CN212113603U - Tripping mechanism and miniature circuit breaker adopting same - Google Patents

Abstract

The utility model belongs to the field of low-voltage electrical equipment, and discloses a tripping mechanism, which comprises a contact support and a swing fork arranged on the contact support, wherein the swing fork is of a lever structure with a fulcrum, and a circuit is switched on/off by moving the contact support; when the switch is switched on, the set first power source acts and is in transmission connection with the contact support under the limitation of the swing fork, so that the contact support acts to reach a switch-on state and is kept in the switch-on state; when the brake is broken, the second power source pushes one end of the swing fork far away from the fulcrum to act, so that the first power source and the contact support lose the limiting effect, and the contact support with restoring force returns to the initial position and keeps the brake breaking state before the first power source acts. The miniature circuit breaker comprises a shell with a wiring terminal, and the tripping mechanism is arranged in the shell. The utility model discloses simple structure, space occupancy is lower, is fit for setting up in the limited miniature circuit breaker of volume.

Description

Tripping mechanism and miniature circuit breaker adopting same

Technical Field

The utility model belongs to the technical field of low pressure electrical protection equipment, concretely relates to tripping device and miniature circuit breaker.

Background

The tripping mechanism is an important component for promoting the automatic tripping of the switch in an operating system, the tripping mechanism acts as a force fulcrum during the closing process and at the closing position of the circuit breaker, and when the circuit breaker automatically trips, the tripping mechanism is controlled by the tripping device to release the fulcrum, so that the circuit breaker enters a free opening state. Generally speaking, a lever and a spring mechanism in a switch are supported by a release, and once the release acts, the lever and the spring mechanism in the switch can be reset freely, namely the switch trips. The release is equivalent to a pin for hanging bait in the mousetrap.

The existing tripping mechanism consists of a set of four-bar component with force reducing function and a fulcrum capable of releasing force, and tripping and a switch are matched to be used as protection of overload and short circuit of a low-voltage distribution line, a device and a motor. Common releases include over-current releases, under-voltage releases, and the like. The tripping mechanism is required to be stable and reliable in operation, namely, the functions of establishing a fulcrum and releasing the fulcrum are stable in the switching-on and switching-off processes, the tripping mechanism is clear in action when operated by the tripping device, and the tripping mechanism cannot be tripped under the influence of vibration and external force when located at the switching-on position. The failure of the tripping mechanism can prevent the opening signal from generating opening action on the circuit breaker, prevent the circuit breaker from executing the opening task, or generate error opening when the opening signal is not received. These all cause serious mischief in the power system. Secondly, the trip mechanism should have sufficient mechanical strength and rigidity, low tripping force and power (force and power necessary for tripping), and short tripping time (time interval from the tripping action of the tripped device to the tripping stop). These requirements result in the tripping mechanism having to have a large force reduction, a small movement stroke and a small moving mass.

The conventional tripping mechanism is easy to be mistakenly broken when being impacted or vibrated from the outside, and meanwhile, as a plurality of parts are adopted to realize switching on/off, the structure is complex, the reliability is low, the occupied space is large, and the conventional circuit breaker occupies a large volume. The torque amplification effect of the existing tripping mechanism is poor, so that the electromagnetic assembly matched with the existing circuit breaker needs to adopt a larger winding group structure to meet the breaking requirement. If the aim of reducing the volume of the miniature circuit breaker is to be achieved, the existing tripping assembly is difficult to be directly adapted.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem that the great structure of above-mentioned current tripping device volume is comparatively complicated to exist, the utility model provides a few components realize the tripping device of stable dropout effect and the miniature circuit breaker who constitutes by this mechanism.

The utility model discloses the technical scheme who adopts does:

a tripping mechanism is used for automatically breaking a brake or manually controlling the break of the brake in a corresponding fault of an access circuit in a matching manner of a power source so as to protect the circuit, and comprises a contact support and a swing fork arranged on the contact support, wherein the swing fork is of a lever structure with a fulcrum, and the contact support is moved so that the access circuit is switched on/off;

when the switch is switched on, the set first power source acts and is in transmission connection with the contact support under the limitation of the swing fork, so that the contact support acts to reach a switch-on state and is kept in the switch-on state;

when the brake is broken, the second power source pushes one end of the swing fork far away from the fulcrum to act, so that the first power source and the contact support lose the limiting effect, and the contact support with restoring force returns to the initial position and keeps the brake breaking state before the first power source acts.

First, the utility model discloses well protection tripping device simple structure mainly is two parts: a pendulum fork and a contact support. The contact support is a main structure, carries a contact structure used for communicating with other fixed contacts to conduct, and is arranged in a detachable and integrated mode. The swinging fork is a structure which is arranged on the contact support and used for providing a limiting effect, wherein the swinging fork is a structure with two typical end parts, and a fulcrum is arranged at the position close to one end part, so that the effect of a labor-saving lever is formed.

