catch 1 is interlocked with the trip catch 2. The inside of the head of the lock catch 1 is provided with the convex rib 11 corresponding to and matched with the protruding part 71, there is a gap 12 between the protruding part 71 and the convex rib 11 in the closed state, and the tail of the lock catch 1 can rotate clockwise in the gap 12 until the head of the lock catch 1 is tripped from the trip catch 2.

[0030] When the lightning current causes the movable contact 7 to be repelled by the electric force, the protruding part 71 contacts and cooperates with the convex rib 11 to limit the clockwise rotation angle of the lock catch 1, so that the lock catch 1 and the trip catch 2 remain in the locked state, thereby avoiding the false tripping of the circuit breaker.

[0031] The torsion spring 10 is sleeved on the hinge shaft 9 and has two torsion arms, one end (one of the torsion arms) of which is fixed to the head of the lock catch 1, and the other end (the other torsion arm) of which is fixed to the tail of the contact support 8, so that the lock catch 1 and the trip catch 2 are kept in stable interlocking, when the lock catch 1 is rotated clockwise under the action of external force to trip the lock catch 1 from the trip catch 2 (the torsion spring 10 stores energy), the torsion spring 10 (the torsion spring 10 releases energy) pushes the lock catch 1 to rotate counterclockwise to reset and interlock with the trip catch 2 after the operating mechanism rotates to open the circuit breaker.

[0032] One end of the main tension spring 13 is connected to the housing 3, and the other end is connected to the tail of the movable contact 7 at a connecting part between the second pin shaft 5 and the protruding part 71.

[0033] Working principle:

[0034] When the circuit breaker is working normally, such as Figure 2 and Figure 4 As shown, there is a gap 12 between the latch 1 and the moving contact 7. The latch 1 can rotate clockwise until the latch 1 and the trip latch 2 are unlocked, and the circuit breaker can trip to achieve overload or short circuit protection functions.

[0035] If there is a momentary lightning current in the circuit, which is typically 15kA-40kA, the moving contact 7 will be instantly repelled (away from the stationary contact 6) due to electrodynamic force. Figure 3 and Figure 5 When the moving contact 7 rotates clockwise by a certain angle under the action of electrodynamic force, the protruding part 71 at the tail of the moving contact 7 rotates clockwise by a certain angle within the gap 12 and then contacts the protruding rib 11 to form mechanical interference, which prevents the latch 1 from rotating clockwise. The latch 1 and the trip latch 2 cannot be disengaged, and the circuit breaker cannot trip. Example 2

[0036] The difference between this embodiment and Embodiment 1 is that the outline of the protrusion 71 is composed of at least three continuous tangent arcs. Example 3

[0037] The difference between this embodiment and embodiment 1 or 2 is that the contact support 8 has a U-shaped structure with a square groove 81 at its bottom; the moving contact 7 is rotatably mounted in the U-shaped groove of the contact support 8 via the second rotating shaft 5, and the protrusion 71 of the moving contact 7 can extend out of the square groove 81 by rotation and form mechanical interference with the protruding rib 11 of the latch 1.

[0038] Other aspects of this utility model that are not detailed herein are all conventional techniques known to those skilled in the art.

[0039] It should be noted that the terms “comprising,” “including,” or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0040] The scope of protection of this utility model is not limited to the technical solutions disclosed in the specific embodiments. Any modifications, equivalent substitutions, improvements, etc., made to the above embodiments based on the technical essence of this utility model shall fall within the scope of protection of this utility model.

Claims

1. A lightning protection operating mechanism, comprising a latch (1), a trip latch (2), a moving contact (7), and a contact support (8); The jumper (2) and the moving contact (7) are respectively rotatably mounted at both ends of the contact support (8); The latch (1) and the contact support (8) are hinged by a hinge shaft (9), with its head extending toward the moving contact (7) and its tail interlocking with the jumper (2); Its features are: The tail of the moving contact (7) is provided with a protrusion (71) extending toward the head of the latch (1). The inner side of the head of the latch (1) is provided with a rib (11) that matches the protrusion (71). When the lightning strike current causes the moving contact (7) to be repelled by the electric force, the protrusion (71) contacts the rib (11) and cooperates to limit the clockwise rotation angle of the latch (1), so that the latch (1) and the trip latch (2) remain locked, and the circuit breaker is prevented from tripping accidentally.

2. The lightning protection operating mechanism according to claim 1, characterized in that: The outline of the protrusion (71) is composed of multiple continuous tangent arcs.

3. The lightning protection operating mechanism according to claim 1, characterized in that: In the closed state, there is a gap (12) between the protrusion (71) and the rib (11); the head of the latch (1) can rotate clockwise within the gap (12) until its tail disengages from the jumper (2).

4. The lightning protection operating mechanism according to claim 1, characterized in that: The contact support (8) has a U-shaped structure with a square groove (81) at its bottom. The moving contact (7) is rotatably installed in the U-shaped groove of the contact support (8), and the protrusion (71) of the moving contact (7) can extend out of the square groove (81) by rotation and form mechanical interference with the protruding rib (11) of the latch (1).

5. The lightning protection operating mechanism according to claim 1, characterized in that: It also includes a torsion spring (10), which is sleeved on the hinge shaft (9), with one end fixed to the head of the latch (1) and the other end fixed to the tail of the contact support (8), so that the latch (1) and the snap fastener (2) remain stably fastened.

6. The lightning protection operating mechanism according to claim 1, characterized in that: The jumper (2) is rotatably mounted on the tail of the contact support (8) via the first pin (4); the moving contact (7) is rotatably mounted on the head of the contact support (8) via the second pin (5).

7. A lightning protection circuit breaker, comprising a housing (3) and a stationary contact (6) fixed within the housing (3), characterized in that: The housing (3) is also equipped with a lightning protection operating mechanism as described in any one of claims 1-6; the head of the moving contact (7) is in separate contact with the stationary contact (6); the hinge shaft (9) is mounted on the housing (3), and the lightning protection operating mechanism can rotate around the hinge shaft (9) inside the housing (3).

8. The lightning protection circuit breaker according to claim 7, characterized in that: It also includes a main tension spring (13), one end of which is connected to the housing (3) and the other end is connected to the tail of the moving contact (7).

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