CN214226849U - Time delay tripping device and circuit breaker thereof - Google Patents

Abstract

The utility model belongs to the technical field of circuit breakers, and discloses a time delay tripping mechanism and a circuit breaker thereof, wherein the time delay tripping mechanism is arranged in the circuit breaker and is matched with a tripping component in the circuit breaker to realize the time delay tripping of the circuit breaker, and comprises a bimetallic strip and a tripping rod which is rotatably arranged in the circuit breaker; the bimetallic strip is provided with a fixed end and a free end, the free end moves towards the trip rod when the bimetallic strip is heated and bent and contacts the trip rod to enable the trip rod to rotate, and the trip rod rotates to contact the trip component to break the brake. The utility model discloses a time delay structure utilizes the directional action principle of being heated of current bimetallic strip, through cooperation dropout subassembly, sets up the rotating part in the circuit breaker and realizes stabilizing the dropout action effect, utilizes the little volume characteristic of rotating part simultaneously, satisfies the installation demand of 5G circuit breaker or other little volume circuit breakers.

Description

Time delay tripping device and circuit breaker thereof

Technical Field

The utility model belongs to the technical field of the circuit breaker, concretely relates to time delay tripping device and circuit breaker thereof.

Background

The low-voltage circuit breaker is a switching device which can not only connect and disconnect normal load current and overload current, but also connect and disconnect short-circuit current. The low-voltage circuit breaker has certain protection functions such as overload, short circuit, undervoltage and leakage protection besides the function of starting control in the circuit. The low-voltage circuit breakers are classified into various types, including a selective type (adjustable parameters of a protection device) and a non-selective type (non-adjustable parameters of the protection device) according to the use category, and an air type and a vacuum type (most of the existing domestic air type) according to the arc extinguishing medium.

The core component in the circuit breaker is a tripping component or a tripping mechanism, and the structure can reliably break the circuit breaker when an access circuit fails, so that the access circuit is guaranteed. The action judgment basis of the tripping structure realizes automatic breaking by an active or passive action mode generated by current change according to the current change in the access circuit. The electromagnetic tripping is used as a main instantaneous tripping mode commonly used in the circuit breaker, and an electromagnetic coil in a series connection circuit generates corresponding action when the current changes to drive an external movable contact and a fixed contact to be separated and tripped. The thermal tripping structure is usually matched with the electromagnetic tripping structure and is used as a time delay structure to be switched off by a thermal action when short-circuit current which does not cause the electromagnetic tripping action appears in the access circuit.

However, most of thermal trip delay mechanisms in the prior art adopt a pull rod mechanism, and the pull rod mechanism not only occupies a large space, but also cannot normally reset. In the 5G circuit breaker, its casing is compared and is had great difference in current low voltage circuit breaker, has longer length and narrower width, and then inside most structure all arranges in proper order along length direction, and the installation space who leaves for hot tripping device is less, can't set up current time delay tripping device.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model provides a delay tripping structure and 5G circuit breaker adopting the same realize that the delay is stabilized disconnected through the cooperation of the electromagnetic tripping structure who sets up in suitable connection action structure and the 5G circuit breaker.

The utility model discloses the technical scheme who adopts does:

in a first aspect, the utility model discloses a time delay tripping mechanism, which is arranged in a circuit breaker and is matched with a tripping component in the circuit breaker to realize the time delay tripping of the circuit breaker, and comprises a bimetallic strip and a tripping rod which is rotatably arranged in the circuit breaker;

the bimetallic strip is provided with a fixed end and a free end, the free end moves towards the trip rod when the bimetallic strip is heated and bent and contacts the trip rod to enable the trip rod to rotate, and the trip rod rotates to contact the trip component to break the brake.

It is worth to be noted that the tripping mechanism is an actuating structure for assisting a main tripping component in the circuit breaker to trip, and the tripping component originally arranged in the circuit breaker can automatically detect the action according to the continuous current magnitude of the access to complete the brake-off action. However, generally, a main tripping assembly in the circuit breaker operates based on an electromagnetic effect generated by the magnitude of the instantaneous or continuous current in the series-connected circuit, and once the short-circuit condition occurs in the connected circuit, the continuously increased current can be tripped in time after reaching an operation threshold value. If the continuous short-circuit current does not reach the operation threshold, but the continuous short-circuit current is long, so that part of the electric equipment or the power distribution equipment generates heat and is unstable, a thermal tripping structure is further arranged in the circuit breaker in order to further improve the protection effect.