By having typically two ends, it is meant that the structure is moveable about a fulcrum and is capable of connecting two different structures, with the two structures not having a consistent direction of movement when in motion. It is desirable to have an end structure that connects two structures and the end structure includes multiple embodiments.

Since the contact holder is linked with the first power source, the linkage means that the contact holder is defined by a cooperative relationship including direct connection, indirect connection, or reception of a synchronization signal, and when the first power source operates, the contact holder also operates in synchronization, but the movement direction and the displacement amount are not necessarily the same.

The tripping mechanism mainly realizes the effect of switching on/off, and the structure and the connection relation are limited from two action modes. The first power source is mainly used for realizing switching on/off by controlling the contact support, but is mainly used for the switching on process. And first power supply not only will provide initial power during combined floodgate, and when the contact support removed to form combined floodgate state, first power supply can also last to provide power signal for the contact support can keep combined floodgate state.

And the second power source is only matched with the swing fork, and the swing fork has the effect of limiting the linkage relation formed by the first power source and the contact support and has the function of movable unlocking, so that the swing fork is directly controlled by the second power source to act at a specific moment and lose the limiting capacity, and the contact support loses the power signal continuously provided by the first power source. The contact support originally has restoring force, and moves towards the breaking direction to restore the initial state after losing power, and at the moment, the first power source is activated again to perform closing action, but if the second power source does not eliminate a power signal, the swing fork still cannot provide a limiting effect, and even if the first power source acts, the contact support cannot act.

It is worth explaining, the utility model provides a tripping device is the action part that is arranged in other equipment that have circuit protection effect such as circuit breaker, mainly realizes the on-off control to inserting the circuit. The switch-on/switch-off effect is achieved by connecting a conductor through a main component and actuating the conductor connected with one end of an access circuit. But this construction is intended to simplify the construction and number of parts of the mechanical assembly according to the prior art, so that a better stability is achieved.

Furthermore, the swing fork is of a rotary rod-shaped structure, and one end of the swing fork is a limiting end which limits the transmission connection between the first power source and the contact support;

the other end of the driving shaft is a pushing end matched with a second power source;

the fulcrum is arranged on one side close to the limiting end.

The pendulum fork needs to provide the restriction effect and the moment amplification effect simultaneously, and needs to have better reliability, then sets up at rectangular shaft-like structure to set up the fulcrum in the position department that is close to spacing end one side as far as possible, thereby can satisfy above-mentioned requirement and correspondingly reach better effect. Because the fulcrum sets up and is being close to spacing end one side, then when whole pendulum fork rotated around the fulcrum, the tip of spacing end rotated the displacement volume and is far less than the tip displacement volume of promotion end, then can be with the stroke design of locking threshold locking/unblock that spacing end formed less during the in-service use, satisfy the second power supply and can accomplish the unblock requirement on limited displacement volume.

It is worth to say that, compared with other lever structures, the rod-shaped swing fork rotating around the fixed point is the simplest in structure and the best in reliability, and a more appropriate torque ratio is achieved by adjusting the position of the fulcrum. Other lever structures are all moving components capable of achieving labor saving effect, and include but are not limited to rotating rods, connecting rod assemblies, screw assemblies and gear assemblies.

Furthermore, a limiting structure for limiting the directional movement of the contact end of the first power source and the contact support is arranged on the contact support, and the limiting end of the swing fork is matched with the limiting structure to form a locking threshold.

The locking threshold is a fixed limit structure formed by matching a limit end with a limit structure of the contact support. The limiting structure on the contact support can limit the contact end of the first power source which is in free movement originally within a certain range, and can only do directional movement. However, only limited by the limiting structure, the first power source still can move relative to the contact support, and power signals cannot be directly transmitted.

The limiting effect is increased through the movable swing fork, the limiting end of the swing fork only needs to appear on the track of the directional movement of the contact end of the first power source, the connection end of the swing fork can be fixed through one or more limiting points at different positions, and the swing fork is guaranteed not to be offset relative to the contact support when acting, so that the force transmission effect is achieved.

The one or more limiting points at different positions are adapted according to different directional movement modes, and if the contact end can only do linear reciprocating motion, the fixed limiting effect can be realized only by limiting the contact end at the end part of a motion track through a single point; or the two points are clamped at the two sides of the connecting-out end, and the movement of the connecting-out end towards the two sides is limited.

Furthermore, the limiting structure is a sliding groove arranged on or outside the contact support, and the contact end of the first power source extends into the sliding groove and can reciprocate along the extending direction of the sliding groove; the connection end is abutted against any end part of the sliding chute by the limiting end to realize limiting.

The sliding groove can limit the movement mode of the contact end, only linear reciprocating motion can be carried out along the sliding groove, and the movable swing fork limiting end is arranged at the end part close to one side of the sliding groove, so that the sliding groove can abut against the output end to enable the output end not to continuously slide in the sliding groove when a locking state is formed. And the swing fork is connected with the contact support, so that a power signal of the first power source is transmitted to the locking threshold, and the process of closing the switch is realized by the overall action of a relatively stable structure formed by the swing fork and the contact support.

It is worth to be noted that, since the swing fork is rotatably connected with the contact support, in order to ensure that the power signal of the first power source can be smoothly transmitted, the moving direction of the swing fork in the unlocking and locking processes is perpendicular to the moving direction of the contact end of the first power source. Because the pendulum fork can only carry out directional movement relative to the contact support, and can reach the unblock/locking process when removing, only set up the driving force direction of its first power supply to be perpendicular or near perpendicular state with the initial rotation direction of pendulum fork, just can avoid taking place relative slip between pendulum fork and the contact support to furthest. However, since the angle is a technical detail that can be noticed by those skilled in the art according to the technical effects to be achieved, and the swing deviation of the angle is related to parameters such as the size of the component, the motion damping of the component, and the assembling process in the actual design, the angle can be adjusted according to the actual structure, form, and size, and the angle is not limited.

Furthermore, the limiting end is a protruding structure rotating around a fulcrum, and the protruding structure forms a locking threshold with the width smaller than that of the sliding groove on the sliding groove;

when the second power source pushes the swing fork to rotate around the fulcrum, the locking threshold disappears, and the contact support acts to return to the initial position after losing the continuous pushing force of the first power source.

Furthermore, a limited end of the swing fork is provided with a limited slip part which is rotationally connected with the swing fork, and the limited slip part rotates around a fulcrum to form a protruding structure.

Furthermore, the contact support is provided with a torsion spring which gives a pushing force to the anti-slip part towards the direction forming the locking threshold all the time.

Further, the pendulum fork formula structure as an organic whole, its spacing end is outwards outstanding to form curved protruding structure be equipped with on the contact carrier and give the pendulum fork all the time towards the torsional spring that forms the threshold direction driving force of only locking.

Furthermore, the first power source is a manually/electrically rotated closing wrench, the contact end is a push rod rotatably arranged on the closing wrench, and the end part of the push rod is matched, clamped and limited with the locking threshold;

a first return spring used for providing restoring force towards the brake breaking direction is arranged at the end part of one side, far away from the swing fork, of the push rod;

the second power source is an electromagnetic assembly connected into the access circuit in parallel, and the action end of the electromagnetic assembly is arranged corresponding to the pushing end of the swing fork;

the contact support is a rotating part, the bottom of the contact support is connected with a movable contact, the movable contact is contacted with/separated from a fixed contact through the swinging of the contact support to realize switching on/off, and a second reset spring used for providing restoring force towards the switching off direction is arranged between the rotating point of the contact support and one side close to the push rod.

A miniature circuit breaker comprises a shell with a wiring terminal, and a tripping mechanism is arranged in the shell;

a circuit capable of breaking is arranged in the shell and connected to the access circuit in series;

an electromagnetic assembly and a gas discharge tube which are connected in parallel on the segmentable circuit are arranged in the shell, and a stationary contact connected with the wiring terminal is arranged on the gas discharge tube;

the lower part of the contact support is provided with a movable contact, and the contact support is operated by a closing wrench which is rotationally connected with the shell to open/close; and when the corresponding fault occurs in the access circuit, the electromagnetic assembly controls the swing fork to act to unlock the locking threshold so as to achieve the brake-off effect.

The utility model has the advantages that:

(1) the utility model discloses a contact support and pendulum fork part of design can have better combined floodgate/break-off brake effect, and compare in the mode that adopts a plurality of parts to realize among the prior art, the utility model discloses simple structure, space occupancy is lower, is fit for setting up in the miniature circuit breaker that has limitations to the volume;

(2) the utility model adopts the swing fork structure with the lever principle to lock, thereby forming a locking threshold, when the second power source receives the fault signal of the access circuit, the swing fork can be unlocked and disconnected by outputting smaller thrust, thereby not only meeting the tripping requirement, but also adopting smaller electromagnetic components, thereby providing more space utilization for the interior of the miniature circuit breaker;

(3) the utility model realizes the sliding unlocking effect between the swing fork and the push rod by having the chute structure, and the limit end arranged on the swing fork can be matched with the chute to realize the limit fixation; because the lower part of the swing fork is longer in force arm from the fulcrum, and because of the limitation of the sliding chute, only a small protruding structure is needed to form a locking threshold, and because the stroke of the protruding structure is small, the swing fork can be unlocked and quickly released only by pushing out a small distance by the electromagnetic assembly;

(4) the utility model discloses in owing to be provided with the torsional spring structure, then under the exogenic action except that the electromagnetic component moves, the pendulum fork is very difficult to be moved, and the less vibration of range can't make the unblock of only locking threshold to this tripping device has higher stability, is difficult for appearing the mistake disconnected condition.