The utility model provides a time delay tripping device then belongs to a thermal trip structure equally, and wherein bimetallic strip is the combined material that comprises two or more metals or other materials that have suitable performance. Because the thermal expansion coefficients of the component layers are different, when the temperature changes, the deformation of the active layer is larger than that of the passive layer, so that the whole bimetallic strip can bend towards one side of the passive layer, and the curvature of the composite material changes, thereby generating deformation. That is, the bimetal moves to one side when heated, and forms an interlocking relationship by engaging with the trip lever.

Wherein, the bimetallic strip is the lamellar body structure, has two tip on length direction, fixes bimetallic strip one end in the circuit breaker, and fixed one side is the stiff end of bimetallic strip promptly. And the other end is positioned in the circuit breaker and has a certain free moving space, and the side is the free end of the bimetallic strip. The free end is closer to the trip bar and can be directly attached and contacted, or a certain distance is reserved between the free end and the trip bar, and the trip bar is pushed after the free end acts or is pushed in a delayed manner only by the action of the trip bar.

And the trip bar is rotatably connected with the interior of the circuit breaker, has a certain free rotation angle range, and can only rotate towards one side when being in an initial state. Meanwhile, the trip bar takes a rotating point as a reference, one end of the trip bar is close to the bimetallic strip, and the other end of the trip bar is close to the trip assembly. The circuit breaker in the embodiment has a movable contact and a fixed contact, and the tripping component can act in the circuit breaker and guide the movable contact to be in contact with or separated from the fixed contact. If regard as a part with whole dropout subassembly, then the internal stress in the dropout subassembly originally, because have combined floodgate and break off the floodgate two states in whole circuit breaker, when being in combined floodgate state, the dropout subassembly is locked, and has great internal stress this moment, in case there is external force to act on its key structure and promote certain distance, then this dropout subassembly can independently drive the dropout by the internal stress and break off the floodgate.

In combination with the first aspect, the present invention provides the first embodiment of the first aspect, wherein the trip bar is independent of the bimetallic strip for two separate parts, the trip bar is divided into the pushing section and the stressed section by using the rotation point as the reference, and the stressed section is located on the rotation track of the free end of the bimetallic strip, the rotation track is always provided with the intersecting part of the track.

It should be noted that, because the bimetal and the trip bar are two separate independent components, and the bimetal has the maximum bending amplitude (theoretically, the bimetal has a larger bending amplitude before the temperature reaches the upper limit, but in the general short-circuit condition, only the thermal trip action exists and the range value of the non-action of the electromagnetic trip component is smaller, the bending amplitude is limited by default), in the bending amplitude of the bimetal, the trip bar needs to be prevented from being disconnected from the bimetal, so that a better pushing effect can be ensured.

Because the bimetallic strip is wholly deformed when being heated, because be provided with the limit structure in the circuit breaker and fix its part, then the free end bending after being heated carries out the similar circular arc rotation with the outside of limit structure as the centre of a circle, then as long as guarantee that the free end outside can contact with the atress section of trip bar when rotating all the time, then can avoid the trip bar to have the effort of orientation antiport and resume to initial position when losing the contact with the free end.

Combine the first aspect, the utility model provides a second kind of embodiment of the first aspect, be equipped with the connecting piece between trip bar and the bimetallic strip, the connecting piece all rotates with trip bar, bimetallic strip to be connected.

It is worth mentioning that this way of connecting the two parts ensures that they are always connected, unlike separate and independent structures.

In combination with the second embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, wherein the trip lever has a reset element thereon, and the reset element provides a restoring force to the trip lever that moves toward the initial position all the time.