Drawings

Fig. 1 is an overall external shaft side schematic view in embodiment 4 of the present invention;

fig. 2 is an overall external plan view in embodiment 4 of the present invention;

fig. 3 is a plan view showing an internal structure of the case of embodiment 4 of the present invention after one side of the case is removed;

fig. 4 is an enlarged schematic view of a portion of fig. 2 according to the present invention;

fig. 5 is an axial view of the embodiment 4 of the present invention in which one side of the housing is removed;

fig. 6 is an isometric view of the present invention at another angle after removing one side of the housing in embodiment 5;

fig. 7 is a schematic axial view of a trip mechanism according to embodiment 2 of the present invention;

fig. 8 is a schematic axial view of another angle of the trip mechanism of embodiment 2 of the present invention;

fig. 9 is a schematic plan view of a trip mechanism according to embodiment 2 of the present invention;

fig. 10 is a schematic plan view of a miniature circuit breaker provided with a trip mechanism according to embodiment 3 of the present invention;

fig. 11 is a schematic axial view of a miniature circuit breaker equipped with a trip mechanism according to embodiment 3 of the present invention;

fig. 12 is a schematic axial view of a trip mechanism according to embodiment 3 of the present invention;

fig. 13 is a schematic axial view of another angle of the trip mechanism according to embodiment 3 of the present invention;

fig. 14 is a state diagram of the present invention when the electromagnetic assembly pushes the fork to rotate after the operation, and it can be seen that the protruding structure of the anti-slip block is about to rotate until the locking threshold is failed;

fig. 15 is a schematic view of the middle state of the contact holder of the present invention when it starts to rotate;

fig. 16 is a schematic diagram of the closing wrench and the contact holder both returning to the initial state when the present invention is in the open state.

In the figure: 1-contact support, 2-swing fork, 3-sliding chute, 4-fulcrum, 5-anti-slip part, 6-torsion spring, 7-closing spanner, 8-push rod, 8.1-fixed part, 8.2-strip-shaped rod piece, 8.3-bending arm, 9-electromagnetic component, 10-first return spring, 11-second return spring, 12-shell, 13-gas discharge tube, 14-contact enlarged area, and 15-bending part.

Detailed Description

The present invention will be further explained with reference to the drawings and the embodiments.

In order to make the objects, 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 drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the embodiment discloses a tripping mechanism which is mainly applied to an action part for realizing switching-on/switching-off control on a circuit accessed into a miniature circuit breaker in the miniature circuit breaker.

The performance of the miniature circuit breaker is determined by three parts:

contact, arc extinguishing mechanism: the contact and the arc extinguishing mechanism determine the reliability and the operation breaking capacity when the switch is connected for long-term operation and broken.

The tripping mechanism comprises: the anti-vibration, anti-sliding and anti-tripping device mainly relates to the vibration resistance, anti-sliding and tripping force of the circuit breaker.

The electromagnetic assembly 9: that is, the electromagnet, it involves tripping efficiency, detects the stability of access circuit, and the problem that its coil generates heat, the iron core generates heat can influence above-mentioned two performance index.

Among the above three components, stability of the trip mechanism is very important, and it is a commonly adopted method at present to appropriately reduce trip sensitivity in order to improve stability. The tripping sensitivity is reduced and the tripping driving force is increased. In the case of a small current (below 5A), the number of turns of the coil of the electromagnet is increased, and the volume of the electromagnet is difficult to reduce. In addition, when the rated current is increased, the sectional area of the coil is large, the electromagnet is limited by the volume, the size of the sectional area of the coil is limited, and the problem of heating is difficult to meet. Making a circuit breaker smaller in size is a problem that is currently urgently needed to be solved.

In order to solve the above problems, the driving force of the trip mechanism needs to be reduced, and the driving force required by the trip mechanism is reduced, so that the electromagnetic size can be reduced, and the size of the circuit breaker can be reduced. Adopt threshold spout 3 locking, release mechanism in this embodiment, reduced the dropout driving force by a wide margin to dropout structural stability still can keep original level.

This embodiment specifically discloses a novel tripping device, including contact carrier 1 as major structure, this contact carrier 1 be set up in ordinary miniature circuit breaker and with miniature circuit breaker inner wall swing joint's part. The movable contact is arranged on the contact support 1 and is matched with a static contact arranged in the miniature circuit breaker to realize the effect of switching on/off.

The contact support 1 has two states, and can perform action conversion between the two states, namely a closing state and an opening state. When the switch is in a switch-on state, the movable contact and the fixed contact are in contact to realize electric conduction, and when the switch is in a switch-off state, a certain distance is formed between the movable contact and the fixed contact, so that a circuit is broken.

In order to control the directional movement of the contact carrier 1, a first power source is provided for providing a power signal to the contact carrier 1 for linkage. The first power source can provide power signals in different directions for the contact support 1 to be switched on or switched off, and can continuously provide continuous power signals or a limiting effect for the contact support 1 to keep a switched-on state when the switched-on state is achieved.

However, the miniature circuit breaker is originally a device for protecting the access circuit, and has a detection component for detecting a fault signal of the access circuit, and once a corresponding electrical fault (short circuit, electric leakage, fault arc, etc.) occurs, the corresponding component inside is controlled to operate and disconnect.

In order to realize the necessary functions, the present embodiment provides a second power source to provide an open-circuit feedback power signal, and the contact holder 1 is provided with a swing fork 2 movably connected with the contact holder 1. The structure of the pendulum fork 2 is a lever structure, and has a force amplification function. In this embodiment, the first power source transmits a power signal to the contact holder 1, and the first power source is provided with a contact end connected with the contact holder 1.

The contact end is movably connected with the contact support 1, so that a certain degree of freedom is provided, the swing fork 2 is provided with a limiting end used for limiting the contact end and forming fixed connection, and an operable locking mechanism is formed by the swing fork 2 and the contact support 1 due to the movable property of the swing fork 2.

The realization principle is as follows:

in a normal state, the second power source does not act, and the contact carrier 1 therein is in an open state, which is the initial state of the contact carrier 1. The switching-on operation is carried out by controlling the first power source to move, and at the moment, because the swing fork 2 is positioned and kept at the initial position, the first power source and the contact support 1 are limited to keep a fixed linkage relation. After the first power source acts, the contact support 1 is simultaneously linked and moves towards a closing state, and when the movable contact is in contact with and abuts against the fixed contact, the contact support 1 is kept fixed at the position.

Because the contact support 1 has a restoring force, which includes an original elastic mode or a restoring structure, the contact support 1 always has the restoring force acting towards one side of the brake, and the brake is automatically switched off as long as the contact support 1 loses the supporting force of the first power source.

In order to realize the switching-off process, namely, the contact support 1 loses power, two modes are included, wherein one mode is that the first power source is directly controlled to move towards the switching-off direction, and at the moment, the contact support 1 not only loses the switching-on power, but also moves towards the switching-off direction under the combined action of the restoring force of the contact support. The method mainly comprises the step of actively controlling the action of the first power source when the line needs to be forcibly disconnected, so that the original access circuit does not have any fault in the state and is only used as a reserved brake-off mode.

And the other one is passive action through a second power source, and when the corresponding fault occurs in the access circuit, the swing fork 2 is directly pushed or caused to act in other linkage modes. And the swing fork 2 makes the first power source and the contact support 1 lose connection after action, and the contact support 1 directly returns to the initial position by the action of restoring force to complete the brake-off process.

Example 2:

the embodiment specifically discloses a tripping mechanism applied to a miniature circuit breaker, as shown in fig. 7-9 and 14-16, which includes a contact support 1 as a main structure, wherein a movable contact is arranged on the contact support 1, and is used for cooperating with a stationary contact in the miniature circuit breaker to realize the action of opening/closing a switch.

As can be seen from the figure, the whole contact support 1 is of a rod-like structure, and the bottom of the contact support is a moving contact, and in this embodiment, the moving contact and the contact support 1 form an integrated structure design, and is connected with a connection terminal of a miniature circuit breaker through a soft wire for conduction. And whole contact carrier 1 forms the rotation connected mode that has certain degree of freedom through a spliced pole that sets up in miniature circuit breaker, so-called certain degree of freedom, mean the elliptical hole structure that is equipped with on contact carrier 1 with this spliced pole complex, owing to set up contact carrier 1 cover on this spliced pole, make the spliced pole penetrate in this elliptical hole, then contact carrier 1 not only can rotate around this spliced pole, and can follow this elliptical hole structure length direction and remove, thereby compare in ordinary rotation connected mode, it has the degree of freedom of horizontal translation.

While the entire contact carrier 1 is provided with a fork 2, the fork 2 in this embodiment is connected to the contact carrier 1 in a rotatable manner and has two typical functional ends. The lower end of the electromagnetic component is a pushing end, and a contact expanding area 14 is arranged at the pushing end, so that the electromagnetic component 9 can be conveniently matched and a larger-area acting point can be provided. The contact enlarged region 14 is shown as a rectangular plate structure in a perpendicular connection with the body of the yoke 2, i.e., at the side of the yoke 2.

And the upper side of the pendulum fork 2 close to the end part is rotatably connected with the contact support 1, and the rotating point is the fulcrum 4 of the pendulum fork 2. As can be seen, the yoke 2 is arranged on the side of the contact carrier 1 and is arranged in a flush manner, and a bend 15 is arranged on the side of the lower side of the yoke 2 opposite to the contact widening area 14, and the bend 15 is used to pull the contact carrier 1 towards the closing direction. A gap exists between the fold 15 and the contact enlargement 14, and the width of the gap is greater than the width of the contact carrier 1 located in the gap, so that the contact carrier 1 has a certain degree of freedom.

The first power source in this embodiment is a closing wrench 7 disposed in the miniature circuit breaker, and as can be seen in fig. 6, the closing wrench 7 is a circular manual component, and an end portion thereof is provided with an acting point for manual operation. And the disc surface of the closing wrench 7 is provided with a push rod 8, and as can be seen in fig. 7, the push rod 8 comprises two parts, one of which is a fixing part 8.1 provided with a rotating shaft inserted into the disc surface of the closing wrench 7 for rotating connection, and the other is a strip-shaped rod 8.2 inserted into a groove of the fixing part 8.1, and a bending arm 8.3 is arranged at the end part of the strip-shaped rod 8.2, and the bending arm 8.3 is movably connected with the contact support 1 for power transmission.