Combine the third embodiment of the first aspect, the utility model provides a fourth embodiment of the first aspect, be equipped with the opening on the atress section and dodge the groove towards the arc of the free end of bimetallic strip, the atress section is because the arc dodges the groove and forms the contact jaw at its tip, and this contact jaw supports all the time at the trip bar rotation in-process and leans on the free end surface at the bimetallic strip.

In a second aspect, the utility model discloses a circuit breaker, which adopts the delay tripping mechanism of the first aspect, comprising a shell, wherein one side of the length direction of the shell is provided with a plug-in wiring port, and the other side is provided with a plate plug-in wiring port;

the casing is internally provided with a strip-shaped fixing groove close to one side of the plate insertion type wiring port, and the bimetallic strip is fixed in the strip-shaped fixing groove.

Combine the second aspect, the utility model provides a first embodiment of the second aspect, still be equipped with binding post, electromagnetic component and the arc extinguishing subassembly that sets gradually on length direction in the casing, wherein electromagnetic component realizes closing a floodgate and breaking a floodgate with the cooperation linkage of dropout subassembly.

In combination with the first embodiment of the second aspect, the present invention provides the second embodiment of the second aspect, wherein the trip assembly includes a rotating handle, an adaptor and a locking mechanism, which are all rotatably connected to the housing and sequentially arranged along the length direction of the housing, and the locking mechanism includes a lock catch and a jump catch rotatably connected to the same rotating shaft;

the rotating handle is in transmission connection with the adapter piece through a first pull rod, and the adapter piece is in transmission connection with the lock catch through a second pull rod;

the lock catch is provided with a sliding groove, one end part of the second pull rod is inserted into the sliding groove and can slide along the sliding groove, the jump catch is provided with a locking end, and the locking end limits one end of the second pull rod from the side to be always located at one end part of the sliding groove to form a locking state.

Combine the second kind embodiment of second aspect, the utility model provides a third kind embodiment of second aspect, jump and detain and have the second and dodge the groove, jump the promotion section of taking off the pole and dodge groove one side edge with the second and contact.

The utility model has the advantages that:

the utility model discloses a time delay structure utilizes the directional action principle of being heated of current bimetallic strip, through cooperating the dropout subassembly, sets up rotating member in the circuit breaker and realizes stable dropout action effect, utilizes the little volume characteristic of rotating member simultaneously, satisfies the installation demand of 5G circuit breaker or other little volume circuit breakers; and then, the internal parts of the circuit breaker adopting the time delay structure are adjusted, so that the number of the parts is reduced, and stable tripping can be realized by matching with the set tripping rod.

Drawings

Fig. 1 is a schematic view of the internal plan structure of the tripping mechanism of the present invention after being installed in a circuit breaker and the circuit breaker housing is removed;

fig. 2 is an internal axial schematic view of the trip mechanism of the present invention disposed in a circuit breaker with the circuit breaker housing removed;

fig. 3 is a schematic axial view of the other angle of the inside of the trip mechanism of the present invention after it is installed in the circuit breaker and the circuit breaker housing is removed;

fig. 4 is a schematic plan view of the tripping structure of the present invention after being detached from the tripping assembly and some other related assemblies in the circuit breaker;

fig. 5 is a schematic plan view of the trip bar pivot connection point of fig. 4 moved upward toward the trip assembly in accordance with the present invention;

fig. 6 is a schematic axial view of the trip structure of the present invention after being detached from the trip assembly and some other related components of the circuit breaker;

fig. 7 is an independent schematic view of the present invention after the bimetallic strip, trip bar and trip buckle are separated, wherein the bimetallic strip and trip bar have two states of solid line and dotted line; the solid line state is a state where the bimetal strip pushes the trip lever to rotate by a certain angle after being bent, and the dotted line is a state where the two parts are in the initial state.

In the figure: the novel metal arc extinguishing device comprises a shell 1, a connecting terminal 2, an electromagnetic component 3, an arc extinguishing component 4, a rotating handle 5, a first pull rod 6, an adapter 7, a second pull rod 8, a lock catch 9, a trip catch 10, a trip rod 11 and a bimetallic strip 12.

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 delay tripping mechanism, which is arranged in a circuit breaker and is matched with a tripping assembly in the circuit breaker to realize a delay breaking effect.