The top of the contact support 1 is provided with a sliding groove 3, the bending arm 8.3 is inserted into the sliding groove 3 to realize sliding connection, and in order to provide locking effect, a limited end of the upper part of the swing fork 2 is provided with a limited slip part 5. The anti-slip part 5 is also connected with the pendulum fork 2 in a rotating way, but the rotating range is smaller. In an initial state, the torsion spring 6 is arranged on the swing fork 2, the torsion spring 6 provides a force for the anti-slip part 5 to rotate towards the clockwise direction all the time, the anti-slip part 5 is attached to the side surface of the sliding groove 3, and a protruding structure is formed for limiting the bending arm 8.3 to slide in the sliding groove 3. As can be seen in the figure, since the bending arm 8.3 abuts against the locking threshold structure formed by the limit end of the fork 2 and the chute 3 in the initial state, the fork 2 is stressed mainly, and the fork 2 has a tendency to rotate. And the turning point of the pendulum fork 2 and the contact support 1 in the figure, that is, the force arm from the fulcrum 4 to the bending arm 8.3 is too small, and the thrust direction given by the bending arm 8.3 is close to the axis perpendicular to the fulcrum 4, so that the force applied to the pendulum fork 2 cannot directly cause the pendulum fork 2 to independently rotate, and the thrust is transmitted to the contact support 1, so that the contact support 1 rotates around the turning point, and the locking and closing effect is realized.

When the contact support 1 is switched on, the connecting column is always positioned at the right end of the elliptical hole structure due to the whole restoring force of the contact support. When the contact support 1 acts, the contact support 1 firstly moves transversely along the length direction of the elliptical hole, when the connecting column abuts against the left end part of the elliptical hole structure, the contact support 1 starts to rotate around the axis of the connecting column, and when a movable contact at the lower part is in contact with a static contact and abuts against the static contact, a closing state is achieved.

Because closing wrench 7 is the manual structural design, then when being in the combined floodgate state, can remove drive power. Due to the structural design particularity, in a closing state, three points of collinear states are formed among the rotating circle center of the closing wrench 7, the strip-shaped rod 8.2 and the contact point of the bending arm 8.3. At this time, although the driving force applied to the closing wrench 7 to rotate the closing wrench is removed, since the force direction applied to the bending arm 8.3 by the restoring force of the contact carrier 1 is exactly along the extension direction of the three collinear points, the closing wrench 7 cannot be rotated by the restoring force, and thus a static state is formed.

Because ordinary external force striking or vibrations can't destroy this static state, then have better structural stability, avoid appearing the condition of mistake disconnection. The anti-slip piece can only rotate anticlockwise by rotating the swing fork 2 structure, the formed locking threshold is invalid, the bending arm 8.3 can slide in the sliding groove 3, and the contact support 1 is restored to the initial state by relative sliding between the push rod 8 and the contact support 1. And because the rotation of the contact support 1 can cause the push rod 8 to act, the push rod 8 originally has the restoring force, but the restoring force can not force the closing wrench 7 to rotate in the closing state, and the action can be returned to the initial state only after the push rod 8 rotates to a certain angle.

The only factor directly causing the pivoting of the fork 2 to unlock is the second power source provided, in this embodiment the electromagnetic assembly 9. The electromagnetic assembly 9 is an electromagnet assembly with a yoke, inside which a movable armature rod is arranged, and the coil assembly is connected in parallel with the access circuit. When an abnormal current signal occurs in the access circuit, the coil group generates a magnetic field with certain intensity to push the armature rod piece, the extending end of the armature rod piece is just aligned with the contact expanding area 14, and the lower part of the pendulum fork 2 is pushed to enable the pendulum fork 2 to rotate anticlockwise.

At the moment, the upper part of the swing fork 2 drives the arranged anti-slip block to rotate simultaneously, so that a protruding structure which influences the sliding of the bending arm 8.3 is formed on the side surface of the sliding groove 3 to move downwards, and when the bending arm 8.3 loses contact with the protruding structure, the whole contact support 1 loses the limiting force and then rotates anticlockwise to trip.

This embodiment compares in embodiment 1 and prior art, not only can provide the little part's of a small volume tripping assembly, has higher stability, and can the rapid stabilization dropout through the locking threshold of 3 structural formations of pendulum fork 2 and spout, and the big moment bit point of pendulum fork 2 can cooperate the electromagnetic component 9 of little volume to realize stabilizing the dropout effect, and current miniature circuit breaker's installation demand is satisfied to whole structure.

Example 3:

the present embodiment is also a tripping mechanism applied in a miniature circuit breaker, as shown in fig. 10-13, and as same as the above embodiment 2, the tripping mechanism also includes a contact holder 1, where a movable contact is provided on the contact holder 1, and is used for cooperating with a stationary contact in the miniature circuit breaker to implement an opening/closing action.

The whole contact support 1 is in a rotary connection mode with a certain degree of freedom through a connecting column arranged in the miniature circuit breaker, a swing fork 2 is further arranged on the contact support 1, the swing fork 2 is in rotary connection with the contact support 1, and the contact support 1 has two typical functional end portions. The lower end of the electromagnetic component is a pushing end, and a contact expanding area 14 is arranged at the pushing end, so that the electromagnetic component 9 can be conveniently matched and a larger-area acting point can be provided.

And the upper side of the pendulum fork 2 close to the end part is rotatably connected with the contact support 1, and the rotating point is the fulcrum 4 of the pendulum fork 2. As can be seen, the yoke 2 is arranged on the side of the contact carrier 1 and is arranged in a flush manner, and a bend 15 is arranged on the side of the lower side of the yoke 2 opposite to the contact widening area 14, and the bend 15 is used to pull the contact carrier 1 towards the closing direction. A gap exists between the fold 15 and the contact enlargement 14, and the width of the gap is greater than the width of the contact carrier 1 located in the gap, so that the contact carrier 1 has a certain degree of freedom.

The pendulum fork 2 formula structure as an organic whole in this embodiment, its spacing end is outwards outstanding to form curved protruding structure be equipped with on the contact carrier 1 and give pendulum fork 2 towards forming the torsional spring 6 that the threshold direction of only locking pushed power is formed all the time.

As can be seen in fig. 12 and 13, the present embodiment has a certain difference from the fork 2 of embodiment 2. The fork 2 in embodiment 2 is a single-layer plate structure provided on the side of the contact carrier 1, which provides the side of the arrangement where the limiting effect of the bending arm 8.3 is mainly concentrated, and is also the insertion side of the bending arm 8.3. In order to provide a more balanced limiting effect in the present embodiment, the pendulum fork 2 is set to be a double-layer structure, the contact carrier 1 is set in the gap of the pendulum fork 2, and the same protruding structures are formed from both sides to limit the bending arms 8.3. From the whole stress structure, no matter the dispersion effect of restriction effect and power, all compare in embodiment 2 and have better stability, avoid leading to appearing not hard up problem because of the assembly process problem after long-time load-carrying of fork 2.

The specific operation principle and other structures of this embodiment are the same as those of embodiment 2, and therefore, detailed description thereof is omitted.

Example 4:

this embodiment specifically discloses an SCB that can be regarded as miniature circuit breaker, that is to say with surge protector complex external release, as shown in fig. 1-6, the main structure of this miniature circuit breaker is mainly shown in the above-mentioned figure. It should be noted that the connection terminal of the device is not shown in the drawings, but since a certain reserved space is provided inside the structure, the connection terminal can be adjusted and set by a person skilled in the art according to actual needs.

The miniature circuit breaker includes a housing 12 and a plurality of functional components disposed in the housing 12, and is also provided with the trip mechanism in embodiment 2.

It can be seen that the housing 12 is a two-piece snap-fit rectangular structure, and fig. 3 is an illustration of the location of the internal structure after removal of one side. Specifically, the closing wrench 7 is disposed at the top of the housing 12, the closing wrench 7 is a disc-shaped structure, and a driving lever extending out of the housing 12 for manual pushing is disposed at one side end of the closing wrench 7. The closing wrench 7 is rotatably connected to the housing 12 and has a certain rotation angle.

A cylindrical sinking groove is arranged on the disc surface of the closing wrench 7 close to the outer ring, a push rod 8 of the tripping mechanism is arranged at the position, and a rotary pump of a fixing part 8.1 is inserted into the sinking groove to be rotationally connected with the closing wrench 7. While the entire trip mechanism is disposed on the right side of the housing 12, it has fewer parts and a smaller volume than prior trip mechanisms.

And the left middle part is provided with an electromagnetic component 9 matched with the swing fork 2, and the lower part of the electromagnetic component 9 is also provided with a gas discharge tube 13. The magnet assembly 9 is connected in parallel with the gas discharge tube 13, and the gas discharge tube 13 is also connected in parallel in the connecting circuit. The right side of the gas discharge tube 13 is provided with a static contact which is matched with a movable contact at the lower part of the contact support 1 to realize the effect of switching on/off.

As can be seen in fig. 3, in contrast to the prior art and the above-described exemplary embodiment, a separate fastening post is also provided in the housing 12, on which two tension springs, namely a first return spring 10 and a second return spring 11, are provided. The first return spring 10 in the figure is connected to the mounting point on the contact carrier 1, giving the contact carrier 1 a return force that always exceeds the left turn. While the second return spring 11 is not connected to any part in the figure, which is actually indicated by the broken line in fig. 4, and is connected to a hook-shaped structure on the left side of the fixed part 8.1 of the push rod 8, thereby giving the push rod 8 a restoring force for moving towards the left side. The left fixing points of the two tension springs are fixed on the same fixing point, so that the internal structure of the shell 12 is reduced.