Specifically, the circuit breaker in this embodiment is a low-voltage circuit breaker, and is connected in series in an external power supply circuit, and has two separated contacts, i.e., a movable contact and a stationary contact inside. Under normal state, the movable contact keeps contact with the fixed contact, namely a normally closed and switching-on state. The movable contact is linked with a tripping component arranged inside, and the tripping component can drive the movable contact to be separated from the fixed contact.

The tripping assembly comprises an action part and an actuating part, wherein the actuating part is connected into the circuit and can generate pushing force when abnormal large current occurs in the circuit, so that the action part is caused to act. The delay tripping mechanism in the embodiment does not have an independent switching-on/switching-off function, but is matched with the tripping assembly and in transmission connection with the action part, and after a certain time of continuous short-circuit current occurs, the same pushing force is generated to cause the action part to act and switch off, so that the delay function is added on the original structure.

The time delay tripping mechanism comprises a bimetallic strip 12 and a trip bar 11, as shown in fig. 5-7, wherein fig. 7 mainly shows the connection relationship of the two components in the circuit breaker, and the bimetallic strip 12 is connected with a terminal 2 at the lower end of the circuit breaker and generates heat when short-circuit current continuously occurs. In the illustration, the left side of the bimetal 12 is made of a material with a small thermal expansion coefficient, and when heated, the right side will generate a large amount of deformation, so that the whole bimetal 12 assumes the action state shown in fig. 7, i.e. rotates towards the left side.

Further, the lower side of the bimetal 12 is fixed, and a portion of the upper portion having approximately one third is not restricted, thereby forming a free end. And trip bar 11 is shown as rotating by cooperating with a rotating shaft on the inner wall of the circuit breaker. The rotating point is divided into an upper part and a lower part, the lower part is a stress section, and the upper part is a pushing section. Because the free end of the bimetal 12 can be regarded as local arc-like motion by taking the point position of losing the limit as the bending center of a circle when moving, the situation that the contact point or the contact surface is constantly changed when the bimetal moves and is transmitted with other rotating parts can occur, and the bimetal may be separated from the contact in the moving process, so that the trip rod 11 loses the thrust and is restored to the original position.

In this embodiment, in order to improve the contact stability, the force-bearing end of the lower portion of the trip lever 11 is configured in an arc-shaped structure, and the end portion thereof is located in the middle of the free end of the bimetal 12 in the stretched state, and the solid line portion in fig. 7 is the maximum rotation position, and it can be seen that the bimetal 12 still contacts with the end portion of the trip lever 11. When the free end rotates, the end face of the bimetallic strip 12 is always in contact with the end of the trip lever 11, that is, the rotating arm of the trip lever 11 is basically unchanged, so that a relatively stable pushing force is kept.

In fig. 5 and 6, two different rotation point arrangements of trip bar 11 are shown, the rotation point of trip bar 11 in fig. 5 is arranged in the middle, and in fig. 6, in order to amplify the moment by using the lever principle, the rotation point is moved up to make the pushing segment length smaller, so as to provide high release resistance of the initial trip assembly.

Example 2:

the embodiment discloses a circuit breaker, as shown in fig. 1-4, which comprises a housing 1, wherein one side of the housing 1 in the length direction is provided with a plug-in type wiring port, and the other side of the housing 1 is provided with a board-plug type wiring port; a strip-shaped fixing groove close to one side of the board-inserted wiring port is formed in the shell 1, and the bimetallic strip 12 is fixed in the strip-shaped fixing groove.

Still be equipped with binding post 2, electromagnetic component 3 and the arc extinguishing subassembly 4 that sets gradually on length direction in the casing 1, wherein electromagnetic component 3 realizes closing a floodgate and breaking a floodgate with the cooperation linkage of dropout subassembly. The tripping assembly comprises a rotating handle 5, an adapter 7 and a locking mechanism which are all rotatably connected with the shell 1 and are sequentially arranged along the length direction of the shell 1, and the locking mechanism comprises a lock catch 9 and a jump buckle 10 which are rotatably connected on the same rotating shaft; wherein the rotating handle 5 is in transmission connection with the adaptor 7 through a first pull rod 6 arranged, and the adaptor 7 is in transmission connection with the lock catch 9 through a second pull rod 8 arranged.