The present invention is not limited to the above-mentioned alternative embodiments, and various other products can be obtained by anyone under the teaching of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the following claims, and which can be used to interpret the claims.

Claims (10)

1. The utility model provides a tripping device for thereby the cooperation power supply is automatic break-brake or the manual control break-brake protection circuit that corresponds trouble appears in the access circuit, its characterized in that: the switching-on/switching-off device comprises a contact support (1) and a pendulum fork (2) arranged on the contact support (1), wherein the pendulum fork (2) is of a lever structure with a fulcrum (4), and a switching-on/switching-off circuit is switched in/out by moving the contact support (1);

when the switch is switched on, the set first power source acts and is in transmission connection with the contact support (1) under the limitation of the swing fork (2), so that the contact support (1) acts to reach a switch-on state and is kept in the switch-on state;

when the brake is broken, the second power source is arranged to push one end of the swing fork (2) far away from the fulcrum (4) to act, so that the first power source and the contact support (1) lose the limiting effect, and the contact support (1) with restoring force returns to the initial position and keeps the brake breaking state before the first power source acts.

2. A trip mechanism according to claim 1, wherein: the swing fork (2) is of a rotary rod-shaped structure, and one end of the swing fork is a limiting end which limits the transmission connection between the first power source and the contact support (1);

the other end of the driving shaft is a pushing end matched with a second power source;

the fulcrum (4) is arranged on one side close to the limiting end.

3. A trip mechanism according to claim 2, wherein: the contact support (1) is provided with a limiting structure for limiting the first power source and the contact end of the contact support (1) to move directionally, and the limiting end of the swing fork is matched with the limiting structure to form a locking threshold.

4. A trip mechanism according to claim 3, wherein: the limiting structure is a sliding groove (3) arranged on the contact support (1) or outside the contact support (1), and the contact end of the first power source extends into the sliding groove (3) and can reciprocate along the extending direction of the sliding groove (3); the connection and extraction end is abutted against any end part of the sliding groove (3) by the limiting end to realize limiting.

5. The trip mechanism of claim 4, wherein: the limiting end is a protruding structure rotating around the fulcrum (4), and the protruding structure forms a locking threshold with the width smaller than that of the sliding groove (3) on the sliding groove (3);

when the second power source pushes the swing fork (2) to rotate around the fulcrum (4), the locking threshold disappears, and the contact support (1) returns to the initial position after losing the continuous pushing force of the first power source.

6. The trip mechanism of claim 5, wherein: the limiting end of the swing fork (2) is provided with a slip stopping part (5) which is rotationally connected with the swing fork (2), and the slip stopping part (5) rotates around the fulcrum (4) to form a protruding structure.

7. The trip mechanism of claim 6, wherein: and the contact support (1) is provided with a torsion spring (6) which gives a pushing force to the anti-slip part (5) towards the direction forming the locking threshold all the time.

8. The trip mechanism of claim 5, wherein: pendulum fork (2) formula structure as an organic whole, its spacing end is outwards outstanding to form curved protruding structure be equipped with on contact carrier (1) and give pendulum fork (2) towards forming torsional spring (6) that the threshold direction of only locking is pushed all the time.

9. A trip mechanism according to any of claims 3-8, wherein: the first power source is a manually/electrically rotated closing wrench (7), the contact end is a push rod (8) rotatably arranged on the closing wrench (7), and the end part of the push rod (8) is matched with the locking threshold to be clamped and limited;

a first return spring (10) used for providing restoring force towards the brake-off direction is arranged at the end part of one side, away from the swing fork (2), of the push rod (8);

the second power source is an electromagnetic assembly (9) connected into the access circuit in parallel, and the action end of the electromagnetic assembly (9) is arranged corresponding to the pushing end of the swing fork (2);

the contact support (1) is a rotating part, the bottom of the contact support is connected with a movable contact, the movable contact is contacted with/separated from a fixed contact through the swinging of the contact support (1) to realize switching on/off, and a second reset spring (11) used for providing restoring force towards the switching off direction is arranged between the rotating point of the contact support (1) and one side close to the push rod (8).

10. A miniature circuit breaker, characterized in that: comprising a housing (12) with terminals and, in the housing (12), a trip device according to claim 9;

the shell (12) is internally provided with a circuit capable of breaking which is connected in series with the access circuit;

an electromagnetic assembly (9) and a gas discharge tube (13) which are connected in parallel on a segmentable circuit are arranged in the shell (12), and a static contact connected with a wiring terminal is arranged on the gas discharge tube (13);

the lower part of the contact support (1) is provided with a movable contact, and the contact support (1) is operated by a closing wrench (7) which is rotationally connected with the shell (12) to open/close; and when the corresponding fault occurs in the access circuit, the electromagnetic assembly (9) controls the pendulum fork (2) to act to realize unlocking of the locking threshold so as to achieve the brake-off effect.

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