The lock catch 9 is provided with a sliding groove, one end part of the second pull rod 8 is inserted into the sliding groove and can slide along the sliding groove, the jump buckle 10 is provided with a locking end, and the locking end limits one end of the second pull rod 8 to be always located at one end part of the sliding groove from the side face to form a locking state. The jump buckle 10 is provided with a second avoidance groove, and the pushing section of the jump rod 11 is contacted with one side edge of the second avoidance groove.

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 (9)

1. The utility model provides a time delay tripping device, sets up in the circuit breaker with the cooperation of the dropout subassembly in the circuit breaker realize circuit breaker time delay dropout, its characterized in that: comprises a bimetallic strip (12) and a trip bar (11) which is rotatably arranged in the circuit breaker;

the bimetallic strip (12) is provided with a fixed end and a free end, the free end acts towards the trip rod (11) when the bimetallic strip (12) is heated and bent and contacts the trip rod (11) to enable the trip rod to rotate, and the trip rod (11) rotates to contact the trip component to break.

2. The delayed release mechanism of claim 1, wherein: the trip bar (11) and the bimetallic strip (12) are separated into two independent parts, wherein the trip bar (11) is divided into a pushing section and a stress section by taking a rotating point as a reference, and the stress section always has a part intersected with a track on the rotating track of the outermost end of the free end of the bimetallic strip (12).

3. The delayed release mechanism of claim 1, wherein: and a connecting piece is arranged between the trip bar (11) and the bimetallic strip (12), and the connecting piece is rotationally connected with the trip bar (11) and the bimetallic strip (12).

4. The delayed release mechanism of claim 2, wherein: the trip lever (11) is provided with a reset piece, and the reset piece provides a restoring force for the trip lever (11) to move towards the initial position all the time.

5. The delayed release mechanism of claim 4, wherein: the stress section is provided with an arc-shaped avoiding groove with an opening facing the free end of the bimetallic strip (12), the stress section forms a contact end at the end part of the stress section due to the arc-shaped avoiding groove, and the contact end always abuts against the surface of the free end of the bimetallic strip (12) in the rotation process of the trip rod (11).

6. A circuit breaker, characterized by: the time delay tripping mechanism of any one of the claims 1 to 5 is adopted, and comprises a shell (1), wherein one side of the length direction of the shell (1) is provided with an inserted wiring port, and the other side of the length direction of the shell is provided with a plate-inserted wiring port;

a strip-shaped fixing groove close to one side of the board-inserted wiring port is formed in the shell (1), and the bimetallic strip (12) is fixed in the strip-shaped fixing groove.

7. A circuit breaker according to claim 6, wherein: still be equipped with binding post (2), electromagnetic component (3) and arc extinguishing subassembly (4) that set gradually on length direction in casing (1), wherein electromagnetic component (3) and the cooperation linkage of dropout subassembly realize closing a floodgate and breaking a floodgate.

8. A circuit breaker according to claim 7, wherein: the tripping assembly comprises a rotating handle (5), an adapter (7) and a locking mechanism which are all rotatably connected with the shell (1) and are sequentially arranged along the length direction of the shell (1), and the locking mechanism comprises a lock catch (9) and a jump buckle (10) which are rotatably connected on the same rotating shaft;

the handle (5) is in transmission connection with the adaptor (7) through a first pull rod (6) which is arranged, and the adaptor (7) is in transmission connection with the lock catch (9) through a second pull rod (8) which is arranged;

the lock catch (9) is provided with a sliding groove, one end part of the second pull rod (8) is inserted into the sliding groove and can slide along the sliding groove, the jump buckle (10) is provided with a locking end, and the locking end limits one end of the second pull rod (8) to be always located at one end part of the sliding groove from the side face to form a locking state.

9. A circuit breaker according to claim 8, wherein: and a second avoidance groove is formed in the jump buckle (10), and the pushing section of the jump rod (11) is in contact with one side edge of the second avoidance groove.

Images